cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Supplemental Information from Thermal thresholds heighten sensitivity of West Nile virus transmission to changing temperatures in coastal California
Creators: name: Skaff, Nicholas K.
name: Cheng, Qu
name: Clemesha, Rachel E. S.
name: Collender, Philip A.
name: Gershunov, Alexander
name: Head, Jennifer R.
name: Hoover, Christopher M.
name: Lettenmaier, Dennis P.
name: Rohr, Jason R.
name: Snyder, Robert E.
name: Remais, Justin V.
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Health Care
subject: Diseases
subject: 111706 Epidemiology
subject: FOS: Health sciences

description: Temperature is widely known to influence the spatio-temporal dynamics of vector-borne disease transmission, particularly as temperatures vary across critical thermal thresholds. When temperature conditions exhibit such ‘transcritical variation’, abrupt spatial or temporal discontinuities may result, generating sharp geographical or seasonal boundaries in transmission. Here, we develop a spatio-temporal machine learning algorithm to examine the implications of transcritical variation for West Nile virus (WNV) transmission in the Los Angeles metropolitan area (LA). Analysing a large vector and WNV surveillance dataset spanning 2006–2016, we found that mean temperatures in the previous month strongly predicted the probability of WNV presence in pools of Culex quinquefasciatus mosquitoes, forming distinctive inhibitory (10.0–21.0°C) and favourable (22.7–30.2°C) mean temperature ranges that bound a narrow 1.7°C transitional zone (21–22.7°C). Temperatures during the most intense months of WNV transmission (August/September) were more strongly associated with infection probability in Cx. quinquefasciatus pools in coastal LA where temperature variation more frequently traversed the narrow transitional temperature range compared to warmer inland locations. This contributed to a pronounced expansion in the geographical distribution of human cases near the coast during warmer-than-average periods. Our findings suggest that transcritical variation may influence the sensitivity of transmission to climate warming, and that especially vulnerable locations may occur where present climatic fluctuations traverse critical temperature thresholds.
Anisotropic disclination cores in nematic liquid crystals modelled by a self consistent molecular field theory
Creators: name: Schimming, Cody D.
name: Viñals, Jorge
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Disclination configurations of a nematic liquid crystal are studied within a self-consistent molecular field theory. The theory is based on a tensor order parameter, and can accommodate anisotropic elastic energies without the known divergences in the Landau-de Gennes formulation. Our results agree with the asymptotic results of Dzyaloshinsky for the Frank-Oseen energy and far from the defect core, but reveal biaxial order at intermediate distances from the core, crossing over to uniaxial, but isotropic configurations as the core is approached. The elastic terms considered in our energy allow for separate control of surface tension, anchoring, and elasticity contrast, and are used to analyze recent results for lyotropic chromonic liquid crystals. The latter display unusually large defect cores (on the order of tens of microns) which can be used for a quantitative comparison with the theory. Both $\pm 1/2$ disclination configurations are well reproduced by our calculations. Elastic anisotropy is also shown to lead to qualitative changes in the disclination polarization, a quantity that is proportional to the active stress in models of active matter.
ESM Table S1 from Repeated evidence that the accelerated evolution of sperm is associated with their fertilization function
Creators: name: Fitzpatrick, John L.
name: C. Daisy Bridge
name: Snook, Rhonda R.
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences

description: Raw data, accession numbers and references of the data used in the analyses.
Dynamical screening in a quark gluon plasma
Creators: name: Mustafa, Munshi G.
name: Chakraborty, Purnendu
name: Thoma, Markus H
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the screening potential of a fast parton moving through a quark-gluon plasma in the framework of semi-classical transport theory. We found an anisotropic potential showing a minimum in the direction of the parton velocity. Possible consequences of this potential on binary states in a quark-gluon plasma are discussed.
description: 4 pages (including 2 figures) prepared with J. Phys. G format for conference proceedings: Talk given in the 5th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP - 2005) held in Kolkata, INDIA, during February 8-12, 2005
Quantum Hall effective action for anisotropic Dirac semi-metal
Creators: name: Hoyos, Carlos
name: Lier, Ruben
name: Peña-Benitez, Francisco
name: Surówka, Piotr
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a study of Hall transport in semi-Dirac critical phases. The construction is based on a covariant formulation of relativistic systems with spatial anisotropy. Geometric data together with external electromagnetic fields is used to devise an expansion procedure that leads to a low-energy effective action consistent with the discrete $PT$ symmetry that we impose. We use the action to discuss terms contributing to the Hall transport and extract the coefficients. We also discuss the associated scaling symmetry.
description: 6 pages + supplementary material, 1 figure
Ejection of close-in super-Earths around low-mass stars in the giant impact stage
Creators: name: Matsumoto, Yuji
name: Gu, Pin-Gao
name: Kokubo, Eiichiro
name: Oshino, Shoichi
name: Omiya, Masashi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Earth-sized planets were observed in close-in orbits around M dwarfs. While more and more planets are expected to be uncovered around M dwarfs, theories of their formation and dynamical evolution are still in their infancy. We investigate the giant impact growth of protoplanets, which includes strong scattering around low-mass stars. The aim is to clarify whether strong scattering around low-mass stars affects the orbital and mass distributions of the planets. We perform $N$-body simulation of protoplanets by systematically surveying the parameter space of the stellar mass and surface density of protoplanets. We find that protoplanets are often ejected after twice or three times close-scattering around late M dwarfs. The ejection sets the upper limit of the largest planet mass. Adopting the surface density scaling linearly with the stellar mass, we find that as the stellar mass decreases less massive planets are formed in orbits with higher eccentricities and inclinations. Under this scaling, we also find that a few close-in protoplanets are generally ejected. The ejection of protoplanets plays an important role in the mass distribution of super-Earths around late M dwarfs. The mass relation of observed close-in super-Earths and their central star mass is well reproduced by ejection.
description: accepted for publication in A&A
How kinetics drives the two- to three-dimensional transition in semiconductor strained heterostructures: the case of InAs/GaAs(001)
Creators: name: Arciprete, F.
name: Placidi, E.
name: Sessi, V.
name: Fanfoni, M.
name: Patella, F.
name: Balzarotti, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The two- to three-dimensional growth transition in the InAs/GaAs(001) heterostructure has been investigated by atomic force microscopy. The kinetics of the density of three dimensional quantum dots evidences two transition thresholds at 1.45 and 1.59 ML of InAs coverage, corresponding to two separate families, small and large. Based on the scaling analysis, such families are characterized by different mechanisms of aggregation, involving the change of the critical nucleus size. Remarkably, the small ones give rise to a wealth of "monomers" through the erosion of the step edges, favoring the explosive nucleation of the large ones.
description: 10 pages, 3 figures. Submitted to Phys. Rev. Lett
Is entanglement entropy proportional to area?
Creators: name: Ahmadi, Morteza
name: Das, Saurya
name: Shankaranarayanan, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is known that the entanglement entropy of a scalar field, found by tracing over its degrees of freedom inside a sphere of radius ${\cal R}$, is proportional to the area of the sphere (and not its volume). This suggests that the origin of black hole entropy, also proportional to its horizon area, may lie in the entanglement between the degrees of freedom inside and outside the horizon. We examine this proposal carefully by including excited states, to check probable deviations from the area law.
description: 6 pages. Based on talk by S. Das at Theory Canada 1, Vancouver, 3 June, 2005. To be published in a special edition of the Canadian Journal of Physics. Minor changes to match published version
Effect of using different transporting agents in the Growth of Tin monochalcogenides on its photoelectrochemical behaviour
Creators: name: Sandip Unadkat
Publisher: name: figshare
Year: 2020
Subjects: subject: Condensed Matter Physics
subject: FOS: Physical sciences

description: In this paper authors have attempted to fabricate pEC solar cells wiih SnS crystals grown using different transporting agents. Energy band location and redox analysis of the material have been made using Mott - Schottky plots. These studies justify the selection of an appropriate electrolyte for PEC work. Various solar cells fabricated with single crystals of SnS (PVT), SnS (Ir) and SnS (NH,CI) have been prepared. The solar cell parameters e.g. the fill factor (FF), open circtrit voltage (Voc), short circuit clrrrent (Isc) and efficiency (n) for all the different cells have determined- In order to s€e the effect of using different transporting agents in the growth of SnS on its photoresponse, the electrolyte and intensity of illumination were kept constantand all the electrodes were prepared from crystals showing absolutely plane faces obtained through the act of cleavage with thehelp of an adhesive tape. The results have been thoroughly described and the implications have been discussed.
Pairing in a two-component ultracold Fermi gas: phases with broken space symmetries
Creators: name: Sedrakian, Armen
name: Mur-Petit, Jordi
name: Polls, Artur
name: Müther, Herbert
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We explore the phase diagram of a two-component ultracold atomic Fermi gas interacting with zero-range forces in the limit of weak-coupling. We focus on the dependence of the pairing gap and the free energy on the variations in the number densities of the two species while the total density of the system is held fixed. As the density asymmetry is increased, the system exhibits a transition from a homogenous Bardeen-Cooper-Schrieffer (BCS) phase to phases with spontaneously broken global space symmetries. One such realization is the deformed Fermi surface superfluidity (DFS) which exploits the possibility of deforming the Fermi-surfaces of the species into ellipsoidal form at zero total momentum of Cooper pairs. The critical asymmetries at which the transition from the DFS to the unpaired state occurs are larger than those for the BCS phase. In this precritical region the DFS phase lowers the condensation energy of the asymmetric BCS state. We compare quantitatively the DFS phase to another realization of superconducting phases with broken translational symmetry - the single plane wave Larkin-Ovchinnikov-Fulde-Ferrell (LOFF)phase, which is characterized by a non-vanishing center-of-mass momentum of the Cooper pairs. The possibility of the detection of the DFS phase in the time-of-flight experiments is discussed and quantified for the case of $^6$Li atoms trapped in two different hyperfine states.
description: 9 pages, uses RevTex4, v2: minor changes, matches published version
Supersymmetric extensions of Schrödinger-invariance
Creators: name: Henkel, Malte
name: Unterberger, Jeremie
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The set of dynamic symmetries of the scalar free Schrödinger equation in d space dimensions gives a realization of the Schrödinger algebra that may be extended into a representation of the conformal algebra in d+2 dimensions, which yields the set of dynamic symmetries of the same equation where the mass is not viewed as a constant, but as an additional coordinate. An analogous construction also holds for the spin-1/2 Lévy-Leblond equation. A N=2 supersymmetric extension of these equations leads, respectively, to a `super-Schrödinger' model and to the (3|2)-supersymmetric model. Their dynamic supersymmetries form the Lie superalgebras osp(2|2) *_s sh(2|2) and osp(2|4), respectively. The Schrödinger algebra and its supersymmetric counterparts are found to be the largest finite-dimensional Lie subalgebras of a family of infinite-dimensional Lie superalgebras that are systematically constructed in a Poisson algebra setting, including the Schrödinger-Neveu-Schwarz algebra sns^(N) with N supercharges. Covariant two-point functions of quasiprimary superfields are calculated for several subalgebras of osp(2|4). If one includes both N=2 supercharges and time-inversions, then the sum of the scaling dimensions is restricted to a finite set of possible values.
description: Latex 2e, 46 pages, with 3 figures included
Los derechos de propiedad en la agricultura de regadio: su situacion frente al cambio institucional
Creators: name: Miranda, Dionisio Ortiz
name: Delgado, Felisa Cena
name: Miranda, Dionisio Ortiz
name: Delgado, Felisa Cena
Publisher: name: Unknown
Year: 2001
Subjects: subject: Institutional and Behavioral Economics
subject: Water economy
subject: Property rights
subject: Institutional change

description: RESUMEN - La economía del agua en España se encuentra en una fase de cambio institucional, cuyo desarrollo va a estar fuertemente condicionado por la estructura de los derechos de propiedad sobre el agua. Esta estructura, en un contexto como el de la agricultura de regadío, está caracterizada por un complejo entramado de instituciones informales y percepciones de los propios regantes. El objetivo del artículo es caracterizar dichos derechos de propiedad -mediante una desagregación previa de su contenido- en el ámbito de las Comunidades de Regantes del Guadalquivir, con la finalidad de analizar cómo pueden desarrollarse las nuevas instituciones en dicho contexto. Los resultados, basados tanto en el análisis de las instituciones formales como en las opiniones de los regantes, ponen de manifiesto la falta de adecuación del cambio institucional a las demandas de los regantes, así como los obstáculos que la estructura de los derechos de propiedad puede presentar al mismo. SUMMARY - The Spanish water economy is within a process of institutional change. The development of this change will be strongly conditioned by the water property rights structure, and this structure -in the context of irrigated agriculture- is defined by a complex net of informal institutions and farmers' perceptions. The objective of the article is to characterise these property rights -through previous desegregation of its content- in the context of Irrigation Districts of the Guadalquivir basin, in order to analyse how the new institutions could be performed in this environment. Results, based in both the analysis of formal institutions and farmers' opinion, show (i) the lack of adaptation of new institutions to farmers' demands, and (ii) some characteristics of the property rights structure which could hinder the institutional change.
Extension of the INFN Tier-1 on a HPC system
Creators: name: Boccali, Tommaso
name: Pra, Stefano Dal
name: Spiga, Daniele
name: Ciangottini, Diego
name: Zani, Stefano
name: Bozzi, Concezio
name: De Salvo, Alessandro
name: Valassi, Andrea
name: Noferini, Francesco
name: Agnello, Luca dell
name: Stagni, Federico
name: Doria, Alessandra
name: Bonacorsi, Daniele
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The INFN Tier-1 located at CNAF in Bologna (Italy) is a center of the WLCG e-Infrastructure, supporting the 4 major LHC collaborations and more than 30 other INFN-related experiments. After multiple tests towards elastic expansion of CNAF compute power via Cloud resources (provided by Azure, Aruba and in the framework of the HNSciCloud project), and building on the experience gained with the production quality extension of the Tier-1 farm on remote owned sites, the CNAF team, in collaboration with experts from the ALICE, ATLAS, CMS, and LHCb experiments, has been working to put in production a solution of an integrated HTC+HPC system with the PRACE CINECA center, located nearby Bologna. Such extension will be implemented on the Marconi A2 partition, equipped with Intel Knights Landing (KNL) processors. A number of technical challenges were faced and solved in order to successfully run on low RAM nodes, as well as to overcome the closed environment (network, access, software distribution, ... ) that HPC systems deploy with respect to standard GRID sites. We show preliminary results from a large scale integration effort, using resources secured via the successful PRACE grant N. 2018194658, for 30 million KNL core hours.
description: 13 pages
Evolucion economica y analisis de resultados en una muestra de explotaciones lecheras del occidentede Asturias (1993-1998)
Creators: name: Mendez, Jose Antonio Perez
name: Cabezas, Angel Machado
name: Mendez, Jose Antonio Perez
name: Cabezas, Angel Machado
Publisher: name: Unknown
Year: 2001
Subjects: Livestock Production/Industries

description: RESUMEN - Este trabajo tiene un doble objetivo: primero, un análisis de la evolución económica de una muestra de 42 explotaciones lecheras del occidente asturiano, en el período 1993-1998, y segundo, un estudio de la situación final (1998), identificando los rasgos que caracterizan a las unidades con mejores resultados económicos. Para ello se estudia la evolución de la productividad de la mano de obra, la cuenta de resultados, la variación en el margen sobre concentrados, el umbral de rentabilidad, y el valor añadido y su distribución; al igual que, con la ayuda del análisis de la varianza y de la regresión logística, se caracteriza a las unidades con mejores resultados en 1998 en su gestión a corto y largo plazo. Se observa la importancia de una dimensión adecuada para rentabilizar factores indivisibles como la maquinaria, instalaciones y mano de obra, además de la necesidad de gestionar convenientemente todos los factores determinantes del margen de contribución por litro de leche. SUMMARY - This research has a double aim: first, an analysis of economic evolution in a sample of 42 dairy farms from western Asturias in the period of 1993-1998, and second, a study of the final situation (1998), identifying the characteristics of the units with better economic results. To be able to do this, we study the evolution of labour productivity, the variation in the margin over concentrated feeds, the break-even point, and the added value and its distribution. The analysis of variance and the logistic regression allow us to identify the traits from farms with the highest profits in 1998, in the short and long run. The research points out the importance of a proper size in order to make indivisible factors like machinery, installations and labour profitable and the need for adequately managing all factors that determine the contribution margin per litre of milk.
การจัดการขยะ: บทบาทของสำนักหอสมุดมหาวิทยาลัยรังสิตกับการพัฒนาที่ยั่งยืน
Creators: name: ลมัย ประคอนสี
Publisher: name: สำนักหอสมุด มหาวิทยาลัยรังสิต
Year: 2563
Subjects: การจัดการของเสีย
การพัฒนาอย่างยั่งยืน
การจัดการขยะ

description: วารสารรังสิตสารสนเทศ, 26, ฉบับพิเศษ, 206-223
Quantum mechanical modeling of anharmonic phonon-phonon scattering in nanostructures
Creators: name: Guo, Yangyu
name: Bescond, Marc
name: Zhang, Zhongwei
name: Luisier, Mathieu
name: Nomura, Masahiro
name: Volz, Sebastian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The coherent quantum effect becomes increasingly important in the heat dissipation bottleneck of semiconductor nanoelectronics with the characteristic size shrinking down to few nano-meters scale nowadays. However, the quantum mechanical model remains elusive for anharmonic phonon-phonon scattering in extremely small nanostructures with broken translational symmetry. It is a long-term challenging task to correctly simulate quantum heat transport including anharmonic scattering at a scale relevant to practical applications. In this article, we present a clarified theoretical formulation of anharmonic phonon non-equilibrium Green function (NEGF) formalism for both 1D and 3D nanostructures, through a diagrammatic perturbation expansion and an introduction of Fourier representation to both harmonic and anharmonic terms. A parallelized computational framework with first-principle force constants input is developed for large-scale quantum heat transport simulation. Some crucial approximations in numerical implementation are investigated to ensure the balance between numerical accuracy and efficiency. A quantitative validation is demonstrated for the anharmonic phonon NEGF formalism and computational framework by modeling cross-plane heat transport through silicon thin film. The phonon-phonon scattering is shown to be appreciable and to introduce about 20% reduction of thermal conductivity at room temperature even for a film thickness around 10 nm. The present methodology provides a robust platform for the device quantum thermal modeling, as well as the study on the transition from coherent to incoherent heat transport in nano-phononic crystals. This work thus paves the way to understand and to manipulate heat conduction via the wave nature of phonons.
description: 47 pages, 16 figures
การจัดการสภาพแวดล้อมสีเขียว สำนักหอสมุด มหาวิทยาลัยรังสิต
Creators: name: ดาวรัตน์ แท่นรัตน์
Publisher: name: สำนักหอสมุด มหาวิทยาลัยรังสิต
Year: 2563
Subjects: การจัดการด้านสิ่งแวดล้อม
ภาวะโลกร้อน
สำนักงานสีเขียว
การพัฒนาที่ยั่งยืน
การจัดการความปลอดภัย

description: วารสารรังสิตสารสนเทศ, 26, ฉบับพิเศษ, 224-253
Theoretical uncertainties for measurements of alpha_s from electroweak observables
Creators: name: Stenzel, H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: One of the most precise measurements of the strong coupling constant alpha_s(MZ) is obtained in the context of global analyses of precision electroweak data. This article reviews the sensitivity of different electroweak observables to alpha_s and describes the perturbative uncertainties related to missing higher orders. The complete renormalisation scale dependence for the relevant observables is calculated at next-to-next-to-leading order and a new method is presented to determine the corresponding perturbative uncertainty for measurements of alpha_s based on these observables.
description: v4: Revised version with new tables and figures
Opportunities and Challenges for Machine Learning in Materials Science
Creators: name: Morgan, Dane
name: Jacobs, Ryan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Advances in machine learning have impacted myriad areas of materials science, ranging from the discovery of novel materials to the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this field, it is challenging to understand both the breadth of opportunities as well as best practices for their use. In this review, we address aspects of both problems by providing an overview of the areas where machine learning has recently had significant impact in materials science, and then provide a more detailed discussion on determining the accuracy and domain of applicability of some common types of machine learning models. Finally, we discuss some opportunities and challenges for the materials community to fully utilize the capabilities of machine learning.
Comparacion de la ordenacion contingente y del experimento de eleccion en la valoracion de las funciones no privadas de los bosques
Creators: name: Amoros, Joan Mogas
name: Riera, Pere
name: Amoros, Joan Mogas
name: Riera, Pere
Publisher: name: Unknown
Year: 2001
Subjects: subject: Environmental Economics and Policy
subject: environmental valuation
subject: contingent ranking
subject: choice experiment
subject: afforestation

description: RESUMEN - En este trabajo se presenta una comparación entre dos métodos de valoración de preferencias declaradas: la ordenación contingente y el experimento de elección. Se incluye una aplicación empírica en la que se valoran los impactos que una determinada forestación de terrenos agrícolas en Cataluña tendría sobre la función recreativa, de absorción de CO2 y de protección frente a la erosión de los bosques. Los resultados muestran diferencias entre los valores obtenidos a partir de los dos métodos, siendo los del método de elección significativamente mayores. Además, esta divergencia se mantiene cuando se comparan observaciones pairwise obtenidas directamente a través del método de elección con las simulaciones pairwise procedentes de la ordenación contingente. ABSTRACT: This paper presents a comparison between two stated preference methods: the contingent ranking and the choice experiment. An empirical application is included, involving the valuation of the effects that would have a specific program to convert some agricultural land into forest land in Catalonia. The valuation exercise considers a forest recreational function, carbon storage, and erosion protection. The results show some differences between the values derived from the two methods, with the choice experiment values being significantly greater. Moreover, the differences are kept when comparing pairwise observations derived from the choice experiments with simulated pairwise observations derived from the contingent ranking.
Type II Hermite-Padé approximation to the exponential function
Creators: name: Kuijlaars, A. B. J.
name: Stahl, H.
name: Van Assche, W.
name: Wielonsky, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: We obtain strong and uniform asymptotics in every domain of the complex plane for the scaled polynomials $a (3nz)$, $b (3nz)$, and $c (3nz)$ where $a$, $b$, and $c$ are the type II Hermite-Padé approximants to the exponential function of respective degrees $2n+2$, $2n$ and $2n$, defined by $a (z)e^{-z}-b (z)=Ø(z^{3n+2})$ and $a (z)e^{z}-c (z)=Ø(z^{3n+2})$ as $z\to 0$. Our analysis relies on a characterization of these polynomials in terms of a $3\times 3$ matrix Riemann-Hilbert problem which, as a consequence of the famous Mahler relations, corresponds by a simple transformation to a similar Riemann-Hilbert problem for type I Hermite-Padé approximants. Due to this relation, the study that was performed in previous work, based on the Deift-Zhou steepest descent method for Riemann-Hilbert problems, can be reused to establish our present results.
description: 20 pages, 5 figures
Formacion de expectativas de precio en el sector hortofruticola exportador del sureste espanol
Creators: name: Gomez, Emilio Galdeano
name: Gomez, Emilio Galdeano
Publisher: name: Unknown
Year: 2001
Subjects: subject: Demand and Price Analysis
subject: Price expectations
subject: supply of agrarian products
subject: rational expectations
subject: horticultural sector

description: RESUMEN - La diferencia temporal existente entre la planificación de la oferta y la demanda de productos agrarios, conlleva a que, tradicionalmente, en sectores como el de frutas y hortalizas cobren gran interés las teorías sobre formación de expectativas de precios. En las últimas décadas, la tendencia hacia una mayor interrelación entre la producción y la comercialización (en origen) presente en entidades asociativas implica un aumento de la disponibilidad y utilización de la información para realizar previsiones sobre las distintas variables. El objeto de este estudio es determinar empíricamente la existencia de estimaciones sobre el precio, tomando como referencia actividad productora-comercializadora del sector hortofrutícola del sureste español, que tiene como destinos principales los mercados y centros de distribución alimentaria en el ámbito de la Unión Europea. Para ello, se parte de la combinación de las formulaciones tradicionales de expectativas basadas en variables retardadas y de los modelos de expectativas racionales. Dicho método permite deducir el uso de información complementaria a los retardos de precio; adicionalmente, se analiza la relación de este hecho con el grado de respuesta de la oferta ante las oscilaciones de precio, así como, con la eficiencia en la formación de expectativas. SUMMARY - The temporal difference existing between the planning of the supply and the demand of agrarian products has caused that the theories about the formation of price expectations have a traditionally great importance in such sectors as those of vegetables and fruits. The tendency to a greater connexion between production and commercialisation in associated entities (in productive place) implies an increase of the efficiency on the use of available information to make forecasts on the different variables in the market. The aim of the present study is to determine empirically the existence of price valuations, taking as a reference the production-comercialisation in the south-eastern horticultural sector of Spain, consider enterprises that sell fruits and vegetable institutions of food distribution in the framework of the European Union. For this purpuse, it has been started from the combination of traditional formulations of expectations based on retarded variables, on the one hand, and models of rational expectations, on the other. By this method is deduced the use of complementary information to the price retards; also, the relation existing between that use of information to both the degree of response of the supply regarding the fluctuations in prices and the efficiency on expectative formation is analysed.
REVIEW ON PHARMACOGNOSTIC AND PHARMACOLOGICAL STUDY OF DRACEANA TRIFACIATA PLANT
Creators: name: Gitanjlee Kasar*, Vishal Rasve, Sayyad Gaffar, Sanjay Garje
Publisher: name: Zenodo
Year: 2024

description: Dracaena trifasciata (prain) Mabb. (Asparagaceae) is a perennial herb, commonly known as snake plant, native to West Africa, cultivated as ornamental plant in homes and parks. The leaves and rhizomes are traditionally used against acne, fungal infection, skin itches, herpes zoester, allergy, ulcer, helminths, pharyngitis, urinary tract infection, jaundice, jaundice, analgesic and antipyretic, antimicrobial and antidiabetic in various countries. This review comprehensively describes the Botany, traditional use, Pharmacognosy, and Pharmacology of multidimensional herb.

Keywords: Draceana trifaciata, pharmacology, pharmacognosy, fungal infection, herpes zoester, allergy, anti- microbial
SYNTHESIS OF GeTe0.1Se0.9 SINGLE CRYSTALS AND ITS STRUCTURAL AND OPTICAL CHARACTERIZATION
Creators: name: Sandip Unadkat
Publisher: name: figshare
Year: 2020
Subjects: subject: Condensed Matter Physics
subject: FOS: Physical sciences

description: This paper represents the investigation on growth of single crystals of GeTe0.1Se0.9 using Chemical Vapour Transport (CVT) technique using Iodine as a transporting agent. Photographs of Energy Dispersive Analysis of X- ray (EDAX) reveals that GeTe0.1Se0.9 single crystals are nearly stoichiometrically perfect. Structural confirmation of these crystals was accomplished by X- ray diffraction and it shows that GeTe0.1Se0.9 has hexagonal closed packed crystal structure and lattice parameters have been calculated. The electron diffraction pattern/photograph confirms the single crystallinity of the grown crystal. A study of microstructures on this crystal has been made and its layered pattern is found. The characterization of optical band gap has been calculated at room temperature throughout the wavelength 200 – 2500 nm near the fundamental absorption edge. It shows that grown crystals have direct and indirect energy gaps of 1.08 eV and 0.8 eV respectively.
Crecimiento económico y exclusión social en la agricultura familiar argentina
Creators: name: Lattuada, Mario
name: Estrada, Eduardo Moyano
name: Lattuada, Mario
name: Estrada, Eduardo Moyano
Publisher: name: Unknown
Year: 2001
Subjects: subject: Farm Management
subject: Farming policy
subject: Rural society
subject: Social exclusion
subject: Family agriculture.

description: RESUMEN - En este artículo, sus autores analizan el proceso de crecimiento económico experimentado por Argentina en la década de los noventa y sus efectos sobre la agricultura de la región pampeana. Este trabajo pretende contribuir, desde una perspectiva sociológica, al debate sobre las posibilidades y limitaciones de reproducción de la agricultura familiar en un contexto marcado por la aplicación de programas de ajuste estructural y de retirada del Estado de muchas de sus tradicionales áreas de actuación. Para ello, en primer lugar, se describen los indicadores productivos y económicos que dan cuenta de la evolución del sector agropecuario argentino en la última década. En segundo lugar, se exponen los distintos factores que contribuyeron al deterioro del poder adquisitivo de los pequeños agricultores y acentuaron sus condiciones de vulnerabilidad. En tercer lugar, se muestra cómo debido a esa situación, el creciente endeudamiento del sector agropecuario y la evidencia de un acelerado proceso de disminución en el número de las explotaciones agrarias de la región pampeana. Finalmente, en las conclusiones, se plantea una reflexión sobre las causas de la exclusión social y económica de los pequeños y medianos agricultores argentinos en un contexto de apertura, de-regulación y retirada estatal y, con la aportación de algunas experiencias internacionales, se proponen cambios en las políticas agrarias para que sean más sensibles a la dimensión social de la sustentabilidad. SUMMARY - This article focuses on the process of economic growth that Argentina underwent during the nineties and its effects on the Pampeana region's farming sector. Its main goal is to contribute, from a sociological point of view, to the debate on the possibilities and limitations of family agriculture to reproduce itself in a context characterized by the implementation of structural ajustement programs. Firstly, the article describes the evolution of the most important economic indicators of Pampeana farming sector during the last decade. Secondly, it points out the different elements which both provoked the deterioration of the small farmers' incomes and increased its social and economic weakness. Thirdly, it shows the growing debtment of Pampa farmers and, consequently, the reduction of the number of farms in that region. Finally, the authors offer some ideas on the process of social exclusion of small and middle farmers in a context of open markets where the role of the State is restricted. From starting of the European experiences, they propose changes for agricultural policies to be more sensitive to the social dimension of sustainability.
Magnetic Fields in the Formation of the First Stars. I. Theory vs. Simulation
Creators: name: McKee, Christopher F.
name: Stacy, Athena
name: Li, Pak Shing
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: While magnetic fields are important in contemporary star formation, their role in primordial star formation is unknown. Magnetic fields of order 10^-16 G are produced by the Biermann battery due to the curved shocks and turbulence associated with the infall of gas into the dark matter minihalos that are the sites of formation of the first stars. These fields are rapidly amplified by a small-scale dynamo until they saturate at or near equipartition with the turbulence in the central region of the gas. Analytic results are given for the outcome of the dynamo, including the effect of compression in the collapsing gas. The mass-to-flux ratio in this gas is 2-3 times the critical value, comparable to that in contemporary star formation. Predictions of the outcomes of simulations using smooth particle hydrodynamics (SPH) and grid-based adaptive mesh refinement (AMR) are given. Because the numerical viscosity and resistivity for the standard resolution of 64 cells per Jeans length are several orders of magnitude greater than the physical values, dynamically significant magnetic fields affect a much smaller fraction of the mass in simulations than in reality. An appendix gives an analytic treatment of free-fall collapse, including that in a constant density background. Another appendix presents a new method of estimating the numerical viscosity; results are given for both SPH and grid-based codes.
description: 28 pages, 4 figures, submitted to MNRAS
Matriz de intercambios de agua. Analisis mediante la Teoria de Grafos
Creators: name: Alonso, Esther Velazquez
name: Alonso, Esther Velazquez
Publisher: name: Unknown
Year: 2003
Subjects: subject: Resource /Energy Economics and Policy
subject: Water consumption
subject: Graphs Theory
subject: Input-Output Analysis

description: Resumen Nos planteamos como objetivo poner de manifiesto las relaciones que se establecen entre los sectores productivos y el consumo de agua que éstos realizan para generar su producción. Aplicamos el estudio a Andalucía, Comunidad Autónoma del sur de España caracterizada por su escasez de agua, y nos preguntamos si la dependencia excesiva de los recursos hídricos que algunos sectores productivos de dicha Comunidad pueden llegar a tener, podría afectar de forma negativa, no sólo a la conservación y a la calidad del recurso, sino también a la sostenibilidad de la propia economía. Utilizamos una metodología mixta en la que combinamos el análisis Input-Output, con el que definimos un modelo de consumo de agua y a partir de él elaboramos una Matriz de Intercambios de Agua, con la Teoría de Grafos, mediante la cual analizamos las relaciones contenidas en dicha matriz. Concluimos que la especialización económica de Andalucía no sólo no contribuye a la conservación del recurso sino que además podría llegar a poner en peligro la propia sostenibilidad de la economía regional si los dirigentes políticos no asumen estas limitaciones hídricas en la definición de su política económica. PALABRAS CLAVE: Consumo de agua, Teoría de Grafos, Análisis Input-Output. Summary The aim of this work is to demonstrate the relationships established between an economy's productive sectors and the water consumption generated during their productive processes. We study de Andalusian reality, region of the South Spain characterized by its scarcity, and we will examine if the excessive dependence on water resources which may occur in some productive sectors might affect not only the conservation and quality of this resource, but also have negative effects upon the stability of the economy itself. A mixed methodology has been used, combining Input-Output analysis with Graphs Theory. We obtain a water Input-Output model and an interrelationship matrix which is analysed by Graphs Theory. The main conclusion is that Andalusian's economic specialisation does not make a positive contribution water conservation and, moreover, the regional economy's sustainability might be seriously endangered if the authorities do not take into account water limitations in their economy policy.
Frequency and surface dependence of the mechanical loss in fused silica
Creators: name: Penn, Steven D.
name: Ageev, Alexander
name: Busby, Dan
name: Harry, Gregory M.
name: Gretarsson, Andri M.
name: Numata, Kenji
name: Willems, Phil
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We have compiled measurements of the mechanical loss in fused silica from samples spanning a wide range of geometries and resonant frequency in order to model the known variation of the loss with frequency and surface-to-volume ratio. This improved understanding of the mechanical loss has contributed significantly to the design of advanced interferometric gravitational wave detectors, which require ultra-low loss materials for their test mass mirrors.
description: 5 pages, 3 figure but 5 figure files
SYNTHESIS, STRUCTURAL AND PHOTO ELECTROCHEMICAL BEHAVIOUR OF SnSe0.5Te0.5 SINGLE CRYSTALS
Creators: name: Sandip Unadkat
Publisher: name: figshare
Year: 2020
Subjects: subject: Condensed Matter Physics
subject: FOS: Physical sciences

description: This paper report the synthesis of SnSe0.5Te0.5 by direct vapour transport technique. These crystals having layered type structure and are therefore highly anisotropic. Increase interest in these materials have also been shown particular in the photoelectric properties, as it has been suggested that the material could be used successful as photosensitive film in TV camera tube. This single crystals obtained have been characterized by X-ray diffraction. Single crystalline nature of crystal has been verified through transmission electron microscopy. Optical absorption spectra of this crystal at ambient pressure and temperature were obtained in the range 200 nm to 2200 nm using UV-Visible near IR spectrophotometer. The spectra were analyzed in the absorption range to obtain direct and indirect band gap of as grown material. Authors have also fabricate photoelectrochemical solar cell using SnSe0.5Te0.5 single crystals to determine fill factor (F. F), open circuit voltage (Voc), short circuit current (Isc) and efficiency (η) different intensity of illuminations at room temperature. The electrode was prepared from crystals showing absolutely plane faces obtained through the act of cleavage with help of adhesive tape. All results have been carefully studied and their implications have been thoroughly discussed
ACREAGE PLANTING DECISION ANALYSIS OF SOUTH CAROLINA TOMATOES: NERLOVIAN VERSUS JUST RISK MODEL
Creators: name: Fu, Tsu-Tan
name: Fletcher, Stanley M.
name: Epperson, James E.
name: Fu, Tsu-Tan
name: Fletcher, Stanley M.
name: Epperson, James E.
Publisher: name: Unknown
Year: 1986
Subjects: Crop Production/Industries

description: Factors which explain supply response behavior of South Carolina tomato growers were determined. Two well known supply response models were used for comparison: the Nerlovian structural model and the Just risk model. The Just risk model reflected the significance of the risk effect in both stable and unstable periods. An evaluation of forecasting power between the two models was indeterminate. Growers are apparently willing to invest in more information with increased market instability because growers were influenced by the Florida winter price of tomatoes in planting decisions during the period of instability.
Automated Unit Test Generation for Python
Creators: name: Lukasczyk, Stephan
name: Kroiß, Florian
name: Fraser, Gordon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Automated unit test generation is an established research field, and mature test generation tools exist for statically typed programming languages such as Java. It is, however, substantially more difficult to automatically generate supportive tests for dynamically typed programming languages such as Python, due to the lack of type information and the dynamic nature of the language. In this paper, we describe a foray into the problem of unit test generation for dynamically typed languages. We introduce Pynguin, an automated unit test generation framework for Python. Using Pynguin, we aim to empirically shed light on two central questions: (1) Do well-established search-based test generation methods, previously evaluated only on statically typed languages, generalise to dynamically typed languages? (2) What is the influence of incomplete type information and dynamic typing on the problem of automated test generation? Our experiments confirm that evolutionary algorithms can outperform random test generation also in the context of Python, and can even alleviate the problem of absent type information to some degree. However, our results demonstrate that dynamic typing nevertheless poses a fundamental issue for test generation, suggesting future work on integrating type inference.
description: 15 pages, to be published in Proceedings of the 12th Symposium on Search-Based Software Engineering (SSBSE 2020)
Basic properties of galaxy clustering in the light of recent results from the Sloan Digital Sky Survey
Creators: name: Joyce, M.
name: Labini, F. Sylos
name: Gabrielli, A.
name: Montuori, M.
name: Pietronero, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss some of the basic implications of recent results on galaxy correlations published by the SDSS collaboration. In particular we focus on the evidence which has been recently presented for the scale and nature of the transition to homogeneity in the galaxy distribution, and results which describe the dependence of clustering on luminosity. The two questions are in fact strictly entangled, as the stability of the measure of the amplitude of the correlation function depends on the scale at which the mean density becomes well defined. We note that the recent results which indicate the convergence to well defined homogeneity in a volume equivalent to that of a sphere of radius 70 Mpc/h, place in doubt previous detections of ``luminosity bias'' from measures of the amplitude of the correlation function. We emphasize that the way to resolve these issues is to first use, in volume limited samples corresponding to different ranges of luminosity, the unnormalized two point statistics to establish the scale (and value) at which the mean density becomes well defined. We note also that the recent SDSS results for these statistics are in good agreement with those obtained by us through analyses of many previous samples, confirming in particular that the galaxy distribution is well described by a fractal dimension D ~ 2 up to a scale of at least 20 Mpc/h. We discuss critically the agreement of this new data with current theoretical models.
description: 6 pages, 1 figure. Revised version with minor corrections. To be published in Astronomy and Astrophysics