cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The densest lattice in twenty-four dimensions
Creators: name: Cohn, Henry
name: Kumar, Abhinav
Publisher: name: arXiv
Year: 2004
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: Primary 11H31, 52C15, Secondary 05B40, 11H55

description: In this research announcement we outline the methods used in our recent proof that the Leech lattice is the unique densest lattice in R^24. Complete details will appear elsewhere, but here we illustrate our techniques by applying them to the case of lattice packings in R^2, and we discuss the obstacles that arise in higher dimensions.
description: 10 pages
Uma Análise Comparativa Entre Paises Sobre A Resposta dos Agregados Familiares À Mortalidade de Adultos na África Rural Sub-Sahariana: Implicações Para Políticas de Mitigaçao de HIV/SIDA e Desenvolvimento Rural.
Creators: name: Mather, David
name: Donovan, Cynthia
name: Jayne, Thomas S.
name: Weber, Michael T.
name: Mazhangara, Edward
name: Bailey, Linda
name: Koo, Kyeongwon
name: Yamano, Takashi
name: Mghenyi, Elliot W.
name: Mather, David
name: Donovan, Cynthia
name: Jayne, Thomas S.
name: Weber, Michael T.
name: Mazhangara, Edward
name: Bailey, Linda
name: Koo, Kyeongwon
name: Yamano, Takashi
name: Mghenyi, Elliot W.
Publisher: name: Unknown
Year: 2004
Subjects: subject: Health Economics and Policy
subject: food security
subject: food policy
subject: Mozambique

description: This flash edition summarizes the results of different studies on effect of adults’ death at active age in rural households. This study includes Kenya, Malawi, Mozambique, Rwanda and Zambia, and uses national representative households’ survey data, in order to provide some useful guidelines for efficient priority setting and key policy development, in the effort for mitigation of rural adult death effects. The main findings are: 1) the incidence of adult death at active age caused by illness is a good proxy for incidence of death related to HIV/AIDS; 2) in 4 out of 5 studied countries, most of the adults who died at active age are not household heads or their spouses, and hence, they are not likely to be the main providers of households’ livelihood; 3) in Kenya, Malawi and Rwanda, the HIV infected adults who recently died in rural areas, seems not to be related to high income and education; 4) the analysis of household composition shows that the affected households do not seem to have less active adult labor availability than the non-affected households. 5) The use of homogeny concept of affected households, especially in directed relief, technology development and other programs or policies is questionable; 6) the heterogeneity in the indicators of well-being after the death and in which extent the effects of adult mortality are translated into crop production and household income, has important implications in policy development.
description: Resultados das Investigações do Departmento de Análise de Políticas, MADER, Direcção de Economia, em collaboração com a Universidade Estatal de Michigan
Timing performance of the LHCb VELO Timepix3 Telescope
Creators: name: Heijhoff, K.
name: Akiba, K.
name: van Beuzekom, M.
name: Bosch, P.
name: Buytaert, J.
name: Campbell, M.
name: Colijn, A. P.
name: Collins, P.
name: Dall'Occo, E.
name: Evans, T.
name: Geertsema, R.
name: Heidotting, M. L. E.
name: Hynds, D.
name: Cudie, X. Llopart
name: Schindler, H.
name: Snoek, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We performed a detailed study of the timing performance of the LHCb VELO Timepix3 Telescope with a 180 GeV/c mixed hadron beam at the CERN SPS. A twofold method was developed to improve the resolution of single-plane time measurements, resulting in a more precise overall track time measurement. The first step uses spatial information of reconstructed tracks in combination with the measured signal charge in the sensor to correct for a mixture of different effects: variations in charge carrier drift time; variations in signal induction, which are the result of a non-uniform weighting field in the pixels; and lastly, timewalk in the analog front-end. The second step corrects for systematic timing offsets in Timepix3 that vary from -2 ns to 2 ns. By applying this method, we improved the track time resolution from 438$\,\pm\,$16 ps to 276$\,\pm\,$4 ps.
Buyer Market Power and Vertically Differentiated Retailers
Creators: name: Wang, Shinn-Shyr
name: Rojas, Christian
name: Lavoie, Nathalie
name: Wang, Shinn-Shyr
name: Rojas, Christian
name: Lavoie, Nathalie
Publisher: name: Unknown
Year: 2010
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Community/Rural/Urban Development
subject: Crop Production/Industries
subject: Farm Management
subject: Financial Economics
subject: Food Security and Poverty
subject: Industrial Organization
subject: Marketing
subject: FOS: Economics and business
subject: buyer market power
subject: vertical differentiation
subject: Wal-Mart

description: We consider a model of vertical competition where downstream firms (retailers) purchase an upstream input from a monopolist and are able to differentiate from each other in terms of quality. Our primary focus is to study the effects of introducing a large retailer, such as a Wal-Mart Supercenter, that is able to lower wholesale prices (i.e. buyer market power). We obtain two main results. First, the store with no buyer market power responds to the presence of the large retailer by increasing its quality, a finding that is consistent with recent efforts by traditional retailers to enhance shoppers’ buying experience (i.e. quality). Second, the presence of a large retailer causes consumer welfare to increase. There are, however, two reasons for the increase in consumer welfare: consumers gain from the large retailer’s low price (because the upstream discount is partially passed on to the retail price) as well as from the high quality level offered by the traditional retailer. Contrary to the conventional wisdom most of the consumer welfare gains seem due to the latter. The intuition for this result is that price competition softens substantially as a result of firms’ quality differentiation. We also investigate the effects of buyer market power on retail and wholesale prices as well as on producer welfare.
Collapsing domain walls in the two-Higgs-doublet model and deep insights from the EDM
Creators: name: Chen, Ning
name: Li, Tong
name: Teng, Zhaolong
name: Wu, Yongcheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We study the domain wall solutions in the general two-Higgs-doublet model (2HDM) with a CP-violating phase. The 2HDM with the spontaneouse CP violation is found to have domain wall solutions whose tensions are $\mathcal{O}(10^6)\,{\rm GeV}^3$, which are excluded by the Zel'dovich-Kobzarev-Okun bound. With the explicit CP-violating (CPV) terms as the so-called biased term in the scalar potential, domain walls can collapse in the early Universe. The sizes of the explicit CP violation can be constrained from the Big Bang nucleosynthesis. This constraint is converted to the CPV mixing of $α_c$, and is mostly sensitive to the mass splittings between two heavy neutral Higgs bosons. We estimate the possible gravitational wave signals and the electric dipole moment (EDM) predictions due to the domain wall collapsing. It turns out that the peak spectrum of the GW from the domain wall collapsing cannot be probed in any future program. In contrast, the untenable regions with very tiny explicit CPV parameter in the Higgs potential has been partially excluded by the latest electron EDM measurements at the ACME-II and will be further confirmed or excluded by the future ACME-III projection.
description: 33 pages, 8 figures, matches the published version
Variational Approach to Tunneling Dynamics. Application to Hot Superfluid Fermi Systems. Spontaneous and Induced Fission
Creators: name: Levit, Shimon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We introduce a general variational framework to address the tunneling of hot Fermi systems. We use the representation of the trace of the imaginary time $τ=it$ propagator as a functional integral type of a sum over complete sets of states at intermediate propagation slices. We assume that these states are $τ$-dependent and generated by an arbitrary trial Hamiltonian $H_0(τ)$. We then use the convexity inequality to derive $H_0(τ)$ controlled variational bound for a trial action functional. This functional has a general structure consisting of two parts - statistically weighted quantum penetrability and dynamical tunneling entropy. We examine how this structure incorporates the basic physics of tunneling of hot Fermi systems. Using the variational inequality one can optimise the dynamical parameters controlling the action functional for any choice of the trial problem. As an application we take $H_0(τ)$ to describe imaginary time dynamics of non interacting Bogoliubov-de Gennes (BdG) quasiparticles. Optimising its dynamical parameters we extend the tunneling theory of hot Fermi systems to the Hartree-Fock-Bogoliubov(HFB) frame and derive the corresponding generalisation of imaginary time temperature dependent BdG mean field equations. As in the trial action the prominent feature of these equations is an inseparable interplay between quantum dynamical and entropic statistical effects. In the zero temperature limit these equations describe the "false ground state" tunneling decay of superfluid Fermi systems (spontaneous fission in nuclear physics). With increasing excitation energy (effective temperature) the decay process is gradually evolving from pure quantum tunneling to statistical "bottle neck" escape mechanism.
XALQARO AVTOMOBIL TASHUVLARINI BOSHQARISH VA RAQAMLASHTIRISH: XALQARO AVTOMOBIL TRANSPORTIDA  "E-PERMIT" AXBOROT TIZIMINING ROLI
Creators: name: Jo'rayev, Azamat
name: Hamrayeva, Nasiba
Publisher: name: Zenodo
Year: 2024

description: Avtomobilda xalqaro tashuv xalqaro savdoning ajralmas qismi bo‘lib, bojxona, transport va xavfsizlik standartlariga rioya qilishni ta'minlash uchun keng qamrovli tartibga soluvchi tartibga bo‘ysunadi. “E-permit” tizimi, ruxsat berish jarayonlarini raqamlashtirish va avtomatlashtirish orqali, bu sohani modernizatsiya qilishda hal qiluvchi vositalar sifatida paydo bo‘lmoqda, shaffoflikni, samaradorlikni va tashuvlarni barqarorligini oshirmoqda. Ushbu maqola xalqaro avtomobil transportida e-permit tizimining hozirgi holatini o‘rganib chiqadi, ularning foydalari, qiyinchiliklari va kelajakdagi imkoniyatlarini tahlil qiladi. Xalqaro avtomobilda yuk tashuvchilari va logistika operatorlarining tajribalari ushbu tizimlar sohani qanday o‘zgartirayotgani va aqlli, barqaror transport yo‘lini qanday ochayotganini ko‘rsatadi.
Análisis de la demanda de alimentos en España considerando el impacto de la dieta sobre la salud
Creators: name: Angulo, Ana Maria
name: Mtimet, Nadhem
name: Gil, Jose Maria
name: Angulo, Ana Maria
name: Mtimet, Nadhem
name: Gil, Jose Maria
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Demanda de alimentos
subject: salud
subject: calidad de la dieta
subject: España.

description: RESUMEN - En este trabajo se analiza la demanda de alimentos en España considerando la relación existente entre salud y dieta. Se plantea la maximización de una función de utilidad que depende de las cantidades demandadas de los distintos alimentos y del nivel de salud alcanzado, sujeto a dos restricciones: la presupuestaria y la relativa a la función de producción de salud. La solución al problema conduce a la estimación conjunta de un sistema de ecuaciones con dos componentes, una ecuación referida a la calidad de la dieta y un sistema de demanda de alimentos. Los resultados obtenidos indican, por un lado, que la introducción de la calidad de la dieta en un sistema de demanda (frente a un modelo que incluya únicamente renta y precios) modifica las elasticidades renta, aumentando en el caso de los productos más saludables. Por otro lado, se pone de manifiesto que un aumento en el nivel de calidad de la dieta conlleva un aumento en la valoración de los cereales y las patatas y una disminución en el grupo de aceites y carnes, principalmente.
Layering transitions for adsorbing polymers in poor solvents
Creators: name: Krawczyk, J.
name: Owczarek, A. L.
name: Prellberg, T.
name: Rechnitzer, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: An infinite hierarchy of layering transitions exists for model polymers in solution under poor solvent or low temperatures and near an attractive surface. A flat histogram stochastic growth algorithm known as FlatPERM has been used on a self- and surface interacting self-avoiding walk model for lengths up to 256. The associated phases exist as stable equilibria for large though not infinite length polymers and break the conjectured Surface Attached Globule phase into a series of phases where a polymer exists in specified layer close to a surface. We provide a scaling theory for these phases and the first-order transitions between them.
description: 4 pages, 4 figures
Interpretation of the angular dependence of the de Haas-van Alphen effect in MgB_2
Creators: name: Carrington, A.
name: Fletcher, J. D.
name: Harima, H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present detailed results for the amplitude and field dependence of the de Haas-van Alphen (dHvA) signal arising from the electron-like $π$ sheet of Fermi surface in MgB_2. Our data and analysis show that the dip in dHvA amplitude when the field is close to the basal plane is caused by a beat between two very similar dHvA frequencies and not a spin-zero effect as previously assumed. Our results imply that the Stoner enhancement factors in MgB_2 are small on both the Sigma and Pi sheets.
description: 4 pages with figures. Submitted to PRB
Análisis de intensidades energéticas y emisiones de CO2 a partir de la matriz de contabilidad social de Andalucía del año 2000
Creators: name: Cardenete, Manuel Alejandro
name: Fuentes Saguar, Patricia D.
name: Polo, Clemente
name: Cardenete, Manuel Alejandro
name: Fuentes Saguar, Patricia D.
name: Polo, Clemente
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Emisiones de CO2
subject: matriz de contabilidad social
subject: multiplicadores energéticos

description: RESUMEN - En este artículo se estiman las intensidades energéticas y emisiones de CO2 para la economía andaluza en el año 2000. Las intensidades energéticas de las ramas productivas se calculan en varios escenarios empleando un modelo SAM especificado con la matriz de contabilidad social elaborada por los autores. Las emisiones se estiman con el modelo input-output, distinguiendo la polución intermedia de la originada por la demanda final. Los resultados muestran la existencia de importantes variaciones en intensidades entre ramas y también las sustanciales variaciones que acaecen al endogeneizar el consumo y la inversión. La estimación de las emisiones en el año base resulta bastante satisfactoria y las simulaciones realizadas muestran el sustancial impacto que tienen los incrementos de la demanda final interior.
Large cardinals and continuity of coordinate functionals of filter bases in Banach spaces
Creators: name: Kania, Tomasz
name: Swaczyna, Jarosław
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: Primary 46B20, 46H40, Secondary 03E55, 03E60

description: Assuming the existence of certain large cardinal numbers, we prove that for every projective filter $\mathscr F$ over the set of natural numbers, $\mathscr{F}$-bases in Banach spaces have continuous coordinate functionals. In particular, this applies to the filter of statistical convergence, thereby we solve a problem by V. Kadets (at least under the presence of certain large cardinals). In this setting, we recover also a result of Kochanek who proved continuity of coordinate functionals for countably generated filters (Studia Math., 2012).
description: 10 pp
A Case for Nothing
Creators: name: Sohil Bhatia
Publisher: name: Carnegie Mellon University
Year: 2020
Subjects: subject: 190502 Fine Arts (incl. Sculpture and Painting)
subject: FOS: Arts (arts, history of arts, performing arts, music)

description: This thesis studies the alternative potentials and multiplicity of nothing as opposed to its common interpretation as invisibility, absence and the void. The contemplative as well as delinear discussion is furthered to investigate other possible iterations of nothing as a result of language, loss of memory and naturalisation of thingness. The thesis conflates a thing and nothing, and absences and presences to co-exist, and elaborates on their dualism as opposed to amutually exclusive being; in an attempt to generate visibility for the unseen and to privilege absences in a fast paced and image saturated culture. Resultantly I outline the motivations and pressing concerns of my practice through a meeting of art and life as well as derive from the practices of Mendieta, Torres and Neunschwander in order to lay out a lineage for minimal practice that evades its relationship to the minimalists but embraces soft silences and addressesthe absent bodies’ relationship to space.
Contribution of weak localization to non local transport at normal metal / superconductor double interfaces
Creators: name: Mélin, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In connection with a recent experiment [Russo {\it et al.}, Phys. Rev. Lett. {\bf 95}, 027002 (2005)], we investigate the effect of weak localization on non local transport in normal metal / insulator / superconductor / insulator / normal metal (NISIN) trilayers, with extended interfaces. The negative weak localization contribution to the crossed resistance can exceed in absolute value the positive elastic cotunneling contribution if the normal metal phase coherence length or the energy are large enough.
description: 9 pages, 7 figures, minor modifications
The Kantowski-Sachs Space-Time in Loop Quantum Gravity
Creators: name: Modesto, Leonardo
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We extend the ideas introduced in the previous work to a more general space-time. In particular we consider the Kantowski-Sachs space time with space section with topology $R \times S^2$. In this way we want to study a general space time that we think to be the space time inside the horizon of a black hole. In this case the phase space is four dimensional and we simply apply the quantization procedure suggested by Loop Quantum Gravity and based on an alternative to the Schroedinger representation introduced by H. Halvorson. Through this quantization procedure we show that the inverse of the volume density and the Schwarzschild curvature invariant are upper bounded and so the space time is singularity free. Also in this case we can extend dynamically the space time beyond the classical singularity.
description: 7 pages, latex. We introduced the Schwarzschild curvature invariant spectrum
RISK MANGEMENT FRAMEWORKS IN INDUSTRIAL COMPANIES
Creators: name: Makhmudova, Nodirakhon
Publisher: name: Zenodo
Year: 2024

description: The article explores different concepts in risk management, such as risk minimization, acceptable risk levels, and the idea of risk as a resource. It primarily focuses on approaches to managing production and economic risks, highlighting key systemic elements of risk and their influence on decision-making processes. The benefits of effective risk management are also addressed. The article underscores the significance of employing an active risk management strategy to achieve long-term objectives.
Wave interactions and the analysis of the perturbed Burgers equation
Creators: name: Veksler, Alex
name: Zarmi, Yair
Publisher: name: arXiv
Year: 2005
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: In multiple-front solutions of the Burgers equation, all the fronts, except for two, are generated through the inelastic interaction of exponential wave solutions of the Lax pair associated with the equation. The inelastically generated fronts are the source of two difficulties encountered in the standard Normal Form expansion of the approximate solution of the perturbed Burgers equation, when the zero-order term is a multiple-front solution: (i) The higher-order terms in the expansion are not bounded; (ii) The Normal Form (equation obeyed by the zero-order approximation) is not asymptotically integrable; its solutions lose the simple wave structure of the solutions of the un-perturbed equation. The freedom inherent in the Normal Form method allows a simple modification of the expansion procedure, making it possible to overcome both problems in more than one way. The loss of asymptotic integrability is shifted from the Normal Form to the higher-order terms (part of which has to be computed numerically) in the expansion of the solution. The front-velocity update is different from the one obtained in the standard analysis.
description: 30 pages, including 10 figures
Significance of nuclear quantum effects in hydrogen bonded molecular chains
Creators: name: Cahlík, Aleš
name: Hellerstedt, Jack
name: Mendieta-Moreno, Jesús I.
name: Švec, Martin
name: Santhini, Vijai M.
name: Pascal, Simon
name: Soler-Polo, Diego
name: Erlingsson, Sigurdur I.
name: Výborný, Karel
name: Mutombo, Pingo
name: Marsalek, Ondrej
name: Siri, Olivier
name: Jelínek, Pavel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In hydrogen bonded systems, nuclear quantum effects such as zero-point motion and tunneling can significantly affect their material properties through underlying physical and chemical processes. Presently, direct observation of the influence of nuclear quantum effects on the strength of hydrogen bonds with resulting structural and electronic implications remains elusive, leaving opportunities for deeper understanding to harness their fascinating properties. We studied hydrogen-bonded one-dimensional quinonediimine molecular networks which may adopt two isomeric electronic configurations via proton transfer. Herein, we demonstrate that concerted proton transfer promotes a delocalization of π-electrons along the molecular chain, which enhances the cohesive energy between molecular units, increasing the mechanical stability of the chain and giving rise to new electronic in-gap states localized at the ends. These findings demonstrate the identification of a new class of isomeric hydrogen bonded molecular systems where nuclear quantum effects play a dominant role in establishing their chemical and physical properties. We anticipate that this work will open new research directions towards the control of mechanical and electronic properties of low-dimensional molecular materials via concerted proton tunneling.
El valor del uso recreativo del Parque Natural Sierra de María-Los Velez (Almería)
Creators: name: Castillo, Ma Encarnacion
name: Sayadi, Samir
name: Cena, Felisa
name: Castillo, Ma Encarnacion
name: Sayadi, Samir
name: Cena, Felisa
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Método del coste de viaje
subject: Parque Natural de Almería
subject: uso recreativo
subject: valoración de recursos naturales

description: RESUMEN - El objetivo de este artículo es estimar el valor de uso recreativo de un espacio protegido en el sur de España, el Parque Natural Sierra de María-Los Vélez en Almería, mediante el método del coste de viaje zonal. Los resultados obtenidos muestran un excedente del consumidor, entre 7,67-13,29 €/persona, según el escenario propuesto teniendo en cuenta el tiempo de desplazamiento como un coste o como un disfrute. Finalmente, se presentan algunas conclusiones y, a partir de ellas, se perfilan estrategias con el fin de potenciar el uso recreativo del Parque y mejorar su gestión futura.
Light activated Cl₂ etching of GaAs and optical holographic pattern formation
Creators: name: Whitwick, Michael Brian
Publisher: name: University of British Columbia
Year: 2009

description: The photochemical reaction of Cl₂ gas with (100) GaAs was studied in this work. Thermal effects due to light induced heating of the GaAs substrate were isolated from photochemical effects. Light induced heating was calculated and the corresponding photothermal Cl₂ etching of GaAs was accounted for. The temperature dependence of the photochemical etch rate was examined. The light-induced etch rate potentially follows an Arrhenius temperature dependence with an activation energy of 0.161 eV. Near 200°C the light-induced etch rate does not increase with increasing temperature. The photochemical etch rate was found to depend linearly on intensity. A possible explanation for the temperature dependence of the photochemical etch rates is presented. It is proposed that the desorption of Ga Cl₃ is the important mechanism in the photochemical Cl₂-GaAs etch. GaCl₃ is photodesorbed with illumination, which increases the rate of etching.
Energy Revolution induced by the 3rd positive EMF
Creators: name: Ide, Osamu
Publisher: name: figshare
Year: 2020
Subjects: subject: 91305 Energy Generation, Conversion and Storage Engineering
subject: FOS: Mechanical engineering
subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper was on the site of Energy and Climate Change Committee, House of Commons (UK) in 15 October 2016.The 3rd positive EMF is a new electro-motive-force found by Osamu Ide. The electrical power has been generating by Faraday's EMF since 19 c. The energy source of the power plants are fossil fuel, hydropower, nuclear and wind power. However, the generator the author suggests does not exhaust natural energy source. The generator applies the 3rd positive EMF. The author made a basic experiment to verify the scaling the power up of the generator. Then it is possible to make a power plant by the 3rd positive EMF without natural energy resource.
Evidence for Large Direct CP Violation in B+-=>rho(770)0K+- from Analysis of the Three-Body Charmless B+-=>K+-pi+-pi-+ Decay
Creators: name: Garmash, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report results on a Dalitz analysis of three-body charmless B+-=>K+-pi+-pi-+ decay including searches for direct CP violation. We report the first observation of the decay B+=>f_2(1270)K+ with a statistical significance above 6sigma. We also observe 3.9sigma evidence for large direct CP violation in the B+-=>rho(770)0K+- channel. This is the first evidence for CP violation in a charged meson decay. The results are obtained with a data sample that contains 386 million BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.
description: 6 pages, 3 figures. To be published Physical Review Letters
Cosmological Constraints on a Dynamical Electron Mass
Creators: name: Barrow, John D
name: Magueijo, Joao
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Motivated by recent astrophysical observations of quasar absorption systems, we formulate a simple theory where the electron to proton mass ratio $μ=m_{e}/m_{p}$ is allowed to vary in space-time. In such a minimal theory only the electron mass varies, with $α$ and $m_{p}$ kept constant. We find that changes in $μ$ will be driven by the electronic energy density after the electron mass threshold is crossed. Particle production in this scenario is negligible. The cosmological constraints imposed by recent astronomical observations are very weak, due to the low mass density in electrons. Unlike in similar theories for spacetime variation of the fine structure constant, the observational constraints on variations in $μ$ imposed by the weak equivalence principle are much more stringent constraints than those from quasar spectra. Any time-variation in the electron-proton mass ratio must be less than one part in $10^{9}$since redshifts $z\approx 1.$This is more than one thousand times smaller than current spectroscopic sensitivities can achieve. Astronomically observable variations in the electron-proton must therefore arise directly from effects induced by varying fine structure 'constant' or by processes associated with internal proton structure. We also place a new upper bound of $2\times 10^{-8}$ on any large-scale spatial variation of $μ$ that is compatible with the isotropy of the microwave background radiation.
description: New bounds from weak equivalence principle experiments added, conclusions modified
Rentabilidad económica de explotaciones agrarias de secano según tamaño y tipo de laboreo
Creators: name: Serrano, Arturo
name: Suarez De Cepeda, M.
name: Sanchez-Giron, V.
name: Serrano, Arturo
name: Suarez De Cepeda, M.
name: Sanchez-Giron, V.
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Economic analyses
subject: farm size
subject: rainfed crops
subject: tillage systems

description: RESUMEN - El objetivo de este trabajo es evaluar, desde un punto de vista económico, el efecto que supone pasar de un sistema de laboreo tradicional a uno de laboreo reducido en explotaciones cerealistas de la meseta castellana. Se utilizan datos experimentales de campo para estimar las producciones, así como un sistema de decisión experto para seleccionar el parque de maquinaria que conlleva el menor coste de utilización. La rotación de cultivos que se ha considerado ha sido trigo/leguminosa. No se encontraron diferencias significativas entre los rendimientos obtenidos en los tres sistemas de laboreo comparados. Los resultados económicos se muestran condicionados por el sistema de laboreo empleado y el tamaño de la explotación.
Upper limit on the critical strength of central potentials in relativistic quantum mechanics
Creators: name: Brau, Fabian
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the context of relativistic quantum mechanics, where the Schrödinger equation is replaced by the spinless Salpeter equation, we show how to construct a large class of upper limits on the critical value, $g_{\rm{c}}^{(\ell)}$, of the coupling constant, $g$, of the central potential, $V(r)=-g v(r)$. This critical value is the value of $g$ for which a first $\ell$-wave bound state appears.
description: 8 pages
Una aplicación de la escala de fobia a los alimentos nuevos. El caso de los alimentos étnicos
Creators: name: Camarena-Gomez, Dena M.
name: Sanjuan, Ana Isabel
name: Camarena-Gomez, Dena M.
name: Sanjuan, Ana Isabel
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Ethnic food
subject: food neophobia scale (FNS)
subject: consumption and purchase habits

description: El artículo investiga las actitudes de los consumidores hacia los alimentos nuevos mediante la escala FNS (Food Neo-phobia Scale). Apartir de ella se obtiene el perfil de los individuos más y menos proclives a la introducción de nuevos alimentos en sus dietas, denominados respectivamente, «neo-fílicos » y «neo-fóbicos». Entre estos alimentos nuevos, los étnicos o propios de un país y cultura, están empezando a introducirse en el mercado español, especialmente impulsados por la inmigración. A partir de la escala actitudinal, se obtienen perfiles socio-demográficos y de comportamiento de compra y consumo de alimentos étnicos, claramente distintivos, lo que permite extraer información relevante de cara a la evaluación del potencial del mercado étnico en España.
Energy as an Entanglement Witness for Quantum Many-Body Systems
Creators: name: Dowling, Mark R.
name: Doherty, Andrew C.
name: Bartlett, Stephen D.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate quantum many-body systems where all low-energy states are entangled. As a tool for quantifying such systems, we introduce the concept of the entanglement gap, which is the difference in energy between the ground-state energy and the minimum energy that a separable (unentangled) state may attain. If the energy of the system lies within the entanglement gap, the state of the system is guaranteed to be entangled. We find Hamiltonians that have the largest possible entanglement gap; for a system consisting of two interacting spin-1/2 subsystems, the Heisenberg antiferromagnet is one such example. We also introduce a related concept, the entanglement-gap temperature: the temperature below which the thermal state is certainly entangled, as witnessed by its energy. We give an example of a bipartite Hamiltonian with an arbitrarily high entanglement-gap temperature for fixed total energy range. For bipartite spin lattices we prove a theorem demonstrating that the entanglement gap necessarily decreases as the coordination number is increased. We investigate frustrated lattices and quantum phase transitions as physical phenomena that affect the entanglement gap.
description: 16 pages, 3 figures, published version
Vus from Kl3 Decays
Creators: name: Mescia, Federico
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Important progress made this year, both in theory and in experiment, helped solving the problem of 2 sigma-deviation from the unitarity of the first row elements in the CKM matrix. Today we have, |Vus|^2 + |Vud|^2 + |Vub|^2-1 = -0.0008(13), -0.0010(13), or -0.0005(13), depending on whether the q^2-dependence of the relevant Kl3 form factor is considered as pole-like, linear or quadratic function, and on the Leutwyler-Roos value of f+(0)=0.961(8), whose validity has recently been reinforced by lattice studies. In this talk we summarize the recent developments.
description: Contributed to 32nd International Conference on High-Energy Physics (ICHEP 04), Beijing, China, 16-22 Aug 2004; minor typos corrected
Bound and free atoms diagnosed by the recoil-induced resonances: 1D optical lattice in a working MOT
Creators: name: Brzozowska, Maria
name: Brzozowski, Tomasz M.
name: Zachorowski, Jerzy
name: Gawlik, Wojciech
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report on studies of simultaneous trapping of $^{85}$Rb atoms in a magneto-optical trap (MOT) and 1D optical lattice. Using Raman pump-probe spectroscopy we observe the coexistence of two atomic fractions: the first, which consists of free, unbound atoms trapped in a MOT and the second, localized in the micropotentials of the optical lattice. We show that recoil-induced resonances allow not only temperature determination of the atomic cloud but, together with vibrational resonances, can also be used for real-time, nondestructive studies of the lattice loading and of the dynamics of systems comprising unbound and bound atomic fractions.
description: 6 pages, 7 figures, submitted to PRA
Magnetic Proximity Effect in Perovskite Superconductor/Ferromagnet Multilayers
Creators: name: Stahn, J.
name: Chakhalian, J.
name: Niedermayer, C.
name: Hoppler, J.
name: Gutberlet, T.
name: Voigt, J.
name: Treubel, F.
name: Habermeier, H. -U.
name: Cristiani, G.
name: Keimer, B.
name: Bernhard, C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: $\mathrm{YBa_2Cu_3O_7/La_{2/3}Ca_{1/3}MnO_3}$ superconducting/ferromagnetic (SC/FM) multilayers have been studied by neutron reflectometry. Evidence for a characteristic difference between the structural and magnetic depth profiles is obtained from the occurrence of a structurally forbidden Bragg peak in the FM state. The comparison with simulated reflectivity curves allows us to identify two possible magnetization profiles: a sizable magnetic moment within the SC layer antiparallel to the one in the FM layer (inverse proximity effect), or a ``dead'' region in the FM layer with zero net magnetic moment. The former scenario is supported by an anomalous SC-induced enhancement of the off-specular reflection, which testifies to a strong mutual interaction of SC and FM order parameters.
description: 4 pages, 2 figures, submitted to PRL
Análisis multicriterio de preferencias sociales en gestión hídrica bajo la Directiva Marco del Agua
Creators: name: Mesa, Pascual
name: Martin-Ortega, Julia
name: Berbel, Julio
name: Mesa, Pascual
name: Martin-Ortega, Julia
name: Berbel, Julio
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agricultural and Food Policy
subject: Directiva Marco del Agua
subject: gestión hídrica
subject: método de Jerarquías Analíticas
subject: multicriterio.

description: Este trabajo pretende contribuir a la aplicación de la DMA en relación con la selección de medidas para el uso sostenible y socialmente aceptado del agua. Nuestro análisis está orientado a la obtención, mediante el proceso analítico jerárquico (AHP), de la valoración social de los criterios de gestión del agua en el Guadalquivir, analizando para ello la legitimidad de la ampliación del embalse de la Breña (Córdoba), además de la evaluación de otras posibles medidas de gestión del agua. Los resultados sugieren que el AHP constituye una herramienta adecuada para la implementación de la DMA, así como un complemento útil del análisis coste-eficacia.
On complete affine structures in Lie groups
Creators: name: Gichev, V. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53A15; 53C30; 17D25

description: Left invariant affine structures in a Lie group $G$ are in one-to-one correspondence with left-symmetric algebras over its Lie algebra $\mathfrak g=T_eG$ (``over'' means that the commutator $[x,y]=xy-yx$ coincides with the Lie bracket; left-symmetric algebras can be defined as Lie-admissible algebras such that the multiplication by left defines a representation of the underlying Lie algebra). An affine structure (and the corresponding left symmetric algebra) is complete if $G$ is affinely equivalent to $\mathfrak g$. By the main result of this paper, a complete left symmetric algebra admits a canonical decomposition: there is a Cartan subalgebra $\mathfrak h$ such that the root subspaces for the representations $L$ (by left multiplications) and $\ad$ coincide. Then operators $L(x)$ and $\ad(x)$ have equal semisimple parts for all $x\in\mathfrak h$. This decomposition is unique. For simple complete left-symmetric algebras whose canonical decomposition consists of one dimensional spaces we define two types of graphs and prove some their properties. This makes possible to describe, for dimensions less or equal to 5, these graphs and algebras.
description: 11 pages. This is a translation of a paper published in Russian with nonessential changes in the exposition; the mathematical content is identical
Neutrino mass in GUT constrained supersymmetry with R-parity violation in light of neutrino oscillations
Creators: name: Gozdz, Marek
name: Kaminski, Wieslaw A.
name: Simkovic, Fedor
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The neutrino masses are generated in grand unified theory (GUT) constrained supersymmetric model with R-parity violation. The neutrinos acquire masses via tree-level neutrino-neutralino mixing as well as via one-loop radiative corrections. The theoretical mass matrix is compared with the phenomenological one, which is reconstructed by using neutrino oscillation and neutrinoless double beta decay data. This procedure allows to obtain significantly stronger constraints on R-parity breaking parameters than those existing in the literature. The implication of normal and inverted neutrino mass hierarchy on the sneutrino expectation values, lepton-Higgs bilinear and trilinear R-parity breaking couplings is also discussed.
Prioritization of hydrological maintenance based on geohydromorphometric parameters in Qais river basin, Tartous, Syria
Creators: name: Abdo, Hazem
Publisher: name: figshare
Year: 2020
Subjects: Hydrology

description: Hydrological assessment is an important and vital part of the integrated management of sub-river basins for sustainable development, particularly in wet Mediterranean regions. . The morphological characterization is important to identify the hydrological behavior of the basin for the implementation of management strategies. In this sense, remote sensing data (12.5m digital radiometric modeling model) has been used in the GIS environment to identify critical sub-Qais river basins and priority conservation measures and hydrological maintenance, based on 19 geothermorphometric parameters.It was found that the Ain Al-Fara basin was ranked first in the hydrological maintenance priorities. It was found that this basin achieved the highest result in the dynamics of hydrological surface operations, , which have been demonstrated by all geothermodometric parameters. The method used in this study also emphasizes the importance of using geothermorphometric parameters as one of the advanced indicators in assessing the quality of river basin lands, which is applicable and useful for making better spatial decisions.
Analyse des prix de parité en Afrique de l’Ouest : Le cas du riz depuis la crise de 2007-2008. Rapport de synthèse provisoire.
Creators: name: Diallo, Boubacar Cisse
name: Dembele, Niama Nango
name: Staatz, John M.
name: Diallo, Boubacar Cisse
name: Dembele, Niama Nango
name: Staatz, John M.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Agricultural and Food Policy
subject: Food Security and Poverty
subject: Marketing
subject: FOS: Economics and business
subject: parity price
subject: rice
subject: mali

description: ATELIER REGIONAL DE VALIDATION DE L’ETUDE SUR LES PRIX DE PARITE DU RIZ EN AFRIQUE DE L’OUEST
Inter-orbital p- and d-wave pairings between $d_{xz/yz}$ and $d_{xy}$ orbitals in Sr$_2$RuO$_4$
Creators: name: Chen, Weipeng
name: An, Jin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the pairing symmetry of Sr$_2$RuO$_4$ through the group-theoretical approach. We emphasize the role of pairing interaction between the quasi-one-dimensional(Q1D) $d_{xz/yz}$ and quasi-two-dimensional(Q2D) $d_{xy}$ orbitals. It is found that two degenerate inter-orbital time-reversal-invariant(TRI) p-wave pairings, one is spin-singlet and the other spin-triplet with out-of-plane $\bm{d}$-vector, could be the most promising candidates. Several important physical quantities are presented, including the near-nodal gap structure, the unchanged out-of-plane Knight shift, and no split transition under strain, which are consistent with the experiments. In addition, these p-wave pairings shed light on resolving the contradiction between the time-reversal breaking and reduced in-plane Knight shift measurements. As the system reaches the Van Hove singularity under applied strain, the pairing symmetry would become a d-wave pairing mainly consisting of inter-orbital components, which could be responsible for the strained 3$K$ phase.
description: 11 pages, 5 figures
Weak integrability breaking: chaos with integrability signature in coherent diffusion
Creators: name: Znidaric, Marko
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study how perturbations affect dynamics of integrable many-body quantum systems, causing transition from integrability to chaos. Looking at spin transport in the Heisenberg chain with impurities we find that in the thermodynamic limit transport gets diffusive already at an infinitesimal perturbation. Small extensive perturbations therefore cause an immediate transition from integrability to chaos. Nevertheless, there is a remnant of integrability encoded in the dependence of the diffusion constant on the impurity density, namely, at small densities it is proportional to the square root of the inverse density, instead of to the inverse density as would follow from Matthiessen's rule. We show that Matthiessen's rule has to be modified in non-ballistic systems. Results also highlight a nontrivial role of interacting scattering on a single impurity, and that there is a regime where adding more impurities can actually increase transport.
description: 9 pages; v2: 10 pages
Highly flexible electromagnetic interference shielding films based on ultrathin Ni/Ag composites on paper substrates
Creators: name: Liu, Xiangli
name: Ye, Ziheng
name: Zhang, Ling
name: Feng, Pengdong
name: Shao, Jian
name: Zhong, Mao
name: Chen, Zheng
name: Ci, Lijie
name: He, Peng
name: Ji, Hongjun
name: Wei, Jun
name: Li, Mingyu
name: Zhao, Weiwei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Highly flexible electromagnetic interference (EMI) shielding material with excellent shielding performance is of great significance to practical applications in next-generation flexible devices. However, most EMI materials suffer from insufficient flexibility and complicated preparation methods. In this study, we propose a new scheme to fabricate a magnetic Ni particle/Ag matrix composite ultrathin film on a paper surface. For a ~2 micro meter thick film on paper, the EMI shielding effectiveness (SE) was found to be 46.2 dB at 8.1 GHz after bending 200,000 times over a radius of ~2 mm. The sheet resistance (Rsq) remained lower than 2.30 Ohm after bending 200,000 times. Contrary to the change in Rsq, the EMI SE of the film generally increased as the weight ratio of Ag to Ni increased, in accordance with the principle that EMI SE is positively related with an increase in electrical conductivity. Desirable EMI shielding ability, ultrahigh flexibility, and simple processing provide this material with excellent application prospects.