cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
DEVELOPMENT PATHWAYS AND LAND MANAGEMENT IN UGANDA: CAUSES AND IMPLICATIONS
Creators: name: Pender, John L.
name: Jagger, Pamela
name: Nkonya, Ephraim M.
name: Sserunkuuma, Dick
name: Pender, John L.
name: Jagger, Pamela
name: Nkonya, Ephraim M.
name: Sserunkuuma, Dick
Publisher: name: Unknown
Year: 2002
Subjects: International Development
Land Economics/Use

description: This paper investigates the patterns and determinants of change in livelihood strategies ("development pathways"), land management practices, resource and human welfare conditions in Uganda since 1990, based upon a community-level survey conducted in 107 villages. The pattern of agricultural development since 1990 involved increasing specialization and commercialization of economic activities, consistent with local comparative advantages and market liberalization. Six dominant development pathways emerged, all but one of which involved increasing specialization in already dominant activities: expansion of cereal production, expansion of banana and coffee production, non-farm development, expansion of horticultural production, expansion of cotton, and stable coffee production. Of these, expansion of banana and coffee production was most strongly associated with adoption of resource-conserving practices and improvements in resource conditions and welfare. Other strategies are needed for areas not suited for this pathway. Other factors also influenced land management and resource and welfare outcomes. Road development was associated with improvements in many welfare and some natural resource conditions, except forest and wetland availability. Irrigation was found to reduce pressure to expand cultivated area at the expense of forest and wetlands, and is associated with improvement in some welfare and resource indicators. Government and non-governmental organization programs were found to contribute to improvements in several resource and welfare indicators, though there were some mixed results. Such programs may cause declines in one area by focusing on improvements in another area. Thus, trade-offs appear to be inherent in many efforts to improve agriculture or protect resources. Population growth had an insignificant impact on most indicators of change, though there is some evidence of population-induced agricultural intensification. The findings support neither the pessimism of some neo-Malthusian observers or the optimism of some neo-Boserupian observers regarding the impacts of population growth.
CONSOLIDATION IN THE FRESH FLORIDA GRAPEFRUIT PACKING INDUSTRY
Creators: name: Davis, Kathy J.
name: Thornsbury, Suzanne
name: Ward, Ronald W.
name: Davis, Kathy J.
name: Thornsbury, Suzanne
name: Ward, Ronald W.
Publisher: name: Unknown
Year: 2002
Subjects: Industrial Organization

description: First-order, homogeneous, stationary Markov models are used to compare patterns of adjustment among Florida fresh grapefruit packers between the 1970/71-1983/84 and 1987/88-1999/00 periods, and 1970/71-1994/95 and 1995/95-1999/00 periods, respectively. Despite sweeping aggregate trends impacting fresh produce markets, there was insufficient evidence to identify significant differences in the patterns of adjustment in the packing sector during the later time periods. Comparisons with actual firm numbers are indicative of an industry near equilibrium. While individual firms enter and exit the different states, currently there are no profound structural changes pointing to major concentration.
A GENERAL EQUILIBRIUM ANALYSIS OF JAPANESE RICE MARKET TRADE LIBERALIZATION
Creators: name: Taniguchi, Kiyoshi
name: Taniguchi, Kiyoshi
Publisher: name: Unknown
Year: 2001
Subjects: International Relations/Trade

description: The main interest of this study is to simulate the domestic rice market under full trade liberalization. Results show that full trade liberalization is welfare enhancing for non-farm as well as farm households, primarily through lower consumer prices. These simulation results apparently undermine the government's argument against trade liberalization.
Dynamic Water Regulation Under Endogenous Irrigation Investment and Production Uncertainty
Creators: name: Zhang, Jiangfeng
name: Zhang, Jiangfeng
Publisher: name: Unknown
Year: 2001
Subjects: Resource /Energy Economics and Policy

description: We study the problem of regulating California agriculture water use. Regulatory decisions are conditioned on current information as well as the anticipation of future learning. Endogenous learning, either about damages from waterlogging or about abatement costs, affects the optimal control today. These regulations affect farmers' water usage and their incentives to adopt new irrigation technology.
Dynamical virial masses of Lyman-break galaxy haloes at z=3
Creators: name: Weatherley, Stephen J.
name: Warren, Stephen J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We improve on our earlier dynamical estimate of the virial masses of the haloes of Lyman-break galaxies (LBGs) at redshift z=3 by accounting for the effects of seeing, slit width, and observational uncertainties. From an analysis of the small number of available rotation curves for LBGs we determine a relation Vc7=(1.9+/-0.2)sigma between circular velocity at a radius of 7kpc, and central line velocity width. We use this relation to transform the measured velocity widths of 32 LBGs to the distribution of circular velocities, for the population of LBGs brighter than R=25.5. We compare this distribution against the predicted distribution for the 'massive-halo' model in which LBGs pinpoint all of the highest mass dark matter haloes at that epoch. The observed LBG circular velocities are smaller than the predicted circular velocities by a factor >1.4+/-0.15. This is a lower limit as we have ignored any increase of circular velocity caused by baryonic dissipation. The massive-halo model predicts a median halo virial mass of 10^12.3 Msol, and a small spread of circular velocities. Our median estimated dynamical mass is <10^(11.6+/-0.3) Msol, which is significantly smaller; furthermore, the spread of our circular velocities is much larger than the massive-halo prediction. These results are consistent with a picture which leaves some of the most-massive haloes available for occupation by other populations which do not meet the LBG selection criteria. The median halo mass recently estimated by Adelberger et al. from the measured clustering of LBGs is 10^(11.86+/-0.3) Msol. Our dynamical analysis appears to favour lower masses and to be more in line with the median mass predicted by the collisional starburst model of Somerville et al., of 10^11.3 Msol. [abridged]
description: 6 pages, 5 figures, MNRAS Letters, Accepted
Drifting inwards in protoplanetary discs I Sticking of chondritic dust at increasing temperatures
Creators: name: Bogdan, T.
name: Pillich, C.
name: Landers, J.
name: Wende, H.
name: Wurm, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Sticking properties rule the early phases of pebble growth in protoplanetary discs in which grains regularly travel from cold, water-rich regions to the warm inner part. This drift affects composition, grain size, morphology, and water content as grains experience ever higher temperatures. In this study we tempered chondritic dust under vacuum up to 1400 K. Afterwards, we measured the splitting tensile strength of millimetre-sized dust aggregates. The deduced effective surface energy starts out as $γ_e = 0.07\,\rm J/m^2$. This value is dominated by abundant iron-oxides as measured by Mössbauer spectroscopy. Up to 1250 K, $γ_e$ continuously decreases by up to a factor five. Olivines dominate at higher temperature. Beyond 1300 K dust grains significantly grow in size. The $γ_e$ no longer decreases but the large grain size restricts the capability of growing aggregates. Beyond 1400 K aggregation is no longer possible. Overall, under the conditions probed, the stability of dust pebbles would decrease towards the star. In view of a minimum aggregate size required to trigger drag instabilities it becomes increasingly harder to seed planetesimal formation closer to a star.
Equation-free Dynamic Renormalization of a KPZ-type Equation
Creators: name: Kessler, David A.
name: Kevrekidis, Ioannis G.
name: Chen, Ligang
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In the context of equation-free computation, we devise and implement a procedure for using short-time direct simulations of a KPZ type equation to calculate the self-similar solution for its ensemble averaged correlation function. The method involves "lifting" from candidate pair-correlation functions to consistent realization ensembles, short bursts of KPZ-type evolution, and appropriate rescaling of the resulting averaged pair correlation functions. Both the self-similar shapes and their similarity exponents are obtained at a computational cost significantly reduced to that required to reach saturation in such systems.
Investigation of spin-$0$ massive charged particle subject to a homogeneous magnetic field with potentials in a topologically trivial flat class of Gödel-type space-time
Creators: name: Ahmed, Faizuddin
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we investigate relativistic quantum dynamics of spin- $0$ massive charged particle subject to a homogeneous magnetic field in the Gödel-type space-time with potentials. We solve the Klein-Gordon equation subject to a homogeneous magnetic field in a topologically trivial flat class of Gödel-type space-time in the presence of a Cornell-type scalar and Coulomb-type vector potentials and analyze the effects on the energy eigenvalues and eigenfunctions.
description: 22 pages, accepted for publication in Adv. High Energy Physics journal
Smectic Liquid Crystals: Materials with One-Dimensional, Periodic Order
Creators: name: Kamien, Randall D.
name: Santangelo, Christian D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Smectic liquid crystals are materials formed by stacking deformable, fluid layers. Though smectics prefer to have flat, uniformly-spaced layers, boundary conditions can impose curvature on the layers. Since the layer spacing and curvature are intertwined, the problem of finding minimal configurations for the layers becomes highly nontrivial. We discuss various topological and geometrical aspects of these materials and present recent progress on finding some exact layer configurations. We also exhibit connections to the study of certain embedded minimal surfaces and briefly summarize some important open problems.
description: 16 pages
A TECHNICAL EFFICIENCY ANALYSIS OF PENNSYLVANIA DAIRY FARMS
Creators: name: Wang, Qiuyan
name: Wang, Qiuyan
Publisher: name: Unknown
Year: 2001
Subjects: Livestock Production/Industries

description: This study estimates technical efficiency (TE) using a stochastic production frontier based on a randomly selected cross-sectional sample of Pennsylvania dairy farms. The Cobb-Douglas functional form is a suitable model in the estimation. Estimates of mean technical efficiency and appropriate technical efficiency of individual farms are computed and compared under three distributional assumptions of the efficiency disturbance terms. Maximum likelihood techniques are used for the estimation of the stochastic frontier. The technical efficiency measure is further broken down by different farm size.
PRODUCTION IMPACT OF LABOR OUTMIGRATION ON AGRARIAN ECONOMIES: THE CASE OF CORN FARMERS IN CENTRAL AND SOUTHERN AREAS IN MEXICO
Creators: name: Ortega-Sanchez, Ismael R.
name: Findeis, Jill L.
name: Ortega-Sanchez, Ismael R.
name: Findeis, Jill L.
Publisher: name: Unknown
Year: 2001
Subjects: Labor and Human Capital

description: Farm productivity in agrarian economies is frequently and considerably altered by the outmigration of household labor. Using household survey data we examine labor outmigration impact on corn farmers of the central and south regions of Mexico. Specifically, comparative changes in labor productivity are estimated in a sequential production technology specification with nonlinear components in the context of different agricultural environments.
A possibility of CPT violation in the Standard Model
Creators: name: Larin, S. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It is shown that there is a possibility of violation of CPT symmetry in the Standard Model which does not contradict to the famous CPT theorem. To check this possibility experimentally it is necessary to increase the precision of measurements of the proton and antiproton mass difference by an order of magnitude
description: 11 pages
Beziehungen zwischen dem ökumenischen Rat der Kirchen und der Kirche der Siebenten-Tags-Adventisten
Creators: name: Handspicker, M. B.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 17 Nr. 1 (1968): Ökumenische Rundschau, Band 17, Heft 1
Underpinnings for Prospective, Net Revenue Forecasting in Hog Finishing: Characterizing the Joint Distribution of Corn, Soybean Meal and Lean Hogs Time Series
Creators: name: Shao, Renyuan
name: Roe, Brian E.
name: Shao, Renyuan
name: Roe, Brian E.
Publisher: name: Unknown
Year: 2001
Subjects: Agricultural Finance
Livestock Production/Industries

description: This research focuses on developing a biannual net revenue forecasting model for hog producers based on Monte Carlo simulation of the joint distribution of hog, corn and soybean meal price series. The relative forecasting power of historical volatility, implied volatility and GARCH-based volatility is examined. Consistent with recent research, the performance of these three methods is both commodity and horizon specific, which means there is no single best predictor. However, implied volatility often performs well. Thus, implied volatility is used to forecast variance. Historical covariance is introduced to capture the co-movement of the three price series. Our forecasting model performs well out of sample; most of the realized net revenues fall in 95 percent prediction interval. Based on this forecasting model and the assumption of a utility function, we compare our prospective evaluation with retrospective evaluation of risk management strategies. Though prospective evaluation is not significantly superior to retrospective evaluation for this particular dataset, it is useful because all the market information has been incorporated in this model and because it did protect producers from adverse price movements.
Half-quantum vortices on c-axis domain walls in chiral p-wave superconductors
Creators: name: Etter, Sarah B.
name: Huang, Wen
name: Sigrist, Manfred
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Chiral superconductors are two-fold degenerate and domains of opposite chirality can form, separated by domain walls. There are indications of such domain formation in the quasi two-dimensional putative chiral $p$-wave superconductor Sr$_2$RuO$_4$, yet no experiment has explicitly resolved individual domains in this material. In this work, $c$-axis domain walls lying parallel to the layers in chiral $p$-wave superconductors are explored from a theoretical point of view. First, using both a phenomenological Ginzburg-Landau and a quasiclassical Bogoliubov-deGennes approach, a consistent qualitative description of the domain wall structure is obtained. While these domains are decoupled in the isotropic limit, there is a finite coupling in anisotropic systems and the domain wall can be treated as an effective Josephson junction. In the second part, the formation and structure of half-quantum vortices (HQV) on such $c$-axis domain walls are discussed.
description: 14 pages, 12 figures; to be submitted to NJP
Welfare Reform and Labor Participation: Are There Urban and Rural Differences?
Creators: name: Pan, Suwen
name: Fuller, Wayne A.
name: Jensen, Helen H.
name: Pan, Suwen
name: Fuller, Wayne A.
name: Jensen, Helen H.
Publisher: name: Unknown
Year: 2001
Subjects: Labor and Human Capital

description: Although welfare reform began in 1996 at the national level, Iowa was one of the earliest states to obtain a waiver to initiate the Iowa Family Investment Program (FIP) in 1993. To gain a better understanding of welfare recidivism, we use Iowa administrative quarterly data between October1993 and September 1995, impute the education attainment for the caseheads with missing education attainment using fractional imputation and study the factors that affect the probability of working, the potential wage for the caseheads and the possibility of leaving FIP based on the potential wage. We find higher education (i.e. higher skills) leads to higher labor force participation, especially for single-mothers with children. Metro or urban location is associated with the probability of working and potential wage earnings, but has no effect on FIP participation. The local unemployment rate does not affect labor participation of low-income individuals, but does affect the potential wage and FIP status. Those with lower education, and nonwhites are more affected by the local labor market environment than others. If an individual moves once in a year, he or she will earn more money than in the original job; no gains are achieved through moving more than once. The possibility of leaving FIP is relatively high if there is only one move.
Crown Detectors to Observe Horizontal and Upward Air-Showers
Creators: name: Fargion, D.
name: Grossi, M.
name: De Santis, M.
name: Lucentini, P. G. De Sanctis
name: Iori, M.
name: Sergi, A.
name: Moscato, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Cerenkov Telescopes and Scintillators set on a Crown-like arrays facing the Horizons may reveal far Cosmic Rays Showers, nearer Anti-Neutrino-Electron + Electron --> W- shower in air and upgoing Tau Neutrino + N--> tau + X, --> Shower, Earth-Skimming tau air-showers. Even UHE SUSY Chi + e--> Selectron--> Chi + e at tens PeVs-EeV energy may blaze at Horizons, as anti-neutrino electron at Glashow peak - Burst shower. We show first estimate on down and up-going Horizontal Showers traces for present and future Magic-like Crown Arrays and their correlated Scintillator-like twin Crown Arrays. The one mono or stereo-Magic elements facing the Horizons are already comparable to present Amanda underground neutrino detector.
description: 11 pages, 5 figures, COSPAR 2004
Cooling photon-pressure circuits into the quantum regime
Creators: name: Rodrigues, I. C.
name: Bothner, D.
name: Steele, G. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum control of electromagnetic fields was initially established in the optical domain and has been advanced to lower frequencies in the gigahertz range during the past decades extending quantum photonics to broader frequency regimes. In standard cryogenic systems, however, thermal decoherence prevents access to the quantum regime for photon frequencies below the gigahertz domain. Here, we engineer two superconducting LC circuits coupled by a photon-pressure interaction and demonstrate sideband cooling of a hot radio frequency (RF) circuit using a microwave cavity. Because of a substantially increased coupling strength, we obtain a large single-photon quantum cooperativity $\mathcal{C}_{\mathrm{q}0} \sim 1$ and reduce the thermal RF occupancy by 75% with less than one pump photon. For larger pump powers, the coupling rate exceeds the RF thermal decoherence rate by a factor of 3, and the RF circuit is cooled into the quantum ground state. Our results lay the foundation for RF quantum photonics.
TOVARLARNI EKSPORT QILISH XIZMATLARNI BAJARISHDA QO'SHILGAN QIYMAT SOLIG'IDA NOLLI STAVKASINING QIYOSIY TAHLILI
Creators: name: Ermatova, Nafosat
Publisher: name: Zenodo
Year: 2024

description: mazkur tezisda tovarlarni eksport qilish xizmatlarini amalga oshirishda qo’shilgan qiymat solig’ida nolli stavkaning qiyosiy tahlili qilindi. Shuningdek, qo’shilgan qiymat solig’ida nolli stavkasi bo’yicha rivojlangan davlatlar tizimi haqida qisqacha tahliliy ma’lumotlar bayon qilindi.
Analysis of KCS2 : a gene encoding a new condensing enzyme for the elongation of very long chain fatty acids in Arabidopsis thaliana
Creators: name: Scherson, Rosa Amelia
Publisher: name: University of British Columbia
Year: 2009

description: Condensing enzymes for very long chain fatty acid (VLCFA) synthesis catalyze the first of a series of four reactions that elongate the growing acyl chain by two carbons at a time. It has been shown that the activity of the condensing enzyme determines the amount and acyl chain length of the VLCFAs produced by a fatty acid elongation system. My research project focused on the characterization of KCS2, a new putative condensing enzyme of Arabidopsis thaliana. Computer database analyses showed that the KCS2 gene is located directly upstream of the FAE1 gene, the first condensing enzyme for the elongation of VLCFAs to be studied in Arabidopsis, suggesting a gene duplication phenomenon. Analysis of the expression pattern of KCS2 showed that the gene was primarily expressed in the anthers of Arabidopsis flowers. The ability of the condensing enzyme to elongate VLCFAs was determined by expressing it in yeast and in seeds of CB25, an Arabidopsis mutant defective in VLCFA elongation in the seed. In both systems, KCS2 was able to catalyze the elongation of VLCFAs. However, the accumulating products of fatty acid elongation carried out by the KCS2 condensing enzyme differed in the two organisms. Yeast accumulated preferentially saturated VLCFAs from C20:0 to C26:0, whereas Arabidopsis seeds accumulated primarily mono-unsaturated VLCFAs, C20:1 and C22:1. Finally, in an attempt to generate co-suppressed plants to determine the function of the KCS2 condensing enzyme, the KCS2 gene was transformed into Arabidopsis plants under the control of the CaMV35S promoter. No visible phenotype was obtained. However, some lines that were over-expressing the gene were able to synthesize more VLCFAs in the seed when compared to the wild type. In contrast, total wax load in stems of 35S-KCS2 over-expressors was not increased. Moreover, there was no correlation between the level of expression of the transgene and the amount of total wax produced. The specific function of the KCS2 condensing enzyme requires further study.
Capital transnacional y propiedad de la tierra: algunos apuntes sobre la dictadura cívico-militar brasileña (1964-1985)
Creators: name: Oliveira, Júlio Ernesto Souza De
Publisher: name: Zenodo
Year: 2020
Subjects: Desarrollo capitalista
Dictadura brasileña
Propiedad de la tierra

description: Proponemos debatir el proceso de desarrollo capitalista sobre la cuestión de la propiedad de la tierra durante la dictadura cívico-militar brasileña (1964-1985), movilizando las claves analíticas de la historia económica y social. Teniendo como cronología el período de 1964 a 1979, analizaremos una cooperación entre el gobierno militar brasileño y la Agencia Japonesa de Cooperación Internacional (JICA), titulada Programa de Cooperación Nipo-brasileña para el Desarrollo de los Cerrados - PRODECER (1979-2001). Con el objetivo de explorar los cerrados brasileños y generar una agroindustria como modelo de exploración y producción de alimentos, esta cooperación se firmó en 1974, durante el gobierno de Ernesto Geisel, y comenzó en 1979, en el curso de la Revolución Verde.
POTENTIAL EFFECTS OF CROP INSURANCE ON FARM ECONOMIC STRUCTURE
Creators: name: Shaik, Saleem
name: Atwood, Joseph A.
name: Shaik, Saleem
name: Atwood, Joseph A.
Publisher: name: Unknown
Year: 2001
Subjects: Farm Management
Risk and Uncertainty

description: The objective of this paper is to examine the potential impacts of crop insurance on farm economic structure using Nebraska county level data from 1980-1998. Using a profit function we fit input demand and output supply equations accounting for insurance premiums and indemnities to examine the economic impacts of crop insurance
Interpolating between low and high energy QCD via a 5D Yang-Mills model
Creators: name: Hirn, Johannes
name: Sanz, Veronica
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe the Goldstone bosons of massless QCD together with an infinite number of spin-1 mesons. The field content of the model is SU(Nf)xSU(Nf) Yang-Mills in a compact extra-dimension. Electroweak interactions reside on one brane. Breaking of chiral symmetry occurs due to the boundary conditions on the other brane, away from our world, and is therefore spontaneous. Our implementation of the holographic recipe maintains chiral symmetry explicit throughout. For intermediate energies, we extract resonance couplings. These satisfy sum rules due to the 5D nature of the model. These sum rules imply, when taking the high energy limit, that perturbative QCD constraints are satisfied. We also illustrate how the 5D model implies a definite prescription for handling infinite sums over 4D resonances. Taking the low energy limit, we recover the chiral expansion and the corresponding non-local order parameters. All local order parameters are introduced separately.
description: Corresponds to published version, with some typos corrected
Some computations in the cyclic permutations of completely rational nets
Creators: name: Xu, Feng
Publisher: name: arXiv
Year: 2005
Subjects: subject: Operator Algebras (math.OA)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 81R15,;17B69

description: In this paper we calculate certain chiral quantities from the cyclic permutation orbifold of a general completely rational net. We determine the fusion of a fundamental soliton, and by suitably modified arguments of A. Coste , T. Gannon and especially P. Bantay to our setting we are able to prove a number of arithmetic properties including congruence subgroup properties for $S, T$ matrices of a completely rational net defined by K.-H. Rehren .
description: 30 Pages Latex
Compounds of symmetric informationally complete measurements and their application in quantum key distribution
Creators: name: Tavakoli, Armin
name: Bengtsson, Ingemar
name: Gisin, Nicolas
name: Renes, Joseph M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Symmetric informationally complete measurements (SICs) are elegant, celebrated and broadly useful discrete structures in Hilbert space. We introduce a more sophisticated discrete structure compounded by several SICs. A SIC-compound is defined to be a collection of $d^3$ vectors in $d$-dimensional Hilbert space that can be partitioned in two different ways: into $d$ SICs and into $d^2$ orthonormal bases. While a priori their existence may appear unlikely when $d>2$, we surprisingly answer it in the positive through an explicit construction for $d=4$. Remarkably this SIC-compound admits a close relation to mutually unbiased bases, as is revealed through quantum state discrimination. Going beyond fundamental considerations, we leverage these exotic properties to construct a protocol for quantum key distribution and analyze its security under general eavesdropping attacks. We show that SIC-compounds enable secure key generation in the presence of errors that are large enough to prevent the success of the generalisation of the six-state protocol.
Back-reaction effects in acoustic black holes
Creators: name: Fagnocchi, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Other Condensed Matter (cond-mat.other)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Acoustic black holes are very interesting non-gravitational objects which can be described by the geometrical formalism of General Relativity. These models can be useful to experimentally test effects otherwise undetectable, as for example the Hawking radiation. The back-reaction effects on the background quantities induced by the analogue Hawking radiation could be the key to indirectly observe it. We briefly show how this analogy works and derive the backreaction equations for the linearized quantum fluctuations in the background of an acoustic black hole. A first order in hbar solution is given in the near horizon region. It indicates that acoustic black holes, unlike Schwarzschild ones, get cooler as they radiate phonons. They show remarkable analogies with near-extremal Reissner-Nordstrom black holes.
description: 10 pages, 1 figure; Talk given at the conference ``Constrained Dynamics and Quantum Gravity (QG05)", Cala Gonone (Italy), September 2005
ACTUAL PURCHASE VS. INTENDED PURCHASE: DO CONSUMERS BUY WHAT THEY SAY?
Creators: name: Rimal, Arbindra
name: Fletcher, Stanley M.
name: McWatters, Kay H.
name: Rimal, Arbindra
name: Fletcher, Stanley M.
name: McWatters, Kay H.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Consumer/Household Economics
subject: Marketing
subject: FOS: Economics and business
subject: beef irradiation
subject: supermarket simulation
subject: actual purchase
subject: purchase intention
subject: bivariate probit

description: A bivariate probit model was used to examine the relationship between actual and intended purchase of irradiated beef. The likelihood ratio test rejected the equality of parameters affecting actual and intended purchase decisions. Actual purchases were affected by package labels and appearance, while purchase intentions were affected by attitude and demographics.
Bounded $\mathbf{H_\infty}$-Calculus for Differential Operators on Conic Manifolds with Boundary
Creators: name: Coriasco, S.
name: Schrohe, E.
name: Seiler, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35J70 (Primary), 47A10, 58J40 (Secondary)

description: We derive conditions that ensure the existence of a bounded $H_\infty$-calculus in weighted $L_p$-Sobolev spaces for closed extensions $\underline{A}_T$ of a differential operator $A$ on a conic manifold with boundary, subject to differential boundary conditions $T$. In general, these conditions ask for a particular pseudodifferential structure of the resolvent $(λ-\underline{A}_T)^{-1}$ in a sector $Λ\subset\mathbf{C}$. In case of the minimal extension they reduce to parameter-ellipticity of the boundary value problem $(A,T)$. Examples concern the Dirichlet and Neumann Laplacians.
description: 23 pages
MEASURING THE RISKS OF NEW YORK DAIRY FARMERS
Creators: name: Schmit, Todd M.
name: Boisvert, Richard N.
name: Tauer, Loren W.
name: Schmit, Todd M.
name: Boisvert, Richard N.
name: Tauer, Loren W.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Industrial Organization
subject: Livestock Production/Industries
subject: variance decomposition
subject: Gini income inequality
subject: dairy farm net returns

description: Decomposition methods suggest major contributors to variability in returns to New York dairy farms are purchased feed quantities and milk production; milk price variability contributes substantially less. Decomposing the Gini measure of income inequality indicates that milk revenues and purchased feed expenditures contribute most to farm return inequality over time.
Interpretable Machine Learning for COVID-19: An Empirical Study on Severity Prediction Task
Creators: name: Wu, Han
name: Ruan, Wenjie
name: Wang, Jiangtao
name: Zheng, Dingchang
name: Liu, Bei
name: Gen, Yayuan
name: Chai, Xiangfei
name: Chen, Jian
name: Li, Kunwei
name: Li, Shaolin
name: Helal, Sumi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: The black-box nature of machine learning models hinders the deployment of some high-accuracy models in medical diagnosis. It is risky to put one's life in the hands of models that medical researchers do not fully understand. However, through model interpretation, black-box models can promptly reveal significant biomarkers that medical practitioners may have overlooked due to the surge of infected patients in the COVID-19 pandemic. This research leverages a database of 92 patients with confirmed SARS-CoV-2 laboratory tests between 18th Jan. 2020 and 5th Mar. 2020, in Zhuhai, China, to identify biomarkers indicative of severity prediction. Through the interpretation of four machine learning models, decision tree, random forests, gradient boosted trees, and neural networks using permutation feature importance, Partial Dependence Plot (PDP), Individual Conditional Expectation (ICE), Accumulated Local Effects (ALE), Local Interpretable Model-agnostic Explanations (LIME), and Shapley Additive Explanation (SHAP), we identify an increase in N-Terminal pro-Brain Natriuretic Peptide (NTproBNP), C-Reaction Protein (CRP), and lactic dehydrogenase (LDH), a decrease in lymphocyte (LYM) is associated with severe infection and an increased risk of death, which is consistent with recent medical research on COVID-19 and other research using dedicated models. We further validate our methods on a large open dataset with 5644 confirmed patients from the Hospital Israelita Albert Einstein, at São Paulo, Brazil from Kaggle, and unveil leukocytes, eosinophils, and platelets as three indicative biomarkers for COVID-19.
description: Accepted by IEEE Transactions on Artificial Intelligence, 2021
IMMUNOTERAPIYA REJIMINI OPTIMALLASHTIRISH VA TIZIMLI KIMYOTERAPIYA OLGAN KO'KRAK BEZI SARATONI TARQALGAN BEMORLAR REABILITATSIYASI
Creators: name: Xalikova, Feruza
Publisher: name: Zenodo
Year: 2024

description: Dunyodagi ekologik va ijtimoiy-iqtisodiy vaziyat deyarli barcha mamlakatlarda malign neoplazmalar bilan kasallanishning intensiv o'sishiga olib keldi. Amalga oshirilgan ilmiy izlanishlarning maqsad va vazifalariga muvofiq, 2021-2023 yillar oralig'ida Buxoro filiali ixtisoslashtirilgan onkologiya va radiologiya Respublika ilmiy tibbiyot markazining kimyoterapiya bo'limida tarqalgan ko'krak bezi saratoni (RMJ) bilan kasallangan 172 nafar bemorni palliativ dori-darmonli o'smaga qarshi davolash bo'yicha so'rov o'tkazildi..
Strategies for reward based crowdfunding campaigns in video games: a context of indie game developers in the UK
Creators: name: Phillips, Robert
Publisher: name: figshare
Year: 2021
Subjects: subject: 150304 Entrepreneurship
subject: FOS: Economics and business
subject: 150201 Finance

description: Abstract: The objective of the study was to define key success factors and challenges of a crowdfunding campaign for an indie games developer in the UK – We suggest that the key success factors identified can be separated into three categories- campaign factors, product factors, and human factors and propose a model including all three. A good campaign needs careful preparation prior to the launch, effective presentation, appropriate funding model with a realistic funding target for a short period, digital reward structure and well-planned marketing activities. Product characteristics appear to be a playable demo of the game which should be unique yet still having some familiar features. Human factors include having a pre-established audience reach, a relevant background in game development and appropriate team size. A main restraining factor was the stress and time cost of running the campaign, whilst intellectual property issues were found to be less important than expected.
WEATHER DERIVATIVES AND SPECIFIC EVENT RISK
Creators: name: Turvey, Calum G.
name: Turvey, Calum G.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Risk and Uncertainty
subject: Heat insurance
subject: rainfall insurance
subject: weather derivatives
subject: weather options
subject: crop insurance
subject: agricultural risk

description: This paper investigates the relationship between weather events and agricultural risks. Specific event risks are defined by outcomes related to a specific event such as low temperature and rainfall. Using Ontario data this paper describes specific events and shows how these specific events can be insured using weather derivatives and insurance.
The Spatial Distribution of Metals in the Intergalactic Medium
Creators: name: Pieri, Matthew M.
name: Schaye, Joop
name: Aguirre, Anthony
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the impact of environment on the metallicity of the diffuse intergalactic medium. We use pixel correlation techniques to search for weak CIV and OVI absorption in the spectrum of quasar Q1422+231 in regions of the spectrum close to and far from galaxies at z ~ 3. This is achieved both by using the positions of observed Lyman break galaxies and by using strong CIV absorption as a proxy for the presence of galaxies near the line of sight. We find that the metal line absorption is a strong function of not only the HI optical depth (and thus gas density) but also proximity to highly enriched regions (and so proximity to galaxies). The parameter ``proximity to galaxies'' can account for some, but not all, of the scatter in the strength of CIV absorption for fixed HI. Finally, we find that even if we limit our analysis to the two thirds of the pixels that are at least 600 km/s from any CIV line that is strong enough to detect unambiguously (tau_CIV > 0.1), our statistical analysis reveals only slightly less CIV for fixed HI than when we analyze the whole spectrum. We conclude that while the metallicity is enhanced in regions close to (Lyman-break) galaxies, the enrichment is likely to be much more widespread than their immediate surroundings.
description: 16 pages, 7 figures. Accepted for publication in the Astrophysical Journal. Revised version taking referee's comments into account, minor changes
Perfect Prishchepov groups
Creators: name: Chinyere, Ihechukwu
name: Bainson, Bernard Oduoku
Publisher: name: arXiv
Year: 2020
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 12E05, 20F05, 20F65, 57M07, 57M15

description: We study cyclically presented groups of type $\mathfrak{F}$ to determine when they are perfect. It turns out that to do so, it is enough to consider the Prishchepov groups, so modulo a certain conjecture, we classify the perfect Prishchepov groups $P(r,n,k,s,q)$ in terms of the defining integer parameters $r,n,k,s,q$. In particular, we obtain a classification of the perfect Campbell and Robertson's Fibonacci-type groups $H(r,n,s)$, thereby proving a conjecture of Williams, and yielding a complete classification of the groups $H(r,n,s)$ that are connected Labelled Oriented Graph groups.
description: 21 pages
Roche Lobe Shapes for testing MOND-like Modified Gravity
Creators: name: Zhao, HongSheng
name: Tian, LanLan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Dark Matter (DM) theories and mass-tracing-light theories like MOND are by construction nearly degenerate on galactic scales, but not when it comes to the predicted shapes of Roche Lobes of a two-body system (e.g., a globular cluster orbiting a host galaxy). We show that the flattening of the Roche lobe is sensitive to the function mu(g) in modification of the law of gravity. We generalise the analytical results obtained in the deep-MOND limit by Zhao (2005, astro-ph/0511713 and astro-ph/0512425), and consider a binary in the framework of a MOND-like gravity modification function mu(g) or a general non-Keplerian gravity g \propto R^-ζ. We give analytical expressions for the inner Lagrange point and Robe lobe axis ratios. The Roche lobe volume is proven to scale linearly with the true mass ratio, which applies to any mu(g), hence mass-tracing light models would overpredict the Roche lobe of a DM-poor globular cluster in a DM-rich host galaxy, and underpredict the size of a DM-richer dwarf satellite. The lobes are squashed with the flattening ~ 0.4 in the strong gravity and ~ 0.6 in the weak gravity; a precise measurement of the flattening could be used to verify the anisotropic dilation effect which is generic to MOND-like gravity. We generalise these results for extended mass distribution, and compare predicted Roche radii in different gravity theories with limiting radii of observed globular clusters and dwarf galaxy satellites.
description: 11p, 7 figs, accepted for Astronomy and Astrophysics
THE IMPACT OF STRUCTURAL CHANGE IN CHINESE LIVESTOCK PRODUCTION ON WORLD FEED GRAIN TRADE
Creators: name: Fuller, Frank H.
name: Fang, Cheng
name: Fuller, Frank H.
name: Fang, Cheng
Publisher: name: Unknown
Year: 1999
Subjects: subject: International Relations/Trade
subject: Livestock Production/Industries
subject: Research and Development/Tech Change/Emerging Technologies
subject: China
subject: Feed Demand
subject: Grain Trade
subject: Technological Change

description: Using household survey data from seven provinces in China, this study provides estimates of the price responsiveness of feed demand by traditional and specialized household pork and poultry producers. Estimated elasticities are used to simulate the impacts of structural change in China's livestock industry on feed grain trade.
Vortex Lattices in Rotating Atomic Bose Gases with Dipolar Interactions
Creators: name: Cooper, N. R.
name: Rezayi, E. H.
name: Simon, S. H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that dipolar interactions have dramatic effects on the groundstates of rotating atomic Bose gases in the weak interaction limit. With increasing dipolar interaction (relative to the net contact interaction), the mean-field, or high filling fraction, groundstate undergoes a series of transitions between vortex lattices of different symmetries: triangular, square, ``stripe'', and ``bubble'' phases. We also study the effects of dipolar interactions on the quantum fluids at low filling fractions. We show that the incompressible Laughlin state at filling fraction $ν=1/2$ is replaced by compressible stripe and bubble phases.
description: 4 pages, 2 figures
ECONOMIES OF SCALE, HOUSEHOLD SIZE, AND THE DEMAND FOR FOOD: THE MISSING LINK
Creators: name: Benin, Samuel
name: Benin, Samuel
Publisher: name: Unknown
Year: 1999
Subjects: subject: Consumer/Household Economics
subject: Demand and Price Analysis
subject: demand
subject: price analysis

description: For the same level of per capita resources, larger households are deemed better off due to possible scale economies from consuming household public goods. Contradictory evidence that per capita demand for food declines with household size has puzzled economists. This paper suggests that larger households have costs associated with sharing food, especially high-value foods, and so they substitute towards cheaper and basic foods, whose per capita demand increases with household size. However, since high-value foods form a larger proportion of the budget on all foods, per capita demand for all foods declines with household size when Engel food-share equation is estimated using aggregate food expenditure data.
eXtreme Modelling in Practice
Creators: name: Davis, A. Jesse Jiryu
name: Hirschhorn, Max
name: Schvimer, Judah
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Formal modelling is a powerful tool for developing complex systems. At MongoDB, we use TLA+ to model and verify multiple aspects of several systems. Ensuring conformance between a specification and its implementation can add value to any specification; it can avoid transcription errors, prevent bugs as a large organization rapidly develops the specified code, and even keep multiple implementations of the same specification in sync. In this paper, we explore model-based testing as a tool for ensuring specification-implementation conformance. We attempted two case studies: model-based trace-checking (MBTC) in the MongoDB Server's replication protocol and model-based test-case generation (MBTCG) in MongoDB Realm Sync's operational transformation algorithm. We found MBTC to be impractical for testing that the Server conformed to a highly abstract specification. MBTCG was highly successful for Realm Sync, however. We analyze why one technique succeeded and the other failed, and advise future implementers making similar attempts at model-based testing.
Sliced Inverse Regression for Spatial Data
Creators: name: Muehlmann, Christoph
name: Oja, Hannu
name: Nordhausen, Klaus
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Sliced inverse regression is one of the most popular sufficient dimension reduction methods. Originally, it was designed for independent and identically distributed data and recently extend to the case of serially and spatially dependent data. In this work we extend it to the case of spatially dependent data where the response might depend also on neighbouring covariates when the observations are taken on a grid-like structure as it is often the case in econometric spatial regression applications. We suggest guidelines on how to decide upon the dimension of the subspace of interest and also which spatial lag might be of interest when modeling the response. These guidelines are supported by a conducted simulation study.
MODELING COUPON VALUES FOR READY-TO-EAT BREAKFAST CEREALS
Creators: name: Price, Gregory K.
name: Connor, John M.
name: Fulton, Joan R.
name: Price, Gregory K.
name: Connor, John M.
name: Fulton, Joan R.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Consumer/Household Economics
subject: Research Methods/ Statistical Methods
subject: coupons
subject: ready-to-eat breakfast cereals
subject: panel data model

description: A theoretical framework is developed to highlight the significant determinants of coupon values. A fixed effects panel data model is fitted with data from the breakfast cereal industry. The explanatory variables include own retail price, brand loyalty, brand market share, rival coupon redemptions, and firm and product type indicators.
$D^0$--$\bar{D}{}^0$ hadronic mixing and DCS decays from FOCUS
Creators: name: Stenson, Kevin
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present an analysis of the decay $D^0 \to K^+π^-$ from FOCUS. From a sample of 234 events we find a branching ratio of $\frac{Γ(D^0 \to K^+π^-)}{Γ(D^0 \to K^-π^+)} = (0.430^{+0.062}_{-0.061}\pm 0.031)%$ under the assumption of no mixing and no CP violation. We also present limits on charm mixing.
description: Proceedings from talk at 2004 DPF Meeting at University of California, Riverside