cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
MANAGING THE RISK OF EUROPEAN CORN BORER RESISTANCE TO TRANSGENIC CORN: AN ASSESSMENT OF CONTROVERSIAL REFUGE RECOMMENDATIONS
Creators: name: Hurley, Terrance M.
name: Secchi, Silvia
name: Hellmich, Richard L.
name: Hurley, Terrance M.
name: Secchi, Silvia
name: Hellmich, Richard L.
Publisher: name: Unknown
Year: 1999
Subjects: Productivity Analysis
Research and Development/Tech Change/Emerging Technologies
Risk and Uncertainty

description: A bioeconomic model is developed to evaluate the tradeoff between the risk of resistance and increased productivity when refuge is planted in conjunction with transgenic pesticidal corn. The model is used to evaluate controversial refuge recommendations when producers are allowed to treat refuge in years of high pest pressure.
A Decade of Disparities Examining National Educational Outcomes for Male Racial Subgroups
Creators: name: Ponjuán, Luis
name: Lester, Marquis Alexander
name: Hernández, Susana H
Publisher: name: Project MALES Research Institute
Year: 2021
Subjects: Men of Color, Racial Disparities, Disaggregated Educational Data

description: The COVID-19 pandemic has created unprecedented challenges to the American educational system. Unfortunately, marginalized communities, especially male students of color, have been adversely affected by this pandemic. This report provides current national level educational data, disaggregated by race and gender, that provides critical insights about the plight of male students of color over a decade from 2010 to 2020. This research digest highlights the disparities in educational outcomes over a decade for male students of color. We identified several key findings to illustrate how male students of color overcome barriers throughout their educational pathways. This research digest highlights the power of disaggregated educational data because it provides a nuanced look at educational attainment rates for male racial subgroups. We also assert that exploring this issue should not be explained using a deficit-based narrative that suggests these disparities of educational outcomes are solely based on individualbased characteristics (e.g. lack of motivation). This research digest concludes with our recommendations for ten action steps over the next decade that compels school districts, community colleges, bachelor’s degree granting institutions, communities, and educational policy leaders to address this national challenge during the pandemic and beyond.
Interface effects in spin-dependent tunneling
Creators: name: Tsymbal, E. Y.
name: Belashchenko, K. D.
name: Velev, J. P.
name: Jaswal, S. S.
name: van Schilfgaarde, M.
name: Oleynik, I. I.
name: Stewart, D. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the past few years the phenomenon of spin dependent tunneling (SDT) in magnetic tunnel junctions (MTJs) has aroused enormous interest and has developed into a vigorous field of research. The large tunneling magnetoresistance (TMR) observed in MTJs garnered much attention due to possible application in random access memories and magnetic field sensors. This led to a number of fundamental questions regarding the phenomenon of SDT. One such question is the role of interfaces in MTJs and their effect on the spin polarization of the tunneling current and TMR. In this paper we consider different models which suggest that the spin polarization is primarily determined by the electronic and atomic structure of the ferromagnet/insulator interfaces rather than by their bulk properties. First, we consider a simple tight-binding model which demonstrates that the existence of interface states and their contribution to the tunneling current depend on the degree of hybridization between the orbitals on metal and insulator atoms. The decisive role of the interfaces is further supported by studies of spin-dependent tunneling within realistic first-principles models of Co/vacuum/Al, Co/Al2O3/Co, Fe/MgO/Fe, and Co/SrTiO3/Co MTJs. We find that variations in the atomic potentials and bonding strength near the interfaces have a profound effect resulting in the formation of interface resonant states, which dramatically affect the spin polarization and TMR. The strong sensitivity of the tunneling spin polarization and TMR to the interface atomic and electronic structure dramatically expands the possibilities for engineering optimal MTJ properties for device applications.
description: 22 pages
Ellipticity of dark matter halos with galaxy-galaxy weak lensing
Creators: name: Mandelbaum, Rachel
name: Hirata, Christopher M.
name: Broderick, Tamara
name: Seljak, Uros
name: Brinkmann, Jonathan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of attempts to detect the ellipticity of dark matter halos using galaxy-galaxy weak lensing with SDSS data. We use 2,020,256 galaxies brighter than r=19 with photometric redshifts (divided into colour and luminosity subsamples) as lenses and 31,697,869 source galaxies. We search for and identify several signal contaminants, which if not removed lead to a spurious detection. These include systematic shear that leads to a slight spurious alignment of lens and source ellipticities, intrinsic alignments (due to contamination of the source sample by physically-associated lens source pairs), and anisotropic magnification bias. We develop methods that allow us to remove these contaminants to the signal. We split the analysis into blue (spiral) and red (elliptical) galaxies. Assuming Gaussian errors as in previous work and a power-law profile, we find f_h=e_h/e_g=0.1+/-0.06 for red galaxies and -0.8+/-0.4 for blue galaxies using 20-300 kpc/h, averaged over luminosity. Inclusion of the more realistic non-Gaussian error distributions and of the NFW density profile (which predicts much smaller ellipticity of the shear for scales above the scale radius) yields 0.60+/-0.38 for ellipticals and -1.4+1.7-2.0 for spirals. While there is no concrete detection of alignment in either case, there is a suggestion in the data of a positive alignment in the brightest lens sample of ellipticals. Our results appear to be mildly inconsistent with a previously reported detection by Hoekstra et al. (2004), but more data and further tests are needed to clarify whether the discrepancy is real or a consequence of differences in the lens galaxy samples used and analysis methods.
description: 20 pages, 8 figures, matches MNRAS accepted version (includes updated discussion of systematics, no changes to conclusions)
OVER-ORDER PREMIUMS AND PRICE WARS IN THE MICHIGAN MILK MARKET
Creators: name: Banderob, Duane A.
name: Wolf, Christopher A.
name: Banderob, Duane A.
name: Wolf, Christopher A.
Publisher: name: Unknown
Year: 1999
Subjects: Demand and Price Analysis

description: We examine behavior in the Michigan fluid milk market. Over-order premiums exist because fluid milk demands are inelastic. Collusion by cooperatives is required to realize these profits. In absence of collusion, the minimum prices defined by federal milk marketing orders prevails as excess fluid milk is always present. Proprietary firms in Michigan joined the fluid milk cartel because of the threat of a state marketing order. Proprietary firms profits may be increased and information gathered in the short run through price wars that result when behavior deviates from collusion.
title: Examining group purpose and self-motivation as antecedents to cohesiveness in groups: An action research inquiry exploring a notion of “Teamship”
Creators: name: Lees, Kieran
Publisher: name: University of Reading
Year: 2021

description: The primary purpose of this study was to examine group purpose and self-motivation as 
antecedents to cohesiveness in groups, and to explore a notion of “teamship”. The study 
employed a longitudinal action research design in an international rugby squad over an eight month period and spanning two competitive tournaments, including the Rugby World Cup 
Repechage in 2018, and the Rugby Europe International Championship in 2019. The researcher 
held both academic and practitioner roles for the duration of the engagement.
Multiple data sources were used: in-depth interviews; observation; documents; social media 
channels; photographic records; video recordings and researcher reflections which were analysed 
from first-, second-, and third-person perspectives, providing a comprehensive longitudinal 
perspective on the temporal development of group processes and self-motivational needs and 
fulfilment.
The research contributes to knowledge in the areas of group cohesiveness, group purpose, group 
stage development, group processes and group-member motivation and behaviour. 
The main contributions of the study are: 1) reconceptualisation of group purpose as a multi-level 
construct; 2) reconceptualisation of group cohesiveness as a multi-dimensional fluid emergent
state in groups, with bonds of cohesion that evolve and change; 3) a novel typology of groups and 
group stage development based on group purpose, task interdependence, group cohesiveness, 
group identity and self-motivational needs; 4) the addition of “affective interdependence” to the 
extant literature on group interdependence; 5) the determination that a “team” is an emergent 
group state based on selfless behaviours, group identity and group self-regulation; and 6) the 
conceptualisation and definition of “teamship” in both theory and practice.
The structure of the thesis and use of abductive second-person analysis to create third person 
retroductive insights contributes to action research method.
Future research should seek to explore further the findings from the study.
A NONPARAMETRIC APPROACH TO SHORT-RUN PRODUCTION ANALYSIS IN A DYNAMIC CONTEXT
Creators: name: Silva, Elvira
name: Silva, Elvira
Publisher: name: Unknown
Year: 1999
Subjects: subject: Productivity Analysis
subject: Research Methods/ Statistical Methods
subject: nonparametric revealed-preference approach
subject: short-run production analysis
subject: long-run adjustment
subject: adjustment cost.

description: A nonparametric approach to short-run production analysis from a cost and profit perspectives is developed in the context of an adjustment-cost model. The adjustment-cost hypothesis is incorporated in the theoretical framework in the form of the properties of the firm's technology with respect to the quasi-fixed factors. Nonparametric tests for consistency of a data series with short-run cost minimization and profit maximization are developed and the empirical implementation of these tests to U.S. agriculture is presented. The empirical evidence does not refute that agricultural producers behave collectively as if they were a short-run cost minimizing and profit maximizing firm.
HOW DOES GENDER AFFECT THE ADOPTION OF AGRICULTURAL INNOVATIONS? THE CASE OF IMPROVED MAIZE TECHNOLOGY IN GHANA
Creators: name: Morris, Michael L.
name: Doss, Cheryl R.
name: Morris, Michael L.
name: Doss, Cheryl R.
Publisher: name: Unknown
Year: 1999
Subjects: Research and Development/Tech Change/Emerging Technologies

description: Why do men and women adopt agricultural technologies at different rates? Evidence from Ghana suggests that gender-linked differences in the adoption of modern maize varieties and chemical fertilizer are not attributable to inherent characteristics of the technologies themselves but instead result from gender-linked differences in access to key inputs.
Probabilistic and Team PFIN-type Learning: General Properties
Creators: name: Ambainis, Andris
Publisher: name: arXiv
Year: 2005
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: F.1.1, I.2.6

description: We consider the probability hierarchy for Popperian FINite learning and study the general properties of this hierarchy. We prove that the probability hierarchy is decidable, i.e. there exists an algorithm that receives p_1 and p_2 and answers whether PFIN-type learning with the probability of success p_1 is equivalent to PFIN-type learning with the probability of success p_2. To prove our result, we analyze the topological structure of the probability hierarchy. We prove that it is well-ordered in descending ordering and order-equivalent to ordinal epsilon_0. This shows that the structure of the hierarchy is very complicated. Using similar methods, we also prove that, for PFIN-type learning, team learning and probabilistic learning are of the same power.
description: 49 pages, 1 figure, journal version of COLT'96 paper
A theory of electromagnetic fluctuations for metallic surfaces and van der Waals interactions between metallic bodies
Creators: name: Bimonte, Giuseppe
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A new general expression is derived for the fluctuating electromagnetic field outside a metal surface, in terms of its surface impedance. It provides a generalization to real metals of Lifshitz theory of molecular interactions between dielectric solids. The theory is used to compute the radiative heat transfer between two parallel metal surfaces at different temperatures. It is shown that a measurement of this quantity may provide an experimental resolution of a long-standing controversy about the effect of thermal corrections on the Casimir force between real metal plates.
description: 4 pages, 2 figures; typos corrected, minor changes to match the published version in Physical Review Letters
THE IMPACTS OF SELF-SUFFICIENCY POLICIES AND FISCAL DECENTRALIZATION ON THE EFFICIENCY OF GRAIN PRODUCTION IN CHINA
Creators: name: Estrin, Andrew J.
name: Estrin, Andrew J.
Publisher: name: Unknown
Year: 1999
Subjects: subject: Agricultural and Food Policy
subject: Productivity Analysis
subject: China grain efficiency

description: This paper tests the hypotheses that grain self-sufficiency policies and fiscal decentralization result in inefficiency in grain production in China. Households supply grain in order to comply with self-sufficiency policies rather than to maximize profits. This raises the possibility that grain production is inefficient - especially where the opportunity costs are high (Turner, Brandt, and Rozelle). In addition, fiscal decentralization results in inefficiency in low-income provinces where the small A multiple output distance function is used to derive expressions for a stochastic production frontier and economic inefficiency. Provincial level data for grain and rural industrial output are used in the analysis and local fiscal expenditures and revenues are used as explanators of inefficiency. The expressions are estimated simultaneously using maximum likelihood techniques. The findings suggest that grain production in China could be made more efficient by: 1.) policies that encourage production according to comparative advantage rather than grain self-sufficiency and, 2.) fiscal reforms that increase the responsibility of the central government for agricultural investment.
Electronic inhomogeneity and competing phases in electron-doped superconducting Pr0.88LaCe0.12CuO4
Creators: name: Dai, Pengcheng
name: Kang, H. J.
name: Mook, H. A.
name: Matsuura, M.
name: Lynn, J. W.
name: Kurita, Y.
name: Komiya, Seiki
name: Ando, Yoichi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use neutron scattering to demonstrate that electron-doped superconducting Pr0.88LaCe0.12CuO4 in the underdoped regime is electronically phase separated in the ground state, showing the coexistence of a superconducting phase with a three-dimensional antiferromagnetically ordered phase and a quasi-two-dimensional spin density wave modulation. The Neel temperature of both antiferromagnetic phases decreases linearly with increasing superconducting transition temperature (Tc) and vanishes when optimal superconductivity is achieved. These results indicate that the electron-doped copper oxides are close to a quantum critical point, where the delicate energetic balance between different competing states leads to microscopic heterogeneity.
description: 14 pages, 4 figures, accepted to Phys. Rev. B as a rapid communication
Universality of Highly Damped Quasinormal Modes for Single Horizon Black Holes
Creators: name: Daghigh, Ramin G.
name: Kunstatter, Gabor
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It has been suggested that the highly damped quasinormal modes of black holes provide information about the microscopic quantum gravitational states underlying black hole entropy. This interpretation requires the form of the highly damped quasinormal mode frequency to be universally of the form: $\hbarω_R = \ln(l)kT_{BH}$, where $l$ is an integer, and $T_{BH}$ is the black hole temperature. We summarize the results of an analysis of the highly damped quasinormal modes for a large class of single horizon, asymptotically flat black holes.
description: 9 pages, 1 figure, submitted to the proceedings of Theory CANADA 1, which will be published in a special edition of the Canadian Journal of Physics
The Many Faces of Equality
Creators: name: Higgins, Mark
Publisher: name: National Teaching Repository
Year: 2024
Subjects: classificationCode: 390303
subject: Higher education

description: The many faces of equalityPaper first presented at UNESCO’s 4th AI4IA Conference (September 2023) by Mark Higgins.The original lecture at which an abridged version of this paper was presented as part of the 4th annual Unesco AI4IA (Artificial Intelligence for Information Accessibility) Conference can be viewed online at: the AI4IA Youtube channel
DOI: 10.25416/NTR.24982080
Synthesis and characterization of Na03RhO206H2O - a semiconductor with a weak ferromagnetic component
Creators: name: Park, S.
name: Kang, K.
name: Si, W.
name: Yoon, W. -S.
name: Lee, Y.
name: Moodenbaugh, A. R.
name: Lewis, L. H.
name: Vogt, T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have prepared the oxyhydrate Na03RhO206H2O by extracting Na+ cations from NaRhO2 and intercalating water molecules using an aqueous solution of Na2S2O8. Synchrotron X-ray powder diffraction, thermogravimetric analysis (TGA), and energy-dispersive x-ray analysis (EDX) reveal that a non-stoichiometric Na03(H2O)06 network separates layers of edge-sharing RhO6 octahedra containing Rh3+(4d6, S=0) and Rh4+ (4d5, S=1/2). The resistivities of NaRhO2 and Na03RhO206H2O (T < 300) reveal insulating and semi-conducting behavior with activation gaps of 134 meV and 7.8 meV, respectively. Both Na03RhO206H2O and NaRhO2 show paramagnetism at room temperature, however, the sodium-deficient sample exhibits simultaneously a weak but experimentally reproducible ferromagnetic component. Both samples exhibit a temperature-independent Pauli paramagnetism, for NaRhO2 at T > 50 K and for Na03RhO206H2O at T > 25 K. The relative magnitudes of the temperature-independent magnetic susceptibilities, that of the oxide sample being half that of the oxyhydrate, is consistent with a higher density of thermally accessible electron states at the Fermi level in the hydrated sample. At low temperatures the magnetic moments rise sharply, providing evidence of localized and weakl -ordered electronic spins.
description: 15 fages 5 figures Solid State Communications in print
A FAMILY OF AGRONOMIC PRODUCTION FUNCTIONS WITH ECONOMIES OF SCOPE
Creators: name: Lloyd, Peter J.
name: Lloyd, Peter J.
Publisher: name: Unknown
Year: 1989
Subjects: Industrial Organization
Research Methods/ Statistical Methods

description: This paper derives a family of multiple-output multiple-input production functions from the underlying technologies. These technologies are represented by average yield functions for each of the commodities (crops) produced from a common pool of resources. The production functions are implicitly separable. Examples include the CRETH, translog, generalised power and generalised McFadden functions. Moreover, given a function which is a member of this family, the individual commodity yield and production functions can be recovered. Such implicitly separable multiple-output production functions may exhibit economies or diseconomies of scope which reflect the interactions between outputs sharing a common pool of resources.
Short-pulse photoassociation in rubidium below the D$_1$ line
Creators: name: Koch, Christiane P.
name: Kosloff, Ronnie
name: Masnou-Seeuws, Françoise
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Photoassociation of two ultracold rubidium atoms and the subsequent formation of stable molecules in the singlet ground and lowest triplet states is investigated theoretically. The method employs laser pulses inducing transitions via excited states correlated to the $5S+5P_{1/2}$ asymptote. Weakly bound molecules in the singlet ground or lowest triplet state can be created by a single pulse while the formation of more deeply bound molecules requires a two-color pump-dump scenario. More deeply bound molecules in the singlet ground or lowest triplet state can be produced only if efficient mechanisms for both pump and dump steps exist. While long-range $1/R^3$-potentials allow for efficient photoassociation, stabilization is facilitated by the resonant spin-orbit coupling of the $0_u^+$ states. Molecules in the singlet ground state bound by a few wavenumbers can thus be formed. This provides a promising first step toward ground state molecules which are ultracold in both translational and vibrational degrees of freedom.
Arkiv_oral history article.pdf
Creators: name: Silva, Andrea Da
Publisher: name: figshare
Year: 2021
Subjects: History

description: THE FAMILY IS AT THE CENTER of the project, which is a historical starting point for transparency in the migration process. I have collected interviews with people who come from Chile and live in Gävle and saved their life stories on audio files.The purpose of the project was to increase the understanding of what it means to come to Sweden as an immigrant and to highlight the difficultiesthey meet. The project gave the older participants an opportunity to look back on their lives, and to give the younger ones valuable information. In this way, these people get their own storyand identity. The project can also give society tools to act more effectively in the event of difficulties that may arise during migration.
ECONOMIC OPTIMISATION OF SPRINKLER IRRIGATION CONSIDERING UNCERTAINTY OF SPATIAL WATER DISTRIBUTION
Creators: name: Feinerman, Eli
name: Shani, Y.
name: Bresler, E.
name: Feinerman, Eli
name: Shani, Y.
name: Bresler, E.
Publisher: name: Unknown
Year: 1989
Subjects: Land Economics/Use
Risk and Uncertainty

description: The study is focused on the development and the application of a stochastic economic optimisation model by which optimal levels of applied water and sprinkler spacing are determined. Data on crop-water production function and uniformity of water application are taken from a sprinkler irrigation plot of sweet corn. It was found that a saving of irrigation water can be achieved not only by raising water prices but also by increasing application uniformity.
Neuhäusler, Engelbert / Gössmann, Elisabeth (Hrsg.), Was ist Theologie?
Creators: name: Kantzenbach, Friedrich Wilhelm
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 16 Nr. 2 (1967): Ökumenische Rundschau, Band 16, Heft 2
Openings in the forest economy : a case study of small forest operators in the Bulkley Valley, BC, Canada
Creators: name: Bronson, Elizabeth Anne
Publisher: name: University of British Columbia
Year: 2009

description: The thesis is an exploration of the current role of the small business forest sector in hinterland forest communities, and the extent to which their economic and social positions correspond to the role envisioned for them by two prevailing visions of the future of the forest industry. One, advocated by Canadian political economists, predicts a continuation, indeed an intensification of corporate concentration, with attendant downsizing and job losses. Corporate restructuring is seen in part to induce small business development, through subcontracting arrangements and local entrepreneurialism, as a response to losses of core forest industry jobs. The second interpretation, advocated by the alternative forestry school, views the current crisis in the forest industry as an opportunity to return to decentralised approaches to ecologically-based forest management which encourage 'democracy in the forests', leading to community and environmental sustainability. Local entrepreneurs are an important part of this new 'value-based' forest economy. Interviews with small forest operators reveal a diversity of economic and social identities that do not conform well to either of the positions ascribed to small business by the Canadian political economy or alternative forestry literatures. The representations of small business found in these two literatures homogenize and suppress this diversity, making it difficult to 'see' small forest operators as anything other than contractors to the conventional system of corporate forestry, or alternative operators in an ecosystem- and community-based forest economy. In the place of these singular, marginalizing representations, I argue, using poststructural and feminist approaches to economic geography, for a 'third way' of exploring small forest operator subjectivities through overdetermined multiple class processes. Exploring small forest operator identity through multiple class processes avoids the essentialism found in fixed representations. It recognizes the transformative potential of small business in the forest economy, without denying the potential for exploitation that exists both within small business and corporate forestry. Class processes rendered invisible in the Canadian political economy and alternative forestry narratives, such as unpaid labour performed by family members and volunteer work in local planning processes, as well as work performed for wages and profit, are considered in this multiple class processes approach.
The photoelectric effect in external fields
Creators: name: Bracher, Christian
name: Delos, John B.
name: Kanellopoulos, Vassiliki
name: Kleber, Manfred
name: Kramer, Tobias
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Atoms and negative ions interacting with laser photons yield a coherent source of photoelectrons. Applying external fields to photoelectrons gives rise to interesting and valuable interference phenomena. We analyze the spatial distribution of the photocurrent using elementary quantum methods. The photoelectric effect is shown to be an interesting example for the use of coherent particle sources in quantum mechanics.
description: Contribution to the Einstein special issue, slightly updated references
THE EEC SHEEPMEAT MARKET AND VOLUNTARY EXPORT RESTRAINT AGREEMENTS
Creators: name: Blyth, Nicola
name: Blyth, Nicola
Publisher: name: Unknown
Year: 1984
Subjects: subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business

description: Voluntary export restraint agreements are an increasingly common measure used to restrict international trade in particular commodities. They have been applied to the EEC sheepmeat market since 1980 as part of the Common Agricultural Policy. In this paper, theoretical implications of voluntary export restraints are analysed and compared with alternative trade barriers, such as variable levies. The effects of the various trade barriers which the EEC could impose on sheepmeat imports are quantified using an econometric model of the world sheepmeat market. From the exporters' viewpoint, voluntary export restraints are shown to be the least harmful form of providing protection against imports into the EEC.
DFR Perturbative Quantum Field theory on Quantum Space Time, and Wick Reduction
Creators: name: Piacitelli, Gherardo
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the perturbative approach a` la Dyson to a quantum field theory with nonlocal self-interaction :phi*...*phi:, according to Doplicher, Fredenhagen and Roberts (DFR). In particular, we show that the Wick reduction of non locally time--ordered products of Wick monomials can be performed as usual, and we discuss a very simple Dyson diagram.
description: 15 pages, pdf has active hyperlinks. To appear in the proceedings of the conference on "Rigorous quantum Field Theory", held at Saclay on July 19-21, 2004, on the occasion of Jacques Bros' 70th birthday
THE ECONOMICS OF INSURING CROPS AGAINST DROUGHT
Creators: name: Bardsley, Peter
name: Abey, Arun
name: Davenport, Scott V.
name: Bardsley, Peter
name: Abey, Arun
name: Davenport, Scott V.
Publisher: name: Unknown
Year: 1984
Subjects: Risk and Uncertainty

description: The necessary conditions for the existence of a financially viable crop insurance scheme against drought are examined. A supply and demand model for crop insurance is developed which identifies the parameters that are critical to the efficiency of such a scheme. The values of these parameters are estimated by using data from the Australian wheat industry. It is found that crop insurance against drought would appear to be unattractive from an efficiency point of view.
Atmospheric Turbulence Compensation with Laser Phase Shifting Interferometry
Creators: name: Rabien, S.
name: Eisenhauer, F.
name: Genzel, R.
name: Davies, R. I.
name: Ott, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Laser guide stars with adaptive optics allow astronomical image correction in the absence of a natural guide star. Single guide star systems with a star created in the earth's sodium layer can be used to correct the wavefront in the near infrared spectral regime for 8-m class telescopes. For possible future telescopes of larger sizes, or for correction at shorter wavelengths, the use of a single guide star is ultimately limited by focal anisoplanatism that arises from the finite height of the guide star. To overcome this limitation we propose to overlap coherently pulsed laser beams that are expanded over the full aperture of the telescope, traveling upwards along the same path which light from the astronomical object travels downwards. Imaging the scattered light from the resultant interference pattern with a camera gated to a certain height above the telescope, and using phase shifting interferometry we have found a method to retrieve the local wavefront gradients. By sensing the backscattered light from two different heights, one can fully remove the cone effect, which can otherwise be a serious handicap to the use of laser guide stars at shorter wavelengths or on larger telescopes. Using two laser beams multiconjugate correction is possible, resulting in larger corrected fields. With a proper choice of laser, wavefront correction could be expanded to the visible regime and, due to the lack of a cone effect, the method is applicable to any size of telescope. Finally the position of the laser spot could be imaged from the side of the main telescope against a bright background star to retrieve tip-tilt information, which would greatly improve the sky coverage of the system.
description: 11 pages, 10 figures
USUFRUCT AND USURY: AN ANALYSIS OF LAND LEASING IN EAST JAVA
Creators: name: Sturgess, Neil H.
name: Wijaya, Hesti R.
name: Dow, N.
name: Sturgess, Neil H.
name: Wijaya, Hesti R.
name: Dow, N.
Publisher: name: Unknown
Year: 1984
Subjects: Land Economics/Use

description: On Java, land leasing functions as a credit instrument when the entire rent is paid in advance. The rights obtained by the tenant/lender are the 'price' of the loan made to the land owner/borrower. A model of such transactions shows that the area leased and duration of the lease are substitutes in raising a loan of given size and that the substitution rate is related to the term structure of interest rates.
Almost maximally almost-periodic group topologies determined by T-sequences
Creators: name: Lukács, Gábor
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Topology (math.GN)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 22A05, 54A20, 22C05, 20K45, 54H11

description: A sequence $\{a_n\}$ in a group $G$ is a {\em $T$-sequence} if there is a Hausdorff group topology $τ$ on $G$ such that $a_n\stackrelτ\longrightarrow 0$. In this paper, we provide several sufficient conditions for a sequence in an abelian group to be a $T$-sequence, and investigate special sequences in the Prüfer groups $\mathbb{Z}(p^\infty)$. We show that for $p\neq 2$, there is a Hausdorff group topology $τ$ on $\mathbb{Z}(p^\infty)$ that is determined by a $T$-sequence, which is close to being maximally almost-periodic--in other words, the von Neumann radical $\mathbf{n}(\mathbb{Z}(p^\infty),τ)$ is a non-trivial finite subgroup. In particular, $\mathbf{n}(\mathbf{n}(\mathbb{Z}(p^\infty),τ)) \subsetneq \mathbf{n}(\mathbb{Z}(p^\infty),τ)$. We also prove that the direct sum of any infinite family of finite abelian groups admits a group topology determined by a $T$-sequence with non-trivial finite von Neumann radical.
description: v2 - accepted (discussion on non-abelian case is removed, replaced by new results on direct sums of finite abelian groups)
MADAGASCAR
Creators: name: Beintema, Nienke M.
name: Magalhaes, Eduardo Castelo
name: Randriamanamisa, Rivonjaka
name: Beintema, Nienke M.
name: Magalhaes, Eduardo Castelo
name: Randriamanamisa, Rivonjaka
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This brief reviews the major investment and institutional trends in Madagascan public agricultural research since the early 1990s, drawing directly on a new set of survey data collected through the Agricultural Science and Technology Indicators (ASTI) initiative.
Angular magnetoresistance oscillations in bilayers in tilted magnetic fields
Creators: name: Yakovenko, Victor M.
name: Cooper, Benjamin K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Angular magnetoresistance oscillations (AMRO) were originally discovered in organic conductors and then found in many other layered metals. It should be possible to observe AMRO to semiconducting bilayers as well. Here we present an intuitive geometrical interpretation of AMRO as the Aharonov-Bohm interference effect, both in real and momentum spaces, for balanced and imbalanced bilayers. Applications to the experiments with bilayers in tilted magnetic fields in the metallic state are discussed. We speculate that AMRO may be also observed when each layer of the bilayer is in the composite-fermion state.
description: 4 pages, 5 figures, Proceedings of EP2DS-16. V.2: figures corrected, one reference added. V3: one reference added
TANZANIA
Creators: name: Beintema, Nienke M.
name: Ngahulira, Thomas
name: Kirway, Timothy
name: Beintema, Nienke M.
name: Ngahulira, Thomas
name: Kirway, Timothy
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in Tanzanian public agricultural research since the early 1990s using new survey data collected under the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR–ASARECA 2001–02).
COTE D'IVOIRE
Creators: name: Stads, Gert-Jan
name: Beintema, Nienke M.
name: Stads, Gert-Jan
name: Beintema, Nienke M.
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in agricultural research in Côte d’Ivoire using new survey data for the 1990s collected under the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI-ISNAR-CORAF 2002) and various secondary sources.
LA MAURITANIE
Creators: name: Stads, Gert-Jan
name: Lo, Abdoulaye
name: Diallo, Boubacar Cisse
name: Stads, Gert-Jan
name: Lo, Abdoulaye
name: Diallo, Boubacar Cisse
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: Le présent document étudie les principaux investissements réalisés dans la recherche agricole publique en Mauritanie et les tendances institutionnelles apparues dans ce domaine depuis le début des années 90, sur la base de nouvelles données d’enquête rassemblées dans le cadre du projet conjoint (IFPRI–ISNAR–CORAF/WECARD 2002–03) sur les indicateurs relatifs aux sciences et technologies agricoles (ASTI).
Developing strategies to optimize the anchorage between electrospun nanofibers and hydrogel for multi-layered plasmonic biomaterials
Creators: name: Pierini, Filippo
Publisher: name: Zenodo
Year: 2024

description: Polycaprolactone (PCL), a recognized biopolymer, has emerged as a prominent choice for diverse biomedical endeavors due to its good mechanical properties, exceptional biocompatibility, and tunable properties. These attributes render PCL a suitable alternative biomaterial to use in biofabrication, especially the electrospinning technique, facilitating the production of nanofibers with varied dimensions and functionalities. However, the inherent hydrophobicity of PCL nanofibers can pose limitations. Conversely, acrylamide-based hydrogels, characterized by their interconnected porosity, significant water retention, and responsive behavior, present an ideal matrix for numerous biomedical applications. By merging these two materials, one can harness their collective strengths while potentially mitigating individual limitations. A robust interface and effective anchorage during the composite fabrication are pivotal for the optimal performance of the nanoplatforms. Nanoplatforms are subject to varying degrees of tension and physical alterations depending on their specific applications. This is particularly pertinent in the case of layered nanostructures, which require careful consideration to maintain structural stability and functional integrity in their intended applications. In this study, we delve into the influence of the fiber dimensions, orientation and surface modifications of the nanofibrous layer and the hydrogel layer's crosslinking density on their intralayer interface to determine the optimal approach. Comprehensive mechanical pull-out tests offer insights into the interfacial adhesion and anchorage between the layers. Notably, plasma treatment of the hydrophobic nanofibers and the stiffness of the hydrogel layer significantly enhance the mechanical effort required for fiber extraction from the hydrogels, indicating improved anchorage. Furthermore, biocompatibility assessments confirm the potential biomedical applications of the proposed nanoplatforms.
LE TOGO
Creators: name: Stads, Gert-Jan
name: Adomefa, Kossi
name: Stads, Gert-Jan
name: Adomefa, Kossi
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: Le présent document étudie les principaux investissements réalisés dans la recherche agricole publique ainsi que les tendances institutionnelles apparues dans ce domaine depuis le début des années 70 et inclut pour les années 90 de nouvelles données d’enquête rassemblées dans le cadre du projet conjoint (IFPRI–ISNAR–CORAF/WECARD 2002–03) sur les indicateurs relatifs aux sciences et technologies agricoles (ASTI).
Pair counting, pion-exchange forces, and the structure of light nuclei
Creators: name: Wiringa, R. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A simple but useful guide for understanding the structure of light nuclei is presented. It is based on counting the number of interacting pairs in different spin-isospin (S,T) states for a given spatial symmetry, and estimating the overall binding according to the sum of sigma_i.sigma_j tau_i.tau_j expectation values, as suggested by one-pion-exchange. Applied to s- and p-shell nuclei, this simple picture accounts for the relative stability of nuclei as A increases and as T changes across isobars, the saturation of nuclear binding in the p-shell, and the tendency to form d, t, or alpha subclusters there. With allowance for pairwise tensor and spin-orbit forces, which are also generated or boosted by pion-exchange, the model explains why mixing of different spatial symmetries in ground states increases as T increases across isobars, and why for states of the same spatial symmetry, the ones with greater S are lower in the spectrum. The ordering of some sd-shell intruder levels can also be understood. The success of this simple model supports the idea that one-pion-exchange is the dominant force controlling the structure of light nuclei.
description: 20 pages, 7 figures
Thermodynamics, Structure, and Dynamics of Water Confined between Hydrophobic Plates
Creators: name: Kumar, Pradeep
name: Buldyrev, Sergey V.
name: Starr, Francis W.
name: Giovambattista, Nicolas
name: Stanley, H. Eugene
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We perform molecular dynamics simulations of 512 water-like molecules that interact via the TIP5P potential and are confined between two smooth hydrophobic plates that are separated by 1.10 nm. We find that the anomalous thermodynamic properties of water are shifted to lower temperatures relative to the bulk by $\approx 40$ K. The dynamics and structure of the confined water resemble bulk water at higher temperatures, consistent with the shift of thermodynamic anomalies to lower temperature. Due to this $T$ shift, our confined water simulations (down to $T = 220$ K) do not reach sufficiently low temperature to observe a liquid-liquid phase transition found for bulk water at $T\approx 215$ K using the TIP5P potential. We find that the different crystalline structures that can form for two different separations of the plates, 0.7 nm and 1.10 nm, have no counterparts in the bulk system, and discuss the relevance to experiments on confined water.
description: 31 pages, 14 figures
Schultz, Hans Jürgen (Hrsg.), Tendenzen der Theologie im 20. Jahrhundert
Creators: name: Schulz, Otmar
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 16 Nr. 2 (1967): Ökumenische Rundschau, Band 16, Heft 2
Comment on ``Hausdorff Dimension of Critical Fluctuations in Abelian Gauge Theories"
Creators: name: Prokof'ev, Nikolay
name: Svistunov, Boris
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Hove, Mo, and Sudbo [Phys. Rev. Lett. 85, 2368 (2000)] derived a simple connection, $η+ D_H = 2$, between the anomalous scaling dimension $η$ of the U(1) universality class order parameter and the Hausdorff dimension $D_H$ of critical loops in loop representations of U(1) models. We show that the above relation is wrong and establish a correct relation that contains a new critical exponent.
description: In 1 revtex page with 1 figure
NIGERIA
Creators: name: Beintema, Nienke M.
name: Ayoola, Gbolagade Babalola
name: Beintema, Nienke M.
name: Ayoola, Gbolagade Babalola
Publisher: name: Unknown
Year: 2004
Subjects: Research and Development/Tech Change/Emerging Technologies

description: This country brief reviews the major investment and institutional trends in Nigeria’s agricultural research system since the early 1970s, including a new set of survey data for the 1990s collected through the Agricultural Science and Technology Indicators (ASTI) initiative (IFPRI–ISNAR 2001–02).
Zero-norm states and stringy symmetries
Creators: name: Chan, Chuan-Tsung
name: Ho, Pei-Ming
name: Lee, Jen-Chi
name: Teraguchi, Shunsuke
name: Yi-Yang
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We identify spacetime symmetry charges of 26D open bosonic string theory from an infinite number of zero-norm states (ZNS) with arbitrary high spin in the old covariant first quantized string spectrum. We give various evidences to support this identification. These include massive sigma-model calculation, Witten string field theory calculation, 2D string theory calculation and, most importantly, three methods of high-energy stringy scattering amplitude calculations. The last calculations explicitly prove Gross's conjectures in 1988 on high energy symmetry of string theory.
description: 6 pages. Talks presented by Jen-Chi Lee at XXVIII Spanish Relativity Meeting (ERE2005),"A Century of Relativity Physics",Oviedo,Spain,6-10 Sep 2005 and "4th Meeting on constrained Dynamics and Quantum Gravity",Cala Gonone,Sardinia,Italy,12-16 Sep 2005. To appear in the Journal of Physics: Conference Series
Dynamical dark energy or variable cosmological parameters?
Creators: name: Sola, Joan
name: Stefancic, Hrvoje
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: One of the main aims in the next generation of precision cosmology experiments will be an accurate determination of the equation of state (EOS) for the dark energy (DE). If the latter is dynamical, the resulting barotropic index ωshould exhibit a non-trivial evolution with the redshift. Usually this is interpreted as a sign that the mechanism responsible for the DE is related to some dynamical scalar field, and in some cases this field may behave non-canonically (phantom field). Present observations seem to favor an evolving DE with a potential phantom phase near our time. In the literature there is a plethora of dynamical models trying to describe this behavior. Here we show that the simplest option, namely a model with a variable cosmological term, Λ=Λ(t), leads in general to a non-trivial effective EOS, with index ω_e, which may naturally account for these data features. We prove that in this case there is always a ``crossing'' of the ω_e=-1 barrier near our time. We also show how this effect is modulated (or even completely controled) by a variable Newton's constant G=G(t).
description: LaTeX, 15 pages, discussion extended, one figure and references added, version accepted for publication in Mod. Phys. Lett. A
LA COTE D'IVOIRE
Creators: name: Stads, Gert-Jan
name: Beintema, Nienke M.
name: Stads, Gert-Jan
name: Beintema, Nienke M.
Publisher: name: Unknown
Year: 2003
Subjects: Research and Development/Tech Change/Emerging Technologies

description: Le présent document étudie les principaux investissements réalisés dans la recherche agricole en Côte d’Ivoire et les tendances institutionnelles apparues dans ce domaine en se basant sur de nouvelles données d’enquête se rapportant aux années 90 rassemblées dans le cadre du projet conjoint (IFPRI-ISNAR-CORAF/WECARD 2002) sur les indicateurs relatifs aux sciences et technologies agricoles (ASTI) ainsi que sur diverses autres sources secondaires.