WorldWideScience

Sample records for source-region emp parameters

  1. Nuclear EMP: key suppression device parameters for EMP hardening

    International Nuclear Information System (INIS)

    Durgin, D.L.; Brown, R.M.

    1975-03-01

    The electrical transients induced by EMP exhibit unique characteristics which differ considerably from transients associated with other phenomena such as lightning, switching, and circuit malfunctions. The suppression techniques developed to handle more common transients, though not necessarily the same devices, can be used for EMP damage protection. The suppression devices used for circuit level EMP protection are referred to as Terminal Protection Devices (TPD). Little detailed data describing the response of TPD's to EMP-related transients have been published. While most vendors publish specifications for TPD performance, there is little standardization of parameters and TPD response models are not available. This lack of parameter standardization has resulted in a proliferation of test data that is sometimes conflicting and often not directly comparable. This paper derives and/or defines a consistent set of parameters based on EMP circuit hardening requirements and on measurable component parameters and is concerned only with use of TPD's to prevent permanent damage. Three sets of parameters pertaining to pertinent TPD functional characteristics were defined as follows: standby parameters, protection parameters, and failure parameters. These parameters are used to evaluate a representative sample of TPD's and the results are presented in matrix form to facilitate the selection of devices for specific hardening problems

  2. Linking source region and ocean wave parameters with the observed primary microseismic noise

    Science.gov (United States)

    Juretzek, C.; Hadziioannou, C.

    2017-12-01

    In previous studies, the contribution of Love waves to the primary microseismic noise field was found to be comparable to those of Rayleigh waves. However, so far only few studies analysed both wave types present in this microseismic noise band, which is known to be generated in shallow water and the theoretical understanding has mainly evolved for Rayleigh waves only. Here, we study the relevance of different source region parameters on the observed primary microseismic noise levels of Love and Rayleigh waves simultaneously. By means of beamforming and correlation of seismic noise amplitudes with ocean wave heights in the period band between 12 and 15 s, we analysed how source areas of both wave types compare with each other around Europe. The generation effectivity in different source regions was compared to ocean wave heights, peak ocean gravity wave propagation direction and bathymetry. Observed Love wave noise amplitudes correlate comparably well with near coastal ocean wave parameters as Rayleigh waves. Some coastal regions serve as especially effective sources for one or the other wave type. These coincide not only with locations of high wave heights but also with complex bathymetry. Further, Rayleigh and Love wave noise amplitudes seem to depend equally on the local ocean wave heights, which is an indication for a coupled variation with swell height during the generation of both wave types. However, the wave-type ratio varies directionally. This observation likely hints towards a spatially varying importance of different source mechanisms or structural influences. Further, the wave-type ratio is modulated depending on peak ocean wave propagation directions which could indicate a variation of different source mechanism strengths but also hints towards an imprint of an effective source radiation pattern. This emphasizes that the inclusion of both wave types may provide more constraints for the understanding of acting generation mechanisms.

  3. EMP Fusion

    OpenAIRE

    KUNTAY, Isık

    2010-01-01

    This paper introduces a novel fusion scheme, called EMP Fusion, which has the promise of achieving breakeven and realizing commercial fusion power. The method is based on harnessing the power of an electromagnetic pulse generated by the now well-developed flux compression technology. The electromagnetic pulse acts as a means of both heating up the plasma and confining the plasma, eliminating intermediate steps. The EMP Fusion device is simpler compared to other fusion devices and this reduces...

  4. Nuclear EMP simulation for large-scale urban environments. FDTD for electrically large problems.

    Energy Technology Data Exchange (ETDEWEB)

    Smith, William S. [Los Alamos National Laboratory; Bull, Jeffrey S. [Los Alamos National Laboratory; Wilcox, Trevor [Los Alamos National Laboratory; Bos, Randall J. [Los Alamos National Laboratory; Shao, Xuan-Min [Los Alamos National Laboratory; Goorley, John T. [Los Alamos National Laboratory; Costigan, Keeley R. [Los Alamos National Laboratory

    2012-08-13

    In case of a terrorist nuclear attack in a metropolitan area, EMP measurement could provide: (1) a prompt confirmation of the nature of the explosion (chemical or nuclear) for emergency response; and (2) and characterization parameters of the device (reaction history, yield) for technical forensics. However, urban environment could affect the fidelity of the prompt EMP measurement (as well as all other types of prompt measurement): (1) Nuclear EMP wavefront would no longer be coherent, due to incoherent production, attenuation, and propagation of gamma and electrons; and (2) EMP propagation from source region outward would undergo complicated transmission, reflection, and diffraction processes. EMP simulation for electrically-large urban environment: (1) Coupled MCNP/FDTD (Finite-difference time domain Maxwell solver) approach; and (2) FDTD tends to be limited to problems that are not 'too' large compared to the wavelengths of interest because of numerical dispersion and anisotropy. We use a higher-order low-dispersion, isotropic FDTD algorithm for EMP propagation.

  5. Nuclear EMP induced chaos

    International Nuclear Information System (INIS)

    Dance, B.

    1983-01-01

    It is anticipated that a single nuclear explosion, of adequate size, on the outside of the atmosphere would generate a pulse of sufficient intensity to damage communications equipment (including telephones, radio transmitters and receivers), and to disrupt main power supplies. This damage could be done by a very intense, short duration electro-magnetic pulse (EMP). The article discusses the generation and history of EMP, the test facilities that are needed for EMP test, and techniques that can be used to harden equipment against EMP. It is also important to protect extensive systems against EMP. The article points out that fibre-optics are very useful, because they are EMP resistant and a single fibre can also carry a very high data rate

  6. Experimental investigation on EMP effect of SRAM

    International Nuclear Information System (INIS)

    Han Jun; Xie Yanzhao; Zhai Aibin; Yao Zhibin

    2010-01-01

    The response of SRAM with different memory size at different read/write state was studied under EMP environment with pulse width of 50 ns, 350 ns and 1μs.The electric field amplitude of EMP ranges from 2.5 to 40 kV/m. It was found that the upset number has no obvious relation with memory size of SRAM and band width of EMP. The electric field amplitude is the crucial parameter leading to the upset effects. Further more, the upset effects of SRAM at read write state was much more seriously compared to the SRAM was not at read/write state. (authors)

  7. Comparative EMP design practices

    International Nuclear Information System (INIS)

    Martin, L.C.

    1975-01-01

    A large amount of effort is devoted to the hardening of systems against various effects. The nuclear electromagnetic pulse (EMP) creates potentially severe protection problems in hardening against electromagnetic effects. Each hardening effort is usually supported through development or application of sets of rules, practices, constraints, etc., which aid in decision-making throughout the design process. Several excerpts from a few sets of EMP design rules and practices taken from relatively independent sources are presented for comparison of essential features and mode of expression. A general objective is to clarify some of the EMP practices present in general EMC work and to encourage further interchange of relevant information. (auth)

  8. EMP protection technology interchange

    International Nuclear Information System (INIS)

    Martin, L.C.

    1977-01-01

    Investigation and assessment of the potential degrading and destructive effects associated with the nuclear electromagnetic (EMP) phenomena has created a large technological base. This base is indeed quite broad owing to the unique and system-pervasive character of the EMP. One of the aims of an emerging discipline, such as that associated with EMP, is to provide for adequate transfer and integration of the developing technology into the overall engineering community. The needs of the community and how EMP hardening and protection information can be transferred or exchanged are reviewed. Many of the current and generally available sources of information are listed, examples of interchange methods are provided, and problems of developing specifications, standards, and suitable guidelines for design and incorporation of protection are also discussed

  9. EMP coupling to ships

    International Nuclear Information System (INIS)

    Deadrick, F.J.; Cabayan, H.S.; Kunz, K.F.; Bevensee, R.M.; Martin, L.C.; Egbert, R.W.

    1980-01-01

    Scale-model tests were conducted to establish the adequacy and limitations of model measurements as tools for predicting electromagnetic pulse (EMP) coupling voltages and currents to the critical antennas, cables, and metallic structures on ships. The scale-model predictions are compared with the results of the full-scale EMP simulation test of the Canadian ASW ship, HMCS Huron. (The EMP coupling predictions in this report were made without prior knowledge of the results of the data from the HMCS Huron tests.) This report establishes that the scale-model tests in conjunction with the data base from EMP coupling modules provides the necessary information for source model development and permits effective, low-cost study of particular system configurations. 184 figures, 9 tables

  10. Tracing meteorite source regions through asteroid spectroscopy

    Science.gov (United States)

    Thomas, Cristina Ana

    By virtue of their landing on Earth, meteorites reside in near-Earth object (NEO) orbits prior to their arrival. Thus the population of observable NEOs, in principle, gives the best representation of meteorite source bodies. By linking meteorites to NEOs, and linking NEOs to their most likely main-belt source locations, we seek to gain insight into the original solar system formation locations for different meteorite classes. To forge the first link between meteorites and NEOs, we have developed a three dimensional method for quantitative comparisons between laboratory measurements of meteorites and telescopic measurements of near-Earth objects. We utilize meteorite spectra from the Reflectance Experiment Laboratory (RELAB) database and NEO data from the SpeX instrument on the NASA Infrared Telescope Facility (IRTF). Using the Modified Gaussian Model (MGM) as a mathematical tool, we treat asteroid and meteorite spectra identically in the calculation of 1-micron and 2-micron geometric band centers and their band area ratios (BARs). Using these identical numerical parameters we quantitatively compare the spectral properties of S-, Sq-, Q- and V-type NEOs with the spectral properties of the meteorites in the H, L, LL and HED meteorite classes. For each NEO spectrum, we assign a set of probabilities for it being related to each of these meteorite classes. Our NEO- meteorite correlation probabilities are then convolved with NEO-source region probabilities to yield a final set of meteorite-source region correlations. An apparent (significant at the 2.1-sigma level) source region signature is found for the H chondrites to be preferentially delivered to the inner solar system through the 3:1 mean motion resonance. A 3:1 resonance H chondrite source region is consistent with the short cosmic ray exposure ages known for H chondrites. The spectroscopy of asteroids is subject to several sources of inherent error. The source region model used a variety of S-type spectra without

  11. Nuclear EMP induced chaos

    Energy Technology Data Exchange (ETDEWEB)

    Dance, B

    1983-08-01

    In the event of nuclear war, the availability of first class communications facilities and of reliable electricity supplies would be of absolutely vital importance to any of the population surviving the first onslaught not only for their own welfare, but also for the preservation of their nation's retaliation deterrent capability. However, it is to be expected that a single nuclear explosion of adequate size on the outside of the atmosphere would generate a pulse of sufficient intensity to damage communications equipment (including telephones, radio transmitters and receivers) and to interrupt main supplies. The situation caused by electromagnetic pulses (EMP) is discussed.

  12. Source Region Identification Using Kernel Smoothing

    Science.gov (United States)

    As described in this paper, Nonparametric Wind Regression is a source-to-receptor source apportionment model that can be used to identify and quantify the impact of possible source regions of pollutants as defined by wind direction sectors. It is described in detail with an exam...

  13. Nuclear EMP: ingredients of an EMP protection engineering methodology

    International Nuclear Information System (INIS)

    Latorre, V.R.; Spogen, L.R. Jr.

    1977-02-01

    A fundamental methodology of electromagnetic pulse (EMP) protection engineering is described. Operations performed within the framework of this methodology are discussed. These operations, along with problem constraints and data, constitute the essential ingredients needed to implement the overall engineering methodology. Basic definitions and descriptions of these essential ingredients are provided. The issues discussed represent the first step in developing a methodology for protecting systems against EMP effects

  14. Source region of aurora kilometric radiation

    International Nuclear Information System (INIS)

    Morioka, Akira; Oya, Hiroshi; Tokumaru, Munetoshi

    1981-01-01

    This paper discusses the source region of aurora kilometric radiation (AKR), and the relation between the particle acceleration region and the polar ionosphere. The observation was made by the satellite 'Jikiken'. The AKR can be transferred to Jikiken without any interception, when the magnetic latitude of the apogee of the satellite is low. The spectra taken in June, 1980, were analyzed. The observed spectra showed the source regions of the AKR were in the aurora bands of the north and south poles. One example showed that the 200 kHz component of AKR from both poles showed the similar behavior, and another example showed that the AKR spectra from both poles showed different behavior. The altitude distribution of source regions was able to be obtained. The altitude of AKR-A was in the range between 6200 and 12000 km, and that of AKR-B was in the range of 3500 and 5200 km. The source of AKR-A was identified as that in the south hemisphere, and that of AKR-B in the north hemisphere. The asymmetric spectra of AKR-A and B showed that the spread and intensity of the electric field along magnetic lines generated above the polar ionosphere were related with the conditions of the ionosphere. (Kato, T.)

  15. Principles and techniques of radiation hardening. Volume 3. Electromagnetic pulse (EMP) and system generated EMP

    International Nuclear Information System (INIS)

    Rudie, N.J.

    1976-01-01

    The three-volume book is intended to serve as a review of the effects of thermonuclear explosion induced radiation (x-rays, gamma rays, and beta particles) and the resulting electromagnetic pulse (EMP). Volume 3 deals with the following topics: selected fundamentals of electromagnetic theory; EMP induced currents on antennas and cables; the EMP response of electronics; EMP hardening; EMP testing; injection currents; internal electromagnetic pulse (IEMP); replacement currents; and system generated electromagnetic pulse (SGEMP) hardening

  16. Bioelectromagnetic effects of EMP: Preliminary findings

    Science.gov (United States)

    Aldrich, T. E.; Easterly, C. E.; Gailey, P. C.; Hamilton, C. B.

    1988-06-01

    Facilities to simulate electromagnetic pulses (EMPs) are used to test military equipment and electrical communications devices for resistance to the effects of an EMP caused by an upper-atmospheric nuclear detonation. The rapid rise time and high field strengths (0.1 to 50 kV/m) of an EMP distinguish it from other electromagnetic phenomena. Certain types of EMP simulators also expose facility operators and members of the public to electromagnetic fields of varying intensity as do other natural sources such as the fields produced near a lightning bolt. Limited biological effects data have been collected to assess the potential EMP health hazards to humans. Evidence from the available database does not establish that EMPs represent either an occupational or a public health hazard. A critique is presented of the EMP research published to date in order to explore its limitations and similarities with related outcome experience from other electromagnetic field research. Laboratory research and multiple years of observations on workers in existing EMP manufacturing and simulation facilities suggest that there are no acute or short-term health effects. The occupational exposure guideline for EMP is 100 kV/m, which is far in excess of usual exposures with EMP simulators.

  17. Power system EMP protection. Final report

    International Nuclear Information System (INIS)

    Marable, J.H.; Barnes, P.R.; Nelson, D.B.

    1975-05-01

    Voltage transients induced in electric power lines and control circuits by the electromagnetic pulse (EMP) from high-altitude nuclear detonations may cause widespread power failure and damage in electric power systems. This report contains a parametric study of EMP power line surges and discusses protective measures to minimize their effects. Since EMP surges have considerably greater rates of rise than lightning surges, recommended standards and test procedures are given to assure that surge arresters protect equipment from damage by EMP. Expected disturbances and damage to power systems are reviewed, and actions are presented which distribution companies can take to counter them. These include backup communications methods, stockpiling of vulnerable parts, repair procedures, and dispatcher actions to prevent blackout from EMP-caused instabilities. A long-range program is presented for improving distributors' protection against EMP. This involves employee training, hardware protection for power and control circuits, and improvement of plans for emergency action. (U.S.)

  18. Probabilistic approach to EMP assessment

    International Nuclear Information System (INIS)

    Bevensee, R.M.; Cabayan, H.S.; Deadrick, F.J.; Martin, L.C.; Mensing, R.W.

    1980-09-01

    The development of nuclear EMP hardness requirements must account for uncertainties in the environment, in interaction and coupling, and in the susceptibility of subsystems and components. Typical uncertainties of the last two kinds are briefly summarized, and an assessment methodology is outlined, based on a probabilistic approach that encompasses the basic concepts of reliability. It is suggested that statements of survivability be made compatible with system reliability. Validation of the approach taken for simple antenna/circuit systems is performed with experiments and calculations that involve a Transient Electromagnetic Range, numerical antenna modeling, separate device failure data, and a failure analysis computer program

  19. EMP at the Non-Proliferation Experiment

    Energy Technology Data Exchange (ETDEWEB)

    Bell, J. [AWE, Aldermaston (United Kingdom)

    1994-12-31

    This experiment presented an opportunity to field customized equipment designed to detect and record electromagnetic pulse (EMP) emanations from an explosion over a wide frequency range. Any data recorded could be used in conjunction with the seismic methods to further non-proliferation studies. No EMP emanations were detectable from the four sensors deployed outside the tunnel confines.

  20. Nuclear magnetohydrodynamic EMP, solar storms, and substorms

    International Nuclear Information System (INIS)

    Rabinowitz, M.; Meliopoulous, A.P.S.; Glytsis, E.N.

    1992-01-01

    In addition to a fast electromagnetic pulse (EMP), a high altitude nuclear burst produces a relatively slow magnetohydrodynamic EMP (MHD EMP), whose effects are like those from solar storm geomagnetically induced currents (SS-GIC). The MHD EMP electric field E approx-lt 10 - 1 V/m and lasts approx-lt 10 2 sec, whereas for solar storms E approx-gt 10 - 2 V/m and lasts approx-gt 10 3 sec. Although the solar storm electric field is lower than MHD EMP, the solar storm effects are generally greater due to their much longer duration. Substorms produce much smaller effects than SS-GIC, but occur much more frequently. This paper describes the physics of such geomagnetic disturbances and analyzes their effects

  1. Efficient process migration in the EMPS multiprocessor system

    NARCIS (Netherlands)

    van Dijk, G.J.W.; Gils, van M.J.

    1992-01-01

    The process migration facility in the Eindhoven multiprocessor system (EMPS) is presented. In the EMPS system, mailboxes are used for interprocess communication. These mailboxes provide transparency of location for communicating processes. The major advantages of mailbox communication in the EMPS

  2. Basalts as probes of planetary interiors: constraints on the chemistry and mineralogy of their source regions

    International Nuclear Information System (INIS)

    Bence, A.E.; Grove, T.L.; Papike, J.J.

    1980-01-01

    Basalt magmas, derived by the partial melting of planetary interiors, have compositions that reflect the pre-accretionary history of the material from which the planet formed, the planets, subsequent evolutionary history, the chemistry and mineralogy of the source regions, and the intensive thermodynamic parameters operating at the source and emplacement sites. Studies of basalt suites from the Earth, its Moon, and the eucrite parent body reveal compositional differences intrinsic to their source regions which are, in turn, a characteristic of the planet and its formational and evolutionary history. (Auth.)

  3. Endothelial microparticles (EMP in physiology and pathology

    Directory of Open Access Journals (Sweden)

    Ewa Sierko

    2015-08-01

    Full Text Available Endothelial microparticles (EMP are released from endothelial cells (ECs in the process of activation and/or apoptosis. They harbor adhesive molecules, enzymes, receptors and cytoplasmic structures and express a wide range of various constitutive antigens, typical for ECs, at their surface. Under physiological conditions the concentration of EMP in the blood is clinically insignificant. However, it was reported that under pathological conditions EMP concentration in the blood might slightly increase and contribute to blood coagulation, angiogenesis and inflammation. It has been shown that EMP directly and indirectly contribute to the activation of blood coagulation. Endothelial microparticles directly participate in blood coagulation through their surface tissue factor (TF – a major initiator of blood coagulation. Furthermore, EMP exhibit procoagulant potential via expression of negatively charged phospholipids at their surface, which may promote assembly of coagulation enzymes (TF/VII, tenases and prothrombinase complexes, leading to thrombus formation. In addition, they provide a binding surface for coagulation factors: IXa, VIII, Va and IIa. Moreover, it is possible that EMP transfer TF from TF-bearing EMP to activated platelets and monocytes by binding them through adhesion molecules. Also, EMP express von Willebrand factor, which may facilitate platelet aggregation. Apart from their procoagulant properties, it was demonstrated that EMP may express adhesive molecules and metalloproteinases (MMP-2, MMP-9 at their surface and release growth factors, which may contribute to angiogenesis. Additionally, surface presence of C3 and C4 – components of the classical pathway – suggests pro-inflammatory properties of these structures. This article contains a summary of available data on the biology and pathophysiology of endothelial microparticles and their potential role in blood coagulation, angiogenesis and inflammation.

  4. observaciones empíricas

    Directory of Open Access Journals (Sweden)

    Beatriz González Vázquez

    2007-01-01

    Full Text Available En el desarrollo y éxito de los espacios innovadores las relaciones entre los agentes integrantes de los mismos resultan esenciales. En este artículo se analizan las redes de relaciones en varias áreas tecnológicas, con el objetivo de comprobar si existe un mismo modelo en todas ellas. La red en dichos espacios se estudia tanto desde una perspectiva reticular, apoyándose en los atributos de las empresas y en las variables relacionales extraídas de los flujos entre las mismas, como desde la búsqueda de un modelo cuantitativo explicativo. El análisis empírico se realiza en las redes de tres Parques Tecnológicos, y de los resultados se extrae que la morfología de la red está influenciada por la estrategia de crecimiento que haya mantenido la dirección del parque en función de las condiciones industriales de su área geográfica. El análisis cuantitativo confirma el modelo centro-periferia observado en las redes.

  5. Glacial Fluctuation in the Source Region of the Yangtze River

    International Nuclear Information System (INIS)

    Shengyi, Gao; Qingsong, Fan; Xi, Cao; Li, Ma

    2014-01-01

    Glaciers in the source region of the Yangtze River are not only water resources but also important energy and environmental resources. Glacial fluctuation is an important component of the study of changes in the natural environment, including climate change. We investigated the glaciers in the source region of the Yangtze River, and analyzed the fluctuations using multi-temporal remote sensing data. The trend in glacial fluctuation and the factors that influence it were determined. The results have implications for water resource management and environmental conservation in the Yangtze River region

  6. Electromagnetic pulse (EMP) survey of the Idaho State Emergency Operating Center, Boise, Idaho

    Energy Technology Data Exchange (ETDEWEB)

    Crutcher, R.I.; Buchanan, M.E.; Jones, R.W.

    1992-02-01

    The purpose of this report is to develop an engineering design package to protect the Federal Emergency Management Agency (FEMA) National Radio System (FNARS) facilities from the effects of high- altitude electromagnetic pulses (HEMPs). This report was developed specifically for the Idaho State Emergency Operating Center (EOC) in Boise, Idaho. It is highly probable that there will be a heavy dependence upon high-frequency (hf) radio communications for long- haul communications following a nuclear attack on the continental United States, should one occur. To maintain the viability of the FEMA hf radio network during such a situation, steps must be taken to protect the FNARS facilities against the effects of HEMP that are likely to be created in a nuclear confrontation. The solution must than be to reduce HEMP-induced stresses on the system by means of tailored retrofit hardening measures using commercial protection devices when available. It is the intent of this report to define the particular hardening measures that will minimize the susceptibility of system components to HEMP effects. To the extent economically viable, protective actions have been recommended for implementation, along with necessary changes or additions, during the period of the FNARS upgrade program. This report addresses electromagnetic pulse (EMP) effects only and disregards any condition in which radiation effects may be a factor. It has been established that, except for the source region of a surface burst, EMP effects of high-altitude bursts are more severe than comparable detonations in either air or surface regions. Any system hardened to withstand the more extreme EMP environment will survive the less severe EMP conditions. The threatening environment will therefore be limited to HEMP situations.

  7. 78 FR 35073 - Compass Efficient Model Portfolios, LLC and Compass EMP Funds Trust; Notice of Application

    Science.gov (United States)

    2013-06-11

    ... Balanced Fund, Compass EMP Multi-Asset Growth Fund, Compass EMP Alternative Strategies Fund, Compass EMP Balanced Volatility Weighted Fund, Compass EMP Growth Volatility Weighted Fund, and Compass EMP... Efficient Model Portfolios, LLC and Compass EMP Funds Trust; Notice of Application June 4, 2013. AGENCY...

  8. Effects of nuclear electromagnetic pulse (EMP) on nuclear power plants

    International Nuclear Information System (INIS)

    Barnes, P.R.; Manweiler, R.W.; Davis, R.R.

    1977-09-01

    The electromagnetic pulse (EMP) from a high-altitude nuclear detonation consists of a transient pulse of high intensity electromagnetic fields. These intense fields induce current and voltage transients in electrical conductors. Although most nuclear power plant cables are not directly exposed to these fields, the attenuated EMP fields that propagate into the plant will couple some EMP energy to these cables. The report predicts the probable effects of the EMP transients that could be induced in critical circuits of safety-related systems. It was found that the most likely consequence of EMP for nuclear plants is an unscheduled shutdown. EMP could prolong the shutdown period by the unnecessary actuation of certain safety systems. In general, EMP could be a nuisance to nuclear power plants, but it is not considered a serious threat to plant safety

  9. Drive Current Enhancement in TFET by Dual Source Region

    Directory of Open Access Journals (Sweden)

    Zhi Jiang

    2015-01-01

    Full Text Available This paper presents tunneling field-effect transistor (TFET with dual source regions. It explores the physics of drive current enhancement. The novel approach of dual source provides an effective technique for enhancing the drive current. It is found that this structure can offer four tunneling junctions by increasing a source region. Meanwhile, the dual source structure does not influence the excellent features of threshold slope (SS of TFET. The number of the electrons and holes would be doubled by going through the tunneling junctions on the original basis. The overlap length of gate-source is also studied. The dependence of gate-drain capacitance Cgd and gate-source capacitance Cgs on gate-to-source voltage Vgs and drain-to-source voltage Vds was further investigated. There are simulation setups and methodology used for the dual source TFET (DS-TFET assessment, including delay time, total energy per operation, and energy-delay product. It is confirmed that the proposed TFET has strong potentials for VLSI.

  10. EMP/GMD Phase 0 Report, A Review of EMP Hazard Environments and Impacts

    Energy Technology Data Exchange (ETDEWEB)

    Rivera, Michael Kelly [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Backhaus, Scott N. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Woodroffe, Jesse Richard [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Henderson, Michael Gerard [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Bos, Randall J. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nelson, Eric Michael [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Kelic, Andjelka [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2016-11-01

    The purpose of this study is to determine methods to analyze the hazard environments, impacts, and consequences of different sources of electromagnetic pulse (EMP), including nuclear electromagnetic pulse (NEMP) and geomagnetic disturbance (GMD) on the U.S. electric power infrastructures and to use those methods to determine EMP and GMD events of concern. The study will be carried out in four phases, each of which will provide higher levels of analytic fidelity that focuses on those EMP/GMD sources and events that create significant consequences, or whose consequences are sufficiently uncertain, to require more in-depth study. This study will leverage the best experimental data; device, equipment and system models; and simulation tools currently available. This study focuses primarily on the bulk electric system (BES) including large generating stations, large power transformers, the transmission network, and transmission system protection. Electrical distribution systems may potentially be included, if warranted, after consideration of the consequences for the bulk power system.

  11. Viking observations at the source region of auroral kilometric radiation

    International Nuclear Information System (INIS)

    Bahnsen, A.; Jespersen, M.; Ungstrup, E.; Pedersen, B.M.; Eliasson, L.; Murphree, J.S.; Elphinstone, R.D.; Blomberg, L.; Holmgren, G.; Zanetti, L.J.

    1989-01-01

    The orbit of the Swedish satellite Viking was optimized for in situ observations of auroral particle acceleration and related phenomena. In a large number of the orbits, auroral kilometric radiation (AKR) was observed, and in approximately 35 orbits the satellite passed through AKR source regions as evidenced by very strong signals at the local electron cyclotron frequency f ce . These sources were found at the poleward edge of the auroral oval at altitudes, from 5,000 to 8,000 km, predominantly in the evening sector. The strong AKR signal has a sharp low-frequency cutoff at or very close to f ce in the source. In addition to AKR, strong broadband electrostatic noise is measured during the source crossings. Energetic (1-15 keV) electrons are always present at and around the AKR sources. Upward directed ion beams of several keV are closely correlated with the source as are strong and variable electric fields, indicating that a region of upward pointing electric field below the observation point is a necessary condition for AKR generation. The plasma density is measured by three independent experiments and it is generally found that the density is low across the whole auroral oval. For some source crossings the three methods agree and show a density depletion (but not always confined to the source region itself), but in many cases the three measurements do not yield consistent results. The magnetic projection of the satellite passes through auroral forms during the source crossings, and the strongest AKR events seem to be connected with kinks in an arc or more complicated structures

  12. An overview of EMP effects and their control

    Science.gov (United States)

    Culligan, A. J.

    1985-09-01

    The environments associated with a nuclear detonation are probably the most extreme of all the environments to which an electronic equipment system may be exposed. One of these environments is related to the electromagnetic pulse (EMP) which represents an intense pulse of radiated electromagnetic energy. The endo-atmospheric EMP is generally not considered a major threat in comparison with other nuclear weapon effects related to blast, thermal phenomena, neutrons, and gamma rays. The situation is different with respect to the exo-atmospheric EMP which has the potential to simultaneously damage communication and allied networks over many thousands of square miles. The present paper is concerned with these EMP effects and the possibilities for protecting equipment from EMP. For such a protection, an understanding of the system's electronic topology is essential, and component/circuit susceptibility levels must be specified. Attention is given to the wire grid model of a strike aircraft, and the simulation of the EMP environment.

  13. Modeling the explosion-source region: An overview

    International Nuclear Information System (INIS)

    Glenn, L.A.

    1993-01-01

    The explosion-source region is defined as the region surrounding an underground explosion that cannot be described by elastic or anelastic theory. This region extends typically to ranges up to 1 km/(kt) 1/3 but for some purposes, such as yield estimation via hydrodynamic means (CORRTEX and HYDRO PLUS), the maximum range of interest is less by an order of magnitude. For the simulation or analysis of seismic signals, however, what is required is the time resolved motion and stress state at the inelastic boundary. Various analytic approximations have been made for these boundary conditions, but since they rely on near-field empirical data they cannot be expected to reliably extrapolate to different explosion sites. More important, without some knowledge of the initial energy density and the characteristics of the medium immediately surrounding the explosion, these simplified models are unable to distinguish chemical from nuclear explosions, identify cavity decoupling, or account for such phenomena as anomalous dissipation via pore collapse

  14. Input for seismic hazard assessment using Vrancea seismic source region

    International Nuclear Information System (INIS)

    Ivan, Iren-Adelina; Enescu, B.D.; Pantea, A.

    1998-01-01

    We use an extended and combined data base including historical and modern, qualitative and quantitative data, i.e., more than 25 events during the period 1790 - 1990 with epicentral/maximum intensities ranging from X to V degree (MSK scale), the variation interval of isoseismal curves ranging from IX th to III rd degree. The data set was analysed using both the sum phasor techniques of Ridelek and Sacks (1984) for different magnitudes and depth intervals and the Stepp's method. For the assessment of seismic hazard we need a pattern of seismic source regions including an estimation for the maximum expected magnitude and the return period for the studied regions. Another necessary step in seismic hazard assessment is to develop attenuation relationships specific to a seismogenic zone, particularly to sub-crustal earthquakes of Vrancea region. The conceptual frame involves the use of appropriate decay models and consideration of the randomness in the attenuation, taking into account the azimuthal variation of the isoseist shapes. (authors)

  15. Effects of nuclear electromagnetic pulse (EMP) on synchronous stability of the electric power system

    International Nuclear Information System (INIS)

    Manweiler, R.W.

    1975-11-01

    The effects of a nuclear electromagnetic pulse (EMP) on the synchronous stability of the electric power transmission and distribution systems are evaluated. The various modes of coupling of EMP to the power system are briefly discussed, with particular emphasis on those perturbations affecting the synchronous stability of the transmission system. A brief review of the fundamental concepts of the stability problem is given, with a discussion of the general characteristics of transient analysis. A model is developed to represent single sets as well as repetitive sets of multiple faults on the distribution systems, as might be produced by EMP. The results of many numerical stability calculations are presented to illustrate the transmission system's response from different types of perturbations. The important parameters of both multiple and repetitive faults are studied, including the dependence of the response on the size of the perturbed area, the fault density, and the effective impedance between the fault location and the transmission system. Both major load reduction and the effect of the opening of tie lines at the time of perturbation are also studied. We conclude that there is a high probability that EMP can induce perturbations on the distribution networks causing a large portion of the transmission network in the perturbed area to lose synchronism. The result would be an immediate and massive power failure

  16. Design of a bounded wave EMP (Electromagnetic Pulse) simulator

    Science.gov (United States)

    Sevat, P. A. A.

    1989-06-01

    Electromagnetic Pulse (EMP) simulators are used to simulate the EMP generated by a nuclear weapon and to harden equipment against the effects of EMP. At present, DREO has a 1 m EMP simulator for testing computer terminal size equipment. To develop the R and D capability for testing larger objects, such as a helicopter, a much bigger threat level facility is required. This report concerns the design of a bounded wave EMP simulator suitable for testing large size equipment. Different types of simulators are described and their pros and cons are discussed. A bounded wave parallel plate type simulator is chosen for it's efficiency and the least environmental impact. Detailed designs are given for 6 m and 10 m parallel plate type wire grid simulators. Electromagnetic fields inside and outside the simulators are computed. Preliminary specifications for a pulse generator required for the simulator are also given. Finally, the electromagnetic fields radiated from the simulator are computed and discussed.

  17. Implementing network constraints in the EMPS model

    Energy Technology Data Exchange (ETDEWEB)

    Helseth, Arild; Warland, Geir; Mo, Birger; Fosso, Olav B.

    2010-02-15

    This report concerns the coupling of detailed market and network models for long-term hydro-thermal scheduling. Currently, the EPF model (Samlast) is the only tool available for this task for actors in the Nordic market. A new prototype for solving the coupled market and network problem has been developed. The prototype is based on the EMPS model (Samkjoeringsmodellen). Results from the market model are distributed to a detailed network model, where a DC load flow detects if there are overloads on monitored lines or intersections. In case of overloads, network constraints are generated and added to the market problem. Theoretical and implementation details for the new prototype are elaborated in this report. The performance of the prototype is tested against the EPF model on a 20-area Nordic dataset. (Author)

  18. Measures to protect communication systems from EMP effects

    International Nuclear Information System (INIS)

    Stadler, B.

    1977-01-01

    Possible EMP damage in transmitter and receiver elements, including antennas, is dealt with. It is recommendet that these important systems should be installed inside a commercially available Faraday cage for do-it-yourself assembly. (HP) [de

  19. EMP protection procedure for electrical/electronic systems

    International Nuclear Information System (INIS)

    Latorre, V.R.

    1976-01-01

    This paper presents a procedure for the protection engineer to follow in assessing a system with respect to its susceptibility to an electromagnetic pulse (EMP), and in determining whether the system requires protection. If the system is determined to be vulnerable to EMP, the procedure also indicates how to decide upon the most suitable protection scheme. The discussion centers on two flow charts, which illustrate the step-by-step procedure which utilizes the necessary ingredients of EMP protection engineering discussed in a previous paper. The description of the protection procedure is divided into two parts: the first dealing with issues on the macroscopic or large-scale system level, while the second is concerned with operations on the subsystem level or lower

  20. EMP Threats to US National Security: Congressional Responses

    Science.gov (United States)

    Huessy, Peter

    2011-04-01

    The US Congress is considering how best to respond to concerns that EMP is a real and present danger to US security. The threats come from a variety of areas: solar storms, non-nuclear EMP from man-made machines and devices; and nuclear EMP from a nuclear device exploded above CONUS or other critical areas important to the United States and its allies. Responses have to date included passage in the House of legislation to protect the electrical grid in the United States from such threats and hearings before the Homeland Security Committee. Additional efforts include examining missile defense responses, protection of the maritime domain, and hardening of US military and related civilian infrastructure. The House of Representatives has also examined what Europe, the European Union and NATO, both government and private industry, have done in these areas. Complicating matters are related issues of cyber-security and overall homeland security priorities.

  1. A cross-country Exchange Market Pressure (EMP) dataset.

    Science.gov (United States)

    Desai, Mohit; Patnaik, Ila; Felman, Joshua; Shah, Ajay

    2017-06-01

    The data presented in this article are related to the research article titled - "An exchange market pressure measure for cross country analysis" (Patnaik et al. [1]). In this article, we present the dataset for Exchange Market Pressure values (EMP) for 139 countries along with their conversion factors, ρ (rho). Exchange Market Pressure, expressed in percentage change in exchange rate, measures the change in exchange rate that would have taken place had the central bank not intervened. The conversion factor ρ can interpreted as the change in exchange rate associated with $1 billion of intervention. Estimates of conversion factor ρ allow us to calculate a monthly time series of EMP for 139 countries. Additionally, the dataset contains the 68% confidence interval (high and low values) for the point estimates of ρ 's. Using the standard errors of estimates of ρ 's, we obtain one sigma intervals around mean estimates of EMP values. These values are also reported in the dataset.

  2. Steroid hormone regulation of EMP2 expression and localization in the endometrium

    Directory of Open Access Journals (Sweden)

    Williams Carmen J

    2008-04-01

    Full Text Available Abstract Background The tetraspan protein epithelial membrane protein-2 (EMP2, which mediates surface display of diverse proteins, is required for endometrial competence in blastocyst implantation, and is uniquely correlated with poor survival from endometrial adenocarcinoma tumors. Because EMP2 is differentially expressed in the various stages of the murine and human estrous cycle, we tested the hypothesis that the steroid hormones progesterone and estrogen influence EMP2 expression and localization. Methods Frozen human proliferative and secretory endometrium were collected and analyzed for EMP2 expression using SDS-PAGE/Western blot analysis. The response of EMP2 to progesterone and estradiol was determined using a combination of real-time PCR, SDS-PAGE/Western blot analysis, and confocal immunofluorescence in the human endometrial carcinoma cell line RL95-2. To confirm the in vitro results, ovariectomized mice were treated with progesterone or estradiol, and EMP2 expression was analyzed using immunohistochemistry. Results Within normal human endometrium, EMP2 expression is upregulated in the secretory phase relative to the proliferative phase. To understand the role of steroid hormones on EMP2 expression, we utilized RL95-2 cells, which express both estrogen and progesterone receptors. In RL95-2 cells, both estradiol and progesterone induced EMP2 mRNA expression, but only progesterone induced EMP2 protein expression. To compare steroid hormone regulation of EMP2 between humans and mice, we analyzed EMP2 expression in ovarectomized mice. Similar to results observed in humans, progesterone upregulated endometrial EMP2 expression and induced EMP2 translocation to the plasma membrane. Estradiol did not promote translocation to the cell surface, but moderately induced EMP2 expression in cytoplasmic compartments in vivo. Conclusion These findings suggest that targeting of EMP2 to specific locations under the influence of these steroid hormones may

  3. Performa Supply Chain Emping Melinjo di Kabupaten Bantul Daerah Istimewa Yogyakarta

    Directory of Open Access Journals (Sweden)

    Eni Istiyanti

    2017-07-01

    Full Text Available Emping melinjo was one of the agroindustry-products that had great potential to be developed. The industry of emping melinjo contributed more on economic growth in the reason of creating jobs and alleviate poverty. The purpose of this study was to describe the performance of supply chain of emping melinjo from upstream to downstream and analyze the efficiency of supply chain of emping melinjo in Bantul regency. Field study to obtain primary data was done through interviews with the practitioners of emping melinjo supply chain (including farmers and merchants of melinjo as well as producers and retailers of melinjo chips. The results of field studies then tabulated and analyzed descriptively and quantitatively using Linear Programming. The analysis showed that there were 37 supply chain networks of emping melinjo in Bantul. The practitioners of upstream supply chain were melinjo farmers, middlemen, traders, wholesalers, and retailers, while in the downstream, were emping melinjo producers, traders, small traders, wholesalers, retailers and consumers. The activities of the doer of emping melinjo supply chain includes purchasing, sales, harvesting, packaging, packing, stripping, storage, loading and unloading, transporting, sorting and grading. The flow of products and money in the supply chain of emping melinjo run smoothly, while the flow of information was sluggish. Based on linear programming analysis the cost of supply chain of emping melinjo would reach minimum level at Rp33,969,264 per week if the production of emping melinjo as many as 25 361 kg per week wich was distributed using 22 networks.

  4. Climate Drivers of Spatiotemporal Variability of Precipitation in the Source Region of Yangtze River

    Science.gov (United States)

    Du, Y.; Berndtsson, R.; An, D.; Yuan, F.

    2017-12-01

    Variability of precipitation regime has significant influence on the environment sustainability in the source region of Yangtze River, especially when the vegetation degradation and biodiversity reduction have already occurred. Understanding the linkage between variability of local precipitation and global teleconnection patterns is essential for water resources management. Based on physical reasoning, indices of the climate drivers can provide a practical way of predicting precipitation. Due to high seasonal variability of precipitation, climate drivers of the seasonal precipitation also varies. However, few reports have gone through the teleconnections between large scale patterns with seasonal precipitation in the source region of Yangtze River. The objectives of this study are therefore (1) assessment of temporal trend and spatial variability of precipitation in the source region of Yangtze River; (2) identification of climate indices with strong influence on seasonal precipitation anomalies; (3) prediction of seasonal precipitation based on revealed climate indices. Principal component analysis and Spearman rank correlation were used to detect significant relationships. A feed-forward artificial neural network(ANN) was developed to predict seasonal precipitation using significant correlated climate indices. Different influencing climate indices were revealed for precipitation in each season, with significant level and lag times. Significant influencing factors were selected to be the predictors for ANN model. With correlation coefficients between observed and simulated precipitation over 0.5, the results were eligible to predict the precipitation of spring, summer and winter using teleconnections, which can improve integrated water resources management in the source region of Yangtze River.

  5. Development of a new EMP code at LANL

    Science.gov (United States)

    Colman, J. J.; Roussel-Dupré, R. A.; Symbalisty, E. M.; Triplett, L. A.; Travis, B. J.

    2006-05-01

    A new code for modeling the generation of an electromagnetic pulse (EMP) by a nuclear explosion in the atmosphere is being developed. The source of the EMP is the Compton current produced by the prompt radiation (γ-rays, X-rays, and neutrons) of the detonation. As a first step in building a multi- dimensional EMP code we have written three kinetic codes, Plume, Swarm, and Rad. Plume models the transport of energetic electrons in air. The Plume code solves the relativistic Fokker-Planck equation over a specified energy range that can include ~ 3 keV to 50 MeV and computes the resulting electron distribution function at each cell in a two dimensional spatial grid. The energetic electrons are allowed to transport, scatter, and experience Coulombic drag. Swarm models the transport of lower energy electrons in air, spanning 0.005 eV to 30 keV. The swarm code performs a full 2-D solution to the Boltzmann equation for electrons in the presence of an applied electric field. Over this energy range the relevant processes to be tracked are elastic scattering, three body attachment, two body attachment, rotational excitation, vibrational excitation, electronic excitation, and ionization. All of these occur due to collisions between the electrons and neutral bodies in air. The Rad code solves the full radiation transfer equation in the energy range of 1 keV to 100 MeV. It includes effects of photo-absorption, Compton scattering, and pair-production. All of these codes employ a spherical coordinate system in momentum space and a cylindrical coordinate system in configuration space. The "z" axis of the momentum and configuration spaces is assumed to be parallel and we are currently also assuming complete spatial symmetry around the "z" axis. Benchmarking for each of these codes will be discussed as well as the way forward towards an integrated modern EMP code.

  6. Hardening techniques for nuclear generated EMPs: Pt. 1

    International Nuclear Information System (INIS)

    Anon.

    1987-01-01

    This article is intended as an introduction to the protection of electronic equipment against the effects of the electromagnetic pulse (EMP) generated by a nuclear explosion. For explosions at heights above 100 km the energy in the pulse is considerable over areas of many thousands of square metres. This constitutes a major threat to electronic equipments which have not been exposed to the consequences of closer nuclear explosions (namely blast, thermal and nuclear radiation)

  7. A cross-country Exchange Market Pressure (EMP dataset

    Directory of Open Access Journals (Sweden)

    Mohit Desai

    2017-06-01

    Full Text Available The data presented in this article are related to the research article titled - “An exchange market pressure measure for cross country analysis” (Patnaik et al. [1]. In this article, we present the dataset for Exchange Market Pressure values (EMP for 139 countries along with their conversion factors, ρ (rho. Exchange Market Pressure, expressed in percentage change in exchange rate, measures the change in exchange rate that would have taken place had the central bank not intervened. The conversion factor ρ can interpreted as the change in exchange rate associated with $1 billion of intervention. Estimates of conversion factor ρ allow us to calculate a monthly time series of EMP for 139 countries. Additionally, the dataset contains the 68% confidence interval (high and low values for the point estimates of ρ’s. Using the standard errors of estimates of ρ’s, we obtain one sigma intervals around mean estimates of EMP values. These values are also reported in the dataset.

  8. Application of a generalized Leibniz rule for calculating electromagnetic fields within continuous source regions

    International Nuclear Information System (INIS)

    Silberstein, M.

    1991-01-01

    In deriving the electric and magnetic fields in a continuous source region by differentiating the vector potential, Yaghjian (1985) explains that the central obstacle is the dependence of the integration limits on the differentiation variable. Since it is not mathematically rigorous to assume the curl and integral signs are interchangeable, he uses an integration variable substitution to circumvent this problematic dependence. Here, an alternative derivation is presented, which evaluates the curl of the vector potential volume integral directly, retaining the dependence of the limits of integration on the differentiation variable. It involves deriving a three-dimensional version of Leibniz' rule for differentiating an integral with variable limits of integration, and using the generalized rule to find the Maxwellian and cavity fields in the source region. 7 refs

  9. Airborne black carbon concentrations over an urban region in western India-temporal variability, effects of meteorology, and source regions.

    Science.gov (United States)

    Bapna, Mukund; Sunder Raman, Ramya; Ramachandran, S; Rajesh, T A

    2013-03-01

    This study characterizes over 5 years of high time resolution (5 min), airborne black carbon (BC) concentrations (July 2003 to December 2008) measured over Ahmedabad, an urban region in western India. The data were used to obtain different time averages of BC concentrations, and these averages were then used to assess the diurnal, seasonal, and annual variability of BC over the study region. Assessment of diurnal variations revealed a strong association between BC concentrations and vehicular traffic. Peaks in BC concentration were co-incident with the morning (0730 to 0830, LST) and late evening (1930 to 2030, LST) rush hour traffic. Additionally, diurnal variability in BC concentrations during major festivals (Diwali and Dushera during the months of October/November) revealed an increase in BC concentrations due to fireworks displays. Maximum half hourly BC concentrations during the festival days were as high as 79.8 μg m(-3). However, the high concentrations rapidly decayed suggesting that local meteorology during the festive season was favorable for aerosol dispersion. A multiple linear regression (MLR) model with BC as the dependent variable and meteorological parameters as independent variables was fitted. The variability in temperature, humidity, wind speed, and wind direction accounted for about 49% of the variability in measured BC concentrations. Conditional probability function (CPF) analysis was used to identify the geographical location of local source regions contributing to the effective BC measured (at 880 nm) at the receptor site. The east north-east (ENE) direction to the receptor was identified as a major source region. National highway (NH8) and two coal-fired thermal power stations (at Gandhinagar and Sabarmati) were located in the identified direction, suggesting that local traffic and power plant emissions were likely contributors to the measured BC.

  10. Multipoint investigation of the source region of storm-time chorus

    Directory of Open Access Journals (Sweden)

    O. Santolík

    2004-07-01

    Full Text Available In this case study we investigate the source region of whistler-mode chorus located close to the geomagnetic equator at a radial distance of 4.4 Earth radii. We use measurements from the four Cluster spacecraft at separations of less than a few hundreds of km, recorded during the geomagnetic storm of 18 April 2002. The waveforms of the electric field fluctuations were obtained by the WBD instruments in the frequency range 50Hz-9.5kHz. Using these data, we calculate linear and rank correlation coefficients of the frequency averaged power-spectral density measured by the different spacecraft. Those coefficients have been recently shown to decrease with spacecraft separation distance perpendicular to the static magnetic field cchor03 with a characteristic scale length of 100km. We find this characteristic scale varying between 60 and 200km for different data intervals inside the source region. We examine possible explanations for the observed large scatter of the correlation coefficients, and we suggest a simultaneously acting effect of random positions of locations at which the individual chorus wave packets are generated. The statistical properties of the observations are approximately reproduced by a simple 2-D model of the source region, assuming a perpendicular half-width of 35km (approximately one wavelength of the whistler-mode waves for the distribution of power radiated from individual active areas.

  11. Nuclear EMP induced chaos. [Effect of nuclear explosion on power and communication facilities

    Energy Technology Data Exchange (ETDEWEB)

    Dance, B

    1983-04-01

    It is anticipated that a single nuclear explosion, of adequate size, on the outside of the atmosphere would generate a pulse of sufficient intensity to damage communications equipment (including telephones, radio transmitters and receivers), and to disrupt main power supplies. This damage could be done by a very intense, short duration electro-magnetic pulse (EMP). The article discusses the generation and history of EMP, the test facilities that are needed for EMP test, and techniques that can be used to harden equipment against EMP. It is also important to protect extensive systems against EMP. The article points out that fibre-optics are very useful, because they are EMP resistant and a single fibre can also carry a very high data rate.

  12. Kemasan Menarik dan Internet Marketing untuk Meningkatkan Nilai Jual Emping Garut sebagai Produk Unggulan Kabupaten Sragen

    Directory of Open Access Journals (Sweden)

    Sari Purnavita

    2018-03-01

    Full Text Available Tanaman garut termasuk dalam jenis umbi-umbian yang banyak ditanam oleh masyarakat yang tinggal di Kecamatan Gesi, Kabupaten Sragen. Di Kabupaten Sragen terdapat beberapa industri rumah tangga emping garut, dua di antaranya yang memiliki motivasi sangat besar untuk berkembang adalah UKM emping garut “Sumber Rejeki” dan UKM emping garut “Fadilah”. Permasalahan kedua UKM adalah keterbatasan inovasi rasa emping garut, kemasan sangat sederhana, dan sistem pemasaran masih tradisional sehingga sehingga omzet penjualan dan nilai jual produk masih rendah. Untuk meningkatkan omzet penjualan dapat dilakukan dengan perbaikan inovasi dan teknologi pengemasan, teknologi seasoning dengan bumbu tabur, dan memperluas pemasaran dengan media internet. Produk emping garut yang dikemas secara menarik, inovasi produk emping garut aneka rasa, dan pemasaran dengan media internet melalui blogspot dapat menenbus pemasaran secara luas baik di toko-toko besar, harga jual produk meningkat 50%,dan omzet penjualan meningkat 100%.

  13. The integrated circuit IC EMP transient state disturbance effect experiment method investigates

    International Nuclear Information System (INIS)

    Li Xiaowei

    2004-01-01

    Transient state disturbance characteristic study on the integrated circuit, IC, need from its coupling path outset. Through cable (aerial) coupling, EMP converts to an pulse current voltage and results in the impact to the integrated circuit I/O orifice passing the cable. Aiming at the armament system construction feature, EMP effect to the integrated circuit, IC inside the system is analyzed. The integrated circuit, IC EMP effect experiment current injection method is investigated and a few experiments method is given. (authors)

  14. Exponential Megapriming PCR (EMP) Cloning—Seamless DNA Insertion into Any Target Plasmid without Sequence Constraints

    Science.gov (United States)

    Ulrich, Alexander; Andersen, Kasper R.; Schwartz, Thomas U.

    2012-01-01

    We present a fast, reliable and inexpensive restriction-free cloning method for seamless DNA insertion into any plasmid without sequence limitation. Exponential megapriming PCR (EMP) cloning requires two consecutive PCR steps and can be carried out in one day. We show that EMP cloning has a higher efficiency than restriction-free (RF) cloning, especially for long inserts above 2.5 kb. EMP further enables simultaneous cloning of multiple inserts. PMID:23300917

  15. Exponential megapriming PCR (EMP cloning--seamless DNA insertion into any target plasmid without sequence constraints.

    Directory of Open Access Journals (Sweden)

    Alexander Ulrich

    Full Text Available We present a fast, reliable and inexpensive restriction-free cloning method for seamless DNA insertion into any plasmid without sequence limitation. Exponential megapriming PCR (EMP cloning requires two consecutive PCR steps and can be carried out in one day. We show that EMP cloning has a higher efficiency than restriction-free (RF cloning, especially for long inserts above 2.5 kb. EMP further enables simultaneous cloning of multiple inserts.

  16. DEVELOPING LINGUISTIC SKILLS AND ABILITIES IN EMP STUDENTS

    Directory of Open Access Journals (Sweden)

    Nataša Milosavljević

    2012-03-01

    Full Text Available English for medical purposes falls within the category of discipline-specific language learning. It is characterized by specific linguistic features and requires specific study that is possible to carry out using specially designed programmes. Reading skill is one way of learning strategy of English for medical purposes. Most often, students use this skill in order to obtain information for some particular topic from the area of medical science, or because they need some sort of instruction in order to carry out certain task. Vocabulary acquisition plays a very important role in EMP teaching. It is achieved best through learning vocabulary in context, rather than in isolation. One of the most important questions in EMP teaching is related to what grammatical constructions should be analysed and emphasised. Some types of these activities would include, for example, asking students to find examples of one particular structure in the text or fill in the blanks with the missing forms such as tenses, passive forms, prepositions, etc. Speaking skill represents productive skill the aim of which is communication. In order for foreign language communication to be suucessful, a student should know linguistic and cultural features of native speakers and follow certain rules and conventions that are not easy to define. It is of crucial importance that during teaching process students develop strategies and techniques that will help them use linguistic structures fluently, apply language in different situations, take part in discussions, and use acquired vocabulary in accurate and precise way.

  17. Meteorite Source Regions as Revealed by the Near-Earth Object Population

    Science.gov (United States)

    Binzel, Richard P.; DeMeo, Francesca E.; Burt, Brian J.; Polishook, David; Burbine, Thomas H.; Bus, Schelte J.; Tokunaga, Alan; Birlan, Mirel

    2014-11-01

    Spectroscopic and taxonomic information is now available for 1000 near-Earth objects, having been obtained through both targeted surveys (e.g. [1], [2], [3]) or resulting from all-sky surveys (e.g. [4]). We determine their taxonomic types in the Bus-DeMeo system [5] [6] and subsequently examine meteorite correlations based on spectral analysis (e.g. [7],[8]). We correlate our spectral findings with the source region probabilities calculated using the methods of Bottke et al. [9]. In terms of taxonomy, very clear sources are indicated: Q-, Sq-, and S-types most strongly associated with ordinary chondrite meteorites show clear source signatures through the inner main-belt. V-types are relatively equally balanced between nu6 and 3:1 resonance sources, consistent with the orbital dispersion of the Vesta family. B- and C-types show distinct source region preferences for the outer belt and for Jupiter family comets. A Jupiter family comet source predominates for the D-type near-Earth objects, implying these "asteroidal" bodies may be extinct or dormant comets [10]. Similarly, near-Earth objects falling in the spectrally featureless "X-type" category also show a strong outer belt and Jupiter family comet source region preference. Finally the Xe-class near-Earth objects, which most closely match the spectral properties of enstatite achondrite (aubrite) meteorites seen in the Hungaria region[11], show a source region preference consistent with a Hungaria origin by entering near-Earth space through the Mars crossing and nu6 resonance pathways. This work supported by the National Science Foundation Grant 0907766 and NASA Grant NNX10AG27G.[1] Lazzarin, M. et al. (2004), Mem. S. A. It. Suppl. 5, 21. [2] Thomas, C. A. et al. (2014), Icarus 228, 217. [3] Tokunaga, A. et al. (2006) BAAS 38, 59.07. [4] Hasselmann, P. H., Carvano, J. M., Lazzaro, D. (2011) NASA PDS, EAR-A-I0035-5-SDSSTAX-V1.0. [5] Bus, S.J., Binzel, R.P. (2002). Icarus 158, 146. [6] DeMeo, F.E. et al. (2009), Icarus

  18. An experimental study on the near-source region of lazy turbulent plumes

    Science.gov (United States)

    Ciriello, Francesco; Hunt, Gary R.

    2017-11-01

    The near-source region of a `lazy' turbulent buoyant plume issuing from a circular source is examined for source Richardson numbers in the range of 101 to 107. New data is acquired for the radial contraction and streamwise variation of volume flux through an experimental programme of dye visualisations and particle image velocimetry. This data reveals the limited applicability of traditional entrainment laws used in integral modelling approaches for the description of the near-source region for these source Richardson numbers. A revised entrainment function is proposed, based on which we introduce a classification of plume behaviour whereby the degree of `laziness' may be expressed in terms of the excess dilution that occurs compared to a `pure' constant Richardson number plume. The increased entrainment measured in lazy plumes is attributed to Rayleigh-Taylor instabilities developing along the contraction of the plume which promote the additional engulfment of ambient fluid into the plume. This work was funded by an EPSRC Industial Case Award sponsored by Dyson Technology Ltd. Special thanks go to the members of the Dyson Environmental Control Group that regularly visit us in Cambridge for discussions about our work.

  19. The optimal on-source region size for detections with counting-type telescopes

    Energy Technology Data Exchange (ETDEWEB)

    Klepser, Stefan

    2017-01-15

    The on-source region is typically a circular area with radius θ in which the signal is expected to appear with the shape of the instrument point spread function (PSF). This paper addresses the question of what is the θ that maximises the probability of detection for a given PSF width and background event density. In the high count number limit and assuming a Gaussian PSF profile, the optimum is found to be at ζ{sup 2}{sub ∞}∼2.51 times the squared PSF width σ{sup 2}{sub PSF39}. While this number is shown to be a good choice in many cases, a dynamic formula for cases of lower count numbers, which favour larger on-source regions, is given. The recipe to get to this parametrisation can also be applied to cases with a non-Gaussian PSF. This result can standardise and simplify analysis procedures, reduce trials and eliminate the need for experience-based ad hoc cut definitions or expensive case-by-case Monte Carlo simulations.

  20. The optimal on-source region size for detections with counting-type telescopes

    International Nuclear Information System (INIS)

    Klepser, Stefan

    2017-01-01

    The on-source region is typically a circular area with radius θ in which the signal is expected to appear with the shape of the instrument point spread function (PSF). This paper addresses the question of what is the θ that maximises the probability of detection for a given PSF width and background event density. In the high count number limit and assuming a Gaussian PSF profile, the optimum is found to be at ζ"2_∞∼2.51 times the squared PSF width σ"2_P_S_F_3_9. While this number is shown to be a good choice in many cases, a dynamic formula for cases of lower count numbers, which favour larger on-source regions, is given. The recipe to get to this parametrisation can also be applied to cases with a non-Gaussian PSF. This result can standardise and simplify analysis procedures, reduce trials and eliminate the need for experience-based ad hoc cut definitions or expensive case-by-case Monte Carlo simulations.

  1. Promoter Hypermethylation of the EMP3 Gene in a Series of 229 Human Gliomas

    Directory of Open Access Journals (Sweden)

    Marta Mellai

    2013-01-01

    Full Text Available The epithelial membrane protein 3 (EMP3 is a candidate tumor suppressor gene in the critical region 19q13.3 for several solid tumors, including tumors of the nervous systems. The aim of this study was to investigate the EMP3 promoter hypermethylation status in a series of 229 astrocytic and oligodendroglial tumors and in 16 GBM cell lines. The analysis was performed by methylation-specific PCR and capillary electrophoresis. Furthermore, the EMP3 expression at protein level was evaluated by immunohistochemistry and Western blotting analysis. Associations of EMP3 hypermethylation with total 1p/19q codeletion, MGMT promoter hypermethylation, IDH1/IDH2 and TP53 mutations, and EGFR amplification were studied, as well as its prognostic significance. The EMP3 promoter hypermethylation has been found in 39.5% of gliomas. It prevailed in low-grade tumors, especially in gliomas with an oligodendroglial component, and in sGBMs upon pGBMs. In oligodendroglial tumors, it was strongly associated with both IDH1/IDH2 mutations and total 1p/19q codeletion and inversely with EGFR gene amplification. No association was found with MGMT hypermethylation and TP53 mutations. In the whole series, the EMP3 hypermethylation status correlated with 19q13.3 loss and lack of EMP3 expression at protein level. A favorable prognostic significance on overall survival of the EMP3 promoter hypermethylation was found in patients with oligodendroglial tumors.

  2. The EMP excitation of radiation by the pulsed relativistic electron beam

    International Nuclear Information System (INIS)

    Balakirev, V.A.; Sidelnikov, G.L.

    1996-01-01

    The mechanisms of excitation of ultra-wideband electromagnetic pulses (EMP) by short pulses of high-current relativistic electron beams were proposed and investigated. It is shown that the transformation efficiency of the bunch kinetic energy to the excited energy of the EMP can be very significant. (author). 2 figs., 4 refs

  3. Mesothelioma and other lung disease in taconite miners; the uncertain role of non-asbestiform EMP.

    Science.gov (United States)

    Mandel, Jeffrey H; Odo, Nnaemeka U

    2018-04-10

    The purpose of this paper was to assess the role of non-asbestiform amphibole EMPs in the etiology of mesotheliomas and other lung disease in taconite (iron ore) miners. Increased mesothelioma rates have been described in Minnesota taconite workers since the late 1990s. Currently, over 100 cases have been reported by the Minnesota Department of Health within the complete cohort of miners in Minnesota. Geologic sampling has indicated that only the eastern part of the iron range contains non-asbestiform amphibole elongate mineral particles (EMPs), in close proximity to the ore. This type of EMP has been less studied and also exists in talc and gold mining. A series of investigations into the state's taconite industry have been recently completed. Results from a cohort mortality study indicated an SMR of 2.77 (95% CI = 1.87-3.96) for mesothelioma. In a case-control study, the odds ratio for mesothelioma for high vs. low EMP exposure was 2.25 (5% CI = 1.13-4.5) but EMPs in this study were counted by phase contrast microscopy. Odds ratios were not elevated in mines located in the eastern part of the Mesabi iron range. The overall findings suggest that mesothelioma in taconite miners is related to EMP exposure. Because of the way EMPs were counted, results from these studies cannot allow a firm conclusion about the association between EMP exposure and the reported excess mesothelioma. Copyright © 2018 Elsevier Inc. All rights reserved.

  4. The EMP excitation of radiation by the pulsed relativistic electron beam

    Energy Technology Data Exchange (ETDEWEB)

    Balakirev, V A; Sidelnikov, G L [Kharkov Inst. of Physics and Technology (Russian Federation)

    1997-12-31

    The mechanisms of excitation of ultra-wideband electromagnetic pulses (EMP) by short pulses of high-current relativistic electron beams were proposed and investigated. It is shown that the transformation efficiency of the bunch kinetic energy to the excited energy of the EMP can be very significant. (author). 2 figs., 4 refs.

  5. Methods for Free-Space Ultra-Short Solitary EMP Measurement

    Directory of Open Access Journals (Sweden)

    Petr Drexler

    2006-01-01

    Full Text Available There are some suitable methods for ultra-short solitary electromagnetic pulses (EMP measurement. The EMPs are generated by high power microwave generators. The characteristic of EMPs is high power level (Pmax = 250 MW and very short time duration (tp Î <1, 60> ns. Special requirements for measurement methods are placed because of the specific EMPs properties.Two suitable methods for this application are presented in the paper. The first – calorimetric method, utilizes the thermal impacts of microwave absorption. The second method presented – magneto-optic method, use the Faraday’s magneto-optic effect as a sensor principle. It was realized combined calorimetric sensor and there were made some experimental EMP measurements with good results. The sensor utilizing magneto-optic method is in development.

  6. Nuclear EMP: stripline test method for measuring transfer impedance

    International Nuclear Information System (INIS)

    Miller, J.S.

    1975-11-01

    A method for measuring the transfer impedance of flat metal joints for frequencies to 100 MHz has been developed which makes use of striplines. The stripline method, which has similarities to the quadraxial method used for cylindrical components, is described and sets of test results are given. The transfer impedance of a simple joint is modeled as a spurious hyperbolic curve, and a close curve fit to transfer impedance test data from various samples is demonstrated for both the stripline and the quadraxial methods. Validity checks of the test data are discussed using the curve model and other criteria. The method was developed for testing riveted joints which form the avionics bays on B-1s. The joints must provide shielding from EMP currents

  7. Preliminary analysis on the tectonic stress level in the source region of Tangshan earthquake

    Science.gov (United States)

    Jian-Tao, Zhao; Cui, Xiao-Feng; Xie, Fu-Ren

    2002-05-01

    The abundant data of focal mechanism solutions in Tangshan region, China, are inverted for the tectonic stress field. Combined with tectonophysical consideration, the magnitude of the three principal stresses, as well as their vertical variation under the average crustal rock property, in the source region of the 1976 Tangshan earthquake is estimated. The relationship between crustal stress and friction μ c, pore pressure P 0 and stress shape factor Φ is studied. The paper draws the conclusion that the vertical increasing rate of the maximum principal stress σ is directly proportional to friction, and inversely to pore pressure P 0 and stress shape factor Φ; while the vertical increasing rate of the minimum principal tress σ is directly proportional to pore pressure P 0, inversely to friction μ c and stress shape factor Φ. This study is a try to invert the data of focal mechanism solutions for the complete stress tensor.

  8. ALMA Thermal Observations of a Proposed Plume Source Region on Europa

    Energy Technology Data Exchange (ETDEWEB)

    Trumbo, Samantha K.; Brown, Michael E. [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States); Butler, Bryan J. [National Radio Astronomy Observatory, Socorro, NM 87801 (United States)

    2017-10-01

    We present a daytime thermal image of Europa taken with the Atacama Large Millimeter Array. The imaged region includes the area northwest of Pwyll Crater, which is associated with a nighttime thermal excess seen by the Galileo Photopolarimeter Radiometer and with two potential plume detections. We develop a global thermal model of Europa and simulate both the daytime and nighttime thermal emission to determine if the nighttime thermal anomaly is caused by excess endogenic heat flow, as might be expected from a plume source region. We find that the nighttime and daytime brightness temperatures near Pwyll Crater cannot be matched by including excess heat flow at that location. Rather, we can successfully model both measurements by increasing the local thermal inertia of the surface.

  9. Correlation between Angular Widths of CMEs and Characteristics of Their Source Regions

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, X. H.; Feng, X. S. [State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190 (China); Feng, H. Q. [Institute of Space Physics, Luoyang Normal University, Luoyang, Henan 471934 (China); Li, Z. [Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044 (China)

    2017-11-10

    The angular width of a coronal mass ejection (CME) is an important factor in determining whether the corresponding interplanetary CME (ICME) and its preceding shock will reach Earth. However, there have been very few studies of the decisive factors of the CME’s angular width. In this study, we use the three-dimensional (3D) angular width of CMEs obtained from the Graduated Cylindrical Shell model based on observations of Solar Terrestrial Relations Observatory ( STEREO ) to study the relations between the CME’s 3D width and characteristics of the CME’s source region. We find that for the CMEs produced by active regions (ARs), the CME width has some correlations with the AR’s area and flux, but these correlations are not strong. The magnetic flux contained in the CME seems to come from only part of the AR’s total flux. For the CMEs produced by flare regions, the correlations between the CME angular width and the flare region’s area and flux are strong. The magnetic flux within those CMEs seems to come from the whole flare region or even from a larger region than the flare. Our findings show that the CME’s 3D angular width can be generally estimated based on observations of Solar Dynamics Observatory for the CME’s source region instead of the observations from coronagraphs on board the Solar and Heliospheric Observatory and STEREO if the two foot points of the CME stay in the same places with no expansion of the CME in the transverse direction until reaching Earth.

  10. Long range transport of CO and ozone from source regions in Asia

    Energy Technology Data Exchange (ETDEWEB)

    Jaffe, D.; Mahura, A. [Univ. of Alaska, Fairbanks, AK (United States)]|[Institute of Northern Ecological Problems, Moscow (Russian Federation); Novelli, P. [Univ. of Colorado, Boulder, CO (United States); Merrill, J. [Univ. of Rhode Island, Narraganset, RI (United States)

    1996-12-31

    Based on current understanding of the atmosphere, CO and photochemically produced ozone can be transported thousands of kilometers prior to being removed. Emissions from Asia have a possible impact on the CO and ozone concentrations over the U.S. west coast following transport across the Pacific Ocean. If this is correct, then there are implications for ozone control strategies in the downwind region. Evidence includes: (1) Global 3D chemical transport models indicating a monthly mean enhancement of 10-20% on the US west coast for both CO and ozone during winter-spring due to emissions from Asia; and (2) CO and O{sub 3} data from several Pacific sites which demonstrate that Asian pollutants can be transported great distances. The weekly flask data clearly define a CO seasonal cycle. In the present analysis we use a locally weighted smoothing technique to identify individual data outliers from the smoothed seasonal cycle. We hypothesize that these outliers represent periods when continental emissions influenced the atmospheric mixing ratios at these locations. Using isentropic back trajectories we try to identify a possible source region or pathway for each event and present a distribution of the trajectory types for the events. For the events at Midway, Mauna Loa, Guam and Shemya, we are able to identify a source region for elevated CO in 82, 72, 65 and 50% of the events, respectively. At Mauna Loa and Midway a majority of the events occur during spring and are mostly associated with transport from Asia. These events bring the highest CO mixing ratios observed at any time during the year to these sites, with CO enhancements up to 46 ppb. For Mauna Loa, a small number of events during summer are due to transport from North and Central America. In-situ ozone from Mauna Loa also demonstrates an impact from Asian emissions.

  11. Down-regulation of EMP1 is associated with epithelial hyperplasia and metaplasia in nasal polyps.

    Science.gov (United States)

    Yu, Xue Min; Li, Chun Wei; Li, Ying Ying; Liu, Jing; Lin, Zhi Bin; Li, Tian Ying; Zhao, Li; Pan, Xin Liang; Shi, Li; Wang, De Yun

    2013-11-01

    The aim of this study was to assess protein and mRNA expression of epithelial membrane protein 1 (EMP1) in the nasal mucosa of patients with nasal polyps (NP), and to determine what changes occur in response to glucocorticosteroid (GC) treatment. NP tissue was obtained from 55 patients, 18 of whom were treated with nasal GCs (i.e. these 18 patients had NP biopsies taken before and after treatment). Biopsies of inferior turbinate mucosa from 30 healthy subjects were used as controls. Quantitative PCR and immunohistochemistry were performed to determine the expression levels of EMP1. EMP1 mRNA expression was significantly lower (2.77-fold) in tissues from NP patients before GC treatment when compared to controls, but was increased in these patients after GC treatment. EMP1 staining in nasal epithelium co-localized with both basal (p63(+)) and differentiated (CK18(+)) epithelial cells. Their immunoreactivity was significantly greater in controls than NP patients. EMP1 mRNA levels were lower in the epithelium with severe hyperplasia (1.79-fold) or with metaplasia (1.85-fold) as compared to those with mild to moderate hyperplasia or non-metaplastic epithelium, respectively. Positive correlations between EMP1 and other epithelial cell-related gene (e.g. JUN, PTGS2, AREG etc.) mRNAs were observed. EMP1 could be a biomarker for aberrant epithelial remodelling and metaplasia in chronic inflammatory upper airway mucosa (e.g. NP). © 2013 John Wiley & Sons Ltd.

  12. Environmental management plan (EMP) for Melamchi water supply project, Nepal.

    Science.gov (United States)

    Khadka, Ram B; Khanal, Anil B

    2008-11-01

    More than 1.5 million people live in the Kathmandu valley. The valley is facing an extreme shortage of water supply. At the same time the demand is escalating rapidly. To address this issue of scarcity of water, the government of Nepal has proposed a project of inter-basin transfer of water from Melamchi River located 40 km north-east of the Kathmandu valley. The project will cover two districts and three municipalities and will potentially have significant impacts on the environment. In accordance with the Environmental Protection Regulation of Nepal (1997), the Melamchi Water Supply Project (MWSP) has undergone an EIA during the feasibility study stage of the proposed project. The recommendations contained in the EIA were integrated into the project design for implementation in 2006. This paper summarizes the background of MWSP, the environmental concerns described in the EIA and the status of Environmental Management Plan (EMP) developed to address environmental compliance and other issues involving participation and support of the local people. This paper also provides some lessons to learn on the modalities of addressing the demands and grievances of the local people concerning environmental management.

  13. Interface Control Document for the EMPACT Module that Estimates Electric Power Transmission System Response to EMP-Caused Damage

    Energy Technology Data Exchange (ETDEWEB)

    Werley, Kenneth Alan [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Mccown, Andrew William [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)ory

    2016-06-26

    The EPREP code is designed to evaluate the effects of an Electro-Magnetic Pulse (EMP) on the electric power transmission system. The EPREP code embodies an umbrella framework that allows a user to set up analysis conditions and to examine analysis results. The code links to three major physics/engineering modules. The first module describes the EM wave in space and time. The second module evaluates the damage caused by the wave on specific electric power (EP) transmission system components. The third module evaluates the consequence of the damaged network on its (reduced) ability to provide electric power to meet demand. This third module is the focus of the present paper. The EMPACT code serves as the third module. The EMPACT name denotes EMP effects on Alternating Current Transmission systems. The EMPACT algorithms compute electric power transmission network flow solutions under severely damaged network conditions. Initial solutions are often characterized by unacceptible network conditions including line overloads and bad voltages. The EMPACT code contains algorithms to adjust optimally network parameters to eliminate network problems while minimizing outages. System adjustments include automatically adjusting control equipment (generator V control, variable transformers, and variable shunts), as well as non-automatic control of generator power settings and minimal load shedding. The goal is to evaluate the minimal loss of customer load under equilibrium (steady-state) conditions during peak demand.

  14. Experimental study on the EMP failure mode of DC solid state relay

    International Nuclear Information System (INIS)

    Sun Beiyun; Chen Xiangyue; Zhai Aibin; Mao Congguang

    2009-01-01

    DC solid state relay is a new type switch device without touch point, and is extensive used by aviation and spaceflight technique. In this paper, the EMP failure modes of solid state relays were obtained by current injection method. (authors)

  15. Magnetohydrodynamic Electromagnetic Pulse (MHD-EMP) Interaction with Power Transmission and Distribution Systems

    National Research Council Canada - National Science Library

    Tesche, F. M; Barnes, P. R; Meliopoulos, A. P

    1992-01-01

    .... This environment, known as the magnetohydrodynamic electromagnetic pulse (MHD-EMP , is a very slowly varying electric field induced in the earth's surface, similar to the field induced by a geomagnetic storm...

  16. Expected changes in future temperature extremes and their elevation dependency over the Yellow River source region

    Directory of Open Access Journals (Sweden)

    Y. Hu

    2013-07-01

    Full Text Available Using the Statistical DownScaling Model (SDSM and the outputs from two global climate models, we investigate possible changes in mean and extreme temperature indices and their elevation dependency over the Yellow River source region for the two future periods 2046–2065 and 2081–2100 under the IPCC SRES A2, A1B and B1 emission scenarios. Changes in interannual variability of mean and extreme temperature indices are also analyzed. The validation results show that SDSM performs better in reproducing the maximum temperature-related indices than the minimum temperature-related indices. The projections show that by the middle and end of the 21st century all parts of the study region may experience increases in both mean and extreme temperature in all seasons, along with an increase in the frequency of hot days and warm nights and with a decrease in frost days. By the end of the 21st century, interannual variability increases in all seasons for the frequency of hot days and warm nights and in spring for frost days while it decreases for frost days in summer. Autumn demonstrates pronounced elevation-dependent changes in which around six out of eight indices show significant increasing changes with elevation.

  17. High frequency ion sound waves associated with Langmuir waves in type III radio burst source regions

    Directory of Open Access Journals (Sweden)

    G. Thejappa

    2004-01-01

    Full Text Available Short wavelength ion sound waves (2-4kHz are detected in association with the Langmuir waves (~15-30kHz in the source regions of several local type III radio bursts. They are most probably not due to any resonant wave-wave interactions such as the electrostatic decay instability because their wavelengths are much shorter than those of Langmuir waves. The Langmuir waves occur as coherent field structures with peak intensities exceeding the Langmuir collapse thresholds. Their scale sizes are of the order of the wavelength of an ion sound wave. These Langmuir wave field characteristics indicate that the observed short wavelength ion sound waves are most probably generated during the thermalization of the burnt-out cavitons left behind by the Langmuir collapse. Moreover, the peak intensities of the observed short wavelength ion sound waves are comparable to the expected intensities of those ion sound waves radiated by the burnt-out cavitons. However, the speeds of the electron beams derived from the frequency drift of type III radio bursts are too slow to satisfy the needed adiabatic ion approximation. Therefore, some non-linear process such as the induced scattering on thermal ions most probably pumps the beam excited Langmuir waves towards the lower wavenumbers, where the adiabatic ion approximation is justified.

  18. Chorus source region localization in the Earth's outer magnetosphere using THEMIS measurements

    Directory of Open Access Journals (Sweden)

    O. Agapitov

    2010-06-01

    Full Text Available Discrete ELF/VLF chorus emissions, the most intense electromagnetic plasma waves observed in the Earth's radiation belts and outer magnetosphere, are thought to propagate roughly along magnetic field lines from a localized source region near the magnetic equator towards the magnetic poles. THEMIS project Electric Field Instrument (EFI and Search Coil Magnetometer (SCM measurements were used to determine the spatial scale of the chorus source localization region on the day side of the Earth's outer magnetosphere. We present simultaneous observations of the same chorus elements registered onboard several THEMIS spacecraft in 2007 when all the spacecraft were in the same orbit. Discrete chorus elements were observed at 0.15–0.25 of the local electron gyrofrequency, which is typical for the outer magnetosphere. We evaluated the Poynting flux and wave vector distribution and obtained chorus wave packet quasi-parallel propagation to the local magnetic field. Amplitude and phase correlation data analysis allowed us to estimate the characteristic spatial correlation scale transverse to the local magnetic field to be in the 2800–3200 km range.

  19. Methodology to assess the effects of magnetohydrodynamic electromagnetic pulse (MHD-EMP) on power systems

    International Nuclear Information System (INIS)

    Legro, J.R.; Abi-Samra, N.C.; Crouse, J.C.; Tesche, F.M.

    1985-01-01

    This paper summarizes a method to evaluate the possible effects of magnetohydrodynamic-electromagnetic pulse (MHD-EMP) on power systems. This method is based on the approach adapted to study the impact of geomagnetic storms on power systems. The paper highlights the similarities and differences between the two phenomena. Also presented are areas of concern which are anticipated from MHD-EMP on the overall system operation. 12 refs., 1 fig

  20. Empowerment impact assessment (EmpIA), a tool for poverty alleviation and capacity building

    CSIR Research Space (South Africa)

    Louw, MR

    2006-09-01

    Full Text Available their quality of life. xrhombus Facilitate the upgrading of the social and physical environment. xrhombus Increase employment. xrhombus Reduce poverty. xrhombus Stimulate economic growth. xrhombus Reduce imbalances in access to economic opportunities. 1... IMPACT ASSESSMENT (EmpIA), A TOOL FOR POVERTY ALLEVIATION AND CAPACITY BUILDING M.R. LOUW CSIR Built Environment: Pretoria, P.O. Box 395, Pretoria, 0001 ABSTRACT Empowerment impact assessment (EmpIA) is a quantitative...

  1. Assessment and mitigation of electromagnetic pulse (EMP) impacts at short-pulse laser facilities

    International Nuclear Information System (INIS)

    Brown, C G Jr; Bond, E; Clancy, T; Dangi, S; Eder, D C; Ferguson, W; Kimbrough, J; Throop, A

    2010-01-01

    The National Ignition Facility (NIF) will be impacted by electromagnetic pulse (EMP) during normal long-pulse operation, but the largest impacts are expected during short-pulse operation utilizing the Advanced Radiographic Capability (ARC). Without mitigation these impacts could range from data corruption to hardware damage. We describe our EMP measurement systems on Titan and NIF and present some preliminary results and thoughts on mitigation.

  2. Parallelized FDTD simulation for flat-plate bounded wave EMP simulator with lumped terminator

    International Nuclear Information System (INIS)

    Zhu Xiangqin; Chen Weiqing; Chen Zaigao; Cai Libing; Wang Jianguo

    2013-01-01

    A parallelized finite-difference time-domain(FDTD) method for simulating the bounded wave electromagnetic pulse (EMP) simulator with lumped terminator and parallel plate is presented. The effects of several model-parameters on the simulator to the fields in the working volume are simulated and analyzed. The results show that if the width of the lower PEC plate is(or is bigger than)1.5 times that of the upper plate of working volume, the projection length of front transitional section does not have a significant effect on the rise-times of electric fields at the points near the front transitional section, and the rise-times of electric fields at the points near the working volume center decrease as the projection length increases, but the decrement of rise-time decreases. The rise-times of E z at all points also decrease as the lower PEC plate's width increases, but the decrements of rise-time decreases. If the projection length of the front transitional section is fixed, the good results can not be obtained by increasing or decreasing the height of the simulator only, however, which has an optimal value. (authors)

  3. Did high-altitude EMP (electromagnetic pulse) cause the Hawaiian streetlight incident

    Energy Technology Data Exchange (ETDEWEB)

    Vittitoe, C N

    1989-04-01

    Studies of electromagnetic pulse (EMP) effects on civilian and military systems predict results ranging from severe destruction to no damage. Convincing analyses that support either extreme are rare. The Hawaiian streetlight incident associated with the Starfish nuclear burst is the most widely quoted observed damage. We review the streetlight characteristics and estimate the coupling between the Starfish EMP and a particular streetlight circuit identified as one of the few that failed. Evidence indicates that the damage was EMP-generated. The main contributing factors were the azimuthal angle of the circuit relative to the direction of EMP propagation, and the rapid rise of the EMP signal. The azimuthal angle provided coherent buildup of voltage as the EMP swept across the transmission line. The rapid rise allowed substantial excitation before the canceling effects of ground reflections limited the signals. Resulting voltages were at the threshold for causing the observed fuse damage and are consistent with this damage occurring in only some of the strings in the systems. 15 refs., 16 figs., 4 tabs.

  4. Macroinvertebrate distribution and aquatic ecology in the Ruoergai (Zoige) Wetland, the Yellow River source region

    Science.gov (United States)

    Zhao, Na; Xu, Mengzhen; Li, Zhiwei; Wang, Zhaoyin; Zhou, Hanmi

    2017-09-01

    The Ruoergai (Zoige) Wetland, the largest plateau peatland in the world, is located in the Yellow River source region. The discharge of the Yellow River increases greatly after flowing through the Ruoergai Wetland. The aquatic ecosystem of the Ruoergai Wetland is crucial to the whole Yellow River basin. The Ruoergai wetland has three main kinds of water bodies: rivers, oxbow lakes, and marsh wetlands. In this study, macroinvertebrates were used as indicators to assess the aquatic ecological status because their assemblage structures indicate long-term changes in environments with high sensitivity. Field investigations were conducted in July, 2012 and in July, 2013. A total of 72 taxa of macroinvertebrates belonging to 35 families and 67 genera were sampled and identified. Insecta was the dominant group in the Ruoergai Basin. The alpha diversity of macroinvertebrates at any single sampling site was low, while the alpha diversity on a basin-wide scale was much higher. Macroinvertebrate assemblages in rivers, oxbow lakes, and marsh wetlands differ markedly. Hydrological connectivity was a primary factor causing the variance of the bio-community. The river channels had the highest alpha diversity of macroinvertebrates, followed by marsh wetlands and oxbow lakes. The density and biomass of Gastropoda, collector filterers, and scrapers increased from rivers to oxbow lakes and then to marsh wetlands. The river ecology was particular in the Ruoergai Wetland with the high beta diversity of macroinvertebrates, the low alpha diversity of macroinvertebrates, and the low taxa richness, density, and biomass of EPT (Ephemeroptera, Plecoptera, Trichoptera). To maintain high alpha diversity of macroinvertebrates macroinvertebrates in the Ruoergai Wetland, moderate connectivity of oxbow lakes and marsh wetlands with rivers and measures to control headwater erosion are both crucial.

  5. Emp is a component of the nuclear matrix of mammalian cells and undergoes dynamic rearrangements during cell division

    International Nuclear Information System (INIS)

    Bala, Shashi; Kumar, Ajay; Soni, Shivani; Sinha, Sudha; Hanspal, Manjit

    2006-01-01

    Emp, originally detected in erythroblastic islands, is expressed in numerous cell types and tissues suggesting a functionality not limited to hematopoiesis. To study the function of Emp in non-hematopoietic cells, an epitope-tagged recombinant human Emp was expressed in HEK cells. Preliminary studies revealed that Emp partitioned into both the nuclear and Triton X-100-insoluble cytoskeletal fractions in approximately a 4:1 ratio. In this study, we report investigations of Emp in the nucleus. Sequential extractions of interphase nuclei showed that recombinant Emp was present predominantly in the nuclear matrix. Immunofluorescence microscopy showed that Emp was present in typical nuclear speckles enriched with the spliceosome assembly factor SC35 and partially co-localized with actin staining. Coimmunoprecipitation and GST-pull-down assays confirmed the apparent close association of Emp with nuclear actin. During mitosis, Emp was detected at the mitotic spindle/spindle poles, as well as in the contractile ring during cytokinesis. These results suggest that Emp undergoes dynamic rearrangements within the nuclear architecture that are correlated with cell division

  6. The Establishment of Object Selection Criteria for Effect Analysis of Electromagnetic Pulse (EMP) in Operating Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Ye, Song Hae; Ryu, Hosun; Kim, Minyi; Lee, Euijong [KHNP CRI, Daejeon (Korea, Republic of)

    2016-10-15

    The electromagnetic pulse (EMP) can be used as a strategic weapon by inducing damaging voltage and currents that the electrical circuits are not designed to withstand. EMPs are lethal to electronic systems. All EMP events have three common components: a source, coupling path, and receptor. It can also travel across power grids, destroying electronics as it passes in less than a second. There have been no research studies on the effect analysis for EMP in domestic nuclear power plants and power grids. To ensure the safety of operating nuclear power plants in this environment, the emission of EMP is needed for the effect analysis and safety measures against EMPs. Actually, it is difficult and inefficient to conduct the effect analysis of EMP with all the equipment and systems in nuclear power plants (NPPs). Therefore, this paper presents the results of establishing the object selection criteria for the effect analysis of EMP in operating nuclear power plants through reviewing previous research in the US and the safety related design concepts in domestic NPPs. It is not necessary to ensure the continued operation of the plant in intense multiple EMP environments. The most probable effect of EMP on a modern nuclear power plant is an unscheduled shutdown. EMP may also cause an extended shutdown by the unnecessary activation of some safety related systems. In general, EMP can be considered a nuisance to nuclear plants, but it is not considered a serious threat to plant safety. The results of EMP effect analysis show less possibility of failure in the tested individual equipment. It was also confirmed that there is no possibility of simultaneous failure for devices in charge of the safety shutdown in the NPP.

  7. Development of Design Information Template for Nuclear Power Plants for Electromagnetic Pulse (EMP) Effect Analysis

    International Nuclear Information System (INIS)

    Kim, Minyi; Ryu, Hosan; Ye, Songhae; Lee, Euijong

    2016-01-01

    An electromagnetic pulse (EMP) is a transient electromagnetic shock wave that has powerful electric and magnetic fields that can destroy electronic equipment. It is generally well-known that EMPs can cause the malfunction and disorder of electronic equipment and serious damages to electric power systems and communication networks. Research is being carried out to protect nuclear power plants (NPPs) from EMP threats. Penetration routes of EMPs can be roughly categorized into two groups, radioactivity and conductivity. The radioactive effect refers to an impact transmitted to the ground from high-altitude electromagnetic pulses (HEMP). Such an impact may affect target equipment through the point of entry (POE) of the concrete structure of an NPP. The conductive effect refers to induced voltage or current coupled to the NPPs cable structure. The induced voltage and current affect the target equipment via connected cables. All these factors must be considered when taking into account EMP effect analysis for NPPs. To examine all factors, it is necessary to fully understand the schemes of NPPs. This paper presents a four type design information template that can be used to analyze the EMP effect in operating nuclear power plants. In order to analyze of the effects of EMPs on operating NPPs, we must consider both the conductive and radioactive effects on the target (system, equipment, structure). For these reasons, not only the equipment information, but also the information about the structure and the external penetration will be required. We are developing a design information template for robust nuclear design information acquisition. We expect to develop a block diagram on the basis of the template

  8. Development of Design Information Template for Nuclear Power Plants for Electromagnetic Pulse (EMP) Effect Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Minyi; Ryu, Hosan; Ye, Songhae; Lee, Euijong [KNHP CRI, Daejeon (Korea, Republic of)

    2016-10-15

    An electromagnetic pulse (EMP) is a transient electromagnetic shock wave that has powerful electric and magnetic fields that can destroy electronic equipment. It is generally well-known that EMPs can cause the malfunction and disorder of electronic equipment and serious damages to electric power systems and communication networks. Research is being carried out to protect nuclear power plants (NPPs) from EMP threats. Penetration routes of EMPs can be roughly categorized into two groups, radioactivity and conductivity. The radioactive effect refers to an impact transmitted to the ground from high-altitude electromagnetic pulses (HEMP). Such an impact may affect target equipment through the point of entry (POE) of the concrete structure of an NPP. The conductive effect refers to induced voltage or current coupled to the NPPs cable structure. The induced voltage and current affect the target equipment via connected cables. All these factors must be considered when taking into account EMP effect analysis for NPPs. To examine all factors, it is necessary to fully understand the schemes of NPPs. This paper presents a four type design information template that can be used to analyze the EMP effect in operating nuclear power plants. In order to analyze of the effects of EMPs on operating NPPs, we must consider both the conductive and radioactive effects on the target (system, equipment, structure). For these reasons, not only the equipment information, but also the information about the structure and the external penetration will be required. We are developing a design information template for robust nuclear design information acquisition. We expect to develop a block diagram on the basis of the template.

  9. Hospitalidade Organizacional: Panorama Teórico-Empírico

    Directory of Open Access Journals (Sweden)

    José Alberto Carvalho dos Santos Claro

    2015-10-01

    Full Text Available O objetivo deste texto é o de apresentar as discussões teórico-conceituais sobre Hospitalidade, particularmente a vertente da Hospitalidade Organizacional (HO, que se ocupa das relações hospitaleiras no ambiente do espaço de trabalho. Trata-se de um estudo exploratório, baseado em revisão bibliográfica, seguida de pesquisa de campo por meio de levantamento junto a gestores de pessoas (especialistas ou juízes, sobre o entendimento do tema, visando contribuir para a futura criação de escala de medida para quantificar o grau de HO em uma organização. Como resultado, apresenta-se contribuição teórica para o amadurecimento desta tendência organizacional e indicadores que poderão ser futuramente usados em estudos empíricos e na construção de um instrumento com escala validada para ser utilizada em organizações em qualquer setor de atividade econômica. Palavras-chave: Hospitalidade. Hospitalidade Organizacional. Gestão de Pessoas.Organizational Hospitality: Theorical and Empirical Developments This paper aim is to present the theoretical and conceptual discussions about hospitality, particularly the  Organizational Hospitality (OH, which is concerned with the hospitable relations in the workplace. It’s an exploratory study, based on literature review and field survey with people managers (experts or judges about their understanding about the question. The result indicates that the development of organizational indicators could be used in future empirical studies and to the construction of a validated scale that can be used in any sector of the economic activity. Keywords: Hospitality. Organizational Hospitality. People Management. Indicators.José Alberto Carvalho dos Santos Claro – Doutor. Professor Adjunto da Universidade Federal de São Paulo [UNIFESP], Campus Baixada Santista, Santos, SP. Endereço Lattes http://lattes.cnpq.br/0865792662046289 E-mail: albertoclaro@albertoclaro.pro.br  

  10. Studies of Effect Analysis of Electromagnetic Pulses (EMP) in Operating Nuclear Power Plants (NPP)

    Energy Technology Data Exchange (ETDEWEB)

    Ye, Song Hae; Ryu, Ho Sun; Kim, Min Yi; Lee, Eui Jong [KHNP, Daejeon (Korea, Republic of)

    2016-05-15

    The effect analysis of electromagnetic pulses (EMPs) has been studied for the past year by the Central Research Institute of Korea Hydro Nuclear Power Co. (KHNP) in order to better establish safety measures in operating nuclear power plants. What is an electromagnetic pulse (EMP)? As a general term for high-power electromagnetic radiation, it refers to strong electromagnetic pulses that destroy only electronic equipment devices in a short period without loss of life. The effect analysis of EMPs in operating NPPs and their corresponding safety measures in terms of selecting target devices against EMP impact have been examined in this paper. In general, domestic nuclear power plants do apply the design of fail-safe concepts. For example, if key instruments of a system fail because of EMPs, the control rods of a nuclear reactor are dropped automatically in order to maintain safe conditions of the NPP. Reactor cooling presents no problem because the diesel generator will adopt the analog starting circuit least affected by the electromagnetic waves.

  11. sae is essential for expression of the staphylococcal adhesins Eap and Emp.

    Science.gov (United States)

    Harraghy, Niamh; Kormanec, Jan; Wolz, Christiane; Homerova, Dagmar; Goerke, Christiane; Ohlsen, Knut; Qazi, Saara; Hill, Philip; Herrmann, Mathias

    2005-06-01

    Eap and Emp are two Staphylococcus aureus adhesins initially described as extracellular matrix binding proteins. Eap has since emerged as being important in adherence to and invasion of eukaryotic cells, as well as being described as an immunomodulator and virulence factor in chronic infections. This paper describes the mapping of the transcription start point of the eap and emp promoters. Moreover, using reporter-gene assays and real-time PCR in defined regulatory mutants, environmental conditions and global regulators affecting expression of eap and emp were investigated. Marked differences were found in expression of eap and emp between strain Newman and the 8325 derivatives SH1000 and 8325-4. Moreover, both genes were repressed in the presence of glucose. Analysis of expression of both genes in various regulatory mutants revealed that sarA and agr were involved in their regulation, but the data suggested that there were additional regulators of both genes. In a sae mutant, expression of both genes was severely repressed. sae expression was also reduced in the presence of glucose, suggesting that repression of eap and emp in glucose-containing medium may, in part, be a consequence of a decrease in expression of sae.

  12. Energy coupling of nuclear bursts in and above the ocean surface: source region calculations and experimental validation

    International Nuclear Information System (INIS)

    Clarke, D.B.; Harben, P.E.; Rock, D.W.; White, J.W.; Piacsek, A.

    1997-01-01

    In support of the Comprehensive Test Ban, research is under way on the long range propagation of signals from nuclear explosions in deep underwater sound (SOFAR) channel. Initially our work at LLNL on signals in the source region considered explosions in or above deep ocean. We studied the variation of wave properties and source region energy coupling as a function of height or depth of burst. Initial calculations on the CALE hydrodynamics code were linked at a few hundred milliseconds to a version of NRL's weak code, NPE, which solves the nonlinear progressive wave equation. The simulation of the wave propagation was carried down to 5000 m depth and out to 10,000 m range. We have completed ten such simulations at a variety of heights and depths below the ocean surface

  13. Transparência e Replicabilidade na Pesquisa Empírica em Direito: conceitos e ferramentas

    OpenAIRE

    Oliveira, Paulo

    2018-01-01

    Com o crescimento das pesquisas empíricas em Direito quais as práticas devem ser adotadas pelos pesquisadores para acompanhar o Padrão Ouro da pesquisa? Quais os conceitos necessários para que a Pesquisa Empírica possa crescer de forma sustentável e democrática? Esse artigo tenta delinear alguns conceitos importantes da Ciência 2.0 e mostra algumas das principais ferramentas para atingir plenamente o ideal de Ciência Aberta.

  14. Transistor collector breakdown in the presence of conducted EMP and gamma radiation

    International Nuclear Information System (INIS)

    Rice, D.H.

    1975-01-01

    In this paper we develop expressions which describe breakdown, negative resistance and latch characteristics for a common emitter transistor when exposed to simultaneous conducted EMP and ionizing radiation. These expressions are derived from a modified Ebers-Moll model and show that common emitter breakdown voltage is reduced, latch (or sustaining voltage) remains unchanged, and that the negative resistance characteristics are changed. Using the modified Ebers-Moll model good agreement between predicted and observed circuit response is demonstrated when the circuits are exposed to a rising collector voltage (due to EMP) and simultaneous ionizing (gamma) radiation

  15. Parasites causing cerebral falciparum malaria bind multiple endothelial receptors and express EPCR and ICAM-1-binding PfEMP1

    DEFF Research Database (Denmark)

    Tuikue Ndam, Nicaise; Moussiliou, Azizath; Lavstsen, Thomas

    2017-01-01

    Background: Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) mediates the binding and accumulation of infected erythrocytes (IE) to blood vessels and tissues. Specific interactions have been described between PfEMP1 and human endothelial proteins CD36, intercellular adhesion molecule-1...

  16. Single particle analysis of eastern Mediterranean aerosol particles: Influence of the source region on the chemical composition

    Science.gov (United States)

    Clemen, Hans-Christian; Schneider, Johannes; Köllner, Franziska; Klimach, Thomas; Pikridas, Michael; Stavroulas, Iasonas; Sciare, Jean; Borrmann, Stephan

    2017-04-01

    The Mediterranean region is one of the most climatically sensitive areas and is influenced by air masses of different origin. Aerosol particles are one important factor contributing to the Earth's radiative forcing, but knowledge about their composition and sources is still limited. Here, we report on results from the INUIT-BACCHUS-ACTRIS campaign, which was conducted at the Cyprus Atmospheric Observatory (CAO, Agia Marina Xyliatou) in Cyprus in April 2016. Our results show that the chemical composition of the aerosol particles in the eastern Mediterranean is strongly dependent on their source region. The composition of particles in a size range between 150 nm and 3 μm was measured using the Aircraft-based Laser ABlation Aerosol MAss spectrometer (ALABAMA), which is a single particle laser ablation instrument using a bipolar time-of-flight mass spectrometer. The mass spectral information on cations and anions allow for the analysis of different molecular fragments. The information about the source regions results from backward trajectories using HYSPLIT Trajectory Model (Trajectory Ensemble) on hourly basis. To assess the influence of certain source regions on the air masses arriving at CAO, we consider the number of trajectories that crossed the respective source region within defined time steps. For a more detailed picture also the height and the velocity of the air masses during their overpass above the source regions will be considered. During the campaign at CAO in April 2016 three main air mass source regions were observed: 1) Northern Central Europe, likely with an enhanced anthropogenic influence (e.g. sulfate and black carbon from combustion processes, fly ash particles from power plants, characterized by Sr and Ba), 2) Southwest Europe, with a higher influence of the Mediterranean Sea including sea salt particles (characterized by, e.g., NaxCly, NaClxNOy), 3) Northern Africa/Sahara, with air masses that are expected to have a higher load of mineral dust

  17. The development of the time dependence of the nuclear EMP electric field

    International Nuclear Information System (INIS)

    Eng, C.

    2009-01-01

    The nuclear electromagnetic pulse (EMP) electric field calculated with the legacy code CHAP is compared with the field given by an integral solution of Maxwell's equations, also known as the Jefimenko equation, to aid our current understanding on the factors that affect the time dependence of the EMP. For a fair comparison the CHAP current density is used as a source in the Jefimenko equation. At first, the comparison is simplified by neglecting the conduction current and replacing the standard atmosphere with a constant density air slab. The simplicity of the resultant current density aids in determining the factors that affect the rise, peak and tail of the EMP electric field versus time. The three dimensional nature of the radiating source, i.e. sources off the line-of-sight, and the time dependence of the derivative of the current density with respect to time are found to play significant roles in shaping the EMP electric field time dependence. These results are found to hold even when the conduction current and the standard atmosphere are properly accounted for. Comparison of the CHAP electric field with the Jefimenko electric field offers a direct validation of the high-frequency/outgoing wave approximation.

  18. Bayesian Analysis for EMP Survival Probability of Solid State Relay

    International Nuclear Information System (INIS)

    Sun Beiyun; Zhou Hui; Cheng Xiangyue; Mao Congguang

    2009-01-01

    The principle to estimate the parameter p of binomial distribution by Bayesian method and the several non-informative prior are introduced. The survival probability of DC solid state relay under current injection at certain amplitude is obtained by this method. (authors)

  19. Gel shift analysis of the empA promoter region in Vibrio anguillarum

    Directory of Open Access Journals (Sweden)

    Denkin Steven M

    2004-10-01

    Full Text Available Abstract Background The induction of metalloprotease encoded by empA in Vibrio anguillarum occurs at high cell density in salmon intestinal mucus. Previously we have shown that there are significant differences in empA expression in two strains of V. anguillarum, M93Sm and NB10. It is hypothesized that differences in empA regulation are due to differences in binding of regulatory elements. Results Two strains of V. anguillarum, M93Sm and NB10, were examined and compared for the presence of DNA regulatory proteins that bind to and control the empA promoter region. Gel mobility shift assays, using a digoxigenin (DIG-labeled oligomer containing a lux box-like element and the promoter for empA, were done to demonstrate the presence of a DNA-binding protein. Protein extracts from NB10 cells incubated in Luria Bertani broth + 2% NaCl (LB20, nine salts solution + 200 μg/ml mucus (NSSM, 3M (marine minimal medium, or NSS resulted in a gel mobility shift. No gel mobility shift was seen when protein extracts from either LB20- or NSSM-grown M93Sm cells were mixed with the DIG-labeled empA oligomer. The azocasein assay detected protease activity in all incubation conditions for NB10 culture supernatants. In contrast, protease activity was detected in M93Sm culture supernatants only when incubated in NSSM. Since the luxR homologue in V. anguillarum, vanT, has been cloned, sequenced, and shown to be required for protease activity, we wanted to determine if vanT mutants of NB10 exhibit the same gel shift observed in the wild-type. Site-directed mutagenesis was used to create vanT mutants in V. anguillarum M93Sm and NB10 to test whether VanT is involved with the gel mobility shift. Both vanT mutants, M02 and NB02, did not produce protease activity in any conditions. However, protein extracts from NB02 incubated in each condition still exhibited a gel shift when mixed with the DIG-labeled empA oligomer. Conclusions The data demonstrate that protein extracts of V

  20. Prediction of EMP cavitation threshold from other than sodium testing

    International Nuclear Information System (INIS)

    Kambe, M.; Kamei, M.

    2002-01-01

    An experimental study has been performed to predict the cavitation threshold of electromagnetic pumps from measurements on test models using water and alcohol. Cavitation tests were carried out using water and alcohol test loop on subscale ducts of transparent acrylic resin with reference to an actual pump (1.1m 3 /min). These data were compared to those obtained from the in-sodium tests on the actual pump. The investigation revealed that the value of Thoma's dimensionless parameter: σ applied to the test model for water and alcohol is quite higher than that of corresponding σ on the actual pump. To minimize the incipient cavitation safety margin, more accurate prediction must be required. In view of this, the authors proposed the dimensionless parameter: σ T =σ/W-bare where W-bare denotes the Weber number. This parameter was confirmed to predict the cavitation threshold of electromagnetic pumps with much more accuracy than ever before. It can also be adopted to predict cavitation threshold of other FBR components. (author)

  1. Analysis of source regions and meteorological factors for the variability of spring PM10 concentrations in Seoul, Korea

    Science.gov (United States)

    Lee, Jangho; Kim, Kwang-Yul

    2018-02-01

    CSEOF analysis is applied for the springtime (March, April, May) daily PM10 concentrations measured at 23 Ministry of Environment stations in Seoul, Korea for the period of 2003-2012. Six meteorological variables at 12 pressure levels are also acquired from the ERA Interim reanalysis datasets. CSEOF analysis is conducted for each meteorological variable over East Asia. Regression analysis is conducted in CSEOF space between the PM10 concentrations and individual meteorological variables to identify associated atmospheric conditions for each CSEOF mode. By adding the regressed loading vectors with the mean meteorological fields, the daily atmospheric conditions are obtained for the first five CSEOF modes. Then, HYSPLIT model is run with the atmospheric conditions for each CSEOF mode in order to back trace the air parcels and dust reaching Seoul. The K-means clustering algorithm is applied to identify major source regions for each CSEOF mode of the PM10 concentrations in Seoul. Three main source regions identified based on the mean fields are: (1) northern Taklamakan Desert (NTD), (2) Gobi Desert and (GD), and (3) East China industrial area (ECI). The main source regions for the mean meteorological fields are consistent with those of previous study; 41% of the source locations are located in GD followed by ECI (37%) and NTD (21%). Back trajectory calculations based on CSEOF analysis of meteorological variables identify distinct source characteristics associated with each CSEOF mode and greatly facilitate the interpretation of the PM10 variability in Seoul in terms of transportation route and meteorological conditions including the source area.

  2. Evasion of immunity to Plasmodium falciparum malaria by IgM masking of protective IgG epitopes in infected erythrocyte surface-exposed PfEMP1

    DEFF Research Database (Denmark)

    Barfod, Lea; Dalgaard, Michael B; Pleman, Suzan T

    2011-01-01

    1 (PfEMP1) family is central to both. Here, we present evidence of a P. falciparum evasion mechanism not previously documented: the masking of PfEMP1-specific IgG epitopes by nonspecific IgM. Nonspecific IgM binding to erythrocytes infected by parasites expressing the PfEMP1 protein VAR2CSA...

  3. Mapping the transcription start points of the Staphylococcus aureus eap, emp, and vwb promoters reveals a conserved octanucleotide sequence that is essential for expression of these genes.

    Science.gov (United States)

    Harraghy, Niamh; Homerova, Dagmar; Herrmann, Mathias; Kormanec, Jan

    2008-01-01

    Mapping the transcription start points of the eap, emp, and vwb promoters revealed a conserved octanucleotide sequence (COS). Deleting this sequence abolished the expression of eap, emp, and vwb. However, electrophoretic mobility shift assays gave no evidence that this sequence was a binding site for SarA or SaeR, known regulators of eap and emp.

  4. Dispersion in North Atlantic Deep Water transfer between the northern source region and the South Atlantic

    Energy Technology Data Exchange (ETDEWEB)

    Huhn, Oliver; Roether, Wolfgang [Institut fuer Umweltphysik, Universitaet Bremen (Germany)

    2007-07-01

    North Atlantic Deep Water (NADW) represents the Atlantic part of the deep, southward return arm of the oceanic 'conveyor belt', which moderates Europe's climate and effects most of the water transfer from the ocean surface into the deep waters globally. The transfer starts from the NADW formation regions, which in the case of upper NADW (approx. 1500-2000 m depth) is the Labrador Sea (far NW Atlantic). NADW is found concentrated toward the continental slope of the Americas, but subject to meandering, and to recirculation into, and mixing with, the waters of the interior Atlantic. Individual water parcels thus follow a complex ensemble of trajectories. We have obtained characteristics of that ensemble by fitting the free parameters of a suitable function using extensive observations of the transient tracers CFC-11, CFC-12, CCl{sub 4}, and tritium. A tracer transfer function of ocean-surface concentrations to those in newly formed NADW was derived as a precursory step. In the upper NADW we obtain RMS transfer-time dispersions on the way from the Labrador Sea of 31 years at 6 N rising to 53 years at 20 S, compared to mean transfer times ranging 46 to 79 years ({+-}20 %); furthermore, approximately 10 % to 40 % of the water is old, tracer-free water admixed on the way. Similar results have been obtained for lower NADW (approx. 2500-4000 m). The combination of tritium and CFC observations is particularly suited to constrain the dispersion, since it acts on the concentrations of these tracers in an opposite way. The tracer-adjusted transfer functions allow quantification of the NADW transport of pollutants and other compounds delivered to the NADW formation region. The results can furthermore check mean transfer times and large-scale dispersion of the NADW part of dynamic ocean circulation models.

  5. Change of the Asian dust source region deduced from the composition of anthropogenic radionuclides in surface soil in Mongolia

    Directory of Open Access Journals (Sweden)

    Y. Igarashi

    2011-07-01

    Full Text Available Recent climate change, especially during the 2000s, may be the primary reason for the expansion of the Asian dust source region. The change in the dust source region was investigated by examining anthropogenic radionuclides contained in surface soil samples from Mongolia. Surface soil was globally labeled by radioactive fallout from nuclear testing during the late 1950s and early 1960s, but there are no current direct sources for anthropogenic radionuclides in the air (before the Fukushima nuclear power plant accident in 2011. Radionuclides in the atmosphere are therefore carried mainly by wind-blown dust from surface soil, that is, aeolian dust. Asian dust carries traces of 90Sr, 137Cs, and other anthropogenic radionuclides; the heaviest deposition occurs in spring and has been recorded in Japan since the early 1990s. The composition of anthropogenic radionuclides in atmospheric depositions would be affected by a change in the dust source. Previous studies of atmospheric deposition at long-term monitoring sites (e.g. in Tsukuba, Japan have detected changes in the 137Cs/90Sr ratio and in the specific activity of the radionuclides. These changes in the composition of observed atmospheric depositions are supposed to reflect changes in the climatic conditions of the dust source region. To investigate this dust source change, we conducted a field survey of radionuclides (90Sr and 137Cs in surface soil samples in September 2007 in the eastern and southern regions of Mongolia, where dust storms have occurred more frequently since 2000. The specific activities of both radionuclides as well as the 137Cs/90Sr ratio in the surface soil were well correlated with annual average precipitation in the Mongolian desert-steppe zone. Higher specific activities and a higher 137Cs/90Sr ratio were found in grassland regions that experienced greater

  6. Feasibility of Isolating Vulnerable Equipment of the Electric Power System from Sources of EMP

    Science.gov (United States)

    1978-03-01

    is reclosed after the fault is cleared, the reclosure will probably be successful since no permanent conducting path for current exists. However...successive EMP-induced faults may cause reclosing circuit breakers and reclosers to lock out. 2. Lock out of reclosers and reclosing circuit breakers...Most distribution lines are protected by some sort of device that recloses the line after a fault is cleared. All such devices have a common

  7. Exploring the SDSS Data Set with Linked Scatter Plots. I. EMP, CEMP, and CV Stars

    Energy Technology Data Exchange (ETDEWEB)

    Carbon, Duane F.; Henze, Christopher; Nelson, Bron C., E-mail: Duane.F.Carbon@nasa.gov [NASA Ames Research Center, NASA Advanced Supercomputing Facility, Moffett Field, CA, 94035-1000 (United States)

    2017-02-01

    We present the results of a search for extremely metal-poor (EMP), carbon-enhanced metal-poor (CEMP), and cataclysmic variable (CV) stars using a new exploration tool based on linked scatter plots (LSPs). Our approach is especially designed to work with very large spectrum data sets such as the SDSS, LAMOST, RAVE, and Gaia data sets, and it can be applied to stellar, galaxy, and quasar spectra. As a demonstration, we conduct our search using the SDSS DR10 data set. We first created a 3326-dimensional phase space containing nearly 2 billion measures of the strengths of over 1600 spectral features in 569,738 SDSS stars. These measures capture essentially all the stellar atomic and molecular species visible at the resolution of SDSS spectra. We show how LSPs can be used to quickly isolate and examine interesting portions of this phase space. To illustrate, we use LSPs coupled with cuts in selected portions of phase space to extract EMP stars, CEMP stars, and CV stars. We present identifications for 59 previously unrecognized candidate EMP stars and 11 previously unrecognized candidate CEMP stars. We also call attention to 2 candidate He ii emission CV stars found by the LSP approach that have not yet been discussed in the literature.

  8. Role of Off-Line-of-Sight Propagation in Geomagnetic EMP Formation

    Energy Technology Data Exchange (ETDEWEB)

    Kruger, Hans W. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2016-05-23

    The author’s synchrotron radiation based 3D geomagnetic EMP code MACSYNC has been used to explore the impact on pulse rise time and air conductivity of EMP propagation paths to the observer that are located off the direct line-of-sight (LOS) between gamma source and observer. This geometry is always present because, for an isotropic source, most the gammas are emitted at an angle with respect to the LOS. Computations for a 1 kt near-surface burst observed from space yield two principal findings: 1. The rise time is generated by the combined actions of a) electron spreading along the LOS due to the Compton electron emission angular distribution folded with electron multiple scattering effects, and b) radiation arrival time spreading due to length differences for different off-LOS propagation paths. The pulse rise time does not depend on the rise time of the conductivity. The conductivity rise time determines the pulse amplitude. 2. One-dimensional legacy EMP codes are inherently incapable of producing the correct pulse shape because they cannot treat the dependence of the conductivity on two dimensions, i.e. the radius from the source and the angle of the propagation path with the LOS. This divergence from one-dimensionality begins at a small fraction of a nanosecond for a sea-level burst. This effect will also be present in high-altitude bursts, however, determination of its onset time and magnitude requires high-altitude computations which have not yet been done.

  9. Report of the Commission to Assess the Threat to the United States from Electromagnetic Pulse (EMP) Attack: Critical National Infrastructures

    National Research Council Canada - National Science Library

    Foster, Jr., John S; Gjelde, Earl; Graham, William R; Hermann, Robert J; Kluepfel, Henry M; Lawson, Richard L; Soper, Gordon K; Wood, Lowell L; Woodard, Joan B

    2008-01-01

    ...) attack on our critical national infrastructures. An earlier report, Report of the Commission to Assess the Threat to the United States from Electromagnetic Pulse (EMP), Volume 1: Executive Report (2004...

  10. Geochemical evidence on the source regions of Tibetan Plateau dusts during non-monsoon period in 2008/09

    Science.gov (United States)

    Li, C.; Kang, S.; Zhang, Q.; Gao, S.

    2012-12-01

    Geochemical characteristics, source regions and related transport patterns of dust over the Tibetan Plateau (TP) are still unclear. To address these issues, major (Na, Mg, Al, K and Ca), trace (e.g. Li, Cr, Ni, As, Cd, Cs, Pb and U) and rare earth elements of dust samples from five snow-pits over the TP and its fringe areas during the non-monsoon period in 2008/2009 were analyzed. The results indicate that rare earth element compositions of snow-pit dust are similar to those of the upper continental crust. Enrichment factors of all the elements of snow-pit dust are identical to those of the pollution elements (e.g. Cu and Ni) and elements like Li, As and Cs that are concentrated in surface soils. In contrast, concentrations of some typical pollution elements (e.g. Cr and Cd) of snow pit dust are lower than those of dusts derived from the Sahara Desert and the Thar Desert surrounding the TP. Additionally, the compositions of rare earth elements and high field strength elements (Hf, Zr and Nb) of snow-pit dust are also similar to those of surface soils and different from dusts of these two deserts. The combined evidence, including dust transport patterns around the TP, supports the conclusion that the TP itself is the main source region of snow-pit dusts of the inner TP. It is unlikely that those particle-bound pollutants are transported into the TP from outside sources during the non-monsoon period. Ratios of Ce/Sm against Eu/Sm for the snow-pit dust, fine dust from the Sahara desert (A), and ratios of Ce/Er against Eu/Er for the snow-pit dust, fine dust from the Thar Desert (B). Dust from Sahasa cannot penetrate into the TP and transport only along the Himalayas at south and the Tianshan at north due to their high elevation

  11. Source region and sector contributions of atmospheric soot particle in a coalfield region of Dhanbad, eastern part of India

    Science.gov (United States)

    Singh, S.; Tiwari, S.; Dumka, U. C.; Kumar, R.; Singh, P. K.

    2017-11-01

    Black carbon (BC) aerosols affect the Earth's climate directly by interacting with the solar radiation and indirectly by modifying the lifetime and optical properties of clouds. However, our understanding of BC aerosols and their impacts on the climate are limited by lack of in situ measurements of BC, especially in the developing world. This study reports measurements of BC from Dhanbad, a coalfields area of eastern India, we analyze BC data at 370 and 880 nm during 2013 to gain insight into the emission sources affecting the study area. Our analysis indicates significantly higher absorption at the lower wavelength (ultraviolet). We estimate that 33% of BC at Dhanbad comes from biomass/biofuel combustion and the remaining 67% from the fossil fuel combustion. Higher concentrations of BC370 nm (> 12 μg m- 3) were observed when the air masses affecting Dhanbad originated far away in countries like Iran, Afghanistan, Pakistan, Oman, United Arab Emirates and passed over the Indo-Gangetic Plains (IGP) prior to arriving at the observation site. The source regions affecting BC880 nm were localized over the IGP but BC880 nm concentrations are 33% lower ( 8 μg m- 3) than BC370 nm. The cluster analysis showed that the largest fraction (35 and 29%) of the air masses arriving at Dhanbad passed through the boundary layer of the central IGP and north-west IGP region during the post-monsoon season. Average values of BC370 nm (16.0 and 20.0 μg m- 3) and BC880 nm (9.5 and 10.0 μg m- 3) in the IGP influenced air masses were significantly higher than those arriving from other source regions. The Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) model were applied to understand the relative importance of different sources affecting Dhanbad. The variability of observed BC mass concentrations was captured fairly well by WRF-Chem with minor deviations from the measured values. Model results indicate that anthropogenic emissions account for more than 75% of the

  12. A method for visualizing surface-exposed and internal PfEMP1 adhesion antigens in Plasmodium falciparum infected erythrocytes

    Directory of Open Access Journals (Sweden)

    Arnot David E

    2008-06-01

    Full Text Available Abstract Background The insertion of parasite antigens into the host erythrocyte membrane and the structure and distribution of Plasmodium falciparum adhesion receptors on that membrane are poorly understood. Laser scanning confocal microscopy (LSCM and a novel labelling and fixation method have been used to obtain high resolution immuno-fluorescent images of erythrocyte surface PfEMP1 and internal antigens which allow analysis of the accumulation of PfEMP1 on the erythrocyte membrane during asexual development. Methods A novel staining technique has been developed which permits distinction between erythrocyte surface PfEMP1 and intracellular PfEMP1, in parasites whose nuclear material is exceptionally well resolved. Primary antibody detection by fluorescence is carried out on the live parasitized erythrocyte. The surface labelled cells are then fixed using paraformaldehyde and permeabilized with a non-ionic detergent to permit access of antibodies to internal parasite antigens. Differentiation between surface and internal antigens is achieved using antibodies labelled with different fluorochromes and confocal microscopy Results Surface exposed PfEMP1 is first detectable by antibodies at the trophozoite stage of intracellular parasite development although the improved detection method indicates that there are differences between different laboratory isolates in the kinetics of accumulation of surface-exposed PfEMP1. Conclusion A sensitive method for labelling surface and internal PfEMP1 with up to three different fluorochromes has been developed for laser scanning confocal optical microscopy and the analysis of the developmental expression of malaria adhesion antigens.

  13. AN ANOMALOUS COMPOSITION IN SLOW SOLAR WIND AS A SIGNATURE OF MAGNETIC RECONNECTION IN ITS SOURCE REGION

    Energy Technology Data Exchange (ETDEWEB)

    Zhao, L.; Landi, E.; Lepri, S. T.; Kocher, M.; Zurbuchen, T. H.; Fisk, L. A.; Raines, J. M., E-mail: lzh@umich.edu [Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109 (United States)

    2017-01-01

    In this paper, we study a subset of slow solar winds characterized by an anomalous charge state composition and ion temperatures compared to average solar wind distributions, and thus referred to as an “Outlier” wind. We find that although this wind is slower and denser than normal slow wind, it is accelerated from the same source regions (active regions and quiet-Sun regions) as the latter and its occurrence rate depends on the solar cycle. The defining property of the Outlier wind is that its charge state composition is the same as that of normal slow wind, with the only exception being a very large decrease in the abundance of fully charged species (He{sup 2+}, C{sup 6+}, N{sup 7+}, O{sup 8+}, Mg{sup 12+}), resulting in a significant depletion of the He and C element abundances. Based on these observations, we suggest three possible scenarios for the origin of this wind: (1) local magnetic waves preferentially accelerating non-fully stripped ions over fully stripped ions from a loop opened by reconnection; (2) depleted fully stripped ions already contained in the corona magnetic loops before they are opened up by reconnection; or (3) fully stripped ions depleted by Coulomb collision after magnetic reconnection in the solar corona. If any one of these three scenarios is confirmed, the Outlier wind represents a direct signature of slow wind release through magnetic reconnection.

  14. Study on the Method of Grass Yield Model in the Source Region of Three Rivers with Multivariate Data

    International Nuclear Information System (INIS)

    You, Haoyan; Luo, Chengfeng; Liu, Zhengjun; Wang, Jiao

    2014-01-01

    This paper uses remote sensing and GIS technology to analyse the Source Region of Three Rivers (SRTR) to establish a grass yield estimation model during 2010 with remote sensing data, meteorological data, grassland type data and ground measured data. Analysis of the correlation between ground measured data, vegetation index based HJ-1A/B satellite data, meteorological data and grassland type data were used to establish the grass yield model. The grass yield model was studied by several statistical methods, such as multiple linear regression and Geographically Weighted Regression (GWR). The model's precision was validated. Finally, the best model to estimate the grass yield of Maduo County in SRTR was contrasted with the TM degraded grassland interpretation image of Maduo County from 2009. The result shows that: (1) Comparing with the multiple linear regression model, the GWR model gave a much better fitting result with the quality of fit increasing significantly from less than 0.3 to more than 0.8; (2) The most sensitive factors affecting the grass yield in SRTR were precipitation from May to August and drought index from May to August. From calculation of the five vegetation indices, MSAVI fitted the best; (3) The Maduo County grass yield estimated by the optimal model was consistent with the TM degraded grassland interpretation image, the spatial distribution of grass yield in Maduo County for 2010 showed a ''high south and low north'' pattern

  15. SOURCE REGIONS OF THE TYPE II RADIO BURST OBSERVED DURING A CME–CME INTERACTION ON 2013 MAY 22

    International Nuclear Information System (INIS)

    Mäkelä, P.; Reiner, M. J.; Akiyama, S.; Gopalswamy, N.; Krupar, V.

    2016-01-01

    We report on our study of radio source regions during the type II radio burst on 2013 May 22 based on direction-finding analysis of the Wind /WAVES and STEREO /WAVES (SWAVES) radio observations at decameter–hectometric wavelengths. The type II emission showed an enhancement that coincided with the interaction of two coronal mass ejections (CMEs) launched in sequence along closely spaced trajectories. The triangulation of the SWAVES source directions posited the ecliptic projections of the radio sources near the line connecting the Sun and the STEREO-A spacecraft. The WAVES and SWAVES source directions revealed shifts in the latitude of the radio source, indicating that the spatial location of the dominant source of the type II emission varies during the CME–CME interaction. The WAVES source directions close to 1 MHz frequencies matched the location of the leading edge of the primary CME seen in the images of the LASCO/C3 coronagraph. This correspondence of spatial locations at both wavelengths confirms that the CME–CME interaction region is the source of the type II enhancement. Comparison of radio and white-light observations also showed that at lower frequencies scattering significantly affects radio wave propagation.

  16. Integrated Verification Experiment data collected as part of the Los Alamos National Laboratory's Source Region Program

    Energy Technology Data Exchange (ETDEWEB)

    Whitaker, R.W.; Noel, S.D.

    1992-12-01

    The summary report by Tom Weaver gives the overall background for the series of IVE (Integrated Verification Experiment) experiments including information on the full set of measurements made. This appendix presents details of the infrasound data for the and discusses certain aspects of a few special experiments. Prior to FY90, the emphasis of the Infrasound Program was on underground nuclear test (UGT) detection and yield estimation. During this time the Infrasound Program was a separate program at Los Alamos, and it was suggested to DOE/OAC that a regional infrasound network be established around NTS. The IVE experiments took place in a time frame that allowed simultaneous testing of possible network sites and examination of propagation in different directions. Whenever possible, infrasound stations were combined with seismic stations so that a large number could be efficiently fielded. The regional infrasound network was not pursued by DOE, as world events began to change the direction of verification toward non-proliferation. Starting in FY90 the infrasound activity became part of the Source Region Program which has a goal of understanding how energy is transported from the UGT to a variety of measurement locations.

  17. Assessment on the Effect of Climate Change on Streamflow in the Source Region of the Yangtze River, China

    Directory of Open Access Journals (Sweden)

    Huanqing Bian

    2017-01-01

    Full Text Available Tuotuo River basin, known as the source region of the Yangtze River, is the key area where the impact of climate change has been observed on many of the hydrological processes of this central region of the Tibetan Plateau. In this study, we examined six Global Climate Models (GCMs under three Representative Concentration Pathways (RCPs scenarios. First, the already impacted climate change was analyzed, based on the historical data available and then, the simulation results of the GCMs and RCPs were used for future scenario assessments. Results indicated that the annual mean temperature will likely be increased, ranging from −0.66 °C to 6.68 °C during the three future prediction periods (2020s, 2050s and 2080s, while the change in the annual precipitation ranged from −1.18% to 66.14%. Then, a well-known distributed hydrological soil vegetation model (DHSVM was utilized to evaluate the effects of future climate change on the streamflow dynamics. The seasonal mean streamflows, predicted by the six GCMs and the three RCPs scenarios, were also shown to likely increase, ranging from −0.52% to 22.58%. Watershed managers and regulators can use the findings from this study to better implement their conservation practices in the face of climate change.

  18. Assessment of climate change impact on hydrological extremes in two source regions of the Nile River Basin

    Directory of Open Access Journals (Sweden)

    M. T. Taye

    2011-01-01

    Full Text Available The potential impact of climate change was investigated on the hydrological extremes of Nyando River and Lake Tana catchments, which are located in two source regions of the Nile River basin. Climate change scenarios were developed for rainfall and potential evapotranspiration (ETo, considering 17 General Circulation Model (GCM simulations to better understand the range of possible future change. They were constructed by transferring the extracted climate change signals to the observed series using a frequency perturbation downscaling approach, which accounts for the changes in rainfall extremes. Projected changes under two future SRES emission scenarios A1B and B1 for the 2050s were considered. Two conceptual hydrological models were calibrated and used for the impact assessment. Their difference in simulating the flows under future climate scenarios was also investigated.

    The results reveal increasing mean runoff and extreme peak flows for Nyando catchment for the 2050s while unclear trend is observed for Lake Tana catchment for mean volumes and high/low flows. The hydrological models for Lake Tana catchment, however, performed better in simulating the hydrological regimes than for Nyando, which obviously also induces a difference in the reliability of the extreme future projections for both catchments. The unclear impact result for Lake Tana catchment implies that the GCM uncertainty is more important for explaining the unclear trend than the hydrological models uncertainty. Nevertheless, to have a better understanding of future impact, hydrological models need to be verified for their credibility of simulating extreme flows.

  19. Evaluating the pacemaker effect with the pump parameter of gated blood-pool imaging

    International Nuclear Information System (INIS)

    Cheng Muhua

    1995-01-01

    13 normal controls and 27 patients with ventricular pacemaker had undergone planar gated blood-pool imaging in different conditions. Result shows: (1) Pump parameters can successfully reflect therapeutic effect of pacemaker among them EMP is the most valuable parameter for evaluating the cardiac pumping effect. (2) After implantation of the ventricular pacemaker, the LVEF did not increase, but the CO and EMP was significantly increased. (3) Compared with right ventricular demand pacemaker, the rate-responsive ventricular pacemaker give better hemodynamic benefit at exercise condition. (4) Through restrained cardiac pacemaker the functional change was analyzed on or off pace, and monitoring the cardiac function itself after the pacemaker was implanted

  20. Determining the source region of auroral emissions in the prenoon oval using coordinated Polar BEAR UV-imaging and DMSP particle measurements

    Science.gov (United States)

    Newell, Patrick T.; Meng, CHING-I.; Huffman, Robert E.

    1992-01-01

    The Polar Beacon Experiment and Auroral Research (Polar BEAR) satellite included the capability for imaging the dayside auroral oval in full sunlight at several wavelengths. Particle observations from the DMSP F7 satellite during dayside auroral oval crossings are compared with approximately simultaneous Polar BEAR 1356-A images to determine the magnetospheric source region of the dayside auroral oval. The source region is determined from the DMSP particle data, according to recent work concerning the classification and identification of precipitation source regions. The close DMSP/Polar BEAR coincidences all occur when the former satellite is located between 0945 and 1000 MLT. Instances of auroral arcs mapping to each of several different regions, including the boundary plasma sheet, the low-latitude boundary layer, and the plasma mantle were found. It was determined that about half the time the most prominent auroral arcs are located at the interfaces between distinct plasma regions, at least at the local time studied here.

  1. EMP Attachment 3 DOE-SC PNNL Site Dose Assessment Guidance

    Energy Technology Data Exchange (ETDEWEB)

    Snyder, Sandra F.

    2011-12-21

    This Dose Assessment Guidance (DAG) describes methods to use to determine the Maximally-Exposed Individual (MEI) location and to estimate dose impact to that individual under the U.S. Department of Energy Office of Science (DOE-SC) Pacific Northwest National Laboratory (PNNL) Site Environmental Monitoring Plan (EMP). This guidance applies to public dose from radioactive material releases to the air from PNNL Site operations. This document is an attachment to the Pacific Northwest National Laboratory (PNNL) Environmental Monitoring Plan (EMP) and describes dose assessment guidance for radiological air emissions. The impact of radiological air emissions from the U.S. Department of Energy Office of Science (DOE-SC) PNNL Site is indicated by dose estimates to a maximally exposed member of the public, referred to as the maximally exposed individual (MEI). Reporting requirements associated with dose to members of the public from radiological air emissions are in 40 CFR Part 61.94, WAC 246-247-080, and DOE Order 458.1. The DOE Order and state standards for dose from radioactive air emissions are consistent with U.S. Environmental Protection Agency (EPA) dose standards in 40 CFR 61.92 (i.e., 10 mrem/yr to a MEI). Despite the fact that the current Contract Requirements Document (CRD) for the DOE-SC PNNL Site operations does not include the requirement to meet DOE CRD 458.1, paragraph 2.b, public dose limits, the DOE dose limits would be met when EPA limits are met.

  2. Quantifying the streamflow response to frozen ground degradation in the source region of the Yellow River within the Budyko framework

    Science.gov (United States)

    Wang, Taihua; Yang, Hanbo; Yang, Dawen; Qin, Yue; Wang, Yuhan

    2018-03-01

    The source region of the Yellow River (SRYR) is greatly important for water resources throughout the entire Yellow River Basin. Streamflow in the SRYR has experienced great changes over the past few decades, which is closely related to the frozen ground degradation; however, the extent of this influence is still unclear. In this study, the air freezing index (DDFa) is selected as an indicator for the degree of frozen ground degradation. A water-energy balance equation within the Budyko framework is employed to quantify the streamflow response to the direct impact of climate change, which manifests as changes in the precipitation and potential evapotranspiration, as well as the impact of frozen ground degradation, which can be regarded as part of the indirect impact of climate change. The results show that the direct impact of climate change and the impact of frozen ground degradation can explain 55% and 33%, respectively, of the streamflow decrease for the entire SRYR from Period 1 (1965-1989) to Period 2 (1990-2003). In the permafrost-dominated region upstream of the Jimai hydrological station, the impact of frozen ground degradation can explain 71% of the streamflow decrease. From Period 2 (1990-2003) to Period 3 (2004-2015), the observed streamflow did not increase as much as the precipitation; this could be attributed to the combined effects of increasing potential evapotranspiration and more importantly, frozen ground degradation. Frozen ground degradation could influence streamflow by increasing the groundwater storage when the active layer thickness increases in permafrost-dominated regions. These findings will help develop a better understanding of the impact of frozen ground degradation on water resources in the Tibetan Plateau.

  3. Seasonal Differences in Climatic Controls of Vegetation Growth in the Beijing-Tianjin Sand Source Region of China.

    Science.gov (United States)

    Wang, H.

    2017-12-01

    Seasonal differences in climatic controls of vegetation growth in the Beijing-Tianjin Sand Source Region of China Bin He1 , Haiyan Wan11 State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China Corresponding author: Bin He, email addresses: hebin@bnu.edu.cnPhone:+861058806506, Address: Beijing Normal University, College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China. Email addresses of co-authors: wanghaiyan@mail.bnu.edu.cnABSTRACTLaunched in 2000, the Beiing-Tainjin Sand Source Controlling Project (BTSSCP) is an ecological restoration project intended to prevent desertification in China. Evidence from multiple sources has confirmed increases in vegetation growth in the BTSSCP region since the initiation of the project. Precipitation and related soil moisture conditions typically are considered to be the main drivers of vegetation growth in this arid region. However, by investigating the relationships between vegetation growth and corresponding climatic factors, we identified seasonal variation in the climatic constraints of vegetation growth. In spring, vegetation growth is stimulated mainly by elevated temperature, whereas precipitation is the lead driver of summer greening. In autumn, positive effects of both temperature and precipitation on vegetation growth were observed. Furthermore, strong biosphere-atmosphere interactions were observed in this region. Spring warming promotes vegetation growth, but also reduces soil moisture. Summer greening has a strong cooling effect on land surface temperature. These results indicate that 1) precipitation-based projections of vegetation growth may be misleading; and 2) the ecological and environment consequences of ecological projects should be comprehensively evaluated. KEYWORDS: vegetation growth, climatic drivers, seasonal variation, BTSSCP

  4. Analysis on the Change of Grassland Coverage in the Source Region of Three Rivers during 2000-2012

    International Nuclear Information System (INIS)

    Luo, Chengfeng; Wang, Jiao; Liu, Meilin; Liu, Zhengjun

    2014-01-01

    The Source Region of Three Rivers (SRTR) has very important ecological functions which form an ecological security barrier for China's Qinghai-Tibet plateau. As the biggest nationally occuring nature reserve region in China, the ecological environment here is very fragile. In SRTR the grassland coverage is an effective detector to reflect the ecological environment condition, because it records the changing process of climatic and environmental sensitively. In recent years SRTR has been suffering pressures from both nature and social pressures. With MODIS data the study monitored the grassland coverage continuously in SRTR from 2000 to 2012. The density-model was adapted to estimate grassland coverage degree firstly. Then the degree of change and the change intensity, change type were used to judge the grassland coverage change trend comprehensively. For grassland coverage there was natural change annual or within the year, and the degree of change was used to judge if there was change or not. The grassland has another important characteristic, annual fluctuation, and it can be differed from sustained changes with change type. For grassland coverage, such continuous change, like improvement or degradation, and to what extent, has more guidance sense on specific production practice. On the base of change type and degree of change, change intensity was used to identify the change trend of the grassland coverage. The analysis results from our study show that steady state and fluctuation are two main change trends for the vegetation coverage in SRTR from 2000 to 2012. The conclusion of this paper can provide references in response to environment change research and in the regional ecological environmental protection project in SRTR

  5. Increasing trends in rainfall-runoff erosivity in the Source Region of the Three Rivers, 1961-2012.

    Science.gov (United States)

    Wang, Yousheng; Cheng, Congcong; Xie, Yun; Liu, Baoyuan; Yin, Shuiqing; Liu, Yingna; Hao, Yanfang

    2017-08-15

    As the head source of the two longest rivers in China and the longest river in Southeast Asia, the East Qinghai-Tibetan Plateau (QTP) is experiencing increasing thaw snowmelt and more heavy precipitation events under global warming, which might lead to soil erosion risk. To understand the potential driving force of soil erosion and its relationship with precipitation in the context of climate change, this study analyzed long-term variations in annual rainfall-runoff erosivity, a climatic index of soil erosion, by using the Mann-Kendall statistical test and Theil and Sen's approach in the Source Region of the Three Rivers during 1961-2012. The results showed the followings: (i) increasing annual rainfall-runoff erosivity was observed over the past 52years, with a mean relative trend index (RT 1 ) value of 12.1%. The increasing trend was more obvious for the latest two decades: RT 1 was nearly three times larger than that over the entire period; (ii) more precipitation events and a higher precipitation amount were the major forces for the increasing rainfall-runoff erosivity; (iii) similar rising trends in sediment yields, which corresponded to rainfall-runoff erosivity under slightly increasing vegetation coverage in the study area, implied a large contribution of rainfall-runoff erosivity to the increasing sediment yields; and (iv) high warming rates increased the risk of soil destruction, soil erosion and sediment yields. Conservation measures, such as enclosing grassland, returning grazing land to grassland and rotation grazing since the 1980s, have maintained vegetation coverage and should be continued and strengthened. Copyright © 2017 Elsevier B.V. All rights reserved.

  6. Alpine grassland soil organic carbon stock and its uncertainty in the three rivers source region of the Tibetan Plateau.

    Directory of Open Access Journals (Sweden)

    Xiaofeng Chang

    Full Text Available Alpine grassland of the Tibetan Plateau is an important component of global soil organic carbon (SOC stocks, but insufficient field observations and large spatial heterogeneity leads to great uncertainty in their estimation. In the Three Rivers Source Region (TRSR, alpine grasslands account for more than 75% of the total area. However, the regional carbon (C stock estimate and their uncertainty have seldom been tested. Here we quantified the regional SOC stock and its uncertainty using 298 soil profiles surveyed from 35 sites across the TRSR during 2006-2008. We showed that the upper soil (0-30 cm depth in alpine grasslands of the TRSR stores 2.03 Pg C, with a 95% confidence interval ranging from 1.25 to 2.81 Pg C. Alpine meadow soils comprised 73% (i.e. 1.48 Pg C of the regional SOC estimate, but had the greatest uncertainty at 51%. The statistical power to detect a deviation of 10% uncertainty in grassland C stock was less than 0.50. The required sample size to detect this deviation at a power of 90% was about 6-7 times more than the number of sample sites surveyed. Comparison of our observed SOC density with the corresponding values from the dataset of Yang et al. indicates that these two datasets are comparable. The combined dataset did not reduce the uncertainty in the estimate of the regional grassland soil C stock. This result could be mainly explained by the underrepresentation of sampling sites in large areas with poor accessibility. Further research to improve the regional SOC stock estimate should optimize sampling strategy by considering the number of samples and their spatial distribution.

  7. Dissolution and Release of Gaseous Nitrogen (N2, N2O) in the Source Region of the Yellow River

    Science.gov (United States)

    Zhang, L.; Xia, X.; Wang, J.

    2017-12-01

    Nitrogen is an important biogenic element. The migration and transformation of nitrogen in rivers is an important process affecting global nitrogen cycling and greenhouse gas emissions. However, there is a lack of research on nitrogen removal and greenhouse gas emission characteristics of high altitude rivers. In this work, the spatial and temporal variations of dissolved nitrogen (N2 and N2O) concentrations, saturation, and release flux as well as their responses to environmental factors were studied in the Yellow River source area, a typical high altitude river. The results showed that the dissolved concentrations of N2 and N2O in the rivers were 8.24-137.75 μmol.L-1 and 2.57-31.94 nmol.L-1, respectively. N2 and N2O saturation were greater than 100% for all the sampling sites, indicating that the river is a release source for atmosphere N2 and N2O. Correspondingly, the fluxes of N2 and N2O from river water to atmosphere were 24.12-1606.57 mmol (m2.d) -1 and 12.96-276.81 μmol (m2.d) -1, respectively. Generally, the dissolution concentration and release flux of N2 and N2O in July were larger than that in May. The concentrations of N2 and N2O in river water were related to the environmental factors, and the dissolved concentration of N2 in the surface water was significantly positively correlated with water temperature, NH4+-N and total inorganic nitrogen (DIN) (p<0.01). The dissolved concentration of N2O was significantly positively correlated with the content of suspended particulates, DO, and DIN (p<0.01). Thus, DIN is a key factor in the process of N2 and N2O formation. This study can help to understand the nitrogen cycling in high-altitude rivers and provide basic data for a comprehensive assessment of global river nitrogen loss. Key Words: Source Region of the Yellow River; Gaseous Nitrogen; Nitrogen loss; High altitude river

  8. Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over northwestern China

    Science.gov (United States)

    Wang, Xin; Wen, Hui; Shi, Jinsen; Bi, Jianrong; Huang, Zhongwei; Zhang, Beidou; Zhou, Tian; Fu, Kaiqi; Chen, Quanliang; Xin, Jinyuan

    2018-02-01

    Mineral dust aerosols (MDs) not only influence the climate by scattering and absorbing solar radiation but also modify cloud properties and change the ecosystem. From 3 April to 16 May 2014, a ground-based mobile laboratory was deployed to measure the optical and microphysical properties of MDs near dust source regions in Wuwei, Zhangye, and Dunhuang (in chronological order) along the Hexi Corridor over northwestern China. Throughout this dust campaign, the hourly averaged (±standard deviation) aerosol scattering coefficients (σsp, 550 nm) of the particulates with aerodynamic diameters less than 2.5 µm (PM2.5) at these three sites were sequentially 101.5 ± 36.8, 182.2 ± 433.1, and 54.0 ± 32.0 Mm-1. Correspondingly, the absorption coefficients (σap, 637 nm) were 9.7 ± 6.1, 6.0 ± 4.6, and 2.3 ± 0.9 Mm-1; single-scattering albedos (ω, 637 nm) were 0.902 ± 0.025, 0.931 ± 0.037, and 0.949 ± 0.020; and scattering Ångström exponents (Åsp, 450-700 nm) of PM2.5 were 1.28 ± 0.27, 0.77 ± 0.51, and 0.52 ± 0.31. During a severe dust storm in Zhangye (i.e., from 23 to 25 April), the highest values of σsp2.5 ( ˜ 5074 Mm-1), backscattering coefficient (σbsp2.5, ˜ 522 Mm-1), and ω637 ( ˜ 0.993) and the lowest values of backscattering fraction (b2.5, ˜ 0.101) at 550 nm and Åsp2.5 ( ˜ -0.046) at 450-700 nm, with peak values of aerosol number size distribution (appearing at the particle diameter range of 1-3 µm), exhibited that the atmospheric aerosols were dominated by coarse-mode dust aerosols. It is hypothesized that the relatively higher values of mass scattering efficiency during floating dust episodes in Wuwei and Zhangye are attributed to the anthropogenic soil dust produced by agricultural cultivations.

  9. The value of load shifting. An estimate for Norway using the EMPS model

    International Nuclear Information System (INIS)

    Doorman, Gerard; Wolfgang, Ove

    2006-05-01

    An attempt is made to estimate the value of Load Shifting (LS) in the Norwegian system, using the EMPS model. A thorough update of the demand side model and cost estimates used in the model was done as a preparation for the project, and the report gives a comprehensive description of the demand models used. The LS measure that is analyzed is moving 600 MW demand in Norway from peak to lower demand hours during the day. The value of this was estimated both in a simplified manner (based on simulated price differences between these periods), and by simulations with the EMPS model and a subsequent calculation of the socio-economic surplus. Neither approaches showed any significant value. The results do not necessarily mean that the value in reality is zero - there are a number of limitations in the model which make it difficult to estimate the real value, like the representation of wind generation, demand variability, outages, exchange prices with continental Europe, flexibility of hydro and thermal generation, reserves and elasticity of demand in the short run. It was verified through sensitivity calculations that especially increasing reserve requirements and increasing the variability of wind generation increased price differences and therefore the value of LS. A number of improvements in the EMPS model and data are proposed to obtain a more suitable simulation model for this kind of analyses: 1) modeling of reserves, 2) representation of wind variability, 3) thermal generation models, 4) differentiation between long and short term price elasticity, 5) review of interconnection capacities, 6) use of quadratic losses and the 7) representation of more stochastic factors like e.g. outages in the simulations. Although the model at present clearly has its limitations with respect to estimating the value of LS, it appears that price differences between spot prices in the actual hours in reality are small. Comparison with Nord Pool spot prices for the years 2003

  10. Hemiparesia esquerda consecutiva a empeçonhamento: Por Bothrops Jararacussu

    Directory of Open Access Journals (Sweden)

    Napoleão L. Teixeira

    1944-09-01

    Full Text Available O A. apresenta uma observação de hemiparesia esquerda, consecutiva a envenenamento por Bothrops Jararacussu. É o segundo caso que publica, com idêntica etiologia; além das suas, há duas outras observações semelhantes, de Octávio de Magalhães. Depois de discorrer sobre as hemiplegias cerebrais infantis - mais comuns - lembra que estas nem sempre se acompanham de espasticidade, podendo apresentar-se, raramente, com hipotonia muscular, ou mesmo de coréia, atetose, ou movimentos córeo-atetóticos que falam em favor de comprometimento extrapiramidal. Assinala, também, que crises epileptiformes - generalizadas ou parciais - podem ocorrer, o mesmo se podendo dizer de distúrbios psíquicos. Traduzir-se-iam, estes, por déficit intelectual marcado, podendo ir desde a debilidade mental até a idiotia; ou então, mesmo quando não há aparente comprometimento da esfera intelectual, por perturbações da afetividade, da vontade e do pragmatismo. Passando em revista as causas mais frequentes das hemiplegias cerebrais infantis, abre lugar, dentre elas, para os empeçonhamentos ofídico e escorpiônico (Magalhães e Guimarães. Estuda, a seguir, a patogenia das hemiplegias no decurso dos referidos empeçonhamentos, alinhando as hipóteses correntes, da preferência de conceituadas autoridades no assunto. Transcreve, finalmente, sua observação clínica, da qual se pode concluir, sem dúvida possível, haver, no caso "que apresenta, estreita e imediata ligação entre o envenenamento ofídico e a hemiparesia em estudo. O observado seria portador, além do mais, de crises epileptiformes generalizadas, aparecidas logo a seguir ao empeçonhamento. Além da fotografia do caso que apresenta, mostra-nos o A. outra, de caso anteriormente publicado, este, porém, de hemiplegia cerebral infantil típica, instalada aos 11 anos, após picada de Bothrops jararaca.

  11. La depresión en la infancia desde la perspectiva de las taxonomías empíricas

    OpenAIRE

    López Soler, Concepción; López Pina, José Antonio

    1998-01-01

    En este trabajo se analiza la depresión infantil desde el modelo de taxonomías empíricas propuesto por Achenbach y Edelbrock. Se revisan algunos aspectos diferenciales en el diagnóstico de la depresión en menores y adultos. La parte empírica se cent

  12. Análisis semiótico en secuencias de interacción empáticas y no empáticas: un estudio microgenético

    Directory of Open Access Journals (Sweden)

    Pablo Fossa

    Full Text Available Resumen Este estudio tuvo por objetivo explorar y describir el proceso de regulación dialógica en interacciones conversacionales. Se registraron en video treinta díadas de estudiantes desconocidos entre sí en interacciones que tuvieron una manipulación orientada a generar una situación empática o bien no-empática. Se seleccionaron cuatro segmentos de conversación, dos por cada tipo de interacción. El texto fue analizado con un protocolo de análisis semiótico basado en el modelo de análisis propuesto por (Molina, 2007. Los resultados muestran que las interacciones empáticas se caracterizan por un proceso de coconstrucción de significados, con una adecuada administración de la tensión y una identificación con el signo lingüístico. Por otra parte, las interacciones no empáticas se caracterizan por la emergencia de signos lingüísticos que no continúan la secuencia de construcción de significados; con una alta tensión dialógica, y una estrategia de distanciamiento o abandono del campo de significado.

  13. Organização de Reparo na Conversa Cotidiana: um Estudo Empírico

    Directory of Open Access Journals (Sweden)

    Caroline Caputo Pires

    2017-02-01

    Full Text Available O presente trabalho visa analisar ocorrências de trajetórias de reparo com dados em fala-em-interação em uma filmagem com quatro brasileiros intercambistas na Alemanha, no qual apresentam suas experiências no período de um ano em contato com outra língua e cultural. Assim, para descrever o fenômeno de reparo (SIDNELL, 2010, GARCEZ, 2008, LODER, 2005 é importante destacar que os participantes em interação e demonstrável pela articulação de análises comunicacionais, o fenômeno do reparo é importante para a interpretação em relação à correção na fala-em-interação, na medida em que o reparo se refere às práticas que participantes usam para contornar problemas ou obstáculos na fala, audição ou compreensão da fala. Enfatiza-se, nesse trabalho, que os estudos sobre reparo na fala-em-interação se deram no campo dos estudos da Análise da Conversa, entre estudiosos que se interessam nas ações cotidianas na vida das pessoas. Dessa forma, a base empírica desse trabalho focalizará os conceitos da Análise da Conversa, fenômenos de reparo em uma filmagem de uma interação de brasileiros em intercambio no ano de 2014. Os dados empíricos fazem parte do projeto da UFMG que investiga perspectivas comunicativas e as atitudes extracomunicativas que indivíduos realizam e desenvolvem no decorrer de um encontro intercultural de duração maior.

  14. Antigenic variation and the genetics and epigenetics of the PfEMP1 erythrocyte surface antigens in Plasmodium falciparum malaria

    DEFF Research Database (Denmark)

    Arnot, David E; Jensen, Anja T R

    2011-01-01

    . Sterile immunity is not achieved and chronic parasitization of apparently healthy adults is the norm. In this article, we analyse the best understood malaria "antigenic variation" system, that based on Plasmodium falciparum's PfEMP1-type cytoadhesion antigens, and critically review recent literature...

  15. SEISMIC SITE RESPONSE ESTIMATION IN THE NEAR SOURCE REGION OF THE 2009 L’AQUILA, ITALY, EARTHQUAKE

    Science.gov (United States)

    Bertrand, E.; Azzara, R.; Bergamashi, F.; Bordoni, P.; Cara, F.; Cogliano, R.; Cultrera, G.; di Giulio, G.; Duval, A.; Fodarella, A.; Milana, G.; Pucillo, S.; Régnier, J.; Riccio, G.; Salichon, J.

    2009-12-01

    The 6th of April 2009, at 3:32 local time, a Mw 6.3 earthquake hit the Abruzzo region (central Italy) causing more than 300 casualties. The epicenter of the earthquake was 95km NE of Rome and 10km from the center of the city of L’Aquila, the administrative capital of the Abruzzo region. This city has a population of about 70,000 and was severely damaged by the earthquake, the total cost of the buildings damage being estimated around 3 Bn €. Historical masonry buildings particularly suffered from the seismic shaking, but some reinforced concrete structures from more modern construction were also heavily damaged. To better estimate the seismic solicitation of these structures during the earthquake, we deployed temporary arrays in the near source region. Downtown L’Aquila, as well as a rural quarter composed of ancient dwelling-centers located western L’Aquila (Roio area), have been instrumented. The array set up downtown consisted of nearly 25 stations including velocimetric and accelerometric sensors. In the Roio area, 6 stations operated for almost one month. The data has been processed in order to study the spectral ratios of the horizontal component of ground motion at the soil site and at a reference site, as well as the spectral ratio of the horizontal and the vertical movement at a single recording site. Downtown L’Aquila is set on a Quaternary fluvial terrace (breccias with limestone boulders and clasts in a marly matrix), which forms the left bank of the Aterno River and slopes down in the southwest direction towards the Aterno River. The alluvial are lying on lacustrine sediments reaching their maximum thickness (about 250m) in the center of L’Aquila. After De Luca et al. (2005), these quaternary deposits seem to lead in an important amplification factor in the low frequency range (0.5-0.6 Hz). However, the level of amplification varies strongly from one point to the other in the center of the city. This new experimentation allows new and more

  16. Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over northwestern China

    Directory of Open Access Journals (Sweden)

    X. Wang

    2018-02-01

    Full Text Available Mineral dust aerosols (MDs not only influence the climate by scattering and absorbing solar radiation but also modify cloud properties and change the ecosystem. From 3 April to 16 May 2014, a ground-based mobile laboratory was deployed to measure the optical and microphysical properties of MDs near dust source regions in Wuwei, Zhangye, and Dunhuang (in chronological order along the Hexi Corridor over northwestern China. Throughout this dust campaign, the hourly averaged (±standard deviation aerosol scattering coefficients (σsp, 550 nm of the particulates with aerodynamic diameters less than 2.5 µm (PM2.5 at these three sites were sequentially 101.5 ± 36.8, 182.2 ± 433.1, and 54.0 ± 32.0 Mm−1. Correspondingly, the absorption coefficients (σap, 637 nm were 9.7 ± 6.1, 6.0 ± 4.6, and 2.3 ± 0.9 Mm−1; single-scattering albedos (ω, 637 nm were 0.902 ± 0.025, 0.931 ± 0.037, and 0.949 ± 0.020; and scattering Ångström exponents (Åsp, 450–700 nm of PM2.5 were 1.28 ± 0.27, 0.77 ± 0.51, and 0.52 ± 0.31. During a severe dust storm in Zhangye (i.e., from 23 to 25 April, the highest values of σsp2.5 ( ∼  5074 Mm−1, backscattering coefficient (σbsp2.5,  ∼  522 Mm−1, and ω637 ( ∼  0.993 and the lowest values of backscattering fraction (b2.5,  ∼  0.101 at 550 nm and Åsp2.5 ( ∼  −0.046 at 450–700 nm, with peak values of aerosol number size distribution (appearing at the particle diameter range of 1–3 µm, exhibited that the atmospheric aerosols were dominated by coarse-mode dust aerosols. It is hypothesized that the relatively higher values of mass scattering efficiency during floating dust episodes in Wuwei and Zhangye are attributed to the anthropogenic soil dust produced by agricultural cultivations.

  17. Evasion of Immunity to Plasmodium falciparum: Rosettes of Blood Group A Impair Recognition of PfEMP1

    Science.gov (United States)

    Moll, Kirsten; Palmkvist, Mia; Ch'ng, Junhong; Kiwuwa, Mpungu Steven; Wahlgren, Mats

    2015-01-01

    The ABO blood group antigens are expressed on erythrocytes but also on endothelial cells, platelets and serum proteins. Notably, the ABO blood group of a malaria patient determines the development of the disease given that blood group O reduces the probability to succumb in severe malaria, compared to individuals of groups A, B or AB. P. falciparum rosetting and sequestration are mediated by PfEMP1, RIFIN and STEVOR, expressed at the surface of the parasitized red blood cell (pRBC). Antibodies to these antigens consequently modify the course of a malaria infection by preventing sequestration and promoting phagocytosis of pRBC. Here we have studied rosetting P. falciparum and present evidence of an immune evasion mechanism not previously recognized. We find the accessibility of antibodies to PfEMP1 at the surface of the pRBC to be reduced when P. falciparum forms rosettes in blood group A RBC, as compared to group O RBC. The pRBC surrounds itself with tightly bound normal RBC that makes PfEMP1 inaccessible to antibodies and clearance by the immune system. Accordingly, pRBC of in vitro cloned P. falciparum devoid of ABO blood group dependent rosetting were equally well detected by anti-PfEMP1 antibodies, independent of the blood group utilized for their propagation. The pathogenic mechanisms underlying the severe forms of malaria may in patients of blood group A depend on the ability of the parasite to mask PfEMP1 from antibody recognition, in so doing evading immune clearance. PMID:26714011

  18. Parametrics for Molecular Deuterium Concentrations in the Source Region of the UW-IEC Device Using an Ion Acoustic Wave Diagnostic

    Science.gov (United States)

    Boris, D. R.; Emmert, G. A.

    2007-11-01

    The ion source region of the UW-Inertial Electrostatic Confinement device is comprised of a filament assisted DC discharge plasma that exists between the wall of the IEC vacuum chamber and the grounded spherical steel grid that makes up the anode of the IEC device. A 0-dimensional rate equation calculation of the molecular deuterium ion species concentration has been applied utilizing varying primary electron energy, and neutral gas pressure. By propagating ion acoustic waves in the source region of the IEC device the concentrations of molecular deuterium ion species have been determined for these varying plasma conditions, and high D3^+ concentrations have been verified. This was done by utilizing the multi-species ion acoustic wave dispersion relation, which relates the phase speed of the multi-species ion acoustic wave, vph, to the sum in quadrature of the concentration weighted ion acoustic sound speeds of the individual ion species.

  19. Determining the source region of auroral emissions in the prenoon oval using coordinated Polar BEAR UV-imaging and DMSP particle measurements

    International Nuclear Information System (INIS)

    Newell, P.T.; Meng, C.I.; Huffman, R.E.

    1992-01-01

    The Polar Beacon Experiment and Auroral Research (Polar BEAR) satellite included the capability for imaging the dayside auroral oval in full sunlight at several wavelengths. The authors compare particle observations from the DMSP F7 satellite during dayside auroral oval crossings with approximately simultaneous Polar BEAR 1,356-angstrom images to determine the magnetospheric source region of the dayside auroral oval. The source region is determined from the Defense Meteorological Satellite Program (DMSP) particle data, according to recent work concerning the classification and identification of precipitation source regions. The close DMSP/Polar BEAR coincidences all occur when the former satellite is located between 0945 and 1,000 MLT. The authors found instances of auroral arcs mapping to each of several different regions, including the boundary plasma sheet, the low-latitude boundary layer, and the plasma mantle. However, the results indicate that about half the time the most prominent auroral arcs are located at the interfaces between distinct plasma regions, at least at the local time studied here

  20. The evaluation of the earthquake hazard using the exponential distribution method for different seismic source regions in and around Ağrı

    Energy Technology Data Exchange (ETDEWEB)

    Bayrak, Yusuf, E-mail: ybayrak@agri.edu.tr [Ağrı İbrahim Çeçen University, Ağrı/Turkey (Turkey); Türker, Tuğba, E-mail: tturker@ktu.edu.tr [Karadeniz Technical University, Department of Geophysics, Trabzon/Turkey (Turkey)

    2016-04-18

    The aim of this study; were determined of the earthquake hazard using the exponential distribution method for different seismic sources of the Ağrı and vicinity. A homogeneous earthquake catalog has been examined for 1900-2015 (the instrumental period) with 456 earthquake data for Ağrı and vicinity. Catalog; Bogazici University Kandilli Observatory and Earthquake Research Institute (Burke), National Earthquake Monitoring Center (NEMC), TUBITAK, TURKNET the International Seismological Center (ISC), Seismological Research Institute (IRIS) has been created using different catalogs like. Ağrı and vicinity are divided into 7 different seismic source regions with epicenter distribution of formed earthquakes in the instrumental period, focal mechanism solutions, and existing tectonic structures. In the study, the average magnitude value are calculated according to the specified magnitude ranges for 7 different seismic source region. According to the estimated calculations for 7 different seismic source regions, the biggest difference corresponding with the classes of determined magnitudes between observed and expected cumulative probabilities are determined. The recurrence period and earthquake occurrence number per year are estimated of occurring earthquakes in the Ağrı and vicinity. As a result, 7 different seismic source regions are determined occurrence probabilities of an earthquake 3.2 magnitude, Region 1 was greater than 6.7 magnitude, Region 2 was greater than than 4.7 magnitude, Region 3 was greater than 5.2 magnitude, Region 4 was greater than 6.2 magnitude, Region 5 was greater than 5.7 magnitude, Region 6 was greater than 7.2 magnitude, Region 7 was greater than 6.2 magnitude. The highest observed magnitude 7 different seismic source regions of Ağrı and vicinity are estimated 7 magnitude in Region 6. Region 6 are determined according to determining magnitudes, occurrence years of earthquakes in the future years, respectively, 7.2 magnitude was in 158

  1. Contra um Fetichismo nos Estudos Empíricos em Direito Internacional: Moldura Intencional e o Esvaziamento Significativo da Empiria

    Directory of Open Access Journals (Sweden)

    Artur Roberto Capella Giannattasio

    2018-04-01

    Full Text Available Os estudos em Direito Internacional no Brasil têm se aproximado de uma tendência neo-realista do Direito, a qual visa a usar técnicas empíricas na construção e na apresentação de seu objeto para verificar as condições materiais de criação e aplicação do Direito Internacional. Apesar da relevância dessa abordagem para aprimorar o conhecimento jurídico-científico internacional, este trabalho suscita um alerta fenomenológico de matriz husserliana. A discussão recente em torno da criação de uma Corte Constitucional Internacional (CCI se mostra um exemplo ilustrativo. A partir de análise qualitativa documental de fontes primárias e secundárias relativas à CCI, este estudo ressalta que um mesmo material empírico pode sustentar argumentos divergentes - no caso, reforço ou mitigação da autodeterminação dos povos. Essa divergência é interpretada epistemologicamente de acordo com o pensamento fenomenológico husserliano. Percebe-se que, independentemente do material empírico coletado, as conclusões se estabelecem de acordo com o posicionamento categorial do pesquisador. Argumenta-se assim que, apesar de haver uma aderência ao significante empírico, o processo de significação pouco depende dele, o qual tem seu sentido esvaziado. Por isso, argumenta-se que a busca de explicações sobre a origem e a efetividade do Direito Internacional não se restringe a uma dimensão estritamente empírica: apesar de ser necessário incorporar e aprimorar técnicas empíricas nos estudos em Direito Internacional, os limites de aplicação e de eficácia de suas normas jurídicas também derivam de condições imateriais vinculadas às restrições significativas relativas à posição categorial daqueles que as estudam e as operacionalizam.

  2. FPGA-based Upgrade to RITS-6 Control System, Designed with EMP Considerations

    International Nuclear Information System (INIS)

    Anderson, Harold D.; Williams, John T.

    2009-01-01

    The existing control system for the RITS-6, a 20-MA 3-MV pulsed-power accelerator located at Sandia National Laboratories, was built as a system of analog switches because the operators needed to be close enough to the machine to hear pulsed-power breakdowns, yet the electromagnetic pulse (EMP) emitted would disable any processor-based solutions. The resulting system requires operators to activate and deactivate a series of 110-V relays manually in a complex order. The machine is sensitive to both the order of operation and the time taken between steps. A mistake in either case would cause a misfire and possible machine damage. Based on these constraints, a field-programmable gate array (FPGA) was chosen as the core of a proposed upgrade to the control system. An FPGA is a series of logic elements connected during programming. Based on their connections, the elements can mimic primitive logic elements, a process called synthesis. The circuit is static; all paths exist simultaneously and do not depend on a processor. This should make it less sensitive to EMP. By shielding it and using good electromagnetic interference-reduction practices, it should continue to operate well in the electrically noisy environment. The FPGA has two advantages over the existing system. In manual operation mode, the synthesized logic gates keep the operators in sequence. In addition, a clock signal and synthesized countdown circuit provides an automated sequence, with adjustable delays, for quickly executing the time-critical portions of charging and firing. The FPGA is modeled as a set of states, each state being a unique set of values for the output signals. The state is determined by the input signals, and in the automated segment by the value of the synthesized countdown timer, with the default mode placing the system in a safe configuration. Unlike a processor-based system, any system stimulus that results in an abort situation immediately executes a shutdown, with only a tens

  3. Matrimonios mixtos intraeuropeos: un modelo empírico (Intra-European intermarriage: an empirical model

    Directory of Open Access Journals (Sweden)

    Alaminos Chica, Antonio Francisco

    2008-06-01

    Full Text Available Resumen: La heterogeneidad con la que nos encontramos al estudiar las parejas interculturales o mixtas, va más allá de las diferencias de origen sociocultural; interviene factores tales como el rol que cada individuo adopta dentro de la pareja (por ejemplo, quién contribuye más económicamente, el status, el nivel educativo, etc.. En este artículo se propone un modelo empírico que muestra el efecto de un conjunto de variables, que expresan circunstancias sociales, sobre la decisión de formar un matrimonio interculturalmente mixto. También las consecuencias en la vida social del individuo.Abstract: The intercultural marriages or mixed marriages depend upon several factor. Not only the different cultural origin. Other determinants like the role of the partner (i.e. economic contribution, status, educational level, etc. or the type of the family (modern, traditional, etc. influence the outcomes. This paper contains a proposal of empirical model for study the intra-European mixed marriages.

  4. Um estudo empírico de um sistema de reconhecimento facial utilizando o classificador KNN

    Directory of Open Access Journals (Sweden)

    Fabio Abrantes Diniz

    2016-06-01

    Full Text Available Neste artigo, apresenta-se um estudo empírico de otimização das taxas de acurácias resultantes de um sistema de reconhecimento facial baseado nas técnicas Eigenfaces e K-Nearest Neighbors. Foram investigadas as seguintes variáveis: imagens com três dimensões distintas, número de características (Eigenfaces, valores de k da técnica K-Nearest Neighbors e três medidas de distância (euclidiana, Manhattan e euclidiana normalizada. Os estudos foram importantes para entender empiricamente quais parâmetros são os mais relevantes para as técnicas analisadas e que resultam em melhores taxas de acurácias de reconhecimento facial. Os resultados dos experimentos comprovaram que as imagens com dimensões 12x9 pixels produzem as melhores taxas de acurácias de reconhecimento facial, combinando com a medida de distância euclidiana normalizada e um número de Eigenfaces igual a vinte.

  5. Test Series 4: seismic-fragility tests of naturally-aged Exide EMP-13 battery cells

    International Nuclear Information System (INIS)

    Bonzon, L.L.; Hente, D.B.; Kukreti, B.M.; Schendel, J.; Tulk, J.D.; Janis, W.J.; Black, D.A.; Paulsen, G.D.; Aucoin, B.D.

    1985-03-01

    This report, the fourth in a test series of an extensive seismic research program, covers the testing of a 27-year old lead-antimony Exide EMP-13 cells from the recently decommissioned Shippingport Atomic Power Station. The Exide cells were tested in two configurations using a triaxial shake table: single-cell tests, rigidly mounted; and multicell (five-cell) tests, mounted in a typical battery rack. A total of nine electrically active cells was used in the two different cell configurations. None of the nine cells failed during the actual seismic tests when a range of ZPAs up to 1.5 g was imposed. Subsequent discharge capacity tests of five of the cells showed, however, that none of the cells could deliver the accepted standard of 80% of their rated electrical capacity for 3 hours. In fact, none of the 5 cells could deliver more than a 33% capacity. Two of the seismically tested cells and one untested, low capacity cell were disassembled for examination and metallurgical analyses. The inspection showed the cells to be in poor condition. The negative plates in the vicinity of the bus connections were extremely weak, the positive buses were corroded and brittle, negative and positive active material utilization was extremely uneven, and corrosion products littered the cells

  6. Final report for EMP instrumentation project DNA IACRO 75-815: magnetic thin film sensors

    International Nuclear Information System (INIS)

    Hsieh, E.J.; Miller, D.E.; Vindelov, K.E.; Brown, T.G.

    1975-01-01

    The magnetic thin film current sensor/recorder is a passive device which responds to the peak current and pulse shape of a transient event. The transient current information becomes a permanent record on the film. The thin film device is small, low mass and reusable. It has been proven to be fast (less than 1/2 nanosecond response), radiation hard and applicable to peak current measurement of both CW and pulsed signals. The sensors were initially developed at LLL for pulse-energy measurement on exploding wires. Later the Defense Nuclear Agency sponsored the present project to develop the magnetic thin film devices as EMP diagnostic tools. The Air Force Weapons Lab supported the work to test the field capabilities of the thin film devices at ARES test facility, Kirtland AFB. Sandia Lab is now using a new version of the thin film sensors to monitor the transient current induced by intense radiation in their hybrid microcircuits. Also, a field test has been planned with Naval Electronics Laboratory Center where the thin film sensors are to be used to measure peak CW current caused by rf radiation. Research results are summarized

  7. A compra de votos: uma aproximação empírica

    Directory of Open Access Journals (Sweden)

    Bruno Wilhelm Speck

    2003-05-01

    Full Text Available O artigo aborda o fenômeno da compra de votos no contexto histórico e apresenta dados de um levantamento empírico realizado através de uma pesquisa de opinião após as eleições municipais no Brasil no ano 2000. São discutidas questões relacionadas ao significado da compra de votos no conjunto das questões ligadas à lisura do processo eleitoral. O texto aborda também os problemas enfrentados na pesquisa em função do assunto abordado e soluções metodológicas encontradas.The author presents the results of a national survey on vote buying during the local elections in Braszil in 2000. In his analysis he places vote buying into the broader historical perspective of electoral and other forms of manipulation and corruption. Specific methodological questions of surveys on such critical questions like fraude and corruption are discussed

  8. The Application of GIS Viewshed Analysis to Roman Urban Studies: the Case-Study of Empúries, Spain

    Directory of Open Access Journals (Sweden)

    Alan E. Kaiser

    2003-05-01

    Full Text Available This article demonstrates the potential of applying GIS viewshed analysis to Roman urban studies. It examines the visual dynamics of the Roman city of Empúries, Spain, through an analysis of the visibility of, and view from, a temple and a domus within the city. The analysis proves that the two buildings in question would have had wide views of the Gulf of Roses to the east of the city, and could easily have been seen by people in boats in the Gulf, but they were virtually invisible from within the city and would certainly not have dominated the cityscape. The article concludes that the absence of the villa and temple from the intramural cityscape of Empúries cautions modern investigators of ancient cities against simply assuming that currently prominent ruins on hills or ridges were also highly visible from near as well as far in antiquity.

  9. La relación entre creatividad y expertise: contribuciones teóricas y empíricas

    Directory of Open Access Journals (Sweden)

    Afonso C. T. Galvao

    2009-06-01

    Full Text Available La creatividad y el expertise son temas que están recibiendo mayor atención de los inves­tigadores en distintos campos del conocimiento. Atributos personales asociados a la alta producción creativa, factores que favorecen el desarrollo, la expresión de la creatividad y el expertise, así como los procesos implicados en el desarrollo de la alta competencia y la creatividad, son temas que han sido objeto de numerosos estudios. El presente estudio pre­senta contribuciones teóricas y estudios empíricos acerca de la creatividad y el expertise. Se describen los elementos comunes para el desarrollo de la creatividad y el expertise, así como las características de los ambientes educativos que los promueven, los modelos teóricos y estudios empíricos.

  10. PENGOLAHAN BUAH DAN BIJI RAMBUTAN SEBAGAI MAKANAN TRADISIONAL KOKTAIL, MANISAN, EMPING BIJI RAMBUTAN DAN OBAT HERBAL YANG BERKHASIAT

    Directory of Open Access Journals (Sweden)

    Nuni Widiarti

    2013-02-01

    Full Text Available Kegiatan pengabdian kepada masyarakat berupa penyuluhan Pengolahan Buah Dan Biji Rambutan Sebagai Makanan Tradisional Koktail, Manisan, Emping Biji Rambutan Dan Obat Herbal Yang Berkhasiat bertujuan untuk memberikan pengetahuan kepada masyarakat khususnya ibu-ibu PKK dukuh kanggan Desa Wringinputih terhadap manfaat rambutan, dan biji rambutan terhadap kesehatan beserta bagaimana meningkatkan nilai jual rambutan dan biji rambutan pada saat panen raya. Khalayak sasaran dalam pengabdian masyarakat ini adalah ibu-ibu rumah tangga di dukuh Kanggan Desa Wringinputih khususnya warga RT 01 dan 02 RW XIII yang berjumlah 20 orang. Metode yang dilakukan dalam pngabdian ini adalah penyuluhan dan demonstrasi pembuatan emping serta manisan buah rambutan. Manfaat yang diperoleh dari hasil pengabdian ini adalah masyarakat menjadi tahu manfaat dari daun hingga akar dan buah rambutan terhadap berbagai penyakit dan kecantikan.

  11. PENGOLAHAN BUAH DAN BIJI RAMBUTAN SEBAGAI MAKANAN TRADISIONAL KOKTAIL, MANISAN, EMPING BIJI RAMBUTAN DAN OBAT HERBAL YANG BERKHASIAT

    OpenAIRE

    Nuni Widiarti; Sri Wahyuni; F Widhi Mahatmanti

    2013-01-01

    Kegiatan pengabdian kepada masyarakat berupa penyuluhan Pengolahan Buah Dan Biji Rambutan Sebagai Makanan Tradisional Koktail, Manisan, Emping Biji Rambutan Dan Obat Herbal Yang Berkhasiat bertujuan untuk memberikan pengetahuan kepada masyarakat khususnya ibu-ibu PKK dukuh kanggan Desa Wringinputih terhadap manfaat rambutan, dan biji rambutan terhadap kesehatan beserta bagaimana meningkatkan nilai jual rambutan dan biji rambutan pada saat panen raya. Khalayak sasaran dalam pengabdian masyarak...

  12. STATIC{sub T}EMP: a useful computer code for calculating static formation temperatures in geothermal wells

    Energy Technology Data Exchange (ETDEWEB)

    Santoyo, E. [Universidad Nacional Autonoma de Mexico, Centro de Investigacion en Energia, Temixco (Mexico); Garcia, A.; Santoyo, S. [Unidad Geotermia, Inst. de Investigaciones Electricas, Temixco (Mexico); Espinosa, G. [Universidad Autonoma Metropolitana, Co. Vicentina (Mexico); Hernandez, I. [ITESM, Centro de Sistemas de Manufactura, Monterrey (Mexico)

    2000-07-01

    The development and application of the computer code STATIC{sub T}EMP, a useful tool for calculating static formation temperatures from actual bottomhole temperature data logged in geothermal wells is described. STATIC{sub T}EMP is based on five analytical methods which are the most frequently used in the geothermal industry. Conductive and convective heat flow models (radial, spherical/radial and cylindrical/radial) were selected. The computer code is a useful tool that can be reliably used in situ to determine static formation temperatures before or during the completion stages of geothermal wells (drilling and cementing). Shut-in time and bottomhole temperature measurements logged during well completion activities are required as input data. Output results can include up to seven computations of the static formation temperature by each wellbore temperature data set analysed. STATIC{sub T}EMP was written in Fortran-77 Microsoft language for MS-DOS environment using structured programming techniques. It runs on most IBM compatible personal computers. The source code and its computational architecture as well as the input and output files are described in detail. Validation and application examples on the use of this computer code with wellbore temperature data (obtained from specialised literature) and with actual bottomhole temperature data (taken from completion operations of some geothermal wells) are also presented. (Author)

  13. A specific PfEMP1 is expressed in P. falciparum sporozoites and plays a role in hepatocyte infection

    DEFF Research Database (Denmark)

    Zanghì, Gigliola; Vembar, Shruthi S; Baumgarten, Sebastian

    2018-01-01

    Heterochromatin plays a central role in the process of immune evasion, pathogenesis, and transmission of the malaria parasite Plasmodium falciparum during blood stage infection. Here, we use ChIP sequencing to demonstrate that sporozoites from mosquito salivary glands expand heterochromatin......_SpzPfEMP1. Overall, we show that the epigenetic signature of var genes is reset in mosquito stages. Moreover, the identification of a strain-specific sporozoite PfEMP1 is highly relevant for vaccine design based on sporozoites....

  14. Modelación empírica de flotación en columna a escala piloto

    Directory of Open Access Journals (Sweden)

    Simpson, J.

    2010-04-01

    Full Text Available The Procemin-I area of the Centro Minero Metalúrgico Tecnología y Servicio (CIMM T & S, has a full milling and flotation pilot plant in which several experiences are developed as: optimization of circuits, plant design, procurement of operating parameters, etc. Ones of the equipment in operation is the column flotation to pilot scale, witch have a medium level of automation. The problem presented in the operation of the column flotation is the low relationship during the operation between the operating basis parameters and the metallurgical results. The mathematical models used today to estimate the metallurgical results (i.e.: concentrate, tailing, enrichment and recovery depending on variables that are manipulated by hand according the operator experience. But the process engineer needs tools without subjective vision to obtain the best performance of the column. The method used to help the column operation was a mathematical model based on the Stepwise Regression then considering empirical relationships between operational variables and experimental results. All the mathematicals relationship developed in this study have a good correlation (up 90 % of precision, except one (up 70 % due by non regular mineralogical feed.

    El área Procemin I, del Centro Minero Metalúrgico Tecnología y Servicio (CIMM T&S, ubicado en Santiago de Chile, cuenta con una completa planta piloto de molienda y flotación en la cual se desarrollan experiencias de optimización de circuitos, diseño de plantas, obtención de parámetros de operación, entre otras cosas. Uno de los equipos que posee la planta piloto es una columna de flotación piloto, con un alto nivel de automatización. Una de las problemáticas presentadas para la operación de la columna de flotación es no lograr tomar decisiones de operación sobre la base de los resultados metalúrgicos que se puedan obtener. El desarrollo de modelos matemáticos que permitan estimar los resultados metal

  15. Monitoring of seismic events from a specific source region using a single regional array: A case study

    Science.gov (United States)

    Gibbons, S. J.; Kværna, T.; Ringdal, F.

    2005-07-01

    In the monitoring of earthquakes and nuclear explosions using a sparse worldwide network of seismic stations, it is frequently necessary to make reliable location estimates using a single seismic array. It is also desirable to screen out routine industrial explosions automatically in order that analyst resources are not wasted upon detections which can, with a high level of confidence, be associated with such a source. The Kovdor mine on the Kola Peninsula of NW Russia is the site of frequent industrial blasts which are well recorded by the ARCES regional seismic array at a distance of approximately 300 km. We describe here an automatic procedure for identifying signals which are likely to result from blasts at the Kovdor mine and, wherever possible, for obtaining single array locations for such events. Carefully calibrated processing parameters were chosen using measurements from confirmed events at the mine over a one-year period for which the operators supplied Ground Truth information. Phase arrival times are estimated using an autoregressive method and slowness and azimuth are estimated using broadband f{-} k analysis in fixed frequency bands and time-windows fixed relative to the initial P-onset time. We demonstrate the improvement to slowness estimates resulting from the use of fixed frequency bands. Events can be located using a single array if, in addition to the P-phase, at least one secondary phase is found with both an acceptable slowness estimate and valid onset-time estimate. We evaluate the on-line system over a twelve month period; every event known to have occured at the mine is detected by the process and 32 out of 53 confirmed events were located automatically. The remaining events were classified as “very likely” Kovdor events and were subsequently located by an analyst. The false alarm rate is low; only 84 very likely Kovdor events were identified during the whole of 2003 and none of these were subsequently located at a large distance from

  16. Efectividad del aprendizaje cooperativo en contabilidad: una contrastación empírica

    Directory of Open Access Journals (Sweden)

    María del Mar Delgado Hurtado

    2015-07-01

    Full Text Available La presente investigación tiene como objetivo verificar uno de los principales beneficios atribuidos a la metodología docente «aprendizaje cooperativo»: la obtención de mejores resultados de aprendizaje. Para ello hemos realizado un cuasiexperimento con la finalidad de comparar las calificaciones de un grupo de alumnos, en cuyo proceso de aprendizaje se ha empleado el aprendizaje cooperativo junto con la clase magistral, con las calificaciones de otro grupo, donde solo ha sido utilizada la clase magistral. Los resultados obtenidos tras la aplicación de un análisis de covarianza (ANCOVA, controlando el género, edad, las calificaciones previas del alumno, asistencia a clase, dedicación y motivación, revelan mejores resultados en el grupo de aprendizaje cooperativo que en el grupo de clase magistral. Adicionalmente comprobamos la efectividad de la metodología del aprendizaje cooperativo en diferentes niveles de aprendizaje, de acuerdo con la taxonomía de Bloom (1956. Los resultados reflejan diferencias significativas en el nivel de aplicación-análisis pero no en el nivel conocimiento-comprensión. Este trabajo contribuye a la literatura empírica sobre aprendizaje cooperativo, proporcionando evidencia adicional sobre la obtención de mejores resultados de aprendizaje en contabilidad, tras haber controlado el efecto de variables que previamente no habían sido consideradas en la contrastación de esta metodología como la dedicación del alumno y la motivación.

  17. Stable hydrogen isotopic composition of n-alkanes in atmospheric aerosols as a tracer for the source region of terrestrial plant waxes

    Science.gov (United States)

    Yamamoto, S.; Kawamura, K.

    2009-12-01

    Studies on molecular composition and compound-specific carbon isotopic ratio (δ13C) of leaf wax n-alkanes in atmospheric aerosols have revealed a long-range atmospheric transport of terrestrial higher plant materials over the south Atlantic and western Pacific oceans. However, molecular and δ13C compositions of terrestrial plant waxes in the eastern part of the Asian continent are relatively constant reflecting C3-dominated vegetation, which makes it difficult to specify the source regions of plant materials in the atmospheric aerosols over the East Asia and northwest Pacific regions. Recent observation displays a large (>100‰) spatial variation in hydrogen isotopic composition (δD) of rainwater in East Asia. Because δD values of terrestrial higher plants sensitively reflect those of precipitation waters, δD of leaf waxes are expected to provide information on their source region. In this study, we measured the δD of n-alkanes in atmospheric aerosols from Tokyo to better understand the origin of leaf wax n-alkanes in atmospheric aerosols. The δD values of fossil fuel n-alkanes (C21 to C24) in Tokyo aerosols range from -65 to -94‰, which are in a range of those reported in marine crude oils. In contrast, the δD of higher molecular weight (C29 and C31) n-alkanes (δDHMW) show much larger values by ~70‰ than those of fossil fuel n-alkanes. Their values were found to exhibit concomitant variations with carbon preference index (CPI), suggesting that the δDHMW reflect the δD of leaf wax n-alkanes with a variable contribution from fossil fuel n-alkanes. Nevertheless, good positive correlation (r = 0.89, p < 0.01) between the δDHMW and CPI values enable us to remove the contribution of fossil fuels using a mass balance approach by assuming that CPI of fossil fuel is 1 and CPI of plant waxes is 5-15. Calculated n-alkane δD values averaged from -170 to -185‰ for C29 and from -155 to -168‰ for C31. These values are consistent with those reported from

  18. Dissection of the role of PfEMP1 and ICAM-1 in the sensing of Plasmodium-falciparum-infected erythrocytes by natural killer cells.

    Directory of Open Access Journals (Sweden)

    Myriam Baratin

    Full Text Available BACKGROUND: Host innate immunity contributes to malaria clinical outcome by providing protective inflammatory cytokines such as interferon-gamma, and by shaping the adaptive immune response. Plasmodium falciparum (Pf is the etiologic agent of the most severe forms of human malaria. Natural Killer (NK cells are lymphocytes of the innate immune system that are the first effectors to produce interferon-gamma in response to Pf. However, the molecular bases of Pf-NK cell recognition events are unknown. Our study focuses on the role of Pf erythrocyte membrane protein 1 (PfEMP1, a major Pf virulence factor. PfEMP1 is expressed on parasitized-erythrocytes and participates to vascular obstruction through the binding to several host receptors. PfEMP1 is also a pivotal target for host antibody response to Pf infection. METHODOLOGY/PRINCIPAL FINDINGS: Using genetically-engineered parasite mutant strains, a human genetic deficiency, and blocking antibodies, we identified two receptor-ligand pairs involved in two uncoupled events occurring during the sensing of Pf infection by NK cells. First, PfEMP1 interaction with one of its host receptor, chondroitin sulfate A, mediates the cytoadhesion of Pf-infected erythrocytes to human NK cell lines, but is not required for primary NK cell activation. Second, intercellular adhesion molecule-1 (ICAM-1, another host receptor for PfEMP1, is mandatory for NK cell interferon-gamma response. In this case, ICAM-1 acts via its engagement with its host ligand, LFA-1, and not with PfEMP1, consistent with the obligatory cross-talk of NK cells with macrophages for their production of interferon-gamma. CONCLUSION/SIGNIFICANCE: PfEMP1-independent but ICAM-1/LFA-1-dependent events occurring during NK cell activation by Pf highlight the fundamental role of cellular cooperation during innate immune response to malaria.

  19. Spinal Cord Stimulation Provides Pain Relief with Improved Psychosocial Function: Results from EMP3OWER.

    Science.gov (United States)

    Rosenberg, Jason; Fabi, Alain; Candido, Kenneth; Knezevic, Nick; Creamer, Michael; Carayannopoulos, Alexios; Ghodsi, Abdi; Nelson, Christopher; Bennett, Matthew

    2016-12-01

    The EMP 3 OWER™ study evaluated spinal cord stimulation (SCS) safety and efficacy and the associated changes in psychosocial and functional outcomes. Upon informed consent and IRB approval, 620 eligible subjects were enrolled prior to SCS trial evaluation and were assessed at baseline, 3, 6 and 12 months post-implant. Patient-reported pain relief (PRP), numerical rating scale (NRS), satisfaction, quality of life (QOL), and pain disability index (PDI) were assessed at all follow-up visits while the pain catastrophizing scale (PCS), short form-36 (SF-36), short form-McGill pain questionnaire version 2 (SF-MPQ-2), and the state-trait anxiety inventory (STAI) were assessed at the 6- and 12-month follow-up visits. Device and/or procedure-related adverse events were also recorded and reported. Subjects reporting a PRP ≥ 50% were considered responders. Repeated measures analysis of variance (RMANOVA) examined the changes across time for all continuous measures. A total of 401 (71%) subjects received a permanent implant. Mean (±SD) patient-reported pain relief was 59.3% (±26.2), 59.2% (±28.9), and 58.2% (±32.0) at 3, 6, and 12 months, respectively. A majority of enrolled subjects were responders at 3 (75.5%), 6 (74.7%), and 12 months (69.7%). RMANOVA revealed a statistically significant change for NRS, PCS, PDI, SF-36, SF-MPQ-2, and STAI scores. At 3 months, the majority of subjects (85.7%) were either very satisfied or satisfied with their device, with similar results at 6 and 12 months. At 3 months, the majority of subjects (73.3%) reported greatly improved or improved QOL with similar results at 6 and 12 months. Spinal cord stimulation provided pain relief and significant improvement of patient psychological and functional outcome measures. © 2016 American Academy of Pain Medicine. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  20. Gobierno Corporativo y Calidad de la Información Contable: Evidencia Empírica

    Directory of Open Access Journals (Sweden)

    JUAN MONTERREY MAYORAL

    2008-06-01

    Full Text Available En el presente trabajo analizamos empíricamente los efectos de las actividades de Gobierno Corporativo sobre la calidad del resultado de las compañías cotizadas en el mercado español de capitales. Nuestros resultados han puesto de manifiesto una moderada influencia de las tareas desempeñadas por el grado de actividad del Consejo de Administración, que guarda una relación positiva y significativa con la calidad del resultado, pero no su tamaño y composición. Con relación al Comité de Auditoría, ninguna de las variables ha resultado ser estadísticamente significativa, y con respecto a la participación del equipo directivo en la propiedad de la firma, los resultados obtenidos indican cómo moderados niveles de propiedad gerencial aportan un efecto benéfico sobre la calidad contable, si bien a medida que su participación se eleva el efecto se invierte y se hace adverso. También hemos mostrado cómo la presencia de las familias fundadoras en el capital favorece la calidad contable, sin que hayamos obtenido evidencia de efecto alguno de la participación de tenedores de bloques significativos.This paper presents an empirical analysis of the impact of Corporate Governance practices on the quality of earnings reported by Spanish listed companies. Based on a sample of 136 non-financial firms over the period 2003-2005, we computed abnormal accruals based on Jones (1991 model as a proxy for earnings quality and experimental variables representing size, independence and activeness of the Board of Directors and the Audit Committee, CEO power concentration, board members’ compensation schemes and ownership structure. Our results suggest that earnings quality is slightly positively affected by the nature and intensiveness of the activities carried out by the Board, but has no relationship with its size and composition. None of the variables related to the Audit Committee showed a significant association with earnings quality. As for

  1. Parameter Estimation

    DEFF Research Database (Denmark)

    Sales-Cruz, Mauricio; Heitzig, Martina; Cameron, Ian

    2011-01-01

    of optimisation techniques coupled with dynamic solution of the underlying model. Linear and nonlinear approaches to parameter estimation are investigated. There is also the application of maximum likelihood principles in the estimation of parameters, as well as the use of orthogonal collocation to generate a set......In this chapter the importance of parameter estimation in model development is illustrated through various applications related to reaction systems. In particular, rate constants in a reaction system are obtained through parameter estimation methods. These approaches often require the application...... of algebraic equations as the basis for parameter estimation.These approaches are illustrated using estimations of kinetic constants from reaction system models....

  2. Determinantes de la equidad en el financiamiento de los medicamentos en Argentina: un estudio empírico

    OpenAIRE

    Dondo, Mariana; Monsalvo, Mauricio; Garibaldi, Lucas A.

    2016-01-01

    Resumen Los medicamentos constituyen un alto porcentaje del gasto en salud de los hogares, por eso, tener un sistema progresivo de financiamiento de medicamentos es fundamental para lograr un sistema de salud equitativo. Se ha propuesto que los determinantes de la equidad en el financiamiento son socioeconómicos, demográficos y asociados a la intervención pública, sin embargo, se ha avanzado poco en su evaluación empírica y en la cuantificación de su importancia relativa. En este trabajo esti...

  3. La PYME innovadora mexicana ante la crisis económica. Un estudio empírico

    OpenAIRE

    Edwin Estrella Pacheco; Gabriel Góngora Biachi; Marlene Martín Méndez

    2011-01-01

    Este trabajo estudia el crecimiento y el empleo de las empresas industriales manufactureras que son innovadoras del estado de Yucatán, en México, durante 2007-2009, periodo de la crisis financiera global. El incremento del desempleo es consecuencia del cierre de empresas, para recortar gastos. Se estudia el impacto de dicha crisis comparando el efecto en aquellas empresas que son innovadoras, con aquellas que no lo son. Se realiza un estudio empírico a 138 PYME, usando una entrevista dirigida...

  4. Teoria da agência e franchising: evidência empírica para o caso brasileiro

    OpenAIRE

    Rigoni, Ramon Frigi

    2015-01-01

    O presente estudo tem um duplo objetivo: (i) analisar os determinantes da escolha das firmas por um modelo de franchising na estratégia de expansão de seus negócios, e (ii) analisar como os termos de um contrato de franchising podem potencialmente ser influenciados por questões relativas a compartilhamento de risco, problemas de incentivo relacionados ao risco moral (moral hazard) e restrições de recursos financeiros. Essa discussão se dará seguindo a abordagem empírica proposta por Lafontain...

  5. Condições de trabalho do jornalista: o que revela a pesquisa empírica

    Directory of Open Access Journals (Sweden)

    Juliana Bulhões Alberto Dantas

    2017-03-01

    Full Text Available Investigamos acerca do impacto das condições de trabalho do jornalista na saúde e na qualidade de vida deste profissional. Apresentamos aqui um relato com os primeiros resultados da pesquisa, a partir de uma síntese das três etapas de desenvolvimento do trabalho: pesquisa exploratória, pesquisa bibliográfica e pesquisa de campo. Enfatizamos os resultados colhidos no pré-teste do instrumento e o levantamento de dados empíricos obtidos a partir de entrevistas em profundidade.

  6. Work family balance : mito ou aptidão : estudo empírico sobre antecedentes e consequências

    OpenAIRE

    Pedro, Ana Margarida Alexandre

    2016-01-01

    Dissertação de mestrado em Marketing, apresentada à Faculdade de Economia da Universidade de Coimbra, sob a orientação de Arnaldo Fernandes Matos Coelho e Joaquim Luís Medeiros Alcoforado. “Work Family Balance – Mito ou Aptidão? Estudo Empírico Sobre Antecedentes e Consequências” visa contribuir, com base na revisão bibliográfica, para a compreensão de quais as variáveis que contribuem para esse equilíbrio dinâmico e quais as repercussões. Este tema insere-se no Marketing Inter...

  7. El enfoque empírico-inductivo y los problemas de la investigación social en Venezuela

    Directory of Open Access Journals (Sweden)

    Sorayda Rincón

    2001-05-01

    Full Text Available El hombre históricamente ha estudiado el conocimiento humano, buscando diferenciar el conocimiento vulgar del conocimiento científico. Existen diversas formas de producir el conocimiento científico que comienzan a formalizarse antes del siglo XX y en el siglo XX. En el siglo XX uno de los enfoques más importantes para la producción de conocimiento fue el enfoque empírico inductivo (positivismo que aún hoy día tiene gran influencia en las ciencias sociales en Venezuela. Es por ello, que la presente investigación tiene como propósito disertar de manera teórica acerca del enfoque empírico inductivo, su influencia y limitaciones en la producción del conocimiento científico en las ciencias sociales; así como, conocer y describir la opinión de los profesores universitarios sobre el mismo y su utilidad en las asesorías de tesis de pre-grado y postgrado. Para lograr este último objetivo, se utilizó un sondeo de opinión a los profesores universitarios sobre los criterios fundamentales del enfoque empírico inductivo, a saber: criterio de demarcación, inducción probabilística, lenguaje lógico y unificación de la ciencia. Los datos obtenidos del sondeo de opinión se tabularon a través de estadística descriptiva, con análisis de frecuencia. Obteniendo como conclusión que este enfoque es aún utilizado por muchos investigadores en el área de lo social, que a pesar que en el discurso muchos niegan su uso, en las asesorías de tesis lo promueven, orientando las mismas hacia un referente empírico y generalizando a partir de probabilidades y estadísticas

  8. PfEMP1 – A Parasite Protein Family of Key Importance in Plasmodium falciparum Malaria Immunity and Pathogenesis

    DEFF Research Database (Denmark)

    Hviid, Lars; Jensen, Anja T R

    2015-01-01

    to be a central element in the pathogenesis of the disease. It is mediated by the interaction of parasite ligands on the erythrocyte surface and a range of host receptor molecules in many organs and tissues. Among several proteins and protein families implicated in this process, the P. falciparum erythrocyte...... membrane protein 1 (PfEMP1) family of high-molecular weight and highly variable antigens appears to be the most prominent. In this chapter, we aim to provide a systematic overview of the current knowledge about these proteins, their structure, their function, how they are presented on the erythrocyte...

  9. Inadimplência no Brasil: Uma Análise das Evidências Empíricas

    OpenAIRE

    Mariane Daros; Nelson Guilherme Machado Pinto

    2017-01-01

    O objetivo deste trabalho consiste em analisar as evidências empíricas de estudos relacionados à inadimplência dentro do contexto brasileiro, verificando os estudos desses aspectos nas diversas regiões do país. Além disso, foram analisadas questões relacionadas ao panorama desses estudos a fim de verificar em quais pontos os trabalhos futuros desse tema podem vir a avançar. A partir da análise dos estudos publicados dentro da temática nota-se a existência de alguns pontos que não são aprofund...

  10. Assessing temporal trends and source regions of per- and polyfluoroalkyl substances (PFASs) in air under the Arctic Monitoring and Assessment Programme (AMAP)

    Science.gov (United States)

    Wong, Fiona; Shoeib, Mahiba; Katsoyiannis, Athanasios; Eckhardt, Sabine; Stohl, Andreas; Bohlin-Nizzetto, Pernilla; Li, Henrik; Fellin, Phil; Su, Yushan; Hung, Hayley

    2018-01-01

    Long-term Arctic air monitoring of per- and polyfluoroalkyl substances (PFASs) is essential in assessing their long-range transport and for evaluating the effectiveness of chemical control initiatives. We report for the first time temporal trends of neutral and ionic PFASs in air from three arctic stations: Alert (Canada, 2006-2014); Zeppelin (Svalbard, Norway, 2006-2014) and Andøya (Norway, 2010-2014). The most abundant PFASs were the perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), perfluorobutanoic acid (PFBA), and fluorotelomer alcohols (FTOHs). All of these chemicals exhibited increasing trends at Alert with doubling times (t2) of 3.7 years (y) for PFOA, 2.9 y for PFOS, 2.5 y for PFBA, 5.0 y for 8:2 FTOH and 7.0 y for 10:2 FTOH. In contrast, declining or non-changing trends, were observed for PFOA and PFOS at Zeppelin (PFOA, half-life, t1/2 = 7.2 y; PFOS t1/2 = 67 y), and Andøya (PFOA t1/2 = 1.9 y; PFOS t1/2 = 11 y). The differences in air concentrations and in time trends between the three sites may reflect the differences in regional regulations and source regions. We investigate the source region for particle associated compounds using the Lagrangian particle dispersion model FLEXPART. Model results showed that PFOA and PFOS are impacted by air masses originating from the ocean or land. For instance, PFOA at Alert and PFOS at Zeppelin were dominated by oceanic air masses whereas, PFOS at Alert and PFOA at Zeppelin were influenced by air masses transported from land.

  11. The Impacts of Climate Change on the Frozen Soil and Eco-hydrology in the Source Region of Yellow River, China

    Science.gov (United States)

    Qin, Y.; Yang, D.; Gao, B.

    2016-12-01

    The source region of Yellow River, located in the transition zone of discontinuous and continuous permafrost on the northeastern Tibetan Plateau, has experienced dramatic climate change during the past decades. The long-term changes in the seasonally frozen ground remarkably affected the eco-hydrological processes in the source region and the water availability in the middle and lower reaches. In this study, we employed a geomorphology-based eco-hydrological model (GBEHM) to quantitatively assess the impacts of climate change on the frozen soil and regional eco-hydrology. It was found that the air temperature has increased by 2.1 °C since the 1960s and most significantly during the recent decade (0.67 °C /10a), while there was no significant trend of the precipitation. Based on a 34-year (1981-2014) simulation, the maximum frozen soil depth was in the range of 0.7-2.1 m and decreased by 1.5-7.9 cm/10a because of the warming climate. The model simulation adequately reproduced the observed streamflow changes, including the drought period in the 1990s and wet period in the 2000s, and the variability in hydrological behavior was closely associated with the climate and landscape conditions. The vegetation responses to climate changes manifested as advancing green-up dates and increasing leaf area index at the initial stage of growing season. Our study shows that the ecohydrological processes are changing along with the frozen soil degradation in headwater areas on the Tibetan Plateau, which could influence the availability of water resources in the middle and lower reaches.

  12. Relaciones Empíricas Entre Empresas y Bancos. Una Visión Financiera Relaciones Empíricas Entre Empresas y Bancos. Una Visión Financiera

    Directory of Open Access Journals (Sweden)

    Andrea Escobar Grisales

    2003-12-01

    Full Text Available The research group on economics and business carried out the project "theoretical and empiricalaspects of firms – banks" relationship. The general objective was developing an investigationabout the channels and variables through which a relationship is establish between firms returnand performance, on one hand, and banks´ solvency and returns´ on the other.The main purpose of this paper is discussing the importance of firms´ financial management onfinancial sector credit policy establishment.El Grupo de Estudios en Economía y Empresa desarrolló, durante 2003, el proyecto Aspectosteóricos y empíricos de la relación empresas-bancos, cuyo objetivo general fue realizar una indagación sobre los canales y las variables a través de los cuales se establece una relación entre la rentabilidad y desempeño de las empresas, con la solidez y rentabilidad de los bancos (con datos de la economía colombiana para el lapso 1995-2000: para ello, se realizaron dos ejercicios, uno de carácter estadístico y otro de análisis financiero. El propósito de este artículo es presentar, en detalle, el análisis financiero de las relaciones empíricas entre bancos y empresas del sector real.

  13. A review of mortality associated with elongate mineral particle (EMP) exposure in occupational epidemiology studies of gold, talc, and taconite mining.

    Science.gov (United States)

    Mandel, Jeffrey H; Alexander, Bruce H; Ramachandran, Gurumurthy

    2016-12-01

    Mining of gold, taconite, and talc may involve exposure to elongate mineral particles (EMP). The involved EMPs are typically non-asbestiform, include dimensions that regulatory definitions exclude, and have been less studied. A review of the literature was undertaken for this exposure and occupational epidemiological studies that occur in gold, talc, and taconite mining. Quantitative EMP exposure information in these industries is incomplete. However, there are consistent findings of pneumoconiosis in each of these types of mining. A recent case-control study suggests a possible association between this exposure and mesothelioma. Lung cancer is inconsistently reported in these industries and is an unlikely outcome of non-asbestiform EMP exposure. There is evidence of cardiovascular mortality excess across all of these types of mining. Non-malignant respiratory disease and cardiovascular mortality have been consistently increased in these industries. Further investigation, including additional insights for the role of non-asbestiform EMP, is warranted. Am. J. Ind. Med. 59:1047-1060, 2016. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  14. La geografía como disciplina integral: notas teóricas y empíricas

    Directory of Open Access Journals (Sweden)

    Mauricio Herrera Rodríguez

    2010-01-01

    Full Text Available Este artículo responde al llamado a trascender las divisiones tradicionales entre Ciencias Sociales, Naturales y Humanidades y subraya cómo la Geografía ha internalizado muchos de los más recientes aportes teóricos y empíricos elaborados desde estas áreas, en un esfuerzo transdisciplinario por entender mejor la realidad socioambiental. Para darle coherencia teórica y relevancia práctica a este sincretismo intelectual, se propone un marco conceptual no reduccionista, elaborado por el geógrafo humanista Robert D. Sack (1997, 2003, 2010. Con el objetivo de ilustrar su pertinencia empírica, se discuten algunos paralelismos entre sus postulados y los propuestos por la "Evaluación de los ecosistemas del milenio" (2003 y por varios intelectuales destacados. Finalmente, se señala su potencial para responder constructivamente tanto al avasallador triunfalismo del mercado, como al relativismo desorientador y paralizante que con frecuencia domina nuestras discusiones públicas e intelectuales.

  15. De-MA: a web Database for electron Microprobe Analyses to assist EMP lab manager and users

    Science.gov (United States)

    Allaz, J. M.

    2012-12-01

    Lab managers and users of electron microprobe (EMP) facilities require comprehensive, yet flexible documentation structures, as well as an efficient scheduling mechanism. A single on-line database system for managing reservations, and providing information on standards, quantitative and qualitative setups (element mapping, etc.), and X-ray data has been developed for this purpose. This system is particularly useful in multi-user facilities where experience ranges from beginners to the highly experienced. New users and occasional facility users will find these tools extremely useful in developing and maintaining high quality, reproducible, and efficient analyses. This user-friendly database is available through the web, and uses MySQL as a database and PHP/HTML as script language (dynamic website). The database includes several tables for standards information, X-ray lines, X-ray element mapping, PHA, element setups, and agenda. It is configurable for up to five different EMPs in a single lab, each of them having up to five spectrometers and as many diffraction crystals as required. The installation should be done on a web server supporting PHP/MySQL, although installation on a personal computer is possible using third-party freeware to create a local Apache server, and to enable PHP/MySQL. Since it is web-based, any user outside the EMP lab can access this database anytime through any web browser and on any operating system. The access can be secured using a general password protection (e.g. htaccess). The web interface consists of 6 main menus. (1) "Standards" lists standards defined in the database, and displays detailed information on each (e.g. material type, name, reference, comments, and analyses). Images such as EDS spectra or BSE can be associated with a standard. (2) "Analyses" lists typical setups to use for quantitative analyses, allows calculation of mineral composition based on a mineral formula, or calculation of mineral formula based on a fixed

  16. Motricidad y cognición. Un estudio empírico

    Directory of Open Access Journals (Sweden)

    Josep Morales Aznar

    2006-12-01

    Full Text Available Esta tesis es un intento de clarificar diversos aspectos sobre las dimensiones que abarca la Educación. La motricidad y la cognición son dos de estas dimensiones educativas sobre las cuales existe un amplio debate, tanto en su definición como en su posible interdependencia. Este trabajo no se centra en debates teóricos, sino que intenta aportar datos empíricos sobre dicha realidad. Dichos datos se aportan a partir de 3 estudios sobre población escolar, en cada uno de ellos la muestra se segmenta a partir del tipo de actividad física desarrollada: En el primer estudio se aplican un total de 6 pruebas a 487 sujetos de entre 9 y 16 años. Los ámbitos a los que pertenecen las pruebas son: perceptivo-motor, expresión gráfica y rendimiento académico. La segmentación de la muestra más interesante que se realiza en este estudio es la distinción entre los individuos que realizan actividades extraescolares y los que no. El segundo estudio se realiza también con población escolar, pero en este caso son 241 individuos que practican deporte de alto rendimiento. Las pruebas aplicadas son las mismas que en el estudio anterior pero añadiendo dos pruebas del ámbito técnico-táctico. El tercer estudio es un trabajo meramente estadístico, ya que la muestra corresponde a los dos anteriores, en el que se realiza una comparación sobre los datos más relevantes. Posteriormente, en el apartado de conclusiones y discusión, se ofrecen aportaciones que giran alrededor de los vínculos que se pueden establecer entre los di­ferentes ámbitos y la implicación que tiene el tipo de práctica física desarrollada en relación con las pruebas analizadas. En concreto, se confirma una evolución de los resultados de todas las pruebas en consonancia con el aumento de la edad de los sujetos. No queda definida la relación entre la operatividad en tareas que implican a la motricidad global y las que implican a la motricidad fina. El ámbito de la motricidad

  17. Una Evaluación Empírica del Fondo de Comercio

    Directory of Open Access Journals (Sweden)

    Manuel Larrán Jorge

    2000-06-01

    Full Text Available En el presente trabajo se analizará bajo una perspectiva empírica uno de los activos empresariales más controvertidos como es el fondo de comercio. Dicha controversia no se materializa únicamente en su definición, sino también en su cuantificación y tratamiento contable, dando lugar en los últimos años a una importante línea de investigación centrada en la relevancia valorativa del fondo de comercio en particular y de los intangibles en general. Nuestro trabajo plantea un doble objetivo: en primer lugar, estudiar los efectos económicos ocasionados por tratamientos contables alternativos del fondo de comercio, mediante el análisis de la sensibilidad de determinados ratios ante las diversas opciones contables existentes; y, en segundo término, verificar la relevancia valorativa del fondo de comercio desde la perspectiva del mercado de capitales. Para la realización del trabajo hemos utilizado información contable de grupos de empresas españoles e información bursátil correspondiente a la dominante para los ejercicios 1991-1997.Las conclusiones básicas obtenidas se centran en que el análisis empresarial basado en ratios puede verse afectado por el tratamiento contable a que se haya sometido al fondo de comercio. Por otra parte, se obtienen evidencias del incremento en el tiempo de la relevancia valorativa del fondo de comercio en el mercado bursátil español, así como de la dependencia de dicha relevancia de ciertos factores contextuales como el nivel de resultados, la participación del fondo de comercio en el total de activo, etc. This paper analyses from an empirical perspective one of the most controversial of company assets, namely goodwill. The controversial nature of goodwill lies not only in its definition but also in its quantification and accounting treatment, giving rise in recent years to an important line of research centred on the value relevance of goodwill in particular and intangibles in general.The paper has

  18. α2-macroglobulin can crosslink multiple Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) molecules and may facilitate adhesion of parasitized erythrocytes

    DEFF Research Database (Denmark)

    Stevenson, Liz; Laursen, Erik; Cowan, Graeme J

    2015-01-01

    -macroglobulin (α2M), which is both required and sufficient for rosetting mediated by the PfEMP1 protein HB3VAR06 and some other rosette-mediating PfEMP1 proteins. We map the α2M binding site to the C terminal end of HB3VAR06, and demonstrate that α2M can bind at least four HB3VAR06 proteins, plausibly....... Together, our results are evidence that P. falciparum parasites exploit α2M (and IgM) to expand the repertoire of host receptors available for PfEMP1-mediated IE adhesion, such as the erythrocyte carbohydrate moieties that lead to formation of rosettes. It is likely that this mechanism also affects IE...

  19. An experimental and petrologic investigation of the source regions of lunar magmatism in the context of the primordial differentiation of the moon

    Science.gov (United States)

    Elardo, Stephen M.

    The primordial differentiation of the Moon via a global magma ocean has become the paradigm under which all lunar data are interpreted. The success of this model in explaining multiple geochemical, petrologic, and isotopic characteristics lunar geology has led to magma oceans becoming the preferred model for the differentiation of Earth, Mars, Mercury, Vesta, and other large terrestrial bodies. The goal of this work is to combine petrologic analyses of lunar samples with high pressure, high temperature petrologic experiments to place new and detailed constraints the petrogenetic processes that operated during different stages of lunar magmatism, the processes that have acted upon these magmas to obscure their relationship to their mantle source regions, and how those source regions fit into the context of the lunar magma ocean model. This work focuses on two important phases of lunar magmatism: the ancient crust-building plutonic lithologies of the Mg-suite dating to ~4.3 Ga, and the most recent known mare basaltic magmas dating to ~3 Ga. These samples provide insight into the petrogenesis of magmas and interior thermal state when the Moon was a hot, juvenile planet, and also during the last gasps of magmatism from a cooling planet. Chapter 1, focusing on Mg-suite troctolite 76535, presents data on chromite symplectites, olivine-hosted melt inclusions, intercumulus mineral assemblages, and cumulus mineral chemistry to argue that the 76535 was altered by metasomatism by a migrating basaltic melt. This process could effectively raise radioisotope systems above their mineral-specific blocking temperatures and help explain some of the Mg-suite-FAN age overlap. Chapter 2 focuses on lunar meteorites NWA 4734, 032, and LAP 02205, which are 3 of the 5 youngest igneous samples from the Moon. Using geochemical and isotopic data combined with partial melting models, it is shown that these basalts do not have a link to the KREEP reservoir, and a model is presented for low

  20. Effects of two Asian sand dusts transported from the dust source regions of Inner Mongolia and northeast China on murine lung eosinophilia

    Energy Technology Data Exchange (ETDEWEB)

    He, Miao, E-mail: hemiao.cmu@gmail.com [Environment and Chronic Non-communicable Disease Research Center, College of Public Health, China Medical University, 11001 Shenyang (China); Department of Health Sciences, Oita University of Nursing and Health Sciences, 870-1201 Oita (Japan); Ichinose, Takamichi, E-mail: ichinose@oita-nhs.ac.jp [Department of Health Sciences, Oita University of Nursing and Health Sciences, 870-1201 Oita (Japan); Song, Yuan, E-mail: freude@med.uoeh-u.ac.jp [Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahata-nishi-ku, Kitakyushu, 807-8555 Fukuoka (Japan); Yoshida, Yasuhiro, E-mail: songyuan1107@163.com [Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahata-nishi-ku, Kitakyushu, 807-8555 Fukuoka (Japan); Arashidani, Keiichi, E-mail: arashi@snow.ocn.ne.jp [Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Iseigaoka, Yahata-nishi-ku, Kitakyushu, 807-8555 Fukuoka (Japan); Yoshida, Seiichi, E-mail: syoshida@oita-nhs.ac.jp [Department of Health Sciences, Oita University of Nursing and Health Sciences, 870-1201 Oita (Japan); Liu, Boying, E-mail: boyingliu321@gmail.com [Environment and Chronic Non-communicable Disease Research Center, College of Public Health, China Medical University, 11001 Shenyang (China); Department of Health Sciences, Oita University of Nursing and Health Sciences, 870-1201 Oita (Japan); Nishikawa, Masataka, E-mail: mnishi@nies.go.jp [Environmental Chemistry Division, National Institute for Environmental Studies, 305-8506 Tsukuba, Ibaraki (Japan); Takano, Hirohisa, E-mail: htakano@health.env.kyoto-u.ac.jp [Environmental Health Division, Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto 615-8530 (Japan); and others

    2013-11-01

    The quality and quantity of toxic materials adsorbed onto Asian sand dust (ASD) are different based on dust source regions and passage routes. The aggravating effects of two ASDs (ASD1 and ASD2) transported from the source regions of Inner Mongolia and northeast China on lung eosinophilia were compared to clarify the role of toxic materials in ASD. The ASDs contained different amounts of lipopolysaccharides (LPS) and β-glucan (ASD1 < ASD2) and SiO{sub 2} (ASD1 > ASD2). CD-1 mice were instilled intratracheally with ASD1, ASD2 and/or ovalbumin (OVA) four times at 2-week intervals. ASD1 and ASD2 enhanced eosinophil recruitment induced by OVA in the submucosa of the airway, with goblet cell proliferation in the bronchial epithelium. ASD1 and ASD2 synergistically increased OVA-induced eosinophil-relevant cytokines interleukin-5 (IL-5), IL-13 (ASD1 < ASD2) and chemokine eotaxin (ASD1 > ASD2) in bronchoalveolar lavage fluid. ASD2 aggravating effects on lung eosinophilia were greater than ASD1. The role of LPS and β-glucan in ASD2 on the production of pro-inflammatory mediators was assessed using in vitro bone marrow-derived macrophages (BMDMs) from wild type, Toll-like receptor 2-deficient (TLR2 −/−), TLR4 −/−, and MyD88 −/− mice (on Balb/c background). ASD2-stimulated TLR2 −/− BMDMs enhanced IL-6, IL-12, TNF-α, MCP-1 and MIP-1α secretion compared with ASD2-stimulated TLR4 −/− BMDMs. Protein expression from ASD2-stimulated MyD88 −/− BMDM were very low or undetectable. The in vitro results indicate that lung eosinophilia caused by ASD is TLR4 dependent. Therefore, the aggravation of OVA-related lung eosinophilia by ASD may be dependent on toxic substances derived from microbes, such as LPS, rather than SiO{sub 2}. - Highlights: • Asian sand dust (ASD) from the deserts of China causes serious respiratory problems. • The aggravating effects of two ASDs on lung eosinophilia were compared. • The ASDs contained different LPS and β-glucan (ASD1

  1. Effects of two Asian sand dusts transported from the dust source regions of Inner Mongolia and northeast China on murine lung eosinophilia

    International Nuclear Information System (INIS)

    He, Miao; Ichinose, Takamichi; Song, Yuan; Yoshida, Yasuhiro; Arashidani, Keiichi; Yoshida, Seiichi; Liu, Boying; Nishikawa, Masataka; Takano, Hirohisa

    2013-01-01

    The quality and quantity of toxic materials adsorbed onto Asian sand dust (ASD) are different based on dust source regions and passage routes. The aggravating effects of two ASDs (ASD1 and ASD2) transported from the source regions of Inner Mongolia and northeast China on lung eosinophilia were compared to clarify the role of toxic materials in ASD. The ASDs contained different amounts of lipopolysaccharides (LPS) and β-glucan (ASD1 2 (ASD1 > ASD2). CD-1 mice were instilled intratracheally with ASD1, ASD2 and/or ovalbumin (OVA) four times at 2-week intervals. ASD1 and ASD2 enhanced eosinophil recruitment induced by OVA in the submucosa of the airway, with goblet cell proliferation in the bronchial epithelium. ASD1 and ASD2 synergistically increased OVA-induced eosinophil-relevant cytokines interleukin-5 (IL-5), IL-13 (ASD1 ASD2) in bronchoalveolar lavage fluid. ASD2 aggravating effects on lung eosinophilia were greater than ASD1. The role of LPS and β-glucan in ASD2 on the production of pro-inflammatory mediators was assessed using in vitro bone marrow-derived macrophages (BMDMs) from wild type, Toll-like receptor 2-deficient (TLR2 −/−), TLR4 −/−, and MyD88 −/− mice (on Balb/c background). ASD2-stimulated TLR2 −/− BMDMs enhanced IL-6, IL-12, TNF-α, MCP-1 and MIP-1α secretion compared with ASD2-stimulated TLR4 −/− BMDMs. Protein expression from ASD2-stimulated MyD88 −/− BMDM were very low or undetectable. The in vitro results indicate that lung eosinophilia caused by ASD is TLR4 dependent. Therefore, the aggravation of OVA-related lung eosinophilia by ASD may be dependent on toxic substances derived from microbes, such as LPS, rather than SiO 2 . - Highlights: • Asian sand dust (ASD) from the deserts of China causes serious respiratory problems. • The aggravating effects of two ASDs on lung eosinophilia were compared. • The ASDs contained different LPS and β-glucan (ASD1 2 (ASD1 > ASD2). • The ASD2 aggravating effects on lung

  2. Long-term trends of black carbon and sulphate aerosol in the Arctic: changes in atmospheric transport and source region emissions

    Directory of Open Access Journals (Sweden)

    D. Hirdman

    2010-10-01

    Full Text Available As a part of the IPY project POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate, Chemistry, Aerosols and Transport and building on previous work (Hirdman et al., 2010, this paper studies the long-term trends of both atmospheric transport as well as equivalent black carbon (EBC and sulphate for the three Arctic stations Alert, Barrow and Zeppelin. We find a general downward trend in the measured EBC concentrations at all three stations, with a decrease of −2.1±0.4 ng m−3 yr−1 (for the years 1989–2008 and −1.4±0.8 ng m−3 yr−1 (2002–2009 at Alert and Zeppelin respectively. The decrease at Barrow is, however, not statistically significant. The measured sulphate concentrations show a decreasing trend at Alert and Zeppelin of −15±3 ng m−3 yr−1 (1985–2006 and −1.3±1.2 ng m−3 yr−1 (1990–2008 respectively, while there is no trend detectable at Barrow.

    To reveal the contribution of different source regions on these trends, we used a cluster analysis of the output of the Lagrangian particle dispersion model FLEXPART run backward in time from the measurement stations. We have investigated to what extent variations in the atmospheric circulation, expressed as variations in the frequencies of the transport from four source regions with different emission rates, can explain the long-term trends in EBC and sulphate measured at these stations. We find that the long-term trend in the atmospheric circulation can only explain a minor fraction of the overall downward trend seen in the measurements of EBC (0.3–7.2% and sulphate (0.3–5.3% at the Arctic stations. The changes in emissions are dominant in explaining the trends. We find that the highest EBC and sulphate concentrations are associated with transport from Northern Eurasia and decreasing emissions in this region drive the

  3. Source Regions of the Interplanetary Magnetic Field and Variability in Heavy-Ion Elemental Composition in Gradual Solar Energetic Particle Events

    Science.gov (United States)

    Ko, Yuan-Kuen; Tylka, Allan J.; Ng, Chee K.; Wang, Yi-Ming; Dietrich, William F.

    2013-01-01

    Gradual solar energetic particle (SEP) events are those in which ions are accelerated to their observed energies by interactions with a shock driven by a fast coronal mass-ejection (CME). Previous studies have shown that much of the observed event-to-event variability can be understood in terms of shock speed and evolution in the shock-normal angle. But an equally important factor, particularly for the elemental composition, is the origin of the suprathermal seed particles upon which the shock acts. To tackle this issue, we (1) use observed solar-wind speed, magnetograms, and the PFSS model to map the Sun-L1 interplanetary magnetic field (IMF) line back to its source region on the Sun at the time of the SEP observations; and (2) then look for correlation between SEP composition (as measured by Wind and ACE at approx. 2-30 MeV/nucleon) and characteristics of the identified IMF-source regions. The study is based on 24 SEP events, identified as a statistically-significant increase in approx. 20 MeV protons and occurring in 1998 and 2003-2006, when the rate of newly-emergent solar magnetic flux and CMEs was lower than in solar-maximum years and the field-line tracing is therefore more likely to be successful. We find that the gradual SEP Fe/O is correlated with the field strength at the IMF-source, with the largest enhancements occurring when the footpoint field is strong, due to the nearby presence of an active region. In these cases, other elemental ratios show a strong charge-to-mass (q/M) ordering, at least on average, similar to that found in impulsive events. These results lead us to suggest that magnetic reconnection in footpoint regions near active regions bias the heavy-ion composition of suprathermal seed ions by processes qualitatively similar to those that produce larger heavy-ion enhancements in impulsive SEP events. To address potential technical concerns about our analysis, we also discuss efforts to exclude impulsive SEP events from our event sample.

  4. The effects of corona on current surges induced on conducting lines by EMP: A comparison of experiment data with results of analytic corona models

    Science.gov (United States)

    Blanchard, J. P.; Tesche, F. M.; McConnell, B. W.

    1987-09-01

    An experiment to determine the interaction of an intense electromagnetic pulse (EMP), such as that produced by a nuclear detonation above the Earth's atmosphere, was performed in March, 1986 at Kirtland Air Force Base near Albuquerque, New Mexico. The results of that experiment have been published without analysis. Following an introduction of the corona phenomenon, the reason for interest in it, and a review of the experiment, this paper discusses five different analytic corona models that may model corona formation on a conducting line subjected to EMP. The results predicted by these models are compared with measured data acquired during the experiment to determine the strengths and weaknesses of each model.

  5. Implicaciones teóricas y empíricas de la nueva definición de desempleo en Colombia.

    OpenAIRE

    Guataquí, Juan; Taborda, Rodrigo

    2005-01-01

    En junio de 2000 Colombia adoptó una nueva definición de desempleo siguiendo los estándares de la OIT. Este cambio implicó una reducción de la tasa de desempleo del orden de dos puntos porcentuales. En este documento contrastamos el caso Colombiano con las experiencias de otros países en términos de la transformación metodológica y sus implicaciones empíricas. Posteriormente, evaluamos el soporte empírico del cambio de metodología. Nuestros resultados sugieren implicaciones esp...

  6. Inventory parameters

    CERN Document Server

    Sharma, Sanjay

    2017-01-01

    This book provides a detailed overview of various parameters/factors involved in inventory analysis. It especially focuses on the assessment and modeling of basic inventory parameters, namely demand, procurement cost, cycle time, ordering cost, inventory carrying cost, inventory stock, stock out level, and stock out cost. In the context of economic lot size, it provides equations related to the optimum values. It also discusses why the optimum lot size and optimum total relevant cost are considered to be key decision variables, and uses numerous examples to explain each of these inventory parameters separately. Lastly, it provides detailed information on parameter estimation for different sectors/products. Written in a simple and lucid style, it offers a valuable resource for a broad readership, especially Master of Business Administration (MBA) students.

  7. Monitoring of "all-weather" evapotranspiration using optical and passive microwave remote sensing imagery over the River Source Region in Southwest China

    Science.gov (United States)

    Ma, Y.; Liu, S.

    2017-12-01

    Accurate estimation of surface evapotranspiration (ET) with high quality is one of the biggest obstacles for routine applications of remote sensing in eco-hydrological studies and water resource management at basin scale. However, many aspects urgently need to deeply research, such as the applicability of the ET models, the parameterization schemes optimization at the regional scale, the temporal upscaling, the selecting and developing of the spatiotemporal data fusion method and ground-based validation over heterogeneous land surfaces. This project is based on the theoretically robust surface energy balance system (SEBS) model, which the model mechanism need further investigation, including the applicability and the influencing factors, such as local environment, and heterogeneity of the landscape, for improving estimation accuracy. Due to technical and budget limitations, so far, optical remote sensing data is missing due to frequent cloud contamination and other poor atmospheric conditions in Southwest China. Here, a multi-source remote sensing data fusion method (ESTARFM: Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model) method will be proposed through blending multi-source remote sensing data acquired by optical, and passive microwave remote sensors on board polar satellite platforms. The accurate "all-weather" ET estimation will be carried out for daily ET of the River Source Region in Southwest China, and then the remotely sensed ET results are overlapped with the footprint-weighted images of EC (eddy correlation) for ground-based validation.

  8. Isotopic clues to magmatic source regions for neogene Andean volcanic rocks in the El Teniente area near 38oS latitude

    International Nuclear Information System (INIS)

    Kay, Suzanne Mahlburg; Kurtz, A.C

    2001-01-01

    The origin of isotopic variations in Central Andean arc lavas is a long-standing problem that involves identifying mantle and crustal source regions. Advances have come from analyzing temporal and spatial variations in constrained tectonic settings. The purpose here is to highlight the similarities of temporal variations in an east-west transect of Neogene magmatic units near 34 O S latitude with those from a south-north transect along the modern Southern Volcanic Zone (SVZ, e.g. Hildreth and Moorbath 1988, Tormey et al. 1991). The comparison shows the importance of crustal thickening processes associated with compressional shortening and of lithospheric scale adjustments associated with eastward migration of the arc front on magma sources. Sr, Nd and Pb isotopic analyses of 27 Neogene volcanic and plutonic samples from the El Teniente area are presented in Table 1 and plotted along with some analyses from Skewes and Stern (1994) and Stern and Skewes (1995) in Figure 2. The data show a clear progression from older samples with more 'depleted' isotopic signatures (lower 87 Sr/ 86 Sr and Pb isotopic ratios, higher εNd) to younger samples with more 'enriched' signatures (higher 87 Sr/ 86 Sr and Pb isotopic ratios, lower εNd). In detail, four temporal and spatial groups marked by discontinuities in isotopic trends can be defined. Within each group, εNd tends to decrease and 87 Sr/ 86 Sr ratios to increase with SiO2 concentration (au)

  9. Surface co-expression of two different PfEMP1 antigens on single Plasmodium falciparum-infected erythrocytes facilitates binding to ICAM1 and PECAM1

    DEFF Research Database (Denmark)

    Joergensen, Louise; Bengtsson, Dominique C; Bengtsson, Anja

    2010-01-01

    The Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) antigens play a major role in cytoadhesion of infected erythrocytes (IE), antigenic variation, and immunity to malaria. The current consensus on control of variant surface antigen expression is that only one PfEMP1 encoded by one var...

  10. Antibodies against PfEMP1, RIFIN, MSP3 and GLURP are acquired during controlled Plasmodium falciparum malaria infections in naïve volunteers

    DEFF Research Database (Denmark)

    Turner, Louise; Wang, Christian W; Lavstsen, Thomas

    2011-01-01

    Antibodies to polymorphic antigens expressed during the parasites erythrocytic stages are important mediators of protective immunity against P. falciparum malaria. Therefore, polymorphic blood stage antigens like MSP3, EBA-175 and GLURP and variant surface antigens PfEMP1 and RIFIN are considered...

  11. Structure-guided identification of a family of dual receptor-binding PfEMP1 that is associated with cerebral malaria

    DEFF Research Database (Denmark)

    Lennartz, Frank; Adams, Yvonne; Bengtsson, Anja

    2017-01-01

    Cerebral malaria is a deadly outcome of infection by Plasmodium falciparum, occurring when parasite-infected erythrocytes accumulate in the brain. These erythrocytes display parasite proteins of the PfEMP1 family that bind various endothelial receptors. Despite the importance of cerebral malaria...

  12. Mapping the binding site of a cross-reactive Plasmodium falciparum PfEMP1 monoclonal antibody inhibitory of ICAM-1 binding

    DEFF Research Database (Denmark)

    Lennartz, Frank; Bengtsson, Anja; Olsen, Rebecca W

    2015-01-01

    The virulence of Plasmodium falciparum is linked to the ability of infected erythrocytes (IE) to adhere to the vascular endothelium, mediated by P. falciparum erythrocyte membrane protein 1 (PfEMP1). In this article, we report the functional characterization of an mAb that recognizes a panel of P...

  13. Antibody reactivity to conserved linear epitopes of Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1)

    DEFF Research Database (Denmark)

    Staalsø, T; Khalil, E A; Elhassan, I M

    1998-01-01

    recognising the conserved regions of PfEMP1 arise upon exposure to the parasite, and that these may be involved in the development of protection against malaria. Antibodies to the Pfalhesin peptide of the human aniontransporter, band3, were measured by the same method. The magnitude of this antibody response...

  14. Antibodies to ICAM1-binding PfEMP1-DBLβ are biomarkers of protective immunity to malaria in a cohort of young children from Papua New Guinea

    DEFF Research Database (Denmark)

    Tessema, Sofonias K; Utama, Digjaya; Chesnokov, Olga

    2018-01-01

    Plasmodium falciparum Erythrocyte Membrane Protein 1 (PfEMP1) mediates parasite sequestration to the cerebral microvasculature via binding of DBLβ domains to Intercellular Adhesion Molecule 1 (ICAM1) and is associated with severe cerebral malaria. In a cohort of 187 young children from Papua New ...

  15. The subduction erosion and mantle source region contamination model of Andean arc magmatism: Isotopic evidence from igneous rocks of central Chile

    International Nuclear Information System (INIS)

    Stern, Charles R

    2001-01-01

    Continental crust may be incorporated in mantle-derived Andean magmas as these magmas rise through the crust (Hildreth and Moorbath, 1988), or alternatively, crust may be tectonically transported into the mantle by subduction of trench sediments and subduction erosion of the continental margin, and then added into the mantle source region of Andean magmas (Stern, 1991). Since the mantle has relatively low Sr, Nd, and Pb concentrations compared to continental crust, differences in the isotopic compositions of magmas erupted in different region of the Andes may be produced by relatively small differences in the amount of subducted crust added to the mantle source region of these magmas. By comparison, significantly larger amounts of crust must be assimilated by mantle-derived magmas to produce isotopic differences of similar magnitude. Therefore, constraining the process by which continental crust is incorporated in Andean magmas has important implications for understanding the chemical cycling that takes place in the Andean subduction-related magma factory. Isotopic data suggest the incorporation of a greater proportion of crust in Andean magmas erupted at the northern portion of the Southern Volcanic Zone of central Chile compared to those erupted in the southern portion of the Southern Volcanic Zone of south central Chile (SSVZ) (Stern et al., 1984; Futa and Stern, 1988; Hildreth and Moorbath, 1988). The NSVZ occurs just south of the current locus of the subduction of the Juan Fernandez Ridge. The southward migration of the locus of subduction of this ridge has resulted in decreasing subduction angle below the NSVZ, the eastward migration of the volcanic front of the Andean arc, and an increase in the crustal thickness below the arc. These factors together have caused changes, since the middle Miocene, in the isotopic composition of Andean igneous rocks of central Chile. The data indicate a close chronologic relation between the southward migrations of the locus

  16. Use of Lagrangian transport models and Sterilized High Volume Sampling to pinpoint the source region of Kawasaki disease and determine the etiologic agent

    Science.gov (United States)

    Curcoll Masanes, Roger; Rodó, Xavier; Anton, Jordi; Ballester, Joan; Jornet, Albert; Nofuentes, Manel; Sanchez-Manubens, Judith; Morguí, Josep-Anton

    2015-04-01

    Kawasaki disease (KD) is an acute, coronary artery vasculitis of young children, and still a medical mystery after more than 40 years. A former study [Rodó et al. 2011] demonstrated that certain patterns of winds in the troposphere above the earth's surface flowing from Asia were associated with the times of the annual peak in KD cases and with days having anomalously high numbers of KD patients. In a later study [Rodó et al. 2014], we used residence times from an Air Transport Model to pinpoint the source region for KD. Simulations were generated from locations spanning Japan from days with either high or low KD incidence. In order to cope with stationarity of synoptic situations, only trajectories for the winter months, when there is the maximum in KD cases, were considered. Trajectories traced back in time 10 days for each dataset and location were generated using the flexible particle Lagrangian dispersion model (FLEXPART Version 8.23 [Stohl et al. 2005]) run in backward mode. The particles modeled were air tracers, with 10,000 particles used on each model run. The model output used was residence time, with an output grid of 0.5° latitude × longitude and a time resolution of 3 h. The data input used for the FLEXPART model was gridded atmospheric wind velocity from the European Center for Medium-Range Weather Forecasts Re-Analysis (ERA-Interim at 1°). Aggregates of winter period back-trajectories were calculated for three different regions of Japan. A common source of wind air masses was located for periods with High Kawasaki disease. Knowing the trajectories of winds from the air transport models, a sampling methodology was developed in order to capture the possible etiological agent or other tracers that could have been released together. This methodology is based on the sterilized filtering of high volumes of the transported air at medium tropospheric levels by aircraft sampling and a later analyze these filters with adequate techniques. High purity

  17. Changing characteristics of land use and ecological service value in the water source region of the Middle Route of South-to-North Water Transfer Project

    Science.gov (United States)

    Tang, Jian; Zhai, Wenliang; Cao, Huiqun

    2017-08-01

    Research on changing characteristics of land use and ecological service value (ESV) can guide the regional land use planning and promote the rational use of environmental resources. On the basis of four phases of land-use data (2000, 2005, 2010 and 2015), this research analysed the changing characteristics of land use and ESV in the water source region of the Middle Route of South-to-North Water Transfer Project (SRMRP). The results showed that forest, grassland and cultivated land were the major land-use types in the SRMRP. During 2000∼2015, forest, grassland, farmland and wetland decreased. Construction land and bare land had increased, and the annual increase rates reached 3.6% and 8%, respectively. After the implementation of the water transfer project in 2003, water area was also increasing. The total ESV in the SRMRP is about 196 billion CNY, and mainly comes from the contributions of forest, grassland and farmland. During 2000∼2015, farmland shrinks leaded to the declines in value from supply service. With increasing in water and construction land, value from entertainment and cultural service increased. During the early stage of the water transfer project, value from regulation and support services increased due to the increase in water. With the decreasing in wetland and the increasing in construction land, the negative effects on the regulation and support services were increasing, and value from regulation and support services were therefore decreasing. During the process of resource exploitation and management, more attentions should be paid to the total control of construction land and wetland protection in the SRMRP.

  18. Response of streamflow to climate change in a sub-basin of the source region of the Yellow River based on a tank model

    Directory of Open Access Journals (Sweden)

    P. Wu

    2018-06-01

    Full Text Available Though extensive researches were conducted in the source region of the Yellow River (SRYR to analyse climate change influence on streamflow, however, few researches concentrate on streamflow of the sub-basin above the Huangheyan station in the SRYR (HSRYR where a water retaining dam was built in the outlet in 1999. To improve the reservoir regulation strategies, this study analysed streamflow change of the HSRYR in a mesoscale. A tank model (TM was proposed and calibrated with monthly observation streamflow from 1991 to 1998. In the validation period, though there is a simulation deviation during the water storage and power generation period, simulated streamflow agrees favourably with observation data from 2008 to 2013. The model was further validated by two inside lakes area obtained from Landsat 5, 7, 8 datasets from 2000 to 2014, and significant correlations were found between the simulated lake outlet runoff and respective lake area. Then 21 Global Climate Models (GCM ensembled data of three emission scenarios (SRA2, SRA1B and SRB1 were downscaled and used as input to the TM to simulate the runoff change of three benchmark periods 2011–2030 (2020s, 2046–2065 (2050s, 2080–2099 (2090s, respectively. Though temperature increase dramatically, these projected results similarly indicated that streamflow shows an increase trend in the long term. Runoff increase is mainly caused by increasing precipitation and decreasing evaporation. Water resources distribution is projected to change from summer-autumn dominant to autumn winter dominant. Annual lowest runoff will occur in May caused by earlier snow melting and increasing evaporation in March. According to the obtained results, winter runoff should be artificially stored by reservoir regulation in the future to prevent zero-flow occurrent in May. This research is helpful for water resources management and provides a better understand of streamflow change caused by climate change in the

  19. Response of streamflow to climate change in a sub-basin of the source region of the Yellow River based on a tank model

    Science.gov (United States)

    Wu, Pan; Wang, Xu-Sheng; Liang, Sihai

    2018-06-01

    Though extensive researches were conducted in the source region of the Yellow River (SRYR) to analyse climate change influence on streamflow, however, few researches concentrate on streamflow of the sub-basin above the Huangheyan station in the SRYR (HSRYR) where a water retaining dam was built in the outlet in 1999. To improve the reservoir regulation strategies, this study analysed streamflow change of the HSRYR in a mesoscale. A tank model (TM) was proposed and calibrated with monthly observation streamflow from 1991 to 1998. In the validation period, though there is a simulation deviation during the water storage and power generation period, simulated streamflow agrees favourably with observation data from 2008 to 2013. The model was further validated by two inside lakes area obtained from Landsat 5, 7, 8 datasets from 2000 to 2014, and significant correlations were found between the simulated lake outlet runoff and respective lake area. Then 21 Global Climate Models (GCM) ensembled data of three emission scenarios (SRA2, SRA1B and SRB1) were downscaled and used as input to the TM to simulate the runoff change of three benchmark periods 2011-2030 (2020s), 2046-2065 (2050s), 2080-2099 (2090s), respectively. Though temperature increase dramatically, these projected results similarly indicated that streamflow shows an increase trend in the long term. Runoff increase is mainly caused by increasing precipitation and decreasing evaporation. Water resources distribution is projected to change from summer-autumn dominant to autumn winter dominant. Annual lowest runoff will occur in May caused by earlier snow melting and increasing evaporation in March. According to the obtained results, winter runoff should be artificially stored by reservoir regulation in the future to prevent zero-flow occurrent in May. This research is helpful for water resources management and provides a better understand of streamflow change caused by climate change in the future.

  20. Holocene deltaic succession recording millennium-scale subsidence trend near the source region of the 2011 Tohoku-oki earthquake: An example from the Tsugaruishi plain, northeast Japan

    Science.gov (United States)

    Niwa, Y.; Sugai, T.; Matsushima, Y.; Toda, S.

    2017-12-01

    For clarification of megathrust earthquake cycle with recurrence interval of several hundreds to about a thousand years, crustal movement trend on a timescale of 103-104 years can be basic and important data. Well-dated Holocene sedimentary succession provides useful information for estimation of crustal movement trend on a timescale of 103 - 104 years. Here we collected three sediment cores, TGI1, TGI2, and TGI3, from the Tsugaruishi delta plain on the central Sanriku coast, which is near the source region of the 2011 Tohoku-oki earthquake and where discrepancies in crustal movement have been reported between uplift on a timescale of 105 years inferred from marine terrace versus subsidence on a timescale of 101-102 years from geodetic measurement. We recognized a Holocene deltaic succession in all three cores; basal gravel of alluvium, floodplain sand and mud, inner bay mud, prodelta delta front sand and mud, and fluvial sand and gravel, from lower to upper. In core TGI3, from the farthest inland site, the intertidal sediment facies, deposited from 7500 to 7000 cal BP, and the overlying 6-m-thick delta to floodplain facies, deposited from 7000 to 5000 cal BP, are both below the present sea level. Because a sea-level highstand due to hydroisostatic uplift around Japan occurred in the mid-Holocene, we inferred that the Tsugaruishi plain subsided during the Holocene, and the estimated subsidence rate, 1.1-1.9 mm/yr at maximum, is consistent with the recently reported subsidence rate along the southern Sanriku coast. The results of this study confirm that the central to southern Sanriku coast is subsiding, in contrast to an interpretation based on the study of marine terraces that this part of the coast is uplifting. The Holocene deltaic succession presented here will be useful for constructing an earthquake cycle model related to plate subduction.

  1. Evaluating a Space-Based Indicator of Surface Ozone-NO x -VOC Sensitivity Over Midlatitude Source Regions and Application to Decadal Trends.

    Science.gov (United States)

    Jin, Xiaomeng; Fiore, Arlene M; Murray, Lee T; Valin, Lukas C; Lamsal, Lok N; Duncan, Bryan; Boersma, K Folkert; De Smedt, Isabelle; Abad, Gonzalo Gonzalez; Chance, Kelly; Tonnesen, Gail S

    2017-10-16

    Determining effective strategies for mitigating surface ozone (O 3 ) pollution requires knowledge of the relative ambient concentrations of its precursors, NO x , and VOCs. The space-based tropospheric column ratio of formaldehyde to NO 2 (FNR) has been used as an indicator to identify NO x -limited versus NO x -saturated O 3 formation regimes. Quantitative use of this indicator ratio is subject to three major uncertainties: (1) the split between NO x -limited and NO x -saturated conditions may shift in space and time, (2) the ratio of the vertically integrated column may not represent the near-surface environment, and (3) satellite products contain errors. We use the GEOS-Chem global chemical transport model to evaluate the quantitative utility of FNR observed from the Ozone Monitoring Instrument over three northern midlatitude source regions. We find that FNR in the model surface layer is a robust predictor of the simulated near-surface O 3 production regime. Extending this surface-based predictor to a column-based FNR requires accounting for differences in the HCHO and NO 2 vertical profiles. We compare four combinations of two OMI HCHO and NO 2 retrievals with modeled FNR. The spatial and temporal correlations between the modeled and satellite-derived FNR vary with the choice of NO 2 product, while the mean offset depends on the choice of HCHO product. Space-based FNR indicates that the spring transition to NO x -limited regimes has shifted at least a month earlier over major cities (e.g., New York, London, and Seoul) between 2005 and 2015. This increase in NO x sensitivity implies that NO x emission controls will improve O 3 air quality more now than it would have a decade ago.

  2. Bomb parameters

    International Nuclear Information System (INIS)

    Kerr, George D.; Young, Rebert W.; Cullings, Harry M.; Christry, Robert F.

    2005-01-01

    The reconstruction of neutron and gamma-ray doses at Hiroshima and Nagasaki begins with a determination of the parameters describing the explosion. The calculations of the air transported radiation fields and survivor doses from the Hiroshima and Nagasaki bombs require knowledge of a variety of parameters related to the explosions. These various parameters include the heading of the bomber when the bomb was released, the epicenters of the explosions, the bomb yields, and the tilt of the bombs at time of explosion. The epicenter of a bomb is the explosion point in air that is specified in terms of a burst height and a hypocenter (or the point on the ground directly below the epicenter of the explosion). The current reassessment refines the energy yield and burst height for the Hiroshima bomb, as well as the locations of the Hiroshima and Nagasaki hypocenters on the modern city maps used in the analysis of the activation data for neutrons and TLD data for gamma rays. (J.P.N.)

  3. Analysis of Water Vapour Flux Between Alpine Wetlands Underlying the Surface and Atmosphere in the Source Region of the Yellow River

    Science.gov (United States)

    Xie, Y.; Wen, J.; Liu, R.; Wang, X.; JIA, D.

    2017-12-01

    alpine wetland surface and the atmosphere system is low. The actual measurements agree with omega theory. The latent heat flux is mainly influenced by solar radiation. From the above, our study has provided reference information for exploring the influences of environmental factors on the latent heat flux over the alpine wetlands of the Yellow River source region.

  4. Analysis of Light Absorbing Aerosols in Northern Pakistan: Concentration on Snow/Ice, their Source Regions and Impacts on Snow Albedo

    Science.gov (United States)

    Gul, C.; Praveen, P. S.; Shichang, K.; Adhikary, B.; Zhang, Y.; Ali, S.

    2016-12-01

    Elemental carbon (EC) and light absorbing organic carbon (OC) are important particulate impurities in snow and ice which significantly reduce the albedo of glaciers and accelerate their melting. Snow and ice samples were collected from Karakorum-Himalayan region of North Pakistan during the summer campaign (May-Jun) 2015 and only snow samples were collected during winter (Dec 2015- Jan 2016). Total 41 surface snow/ice samples were collected during summer campaign along different elevation ranges (2569 to 3895 a.m.s.l) from six glaciers: Sachin, Henarche, Barpu, Mear, Gulkin and Passu. Similarly 18 snow samples were collected from Sust, Hoper, Tawas, Astore, Shangla, and Kalam regions during the winter campaign. Quartz filters were used for filtering of melted snow and ice samples which were then analyzed by thermal optical reflectance (TOR) method to determine the concentration of EC and OC. The average concentration of EC (ng/g), OC (ng/g) and dust (ppm) were found as follows: Passu (249.5, 536.8, 475), Barpu (1190, 397.6, 1288), Gulkin (412, 793, 761), Sachin (911, 2130, 358), Mear (678, 2067, 83) and Henarche (755, 1868, 241) respectively during summer campaign. Similarly, average concentration of EC (ng/g), OC (ng/g) and dust (ppm) was found in the samples of Sust (2506, 1039, 131), Hoper (646, 1153, 76), Tawas (650, 1320, 16), Astore (1305, 2161, 97), Shangla (739, 2079, 31) and Kalam (107, 347, 5) respectively during winter campaign. Two methods were adopted to identify the source regions: one coupled emissions inventory with back trajectories, second with a simple region tagged chemical transport modeling analysis. In addition, CALIPSO subtype aerosol composition indicated that frequency of smoke in the atmosphere over the region was highest followed by dust and then polluted dust. SNICAR model was used to estimate the snow albedo reduction from our in-situ measurements. Snow albedo reduction was observed to be 0.3% to 27.6%. The derived results were used

  5. Vegetation dynamics and its driving forces from climate change and human activities in the Three-River Source Region, China from 1982 to 2012

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Ying; Zhang, Chaobin; Wang, Zhaoqi; Chen, Yizhao; Gang, Chengcheng [School of Life Science, Nanjing University, Xianlin Road 163, Qixia District, Nanjing, 210046 (China); An, Ru [School of Earth Science and Engineering, Hohai University, Xikang Road 129, Nanjing, 210098 (China); Li, Jianlong, E-mail: lijianlongnju@163.com [School of Life Science, Nanjing University, Xianlin Road 163, Qixia District, Nanjing, 210046 (China)

    2016-09-01

    The Three-River Source Region (TRSR), a region with key importance to the ecological security of China, has undergone climate changes and a shift in human activities driven by a series of ecological restoration projects in recent decades. To reveal the spatiotemporal dynamics of vegetation dynamics and calculate the contributions of driving factors in the TRSR across different periods from 1982 to 2012, net primary productivity (NPP) estimated using the Carnegie–Ames–Stanford approach model was used to assess the status of vegetation. The actual effects of different climatic variation trends on interannual variation in NPP were analyzed. Furthermore, the relationships of NPP with different climate factors and human activities were analyzed quantitatively. Results showed the following: from 1982 to 2012, the average NPP in the study area was 187.37 g cm{sup −2} yr{sup −1}. The average NPP exhibited a fluctuation but presented a generally increasing trend over the 31-year study period, with an increase rate of 1.31 g cm{sup −2} yr{sup −2}. During the entire study period, the average contributions of temperature, precipitation, and solar radiation to NPP interannual variation over the entire region were 0.58, 0.73, and 0.09 g cm{sup −2} yr{sup −2}, respectively. Radiation was the climate factor with the greatest influence on NPP interannual variation. The factor that restricted NPP increase changed from temperature and radiation to precipitation. The average contributions of climate change and human activities to NPP interannual variation were 1.40 g cm{sup −2} yr{sup −2} and − 0.08 g cm{sup −2} yr{sup −2}, respectively. From 1982 to 2000, the general climate conditions were favorable to vegetation recovery, whereas human activities had a weaker negative impact on vegetation growth. From 2001 to 2012, climate conditions began to have a negative impact on vegetation growth, whereas human activities made a favorable impact on vegetation

  6. Vegetation dynamics and its driving forces from climate change and human activities in the Three-River Source Region, China from 1982 to 2012

    International Nuclear Information System (INIS)

    Zhang, Ying; Zhang, Chaobin; Wang, Zhaoqi; Chen, Yizhao; Gang, Chengcheng; An, Ru; Li, Jianlong

    2016-01-01

    The Three-River Source Region (TRSR), a region with key importance to the ecological security of China, has undergone climate changes and a shift in human activities driven by a series of ecological restoration projects in recent decades. To reveal the spatiotemporal dynamics of vegetation dynamics and calculate the contributions of driving factors in the TRSR across different periods from 1982 to 2012, net primary productivity (NPP) estimated using the Carnegie–Ames–Stanford approach model was used to assess the status of vegetation. The actual effects of different climatic variation trends on interannual variation in NPP were analyzed. Furthermore, the relationships of NPP with different climate factors and human activities were analyzed quantitatively. Results showed the following: from 1982 to 2012, the average NPP in the study area was 187.37 g cm"−"2 yr"−"1. The average NPP exhibited a fluctuation but presented a generally increasing trend over the 31-year study period, with an increase rate of 1.31 g cm"−"2 yr"−"2. During the entire study period, the average contributions of temperature, precipitation, and solar radiation to NPP interannual variation over the entire region were 0.58, 0.73, and 0.09 g cm"−"2 yr"−"2, respectively. Radiation was the climate factor with the greatest influence on NPP interannual variation. The factor that restricted NPP increase changed from temperature and radiation to precipitation. The average contributions of climate change and human activities to NPP interannual variation were 1.40 g cm"−"2 yr"−"2 and − 0.08 g cm"−"2 yr"−"2, respectively. From 1982 to 2000, the general climate conditions were favorable to vegetation recovery, whereas human activities had a weaker negative impact on vegetation growth. From 2001 to 2012, climate conditions began to have a negative impact on vegetation growth, whereas human activities made a favorable impact on vegetation recovery. - Highlights: • Partitioned the

  7. Aerosol Optical Properties Measured Onboard the Ronald H. Brown During ACE Asia as a Function of Aerosol Chemical Composition and Source Region

    Science.gov (United States)

    Quinn, P. K.; Coffman, D. J.; Bates, T. S.; Welton, E. J.; Covert, D. S.; Miller, T. L.; Johnson, J. E.; Maria, S.; Russell, L.; Arimoto, R.

    2004-01-01

    During the ACE Asia intensive field campaign conducted in the spring of 2001 aerosol properties were measured onboard the R/V Ronald H. Brown to study the effects of the Asian aerosol on atmospheric chemistry and climate in downwind regions. Aerosol properties measured in the marine boundary layer included chemical composition; number size distribution; and light scattering, hemispheric backscattering, and absorption coefficients. In addition, optical depth and vertical profiles of aerosol 180 deg backscatter were measured. Aerosol within the ACE Asia study region was found to be a complex mixture resulting from marine, pollution, volcanic, and dust sources. Presented here as a function of air mass source region are the mass fractions of the dominant aerosol chemical components, the fraction of the scattering measured at the surface due to each component, mass scattering efficiencies of the individual components, aerosol scattering and absorption coefficients, single scattering albedo, Angstrom exponents, optical depth, and vertical profiles of aerosol extinction. All results except aerosol optical depth and the vertical profiles of aerosol extinction are reported at a relative humidity of 55 +/- 5%. An over-determined data set was collected so that measured and calculated aerosol properties could be compared, internal consistency in the data set could be assessed, and sources of uncertainty could be identified. By taking into account non-sphericity of the dust aerosol, calculated and measured aerosol mass and scattering coefficients agreed within overall experimental uncertainties. Differences between measured and calculated aerosol absorption coefficients were not within reasonable uncertainty limits, however, and may indicate the inability of Mie theory and the assumption of internally mixed homogeneous spheres to predict absorption by the ACE Asia aerosol. Mass scattering efficiencies of non-sea salt sulfate aerosol, sea salt, submicron particulate organic

  8. Study of characterizations of aerosols in a dust storm source region and its influence on Beijing by NAA and ICP-MS

    International Nuclear Information System (INIS)

    Song Yan; Chai Zhifang; Xu Diandou; Feng Weiyue; Ouyang Hong; Mao Xueying

    2005-01-01

    Dust storms have caused many problems in the environment, health and climate. For decades, dust storms have occurred frequently in various regions of China. The dust aerosols not only affected the local atmosphere, but also contaminated the atmosphere of the circumjacent regions. Further, they could affect Korea, Japan and even USA via long-range transportation. Many researches related to Chinese dust storms have been reported, however, there are few reports on the chemical components and characters of dust aerosols at their sources. Data on chemical properties of dust storm in the dust source region can help people understand the characteristics of dust storms and their influence on local and other regions. Duolun county (42 degree 13' N, 116 degree 25' E) lies in the southeast of Inner Mongolia, China, in the south of Hunshandake sands (one of the four famous sands in China). Because it is located at windward of Beijing, the dust aerosols can affect Beijing quickly when dust storm occurs. Hence, the study of chemical compositions and elemental abundance patterns of atmospheric particulate matters at Duolun is imperative to understand its influence on Beijing's atmospheric quality. In this work, TSP and PM2.5 samples were collected in Beijing and Duolun, Inner Mongolia, China, in April and May of 2002. Monthly arithmetic averages of the mass concentrations indicated that the pollution of atmospheric particulate matter's (APM) in Duolun was very serious, especially in April. The chemical compositions of total 163 samples were analyzed by INAA and ICP-MS and their origins were identified through Enrichment Factor and Principal Component Analysis. The results showed that the main source of Duolun aerosols was soil dust, and coal combustion constituted the important anthropogenic contribution. The dust events in April and changes of local meteorological conditions were the main reasons for the differences of APM characteristics between April and May. The

  9. Diurnal and Seasonal Variations in the Net Ecosystem CO2 Exchange of a Pasture in the Three-River Source Region of the Qinghai-Tibetan Plateau.

    Directory of Open Access Journals (Sweden)

    Bin Wang

    Full Text Available Carbon dioxide (CO2 exchange between the atmosphere and grassland ecosystems is very important for the global carbon balance. To assess the CO2 flux and its relationship to environmental factors, the eddy covariance method was used to evaluate the diurnal cycle and seasonal pattern of the net ecosystem CO2 exchange (NEE of a cultivated pasture in the Three-River Source Region (TRSR on the Qinghai-Tibetan Plateau from January 1 to December 31, 2008. The diurnal variations in the NEE and ecosystem respiration (Re during the growing season exhibited single-peak patterns, the maximum and minimum CO2 uptake observed during the noon hours and night; and the maximum and minimum Re took place in the afternoon and early morning, respectively. The minimum hourly NEE rate and the maximum hourly Re rate were -7.89 and 5.03 μmol CO2 m-2 s-1, respectively. The NEE and Re showed clear seasonal variations, with lower values in winter and higher values in the peak growth period. The highest daily values for C uptake and Re were observed on August 12 (-2.91 g C m-2 d-1 and July 28 (5.04 g C m-2 day-1, respectively. The annual total NEE and Re were -140.01 and 403.57 g C m-2 year-1, respectively. The apparent quantum yield (α was -0.0275 μmol μmol-1 for the entire growing period, and the α values for the pasture's light response curve varied with the leaf area index (LAI, air temperature (Ta, soil water content (SWC and vapor pressure deficit (VPD. Piecewise regression results indicated that the optimum Ta and VPD for the daytime NEE were 14.1°C and 0.65 kPa, respectively. The daytime NEE decreased with increasing SWC, and the temperature sensitivity of respiration (Q10 was 3.0 during the growing season, which was controlled by the SWC conditions. Path analysis suggested that the soil temperature at a depth of 5 cm (Tsoil was the most important environmental factor affecting daily variations in NEE during the growing season, and the photosynthetic photon

  10. Concentrations and source regions of light-absorbing particles in snow/ice in northern Pakistan and their impact on snow albedo

    Science.gov (United States)

    Gul, Chaman; Praveen Puppala, Siva; Kang, Shichang; Adhikary, Bhupesh; Zhang, Yulan; Ali, Shaukat; Li, Yang; Li, Xiaofei

    2018-04-01

    Black carbon (BC), water-insoluble organic carbon (OC), and mineral dust are important particles in snow and ice which significantly reduce albedo and accelerate melting. Surface snow and ice samples were collected from the Karakoram-Himalayan region of northern Pakistan during 2015 and 2016 in summer (six glaciers), autumn (two glaciers), and winter (six mountain valleys). The average BC concentration overall was 2130 ± 1560 ng g-1 in summer samples, 2883 ± 3439 ng g-1 in autumn samples, and 992 ± 883 ng g-1 in winter samples. The average water-insoluble OC concentration overall was 1839 ± 1108 ng g-1 in summer samples, 1423 ± 208 ng g-1 in autumn samples, and 1342 ± 672 ng g-1 in winter samples. The overall concentration of BC, OC, and dust in aged snow samples collected during the summer campaign was higher than the concentration in ice samples. The values are relatively high compared to reports by others for the Himalayas and the Tibetan Plateau. This is probably the result of taking more representative samples at lower elevation where deposition is higher and the effects of ageing and enrichment are more marked. A reduction in snow albedo of 0.1-8.3 % for fresh snow and 0.9-32.5 % for aged snow was calculated for selected solar zenith angles during daytime using the Snow, Ice, and Aerosol Radiation (SNICAR) model. The daily mean albedo was reduced by 0.07-12.0 %. The calculated radiative forcing ranged from 0.16 to 43.45 W m-2 depending on snow type, solar zenith angle, and location. The potential source regions of the deposited pollutants were identified using spatial variance in wind vector maps, emission inventories coupled with backward air trajectories, and simple region-tagged chemical transport modeling. Central, south, and west Asia were the major sources of pollutants during the sampling months, with only a small contribution from east Asia. Analysis based on the Weather Research and Forecasting (WRF-STEM) chemical transport model identified a

  11. Evidencia Empírica sobre la Paridad del Poder Adquisitivo en México Evidencia Empírica sobre la Paridad del Poder Adquisitivo en México

    Directory of Open Access Journals (Sweden)

    Lorena Medina

    2012-02-01

    Full Text Available This article describes the application of methods recently developed for testing stationarity in the Mexico/US real exchange rate, while allowing for an unknown number of structural breaks in the long-run level of the series. In our empirical implementation, inference relies on bootstraped critical values. As a result, we present unambiguous empirical evidence on the stationarity of the real exchange rate, thus favoring long-run purchasing power parity. En este artículo se describe la aplicación de métodos recientes para probar la estacionariedad del tipo de cambio real peso/dólar, tomando en cuenta la presencia de un número desconocido de cambios estructurales en el nivel de largo plazo de la serie. En nuestra implementación empírica, la inferencia se basa en valores críticos fundamentados en técnicas de remuestreo. Se presenta evidencia contundente sobre la estacionariedad del tipo de cambio real, apoyando así la hipótesis de la paridad del poder adquisitivo.

  12. Aprendizaje Cooperativo: Bases teóricas y hallazgos empíricos que explican su eficacia

    Directory of Open Access Journals (Sweden)

    Edurne Goikoetxea

    2002-01-01

    Full Text Available El aprendizaje cooperativo (AC es una de las formas de organizar la enseñanza con mayor respaldo teórico y empírico, y cada vez más empleada. Este trabajo revisa la teoría del contacto de Allport (1954/1962 para explicar por qué los métodos de AC tienen efectos positivos en las relaciones intergrupales e interétnicas. El modelo de Slavin (1984 se revisa para juzgar los elementos de una instrucción eficaz que logran ser satisfechos por el AC, dando lugar a efectos positivos en el rendimiento académico. Se describen, además, los nueve métodos de AC más investigados y se resumen los principales hallazgos sobre sus efectos, así como los mecanismos que explican dichos efectos, según los estudios de revisión y de meta-análisis

  13. Persistencia y capacidad predictiva de márgenes y rotaciones. un análisis empírico

    Directory of Open Access Journals (Sweden)

    Juan Monterrey

    2011-01-01

    Full Text Available En el presente trabajo abordamos el estudio empírico de la persistencia y capacidad predictiva de los componentes margen y rotación de la rentabilidad. A partir de una amplia muestra de compañías españolas, hemos documentado cómo la persistencia de la rotación es superior a la del margen, y cómo los componentes anormales de margen y rotación son menos persistentes que sus componentes sectoriales. Con relación a la capacidad predictiva, nuestros hallazgos confirman que el poder de predicción del margen es más elevado que el de la rotación, aunque su persistencia sea menor. Al separar los componentes sectorial y anormal de margen y rotación hemos comprobado cómo los componentes anormales muestran una capacidad predictiva superior a los componentes sectoriales. Los análisis complementarios muestran el distinto poder predictivo según el signo positivo o negativo de márgenes y rotaciones anormales, y según el signo del resultado, así como la robustez de nuestros hallazgos.

  14. Paternidade no Brasil: revisão sistemática de artigos empíricos

    Directory of Open Access Journals (Sweden)

    Mauro Luís Vieira

    2014-01-01

    Full Text Available El objetivo del estudio fue caracterizar la producción de artículos empíricos rela - cionados con el tema de la paternidad y su contribución al desarrollo del niño y de la familia, publicados entre 2000 y 2012 en revistas brasileñas indexadas en bases de datos IndexPsi, SciELO y PePSIC. Los descriptores usados fueron: “padre”, “paternidad” y “paternal”. Un centenar de artículos fueron analizados en su totalidad. En el 70% de ellos, los autores utilizaron el análisis cualitativo de los datos. Se observó la preferencia por el método de recolección de datos (60% y por la entrevista como técnica de recogida (47%. Entre los temas investigados se destacan: embarazo, parto y puerperio (25%, el ejercicio de la paternidad (22%, el desarrollo del niño (15%, la adolescencia (14% y concep - tos sobre el comportamiento paternal (13%. Estudios futuros deben investigar al padre en diferentes contextos y la división de papeles en la familia, la inte - gración de los enfoques cuantitativos y cualitativos y los estudios longitudinales.

  15. Elementos teóricos para el análisis empírico de la demanda

    Directory of Open Access Journals (Sweden)

    Gustavo López,

    2001-07-01

    Full Text Available El presente artículo constituye una síntesis de la teoría de la demanda y su única pretensión es la de establecer el nexo –poco usual entre nosotros- entre esa teoría y sus aplicaciones, para lo cual es necesario destacar algunos aspectos particulares. Después de un breve repaso a los elementos teóricos básicos se detallan algunas características que debe cumplir una función de demanda para que resulte adecuada a los requerimientos teóricos, así como algunas restricciones resultantes de la propia ecuación presupuestal y que impone límites a los valores de las elasticidades. Por último, se presentan algunos aspectos de la dualidad en la teoría de la demanda que son especialmente útiles en el manejo empírico.

  16. La PYME innovadora mexicana ante la crisis económica. Un estudio empírico

    Directory of Open Access Journals (Sweden)

    Edwin Estrella Pacheco

    2011-09-01

    Full Text Available Este trabajo estudia el crecimiento y el empleo de las empresas industriales manufactureras que son innovadoras del estado de Yucatán, en México, durante 2007-2009, periodo de la crisis financiera global. El incremento del desempleo es consecuencia del cierre de empresas, para recortar gastos. Se estudia el impacto de dicha crisis comparando el efecto en aquellas empresas que son innovadoras, con aquellas que no lo son. Se realiza un estudio empírico a 138 PYME, usando una entrevista dirigida a los gerentes, recolectando la información con un cuestionario, y analizándolo con técnicas multivariantes. Los resultados muestran que las PYME son en mayor medida poco innovadoras, que ambos tipos de empresas (innovadoras y no innovadoras en general conservaron el empleo, aunque las innovadoras mostraron mayor aumento en número de empleados que aquellas que son poco innovadoras. También se encontró que aquellas que son innovadoras tuvieron un mayor crecimiento que aquellas que son poco innovadoras. Referente al empleo, se encontró que aquellas que son innovadoras contrataron mayor número de trabajadores durante la crisis comparado con aquellas que son poco innovadoras. Se observó que las empresas innovadoras son en menor medida familiares, sus directivos cuentan con mayor formación universitaria, usan una estrategia agresiva (Exploradora-Analizadora y poseen mejor tecnología (Fuerte-Buena, contrastando con aquellas que son poco innovadoras.

  17. Responsabilidad Social Universitaria: estudio empírico sobre la fiabilidad de un conjunto de indicadores de Gobierno Corporativo

    Directory of Open Access Journals (Sweden)

    Montserrat Núñez Chicharro

    2015-10-01

    Full Text Available La Responsabilidad Social de la Universidad (RSU puede ser definida observando los impactos que provoca en el desarrollo de sus actividades. Partiendo de los grupos de impactos, podemos considerar un modelo de medición, identificando los aspectos de la RSU, con cuatro dimensiones: 1 organizacional, 2 educativa, 3 investigadora y 4 epistemológica y social. El objetivo del presente trabajo consiste en verificar la validez de un conjunto de indicadores propuestos de RSU, bajo el prisma de la dimensión organizacional. Los indicadores de medición de los impactos a nivel organizacional se definen partiendo de la clasificación por dimensiones propuesta por el Global Reporting Initiative, incorporando aquellos considerados específicos de la actividad universitaria. De las cuatro categorías identificadas en esta dimensión, analizaremos la del Gobierno Corporativo, ya que los indicadores del impacto económico, social y medioambiental están ampliamente contrastados por el mismo. La metodología utilizada es de naturaleza empírica y está basada en la interacción directa con un conjunto de expertos. Un requisito que la información contable externa debe cumplir es el de fiabilidad. En el estudio, se plantea inferir la validez de los indicadores propuestos, en relación con el citado requisito, mediante valoraciones particulares relativas a la Imparcialidad, Objetividad, Verificabilidad y Representación fiel.

  18. La demanda de trabajo: teoría y evidencia empírica para el caso colombiano

    Directory of Open Access Journals (Sweden)

    Jairo Guillermo Isaza Castro

    2004-07-01

    Full Text Available Este documento presenta algunos de los aspectos teóricos más importantes para el análisis de la demanda de trabajo, así como la evidencia empírica disponible para el caso colombiano. En cuanto a los aspectos teóricos, la exposición se centra en la discusión microeonómica concerniente a las propiedades de la demanda de trabajo del empresario maximizador debeneficios que enfrenta un proceso productivo con dos factores: capital y trabajo. Luego se discuten las implicaciones de los procesos de liberalización y reformas estructurales en la demanda de trabajo. La revisión de literatura efectuada para el caso colombiano muestra cómo, en general, los estimativos de elasticidades de la demanda por trabajadores frente al producto y el salario real difieren sustancialmente debido a la diversidad de especificaciones econométricas, la temporalidad de los datos y las fuentes de los mismos.

  19. Resiliencia en Enfermería: definición, evidencia empírica e intervenciones

    Directory of Open Access Journals (Sweden)

    Óscar Arrogante

    2015-12-01

    Full Text Available La resiliencia (adaptación positiva a la adversidad se encuentra dentro de las competencias enfermeras al relacionarse con tres diagnósticos de la taxonomía NANDA y, además, la investigación enfermera señala que es una característica propia de la Enfermería. Sin embargo, la resiliencia es un concepto novedoso para la mayoría de las enfermeras. El artículo tiene como objetivos definir el concepto de resiliencia, exponer la evidencia empírica encontrada en la investigación enfermera y describir los principales programas e intervenciones para su desarrollo. La resiliencia tiene importantes implicaciones clínicas tanto para el cuidado de pacientes, como para el propio autocuidado de la Enfermería. La resiliencia se puede considerar como una característica esencial e inherente a la Enfermería debido a la exposición continua al sufrimiento humano y a unas condiciones laborales estresantes. Por lo tanto, su entrenamiento debería promoverse desde las universidades hasta los centros sanitarios para mejorar la práctica clínica enfermera.

  20. El carácter empírico y lógico de la contabilidad

    Directory of Open Access Journals (Sweden)

    Eduardo R. Scarano

    2009-12-01

    Full Text Available El objetivo de este artículo es argumentar acerca del carácter esencialmente empírico y científico de la contabilidad. Este punto de vista implica rechazar el carácter predominantemente normativo que posee la contabilidad, por lo menos, en Latinoamérica. Se considera que el normativismo de cualquier tipo es meramente secundario.La contabilidad es una disciplina científica, pero al carecer de leyes estrictas no constituye una ciencia básica, es una tecnología social.Se mostrará que tiene una estructura axiomática específica que se puede exponer con la lógica estándar, lo mismo que la matemática contable que supone la partida doble.The aim of this article is to argue about the essentially empirical and scientific character of the accounting. This point of view implies rejecting the predominantly normative character that possesses the accounting, at least, in Latin America. It thinks that the normativism of any type is merely secondary.The accounting is a scientific discipline, but it lacks strict laws, therefore, it does not constitute a basic science, is a social technology.It will appear that it has an axiomatic specific structure that can be exposed by the standard logic the same as the accounting mathematics that supposes the double entry.

  1. Inadimplência no Brasil: Uma Análise das Evidências Empíricas

    Directory of Open Access Journals (Sweden)

    Mariane Daros

    2017-08-01

    Full Text Available O objetivo deste trabalho consiste em analisar as evidências empíricas de estudos relacionados à inadimplência dentro do contexto brasileiro, verificando os estudos desses aspectos nas diversas regiões do país. Além disso, foram analisadas questões relacionadas ao panorama desses estudos a fim de verificar em quais pontos os trabalhos futuros desse tema podem vir a avançar. A partir da análise dos estudos publicados dentro da temática nota-se a existência de alguns pontos que não são aprofundados e que podem avançar por meio de estudos futuros. Dentre esses pontos estão: exploração do tema em todos os setores da economia, maior variação na utilização de procedimentos metodológicos, utilização de série temporal para verificar a evolução do fenômeno e associar a inadimplência com outras temáticas correlatas a essa questão como o endividamento, alfabetização financeira, consumismo, motivações pessoais do indivíduo, aspectos socioeconômicos e causas que podem ter ligação no produto e serviço disponibilizado ao consumidor.

  2. Los conceptos innatos en la obra de Chomsky: definición y propuesta de un método empírico para su estudio

    Directory of Open Access Journals (Sweden)

    Oliver Müller

    2013-06-01

    Full Text Available Este artículo versa sobre los conceptos innatos: su definición, de acuerdo a la obra lingüística de Noam Chomsky, y el esbozo de un método que permita su estudio. A manera de introducción se refieren algunas concepciones académicas sobre la adquisición conceptual y se comenta la falta de un método de estudio empírico de los conceptos nativos. Enseguida, se presenta la definición que a lo largo del tiempo ha defendido Chomsky sobre dichos conceptos. Finalmente, se instauran de manera teórica las condiciones de un procedimiento empírico para el estudio de los conceptos innatos, titulado análisis semántico de corpus.

  3. Structural Studies on Plasmodium falciparum Erythrocyte Membrane Protein 1 (PfEMP1) Malaria Antigens Using Small Angle X-Ray Scattering (SAXS)

    DEFF Research Database (Denmark)

    Christoffersen, Stig

    Chemistry (App I) [1]. VAR2CSA binds specifically to CSA in the placental tissue of pregnant women hereby causing severe malaria symptoms endangering both mother and child. The minimal VAR2CSA region required to effectively bind CSA was determined to be the N-terminal DBL domain, DBL2X which we locate......Infection with the pathogenic Plasmodium falciparum parasite causes the potentially deadly Malaria disease which leads to over 1 million fatalities each year according to the WHO (World Health Organization). Individuals subjected to multiple infections gradually become immune to the disease...... symptoms and vaccine research is focused on trying to mimic or advance this immune acquisition. Immunity is primarily caused by acquisition of antibodies directed against a family of Plasmodium protein antigens called PfEMP1s located on the surface of infected erythrocytes. The PfEMP1 proteins are adhesive...

  4. Implicaciones teóricas y empíricas de la nueva definición de desempleo en Colombia.

    Directory of Open Access Journals (Sweden)

    Juan Carlos Guataqui

    2010-05-01

    Full Text Available En junio de 2000 Colombia adoptó una nueva definición de desempleo siguiendo los estándares de la OIT. Este cambio implicó una reducción de la tasa de desempleo del orden de dos puntos porcentuales. En este documento contrastamos el caso Colombiano con las experiencias de otros países en términos de la transformación metodológica y sus implicaciones empíricas. Posteriormente, evaluamos el soporte empírico del cambio de metodología. Nuestros resultados sugieren implicaciones específicas sobre el desempleo estructural y su relación con el perfil educativo de los desempleados; por lo tanto, cuestionan la aplicación práctica de la definición estándar de desempleo de la OIT al caso colombiano.

  5. Structural Conservation Despite Huge Sequence Diversity Allows EPCR Binding by the PfEMP1 Family Implicated in Severe Childhood Malaria

    DEFF Research Database (Denmark)

    Lau, Clinton K.Y.; Turner, Louise; Jespersen, Jakob S.

    2015-01-01

    with severe childhood malaria. We combine crystal structures of CIDRa1:EPCR complexes with analysis of 885 CIDRa1 sequences, showing that the EPCR-binding surfaces of CIDRa1 domains are conserved in shape and bonding potential, despite dramatic sequence diversity. Additionally, these domains mimic features...... of the natural EPCR ligand and can block this ligand interaction. Using peptides corresponding to the EPCR-binding region, antibodies can be purified from individuals in malaria-endemic regions that block EPCR binding of diverse CIDRa1 variants. This highlights the extent to which such a surface protein family......The PfEMP1 family of surface proteins is central for Plasmodium falciparum virulence and must retain the ability to bind to host receptors while also diversifying to aid immune evasion. The interaction between CIDRa1 domains of PfEMP1 and endothelial protein C receptor (EPCR) is associated...

  6. Overproduction, purification and crystallization of a chondroitin sulfate A-binding DBL domain from a Plasmodium falciparum var2csa-encoded PfEMP1 protein

    International Nuclear Information System (INIS)

    Higgins, Matthew K.

    2008-01-01

    A chondroitin sulfate A-binding DBL important in placental malaria has been overproduced, purified and crystallized. Diffraction data were collected to 1.9 Å resolution. The PfEMP1 proteins of the malaria parasite Plasmodium falciparum are inserted into the membrane of infected red blood cells, where they mediate adhesion to a variety of human receptors. The DBL domains of the var2csa-encoded PfEMP1 protein play a critical role in malaria of pregnancy, tethering infected cells to the surface of the placenta through interactions with the glycosaminoglycan carbohydrate chondroitin sulfate A (CSA). A CSA-binding DBL domain has been overproduced in a bacterial expression system, purified and crystallized. Native data sets extending to 1.9 Å resolution have been collected and phasing is under way

  7. La tasa de crecimiento garantizada de Harrod como ley del crecimiento económico. Una comprobación empírica

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    Bernal Bellón José Reyes Reyes

    2008-12-01

    Full Text Available En teoría del crecimiento hubo desarrollos importantes en la década de los 50 a partir del modelo de crecimiento poskeynesiano de Harrod (1939, los cuales buscaban solucionar teóricamente el problema de inestabilidad que presentaba este modelo. No obstante, no se ha realizado una comprobación empírica literal del modelo. En el presente trabajo se modifica el modelo de Harrod incluyendo el cambio técnico y se realiza una comprobación
    empírica a través de diferentes metodologías. Se concluye que la tasa de crecimiento garantizada de Harrod tiende a ser una ley en teoría del crecimiento económico.

  8. Overproduction, purification and crystallization of a chondroitin sulfate A-binding DBL domain from a Plasmodium falciparum var2csa-encoded PfEMP1 protein

    Energy Technology Data Exchange (ETDEWEB)

    Higgins, Matthew K., E-mail: mkh20@cam.ac.uk [Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (United Kingdom)

    2008-03-01

    A chondroitin sulfate A-binding DBL important in placental malaria has been overproduced, purified and crystallized. Diffraction data were collected to 1.9 Å resolution. The PfEMP1 proteins of the malaria parasite Plasmodium falciparum are inserted into the membrane of infected red blood cells, where they mediate adhesion to a variety of human receptors. The DBL domains of the var2csa-encoded PfEMP1 protein play a critical role in malaria of pregnancy, tethering infected cells to the surface of the placenta through interactions with the glycosaminoglycan carbohydrate chondroitin sulfate A (CSA). A CSA-binding DBL domain has been overproduced in a bacterial expression system, purified and crystallized. Native data sets extending to 1.9 Å resolution have been collected and phasing is under way.

  9. Contramedidas em segurança da informação e vulnerabilidade cibernética: evidência empírica de empresas brasileiras

    OpenAIRE

    Cortez, Igor Siqueira; Kubota, Luis Claudio

    2013-01-01

    Recentemente, uma série de ataques cibernéticos a empresas e governos no Brasil e no exterior tornou público o potencial impacto econômico desse tipo de atividade, do ponto de vista tanto privado quanto público. Existe extensa literatura econômica - teórica e empírica - que avalia os incentivos para que as empresas adotem ou não medidas de segurança da informação. No presente estudo foi desenvolvida uma avaliação empírica desse fenômeno no Brasil. Modelos logit e probit ordenado foram desenvo...

  10. Physiological parameters

    International Nuclear Information System (INIS)

    Natera, E.S.

    1998-01-01

    The physiological characteristics of man depend on the intake, metabolism and excretion of stable elements from food, water, and air. The physiological behavior of natural radionuclides and radionuclides from nuclear weapons testing and from the utilization of nuclear energy is believed to follow the pattern of stable elements. Hence information on the normal physiological processes occurring in the human body plays an important role in the assessment of the radiation dose received by man. Two important physiological parameters needed for internal dose determination are the pulmonary function and the water balance. In the Coordinated Research Programme on the characterization of Asian population, five participants submitted data on these physiological characteristics - China, India, Japan, Philippines and Viet Nam. During the CRP, data on other pertinent characteristics such as physical and dietary were simultaneously being collected. Hence, the information on the physiological characteristics alone, coming from the five participants were not complete and are probably not sufficient to establish standard values for the Reference Asian Man. Nonetheless, the data collected is a valuable contribution to this research programme

  11. Migrações internas: evolução teórica e algumas evidências empíricas para o caso brasileiro

    OpenAIRE

    Márcia Regina Gabardo Câmara

    1988-01-01

    The aim of this article is to show new light concerning internal migration in Brazil. Consequently a review of the specialized literature was necessary and here in are presented some empirical evidences concerning its recent development. O objetivo do presente artigo é jogar novas luzes sobre a migração interna no Brasil. Conseqüentemente, foi necessário revisar a literatura especializada e apresentar algumas evidências empíricas sobre o seu desenvolvimento recente

  12. A semi-automated multiplex high-throughput assay for measuring IgG antibodies against Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) domains in small volumes of plasma

    DEFF Research Database (Denmark)

    Cham, Gerald K K; Kurtis, Jonathan; Lusingu, John

    2008-01-01

    -based assay was sensitive, accurate and reproducible. Four recombinant PfEMP1 proteins C17, D5, D9 and D12, selected on the basis that they showed a spread of median fluorescent intensity (MFI) values from low to high when analysed by the bead-based assay were analysed by ELISA and the results from both...... reactivity levels to twenty eight different recombinant PfEMP1 proteins were simultaneously measured using a single microliter of plasma. Thus, the assay reported here provides a useful tool for rapid and efficient quantification of antibody reactivity against PfEMP1 variants in human plasma....... of twenty nine PfEMP1 domains were PCR amplified from 3D7 genomic DNA, expressed in the Baculovirus system and purified by metal-affinity chromatography. The antibody reactivity level to the recombinant PfEMP1 proteins in human hyper-immune plasma was measured by ELISA. In parallel, these recombinant PfEMP1...

  13. Análise empírico-mecanística do efeito do excesso de carga veículos comerciais. (DOI.: 10.5216/reec.v9i2.29489

    Directory of Open Access Journals (Sweden)

    Thaís Ferrari Réus

    2014-10-01

    Full Text Available RESUMO: O dimensionamento dos pavimentos flexíveis vem sendo realizado por meio de métodos empíricos, desenvolvidos na década de 60 e em condições específicas, portanto o seu uso de forma inadequada pode gerar resultados errôneos quando se tratam de situações em que os parâmetros locais de projeto, da região onde se pretende executar o pavimento, não sejam similares às utilizadas na determinação do método. Atualmente há uma tendência de substituição desses métodos pelos empíricos mecanicistas, que permitem avaliar de maneira mais coerente e analítica o comportamento estrutural do pavimento. O objetivo deste trabalho é verificar, de acordo com os tipos de veículos comerciais circulantes no Lote 1 do Anel de Integração do Paraná, a adequação das cargas de tráfego às regulamentações referentes ao limite de peso, bem como a quantificação do efeito danoso proveniente de tal carregamento. Para tanto, foram realizadas simulações no programa ELSYM5 (versão 1.0 desenvolvido na Universidade de Berkeley (1985, para a determinação das deformações estruturais do pavimento e posterior cálculo do Fator de Equivalência de Carga (FEC empírico-mecanístico. Na análise foram utilizados dados de pesagem obtidos nos anos de 2008 e 2009 nos postos de pesagem localizados nas rodovias BR-153 e BR-369, bem como as cargas máximas permitidas por eixo, sem considerar a tolerância. A partir da análise dos resultados concluiu-se que o panorama de carregamento das rodovias é preocupante, afetando o desempenho do pavimento e gerando a necessidade de intervenção, para a recuperação deste, em tempo menor do que o previsto em projeto. ABSTRACT: The design of flexible pavements has been done through empirical methods, developed in the 60s and under specific conditions, therefore its use improperly may produce erroneous results when dealing with situations in which local design parameters where the pavement will be constructed

  14. Un estudio empírico sobre el consumo cultural y la toma de decisiones egoístas

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    Tomás Bonavía

    2018-01-01

    Full Text Available El objetivo principal que persigue el presente trabajo es mostrar empíricamente en un nuevo contexto, que el mecanismo que rige el proceso de toma de decisiones a la hora de optar por consumir bienes culturales no se ajusta enteramente a la visión racional y egoísta del ser humano propuesta por la economía clásica. Para alcanzar este objetivo se planteó un diseño experimental con tres grupos (dos experimental y uno control a los que se les daba la opción de elegir hipotéticamente entre reclamar la devolución del dinero de la entrada a la salida de diferentes eventos culturales (decisión egoísta o no hacerlo (decisión no egoísta. Para analizar los resultados se realizó una prueba binomial para determinar si la diferencia de proporciones entre las respuestas afirmativas y negativas eran o no significativas. Los resultados obtenidos indican que en la mayoría de las situaciones los participantes se negaban a reclamar la devolución del dinero de la entrada a la salida del evento cultural, actuando así de manera no-racional bajo la visión económica clásica. Estos resultados tendrían, a efectos prácticos, un aumento en el número de espectadores que asisten a actos culturales.

  15. Criminologia e Prisão: caminhos e desafios da pesquisa empírica no campo prisional

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    Ana Gabriela Mendes Braga

    2014-01-01

    Full Text Available O presente artigo é um dos frutos da pesquisa de doutoramento “Reintegração social: discursos e práticas na prisão ‒ um estudo comparado”, na qual foram analisados alguns projetos desenvolvidos por entidades da sociedade civil em estabelecimentos prisionais de São Paulo e da Catalunha (Espanha. Para tanto, utilizou-se metodologia qualitativa de pesquisa, com o emprego de três métodos: entrevistas semidirigidas com os envolvidos direta e indiretamente com os projetos (voluntários, presos, diretores de entidades, funcionários da prisão; pesquisa documental (projetos, memoriais, manuais; e, relatos etnográficos produzidos a partir da observação in loco do trabalho desenvolvido pelas entidades selecionadas nos estabelecimentos prisionais. Neste paper, ganha destaque a questão do método em criminologia e as reflexões acerca da pesquisa empírica na prisão. Em uma pesquisa situada em um espaço tão hermético como a prisão, explicitar os caminhos de inserção do campo é um exercício que desvela os mecanismos de poder em funcionamento, e acaba por levar o pesquisador de volta ao objeto da própria tese. Afinal, muitos dos empecilhos e barreiras criadas para a entrada do pesquisador na prisão são os mesmos com que se deparam as entidades e pessoas da sociedade civil. Esse artigo é uma reflexão acerca dos caminhos e dos desafios vivenciados por aqueles que adentram o espaço prisional enfrentando o isolamento impostos por seus muros.

  16. Determinantes multidimensionales en la calidad percibida del empleo. Evidencia empírica para España

    Directory of Open Access Journals (Sweden)

    Díaz-Chao, Ángel

    2015-04-01

    Full Text Available Through a representative sample of 8.755 employees in 2010, and using a structural equations model (SEM, this article analyzes empirically the multidimensional determinants (direct effects of the perceived work quality in Spain. The research concludes that the perceived work quality combines a broad set of explanatory dimensions that are linked with de workplace itself (intrinsic work quality, organization, access and inclusion, and compensations, but also with their environment and labor relations (social relations, work intensity, skills and training, and health and safety. Therefore, the public employment policies for ending the economic crisis should not only address the quality or workplace, but also meet the dimensions related to their environment and labor relations.A través de una muestra representativa para 8.755 empleados asalariados en 2010, y utilizando un sistema de ecuaciones estructurales, este artículo analiza empíricamente los determinantes multidimensionales (efectos directos de la calidad percibida del empleo en España. La investigación concluye que la calidad del empleo combina un amplio conjunto de dimensiones explicativas que están vinculadas con el propio puesto de trabajo (calidad intrínseca, organización, inclusión y acceso y compensación, pero también con su entorno y las relaciones laborales (relaciones sociales, intensidad del empleo, formación, y salud y seguridad en el trabajo. Por consiguiente, las políticas públicas de empleo para la salida de la crisis no solo deberían abordar la calidad del puesto de trabajo, sino también atender a las dimensiones vinculadas con su entorno y las relaciones laborales.

  17. SOLAR ERUPTION AND LOCAL MAGNETIC PARAMETERS

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jeongwoo; Chae, Jongchul [Department of Physics and Astronomy, Seoul National University, Seoul 08826 (Korea, Republic of); Liu, Chang; Jing, Ju [Space Weather Research Laboratory, New Jersey Institute of Technology, Newark, NJ 07102 (United States)

    2016-11-10

    It is now a common practice to use local magnetic parameters such as magnetic decay index for explaining solar eruptions from active regions, but there can be an alternative view that the global properties of the source region should be counted as a more important factor. We discuss this issue based on Solar Dynamics Observatory observations of the three successive eruptions within 1.5 hr from the NOAA active region 11444 and the magnetic parameters calculated using the nonlinear force-free field model. Two violent eruptions occurred in the regions with relatively high magnetic twist number (0.5–1.5) and high decay index (0.9–1.1) at the nominal height of the filament (12″) and otherwise a mild eruption occurred, which supports the local-parameter paradigm. Our main point is that the time sequence of the eruptions did not go with these parameters. It is argued that an additional factor, in the form of stabilizing force, should operate to determine the onset of the first eruption and temporal behaviors of subsequent eruptions. As supporting evidence, we report that the heating and fast plasma flow continuing for a timescale of an hour was the direct cause for the first eruption and that the unidirectional propagation of the disturbance determined the timing of subsequent eruptions. Both of these factors are associated with the overall magnetic structure rather than local magnetic properties of the active region.

  18. Análisis empírico de la financiación de nuevas empresas en Colombia

    Directory of Open Access Journals (Sweden)

    Bernardo Barona-Zuluaga

    2012-03-01

    Full Text Available Este artículo identifica y analiza los patrones de financiación de las empresas nuevas en Colombia. Como marco de referencia se toma la moderna teoría financiera que incorpora los conceptos de asimetría de información y de la economía institucional en el estudio de la estructura financiera y de capital empresariales. En especial, se emplea el concepto desarrollado por Berger y Udell (1998 de que el ciclo de vida en que se encuentra una empresa particular afecta su estructura de capital óptima, y se someten a prueba varias hipótesis respecto a la forma en que se financian las empresas jóvenes colombianas. Para la contrastación empírica de las hipótesis se utiliza una base de datos provista (a solicitud de los investigadores por la Superintendencia de Sociedades de Colombia, de empresas creadas entre los años 1999 y 2007; la muestra depurada quedó conformada por 4.034 empresas, 922 con edad inferior a cinco años (infantes–adolecentes, I&A y 3.112 con existencia mayor a cinco años (mediana edad, EM. Los análisis univariado y multivariado realizados, tomados de manera conjunta, indican que la etapa en el ciclo de vida de una empresa importa en la definición de su estructura de capital: no solo la importancia de las fuentes específicas de financiación es diferente en las dos categorías etarias, sino también algunos de los factores que se relacionan de manera significativa con su estructura financiera. El patrimonio se revela como la fuente de financiación más importante en ambos tipos de categorías; la inversión de los dueños es la partida patrimonial más importante en las I&A, en tanto que las utilidades retenidas lo son en las EM. Tanto el tamaño como la tangibilidad de los activos están relacionados de manera positiva con el porcentaje de apalancamiento de las empresas de los dos grupos estudiados. La rentabilidad se relaciona de manera negativa y significativa con el apalancamiento de las EM. Estos hallazgos tienen

  19. Persistencia y capacidad predictiva de márgenes y rotaciones. Un análisis empírico.

    Directory of Open Access Journals (Sweden)

    Juan Monterrey

    2011-06-01

    Full Text Available ABSTRACTThis paper presents an empirical analysis of the persistence and predictive ability of the components the profitability ratio, namely, margin and turnover. Based on a large sample of Spanish companies, we document that the persistence of turnover is greater than that of profit margin and that abnormal components of both, turnover and margin have a lower degree of persistence when compared to industry components. As for predictive ability, our findings confirm that albeit having a lower persistence, margin has a greater predictive power than turnover. By decomposing margin and turnover into their industry and abnormal components, we confirm that abnormal items have a greater predictive ability than industry components. Additional tests revealed that our findings are robust, although the predictive power of our variables changes depending on their sign as well as in the presence of positive and negative earnings.RESUMENEn el presente trabajo abordamos el estudio empírico de la persistencia y capacidad predictiva de los componentes margen y rotación de la rentabilidad. A partir de una amplia muestra de compañías españolas, hemos documentado cómo la persistencia de la rotación es superior a la del margen, y cómo los componentes anormales de margen y rotación son menos persistentes que sus componentes sectoriales. Con relación a la capacidad predictiva, nuestros hallazgos confirman que el poder de predicción del margen es más elevado que el de la rotación, aunque su persistencia sea menor. Al separar los componentes sectorial y anormal de margen y rotación hemos comprobado cómo los componentes anormales muestran una capacidad predictiva superior a los componentes sectoriales. Los análisis complementarios muestran el distinto poder predictivo según el signo positivo o negativo de márgenes y rotaciones anormales, y según el signo del resultado, así como la robustez de nuestros hallazgos.

  20. Evicencia Empírica en Torno al Estudio del Factor Tamaño cono Condicionante Empresarial

    Directory of Open Access Journals (Sweden)

    María Elena Gómez Miranda

    2004-06-01

    Full Text Available En este trabajo presentamos las principales conclusiones obtenidas a través de la realización de un estudio empírico, con el que contrastamos la hipótesis del condicionamiento empresarial por razón de su dimensión. La investigación se ha realizado a través de la aplicación de diversas técnicas de análisis multivariable, concretamente el análisis factorial, cluster y discriminante, sobre la información relativa a una muestra integrada por 6.600 empresas. Para la definición del tamaño empresarial se han tomado como referencia diversos criterios, los cuales están basados en los utilizados por algunas Centrales de Balances españolas para la clasificación y explotación de sus bases de datos. La interpretación de los resultados obtenidos nos permite concluir que las características económico-financieras de las empresas que integran nuestra muestra son independientes de su dimensión, incumpliéndose por tanto la hipótesis del condicionamiento empresarial por razón de su tamaño. In this paper we point out the main conclusions obtained through an empirical study carried out in order to check the hypothesis with regard to firm conditioning in view of its size. The research has been carried out by applying diverse techniques of multivariable analysis, specifically factorial analysis, cluster and discriminant, on the basis of the information available from a sample made up by 6.600 firms. Diverse criteria used by certain Spanish Commercial Performance Information Bureaus to classify and work with their database, have been taken as a reference in the outline of a firms size. According to the analysis of the results obtained, we conclude that the economic and financial characteristics of the firms examined do not depend on their size, and therefore the hypothesis of firm nature according to its size is not confirmed.

  1. Evaluación de la orientación empática en estudiantes de medicina de la Universidad del Norte. Barranquilla (Colombia

    Directory of Open Access Journals (Sweden)

    Luz Marina Alonso Palacio

    2013-01-01

    Full Text Available Objetivo: Determinar el nivel de orientación empática de los estudiantes de medicina de la Universidad del Norte. Materiales y Métodos: Investigación de tipo descriptiva transversal. La población es - taba constituida por 859 estudiantes, de la cual se tomó una muestra de 345 estudiantes voluntarios (niveles: 1°, 2°, 3°, 4° y 5° año, (1°. n = 128, 2º. n = 102, 3°. n = 38, 4°. n = 41, y 5°. n = 36. Se aplicó, en 2012, la versión en español de la Escala de Empatía Médica de Jefferson ( EEMJ para estudiantes de medicina (versión S, validada en México y Chile y adaptada culturalmente a Colombia mediante el método de validación por criterio de jueces, se calculó: promedio, desviación y se aplicó análisis de varianza bifactorial para diferencia de medias y evaluar interacción entre las variables estudiadas. Resultados: La orientación empática presentó valores ubicados por encima del valor cen - tral del rango de la escala que oscila entre 20 y 140. No se encontraron diferencias signi - ficativas por género ni por año en las puntuaciones. Conclusiones: Los promedios de orientación empática presentaron tendencia casi cons - tante con fluctuaciones no significativas. Sería de gran valor investigar otras variables que pueden afectar la empatía.

  2. Facilitadores institucionales y sociales para la gobernanza local de los riesgos medioambientales. Análisis empírico con municipios chilenos

    Directory of Open Access Journals (Sweden)

    Patricio Valdivieso

    Full Text Available Resumen El contexto latinoamericano de exposición a riesgos medioambientales demanda un mayor entendimiento de los factores institucionales que tienen impacto en la gestión medioambiental local. Con el apoyo de métodos mixtos de investigación, este estudio examina hipótesis sobre relaciones entre factores políticos, institucionales, sociales y la gestión medioambiental municipal, en el contexto empírico de municipalidades chilenas. Los resultados sugieren que la combinación de factores políticos, arreglos y capacidades institucionales, y relaciones con la sociedad explican diferentes comportamientos municipales.

  3. Insect cells are superior to Escherichia coli in producing malaria proteins inducing IgG targeting PfEMP1 on infected erythrocytes

    DEFF Research Database (Denmark)

    Victor, Michala E; Bengtsson, Anja; Andersen, Gorm

    2010-01-01

    -exposed epitopes are unknown. An insect cell and Escherichia coli based system was used to express single and double domains encoded by the pfd1235w var gene. The resulting recombinant proteins have been evaluated for yield and purity and their ability to induce rat antibodies, which react with the native PFD1235w...... PfEMP1 antigen expressed on 3D7PFD1235w-IE. Their recognition by human anti-malaria antibodies from previously infected Tanzanian donors was also analysed....

  4. Fatores de impacto na Atitude e na Intenção de uso do M-learning: um teste empírico

    OpenAIRE

    Kurtz, Renata; Macedo-Soares, T. Diana de; Ferreira, Jorge Brantes; Freitas, Angilberto Sabino de; Silva, Jorge Ferreira da

    2015-01-01

    Este artigo apresenta os resultados de uma pesquisa empírica em que se propõe um modelo para avaliar a atitude e a intenção de uso do mobile-learning(m-learning) por estudantes do ensino superior de um curso de administração baseado na teoria do flow, no Modelo de Aceitação de Tecnologia e na Teoria do Comportamento Planejado. A partir deste arcabouço teórico elaborou-se uma atividade prática envolvendo o uso de dispositivos com tecnologia móvel digital (celulares) em que se buscou aplicar o ...

  5. Revisi?n de literatura emp?rica acerca de la relaci?n entre depresi?n y apoyo familiar en personas transg?nero

    OpenAIRE

    Ruiz Cortes, Estefany Tatiana

    2017-01-01

    Se realiz? una revisi?n de diferentes trabajos e investigaci?n emp?rica sobre sobre el concepto de g?nero e identidad de g?nero y la conceptualizaci?n del transgenerismo como fen?meno buscando una aproximaci?n de los factores que intervienen en el proceso de socializaci?n y desarrollo psicosocial de las personas transg?nero. La constante discriminaci?n, estigmatizaci?n y segregaci?n social hacen que las personas trans sean vulnerables y que lleguen a presentar niveles de ansiedad, depresi?n y...

  6. La restricción intertemporal del presupuesto. Una evaluación empírica para el Gobierno Nacional Central de Colombia, 1950-2010

    Directory of Open Access Journals (Sweden)

    Hernando Chaves Álvaro

    2003-12-01

    Full Text Available En este documento se analiza la sostenibilidad fiscal del Gobierno Nacional Central en Colombia utilizando el enfoque de la Restricción Intertemporal de Presupuesto. Los resultados empíricos revelan que la estrategia fiscal actual es sostenible. No obstante, se vislumbran problemas de insolvencia en el largo plazo, lo que implica generar un mayor superávit primario en comparación con el actualmente programado. Lo anterior, se sustenta en los valores estimados de los indicadores de sostenibilidad fiscal.

  7. El conductismo en la ciencia política: descifrando un concepto poco maleable en los horizontes de la investigación empírica

    OpenAIRE

    John Fredy Bedoya Marulanda

    2015-01-01

    Este artículo tiene como objetivo revivir el conductismo como una forma derealizar investigación empírica en la ciencia política, haciendo el llamado a lacientificidad de la disciplina con un objeto de estudio específico: elcomportamiento político de los individuos. Desde allí se presenta como sepuede definir el conductismo, sus cánones metodológicos y una aproximación acómo debe entenderse el comportamiento político.

  8. Responsabilidad Social Corporativa de la Empresas de Distribución Comercial Españolas. Evidencias Empíricas

    OpenAIRE

    Díaz Heredia, Isabel

    2013-01-01

    En este Trabajo Fin de Máster se analiza la Responsabilidad Social Corporativa de las grandes empresas de distribución comercial en España. En él se trata el desarrollo teórico de la RSC, el sector de la distribución comercial y, por último, se realiza un estudio empírico para el análisis del grado de RSC on-line en las grandes empresas de distribución comercial.

  9. Preconcepciones de ciencia y tecnología en los profesores de bachillerato: un estudio empírico en el estado de Guanajuato

    OpenAIRE

    Rebollo León, Jorge Luis

    2008-01-01

    En este artículo se presenta un estudio empírico con profesores que enseñan ciencias naturales a nivel Bachillerato. Actualmente muchos profesores mantienen una imagen deformada de lo que es la ciencia y la tecnología. Algunos la conciben como un conocimiento acabado e infalible, otros como una actividad a-histórica y a-problemática o bien hay quienes la conciben como un quehacer elitista y descontextualizado. El propósito de este estudio es conocer cuáles son las preconcepciones sobre la...

  10. Plasmodium falciparum associated with severe childhood malaria preferentially expresses PfEMP1 encoded by group A var genes

    DEFF Research Database (Denmark)

    Jensen, Anja T R; Magistrado, Pamela; Sharp, Sarah

    2004-01-01

    Parasite-encoded variant surface antigens (VSAs) like the var gene-encoded Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) family are responsible for antigenic variation and infected red blood cell (RBC) cytoadhesion in P. falciparum malaria. Parasites causing severe malaria in noni...... genes, such as PFD1235w/MAL7P1.1, appear to be involved in the pathogenesis of severe disease and are thus attractive candidates for a vaccine against life-threatening P. falciparum malaria....

  11. Migrações internas: evolução teórica e algumas evidências empíricas para o caso brasileiro

    Directory of Open Access Journals (Sweden)

    Márcia Regina Gabardo Câmara

    1988-08-01

    Full Text Available The aim of this article is to show new light concerning internal migration in Brazil. Consequently a review of the specialized literature was necessary and here in are presented some empirical evidences concerning its recent development. O objetivo do presente artigo é jogar novas luzes sobre a migração interna no Brasil. Conseqüentemente, foi necessário revisar a literatura especializada e apresentar algumas evidências empíricas sobre o seu desenvolvimento recente

  12. Un análisis empírico de las no linealidades en la movilidad intergeneracional del ingreso. El caso de la Argentina

    OpenAIRE

    Jiménez, Maribel

    2017-01-01

    El principal objetivo de este estudio es cuantificar y examinar la movilidad intergeneracional del ingreso en la Argentina, explorando la hipótesis de variación del grado de (in)movilidad a lo largo de la distribución del ingreso correspondiente a los hijos así como a los padres, a través de la aplicación de métodos econométricos utilizados en la literatura empírica reciente para datos no longitudinales. Los resultados, obtenidos a partir de la información proveniente de dos muestras de la En...

  13. Un análisis empírico de las no linealidades en la movilidad intergeneracional del ingreso : El caso de la Argentina

    OpenAIRE

    Jiménez, Maribel

    2010-01-01

    El principal objetivo de este estudio es cuantificar y examinar la movilidad intergeneracional del ingreso en la Argentina, explorando la hipótesis de variación del grado de (in)movilidad a lo largo de la distribución del ingreso correspondiente a los hijos así como a los padres, a través de la aplicación de métodos econométricos utilizados en la literatura empírica reciente para datos no longitudinales. Los resultados, obtenidos a partir de la información proveniente de dos muestras de la En...

  14. [Soil particle size distribution and its fractal dimension among degradation sequences of the alpine meadow in the source region of the Yangtze and Yellow River, Qinghai-Tibetan Plateau, China].

    Science.gov (United States)

    Wei, Mao-Hong; Lin, Hui-Long

    2014-03-01

    The alpine meadow in the source region of the Yangtze and Yellow River is suffering serious deterioration. Though great efforts have been put into, the restoration for the degraded grassland is far from being effective, mainly due to poor understanding of the degradation mechanism of alpine meadow in this region. In order to clarify the formation mechanism of degradation grassland and provide the new ideas for restoration, degradation sequences of the alpine meadow in the source region of the Yangtze and Yellow River were taken as target systems to analyze the soil particle size distribution, the fractal dimension of the soil particle size, and the relationship between soil erosion modulus and fractal dimension. The results showed that, with increasing grassland degradation, the percentage contents of clay increased while the percentage contents of silt sand and very fine sand showed a decreasing trend. The fractal dimension presented a positive correlation with clay among the degradation sequences while negative correlations were found with very fine sand and silt sand. The curvilinear regression of fractal dimension and erosion modulus fitted a quadratic function. Judged by the function, fractal dimension 2.81 was the threshold value of soil erosion. The threshold value has an indicative meaning on predicting the breakout of grazing-induced erosion and on restoration of the degraded grassland. Taking fractal dimension of 2.81 as the restoration indicator, adoption of corresponding measures to make fractal dimension less than 2.81, would an effective way to restore the degradation grassland.

  15. La fuerza de los lazos: una exploración teórica y empírica de sus múltiples significados

    Directory of Open Access Journals (Sweden)

    Irene Cruz Gómez

    2013-01-01

    Full Text Available La fuerza del vínculo es una de las características recurrentemente estudiadas en las redes personales. Es un dato aparentemente sencillo de generar, con una potencial capacidad predictiva sobre los intercambios dentro de la relación y de la posición del contacto dentro de la red. Sin embargo, la gran diversidad de indicadores que se emplean en la literatura para medir esta fuerza del vínculo da fe de la vaguedad en la definición del concepto y las consecuentes dificultades para operativizarlo, dando lugar a resultados ambivalentes en su observación empírica. Con este trabajo de revisión teórica, metodológica y empírica se pre- tende ofrecer una base sobre la cual contribuir a la delimitación del concepto. Se propone una dimensionalización teórica de la noción, distinguiendo sus aspectos expresivos, sociales y estructurales, y a continuación se compara el comportamiento de diversos indicadores de las distintas dimensiones empleando una muestra de 441 redes personales y 13.230 relaciones provenientes de una encuesta realizada en Cataluña entre 2009 y 2010.

  16. Cultura intraemprendedora e innovación: un estudio empírico en las MIPYME turísticas colombianas

    Directory of Open Access Journals (Sweden)

    Edgar J. Gálvez Albarracín

    2011-12-01

    Full Text Available El objeto de este trabajo es verificar empíricamente la relación existente entre la cultura de intraemprendimiento y la innovación en las empresas. Para ello se realizó un estudio empírico con 68 MIPYME** del sector turístico de Colombia. Los resultados muestran que las prácticas asociadas al intraemprendimiento ejercen influencia positiva sobre la innovación de las MIPYME, y en especial, sobre la de sus procesos productivos y su gestión. Los hallazgos tienen implicaciones para los empresarios ya que les permite comprobar la utilidad del emprendimiento corporativo para el desarrollo de sus organizaciones. Muestra además al sector público, la academia y a las entidades de fomento, la importancia de impulsar programas de investigación, formación y asesoría en el campo del intraemprendimiento, para lograr mayor innovación y competitividad empresarial, lo cual puede redundar a su vez en mayor desarrollo regional y nacional

  17. Evaluación de un modelo de la brdf a partir de simulaciones con modelos semi-empíricos lineales (sel

    Directory of Open Access Journals (Sweden)

    Edgardo Rafael Medrano Ruedaflores

    2013-07-01

    Full Text Available Los modelos semi-empíricos lineales, también conocidos como modelos lineales basados en kernels, han sido utilizados con relativo éxito en la derivación de parámetros biofísicos de la vegetación a partir de imágenes satelitales. Su construcción se basa en hipótesis difíciles de corroborar y su calibración demanda suponer condiciones de homogeneidad en el sistema suelo-vegetación-atmósfera. Un modelo de la BRDF libre de estas limitaciones es evaluado en este estudio simulando el proceso de dispersión de la radiación solar según diferentes configuraciones de cobertura terrestre. Los datos fueron generados mediante la implementación de cuatro modelos lineales basados en kernels. Se evaluó el ajuste del modelo en cada escenario simulado a través de regresión lineal simple, obteniéndose valores del coeficiente de determinación superiores a 0.98. Los resultados sugieren que es posible utilizar el modelo evaluado en aplicaciones donde actualmente se emplean modelos semi-empíricos lineales.

  18. Ayudas públicas a la innovación: una evidencia empírica de la PYME industrial del sureste mexicano

    Directory of Open Access Journals (Sweden)

    Gabriel Góngora-Biachi

    2009-08-01

    Full Text Available Este trabajo tiene como propósito estudiar la existencia de tres tipos de sesgo en el proceso de solicitud y concesión de ayudas a la innovación a la PYME industrial en México (sesgo de motivación, sesgo de selección administrativa y sesgo de información. Para ello se realiza un estudio empírico sobre 169 PYME industriales, subvencionadas y no subvencionadas. Los datos del estudio empírico han sido recogidos a través de un cuestionario dirigido al gerente de la empresa. Los resultados muestran que las empresas que solicitan ayudas públicas cuentan con una mejor tecnología. Las empresas elegidas por la Administración para otorgar las ayudas tienen tecnología fuerte-buena, estrategia exploradora-analizadora y una mayor proporción de exportaciones. Finalmente se obtiene, al analizar el sesgo de información en las empresas que no solicitan ayudas, que las mejor informadas se caracterizan por tener un mayor grado de exportación y ser más antiguas.

  19. Plutarque contre Colotès contre Empédocle Plutarch against Colotes against Empedocles Plutarco contro Colote contro Empedocle

    Directory of Open Access Journals (Sweden)

    Alain Gigandet

    2013-05-01

    Full Text Available In the section of Against Colotes dedicated to the polemic that the Epicurean, in his writing, developed against Empedocles, Plutarch uses what he considers a bad procedure to traverse the area of dialectic and to arrive at that of the principles of Atomist physics, whose incoherence he feigns to demonstrate.Dans la partie du Contre Colotès consacrée à la polémique que l’épicurien, dans son écrit, développait contre Empédocle, Plutarque utilise ce qu’il considère comme un mauvais procès pour passer du terrain dialectique à celui des principes de la physique atomiste, dont il prétend montrer l’incohérence.Dans la partie du Contre Colotès consacrée à la polémique que l’épicurien, dans son écrit, développait contre Empédocle, Plutarque utilise ce qu’il considère comme un mauvais procès pour passer du terrain dialectique à celui des principes de la physique atomiste, dont il prétend montrer l’incohérence.

  20. Relationships between the use of Embden Meyerhof pathway (EMP) or Phosphoketolase pathway (PKP) and lactate production capabilities of diverse Lactobacillus reuteri strains.

    Science.gov (United States)

    Burgé, Grégoire; Saulou-Bérion, Claire; Moussa, Marwen; Allais, Florent; Athes, Violaine; Spinnler, Henry-Eric

    2015-10-01

    The aims of this study is to compare the growth and glucose metabolism of three Lactobacillus reuteri strains (i.e. DSM 20016, DSM 17938, and ATCC 53608) which are lactic acid bacteria of interest used for diverse applications such as probiotics implying the production of biomass, or for the production of valuable chemicals (3-hydroxypropionaldehyde, 3-hydroxypropionic acid, 1,3-propanediol). However, the physiological diversity inside the species, even for basic metabolisms, like its capacity of acidification or glucose metabolism, has not been studied yet. In the present work, the growth and metabolism of three strains representative of the species diversity have been studied in batch mode. The strains were compared through characterization of growth kinetics and evaluation of acidification kinetics, substrate consumption and product formation. The results showed significant differences between the three strains which may be explained, at least in part, by variations in the distribution of carbon source between two glycolytic pathways during the bacterial growth: the phosphoketolase or heterolactic pathway (PKP) and the Embden-Meyerhof pathway (EMP). It was also shown that, in the context of obtaining a large amount of biomass, DSM 20016 and DSM 17938 strains were the most effective in terms of growth kinetics. The DSM 17938 strain, which shows the more significant metabolic shift from EMP to PKP when the pH decreases, is more effective for lactate production.

  1. Límites de las formas organizacionales hibridas: Evaluación teórica y análisis de investigaciones empíricas

    Directory of Open Access Journals (Sweden)

    Maria Valentina Locher

    2017-01-01

    Full Text Available El concepto de formas organizacionales híbridas resulta clave para las investigaciones empíricas realizadas en el marco de la Nueva Economía Institucional. Las formas híbridas suelen considerarse un avance de dicho programa, sin embargo, aquí se argumentará lo contrario: este concepto evidencia limitaciones en las hipótesis fundamentales de aquel programa de investigaciones económicas. En este trabajo se muestra cómo el concepto de formas híbridas es utilizado para interpretar una realidad socioeconómica que desborda los límites de las formas mercantiles de coordinación económica. Luego se mostrará que ello, en el marco de la Nueva Economía Institucional, supone una paradoja insalvable. Finalmente se ensayan nuevas hipótesis para superar esta limitación y se muestran las consecuencias de este problema sobre dos investigaciones empíricas que desbordaron los límites de las formas organizacionales hibridas.

  2. Contramedidas em segurança da informação e vulnerabilidade cibernética: evidência empírica de empresas brasileiras

    Directory of Open Access Journals (Sweden)

    Igor Siqueira Cortez

    2013-12-01

    Full Text Available Recentemente, uma série de ataques cibernéticos a empresas e governos no Brasil e no exterior tornou público o potencial impacto econômico desse tipo de atividade, do ponto de vista tanto privado quanto público. Existe extensa literatura econômica - teórica e empírica - que avalia os incentivos para que as empresas adotem ou não medidas de segurança da informação. No presente estudo foi desenvolvida uma avaliação empírica desse fenômeno no Brasil. Modelos logit e probit ordenado foram desenvolvidos como forma de avaliar os efeitos sobre a probabilidade de ocorrência de problemas de segurança da informação, levando-se em conta as características das firmas, inclusive as medidas de segurança de informação. Os resultados apontam para uma relação positiva entre as medidas de segurança da informação e a probabilidade de identificar a ocorrência de problemas cibernéticos, sugerindo que a sofisticação dessas medidas de proteção aumenta a probabilidade de identificação dos problemas.

  3. Prácticas de presupuesto de capital: evaluación empírica en un grupo de empresas del sector de la construcción en Colombia

    OpenAIRE

    Ochoa Yepes, Julián

    2014-01-01

    El análisis empírico de presupuesto de capital o valoración de inversiones ha sido un tema ampliamente estudiado principalmente en países desarrollados como Estados Unidos, Reino Unido y Canadá -- Sin embargo la evidencia en países emergentes es escasa -- Mediante este artículo se pretende dar inicio a evidenciar las prácticas de presupuesto de capital a través de un estudio empírico realizado en un grupo de empresas del sector de la construcción en Colombia -- De las empresas encuestadas se ...

  4. Bancos Cooperativos y Sociedades de Ahorro y Crédito en El Salvador: modelo de supervisión prudencial y análisis empírico del coeficiente de solvencia

    OpenAIRE

    Hernández, Ana Verónica

    2013-01-01

    Estudio bibliográfico empírico, con el que se presenta una propuesta de supervisión para la superintendencia financiera de El Salvador, que incluye requisitos mínimos a considerar por el auditor, tomando como base Basilea II, III y siguiendo el Modelo OSFI de Canadá. Además se presenta un estudio empírico sobre los determinantes del coeficiente patrimonial en bancos cooperativos y sociedades de ahorro y crédito de El Salvador. Economía Financiera y Contabilidad Máster en Investigación ...

  5. Modeling dry and wet deposition of sulfate, nitrate, and ammonium ions in Jiuzhaigou National Nature Reserve, China using a source-oriented CMAQ model: Part II. Emission sector and source region contributions.

    Science.gov (United States)

    Qiao, Xue; Tang, Ya; Kota, Sri Harsha; Li, Jingyi; Wu, Li; Hu, Jianlin; Zhang, Hongliang; Ying, Qi

    2015-11-01

    A source-oriented Community Multiscale Air Quality (CMAQ) model driven by the meteorological fields generated by the Weather Research and Forecasting (WRF) model was used to study the dry and wet deposition of nitrate (NO3(-)), sulfate (SO4(2-)), and ammonium (NH4(+)) ions in the Jiuzhaigou National Nature Reserve (JNNR), China from June to August 2010 and to identify the contributions of different emission sectors and source regions that were responsible for the deposition fluxes. Contributions from power plants, industry, transportation, domestic, biogenic, windblown dust, open burning, fertilizer, and manure management sources to deposition fluxes in JNNR watershed and four EANET sites are determined. In JNNR, 96%, 82%, and 87% of the SO4(2-), NO3(-) and NH4(+) deposition fluxes are in the form of wet deposition of the corresponding aerosol species. Industry and power plants are the two major sources of SO4(2-) deposition flux, accounting for 86% of the total wet deposition of SO4(2-), and industry has a higher contribution (56%) than that of power plants (30%). Power plants and industry are also the top sources that are responsible for NO3(-) wet deposition, and contributions from power plants (30%) are generally higher than those from industries (21%). The major sources of NH4(+) wet deposition flux in JNNR are fertilizer (48%) and manure management (39%). Source-region apportionment confirms that SO2 and NOx emissions from local and two nearest counties do not have a significant impact on predicted wet deposition fluxes in JNNR, with contributions less than 10%. While local NH3 emissions account for a higher fraction of the NH4(+) deposition, approximately 70% of NH4(+) wet deposition in JNNR originated from other source regions. This study demonstrates that S and N deposition in JNNR is mostly from long-range transport rather than from local emissions, and to protect JNNR, regional emission reduction controls are needed. Copyright © 2015 Elsevier B.V. All

  6. Insect cells are superior to Escherichia coli in producing malaria proteins inducing IgG targeting PfEMP1 on infected erythrocytes

    Directory of Open Access Journals (Sweden)

    Joergensen Louise

    2010-11-01

    Full Text Available Abstract Background The PFD1235w Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1 antigen is associated with severe malaria in children and can be expressed on the surface of infected erythrocytes (IE adhering to ICAM1. However, the exact three-dimensional structure of this PfEMP1 and its surface-exposed epitopes are unknown. An insect cell and Escherichia coli based system was used to express single and double domains encoded by the pfd1235w var gene. The resulting recombinant proteins have been evaluated for yield and purity and their ability to induce rat antibodies, which react with the native PFD1235w PfEMP1 antigen expressed on 3D7PFD1235w-IE. Their recognition by human anti-malaria antibodies from previously infected Tanzanian donors was also analysed. Methods The recombinant proteins were run on SDS-PAGE and Western blots for quantification and size estimation. Insect cell and E. coli-produced recombinant proteins were coupled to a bead-based Luminex assay to measure the plasma antibody reactivity of 180 samples collected from Tanzanian individuals. The recombinant proteins used for immunization of rats and antisera were also tested by flow cytometry for their ability to surface label 3D7PFD1235w-IE. Results All seven pAcGP67A constructs were successfully expressed as recombinant protein in baculovirus-infected insect cells and subsequently produced to a purity of 60-97% and a yield of 2-15 mg/L. By comparison, only three of seven pET101/D-TOPO constructs expressed in the E. coli system could be produced at all with purity and yield ranging from 3-95% and 6-11 mg/L. All seven insect cell, but only two of the E. coli produced proteins induced antibodies reactive with native PFD1235w expressed on 3D7PFD1235w-IE. The recombinant proteins were recognized in an age- and transmission intensity-dependent manner by antibodies from 180 Tanzanian individuals in a bead-based Luminex assay. Conclusions The baculovirus based insect cell

  7. Identifying the source region of plasmaspheric hiss

    Czech Academy of Sciences Publication Activity Database

    Laakso, H.; Santolík, Ondřej; Horne, R.; Kolmašová, Ivana; Escoubet, P.; Masson, A.; Taylor, P.

    2015-01-01

    Roč. 42, č. 9 (2015), s. 3141-3149 ISSN 0094-8276 R&D Projects: GA MŠk LH12231 Institutional support: RVO:68378289 Keywords : plasmaspheric hiss * plasmaspheric drainage plumes * plasmasphere * equatorial region of plumes Subject RIV: BL - Plasma and Gas Discharge Physics Impact factor: 4.212, year: 2015 http://onlinelibrary.wiley.com/doi/10.1002/2015GL063755/full

  8. Agua y mortalidad en Barranquilla 1920-1940, del imaginario social a la realidad empírica: una mirada desde la Historia y la Salud Pública

    Directory of Open Access Journals (Sweden)

    Jorge Bilbao Ramírez

    2009-01-01

    Resultados: Los resultados empíricos sobre el comportamiento de la mortalidad mostraron que el acueducto inaugurado en 1929 no produjo impacto positivo alguno en las tasas de mortalidad general, infantil y específica por enfermedades hídricas, mientras que la revisión documental de carácter histórico, permitió construir argumentos para describir las razones que dieron origen al imaginario social del aumento de la salubridad como consecuencia de la puesta en marcha del nuevo acueducto. Conclusión: El mito histórico de buenos niveles de salubridad en la Barranquilla de los años 30s como consecuencia del suministro de agua por el acueducto inaugurado en 1929 resulta inaceptable desde una investigación total que conjuga la visión histórica y epidemiológica.

  9. Los impuestos como determinantes de la inversión empresarial. Evidencia empírica en empresas españolas que no cotizan en bolsa

    Directory of Open Access Journals (Sweden)

    Juan Monterrey Mayoral

    2017-07-01

    Full Text Available En este artículo se analiza si el deseo de evitar pagos fiscales futuros, calculados en términos de impuestos diferidos netos que se registran en los balances generales de las empresas, podría erigirse, junto con los factores explicativos documentados en la bibliografía anterior, como un determinante de la inversión empresarial. Nuestro análisis empírico aporta resultados sólidos que dejan constancia de que los pagos fiscales futuros son una motivación adicional para adoptar decisiones de inversión. No obstante, nuestros hallazgos también ponen de manifiesto que, hasta cierto punto, las motivaciones de carácter tributario podrían explicar situaciones de sobreinversión, si bien la evidencia que se ha obtenido de dichos episodios muestra una moderada significación estadística.

  10. Distribución condicional de los retornos de la tasa de cambio colombiana: un ejercicio empírico a partir de modelos GARCH univariados.

    Directory of Open Access Journals (Sweden)

    Santiago Gallón Gómez

    2010-05-01

    Full Text Available Un conjunto de modelos GARCH multivariados son estimados y su validez empírica comparada a partir del cálculo de la medida VaR, para los retornos diarios de la tasa de cambio nominal del peso colombiano con respecto al dólar americano, euro, libra esterlina y yen japonés en el periodo 1999–2005. La comparación de las estimaciones para la matriz de covarianza condicional y los resultados obtenidos para la proporción de fallo y el contraste de cuantil dinámico de Engle y Manganelli (2004 presentan evidencia a favor del modelo de correlación condicional constante.

  11. Diferencias del clima laboral entre empleados contratados por outsourcing y empleados directos: evidencia empírica de la zona norte de Colombia.

    Directory of Open Access Journals (Sweden)

    David Juliao Esparragoza

    2014-12-01

    Full Text Available Son pocos los estudios empíricos sobre clima laboral en Colombia que muestran las diferencias entre grupos de trabajadores que, teniendo las mismas funciones en la empresa, cuentan con diferentes tipos de contrato. Esta investigación, a partir de un estudio realizado con empleados de una importante empresa de bebidas ubicada en la costa norte de Colombia, trata de aportar a la resolución de esta carencia, verificando si existen diferencias significativas, en algunas variables del clima laboral, entre los grupos de trabajadores contratados directamente y aquellos vinculados por prestación de servicios. El trabajo es de tipo descriptivo y transversal, se apoya en el método hipotético inductivo y utiliza el instrumento imcoc (evaluando las diferencias inter-grupales en las seis variables que lo componen, a saber: objetivos, cooperación, liderazgo, toma de decisiones, relaciones interpersonales, motivación y control.

  12. Evolución y determinantes de las exportaciones industriales regionales: evidencia empírica para Colombia (1977-2002

    Directory of Open Access Journals (Sweden)

    Lotero Contreras Jorge

    2011-09-01

    Full Text Available
    Este artículo examina el impacto de las variables macroeconómicas, de la productividad y de la
    geografía sobre las exportaciones industriales colombianas entre 1977 y 2002, usando datos de la
    Encuesta Nacional Manufacturera y de Comercio Exterior del DANE. El estudio se centra en las
    exportaciones al mundo, a Estados Unidos y a la Comunidad Andina de Naciones-CAN. La
    estrategia empírica incluye análisis de datos de panel cuyos resultados sugieren que para los
    mercados considerados, la distancia, la productividad y la protección efectiva tienen un efecto
    apreciable –aunque diferenciado–, sobre el comportamiento de las exportaciones industriales

  13. Impacto de la innovación sobre el rendimiento de la mipyme: Un estudio empírico en Colombia

    Directory of Open Access Journals (Sweden)

    Edgar Julián Gálvez Albarracín, Ph.D

    2012-01-01

    Full Text Available El objetivo de este trabajo es verificar empíricamente la relación existente entre el grado de innovación de la empresa y su rendimiento, para lo cual se realiza un estudio con sesenta micro, pequeñas y medianas empresas (MIPYME de mediana y alta tecnología de la ciudad de Cali (Colombia. Los resultados muestran que la innovación en productos y en procesos ejerce una influencia positiva sobre el rendimiento de la MIPYME. Estos hallazgos refuerzan los postulados que muestran a la innovación como una ventaja competitiva sostenible, así mismo pueden ser de utilidad para los empresarios, al constatar la necesidad de innovar para mejorar su competitividad y para la administración pública en su papel de promotora de la innovación a través de programas de apoyo financiero y no financiero.

  14. Análisis de la Simplificación de Expresiones Numéricas en Español mediante un Estudio Empírico

    Directory of Open Access Journals (Sweden)

    Susana Bautista

    2012-12-01

    Full Text Available En este artículo se presentan los resultados de un estudio empírico llevado a cabo con un corpus paralelo de textos originales y simplificados a mano, y una posterior encuesta online, con el objetivo de identificar operaciones de simplificación de expresiones numéricas en español. Consideramos una "expresión numérica" como una frase que expresa una cantidad que puede venir acompañada de un modificador numérico, como por ejemplo casi un cuarto. Los resultados se analizan considerando las expresiones numéricas en oraciones con y sin contexto, a partir del análisis del corpus y del análisis de los resultados recogidos en la encuesta. Consideramos como trabajo futuro llevar a cabo una implementación computacional de las reglas de transformación extraídas.

  15. A economia da sonegação: teorias e evidências empíricas The economics of tax evasion: theories and emprirical evidences

    Directory of Open Access Journals (Sweden)

    Marcelo Lettieri Siqueira

    2005-12-01

    Full Text Available Este artigo fornece uma visão geral da literatura teórica e empírica, nacional e internacional, acerca do estudo econômico da sonegação de impostos. Após apresentar uma definição da sonegação fiscal, em confronto com a elisão fiscal, e analisar a questão da mensuração da sonegação, discutimos o modelo básico de análise da sonegação fiscal de Allingham e Sandmo (1972, apresentamos uma revisão de suas numerosas extensões, avaliamos os efeitos da política de imposição tributária sobre a decisão de sonegar e, por fim, examinamos as evidências empíricas acerca do comportamento do contribuinte e dos níveis de sonegação gerados por ele.This paper provides an overview of the findings of the theoretical and empirical literature on tax evasion. After we define tax evasion, as opposed to tax avoidance, and analyze the question of the tax evasion measurement, we discuss the Allingham and Sandmo's basic model on tax evasion, with a brief review of its numerous extensions, we deal with the effects of tax enforcement policy on the decision to evade taxes, and, finally, we survey the empirical evidence on taxpayer compliance and the tax gap produced for the taxpayer behavior.

  16. Determinantes de la inversión en I+D: un análisis empírico en empresas europeas de software y servicios informáticos

    OpenAIRE

    Fernández López, Javier

    2013-01-01

    Estudio empírico de los factores determinantes de la inversión en I+D en empresas europeas de software y servicios informáticos entre 2004-2010 Economía Financiera y Contabilidad Máster en Contabilidad y Gestión Financiera

  17. Booster parameter list

    International Nuclear Information System (INIS)

    Parsa, Z.

    1986-10-01

    The AGS Booster is designed to be an intermediate synchrotron injector for the AGS, capable of accelerating protons from 200 MeV to 1.5 GeV. The parameters listed include beam and operational parameters and lattice parameters, as well as parameters pertaining to the accelerator's magnets, vacuum system, radio frequency acceleration system, and the tunnel. 60 refs., 41 figs

  18. Lumped-parameter models

    Energy Technology Data Exchange (ETDEWEB)

    Ibsen, Lars Bo; Liingaard, M.

    2006-12-15

    A lumped-parameter model represents the frequency dependent soil-structure interaction of a massless foundation placed on or embedded into an unbounded soil domain. In this technical report the steps of establishing a lumped-parameter model are presented. Following sections are included in this report: Static and dynamic formulation, Simple lumped-parameter models and Advanced lumped-parameter models. (au)

  19. Disorder parameter of confinement

    International Nuclear Information System (INIS)

    Nakamura, N.; Ejiri, S.; Matsubara, Y.; Suzuki, T.

    1996-01-01

    The disorder parameter of confinement-deconfinement phase transition based on the monopole action determined previously in SU(2) QCD are investigated. We construct an operator which corresponds to the order parameter defined in the abelian Higgs model. The operator shows proper behaviors as the disorder parameter in the numerical simulations of finite temperature QCD. (orig.)

  20. Estructura y Funcionamiento del Proceso de Cálculo del Coste en los Servicios Hospitalarios: Una Experiencia Empírica.

    Directory of Open Access Journals (Sweden)

    Daniel Carrasco Díaz

    1997-12-01

    Full Text Available El objeto del trabajo se concreta en explicitar, sintéticamente, las cuestiones planteadas en la aplicación de un modelo de costes a un proceso productivo peculiar como es la actividad hospitalaria. Lo anterior se hace en base a la experiencia empírica de un estudio llevado a cabo en varios hospitales del Servicio Andaluz de Salud para determinar el coste de los centros de explotación del hospital y de sus productos o servicios sanitarios prestados. Una vez justificado el enfoque de asignación de costes más idóneo, se catalogan los factores y lugares específicos de dicha actividad, como instrumentos básicos en su aplicación. Finalmente, se ponen de relieve los problemas y soluciones adoptadas en el proceso de cálculo para cuantificar el computo de los diversos factores y el análisis que requiere la elección de las claves de reparto, tanto para su asignación entre todos los centros, como en la redistribución del coste absorbido por los auxiliares entre los principales para determinar su montante total, así como las dificultades que conlleva un análisis comparativo de los principales datos de la investigación empírica.The purpose of the study is to demonstrate, synthetically, the problems raised in the application of a costs model to a peculiar productive process as is hospital activity. The foregoing is based on the empirical experience of a study carried out in several hospitals of the "Servicio Andaluz de Salud" to determine the cost of the hospital development centres, and of its products or the health services it offers. Once the most suitable cost approach has been justified, the specific factors and places of side activity is catalogued as basic instruments in its application. Finally, we explain the problems and solutions adopted in the calculation to quantify the various factors, and the analysis required by the choice of the allotment criteria, both with respects to its allocation amog redistribution of the cost

  1. Productividad de recursos humanos, innovación de producto y desempeño exportador: Una investigación empírica

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    Rafael Reina Valle

    2016-04-01

    Full Text Available Objeto: El objetivo de esta investigación es examinar las relaciones entre la productividad de los recursos humanos (RRHH, la innovación de productos y el desempeño exportador de la PYME manufacturera española. Diseño/metodología: La proposición central de esta investigación es que la productividad de los RRHH facilita el desarrollo de innovaciones de producto para incrementar el desempeño exportador de las empresas. El modelo conceptual propuesto se contrasta empleando la técnica de la modelización de ecuaciones estructurales basada en la varianza y el método de estimación de los mínimos cuadrados parciales, sobre una muestra de 858 PYMES manufactureras españolas. Aportaciones y resultados: El análisis empírico da apoyo a la proposición central e indica que la productividad de los RRHH facilita el desarrollo de innovaciones de producto para incrementar el desempeño exportador. Limitaciones: Esta investigación sólo se centra en el rol de la innovación de producto en la relación entre la productividad de los RRHH y el desempeño exportador. También sería interesante estudiar el papel mediador de capacidades organizativas basadas en otros tipos de innovaciones  (p.e., la innovación en procesos, organizativa o en marketing. Implicaciones prácticas: Sugerir a los empresarios de PYMES que incrementos  en la productividad de los RRHH puede llevar a que dichos impactos sean capturados por la innovación dando lugar a la generación de nuevos productos, que conllevará shocks de demanda, y en consecuencia de un mayor incremento de la exportación de sus empresas. Valor añadido: Esta investigación explica conceptualmente y demuestra empíricamente que la innovación de producto es un mecanismo intermedio clave, a través del cual, la mayor productividad de los RRHH se convierte en un mayor desempeño exportador de la PYME manufacturera española.

  2. Contraste empírico de la transferencia de tecnología en tres empresas de agricultura protegida en México

    Directory of Open Access Journals (Sweden)

    Carlos Gabriel Borbón Morales

    2015-01-01

    Full Text Available De acuerdo a algunos modelos teóricos de la transferencia de tecnología las empresas aprenden de otras empresas; en otras ocasiones las tecnologías se transfieren a partir de una política dirigida por el Gobierno donde las firmas, los centros de investigación y las instituciones de educación superior confluyen trasladando el conocimiento de un actor a otro; otro más, advierte la participación activa de la sociedad civil, que derivado de sus necesidades se transforma en el eje que articula el tránsito del conocimiento hacia su aplicación. En este trabajo se realiza un análisis de dichos modelos, con el fin de contrastarlos empíricamente utilizando casos de empresas que incorporan tecnología para la producción de hortalizas en invernaderos, caracterizando a sus actores, relacionando estas características y evaluando y las formas en las cuales estas empresas han vivido sus procesos de contacto, adaptación y modificación de la tecnología. Palabras clave: transferencia de tecnología, agricultura protegidaDe acuerdo a algunos modelos teóricos de la transferencia de tecnología las empresas aprenden de otras empresas; en otras ocasiones las tecnologías se transfieren a partir de una política dirigida por el Gobierno donde las firmas, los centros de investigación y las instituciones de educación superior confluyen trasladando el conocimiento de un actor a otro; otro más, advierte la participación activa de la sociedad civil, que derivado de sus necesidades se transforma en el eje que articula el tránsito del conocimiento hacia su aplicación. En este trabajo se realiza un análisis de dichos modelos, con el fin de contrastarlos empíricamente utilizando casos de empresas que incorporan tecnología para la producción de hortalizas en invernaderos, caracterizando a sus actores, relacionando estas características y evaluando y las formas en las cuales estas empresas han vivido sus procesos de contacto, adaptación y modificaci

  3. Empirical evidence of S-curves in the Colombian Evidencia empírica de la curva S en las balanzas comerciales bilaterales de Colombia

    Directory of Open Access Journals (Sweden)

    Lorena Andrea Palacios-Chacón

    2012-06-01

    Full Text Available The Marshall-Lerner condition, the J-curve and S-curve have emerged as theoretical  and empirical foundations developed for the study of the interaction between exchange rates and international patterns of bilateral trade. They have a significant bearing on thedevelopment of public policy, and are of equal interest to the academic and professional communities. The most recently developed of these theories, the S-Curve, is named after the theorized short-run behavior to be found in the cross-correlation function of the real exchange rate and the trade balance. Considering this theoretical context, the paper seeks empirical evidence of the existence of the S-Curve in the bilateral trade in commodity and non-commodity goods between Colombia and the United States and Venezuela, its main trading partners, for the yearly quarters between 1994:1 and 2009:4.La condición Marshall-Lerner la curva J y la curva S han surgido como elementos teóricos y empíricos desarrollados para el estudio de la interacción entre las tasas de cambio y los patrones internacionales de comercio bilateral. Estas poseen una relevancia significativa en el desarrollo de política pública nacional y han sido objeto de estudio por la comunidad académica y profesional. La más reciente de estas teorías, la curva S, se conoce como la conducta que se teoriza hallar en la función de correlación cruzada entre la tasa de cambio real y la balanza comercial a corto plazo. Basado en dicho contexto teórico, este artículo busca evidencia empírica sobre la existencia de la curva S en el intercambio comercial bilateral de bienes commodities y non-commodities entre Colombia y Estados Unidos y Venezuela, sus principales socios comerciales, en los trimestres entre 1994:1 y 2009:4.

  4. Evidencia Empírica de la Minería de Procesos en la Implantación de CMMI-DEV

    Directory of Open Access Journals (Sweden)

    Paola E. Velazquez-Solis

    2016-11-01

    Full Text Available La minería de procesos tiene como objetivo descubrir, monitorear y mejorar procesos a través del análisis de los diversos registros de eventos generados por los procesos de la organización. El objetivo de este trabajo es presentar la evidencia empírica de la inclusión estratégica de la disciplina de minería de procesos en proyectos de mejora de procesos de software implementados con CMMI. En el proceso de mapeo sistemático de la revisión de la literatura, se establecieron cuatro categorías para clasificar los hallazgos encontrados (Fundamentos teóricos, propuestas, herramientas y sistemas de información y algoritmos para presentar los estudios que cumplen con el objetivo. Se concluye que la interdisciplinariedad de la minería de procesos con un modelo de referencia de procesos como CMMI-DEV apoya la implementación y evaluación de las áreas de procesos, al aplicar técnicas y algoritmos de minería de procesos que faciliten la exploración y explotación de los registros de eventos relacionados a la ejecución de las actividades almacenados en un repositorio.

  5. El papel moderador de la asertividad y la ansiedad social en el acoso psicológico en el trabajo: dos estudios empíricos

    Directory of Open Access Journals (Sweden)

    BERNARDO MORENO-JIMÉNEZ

    2006-01-01

    Full Text Available Tradicionalmente, la investigación sobre el acoso psicológico se ha focalizado en los estresores laborales y los factores contextuales como factores antecedentes. Sin embargo, la asociación entre los antecedentes organizacionales y el acoso es compleja y son varias las características de personalidad y factores individuales que pueden actuar como moderadores de esta relación (Einarsen, 2000. Para contrastarlo, se llevaron a cabo dos estudios empíricos para examinar el papel moderador de la personalidad en el proceso del acoso psicológico en el trabajo. En el primer estudio la muestra estuvo formada por 120 inmigrantes latinoamericanos. De acuerdo con la hipótesis inicial, los resultados de los análisis de regresión múltiple jerárquica mostraron que la asertividad moderaba la relación entre el antecedente organizacional inequidad laboral y el acoso psicológico. El segundo estudio se realizó en 183 víctimas de acoso. Los resultados mostraron que la ansiedad social y la asertividad moderaban la relación entre el acoso y sus efectos sobre la salud. Además, se encontraron diferencias de género en las quejas de salud derivadas del acoso.

  6. Teoría de la Aceptación-Rechazo Interpersonal (IPARTheory: bases conceptuales, método y evidencia empírica

    Directory of Open Access Journals (Sweden)

    Ronald P. Rohner

    2014-12-01

    Full Text Available La teoría de aceptación-rechazo interpersonal (IPARTheory es una teoría basada en la evidencia que trata de predecir y explicar las principales causas, consecuencias y correlatos de la aceptación-rechazo -especialmente parental- a lo largo del ciclo vital. Esta teoría se divide en tres subteorías: subteoría de la personalidad (todos los niños y niñas independientemente de su contexto sociocultural, racial o étnico responden esencialmente en el mismo sentido cuando perciben que son rechazados o aceptados por sus padres u otras figuras de apego; subteoría del afrontamiento (determinados factores individuales proporcionan tanto a niños como a adultos la fortaleza de afrontar más eficazmente las experiencias de rechazo; y subteoría de los sistemas socioculturales (el rechazo parental ocurre en un contexto ecológico, más global, que abarca la familia, la comunidad y en un entorno sociocultural. El método en la IPARTheory se caracteriza por utilizar una estrategia multimétodo desde una perspectiva transcultural, y por proveer un marco conceptual para integrar los estudios empíricos sobre aceptación-rechazo interpersonal desde una perspectiva del ciclo vital.

  7. Evaluación empírica del mapeo de reglas de negocio para el desarrollo de ontologías

    Directory of Open Access Journals (Sweden)

    Emiliano Reynares

    2014-12-01

    Full Text Available Las metodologías de desarrollo de ontologías usadas como un artefacto de software aún constituyen un campo abierto de investigación. Esto se debe a la inmadurez de las metodologías actuales; donde las más reconocidas se basan en UML por ser éste un lenguaje maduro para los ingenieros de software. Trabajos recientes proponen el mapeo de expresiones SBVR a sentencias ontológicas como técnica de desarrollo, pero hasta el momento existe sólo un estudio empírico que compara técnicas basadas en SBVR y UML. El presente trabajo analiza la factibilidad técnica del mapeo SBVR a OWL 2 presentando una primera réplica diferenciada del experimento original variando los enfoques considerados y el tamaño y composición de las unidades experimentales, comparando técnicas de desarrollo basadas en SBVR y ODM. Los resultados obtenidos permiten sostener la factibilidad técnica de los mapeos SBVR a OWL 2, como una técnica de desarrollo de ontologías por ingenieros de software.

  8. Las distintas caras del presidencialismo: debate conceptual y evidencia empírica en dieciocho países de América Latina

    Directory of Open Access Journals (Sweden)

    Santiago Basabe-Serrano

    2017-01-01

    Full Text Available Este artículo propone una nueva tipología sobre el presidencialismo en la que la interacción de las dimensiones política (poderes institucionales y partidistas del presidente y contextual (estado de la economía del país y aprobación ciudadana al presidente da cuenta tanto de la intensidad con la que se presenta dicha forma de gobierno como del tipo de relaciones políticas y sociales que de allí se derivan. Tomando como referentes empíricos a dieciocho países de América Latina, el artículo plantea cuatro tipos ideales de presidencialismo: imperial, condicionado, mínimo y de transición. Venezuela y Ecuador aparecen como los referentes de presidencialismo imperial mientras que Honduras y Paraguay se encuentran en el límite entre el presidencialismo condicionado y el presidencialismo mínimo.

  9. Evidencia empírica de los economistas españoles tras 5 años de aplicación de la reforma contable

    Directory of Open Access Journals (Sweden)

    Salvador Marín Hernández

    2015-01-01

    Full Text Available Transcurridos 5 años desde la aplicación efectiva de la reforma contable en España, con el presente trabajo se ha buscado mostrar la opinión de los «Economistas Expertos en Contabilidad e Información Financiera» (ECIFCGE sobre diversas cuestiones relacionadas con la misma. Para ello se ha utilizado una base empírica obtenida de sendas encuestas realizadas en 2008, 2009 y, la última, a finales del año 2012. De forma general se concluye que los economistas españoles, de este ámbito de la profesión, tienen un amplio conocimiento de la normativa que emana de la reforma contable; que este ha aumentado y/o se ha consolidado con el paso del tiempo; que las complicaciones han disminuido con el transcurso del mismo, que ven ahora con menos distancia la adaptación y el uso de las NIC/NIIF, y que su dominio ha aumentado con el grado de conocimiento y formación. De forma específica siguen ocupando mayor dedicación las áreas de patrimonio neto, valoración de activos y pasivos financieros, derivados, grupos 8 y 9, partes vinculadas y resultados extraordinarios, pero con valores medios en disminución por cada año transcurrido.

  10. El diálogo entre la lógica y la ciencia empírica: sobre los modelos y la modelización

    Directory of Open Access Journals (Sweden)

    Daniel Vidart

    1984-05-01

    Full Text Available La preocupación contemporánea por refinar métodos y técnicas de investigación ha provocado un singular fenómeno en la ciencia o mejor, en la epistemología, que es aquella parte de la teoría del conocimiento aplicada a la obtención de un conocimiento científico válido. Por un lado, el exagerado afán de modelización ha desembocado en el platonismo de los modelos "neutros" o meta empíricos, (es decir, metafísicos y por otro, el perfeccionismo y aun preciosismo metodológicos han dado lugar al surgimiento de una nueva escolástica. Este artículo, al señalar dichas desviaciones, -en parte debidas a los desarrollos lógicos y lingüísticos del Circulo de Viena y sus seguidores-, sugiere que un retorno a las fuentes concretas de la factualidad puede constituir un saludable antídoto "nominalista" contra el exagerado "realismo" (en el sentido platónico de las esencias de los modelizadores y metodólogos que convierten a la teoría en el supremo expediente para interpretar el mundo mientras relegan a la praxis, que lo manipula y transforma, al papel de una desdeñable banausia.

  11. Contraste empírico del CAPM en el mercado accionario chileno Empirical test of the CAPM in the Chilean stock market

    Directory of Open Access Journals (Sweden)

    Carlos A Díaz Contreras

    2012-08-01

    Full Text Available El modelo de valoración de activos de capital (Capital Asset Pricing Model - CAPM es uno de los modelos más utilizados en la práctica para determinar el premio por riesgo de un activo individual o cartera. El presente trabajo realiza un contraste empírico del CAPM en el mercado accionario chileno, empleando las metodologías de serie temporal y de eficiencia media-varianza, basada en la estimación por el método generalizado de momentos (MGM. El contraste se llevó a cabo usando rentabilidades mensuales de títulos individuales para el periodo 1997-2007 y usando una cartera de igual ponderación como proxy para la cartera de mercado. Los resultados de todas las metodologías empleadas muestran que el CAPM explica satisfactoriamente el corte transversal de retornos esperados en Chile.The capital asset pricing model (CAPM is one of the most used models in practice to determine the risk premium of an individual asset or portfolio. This paper tests the CAPM in the Chilean stock market using the time series methodology and the generalized method of moments to test mean-variance efficiency. This work uses monthly returns of individual stocks between 1997 and 2007 and considers an equally weighted portfolio as a proxy for the market portfolio. The results show that the CAPM explains successfully the cross section of expected stock returns in Chile.

  12. Vienaudžu vardarbība, pašvērtējums un empātija.

    OpenAIRE

    Krieva, Ilze

    2013-01-01

    Pētījuma mērķis bija noskaidrot vai pastāv saistība starp vienaudžu vardarbību, pašvērtējumu un empātijas līmeni. Pētījumā piedalījās desmitās un vienpadsmitās klases skolēni, pusaudži vecumā no 15-17 gadiem (n= 50). Pētījumā tika izmantotas šādas metodes: Vardarbības aptauja “Kā tev klājas skolā” (V.Rumpētere, balstoties uz T.Auroras izstrādāto aptauju par dzīvi skolā („The life in School checklist”, Aurora&Thompson, 1987), Pašvērtējuma aptauja (Rosenberg Self-Esteem Scale, Rosenberg,...

  13. Capital social, capital intelectual e innovación de producto. Evidencia empírica en sectores manufactureros intensivos en tecnología

    Directory of Open Access Journals (Sweden)

    Miriam Delgado-Verde

    2013-10-01

    Full Text Available El importante papel adquirido por el capital social en los últimos años, debido a las características del entorno competitivo actual, así como las redes sociales a partir de las cuales se desarrolla, lleva a plantear un estudio como el presente. En este sentido, teniendo en cuenta la importancia de obtener recursos y conocimientos derivados de las interacciones entre los empleados de una organización, parece interesante analizar su relevancia dentro del proceso de innovación de producto por las exigencias competitivas del ámbito empresarial. De este modo, se propone un modelo teórico y empírico de capital social, basado en el Enfoque de Capital Intelectual, pero considerando estudios específicos sobre tal concepto, a partir del cual se pueda identificar su influencia sobre la innovación de producto. Así, este estudio arroja resultados positivos respecto a la relación entre las tres dimensiones de capital social: 1 red social, 2 visión compartida y 3 confianza y apoyo social, y la innovación de producto en los sectores españoles manufactureros de alta y media-alta tecnología.

  14. La satisfacción laboral en los establecimientos hoteleros. Análisis empírico en la provincia de Córdoba

    Directory of Open Access Journals (Sweden)

    Sandra María Sánchez Cañizares

    2007-01-01

    Full Text Available En los últimos años se vienen detectando cambios sustanciales en el ámbito del turismo y consideramos un elemento fundamental en el análisis de estos cambios determinar cuál es la situación actual de la satisfacción laboral de las personas que trabajan en esta actividad. El sector elegido para la realización de este trabajo se centra en las empresas hoteleras por su trato directo con el turista. La idoneidad de un estudio sobre la satisfacción de los empleados de hotel se justifica por su incidencia como factor de calidad en el servicio y, en última instancia, en la propia satisfacción del cliente. En este artículo se realiza una breve revisión teórica sobre el constructo satisfacción laboral, así como una aplicación empírica centrada en una muestra de hoteles de Córdoba, al sur de España, en el marco de un proyecto subvencionado por la Junta de Andalucía (España.

  15. Equivalência de estímulos e autismo: uma revisão de estudos empíricos

    Directory of Open Access Journals (Sweden)

    Camila Graciella Santos Gomes

    Full Text Available O modelo de equivalência de estímulos oferece uma especificação operacional do comportamento simbólico e tem orientado o ensino e a verificação objetiva de repertórios novos. Pessoas com autismo, caracterizadas por apresentarem, entre outras alterações, graves déficits de linguagem, poderiam se beneficiar de estratégias baseadas neste modelo. Este artigo apresenta uma revisão de publicações de estudos empíricos com autistas, fundamentados no paradigma de equivalência. Os resultados mostraram sucesso de alguns participantes e fracasso de outros. Os fracassos parecem residir mais em dificuldades em aprender relações arbitrárias e menos na emergência de relações novas após aquisição da linha de base. O desafio para a área é desenvolver procedimentos que favoreçam a aprendizagem de relações arbitrárias e, consequentemente, a formação de classes de estímulos equivalentes.

  16. El papel de las asociaciones de inmigrantes en la sociedad de acogida: cuestiones teóricas y evidencia empírica

    Directory of Open Access Journals (Sweden)

    Antonio Morell Blanch

    2014-11-01

    Full Text Available El asociacionismo, de inmigrantes o de autóctonos, es fruto de una necesidad humana: la necesidad de reunirse, dialogar, intercambiar afectos, inquietudes y experiencias. Pero además, en el caso de los inmigrantes, cuanto menos en las primeras fases del proceso migratorio, esta necesidad se acentúa por la sensación de aislamiento y soledad que provoca enfrentarse a un entorno desconocido. En este sentido, la importancia de las asociaciones de inmigrantes radica en que facilitan un marco de pertenencia que proporciona seguridad. Pese a ello, no faltan visiones críticas que consideran que las asociaciones de inmigrantes dificultan la integración en la sociedad de acogida en la medida que contribuyen a reproducir los esquemas propios de la sociedad de origen y comportan un replegamiento étnico. El presente artículo presenta los resultados del trabajo de campo realizado con el fin de verificar empíricamente la hipótesis de que el asociacionismo inmigrante a menudo actúa como catalizador del proceso de integración social de los inmigrantes.

  17. Análisis conductual aplicado en neuropsicología: fundamentos teóricos, experimentales y empíricos.

    Directory of Open Access Journals (Sweden)

    José Alonso Aguilar-Valera

    2016-01-01

    Full Text Available El presente artículo presenta una revisión teórica donde se expone la importancia que tienen los principios y técnicas conductuales dentro del ámbito de la rehabilitación neuropsicológica. En la intervención clínica con pacientes víctimas de disfunción, daño o deterioro neurológico, donde las consecuencias directas sobre el comportamiento son significativas, el uso de las estrategias provenientes de las técnicas de modificación de conducta (conductuales y/o conductual-cognitivas son importantes para el tratamiento de los diversos síndromes neuroconductuales, estando dentro de las competencias del especialista en esta área aplicada de las neurociencias. Además de describirse tanto aspectos teóricos como experimentales de principal relevancia para estos fines, también se mencionarán algunos estudios empíricos llevados a cabo, bajo una metodología de caso único, para una mejor comprensión sobre la utilidad aplicativa de los principios conductuales en el ámbito de la neuropsicología clínica.

  18. Positive Selection of Plasmodium falciparum Parasites With Multiple var2csa-Type PfEMP1 Genes During the Course of Infection in Pregnant Women

    Science.gov (United States)

    Salanti, Ali; Lavstsen, Thomas; Nielsen, Morten A.; Theander, Thor G.; Leke, Rose G. F.; Lo, Yeung Y.; Bobbili, Naveen; Arnot, David E.; Taylor, Diane W.

    2011-01-01

    Placental malaria infections are caused by Plasmodium falciparum–infected red blood cells sequestering in the placenta by binding to chondroitin sulfate A, mediated by VAR2CSA, a variant of the PfEMP1 family of adhesion antigens. Recent studies have shown that many P. falciparum genomes have multiple genes coding for different VAR2CSA proteins, and parasites with >1 var2csa gene appear to be more common in pregnant women with placental malaria than in nonpregnant individuals. We present evidence that, in pregnant women, parasites containing multiple var2csa-type genes possess a selective advantage over parasites with a single var2csa gene. Accumulation of parasites with multiple copies of the var2csa gene during the course of pregnancy was also correlated with the development of antibodies involved in blocking VAR2CSA adhesion. The data suggest that multiplicity of var2csa-type genes enables P. falciparum parasites to persist for a longer period of time during placental infections, probably because of their greater capacity for antigenic variation and evasion of variant-specific immune responses. PMID:21592998

  19. Innovación incremental basada en capacidades dinámicas. Evidencia empírica en las empresas peruanas

    Directory of Open Access Journals (Sweden)

    Alejandro Flores Castro

    2015-09-01

    Full Text Available Los resultados macroeconómicos logrados por el Perú en los últimos años, hacen prever uncrecimiento de la actividad empresarial desde la perspectiva de sus capacidades a fin dealcanzar posiciones de ventaja. Sin embargo, este crecimiento estará basado esencialmenteen procesos de mejora, no vislumbrándose un aporte significativo de parte de las empresasa desarrollar procesos de innovación radical o disruptiva, abocándose preferentemente aprocesos de innovación incremental o de bajo impacto. En la primera parte del documentose aborda el tema de la innovación como factor de ventaja competitiva basado en un modelode capacidades dinámicas, en el contexto de la teoría de recursos y capacidades, analizandolos diferentes modelos de innovación tecnológica. En la segunda parte del trabajo se presentaun modelo de innovación basada en capacidades dinámicas. Y finalmente se presenta lametodología y los resultados del el estudio empírico acerca de los procesos de innovaciónincremental que se dan en las empresas peruanas.

  20. La dimensión empírica de la estética en la educación escolar

    Directory of Open Access Journals (Sweden)

    Aurora Gordo Contreras

    2017-01-01

    Full Text Available Los hallazgos universales en eficacia escolar, sugieren comprender los operadores lógicos, las dinámicas y la influencia del contexto sociocultural en la formación de poblaciones educativas, poniendo en evidencia empírica, la contribución sociológica de campos como la estética para establecer una valoración de los efectos sensibles en la interacción social de comunidades educativas con su entorno cultural. Este estudio pretende establecer qué tipo de relaciones, impacto e impronta del contexto periférico escolar tienen confluencia en el comportamiento, tendencia y conducta socio-estética, en dos sectores escolares diferenciales; como también, qué factores condicionales al interior de la escuela potencian o disminuyen estos fenómenos, y de si estos se reproducen simétrica, diferenciada o disímilmente entre sí. Para dicho fin, se estudiaron 312 matrices de análisis por medio del modelo octádico de Mandoky; se tuvieron en cuenta 156 objetos y 156 actividades, ejecutadas por 30 estudiantes durante 16 actividades. Estudiantes de primero de primaria de las instituciones Gimnasio Galileo Galilei y escuela Rural del Sur. Los resultados expresan correlaciones significativas de estesis reproductiva interinstitucional, patrones temáticos de acción e influencias diferenciadas de factores condicionales por sector escolar.

  1. Impacto de la cultura organizacional sobre la innovación de las pymes: un estudio empírico en el Distrito Metropolitano de Quito

    Directory of Open Access Journals (Sweden)

    Karla María Alvarado Ramírez

    2015-05-01

    Full Text Available El propósito de esta investigación es examinar de manera empírica y cuantitativa el grado de relación existente entre la cultura organizacional y la innovación organizacional. Se realizó un estudio con 260 personas que ocupan cargos operativosy administrativos en las pymes del Distrito Metropolitano de Quito. Se analizó el tipo de cultura organizacional a través de la metodología propuesta por Cameron y Quinn, basada en el modelo Competing Value Framework, que permite identificar y clasificar a las empresas por el tipo de cultura dominante que presentan. Los resultados muestran que los tipos de cultura que inciden de forma favorable en la innovación organizacional son la cultura clan, de mercado y la de tipo adhocrática; sin embargo, una cultura muy jerarquizada presenta una correlación baja. Estos resultados resaltan la importancia que tiene la cultura organizacional, y refuerzan la idea de que el liderazgo genera mejoras en el desempeño e innovación organizacional.

  2. Innovación incremental basada en capacidades dinámicas. Evidencia empírica en las empresas peruanas

    Directory of Open Access Journals (Sweden)

    Alejandro Flores Castro

    2011-06-01

    Full Text Available Los resultados macroeconómicos logrados por el Perú en los últimos años, hacen prever uncrecimiento de la actividad empresarial desde la perspectiva de sus capacidades a fin dealcanzar posiciones de ventaja. Sin embargo, este crecimiento estará basado esencialmenteen procesos de mejora, no vislumbrándose un aporte significativo de parte de las empresasa desarrollar procesos de innovación radical o disruptiva, abocándose preferentemente aprocesos de innovación incremental o de bajo impacto. En la primera parte del documentose aborda el tema de la innovación como factor de ventaja competitiva basado en un modelode capacidades dinámicas, en el contexto de la teoría de recursos y capacidades, analizandolos diferentes modelos de innovación tecnológica. En la segunda parte del trabajo se presentaun modelo de innovación basada en capacidades dinámicas. Y finalmente se presenta lametodología y los resultados del el estudio empírico acerca de los procesos de innovaciónincremental que se dan en las empresas peruanas.

  3. Cómo Afectan los Impuestos a la Calidad del Resultado? Evidencia Empírica en las Empresas Españolas no Cotizadas.

    Directory of Open Access Journals (Sweden)

    Amparo Sánchez Segura

    2009-06-01

    Full Text Available El presente estudio tiene por objeto analizar empíricamente en qué medida los impuestos afectan a la calidad del resultado en las compañías españolas no cotizadas. Tomando una amplia muestra de empresas, documentamos en qué circunstancias la tributación puede reducir la calidad de la información contable. No obstante, el objetivo de reducir costes fiscales está confinado a las compañías que no presentan riesgos derivados del endeudamiento. Nuestros resultados se mantienen robustos tras controlar las características corporativas que la literatura señala como determinantes innatos de la calidad contable y empleando especificaciones alternativas.This paper presents the results of an empirical analysis of the extent to which taxes affect the earnings quality disclosed by non-listed Spanish companies. Based on a large sample of firms, we document the circumstances in which taxation may reduce the quality of accounting information. Notwithstanding, the aim for diminishing fiscal expenses is restricted to companies that are not exposed to the risks associated to leverage. Our results are robust after controlling for those corporate characteristics found by the published literature as innate determinants of the quality of accounting information as well as in the presence of alternative functional specifications.

  4. Regimes de crescimento econômico no Brasil: evidências empíricas e implicações de política

    Directory of Open Access Journals (Sweden)

    Eliane Araújo

    2012-08-01

    Full Text Available Este artigo investiga o regime de crescimento vigente na economia brasileira de 2001 a 2009, apresentando um modelo teórico que serve de base para a investigação empírica referente à economia brasileira. Os resultados mostram que internamente o regime de crescimento da economia brasileira é do tipo wage-led, mas quando se considera o setor externo, esse pode ser caracterizado como profit-led. Isso traz implicações importantes para a análise convencional dos efeitos de uma depreciação da taxa de câmbio sobre a produção doméstica, mais especificamente que uma depreciação na taxa de câmbio tende a ter efeitos expansionistas sobre a produção nacional.This article investigates the growth regime prevailing in the Brazilian economy from 2001 to 2009 by presenting a theoretical model that underpins the empirical research concerning the Brazilian economy. The results show that, internally, the growth regime of the Brazilian economy is wage-led, but when considering the external sector it can be characterized as profit-led. This has important implications for a conventional analysis of the effects of a depreciation of the exchange rate on domestic production. More specifically, depreciation in the exchange rate tends to have expansionary effects on domestic production.

  5. Abordagem holística do termo pessoa em um estudo empírico: uma análise crítica

    Directory of Open Access Journals (Sweden)

    David Lopes Neto

    Full Text Available O estudo analisa a semântica e a estrutura do termo pessoa (mulheres com HIV, mediante abordagem holística fundamentada no Modelo de Adaptação de Roy (Veritivity e na fenomenologia de Heidegger (Dasein. Pesquisa extraída da literatura das Ciências Enfermagem e Filosofia, através da técnica de documentação indireta, com utilização do modelo de análise de teoria de Chinn & Kramer, através do qual foram analisados os seguintes aspectos: objetividade, simplicidade, generalidade, acessibilidade e importância dos conceitos de pessoa e holismo no estudo empírico "Nutritional adaptation of women living with HIV: a pilot study", publicado na revista Holistic Nursing Practice, em 1997. Criticamente, a interpretação do termo pessoa se deu pela compreensão do ser enquanto um ser ôntico-ontológico, como forma de percepção verdadeira do sentido do ser (pessoa, como uma estrutura universal vivente em um mundo antropológico e social, ao qual mulheres com HIV podem se adaptar ao novo estilo de vida e receber atenção integral da enfermagem, principalmente no que concerne ao aspecto nutricional.

  6. Abordagem holística do termo pessoa em um estudo empírico: uma análise crítica

    Directory of Open Access Journals (Sweden)

    Lopes Neto David

    2002-01-01

    Full Text Available O estudo analisa a semântica e a estrutura do termo pessoa (mulheres com HIV, mediante abordagem holística fundamentada no Modelo de Adaptação de Roy (Veritivity e na fenomenologia de Heidegger (Dasein. Pesquisa extraída da literatura das Ciências Enfermagem e Filosofia, através da técnica de documentação indireta, com utilização do modelo de análise de teoria de Chinn & Kramer, através do qual foram analisados os seguintes aspectos: objetividade, simplicidade, generalidade, acessibilidade e importância dos conceitos de pessoa e holismo no estudo empírico "Nutritional adaptation of women living with HIV: a pilot study", publicado na revista Holistic Nursing Practice, em 1997. Criticamente, a interpretação do termo pessoa se deu pela compreensão do ser enquanto um ser ôntico-ontológico, como forma de percepção verdadeira do sentido do ser (pessoa, como uma estrutura universal vivente em um mundo antropológico e social, ao qual mulheres com HIV podem se adaptar ao novo estilo de vida e receber atenção integral da enfermagem, principalmente no que concerne ao aspecto nutricional.

  7. A Novel Domain Cassette Identifies Plasmodium falciparum PfEMP1 Proteins Binding ICAM-1 and Is a Target of Cross-Reactive, Adhesion-Inhibitory Antibodies

    DEFF Research Database (Denmark)

    Bengtsson, Anja; Jørgensen, Louise; Rask, Thomas Salhøj

    2013-01-01

    Cerebral Plasmodium falciparum malaria is characterized by adhesion of infected erythrocytes (IEs) to the cerebral microvasculature. This has been linked to parasites expressing the structurally related group A subset of the P. falciparum erythrocyte membrane protein 1 (PfEMP1) family of IE...... to ICAM-1. The ICAM-1-binding capacity of DC4 was mapped to the C-terminal third of its Duffy-binding-like beta 3 domain. DC4 was the target of broadly cross-reactive and adhesion-inhibitory IgG Abs, and levels of DC4-specific and adhesion-inhibitory IgG increased with age among P. falciparum......-exposed children. Our study challenges earlier conclusions that group A PfEMP1 proteins are not central to ICAM-1-specific IE adhesion and support the feasibility of developing a vaccine preventing cerebral malaria by inhibiting cerebral IE sequestration. The Journal of Immunology, 2013, 190: 240-249....

  8. Characterization and source regions of 51 high-CO events observed during Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Container (CARIBIC) flights between south China and the Philippines, 2005-2008

    Science.gov (United States)

    Lai, S. C.; Baker, A. K.; Schuck, T. J.; Slemr, F.; Brenninkmeijer, C. A. M.; van Velthoven, P.; Oram, D. E.; Zahn, A.; Ziereis, H.

    2011-10-01

    Carbon monoxide (CO) and other atmospheric trace constituents were measured from onboard an Airbus 340-600 passenger aircraft in the upper troposphere (UT) between south China and the Philippines during Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Container (CARIBIC) flights from May 2005 until March 2008. A total of 132 events having CO enhancements were observed in the UT over the region during the 81 CARIBIC flights from Frankfurt, Germany, to Manila, Philippines, with a stopover in Guangzhou, China. Among these, 51 high-CO events with enhancements more than 50 ppb above background were observed. For these events enhancements ranged from 52.7 to 221.3 ppb and persisted for 3 to 78 min (˜40 to 1200 km), indicating an influence of strong pollution from biomass/biofuel/fossil fuel burning on the trace gas composition of the UT. Back trajectory analysis shows that south China, the Indochinese Peninsula, and the Philippines/Indonesia are the main source regions of the high-CO events. The composition of air parcels originating from south China was found to be primarily influenced by anthropogenic urban/industrial emissions, while emissions from biomass/biofuel burning contributed substantially to CO enhancements from the Indochinese Peninsula. During the Philippines/Indonesia events, air parcel composition suggests contributions from both biomass/biofuel burning and urban/industrial sources. Long-range transport of air parcels from northeast Asia and India also contributed to CO enhancements in the UT over the region. The general features of regional influence, typical cases, and the contributions of biomass/biofuel burning and anthropogenic emissions are presented and discussed to characterize the air parcels during the observed high-CO events.

  9. Cosmological Parameters 2000

    OpenAIRE

    Primack, Joel R.

    2000-01-01

    The cosmological parameters that I emphasize are the age of the universe $t_0$, the Hubble parameter $H_0 \\equiv 100 h$ km s$^{-1}$ Mpc$^{-1}$, the average matter density $\\Omega_m$, the baryonic matter density $\\Omega_b$, the neutrino density $\\Omega_\

  10. Magnetic S-parameter

    DEFF Research Database (Denmark)

    Sannino, Francesco

    2010-01-01

    We propose a direct test of the existence of gauge duals for nonsupersymmetric asymptotically free gauge theories developing an infrared fixed point by computing the S-parameter in the electric and dual magnetic description. In particular we show that at the lower bound of the conformal window...... the magnetic S-parameter, i.e. the one determined via the dual magnetic gauge theory, assumes a simple expression in terms of the elementary magnetic degrees of freedom. The results further support our recent conjecture of the existence of a universal lower bound on the S parameter and indicates...

  11. Tipología Empírica de Adolescentes Consumidores de Drogas según el MACI Empirical Typology of Adolescent Drug Users According to the MACI

    Directory of Open Access Journals (Sweden)

    Ximena Faúndez

    2009-11-01

    Full Text Available Se presenta una tipología empírica de adolescentes consumidores de drogas desarrollada a partir de las escalas de patrones de personalidad del Inventario Clínico para Adolescentes de Millón (MACI.Se aplicó el MACI y una entrevista clínica semiestructurada a 116 adolescentes chilenos consumidores de drogas, de entre 13 y 19 años, tanto hombres como mujeres. El análisis de conglomerados sugirió una solución óptima de 3 tipos para la muestra de hombres, denominados Transgresor-Poderoso, Subclínico y Oposicionista-Autodegradante. En la muestra de mujeres se encontró una solución de 4 tipos, denominados Oposicionista-Transgresor, Inhibido-Autodegradante, Subclínico y en Riesgo. Esta tipología fue interpretada de acuerdo a los 3 grupos de escalas del MACI y a la información clínica, obteniéndose resultados consistentes con los antecedentes teóricos recabados.An empirical typology of adolescent drug users, using the personality pattern scales from the Millón Adolescent Clinical Inventory (MACI, is presented. The MACI and a clinical interview were applied to 116 Chilean adolescent drug users, between 13 and 19 years of age, both male and female. The cluster analysis results suggested for the male sample a solution composed of 3 personality types, named Unruly-Forceful, Subclinical, and Oppositional-Self Demeaning. The final solution of the female sample was composed of 4 types, named Oppositional-Unruly, Inhibited-Self-Demeaning, Subclinical and at Risk. This typology was interpreted according to the 3 groups of MACI scales and clinical information, obtaining consistent results with the theoretical background.

  12. Efectos de la gestión organizacional en la rentabilidad en PYMES: evidencias empíricas y algunas consideraciones teóricas

    Directory of Open Access Journals (Sweden)

    Willington Ortíz Rojas

    2010-08-01

    Full Text Available Cualquier resultado empresarial deviene de un proceso gerencial previo, el cual necesitó de una estructura organizacional que proporcionara forma y acción a los procesos de comunicación y decisión, acordados a su vez al interior de la figura formal de la firma. En este artículo se busca poner en consideración algunas propuestas teóricas a partir de evidencias empíricas, sobre las relaciones que surgen entre tales prácticas y los procesos gerenciales en las pequeñas y medianas empresas –Pymes– y sus resultados en términos de rentabilidad. Para esto se hizo uso de metodologías de análisis estadístico de datos (metodologías multifactoriales y econométricas (modelos de regresión que permitieron, por un lado, resumir el número y complejidad de las variables consideradas a aquellas más representativas según su influencia en los resultados, principalmente en el ROA (return on assets y en segundo lugar, indagar por las variables que mejor explican las diferencias en resultados financieros entre las empresas consideradas. Se pretende enriquecer el debate actual sobre la importancia de una gerencia articulada a las necesidades de las Pymes latinoamericanas, y la exploración de metodologías de intervención para la modernización de las actuales prácticas gerenciales en este tipo de organizaciones.

  13. La Activación de las Diferencias Temporales Positivas en Empresas Cotizadas Españolas: un Estudio Empírico

    Directory of Open Access Journals (Sweden)

    José Moreno Rojas

    2010-08-01

    Full Text Available El objetivo de este estudio es analizar los factores que pueden determinar la decisión de activar impuestos anticipados, también conocidos como activos fiscales diferidos. Esa decisión afecta a conceptos tales como: el resultado neto, el nivel de endeudamiento, o la liquidez de la empresa. Para el estudio empírico fue utilizado una muestra aleatoria de cuentas anuales de 124 empresas, cotizadas durante el período 1999-2001. Se dará continuidad posterior, con el análisis de las cuentas anuales de estas empresas españolas y brasileñas hasta el cierre del año de 2009, que posibilitará realizar un estudio comparativo. Para cada empresa y año, se ha calculado, el valor de una variable que mide el peso que las diferencias temporales positivas representan sobre el resultado contable, antes de los impuestos. Ante la comprobación del no cumplimiento de los requisitos necesarios para la aplicación de un análisis de varianza (ANOVA, fueron realizadas diversas pruebas no paramétricas, concretamente la prueba de la mediana y el análisis de la varianza de KrusKal-Wallis. Los resultados obtenidos demuestran que los niveles de endeudamiento, liquidez y rentabilidad son factores determinantes del peso, que las diferencias temporales positivas representan con respecto al resultado contable antes de los impuestos, apreciándose que un endeudamiento alto y una baja liquidez, aumentan la propensión a la activación de impuestos anticipados.

  14. Internet y su potencial en el marketing estratégico de precios: Una aproximación teórica y empírica

    Directory of Open Access Journals (Sweden)

    Darío Quiroga-Parra

    2016-01-01

    Full Text Available La dinámica de los procesos de desarrollo tecnológico digital se dio por la convergencia de las tecnologías de la información y la comunicación, en lo que hoy se denomina Internet. Señalándose a ésta como una eficaz herramienta estratégica de ventaja competitiva en las empresas, que logró interrelacionar y ampliar e internacionalizar los mercados en una red digital, mejorando de manera apreciable las relaciones con los clientes. El propósito del trabajo fue realizar un análisis bibliográfico del potencial del marketing digital estratégico desde la perspectiva de los precios y verificar el avance de la infraestructura tecnológica digital existente, de manera comparada. El trabajo se abordó en un análisis descriptivo de los trabajos precedentes, y cuantitativo desde los hechos reales del mercado internacional, en los periodos analizados, considerando la infraestructura tecnológica digital existente. Los resultados mostraron los avances del estado de la cuestión y los empíricos de las compras por Internet en el mundo por regiones. El artículo concluyó que los precios por Internet no indujeron la tendencia a la baja ni a la hipótesis del mercado perfecto. A la par, los países desarrollados y Asia-Pacífico lideraron el mercado digital, mientras América Latina señaló prudencia comercial.

  15. El patrimonio en la experiencia estética de lo cotidiano: Un estudio empírico a través de 60 plazas de Madrid.

    Directory of Open Access Journals (Sweden)

    Sara González Moratiel

    2017-11-01

    Full Text Available Desde la Carta de Venecia de 1964 sobre la Conservación y la Restauración de los Monumentos y los Sitios , el estudio y la preservación del patrimonio histórico han adquirido una importancia vital en las políticas urbanas. Sesenta años más tarde, queda totalmente consolidado, en la sociedad real, el culto por el patrimonio -histórico, arquitectónico, urbano o cultural- a través, principalmente, de su relación con la memoria y con el tiempo. Sin embargo, en ocasiones, debido a la industria del ocio o a políticas enfocadas al turismo que tienden a la “museificación” de los centros históricos, el patrimonio urbano corre el riesgo de ser excluido para la sociedad que lo habita en su cotidianidad, banalizando así “toda la riqueza de su autenticidad”. El presente trabajo trata de indagar, mediante un estudio empírico, sobre la relación entre la presencia de patrimonio edificado y la percepción de “lo bello” y “lo agradable” en 60 plazas públicas del centro histórico de Madrid. Los resultados experimentales abren el debate sobre tres cuestiones: la experiencia estética, como adelantó Dewey, no puede separarse de la experiencia ordinaria; el patrimonio edificado deviene pieza clave en dicha experiencia; la experiencia estética responde a una suerte de verdad que necesita de un patrimonio vivo.  

  16. Orientación empática de los estudiantes de dos escuelas de kinesiología de Chile

    Directory of Open Access Journals (Sweden)

    A.M. Rojas-Serey

    Full Text Available Objetivo. Conocer la orientación empática de los alumnos de la carrera de kinesiología de dos escuelas de la región metropolitana. Sujetos y métodos. Este trabajo corresponde a una investigación analítica de corte transversal realizada entre los meses de marzo y noviembre del año 2006. Participaron 274 alumnos de un universo de 351 correspondientes a los niveles I, III y V de la carrera de kinesiología de la Universidad de Chile y la Universidad Mayor. Se aplicó la escala de empatía médica de Jefferson (EEMJ. Para el análisis de los datos, se utilizó la prueba U no paramétrica de Wilcoxon-Mann-Whitney y la prueba no paramétrica de Kruskal-Wallis. Resultados. Se obtuvieron mayores puntuaciones en la EEMJ con significación estadística en el tercer y quinto nivel de la carrera con relación al primero (p < 0,05. No se encontraron diferencias significativas en las puntuaciones según sexo. Conclusiones. Existen mayores puntuaciones obtenidas en la EEMJ en los alumnos que están en niveles más avanzados de la carrera de kinesiología, y esta diferencia es significativa en ambas universidades. Las puntuaciones obtenidas en la EEMJ no tienen significación estadística en relación con la variable sexo en ambas universidades.

  17. Fatores de impacto na Atitude e na Intenção de uso do M-learning: um teste empírico

    Directory of Open Access Journals (Sweden)

    Renata Kurtz

    Full Text Available Este artigo apresenta os resultados de uma pesquisa empírica em que se propõe um modelo para avaliar a atitude e a intenção de uso do mobile-learning(m-learning por estudantes do ensino superior de um curso de administração baseado na teoria do flow, no Modelo de Aceitação de Tecnologia e na Teoria do Comportamento Planejado. A partir deste arcabouço teórico elaborou-se uma atividade prática envolvendo o uso de dispositivos com tecnologia móvel digital (celulares em que se buscou aplicar o m-learning para estimular os estudantes a unir a teoria à prática. Em seguida, foi feita uma survey respondida por 235 universitários, em que se buscou compreender os fatores que influenciam a atitude e a intenção de uso do m-learning para o processo de ensino-aprendizagem. Os dados coletados foram tratados por meio de equações estruturais e os resultados mostraram fortes efeitos positivos dos fatores utilidade, diversão e controle do comportamento percebidos pelos estudantes na atitude e na intenção de uso do m-learning. Por fim, verificou-se que a atividade de uso prático realizada com os alunos mostrou que o uso do celular em uma atividade acadêmica pôde proporcionar a construção e o entendimento deles das relações entre a teoria apresentada e a prática em um ambiente real.

  18. Compatibilidad o conflicto entre objetivos sociales y financieros de las microfinanzas: debates teóricos y evidencia empírica

    Directory of Open Access Journals (Sweden)

    Jorge Gutiérrez-Goiria

    2015-12-01

    Full Text Available Las microfinanzas representan un sector en crecimiento, que no está exento de cuestionamientos. Los efectos de estas prácticas, así como los posibles conflictos entre los objetivos sociales y financieros, son cuestiones aún debatidas que precisan profundización. El artículo parte de los análisis teóricos y empíricos, que abordan diferentes aspectos sobre las Instituciones Microfinancieras y su operativa. En el sector conviven los enfoques orientados a las necesidades de desarrollo y sociales, junto a otros más cercanos a la economía financiera y a la ampliación de la base del sistema financiero. Las posibles tensiones entre estas visiones, que podrían por ejemplo plantear problemas para trabajar atendiendo a los más pobres de forma sostenible, se sitúan como una preocupación clave. En este marco, partiendo de un profundo análisis teórico y bibliográfico, se realiza un estudio cuantitativo a partir de una amplia base de datos, que abarca más de 1.000 instituciones microfinancieras, tratadas con un Análisis de Componentes Principales. Además de arrojar luz sobre otras cuestiones, el artículo concluye que no existe una contradicción insoslayable entre la búsqueda de una mayor proyección social de las Instituciones Microfinancieras y su propia solvencia financiera, mostrando que, en la práctica, ambas cuestiones pueden ser compatibles y complementarias.

  19. Evaluación de la Utilidad de la Información Financiera Elaborada por la Pequeña Empresa: Un Estudio Empírico

    Directory of Open Access Journals (Sweden)

    Patricia Milanés Montero

    2006-06-01

    Full Text Available El importante papel económico y social que desempeñan las entidades de menores dimensiones en España y en toda Europa y el actual escenario de reforma contable en que nos encontramos justifican la importancia de analizar el grado de cumplimiento de los objetivos utilitaristas de la información contenida en las Cuentas Anuales elaboradas conforme a las normas domésticas actualmente en vigor. Así, en este trabajo se aporta evidencia empírica al respecto utilizando para ello una encuesta de opinión dirigida a los gerentes de estas empresas. Los resultados revelan que la información elaborada conforme a las normas domésticas incumple sus objetivos utilitaristas y que entre las causas de dicho incumplimiento atribuibles al empresario se encuentran su mentalidad de considerar la contabilidad como un gasto y no como una inversión y su escasa formación en materia contable.The important economic and social role that carry out the small entities in Spain and in all Europe and the current strategy of harmonising the financial information, make worth the analysis of the degree of execution of the objective of utility of the Annual Accounts elaborated according to the domestic standards. In this context, we provide empirical evidence about it by means of a questionnaire sent to the managers of these companies. The results obtained show that the financial information elaborated in conformity with the domestic accounting standards doesn't complete its objective of utility and that the causes of this that can be responsibility of the managers are their mentality of considering the accounting as a cost instead that an investment and their scarce formation in accounting.

  20. Mecanismos de emotividade em relatos de violência:estratégias de elicitação-empática e de (re enquadre sociocomunicativo

    Directory of Open Access Journals (Sweden)

    Kaline Girão Jamison

    2017-09-01

    Full Text Available Nesse trabalho buscamos analisar, - na dinâmica da interação entre duas mulheres em situação de violência e escrivãs, na ocasião dos registros de boletins de ocorrência (BO em uma Delegacia Especializada em Atendimento à Mulher (DEAM de Fortaleza, as categorias emotivas propostas por Caffi e Janney (1994- avaliatividade, proximidade, especificidade, evidencialidade e volicionalidade-, investigando a relação entre esses mecanismos emotivocomunicativos e seu papel como estratégia de elicitação empática (MARTINOVSKY; MAO, 2009, como também de elaboração de faces (GOFFMAN, 1967. O objetivo consiste, portanto, em examinar a comunicação emotiva, num contexto de relato de violência, e sua relação com processos de (re enquadre (frame sociocomuniticativo em conversas autênticas entre mulheres. Constatamos que é a partir da noção de enquadramento (frame que a situação interacional se organiza e que os papéis sociais são definidos. No caso das mulheres que se dirigiram à DEAM para realizar o BO, cada uma reivindica uma imagem social apropriada para as regras da interação comunicativa da qual fazem parte. Por exemplo, no caso das duas participantes que não desejaram requerer medidas legais contra seus agressores, apenas registrar a queixa, detectamos que elas se utilizaram de categorias emotivas no intuito de conquistarem a empatia da interlocutora e estabelecer uma maior adequação a seu enquadre sociocomunicativo. Palavras-Chave: Mecanismos de emotividade. Elaboração de Faces. Empatia. Interação.

  1. Fundamentos filosóficos y empíricos de la investigación en ciencia de la educación

    Directory of Open Access Journals (Sweden)

    Siegfried Uhl

    2006-01-01

    Full Text Available La palabra "ciencia" expresa el resultado de la actividad de la investigación en algún campo; las ciencias que investigan objetos o hechos que están en la realidad se llaman ciencias reales. La Ciencia de la Educación es una ciencia real. Por ciencia entendemos también la actividad investigadora. Las proposiciones científicas han de ser tan simples y generales como se pueda, han de ser objetivas y han de explicar si los hechos corresponden a nuestras hipótesis. La Ciencia de la Educación es empírica y ha de ser elaborada de un modo analítico-causal, predictivo y tecnológico. La Pedagogía Práctica, en cambio, ha de contener juicios de valor (los fines de la educación. Los métodos científicos cuantitativos utilizan el cálculo y elaboran leyes generales; los métodos cualitativos proporcionan la comprensión de casos particulares y de hechos complejos. Se suele admitir que en la investigación sobre la educación se utilizan los dos tipos de métodos, según cada cuestión. El proceso de investigación tiene seis pasos: planteamiento del problema, documentación sobre lo que ya se sabe de él, formulación de hipótesis, recopilación de datos, tratamiento e interpretación de los datos y descripción de los resultados.

  2. Factores Determinantes del Retraso en la Emisión del Informe de Auditoria. Un Análisis Empírico

    Directory of Open Access Journals (Sweden)

    Amparo Sánchez Segura

    2000-12-01

    Full Text Available El objetivo de este trabajo ha sido analizar, adoptando una metodología empírica, las causas determinantes del retraso en la emisión del informe de auditoria. Los resultados obtenidos, acordes con los documentados en la literatura contable referida a otros países, ponen de manifiesto que existe una consistente relación estadística entre el retraso en la firma del informe y la presencia de salvedades; además, agrupando las salvedades en función de su importancia, se ha comprobado que este retraso es mayor a medida que aumenta la gravedad de la salvedad recibida. También son variables relevantes para explicar el citado retraso la presencia de algunas características corporativas de las entidades y la firma de auditoria que ejecuta la misma. The purpose of this paper was to conduct an empirical analysis of the determinant factors for the delay in the release of the audit report Our results are consistent with those of previous studies carried out in other countries, in that they provide evidence on the existence of a consistent statistical relationship between the delay in signing the report and the existence of qualifications; moreover grouping the qualification in terms of their importance has verified that this delay is greater the more serious is the received qualification. We also found that certain corporate characteristics and the identity of the audit firm helped to explain the delay in the delivery of the audit report.

  3. SATELLITE CONSTELLATION DESIGN PARAMETER

    Indian Academy of Sciences (India)

    First page Back Continue Last page Overview Graphics. SATELLITE CONSTELLATION DESIGN PARAMETER. 1. ORBIT CHARACTERISTICS. ORBITAL HEIGHT >= 20,000 KM. LONGER VISIBILITY; ORBITAL PERIOD. PERTURBATIONS(MINIMUM). SOLAR RADIATION PRESSURE (IMPACTS ECCENTRICITY); LUNI ...

  4. Reassessment of safeguards parameters

    Energy Technology Data Exchange (ETDEWEB)

    Hakkila, E.A.; Richter, J.L.; Mullen, M.F.

    1994-07-01

    The International Atomic Energy Agency is reassessing the timeliness and goal quantity parameters that are used in defining safeguards approaches. This study reviews technology developments since the parameters were established in the 1970s and concludes that there is no reason to relax goal quantity or conversion time for reactor-grade plutonium relative to weapons-grade plutonium. For low-enriched uranium, especially in countries with advanced enrichment capability there may be an incentive to shorten the detection time.

  5. Safeguards systems parameters

    International Nuclear Information System (INIS)

    Avenhaus, R.; Heil, J.

    1979-01-01

    In this paper analyses are made of the values of those parameters that characterize the present safeguards system that is applied to a national fuel cycle; those values have to be fixed quantitatively so that all actions of the safeguards authority are specified precisely. The analysis starts by introducing three categories of quantities: The design parameters (number of MBAs, inventory frequency, variance of MUF, verification effort and false-alarm probability) describe those quantities whose values have to be specified before the safeguards system can be implemented. The performance criteria (probability of detection, expected detection time, goal quantity) measure the effectiveness of a safeguards system; and the standards (threshold amount and critical time) characterize the magnitude of the proliferation problem. The means by which the values of the individual design parameters can be determined with the help of the performance criteria; which qualitative arguments can narrow down the arbitrariness of the choice of values of the remaining parameters; and which parameter values have to be fixed more or less arbitrarily, are investigated. As a result of these considerations, which include the optimal allocation of a given inspection effort, the problem of analysing the structure of the safeguards system is reduced to an evaluation of the interplay of only a few parameters, essentially the quality of the measurement system (variance of MUF), verification effort, false-alarm probability, goal quantity and probability of detection

  6. Electroweak interaction parameters

    International Nuclear Information System (INIS)

    Marciano, W.J.

    1984-01-01

    After a presentation of the experimentally determined parameters of the standard SU(3) x SU(2) x U(1) model the author discusses the definition of the Weinberg angle. Then masses and widths of the intermediate vector bosons are considered in the framework of the Weinberg-Salam theory with radiative corrections. Furthermore the radiative decays of these bosons are discussed. Then the relations between the masses of the Higgs boson and the top quark are considered. Thereafter grand unification is briefly discussed with special regards to the SU(5) prediction of some observable parameters. Finally some speculations are made concerning the observation of radiative decays in the UA1 experiments. (HSI)

  7. Band parameters of phosphorene

    International Nuclear Information System (INIS)

    Lew Yan Voon, L C; Wang, J; Zhang, Y; Willatzen, M

    2015-01-01

    Phosphorene is a two-dimensional nanomaterial with a direct band-gap at the Brillouin zone center. In this paper, we present a recently derived effective-mass theory of the band structure in the presence of strain and electric field, based upon group theory. Band parameters for this theory are computed using a first-principles theory based upon the generalized-gradient approximation to the density-functional theory. These parameters and Hamiltonian will be useful for modeling physical properties of phosphorene. (paper)

  8. Band parameters of phosphorene

    DEFF Research Database (Denmark)

    Lew Yan Voon, L. C.; Wang, J.; Zhang, Y.

    2015-01-01

    Phosphorene is a two-dimensional nanomaterial with a direct band-gap at the Brillouin zone center. In this paper, we present a recently derived effective-mass theory of the band structure in the presence of strain and electric field, based upon group theory. Band parameters for this theory...... are computed using a first-principles theory based upon the generalized-gradient approximation to the density-functional theory. These parameters and Hamiltonian will be useful for modeling physical properties of phosphorene....

  9. An adaptive regularization parameter choice strategy for multispectral bioluminescence tomography

    Energy Technology Data Exchange (ETDEWEB)

    Feng Jinchao; Qin Chenghu; Jia Kebin; Han Dong; Liu Kai; Zhu Shouping; Yang Xin; Tian Jie [Medical Image Processing Group, Institute of Automation, Chinese Academy of Sciences, P. O. Box 2728, Beijing 100190 (China); College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124 (China); Medical Image Processing Group, Institute of Automation, Chinese Academy of Sciences, P. O. Box 2728, Beijing 100190 (China); Medical Image Processing Group, Institute of Automation, Chinese Academy of Sciences, P. O. Box 2728, Beijing 100190 (China) and School of Life Sciences and Technology, Xidian University, Xi' an 710071 (China)

    2011-11-15

    Purpose: Bioluminescence tomography (BLT) provides an effective tool for monitoring physiological and pathological activities in vivo. However, the measured data in bioluminescence imaging are corrupted by noise. Therefore, regularization methods are commonly used to find a regularized solution. Nevertheless, for the quality of the reconstructed bioluminescent source obtained by regularization methods, the choice of the regularization parameters is crucial. To date, the selection of regularization parameters remains challenging. With regards to the above problems, the authors proposed a BLT reconstruction algorithm with an adaptive parameter choice rule. Methods: The proposed reconstruction algorithm uses a diffusion equation for modeling the bioluminescent photon transport. The diffusion equation is solved with a finite element method. Computed tomography (CT) images provide anatomical information regarding the geometry of the small animal and its internal organs. To reduce the ill-posedness of BLT, spectral information and the optimal permissible source region are employed. Then, the relationship between the unknown source distribution and multiview and multispectral boundary measurements is established based on the finite element method and the optimal permissible source region. Since the measured data are noisy, the BLT reconstruction is formulated as l{sub 2} data fidelity and a general regularization term. When choosing the regularization parameters for BLT, an efficient model function approach is proposed, which does not require knowledge of the noise level. This approach only requests the computation of the residual and regularized solution norm. With this knowledge, we construct the model function to approximate the objective function, and the regularization parameter is updated iteratively. Results: First, the micro-CT based mouse phantom was used for simulation verification. Simulation experiments were used to illustrate why multispectral data were used

  10. Sea surface stability parameters

    International Nuclear Information System (INIS)

    Weber, A.H.; Suich, J.E.

    1978-01-01

    A number of studies dealing with climatology of the Northwest Atlantic Ocean have been published in the last ten years. These published studies have dealt with directly measured meteorological parameters, e.g., wind speed, temperature, etc. This information has been useful because of the increased focus on the near coastal zone where man's activities are increasing in magnitude and scope, e.g., offshore power plants, petroleum production, and the subsequent environmental impacts of these activities. Atmospheric transport of passive or nonpassive material is significantly influenced by the turbulence structure of the atmosphere in the region of the atmosphere-ocean interface. This research entails identification of the suitability of standard atmospheric stability parameters which can be used to determine turbulence structure; the calculation of these parameters for the near-shore and continental shelf regions of the U.S. east coast from Cape Hatteras to Miami, Florida; and the preparation of a climatology of these parameters. In addition, a climatology for average surface stress for the same geographical region is being prepared

  11. Measuring the chargino parameters

    Indian Academy of Sciences (India)

    by measuring the cross-sections with polarized beams at e+e- collider ... is given by the fundamental SUSY parameters: the SU(2) gaugino mass Е¾, the higgsino .... two points in the plane which are symmetric under the interchange ¾Д ° ¾К.

  12. General image acquisition parameters

    International Nuclear Information System (INIS)

    Teissier, J.M.; Lopez, F.M.; Langevin, J.F.

    1993-01-01

    The general parameters are of primordial importance to achieve image quality in terms of spatial resolution and contrast. They also play a role in the acquisition time for each sequence. We describe them separately, before associating them in a decision tree gathering the various options that are possible for diagnosis

  13. Quantization of physical parameters

    International Nuclear Information System (INIS)

    Jackiw, R.; Massachusetts Inst. of Tech., Cambridge; Massachusetts Inst. of Tech., Cambridge

    1984-01-01

    Dynamical models are described with parameters (mass, coupling strengths) which must be quantized for quantum mechanical consistency. These and related topological ideas have physical application to phenomenological descriptions of high temperature and low energy quantum chromodynamics, to the nonrelativistic dynamics of magnetic monopoles, and to the quantum Hall effect. (author)

  14. El debate sobre la convergencia económica internacional e interregional: enfoques teóricos y evidencia empírica

    Directory of Open Access Journals (Sweden)

    Edgard Moncayo

    2004-09-01

    Full Text Available La globalización, con sus efectos diferenciadores por países, regiones y grupos sociales, vuelve a animar el debate sobre la hipótesis de convergencia, a la base de la teoría neoclásica del crecimiento. En este artículo se lleva a cabo una exhaustiva revisión de la evidencia empírica sobre la cuestión convergencia/divergencia en los niveles de ingreso per cápita, entre países y entre regiones subnacionales. Se concluye que después de que en las décadas de los ‘60 y ‘70 se verificara un proceso de convergencia, a partir de los ‘80 la tendencia dominante es hacia la polarización. Esta evolución parecería estarle dando la razón a las teorías de crecimiento endógeno y la Nueva Geografía Económica, en el sentido de que la actividad productiva tiende a aglomerarse con una lógica de causación circular acumulativa, allí donde ya está concentrada.The discriminatory effects of globalization, in regard to countries, subnational regions and social groups, put new life into the debate over the convergence hypotesis, at the very base of the neoclassical growth theory. This paper offers an exhaustive revision of the empirical evidence regarding the convergence/divergence in per capita income level issue, both among countries as well as among subnational regions. It is concluded that after two a decades of convergence, in the sixties and seventies, from the eighties on there is a dominant trend towards polarization. This evolution seems to confirm the claims of endogenous growth theory and the New Economic Geography, in the sense that economic activity tends to agglomerate with a circular cause and effect logic, where it is already concentrated.

  15. Sheath and plasma parameters in a magnetized plasma system

    Indian Academy of Sciences (India)

    through the negatively biased grid from the source region into the diffused region. It is observed that the electron temperature increases with the magnetic field in the diffused region whereas it decreases in the source region of the system for a constant grid biasing voltage. Also, investigation is done to see the change of ...

  16. Por uma discussão ontológica e epistemológica dos ditos « Estudos Brasileiros » e algumas de suas consequências empíricas na França.

    Directory of Open Access Journals (Sweden)

    Márcia Marques Rambourg

    2012-09-01

    Full Text Available Os problemas que podemos identificar no termo “estudos brasileiros” podem-se ver sob dois ângulos principais: interno e externo, em relação à produção e à recepção dos mesmos, nos mais diversificados ramos da cultura brasileira no Brasil e no exterior. Aqui, identificaremos alguns pontos importantes a tal problemática, com pano de fundo argumentativo no contexto filosófico da alteridade dos estudos brasileiros. Analisaremos tais pontos sob as perspectivas ontológica, epistemológica e, finalmente, empírica.

  17. La relación entre la psicopatología y la obesidad infantil: aproximación a la comprobación empírica de un modelo etiológico

    OpenAIRE

    Gutiérrez Frutos, Ana

    2017-01-01

    Trabajo fin de Máster en Psicología General Sanitaria Modalidad: investigación aplicada El propósito del estudio fue realizar una primera comprobación empírica del modelo conceptual de Hemmingsson (2014) sobre la etiología de la obesidad infantil. En este estudio transversal participaron 113 niños/as españoles con exceso de peso (percentil >85), y el respectivo cuidador principal de 109 familias (mayoritariamente madres). Se realizó un análisis correlacional de distintos factores de rie...

  18. Validación de un modelo empírico para calcular, mediante laser y fotodiodo, la potencia en función de la distancia para un blanco difusor

    OpenAIRE

    Blázquez Campo, Pablo

    2012-01-01

    Este proyecto fin de carrera se centra en un estudio teórico y experimental de un sistema de emisión/recepción, formado por láser y fotodiodo, con el objetivo de validar un modelo empírico que describa el comportamiento de un blanco difusor iluminado con un haz colimado y describa la potencia recibida en función de la distancia con el punto de reflexión. A partir de los resultados experimentales, obtenidos y procesados mediante un software de aplicación general (Matlab) hallaremos la ecuación...

  19. Análisis empírico de la aplicación del modelo de modernización de la gestión para organizaciones en PyMEs colombianas

    Directory of Open Access Journals (Sweden)

    Rafael Pérez Uribe

    2013-08-01

    Full Text Available Esta publicación presenta tres grandes resultados de la aplicación del Modelo de Modernización para la Gestión de Organizaciones – MMGO- en 127 PyMEs colombianas: el análisis estadístico y psicométrico de los instrumentos utilizados en el MMGO, la evidencia empírica de la aplicación del Modelo en las 127 empresas y las recomendaciones para desarrollar una gestión empresarial de excelencia para la PyME colombiana.

  20. Optomechanical parameter estimation

    International Nuclear Information System (INIS)

    Ang, Shan Zheng; Tsang, Mankei; Harris, Glen I; Bowen, Warwick P

    2013-01-01

    We propose a statistical framework for the problem of parameter estimation from a noisy optomechanical system. The Cramér–Rao lower bound on the estimation errors in the long-time limit is derived and compared with the errors of radiometer and expectation–maximization (EM) algorithms in the estimation of the force noise power. When applied to experimental data, the EM estimator is found to have the lowest error and follow the Cramér–Rao bound most closely. Our analytic results are envisioned to be valuable to optomechanical experiment design, while the EM algorithm, with its ability to estimate most of the system parameters, is envisioned to be useful for optomechanical sensing, atomic magnetometry and fundamental tests of quantum mechanics. (paper)

  1. Critical parameters for ammonia

    International Nuclear Information System (INIS)

    Sato, M.; Masui, G.; Uematsu, M.

    2005-01-01

    (p, ρ, T) measurements and visual observations of the meniscus for ammonia were carried out carefully in the critical region over the range of temperatures: -1 K (T - T c ) 0.04 K, and of densities: -19 kg . m -3 (ρ - ρ c ) 19 kg . m -3 by a metal-bellows volumometer with an optical cell. Vapor pressures were also measured at T = (310, 350, and 400) K. The critical parameters of T c and ρ c were determined based on the results of observation of the critical opalescence. The critical pressure p c was determined from the present measurements at T c on the vapor pressure curve. Comparisons of the critical parameters with values given in the literature are presented

  2. Critical parameters for ammonia

    Energy Technology Data Exchange (ETDEWEB)

    Sato, M. [Center for Mechanical Engineering and Applied Mechanics, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522 (Japan); Masui, G. [Center for Mechanical Engineering and Applied Mechanics, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522 (Japan); Uematsu, M. [Center for Mechanical Engineering and Applied Mechanics, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522 (Japan)]. E-mail: uematsu@mech.keio.ac.jp

    2005-09-15

    (p, {rho}, T) measurements and visual observations of the meniscus for ammonia were carried out carefully in the critical region over the range of temperatures: -1 K (T - T {sub c}) 0.04 K, and of densities: -19 kg . m{sup -3} ({rho} - {rho} {sub c}) 19 kg . m{sup -3} by a metal-bellows volumometer with an optical cell. Vapor pressures were also measured at T = (310, 350, and 400) K. The critical parameters of T {sub c} and {rho} {sub c} were determined based on the results of observation of the critical opalescence. The critical pressure p {sub c} was determined from the present measurements at T {sub c} on the vapor pressure curve. Comparisons of the critical parameters with values given in the literature are presented.

  3. LMFBR plant parameters

    International Nuclear Information System (INIS)

    1979-03-01

    This document contains up-to-date data on existing or firmly decided prototype or demonstration LMFBR reactors (Table I), on planned commercial size LMFBR according to the present status of design (Table II) and on experimental fast reactors such as BOR-60, DFR, EBR-II, FERMI, FFTF, JOYO, KNK-II, PEC, RAPSODIE-FORTISSIMO (Table III). Only corrected and revised parameters submitted by the countries participating in the IWGFR are included in this document

  4. Ranking as parameter estimation

    Czech Academy of Sciences Publication Activity Database

    Kárný, Miroslav; Guy, Tatiana Valentine

    2009-01-01

    Roč. 4, č. 2 (2009), s. 142-158 ISSN 1745-7645 R&D Projects: GA MŠk 2C06001; GA AV ČR 1ET100750401; GA MŠk 1M0572 Institutional research plan: CEZ:AV0Z10750506 Keywords : ranking * Bayesian estimation * negotiation * modelling Subject RIV: BB - Applied Statistics, Operational Research http://library.utia.cas.cz/separaty/2009/AS/karny- ranking as parameter estimation.pdf

  5. Calculation of shielding parameters

    International Nuclear Information System (INIS)

    Montoya Z, J.

    1994-01-01

    With the propose of reduce the hazard to radiation, exist three basic factors: a) time, the time to exposition to working person inside to area, from exist determined speed the doses, is proportional of the time permanence; b) distance, the reduce to doses is inverse square of the distance to exposition point; c) building, consist to interpose between source and exposition point to material. The main aspect development to the analysis of parameters distance and building. The analysis consist to development of the mathematical implicit, in the model of source radioactive, beginning with the geometry to source, distance to exposition source, and configuration building. In the final part was realize one comparative studied to calculus of parameters to blinding, employs two codes CPBGAM and MICROSHIELD, the first made as part to work thesis. The point source its a good approximation to any one real source, but in the majority of the time to propose analysis the spatial distribution of the source must realized in explicit way. The buildings calculus in volumetry's source can be approximate begin's of plan as source adaptations. It's important to have present that not only the building exist the exposition to the radiation, and the parameters time and distance plays an important paper too. (Author)

  6. LMFBR plant parameters 1991

    International Nuclear Information System (INIS)

    1991-03-01

    The document has been prepared on the basis of information provided by the members of the IAEA International Working Group on Fast Reactors (IWGFR). It contains updated parameters of 27 experimental, prototype and commercial size liquid metal fast breeder reactors (LMFBRs). Most of the reactors are currently in operation, under construction or in an advanced planning stage. Parameters of the Clinch River Breeder Reactor (USA), PEC (Italy), RAPSODIE (France), DFR (UK) and EFFBR (USA) are included in the report because of their important role in the development of LMFBR technology from first LMFBRs to the prototype size fast reactors. Two more reactors appeared in the list: European Fast Reactor (EFR) and PRISM (USA). Parameters of these reactors included in this publication are based on the data from the papers presented at the 23rd Annual Meeting of the IWGFR. All in all more than four hundred corrections and additions have been made to update the document. The report is intended for specialists and institutions in industrialized and developing countries who are responsible for the design and operation of liquid metal fast breeder reactors

  7. Intensive parameters of enstatite chondrite metamorphism

    Science.gov (United States)

    Fogel, Robert A.; Hess, Paul C.; Rutherford, Malcolm J.

    1989-01-01

    A geothermometer based on the assemblage kamacite-quartz-enstatite-oldhamite-troilite found in enstatite chondrites is described. Data obtained with the geothermometer reveal that the EL6 meteorites experienced temperatures exceeding 1000 C. These temperatures imply a metal-sulfide melting event that may have fractionated the melt from the source region.

  8. ATLAS parameter study

    International Nuclear Information System (INIS)

    Adler, R.J.

    1994-01-01

    The purpose of this study is to make an independent assessment on the parameters chosen for the ATLAS capacitor bank at LANL. The contractor will perform a study of the basic pulsed power parameters of the ATLAS device with baseline functional parameters of >25 MA implosion current and <2.5 microsecond current risetime. Nominal circuit parameters held fixed will be the 14 nH from the vacuum interface to the load, and the nominal load impedances of 1 milliohm for slow loads and 10 milliohms for fast loads. Single Ended designs, as opposed to bipolar designs, will be studied in detail. The ATLAS pulsed power design problem is about inductance. The reason that a 36 MJ bank is required is that such a bank has enough individual capacitors so that the parallel inductance is acceptably low. Since about half the inductance is in the bank, and the inductance and time constant of the submodules is fixed, the variation of output with a given parameter will generally be a weak one. In general, the dl/dt calculation demonstrates that for the real system inductances, 700 kV is the optimum voltage for the bank to drive X-ray loads. The optimum is broad, and there is little reduction in performance at voltages as low as 450 kV. The direct drive velocity analysis also shows that the optimum velocity is between 480 and 800 kV for a variety of assumptions, and that there is less than a 10% variation in velocity over this range. Voltages in the 120 kV--600 kV range are desirable for driving heavy liners. A compromise optimum operating point might be 480 kV, at which all X-ray operation scenarios are within 10% of their velocity optimum, and heavy liners can be configured to be near optimum if small enough. Based on very preliminary studies the author believes that the choice of a single operating voltage point (say, 480 kV) is unnecessary, and that a bank engineered for dual operation at 480 and 240 kV will be the best solution to the ATLAS problem

  9. Radiation portal evaluation parameters

    International Nuclear Information System (INIS)

    York, R.L.

    1998-01-01

    The detection of the unauthorized movement of radioactive materials is one of the most effective nonproliferation measures. Automatic special nuclear material (SNM) portal monitors are designed to detect this unauthorized movement and are an important part of the safeguard systems at US nuclear facilities. SNM portals differ from contamination monitors because they are designed to have high sensitivity for the low energy gamma-rays associated with highly enriched uranium (HEU) and plutonium. These instruments are now being installed at international borders to prevent the spread of radioactive contamination an SNM. In this paper the parameters important to evaluating radiation portal monitors are discussed. (author)

  10. Buncher system parameter optimization

    International Nuclear Information System (INIS)

    Wadlinger, E.A.

    1981-01-01

    A least-squares algorithm is presented to calculate the RF amplitudes and cavity spacings for a series of buncher cavities each resonating at a frequency that is a multiple of a fundamental frequency of interest. The longitudinal phase-space distribution, obtained by particle tracing through the bunching system, is compared to a desired distribution function of energy and phase. The buncher cavity parameters are adjusted to minimize the difference between these two distributions. Examples are given for zero space charge. The manner in which the method can be extended to include space charge using the 3-D space-charge calculation procedure is indicated

  11. Infrared Drying Parameter Optimization

    Science.gov (United States)

    Jackson, Matthew R.

    In recent years, much research has been done to explore direct printing methods, such as screen and inkjet printing, as alternatives to the traditional lithographic process. The primary motivation is reduction of the material costs associated with producing common electronic devices. Much of this research has focused on developing inkjet or screen paste formulations that can be printed on a variety of substrates, and which have similar conductivity performance to the materials currently used in the manufacturing of circuit boards and other electronic devices. Very little research has been done to develop a process that would use direct printing methods to manufacture electronic devices in high volumes. This study focuses on developing and optimizing a drying process for conductive copper ink in a high volume manufacturing setting. Using an infrared (IR) dryer, it was determined that conductive copper prints could be dried in seconds or minutes as opposed to tens of minutes or hours that it would take with other drying devices, such as a vacuum oven. In addition, this study also identifies significant parameters that can affect the conductivity of IR dried prints. Using designed experiments and statistical analysis; the dryer parameters were optimized to produce the best conductivity performance for a specific ink formulation and substrate combination. It was determined that for an ethylene glycol, butanol, 1-methoxy 2- propanol ink formulation printed on Kapton, the optimal drying parameters consisted of a dryer height of 4 inches, a temperature setting between 190 - 200°C, and a dry time of 50-65 seconds depending on the printed film thickness as determined by the number of print passes. It is important to note that these parameters are optimized specifically for the ink formulation and substrate used in this study. There is still much research that needs to be done into optimizing the IR dryer for different ink substrate combinations, as well as developing a

  12. La equivalencia en la traducción de las unidades fraseológicas. Un estudio empírico

    Directory of Open Access Journals (Sweden)

    Germán Darío Mira Álvarez

    2011-04-01

    porque, con los procedimientos empleados, no siempre es posible conservar de manera simultánea sus componentes pragmalingüísticos y socioculturales, presentándose una pérdida significativa del sentido. Debido a esa complejidad, algunas estrategias y procedimientos de traducción de UF no deben tomarse apriorísticamente como los más o los menos apropiados, y sólo deben evaluarse en el contexto particular en el que se usan. Los resultados de este estudio empírico pueden considerarse como un método para evaluar la traducción de UF.

  13. Condicionantes en la utilización de los servicios de atención primaria: evidencias empíricas e inconsistencias metodológicas

    Directory of Open Access Journals (Sweden)

    Sáez M.

    2003-01-01

    Full Text Available Introducción: En España, el grado y las características de la utilización de los servicios sanitarios de atención primaria está siendo objeto de análisis desde, por lo menos, los años ochenta. Uno de los motivos principales es averiguar hasta qué punto dicha utilización se corresponde con unas necesidades de atención sanitaria. De hecho, se ha establecido como prioridad generalmente aceptada un servicio de salud adecuado para los pacientes que más lo necesitan. Factores condicionantes de la utilización: La evidencia muestra que las características del individuo, sobre todo su estado de salud, son las que se relacionan principalmente con la utilización de servicios de atención primaria. Otras características personales, como el sexo y la edad, podrían actuar como moduladores de la necesidad de atención. Algunas variables familiares y/o culturales, así como las variables relacionadas con el profesional sanitario y otras institucionales, podrían explicar también parte de la variabilidad observada en la utilización de los servicios de atención primaria. Respecto a las variables socioeconómicas, como la renta, se produce una situación paradójica. De forma añadida, existe una evidencia empírica que demuestra que la renta constituye el principal determinante, tanto de la utilización como del gasto sanitario. Cuando se analizan los datos individuales, sin embargo, dicha variable no está relacionada con la utilización de servicios de atención primaria. Inconsistencias metodológicas: La situación es controvertida, con implicaciones no simplemente metodológicas sino, sobre todo, respecto al análisis de la eficiencia en la utilización de los servicios sanitarios de atención primaria. El problema es que, revisando la bibliografía, se pueden apreciar ciertas inconsistencias metodológicas que podrían explicar, al menos en parte, la disparidad de los resultados obtenidos. Entre otras, cabe citar las siguientes

  14. Mercados futuro e à vista de açúcar: uma análise empírica de eficiência versus arbitragem

    Directory of Open Access Journals (Sweden)

    Roseli da Silva

    2010-06-01

    Full Text Available Este trabalho testa a hipótese de eficiência relativa dos mercados futuro e à vista (spot de açúcar, para dois horizontes de previsão, em contraposição à hipótese de arbitragem de commodities. Utiliza-se o modelo de não-arbitragem de Brenner e Kroner (1995 e aplica-se a metodologia de testes comparativos proposta por Kellard (2002, que usa a cointegração multivariada com restrição sobre o espaço de cointegração. A base de dados é formada a partir dos futuros do contrato número 11 negociado na Nybot (New York Board of Trade, dos preços no mercado à vista coletados pelo Cepea (Centro de Estudos Avançados em Economia Aplicada e da taxa de juros doméstica, todas em bases diárias (mai/97 a dez/07. A correspondência da amostra é construída de acordo com os vencimentos dos contratos, considerando-se dois períodos de previsão: 28 e 56 dias. Em linhas gerais, as evidências empíricas encontradas suportam a adequação da metodologia de cointegração para análise de eficiência relativa nos mercados de açúcar, em contraposição à hipótese de arbitragem. Além disso, geram evidências fracas de ineficiência, resultados sujeitos à hipótese de estacionariedade do custo de carregamento, exceto pelo componente taxa de juros.This study tests the relative efficiency hypothesis of future and spot sugar markets for two forecast horizons, as opposed to commodity arbitrage. It was used a no-arbitrage model of Brenner and Kroner (1995 and applied the methodology of comparative tests proposed by Kellard (2002, using multivariate cointegration methodology with restrictions on the cointegrated space. The database is formed by future prices of the number 11 contract traded on the Nybot (New York Board of Trade, domestic spot prices collected by Cepea (Center for Advanced Studies in Applied Economics and the domestic interest rate, all on daily basis (May/97 to Dec/07. The matching sample is constructed by the futures contract

  15. LMFBR plant parameters

    International Nuclear Information System (INIS)

    1985-07-01

    This document has been prepared on the basis of information compiled by the members of the IAEA International Working Group on Fast Reactors (IWGFR). It contains parameters of 25 experimental, prototype and commercial size liquid metal fast breeder reactors (LMFBR). Most of the reactors are currently in operation, under construction or in an advanced planning stage. Parameters of the Clinch River Breeder Reactor (USA) are presented because its design was nearly finished and most of the components were fabricated at the time when the project was terminated. Three reactors (RAPSODIE (France), DFR (UK) and EFFBR (USA)) have been shut down. However, they are included in the report because of their important role in the development of LMFBR technology from first LMFBRs to the prototype size fast reactors. The first LMFBRs (CLEMENTINE (USA), EBR-1 (USA), BR-2 (USSR), BR-5 (USSR)) and very special reactors (LAMPRE (USA), SEFOR (USA)) were not recommended by the members of the IWGFR to be included in the report

  16. Display Parameters and Requirements

    Science.gov (United States)

    Bahadur, Birendra

    The following sections are included: * INTRODUCTION * HUMAN FACTORS * Anthropometry * Sensory * Cognitive * Discussions * THE HUMAN VISUAL SYSTEM - CAPABILITIES AND LIMITATIONS * Cornea * Pupil and Iris * Lens * Vitreous Humor * Retina * RODS - NIGHT VISION * CONES - DAY VISION * RODS AND CONES - TWILIGHT VISION * VISUAL PIGMENTS * MACULA * BLOOD * CHOROID COAT * Visual Signal Processing * Pathways to the Brain * Spatial Vision * Temporal Vision * Colour Vision * Colour Blindness * DICHROMATISM * Protanopia * Deuteranopia * Tritanopia * ANOMALOUS TRICHROMATISM * Protanomaly * Deuteranomaly * Tritanomaly * CONE MONOCHROMATISM * ROD MONOCHROMATISM * Using Colour Effectively * COLOUR MIXTURES AND THE CHROMATICITY DIAGRAM * Colour Matching Functions and Chromaticity Co-ordinates * CIE 1931 Colour Space * CIE PRIMARIES * CIE COLOUR MATCHING FUNCTIONS AND CHROMATICITY CO-ORDINATES * METHODS FOR DETERMINING TRISTIMULUS VALUES AND COLOUR CO-ORDINATES * Spectral Power Distribution Method * Filter Method * CIE 1931 CHROMATICITY DIAGRAM * ADDITIVE COLOUR MIXTURE * CIE 1976 Chromaticity Diagram * CIE Uniform Colour Spaces and Colour Difference Formulae * CIELUV OR L*u*v* * CIELAB OR L*a*b* * CIE COLOUR DIFFERENCE FORMULAE * Colour Temperature and CIE Standard Illuminants and source * RADIOMETRIC AND PHOTOMETRIC QUANTITIES * Photopic (Vλ and Scotopic (Vλ') Luminous Efficiency Function * Photometric and Radiometric Flux * Luminous and Radiant Intensities * Incidence: Illuminance and Irradiance * Exitance or Emittance (M) * Luminance and Radiance * ERGONOMIC REQUIREMENTS OF DISPLAYS * ELECTRO-OPTICAL PARAMETERS AND REQUIREMENTS * Contrast and Contrast Ratio * Luminance and Brightness * Colour Contrast and Chromaticity * Glare * Other Aspects of Legibility * SHAPE AND SIZE OF CHARACTERS * DEFECTS AND BLEMISHES * FLICKER AND DISTORTION * ANGLE OF VIEW * Switching Speed * Threshold and Threshold Characteristic * Measurement Techniques For Electro-optical Parameters * RADIOMETRIC

  17. Timetable Attractiveness Parameters

    DEFF Research Database (Denmark)

    Schittenhelm, Bernd

    2008-01-01

    Timetable attractiveness is influenced by a set of key parameters that are described in this article. Regarding the superior structure of the timetable, the trend in Europe goes towards periodic regular interval timetables. Regular departures and focus on optimal transfer possibilities make...... these timetables attractive. The travel time in the timetable depends on the characteristics of the infrastructure and rolling stock, the heterogeneity of the planned train traffic and the necessary number of transfers on the passenger’s journey. Planned interdependencies between trains, such as transfers...... and heterogeneous traffic, add complexity to the timetable. The risk of spreading initial delays to other trains and parts of the network increases with the level of timetable complexity....

  18. Parameter measurement of target

    International Nuclear Information System (INIS)

    Gao Dangzhong

    2001-01-01

    The progress of parameter measurement of target (ICF-15) in 1999 are presented, including the design and contract of the microsphere equator profiler, the precise air bearing manufacturing, high-resolution X-ray image of multi-layer shells and the X-ray photos processed with special image and data software, some plastic shells measured in precision of 0.3 μm, the high-resolution observation and photograph system of 'dew-point method', special fixture of target and its temperature distribution measuring, the dew-point temperature and fuel gas pressure of shells measuring with internal pressure of 5 - 15 (x10 5 ) Pa D 2 and wall thickness of 1.5∼3 μm

  19. Safety Parameters Graphical Interface

    International Nuclear Information System (INIS)

    Canamero, B.

    1998-01-01

    Nuclear power plant data are received at the Operations Center of the Consejo de Seguridad Nuclear in emergency situations. In order to achieve the required interface and to prepare those data to perform simulation and forecasting with already existing computer codes a Safety Parameters Graphical Interface (IGPS) has been developed. The system runs in a UNIX environment and use the Xwindows capabilities. The received data are stored in such a way that it can be easily used for further analysis and training activities. The system consists of task-oriented modules (processes) which communicate each other using well known UNIX mechanisms (signals, sockets and shared memory segments). IGPS conceptually have two different parts: Data collection and preparation, and Data monitorization. (Author)

  20. varying elastic parameters distributions

    KAUST Repository

    Moussawi, Ali

    2014-12-01

    The experimental identication of mechanical properties is crucial in mechanics for understanding material behavior and for the development of numerical models. Classical identi cation procedures employ standard shaped specimens, assume that the mechanical elds in the object are homogeneous, and recover global properties. Thus, multiple tests are required for full characterization of a heterogeneous object, leading to a time consuming and costly process. The development of non-contact, full- eld measurement techniques from which complex kinematic elds can be recorded has opened the door to a new way of thinking. From the identi cation point of view, suitable methods can be used to process these complex kinematic elds in order to recover multiple spatially varying parameters through one test or a few tests. The requirement is the development of identi cation techniques that can process these complex experimental data. This thesis introduces a novel identi cation technique called the constitutive compatibility method. The key idea is to de ne stresses as compatible with the observed kinematic eld through the chosen class of constitutive equation, making possible the uncoupling of the identi cation of stress from the identi cation of the material parameters. This uncoupling leads to parametrized solutions in cases where 5 the solution is non-unique (due to unknown traction boundary conditions) as demonstrated on 2D numerical examples. First the theory is outlined and the method is demonstrated in 2D applications. Second, the method is implemented within a domain decomposition framework in order to reduce the cost for processing very large problems. Finally, it is extended to 3D numerical examples. Promising results are shown for 2D and 3D problems.

  1. Process Damping Parameters

    International Nuclear Information System (INIS)

    Turner, Sam

    2011-01-01

    The phenomenon of process damping as a stabilising effect in milling has been encountered by machinists since milling and turning began. It is of great importance when milling aerospace alloys where maximum surface speed is limited by excessive tool wear and high speed stability lobes cannot be attained. Much of the established research into regenerative chatter and chatter avoidance has focussed on stability lobe theory with different analytical and time domain models developed to expand on the theory first developed by Trusty and Tobias. Process damping is a stabilising effect that occurs when the surface speed is low relative to the dominant natural frequency of the system and has been less successfully modelled and understood. Process damping is believed to be influenced by the interference of the relief face of the cutting tool with the waveform traced on the cut surface, with material properties and the relief geometry of the tool believed to be key factors governing performance. This study combines experimental trials with Finite Element (FE) simulation in an attempt to identify and understand the key factors influencing process damping performance in titanium milling. Rake angle, relief angle and chip thickness are the variables considered experimentally with the FE study looking at average radial and tangential forces and surface compressive stress. For the experimental study a technique is developed to identify the critical process damping wavelength as a means of measuring process damping performance. For the range of parameters studied, chip thickness is found to be the dominant factor with maximum stable parameters increased by a factor of 17 in the best case. Within the range studied, relief angle was found to have a lesser effect than expected whilst rake angle had an influence.

  2. [Acoustical parameters of toys].

    Science.gov (United States)

    Harazin, Barbara

    2010-01-01

    Toys play an important role in the development of the sight and hearing concentration in children. They also support the development of manipulation, gently influence a child and excite its emotional activities. A lot of toys emit various sounds. The aim of the study was to assess sound levels produced by sound-emitting toys used by young children. Acoustical parameters of noise were evaluated for 16 sound-emitting plastic toys in laboratory conditions. The noise level was recorded at four different distances, 10, 20, 25 and 30 cm, from the toy. Measurements of A-weighted sound pressure levels and noise levels in octave band in the frequency range from 31.5 Hz to 16 kHz were performed at each distance. Taking into consideration the highest equivalent A-weighted sound levels produced by tested toys, they can be divided into four groups: below 70 dB (6 toys), from 70 to 74 dB (4 toys), from 75 to 84 dB (3 toys) and from 85 to 94 dB (3 toys). The majority of toys (81%) emitted dominant sound levels in octave band at the frequency range from 2 kHz to 4 kHz. Sound-emitting toys produce the highest acoustic energy at the frequency range of the highest susceptibility of the auditory system. Noise levels produced by some toys can be dangerous to children's hearing.

  3. Os Símbolos de Informação Pública nos Setores do Lazer e Turismo: resultados empíricos

    Directory of Open Access Journals (Sweden)

    Sérgio Ricardo Fiori

    2010-09-01

    Full Text Available  Resumo

    Atualmente a facilidade de comunicação e o rápido deslocamento permitem com que as pessoas usufruam de inúmeras atividades de lazer e turismo em diferentes escalas: dentro de casa, em sua cidade, estado ou país. O contexto faz com que os símbolos de informação pública se estabeleçam como agentes facilitadores de comunicação, sendo potencializados em locais que abrigam pessoas das mais diferentes nacionalidades e que, por sua vez, possuem limitações para se expressar em outros idiomas como em aeroportos, eventos internacionais e centros históricos. Deste modo, ressalta-se o grande desafio de estudos sobre o tema evidenciando a questão cultural e a problemática quanto a compreendê-los, aceitá-los. O artigo aborda de maneira breve alguns estudos teóricos, além de apresentar uma pesquisa empírica realizada com oitenta e dois símbolos de informação pública.

    Palavras-chave: símbolo de informação pública; pictograma; comunicação; lazer; turismo.  AbstractNowadays the ease of communication and the

  4. Empātijas atšķirības improvizācijas teātru, amatierteātru un koru dalībniekiem

    OpenAIRE

    Nikolajeva, Inga

    2012-01-01

    Pētījuma mērķis ir noskaidrot empātijas atšķirības starp improvizācijas teātru, amatierteātru un koru dalībniekiem. Izlasi veido 106 respondenti, no tiem 41 improvizācijas teātru dalībnieks, 34 amatierteātru dalībnieki un 31 koru dalībnieks kā kontroles grupa – respondenti, kuriem tā ir brīvā laika aktivitāte ārpus darba. Dalībnieki ir 14 vīrieši un 92 sievietes vecumā no 18 līdz 30 gadiem, dalībnieku pieredzes ilgums aktiermākslā ir no 1 līdz 15 gadiem. Pētījumā tiek izmantota Saimona Barona...

  5. Efecto de la innovación en el crecimiento y el desempeño de las Mipymes de la Alianza del Pacífico. Un estudio empírico

    Directory of Open Access Journals (Sweden)

    Domingo García-Pérez de Lema

    2016-10-01

    Full Text Available Este trabajo analiza el efecto de la actividad innovadora sobre el crecimiento y el rendimiento de las Mipyme de los países de la Alianza del Pacífico (AP. Para ello se realizó un estudio empírico con una muestra de 386 empresas de Chile, Colombia, México y Perú. Para verificar las relaciones planteadas se utilizan regresiones lineales múltiples por mínimos cuadrados ordinarios (MCO. Los resultados muestran que la innovación en productos, en procesos y en gestión impacta positivamente el crecimiento del empleo y las ventas, y así mismo a las utilidades. Estos resultados son especialmente relevantes para los países de la AP y pueden ayudar a los empresarios, a los gobiernos y a la academia para impulsar acciones que favorezcan la innovación de las empresas y su competitividad.

  6. Uma avaliação acerca da falha empírica do teorema da paridade descoberta da taxa de juros entre o Real e o Dólar

    Directory of Open Access Journals (Sweden)

    André Cieplinski

    Full Text Available Resumo Este artigo testa a validade do teorema da paridade descoberta de juros para os dados da economia brasileira no período de 2000 a 2014. Nossos resultados corroboram a não validade empírica, conhecida na literatura como de UIP Failure ou Forward Premium Puzzle. O coeficiente do diferencial de juros estimado por um modelo GARCH apresenta sinal negativo, contradizendo parte dos testes da UIP em economias periféricas. Já os modelos markovianos de mudança de regime apontaram para dois padrões bem delimitados: nos períodos de menor volatilidade o coeficiente assume valor negativo e, nos meses de alta volatilidade, valor positivo. Os resultados encontrados são coerentes com a abordagem da taxa de juros exógena em uma economia aberta.

  7. Modelización de costes en los procesos de tratamiento de aguas residuales: un análisis empírico para el caso español

    Directory of Open Access Journals (Sweden)

    Sala Garrido, Ramon

    2006-01-01

    Full Text Available La reutilización de recursos obtenidos de la regeneración de aguas residuales se muestra como una necesidad irrenunciable tanto desde el punto de vista social como ambiental y sanitario. La viabilidad de cualquier proyecto de reutilización requiere un funcionamiento óptimo de los procesos de tratamiento de las aguas residuales. En este sentido resulta necesario un conocimiento exhaustivo de la estructura de costes asociada a cada una de las tecnologías de tratamiento disponibles. En este trabajo se aplica una metodología de modelización de costes mediante el ajuste de una serie de funciones representativas. Se lleva a cabo una aplicación empírica para una muestra de plantas depuradoras de la Comunidad Valenciana.

  8. Parameters of care for craniosynostosis

    DEFF Research Database (Denmark)

    McCarthy, Joseph G; Warren, Stephen M; Bernstein, Joseph

    2012-01-01

    A multidisciplinary meeting was held from March 4 to 6, 2010, in Atlanta, Georgia, entitled "Craniosynostosis: Developing Parameters for Diagnosis, Treatment, and Management." The goal of this meeting was to create parameters of care for individuals with craniosynostosis.......A multidisciplinary meeting was held from March 4 to 6, 2010, in Atlanta, Georgia, entitled "Craniosynostosis: Developing Parameters for Diagnosis, Treatment, and Management." The goal of this meeting was to create parameters of care for individuals with craniosynostosis....

  9. Subsurface Geotechnical Parameters Report

    International Nuclear Information System (INIS)

    Rigby, D.; Mrugala, M.; Shideler, G.; Davidsavor, T.; Leem, J.; Buesch, D.; Sun, Y.; Potyondy, D.; Christianson, M.

    2003-01-01

    The Yucca Mountain Project is entering a the license application (LA) stage in its mission to develop the nation's first underground nuclear waste repository. After a number of years of gathering data related to site characterization, including activities ranging from laboratory and site investigations, to numerical modeling of processes associated with conditions to be encountered in the future repository, the Project is realigning its activities towards the License Application preparation. At the current stage, the major efforts are directed at translating the results of scientific investigations into sets of data needed to support the design, and to fulfill the licensing requirements and the repository design activities. This document addresses the program need to address specific technical questions so that an assessment can be made about the suitability and adequacy of data to license and construct a repository at the Yucca Mountain Site. In July 2002, the U.S. Nuclear Regulatory Commission (NRC) published an Integrated Issue Resolution Status Report (NRC 2002). Included in this report were the Repository Design and Thermal-Mechanical Effects (RDTME) Key Technical Issues (KTI). Geotechnical agreements were formulated to resolve a number of KTI subissues, in particular, RDTME KTIs 3.04, 3.05, 3.07, and 3.19 relate to the physical, thermal and mechanical properties of the host rock (NRC 2002, pp. 2.1.1-28, 2.1.7-10 to 2.1.7-21, A-17, A-18, and A-20). The purpose of the Subsurface Geotechnical Parameters Report is to present an accounting of current geotechnical information that will help resolve KTI subissues and some other project needs. The report analyzes and summarizes available qualified geotechnical data. It evaluates the sufficiency and quality of existing data to support engineering design and performance assessment. In addition, the corroborative data obtained from tests performed by a number of research organizations is presented to reinforce

  10. Subsurface Geotechnical Parameters Report

    Energy Technology Data Exchange (ETDEWEB)

    D. Rigby; M. Mrugala; G. Shideler; T. Davidsavor; J. Leem; D. Buesch; Y. Sun; D. Potyondy; M. Christianson

    2003-12-17

    The Yucca Mountain Project is entering a the license application (LA) stage in its mission to develop the nation's first underground nuclear waste repository. After a number of years of gathering data related to site characterization, including activities ranging from laboratory and site investigations, to numerical modeling of processes associated with conditions to be encountered in the future repository, the Project is realigning its activities towards the License Application preparation. At the current stage, the major efforts are directed at translating the results of scientific investigations into sets of data needed to support the design, and to fulfill the licensing requirements and the repository design activities. This document addresses the program need to address specific technical questions so that an assessment can be made about the suitability and adequacy of data to license and construct a repository at the Yucca Mountain Site. In July 2002, the U.S. Nuclear Regulatory Commission (NRC) published an Integrated Issue Resolution Status Report (NRC 2002). Included in this report were the Repository Design and Thermal-Mechanical Effects (RDTME) Key Technical Issues (KTI). Geotechnical agreements were formulated to resolve a number of KTI subissues, in particular, RDTME KTIs 3.04, 3.05, 3.07, and 3.19 relate to the physical, thermal and mechanical properties of the host rock (NRC 2002, pp. 2.1.1-28, 2.1.7-10 to 2.1.7-21, A-17, A-18, and A-20). The purpose of the Subsurface Geotechnical Parameters Report is to present an accounting of current geotechnical information that will help resolve KTI subissues and some other project needs. The report analyzes and summarizes available qualified geotechnical data. It evaluates the sufficiency and quality of existing data to support engineering design and performance assessment. In addition, the corroborative data obtained from tests performed by a number of research organizations is presented to reinforce

  11. Variables y Modelos Para La Identificación y Predicción Del Fracaso Empresarial: Revisión de La Investigación Empírica Reciente

    Directory of Open Access Journals (Sweden)

    María t. Tascón fernández

    2012-01-01

    Full Text Available Este trabajo analiza la evolución en el tiempo de los estudios sobre fracaso empresarial. Con carácter general, partimos de la revisión crítica realizada en la literatura previa, y aportamos un análisis de la evidencia empírica adicional, con especial atención a la obtenida durante la última década. Pero además, para subsanar algunas deficiencias detectadas en las revisiones anteriores, nos ocupamos de tres aspectos, que pueden considerarse la principal contribución de este trabajo: primero, analizamos la evolución en las últimas décadas del concepto de fracaso empresarial o fallido, detectando cierta evolución desde la identificación hacia la predicción; segundo, analizamos las variables empleadas en los modelos, aportando un estudio de los rasgos empresariales que se representan con las variables (frente al tradicional análisis de frecuencia de las propias variables individuales, siendo los resultados más acordes con los planteamientos y desarrollos teóricos clásicos sobre el fracaso empresarial; y, finalmente, destacamos los puntos fuertes y débiles de las metodologías que, por su reciente aparición, no habían sido analizadas o muy poco por revisiones anteriores: las técnicas de inteligencia artificial y el análisis envolvente de datos (DEA. Adicionalmente, integramos en la revisión el numeroso grupo de trabajos empíricos publicados en España sobre la cuestión, y que no aparecían en ninguna de las revisiones previas analizadas.

  12. Reação do mercado à alavancagem operacional: um estudo empírico no Brasil Reaction of the market to the operational leverage: an empirical study in Brazil

    Directory of Open Access Journals (Sweden)

    José Alves Dantas

    2006-08-01

    Full Text Available Estudos que avaliam o impacto de informações contábeis nas variáveis do mercado de ações têm adquirido grande relevância na literatura contábil e se constituído em instrumento de avaliação da utilidade da informação contábil. O presente estudo segue a mesma lógica das pesquisas lucro-retorno, substituindo a medida de resultados contábeis pela de alavancagem operacional e tendo por base os dados das companhias listadas na Bovespa, dos setores de petróleo e gás, materiais básicos, bens industriais, construção e transporte, consumo não cíclico e consumo cíclico, referentes ao período entre o segundo trimestre de 2001 e o terceiro trimestre de 2004. A premissa considerada é a de que, como a alavancagem operacional, além de incorporar uma dimensão de resultado (o lucro operacional, é uma das determinantes do risco sistemático das ações, e de que há relação entre risco e retorno das ações, é possível inferir uma associação positiva entre o grau de alavancagem operacional e o retorno das ações. Os testes empíricos realizados com a utilização do método de dados em painel apresentam evidências de que a variável alavancagem operacional é estatisticamente relevante para explicar o comportamento do retorno das ações e que essa relação é positiva, conforme previsto teoricamente. Os resultados, também, demonstram que a relevância estatística aumenta quando são adotados parâmetros mais rigorosos para a consideração dos dados e as conclusões não são determinadas pelo comportamento dos valores extremos (outliers. Os testes de raízes unitárias nas séries e de autocorrelação e heteroscedasticidade nos resíduos reforçam a robustez dos resultados apurados.Studies evaluating the impact of financial reporting information on capital market variables have gained great importance in the accounting literature and became a tool for assessing the usefulness of accounting information. The present study

  13. Value or Growth Strategy? Empirical Evidence in BrazilEstratégia de Valor ou de Crescimento? Evidências Empíricas no Brasil¿Estrategia de Valor o de Crecimiento? Evidencias Empíricas en Brasil

    Directory of Open Access Journals (Sweden)

    CORDEIRO, Rebeca Albuquerque

    2013-03-01

    efeito valor-crescimento não se caracteriza no Brasil, uma vez que as evidências empíricas mostraram-se favoráveis às estratégias de crescimento. Em função do longo período estudado, os resultados obtidos podem estar sinalizando o predomínio da estratégia de crescimento no longo prazo. Além disso, ressalta-se a alta volatilidade dos mercados de capitais de países emergentes, conforme destacam Fama e French (1998. Ademais, para estabelecer estratégias de investimento que possibilitem maiores retornos, verificou-se que a variável que melhor identifica as ações de crescimento é o índice book-to-market.RESUMENEste artículo tiene por objetivo verificar la existencia del efecto valor-crecimiento e identificar las variables que explican mejor su impacto sobre el rendimiento de las acciones brasileñas. Para ello, hemos probado las variables book-to-maket, lucro/precio y flujo de caja/precio. Se han aplicado dos enfoques metodológicos: el análisis de la cartera, carteras que se crearon de acuerdo con cada variable de interés y el análisis de regresión con datos de panel sobre la base de activos individuales. La muestra se obtuvo de empresas con acciones negociadas en BM&FBovespa, en el período de 1995 a 2008. De acuerdo con los resultados, las acciones de crecimiento tuvieron un mayor rendimiento que las acciones de valor. Por lo tanto, podemos concluir afirmando que el bien documentado efecto valor-crecimiento no existe en Brasil, ya que la evidencia empírica mostró su apoyo a las estrategias de crecimiento. Debido a que el periodo de tiempo estudiado fue extenso, los resultados pueden indicar el dominio de la estrategia de crecimiento a largo plazo. Por otra parte, destaca la alta volatilidad de los mercados de capitales en los países emergentes, como destacan Fama y French (1998. Además, para establecer estrategias de inversión que permitan una mayor rentabilidad, se deduce que la variable que mejor identifica las acciones de crecimiento es el

  14. WIPP Compliance Certification Application calculations parameters. Part 1: Parameter development

    International Nuclear Information System (INIS)

    Howarth, S.M.

    1997-01-01

    The Waste Isolation Pilot Plant (WIPP) in southeast New Mexico has been studied as a transuranic waste repository for the past 23 years. During this time, an extensive site characterization, design, construction, and experimental program was completed, which provided in-depth understanding of the dominant processes that are most likely to influence the containment of radionuclides for 10,000 years. Nearly 1,500 parameters were developed using information gathered from this program; the parameters were input to numerical models for WIPP Compliance Certification Application (CCA) Performance Assessment (PA) calculations. The CCA probabilistic codes frequently require input values that define a statistical distribution for each parameter. Developing parameter distributions begins with the assignment of an appropriate distribution type, which is dependent on the type, magnitude, and volume of data or information available. The development of the parameter distribution values may require interpretation or statistical analysis of raw data, combining raw data with literature values, scaling of lab or field data to fit code grid mesh sizes, or other transformation. Parameter development and documentation of the development process were very complicated, especially for those parameters based on empirical data; they required the integration of information from Sandia National Laboratories (SNL) code sponsors, parameter task leaders (PTLs), performance assessment analysts (PAAs), and experimental principal investigators (PIs). This paper, Part 1 of two parts, contains a discussion of the parameter development process, roles and responsibilities, and lessons learned. Part 2 will discuss parameter documentation, traceability and retrievability, and lessons learned from related audits and reviews

  15. Improved Estimates of Thermodynamic Parameters

    Science.gov (United States)

    Lawson, D. D.

    1982-01-01

    Techniques refined for estimating heat of vaporization and other parameters from molecular structure. Using parabolic equation with three adjustable parameters, heat of vaporization can be used to estimate boiling point, and vice versa. Boiling points and vapor pressures for some nonpolar liquids were estimated by improved method and compared with previously reported values. Technique for estimating thermodynamic parameters should make it easier for engineers to choose among candidate heat-exchange fluids for thermochemical cycles.

  16. Systematic of delayed neutron parameters

    International Nuclear Information System (INIS)

    Isaev, S.G.; Piksaikin, V.M.

    2000-01-01

    The experimental studies of the energy dependence of the delayed neutron (DN) parameters for various fission systems has shown that the behaviour of a some combination of delayed neutron parameters has a similar features. On the basis of this findings the systematics of delayed neutron experimental data for thorium, uranium, plutonium and americium isotopes have been investigated with the purpose to find a correlation of DN parameters with characteristics of fissioning system as well as a correlation between the delayed neutron parameters themselves. It was presented the preliminary results which were obtained during study the physics interpretation of the results [ru

  17. Parameters in pure type systems

    NARCIS (Netherlands)

    Bloo, C.J.; Kamareddine, F.; Laan, T.D.L.; Nederpelt, R.P.; Rajsbaum, S.

    2002-01-01

    In this paper we study the addition of parameters to typed ¿-calculus with definitions. We show that the resulting systems have nice properties and illustrate that parameters allow for a better fine-tuning of the strength of type systems as well as staying closer to type systems used in practice in

  18. ACTIVATION PARAMETERS AND EXCESS THERMODYANAMIC ...

    African Journals Online (AJOL)

    Applying these data, viscosity-B-coefficients, activation parameters (Δμ10≠) and (Δμ20≠) and excess thermodynamic functions, viz., excess molar volume (VE), excess viscosity, ηE and excess molar free energy of activation of flow, (GE) were calculated. The value of interaction parameter, d, of Grunberg and Nissan ...

  19. HF Parameters of Induction Motor

    Directory of Open Access Journals (Sweden)

    M. N. Benallal

    2017-09-01

    Full Text Available This article describes the results of experimental studies of HF input and primary parameters. A simulation model in Matlab SimulinkTM of multiphase windings as ladder circuit of coils is developed. A method for determining the primary parameters of ladder equivalent circuits is presented.

  20. Generating three-parameter sensor

    Directory of Open Access Journals (Sweden)

    Filinyuk M. A.

    2014-08-01

    Full Text Available Generating sensors provide the possibility of getting remote information and its easy conversion into digital form. Typically, these are one-parameter sensors formed by combination of a primary transmitter (PT and a sine wave generator. Two-parameter sensors are not widely used as their implementation causes a problem with ambiguity output when measuring the PT. Nevertheless, the problem of creating miniature, thrifty multi-parameter RF sensors for different branches of science and industry remains relevant. Considering ways of designing RF sensors, we study the possibility of constructing a three-parameter microwave radio frequency range sensor, which is based on a two-stage three-parameter generalized immitance convertor (GIC. Resistive, inductive and capacitive PT are used as sensing elements. A mathematical model of the sensor, which describes the relation of the sensor parameters to the parameters of GIC and PT was developed. The basic parameters of the sensor, its transfer function and sensitivity were studied. It is shown that the maximum value of the power generated signal will be observed at a frequency of 175 MHz, and the frequency ranges depending on the parameters of the PT will be different. Research results and adequacy of the mathematical model were verified by the experiment. Error of the calculated dependences of the lasing frequency on PT parameters change, compared with the experimental data does not exceed 2 %. The relative sensitivity of the sensor based on two-stage GIC showed that for the resistive channel it is about 1.88, for the capacitive channel –1,54 and for the inductive channel –11,5. Thus, it becomes possible to increase the sensor sensitivity compared with the sensitivity of the PT almost 1,2—2 times, and by using the two stage GIC a multifunctional sensor is provided.

  1. Aspectos conceptuales y empíricos de la financiación de nuevas empresas en Colombia Conceptual and empirical aspects of the financing of new companies in Colombia

    Directory of Open Access Journals (Sweden)

    Bernardo Barona Zuluaga

    2010-06-01

    Full Text Available Este artículo presenta los resultados de una investigación empírica sobre la utilización de diferentes fuentes de financiación por parte de empresas nuevas en los primeros anos de vida. El principal soporte conceptual del estudio es el paradigma del ciclo de crecimiento financiero desarrollado por Berger y Udell (1998, el cual explica satisfactoriamente los hallazgos encontrados en el componente empírico del estudio aquí presentado, que se basa en una encuesta realizada a 130 empresarios de la Ciudad de Cali (Colombia. Los entrevistados reportaron de manera mayoritaria el uso de recursos propios y de familiares y amigos y la retención de utilidades en los primeros anos de vida de una empresa. Le sigue en importancia a estas fuentes, la financiación provista por establecimientos de crédito; llama la atención la importancia relativa del leasing. Las recomendaciones mas importantes incluyen: fortalecer las fuentes de capital semilla, darle mayor peso en los cursos de finanzas de nivel universitario al estudio de los problemas de las empresas nuevas y MIPYMES, adelantar una reforma financiera que facilite la emisión de acciones y mejorar la cantidad y calidad de información pública disponible sobre la financiación de las empresas objeto de este estudio.This article presents the results of an empirical research on the type of financial resources used by a sample of new enterprises in their early years of life. The main conceptual support of the study is the financial growth cycle paradigm developed by Berger and Udell (1998. This paradigm successfully explains the findings in the empirical component of the study presented here, which is based on a survey of 130 entrepreneurs in the city of Cali, Colombia. The survey results highlighted the importance of the use of financial resources provided by the owner and theirs family and friends, and of the retention of profits in their companies in the early years. Next in importance is the

  2. La Medicion de la Productividad del Valor Agregado: una aplicación empírica en una cooperativa agroalimentaria de Costa Rica (Measuring value added productivity: an empirical aplication in an agroalimentary cooperative in Costa Rica

    Directory of Open Access Journals (Sweden)

    Cristina Morales Sandoval

    2014-09-01

    Full Text Available La medición de la productividad a nivel de las empresas, así como de las cadenas productivas, resulta ser una condición necesaria para la evaluación de su desempeño, la innovación y la definición de sus estrategias empresariales. La productividad se ha vuelto un tema fundamental en las empresas, ya que una alta productividad y una adecuada estrategia permiten el aumento de la competitividad e innovación en las empresas, debido a que su incremento representa un elemento diferenciador para alcanzar el éxito a nivel nacional e internacional. Este trabajo tiene como objetivo aportar evidencia empírica acerca de la aplicación de un modelo que da respuesta sobre la evaluación del desempeño, la innovación y la estrategia, el cual es denominado “Medición de la productividad del valor agregado” (MPVA, que fue aplicado en una cooperativa agroalimentaria costarricense COOPEBRISAS R.L. como prueba empírica en el análisis del cálculo del valor agregado, cálculo de indicadores de productividad y el análisis de los índices, evaluando los periodos entre el año 2008 y el 2012. Dentro de los resultados de la investigación se destaca que el MPVA permitió cuantificar el desempeño de la cooperativa, al identificar áreas problemáticas y prioritarias para aumentar su posición en el mercado y su productividad.   Abstract A necessary requirement for evaluating the performance, innovation and the definition of company strategy is the measuring of productivity of companies and productive chains. Productivity has become fundamental for companies since high productivity and adequate strategies favors an increase in company competitiveness and innovation that in turn creates a distinguishing element for attaining success at national and international levels. This research aims to provide empirical evidence about the application of a model that evaluates performance, innovation and strategy, called “Value Added Productivity Measurement

  3. Encuadre normativo y empírico para un diagnóstico del trabajo infantil en México (Normative and empirical framework for a diagnose of child labour in Mexico

    Directory of Open Access Journals (Sweden)

    Mónica González Contró

    2012-05-01

    Full Text Available This paper seeks to diagnose the phenomenon of children and adolescent labour in Mexico from the legal and empirical perspective, while expecting to make visible underlying, persistent and oftenly hidden realities. With this framework, we present a general path concerning some legal instruments that allow us to define and categorize the studied phenomenon, and we carry out an empirical analysis from a series of indicators developed in the Module of child labour included in the National Survey of Occupation and Employment raised by National Institute of Statistics and Geography (Instituto Nacional de Estadística y Geografía, INEGI in 2009. Information and analyzed data allow us to conclude in a broad manner that the constitutional and legal prohibition to child labour has not fulfill its eradication, further more, not starting from the approach of rights has implied a position of more vulnerability to underage persons who work due to several circumstances, whether economical, social or cultural. En este trabajo se busca realizar una aproximación diagnóstica al fenómeno del trabajo infantil y adolescente en México con miras a visibilizar aspectos que han estado invisibilizados a lo largo del tiempo, desde la perspectiva legal y empírica. En este marco, se hace un recorrido general de algunos instrumentos legales que permiten definir y categorizar el fenómeno, y se realiza un análisis empírico a partir de una serie de indicadores surgidos del Módulo de Trabajo Infantil incluido en la Encuesta Nacional de Ocupación y Empleo levantada por el Instituto Nacional de Estadística y Geografía en el año 2009. La información manejada, así como los datos analizados permiten concluir de manera general que la prohibición constitucional y legal del trabajo infantil no ha conseguido su erradicación, y el no partir de un enfoque de derechos colocaría en una posición de mayor vulnerabilidad a las personas menores de edad que trabajan por

  4. Magnetic Source Regions of Coronal Mass Ejections Brigitte ...

    Indian Academy of Sciences (India)

    2003) or two rows of opposite polarity field extending to ... sional Alfvén waves which bring up helicity from the sub-photospheric part of the flux tube ... Figure 1. Loss of equilibrium model: sketches of coronal field lines showing ... lines of the quadrupolar reconnection before the flare, (bottom left): TRACE observations of the.

  5. Dry Deposition from Sahara Sources Regions of Western Africa

    Directory of Open Access Journals (Sweden)

    B. Douaiba

    2014-01-01

    Full Text Available Sahara dust storms during March 2004 have attracted much attention from the dust-research community due to their intensity, wide coverage, and endurance. In the present work, the dry deposition mechanisms of mineral dust are analysed during an event on the 3 March 2004 over the Northwest African coast. This particular case was chosen based on the strong dry removal that occurred, rendering it ideal for examining the deposition processes. The simulation of synoptic conditions and dry deposition of four dust particles including clay, small silt, large silt, and sand was performed with Eta model, coupled with a desert dust cycle module. The results have been compared with surface data from weather stations in North Africa, data of dry metals from stations located in Gran Canaria, and various satellite images such as European Organization for the Exploitation of Meteorological Satellites and Moderate Resolution Imaging Spectroradiometer for the period in question.

  6. Auroral kilometric radiation source region observations from ISIS 1

    International Nuclear Information System (INIS)

    Benson, R.F.

    1981-01-01

    The ISIS 1 observations of the high-frequency portion of the auroral kilometric radiation (AKR) spectrum are considered, that is, from the minimum frequency encountered for the extraordinary mode cut-off (approximately 450 kHz) to the upper frequency cut-off (approximately 800 kHz). AKR is found to be generated in the extraordinary mode just above the local cutoff frequency and to emanate in a direction that is nearly perpendicular to the magnetic field. It occurs within local depletions of electron density, where the ratio of plasma frequency to cyclotron frequency is below 0.2. The density depletion is restricted to altitudes above approximately 2,000 km, and the upper AKR frequency limit corresponds to the extraordinary cutoff frequency at this altitude

  7. Comparison of Parameter Identification Techniques

    Directory of Open Access Journals (Sweden)

    Eder Rafael

    2016-01-01

    Full Text Available Model-based control of mechatronic systems requires excellent knowledge about the physical behavior of each component. For several types of components of a system, e.g. mechanical or electrical ones, the dynamic behavior can be described by means of a mathematic model consisting of a set of differential equations, difference equations and/or algebraic constraint equations. The knowledge of a realistic mathematic model and its parameter values is essential to represent the behaviour of a mechatronic system. Frequently it is hard or impossible to obtain all required values of the model parameters from the producer, so an appropriate parameter estimation technique is required to compute missing parameters. A manifold of parameter identification techniques can be found in the literature, but their suitability depends on the mathematic model. Previous work dealt with the automatic assembly of mathematical models of serial and parallel robots with drives and controllers within the dynamic multibody simulation code HOTINT as fully-fledged mechatronic simulation. Several parameters of such robot models were identified successfully by our embedded algorithm. The present work proposes an improved version of the identification algorithm with higher performance. The quality of the identified parameter values and the computation effort are compared with another standard technique.

  8. Telemetry System of Biological Parameters

    Directory of Open Access Journals (Sweden)

    Jan Spisak

    2005-01-01

    Full Text Available The mobile telemetry system of biological parameters serves for reading and wireless data transfer of measured values of selected biological parameters to an outlying computer. It concerns basically long time monitoring of vital function of car pilot.The goal of this projects is to propose mobile telemetry system for reading, wireless transfer and processing of biological parameters of car pilot during physical and psychical stress. It has to be made with respect to minimal consumption, weight and maximal device mobility. This system has to eliminate signal noise, which is created by biological artifacts and disturbances during the data transfer.

  9. Biotropic parameters of magnetic fields

    Energy Technology Data Exchange (ETDEWEB)

    Shishlo, M.A.

    The use of magnetic fields (MF) in biology and medicine to control biological systems has led to appearance of the term, biotropic parameters of MF. They include the physical characteristics of MF, which determine the primary biologically significant physicochemical mechanisms of field action causing formation of corresponding reactions on the level of the integral organism. These parameters include MF intensity, gradient, vector, pulse frequency and shape, and duration of exposure. Factors that elicit responses by the biological system include such parameter of MF interaction with the integral organism as localization of exposure and volume of tissues interacting with the field, as well as the initial state of the organism. In essence, the findings of experimental studies of biotropic parameters of MF make it possible to control physiological processes and will aid in optimizing methods of MF therapy.

  10. Parameters of care for craniosynostosis

    DEFF Research Database (Denmark)

    Vargervik, Karin; Rubin, Marcie S; Grayson, Barry H

    2012-01-01

    A multidisciplinary conference was convened in March 2010 with the charge to develop parameters of care for patients with craniosynostosis. The 52 participants represented 16 medical specialties and 16 professional societies. Herein, we present the dental, orthodontic, and surgical care...

  11. Real-Time Parameter Identification

    Data.gov (United States)

    National Aeronautics and Space Administration — Armstrong researchers have implemented in the control room a technique for estimating in real time the aerodynamic parameters that describe the stability and control...

  12. THE HAEMORHEOLOGICAL PARAMETERS OF HYPERTENSIVE ...

    African Journals Online (AJOL)

    admin

    ) and. Whole Blood Relative Viscosity (WBRV) were determined by capillary viscometry as described by Reid and Ugwu (1987) and recently modified by Korubo-Owiye et al. (1997). All haemorheological parameters were analyzed within 2 ...

  13. Material parameters for thermoelectric performance

    Indian Academy of Sciences (India)

    The thermoelectric performance of a thermoelement is ideally defined in terms of the so-called ... However, there are other parameters which are fairly good indicators ... Whereas a final deciding factor reflecting on .... matter of a future work.

  14. Inflation and cosmological parameter estimation

    Energy Technology Data Exchange (ETDEWEB)

    Hamann, J.

    2007-05-15

    In this work, we focus on two aspects of cosmological data analysis: inference of parameter values and the search for new effects in the inflationary sector. Constraints on cosmological parameters are commonly derived under the assumption of a minimal model. We point out that this procedure systematically underestimates errors and possibly biases estimates, due to overly restrictive assumptions. In a more conservative approach, we analyse cosmological data using a more general eleven-parameter model. We find that regions of the parameter space that were previously thought ruled out are still compatible with the data; the bounds on individual parameters are relaxed by up to a factor of two, compared to the results for the minimal six-parameter model. Moreover, we analyse a class of inflation models, in which the slow roll conditions are briefly violated, due to a step in the potential. We show that the presence of a step generically leads to an oscillating spectrum and perform a fit to CMB and galaxy clustering data. We do not find conclusive evidence for a step in the potential and derive strong bounds on quantities that parameterise the step. (orig.)

  15. Reduction of robot base parameters

    Energy Technology Data Exchange (ETDEWEB)

    Vandanjon, P O [CEA Centre d` Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Procedes et Systemes Avances; Gautier, M [Nantes Univ., 44 (France)

    1996-12-31

    This paper is a new step in the search of minimum dynamic parameters of robots. In spite of planing exciting trajectories and using base parameters, some parameters remain not identifiable due to the perturbation effects. In this paper, we propose methods to reduce the set of base parameters in order to get an essential set of parameters. This new set defines a simplified identification model witch improves the noise immunity of the estimation process. It contributes also in reducing the computation burden of a simplified dynamic model. Different methods are proposed and are classified in two parts: methods, witch perform reduction and identification together, come from statistical field and methods, witch reduces the model before the identification thanks to a priori information, come from numerical field like the QR factorization. Statistical tools and QR reduction are shown to be efficient and adapted to determine the essential parameters. They can be applied to open-loop, or graph structured rigid robot, as well as flexible-link robot. Application for the PUMA 560 robot is given. (authors). 9 refs., 4 tabs.

  16. Reduction of robot base parameters

    International Nuclear Information System (INIS)

    Vandanjon, P.O.

    1995-01-01

    This paper is a new step in the search of minimum dynamic parameters of robots. In spite of planing exciting trajectories and using base parameters, some parameters remain not identifiable due to the perturbation effects. In this paper, we propose methods to reduce the set of base parameters in order to get an essential set of parameters. This new set defines a simplified identification model witch improves the noise immunity of the estimation process. It contributes also in reducing the computation burden of a simplified dynamic model. Different methods are proposed and are classified in two parts: methods, witch perform reduction and identification together, come from statistical field and methods, witch reduces the model before the identification thanks to a priori information, come from numerical field like the QR factorization. Statistical tools and QR reduction are shown to be efficient and adapted to determine the essential parameters. They can be applied to open-loop, or graph structured rigid robot, as well as flexible-link robot. Application for the PUMA 560 robot is given. (authors). 9 refs., 4 tabs

  17. Análisis estocástico de señales vibratorias de motores de inducción para la detección de fallas usando descomposición de modo empírico

    Directory of Open Access Journals (Sweden)

    Alejandro Rivera Roldán

    2015-04-01

    Full Text Available En este artículo se presenta un análisis de vibraciones en motores de inducción por medio de Modelos Ocultos de Markov (Hidden Markov Model - HMM aplicado a características obtenidas de la Descomposición de Modo Empírico (Empirical Mode Decomposition - EMD y transformada de Hilbert-Huang de señales de vibración obtenidas en las coordenadas x y y, con el fin de detectar fallas de funcionamiento en rodamientos y barras.  Además se presenta un análisis comparativo de la capacidad de las señales de vibración en dirección x y en dirección y, para aportar información en la detección de fallas. Así, un HMM ergódico inicializado y entrenado por medio del algoritmo de máxima esperanza, con convergencia en 10e-7 y un máximo de iteraciones de 100, se aplicó sobre el espacio de características y su desempeño fue determinado mediante validación cruzada 80-20 con 30 fold, obteniendo un alto desempeño para la detección de fallas en términos de exactitud.

  18. Vulnerabilidad frente al cambio climático en la Región Metropolitana de Santiago de Chile: posiciones teóricas versus evidencias empíricas

    Directory of Open Access Journals (Sweden)

    Juliane Welz

    2016-01-01

    Full Text Available Para la Región Metropolitana de Santiago de Chile (RMS, el cambio climático implica diferentes impactos que se suman a la continua expansión urbana y a cambios en los patrones de uso del suelo, los cuales a su vez acrecientan las amenazas hidroclimáticas, como las inundaciones y el calor extremo. En general, estos cambios tendrán notables consecuencias para la vulnerabilidad residencial. Especialmente las familias de bajos recursos y los asentamientos ilegales en grandes ciudades con crecimiento acelerado suelen ser los más vulnerables, debido a una mayor exposición y a una limitada capacidad de respuesta. Este artículo contrasta posiciones teóricas sobre las dimensiones socioeconómicas, físico-constructivas y urbano-rurales de la vulnerabilidad con evidencias empíricas, para entender quiénes son los más afectados por las inundaciones y el calor extremo en la Rms. Como muestran los resultados del estudio, las posiciones teóricas no se reflejan en los análisis cuantitativos. La vulnerabilidad depende de cada contexto y requiere políticas adecuadas para distintos territorios.

  19. TIC, cualificación, organización y productividad del trabajo: un análisis empírico sobre las nuevas fuentes de la eficiencia empresarial en Cataluña

    Directory of Open Access Journals (Sweden)

    Joan Torrent-Sellens

    2011-01-01

    Full Text Available A partir de los datos para una muestra representativa del tejido productivo privado en Cataluña (1.283 empresas y en sintonía con la evidencia empírica internacional, en este trabajo se analizan las nuevas fuentes co-innovadoras (usos TIC, nuevas formas de organización y cualificación del trabajo de la productividad empresarial. Los resultados obtenidos nos han permitido identificar un patrón competitivo caracterizado por la decisiva contribución del capital físico productivo. Además, una segmentación del tejido empresarial nos sugiere la existencia de dos patrones competitivos claramente diferenciados. En las empresas intensivas en el uso de la tecnología y el conocimiento (alrededor de una quinta parte del total, la explicación de su nivel de productividad se basa en el capital físico productivo, los nuevos conjuntos de prácticas de organización del trabajo y las complementariedades entre éstas y el uso de las TIC. Por el contrario, en la gran mayoría de empresas catalanas (el 80% restante que no usa intensivamente la tecnología y el conocimiento no se ha encontrado evidencia que corrobore la existencia de nuevas fuentes co-innovadoras en la explicación de su potencial de crecimiento a largo plazo.

  20. Efectos de la estrategia y la posición tecnológica en el rendimiento de la PYME manufacturera. Un estudio empírico en empresas mexicanas

    Directory of Open Access Journals (Sweden)

    Alicia Gómez Martínez

    2013-02-01

    Full Text Available Son dos los objetivos de este trabajo; a es identificar las estrategias competitivas y la posición tecnológica que utilizan la PYME de los estados de Puebla y Yucatán; y b realizar un análisis comparativo para conocer si el tipo de estrategias y posición tecnológica utilizada por la PYME industrial de dichos estados influyen en su rendimiento. En un estudio empírico, se comparan dos muestras representativas: 136 PYME poblanas y 169 yucatecas. Los resultados indican que el tipo de estrategia exploradora-analizadora es la que mayormente se usa en ambos estados y que son este tipo de empresas aquellas que tienen mayor rendimiento. También se comprobó que las empresas con posición tecnológica Fuerte- Buena tienen mayor rendimiento que aquellas que tienen posición tecnológica Sostenible-Débil.

  1. Adaptación al Español de la Escala de Desempeño Cívico de Coleman y Borman (2000 y Análisis de la Estructura Empírica del Constructo

    Directory of Open Access Journals (Sweden)

    Luis Díaz-Vilela

    2012-01-01

    Full Text Available Este artículo presenta una adaptación del cuestionario de desempeño cívico de Coleman y Borman (2000 y un análisis de su estructura empírica. Una vez traducido y adaptado, el cuestionario se aplicó a una muestra de 135 empleados públicos de una unidad completa del Gobierno Autonómico de Canarias. Los resultados indican que el cuestionario tiene una alta consistencia interna, aunque parece medir tres dimensiones relacionadas entre sí. Dos de estas dimensiones son altamente estables y coinciden con las propuestas por LePine, Erez y Johnson (2002, Cumplimiento Generalizado y Altruismo, mientras que la tercera es de difícil interpretación. Un análisis factorial de segundo orden indica que existe una única dimensión subyacente de desempeño cívico. Estos resultados tienen implicaciones teóricas y prácticas que ayudan a la interpretación y diagnóstico del dominio.

  2. Una aproximación empírica a la relación entre el desempleo y las vacantes para Popayán, 2001-2005

    Directory of Open Access Journals (Sweden)

    Jhon James Mora

    2006-12-01

    Full Text Available Este artículo presenta evidencia empírica sobre la relación entre las vacantes y el desempleo, a través de la Curva de Beveridge, para la ciudad de Popayán entre 2001 y 2005, siguiendo un modelo de datos de panel por áreas de desempeño. Los resultados del modelo muestran que la elasticidad del desempleo con respecto a las vacantes es estadísticamente significativa y positiva. Este resultado puede deberse a la existencia de shocks asimétricos en los distintos sectores de la economía payanés, que se estarían reflejando en la dinámica de las áreas de desempeño laboral. De esta forma, se estaría presentando una recomposición de las actividades económicas de la ciudad de Popayán durante el período estudiado.

  3. Comparação Entre Os Modelos Residual Income Valuation (RIV, Abnormal Earnings Growth (AEG e Fluxo de Caixa Livre (FCF: Um estudo empírico no mercado de capitais brasileiro

    Directory of Open Access Journals (Sweden)

    Eric Serrano Ferreira

    2008-01-01

    Full Text Available O objetivo deste estudo foi comparar os modelos Residual Income Valuation (RIV, Abnormal Earnings Growth (AEG e Fluxo de Caixa Livre (FCF no mercado brasileiro. Fez-se um teste empírico para comparar os três modelos, utilizando dados das empresas listadas na BOVESPA e testando a afirmação para o mercado de capitais brasileiro. Cada modelo foi analisado por meio da técnica estatística de regressão múltipla, anualmente, observando assim o comportamento dos modelos ao longo dos anos de 1995 a 2002. Ao serem realizados os testes, pode-se concluir que, de 1995 à 1999, o modelo RIV possuía poder explicativo superior aos outros dois modelos e a partir de 2000, os modelos AEG e RIV se equivalem, ilustrando o desenvolvimento do mercado brasileiro nos últimos anos. O modelo FCF apresentou o menor poder explicativo em todos os anos analisados. Os resultados encontrados se confirmaram por meio da análise de dados em painel.

  4. Poder de mercado no segmento de distribuição de gasolina C: uma análise a partir da Nova Organização Industrial Empírica

    Directory of Open Access Journals (Sweden)

    Rosangela Aparecida Soares Fernandes

    2013-09-01

    Full Text Available Este artigo tem como objetivo avaliar o grau de poder de mercado no setor de distribuição de gasolina C, nas regiões brasileiras, no período de 2002 a 2008. Para tal, baseou-se na Teoria da Nova Organização Industrial Empírica (NOIE, especificamente, no modelo proposto por Bresnahan (1982 e Lau (1982. Uma versão dinâmica do modelo também foi estimada. Os resultados indicaram que, exceto para a região Norte, para o modelo estático, as empresas distribuidoras de gasolina C não agem como tomadoras de preços (Λ = 0. No outro extremo, a hipótese de conluio perfeito (Λ = 1 entre elas foi rejeitada. Verificou-se que, em várias regiões, os parâmetros revelaram-se suficientemente baixos, sugerindo que as empresas distribuidoras apresentam elevada competição entre si.

  5. Modelo Empírico, Descriptivo y Predictivo Para el Compromiso de Identidad en el Chat en Adolescentes Escolares Chilenos Empirical, Descriptive and Predictive Model for Identity Involvement in Chat use by Chilean School Adolescents

    Directory of Open Access Journals (Sweden)

    María Paz Altuzarra

    2007-11-01

    Full Text Available Se desarrolla un modelo empírico, descriptivo y predictivo de regresión múltiple de las relaciones entre compromiso de identidad en el Chat y salud mental, sexo, curso y tipo de Chat en una muestra de 385 alumnos de ambos sexos, de I, II, III y IV Medio de tres colegios de Santiago de Chile. Se aplicó un cuestionario sobre uso de Internet, Escala de Compromiso de Identidad en el Chat y Cuestionario de Salud Mental en la Edad Juvenil. Se encontró que tanto la salud mental como el tipo de Chat predecían el compromiso de la identidad en el Chat. Se observó un mayor compromiso entre jóvenes mujeres de I y II Medio y que empleaban Chat abierto o mixto.An empirical descriptive and predictive model of multiple regression on the relationships between identity involvement in the Chat and mental health, sex, grade and modality of Chat in a sample of 385 male and female high school students, from Santiago de Chile, is presented. The instruments used were: a questionnaire about Internet usage, an Identity Compromise Scale in the Chat and a Youth Mental Health Scale. Results indicate that both, mental health and type of Chat, predicted compromise of identity in the Chat. It was observed a greater compromise among female teenagers from 9th and 10th grade who used open and mixed Chat.

  6. Uma análise empírica da volatilidade do retorno de commodities agrícolas utilizando modelos ARCH: os casos do café e da soja

    Directory of Open Access Journals (Sweden)

    Washington Santos da Silva

    2005-03-01

    Full Text Available Examinou-se o processo da volatilidade dos retornos de duas importantes commodities agrícolas brasileiras, o café e a soja, por meio de modelos da classe ARCH. Os resultados empíricos sugerem fortes sinais de persistência e assimetria na volatilidade de ambas as séries. Além disso, os resultados sugerem que a implementação de políticas que criem, facilitem o acesso e estimulem a utilização de instrumentos de hedging baseados no mercado podem ser estratégias adequadas para tais setores diante da persistência de choques e volatilidade pronunciadas constatadas para os retornos destas commoditiesWe examined the volatility process of the returns of two important Brazilian agricultural commodities, coffee and soy, using ARCH class models. Empirical results suggest strong signs of persistence and asymmetry in the volatility of both series. Furthermore, the results suggest that the design of policies that create, facilitate the access and stimulate the use of market-based hedging devices can be proper strategies for such sectors in view of the persistence of shocks and the pronounced volatility found for the returns of these commodities.

  7. Free flight in parameter space

    DEFF Research Database (Denmark)

    Dahlstedt, Palle; Nilsson, Per Anders

    2008-01-01

    with continuous interpolation between population members. With a suitable sound engine, the system forms a surprisingly expressive performance instrument, used by the electronic free impro duo pantoMorf in concerts and recording sessions over the last year.......The well-known difficulty of controlling many synthesis parameters in performance, for exploration and expression, is addressed. Inspired by interactive evolution, random vectors in parameter space are assigned to an array of pressure sensitive pads. Vectors are scaled with pressure and added...... to define the current point in parameter space. Vectors can be scaled globally, allowing exploration of the whole space or minute timberal expression. The vector origin can be shifted at any time, allowing exploration of subspaces. In essence, this amounts to mutation-based interactive evolution...

  8. Hecke algebras with unequal parameters

    CERN Document Server

    Lusztig, G

    2003-01-01

    Hecke algebras arise in representation theory as endomorphism algebras of induced representations. One of the most important classes of Hecke algebras is related to representations of reductive algebraic groups over p-adic or finite fields. In 1979, in the simplest (equal parameter) case of such Hecke algebras, Kazhdan and Lusztig discovered a particular basis (the KL-basis) in a Hecke algebra, which is very important in studying relations between representation theory and geometry of the corresponding flag varieties. It turned out that the elements of the KL-basis also possess very interesting combinatorial properties. In the present book, the author extends the theory of the KL-basis to a more general class of Hecke algebras, the so-called algebras with unequal parameters. In particular, he formulates conjectures describing the properties of Hecke algebras with unequal parameters and presents examples verifying these conjectures in particular cases. Written in the author's precise style, the book gives rese...

  9. Catalogue of HI PArameters (CHIPA)

    Science.gov (United States)

    Saponara, J.; Benaglia, P.; Koribalski, B.; Andruchow, I.

    2015-08-01

    The catalogue of HI parameters of galaxies HI (CHIPA) is the natural continuation of the compilation by M.C. Martin in 1998. CHIPA provides the most important parameters of nearby galaxies derived from observations of the neutral Hydrogen line. The catalogue contains information of 1400 galaxies across the sky and different morphological types. Parameters like the optical diameter of the galaxy, the blue magnitude, the distance, morphological type, HI extension are listed among others. Maps of the HI distribution, velocity and velocity dispersion can also be display for some cases. The main objective of this catalogue is to facilitate the bibliographic queries, through searching in a database accessible from the internet that will be available in 2015 (the website is under construction). The database was built using the open source `` mysql (SQL, Structured Query Language, management system relational database) '', while the website was built with ''HTML (Hypertext Markup Language)'' and ''PHP (Hypertext Preprocessor)''.

  10. Parameter estimation and inverse problems

    CERN Document Server

    Aster, Richard C; Thurber, Clifford H

    2005-01-01

    Parameter Estimation and Inverse Problems primarily serves as a textbook for advanced undergraduate and introductory graduate courses. Class notes have been developed and reside on the World Wide Web for faciliting use and feedback by teaching colleagues. The authors'' treatment promotes an understanding of fundamental and practical issus associated with parameter fitting and inverse problems including basic theory of inverse problems, statistical issues, computational issues, and an understanding of how to analyze the success and limitations of solutions to these probles. The text is also a practical resource for general students and professional researchers, where techniques and concepts can be readily picked up on a chapter-by-chapter basis.Parameter Estimation and Inverse Problems is structured around a course at New Mexico Tech and is designed to be accessible to typical graduate students in the physical sciences who may not have an extensive mathematical background. It is accompanied by a Web site that...

  11. The ASDEX Upgrade Parameter Server

    Energy Technology Data Exchange (ETDEWEB)

    Neu, Gregor, E-mail: gregor.neu@ipp.mpg.de [Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching (Germany); Cole, Richard [Unlimited Computer Systems, Seeshaupter Str. 15, 82393 Iffeldorf (Germany); Gräter, Alex [Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching (Germany); Lüddecke, Klaus [Unlimited Computer Systems, Seeshaupter Str. 15, 82393 Iffeldorf (Germany); Rapson, Christopher J.; Raupp, Gerhard; Treutterer, Wolfgang; Zasche, Dietrich; Zehetbauer, Thomas [Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching (Germany)

    2015-10-15

    Highlights: • We describe our main tool in the plasma control configuration process. • Parameter access and computation are configurable with XML files. • Simple implementation of in situ tests by rerouting requests to test data. • Pulse specific overriding of parameters. - Abstract: Concepts for the configuration of plant systems and plasma control of modern devices such as ITER and W7-X are based on global data structures, or “pulse schedules” or “experiment programs”, which specify all physics characteristics (waveforms for controlled actuators and plasma quantities) and all technical characteristics of the plant systems (diagnostics and actuators operation settings) for a planned pulse. At ASDEX Upgrade we use different approach. We observed that the physics characteristics driving the discharge control system (DCS) are frequently modified on a pulse-to-pulse basis. Plant system operation, however, relies on technical standard settings, or “basic configurations” to provide guaranteed resources or services, which evolve according to longer term session or campaign operation schedules. This is why AUG manages technical configuration items separately from physics items. Consistent computation of the DCS configuration requires access to all this physics and technical data, which include the discharge programme (DP), settings of actuator systems and real-time diagnostics, the current system state and a database of static parameters. A Parameter Server provides a unified view on all these parameter sets and acts as the central point of access. We describe the functionality and architecture of the Parameter Server and its embedding into the control environment.

  12. Measuring the Michel parameter ξ''

    International Nuclear Information System (INIS)

    Knowles, P.; Deutsch, J.; Egger, J.; Fetscher, W.; Foroughi, F.; Govaerts, J.; Hadri, M.; Kirch, K.; Kistryn, S.; Lang, J.; Morelle, X.; Naviliat, O.; Ninane, A.; Prieels, R.; Severijns, N.; Simons, L.; Sromicki, J.; Vandormael, S.; Hove, P. van

    1999-01-01

    Unlike the majority of Michel parameters which are consistent with the Standard Model V-A interaction, the experimental value of ξ''(=0.65±0.36) [1] is poorly known. Our experiment will measure the longitudinal polarization, P L , of positrons emitted from the decay of polarized muons. The value of P L , equal to unity in the Standard Model, will decrease for high energy positrons emitted antiparallel to the muon spin if the combination of Michel parameters ξ''/ξξ' - 1 deviates from the Standard Model value of zero

  13. Debris-flows scale predictions based on basin spatial parameters calculated from Remote Sensing images in Wenchuan earthquake area

    International Nuclear Information System (INIS)

    Zhang, Huaizhen; Chi, Tianhe; Liu, Tianyue; Wang, Wei; Yang, Lina; Zhao, Yuan; Shao, Jing; Yao, Xiaojing; Fan, Jianrong

    2014-01-01

    Debris flow is a common hazard in the Wenchuan earthquake area. Collapse and Landslide Regions (CLR), caused by earthquakes, could be located from Remote Sensing images. CLR are the direct material source regions for debris flow. The Spatial Distribution of Collapse and Landslide Regions (SDCLR) strongly impact debris-flow formation. In order to depict SDCLR, we referred to Strahler's Hypsometric analysis method and developed 3 functional models to depict SDCLR quantitatively. These models mainly depict SDCLR relative to altitude, basin mouth and main gullies of debris flow. We used the integral of functions as the spatial parameters of SDCLR and these parameters were employed during the process of debris-flows scale predictions. Grouping-occurring debris-flows triggered by the rainstorm, which occurred on September 24th 2008 in Beichuan County, Sichuan province China, were selected to build the empirical equations for debris-flows scale predictions. Given the existing data, only debris-flows runout zone parameters (Max. runout distance L and Lateral width B) were estimated in this paper. The results indicate that the predicted results were more accurate when the spatial parameters were used. Accordingly, we suggest spatial parameters of SDCLR should be considered in the process of debris-flows scale prediction and proposed several strategies to prevent debris flow in the future

  14. PUSPATI Triga Reactor pulsing parameters

    Energy Technology Data Exchange (ETDEWEB)

    Auu, Gui Ah; Abu, Puad Haji; Yunus, Yaziz [PUSPATI, Selangor (Malaysia)

    1984-06-01

    The pulsing experiment was carried out as part of the commissioning activites of PUSPATI TRIGA Reactor (PTR). Several parameters of PTR were deduced from the experiment. It was found that the maximum temperature of the fuel was far below the safety limit when the maximum allowable positive reactivity of $3.00 was inserted into the core. The peak power achieved was 1354 Mw.

  15. Parameter setting and input reduction

    NARCIS (Netherlands)

    Evers, A.; van Kampen, N.J.|info:eu-repo/dai/nl/126439737

    2008-01-01

    The language acquisition procedure identifies certain properties of the target grammar before others. The evidence from the input is processed in a stepwise order. Section 1 equates that order and its typical effects with an order of parameter setting. The question is how the acquisition procedure

  16. Material parameters for thermoelectric performance

    Indian Academy of Sciences (India)

    The thermoelectric performance of a thermoelement is ideally defined in terms of the so-called figure-of-merit = 2 / , where , and refer respectively to the Seebeck coefficient, electrical conductivity and thermal conductivity of the thermoelement material. However, there are other parameters which are fairly good ...

  17. Photovoltaic module parameters acquisition model

    Energy Technology Data Exchange (ETDEWEB)

    Cibira, Gabriel, E-mail: cibira@lm.uniza.sk; Koščová, Marcela, E-mail: mkoscova@lm.uniza.sk

    2014-09-01

    Highlights: • Photovoltaic five-parameter model is proposed using Matlab{sup ®} and Simulink. • The model acquisits input sparse data matrix from stigmatic measurement. • Computer simulations lead to continuous I–V and P–V characteristics. • Extrapolated I–V and P–V characteristics are in hand. • The model allows us to predict photovoltaics exploitation in different conditions. - Abstract: This paper presents basic procedures for photovoltaic (PV) module parameters acquisition using MATLAB and Simulink modelling. In first step, MATLAB and Simulink theoretical model are set to calculate I–V and P–V characteristics for PV module based on equivalent electrical circuit. Then, limited I–V data string is obtained from examined PV module using standard measurement equipment at standard irradiation and temperature conditions and stated into MATLAB data matrix as a reference model. Next, the theoretical model is optimized to keep-up with the reference model and to learn its basic parameters relations, over sparse data matrix. Finally, PV module parameters are deliverable for acquisition at different realistic irradiation, temperature conditions as well as series resistance. Besides of output power characteristics and efficiency calculation for PV module or system, proposed model validates computing statistical deviation compared to reference model.

  18. IAHR List of Sea Parameters

    DEFF Research Database (Denmark)

    Frigaard, Peter; Helm-Petersen, J; Klopman, G.

    1997-01-01

    A Working Group on multidirectional waves formed by the International Association for Hydraulic Research has proposed an update of the IAHR List of Sea State Parameters from 1986 in the part concerning directional. Especially wave structure interaction with reflection of the waves have been treated....

  19. SYVAC3 parameter distribution package

    Energy Technology Data Exchange (ETDEWEB)

    Andres, T; Skeet, A

    1995-01-01

    SYVAC3 (Systems Variability Analysis Code, generation 3) is a computer program that implements a method called systems variability analysis to analyze the behaviour of a system in the presence of uncertainty. This method is based on simulating the system many times to determine the variation in behaviour it can exhibit. SYVAC3 specializes in systems representing the transport of contaminants, and has several features to simplify the modelling of such systems. It provides a general tool for estimating environmental impacts from the dispersal of contaminants. This report describes a software object type (a generalization of a data type) called Parameter Distribution. This object type is used in SYVAC3, and can also be used independently. Parameter Distribution has the following subtypes: beta distribution; binomial distribution; constant distribution; lognormal distribution; loguniform distribution; normal distribution; piecewise uniform distribution; Triangular distribution; and uniform distribution. Some of these distributions can be altered by correlating two parameter distribution objects. This report provides complete specifications for parameter distributions, and also explains how to use them. It should meet the needs of casual users, reviewers, and programmers who wish to add their own subtypes. (author). 30 refs., 75 tabs., 56 figs.

  20. Identifying parameter regions for multistationarity

    DEFF Research Database (Denmark)

    Conradi, Carsten; Feliu, Elisenda; Mincheva, Maya

    2017-01-01

    is the avoidance of numerical analysis and parameter sampling. The procedure consists of a number of steps. Each of these steps might be addressed algorithmically using various computer programs and available software, or manually. We demonstrate our procedure on several models of gene transcription and cell...

  1. Load Estimation from Modal Parameters

    DEFF Research Database (Denmark)

    Aenlle, Manuel López; Brincker, Rune; Fernández, Pelayo Fernández

    2007-01-01

    In Natural Input Modal Analysis the modal parameters are estimated just from the responses while the loading is not recorded. However, engineers are sometimes interested in knowing some features of the loading acting on a structure. In this paper, a procedure to determine the loading from a FRF m...

  2. Photovoltaic module parameters acquisition model

    International Nuclear Information System (INIS)

    Cibira, Gabriel; Koščová, Marcela

    2014-01-01

    Highlights: • Photovoltaic five-parameter model is proposed using Matlab ® and Simulink. • The model acquisits input sparse data matrix from stigmatic measurement. • Computer simulations lead to continuous I–V and P–V characteristics. • Extrapolated I–V and P–V characteristics are in hand. • The model allows us to predict photovoltaics exploitation in different conditions. - Abstract: This paper presents basic procedures for photovoltaic (PV) module parameters acquisition using MATLAB and Simulink modelling. In first step, MATLAB and Simulink theoretical model are set to calculate I–V and P–V characteristics for PV module based on equivalent electrical circuit. Then, limited I–V data string is obtained from examined PV module using standard measurement equipment at standard irradiation and temperature conditions and stated into MATLAB data matrix as a reference model. Next, the theoretical model is optimized to keep-up with the reference model and to learn its basic parameters relations, over sparse data matrix. Finally, PV module parameters are deliverable for acquisition at different realistic irradiation, temperature conditions as well as series resistance. Besides of output power characteristics and efficiency calculation for PV module or system, proposed model validates computing statistical deviation compared to reference model

  3. QUALITY PARAMETERS IN NANOTECHNOLOGIC APPLICATIONS

    Directory of Open Access Journals (Sweden)

    Ayşegül Akdoğan Eker

    2013-06-01

    Full Text Available Nanotechnology concept which has added a new dimension to our lives in recent years, is finding a place in every sector day by day. The combined effect of nanotechnology is almost equal to the industrial revolution of last 200 years and have is able to fill all developments in a few years. However this development should be taken under control. Otherwise unstoppable new structures will not ease life but will be a problem for humanity. For this purpose, the main parameters (from the start up stage of nano-technologic applications to the obtained product should be checked. These parameters are actually not different than the adaptation of the classical quality indicators for nanotechnology applications. Especially it plays an important role in obtaining a uniform distribution and regarding the features of the end product in nano-technological ceramic and etc. applications. The most important problem faced in particles of that size is the accumulation they create. Another problem is the increasing friction force as size gets smaller. The friction force of asubstance increases proportionally with the cube of its surface area. Another problem is surface tension. The increasing surface tension due to increasing surface area will cause the particles to attract and stick to each other. The structures aimed to be obtained are mostly complex and especially in upwards approach, it is thermodynamically very hard for the atoms to get into that order. Therefore in this announcement, we stated the quality parameters that will be taken into consideration in nano-technological applications and the methods for obtaining those parameters. The aim is to explain these parameters with all dimensions so that they will lead the way to the future nano-technological applications.

  4. Parameter identification of chaos system based on unknown parameter observer

    International Nuclear Information System (INIS)

    Wang Shaoming; Luo Haigeng; Yue Chaoyuan; Liao Xiaoxin

    2008-01-01

    Parameter identification of chaos system based on unknown parameter observer is discussed generally. Based on the work of Guan et al. [X.P. Guan, H.P. Peng, L.X. Li, et al., Acta Phys. Sinica 50 (2001) 26], the design of unknown parameter observer is improved. The application of the improved approach is extended greatly. The works in some literatures [X.P. Guan, H.P. Peng, L.X. Li, et al., Acta Phys. Sinica 50 (2001) 26; J.H. Lue, S.C. Zhang, Phys. Lett. A 286 (2001) 148; X.Q. Wu, J.A. Lu, Chaos Solitons Fractals 18 (2003) 721; J. Liu, S.H. Chen, J. Xie, Chaos Solitons Fractals 19 (2004) 533] are only the special cases of our Corollaries 1 and 2. Some observers for Lue system and a new chaos system are designed to test our improved method, and simulations results demonstrate the effectiveness and feasibility of the improved approach

  5. Variables y modelos para la identificación y predicción del fracaso empresarial: revisión de la investigación empírica reciente.

    Directory of Open Access Journals (Sweden)

    Francisco J. Castaño Gutiérrez

    2012-06-01

    Full Text Available Este trabajo analiza la evolución en el tiempo de los estudios sobre fracaso empresarial. Con carácter general, partimos de la revisión crítica realizada en la literatura previa, y aportamos un análisis de la evidencia empírica adicional, con especial atención a la obtenida durante la última década. Pero además, para subsanar algunas deficiencias detectadas en las revisiones anteriores, nos ocupamos de tres aspectos, que pueden considerarse la principal contribución de este trabajo: primero, analizamos la evolución en las últimas décadas del concepto de fracaso empresarial o fallido, detectando cierta evolución desde la identificación hacia la predicción; segundo, analizamos las variables empleadas en los modelos, aportando un estudio de los rasgos empresariales que se representan con las variables (frente al tradicional análisis de frecuencia de las propias variables individuales, siendo los resultados más acordes con los planteamientos y desarrollos teóricos clásicos sobre el fracaso empresarial; y, finalmente, destacamos los puntos fuertes y débiles de las metodologías que, por su reciente aparición, no habían sido analizadas o muy poco por revisiones anteriores: las técnicas de inteligencia artificial y el análisis envolvente de datos (DEA. Adicionalmente, integramos en la revisión el numeroso grupo de trabajos empíricos publicados en España sobre la cuestión, y que no aparecían en ninguna de las revisiones previas analizadas.This work analyzes the evolution of business failure literature. In it, we consider previous critical revisions, contributing with the analysis of additional empirical evidence, paying special attention to the last decade. In order to make up for some deficiencies detected in previous revisions, we deal with three aspects that can be considered the main contribution of this work. First, we analyze the business failure concept during the last decades, detecting, from identification to

  6. Princípios nas ciências empíricas e o seu tratamento em livros didáticos Principles in the empirical sciences and their treatment in textbooks

    Directory of Open Access Journals (Sweden)

    José Francisco Custódio

    2004-12-01

    Full Text Available Neste artigo, analisamos o papel desempenhado pelos princípios na produção e no ensino de conteúdos científicos. Nós constatamos que nas ciências empíricas princípios são guias heurísticos genéricos na produção científica. E exercendo essa função, um princípio é capaz de limitar consideravelmente as possíveis arbitrariedades dentro de um sistema teórico. No ensino, focalizamos o tratamento do princípio de conservação de energia em livros didáticos de física. Nós concluímos que existe uma frágil relação entre teorias/modelos e objetos/eventos nos livros didáticos; disso decorre que o tratamento dos princípios assume apenas o papel de técnica adicional para a resolução de problemas fechados, um estatuto epistemológico reduzido e diferente daquele das ciências empíricas. Nós sugerimos que tratar os princípios nos livros didáticos aproximando-os de sua função teórica exige incentivar a atividade de criação dos estudantes na construção de significados balizada na validade dos princípios. Isto se daria por meio da apresentação de situações físicas não modelizadas, não idealizadas e abstraídas. Assim, a riqueza heurística do princípio estaria sendo explorada, e não somente aspectos operacionais.In this article, we analyse the role performed by the principles in teaching scientific content. We observed that principles in the empirical sciences are generic heuristic guides in scientific production and by exercising this function, a principle is able to limit the feasible arbitrarinesses inside a theoretical system. In teaching, we have focused on the treatment of energy conservation principles in physics textbooks. We concluded that there is a fragile relationship between theory/model and objects/events in textbooks: consequently the treatment of principles only assumes a role as an additional technique to solve given problems. We suggested the enhanced treatment of principles in textbooks by

  7. Análise Empírica dos Impactos dos Accruals na Variação do Capital Circulante Líquido: um estudo no setor de siderurgia e metalurgia

    Directory of Open Access Journals (Sweden)

    Romualdo Douglas Colauto

    2009-10-01

    Full Text Available O artigo demonstra os impactos dos accruals na variação do capital circulante líquido em companhias abertas do setor de siderurgia e metalurgia. Para constatação de evidências empíricas, utilizou-se como população-alvo as Sociedades Anônimas Abertas apresentadas entre as 500 Maiores e Melhores Empresas, segundo critério da Revista Exame na edição de 2003. A amostra extraída da população foi do tipo intencional não probabilística, com 7 empresas representativas do setor de Siderurgia e Metalurgia. O estudo é delineado como descritivo utilizando-se as técnicas de cluster e intervalo interpercentil para categorizar os dados necessários para as inferências. Os resultados ajudam a melhorar qualidade da informação contábil ao mostrar que os accruals provocam alterações no resultado do período, mas não infl uenciam, simultaneamente, o fluxo financeiro das atividades operacionais das empresas. Coefi cientes de correlações entre o resultado contábil do período ajustado pelos accruals e a variação do capital circulante líquido não apresentaram homogeneidade nos setores observados, mas denotaram significância estatística.

  8. Reducción de la demanda térmica originada en la vinificación en bodegas localizadas en zona de clima árido, mediante modelado térmico semi-empírico

    Directory of Open Access Journals (Sweden)

    Alba Ramos Sanz

    2015-12-01

    Full Text Available El estudio de tres muestras de bodegas elaboradoras, de San Juan, Argentina, revela que la demanda energética (DE en la vinificación se vincula a los procesos térmicos que se desenvuelven en el interior de las envolventes de vinificación (EV. Estos procesos determinan la calidad del vino y se extienden desde la fermentación hasta la conservación del mismo, durante los cuales el producto requiere cierta rigurosidad térmica, a la que se refiere análogamente en este trabajo como confort del vino. Para determinar la incidencia del clima árido en las condiciones de confort del vino y en la consecuente DE en acondicionamiento térmico, se diseña una planilla de modelización semi-empírica. Mediante este instrumento se experimentan los procesos térmicos de fermentación y conservación del vino en períodos cálidos (fermentación y conservación y fríos (conservación. Los resultados de la modelización confirman que un incremento de la inercia térmica de las EV promueve la disminución de la carga térmica (QT, la cual repercute sobre la DE en la bodega.

  9. Saúde, nutrição e classes sociais: o nexo empírico evidenciado em um grande centro urbano, Brasil Health, nutrition and social class: the empirical link demonstrated

    Directory of Open Access Journals (Sweden)

    Carlos Augusto Monteiro

    1989-10-01

    Full Text Available Embora freqüentemente assumida como verdadeira, a relação entre classe social e estado de saúde e nutrição raramente tem sido estudada no plano empírico. Adotando-se proposta classificatória que permite a identificação operacional do conceito de classe social em sociedades de organização complexa, procurou-se estabelecer e comparar o estado de saúde e nutrição de uma amostra das crianças da cidade de São Paulo pertencentes a distintas classes sociais. A partir da observação da distribuição do índice altura/idade, evidenciou-se crescimento normal - e portanto condições ótimas de saúde e nutrição - apenas entre as crianças pertencentes à burguesia e à pequena burguesia, as quais correspondem a cerca de 30% da população. Diferenças significantes (p The relationship between social class and nutritional status, although frequently presumed true, has scarcely ever been studied empirically. The health and nutritional status of a sample of children from different social classes in the city of S. Paulo (Brazil are studied by means of an on operational classification of social class. Through the analysis of the height for age distribution normal growth - and, therefore, favourable health status - eas found only among the burgeoisie and the small-burgeoisie, these two classes together constituting about 30% of the total population. Significant divergences from an expected anthropometric standard were found among all the segments of the working-class population. Differences in income and schooling among the classes corroborate the empirical link found between social class and health and nutritional status.

  10. Adquisición de competencias a través de juegos serios en el área contable: un análisis empírico

    Directory of Open Access Journals (Sweden)

    María Sol Calabor

    2018-01-01

    Full Text Available El actual sistema de educación superior se basa en un aprendizaje activo por parte del estudiante enfocado al desarrollo de competencias genéricas y específicas. En este contexto muchos autores defienden el uso de simulaciones que favorezcan dicho aprendizaje y, los denominados «juegos serios» (serious games [SG] se adaptan a este reto. Sin embargo, el empuje que cabría esperar por el desarrollo de las nuevas tecnologías y de la llegada de los denominados «nativos digitales» a las aulas no es coherente ni con su grado de implantación ni con la escasa investigación desarrollada sobre la efectividad de su uso. Los objetivos de este estudio son describir una experiencia docente de implantación de un SG en el ámbito universitario de una materia de contabilidad de gestión y evaluar la adquisición de competencias tanto genéricas como específicas previamente definidas como objetivo de dicha materia, mediante el análisis de la percepción de los estudiantes. Se utilizan dos cuestionaros pre- y postactividad, y se concluye que, a priori, no parecen existir barreras ni tecnológicas ni demográficas para su utilización. Adicionalmente, los estudiantes perciben que el SG contribuye significativamente a la adquisición de las competencias. Observamos también de manera directa que se fomenta el trabajo en equipo. Este trabajo contribuye a la escasa investigación empírica sobre el uso y la potencialidad de los SG como instrumentos efectivos de aprendizaje, concretamente en el ámbito de la enseñanza universitaria en el área de gestión.

  11. Exportações brasileiras de suco de laranja e subsídios americanos: uma análise empírica de estratégias comerciais (1991-2006

    Directory of Open Access Journals (Sweden)

    Cássia Kely Favoretto Costa

    2012-03-01

    Full Text Available O Brasil e os Estados Unidos são considerados os principais participantes no mercado mundial do suco de laranja. Os subsídios americanos afetam as exportações brasileiras de suco de laranja concentrado e congelado (SLCC e a participação do País no mercado mundial de tal produto; neste sentido, objetiva-se analisar a influência dos subsídios agrícolas americanos sobre as exportações do SLCC, no período entre 1991 e 2006. O modelo teórico parase estudar o comércio internacional foi proposto por Brander e Spencer (1985; Brander (1995 e Spencer e Brander (2007, com enfoque de competição imperfeita incorporando a intervenção governamental. Na abordagem empírica, realizou-se uma junção de modelos de séries temporais e de teoria dos jogos, como instrumentos para avaliar o efeito dos subsídios sobre as exportações do suco de laranja. Concluiu-se que a proteção americana prejudicou a capacidade exportadora do Brasil no período examinado. Como conclusão, reforça-se a participação ativa do Brasil na defesa da liberalização do comércio agrícola, para o seu acesso ao setor protegido e também para a conquista de novos parceiros comerciais.

  12. Valor da Marca: Teste Empírico da Importância das Dimensões Formadoras do Valor da Marca na Perspectiva do Consumidor no Contexto Brasileiro

    Directory of Open Access Journals (Sweden)

    Luiz Sergio Costa

    2012-09-01

    Full Text Available O presente estudo investigou a importância das dimensões formadoras do valor da marca na perspectiva do consumidor no contexto brasileiro, mediante o teste empírico do modelo proposto por Yoo e Donthu (2001. Outros autores validaram a multidimensionalidade do conceito de valor da marca na perspectiva do consumidor (Myers, 2003; Villarejo-Ramos e Sánchez-Franco, 2005; Vargas e Luce, 2006. Todavia, estes estudos divergiram quanto ao número de dimensões e suas respectivas importâncias, evidenciando um hiato na literatura. Para responder as perguntas deste estudo, foi realizada uma survey com 636 consumidores. Os dados coletados foram submetidos à técnica estatística de análise fatorial confirmatória (CFA e modelagem de equações estruturais (SEM. Os resultados do estudo sugerem a validade parcial do modelo de Yoo e Donthu (2001. A importância das dimensões lealdade e qualidade percebida na formação do valor da marca na perspectiva do consumidor foram suportadas empiricamente. Entretanto, a inexistência de relação significativa entre consciência / associações e valor geral da marca sugere a necessidade de mais estudos, seja para validar essa relação, seja para propor novas escalas para mensurar o construto de consciência / associações à marca. DOI: 10.5585/remark.v11i2.2357

  13. O imigrante e seus irmãos: as pesquisas empíricas de Florestan Fernandes e Gino Germani The immigrant and his brothers: the empirical researches of Florestan Fernandes and Gino Germani

    Directory of Open Access Journals (Sweden)

    Antonio Brasil Jr.

    2010-01-01

    Full Text Available No trabalho, destaco, em perspectiva comparada, algumas formulações de Florestan Fernandes e de Gino Germani, protagonistas da renovação da sociologia nas universidades de São Paulo e de Buenos Aires, respectivamente. Através de pesquisas empíricas, os dois procuraram investigar em que sentido a modernização afetava diferencialmente os grupos sociais, repondo padrões seculares de desigualdade. Fernandes e Germani viram, ainda, no "imigrante de ultramar", o portador por excelência das mudanças em curso, porquanto teria logrado se inserir, tanto em São Paulo quanto em Buenos Aires, nas posições mais dinâmicas da ordem capitalista em expansão, apesar de seu baixo impacto na democratização do sistema de dominação nos dois contextos.In the paper, I compare some arguments about the social change developed by Florestan Fernandes and Gino Germani, protagonists of the renewal of sociology at the universities of Sao Paulo and Buenos Aires, respectively. Through empirical research, both sought to investigate how the modernization process differentially affected social groups, restoring durable patterns of inequality. Fernandes and Germani considered, moreover, the "immigrant" the main agent of the social changes underway, due to his successful insertion, in Sao Paulo and Buenos Aires, in the most dynamic positions of the capitalist order in expansion, despite his low impact on the democratization of the system of domination in both contexts.

  14. Motivações determinantes para a recompra de ações: um estudo empírico no mercado de ações brasileiro no período de 1995 a 2008.

    Directory of Open Access Journals (Sweden)

    Sandro de Freitas Nascimento

    2011-10-01

    Full Text Available O objetivo deste trabalho foi verificar as motivações determinantes para a recompra de ações no mercado de ações brasileiro, no período de 1995 a 2008. As variáveis explicativas, utilizadas nos testes estatísticos, foram fundamentadas em estudos anteriores (DURAND, 1952; JENSEN; MECKLING, 1976; SPENCE, 1973. Esta é uma pesquisa positivista, realizada por meio da coleta de dados da Economática. Os testes empíricos foram efetuados por meio de regressão múltipla de dados em Pooled, com ajuda dos métodos LS (Least Squares e Tobit. O Pooled e o Tobit foram aplicados para verificar a robustez estatística dos resultados. O estudo foi desenvolvido com base nas teorias de ajuste da estrutura do capital, de agência, de substituição de dividendos e de sinalização. Foram testadas as seguintes motivações: ajuste da estrutura do capital, redução do fluxo de caixa disponível, substituição do pagamento de dividendos e subavaliação do valor da empresa. Os resultados encontrados em relação à recompra de ações indicam que a motivação que se mostrou estatisticamente significante foi a redução do fluxo de caixa disponível. Isso conduz à afirmação de que, com base na teoria de agência, empresas com disponibilidade de caixa podem recomprar ações na intenção de minimizar o conflito existente entre o principal e o agente.

  15. Fast determination of plasma parameters

    International Nuclear Information System (INIS)

    Wijnands, T.J.; Parlange, F.; Joffrin, E.

    1995-01-01

    Fast analysis of diagnostic signals of a tokamak discharge is demonstrated by using 4 fundamentally different techniques. A comparison between Function Parametrization (FP), Canonical Correlation Analysis (CCA) and a particular Neural Network (NN) configuration known as the Multi Layer Perceptron (MLP) is carried out, thereby taking a unique linear model based on a Singular Value Decomposition (SVD) as a reference. The various techniques provide all functional representations of characteristic plasma parameters in terms of the values of the measurements and are based on an analysis of a large, experimentally achieved database. A brief mathematical description of the various techniques is given, followed by two particular applications to Tore Supra diagnostic data. The first problem is concerned with the identification of the plasma boundary parameters using the poloidal field and differential poloidal flux measurements. A second application involves the interpretation of line integrated data from the multichannel interfero-polarimeter to obtain the central value of the safety factor. (author) 4 refs.; 3 figs

  16. Cogeneration: Key feasibility analysis parameters

    International Nuclear Information System (INIS)

    Coslovi, S.; Zulian, A.

    1992-01-01

    This paper first reviews the essential requirements, in terms of scope, objectives and methods, of technical/economic feasibility analyses applied to cogeneration systems proposed for industrial plants in Italy. Attention is given to the influence on overall feasibility of the following factors: electric power and fuel costs, equipment coefficients of performance, operating schedules, maintenance costs, Italian Government taxes and financial and legal incentives. Through an examination of several feasibility studies that were done on cogeneration proposals relative to different industrial sectors, a sensitivity analysis is performed on the effects of varying the weights of different cost benefit analysis parameters. With the use of statistical analyses, standard deviations are then determined for key analysis parameters, and guidelines are suggested for analysis simplifications

  17. Parameter prediction for microwave garnets

    International Nuclear Information System (INIS)

    Ramer, R.

    1996-01-01

    Full text: Linearity of the microwave parameters (resonance linewidth ΔH and effective linewidth ΔH eff ) is demonstrated and their use in the Computer-aided design (CAD)/Computer-aided manufacturing (CAM) of new microwave garnets is proposed. Such an approach would combine a numerical database of microwave data and several computational programs. The model is an applied formulation of the analysis of a wide range of microwave garnets

  18. Inelastic scattering and deformation parameters

    International Nuclear Information System (INIS)

    Ford, J.L.C. Jr.

    1978-01-01

    In recent years there has been extensive study of nuclear shape parameters by electron scattering, μ meson atomic transitions, Coulomb excitation and direct nuclear inelastic scattering. Inelastic scattering of strongly absorbed particles, e.g., alpha-particles and heavy ions, at energies below and above the Coulomb barrier probe the charge and mass distributions within the nucleus. This paper summarizes measurements in this field performed at Oak Ridge National Laboratory

  19. Precision measurements of electroweak parameters

    CERN Document Server

    Savin, Alexander

    2017-01-01

    A set of selected precise measurements of the SM parameters from the LHC experiments is discussed. Results on W-mass measurement and forward-backward asymmetry in production of the Drell--Yan events in both dielectron and dimuon decay channels are presented together with results on the effective mixing angle measurements. Electroweak production of the vector bosons in association with two jets is discussed.

  20. Failure probability under parameter uncertainty.

    Science.gov (United States)

    Gerrard, R; Tsanakas, A

    2011-05-01

    In many problems of risk analysis, failure is equivalent to the event of a random risk factor exceeding a given threshold. Failure probabilities can be controlled if a decisionmaker is able to set the threshold at an appropriate level. This abstract situation applies, for example, to environmental risks with infrastructure controls; to supply chain risks with inventory controls; and to insurance solvency risks with capital controls. However, uncertainty around the distribution of the risk factor implies that parameter error will be present and the measures taken to control failure probabilities may not be effective. We show that parameter uncertainty increases the probability (understood as expected frequency) of failures. For a large class of loss distributions, arising from increasing transformations of location-scale families (including the log-normal, Weibull, and Pareto distributions), the article shows that failure probabilities can be exactly calculated, as they are independent of the true (but unknown) parameters. Hence it is possible to obtain an explicit measure of the effect of parameter uncertainty on failure probability. Failure probability can be controlled in two different ways: (1) by reducing the nominal required failure probability, depending on the size of the available data set, and (2) by modifying of the distribution itself that is used to calculate the risk control. Approach (1) corresponds to a frequentist/regulatory view of probability, while approach (2) is consistent with a Bayesian/personalistic view. We furthermore show that the two approaches are consistent in achieving the required failure probability. Finally, we briefly discuss the effects of data pooling and its systemic risk implications. © 2010 Society for Risk Analysis.

  1. PUSPATI Triga Reactor pulsing parameters

    International Nuclear Information System (INIS)

    Gui Ah Auu; Puad Haji Abu; Yaziz Yunus

    1984-01-01

    The pulsing experiment was carried out as part of the commissioning activites of PUSPATI TRIGA Reactor (PTR). Several parameters of PTR were deduced from the experiment. It was found that the maximum temperature of the fuel was far below the safety limit when the maximum allowable positive reactivity of $3.00 was inserted into the core. The peak power achieved was 1354 Mw. (author)

  2. Parameter estimation in plasmonic QED

    Science.gov (United States)

    Jahromi, H. Rangani

    2018-03-01

    We address the problem of parameter estimation in the presence of plasmonic modes manipulating emitted light via the localized surface plasmons in a plasmonic waveguide at the nanoscale. The emitter that we discuss is the nitrogen vacancy centre (NVC) in diamond modelled as a qubit. Our goal is to estimate the β factor measuring the fraction of emitted energy captured by waveguide surface plasmons. The best strategy to obtain the most accurate estimation of the parameter, in terms of the initial state of the probes and different control parameters, is investigated. In particular, for two-qubit estimation, it is found although we may achieve the best estimation at initial instants by using the maximally entangled initial states, at long times, the optimal estimation occurs when the initial state of the probes is a product one. We also find that decreasing the interqubit distance or increasing the propagation length of the plasmons improve the precision of the estimation. Moreover, decrease of spontaneous emission rate of the NVCs retards the quantum Fisher information (QFI) reduction and therefore the vanishing of the QFI, measuring the precision of the estimation, is delayed. In addition, if the phase parameter of the initial state of the two NVCs is equal to πrad, the best estimation with the two-qubit system is achieved when initially the NVCs are maximally entangled. Besides, the one-qubit estimation has been also analysed in detail. Especially, we show that, using a two-qubit probe, at any arbitrary time, enhances considerably the precision of estimation in comparison with one-qubit estimation.

  3. Delayed recombination and cosmic parameters

    International Nuclear Information System (INIS)

    Galli, Silvia; Melchiorri, Alessandro; Bean, Rachel; Silk, Joseph

    2008-01-01

    Current cosmological constraints from cosmic microwave background anisotropies are typically derived assuming a standard recombination scheme, however additional resonance and ionizing radiation sources can delay recombination, altering the cosmic ionization history and the cosmological inferences drawn from the cosmic microwave background data. We show that for recent observations of the cosmic microwave background anisotropy, from the Wilkinson microwave anisotropy probe satellite mission (WMAP) 5-year survey and from the arcminute cosmology bolometer array receiver experiment, additional resonance radiation is nearly degenerate with variations in the spectral index, n s , and has a marked effect on uncertainties in constraints on the Hubble constant, age of the universe, curvature and the upper bound on the neutrino mass. When a modified recombination scheme is considered, the redshift of recombination is constrained to z * =1078±11, with uncertainties in the measurement weaker by 1 order of magnitude than those obtained under the assumption of standard recombination while constraints on the shift parameter are shifted by 1σ to R=1.734±0.028. From the WMAP5 data we obtain the following constraints on the resonance and ionization sources parameters: ε α i <0.058 at 95% c.l.. Although delayed recombination limits the precision of parameter estimation from the WMAP satellite, we demonstrate that this should not be the case for future, smaller angular scales measurements, such as those by the Planck satellite mission.

  4. Key parameters controlling radiology departments

    International Nuclear Information System (INIS)

    Busch, Hans-Peter

    2011-01-01

    For radiology departments and outstanding practises control and optimization of processes demand an efficient management based on key data. Systems of key data deliver indicators for control of medical quality, service quality and economics. For practices effectiveness (productivity), for hospitals effectiveness and efficiency are in the focus of economical optimization strategies. Task of daily key data is continuous monitoring of activities and workflow, task of weekly/monthly key data is control of data quality, process quality and achievement of objectives, task of yearly key data is determination of long term strategies (marketing) and comparison with competitors (benchmarking). Key parameters have to be defined clearly and have to be available directly. For generation, evaluation and control of key parameters suitable forms of organization and processes are necessary. Strategies for the future will be directed more to the total processes of treatment. To think in total processes and to steer and optimize with suitable parameters is the challenge for participants in the healthcare market of the future. (orig.)

  5. Modifying factors for metabolic parameters

    International Nuclear Information System (INIS)

    Inaba, Jiro

    1990-01-01

    Studies on factors which influence the metabolic parameter for calculation of radiation doses from intakes of radionuclides are very important for estimation of the doses for the general public, because the present procedures recommended by the International Commission on Radiological Protection is for occupationally exposed workers and the underlying metabolic and dosimetric models have been developed from studies on adult man and experiments on adult animals and from observations on radionuclides in physico-chemically simple form. Many factors have been reported to influence the metabolic parameters. Among them, the food-chain involvement of radionuclides and the age-dependence in humans and animals are most significant as environmental and physiological factor, respectively. In connection with the age-dependence of dose calculation, the ICRP started a new programme. They organized a Task Group on Age-Dependent Dose-Factors where relevant information on metabolic and biokinetic parameters are presently being reviewed for development of a set of dose factors for the following age-groups: infant, 1-year-old, 5-year-old, 10-year-old, 15-year-old, and ICRP Reference Man. The first stage of the work is for age-dependent integrated organ and effective dose factors for radioisotopes of the following elements: hydrogen, carbon, iodine, cesium, strontium, plutonium and americium. (author)

  6. Parameter extraction with neural networks

    Science.gov (United States)

    Cazzanti, Luca; Khan, Mumit; Cerrina, Franco

    1998-06-01

    In semiconductor processing, the modeling of the process is becoming more and more important. While the ultimate goal is that of developing a set of tools for designing a complete process (Technology CAD), it is also necessary to have modules to simulate the various technologies and, in particular, to optimize specific steps. This need is particularly acute in lithography, where the continuous decrease in CD forces the technologies to operate near their limits. In the development of a 'model' for a physical process, we face several levels of challenges. First, it is necessary to develop a 'physical model,' i.e. a rational description of the process itself on the basis of know physical laws. Second, we need an 'algorithmic model' to represent in a virtual environment the behavior of the 'physical model.' After a 'complete' model has been developed and verified, it becomes possible to do performance analysis. In many cases the input parameters are poorly known or not accessible directly to experiment. It would be extremely useful to obtain the values of these 'hidden' parameters from experimental results by comparing model to data. This is particularly severe, because the complexity and costs associated with semiconductor processing make a simple 'trial-and-error' approach infeasible and cost- inefficient. Even when computer models of the process already exists, obtaining data through simulations may be time consuming. Neural networks (NN) are powerful computational tools to predict the behavior of a system from an existing data set. They are able to adaptively 'learn' input/output mappings and to act as universal function approximators. In this paper we use artificial neural networks to build a mapping from the input parameters of the process to output parameters which are indicative of the performance of the process. Once the NN has been 'trained,' it is also possible to observe the process 'in reverse,' and to extract the values of the inputs which yield outputs

  7. On noncommutativity with bifermionic parameter

    International Nuclear Information System (INIS)

    Acatrinei, Ciprian Sorin

    2008-01-01

    Recently Gitman and Vassilevich proposed an interesting model of noncommutative (NC) scalar field theory, with a noncommutativity parameter assumed to be the product of two Grassmann variables. They showed in particular that the model possesses a local energy-momentum tensor. Since such a property is quite unusual for a NC model, we provide here an alternative picture, based on an operatorial formulation of NC field theory. It leads to complete locality of the degrees of freedom of the theory, a property in agreement with the termination of the star-product at the second term in its series. (author)

  8. Investigation on Ion Source Parameters

    CERN Document Server

    M. Cheikh Mhamed, S. Essabaa, C. Lau

    The EURISOL multi-mega-watt target station requires dedicated radioactive ion sources. Notably, they must be capable of operating under extremely hard radiations and with a larger fission target producing over 1014 fissions/s. The realisation of next-generation ion sources suitable for such operating conditions needs exhaustive studies and developments. In order to take up such a challenge, a review on radioactive ion sources was achieved and the investigation on ion source parameters was in particular focused on a plasma ion source through a R&D program.

  9. DP: Parameter Display Page Program

    International Nuclear Information System (INIS)

    Anderson, M.

    1994-01-01

    The Parameter Display Page program (DP) is a Motif/X11-based program to allow easily configured, dynamic device and process variable monitoring and manipulation in the EPICS environment. DP provides a tabular data format for interactive viewing and manipulation of device and process variable statistics, as well as formatted PostScript output to files and printers. DP understands and operates in two (unfortunately disjoint at this time) namespaces in the EPICS environment ''devices'' and ''process variables''. The higher level namespace of devices includes Composite and Atomic Devices registered via the Device Access server; the lower level (flat) namespace is that of normal Process Variables accessible via Channel Access

  10. Uncertainties of Molecular Structural Parameters

    International Nuclear Information System (INIS)

    Császár, Attila G.

    2014-01-01

    Full text: The most fundamental property of a molecule is its three-dimensional (3D) structure formed by its constituent atoms (see, e.g., the perfectly regular hexagon associated with benzene). It is generally accepted that knowledge of the detailed structure of a molecule is a prerequisite to determine most of its other properties. What nowadays is a seemingly simple concept, namely that molecules have a structure, was introduced into chemistry in the 19th century. Naturally, the word changed its meaning over the years. Elemental analysis, simple structural formulae, two-dimensional and then 3D structures mark the development of the concept to its modern meaning. When quantum physics and quantum chemistry emerged in the 1920s, the simple concept associating structure with a three-dimensional object seemingly gained a firm support. Nevertheless, what seems self-explanatory today is in fact not so straightforward to justify within quantum mechanics. In quantum chemistry the concept of an equilibrium structure of a molecule is tied to the Born-Oppenheimer approximation but beyond the adiabatic separation of the motions of the nuclei and the electrons the meaning of a structure is still slightly obscured. Putting the conceptual difficulties aside, there are several experimental, empirical, and theoretical techniques to determine structures of molecules. One particular problem, strongly related to the question of uncertainties of “measured” or “computed” structural parameters, is that all the different techniques correspond to different structure definitions and thus yield different structural parameters. Experiments probing the structure of molecules rely on a number of structure definitions, to name just a few: r_0, r_g, r_a, r_s, r_m, etc., and one should also consider the temperature dependence of most of these structural parameters which differ from each other in the way the rovibrational motions of the molecules are treated and how the averaging is

  11. Resonance parameter analysis with SAMMY

    International Nuclear Information System (INIS)

    Larson, N.M.; Perey, F.G.

    1988-01-01

    The multilevel R-matrix computer code SAMMY has evolved over the past decade to become an important analysis tool for neutron data. SAMMY uses the Reich-Moore approximation to the multilevel R-matrix and includes an optional logarithmic parameterization of the external R-function. Doppler broadening is simulated either by numerical integration using the Gaussian approximation to the free gas model or by a more rigorous solution of the partial differential equation equivalent to the exact free gas model. Resolution broadening of cross sections and derivatives also has new options that more accurately represent the experimental situation. SAMMY treats constant normalization and some types of backgrounds directly and treats other normalizations and/or backgrounds with the introduction of user-generated partial derivatives. The code uses Bayes' method as an efficient alternative to least squares for fitting experimental data. SAMMY allows virtually any parameter to be varied and outputs values, uncertainties, and covariance matrix for all varied parameters. Versions of SAMMY exist for VAX, FPS, and IBM computers

  12. Kinetic parameters from thermogravimetric analysis

    Science.gov (United States)

    Kiefer, Richard L.

    1993-01-01

    High performance polymeric materials are finding increased use in aerospace applications. Proposed high speed aircraft will require materials to withstand high temperatures in an oxidative atmosphere for long periods of time. It is essential that accurate estimates be made of the performance of these materials at the given conditions of temperature and time. Temperatures of 350 F (177 C) and times of 60,000 to 100,000 hours are anticipated. In order to survey a large number of high performance polymeric materials on a reasonable time scale, some form of accelerated testing must be performed. A knowledge of the rate of a process can be used to predict the lifetime of that process. Thermogravimetric analysis (TGA) has frequently been used to determine kinetic information for degradation reactions in polymeric materials. Flynn and Wall studied a number of methods for using TGA experiments to determine kinetic information in polymer reactions. Kinetic parameters, such as the apparent activation energy and the frequency factor, can be determined in such experiments. Recently, researchers at the McDonnell Douglas Research Laboratory suggested that a graph of the logarithm of the frequency factor against the apparent activation energy can be used to predict long-term thermo-oxidative stability for polymeric materials. Such a graph has been called a kinetic map. In this study, thermogravimetric analyses were performed in air to study the thermo-oxidative degradation of several high performance polymers and to plot their kinetic parameters on a kinetic map.

  13. Multivariate optimization of ILC parameters

    International Nuclear Information System (INIS)

    Bazarov, I.V.; Padamsee, H.S.

    2005-01-01

    We present results of multiobjective optimization of the International Linear Collider (ILC) which seeks to maximize luminosity at each given total cost of the linac (capital and operating costs of cryomodules, refrigeration and RF). Evolutionary algorithms allow quick exploration of optimal sets of parameters in a complicated system such as ILC in the presence of realistic constraints as well as investigation of various what-if scenarios in potential performance. Among the parameters we varied there were accelerating gradient and Q of the cavities (in a coupled manner following a realistic Q vs. E curve), the number of particles per bunch, the bunch length, number of bunches in the train, etc. We find an optimum which decreases (relative to TESLA TDR baseline) the total linac cost by 22%, capital cost by 25% at the same luminosity of 3 x 10 38 m -2 s -1 . For this optimum the gradient is 35 MV/m, the final spot size is 3.6 nm, and the beam power is 15.9 MV/m. Changing the luminosity by 10 38 m -2 s -1 results in 10% change in the total linac cost and 4% in the capital cost. We have also explored the optimal fronts of luminosity vs. cost for several other scenarios using the same approach. (orig.)

  14. EMP Design Guidelines for Naval Ship Systems

    Science.gov (United States)

    1975-08-22

    le xc Ci .ube irret i Type FXC it LA 38 Beads 4 * 1 svj- I * 1 1 \\ Measured 3( )0 Beads V i i V 30 Bead 1 s...ATTN: R. W. Rostrom RCA Corporation Government & Commercial Systems Astro Electronics Division P. 0. Box 800 Princeton, New Jersey 08540 ATTN

  15. DNA EMP AWARENESS COURSE NOTES. THIRD EDITION

    Science.gov (United States)

    1977-10-01

    nuclei larger fmd neutron before hitting another than uranium do not exist in nature; they U nucleus. This time is in the order are unstable against...two radiators are driven from a common source to prcvide a vertically polarized test field. The U.S. Army at White Sands Missile Ran e, Now Mpxirno, fta

  16. Supplemental Grounding of Extended EMP Collectors.

    Science.gov (United States)

    1982-01-31

    G52AAXEX40602 H2590D as Contract DNA 001-80-C-0294. The program was monitored by Major Blair Williams, RAEE . The work described in this report was...ATTN: RAEE ATTN: DPOPM-COM-W-D ATTN RAAE ATTN: NATA Deputy Chief of Staff for Rsch Dev & Acq 4 cy ATTN: TITL ATTN: DAMA-CSS-N Defense Tech Info Ctr

  17. El Controller ante la Nueva Era de la Información, de Gestión en la Empresa. Contrastes Empíricos en el Sector Español del Automóvil

    Directory of Open Access Journals (Sweden)

    Javier Gimeno Zuera

    1999-06-01

    Full Text Available El objetivo de este trabajo es fundamentar la necesidad de que el Controller realice funciones similares a las de Dirección, centradas en el ámbito de la información, ejerciendo de nexo de unión entre los diferentes niveles de responsabilidad encargados de la toma de decisiones. A lo largo del mismo, se contrastan las propuestas teóricas con la realización de un estudio empírico que, dentro del sector de empresas productoras de automóviles, se ha llevado a cabo utilizando la metodología del caso a través de la práctica de entrevistas a los cargos directivos que realizan funciones similares a las del Controller. Asimismo, queda suficientemente acreditada la importancia del Controller como coordinador de las nuevas tecnologías de la información. También se confirma la importancia de que quien ejerza estas funciones posea formación académica en economía, empresa y contabilidad y suficiente experiencia en la empresa. Por otra parte, se ha corroborado que una tarea básica desempeñada por los mismos es siempre la coordinación presupuestaria. The aim of this work is to establish the need for the Controller to carry out functions similar to those of Management, ,focusing on the area of information, exercising link a role between the different levels of responsibility in the decision-making process. We test our theoretical proposals 011. the basis of an empirical study of companies operating in the automobile manufacturing sector, using the case methodology by way of interviews with members of management who exercise functions similar to those of the Controller. Likewise, we find sufficient confirmation of the importance of the Controller as coordinator of the new information technologies and, similarly, that the person who exercises these functions must have academic training in economics, business studies and accounting and have sufficient practical experience in that particular firm. Furthermore, it is corroborated that one of the

  18. Retribución y composición del Consejo de Administración : evidencia empírica para las empresas cotizadas españolas

    Directory of Open Access Journals (Sweden)

    Elena Merino Madrid

    2009-06-01

    Full Text Available Este trabajo tiene como objetivo principal analizar las características de las empresas españolas cotizadas en el Mercado Continuo durante el ejercicio 2007, excluyendo las empresas financieras, en relación a la retribución, composición y estructura del Consejo de Administración, a fin de observar si éstas reúnen ciertas condiciones que inhiban o aviven los problemas de agencia entre accionistas y directivos. Para ello, en primer lugar, se ofrece una revisión de la literatura previa que versa sobre el conflicto de intereses entre propietarios y directivos en relación a la compensación y composición de los órganos de administración; en segundo lugar, se describe la metodología utilizada para el desarrollo del análisis empírico y se presentan los resultados del mismo; y, por último, se exponen las principales conclusiones.De tos resultado obtenidos se deduce que algunas de los aspectos de las empresas cotizadas españolas pueden redundar en la aparición de problemas de agencia entre directivos y accionistas, entre ellos: la dimensión y estructura de los sistemas retributivos, la falta de transparencia informativa al respecto de las retribuciones individuales de consejeros y la acumulación de poderes del presidente del Consejo de Administración y el primer ejecutivo.This paper mainly aims at analysing the characteristics of Spanish companies listed in the Stock Exchange during the year 2007, financial companies excluded, in relation to the remuneration, composition and structure of the Board of Directors, in order to see if the companies meet certain conditions that inhibit or intensify the agency problems among shareholders and managers. In order to do this, firstly, we provide a review of the literature which deals with the conflict of interests among owners and managers in relation to the composition and compensation of the administrative staff; secondly, we describe the methodology used to develop the empirical analysis

  19. O orçamento público brasileiro e a perspectiva emancipatória: existem evidências empíricas que sustentam esta aproximação?

    Directory of Open Access Journals (Sweden)

    Welles Matias de Abreu

    2013-04-01

    Full Text Available A finalidade do presente trabalho é analisar as características do processo orçamentário brasileiro diante da perspectiva do planejamento emancipatório. Para tanto, são utilizadas as teorias sobre formulação estratégica, orçamento público, planejamento emancipatório e desenvolvimentismo. A metodologia utilizada para o estudo do caso em questão é do tipo qualitativo descritivo, com características ontológicas construtivistas e epistemológicas interpretacionistas. Os dados são coletados por meio de pesquisas bibliográficas e documentais, além da realização de entrevistas abertas. Os dados oriundos das entrevistas estão agrupados em categorias para análises de conteúdo e realização de triangulações com os dados provenientes das pesquisas bibliográficas e documentais. São apresentados os resultados das análises com relação às características do orçamento brasileiro, discriminando suas evidências e oportunidades, sob a perspectiva emancipatória. Assim, mesmo com a conclusão de que o orçamento público brasileiro não poderia ser considerado emancipatório, pode-se identificar a existência de diversas características emancipatórias, bem como várias oportunidades que podem ser desenvolvidas no orçamento brasileiro. Por fim, registra-se que esta pesquisa contribui com a produção de conhecimento na área da teoria do planejamento, uma vez que apresenta evidências empíricas da teoria do planejamento emancipatório no processo orçamentário brasileiro, sendo uma iniciativa pioneira no Brasil de estudo sobre emancipação orçamentária.

  20. Gestão de risco e os impactos da instrução normativa CVM nº 550: análise empírica Risk management and the effects of CVM instruction 550: empirical analysis

    Directory of Open Access Journals (Sweden)

    Leonardo Andrade de Almeida Burlá

    2010-08-01

    Full Text Available Este trabalho analisa o efeito da instrução normativa CVM 550 sobre a utilização de derivativos e, consequentemente, a gestão de risco das companhias abertas brasileiras. A resolução exige que as empresas apurem por meio do valor de mercado os instrumentos derivativos em suas demonstrações financeiras trimestrais. No entanto, a deliberação não prevê tratamento contábil para tais tipos de instrumentos. Assim, é suposto que o efeito da norma deve afetar dois grupos de usuários de derivativos: os hedgers (EH e os especuladores (IS. Os resultados empíricos mostram que o risco incorrido pelas empresas se refere, basicamente, à taxa de juros e câmbio. Após a adoção da norma, foram encontradas evidências estatísticas que apontam uma diminuição do uso de derivativos para ambos os grupos. As evidências sugerem que a resolução 550 tem incentivado as empresas a contratarem derivativos com mais prudência, o que indica uma mudança na política de gestão de risco. Para o estudo em questão foi utilizada uma amostra de 107 empresas brasileiras pertencentes aos 10 grandes setores econômicos do ICB, em uma janela de dados de 10 anos (1999 a 2009.The present study examines the effect of CVM normative instruction 550 on the use of derivatives and, consequently, on the risk management of Brazilian companies. The instruction requires companies to disclose the fair value of derivative instruments in their quarterly financial statements. However, this resolution does not establish on the accounting treatment for these types of instruments. Thus, it is supposed that the rule should affect both groups of derivatives users, hedgers (EH and speculators (IS. The empirical results show that the risk the companies incur basically refers to the interest rate and exchange rate. After the adoption of the instruction, statistical evidence was found that shows a decrease in derivative use for both groups. The evidence suggests that instruction 550

  1. Orientación empática de los estudiantes de dos escuelas de kinesiología de Chile Empathetic orientation of the physical therapist's students from two schools of Chile

    Directory of Open Access Journals (Sweden)

    A.M. Rojas-Serey

    2009-06-01

    Full Text Available Objetivo. Conocer la orientación empática de los alumnos de la carrera de kinesiología de dos escuelas de la región metropolitana. Sujetos y métodos. Este trabajo corresponde a una investigación analítica de corte transversal realizada entre los meses de marzo y noviembre del año 2006. Participaron 274 alumnos de un universo de 351 correspondientes a los niveles I, III y V de la carrera de kinesiología de la Universidad de Chile y la Universidad Mayor. Se aplicó la escala de empatía médica de Jefferson (EEMJ. Para el análisis de los datos, se utilizó la prueba U no paramétrica de Wilcoxon-Mann-Whitney y la prueba no paramétrica de Kruskal-Wallis. Resultados. Se obtuvieron mayores puntuaciones en la EEMJ con significación estadística en el tercer y quinto nivel de la carrera con relación al primero (p Aim. To know the empathetic orientation of the physical therapist's students in two schools of the metropolitan region. Subjects and methods. This work is an analytical cross-sectional research, carried out between the months on March and November, 2006. 274 out of 351 students participated, who belonged to the levels I, III and V of the Universidad de Chile and Universidad Mayor Physical Therapy Programs. The Jefferson Scale of Physician Empathy (JSPE was applied. For data analysis, the non-parametrical Wilcoxon-Mann-Whitney test and the non-parametrical Kruskal-Wallis test were used. Results. Higher scores in the JSPE with statistical significance were obtained in the third and fifth level of the program compared with the first one (p < 0.05. No significant differences were found in the scores related to gender. Conclusions. There exists higher scores obtained in the JSPE in students who are in more advanced levels of the Physical Therapy Program, being this difference significant in both universities. The scores obtained in the JSPE do not have statistical significance in relation to the variable gender in both universities.

  2. Aceptabilidad del tratamiento "empírico" de la infección urinaria aguda en el niño Acceptability of the "empirical" treatment of acute urinary infection in children

    Directory of Open Access Journals (Sweden)

    Sandalio Durán Álvarez

    2011-03-01

    Full Text Available Las guías propuestas por grupos internacionales enfatizan en la importancia del diagnóstico de la infección del tracto urinario en la atención primaria de salud, para poder iniciar un tratamiento precoz con antibióticos en los casos de mayor riesgo. El médico de atención primaria en ocasiones realiza su trabajo lejos de los laboratorios de microbiología y no puede realizar el urocultivo con la rapidez necesaria para un tratamiento adecuado. Este médico necesita disponer de pruebas diagnósticas rápidas que le ayuden a tomar la decisión médica más adecuada, aunque ninguna combinación de ellas puede sustituir al urocultivo. En esta propuesta se analizan las situaciones en las que el médico debe esperar el resultado del estudio bacteriológico y en las que puede iniciar un tratamiento «empírico» después de tomar la muestra para el urocultivo, si este puede realizarse. En los casos excepcionales de imposibilidad de realizar el estudio bacteriológico, el médico tiene que actuar utilizando los llamados métodos de «diagnóstico rápido».The guidances proposed for international groups emphasize the significance of diagnosis of the urinary tract infection in primary health care to start an early antibiotics treatment in cases of a major risk. The primary care physician sometimes works far from the microbiology laboratories and can not to carry out a fast uroculture for an appropriate treatment. This physician needs to have available fast diagnostic tests helping him to make a more suitable medical decision, although any combination of them may to replace the uroculture. In present proposal are analyzed those situations where the physician must to await for bacteriological study results to start the "empirical" treatment after the sample take for uroculture if it may to be carry out. In exceptional cases of impossibility to conduct the bacteriological study, the physician must to act using the so called "fast diagnosis" methods.

  3. Measuring neutrino oscillation parameters using $\

    Energy Technology Data Exchange (ETDEWEB)

    Backhouse, Christopher James [Oriel College, Oxford (United Kingdom)

    2011-01-01

    MINOS is a long-baseline neutrino oscillation experiment. It consists of two large steel-scintillator tracking calorimeters. The near detector is situated at Fermilab, close to the production point of the NuMI muon-neutrino beam. The far detector is 735 km away, 716m underground in the Soudan mine, Northern Minnesota. The primary purpose of the MINOS experiment is to make precise measurements of the 'atmospheric' neutrino oscillation parameters (Δmatm2 and sin2atm). The oscillation signal consists of an energy-dependent deficit of vμ interactions in the far detector. The near detector is used to characterize the properties of the beam before oscillations develop. The two-detector design allows many potential sources of systematic error in the far detector to be mitigated by the near detector observations. This thesis describes the details of the vμ-disappearance analysis, and presents a new technique to estimate the hadronic energy of neutrino interactions. This estimator achieves a significant improvement in the energy resolution of the neutrino spectrum, and in the sensitivity of the neutrino oscillation fit. The systematic uncertainty on the hadronic energy scale was re-evaluated and found to be comparable to that of the energy estimator previously in use. The best-fit oscillation parameters of the vμ-disappearance analysis, incorporating this new estimator were: Δm2 = 2.32-0.08+0.12 x 10-3 eV2, sin 2 2θ > 0.90 (90% C.L.). A similar analysis, using data from a period of running where the NuMI beam was operated in a configuration producing a predominantly $\\bar{v}$μ beam, yielded somewhat different best-fit parameters Δ$\\bar{m}${sup 2} = (3.36-0.40+0.46(stat.) ± 0.06(syst.)) x 10-3eV2, sin2 2$\\bar{θ}$ = 0.86-0.12_0

  4. A Generic Approach to Parameter Control

    NARCIS (Netherlands)

    Karafotias, G.; Smit, S.K.; Eiben, A.E.

    2012-01-01

    On-line control of EA parameters is an approach to parameter setting that offers the advantage of values changing during the run. In this paper, we investigate parameter control from a generic and parameter-independent perspective. We propose a generic control mechanism that is targeted to

  5. Comet Halley, parameter study I

    International Nuclear Information System (INIS)

    Huebner, W.F.; Fikani, M.M.

    1982-06-01

    To aid in defining a mission to comet P/Halley, its inner coma is simulated by a computer program that models time-dependent chemical reactions in a radially and isentropically expanding gas, taking into account attenuation of solar ultraviolet radiation in the subsolar direction. Column density predictions are based on intelligently selected combinations of poorly known values for nucleus parameters that include size, visual albedo, and infrared emissivity. Only one chemical composition and a minor modification of it are considered here; the dust-to-gas ratio in this model is zero. Although the somewhat optimistically volatile composition chosen here favors a smaller nucleus, a mean nuclear radius of only 0.5 km is unlikely. No significant increase of molecular column density is predicted by this model as a spacecraft approaches, once it is less than a few 10 4 km from the nucleus. Predictions are made for various heliocentric distances of interest for comet missions and for ground observations

  6. Image-based petrophysical parameters

    DEFF Research Database (Denmark)

    Noe-Nygaard, Jakob; Engstrøm, Finn; Sølling, Theis Ivan

    2017-01-01

    run directly from the micro-CT results on a cutting measured on an in-house instrument; the results clearly show that micro-CT measurements on chalk do not capture the pore space with sufficient detail to be predictive. Overall, with the appropriate resolution, the present study shows......-computed-tomography (nano-CT) images of trim sections and cuttings. Moreover, the trim-section results are upscaled to trim size to form the basis of an additional comparison. The results are also benchmarked against conventional core analysis (CCAL) results on trim-size samples. The comparison shows that petrophysical...... parameters from CT imaging agree reasonably well with those determined experimentally. The upscaled results show some discrepancy with the nano-CT results, particularly in the case of the low-permeability plug. This is probably because of the challenge in finding a representative subvolume. For the cuttings...

  7. Data Handling and Parameter Estimation

    DEFF Research Database (Denmark)

    Sin, Gürkan; Gernaey, Krist

    2016-01-01

    ,engineers, and professionals. However, it is also expected that they will be useful both for graduate teaching as well as a stepping stone for academic researchers who wish to expand their theoretical interest in the subject. For the models selected to interpret the experimental data, this chapter uses available models from...... literature that are mostly based on the ActivatedSludge Model (ASM) framework and their appropriate extensions (Henze et al., 2000).The chapter presents an overview of the most commonly used methods in the estimation of parameters from experimental batch data, namely: (i) data handling and validation, (ii......Modelling is one of the key tools at the disposal of modern wastewater treatment professionals, researchers and engineers. It enables them to study and understand complex phenomena underlying the physical, chemical and biological performance of wastewater treatment plants at different temporal...

  8. Practice parameter on disaster preparedness.

    Science.gov (United States)

    Pfefferbaum, Betty; Shaw, Jon A

    2013-11-01

    This Practice Parameter identifies best approaches to the assessment and management of children and adolescents across all phases of a disaster. Delivered within a disaster system of care, many interventions are appropriate for implementation in the weeks and months after a disaster. These include psychological first aid, family outreach, psychoeducation, social support, screening, and anxiety reduction techniques. The clinician should assess and monitor risk and protective factors across all phases of a disaster. Schools are a natural site for conducting assessments and delivering services to children. Multimodal approaches using social support, psychoeducation, and cognitive behavioral techniques have the strongest evidence base. Psychopharmacologic interventions are not generally used but may be necessary as an adjunct to other interventions for children with severe reactions or coexisting psychiatric conditions. Copyright © 2013. Published by Elsevier Inc.

  9. Stellar Parameters for Trappist-1

    Science.gov (United States)

    Van Grootel, Valérie; Fernandes, Catarina S.; Gillon, Michael; Jehin, Emmanuel; Manfroid, Jean; Scuflaire, Richard; Burgasser, Adam J.; Barkaoui, Khalid; Benkhaldoun, Zouhair; Burdanov, Artem; Delrez, Laetitia; Demory, Brice-Olivier; de Wit, Julien; Queloz, Didier; Triaud, Amaury H. M. J.

    2018-01-01

    TRAPPIST-1 is an ultracool dwarf star transited by seven Earth-sized planets, for which thorough characterization of atmospheric properties, surface conditions encompassing habitability, and internal compositions is possible with current and next-generation telescopes. Accurate modeling of the star is essential to achieve this goal. We aim to obtain updated stellar parameters for TRAPPIST-1 based on new measurements and evolutionary models, compared to those used in discovery studies. We present a new measurement for the parallax of TRAPPIST-1, 82.4 ± 0.8 mas, based on 188 epochs of observations with the TRAPPIST and Liverpool Telescopes from 2013 to 2016. This revised parallax yields an updated luminosity of {L}* =(5.22+/- 0.19)× {10}-4 {L}ȯ , which is very close to the previous estimate but almost two times more precise. We next present an updated estimate for TRAPPIST-1 stellar mass, based on two approaches: mass from stellar evolution modeling, and empirical mass derived from dynamical masses of equivalently classified ultracool dwarfs in astrometric binaries. We combine them using a Monte-Carlo approach to derive a semi-empirical estimate for the mass of TRAPPIST-1. We also derive estimate for the radius by combining this mass with stellar density inferred from transits, as well as an estimate for the effective temperature from our revised luminosity and radius. Our final results are {M}* =0.089+/- 0.006 {M}ȯ , {R}* =0.121+/- 0.003 {R}ȯ , and {T}{eff} = 2516 ± 41 K. Considering the degree to which the TRAPPIST-1 system will be scrutinized in coming years, these revised and more precise stellar parameters should be considered when assessing the properties of TRAPPIST-1 planets.

  10. GPS User Devices Parameter Control Methods

    OpenAIRE

    Klūga, A; Kuļikovs, M; Beļinska, V; Zeļenkovs, A

    2007-01-01

    In our day’s wide assortment of GPS user devices is manufacture. How to verify that parameters of the real device corresponds to parameters that manufacture shows. How to verify that parameters have not been changed during the operation time. The last one is very important for aviation GPS systems, which must be verified before the flight, but the values of parameter in time of repair works. This work analyses GPS user devices parameters control methods.

  11. Applied parameter estimation for chemical engineers

    CERN Document Server

    Englezos, Peter

    2000-01-01

    Formulation of the parameter estimation problem; computation of parameters in linear models-linear regression; Gauss-Newton method for algebraic models; other nonlinear regression methods for algebraic models; Gauss-Newton method for ordinary differential equation (ODE) models; shortcut estimation methods for ODE models; practical guidelines for algorithm implementation; constrained parameter estimation; Gauss-Newton method for partial differential equation (PDE) models; statistical inferences; design of experiments; recursive parameter estimation; parameter estimation in nonlinear thermodynam

  12. Radon parameters in outdoor air

    International Nuclear Information System (INIS)

    Porstendoerfer, J.; Zock, Ch.; Wendt, J.; Reineking, A.

    2002-01-01

    For dose estimation by inhalation of the short lived radon progeny in outdoor air, the equilibrium factor (F), the unattached fraction (f p ), and the activity size distribution of the radon progeny were measured. Besides the radon parameter the meteorological parameter like temperature, wind speed, and rainfall intensity were registered. The measurements were carried out continuously for several weeks to find out the variation with time (day/night) and for different weather conditions. The radon gas, the unattached and aerosol-attached radon progenies were measured with an monitor developed for continuous measurements in outdoor air with low activity concentrations. For the determination of the activity size distribution a low pressure online alpha cascade impactor was used. The measured values of the equilibrium factor varied between 0.5-0.8 depending on weather conditions and time of the day. For high pressure weather conditions a diurnal variation of the F-factor was obtained. A lower average value (F=0.25) was registered during rainy days. The obtained f p -values varied between 0.04 and 0.12. They were higher than expected. The measured activity size distribution of the radon progeny averaged over a measurement period of three weeks can be approximated by a sum of three log-normal distributions. The greatest activity fraction is adsorbed on aerosol particles in the accumulation size range (100-1000 nm) with activity median diameters and geometric standard deviation values between 250-450 nm and 1.5-3.0, respectively. The activity median diameter of this accumulation mode in outdoor air was significantly greater than in indoor air (150-250 nm). An influence of the weather conditions on the activity of the accumulation particles was not significant. In contrast to the results of measurements in houses a small but significant fraction of the radon progeny (average value: 2%) is attached on coarse particles (>1000 nm). This fraction varied between 0-10%. 20

  13. Voltage stability, bifurcation parameters and continuation methods

    Energy Technology Data Exchange (ETDEWEB)

    Alvarado, F L [Wisconsin Univ., Madison, WI (United States)

    1994-12-31

    This paper considers the importance of the choice of bifurcation parameter in the determination of the voltage stability limit and the maximum power load ability of a system. When the bifurcation parameter is power demand, the two limits are equivalent. However, when other types of load models and bifurcation parameters are considered, the two concepts differ. The continuation method is considered as a method for determination of voltage stability margins. Three variants of the continuation method are described: the continuation parameter is the bifurcation parameter the continuation parameter is initially the bifurcation parameter, but is free to change, and the continuation parameter is a new `arc length` parameter. Implementations of voltage stability software using continuation methods are described. (author) 23 refs., 9 figs.

  14. Kinematic parameters of signed verbs.

    Science.gov (United States)

    Malaia, Evie; Wilbur, Ronnie B; Milkovic, Marina

    2013-10-01

    Sign language users recruit physical properties of visual motion to convey linguistic information. Research on American Sign Language (ASL) indicates that signers systematically use kinematic features (e.g., velocity, deceleration) of dominant hand motion for distinguishing specific semantic properties of verb classes in production ( Malaia & Wilbur, 2012a) and process these distinctions as part of the phonological structure of these verb classes in comprehension ( Malaia, Ranaweera, Wilbur, & Talavage, 2012). These studies are driven by the event visibility hypothesis by Wilbur (2003), who proposed that such use of kinematic features should be universal to sign language (SL) by the grammaticalization of physics and geometry for linguistic purposes. In a prior motion capture study, Malaia and Wilbur (2012a) lent support for the event visibility hypothesis in ASL, but there has not been quantitative data from other SLs to test the generalization to other languages. The authors investigated the kinematic parameters of predicates in Croatian Sign Language ( Hrvatskom Znakovnom Jeziku [HZJ]). Kinematic features of verb signs were affected both by event structure of the predicate (semantics) and phrase position within the sentence (prosody). The data demonstrate that kinematic features of motion in HZJ verb signs are recruited to convey morphological and prosodic information. This is the first crosslinguistic motion capture confirmation that specific kinematic properties of articulator motion are grammaticalized in other SLs to express linguistic features.

  15. Morfofunctional parameters in judo's fight

    Directory of Open Access Journals (Sweden)

    Ítalo Sérgio Lopes Campos

    2017-12-01

    Full Text Available Considering the complexity of judo and the ample energy and neuromuscular demands, a whole process of competitive preparation must be directed to different physical capacities allowing the athlete to perform his combat actions with the best suitability possible. Mapping the  behaviour of a judo athlete from observations of behaviour units  in a real fighting situation would be a way of trying to identify the best topography or the best "aptitude" to achieve victory. The present investigation analysed the judo from the interactions of a real competition situation, aiming to verify, between winners and losers, possible differences or correlations between anthropometric parameters, motor performance and functional behaviours in a competitive situation. The results showed that: a the experience is decisive between winning or losing; b leg techniques are the most used between winners and losers, and losers use them more frequently; c there are different strategies between fights; d The energy cost in judo depends on the configuration of the fights. It is believed that such results can help coaches and athletes in guiding and rationalizing the training process in relation to performance determinants in judo.

  16. O orçamento público brasileiro e a perspectiva emancipatória: existem evidências empíricas que sustentam esta aproximação? El presupuesto público brasileño y la perspectiva emancipadora: hay prueba empírica que apoya este enfoque? The Brazilian public budget and the emancipatory perspective: is there any empirical evidence supporting this approach?

    Directory of Open Access Journals (Sweden)

    Welles Matias de Abreu

    2013-04-01

    Full Text Available A finalidade do presente trabalho é analisar as características do processo orçamentário brasileiro diante da perspectiva do planejamento emancipatório. Para tanto, são utilizadas as teorias sobre formulação estratégica, orçamento público, planejamento emancipatório e desenvolvimentismo. A metodologia utilizada para o estudo do caso em questão é do tipo qualitativo descritivo, com características ontológicas construtivistas e epistemológicas interpretacionistas. Os dados são coletados por meio de pesquisas bibliográficas e documentais, além da realização de entrevistas abertas. Os dados oriundos das entrevistas estão agrupados em categorias para análises de conteúdo e realização de triangulações com os dados provenientes das pesquisas bibliográficas e documentais. São apresentados os resultados das análises com relação às características do orçamento brasileiro, discriminando suas evidências e oportunidades, sob a perspectiva emancipatória. Assim, mesmo com a conclusão de que o orçamento público brasileiro não poderia ser considerado emancipatório, pode-se identificar a existência de diversas características emancipatórias, bem como várias oportunidades que podem ser desenvolvidas no orçamento brasileiro. Por fim, registra-se que esta pesquisa contribui com a produção de conhecimento na área da teoria do planejamento, uma vez que apresenta evidências empíricas da teoria do planejamento emancipatório no processo orçamentário brasileiro, sendo uma iniciativa pioneira no Brasil de estudo sobre emancipação orçamentária.El propósito de este trabajo es analizar las características Del proceso presupuestario brasileño ante la perspectiva de la planificación de la emancipación. Para tanto, se utilizan teorías sobre la formulación de estrategias, presupuesto público, la planificación y el desarrollismo emancipador. La metodología utilizada para el estudio del caso en cuestión es del

  17. Statistics of Parameter Estimates: A Concrete Example

    KAUST Repository

    Aguilar, Oscar; Allmaras, Moritz; Bangerth, Wolfgang; Tenorio, Luis

    2015-01-01

    © 2015 Society for Industrial and Applied Mathematics. Most mathematical models include parameters that need to be determined from measurements. The estimated values of these parameters and their uncertainties depend on assumptions made about noise

  18. Parameter Estimation of Partial Differential Equation Models

    KAUST Repository

    Xun, Xiaolei; Cao, Jiguo; Mallick, Bani; Maity, Arnab; Carroll, Raymond J.

    2013-01-01

    PDEs used in practice have no analytic solutions, and can only be solved with numerical methods. Currently, methods for estimating PDE parameters require repeatedly solving PDEs numerically under thousands of candidate parameter values, and thus

  19. The parameter spreadsheets and their applications

    International Nuclear Information System (INIS)

    Schwitters, R.; Chao, A.; Chou, W.; Peterson, J.

    1993-01-01

    This paper is to announce that a set of parameter spreadsheets, using the Microsoft EXCEL software, has been developed for the SSC (and also for the LHC). In this program, the input (or control) parameters and the derived parameters are linked by equations that express the accelerator physics involved. A subgroup of parameters that are considered critical, or possible bottlenecks, has been highlighted under the category of open-quotes Flagsclose quotes. Given certain performance goals, one can use this program to open-quotes tuneclose quotes the input parameters in such a way that the flagged parameters do not exceed their acceptable range. During the past years, this program has been employed for the following purposes: (a) To guide the machine designs for various operation scenarios, (b) To generate a parameter list that is self-consistent and, (c) To study the impact of some proposed parameter changes (e.g., different choices of the rf frequency and bunch spacing)

  20. Physiological Parameters Database for Older Adults

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Physiological Parameters Database for Older Adults is available for download and contains physiological parameters values for healthy older human adults (age 60...

  1. Hacia una teoría sobre el rendimiento académico en enseñanza primaria a partir de la investigación empírica: datos preliminares

    Directory of Open Access Journals (Sweden)

    Santiago NIETO MARTÍN

    2009-01-01

    Full Text Available RESUMEN: La investigación educativa sobre el rendimiento académico ha formado parte de una constante de indagación y conocimiento sobre el tema durante los últimos treinta años en nuestro país. Sin embargo, el gran volumen de trabajo acumulado no parece haber contribuido suficientemente a la creación de una teoría consistente sobre el rendimiento académico, y, mucho menos, haber seguido la estela de exigencia que comporta la creación de teorías científicas sobre la cuestión. Se produce la constatación de gran cantidad de tendencias, pero no se establecen conocimientos de mayor alcance dadas las limitaciones de los diseños metodológicos bajo los que se han llevado a cabo la mayoría de las investigaciones. Ante esta situación, proponemos la consecución de las denominadas teorías de alcance intermedio con el fin de desarrollar un esquema conceptual progresivo más general que promueva la consolidación de grupos de teorías especiales, de las cuales derivar hipótesis que se puedan investigar empíricamente con mayor profundidad.ABSTRACT: Educational research into academic performance has formed part of a constant subject of study in the last thirty years in Spain. However, the large volume of work that has been accumulated does not seem to have contributed sufficiently to the creation of a coherent theory of academic performance, and much less to have followed the path demanded of scientific theories on the matter. A large amount of trends are confirmed, but knowledge of a broader scope has not been established given the limitations of the methodological designs under which most of the research has been carried out. Faced with this situation, we propose to attain so-called middle range theories in order to develop a more general progressive conceptual scheme to promote the consolidation of groups of special theories from which to derive hypotheses that can be investigated empirically in greater depth.SOMMAIRE: Depuis les ann

  2. Empirical models to predict soil nitrogen mineralization Modelos empíricos para a predição da mineralização do nitrogênio do solo

    Directory of Open Access Journals (Sweden)

    Flávio Anastácio de Oliveira Camargo

    2002-06-01

    Full Text Available Empirical models are mathematical equations that can be fitted to experimental results. The use of these models aims to evaluate or predict observed phenomena or experimental data with the objective of helping the development of adequate soil management practices. Based on these considerations, eight mathematical models described in the literature are compared in the present work, using as experimental data the mineral N accumulated during 32 weeks of incubation in Southern Brazilian soils. To obtain mineralization values experimentally, an incubation-washing procedure with 0.01mol L-1 CaCl2 was used. Mineral N was determined at the beginning of the incubation and in the 2nd, 4th, 8th, 16th and 32nd weeks. Among the models, the best fit was obtained with the simple exponential model to describe the mineralization of organic N in the soils. The double exponential models showed quite good fit, but may be superparametrized. In addition, the hypothesis on which these models are based, i.e., the presence of two forms of organic N susceptible to mineralization, cannot be sustained in this study.Modelos empíricos são equações matemáticas que podem ser ajustadas a resultados experimentais. Esses modelos podem ser utilizados para avaliar ou predizer fenômenos observados ou dados experimentais e auxiliar no desenvolvimento de práticas adequadas de manejo do solo. Desse modo, o presente trabalho teve por objetivo comparar oito modelos matemáticos descritos na literatura, utilizando como dados experimentais o N mineralizado de dez solos do Rio Grande do Sul, acumulado durante 32 semanas de incubação. O N mineralizado foi obtido experimentalmente em um experimento de incubação, seguido de lixiviação com CaCl2 0,01mol L-1. O N mineral foi determinado no começo do período de incubação e ao final da 2ª, 4ª, 8ª, 16ª e 32ª semanas. Entre os modelos testados, o melhor ajuste do N mineralizado foi obtido com os modelos exponenciais simples

  3. O endosso por celebridade e a gestão da imagem da marca: evidências empíricas a partir do estudo da marca Ipanema Gisele Bündchen

    Directory of Open Access Journals (Sweden)

    Giancarlo Dal Bó

    2012-12-01

    Full Text Available Um conceito fundamental para a compreensão do papel desempenhado pelas marcas nas sociedades é o de posicionamento. De acordo com Ries e Trout (1986, o enfoque essencial do posicionamento não está em criar algo novo ou diferente, e sim em reconhecer o que está dentro da mente dos consumidores e posicionar o produto valendo-se das conexões existentes. Uma abordagem que tem despertado interesse é o paradigma do arquétipo, que postula a exist��ncia do inconsciente coletivo, uma estrutura da psiqué que conteria as "imagens coletivas" comuns ao gênero humano que representam uma tendência inata para perceber a realidade de uma determinada forma. Neste sentido, pesquisadores propõem que a utilização de celebridades endossantes é uma forma poderosa de transferir significados simbólicos para as marcas. Assim sendo, este estudo integra os conceitos da Teoria dos Arquétipos de Jung e de posicionamento de marca, tendo como objetivo compreender como uma empresa realiza o processo de transferência do significado simbólico proveniente de uma celebridade endossante para a imagem de uma marca, dotando-as dos elementos arquetípicos que possibilitem a conexão entre a imagem da marca e as inclinações psicológicas dos consumidores, resultando em um posicionamento de marca efetivo. Para tanto, foi desenvolvida uma pesquisa exploratória relacionada às estratégias de posicionamento adotadas para a marca Ipanema Gisele Bündchen, por meio da qual foi possível compreender de que forma ocorre a transferência do significado simbólico de uma celebridade para a imagem da marca, resultando em considerações teóricas e empíricas capazes de oferecer suporte aos processos estratégicos e gerenciais de posicionamento de marca.A key concept for understanding the role of brands in societies is the positioning. According to Ries and Trout (1986, the focus of the position is not essential in creating something new or different, but to recognize

  4. Podemos prever a taxa de cambio brasileira? Evidência empírica utilizando inteligência computacional e modelos econométricos Can we forecast Brazilian exchange rates? Empirical evidences using computational intelligence and econometric models

    Directory of Open Access Journals (Sweden)

    Leandro dos Santos Coelho

    2008-12-01

    Full Text Available As abordagens de inteligência computacional, tais como sistemas nebulosos e redes neurais artificiais, têm-se gradualmente estabelecido como ferramentas robustas para a tarefa de aproximação de sistemas não-lineares complexos e previsão de séries temporais. Em aplicações envolvendo a área de Finanças, evidências empíricas anteriores indicam que modelos de inteligência computacional são mais precisos, dada sua maior capacidade em capturar não-linearidades e outros fatos estilizados presentes em séries financeiras. Nesse sentido, este artigo investiga a hipótese de que os modelos matemáticos de redes neurais perceptron multicamadas, redes neurais função de base radial e o sistema nebuloso Takagi-Sugeno (TAKAGI; SUGENO, 1985 são capazes de fornecer uma previsão fora-da-amostra mais acurada que os modelos auto-regressivos de médias móveis (ARMA e auto-regressivo de médias móveis supondo heterocedasticidade condicional auto-regressiva (ARMA-GARCH. O desempenho de previsão um-passo-à-frente dos modelos foi comparado utilizando-se séries de retorno da taxa de câmbio real/dólar (R$/US$ com freqüências de 15 minutos, 60 minutos, 120 minutos, diária e semanal. Resultados indicam que o desempenho dos modelos está diretamente relacionado à freqüência observada das séries. Além disso, os modelos de redes neurais obtiveram um desempenho superior em relação aos demais modelos considerados. A avaliação da estratégia de negociação estabelecida com base nas previsões geradas pelos modelos indicou que estratégias baseadas em modelos de redes neurais forneceram retornos superiores em relação àquelas baseadas em modelos ARMA e ARMA-GARCH e também em relação à estratégia buy-and-hold.Computational intelligence approaches, such as artificial neural networks and fuzzy systems, have become popular tools in approximating complicated nonlinear systems and time series forecasting. In Finance applications, there is

  5. Behavioural Pattern of Causality Parameter of Autoregressive ...

    African Journals Online (AJOL)

    In this paper, a causal form of Autoregressive Moving Average process, ARMA (p, q) of various orders and behaviour of the causality parameter of ARMA model is investigated. It is deduced that the behaviour of causality parameter ψi depends on positive and negative values of autoregressive parameter φ and moving ...

  6. Recovering Parameters of Johnson's SB Distribution

    Science.gov (United States)

    Bernard R. Parresol

    2003-01-01

    A new parameter recovery model for Johnson's SB distribution is developed. This latest alternative approach permits recovery of the range and both shape parameters. Previous models recovered only the two shape parameters. Also, a simple procedure for estimating the distribution minimum from sample values is presented. The new methodology...

  7. Parameters Evaluation of PLC Dependability and Safety

    Directory of Open Access Journals (Sweden)

    Juraj Zdansky

    2006-01-01

    Full Text Available This paper is focused on evaluation of dependability and safety parameters of PLC (Programmable Logic Controller. Achievement of requested level of these parameters is an application assumption for using PLC in control of safety critical processes. Evaluation of these parameters can be made on the base of suitable model and it can be influenced by system architecture when necessary.

  8. Establishing statistical models of manufacturing parameters

    International Nuclear Information System (INIS)

    Senevat, J.; Pape, J.L.; Deshayes, J.F.

    1991-01-01

    This paper reports on the effect of pilgering and cold-work parameters on contractile strain ratio and mechanical properties that were investigated using a large population of Zircaloy tubes. Statistical models were established between: contractile strain ratio and tooling parameters, mechanical properties (tensile test, creep test) and cold-work parameters, and mechanical properties and stress-relieving temperature

  9. A comparison between two powder compaction parameters of plasticity: the effective medium A parameter and the Heckel 1/K parameter.

    Science.gov (United States)

    Mahmoodi, Foad; Klevan, Ingvild; Nordström, Josefina; Alderborn, Göran; Frenning, Göran

    2013-09-10

    The purpose of the research was to introduce a procedure to derive a powder compression parameter (EM A) representing particle yield stress using an effective medium equation and to compare the EM A parameter with the Heckel compression parameter (1/K). 16 pharmaceutical powders, including drugs and excipients, were compressed in a materials testing instrument and powder compression profiles were derived using the EM and Heckel equations. The compression profiles thus obtained could be sub-divided into regions among which one region was approximately linear and from this region, the compression parameters EM A and 1/K were calculated. A linear relationship between the EM A parameter and the 1/K parameter was obtained with a strong correlation. The slope of the plot was close to 1 (0.84) and the intercept of the plot was small in comparison to the range of parameter values obtained. The relationship between the theoretical EM A parameter and the 1/K parameter supports the interpretation of the empirical Heckel parameter as being a measure of yield stress. It is concluded that the combination of Heckel and EM equations represents a suitable procedure to derive a value of particle plasticity from powder compression data. Copyright © 2013 Elsevier B.V. All rights reserved.

  10. Cosmological parameter estimation using Particle Swarm Optimization

    Science.gov (United States)

    Prasad, J.; Souradeep, T.

    2014-03-01

    Constraining parameters of a theoretical model from observational data is an important exercise in cosmology. There are many theoretically motivated models, which demand greater number of cosmological parameters than the standard model of cosmology uses, and make the problem of parameter estimation challenging. It is a common practice to employ Bayesian formalism for parameter estimation for which, in general, likelihood surface is probed. For the standard cosmological model with six parameters, likelihood surface is quite smooth and does not have local maxima, and sampling based methods like Markov Chain Monte Carlo (MCMC) method are quite successful. However, when there are a large number of parameters or the likelihood surface is not smooth, other methods may be more effective. In this paper, we have demonstrated application of another method inspired from artificial intelligence, called Particle Swarm Optimization (PSO) for estimating cosmological parameters from Cosmic Microwave Background (CMB) data taken from the WMAP satellite.

  11. Cosmological parameter estimation using Particle Swarm Optimization

    International Nuclear Information System (INIS)

    Prasad, J; Souradeep, T

    2014-01-01

    Constraining parameters of a theoretical model from observational data is an important exercise in cosmology. There are many theoretically motivated models, which demand greater number of cosmological parameters than the standard model of cosmology uses, and make the problem of parameter estimation challenging. It is a common practice to employ Bayesian formalism for parameter estimation for which, in general, likelihood surface is probed. For the standard cosmological model with six parameters, likelihood surface is quite smooth and does not have local maxima, and sampling based methods like Markov Chain Monte Carlo (MCMC) method are quite successful. However, when there are a large number of parameters or the likelihood surface is not smooth, other methods may be more effective. In this paper, we have demonstrated application of another method inspired from artificial intelligence, called Particle Swarm Optimization (PSO) for estimating cosmological parameters from Cosmic Microwave Background (CMB) data taken from the WMAP satellite

  12. Robust estimation of hydrological model parameters

    Directory of Open Access Journals (Sweden)

    A. Bárdossy

    2008-11-01

    Full Text Available The estimation of hydrological model parameters is a challenging task. With increasing capacity of computational power several complex optimization algorithms have emerged, but none of the algorithms gives a unique and very best parameter vector. The parameters of fitted hydrological models depend upon the input data. The quality of input data cannot be assured as there may be measurement errors for both input and state variables. In this study a methodology has been developed to find a set of robust parameter vectors for a hydrological model. To see the effect of observational error on parameters, stochastically generated synthetic measurement errors were applied to observed discharge and temperature data. With this modified data, the model was calibrated and the effect of measurement errors on parameters was analysed. It was found that the measurement errors have a significant effect on the best performing parameter vector. The erroneous data led to very different optimal parameter vectors. To overcome this problem and to find a set of robust parameter vectors, a geometrical approach based on Tukey's half space depth was used. The depth of the set of N randomly generated parameters was calculated with respect to the set with the best model performance (Nash-Sutclife efficiency was used for this study for each parameter vector. Based on the depth of parameter vectors, one can find a set of robust parameter vectors. The results show that the parameters chosen according to the above criteria have low sensitivity and perform well when transfered to a different time period. The method is demonstrated on the upper Neckar catchment in Germany. The conceptual HBV model was used for this study.

  13. Multi-Objective Parameter Selection for Classifers

    Directory of Open Access Journals (Sweden)

    Christoph Mussel

    2012-01-01

    Full Text Available Setting the free parameters of classifiers to different values can have a profound impact on their performance. For some methods, specialized tuning algorithms have been developed. These approaches mostly tune parameters according to a single criterion, such as the cross-validation error. However, it is sometimes desirable to obtain parameter values that optimize several concurrent - often conflicting - criteria. The TunePareto package provides a general and highly customizable framework to select optimal parameters for classifiers according to multiple objectives. Several strategies for sampling andoptimizing parameters are supplied. The algorithm determines a set of Pareto-optimal parameter configuration and leaves the ultimate decision on the weighting of objectives to the researcher. Decision support is provided by novel visualization techniques.

  14. Optimization of Parameters of Asymptotically Stable Systems

    Directory of Open Access Journals (Sweden)

    Anna Guerman

    2011-01-01

    Full Text Available This work deals with numerical methods of parameter optimization for asymptotically stable systems. We formulate a special mathematical programming problem that allows us to determine optimal parameters of a stabilizer. This problem involves solutions to a differential equation. We show how to chose the mesh in order to obtain discrete problem guaranteeing the necessary accuracy. The developed methodology is illustrated by an example concerning optimization of parameters for a satellite stabilization system.

  15. The Solubility Parameters of Ionic Liquids

    Science.gov (United States)

    Marciniak, Andrzej

    2010-01-01

    The Hildebrand’s solubility parameters have been calculated for 18 ionic liquids from the inverse gas chromatography measurements of the activity coefficients at infinite dilution. Retention data were used for the calculation. The solubility parameters are helpful for the prediction of the solubility in the binary solvent mixtures. From the solubility parameters, the standard enthalpies of vaporization of ionic liquids were estimated. PMID:20559495

  16. The Solubility Parameters of Ionic Liquids

    Directory of Open Access Journals (Sweden)

    Andrzej Marciniak

    2010-04-01

    Full Text Available The Hildebrand’s solubility parameters have been calculated for 18 ionic liquids from the inverse gas chromatography measurements of the activity coefficients at infinite dilution. Retention data were used for the calculation. The solubility parameters are helpful for the prediction of the solubility in the binary solvent mixtures. From the solubility parameters, the standard enthalpies of vaporization of ionic liquids were estimated.

  17. Quality assessment for radiological model parameters

    International Nuclear Information System (INIS)

    Funtowicz, S.O.

    1989-01-01

    A prototype framework for representing uncertainties in radiological model parameters is introduced. This follows earlier development in this journal of a corresponding framework for representing uncertainties in radiological data. Refinements and extensions to the earlier framework are needed in order to take account of the additional contextual factors consequent on using data entries to quantify model parameters. The parameter coding can in turn feed in to methods for evaluating uncertainties in calculated model outputs. (author)

  18. Study of electroweak parameters at LEP

    International Nuclear Information System (INIS)

    Blum, W.

    1991-10-01

    The measurement of the line shape and asymmetry parameters of the Z 0 in its leptonic and hadronic decays are reviewed. Progress is reported about a considerable increase in measurement accuracy. Several tests of the Standard Model confirm it to better than one per cent. New values for the effective mixing parameter are derived from the line shape parameters averaged over the four LEP experiments. The corresponding limits on the top mass are presented. (orig.)

  19. New fundamental parameters for attitude representation

    Science.gov (United States)

    Patera, Russell P.

    2017-08-01

    A new attitude parameter set is developed to clarify the geometry of combining finite rotations in a rotational sequence and in combining infinitesimal angular increments generated by angular rate. The resulting parameter set of six Pivot Parameters represents a rotation as a great circle arc on a unit sphere that can be located at any clocking location in the rotation plane. Two rotations are combined by linking their arcs at either of the two intersection points of the respective rotation planes. In a similar fashion, linking rotational increments produced by angular rate is used to derive the associated kinematical equations, which are linear and have no singularities. Included in this paper is the derivation of twelve Pivot Parameter elements that represent all twelve Euler Angle sequences, which enables efficient conversions between Pivot Parameters and any Euler Angle sequence. Applications of this new parameter set include the derivation of quaternions and the quaternion composition rule, as well as, the derivation of the analytical solution to time dependent coning motion. The relationships between Pivot Parameters and traditional parameter sets are included in this work. Pivot Parameters are well suited for a variety of aerospace applications due to their effective composition rule, singularity free kinematic equations, efficient conversion to and from Euler Angle sequences and clarity of their geometrical foundation.

  20. Parameter Estimation of Partial Differential Equation Models.

    Science.gov (United States)

    Xun, Xiaolei; Cao, Jiguo; Mallick, Bani; Carroll, Raymond J; Maity, Arnab

    2013-01-01

    Partial differential equation (PDE) models are commonly used to model complex dynamic systems in applied sciences such as biology and finance. The forms of these PDE models are usually proposed by experts based on their prior knowledge and understanding of the dynamic system. Parameters in PDE models often have interesting scientific interpretations, but their values are often unknown, and need to be estimated from the measurements of the dynamic system in the present of measurement errors. Most PDEs used in practice have no analytic solutions, and can only be solved with numerical methods. Currently, methods for estimating PDE parameters require repeatedly solving PDEs numerically under thousands of candidate parameter values, and thus the computational load is high. In this article, we propose two methods to estimate parameters in PDE models: a parameter cascading method and a Bayesian approach. In both methods, the underlying dynamic process modeled with the PDE model is represented via basis function expansion. For the parameter cascading method, we develop two nested levels of optimization to estimate the PDE parameters. For the Bayesian method, we develop a joint model for data and the PDE, and develop a novel hierarchical model allowing us to employ Markov chain Monte Carlo (MCMC) techniques to make posterior inference. Simulation studies show that the Bayesian method and parameter cascading method are comparable, and both outperform other available methods in terms of estimation accuracy. The two methods are demonstrated by estimating parameters in a PDE model from LIDAR data.