cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The International Trends in Plant Variety Protection
Creators: name: Srinivasan, Chittur S.
name: Srinivasan, Chittur S.
Publisher: name: Unknown
Year: 2005
Subjects: subject: Crop Production/Industries
subject: International Relations/Trade
subject: Intellectual Property Rights
subject: Plant Variety Protection

description: This paper examines international trends in plant variety protection, a form of intellectual property rights for plant varieties akin to patents. The TRIPs Agreement under the WTO has given a strong impetus for the universalisation of plant variety protection regimes with common standards of protection across countries. This paper argues that developed and developing countries are likely to adopt widely divergent approaches to the development of intellectual property rights for plant varieties. The special features of plant variety protection constrain the appropriability of economic returns from protected plant varieties. Consequently, in developed countries PVP is being seen as a relatively weak intellectual property right instrument. As stronger forms of protection for plant varieties become available, the importance of plant variety protection in developed countries may decline. Developing countries continue to debate the merits of extending intellectual property rights to agriculture, though they too are obliged under the TRIPs Agreement to protect plant varieties. Their concerns are focused on the “inequities” inherent in a system of plant breeders’ rights. Attempts by developing countries to incorporate farmers’ rights provisions in their PVP systems are likely to dilute the incentives for private investment in plant breeding.
Dark matter distribution in the Draco dwarf from velocity moments
Creators: name: Lokas, Ewa L.
name: Mamon, Gary A.
name: Prada, Francisco
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the distribution of dark matter in the Draco dwarf spheroidal galaxy by modelling the moments of the line-of-sight velocity distribution of stars obtained from new velocity data of Wilkinson et al. The luminosity distribution is approximated by a Sersic profile fitted to the data by Odenkirchen et al. We assume that the dark matter density profile is given by a formula with an inner cusp and an outer exponential cut-off, as recently proposed by Kazantzidis et al. as a result of simulations of tidal stripping of dwarfs by the potential of the Milky Way. The dark matter distribution is characterized by the total dark mass and the cut-off radius. The models have arbitrary velocity anisotropy parameter assumed to be constant with radius. We estimate the three parameters by fitting both the line-of-sight velocity dispersion and kurtosis profiles, which allows us to break the degeneracy between the mass distribution and velocity anisotropy. The results of the fitting procedure turn out to be very different depending on the stellar sample considered, that is on our choice of stars with discrepant velocities to be discarded as interlopers. For our most reliable sample, the model parameters remain weakly constrained, but the robust result is the preference for weakly tangential stellar orbits and high mass-to-light ratios. The best-fitting total mass is then 7 10^7 M_sun, much lower than recent estimates, while the mass-to-light ratio is M/L_V = 300 and almost constant with radius. If the binary fraction in the stellar population of Draco turns out to be significant, the kurtosis of the global velocity distribution will be smaller and the orbits inferred will be more tangential, while the resulting mass estimate lower.
description: 11 pages, 8 figures, accepted for publication in MNRAS
Trion dynamics in coupled double quantum wells. Electron density effects
Creators: name: Aceituno, P.
name: Hernandez-Cabrera, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have studied the coherent dynamics of injected electrons when they are either free or bounded both in excitons and in trions (charged excitons). We have considered a remotely doped asymmetric double quantum well where an excess of free electrons and the direct created excitons generate trions. We have used the matrix density formalism to analyze the electron dynamics for different concentration of the three species. Calculations show a significant modification of the free electron inter-sublevel oscillations cWe have studied the coherent dynamics of injected electrons when they are aused by electrons bound in excitons and trions. Based on the present calculations we propose a method to detect trions through the emitted electromagnetic radiation or the current density.
description: 14 pages, 13 figures
Mercury Equation of center - al-Battani by van Dalen (Benno) and Pedersen (Fritz S.) (2008) | Type-B (ID n° 834)
Creators: name: van Dalen (Benno) and Pedersen, Fritz S.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2022
Subjects: Astronomy
History of astronomy
DISHAS
Astronomical table

description: This is a type B edition: A type-B edition corresponds to a critical edition of several table witnesses:
 it is based on several different editions, themselves based on tables from different primary sources.
 A type-B edition can be based on type-A, type-B or type-C editions.
You can find it on the DISHAS project website from this link: https://dishas.obspm.fr/table-edition/834
A Chandra X-ray Investigation of the Violent Interstellar Medium: From Dwarf Starbursts to Ultraluminous Infrared Galaxies
Creators: name: Grimes, J. P.
name: Heckman, T.
name: Strickland, D.
name: Ptak, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have analyzed observations with the Chandra X-ray Observatory of the diffuse emission by hot gas in 7 dwarf starburst galaxies, 6 edge-on starburst galaxies, and 9 Ultra Luminous Infrared Galaxies. These systems cover ranges of \~ 10^4 in X-ray luminosity and several thousand in star formation rate and K-band luminosity (a proxy for stellar mass). Despite this range in fundamental parameters, we find that the properties of the diffuse X-ray emission are very similar in all three classes of starburst galaxies. The spectrum of the diffuse emission is well fit by thermal emission from gas with kT ~ 0.25 to 0.8 keV and with several-times-solar abundance ratios of alpha elements to Fe. The ratio of the thermal X-ray to far-infrared luminosity is roughly constant, as is the characteristic surface brightness of the diffuse X-ray emission. The size of the diffuse X-ray source increases systematically with both far-infrared and K-Band luminosity. All three classes show strong morphological relationships between the regions of hot gas probed by the diffuse X-ray emission and the warm gas probed by optical line emission. These findings suggest that the same physical mechanism is producing the diffuse X-ray emission in the three types of starbursts, and are consistent with that mechanism being shocks driven by a galactic "superwind'' powered by the kinetic energy collectively supplied by stellar winds and supernovae in the starburst.
description: 37 pages, 13 figures
Local distortions and dynamics in hydrated Y-doped BaZrO$_3$
Creators: name: Torayev, Amangeldi
name: Sperrin, Luke
name: Gomez, Maria A.
name: Kattirtzi, John A.
name: Merlet, Céline
name: Grey, Clare P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Y-doped BaZrO$_3$ is a promising proton conductor for intermediate temperature solid oxide fuel cells. In this work, a combination of static DFT calculations and DFT based molecular dynamics (DFT-MD) was used to study proton conduction in such a material. Geometry optimisations of 100 structures with a 12.5% dopant concentration allowed us to identify a clear correlation between the bending of the metal-oxygen-metal angle and the energies of the simulated cells. Depending on the type of bending, two configurations, designated as inwards bending and outwards bending, were defined. The results demonstrate that a larger bending decreases the energy and that the lowest energies are observed for structures combining inwards bending with protons being close to the dopant atoms. These lowest energy structures are the ones with the strongest hydrogen bonds. DFT-MD simulations in cells with different yttrium distributions provide complementary microscopic information on proton diffusion as they capture the dynamic distortions of the lattice caused by thermal motion. A careful analysis of the proton jumps between different environments confirmed that the inwards and outwards bending states are relevant for the understanding of proton diffusion. Indeed, intra-octahedral jumps were shown to only occur starting from an outwards configuration while the inwards configuration seems to favor rotations around the oxygen. On average, in the DFT-MD simulations, the hydrogen bond lengths are shorter for the outwards configuration which facilitates the intraoctahedral jumps. Diffusion coefficients and activation energies were also determined and compared to previous theoretical and experimental data showing a good agreement with previous data corresponding to local proton motion.
description: Preprint
Numerical continuum tensor networks in two dimensions
Creators: name: Haghshenas, Reza
name: Cui, Zhi-Hao
name: Chan, Garnet Kin-Lic
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe the use of tensor networks to numerically determine wave functions of interacting two-dimensional fermionic models in the continuum limit. We use two different tensor network states: one based on the numerical continuum limit of fermionic projected entangled pair states obtained via a tensor network formulation of multi-grid, and another based on the combination of the fermionic projected entangled pair state with layers of isometric coarse-graining transformations. We first benchmark our approach on the two-dimensional free Fermi gas then proceed to study the two-dimensional interacting Fermi gas with an attractive interaction in the unitary limit, using tensor networks on grids with up to 1000 sites.
description: 9 pages, 9 figures, sample source codes are available at https://github.com/rezah/cpeps
Transition from large-scale to small-scale dynamo
Creators: name: Ponty, Yannick
name: Plunian, Franck
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Geophysics (physics.geo-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The dynamo equations are solved numerically with a helical forcing corresponding to the Roberts flow. In the fully turbulent regime the flow behaves as a Roberts flow on long time scales, plus turbulent fluctuations at short time scales. The dynamo onset is controlled by the long time scales of the flow, in agreement with the former Karlsruhe experimental results. The dynamo mechanism is governed by a generalized $α$-effect which includes both usual $α$-effect and turbulent diffusion, plus all higher order effects. Beyond the onset we find that this generalized $α$-effect scales as $O(Rm^{-1})$ suggesting the take-over of small-scale dynamo action. This is confirmed by simulations in which dynamo occurs even if the large-scale field is artificially suppressed.
description: 4 pages, 3 figures
Additional file 10 of Managing clustering effects and learning effects in the design and analysis of multicentre randomised trials: a survey to establish current practice
Creators: name: Conroy, Elizabeth J.
name: Blazeby, Jane M.
name: Burnside, Girvan
name: Cook, Jonathan A.
name: Gamble, Carrol
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Science Policy

description: Additional file 10: Supplementary Table 6. Comments on interaction investigation in example scenarios (Question 9).
Sensitivity of a small matter-wave interferometer to gravitational waves
Creators: name: Foffa, Stefano
name: Gasparini, Alice
name: Papucci, Michele
name: Sturani, Riccardo
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the possibility of using matter wave interferometry techniques to build a gravitational wave detector. We derive the response function and find that it contains a term proportional to the derivative of the gravitational wave, a point which has been disputed recently. We then study in detail the sensitivity that can be reached by such a detector and find that, if it is operated near resonance, it can reach potentially interesting values in the high frequency regime. The correlation between two or more of such devices can further improve the sensitivity for a stochastic signal.
description: Revtex4, 19 pages, 3 figures. Several changes in the calculation of the response function. Accepted by PRD
Additional file 11 of Managing clustering effects and learning effects in the design and analysis of multicentre randomised trials: a survey to establish current practice
Creators: name: Conroy, Elizabeth J.
name: Blazeby, Jane M.
name: Burnside, Girvan
name: Cook, Jonathan A.
name: Gamble, Carrol
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Science Policy

description: Additional file 11: Supplementary Table 7. Details of how Units explore heterogeneity by centre in the presence of a treatment effect (Question 10a).
The Possibility of a Green Revolution in Sub-Saharan Africa: Evidence from Kenya
Creators: name: Otsuka, Keijiro
name: Yamano, Takashi
name: Otsuka, Keijiro
name: Yamano, Takashi
Publisher: name: Unknown
Year: 2005
Subjects: subject: International Development
subject: Green Revolution
subject: Agricultural Revolution
subject: Organic Green Revolution
subject: dairy cows
subject: manure
subject: chemical fertilizer
subject: maize yield

description: It is widely believed that a Green Revolution similar to the one achieved in Asia is impossible in Sub-Saharan Africa. Although grain yields have been stagnant in this region, there are some signs of the intensification of farming systems in the face of growing population pressure on limited land resources. In this paper we focus on the new farming system based on the use of manure produced by dairy cows, which may be termed an “Organic Green Revolution.” Using the farm household data collected from Kenya, this paper demonstrates that the Organic Green Revolution has a potential of doubling maize yields in highlands of Kenya.
Additional file 12 of Managing clustering effects and learning effects in the design and analysis of multicentre randomised trials: a survey to establish current practice
Creators: name: Conroy, Elizabeth J.
name: Blazeby, Jane M.
name: Burnside, Girvan
name: Cook, Jonathan A.
name: Gamble, Carrol
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Science Policy

description: Additional file 12: Supplementary Table 8. Details of how Units explore heterogeneity by treatment provider in the presence of a treatment effect (Question 10b).
New culture medium for micropropagation protocol of guava (Psidium guajava) seedlings, a plant with interest in cool subtropics
Creators: name: Michail, Ioanna
name: Ganopoulos, Ioannis
name: Tzatzani, Thiresia-Tereza
name: SARROY, EIRINI
name: Boutsika, Anastasia
Publisher: name: figshare
Year: 2022
Subjects: subject: 70302 Agronomy
subject: FOS: Agriculture, forestry and fisheries
subject: 70601 Horticultural Crop Growth and Development
subject: 70602 Horticultural Crop Improvement (Selection and Breeding)
subject: 70507 Tree Improvement (Selection and Breeding)

description: Psidium guajava is a new crop cultivated in Greece, with a potential pharmaceutical and ornamental uses. An efficient and reliable protocol for in vitro clonal propagation of P. guajava from seeds was developed examining five different media. We believe that our study makes a significant contribution to the literature because our findings have potential implications for the propagation of this plant species.
Quantum simulation of electronic structure with a transcorrelated Hamiltonian: improved accuracy with a smaller footprint on the quantum computer
Creators: name: Motta, Mario
name: Gujarati, Tanvi P.
name: Rice, Julia E.
name: Kumar, Ashutosh
name: Masteran, Conner
name: Latone, Joseph A.
name: Lee, Eunseok
name: Valeev, Edward F.
name: Takeshita, Tyler Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Quantum simulations of electronic structure with a transformed Hamiltonian that includes some electron correlation effects are demonstrated. The transcorrelated Hamiltonian used in this work is efficiently constructed classically, at polynomial cost, by an approximate similarity transformation with an explicitly correlated two-body unitary operator. This Hamiltonian is Hermitian, includes no more than two-particle interactions, and is free of electron-electron singularities. We investigate the effect of such a transformed Hamiltonian on the accuracy and computational cost of quantum simulations by focusing on a widely used solver for the Schrodinger equation, namely the variational quantum eigensolver method, based on the unitary coupled cluster with singles and doubles (q-UCCSD) Ansatz. Nevertheless, the formalism presented here translates straightforwardly to other quantum algorithms for chemistry. Our results demonstrate that a transcorrelated Hamiltonian, paired with extremely compact bases, produces explicitly correlated energies comparable to those from much larger bases. For the chemical species studied here, explicitly correlated energies based on an underlying 6-31G basis had cc-pVTZ quality. The use of the very compact transcorrelated Hamiltonian reduces the number of CNOT gates required to achieve cc-pVTZ quality by up to two orders of magnitude, and the number of qubits by a factor of three.
description: 13 pages, 7 figures
Spectral properties of Three-dimensional Magneto-hydrodynamical Accretion Flows
Creators: name: Ohsuga, K.
name: Kato, Y.
name: Mineshige, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In spite of a large number of global three-dimensional (3D) magneto-hydrodynamical (MHD) simulations of accretion flows and jets being made recently, their astrophysical relevance for realistic situations is not well known. In order to examine to what extent the simulated MHD flows can account for the observed spectral energy distribution (SED) of Sagittarius A* (Sgr A*), for the first time we calculate the emergent spectra from 3D MHD flows in a wide range of wavelengths (from radio to X-ray) by solving the 3D radiative transfer equations. We use the simulation data by Kato, Mineshige, and Shibata (2004) and perform Monte Carlo radiative transfer simulations, in which synchrotron emission/absorption, free-free emission/absorption, and Compton/inverse Compton scattering are taken into account. We assume two temperature plasmas and calculate electron temperatures by solving the electron energy equation. Only thermal electrons are considered. It is found that the 3D MHD flow generally over-produces X-rays by means of bremsstrahlung radiation from the regions at large radii. A flatter density profile, r^{-a} with a<1, than that of the advection-dominated accretion flow (ADAF), r^{-3/2}, is the main reason for this. If we restrict the size of the emission region to be as small as 10r_s, where r_s is the Schwarzschild radius, the MHD model can reproduce the basic features of the observed SED of Sgr A* during its flaring state. Yet, the spectrum in the quiescent state remains to be understood. We also calculate the time-dependent spectral changes, finding that the fluxes fluctuate in a wide range of the frequency and the flux at each wavelength does not always vary coherently.
description: 8 pages, 7 figures, accepted for publication in ApJ (Volume 627, July 10, 2005 issue)
The adoption and use of e-commerce technological artifacts : a similarity-consistency model and an empirical investigation
Creators: name: Al-Natour, Sameh
Publisher: name: University of British Columbia
Year: 2009

description: The goal of explaining user acceptance and continued use of information systems (IS) has taken center stage in IS research (Venkatesh et al., 2003). In recent publications, researchers have argued that websites should be designed with the goal of building relationships. Although such research has focused on relationship-building, the theories that have been utilized to explain this process have been static in nature, and many have been based on traditional models like TAM and TPB, which focus on the utilitarian benefits users receive from their interactions with technological artifacts. This research develops a new model for studying e-commerce relationships, proposing that technological artifacts are perceived as social actors, which can manifest social characteristics that interact with those of its users in a manner predicted by theories of interpersonal interaction. The model is then tested in an empirical study. Using an automated shopping assistant, the study investigates the effects of perceived measures and computed scores of both similarity and consistency on a number of dependent variables. Similarity and consistency have been both shown to be instrumental in predicting attraction and satisfaction in all forms of relationships. Furthermore, the study investigates the role of design characteristics, such as communication channel modality, the use of suggestive guidance and directives, and two different decision strategies, in forming social perceptions about the shopping assistant as well as shaping perceptions of consistency. Both similarity and consistency have positive effects on users' evaluations of automated shopping assistants. While the effects of consistency are stronger overall, two types of similarity (personality similarity and behavioral similarity) as well as two types of consistency (consistency across time and consistency across components) are shown to exert unique influences on evaluations of the shopping assistant, such as its trustworthiness, social presence, perceived enjoyment and perceived ease of use. Furthermore, the computed similarity measures were successful in predicting perceived similarity. Design choices, such as the use of decisional guidance, directives, and the elimination by aspect decision strategy, were effective in forming social perceptions of technological artifacts, which were found to be later used as bases for evaluating the artifact's similarity and consistency.
Non-Markovian memory in a measurement-based quantum computer
Creators: name: Filenga, D.
name: Mahlow, F.
name: Fanchini, F. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the exact open system dynamics of single qubit gates during a measurement-based quantum computation considering non-Markovian environments. We obtain analytical solutions for the average gate fidelities and analyze it for amplitude damping and dephasing channels. We show that the average fidelity is identical for the X-gate and Z-gate and that neither fast application of the projective measurements necessarily implies high gate fidelity, nor slow application necessarily implies low gate fidelity. Indeed, for highly non-Markovian environments, it is of utmost importance to know the best time to perform the measurements, since a huge variation in the gate fidelity may occur given this scenario. Furthermore, we show that while for the amplitude damping the knowledge of the dissipative map is sufficient to determine the best measurement times, i.e. the best times in which measures are taken, the same is not necessarily true for the phase damping. To the later, the time of the set of measures becomes crucial since a phase error in one qubit can fix the phase error that takes place in another.
description: 8 pages, 3 figures
Has Green Revolution Bypassed Coarse Cereals? The Indian Experience
Creators: name: Janaiah, Aldas
name: Achoth, Lalith
name: Bantilan, Ma Cynthia S.
name: Janaiah, Aldas
name: Achoth, Lalith
name: Bantilan, Ma Cynthia S.
Publisher: name: Unknown
Year: 2005
Subjects: subject: International Development
subject: Total factor productivity
subject: coarse cereals
subject: green revolution
subject: adoption rate
subject: India

description: This paper analysed the growth performance of non-rice crop sectors by estimating total factor productivity (TFP) growth for the selected coarse cereals viz., maize, sorghum and pearl millet in India. The analysis indicates that the TFP growth contributed substantially to the output growth of coarse cereals over the past three decades. The TFP growth was higher in those states where coverage of irrigation was relatively high. TFP grew at an average of 1.4 percent per annum through out the Green Revolution (GR) period for sorghum in the sate of Maharashtra where about half of the India’s sorghum area is concentrated mostly under rainfed conditions. Although small in absolute terms over the past three decades, the overall findings suggest that GR technologies have contributed considerably to output growth of coarse cereals. The contribution of technological progress was considerably higher in those regions where MVs were adopted under irrigated/semi-irrigated conditions. This TFP’s contribution could further be seen more visibly if some irrigation and policy support are also provided to the coarse cereals.
INTEGRAL discovery of persistent hard X-ray emission from the Soft Gamma Ray Repeater SGR 1806-20
Creators: name: Mereghetti, S.
name: Gotz, D.
name: Mirabel, I. F.
name: Hurley, K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of persistent hard X-ray emission extending up to 150 keV from the soft gamma-ray repeater SGR 1806-20 using data obtained with the INTEGRAL satellite in 2003-2004. Previous observations of hard X-rays from objects of this class were limited to short duration bursts and rare transient episodes of strongly enhanced luminosity (``flares''). The emission observed with the IBIS instrument above 20 keV has a power law spectrum with photon index in the range 1.5-1.9 and a flux of 3 milliCrabs, corresponding to a 20-100 keV luminosity of ~10^36 erg s^-1 (for a distance of 15 kpc). The spectral hardness and the luminosity correlate with the level of source activity as measured from the number of emitted bursts.
description: 5 pages, 3 figures, Revised version accepted for publication in Astronomy and Astrophysics Letters
The Maize Green Revolution in Kenya Revisited
Creators: name: De Groote, Hugo
name: Owuor, George
name: Doss, Cheryl R.
name: Ouma, James Okuro
name: Muhammad, Lutta
name: Danda, Milton Kengo
name: De Groote, Hugo
name: Owuor, George
name: Doss, Cheryl R.
name: Ouma, James Okuro
name: Muhammad, Lutta
name: Danda, Milton Kengo
Publisher: name: Unknown
Year: 2005
Subjects: subject: Crop Production/Industries
subject: International Development
subject: green revolution
subject: maize
subject: adoption
subject: soil fertility
subject: Kenya

description: The maize green revolution, which increased maize yields through the use of improved varieties and fertilizer, has stalled since the mid-eighties in Kenya. This paper examines whether the stagnation of yields continued in the 1990s in spite of the implementation of the maize liberalization policies by the Kenya Government. Analysis of farm level surveys from 1992 and 2002 indicates slight increases in the use of improved maize varieties and fertilizer, but a substantial decrease in the intensity of fertilizer use. The econometric analysis suggests that the intensity of fertilizer use has a major effect on yield. The use of improved maize varieties, however, did not affect yield, suggesting that there are local varieties for some areas that do as well as improved varieties. Research is needed to develop improved varieties for some areas, and also needed for the development of alternative affordable soil fertility measures.
Noncommutativity in Maxwell-Chern-Simons-Matter Theory Simulates Pauli Magnetic Coupling
Creators: name: Ghosh, Subir
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study interactions between like charges in the noncommutative Maxwell-Chern-Simons electrodynamics {\it{minimally}} coupled to spinors or scalars. We demonstrate that the non-relativistic potential profiles, for only spatial noncommutativity, are nearly identical to the ones generated by a {\it{non-minimal}} Pauli magnetic coupling, originally introduced by Stern \cite{js}. Although the Pauli term has crucial roles in the context of physically relevant objects such as anyons and like-charge bound states (or "Cooper pairs"), its inception \cite{js} (see also \cite{others}) was ad-hoc and phenomenological in nature. On the other hand we recover similar results by extending the minimal model to the noncommutative plane, which has developed in to an important generalization to ordinary spacetime in recent years. No additional input is needed besides the noncommutativity parameter. We prove a novel result that for complex scalar matter sector, the bound states (or "Cooper pairs" can be generated {\it{only}} if the Maxwell-Chern-Simons-scalar theory is embedded in noncommutative spacetime. This is all the more interesting since the Chern-Simons term does not directly contribute a noncommutative correction term in the action.
description: Revised version, Title changed, No changes in maths. part and conclusions, To appear in Mod.Phys.Lett. A
The Green Revolution in Zimbabwe
Creators: name: Alumira, Jane
name: Rusike, Joseph
name: Alumira, Jane
name: Rusike, Joseph
Publisher: name: Unknown
Year: 2005
Subjects: subject: International Development
subject: Green Revolution
subject: maize
subject: semi-arid areas
subject: soil fertility management
subject: drought
subject: Zimbabwe

description: This paper presents a historical overview of plant breeding research, variety release and seed supply of staple food grains in Zimbabwe, and assesses the impacts of the new varieties on yields using national aggregate yield data. The paper also analyses farm-level factors determining farmers’ adoption decisions in the semi-arid areas, where the mini-green revolution lagged behind more favorable areas. The results indicate that the adoption of improved crop varieties will not lead to substantial yield gains unless improved soil management methods, such as application of manure and fertilizer, are also adopted..
title: Managing Public Land Outdoor Recreation for Improved Visitor Experience and Resource Protection: Comparing Direct and Indirect Visitor Use Management Tools
Creators: name: Wheeler, Iree
Publisher: name: Utah State University
Year: 2024

description: Public land managers incorporate a variety of tools to manage visitors to Parks and Protected Areas (PPAs). The intention of these management actions is to mitigate visitor impacts on natural resources, and facilitate high quality visitor experiences by minimizing depreciative behavior or spreading out visitation to reduce congestion. Approaches such as interpretation and educational information which indirectly influence visitor behavior by encouraging people to participate in minimum impact behavior or to visit during a different time, are referred to as indirect management actions. Other approaches use enforcement or regulations to mandate changes in behavior, or direct management actions. While these educational and enforcement tools are not binary nor mutually exclusive, rather existing on a spectrum, researchers and managers often compare the efficacy of direct versus indirect management tools. Additionally, for decades the appropriate situations and potential impacts on visitor experience of these management tools have been examined. This dissertation assesses visitor experiences with one indirect management action, and one direct management action in the Moab, Utah region. The experiences of managers with management actions that influence visitor behavior and experience is also explored. In the first paper of this dissertation, I use a survey of visitors to Arches National Park to assess visitor experiences with a direct management action and predict support for an entrance reservation at Arches National Park. In the second paper I also use a visitor survey to understand the effectiveness of an indirect management action, a visitor education program at popular trailheads around Moab, Utah, to reduce visitor behavior that negatively impacts the biophysical resources and experience of other visitors. In the third paper, I assess how public land managers tasked with managing outdoor recreation in the Moab region make decisions regarding when to use direct or indirect management actions. Specifically, I look at the region as a system and illustrate how actions taken by different agencies interact with each other.
The Adoption and Impact of Improved Maize and Land Management Technologies in Uganda
Creators: name: Sserunkuuma, Dick
name: Sserunkuuma, Dick
Publisher: name: Unknown
Year: 2005
Subjects: subject: Crop Production/Industries
subject: Land Economics/Use
subject: Production-enhancing technologies
subject: maize
subject: land management
subject: poverty reduction

description: In spite of the fact that the Ugandan National Agricultural Research System has developed and released several production-enhancing technologies over a century, yields of most major crops at the farm level have been low. Given that about 80 percent of Uganda’s labor force is employed in agriculture, the scope for sustainable poverty reduction in Uganda depends very much on improving agricultural productivity. It is in this context, this paper examines why there has been poor adoption of production-enhancing technologies in the production of maize, which is a major crop in Uganda and what the impacts of the exiting production environment are on factor payments. This study reveals that farmers do not pay proper attention to soil fertility management, which acts as a major constraint to increase yields. The analysis also indicates the need for vibrant rental market for land to provide access to landless tenants who are found to be the economically efficient.
The broad-band spectrum of the persistent emission from SGR1806-20
Creators: name: Molkov, S.
name: Hurley, K.
name: Sunyaev, R.
name: Shtykovsky, P.
name: Revnivtsev, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of an analysis of the quiescent X-ray emission from the Soft Gamma-Ray Repeater SGR1806-20, taken during an INTEGRAL ultra-deep survey of the Galactic Center region in autumn 2003. The total effective exposure time spent on the source by the IBIS telescope during these observations exceeded 1.5 million seconds. Combining the INTEGRAL results with results from the XMM-Newton observatory, we present the broad band (1-200 keV) spectrum of the quiescent emission from this source. This is the first spectrum of the persistent emission from an SGR in the broad energy range up to 200 keV. The luminosity of SGR1806-20 in this range was 3.6E36 ergs/s for an assumed distance of 15 kpc. We show that weak undetected bursts should not contribute significantly to the quiescent emission. The spectrum of the source is very hard and has a power law shape without any trace of a high energy cutoff up to \~160 keV. No strong cyclotron line was detected in the persistent spectrum in the previously reported 4-6 keV band. During our next observations in the autumn 2004 source went to active phase and its avereged flux between powerful bursts was 2-3 times higher than in 2003. During these observations two other SGR candidates, SGR1801-23 and SGR1808-20, were in the field of view. Neither persistent hard X-ray emission nor bursts were detected from them. The upper limit on the persistent flux from each of them in the energy band 18-100 keV is about 4E-11 erg/s/cm2.
description: 4 pages, 3 figures, submitted to Astron. Astrophysics Letters
The Vertex-Face Correspondence and the Elliptic 6j-symbols
Creators: name: Konno, Hitoshi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: A new formula connecting the elliptic $6j$-symbols and the fusion of the vertex-face intertwining vectors is given. This is based on the identification of the $k$ fusion intertwining vectors with the change of base matrix elements from Sklyanin's standard base to Rosengren's natural base in the space of even theta functions of order $2k$. The new formula allows us to derive various properties of the elliptic $6j$-symbols, such as the addition formula, the biorthogonality property, the fusion formula and the Yang-Baxter relation. We also discuss a connection with the Sklyanin algebra based on the factorised formula for the $L$-operator.
description: 23 pages
Manuscript New culture medium for micropropagation protocol of Psidium guajava.doc
Creators: name: Michail, Ioanna
name: Ganopoulos, Ioannis
name: Tzatzani, Thiresia-Tereza
name: SARROY, EIRINI
name: Boutsika, Anastasia
Publisher: name: figshare
Year: 2022
Subjects: subject: 70302 Agronomy
subject: FOS: Agriculture, forestry and fisheries
subject: 70601 Horticultural Crop Growth and Development
subject: 70602 Horticultural Crop Improvement (Selection and Breeding)
subject: 70507 Tree Improvement (Selection and Breeding)

description: Psidium guajava is a new crop cultivated in Greece, with a potential pharmaceutical and ornamental uses. An efficient and reliable protocol for in vitro clonal propagation of P. guajava from seeds was developed examining five different media. We believe that our study makes a significant contribution to the literature because our findings have potential implications for the propagation of this plant species.
Uptake of Improved Technologies in the Semi-arid Tropics of West Africa: Why is Agricultural Transformation Lagging Behind?
Creators: name: Ndjeunga, Jupiter
name: Bantilan, Ma Cynthia S.
name: Ndjeunga, Jupiter
name: Bantilan, Ma Cynthia S.
Publisher: name: Unknown
Year: 2005
Subjects: subject: International Development
subject: institutions
subject: technology
subject: markets
subject: road infrastructure
subject: information
subject: agricultural productivity

description: During the last 3 decades, donors and governments have invested in the development and dissemination of new technologies in the semi-arid tropics of West Africa. Though a wide range of improved technologies has been developed, adoption remains low without a significant impact on crop productivity, rural income and poverty. Agricultural transformation as occurred in East Asia has not yet occurred in the semi-arid tropics of West Africa. This paper uses data from a regional survey of rural households in 3 countries in West Africa (Burkina Faso, Mali, and Niger) to identify the determinants of uptake of improved technologies. Limited productivity gain is found to be a major constraint to the uptake of technologies. In addition, poorly functioning institutions, lack of information or poor exposure of farmers to agricultural innovations, and poor functioning or missing markets have also hindered the uptake of many new technologies.
Revealing an ocean edge
Creators: name: Dick, Beryl Allen
Publisher: name: University of British Columbia
Year: 2009

description: A design is developed for a community park on the ocean edge of West Vancouver, British Columbia. The guiding design goal is to achieve a sensitive response to the essence of this edge. The experience of this ocean, land and sky interface is explored as are its conditions of context and memory. Overarching design responses are presented and a conceptual design is articulated. The design of the park attempts to reveal the tactile nature of this ocean edge. The design is authentic to today yet the hope is that it will inspire experimentation and change with time. The park will have a quality of stable impermanence, like the edge where it is found.
Higgs boson decays into narrow di-photon jets and their search strategies at the Large Hadron Collider
Creators: name: Sheff, Benjamin
name: Steinberg, Noah
name: Wells, James D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In many extensions of the Standard Model the Higgs boson can decay into two light scalars each of which then subsequently decay into two photons. The underlying event is h $\to$ 4$γ$, but the kinematics from boosted light scalar decays combined with realistic detector resolutions may fail to register the events in straightforward categories and thus may be lost. In this article we investigate the phase space for highly boosted di-photon events from these exotic Higgs decays and discuss search strategies that aim to capture and label events in this difficult region. In the process we develop a new category, $ξ$-jets, which identifies with high selectivity highly collimated di-photon decay modes of the Higgs boson.
description: 18 pages, 6 figures
A 2004 Social Accounting Matrix for Israel: Documentation of an Economy-Wide Database with a Focus on Agriculture, the Labour Market, and Income Distribution
Creators: name: Siddig, Khalid H.A.
name: Flaig, Dorothee
name: Luckmann, Jonas
name: Grethe, Harald
name: Siddig, Khalid H.A.
name: Flaig, Dorothee
name: Luckmann, Jonas
name: Grethe, Harald
Publisher: name: Unknown
Year: 2011
Subjects: subject: Agricultural and Food Policy
subject: Consumer/Household Economics
subject: Labor and Human Capital
subject: SAM
subject: IO Table
subject: CGE
subject: Database
subject: Israel.

description: This document describes the Israeli Social Accounting Matrix (SAM) for the year 2004, developed by the Agricultural and Food Policy Group at the University of Hohenheim. The SAM is a part of a larger research project which aims to analyse several economic, trade, and labour policies in the context of economic integration of agriculture between Israel and the West Bank. Data are obtained from various sources in Israel. Sources include the Israeli Central Bureau of Statistics (ICBS), the Central Bank of Israel (CBI), and the Israeli Tax Authority (ITA). Data from sources outside of Israel are used to fill-in some gaps in the domestic reports. External sources include the World Trade Organization (WTO), the Organisation for Economic Co-operation and Development (OECD), and the World Bank. The SAM provides data on 47 sectors with activities separated from commodities, 36 labour force types, 10 household groups, as well as 17 tax accounts in addition to 37 accounts reserved for taxes on production factors. A topdown approach is pursued by first building a balanced macro SAM which is consistent with 2004 national account data. Subsequently, the macro SAM is disaggregated into a micro SAM which is balanced in several steps.
Severi dimensions for unicuspidal curves
Creators: name: Cotterill, Ethan
name: Lima, Vinícius Lara
name: Martins, Renato Vidal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 14H20, 14H45, 14H51, 20Mxx

description: We study parameter spaces of linear series on projective curves in the presence of unibranch singularities, i.e. {\it cusps}; and to do so, we stratify cusps according to value semigroup. We show that {\it generalized Severi varieties} of maps $\mathbb{P}^1 \rightarrow \mathbb{P}^n$ with images of fixed degree and arithmetic genus are often {\it reducible} whenever $n \geq 3$. We also prove that the Severi variety of degree-$d$ maps with a hyperelliptic cusp of delta-invariant $g \ll d$ is of codimension at least $(n-1)g$ inside the space of degree-$d$ holomorphic maps $\mathbb{P}^1 \rightarrow \mathbb{P}^n$; and that for small $g$, the bound is exact, and the corresponding space of maps is the disjoint union of unirational strata. Finally, we conjecture a generalization for unicuspidal rational curves associated to an {\it arbitrary} value semigroup.
description: Material related to gonality of unicuspidal curves was suppressed and will appear elsewhere; title was modified accordingly. To appear in J. Alg
Fusion of Baxter's Elliptic $R$-matrix and the Vertex-Face Correspondence
Creators: name: Konno, Hitoshi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The matrix elements of the $2\times 2$ fusion of Baxter's elliptic $R$-matrix, $R^{(2,2)}(u)$, are given explicitly. Based on a note by Jimbo, we give a formula which show that $R^{(2,2)}(u)$ is gauge equivalent to Fateev's $R$-matrix for the 21-vertex model. Then the crossing symmetry formula for $R^{(2,2)}(u)$ is derived. We also consider the fusion of the vertex-face correspondence relation and derive a crossing symmetry relation between the fusion of the intertwining vectors and their dual vectors.
description: To appear in the proceedings of the workshop ``Solvable Lattice Models 2004", July 20--23, 2004, RIMS Koukyuroku, Kyoto University