cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dust Sensitivity of Absorption-Line Indices
Creators: name: MacArthur, Lauren A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the effects of dust extinction on integrated absorption-line indices that are widely used to derive constraints on the ages and metallicities of composite stellar systems. Typically, absorption-line studies have been performed on globular clusters or elliptical galaxies, which are mostly dust-free systems. However, many recent studies of integrated stellar populations have focused on spiral galaxies which may contain significant amounts of dust. It is almost universally assumed that the effects of dust extinction on absorption-line measurements are entirely negligible given the narrow baseline of the spectral features, but no rigorous study has yet been performed to verify this conjecture. In this analysis, we explore the sensitivity of the standard set of Lick absorption-line indices, the higher-order Balmer line indices, the 4000 A break, the near-IR calcium triplet indices, and the Rose indices to dust absorption according to population synthesis models that incorporate a multi-component model for the line and continuum attenuation due to dust. The latter takes into account the finite lifetime of stellar birth clouds. While dust does not greatly affect the line-index measurements for single stellar populations, its effect can be significant for the 4000 A break or when there is a significant amount of current star formation.
description: 19 pages, 15 embedded color figures, uses emulateapj.cls. Submitted to ApJ. High-resolution version available at http://www.physics.ubc.ca/~lauren/lickdust_HR.ps.gz
Searching for a $D \bar D$ bound state with the $ψ(3770) \to γD^0 \bar D^0$ decay
Creators: name: Dai, Lianrong
name: Toledo, Genaro
name: Oset, Eulogio
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a calculation of the mass distribution in the $ψ(3770) \to γD \bar D$ decay, studying both the $D^+ D^- $ and $D^0 \bar D^0 $ decays. The electromagnetic interaction is such that the tree level amplitude is null for the neutral channel, which leaves the $ψ(3770) \to γD^0 \bar D^0$ proceeding through a loop involving the $D^+ D^- \to D^0 \bar D^0$ scattering amplitude. We use the results for this amplitude of a theoretical model that predicts a $D \bar D$ bound state and find a $D^0 \bar D^0 $ mass distribution in the decay drastically different than phase space. The rates obtained are relatively large and the experiment is easily feasible in the present BESIII facility. The performance of this experiment could provide an answer to the issue of this much searched for state, which is the analogue of the $f_0(980)$ resonance.
description: 9 pages, 7 figures. add more discussions at the end of the results section related to BESIII
Trading efficiency in water quality markets
Creators: name: McDonald, Hugh J.
name: Kennedy, Marianna
name: Ngawhika, Simon
name: Kerr, Suzi
name: McDonald, Hugh J.
name: Kennedy, Marianna
name: Ngawhika, Simon
name: Kerr, Suzi
Publisher: name: Unknown
Year: 2010
Subjects: subject: Community/Rural/Urban Development
subject: Environmental Economics and Policy
subject: Health Economics and Policy
subject: International Relations/Trade
subject: Nutrient trading
subject: trading efficiency
subject: water quality markets
subject: transaction costs

description: A crucial factor in the success of any water quality trading market is its ability to cost-effectively reallocate nutrient allowances from initial holders to those users who find them most valuable; the market's trading efficiency. We explore causes of and solutions to trading inefficiency by assessing the impact on participant transaction costs and the tradeoffs that occur as a result of policy design decisions. Differing impacts of baseline-credit and cap-and-trade markets, the impact of trading rules and monitoring regimes are discussed in this endeavour. Possible solutions of increased information flows and regulatory certainty are also discussed. We then apply this framework to three existing water quality trading schemes; two from the US, and one from New Zealand. We use this experience to extract general recommendations for policy makers looking to maximise trading efficiency when designing future water quality trading markets.
Förderung des ökologischen Landbaus in Deutschland: Entwicklung und Zukunftsaussichten
Creators: name: Nieberg, Hiltrud
name: Strohm-Lompcke, Renate
name: Nieberg, Hiltrud
name: Strohm-Lompcke, Renate
Publisher: name: Unknown
Year: 2001
Subjects: subject: Agricultural and Food Policy
subject: Environmental Economics and Policy
subject: Farm Management
subject: organic farming
subject: agricultural policy
subject: support measures

description: Organic farming is promoted financially in the Federal Republic of Germany since 1989. The entire segment shows a very dynamic development since that time. In the past eleven years, the organically managed land area has increased more than ten-fold. Now, a large bouquet of measures are offered which target the promotion of organic farming. Among the supports are grants for organically managed land, investment incentives, the promotion of producer co-operatives, the promotion of on-farm processing and direct marketing, publicity measures and measures to raise consumer awareness as well as the support of training, extension and research in the field of organic farming. In addition, a series of pilot and demonstration projects in the area of processing and marketing of organic products have been carried out. Since large portions of the agricultural structure and the agri-environmental policy fall under the jurisdiction of the federal states (the “Bundesländer”), the concrete forms of the support measures as, for example the rates of payments for organically managed land, differ significantly from state to state. This is also reflected in the varying reaction of the states to the new orientation in agricultural policy taken by the federal government. It begins to emerge that the emphasis of support policy for organic farming will remain on the payment of area related premiums despite the new accents in national policy. This article identifies and discusses the current form of these support measures as well as possible approaches for further development. With regard to the total spectrum of measures promoting organic farming, a better co-ordination of the existing activities is recommended, for example within the internationally approved framework of an action plan for organic farming.
Preispolitik für ökologische Lebensmittel: Eine neo-institutionalistische Analyse
Creators: name: Spiller, Achim
name: Spiller, Achim
Publisher: name: Unknown
Year: 2001
Subjects: subject: Agribusiness
subject: Institutional and Behavioral Economics
subject: Marketing
subject: FOS: Economics and business
subject: organic food
subject: marketing
subject: price policy
subject: neoinstitutional organization theory

description: Price premiums are recognized as a central barrier for the diffusion of organic food. On average, the consumer has to pay about 50 % more for organic food than for comparable products. This is also true for large retailers although considerable economies of scale could be expected. Against this background the following article analyzes pricing strategies of supermarkets. It appears evident that higher prices of organic food reflect higher costs of production and lower output, but primarily this is due to inefficient structures in processing and marketing. Furthermore, the pressures of competition in the market are low; price reductions and bargain sales are avoided by competitors. If the premium prices are compared with the results of market research, a large discrepancy between the willingness to pay for organic food and actual prices will be found. By means of a conjoint analysis the managerial inefficiencies of this pricing policy can be proven. Finally, the paper gives theoretical justification for the current pricing policy of large retailers. We present a neo-institutional organizational approach to identify reasons for imitative behaviour. Similar pricing strategies of all retailers can be considered as a process of mimetic isomorphism. Particular emphasis is placed on high managerial uncertainty and pressure of stakeholders.
Unterschiede zwischen erfolgreichen und weniger erfolgreichen Ökobetrieben in Deutschland
Creators: name: Nieberg, Hiltrud
name: Nieberg, Hiltrud
Publisher: name: Unknown
Year: 2001
Subjects: subject: Farm Management
subject: organic farming
subject: conversion
subject: profitability
subject: economic performance

description: The conversion to organic farming has proven to be an economically interesting alternative for a large portion of the converted farms in the past. This contribution will consider the question of which factors influence the success of organic farming. The basis for the study is a series of data taken from the converting farms themselves as well as data of the farm accountancy data network. The success of conversion is measured by the profit difference in comparison to a conventional reference group, while the absolute performance of the organic farm is assessed classically on the basis of the profit per family work unit. The results show that the successful farms are more likely to be arable farms. Successful organic farms tend to produce in a more market-oriented manner. They get higher prices and produce a large number of products that can be sold for especially high prices on the organic market. As is to be expected, the successful farms also receive higher natural yields than the less successful farms and produce at a comparatively lower cost. Also, organic grants provide a lesser portion of their income, and they are thus less dependent on agricultural policies as less successful farms. A consideration of the most important socio-economic indices shows that successful farms are primarily those which are farmed full time. The farmers also have a comparatively above-average education in agriculture. A discussion of the most important consequences for politics and agricultural practice conclude this paper, drawn on the most important factors identified in the study.
Antimicrobial activity of harzianic acid against Staphylococcus pseudintermedius
Creators: name: Filippis, Anna De
name: Nocera, Francesca Paola
name: Tafuri, Simona
name: Ciani, Francesca
name: Staropoli, Alessia
name: Comite, Ernesto
name: Bottiglieri, Assunta
name: Gioia, Laura
name: Lorito, Matteo
name: Woo, Sheridan Lois
name: Vinale, Francesco
name: Martino, Luisa De
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: 60506 Virology

description: The emerging concern about the increase of antibiotic resistance has encouraged research efforts to develop effective alternatives to counteract bacterial infections. Herein, we studied a new perspective to therapeutic treatment against Staphylococcus pseudintermedius, an opportunistic pathogen documented as the major cause of skin, ear, and post-operative bacterial infections in dogs and cats. Antimicrobial activity of secondary metabolites produced by selected microbial strains belonging to Trichoderma, Talaromyces, Clonostachys and Coniothyrium fungal genera has been tested against S. pseudintermedius. Several extracts, particularly those obtained from Trichoderma harzianum E45 and ET45, showed a significant antimicrobial activity towards S. pseudintermedius methicillin-resistant (MRSP) and methicillin-susceptible (MSSP) strains. Bioassay-guided fractionation of E45 and ET45 extracts allowed to isolate harzianic acid as the major compound responsible for biological activities (e.g. antimicrobial, antibiofilm formation and biofilm disaggregation).
Energy-Momentum of a regular MMaS-class black hole
Creators: name: Patashnick, Owen
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the energy and momentum of a regular black hole of type defined by Mars, Martin-Prats, and Senovilla using the Einstein and Papapetrou definitions for energy-momentum density. Some other definitions of energy-momentum density are shown to give mutually contradictory and less reasonable results. Results support the Cooperstock hypothesis.
description: 16 pages, 3 figures, LaTex2e; made minor corrections (in content and in references) at the behest of two anonymous referees. Paper to appear in IJMPD
In vitro α-glycosidase and urease enzyme inhibition profile of some selected medicinal plants of Pakistan
Creators: name: Abdur Rauf
name: Saud Bawazeer
name: Naseer, Muhammad
name: Alhumaydhi, Fahad A.
name: Aljohani, Abdullah S. M.
name: Habib, Aamir
name: Raheem Khan
name: Urooj Jehan
name: Qureshi, Muhammad Nasimullah
name: Khan, Majid
name: Farooq, Umar
name: Amirzhan Kassenov
name: Shariati, Mohammad Ali
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Plant Biology
subject: 60506 Virology

description: The current study aims at exploring enzyme inhibition of four species of medicinal herbs, namely Senna bicapsularis, Thevetia peruviana, Nerium oleander and Vinca major. Plant selection was done on the basis of their therapeutic uses by local practitioners. The crude methanolic extracts of these plants were tested for their α-glycosidase and urease enzyme inhibition potential. The observed urease inhibitory potential for the crude extract of S. bicapsularis, T. peruviana and N. oleander were 8.3 ± 0.33 μg, 6.98 ± 0.98 μg and 9.56 ± 1.43 μg, respectively while the V. major did not show any inhibition. In addition, the IC50 value for Thiourea was 22.3 ± 1.14 μg. The crude extracts of S. bicapsularis, T. peruviana, N. oleander, V. major were shown to inhibit α-glycosidase activity with an IC50 value of 630.3 ± 0.03 μg, 700.7 ± 2.43 μg, 430.4 ± 3.97 μg, and the standard (acarbose) 880 ± 1.03 μM, respectively. Based on the TLC profile, the extract of S. bicapsularis was subjected to column chromatography and the major component named rhein (1) was identified. Compound 1 exhibited excellent urease and α-glycosidase inhibitory activity with an IC50 value of 7.4 ± 0.32 and 622.3 ± 1.03 μM, respectively.
Boundary effects on localized structures in spatially extended systems
Creators: name: Yadav, A.
name: Browne, D. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We present a general method of analyzing the influence of finite size and boundary effects on the dynamics of localized solutions of non-linear spatially extended systems. The dynamics of localized structures in infinite systems involve solvability conditions that require projection onto a Goldstone mode. Our method works by extending the solvability conditions to finite sized systems, by incorporating the finite sized modifications of the Goldstone mode and associated nonzero eigenvalue. We apply this method to the special case of non-equilibrium domain walls under the influence of Dirichlet boundary conditions in a parametrically forced complex Ginzburg Landau equation, where we examine exotic nonuniform domain wall motion due to the influence of boundary conditions.
description: 9 pages, 5 figures, submitted to Physical Review E
Introgressive hybridization between the endangered native Bombina pachypus and the introduced B. variegata in a protected area in central Italy
Creators: name: Talarico, Lorenzo
name: Ciambotta, Marco
name: Tiberi, Andrea
name: Mattoccia, Marco
Publisher: name: Brill Online
Year: 2020
Subjects: subject: 60399 Evolutionary Biology not elsewhere classified
subject: FOS: Biological sciences

description: Amphibians are experiencing an ascertained global decline, which causes include the introduction of alien species and the (anthropogenic) hybridization between native and exotic taxa. Detecting introductions and assessing their impact on populations of native species is crucial for amphibian conservation. We used mitochondrial and nuclear markers to reveal introgressive hybridization between the native Bombina pachypus and the exotic B. variegata (probably introduced from Albania) in a population from a protected area of central Italy. Almost all genotyped individuals were genetically admixed, showing a larger proportion of the allochthonous genome. To our knowledge, this study provides the first evidence of successful hybridization between the two species (we found both putative F1 and backcrosses), hence representing a new threat to the conservation of the endangered, Italian-endemic B. pachypus.
Nonsingular positon and complexiton solutions for the coupled KdV system
Creators: name: Hu, H. C.
name: Tong, Bin
name: Lou, S. Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Taking the coupled KdV system as a simple example, analytical and nonsingular complexiton solutions are firstly discovered in this letter for integrable systems. Additionally, the analytical and nonsingular positon-negaton interaction solutions are also firstly found for S-integrable model. The new analytical positon, negaton and complexiton solutions of the coupled KdV system are given out both analytically and graphically by means of the iterative Darboux transformations.
description: 16 pages, 8 figures
The radio counter-jet of the QSO 3C~48
Creators: name: Feng, W. X.
name: An, T.
name: Hong, X. Y.
name: Zhao, Jun-Hui
name: Venturi, T.
name: Shen, Z. -Q.
name: Wang, W. H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present multi--frequency radio observational results of the quasar 3C~48. The observations were carried out with the Very Large Array (VLA) at five frequencies of 0.33, 1.5, 4.8, 8.4, and 22.5 GHz, and with the Multi--Element Radio Linked Interferometer Network (MERLIN) at the two frequencies of 1.6 and 5 GHz. The source shows a one--sided jet to the north within 1\arcsec, which then extends to the northeast and becomes diffuse. Two bright components (N2 and N3), containing most of the flux density are present in the northern jet. The spectral index of the two components is $α_{N2}\sim-0.99\pm0.12$ and $α_{N3}\sim-0.84\pm0.23$ ($S\proptoν^α$). Our images show the presence of an extended structure surrounding component N2, suggestive of strong interaction between the jet and the interstellar medium (ISM) of the host galaxy. A steep--spectrum component, labelled as S, located 0.25 ardsec southwest to the flat--spectrum component which could be the core of 3C 48, is detected at a significance of $>15σ$. Both the location and the steepness of the spectrum of component S suggest the presence of a counter--jet in 3C 48.
description: 7 pages, 6 figures, accepted by A&A
Strong localization in a suspended monolayer graphene by intervalley scattering
Creators: name: Yanik, Cenk
name: Sazgari, Vahid
name: Canatar, Abdulkadir
name: Vaheb, Yaser
name: Kaya, Ismet I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A gate induced insulating behavior at zero magnetic field is observed in a high mobility suspended monolayer graphene near the charge neutrality point. The graphene device initially cleaned by a current annealing technique was undergone a thermo-pressure cycle to allow short range impurities to be adsorbed directly on the ultra clean graphene surface. The adsorption process generated a strong temperature and electric field dependent behavior on the conductance of the graphene device. The conductance around the neutrality point is observed to be reduced from around $e^2/h$ at 30 K to $\sim0.01~e^2/h$ at 20 mK. A direct transition from insulator to quantum Hall conductor within $\approx0.4~T$ accompanied by broken-symmetry-induced $ν=0,\pm1$ plateaux confirms the presence of intervalley scatterers.
description: 4 pages, 4 figures
Lower-Order Terms of the 1-Level Density of Families of Elliptic Curves
Creators: name: Young, Matthew
Publisher: name: arXiv
Year: 2004
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: The Katz-Sarnak philosophy predicts that statistics of zeros of families of L-functions are strikingly universal. However, subtle arithmetical differences between families of the same symmetry type can be detected by calculating lower-order terms of the statistics of interest. In this paper we calculate lower-order terms of the 1-level density of some families of elliptic curves. We show that there are essentially two different effects on the distribution of low-lying zeros. First, low-lying zeros are more numerous in families of elliptic curves E with relatively large numbers of points (mod p). Second, and somewhat surprisingly, a family with a relatively large number of primes of bad reduction has relatively fewer low-lying zeros. We also show that the lower order term can grow arbitrarily large by taking a biased family with a relatively large number of points (mod p) for all small primes p.
description: 35 pages; minor changes, mostly in exposition; to be published in IMRN
Reale Optionen und Landwirtschaftliche Betriebslehre – oder: Kann man mit der Optionspreistheorie arbitrieren?
Creators: name: Odening, Martin
name: Musshoff, Oliver
name: Odening, Martin
name: Musshoff, Oliver
Publisher: name: Unknown
Year: 2001
Subjects: subject: Farm Management
subject: Risk and Uncertainty
subject: real options
subject: investment under uncertainty
subject: flexibility
subject: contingent claim analysis
subject: hysteresis
subject: hog finishing

description: This paper discusses the real options approach to investment. Real options facilitate an analysis of investment under uncertainty explicitly taking into account irreversibility of the investment decision and flexibility with respect to the investment timing. This is achieved by exploiting the analogy between a financial option and an investment project. We pinpoint the relation to traditional methods of capital budgeting as well as the special features of this concept, namely the exclusion of arbitrage opportunities and the independence of individual risk preferences. Analytical and numerical solution procedures for option pricing are presented. An application to investments in hog finishing illustrates the main ideas of the real options approach. It turns out that compared to traditional investment criteria, e.g. the net present value, the optimal investment trigger is considerably higher. Hence real options give an explanation for economic hysteresis. The reason for the increase of the investment trigger is that the opportunity to delay the investment decision, i.e. the value of waiting, causes opportunity costs that have to be covered by the expected investment returns. Finally model extensions, which consider different stochastic processes, compound real options, and competition, are discussed.
Update on technical aspects of B meson mixing at NNLO
Creators: name: Reeck, Pascal
Publisher: name: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Year: 2024

description: This report summarises important technical challenges and their solutions in the calculation of the next-to-next-to-leading order QCD corrections to the width difference ΔΓs in the Bs - (Equation presented)s system. We focus on the treatment of spinor structures with products of up to 22 γ matrices by means of projection and tensor integrals. Moreover, we present an approach for the semi-numeric computation of master integrals.
Zeitpräferenz und Zeitkonsistenz: Zur Rationalität sequenzieller Entscheidungen
Creators: name: Weikard, Hans-Peter
name: Weikard, Hans-Peter
Publisher: name: Unknown
Year: 2001
Subjects: subject: Institutional and Behavioral Economics
subject: decision theory
subject: discounting
subject: time preference
subject: time consistency

description: The paper discusses the problem of discounting, time preference, and time consistent decision making. While a constant pure rate of time preference leads to consistent consumption plans, other discounting schemes – like hyperbolic discounting – do not. Using a so-called money pump argument, time inconsistencies can be shown to be irrational. The paper also explores the use of a hedonic utility concept to explain sequential choice behaviour.
Agrarpolitik und der Pfad der Tugend
Creators: name: Grosskopf, Werner
name: Grosskopf, Werner
Publisher: name: Unknown
Year: 2001
Subjects: subject: Agricultural and Food Policy
subject: Optimization of a policy mix
subject: reform of the CAP
subject: TINBERGEN principle

description: In the next five years the efforts of reforming the common agricultural policy need to be reinforced. One reason is the requirement to intensify the international trade with agricultural products, particularly for development policy reasons. Furthermore, a restructuring of the EU-finances concerning the regional and structural development within the framework of the EU-enlargement and a more intensive management of the natural capital is forthcoming. Starting from the three-dimensional target of sustainability the basic principles of the political alignment are discussed and in particular applied on compliance with the TINBERGEN Principle. The arguments against an accelerated liberalization of agricultural production in the EU are evaluated. Concerning the extent of liberalization it is shown, that there must be distinguished between industrialized and developing countries. Moreover, the study points out the importance of the principle of subsidiarity, due to the fact that overcoming the path-dependency can only be achieved by pursuing this principle.
Variational analysis of self-focusing of intense ultrashort pulses in gases
Creators: name: Arevalo, E.
name: Becker, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Optics (physics.optics)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: By using perturbation theory we derive an expression for the electrical field of a Gaussian laser pulse propagating in a gas medium. This expression is used as a trial solution in a variational method to get quasianalytical solutions for the width, intensity and self-focusing distance of ultrashort pulse. The approximation gives an improved agreement with results of numerical simulations for a broad range of values of the input power of the pulse than previous analytical results available in the literature.
description: 19 pages, 8 figures
Performance of visual vs. software-assisted photo-identification in mark-recapture studies: a case study examining different life stages of the Pacific Horned Frog (Ceratophrys stolzmanni)
Creators: name: Bardier, Cecilia
name: Székely, Diana
name: Augusto-Alves, Guilherme
name: Matínez-Latorraca, Nicolás
name: Schmidt, Benedikt R.
name: Cruickshank, Sam S.
Publisher: name: Brill Online
Year: 2020
Subjects: subject: 60399 Evolutionary Biology not elsewhere classified
subject: FOS: Biological sciences

description: The use of individual phenotypic features as non-invasive marks through photo identification (photo-ID) has many advantages for individual-based field studies. However, since error rates vary between species, matching techniques, and image qualities, it is important to assess error rates to evaluate the reliability of photo-ID. We tested the performance of this method in the Pacific Horned Frog, Ceratophrys stolzmanni, a threatened anuran with a variable dorsal coloration. We compared the effectiveness of visual (i.e. human recognition) versus software-assisted recognition techniques (Wild-ID and APHIS), and assessed the potential applicability of these techniques to identify post-metamorphic individuals (froglets). The three techniques differed in their performance. The visual technique was the only one to produce type I errors between pairs of images (i.e. matching images which are not true matching pairs), however it also produced fewer type II errors (i.e. not identifying true matching pairs of images) than the software-assisted techniques. For froglets, we found that similarity scores calculated by photo-ID software did not differ significantly between groups of froglets and older individuals, supporting that colour patterns in this species remain stable after metamorphosis. The lack of type I errors and the substantial reduction in required time achieved through the use of software, make software-assisted techniques (particularly Wild-ID) a valid and convenient matching technique for C. stolzmanni. We propose that photo-ID can also be applied to froglets of this species, since the pattern at this stage appears to be as variable as in adults and maintained through life.
Higgs inflation with the Holst and the Nieh-Yan term
Creators: name: Långvik, Miklos
name: Ojanperä, Juha-Matti
name: Raatikainen, Sami
name: Rasanen, Syksy
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The action of loop quantum gravity includes the Holst term and/or the Nieh-Yan term in addition to the Ricci scalar. These terms are expected to couple non-minimally to the Higgs. Thus the Holst and Nieh-Yan terms contribute to the classical equations of motion, and they can have a significant impact on inflation. We derive inflationary predictions in the parameter space of the non-minimal couplings, including non-minimally coupled terms up to dimension 4. Successful inflation is possible even with zero or negative coupling of the Ricci scalar. Notably, inflation supported by the non-minimally coupled Holst term alone gives almost the same observables as the original metric formulation plateau Higgs inflation. A non-minimally coupled Nieh-Yan term alone cannot give successful inflation. When all three terms are considered, the predictions for the spectral index and tensor-to-scalar ratio span almost the whole range probed by upcoming experiments. This is not true for the running of the spectral index, and many cases are highly tuned.
description: 16+9 pages, 1 figure. Corrected typos and one figure, added references and explanations. Published version
Unification, Multiplets and Proton Decay
Creators: name: Roy, Tuhin
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We make a detailed analysis of gauge coupling unification in supersymmetry. When the Standard Model gauge group is embedded in a Grand Unified Theory, new particles often appear below the GUT scale in order to predict the right phenomenology at low energy. While these new particles are beyond the reach of accelerator experiments, they change the prediction of α_s. Here we classify all the (SU(3)_C,SU(2)_L,U(1)_Y) representations which improve or worsen the prediction. Running experimentally determined values of the coupling constants at two loops we calculate the allowed range of masses of fields in these representations. We explore the implication of these results in SU(5) and SU(3)^3 (trinification) models. We discover that minimal trinification predicts light triplet Higgs particles which lead to proton decay with a lifetime in the vicinity of the current experimental bound.
description: figures replaced, new calculations and references added. A quantitative description of dependence of unification on varying input parameters as well as varying the sparticle spectrum is added. This version to appear in PRD
Neuromorphic Eye-in-Hand Visual Servoing
Creators: name: Muthusamy, Rajkumar
name: Ayyad, Abdulla
name: Halwani, Mohamad
name: Zweiri, Yahya
name: Gan, Dongming
name: Seneviratne, Lakmal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: I.2; I.2.9; I.2.8

description: Robotic vision plays a major role in factory automation to service robot applications. However, the traditional use of frame-based camera sets a limitation on continuous visual feedback due to their low sampling rate and redundant data in real-time image processing, especially in the case of high-speed tasks. Event cameras give human-like vision capabilities such as observing the dynamic changes asynchronously at a high temporal resolution ($1μs$) with low latency and wide dynamic range. In this paper, we present a visual servoing method using an event camera and a switching control strategy to explore, reach and grasp to achieve a manipulation task. We devise three surface layers of active events to directly process stream of events from relative motion. A purely event based approach is adopted to extract corner features, localize them robustly using heat maps and generate virtual features for tracking and alignment. Based on the visual feedback, the motion of the robot is controlled to make the temporal upcoming event features converge to the desired event in spatio-temporal space. The controller switches its strategy based on the sequence of operation to establish a stable grasp. The event based visual servoing (EVBS) method is validated experimentally using a commercial robot manipulator in an eye-in-hand configuration. Experiments prove the effectiveness of the EBVS method to track and grasp objects of different shapes without the need for re-tuning.
description: 8 pages, 10 figures
Automatic Computation of Conservation Laws in the Calculus of Variations and Optimal Control
Creators: name: Gouveia, Paulo D. F.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 49K15, 49-04, 49S05

description: We present analytic computational tools that permit us to identify, in an automatic way, conservation laws in optimal control. The central result we use is the famous Noether's theorem, a classical theory developed by Emmy Noether in 1918, in the context of the calculus of variations and mathematical physics, and which was extended recently to the more general context of optimal control. We show how a Computer Algebra System can be very helpful in finding the symmetries and corresponding conservation laws in optimal control theory, thus making useful in practice the theoretical results recently obtained in the literature. A Maple implementation is provided and several illustrative examples given.
description: Partially presented at the 10th International Conference "Mathematical Modelling and Analysis", and "2nd International Conference "Computational Methods in Applied Mathematics", June 1 - 5, 2005, Trakai, Lithuania. A Maple worksheet is available at http://www.mat.ua.pt/delfim/maple.htm
Agentenbasierte Politik- und Sektoranalyse - Perspektiven und Herausforderungen
Creators: name: Balmann, Alfons
name: Happe, Kathrin
name: Balmann, Alfons
name: Happe, Kathrin
Publisher: name: Unknown
Year: 2001
Subjects: subject: Agricultural and Food Policy
subject: Agent-based modeling
subject: agent-based systems
subject: policy analysis
subject: sector modeling

description: During the last decade a new modeling approach, known as agent-based modeling, was developed and made its way into several areas of research. It greatly benefited from rapid developments in computing technology. As for economics, agent-based modeling is based on the observation that social systems can be understood and modeled explicitly as systems of interacting agents. Because of their flexibility with respect to the representation of agents, the interactions between agents as well as the resulting dynamic and spatial relationships, these models offer a great variety of perspectives for future research. In this contribution, the underlying modeling concept is presented, and exemplary applications to the field of sector and policy analysis are discussed. Future perspectives of agent-based modeling are pointed out, but also challenges to the agent-based approach are presented.
title: Girl Trouble – Teddy Girls im London der 1950er-Jahre
Creators: name: Nunkesser, Nicole
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: 1950er-Jahre
subject: Doing Gender
subject: Geschlecht
subject: Körper
subject: Mode
subject: Selbstinszenierung
subject: Teddy Girls
subject: Urbaner Raum
subject: ddc:940

description: In diesem Beitrag geht es um die Frage jugendlicher Vereinnahmung und Besetzung des urbanen Raums durch eine Gruppe junger Frauen aus dem britischen Arbeiter*innenmilieu der 1950er-Jahre, die als Teddy Girls bezeichnet wurden. Erörtert wird, welche (Frei-)Räume und Möglichkeiten der Partizipation am öffentlichen Leben sichjunge Frauen der Jahrgänge 1936 bis 1940 entgegen den gängigen weiblichen Leitbildern der Zeit schaffen, besetzen und verlieren. Teddy Girls irritieren und dekonstruieren u. a. durch ihren spezifischen Kleidungsstil den binär strukturierten Geschlechtercode, widersetzen sich den gesellschaftlichen Zumutungen und Erwartungen an Geschlechterbilder und Rollen, modellieren diese nach ihren jugendkulturellen Bedürfnissen. Der urbane Raum wird als Laboratorium jugendlicher Genderkonstruktionen genutzt und dient alternativen Wegen der Herstellung von Geschlechtlichkeit. Andersherum werden Räume geschaffen oder umgedeutet, die Distinktion und Zugehörigkeit verkörpern.
On gravitational lensing by quadrupole potentials
Creators: name: Palle, Davor
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study gravitational lensing by quadrupole potentials within the linearized gravity approximation and the integration over the unperturbed photon trajectory. It is well known that the quadrupole potential contribution to the deviation angle is much smaller than that of the monopole one. We show, however, that quadrupole potentials can change the photon polarization vector, but there is no contribution from the monopole term to the first order. The effect is maximal when the axis of the quadrupole is tangential to the photon trajectory and it is proportional to the frequency(rate) of the quadrupole moment of the deflector. The second order correction of the monopole potential to the polarization is canceled away by the renormalization of the polarization vector.
description: 8 pages, minor textual changes, two references added
Net Effect of Education on Technology Adoption by U.S. Farmers
Creators: name: Uematsu, Hiroki
name: Mishra, Ashok K.
name: Uematsu, Hiroki
name: Mishra, Ashok K.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Crop Production/Industries
subject: Farm Management
subject: Production Economics
subject: Risk and Uncertainty
subject: Education
subject: Technology adoption
subject: Off-farm labor supply
subject: Precision farming
subject: Genetically modified crops
subject: Simultaneous equations model

description: The objective of this study is to estimate the net effect of education on technology adoption for U.S. farmers. Using 2006 Agricultural Resource Management Survey data, this study develops a simultaneous equations model to integrate farmers’ labor allocation decision with adoption of both time saving and management intensive technologies.
title: Jenseits von Atwood: gruselige Echos oder die 'Magd‘ als ikonische Figuration (geschlechter-)politischen Widerstands
Creators: name: Mieszkowski, Sylvia
Publisher: name: Humboldt-Universität zu Berlin
Year: 2020
Subjects: subject: Film
subject: Parrhesia
subject: Reproduktion
subject: Reproduktive Rechte
subject: Serielle Figur
subject: The Handmaid’s Tale
subject: USA
subject: Widerstand
subject: ddc:800

description: Dieser Beitrag tritt an, Parallelen aufzuzeigen zwischen zeitgenössischer Biopolitik am rechten Rand des US-amerikanischen Spektrums und der ersten Staffel der TV-Adaption (2017) von Margaret Atwoods dystopischem Roman The Handmaid’s Tale (1985). Es gilt, eine doppelte These zu belegen, deren Teile durch die Frage verbunden sind, wie eine ursprünglich literarische Figur, eine kulturelle Repräsentation, durch Verflachung, Serialisierung, Ikonisierung zur Figuration politischen Widerstands in der Realität werden kann. Zum einen schlage ich vor, die transmediale ‚Magd‘, die sich zum internationalen Phänomen des Protests gegen sexistische Gesetzgebung entwickelt hat, als „serielle Figur“ im Sinne Ruth Mayers zu verstehen. Zum anderen zeige ich, wie die Heldin der Hulu- Serie ihren aufgegebenen Subjektstatus in einem – mit Michel Foucault als parrhesia zu bezeichnenden – Akt „risikobehafteten Wahrsprechens“ zurückerkämpft. Insgesamt geht es darum zu zeigen, wie verschiedene kulturelle Iterationen der ‚Magd‘ zu einem sozio-politischen Diskurs beitragen, der gegen misogyne Geschlechterpolitik und ihre Gouvernementalität Stellung bezieht.
Factors Influencing Private Landowner Restoration Investment Decisions in Coastal Louisiana
Creators: name: Dedah, Cheikhna O.
name: Kazmierczak, Richard F.
name: Keithly, Walter R.
name: Dedah, Cheikhna O.
name: Kazmierczak, Richard F.
name: Keithly, Walter R.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Environmental Economics and Policy
subject: Land Economics/Use
subject: Risk and Uncertainty
subject: wetlands
subject: restoration
subject: investment
subject: risk
subject: attitudes

description: Coastal wetland loss has been a major problem in Louisiana, exceeding 1.2 million acres over the last century alone. Although federal, state, and local efforts have attempted to combat this loss from a public perspective, little has been done to encourage private landowners to maintain and protect their coastal lands. This paper investigates the factors that influence private landowners to invest in coastal wetland restoration and maintenance activities in Louisiana. We surveyed private coastal landowners to determine their general socioeconomic characteristics, attitudes toward risks, attitudes toward wetland conservation, current uses of landholdings, and previous investments in wetland restoration and maintenance projects. Using this survey data, an econometric model was estimated to determine how various factors could influence the probability and the level of investment in coastal restoration. Preliminary results show that property size, attitudes toward wetland restoration and maintenance, land use, and degree of risk aversion are important factors in a landowner’s decisions to invest in wetland restoration and maintenance.
Broadband photometry of asteroid 6478 Gault: activity and morphology
Creators: name: Borysenko, S.
name: Baransky, A.
name: Simon, A.
name: Vasylenko, V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the results of short observational program for asteroid 6478 Gault with using of V and R Johnson filters realized at the Kyiv Comet Station during January-April 2019. Color indices and distribution of brightness in the comet-like tail were calculated. We made a comparative analysis of circumstances of the asteroid 6478 Gault activity with others morphologically similar active Main Belt asteroids.
Potential for Tradable Water Allocation and Rights in Jordan
Creators: name: Carpio, Carlos E.
name: Ramirez, Octavio A.
name: Boonsaeng, Tullaya
name: Carpio, Carlos E.
name: Ramirez, Octavio A.
name: Boonsaeng, Tullaya
Publisher: name: Unknown
Year: 2010
Subjects: subject: Research Methods/ Statistical Methods
subject: Resource /Energy Economics and Policy
subject: Contingent valuation
subject: non-parametric estimation
subject: water supply curve

description: This paper estimates the costs of buying water use rights from farmers located in the Mafraq-Azraq basin in Jordan. Farmers’ water supply curve is estimated using data gathered from a contingent valuation survey. Estimation results indicate that a total supply of 29 million m3 could be periodically purchased from farmers at an annual price of approximately JD 0.23/m3 (1 JD ≈ 0.70 U.S. dollars), or a total cost of about JD 6.8 million per year.
Teacher leadership in an early literacy initiative : roles and perspectives
Creators: name: Jara, Debra Yoko
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to examine teacher leadership in literacy from the perspective of the literacy leaders in the Hampton School District Early Literacy Initiative (ELI). The Hampton School District ELI is a grassroots movement aimed at improving literacy instruction in the district. The literacy leaders in this study are classroom teachers who serve as literacy mentors in the district, or school coordinators within their respective schools. Two literacy mentors and thirty-seven school coordinators responded to a questionnaire and six of these literacy leaders participated in one-on-one interviews. The results revealed that they had perceptions of leadership that ranged from a more traditional, managerial view of leadership to a transformational, constructivist view of leadership. However, while not all the literacy leaders in the study considered themselves to hold a leadership position, most leaders perceived their role within the ELI to be a transformational, constructivist one. Most participants did not take on the role for the leadership experience. The study found that the participants believed an interest in literacy and good organizational, interpersonal and communication skills were characteristics that helped them function effectively in their role. Literacy mentors also stated that being a classroom teacher was helpful. Challenges the participants identified included lack or resources, such as time, and money for release time and the need for more professional development. Participants experienced benefits such as increased opportunities for learning and collaboration with their colleagues. The study also concludes that literacy leaders experience fewer challenges as they work toward school improvement and the change process when teachers set the goals and work together in their implementation.