cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Configuration entropy and confinement/deconfinement transiton in holographic QCD
Creators: name: Braga, Nelson R. F.
name: Junqueira, Octavio C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the holographic AdS/QCD approach, the confinement/deconfinement transition is associated with the Hawking-Page transition of a thermal anti-de Sitter (AdS) space to an AdS black hole. In the case of the hard wall model, the thermal transition takes place in the planar AdS thanks to the introduction of an infrared cut-off in the geometry. The corresponding thermodynamic entropy of the $SU(N) $ gauge theory jumps from proportional to $N^0$ in the confined hadronic phase to proportional to $N^2$ in the plasma phase, corresponding to the presence of the color degrees of freedom. The Hawking-Page transition is understood by considering a semiclassical picture of a system consisting of two different geometries that are asymptotically AdS. One is the AdS black hole and the other the thermal AdS space. The relative stability between these competing geometries varies with the temperature. So, the transition is essentially a problem of stability. An interesting tool to study stability of physical systems is the configuration entropy (CE), inspired in the Shannon informational entropy. In this work we investigate the CE for the case of the AdS/QCD hard wall model at finite temperature. We propose a regularized form for the energy densities of the black hole (BH) and of the thermal AdS geometries that makes it possible to calculate their CEs as a function of the temperature. We find a relation between stability and the value of the CE for the system of asymptotically AdS geometries. Remarkably, it is found that the CE is proportional to $\log(T)$, where $T$ is the temperature. This result makes it possible to write out a simple relation between the configuration and the thermodynamic entropies.
description: 19 pages, 4 figures. Updated version, accepted for publication in PLB
Characterizations of non-normalized discrete probability distributions and their application in statistics
Creators: name: Betsch, Steffen
name: Ebner, Bruno
name: Nestmann, Franz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: Primary 62E10, Secondary 62G10, 65C05

description: From the distributional characterizations that lie at the heart of Stein's method we derive explicit formulae for the mass functions of discrete probability laws that identify those distributions. These identities are applied to develop tools for the solution of statistical problems. Our characterizations, and hence the applications built on them, do not require any knowledge about normalization constants of the probability laws. To demonstrate that our statistical methods are sound, we provide comparative simulation studies for the testing of fit to the Poisson distribution and for parameter estimation of the negative binomial family when both parameters are unknown. We also consider the problem of parameter estimation for discrete exponential-polynomial models which generally are non-normalized.
description: 24 pages, 3 figures
The geometry of extended null supersymmetry in M-theory
Creators: name: Mac Conamhna, Oisin A. P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For supersymmetric spacetimes in eleven dimensions admitting a null Killing spinor, a set of explicit necessary and sufficient conditions for the existence of any number of arbitrary additional Killing spinors is derived. The necessary and sufficient conditions are comprised of algebraic relationships, linear in the spinorial components, between the spinorial components and their first derivatives, and the components of the spin connection and four-form. The integrability conditions for the Killing spinor equation are also analysed in detail, to determine which components of the field equations are implied by arbitrary additional supersymmetries and the four-form Bianchi identity. This provides a complete formalism for the systematic and exhaustive investigation of all spacetimes with extended null supersymmetry in eleven dimensions. The formalism is employed to show that the general bosonic solution of eleven dimensional supergravity admitting a $G_2$ structure defined by four Killing spinors is either locally the direct product of $\mathbb{R}^{1,3}$ with a seven-manifold of $G_2$ holonomy, or locally the Freund-Rubin direct product of $AdS_4$ with a seven-manifold of weak $G_2$ holonomy. In addition, all supersymmetric spacetimes admitting a $(G_2\ltimes\mathbb{R}^7)\times\mathbb{R}^2$ structure are classified.
description: 36 pages, latex; v2, section classifying all spacetimes admitting a $(G_2\ltimes\mathbb{R}^7)\times\mathbb{R}^2$ structure included; v3, typos corrected. Final version to appear in Phys.Rev.D
Adjustment Policies in Europe
Creators: name: Cahill, Carmel
name: Cahill, Carmel
Publisher: name: Unknown
Year: 2003
Subjects: Agricultural and Food Policy

description: This paper is focussed on a set of policies, some specifically agricultural, others taking the form of special provisions within, or exceptions to, economy wide measures that affect adjustment in the agricultural sector in a selection of European countries. The policies are those that affect entry to and exit from the sector and cover measures affecting both land and labour. These are predominantly taxation and social security measures (including specifically agricultural early retirement schemes), and the plethora of other laws and regulations that control land purchase, lease and conversion. The choice of countries has been determined mainly by the availability of information (France, Germany, Ireland, Norway), but those singled out for detailed treatment are generally those where there is significant intervention with a view to directing the movement of resources in and out of the sector. The paper will describe the measures and will attempt a qualitative assessment of their likely effects in a trade liberalisation or reform context. Before the country sections are embarked on, the paper describes some of the cultural, historical and structural features that are important to understanding the "adjustment" debate in Europe.
Scapania (Pseudomacrodiplophyllum) Vana, Hentschel, Joch. Mull. et Heinrichs, PhytoKeys
Creators: name: Söderström, Lars
name: Hagborg, Anders
name: Konrat, Matt Von
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Plantae
Bryophyta
Jungermanniopsida
Jungermanniales
Scapaniaceae
Scapania

description: Scapania subgen. Pseudomacrodiplophyllum Váňa, Hentschel, Joch.Müll. et Heinrichs,
PhytoKeys 10: 15, 2012 (see Váňa et al. 2012a). TYPE: Scapania microdonta (Mitt.) Müll.Frib.
description: Published as part of Söderström, Lars, Hagborg, Anders & Konrat, Matt Von, 2014, Early Land Plants Today: Index of Liverworts & Hornworts 2011 - 2012, pp. 61-85 in Phytotaxa 170 (2) on page 74, DOI: 10.11646/phytotaxa.170.2.1, http://zenodo.org/record/4779611
Exceptional Dynamical Quantum Phase Transitions in Periodically Driven Systems
Creators: name: Hamazaki, Ryusuke
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Extending notions of phase transitions to nonequilibrium realm is a fundamental problem for statistical mechanics. While it was discovered that critical transitions occur even for transient states before relaxation as the singularity of a dynamical version of free energy, their nature is yet to be elusive. Here, we show that spontaneous symmetry breaking can occur at a short-time regime and causes universal dynamical quantum phase transitions in periodically driven unitary dynamics. Unlike conventional phase transitions, the relevant symmetry is antiunitary: its breaking is accompanied by a many-body exceptional point of a nonunitary operator obtained by space-time duality. Using a stroboscopic Ising model, we demonstrate the existence of distinct phases and unconventional singularity of dynamical free energy, whose signature can be accessed through quasilocal operators. Our results open up research for hitherto unknown phases in short-time regimes, where time serves as another pivotal parameter, with their hidden connection to nonunitary physics.
description: 8 pages, 5 figures (Supplementary Information: 21 pages, 11 figues)
Relationships Between Food Processors and Traders in Hungary
Creators: name: Stauder, Marta
name: Stauder, Marta
Publisher: name: Unknown
Year: 2003
Subjects: subject: Industrial Organization
subject: International Relations/Trade
subject: agricultural and food trade
subject: relationship of producers and traders
subject: supply chain

description: During the past years the market share of trade chains has increased substantially in Hungarian food commerce. The concentration of food commerce and the increasing presence of international and national trade chains can be observed in Hungary as well. It is generally true that small and middle-sized food trading enterprises are not competitive compared to large trade chains. However, this fact does not mean that their reason for existence or their support is questionable. The former system of relations between food commerce and food industry has undergone radical changes due to the expansion of food chains. Due to the changes, requirements towards food industry have grown, food industry has to face fundamentally new mentality and concepts. In conclusion we can state that during the many-year presence of trade chains (multinational and Hungarian) food industry has tried to adapt to the transformed competition conditions even so far, and this process is going on. In addition to the fact that producers have to experience fundamental changes in mentality, economic policy has to provide this progress with the necessary background. A system of subsidies and regulations has to be established with the aim to prevent serious distortions by the expansion of trade chains. Economic policy has numerous known and yet unknown tasks in moderating the vulnerability of small and medium-sized enterprises against increasingly concentrating trade chains of large capital power.
Grain Transportation Policy and Transformation in Western Canadian Agriculture
Creators: name: Doan, Darcie
name: Paddock, Brian
name: Dyer, Jan
name: Doan, Darcie
name: Paddock, Brian
name: Dyer, Jan
Publisher: name: Unknown
Year: 2003
Subjects: subject: Agricultural and Food Policy
subject: transportation policy
subject: diversification
subject: structural change

description: This paper provides an overview of grain transportation policy in Canada over the last 100 years, including the inception of the Crow Rate, the replacement of the Crow Rate with the Western Grain Transportation Act(WGTA), and finally, the repeal of the WGTA. Particular emphasis is placed on the structural change to the western agricultural economy that occurred following repeal of the WGTA in 1995. When grain transportation subsidies were removed, industry responded quickly to market signals through a diversification of crop patterns, an increase in livestock production, and an increase in value-added processing. Key Words: transportation policy, diversification, structural change
Assessing Alternatives for Directional Detection of a WIMP Halo
Creators: name: Copi, Craig J.
name: Krauss, Lawrence M.
name: Simmons-Duffin, David
name: Stroiney, Steven R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The future of direct terrestrial WIMP detection lies on two fronts: new, much larger low background detectors sensitive to energy deposition, and detectors with directional sensitivity. The former can large range of WIMP parameter space using well tested technology while the latter may be necessary if one is to disentangle particle physics parameters from astrophysical halo parameters. Because directional detectors will be quite difficult to construct it is worthwhile exploring in advance generally which experimental features will yield the greatest benefits at the lowest costs. We examine the sensitivity of directional detectors with varying angular tracking resolution with and without the ability to distinguish forward versus backward recoils, and compare these to the sensitivity of a detector where the track is projected onto a two-dimensional plane. The latter detector regardless of where it is placed on the Earth, can be oriented to produce a significantly better discrimination signal than a 3D detector without this capability, and with sensitivity within a factor of 2 of a full 3D tracking detector. Required event rates to distinguish signals from backgrounds for a simple isothermal halo range from the low teens in the best case to many thousands in the worst.
description: 4 pages, including 2 figues and 2 tables, submitted to PRL
Twisted superfluid and supersolid phases of triplons in bilayer honeycomb magnets
Creators: name: Bhowmick, Dhiman
name: Chatterjee, Abhinava
name: Panigrahi, Prasanta K.
name: Sengupta, Pinaki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We demonstrate that low-lying triplon excitations in a bilayer Heisenberg antiferromagnet provide a promising avenue to realize magnetic analogs of twisted superfluid and supersolid phases that were recently reported for two-component ultracold atomic condensate in an optical lattice. Using a cluster Gutzwiller mean-field theory, we establish that Dzyaloshinskii-Moriya interactions (DMI), that are common in many quantum magnets, stabilize these phases in a magnetic system, in contrast to the pair hopping process that is necessary for ultracold atoms. The critical value of DMI for transition to the twisted superfluid and twisted supersolid phases depends on the strength of the (frustrated) interlayer interactions that can be tuned by applying external pressure on and / or shearing force between the layers. Furthermore, we show that the strength of DMI can be controllably varied by coupling to tailored circularly polarized light. Our results provide crucial guidance for the experimental search of twisted superfluid and supersolid phases of triplons in real quantum magnets.
description: 10 pages, 5 figures
Policy Reform in Sub Saharan Africa
Creators: name: Dorward, Andrew
name: Kydd, Jonathan
name: Dorward, Andrew
name: Kydd, Jonathan
Publisher: name: Unknown
Year: 2003
Subjects: Agricultural and Food Policy

description: Agricultural adjustment policies in sub Saharan Africa have not delivered substantial increases in agricultural growth. We examine alternative explanations for this and argue that transitions and thresholds in agricultural growth processes are not sufficiently recognised and understood in dominant policy discourses. This is a particular problem with market failures for goods and services with private good characteristics and we need a greater emphasis on and understanding of the causes and nature of coordination failures which lead to these market failures. This paper examines core features of poor rural areas, the nature of coordination problems faced by different potential economic actors, the impacts of these problems on markets and economic development, and the ways that these have been addressed or ignored in different policies and policy approaches in Asia and Africa in the last 40 years. We conclude by drawing out the implications for policies seeking to promote pro-poor economic growth in poor rural areas today.
Allocation Effects of Policy Reform: A Micro-Simulation of Macro-Model Results for the United States
Creators: name: Hopkins, Jeffrey W.
name: Hanson, Kenneth
name: Somwaru, Agapi
name: Burfisher, Mary E.
name: Hopkins, Jeffrey W.
name: Hanson, Kenneth
name: Somwaru, Agapi
name: Burfisher, Mary E.
Publisher: name: Unknown
Year: 2003
Subjects: subject: Agricultural and Food Policy
subject: income
subject: labor
subject: CGE
subject: micro-simulation

description: By changing marginal prices and therefore production incentives, removal of government payments will result in a re-allocation of factors of production as farm households pursue alternative economic opportunities. At the economy-wide level these impacts are small, but closer inspection reveals that some household-level impacts will be larger and other households will be affected little if at all. The underlying heterogeneity of the agricultural sector results in variable adjustment along two dimensions. First, survey data show that payments are not evenly distributed so their removal does not have a uniform impact across the sector. Second, even if payments were evenly distributed, factor endowments are not, so that ability to enter into alternative enterprises and employment opportunities varies as well. Using micro-data from a national survey of farm households, we simulate the effects predicted by a disaggregated CGE due to removal of government payments. By bringing to the forefront the distributional character of farm and nonfarm labor income, other factor income, and tax payments, our micro-simulation approach can be a valuable tool for understanding the relationship between policy incidence and response, an issue sure to arise in implementing policy reform.
Report on selected indicators
Creators: name: Lionello, Piero
name: Bacciu, Valentina
name: Briche, Elodie
name: Dubois, Ghislain
name: Hernandez, Matias Gonzalez
name: Gaertner, Miguel Angel
name: Ruiz Valdepenas
name: Lora, Veronica
name: Hoevenaars, Kyra
name: Galindo, Carmen Garcia
name: Suarez, Salvador
name: Freitas, Ricardo Meneses
Publisher: name: Zenodo
Year: 2020
Subjects: indicators, adaptive capacity, exposure, sensitivity, hazard

description: In this report a set of indicators is proposed for summarizing objectives and providing up-to-date information on the impacts of climate change, the state-of-the-environment and societal conditions of islands. These indicators are meant to support a practical description. They can be used for identifying policy goals, defining strategies, monitoring and evaluating implemented actions. They are also useful for communicating the environmental and societal conditions to a particular audience, such as local stakeholders, administrations, general public, policymakers from local to national levels. Finally, they provide a synthetic way to describe multiple aspects of the state of environment, natural resources assets and related human activities including socio-economic factors. These indicators are based on environmental data, models, oceanographic and meteorological observations, and administrative archives. They are based on several parameters including physical, chemical or biological measures associated with environmental quality or natural resources, information on processes and interventions, economical values, members describing the composition and characteristics of societies and of their needs. The indicators are focused on the four sectors addressed by SOCLIMPACT and strictly linked to the identified impact chains. They allow:  To compare conditions among islands  To identify critical situations  To identify trends and evolution of conditions leading to risks  To monitor risks  To monitor the results of management strategies
description: Deliverable 3.3.
Satbility of Ternary Homomorphisms via Generalized Jensen Equation
Creators: name: Moslehian, Mohammad Sal
name: Szekelyhidi, Laszlo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 39B82, Secondary 39B52, 46L05

description: In this paper, we establish the generalized Hyers--Ulam--Rassias stability of homomorphisms between ternary algebras associted to the generalized Jensen functional equation $r f(\frac{sx+ty}{r}) = s f(x) + t f(y)$.
description: 12 pages
Scapania (sect. Simmonsia) Vana, Hentschel, Joch. Mull. et Heinrichs, PhytoKeys
Creators: name: Söderström, Lars
name: Hagborg, Anders
name: Konrat, Matt Von
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Plantae
Bryophyta
Jungermanniopsida
Jungermanniales
Scapaniaceae
Scapania

description: Scapania sect. Simmonsia (R.M.Schust.) Váňa, Hentschel, Joch.Müll. et Heinrichs,
PhytoKeys 10: 16, 2012 (see Váňa et al. 2012a). BASIONYM: Scapania subsect. Simmonsia R.M.Schust., Hepat. Anthocerotae N. Amer. 3: 612, 1974 (see Schuster 1974).
NOTE: Originally placed under subgen. Scapania.
description: Published as part of Söderström, Lars, Hagborg, Anders & Konrat, Matt Von, 2014, Early Land Plants Today: Index of Liverworts & Hornworts 2011 - 2012, pp. 61-85 in Phytotaxa 170 (2) on page 74, DOI: 10.11646/phytotaxa.170.2.1, http://zenodo.org/record/4779611
DYNAMIC ECONOMIC ANALYSIS OF A RESIDUE MANAGEMENT SYSTEM IN COTTON
Creators: name: Paudel, Krishna P.
name: Lohr, Luanne
name: Paudel, Krishna P.
name: Lohr, Luanne
Publisher: name: Unknown
Year: 1998
Subjects: subject: Crop Production/Industries
subject: residue management
subject: organic matter
subject: productivity

description: Residue management system (RMS), comprised of no till cultivation, a winter cover crop, and poultry litter, could be an alternative to existing management system in cotton production in the Georgian Piedmont. We compare the productivity and profitability of RMS with the current system over time, focusing on the role of organic matter. Using dynamic bioeconomic modelling technique, we show that the net return and land value difference between these two systems increase as the terminal period increases. We conclude that if financial and capital markets based on organic matter work efficiently, farmers will choose RMS in cotton production.
OUTDOOR RECREATION TRENDS AND MARKET OPPORTUNITIES IN THE UNITED STATES
Creators: name: Cordell, H. Ken
name: McDonald, Barbara L.
name: Briggs, J. Alden
name: Teasley, R. Jeff
name: Biesterfeldt, Robert
name: Bergstrom, John C.
name: Mou, Shela H.
name: Cordell, H. Ken
name: McDonald, Barbara L.
name: Briggs, J. Alden
name: Teasley, R. Jeff
name: Biesterfeldt, Robert
name: Bergstrom, John C.
name: Mou, Shela H.
Publisher: name: Unknown
Year: 1997
Subjects: Resource /Energy Economics and Policy

description: In 1994 and 1995, the National Survey of Recreation and Environment (NSRE) was accomplished by interviewing approximately 17,000 Americans over age 15 in random-digit-dialing telephone samplings. The primary purpose was to learn about the outdoor recreation activities of people over age 15 in the United States. They were asked about their participation in 62 specific recreation activities.
Reciprocal Maximum Likelihood Degrees of Brownian Motion Tree Models
Creators: name: Boege, Tobias
name: Coons, Jane Ivy
name: Eur, Christopher
name: Maraj, Aida
name: Röttger, Frank
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistics Theory (math.ST)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 62R01, 14M25, 62F10

description: We give an explicit formula for the reciprocal maximum likelihood degree of Brownian motion tree models. To achieve this, we connect them to certain toric (or log-linear) models, and express the Brownian motion tree model of an arbitrary tree as a toric fiber product of star tree models.
description: 16 pages, 2 figures; v2: minor revision
การจัดหลักสูตรการสอนภาษาไทยในฐานะภาษาต่างประเทศ
Creators: name: นวลทิพย์ เพิ่มเกษร
Publisher: name: คณะศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์
Year: 2009
Subjects: -

description: วรรณวิทัศน์, 9, พฤศจิกายน, 107-120
Big Bang Nucleosynthesis with an Evolving Radion in the Brane World Scenario
Creators: name: Li, Baojiu
name: Chu, Ming-Chung
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the big bang nucleosynthesis (BBN) in the Brane world scenario, where all matter fields are confined on our 3-brane and the radion of the Brane evolves cosmologically. In the Einstein frame fundamental fermion masses vary and the results of standard BBN (SBBN) are modified. We can thus use the observational primordial element abundances to impose constraints on the possible variations of the radion. The possibility of using the evolving radion to resolve the discrepancies between the Wilkinson Microwave Anisotropy Probe (WMAP) and SBBN values of the baryon-to-photon ratio ($η$) is also discussed. The results and constraints presented here are applicable to other models in which fundamental fermion masses vary.
description: 10 pages, 5 figures; Comments and references added; Version accepted for publication in Physical Review D
Effects of current on vortex and transverse domain walls
Creators: name: He, J.
name: Li, Z.
name: Zhang, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: By using the spin torque model in ferromagnets, we compare the response of vortex and transverse walls to the electrical current. For a defect-free sample and a small applied current, the steady state wall mobility is independent of the wall structure. In the presence of defects, the minimum current required to overcome the wall pinning potential is much smaller for the vortex wall than for the transverse wall. During the wall motion, the vortex wall tends to transform to the transverse wall. We construct a phase diagram for the wall mobility and the wall transformation driven by the current.
A NEW GENERATION PEANUT COOPERATIVE IN GEORGIA: A BENEFIT-COST ANALYSIS
Creators: name: Hancock, Samuel J.
name: Ray, Todd S.
name: Fletcher, Stanley M.
name: Thomas, William A.
name: Hancock, Samuel J.
name: Ray, Todd S.
name: Fletcher, Stanley M.
name: Thomas, William A.
Publisher: name: Unknown
Year: 2001
Subjects: Agribusiness
Crop Production/Industries

description: A survey of Georgia peanut producers revealed that the Southwest corner of Georgia could be targeted for a new generation peanut cooperative (FS 01-07). The objective of this study was to examine the feasibility of this option. Preliminary results revealed that this might be an economically feasible solution to peanut producers' marketing problems. The projected discounted benefit-cost ratios ranged from 1.9 to 1.4 over a ten-year period.
Kondo effect in triple quantum dots
Creators: name: Zitko, R.
name: Bonca, J.
name: Ramsak, A.
name: Rejec, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Numerical analysis of the simplest odd-numbered system of coupled quantum dots reveals an interplay between magnetic ordering, charge fluctuations and the tendency of itinerant electrons in the leads to screen magnetic moments. The transition from local-moment to molecular-orbital behavior is visible in the evolution of correlation functions as the inter-dot coupling is increased. Resulting novel Kondo phases are presented in a phase diagram which can be sampled by measuring the zero-bias conductance. We discuss the origin of the even-odd effects by comparing with the double quantum dot.
description: 4 pages, 4 figures
COMPETITIVE BEHAVIOR IN THE FOOD RETAILING INDUSTRY
Creators: name: Park, Timothy A.
name: Weliwita, Ananda
name: Park, Timothy A.
name: Weliwita, Ananda
Publisher: name: Unknown
Year: 1996
Subjects: subject: Agribusiness
subject: Industrial Organization
subject: market power
subject: food retailing
subject: Box-Cox model
subject: technological innovations

description: We develop a flexible model to examine competitive conditions in the food retailing industry based on the Box-Cox transformation of the demand and industry equilibrium conditions. The impact of key technological and market developments on shifts in the competitive index is examined. Adoption of optical scanning technology was positively related to the market power index but the index was stable and consistent with competitive conditions over the 1982-1992 period.
Heavy atom tunneling in chemical reactions: study of H + LiF collisions
Creators: name: Weck, P. F.
name: Balakrishnan, N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The H+LiF(X 1Sigma+,v=0-2,j=0)-->HF(X 1Sigma+,v',j')+Li(2S) bimolecular process is investigated by means of quantum scattering calculations on the chemically accurate X 2A' LiHF potential energy surface of Aguado et al. [J. Chem. Phys. 119, 10088 (2003)]. Calculations have been performed for zero total angular momentum for translational energies from 10-7 to 10-1 eV. Initial-state selected reaction probabilities and cross sections are characterized by resonances originating from the decay of metastable states of the H...F-Li and Li...F-H van der Waals complexes. Extensive assignment of the resonances has been carried out by performing quasibound states calculations in the entrance and exit channel wells. Chemical reactivity is found to be significantly enhanced by vibrational excitation at low temperatures, although reactivity appears much less favorable than non-reactive processes due to the inefficient tunneling of the relatively heavy fluorine atom strongly bound in van der Waals complexes.
description: 19 pages, 5 figures, 1 table; submitted to J. Chem. Phys
On Local and Integrated Stress-Tensor Commutators
Creators: name: Besken, Mert
name: de Boer, Jan
name: Mathys, Grégoire
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss some general aspects of commutators of local operators in Lorentzian CFTs, which can be obtained from a suitable analytic continuation of the Euclidean operator product expansion (OPE). Commutators only make sense as distributions, and care has to be taken to extract the right distribution from the OPE. We provide explicit computations in two and four-dimensional CFTs, focusing mainly on commutators of components of the stress-tensor. We rederive several familiar results, such as the canonical commutation relations of free field theory, the local form of the Poincaré algebra, and the Virasoro algebra of two-dimensional CFT. We then consider commutators of light-ray operators built from the stress-tensor. Using simplifying features of the light sheet limit in four-dimensional CFT we provide a direct computation of the BMS algebra formed by a specific set of light-ray operators in theories with no light scalar conformal primaries. In four-dimensional CFT we define a new infinite set of light-ray operators constructed from the stress-tensor, which all have well-defined matrix elements. These are a direct generalization of the two-dimensional Virasoro light-ray operators that are obtained from a conformal embedding of Minkowski space in the Lorentzian cylinder. They obey Hermiticity conditions similar to their two-dimensional analogues, and also share the property that a semi-infinite subset annihilates the vacuum.
description: 43 pages. v3: published version, added discussion on light scalars (thanks to referee)
Warped Reheating in Multi-Throat Brane Inflation
Creators: name: Chialva, Diego
name: Shiu, Gary
name: Underwood, Bret
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate in some quantitative details the viability of reheating in multi-throat brane inflationary scenarios by estimating and comparing the time scales for the various processes involved. We also calculate within perturbative string theory the decay rate of excited closed strings into KK modes and compare with that of their decay into gravitons; we find that in the inflationary throat the former is preferred. We also find that over a small but reasonable range of parameters of the background geometry, these KK modes will preferably tunnel to another throat (possibly containing the Standard Model) instead of decaying to gravitons due largely to their suppressed coupling to the bulk gravitons. Once tunneled, the same suppressed coupling to the gravitons again allows them to reheat the Standard Model efficiently. We also consider the effects of adding more throats to the system and find that for extra throats with small warping, reheating still seems viable.
description: 29 pages, 4 figures, discussions on closed string decay expanded, references added
ข้อคิดจากการเปลี่ยนแปลงการใช้ภาษาไทยปัจจุบัน
Creators: name: ปองจิต อ่อนเผ่า
Publisher: name: คณะศิลปศาสตร์ มหาวิทยาลัยธรรมศาสตร์
Year: 2009
Subjects: -

description: วรรณวิทัศน์, 9, พฤศจิกายน, 121-133
[Brev til DKNVS]
Creators: name: Qvigstad
name: Det Kongelige Norske Videnskabers Selskab (DKNVS)
Publisher: name: Unknown
Year: 1815

description: Liste over noen som er kurert for sykdom. Også undertegnet Erik Ingebrigtsen Skarsem og Ingebrigt Hokker. Oppdal
Vanishing nematic order beyond the pseudogap phase in overdoped cuprate superconductors
Creators: name: Gupta, Naman K.
name: McMahon, C.
name: Sutarto, R.
name: Shi, T.
name: Gong, R.
name: Wei, Haofei I.
name: Shen, K. M.
name: He, F.
name: Ma, Q.
name: Dragomir, M.
name: Gaulin, B. D.
name: Hawthorn, D. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: During the last decade, translational and rotational symmetry-breaking phases -- density wave order and electronic nematicity -- have been established as generic and distinct features of many correlated electron systems, including pnictide and cuprate superconductors. However, in cuprates, the relationship between these electronic symmetry-breaking phases and the enigmatic pseudogap phase remains unclear. Here, we employ resonant x-ray scattering in a cuprate high-temperature superconductor La$_{1.6-x}$Nd$_{0.4}$Sr$_{x}$CuO$_{4}$ (Nd-LSCO) to navigate the cuprate phase diagram, probing the relationship between electronic nematicity of the Cu 3$d$ orbitals, charge order, and the pseudogap phase as a function of doping. We find evidence for a considerable decrease in electronic nematicity beyond the pseudogap phase, either by raising the temperature through the pseudogap onset temperature $T^{*}$ or increasing doping through the pseudogap critical point, $p^{*}$. These results establish a clear link between electronic nematicity, the pseudogap, and its associated quantum criticality in overdoped cuprates. Our findings anticipate that electronic nematicity may play a larger role in understanding the cuprate phase diagram than previously recognized, possibly having a crucial role in the phenomenology of the pseudogap phase.
description: 30 pages, 9 figures, Main text and Supplementary material
Limits and fluctuations of $p$-adic random matrix products
Creators: name: Van Peski, Roger
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We show that singular numbers (also known as invariant factors or Smith normal forms) of products and corners of random matrices over $\mathbb{Q}_p$ are governed by the Hall-Littlewood polynomials, in a structurally identical manner to the classical relations between singular values of complex random matrices and Heckman-Opdam hypergeometric functions. This implies that the singular numbers of a product of corners of Haar-distributed elements of $\text{GL}_N(\mathbb{Z}_p)$ form a discrete-time Markov chain distributed as a Hall-Littlewood process, with the number of matrices in the product playing the role of time. We give an exact sampling algorithm for the Hall-Littlewood processes which arise by relating them to an interacting particle system similar to PushTASEP. By analyzing the asymptotic behavior of this particle system, we show that the singular numbers of such products obey a law of large numbers and their fluctuations converge dynamically to independent Brownian motions. In the limit of large matrix size, we also show that the analogues of the Lyapunov exponents for matrix products have universal limits within this class of $\text{GL}_N(\mathbb{Z}_p)$ corners.
description: 48 pages. v2: several typos fixed and references added. Final version, appears (up to formatting differences) in Selecta Mathematica
Resistance of tele-service workers : implications for qualitative policy research
Creators: name: Koch-Schulte, Sarah Ann
Publisher: name: University of British Columbia
Year: 2009

description: This thesis investigates how resistance can be analyzed in qualitative policy research. My working definition here for resistance is: the interruption of rituals and performances of power. By qualitative policy research, I refer to methods of gathering stories from people for public policy development derived from ethnographic techniques in anthropology. Qualitative techniques generally prioritize the micro-analysis of particular situations in developing macro-policies. The problem here concerns a persistent focus in qualitative policy writing upon constraints and problems. This study engages issues of agency and human ingenuity through a resistance analysis. This thesis research addresses resistance tactics employed by thirty-nine tele-service agents in Canada, interviewed in summer 1998 in Fredericton, Moncton, St. John, Toronto, and Winnipeg. The call centre industry is an excellent case study of the modern service sector as it exists at the intersection of economic and technological change in a highly gendered environment. Two thirds of call centre telephone agents are women. Key informant interviews have been analyzed with Non-numerical Unstructured Data Indexing Searching and Theorizing (QSR NUD*IST 4) qualitative data software using a typology developed from Political Scientist James C. Scott. This reading of Scott applies his descriptions of resistance in five areas of analysis: grumbling and complaining, quitting and missing work, bodily appearances, unions, and technology and sabotage. Diffuse ideas of power from postmodern social theory are used to further understand the significance of non-collective resistances in this sector. Three significant findings are available from this study. First, narratives of telephone agents suggest that significant acts of resistance occur on a non-collective basis. Second, qualitative policy research creates opportunities to interrupt generalizations about service work; however, knowledge created by qualitative research remains embedded in the politics of the researchers and institutions where the research is produced. Qualitative policy research should be read accordingly. Third, if the call centre sector is profoundly shaped by worker resistance, it is worthwhile for professional economic development planners to consider these acts in policy development.
Principle of Multiple Point Criticality in Multi-Scalar Dark Matter Models
Creators: name: Kannike, Kristjan
name: Koivunen, Niko
name: Raidal, Martti
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The principle of multiple point criticality (PMPC), which allowed the prediction of the Higgs boson mass before its discovery, has so far been applied to radiatively generated vacua. If this principle is fundamental, following from some presently unknown underlying physics, the PMPC must apply to all vacua, including the multiple vacua of multi-scalar models dominated by tree-level terms. We first motivate this idea and then exemplify it by applying the PMPC to various realizations of singlet scalar dark matter models. We derive constraints on the dark matter properties from the requirement of degenerate vacua and show that some scalar dark matter models are ruled out by the PMPC, while in others the allowed parameters space is constrained.
description: Published version
THE U.S. MEXICAN WINTER MARKET TRADE DISPUTE
Creators: name: Gunter, Lewell F.
name: Ames, Glenn C.W.
name: Gunter, Lewell F.
name: Ames, Glenn C.W.
Publisher: name: Unknown
Year: 1997
Subjects: International Relations/Trade

description: On March 11, 1996, the Florida Fruit and Vegetable Association, the Florida Bell Pepper Growers Exchange, the Florida Farm Bureau, the Florida Department of Agriculture and Consumer Services and other U.S. tomato producers filed a petition with the International Trade Commission (ITC) for economic relief from the effects of increased tomato imports from Mexico under Section 202 (a) of the Trade Act of 1974. A second petition was filed with the U.S. Department of Commerce under Section 733 (a) of the U.S. Tariff Act of 1930, charging that Mexican tomatoes were being dumped on the U.S. market at prices less than fair market value (LTFV) and were the cause of material injury to the domestic industry. Florida growers blame their recent loss of market share and depressed prices during the 1995-96 winter season on NAFTA, the North American Free Trade Agreement. The reduction in trade barriers due to NAFTA allegedly resulted in a flood of Mexican tomato imports, which have depressed domestic prices and resulted in declining profits, employment and investments. These allegations constitute the legal criteria for a petition seeking economic relief from imports sold at less than fair market value. The ITC investigated the first petition and rejected it on July 2, 1996. The antidumping petition continued during the summer and fall, 1996, until trade negotiations resulted in a compromise agreement that suspended the investigation. On October 11, 1996, the U.S. and Mexican tomato growers reached an agreement suspending the dumping case and establishing a minimum import price for fresh tomatoes at $0.2068 per pound ($0.45/kg) or $5.17 per 25-pound box. The price floor appeared low enough to allow for competitive improvements and disposal of temporary oversupplies in the market. Thus the wholesale price of tomatoes from the two regions would be approximately equivalent, restoring a "level playing field."
Evolution of Field Dwarf Galaxies with GEMS
Creators: name: Barazza, Fabio D.
name: Jogee, Shardha
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the evolution of late-type field dwarfs over the last ~ 1.9 Gyr, based on HST ACS observations carried out as part of the GEMS survey. This study is amongst the first to probe the evolution of dwarfs over such a large timescale. The comparison of structural properties, particularly size and scale length, indicates that the dwarfs in the redshift range z ~ 0.01 to 0.15 (look-back times up to 1.9 Gyr) are more extended than local dwarfs. We argue that this difference is due to the star formation activity becoming more centrally concentrated in late-type dwarfs over the last ~ 1.9 Gyr. We discuss several possible causes for this evolution. We also find a lack of blue compact dwarfs in the GEMS sample and interpret this as indicative of the fact that strong, centrally concentrated star formation is a feature of evolved dwarfs that are entering their final stages of evolution.
description: 4 pages, to appear in the proceedings of IAUC198: Near-Field Cosmology with Dwarf Elliptical Galaxies, Helmut Jerjen and Bruno Binggeli, eds
LABOR PRODUCTIVITY WITHIN THE AFRICAN AGRICULTURAL HOUSEHOLD: THE HOUSEHOLD PRODUCTION MODEL REVISITED
Creators: name: Elad, Renata L.
name: Houston, Jack E.
name: Keeler, Andrew G.
name: Baker, Doyle Curtis
name: Elad, Renata L.
name: Houston, Jack E.
name: Keeler, Andrew G.
name: Baker, Doyle Curtis
Publisher: name: Unknown
Year: 1998
Subjects: subject: Consumer/Household Economics
subject: Labor and Human Capital
subject: agriculture
subject: labor productivity
subject: gender
subject: production
subject: consumption

description: The benchmark concept is used to understand changes in farm household response to development dynamics. 1996-97 cropping seasons data from Cameroon is used to develop and test a "separate spheres" household model. Labor productivity for men and women is discussed, along with their implications for research and resource management policies.
Scapania magadanica S. S. Choi, Bakalin et B. Y. Sun, Bot. Pacifica
Creators: name: Söderström, Lars
name: Hagborg, Anders
name: Konrat, Matt Von
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Plantae
Bryophyta
Jungermanniopsida
Jungermanniales
Scapaniaceae
Scapania
Scapania magadanica

description: Scapania magadanica S.S.Choi, Bakalin et B.Y.Sun,
Bot. Pacifica 1: 46, 2012 (see Choi et al. 2012).
TYPE: “ Holotypus: Russia, Magadan Province, Magadan city area, Marchekanskaya Mt. (N 59°30′49″E 150°49′51″E), 621 m alt. Shaded rocks in stony field near Pinus pumila crooked forest. Leg. 15 Aug. 2011 S.S. Choi and V. Bakalin R6581 (holotypus in JNU, isotypus in VLA)”.
description: Published as part of Söderström, Lars, Hagborg, Anders & Konrat, Matt Von, 2014, Early Land Plants Today: Index of Liverworts & Hornworts 2011 - 2012, pp. 61-85 in Phytotaxa 170 (2) on page 74, DOI: 10.11646/phytotaxa.170.2.1, http://zenodo.org/record/4779611
Bit thread, entanglement distillation, and entanglement of purification
Creators: name: Lin, Yi-Yu
name: Sun, Jia-Rui
name: Sun, Yuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the relations between bit thread, entanglement distillation and entanglement of purification in the holographic framework. Specifically, we give a bit thread interpretation for the one-shot entanglement distillation (OSED) tensor network, which can be understood as reconstructing the geometric structure of the bulk spacetime from the entanglement information of the boundary quantum system through the "surface growth scheme". Moreover, by showing that the holographic entanglement of purification (EoP) process can be regarded as a special case of our "surface growth scheme", we naturally obtain the bit thread interpretation of the holographic EoP in our framework, which turns out to be different from the existing interpretations. Since our interpretation for holographic EoP is obtained in a more general and physical framework, the advantage of our version is that it is more natural, and possibly more reasonable to reflect the real physical entanglement structures.
description: 28 pages,10 figures
Blow-up of radial solutions for the intercritical inhomogeneous NLS equation
Creators: name: Cardoso, Mykael
name: Farah, Luiz Gustavo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the inhomogeneous nonlinear Schrödinger (INLS) equation in $\mathbb{R}^N$ $$i \partial_t u +Δu +|x|^{-b} |u|^{2σ}u = 0,$$ where $N\geq 3$, $00$, then $\limsup_{t\rightarrow T^{\ast}}\|u(t)\|_{\dot H^{s_c}}=+\infty$. Moreover, under an additional assumption and recalling that $\dot{H}^{s_c} \subset L^{σ_c}$ with $σ_c=\frac{2Nσ}{2-b}$, we can in fact deduce, for some $γ=γ(N,σ,b)>0$, the following lower bound for the blow-up rate $$c\|u(t)\|_{\dot H^{s_c}}\geq \|u(t)\|_{L^{σ_c}}\geq |\log (T-t)|^γ,\,\,\,\mbox{ as }\,\,\,t\rightarrow T^{\ast}.$$ The proof is based on the ideas introduced for the $L^2$ super critical nonlinear Schrödinger equation in the work of Merle and Raphaël [13] and here we extend their results to the INLS setting.