WorldWideScience

Sample records for valduriez relation emp

  1. 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...

  2. 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)

  3. 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.

  4. 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

  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. 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

  7. 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

  8. 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

  9. 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)

  10. 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

  11. 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.

  12. 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.

  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. 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

  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. 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.

  17. 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.

  18. 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.)

  19. 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

  20. 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.

  1. 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.

  2. 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

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  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. 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.

  9. 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...

  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. 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.

  12. 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.

  13. 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)

  14. 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

  15. 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

  16. 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.

  17. 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.

  18. 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)

  19. 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  

  20. 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.

  1. 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%.

  2. 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)

  3. 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

  4. 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.

  5. 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.

  6. 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

  7. 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.

  8. 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.

  9. 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

  10. 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.

  11. 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)

  12. 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...

  13. 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

  14. 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...

  15. 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.

  16. 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.

  17. 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

  18. 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

  19. 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.

  20. 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.

  1. 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.

  2. 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.

  3. 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

  4. 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...

  5. 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.

  6. 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

  7. 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

  8. 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...

  9. 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.

  10. 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

  11. 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.

  12. 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.

  13. 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.

  14. 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...

  15. EMP from a chemical explosion originating in a tunnel

    Energy Technology Data Exchange (ETDEWEB)

    Kelly, B. [Los Alamos National Lab., NM (United States)

    1994-12-31

    Electromagnetic pulses generated by a chemical explosion deep in a tunnel have been detected by sensors placed on both sides of the portal. These detectors consisted of antennas, current transformers, B-dots, and D-dots. The main objective was to collect data for non-proliferation studies complementary to and in cooperation with seismic methods. The electric field strength at the portal was computed from the data to be on the order of 50 millivolts per meter, with a Fourier transform indicating that most of the energy occurs below about 3 MHz. Several of the sensors displayed periodic sharp spikes probably not related to the device. Surface guided waves were detected along power and ground cables plus the railroad track. Time dependent surface current and charge were measured on the portal door, which serves as a secondary source for external radiation.

  16. Dynamic relations between stock markets index returns: Empirical evidence through multivariate approaches. Relações dinâmicas entre retornos de índices de mercados acionários: Evidências empíricas através de abordagens multivariadas.

    Directory of Open Access Journals (Sweden)

    Horst Dieter Moller

    2010-02-01

    Full Text Available The objective of this article was to identify both the structure and the standards of relations between stock markets returns. To accomplish this study, twelve indexes were investigated (Germany, Argentina, Australia, Brazil, United States of America, France, Hong Kong, India, Indonesia, England, Japan and Mexico. The data related to the time series of each stock returns investigated were from July, 27th of 2006 and March, 19th of 2007. To aim the objective proposed, three complementary multivariate methodological approaches were utilized: cluster analysis, the multidimensional scaling and the factor analysis. The procedures were carried out through the aid of the statistical application STATISTICA for Windows. The results showed some evidence that corroborate standards of relations based on geographic location of these markets investigated.O objetivo deste artigo foi identificar a estrutura e padrões de relações existentes entre os retornos dos índices de diversos mercados acionários. Para a realização do estudo, foram utilizados 12 índices, pertencentes a diversos mercados acionários (Alemanha, Argentina, Austrália, Brasil, Estados Unidos, França, Hong Kong, ͍ndia, Indonésia, Inglaterra, Japão e México. Os dados relativos às séries históricas das cotações dos índices de mercado inseridos nesta investigação são relativos aos valores registrados ao final do pregão do período entre 27 de julho de 2006 e 19 de Março de 2007. Para atingir o objetivo proposto, foram utilizadas três abordagens metodológicas multivariadas complementares: a análise de agrupamentos, o escalonamento multidimensional e a análise fatorial. Os resultados obtidos revelam evidências que corroboram padrões de relacionamento baseados na localização geográfica dos mercados acionários investigados.

  17. 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.

  18. 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

  19. La spirale dell’azzardo: una subcultura del gioco che “evapora” le relazioni / La spirale du jeu de hasard : une sous-culture qui empêche toute relation / The gambling: a subculture of game that “burns” the relationships

    Directory of Open Access Journals (Sweden)

    Molin Valentina

    2011-07-01

    Full Text Available In this paper I have analysed the characteristics of what I define the “gambling subculture”, which is detectable in certain gaming environments and in subgroups of particularly “rabid” players. Within these subcultures there have been identified rules and sanctions, values, consolidate behaviours, characterization of relationships and interactions, and the conclusion is that what is built within the gambling environment is a separate universe, an “outer reality”, in which the values of the world “outside” change. It was also possible to conclude that, to join the gambling world for a gambler – learning its rules, sharing its values, developing relations inside it – represents a stimulus for gambling habits, as it allows to consider as “normal” their behaviour thanks to positive feedback from their groups of fellow players, and to the neutralization of possible negative feedback from “non-players”.Nel presente contributo vengono analizzate le caratteristiche di quella che ho definito “subcultura dell'azzardo”, rilevabile in determinati ambienti ludici e in sotto-gruppi di giocatori particolarmente “accaniti”. Di queste forme di subcultura sono state individuate norme e sanzioni, valori, comportamenti consolidati, caratterizzazione delle relazioni e delle interazioni, giungendo alla conclusione che quello che viene costruito negli spazi di gioco rappresenta un universo separato, un “extraluogo”, nel quale vengono scritte nuove regole e nel quale cambiano i valori rispetto al mondo “esterno”. È stato possibile inoltre concludere che l'adesione all'“universo gioco” – l'interiorizzazione delle sue norme, la condivisione dei suoi valori, lo sviluppo di relazioni al suo interno – rappresenta un fattore di mantenimento della condotta ludica, poiché permette di considerare “normale” il proprio comportamento grazie ai rinforzi positivi che giungono dal gruppo dei compagni-giocatori e alla

  20. 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.

  1. 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....

  2. 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.

  3. 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.

  4. 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

  5. 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.

  6. 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

  7. 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.

  8. 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.

  9. 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...

  10. 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

  11. 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.

  12. 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

  13. 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.

  14. 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.

  15. 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)

  16. 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

  17. 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

  18. 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

  19. 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.

  20. 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.

  1. 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.

  2. 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...

  3. 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)

  4. 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....

  5. 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.

  6. 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.

  7. 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...

  8. 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...

  9. 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...

  10. 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.

  11. 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...

  12. 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

  13. 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...

  14. 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...

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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

  20. 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

  1. 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

  2. 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...

  3. 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.

  4. 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...

  5. 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...

  6. 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...

  7. 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...

  8. 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...

  9. 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...

  10. 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 ...

  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

    Directory of Open Access Journals (Sweden)

    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. 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

  11. Relativity

    CERN Document Server

    Einstein, Albert

    2013-01-01

    Time magazine's ""Man of the Century"", Albert Einstein is the founder of modern physics and his theory of relativity is the most important scientific idea of the modern era. In this short book, Einstein explains, using the minimum of mathematical terms, the basic ideas and principles of the theory that has shaped the world we live in today. Unsurpassed by any subsequent books on relativity, this remains the most popular and useful exposition of Einstein's immense contribution to human knowledge.With a new foreword by Derek Raine.

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

  15. 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

  16. 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.

  17. 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.

  18. 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

  19. 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.

  20. 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.

  1. 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....

  2. 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 ...

  3. 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...

  4. 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.

  5. 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.

  6. 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.

  7. 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...

  8. 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....

  9. 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

  10. 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...

  11. 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...

  12. 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

  13. 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.

  14. 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

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  1. Modelación empírica de flotación en columna a escala piloto

    Directory of Open Access Journals (Sweden)

    Simpson, J.

    2010-04-01

    úrgicos (ley de concentrado, ley de relaves, razón de enriquecimiento y recuperación en función de las variables operacionales que sean manipulables busca entregarle mayor libertad al operador y al ingeniero de procesos para lograr la sintonización operacional de la columna. El método empleado para el desarrollo de los modelos fue Stepwise Regression (Regresión por Pasos considerando relaciones empíricas entre variables operacionales y los resultados experimentales. Todos los modelos presentaron sobre un 90 % de exactitud, salvo uno de ellos que fue sobre 70 %.

  2. 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 ...

  3. 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 ...

  4. 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

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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

  10. 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.

  11. 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.

  12. 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.

  13. 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

  14. 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

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

    Directory of Open Access Journals (Sweden)

    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.

  16. 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

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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,...

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  1. 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

  2. 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.

  3. Pobreza e indigência no Brasil: algumas evidências empíricas com base na PNAD 2004

    Directory of Open Access Journals (Sweden)

    Sonia Rocha

    2006-08-01

    Full Text Available This article presents income-based indicators using the data from the 2004 Brazilian National Household Survey regarding poverty and indigence in 2004. It refers to spatial characteristics of poverty, as well as its relation with the functioning of the labor market and the way family income is formed. The relatively sharp reduction in poverty and indigence from 2003 to 2004, the best result obtained since the Real Plan was implemented, constitutes the background for the analysis, although the impact of this reduction is spatially differentiated, more favorable in rural areas and less so in the São Paulo metropolitan area. The increase in family income is mainly due to the vigorous expansion of occupation, as the average labor income remained unchanged. Nevertheless, poor individuals benefited from the reduction in the returns to schooling, from the real increase in the minimum wage and from the wider scope of the social security net, which resulted in a more vigorous income increase at the base of distribution, thus leading to a reduction in inequality.

  4. ¿Cómo Innovan las Empresas Españolas? Una Evidencia Empírica

    Directory of Open Access Journals (Sweden)

    Jaider Manuel Vega Jurado

    2008-10-01

    Full Text Available This paper investigates the determinants of firms’ innovative performance, by exploring the effects of different innovation strategies related to generation and acquisition of technological knowledge. The analysis is based on a sample of 1329 Spanish manufacturing firms. The results suggest that R&D contracting has not significant effect on firms’ innovative performance and that cooperation with external agents has a limited effect. In contrast, the development of in-house R&D activities seems to be the most important strategy to introduce new products onto the market. These results warns against the risk of overrating external knowledge sourcing, and highlight the need for policy makers to establish innovation policies mainly focus on strengthening the technological capabilities of firms.

  5. Petrographic and EMP study of metamorphic rocks from the Variscan basement of Dinarides (Vranica Mountains, Bosnia and Herzegovina)

    Energy Technology Data Exchange (ETDEWEB)

    Hrvanovic, S [Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, 84215 Bratislava (Slovakia)

    2012-04-25

    The Vranica Mountains are located in the middle part of Bosnia and Herzegovina or in the southeastern part of the Mid - Bosnian schist Mountains (MBSM). The Mid - Bosnian schist Mountains represent one of the largest allochtonous Paleozoic terranes in the Dinarides. This region is characterized by a multistage geodynamic evolution. The presented results concern Variscan metamorphism of the Silur-Devonian protolith formations that occurred mainly during the Early Carboniferous in LT/MP greenschist facies. Petrographical description of metamorphic rocks is completed by EMPA of muscovite, chlorite and chloritoid. The Early Alpine metamorphic overprint is related to the closure of a Tethyan Basin and Early Cretaceous collision of the Adria microplate with the Tissia-Moesia continental Blocks. The Neo-Alpine metamorphic overprint occurred due to the collision of the African and Euroasian Plates. (authors)

  6. Pobreza e indigência no Brasil: algumas evidências empíricas com base na PNAD 2004

    Directory of Open Access Journals (Sweden)

    Sonia Rocha

    2009-06-01

    Full Text Available This article presents income-based indicators using the data from the 2004 Brazilian National Household Survey regarding poverty  and indigence in 2004. It refers to spatial characteristics of poverty, as well as its relation with the functioning of the labor market and the  way family income is formed. The relativelysharp reduction in poverty and indigence from 2003 to 2004, the best result obtained since the Real Plan was implemented, constitutes the background for the analysis, although the impact of this reduction is spatially differentiated, more favorable in rural areas and less so in the São Paulo metropolitan area. The increase in family income is mainly due to the vigorous expansion of  occupation, as the average labor income remained unchanged. Nevertheless, poor  individuals benefited from the reduction in the returns to schooling, from the realincrease in the minimum wage and from the wider scope of the social security net, which resulted in a more vigorous income increase at the base of distribution, thus leading to a reduction in inequality.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.  

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. Determinantes do "milagre" econômico brasileiro (1968-1973: uma análise empírica

    Directory of Open Access Journals (Sweden)

    Fernando A. Veloso

    2008-06-01

    Full Text Available O objetivo deste estudo é quantificar, através de uma metodologia de regressão de crescimento com dados de painel, a importância de possíveis determinantes do "milagre" econômico brasileiro de 1968-1973. Em particular, verificamos em que medida o "milagre" decorreu da situação externa favorável, do desempenho de variáveis de política econômica no período 1968-1973 e das reformas institucionais do Programa de Ação Econômica do Governo (PAEG do Governo Castello Branco (1964-1967. Os resultados mostram que tanto o ambiente externo como as variáveis de política econômica explicam uma parcela relativamente pequena da aceleração do crescimento observada entre 1962-1967 e 1968-1973. Isso decorre do fato de que o modelo de crescimento estimado com base em painéis de seis anos superestima fortemente o crescimento econômico brasileiro no período anterior ao "milagre" e subestima o crescimento no período do "milagre". Os resultados mostram, no entanto, que o modelo estimado para painéis de dez anos prevê para o período 1964-1973 uma taxa de crescimento bastante próxima da taxa de crescimento efetivamente verificada. Em conjunto, nossos resultados indicam que o episódio de aceleração do crescimento associado ao "milagre" decorreu em grande medida do efeito defasado das reformas associadas ao PAEG.The goal of this paper is to quantify, using a growth regression methodology with panel data, the importance of possible determinants of the Brazilian economic "miracle" of1968-1973. In particular, we verify to what extent the "miracle" was due to the favourable external environment, to the economic policy variables in the period 1968-1973 and to the institutional reforms associated with the Programa de Ação Econômica do Governo (PAEG implemented during the Castello Branco presidential term (1964-1967. The results show that both the external environment and the economic policy variables explain a relatively small fraction of the

  20. 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.

  1. 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.

  2. 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...

  3. 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...

  4. 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.

  5. 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

  6. 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.

  7. 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

  8. 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

  9. 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

  10. 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...

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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

  16. Condicionantes en la utilización de los servicios de atención primaria: Evidencias empíricas e inconsistencias metodológicas Factors conditioning primary care services utilization: Empirical evidence and methodological inconsistencies

    Directory of Open Access Journals (Sweden)

    M. Sáez

    2003-10-01

    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

  17. Evaluation of empirical methods to estimate reference evapotranspiration in Uberaba, State of Minas Gerais, Brazil Avaliação de métodos empíricos na estimativa devapotranspiração de referência para Uberaba - MG

    Directory of Open Access Journals (Sweden)

    Giovani L. de Melo

    2012-10-01

    Full Text Available Evapotranspiration is the process of water loss of vegetated soil due to evaporation and transpiration, and it may be estimated by various empirical methods. This study had the objective to carry out the evaluation of the performance of the following methods: Blaney-Criddle, Jensen-Haise, Linacre, Solar Radiation, Hargreaves-Samani, Makkink, Thornthwaite, Camargo, Priestley-Taylor and Original Penman in the estimation of the potential evapotranspiration when compared to the Penman-Monteith standard method (FAO56 to the climatic conditions of Uberaba, state of Minas Gerais, Brazil. A set of 21 years monthly data (1990 to 2010 was used, working with the climatic elements: temperature, relative humidity, wind speed and insolation. The empirical methods to estimate reference evapotranspiration were compared with the standard method using linear regression, simple statistical analysis, Willmott agreement index (d and performance index (c. The methods Makkink and Camargo showed the best performance, with "c" values ​​of 0.75 and 0.66, respectively. The Hargreaves-Samani method presented a better linear relation with the standard method, with a correlation coefficient (r of 0.88.A evapotranspiração é o processo de perda de água do solo vegetado devido à evaporação e à transpiração, podendo ser estimada por vários métodos empíricos. Objetivou-se, com o presente trabalho, realizar a avaliação do desempenho dos métodos de Blaney-Criddle, Jensen-Haise, Linacre, Radiação Solar, Hargreaves-Samani, Makkink, Thornthwaite, Camargo, Priestley-Taylor e Penman Original na estimativa da evapotranspiração potencial em comparação com o método-padrão Penman-Monteith (FAO56, para as condições climáticas do município de Uberaba-MG. Utilizou-se um conjunto de dados mensais de 21 anos (1990 a 2010, trabalhando-se com os elementos climáticos temperatura, umidade relativa, velocidade do vento e insolação. Os métodos empíricos para a

  18. 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

  19. Efecto de un curso de relación de ayuda sobre la elección de respuesta espontánea e identificación de respuesta empática en alumnos de enfermería Effect of a counseling course on the choice of spontaneous response and empathetic response identification by nursury students

    Directory of Open Access Journals (Sweden)

    José Carlos Bermejo Higuera

    2012-03-01

    Full Text Available Objetivos: determinar la tendencia de respuesta espontánea de alumnos de Enfermería ante situaciones simuladas de conflicto emocional antes y después de cursar una asignatura de relación de ayuda. Método: estudio cuasiexperimental pretest-postest en un grupo de 78 estudiantes de enfermería. Se aplicó un ejercicio de elección de respuesta espontánea antes y después de cursar una asignatura de relación de ayuda. Cincuenta estudiantes participaron en el pretest y 75 en el postest. Se evaluó la elección de respuesta entre seis tipos a elegir. Como contraste de medias prueba T para muestras relacionadas e independientes. Chi cuadrado para observar las distribuciones de elección de respuesta; intervalo de confianza 95%. Resultados: antes del curso eligieron espontáneamente la respuesta empática en el 9% de las ocasiones, mientras que al acabar el curso lo hicieron en el 43% de las ocasiones. El 33% de respuesta de apoyo-consuelo inicial disminuyó a 10%; el 30% de respuestas de solución de problema inicial disminuyó a 19%; el 18% de respuestas de valoración o juicio moral inicial disminuyó a 11%; el 8% de respuestas de investigación aumentó a 12%; medias estadísticamente significativas entre sus diferencias pre y postest. Se observaron pequeñas diferencias de género. Conclusiones: Los resultados apuntan a la validez de la formación en relación de ayuda para el aprendizaje de la respuesta empática.Objective: to determine spontaneous response tendency in emotionally conflictive simulated situations by nursery students before and after attending a counseling subject. Method: pretest-posttest cuasiexperimental study with a group of 78 nursing students. They were applied a spontaneous response choice test before and after studying a subject on counseling. There were 50 participants that answered the pre-test and 75 the post-test. The answer choice out of 6 posibilities was evaluated. T test was performed for related samples and

  20. Aprendizagem Tecnológica e Inovação Industrial em Economias Emergentes: uma Breve Contribuição para o Desenho e Implementação de Estudos Empíricos e Estratégias no Brasil

    Directory of Open Access Journals (Sweden)

    Paulo N. Figueiredo

    2004-01-01

    Full Text Available The theme of industrial innovation strategies was formally brought into the government agenda in Brazil during the late-1960s. Since then, there has been a profusion of studies based on descriptions and analysis relative to the design and implementation of industrial innovation strategies. Despite the merit of the existing works in this field in Brazil, there still is a scarcity of both conceptual and, in particular, management approaches to contribute to improving innovation strategies in Brazil. Thus, the focus of this article is centred on two tasks. The first is to clarify some definitions underlying the design and implementation of empirical studies and industrial innovation strategies from the perspective on technological learning in emerging economies. The second is to present some metrics associated with the design and implementation of such strategies and empirical studies, particularly in Brazil. The article seeks to clarify and enlarge the understanding of the intricate process of technological development in the context of emerging economies and, thus, assist researchers and managers involved with industrial innovation management in Brazil.O tema estratégia de inovação industrial entrou formalmente na agenda de discussão e ação governamental no Brasil no final dos anos 1960. Desde então, tem havido uma profusão de estudos baseados em descrições, análises e propostas relativas a estratégias de inovação industrial no País. A despeito do grande mérito dos vários trabalhos neste campo no Brasil, ainda há uma escassez de contribuições conceituais e, principalmente, gerenciais voltadas para o aprimoramento do desenho e da implementação de estudos empíricos e de tais estratégias. Por isso, este artigo tem seu foco em duas tarefas: a primeira é clarificar certas definições relativas ao desenho e implementação de estudos empíricos e de estratégias de inovação industrial a partir da perspectiva de aprendizagem

  1. 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

  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. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. Les peintres d’Empédocle (DK 31 B23) : enjeux et portée d’une analogie préplatonicienne

    NARCIS (Netherlands)

    Iribarren, Baralt L.

    2015-01-01

    This paper focuses on Empedocles’ fragment B23, in which the author analogically relates the generation of living species from four elements to the art of painting, whose productions result from the mixing of a limited number of pigments. The first part of the article deals with the heuristic

  15. Social classes in La Plataïs horticulture: Exercise of theorizing, historicizing and empirical analysis Las clases sociales en la horticultura platense: Ejercicio de teorización, historización y análisis empírico

    Directory of Open Access Journals (Sweden)

    Soledad Lemmi

    2011-01-01

    Full Text Available This article provides a characterization of the social relations that prevail in vegetable production in La Plata. The work is based on the tenets of Marxism, which are used for understanding and description of the society. In the first section, a brief theoretical description of the capitalist logic of production is made following the historical materialism methodology, and proposed a designation of the subject of horticulture in the classic formulation of Marxism to capitalist social relations: landowners, bourgeois and salaried. Then empirical data is displayed on the sector that accounts of the historical formation of social classes in it. This information emerges from the analysis and study of the historical shape of La Plata horticultural land, the 1998 and 2005 horticultural census results, the confrontation and conflict register brought on by the different subjects of production over the last 50 years and ends with several contributions arising from oral histories taken from interviews. Finally, some conclusions are systematized.En este artículo se realiza una caracterización de las relaciones sociales que priman en la producción de hortalizas en La Plata. El trabajo parte de los postulados del marxismo para el entendimiento y descripción de la sociedad. En el primer apartado se realiza una breve descripción teórica de la lógica capitalista de producción siguiendo la metodología del materialismo histórico y se propone una denominación de los sujetos de la horticultura bajo la formulación clásica del marxismo para las relaciones sociales capitalistas: terratenientes, burguesía y asalariados. Luego se despliega información empírica sobre el sector que da cuenta de la conformación histórica de las clases sociales en el mismo. Esta información surge del análisis y estudio de la conformación histórica del territorio hortícola platense, los resultados de los censos hortícolas de 1998 y 2005, del registro de los

  16. Comprovação empírica de uma medida relacionada ao excessivo consumo de álcool em brasileiros / Empirical Verification of a Measurement Related to the Excessive Alcohol Consumption in Brazilians

    Directory of Open Access Journals (Sweden)

    Nilton S. Formiga

    2015-06-01

    Full Text Available RESUMO: O consumo de álcool entre universitários tem sido um problema determinante para as relações interpessoais e desenvolvimento acadêmico, mas também um problema que traz um prejuízo social, econômico e de saúde. Medidas tem surgido e sugerida a reavaliação de outras para identificar o fenômeno do consumo de álcool. Porém, o Alcohol Use Disorders Identification Test (AUDIT ainda tem sido o instrumento mais utilizado em estudos no mundo, o qual tem se revelado consistente. O presente estudo tem como objetivo avaliar a consistência interna e fatorial do AUDIT em universitários em diferentes estados brasileiros. O AUDIT e dados sociodemográficos foram respondidos por 639 universitários dos dois sexos, acima de 18 anos, distribuídos em diferentes cursos superiores de instituições particulares e públicas em quatro estados no Brasil. Realizando distintos cálculos estatísticos, observaram-se indicadores psicométricos que revelaram confiabilidade na medida do AUDIT na amostra pesquisada. Este procedimento tanto garantiu a medida sobre a identificação do problema do consumo de álcool quanto observou-se que, independente do contexto educacional dos universitários, nos referidos estados brasileiros, todos os respondentes revelaram problemas com o consumo alcoólico. ABSTRACT: The consumption of alcohol in college students has been a crucial problem for interpersonal relationships and academic development; but it is also a problem that means a social, economic and health damage. It has been emerged and suggested measures to be ratified to identify the phenomenon of alcohol consumption. However, the Alcohol Use Disorders Identification Test (AUDIT is still the most used instrument in world studies, the same one that has remained constant. The present research aims to assess the internal and factorial consistency of the AUDIT in college students from different Brazilian States. A total of 639 college students of both sexes over 18 years old, distributed in different advanced courses of public and private institutions in four Brazilian States, responded the AUDIT and socio-demographic data. Performing different statistical calculations, psychometric indicators were observed which gave confidence to the AUDIT measurement in the investigated sample. This procedure guaranteed the measure regarding the identification of the alcohol consumption problem, as it also observed that independent of the educational context of college students in the concerned Brazilian States, all respondents revealed problems with alcohol consumption.

  17. La simulación empresarial como experiencia relacionada con el Marketing. Una propuesta empírica / Business simulation as an experience related to marketing. An empirical proposal

    Directory of Open Access Journals (Sweden)

    Francisco J. Liébana-Cabanillas

    2013-05-01

    Full Text Available El trabajo analiza la influencia del uso de las TIC y la importancia del trabajo en equipo en las asignaturas de marketing de titulaciones de empresariales. El eje principal de este trabajo se basa en identificar si la utilización de las TIC en grupo favorece el aprendizaje de la disciplina del marketing, así como las habilidades sociales del alumno. Con el objetivo de evaluar la influencia de la utilización del simulador Markops Online en el aprendizaje del alumno, fue aplicado un cuestionario a 784 alumnos de la Universidad de Granada.Los resultados muestran como los alumnos perciben que el uso de dichas herramientas, a pesar de requerir un mayor esfuerzo que las tradicionales prácticas de casos, les genera mayor satisfacción, incrementa su aprendizaje de manera más atractiva y fomenta el desarrollo de sus habilidades sociales.This paper analyzes the influence of the use of ICT and the importance of teamwork for marketing subjects in business studies. The central theme of this paper is to identify whether the use of ICT in groups enhances the learning of the marketing discipline, as well as students’ social skills. At the University of Granada, we conducted a questionnaire to 784 students over three academic years (2006-2009 with the aim of evaluating the influence of using the Markops Online simulator on the student’s learning process. The results show how students perceive that the use of these tools, although requiring greater effort than conventional case studies, provides them greater satisfaction, increases their interest in the learning process and helps developing social skills.

  18. Cellular responses to Plasmodium falciparum erythrocyte membrane protein-1: use of relatively conserved synthetic peptide pools to determine CD4 T cell responses in malaria-exposed individuals in Benin, West Africa

    Directory of Open Access Journals (Sweden)

    Sanni Ambaliou

    2002-04-01

    Full Text Available Abstract Background Plasmodium falciparum erythrocyte membrane protein-1, a variant antigen of the malaria parasite, is potentially a target for the immune response. It would be important to determine whether there are CD4 T cells that recognise conserved regions. However, within the relatively conserved region, there is variation. It is not possible to test T cell responses from small field samples with all possible peptides. Methods We have aligned sequences that are relatively conserved between several PfEMP1 molecules, and chosen a representative sequence similar to most of the PfEMP1 variants. Using these peptides as pools representing CIDRα, CIDRβ and DBLβ-δ domains, DBLα domain, and EXON 2 domain of PfEMP1, we measured the CD4 T cell responses of malaria-exposed donors from Benin, West Africa by a FACS based assay. Results All the three peptide pools elicited a CD4 T cell response in a proportion of malaria-exposed and non-exposed donors. CD4 T cell proliferation occurs at a relatively higher magnitude to peptide pools from the DBLα and EXON 2 in the malaria-exposed donors living in Benin than in the UK malaria-unexposed donors. Conclusions These findings suggest that an immunological recall response to conserved peptides of a variant antigen can be measured. Further testing of individual peptides in a positive pool will allow us to determine those conserved sequences recognised by many individuals. These types of assays may provide information on conserved peptides of PfEMP1 which could be useful for stimulating T cells to provide help to P. falciparum specific B cells.

  19. Optimization of Extended Relational Database Systems

    Science.gov (United States)

    1986-07-23

    control functions are integrated into a single system in a homogeneoua way. As a first exam - ple, consider previous work in supporting various semantic...sizes are reduced and, wnk? quently, the number of materializations that will be needed is aba lower. For exam - pie, in the above query tuple...retrieve (EMP.name) where EMP hobbies instrument = ’ violin ’ When the various entries in the hobbies field are materialized, only those queries that

  20. AIDS e pauperização: principais conceitos e evidências empíricas AIDS and pauperization: principal concepts and empirical evidence

    Directory of Open Access Journals (Sweden)

    Francisco Inácio Bastos

    2000-01-01

    Full Text Available O artigo discute as estratégias metodológicas que vêm sendo usadas na análise das inter-relações entre a vulnerabilidade ao HIV/AIDS e as desigualdades sociais, o preconceito e a marginalização, ressaltando-se as dificuldades metodológicas e as estratégias alternativas de investigação encontradas. Os principais achados da literatura internacional e brasileira foram revistos, enfatizando-se os temas: dimensões econômicas e macropolíticas da difusão do HIV/ AIDS; papel do consumo e da política de drogas; desigualdade e preconceito de gênero; desigualdade e preconceito racial/origem étnica; interação com as demais infecções sexualmente transmissíveis e sua relação com a pobreza; padrões de assistência à saúde e HIV/AIDS, em especial, acesso a anti-retrovirais; e violação dos direitos humanos. Apesar da restrita produção acadêmica brasileira e dos dilemas metodológicos envolvidos no exame das inter-relações entre variáveis psicossociais, culturais, sócio-políticas e vulnerabilidade ao HIV/AIDS, tais temas devem ser investigados em detalhe - considerando especificidades sociais e culturais do Brasil - e beneficiados pelas novas estratégias de pesquisa.This paper discusses methodologies for analyzing relations between social inequalities, marginalization, prejudice, and vulnerability to HIV/AIDS, highlighting current difficulties and alternative research strategies. It also reviews the international and Brazilian literature, emphasizing: economic and macropolitical dimensions in the spread of HIV/AIDS; the role of drug policies and consumption; gender inequalities and prejudice; racial/ethnic inequalities and prejudice; and interaction with other STIs and their relationship to poverty; HIV/AIDS and health care standards, especially access to antiretroviral therapy; and human rights violations. Despite current methodological dilemmas in analyzing relations between psychosocial, cultural, and sociopolitical

  1. 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

  2. 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

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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

  9. 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.

  10. 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.

  11. Impacto de la aplicación del fair value en la volatilidad de la banca Brasileña: un estudio empírico

    Directory of Open Access Journals (Sweden)

    José Carlos Peréa Monteiro

    2006-04-01

    Full Text Available En este paper es analizado el impacto que ha tenido la adopción del valor razonable sobre la volatilidad de los resultados y fondos propios en los bancos de Brasil. La muestra estuvo constituida por 73 bancos que representaban, a Junio del 2002, el 95,93% del total de activos del sistema nacional. Se realizo un análisis comparativo entre las volatilidades, con y sin los efectos de la nueva regulación, e se indago para conocer si existe algún síntoma de utilización de prácticas para el alisamiento de los beneficios, relacionadas con las partidas de ajustes a valor razonable. Los resultados de esta investigación revelan que, al contrario de lo que se espera, el nuevo criterio en cuestión no ha incrementado las volatilidades y, por otro lado, han puesto en manifiesto síntomas de alisamiento de beneficios.In this paper, we analyze the impact of the adoption of fair value on the volatility of the results and reserves of Brazilian banks. The sample consisted of 73 banks, which represented, in June 2002, 95.93% of total assets in the national system. We conducted a comparative analysis between the volatilities, with and without the effects of the new regulation, and investigated if there is some symptom of utilization of practices for smoothing the benefits, related to the items of adjustments to fair value. The results of our research revealed that, as opposed to expectations, the new criterion in question has not increased volatility but, on the opposite, has exhibited symptoms of smoothing of benefits.

  12. Gestão de recursos humanos e desempenho operacional: evidências empíricas Human resource management and operational performance: empirical evidence

    Directory of Open Access Journals (Sweden)

    Charbel José Chiappetta Jabbour

    2012-01-01

    Full Text Available A gestão de recursos humanos é frequentemente apontada como uma variável que influencia positivamente no desempenho das organizações. Enquanto argumentos e proposições teóricas de teor similar se multiplicam na literatura especializada, ainda são raras as pesquisas que lançam luzes sobre essa relação para empresas brasileiras. Nesse sentido, foi realizada uma pesquisa com o objetivo de verificar, empiricamente, se a gestão de recursos humanos influencia de maneira positiva o desempenho de empresas do segmento de autopeças e componentes automotivos em suas operações. Metodologicamente, realizou-se um survey com 75 empresas do setor mencionado, cujos dados foram analisados por meio de modelagem de equações estruturais, uma análise multivariada de segunda geração. A principal hipótese da pesquisa foi confirmada, revelando que, de fato, a gestão de recursos humanos está positivamente relacionada com o desempenho operacional das empresas analisadas.Human resource management is often cited as a variable that positively influences the performance of organizations. Arguments and theoretical proposals of similar content have increased in the literature, yet there is very little research that sheds light on this relationship in Brazilian companies. Accordingly, a survey was conducted in order to check empirically whether the human resource management positively influences the operational performance of companies in the Brazilian automotive industry focusing on the segment of automotive parts and components. Methodologically, a survey of 75 companies in the sector aforementioned was carried out; the data were analyzed using Structural Equation Modeling, a second-generation multivariate analysis. The main hypothesis was confirmed indicating that human resource management is indeed positively related to the operational performance of the companies studied.

  13. Relativity made relatively easy

    CERN Document Server

    Steane, Andrew M

    2012-01-01

    Relativity Made Relatively Easy presents an extensive study of Special Relativity and a gentle (but exact) introduction to General Relativity for undergraduate students of physics. Assuming almost no prior knowledge, it allows the student to handle all the Relativity needed for a university course, with explanations as simple, thorough, and engaging as possible.The aim is to make manageable what would otherwise be regarded as hard; to make derivations as simple as possible and physical ideas as transparent as possible. Lorentz invariants and four-vectors are introduced early on, but tensor not

  14. La divulgación de información sobre responsabilidad corporativa en administraciones públicas: un estudio empírico en gobiernos locales

    Directory of Open Access Journals (Sweden)

    Andrés Navarro

    2010-12-01

    strengths and weaknesses about CSR of information systems of these entities, identifying opportunities for improvement to guide future research. To do this, we analyzed the websites of 55 large local governments, drawing conclusions about the disclosure of CSR general information and about the publication of on economic, social and environmental information. The results reveal that the major shortcomings in CSR disclosure are related to environmental information, while social information is the most published. Also, the size of the entity, political competition and the political sign of the government, do not explain the development of disclosure of RSC information.

  15. Experimental Alcohol-Related Peripheral Neuropathy: Role of Insulin/IGF Resistance

    Directory of Open Access Journals (Sweden)

    James Gilchrist

    2012-08-01

    Full Text Available The mechanisms of alcohol-related peripheral neuropathy (ALPN are poorly understood. We hypothesize that, like alcohol-related liver and brain degeneration, ALPN may be mediated by combined effects of insulin/IGF resistance and oxidative stress. Adult male Long Evans rats were chronically pair-fed with diets containing 0% or 37% ethanol (caloric, and subjected to nerve conduction studies. Chronic ethanol feeding slowed nerve conduction in the tibial (<em>p = 0.0021 motor nerve, and not plantar sensory nerve, but it did not affect amplitude. Histological studies of the sciatic nerve revealed reduced nerve fiber diameters with increased regenerative sprouts, and denervation myopathy in ethanol-fed rats. qRT-PCR analysis demonstrated reduced mRNA levels of insulin, IGF-1, and IGF-2 polypeptides, IGF-1 receptor, and IRS2, and ELISAs revealed reduced immunoreactivity for insulin and IGF-1 receptors, IRS-1, IRS-4, myelin-associated glycoprotein, and tau in sciatic nerves of ethanol-fed rats (all <em>p < 0.05 or better. The findings suggest that ALPN is characterized by (1 slowed conduction velocity with demyelination, and a small component of axonal degeneration; (2 impaired trophic factor signaling due to insulin and IGF resistance; and (3 degeneration of myelin and axonal cytoskeletal proteins. Therefore, ALPN is likely mediated by molecular and signal transduction abnormalities similar to those identified in alcoholic liver and brain degeneration.

  16. Les transformations des relations euro-méditerranéennes après le cinquième élargissement de l’UE : Portée et limites des cadres de voisinage euro-méditerranéens

    OpenAIRE

    Mourad , Ali

    2014-01-01

    With the launch of the Euro-Mediterranean Partnership (EMP) in 1995, the relation between the relationship between the EU and Mediterranean countries witnessed a significant evolution. With the establishment of a multilateral framework supplemented by the conclusion of association agreements, this Partnership represents a break with past Mediterranean policies. In the context of the fifth enlargement of the European Union on May 1st, 2004, the European Neighbourhood Policy (ENP) transforms th...

  17. Pathway-based analysis of a melanoma genome-wide association study: analysis of genes related to tumour-immunosuppression.

    Directory of Open Access Journals (Sweden)

    Nils Schoof

    Full Text Available Systemic immunosuppression is a risk factor for melanoma, and sunburn-induced immunosuppression is thought to be causal. Genes in immunosuppression pathways are therefore candidate melanoma-susceptibility genes. If variants within these genes individually have a small effect on disease risk, the association may be undetected in genome-wide association (GWA studies due to low power to reach a high significance level. Pathway-based approaches have been suggested as a method of incorporating a priori knowledge into the analysis of GWA studies. In this study, the association of 1113 single nucleotide polymorphisms (SNPs in 43 genes (39 genomic regions related to immunosuppression have been analysed using a gene-set approach in 1539 melanoma cases and 3917 controls from the GenoMEL consortium GWA study. The association between melanoma susceptibility and the whole set of tumour-immunosuppression genes, and also predefined functional subgroups of genes, was considered. The analysis was based on a measure formed by summing the evidence from the most significant SNP in each gene, and significance was evaluated empirically by case-control label permutation. An association was found between melanoma and the complete set of genes (p(emp=0.002, as well as the subgroups related to the generation of tolerogenic dendritic cells (p(emp=0.006 and secretion of suppressive factors (p(emp=0.0004, thus providing preliminary evidence of involvement of tumour-immunosuppression gene polymorphisms in melanoma susceptibility. The analysis was repeated on a second phase of the GenoMEL study, which showed no evidence of an association. As one of the first attempts to replicate a pathway-level association, our results suggest that low power and heterogeneity may present challenges.

  18. 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

  19. 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

  20. 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

  1. Infección urinaria adquirida en la comunidad en pacientes pediátricos: clínica, factores de riesgo, etiología, resistencia a los antibióticos y respuesta a la terapia empírica Urinary tract infection acquired in the community in pediatric patients: Clinical picture, risk factors, etiology, antibiotic resistance, and response to empirical therapy

    Directory of Open Access Journals (Sweden)

    Álvaro Hoyos

    2012-06-01

    Full Text Available Objetivos. Describir la presentación clínica, factores de riesgo (FR, etiología y patrones de resistencia bacterianos en pacientes pediátricos hospitalizados con infección del tracto urinario (ITU de la comunidad. Explorar factores de riesgo en ITU por bacterias resistentes. Evaluar respuesta clínica a la terapia empírica con aminoglucósidos y el protocolo institucional de antibióticos en ITU frente al perfil de sensibilidad de los aislamientos. Métodos. Estudio de corte trasversal entre febrero 2009-febrero 2011. Resultados: ingresaron 106 pacientes, 47 hombres (44,3% vs. 59 mujeres (55,6%. El rango de edad más frecuente en ambos sexos fue 1-12 meses (63.2%. La ITU febril se presentó en el 78,7% de los hombres y en el 83,0% de las mujeres. Se encontraron FR en 59,4% de los pacientes y en el 27,3% se presentaron dos o más. Los principales agentes etiológicos fueron: Escherichia coli, Proteus mirabilis y Klebsiella pneumoniae; dos y 12 aislamientos (13.1% expresaron β-lactamasas de espectro extendido (βLEE o de tipo AmpC (presuntivo, respectivamente. En el análisis exploratorio, se observó una frecuencia significativamente superior del antecedente de malformación renal o de la vía urinaria en el grupo de pacientes con ITU causada por bacterias βLEE o AmpC (p=0,0095. La defervescencia como respuesta a la terapia empírica inicial con aminoglucósidos ocurrió en las primeras 36 horas en el 87,4% de los pacientes con ITU febril, independientemente del perfil de resistencia. Conclusiones. La ITU febril fue la principal presentación clínica. Se aislaron bacterias de la comunidad que expresaron βLEE+ o AmpC+. A nivel institucional el uso de aminoglucósidos son una buena alternativa para el tratamiento inicial debido a su alta efectividad clínica y bajo perfil de resistencia.Objectives: to describe the clinical presentation, risk factors (RF, etiology and bacterial resistance patterns in pediatric patients hospitalized with

  2. 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

  3. 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.

  4. 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

  5. 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.

  6. 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

  7. 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

  8. 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

  9. Preços de commodities e nível de atividade em uma pequena economia aberta: evidências empíricas para o estado do Espírito Santo Commodity prices and activity level in a small open economy: empirical evidence for the State of Espírito Santo

    Directory of Open Access Journals (Sweden)

    Matheus Albergaria de Magalhães

    2011-12-01

    Full Text Available O presente trabalho propõe-se a mensurar, empiricamente, os efeitos de variações nos preços de commodities sobre o nível de atividade do estado do Espírito Santo ao longo do tempo, assim como a comparar os impactos desses preços sobre a economia estadual vis-à-vis à economia nacional e demais estados brasileiros. Os resultados obtidos permitem identificar cinco padrões empíricos distintos: (i por conta de seu alto grau de abertura, o estado do Espírito Santo sente mais intensamente os impactos de choques nos preços de commodities do que o Brasil e outros estados; (ii resultados de testes de Granger-causalidade demonstram que preços de commodities exercem um padrão de precedência temporal sobre os níveis de atividade estadual e nacional; (iii padrão semelhante de precedência temporal também ocorre no caso de amplo conjunto de variáveis econômicas relacionadas ao estado do Espírito Santo; (iv um choque positivo nos preços de commodities faz com que o nível de atividade estadual aumente inicialmente, sofrendo uma contração em seguida, para então apresentar um aumento permanente em relação a seu nível original no longo prazo; (v resultados de um exercício de decomposição da variância demonstram que, em média, os impactos quantitativos de choques nos preços de commodities são maiores no caso estadual do que no caso nacional. Esses resultados são robustos a diversas questões de especificação, como o uso de diferentes transformações estacionárias dos dados e de distintos números de defasagens empregados em testes de Granger-causalidade. São importantes no sentido de gerarem melhor compreensão dos efeitos de oscilações nos preços de commodities sobre uma pequena economia aberta, conforme parece ser o caso do Espírito Santo.This paper aims to measure the effects of commodity price variations on output fluctuations over time in the State of Espírito Santo. The impacts of these prices on the State

  10. Relativity without relativity

    International Nuclear Information System (INIS)

    Barbour, Julian; Foster, Brendan Z; Murchadha, Niall O

    2002-01-01

    We give a derivation of general relativity (GR) and the gauge principle that is novel in presupposing neither spacetime nor the relativity principle. We consider a class of actions defined on superspace (the space of Riemannian 3-geometries on a given bare manifold). It has two key properties. The first is symmetry under 3-diffeomorphisms. This is the only postulated symmetry, and it leads to a constraint linear in the canonical momenta. The second property is that the Lagrangian is constructed from a 'local' square root of an expression quadratic in the velocities. The square root is 'local' because it is taken before integration over 3-space. It gives rise to quadratic constraints that do not correspond to any symmetry and are not, in general, propagated by the Euler-Lagrange equations. Therefore these actions are internally inconsistent. However, one action of this form is well behaved: the Baierlein-Sharp-Wheeler (Baierlein R F, Sharp D and Wheeler J A 1962 Phys. Rev. 126 1864) reparametrization-invariant action for GR. From this viewpoint, spacetime symmetry is emergent. It appears as a 'hidden' symmetry in the (underdetermined) solutions of the Euler-Lagrange equations, without being manifestly coded into the action itself. In addition, propagation of the linear diffeomorphism constraint together with the quadratic square-root constraint acts as a striking selection mechanism beyond pure gravity. If a scalar field is included in the configuration space, it must have the same characteristic speed as gravity. Thus Einstein causality emerges. Finally, self-consistency requires that any 3-vector field must satisfy Einstein causality, the equivalence principle and, in addition, the Gauss constraint. Therefore we recover the standard (massless) Maxwell equations

  11. Esforços de inovação organizacional e qualidade do serviço: um estudo empírico sobre unidades hospitalares Esfuerzos de innovación organizacional y calidad de los servicios: una investigación empírica sobre unidades hospitalarias Organizational innovation and service quality: an empirical analysis on hospital units

    Directory of Open Access Journals (Sweden)

    Marcelino José Jorge

    2013-04-01

    Full Text Available O debate sobre mudança institucional no sistema público de saúde no Brasil tem dispensado pouca atenção à inovação organizacional nas Unidades Hospitalares (UHs. Recorrendo às abordagens da inovação e da informação incompleta na análise econômica, este artigo analisa os dados de uma amostra de conveniência contendo dez relatórios da Acreditação Hospitalar, para confirmar a dinâmica das relações entre a efetividade de normas, rotinas e protocolos, o treinamento de pessoal e a qualidade do serviço nas UHs. Como contribuição teórica, o modelo formulado analisa a relação entre a inovação organizacional, a qualidade do serviço prestado na UH, a expansão da UH e o desenvolvimento do mercado de serviços de saúde. O resultado do modelo é que o efeito da inovação organizacional na qualidade do serviço em UHs de referência é maior do que o efeito dos esforços de treinamento.El debate acerca del cambio institucional en el sistema público de salud en Brasil ha concedido muy poca atención a la innovación organizacional en Unidades Hospitalarias (UHs. Utilizando la óptica del Análisis Económico cuanto a la innovación y a la información incompleta, este trabajo investiga datos originados de una muestra de conveniencia con diez relatos sobre Acreditación Hospitalaria para confirmar la existencia de relaciones entre la calidad de los servicios prestados por UHs, de un lado, y la efectividad de normas, rutinas y protocolos y la formación del personal, de otro lado. En términos teóricos el modelo propuesto contribuye al análisis de la relación entre innovación organizacional, calidad de servicios, crecimiento de UHs y desarrollo del mercado de servicios de salud. Más específicamente, resulta del modelo que el impacto de la innovación organizacional sobre la calidad de los servicios es más fuerte que el efecto de la formación del personal.Recent debate on institutional change in the Brazilian public

  12. Chemical and spectroscopic characteristics of potassium white micas related to polystage evolution of the Central Western Carpathians orogenic wedge

    Science.gov (United States)

    Sulák, Marián; Kaindl, Reinhard; Putiš, Marián; Sitek, Jozef; Krenn, Kurt; Tóth, Ignác

    2009-12-01

    Potassium white micas in sheared basement and cover rocks from the Central Western Carpathians (CWC) were investigated by PL microscopy, electron microprobe (EMP) analysis, Mössbauer and micro-Raman spectroscopy. We specified chemical and spectroscopic characteristics, which allow distinction between celadonite-poor (muscovitic) and celadonite-rich (phengitic) white mica (Wmca). Wmca generations formed during a polystage evolution in changing P- T conditions ranging from the very low to medium temperatures at medium pressure within the Alpidic CWC orogenic wedge. BSE imaging, EMP analyses and X-ray element maps indicate chemical differences between muscovite and phengite, mainly in Al, Fe and Si contents. Mössbauer spectroscopy revealed their contrasting spectra, related to different hyperfine parameters, mainly of quadrupole splitting (QS of Ms: 2.6-2.7 mm/s, or 2.9-3.0 mm/s for Phg), corresponding to Fe 2+ and Fe 3+ contents. Blastomylonitic samples with a single dominating Wmca generation and finite-strain XZ sections were suitable for micro-Raman study. These data corroborate correlation between the frequencies of two vibrational modes of Wmca and Si content. The investigated Wmca generations indicate an enhanced transformation between Wmca phases in shear zones.

  13. Práticas de gestão da cadeia de suprimentos e seus eventuais relacionamentos com as prioridades competitivas da produção: evidências empíricas do setor eletroeletrônico à luz de modelagem de equações estruturais Supply chain management practices and their possible relationships with manufacturing competitive priorities: empirical evidence from electro-electronic industry in light of Structural Equation Modeling

    Directory of Open Access Journals (Sweden)

    Ana Beatriz Lopes de Sousa Jabbour

    2013-06-01

    Full Text Available Este artigo tem como objetivo identificar as práticas de gestão da cadeia de suprimentos que estão sendo adotadas no setor eletroeletrônico brasileiro e verificar se as prioridades competitivas da produção das empresas desse setor se relacionam com a adoção de tais práticas. Desenvolveu-se uma pesquisa empírica, de cunho quantitativo, a partir da realização de uma pesquisa survey por e-mail com gerentes de empresas do setor eletroeletrônico da Associação Brasileira da Indústria Elétrica e Eletrônica. Técnicas estatísticas descritivas e multivariadas de segunda geração (modelagem de equações estruturais foram empregadas para analisar os dados obtidos. Como principais resultados deste artigo destacam-se: a as práticas de gestão da cadeia de suprimentos que estão sendo mais implantadas são voltadas à integração e apoio das atividades de desenvolvimento de produtos com os clientes; e b não foram verificadas relações significativas entre as prioridades competitivas das empresas estudadas e a adoção de práticas de gestão da cadeia de suprimentos.This article aims to identify the supply chain management practices adopted in the Brazilian electronics sector and verify whether manufacturing competitive priorities of companies in this sector relate to the adoption of such practices. An empirical quantitative research was developed based on an e-mail survey with managers of companies in the electronics sector associated with the Brazilian Association of Electrical and Electronics Industry. Descriptive and multivariate statistical techniques of second generation (Structural Equation Modeling were used to analyze the data. Main results showed that: (a the supply chain management practices most deployed are focused on the integration and support of product development activities with customers; and (b no significant relationships between competitive priorities and supply chain management practices were found.

  14. Políticas macroeconómicas, deterioro en el bienestar social y la viabilidad de las Pymes y empresas de economía social para incentivar el desarrollo económico local : un análisis empírico del caso mexicano (1983-2012)

    OpenAIRE

    Mora Heredia, Alfredo

    2013-01-01

    En esta investigación se presentan varios análisis empíricos (cuantitativos) para identificar los efectos de la estrategia económica implementada en México, desde 1983 hasta la fecha, en la reducción de los mínimos de bienestar en la población mexicana. También se propone como estrategia viable incentivar el desarrollo económico desde los ámbitos locales, dando prioridad a la creación de Micro, Pequeña y Mediana empresa (MiPyMIE) y empresas de economía social en los ámbitos regionales más...

  15. Estudio comparativo de las decisiones de los magistrados del Tribunal Supremo español y los resultados de estudios empíricos sobre las implicaciones psicológicas en menores en situación de guarda y custodia compartida

    Directory of Open Access Journals (Sweden)

    Marta Marín

    2017-01-01

    Full Text Available Se toma como referencia la modificación de la Ley 15/2005 en el Código Civil español, donde se introduce el concepto de guarda y custodia compartida por primera vez en España. El objetivo del presente trabajo es establecer si existe una relación entre los resultados de las investigaciones con base empírica y las decisiones judiciales acerca de los efectos que producen en menores la guarda y custodia compartidas. Para ello se ha realizado un análisis cualitativo de las investigaciones relativas a las consecuencias de la custodia compartida, tanto a nivel nacional como internacional. Posteriormente, se han comparado los resultados de las investigaciones con las decisiones de los magistrados, obtenidas tras realizar un análisis de la jurisprudencia de las sentencias del Tribunal Supremo desde el año 2005 hasta el año 2015.

  16. Relational databases

    CERN Document Server

    Bell, D A

    1986-01-01

    Relational Databases explores the major advances in relational databases and provides a balanced analysis of the state of the art in relational databases. Topics covered include capture and analysis of data placement requirements; distributed relational database systems; data dependency manipulation in database schemata; and relational database support for computer graphics and computer aided design. This book is divided into three sections and begins with an overview of the theory and practice of distributed systems, using the example of INGRES from Relational Technology as illustration. The

  17. Social relations

    DEFF Research Database (Denmark)

    Due, P; Holstein, B; Lund, R

    1999-01-01

    We introduce a conceptual framework with social relations as the main concept and the structure and the function of social relations as subconcepts. The structure of social relations covers aspects of formal relations and social network. The function of social relations covers social support......, social anchorage and relational strain. We use this conceptual framework to describe social relations in the Danish population, with questionnaire data from the Danish Longitudinal Health Behaviour Study including a random sample of each of the age groups 25-, 50-, 60-and 70-year olds, N = 2......,011. The postal questionnaires were answered by a random sample in each of the age groups. The results show marked age and gender differences in both the structure and the function of social relations. The social network, measured as weekly contacts, weakens with age and so does instrumental support. Emotional...

  18. Relational Leadership

    DEFF Research Database (Denmark)

    Madsen, Charlotte Øland; Rasmussen, Jørgen Gulddahl

    2015-01-01

    In this chapter, we emphasise what we have outlined as interesting areas of relational leadership and present some ideas on how to facilitate a broader understanding of relational leadership practice. This involves the interpretations that create connections between practice and ontology. We...... elaborate on how leadership in everyday situations can be understood from a relational perspective. The chapter will focus on outlining and inspiring the reader to co-operate with other people to develop further relational understandings of leading....

  19. Special relativity

    International Nuclear Information System (INIS)

    Taylor, J.G.

    1975-01-01

    It is stated that the early chapters review special relativity from an elementary mathematical viewpoint, and include discussion of recent experiments which set out to test Einstein's predictions. The theory of relativity is then reformulated in more sophisticated mathematical language to show its relation to electro-magnetism, and to lay the foundation for more general viewpoints. The final chapter discusses in simple terms where activity in the field is currently centred, and where future interest lies. Chapter headings include: the constant speed of light; measuring time and distance; the Lorentz transformation (relativity of simultaneity, space-time and causality); relativistic kinematics (including - the Dopper effect); relativistic dynamics (including - nuclear binding energy, particle creation, electrodynamics); the structure of special relativity (including - the Lorentz group, the rotation group, elementary particle scattering); extensions of special relativity. (U.K.)

  20. International Relations

    OpenAIRE

    McGlinchey, S.

    2017-01-01

    A ‘Day 0’ introduction to International Relations for beginners. Written by a range of emerging and established experts, the chapters offer a broad sweep of the basic components of International Relations and the key contemporary issues that concern the discipline. The narrative arc forms a complete circle, taking readers from no knowledge to competency. The journey starts by examining how the international system was formed and ends by reflecting that International Relations is always adapti...

  1. Numerical relativity

    CERN Document Server

    Shibata, Masaru

    2016-01-01

    This book is composed of two parts: First part describes basics in numerical relativity, that is, the formulations and methods for a solution of Einstein's equation and general relativistic matter field equations. This part will be helpful for beginners of numerical relativity who would like to understand the content of numerical relativity and its background. The second part focuses on the application of numerical relativity. A wide variety of scientific numerical results are introduced focusing in particular on the merger of binary neutron stars and black holes.

  2. Public relations

    International Nuclear Information System (INIS)

    1998-01-01

    Public relations activities continued in a well-proved form of organizing plant visits and Information Centre off - site activities. Bohunice NPPs were visited by the number of 7294 visitors in 1997. A brief account of activities in public relations carried out by the Nuclear power plants Jaslovske Bohunice in 1997 is presented

  3. Numerical Relativity

    Science.gov (United States)

    Baker, John G.

    2009-01-01

    Recent advances in numerical relativity have fueled an explosion of progress in understanding the predictions of Einstein's theory of gravity, General Relativity, for the strong field dynamics, the gravitational radiation wave forms, and consequently the state of the remnant produced from the merger of compact binary objects. I will review recent results from the field, focusing on mergers of two black holes.

  4. Estimativa por DSC das entalpias de sublimação da etilenouréia e da propilenouréia: algumas correlações empíricas envolvendo amidas e tioamidas

    OpenAIRE

    Farias,Robson Fernandes de

    1999-01-01

    By using DSC data, the enthaplies of sublimation for ethyleneurea and propyleneurea, are calculated as 84 and 89 kJ mol-1 respectively. Using the vaporization enthalpy values for dimethylethyleneurea and dimethylprophyleneurea, as obtained from literature, the empirical relation: Dcrg Hmo (1)/ Dcrg Hmo (2) = Dlg Hmo (1)/ Dlg Hmo(2) = constant, that relate sublimation or vaporization enthalpies of two different substances and of its methylated derivatives, is obtained. Correlations like that a...

  5. General relativity

    International Nuclear Information System (INIS)

    Kenyon, I.R.

    1990-01-01

    General relativity is discussed in this book at a level appropriate to undergraduate students of physics and astronomy. It describes concepts and experimental results, and provides a succinct account of the formalism. A brief review of special relativity is followed by a discussion of the equivalence principle and its implications. Other topics covered include the concepts of curvature and the Schwarzschild metric, test of the general theory, black holes and their properties, gravitational radiation and methods for its detection, the impact of general relativity on cosmology, and the continuing search for a quantum theory of gravity. (author)

  6. Special relativity

    International Nuclear Information System (INIS)

    French, A.P.

    1982-01-01

    This book is an introduction to special relativity theory. After a discussion of the limits of Newton's mechanics and the pecularities in the propagation of light the Lorentz transformation is introduced. Then the measurement of space and time intervals in the framework of relativity theory is considered. Thereafter the addition of velocities and acceleration are considered in this framework. Then relativistic kinematics of particle interactions are described. Then the four-dimensional calculus in space-time coordinates is introduced. Finally an introduction is given to the treatment of the electromagnetic field in the framework of relativity theory. Every chapter contains exercise problems with solutions. This book is suited for all students who want to get some fundamental knowledge about relativity theory. (HSI) [de

  7. Relational Leading

    DEFF Research Database (Denmark)

    Larsen, Mette Vinther; Rasmussen, Jørgen Gulddahl

    2015-01-01

    This first chapter presents the exploratory and curious approach to leading as relational processes – an approach that pervades the entire book. We explore leading from a perspective that emphasises the unpredictable challenges and triviality of everyday life, which we consider an interesting......, relevant and realistic way to examine leading. The chapter brings up a number of concepts and contexts as formulated by researchers within the field, and in this way seeks to construct a first understanding of relational leading....

  8. Uso del suelo, ciclo agrícola y unidades productivas en el suroeste de Antioquia, 1912-1935. Aproximación empírica y comparativa

    Directory of Open Access Journals (Sweden)

    Mario Samper Kutsbach

    1988-07-01

    Full Text Available The paper discusses in a detailed form the current characteristics of the land use and labor force, in wage form as well as familiar, within different types of productive unities in the area under examination related to the period. It returns to the hypothesis of a previous study on the Antioquia south west between 1850-1912, in order to explain the impact of the progressive coffee specialization over the agricultural cycles and over the interaction between direct producers and capital owners. It suggests some possibilities of comparative analysis and certain related of conceptual order.

  9. El papel del agente de empleo y desarrollo local en la implementación de las políticas locales de empleo y en la creación de empresas en España. Estudio empírico y análisis comparativo entre CC.AA.

    Directory of Open Access Journals (Sweden)

    Joan Ramón SANCHIS PALACIO

    2006-01-01

    Full Text Available El Desarrollo Local se está convirtiendo en un tema de gran actualidad, tanto desde el campo académico como desde el campo de la acción en el marco de las iniciativas locales de empleo. Especial relevancia tiene, dentro de este tema, el papel desempeñado por todos aquellos agentes que intervienen en el proceso de Desarrollo Local.El autor de la obra ha realizado un estudio sobre el papel que desempeña el agente de inserción en el contexto del Desarrollo Local a través de un análisis empírico. La obra ofrece una visión amplia y actual de la realidad del Desarrollo Local en España, y presenta un modelo de actuación en el que se recogen diferentes tipos de medidas de mejora de la situación actual y recomendaciones dirigidas tanto a los propios profesionales como a las Administraciones Públicas (Central, Autonómicas y Locales implicadas en el proceso de Desarrollo Local.

  10. Ação profissional dos assistentes sociais no sistema único de assistência social: problematizações resultantes de uma pesquisa empírica no RS = Professional activity of social assistants in the single social assistance system: questionings resulting from empiric research in Rio Grande do Sul

    Directory of Open Access Journals (Sweden)

    Silva, Vini Rabassa da

    2011-01-01

    Full Text Available Este trabalho realiza uma reflexão sobre a ação profissional realizada no Sistema Único de Assistência Social (SUAS a partir de três eixos: os espaços sócio-ocupacionais, os procedimentos usados e o desenvolvimento da autonomia dos usuários. Inicia com uma apresentação da pesquisa sobre seus participantes. Usa dados empíricos obtidos com a aplicação de questionários, realização de entrevistas e discussão realizada em um workshop com alguns assistentes sociais que participaram nos momentos anteriores da pesquisa. Evidencia um período de transição da política, o qual produz novas possibilidades para a ação profissional, porém sem romper com os limites concretos de sua inserção em um modelo neoliberal. Problematiza o CRAS como lócus contraditório que pode favorecer o desenvolvimento de uma autonomia conservadora ou a descoberta de uma consciência de classe direcionada para a busca de uma sociedade justa, democrática e igualitária

  11. ‘La balsa de la medusa’ del Estado benefactor. Una crítica del capital social como sustituto conceptual de la solidaridad y como modelo de desarrollo, desde la interpretación de un estudio empírico

    Directory of Open Access Journals (Sweden)

    Adriana Marrero

    2007-01-01

    Full Text Available En los últimos años, el capital social ha dejado de ser un concepto teórico para expli - car los mecanismos de transmisión y ampliación del capital y de invisibilización de esos procesos, para convertirse en un modelo de desarrollo para los más pobres. Esta transformación, que es con - comitante al retiro del Estado como impulsor de políticas públicas en el contexto del capitalismo global, tiene importantes consecuencias teóricas y prácticas que es necesario examinar con el fin de evaluar su pertinencia y su adecuación para la superación de la pobreza y de la desigualdad social. En este artículo se examinan algunos as - pectos críticos de este modelo, a partir de los re - sultados de una investigación empírica.

  12. Judicialização da política e Sistema Interamericano de Direitos Humanos: uma investigação empírica da atuação das organizações da sociedade civil / Judicialization of Politics and Inter-American Human Rights system

    Directory of Open Access Journals (Sweden)

    Carolina Alves Vestena

    2011-09-01

    Full Text Available Resumo O presente artigo traz análises sobre a terceira fase de pesquisa que vem sendo realizada pelo grupo Direitos Humanos, Poder Judiciário e Sociedade – DHPJS – sobre o sistema de justiça e a atuação de seus agentes no Rio de Janeiro. O foco de observação é a utilização de normas internacionais de direitos humanos pelos tribunais. Nas fases anteriores, juízes e desembargadores foram entrevistados sobre a utilização das normas de direitos humanos em suas decisões, bem como sobre sua formação nessa temática. Nesta etapa, deslocou-se a perspectiva para os demandantes das cortes, especialmente aqueles organizados coletivamente na sociedade civil. Nossa hipótese é a de que as cortes judiciais têm sido provocadas como espaço de disputas, tanto no plano nacional (hipótese que pode ser fundamentada em diversas formulações teóricas quanto no plano internacional. O fenômeno localizado no plano nacional pode ser pensado em termos de sistemas regionais de Direitos Humanos: o sistema interamericano pode estar se constituindo como etapa “para-judicial” para a efetivação desses direitos. Esta segunda hipótese pode ser construída do ponto de vista teórico e testada do ponto de vista empírico, a fim de averiguar se as organizações não governamentais tem utilizado este sistema como uma arena de lutas sociais. A pesquisa empírica realizada pelo grupo trouxe dados para refletir sobre essa hipótese, além de indicar caminhos a serem explorados. Foram entrevistadas 36 ONGs inscritas na ABONG – Associação Brasileira de Organizações Não-Governamentais - que atuam com a defesa de Direitos Humanos para investigar as formas de atuação destes grupos junto ao Judiciário e ao sistema interamericano. No presente artigo apresentamos potenciais relações da judicialização da política com os sistemas regionais de Direitos Humanos, a partir dos dados encontrados na investigação empírica, que revela a utiliza

  13. Nota metodológica sobre el estudio : Socialización, aculturación y competencia intercultural. Un análisis empírico de familias multiculturales (Methodological note on the study :Socialization, acculturation and intercultural competence. An empirical analysis of multicultural families

    Directory of Open Access Journals (Sweden)

    López Monsalve, Begoña

    2008-12-01

    Full Text Available Resumen: Las siguientes páginas presentan brevemente la metodología empleada en el estudio Socialización, aculturación y competencia intercultural. Un análisis empírico de familias multiculturales (SEJ200505034. Se trata de anotaciones metodológicas que exponen algunos de los mayores logros de esta investigación que, con un diseño innovador, aborda un tema de gran relevancia social desde una óptica privilegiada, como es la multiculturalidad vivida en el seno de las familias mixtas; casos cada vez más comunes en la sociedad española actual.Abstract: These pages present the essential methodological points of the research Socialization, acculturation and intercultural competence. An empirical analysis of multicultural families (SEJ200505034. Across the focus of this research It's possible to analyze the multiculturality from a exceptionally perspective: the multiculturalism in home; situations that are being increased in the current Spanish society.

  14. Los diarios de campo en la investigación social: el caso en el estudio 'Socialización, aculturación y competencia intercultural. Un análisis empírico de familias multiculturales' (The field diaries in social research: the study 'Socialization, acculturation and intercultural competence. An empirical analysis of multicultural families'

    Directory of Open Access Journals (Sweden)

    López Monsalve, Begoña

    2008-06-01

    Full Text Available Resumen: El desarrollo de la investigación empírica en el ámbito de las ciencias sociales ofrece la oportunidad de tomar contacto con la realidad en más aspectos, incluso, de los que se prevén en un proyecto. En este texto se presenta, a modo de nota metodológica, algunas de esas llamadas de atención que el mismo desarrollo del trabajo de campo ha ido incorporando en cuanto a la siempre difícil labor de categorización social que, en algunos casos, hace cuestionarse las estandarizaciones sociológicas más básicas referidas a entornos en transformación.Abstract: The empirical research in social sciences offers the opportunity to take contact with the reality across the fieldwork in aspects which some times aren't considered in the beginning. This article presents some of the methodological notes generated during the fieldwork, which inform about the changing societies and the difficulty with some standard social classification.

  15. Linguistic relativity.

    Science.gov (United States)

    Wolff, Phillip; Holmes, Kevin J

    2011-05-01

    The central question in research on linguistic relativity, or the Whorfian hypothesis, is whether people who speak different languages think differently. The recent resurgence of research on this question can be attributed, in part, to new insights about the ways in which language might impact thought. We identify seven categories of hypotheses about the possible effects of language on thought across a wide range of domains, including motion, color, spatial relations, number, and false belief understanding. While we do not find support for the idea that language determines the basic categories of thought or that it overwrites preexisting conceptual distinctions, we do find support for the proposal that language can make some distinctions difficult to avoid, as well as for the proposal that language can augment certain types of thinking. Further, we highlight recent evidence suggesting that language may induce a relatively schematic mode of thinking. Although the literature on linguistic relativity remains contentious, there is growing support for the view that language has a profound effect on thought. WIREs Cogni Sci 2011 2 253-265 DOI: 10.1002/wcs.104 For further resources related to this article, please visit the WIREs website. Copyright © 2010 John Wiley & Sons, Ltd.

  16. General relativity

    International Nuclear Information System (INIS)

    Gourgoulhon, Eric

    2013-01-01

    The author proposes a course on general relativity. He first presents a geometrical framework by addressing, presenting and discussion the following notions: the relativistic space-time, the metric tensor, Universe lines, observers, principle of equivalence and geodesics. In the next part, he addresses gravitational fields with spherical symmetry: presentation of the Schwarzschild metrics, radial light geodesics, gravitational spectral shift (Einstein effect), orbitals of material objects, photon trajectories. The next parts address the Einstein equation, black holes, gravitational waves, and cosmological solutions. Appendices propose a discussion of the relationship between relativity and GPS, some problems and their solutions, and Sage codes

  17. Weak relativity

    CERN Document Server

    Selleri, Franco

    2015-01-01

    Weak Relativity is an equivalent theory to Special Relativity according to Reichenbach’s definition, where the parameter epsilon equals to 0. It formulates a Neo-Lorentzian approach by replacing the Lorentz transformations with a new set named “Inertial Transformations”, thus explaining the Sagnac effect, the twin paradox and the trip from the future to the past in an easy and elegant way. The cosmic microwave background is suggested as a possible privileged reference system. Most importantly, being a theory based on experimental proofs, rather than mutual consensus, it offers a physical description of reality independent of the human observation.

  18. Readable relativity

    CERN Document Server

    Durell, Clement V

    1962-01-01

    Concise and practical, this text by a renowned teacher sketches the mathematical background essential to understanding the fundamentals of relativity theory. Subjects include the velocity of light, measurement of time and distance, and properties of mass and momentum, with numerous diagrams, formulas, and examples, plus exercises and solutions. 1960 edition.

  19. Relative Utilitarianism

    OpenAIRE

    DHILLON, Amrita; MERTENS, Jean-François

    1993-01-01

    In a framework of preferences over lotteries, we show that an axiom system consisting of weakned versions of Arrow’s axioms has a unique solution. “Relative Utilitarianism” consists of first normalizing individual von Neumann-Morgenstern utilities between 0 and 1 and then summing them.

  20. Relative Hypovolaemia

    African Journals Online (AJOL)

    Adele

    the vascular space and the remainder of the extracellular fluid. (ECF) and intracellular ... diuretic therapy are likely to have a relative volume deficiency. Normovolaemia and .... and it is likely that alternative forms of assessment of this crucial measure will be ... necrosis factor and Interleukins1–6, histamine and serotonin.

  1. General Relativity

    CERN Document Server

    Straumann, Norbert

    2013-01-01

    This book provides a completely revised and expanded version of the previous classic edition ‘General Relativity and Relativistic Astrophysics’. In Part I the foundations of general relativity are thoroughly developed, while Part II is devoted to tests of general relativity and many of its applications. Binary pulsars – our best laboratories for general relativity – are studied in considerable detail. An introduction to gravitational lensing theory is included as well, so as to make the current literature on the subject accessible to readers. Considerable attention is devoted to the study of compact objects, especially to black holes. This includes a detailed derivation of the Kerr solution, Israel’s proof of his uniqueness theorem, and a derivation of the basic laws of black hole physics. Part II ends with Witten’s proof of the positive energy theorem, which is presented in detail, together with the required tools on spin structures and spinor analysis. In Part III, all of the differential geomet...

  2. International relations

    International Nuclear Information System (INIS)

    Anon.

    2008-01-01

    Concerning international relations, the different meetings in the field of nuclear safety are reported (Western european nuclear regulator association or Wenra, Nea, IAEA, northern dimension environmental partnership or N.D.E.P., nuclear safety and security group or N.S.S.G., international nuclear regulators association or I.N.R.A.). (N.C.)

  3. Relational Architecture

    DEFF Research Database (Denmark)

    Reeh, Henrik

    2018-01-01

    in a scholarly institution (element #3), as well as the certified PhD scholar (element #4) and the architectural profession, notably its labour market (element #5). This first layer outlines the contemporary context which allows architectural research to take place in a dynamic relationship to doctoral education...... a human and institutional development going on since around 1990 when the present PhD institution was first implemented in Denmark. To be sure, the model is centred around the PhD dissertation (element #1). But it involves four more components: the PhD candidate (element #2), his or her supervisor...... and interrelated fields in which history, place, and sound come to emphasize architecture’s relational qualities rather than the apparent three-dimensional solidity of constructed space. A third layer of relational architecture is at stake in the professional experiences after the defence of the authors...

  4. International Relations:

    DEFF Research Database (Denmark)

    This is the textbook for the Open University module International Relations: Continuity and Change in Global Politics. Instead of leading with a succession of theoretical 'isms', the module structures its presentation of the subject around six teaching ‘blocks’, each of which explores a dilemma...... • Block 6: Continuity or change in global politics? Each block introduces new IR theories through discussions of the substantive dilemmas and adds in a layered way levels of analysis and conceptual complexity......., or dimension of variation. The dilemmas in question were chosen for the way they capture key themes in the field of International Studies (IR) as well as central aspects of the ‘international’ itself (ir). The six Blocks are: • Block 1: Co-operation or conflict? Introducing international relations • Block 2...

  5. Relational topology

    CERN Document Server

    Schmidt, Gunther

    2018-01-01

    This book introduces and develops new algebraic methods to work with relations, often conceived as Boolean matrices, and applies them to topology. Although these objects mirror the matrices that appear throughout mathematics, numerics, statistics, engineering, and elsewhere, the methods used to work with them are much less well known. In addition to their purely topological applications, the volume also details how the techniques may be successfully applied to spatial reasoning and to logics of computer science. Topologists will find several familiar concepts presented in a concise and algebraically manipulable form which is far more condensed than usual, but visualized via represented relations and thus readily graspable. This approach also offers the possibility of handling topological problems using proof assistants.

  6. Numerical relativity

    International Nuclear Information System (INIS)

    Piran, T.

    1982-01-01

    There are many recent developments in numerical relativity, but there remain important unsolved theoretical and practical problems. The author reviews existing numerical approaches to solution of the exact Einstein equations. A framework for classification and comparison of different numerical schemes is presented. Recent numerical codes are compared using this framework. The discussion focuses on new developments and on currently open questions, excluding a review of numerical techniques. (Auth.)

  7. EMP Interaction: Principles, Techniques and Reference Data (A Compleat concatenation of Technology from the EMP Interaction Notes). EMP Interaction 2-1

    Science.gov (United States)

    1980-12-01

    staff of Dikewood, Santa Monica, no. only has contributed a large amount of material to this document, but also proofread the typescript . In...assistance and skills in the preparation of the entire typescript . Dikewood Industries, Inc. K.S.H. LEE Santa Monica, California September, 1979 xJ

  8. Public relations

    International Nuclear Information System (INIS)

    1996-01-01

    At Nuclear Regulatory Authority of the Slovak Republic (NRA SR), the public relations belongs to the secretariat of the Chairman, and are a part of the policy of carefully planned and purposeful efforts to establish mutual relations between the authority and the public. A spokesmen of NRA SR is in charge of the public relations. The spokesman is ready, without a useless filibuster and based on a particular requirement, to inform governmental bodies, other national bodies and organizations, embassies and international organizations, the public and news media in case of an event at a nuclear installation. To provide for communications activities, NRA SR constructed and opened the Information centre with a particular equipment in autumn 1995, that has already started communications with some dailies, broadcasting, television and Press Agency SR. It has been envisaged that there will be press conferences held in the Information centre a few times a year, or NRA SR senior staff may be interviewed here on extraordinary events at NPPs, or on some other important occasions in NRA SR. In 1995, NRA Sr issued the Annual report in a few variants - each suitable for different use - on NRA SR activities and nuclear safety of Slovak nuclear power plants as of 1994. The NRA SR's Bulletin has started to be published with periodicity of 3 times a year, focusing on NRA SR activities both in Slovakia and abroad. NRA SR Information centre provides foreign visitors with independent propagation and information materials about the issue of nuclear safety enhancement at operational Slovak NPPs. Furthermore, the Information centre provides both the NRA SR's residences in Bratislava and Trnava with daily press monitoring of topical news

  9. Training Relations

    DEFF Research Database (Denmark)

    Smith, Aja

    This thesis explores the phenomenon of horse-assisted leadership training and the manners, in which the training relations between horses, managers and facilitators were entangled with perceptions of, what “proper sociality” entailed and felt like in contemporary Danish society. The study...... is positioned at the intersection of anthropology and consumer culture research and is based upon 15 months of ethnographic fieldwork in fields, offices and conference rooms throughout Denmark in 2012 and 2013 as well as reading of emic literature and marketing material. The main argument of the thesis is...

  10. Basic relativity

    CERN Document Server

    Mould, Richard A

    1994-01-01

    This comprehensive textbook develops in a logical and coherent way both the formalism and the physical ideas of special and general relativity. Part one focuses on the special theory and begins with the study of relativistic kinematics from three points of view. Part two begins with a chapter introducing differential geometry. Subsequent chapters cover: rotation, the electromagnetic field, and material media. A second chapter on differential geometry provides the background for Einstein's gravitational-field equation and Schwarzschild's solution. The book is aimed at advanced undergraduates and beginning graduate students in physics or astrophysics.

  11. Establishing the Empirical Relationship Between Non-Science Majoring Undergraduate Learners' Spatial Thinking Skills and Their Conceptual Astronomy Knowledge. (Spanish Title: Estableciendo Una Relación Empírica Entre el Razonamiento Espacial de los Estudiantes de Graduación de Carreras no Científicas y su Conocimento Conceptual de la Astronomía.) Estabelecendo Uma Relação Empírica Entre o RacioCínio Espacial dos Estudantes de Graduação EM Carreiras Não Científicas e Seu Conhecimento Conceitual da Astronomia

    Science.gov (United States)

    Heyer, Inge; Slater, Stephanie J.; Slater, Timothy F.

    2013-12-01

    The astronomy education community has tacitly assumed that learning astronomy is a conceptual domain resting upon spatial thinking skills. As a first step to formally identify an empirical relationship, undergraduate students in a non-major introductory astronomy survey class at a mediumsized, Ph.D. granting, mid-western US university were given pre- and post-astronomy conceptual diagnostics and spatial reasoning diagnostics, Instruments used were the "Test Of Astronomy Standards" and "What Do You Know?" Using only fully matched data for analysis, our sample consisted of 86 undergraduate non-science majors. Students' normalized gains for astronomy surveys were low at .26 and .13 respectively. Students' spatial thinking was measured using an instrument designed specifically for this study. Correlations between the astronomy instruments' pre- to post-course gain scores and the spatial assessment instrument show moderate to strong relationships suggesting the relationship between spatial reasoning and astronomy ability can explain about 25% of the variation in student achievement. La comunidad de educación en astronomía ha supuesto de forma tácita que el aprendizaje de la astronomía consiste en un dominio conceptual fundamentado en el razonamiento espacial. Como un primer paso para identificar formalmente una relación empírica entre estas dos cosas, utilizamos como muestra los estudantes de graduación de carreras no científicas de un curso experimental en una universidad norteamericana del medioeste de porte mediano con programa de Doctorado em curso, en el cual estos estudiantes se sometieron a un diagnóstico de razonamiento espacial y conceptos astronómicos antes e después del mismo. Las herramientas utilizadas fueron el Test Of Astronomy Standards (TOAST) y el cuestionario What do you know? Utilizando solo los datos completamente consistentes para este análisis, nuestra muestra consistió en 86 estudantes de graduación. Las mejoras, depués de

  12. Relatives and Relations in Paluai’

    DEFF Research Database (Denmark)

    Schokkin, Dineke; Otto, Ton

    2017-01-01

    This paper discusses the expression of kinship in Paluai (Baluan-Pam, ISO 639-3: blq), an Oceanic language spoken on Baluan Island, Manus Province, Papua New Guinea. Based on data gathered during extensive fieldwork, the authors first consider the formal characteristics of nominal possessive cons...... of birth order terms, which are a relatively rare phenomenon, and the partial replacement of the system by terms from the creole language Tok Pisin....

  13. Esas empeñadas luchas a que son muy aficionados los naturales de este país: un acercamiento a la etnicidad a través de la lucha canaria (1840-1943

    Directory of Open Access Journals (Sweden)

    Alonso, Víctor

    2016-06-01

    Full Text Available Sports in general, and traditional sports in particular, make a key contribution to the processes linked to the configuration of any identity. These activities can be studied as a reality «in its own right» (with a certain relative autonomy, as a part of a specific social subject, or as a diacritical social matter that enables us to characterize structures and social processes which, over time, could favour the changes, meanings and visions, whether considered legitimate or maligned, that are contained in these practices. This article deals with the traditional sport of lucha canaria [Canary-island wrestling], which has proved a revealing historical construct, to the extent that this popular game turned sports discipline underwent intense transformation during the 19th and early- 20th centuries. Its analysis provides an insight into the different social meanings, supports and principles associated with this activity, revealing a complex space of relations where the indigenous Guanche, historical tradition and an ongoing link with modernity are particularly relevant. All of this endorses the debate in recent decades in social anthropology and the social sciences regarding ethnicity, identity and sports.El deporte, y especialmente los deportes tradicionales, son una contribución de primer orden a los procesos de construcción identitaria. Puede ser estudiado como realidad «en sí» (dotada de relativa autonomía, al modo de un campo social específico, o bien en modo de diacrítico social que permite caracterizar unas estructuras y procesos sociales que, a lo largo del tiempo, favorecen las transformaciones, sentidos y visiones legitimadas o denostadas contenidas en las prácticas. Este artículo trata la lucha canaria, un deporte tradicional que se manifiesta como constructo histórico revelador, al tratarse de un juego popular deportivizado que vive una intensa transformación a lo largo del siglo XIX y las primeras décadas del XX. Su

  14. O ensino da Contabilidade Internacional em cursos de graduação no Brasil: uma pesquisa empírica sobre o perfil dos docentes e recursos didáticos e metodológicos adotados

    Directory of Open Access Journals (Sweden)

    Tiago Henrique de Souza Echternacht

    2009-12-01

    Full Text Available A contabilidade é cada vez mais exigida a fornecer informações legíveis e transparentes em qualquer parte do mundo, como resultado do mercado de capitais globalizado. Organizações internacionais de contabilidade tais como a IFAC – Federação Internacional de Contadores, ISAR – Grupo de Trabalho Intergovernamental de Padrões Internacionais de Contabilidade e Relatórios, IASB – Junta de Padrões Internacionais de Contabilidade estão desenvolvendo esforços no sentido de promover o desenvolvimento do conhecimento e habilidades que permitam a profissão contábil ter condições adequadas para atender aos usuários, fornecendo informações úteis sobre a apresentação das demonstrações contábeis seguindo princípios, métodos e padrões internacionais de contabilidade. É compreensível que quanto mais forte a similaridade entre o curriculum internacional e o local, mais forte a evidência da harmonização da educação contábil nesse país. A principal proposta deste trabalho é analisar os recursos didáticos e metodológicos adotados pelos professores da disciplina Contabilidade Internacional nas instituições de ensino superior brasileiras.

  15. Increasing power and taking a lead - What are practitioners really doing? Empirical evidence from European communications managers/Incrementar el poder y asumir el liderazgo - ¿Qué hacen realmente los profesionales? Evidencias empíricas sobre los gestores de comunicación en Europa

    Directory of Open Access Journals (Sweden)

    Ángeles Moreno

    2014-05-01

    ón de comunicación en el mundo. El ECM es un proyecto de investigación anual desde 2007. El ECM recogió datos cuantitativos mediante una encuesta online a 2.209 profesionales de 43 países europeos con representación de todas las regiones europeas. El artículo presenta conexiones originales sobre la teoría previa y se ofrecen evidencias empíricas sobre el poder vertical y horizontal de los departamentos de comunicación en las organizaciones. A pesar de las limitaciones de ser una encuesta de autopercepción estas evidencias abren nuevas direcciones de investigación sobre las dimensiones jerárquica y social del poder. Pretende profundizar en la comprensión del poder de la gestión de comunicación en las organizaciones. Concretamente, pretende desarrollar conocimiento y comprensión sobre el poder horizontal y vertical y las relaciones que estas dimensiones de poder establecen con los roles estratégicos, los estilos de toma de decisiones y los estilos de liderazgo que desempeñan los comunicadores. Se presentan así ideas originales a través de la crítica y la re-visión de la literatura y teorías sobre el poder y el liderazgo en las organizaciones junto con nuevos datos empíricos para apoyar estos argumentos.

  16. Special relativity

    CERN Document Server

    Faraoni, Valerio

    2013-01-01

    This book offers an essential bridge between college-level introductions and advanced graduate-level books on special relativity. It begins at an elementary level, presenting and discussing the basic concepts normally covered in college-level works, including the Lorentz transformation. Subsequent chapters introduce the four-dimensional worldview implied by the Lorentz transformations, mixing time and space coordinates, before continuing on to the formalism of tensors, a topic usually avoided in lower-level courses. The book’s second half addresses a number of essential points, including the concept of causality; the equivalence between mass and energy, including applications; relativistic optics; and measurements and matter in Minkowski spacetime. The closing chapters focus on the energy-momentum tensor of a continuous distribution of mass-energy and its covariant conservation; angular momentum; a discussion of the scalar field of perfect fluids and the Maxwell field; and general coordinates. Every chapter...

  17. Community relations

    International Nuclear Information System (INIS)

    O'Neil, C.

    1997-01-01

    The interaction of the oil and gas companies with the Northern communities regarding drilling activities was an important aspect of oil and gas operations conducted in the Beaufort Sea. During the 1960s the industry and aboriginal people basically ignored each other. Later, the industry put more emphasis on community consultation until finally two-way communication was established. Respect for the land and the environment were very important to aboriginal people who depended on the land and its resources for their traditional way of life. Community relations policies by the various companies involved in the area, and the impact they have had on their respective communities were recounted. Not all efforts were successful, however, the companies and the communities learned from their experiences, and by the time operations ceased, the communities seemed to be more appreciative of the ways they were being treated by the oil companies. 22 figs

  18. Numerical relativity

    CERN Document Server

    Nakamura, T

    1993-01-01

    In GR13 we heard many reports on recent. progress as well as future plans of detection of gravitational waves. According to these reports (see the report of the workshop on the detection of gravitational waves by Paik in this volume), it is highly probable that the sensitivity of detectors such as laser interferometers and ultra low temperature resonant bars will reach the level of h ~ 10—21 by 1998. in this level we may expect the detection of the gravitational waves from astrophysical sources such as coalescing binary neutron stars once a year or so. Therefore the progress in numerical relativity is urgently required to predict the wave pattern and amplitude of the gravitational waves from realistic astrophysical sources. The time left for numerical relativists is only six years or so although there are so many difficulties in principle as well as in practice.

  19. De columbine à virgínia tech: reflexões com base empírica sobre um fenômeno em expansão From columbine to virgínia tech: empirical based reflections about an expanding phenomenon

    Directory of Open Access Journals (Sweden)

    Timoteo Madaleno Vieira

    2009-01-01

    Full Text Available O fenômeno conhecido como school shooting vem chamando a atenção do mundo, principalmente após a tragédia na Columbine High School, na cidade de Littleton, Colorado, nos Estados Unidos, em 1999. Posteriormente, em abril de 2007, o estudante Cho Seung-Hui protagonizou um massacre de proporções ainda maiores ao atirar contra estudantes do Virginia Polytechnic Institute and State University, matando 32 pessoas e se suicidando ao final. O presente artigo reflete sobre o fenômeno chamando a atenção para a sua expansão pelo mundo e traz uma reflexão, baseada em dados empíricos, sobre o desenvolvimento dos protagonistas dos massacres em seus contextos sociais, incluindo o ambiente familiar, a mídia e interações entre colegas nas escolas e universidades.School shooting phenomenon has attracted attention throughout the world, especially after the Columbine massacre in April, 1999. In that event, 12 people died and about 30 were hurt. Some years later, in April 2007, Cho Seung-Hui carried out an even more impressive deed, shooting and killing 32 people at Virginia Polytechnic Institute and State University, USA. This article presents school shooting as a growing phenomenon that may happen anywhere and not just in the United States. A reflection based on empirical research is presented focusing the development of school shooters in their social contexts, including home environment, media influence, and inter-students interactions in High Schools and universities.

  20. Empirical evaluation of three machine learning method for automatic classification of neoplastic diagnoses Evaluación empírica de tres métodos de aprendizaje automático para clasificar automáticamente diagnósticos de neoplasias

    Directory of Open Access Journals (Sweden)

    José Luis Jara

    2011-12-01

    Full Text Available Diagnoses are a valuable source of information for evaluating a health system. However, they are not used extensively by information systems because diagnoses are normally written in natural language. This work empirically evaluates three machine learning methods to automatically assign codes from the International Classification of Diseases (10th Revision to 3,335 distinct diagnoses of neoplasms obtained from UMLS®. This evaluation is conducted on three different types of preprocessing. The results are encouraging: a well-known rule induction method and maximum entropy models achieve 90% accuracy in a balanced cross-validation experiment.Los diagnósticos médicos son una fuente valiosa de información para evaluar el funcionamiento de un sistema de salud. Sin embargo, su utilización en sistemas de información se ve dificultada porque éstos se encuentran normalmente escritos en lenguaje natural. Este trabajo evalúa empíricamente tres métodos de Aprendizaje Automático para asignar códigos de acuerdo a la Clasificación Internacional de Enfermedades (décima versión a 3.335 diferentes diagnósticos de neoplasias extraídos desde UMLS®. Esta evaluación se realiza con tres tipos distintos de preprocesamiento. Los resultados son alentadores: un conocido método de inducción de reglas de decisión y modelos de entropía máxima obtienen alrededor de 90% accuracy en una validación cruzada balanceada.

  1. Dimensões de imagem de loja que explicam a avaliação e a satisfação dos consumidores: um estudo empírico em uma rede de varejo de cosméticos do interior paulista

    Directory of Open Access Journals (Sweden)

    Helenita Rodrigues da Silva Tamashiro

    2017-04-01

    Full Text Available Considerado uma das maiores e mais diversas indústrias do mundo, o varejo vive uma revolução que está transformando o modo simples de negociar, em uma forma automatizada e sofisticada de gestão, nas áreas de logística, controle de estoque e procedimentos operacionais. Neste cenário, a imagem de loja constitui importante ferramenta de marketing que possibilita identificar os atributos com maior influência na satisfação dos consumidores. Nessa perspectiva, o objetivo da presente pesquisa foi identificar as dimensões de imagem de loja explicam a percepção e a avaliação dos consumidores. Para tanto, num primeiro momento realizou-se uma revisão bibliográfica sobre o tema proposto para identificar as dimensões contempladas no instrumento de pesquisa. Posteriormente foi realizada uma pesquisa empírica, por meio de uma abordagem descritiva dos dados, os quais foram obtidos a partir de 302 questionários válidos. A população-alvo foi definida como sendo os clientes de uma rede de cosméticos. No processo de análise foi aplicado o coeficiente Alpha de Cronbach e a técnica multivariada de análise fatorial exploratória para purificação dos dados, aplicando-se em seguida, a correlação de Pearson para testar as hipóteses de pesquisa. Os resultados obtidos deixam evidências de que há uma associação positiva e significativa entre dimensões analisadas.

  2. Mathematical modelling of the drying of jatropha fruit: an empirical comparison Modelagem matemática da secagem dos frutos de pinhão-manso: uma comparação empírica

    Directory of Open Access Journals (Sweden)

    Valdiney Cambuy Siqueira

    2013-06-01

    Full Text Available The jatropha has emerged on the world scene as a promising plant for the production of biodiesel. However, this crop still lacks the development of specific equipment for its processing, particularly post-harvest. Therefore, the aim of this work was to fit different mathematical models to experimental data obtained while drying jatropha fruits, and to recommend the one that best represents the facts. Jatropha fruit with a moisture content of 4.4 (kg moisture kg-1 dry matter were subjected to drying in a greenhouse with forced air-ventilation at five temperature conditions: 45; 60; 75; 90 and 10 ºC and relative humidities of 14.5; 7.4; 3.8; 2.2 and 1.4%, respectively, until reaching a moisture content of 0.10 ± 0.005 (kg moisture kg-1 dry matter,with three replications. Ten mathematical models, used to represent the drying of agricultural products, were adjusted to fit the experimental drying data. The models were analyzed using the coefficient of determination, chi-square, mean relative error, mean estimated error and residual distribution. It can be concluded that the Page model satisfactorily describes the kinetics of jatropha-fruit drying, at temperatures of 60; 75; 90 and 105 ºC. However, drying at a temperature of 45 ºC produced different behavior, making necessary the adjustment of a new model to describe the phenomenon.O pinhão-manso tem se destacado no cenário mundial como planta promissora para a produção de biodiesel. No entanto, esta cultura ainda carece do desenvolvimento de equipamentos específicos para o seu processamento, principalmente na fase pós-colheita. Sendo assim, objetivou-se com o presente trabalho ajustar diferentes modelos matemáticos aos dados experimentais obtidos na secagem dos frutos de pinhão-manso e recomendar aquele que melhor representa o fenômeno. Os frutos de pinhão-manso com o teor de água de 4,40 (kg de água kg-1 de matéria seca, foram submetidos à secagem em estufa com ventilação de ar

  3. ¿Eco-innovación, una evolución de la innovación? Análisis empírico en la industria cerámica española

    Directory of Open Access Journals (Sweden)

    Segarra-Oña, M.

    2011-10-01

    Full Text Available Innovation and sustainable development are considered to be economic drivers and crucial in fixing competitive position of companies. Eco-innovation, known as a synergic relation among both concepts must be an element to consider when designing the company´s strategy. The objective of this paper is to analyze which are the variables that determine that innovative companies go beyond and consider the improvement of their environmental impact as an output when developing innovating activities. This research considers firms belonging to the Spanish tile industry. Data has beeen provided by PITEC Database. The paper identifies the moderating factors that influence the eco-innovative behavior of firms.

    La innovación y el desarrollo sostenible se consideran motores económicos cruciales en la fijación de la posición competitiva de las empresas. La eco-innovación, entendida como relación sinérgica entre ambos conceptos, debe ser un elemento a considerar en el diseño de la estrategia de las empresas. El objetivo de este trabajo es analizar cuáles son las variables que determinan que las empresas innovadoras vayan más allá y consideren la mejora del impacto ambiental como un objetivo al desarrollar actividades innovadoras. En este trabajo se analizan las empresas pertenecientes al sector cerámico español. Los datos provienen de la base de datos PITEC. El documento identifica los factores moderadores que influyen en el comportamiento eco- innovador de las empresas.

  4. Diferencias entre áreas científicas en las prácticas de divulgación de la investigación: un estudio empírico en el CSIC

    Directory of Open Access Journals (Sweden)

    Olmos-Peñuela, Julia

    2014-06-01

    Full Text Available A range of governmental and institutional scientific policies have emerged in recent decades to promote the dissemination of scientific knowledge throughout society. This article explores the involvement of researchers in various types of dissemination and identifies practices and differences among scientific fields. The study analyses a large sample of researchers from eight scientific fields of the Spanish Council for Scientific Research (CSIC, who were surveyed about their participation in diverse dissemination activities. Two indicators related to individual and institutional dissemination activities were constructed from a factor analysis. The ANOVA test indicates different dissemination patterns between researchers in social sciences and humanities and those from experimental science fields, though the difference is not very marked. These results may be of interest for the future focus of actions to promote scientific dissemination.En las últimas décadas se han comenzado a desarrollar políticas gubernamentales e institucionales para la promoción de la divulgación del conocimiento científico. Este artículo explora la implicación de los investigadores en diversos tipos de actividades de divulgación, para identificar si se producen diferencias entre las diferentes áreas científicas. El estudio analiza una muestra amplia de investigadores pertenecientes a las ocho áreas científicas del Consejo Superior de Investigaciones Científicas (CSIC, a los que se ha realizado una encuesta sobre su participación en distintas actividades de divulgación. Mediante un análisis factorial se han construido dos indicadores que agrupan, respectivamente, las actividades de divulgación de carácter individual e institucional. Un contraste ANOVA permite identificar diferencias entre investigadores de ciencias humanas y sociales e investigadores de las ciencias experimentales, pero no muy acusadas. Los resultados pueden ser de interés para el

  5. La utilización efectiva de los factores cualitativos de la materialidad: un análisis empírico para los ausitores de cuentas ejercientes en España

    Directory of Open Access Journals (Sweden)

    Ana Fernándes-Laviada

    2008-06-01

    Full Text Available Organismos internacionales como la SEC (1999 y la IFAC (2006 han mostrado una gran preocupación por las graves consecuencias que la incorrecta aplicación de la materialidad tiene sobre la calidad de la información financiera publicada por las empresas. El propósito de este trabajo es analizar la predisposición de los auditores españoles a introducir salvedades en sus informes a causa de incidencias situadas por debajo de los niveles cuantitativos de materialidad si éstas se relacionan con ciertos factores de naturaleza cualitativa. Los resultados obtenidos, basados en las respuestas de 338 profesionales ejercientes, permiten identificar tres grupos de auditores con distinto grado de conservadurismo, es decir, con distinta inclinación hacia la utilización efectiva de la vertiente cualitativa de la materialidad (permisivos, moderados y severos. Además, variables como la edad, la formación académica, la facturación de la firma y el número y tipo de empresas auditadas, ayudan a explicar la propensión de los auditores a pertenecer a uno de estos grupos.International organizations such as the SEC (1999 and the IFAC (2006 have shown a great concern about the serious consequences that misapplication of materiality has on the quality of financial information published by companies. The aim of this paper is to analyze the predisposition of Spanish auditors towards issuing qualified audit reports due to uncorrected misstatements lower than the quantitative materiality levels if they relate to some qualitative factors. The results obtained, based on the responses from 338 practising professionals, allow to identify three groups of auditors with different degree of conservatism, that is, with different inclination to the effective use of the qualitative side of materiality (permissive, moderate and strict. Furthermore, variables as the age, academic training, firm turnover, and number and kind of companies audited, assist to explain the

  6. Implicaciones en el Análisis de la Información sobre la Fusión: Evidencia Empírica de la Utilización Alternativa de los Métodos Contables

    Directory of Open Access Journals (Sweden)

    Teresa Apellániz Gómez

    1999-12-01

    pooling of interest methods for all variables used, suggesting that financial statements differ under the two methods. However, when the logit regression was used for the multivariate analysis, the differences between the two methods were found statistically significant only for goodwill relative total assets and growth in profitability. Furthermore, the research findings imply that there is considerable management discretion regarding the choice of accounting method for mergers in Spain.

  7. Las relaciones fabricante distribuidor como elementos básicos de un modelo competitivo en el caso del cluster cerámico español. Análisis empírico de los factores moderadores

    Directory of Open Access Journals (Sweden)

    Albors Garrigós, J.

    2008-12-01

    Full Text Available The tile ceramic industry, as other traditional industries, is immersed in a context of constant changes driven by relevant competition world-wide. The distribution function is not an exception and is playing an increasing role in a global economy. On the other hand, the abundance of information and easy access to products and services is forcing distributors and traditional intermediaries to search new forms to relate with buyers and salesmen through mechanisms which guarantee the final end user complete satisfaction. This paper objective is exploring the influence and role of distribution channels in the creation of value in the case of Spanish tile ceramic industry. In this direction three moderating factors in the model have been analyzed: market oriented activities; strategic exchange of information with manufacturers; and offer of complementary services by distributors to final clients.

    La industria cerámica, como otras industrias tradicionales, se encuentra inmersa en un contexto de constantes cambios marcado por una importante competencia a nivel mundial. La función distribución no es una excepción y viene cobrando un rol cada vez más relevante en la economía globalizada. Por otra parte, la proliferación de información y su fácil acceso sobre productos y servicios esta obligando a los distribuidores e intermediarios tradicionales a buscar nuevas formas de relacionar a compradores y vendedores a través de mecanismos que garanticen la completa satisfacción del usuario final. Este trabajo tiene como objeto explorar la influencia y el rol de los canales de distribución en la creación de valor en el sector cerámico español. En este sentido se analizan tres factores moderadores en el modelo: Actividades de orientación al mercado; intercambio de información estratégica con fabricantes; y servicios complementarios ofrecidos al cliente final.

  8. Análise empírica de modelos de valuation no ambiente brasileiro: fluxo de caixa descontado versus modelo de Ohlson (RIV Empirical analysis of valuation models in the brazilian environment: discounted cash flow versus Ohlson's model

    Directory of Open Access Journals (Sweden)

    Fernando Caio Galdi

    2008-08-01

    .e. equity analysts to calculate equity values. Additionally, we evaluate what model (DCF or OHLSON better explains the Price-to-Book relation for future periods. Conclusions are: i there are statistically significant differences for estimates of equity value when using discounted cash flow models and residual income models, and ii Price-to-Book ratios calculated through discounted cash flow models have higher explanatory power for future Price-to-Book ratios than the estimates of this ratio using residual income valuation models.

  9. Endogeneidade do setor financeiro e crescimento econômico: uma análise empírica para a economia brasileira (1980-2003 Endogeneity of financial sector and economic growth: an empirical analyze of the Brasilian economy

    Directory of Open Access Journals (Sweden)

    Eliane Cristina de Araújo

    2006-12-01

    Full Text Available O presente trabalho apresenta um modelo teórico de quatro setores que endogeiniza o setor financeiro da economia submetendo-o às decisões das famílias e do governo. Como resultado, temos que as variáveis monetárias taxa de juros, política de reservas bancárias e imposto inflacionário influenciam o crescimento econômico. Essa relação foi estimada para a economia brasileira a partir da metodologia de Vetores Auto-Regressivos (VAR e dos testes de exogeneidade fraca e forte. Esses testes revelaram que a taxa de juros e o imposto inflacionário possuem uma relação endógena com a taxa de crescimento da economia e afetam somente a sua variabilidade. No entanto, a política de reservas bancárias apresentou-se como exógena, tendo efeitos permanentes sobre essa mesma taxa. Em resumo, a política de reservas bancárias determina o montante de empréstimos da economia, que conseqüentemente influencia o crescimento econômico. Nossas estimações indicaram que a elevação em 10 pontos percentuais na alíquota de reservas bancárias reduz a taxa de crescimento da economia em até 1,2%.The objective of this paper is to build a four sector model that make the financial sector endogenous and under the influence of families and government policies. As a result, the long run economic growth is influenced by monetary variables like the size of bank reserves, interest rates and inflationary tax. This model was empirically estimated through Auto-regressive Vector (VAR and submitted to exogeneity tests. The results were that interest rate and inflationary tax are endogenously related to economic growth and affect only its variability. However, the bank reserve policy is exogenous to this variable and showed to have permanent effect on it, more specifically, in sum, the reserve bank policy set the amount of loan in the economy and it influences economic growth. Our estimation indicates that the rise of the bank reserve in 10 points might reduce the

  10. International relations

    International Nuclear Information System (INIS)

    Anon.

    2009-01-01

    The French nuclear safety authority (A.S.N.) has participated at different meeting in European Union as nuclear decommissioning assistance programme(N.D.A.P.), Regulatory assistance management group (R.A.M.G.) and Instrument for nuclear safety cooperation (I.N.S.C.). The members of Western European nuclear regulator association (W.E.N.R.A.) met and discussed about the future of W.E.N.R.A. and its representativeness and its cooperation with European nuclear safety regulator group (E.N.S.R.E.G.) and head of European radiation control authorities (H.E.R.C.A.). About International relations it is to noticed a meeting at the invitation of IAEA to discuss about the possibility to resort to the Ines scale for medical events. An audit mission under the IAEA aegis stood at Fessenheim, O.S.A.R.T. for operational safety review team. Two years and a half passed by between the audit mission Integrated regulatory review service (I.R.S.S.) welcome by A.S.N. in november 2006 and the audit mission follow up in 2009, 12 experts from 11 different countries and coordinated by three representatives of IAEA worked, the conclusions were that 90% of recommendations made to A.S.N. in 2006 were treated in a satisfying way; the evaluation gives three new recommendations, 7 new suggestions and 11 new correct practices. A meeting of the commission on safety standards (C.S.S.) stood in april 2009. Some others meeting are to be noticed: nuclear safety and security group (N.S.S.G.), expert group on nuclear and radiation safety (E.G.N.R.S.) instituted by the council of the Baltic sea states (C.B.S.S.) treats data exchange on the national networks of dose rates and surveillance of radioactivity in air. International nuclear regulator association (I.N.R.A.) held its first meeting in april 2009 at Seoul (Korea). Bilateral relations with Poland, Italy, Ukraine and Germany planed cooperation or information exchange in the field of nuclear safety. Participation to conference in Usa, meetings with United

  11. A prefilled injection device for outreach tetanus immunization by Bolivian traditional birth attendants Vacunación antitetánica extrainstitucional por parteras empíricas bolivianas mediante dispositivos desechables de una sola dosis

    Directory of Open Access Journals (Sweden)

    Rosario Quiroga

    1998-07-01

    Full Text Available This study evaluated the performance, acceptability, and appropriateness of a new, single-use, prefilled injection device called UniJect™ for an outreach immunization application.6 Between April and June 1995, UniJect devices were used by 36 traditional birth attendants to administer tetanus toxoid injections to 2 240 pregnant women during routine, antenatal home visits in the Northern, Ichilos, and Warnes Districts of Santa Cruz, Bolivia. Because tetanus toxoid is relatively heat stable, the traditional birth attendants were able to keep the tetanus toxoid-filled UniJect devices in their homes for up to one month without refrigeration. The devices were stored, transported, and disposed of in an outreach carrier designed to reduce the risks of improper handling and disposal. Data were collected from injection recipients, traditional birth attendants, and supervisors via observation, questionnaires, and post-study interviews. The performance of the UniJect device and its acceptability among all groups was very high. The traditional birth attendants used UniJect properly and safely; there were no reports or observations of device misuse, reuse, or needle-stick. Advantages cited included the fact that the device required no assembly, offered assured sterility, and reduced vaccine wastage sometimes associated with multi-dose vials. The ability to store and transport the vaccine-filled devices without ice also greatly simplified logistics.En este estudio se evaluaron el rendimiento, la aceptabilidad y la conveniencia de la inmunización antitetánica extrainstitucional con un nuevo dispositivo hipodérmico de una sola dosis, el UniJect®. De abril a junio de 1995, el dispositivo UniJect aprestado de fábrica con una sola dosis de toxoide tetánico fue utilizado por 36 parteras tradicionales para vacunar a 2 240 mujeres embarazadas durante las visitas domiciliarias prenatales de rutina en los distritos Norte, Ichilos y Warnes de Santa Cruz, Bolivia

  12. Adopción contingente de tecnología de producción en el sector cerámico español. Un estudio empírico

    Directory of Open Access Journals (Sweden)

    Albors, J.

    2006-10-01

    Full Text Available Strategy and management literature has considered situational factors as a basis for a contingency theory of firm management. Firm production technology strategies follow this trend and tend to adapt to the firm competitive context. This paper will try to demonstrate this hypothesis in the case of the tile ceramic industry in Spain. This industry concentrates in a very competitive cluster in the East of Spain. However the globalisation perspective has brought new global competitors from East Asia. This fact, a changing customer environment and the industry process characteristics, shape technology production strategies with demand situational factors rather than with firm objectives. Considering this scenario, two surveys were carried out by the authors covering a representative sample of the industry. These contemplated the firm’s reply to questions related to management, design and marketing as well as technology production strategies. The statistical analysis of the survey results concluded in a classification of the industry firms according to their strategies as well as to their financial economic results in defined groups. The study concluded also that firm survival would depend on the firm tendency to adapt flexible and proactive strategies (technology and marketing wise aligned with their competitive environment.

    La literatura de estrategia y gestión ha considerado los factores situacionales como la base de la teoría de contingencia en la gestión de empresas. Las estrategias de tecnología de producción siguen esta pauta y tienden a adaptarse al contexto competitivo de la organización. Este trabajo tratará de demostrar esta hipótesis en el caso de la industria cerámica española. Este sector se concentra en un cluster muy competitivo en la Comunidad Valenciana. Sin embargo, la perspectiva de la globalización ha traído a escena nuevos competidores en el ámbito mundial, como por ejemplo del Este asiático. Este hecho

  13. Spin-Related Micro-Photoluminescence in Fe3+ Doped ZnSe Nanoribbons

    Directory of Open Access Journals (Sweden)

    Lipeng Hou

    2016-12-01

    Full Text Available Spin-related emission properties have important applications in the future information technology; however, they involve microscopic ferromagnetic coupling, antiferromagnetic or ferrimagnetic coupling between transition metal ions and excitons, or d state coupling with phonons is not well understood in these diluted magnetic semiconductors (DMS. Fe3+ doped ZnSe nanoribbons, as a DMS example, have been successfully prepared by a thermal evaporation method. Their power-dependent micro-photoluminescence (PL spectra and temperature-dependent PL spectra of a single ZnSe:Fe nanoribbon have been obtained and demonstrated that alio-valence ion doping diminishes the exciton magnetic polaron (EMP effect by introducing exceeded charges. The d-d transition emission peaks of Fe3+ assigned to the 4T2 (G → 6A1 (S transition at 553 nm and 4T1 (G → 6A1 (S transition at 630 nm in the ZnSe lattice have been observed. The emission lifetimes and their temperature dependences have been obtained, which reflected different spin–phonon interactions. There exists a sharp decrease of PL lifetime at about 60 K, which hints at a magnetic phase transition. These spin–spin and spin–phonon interaction related PL phenomena are applicable in the future spin-related photonic nanodevices.

  14. Variáveis Contingenciais aos Métodos de Valoração dos Produtos: estudo empírico em PME’S industriais portuguesasContingent Variables to the Valuation Product Methods: empirical study of industrial portuguese SMEsVariables Contingenciales a los Métodos de Valoración de los Productos: estudio empírico en PME’S industriales portuguesas

    Directory of Open Access Journals (Sweden)

    MACHADO, Maria João Cardoso Vieira

    2011-12-01

    Full Text Available RESUMOA teoria da contingência é baseada na premissa de que não há um sistema de contabilidade ideal que se aplique da mesma forma a todas as organizações, tudo depende de diversos fatores contingenciais. Os estudos já realizados permitem identificar diversas variáveis contigenciais aos métodos de contabilidade de gestão, no entanto nenhum desses estudos se dirigiu a Pequenas e Médias Empresas (PME’s, o que justifica investigação que permita concluir se estas variáveis contigenciais, já estabilizadas na teoria, também o são se analisarmos empresas de pequena dimensão. Os objetivos deste estudo estão relacionados com a identificação de relações entre o método de valoração dos produtos utilizados pelas PME’s e três variáveis contingenciais: a dimensão das empresas; o tipo de produção; a detenção do capital. Foram encontradas relações estatisticamente significativas entre a dimensão das empresas e os métodos de valoração dos produtos. Os dados recolhidos sugerem ainda existir uma relação entre a forma como as empresas valoram os produtos e o fato de produzirem para “stock” ou por encomenda, no entanto o reduzido número de observações não permitiu validar estatisticamente esta evidência. Relativamente à detenção do capital, a informação recolhida mostra que não existe nenhuma relação entre o tipo de sociedade e o método de valoração dos produtos.ABSTRACTThe contingency theory is based on the premise that there is an ideal accounting system that applies equally to all organizations; it all depends on several contingent factors. Studies have identified several variables contingency methods of management accounting, however, none of these studies addressed the Small and Medium Enterprises (SMEs, which justifies research to conclude whether these variables contingency, now established in theory, are the same if we look at small businesses. The objectives of this study are related to the

  15. Literacia fiscal : um estudo empírico

    OpenAIRE

    Pereira, Ana Isabel Teixeira Duarte

    2014-01-01

    O objetivo desta dissertação prende-se com o estudo da literacia fiscal numa zona rural de Portugal. Aqui se aborda a importância da perceção fiscal que o contribuinte deveria possuir para uma melhor atuação perante situações fiscais com que se depara no seu quotidiano, em seu benefício. O presente trabalho versa também sobre fatores que influenciam o (in)cumprimento fiscal por parte do cidadão contribuinte. A educação fiscal tem impacto no cumprimento fiscal no sentido de que transmite o ...

  16. DNA EMP Awareness Course Notes. Supplement to Third Edition.

    Science.gov (United States)

    1978-07-31

    produce withes then ctomagnet fedsnn the- additional interior fields (SGEMP) and anseles enor i strcin te veoiat chas TRE effects through interaction of...ATTN: R. Plebuch ATTN: B. Gasten ATTN: 0. Adams ATTN: G. Carpenter ATTN: H. Holloway ATTN: W. Gargaro Systems, Science & Software, Inc. ATTN: L

  17. 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)

  18. 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)

  19. Collateral Damage to Satellites from an EMP Attack

    Science.gov (United States)

    2010-08-01

    field into regions of weak magnetic field [Stern. 1989, and references therein]. Birkeland’s work captured the interest of auroral researcher Stormer ...dipole magnetic field [ Stormer , 1907]. Although mathematically elegant, Stormer theory did not prove the existence of radiation belts; it set the stage...Based on work by Stormer , Alfven, and others, and on his experience with the Astron thermonuclear device, N. Christofolis in October 1957 suggested

  20. Análise empírica da prática de insider trading em processos de fusões e aquisições recentes na economia brasileira Empirical analysis of insider trading in recent brazilian mergers and acquisitions

    Directory of Open Access Journals (Sweden)

    Marcos Antônio de Camargos

    2008-12-01

    Full Text Available As negociações com uso de informações privilegiadas (insider trading criam oportunidades para que alguns agentes do mercado lucrem em detrimento de outros, levando a uma transferência de riqueza entre os acionistas. O anúncio de uma fusão ou aquisição é um momento oportuno para essa prática, visto que quase sempre causa impactos significativos nas expectativas dos agentes do mercado e nos preços dos títulos. Este artigo analisou se essa prática esteve presente em processos de fusões e aquisições recentes, realizados por grandes empresas brasileiras, utilizando-se de um estudo de evento para o qual, além da análise do retorno acionário anormal, fez-se a comparação de médias de variáveis sinalizadoras do comportamento dos títulos no mercado (liquidez. Para a análise foram utilizadas ações preferenciais, ordinárias e os American Depositary Receipts (ADRs de dez empresas diferentes. Foi encontrada evidência empírica da prática de insider trading no retorno acionário anormal e na quantidade de negociações, além de se observarem indícios dessa prática nas demais variáveis analisadas, o que sinaliza que ocorreu um aumento da liquidez dos títulos analisados antes do anúncio.Insider trading creates opportunities for some agents in the market to profit in detriment of others thereby transferring wealth between shareholders. Announcement of a merger or acquisition is an opportunity for this practice as it usually causes significant price changes and impacts stock market expectations of these agents. An analysis was made to detect insider trading in recent mergers and acquisitions by large Brazilian companies, An Event Study searched for abnormal returns and compared averages of variables signaling behavior in the market (liquidity for common and preferred stocks as well as American Depositary Receipts of ten companies. Empirical analysis identified insider trading by abnormal returns and volumes of trading with

  1. Custos na prestação de serviço público de saúde do município de São João do Oeste - SC: um estudo empírico

    Directory of Open Access Journals (Sweden)

    Marino Luiz Eyerkaufer

    2008-03-01

    Full Text Available Objetiva-se identificar o custo da prestação de serviço público do transporte depacientes para fora do Município da Secretaria da Saúde de São João do Oeste – SC visando concluir pela sua manutenção sob responsabilidade direta do município, ou então, pela sua terceirização. Trata-se de um estudo teórico e empírico, que se caracteriza como descritivo e quantitativo. Por meio de coleta documental, chegou-se aos dados numéricos municipais, como viagens realizadas, pacientes transportados, veículos utilizados neste transporte e mão-de-obra direta e indireta, envolvidas neste tipo de prestação de serviço nos meses de abril, maio, junho e julho de 2006. Aplicou-se questionário às empresas do setor, interessadas em prestar o serviço de forma terceirizada. Para atender ao objetivo proposto e dar sustentação ao tema, buscou-se na literatura conceitos de: contabilidade, contabilidade de custo, análise de custos, prestação de serviços, sistemas de custo, métodos de custeio, contabilidade pública, serviços públicos, terceirização, terceirização no setor público e saúde pública. Conclui-se, por meio da pesquisa, que o custo da prestação do serviço público de transporte de pacientes da Secretaria Municipal de Saúde de São João do Oeste - SC é elevado, porém, está abaixo do custo orçado para a terceirização, devendo a municipalidade optar pela manutenção do serviço.

  2. Visualização dos padrões de variação da taxa de mortalidade infantil no Rio Grande do Sul, Brasil: comparação entre as abordagens Bayesiana Empírica e Totalmente Bayesiana Patterns of variation in the infant mortality rate in Rio Grande do Sul State, Brazil: comparison of empirical Bayesian and fully Bayesian approaches

    Directory of Open Access Journals (Sweden)

    Sabrina Letícia Couto da Silva

    2011-07-01

    Full Text Available A mortalidade infantil é um sensível indicador de saúde. Conhecer o seu perfil geográfico auxilia na formulação de estratégias de saúde pública. O mapeamento de doenças tem por objetivo descrever a distribuição geográfica das taxas de mortalidade ou incidência de doenças por intermédio de mapas. Em razão da alta instabilidade das taxas brutas quando há pequenas áreas, utilizam-se os métodos de suavização bayesiana, que se valem de informações de toda a região ou da vizinhança para estimar as taxas. O artigo faz a comparação entre os métodos Bayesiano Empírico e Totalmente Bayesiano para as taxas de mortalidade infantil (dados acumulados de 2001 a 2004 no Rio Grande do Sul, Brasil. O trabalho aponta as vantagens do uso dos estimadores bayesianos na visualização espacial dos mapas. Os métodos Bayesianos Empíricos apresentaram resultados muito semelhantes aos dos métodos Totalmente Bayesianos e possuem a grande vantagem de ser de fácil utilização por profissionais da área de saúde, destacando igualmente os principais padrões espaciais da taxa de mortalidade no Rio Grande do Sul no período estudado.Infant mortality is considered a sensitive health indicator, and knowledge of its geographical profile is essential for formulating appropriate public health policies. Disease mapping aims to describe the geographical distribution of disease incidence and mortality rates. Due to the heavy instability of crude rates in small areas, methods involving Bayesian smoothing of rates are used, drawing on information for the whole area or neighborhood to estimate the event rate. The current study compares empirical Bayesian (EB and fully Bayesian (FB methods for infant mortality rates (accumulated data from 2001 to 2004 in Rio Grande do Sul State, Brazil. This study highlights the advantages of Bayesian estimators for viewing and interpreting maps. For the problem at hand, EB and FB methods showed quite similar results and

  3. "Trabajo productivo, relación Precio/valor y tasa de plusvalía: puntos de vista teóricos y evidencia empírica con base en los Estados Unidos de América (1948-1987 y países de la comunidad económica europea (1960/70-1986" Productive labour, priceivalue ratio and rate of surplus-value: theoretical view, points and empirical evidence on the USA (1948-1987 and E.E.C. countries (1960/70/1986.

    Directory of Open Access Journals (Sweden)

    Gouverneur Jacques

    1990-12-01

    Full Text Available

    Presentando datos provenientes de la economía de los Estados Unidos (1948-1987 y la Comunidad Econ6mica Europea (1960/70-1986 como soporte empírico, el articulo busca aportar algunos elementos teóricos y metodológicos al debate sobre la tasa de plusvalía: En la primera parte se presenta la posición del autor acerca del controvertido debate sobre el valor sin hacer una revisión exhaustiva de éste. La segunda sección se ocupa del examen de la relación existente entre la suma total de los precios y la suma total de los valores considerando las conexiones que ésta establece entre magnitudes monetarias y magnitudes de trabajo y el método utilizado para estimarlas. En tercer lugar se consideran los problemas relacionados con la medición de la tasa de plusvalía para establecer luego la relación entre la forma y medidas basadas en los datos de las cuentas nacionales evaluando su papel Se estiman aquí el nivel y evolución de la tasa de plusvalía en los E.E. U. U. Y la C.E.E. Por último, se ofrece un método que busca analizar la evolución de los factores que afectan la tasa de plusvalía aplicándolos a los mismos países.

    Presenting as empirical support data on the economies ofthe United States (1948-1987 and the European Economic Community (1960/70-86 the essay seeks to contribute with theoretical and methodological elements to the debate on the theory of the rate of surplus-value. The first section of the essay presents the author's position in respect to the debate on the theory of value, without an exhaustive revision. The second section refers to the relationship that exists between the addition of 'prices and of values taklng into account the relationships that are established between monetary and labour magnitudes as well as the methods used to simulate them. Section three refers to problems related to the measurement of the rate of surplus-value in order to establish the relationship between forms and measures based

  4. Social relations: network, support and relational strain

    DEFF Research Database (Denmark)

    Due, P; Holstein, B; Lund, Rikke

    1999-01-01

    We introduce a conceptual framework with social relations as the main concept and the structure and the function of social relations as subconcepts. The structure of social relations covers aspects of formal relations and social network. The function of social relations covers social support......,011. The postal questionnaires were answered by a random sample in each of the age groups. The results show marked age and gender differences in both the structure and the function of social relations. The social network, measured as weekly contacts, weakens with age and so does instrumental support. Emotional...... support is unrelated to this decline in contact frequency and appears to be at the same level for younger and older individuals. Relational strain, measured as conflicts, declines with age for all kinds of social relations. The weakening of the social network with age does not seem to affect the level...

  5. Incorporating Relation Paths in Neural Relation Extraction

    OpenAIRE

    Zeng, Wenyuan; Lin, Yankai; Liu, Zhiyuan; Sun, Maosong

    2016-01-01

    Distantly supervised relation extraction has been widely used to find novel relational facts from plain text. To predict the relation between a pair of two target entities, existing methods solely rely on those direct sentences containing both entities. In fact, there are also many sentences containing only one of the target entities, which provide rich and useful information for relation extraction. To address this issue, we build inference chains between two target entities via intermediate...

  6. Visualizing relativity: The OpenRelativity project

    Science.gov (United States)

    Sherin, Zachary W.; Cheu, Ryan; Tan, Philip; Kortemeyer, Gerd

    2016-05-01

    We present OpenRelativity, an open-source toolkit to simulate effects of special relativity within the popular Unity game engine. Intended for game developers, educators, and anyone interested in physics, OpenRelativity can help people create, test, and share experiments to explore the effects of special relativity. We describe the underlying physics and some of the implementation details of this toolset with the hope that engaging games and interactive relativistic "laboratory" experiments might be implemented.

  7. What Are Related Disorders?

    Science.gov (United States)

    ... The Marfan Foundation Marfan & Related Disorders What is Marfan Syndrome? What are Related Disorders? What are the Signs? ... Contact Us Donate Marfan & Related Disorders What is Marfan Syndrome? What are Related Disorders? What are the Signs? ...

  8. Oscillating red giants in eclipsing binary systems: empirical reference value for asteroseismic scaling relation

    Science.gov (United States)

    Themeßl, N.; Hekker, S.; Southworth, J.; Beck, P. G.; Pavlovski, K.; Tkachenko, A.; Angelou, G. C.; Ball, W. H.; Barban, C.; Corsaro, E.; Elsworth, Y.; Handberg, R.; Kallinger, T.

    2018-05-01

    The internal structures and properties of oscillating red-giant stars can be accurately inferred through their global oscillation modes (asteroseismology). Based on 1460 days of Kepler observations we perform a thorough asteroseismic study to probe the stellar parameters and evolutionary stages of three red giants in eclipsing binary systems. We present the first detailed analysis of individual oscillation modes of the red-giant components of KIC 8410637, KIC 5640750 and KIC 9540226. We obtain estimates of their asteroseismic masses, radii, mean densities and logarithmic surface gravities by using the asteroseismic scaling relations as well as grid-based modelling. As these red giants are in double-lined eclipsing binaries, it is possible to derive their independent dynamical masses and radii from the orbital solution and compare it with the seismically inferred values. For KIC 5640750 we compute the first spectroscopic orbit based on both components of this system. We use high-resolution spectroscopic data and light curves of the three systems to determine up-to-date values of the dynamical stellar parameters. With our comprehensive set of stellar parameters we explore consistencies between binary analysis and asteroseismic methods, and test the reliability of the well-known scaling relations. For the three red giants under study, we find agreement between dynamical and asteroseismic stellar parameters in cases where the asteroseismic methods account for metallicity, temperature and mass dependence as well as surface effects. We are able to attain agreement from the scaling laws in all three systems if we use Δνref, emp = 130.8 ± 0.9 μHz instead of the usual solar reference value.

  9. Tests Related to Pregnancy

    Science.gov (United States)

    ... to learn. Search form Search Tests related to pregnancy You are here Home Testing & Services Testing for ... to Genetic Counseling . What Are Tests Related to Pregnancy? Pregnancy related testing is done before or during ...

  10. Pioneers as Relational Subjects? Probing Relationality as ...

    African Journals Online (AJOL)

    relational engagement roles in driving the energy transition, as described on their website. ... He comments, 'In Japan, they call it Viking leadership,' .... island, such as the mayor, representatives of different business, leading employees at the.

  11. Public Relations and Marketing.

    Science.gov (United States)

    Savage, Daniel D.

    1987-01-01

    Urges community colleges to adopt pro-active public relations strategies. Examines the role of the public information officer in such areas as coordination of public relations and marketing activities, relations with media, and the development of a comprehensive public relations plan. (AYC)

  12. Functional Programming With Relations

    OpenAIRE

    Hutton, Graham

    1991-01-01

    While programming in a relational framework has much to offer over the functional style in terms of expressiveness, computing with relations is less efficient, and more semantically troublesome. In this paper we propose a novel blend of the functional and relational styles. We identify a class of "causal relations", which inherit some of the bi-directionality properties of relations, but retain the efficiency and semantic foundations of the functional style.

  13. Introduction to relation algebras relation algebras

    CERN Document Server

    Givant, Steven

    2017-01-01

    The first volume of a pair that charts relation algebras from novice to expert level, this text offers a comprehensive grounding for readers new to the topic. Upon completing this introduction, mathematics students may delve into areas of active research by progressing to the second volume, Advanced Topics in Relation Algebras; computer scientists, philosophers, and beyond will be equipped to apply these tools in their own field. The careful presentation establishes first the arithmetic of relation algebras, providing ample motivation and examples, then proceeds primarily on the basis of algebraic constructions: subalgebras, homomorphisms, quotient algebras, and direct products. Each chapter ends with a historical section and a substantial number of exercises. The only formal prerequisite is a background in abstract algebra and some mathematical maturity, though the reader will also benefit from familiarity with Boolean algebra and naïve set theory. The measured pace and outstanding clarity are particularly ...

  14. Theoretical general relativity: 1979

    International Nuclear Information System (INIS)

    Bergmann, O.

    1979-01-01

    The metric and field equations of Einstein's general relativity theory are written down. Solutions to the equations are discussed. Connection is made between relativity theory and elementary particle theory. Possibilities for a unified field theory are considered

  15. Relativity simply explained

    CERN Document Server

    Gardner, Martin

    2012-01-01

    Since the publication of Einstein's Special Theory of Relativity in 1905, the discovery of such astronomical phenomena as quasars, pulsars, and black holes - all intimately connected to relativity - has provoked a tremendous upsurge of interest in the subject. This volume, a revised version of Martin Gardner's earlier Relativity for the Million, brings this fascinating topic up to date. Witty, perceptive, and easily accessible to the general reader, it is one of the clearest and most entertaining introductions to relativity ever written.

  16. Localización empresarial en Aragón: una aplicación empírica de la ayuda a la decisión multicriterio tipo ELECTRE I y III. Robustez de los resultados obtenidos = Industrial Location Decisions in Aragon: an Empirical Application of a Multi-criterion Methodology of Aid to the Decision using ELECTRE Methods I and III. Robustness of the Obtained Results

    Directory of Open Access Journals (Sweden)

    García Cebrián, Lucía Isabel

    2009-01-01

    Full Text Available La decisión de la localización es una de las opciones estratégicas más importantes que tienen que tomar las empresas, con influencia directa sobre su competitividad. Por este motivo, se han desarrollado numerosas metodologías que ayudan en la toma de estas decisiones. En este trabajo, se realiza una aplicación empírica de una metodología de ayuda a la decisión multicriterio; específicamente, se ha optado por el método ELECTRE en sus versiones I y III, con el fin de seleccionar el mejor emplazamiento para una empresa. Para esta aplicación, se utilizan como alternativas de localización las Comarcas de Aragón, como factores de localización se utilizan 8 criterios y como peso o importancia de esos factores los obtenidos mediante una encuesta. Además, se aporta evidencia sobre la consistencia de los resultados obtenidos. Como se aprecia en el trabajo, aunque la tipología de los problemas a los que van destinados ambos métodos son distintos, los resultados obtenidos pueden ser considerados como consistentes. = The location decision is one of the most important strategic decisions that have to take the firms, with direct influence on their competitiveness. For this reason, many methodologies have been developed to help in the decision making. In this paper, we make an empirical application of a multi-criterion methodology of aid to the decision; specifically, ELECTRE method has been chosen in its versions I and III, in order to select the best place for a firm. The alternatives are counties in Aragon (Spain, and we use eight criteria. The weight has been obtained by surveys. In addition, evidence is contributed about the consistency of the obtained results. Though the typology of the problems to which both methods are destined are different, the obtained results can be considered consistent.

  17. The hypothesis of wealth maximization for stockholders during mergers and acquisitions - an empirical analysis of Brazilian stocks after the real plan Análise empírica da hipótese de maximização da riqueza dos acionistas nos processos de fusão e aquisição ocorridos no mercado de capitais brasileiro pós-plano real

    Directory of Open Access Journals (Sweden)

    Marcos Antônio de Camargos

    2005-12-01

    Full Text Available The concept of creating wealth for stockholders through stock price increases usually accompanies a merger or acquisition. This ongoing appeal continues to be defended by those demonstrating such price increases and is contested by adversaries. Analyses were made of the market reaction and return of open companies on the Brazilian stock exchange, BOVESPA, after mergers and acquisitions between July 1994 and July 2002 based upon abnormal returns close to the press releases. The method used was the Event-Study and statistical treatment made use of the One-Way ANOVA and T test (One-Sample Test. Mergers and acquisitions analyzed had no statistically significant impact on the price of the stocks although there was a tendency for abnormal returns to recede after press releases, so that no real gains resulted, contrary to this hypothesis of wealth maximization.A lógica subjacente a um processo de fusão ou aquisição geralmente é a potencial criação de riqueza para os acionistas na forma de valorização acionária. Trata-se de um tema recorrente, ainda permeado por embates de estudiosos que defendem ou encontraram evidências empíricas de valorização das ações, contra os que a contestam. O artigo avaliou a reação do mercado e a rentabilidade de ações de companhias adquirentes de capital aberto brasileiras que passaram por processos de fusão ou aquisição no âmbito do mercado da BOVESPA, entre julho de 1994 e julho de 2002, por meio da análise de retornos anormais em períodos próximos a cada anúncio. A metodologia utilizada foi um Estudo de Evento. No tratamento estatístico foram utilizados os testes One-Way ANOVA e o Teste T para uma amostra (One-Sample Test. Concluiu-se que os processos de fusão ou aquisição estudados não causaram impactos significativos estatisticamente no preço das ações, apesar da tendência de queda da média dos retornos anormais após a divulgação do evento, e que esses processos não resultaram

  18. Nothing but relativity

    International Nuclear Information System (INIS)

    Pal, Palash B

    2003-01-01

    We deduce the most general space-time transformation laws consistent with the principle of relativity. Thus, our result contains the results of both Galilean and Einsteinian relativity. The velocity addition law comes as a by-product of this analysis. We also argue why Galilean and Einsteinian versions are the only possible embodiments of the principle of relativity

  19. Transit labor relations guide

    Science.gov (United States)

    2001-09-01

    This report is designed as a guide for those involved in labor relations in the transit industry. It begins with a history of transit labor relations. The economic, political, and legal environment of transit relations is then discussed. A section fo...

  20. Relativity and cosmology

    CERN Document Server

    Kaufmann, William J

    1973-01-01

    The foundations of gravitational theory ; the birth of relativity theory ; the foundations of general relativity ; experimental tests of relativity ; the meaning of the redshift ; the black hole ; wormholes and white holes ; galaxies and quasars ; gravitational waves ; the shape of the Universe ; the creation of the Universe.

  1. A Bigraph Relational Model

    DEFF Research Database (Denmark)

    Beauquier, Maxime; Schürmann, Carsten

    2011-01-01

    In this paper, we present a model based on relations for bigraphical reactive system [Milner09]. Its defining characteristics are that validity and reaction relations are captured as traces in a multi-set rewriting system. The relational model is derived from Milner's graphical definition...

  2. Rayleigh reciprocity relations: Applications

    International Nuclear Information System (INIS)

    Lin Ju; Li Xiao-Lei; Wang Ning

    2016-01-01

    Classical reciprocity relations have wide applications in acoustics, from field representation to generalized optical theorem. In this paper we introduce our recent results on the applications and generalization of classical Rayleigh reciprocity relation: higher derivative reciprocity relations as a generalization of the classical one and a theoretical proof on the Green’s function retrieval from volume noises. (special topic)

  3. Elements of relativity theory

    International Nuclear Information System (INIS)

    Lawden, D.F.

    1985-01-01

    The book on elements of relativity theory is intended for final year school students or as an early university course in mathematical physics. Special principle of relativity, lorentz transformation, velocity transformations, relativistic mechanics, and general theory of relativity, are all discussed. (U.K.)

  4. Relativity theory and gravitation

    International Nuclear Information System (INIS)

    Bondi, H.

    1986-01-01

    The paper on relativity theory and gravitation is presented as a preface to the first of the articles submitted to the Journal on general relativity. Newtonian gravitation and and observation, relativity, and the sources of the gravitational field, are all discussed. (UK)

  5. Spin-exciton interaction and related micro-photoluminescence spectra of ZnSe:Mn DMS nanoribbon.

    Science.gov (United States)

    Hou, Lipeng; Zhou, Weichang; Zou, Bingsuo; Zhang, Yu; Han, Junbo; Yang, Xinxin; Gong, Zhihong; Li, Jingbo; Xie, Sishen; Shi, Li-Jie

    2017-03-10

    For their spintronic applications the magnetic and optical properties of diluted magnetic semiconductors (DMS) have been studied widely. However, the exact relationships between the magnetic interactions and optical emission behaviors in DMS are not well understood yet due to their complicated microstructural and compositional characters from different growth and preparation techniques. Manganese (Mn) doped ZnSe nanoribbons with high quality were obtained by using the chemical vapor deposition (CVD) method. Successful Mn ion doping in a single ZnSe nanoribbon was identified by elemental energy-dispersive x-ray spectroscopy mapping and micro-photoluminescence (PL) mapping of intrinsic d-d optical transition at 580 nm, i.e. the transition of 4 T 1 ( 4 G) →  6 A 1 ( 6 s),. Besides the d-d transition PL peak at 580 nm, two other PL peaks related to Mn ion aggregates in the ZnSe lattice were detected at 664 nm and 530 nm, which were assigned to the d-d transitions from the Mn 2+ -Mn 2+ pairs with ferromagnetic (FM) coupling and antiferromagnetic (AFM) coupling, respectively. Moreover, AFM pair formation goes along with strong coupling with acoustic phonon or structural defects. These arguments were supported by temperature-dependent PL spectra, power-dependent PL lifetimes, and first-principle calculations. Due to the ferromagnetic pair existence, an exciton magnetic polaron (EMP) is formed and emits at 460 nm. Defect existence favors the AFM pair, which also can account for its giant enhancement of spin-orbital coupling and the spin Hall effect observed in PRL 97, 126603(2006) and PRL 96, 196404(2006). These emission results of DMS reflect their relation to local sp-d hybridization, spin-spin magnetic coupling, exciton-spin or phonon interactions covering structural relaxations. This kind of material can be used to study the exciton-spin interaction and may find applications in spin-related photonic devices besides spintronics.

  6. Regulation of Lactobacillus plantarum contamination on the carbohydrate and energy related metabolisms of Saccharomyces cerevisiae during bioethanol fermentation.

    Science.gov (United States)

    Dong, Shi-Jun; Lin, Xiang-Hua; Li, Hao

    2015-11-01

    During the industrial bioethanol fermentation, Saccharomyces cerevisiae cells are often stressed by bacterial contaminants, especially lactic acid bacteria. Generally, lactic acid bacteria contamination can inhibit S. cerevisiae cell growth through secreting lactic acid and competing with yeast cells for micronutrients and living space. However, whether are there still any other influences of lactic acid bacteria on yeast or not? In this study, Lactobacillus plantarum ATCC 8014 was co-cultivated with S. cerevisiae S288c to mimic the L. plantarum contamination in industrial bioethanol fermentation. The contaminative L. plantarum-associated expression changes of genes involved in carbohydrate and energy related metabolisms in S. cerevisiae cells were determined by quantitative real-time polymerase chain reaction to evaluate the influence of L. plantarum on carbon source utilization and energy related metabolism in yeast cells during bioethanol fermentation. Contaminative L. plantarum influenced the expression of most of genes which are responsible for encoding key enzymes involved in glucose related metabolisms in S. cerevisiae. Specific for, contaminated L. plantarum inhibited EMP pathway but promoted TCA cycle, glyoxylate cycle, HMP, glycerol synthesis pathway, and redox pathway in S. cerevisiae cells. In the presence of L. plantarum, the carbon flux in S. cerevisiae cells was redistributed from fermentation to respiratory and more reducing power was produced to deal with the excess NADH. Moreover, L. plantarum contamination might confer higher ethanol tolerance to yeast cells through promoting accumulation of glycerol. These results also highlighted our knowledge about relationship between contaminative lactic acid bacteria and S. cerevisiae during bioethanol fermentation. Copyright © 2015 Elsevier Ltd. All rights reserved.

  7. Decreasing Relative Risk Premium

    DEFF Research Database (Denmark)

    Hansen, Frank

    relative risk premium in the small implies decreasing relative risk premium in the large, and decreasing relative risk premium everywhere implies risk aversion. We finally show that preferences with decreasing relative risk premium may be equivalently expressed in terms of certain preferences on risky......We consider the risk premium demanded by a decision maker with wealth x in order to be indifferent between obtaining a new level of wealth y1 with certainty, or to participate in a lottery which either results in unchanged present wealth or a level of wealth y2 > y1. We define the relative risk...... premium as the quotient between the risk premium and the increase in wealth y1–x which the decision maker puts on the line by choosing the lottery in place of receiving y1 with certainty. We study preferences such that the relative risk premium is a decreasing function of present wealth, and we determine...

  8. Relational aggression in marriage.

    Science.gov (United States)

    Carroll, Jason S; Nelson, David A; Yorgason, Jeremy B; Harper, James M; Ashton, Ruth Hagmann; Jensen, Alexander C

    2010-01-01

    Drawing from developmental theories of relational aggression, this article reports on a study designed to identify if spouses use relationally aggressive tactics when dealing with conflict in their marriage and the association of these behaviors with marital outcomes. Using a sample of 336 married couples (672 spouses), results revealed that the majority of couples reported that relationally aggressive behaviors, such as social sabotage and love withdrawal, were a part of their marital dynamics, at least to some degree. Gender comparisons of partner reports of their spouse's behavior revealed that wives were significantly more likely to be relationally aggressive than husbands. Structural equation modeling demonstrated that relational aggression is associated with lower levels of marital quality and greater marital instability for both husbands and wives. Implications are drawn for the use of relational aggression theory in the future study of couple conflict and marital aggression. (c) 2010 Wiley-Liss, Inc.

  9. Strategi Komunikasi Public Relations

    OpenAIRE

    Artis, Artis

    2011-01-01

    Living man in interrelates society. Relationship among human being done by gets communication so man one by another one mutually understand and influence regard for the benefit, it that always been practiced by Public Relations( liaison) in a governance and also firm institute to reach to the effect which ices. The institute of Public Relations declares for,”Public Relations is overall effort which be passed off by design and berkesenambungan in order to creates and pet keenness and mutual un...

  10. Relative Thinking Theory

    OpenAIRE

    Ofer H. Azar

    2005-01-01

    The article presents a theory that I denote “Relative Thinking Theory,” which claims that people consider relative differences and not only absolute differences when making various economics decisions, even in those cases where the rational model dictates that people should consider only absolute differences. The article reviews experimental evidence for this behavior, summarizing briefly several experiments I conducted, as well as some earlier related literature. It then discusses how we can...

  11. Motion and relativity

    CERN Document Server

    Infeld, Leopold

    1960-01-01

    Motion and Relativity focuses on the methodologies, solutions, and approaches involved in the study of motion and relativity, including the general relativity theory, gravitation, and approximation.The publication first offers information on notation and gravitational interaction and the general theory of motion. Discussions focus on the notation of the general relativity theory, field values on the world-lines, general statement of the physical problem, Newton's theory of gravitation, and forms for the equation of motion of the second kind. The text then takes a look at the approximation meth

  12. Public relations and ethics

    Directory of Open Access Journals (Sweden)

    Bajić Milan

    2010-01-01

    Full Text Available The aim of this paper is the analysis of different forms of PR implementation and research its relation with ethics in practice. 'Public relations' is the every-day term that represents the job that is widely used in all aspects of life and work in today's society. Public relations represent a specific form of communication that has a particular application in society. Public relations involve focusing on a public aspect of organization with the aim of building a positive attitude and image. Image of public relations as a profession is often unfairly negative, and the reason for this is unprofessional and unethical relation of individuals towards their profession. In practice ethics in public relations is often considered to be an oxymoron. Ethical thinking of experts in public relations goes from Biblical attitude 'all you want people to do to you, do even so to them' (Matthew 7:12to professional loyalty to organization they work for. Because of unethical appearance it is important to set the rules, in the form of codex by which the public relations professionals will set their behaviors. .

  13. Gaining Relational Competitive Advantages

    DEFF Research Database (Denmark)

    Hu, Yimei; Zhang, Si; Li, Jizhen

    2015-01-01

    Establishing strategic technological partnerships (STPs) with foreign partners is an increasingly studied topic within the innovation management literature. Partnering firms can jointly create sources of relational competitive advantage. Chinese firms often lack research and development (R......&D) capabilities but are increasingly becoming preferred technological partners for transnational corporations. We investigate an STP between a Scandinavian and a Chinese firm and try to explore how to gain relational competitive advantage by focusing on its two essential stages: relational rent generation...... and appropriation. Based on an explorative case study, we develop a conceptual framework that consists of process, organizational alliance factors, and coordination modes that we propose lead to relational competitive advantage....

  14. Models as Relational Categories

    Science.gov (United States)

    Kokkonen, Tommi

    2017-11-01

    Model-based learning (MBL) has an established position within science education. It has been found to enhance conceptual understanding and provide a way for engaging students in authentic scientific activity. Despite ample research, few studies have examined the cognitive processes regarding learning scientific concepts within MBL. On the other hand, recent research within cognitive science has examined the learning of so-called relational categories. Relational categories are categories whose membership is determined on the basis of the common relational structure. In this theoretical paper, I argue that viewing models as relational categories provides a well-motivated cognitive basis for MBL. I discuss the different roles of models and modeling within MBL (using ready-made models, constructive modeling, and generative modeling) and discern the related cognitive aspects brought forward by the reinterpretation of models as relational categories. I will argue that relational knowledge is vital in learning novel models and in the transfer of learning. Moreover, relational knowledge underlies the coherent, hierarchical knowledge of experts. Lastly, I will examine how the format of external representations may affect the learning of models and the relevant relations. The nature of the learning mechanisms underlying students' mental representations of models is an interesting open question to be examined. Furthermore, the ways in which the expert-like knowledge develops and how to best support it is in need of more research. The discussion and conceptualization of models as relational categories allows discerning students' mental representations of models in terms of evolving relational structures in greater detail than previously done.

  15. Relational Perspectives on Leading

    DEFF Research Database (Denmark)

    Relational Perspectives on Leading discusses leadership from a relational and social constructionism perspective as practiced on an everyday basis between people. The book pursues a fast growing, practice-based approach - particularly within the Anglo-Saxon parts of the world - to organization...

  16. EU-Mashreq Relations

    DEFF Research Database (Denmark)

    Seeberg, Peter

    2018-01-01

    -related foreign policy considerations: the ENP Action Plans (APs) ‘will draw on a common set of principles but will be differentiated, reflecting the existing state of relations with each country, its needs and capacities, as well as common interests’ (Commission of the European Communities 2004). In the Mashreq...

  17. Annoying Danish Relatives

    DEFF Research Database (Denmark)

    Jensen de López, Kristine M.; Sundahl Olsen, Lone; Chondrigianni, V.

    2014-01-01

    This study examines the comprehension and production of subject and object relative clauses (SRCs, ORCs) by children with Specific Language Impairment (SLI) and their typically developing (TD) peers. The purpose is to investigate whether relative clauses are problematic for Danish children with S...... with the assignment of thematic roles rather than with the structural make-up of RCs....

  18. Destination: Alumni Relations

    Science.gov (United States)

    Scully, Maura King

    2010-01-01

    Increasingly today, with the growing and sophisticated skill set alumni professionals need to get the job done, alumni relations has become a destination career rather than a stop along the way. Modern alumni relations is "so much more than homecoming and punch-and-cookie receptions." It's marketing, volunteer management, and social networking. To…

  19. Heat-Related Illnesses

    Science.gov (United States)

    ... Share this! EmergencyCareForYou » Emergency 101 » Heat-Related Illnesses Heat-Related Illnesses Dr. Glenn Mitchell , Emergency physician at ... about heat cramps and heat stroke and exhaustion. Heat Cramps Symptoms include muscle spasms, usually in the ...

  20. Heat-Related Illnesses

    Medline Plus

    Full Text Available ... Share this! EmergencyCareForYou » Emergency 101 » Heat-Related Illnesses Heat-Related Illnesses Dr. Glenn Mitchell , Emergency physician at ... about heat cramps and heat stroke and exhaustion. Heat Cramps Symptoms include muscle spasms, usually in the ...

  1. Teaching Mediated Public Relations.

    Science.gov (United States)

    Kent, Michael L.

    2001-01-01

    Discusses approaches to teaching a mediated public relations course, emphasizing the World Wide Web. Outlines five course objectives, assignments and activities, evaluation, texts, and lecture topics. Argues that students mastering these course objectives will understand ethical issues relating to media use, using mediated technology in public…

  2. Measuring Relational Reasoning

    Science.gov (United States)

    Alexander, Patricia A.; Dumas, Denis; Grossnickle, Emily M.; List, Alexandra; Firetto, Carla M.

    2016-01-01

    Relational reasoning is the foundational cognitive ability to discern meaningful patterns within an informational stream, but its reliable and valid measurement remains problematic. In this investigation, the measurement of relational reasoning unfolded in three stages. Stage 1 entailed the establishment of a research-based conceptualization of…

  3. Relative Effects at Work

    NARCIS (Netherlands)

    Braeken, Johan; Mulder, Joris; Wood, Stephen

    2015-01-01

    Assessing the relative importance of predictors has been of historical importance in a variety of disciplines including management, medicine, economics, and psychology. When approaching hypotheses on the relative ordering of the magnitude of predicted effects (e.g., the effects of discrimination

  4. Methods of numerical relativity

    International Nuclear Information System (INIS)

    Piran, T.

    1983-01-01

    Numerical Relativity is an alternative to analytical methods for obtaining solutions for Einstein equations. Numerical methods are particularly useful for studying generation of gravitational radiation by potential strong sources. The author reviews the analytical background, the numerical analysis aspects and techniques and some of the difficulties involved in numerical relativity. (Auth.)

  5. Relational Processing Following Stroke

    Science.gov (United States)

    Andrews, Glenda; Halford, Graeme S.; Shum, David; Maujean, Annick; Chappell, Mark; Birney, Damian

    2013-01-01

    The research examined relational processing following stroke. Stroke patients (14 with frontal, 30 with non-frontal lesions) and 41 matched controls completed four relational processing tasks: sentence comprehension, Latin square matrix completion, modified Dimensional Change Card Sorting, and n-back. Each task included items at two or three…

  6. The Redshifts in Relativity

    Science.gov (United States)

    Singh, Satya Pal; Singh, Apoorva; Hareet, Prabhav

    2011-01-01

    The progress of modern cosmology took off in 1917 when A. Einstein published his paper on general theory of relativity extending his work of special theory of relativity (1905). In 1922 Alexander Friedmann constructed a mathematical model for expanding Universe that had a big bang in remote past. The experimental evidences could come in 1929 by…

  7. Forces in General Relativity

    Science.gov (United States)

    Ridgely, Charles T.

    2010-01-01

    Many textbooks dealing with general relativity do not demonstrate the derivation of forces in enough detail. The analyses presented herein demonstrate straightforward methods for computing forces by way of general relativity. Covariant divergence of the stress-energy-momentum tensor is used to derive a general expression of the force experienced…

  8. Antecedents of Relational Capital

    DEFF Research Database (Denmark)

    Nowinska, Agnieszka

    This paper merges economic geography and relational capital perspective in order to analyze the proximity-based antecedents of relational assets in brokerage. It investigates empirically the role and interplay of geographical and cognitive proximity between a broker and her buyers in a quantitative...... for buyers characteristics. Lastly, I make use the under-researched empirical field of brokers....

  9. Journalism of Relation

    DEFF Research Database (Denmark)

    Blaagaard, Bolette

    of cosmopolitanism from universal reproductions of sameness into creative productions of singular self-other relations based on the practiced and productive journalism. This is substantiated through case study analyses. The aim is to challenge the modern, rational journalistic subject referring back to the unified...... of the self-other relation which is simultaneously personal and political. Secondly, the dissertation relates the phenomenological ‘race’ and gender debates to the societal and productive context of contemporary European and ‘western’ globalised and mediated culture and politics. Journalism is re...... accountability and relation from journalistic training and practices whereby a ‘white’ and homogeneous social imaginary is reproduced. I make a call for thinking about journalism as relation – in terms of technological mediations, but also in terms of subjectivities. In order to allow for this, a shift is needed...

  10. Relative Lyapunov Center Bifurcations

    DEFF Research Database (Denmark)

    Wulff, Claudia; Schilder, Frank

    2014-01-01

    Relative equilibria (REs) and relative periodic orbits (RPOs) are ubiquitous in symmetric Hamiltonian systems and occur, for example, in celestial mechanics, molecular dynamics, and rigid body motion. REs are equilibria, and RPOs are periodic orbits of the symmetry reduced system. Relative Lyapunov...... center bifurcations are bifurcations of RPOs from REs corresponding to Lyapunov center bifurcations of the symmetry reduced dynamics. In this paper we first prove a relative Lyapunov center theorem by combining recent results on the persistence of RPOs in Hamiltonian systems with a symmetric Lyapunov...... center theorem of Montaldi, Roberts, and Stewart. We then develop numerical methods for the detection of relative Lyapunov center bifurcations along branches of RPOs and for their computation. We apply our methods to Lagrangian REs of the N-body problem....

  11. Estimativa por DSC das entalpias de sublimação da etilenouréia e da propilenouréia: algumas correlações empíricas envolvendo amidas e tioamidas Estimative by DSC data of the sublimation enthalpies for ethyleneurea and propyleneurea: some empirical correlations with amides and tioamides

    Directory of Open Access Journals (Sweden)

    Robson Fernandes de Farias

    1999-07-01

    Full Text Available By using DSC data, the enthaplies of sublimation for ethyleneurea and propyleneurea, are calculated as 84 and 89 kJ mol-1 respectively. Using the vaporization enthalpy values for dimethylethyleneurea and dimethylprophyleneurea, as obtained from literature, the empirical relation: Dcrg Hmo (1/ Dcrg Hmo (2 = Dlg Hmo (1/ Dlg Hmo(2 = constant, that relate sublimation or vaporization enthalpies of two different substances and of its methylated derivatives, is obtained. Correlations like that are found to another ureas and thioureas.

  12. Ether formulations of relativity

    International Nuclear Information System (INIS)

    Duffy, M.C.

    1980-01-01

    Contemporary ether theories are surveyed and criticised, especially those formally identical to orthodox Relativity. The historical development of Relativity, Special and General, in terms of an ether, is briefly indicated. Classical interpretations of Generalized Relativity using ether are compared to Euclidean formulations using a background space. The history of a sub-group of theories, formulating a 'new' Relativity involving modified transforms, is outlined. According to the theory with which they agree, recent supposed detections of drift are classified and criticised. Cosmological evidence suggesting an ether is mentioned. Only ether theories formally identical to Relativity have been published in depth. They stand criticised as being contrary to the positivist spirit. The history of mechanical analogues is traced, from Hartley's representing gravitating matter as spherical standing waves, to recent suggestions that vortex-sponge might model electromagnetic, quantum, uncertainty and faster-than-light phenomena. Contemporary theories are particular physical theories, themselves 'second interpretations' of a primary mathematical model. Mechanical analogues are auxiliary, not necessary, to other theory, disclosing relationships between classical and non-classical descriptions of assemblies charging state. The ether-relativity polemic, part of a broader dispute about relativity, is founded on mistaken conceptions of the roles of mathematical and physical models, mechanical analogues; and a distored view of history, which indicates that ether theories have become relativistic. (author)

  13. Modernization of credit relations

    Directory of Open Access Journals (Sweden)

    S.V. Volosovich

    2015-03-01

    Full Text Available Nowadays it is essential to modernize credit relations in the conditions of global economy transformations. This is due to the influence of integration processes on credit relations and transformation of the risks inherent in the credit field. The purpose of this article is to develop measures that help to improve the efficiency of interaction of credit relations’ participants. Modernization of credit relations is based on the interaction of its main and indirect subjects who belong to the subsystems of loans granting, deposits attraction and provision of related services. Its goal is to pass from extensive to intensive model of interaction between the subjects of credit relations. Components of the credit relations modernization are the following: institutional modernization, which is based on the interaction of credit relations’ subjects, and ensures the development of competition in all credit market’s segments, the creation of its corresponding infrastructure, qualitative change in the approaches of regulation and supervision; technological modernization, which involves the formation of joint products on the credit market and the formation of an integrated informational and analytical system. In the result of the credit relations’ modernization it is expected to achieve synergies between the subjects of credit relations, that will lead to changes in the business architecture of the financial market.

  14. The relational universe

    International Nuclear Information System (INIS)

    Magnon, A.

    1998-01-01

    A relational approach to be observable universe is proposed, which precludes the concept of absolute background. Space-time events emerge as dynamical entities which owe their existence to a memorization process, itself inter wind with the availability of cosmological horizons (screening from totality) sourcing long-range correlations. The resulting (and relational) mode of description sheds light on various paradoxes (EPR, Foucault pendolum, light beam effect, etc.), on the problem of instantaneous and global influences (quark deconfinement) as related to the interconnectedness of our cosmos. This scenario leads to comment on living systems vs. robots, and on non-recursive and global aspects of the mathematical intuition

  15. Special theory of relativity

    CERN Document Server

    Kilmister, Clive William

    1970-01-01

    Special Theory of Relativity provides a discussion of the special theory of relativity. Special relativity is not, like other scientific theories, a statement about the matter that forms the physical world, but has the form of a condition that the explicit physical theories must satisfy. It is thus a form of description, playing to some extent the role of the grammar of physics, prescribing which combinations of theoretical statements are admissible as descriptions of the physical world. Thus, to describe it, one needs also to describe those specific theories and to say how much they are limit

  16. Gravitation and relativity

    CERN Document Server

    Hoffmann, William F

    1964-01-01

    Remarks on the observational basis of general relativity ; Riemannian geometry ; gravitation as geometry ; gravitational waves ; Mach's principle and experiments on mass anisotropy ; the many faces of Mach ; the significance for the solar system of time-varying gravitation ; relativity principles and the role of coordinates in physics ; the superdense star and the critical nucleon number ; gravitation and light ; possible effects on the solar system of φ waves if they exist ; the Lyttleton-Bondi universe and charge equality ; quantization of general relativity ; Mach's principle as boundary condition for Einstein's equations.

  17. NgsRelate

    DEFF Research Database (Denmark)

    Korneliussen, Thorfinn Sand; Moltke, Ida

    2015-01-01

    . Using both simulated and real data, we show that NgsRelate provides markedly better estimates for low-depth NGS data than two state-of-the-art genotype-based methods. AVAILABILITY: NgsRelate is implemented in C++ and is available under the GNU license at www.pop gen.dk/software. CONTACT: ida...... be called with high certainty. RESULTS: We present a software tool, NgsRelate, for estimating pairwise relatedness from NGS data. It provides maximum likelihood estimates that are based on genotype likelihoods instead of genotypes and thereby takes the inherent uncertainty of the genotypes into account...

  18. Clocks and special relativity

    International Nuclear Information System (INIS)

    MacRoberts, D.T.

    1980-01-01

    A kinematic theory without precise definitions of the 'space' and 'time' used is an uninterpreted calculus. The definition of 'time' in special relativity is based on light propagation and the 'constant velocity of light' is a tautological consequence of the definition. When this definition is reified in a 'clock' the phenomenon of 'time dilation' occurs, in terms of the defined time, but is not reciprocal between moving systems; the postulate of relativity is not observed. The new definition of time is compatible with an ether theory without the relativity principle. The derivation of the Lorentz transformations, which requires both postulates, is purely formalistic and is not ontologically sound. (Auth.)

  19. Public Relations vs. Propaganda

    Directory of Open Access Journals (Sweden)

    Alexandru BASTIAN

    2006-10-01

    Full Text Available The paper aims at presenting the characteristics, methods and aplications of two related activities – Public Relations and propaganda. Although different from the piont of wiev of purpose and results (the practice of Public Relations aims at establishing and maintaining mutual lines of communications, understanding, acceptance, and cooperation between an organization and its publics, through transparency and honesty, while propaganda insists on a message that is intended primarily to serve the interests of the messenger. in order to influence public opinion and to manipulate other people’s beliefs by any means necessary, the two activities also present quite a lot of similarities.

  20. Simple relation algebras

    CERN Document Server

    Givant, Steven

    2017-01-01

    This monograph details several different methods for constructing simple relation algebras, many of which are new with this book. By drawing these seemingly different methods together, all are shown to be aspects of one general approach, for which several applications are given. These tools for constructing and analyzing relation algebras are of particular interest to mathematicians working in logic, algebraic logic, or universal algebra, but will also appeal to philosophers and theoretical computer scientists working in fields that use mathematics. The book is written with a broad audience in mind and features a careful, pedagogical approach; an appendix contains the requisite background material in relation algebras. Over 400 exercises provide ample opportunities to engage with the material, making this a monograph equally appropriate for use in a special topics course or for independent study. Readers interested in pursuing an extended background study of relation algebras will find a comprehensive treatme...

  1. General Relativity and Energy

    Science.gov (United States)

    Jackson, A. T.

    1973-01-01

    Reviews theoretical and experimental fundamentals of Einstein's theory of general relativity. Indicates that recent development of the theory of the continually expanding universe may lead to revision of the space-time continuum of the finite and unbounded universe. (CC)

  2. General relativity and experiment

    OpenAIRE

    Damour, T.

    1994-01-01

    The confrontation between Einstein's theory of gravitation and experiment is summarized. Although all current experimental data are compatible with general relativity, the importance of pursuing the quest for possible deviations from Einstein's theory is emphasized.

  3. Sport-related concussions

    Directory of Open Access Journals (Sweden)

    Jéssica Natuline Ianof

    Full Text Available ABSTRACT Traumatic brain injury (TBI is a major cause of lifelong disability and death worldwide. Sport-related traumatic brain injury is an important public health concern. The purpose of this review was to highlight the importance of sport-related concussions. Concussion refers to a transient alteration in consciousness induced by external biomechanical forces transmitted directly or indirectly to the brain. It is a common, although most likely underreported, condition. Contact sports such as American football, rugby, soccer, boxing, basketball and hockey are associated with a relatively high prevalence of concussion. Various factors may be associated with a greater risk of sport-related concussion, such as age, sex, sport played, level of sport played and equipment used. Physical complaints (headache, fatigue, dizziness, behavioral changes (depression, anxiety, irritability and cognitive impairment are very common after a concussion. The risk of premature return to activities includes the prolongation of post-concussive symptoms and increased risk of concussion recurrence.

  4. Relativity of Visual Communication

    Directory of Open Access Journals (Sweden)

    Arto Mutanen

    2016-03-01

    Full Text Available Communication is sharing and conveying information. In visual communication especially visual messages have to be formulated and interpreted. The interpretation is relative to a method of information presentation method which is human construction. This holds also in the case of visual languages. The notions of syntax and semantics for visual languages are not so well founded as they are for natural languages. Visual languages are both syntactically and semantically dense. The density is connected to the compositionality of the (pictorial languages. In the paper Charles Sanders Peirce’s theory of signs will be used in characterizing visual languages. This allows us to relate visual languages to natural languages. The foundation of information presentation methods for visual languages is the logic of perception, but only if perception is understood as propositional perception. This allows us to understand better the relativity of information presentation methods, and hence to evaluate the cultural relativity of visual communication.

  5. Heat-Related Illnesses

    Medline Plus

    Full Text Available ... Your Wishes Visiting The ER Who Takes Care Of You In An Emergency? Checking Into ... Illnesses Dr. Glenn Mitchell , Emergency physician at Mercy Health System in Chesterfield, Missouri Heat-related illness can be ...

  6. Heat-Related Illnesses

    Medline Plus

    Full Text Available ... Health System in Chesterfield, Missouri Heat-related illness can be caused by overexposure to the sun or ... the elderly are most at risk, but anyone can be affected. Here you will find information about ...

  7. Publicity and public relations

    Science.gov (United States)

    Fosha, Charles E.

    1990-01-01

    This paper addresses approaches to using publicity and public relations to meet the goals of the NASA Space Grant College. Methods universities and colleges can use to publicize space activities are presented.

  8. Heat-Related Illnesses

    Medline Plus

    Full Text Available ... ICE” in Your Cell Phone Prepare for Disasters Communication With Your Family And Your Doctor About Your ... Dr. Glenn Mitchell , Emergency physician at Mercy Health System in Chesterfield, Missouri Heat-related illness can be ...

  9. Relativity in modern physics

    CERN Document Server

    Deruelle, Nathalie

    2018-01-01

    This comprehensive textbook on relativity integrates Newtonian physics, special relativity and general relativity into a single book that emphasizes the deep underlying principles common to them all, yet explains how they are applied in different ways in these three contexts. Newton's ideas about how to represent space and time, his laws of dynamics, and his theory of gravitation established the conceptual foundation from which modern physics developed. Book I in this volume offers undergraduates a modern view of Newtonian theory, emphasizing those aspects needed for understanding quantum and relativistic contemporary physics. In 1905, Albert Einstein proposed a novel representation of space and time, special relativity. Book II presents relativistic dynamics in inertial and accelerated frames, as well as a detailed overview of Maxwell's theory of electromagnetism. This provides undergraduate and graduate students with the background necessary for studying particle and accelerator physics, astrophysics and ...

  10. Relating BIP and Reo

    NARCIS (Netherlands)

    K.P.C. Dokter (Kasper); S.-S.T.Q. Jongmans (Sung-Shik); F. Arbab (Farhad); S. Bliudze (Simon)

    2015-01-01

    textabstractCoordination languages simplify design and development of concurrent systems. Particularly, exogenous coordination languages, like BIP and Reo, enable system designers to express the interactions among components in a system explicitly. In this paper we establish a formal relation

  11. Relating BIP and Reo

    NARCIS (Netherlands)

    K.P.C. Dokter (Kasper); S.-S.T.Q. Jongmans (Sung-Shik); F. Arbab (Farhad); S. Bliudze (Simon); S. Knight; I. Lanese; A. Lluch Lafuente; H.T. Vieira

    2015-01-01

    htmlabstractCoordination languages simplify design and development of concurrent systems. Particularly, exogenous coordination languages, like BIP and Reo, enable system designers to express the interactions among components in a system explicitly. In this paper we establish a formal relation

  12. de Sitter special relativity

    International Nuclear Information System (INIS)

    Aldrovandi, R; Almeida, J P Beltran; Pereira, J G

    2007-01-01

    A special relativity based on the de Sitter group is introduced, which is a theory that might hold up in the presence of a non-vanishing cosmological constant. Like ordinary special relativity, it retains the quotient character of spacetime, and a notion of homogeneity. As a consequence, the underlying spacetime will be a de Sitter spacetime, whose associated kinematics will differ from that of ordinary special relativity. The corresponding modified notions of energy and momentum are obtained, and the exact relationship between them, which is invariant under a re-scaling of the involved quantities, explicitly exhibited. Since the de Sitter group can be considered a particular deformation of the Poincare group, this theory turns out to be a specific kind of deformed (or doubly) special relativity. Some experimental consequences, as well as the causal structure of spacetime-modified by the presence of the de Sitter horizon-are briefly discussed

  13. Asbestos-related malignancy

    International Nuclear Information System (INIS)

    Antmann, K.; Aisner, J.

    1986-01-01

    This book contains 20 chapters. Some of the chapter titles are: The Radiology of Asbestosis and Related Neoplasms; Computed Tomography and Malignant Mesothelioma; Radiation Therapy for Pleural Mesothelioma; and Radiation Therapy of Peritoneal Mesothelioma

  14. Managing or Relating?

    DEFF Research Database (Denmark)

    Sproedt, Henrik; Buur, Jacob

    2010-01-01

    This paper describes a case of user-driven innovation. We draw on social capital theory and the concept of complex responsive processes to examine the role of relations for the exchange and generation of knowledge across different knowledge traditions. We argue that innovation as a social phenome...... phenomenon with a high degree of uncertainty and complexity requires more relating and less managing to use conflict as a resource by turning the friction between different knowledge traditions into creative friction....

  15. Relativity theory - topical

    International Nuclear Information System (INIS)

    Schmutzer, E.

    1979-01-01

    Issued on the occasion of Albert Einstein's 100th birthday the book deals topically with the special and general relativity theory. The latest experiments to confirm the relativity theory are described and the historical development of the theory is presented in detail. Emphasis is given to the disclosure of deep insights into the nature of matter. Of interest to experts in physical and natural sciences and to mathematicians

  16. Mass relation for neutrinos

    Science.gov (United States)

    Babu; Barr

    2000-08-07

    A generalization of the well-known Georgi-Jarlskog relation (m(&mgr;)/m(tau)) = 3(m(s)/m(b)) to neutrinos is found in the context of SO(10). This new relation is (m(nu(&mgr;))/m(nu(tau))) = 16(m(c)/m(t)), which is consistent with present data, assuming the Mikheyev-Smirnov-Wolfenstein solution to the solar neutrino problem.

  17. Mass Relation for Neutrinos

    International Nuclear Information System (INIS)

    Babu, K. S.; Barr, S. M.

    2000-01-01

    A generalization of the well-known Georgi-Jarlskog relation (m μ /m τ ) =3(m s /m b ) to neutrinos is found in the context of SO(10) . This new relation is (m ν μ /m ν τ )=16(m c /m t ) , which is consistent with present data, assuming the Mikheyev-Smirnov-Wolfenstein solution to the solar neutrino problem. (c) 2000 The American Physical Society

  18. Classifying Linear Canonical Relations

    OpenAIRE

    Lorand, Jonathan

    2015-01-01

    In this Master's thesis, we consider the problem of classifying, up to conjugation by linear symplectomorphisms, linear canonical relations (lagrangian correspondences) from a finite-dimensional symplectic vector space to itself. We give an elementary introduction to the theory of linear canonical relations and present partial results toward the classification problem. This exposition should be accessible to undergraduate students with a basic familiarity with linear algebra.

  19. The metamorphoses of relativity

    Science.gov (United States)

    Staley, Richard

    This talk will explore the ways that problems shifted and disciplinary boundaries changed around physicists' engagement with relational physics and relativistic thought, first in research dealing with physiology, psychology and geometry in the late nineteenth century and then (a better-known story) moving between physics, mathematics and geometry in the twentieth century. I hope to develop a richer approach for understanding the disciplinary and political significance of relativity, especially by considering in one framework the work of Engels, Mach, Einstein and Planck.

  20. General Relativity and Gravitation

    Science.gov (United States)

    Ehlers, J.; Murdin, P.

    2000-11-01

    The General Theory of Relativity (GR), created by Albert Einstein between 1907 and 1915, is a theory both of gravitation and of spacetime structure. It is based on the assumption that matter, via its energy-momentum, interacts with the metric of spacetime, which is considered (in contrast to Newtonian physics and SPECIAL RELATIVITY) as a dynamical field having degrees of freedom of its own (GRAVI...

  1. INTERPERSONAL RELATIONS IN SCHOOL

    Directory of Open Access Journals (Sweden)

    Siniša Opić

    2016-12-01

    Full Text Available As part of the scientific project titled “The Curriculum of Social Competences and Relations in School”, the aim of this paper is to examine the quality of interpersonal relations between teachers and pupils. On a sample of 432 teachers from 20 towns, 35 primary schools in the Republic of Croatia, and 432 pupils, it was confirmed that there is a difference in the appraisal of the quality of their interpersonal relations. Although the overall quality of interpersonal relations between pupils and teachers is at a moderately satisfactory level, pupils still appraise the quality of interpersonal relations lower than their teachers. In view of latent dimensionality, a factor questionnaire structure was used (14 variables; ordinal type and two main components (subscales determined: didactic support and interaction, and rough verbal and physical treatment. As part of the differential draft of our research, no gender differences were established (between female and male teachers in the appraisal of the quality of interpersonal relations with pupils (on two subscales. The correlation analysis confirmed a low negative statistically significant correlation between the years of service and the subscale rough verbal and physical treatment (Rho=-0.101. In view of the subscale of rough verbal and physical treatment between pupils and teachers, such results on a negative correlation imply that older teachers, as opposed to their younger colleagues, use more corporal punishment in schools, treat pupils rudely, use nasty and impolite words, and call pupils insulting names.

  2. The theories of relativity

    International Nuclear Information System (INIS)

    Deruelle, N.; Uzan, J.P.

    2014-01-01

    This book is a quite complete route towards general relativity via special relativity with a start point at Newton's mechanics. The mathematical formulation is based on tensors. All the relativistic aspects of only classical physics - it means no quantum mechanics - are exposed. This book is divided into 3 books and each book represents a consistent knowledge of physics at a certain time in the past: in Newton's time, in the second half of the 19. century and today. The advantage of this presentation is to make the reader feels the changes over time in the concepts of time, space, gravity, cosmology. Each book is divided into 3, 4 and 5 parts which are sub-divided into numerous chapters. Book 1: Space, time and gravity in Newton's theory, with part 1: kinematics, part 2: dynamics and part 3: gravity. Book 2: Special relativity and Maxwell's theory, with part 1: kinematics, part 2: dynamics, part 3: electromagnetism and part 4: electrodynamics. And Book 3: General relativity and gravity, with part 1: curved space-time and gravity, part 2: Schwarzschild solution and black holes, part 3: general relativity and experiments, part 4: Friedman-Lemaitre solutions and cosmology, and part 5: elements or Riemann geometry. The 3. book dedicated to general relativity, tackles topics like the relationships between space-time curvature and gravity, Schwarzschild solutions and black holes, gravitational waves, Friedmann-Lemaitre solutions and cosmology, and Riemann geometry. (A.C.)

  3. STRATEGI KOMUNIKASI PUBLIC RELATIONS

    Directory of Open Access Journals (Sweden)

    Artis Artis

    2011-11-01

    Full Text Available Living man in interrelates society. Relationship among human being done by gets communication so man one by another one mutually understand and influence regard for the benefit, it that always been practiced by Public Relations( liaison in a governance and also firm institute to reach to the effect which ices. The institute of Public Relations declares for,”Public Relations is overall effort which be passed off by design and berkesenambungan in order to creates and pet keenness and mutual understanding among an organization with whole its member “. In this case, Public Relations in give distribution on manajement's strategy there is two: First, Doing task as part of Public Relations's strategy and involvement in comprehensive process and gives benefit for management an organization. Both of, Public Relations gets role in management strategy in bring off activity to reach to the effect good one gets internal character and also external one correspond to that desirable by good institute on level governance and firm.

  4. De Sitter projective relativity

    CERN Document Server

    Licata, Ignazio; Benedetto, Elmo

    2017-01-01

    This book presents the Projective approach to de Sitter Relativity. It traces the development of renewed interest in models of the universe at constant positive curvature such as "vacuum" geometry. The De Sitter Theory of Relativity, formulated in 1917 with Willem De Sitter's solution of the Einstein equations, was used in different fields during the 1950s and 1960s, in the work of H. Bacry, J.M. LevyLeblond and F.Gursey, to name some important contributors. From the 1960s to 1980s, L. Fantappié and G. Arcidiacono provided an elegant group approach to the De Sitter universe putting the basis for special and general projective relativity. Today such suggestions flow into a unitary scenario, and this way the De Sitter Relativity is no more a "missing opportunity" (F. Dyson, 1972), but has a central role in theoretical physics. In this volume a systematic presentation is given of the De Sitter Projective relativity, with the recent developments in projective general relativity and quantum cosmology.

  5. Algorithmic Relative Complexity

    Directory of Open Access Journals (Sweden)

    Daniele Cerra

    2011-04-01

    Full Text Available Information content and compression are tightly related concepts that can be addressed through both classical and algorithmic information theories, on the basis of Shannon entropy and Kolmogorov complexity, respectively. The definition of several entities in Kolmogorov’s framework relies upon ideas from classical information theory, and these two approaches share many common traits. In this work, we expand the relations between these two frameworks by introducing algorithmic cross-complexity and relative complexity, counterparts of the cross-entropy and relative entropy (or Kullback-Leibler divergence found in Shannon’s framework. We define the cross-complexity of an object x with respect to another object y as the amount of computational resources needed to specify x in terms of y, and the complexity of x related to y as the compression power which is lost when adopting such a description for x, compared to the shortest representation of x. Properties of analogous quantities in classical information theory hold for these new concepts. As these notions are incomputable, a suitable approximation based upon data compression is derived to enable the application to real data, yielding a divergence measure applicable to any pair of strings. Example applications are outlined, involving authorship attribution and satellite image classification, as well as a comparison to similar established techniques.

  6. Dynamics and Relativity

    CERN Document Server

    Forshaw, Jeffrey

    2009-01-01

    A new title in the Manchester Physics Series, this introductory text emphasises physical principles behind classical mechanics and relativity. It assumes little in the way of prior knowledge, introducing relevant mathematics and carefully developing it within a physics context. Designed to provide a logical development of the subject, the book is divided into four sections, introductory material on dynamics, and special relativity, which is then followed by more advanced coverage of dynamics and special relativity. Each chapter includes problems ranging in difficulty from simple to challenging with?solutions for solving problems. Includes?solutions for solving problemsNumerous worked examples included throughout the bookMathematics is carefully explained and developed within a physics environmentSensitive to topics that can appear daunting or confusing

  7. New general relativity

    International Nuclear Information System (INIS)

    Hayashi, K.; Shirafuji, T.

    1979-01-01

    A gravitational theory is formulated on the Weitzenboeck space-time, characterized by the vanishing curvature tensor (absolute parallelism) and by the torsion tensor formed of four parallel vector fields. This theory is called new general relativity, since Einstein in 1928 first gave its original form. New general relativity has three parameters c 1 , c 2 , and lambda, besides the Einstein constant kappa. In this paper we choose c 1 = 0 = c 2 , leaving open lambda. We prove, among other things, that (i) a static, spherically symmetric gravitational field is given by the Schwarzschild metric, that (ii) in the weak-field approximation an antisymmetric field of zero mass and zero spin exists, besides gravitons, and that (iii) new general relativity agrees with all the experiments so far carried out

  8. Global general relativity

    International Nuclear Information System (INIS)

    Penrose, R.

    1979-01-01

    Much theoretical work in General Relativity has been concerned with finding explicit solutions of Einstein field equations. Exact solutions must involve simplifying procedures which in the case of strong gravitational fields may not be valid. Computers can help but complementary to these are the global qualitative mathematics that have been introduced into relativity over the past years. These have shown that Einstein's equations together with suitable inequalities on the energy-momentum tensor can lead inevitably to space-time singularities arising, provided that some qualitative geometric criterion is satisfied. It seems that in suitable situations of gravitational collapse this criterion will be satisfied. Similarly in a cosmological setting the criterion can be applied in the reverse direction in time. There is, however, the unsolved problem in general relativity of cosmic censorship and this is discussed as a consequence of Einstein's equations. (UK)

  9. Elementary general relativity

    International Nuclear Information System (INIS)

    Clarke, C.

    1979-01-01

    The plan of the book is as follows: Chapter 1 develops special relativity in a setting and notation that can immediately be transferred to general relativity. Most of the fundamental geometrical ideas are established here. Chapter 2 gives a more conventional account of some selected applications of special relativity. Chapter 3 is the heart of the book. A geometrical model of space-time is progressively built up, motivated by physical arguments stemming from the equivalence principle, leading to Einstein's field equations. Chapter 4 deals very quickly with the simplest form of weak-field theory with application to gravitational radiation. Chapter 5 concludes the book with a fairly detailed analysis of the Schwarzschild solution, plane fronted gravitational waves, and the Robertson-Walker cosmological solutions. Exercises at the end of each chapter extend the general theory into particular applications, giving a broader picture of the scope of the subject. (author)

  10. Tensors, relativity, and cosmology

    CERN Document Server

    Dalarsson, Mirjana

    2015-01-01

    Tensors, Relativity, and Cosmology, Second Edition, combines relativity, astrophysics, and cosmology in a single volume, providing a simplified introduction to each subject that is followed by detailed mathematical derivations. The book includes a section on general relativity that gives the case for a curved space-time, presents the mathematical background (tensor calculus, Riemannian geometry), discusses the Einstein equation and its solutions (including black holes and Penrose processes), and considers the energy-momentum tensor for various solutions. In addition, a section on relativistic astrophysics discusses stellar contraction and collapse, neutron stars and their equations of state, black holes, and accretion onto collapsed objects, with a final section on cosmology discussing cosmological models, observational tests, and scenarios for the early universe. This fully revised and updated second edition includes new material on relativistic effects, such as the behavior of clocks and measuring rods in m...

  11. Introduction to special relativity

    International Nuclear Information System (INIS)

    Rindler, W.

    1982-01-01

    This is intended as a text for an introductory course on special relativity; it assumes no prior knowledge of relativity. It is intended for the upper undergraduate level and upwards. The first three chapters take a three-dimensional viewpoint for a simple introduction to topics such as the relativity of simultaneity, length contraction, time dilation, the twin paradox and the appearance of moving objects. For the remaining chapters the strongest possible use is made of four-dimensional techniques. Chapter four deals with space-time, chapters five and six with mechanics and electromagnetism. In these a purely synthetic four-tensor approach is adopted. Pure tensor theory is covered in an appendix. The last chapter is on the mechanics of continua. (U.K.)

  12. Essential dynamics and relativity

    CERN Document Server

    O'Donnell, Peter J

    2014-01-01

    Essential Dynamics & Relativity provides students with an introduction to the core aspects of dynamics and special relativity. The author reiterates important ideas and terms throughout and covers concepts that are often missing from other textbooks at this level. He also places each topic within the wider constructs of the theory, without jumping from topic to topic to illustrate a point.The first section of the book focuses on dynamics, discussing the basic aspects of single particle motion and analyzing the motion of multi-particle systems. The book also explains the dynamical behavior of b

  13. Relativity and its roots

    CERN Document Server

    Hoffmann, Banesh

    1998-01-01

    In this fascinating, accessible introduction to one of the most revolutionary developments in modern physics, Einstein scholar Banesh Hoffmann recounts the successive insights that led to both the special and general theories of relativity.Using simple examples from everyday life, the author presents entertaining, nontechnical demonstrations of what relativity actually means and how it has revolutionized our ideas of time and space. Starting with the geometrical and cosmological ideas of the ancient Greeks, the author traces the succession of ideas and advances that paved the way for modern p

  14. Structural Logical Relations

    DEFF Research Database (Denmark)

    Schürmann, Carsten; Sarnat, Jeffrey

    2008-01-01

    Tait's method (a.k.a. proof by logical relations) is a powerful proof technique frequently used for showing foundational properties of languages based on typed lambda-calculi. Historically, these proofs have been extremely difficult to formalize in proof assistants with weak meta-logics......, such as Twelf, and yet they are often straightforward in proof assistants with stronger meta-logics. In this paper, we propose structural logical relations as a technique for conducting these proofs in systems with limited meta-logical strength by explicitly representing and reasoning about an auxiliary logic...

  15. Turbine related fish mortality

    International Nuclear Information System (INIS)

    Eicher, G.J.

    1993-01-01

    A literature review was conducted to assess the factors affecting turbine-related fish mortality. The mechanics of fish passage through a turbine is outlined, and various turbine related stresses are described, including pressure and shear effects, hydraulic head, turbine efficiency, and tailwater level. The methodologies used in determining the effects of fish passage are evaluated. The necessity of adequate controls in each test is noted. It is concluded that mortality is the result of several factors such as hardiness of study fish, fish size, concentrations of dissolved gases, and amounts of cavitation. Comparisons between Francis and Kaplan turbines indicate little difference in percent mortality. 27 refs., 5 figs

  16. Rotating Stars in Relativity

    Directory of Open Access Journals (Sweden)

    Stergioulas Nikolaos

    2003-01-01

    Full Text Available Rotating relativistic stars have been studied extensively in recent years, both theoretically and observationally, because of the information they might yield about the equation of state of matter at extremely high densities and because they are considered to be promising sources of gravitational waves. The latest theoretical understanding of rotating stars in relativity is reviewed in this updated article. The sections on the equilibrium properties and on the nonaxisymmetric instabilities in f-modes and r-modes have been updated and several new sections have been added on analytic solutions for the exterior spacetime, rotating stars in LMXBs, rotating strange stars, and on rotating stars in numerical relativity.

  17. Bourdieu in International Relations

    DEFF Research Database (Denmark)

    The last few years have seen a genuine wave of publications promoting sociology in international relations. Scholars have suggested that Bourdieu’s vocabulary can be applied to study security, diplomacy, migration and global environmental politics. Yet we still lack a systematic and accessible....... The chapters demonstrate how these concepts can be reinterpreted and used in new ways when exposed to Bourdieusian logic. Challenging key pillars of IR scholarship, Bourdieu in International Relations will be of interest to critical theorists, and scholars of IR theory....

  18. Relatório e Projeto na Licenciatura: a Escrita como Potencialização da Experiência

    Directory of Open Access Journals (Sweden)

    Neide Luzia de Rezende

    2010-09-01

    Full Text Available Este artigo busca discutir aspectos relacionados a atividades de escrita do curso de Licenciatura, especificamente da disciplina de Metodologia do Ensino de Língua Portuguesa (MELP, na Faculdade de Educação da USP. Procura distinguir peculiaridades dos textos solicitados aos alunos no curso de Letras e no curso de Licenciatura. Neste ƒúltimo, sobretudo quando são textos decorrentes de atividades de estágio e de projeção da prática escolar do futuro professor de português. Os Relatórios de Estágio, os Diários de Campo e os Projetos para a Sala de Aula são abordados na disciplina de MELP a partir de suas características discursivas, tendo em vista a dupla dimensão que apresentam: a de prática social e de prática escolar. Assim, o modo de ser desses gêneros é‡repensado àˆluz das necessidades de aprendizagem de texto e de escrita, numa perspectiva metalinguística inerente aos textos acadêmicos – especialmente no curso de Letras, que forma especialistas em Língua Portuguesa –, mas são também, na Licenciatura, instrumentos da formação do profissional, no caso, formação do futuro professor de Português. Desse modo, o conhecimento acumulado ‡ confrontado com a vivência empírica, com uma situação específica observada e/ou vivenciada na escola, ou ainda com uma projeção dessa experiência mediante a escrita.

  19. Nuclear energy related research

    International Nuclear Information System (INIS)

    Toerroenen, K.; Kilpi, K.

    1985-01-01

    This research programme plan for 1985 covers the nuclear energy related research planned to be carried out at the Technical Research Centre of Finland (VTT) and funded by the Ministry of Trade and Industry in Finland, the Nordic Council of Ministers and VTT

  20. Goedel, relativity, and mind

    International Nuclear Information System (INIS)

    Penrose, Roger

    2007-01-01

    Goedel's acquaintance with Einstein led him to discover, by use of novel techniques, an exotic cosmological model which flouted many preconceived notions, such as the role of Mach's principle in general relativity and the nature of time. Goedel also invoked it in speculations concerning the question of minds

  1. MARC and Relational Databases.

    Science.gov (United States)

    Llorens, Jose; Trenor, Asuncion

    1993-01-01

    Discusses the use of MARC format in relational databases and addresses problems of incompatibilities. A solution is presented that is in accordance with Open Systems Interconnection (OSI) standards and is based on experiences at the library of the Universidad Politecnica de Valencia (Spain). (four references) (EA)

  2. Quantum relativity theory

    International Nuclear Information System (INIS)

    Banai, M.

    1983-11-01

    A quantum relativity theory formulated in terms of Davis' quantum relativity principle is outlined. The first task in this theory as in classical relativity theory is to model space-time, the arena of natural processes. It is argued that the quantum space-time models of Banai introduced in an earlier paper is formulated in terms of Davis' quantum relativity. Then it is shown that the recently proposed classical relativistic quantum theory of Prugovecki and his corresponding classical relativistic quantum model of space-time open the way to introduce in a consistent way the quantum space-time model (the 'canonically quantized Minkowski space') proposed by Banai earlier. The main new aspect of the quantum mechanics of the quantum relativistic particles is, in this model of space-time, that it provides a true mass eigenvalue problem and, that the excited mass states of such particles can be interpreted as classifically relativistic (massive) quantum particles ('elementary particles'). The question of field theory over quantum relativistic models of space-time is also discussed. Finally, it is suggested that 'quarks' should be considered as quantum relativistic particles. (author)

  3. Related Addictive Disorders.

    Science.gov (United States)

    Buck, Tina; Sales, Amos

    This paper provides an overview of addiction related to substance abuse. It provides basic information, prevalence, diagnostic criteria, assessment tools, and treatment issues for eating disorders, compulsive gambling, sex addictions, and work addictions. Eating disorders such as anorexia nervosa and bulimia nervosa, especially affect adolescents.…

  4. Bimetric general relativity

    International Nuclear Information System (INIS)

    Rosen, N.

    1979-01-01

    A modification of general relativity is proposed involving a second metric tensor describing a space-time of constant curvature and associated with the fundamental rest-frame of the universe. The theory generally agrees with the Einstein theory, but gives cosmological models without singularities which can account for present observation, including helium abundance

  5. Related Drupal Nodes Block

    NARCIS (Netherlands)

    Van der Vegt, Wim

    2010-01-01

    Related Drupal Nodes Block This module exposes a block that uses Latent Semantic Analysis (Lsa) internally to suggest three nodes that are relevant to the node a user is viewing. This module performs three tasks. 1) It periodically indexes a Drupal site and generates a Lsa Term Document Matrix.

  6. Nuclear energy related research

    International Nuclear Information System (INIS)

    Salminen, Pertti

    1989-03-01

    This annual Research Programme Plan covers the publicly funded nuclear energy related research planned to be carried out at the Technical Research Centre of Finland (VTT) in 1989. The research will be financed by the Ministry of Trade and Industry, the Finnish Centre for Radiation and Nuclear Safety, the Nordic Council of Ministers and VTT itself

  7. Relational Aggression among Students

    Science.gov (United States)

    Young, Ellie L.; Nelson, David A.; Hottle, America B.; Warburton, Brittney; Young, Bryan K.

    2011-01-01

    "Relational aggression" refers to harm within relationships caused by covert bullying or manipulative behavior. Examples include isolating a youth from his or her group of friends (social exclusion), threatening to stop talking to a friend (the silent treatment), or spreading gossip and rumors by email. This type of bullying tends to be…

  8. Aquinas on Real Relation

    Czech Academy of Sciences Publication Activity Database

    Svoboda, David

    2016-01-01

    Roč. 6, č. 1 (2016), s. 147-172 ISSN 1804-5588 Institutional support: RVO:67985955 Keywords : relation and its foundation * Aquinas * order Subject RIV: AA - Philosophy ; Religion http://www.cupress.cuni.cz/ink2_stat/index.jsp?include=AUC_clanek&id=2868&id=5343&casopis=921&zalozka=0&predkl=0

  9. Nuclear energy related research

    International Nuclear Information System (INIS)

    Salminen, P.; Mattila, L.

    1990-08-01

    The annual Research Programme Plan describes the publicly funded nuclear energy related research to be carried out at the Technical Research Centre of Finland (VTT) in 1990. The research is financed primarily by the Ministry of Trade and Industry (KTM), the Finnish Centre for Radiation and Nuclear Safety (STUK) and VTT itself. Utilities and industry also contribute to some projects

  10. Conformal special relativity

    International Nuclear Information System (INIS)

    Maia, M.D.

    2006-01-01

    It is shown that the information loss/recovery theorem based on the ADS/CFT correspondence is not consistent with the stability of the Schwarzschild or Reissner-Nordstrom black holes. Nonetheless, the conformal invariance of Yang-Mills theory points to new relativity principle compatible with quantum unitarity near those black holes

  11. Is Happinness relative?

    NARCIS (Netherlands)

    R. Veenhoven (Ruut)

    1991-01-01

    textabstractABSTRACT The theory that happiness is relative is based on three postulates: (1) happiness results from comparison. (2) standards of comparison adjust, (3) standards of comparison are arbitrary constructs. On the basis of these postulates the theory predicts: (a) happiness does not

  12. Nuclear energy related research

    International Nuclear Information System (INIS)

    Mattila, L.; Vanttola, T.

    1991-10-01

    The annual Research Programme Plan describes the publicly funded nuclear energy related research to be carried out mainly at the Technical Research Centre of Finland (VTT) in 1991. The research is financed primarily by the Ministry of Trade and Industry (KTM), the Finnish Centre for Radiation and Nuclear Safety (STUK) and VTT itself. Other research institutes, utilities and industry also contribute to many projects

  13. The relations of particles

    International Nuclear Information System (INIS)

    Okun, L.B.

    1991-01-01

    This book presents papers on elementary particle physics, relations between various particles, and the connections between particle physics with other branches of physics. The papers include: Contemporary status and prospects of high-energy physics; Particle physics prospects; and High energy physics

  14. Can Relations be Designed?

    DEFF Research Database (Denmark)

    Skou, Niels Peter; Mikkelsen, Mette

    2014-01-01

    This paper examines the role of design methods in a social innovation project on a Danish Institution for severely physically and mentally handicapped people. The project was focused on ‘designing’ new or better relations between the residents at the institution and the civil society. During the ...

  15. Employment Relations in Denmark

    DEFF Research Database (Denmark)

    Madsen, Jørgen Steen; Due, Jesper Jørgen; Andersen, Søren Kaj

    2011-01-01

    Jørgen Steen Madsen, Jesper Due og Søren Kaj Andersen har skrevet et kapitel om udviklingen i dansk arbejdsmarkedsregulering til bogen International and Comparative Employment Relations, redigeret af Greg Bamber, Russell Lansbury og Nick Wailes. Bogen indeholder bidrag, der præsenterer og...

  16. BNFL and community relations

    International Nuclear Information System (INIS)

    Bolter, H.

    1982-01-01

    The contributions made by BNFL to community relations are described in an illustrated booklet under the headings: introduction (general policy); donations and sponsorships; BNFL talks service; brochures and public information; visits; local liaison committees; industrial training; sponsored students; apprentices. (U.K.)

  17. Nuclear energy related research

    International Nuclear Information System (INIS)

    Rintamaa, R.

    1992-05-01

    The annual Research Programme Plan describes publicly funded nuclear energy related research to be carried out mainly at the Technical Research Centre of Finland (VTT) in 1992. The research is financed primarily by the Ministry of Trade and Industry (KTM), the Finnish Centre for Radiation and Nuclear Safety (STUK) and VTT itself. Other research institutes, utilities and industry also contribute to many projects

  18. Relational Demonic Fuzzy Refinement

    Directory of Open Access Journals (Sweden)

    Fairouz Tchier

    2014-01-01

    Full Text Available We use relational algebra to define a refinement fuzzy order called demonic fuzzy refinement and also the associated fuzzy operators which are fuzzy demonic join (⊔fuz, fuzzy demonic meet (⊓fuz, and fuzzy demonic composition (□fuz. Our definitions and properties are illustrated by some examples using mathematica software (fuzzy logic.

  19. relation in spherical systems

    Indian Academy of Sciences (India)

    D. Bhattacharyya

    2018-02-09

    Feb 9, 2018 ... SMBH than that of the nearby stars. The relation of the. SMBHs to their host galaxies can be seen by the strong correlation between the mass of SMBH and velocity dispersion σ of the stars in the galaxy. This is some- what surprising because the stars are too far from the. SMBH for the velocity dispersion to ...

  20. Decreasing relative risk premium

    DEFF Research Database (Denmark)

    Hansen, Frank

    2007-01-01

    such that the corresponding relative risk premium is a decreasing function of present wealth, and we determine the set of associated utility functions. We find a new characterization of risk vulnerability and determine a large set of utility functions, closed under summation and composition, which are both risk vulnerable...