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Sample records for monk model perfectly

  1. Monks' Health: Holistic Health Care Model by Community Participation

    Directory of Open Access Journals (Sweden)

    Decha Buates

    2010-01-01

    Full Text Available Problem statement: Monks’ health tended to be a continuous increased problem. They were groups who had limitations to access health services due to their monastic disciplines and their most importance for Buddhist institution. Without urgent solution, their normal way of life would have been affected. Approach: This research aimed to study current conditions and to develop monks’ holistic health care models by community participation in central region of Thailand. The study was a qualitative research conducted in 9 temples; 3 temples in urban area, 3 in semi-urban area and 3 in rural area. Samples were 224 persons; consisted of monks, public health officers from Department of Religious Affairs, local administrative organizations and people; selected by purposive sampling method. Observation form, survey form, interview form, focus group discussion and workshop were used as research tools while data was analyzed by descriptive research. Results: The result founded that in former time culture of monks’ health care was leaned on community, social, culture and tradition. People spoke in style of central Thai language and were in agricultural sector as well as had their belief in merit, sin and elder respect. Relation in communities was in form of generosity and living as similar as relatives. When some monk got sick, they would visit, take care and give foods and medicines. Most of medicines were household remedy and Thai herbal medicine that bought from drug stores in local market or grocery stores in village and monks were sent to hospital in case of severe illness. Temple was a part of community, so they had close relation. Nowadays people increasingly worked in manufactories that caused conflicts and alienations among them. Monks leaned on local markets for receiving foods offering and most of foods were cooked from flour, sugar, coconut milk and fat. These caused three-fourth of monks having chronic disease as diabetes

  2. Thick brane world model from perfect fluid

    CERN Document Server

    Ivashchuk, V D

    2001-01-01

    A (1 + d)-dimensional thick "brane world" model with varying Lambda-term is considered. The model is generalized to the case of a chain of Ricci-flat internal spaces when the matter source is an anisotropic perfect fluid. The "horizontal" part of potential is obtained in the Newtonian approximation. In the multitemporal case (with a Lambda-term) a set of equations for potentials is presented.

  3. Legacy HMSRP Hawaiian Monk Seals Observers

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set documents observers that have collected monk seal data as part of the ongoing monk seal population assessment efforts by PSD personnel and cooperating...

  4. Inhomogeneous generalizations of Bianchi type VIh models with perfect fluid

    Science.gov (United States)

    Roy, S. R.; Prasad, A.

    1991-07-01

    Inhomogeneous universes admitting an Abelian G2 of isometry and filled with perfect fluid have been derived. These contain as special cases exact homogeneous universes of Bianchi type VIh. Many of these universes asymptotically tend to homogeneous Bianchi VIh universes. The models have been discussed for their physical and kinematical behaviors.

  5. Mathematical model for coupling a quasi-unidimensional perfect flow

    CERN Document Server

    Msallam, Régis

    2010-01-01

    Nonlinear acoustics of wind instruments conducts to study unidimensional fluid flows. From physically relevant approximations that are modelized with the thin layer Navier Stokes equations, we propose a coupled model where perfect fluid flow is described by the Euler equations of gas dynamics and viscous and thermal boundary layer is modelized by a linear equation. We describe numerical discretization, validate the associated software by comparison with analytical solutions and consider musical application of strongly nonlinear waves in the trombone.

  6. Spherically symmetric Einstein-aether perfect fluid models

    CERN Document Server

    Coley, Alan A; Sandin, Patrik; Latta, Joey

    2015-01-01

    We investigate spherically symmetric cosmological models in Einstein-aether theory with a tilted (non-comoving) perfect fluid source. We use a 1+3 frame formalism and adopt the comoving aether gauge to derive the evolution equations, which form a well-posed system of first order partial differential equations in two variables. We then introduce normalized variables. The formalism is particularly well-suited for numerical computations and the study of the qualitative properties of the models, which are also solutions of Horava gravity. We study the local stability of the equilibrium points of the resulting dynamical system corresponding to physically realistic inhomogeneous cosmological models and astrophysical objects with values for the parameters which are consistent with current constraints. In particular, we consider dust models in ($\\beta-$) normalized variables and derive a reduced (closed) evolution system and we obtain the general evolution equations for the spatially homogeneous Kantowski-Sachs model...

  7. Simulation of MILD combustion using Perfectly Stirred Reactor model

    KAUST Repository

    Chen, Z.

    2016-07-06

    A simple model based on a Perfectly Stirred Reactor (PSR) is proposed for moderate or intense low-oxygen dilution (MILD) combustion. The PSR calculation is performed covering the entire flammability range and the tabulated chemistry approach is used with a presumed joint probability density function (PDF). The jet, in hot and diluted coflow experimental set-up under MILD conditions, is simulated using this reactor model for two oxygen dilution levels. The computed results for mean temperature, major and minor species mass fractions are compared with the experimental data and simulation results obtained recently using a multi-environment transported PDF approach. Overall, a good agreement is observed at three different axial locations for these comparisons despite the over-predicted peak value of CO formation. This suggests that MILD combustion can be effectively modelled by the proposed PSR model with lower computational cost.

  8. LATTICE-BOLTZMANN MODEL FOR COMPRESSIBLE PERFECT GASES

    Institute of Scientific and Technical Information of China (English)

    Sun Chenghai

    2000-01-01

    We present an adaptive lattice Boltzmann model to simulate super sonic flows. The particle velocities are determined by the mean velocity and internal energy. The adaptive nature of particle velocities permits the mean flow to have high Mach number. A particle potential energy is introduced so that the model is suitable for the perfect gas with arbitrary specific heat ratio. The Navier-Stokes equations are derived by the Chapman-Enskog method from the BGK Boltzmann equation.As preliminary tests, two kinds of simulations have been performed on hexagonal lattices. One is the one-dimensional simulation for sinusoidal velocity distributions.The velocity distributions are compared with the analytical solution and the mea sured viscosity is compared with the theoretical values. The agreements are basically good. However, the discretion error may cause some non-isotropic effects. The other simulation is the 29 degree shock reflection.

  9. Vertimill™ pilot scale tests simulated by perfect mixing model

    Directory of Open Access Journals (Sweden)

    Douglas Batista Mazzinghy

    2014-07-01

    Full Text Available Minas-Rio Project, Anglo American property, located in Brazil, considers Vertimill™ to make the particle size distribution adequate to feed slurry pipeline. A pilot test campaign was carried out at Metso's pilot plant facility located in York city, Pennsylvania State, USA, to provide information to scale up the industrial grinding circuit. The perfect mixing model, normally used to simulate ball mills, was used to compare the direct and reverse circuit configurations. The simulations were based on the appearance function determined from the laboratory tests using a batch tube mill. The combined breakage rate/discharge rate function (r/d was determined from Vertimill™ feed and product particle size distributions obtained from pilot tests. The residence time was estimated considering the mill hold-up and solids flow rate. The simulation results show that there are no significant differences between direct and reverse circuits for the sample tested.

  10. Smoking prevalence among monks in Thailand.

    Science.gov (United States)

    Kungskulniti, Nipapun; Charoenca, Naowarut; Kengganpanich, Tharadol; Kusolwisitkul, Wilai; Pichainarong, Natchaporn; Kerdmongkol, Patcharaporn; Silapasuwan, Phimpan; Hamann, Stephen L; Arpawong, Thalida Em

    2012-09-01

    Previous studies among Buddhist monks in Thailand have reported smoking rates to be as high as 55%. Because 95% of Thais are Buddhist, monks are highly influential in establishing normative behavioral patterns. As the first population-based study on smoking among Buddhist monks in Thailand, this study aims to determine the smoking prevalence in six regions of the country, and to examine smoking knowledge, risk perceptions, behaviors, and associated demographics among full-fledged and novice monks (n = 6,213). Results demonstrated that the overall prevalence for current smoking monks is 24.4% (95% confidence interval [24.453, 24.464]), with regional differences ranging from 14.6% (North) to 40.5% (East). Findings suggest that integrating prevention and cessation programming into religious courses may be one avenue for reaching many incoming monks. Further, involving monks in tobacco control education and setting a nonsmoking standard among them is vital to the success of reducing smoking rates among the general population in Thailand.

  11. HMSRP Hawaiian Monk Seal Photo Identification Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This photo collection contains identification and other images and video of Hawaiian monk seals taken by PSD personnel and cooperating scientists as part of the...

  12. HMSRP Hawaiian Monk Seal Entanglement data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The data set contains records of all entanglements of Hawaiian monk seals in marine debris. The data set comprises records of seals entangled by derelict fishing...

  13. HMSRP Hawaiian Monk Seal Tag Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains records for all tags applied to Hawaiian monk seals since 1981. These tags were applied by PSD personnel and cooperating scientists as part of...

  14. HMSRP Hawaiian Monk Seal Necropsy Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains information on Hawaiian monk seal gross necropsy (in some cases only field notes or minimal information) and histopathology results beginning...

  15. HMSRP Hawaiian Monk Seals on Social Media

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — As social media platforms develop, they potentially provide valuable information for wildlife researchers and managers. NOAA’s Hawaiian Monk Seal Research Program...

  16. HMSRP Hawaiian Monk Seal Crittercam video

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This project investigates foraging behavior of Hawaiian monk seals by conducting telemetry studies. During these studies, live seals are instrumented with dive...

  17. HMSRP Hawaiian Monk Seal Survey Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains records of Hawaiian monk seal and green turtle sightings in the Northwestern Hawaiian Islands (NWHI) since 1982 at Lisianski Island, and since...

  18. HMSRP Hawaiian Monk Seal Survival Factors

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains records of survival factors recorded by PSD personnel and cooperating scientists as part of the ongoing monk seal population assessment...

  19. HMSRP Hawaiian Monk Seal Handling Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains records for all handling and measurement of Hawaiian monk seals since 1981. Live seals are handled and measured during a variety of events...

  20. HMSRP Hawaiian Monk Seal Fisheries Interactions data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The data set contains records of all documented hookings and/or entanglements of Hawaiian monk seals with actively fished gear, both commercial and recreational. The...

  1. Contamination and potential impacts to monk seals

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — There are six main Hawaiian monk seal breeding colonies (French Frigate Shoals, Kure Atoll, Laysan Island, Lisianski Island, Pearl and Hermes Reef and Midway Atoll)...

  2. HMSRP Hawaiian Monk Seal Microsatellite Genotypes

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Currently ~2,400 Hawaiian monk seal specimens have been analyzed genetically, providing genotypes at 18 microsatellite loci. These data are organized by individual,...

  3. Circuital model for the spherical geodesic waveguide perfect drain

    Science.gov (United States)

    González, Juan C.; Grabovičkić, Dejan; Benítez, Pablo; Miñano, Juan C.

    2012-08-01

    The perfect drain for the Maxwell fish eye (MFE) is a non-magnetic dissipative region placed in the focal point to absorb all the incident radiation without reflection or scattering. The perfect drain was recently designed as a material with complex permittivity that depends on frequency. However, this material is only a theoretical material, so it cannot be used in practical devices. The perfect drain has been claimed as necessary for achieving super-resolution (Leonhardt 2009 New J. Phys. 11 093040), which has increased the interest in practical perfect drains suitable for manufacturing. Here, we present a practical perfect drain that is designed using a simple circuit (made of a resistance and a capacitor) connected to the coaxial line. Moreover, we analyze the super-resolution properties of a device equivalent to the MFE, known as a spherical geodesic waveguide, loaded with this perfect drain. The super-resolution analysis for this device is carried out using COMSOL Multiphysics. The results of simulations predict a super-resolution of up to λ/3000.

  4. Circuital model for the Maxwell Fish Eye perfect drain

    CERN Document Server

    Gonzalez, Juan C; Minano, Juan C; Benitez, Pablo

    2012-01-01

    Perfect drain for the Maxwell Fish Eye (MFE) is a non-magnetic dissipative region placed in the focal point to absorb all the incident radiation without reflection or scattering. The perfect drain was recently designed as a material with complex electrical permittivity that depends on frequency. However, this material is only a theoretical material, so it can not be used in practical devices. Recently, the perfect drain has been claimed as necessary to achieve super-resolution [Leonhard 2009, New J. Phys. 11 093040], which has increased the interest for practical perfect drains suitable for manufacturing. Here, we analyze the super-resolution properties of a device equivalent to the MFE, known as Spherical Geodesic Waveguide (SGW), loaded with the perfect drain. In the SGW the source and drain are implemented with coaxial probes. The perfect drain is realized using a circuit (made of a resistance and a capacitor) connected to the drain coaxial probes. Super-resolution analysis for this device is done in Comso...

  5. Kantowski-Sachs Einstein-aether perfect fluid models

    CERN Document Server

    Latta, Joey

    2016-01-01

    We investigate Kantowski-Sachs models in Einstein-aether theory with a perfect fluid source using dynamical system tools. We find an inflationary source at early times, and an inflationary sink at late times, for a wide region in the parameter space. The results by A. A. Coley, G. Leon, P. Sandin and J. Latta, JCAP {\\bf 12}, 010 (2015) are then re-obtained as particular cases. Additionally, we select other values for non-GR parameters which are consistent with current constraints, getting a very rich phenomenology. Particularly, we find solutions with infinite shearing, zero curvature, and infinity matter energy density in comparison with the Hubble scalar. We also have stiff-like future attractors, anisotropic late-time attractors, or both, in some special cases. Such results are developed analytically, and then verified by numerics. From the cosmological point of view, the more interesting fixed points are those representing accelerated solutions. However, the accelerated solutions do not isotropize, and th...

  6. Kantowski-Sachs Einstein-æther perfect fluid models

    Science.gov (United States)

    Latta, Joey; Leon, Genly; Paliathanasis, Andronikos

    2016-11-01

    We investigate Kantowski-Sachs models in Einstein-æ ther theory with a perfect fluid source using the singularity analysis to prove the integrability of the field equations and dynamical system tools to study the evolution. We find an inflationary source at early times, and an inflationary sink at late times, for a wide region in the parameter space. The results by A.A. Coley, G. Leon, P. Sandin and J. Latta (JCAP 12 (2015) 010), are then re-obtained as particular cases. Additionally, we select other values for the non-GR parameters which are consistent with current constraints, getting a very rich phenomenology. In particular, we find solutions with infinite shear, zero curvature, and infinite matter energy density in comparison with the Hubble scalar. We also have stiff-like future attractors, anisotropic late-time attractors, or both, in some special cases. Such results are developed analytically, and then verified by numerics. Finally, the physical interpretation of the new critical points is discussed.

  7. History of nonnative Monk Parakeets in Mexico.

    Science.gov (United States)

    Hobson, Elizabeth A; Smith-Vidaurre, Grace; Salinas-Melgoza, Alejandro

    2017-01-01

    Nonnative Monk Parakeets have been reported in increasing numbers across many cities in Mexico, and were formally classified as an invasive species in Mexico in late 2016. However, there has not been a large-scale attempt to determine how international pet trade and national and international governmental regulations have played a part in colonization, and when the species appeared in different areas. We describe the changes in regulations that led the international pet trade market to shift to Mexico, then used international trade data to determine how many parakeets were commercially imported each year and where those individuals originated. We also quantified the recent increases in Monk Parakeet (Myiopsitta monachus) sightings in Mexico in both the scientific literature and in citizen science reports. We describe the timeline of increased reports to understand the history of nonnative Monk Parakeets in Mexico. As in other areas where the species has colonized, the main mode of transport is through the international pet trade. Over half a million Monk Parakeets were commercially imported to Mexico during 2000-2015, with the majority of importation (90%) occurring in 2008-2014, and almost all (98%) were imported from Uruguay. The earliest record of a free-flying Monk Parakeet was observed during 1994-1995 in Mexico City, but sightings of the parakeets did not become geographically widespread in either the scientific literature or citizen science databases until 2012-2015. By 2015, parakeets had been reported in 97 cities in Mexico. Mexico City has consistently seen steep increases in reporting since this species was first reported in Mexico. Here we find that both national and international legal regulations and health concerns drove a rise and fall in Monk Parakeet pet trade importations, shortly followed by widespread sightings of feral parakeets across Mexico. Further monitoring of introduced Monk Parakeet populations in Mexico is needed to understand the

  8. Cost-effective description of strong correlation: efficient implementations of the perfect quadruples and perfect hextuples models

    CERN Document Server

    Lehtola, Susi; Head-Gordon, Martin

    2016-01-01

    Novel implementations based on dense tensor storage are presented for the singlet-reference perfect quadruples (PQ) [Parkhill, Lawler, and Head-Gordon, J. Chem. Phys. 130, 084101 (2009)] and perfect hextuples (PH) [Parkhill and Head-Gordon, J. Chem. Phys. 133, 024103 (2010)] models. The methods are obtained as block decompositions of conventional coupled-cluster theory that are exact for four electrons in four orbitals (PQ) and six electrons in six orbitals (PH), but that can also be applied to much larger systems. PQ and PH have storage requirements that scale as the square, and as the cube of the number of active electrons, respectively, and exhibit quartic scaling of the computational effort for large systems. Applications of the new implementations are presented for full-valence calculations on linear polyenes (C n H n+2 ), which highlight the excellent computational scaling of the present implementations that can routinely handle active spaces of hundreds of electrons. The accuracy of the models is studi...

  9. Cost-effective description of strong correlation: Efficient implementations of the perfect quadruples and perfect hextuples models

    Science.gov (United States)

    Lehtola, Susi; Parkhill, John; Head-Gordon, Martin

    2016-10-01

    Novel implementations based on dense tensor storage are presented for the singlet-reference perfect quadruples (PQ) [J. A. Parkhill et al., J. Chem. Phys. 130, 084101 (2009)] and perfect hextuples (PH) [J. A. Parkhill and M. Head-Gordon, J. Chem. Phys. 133, 024103 (2010)] models. The methods are obtained as block decompositions of conventional coupled-cluster theory that are exact for four electrons in four orbitals (PQ) and six electrons in six orbitals (PH), but that can also be applied to much larger systems. PQ and PH have storage requirements that scale as the square, and as the cube of the number of active electrons, respectively, and exhibit quartic scaling of the computational effort for large systems. Applications of the new implementations are presented for full-valence calculations on linear polyenes (CnHn+2), which highlight the excellent computational scaling of the present implementations that can routinely handle active spaces of hundreds of electrons. The accuracy of the models is studied in the π space of the polyenes, in hydrogen chains (H50), and in the π space of polyacene molecules. In all cases, the results compare favorably to density matrix renormalization group values. With the novel implementation of PQ, active spaces of 140 electrons in 140 orbitals can be solved in a matter of minutes on a single core workstation, and the relatively low polynomial scaling means that very large systems are also accessible using parallel computing.

  10. Modelling general relativistic perfect fluids in field theoretic language

    CERN Document Server

    Mitskievich, N V

    1999-01-01

    Skew-symmetric massless fields, their potentials being $r$-forms, are close analogues of Maxwell's field (though the non-linear cases also should be considered). We observe that only two of them ($r=$2 and 3) automatically yield stress-energy tensors characteristic to normal perfect fluids. It is shown that they naturally describe both non-rotating ($r=2$) and rotating (then a combination of $r=2$ and $r=3$ fields is indispensable) general relativistic perfect fluids possessing every type of equations of state. Meanwile, a free $r=3$ field is completely equivalent to appearance of the cosmological term in Einstein's equations. Sound waves represent perturbations propagating on the background of the $r=2$ field. Some exotic properties of these two fields are outlined.

  11. Are Mediterranean Monk Seals, Monachus monachus, Being Left to Save Themselves from Extinction?

    Science.gov (United States)

    Notarbartolo di Sciara, G; Kotomatas, S

    Mediterranean monk seals (Monachus monachus), amongst the most endangered marine mammals, are showing localised signs of recovery warranting their recent down-listing, from Critically Endangered to Endangered, on the International Union for the Conservation of Nature (IUCN) Red List. This, however, cannot be taken as a reason for complacency, as the species' condition is still very critical, having been extirpated from most of its historical range. Monk seals within the Mediterranean, a 'unit to conserve' separate from Atlantic conspecifics, were once widely distributed throughout the Mediterranean Sea, with their range also extending into the Sea of Marmara and the Black Sea. Today breeding nuclei persist only in the northeastern portion of the region, in Greek, Turkish and Cypriot waters. The main reasons for their decline include deliberate killing and human encroachment of their critical habitat. Past conservation efforts have mostly failed due to the inability of implementing institutional commitments, lack of coordination and continuity of efforts and insufficient consideration of the socioeconomic implications of conserving monk seals. Yet the small reversal of the species' decline that has been observed in Greece may have resulted from conservation efforts by civil society, combined with ongoing societal change within the local communities coexisting with the seals. The inaccessibility of large portions of monk seal habitat in the Eastern Mediterranean Sea may also have contributed, by offering to the monk seals a refuge from persecution and encroachment. Despite continued threats to monk seals, conservation activities at the local scale that utilise lessons learned from previous failures and successes could secure the survival of the largest Mediterranean colony of monk seals, while also providing a model to support the species' recovery in other portions of its former range. © 2016 Elsevier Ltd. All rights reserved.

  12. Validation and application of noninvasive glucocorticoid and thyroid hormone measures in free-ranging Hawaiian monk seals.

    Science.gov (United States)

    Gobush, K S; Booth, R K; Wasser, S K

    2014-01-01

    We validate fecal glucocorticoid (GC) and thyroid (T3) hormone metabolite measures in the Critically Endangered Hawaiian monk seal for the first time, and examine variation in the concentrations of these hormones in individuals across the species' range. We test hypotheses that monk seals from declining subpopulations have relatively high GCs and low T3 on average suggesting impacts of food limitation, and that this hormone pattern is more apparent in immature animals compared to adults, as food limitation is specifically indicated as a principal cause of poor body condition and survival of juvenile monk seals. We opportunistically sampled scat from 84 individually identifiable monk seals during the 2010 breeding season from two geographic regions, the main Hawaiian Islands (MHI) and the Northwestern Hawaiian Islands (NWHI). The MHI subpopulation of monk seals is growing, whereas subpopulations at many sites in the NWHI are in decline. Best fit general linear models predicting variation in GCs and T3 (examined separately) were similar (after accounting for significantly elevated hormone concentrations associated with molt and possibly lactation); both included sample date, region, and monk seal age as predictors. GC concentrations were significantly lower in MHI versus NWHI monk seals and decreased as the breeding season progressed. T3 concentrations were significantly lower in immature monk seals compared to adults. GC and T3 concentrations were positively correlated at 4 NWHI sites; prey may be adequate for physiological growth or maintenance at these sites but relatively stressful to acquire. GCs were highest at French Frigate Shoals, (a NWHI site) while T3 was relatively low here, indicating a possible signal of food limitation. GCs were lowest in the MHI. Disturbance associated with living near a high human population in the MHI appears to impact monk seal physiology less than other stressors encountered in the remote and highly protected NWHI where human

  13. A hybrid of monopoly and perfect competition model for hi-tech products

    Science.gov (United States)

    Yang, P. C.; Wee, H. M.; Pai, S.; Yang, H. J.; Wee, P. K. P.

    2010-11-01

    For Hi-tech products, the demand rate, the component cost as well as the selling price usually decline significantly with time. In the case of perfect competition, shortages usually result in lost sales; while in a monopoly, shortages will be completely backordered. However, neither perfect competition nor monopoly exists. Therefore, there is a need to develop a replenishment model considering a hybrid of perfect competition and monopoly when the cost, price and demand are decreasing simultaneously. A numerical example and sensitivity analysis are carried out to illustrate this model. The results show that a higher decline-rate in the component cost leads to a smaller service level and a larger replenishment interval. When the component cost decline rate increases and the selling price decline rate decreases simultaneously, the replenishment interval decreases. In perfect competition it is better to have a high service level, while for the case with monopoly, keeping a low service level is better due to complete backordering.

  14. Bianchi VI cosmological models representing perfect fluid and radiation with electric-type free gravitational fields

    Science.gov (United States)

    Roy, S. R.; Banerjee, S. K.

    1992-11-01

    A homogeneous Bianchi type VIh cosmological model filled with perfect fluid, null electromagnetic field and streaming neutrinos is obtained for which the free gravitational field is of the electric type. The barotropic equation of statep = (γ-1)ɛ is imposed in the particular case of Bianchi VI0 string models. Various physical and kinematical properties of the models are discussed.

  15. The monk (1796: a hispanist's reading

    Directory of Open Access Journals (Sweden)

    Abigail Lee Six

    2012-11-01

    Full Text Available http://dx.doi.org/10.5007/2175-8026.2012n62p25   This article argues that the honour plays of seventeenth-centurySpain have been overlooked as precursors to the Gothic. ReadingLewis’s The Monk through this prism reveals that Spanishconcept of honour plays sheds light upon the characterization ofAmbrosio. Furthermore, the honour code gives rise to numerousareas of common ground with the Gothic, including the centralityof sexual secrets, imprisoned women, and a predilection forgore. Lewis’s opportunities for access to this Spanish corpus areconsidered and finally, it is posited that the post-eighteenthcenturyfigure of the Gothic villain who is troubled and complexmay be traceable, via The Monk, to the Spanish Golden Age.

  16. Bianchi Type-Ⅰ Massive String Magnetized Barotropic Perfect Fluid Cosmological Model in General Relativity

    Institute of Scientific and Technical Information of China (English)

    BALI Raj; PAREEK Umesh Kumar; PRADHAN Anirudh

    2007-01-01

    @@ Bianchi type-Ⅰ massive string cosmological model with magnetic field of barotropic perfect fluid distribution through the techniques used by Latelier and Stachel is investigated. To obtain the deterministic model of the universe, it is assumed that the universe is filled with barotropic perfect fluid distribution. The magnetic field is due to electric current produced along the x-axis with infinite electrical condúctivity. The behaviour of the model in the presence and absence of magnetic field together with other physical aspects is further discussed.

  17. Use of numerical simulation modeling for perfecting coal industry projects

    Energy Technology Data Exchange (ETDEWEB)

    Gao, Y.; Abramovich, B.N. (Kitaiskii Gornyi Universitet (China))

    1992-02-01

    Evaluates digital computerized simulation of operation of control systems for a hydraulic haulage system of the MLS-170 coal cutter loader used in China. A structural scheme of a mathematical model of the hydraulic haulage system is discussed. The BGLS program package for haulage system modeling is described. Modeling haulage system start-up and oil pressure fluctuations and their causes is evaluated. Practical aspects of use of the digital computerized simulation by manufacturers of the MLS-170 haulage system for its modifications are discussed. 3 refs

  18. Evaluation of Horizontal Electric Field Under Different Lightning Current Models by Perfect Ground Assumption

    Institute of Scientific and Technical Information of China (English)

    LIANG Jianfeng; LI Yanming

    2012-01-01

    Lightning electromagnetics can affect the reliability of the power system or communication system.Therefore,evaluation of electromagnetic fields generated by lightning return stroke is indispensable.Arnold sommerfeld proposed a model to calculate the electromagnetic field,but it involved the time-consuming sommerfeld integral.However,perfect conductor ground assumption can account for fast calculation,thus this paper reviews the perfect ground equation for evaluation of lightning electromagnetic fields,presents three engineering lightning return stroke models,and calculates the horizontal electric field caused by three lightning return stroke models.According to the results,the amplitude of lightning return stroke has a strong impact on horizontal electric fields,and the steepness of lightning return stroke influences the horizontal electric fields.Moreover,the perfect ground method is faster than the sommerfeld integral method.

  19. Role of the constant deceleration parameter in cosmological models with perfect fluid and dark energy

    CERN Document Server

    Pawar, D D; Mapari, R V

    2016-01-01

    The main purpose of the present paper is to investigate LRS Bianchi type I metric in the presence of perfect fluid and dark energy. In order to obtain a deterministic solution of the field equations we have assumed that, the two sources of the perfect fluid and dark energy interact minimally with separate conservation of their energy momentum tensors. The EoS parameter of the perfect fluid is also assumed to be constant. In addition to these we have used a special law of variation of Hubble parameter proposed by Berman that yields constant deceleration parameter. For two different values of the constant deceleration parameters we have obtained two different cosmological models. The physical behaviors of both the models have been discussed by using some physical parameters.

  20. Modeling the unknown: how to make a perfect whale.

    Science.gov (United States)

    Rossi, Michael

    2008-06-01

    Making a life-sized model of a blue whale is difficult. Making one to the exacting standards of 'scientific accuracy' is backbreaking. When, in the early 1960s, the American Museum of Natural History in New York undertook to fabricate a replica of the largest animal that ever lived, little was known about how blue whales really looked and behaved in the wild. Exhibitors like Richard Van Gelder guided themselves by old photographs, illustrations, tables of measurements and the experience of other institutions--as well as their own educated guesswork, and ideas of beauty, value and pride.

  1. Robertson-Walker cosmological models with perfect fluid in general relativity

    Institute of Scientific and Technical Information of China (English)

    Rishi Kumar Tiwari

    2011-01-01

    Einstein's field equations with variable gravitational and cosmological constants are considered in the presence of perfect fluid for a Robertson-Walker universe by assuming the cosmological term to be proportional to R-m (R is a scale factor and m is a constant). A variety of solutions is presented. The physical significance of the cosmological models has also been discussed.

  2. Interaction between Monk Seals, Monachus monachus (Hermann, 1779), and artisanal fisheries in the Foca Pilot Monk Seal conservation area, Turkey

    NARCIS (Netherlands)

    Guclusoy, H.

    2008-01-01

    The present study examines some aspects of the interaction between critically endangered Monk Seals Monachus monachus and artisanal fisheries in the Foc¿a Pilot Monk Seal Conservation Area, Turkey, between 1994 and 2002. One to four permanent researchers collected the data on this interaction during

  3. A Perfect Price Discrimination Market Model with Production, and a (Rational) Convex Program for It

    Science.gov (United States)

    Goel, Gagan; Vazirani, Vijay

    Recent results showed PPAD-completeness of the problem of computing an equilibrium for Fisher's market model under additively separable, piecewise-linear, concave utilities. We show that introducing perfect price discrimination in this model renders its equilibrium polynomial time computable. Moreover, its set of equilibria are captured by a convex program that generalizes the classical Eisenberg-Gale program, and always admits a rational solution.

  4. How efficient can an emergency unit be? A perfect world model.

    Science.gov (United States)

    Baboolal, Kesh; Griffiths, Jeff D; Knight, Vincent A; Nelson, Andrew V; Voake, Cheryl; Williams, Janet E

    2012-12-01

    Various approaches have been used to identify possible routes for improvement of patient flow within an emergency unit (EU). One such approach is to use simulation to create a 'real world' model of an EU and carry out various tests to gauge ways of improvement. This paper proposes a novel approach in which simulation is used to create a 'perfect world model'. The EU at a major UK hospital is modelled not as it is, but as it could be. The 'efficiency gap' between the 'perfect world' and the 'real world' demonstrates how operational research can be used effectively to identify the location of bottlenecks in the current 'whole hospital' patient pathway and can be used in the planning and managing of hospital resources to ensure the most effective use of those resources.

  5. Inadequacy of perfect-reflector models in cavity QED for systems with low-frequency excitations.

    Science.gov (United States)

    Eberlein, Claudia; Robaschik, Dieter

    2004-06-11

    It is shown that the model of perfectly reflecting boundaries widely employed in cavity QED is unsuitable for systems that have long-wavelength excitations. A prime example is a free charged particle near a reflecting wall. Modeling the wall as perfectly reflecting from the outset ignores evanescent waves that couple to the particle through virtual excitations at low energies, which can lead to errors in order of magnitude and even sign. The example of a free electron near an imperfectly reflecting wall characterized by a constant frequency-independent refractive index n is investigated in detail by determining its energy shift relative to an electron in vacuum through both nonrelativistic and relativistic calculations.

  6. Model-checking ATL under Imperfect Information and Perfect Recall Semantics is Undecidable

    CERN Document Server

    Dima, Catalin

    2011-01-01

    We propose a formal proof of the undecidability of the model checking problem for alternating- time temporal logic under imperfect information and perfect recall semantics. This problem was announced to be undecidable according to a personal communication on multi-player games with imperfect information, but no formal proof was ever published. Our proof is based on a direct reduction from the non-halting problem for Turing machines.

  7. Perfect fluid Bianchi Type-I cosmological models with time varying and

    Indian Academy of Sciences (India)

    J P Singh; R K Tiwari

    2008-04-01

    Bianchi Type-I cosmological models containing perfect fluid with time varying and have been presented. The solutions obtained represent an expansion scalar bearing a constant ratio to the anisotropy in the direction of space-like unit vector . Of the two models obtained, one has negative vacuum energy density, which decays numerically. In this model, we obtain ∼ 2, ∼ 44/ and ∼ -2 ( is the cosmic time) which is in accordance with the main dynamical laws for the decay of . The second model reduces to a static solution with repulsive gravity.

  8. A kinematic model for the formation of duplex systems with a perfectly planar roof thrust

    Science.gov (United States)

    Contreras, Juan; Suter, Max

    1997-03-01

    We present a cross-sectional kinematic forward model for the formation of duplexes with a perfectly planar roof thrust. The major assumptions are a constant dip and constant spacing of the ramps in the undeformed state and sequential deformation in the direction of tectonic transport, with equal displacement along each ramp. The model is based on a coordinate transformation that simulates flexural slip parallel to the active fault surface. This causes angular parallel folds and keeps the layer thickness constant, except in the forelimbs of the horses. Attempts by previous workers to simulate the formation of duplexes with a perfectly planar roof thrust, on the other hand, were based on the assumptions of constant bed thickness and bed length, or a different topology of the axial planes delimiting the forelimbs of the horses, and resulted in corrugated roof thrusts. We show that it is not possible to form a flat roof duplex type and preserve the forelimb thickness of the horses under flexural slip parallel to the active fault. We describe duplexes by three parameters which are the separation s between ramps, the ramp length l, and the displacement u along the ramps. In a {u}/{s} vs {l}/{s} diagram, duplexes with a perfectly planar roof thrust, resulting from numerical experiments with our kinematic algorithm, occupy specific families of straight lines. Our results are independent of the dip or internal geometry of the thrust ramps.

  9. Distribution patterns of invasive Monk parakeets (Myiopsitta monachus in an urban habitat

    Directory of Open Access Journals (Sweden)

    Rodríguez–Pastor, R.

    2012-01-01

    Full Text Available Several invasive species have been shown to have a marked preference for urban habitats. The study of the variables responsible for the distribution of these species within urban habitats should allow to predict which environmental variables are indicative of preferred habitat, and to design landscape characteristics that make these areas less conducive to these species. The Monk parakeet Myiopsitta monachus is an invasive species in many American and European countries, and cities are one of its most usual habitats in invaded areas. The aim of this paper was to identify the main factors that determine distribution of the Monk parakeet in Barcelona, one of the cities in the world with the highest parakeet density. We defined our model based on eight preselected variables using a generalized linear model (GLZ and evaluated the strength of support for each model using the AIC–based multi–model inference approach. We used parakeet density as a dependent variable, and an analysis restricted to occupied neighbourhoods provided a model with two key variables to explain the distribution of the species. Monk parakeets were more abundant in neighbourhoods with a high density of trees and a high percentage of people over 65 years. This is interpreted by the fact that parakeets use trees as food sources and support for the nests, and that older people often feed the species. Data support the ‘human–activity’ hypothesis to explain how invasive species can successfully establish in a non–native habitat, and stress how limiting food resources, especially food supplied by humans, may be the easiest way to exert some control on Monk parakeet populations.

  10. [Fatal poisoning caused by aconite monk's hood (Aconitum napellus)].

    Science.gov (United States)

    Feldkamp, A; Köster, B; Weber, H P

    1991-06-01

    Severe intoxications after ingestion of monk's hood are rare in childhood. We report a case of fatal intoxication in a 20 months old child. There is no specific therapy available. A review of the literature is added.

  11. HMSRP Hawaiian Monk Seal Cell Phone Tag Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This project investigates foraging behavior of Hawaiian monk seals by conducting telemetry studies. During these studies, live seals are instrumented with dive...

  12. LEGACY - EOP CRITTERCAM Deployments on French Frigate Shoals monk seals

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — CRITTERCAMs, were deployed on a 42 monk seals at French Frigate Shoals Hawaii. Sixty nine hours of video comprised of 3192 recording segments collected at...

  13. HMSRP Hawaiian Monk Seal Master Identification Records (seal)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains records of all individually identified Hawaiian monk seals since 1981. These seals were identified by PSD personnel and cooperating scientists...

  14. HMSRP Hawaiian Monk Seal Master Identification Records (annual)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains records of all individually identified Hawaiian monk seals since 1981. These seals were identified by PSD personnel and cooperating scientists...

  15. Legacy HMSRP Hawaiian Monk Seal Scat-spew data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This project investigates the dietary consumption of Hawaiian monk seals using traditional dietary analysis of fecal and regurgitate samples. Samples are collected...

  16. Recurrent network models for perfect temporal integration of fluctuating correlated inputs.

    Directory of Open Access Journals (Sweden)

    Hiroshi Okamoto

    2009-06-01

    Full Text Available Temporal integration of input is essential to the accumulation of information in various cognitive and behavioral processes, and gradually increasing neuronal activity, typically occurring within a range of seconds, is considered to reflect such computation by the brain. Some psychological evidence suggests that temporal integration by the brain is nearly perfect, that is, the integration is non-leaky, and the output of a neural integrator is accurately proportional to the strength of input. Neural mechanisms of perfect temporal integration, however, remain largely unknown. Here, we propose a recurrent network model of cortical neurons that perfectly integrates partially correlated, irregular input spike trains. We demonstrate that the rate of this temporal integration changes proportionately to the probability of spike coincidences in synaptic inputs. We analytically prove that this highly accurate integration of synaptic inputs emerges from integration of the variance of the fluctuating synaptic inputs, when their mean component is kept constant. Highly irregular neuronal firing and spike coincidences are the major features of cortical activity, but they have been separately addressed so far. Our results suggest that the efficient protocol of information integration by cortical networks essentially requires both features and hence is heterotic.

  17. FOI-PERFECT code: 3D relaxation MHD modeling and Applications

    Science.gov (United States)

    Wang, Gang-Hua; Duan, Shu-Chao; Comutational Physics Team Team

    2016-10-01

    One of the challenges in numerical simulations of electromagnetically driven high energy density (HED) systems is the existence of vacuum region. FOI-PERFECT code adopts a full relaxation magnetohydrodynamic (MHD) model. The electromagnetic part of the conventional model adopts the magnetic diffusion approximation. The vacuum region is approximated by artificially increasing the resistivity. On one hand the phase/group velocity is superluminal and hence non-physical in the vacuum region, on the other hand a diffusion equation with large diffusion coefficient can only be solved by implicit scheme which is difficult to be parallelized and converge. A better alternative is to solve the full electromagnetic equations. Maxwell's equations coupled with the constitutive equation, generalized Ohm's law, constitute a relaxation model. The dispersion relation is given to show its transition from electromagnetic propagation in vacuum to resistive MHD in plasma in a natural way. The phase and group velocities are finite for this system. A better time stepping is adopted to give a 3rd full order convergence in time domain without the stiff relaxation term restriction. Therefore it is convenient for explicit & parallel computations. Some numerical results of FOI-PERFECT code are also given. Project supported by the National Natural Science Foundation of China (Grant No. 11571293) And Foundation of China Academy of Engineering Physics (Grant No. 2015B0201023).

  18. A NOVEL SLIGHTLY COMPRESSIBLE MODEL FOR LOW MACH NUMBER PERFECT GAS FLOW CALCULATION

    Institute of Scientific and Technical Information of China (English)

    邓小刚; 庄逢甘

    2002-01-01

    By analyzing the characteristics of low Mach number perfect gas flows, a novel Slightly Compressible Model (SCM) for low Mach number perfect gas flows is derived. In view of numerical calculations, this model is proved very efficient,for it is kept within the p-v frame but does not have to satisfy the time consuming divergence-free condition in order to get the incompressible Navier-Stokes equation solutions. Writing the equations in the form of conservation laws, we have derived the characteristic systems which are necessary for numerical calculations. A cellcentered finite-volume method with flux difference upwind-biased schemes is used for the equation solutions and a new Exact Newton Relaxation (ENR) implicit method is developed. Various computed results are presented to validate the present model.Laminar flow solutions over a circular cylinder with wake developing and vortex shedding are presented. Results for inviscid flow over a sphere are compared in excellent agreement with the exact analytic incompressible solution. Three-dimensional viscous flow solutions over sphere and prolate spheroid are also calculated and compared well with experiments and other incompressible solutions. Finally, good convergent performaces are shown for sphere viscous flows.

  19. Development of a perfect prognosis probabilistic model for prediction of lightning over south-east India

    Indian Academy of Sciences (India)

    M Rajeevan; A Madhulatha; M Rajasekhar; Jyoti Bhate; Amit Kesarkar; B V Appa Rao

    2012-04-01

    A prediction model based on the perfect prognosis method was developed to predict the probability of lightning and probable time of its occurrence over the south-east Indian region. In the perfect prognosis method, statistical relationships are established using past observed data. For real time applications, the predictors are derived from a numerical weather prediction model. In the present study, we have developed the statistical model based on Binary Logistic Regression technique. For developing the statistical model, 115 cases of lightning that occurred over the south-east Indian region during the period 2006–2009 were considered. The probability of lightning (yes or no) occurring during the 12-hour period 0900–2100 UTC over the region was considered as the predictand. The thermodynamic and dynamic variables derived from the NCEP Final Analysis were used as the predictors. A three-stage strategy based on Spearman Rank Correlation, Cumulative Probability Distribution and Principal Component Analysis was used to objectively select the model predictors from a pool of 61 potential predictors considered for the analysis. The final list of six predictors used in the model consists of the parameters representing atmospheric instability, total moisture content in the atmosphere, low level moisture convergence and lower tropospheric temperature advection. For the independent verifications, the probabilistic model was tested for 92 days during the months of May, June and August 2010. The six predictors were derived from the 24-h predictions using a high resolution Weather Research and Forecasting model initialized with 00 UTC conditions. During the independent period, the probabilistic model showed a probability of detection of 77% with a false alarm rate of 35%. The Brier Skill Score during the independent period was 0.233, suggesting that the prediction scheme is skillful in predicting the lightning probability over the south-east region with a reasonable accuracy.

  20. Decreased mortality among contemplative monks in The Netherlands.

    Science.gov (United States)

    de Gouw, H W; Westendorp, R G; Kunst, A E; Mackenbach, J P; Vandenbroucke, J P

    1995-04-15

    Although it is generally believed that a simple lifestyle may promote health, a recent study among Trappist and Benedictine monks in the Netherlands reported an increase in general morbidity (Am J Epidemiol 1993;138:569-73). As this increased morbidity might be the consequence of an increased life expectancy, we studied the level of mortality among these contemplative monks. Standardized mortality ratios (SMRs) and death rates were calculated from 1,523 monks whose data were abstracted from the monastery rolls of the period 1900-1994. For this period the SMR was 0.88 (95% confidence interval (CI) 0.81-0.95). A lower SMR was present in almost all of the age categories and in all except one of the monasteries. There were two distinct subperiods. In the pre-World War II era, the SMR was 1.25 (95% CI 1.04-1.49), but it lowered to 0.76 (95% CI 0.69-0.85) after World War II. From 1950 on, mortality in the monasteries remained lower than in the general population, even after correction for the generally higher educational level of the monks. The death rates showed a continuing decline from 1900 to 1950. After 1950, the mortality among monks declined further at a time when the secular trend of decreasing mortality leveled off in the general male population. The higher mortality before World War II was largely unexplained. From the 1950s onward, the mortality among monks was lower, presumably because of the epidemic of lung cancer and cardiovascular disease in the general population. Taken together, the present and earlier data suggest that, among contemplative monks, a simple lifestyle is associated with an extension of life in which they suffer from nonfatal morbidity.

  1. HMSRP Hawaiian Monk Seal Island/Sector Locations for Data Collection

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set documents locations and location codes used in monk seal data collection as part of the ongoing monk seal population assessment efforts. Information...

  2. Perfect plastic approximation revisited: a flowline network model for calving glaciers

    Science.gov (United States)

    Ultee, E.; Bassis, J. N.

    2015-12-01

    Accurate modeling of outlet glacier dynamics requires knowledge of many factors—ice thickness, bed topography, air/ocean temperature, precipitation rate—specific to individual glaciers, and for which only limited data exists. Furthermore, key processes such as iceberg calving remain poorly understood and difficult to include in models. In light of these challenges to even the most sophisticated models, there is great value in simple, computationally efficient models that can capture first-order effects. Many of the simplest models currently in use produce glacier profiles along a central flowline, either ignoring the contribution of tributaries or relying on a measure of "equivalent width" to handle those contributions. Here, we present a simple model that generalizes Nye's 1953 perfect plastic approximation so that it also predicts the position of the glacier terminus based on the yield strength. Moreover, our model simulates not only a central flowline, but the interactions of a network of tributaries. The model requires only minimal information: glacier geometry (network structure and bed topography, available from observation for select glaciers) and basal shear strength (a reasonably-constrained parameter). We apply the model to Columbia Glacier, Alaska and show that, despite its simplicity, the model is able to reproduce observed centerline profiles and terminus retreat for the main branch as well as selected tributaries. Finally, we illustrate how our model can be applied to constrain the calving contribution of individual glaciers to 21st century sea level rise.

  3. A Comparative Study of Marketing Channel Multiagent Stackelberg Model Based on Perfect Rationality and Fairness Preference

    Directory of Open Access Journals (Sweden)

    Kaihong Wang

    2014-01-01

    Full Text Available This paper studies channel consisting of a manufacturer and two retailers. As a basis for comparison, the first, multiagent Stackelberg model has been structured based on perfect rationality. Further, fairness preference theory will be embedded in marketing channel multiagent Stackelberg model, and the results show that if the retailers have a jealous fairness preference, the manufacturer will reduce the wholesale price, retailers will increase the effort level, product sales will be increased, and the total channel utility and manufacturers’ utility will be pareto improvement, but the pareto improvement of retailers’ utility is associated with the interval of jealousy fairness preference coefficient. If the retailers have a sympathetic fairness preference, the manufacturer increases wholesale price, retailers reduce the effort level, and the total channel utility, manufacturer’s utility, and retailers’ utility are less than that of the no fairness preference utility.

  4. Background of relic gravitons in a perfect fluid in quantum cosmological models

    Energy Technology Data Exchange (ETDEWEB)

    Siffert, Beatriz B. [Centro Brasileiro de Pesquisas Fisicas (ICRA/CBPF), Rio de Janeiro, RJ (Brazil). Inst. de Cosmologia, Relatividade e Astrofisica; Bessada, Dennis [Instituto Nacional de Pesquisas Espaciais (INPE), SP (Brazil). Divisao de Astrofisica

    2011-07-01

    Full text: We studied the evolution of tensor cosmological perturbations of quantum origin in cosmological scenarios that predict a contracting phase prior to the present expansion phase. These bouncing models constitute a very plausible alternative to the current cosmological paradigm since they may be able to solve some of the cosmological puzzles present in the standard model, such as the horizon and flatness problems, without the requirement of an initial singularity or special initial conditions. While conventional inflationary models give rise to a relic background of gravitational waves that cannot be detected with present experiments, no such prediction had been made so far using quantum bouncing models. We have obtained analytically the graviton's energy density parameter as a function of time and frequency interval - which is the physical quantity to be confronted with observations - predicted by such models with a perfect fluid equation of state. To obtain the final spectrum, we numerically solved the expression for the density parameter for the time variable. The results can then be compared with the predictions from inflationary models and with the sensitivity curves of gravitational waves current detectors, such as the Virgo and Ligo interferometers, and upcoming detectors, like the LISA space mission, to determine the possibility of detection. (author)

  5. A perfect match of MSSM-like orbifold and resolution models via anomalies

    CERN Document Server

    Blaszczyk, Michael; Nilles, Hans Peter; Ruehle, Fabian

    2011-01-01

    Compactification of the heterotic string on toroidal orbifolds is a promising set-up for the construction of realistic unified models of particle physics. The target space dynamics of such models, however, drives them slightly away from the orbifold point in moduli space. This resolves curvature singularities, but makes the string computations very difficult. On these smooth manifolds we have to rely on an effective supergravity approximation in the large volume limit. By comparing an orbifold example with its blow-up version, we try to transfer the computational power of the orbifold to the smooth manifold. Using local properties, we establish a perfect map of the the chiral spectra as well as the (local) anomalies of these models. A key element in this discussion is the Green-Schwarz anomaly polynomial. It allows us to identify those redefinitions of chiral fields and localized axions in the blow-up process which are relevant for the interactions (such as Yukawa-couplings) in the model on the smooth space.

  6. A forward model for ground penetrating radar imaging of buried perfect electric conductors within the physical optics approximation

    DEFF Research Database (Denmark)

    Polat, Burak; Meincke, Peter

    2004-01-01

    A forward model for ground penetrating radar imaging of buried 3-D perfect electric conductors is addressed within the framework of diffraction tomography. The similarity of the present forward model derived within the physical optics approximation with that derived within the first Born...

  7. Perfectly matched layer for an elastic parabolic equation model in ocean acoustics

    Science.gov (United States)

    Xu, Chuanxiu; Zhang, Haigang; Piao, Shengchun; Yang, Shi'e.; Sun, Sipeng; Tang, Jun

    2017-02-01

    The perfectly matched layer (PML) is an effective technique for truncating unbounded domains with minimal spurious reflections. A fluid parabolic equation (PE) model applying PML technique was previously used to analyze the sound propagation problem in a range-dependent waveguide (Lu and Zhu, 2007). However, Lu and Zhu only considered a standard fluid PE to demonstrate the capability of the PML and did not take improved one-way models into consideration. They applied a [1/1] Padé approximant to the parabolic equation. The higher-order PEs are more accurate than standard ones when a very large angle propagation is considered. As for range-dependent problems, the techniques to handle the vertical interface between adjacent regions are mainly energy conserving and single-scattering. In this paper, the PML technique is generalized to the higher order elastic PE, as is to the higher order fluid PE. The correction of energy conserving is used in range-dependent waveguides. Simulation is made in both acoustic cases and seismo-acoustic cases. Range-independent and range-dependent waveguides are both adopted to test the accuracy and efficiency of this method. The numerical results illustrate that a PML is much more effective than an artificial absorbing layer (ABL) both in acoustic and seismo-acoustic sound propagation modeling.

  8. EVANGELICAL REMINISCENCES IN ANTON CHEKHOV'S SHORT STORY "THE BLACK MONK"

    Directory of Open Access Journals (Sweden)

    Zhilina N. P.

    2008-11-01

    Full Text Available A detailed analysis of evangelical reminiscences in the artistic structure of this Chekhov's story allows us to reveal the philosophic concept, the system of values that causes death of all the main characters in the story, and whose immediate exponent is the black monk.

  9. Lorentz invariant noncommutative algebra for cosmological models coupled to a perfect fluid

    Energy Technology Data Exchange (ETDEWEB)

    Abreu, Everton M.C.; Marcial, Mateus V.; Mendes, Albert C.R.; Oliveira, Wilson [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil); Universidade Federal de Juiz de Fora, MG (Brazil)

    2013-07-01

    Full text: In current theoretical physics there is a relevant number of theoretical investigations that lead to believe that at the first moments of our Universe, the geometry was not commutative and the dominating physics at that time was ruled by the laws of noncommutative (NC) geometry. Therefore, the idea is that the physics of the early moments can be constructed based on these concepts. The first published work using the idea of a NC spacetime were carried out by Snyder who believed that NC principles could make the quantum field theory infinities disappear. However, it did not occur and Snyder's ideas were put to sleep for a long time. The main modern motivations that rekindle the investigation about NC field theories came from string theory and quantum gravity. In the context of quantum mechanics for example, R. Banerjee discussed how NC structures appear in planar quantum mechanics providing a useful way for obtaining them. The analysis was based on the NC algebra used in planar quantum mechanics that was originated from 't Hooft's analysis on dissipation and quantization. In this work we carry out a NC algebra analysis of the Friedmann-Robert-Walker model, coupled to a perfect fluid and in the presence of a cosmological constant. The classical field equations are modified, by the introduction of a shift operator, in order to introduce noncommutativity in these models. (author)

  10. Bianchi Type-I Massive String Magnetized Barotropic Perfect Fluid Cosmological Model in the Bimetric Theory of Gravitation

    Institute of Scientific and Technical Information of China (English)

    N. P. Gaikwad; M. S. Borkar; S. S. Charjan

    2011-01-01

    @@ We investigate the Bianchi type-I massive string magnetized barotropic perfect fluid cosmological model in Rosen's bimetric theory of gravitation with and without a magnetic field by applying the techniques used by Latelier(1979,1980) and Stachel(1983).To obtain a deterministic model of the universe, it is assumed that the universe is filled with barotropic perfect fluid distribution.The physical and geometrical significance of the model are discussed.By comparing our model with the model of Bali et al.(2007), it is realized that there are no big-bang and big-crunch singularities in our model and T=0 is not the time of the big bang, whereas the model of Bali et al.starts with a big bang at T=0.Further, our model is in agreement with Bali et al.(2007) as time increases in the presence, as well as in the absence, of a magnetic field.

  11. Picture perfect

    DEFF Research Database (Denmark)

    Pless, Mette; Sørensen, Niels Ulrik

    ’Picture perfect’ – when perfection becomes the new normal This paper draws on perspectives from three different studies. One study, which focuses on youth life and lack of well-being (Sørensen et al 2011), one study on youth life on the margins of society (Katznelson et al 2015) and one study on...

  12. Bianchi Type-V model with a perfect fluid and -term

    Indian Academy of Sciences (India)

    T Singh; R Chaubey

    2006-09-01

    A self-consistent system of gravitational field with a binary mixture of perfect fluid and dark energy given by a cosmological constant has been considered in Bianchi Type-V universe. The perfect fluid is chosen to be obeying either the equation of state = ρ with ∈ [0, 1] or a van der Waals equation of state. The role of -term in the evolution of the Bianchi Type-V universe has been studied.

  13. Reconstructing extreme AMOC events through nudging of the ocean surface: a perfect model approach

    Science.gov (United States)

    Ortega, Pablo; Guilyardi, Eric; Swingedouw, Didier; Mignot, Juliette; Nguyen, Sébastien

    2017-01-01

    While the Atlantic Meridional Overturning Circulation (AMOC) is thought to be a crucial component of the North Atlantic climate, past changes in its strength are challenging to quantify, and only limited information is available. In this study, we use a perfect model approach with the IPSL-CM5A-LR model to assess the performance of several surface nudging techniques in reconstructing the variability of the AMOC. Special attention is given to the reproducibility of an extreme positive AMOC peak from a preindustrial control simulation. Nudging includes standard relaxation techniques towards the sea surface temperature and salinity anomalies of this target control simulation, and/or the prescription of the wind-stress fields. Surface nudging approaches using standard fixed restoring terms succeed in reproducing most of the target AMOC variability, including the timing of the extreme event, but systematically underestimate its amplitude. A detailed analysis of the AMOC variability mechanisms reveals that the underestimation of the extreme AMOC maximum comes from a deficit in the formation of the dense water masses in the main convection region, located south of Iceland in the model. This issue is largely corrected after introducing a novel surface nudging approach, which uses a varying restoring coefficient that is proportional to the simulated mixed layer depth, which, in essence, keeps the restoring time scale constant. This new technique substantially improves water mass transformation in the regions of convection, and in particular, the formation of the densest waters, which are key for the representation of the AMOC extreme. It is therefore a promising strategy that may help to better constrain the AMOC variability and other ocean features in the models. As this restoring technique only uses surface data, for which better and longer observations are available, it opens up opportunities for improved reconstructions of the AMOC over the last few decades.

  14. Efficiency of perfectly matched layers for seismic wave modeling in second-order viscoelastic equations

    Science.gov (United States)

    Ping, Ping; Zhang, Yu; Xu, Yixian; Chu, Risheng

    2016-12-01

    In order to improve the perfectly matched layer (PML) efficiency in viscoelastic media, we first propose a split multi-axial PML (M-PML) and an unsplit convolutional PML (C-PML) in the second-order viscoelastic wave equations with the displacement as the only unknown. The advantage of these formulations is that it is easy and efficient to revise the existing codes of the second-order spectral element method (SEM) or finite-element method (FEM) with absorbing boundaries in a uniform equation, as well as more economical than the auxiliary differential equations PML. Three models which are easily suffered from late time instabilities are considered to validate our approaches. Through comparison the M-PML with C-PML efficiency of absorption and stability for long time simulation, it can be concluded that: (1) for an isotropic viscoelastic medium with high Poisson's ratio, the C-PML will be a sufficient choice for long time simulation because of its weak reflections and superior stability; (2) unlike the M-PML with high-order damping profile, the M-PML with second-order damping profile loses its stability in long time simulation for an isotropic viscoelastic medium; (3) in an anisotropic viscoelastic medium, the C-PML suffers from instabilities, while the M-PML with second-order damping profile can be a better choice for its superior stability and more acceptable weak reflections than the M-PML with high-order damping profile. The comparative analysis of the developed methods offers meaningful significance for long time seismic wave modeling in second-order viscoelastic wave equations.

  15. Efficiency of perfectly matched layers for seismic wave modeling in second-order viscoelastic equations

    Science.gov (United States)

    Ping, Ping; Zhang, Yu; Xu, Yixian; Chu, Risheng

    2016-09-01

    In order to improve the perfectly matched layer (PML) efficiency in viscoelastic media, we firstly propose a split multi-axial PML (M-PML) and an unsplit convolutional PML (C-PML) in the second-order viscoelastic wave equations with the displacement as the only unknown. The advantage of these formulations is that it is easy and efficient to revise the existing codes of the second-order spectral element method (SEM) or finite element method (FEM) with absorbing boundaries in a uniform equation, as well as more economical than the auxiliary differential equations PML (ADEPML). Three models which are easily suffered from late time instabilities are considered to validate our approaches. Through comparison the M-PML with C-PML efficiency of absorption and stability for long time simulation, it can be concluded that: 1) For an isotropic viscoelastic medium with high Poisson's ratio, the C-PML will be a sufficient choice for long time simulation because of its weak reflections and superior stability; 2) Unlike the M-PML with high-order damping profile, the M-PML with 2nd-order damping profile loses its stability in long time simulation for an isotropic viscoelastic medium; 3) In an anisotropic viscoelastic medium, the C-PML suffers from instabilities, while the M-PML with 2nd-order damping profile can be a better choice for its superior stability and more acceptable weak reflections than the M-PML with high-order damping profile. The comparative analysis of the developed methods offers meaningful significance for long time seismic wave modeling in second-order viscoelastic wave equations.

  16. Two topics in nonperturbative lattice field theories: The U(1) quantum link model and perfect actions for scalar theories

    Science.gov (United States)

    Tsapalis, Antonios S.

    This thesis deals with two topics in lattice field theories. In the first part we discuss aspects of renormalization group flow and non-perturbative improvement of actions for scalar theories regularized on a lattice. We construct a perfect action, an action which is free of lattice artifacts, for a given theory. It is shown how a good approximation to the perfect action-referred to as classically perfect-can be constructed based on a well-defined blocking scheme for the O(3) non-linear σ-model. We study the O(N) non- linear σ-model in the large-N limit and derive analytically its perfect action. This action is applied to the O(3) model on a square lattice. The Wolff cluster algorithm is used to simulate numerically the system. We perform scaling tests and discuss the scaling properties of the large- N inspired perfect action as opposed to the standard and the classically perfect action. In the second part we present a new formulation for a quantum field theory with Abelian gauge symmetry. A Hamiltonian is constructed on a four-dimensional Euclidean space-time lattice which is invariant under local transformations. The model is formulated as a 5- dimensional path integral of discrete variables. We argue that dimensional reduction will allow us to study the behavior of the standard compact U(1) gauge theory in 4-d. Based on the idea of the loop- cluster algorithm for quantum spins, we present the construction of a flux-cluster algorithm for the U(1) quantum link model for the spin-1/2 quantization of the electric flux. It is shown how improved estimators for Wilson loop expectation values can be defined. This is important because the Wilson loops are traditionally used to identify confining and Coulomb phases in gauge theories. Our study indicates that the spin-1/2 U(1) quantum link model is strongly coupled for all bare coupling values we examined. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.)

  17. Application of Convolution Perfectly Matched Layer in MRTD scattering model for non-spherical aerosol particles and its performance analysis

    Science.gov (United States)

    Hu, Shuai; Gao, Taichang; Li, Hao; Yang, Bo; Jiang, Zidong; Liu, Lei; Chen, Ming

    2017-10-01

    The performance of absorbing boundary condition (ABC) is an important factor influencing the simulation accuracy of MRTD (Multi-Resolution Time-Domain) scattering model for non-spherical aerosol particles. To this end, the Convolution Perfectly Matched Layer (CPML), an excellent ABC in FDTD scheme, is generalized and applied to the MRTD scattering model developed by our team. In this model, the time domain is discretized by exponential differential scheme, and the discretization of space domain is implemented by Galerkin principle. To evaluate the performance of CPML, its simulation results are compared with those of BPML (Berenger's Perfectly Matched Layer) and ADE-PML (Perfectly Matched Layer with Auxiliary Differential Equation) for spherical and non-spherical particles, and their simulation errors are analyzed as well. The simulation results show that, for scattering phase matrices, the performance of CPML is better than that of BPML; the computational accuracy of CPML is comparable to that of ADE-PML on the whole, but at scattering angles where phase matrix elements fluctuate sharply, the performance of CPML is slightly better than that of ADE-PML. After orientation averaging process, the differences among the results of different ABCs are reduced to some extent. It also can be found that ABCs have a much weaker influence on integral scattering parameters (such as extinction and absorption efficiencies) than scattering phase matrices, this phenomenon can be explained by the error averaging process in the numerical volume integration.

  18. Bianchi type-I massive string magnetized barotropic perfect fluid cosmological model in bimetric theory

    Indian Academy of Sciences (India)

    S D Katore; R S Rane; K S Wankhade

    2011-04-01

    Bianchi type-I massive string cosmological model for perfect fluid distribution in the presence of magnetic field is investigated in Rosen’s [Gen. Relativ. Gravit. 4, 435 (1973)] bimetric theory of gravitation. To obtain the deterministic model in terms of cosmic time, we have used the condition $A = (B C)^n$, where n is a constant, between the metric potentials. The magnetic field is due to the electric current produced along the -axis with infinite electrical conductivity. Some physical and geometrical properties of the exhibited model are discussed and studied.

  19. Greek Monk Theodore as the first Primate of Canterbury

    Directory of Open Access Journals (Sweden)

    Ks. Warsonofiusz (Doroszkiewicz

    2014-11-01

    Full Text Available The theological climate of the young Church of Anglo-Saxon Christians was determined by Irish and Welsh monks maintaining the tradition of the Egyptian desert. The Angles and Saxons had a particular vision of the natural world, of the eternal world, a particular comprehension of sin and repentance. Rome in its missionary work used them to attach the British Christians the see of St Peter. Britain had no original link with the culture and tradition of the classical Church. It has been particularly established and enforced in VII and VIII, when England received a great dose of classical learning and theology due to the activity of archbishop of Canterbury Theodore and monk Hadrian. The formerly Greek monk Theodore – well learned in the Holy Scripture as well as Greek and Latin classics – was named the archbishop of Canterbury by pope Vitalian under the condition that he should notintroduce any typically Greek customs. Theodore named Hadrian the abbot of the Canterbury monastery of St Peter. There and in York young English could pursue classical studies of the Holy Scriptures, poetry, philosophy, mathematics, astronomy, etc. It resulted in significant literary development in Britain, of which venerable Bede is an example.Theodore introduced in Canterbury proto-byzantine canonical law, during two famous synods established doctrinal and ecclesiastical foundations of English Christianity based on ancient orthodox tradition of Eastern part of the Mediterranean region. At the Synod of Hatfield,with the other bishops, Theodore confirmed the Nicean Creed, fiveformer ecumenical councils and the generally accepted Church Fathers. They worked also on practical church unity, that is established: common date of Easter with other parts of Christian world, non-intervention ofbishops in other dioceses, canonical laws regulating the attitude of bishops towards monastic communities and the decrees against monophysismonks coming from Persia.

  20. Nucleation and mobility model of Agn clusters adsorbed on perfect and oxygen vacancy MgO surfaces.

    Science.gov (United States)

    Liu, Yongfei; Wang, Yan; Chen, Guangju

    2011-05-01

    The structures and energy properties for Ag(n) (n = 1-8) metal clusters adsorbed on the perfect and oxygen vacancy MgO surfaces have been studied by using the DFT/UB3LYP method with an embedded cluster model. The nucleation and mobility model for the Ag(n) (n = 1-8) clusters on the perfect and oxygen vacancy MgO(100) surfaces was investigated. The results show that the Ag atoms locate initially at the surface oxygen vacancy sites; then, with the growth of Ag cluster sizes, the large Ag clusters move possibly out of the vacancy sites by a rolling model, and diffuse on the MgO surface under a certain temperature condition. The relative energies needed for moving out of the oxygen vacancy region for the adsorbed Ag(n) clusters with the rolling model have been predicted. The even-odd oscillation behaviors for the cohesive energies, nucleation energies, first ionization potentials and HOMO-LUMO gaps of the adsorbed Ag(n) clusters with the variation of cluster sizes have also been discussed.

  1. Model-Checking an Alternating-time Temporal Logic with Knowledge, Imperfect Information, Perfect Recall and Communicating Coalitions

    Directory of Open Access Journals (Sweden)

    Cătălin Dima

    2010-06-01

    Full Text Available We present a variant of ATL with distributed knowledge operators based on a synchronous and perfect recall semantics. The coalition modalities in this logic are based on partial observation of the full history, and incorporate a form of cooperation between members of the coalition in which agents issue their actions based on the distributed knowledge, for that coalition, of the system history. We show that model-checking is decidable for this logic. The technique utilizes two variants of games with imperfect information and partially observable objectives, as well as a subset construction for identifying states whose histories are indistinguishable to the considered coalition.

  2. Perfect Omniscience, Perfect Secrecy and Steiner Tree Packing

    CERN Document Server

    Nitinawarat, Sirin

    2010-01-01

    We consider perfect secret key generation for a ``pairwise independent network'' model in which every pair of terminals share a random binary string, with the strings shared by distinct terminal pairs being mutually independent. The terminals are then allowed to communicate interactively over a public noiseless channel of unlimited capacity. All the terminals as well as an eavesdropper observe this communication. The objective is to generate a perfect secret key shared by a given set of terminals at the largest rate possible, and concealed from the eavesdropper. First, we show how the notion of perfect omniscience plays a central role in characterizing perfect secret key capacity. Second, a multigraph representation of the underlying secrecy model leads us to an efficient algorithm for perfect secret key generation based on maximal Steiner tree packing. This algorithm attains capacity when all the terminals seek to share a key, and, in general, attains at least half the capacity. Third, when a single ``helper...

  3. Hindlimb myology of the monk parakeet (Aves, Psittaciformes).

    Science.gov (United States)

    Carril, Julieta; Mosto, María C; Picasso, Mariana B J; Tambussi, Claudia P

    2014-07-01

    We studied the hindlimb myology of the monk parakeet (Myiopsitta monachus). Like all parrots, it has zygodactyl feet enabling perching, climbing, hanging, moving easily among trees, and handling food. Muscles were described and weighed, and physiological cross-sectional area (PCSA) of four flexors and one extensor was calculated. In comparison to other muscles, the M. tibialis cranialis and the M. fibularis brevis show increased development and high PCSA values, and therefore, large potential force production. Also, a large proportion of muscle mass was involved in flexing the digits. We hypothesize that these muscle traits are associated with the arboreal locomotion and food manipulation habits. In the monk parakeet, the M. extensor digitorum longus sends a branch to the hallux, and the connection between the M. flexor digitorum longus and the M. flexor hallucis longus is type I (Gadow's classification). We reaffirm the presence of the M. ambiens as a plesiomorphic condition that disappears in most members of the order. Among Psittaciformes, the M. fibularis brevis is stronger and the M. fibularis weaker in arboreal species than in basal terrestrial ones (e.g., Strigops). © 2014 Wiley Periodicals, Inc.

  4. A second-order, perfectly matched layer formulation to model 3D transient wave propagation in anisotropic elastic media

    CERN Document Server

    Assi, Hisham

    2016-01-01

    Numerical simulation of wave propagation in an infinite medium is made possible by surrounding a finite region by a perfectly matched layer (PML). Using this approach a generalized three-dimensional (3D) formulation is proposed for time-domain modeling of elastic wave propagation in an unbounded lossless anisotropic medium. The formulation is based on a second-order approach that has the advantages of, physical relationship to the underlying equations, and amenability to be implemented in common numerical schemes. Specifically, our formulation uses three second-order equations of the displacement field and nine auxiliary equations, along with the three time histories of the displacement field. The properties of the PML, which are controlled by a complex two-parameter stretch function, are such that it acts as near perfect absorber. Using finite element method (FEM) 3D numerical results are presented for a highly anisotropic medium. An extension of the formulation to the particular case of a Kelvin-Vogit visco...

  5. The Epistle of Cornelius, a Monk of the Snetogorsky Monastery

    Directory of Open Access Journals (Sweden)

    Valentina I. Okhotnikova

    2015-08-01

    Full Text Available This article deals with the problem of the dating and authorship of the Epistle of Cornelius, a monk of the Snetogorsky monastery, to his spiritual son, the priest Ivan, who decided to marry for a second time “for childbearing.” Nikolai I. Serebriansky dated the Epistle to the 1590s (this dating also was shared by subsequent researchers, based on the assertion that during the life of Ivan the Terrible, Cornelius would hardly have dared to write that tsars who violate the laws of the Church regarding the termination and conclusion of a second marriage would be punished by the birth of an heir who “will trample everything and will be an initiator of every evil deed.” The identification of the sources describing both the heir’s evil deeds and other parts of the text allows us to refine the dating of the Epistle. Cornelius finds arguments for the condemnation of his spiritual son’s decision to remarry not only in Scripture but also in contemporary hagiographic and publicistic works that date back to a period of time from the beginning of the 16th century to the 1540s: the Life of Euphrosynus of Pskov (the Story about Halleluiah, no later than 1510; the Epistle of Maximus the Greek to Fedor Karpov about Leviathan, dated between 1518 and 1525; the Epistle of Mark, patriarch of Jerusalem (from the Excerpt about the Second Marriage of Grand Prince Vasily III, from the 1540s. Such a concentration of works from a specific period of time suggests that the Epistle of Cornelius itself was written at about the same time. Most likely, the Cornelius who is identified as the author of the Epistle is the Cornelius listed as the former abbot of the Snetogorsky monastery in the 1562 record inscribed in the Gospel manuscript from the collection of the Russian State Library, f. 205, No. 29. Monk Cornelius could have written the Epistle no earlier than in 1525 and no later than in 1562, when he was no longer either a monk or the abbot of the Snetogorsky

  6. Perfect Derived Propagators

    CERN Document Server

    Schulte, Christian

    2008-01-01

    When implementing a propagator for a constraint, one must decide about variants: When implementing min, should one also implement max? Should one implement linear equations both with and without coefficients? Constraint variants are ubiquitous: implementing them requires considerable (if not prohibitive) effort and decreases maintainability, but will deliver better performance. This paper shows how to use variable views, previously introduced for an implementation architecture, to derive perfect propagator variants. A model for views and derived propagators is introduced. Derived propagators are proved to be indeed perfect in that they inherit essential properties such as correctness and domain and bounds consistency. Techniques for systematically deriving propagators such as transformation, generalization, specialization, and channeling are developed for several variable domains. We evaluate the massive impact of derived propagators. Without derived propagators, Gecode would require 140000 rather than 40000 ...

  7. An Elastic-plastic Adhesion Model for Contacting Fractal Rough Surface and Perfectly Wetted Plane with Meniscus

    Institute of Scientific and Technical Information of China (English)

    PENG Yunfeng; GUO Yinbiao

    2009-01-01

    The strong stiction of adjacent surfaces with meniscus is a major design concern in the devices with a micro-sized interface.Today, more and more research works are devoted to understand the adhesion mechanism. This paper concerns the elastic-plastic adhesion of a fractal rough surface contacting with a perfectly wetted rigid plane. The topography of rough surface is modeled with a two-variable Weierstrass-Mandelbrot fractal function. The Laplace pressure is dealt with the Dugdale approximation. Then the adhesion model of the plastically deformed asperities with meniscus can be established with the fractal microcontact model. According to the plastic flow criterion, the elastic-plastic adhesion model of the contacting rough surfaces with meniscus can be solved by combining the Maugis-Dugdale (MD) model and its extension with the Morrow method. The necessity for considering the asperities' plastic deformation has been validated by comparing the simulation result of the presented model with that of the elastic adhesion model. The stiction mechanism of rough surfaces with meniscus is also discussed.

  8. Facebook as a monastic place? The new use of internet by Catholic monks

    Directory of Open Access Journals (Sweden)

    Isabelle Jonveaux

    2013-01-01

    Full Text Available Although Catholic monasteries are theoretically out of the world, monks and nuns more and more use the internet, both for religious and non-religious reasons. While society at large often takes it for granted that monks are out of modernity, monastic communities have been adopted media from relatively early on, and we cannot say that they have come late to its use. The internet can offer monasteries a lot of advantages because it allows monks to be in the world without going out of the cloister. Nevertheless, the introduction of this new media in monasteries also raises a lot of questions about the potential contradictions it poses with other aspects of monastic life. The paper seeks to research the use of the medium by monks and nuns even in their daily lives, and attempts especially to investigate the potential changes it brings to monastic life.

  9. HMSRP Observation of Hawaiian monk seal behavioral interactions - Oahu and Laysan Island, 2015

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Infectious disease has the potential to pose serious risk to Hawaiian Monk Seal populations. HMSRP is currently researching and evaluating methods to minimize...

  10. HMSRP Hawaiian Monk Seal Shark Predation Mitigation Shark Sightings and Incidents

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Data on direct sightings of large sharks around monk seal pupping sites and shark incidents on preweaned and newly weaned pups at French Frigate Shoals are entered...

  11. HMSRP Hawaiian Monk Seal Contaminants (Blubber, serum, and whole blood persistent organic pollutants) Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains information on persistent organic pollutant analysis of Hawaiian monk seal whole blood and blubber samples from the northwestern Hawaiian...

  12. Sense of Coherence (SOC) in Christian Orthodox Monks and Nuns in Greece.

    Science.gov (United States)

    Merakou, Kyriakoula; Taki, Stavroula; Barbouni, Anastasia; Antoniadou, Eleni; Theodoridis, Dimitrios; Karageorgos, Georgios; Kourea-Kremastinou, Jeny

    2017-04-01

    This paper aims to investigate the stress management skills of Christian Orthodox monks and nuns, as measured by Antonovsky's scale sense of coherence (SOC). A case-control study was designed to test the hypotheses whether monks and nuns have higher SOC than secular people. The study population consisted of 193 individuals, 96 monks and nuns (study group) and 97 secular men and women (control group). SOC score was higher in monks and nuns as compared to the secular population (p = 0.002), men as compared to women (p = 0.012) and persons of older age (p = 0.004) as compared to younger individuals.

  13. A family of anisotropic super-dense star models using a space-time describing charged perfect fluid distributions

    Science.gov (United States)

    Maurya, S. K.; Gupta, Y. K.

    2012-08-01

    A family of anisotropic fluid distributions is constructed using a space-time describing a family of charged perfect fluid distributions. The anisotropy parameter is taken to be twice the square of electric intensity used in the charged fluid distributions. As the anisotropy parameter (or the electric intensity) is zero at the centre and is monotonically increasing towards the pressure-free interface, we have utilized the anisotropic fluid distributions to create Boson-type neutron stars models which join smoothly to the Schwarzschild exterior metric. All the physical entities such as energy density, radial pressure, tangential pressure and velocity of sound are monotonically decreasing towards the surface. Different members of the above family are characterized by a positive integral number n. It is observed that the maximum mass (which is 5.8051 solar mass for n = 4) starts decreasing for n > 4. But this reaches a non-zero terminal value (2.8010 solar mass) as n tends to infinity.

  14. Monje y soldado. La imagen masculina durante el Franquismo. Monk and soldier. The masculine image during the Franco regime.

    Directory of Open Access Journals (Sweden)

    González Aja, Teresa

    2005-10-01

    Full Text Available ResumenTras la Guerra Civil, en España se establece un nuevo régimen, que tiene como eje central la figura de Franco. Dentro de la imagen que el franquismo quiso dar, jugó un importante papel, al igual que en todos los regímenes totalitarios, la imagen id alizada del hombre. Se hará una defensa de mito del hombre perfecto, que incluye lo corporal, aunque siempre estará más próximo a la imagen del caballero perfecto, del "monje-soldado", hecho de austeridad, de espíritu de sacrificio, pero también de impasibilidad ante la sangre vertida, que al modelo corporal desarrollado en el fascismo italiano y en el nazismo alemán. El deporte se deja en manos de un nuevo organismo que iba a ser una delegación o agencia de la Secretaría General del Movimiento Nacional, el único partido político permitido y una incómoda alianza de falangistas, monárquicos y carlistas. Su misión era usar el ámbito deportivo internacional para una exhibición de la virilidad y la furia españolas, lo mismo que habían hecho los regímenes alemán e italiano en la década de 1930-40. Se descartó, por tanto, desde el principio, toda posibilidad de que el deporte pudiera tener cierto grado de independencia respecto al nuevo poder político. En consecuencia hablar del culto al cuerpo, de deporte, durante el periodo franquista, resulta hablar de la adaptación de distintos modelos a distintas etapas y a las necesidades de un personaje muy concreto.AbstractAfter the Civil War, in Spain a new regime turns up. Franc was the central figure of that new situation. The Francoism wanted to give an idealizada image of the man, like in all the totalitarian regimes. A defense of myth of the perfect man will become, which included his physical appearence, although it would always be nearer the image of the perfect gentelman, of the "soldier-monk ", a compound of austerity, spirit of sacrifice, an impassiveness when faced with bloodshed, that to the developed corporal model in

  15. Practice Makes Perfect? The Role of Participant Modeling in Sexual Abuse Prevention Programs.

    Science.gov (United States)

    Wurtele, Sandy K.; And Others

    1987-01-01

    Assigned 26 kindergarten children to either a sexual abuse prevention program which taught self-protective skills through modeling and active rehearsal (PM) or a program which taught the same skills by having children watch skills modeled by experimenter (SM). Results provide support for greater efficacy of PM relative to SM for learning of…

  16. Lattice Boltzmann model for the perfect gas flows with near-vacuum region

    Institute of Scientific and Technical Information of China (English)

    GuangwuYAN; LiYUAN

    2000-01-01

    It is known that the standard lattice Boltzmann method has near-vacuum limit,i. e., when the density is near zero, this method is invalid. In this letter, we propose a simple lattice Boltzmann model for one-dimensional flows. It possesses the ability of simulating nearvacuum area by setting a limitation of the relaxation factor. Thus, the model overcomes the disadvantage of non-physical pressure and the density. The numerical examples show these results are satisfactory.

  17. From many body wee partons dynamics to perfect fluid: a standard model for heavy ion collisions

    Energy Technology Data Exchange (ETDEWEB)

    Venugopalan, R.

    2010-07-22

    We discuss a standard model of heavy ion collisions that has emerged both from experimental results of the RHIC program and associated theoretical developments. We comment briefly on the impact of early results of the LHC program on this picture. We consider how this standard model of heavy ion collisions could be solidified or falsified in future experiments at RHIC, the LHC and a future Electro-Ion Collider.

  18. Perfect and Quasi-Perfect Lattice Actions

    CERN Document Server

    Bietenholz, W

    1998-01-01

    Perfect lattice actions are exiting with several respects: they provide new insight into conceptual questions of the lattice regularization, and quasi-perfect actions could enable a great leap forward in the non-perturbative solution of QCD. We try to transmit a flavor of them, also beyond the lattice community.

  19. Bianchi type-V cosmological models with perfect fluid and heat flow in Saez–Ballester theory

    Indian Academy of Sciences (India)

    Shri Ram; M Zeyauddin; C P Singh

    2009-02-01

    In this paper we discuss the variation law for Hubble's parameter with average scale factor in a spatially homogeneous and anisotropic Bianchi type-V space-time model, which yields constant value of the deceleration parameter. We derive two laws of variation of the average scale factor with cosmic time, one is of power-law type and the other is of exponential form. Exact solutions of Einstein field equations with perfect fluid and heat conduction are obtained for Bianchi type-V space-time in these two types of cosmologies. In the cosmology with the power-law, the solutions correspond to a cosmological model which starts expanding from the singular state with positive deceleration parameter. In the case of exponential cosmology, we present an accelerating non-singular model of the Universe. We find that the constant value of deceleration parameter is reasonable for the present day Universe and gives an appropriate description of evolution of Universe. We have also discussed different types of physical and kinematical behaviour of the models in these two types of cosmologies.

  20. Assessing performance and seasonal bias of pollen-based climate reconstructions in a perfect model world

    Science.gov (United States)

    Rehfeld, Kira; Trachsel, Mathias; Telford, Richard J.; Laepple, Thomas

    2016-12-01

    Reconstructions of summer, winter or annual mean temperatures based on the species composition of bio-indicators such as pollen, foraminifera or chironomids are routinely used in climate model-proxy data comparison studies. Most reconstruction algorithms exploit the joint distribution of modern spatial climate and species distribution for the development of the reconstructions. They rely on the space-for-time substitution and the specific assumption that environmental variables other than those reconstructed are not important or that their relationship with the reconstructed variable(s) should be the same in the past as in the modern spatial calibration dataset. Here we test the implications of this "correlative uniformitarianism" assumption on climate reconstructions in an ideal model world, in which climate and vegetation are known at all times. The alternate reality is a climate simulation of the last 6000 years with dynamic vegetation. Transient changes of plant functional types are considered as surrogate pollen counts and allow us to establish, apply and evaluate transfer functions in the modeled world. We find that in our model experiments the transfer function cross validation r2 is of limited use to identify reconstructible climate variables, as it only relies on the modern spatial climate-vegetation relationship. However, ordination approaches that assess the amount of fossil vegetation variance explained by the reconstructions are promising. We furthermore show that correlations between climate variables in the modern climate-vegetation relationship are systematically extended into the reconstructions. Summer temperatures, the most prominent driving variable for modeled vegetation change in the Northern Hemisphere, are accurately reconstructed. However, the amplitude of the model winter and mean annual temperature cooling between the mid-Holocene and present day is overestimated and similar to the summer trend in magnitude. This effect occurs because

  1. Finite Size Scaling and "perfect" actions the three dimensional Ising model

    CERN Document Server

    Ballesteros, H G; Martín-Mayor, V; Muñoz-Sudupe, A

    1998-01-01

    Using Finite-Size Scaling techniques, we numerically show that the first irrelevant operator of the lattice $\\lambda\\phi^4$ theory in three dimensions is (within errors) completely decoupled at $\\lambda=1.0$. This interesting result also holds in the Thermodynamical Limit, where the renormalized coupling constant shows an extraordinary reduction of the scaling-corrections when compared with the Ising model. It is argued that Finite-Size Scaling analysis can be a competitive method for finding improved actions.

  2. OKUMURA-HATA: A PERFECT MODEL FOR DRIVING ROUTE UHF INVESTIGATION

    Directory of Open Access Journals (Sweden)

    Omohimire P. Omolaye

    2015-09-01

    Full Text Available In today’s competitive world, a successful utility must take maximum advantage of its resources, from people to equipment to information. Using GIS on RF to integrate geographic with other corporate data has become absolutely vital to this task. The truthfulness and understandability of information is dependent upon the way it is presented. Urban planner, biologist, geologist, hydrological engineer and RF engineer tend to discuss some common factor of interest by having a better understanding of their environment (the geographic space of their study area. All these professionals work with data that relates to space. Most precisely, they deal with questions related to geographic space, which might informally be characterized as having positioned data to the earth’s surface. In this paper, we investigate and predict best model suitable for driving route of UHF wave propagation in Ondo state, Nigeria by comparing measured values using GIS equipment with the empirical results.

  3. They made you perfect: A test of the Social Reaction Model of Perfectionism.

    Science.gov (United States)

    Wilson, Claire; Hunter, Simon C; Rasmussen, Susan; McGowan, Allison

    2015-01-01

    Perfectionism serves as a mediator in the relationship between difficult life experiences and psychological distress, but to date no research has examined the effect of recalled peer victimization on perfectionism and adult depressive symptomatology (DS). The present study assessed the Social Reaction Model of Perfectionism (SRMP; Flett, Hewitt, Oliver, & Macdonald (2002b). Perfectionism in children and their parents: A developmental analysis. In G. L. Flett and P. L. Hewitt (Eds.), Perfectionism: Theory, research, and treatment (pp. 89-132). Washington: American Psychological Association), which proposes that perfectionism (self-oriented, other-oriented and socially prescribed perfectionism) results from harsh experiences. This may include experiences of peer victimization (physical, verbal and indirect). The model was extended to also include adult DS and rumination (brooding and reflection). Self-report questionnaires measuring recalled childhood experiences of peer victimization (Owens, Daly, & Slee (2005). Aggressive Behavior, 31, 1-12. doi: 10.1002/ab.20045), current trait perfectionism (Hewitt & Flett (1991). Journal of Personality and Social Psychology, 60, 456-470. http://dx.doi.org/10.1037//0022-3514.60.3.456), rumination (Nolen-Hoeksema & Morrow (1991). Journal of Personality and Social Psychology, 61, 115-121. doi: 10.1037/0022-3514.61.1.115) and DS (Radloff (1977). Applied Psychological Measurement, 1, 386-401. http://dx.doi.org/10.1177/014662167700100306) were completed by 338 adult participants (54% female). Path-analyses revealed recalled indirect victimization to be associated with adults' self-oriented and socially prescribed perfectionism. However, only socially prescribed perfectionism mediated the relation between recalled indirect victimization and adult DS. Brooding rumination also mediated the effect of socially prescribed perfectionism upon DS. The findings support the SRMP, and extend the theory to include the effects of perfectionism on

  4. Response to a periodic stimulus in a perfect integrate-and-fire neuron model driven by colored noise

    Science.gov (United States)

    Mankin, Romi; Rekker, Astrid

    2016-12-01

    The output interspike interval statistics of a stochastic perfect integrate-and-fire neuron model driven by an additive exogenous periodic stimulus is considered. The effect of temporally correlated random activity of synaptic inputs is modeled by an additive symmetric dichotomous noise. Using a first-passage-time formulation, exact expressions for the output interspike interval density and for the serial correlation coefficient are derived in the nonsteady regime, and their dependence on input parameters (e.g., the noise correlation time and amplitude as well as the frequency of an input current) is analyzed. It is shown that an interplay of a periodic forcing and colored noise can cause a variety of nonequilibrium cooperation effects, such as sign reversals of the interspike interval correlations versus noise-switching rate as well as versus the frequency of periodic forcing, a power-law-like decay of oscillations of the serial correlation coefficients in the long-lag limit, amplification of the output signal modulation in the instantaneous firing rate of the neural response, etc. The features of spike statistics in the limits of slow and fast noises are also discussed.

  5. Growth curves and their implications in hand-fed Monk parrots (Myiopsitta monachus

    Directory of Open Access Journals (Sweden)

    Petzinger C

    2015-10-01

    Full Text Available Christina Petzinger,1,2 J Jill Heatley,3 John E Bauer1,2 1Comparative Animal Nutrition Research Laboratory, Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, 2Intercollegiate Faculty of Nutrition, Texas A&M University, 3Zoological Medicine Service, Department of Small Animal Medicine and Surgery, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, USA Abstract: Monk parrots (Myiopsitta monachus were hand-fed over two chick seasons spanning of 2010 to 2011. Information from the growth curve of chicks hand-fed in 2010 was used to develop a feeding protocol for the 2011 season (Protocol-2011. This protocol addressed the problems of delayed followed by excessive growth experienced by parrots hand fed in 2010. Monk parrots that were hand-fed in 2011 following the new protocol experienced delayed growth after 20 days of age. However, some Monk parrots were fed in excess of Protocol-2011 and did not experience a major delay in growth. The energy requirement equations used to construct Protocol-2011 were low when compared to adult Monk parrot maintenance energy requirements. The data suggest that growing birds do not require approximately twice their adult maintenance energy requirements, as is the case for growing dogs. Additionally, there appear to be fluctuations in energy needs as Monk parrots grow. A major increase in energy needs occurred between days 18 and 23 posthatching, which corresponds to feather development and growth in Monk parrot chicks. Thus, multiple equations estimating energy requirements, rather than just one equation, are likely needed from hatching to fledging in order to ensure adequate energy is provided to chicks. More research on the energy requirements of growing Monk parrots, especially around the time of fledging and weaning, is needed to improve hand-fed methods and potentially the adult health of hand-fed birds. Keywords

  6. MAP Estimation, Message Passing, and Perfect Graphs

    CERN Document Server

    Jebara, Tony S

    2012-01-01

    Efficiently finding the maximum a posteriori (MAP) configuration of a graphical model is an important problem which is often implemented using message passing algorithms. The optimality of such algorithms is only well established for singly-connected graphs and other limited settings. This article extends the set of graphs where MAP estimation is in P and where message passing recovers the exact solution to so-called perfect graphs. This result leverages recent progress in defining perfect graphs (the strong perfect graph theorem), linear programming relaxations of MAP estimation and recent convergent message passing schemes. The article converts graphical models into nand Markov random fields which are straightforward to relax into linear programs. Therein, integrality can be established in general by testing for graph perfection. This perfection test is performed efficiently using a polynomial time algorithm. Alternatively, known decomposition tools from perfect graph theory may be used to prove perfection ...

  7. Perfect and imperfect states

    Directory of Open Access Journals (Sweden)

    Nikitović Aleksandar

    2013-01-01

    Full Text Available Early Greek ethics embodied in Cretan and Spartan mores, served as a model for Plato`s political theory. Plato theorized the contents of early Greek ethics, aspiring to justify and revitalize the fundamental principles of a traditional view of the world. However, according to Plato`s new insight, deed is further from the truth than a thought i.e. theory. The dorian model had to renounce its position to the perfect prototype of a righteous state, which is a result of the inner logic of philosophical theorizing in early Greek ethics. Prototype and model of philosophical reflection, in comparison to philosophical theory, becomes minor and deficient. Philosophical theorizing of early Greek ethics philosophically formatted Greek heritage, initiating substantial changes to the content of traditional ethics. Replacement of the myth with ontology, as a new foundation of politics, transformed early Greek ethics in various relevant ways. [Projekat Ministarstva nauke Republike Srbije, br. 179049

  8. Temperature regulation and water requirements of the monk parakeet, Myiopsitta monachus.

    Science.gov (United States)

    Weathers, Wesley W; Caccamise, Donald F

    1975-12-01

    Monk parakeets have been introduced into North America within the past 15 years and are apparently becoming established in several geographical regions. Several physiological responses of monk parakeets related to climatic tolerance were examined, and it is concluded that the species is equipped physiologically to occupy most climatic situations with the exception of arctic and subarctic regions and waterless deserts. The standard metabolic rate, determined during the winter, was 44% lower at night (1.17 ml O2 g(-1) hr(-1)) than during the day (1.68 ml O2 g(-1) hr(-1)). Monk parakeets are relatively tolerant of low air temperature (Ta) and showed no signs of hypothermia at Ta's as low as-8°C. The birds were unable to maintain body weight on a diet of air-dried seeds without supplemental water. Monk parakeets possess excellent capabilities for increasing evaporative water loss at high Ta's, being able to dissipate up to 153% of their metabolic heat production at 44°C. This species responds to high Ta's with open-mouthed panting. During panting the thick, moist tongue is raised and lowered in synchrony with the thorax. Thus, monk parakeets may employ lingual flutter to augment evaporative cooling; a mechanism analogous to the gular flutter of other nonpasserine birds.

  9. Vocal tract articulation revisited: the case of the monk parakeet.

    Science.gov (United States)

    Ohms, Verena R; Beckers, Gabriël J L; ten Cate, Carel; Suthers, Roderick A

    2012-01-01

    Birdsong and human speech share many features with respect to vocal learning and development. However, the vocal production mechanisms have long been considered to be distinct. The vocal organ of songbirds is more complex than the human larynx, leading to the hypothesis that vocal variation in birdsong originates mainly at the sound source, while in humans it is primarily due to vocal tract filtering. However, several recent studies have indicated the importance of vocal tract articulators such as the beak and oropharyngeal-esophageal cavity. In contrast to most other bird groups, parrots have a prominent tongue, raising the possibility that tongue movements may also be of significant importance in vocal production in parrots, but evidence is rare and observations often anecdotal. In the current study we used X-ray cinematographic imaging of naturally vocalizing monk parakeets (Myiopsitta monachus) to assess which articulators are possibly involved in vocal tract filtering in this species. We observed prominent tongue height changes, beak opening movements and tracheal length changes, which suggests that all of these components play an important role in modulating vocal tract resonance. Moreover, the observation of tracheal shortening as a vocal articulator in live birds has to our knowledge not been described before. We also found strong positive correlations between beak opening and amplitude as well as changes in tongue height and amplitude in several types of vocalization. Our results suggest considerable differences between parrot and songbird vocal production while at the same time the parrot's vocal articulation might more closely resemble human speech production in the sense that both make extensive use of the tongue as a vocal articulator.

  10. Antiproliferative Activity of Triterpene Glycoside Nutrient from Monk Fruit in Colorectal Cancer and Throat Cancer

    Directory of Open Access Journals (Sweden)

    Can Liu

    2016-06-01

    Full Text Available Colorectal cancer and throat cancer are the world’s most prevalent neoplastic diseases, and a serious threat to human health. Plant triterpene glycosides have demonstrated antitumor activity. In this study, we investigated potential anticancer effects of mogroside IVe, a triterpenoid glycoside from monk fruit, using in vitro and in vivo models of colorectal and laryngeal cancer. The effects of mogroside IVe on the proliferation of colorectal cancer HT29 cells and throat cancer Hep-2 cells were determined by 3-(4,5-dimethylthiazol-2-yl-2,5-diphenyltetrazolium bromide (MTT assay, and the expression levels of p53, phosphorylated ERK1/2, and MMP-9 were analyzed by western blotting and immunohistochemistry. The results indicated that mogroside IVe inhibited, in a dose-dependent manner, the proliferation of HT29 and Hep-2 cells in culture and in xenografted mice, which was accompanied by the upregulation of tumor suppressor p53, and downregulation of matrix metallopeptidase 9 (MMP-9 and phosphorylated extracellular signal-regulated kinases (ERK1/2. This study revealed the suppressive activity of mogroside IVe towards colorectal and throat cancers and identified the underlying mechanisms, suggesting that mogroside IVe may be potentially used as a biologically-active phytochemical supplement for treating colorectal and throat cancers.

  11. Antiproliferative Activity of Triterpene Glycoside Nutrient from Monk Fruit in Colorectal Cancer and Throat Cancer.

    Science.gov (United States)

    Liu, Can; Dai, Longhai; Liu, Yueping; Rong, Long; Dou, Dequan; Sun, Yuanxia; Ma, Lanqing

    2016-06-13

    Colorectal cancer and throat cancer are the world's most prevalent neoplastic diseases, and a serious threat to human health. Plant triterpene glycosides have demonstrated antitumor activity. In this study, we investigated potential anticancer effects of mogroside IVe, a triterpenoid glycoside from monk fruit, using in vitro and in vivo models of colorectal and laryngeal cancer. The effects of mogroside IVe on the proliferation of colorectal cancer HT29 cells and throat cancer Hep-2 cells were determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, and the expression levels of p53, phosphorylated ERK1/2, and MMP-9 were analyzed by western blotting and immunohistochemistry. The results indicated that mogroside IVe inhibited, in a dose-dependent manner, the proliferation of HT29 and Hep-2 cells in culture and in xenografted mice, which was accompanied by the upregulation of tumor suppressor p53, and downregulation of matrix metallopeptidase 9 (MMP-9) and phosphorylated extracellular signal-regulated kinases (ERK)1/2. This study revealed the suppressive activity of mogroside IVe towards colorectal and throat cancers and identified the underlying mechanisms, suggesting that mogroside IVe may be potentially used as a biologically-active phytochemical supplement for treating colorectal and throat cancers.

  12. PERFECT [CHINA] CO., LTD.

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ Funded by Perfect Resources (M) Sdn Bhd, Perfect (China) Co., Ltd.was incorporated in 1994 with business anchoring in research pioneering, advanced research and development, productions, sales and marketing and services in a grand scale, modern enterprise group. Today Perfect (China) Co., Ltd.'s wide range of consumer products has created a niche market for health food, personal care, household and beauty & skin care products.

  13. Seeing Perfectly Fitting Factor Models That Are Causally Misspecified: Understanding That Close-Fitting Models Can Be Worse

    Science.gov (United States)

    Hayduk, Leslie

    2014-01-01

    Researchers using factor analysis tend to dismiss the significant ill fit of factor models by presuming that if their factor model is close-to-fitting, it is probably close to being properly causally specified. Close fit may indeed result from a model being close to properly causally specified, but close-fitting factor models can also be seriously…

  14. Seeing Perfectly Fitting Factor Models That Are Causally Misspecified: Understanding That Close-Fitting Models Can Be Worse

    Science.gov (United States)

    Hayduk, Leslie

    2014-01-01

    Researchers using factor analysis tend to dismiss the significant ill fit of factor models by presuming that if their factor model is close-to-fitting, it is probably close to being properly causally specified. Close fit may indeed result from a model being close to properly causally specified, but close-fitting factor models can also be seriously…

  15. Never Perfect Enough

    Science.gov (United States)

    Landphair, Juliette

    2007-01-01

    What exactly is perfect? Students describe perfection as a combination of characteristics valued by their peer culture: intelligence, thin and fit physical appearance, social poise. As students chug through their daily lives--morning classes, organization meetings, club sports practice or the gym, dinner, another class, more meetings, library,…

  16. A Perfect Day

    Institute of Scientific and Technical Information of China (English)

    DOREMICHELUT

    2004-01-01

    THERE are days where not a thing goes wrong. There's not a glitch. Everything you expect happens, and then more comes along, not because you ask, but because it just does. It's the way life is supposed to be when life is perfect. Memory is what names that day perfect and analyzes it in order to create another, just like it.

  17. Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology

    Directory of Open Access Journals (Sweden)

    Dirk-Martin Scheel

    2014-05-01

    Full Text Available Extinctions and declines of large marine vertebrates have major ecological impacts and are of critical concern in marine environments. The Caribbean monk seal, Monachus tropicalis, last definitively reported in 1952, was one of the few marine mammal species to become extinct in historical times. Despite its importance for understanding the evolutionary biogeography of southern phocids, the relationships of M.tropicalis to the two living species of critically endangered monk seals have not been resolved. In this study we present the first molecular data for M. tropicalis, derived from museum skins. Phylogenetic analysis of cytochrome b sequences indicates that M. tropicalis was more closely related to the Hawaiian rather than the Mediterranean monk seal. Divergence time estimation implicates the formation of the Panamanian Isthmus in the speciation of Caribbean and Hawaiian monk seals. Molecular, morphological and temporal divergence between the Mediterranean and “New World monk seals” (Hawaiian and Caribbean is profound, equivalent to or greater than between sister genera of phocids. As a result, we classify the Caribbean and Hawaiian monk seals together in a newly erected genus, Neomonachus. The two genera of extant monk seals (Monachus and Neomonachus represent old evolutionary lineages each represented by a single critically endangered species, both warranting continuing and concerted conservation attention and investment if they are to avoid the fate of their Caribbean relative.

  18. [Differences in risk factors for disease and health problems between monks and the general population in The Netherlands].

    Science.gov (United States)

    van Meel, D; de Vrij, J H; Kunst, A E; Mackenbach, J P

    1992-08-08

    The aim of this study was to determine whether the austerely living Trappist and Benedictine monks have a lower prevalence of a number of risk factors and health problems than the general Dutch population. A written questionnaire was submitted to monks of 7 monasteries. The response was 67 per cent (134 monks). The data were compared with data from the national Health Interview Survey of 1989, which used an almost identical questionnaire. Adjustment was made for differences in age and education. Monks consume less alcohol and tobacco and have a more austere diet. Their average Quetelet index is lower. The prevalence of cardiovascular disease is lower. On the other hand, monks more often report a number of other chronic diseases, physical complaints, and problems with activities of daily life. They more often have contact with general practitioners and with consultants. The lower prevalence of a number of risk factors among monks reflects their austere way of life. It is not certain whether the lower prevalence of cardiovascular diseases can be attributed to this way of life. The fact that, in general, health problems are more prevalent among monks suggests that changes in lifestyle do not necessarily lead to compression of morbidity.

  19. Oral hygiene and periodontal status among Terapanthi Svetambar Jain monks in India

    Directory of Open Access Journals (Sweden)

    Manish Jain

    2009-12-01

    Full Text Available The main objective of the study was to determine the oral hygiene levels and periodontal status among Jain monks attending a Chaturmass in Udaipur, India. To date, no study has been conducted on Jain monks. The study comprises of 180 subjects and the overall response rate was 76% among them. Oral hygiene status was assessed by the Simplified Oral Hygiene Index (OHI-S of Greene, Vermillion14 (1964, and periodontal status was assessed by the Community Periodontal Index. Additional information was collected regarding food habits, education level and oral hygiene habits. Analysis of variance (ANOVA, Chi Square Test and Step-wise multiple linear regression analysis were carried out using SPSS Software (11.0. The results showed that the oral hygiene status of Jain monks was poor and only 5.6% of the subjects had good oral hygiene. Overall periodontal disease prevalence was 100% with bleeding and shallow pocket contributing a major part (72.8% among all the age groups (p < 0.001. Multiple linear regression analysis revealed that oral hygiene habits, caloric intake and education level explained a variance of 11.7% for the Oral hygiene index collectively. The findings confirmed that Jain monks have poor oral hygiene and an increased prevalence of periodontal disease compared to that of the similarly aged general population because, as a part of their religion, many Jain individuals avoid brushing their teeth especially during fasting, keeping in mind not to harm the microorganisms present in the mouth.

  20. Development of the Superaltricial Monk Parakeet (Aves, Psittaciformes): Embryo Staging, Growth, and Heterochronies.

    Science.gov (United States)

    Carril, Julieta; Tambussi, Claudia P

    2015-11-01

    Knowledge about the embryonic stages of birds is important in answering many questions about development and evolution. We give the first description of 41 embryological stages of the monk parakeet (Myiopsitta monachus) on the basis of external morphology and comparison with the chicken. We also provide measurements of some external morphological characters (i.e. body mass, crown-rump, beak, forelimb, and third toe lengths) and perform comparisons with other precocial and altricial birds with the aim of identifying heterochronous developmental features. The following differences in the development of characters in the monk parakeet when compared with other birds were found: (1) delay of the feathers primordia, (2) wing buds initially greater than leg buds, (3) forelimbs and hindlimbs with similar relative size, (4) retroversion of the toe IV, (5) ventral curvature of the upper jaw, (6) positive regressions between stages and beak length with acceleration and higher values and III toe lengths with deceleration and lower values in the monk parakeet compared to the chicken. The growth pattern of the monk paraket Myiopsitta monachus could be influenced by some heterochronic processes like post-displacement, acceleration and/or deceleration. Results of this research allow the standard identification of stages in different species of parrots, recognize similarities and differences between precocial (the chicken) and altricial species (Myiopsitta), and provide planning data for future studies. © 2015 Wiley Periodicals, Inc.

  1. PERFECT DEMAND ILLUSION

    Directory of Open Access Journals (Sweden)

    Alexander Yu. Sulimov

    2015-01-01

    Full Text Available The article is devoted to technique «Perfect demand illusion», which allows to strengthen the competitive advantageof retailers. Also in the paper spells out the golden rules of visual merchandising.The definition of the method «Demand illusion», formulated the conditions of its functioning, and is determined by the mainhypothesis of the existence of this method.Furthermore, given the definition of the «Perfect demand illusion», and describes its additional conditions. Also spells out the advantages of the «Perfect demandillusion», before the «Demand illusion».

  2. 利用Box样条构造完全重构模型的研究%Research of Constructing a Perfect Reconstruction Model Using Box Spline

    Institute of Scientific and Technical Information of China (English)

    袁晓君; 李华

    2001-01-01

    This paper presents a method to combine so\\|called multiband DFT filter bank with bivariate Box splines to construct a perfect reconstruction model for image processing. Based on the theory of B\\|splines, which are useful tool in many fields, Box Spline is said to be an extension, with the aim at describing multi\\|variate functions. In this paper, firstly, it introduces the DFT filter bank, and presents the condition to form a perfect reconstruct model. Then it describes bivariate Box splines and its some properties in little more details. It especially presents a particular class of bivariate Box splines, and use it to construct a decomposition/reconstruction model, which may be candidates for some kinds of task in image processing. This model is proved to be satisfied by the perfect reconstruction condition, and thus can be quite useful theoretically. At last, some experimental results are given to demonstrate the use fulness of this model.%针对图象处理中的图象重构问题,结合多频带DFT滤波器库和双变量Box样条构造了一个完全重构模型.在介绍了DFT滤波器库后,给出了形成完全重构模型的条件.通过双变量Box样条及其在图象处理中极为有用的几条性质的分析.提出了一类双变量Box样条,使用该样条即可构造分解/重构模型.实验证明,该模型能满足完全重构条件,并可有效分解合成图象.最后,给出了应用此模型的实验结果.

  3. The quest for the perfect model: Pre World War 1. Military land use modeling of the Greater Copenhagen area

    DEFF Research Database (Denmark)

    Svenningsen, Stig Roar; Brandt, Jesper; Christensen, Andreas Aagaard

    are a demanding task, which are always challenge by reality. However this is not solely a modern phenomenon and in this paper we are to explore the experience of the efforts of the Danish military to develop a land use model. In the end of the 19th century the Danish military realized, that they had a problem....... The landscape surrounding the fortress of Copenhagen was to flat and didn’t have enough fix point in form of landscape element to have a proper control of artillery fire from the batteries on the fortification. To fix this problem, the Danish military planned a comprehensive survey of the agricultural landscape...... the rotational system. At first the survey campaign seems to be going very well, but relative quickly did the military run into problems. The rapid urbanization of the landscape north of Copenhagen meant, that farming did not take place and at the island of Amager southwest of Copenhagen the farmers didn’t use...

  4. Jaw myology and bite force of the monk parakeet (Aves, Psittaciformes).

    Science.gov (United States)

    Carril, Julieta; Degrange, Federico J; Tambussi, Claudia P

    2015-07-01

    Psittaciform birds exhibit novelties in jaw bone structure and musculature that are associated with strong bite forces. These features include an ossified arcus suborbitalis and the muscles ethmomandibularis and pseudomasseter. We analyse the jaw musculature of the monk parakeet (Myiopsitta monachus) to enable future studies aimed at understanding craniofacial development, morphology, function and evolution. We estimate bite force based on muscle dissections, physiological cross-sectional area and skull biomechanical modelling. We also compare our results with available data for other birds and traced the evolutionary origin of the three novel diagnostic traits. Our results indicate that, in Myiopsitta, (i) the arcus suborbitalis is absent and the orbit is ventrally closed by an elongate processus orbitalis and a short ligamentum suborbitale; (ii) the ethmomandibularis muscle is a conspicuous muscle with two bellies, with its origin on the anterior portion of the septum interorbitale and insertion on the medial aspect of the mandible; (iii) the pseudomasseter muscle consists of some fibers arising from the m. adductor mandibulae externus superficialis, covering the lateral surface of the arcus jugalis and attaches by an aponeurotic sheet on the processus orbitalis; (iv) a well-developed adductor mandibulae complex is present; (v) the bite force estimation relative to body mass is higher than that calculated for other non-psittaciform species; and (vi) character evolution analysis revealed that the absence of the arcus suborbitalis and the presence of the m. pseudomassseter are the ancestral conditions, and mapping is inconclusive about presence of one or two bellies of the m. ethmomandibularis. © 2015 Anatomical Society.

  5. Jaw myology and bite force of the monk parakeet (Aves, Psittaciformes)

    Science.gov (United States)

    Carril, Julieta; Degrange, Federico J; Tambussi, Claudia P

    2015-01-01

    Psittaciform birds exhibit novelties in jaw bone structure and musculature that are associated with strong bite forces. These features include an ossified arcus suborbitalis and the muscles ethmomandibularis and pseudomasseter. We analyse the jaw musculature of the monk parakeet (Myiopsitta monachus) to enable future studies aimed at understanding craniofacial development, morphology, function and evolution. We estimate bite force based on muscle dissections, physiological cross-sectional area and skull biomechanical modelling. We also compare our results with available data for other birds and traced the evolutionary origin of the three novel diagnostic traits. Our results indicate that, in Myiopsitta, (i) the arcus suborbitalis is absent and the orbit is ventrally closed by an elongate processus orbitalis and a short ligamentum suborbitale; (ii) the ethmomandibularis muscle is a conspicuous muscle with two bellies, with its origin on the anterior portion of the septum interorbitale and insertion on the medial aspect of the mandible; (iii) the pseudomasseter muscle consists of some fibers arising from the m. adductor mandibulae externus superficialis, covering the lateral surface of the arcus jugalis and attaches by an aponeurotic sheet on the processus orbitalis; (iv) a well-developed adductor mandibulae complex is present; (v) the bite force estimation relative to body mass is higher than that calculated for other non-psittaciform species; and (vi) character evolution analysis revealed that the absence of the arcus suborbitalis and the presence of the m. pseudomassseter are the ancestral conditions, and mapping is inconclusive about presence of one or two bellies of the m. ethmomandibularis. PMID:26053435

  6. Ring the bell for Matins: circadian adaptation to split sleep by cloistered monks and nuns.

    Science.gov (United States)

    Arnulf, Isabelle; Brion, Agnès; Pottier, Michel; Golmard, Jean-Louis

    2011-12-01

    Cloistered monks and nuns adhere to a 10-century-old strict schedule with a common zeitgeber of a night split by a 2- to 3-h-long Office (Matins). The authors evaluated how the circadian core body temperature rhythm and sleep adapt in cloistered monks and nuns in two monasteries. Five monks and five nuns following the split-sleep night schedule for 5 to 46 yrs without interruption and 10 controls underwent interviews, sleep scales, and physical examination and produced a week-long sleep diary and actigraphy, plus 48-h recordings of core body temperature. The circadian rhythm of temperature was described by partial Fourier time-series analysis (with 12- and 24-h harmonics). The temperature peak and trough values and clock times did not differ between groups. However, the temperature rhythm was biphasic in monks and nuns, with an early decrease at 19:39 ± 4:30 h (median ± 95% interval), plateau or rise of temperature at 22:35 ± 00:23 h (while asleep) lasting 296 ± 39 min, followed by a second decrease after the Matins Office, and a classical morning rise. Although they required alarm clocks to wake-up for Matins at midnight, the body temperature rise anticipated the nocturnal awakening by 85 ± 15 min. Compared to the controls, the monks and nuns had an earlier sleep onset (20:05 ± 00:59 h vs. 00:00 ± 00:54 h, median ± 95% confidence interval, p= .0001) and offset (06:27 ± 0:22 h, vs. 07:37 ± 0:33 h, p= .0001), as well as a shorter sleep time (6.5 ± 0.6 vs. 7.6 ± 0.7 h, p= .05). They reported difficulties with sleep latency, sleep duration, and daytime function, and more frequent hypnagogic hallucinations. In contrast to their daytime silence, they experienced conversations (and occasionally prayers) in dreams. The biphasic temperature profile in monks and nuns suggests the human clock adapts to and even anticipates nocturnal awakenings. It resembles the biphasic sleep and rhythm of healthy volunteers transferred to a short (10-h) photoperiod and provides

  7. Optimal damping ratios of multi-axial perfectly matched layers for elastic-wave modeling in general anisotropic media

    CERN Document Server

    Gao, Kai

    2016-01-01

    The conventional Perfectly Matched Layer (PML) is unstable for certain kinds of anisotropic media. This instability is intrinsic and independent of PML formulation or implementation. The Multi-axial PML (MPML) removes such instability using a nonzero damping coefficient in the direction parallel with the interface between a PML and the investigated domain. The damping ratio of MPML is the ratio between the damping coefficients along the directions parallel with and perpendicular to the interface between a PML and the investigated domain. No quantitative approach is available for obtaining these damping ratios for general anisotropic media. We develop a quantitative approach to determining optimal damping ratios to not only stabilize PMLs, but also minimize the artificial reflections from MPMLs. Numerical tests based on finite-difference method show that our new method can effectively provide a set of optimal MPML damping ratios for elastic-wave propagation in 2D and 3D general anisotropic media.

  8. Nest-building behavior of Monk Parakeets and insights into potential mechanisms for reducing damage to utility poles.

    Science.gov (United States)

    Burgio, Kevin R; Rubega, Margaret A; Sustaita, Diego

    2014-01-01

    The Monk Parakeet (Myiopsitta monachus) commonly uses utility poles as a substrate for building large, bulky nests. These nests often cause fires and electric power outages, creating public safety risks and increasing liability and maintenance costs for electric companies. Previous research has focused on lethal methods and chemical contraception to prevent nesting on utility poles and electrical substations. However, implementation of lethal methods has led to public protests and lawsuits, while chemical contraception may affect other than the targeted species, and must be continually reapplied for effectiveness. One non-lethal alternative, nest removal, is costly and may not be a sustainable measure if Monk Parakeet populations continue to grow. In order to identify cost-effective non-lethal solutions to problems caused by Monk Parakeet nesting, we studied their behavior as they built nests on utility poles. Monk Parakeets initiate nests by attaching sticks at the intersection of the pole and electric lines. We found that parakeets use the electric lines exclusively to gain access to the intersection of lines and pole during nest initiation, and continue to use the lines intensively throughout construction. Monk Parakeets also have more difficulty attaching sticks during the early stages of nest construction than when the nest is nearing completion. These findings suggest that intervention during the earlier stages of nest building, by excluding Monk Parakeets from electric lines adjacent to poles, may be an effective, non-lethal method of reducing or eliminating parakeets nesting on, and damaging, utility poles.

  9. Nest-building behavior of Monk Parakeets and insights into potential mechanisms for reducing damage to utility poles

    Directory of Open Access Journals (Sweden)

    Kevin R. Burgio

    2014-09-01

    Full Text Available The Monk Parakeet (Myiopsitta monachus commonly uses utility poles as a substrate for building large, bulky nests. These nests often cause fires and electric power outages, creating public safety risks and increasing liability and maintenance costs for electric companies. Previous research has focused on lethal methods and chemical contraception to prevent nesting on utility poles and electrical substations. However, implementation of lethal methods has led to public protests and lawsuits, while chemical contraception may affect other than the targeted species, and must be continually reapplied for effectiveness. One non-lethal alternative, nest removal, is costly and may not be a sustainable measure if Monk Parakeet populations continue to grow. In order to identify cost-effective non-lethal solutions to problems caused by Monk Parakeet nesting, we studied their behavior as they built nests on utility poles. Monk Parakeets initiate nests by attaching sticks at the intersection of the pole and electric lines. We found that parakeets use the electric lines exclusively to gain access to the intersection of lines and pole during nest initiation, and continue to use the lines intensively throughout construction. Monk Parakeets also have more difficulty attaching sticks during the early stages of nest construction than when the nest is nearing completion. These findings suggest that intervention during the earlier stages of nest building, by excluding Monk Parakeets from electric lines adjacent to poles, may be an effective, non-lethal method of reducing or eliminating parakeets nesting on, and damaging, utility poles.

  10. Unrelenting spread of the alien monk parakeet Myiopsitta monachus in Israel. Is it time to sound the alarm?

    Science.gov (United States)

    Postigo, Jose-Luis; Shwartz, Assaf; Strubbe, Diederik; Muñoz, Antonio-Román

    2017-02-01

    Monk parakeets, Myiopsitta monachus Boddaert, are native to South America but have established populations in North America, Europe, Africa and Asia. They are claimed to act as agricultural pests in their native range, and their communal stick nests may damage human infrastructure. Although several monk parakeet populations are present in the Mediterranean Basin and temperate Europe, little empirical data are available on their population size and growth, distribution and potential impact. We investigated the temporal and spatial dynamics of monk parakeets in Israel to assess their invasion success and potential impact on agriculture. Monk parakeet populations are growing exponentially at a higher rate than that reported elsewhere. The current Israeli population of monk parakeets comprises approximately 1500 individuals. The distribution of the species has increased and shifted from predominantly urban areas to agricultural landscapes. In Israel, monk parakeet populations are growing fast and have dispersed rapidly from cities to agricultural areas. At present, reports of agricultural damage are scarce. A complete assessment of possible management strategies is urgently needed before the population becomes too large and widespread to allow for cost-effective mitigation campaigns to be implemented. © 2016 Society of Chemical Industry. © 2016 Society of Chemical Industry.

  11. Perfect drain for the Maxwell fish eye lens

    Science.gov (United States)

    González, Juan C.; Benítez, Pablo; Miñano, Juan C.

    2011-02-01

    Perfect imaging of electromagnetic waves using the Maxwell fish eye (MFE) requires a new concept: a point called the perfect drain that we shall call the perfect point drain. From the mathematical point of view, a perfect point drain is just like an ideal point source, except that it drains power from the electromagnetic field instead of generating it. We introduce here the perfect drain for the MFE as a dissipative region of non-zero size that completely drains the power from the point source. To accomplish this goal, the region must have a precise complex permittivity that depends on its size as well as on the frequency. The perfect point drain is obtained when the diameter of the perfect drain tends to zero. This interpretation of the perfect point drain is connected well with common concepts of electromagnetic theory, opening up both modeling in computer simulations and experimental verification of setups containing a perfect point drain.

  12. Unidirectional perfect absorber

    Science.gov (United States)

    Jin, L.; Wang, P.; Song, Z.

    2016-09-01

    This study proposes a unidirectional perfect absorber (UPA), which we realized with a two-arm Aharonov-Bohm interferometer, that consists of a dissipative resonator side-coupled to a uniform resonator array. The UPA has reflection-less full absorption on one direction, and reflectionless full transmission on the other, with an appropriate magnetic flux and coupling, detuning, and loss of the side-coupled resonator. The magnetic flux controls the transmission, the left transmission is larger for magnetic flux less than one-half flux quantum; and the right transmission is larger for magnetic flux between one-half and one flux quantum. Besides, a perfect absorber (PA) can be realized based on the UPA, in which light waves from both sides, with arbitrary superposition of the ampli- tude and phase, are perfectly absorbed. The UPA is expected to be useful in the design of novel optical devices.

  13. The Current Status and Future Plans for the Monte Carlo Codes MONK and MCBEND

    Science.gov (United States)

    Smith, N.; Shuttleworth, T.; Grimstone, M.; Hutton, L.; Armishaw, M.; Bird, A.; France, N.; Connolly, S.

    MONK and MCBEND are software tools used for criticality/reactor physics and shielding/dosimetry/general radiation transport applications respectively. The codes are developed by a collaboration comprising AEA Technology and BNFL, and AEA Technology's ANSWERS Software Service supplies them to customers throughout the world on a commercial basis. In keeping with this commercial nature it is vital that the codes' development programmes evolve to meet the diverse expectations of the current and potential customer base. This involves striving to maintain an acceptable balance in the development of the various components that comprise a modern software package. This paper summarises the current status of MONK and MCBEND by indicating how the task of trying to achieve this difficult balance has been addressed in the recent past and is being addressed for the future.

  14. An evaluation of monk parakeet damage to crops in the metropolitan area of Barcelona

    Directory of Open Access Journals (Sweden)

    Senar, J. C.

    2016-05-01

    Full Text Available We evaluated damage to commercial crops caused by the monk parakeet, Myiopsitta monachus, in the Baix Llobregat agricultural area (1,024 ha bordering the city of Barcelona, Spain. Average crop loss was 0.4% for tomatoes, 28% for corn, 9% for red plums, 36% for round plums, 37% for pears, 17% for persimmons, and 7% for quinces. Our data show that the potential damage to crops by monk parakeets in this invaded area is now a reality. As a wait–and–see approach is likely to be a more costly strategy in the long–term, policy makers should assess issues such as the extent of damage, feasibility/cost benefit analysis, and public opinion so as to avoid greater damage and loss in the future.

  15. An evaluation of monk parakeet damage to crops in the metropolitan area of Barcelona

    Energy Technology Data Exchange (ETDEWEB)

    Senar, J.C.; Domenech, J.; Arroyo, L.; Torre, I.; Gordo, O.

    2016-07-01

    We evaluated damage to commercial crops caused by the monk parakeet, Myiopsitta monachus, in the Baix Llobregat agricultural area (1,024 ha) bordering the city of Barcelona, Spain. Average crop loss was 0.4% for tomatoes, 28% for corn, 9% for red plums, 36% for round plums, 37% for pears, 17% for persimmons, and 7% for quinces. Our data show that the potential damage to crops by monk parakeets in this invaded area is now a reality. As a wait–and–see approach is likely to be a more costly strategy in the long–term, policy makers should assess issues such as the extent of damage, feasibility/cost benefit analysis, and public opinion so as to avoid greater damage and loss in the future. (Author)

  16. Perfect Liberty or Natural Liberty?

    DEFF Research Database (Denmark)

    2012-01-01

    the meaning of what was “natural” about economic life. The Physiocrats believed it possible to identify a model or a perfect regime of natural order – an order that they in fact thought to exist and function in China due to a rigorous system of economic laws. Smith sided with contemporary critics......The article investigates the concept of natural order as it is used by François Quesnay and Adam Smith in their respective economic writings. While Smith used the concept only after having visited Quesnay and the Physiocrats in France in the 1760s, in The Wealth of Nations he sought to negotiate...... of this metaphysical vision of economic perfection (and of Chinese governance), but he suggested that the economic mechanisms of the physiocratic theories would remain intact even with a minimum of control by state laws. However, Smith’s balancing act on these questions remained disputed even by his Scottish...

  17. Genetic evidence links invasive monk parakeet populations in the United States to the international pet trade

    Directory of Open Access Journals (Sweden)

    Avery Michael L

    2008-07-01

    Full Text Available Abstract Background Severe ecological and economic impacts caused by some invasive species make it imperative to understand the attributes that permit them to spread. A notorious crop pest across its native range in South America, the monk parakeet (Myiopsitta monachus has become established on four other continents, including growing populations in the United States. As a critical first step to studying mechanisms of invasion success in this species, here we elucidated the geographical and taxonomic history of the North American invasions of the monk parakeet. Specifically, we conducted a genetic assessment of current monk parakeet taxonomy based on mitochondrial DNA control region sequences from 73 museum specimens. These data supported comparative analyses of mtDNA lineage diversity in the native and naturalized ranges of the monk parakeet and allowed for identification of putative source populations. Results There was no molecular character support for the M. m. calita, M. m. cotorra, and M. m. monachus subspecies, while the Bolivian M. m. luchsi was monophyletic and diagnosably distinct. Three haplotypes sampled in the native range were detected within invasive populations in Florida, Connecticut, New Jersey and Rhode Island, the two most common of which were unique to M. m. monachus samples from eastern Argentina and bordering areas in Brazil and Uruguay. Conclusion The lack of discrete morphological character differences in tandem with the results presented here suggest that M. m. calita, M. m. cotorra and M. m. monachus are in need of formal taxonomic revision. The genetic distinctiveness of M. m. luchsi is consistent with previous recommendations of allospecies status for this taxon. The geographic origins of haplotypes sampled in the four U.S. populations are concordant with trapping records from the mid-20th century and suggest that propagule pressure exerted by the international pet bird trade contributed to the establishment of

  18. Genetic evidence of extra-pair paternity and intraspecific brood parasitism in the monk parakeet.

    Science.gov (United States)

    Martínez, Juan José; de Aranzamendi, María Carla; Masello, Juan F; Bucher, Enrique H

    2013-11-09

    The monk parakeet (Myiopsitta monachus) is a widespread invasive species native to southern South America that has become established in many regions of the world. Monk parakeets breed in a large, fully enclosed structure built from twigs, which consist of one to many individual brooding chambers. The species has been considered to be socially and genetically monogamous. However, genetic relatedness of adults to juveniles in the native area was found to be lower than expected for monogamy. To assess the significance of this discrepancy, we examined individual and population genetic patterns of microsatellite loci at two sites in Córdoba province, Argentina. We sampled 154 nestlings and 42 adults in Córdoba, Argentina. Mean value of pairwise relatedness of nestlings within chambers was about 0.40. Contrarily, relatedness of nestlings between chambers was close to zero. We found a considerable degree of variation in nestling pairwise relatedness and parentage within chambers, including chambers with combinations of unrelated, half-sib, and full-sib nestlings. The proportion of sibling relatedness indicated monogamy in 47% and extra pair-paternity in 40% of the chambers. We also found intra-brood parasitism in 3% of the chambers. Our results indicate that the monk parakeet is sexually polygamous in its native range in Argentina, which is consistent with the observed mean value of relatedness of adults to juveniles of about 0.4. We also confirm the existence of intra-brood parasitism. High density of monk parakeets may favor occurrence of extra-pair paternity and intra-brood parasitism in the native sites.

  19. Genetic evidence links invasive monk parakeet populations in the United States to the international pet trade.

    Science.gov (United States)

    Russello, Michael A; Avery, Michael L; Wright, Timothy F

    2008-07-24

    Severe ecological and economic impacts caused by some invasive species make it imperative to understand the attributes that permit them to spread. A notorious crop pest across its native range in South America, the monk parakeet (Myiopsitta monachus) has become established on four other continents, including growing populations in the United States. As a critical first step to studying mechanisms of invasion success in this species, here we elucidated the geographical and taxonomic history of the North American invasions of the monk parakeet. Specifically, we conducted a genetic assessment of current monk parakeet taxonomy based on mitochondrial DNA control region sequences from 73 museum specimens. These data supported comparative analyses of mtDNA lineage diversity in the native and naturalized ranges of the monk parakeet and allowed for identification of putative source populations. There was no molecular character support for the M. m. calita, M. m. cotorra, and M. m. monachus subspecies, while the Bolivian M. m. luchsi was monophyletic and diagnosably distinct. Three haplotypes sampled in the native range were detected within invasive populations in Florida, Connecticut, New Jersey and Rhode Island, the two most common of which were unique to M. m. monachus samples from eastern Argentina and bordering areas in Brazil and Uruguay. The lack of discrete morphological character differences in tandem with the results presented here suggest that M. m. calita, M. m. cotorra and M. m. monachus are in need of formal taxonomic revision. The genetic distinctiveness of M. m. luchsi is consistent with previous recommendations of allospecies status for this taxon. The geographic origins of haplotypes sampled in the four U.S. populations are concordant with trapping records from the mid-20th century and suggest that propagule pressure exerted by the international pet bird trade contributed to the establishment of invasive populations in the United States.

  20. Parasitic survey on introduced monk parakeets (Myiopsitta monachus in Santiago, Chile

    Directory of Open Access Journals (Sweden)

    Cristóbal Briceño

    Full Text Available Abstract Central Chile has been identified as a unique ecosystem with high conservation priority because of its high levels of endemism and intensive anthropic pressure. Over a period of almost four decades, the monk parakeet has been successful in establishing and dispersing in urban Santiago, although little is known about its potential impact. Furthermore, nothing is known about its epidemiological risks towards animals or even humans. For this reason, we conducted the first parasitic survey of monk parakeets in Chile through capture, necropsy and thorough external and internal inspection of 92 adult individuals. Among these, 45.7% presented lice that were identified as Paragoniocotes fulvofasciatum, 1.1% had mesostigmatid acari and 8.9% had free-ranging acari. Among 89 parakeets, 19.1% had structures identified as Cryptosporidium sp. This study provides the first description of Cryptosporidium sp. in monk parakeets. Along with the presence of a mesostigmatid acarus in one parakeet, this serves as a public health warning, given that both of these parasites have zoonotic potential.

  1. Parasitic survey on introduced monk parakeets (Myiopsitta monachus) in Santiago, Chile.

    Science.gov (United States)

    Briceño, Cristóbal; Surot, Dominique; González-Acuña, Daniel; Martínez, Francisco Javier; Fredes, Fernando

    2017-01-01

    Central Chile has been identified as a unique ecosystem with high conservation priority because of its high levels of endemism and intensive anthropic pressure. Over a period of almost four decades, the monk parakeet has been successful in establishing and dispersing in urban Santiago, although little is known about its potential impact. Furthermore, nothing is known about its epidemiological risks towards animals or even humans. For this reason, we conducted the first parasitic survey of monk parakeets in Chile through capture, necropsy and thorough external and internal inspection of 92 adult individuals. Among these, 45.7% presented lice that were identified as Paragoniocotes fulvofasciatum, 1.1% had mesostigmatid acari and 8.9% had free-ranging acari. Among 89 parakeets, 19.1% had structures identified as Cryptosporidium sp. This study provides the first description of Cryptosporidium sp. in monk parakeets. Along with the presence of a mesostigmatid acarus in one parakeet, this serves as a public health warning, given that both of these parasites have zoonotic potential.

  2. Integrating multiple technologies to understand the foraging behaviour of Hawaiian monk seals

    Science.gov (United States)

    Littnan, Charles; Halpin, Patrick; Read, Andrew

    2017-01-01

    The objective of this research was to investigate and describe the foraging behaviour of monk seals in the main Hawaiian Islands. Specifically, our goal was to identify a metric to classify foraging behaviour from telemetry instruments. We deployed accelerometers, seal-mounted cameras and GPS tags on six monk seals during 2012–2014 on the islands of Molokai, Kauai and Oahu. We used pitch, calculated from the accelerometer, to identify search events and thus classify foraging dives. A search event and consequent ‘foraging dive’ occurred when the pitch was greater than or equal to 70° at a depth less than or equal to −3 m. By integrating data from the accelerometers with video and GPS, we were able to ground-truth this classification method and identify environmental variables associated with each foraging dive. We used Bayesian logistic regression to identify the variables that influenced search events. Dive depth, body motion (mean overall dynamic body acceleration during the dive) and proximity to the sea floor were the best predictors of search events for these seals. Search events typically occurred on long, deep dives, with more time spent at the bottom (more than 50% bottom time). We can now identify where monk seals are foraging in the main Hawaiian Islands (MHI) and what covariates influence foraging behaviour in this region. This increased understanding will inform management strategies and supplement outreach and recovery efforts. PMID:28405358

  3. Self-reported morbidity and disability among Trappist and Benedictine monks.

    Science.gov (United States)

    Mackenbach, J P; Kunst, A E; de Vrij, J H; van Meel, D

    1993-10-15

    Studies of religious groups that impose prudent lifestyles on their members show low mortality rates in these groups, but it is unclear whether their morbidity rates are also low. The authors studied the prevalence of self-reported morbidity and disability among Trappist and Benedictine monks in the Netherlands. A health interview survey was administered in seven monasteries; the response rate was 67% (n = 134). Rates of morbidity and disability among monks were compared with those among all Dutch males by calculation of standardized morbidity ratios, adjusting for age and (in the case of morbidity) education. Self-reported morbidity among monks was similar to that in the general population (e.g., for one or more chronic conditions: standardized morbidity ratio = 1.07, 95% confidence interval 0.89-1.26), but rates of disability related to activities of daily living were much higher (e.g., for any trouble sitting down and getting up from a chair: standardized morbidity ratio = 2.21, 95% confidence interval 1.44-3.32). The authors hypothesize that a prudent lifestyle may prolong life, but at the expense of a higher prevalence of disability.

  4. Everybody's Different Nobody's Perfect

    Science.gov (United States)

    ... traten ni qué edad tengan — eso se llama “DISCAPACIDAD.” Some kids have a disability because their muscles ... have one? ¿Conoces a alguien que tenga una discapacidad? ¿Tienes una tú? Everybody’s different, nobody’s perfect. So ...

  5. The Three Perfections

    Science.gov (United States)

    Hinshaw, Craig

    2005-01-01

    For thousands of years, the three perfections--painting, poetry, and calligraphy--have been considered the mark of an enlightened person throughout Asian cultures. Fifth-grade students learned about these three hallmarks by studying three works from the Detroit Institute of Art's Asian collection: a nineteenth-century Japanese hand scroll, a…

  6. Ordaining for Learning Culture: Educational Conservation and Development of Buddhist Monk Universities for Isan People with Limited Opportunity

    Directory of Open Access Journals (Sweden)

    Sanit Sumhiram

    2012-01-01

    Full Text Available Problem statement: Buddhist monk universities in Isan (northeast Thailand have problems of lacking Buddhist monk students. The number of people ordained for learning decreases because Isan people do not like ordaining for learning. In order to adjust the condition of problem to catch up with current conditions, this research study was conducted. The purpose of this research was to examine the background, current conditions, problems and process of conserving and developing ordaining for learning at Buddist monk universities for people with limited opportunity in Isan. Approach: The research area covered Khon Kaen, Nakhon Ratchasima and Roi Et provinces. Each of these provinces had campuses of the 2 Buddhist monk universities located in the same province. These universities had continuously been proving education at the undergraduate and graduate studies level up to present. The research procedure used the qualitative research methodology. Data were collected from documents, related literature and field studies using survey, observation, interviews and focus group discussion from a group of totally 208 informants. The findings were presented by means of a descriptive analysis. Results: There were 2 universities: (1 Mahachulalongkornrajavidyalaya University provided education at 3 locations: Khon Kaen Campus, first offered in 1986; Nakhon Ratchasima Campus, first established in 1987 and Roi Et Classroom, first established in 1999 according to the project for classroom extension by Khon Kaen Campus. (2 Mahamakut Buddhist University provided education at 3 locations: Isan Campus, located in Khon Kaen province, first established in 1990; Roi Et Campus, first established in 1994 and Koraj Education Center, located in Nakhon Ratchasima province, first established in 2006. For current conditions and problems of ordaining for learning at Buddhist monk universities for people with limited opportunity in Isan, Mahachulalongkornrajavidyalaya University at

  7. Perfect Crystals of $U_{q}(G_{2}^{(1)})$

    CERN Document Server

    Yamane, S

    1997-01-01

    The notion of perfect crystals was introduced in "Perfect Crystal and Vertex Models", (Internat. J. Modern Phys. A7(1992)449-484) by S-J. Kang et al. In this paper, we give a series of perfect crystals of $U_q(G_2^{(1)})$.

  8. Trace element concentrations in the Mediterranean monk seal (Monachus monachus) in the eastern Mediterranean Sea.

    Science.gov (United States)

    Formigaro, Costanza; Karamanlidis, Alexandros A; Dendrinos, Panagiotis; Marsili, Letizia; Silvi, Marina; Zaccaroni, Annalisa

    2017-01-15

    The Mediterranean monk seal (Monachus monachus) is one of the most endangered marine mammals in the world. The biggest sub-population of the species survives in Greece, where understanding the effects of pollution on the survival of the species has been identified as a national research and conservation priority. From 1990 to 2013 we collected tissue samples from 59 deceased monk seals in order to: (i) Define the concentration of trace elements (As, Pb, Cd, Hg, Se, Cr, Ni) in three different matrices (i.e., blubber, liver and kidney), (ii) Determine whether differences in trace element concentrations are age- or gender-related, (iii) Evaluate the potential effects of these pollutants. The study recorded differences in trace element concentrations among matrices, but in general, trace element exposure in Mediterranean monk seals in Greece was low and within the non-acutely toxic levels for Pinnipeds. Only arsenic concentrations were at the upper limit of the normal range observed in other marine mammals (0.69±0.55mg/kg w.w. in blubber, 0.79±0.62mg/kg w.w. in liver and 0.79±0.59mg/kg w.w. in kidney). We recorded also exceptionally high Hg concentrations in a single adult female (24.88mg/kg w.w.). Age- and gender-related differences were also recorded and were due to various biological, ecological and chemical factors. Based on the results of the study, potentially adverse effects on the immune and endocrine system of the Mediterranean monk seal from some pollutants (e.g., As, Cd, Se, Ni, Cr) cannot be ruled out, which may expose the Mediterranean seal population in Greece to epizootics and stochastic phenomena of mass mortality. It is therefore of utmost importance that pollutant monitoring becomes an integral component of the standard monitoring protocol of the endangered Mediterranean monk seal in the eastern Mediterranean. Copyright © 2016 Elsevier B.V. All rights reserved.

  9. Perfect Dispersive Medium

    CERN Document Server

    Gupta, Shulabh

    2015-01-01

    Dispersion is at the heart of all ultrafast real-time signal processing systems across the entire electromagnetic spectrum ranging from radio-frequencies to optics. However, following Kramer-Kronig relations, these signal processing systems have been plagued with the parasitic amplitude distortions due to frequency dependent, and non-flat amplitude transmission of naturally dispersive media. This issue puts a serious limitation on the applicability and performance of these signal processing systems. To solve the above mentioned issue, a perfect dispersive medium is proposed in this work, which artificially violates the Kramer-Kronig relations, while satisfying all causality requirements. The proposed dispersive metamaterial is based on loss-gain metasurface pairs and exhibit a perfectly flat transmission response along with arbitrary dispersion in a broad bandwidth, thereby solving a seemingly unavoidable issue in all ultrafast signal processing systems. Such a metamaterial is further shown using sub-waveleng...

  10. The internal consistency of perfect competition

    OpenAIRE

    Jakob Kapeller; Stephan Pühringer

    2010-01-01

    This article surveys some arguments brought forward in defense of the theory of perfect competition. While some critics propose that the theory of perfect competition, and thus also the theory of the firm, are logically flawed, (mainstream) economists defend their most popular textbook model by a series of apparently different arguments. Here it is examined whether these arguments are comparable, consistent and convincing from the point of view of philosophy of science.

  11. Buddhism at Crossroads: A Case Study of Six Tibetan Buddhist Monks Navigating the Intersection of Buddhist Theology and Western Science

    Science.gov (United States)

    Sonam, Tenzin

    Recent effort to teach Western science in the Tibetan Buddhist monasteries has drawn interest both within and outside the quarters of these monasteries. This novel and historic move of bringing Western science in a traditional monastic community began around year 2000 at the behest of His Holiness the Dalai Lama, the spiritual head of Tibetan Buddhism. Despite the novelty of this effort, the literature in science education about learners from non-Western communities suggests various "cognitive conflicts" experienced by these non-Western learners due to fundamental difference in the worldview of the two knowledge traditions. Hence, in this research focuses on how six Tibetan Buddhist monks were situating/reconciling the scientific concepts like the theory of evolution into their traditional Buddhist worldview. The monks who participated in this study were engaged in a further study science at a university in the U.S. for two years. Using case study approach, the participants were interviewed individually and in groups over the two-year period. The findings revealed that although the monks scored highly on their acceptance of evolution on the Measurement of Acceptance of Theory of Evolution (MATE) survey, however in the follow-up individual and focus group interviews, certain conflicts as well as agreement between the theory of evolution and their Buddhist beliefs were revealed. The monks experienced conflicts over concepts within evolution such as common ancestry, human evolution, and origin of life, and in reconciling the Buddhist and scientific notion of life. The conflicts were analyzed using the theory of collateral learning and was found that the monks engaged in different kinds of collateral learning, which is the degree of interaction and resolution of conflicting schemas. The different collateral learning of the monks was correlated to the concepts within evolution and has no correlation to the monks' years in secular school, science learning or their

  12. 清代蒙古僧侣贵族述论%Mongolian Monks of Noble of Qing Dynasty

    Institute of Scientific and Technical Information of China (English)

    王力

    2012-01-01

    清代蒙古社会僧侣贵族的产生,主要有蒙古王公贵族出家为僧、西藏高僧活佛转世以及中央政府册封等,这三种途径既相互交织,又各具特色。僧侣贵族的形成,不仅改变了蒙古的社会结构,而且在一定程度上对蒙古社会的发展产生了重要影响。%Based on the various literature material, this article discusses the Mongolian social monks noble formed way and its ihtluence in Qing Dynasty. produced way of monks noble, basically have Mongolia nobility Mongolian took vows to become a monk, reincarnation of Tibetan monks and the central government conferring, the three kind of way is mutually intertwined, and each has its own characteristics. The formation of the monks noble, not only change the Mongolian social structure, and to a certain extent to the development of Mongolian society has produced important influence.

  13. A three-dimensional coupled-mode model for the acoustic field in a two-dimensional waveguide with perfectly reflecting boundaries

    Science.gov (United States)

    Luo, Wen-Yu; Yu, Xiao-Lin; Yang, Xue-Feng; Zhang, Ze-Zhong; Zhang, Ren-He

    2016-12-01

    This paper presents a three-dimensional (3D) coupled-mode model using the direct-global-matrix technique as well as Fourier synthesis. This model is a full wave, two-way three-dimensional model, and is therefore capable of providing accurate acoustic field solutions. Because the problem of sound propagation excited by a point source in an ideal wedge with perfectly reflecting boundaries is one of a few three-dimensional problems with analytical solutions, the ideal wedge problem is chosen in this work to validate the presented three-dimensional model. Numerical results show that the field results by analytical solutions and those by the presented model are in excellent agreement, indicating that the presented model can serve as a benchmark model for three-dimensional sound propagation problems involving a planar two-dimensional geometry as well as a point source. Project supported by the National Natural Science Foundation of China (Grant Nos. 11125420, 11434012, and 41561144006) and the Knowledge Innovation Program of the Chinese Academy of Sciences.

  14. Perfect simulation of Hawkes processes

    DEFF Research Database (Denmark)

    Møller, Jesper; Rasmussen, Jakob Gulddahl

    This article concerns a perfect simulation algorithm for unmarked and marked Hawkes processes. The usual stratihtforward simulation algorithm suffers from edge effects, whereas our perfect simulation algorithm does not. By viewing Hawkes processes as Poisson cluster processes and using...

  15. Building the perfect PC

    CERN Document Server

    Thompson, Robert Bruce

    2006-01-01

    This popular Build-It-Yourself (BIY) PC book covers everything you want to know about building your own system: Planning and picking out the right components, step-by-step instructions for assembling your perfect PC, and an insightful discussion of why you'd want to do it in the first place. Most big brand computers from HP, Dell and others use lower-quality components so they can meet their aggressive pricing targets. But component manufacturers also make high-quality parts that you can either purchase directly, or obtain through distributors and resellers. Consumers and corporations

  16. Variación en la fórmula de detectives de Monk.

    OpenAIRE

    Audy Yuliser, Castañeda Castañeda

    2012-01-01

    A lo largo de la historia televisiva estadounidense han surgido diversas series con detectives más o menos célebres. Más recientemente ha surgido un nuevo detective a la usanza de los clásicos. Se trata del señor Monk, cuyas características exploramos en esta investigación, inscrita en el ámbito de la literatura comparada. Dichas características serán contrastadas con los lineamientos de la fórmula clásica de detectives, así como con las innovaciones introducidas por Dashiell Hammett en su ob...

  17. Metamaterials for perfect absorption

    CERN Document Server

    Lee, Young Pak; Yoo, Young Joon; Kim, Ki Won

    2016-01-01

    This book provides a comprehensive overview of the theory and practical development of metamaterial-based perfect absorbers (MMPAs). It begins with a brief history of MMPAs which reviews the various theoretical and experimental milestones in their development. The theoretical background and fundamental working principles of MMPAs are then discussed, providing the necessary background on how MMPAs work and are constructed. There then follows a section describing how different MMPAs are designed and built according to the operating frequency of the electromagnetic wave, and how their behavior is changed. Methods of fabricating and characterizing MMPAs are then presented. The book elaborates on the performance and characteristics of MMPAs, including electromagnetically-induced transparency (EIT). It also covers recent advances in MMPAs and their applications, including multi-band, broadband, tunability, polarization independence and incidence independence. Suitable for graduate students in optical sciences and e...

  18. Perfect Circular Dichroic Metamirrors

    CERN Document Server

    Wang, Zuojia; Liu, Yongmin

    2015-01-01

    In nature, the beetle Chrysina gloriosa derives its iridescence by selectively reflecting left-handed circularly polarized light only. Here, for the first time, we introduce and demonstrate the optical analogue based on an ultrathin metamaterial, which we term circular dichroic metamirror. A general method to design the circular dichroic metasmirror is presented under the framework of Jones calculus. It is analytically shown that the metamirror can be realized by two layers of anisotropic metamaterial structures, in order to satisfy the required simultaneous breakings of n-fold rotational (n>2) and mirror symmetries. We design an infrared metamirror, which shows perfect reflectance for left-handed circularly polarized light without reversing its handedness, while almost completely absorbs right-handed circularly polarized light. These findings offer new methodology to realize novel chiral optical devices for a variety of applications, including polarimetric imaging, molecular spectroscopy, as well as quantum ...

  19. The pursuit of perfect packing

    CERN Document Server

    Weaire, Denis

    2008-01-01

    Coauthored by one of the creators of the most efficient space packing solution, the Weaire-Phelan structure, The Pursuit of Perfect Packing, Second Edition explores a problem of importance in physics, mathematics, chemistry, biology, and engineering: the packing of structures. Maintaining its mathematical core, this edition continues and revises some of the stories from its predecessor while adding several new examples and applications. The book focuses on both scientific and everyday problems ranging from atoms to honeycombs. It describes packing models, such as the Kepler conjecture, Voronoï decomposition, and Delaunay decomposition, as well as actual structure models, such as the Kelvin cell and the Weaire-Phelan structure. The authors discuss numerous historical aspects and provide biographical details on influential contributors to the field, including emails from Thomas Hales and Ken Brakke. With examples from physics, crystallography, engineering, and biology, this accessible and whimsical bo...

  20. Range-wide genetic connectivity of the Hawaiian monk seal and implications for translocation.

    Science.gov (United States)

    Schultz, Jennifer K; Baker, Jason D; Toonen, Robert J; Harting, Albert L; Bowen, Brian W

    2011-02-01

    The Hawaiian monk seal (Monachus schauinslandi) is one of the most critically endangered marine mammals. Less than 1200 individuals remain, and the species is declining at a rate of approximately 4% per year as a result of juvenile starvation, shark predation, and entanglement in marine debris. Some of these problems may be alleviated by translocation; however, if island breeding aggregates are effectively isolated subpopulations, moving individuals may disrupt local adaptations. In these circumstances, managers must balance the pragmatic need of increasing survival with theoretical concerns about genetic viability. To assess range-wide population structure of the Hawaiian monk seal, we examined an unprecedented, near-complete genetic inventory of the species (n =1897 seals, sampled over 14 years) at 18 microsatellite loci. Genetic variation was not spatially partitioned ((w) =-0.03, p = 1.0), and a Bayesian clustering method provided evidence of one panmictic population (K =1). Pairwise F(ST) comparisons (among 7 island aggregates over 14 annual cohorts) did not reveal temporally stable, spatial reproductive isolation. Our results coupled with long-term tag-resight data confirm seal movement and gene flow throughout the Hawaiian Archipelago. Thus, human-mediated translocation of seals among locations is not likely to result in genetic incompatibilities.

  1. Portrayal of Mental Illness on the TV Series Monk: Presumed Influence and Consequences of Exposure.

    Science.gov (United States)

    Hoffner, Cynthia A; Cohen, Elizabeth L

    2015-01-01

    This study of responses to the TV series Monk, about a detective with obsessive-compulsive disorder, examines perceptions and behaviors related to mental illness. A total of 172 respondents completed an online survey. A parasocial bond with Monk was associated with lower stereotypes of mental illness and less social distance. Predictors and outcomes of perceived influence of the series on self and others were also examined. Perceived (positive) influence of the series on others' attitudes was predicted by respondents' favorable evaluation of the series's depiction of mental illness, as well as greater perceived exposure to and favorable evaluations among family and friends. Perceived influence on others also was associated with greater willingness to disclose mental health treatment, but only among people without personal or family experience with mental illness. In contrast, perceived influence of the series on self was predicted only by respondents' own evaluations of the series, and was related to willingness to seek mental health treatment-but only among those who had personally dealt with mental illness.

  2. Bayesian modeling and inference for diagnostic accuracy and probability of disease based on multiple diagnostic biomarkers with and without a perfect reference standard.

    Science.gov (United States)

    Jafarzadeh, S Reza; Johnson, Wesley O; Gardner, Ian A

    2016-03-15

    The area under the receiver operating characteristic (ROC) curve (AUC) is used as a performance metric for quantitative tests. Although multiple biomarkers may be available for diagnostic or screening purposes, diagnostic accuracy is often assessed individually rather than in combination. In this paper, we consider the interesting problem of combining multiple biomarkers for use in a single diagnostic criterion with the goal of improving the diagnostic accuracy above that of an individual biomarker. The diagnostic criterion created from multiple biomarkers is based on the predictive probability of disease, conditional on given multiple biomarker outcomes. If the computed predictive probability exceeds a specified cutoff, the corresponding subject is allocated as 'diseased'. This defines a standard diagnostic criterion that has its own ROC curve, namely, the combined ROC (cROC). The AUC metric for cROC, namely, the combined AUC (cAUC), is used to compare the predictive criterion based on multiple biomarkers to one based on fewer biomarkers. A multivariate random-effects model is proposed for modeling multiple normally distributed dependent scores. Bayesian methods for estimating ROC curves and corresponding (marginal) AUCs are developed when a perfect reference standard is not available. In addition, cAUCs are computed to compare the accuracy of different combinations of biomarkers for diagnosis. The methods are evaluated using simulations and are applied to data for Johne's disease (paratuberculosis) in cattle.

  3. The perfect message at the perfect moment.

    Science.gov (United States)

    Kalyanam, Kirthi; Zweben, Monte

    2005-11-01

    Marketers planning promotional campaigns ask questions to boost the odds that the messages will be accepted: Who should receive each message? What should be its content? How should we deliver it? The one question they rarely ask is, when should we deliver it? That's too bad, because in marketing, timing is arguably the most important variable of all. Indeed, there are moments in a customer's relationship with a business when she wants to communicate with that business because something has changed. If the company contacts her with the right message in the right format at the right time, there's a good chance of a warm reception. The question of "when" can be answered by a new computer-based model called "dialogue marketing," which is, to date, the highest rung on an evolutionary ladder that ascends from database marketing to relationship marketing to one-to-one marketing. Its principle advantages over older approaches are that it is completely interactive, exploits many communication channels, and is "relationship aware": that is, it continuously tracks every nuance of the customer's interaction with the business. Thus, dialogue marketing responds to each transition in that relationship at the moment the customer requires attention. Turning a traditional marketing strategy into a dialogue-marketing program is a straightforward matter. Begin by identifying the batch communications you make with customers, then ask yourself what events could trigger those communications to make them more timely. Add a question or call to action to each message and prepare a different treatment or response for each possible answer. Finally, create a series of increasingly urgent calls to action that kick in if the question or call to action goes unanswered by the customer. As dialogue marketing proliferates, it may provide the solid new footing that Madison Avenue seeks.

  4. Perfect Actions for Scalar Theories

    CERN Document Server

    Bietenholz, W

    1998-01-01

    We construct an optimally local perfect lattice action for free scalars of arbitrary mass, and truncate its couplings to a unit hypercube. Spectral and thermodynamic properties of this ``hypercube scalar'' are drastically improved compared to the standard action. We also discuss new variants of perfect actions, using anisotropic of triangular lattices, or applying new types of RGTs. Finally we add a $\\lambda \\phi^{4}$ term and address perfect lattice perturbation theory. We report on a lattice action for the anharmonic oscillator, which is perfect to $O(\\lambda)$.

  5. The Monk's Tale: Nero's Nets and Caesar's Father -- An Inquiry into the Transformations of Classical Roman History in Medieval Tradition

    Science.gov (United States)

    Waller, Martha S.

    1978-01-01

    Discusses the lack of consistent accuracy about historical figures in Chaucer's "Monk's Tale." The story of Nero fishing in the Tiber with golden nets is corroborated by many other ancient and medieval authors; however, the reference to Julius Caesar as being of lowly birth is peculiar only to Chaucer and a few medieval English authors.…

  6. COINFECTION OF CALIFORNIA SEA LION ADENOVIRUS 1 AND A NOVEL POLYOMAVIRUS IN A HAWAIIAN MONK SEAL (NEOMONACHUS SCHAUINSLANDI).

    Science.gov (United States)

    Cortés-Hinojosa, Galaxia; Doescher, Bethany; Kinsel, Michael; Lednicky, John; Loeb, Julia; Waltzek, Thomas; Wellehan, James F X

    2016-06-01

    The Hawaiian monk seal (Neomonachus schauinslandi) is an endangered species. Here, we present a clinical case of a 26-yr-old male Hawaiian monk seal (HMS) kept in an aquarium with a history of intermittent anorexia and evidence of renal disease. Histologic examination revealed eosinophilic intranuclear inclusions in the liver. Conventional nested PCR protocols were used to test for viruses, and it tested positive for adenovirus and polyomavirus, and negative for herpesvirus. The adenovirus partial polymerase gene is 100% homologous to that of California sea lion adenovirus 1 (CSLAdV-1). CSLAdV-1 causes viral hepatitis in CSL, and has recently been reported in different species of otariids in an aquarium in Japan ( Otaria flavescens and Arctocephalus pusillus ) and a sequence from Spain has been submitted in NCBI as Otaria flavescens adenovirus-1. The polyomavirus in this animal is a novel virus, and is the first polyomavirus discovered in Hawaiian monk seals. This new virus is designated Hawaiian monk seal polyomavirus (HMSPyV-1), and is 83% homologous to California sea lion Polyomavirus-1 (CSLPyV-1). This is the first report of viral coinfection in a HMS and clinical significance in this case remains unclear but may be associated with advanced age.

  7. Modeling of guided circumferential SH and Lamb-type waves in open waveguides with semi-analytical finite element and Perfectly Matched Layer method

    Science.gov (United States)

    Matuszyk, Paweł J.

    2017-01-01

    The circumferential guided waves (CGW) are of increasing interest for non-destructive inspecting pipes or other cylindrical structures. If such structures are buried underground, these modes can also deliver some valuable information about the surrounding medium or the quality of the contact between the pipe and the embedding medium. Toward this goal, the detailed knowledge of the dispersive characteristics of CGW is required; henceforth, the robust numerical method has to be established, which allows for the extensive study of the propagation of these modes under different loading conditions. Mathematically, this is the problem of the propagation of guided waves in an open waveguide. This problem differs significantly from the corresponding problem of a closed waveguide both in physical and numerical aspect. The paper presents a combination of semi-analytical finite element method with Perfectly Matched Layer technique for a class of coupled acoustics/elasticity problems with application to modeling of CGW. We discuss different aspects of our algorithm and validate the proposed approach against other established methods available in the literature. The presented numerical examples positively verify the robustness of the proposed method.

  8. SOME RESULTS ON CIRCULAR PERFECT GRAPHS AND PERFECT GRAPHS

    Institute of Scientific and Technical Information of China (English)

    XU Baogang

    2005-01-01

    An r-circular coloring of a graph G is a map f from V(G) to the set of open unit intervals of an Euclidean circle of length r,such that f(u) ∩ f(v) = φ whenever uv ∈ E(G).Circular perfect graphs are defined analogously to perfect graphs by means of two parameters,the circular chromatic number and the circular clique number.In this paper,we study the properties of circular perfect graphs.We give (1) a necessary condition for a graph to be circular perfect,(2) some circular critical imperfect graphs,and (3) a characterization of graphs with the property that each of their induced subgraphs has circular clique number the same as its clique number,and then the two conjectures that are equivalent to the perfect graph conjecture.

  9. The Dual Role a Buddhist Monk Played in the American South: The Balance between Heritage and Citizenship in the Refugee Community

    Directory of Open Access Journals (Sweden)

    Daniel Rhodes

    2016-05-01

    Full Text Available Buddhist Monks in Vietnam struggle with cultural preservation differently from a monk in the U.S. where the forces of acculturation for new arrivals, often refugees, are extraordinarily overwhelming. The author provides a case study examining how Buddhist leaders engage in cultural preservation and community building in the American South. Fusing ideas of Engaged Buddhism and community building, the author will demonstrate how a Buddhist monk is able to navigate the broader American culture and assist Vietnamese immigrants and refugees to acculturate, while maintaining their own cultural heritage, beliefs and religious traditions; ultimately building a viable and sustainable Buddhist community that contributes greatly to its new host community.

  10. Lipid metabolic dose response to dietary alpha-linolenic acid in monk parrot (Myiopsitta monachus).

    Science.gov (United States)

    Petzinger, Christina; Heatley, J J; Bailey, Christopher A; Bauer, John E

    2014-03-01

    Monk parrots (Myiopsitta monachus) are susceptible to atherosclerosis, a progressive disease characterized by the formation of plaques in the arteries accompanied by underlying chronic inflammation. The family of n-3 fatty acids, especially eicosapentaenoic acid (20:5n-3, EPA) and docosahexaenoic acid (22:6n-3, DHA), have consistently been shown to reduce atherosclerotic risk factors in humans and other mammals. Some avian species have been observed to convert α-linolenic acid (18:3n-3, ALA) to EPA and DHA (Htin et al. in Arch Geflugelk 71:258-266, 2007; Petzinger et al. in J Anim Physiol Anim Nutr, 2013). Therefore, the metabolic effects of including flaxseed oil, as a source of ALA, in the diet at three different levels (low, medium, and high) on the lipid metabolism of Monk parrots was evaluated through measuring plasma total cholesterol (TC), free cholesterol (FC), triacylglycerols (TAG), and phospholipid fatty acids. Feed intake, body weight, and body condition score were also assessed. Thus the dose and possible saturation response of increasing dietary ALA at constant linoleic acid (18:2n-6, LNA) concentration on lipid metabolism in Monk parrots (M. monachus) was evaluated. Calculated esterified cholesterol in addition to plasma TC, FC, and TAG were unaltered by increasing dietary ALA. The high ALA group had elevated levels of plasma phospholipid ALA, EPA, and docosapentaenoic acid (DPAn-3, 22:5n-3). The medium and high ALA groups had suppressed plasma phospholipid 20:2n-6 and adrenic acid (22:4n-6, ADA) compared to the low ALA group. When the present data were combined with data from a previous study (Petzinger et al. in J Anim Physiol Anim Nutr, 2013) a dose response to dietary ALA was observed when LNA was constant. Plasma phospholipid ALA, EPA, DPAn-3, DHA, and total n-3 were positively correlated while 20:2n-6, di-homo-gamma-linoleic acid (20:3n-6Δ7), arachidonic acid (20:4n-6), ADA, and total n-6 were inversely correlated with dietary en% ALA.

  11. HODSONG: A MONASTERY RITUAL FOR A LOCAL WISDOM CEREMONY FOR THE MONK RANKING

    Directory of Open Access Journals (Sweden)

    Theerapong Meethaisong

    2013-01-01

    Full Text Available The ranking order of monk in Isan, Thailand was influenced mostly from Buddhist believe and practices starting from Lanchang period and this religious believe become the common practices and the tool for local community in strengthening harmony and unity. One of the important religious ceremony calls Hodsong ceremony. The research area covered Maha Sarakham, Roi Et and Kalasin provinces which there are many Monk’s hierarchy ceremony. The research procedure used the qualitative research methodology. Data were collected from related literature and field studies using interviews and focus group discussion from a group of totally 66 informants. The findings were presented by means of a descriptive analysis. This research finds; Hodsong ceremony of Isan people was evidentially found since Dvaravati period, Sukhothai (Lanna, Lan Chang, Ayuthaya, Thonburi and Rattanakosin period. It was approved from different archeological sites such as Prathat Yakhu, Um Yakhu and the other kind of evident as has been recognized as a position or ranking such as Ratchakhru and Lakkham for instance. In addition, there were some equipment that was involved within this ceremony such as the water tube or Honghod were found at Wat Wichunrat and Wat Chiangthong, including different temple in Isan. The Laab or Supannabat (a golden plate used for in scripted manuscript was rarely found,and most of remains were reproduced. Hodsong ceremony is a religious tradition of Isan people that combined the ritual and believe together. Currently, Local Isan people still practice this ceremony in some communities with the 8 steps of preparation of instruments, Hodsong ornaments the itinerary order of the ceremony the ceremonial location the establishing ritual Baisri setting Sootkhwanbaisri or morale setting consoling and tied arms tradition. In addition, this ceremony involved with believers of direction and occasion from traditional beliefs. Despite, there were some problems such as

  12. Perfect simulation of Hawkes processes

    DEFF Research Database (Denmark)

    Møller, Jesper; Rasmussen, Jakob Gulddahl

    2005-01-01

    Our objective is to construct a perfect simulation algorithm for unmarked and marked Hawkes processes. The usual straightforward simulation algorithm suffers from edge effects, whereas our perfect simulation algorithm does not. By viewing Hawkes processes as Poisson cluster processes and using...

  13. Partially locally rotationally symmetric perfect fluid cosmologies

    CERN Document Server

    Mustapha, N; Van Elst, H; Marklund, M; Mustapha, Nazeem; Ellis, George F R; Elst, Henk van; Marklund, Mattias

    2000-01-01

    We show that there are no new consistent perfect fluid cosmologies with the kinematic variables and the electric and magnetic parts of the Weyl curvature all rotationally symmetric about a common axis in an open neighbourhood ${\\cal U}$ of an event. The consistent solutions of this kind are either locally rotationally symmetric, or are subcases of the Szekeres model.

  14. The Binary Perfect Phylogeny with Persistent characters

    CERN Document Server

    Braghin, Chiara; Trucco, Gabriella; Bonizzoni, Paola

    2011-01-01

    The near-perfect phylogeny over binary set of characters has been proposed as an extension of the too restrictive model of the perfect phylogeny in order to model biological events such as homoplasy. However the model appears to be too general to model some situations and is computationally inefficient on some instances. In this paper we consider the problem of reconstructing a near-perfect phylogeny where only a type of homoplasy is allowed in the tree: we consider back mutations according to notion of {\\em persistency}, that is characters can be gained and lost at most once. The notion of persistency leads to the problem of the Persistent Perfect Phylogeny (referred as P-PPH). By exploring combinatorial properties of the problem we develop an exact algorithm for solving the P-PPH problem that in the worst case runs in time that is exponential in the number of characters, but is polynomial in the number of species. Indeed, we show that the P-PPH problem can be restated as a special case of the Incomplete Per...

  15. Perfectly secure message transmission in two rounds

    NARCIS (Netherlands)

    G. Spini (Gabriele); Zémor, G (Gilles); M. Hirt; A. Smith

    2016-01-01

    textabstractIn the model that has become known as "Perfectly Secure Message Transmission"(PSMT), a sender Alice is connected to a receiver Bob through n parallel two-way channels. A computationally unbounded adversary Eve controls t of these channels, meaning she can acquire and alter any data that

  16. Perfect drain for the Maxwell Fish Eye lens

    CERN Document Server

    Gonzalez, Juan C; Minano, Juan C

    2010-01-01

    Perfect imaging for electromagnetic waves using the Maxwell Fish Eye (MFE) requires a new concept: the perfect drain. From the mathematical point of view, a perfect point drain is just like an ideal point source, except that it drains power from the electromagnetic field instead of generating it. We show here that the perfect drain for the MFE can be seen as a dissipative region the diameter of which tends to zero. The complex permittivity $\\varepsilon$ of this region cannot take arbitrary values, however, since it depends on the size of the drain as well as on the frequency. This interpretation of the perfect drain connects well with central concepts of electromagnetic theory. This opens up both the modeling in computer simulations and the experimental verification of the perfect drain.

  17. HMSRP Hawaiian Monk Seal Specimen Data (includes physical specimens, collection information, status, storage locations, and laboratory results associated with individual specimens)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set includes physical specimens, paper logs and Freezerworks database of all logged information on specimens collected from Hawaiian monk seals since 1975....

  18. Perfect Phylogeny Problems with Missing Values.

    Science.gov (United States)

    Kirkpatrick, Bonnie; Stevens, Kristian

    2014-01-01

    The perfect phylogeny problem is of central importance to both evolutionary biology and population genetics. Missing values are a common occurrence in both sequence and genotype data, but they make the problem of finding a perfect phylogeny NPhard even for binary characters. We introduce new and efficient perfect phylogeny algorithms for broad classes of binary and multistate data with missing values. Specifically, we address binary missing data consistent with the rich data hypothesis (RDH) introduced by Halperin and Karp and give an efficient algorithm for enumerating phylogenies. This algorithm is useful for computing the probability of data with missing values under the coalescent model. In addition, we use the partition intersection (PI) graph and chordal graph theory to generalize the RDH to multi-state characters with missing values. For a bounded number of states, we provide a fixed parameter tractable algorithm for the perfect phylogeny problem with missing data. Utilizing the PI graph, we are able to show that under multiple biologically motivated models for character data, our generalized RDH holds with high probability, and we evaluate our results with extensive empirical analysis.

  19. Explaining evolution via constrained persistent perfect phylogeny.

    Science.gov (United States)

    Bonizzoni, Paola; Carrieri, Anna Paola; Della Vedova, Gianluca; Trucco, Gabriella

    2014-01-01

    The perfect phylogeny is an often used model in phylogenetics since it provides an efficient basic procedure for representing the evolution of genomic binary characters in several frameworks, such as for example in haplotype inference. The model, which is conceptually the simplest, is based on the infinite sites assumption, that is no character can mutate more than once in the whole tree. A main open problem regarding the model is finding generalizations that retain the computational tractability of the original model but are more flexible in modeling biological data when the infinite site assumption is violated because of e.g. back mutations. A special case of back mutations that has been considered in the study of the evolution of protein domains (where a domain is acquired and then lost) is persistency, that is the fact that a character is allowed to return back to the ancestral state. In this model characters can be gained and lost at most once. In this paper we consider the computational problem of explaining binary data by the Persistent Perfect Phylogeny model (referred as PPP) and for this purpose we investigate the problem of reconstructing an evolution where some constraints are imposed on the paths of the tree. We define a natural generalization of the PPP problem obtained by requiring that for some pairs (character, species), neither the species nor any of its ancestors can have the character. In other words, some characters cannot be persistent for some species. This new problem is called Constrained PPP (CPPP). Based on a graph formulation of the CPPP problem, we are able to provide a polynomial time solution for the CPPP problem for matrices whose conflict graph has no edges. Using this result, we develop a parameterized algorithm for solving the CPPP problem where the parameter is the number of characters. A preliminary experimental analysis shows that the constrained persistent perfect phylogeny model allows to explain efficiently data that do not

  20. A Perfectly Matched Layer for Peridynamics in Two Dimensions

    Science.gov (United States)

    2013-04-01

    perfectly bonded carbon nanotube in polymer composites KHONDAKER SAKIL AHMED and ANG KOK KENG 753 A perfectly matched layer for peridynamics in two...der Waals forces on increasing the strength and toughness in dynamic fracture of nanofibre networks: a peridynamic approach”, Model. Simul. Mater. Sci

  1. Characterisation of orthogonal perfect fluid cosmological spacetimes

    CERN Document Server

    Dadhich, N K; Govinder, K S; Leach, P G L; Dadhich, Naresh; Patel, L K; Govinder, K S; Leach, P G L

    1994-01-01

    We consider the general orthogonal metric separable in space and time variables in comoving coordinates. We then characterise perfect fluid models admitted by such a metric. It turns out that the homogeneous models can only be either FLRW or Bianchi I while the inhomogeneous ones can only admit G_2 (two mutually as well as hypersurface orthogonal spacelike Killing vectors) isometry. The latter can possess singularities of various kinds or none. The non-singular family is however unique and cylindrically symmetric.

  2. Myth of the Perfect Family

    Science.gov (United States)

    ... Spread the Word Shop AAP Find a Pediatrician Family Life Medical Home Family Dynamics Adoption & Foster Care ... Español Text Size Email Print Share The "Perfect" Family Page Content Article Body Is there such a ...

  3. Perfect imaging with geodesic waveguides

    Science.gov (United States)

    Miñano, Juan C.; Benítez, Pablo; González, Juan C.

    2010-12-01

    Transformation optics is used to prove that a spherical waveguide filled with an isotropic material with radial refractive index n=1/r has radially polarized modes (i.e. the electric field is only radial) with the same perfect focusing properties as the Maxwell fish-eye (MFE) lens. An approximate version of that device, comprising a thin waveguide with a homogeneous core, paves the way to experimentally attaining perfect imaging in the MFE lens.

  4. Perfect Actions with Chemical Potential

    CERN Document Server

    Bietenholz, W

    1998-01-01

    We show how to include a chemical potential \\mu in perfect lattice actions. It turns out that the standard procedure of multiplying the quark fields \\Psi, an example, the case of free fermions with chemical potential is worked out explicitly. Even after truncation, cut-off effects in the pressure and the baryon density are small. Using a (quasi-)perfect action, numerical QCD simulations for non-zero chemical potential become more powerful, because coarse lattices are sufficient for extracting continuum physics.

  5. The Perfect Science Machine

    Science.gov (United States)

    2008-05-01

    ESO celebrates 10 years since First Light of the VLT Today marks the 10th anniversary since First Light with ESO's Very Large Telescope (VLT), the most advanced optical telescope in the world. Since then, the VLT has evolved into a unique suite of four 8.2-m Unit Telescopes (UTs) equipped with no fewer than 13 state-of-the-art instruments, and four 1.8-m moveable Auxiliary Telescopes (ATs). The telescopes can work individually, and they can also be linked together in groups of two or three to form a giant 'interferometer' (VLTI), allowing astronomers to see details corresponding to those from a much larger telescope. Green Flash at Paranal ESO PR Photo 16a/08 The VLT 10th anniversary poster "The Very Large Telescope array is a flagship facility for astronomy, a perfect science machine of which Europe can be very proud," says Tim de Zeeuw, ESO's Director General. "We have built the most advanced ground-based optical observatory in the world, thanks to the combination of a long-term adequately-funded instrument and technology development plan with an approach where most of the instruments were built in collaboration with institutions in the member states, with in-kind contributions in labour compensated by guaranteed observing time." Sitting atop the 2600m high Paranal Mountain in the Chilean Atacama Desert, the VLT's design, suite of instruments, and operating principles set the standard for ground-based astronomy. It provides the European scientific community with a telescope array with collecting power significantly greater than any other facilities available at present, offering imaging and spectroscopy capabilities at visible and infrared wavelengths. Blue Flash at Paranal ESO PR Photo 16b/08 A Universe of Discoveries The first scientifically useful images, marking the official 'First Light' of the VLT, were obtained on the night of 25 to 26 May 1998, with a test camera attached to "Antu", Unit Telescope number 1. They were officially presented to the press on

  6. Genetic evidence for high propagule pressure and long-distance dispersal in monk parakeet (Myiopsitta monachus) invasive populations.

    Science.gov (United States)

    Gonçalves da Silva, Anders; Eberhard, Jessica R; Wright, Timothy F; Avery, Michael L; Russello, Michael A

    2010-08-01

    The monk parakeet (Myiopsitta monachus) is a successful invasive species that does not exhibit life history traits typically associated with colonizing species (e.g., high reproductive rate or long-distance dispersal capacity). To investigate this apparent paradox, we examined individual and population genetic patterns of microsatellite loci at one native and two invasive sites. More specifically, we aimed at evaluating the role of propagule pressure, sexual monogamy and long-distance dispersal in monk parakeet invasion success. Our results indicate little loss of genetic variation at invasive sites relative to the native site. We also found strong evidence for sexual monogamy from patterns of relatedness within sites, and no definite cases of extra-pair paternity in either the native site sample or the examined invasive site. Taken together, these patterns directly and indirectly suggest that high propagule pressure has contributed to monk parakeet invasion success. In addition, we found evidence for frequent long-distance dispersal at an invasive site (approximately 100 km) that sharply contrasted with previous estimates of smaller dispersal distance made in the native range (approximately 2 km), suggesting long-range dispersal also contributes to the species' spread within the United States. Overall, these results add to a growing body of literature pointing to the important role of propagule pressure in determining, and thus predicting, invasion success, especially for species whose life history traits are not typically associated with invasiveness.

  7. Perfect and Imperfect Gauge Fixing

    CERN Document Server

    Shirzad, A

    2006-01-01

    Gauge fixing may be done in different ways. We show that using the chain structure to describe a constrained system, enables us to use either a perfect gauge, in which all gauged degrees of freedom are determined; or an imperfect gauge, in which some first class constraints remain as subsidiary conditions to be imposed on the solutions of the equations of motion. We also show that the number of constants of motion depends on the level in a constraint chain in which the gauge fixing condition is imposed. The relativistic point particle, electromagnetism and the Polyakov string are discussed as examples and perfect or imperfect gauges are distinguished.

  8. Perfect simulation of Vervaat perpetuities

    CERN Document Server

    Fill, James Allen

    2009-01-01

    We use coupling into and from the past to sample perfectly in a simple and provably fast fashion from the Vervaat family of perpetuities. The family includes the Dickman distribution, which arises both in number theory and in the analysis of the Quickselect algorithm, which was the motivation for our work.

  9. Conditions for $\\beta$-perfectness

    NARCIS (Netherlands)

    Keijsper, J.C.M.; Tewes, M.

    2000-01-01

    A $\\beta$-perfect graph is a simple graph $G$ such that $\\chi(G')=\\beta(G')$ for every induced subgraph $G'$ of $G$, where $\\chi(G')$ is the chromatic number of $G'$, and $\\beta(G')$ is defined as the maximum over all induced subgraphs $H$ of $G'$ of the minimum vertex degree in $H$. The vertices of

  10. Perfect NIZK with Adaptive Soundness

    NARCIS (Netherlands)

    Abe, M.; Fehr, S.

    2007-01-01

    This paper presents a very simple and efficient adaptively-sound perfect NIZK argument system for any NP-language. In contrast to recently proposed schemes by Groth, Ostrovsky and Sahai, our scheme does not pose any restriction on the statements to be proven. Besides, it enjoys a number of desirable

  11. THE INFLUENCE OF MONK EQUIPPED PONDS ON THE QUALITY OF BASIN HEAD STREAMS, THE EXAMPLE OF WATER TEMPERATURE IN LIMOUSIN AND BERRY (FRANCE

    Directory of Open Access Journals (Sweden)

    Laurent TOUCHART

    2010-12-01

    Full Text Available In the centre-west regions of France, the deep water outlet system known as a “monk” is used in 13% of bodies of water. The authorities are strongly encouraging this to increase, arguing that this system would reduce pond induced warming of the hydrographical network. We have measured the water temperature in four monk equipped ponds for 13 years to such an extent that this paper draws on an analysis of 142,200 original measurements. Compared to a surface outflow, a monk is a system which shifts the warming of the emissary water course to the end of summer and the autumn which reduces average annual warming by about 1°C. This reduces the heating of diurnal maxima but increases warming of the minima. A monk equipped pond warms the river with deep water which has acquired its heat by mechanical convection generated by the wind, as opposed to a weir equipped pond which provides surface water warmed by insolation. In winter the monk equipped pond does not damage the thermal living conditions for Fario trout embryos and larvae under the gravel. In summer, the monk prevents night time cooling of the emissary and increases the temperature of the minima excessively for sensitive species.

  12. Solute drag on perfect and extended dislocations

    Science.gov (United States)

    Sills, R. B.; Cai, W.

    2016-04-01

    The drag force exerted on a moving dislocation by a field of mobile solutes is studied in the steady state. The drag force is numerically calculated as a function of the dislocation velocity for both perfect and extended dislocations. The sensitivity of the non-dimensionalized force-velocity curve to the various controlling parameters is assessed, and an approximate analytical force-velocity expression is given. A non-dimensional parameter S characterizing the strength of the solute-dislocation interaction, the background solute fraction ?, and the dislocation character angle ?, are found to have the strongest influence on the force-velocity curve. Within the model considered here, a perfect screw dislocation experiences no solute drag, but an extended screw dislocation experiences a non-zero drag force that is about 10 to 30% of the drag on an extended edge dislocation. The solutes can change the spacing between the Shockley partials in both stationary and moving extended dislocations, even when the stacking fault energy remains unaltered. Under certain conditions, the solutes destabilize an extended dislocation by either collapsing it into a perfect dislocation or causing the partials to separate unboundedly. It is proposed that the latter instability may lead to the formation of large faulted areas and deformation twins in low stacking fault energy materials containing solutes, consistent with experimental observations of copper and stainless steel containing hydrogen.

  13. Visible light broadband perfect absorbers

    Energy Technology Data Exchange (ETDEWEB)

    Jia, X. L.; Meng, Q. X.; Yuan, C. X.; Zhou, Z. X.; Wang, X. O., E-mail: wxo@hit.edu.cn [School of Science, Harbin Institute of Technology, Harbin 150001 (China)

    2016-03-15

    The visible light broadband perfect absorbers based on the silver (Ag) nano elliptical disks and holes array are studied using finite difference time domain simulations. The semiconducting indium silicon dioxide thin film is introduced as the space layer in this sandwiched structure. Utilizing the asymmetrical geometry of the structures, polarization sensitivity for transverse electric wave (TE)/transverse magnetic wave (TM) and left circular polarization wave (LCP)/right circular polarization wave (RCP) of the broadband absorption are gained. The absorbers with Ag nano disks and holes array show several peaks absorbance of 100% by numerical simulation. These simple and flexible perfect absorbers are particularly desirable for various potential applications including the solar energy absorber.

  14. Effective perfect fluids in cosmology

    Energy Technology Data Exchange (ETDEWEB)

    Ballesteros, Guillermo [Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Piazza del Viminale 1, I-00184 Rome (Italy); Bellazzini, Brando, E-mail: guillermo.ballesteros@unige.ch, E-mail: brando.bellazzini@pd.infn.it [Dipartimento di Fisica, Università di Padova and INFN, Sezione di Padova, Via Marzolo 8, I-35131 Padova (Italy)

    2013-04-01

    We describe the cosmological dynamics of perfect fluids within the framework of effective field theories. The effective action is a derivative expansion whose terms are selected by the symmetry requirements on the relevant long-distance degrees of freedom, which are identified with comoving coordinates. The perfect fluid is defined by requiring invariance of the action under internal volume-preserving diffeomorphisms and general covariance. At lowest order in derivatives, the dynamics is encoded in a single function of the entropy density that characterizes the properties of the fluid, such as the equation of state and the speed of sound. This framework allows a neat simultaneous description of fluid and metric perturbations. Longitudinal fluid perturbations are closely related to the adiabatic modes, while the transverse modes mix with vector metric perturbations as a consequence of vorticity conservation. This formalism features a large flexibility which can be of practical use for higher order perturbation theory and cosmological parameter estimation.

  15. Parents' and children's acceptance of skim chocolate milks sweetened by monk fruit and stevia leaf extracts.

    Science.gov (United States)

    Li, X E; Lopetcharat, K; Drake, M A

    2015-05-01

    Chocolate milk increases milk consumption of children, but high sugar content raises health concerns. Interest in sugar reduction and parents' preference for natural sweeteners necessitates further research on natural nonnutritive sweeteners. However, it is important to maintain consumer acceptability, especially for children, while reducing sugar in chocolate milk. The objectives of this study were to identify the sweetness intensity perception of stevia leaf (STV) and monk fruit (MK) extracts in skim chocolate milk (SCM), to evaluate STV and MK as the sole or partial sweetener source for SCM for young adults (19 to 35 y) and children (5 to 13 y), and to determine if information on natural nonnutritive sweeteners impacted parents' acceptability of SCM. Power function and 2-alternative forced choice studies were used to determine the iso-sweetness of nonnutritive sweeteners to a sucrose control in SCM (51.4 g/L, SUC control). Young adults (n = 131) evaluated 9 different SCM (SUC control, STV, MK, STV:sucrose blends, or MK:sucrose blends) in a completely randomized 2-d test. Children (n = 167) evaluated SUC control SCM and SCM with 39.7 g/L sucrose and 46 mg/L MK (MK25) or 30 mg/L STV (STV25). Parents evaluated SUC control, MK25, and STV25 in a balanced crossover design with a 40-d wait time between primed or unprimed ballots. Chocolate milks solely sweetened by nonnutritive sweeteners were less acceptable compared with SUC control by young adults. MK25 and STV25 were acceptable by young adults and children. The presentation of chocolate milk label information had different effects on parental acceptance. Traditional parents preferred sucrose sweetened SCM, and label conscious parents preferred SCM with natural nonnutritive sweeteners. © 2015 Institute of Food Technologists®

  16. METHODS FOR PERFECTING PRESENTATION SKILLS

    OpenAIRE

    Daniela N. Ilieva - Koleva

    2014-01-01

    Presentation skills are crucial for the nowadays managers and business people. This article aims to examine different traditional and unconventional methods for enhancing and perfecting presentation skills. It provides suggestions on how to structure a presentation, what type of verbal language to include, and pays significant attention to body language during presentations, as well as to the relation between the presenter and the audience. The paper highlights a variety of instruments and te...

  17. Multiple Beamforming with Perfect Coding

    CERN Document Server

    Li, Boyu

    2011-01-01

    In Singular Value Decomposition (SVD) beamforming, without channel coding, there is a trade-off between full diversity and full multiplexing. Adding channel coding, full diversity and full multiplexing can be both achieved, as long as the code rate Rc and the number of subchannels S satisfy RcS1. Recently discovered Perfect Space-Time Block Codes (PSTBCs) are full-rate full-diversity space-time codes, achieving maximum coding gain. In this paper, two novel techniques, Perfect Coded Multiple Beamforming (PCMB) and Bit-Interleaved Coded Multiple Beamforming with Perfect Coding (BICMB-PC), are proposed, employing PSTBCs. PCMB achieves full diversity, full multiplexing, and full rate simultaneously, and its performance is close to PSTBC and FPMB, while the decoding complexity is significantly less than PSTBC and much lower than FPMB of dimensions 2 and 4. On the other hand, BICMB-PC achieves both full diversity and full multiplexing, and its performance is similar to BICMB-FP, but provides much lower decoding com...

  18. Perfect orderings on Bratteli diagrams

    CERN Document Server

    Bezuglyi, Sergey; Yassawi, Reem

    2012-01-01

    Given a Bratteli diagram B, we study the set O(B) of all possible orderings w on a Bratteli diagram B and its subset P(B) consisting of `perfect' orderings that produce Bratteli-Vershik dynamical systems (Vershik maps). We give necessary and sufficient conditions for w to be perfect. On the other hand, a wide class of non-simple Bratteli diagrams that do not admit Vershik maps is explicitly described. In the case of finite rank Bratteli diagrams, we show that the existence of perfect orderings with a prescribed number of extreme paths affects significantly the values of the entries of the incidence matrices and the structure of the diagram B. Endowing the set O(B) with product measure, we prove that there is some j such that almost all orderings on B have j maximal and minimal paths, and that if j is strictly greater than the number of minimal components that B has, then almost all orderings are imperfect.

  19. The Perfect Quark-Gluon Vertex Function

    CERN Document Server

    Orginos, K; Brower, Richard C; Chandrasekharan, S; Wiese, U J

    1998-01-01

    We evaluate a perfect quark-gluon vertex function for QCD in coordinate space and truncate it to a short range. We present preliminary results for the charmonium spectrum using this quasi-perfect action.

  20. Time-machine in Perfect Fluid Cosmologies

    Institute of Scientific and Technical Information of China (English)

    DUAN Yan-zhi

    2009-01-01

    This letter investigates the time-machine problem in perfect fluid cosmologies. It solves the Einstein's field equations with the energy-momentum tensors for perfect fluid and constructs a class of time-machine solutions,by which the time-machine problem in the perfect fluid cosmologies is solved.

  1. Monte Carlo modeling and analyses of YALINA-booster subcritical assembly part 1: analytical models and main neutronics parameters.

    Energy Technology Data Exchange (ETDEWEB)

    Talamo, A.; Gohar, M. Y. A.; Nuclear Engineering Division

    2008-09-11

    This study was carried out to model and analyze the YALINA-Booster facility, of the Joint Institute for Power and Nuclear Research of Belarus, with the long term objective of advancing the utilization of accelerator driven systems for the incineration of nuclear waste. The YALINA-Booster facility is a subcritical assembly, driven by an external neutron source, which has been constructed to study the neutron physics and to develop and refine methodologies to control the operation of accelerator driven systems. The external neutron source consists of Californium-252 spontaneous fission neutrons, 2.45 MeV neutrons from Deuterium-Deuterium reactions, or 14.1 MeV neutrons from Deuterium-Tritium reactions. In the latter two cases a deuteron beam is used to generate the neutrons. This study is a part of the collaborative activity between Argonne National Laboratory (ANL) of USA and the Joint Institute for Power and Nuclear Research of Belarus. In addition, the International Atomic Energy Agency (IAEA) has a coordinated research project benchmarking and comparing the results of different numerical codes with the experimental data available from the YALINA-Booster facility and ANL has a leading role coordinating the IAEA activity. The YALINA-Booster facility has been modeled according to the benchmark specifications defined for the IAEA activity without any geometrical homogenization using the Monte Carlo codes MONK and MCNP/MCNPX/MCB. The MONK model perfectly matches the MCNP one. The computational analyses have been extended through the MCB code, which is an extension of the MCNP code with burnup capability because of its additional feature for analyzing source driven multiplying assemblies. The main neutronics parameters of the YALINA-Booster facility were calculated using these computer codes with different nuclear data libraries based on ENDF/B-VI-0, -6, JEF-2.2, and JEF-3.1.

  2. %159300 MUSICAL PERFECT PITCH [OMIM

    Lifescience Database Archive (English)

    Full Text Available e-recognition capacity and musical exposure and training, as well as demographic characteristics. The subjec...ts were selected from the musical communities of 4 large metropolitan areas. Perfect pitch was found to pred...fect pitch.) See 191200 for a discussion of a form of lack of musical ability, tune deafness. Schlaug et al....aterability in 30 healthy, right-handed professional musicians and compared the r...esults with those from nonmusicians matched for age, sex, and handedness. They found that musicians with per

  3. Almost-perfect secret sharing

    CERN Document Server

    Kaced, Tarik

    2011-01-01

    Splitting a secret s between several participants, we generate (for each value of s) shares for all participants. The goal: authorized groups of participants should be able to reconstruct the secret but forbidden ones get no information about it. In this paper we introduce several notions of non- perfect secret sharing, where some small information leak is permitted. We study its relation to the Kolmogorov complexity version of secret sharing (establishing some connection in both directions) and the effects of changing the secret size (showing that we can decrease the size of the secret and the information leak at the same time).

  4. Uncover the Mysterious Veil of Tibetan Monks Debate%揭开藏僧辩经的神秘面纱

    Institute of Scientific and Technical Information of China (English)

    白玛代青

    2013-01-01

      Simply introduces the process and procedures of the Tibetan Buddhist monks debate, The debate ceremony as well as the body movements and emotions. With the extensive use of the methods and ideas of Anthropology, describes the rules and order and emotional adjustment methods, habits of the people and the function of the debate.In Tibetan Buddhist monks debate, we can see their unbelievable active thinking. this kind of teaching and the unique study methodin is rare outside Tibetan areas. Almost all Tibetan areas identified by the school are opened logic course which as the basic subject of learning other courses has a very important role.%  在藏区的辩经学院中,辩经是学习佛法的一种最为重要的途径。它在僧人的学习过程中是不可或缺的。简单地介绍了藏传佛教僧人辩经的过程和程序,辩经的仪式以及辩论中的身体动作和情绪等。大量利用了人类学的方法和思路,对辩经中遵循的规则和秩序以及人物情绪调整的方法和习性、辩论功能进行了描述。

  5. Renegotiation Perfection in Infinite Games

    Directory of Open Access Journals (Sweden)

    Julian C. Jamison

    2014-01-01

    Full Text Available We study the dynamic structure of equilibria in game theory. Allowing players in a game the opportunity to renegotiate, or switch to a feasible and Pareto superior equilibrium, can lead to welfare gains. However, in an extensive-form game this can also make it more difficult to enforce punishment strategies, leading to the question of which equilibria are feasible after all. This paper attempts to resolve that question by presenting the first definition of renegotiation-proofness in general games. This new concept, the renegotiation perfect set, satisfies five axioms. The first three axioms—namely Rationality, Consistency, and Internal Stability—characterize weakly renegotiation-proof sets. There is a natural generalized tournament defined on the class of all WRP sets, and the final two axioms—External Stability and Optimality—pick a unique “winner” from this tournament. The tournament solution concept employed, termed the catalog, is based on Dutta’s minimal covering set and can be applied to many settings other than renegotiation. It is shown that the renegotiation perfection concept is an extension of the standard renegotiation-proof definition for finite games, introduced by (Benoit and Krishna 1993, and that it captures the notion of a strongly renegotiation-proof equilibrium as defined by (Farrell and Maskin 1989.

  6. The pursuit of perfect packing

    CERN Document Server

    Weaire, Denis

    2000-01-01

    In 1998 Thomas Hales dramatically announced the solution of a problem that has long teased eminent mathematicians: what is the densest possible arrangement of identical spheres? The Pursuit of Perfect Packing recounts the story of this problem and many others that have to do with packing things together. The examples are taken from mathematics, physics, biology, and engineering, including the arrangement of soap bubbles in foam, atoms in a crystal, the architecture of the bee''s honeycomb, and the structure of the Giant''s Causeway. Using an informal style and with key references, the book also includes brief accounts of the lives of many of the scientists who devoted themselves to problems of packing over many centuries, together with wry comments on their efforts. It is an entertaining introduction to the field for both specialists and the more general public.

  7. Electromagnetic Detection of a Perfect Carpet Cloak

    Science.gov (United States)

    Shi, Xihang; Gao, Fei; Lin, Xiao; Zhang, Baile

    2015-01-01

    It has been shown that a spherical invisibility cloak originally proposed by Pendry et al. can be electromagnetically detected by shooting a charged particle through it, whose underlying mechanism stems from the asymmetry of transformation optics applied to motions of photons and charges [PRL 103, 243901 (2009)]. However, the conceptual three-dimensional invisibility cloak that exactly follows specifications of transformation optics is formidably difficult to implement, while the simplified cylindrical cloak that has been experimentally realized is inherently visible. On the other hand, the recent carpet cloak model has acquired remarkable experimental development, including a recently demonstrated full-parameter carpet cloak without any approximation in the required constitutive parameters. In this paper, we numerically investigate the electromagnetic radiation from a charged particle passing through a perfect carpet cloak and propose an experimentally verifiable model to demonstrate symmetry breaking of transformation optics. PMID:25997798

  8. Overemphasis on Perfectly Competitive Markets in Microeconomics Principles Textbooks

    Science.gov (United States)

    Hill, Roderick; Myatt, Anthony

    2007-01-01

    Microeconomic principles courses focus on perfectly competitive markets far more than other market structures. The authors examine five possible reasons for this but find none of them sufficiently compelling. They conclude that textbook authors should place more emphasis on how economists select appropriate models and test models' predictions…

  9. Truncated Perfect Actions for Staggered Fermions

    CERN Document Server

    Bietenholz, W

    1998-01-01

    We discuss the behavior of free perfect staggered fermions and truncated versions thereof. The study includes flavor non-degenerate masses. We suggest a new blocking scheme, which provides excellent locality of the perfect lattice action. A truncation procedure adequate for the structure of staggered fermions is applied. We consider spectral and thermodynamic properties and compare truncated perfect actions, Symanzik improved and standard staggered fermions in two and four dimensions.

  10. Perfect Lattice Actions for Staggered Fermions

    CERN Document Server

    Bietenholz, W; Chandrasekharan, S; Wiese, U J

    1996-01-01

    We construct a perfect lattice action for staggered fermions by blocking from the continuum. The locality, spectrum and pressure of such perfect staggered fermions are discussed. We also derive a consistent fixed point action for free gauge fields and discuss its locality as well as the resulting static quark-antiquark potential. This provides a basis for the construction of (classically) perfect lattice actions for QCD using staggered fermions.

  11. Perfect competition according to Enrico Barone

    OpenAIRE

    Manuela Mosca; Michael E. Bradley

    2013-01-01

    The Italian economist Enrico Barone (1859- 1924) is best known for his contributions to marginal productivity theory and the socialist planning debate. This paper analyzes Barone’s contributions to the theory of perfect competition which are largely ignored in the secondary literature. It includes his methodology; the definition, conditions and outcomes of perfect competition; the institutional context of perfect competition; and the adjustment process. It also includes some of Barone’s graph...

  12. Neighborhood connected perfect domination in graphs

    Directory of Open Access Journals (Sweden)

    Kulandai Vel M.P.

    2012-12-01

    Full Text Available Let $G = (V, E$ be a connected graph. A set $S$ of vertices in $G$ is a perfect dominating set if every vertex $v$ in $V-S$ is adjacent to exactly one vertex in $S$. A perfect dominating set $S$ is said to be a neighborhood connected perfect dominating set (ncpd-set if the induced subgraph $$ is connected. The minimum cardinality of a ncpd-set of $G$ is called the neighborhood connected perfect domination number of $G$ and is denoted by $\\gamma_{ncp}(G$. In this paper we initiate a study of this parameter.

  13. The right time, the right place: will targeting human cancer-associated mutations to the mouse provide the perfect preclinical model?

    Science.gov (United States)

    Blyth, Karen; Morton, Jennifer P; Sansom, Owen J

    2012-02-01

    Over the past 10 years the realisation that genetic mouse models of cancer may play a key role in preclinical drug development has gained strong momentum. Moreover sequencing studies of human tumours have provided key insights into the mutational complexity of epithelial cancer, unleashing important clues for researchers to generate accurate genetically engineered mouse (GEM) models of cancer. Thus by targeting multiple cancer associated human mutations to the appropriate murine epithelia, mice develop tumours that more closely recapitulate the human disease. As a number of excellent models now exist, the next 5-10 years will ascertain whether these models will predict response of human cancer to intervention. If so they might become the 'gold standard' where all drugs are required to be tested in mouse models of disease before proceeding into the patient. However, although this principle is very attractive, it is relatively untested and here, using examples of prevalent human cancers, we will review the latest data on preclinical GEM studies and comment on what challenges are left to overcome.

  14. Perfect Actions and Operators for Lattice QCD

    Science.gov (United States)

    Wiese, Uwe-Jens

    1996-05-01

    Wilson's renormalization group implies that lattice actions located on a renormalized trajectory emanating from a fixed point represent perfect discretizations of continuum physics. With a perfect action the spectrum of a lattice theory is identical with the one of the continuum theory even at finite lattice spacing. Similarly, perfect operators yield cut-off independent matrix elements. Hence, continuum QCD can in principle be reconstructed from a lattice with finite spacing. In practice it is difficult to construct perfect actions and perfect operators explicitly. Here perturbation theory is used to derive perfect actions for quarks and gluons by performing a block renormalization group transformation directly from the continuum. The renormalized trajectory for free massive quarks is identified and a parameter in the renormalization group transformation is tuned such that for 1-d configurations the perfect action reduces to the nearest neighbor Wilson fermion action. Then the 4-d perfect action turns out to be extremely local as well, which is vital for numerical simulations. The fixed point action for free gluons is also obtained by blocking from the continuum. For 2-d configurations it reduces to the standard plaquette action, and for 4-d configurations it is still very local. With interactions between quarks and gluons switched on the perfect quark-gluon and 3-gluon vertex functions are computed analytically. In particular, a perfect clover term can be extracted from the quark-gluon vertex. The perturbatively perfect action is directly applicable to heavy quark physics. The construction of a perfect QCD action for light quarks should include nonperturbative effects, which is possible using numerical methods. Classically perfect quark and gluon fields are constructed as well. They allow to interpolate the continuum fields from the lattice data. In this way one can obtain information about space-time regions between lattice points. The classically perfect fields

  15. Counting perfect matchings of cubic graphs in the geometric dual

    CERN Document Server

    Jiménez, Andrea

    2010-01-01

    Lov\\'asz and Plummer conjectured, in the mid 1970's, that every cubic graph G with no cutedge has an exponential in |V(G)| number of perfect matchings. In this work we show that every cubic planar graph G whose geometric dual graph is a stack triangulation has at least 3 times the golden ratio to |V(G)|/72 distinct perfect matchings. Our work builds on a novel approach relating Lov\\'asz and Plummer's conjecture and the number of so called groundstates of the widely studied Ising model from statistical physics.

  16. Perfect control of reflection and refraction using spatially dispersive metasurfaces

    CERN Document Server

    Asadchy, V S; Tcvetkova, S N; Díaz-Rubio, A; Ra'di, Y; Tretyakov, S A

    2016-01-01

    Non-uniform metasurfaces (electrically thin composite layers) can be used for shaping refracted and reflected electromagnetic waves. However, known design approaches based on the generalized refraction and reflection laws do not allow realization of perfectly performing devices: there are always some parasitic reflections into undesired directions. In this paper we introduce and discuss a general approach to the synthesis of metasurfaces for full control of transmitted and reflected fields and show that perfect performance can be realized. The method is based on the use of an equivalent impedance matrix model which connects the tangential field components at the two sides on the metasurface. With this approach we are able to understand what physical properties of the metasurface are needed in order to perfectly realize the desired response. Furthermore, we determine the required polarizabilities of the metasurface unit cells and discuss suitable cell structures. It appears that only spatially dispersive metas...

  17. Price-Value Potential for Near-Perfectly Competitive Markets

    Directory of Open Access Journals (Sweden)

    Sergey K. Aityan

    2011-01-01

    Full Text Available This study introduces price-value potential to be used instead of price for market analysis by analogy with free energy or thermodynamic potential in physics. A conservation principle is proposed for price-value potential. It is shown that price-value potential provides a constructive way for market analysis by identifying variation of equilibrium prices and quantities for different products in market equilibrium. A perturbation theory for a group of products with small differentiations on near-perfectly competitive markets was developed for illustration of the approach. The concept of price-value potential is illustrated in a simple example of a near-perfectly competitive market. It is shown that the equilibrium prices and quantities for products differ due to product differentiation that makes such an approach a constructive enhancement to the classical model of perfect competition.

  18. Perfect fluids coupled to inhomogeneities in the late Universe

    CERN Document Server

    Zhuk, Alexander

    2016-01-01

    We consider the Universe at the late stage of its evolution and deep inside the cell of uniformity. At such scales, the Universe is highly inhomogeneous and is filled with inhomogeneities in the form of galaxies and the groups of galaxies. We also suggest that the Universe is filled with a perfect fluid, and its fluctuations have peculiar velocities of the same (non-relativistic) order of magnitude as for the inhomogeneities. In this sense, the inhomogeneities (e.g. galaxies) and fluctuations of perfect fluids are coupled with each other. We clarify some important points of this approach and present a brief review of previous studies (e.g. CPL model and Chaplygin gas). We demonstrate that considered perfect fluids which satisfy our approach are really coupled to galaxies concentrating around them. The averaged (over the whole Universe) value of their fluctuations is equal to zero.

  19. Scattering by a perfect electromagnetic conductor (PEMC) plate embedded in lossy medium

    Science.gov (United States)

    Ahmed, Saeed; Khalid Khan, Muhammad; Rehman, Atta Ur

    2016-07-01

    In this article, we develop an analytic theory for a perfect electromagnetic conductor (PEMC) plate embedded in lossy medium. The duality transformation introduced by Lindell and Sihvola is applied to study the electromagnetic wave scattering by a PEMC plate. Perfect electric conductor and perfect magnetic conductor are the limiting cases of PEMC media. Here, we study monoscattering by PEMC plate embedded in four different soil models. Numerical results are discussed and compared with the available literature.

  20. Magnifying perfect lens with positive refraction

    CERN Document Server

    Tyc, Tomas

    2010-01-01

    We propose a device with a positive isotropic refractive index that creates a magnified perfect real image of an optically homogeneous three-dimensional region of space within geometrical optics. Its key ingredient is a new refractive index profile that can work as a perfect lens on its own, having a very moderate index range.

  1. A perfectness concept for multicriteria games

    NARCIS (Netherlands)

    van Megen, F.; Borm, P.E.M.; Tijs, S.H.

    1995-01-01

    This paper considers a refinement of equilibria for multicriteria games based on the perfectness concept of Selten (1975). Existence of perfect equilibrium points is shown and several characterizations are provided. Furthermore, contrary to the result for equilibria for multicriteria games, an examp

  2. A new characterization of trivially perfect graphs

    Directory of Open Access Journals (Sweden)

    Christian Rubio Montiel

    2015-03-01

    Full Text Available A graph $G$ is \\emph{trivially perfect} if for every induced subgraph the cardinality of the largest set of pairwise nonadjacent vertices (the stability number $\\alpha(G$ equals the number of (maximal cliques $m(G$. We characterize the trivially perfect graphs in terms of vertex-coloring and we extend some definitions to infinite graphs.

  3. On the Cell Probe Complexity of Membership and Perfect Hashing

    DEFF Research Database (Denmark)

    Pagh, Rasmus

    2001-01-01

    We study two fundamental static data structure problems, membership and perfect hashing, in Yao's cell probe model. The first space and bit probe optimal worst case upper bound is given for the membership problem. We also give a new efficient membership scheme where the query algorithm makes just...

  4. The perfect three: ontology as trinity

    Directory of Open Access Journals (Sweden)

    D.T. Williams

    1988-03-01

    Full Text Available The Ontological Argument fo r the existence of God is briefly examined with particular reference to its basic premise, the assumption of the perfection of God. Despite some problems with the idea, it is believed that perfection is a valid concept. The thrust of the article is that if a perfect God exists, such perfection requires at least the basic concepts of the doctrine of the Trinity . The author therefore believes th a t the idea of the Trinity is derivable in a rudimentary form without reference to either revelation or to the "vestigia" (the supposed reflection of the Trinity in the creation, but simply from the idea of perfection. Some authors, both medieval and modern are cited in support of the argument.

  5. Haplotyping as perfect phylogeny: a direct approach.

    Science.gov (United States)

    Bafna, Vineet; Gusfield, Dan; Lancia, Giuseppe; Yooseph, Shibu

    2003-01-01

    A full haplotype map of the human genome will prove extremely valuable as it will be used in large-scale screens of populations to associate specific haplotypes with specific complex genetic-influenced diseases. A haplotype map project has been announced by NIH. The biological key to that project is the surprising fact that some human genomic DNA can be partitioned into long blocks where genetic recombination has been rare, leading to strikingly fewer distinct haplotypes in the population than previously expected (Helmuth, 2001; Daly et al., 2001; Stephens et al., 2001; Friss et al., 2001). In this paper we explore the algorithmic implications of the no-recombination in long blocks observation, for the problem of inferring haplotypes in populations. This assumption, together with the standard population-genetic assumption of infinite sites, motivates a model of haplotype evolution where the haplotypes in a population are assumed to evolve along a coalescent, which as a rooted tree is a perfect phylogeny. We consider the following algorithmic problem, called the perfect phylogeny haplotyping problem (PPH), which was introduced by Gusfield (2002) - given n genotypes of length m each, does there exist a set of at most 2n haplotypes such that each genotype is generated by a pair of haplotypes from this set, and such that this set can be derived on a perfect phylogeny? The approach taken by Gusfield (2002) to solve this problem reduces it to established, deep results and algorithms from matroid and graph theory. Although that reduction is quite simple and the resulting algorithm nearly optimal in speed, taken as a whole that approach is quite involved, and in particular, challenging to program. Moreover, anyone wishing to fully establish, by reading existing literature, the correctness of the entire algorithm would need to read several deep and difficult papers in graph and matroid theory. However, as stated by Gusfield (2002), many simplifications are possible and the

  6. Is "the perfect model" really needed? - Analysis of the quality level of climate information necessary for supporting adaptation in agriculture and forestry

    Science.gov (United States)

    Gálos, Borbála; Ostler, Wolf-Uwe; Csáki, Péter; Bidló, András; Panferov, Oleg

    2016-04-01

    agriculture a questionnaire has been carried out among 180 farms of different sizes and specializations (mostly arable farming and viniculture) in Reinland-Palatine, Germany. The results show that almost all farmers use the weather information daily and are in need of weather forecast. More than a half requires also the forecast on extreme events. However the farmers require more qualitative (e.g. temperature coarser than 1°C) than high-precision quantitative information in short and medium-term forecasts. Forestry requires long-term (30-100 years) climate projections. For the assessment of climate change impacts on forest distribution, production and tree species selection, monthly temperature means and precipitation sums are sufficient. Based on the results of regional climate models it will be shown how the bias, the spread and spatial resolution of the simulation results are affecting the accuracy of impact assessments. Our analyses can help to fill the gap between climate services and the needs of impact researchers and end users in agriculture and forestry. User-relevant climate information can contribute to appropriate adaptation support services and management options in the two sectors. Keywords: regional climate projections, climate impact assessment, agriculture, forestry, adaptation support, accuracy of climate information Funding: The research is supported by the "Agroclimate-2" (VKSZ_12-1-2013-0034) joint EU-national research project.

  7. Characterizing perfect recall in Epistemic Temporal Logic

    CERN Document Server

    Witzel, Andreas

    2010-01-01

    We review the notion of perfect recall in the literature on interpreted systems, game theory, and epistemic logic. We give a (to our knowledge) novel frame condition for it, which is local and can straightforwardly be translated to a defining formula in a language that only has next-step temporal operators, such as epistemic temporal logic (ETL). It also gives rise to a complete axiomatization for S5 ETL frames with perfect recall. We then consider how to extend and consolidate the notion of perfect recall in sub-S5 settings, where the various notions discussed are no longer equivalent.

  8. Multi-channel coherent perfect absorbers

    KAUST Repository

    Bai, Ping

    2016-05-18

    The absorption efficiency of a coherent perfect absorber usually depends on the phase coherence of the incident waves on the surfaces. Here, we present a scheme to create a multi-channel coherent perfect absorber in which the constraint of phase coherence is loosened. The scheme has a multi-layer structure such that incident waves in different channels with different angular momenta can be simultaneously and perfectly absorbed. This absorber is robust in achieving high absorption efficiency even if the incident waves become "incoherent" and possess "random" wave fronts. Our work demonstrates a unique approach to designing highly efficient metamaterial absorbers. © CopyrightEPLA, 2016.

  9. Imperfect or Perfect Dynamic Bipolarity? The Case of Antonymous Affective Judgments

    Science.gov (United States)

    Vautier, Stephane; Steyer, Rolf; Jmel, Said; Raufaste, Eric

    2005-01-01

    How is affective change rated with positive adjectives such as good related to change rated with negative adjectives such as bad? Two nested perfect and imperfect forms of dynamic bipolarity are defined using latent change structural equation models based on tetrads of items. Perfect bipolarity means that latent change scores correlate -1.…

  10. Classification of eight dimensional perfect forms

    NARCIS (Netherlands)

    Dutour Sikiric, M.; Schuermann, A.; Vallentin, F.

    2007-01-01

    In this paper, we classify the perfect lattices in dimension 8. There are 10916 of them. Our classification heavily relies on exploiting symmetry in polyhedral computations. Here we describe algorithms making the classification possible.

  11. Plasmonic titanium nitride nanostructures for perfect absorbers

    DEFF Research Database (Denmark)

    Guler, Urcan; Li, Wen-Wei; Kinsey, Nathaniel

    2013-01-01

    We propose a metamaterial based perfect absorber in the visible region, and investigate the performance of titanium nitride as an alternative plasmonic material. Numerical and experimental results reveal that titanium nitride performs better than gold as a plasmonic absorbing material...

  12. Perfectivity and time reference in Hausa

    Directory of Open Access Journals (Sweden)

    Mahamane L. Abdoulaye

    2008-01-01

    Full Text Available The relative marking in Hausa marks discourse presupposition in perfective and imperfective relative clauses and out-of-focus clauses of focus and fronted wh-questions. However, the Relative Perfective also appears in storyline narrative clauses and various accounts try to find a common feature between relative clauses and narrative context. This paper rejects the common feature approach to Hausa relative marking and presents a systematic grammaticalization account of the functions of the Relative Perfective. The paper shows that in temporal when relative clauses headed by look?cin d? 'time that', the aspectual contrast Relative Imperfective vs. Relative Perfective has vanished, and the Relative Perfective indexes the specific time of the event. The temporal relative clauses differ from locative and manner adverbial relative clauses, whose semantics (location and manner are not usual inflectional categories and they therefore maintain the aspectual contrast between Relative Perfective and Relative Imperfective. The paper shows that the new temporal category, the Specific Time Marker, spread to other environments and incorporated a time orientation feature in main clauses of narrative and dialogical discourse to become a simple past. The paper proposes a mixed tense and aspect TAM system for Hausa, a system positioned between aspect-only and tense-prominent systems.

  13. Perfect commuting-operator strategies for linear system games

    Science.gov (United States)

    Cleve, Richard; Liu, Li; Slofstra, William

    2017-01-01

    Linear system games are a generalization of Mermin's magic square game introduced by Cleve and Mittal. They show that perfect strategies for linear system games in the tensor-product model of entanglement correspond to finite-dimensional operator solutions of a certain set of non-commutative equations. We investigate linear system games in the commuting-operator model of entanglement, where Alice and Bob's measurement operators act on a joint Hilbert space, and Alice's operators must commute with Bob's operators. We show that perfect strategies in this model correspond to possibly infinite-dimensional operator solutions of the non-commutative equations. The proof is based around a finitely presented group associated with the linear system which arises from the non-commutative equations.

  14. Perfect arborescence packing in preflow mincut graphs

    Energy Technology Data Exchange (ETDEWEB)

    Gabow, H.N. [Univ. of Colorado, Boulder, CO (United States)

    1996-12-31

    In a digraph with distinguished vertex a, for any vertex v {ne} a let {lambda}(v) equal the value of a maximum flow from a to v. A perfect packing of a-arborescences contains each vertex in {lambda}(v) arborescences and contains some fixed vertex in every arborescence. Determining if an arbitrary graph has a perfect packing is NP-complete. We present the most general known condition that guarantees the existence of a perfect packing: each vertex v {ne} a is separated from a by a set that has in-degree {lambda}(v) and out-degree no greater. This result is based on other useful properties of such graphs, e.g., they always have a pair of edges that can be {open_quotes}split off{close_quotes} preserving, values. We show a perfect packing can be found in O(nm{sup 2}) time, where n (m) is the number of vertices (edges). If the graph has a capacity function the time is the same as computing O(n{sup 2}) maximum network flows. We also show a preflow mincut graph has a fractional perfect packing using only m + n - 2 distinct arborescences.

  15. Adaptive perfectly matched layer for Wood's anomalies in diffraction gratings

    CERN Document Server

    Vial, Benjamin; Nicolet, André; Commandré, Mireille; Tisserand, Stéphane

    2015-01-01

    We propose an Adaptive Perfectly Matched Layer (APML) to be used in diffraction grating modeling. With a properly tailored co-ordinate stretching depending both on the incident field and on grating parameters, the APML may efficiently absorb diffracted orders near grazing angles (the so-called Wood's anomalies). The new design is implemented in a finite element method (FEM) scheme and applied on a numerical example of a dielectric slit grating. Its performances are compared with classical PML with constant stretching coefficient.

  16. Perfectly matched layers for second order wave equations

    OpenAIRE

    Duru, Kenneth

    2010-01-01

    Numerical simulation of propagating waves in unbounded spatial domains is a challenge common to many branches of engineering and applied mathematics. Perfectly matched layers (PML) are a novel technique for simulating the absorption of waves in open domains. The equations modeling the dynamics of phenomena of interest are usually posed as differential equations (or integral equations) which must be solved at every time instant. In many application areas like general relativity, seismology and...

  17. The perfect family: decision making in biparental care.

    Directory of Open Access Journals (Sweden)

    Erol Akçay

    Full Text Available Previous theoretical work on parental decisions in biparental care has emphasized the role of the conflict between evolutionary interests of parents in these decisions. A prominent prediction from this work is that parents should compensate for decreases in each other's effort, but only partially so. However, experimental tests that manipulate parents and measure their responses fail to confirm this prediction. At the same time, the process of parental decision making has remained unexplored theoretically. We develop a model to address the discrepancy between experiments and the theoretical prediction, and explore how assuming different decision making processes changes the prediction from the theory.We assume that parents make decisions in behavioral time. They have a fixed time budget, and allocate it between two parental tasks: provisioning the offspring and defending the nest. The proximate determinant of the allocation decisions are parents' behavioral objectives. We assume both parents aim to maximize the offspring production from the nest. Experimental manipulations change the shape of the nest production function. We consider two different scenarios for how parents make decisions: one where parents communicate with each other and act together (the perfect family, and one where they do not communicate, and act independently (the almost perfect family.The perfect family model is able to generate all the types of responses seen in experimental studies. The kind of response predicted depends on the nest production function, i.e. how parents' allocations affect offspring production, and the type of experimental manipulation. In particular, we find that complementarity of parents' allocations promotes matching responses. In contrast, the relative responses do not depend on the type of manipulation in the almost perfect family model. These results highlight the importance of the interaction between nest production function and how parents make

  18. Subgame-perfect ϵ-equilibria in perfect information games with sigma-discrete discontinuities

    NARCIS (Netherlands)

    Flesch, Janos; Predtetchinski, Arkadi

    2016-01-01

    Multi-player perfect information games are known to admit a subgame-perfect ϵ-equilibrium, for every ϵ>0, under the condition that every player’s payoff function is bounded and continuous on the whole set of plays. In this paper, we address the question on which subsets of plays the condition of pay

  19. Overlapped optics induced perfect coherent effects

    Science.gov (United States)

    Li, Jian Jie; Zang, Xiao Fei; Mao, Jun Fa; Tang, Min; Zhu, Yi Ming; Zhuang, Song Lin

    2013-12-01

    For traditional coherent effects, two separated identical point sources can be interfered with each other only when the optical path difference is integer number of wavelengths, leading to alternate dark and bright fringes for different optical path difference. For hundreds of years, such a perfect coherent condition seems insurmountable. However, in this paper, based on transformation optics, two separated in-phase identical point sources can induce perfect interference with each other without satisfying the traditional coherent condition. This shifting illusion media is realized by inductor-capacitor transmission line network. Theoretical analysis, numerical simulations and experimental results are performed to confirm such a kind of perfect coherent effect and it is found that the total radiation power of multiple elements system can be greatly enhanced. Our investigation may be applicable to National Ignition Facility (NIF), Inertial Confined Fusion (ICF) of China, LED lighting technology, terahertz communication, and so on.

  20. Relativistic perfect fluids in local thermal equilibrium

    CERN Document Server

    Coll, Bartolomé; Sáez, Juan Antonio

    2016-01-01

    The inverse problem for conservative perfect fluid energy tensors provides a striking result. Namely that, in spite of its name, its historic origin or its usual conceptualization, the notion of {\\em local thermal equilibrium} for a perfect fluid is a {\\em purely hydrodynamic}, not thermodynamic, notion. This means that it may be thought, defined and detected using exclusively hydrodynamic quantities, without reference to temperature or any other thermodynamic concept, either of equilibrium or irreversible: a relativistic perfect fluid evolves in local thermal equilibrium if, and only if, its hydrodynamic variables evolve keeping a certain relation among them. This relation fixes, but only fixes, a precise fraction of the thermodynamics of the fluid, namely that relating the speed of its sound waves to the hydrodynamic variables. All thermodynamic schemes (sets of thermodynamic variables and their mutual relations) compatible with such a relation on the sole hydrodynamic variables are obtained. This hydrodyna...

  1. Perfect 800 Advanced Strategies for Top Students

    CERN Document Server

    Celenti, Dan

    2010-01-01

    Getting into the nation's most competitive universities requires more than a good SAT score, it requires a perfect score. Perfect 800: SAT Math gives advanced students the tools needed to master the SAT math test. Covering areas including arithmetic concepts; algebra; geometry; and additional topics such as probability and weighted average, the book offers exposure to a wide range of degrees of difficulty in a holistic approach that allows students to experience the "real thing," including the impact of time constraints on their performance. By emphasizing critical thinking and analytic skills

  2. Dynamics of non-minimally coupled perfect fluids

    CERN Document Server

    Bettoni, Dario

    2015-01-01

    We present a general formulation of the theory for a non-minimally coupled perfect fluid in which both conformal and disformal couplings are present. We discuss how such non-minimal coupling is compatible with the assumptions of a perfect fluid and derive both the Einstein and the fluid equations for such model. We found that, while the Euler equation is significantly modified with the introduction of an extra force related to the local gradients of the curvature, the continuity equation is unaltered, thus allowing for the definition of conserved quantities along the fluid flow. As an application to cosmology and astrophysics we compute the effects of the non-minimal coupling on a Friedmann--Lema\\^itre--Robertson--Walker background metric and on the Newtonian limit of our theory.

  3. 苍雪大和尚《南来堂集》辑佚∗%Poems by Monk Cangxue Not Collected in Nan Lai Tang Ji

    Institute of Scientific and Technical Information of China (English)

    王启元

    2014-01-01

    Cangxue Duche ( 1588-1656 ) composed some of the best poems among monks in the late Ming Dynasty. His poems, however, had long been circulating in hand-written copies until Nan Lai Tang Ji –Collected Poems by Master Cangxue, the best of his collected works edited by Wang Peisun, came in-to being in the era of the Republic of China ( 1912-1949 ) . By reading collected works of the contempora-ry monks of Cangxue, the present author has identified some other poems and essays not included in the a-bove mentioned collection, especially forwards Cangxue wrote for the collected works of other authors. These poems can show that Cangxue, well versed in quite a number of topics and styles, made great contri-butions to the amalgamation between the monks and the laymen.%苍雪读彻之诗为晚明诗僧中之翘楚,但其诗长期以抄本形式流传。民国王培孙先生辑校《苍雪大师南来堂诗集》为苍雪诗歌流传最佳版本。今翻检明清僧传与诗文集,另有零星苍雪之作存世,尤以其为当日僧人诗歌总集与僧传所作序文,可见这位高僧对儒门诸科的谙熟以及本人为僧俗融合所作出的努力。

  4. Computed tomographic anatomy of the heads of blue-and-gold macaws (Ara ararauna), African grey parrots (Psittacus erithacus), and monk parakeets (Myiopsitta monachus).

    Science.gov (United States)

    Veladiano, Irene A; Banzato, Tommaso; Bellini, Luca; Montani, Alessandro; Catania, Salvatore; Zotti, Alessandro

    2016-12-01

    OBJECTIVE To create an atlas of the normal CT anatomy of the head of blue-and-gold macaws (Ara ararauna), African grey parrots (Psittacus erithacus), and monk parakeets (Myiopsitta monachus). ANIMALS 3 blue-and-gold macaws, 5 African grey parrots, and 6 monk parakeets and cadavers of 4 adult blue-and-gold macaws, 4 adult African grey parrots, and 7 monk parakeets. PROCEDURES Contrast-enhanced CT imaging of the head of the live birds was performed with a 4-multidetector-row CT scanner. Cadaveric specimens were stored at -20°C until completely frozen, and each head was then sliced at 5-mm intervals to create reference cross sections. Frozen cross sections were cleaned with water and photographed on both sides. Anatomic structures within each head were identified with the aid of the available literature, labeled first on anatomic photographs, and then matched to and labeled on corresponding CT images. The best CT reconstruction filter, window width, and window level for obtaining diagnostic images of each structure were also identified. RESULTS Most of the clinically relevant structures of the head were identified in both the cross-sectional photographs and corresponding CT images. Optimal visibility of the bony structures was achieved via CT with a standard soft tissue filter and pulmonary window. The use of contrast medium allowed a thorough evaluation of the soft tissues. CONCLUSIONS AND CLINICAL RELEVANCE The labeled CT images and photographs of anatomic structures of the heads of common pet parrot species created in this study may be useful as an atlas to aid interpretation of images obtained with any imaging modality.

  5. Jaw myogenesis in the monk parakeet: evidence of developmental reprogramming in the emergence of novel muscles in Psittaciformes (Aves).

    Science.gov (United States)

    Carril, Julieta; Ronderos, Jorge R; Tambussi, Claudia P; Chiale, María C

    2016-12-01

    Psittaciformes have apomorphies in the muscles of the jaw that include both the adductors m. ethmomandibularis (EM) and m. pseudomasseter (PM), which are responsible for the generation of strong bite forces. While the EM is present in all Psittaciformes, the PM can be absent or present, and even underdeveloped or well-developed. The aim of this study is to identify developmental reprogramming processes by comparing the myogenesis of the jaw of the monk parakeet Myiopsitta monachus with the information available about other species of Psittaciformes. Seventeen specimens including embryos at different developmental stages, and nestlings of different ages were studied through the analysis of serial histological sections. At embryonic stage 24 (S24) the muscle precursor was observed in the first pharyngeal arch. At S27 the muscle precursor was found to be divided into lateral, intermediate and medial portions. At S31 the independent development of the EM as a rostro-dorsal projection of the mm. pterygoidei could be observed. At S36 the individualization of all muscles was complete. Finally, the PM was detected two days after hatching as an aponeurotic dorsal projection of the m. adductor mandibulae externus superficialis, located lateral to the arcus jugalis. Our results suggest that in M. monachus the muscles EM and PM emerge as a result of a process of heterotipy, and variations in the degree of development of the PM are associated to a heterochronic process of post-displacement, with M. monachus having an underdeveloped PM with respect to basal Psittaciformes. Copyright © 2016 Elsevier GmbH. All rights reserved.

  6. Perfect Fluid Quantum Anisotropic Universe: Merits and Challenges

    CERN Document Server

    Majumder, Barun

    2012-01-01

    The present paper deals with quantization of perfect fluid anisotropic cosmological models. Bianchi type V and IX models are discussed following Schutz's method of expressing fluid velocities in terms of six potentials. The wave functions are found for several examples of equations of state. In one case a complete wave packet could be formed analytically. The initial singularity of a zero proper volume can be avoided in this case, but it is plagued by the usual problem of non-unitarity of anisotropic quantum cosmological models. It is seen that a particular operator ordering alleviates this problem.

  7. Non-adiabatic perturbations in multi-component perfect fluids

    Energy Technology Data Exchange (ETDEWEB)

    Koshelev, N.A., E-mail: koshna71@inbox.ru [Ulyanovsk State University, Leo Tolstoy str 42, 432970 (Russian Federation)

    2011-04-01

    The evolution of non-adiabatic perturbations in models with multiple coupled perfect fluids with non-adiabatic sound speed is considered. Instead of splitting the entropy perturbation into relative and intrinsic parts, we introduce a set of symmetric quantities, which also govern the non-adiabatic pressure perturbation in models with energy transfer. We write the gauge invariant equations for the variables that determine on a large scale the non-adiabatic pressure perturbation and the rate of changes of the comoving curvature perturbation. The analysis of evolution of the non-adiabatic pressure perturbation has been made for several particular models.

  8. Mechanical Energy Changes in Perfectly Inelastic Collisions

    Science.gov (United States)

    Mungan, Carl E.

    2013-01-01

    Suppose a block of mass "m"[subscript 1] traveling at speed "v"[subscript 1] makes a one-dimensional perfectly inelastic collision with another block of mass "m"[subscript 2]. What else does one need to know to calculate the fraction of the mechanical energy that is dissipated in the collision? (Contains 1 figure.)

  9. What is anthropological about The Perfect Human?

    DEFF Research Database (Denmark)

    Thomsen, Line Hassall

    2015-01-01

    Jørgen Leth has classified The Perfect Human as an anthropological film. But is the film anthropological at all? This article explores Leth’s connections with anthropology and finds that he is more inspired by anthropological framing than he is by anthropological research methods....

  10. Designing a perfect cornea: computational aspects

    Science.gov (United States)

    Rubinstein, Jacob; Wolansky, Gershon

    2002-12-01

    We analyze an algorithm for the design of a perfect cornea that exactly focuses a preselected object or a preselected wave front on the retina. The algorithm can be used, for example, in refractive surgery. We consider the sensitivity of the algorithm to various errors, including errors in the measurements of the aberrations, the original corneal topography and the ablation process.

  11. Perfect imaging without negative refraction for microwaves

    CERN Document Server

    Ma, Yun Gui; Sahebdivan, Sahar; Tyc, Tomas; Leonhardt, Ulf

    2010-01-01

    We demonstrate perfect imaging in Maxwell's fish eye for microwaves. Our data show that the field of a line source is imaged with subwavelength resolution over superwavelength distances, provided the field is allowed to leave through passive outlets that play the role of a detector array in imaging.

  12. Perfect Day: A Meditation about Teaching

    Science.gov (United States)

    Valadez, Gilbert

    2004-01-01

    When asked by a student in a seminar recently if he could remember a perfect day teaching elementary school, the author writes memories of one he distinctly remembers because he gained new insight into teaching on that particular day. After returning to work following the devastating loss of a younger 19 year-old brother in a car crash, he resumed…

  13. Perfectly Secure Oblivious RAM without Random Oracles

    DEFF Research Database (Denmark)

    Damgård, Ivan Bjerre; Meldgaard, Sigurd Torkel; Nielsen, Jesper Buus

    2011-01-01

    We present an algorithm for implementing a secure oblivious RAM where the access pattern is perfectly hidden in the information theoretic sense, without assuming that the CPU has access to a random oracle. In addition we prove a lower bound on the amount of randomness needed for implementing...

  14. Le Perfectionnement en Phonetique (Perfecting Phonetics)

    Science.gov (United States)

    Laroche-Bouvy, Danielle

    1975-01-01

    This article describes the programs of the Institut d'Etudes Linguistiques et Phonetiques, located in Paris. The program focuses on perfecting the students' phonetic production of French. Both curriculum and teaching methods are described, as well as a course in phonetics for future teachers of French. (Text is in French.) (CLK)

  15. A perfect absorber made of a graphene micro-ribbon metamaterial

    CERN Document Server

    Alaee, Rasoul; Rockstuhl, Carsten; Lederer, Falk

    2012-01-01

    Metamaterial-based perfect absorbers promise many applica- tions. Perfect absorption is characterized by the complete suppression of transmission and reflection and complete dissipation of the incident energy by the absorptive meta-atoms. A certain absorption spectrum is usually assigned to a bulk medium and serves as a signature of the respective material. Here we show how to use graphene flakes as building blocks for perfect absorbers. Then, an absorbing meta-atom only consists of a molecular monolayer placed at an appropriate distance from a metallic ground plate. We show that the functionality of such device is intuitively and correctly explained by a Fabry-Perot model.

  16. Coherent perfect absorption induced by the nonlinearity of a Helmholtz resonator.

    Science.gov (United States)

    Achilleos, V; Richoux, O; Theocharis, G

    2016-07-01

    In this work, coherent perfect absorption of sound waves induced by the nonlinear response of a Helmholtz Resonator side loaded to a waveguide, is reported. It is shown that this two-port system can perfectly absorb two high amplitude symmetric incident waves under a certain condition. For the one-sided incidence configuration, this condition leads to an absorption equal to 0.5. Experiments verify these results and are in agreement with an analytical nonlinear impedance model for the resonator. The nonlinear control of perfect absorption opens new possibilities in the design of high amplitude sound attenuators for aero-engine applications.

  17. Approximating perfection a mathematician's journey into the world of mechanics

    CERN Document Server

    Lebedev, Leonid P

    2004-01-01

    This is a book for those who enjoy thinking about how and why Nature can be described using mathematical tools. Approximating Perfection considers the background behind mechanics as well as the mathematical ideas that play key roles in mechanical applications. Concentrating on the models of applied mechanics, the book engages the reader in the types of nuts-and-bolts considerations that are normally avoided in formal engineering courses: how and why models remain imperfect, and the factors that motivated their development. The opening chapter reviews and reconsiders the basics of c

  18. Counterrotating perfect fluid discs as sources of electrovacuum static spacetimes

    CERN Document Server

    García-Reyes, Gonzalo

    2008-01-01

    The interpretation of some electrovacuum spacetimes in terms of counterrotating perfect fluid discs is presented. The interpretation is mades by means of an "inverse problem" approach used to obtain disc sources of known static solutions of the Einstein-Maxwell equations. In order to do such interpretation, a detailed study is presented of the counterrotating model (CRM) for generic electrovacuum static axially symmetric relativistic thin discs with nonzero radial pressure. Four simple families of models of counterrotating charged discs based on Chazy-Curzon-type, Zipoy-Voorhees-type, Bonnor-Sackfield-type, and charged and magnetized Darmois electrovacuum metrics are considered where we obtain some discs with a CRM well behaved.

  19. The covariant approach to LRS perfect fluid spacetime geometries

    CERN Document Server

    Van Elst, H; van Elst, Henk; Ellis, George F R

    1995-01-01

    The dynamics of perfect fluid spacetime geometries which exhibit {\\em Local Rotational Symmetry} (LRS) are reformulated in the language of a 1+\\,3 "threading" decomposition of the spacetime manifold, where covariant fluid and curvature variables are used. This approach presents a neat alternative to the orthonormal frame formalism. The dynamical equations reduce to a set of differential relations between purely scalar quantities. The consistency conditions are worked out in a transparent way. We discuss their various subcases in detail and focus in particular on models with higher symmetries within the class of expanding spatially inhomogeneous LRS models, via a consideration of functional dependencies between the dynamical variables.

  20. Taming electromagnetic metamaterials for isotropic perfect absorbers

    Directory of Open Access Journals (Sweden)

    Doan Tung Anh

    2015-07-01

    Full Text Available Conventional metamaterial absorbers, which consist of a dielectric spacer sandwiched between metamaterial resonators and a metallic ground plane, have been inherently anisotropic. In this paper, we present an alternative approach for isotropic perfect absorbers using symmetric metamaterial structures. We show that by systematically manipulating the electrically and magnetically induced losses, one can achieve a desired absorption without breaking the structural homogeneity. Finite integration simulations and standard retrieval method are performed to elaborate on our idea.

  1. How To Boil the Perfect Egg

    Institute of Scientific and Technical Information of China (English)

    小雨

    2007-01-01

    A British inventor says he has cracked(破解)the age-old riddle(难题)of how to boil the perfect egg,get rid of(摆脱)the water. Simon Rhymes uses powerful light bulbs instead of boiling water to cook the egg. The gadget(小发明)does the job in six minutes,and then chons off(削)the top of

  2. Mechanical Energy Changes in Perfectly Inelastic Collisions

    Science.gov (United States)

    2013-04-01

    moving slow. References 1. J. W. Zwart, “A safe and inexpensive ballistic pendulum ,” Phys. Teach. 25, 447–448 (Oct. 1987). 2. In a perfectly...that one is not satisfied with the maximum height h reached by a bal- listic pendulum after a bullet (of mass m and speed u) is fired into it, and...3) in the limit that m << M. Maximizing the height requires phase matching between the period of the pendulum and the

  3. Another Class of Perfect Nonlinear Polynomial Functions

    Directory of Open Access Journals (Sweden)

    Menglong Su

    2013-01-01

    Full Text Available Perfect nonlinear (PN functions have been an interesting subject of study for a long time and have applications in coding theory, cryptography, combinatorial designs, and so on. In this paper, the planarity of the trinomials xpk+1+ux2+vx2pk over GF(p2k are presented. This class of PN functions are all EA-equivalent to x2.

  4. MONK Project and the Reference for Text Mining Applied to the Humanities in China%MONK项目及其对我国人文领域文本挖掘的借鉴

    Institute of Scientific and Technical Information of China (English)

    许鑫; 郭金龙; 蔚海燕

    2012-01-01

    MONK is a crossdisciplinary text mining project in the humanities undertaken by several universities and research institutes from America and Canada. This paper mainly discusses the text mining process of MONK as well as relevant tools, techniques and algorithm. Two case studies based on MONK are introduced to give details about the application of text mining to the humanities. Finally the authors summarize some unique applications of text mining applied to the humanities and discuss what we can learn from the MONK projeet.%针对美国和加拿大等高校共同承担的大型跨学科人文文本挖掘项目MONK,详细介绍其文本挖掘流程及相应的工具、技术和算法,并具体探讨利用MONK提供的工具进行文学文本挖掘研究的应用实例。最后总结人文领域文本挖掘方法的几类应用,提出该项目对我国人文领域应用文本挖掘的启示。

  5. Ideal cylindrical cloak: perfect but sensitive to tiny perturbations.

    Science.gov (United States)

    Ruan, Zhichao; Yan, Min; Neff, Curtis W; Qiu, Min

    2007-09-14

    A cylindrical wave expansion method is developed to obtain the scattering field for an ideal two-dimensional cylindrical invisibility cloak. A near-ideal model of the invisibility cloak is set up to solve the boundary problem at the inner boundary of the cloak shell. We confirm that a cloak with the ideal material parameters is a perfect invisibility cloak by systematically studying the change of the scattering coefficients from the near-ideal case to the ideal one. However, because of the slow convergence of the zeroth-order scattering coefficients, a tiny perturbation on the cloak would induce a noticeable field scattering and penetration.

  6. Metamaterial-inspired perfect tunnelling in semiconductor heterostructures

    Energy Technology Data Exchange (ETDEWEB)

    Jelinek, L [Department of Electromagnetic Field, Czech Technical University in Prague, Prague (Czech Republic); Baena, J D [Department of Physics, National University of Colombia, Bogota (Colombia); Voves, J [Department of Microelectronics, Czech Technical University in Prague, Prague (Czech Republic); Marques, R, E-mail: l_jelinek@us.es [Department of Electronics and Electromagnetism, University of Seville, Seville (Spain)

    2011-08-15

    In this paper, we use a formal analogy of the electromagnetic wave equation and the Schroedinger equation in order to study the phenomenon of perfect tunnelling (tunnelling with unitary transmittance) in a one-dimensional semiconductor heterostructure. Using the Kane model of a semiconductor, we show that this phenomenon can indeed exist, resembling all the interesting features of the corresponding phenomenon in classical electromagnetism in which metamaterials (substances with negative material parameters) are involved. We believe that these results can pave the way toward interesting applications in which metamaterial ideas are transferred into the semiconductor domain.

  7. From a reading devoted monk to an idealist prompter: the Serbian Quixotes across the centuries

    Directory of Open Access Journals (Sweden)

    Jasna Stojanović

    2012-12-01

    Full Text Available In this paper we analyze the characters of several Serbian novels published from the Enlightenment to the present day, whose main characters show obvious resemblances with Cervantes’ Don Quixote: Dositej Obradović´s Život i priključenija (1783, Jovan Sterija Popović´s Roman bez romana (1838, various novels of Jakov Ignjatović (Večiti mladoženja, 1878; Vasa Rešpekt, 1875; Milan Narandžić, 1860-1862, and Sančova verzija by Ratomir Damjanović (1999. We analyze their personalities, pointing out the similarities with their model and then exploring the differences or particularities emanating from either the author’s style, the period of its creation and/or the poetics of the Serbian literature. Our goal is to investigate the manner and the level in which the Cervantine legacy has been creatively transformed and what constant characteristics of the personality of Don Quixote have resisted the passage of time.

  8. Conjugate metamaterials and the perfect lens

    CERN Document Server

    Xu, Yadong; Xu, Lin; Chen, Huanyang

    2015-01-01

    In this letter, we show how transformation optics makes it possible to design what we call conjugate metamaterials. We show that these materials can also serve as substrates for making a subwavelength-resolution lens. The so-called "perfect lens", which is a lens that could focus all components of light (including propagating and evanescent waves), can be regarded as a limiting case, in which the respective conjugate metamaterials approach the characteristics of left-handed metamaterials, which have a negative refractive index.

  9. Diamagnetic expansions for perfect quantum gases

    DEFF Research Database (Denmark)

    Briet, Philippe; Cornean, Horia; Louis, Delphine

    2006-01-01

    In this work we study the diamagnetic properties of a perfect quantum gas in the presence of a constant magnetic field of intensity B. We investigate the Gibbs semigroup associated with the one particle operator at finite volume, and study its Taylor series with respect to the field parameter omega......:=eB/c in different topologies. This allows us to prove the existence of the thermodynamic limit for the pressure and for all its derivatives with respect to omega (the so-called generalized susceptibilities)....

  10. Filtering with perfectly correlated measurement noise.

    Science.gov (United States)

    Reasenberg, R.

    1972-01-01

    Examination of (radar) Doppler data which are formed by mi1ing the returning microwave signal with a replica of the transmitted signal, counting the cycles of the beat, and sampling the counter at evenly spaced intervals t sub i. It is shown that the amount of information which can be extracted from a set of data may be larger if the associated noise is perfectly correlated than if it is white, and that the use of the white noise assumption in the filter may result in the loss of some of this information.

  11. Achieving global perfect homeostasis through transporter regulation

    Science.gov (United States)

    Springer, Michael

    2017-01-01

    Nutrient homeostasis—the maintenance of relatively constant internal nutrient concentrations in fluctuating external environments—is essential to the survival of most organisms. Transcriptional regulation of plasma membrane transporters by internal nutrient concentrations is typically assumed to be the main mechanism by which homeostasis is achieved. While this mechanism is homeostatic we show that it does not achieve global perfect homeostasis—a condition where internal nutrient concentrations are completely independent of external nutrient concentrations for all external nutrient concentrations. We show that the criterion for global perfect homeostasis is that transporter levels must be inversely proportional to net nutrient flux into the cell and that downregulation of active transporters (activity-dependent regulation) is a simple and biologically plausible mechanism that meets this criterion. Activity-dependent transporter regulation creates a trade-off between robustness and efficiency, i.e., the system's ability to withstand perturbation in external nutrients and the transporter production rate needed to maintain homeostasis. Additionally, we show that a system that utilizes both activity-dependent transporter downregulation and regulation of transporter synthesis by internal nutrient levels can create a system that mitigates the shortcomings of each of the individual mechanisms. This analysis highlights the utility of activity-dependent regulation in achieving homeostasis and calls for a re-examination of the mechanisms of regulation of other homeostatic systems. PMID:28414718

  12. Sublithographic Architecture: Shifting the Responsibility for Perfection

    Science.gov (United States)

    Dehon, A.

    In the past, processing had orders of magnitude between devices and atoms (e.g., with silicon atom lattice spacing around 0.5 nm, a minimum size feature was roughly 2000 atoms wide when we had 1 μm feature sizes). It was the process engineer's job to craft this large collection of atoms into "perfect" devices. The circuit designer and architect could then design systems knowing the process engineer would always give them a set of perfect devices. As we continue to shrink our devices, we no longer have orders of magnitude between the devices and the atoms. As a result, the circuit designers and architects are beginning to work within a similar realm of atoms. Consequently, they must assume some of the responsibilities for dealing with atomic-scale imperfections and uncertainty. This demands a significant shift in our abstraction hierarchy, the responsibilities and expectations at each level in this hierarchy, our fabrication techniques, our testing strategies, and our approaches to design for these atomic-scale computing systems.

  13. On the Works by and Thoughts of Master Monk Yan- shou%永明延寿禅师的著述及思想略论

    Institute of Scientific and Technical Information of China (English)

    黄诚

    2012-01-01

    Yan- shou was a great influential master monk with Buddhist thoughts. In his life, he insisted on "Chan Jing Jian Xiu" ( "Chan is integrated with Sukhavati" ), " Chan Jie Bing Zhong" ( " Chan is integrated with Rules" ). He wrote many theoretical works on Buddhism and Chan. These works not only express his Buddhist thought and theory, but also exert an important influence in academic field on the history of Chinese Buddhism.%永明延寿是有着重要影响的佛教思想人物。他一生"禅净兼修"、"禅戒并重",且著述颇丰。其著述集中表达了他的佛教思想及其理论主张,在中国佛教思想史上具有重要的学术思想影响。

  14. Artrópodos presentes en nidos de cotorra Myiopsitta monachus monachus (Aves: Psittacidae Arthropods in Monk Parakeet nests (Aves: Psittacidae

    Directory of Open Access Journals (Sweden)

    Rosana Aramburú

    2009-06-01

    Full Text Available El objetivo de este trabajo es comunicar una lista de la artropodofauna que se encuentra en los nidos de cotorra (Myiopsitta monachus monachus en distintas localidades de la provincia de Buenos Aires, Argentina. Se colectó un nido y 43 camas de material vegetal fresco que las cotorras depositan en las cámaras de cría. Se extrajeron los artrópodos, que se identificaron bajo lupa binocular y se caracterizaron por su nicho trófico. Se encontraron especies de la clase Arachnida (Acarina, Pseudoescorpionida y Araneae, principalmente depredadoras y hematófagas; mientras que dentro de la clase Insecta se encontraron especies hematófagas, depredadoras, detritívoras, fitófagas, nectarívoras, y xilófagas. Los órdenes más representados fueron Diptera (8 familias y Coleoptera (12 familias. El resto de las especies pertenecieron a los órdenes Collembola, Psocoptera, Hymenoptera, Phthiraptera, Hemiptera y Lepidoptera.The objective of this work is to communicate a list of artropodofauna which is in Monk Parakeet (Myiopsitta monachus monachus nests at several localities in Buenos Aires province. One nest and 43 beds of fresh green material that the Monk Parakeets deposited in the breeding chamber were collected. Arthropods were extracted, identified under binocular microscope, and characterized by their diets. Species were found whitin class Arachnida (Acarina, Pseudoescorpionida and Araneae, mainly predators and hematophagous. Within class Insecta, were found blood-sucking species, predators, detritivores, phytophagous, nectarivorous, and xilophagous, among others. The orders most represented were Diptera (8 families and Coleoptera (12 families. The rest of the species belonged to the orders Collembola, Psocoptera, Hymenoptera, Phthiraptera, Hemiptera and Lepidoptera.

  15. Do musicians with perfect pitch have more autism traits than musicians without perfect pitch?

    DEFF Research Database (Denmark)

    Dohn, Anders; Garza-Villarreal, Eduardo A; Heaton, Pamela

    2012-01-01

    Perfect pitch, also known as absolute pitch (AP), refers to the rare ability to identify or produce a musical tone correctly without the benefit of an external reference. AP is often considered to reflect musical giftedness, but it has also been associated with certain disabilities due to increased...

  16. Perfect fluid flow from granular jet impact

    CERN Document Server

    Ellowitz, Jake; Zhang, Wendy W

    2012-01-01

    Experiments on the impact of a densely-packed jet of non-cohesive grains onto a fixed target show that the impact produces an ejecta sheet comprised of particles in collimated motion. The ejecta sheet leaves the target at a well-defined angle whose value agrees quantitatively with the sheet angle produced by water jet impact. Motivated by these experiments, we examine the idealized problem of dense granular jet impact onto a frictionless target in two dimensions. Numerical results for the velocity and pressure fields within the granular jet agree quantitatively with predictions from an exact solution for 2D perfect-fluid impact. This correspondence demonstrates that the continuum limit controlling the coherent collective motion in dense granular impact is Euler flow.

  17. Negative Refraction Does Not Make Perfect Lenses

    CERN Document Server

    Yang, Weiguo

    2013-01-01

    The widely-accepted theoretical treatment of the electromagnetic boundary problem of evanescent wave transfer at an interface between a normal medium of n=1 and an ideal negative index medium of n=-1 neglects the non-zero induced surface current and charge densities at the interface and is self-inconsistent. We re-solve the electromagnetic boundary problem by taking into account the non-zero induced surface current and charge densities that have been neglected so far by others. We give the exact induced surface current and charge distributions for this special case and solve the refracted and reflected fields analytically using Green's function method. The self-consistent solution yields a transmission coefficient of 1 and reflection coefficient of 0 for all evanescent waves. Accordingly, we found that, on the contrary to the popular belief, negative index of refraction does not make perfect lenses.

  18. Perfect Multi-Channel Flat Reflectors

    CERN Document Server

    Asadchy, V S; Elsakka, A; Albooyeh, M; Tretyakov, S A

    2016-01-01

    Recent advances in engineered gradient metasurfaces have enabled unprecedented opportunities for light manipulation using optically thin sheets, such as anomalous refraction, reflection, or focusing of an incident beam. Here we introduce a concept of multi-channel functional metasurfaces, which are able to control incoming and outgoing waves in a number of propagation directions or polarization states simultaneously and independently. In particular, we reveal a possibility to create perfect multi-channel reflectors. Under the assumption of reciprocity and energy conservation, we find that there exist three fundamental classes of multi-channel mirrors. Together they form a basis of all possible reflection functionalities achievable with flat periodically modulated reflectors. To demonstrate the potential of the introduced concept, we design and experimentally test one of the basis multi-channel reflectors, confirming the desired multi-channel response. Furthermore, by extending the concept to reflectors suppor...

  19. Hiding Quantum Information in the Perfect Code

    CERN Document Server

    Shaw, Bilal A

    2010-01-01

    We present and analyze a protocol for quantum steganography where the sender (Alice) encodes her steganographic information into the error syndromes of the perfect (five-qubit) quantum error-correcting code, and sends it to the receiver (Bob) over a depolarizing channel. Alice and Bob share a classical secret key, and hide quantum information in such a way that to an eavesdropper (Eve) without access to the secret key, the quantum message looks like an innocent codeword with a typical sequence of quantum errors. We calculate the average rate of key consumption, and show how the protocol improves in performance as information is spread over multiple codeword blocks. Alice and Bob utilize different encodings to optimize the average number of steganographic bits that they can send to each other while matching the error statistics of the depolarizing channel.

  20. Interference theory of metamaterial perfect absorbers

    CERN Document Server

    Chen, Hou-Tong

    2011-01-01

    The impedance matching in metamaterial perfect absorbers has been believed to involve and rely on magnetic resonant response, with a direct evidence from the anti-parallel directions of surface currents in the metal structures. Here we present a different theoretical interpretation based on interferences, which shows that the two layers of metal structure in metamaterial absorbers are linked only by multiple reflections with negligible near-field interactions or magnetic resonances. This is further supported by the out-of-phase surface currents derived at the interfaces of resonator array and ground plane through multiple reflections and superpositions. The theory developed here explains all features observed in narrowband metamaterial absorbers and therefore provides a profound understanding of the underlying physics.

  1. The surveyors' quest for perfect alignment

    CERN Multimedia

    2003-01-01

    Photogrammetry of a CMS endcap and part of the hadronic calorimeter.The structure was covered with targets photographed by digital cameras. Perfect alignment.... Although CERN's surveyors do not claim to achieve it, they are constantly striving for it and deploy all necessary means to come as close as they can. In their highly specialised field of large-scale metrology, the solution lies in geodesy and photogrammetry, both of which are based on increasingly sophisticated instruments and systems. In civil engineering, these techniques are used for non-destructive inspection of bridges, dams and other structures, while industrial applications include dimensional verification and deformation measurement in large mechanical assemblies. The same techniques also come into play for the metrology of research tools such as large telescopes and of course, particle accelerators. Particle physics laboratories are especially demanding customers, and CERN has often asked for the impossible. As a result, the alignment metro...

  2. LensPerfect Analysis of Abell 1689

    Science.gov (United States)

    Coe, Dan A.

    2007-12-01

    I present the first massmap to perfectly reproduce the position of every gravitationally-lensed multiply-imaged galaxy detected to date in ACS images of Abell 1689. This massmap was obtained using a powerful new technique made possible by a recent advance in the field of Mathematics. It is the highest resolution assumption-free Dark Matter massmap to date, with the resolution being limited only by the number of multiple images detected. We detect 8 new multiple image systems and identify multiple knots in individual galaxies to constrain a grand total of 168 knots within 135 multiple images of 42 galaxies. No assumptions are made about mass tracing light, and yet the brightest visible structures in A1689 are reproduced in our massmap, a few with intriguing positional offsets. Our massmap probes radii smaller than that resolvable in current Dark Matter simulations of galaxy clusters. And at these radii, we observe slight deviations from the NFW and Sersic profiles which describe simulated Dark Matter halos so well. While we have demonstrated that our method is able to recover a known input massmap (to limited resolution), further tests are necessary to determine the uncertainties of our mass profile and positions of massive subclumps. I compile the latest weak lensing data from ACS, Subaru, and CFHT, and attempt to fit a single profile, either NFW or Sersic, to both the observed weak and strong lensing. I confirm the finding of most previous authors, that no single profile fits extremely well to both simultaneously. Slight deviations are revealed, with the best fits slightly over-predicting the mass profile at both large and small radius. Our easy-to-use software, called LensPerfect, will be made available soon. This research was supported by the European Commission Marie Curie International Reintegration Grant 017288-BPZ and the PNAYA grant AYA2005-09413-C02.

  3. Inter-Faith Reading of Perfect Man With Mystical Approach

    Directory of Open Access Journals (Sweden)

    Mohammadkazem Shaker

    2011-01-01

    Full Text Available   The expression Insan –e kamil (perfect man is often said to have first been used by Muhyiddin ibn 'Arabi (1165 -1240AD, though the concept of the term is much older. In his theosophical teaching, the doctrine of insan e- kamil, is held a prominent place. After him two other great Sufis, Aziz Nasafi (1300AD and 'Abd al- karim ibn Ibrahim al- Jili (1366 – 1424 AD, each wrote a work on this very issue. These works are regarded as explanations of Ibn Arabi’s teachings on human perfection. In Islamic mysticism, Perfect man is the one who within their soul possesses all God's names and attributes. Thus the perfect man’s existence, reality and inner might become a clear mirror and a complete reflection of the Perfection, Beauty and Glory of the Essence of the One, so that he becomes Godlike. However, the idea of human perfectibility going back to other religions and human schools even before Islam. In Abrahimic religions there are some joint teachings that could be considered as main statements for the doctrine of Perfect Man In Jewish scriptures the notion of human creation in God's image suggests that the human being is able to be God's like and the perfection is available to him. However, Jews do not believe a perfect man. They hold that even Moses is not a perfect man. In Christianity, Although Jesus encourages his followers to be perfect like their heavenly fathers, the doctrine of original sin to be considered as an obstacle for human perfectibility.This essay examines some significant element in human perfectibility from the view points of some scholars of Judaism, Christianity and Islam and presents some similarities and differences of their view points.

  4. Inter-Faith Reading of Perfect Man With Mystical Approach

    Directory of Open Access Journals (Sweden)

    Shaker, M.K

    2011-01-01

    Full Text Available The expression Insan –e kamil (perfect man is often said to have first been used by Muhyiddin ibn 'Arabi (1165 -1240AD, though the concept of the term is much older. In his theosophical teaching, the doctrine of insan e- kamil, is held a prominent place. After him two other great Sufis, Aziz Nasafi (1300AD and 'Abd al- karim ibn Ibrahim al- Jili (1366 – 1424 AD, each wrote a work on this very issue. These works are regarded as explanations of Ibn Arabi’s teachings on human perfection. In Islamic mysticism, Perfect man is the one who within their soul possesses all God's names and attributes. Thus the perfect man’s existence, reality and inner might become a clear mirror and a complete reflection of the Perfection, Beauty and Glory of the Essence of the One, so that he becomes Godlike. However, the idea of human perfectibility going back to other religions and human schools even before Islam. In Abrahimic religions there are some joint teachings that could be considered as main statements for the doctrine of Perfect Man In Jewish scriptures the notion of human creation in God's image suggests that the human being is able to be God's like and the perfection is available to him. However, Jews do not believe a perfect man. They hold that even Moses is not a perfect man. In Christianity, Although Jesus encourages his followers to be perfect like their heavenly fathers, the doctrine of original sin to be considered as an obstacle for human perfectibility.This essay examines some significant element in human perfectibility from the view points of some scholars of Judaism, Christianity and Islam and presents some similarities and differences of their view points.

  5. Inhomogeneous generalizations of Bianchi Type VIh universes with stiff perfect fluid and radiation

    Science.gov (United States)

    Roy, S. R.; Prasad, A.

    1995-03-01

    Families of inhomogeneous models filled with a stiff perfect fluid and radiation have been derived in which there is no flow of total momentum. The models are generalizations of those of Bianchi Type VIh and are discussed for some particular forms of the arbitrary functions appearing in them.

  6. Perfect simulation and moment properties for the Matérn type III process

    DEFF Research Database (Denmark)

    Møller, Jesper; Huber, Mark L.; Wolpert, Robert L.

    2010-01-01

    In a seminal work, Bertil Matérn introduced several types of processes for modeling repulsive point processes. In this paper an algorithm is presented for the perfect simulation of the Matérn III process within a bounded window in , fully accounting for edge effects. A simple upper bound on the m......In a seminal work, Bertil Matérn introduced several types of processes for modeling repulsive point processes. In this paper an algorithm is presented for the perfect simulation of the Matérn III process within a bounded window in , fully accounting for edge effects. A simple upper bound...

  7. The Perfect Glass Paradigm: Disordered Hyperuniform Glasses Down to Absolute Zero

    Science.gov (United States)

    Zhang, G.; Stillinger, F. H.; Torquato, S.

    2016-11-01

    Rapid cooling of liquids below a certain temperature range can result in a transition to glassy states. The traditional understanding of glasses includes their thermodynamic metastability with respect to crystals. However, here we present specific examples of interactions that eliminate the possibilities of crystalline and quasicrystalline phases, while creating mechanically stable amorphous glasses down to absolute zero temperature. We show that this can be accomplished by introducing a new ideal state of matter called a “perfect glass”. A perfect glass represents a soft-interaction analog of the maximally random jammed (MRJ) packings of hard particles. These latter states can be regarded as the epitome of a glass since they are out of equilibrium, maximally disordered, hyperuniform, mechanically rigid with infinite bulk and shear moduli, and can never crystallize due to configuration-space trapping. Our model perfect glass utilizes two-, three-, and four-body soft interactions while simultaneously retaining the salient attributes of the MRJ state. These models constitute a theoretical proof of concept for perfect glasses and broaden our fundamental understanding of glass physics. A novel feature of equilibrium systems of identical particles interacting with the perfect-glass potential at positive temperature is that they have a non-relativistic speed of sound that is infinite.

  8. Directional perfect absorption using deep subwavelength low permittivity films

    CERN Document Server

    Luk, Ting S; Kim, Iltai; Feng, Simin; Jun, Young Chul; Liu, Sheng; Wright, Jeremy B; Brener, Igal; Catrysse, Peter B; Fan, Shanhui; Sinclair, Michael B

    2014-01-01

    We experimentally demonstrate single beam directional perfect absorption (to within experimental accuracy) of p-polarized light in the near-infrared using unpatterned, deep subwavelength films of indium tin oxide (ITO) on Ag. The experimental perfect absorption occurs slightly above the epsilon-near-zero (ENZ) frequency of ITO where the permittivity is less than one. Remarkably, we obtain perfect absorption for films whose thickness is as low as ~1/50th of the operating free-space wavelength and whose single pass attenuation is only ~ 5%. We further derive simple analytical conditions for perfect absorption in the subwavelength-film regime that reveal the constraints that the ITO permittivity must satisfy if perfect absorption is to be achieved. Then, to get a physical insight on the perfect absorption properties, we analyze the eigenmodes of the layered structure by computing both the real-frequency/complex-wavenumber and the complex-frequency/real-wavenumber modal dispersion diagrams. These analyses allow u...

  9. Comment on 'Perfect drain for the Maxwell fish eye lens'

    CERN Document Server

    Sun, Fei

    2012-01-01

    The non-magnetic loss material has been proposed (2011 New J. Phys. 13 023038) to mimic a passive perfect drain in the Maxwell's fish eye lens (MFL). In this comment, we argue that this passive medium can only be treated as a perfect absorber which can totally absorb all incident radiation without scattering by it, but it cannot mimic a delta function at the image point. As a result, this passive medium cannot help to achieve a perfect focusing in MFL.

  10. Product Perfect Z2Z4-linear codes in Steganography

    CERN Document Server

    Rifa, J

    2010-01-01

    Product perfect codes have been proven to enhance the performance of the F5 steganographic method, whereas perfect Z2Z4-linear codes have been recently introduced as an efficient way to embed data, conforming to the +/-1-steganography. In this paper, we present two steganographic methods. On the one hand, a generalization of product perfect codes is made. On the other hand, this generalization is applied to perfect Z2Z4-linear codes. Finally, the performance of the proposed methods is evaluated and compared with those of the aforementioned schemes.

  11. Whole genome association mapping by incompatibilities and local perfect phylogenies

    DEFF Research Database (Denmark)

    Mailund, Thomas; Besenbacher, Søren; Schierup, Mikkel Heide

    2006-01-01

    Background: With current technology, vast amounts of data can be cheaply and efficiently produced in association studies, and to prevent data analysis to become the bottleneck of studies, fast and efficient analysis methods that scale to such data set sizes must be developed. Results: We present...... a fast method for accurate localisation of disease causing variants in high density case-control association mapping experiments with large numbers of cases and controls. The method searches for significant clustering of case chromosomes in the "perfect" phylogenetic tree defined by the largest region....... Haplotype data and phased genotype data can be analysed. The power and efficiency of the method is investigated on 1) simulated genotype data under different models of disease determination 2) artificial data sets created from the HapMap ressource, and 3) data sets used for testing of other methods in order...

  12. Efficient and stable perfectly matched layer for CEM

    KAUST Repository

    Duru, Kenneth

    2014-02-01

    An efficient unsplit perfectly matched layer for numerical simulation of electromagnetic waves in unbounded domains is derived via a complex change of variables. In order to surround a Cartesian grid with the PML, the time-dependent PML requires only one (scalar) auxiliary variable in two space dimensions and six (scalar) auxiliary variables in three space dimensions. It is therefore cheap and straightforward to implement. We use Fourier and energy methods to prove the stability of the PML. We extend the stability result to a semi-discrete PML approximated by central finite differences of arbitrary order of accuracy and to a fully discrete problem for the \\'Leap-Frog\\' schemes. This makes precise the usefulness of the derived PML model for longtime simulations. Numerical experiments are presented, illustrating the accuracy and stability of the PML. © 2013 IMACS.

  13. 中华大藏经版《续高僧传》在文字学研究中的价值%The Value of Chinese Tripitaka Edition Continued Biographies of Eminent Monks in the Study of Philology

    Institute of Scientific and Technical Information of China (English)

    李明龙

    2012-01-01

    Continued Biographies of Eminent Monks has big values in study of the evolution of the shape of Chinese characters and its culture and textual history and other aspects.%《续高僧传》在汉字的形体演变,汉字文化及文字学史等方面具有较大的研究价值。

  14. Challenging the standard perfect fluid paradigm

    Science.gov (United States)

    O'Brien, James

    2015-04-01

    We show that the standard perfect fluid paradigm is not necessarily a valid description of a curved space steady state gravitational source. Simply by virtue of not being flat, curved space geometries have to possess intrinsic length scales, and such length scales can affect the fluid structure.We show that for the specific case of a static, spherically symmetric geometry, the steady state energy-momentum tensor that ensues will in general be of the form Tμν =(ρ + p) UμUν + pgμν + qπμν where πμν is a symmetric, traceless rank two tensor which obeys Uμπμν = 0 . Such a qπμν type term is absent for an incoherently averaged steady state fluid in a spacetime where there are no intrinsic length scales, and in principle would thus be missed in a covariantizing of a flat spacetime Tμν. While it is reassuring that we find that in practice the effect of such qπμν type terms is small for weak gravity stars, for strong gravity systems their potential influence would need to be explored.

  15. Perfect terahertz absorber using fishnet based metafilm

    Energy Technology Data Exchange (ETDEWEB)

    Azad, Abul Kalam [Los Alamos National Laboratory; Shchegolkov, Dmitry Yu [Los Alamos National Laboratory; Chen, Houtong [Los Alamos National Laboratory; Taylor, Antoinette [Los Alamos National Laboratory; Smirnova, E I [Los Alamos National Laboratory; O' Hara, John F [Los Alamos National Laboratory

    2009-01-01

    We present a perfect terahertz (THz) absorber working for a broad-angle of incidence. The two fold symmetry of rectangular fishnet structure allows either complete absorption or mirror like reflection depending on the polarization of incident the THz beam. Metamaterials enable the ability to control the electromagnetic wave in a unique fashion by designing the permittivity or permeability of composite materials with desired values. Although the initial idea of metamaterials was to obtain a negative index medium, however, the evolution of metamaterials (MMs) offers a variety of practically applicable devices for controlling electromagnetic wave such as tunable filters, modulators, phase shifters, compact antenna, absorbers, etc. Terahertz regime, a crucial domain of the electromagnetic wave, is suffering from the scarcity of the efficient devices and might take the advantage of metamaterials. Here, we demonstrate design, fabrication, and characterization of a terahertz absorber based on a simple fishnet metallic film separated from a ground mirror plane by a dielectric spacer. Such absorbers are in particular important for bolometric terahertz detectors, high sensitivity imaging, and terahertz anechoic chambers. Recently, split-ring-resonators (SRR) have been employed for metamaterial-based absorbers at microwave and THz frequencies. The experimental demonstration reveals that such absorbers have absorptivity close to unity at resonance frequencies. However, the downside of these designs is that they all employ resonators of rather complicated shape with many fine parts and so they are not easy to fabricate and are sensitive to distortions.

  16. Coherent perfect absorption in photonic structures

    CERN Document Server

    Baldacci, Lorenzo; Tredicucci, Alessandro

    2016-01-01

    The ability to drive a system with an external input is a fundamental aspect of light-matter interaction. The coherent perfect absorption (CPA) phenomenon extends to the general multibeam interference phenomenology the well known critical coupling concepts. This interferometric control of absorption can be employed to reach full delivery of optical energy to nanoscale systems such as plasmonic nanoparticles, and multi-port interference can be used to enhance the absorption of a nanoscale device when it is embedded in a strongly scattering system, with potential applications to nanoscale sensing. Here we review the two-port CPA in reference to photonic structures which can resonantly couple to the external fields. A revised two-port theory of CPA is illustrated, which relies on the Scattering Matrix formalism and is valid for all linear two-port systems with reciprocity. Through a semiclassical approach, treating two-port critical coupling conditions in a non-perturbative regime, it is demonstrated that the st...

  17. Perfect crystal interferometer and its applications

    Energy Technology Data Exchange (ETDEWEB)

    Hasegawa, Yuji [Atominstitut der Oesterreichischen Universitaeten, Vienna (Austria)

    1996-08-01

    The interferometry with angstrom scale wavelength has developed steadily, and various types of interferometers have been investigated. Among them, LLL interferometers are widely used. The first neutron interferometry was achieved in 1962 by Maier-Leibnitz et al. A new type of neutron interferometers was constructed with a perfect crystal, and experimentally performed in 1974 by Rauch et al. The precise measurements with LLL neutron interferometers were performed on scattering length, gravitational effect, coherence, Fizeau effects, spin superposition, complementarity, and post-selection effects. Since the early stage of quantum physics, the double-slit experiment has served as the example of the epistemologically strange features of quantum phenomena, and its course of study is described. The time-delayed interferometry with nuclear resonant scattering of synchrotron radiation and phase transfer in time-delayed interferometry with nuclear resonant scattering were experimented, and are briefly reported. A geometric phase factor was derived for a split beam experiment as an example of cyclic evolution. The geometric phase was observed with a two-loop neutron interferometer. All the experimental results showed complete agreement with the theoretical treatment. (K.I.)

  18. Perfectly secure encryption of individual sequences

    CERN Document Server

    Merhav, Neri

    2011-01-01

    In analogy to the well-known notion of finite--state compressibility of individual sequences, due to Lempel and Ziv, we define a similar notion of "finite-state encryptability" of an individual plaintext sequence, as the minimum asymptotic key rate that must be consumed by finite-state encrypters so as to guarantee perfect secrecy in a well-defined sense. Our main basic result is that the finite-state encryptability is equal to the finite-state compressibility for every individual sequence. This is in parallelism to Shannon's classical probabilistic counterpart result, asserting that the minimum required key rate is equal to the entropy rate of the source. However, the redundancy, defined as the gap between the upper bound (direct part) and the lower bound (converse part) in the encryption problem, turns out to decay at a different rate (in fact, much slower) than the analogous redundancy associated with the compression problem. We also extend our main theorem in several directions, allowing: (i) availability...

  19. Practice makes two hemispheres almost perfect.

    Science.gov (United States)

    Cherbuin, Nicolas; Brinkman, Cobie

    2005-08-01

    Some tasks produce a performance advantage for conditions that require the processing of stimuli in two visual fields compared to conditions where single hemifield processing is sufficient. This advantage, however, disappears with practice. Although no definitive evidence yet exists, there are several possible mechanisms that might lead to improved performance of within- compared to across-hemisphere processing with practice. These include a shift from a more demanding, algorithmic strategy to a less demanding memory-retrieval strategy (e.g., [G. Logan, Toward an instance theory of automatisation. Psych. Rev. 95 (1988) 492-527]), as discussed by Weissman and Compton [D.H. Weissman, R.J. Compton, Practice makes a hemisphere perfect: the advantage of interhemispheric recruitment is eliminated with practice. Laterality, 8 (4) (2003) 361-375], and/or a more generalised practice effect [K. Kirsner, C. Speelman, Skill acquisition and repetition priming: one principle, many processes? J. Exp. Psychol., Learn. Mem. Cogn., 22 (1996) 563-575]. Contrary to Weissman and Compton findings, our results suggest that although single-hemisphere performance improves with practice, bi-hemispheric performance also improves substantially. Furthermore, these effects do not appear to be due to a shift in strategy but rather due to a general practice effect.

  20. Conversion of α-linolenic acid to long-chain omega-3 fatty acid derivatives and alterations of HDL density subfractions and plasma lipids with dietary polyunsaturated fatty acids in Monk parrots (Myiopsitta monachus).

    Science.gov (United States)

    Petzinger, C; Larner, C; Heatley, J J; Bailey, C A; MacFarlane, R D; Bauer, J E

    2014-04-01

    The effect of α-linolenic acid from a flaxseed (FLX)-enriched diet on plasma lipid and fatty acid metabolism and possible atherosclerosis risk factors was studied in Monk parrots (Myiopsitta monachus). Twenty-four Monk parrots were randomly assigned to diets containing either 10% ground SUNs or 10% ground FLXs. Feed intake was calculated daily. Blood samples, body condition scores and body weights were obtained at -5 weeks, day 0, 7, 14, 28, 42 and 70. Plasma samples were analysed for total cholesterol, free cholesterol, triacylglycerols and lipoproteins. Phospholipid subfraction fatty acid profiles were determined. By day 70, the FLX group had significantly higher plasma phospholipid fatty acids including 18:3n-3 (α-linolenic acid), 20:5n-3 (eicosapentaenoic acid) and 22:6n-3 (docosahexaenoic acid). The sunflower group had significantly higher plasma phospholipid levels of 20:4n-6 (arachidonic acid). By day 70, the high-density lipoprotein (HDL) peak shifted resulting in significantly different HDL peak densities between the two experimental groups (1.097 g/ml FLX group and 1.095 g/ml SUN group, p = 0.028). The plasma fatty acid results indicate that Monk parrots can readily convert α-linolenic acid to the long-chain omega-3 derivatives including docosahexaenoic acid and reduce 20:4n-6 accumulation in plasma phospholipids. The reason for a shift in the HDL peak density is unknown at this time.

  1. Three-fold Narration in Novels about Strange Monks in Records of Taiping Era (太平广记)%《太平广记》异僧小说的“三重”叙事

    Institute of Scientific and Technical Information of China (English)

    曾礼军

    2014-01-01

    With religious , biographical and aesthetic features , novels about strange monks in Records of Taip-ing Era (太平广记) represent the narrative achievement of monk biography in the Jin and Tang dynasties .In the magical narration , the philosophic thought and nature of Buddhism are accommodated .In the biographical narra-tion, the mystical concept and religious truth are attached .In the aesthetic narration , the monk images and reli-gious magic are depicted .%《太平广记》异僧小说整体上代表了晋唐时期僧传文学的叙事成就,有着宗教性、史传性和审美性三位一体的叙事特征。其神异叙事善于融通佛教哲思和启悟佛性体认;史传叙事注重烘托神异观念和突出宗教真实;审美叙事重视刻画僧人形象和描绘宗教神奇。

  2. On activity space of monks in the Song Dynasty from the angel of Yi Jian Zhi%从《夷坚志》看宋代僧人活动空间

    Institute of Scientific and Technical Information of China (English)

    王翠

    2012-01-01

    Yi Jian Zhi written by Hong Mai in the Southern Song Dynasty described the social behaviors from the late Northern Song Dynasty to the early Southern Song Dynasty, among which there were a lot about monks. In the book, the activity space of monks was wide, their social networking was active, and their social activities were various. People of that age held different opinions on it. This paper studies the relevant records about this book in order to help people have a better understanding of the society of the Northern and Southern Song Dynasties, especially the whole image of the monk group of that period.%南宋洪迈所作《夷坚志》记述了北宋末年至南宋初年的社会百态,其中关于僧人的记述尤为丰富,书中描述的僧人活动空间非常广泛,社交比较活跃,从事活动丰富多样,对此时人亦有不同议论。通过对该书相关记述的梳理,以更好地了解两宋时期的社会状态尤其是该时期僧人群体的形象。

  3. Perfection of vocational and applied training of operative workers of law enforcement authorities of Ukraine.

    Directory of Open Access Journals (Sweden)

    Sergienko J.P.

    2011-02-01

    Full Text Available A research aim is perfection of the professionally-applied training of operative workers of law enforcement authorities of Ukraine on the basis of recognition of specific of professional activity. 250 students and operative workers of Kyiv and Kyiv region took part in research. The questions of perfection of professional capacity facilities of general, special physical and psychophysiological preparedness were examined in this research. A structure and model of preparation are experimentally well-proven and indicated, the role of intercommunications of physical capacity and psychophysiological is exposed.

  4. Conformal and traversable wormholes with monopole and perfect fluid in f(R)-gravity

    Science.gov (United States)

    Taşer, Doǧukan; Doǧru, Melis Ulu

    2016-10-01

    We investigate spherically symmetric spacetime filled with global monopole and perfect fluid in f(R)-gravity. We consider field equations of f(R)-gravity in order to understand the global monopole and the perfect fluid curve to the spacetime. It has taken advantages of conformal symmetry properties of the spacetime to solve these equations. The obtained solutions are improved in case of phantom energy. It is shown that obtained f(R) function is consistent with well-known models of the modified gravity. Also, it is examined whether the obtained solutions support a traversable wormhole geometry. Obtained results of the solutions have been concluded.

  5. Perfect forward secure identity-based authenticated key agreement protocol in the escrow mode

    Institute of Scientific and Technical Information of China (English)

    WANG ShengBao; CAO ZhenFu; CHENG ZhaoHui; CHOO Kim-KwangRaymond

    2009-01-01

    The majority of existing escrowable identity-based key agreement protocols only provide partial forward secrecy. Such protocols are, arguably, not suitable for many real-word applications, as the latter tends to require a stronger sense of forward secrecy-perfect forward secrecy. In this paper, we propose an efficient perfect forward-secure identity-based key agreement protocol in the escrow mode. We prove the security of our protocol in the random oracle model, assuming the intractability of the Gap Bilinear Diffie-Hellman (GBDH) problem.

  6. 人间佛教与学僧文学创作的入世转向%Humanistic Buddhism and the Attention to the Mundane of Learning Monk

    Institute of Scientific and Technical Information of China (English)

    贾国宝

    2014-01-01

    Showing the attention to the mundane,the literary creation of Learning Monk has been inseparable from the profound impact of"Humanistic Buddhism".As an important part of Buddhist thought in modern China,Humanistic Buddhism advocated by Taixu has been marked the establish-ment of modern Buddhism,and further has promoted Buddhist socialization and secularization.Before and after May Fourth Movement,the special group named learning monk have sprung up in the Bud-dhist community,which are the supporters of Taixu Thought.They have consciously pursued the at-tention to the real life among the literary works.Facing the country invaded,they have expressed their patriotic feelings.Above all they have bravely faced Buddhist internal conflict and described the tragedy of young monk,so these novelettes have contained the strong sentimental mood that has been the true performance of these writers'own predicament.The disharmony including the diaphragm and the collision between Religious and Secular has been also displayed.They have used realistic technique in order to pay the attention to the real life,which has represented their pioneer awareness and mun-dane feelings.%学僧的文学创作及其所呈现的入世转向,离不开“人间佛教”的深刻影响。太虚大师倡导的“人间佛教”是中国近代以来佛教思潮的重要组成部分,标志着现代佛教革新方向的确立,进一步推动了佛教的“社会化”与“世俗化”。五四前后,僧界涌现出特殊的学僧群体,他们基本上是太虚思想的支持者和拥护者。深受“人间佛教”思想影响的他们,在文学创作上自觉追求对现实生活的深切关注,面对国家的被侵略,不忘爱国情怀的抒发。更为突出的是,他们敢于直面佛门内部的新旧冲突,尝试运用小说的形式描述年轻主人公的悲惨遭遇,感伤的情绪尤其浓郁,它是学僧作家自身困境的真实表现。僧俗之间的隔膜、冲

  7. Coherent Perfect Absorption induced by the nonlinearity of a Helmholtz resonator

    CERN Document Server

    Achilleos, V; Theocharis, G

    2016-01-01

    In this work, we analytically report Coherent Perfect Absorption induced by the acoustic nonlinear response of a Helmholtz Resonator side loaded to a waveguide. In particular, we show that this two-port acoustic system can perfectly absorb two high amplitude symmetric incident waves when the additive nonlinear losses in the HR, induced by the jet flow separation, together with the weak linear viscothermal losses of the HR balance the radiation losses to the waveguide. For the case of the one-sided incidence configuration, this condition leads to an absorption equal to 0.5. This result, which is verified experimentally, is in a good agreement with an analytical nonlinear model of the impedance of the HR. The nonlinear control of perfect absorption using resonators will open new possibilities in the design of high amplitude sound attenuators for aero-engine applications.

  8. An Unsplit Convolutional-Perfectly-Matched-Layer Based Boundary Formulation for the Stratified Linearized Ideal MHD equations

    CERN Document Server

    Hanasoge, S M; Gizon, L

    2010-01-01

    Perfectly matched layers are a very efficient and accurate way to absorb waves in media. We present a stable convolutional unsplit perfectly matched formulation designed for the linearized stratified Euler equations. However, the technique as applied to the Magneto-hydrodynamic (MHD) equations requires the use of a sponge, which, despite placing the perfectly matched status in question, is still highly efficient at absorbing outgoing waves. We study solutions of the equations in the backdrop of models of linearized wave propagation in the Sun. We test the numerical stability of the schemes by integrating the equations over a large number of wave periods.

  9. A cross-linguistic discourse analysis of the perfect

    NARCIS (Netherlands)

    Swart, Henriëtte de

    2007-01-01

    Since Reichenbach (1947), the Present Perfect has been discussed in relation to the Simple Past. The Reichenbachian characterization E-R,S has led to the view that the English Present Perfect, with its restrictions on modification by time adverbials and its resistance to narrative structure is the P

  10. Hypersurface-homogeneous Universe filled with perfect fluid in $f (R, T)$ theory of gravity

    Indian Academy of Sciences (India)

    A Y SHAIKH; S D KATORE

    2016-12-01

    The exact solutions of the field equations with respect to hypersurface-homogeneous Universe filled with perfect fluid in the framework of $f (R, T)$ theory of gravity (Harko et al, \\emph{Phys. Rev.} D 84, 024020 (2011)) is derived. The physical behaviour of the cosmological model is studied.

  11. Perfect simulation and moment properties for the Matérn type III process

    DEFF Research Database (Denmark)

    Møller, Jesper; Huber, Mark L.; Wolpert, Robert L.

    In a seminal work, Bertil Matérn introduced several types of processes for modeling repulsive point processes. In this paper an algorithm is presented for the perfect simulation of the Mat´ern III process within a bounded window in Rd fully accounting for edge effects. A simple upper bound...

  12. Effects of quadratic and cubic nonlinearities on a perfectly tuned parametric amplifier

    DEFF Research Database (Denmark)

    Neumeyer, Stefan; Sorokin, Vladislav; Thomsen, Jon Juel

    2016-01-01

    We consider the performance of a parametric amplifier with perfect tuning (two-to-one ratio between the parametric and direct excitation frequencies) and quadratic and cubic nonlinearities. A forced Duffing–Mathieu equation with appended quadratic nonlinearity is considered as the model system, a...

  13. Persistent Perfect Entanglement in Atomic Systems

    Science.gov (United States)

    Ali Can, Muhammet

    2004-03-01

    It has been shown recently [1] that a pure entangled state of two-level atoms can be obtained in an optical resonator through the exchange by cavity photons. Unfortunately, the lifetime of such an entangled state, caused by the radiative decay time for the dipole transitions is very short. The situation can be improved through the use of three-level atoms with lambda-type transition [2]. In this case, the cavity field pumps transition between the lowest (ground) and highest (excited) states. Then, the decay of the excited state can populate the intermediate state. This is just the Raman-type process with emission of Stokes photon in atomic system. Because of the selection rules by the parity conservation, the dipole decay from the intermediate state to the ground state is forbidden. If the Stokes photons created by the transitions from the excited state to the ground state are discarded (through the use of cavity leakage of absorption), the final state of atomic system is stabile or at least durable. In the case of 2n three-level atoms, this can lead to the N-qubit perfect entangled state, where N=2j+1 and j is an odd ``spin'' corresponding to the SU(2) algebra in the Hilbert space H=(C2)^ otimes N In fact, these are the SU(2) phase states of odd ``spin'' have been discussed in [3] in the context of two-level atoms. The possibility to create and observe these states with present experimental technique is discussed. [1] A. Beige, S. Bose, D. Braun, S.F. Huelga, P.L. Knight, M.B. Plenio, and V. Verdal. J. Mod. Optics 47, 2583 (2000). [2] M.A. Can, A.A. Klyachko, and A.S. Shumovsky. Appl. Phys. Lett. 81, 5072 (2002). [3] M.A. Can, A.A. Klyachko, and A.S. Shumovsky. Phys. Rev. A 66, 022111 (2002).

  14. Construction of random perfect phylogeny matrix

    Directory of Open Access Journals (Sweden)

    Mehdi Sadeghi

    2010-11-01

    Full Text Available Mehdi Sadeghi1,2, Hamid Pezeshk4, Changiz Eslahchi3,5, Sara Ahmadian6, Sepideh Mah Abadi61National Institute of Genetic Engineering and Biotechnology, Tehran, Iran; 2School of Computer Science, 3School of Mathematics, Institute for Research in Fundamental Sciences (IPM, Tehran, Iran; 4School of Mathematics, Statistics and Computer Sciences, Center of Excellence in Biomathematics, College of Science, University of Tehran, Tehran, Iran; 5Department of Mathematics, Shahid Beheshti University, G.C., Tehran, Iran; 6Department of Computer Engineering, Sharif University of Technology, Tehran, IranPurpose: Interest in developing methods appropriate for mapping increasing amounts of genome-wide molecular data are increasing rapidly. There is also an increasing need for methods that are able to efficiently simulate such data.Patients and methods: In this article, we provide a graph-theory approach to find the necessary and sufficient conditions for the existence of a phylogeny matrix with k nonidentical haplotypes, n single nucleotide polymorphisms (SNPs, and a population size of m for which the minimum allele frequency of each SNP is between two specific numbers a and b.Results: We introduce an O(max(n2, nm algorithm for the random construction of such a phylogeny matrix. The running time of any algorithm for solving this problem would be Ω (nm.Conclusion: We have developed software, RAPPER, based on this algorithm, which is available at http://bioinf.cs.ipm.ir/softwares/RAPPER.Keywords: perfect phylogeny, minimum allele frequency (MAF, tree, recursive algorithm 

  15. A multiband perfect absorber based on hyperbolic metamaterials.

    Science.gov (United States)

    Sreekanth, Kandammathe Valiyaveedu; ElKabbash, Mohamed; Alapan, Yunus; Rashed, Alireza R; Gurkan, Umut A; Strangi, Giuseppe

    2016-05-18

    In recent years, considerable research efforts have been focused on near-perfect and perfect light absorption using metamaterials spanning frequency ranges from microwaves to visible frequencies. This relatively young field is currently facing many challenges that hampers its possible practical applications. In this paper, we present grating coupled-hyperbolic metamaterials (GC-HMM) as multiband perfect absorber that can offer extremely high flexibility in engineering the properties of electromagnetic absorption. The fabricated GC-HMMs exhibit several highly desirable features for technological applications such as polarization independence, wide angle range, broad- and narrow- band modes, multiband perfect and near perfect absorption in the visible to near-IR and mid-IR spectral range. In addition, we report a direct application of the presented system as an absorption based plasmonic sensor with a record figure of merit for this class of sensors.

  16. 余嘉锡《四库提要辨证·神僧传》考证辨析%Yu Jiaxiˊs Textual Criticism and Discrimination on God Monk Biography of Four Abstract Dialectics

    Institute of Scientific and Technical Information of China (English)

    元文广; 靳利翠

    2016-01-01

    余嘉锡所著《四库提要辨证》是对《四库全书总目》研究的重要成果.此书对《四库总目》中的 490余篇提要进行了辨证,提出不少宝贵意见,但也存在一些可以进一步讨论的问题.仅就《四库提要辨证·神僧传》条的考证思路、论据等进行讨论,认为余嘉锡先生从目录学角度讨论《神僧传》的撰者问题,其论述过程不够严谨,所提供论据存在问题,不能直接指向结论,因此,所得结论很难令人信服.从《神僧传》版本源流角度入手,用直接论据使《神僧传》撰者问题更加明确、所得结论《神僧传》为明成祖所撰集更具说服力.%Four Abstract Dialecticswritten by Yu Jiaxi is one important result of the research on 〞Four Abstract Dialectics〞. In this book,Yu made dialectical research on490 articles in General Catalogue of Si Ku QuanShu,presenting some valuable suggestions. However,there are some problems which need further discus-sion . The dialectical thought train and grounds of argument for God Monk Biography of Four Abstract Dialectics are one example that needs further discussion. Since he studied the author from the angle of its catalogue,Yuˊs argument process of Biography of God Monk was not precise,and grounds of argument he offered could not reach the conclusion,so his conclusion was unconvincing. If the study starts with the version source of Biogra-phy of God Monk,makes the author of God Monk Biography more clear with direct grounds,and thus reach a more persuasive conclusion that Biography of God Monk was written by Emperor Cheng Zu in Ming Dynasty.

  17. Bringing the 'perfect lens' into focus by near-perfect compensation of losses without gain media

    CERN Document Server

    Adams, Wyatt; Zhang, Xu; Güney, Durdu Ö

    2016-01-01

    In this paper, the optical properties and imaging performance of a non-ideal Pendry's negative index flat lens with a practical value for loss are studied. Analytical calculations of the optical properties of the lens are performed, and those results are used to further study the lens and corresponding imaging system numerically. The plasmon injection scheme for loss compensation in negative index metamaterials is applied to the results from the imaging system, resulting in a perfect reconstruction of a previously unresolved image that demonstrates sub-diffraction-limit resolution.

  18. The use of noncrystallographic symmetry averaging to solve structures from data affected by perfect hemihedral twinning

    Energy Technology Data Exchange (ETDEWEB)

    Sabin, Charles; Plevka, Pavel, E-mail: pavel.plevka@ceitec.muni.cz [Central European Institute of Technology – Masaryk University, Kamenice 653/25, 625 00 Brno (Czech Republic)

    2016-02-16

    Molecular replacement and noncrystallographic symmetry averaging were used to detwin a data set affected by perfect hemihedral twinning. The noncrystallographic symmetry averaging of the electron-density map corrected errors in the detwinning introduced by the differences between the molecular-replacement model and the crystallized structure. Hemihedral twinning is a crystal-growth anomaly in which a specimen is composed of two crystal domains that coincide with each other in three dimensions. However, the orientations of the crystal lattices in the two domains differ in a specific way. In diffraction data collected from hemihedrally twinned crystals, each observed intensity contains contributions from both of the domains. With perfect hemihedral twinning, the two domains have the same volumes and the observed intensities do not contain sufficient information to detwin the data. Here, the use of molecular replacement and of noncrystallographic symmetry (NCS) averaging to detwin a 2.1 Å resolution data set for Aichi virus 1 affected by perfect hemihedral twinning is described. The NCS averaging enabled the correction of errors in the detwinning introduced by the differences between the molecular-replacement model and the crystallized structure. The procedure permitted the structure to be determined from a molecular-replacement model that had 16% sequence identity and a 1.6 Å r.m.s.d. for C{sup α} atoms in comparison to the crystallized structure. The same approach could be used to solve other data sets affected by perfect hemihedral twinning from crystals with NCS.

  19. Nutritional status and phytate:zinc and phytate x calcium:zinc dietary molar ratios of lacto-ovo vegetarian Trappist monks: 10 years later.

    Science.gov (United States)

    Harland, B F; Smith, S A; Howard, M P; Ellis, R; Smith, J C

    1988-12-01

    A nutrition assessment of 16 members of a community of lacto-ovo vegetarian Trappist monks was conducted in 1977. Plasma zinc was found to be low-normal, which was attributed primarily to high intakes of phytate-containing foods. Individual and group counseling were instituted over a 10-year period in an attempt to emphasize the importance of wise food selection within the constraints of lacto-ovo vegetarianism. In 1987, a more comprehensive nutrition assessment of 21 members of the same community was performed. Food composites were analyzed, and 3-day instead of 24-hour dietary records were kept. Intakes of phytate-containing foods had decreased from 4,569 to 972 mg/day; intake of dietary zinc had increased from 7.4 to 9.7 mg/day; and the phytate:zinc molar ratio had decreased from 67 to 14 for the years 1977 and 1987, respectively. An analyzed phytate:zinc molar ratio of 9.8 and an analyzed phytate x calcium:zinc molar ratio of 0.3 were representative of the 1987 community. Both were within normal ranges. Plasma zinc had risen to upper-normal levels. The 1987 nutrition assessment showed that it is possible to be adequately nourished with a lacto-ovo vegetarian diet provided one has proper knowledge of the phytate-containing foods and the methods for compensating with foods of greater mineral density (primarily zinc).

  20. A general framework for perfect simulation of long memory processes

    CERN Document Server

    De Santis, Emilio

    2010-01-01

    In this paper a general approach for the perfect simulation of a stationary process with at most countable state space is outlined. The process is specified through a kernel, prescribing the probability of each state conditional to the whole past history. We follow the seminal paper of Comets, Fernandez and Ferrari, where sufficient conditions for the construction of a certain perfect simulation algorithm have been given. We generalize this approach by defining backward coalescence times for these kind of processes; this allows us to construct perfect simulation algorithms under weaker conditions.

  1. Metasurfaces for perfect and full control of refraction and reflection

    CERN Document Server

    Asadchy, V; Tcvetkova, S; Ra'di, Y; Tretyakov, S A

    2016-01-01

    In this talk we present and discuss a new general approach to the synthesis of metasurfaces for full control of transmitted and reflected fields. The method is based on the use of an equivalent impedance matrix which connects the tangential field components at the two sides on the metasurface. Finding the impedance matrix components, we are able to synthesize metasurfaces which perfectly realize the desired response. We will explain possible alternative physical realizations and reveal the crucial role of bianisotropic coupling to achieve full control of transmission through perfectly matched metasurfaces. This abstract summarizes our results on metasurfaces for perfect refraction into an arbitrary direction.

  2. Nikishin systems are perfect. Case of unbounded and touching supports

    CERN Document Server

    Prieto, Fidalgo; Lagomasino, G López

    2010-01-01

    K. Mahler introduced the concept of perfect systems in the theory of simultaneous Hermite-Pad\\'{e} approximation of analytic functions. Recently, we proved that Nikishin systems, generated by measures with bounded support and non-intersecting consecutive supports contained on the real line, are perfect. Here, we prove that they are also perfect when the supports of the generating measures are unbounded or touch at one point. As an application, we give a version of Stieltjes' theorem in the context of simultaneous Hermite-Pad\\'e approximation.

  3. Perfect Lattice Perturbation Theory A Study of the Anharmonic Oscillator

    CERN Document Server

    Bietenholz, W

    1999-01-01

    As an application of perfect lattice perturbation theory, we construct an O(\\lambda) perfect lattice action for the anharmonic oscillator analytically in momentum space. In coordinate space we obtain a set of 2-spin and 4-spin couplings \\propto \\lambda, which we evaluate for various masses. These couplings never involve variables separated by more than two lattice spacings. The O(\\lambda) perfect action is simulated and compared to the standard action. We discuss the improvement for the first two energy gaps \\Delta E_1, \\Delta E_2 and for the scaling quantity \\Delta E_2 / \\Delta E1 in different regimes of the interaction parameter, and of the correlation length.

  4. Theoretical requirements for broadband perfect absorption of acoustic waves by ultra-thin elastic meta-films.

    Science.gov (United States)

    Duan, Yuetao; Luo, Jie; Wang, Guanghao; Hang, Zhi Hong; Hou, Bo; Li, Jensen; Sheng, Ping; Lai, Yun

    2015-07-17

    We derive and numerically demonstrate that perfect absorption of elastic waves can be achieved in two types of ultra-thin elastic meta-films: one requires a large value of almost pure imaginary effective mass density and a free space boundary, while the other requires a small value of almost pure imaginary effective modulus and a hard wall boundary. When the pure imaginary density or modulus exhibits certain frequency dispersions, the perfect absorption effect becomes broadband, even in the low frequency regime. Through a model analysis, we find that such almost pure imaginary effective mass density with required dispersion for perfect absorption can be achieved by elastic metamaterials with large damping. Our work provides a feasible approach to realize broadband perfect absorption of elastic waves in ultra-thin films.

  5. Meanings and Distribution of the Perfect in Present-Day American English Prose.

    Science.gov (United States)

    Dubois, Betty Lou

    This paper explores the meanings and distribution of the perfect in contemporary American English prose, with reference to problems encountered in teaching English as a second language. The English perfect comprises forms traditionally called present perfect tense, past perfect tense, and perfects of the infinitive, gerund and present participle.…

  6. Artificial Perfect Electric Conductor-Perfect Magnetic Conductor Anisotropic Metasurface for Generating Orbital Angular Momentum of Microwave with Nearly Perfect Conversion Efficiency

    CERN Document Server

    Chen, Menglin L N; Sha, Wei E I

    2016-01-01

    Orbital angular momentum (OAM) is a promising degree of freedom for fundamental studies in electromagnetics and quantum mechanics. The unlimited state space of OAM shows a great potential to enhance channel capacities of classical and quantum communications. By exploring the Pancharatnam-Berry phase concept and engineering anisotropic scatterers in a metasurface with spatially varying orientations, a plane wave with zero OAM can be converted to a vortex beam carrying nonzero OAM. In this paper, we proposed two types of novel PEC (perfect electric conductor)-PMC (perfect magnetic conductor) anisotropic metasurfaces. One is composed of azimuthally continuous loops and the other is constructed by azimuthally discontinuous dipole scatterers. Both types of metasurfaces are mounted on a mushroom-type high impedance surface. Compared to previous metasurface designs for generating OAM, the proposed ones achieve nearly perfect conversion efficiency. In view of the eliminated vertical component of electric field, the c...

  7. Perfect spin filtering by symmetry in molecular junctions

    Science.gov (United States)

    Li, Dongzhe; Dappe, Yannick J.; Smogunov, Alexander

    2016-05-01

    Obtaining highly spin-polarized currents in molecular junctions is crucial and important for nanoscale spintronics devices. Motivated by our recent symmetry-based theoretical argument for complete blocking of one spin conductance channel in model molecular junctions [A. Smogunov and Y. J. Dappe, Nano Lett. 15, 3552 (2015), 10.1021/acs.nanolett.5b01004], we explore the generality of the proposed mechanism and the degree of achieved spin-polarized current for realistic molecular junctions made of various ferromagnetic electrodes (Ni, Co, Fe) connected by different molecules (quaterthiophene or p -quaterphenyl). A simple analysis of the spin-resolved local density of states of a free electrode allowed us to identify the Fe(110) as the most optimal electrode, providing perfect spin filtering and high conductance at the same time. These results are confirmed by ab initio quantum transport calculations and are similar to those reported previously for model junctions. It is found, moreover, that the distortion of the p -quaterphenyl molecule plays an important role, reducing significantly the overall conductance.

  8. Increase of productivity attacks of young basketbal players on the basis perfection their competitive activity.

    Directory of Open Access Journals (Sweden)

    Kozin V.V.

    2011-02-01

    Full Text Available Research objective is increase of productivity attacks of basketball players 15-17 years on the basis perfection their competitive activity creation of situations of counteractions is carried out by connection of models in the directed programming system of game activity. The system has different character and allows to model individual and group counteractions. The gain of indicators of mental qualities is as a result established, increase of indicators of force and speed qualities, productivity of attacking actions is noted.

  9. Mastering surgical skills through simulation-based learning: Practice makes one perfect

    Directory of Open Access Journals (Sweden)

    Niti Khunger

    2016-01-01

    Full Text Available Simulation-based learning in surgery is a learning model where an environment similar to real life surgical situation is created for the trainee to learn various surgical skills. It can be used to train a new operator as well to assess his skills. This methodology helps in repetitive practice of surgical skills on nonliving things so that the operator can be near-perfect when operating on a live patient. Various models are available for learning different dermatosurgery skills.

  10. How Budget Deficit Impairs Long-Term Growth and Welfare under Perfect Capital Mobility

    OpenAIRE

    2014-01-01

    This paper investigates the implications of the size of budget deficit in the open economy under perfect mobility of capital. For that purpose we construct a general equilibrium model with consumers maximizing the discounted utility of consumption, and firms maximizing profits. Government sets the size of the deficit relative to GDP and controls the structure of public debt. Using standard methods of optimal control theory we solve the model, i.e. we find explicit formulas for all trajectorie...

  11. The Ideology of the Perfect Dictionary: How Efficient Can a ...

    African Journals Online (AJOL)

    rbr

    memory. Lexicographers, in their search for perfection and in compliance with users' wishes, are constantly ..... well as music, history and psychology. Looking at ..... An Experiment Using Electronic Dictionaries with EFL Students. [online].

  12. Perfection and the Bomb: Nuclear Weapons, Teleology, and Motives.

    Science.gov (United States)

    Brummett, Barry

    1989-01-01

    Uses Kenneth Burke's theory of perfection to explore the vocabularies of nuclear weapons in United States public discourse and how "the Bomb" as a God term has gained imbalanced ascendancy in centers of power. (MS)

  13. An improved perfectly matched layer for the eigenmode expansion technique

    DEFF Research Database (Denmark)

    Gregersen, Niels; Mørk, Jesper

    2008-01-01

    When performing optical simulations for rotationally symmetric geometries using the eigenmode expansion technique, it is necessary to place the geometry under investigation inside a cylinder with perfectly conducting walls. The parasitic reflections at the boundary of the computational domain can...

  14. New exact perfect fluid solutions of Einstein's equations. II

    Science.gov (United States)

    Uggla, Claes; Rosquist, Kjell

    1990-12-01

    A family of new spatially homogeneous Bianchi type VIh perfect fluid solutions of the Einstein equations is presented. The fluid flow is orthogonal to the spatially homogeneous hypersurfaces, and the pressure is proportional to the energy density.

  15. The West Perfecting Its Techniques To Hurt China

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Spanish Website Rebellion published an article titled The West Perfecting Its Techniques to Hurt China by U.S. writer, filmmaker and journalist Andre Vltchek on November 12, 2010. Excerpts from the article follow:

  16. Perfect and broadband acoustic absorption by critical coupling

    CERN Document Server

    Romero-García, V; Richoux, O; Merkel, A; Tournat, V; Pagneux, V

    2015-01-01

    We experimentally and analytically report broadband and narrowband perfect absorption in two different acoustic waveguide-resonator geometries by the mechanism of critical coupling. In the first geometry the resonator (a Helmholtz resonator) is side-loaded to the waveguide and it has a moderate quality factor. In the second geometry the resonator (a viscoelastic porous plate) is in-line loaded and it contains two resonant modes with low quality factor. The interplay between the energy leakage of the resonant modes into the waveguide and the inherent losses of the system reveals a perfect and a broadband nearly perfect absorption. The results shown in this work can motivate relevant research for the design of broadband perfect absorbers in other domains of wave physics.

  17. A general framework for perfect simulation of long memory processes

    OpenAIRE

    De Santis, Emilio; Piccioni, Mauro

    2010-01-01

    In this paper a general approach for the perfect simulation of a stationary process with at most countable state space is outlined. The process is specified through a kernel, prescribing the probability of each state conditional to the whole past history. We follow the seminal paper of Comets, Fernandez and Ferrari, where sufficient conditions for the construction of a certain perfect simulation algorithm have been given. We generalize this approach by defining backward coalescence times for ...

  18. Perfect state transfer of quantum walks on quotient graphs

    CERN Document Server

    Bachman, R; Fuller, J; Landry, M; Opperman, M; Tamon, C; Tollefson, A

    2011-01-01

    We study perfect state transfer of quantum walks on graphs using equitable partitions. A main observation we use throughout is that a graph has perfect state transfer if and only if its quotient graph modulo some equitable partition has perfect state transfer. We use this observation to prove the following results: i) If a quotient graph $G/\\pi$ has perfect state transfer for some equitable partition $\\pi$, then $G$ also has perfect state transfer. This lifting property can be used to show that there is a graph $G$ with perfect state transfer between two of its vertices $u$ and $v$ but which has no automorphism mapping $u$ to $v$. This answers a question of Godsil. ii) For a collection of graphs $\\{G_{k}\\}$ and their equitable partitions $\\pi_{k}$, there is an equitable partition $\\pi$ so that $\\Box_{k} (G_{k}/\\pi_{k}) \\cong (\\Box_{k} G_{k})/\\pi$. This generalizes a construction of Feder \\cite{f06} which was obtained from a $k$-boson quantum walk on a single graph. Our construction yields new families of weig...

  19. Whole genome association mapping by incompatibilities and local perfect phylogenies

    Directory of Open Access Journals (Sweden)

    Besenbacher Søren

    2006-10-01

    Full Text Available Abstract Background With current technology, vast amounts of data can be cheaply and efficiently produced in association studies, and to prevent data analysis to become the bottleneck of studies, fast and efficient analysis methods that scale to such data set sizes must be developed. Results We present a fast method for accurate localisation of disease causing variants in high density case-control association mapping experiments with large numbers of cases and controls. The method searches for significant clustering of case chromosomes in the "perfect" phylogenetic tree defined by the largest region around each marker that is compatible with a single phylogenetic tree. This perfect phylogenetic tree is treated as a decision tree for determining disease status, and scored by its accuracy as a decision tree. The rationale for this is that the perfect phylogeny near a disease affecting mutation should provide more information about the affected/unaffected classification than random trees. If regions of compatibility contain few markers, due to e.g. large marker spacing, the algorithm can allow the inclusion of incompatibility markers in order to enlarge the regions prior to estimating their phylogeny. Haplotype data and phased genotype data can be analysed. The power and efficiency of the method is investigated on 1 simulated genotype data under different models of disease determination 2 artificial data sets created from the HapMap ressource, and 3 data sets used for testing of other methods in order to compare with these. Our method has the same accuracy as single marker association (SMA in the simplest case of a single disease causing mutation and a constant recombination rate. However, when it comes to more complex scenarios of mutation heterogeneity and more complex haplotype structure such as found in the HapMap data our method outperforms SMA as well as other fast, data mining approaches such as HapMiner and Haplotype Pattern Mining (HPM

  20. Building the perfect parasite: cell division in apicomplexa.

    Directory of Open Access Journals (Sweden)

    Boris Striepen

    2007-06-01

    Full Text Available Apicomplexans are pathogens responsible for malaria, toxoplasmosis, and crytposporidiosis in humans, and a wide range of livestock diseases. These unicellular eukaryotes are stealthy invaders, sheltering from the immune response in the cells of their hosts, while at the same time tapping into these cells as source of nutrients. The complexity and beauty of the structures formed during their intracellular development have made apicomplexans the darling of electron microscopists. Dramatic technological progress over the last decade has transformed apicomplexans into respectable genetic model organisms. Extensive genomic resources are now available for many apicomplexan species. At the same time, parasite transfection has enabled researchers to test the function of specific genes through reverse and forward genetic approaches with increasing sophistication. Transfection also introduced the use of fluorescent reporters, opening the field to dynamic real time microscopic observation. Parasite cell biologists have used these tools to take a fresh look at a classic problem: how do apicomplexans build the perfect invasion machine, the zoite, and how is this process fine-tuned to fit the specific niche of each pathogen in this ancient and very diverse group? This work has unearthed a treasure trove of novel structures and mechanisms that are the focus of this review.

  1. Two-component perfect fluid in FRW universe

    CERN Document Server

    ,

    2012-01-01

    We propose the cosmological model which allows to describe on equal footing the evolution of matter in the universe on the time interval from the inflation till the domination of dark energy. The matter is considered as a two-component perfect fluid imitated by homogeneous scalar fields between which there is energy exchange. Dark energy is represented by the cosmological constant, which is supposed invariable during the whole evolution of the universe. The matter changes its equation of state with time, so that the era of radiation domination in the early universe smoothly passes into the era of a pressureless gas, which then passes into the late-time epoch, when the matter is represented by a gas of low-velocity cosmic strings. The inflationary phase is described as an analytic continuation of the energy density in the very early universe into the region of small negative values of the parameter which characterizes typical time of energy transfer from one matter component to another. The Hubble expansion ra...

  2. Shared genetic diversity across the global invasive range of the monk parakeet suggests a common restricted geographic origin and the possibility of convergent selection.

    Science.gov (United States)

    Edelaar, Pim; Roques, Severine; Hobson, Elizabeth A; Gonçalves da Silva, Anders; Avery, Michael L; Russello, Michael A; Senar, Juan C; Wright, Timothy F; Carrete, Martina; Tella, José L

    2015-05-01

    While genetic diversity is hypothesized to be an important factor explaining invasion success, there is no consensus yet on how variation in source populations or demographic processes affects invasiveness. We used mitochondrial DNA haplotypic and microsatellite genotypic data to investigate levels of genetic variation and reconstruct the history of replicate invasions on three continents in a globally invasive bird, the monk parakeet (Myiopsitta monachus). We evaluated whether genetic diversity at invasive sites could be explained by (i) the native source populations from which they were derived and (ii) demographic bottlenecks during introduction. Genetic data indicated a localized source area for most sampled invasive populations, with limited evidence for admixing of native source populations. This pattern largely coincides with historical data on pet trade exports. However, the invasive populations are genetically more similar than predicted from the export data alone. The extent of bottleneck effects varied among invasive populations. The observed low genetic diversity, evidence of demographic contraction and restricted source area do not support the hypothesis that invasion is favoured by the mixing and recombining of genetic variation from multiple source populations. Instead, they suggest that reduced genetic variation through random processes may not inhibit successful establishment and invasion in this species. However, convergent selection across invasive sites could also explain the observed patterns of reduction and similarity in genetic variation and/or the restricted source area. In general, the alternative explanation of intraspecific variation in invasive potential among genotypes or geographic areas is neglected, but warrants more attention as it could inform comparative studies and management of biological invaders. © 2015 John Wiley & Sons Ltd.

  3. A Comparative Study of Confucianism,Taoism,Buddhism Monks Systems%儒道佛的僧侣体系比较与现代启示

    Institute of Scientific and Technical Information of China (English)

    张伟

    2015-01-01

    中华民族五千年文明传承创新,多种文化圆融共生,儒道佛乃是其主体。然各教信众层次不一,儒有圣贤,道有真人道长,僧有沙弥比丘,他们各守其道,依其道行及所授戒律而分层。各教修行法门亦有千秋,儒教克己灭欲,道教内丹外丹,佛教八道六度,渐行修法。三教共生互通,入教简单,管理规范,主张内外兼修,劝善嫉恶,对个人德行修养、社会和谐具有借鉴意义。%China has a long history of 5 ,000 years which culture is characterized by Confucianism ,Tao‐ism and Buddhism .However ,they are different in many ways :Confucianism features doctrines abided by saints ,Taoism refers to the theories coined and Buddhism is the religion believed by monks and nuns .Con‐fucians stress self -discipline and restrain .Taoists seek for longevity while Buddhists tend to meditation and self -revelation .They have a lot in common because of suggesting individuals both physically and spiritually ,w hich is beneficial to individual’s self -development and significant for a harmonious society .

  4. A perfect storm? Welfare, care, gender and generations in Uruguay.

    Science.gov (United States)

    Filgueira, Fernando; Gutiérrez, Magdalena; Papadópulos, Jorge

    2011-01-01

    This article claims that welfare states modelled on a contributory basis and with a system of entitlements that assumes stable two-parent families, a traditional breadwinner model, full formal employment and a relatively young age structure are profoundly flawed in the context of present-day challenges. While this is true for affluent countries modelled on the Bismarckian type of welfare system, the costs of the status quo are even more devastating in middle-income economies with high levels of inequality. A gendered approach to welfare reform that introduces the political economy and the economy of care and unpaid work is becoming critical to confront what may very well become a perfect storm for the welfare of these nations and their peoples. Through an in-depth study of the Uruguayan case, the authors show how the decoupling of risk and protection has torn asunder the efficacy of welfare devices in the country. An ageing society that has seen a radical transformation of its family and labour market landscapes, Uruguay maintained during the 1980s and 1990s a welfare state that was essentially contributory, elderly and male-oriented, and centred on cash entitlements. This contributed to the infantilization of poverty, increased the vulnerability of women and exacerbated fiscal stress for the system as a whole. Furthermore, because of high levels of income and asset inequality, the redistribution of risk between upper- and lower-income groups presented a deeply regressive pattern. The political economy of care and welfare has begun to change in the last decade or so, bringing about mild reforms in the right direction; but these might prove to be too little and too late.

  5. Pretty, but dangerous! Records of non-native Monk Parakeets (Myiopsitta monachus) in Mexico ¡Bonita pero peligrosa! Registros de la cotorra argentina (Myiopsitta monachus) en México

    OpenAIRE

    Ian MacGregor-Fors; Rafael Calderón-Parra; Alejandro Meléndez-Herrada; Silvia López-López; Jorge E Schondube

    2011-01-01

    The Monk Parakeet (Myiopsitta monachus) is native to South America and has been introduced by the pet market to several countries around the world. In this note, we compiled records for this species in Mexico and report the first sight-recording of this species in the state of Michoacán and several nesting localities within the Metropolitan area of México City. Most records are of individuals escaped or released from captivity. Also, we review the negative effects that this species has had in...

  6. A symbolic shortest path algorithm for computing subgame-perfect Nash equilibria

    Directory of Open Access Journals (Sweden)

    Góngora Pedro A.

    2015-09-01

    Full Text Available Consider games where players wish to minimize the cost to reach some state. A subgame-perfect Nash equilibrium can be regarded as a collection of optimal paths on such games. Similarly, the well-known state-labeling algorithm used in model checking can be viewed as computing optimal paths on a Kripke structure, where each path has a minimum number of transitions. We exploit these similarities in a common generalization of extensive games and Kripke structures that we name “graph games”. By extending the Bellman-Ford algorithm for computing shortest paths, we obtain a model-checking algorithm for graph games with respect to formulas in an appropriate logic. Hence, when given a certain formula, our model-checking algorithm computes the subgame-perfect Nash equilibrium (as opposed to simply determining whether or not a given collection of paths is a Nash equilibrium. Next, we develop a symbolic version of our model checker allowing us to handle larger graph games. We illustrate our formalism on the critical-path method as well as games with perfect information. Finally, we report on the execution time of benchmarks of an implementation of our algorithms

  7. Dynamics of a perfect fluid through velocity potentials with aplication in quantum cosmology

    CERN Document Server

    Alvarenga, F G; Furtado, R G; Gonçalves, S V B

    2016-01-01

    We review the Eulerian description of hidrodynamics using Seliger-Whitham's formalism (in classical case) and Schutz's formalism (in relativistic case). In these formalisms, the velocity field of a perfect fluid is described by scalar potentials. With this we can obtain the evolution equations of the fluid and its Hamiltonian. In the scenario of quantum cosmology the Schutz's formalism makes it possible to introduce phenomenologically a time variable in minisuperspace models.

  8. Perfectly Matched Layer (PML) for Transient Wave Propagation in a Moving Frame of Reference

    OpenAIRE

    Madsen, Stine Skov; Krenk, Steen; Hededal, Ole

    2013-01-01

    In relation to the development of a Rolling Wheel Deflectometer (RWD), which is a non-destructive testing device for measuring pavement deflections, a finite element model for obtaining the soil/pavement response is developed. Absorbing boundary conditions are necessary in order to prevent reflections of the waves propagating through the soil due to the dynamic loading. The Perfectly Matched Layer (PML) has proven to be highly efficient when solving transient wave propagation problems in a fi...

  9. Heat transfer with thermal relaxation to a perfectly conducting polar fluid

    Energy Technology Data Exchange (ETDEWEB)

    Ezzat, Magdy A.; Zakaria, M. [Alexandria University, Department of Mathematics, Faculty of Education, El-Shatby 21526, Alexandria (Egypt)

    2005-01-01

    The model of boundary-layer equations for a perfectly conducting fluid proposed by M. Ezzat is applied to study the heat transfer with one relaxation time from a non-isothermal stretching sheet on the flow of a polar fluid. The method of the successive approximation is adopted for the solution of two-dimensional problem. The effects of various material parameters on the velocity, angular velocity, and temperature are discussed and illustrated graphically. (orig.)

  10. Dynamics of a Perfect Fluid Through Velocity Potentials with Application in Quantum Cosmology

    Science.gov (United States)

    Alvarenga, F. G.; Fracalossi, R.; Furtado, R. G.; Gonçalves, S. V. B.

    2017-02-01

    We review the Eulerian description of hydrodynamics using Seliger-Whitham's formalism (in classical case) and Schutz's formalism (in relativistic case). In these formalisms, the velocity field of a perfect fluid is described by scalar potentials. With this, we can obtain the evolution equations of the fluid and its Hamiltonian. In the scenario of quantum cosmology, the Schutz's formalism makes it possible to introduce phenomenologically a time variable in minisuperspace models.

  11. Programmatic material on perfection of competition activity of highly skilled basketball players.

    Directory of Open Access Journals (Sweden)

    Sushko Ruslana Aleksandrovna

    2011-09-01

    Full Text Available The special facilities are considered for creation of the programs of correction of training process and perfection of competitiveness activity. Basic estimations and structure of correction of technical tactical actions are resulted. It is set that programmatic material must take into account playing specialization of basketball-player, model indexes. It is also necessary to take into account optimization and modification of existent technologies of estimation of technical tactical actions.

  12. The good, the bad and the perfect

    DEFF Research Database (Denmark)

    Irwin, Alan; Jensen, Torben Elgaard; Kevin E, Jones

    2013-01-01

    Boltanski and Thévenot’s sociology of critical capacity, this article adopts an approach to radical critique that explores its ‘dynamic-yet-patterned’ character. Building upon a ‘translation’ model, but also a framework taken from the martial arts, a reconstruction is offered of one empirical study of lay......Criticism seems to be a recurring and significant characteristic of public engagement exercises – as reflected both in general political discussion and in the academic literature on public engagement with science. This article suggests that rather than being a distraction from the main business...

  13. Thermodynamic Behavior of a Perfect Fluid with Negative Energy Density

    CERN Document Server

    Christensen, W

    2005-01-01

    Starting from a perfect cosmolgical fluid, one class of frequency metrics that satisfies both Einstein's General Relativitic equation and the perfect fluid condition is: g_uv = e^iwt N_uv. Such a metric indicates spacetime behaves locally like a simple harmonic oscillator. During spacetime compressions and rarefactions particles are exuded with a mass equal to the compressive work that produced them. They comprise the cosmic dark matter that makes up this perfect fluid. By treating spacetime as a classical thermodynamic problem, the mass of these particles is determined to be in the range of an axion particle sought by the Lawrence Livermore National Laboratory. When axion particles collide they give off a photon having a microwave frequency inversely equal to that of the frequency of the spacetime compression that produced them. These microwave photons make up the 2.7K cosmic background radiation.

  14. Perfect vortex beam: Fourier transformation of a Bessel beam.

    Science.gov (United States)

    Vaity, Pravin; Rusch, Leslie

    2015-02-15

    We derive a mathematical description of a perfect vortex beam as the Fourier transformation of a Bessel beam. Building on this development, we experimentally generate Bessel-Gauss beams of different orders and Fourier transform them to form perfect vortex beams. By controlling the radial wave vector of a Bessel-Gauss beam, we can control the ring radius of the generated beam. Our theoretical predictions match with the experimental results and also provide an explanation for previous published works. We find the perfect vortex resembles that of an orbital angular momentum (OAM) mode supported in annular profiled waveguides. Our prefect vortex beam generation method can be used to excite OAM modes in an annular core fiber.

  15. The idea of the perfect city in the state of prince Lazar and despotes Stefan Lazarević

    Directory of Open Access Journals (Sweden)

    Radojčić Svetozar

    2008-01-01

    Full Text Available In the beginning, Serb settlers were hostile towards the Greek and Romanic towns they came into contact with. They did not become accustomed to city life until the end of the twelfth century. First of all, this process evolved through the monasteries that were erected as urban ensembles, which, in the Middle Ages were considered to be ideal towns. The Serbs became acquainted with the monastery-city through the monastic settlements on the Holy Mount, from which they also accepted the form and name of the lavra. With them they also accepted the old belief that the monastery was a city and the symbol of the Church and the Heavenly Jerusalem. In the Byzantine world these concepts were connected with Constantinople, which through the laudes Constantinopolitanae was initially hailed as the New Jerusalem, the New Zion and the Heavenly Jerusalem. Such a Constantinople as the image of the earthly and heavenly Jerusalem and the exemplary city of the Orthodox Christian rulers would be emulated by the Slav peoples of Russia, Bulgaria and Serbia. The old Serbian authors particularly extol Constantinople and Thessalonica, calling them imperial cities, safeguarded by God, and cities of God. The ancient ideas about the perfect city, conveyed from Byzantium in the eleventh and twelfth century to Russia, began their renewed life in the Serbian state from the second half of the fourteenth century. In keeping with sources of a literary and religious nature, the author links the course of those complex and ambitious ideas, whereby they wished to explain the ultimate meaning of the construction and existence of the city. The ideas of the similarity of the heavenly and earthly palace and of the similarity of the Heavenly Jerusalem and the earthly city acquired certain clarity in the mentality of the Serbian late feudal society. However, they did not arise from the dynastic concept of the Nemanjić family, which had more realistic economic, military and political

  16. Dual band metamaterial perfect absorber based on Mie resonances

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Xiaoming; Lan, Chuwen; Li, Bo; Zhou, Ji, E-mail: zhouji@tsinghua.edu.cn [State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Bi, Ke [School of Science, Beijing University of Posts and Telecommunications, Beijing 100876 (China); Zhao, Qian [State Key Lab of Tribology, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084 (China)

    2016-08-08

    We numerically and experimentally demonstrated a polarization insensitive dual-band metamaterial perfect absorber working in wide incident angles based on the two magnetic Mie resonances of a single dielectric “atom” with simple structure. Two absorption bands with simulated absorptivity of 99% and 96%, experimental absorptivity of 97% and 94% at 8.45 and 11.97 GHz were achieved due to the simultaneous magnetic and electric resonances in dielectric “atom” and copper plate. Mie resonances of dielectric “atom” provide a simple way to design metamaterial perfect absorbers with high symmetry.

  17. Perfect Entanglement Teleportation via Two Parallel W State Channels

    Institute of Scientific and Technical Information of China (English)

    WANG Mei-Yu; YAN Feng-Li

    2011-01-01

    We present a scheme for perfectly teleporting a two-qubit entangled state via two parallel W state channels. The scheme consists of a positive operator valued measurement (POVM), classical communication and the corresponding local unitary operation. How to realize the POVM using unitary operation and projective measurement is explicitly designed.%@@ We present a scheme for perfectly teleporting a two-qubit entangled state via two parallel W state channels.The scheme consists of a positive operator valued measurement (POVM), classical communication and the corre- sponding local unitary operation.How to realize the POVM using unitary operation and projective measurement is explicitly designed.

  18. On a method of perfect regression using sinusoidal expansion

    CERN Document Server

    Sinha, Nilotpal Kanti

    2011-01-01

    We present a new method of weighted least square regression that gives a curve of fit with any desired degree of accuracy for a given set of data points. By applying this iterative process infinitely, we show that every finite set of coplanar points can be expanded as a sinusoidal series in infinitely many ways. Thus, given any set of finite data points, we can obtain infinitely many perfect regression curves which give a perfect match between the given data points and the values given by the regression.

  19. The general theory of porcupines, perfect and imperfect

    CERN Document Server

    Boyle, Latham

    2010-01-01

    Porcupines are networks of gravitational wave detectors in which the detectors and the distances between them are short relative to the gravitational wavelengths of interest. Perfect porcupines are special configurations whose sensitivity to a gravitational plane wave is independent of the propagation direction or polarization of the wave. I develop the theory of porcupines, including the optimal estimator \\hat{h}^{ij} for the gravitational wave field; useful formulae for the spin-averaged and rotationally-averaged SNR^{2}; and a simple derivation of the properties of perfect porcupines. I apply these results to the interesting class of ``simple'' porcupines, and mention some open problems.

  20. Artificial perfect electric conductor-perfect magnetic conductor anisotropic metasurface for generating orbital angular momentum of microwave with nearly perfect conversion efficiency

    Science.gov (United States)

    Chen, Menglin L. N.; Jiang, Li Jun; Sha, Wei E. I.

    2016-02-01

    Orbital angular momentum (OAM) is a promising degree of freedom for fundamental studies in electromagnetics and quantum mechanics. The unlimited state space of OAM shows a great potential to enhance channel capacities of classical and quantum communications. By exploring the Pancharatnam-Berry phase concept and engineering anisotropic scatterers in a metasurface with spatially varying orientations, a plane wave with zero OAM can be converted to a vortex beam carrying nonzero OAM. In this paper, we proposed two types of novel perfect electric conductor-perfect magnetic conductor anisotropic metasurfaces. One is composed of azimuthally continuous loops and the other is constructed by azimuthally discontinuous dipole scatterers. Both types of metasurfaces are mounted on a mushroom-type high impedance surface. Compared to previous metasurface designs for generating OAM, the proposed ones achieve nearly perfect conversion efficiency. In view of the eliminated vertical component of electric field, the continuous metasurface shows very smooth phase pattern at the near-field region, which cannot be achieved by convectional metasurfaces composed of discrete scatterers. On the other hand, the metasurface with discrete dipole scatterers shows a great flexibility to generate OAM with arbitrary topological charges. Our work is fundamentally and practically important to high-performance OAM generation.

  1. The Horrible Characteristics and the Biblical Archetypal Analysis of THE MONK%论《修道士》的恐怖美学及其圣经渊源

    Institute of Scientific and Technical Information of China (English)

    朱凌玮

    2014-01-01

    With the development of the Gothic novel study , The Monk also received a lot of attention from the researchers .Many of them have a detailed in - depth study already . This paper is based on the analysis of the typical images that appeared in the death of Ambrose , trying to explore its unique aesthetic of terror and cultural origins with The Bible ,having the value of The Monk upgraded in both horizontal and vertical dimensions .%随着哥特小说研究的兴起,《修道士》也越来越受到研究界的重视。立足文本,在通过对安布罗斯之死中出现的典型意象分析的基础上,探讨其独具特色的恐怖美学和其与圣经的文化渊源,在横向与纵向两个维度上完成对《修道士》的价值提升。

  2. Exact EGB models for spherical static perfect fluids

    CERN Document Server

    Hansraj, Sudan; Maharaj, Sunil D

    2015-01-01

    We obtain a new exact solution to the field equations in the EGB modified theory of gravity for a 5-dimensional spherically symmetric static distribution. By using a transformation, the study is reduced to the analysis of a single second order nonlinear differential equation. In general the condition of pressure isotropy produces a first order differential equation which is an Abel equation of the second kind. An exact solution is found. The solution is examined for physical admissability. In particular a set of constants is found which ensures that a pressure-free hypersurface exists which defines the boundary of the distribution. Additionally the isotropic pressure and the energy density are shown to be positive within the radius of the sphere. The adiabatic sound speed criterion is also satisfied within the fluid ensuring a subluminal sound speed. Furthermore, the weak, strong and dominant conditions hold throughout the distribution. On setting the Gauss-Bonnet coupling to zero, an exact solution for 5-dim...

  3. "A Perfect Murder": An (Imperfect) School Theater Program Model

    Science.gov (United States)

    Simon, Nicole S.; Grosso, Andrew

    2009-01-01

    Over the last five years, the Urban Assembly School for Law and Justice (SLJ), a new, small public high school in Brooklyn, and The Essentials, a professional theater company, have joined forces to offer a low-budget, high-quality, in-house afterschool theater program for SLJ students. Both SLJ and The Essentials were in nascent stages when the…

  4. The use of noncrystallographic symmetry averaging to solve structures from data affected by perfect hemihedral twinning.

    Science.gov (United States)

    Sabin, Charles; Plevka, Pavel

    2016-03-01

    Hemihedral twinning is a crystal-growth anomaly in which a specimen is composed of two crystal domains that coincide with each other in three dimensions. However, the orientations of the crystal lattices in the two domains differ in a specific way. In diffraction data collected from hemihedrally twinned crystals, each observed intensity contains contributions from both of the domains. With perfect hemihedral twinning, the two domains have the same volumes and the observed intensities do not contain sufficient information to detwin the data. Here, the use of molecular replacement and of noncrystallographic symmetry (NCS) averaging to detwin a 2.1 Å resolution data set for Aichi virus 1 affected by perfect hemihedral twinning is described. The NCS averaging enabled the correction of errors in the detwinning introduced by the differences between the molecular-replacement model and the crystallized structure. The procedure permitted the structure to be determined from a molecular-replacement model that had 16% sequence identity and a 1.6 Å r.m.s.d. for C(α) atoms in comparison to the crystallized structure. The same approach could be used to solve other data sets affected by perfect hemihedral twinning from crystals with NCS.

  5. Exogenous empirical-evidence equilibria in perfect-monitoring repeated games yield correlated equilibria

    KAUST Repository

    Dudebout, Nicolas

    2014-12-15

    This paper proves that exogenous empirical-evidence equilibria (xEEEs) in perfect-monitoring repeated games induce correlated equilibria of the associated one-shot game. An empirical-evidence equilibrium (EEE) is a solution concept for stochastic games. At equilibrium, agents\\' strategies are optimal with respect to models of their opponents. These models satisfy a consistency condition with respect to the actual behavior of the opponents. As such, EEEs replace the full-rationality requirement of Nash equilibria by a consistency-based bounded-rationality one. In this paper, the framework of empirical evidence is summarized, with an emphasis on perfect-monitoring repeated games. A less constraining notion of consistency is introduced. The fact that an xEEE in a perfect-monitoring repeated game induces a correlated equilibrium on the underlying one-shot game is proven. This result and the new notion of consistency are illustrated on the hawk-dove game. Finally, a method to build specific correlated equilibria from xEEEs is derived.

  6. Magnetoelastic Vibrations of Perfect Conductive Layer in Constant Magnetic Field

    Directory of Open Access Journals (Sweden)

    Vardanov A.H.

    2010-09-01

    Full Text Available The problem of magnetoelastic waves in an isotropic layer is considered. The layer is immersed in magnetic field and have properties of perfect conductor. The magnetic field is perpendicular to the plane of wave motion. One side of the layer is clamped, and the other is free from mechanical loads. The dispersion equation is derived. Calculated the phase velocity ratio.

  7. The Meaning of the Perfective Aspect in Russian.

    Science.gov (United States)

    Ferrell, James

    1951-01-01

    Descriptions of the perfective aspect in Russian taken from Miklosich, Saxmatov, Peskovsky, Fortunatov, and Karcevskij serve as background reading to the author's discussion of the problem. He explores three basic questions: (1) Is aspect a Russian problem in grammar or lexicography; (2) What is the nature of the correlation between the perfective…

  8. Low-frequency scattering from two-dimensional perfect conductors

    DEFF Research Database (Denmark)

    Hansen, Thorkild; Yaghjian, A.D

    1991-01-01

    Exact expressions have been obtained for the leading terms in the low-frequency expansions of the far fields scattered from three different types of two-dimensional perfect conductors: a cylinder with finite cross section, a cylindrical bump on an infinite ground plane, and a cylindrical dent...

  9. Standardizing and Perfecting Administrative Execution Law of Product Quality

    Institute of Scientific and Technical Information of China (English)

    范智鹏

    2014-01-01

    At present the problems exist more and more in the process of law enforcement in our products quality, so the writer put forward some suggestions for standardizing and perfecting administrative execution law of product quality from the enforcer, government, supervision department, the lawenforcement environment and so on.

  10. Unity and Duality in Barack Obama's "A More Perfect Union"

    Science.gov (United States)

    Terrill, Robert E.

    2009-01-01

    Faced with a racialized political crisis that threatened to derail his campaign to become the first African American president of the United States, Barack Obama delivered a speech on race titled "A More Perfect Union." He begins by portraying himself as an embodiment of double consciousness, but then invites his audience to share his…

  11. The Perfect Storm—Genetic Engineering, Science, and Ethics

    Science.gov (United States)

    Rollin, Bernard E.

    2012-07-01

    Uncertainty about ethics has been a major factor in societal rejection of biotechnology. Six factors help create a societal "perfect storm" regarding ethics and biotechnology: Social demand for ethical discussion; societal scientific illiteracy; poor social understanding of ethics; a "Gresham's Law for Ethics;" Scientific Ideology; vested interests dominating ethical discussion. How this can be remedied is discussed.

  12. MEMS and Metamaterials: A Perfect Marriage at Terahertz Frequencies

    Science.gov (United States)

    2012-08-01

    transverse magnetic (TM) radiation. Flexible THz Wide Angle “Perfect” Absorbers Physical Review B, 78 (24), 2008 Terahertz metamaterial absorber...and Metamaterials: A Perfect Marriage at Terahertz Frequencies Frequency Tunable Terahertz Metamaterials Physical Review B, 83 (19), 2011 Frequency...Magnetic resonance Electric resonance Physical Review Letters, 103 (14), 2009 Structurally Tunable THz Metamaterials • We demonstrate reconfigurable

  13. An improved perfectly matched layer in the eigenmode expansion technique

    DEFF Research Database (Denmark)

    Gregersen, Niels; Mørk, Jesper

    2008-01-01

    When employing the eigenmode expansion technique (EET), parasitic reflections at the boundary of the computational domain can be suppressed by introducing a perfectly matched layer (PML). However, the traditional PML, suffers from an artificial field divergence limiting its usefulness. We propose...

  14. Perfect Worlds : Utopian Fiction in China and the West

    NARCIS (Netherlands)

    Fokkema, Douwe

    2011-01-01

    Perfect Worlds biedt een uitgebreide historische analyse van utopische verhalen in de Chinese en Euro-Amerikaanse traditie. Verschillende hoofdstukken gaan onder meer in op de kritiek van Thomas More op Plato, de Europese oriëntalistische speurtocht naar utopieën in China, Dostoevsky’s reactie op

  15. Perfect Worlds : Utopian Fiction in China and the West

    NARCIS (Netherlands)

    Fokkema, Douwe

    2011-01-01

    Perfect Worlds biedt een uitgebreide historische analyse van utopische verhalen in de Chinese en Euro-Amerikaanse traditie. Verschillende hoofdstukken gaan onder meer in op de kritiek van Thomas More op Plato, de Europese oriëntalistische speurtocht naar utopieën in China, Dostoevsky’s reactie op Ch

  16. Perfect Worlds : Utopian Fiction in China and the West

    NARCIS (Netherlands)

    Fokkema, Douwe

    2011-01-01

    Perfect Worlds biedt een uitgebreide historische analyse van utopische verhalen in de Chinese en Euro-Amerikaanse traditie. Aan bod komen onder meer de kritiek van Thomas More op Plato, de Europese oriëntalistische speurtocht naar utopieën in China en Chinese schrijvers die hun confucianistische uto

  17. Experimental Realization of Perfect Discrimination for Two Unitary Operations

    Institute of Scientific and Technical Information of China (English)

    LIU Jian-Jun; HONG Zhi

    2008-01-01

    We experimentally demonstrate perfect discrimination between two unitary operations by using the sequential scheme proposed by Duan et al.[Phys. Rev. Lett. 98 (2007) 100503] Also, we show how to understand the scheme and to calculate the parameters for two-dimensional operations in the picture of the Bloch sphere.

  18. The Perfect Storm--Genetic Engineering, Science, and Ethics

    Science.gov (United States)

    Rollin, Bernard E.

    2014-01-01

    Uncertainty about ethics has been a major factor in societal rejection of biotechnology. Six factors help create a societal "perfect storm" regarding ethics and biotechnology: Social demand for ethical discussion; societal scientific illiteracy; poor social understanding of ethics; a "Gresham's Law for Ethics;" Scientific…

  19. Extending a perfect matching to a Hamiltonian cycle

    DEFF Research Database (Denmark)

    Alahmadi, Adel; Aldred, Robert E. L.; Alkenani, Ahmad;

    2015-01-01

    In 1993 Ruskey and Savage conjectured that in the d-dimensional hypercube, every matching M can be extended to a Hamiltonian cycle. Fink verified this for every perfect matchingM, remarkably even ifM contains external edges. We prove that this property also holds for sparse spanning regular subgr...

  20. Absolute instruments and perfect imaging in geometrical optics

    CERN Document Server

    Tyc, Tomas; Sarbort, Martin; Bering, Klaus

    2011-01-01

    We investigate imaging by spherically symmetric absolute instruments that provide perfect imaging in the sense of geometrical optics. We derive a number of properties of such devices, present a general method for designing them and use this method to propose several new absolute instruments, in particular a lens providing a stigmatic image of an optically homogeneous region and having a moderate refractive index range.

  1. The Perfect Storm--Genetic Engineering, Science, and Ethics

    Science.gov (United States)

    Rollin, Bernard E.

    2014-01-01

    Uncertainty about ethics has been a major factor in societal rejection of biotechnology. Six factors help create a societal "perfect storm" regarding ethics and biotechnology: Social demand for ethical discussion; societal scientific illiteracy; poor social understanding of ethics; a "Gresham's Law for Ethics;" Scientific…

  2. Unknowability of Quantum State forbids perfectly quantum operations

    Institute of Scientific and Technical Information of China (English)

    CAIQing-yu; LIBai-wen

    2004-01-01

    We analyze the oonnection between quantum operations and accessible information. And we find that the accessible information decreases under quantum operations. We show that it is impossible to perfectly manipulate an unknown state in an open quantum system. That the accessible information decreases under quantum operations gives a fundamental limitation in the microscopic world.

  3. The Future for Higher Education: Sunrise or Perfect Storm?

    Science.gov (United States)

    Hilton, James

    2006-01-01

    In today's knowledge economy, the role of higher education is being redefined--not simply tweaked and fine-tuned but, rather, fundamentally redefined. The author contends that there are at least two ways to frame this future for higher education. The first is to view it as a perfect storm, born from the convergence of numerous disruptive forces.…

  4. Perfect 2-colorings of the generalized Petersen graph

    Indian Academy of Sciences (India)

    MEHDI ALAEIYAN; HAMED KARAMI

    2016-08-01

    In this paper, we enumerate the parameter matrices of all perfect 2-colorings of the generalized Petersen graphs $GP(n, 2)$, where $n \\geq 5$. We also present some basic results for $GP(n, k)$, where $n \\geq 5$ and $k \\geq 3$.

  5. Perfect state transfer, integral circulants and join of graphs

    CERN Document Server

    Angeles-Canul, Ricardo Javier; Opperman, Michael C; Paribello, Christopher C; Russell, Matthew C; Tamon, Christino

    2009-01-01

    We propose new families of graphs which exhibit quantum perfect state transfer. Our constructions are based on the join operator on graphs, its circulant generalizations, and the Cartesian product of graphs. We build upon the results of Ba\\v{s}i\\'{c} et al \\cite{bps09,bp09} and construct new integral circulants and regular graphs with perfect state transfer. More specifically, we show that the integral circulant $\\textsc{ICG}_{n}(\\{2,n/2^{b}\\} \\cup Q)$ has perfect state transfer, where $b \\in \\{1,2\\}$, $n$ is a multiple of 16 and $Q$ is a subset of the odd divisors of $n$. Using the standard join of graphs, we also show a family of double-cone graphs which are non-periodic but exhibit perfect state transfer. This class of graphs is constructed by simply taking the join of the empty two-vertex graph with a specific class of regular graphs. This answers a question posed by Godsil \\cite{godsil08}.

  6. Uniform perfectness of the attractor of bi-Lipschitz IFS

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    In this paper, we prove that the attractor of C1, α bi-Lipschitz IFS in R is uniformly perfect if it is not a singleton. Then we construct an example to show that this does not hold for C1 bi-Lipschitz IFS in Rn.

  7. Cognitive Learning Styles: Can You Engineer a "Perfect" Match?

    Science.gov (United States)

    Khuzzan, Sharifah Mazlina Syed; Goulding, Jack Steven

    2016-01-01

    Education and training is widely acknowledged as being one of the key factors for leveraging organisational success. However, it is equally acknowledged that skills development and the acquisition of learning through managed cognitive approaches has yet to provide a "perfect" match. Whilst it is argued that an ideal learning scenario…

  8. Unknowability of Quantum State forbids perfectly quantum operations

    Institute of Scientific and Technical Information of China (English)

    CAI Qing-yu; LI Bai-wen

    2004-01-01

    We analyze the connection between quantum operations and accessible information. And we find that the accessible information decreases under quantum operations. We show that it is impossible to perfectly manipulate an unknown state in an open quantum system. That the accessible information decreases under quantum operations gives a fundamental limitation in the microscopic world.

  9. The Perfect Storm and the Privatization of Public Higher Education

    Science.gov (United States)

    Ehrenberg, Ronald G.

    2006-01-01

    During the last quarter of a century, public higher education institutions have found themselves buffeted by a perfect storm. This storm has led to discussions about the privatization of those institutions, which has implications for their ability to improve, or at least maintain, their quality and their accessibility to students from all…

  10. Perfect Power Prototype for Illinois Institute of Technology

    Energy Technology Data Exchange (ETDEWEB)

    Shahidehpour, Mohammad [Illinois Inst. Of Technology, Chicago, IL (United States)

    2014-09-30

    Starting in October 2008, Illinois Institute of Technology (IIT), in collaboration with over 20 participating members, led an extensive effort to develop, demonstrate, promote, and commercialize a microgrid system and offer supporting technologies that will achieve Perfect Power at the main campus of IIT. A Perfect Power system, as defined by the Galvin Electricity Initiative (GEI), is a system that cannot fail to meet the electric needs of the individual end-user. The Principle Investigator of this Perfect Power project was Dr. Mohammad Shahidehpour, Director of the Robert W. Galvin Center for Electricity Innovation at IIT. There were six overall objectives of the Perfect Power project: (1) Demonstrate the higher reliability introduced by the microgrid system at IIT; (2) Demonstrate the economics of microgrid operations; (3) Allow for a decrease of fifty percent (50%) of grid electricity load; (4) Create a permanent twenty percent (20%) decrease in peak load from 2007 level; (5) Defer planned substation through load reduction; (6) Offer a distribution system design that can be replicated in urban communities.

  11. Indefinite and Continuative Interpretations of the English Present Perfect

    Directory of Open Access Journals (Sweden)

    Katarina Dea Žetko

    2005-06-01

    Full Text Available The objective of our paper is to demonstrate that the English present perfect is not by inherent meaning either indefinite or continuative. Notions like indefinite and continuative are contextdependent interpretations of whole constructions and their broader context. However, continuative interpretation can also be triggered by certain adverbials, negative constructions and verbs in the progressive form. But, even these factors do not always guarantee continuative interpretations. Construction, continuative meaning can be cancelled by the context in a broader sense, this fact being a proof that this meaning is merely an implicature. We will demonstrate how different factors interact and trigger either indefinite or continuative interpretations which are not inherent in the present perfect itself. Our paper will attempt to provide sufficient evidence that there is no indefinite/continuative distinction in the English present perfect, the inherent meaning or function of the present perfect is merely to locate the situation somewhere within a period that starts before the time of utterance and leads up to it.

  12. Quantum propagator in the presence of a perfectly reflecting wall

    Energy Technology Data Exchange (ETDEWEB)

    Cacciari, Ilaria [Istituto di Fisica Applicata ' Nello Carrara' , CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze (Italy); Lantieri, Marco [Istituto dei Sistemi Complessi, CNR, Sezione di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze (Italy); Moretti, Paolo [Istituto dei Sistemi Complessi, CNR, Sezione di Firenze, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze (Italy)]. E-mail: paolo.moretti@isc.cnr.it

    2007-05-21

    The transmission propagator for an arbitrary, finite range one-dimensional potential in the presence of a perfectly reflecting wall is calculated starting from the integral form of the Schroedinger equation. After a Laplace transform, the solution is obtained in a new and simple form by using matrix methods; we apply the results to an array of delta potentials.

  13. Mathematicians and the perfect language: Giuseppe Peano's case

    Directory of Open Access Journals (Sweden)

    Gouthier Daniele

    2002-03-01

    Full Text Available Attempts to create an International Artificial Language (IAL have kept pace with the evolution of modern science. Ever since Galileo’s time, scientists have been interested in how to create a perfect language (the adjective “perfect” takes on the meaning of “universal” or “unambiguous” depending on the period capable of supporting communication at a horizontal level i.e. within the scientific community, and at a vertical level, i.e. between scientists and the public. The first goal of this article is to describe briefly how this need for a perfect language developed over the past years. Special attention will be spent on the mathematicians’ role, especially Giuseppe Peano’s. The second goal is to illustrate how Giuseppe Peano’s contribution to this debate proved twofold and led to various conclusions. The Italian mathematician played a leading role in the creation of a perfect language, both at a horizontal and a vertical level. On the one hand, there is his successful attempt to introduce a standard logical and symbolic system of notation, which became essential for communication among mathematicians. On the other hand, there is the complete failure of his ambitious Latino sine flexione (Latin without inflection, a perfect language which died with its creator.

  14. Queer eye for the ascetic guy? Homoeroticism, children, and the making of Monks in late antique Egypt.

    Science.gov (United States)

    Schroeder, Caroline T

    2009-01-01

    A famous instruction about children in monasteries reads: "Do not bring young boys here. Four churches in Scetis are deserted because of boys." Taken from the Sayings of the Desert Fathers, this apophthegm exposes the presence of homoeroticism and anxieties about the homoerotic, especially erotic encounters with children, in early Christian ascetic communities. This essay examines the construction of male sexuality in early Egyptian monasticism, focusing on the Sayings and the rules of the monastic leader Shenoute of Atripe It argues that the masculine ascetic ideal builds upon certain classical ideals of masculinity, especially the control of the passions, but purports to eschew classical models of eroticism in which the adolescent male represents the ideal sexual partner. However, these sources are designed to be recited or retold as edifying texts; despite their overt disavowal of sexual contact between men and boys, their retelling and rereading keeps homoeroticism and the representation of boys as sexually desirable objects alive in the ascetic imagination.

  15. Random perfect lattices and the sphere packing problem.

    Science.gov (United States)

    Andreanov, A; Scardicchio, A

    2012-10-01

    Motivated by the search for best lattice sphere packings in Euclidean spaces of large dimensions we study randomly generated perfect lattices in moderately large dimensions (up to d=19 included). Perfect lattices are relevant in the solution of the problem of lattice sphere packing, because the best lattice packing is a perfect lattice and because they can be generated easily. Their number, however, grows superexponentially with the dimension, so to get an idea of their properties we propose to study a randomized version of the generating algorithm and to define a random ensemble with an effective temperature in a way reminiscent of a Monte Carlo simulation. We therefore study the distribution of packing fractions and kissing numbers of these ensembles and show how as the temperature is decreased the best known packers are easily recovered. We find that, even at infinite temperature, the typical perfect lattices are considerably denser than known families (like A(d) and D(d)), and we propose two hypotheses between which we cannot distinguish in this paper: one in which they improve the Minkowsky bound φ~2(-(0.84±0.06)d), and a competitor in which their packing fraction decreases superexponentially, namely, φ~d(-ad) but with a very small coefficient a=0.06±0.04. We also find properties of the random walk which are suggestive of a glassy system already for moderately small dimensions. We also analyze local structure of network of perfect lattices conjecturing that this is a scale-free network in all dimensions with constant scaling exponent 2.6±0.1.

  16. Perfection of Apoferritin Crystals: An Advanced X-Ray Imaging and Diffraction Study

    Science.gov (United States)

    Hu, Z. W.; Thomas, B. R.; Chernov, A. A.; Chu, Y. S.

    2003-01-01

    Ferritin is a well-known iron-storage protein, and is a spherical shell that consists of 24 identical subunits packed in a 432 symmetry. The typically large protein size and its distinction from lysozyme as to chemical and physical characteristics make ferritin an attractive model protein for crystal growth and perfection investigation-as an alternative to the most widely studied lysozyme. In this contribution, the latest results obtained from coherence-based x-ray diffraction imaging and diffraction experiments will be presented on octahedral apoferritin (a demetalized form of ferritin) crystals grown from various growth conditions. Crystal specimens, which have the measured rocking-curve widths varying from a few arcseconds to several tens arcseconds (or more), are comparatively examined by intrinsically highly sensitive mapping of lattice perfection and defects. The richness of the observed defects and growth features offers insight into perfection and growth of protein crystals. Beautiful interference fringe patterns formed in diffraction images and fine oscillation structure of rocking curves observed will be discussed for understanding of physical origins and the underlying impact.

  17. Perfectionism among Chinese Gifted and Nongifted Students in Hong Kong: The Use of the Revised Almost Perfect Scale

    Science.gov (United States)

    Chan, David W.

    2011-01-01

    This study investigated the structure of perfectionism based on the almost Perfect Scale-Revised with a sample of 320 gifted students aged 7 to 12 and a sample of 882 nongifted students of similar ages in Hong Kong. Multigroup confirmatory factor analyses across the two student groups supported a common three-dimensional model that included…

  18. An Analysis of a Perfect Friend in Sherlock

    Institute of Scientific and Technical Information of China (English)

    陈晓旭

    2015-01-01

    There are countless teleplays describing the detective stories, but none of which likes the film Sherlock is full ofa perfect image of man, a perfect man should not just be successful in career, but pay more attention to care for his friends and families and should be kind to all of people.%描述侦探故事的电影不胜枚举,但是没有哪一部电影像《神探夏洛克》一样充满了一个完美男人的形象,一个完美的男人所要具备的不仅仅是事业上的成功,更重要的是关爱朋友和家人友善对待他人。

  19. Almost perfectly symmetric SWCNT-based CMOS devices and scaling.

    Science.gov (United States)

    Zhang, Zhiyong; Wang, Sheng; Wang, Zhenxing; Ding, Li; Pei, Tian; Hu, Zhudong; Liang, Xuelei; Chen, Qing; Li, Yan; Peng, Lian-Mao

    2009-11-24

    Symmetric n- and p-type field-effect transistors (FETs) have been fabricated on the same undoped single-walled carbon nanotube (SWCNT). The polarity of the FET is defined by controlled injection of electrons (n-type, via Sc electrodes) or holes (p-type, via Pd electrodes) into the SWCNT, instead of via chemically doping the SWCNT. The SWCNT-based FETs with different channel lengths show a clear trend of performance improvement for channel length scaling. Taking full advantage of the perfect symmetric band structure of the semiconductor SWCNT, a perfect SWCNT-based CMOS inverter is demonstrated, which gives a voltage gain of over 160, and for the two adjacent n- and p-type FETs fabricated on the same SWCNT, high field mobility is realized simultaneously for electrons (3000 cm(2)/V.s) and holes (3300 cm(2)/V.s).

  20. Perfect spin filtering effect in ultrasmall helical zigzag graphene nanoribbons

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Zi-Yue, E-mail: zzy8423@jiangnan.edu.cn

    2017-02-05

    The spin-polarized transport properties of helical zigzag graphene nanoribbons (ZGNRs) are investigated by first-principles calculations. It is found that although all helical ZGNRs have similar density of states and edge states, they show obviously different transport characteristics depending on the curling manners. ZGNRs curled along zigzag orientation exhibit perfect spin filtering effect with a large spin-split gap near the Fermi level, while ZGNRs curled along armchair orientation behave as conventional conductors for both two spin channels. The spin filtering effect will be weakened with the increase of either ribbon width or curling diameter. The results suggest that ultrasmall helical ZGNRs have important potential applications in spintronics and flexible electronics. - Highlights: • Perfect spin filtering effect has been found in helical ZGNRs. • The effect strongly depends on the curling manners of ZGNRs. • Different transport properties do not induced by distinct electronic properties. • The effect may be weakened with increasing either ribbon width or curling diameter.

  1. Perfect imaging in the optical domain using dielectric materials

    CERN Document Server

    Gabrielli, Lucas H; Lipson, Michal

    2010-01-01

    The promise of perfect imaging in the optical domain, where light can be imaged without aberrations and with ultra-high resolution, could revolutionize technology and nanofabrication [1, 2, 3, 4, 5, 6]. Recently it has been shown theoretically that perfect imaging can be achieved in a dielectric medium with spatially varying refractive index [7, 8]. The lens geometry is defined using transformation optics [9, 10, 11, 12, 13, 14, 15] for projecting a spherical space onto a real plane space, forming Maxwells fish eye [16, 17, 18, 19]. Most transformation optics demonstrations have been achieved for Euclidean spaces and in the microwave regime, due to ease of fabrication. Here we demonstrate a transformation to a non-Euclidean space [20] in the optical regime using silicon nanophotonic structures.

  2. Ultra-thin metamaterial for perfect and omnidirectional sound absorption

    CERN Document Server

    Jiménez, Noé; Romero-García, Vicent; Pagneux, Vincent; Groby, Jean-Philippe

    2016-01-01

    Using the concepts of slow sound and of critical coupling, an ultra-thin acoustic metamaterial panel for perfect and omnidirectional absorption is theoretically and experimentally conceived in this work. The system is made of a rigid panel with a periodic distribution of thin closed slits, the upper wall of which is loaded by Helmholtz Resonators (HRs). The presence of resonators produces a slow sound propagation shifting the resonance frequency of the slit to the deep sub-wavelength regime ($\\lambda/88$). By controlling the geometry of the slit and the HRs, the intrinsic visco-thermal losses can be tuned in order to exactly compensate the energy leakage of the system and fulfill the critical coupling condition to create the perfect absorption of sound in a large range of incidence angles due to the deep subwavelength behavior.

  3. Thermodynamics of perfect fluids from scalar field theory

    CERN Document Server

    Ballesteros, Guillermo; Pilo, Luigi

    2016-01-01

    The low-energy dynamics of relativistic continuous media is given by a shift-symmetric effective theory of four scalar fields. These scalars describe the embedding in spacetime of the medium and play the role of Stuckelberg fields for spontaneously broken spatial and time translations. Perfect fluids are selected imposing a stronger symmetry group or reducing the field content to a single scalar. We explore the relation between the field theory description of perfect fluids to thermodynamics. By drawing the correspondence between the allowed operators at leading order in derivatives and the thermodynamic variables, we find that a complete thermodynamic picture requires the four Stuckelberg fields. We show that thermodynamic stability plus the null energy condition imply dynamical stability. We also argue that a consistent thermodynamic interpretation is not possible if any of the shift symmetries is explicitly broken.

  4. Plus-minus construction leads to perfect invisibility

    CERN Document Server

    Nacher, J C

    2010-01-01

    Recent theoretical advances applied to metamaterials have opened new avenues to design a coating that hides objects from electromagnetic radiation and even the sight. Here, we propose a new design of cloaking devices that creates perfect invisibility in isotropic media. A combination of positive and negative refractive indices, called plus-minus construction, is essential to achieve perfect invisibility (i.e., no time delay and total absence of reflection). Contrary to the common understanding that between two isotropic materials having different refractive indices the electromagnetic reflection is unavoidable, our method shows that surprisingly the reflection phenomena can be completely eliminated. The invented method, different from the classical impedance matching, may also find electromagnetic applications outside of cloaking devices, wherever distortions are present arising from reflections.

  5. Piston motion in the perfect-conductive magnetizable uncompressible fluid

    Energy Technology Data Exchange (ETDEWEB)

    Naletova, V.A.

    1977-01-01

    A solution is given for the movement of a perfect conductive solid horizontal piston at a constant velocity u, parallel to the plane of the piston, in a perfect conductive magnetizable uncompressible fluid in an applied magnetic field H/sub 0/. Either a shock wave, a centered wave, or a alvenian fracture, or a combination of an alvenian fracture and waves can be propagated in front of the piston under these conditions. In this case either the shock or centered wave is propagated at first, followed by the movement of the alvenian fracture. Either case is manifested at such velocities. When the piston moves along the boundary, the piston-medium can flow as a surface current which can be found from the solution to the problem. 3 references, 3 figures.

  6. Quantitative angle-resolved small-spot reflectance measurements on plasmonic perfect absorbers: impedance matching and disorder effects.

    Science.gov (United States)

    Tittl, Andreas; Harats, Moshe G; Walter, Ramon; Yin, Xinghui; Schäferling, Martin; Liu, Na; Rapaport, Ronen; Giessen, Harald

    2014-10-28

    Plasmonic devices with absorbance close to unity have emerged as essential building blocks for a multitude of technological applications ranging from trace gas detection to infrared imaging. A crucial requirement for such elements is the angle independence of the absorptive performance. In this work, we develop theoretically and verify experimentally a quantitative model for the angular behavior of plasmonic perfect absorber structures based on an optical impedance matching picture. To achieve this, we utilize a simple and elegant k-space measurement technique to record quantitative angle-resolved reflectance measurements on various perfect absorber structures. Particularly, this method allows quantitative reflectance measurements on samples where only small areas have been nanostructured, for example, by electron-beam lithography. Combining these results with extensive numerical modeling, we find that matching of both the real and imaginary parts of the optical impedance is crucial to obtain perfect absorption over a large angular range. Furthermore, we successfully apply our model to the angular dispersion of perfect absorber geometries with disordered plasmonic elements as a favorable alternative to current array-based designs.

  7. Overlapped illusion optics: a perfect lens brings a brighter feature

    Science.gov (United States)

    Xu, Yadong; Du, Shengwang; Gao, Lei; Chen, Huanyang

    2011-02-01

    In this paper, we show that a perfect lens can be employed to make multiple objects appear like only one object in the far field, leading to a new concept in illusion optics. Numerical simulations have been performed to verify the functionalities for both passive and active objects. The conceptual device can be utilized to enhance the illumination brightness for both incoherent and coherent systems.

  8. Limitations of the Standard Gravitational Perfect Fluid Paradigm

    CERN Document Server

    Cox, David; O'Brien, James

    2009-01-01

    We show that the standard perfect fluid paradigm is not necessarily a valid description of a steady state gravitational source unless the background geometry has very high symmetry. By incoherently averaging over a compete set of modes of a scalar field propagating in a curved background, we show that for a static, spherically symmetric geometry the energy-momentum tensor that ensues will in general be of the form $T_{\\mu\

  9. Coherent perfect absorption mediated anomalous reflection and refraction.

    Science.gov (United States)

    Dutta-Gupta, Shourya; Deshmukh, Rahul; Venu Gopal, Achanta; Martin, Olivier J F; Dutta Gupta, S

    2012-11-01

    We show bending of light on the same side of the normal in a free-standing corrugated metal film under bidirectional illumination. Coherent perfect absorption (CPA) is exploited to suppress the specular zeroth order leading to effective back-bending of light into the "-1" order, while the "+1" order is resonant with the surface mode. The effect is shown to be phase sensitive, yielding CPA and superscattering in the same geometry.

  10. A Perfect Storm: The Dynamics Confronting U.S. Agribusiness

    Science.gov (United States)

    2008-01-01

    should assign one existing federal agency the lead in addressing the water resource challenges that face America in general and agribusiness in...These cuts will have a particular impact on food relief efforts in Latin America , Central Asia and Africa. With the United States supplying half...0 Spring 2008 Industry Study Final Report Agribusiness Industry A Perfect Storm: The Dynamics Confronting U.S. Agribusiness

  11. Quality strategies implemented within the tourism agency Perfect Tour

    Directory of Open Access Journals (Sweden)

    Madar, A.

    2012-01-01

    Full Text Available The paper presents the quality strategies adopted by the tourism agency Perfect Tour. The most important advantages of the Romanian agency in comparison with its competitors are: the focus on high quality services, cooperation with other international agencies, entering new fields like medical tourism and sole representative of Disneyland Paris. The strategies adopted explain the good financial results even in the period of crisis.

  12. Overlapped illusion optics: a perfect lens brings a brighter feature

    Energy Technology Data Exchange (ETDEWEB)

    Xu Yadong; Gao Lei; Chen Huanyang [School of Physical Science and Technology, Soochow University, Suzhou, Jiangsu 215006 (China); Du Shengwang, E-mail: kenyon@ust.hk [Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong)

    2011-02-15

    In this paper, we show that a perfect lens can be employed to make multiple objects appear like only one object in the far field, leading to a new concept in illusion optics. Numerical simulations have been performed to verify the functionalities for both passive and active objects. The conceptual device can be utilized to enhance the illumination brightness for both incoherent and coherent systems.

  13. Coherent perfect absorption mediated anomalous reflection and refraction

    CERN Document Server

    Dutta-Gupta, Shourya; Gopal, Achanta Venu; Martin, Olivier J F; Gupta, S Dutta

    2012-01-01

    We demonstrate bending of light on the same side of the normal in a free standing corrugated metal film under bi-directional illumination. Coherent perfect absorption (CPA) is exploited to suppress the specular zeroth order leading to effective back-bending of light into the `-1' order, while the `+1' order is resonant with the surface mode. The effect is shown to be phase sensitive yielding CPA and superscattering in the same geometry.

  14. Ruins of Yuanmingyuan(Garden of Perfect Splendor)

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    LOCATED in the northwestern outskirts of Beijing, the world-renowned Yuanmingyuan was built as an imperial playground during the flourishing period of the Qing Dynasty (1644-1911). Yuanmingyuan included three separate areas: The Garden of Perfect Splendor, The Garden of Everlasting Spring and The Garden of Blossoming Sping (later renamed as the Garden of Ten Thousand Spring Seasons). The three gardens covered an area of nearly

  15. Characterization of quantum circulant networks having perfect state transfer

    Science.gov (United States)

    Bašić, Milan

    2013-01-01

    In this paper we answer the question of when circulant quantum spin networks with nearest-neighbor couplings can give perfect state transfer. The network is described by a circulant graph G, which is characterized by its circulant adjacency matrix A. Formally, we say that there exists a perfect state transfer (PST) between vertices {a,bin V(G)} if | F( τ) ab | = 1, for some positive real number τ, where F( t) = exp(i At). Saxena et al. (Int J Quantum Inf 5:417-430, 2007) proved that | F( τ) aa | = 1 for some {ain V(G)} and {tauin {R}^+} if and only if all eigenvalues of G are integer (that is, the graph is integral). The integral circulant graph ICG n ( D) has the vertex set Z n = {0, 1, 2, . . . , n - 1} and vertices a and b are adjacent if {gcd(a-b,n)in D} , where {D subseteq {d : d mid n, 1 ≤ d < n}} . These graphs are highly symmetric and have important applications in chemical graph theory. We show that ICG n ( D) has PST if and only if {nin 4{N}} and {D=widetilde{D_3} \\cup D_2\\cup 2D_2\\cup 4D_2|cup {n/2^a}} , where {widetilde{D_3}={din D | n/din 8{N}}, D_2= {din D | n/din 8{N}+4}{setminus}{n/4}} and {ain{1,2}} . We have thus answered the question of complete characterization of perfect state transfer in integral circulant graphs raised in Angeles-Canul et al. (Quantum Inf Comput 10(3&4):0325-0342, 2010). Furthermore, we also calculate perfect quantum communication distance (distance between vertices where PST occurs) and describe the spectra of integral circulant graphs having PST. We conclude by giving a closed form expression calculating the number of integral circulant graphs of a given order having PST.

  16. Controllable coherent perfect absorption in a composite film

    CERN Document Server

    Dutta-Gupta, Shourya; Gupta, S Dutta; Agarwal, G S

    2011-01-01

    We exploit the versatility provided by metal--dielectric composites to demonstrate controllable coherent perfect absorption (CPA) in a slab of heterogeneous medium. The slab is illuminated by coherent light from both sides, at the same angle of incidence and the conditions required for CPA are investigated as a function of the different geometrical parameters. The simultaneous realization of CPA at two distinct frequencies is also shown. Finally, our calculations clearly elucidate the role of absorption as a necessary prerequisite for CPA.

  17. Albanese varieties of singular varieties over a perfect field

    CERN Document Server

    Russell, Henrik

    2011-01-01

    Let X be a projective variety, possibly singular. A generalized Albanese variety of X was constructed by Esnault, Srinivas and Viehweg over algebraically closed base field as a universal regular quotient of the relative Chow group of 0-cycles by Levine-Weibel. In this paper, we obtain a functorial description of the Albanese of Esnault-Srinivas-Viehweg over a perfect base field, using duality theory of 1-motives with unipotent part.

  18. Perfection of physical preparation of students by facilities of boxing

    Directory of Open Access Journals (Sweden)

    Krylovskiy O.V.

    2010-02-01

    Full Text Available The question of physical preparedness of students of the unspecialized institutes of higher of I-IV of courses is considered. Offered and grounded idea of the use of facilities of boxing in form educational trainings employments. They are used for perfection of physical preparation of students as an alternative to the lessons on physical education. For the students of experimental group more considerable increase of indexes of physical preparedness is marked by comparison to a control group.

  19. Experimental Observation of Kink in a Perfect Bidimensional Granular System

    Institute of Scientific and Technical Information of China (English)

    ZHANG Peng; MIAO Guo-Qing; HUANG Kai; YUN Yi; WEI Rong-Jue

    2005-01-01

    @@ The kink formation in a vertical vibrated granular layer has been widely studied in three-dimensional systems, but there are few if any experimental reports on bidimensional granular layers. We report the kink formation newly found in a perfect bidimensional granular system. We measure the range of the driving frequencies and dimensionless accelerations for kinks. Furthermore, we observe a heaping process, which is caused by co-operative action of the kink-associated convection and the sidewall-associated convection.

  20. Sea voyages of Buddhist monks

    Digital Repository Service at National Institute of Oceanography (India)

    Gaur, A.S.

    stream_size 5 stream_content_type text/plain stream_name Facets_Indian_Civilization_1997_551.pdf.txt stream_source_info Facets_Indian_Civilization_1997_551.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset...

  1. Perfect Matchings via Uniform Sampling in Regular Bipartite Graphs

    CERN Document Server

    Goel, Ashish; Khanna, Sanjeev

    2008-01-01

    In this paper we further investigate the well-studied problem of finding a perfect matching in a regular bipartite graph. The first non-trivial algorithm, with running time $O(mn)$, dates back to K\\"{o}nig's work in 1916 (here $m=nd$ is the number of edges in the graph, $2n$ is the number of vertices, and $d$ is the degree of each node). The currently most efficient algorithm takes time $O(m)$, and is due to Cole, Ost, and Schirra. We improve this running time to $O(\\min\\{m, \\frac{n^{2.5}\\ln n}{d}\\})$; this minimum can never be larger than $O(n^{1.75}\\sqrt{\\ln n})$. We obtain this improvement by proving a uniform sampling theorem: if we sample each edge in a $d$-regular bipartite graph independently with a probability $p = O(\\frac{n\\ln n}{d^2})$ then the resulting graph has a perfect matching with high probability. The proof involves a decomposition of the graph into pieces which are guaranteed to have many perfect matchings but do not have any small cuts. We then establish a correspondence between potential ...

  2. Black hole solutions surrounded by perfect fluid in Rastall theory

    Science.gov (United States)

    Heydarzade, Y.; Darabi, F.

    2017-08-01

    In this work, we obtain uncharged∖charged Kiselev-like black holes as a new class of black hole solutions surrounded by perfect fluid in the context of Rastall theory. Then, we study the specific cases of the uncharged∖charged black holes surrounded by regular matter like dust and radiation, or exotic matter like quintessence, cosmological constant and phantom fields. By comparing the Kiselev-like black hole solutions in Rastall theory with the Kiselev black hole solutions in GR, we find an effective perfect fluid behavior for the black hole's surrounding field. It is shown that the corresponding effective perfect fluid has interesting characteristic features depending on the different ranges of the parameters in Rastall theory. For instance, Kiselev-like black holes surrounded by regular matter in Rastall theory may be considered as Kiselev black holes surrounded by exotic matter in GR, or Kiselev-like black holes surrounded by exotic matter in Rastall theory may be considered as Kiselev black holes surrounded by regular matter in GR.

  3. Thin Perfect Absorbers for Electromagnetic Waves: Theory, Design, and Realizations

    Science.gov (United States)

    Ra'di, Y.; Simovski, C. R.; Tretyakov, S. A.

    2015-03-01

    With recent advances in nanophotonics and nanofabrication, considerable progress has been achieved in realizations of thin composite layers designed for full absorption of incident electromagnetic radiation, from microwaves to the visible. If the layer is structured at a subwavelength scale, thin perfect absorbers are usually called "metamaterial absorbers," because these composite structures are designed to emulate some material responses not reachable with any natural material. On the other hand, many thin absorbing composite layers were designed and used already in the time of the introduction of radar technology, predominantly as a means to reduce radar visibility of targets. In view of a wide variety of classical and new topologies of optically thin metamaterial absorbers and plurality of applications, there is a need for a general, conceptual overview of the fundamental mechanisms of full absorption of light or microwave radiation in thin layers. Here, we present such an overview in the form of a general theory of thin perfectly absorbing layers. Possible topologies of perfect metamaterial absorbers are classified based on their fundamental operational principles. For each of the identified classes, we provide design equations and give examples of particular realizations. The concluding section provides a summary and gives an outlook on future developments in this field.

  4. Extending a perfect matching to a Hamiltonian cycle

    DEFF Research Database (Denmark)

    Alahmadi, Adel; Aldred, Robert E. L.; Alkenani, Ahmad;

    2015-01-01

    In 1993 Ruskey and Savage conjectured that in the d-dimensional hypercube, every matching M can be extended to a Hamiltonian cycle. Fink verified this for every perfect matchingM, remarkably even ifM contains external edges. We prove that this property also holds for sparse spanning regular...... subgraphs of the cubes: for every d ≥ 7 and every k, where 7 ≥ k ≥ d, the d-dimensional hypercube contains a k-regular spanning subgraph such that every perfect matching (possibly with external edges) can be extended to a Hamiltonian cycle. We do not know if this result can be extended to k = 4; 5; 6....... It cannot be extended to k = 3. Indeed, there are only three 3-regular graphs such that every perfect matching (possibly with external edges) can be extended to a Hamiltonian cycle, namely the complete graph on 4 vertices, the complete bipartite 3-regular graph on 6 vertices and the 3-cube on 8 vertices...

  5. Assessment of the Empirical Management Method of Coppice Chestnut (Castanea sativa Mill. Forests Practiced by the Monks and its Effect on the Availability of Forest Soil Resources in Mount Athos, Greece

    Directory of Open Access Journals (Sweden)

    Athanasios PAPAIOANNOU

    2013-05-01

    Full Text Available In Greece, chestnut forests (Castanea sativa Mill. occupy more than 30,000 ha of forest land. The species is one of the most significant of the Balkans. It is mainly cultivated for its high quality wood. Concerning cultivation and harvesting, the monks in Mount Athos peninsula in northern Greece practice a special empirical management method for local coppice chestnut forests. Data collected from 9 sampling surfaces, comprising of coppice chestnut stands of three different ages (10, 20 and 40 years old, were analyzed to study the effect of this particular empirical management method on specific soil parameters. Results indicated that, there is a general trend for increased organic matter and nutrient concentrations in the soil of 10 and 40 years old chestnut stands in comparison to those of 20 years of age. Cultivation treatments cause intense alterations on soil properties, leading to severe degradation of nutrient resources.

  6. Adherent Monks ’ Idea of Pure Land of LingNan in the Early Qing Dynasty and Humanistic Buddhism%清初岭南遗民僧的“净土”理念与人间佛教

    Institute of Scientific and Technical Information of China (English)

    阮红薇

    2015-01-01

    明末清初的岭南,士大夫纷纷逃禅,形成了以天然-澹归一系为核心的遗民僧群体。他们笃行大乘菩萨道慈悲悯人、普救众生的精神,充满着对人间净土世界的期冀。遗民僧的人间净土与菩萨行的结合契合近现代人间佛教运动的思想潮流,将二者联系论述,有助于揭示岭南佛教的历史发展轨迹,促进当代人间佛教的融合。%The scholar-bureaucras of the late Ming and early Qing Dynasty in the region of Lingnan altered their views of value and escaped to Dhyana, which formed a group of adherent monks was with the lineage of Tianran to Dangui at a core. They practiced the spirit devotedly of Mahayana practitioners’ path with mercy, compassion and saving all the living beings, which was full of desire for pure land in humankind world. This method that combined humankind pureland with the bodhisattva’s way of adherent monks went along with the ideological trend of Humanistic Buddhism. Hence, this discussion by contacting the two parts is to revealing the development track of the history of LingnanBuddhism, and advancing their fusion with Humanistic Buddhism.

  7. Limiting absorption principle and perfectly matched layer method for Dirichlet Laplacians in quasi-cylindrical domains

    CERN Document Server

    Kalvin, Victor

    2011-01-01

    We establish a limiting absorption principle for Dirichlet Laplacians in quasi-cylindrical domains. Outside a bounded set these domains can be transformed onto a semi-cylinder by suitable diffeomorphisms. Dirichlet Laplacians model quantum or acoustically-soft waveguides associated with quasi-cylindrical domains. We construct a uniquely solvable problem with perfectly matched layers of finite length. We prove that solutions of the latter problem approximate outgoing or incoming solutions with an error that exponentially tends to zero as the length of layers tends to infinity. Outgoing and incoming solutions are characterized by means of the limiting absorption principle.

  8. OF THE CONCEPT OF QUALITY OF PHYSICAL PERFECTION IN THE CONTEXT OF QUALITY OF LIFE

    Directory of Open Access Journals (Sweden)

    A. S. Khorloohiyn

    2011-01-01

    Full Text Available The urgency of definition of the concept of quality of physical perfection in a context of quality of life is described. Necessity of application to the decision of the given problem of system approaches is shown. The structure of developed model of system of quality management of granting of service as complex of the interconnected systems is defined. Questions of maintenance of a complex of means and methods of an estimation of a condition of the client and definition of a technique of formation of the correct typical program of physical preparation of the client are allocated. 

  9. Reply to Comment on Reply to Comment on `Perfect imaging without negative refraction'

    CERN Document Server

    Leonhardt, Ulf

    2010-01-01

    Kinsler and Favaro point out correctly that Blaikie's numerical solution of Maxwell's equations in Maxwell's fish eye is causal and hence valid, a solution where no perfect image is formed. It is wrong to conclude from the existence of a causal solution with perfect imaging that one without perfect resolution is not causal; both are allowed by causality. However, Maxwell's fish eye can still perfectly image, as the Reply shows.

  10. New aspects of regions whose tilings are enumerated by perfect powers

    OpenAIRE

    Lai, Tri

    2013-01-01

    In 2003, Ciucu presented a unified way to enumerate tilings of lattice regions by using a certain Reduction Theorem (Ciucu, Perfect Matchings and Perfect Powers, Journal of Algebraic Combinatorics, 2003). In this paper we continue this line of work by investigating new families of lattice regions whose tilings are enumerated by perfect powers or products of several perfect powers. We prove a multi-parameter generalization of Bo-Yin Yang's theorem on fortresses (B.-Y. Yang, Ph.D. thesis, Depar...

  11. Influence of temperature on formation of perfect tau fragment fibrils using PRIME20/DMD simulations.

    Science.gov (United States)

    Cheon, Mookyung; Chang, Iksoo; Hall, Carol K

    2012-10-01

    We investigate the fibrillization process for amyloid tau fragment peptides (VQIVYK) by applying the discontinuous molecular dynamics method to a system of 48 VQIVYK peptides modeled using a new protein model/force field, PRIME20. The aim of the article is to ascertain which factors are most important in determining whether or not a peptide system forms perfect coherent fibrillar structures. Two different directional criteria are used to determine when a hydrogen bond occurs: the original H-bond constraints and a parallel preference H-bond constraint that imparts a slight bias towards the formation of parallel versus antiparallel strands in a β-sheet. Under the original H-bond constraints, the resulting fibrillar structures contain a mixture of parallel and antiparallel pairs of strands within each β-sheet over the whole fibrillization temperature range. Under the parallel preference H-bond constraints, the β-sheets within the fibrillar structures are more likely to be parallel and indeed become perfectly parallel, consistent with X-ray crystallography, at a high temperature slightly below the fibrillization temperature. The high temperature environment encourages the formation of perfect fibril structures by providing enough time and space for peptides to rearrange during the aggregation process. There are two different kinetic mechanisms, template assembly with monomer addition at high temperature and merging/rearrangement without monomer addition at low temperature, which lead to significant differences in the final fibrillar structure. This suggests that the diverse fibril morphologies generally observed in vitro depend more on environmental conditions than has heretofore been appreciated. Copyright © 2012 The Protein Society.

  12. Classical and quantum solutions in Brans-Dicke cosmology with a perfect fluid

    Science.gov (United States)

    Paliathanasis, Andronikos; Tsamparlis, Michael; Basilakos, Spyros; Barrow, John D.

    2016-02-01

    We consider the application of group invariant transformations in order to constrain a flat isotropic and homogeneous cosmological model, containing a Brans-Dicke scalar field and a perfect fluid with a constant equation of state parameter w , where the latter is not interacting with the scalar field in the gravitational action integral. The requirement that the Wheeler-DeWitt equation be invariant under one-parameter point transformations provides us with two families of power-law potentials for the Brans-Dicke field, in which the powers are functions of the Brans-Dicke parameter ωBD and the parameter w . The existence of the Lie symmetry in the Wheeler-DeWitt equation is equivalent to the existence of a conserved quantity in field equations and with oscillatory terms in the wave function of the Universe. This enables us to solve the field equations. For a specific value of the conserved quantity, we find a closed-form solution for the Hubble factor, which is equivalent to a cosmological model in general relativity containing two perfect fluids. This provides us with different models for specific values of the parameters ωBD , and w . Finally, the results hold for the specific case where the Brans-Dicke parameter ωBD is zero, that is, for the O'Hanlon massive dilaton theory and, consequently, for f (R ) gravity in the metric formalism.

  13. Digital health revolution: perfect storm or perfect opportunity for pharmaceutical R&D?

    Science.gov (United States)

    Hird, Nick; Ghosh, Samik; Kitano, Hiroaki

    2016-06-01

    The convergence of technology and medicine has pushed healthcare to the brink of a major disruption that pharma has, until recently, been slow to recognize. Tech players have pioneered the emerging field of digital wellness and health, and pharma is ideally placed to use its expertise in drug development and embrace these technologies to create digital applications that address major medical needs. This review describes digital innovation from a pharma R&D perspective, outlining principal drivers, digital components, opportunities and challenges as well as a sustainable new business model predicated on empowered patients and achieving therapeutic outcomes.

  14. Factors of determination values personal‟s self-perfection of future teachers

    OpenAIRE

    Uisimbaieva, Nataliia

    2017-01-01

    The article identifies and justified the major factors of determination values personal’sself-perfection of future teachers; the phenomenon of personal self-perfection of futureteachers is regarded as a socially deterministic process.Key words: values, value system, value orientation, self-perfection, personalimprovement, value determination.

  15. Asymmetric perfectly matched layer for the absorption of waves

    Energy Technology Data Exchange (ETDEWEB)

    Vay, Jean-Luc

    2002-02-10

    The Perfectly Matched Layer (PML) has become a standard for comparison in the techniques that have been developed to close the system of Maxwell equations (more generally wave equations) when simulating an open system. The original Berenger PML formulation relies on a split version of Maxwell equations with numerical electric and magnetic conductivities. They present here an extension of this formulation which introduces counterparts of the electric and magnetic conductivities affecting the term which is spatially differentiated in the equations. they phase velocity along each direction is also multiplied by an additional coefficient. They show that, under certain constraints on the additional numerical coefficients, this ''medium'' does not generate any reflection at any angle and any frequency and is then a Perfectly Matched Layer. Technically it is a super-set of Berenger's PML to which it reduces for a specific set of parameters and like it, it is anisotropic. However, unlike the PML, it introduces some asymmetry in the absorption rate and is therefore labeled an APML for Asymmetric Perfectly Matched Layer. They present here the numerical considerations that have led them to introduce such a medium as well as its theory. Several finite-different numerical implementations are derived (in one, two and three dimensions) and the performance of the APML is contrasted with that of the PML in one and two dimensions. Using plane wave analysis, they show that the APML implementations lead to higher absorption rates than the considered PML implementations. Although they have considered in this paper the finite-different discretization of Maxwell-like equations only, the APML system of equations may be used with other discretization schemes, such as finite-elements, and may be applied to other equations, for applications beyond electromagnetics.

  16. Infrared Perfect Ultra-narrow Band Absorber as Plasmonic Sensor

    OpenAIRE

    Wu, Dong; Liu, Yumin; Li, Ruifang; Chen, Lei; Ma, Rui; Liu, Chang; Ye, Han

    2016-01-01

    We propose and numerically investigate a novel perfect ultra-narrow band absorber based on a metal-dielectric-metal-dielectric-metal periodic structure working at near-infrared region, which consists of a dielectric layer sandwiched by a metallic nanobar array and a thin gold film over a dielectric layer supported by a metallic film. The absorption efficiency and ultra-narrow band of the absorber are about 98 % and 0.5 nm, respectively. The high absorption is contributed to localized surface ...

  17. Arbitrarily thin metamaterial structure for perfect absorption and giant magnification

    DEFF Research Database (Denmark)

    Jin, Yi; Xiao, Sanshui; Mortensen, N. Asger

    2011-01-01

    In our common understanding, for strong absorption or amplification in a slab structure, the desire of reducing the slab thickness seems contradictory to the condition of small loss or gain. In this paper, this common understanding is challenged. It is shown that an arbitrarily thin metamaterial...... layer can perfectly absorb or giantly amplify an incident plane wave at a critical angle when the real parts of the permittivity and permeability of the metamaterial are zero while the absolute imaginary parts can be arbitrarily small. The metamaterial layer needs a totally reflective substrate...

  18. Random Matrix Theory Approach to Chaotic Coherent Perfect Absorbers.

    Science.gov (United States)

    Li, Huanan; Suwunnarat, Suwun; Fleischmann, Ragnar; Schanz, Holger; Kottos, Tsampikos

    2017-01-27

    We employ random matrix theory in order to investigate coherent perfect absorption (CPA) in lossy systems with complex internal dynamics. The loss strength γ_{CPA} and energy E_{CPA}, for which a CPA occurs, are expressed in terms of the eigenmodes of the isolated cavity-thus carrying over the information about the chaotic nature of the target-and their coupling to a finite number of scattering channels. Our results are tested against numerical calculations using complex networks of resonators and chaotic graphs as CPA cavities.

  19. Generating static perfect-fluid solutions of Einstein's equations

    CERN Document Server

    Quevedo, Hernando

    2015-01-01

    We present a method for generating exact interior solutions of Einstein's equations in the case of static and axially symmetric perfect-fluid spacetimes. The method is based upon a transformation that involves the metric functions as well as the density and pressure of the seed solution. In the limiting vacuum case, it reduces to the Zipoy-Voorhees transformation that can be used to generate metrics with multipole moments. All the metric functions of the new solution can be calculated explicitly from the seed solution in a simple manner. The physical properties of the resulting new solutions are shown to be completely different from those of the seed solution.

  20. Generating static perfect-fluid solutions of Einstein's equations

    Science.gov (United States)

    Quevedo, Hernando; Toktarbay, Saken

    2015-05-01

    We present a method for generating exact interior solutions of Einstein's equations in the case of static and axially symmetric perfect-fluid spacetimes. The method is based upon a transformation that involves the metric functions as well as the density and pressure of the seed solution. In the limiting vacuum case, it reduces to the Zipoy-Voorhees transformation that can be used to generate metrics with multipole moments. All the metric functions of the new solution can be calculated explicitly from the seed solution in a simple manner. The physical properties of the resulting new solutions are shown to be completely different from those of the seed solution.

  1. Seeking perfection: a Kantian look at human genetic engineering.

    Science.gov (United States)

    Gunderson, Martin

    2007-01-01

    It is tempting to argue that Kantian moral philosophy justifies prohibiting both human germ-line genetic engineering and non-therapeutic genetic engineering because they fail to respect human dignity. There are, however, good reasons for resisting this temptation. In fact, Kant's moral philosophy provides reasons that support genetic engineering-even germ-line and non-therapeutic. This is true of Kant's imperfect duties to seek one's own perfection and the happiness of others. It is also true of the categorical imperative. Kant's moral philosophy does, however, provide limits to justifiable genetic engineering.

  2. Coherent polarization locking with near-perfect combining efficiency.

    Science.gov (United States)

    Phua, P B; Lim, Yuan Liang

    2006-07-15

    We demonstrate the coherent locking of two orthogonal polarized lasers by using polarization selective loss. The two orthogonal polarizations are locked coherently to produce a resultant polarization state that sees minimal cavity loss. In contrast to the Michelson locking schemes, our scheme has the advantage of easy tunability, which helps to routinely achieve near-perfect (>99%) combining efficiency even when the power of the two arms is highly imbalanced and is varied from a power ratio of unity to >5. We also demonstrate an interesting phenomenon in which a miniscule injection of an antiphase field component from one arm into another can significantly inhibit the locking mechanism.

  3. Calculation of Electromagnetic Scattering by a Perfect Conductor.

    Science.gov (United States)

    1980-06-05

    AD-A091 027 NAVAL SURFACE WEAPONS CENTER SILVER SPRING NO0 F/G 20/3 CALCULATION OF ELECTROMAGNETIC SCATTERING BY A PERFECT CONDUCTO --ETCIU) JUN G0 A...let aO,r nonBr. We have 1E.2 - aHl.2 = V.(H I x E2) BE 1.E 2 _ * H H_ . 21. MUller , C., Foundations of the Mathematical Theory of Electromagnetic...20. Kellogg, R. B., "A Scattering Problem for Maxwell’s Equations," Ibid. 21. MUller , C., Foundations of the Mathematical Theory of Electromagnetic

  4. Non-diffracting speckles of a perfect vortex beam

    Science.gov (United States)

    Gangi Reddy, Salla; P, Chithrabhanu; Vaity, Pravin; Aadhi, A.; Prabhakar, Shashi; Singh, R. P.

    2016-05-01

    We generate perfect optical vortex (POV) beams, whose intensity distribution is independent of the order, and scatter them through a rough surface. We show that the size of produced speckles is independent of the order of the POV and their Fourier transform gives the random non-diffracting fields. The invariant size of speckles over the free space propagation verifies their non-diffracting or non-diverging nature. The size of speckles can be easily controlled by changing the axicon parameter, used to generate the Bessel-Gauss beams whose Fourier transform provides the POV. These results may be useful in applications of POV for authentication in cryptography.

  5. Group analysis of a conformal perfect fluid spacetime

    Science.gov (United States)

    Govinder, K. S.; Hansraj, S.

    2012-04-01

    We find new exact solutions of the Einstein field equations for a perfect fluid metric conformal to a spacetime of type D in the Petrov classification scheme. We analyse the complete system of equations using Lie group analysis. While previous work was confined to conformal factors of the form U = U(t, x), we investigate the complete situation U = U(t, x, y, z) as well as an auxiliary integrability condition. New classes of solutions are generated via the symmetry generators. The resulting solutions are examined for physical plausibility. Expressions for the energy density and pressure are obtained explicitly and empirical results suggest that these dynamical quantities are positive as expected.

  6. Analysis of the Perfect Table Fuzzy Rainbow Tradeoff

    Directory of Open Access Journals (Sweden)

    Byoung-Il Kim

    2014-01-01

    Full Text Available Cryptanalytic time memory tradeoff algorithms are tools for inverting one-way functions, and they are used in practice to recover passwords that restrict access to digital documents. This work provides an accurate complexity analysis of the perfect table fuzzy rainbow tradeoff algorithm. Based on the analysis results, we show that the lesser known fuzzy rainbow tradeoff performs better than the original rainbow tradeoff, which is widely believed to be the best tradeoff algorithm. The fuzzy rainbow tradeoff can attain higher online efficiency than the rainbow tradeoff and do so at a lower precomputation cost.

  7. Probabilistically Perfect Cloning of Two Pure States: Geometric Approach

    Science.gov (United States)

    Yerokhin, V.; Shehu, A.; Feldman, E.; Bagan, E.; Bergou, J. A.

    2016-05-01

    We solve the long-standing problem of making n perfect clones from m copies of one of two known pure states with minimum failure probability in the general case where the known states have arbitrary a priori probabilities. The solution emerges from a geometric formulation of the problem. This formulation reveals that cloning converges to state discrimination followed by state preparation as the number of clones goes to infinity. The convergence exhibits a phenomenon analogous to a second-order symmetry-breaking phase transition.

  8. Classical and quantum dynamics of a perfect fluid scalar-energy dependent metric cosmology

    CERN Document Server

    Khodadi, M; Vakili, B

    2016-01-01

    Inspired from the idea of minimally coupling of a real scalar field to geometry, we investigate the classical and quantum models of a flat energy-dependent FRW cosmology coupled to a perfect fluid in the framework of the scalar-rainbow metric gravity. We use the standard Schutz' representation for the perfect fluid and show that under a particular energy-dependent gauge fixing, it may lead to the identification of a time parameter for the corresponding dynamical system. It is shown that, under some circumstances on the minisuperspace prob energy, the classical evolution of the of the universe represents a late time expansion coming from a bounce instead of the big-bang singularity. Then we go forward by showing that this formalism gives rise to a Schr\\"{o}dinger-Wheeler-DeWitt (SWD) equation for the quantum-mechanical description of the model under consideration, the eigenfunctions of which can be used to construct the wave function of the universe. We use the resulting wave function in order to investigate t...

  9. Classical and quantum dynamics of a perfect fluid scalar-energy dependent metric cosmology

    Science.gov (United States)

    Khodadi, M.; Nozari, K.; Vakili, B.

    2016-05-01

    Inspired from the idea of minimally coupling of a real scalar field to geometry, we investigate the classical and quantum models of a flat energy-dependent FRW cosmology coupled to a perfect fluid in the framework of the scalar-rainbow metric gravity. We use the standard Schutz' representation for the perfect fluid and show that under a particular energy-dependent gauge fixing, it may lead to the identification of a time parameter for the corresponding dynamical system. It is shown that, under some circumstances on the minisuperspace prob energy, the classical evolution of the of the universe represents a late time expansion coming from a bounce instead of the big-bang singularity. Then we go forward by showing that this formalism gives rise to a Schrödinger-Wheeler-DeWitt equation for the quantum-mechanical description of the model under consideration, the eigenfunctions of which can be used to construct the wave function of the universe. We use the resulting wave function in order to investigate the possibility of the avoidance of classical singularities due to quantum effects by means of the many-worlds and Bohmian interpretation of quantum cosmology.

  10. Diffusion of helium in the perfect and non perfect uranium dioxide crystals and their local structures

    Energy Technology Data Exchange (ETDEWEB)

    Dabrowski, Ludwik, E-mail: luddab@hotmail.com; Szuta, Marcin

    2014-12-05

    Highlights: • The nano local structure of UO{sub 2} containing oxygen and uranium vacancies was identified. • We have determined for the first time in the UO{sub 2} the dynamical energy barriers to He migration. • It was found that the migration of helium is along the polylines. • The helium diffusion is accompanied of the emission–absorption of phonons. - Abstract: Local nano structures and their changes relevant with the diffusion of helium was determined by applying the density functional theory (DFT). With its help we calculated deformation of the crystal lattice while wandering helium atoms between octahedral sites. The optimal mutual coordinates of the atoms were determined by minimizing the Hellman–Feyman forces, allowing at the same time precisely specify dynamic height and the shape of the potential barrier. For a crystal containing single oxygen or uranium vacancies, has been described both the deformation associated with the presence of vacancy, as well as additional deformation related to the migration of the helium atom in the lattice. It was found that in the case of vacancies, the migration of helium atoms between the octahedral sites is not along a straight line but along a polyline. In addition, the presence of uranium vacancy causes that helium atoms in the octahedral sites, situated in the I and II coordination shell of uranium vacancy, have different energies. Migration between such positions must be carried out with the participation of the emission–absorption of phonons. Applying two site – model we evaluated the time for an over-barrier jump and diffusion of interstitial He. The obtained values for diffusion coefficient are compared with the experimentally obtained values and with the theoretical values of other authors.

  11. Free-space optical communication link using perfect vortex beams carrying orbital angular momentum (OAM)

    Science.gov (United States)

    Zhu, Fuquan; Huang, Sujuan; Shao, Wei; Zhang, Jie; Chen, Musheng; Zhang, Weibing; Zeng, Junzhang

    2017-08-01

    We experimentally demonstrate a free-space optical communication link using perfect vortex beams. Perfect vortex beams with different topological charges are generated using a phase-modulation-type spatial light modulator (SLM) loaded with novel phase holograms based on the Bessel function. With the help of a microscope objective and simple lens, perfect vortex beams are transmitted effectively for a certain distance. After completing the demodulation of perfect vortex beams carrying OFDM 16-QAM signals and a series of offline processing on the Gaussian bright spot demodulated from the perfect vortex beams, we also achieve a communication link. The constellations and mean bit error rates (BER) of subcarriers are shown.

  12. Coordinate transformations make perfect invisibility cloaks with arbitrary shape

    Energy Technology Data Exchange (ETDEWEB)

    Yan Wei; Yan Min; Ruan Zhichao; Qiu Min [Laboratory of Optics, Photonics and Quantum Electronics, Department of Microelectronics and Applied Physics, Royal Institute of Technology, 164 40 Kista (Sweden)], E-mail: min@kth.se

    2008-04-15

    By investigating wave properties at cloak boundaries, invisibility cloaks with arbitrary shape constructed by general coordinate transformations are confirmed to be perfectly invisible to the external incident wave. The differences between line transformed cloaks and point transformed cloaks are discussed. The fields in the cloak medium are found analytically to be related to the fields in the original space via coordinate transformation functions. At the exterior boundary of the cloak, it is shown that no reflection is excited even though the permittivity and permeability do not always have a perfectly matched layer form, whereas at the inner boundary, no reflection is excited either, and in particular no field can penetrate into the cloaked region. However, for the inner boundary of any line transformed cloak, the permittivity and permeability in a specific tangential direction are always required to be infinitely large. Furthermore, the field discontinuity at the inner boundary always exists; the surface current is induced to make this discontinuity self-consistent. A point transformed cloak does not experience such problems. The tangential fields at the inner boundary are all zero, implying that no field discontinuity exists.

  13. Superhydrophobicity in perfection: the outstanding properties of the lotus leaf

    Directory of Open Access Journals (Sweden)

    Hans J. Ensikat

    2011-03-01

    Full Text Available Lotus leaves have become an icon for superhydrophobicity and self-cleaning surfaces, and have led to the concept of the ‘Lotus effect’. Although many other plants have superhydrophobic surfaces with almost similar contact angles, the lotus shows better stability and perfection of its water repellency. Here, we compare the relevant properties such as the micro- and nano-structure, the chemical composition of the waxes and the mechanical properties of lotus with its competitors. It soon becomes obvious that the upper epidermis of the lotus leaf has developed some unrivaled optimizations. The extraordinary shape and the density of the papillae are the basis for the extremely reduced contact area between surface and water drops. The exceptional dense layer of very small epicuticular wax tubules is a result of their unique chemical composition. The mechanical robustness of the papillae and the wax tubules reduce damage and are the basis for the perfection and durability of the water repellency. A reason for the optimization, particularly of the upper side of the lotus leaf, can be deduced from the fact that the stomata are located in the upper epidermis. Here, the impact of rain and contamination is higher than on the lower epidermis. The lotus plant has successfully developed an excellent protection for this delicate epistomatic surface of its leaves.

  14. Can Maxwell's fish eye lens really give perfect imaging?

    CERN Document Server

    Sun, Fei

    2010-01-01

    Both explicit analysis and FEM numerical simulation are used to analyze the field distribution of a line current in the so-called Maxwell's fish eye lens [bounded with a perfectly electrical conductor (PEC) boundary]. We show that such a 2D Maxwell's fish eye lens cannot give perfect imaging due to the fact that high order modes of the object field can hardly reach the image point in Maxwell's fish eye lens. If only zeroth order mode is excited, a good image of a sharp object may be achieved in some cases, however, its spot-size is larger than the spot size of the initial object field. The image resolution is determined by the field spot size of the image corresponding to the zeroth order component of the object field. Our explicit analysis consists very well with the FEM results for a fish eye lens. Time-domain simulation is also given to verify our conclusion. Multi-point images for a single object point are also demonstrated.

  15. Interference control of perfect photon absorption in cavity quantum electrodynamics

    CERN Document Server

    Wang, Liyong; Zhu, Yifu; Agarwal, G S

    2016-01-01

    We propose and analyze a scheme for controlling coherent photon transmission and reflection in a cavity-quantum-electrodynamics (CQED) system consisting of an optical resonator coupled with three-level atoms coherently prepared by a control laser from free space. When the control laser is off and the cavity is excited by two identical light fields from two ends of the cavity, the two input light fields can be completely absorbed by the CQED system and the light energy is converted into the excitation of the polariton states, but no light can escape from the cavity. Two distinct cases of controlling the perfect photon absorption are analyzed: (a) when the control laser is tuned to the atomic resonance and creates electromagnetically induced transparency, the prefect photon absorption is suppressed and the input light fields are nearly completely transmitted through the cavity; (b) when the control laser is tuned to the polariton state resonance and inhibits the polariton state excitation, the perfect photon ab...

  16. Bit-Interleaved Coded Multiple Beamforming with Perfect Coding

    CERN Document Server

    Li, Boyu

    2010-01-01

    When the channel state information is known by the transmitter as well as the receiver, beamforming techniques that employ Singular Value Decomposition (SVD) are commonly used in Multiple-Input Multiple-Output (MIMO) systems. Without channel coding, when a single symbol is transmitted, these systems achieve the full diversity order. Whereas, this property is lost when multiple symbols are simultaneously transmitted. Full diversity can be restored when channel coding is added, as long as the code rate Rc and the number of employed subchannels S satisfy the condition RcS =< 1. Moreover, by adding a proper constellation precoder, full diversity can be achieved for both uncoded and coded SVD systems, e.g., Fully Precoded Multiple Beamforming (FPMB) and Bit-Interleaved Coded Multiple Beamforming with Full Precoding (BICMB-FP). Perfect Space-Time Block Code (PSTBC) is a full-rate full-diversity space-time code, which achieves maximum coding gain for MIMO systems. Previously, Perfect Coded Multiple Beamforming (P...

  17. Optimal control for perfect state transfer in linear quantum memory

    Science.gov (United States)

    Nakao, Hideaki; Yamamoto, Naoki

    2017-03-01

    A quantum memory is a system that enables transfer, storage, and retrieval of optical quantum states by ON/OFF switching of the control signal in each stage of the memory. In particular, it is known that, for perfect transfer of a single-photon state, appropriate shaping of the input pulse is required. However, in general, such a desirable pulse shape has a complicated form, which would be hard to generate in practice. In this paper, for a wide class of linear quantum memory systems, we develop a method that reduces the complexity of the input pulse shape of a single photon while maintaining the perfect state transfer. The key idea is twofold; (i) the control signal is allowed to vary continuously in time to introduce an additional degree of freedom, and then (ii) an optimal control problem is formulated to design a simple-formed input pulse and the corresponding control signal. Numerical simulations are conducted for Λ-type atomic media and networked atomic ensembles, to show the effectiveness of the proposed method.

  18. Superhydrophobicity in perfection: the outstanding properties of the lotus leaf.

    Science.gov (United States)

    Ensikat, Hans J; Ditsche-Kuru, Petra; Neinhuis, Christoph; Barthlott, Wilhelm

    2011-01-01

    Lotus leaves have become an icon for superhydrophobicity and self-cleaning surfaces, and have led to the concept of the 'Lotus effect'. Although many other plants have superhydrophobic surfaces with almost similar contact angles, the lotus shows better stability and perfection of its water repellency. Here, we compare the relevant properties such as the micro- and nano-structure, the chemical composition of the waxes and the mechanical properties of lotus with its competitors. It soon becomes obvious that the upper epidermis of the lotus leaf has developed some unrivaled optimizations. The extraordinary shape and the density of the papillae are the basis for the extremely reduced contact area between surface and water drops. The exceptional dense layer of very small epicuticular wax tubules is a result of their unique chemical composition. The mechanical robustness of the papillae and the wax tubules reduce damage and are the basis for the perfection and durability of the water repellency. A reason for the optimization, particularly of the upper side of the lotus leaf, can be deduced from the fact that the stomata are located in the upper epidermis. Here, the impact of rain and contamination is higher than on the lower epidermis. The lotus plant has successfully developed an excellent protection for this delicate epistomatic surface of its leaves.

  19. Perfect harmony: A mathematical analysis of four historical tunings

    Science.gov (United States)

    Page, Michael F.

    2004-10-01

    In Western music, a musical interval defined by the frequency ratio of two notes is generally considered consonant when the ratio is composed of small integers. Perfect harmony or an ``ideal just scale,'' which has no exact solution, would require the division of an octave into 12 notes, each of which would be used to create six other consonant intervals. The purpose of this study is to analyze four well-known historical tunings to evaluate how well each one approximates perfect harmony. The analysis consists of a general evaluation in which all consonant intervals are given equal weighting and a specific evaluation for three preludes from Bach's ``Well-Tempered Clavier,'' for which intervals are weighted in proportion to the duration of their occurrence. The four tunings, 5-limit just intonation, quarter-comma meantone temperament, well temperament (Werckmeister III), and equal temperament, are evaluated by measures of centrality, dispersion, distance, and dissonance. When all keys and consonant intervals are equally weighted, equal temperament demonstrates the strongest performance across a variety of measures, although it is not always the best tuning. Given C as the starting note for each tuning, equal temperament and well temperament perform strongly for the three ``Well-Tempered Clavier'' preludes examined. .

  20. Kernels by Monochromatic Paths and Color-Perfect Digraphs

    Directory of Open Access Journals (Sweden)

    Galeana-Śanchez Hortensia

    2016-05-01

    Full Text Available For a digraph D, V (D and A(D will denote the sets of vertices and arcs of D respectively. In an arc-colored digraph, a subset K of V(D is said to be kernel by monochromatic paths (mp-kernel if (1 for any two different vertices x, y in N there is no monochromatic directed path between them (N is mp-independent and (2 for each vertex u in V (D \\ N there exists v ∈ N such that there is a monochromatic directed path from u to v in D (N is mp-absorbent. If every arc in D has a different color, then a kernel by monochromatic paths is said to be a kernel. Two associated digraphs to an arc-colored digraph are the closure and the color-class digraph CC(D. In this paper we will approach an mp-kernel via the closure of induced subdigraphs of D which have the property of having few colors in their arcs with respect to D. We will introduce the concept of color-perfect digraph and we are going to prove that if D is an arc-colored digraph such that D is a quasi color-perfect digraph and CC(D is not strong, then D has an mp-kernel. Previous interesting results are generalized, as for example Richardson′s Theorem.

  1. Characterization of circulant graphs having perfect state transfer

    CERN Document Server

    Bašić, Milan

    2011-01-01

    In this paper we answer the question of when circulant quantum spin networks with nearest-neighbor couplings can give perfect state transfer. The network is described by a circulant graph $G$, which is characterized by its circulant adjacency matrix $A$. Formally, we say that there exists a {\\it perfect state transfer} (PST) between vertices $a,b\\in V(G)$ if $|F(\\tau)_{ab}|=1$, for some positive real number $\\tau$, where $F(t)=\\exp(\\i At)$. Saxena, Severini and Shparlinski ({\\it International Journal of Quantum Information} 5 (2007), 417--430) proved that $|F(\\tau)_{aa}|=1$ for some $a\\in V(G)$ and $\\tau\\in \\R^+$ if and only if all eigenvalues of $G$ are integer (that is, the graph is integral). The integral circulant graph $\\ICG_n (D)$ has the vertex set $Z_n = \\{0, 1, 2, ..., n - 1\\}$ and vertices $a$ and $b$ are adjacent if $\\gcd(a-b,n)\\in D$, where $D \\subseteq \\{d : d \\mid n,\\ 1\\leq d

  2. Op zoek naar de perfecte match in vrijwilligersland

    Directory of Open Access Journals (Sweden)

    Els van Gilst

    2015-06-01

    -to-face contact with a prospective volunteer. Specific attention to motives in interview protocols is important. The use of tests or even the development of alternative tests should also be (reconsidered. In the case of online brokerage, it is much harder to establish an accurate picture of motives. Online testing could offer a solution. However, interpretation possibilities are limited because test results cannot be supplemented with other information. This favours (for the time being face-to-face contact during online Matching.In addition, the phase model of volunteer brokerage provides volunteer centres with a framework to describe their brokerage activities. This can be useful when training (new employees and providing transparency for customers and funders.Op zoek naar de perfecte match in vrijwilligerslandDe vraag naar vrijwilligers neemt de laatste jaren sterk toe in Nederland. Dit heeft te maken met een strengere wet- en regelgeving, veranderende inzet van vrijwilligers en hervormingen in de zorg (Bekkers & Boezeman, 2009; Devilee, 2005; MOVISIE, 2014; Rutte & Samsom, 2012. Steunpunten vrijwilligerswerk kunnen als bemiddelaars bijdragen aan de regulering van de vraag naar vrijwilligers. De mate van succes van vrijwilligersbemiddeling is echter nog relatief beperkt. Uit literatuuronderzoek (Van Gilst et al., 2011 is bekend welke factoren bijdragen aan het succes van vrijwilligersbemiddeling. Dit artikel beschrijft de bemiddelingspraktijk van steunpunten vrijwilligerswerk en geeft aan wanneer en hoe de gevonden succesfactoren kunnen worden ingezet in deze bemiddelingspraktijk om het resultaat te verbeteren. De praktijkgegevens zijn afkomstig van een veldonderzoek onder steunpunten, vrijwilligers en organisaties die met vrijwilligers werken.

  3. Magnetic-flux-driven topological quantum phase transition and manipulation of perfect edge states in graphene tube

    Science.gov (United States)

    Lin, S.; Zhang, G.; Li, C.; Song, Z.

    2016-08-01

    We study the tight-binding model for a graphene tube with perimeter N threaded by a magnetic field. We show exactly that this model has different nontrivial topological phases as the flux changes. The winding number, as an indicator of topological quantum phase transition (QPT) fixes at N/3 if N/3 equals to its integer part [N/3], otherwise it jumps between [N/3] and [N/3] + 1 periodically as the flux varies a flux quantum. For an open tube with zigzag boundary condition, exact edge states are obtained. There exist two perfect midgap edge states, in which the particle is completely located at the boundary, even for a tube with finite length. The threading flux can be employed to control the quantum states: transferring the perfect edge state from one end to the other, or generating maximal entanglement between them.

  4. On a family of well behaved perfect fluid balls as astrophysical objects in general relativity

    Science.gov (United States)

    Maurya, S. K.; Gupta, Y. K.

    2011-07-01

    A family of well behaved perfect fluid balls has been derived starting with the metric potential g 44= B(1+ Cr 2) n for all positive integral values of n. For n≥4, the members of this family are seen to satisfy the various physical conditions e.g. c 2 ρ≥ p≥0, dp/ dr1. Also the pressure, energy density, velocity of sound and ratio of pressure and energy density are of monotonically decreasing towards the pressure free interface ( r= a). The fluid balls join smoothly with the Schwarzschild exterior model at r= a. The well behaved perfect fluid balls so obtained are utilised to construct the superdense star models with their surface density 2×1014 gm/cm3. We have found that the maximum mass of the fluid balls corresponding to various values of n are decreasing with the increasing values of n. Over all maximum mass for the whole family turns out to be 4.1848 M Θ and the corresponding radius as 19.4144 km while the red shift at the centre and red shift at surface as Z 0=1.6459 and Z a =0.6538 respectively this all happens for n=4. It is interesting to note that for higher values of n viz n≥170, the physical data start merging with that of Kuchowicz superdense star models and hence the family of fluid models tends to the Kuchowicz fluid models as n→∞. Consequently the maximum mass of the family of solution can not be less than 1.6096 M Θ which is the maximum mass occupied by the Kuchowicz superdense ball. Hence each member of the family for n≥4 provides the astrophysical objects like White dwarfs, Quark star, typical neutron star.

  5. Non-perfect-fluid space-times in thermodynamic equilibrium and generalized Friedmann equations

    CERN Document Server

    Schatz, Konrad; Chrobok, Thoralf

    2014-01-01

    Assuming homogeneous and parallax-free space-times, in the case of thermodynamic equilibrium, we construct the energy-momentum tensor of non-perfect fluids. To this end we derive the constitutive equations for energy density, isotropic and anisotropic pressure as well as heat-flux from the respective propagation equations. This provides these quantities in closed form, i. e. in terms of the structure constants of the three-dimensional isometry group of homogeneity and, respectively, of the kinematical quantities expansion, rotation and acceleration. Using Einstein's equations, the thereby occurring constants of integration can be determined such that one gets bounds on the kinematical quantities and finds a generalized form of the Friedmann equations. As a consequence, it is shown that, e. g., for a perfect fluid the Friedmann and G\\"odel models can be recovered. All this is derived without assuming any equations of state or other specific thermodynamic conditions, and, in principle, allows one to go beyond t...

  6. The cost of perfection with apparent ease: Theoretical foundations and development of the Effortless Perfectionism Scale.

    Science.gov (United States)

    Travers, Lea V; Randall, Edin T; Bryant, Fred B; Conley, Colleen S; Bohnert, Amy M

    2015-12-01

    Effortless perfection is a term used to describe an intense pressure to be perfect without visible effort (Yee, 2003), and is thought to be linked to several indicators of maladjustment among college-age youth (Ruane, 2012; Yee, 2003). Although effortless perfectionism (EP) is a phenomenon referenced in popular culture, empirical support for this construct is needed. In addition to conceptualizing and discussing the theoretical underpinnings of EP, this paper describes the development of an instrument to assess EP: the 10-item Effortless Perfectionism scale (EPS). The responses of a large sample of students from a Midwestern university (N = 1,270) were used to develop a 1-factor measurement model for the EPS. The EPS showed good internal consistency and test-retest reliability, and demonstrated convergent, discriminant, and incremental validity in relation to other perfectionism scales, as a predictor of psychosocial adjustment, and as a mediator of the effects of gender on adjustment. The present study supports the reliability and construct validity of the EPS as a self-report measure of EP, a distinct type of perfectionism that warrants future investigation.

  7. Thermally Induced Nonlinear Optical Absorption in Metamaterial Perfect Absorbers

    CERN Document Server

    Guddala, Sriram; Ramakrishna, S Anantha

    2015-01-01

    A metamaterial perfect absorber consisting of a tri-layer (Al/ZnS/Al) metal-dielectric-metal system with top aluminium nano-disks is fabricated by laser-interference lithography and lift-off processing. The metamaterial absorber had peak resonant absorbance at 1090 nm and showed nonlinear absorption for 600ps laser pulses at 1064 nm wavelength. A nonlinear saturation of reflectance was measured to be dependent on the average laser power incident and not the peak laser intensity. The nonlinear behaviour is shown to arise from the heating due to the absorbed radiation and photo-thermal changes in the dielectric properties of aluminium. The metamaterial absorber is seen to be damage resistant at large laser intensities of 25 MW/cm2.

  8. Sweeping Preconditioner for the Helmholtz Equation: Artificial Perfectly Matched Layers

    CERN Document Server

    Engquist, Björn

    2010-01-01

    This paper introduces a new sweeping preconditioner for the iterative solution of the variable coefficient Helmholtz equation in two and three dimensions. The algorithms follow the general structure of constructing an approximate $LDL^t$ factorization by eliminating the unknowns layer by layer starting from an absorbing layer. The central idea of this paper is to approximate the Schur complement matrices of the factorization using artificial perfectly matched layers (PMLs) introduced in the interior of the domain. Applying each Schur complement matrix is equivalent to solving a quasi-1D problem with a banded LU factorization in the 2D case and to solving a quasi-2D problem with a multifrontal method in the 3D case. The resulting preconditioner has linear application cost and the preconditioned iterative solver converges in a number of iterations that scales at most logarithmically with the number of unknowns. Numerical results are presented in both two and three dimensions to demonstrate the efficiency of thi...

  9. Acoustic Coherent Perfect Absorbers as Sensitive Null Detectors

    CERN Document Server

    Meng, Chong; Tang, Suet To; Yang, Min; Yang, Zhiyu

    2016-01-01

    We report the experimental realization of acoustic coherent perfect absorption (CPA) of four symmetric scatterers of very different structures. The only conditions necessary for these scatterers to exhibit CPA are that both the reflection and transmission amplitudes of the scatterers are 0.5 under one incident wave, and there are two collinear and counter-propagating incident waves with appropriate relative amplitude and phase. Nearly 1000 times in the modulation of output power has been demonstrated by changing the relative phase of the incident waves over 180{\\deg}. We further demonstrate that these scatterers are sensitive devices to detect the small differences between two nearly equal incident waves. A 27 % change in the strength of the scattering wave has been demonstrated for every degree of phase deviation from the optimum condition between the incident waves.

  10. Using a quantum dot system to realize perfect state transfer

    Institute of Scientific and Technical Information of China (English)

    Li Ji; Wu Shi-Hai; Zhang Wen-Wen; Xi Xiao-Qiang

    2011-01-01

    There are some disadvantages to Nikolopoulos et al.'s protocol [Nikolopoulos G M,Petrosyan D and Lambropoulos P 2004 Europhys.Lett.65 297] where a quantum dot system is used to realize quantum communication.To overcome these disadvantages,we propose a protocol that uses a quantum dot array to construct a four-qubit spin chain to realize perfect quantum state transfer (PQST).First,we calculate the interaction relation for PQST in the spin chain.Second,we review the interaction between the quantum dots in the Heitler-London approach.Third,we present a detailed program for designing the proper parameters of a quantum dot array to realize PQST.

  11. Closed time like curves enable perfect state distinguishability

    Energy Technology Data Exchange (ETDEWEB)

    Harrington, James William [Los Alamos National Laboratory; Wilde, Mark M [USC; Brun, Todd A [USC

    2008-01-01

    The causal self-consistency condition for closed timelike curves can give rise to nonlinear interactions on chronology-respecting qubits. We demonstrate that particular unitary interactions between closed timelike curve qubits and chronology-respecting qubits allow perfect distinguishability of nonorthogonal states, and provide a constructive proof for an arbitrary number of nonorthogonal states. This has a number of highly significant consequences. For example, an adversary with access to closed timelike curves can break the B92, BB84, and SARG04 quantum key distribution protocols, or any prepare-and-measure quantum key distribution scheme. Our result also implies that a party with access to closed timelike curves can violate the Holevo bound by accessing more than log(N) bits of information from an N-dimensional quantum state. In principle, he can transmit an arbitrarily large amount of classical information with a quantum system of fixed size. We discuss the implications of this for quantum cloning.

  12. No-signaling, perfect bipartite dichotomic correlations and local randomness

    CERN Document Server

    Seevinck, M P

    2011-01-01

    The no-signaling constraint on bi-partite correlations is reviewed. It is shown that in order to obtain non-trivial Bell-type inequalities that discern no-signaling correlations from more general ones, one must go beyond considering expectation values of products of observables only. A new set of nontrivial no-signaling inequalities is derived which have a remarkably close resemblance to the CHSH inequality, yet are fundamentally different. A set of inequalities by Roy and Singh and Avis et al., which is claimed to be useful for discerning no-signaling correlations, is shown to be trivially satisfied by any correlation whatsoever. Finally, using the set of newly derived no-signaling inequalities a result with potential cryptographic consequences is proven: if different parties use identical devices, then, once they have perfect correlations at spacelike separation between dichotomic observables, they know that because of no-signaling the local marginals cannot but be completely random.

  13. Assessing Measures of Order Flow Toxicity via Perfect Trade Classification

    DEFF Research Database (Denmark)

    Andersen, Torben G.; Bondarenko, Oleg

    . The VPIN metric involves decomposing volume into active buys and sells. We use the best-bid-offer (BBO) files from the CME Group to construct (near) perfect trade classification measures for the E-mini S&P 500 futures contract. We investigate the accuracy of the ELO Bulk Volume Classification (BVC) scheme...... and find it inferior to a standard tick rule based on individual transactions. Moreover, when VPIN is constructed from accurate classification, it behaves in a diametrically opposite way to BVC-VPIN. We also find the latter to have forecast power for short-term volatility solely because it generates...... systematic classification errors that are correlated with trading volume and return volatility. When controlling for trading intensity and volatility, the BVC-VPIN measure has no incremental predictive power for future volatility. We conclude that VPIN is not suitable for measuring order flow imbalances....

  14. Linear Phase Perfect Reconstruction Filters and Wavelets with Even Symmetry

    CERN Document Server

    Monzon, Lucas

    2011-01-01

    Perfect reconstruction filter banks can be used to generate a variety of wavelet bases. Using IIR linear phase filters one can obtain symmetry properties for the wavelet and scaling functions. In this paper we describe all possible IIR linear phase filters generating symmetric wavelets with any prescribed number of vanishing moments. In analogy with the well known FIR case, we construct and study a new family of wavelets obtained by considering maximal number of vanishing moments for each fixed order of the IIR filter. Explicit expressions for the coefficients of numerator, denominator, zeroes, and poles are presented. This new parameterization allows one to design linear phase quadrature mirror filters with many other properties of interest such as filters that have any preassigned set of zeroes in the stopband or that satisfy an almost interpolating property. Using Beylkin's approach, it is indicated how to implement these IIR filters not as recursive filters but as FIR filters.

  15. Growth, crystalline perfection and characterization of benzophenone oxime crystal

    Science.gov (United States)

    Rajasekar, M.; Muthu, K.; Meenatchi, V.; Bhagavannarayana, G.; Mahadevan, C. K.; Meenakshisundaram, SP.

    Single crystals of benzophenone oxime (BPO) have been grown by slow evaporation solution growth technique from ethanol at room temperature. The single crystal X-ray diffraction study reveals that the crystal belongs to monoclinic system and cell parameters are, a = 9.459 Å, b = 8.383 Å, c = 26.690 Å, v = 2115 Å3 and β = 92.807°. The structure and the crystallinity of the materials were further confirmed by powder X-ray diffraction analysis. The various functional groups present in the molecule are confirmed by FT-IR analysis. The TG/DSC studies reveal the purity of the material and the crystals are transparent in the entire visible region having a lower optical cut-off at ˜300 nm. The crystalline perfection was evaluated by high-resolution X-ray diffraction (HRXRD). The crystal is further characterized by Kurtz powder technique, dielectric studies and microhardness analysis.

  16. Gravitational perfect fluid collapse in Gauss-Bonnet gravity

    Science.gov (United States)

    Abbas, G.; Tahir, M.

    2017-08-01

    The Einstein Gauss-Bonnet theory of gravity is the low-energy limit of heterotic super-symmetric string theory. This paper deals with gravitational collapse of a perfect fluid in Einstein-Gauss-Bonnet gravity by considering the Lemaitre-Tolman-Bondi metric. For this purpose, the closed form of the exact solution of the equations of motion has been determined by using the conservation of the stress-energy tensor and the condition of marginally bound shells. It has been investigated that the presence of a Gauss-Bonnet coupling term α >0 and the pressure of the fluid modifies the structure and time formation of singularity. In this analysis a singularity forms earlier than a horizon, so the end state of the collapse is a naked singularity depending on the initial data. But this singularity is weak and timelike, which goes against the investigation of general relativity.

  17. Perfecting engineering and technical drawing reducing errors and misinterpretations

    CERN Document Server

    Hanifan, Ron

    2015-01-01

    This concise reference helps readers avoid the most commonplace errors in generating or interpreting engineering drawings. Applicable across multiple disciplines, Hanifan’s lucid treatment of such essential skills as understanding and conveying data in a drawing, exacting precision in dimension and tolerance notations, and selecting the most-appropriate drawing type for a particular engineering situation, “Perfecting Engineering and Technical Drawing” is an valuable resource for practicing engineers, engineering technologists, and students. Provides straightforward explanation of the requirements for all common engineering drawing types Maximizes reader understanding of engineering drawing requirements, differentiating the types of drawings and their particular characteristics Elucidates electrical reference designation requirements, geometric dimensioning, and tolerancing errors Explains the entire engineering documentation process from concept to delivery

  18. Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    CERN Document Server

    Stuchlík, Zdeněk; Schee, Jan; Kučáková, Hana

    2014-01-01

    We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularity representing spherically symmetric vacuum solution of the modified Ho\\v{r}ava quantum gravity that is characterized by a dimensionless parameter $\\omega M^2$, combining the gravitational mass parameter $M$ of the spacetime with the Ho\\v{r}ava parameter $\\omega$ reflecting the role of the quantum corrections. In dependence on the value of $\\omega M^2$, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures. In all of the K-S naked singularity spacetimes the tori are located above an "antigravity" sphere where matter can stay in stable equilibrium position, that is relevant for the stability of the orbiting fluid toroidal accretion structures.

  19. Classical Casimir interaction of a perfectly conducting sphere and plate

    Science.gov (United States)

    Bimonte, Giuseppe

    2017-03-01

    We study the Casimir interaction between a perfectly conducting sphere and plate in the classical limit of high temperatures. By taking the small-distance expansion of the exact scattering formula, we compute the leading correction to the Casimir energy beyond the commonly employed proximity force approximation. We find that for a sphere of radius R at a distance d from the plate the correction is of the form ln2(d /R ), in agreement with indications from recent large-scale numerical computations. We develop a fast-converging numerical scheme for computing the Casimir interaction to high precision, based on bispherical partial waves, and we verify that the short-distance formula provides precise values of the Casimir energy also for fairly large distances.

  20. Perfect synchronization of chaotic systems: a controllability perspective

    Institute of Scientific and Technical Information of China (English)

    Sun Ming-Xuan; He Xiong-Xiong; Yu Li

    2006-01-01

    This paper presents a synchronization method, motivated from the constructive controllability analysis, for two identical chaotic systems. This technique is applied to achieve perfect synchronization for Lorenz systems and coupled dynamo systems. It turns out that states of the drive system and the response system are synchronized within finite time, and the reaching time is independent of initial conditions, which can be specified in advance. In addition to the simultaneous synchronization, the response system is synchronized un-simultaneously to the drive system with different reaching time for each state. The performance of the resulting system is analytically quantified in the face of initial condition error, and with numerical experiments the proposed method is demonstrated to perform well.

  1. Perfect Match: Biometrics and Body Patterning in a Networked World

    Directory of Open Access Journals (Sweden)

    Gillian Fuller

    2003-01-01

    Full Text Available Bodies are increasingly becoming collectively integrated into informational processes which are open to biotechnical forms of regulation. Biometrics, the use of body measurements such as retina scanning, face recognition and fingerprinting is now being uncontroversially introduced throughout the world under the aegis of security and efficient traffic management. Fields that once molded the individual through bodily confinement and observation are dispersing and converging into the regimes of logistics and control. This paper looks at the operations of biometrics to consider the biopolitical ramifications of body measurement as power is made operational by controlling movement via the haptic techniques of information architecture rather than the more familiar modes of discipline and panoptical vision machines. Biometrics is the perfect control for the networked individual as we divide across infinite planes and dimensions, reconfiguring endlessly to become pattern matches in expanding databases of everyday life.

  2. Ordering Trees with Nearly Perfect Matchings by Algebraic Connectivity

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Let T2k+1 be the set of trees on 2k + 1 vertices with nearly perfect matchings and α(T) be the algebraic connectivity of a tree T. The authors determine the largest twelve values of the algebraic connectivity of the trees in T2k+1. Specifically, 10 trees shown in this paper that for each tree T′1, T″1 ∈ T(1) and T′12, T″12 ∈ T(12) and each i, j with 2 ≤ i < j ≤ 11, α(T′1) = α(T″1) >α(Ti) >α(Tj) >α(T′12) = α(T″12). It is also shown

  3. Perfect coupling of light to surface plasmons by coherent absorption

    CERN Document Server

    Noh, Heeso; Stone, A Douglas; Cao, Hui

    2011-01-01

    We show theoretically that coherent light can be completely absorbed in a two-dimensional or three-dimensional metallic nanostructure by matching the frequency and field pattern of an incident wave to that of a localized surface plasmon resonance. This can be regarded as critical coupling to a nano-plasmonic cavity, or as an extension of the concept of time-reversed laser to the spaser. Light scattering is completely suppressed via impedance matching to the nano-objects, and the energy of incoming wave is fully transferred to surface plasmon oscillations and evanescent electromagnetic fields. Perfect coupling of light to nanostructures has potential applications to nanoscale probing as well as background-free spectroscopy and ultrasensitive detection of environmental changes.

  4. Perfection of the special preparation of volleyball players

    Directory of Open Access Journals (Sweden)

    Volodymyr Bogush

    2015-06-01

    Full Text Available Purpose: to develop and apply the complex of exercises for perfection of the special physical preparation of volleyball players and its constituents: special quickness, force, endurance. Material and Methods: sportsmen (candidates in sport masters, I and II digits inspected in age from 16 to 23 in an amount 40 persons; the special quickness and its constituents are probed: latent period of the reaction, the speed of individual movements; maximum force in various modes; endurance – speed, hopping, power. Results: at drawing on the offered complex of exercises the improvement of indexes of speed and endurance hopping, speed-power capabilities is marked at stimulation of tension of muscles in the conditions of development of a maximum of dynamic effort. Conclusions: terms and methods are certain for the effective conducting of training process, which provides optimum intercommunication of levels of bodily and functional conditions, technical and tactical preparation.

  5. Perfect spin filtering effect in ultrasmall helical zigzag graphene nanoribbons

    Science.gov (United States)

    Zhang, Zi-Yue

    2017-02-01

    The spin-polarized transport properties of helical zigzag graphene nanoribbons (ZGNRs) are investigated by first-principles calculations. It is found that although all helical ZGNRs have similar density of states and edge states, they show obviously different transport characteristics depending on the curling manners. ZGNRs curled along zigzag orientation exhibit perfect spin filtering effect with a large spin-split gap near the Fermi level, while ZGNRs curled along armchair orientation behave as conventional conductors for both two spin channels. The spin filtering effect will be weakened with the increase of either ribbon width or curling diameter. The results suggest that ultrasmall helical ZGNRs have important potential applications in spintronics and flexible electronics.

  6. Multilayer metamaterial absorbers inspired by perfectly matched layers

    CERN Document Server

    Pastuszczak, Anna; Antosiewicz, Tomasz J; Kotynski, Rafal

    2014-01-01

    We derive periodic multilayer absorbers with effective uniaxial properties similar to perfectly matched layers (PML). This approximate representation of PML is based on the effective medium theory and we call it an effective medium PML (EM-PML). We compare the spatial reflection spectrum of the layered absorbers to that of a PML material and demonstrate that after neglecting gain and magnetic properties, the absorber remains functional. This opens a route to create electromagnetic absorbers for real and not only numerical applications and as an example we introduce a layered absorber for the wavelength of $8$~$\\mu$m made of SiO$_2$ and NaCl. We also show that similar cylindrical core-shell nanostructures derived from flat multilayers also exhibit very good absorptive and reflective properties despite the different geometry.

  7. A Perfect Electromagnetic Cavity: High Quality Factor in Subwavelength Dimensions

    Science.gov (United States)

    Ginis, Vincent; Tassin, Philippe; Soukoulis, Costas M.; Veretennicoff, Irina

    2010-03-01

    Transformation optics has recently provided a new way to look at the interaction between light and matter. It uses the analogy between the macroscopic Maxwell's equations in complex dielectrics and the free-space Maxwell's equations on the background of an arbitrary metric to exploit the full potential of metamaterials, of which the most exciting examples are invisibility cloaks. In this contribution, we want to show how transformation optics can be applied to design a cavity with extraordinary properties. We have demonstrated theoretically the existence of eigenmodes whose wavelength is much larger than the characteristic dimensions of the cavity. Furthermore, our design avoids the bending losses observed in traditional microcavities, so that the quality factor is only limited by intrinsic absorption of the materials. Such a ``perfect cavity'' may be interesting for applications involving optical data storage or quantum optics, where it can be used to control the rate of spontaneous emission through the Purcell effect.

  8. SURFACE EFFECT ON NANOSIZED VOID GROWTH IN A RIGID-PERFECTLY PLASTIC MATERIAL

    Institute of Scientific and Technical Information of China (English)

    Tong Hui; Yiheng Chen

    2008-01-01

    The influence of the surface effect on the nanosized spherical void growth in a rigid-perfectly plastic material is analyzed and the mechanism of the nanosized void growth with high triaxiality is given. Based on the Rice and Tracey model for a macro void growth, the present model is proposed to account for the nanosized void growth under a uniform remote strain rate field with consideration on the surface effect. It is concluded that the surface effect yields an evident resistant influence on the nanosized void growth. That is, this influence decays as the void radius increases. With high triaxiality, the nanosized void growth is divided into two stages:the initial stage and the mature stage. At the first stage, the void grows slowly and the influence of surface effect is relatively weak, whereas at the second stage, the influene is significant and the void grows drastically.

  9. Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    Science.gov (United States)

    Stuchlík, Z.; Pugliese, D.; Schee, J.; Kučáková, H.

    2015-09-01

    We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularities. These are spherically symmetric vacuum solutions of the modified Hořava quantum gravity, characterized by a dimensionless parameter ω M^2, combining the gravitational mass parameter M of the spacetime with the Hořava parameter ω reflecting the role of the quantum corrections. In dependence on the value of ω M^2, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures, demonstrating clear distinction to the properties of the torii in the Schwarzschild spacetimes. In all of the K-S naked singularity spacetimes the tori are located above an "antigravity" sphere where matter can stay in a stable equilibrium position, which is relevant for the stability of the orbiting fluid toroidal accretion structures. The signature of the K-S naked singularity is given by the properties of marginally stable tori orbiting with the uniform distribution of the specific angular momentum of the fluid, l= const. In the K-S naked singularity spacetimes with ω M^2 > 0.2811, doubled tori with the same l= const can exist; mass transfer between the outer torus and the inner one is possible under appropriate conditions, while only outflow to the outer space is allowed in complementary conditions. In the K-S spacetimes with ω M^2 < 0.2811, accretion from cusped perfect fluid tori is not possible due to the non-existence of unstable circular geodesics.

  10. A perfect storm in interventional pain management: regulated, but unbalanced.

    Science.gov (United States)

    Benyamin, Ramsin M; Datta, Sukdeb; Falco, Frank J E

    2010-01-01

    Interventional pain management now stands at the crossroads at what is described as "the perfect storm." The confluence of several factors has led to devastating results for interventional pain management. This article seeks to provide a perspective to various issues producing conditions conducive to creating a "perfect storm" such as use and abuse of interventional pain management techniques, and in the same context, use and abuse of various non-interventional techniques. The rapid increase in opioid drug prescribing, costs to health care, large increases in death rates, and random and rampant drug testing, can also lead to increases in health care utilization. Other important aspects that are seldom discussed include medico-legal and ethical perspectives of individual and professional societal opinions and the interpretation of diagnostic accuracy of controlled diagnostic blocks. The aim of this article is to discuss the impact of several factors on interventional pain management and overuse, abuse, waste, and fraud; inappropriate application without evidence-based literature support (sometimes leading to selective use or non-use of randomized or observational studies for proving biased viewpoints - post priori rather than a priori), and issues related to multiple professional societies having their own agendas to push rather than promulgating the science of interventional pain management. This perspective is based on a review of articles published in this issue of Pain Physician, information in the public domain, and other relevant articles. Based on the results of this review, various issues of relevance to modern interventional pain management are discussed and the viewpoints of several experts debated. In conclusion, supporters of interventional pain management disagree on multiple aspects for various reasons while detractors claim that interventional pain management should not exist as a speciality. Issues to be addressed include appropriate use of evidence

  11. 异域想象与文人观念:论晚明清初通俗小说中胡僧形象的色情化%Exotic Imagination and Literati's Ideas:The Eroticization of Foreign Monks in Late-Ming and Early-Qing Vernacular Fiction

    Institute of Scientific and Technical Information of China (English)

    薛英杰

    2016-01-01

    Foreign monks in vernacular fiction in late Ming and early Qing Dynasties are often con‐structed as lascivious characters who are associated with having black faces ,keeping aphrodisiacs and teaching men sexual techniques .Characterized by a lack of elaboration of monks'identities ,descriptions a‐bout eroticized foreign monks are quite similar in terms of physical appearances and plots .Furthermore , many terms for sexual practice in Tantric Buddhism and Taoism are applied to the art of the bedchamber in these descriptions .Therefore ,this paper argues that the eroticization of foreign monks is not terribly rele‐vant to the transmission of Tibetan Tantric Buddhism in China .To a great extent ,in the late Ming and early Qing Dynasties the literati represent foreign monks as a threat to their moral identity ,w hich betrays a suppression of their sexual desire in Confucian culture .%作为一个色情符号,晚明清初通俗小说中被色情化的胡僧与黑面、春药、房中术有着固定的联想关系。胡僧的身份定位非常模糊,其体貌描写和情节模式高度类型化。胡僧色情描写所涉及的密教及道教内容经常被混淆为房中秘戏。小说对胡僧色情形象的符号化建构,与藏传密教的内传并无直接的联系,在很大程度上可以被视作文人异域想象的结果。胡僧色情形象所折射出来的是文人对外来宗教人士的警惕和被儒家文化所压抑的欲望。

  12. Mechanism of resonant perfect optical absorption in dielectric film supporting metallic grating structures.

    Science.gov (United States)

    Chen, Xiumei; Yan, Xiaopeng; Li, Ping; Mou, Yongni; Wang, Wenqiang; Guan, Zhiqiang; Xu, Hongxing

    2016-08-22

    The mechanism of resonant perfect optical absorbers is quantitatively revealed by the coupled mode method for the air/grating/dielectric film/air four region system. The sufficient and necessary conditions of the perfect optical absorption are derived from the interface scattering coefficients analyses. The coupling of the Fabry-Perot modes in the grating slits and non-zero order quasi waveguide modes in the dielectric film play a key role for the perfect optical absorption when the light is incident from the grating side. The analytical sufficient and necessary conditions of the perfect optical absorption provide an efficient tool towards geometry design for the perfect optical absorption at the specific wavelengths. The advantages of a widely tunable perfect optical absorption wavelength, a high Q factor and the confined energy loss on metal surfaces make the air/grating/film/air structures promising for applications in sensing, modulation and detection.

  13. Perfectly matched layers for the stationary Schrodinger equation in a periodic structure

    CERN Document Server

    Kalvin, Victor

    2008-01-01

    We construct a perfectly matched absorbing layer for stationary Schrodinger equation with analytic slowly decaying potential in a periodic structure. We prove the unique solvability of the problem with perfectly matched layer of finite length and show that solution to this problem approximates a solution to the original problem with an error that exponentially tends to zero as the length of perfectly matched layer tends to infinity.

  14. Polarization-insensitive FSS-based perfect metamaterial absorbers for GHz and THz frequencies

    National Research Council Canada - National Science Library

    Cumali Sabah; Furkan Dincer; Muharrem Karaaslan; Emin Unal; Oguzhan Akgol

    2014-01-01

      New perfect frequency selective surface (FSS) metamaterial absorbers (MAs) based on resonator with dielectric configuration are numerically presented and investigated for both microwave and terahertz frequency ranges...

  15. 北宋法远禅师与浮山佛教文化的兴盛%Buddhist Monk Fayuan in Northern Song Dynasty and Flourishing of Buddhism Culture in Fushan Mountain

    Institute of Scientific and Technical Information of China (English)

    宋豪飞

    2016-01-01

    安徽枞阳浮山佛教历史悠久,始于晋梁,北宋时达到鼎盛。法远禅师对浮山佛教道场的声名传扬厥功甚伟。法远禅师实乃禅宗临济宗法系,而非见诸方志所载为曹洞宗传人。法远与欧阳修“因棋说法”使得欧阳修对佛教由排斥转而护持,也促使浮山佛教文化走向鼎盛,名满天下。法远禅师晚年于浮山会圣岩著《九带》传世,叙佛祖奥义,以阐扬佛法。%Buddhism in Zongyang Fushan Mountain in Anhui has a long history, which began from Jin and Liang Dynasties and reached its peak in Northern Song Dynasty. Fayuan, from Rinzai Zen instead of Caodong Sect, makes great contribution to the development of Buddhism in Fushan Mountain. Fayuan preached Buddhism by playing chess with Ouyang Xiu,which helps Fushan Buddhist culture promoted its peak. Fayuan Monk wrote Jiudai in his old age, elaborating Buddhism.

  16. 明初高丽僧人满空与泰山佛教的复兴%The Great Gaoli Monk Mankong and the Revival of Mountain Tai Buddhism During Early Ming Dynasty

    Institute of Scientific and Technical Information of China (English)

    蒋铁生

    2011-01-01

    自唐中叶以来,佛教在中国由盛而衰,类似隋唐频繁的中外佛教交往已鲜见于史。几百年之后,在中华文化根深蒂固的泰山,一位来自高丽的僧人满空,通过重建竹林寺,复兴普照寺,在泰山兴佛取得了成功。这是泰山佛教历史的盛事,也是中韩两国在文化交往史上的佳话。%Since the middle of Tang Dynasty, Buddhism began to decline in China, and such international Buddhism communication as that of Sui and Tang Dynasties was witnessing its rarity. Several hundred years later, at the foot of Mountain Tai which is ingrained with Chinese culture, a great monk Mankong from Gaoli, recovered Puzhao Temple, a decayed Chinese temple. It is a grand event in the history of Mountain Tai Buddhism, and also a significant occasion in the history of cultural communication between China and Korea. The paper probes into the abrupt but non - accidental event with Mountain Tai historical inscriptions, local chronicles and the evolution of Chinese Buddhism.

  17. Numerical Reconstruction of Perfectly Conducting Inclusions from One Electrostatic Boundary Measurement

    DEFF Research Database (Denmark)

    Karamehmedovic, Mirza; Knudsen, Kim; Wriedt, Thomas

    Electrical Impedance Tomography (EIT) aims to reconstruct inhomogeneities or inclusions in the interior of a medium based on current and voltage measurements at the boundary of the medium. In many practical applications of EIT, the e±ciency of the employed numerical inversion scheme is an essential...... in the potentials with the measured current or voltage at the medium boundary can be numerically costly. We describe a novel method for the reconstruction of perfectly electrically conducting inclusions in arbitrary homogeneous, simply connected media of ¯nite conductivity and with su±ciently smooth boundary...... occur at the analytic stage only, and the actual numerical computation involves neither forward-model sources nor boundary-error minimisation. The method requires inclusions to be placed relatively close to the boundary of the medium, and it is well-suited for detection of small inclusions...

  18. Validation of extremes within the Perfect-Predictor Experiment of the COST Action VALUE

    Science.gov (United States)

    Hertig, Elke; Maraun, Douglas; Wibig, Joanna; Vrac, Mathieu; Soares, Pedro; Bartholy, Judith; Pongracz, Rita; Mares, Ileana; Gutierrez, Jose Manuel; Casanueva, Ana; Alzbutas, Robertas

    2016-04-01

    Extreme events are of widespread concern due to their damaging consequences on natural and anthropogenic systems. From science to applications the statistical attributes of rare and infrequent occurrence and low probability become connected with the socio-economic aspect of strong impact. Specific end-user needs regarding information about extreme events depend on the type of application, but as a joining element there is always the request for easily accessible climate change information with a clear description of their uncertainties and limitations. Within the Perfect-Predictor Experiment of the COST Action VALUE extreme indices modelled from a wide range of downscaling methods are compared to reference indices calculated from observational data. The experiment uses reference data from a selection of 86 weather stations representative of the different climates in Europe. Results are presented for temperature and precipitation extremes and include aspects of the marginal distribution as well as spell-length related aspects.

  19. Effects of quadratic and cubic nonlinearities on a perfectly tuned parametric amplifier

    Science.gov (United States)

    Neumeyer, S.; Sorokin, V. S.; Thomsen, J. J.

    2017-01-01

    We consider the performance of a parametric amplifier with perfect tuning (two-to-one ratio between the parametric and direct excitation frequencies) and quadratic and cubic nonlinearities. A forced Duffing-Mathieu equation with appended quadratic nonlinearity is considered as the model system, and approximate analytical steady-state solutions and corresponding stabilities are obtained by the method of varying amplitudes. Some general effects of pure quadratic, and mixed quadratic and cubic nonlinearities on parametric amplification are shown. In particular, the effects of mixed quadratic and cubic nonlinearities may generate additional amplitude-frequency solutions. In this case an increased response and a more phase sensitive amplitude (phase between excitation frequencies) is obtained, as compared to the case with either pure quadratic or cubic nonlinearity. Furthermore, jumps and bi-stability in the amplitude-phase characteristics are predicted, supporting previously reported experimental observations.

  20. Engineering the Complex-Valued Constitutive Parameters of Metamaterials for Perfect Absorption.

    Science.gov (United States)

    Wang, Pengwei; Chen, Naibo; Tang, Chaojun; Chen, Jing; Liu, Fanxin; Sheng, Saiqian; Yan, Bo; Sui, Chenghua

    2017-12-01

    We theoretically studied how to directly engineer the constitutive parameters of metamaterials for perfect absorbers of electromagnetic waves. As an example, we numerically investigated the necessary refractive index n and extinction coefficient k and the relative permittivity ε and permeability μ of a metamaterial anti-reflection layer, which could cancel the reflection from a hydrogenated amorphous silicon (α-Si:H) thin film on a metal substrate, within the visible wavelength range from 300 to 800 nm. We found that the metamaterial anti-reflection layer should have a negative refractive index (n  0) for long-wavelength visible light. The relative permittivity ε and permeability μ could be fitted by the Lorentz model, which exhibited electric and magnetic resonances, respectively.