cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fishing strategies of small-scale fishers and their implications for fisheries management
Creators: name: Salas, S. (Silvia)
Publisher: name: University of British Columbia
Year: 2009

description: A comparative study was undertaken to evaluate the fishing strategies of small-scale fishers from three ports in Yucatan, Mexico. Fishers from the area exploit the same resources and are constrained by similar regulations and environmental conditions, so it could be expected that they would use similar fishing strategies. However, the results show differences among and within ports in catch profiles and strategies, which are: switching behavior, changes in fishing efficiency, and-working in cooperation teams. Although some fishers claimed to specialize in lobsters, switching behavior between alternative species was commonly observed in all three ports throughout the year. To test hypotheses associated with switching behavior, I used a discrete choice model. The results indicate that fishers' decisions were not randomly defined; resource abundance and revenues from the previous trip were significant in the selection of target species for the following trip. Differences among fishers were evident in terms of fishing efficiency and fishers' performance. In Sisal, fishers appeared to be more homogeneous than in other ports. However, in Dzilam Bravo, differences between the more efficient fishers and the 'average' were tenfold. Multiple regression analysis showed that catch rates and landed values were associated with the number of trips undertaken within a fishing season in all ports. In the other ports, fishers' experience, fishers' age, boat size, and motor power were also associated with this variation. A distinct strategy observed only in Dzilam Bravo was cooperation among fishers, where two or more fishers equally shared their catches. This strategy appears to be adopted in response to uncertain weather conditions. To summarise the results, I present a conceptual framework that illustrates how knowledge of fishing strategies could help managers to incorporate fishers' dynamics into the design of management schemes. The results of the analyses undertaken in this study indicate that current management regulations in Yucatan could be misleading since they do not account for fishers' strategies. I stress the importance of evaluating fishers' strategies as they can provide useful information for fine-tuning models in fisheries assessment, help in the implementation of development programs in fishing communities, and provide inputs for management plans.
US CONSUMER PREFERENCE FOR DOMESTIC CORN-FED VERSUS INTERNATIONAL GRASS-FED BEEF
Creators: name: Umberger, Wendy J.
name: Feuz, Dillon M.
name: Calkins, Chris R.
name: Killinger, Karen M.
name: Umberger, Wendy J.
name: Feuz, Dillon M.
name: Calkins, Chris R.
name: Killinger, Karen M.
Publisher: name: Unknown
Year: 2001
Subjects: Consumer/Household Economics
Demand and Price Analysis

description: This paper was presented at the INTERNATIONAL TRADE IN LIVESTOCK PRODUCTS SYMPOSIUM in Auckland, New Zealand, January 18-19, 2001. The Symposium was sponsored by: the International Agricultural Trade Research Consortium, the Venture Trust, Massey University, New Zealand, and the Centre for Applied Economics and Policy Studies, Massey University. Dietary changes, especially in developing countries, are driving a massive increase in demand for livestock products. The objective of this symposium was to examine the consequences of this phenomenon, which some have even called a "revolution." How are dietary patterns changing, and can increased demands for livestock products be satisfied from domestic resources? If so, at what cost? What will be the flow-on impacts, for example, in terms of increased demands for feedgrains and the pressures for change within marketing systems? A supply-side response has been the continued development of large-scale, urban-based industrial livestock production systems that in many cases give rise to environmental concerns. If additional imports seem required, where will they originate and what about food security in the importing regions? How might market access conditions be re-negotiated to make increased imports achievable? Other important issues discussed involved food safety, animal health and welfare and the adoption of biotechnology, and their interactions with the negotiation of reforms to domestic and trade policies. Individual papers from this conference are available on AgEcon Search. If you would like to see the complete agenda and set of papers from this conference, please visit the IATRC Symposium web page at: http://www1.umn.edu/iatrc.intro.htm
POLICY AND MANAGEMENT LESSONS FOR DAIRY EXPORTERS AND INVESTORS IN FOREIGN DAIRY-FOOD BUSINESSES--WHAT DID WE LEARN IN THE PAST DECADE?
Creators: name: Dobson, William D.
name: Dobson, William D.
Publisher: name: Unknown
Year: 2001
Subjects: International Relations/Trade

description: This paper was presented at the INTERNATIONAL TRADE IN LIVESTOCK PRODUCTS SYMPOSIUM in Auckland, New Zealand, January 18-19, 2001. The Symposium was sponsored by: the International Agricultural Trade Research Consortium, the Venture Trust, Massey University, New Zealand, and the Centre for Applied Economics and Policy Studies, Massey University. Dietary changes, especially in developing countries, are driving a massive increase in demand for livestock products. The objective of this symposium was to examine the consequences of this phenomenon, which some have even called a "revolution." How are dietary patterns changing, and can increased demands for livestock products be satisfied from domestic resources? If so, at what cost? What will be the flow-on impacts, for example, in terms of increased demands for feedgrains and the pressures for change within marketing systems? A supply-side response has been the continued development of large-scale, urban-based industrial livestock production systems that in many cases give rise to environmental concerns. If additional imports seem required, where will they originate and what about food security in the importing regions? How might market access conditions be re-negotiated to make increased imports achievable? Other important issues discussed involved food safety, animal health and welfare and the adoption of biotechnology, and their interactions with the negotiation of reforms to domestic and trade policies. Individual papers from this conference are available on AgEcon Search. If you would like to see the complete agenda and set of papers from this conference, please visit the IATRC Symposium web page at: http://www1.umn.edu/iatrc.intro.htm
JAPANESE IMPORT DEMAND FOR US BEEF AND PORK: EFFECTS ON US RED MEAT EXPORTS AND LIVESTOCK PRICES
Creators: name: Miljkovic, Dragan
name: Marsh, John M.
name: Brester, Gary W.
name: Miljkovic, Dragan
name: Marsh, John M.
name: Brester, Gary W.
Publisher: name: Unknown
Year: 2001
Subjects: Demand and Price Analysis
International Relations/Trade

description: This paper was presented at the INTERNATIONAL TRADE IN LIVESTOCK PRODUCTS SYMPOSIUM in Auckland, New Zealand, January 18-19, 2001. The Symposium was sponsored by: the International Agricultural Trade Research Consortium, the Venture Trust, Massey University, New Zealand, and the Centre for Applied Economics and Policy Studies, Massey University. Dietary changes, especially in developing countries, are driving a massive increase in demand for livestock products. The objective of this symposium was to examine the consequences of this phenomenon, which some have even called a "revolution." How are dietary patterns changing, and can increased demands for livestock products be satisfied from domestic resources? If so, at what cost? What will be the flow-on impacts, for example, in terms of increased demands for feedgrains and the pressures for change within marketing systems? A supply-side response has been the continued development of large-scale, urban-based industrial livestock production systems that in many cases give rise to environmental concerns. If additional imports seem required, where will they originate and what about food security in the importing regions? How might market access conditions be re-negotiated to make increased imports achievable? Other important issues discussed involved food safety, animal health and welfare and the adoption of biotechnology, and their interactions with the negotiation of reforms to domestic and trade policies. Individual papers from this conference are available on AgEcon Search. If you would like to see the complete agenda and set of papers from this conference, please visit the IATRC Symposium web page at: http://www1.umn.edu/iatrc.intro.htm
TRADE LIBERALIZATION IN THE INTERNATIONAL PORK SECTOR: ANALYSIS OF ZERO-FOR-ZERO OPTION
Creators: name: Meilke, Karl D.
name: Hayes, Dermot J.
name: Surry, Yves R.
name: Fabiosa, Jacinto F.
name: Fuller, Frank H.
name: Meilke, Karl D.
name: Hayes, Dermot J.
name: Surry, Yves R.
name: Fabiosa, Jacinto F.
name: Fuller, Frank H.
Publisher: name: Unknown
Year: 2001
Subjects: International Relations/Trade

description: This paper was presented at the INTERNATIONAL TRADE IN LIVESTOCK PRODUCTS SYMPOSIUM in Auckland, New Zealand, January 18-19, 2001. The Symposium was sponsored by: the International Agricultural Trade Research Consortium, the Venture Trust, Massey University, New Zealand, and the Centre for Applied Economics and Policy Studies, Massey University. Dietary changes, especially in developing countries, are driving a massive increase in demand for livestock products. The objective of this symposium was to examine the consequences of this phenomenon, which some have even called a "revolution." How are dietary patterns changing, and can increased demands for livestock products be satisfied from domestic resources? If so, at what cost? What will be the flow-on impacts, for example, in terms of increased demands for feedgrains and the pressures for change within marketing systems? A supply-side response has been the continued development of large-scale, urban-based industrial livestock production systems that in many cases give rise to environmental concerns. If additional imports seem required, where will they originate and what about food security in the importing regions? How might market access conditions be re-negotiated to make increased imports achievable? Other important issues discussed involved food safety, animal health and welfare and the adoption of biotechnology, and their interactions with the negotiation of reforms to domestic and trade policies. Individual papers from this conference are available on AgEcon Search. If you would like to see the complete agenda and set of papers from this conference, please visit the IATRC Symposium web page at: http://www1.umn.edu/iatrc.intro.htm
LONG-TERM PROJECTIONS OF CHINA'S SUPPLY AND DEMAND OF ANIMAL FEEDSTUFFS
Creators: name: Simpson, James R.
name: Li, Ou
name: Simpson, James R.
name: Li, Ou
Publisher: name: Unknown
Year: 2001
Subjects: Demand and Price Analysis
Production Economics

description: This paper was presented at the INTERNATIONAL TRADE IN LIVESTOCK PRODUCTS SYMPOSIUM in Auckland, New Zealand, January 18-19, 2001. The Symposium was sponsored by: the International Agricultural Trade Research Consortium, the Venture Trust, Massey University, New Zealand, and the Centre for Applied Economics and Policy Studies, Massey University. Dietary changes, especially in developing countries, are driving a massive increase in demand for livestock products. The objective of this symposium was to examine the consequences of this phenomenon, which some have even called a "revolution." How are dietary patterns changing, and can increased demands for livestock products be satisfied from domestic resources? If so, at what cost? What will be the flow-on impacts, for example, in terms of increased demands for feedgrains and the pressures for change within marketing systems? A supply-side response has been the continued development of large-scale, urban-based industrial livestock production systems that in many cases give rise to environmental concerns. If additional imports seem required, where will they originate and what about food security in the importing regions? How might market access conditions be re-negotiated to make increased imports achievable? Other important issues discussed involved food safety, animal health and welfare and the adoption of biotechnology, and their interactions with the negotiation of reforms to domestic and trade policies. Individual papers from this conference are available on AgEcon Search. If you would like to see the complete agenda and set of papers from this conference, please visit the IATRC Symposium web page at: http://www1.umn.edu/iatrc.intro.htm
TEXTILE MANUFACTURERS' MARKET VALUATION OF COTTON FIBER ATTRIBUTES
Creators: name: Chen, Changping
name: Ethridge, Don E.
name: Fletcher, Stanley M.
name: Chen, Changping
name: Ethridge, Don E.
name: Fletcher, Stanley M.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Cotton
subject: Fiber attributes
subject: Hedonic prices
subject: Regional differences

description: This study provides an analysis of the price-quality relationships of U.S. cotton using primary data collected from textile manufacturers, the end users of fiber. Hedonic prices of fiber attributes are estimated for three production regions - West, South Central, and South - over the 1992-95 study period. Results indicate that cotton price is determined by quality attributes and nonquality factors in the end-use market. There are similarities and differences in valuation of fiber attributes based on region of origin of the cotton.
COMPETITIVE STRATEGIES OF BIOTECHNOLOGY FIRMS: IMPLICATIONS FOR U.S. AGRICULTURE
Creators: name: Begemann, Brett D.
name: Begemann, Brett D.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Research and Development/Tech Change/Emerging Technologies
subject: Biotechnology
subject: Monsanto
subject: Strategies

description: The agricultural biotechnology industry has evolved from a focus on outstanding science to a more mature phase where firms focus on near-term products and building businesses. Understanding complex relationships and distribution channels and a global perspective are crucial to commercialization. Yet, leading-edge technology and early identification of key traits will be critical to developing superior products that ensure competitiveness in the marketplace. Monsanto is organizing around a life sciences model where seed, crop chemicals, pharmaceuticals, and food ingredient businesses will exploit mutual synergies driven by basic science and discovery.
DEVELOPMENT OF ENVIRONMENTAL INDICATORS FOR USE IN MACROECONOMIC MODELS
Creators: name: Kellogg, Robert L.
name: Goss, Don W.
name: Kellogg, Robert L.
name: Goss, Don W.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Environmental Economics and Policy
subject: Environmental indicators
subject: Multidisciplinary research
subject: Pesticide leaching
subject: Pesticide runoff

description: In the fields of agriculture and resource economics, good economics is predicated by good science. By partnering more with physical scientists, economists will be better able to provide the broad policy-making community with practical recommendations for addressing resource issues. An example of collaboration is presented for the development of environmental indicators of the potential risk to the environment of the loss of pesticides from farm fields, which will be used by economists to adjust conventionally measured agricultural output for water quality impacts associated with agricultural production.
A Chiral Perturbation Expansion for Gravity
Creators: name: Abou-Zeid, M.
name: Hull, C. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A formulation of Einstein gravity, analogous to that for gauge theory arising from the Chalmers-Siegel action, leads to a perturbation theory about an asymmetric weak coupling limit that treats positive and negative helicities differently. We find power counting rules for amplitudes that suggest the theory could find a natural interpretation in terms of a twistor-string theory for gravity with amplitudes supported on holomorphic curves in twistor space.
description: 11 pages, LaTeX, no figures; v2: one reference added
ECONOMIC AND ENVIRONMENTAL EFFECTS ASSOCIATED WITH REDUCING THE USE OF ATRAZINE: AN EXAMPLE OF CROSS-DISCIPLINARY RESEARCH
Creators: name: Ribaudo, Marc
name: Hurley, Terrance M.
name: Ribaudo, Marc
name: Hurley, Terrance M.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Crop Production/Industries
subject: Atrazine
subject: Deductive research
subject: Environmental exposure
subject: Herbicides
subject: Inductive research
subject: Welfare

description: Restricting or eliminating the use of atrazine in the Midwest would have important economic consequences for farmers, consumers, and the environment. These consequences can only be evaluated with cooperation between economists and weed scientists. The weed control choice set available to farmers cannot be observed through deductive research. Economists and weed scientists worked together to identify all possible weed control strategies for corn and sorghum in the Midwest and to incorporate them into an economic model. An atrazine ban was found to be the costliest strategy, and a targeted, water-quality based strategy the most cost effective.
ECOSYSTEM MANAGEMENT AND THE FLORIDA EVERLADES: THE ROLE OF SOCIAL SCIENTISTS
Creators: name: Milon, J. Walter
name: Kiker, Clyde F.
name: Lee, Donna J.
name: Milon, J. Walter
name: Kiker, Clyde F.
name: Lee, Donna J.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Resource /Energy Economics and Policy
subject: Adaptive management
subject: Ecosystem management
subject: Florida Everglades
subject: Interdisciplinary research
subject: Social science

description: Recently many state and federal agencies in the U.S. have embraced an ecosystems management approach to environmental protection and regulation. This approach requires a high degree of cooperation between natural and social scientists to translate policy objectives into research hypotheses, models, and evaluation procedures to guide implementation decisions. An adaptive procedure to guide interdisciplinary research is described and illustrated with highlights of recent progress and pitfalls from the restoration initiative for the Everglades/South Florida ecosystem.
Spectroscopy of the Kondo Problem in a Box
Creators: name: Kaul, Ribhu K.
name: Zaránd, Gergely
name: Chandrasekharan, Shailesh
name: Ullmo, Denis
name: Baranger, Harold U.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Motivated by experiments on double quantum dots, we study the problem of a single magnetic impurity confined in a finite metallic host. We prove an exact theorem for the ground state spin, and use analytic and numerical arguments to map out the spin structure of the excitation spectrum of the many-body Kondo-correlated state, throughout the weak to strong coupling crossover. These excitations can be probed in a simple tunneling-spectroscopy transport experiment; for that situation we solve rate equations for the conductance.
description: 4 pages, 4 figures
Situations and Problems of Older Rural Youth
Creators: name: Taylor, Carl C.
Publisher: name: Unknown
Year: 1940
Subjects: Community/Rural/Urban Development
Labor and Human Capital

description: Excerpts: Most of our studies of rural youth in recent years have concerned themselves with what rural youth think and want. This is important, but I am not going to spend much time discussing the data developed in numerous studies in that field. Other studies have thoroughly analyzed the ratio of rural youth to the remainder of the rural population and the ratio of rural youth to the total youth of the Nation. I shall use the results of these studies, but shall make only such use of the statistics developed in them as will set the task of wrestling with the problems which these statistics reveal. From almost every angle youth are the most important issue in American agriculture, first, because they are the greatest concern of farmers and their wives; second, because there are so many of them; and third, because we don't know what to do about them or for them. We are worried about agricultural surpluses, but our greatest surplus is rural youth. My whole text is stated in those first two sentences, and I shall spend the remainder of my time in expounding that text.
description: Address, Association of Land Grant Colleges and Universities, Chicago, Illinois, November 12, 1940.
Bose-Einstein momentum correlations at fixed multiplicities: Lessons from an exactly solvable thermal model for $pp$ collisions at the LHC
Creators: name: Adzhymambetov, M. D.
name: Akkelin, S. V.
name: Sinyukov, Yu. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Two-particle momentum correlations of $N$ identical bosons are studied in the quantum canonical ensemble. We define the latter as a properly selected subensemble of events associated with the grand canonical ensemble which is characterized by a constant temperature and a harmonic-trap chemical potential. The merits of this toy model are that it can be solved exactly, and that it demonstrates some interesting features revealed recently in small systems created in $p+p$ collisions at the LHC. We find that partial coherence can be observed in particle emission from completely thermal ensembles of events if instead of inclusive measurements one studies the two-boson distribution functions related to the events with particle numbers selected in some fixed multiplicity bins. The corresponding coherence effects increase with the multiplicity.
description: 22 pages, 6 figures, typos fixed
A lattice calculation of the pion form factor with Ginsparg-Wilson-type fermions
Creators: name: Capitani, Stefano
name: Gattringer, Christof
name: Lang, C. B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Results for Monte Carlo calculations of the electromagnetic vector and scalar form factors of the pion in a quenched simulation are presented. We work with two different lattice volumes up to a spatial size of 2.4 fm at a lattice spacing of 0.148 fm. The pion form factors in the space-like region are determined for pion masses down to 340 MeV.
description: REVTeX 4, 8 pages, 9 figures, 4 tables; final version
Registration-basedIPO Reform and A-Share Pricing Efficiency in China: An Empirical Analysis of IPO Underpricing on ChiNext Board and Main Board
Creators: name: chen, yuan
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 380107
subject: Financial economics

description: Our study addresses a crucial facet of China's financial market reforms, specifically the transition to a registration-based IPO system, which marks a pivotal change in the regulatory landscape.The main contents and contributions of this paper are as below.Utilizing comprehensive data from all ChiNext IPOs from 2018 to 2023, we developed a multiple regression model to assess the effectiveness of the reform in reducing IPO underpricing. Our findings indicate that while the reform has intensified secondary market underpricing due to heightened investor sentiment, it has notably decreased primary market underpricing, ultimately reducing overall IPO underpricing.
Spin-selective resonant tunneling induced by Rashba spin-orbit interaction in semiconductor nanowire
Creators: name: Pawłowski, J.
name: Skowron, G.
name: Szumniak, P.
name: Bednarek, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider a single electron confined within a quantum wire in a system of two electrostatically-induced QDs defined by nearby gates. The time-varying electric field, of single GHz frequency, perpendicular to the quantum wire, is used to induce the Rashba coupling and enable spin-dependent resonant tunneling of the electron between two adjacent potential wells with fidelity over 99.5%. This effect can be used for the high fidelity all-electrical electron-spin initialization or readout in the spin-based quantum computer. In contrast to other spin initialization methods, our technique can be performed adiabatically without increase in the energy of the electron. Our simulations are supported by a realistic self-consistent time-dependent Poisson-Schroedinger calculations.
description: 7 pages, 3 figures
Strain Tunable Berry Curvature Dipole, Orbital Magnetization and Nonlinear Hall Effect in WSe2 Monolayer
Creators: name: Qin, Mao-Sen
name: Zhu, Peng-Fei
name: Ye, Xing-Guo
name: Xu, Wen-Zheng
name: Song, Zhen-Hao
name: Liang, Jing
name: Liu, Kaihui
name: Liao, Zhi-Min
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: The electronic topology is generally related to the Berry curvature, which can induce the anomalous Hall effect in time-reversal symmetry breaking systems. Intrinsic monolayer transition metal dichalcogenides possesses two nonequivalent K and K' valleys, having Berry curvatures with opposite signs, and thus vanishing anomalous Hall effect in this system. Here we report the experimental realization of asymmetrical distribution of Berry curvature in a single valley in monolayer WSe2 through applying uniaxial strain to break C3v symmetry. As a result, although the Berry curvature itself is still opposite in K and K' valleys, the two valleys would contribute equally to nonzero Berry curvature dipole. Upon applying electric field, the emergent Berry curvature dipole would lead to an out-of-plane orbital magnetization, which further induces an anomalous Hall effect with a linear response to E^2, known as nonlinear Hall effect. We show the strain modulated transport properties of nonlinear Hall effect in monolayer WSe2 with moderate hole-doping by gating. The second-harmonic Hall signals show quadratic dependence on electric field, and the corresponding orbital magnetization per current density can reach as large as 60. In contrast to the conventional Rashba-Edelstein effect with in-plane spin polarization, such current-induced orbital magnetization is along the out-of-plane direction, thus promising for high-efficient electrical switching of perpendicular magnetization.
Improving cold-atom sensors with quantum entanglement: Prospects and challenges
Creators: name: Szigeti, Stuart S.
name: Hosten, Onur
name: Haine, Simon A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Quantum entanglement has been generated and verified in cold-atom experiments and used to make atom-interferometric measurements below the shot-noise limit. However, current state-of-the-art cold-atom devices exploit separable (i.e. unentangled) atomic states. This Perspective piece asks the question: can entanglement usefully improve cold-atom sensors, in the sense that it gives new sensing capabilities unachievable with current state-of-the-art devices? We briefly review the state-of-the-art in precision cold-atom sensing, focussing on clocks and inertial sensors, identifying the potential benefits entanglement could bring to these devices, and the challenges that need to be overcome to realize these benefits. We survey demonstrated methods of generating metrologically-useful entanglement in cold-atom systems, note their relative strengths and weaknesses, and assess their prospects for near-to-medium term quantum-enhanced cold-atom sensing.
description: Invited perspective; close to published version. Note the change in title. 19 pages, 7 figures
Sequential estimation of Spearman rank correlation using Hermite series estimators
Creators: name: Stephanou, Michael
name: Varughese, Melvin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: 62L12, 62G05

description: In this article we describe a new Hermite series based sequential estimator for the Spearman rank correlation coefficient and provide algorithms applicable in both the stationary and non-stationary settings. To treat the non-stationary setting, we introduce a novel, exponentially weighted estimator for the Spearman rank correlation, which allows the local nonparametric correlation of a bivariate data stream to be tracked. To the best of our knowledge this is the first algorithm to be proposed for estimating a time varying Spearman rank correlation that does not rely on a moving window approach. We explore the practical effectiveness of the Hermite series based estimators through real data and simulation studies demonstrating good practical performance. The simulation studies in particular reveal competitive performance compared to an existing algorithm. The potential applications of this work are manifold. The Hermite series based Spearman rank correlation estimator can be applied to fast and robust online calculation of correlation which may vary over time. Possible machine learning applications include, amongst others, fast feature selection and hierarchical clustering on massive data sets.
description: Revised article incorporating comments by the reviewers, associate editor and editor of the Journal of Multivariate Analysis (accepted manuscript). Changes include a modified title and a significantly shortened article
Beam normal spin asymmetry of elastic $eN$ scattering in the leading logarithm approximation
Creators: name: Borisyuk, Dmitry
name: Kobushkin, Alexander
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The beam normal spin asymmetry for the elastic $eN$ scattering is studied in the leading logarithm approximation. We derive the expression for the asymmetry, which is valid for any scattering angles. The result is compared with the results of other authors, obtained for the forward kinematics. We also calculate the numerical values of the asymmetry at intermediate energy and show that they are consistent with existing experimental data.
description: 10 pages, 3 figures. Some misprints and discussion are corrected
A NONPARAMETRIC ANALYSIS OF EFFICIENCY FOR A SAMPLE OF KANSAS BEEF COW FARMS
Creators: name: Featherstone, Allen M.
name: Langemeier, Michael R.
name: Ismet, Mohammad
name: Featherstone, Allen M.
name: Langemeier, Michael R.
name: Ismet, Mohammad
Publisher: name: Unknown
Year: 1997
Subjects: subject: Productivity Analysis
subject: Beef cow
subject: Industry structure
subject: Nonparametric efficiency

description: Competitive pressures in the cow-calf sector increased in 1995 because of a decline of 27% in calf prices. Technical, allocative, and scale efficiency measures were used to examine the competitiveness of a sample of Kansas beef cow farms. On average, the farms were 78% technically efficient, 81% allocatively efficient, and 95% scale efficient. Enterprise profitability was correlated positively with the efficiency measures. Inefficiency was related to herd size and degree of specialization. Producers should focus on using capital, feed, and labor more efficiently rather that increasing their size. Increased concentration of the cow-calf sector will not result in large cost savings given the current technology.
Nuclear de-excitations in low-energy charged-current $ν_e$ scattering on $^{40}$Ar
Creators: name: Gardiner, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Background: Large argon-based neutrino detectors, such as those planned for the Deep Underground Neutrino Experiment, have the potential to provide unique sensitivity to low-energy (few to tens of MeV) electron neutrinos produced by core-collapse supernovae. Despite their importance for neutrino energy reconstruction, nuclear de-excitations following charged-current $ν_e$ absorption on $^{40}$Ar have never been studied in detail at supernova energies. Purpose: I develop a model of nuclear de-excitations that occur following the $^{40}\mathrm{Ar}(ν_e,e^{-})^{40}\mathrm{K}^*$ reaction. This model is applied to the calculation of exclusive cross sections. Methods: A simple expression for the inclusive differential cross section is derived under the allowed approximation. Nuclear de-excitations are described using a combination of measured $γ$-ray decay schemes and the Hauser-Feshbach statistical model. All calculations are carried out using a novel Monte Carlo event generator called MARLEY (Model of Argon Reaction Low Energy Yields). Results: Various total and differential cross sections are presented. Two de-excitation modes, one involving only $γ$-rays and the other including single neutron emission, are found to be dominant at few tens-of-MeV energies. Conclusions: Nuclear de-excitations have a strong impact on the achievable energy resolution for supernova $ν_e$ detection in liquid argon. Tagging events involving neutron emission, though difficult, could substantially improve energy reconstruction. Given a suitable calculation of the inclusive cross section, the MARLEY nuclear de-excitation model may readily be applied to other scattering processes.
description: 26 pages, 9 figures. Consistent with published version
Light Qubit Storage and Retrieval using Macroscopic Atomic Ensembles
Creators: name: Sherson, J.
name: Soerensen, A. S.
name: Fiurasek, J.
name: Moelmer, K.
name: Polzik, E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an experimentally feasible protocol for the complete storage and retrieval of arbitrary light states in an atomic quantum memory using the well-established Faraday interaction between light and matter. Our protocol relies on multiple passages of a single light pulse through the atomic ensemble without the impractical requirement of kilometer long delay lines between the passages. Furthermore, we introduce a time dependent interaction strength which enables storage and retrieval of states with arbitrary pulse shapes. The fidelity approaches unity exponentially without squeezed or entangled initial states, as illustrated by explicit calculations for a photonic qubit.
description: 4 pages, 3 figures For his new version, the original paper has substantially rewritten to make it clearer including completely new introduction and conclusions and a rearrangement of the middle part. A minor mistake in the numerical results has been found and corrected, which resulted in higher values for the fidelities
Artificial coherent states of light by multi-photon interference in a single-photon stream
Creators: name: Steindl, P.
name: Snijders, H.
name: Westra, G.
name: Hissink, E.
name: Iakovlev, K.
name: Polla, S.
name: Frey, J. A.
name: Norman, J.
name: Gossard, A. C.
name: Bowers, J. E.
name: Bouwmeester, D.
name: Löffler, W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Coherent optical states consist of a quantum superposition of different photon number (Fock) states, but because they do not form an orthogonal basis, no photon number states can be obtained from it by linear optics. Here we demonstrate the reverse, by manipulating a random continuous single-photon stream using quantum interference in an optical Sagnac loop, we create engineered quantum states of light with tunable photon statistics, including approximate weak coherent states. We demonstrate this experimentally using a true single-photon stream produced by a semiconductor quantum dot in an optical microcavity, and show that we can obtain light with $g^{(2)}(0)\rightarrow1$ in agreement with our theory, which can only be explained by quantum interference of at least 3 photons. The produced artificial light states are, however, much more complex than coherent states, containing quantum entanglement of photons, making them a resource for multi-photon entanglement.
description: 6 pages + supplemental material
Extinction of an infectious disease: a large fluctuation in a non-equilibrium system
Creators: name: Kamenev, Alex
name: Meerson, Baruch
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We develop a theory of first passage processes in stochastic non-equilibrium systems of birth-death type using two closely related epidemiological models as examples. Our method employs the probability generating function technique in conjunction with the eikonal approximation. In this way the problem is reduced to finding the optimal path to extinction: a heteroclinic trajectory of an effective multi-dimensional classical Hamiltonian system. We compute this trajectory and mean extinction time of the disease numerically and uncover a non-monotone, spiral path to extinction of a disease. We also obtain analytical results close to a bifurcation point, where the problem is described by a Hamiltonian previously identified in one-species population models.
description: 4 pages
Integral constraints on the monodromy group of the hyperkahler resolution of a symmetric product of a K3 surface
Creators: name: Markman, Eyal
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Let M be a 2n-dimensional Kahler manifold deformation equivalent to the Hilbert scheme of length n subschemes of a K3 surface S. Let Mon be the group of automorphisms of the cohomology ring of M, which are induced by monodromy operators. The second integral cohomology of M is endowed with the Beauville-Bogomolov bilinear form. We prove that the restriction homomorphism from Mon to the isometry group O[H^2(M)] is injective, for infinitely many n, and its kernel has order at most 2, in the remaining cases. For all n, the image of Mon in O[H^2(M)] is the subgroup generated by reflections with respect to +2 and -2 classes. As a consequence, we get counter examples to a version of the weight 2 Torelli question, when n-1 is not a prime power.
description: Version 3: Latex, 54 pages. Expository changes
What factors affect the number of Emerald Ash Borer detections in Minnesota cities?
Creators: name: Hanna, Rob
name: Lippke-Calger, Ian
name: Whalen, Cara
name: Yamaguchi, Kazuyo
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 310399
subject: Ecology not elsewhere classified
classificationCode: 319999
subject: Other biological sciences not elsewhere classified

description: This project, "What factors affect the number of Emerald Ash Borer detections in Minnesota cities?" was completed in 2020 by students who participated in Earth Lab's HDR Earth Data Science Corps (EDSC) summer internship, which focuses on teaching technical data science skills to diverse student populations.
Fluctuations of local density of states and C0 speckle correlations are equal
Creators: name: van Tiggelen, B. A.
name: Skipetrov, S. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We establish a conceptual relation between the fluctuations of the local density of states (LDOS) and intensity correlations in speckle patterns resulting from multiple scattering of waves in random media. We show that among known types of speckle correlations (C1, C2, C3, and C0) only C0 contributes to LDOS fluctuations in the infinite medium. We propose to exploit the equivalence of LDOS fluctuations and C0 intensity correlation as a `selection rule' for scattering processes contributing to C0.
description: Revised paper, 5 pages, 1 figure, RevTeX
RELATIONSHIPS BETWEEN INDUSTRIALIZED AGRICULTURE AND ENVIRONMENTAL CONSEQUENCES: THE CASE OF VERTICAL COORDINATION IN BROILERS AND HOGS
Creators: name: Martin, Laura L.
name: Zering, Kelly D.
name: Martin, Laura L.
name: Zering, Kelly D.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Environmental Economics and Policy
subject: Livestock Production/Industries
subject: Industrialized agriculture
subject: Sustainability
subject: Vertical coordination

description: This paper examines the relationship between industrialized production in the pork and broiler industries and the natural environment. Historical perspectives are presented regarding the movement toward increasingly concentrated and coordinated pork and broiler production units in the South. The relationships between animal by-product management and environmental quality, both at the farm level and within a geographic region, are addressed. Using the North Carolina pork industry as a background, current regulations and potential policy implications to protect environmental quality are discussed.
Features and sustainability components of a laboratory of analysis for biogas plants
Creators: name: Vaccari, Vittorio
name: Manco, Immacolata
name: Cordoni, Cristina
name: Valvassori, Antonella
Publisher: name: Economia Aziendale Online
Year: 2015
Subjects: Biogas; raw material; business plan; laboratory

description: The purpose of this work is to examine the economic and environmental sustainability of a laboratory that carries out the necessary analyses for biogas production from biomass. The results emerging from the Business Plan were related to the state of facilities existing in the Lombardia region. The limits and potentiality of the sector were identified by means of the BEP Model (Break Even Point) in the geographic area of reference. The most interesting final results have revealed both the undeniable potential of the sector and its strategic role within the framework of the sustainable energy objectives of Europe 20-20-20. The network of laboratories, in fact, constitutes a guarantee and an element of security for the effective reduction of greenhouse gases.
description: Economia Aziendale Online, Vol 6, No 2 (2015): Issue 2/2015
Midgap States in Antiferromagnetic Heisenberg Chains with A Staggered Field
Creators: name: Lou, Jizhong
name: Chen, Changfeng
name: Zhao, Jize
name: Wang, Xiaoqun
name: Xiang, Tao
name: Su, Zhaobin
name: Yu, Lu
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study low-energy excitations in antiferromagnetic Heisenberg chains with a staggered field which splits the spectrum into a longitudinal and a transverse branch. Bound states are found to exist inside the field induced gap in both branches. They originate from the edge effects and are inherent to spin-chain materials. The sine-Gordon scaling $h_s^{2/3}|\log h_s|^{1/6}$ ($h_s$: the staggered field) provides an accurate description for the gap and midgap energies in the transverse branch for $S=1/2$ and the midgap energies in both branches for $S=3/2$ over a wide range of magnetic field; however, it can fit other low-energy excitations only at much lower field. Moreover, the integer-spin S=1 chain displays scaling behavior that does not fit this scaling law. These results reveal intriguing features of magnetic excitations in spin-chain materials that deserve further investigation.
description: 4 pages, 4figures
MARKETING STRATEGIES OF BIOTECHNOLOGY FIRMS: IMPLICATIONS FOR U.S. AGRICULTURE
Creators: name: Renkoski, Matthew A.
name: Renkoski, Matthew A.
Publisher: name: Unknown
Year: 1997
Subjects: subject: Research and Development/Tech Change/Emerging Technologies
subject: Biotechnology
subject: DuPont
subject: Marketing strategies

description: DuPont Quality Grains is focused on improving grain quality for end users, rather than on farm production traits. A major DuPont program is high oil corn. Feed corn has a huge market, and, because it requires no intermediate processing, any enhanced value is measurable by end users. Standard commodity markets do not function for capturing the value of enhance grains, and so DuPont works with end users, elevators, farmers, and seed companies to create market channels. As biotechnology commercializes more value-enhancing traits targeted to specific agricultural customers, vertical value chains will become shorter and more coordinated while standard commodity markets will diminish.
Analysis Plan: Quality assessment of a newly established laboratory for Optically Pumped Magnetometry (OPM)
Creators: name: Demko, Laszlo
name: Iglesias, Sandra
name: Heinzle, Jakob
name: Stephan, Klaas Enno
Publisher: name: Zenodo
Year: 2024

description: This analysis plan describes the analysis of a qualitiy assessment study for a newly established OPM-MEG system.
GFBio WP 3.1 - Data Portal & Search
Creators: name: König-Ries, Birgitta
name: Huber, Robert
name: Diepenbroek, Michael
name: Babalou, Samira
name: Becker, Florian
name: Behnken, Andree
name: Bingert, Sven
name: Fichtmüller, David
name: Frömming, Marcel
name: Kahn, Philipp
name: Karam, Naouel
name: Lachmann, René
name: Löffler, Felicitas
name: Müller-Birn, Claudia
name: Opasjumruskit, Kobkaew
name: Schindler, Uwe
name: Shafiei, Fateme
name: Thiel, Sven
name: Wesp, Valentin
Publisher: name: Zenodo
Year: 2021
Subjects: research data management
GFBio
semantic search
Data portal

description: Poster GFBio-07 from the GFBio General Assembly 2021 of "Work Package 3 - Data Access and Analyzes" of the GFBio Project summarizing the projects and subtasks work and outcome between 2013 and 2021. The Portal https://www.gfbio.org is the single point of entry for all steps in the Data Lifecycle: Dataset Search, Data Submission, Visualization, Data Management Planning, Training, Workbenches & Tools, Terminology Service. GFBio's search enables scholars to retrieve datasets from multiple archives and data repositories. The developed search interface -[Dai:Si] - allows an easy usage and presents search results in a user-friendly and comprehensive view.
ON THE TARGETING AND REDISTRIBUTIVE EFFICIENCIES OF ALTERNATIVE TRANSFER INTRUMENTS
Creators: name: Coady, David P.
name: Skoufias, Emmanuel
name: Coady, David P.
name: Skoufias, Emmanuel
Publisher: name: Unknown
Year: 2001
Subjects: Food Security and Poverty

description: We show how the so-called distributional characteristic of a policy instrument can be additively decomposed into two components: one that captures the targeting efficiency of the instrument, the other its redistributive efficiency. Using these measures, we provide an interpretation of the commonly used leakage and undercoverage rates (and other indices based on these concepts) within standard welfare theory. Essentially, one can interpret such indices as special (and restrictive) cases of the targeting efficiency index. As well as failing to capture the relative redistributive efficiencies of policy instruments, they also implicitly assume a set of value judgments consistent only with the commonly used poverty gap. For illustrative purposes, we present an empirical application of the decomposition approach to Mexican data.