cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Threshold Resummation Effects in Direct Top Quark Production at Hadron Colliders
Creators: name: Yang, Li Lin
name: Li, Chong Sheng
name: Gao, Yang
name: Liu, Jian Jun
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the threshold-enhanced QCD corrections to the cross sections for direct top quark productions induced by model-independent flavor changing neutral current couplings at hadron colliders. We use the soft-collinear effective theory to describe the incoming massless partons and use the heavy quark effective theory to treat the top quark. Then we construct the flavor changing operator based on the above effective theories, and resum the large logarithms near threshold arising from soft gluon emission. Our results show that the resummed QCD corrections further enhance the next-to-leading order cross sections significantly. Moreover, the resummation effects vastly reduce the dependence of the cross sections on the renormalization and factorization scales, especially in cases where the next-to-leading order results behave worse than the leading order results. Our results are more sensitive to the new physics effects. If signals of direct top quark production are found in future experiments, it is more appropriate to use our results as the theoretical inputs for extracting the anomalous couplings.
description: 5 pages, 4 figures, use revtex4 and amsmath; version to appear in Phys. Rev. D
SEQUENTIAL ADOPTION OF SITE-SPECIFIC TECHNOLOGIES AND ITS IMPLICATIONS FOR NITROGEN PRODUCTIVITY: A DOUBLE SELECTIVITY MODEL
Creators: name: Khanna, Madhu
name: Khanna, Madhu
Publisher: name: Unknown
Year: 1999
Subjects: subject: Crop Production/Industries
subject: Research Methods/ Statistical Methods
subject: site-specific crop management
subject: adoption
subject: bivariate probit
subject: sample selection

description: This paper analyzes the sequential decision to adopt two site-specific technologies, soil testing and variable rate technology (VRT), and their impact on nitrogen productivity in four Midwestern states. The results indicate that while farm location was a key variable influencing the adoption of soil testing, human capital and innovativeness of farmers had a significant impact on the adoption of VRT. A double selectivity model applied to correct for sample selection bias shows that gains in nitrogen productivity due to the two adoption decisions are largest for farms with below average soil quality and statistically insignificant for farms with above average soil quality. These findings have implications for the targeting of public policies designed to promote adoption to reduce nitrate pollution.
Geometric Structures on the Cochains of a Manifold
Creators: name: Wilson, Scott O.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Geometric Topology (math.GT)
subject: Mathematical Physics (math-ph)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 57N16, 57Q15

description: In this paper we develop several algebraic structures on the simplicial cochains of a triangulated manifold that are analogues of objects in differential geometry. We study a cochain product and prove several statements about its convergence to the wedge product on differential forms. Also, for cochains with an inner product, we define a combinatorial Hodge star operator, and describe some applications, including a combinatorial period matrix for surfaces. We show that for a particularly nice cochain inner product, these combinatorial structures converge to their continuum analogues as the mesh of a triangulation tends to zero.
description: 37 pages. Corrected typos. Labeled figures. Additional references and acknowledgements
REASSESSING PRODUCTIVITY GROWTH IN AFRICAN AGRICULTURE
Creators: name: Chan-Kang, Connie
name: Pardey, Philip G.
name: Wood, Stanley
name: Roseboom, Johannes
name: Cremers, Marleen
name: Chan-Kang, Connie
name: Pardey, Philip G.
name: Wood, Stanley
name: Roseboom, Johannes
name: Cremers, Marleen
Publisher: name: Unknown
Year: 1999
Subjects: Productivity Analysis

description: This paper uses a new panel data set to examine sources of growth in African agriculture. While conventional inputs continue to be the main source of labor productivity growth in Africa, land and labor quality differentials are also significant in explaining observed cross-country productivity patterns.
Partial ordering of risky choices : anchoring, preference for flexibility and applications to asset pricing
Creators: name: Sagi, Jacob S.
Publisher: name: University of British Columbia
Year: 2009

description: This dissertation describes two theories of risky choice based on a normatively axiomatized partial order. The first theory is an atemporal alternative to von Neumann and Morgenstern's Expected Utility Theory that accommodates the status quo bias, violations of Independence and preference reversals. The second theory is an extension of the Inter-temporal von Neumann-Morgenstern theory of Kreps and Porteus (1978) that features a normatively deduced preference for flexibility. A substantial part of the thesis is devoted to examining equilibrium implications of the inter-temporal theory. In particular, a multi-agent multi-period Bayesian rational expectations equilibrium is shown to exist under certain conditions. Implications to asset pricing are then investigated with an explicit parameterization of the model.
Four new wide binaries among exoplanet host stars
Creators: name: Mugrauer, M.
name: Neuhaeuser, R.
name: Seifahrt, A.
name: Mazeh, T.
name: Guenther, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In our ongoing survey for wide (sub)stellar companions of exoplanet host stars we have found 4 new co-moving stellar companions of the stars HD114729, HD16141, HD196050 and HD213240 with projected separations from 223 up to 3898AU. The companionship of HD114729B, HD196050B and HD213240C is confirmed by photometry and spectroscopy, all being early M dwarfs. The masses of the detected companions are derived from their infrared JHK magnitudes and range between 0.146 and 0.363 Msun. Our first and second epoch observations can rule out additional stellar companions around the primaries from ~200 up to ~2400 AU (S/N=10). In our survey we have found so far 6 new binaries among the exoplanet host stars. According to these new detections, the reported differences between single-star and binary-star planets with orbital periods short than 40 days remain significant in both the mass-period and eccentricity-period distribution. In contrast, all exoplanets with orbital periods longer than 100 days tend to display similar distributions.
description: 10 pages, 16 figures, A&A accepted
Type Checking Extracted Methods
Creators: name: Fu, Yuquan
name: Tobin-Hochstadt, Sam
Publisher: name: arXiv
Year: 2020
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Many object-oriented dynamic languages allow programmers to _extract methods_ from objects and treat them as functions. This allows for flexible programming patterns, but presents challenges for type systems. In particular, a simple treatment of method extraction would require methods to be contravariant in the receiver type, making overriding all-but-impossible. We present a detailed investigation of this problem, as well as an implemented and evaluated solution. Method extraction is a feature of many dynamically-typed and gradually-typed languages, ranging from Python and PHP to Flow and TypeScript. In these languages, the underlying representation of objects as records of procedures can be accessed, and the procedures that implement methods can be reified as functions that can be called independently. In many of these languages, the programmer can then explicitly specify the `this` value to be used when the method implementation is called. Unfortunately, as we show, existing gradual type systems such as TypeScript and Flow are unsound in the presence of method extraction. The problem for typing any such system is that the flexibility it allows must be tamed by requiring a connection between the object the method was extracted from, and the function value that is later called. In Racket, where a method extraction-like facility, dubbed "structure type properties", is fundamental to classes, generic methods, and other APIs, these same challenges arise, and must be solved to support this feature in Typed Racket. We show how to combine two existing type system features -- existential types and occurrence typing -- to produce a sound approach to typing method extraction. We formalize our design, extending an existing formal model of the Typed Racket type system, and prove that our extension is sound. Our design is also implemented in the released version of Racket, and is compatible with all existing Typed Racket packages, many of which already used a previous version of this feature.
Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation
Creators: name: Hirata, Christopher M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The first UV sources in the universe are expected to have coupled the HI spin temperature to the gas kinetic temperature via scattering in the Lyman-alpha resonance [the Wouthuysen-Field (WF) effect]. By establishing an HI spin temperature different from the temperature of the CMB, the WF effect should allow observations of HI during the reionization epoch in the redshifted 21 cm line. This paper investigates four mechanisms that can affect the strength of the WF effect that were not previously considered: (1) Photons redshifting into the HI Lyman resonances may excite an H atom and result in a radiative cascade terminating in two-photon 2s->1s emission, rather than always degrading to Lyman-alpha as usually assumed. (2) The fine structure of the Lyman-alpha resonance alters the photon frequency distribution and leads to a suppression of the scattering rate. (3) The spin-flip scatterings change the frequency of the photon and cause the photon spectrum to relax not to the kinetic temperature of the gas but to a temperature between the kinetic and spin temperatures, effectively reducing the strength of the Wouthuysen-Field coupling. (4) Near line centre, a photon can change its frequency by several times the line width in a single scattering event, thus potentially invalidating the usual calculation of the Lyman-alpha spectral distortion based on the diffusion approximation. It is shown that (1) suppresses the WF coupling strength by a factor of up to ~2, while (2) and (3) are important only at low kinetic temperatures. Effect (4) has a <=3% effect for kinetic temperatures T_k>=2K. If the pre-reionization IGM was efficiently heated by X-rays, only effect (1) is important. Fitting formulae are provided for the range of T_k>=2K and Gunn-Peterson optical depth 10^5--10^7. [ABRIDGED]
description: 17 pages, 7 figures, MNRAS accepted version
Dropping rho and A_1 Meson Masses at Chiral Phase Transition in the Generalized Hidden Local Symmetry
Creators: name: Harada, M.
name: Sasaki, C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the chiral symmetry restoration using the generalized hidden local symmetry (GHLS) which incorporates the rho and A_1 mesons as the gauge bosons of the GHLS and the pion as the Nambu-Goldstone boson consistently with the chiral symmetry of QCD. We show that a set of parameter relations, which ensures the first and second Weinberg's sum rules, is invariant under the renormalization group evolution. Then, we found that the Weinberg's sum rules together with the matching of the vector and axial-vector current correlators inevitably leads to {\it the dropping masses of both rho and A_1 mesons} at the symmetry restoration point, and that the mass ratio as well as the mixing angle between the pion and A_1 meson flows into one of three fixed points.
description: 17 pages, 7 figures; references added and discussions expanded
Abrupt transition in a sandpile model
Creators: name: Contoyiannis, Y. F.
name: Diakonos, F. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We present a fixed energy sandpile (FES) model which, by increasing the initial energy,undergoes, at the level of individual configurations, a discontinuous transition.The model is obtained by modifying the toppling procedure in the BTW rules: the energy transfer from a toppling site takes place only to neighbouring sites with less energy (negative gradient constraint) and with a time ordering (asynchronous). The model is minimal in the sense that removing either of the two above mentioned constraints (negative gradient or time ordering) the abrupt transition goes over to a continuous transition as in the usual BTW case. Therefore the proposed model offers an unique possibility to explore at the microscopic level the basic mechanisms underlying discontinuous transitions.
description: 7 pages, 5 figures
PRODUCTION INTERRELATIONSHIPS IN SRI LANKAN PEASANT AGRICULTURE
Creators: name: Shumway, C. Richard
name: Jegasothy, Kandiah
name: Alexander, William P.
name: Shumway, C. Richard
name: Jegasothy, Kandiah
name: Alexander, William P.
Publisher: name: Unknown
Year: 1988
Subjects: Productivity Analysis
Research Methods/ Statistical Methods

description: Technical change and the extent to which commodity supplies and input demands are interrelated in Sri Lankan peasant agriculture are explored in this paper. Using a multiple-product dual model, a seemingly unrelated system of product supply and input demand equations is estimated for four crops and four variable inputs. Restrictions based on competitive behaviour and a twice continuously-differentiable production function are maintained in the non-linear least squares estimation. A number of important interrelationships in individual product supplies and input demands are identified, further documenting the need to account for intercommodity production relationships in econometric and simulation studies and in policy formulation. Non-joint production and Hicksneutral technical change are both rejected.
The three-dimensional Dirac-Oscillator in the presence of Aharonov-Bohm and magnetic monopole potentials
Creators: name: Alhaidari, A. D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the Dirac equation in 3+1 dimensions with non-minimal coupling to isotropic radial three-vector potential and in the presence of static electromagnetic potential. The space component of the electromagnetic potential has angular (non-central) dependence such that the Dirac equation is completely separable in spherical coordinates. We obtain exact solutions for the case where the three-vector potential is linear in the radial coordinate (Dirac-Oscillator) and the time component of the electromagnetic potential vanishes. The relativistic energy spectrum and spinor eigenfunctions are obtained.
description: 10 pages
Position Reconstruction in Drift Chambers operated with Xe, CO2 (15%)
Creators: name: Adler, C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present measurements of position and angular resolution of drift chambers operated with a Xe,CO$_2$(15%) mixture. The results are compared to Monte Carlo simulations and important systematic effects, in particular the dispersive nature of the absorption of transition radiation and non-linearities, are discussed. The measurements were carried out with prototype drift chambers of the ALICE Transition Radiation Detector, but our findings can be generalized to other drift chambers with similar geometry, where the electron drift is perpendicular to the wire planes.
description: 30 pages, 18 figures
WEAK SEPARABILITY AND A TEST FOR THE SPECIFICATION OF INCOME IN DEMAND MODELS WITH AN APPLICATION TO THE DEMAND FOR MEAT IN AUSTRALIA
Creators: name: Alston, Julian M.
name: Chalfant, James A.
name: Alston, Julian M.
name: Chalfant, James A.
Publisher: name: Unknown
Year: 1987
Subjects: Demand and Price Analysis

description: Most studies of the demand for meat in Australia have used some measure of total income or expenditure, but two recent studies have assumed weak separability of a meat group and used expenditure on the meat group instead. These specification differences are of interest to the extent that they affect the economic interpretation, goodness-of-fit, elasticity estimates, predictive performance or hypothesis tests in empirical demand equations. In this paper, non-nested hypothesis testing procedures are used to test the alternative specifications of the income variable and the hypothesis of separability. The results favour the use of the expenditure variable implied by separability but are mixed concerning whether separability holds.
Resonant Sub-GeV Dirac Dark Matter
Creators: name: Bernreuther, Elias
name: Heeba, Saniya
name: Kahlhoefer, Felix
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the phenomenology and detection prospects of a sub-GeV Dirac dark matter candidate with resonantly enhanced annihilations via a dark photon mediator. The model evades cosmological constraints on light thermal particles in the early universe while simultaneously being in reach of current and upcoming terrestrial experiments. We conduct a global analysis of the parameter space , considering bounds from accelerator and direct detection experiments, as well as those arising from Big Bang Nucleosynthesis, the Cosmic Microwave Background and dark matter self-interactions. We also extend our discussion to the case of a dark matter subcomponent. We find that large regions of parameter space remain viable even for the case of a moderate resonant enhancement, and demonstrate the complementarity of different experimental strategies for further exploring this scenario.
description: 20 pages, 7 figures + appendices; v2: matches published version; v3: minor correction to figure 7, conclusions unchanged
RESOURCE DEGRADATION ON AGRICULTURAL LAND: INFORMATION PROBLEMS, MARKET FAILURES AND GOVERNMENT INTERVENTION
Creators: name: Wills, Ian R.
name: Wills, Ian R.
Publisher: name: Unknown
Year: 1987
Subjects: Land Economics/Use
Resource /Energy Economics and Policy

description: Information problems impede private contracting for the supply of many natural resource services. They are also likely to prevent the government identifying and achieving optimum levels of natural resource degradation on agricultural land. In particular, the distributional impacts of government intervention create incentives for strategic distortions of information by interested parties. Resource conservation measures which impose costs on beneficiaries, and which provide positive incentives for farmers to monitor resource degradation, may be superior because they reduce information problems.
Descriptions of issues and comments for predicting issue success in software projects
Creators: name: Ramírez-Mora, Sandra L.
name: Oktaba, Hanna
name: Gómez-Adorno, Helena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Software development tasks must be performed successfully to achieve software quality and customer satisfaction. Knowing whether software tasks are likely to fail is essential to ensure the success of software projects. Issue Tracking Systems store information of software tasks (issues) and comments, which can be useful to predict issue success; however; almost no research on this topic exists. This work studies the usefulness of textual descriptions of issues and comments for predicting whether issues will be resolved successfully or not. Issues and comments of 588 software projects were extracted from four popular Issue Tracking Systems. Seven machine learning classifiers were trained on 30k issues and more than 120k comments, and more than 6000 experiments were performed to predict the success of three types of issues: bugs, improvements and new features. The results provided evidence that descriptions of issues and comments are useful for predicting issue success with more than 85% of accuracy and precision, and that the predictions of issue success vary over time. Words related to software development were particularly relevant for predicting issue success. Other communication aspects and their relationship to the success of software projects must be researched in detail using data from software tools.
description: 65 pages; 15 figures
Basis of Local Approach in Classical Statistical Mechanics
Creators: name: Sharov, S. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: An ensemble of classical subsystems interacting with surrounding particles has been considered. In general case, a phase volume of the subsystems ensemble was shown to be a function of time. The evolutional equations of the ensemble are obtained as well as the simplest solution of these equations representing the quasi-local distribution with the temperature pattern being assigned. Unlike the Gibbs's distribution, the energy of interaction with surrounding particles appears in the distribution function, which make possible both evolution in the equilibrium case and fluctuations in the non-equilibrium one. The expression for local entropy is obtained. The exact expressions for changing entropy and quantity of the heat given by the environment have been obtained. A two-particle distribution function for pair interaction system has been obtained with the use of local conditional distribution functions. Its formula is exact disregarding edge conditions.The derivation of hydrodynamic equations from Boltzmann equation has been analyzed. The hydrodynamic equations obtained from Boltzmann equation were shown to be equations for ideal liquid. Reasons for stochastic description in deterministic Hamilton's systems, conditions of applicability of Poincares recurrence theorem as well as the problem of irreversibility have been considered.
description: 10 pages
Quantum entanglement and modulation enhancement of free-electron-bound-electron interaction
Creators: name: Zhao, Zhexin
name: Sun, Xiao-Qi
name: Fan, Shanhui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The modulation and engineering of the free-electron wave function bring new ingredients to the electron-matter interaction. We study the dynamics of a free-electron passing by a two-level system fully quantum mechanically and emphasize the enhancement of interaction from the modulation of the free-electron wave function. In presence of modulation of the free-electron wave function, we show that the electron energy loss/gain spectrum is greatly enhanced for a coherent initial state of the two-level system, which can function as a probe of the atomic coherence. We further find that distantly separated two-level atoms can be entangled through interacting with the same free electron. For a dilute beam of modulated electrons interacting with the atom, our theory shows the enhanced interaction due to resonant modulation.
description: Minor revisions. Expansion of the supplemental material
A FARM GROWTH MODEL FOR POLICY ANALYSIS IN AN EXTENSIVE PASTORAL PRODUCTION SYSTEM
Creators: name: Beck, Anthony C.
name: Dent, J. Barry
name: Beck, Anthony C.
name: Dent, J. Barry
Publisher: name: Unknown
Year: 1987
Subjects: Productivity Analysis

description: The development of a simulation model of an extensive pastoral farming system to assist analysts in their assessment of government policy measures is described. The model was designed to simulate, over a number of years, the physical and financial operation of a sheep and beef production system typically found in the North Island hill country of New Zealand. By manipulating model parameters and data related to prices, costs, taxation and credit, a range of policies can be represented and their effects simulated. The model is used to undertake an ex post analysis of the farm-level impact of the supplementary minimum price scheme in New Zealand and to project farm performance following the abolition of the scheme. Consideration is given to the use of the model to represent sheep and beef production systems elsewhere.
Matter-wave interferometry in a double well on an atom chip
Creators: name: Schumm, T.
name: Hofferberth, S.
name: Andersson, L. M.
name: Wildermuth, S.
name: Groth, S.
name: Bar-Joseph, I.
name: Schmiedmayer, J.
name: Kruger, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Matter-wave interference experiments enable us to study matter at its most basic, quantum level and form the basis of high-precision sensors for applications such as inertial and gravitational field sensing. Success in both of these pursuits requires the development of atom-optical elements that can manipulate matter waves at the same time as preserving their coherence and phase. Here, we present an integrated interferometer based on a simple, coherent matter-wave beam splitter constructed on an atom chip. Through the use of radio-frequency-induced adiabatic double-well potentials, we demonstrate the splitting of Bose-Einstein condensates into two clouds separated by distances ranging from 3 to 80 microns, enabling access to both tunnelling and isolated regimes. Moreover, by analysing the interference patterns formed by combining two clouds of ultracold atoms originating from a single condensate, we measure the deterministic phase evolution throughout the splitting process. We show that we can control the relative phase between the two fully separated samples and that our beam splitter is phase-preserving.
CHANGE, ADJUSTMENT AND THE ROLE OF SPECIFIC EXPERIENCE: EVIDENCE FROM SRI LANKAN RICE FARMING
Creators: name: Ekanayake, S.A.B.
name: Jayasuriya, Sisira
name: Ekanayake, S.A.B.
name: Jayasuriya, Sisira
Publisher: name: Unknown
Year: 1989
Subjects: Labor and Human Capital

description: Human capital comprising various components, such as different types of training, experience and skills, influences the capacity of economic agents to adjust to changing environments. We distinguish between formal education, general experience and various types of specific experience as determinants of adjustment to disequilibria in agriculture and demonstrate that their relative importance varies according to the nature of the changes facing the farmers. The results provide strong support for the importance of land-specific experience even in 'modernising' situations.
THE ENVIRONMENTAL EFFECTS OF ADOPTING IPM TECHNIQUES: THE CASE OF PEACH PRODUCERS
Creators: name: Fernandez-Cornejo, Jorge
name: Ferraioli, Jennifer
name: Fernandez-Cornejo, Jorge
name: Ferraioli, Jennifer
Publisher: name: Unknown
Year: 1999
Subjects: subject: Environmental Economics and Policy
subject: biological techniques
subject: cultural techniques
subject: integrated pest management
subject: peach production
subject: pesticide use
subject: self-selection
subject: toxicity

description: The impact of adopting integrated pest management (IPM) techniques is examined for peach producers in eight states accounting for most of the U.S. production. The method accounts for self-selectivity, simultaneity, and the pesticide demand equations are theoretically consistent with a restricted-profit function. Biological pest management techniques tend to reduce pesticide use and pesticide toxicity substantially, while pesticide-efficiency techniques (using scouting and economic thresholds) have an increasing effect on pesticide use and toxicity, and cultural techniques have an insignificant effect on pesticide use and toxicity.
THE SUPPLY OF STORAGE UNDER HETEROGENEOUS EXPECTATIONS
Creators: name: Frechette, Darren L.
name: Frechette, Darren L.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: storage
subject: heterogeneous expectations
subject: noise traders

description: Expected prices for storable commodities often lie below spot prices plus interest and marginal storage charges. Recently this gap has been explained as the value of a call option held by a representative storer whenever a positive probability exists that stocks could dwindle to zero. However, the probability of an aggregate stock-out is effectively zero in most markets most of the time. This paper presents an alternative model that explains the gap as an equilibrium between fundamentals traders and noise traders. Applications of the model suggest that rational agents make up 84 percent of the U.S. copper market, and more than 95 percent of the corn and wheat markets.
Epileptic seizure prediction using Pearson's product-moment correlation coefficient of a linear classifier from generalized Gaussian modeling
Creators: name: Quintero-Rincon, Antonio
name: D'Giano, Carlos
name: Risk, Marcelo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applications (stat.AP)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: To predict an epileptic event means the ability to determine in advance the time of the seizure with the highest possible accuracy. A correct prediction benchmark for epilepsy events in clinical applications is a typical problem in biomedical signal processing that helps to an appropriate diagnosis and treatment of this disease. In this work, we use Pearson's product-moment correlation coefficient from generalized Gaussian distribution parameters coupled with a linear-based classifier to predict between seizure and non-seizure events in epileptic EEG signals. The performance in 36 epileptic events from 9 patients showing good performance with 100% of effectiveness for sensitivity and specificity greater than 83% for seizures events in all brain rhythms. Pearson's test suggests that all brain rhythms are highly correlated in non-seizure events but no during the seizure events. This suggests that our model can be scaled with the Pearson's product-moment correlation coefficient for the detection of epileptic seizures.
description: 8 pages, 5 figures, 3 tables, manuscript in spanish
ACTUARIAL EFFECTS OF UNIT STRUCTURE IN THE U.S. ACTUAL PRODUCTION HISTORY CROP INSURANCE PROGRAM
Creators: name: Knight, Thomas O.
name: Coble, Keith H.
name: Knight, Thomas O.
name: Coble, Keith H.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Risk and Uncertainty
subject: Actual Production History Program (APHP)
subject: crop insurance programs

description: This paper examines the effects of optional subdivision on APHP losses for wheat, corn, and soybeans. Thirty-seven state/crop programs are analyzed and the implications of the results are discussed in relation to newly developed crop and revenue insurance programs. The results illustrate the importance of incorporating actuarial experience into the premium rate structure and contract provisions of an insurance program.
Modeling for Semiconductor Spintronics
Creators: name: Saikin, S.
name: Pershin, Yu. V.
name: Privman, V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We summarize semiclassical modeling methods, including drift-diffusion, kinetic transport equation and Monte Carlo simulation approaches, utilized in studies of spin dynamics and transport in semiconductor structures. As a review of the work by our group, several examples of applications of these modeling techniques are presented.
description: 31 pages, 9 figures
A note on common zeroes of Laplace--Beltrami eigenfunctions
Creators: name: Gichev, V. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Metric Geometry (math.MG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 58J50

description: Let $\De u+\la u=\De v+\la v=0$, where $\De$ is the Laplace--Beltrami operator on a compact connected smooth manifold $M$ and $\la>0$. If $H^1(M)=0$ then there exists $p\in M$ such that $u(p)=v(p)=0$. For homogeneous $M$, $H^1(M)\neq0$ implies the existence of a pair $u,v$ as above that has no common zero.
description: 8 pages. This is the published paper with several additional comments in footnotes
GEORGIA COTTON ACREAGE RESPONSE TO THE BOLL WEEVIL ERADICATION PROGRAM
Creators: name: Tribble, Camille M.
name: McIntosh, Christopher S.
name: Wetzstein, Michael E.
name: Tribble, Camille M.
name: McIntosh, Christopher S.
name: Wetzstein, Michael E.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Crop Production/Industries
subject: adaptive regression
subject: pest eradication
subject: producer surplus

description: An adaptive regression model is employed for estimating pre-and post-boll weevil eradication cotton-acreage response. Results indicate cotton acreage becoming more inelastic to own- and cross-price changes. As a result of this shift in acreage response and yield increases from eradication, net producer benefits on average are $88.73 per acre.
Wearable Respiration Monitoring: Interpretable Inference with Context and Sensor Biomarkers
Creators: name: Alam, Ridwan
name: Peden, David B.
name: Lach, John C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: I.2.1

description: Breathing rate (BR), minute ventilation (VE), and other respiratory parameters are essential for real-time patient monitoring in many acute health conditions, such as asthma. The clinical standard for measuring respiration, namely Spirometry, is hardly suitable for continuous use. Wearables can track many physiological signals, like ECG and motion, yet not respiration. Deriving respiration from other modalities has become an area of active research. In this work, we infer respiratory parameters from wearable ECG and wrist motion signals. We propose a modular and generalizable classification-regression pipeline to utilize available context information, such as physical activity, in learning context-conditioned inference models. Morphological and power domain novel features from the wearable ECG are extracted to use with these models. Exploratory feature selection methods are incorporated in this pipeline to discover application-specific interpretable biomarkers. Using data from 15 subjects, we evaluate two implementations of the proposed pipeline: for inferring BR and VE. Each implementation compares generalized linear model, random forest, support vector machine, Gaussian process regression, and neighborhood component analysis as contextual regression models. Permutation, regularization, and relevance determination methods are used to rank the ECG features to identify robust ECG biomarkers across models and activities. This work demonstrates the potential of wearable sensors not only in continuous monitoring, but also in designing biomarker-driven preventive measures.
description: 10 pages, 10 figures
From the stress response function (back) to the sandpile `dip'
Creators: name: Atman, A. P. F.
name: Brunet, P.
name: Geng, J.
name: Reydellet, G.
name: Claudin, P.
name: Behringer, R. P.
name: Clément, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We relate the pressure `dip' observed at the bottom of a sandpile prepared by successive avalanches to the stress profile obtained on sheared granular layers in response to a localized vertical overload. We show that, within a simple anisotropic elastic analysis, the skewness and the tilt of the response profile caused by shearing provide a qualitative agreement with the sandpile dip effect. We conclude that the texture anisotropy produced by the avalanches is in essence similar to that induced by a simple shearing -- albeit tilted by the angle of repose of the pile. This work also shows that this response function technique could be very well adapted to probe the texture of static granular packing.
description: 8 pages, 8 figures, accepted version to appear in Eur. Phys. J. E
One-magnon Raman scattering in La(2)CuO(4): the origin of the field-induced mode
Creators: name: Neto, M. B. Silva
name: Benfatto, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the one-magnon Raman scattering in the layered antiferromagnetic La(2)CuO(4) compound. We find that the Raman signal is composed by two one-magnon peaks: one in the B1g channel, corresponding to the Dzyaloshinskii-Moryia (DM) mode, and another in the B3g channel, corresponding to the XY mode. Furthermore, we show that a peak corresponding to the XY mode can be induced in the planar (RR) geometry when a magnetic field is applied along the easy axis for the sublattice magnetization. The appearance of such field-induced mode (FIM) signals the existence of a new magnetic state above the Neel temperature T_N, where the direction of the weak-ferromagnetic moment (WFM) lies within the CuO(2) planes.
description: 4 pages, 3 figures
Legal Kiffen? – Befragung der Bevölkerung zum geplanten Cannabis-Pilotversuch in Olten
Creators: name: Fabian, Carlo
name: Lienert, Pascal
name: Aerni, Nadia
name: Gerber, Simon
name: Studer, Sara
name: Ereteta, Naomi
Publisher: name: Infodrog
Year: 2023
Subjects: subject: 360 - Soziale Probleme, Sozialdienste, Versicherungen

description: Cannabis bewegt die Gemüter. Es sind politische und gesellschaftliche Diskussionen in Gange. Auf Basis einer Gesetzesänderung hat die Schweiz aktuell die Möglichkeit, legal Cannabis-Pilotversuche durchzuführen. Das Ziel der Versuche ist es, mehr über die Vor- und Nachteile eines kontrollierten Zugangs zu erfahren und eine wissenschaftliche Grundlage für eine zukünftige Regulierung von Cannabis in der Schweiz zu schaffen. Die Meinungen der lokalen Bevölkerung gegenüber einem solchen Pilotversuch, welcher in ihrer eigenen Stadt durchgeführt werden soll, wurde bisher kaum erhoben. Im Rahmen einer studentischen Arbeit an der HSA FHNW1 konnte dies nun erstmals gemacht werden.
The Supernova Remnant Population of NGC6946 as Observed in [Fe II] 1.644 $μ$m with HST
Creators: name: Long, Knox S.
name: Blair, William P.
name: Winkler, P. Frank
name: Lacey, Christina K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: NGC6946 is a high star formation rate face-on spiral galaxy that has hosted ten supernovae since 1917. Not surprisingly, a large number of supernova remnants and candidates have been identified either as optical nebulae with high [S II]:H$α$ line ratios (147) or as compact non-thermal radio sources (35). However, there are only seven overlaps between these two samples. Here, we apply [Fe II] 1.644 $μ$m emission as a new diagnostic to search for supernova remnants in an attempt to resolve this discrepancy. [Fe II] is expected to be relatively strong in the radiative shocks of supernova remnants and almost absent in HII regions. It is less susceptible to the effects of absorption along the line of sight than the optical lines normally used to identify remnants. Using data from the WFC3 camera on HST}, we identify 132 [Fe II] emission nebulae in NGC6946 as likely supernova remnants. Of these, 54 align with previously known optical supernova remnants. The remaining 78 objects are new; of these 44 are visible in new HST imagery in H$α$ and [S II]. This brings the total number of supernova remnant candidates (from optical and/or IR data) in NGC6946 to 225. A total of 14 coincidences with radio supernova remnant candidates (out of 30 in our search area) are found in this expanded list. The identification of so many new remnant candidates validates the use of [Fe II] imagery for finding remnants, and suggests that previous remnant searches in other galaxies may be far from complete.
description: 43 pages, 9 figures, 2 tables, accepted for publication in ApJ
HEDGING WITH FUTURES AND OPTIONS UNDER A TRUNCATED CASH PRICE DISTRIBUTION
Creators: name: Hanson, Steven D.
name: Myers, Robert J.
name: Hilker, James H.
name: Hanson, Steven D.
name: Myers, Robert J.
name: Hilker, James H.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: farm programs
subject: futures
subject: hedging
subject: options
subject: truncation

description: Many agricultural producers face cash price distributions that are effectively truncated at a lower limit through participation in farm programs designed to support farm prices and incomes. For example, the 1996 Federal Agricultural Improvement Act (FAIR) makes many producers eligible to obtain marketing loans which truncate their cash price realization at the loan rate, while allowing market prices to freely equilibrate supply and demand. This paper studies the effects of truncated cash price distributions on the optimal use of futures and options. The results show that truncation in the cash price distribution facing an individual producer provides incentives to trade options as well as futures. We derive optimal futures and options trading rules under options as well as futures. We derive optimal futures and options trading rules under a range of different truncation scenarios. Empirical results highlights the impacts of basis risk and yield risk on the optimal futures and options portfolio.
Overexpression of activated RAS alters cell fate determination during the development of Dictyostelium discoideum
Creators: name: Jaffer, Zahara M.
Publisher: name: University of British Columbia
Year: 2009

description: The development of Dictyostelium discoideum provides an attractive model for studying the role of Ras in cell fate determination since amoebae differentiate into one of only two cell types, stalk or spore. RasD is the predominant Ras expressed during development and it is expressed in both cell types. It was previously demonstrated that a transformant overexpressing activated RasD (Ddras- Thrl2) forms multi-tipped aggregates, is blocked from further morphogenesis, and exhibits marked changes in cell type specific gene expression. The morphological phenotype was reproduced in rasD::rasG(G12T) transformants. It was not known if the developmental defects induced by RasD(G12T) resulted from its expression in prestalk or prespore cells. Transformants expressing RasG(G12T) from the prestalk specific ecmAO promoter formed single-tipped aggregates that produced outwardly normal slugs and almost normal cell type specific gene expression. However, prestalk cells were mislocalized and terminal morphology was abnormal: stalk cells were present in basal cell masses and there were no spore cells or stalk tubes. Thus, the formation of multi-tipped aggregates and deregulated cell type specific gene expression is not a consequence of activated Ras expression in prestalk cells. Transformants expressing RasG(G12T) from the prespore specific psA promoter formed mounds with multiple tips and cell type specific gene expression was markedly altered. However, the tips extended to form finger-like and then sluglike structures which then formed stalks. Therefore, the formation of multiple tips and the deregulation of cell type specific gene expression, but not the block in morphological development, results from expression of activated Ras in prespore cells. Since limiting overexpession of activated Ras to either of the cell types did not completely recapitulate the phenotype of the Ddras-Thr12 transformant, cotransformants were generated which expressed both ecmAO::rasG(G12T) and psA::rasG(G12T). These cotransformants formed aggregates with multiple protruding tips that were blocked from further morphogenesis. Thus, when activated Ras is expressed from the rasD promoter, the developmental aberrations result from expression in both cell types.
La descente d'Innana dans le monde infernal (1.4.1)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: sumerian
Inanna
Translation
Traduction

description: Traduction La descente d'Innana dans le monde infernal (1.4.1) Pascal Attinger, 2019 aktualisiert 2021
Direct, Indirect and Collider Detection of Neutralino Dark Matter In SUSY Models with Non-universal Higgs Masses
Creators: name: Baer, Howard
name: Mustafayev, Azar
name: Profumo, Stefano
name: Belyaev, Alexander
name: Tata, Xerxes
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In supersymmetric models with gravity-mediated SUSY breaking, universality of soft SUSY breaking sfermion masses m_0 is motivated by the need to suppress unwanted flavor changing processes. The same motivation, however, does not apply to soft breaking Higgs masses, which may in general have independent masses from matter scalars at the GUT scale. We explore phenomenological implications of both the one-parameter and two-parameter non-universal Higgs mass models (NUHM1 and NUHM2), and examine the parameter ranges compatible with Omega_CDM h^2, BF(b --> s,gamma) and (g-2)_mu constraints. In contrast to the mSUGRA model, in both NUHM1 and NUHM2 models, the dark matter A-annihilation funnel can be reached at low values of tan(beta), while the higgsino dark matter annihilation regions can be reached for low values of m_0. We show that there may be observable rates for indirect and direct detection of neutralino cold dark matter in phenomenologically aceptable ranges of parameter space. We also examine implications of the NUHM models for the Fermilab Tevatron, the CERN LHC and a Sqrt(s)=0.5-1 TeV e+e- linear collider. Novel possibilities include: very light s-top_R, s-charm_R squark and slepton_L masses as well as light charginos and neutralinos and H, A and H^+/- Higgs bosons.
description: LaTeX, 48pages, 26 Figures. The version with high resolution Figures is available at http://hep.pa.msu.edu/belyaev/public/projects/nuhm/nuhm.ps
Thermalization in massive deformations of Yang-Mills matrix models
Creators: name: Oktay, Onur
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We numerically study the classical evolution of a Yang-Mills matrix model with two distinct mass deformation terms, which can be contemplated as a massive deformation of the bosonic part of the BFSS model. Through numerical analysis, it is shown that when the simulations are started from a certain set of initial conditions, thermalization occurs. Besides, an estimation method is proposed to determine the approximate thermalization time. Using this method, we demonstrate that thermalization time vary logarithmically with increasing matrix size when the mass terms differ. Introducing a matrix configuration, we also obtain reduced actions and subsequently analyze how the thermalization time change as a function of the energy.
description: 18 pages, 9 figures