cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Return on Investments for Community Infrastructure Projects? A Foundation for Rural Development Strategy.
Creators: name: Amanor-Boadu, Vincent
name: Burns, Michael
name: Amanor-Boadu, Vincent
name: Burns, Michael
Publisher: name: Unknown
Year: 2008
Subjects: subject: Community/Rural/Urban Development
subject: Public Economics
subject: Infrastructure
subject: Public Goods
subject: Rural Development
subject: Social Welfare Economics

description: With decreasing populations and declining resources, rural governments are finding it challenging determining how to make investments in their infrastructure. This paper defines the problem confronting rural governments and develops a process for making infrastructure decisions to maximize community welfare.
An Economic Analysis of Replacing Existing Bermudagrass Stands with Tifton 85 Bermudagrass for Beef Cow-Calf, Stocker and Hay Production
Creators: name: Lacy, R. Curt
name: Hill, Gary M.
name: Lacy, R. Curt
name: Hill, Gary M.
Publisher: name: Unknown
Year: 2008
Subjects: Crop Production/Industries
Risk and Uncertainty

description: Comparisons of simulated NPV for Coastal and Tifton 85 bermuda-grass using experimental data, current input prices and historical hay and feeder cattle prices indicates that many producers would benefit by adopting this new cultivar. Cow-calf producers would benefit the most followed by stocker/replacement heifer producers and finally hay producers. When risk-aversion is introduced into the model, all cow-calf and stocker producers regardless of the level of risk-aversion should consider adopting T85. Moderately or extremely risk-averse hay producers would consider adopting T85, while those that are slightly risk-averse would be indifferent.
Efficient Channel Estimation for Double-IRS Aided Multi-User MIMO System
Creators: name: Zheng, Beixiong
name: You, Changsheng
name: Zhang, Rui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: To achieve the more significant passive beamforming gain in the double-intelligent reflecting surface (IRS) aided system over the conventional single-IRS counterpart, channel state information (CSI) is indispensable in practice but also more challenging to acquire, due to the presence of not only the single- but also double-reflection links that are intricately coupled and also entail more channel coefficients for estimation. In this paper, we propose a new and efficient channel estimation scheme for the double-IRS aided multi-user multiple-input multiple-output (MIMO) communication system to resolve the cascaded CSI of both its single- and double-reflection links. First, for the single-user case, the single- and double-reflection channels are efficiently estimated at the multi-antenna base station (BS) with both the IRSs turned ON (for maximal signal reflection), by exploiting the fact that their cascaded channel coefficients are scaled versions of their superimposed lower-dimensional CSI. Then, the proposed channel estimation scheme is extended to the multi-user case, where given an arbitrary user's cascaded channel (estimated as in the single-user case), the other users' cascaded channels can also be expressed as lower-dimensional scaled versions of it and thus efficiently estimated at the BS. Simulation results verify the effectiveness of the proposed channel estimation scheme and joint training reflection design for double IRSs, as compared to various benchmark schemes.
description: Early access in IEEE TCOM(https://ieeexplore.ieee.org/document/9373363). Efficient channel estimation scheme for the double-IRS assisted uplink multi-user MIMO communication system (arXiv:2008.13701) with the "lowest training overhead". Conference version (arXiv:2010.06155)
Duopoly Competition in Supermarket Industry: The Case of Seattle-Tacoma Milk Market
Creators: name: Chidmi, Benaissa
name: Murova, Olga I.
name: Chidmi, Benaissa
name: Murova, Olga I.
Publisher: name: Unknown
Year: 2008
Subjects: Agribusiness
Demand and Price Analysis

description: The Seattle-Tacoma consumers have been paying higher prices for fresh milk than consumers in other Western states of United States. For instance, the retail price for whole milk averaged $3.27/gallon during the period of April 1999- April 2003 in Seattle-Tacoma, while it did not go beyond $2.86/gallon in most of the large metropolitan areas in Western U.S, during the same period (Carman and Sexton, 2006). In addition, retail prices in Seattle-Tacoma do not respond similarly to farm price increases and decreases. Supermarkets are prompt to pass on to consumers any increase in farm price, while they do not pass or lag behind when farm price decreases. The present study attempts to analyze the pricing conduct of supermarket chains in a duopoly setting using a structural model of consumers and firms behavior. In this paper, we examine the pricing conduct of two supermarket chains using retail supermarket-level data on sales and prices from Seattle-Tacoma market area.
Research Faculty, Entrepreneurship and Commercialization: The Case of Kansas State University
Creators: name: Amanor-Boadu, Vincent
name: Metla, Chandra Mohan Reddy
name: Amanor-Boadu, Vincent
name: Metla, Chandra Mohan Reddy
Publisher: name: Unknown
Year: 2008
Subjects: Research and Development/Tech Change/Emerging Technologies
Teaching/Communication/Extension/Profession

description: In this study, we assess the relationships between the demographic characteristics of researchers and their perspectives on entrepreneurship and the commercialization of their inventions, and analyze the relationship between faculty perceptions of university commercialization policies and their entrepreneurial orientation. We conclude that there is a need for effective educational programs to address each of the issues and increase awareness among faculty and researchers.
Experimental study of the correlation length of critical-current fluctuations in the presence of surface disorder: Probing vortex long-range interactions
Creators: name: Scola, J.
name: Pautrat, A.
name: Goupil, C.
name: Simon, Ch.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We report on critical currents and voltage noise measurements in Niobium strips in the superconducting state, in the presence of a bulk vortex lattice ($B < B_{C2}$) and in the surface superconducting state ($B_{c2}< B < B_{C3}$). For homogeneous surfaces, the correlation length of the current fluctuations can be associated with the electromagnetic skin depth of vortex superficial instabilities. The modification of the surface state by means of low energy irradiation induces a strong modification of the critical current and of the noise. The appearance of a corner frequency in the spectral domain can be linked with the low wave-vectors of the artificial corrugation. Since this latter occurs only for $B < B_{C2}$, we propose that the long-range interactions allow the correlation length to extend up to values imposed by the surface topography.
description: accepted for publication in PRB
The Value of Information in Precision Farming
Creators: name: Liu, Xuanli
name: Nelson, Macon
name: Ibrahim, Mohammed
name: Liu, Xuanli
name: Nelson, Macon
name: Ibrahim, Mohammed
Publisher: name: Unknown
Year: 2008
Subjects: Farm Management
Research and Development/Tech Change/Emerging Technologies

description: This study examines how the value of information is measured and its role in precision farming. Two types of precision farming are discussed regarding information in use and ways of information collection. Analytical equations have been derived to link the estimation of the value of information to limited parameters available.
Harmonic algebraic curves and noncrossing partitions
Creators: name: Martin, Jeremy
name: Savitt, David
name: Singer, Ted
Publisher: name: arXiv
Year: 2005
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Geometry (math.AG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 14P25, 26C10, 30C15, 05A18, 52C99

description: Motivated by Gauss's first proof of the Fundamental Theorem of Algebra, we study the topology of harmonic algebraic curves. By the maximum principle, a harmonic curve has no bounded components; its topology is determined by the combinatorial data of a noncrossing matching. Similarly, every complex polynomial gives rise to a related combinatorial object that we call a basketball, consisting of a pair of noncrossing matchings satisfying one additional constraint. We prove that every noncrossing matching arises from some harmonic curve, and deduce from this that every basketball arises from some polynomial.
description: 18 pages, 14 color figures; uses epsfig and psfrag
The Impact of Agricultural Aid on Agricultural Sector Growth
Creators: name: Kaya, Ozgur
name: Kaya, Ilker
name: Gunter, Lewell F.
name: Kaya, Ozgur
name: Kaya, Ilker
name: Gunter, Lewell F.
Publisher: name: Unknown
Year: 2008
Subjects: International Development

description: The primary objective of this study is to asses the impact of agricultural foreign aid on agricultural output in developing countries. In order to examine this effect, we will employ a cross-section time-series econometric model where we employ annual data from 1974 through 2005 for 112 developing countries that are aid recipients.
Asymptotic behavior of a metapopulation model
Creators: name: Barbour, A. D.
name: Pugliese, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 37L15, 92D40 (Primary) 34G20, 47J35, 60J27. (Secondary)

description: We study the behavior of an infinite system of ordinary differential equations modeling the dynamics of a metapopulation, a set of (discrete) populations subject to local catastrophes and connected via migration under a mean field rule; the local population dynamics follow a generalized logistic law. We find a threshold below which all the solutions tend to total extinction of the metapopulation, which is then the only equilibrium; above the threshold, there exists a unique equilibrium with positive population, which, under an additional assumption, is globally attractive. The proofs employ tools from the theories of Markov processes and of dynamical systems.
description: Published at http://dx.doi.org/10.1214/105051605000000070 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Transcription of file 025_A (collection LA 256)
Creators: name: Parker, Verdena
name: Chase, Sara
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio files VP-221016-09a/c: transcription of file 025_A (tape 25, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 8:58 to 10:59. Due to re-numbering, tape 025_A has been assigned to the CLA item number LA256.025, audio file LA256.025A.
Anomalous behavior in high-pressure carbonaceous sulfur hydride
Creators: name: Dogan, Mehmet
name: Cohen, Marvin L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A new experimental study by Snider et al. [Nature 586, 373-377 (2020)] reported behavior in a high-pressure carbon-sulfur-hydrogen system that has been interpreted by the authors as superconductivity at room temperature. The sudden drop of electrical resistance at a critical temperature and the change of the R vs. T behavior with an applied magnetic field point to superconductivity. This is a very exciting study in one of the most important areas of science, hence, it is crucial for the community to investigate these findings and hopefully reproduce these results. In this comment, we present calculations that expand upon the arguments put forth by Hirsch and Marsiglio [arXiv:2010.10307], and offer some speculations about physical mechanisms that might explain the observed data. In agreement with Hirsch and Marsiglio, we show that there are errors in the analysis presented in the experimental paper, and with the correct analysis, the reported R vs. T data significantly deviate from the expected behavior. In particular, the extremely sharp change in resistance at the superconducting transition is not consistent with a strongly type II superconductor.
Hartree-Fock-Bogolyubov calculations with Gaussian expansion method
Creators: name: Nakada, H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We extensively develop an algorithm of implementing the Hartree-Fock-Bogolyubov calculations, in which the Gaussian expansion method is employed. This algorithm is advantageous in describing the energy-dependent exponential and oscillatory asymptotics of the quasiparticle wave functions at large $r$, and in handling various effective interactions including those with finite ranges. We apply the present method to the oxygen isotopes with the Gogny interaction, keeping the spherical symmetry. In respect to the new magic numbers, effects of the pair correlation on the N=16 and 32 nuclei are investigated.
description: 22 pages including 4 figures
Demand and Supply of Crop Infraspecific Diversity on Farms: Towards a Policy Framework for On-Farm Conservation
Creators: name: Bellon, Mauricio R.
name: Bellon, Mauricio R.
Publisher: name: Unknown
Year: 2001
Subjects: Crop Production/Industries

description: Interest is increasing worldwide in on-farm conservation as a component of a strategy to conserve crop genetic resources. On-farm conservation may require outside support to small-scale farmers in areas of crop domestication and diversity. This paper argues that crop infraspecific diversity maintained by farming households in these areas results from the interplay between demand and supply for this diversity (i.e., its loss may be demand- or supply-related). In the first instance, interventions should be aimed at increasing the value of crop diversity for farmers or decreasing the farm-level opportunity costs of maintaining diversity. In the second instance, interventions should decrease the transaction costs of accessing crop diversity. It may be difficult, however, to distinguish in empirical research, whether the constraints to diversity are demand- or supply-related. Therefore the process of supporting on-farm conservation should be kept as open as possible and both demand and supply interventions should be available.
Probing the Magnetic Field at Sub-Parsec Radii in the Accretion Disk of NGC 4258
Creators: name: Modjaz, Maryam
name: Moran, James M.
name: Kondratko, Paul T.
name: Greenhill, Lincoln J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an analysis of polarimetric observations at 22 GHz of the water vapor masers in NGC 4258 obtained with the VLA and the GBT. We do not detect any circular polarization in the spectrum indicative of Zeeman-induced splitting of the maser lines of water, a non-paramagnetic molecule. We have improved the 1-sigma upper limit estimate on the toroidal component of the magnetic field in the circumnuclear disk of NGC 4258 at a radius of 0.2 pc from 300 mG to 90 mG. We have developed a new method for the analysis of spectra with blended features and derive a 1-sigma upper limit of 30 mG on the radial component of the magnetic field at a radius of 0.14 pc. Assuming thermal and magnetic pressure balance, we estimate an upper limit on the mass accretion rate of ~10^(-3.7) M_sun/yr for a total magnetic field of less than 130 mG. We discuss the ramifications of our results on current maser models proposed to explain the observed maser emission structure and the consequences for current accretion theories. We find from our magnetic field limits that the thin-disk model and the jet-disk model are better candidates for accounting for the extremely low-luminosity nature of NGC 4258, than models that include advection-dominated accretion flows.
description: 20 pages, including 10 figures and 2 tables. Accepted for publication in the Astrophysical Journal
Single- and narrow-line photoluminescence in a boron nitride-supported MoSe$_2$/graphene heterostructure
Creators: name: López, Luis E. Parra
name: Moczko, Loïc
name: Wolff, Joanna
name: Singh, Aditya
name: Lorchat, Etienne
name: Romeo, Michelangelo
name: Taniguchi, Takashi
name: Watanabe, Kenji
name: Berciaud, Stéphane
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Heterostructures made from van der Waals materials provide a template to investigate proximity effects at atomically sharp heterointerfaces. In particular, near-field charge and energy transfer in heterostructures made from semiconducting transition metal dichalcogenides (TMD) have attracted interest to design model 2D "donor-acceptor" systems and new optoelectronic components. Here, using of Raman scattering and photoluminescence spectroscopies, we report a comprehensive characterization of a molybedenum diselenide (MoSe$_2$) monolayer deposited onto hexagonal boron nitride (hBN) and capped by mono- and bilayer graphene. Along with the atomically flat hBN susbstrate, a single graphene epilayer is sufficient to passivate the MoSe$_2$ layer and provides a homogenous environment without the need for an extra capping layer. As a result, we do not observe photo-induced doping in our heterostructure and the MoSe$_2$ excitonic linewidth gets as narrow as 1.6~meV, hence approaching the homogeneous limit. The semi-metallic graphene layer neutralizes the 2D semiconductor and enables picosecond non-radiative energy transfer that quenches radiative recombination from long-lived states. Hence, emission from the neutral band edge exciton largely dominates the photoluminescence spectrum of the MoSe$_2$/graphene heterostructure. Since this exciton has a picosecond radiative lifetime at low temperature, comparable with the energy transfer time, its low-temperature photoluminescence is only quenched by a factor of $3.3 \pm 1$ and $4.4 \pm 1$ in the presence of mono- and bilayer graphene, respectively. Finally, while our bare MoSe$_2$ on hBN exhibits negligible valley polarization at low temperature and under near-resonant excitation, we show that interfacing MoSe$_2$ with graphene yields a single-line emitter with degrees of valley polarization and coherence up to $\sim 15\,\%$.
description: version 3, 5 figures
Frieling, Reinhard (hrsg.): Die Kirchen und ihre Konservativen
Creators: name: Vorster, Hans
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 33 Nr. 3 (1984): Ökumenische Rundschau, Band 33, Heft 3
On the convergence from discrete to continuous time in an optimal stopping problem
Creators: name: Dupuis, Paul
name: Wang, Hui
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 93E20, 93E35, 60J55, 90C59. (Primary)

description: We consider the problem of optimal stopping for a one-dimensional diffusion process. Two classes of admissible stopping times are considered. The first class consists of all nonanticipating stopping times that take values in [0,\infty], while the second class further restricts the set of allowed values to the discrete grid {nh:n=0,1,2,...,\infty} for some parameter h>0. The value functions for the two problems are denoted by V(x) and V^h(x), respectively. We identify the rate of convergence of V^h(x) to V(x) and the rate of convergence of the stopping regions, and provide simple formulas for the rate coefficients.
description: Published at http://dx.doi.org/10.1214/105051605000000034 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The visualization of object-oriented enterprise modeling
Creators: name: Zhang, Xu
Publisher: name: University of British Columbia
Year: 2009

description: This research work is focused on the development of a visual Computer-Aided Software Engineering (CASE) tool for Object-Oriented Enterprise Modeling (OOEM) methodology. Based on an ontological foundation, OOEM is an object-oriented analysis and design methodology that provides a set of rules for and a systematic approach to enterprise modeling. Previous research has demonstrated that the ontological rules of OOEM could be stored within a CASE tool to direct model construction and check model integrity. The thesis designs and technically implements such a CASE tool for OOEM. It explores theoretical and technical solutions to the issues identified by previous research; investigates more OOEM modeling and analysis features that could be incorporated into a visual CASE tool; and also studies empirically the usefulness and accessibility of such a tool to its intended user audience. The empirical study shows that the resulted CASE tool does help analysts to appreciate OOEM strengths and to apply the methodology with increased effectiveness and efficiency.
Farmers' Seed Selection Practices and Maize Variety Characteristics in a Traditionally-Based Mexican Community
Creators: name: Louette, Dominique
name: Smale, Melinda
name: Louette, Dominique
name: Smale, Melinda
Publisher: name: Unknown
Year: 1998
Subjects: Crop Production/Industries

description: Experimental results and farmer surveys in a Mexican community indicate that farmers' seed selection practices protect the phenological integrity of their maize varieties as they define them, despite numerous factors contributing to genetic instability. Analysis of morphological and genetic data suggests that when subjected to significant gene flow through cross-pollination, ear characteristics are maintained through farmers' selection even though other characteristics may continue to evolve genetically. Because the effects of farmers' selection practices are confined largely to ear characteristics and plant characteristics that are linked to them, their practices appear to offer only limited scope for improving varieties. Farmers' expectations of what they can achieve through seed selection are similarly modest. These findings indicate potentially complementary roles for professional breeders and Mexican farmers in developing methods to improve maize landraces on farms - if farmers themselves perceive benefits from the collaboration.
Predicting the $\bar{D}_s^{(*)} D_s^{(*)}$ bound states as the partners of $X(3872)$
Creators: name: Meng, Lu
name: Wang, Bo
name: Zhu, Shi-Lin
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this work, we investigate the SU(3) flavor symmetry, heavy quark spin symmetry and their breaking effects in the di-meson systems. We prove the existence of the $[\bar{D}_{s}^{*}D_{s}^{*}]^{0^{++}}$, $[\bar{D}_{s}^{*}D_{s}/\bar{D}_{s}^{}D_{s}^*]^{1^{+-}}$, and $[\bar{D}_{s}^{*}D_{s}^{*}]^{1^{+-}}$ bound states as the consequence of two prerequisites in the SU(3) flavor symmetry and heavy quark spin symmetry. The first prerequisite, the $X(3872)$ as the weakly $\bar{D}^{*}D/\bar{D} D^{*}$ bound state is supported by its mass and decay branching ratios. The second prerequisite, the existence of the $[\bar{D}_{s}D_{s}]^{0^{++}}$ bound state is supported by the lattice QCD calculation [arXiv:2011.02542(hep-lat)] and the observation of $χ_{c0}(3930)$ by the LHCb Collaboration[Phys.Rev.Lett.125,242001, Phys.Rev.D102,112003]. We hope the future experimental analyses can search for these bound states in the $B\to D_{(s)}^{(*)}\bar{D}^{(*)}_{(s)}h$ processes ($h$ denotes the light hadrons). The $[\bar{D}_{s}^{*}D_{s}^{*}]^{0^{++}}$ bound state is also expected to be reconstructed in the $J/ψϕ$ final state in the $B\to J/ψϕK$ decay.
description: 9 pages, 5 figures; add the coupled-channel discussions in EFT; to be published in Science Bulletin
Electroluminescence emission from polariton states in GaAs-based semiconductor microcavities
Creators: name: Khalifa, A. A.
name: Love, A. P. D.
name: Krizhanovskii, D. N.
name: Skolnick, M. S.
name: Roberts, J. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The authors report the observation of electroluminescence from GaAs-based semiconductor microcavities in the strong coupling regime. At low current densities the emission consists of two peaks, which exhibit anti-crossing behaviour as a function of detection angle and thus originate from polariton states. With increasing carrier injection we observe a progressive transition from strong to weak coupling due to screening of the exciton resonance by free carriers. The demonstration that polariton emission can be excited by electrical injection is encouraging for future development of polariton lasers.
description: 13 pages, 3 figures
Rough translation of file 027_B (collection LA 256)
Creators: name: Parker, Verdena
name: Chase, Sara
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-221016-10a: rough translation (30 second to 3-4 minute chunks) of file 027_B (tape 27, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from start to 14:38; no transcription in this session, translation only. Due to re-numbering, tape 027_B has been assigned to the CLA item number LA256.027, audio file LA256.027B.
International Collaboration in Crop Improvement Research: Current Status and Future Prospects
Creators: name: Traxler, Greg
name: Pingali, Prabhu L.
name: Traxler, Greg
name: Pingali, Prabhu L.
Publisher: name: Unknown
Year: 1999
Subjects: Crop Production/Industries
Research and Development/Tech Change/Emerging Technologies

description: Investments over the past 35 years have created a system of national and international research centers that has revolutionized the supply of improved cereal varieties to developing country farmers. The newly created scientific ability to exploit genetic resources has been the engine of productivity growth in much of world agriculture. But the success that has been attained in building research institutions has not touched all countries or farmers, nor can it be considered permanent. The financial and political environment of the past decade has halted the expansion of agricultural research capacity and the scarcity of research resources and evolving world intellectual property rights (IPR) regimes complicates the search for stable arrangements for cooperation. This paper examines the current structure and institutional capacity of the international crop breeding systems for rice and wheat. Discussions are presented within the context of a system composed of research functions spanning the basic to applied research spectrum. The model emphasizes that an efficient and stable international system may be comprised of many partner institutions, each with a limited breadth of research activities, particularly when research budgets are fixed or declining. The paper concludes with a review of some of the trends that will influence the future direction of research cooperation.
The Private and Public Characteristics of Maize Land Races and the Area Allocation Decisions of Farmers in a Center of Crop Diversity
Creators: name: Smale, Melinda
name: Bellon, Mauricio R.
name: Gomez, Jose Alfonso Aguirre
name: Smale, Melinda
name: Bellon, Mauricio R.
name: Gomez, Jose Alfonso Aguirre
Publisher: name: Unknown
Year: 1999
Subjects: Crop Production/Industries

description: This study uses an approach derived from models of the private and public characteristics of goods to illustrate (1) the overriding importance of variety attributes in farmers' decisions to allocate area among varieties of maize landraces and (2) the significance of farmers' perceptions of changes in the maize germplasm base in the surrounding community in their choices. Diversity indices and the concept of 'scale', as understood in ecology, are adapted and employed to test hypotheses empirically. Though a case study of maize farmers in Southeastern Guanajuato, the research raises methodological issues for models of variety choice and has policy implications for the potential to conserve maize genetic diversity on farms in Mexico.
Lorentz-Violating Electromagnetostatics
Creators: name: Bailey, Quentin G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this talk, the stationary limit of Lorentz-violating electrodynamics is discussed. As illustrated by some simple examples, the general solution includes unconventional mixing of electrostatic and magnetostatic effects. I discuss a high-sensitivity null-type measurement, exploiting Lorentz-violating electromagnetostatic effects, that could improve existing limits on parity-odd coefficients for Lorentz violation in the photon sector.
description: 6 pages, presented at the Third Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, August 2004
Language lessons: questions and commands
Creators: name: Parker, Verdena
name: Chase, Sara
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio files VP-221016-07 and VP-221016-08: language lessons: commands; also some verbs with 3rd person (VP-221016-07) and questions (VP-221016-08).
Bound states of WIMP dark matter in Higgs-portal models. Part I. Cross-sections and transition rates
Creators: name: Oncala, Ruben
name: Petraki, Kalliopi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the role of the Higgs \emph{doublet} in the thermal decoupling of multi-TeV dark matter coupled to the Weak interactions of the Standard Model and the Higgs. The Higgs doublet can mediate a long-range force that affects the annihilation processes and binds dark matter into bound states. More importantly, the emission of a Higgs doublet by a pair of dark matter particles can give rise to extremely rapid monopole bound-state formation processes and bound-to-bound transitions. We compute these effects in the unbroken electroweak phase. To this end, we consider the simplest renormalisable fermionic model, consisting of a singlet and a doublet under $SU_{L}(2)$ that are stabilised by a $\mathbb{Z}_2$ symmetry, in the regime where the two multiplets coannihilate. In a companion paper, we use the results to show that the formation of metastable bound states via Higgs-doublet emission and their decay decrease the relic density very significantly.
description: v1: 65 pages, 16 figures, 10 tables; v2: minor changes, published version
On the challenges of searching for GeV-scale long-lived particles at the LHC
Creators: name: Bernreuther, Elias
name: Mejia, Juliana Carrasco
name: Kahlhoefer, Felix
name: Krämer, Michael
name: Tunney, Patrick
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Many models of dark matter predict long-lived particles (LLPs) that can give rise to striking signatures at the LHC. Existing searches for displaced vertices are however tailored towards heavy LLPs. In this work we show that this bias severely affects their sensitivity to LLPs with masses at the GeV scale. To illustrate this point we consider two dark sector models with light LLPs that decay hadronically: a strongly-interacting dark sector with long-lived exotic mesons, and a Higgsed dark sector with a long-lived dark Higgs boson. We study the sensitivity of an existing ATLAS search for displaced vertices and missing energy in these two models and find that current track and vertex cuts result in very low efficiency for light LLPs. To close this gap in the current search programme we suggest two possible modifications of the vertex reconstruction and the analysis cuts. We calculate projected exclusion limits for these modifications and show that they greatly enhance the sensitivity to LLPs with low mass or short decay lengths.
description: 19 pages, 9 figures; v2 matches published version
Understanding Global Trends in the Use of Wheat Diversity and International Flows of Wheat Genetic Resources
Creators: name: Smale, Melinda
name: Smale, Melinda
Publisher: name: Unknown
Year: 1996
Subjects: Crop Production/Industries

description: This paper discusses the centers of origin and diversity for bread wheat; sketches historical patterns in the sources and use of wheat genetic resources in modern plant breeding; identifies and compares indicators of genetic diversity used by social and biological scientists; reviews the relationship of wheat genetic diversity to yield stability and vulnerability to disease; develops a profile of the structure of genetic variation in wheat in the developing world today; and investigates how scientific plant breeding has influenced the structure of genetic variation among the major bread wheats grown in developing countries. Modern plant breeding appears to have contributed to genetic variation in several ways. The number of different landraces in pedigrees has steadily increased over the past 30 years, and the geographical origins of the landraces have broadened. The pedigree complexity of the more successful cultivars planted in the developing world has grown over time. Yield stability, both in terms of the performance of individual lines and in terms of regional yields, on farms, appears to have increased in the past decades. The diversity that confers resistance to the wheat rusts has also increased. Diversity over space and time varies among regions of the developing world. Spatial diversity, measured as the percentage area sown to leading modern cultivars, is lowest in West Asia and highest in Mexico/Guatemala. Temporal diversity is highest in Mexico/Guatemala, lowest in North Africa, and also fairly low in South Asia. However, both spatial and temporal diversity are fairly high for many developing countries compared to some of the major industrialized producers, such as Canada. Latent diversity, calculated from pedigree analysis, is fairly high across the developing world and does not appear lower than in the major industrialized wheat producers. Genetic distance measures calculated from genealogies demonstrate the comparative diversity among the top 10 bread wheats grown in West Asia and the marked similarity of wheats grown in Mexico/Guatemala and Canada. Numerous socioeconomic factors, which future research must examine more closely, have shaped the structure of genetic variation in farmers' fields. These factors are related to the adoption and diffusion of new varieties and include pricing policies for seed and associated inputs, and the structure of the seed multiplication and distribution system.
Simple and maximally robust processes with no classical common-cause or direct-cause explanation
Creators: name: Nery, Marcello
name: Quintino, Marco Túlio
name: Guérin, Philippe Allard
name: Maciel, Thiago O.
name: Vianna, Reinaldo O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Guided by the intuition of coherent superposition of causal relations, recent works presented quantum processes without classical common-cause and direct-cause explanation, that is, processes which cannot be written as probabilistic mixtures of quantum common-cause and quantum direct-cause relations (CCDC). In this work, we analyze the minimum requirements for a quantum process to fail to admit a CCDC explanation and present "simple" processes, which we prove to be the most robust ones against general noise. These simple processes can be realized by preparing a maximally entangled state and applying the identity quantum channel, thus not requiring an explicit coherent mixture of common-cause and direct-cause, exploiting the possibility of a process to have both relations simultaneously. We then prove that, although all bipartite direct-cause processes are bipartite separable operators, there exist bipartite separable processes which are not direct-cause. This shows that the problem of deciding weather a process is direct-cause process is not equivalent to entanglement certification and points out the limitations of entanglement methods to detect non-classical CCDC processes. We also present a semi-definite programming hierarchy that can detect and quantify the non-classical CCDC robustnesses of every non-classical CCDC process. Among other results, our numerical methods allow us to show that the simple processes presented here are likely to be also the maximally robust against white noise. Finally, we explore the equivalence between bipartite direct-cause processes and bipartite processes without quantum memory, to present a separable process which cannot be realized as a process without quantum memory.
description: 24+8 pages, 11 figures. Code available at https://github.com/marcellongvb/non_ccdc_processes
A Regional Analysis of Maize Biological Diversity in Southeastern Guanajuato, Mexico
Creators: name: Gomez, Jose Alfonso Aguirre
name: Bellon, Mauricio R.
name: Smale, Melinda
name: Gomez, Jose Alfonso Aguirre
name: Bellon, Mauricio R.
name: Smale, Melinda
Publisher: name: Unknown
Year: 1998
Subjects: Crop Production/Industries

description: Four environments with contrasting potential for agricultural productivity and infrastructure development were identified in Guanajuato State, Mexico, to test hypotheses about the relationship of maize biological diversity to the region's potential for agricultural productivity and infrastructure development. Samples of all types of maize grown by a random sample of farmers were collected from each environment. The maize samples were classified by race, racial mixture, or type of 'creolized' or improved variety. Landraces were the dominant maize class in all four environments; the use of improved varieties was negligible. Several diversity indices were calculated, and no statistically significant differences were apparent between the environments with the most contrasting agroecological and infrastructural conditions. Statistical differences in diversity are apparent when the development of infrastructure interacts with agroecological factors in an environment. Qualitative data suggest that the richness of maize populations may be associated with maize yield potential in a geographical area, whereas the evenness of maize populations may be associated with the presence of infrastructure. These findings suggest further hypotheses about regional patterns of maize diversity.
Modeling photo-detectors in quantum optics
Creators: name: Rohde, Peter P.
name: Ralph, Timothy C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Photo-detection plays a fundamental role in experimental quantum optics and is of particular importance in the emerging field of linear optics quantum computing. Present theoretical treatment of photo-detectors is highly idealized and fails to consider many important physical effects. We present a physically motivated model for photo-detectors which accommodates for the effects of finite resolution, bandwidth and efficiency, as well as dark-counts and dead-time. We apply our model to two simple well known applications, which illustrates the significance of these characteristics.
description: 8 pages, 7 figures
McDonnell, Kilian (hrsg.): Documents on the charismatic renewal
Creators: name: Pfisterer, Karl Dieterich
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 33 Nr. 3 (1984): Ökumenische Rundschau, Band 33, Heft 3
Feedback control of spin systems
Creators: name: Altafini, Claudio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The feedback stabilization problem for ensembles of coupled spin 1/2 systems is discussed from a control theoretic perspective. The noninvasive nature of the bulk measurement allows for a fully unitary and deterministic closed loop. The Lyapunov-based feedback design presented does not require spins that are selectively addressable. With this method, it is possible to obtain control inputs also for difficult tasks, like suppressing undesired couplings in identical spin systems.
description: 16 pages, 15 figures
Precision SMEFT bounds from the VBF Higgs at high transverse momentum
Creators: name: Araz, Jack Y.
name: Banerjee, Shankha
name: Gupta, Rick S.
name: Spannowsky, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We study the production of Higgs bosons at high transverse momenta via vector-boson fusion (VBF) in the Standard Model Effective Field Theory (SMEFT). We find that contributions from four independent operator combinations dominate in this limit. These are the same `high energy primaries' that control high energy diboson processes, including Higgs-strahlung. We perform detailed collider simulations for the diphoton decay mode of the Higgs boson as well as the three final states arising from the ditau channel. Using the quadratic growth of the SMEFT contributions relative to the Standard Model (SM) contribution, we project very stringent bounds on these operators that far surpass the corresponding bounds from the LEP experiment.
description: 27 pages, 12 figures. Accepted version for publication in JHEP
Phosphorus-Functionalised Carbyne Complexes
Creators: name: Colebatch, Annie
Publisher: name: The Australian National University
Year: 2015

description: This thesis describes the study of tungsten complexes bearing phosphorusfunctionalised carbyne ligands. The development of two generalised synthetic routes towards phosphinocarbyne complexes is presented. The further functionalisation and derivatisation of these phosphinocarbyne complexes highlights their synthetic versatility.
title: Walter Hofmann-Schwarzer, Dr. rer. nat., 27. Februar 1890 - 20. Juni 1962
title: Gedenkfeier im Krematorium in Zürich anlässlich der Bestattung Freitag, den 22. Juni 1962
titleType: Subtitle
Creators: name: Linsi, Ernst
name: Wiesendanger, Albert
name: Bendel, Bruno
Publisher: name: Gedenkschriften-Verlag
Year: 1962
Subjects: subject: 920 Biografien, Genealogie, Insignien
subject: Nachruf
subject: Hofmann, Walter
subject: Zürich

description: Inhalt: Abdankungsansprache von Ernst Linsi, Pfarrer an der Kirche zu St. Jakob in Zürich ; Ansprache von Dr. iur. Albert Wiesendanger ; Ansprache von Bruno Bendel, Dipl. Ing.
Three-Body Effective Potential in General Relativity at Second Post-Minkowskian Order and Resulting Post-Newtonian Contributions
Creators: name: Loebbert, Florian
name: Plefka, Jan
name: Shi, Canxin
name: Wang, Tianheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the Post-Minkowskian (PM) and Post-Newtonian (PN) expansions of the gravitational three-body effective potential. At order 2PM a formal result is given in terms of a differential operator acting on the maximal generalized cut of the one-loop triangle integral. We compute the integral in all kinematic regions and show that the leading terms in the PN expansion are reproduced. We then perform the PN expansion unambiguously at the level of the integrand. Finding agreement with the 2PN three-body potential after integration, we explicitly present new $G^2v^4$-contributions at order 3PN and outline the generalization to $G^2v^{2n}$. The integrals that represent the essential input for these results are obtained by applying the recent Yangian bootstrap directly to their $ε$-expansion around three dimensions. The coordinate space Yangian generator that we employ to obtain these integrals can be understood as a special conformal symmetry in a dual momentum space.
description: 15 pages, 5 figures, 1 ancillary machine-readable file, v2: minor improvements and additions, title adapted to journal title
KP integrability of triple Hodge integrals. II. Generalized Kontsevich matrix model
Creators: name: Alexandrov, Alexander
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 37K10, 14N35, 81R10, 14N10, 81T32

description: In this paper we introduce a new family of the KP tau-functions. This family can be described by a deformation of the generalized Kontsevich matrix model. We prove that the simplest representative of this family describes a generating function of the cubic Hodge integrals satisfying the Calabi-Yau condition, and claim that the whole family describes its generalization for the higher spin cases. To investigate this family we construct a new description of the Sato Grassmannian in terms of a canonical pair of the Kac-Schwarz operators.
description: 83 pages, journal version
A Physical Model for the Origin of Quasar Lifetimes
Creators: name: Hopkins, Philip F.
name: Hernquist, Lars
name: Martini, Paul
name: Cox, Thomas J.
name: Robertson, Brant
name: Di Matteo, Tiziana
name: Springel, Volker
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We propose a model of quasar lifetimes in which observational quasar lifetimes and an intrinsic lifetime of rapid accretion are strongly distinguished by the physics of obscuration by surrounding gas and dust. Quasars are powered by gas funneled to galaxy centers, but for a large part of the accretion lifetime are heavily obscured by the large gas densities powering accretion. In this phase, starbursts and black hole growth are fueled but the quasar is buried. Eventually, feedback from accretion energy disperses surrounding gas, creating a window in which the black hole is observable optically as a quasar, until accretion rates drop below those required to maintain a quasar luminosity. We model this process and measure the unobscured and intrinsic quasar lifetimes in a hydrodynamical simulation of a major galaxy merger. The source luminosity is determined from the black hole accretion rate, calculated from local gas properties. We calculate the column density of hydrogen to the source along multiple lines of sight and use these column densities and gas metallicities to determine B-band attenuation of the source. Defining the observable quasar lifetime as the total time with an observed B-band luminosity above some limit L_B,min, we find lifetimes ~10-20 Myr for L_B,min=10^11 L_sun (M_B=-23), in good agreement with observationally determined quasar lifetimes. This is significantly smaller than the intrinsic lifetime ~100 Myr obtained if attenuation is neglected. The ratio of observed to intrinsic lifetime is also strong function of both the limiting luminosity and the observed frequency.
description: 5 pages, 4 figures, submitted to ApJ Letters