cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Transition to the Fulde-Ferrel-Larkin-Ovchinnikov planar phase : a quasiclassical investigation with Fourier expansion
Creators: name: Combescot, R.
name: Mora, C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We explore, in three spatial dimensions, the transition from the normal state to the Fulde-Ferrel-Larkin-Ovchinnikov superfluid phases. We restrict ourselves to the case of the 'planar' phase, where the order parameter depends only on a single spatial coordinate. We first show that, in the case of the simple Fulde-Ferrell phase, singularities occur at zero temperature in the free energy which prevents, at low temperature, a reliable use of an expansion in powers of the order parameter. We then introduce in the quasiclassical equations a Fourier expansion for the order parameter and the Green's functions, and we show that it converges quite rapidly to the exact solution. We finally implement numerically this method and find results in excellent agreement with the earlier work of Matsuo \emph{et al}. In particular when the temperature is lowered from the tricritical point, the transition switches from first to second order. In the case of the first order transition, the spatial dependence of the order parameter at the transition is found to be always very nearly a pure cosine, although the maximum of its modulus may be comparable to the one of the uniform BCS phase.
On the Distance of SGR 1935+2154 Associated with FRB 200428 and Hosted in SNR G57.2+0.8
Creators: name: Zhong, S. Q.
name: Dai, Z. G.
name: Zhang, H. M.
name: Deng, C. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Owing to the detection of an extremely bright fast radio burst (FRB) 200428 associated with a hard X-ray counterpart from the magnetar soft gamma-ray repeater (SGR) 1935+2154, the distance of SGR 1935+2154 potentially hosted in the supernova remnant (SNR) G57.2+0.8 can be revisited. Under the assumption that the SGR and the SNR are physically related, in this Letter, by investigating the dispersion measure (DM) of the FRB contributed by the foreground medium of our Galaxy and the local environments and combining with other observational constraints, we find that the distance of SGR 1935+2154 turns out to be $9.0\pm2.5\,$kpc and the SNR radius falls into $10$ to $18\,$pc since the local DM contribution is as low as $0-18\,$pc cm$^{-3}$. These results are basically consistent with the previous studies. In addition, an estimate for the Faraday rotation measure of the SGR and SNR is also carried out.
description: 7 pages, 3 figures (replotted), an uncertainty analysis of the distance estimate has been added, accepted for publication in ApJ Letters
Atomic Collapse in Disordered Graphene Quantum Dots
Creators: name: Polat, Mustafa
name: Güçlü, A. D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this paper, we numerically study a Coulomb impurity problem for interacting Dirac fermions restricted in disordered graphene quantum dots. In the presence of randomly distributed lattice defects and spatial potential fluctuations, the response of the critical coupling constant for atomic collapse is mainly investigated by local density of states calculations within the extended mean-field Hubbard model. We find that both types of disorder cause an amplification of the critical threshold. As a result, up to thirty-four percent increase in the critical coupling constant is reported. This numerical result may explain why the Coulomb impurities remain subcritical in experiments, even if they are supercritical in theory. Our results also point to the possibility that atomic collapse can be observed in defect-rich samples such as Ar$^{+}$ ion bombarded, He$^{+}$ ion irradiated, and hydrogenated graphene.
FERTILIZER MANAGEMENT EFFECTS ON FORAGE AND SEED YIELD OF TROPICAL GRASSES IN THE U.S VIRGIN ISLANDS
Creators: name: Valencia, E.
name: Adjei, M. B.
name: Rechcigl, J. E.
name: Valencia, E.
name: Adjei, M. B.
name: Rechcigl, J. E.
Publisher: name: Unknown
Year: 2002
Subjects: Crop Production/Industries

description: Guineagrass (Panicum maximum Jacq.), an important tropical forage in the eastern Caribbean Islands is established from seed. Low seed availability due to seed shattering losses and low germination percentages limits pasture development in the U.S. Virgin Islands. Recent introduction of Atra paspalum cv. Suerte (Paspalum atratum Swallen) exhibited potential as stand-over forage, but more information is needed on dry matter yield (DMY) and seed yield. A field experiment was conducted on a mildly alkaline Fredensborg clay (fine carbonatic, isohyperthermic, Typic Rendols, Mollisols) in 2000 to determine the effect of three N rates (0, 56, and 112 kg ha'1) on DMY and seed yield of guineagrass, Bluegrass, and Suerte. Ammonium sulfate as N source was broadcast applied on cut grass stands (15-cm stubble height) on 15th August 2000 and harvested in November 2000(12 wk). Guineagrass and Suerte differed in DMY (P<0.05). There was also an N linear (P<0.05) effect on DMY for guineagrass, but not for Suerte. Guineagrass DMY averaged 6.5, 8.3, and 9.4 Mg ha"1 for the 0, 56, and 112 kg ha"1 of N, respectively. Suerte averaged 2.56 Mg ha"1. Seed yield of guineagrass compared to Suerte was not different (P>0.05). Seed yield of guineagrass was 242 kg ha"1 and Suerte was 278 kg ha'. There was a trend for seed increase with increasing N rates for guineagrass (P=0.10) and a quadratic response (P<0.05) for Suerte. Results of the study indicate a strong response of guineagrass to N applications. During seed maturity, strong easterly winds may have affected yields of both grasses. Multiple harvests may be needed for these grasses to get a better estimate of seed yield and quality.
Time dependent CP asymmetry in $B^0 \to ρ^0 γ$ decay to probe the origin of CP violation
Creators: name: Kim, C. S.
name: Kim, Yeong Gyun
name: Lee, Kang Young
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Since the CP violation in the $B$ system has been investigated up to now only through processes related to the $B$--$\bar{B}$ mixing, urgently required is new way of study for the CP violation and establishing its origin in the $B$ system independent of the mixing process. In this work, we explore the exclusive $ B^0 \to ρ^0 γ$ decay to obtain the time-dependent CP asymmetry in $b \to d$ decay process in the standard model and the supersymmetric model. We find that the complex RL and RR mass insertion to the squark sector in the MSSM can lead to a large CP asymmetry in $b \to d γ$ decay through the gluino-squark diagrams, which is not predicted in the Standard Model induced by the $B$--$\bar{B}$ mixing.
description: 10 pages, 4 eps figures
Role of tatiana in Eugene Onegin by Tchaikovsky
Creators: name: Sellinger, Dionne Rachelle
Publisher: name: University of British Columbia
Year: 2010

description: The thesis for the Master of Music degree in Opera consists of the performance of a major role in one full opera production in the first or second year. My major role in one full opera production was performed in Eugene Onegin on March 6, 2005.
A High Galactic Latitude HI 21cm-line Absorption Survey using the GMRT: I. Observations and Spectra
Creators: name: Mohan, Rekhesh
name: Dwarakanath, K. S.
name: Srinivasan, G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used the Giant Meterwave Radio Telescope (GMRT) to measure the Galactic HI 21-cm line absorption towards 102 extragalactic radio continuum sources, located at high (|b| >15deg.) Galactic latitudes. The Declination coverage of the present survey is Decl. ~ -45deg.. With a mean rms optical depth of ~0.003, this is the most sensitive Galactic HI 21-cm line absorption survey to date. To supplement the absorption data, we have extracted the HI 21-cm line emission profiles towards these 102 lines of sight from the Leiden Dwingeloo Survey of Galactic neutral hydrogen. We have carried out a Gaussian fitting analysis to identify the discrete absorption and emission components in these profiles. In this paper, we present the spectra and the components. A subsequent paper will discuss the interpretation of these results.
description: 46 pages, Accepted for publication in Journal of Astrophysics & Astronomy
A MODEL FOR SUSTAINABLE GENETIC IMPROVEMENT OF BARBADOS BLACKBELLY SHEEP IN THE CARIBBEAN
Creators: name: Rastogi, R. K.
name: Rastogi, R. K.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Crop Production/Industries
subject: Production Economics
subject: Caribbean hair sheep
subject: Genetic improvement
subject: Within breed selection
subject: Major
subject: prolificacy gene

description: This paper points out that several breeds of prolific sheep in the world possess a major gene for prolificacy. However, the existence of such a major gene in the prolific breeds of hair sheep in the Caribbean remains to be researched. This paper assumes that this gene (F) exists in the Barbados Blackbelly sheep and goes on to outline a strategy to exploit it for the benefit of the small farmer as well as the large private producer. The strategy aims at developing one type of sheep for the small farmer by selective reduction in the frequency of the F gene thereby reducing the frequency of multiple births. The development of another type of highly prolific sheep is suggested for use by the large producer through selective increase in the frequency of the F gene. Large producer is expected to employ high levels of feeding and management including artificial rearing of lambs so as to minimize mortality of multiplets. The paper further discusses within breed selection for genetic improvement in general fitness of hair sheep. In this connection, the development of an open nucleus flock is suggested involving cooperation among participant smallholders.
Probing the size and charge of Polycyclic Aromatic Hydrocarbons
Creators: name: Maragkoudakis, A.
name: Peeters, E.
name: Ricca, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a new method to accurately describe the ionization fraction and the size distribution of polycyclic aromatic hydrocarbons (PAHs) within astrophysical sources. To this purpose, we have computed the mid-infrared emission spectra of 308 PAH molecules of varying sizes, symmetries, and compactness, generated in a range of radiation fields. We show that the intensity ratio of the solo CH out-of-plane bending mode in PAH cations and anions (referred to as the 11.0 $μ$m band, falling in the 11.0-11.3 $μ$m region for cations and anions) to their 3.3 $μ$m emission, scales with PAH size, similarly to the scaling of the 11.2/3.3 ratio with the number of carbon atoms (N$_{\mathrm{C}}$) for neutral molecules. Among the different PAH emission bands, it is the 3.3 $μ$m band intensity which has the strongest correlation with N$_{\mathrm{C}}$, and drives the reported PAH intensity ratio correlations with N$_{\mathrm{C}}$ for both neutral and ionized PAHs. The 6.2/7.7 intensity ratio, previously adopted to track PAH size, shows no evident scaling with N$_{\mathrm{C}}$ in our large sample. We define a new diagnostic grid space to probe PAH charge and size, using the (11.2+11.0)/7.7 and (11.2+11.0)/3.3 PAH intensity ratios respectively. We demonstrate the application of the (11.2+11.0)/7.7 - (11.2+11.0)/3.3 diagnostic grid for galaxies M82 and NGC 253, for the planetary nebula NGC 7027, and the reflection nebulae NGC 2023 and NGC 7023. Finally, we provide quantitative relations for PAH size determination depending on the ionization fraction of the PAHs and the radiation field they are exposed to.
description: 25 pages, 16 figures, 16 tables. Accepted for publication in MNRAS
Higher degree Galois covers of CP^1 x T
Creators: name: Amram, Meirav
name: Goldberg, David
Publisher: name: arXiv
Year: 2004
Subjects: subject: Algebraic Geometry (math.AG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 14Q10, 14J80, 32Q55

description: Let T be a complex torus, and X the surface CP^1 x T. If T is embedded in CP^{n-1} then X may be embedded in CP^{2n-1}. Let X_Gal be its Galois cover with respect to a generic projection to CP^2. In this paper we compute the fundamental group of X_Gal, using the degeneration and regeneration techniques, the Moishezon-Teicher braid monodromy algorithm and group calculations. We show that pi_1(X_Gal) = Z^{4n-2}.
description: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol4/agt-4-37.abs.html
A High Galactic Latitude HI 21cm-line Absorption Survey using the GMRT: II. Results and Interpretation
Creators: name: Mohan, Rekhesh
name: Dwarakanath, K. S.
name: Srinivasan, G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have carried out a sensitive high-latitude (|b| > 15deg.) HI 21cm-line absorption survey towards 102 sources using the GMRT. With a 3-sigma detection limit in optical depth of ~0.01, this is the most sensitive HI absorption survey. We detected 126 absorption features most of which also have corresponding HI emission features in the Leiden Dwingeloo Survey of Galactic neutral Hydrogen. The histogram of random velocities of the absorption features is well-fit by two Gaussians centered at V(lsr) ~ 0 km/s with velocity dispersions of 7.6 +/- 0.3 km/s and 21 +/- 4 km/s respectively. About 20% of the HI absorption features form the larger velocity dispersion component. The HI absorption features forming the narrow Gaussian have a mean optical depth of 0.20 +/- 0.19, a mean HI column density of (1.46 +/- 1.03) X 10^{20} cm^{-2}, and a mean spin temperature of 121 +/- 69 K. These HI concentrations can be identified with the standard HI clouds in the cold neutral medium of the Galaxy. The HI absorption features forming the wider Gaussian have a mean optical depth of 0.04 +/- 0.02, a mean HI column density of (4.3 +/- 3.4) X 10^{19} cm^{-2}, and a mean spin temperature of 125 +/- 82 K. The HI column densities of these fast clouds decrease with their increasing random velocities. These fast clouds can be identified with a population of clouds detected so far only in optical absorption and in HI emission lines with a similar velocity dispersion. This population of fast clouds is likely to be in the lower Galactic Halo.
description: 19 pages, 19 figures. Accepted for publication in Journal of Astrophysics & Astronomy
Additional file 1 of Actigraphy in brain-injured patients – A valid measurement for assessing circadian rhythms?
Creators: name: Angerer, Monika
name: Schabus, Manuel
name: Raml, Marion
name: Pichler, Gerald
name: Kunz, Alexander B.
name: Scarpatetti, Monika
name: Trinka, Eugen
name: Blume, Christine
Publisher: name: figshare
Year: 2020
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Plant Biology

description: Additional file 1: Additional information on light levels, multiple CRS-R assessments [29] and monitoring of passive movements. Figure S1. Graphical user interface of the tablet in the patient room. Table S1. Circadian rhythm indices from the uncorrected actigraphy data. Table S2. Circadian rhythm indices from the corrected actigraphy data. Figure S2. Periodogram of the uncorrected (A) and corrected (B) actigraphy data from patient 26. Figure S3. Normalized power of the patients’ peaks closest to 24 h in uncorrected vs. corrected data. Figure S4. Interdaily stability (A + B), intradaily variability (C + D) and circadian rhythmicity (E + F) in MCS/EMCS vs. UWS patients separately for uncorrected and corrected data. Figure S5. Interdaily stability (A), intradaily variability (B), circadian rhythmicity (C) and circadian rhythm strength (D) in TBI vs. NTBI patients in the corrected data. Figure S6. Patients’ mean activity during day (7 am – 9 pm) vs. night (9 pm – 7 am) separately for uncorrected and corrected data. Figure S7. Mean activity levels during day (7 am – 9 pm) and night (9 pm – 7 am) in MCS/EMCS vs. UWS patients separately for uncorrected and corrected data. Figure S8. Mean activity levels during day (7 am – 9 pm) and night (9 pm – 7 am) in TBI vs. NTBI patients in the corrected data. Figure S9. Correlation Matrix.
Volume dependences from lattice chiral perturbation theory
Creators: name: Borasoy, B.
name: Lewis, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The physics of pions within a finite volume is explored using lattice regularized chiral perturbation theory. This regularization scheme permits a straightforward computational approach to be used in place of analytical continuum techniques. Using the pion mass, decay constant, form factor and charge radius as examples, it is shown how numerical results for volume dependences are obtained at the one-loop level from simple summations.
description: 19 pages, 7 figures
Lead abundance in the uranium star CS 31082-001
Creators: name: Plez, B.
name: Hill, V.
name: Cayrel, R.
name: Spite, M.
name: Barbuy, B.
name: Beers, T. C.
name: Bonifacio, P.
name: Primas, F.
name: Nordström, B.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In a previous paper we were able to measure the abundance of uranium and thorium in the very-metal poor halo giant BPS CS 31082-001, but only obtained an upper limit for the abundance of lead (Pb). We have got from ESO 17 hours of additional exposure on this star in order to secure a detection of the minimum amount of lead expected to be present in CS 31082-001, the amount arising from the decay of the original content of Th and U in the star. We report here this successful detection. We find an LTE abundance log(Pb/H)+12=-0.55 \pm 0.15 dex, one dex below the upper limits given by other authors for the similar stars CS 22892-052 and BD +17d3248, also enhanced in r-process elements. From the observed present abundances of Th and U in the star, the expected amount of Pb produced by the decay of 232Th, and 238U alone, over 12-15 Gyr is -0.73\pm 0.17 dex. The decay of 235U is more difficult to estimate, but is probably slightly below the contribution of 238U, making the contribution of the 3 actinides only slightly below, or even equal to, the measured abundance. The contribution from the decay of 234U has was not included, for lack of published data. In this sense our determination is a lower limit to the contribution of actinides to lead production. We comment this result, and we note that if a NLTE analysis, not yet possible, doubles our observed abundance, the decay of the 3 actinides will still represent 50 per cent of the total lead, a proportion higher than the values considered so far in the literature.
description: 4 pages, LateX, A&A Letters Accepted
Dynamics and bifurcations in multistable 3-cell neural networks
Creators: name: Collens, J.
name: Pusuluri, K.
name: Kelly, A.
name: Knapper, D.
name: Xing, T.
name: Basodi, S.
name: Alacam, D.
name: Shilnikov, A. L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We disclose the generality of the intrinsic mechanisms underlying multistability in reciprocally inhibitory 3-cell circuits composed of simplified, low-dimensional models of oscillatory neurons, as opposed to those of a detailed Hodgkin- Huxley type . The computational reduction to return maps for the phase-lags between neurons reveals a rich multiplicity of rhythmic patterns in such circuits. We perform a detailed bifurcation analysis to show how such rhythms can emerge, disappear, and gain or lose stability, as the parameters of the individual cells and the synapses are varied.
Additional file 1 of Effects of cadmium perturbation on the microbial community structure and heavy metal resistome of a tropical agricultural soil
Creators: name: Salam, Lateef B.
name: Oluwafemi S. Obayori
name: Ilori, Mathew O.
name: Olukayode O. Amund
Publisher: name: figshare
Year: 2020
Subjects: subject: Microbiology
subject: FOS: Biological sciences

description: Additional file 1. Additional figures.
Sharing without Showing: Secure Cloud Analytics with Trusted Execution Environments
Creators: name: Birgersson, Marcus
name: Artho, Cyrille
name: Balliu, Musard
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Many applications benefit from computations over the data of multiple users while preserving confidentiality. We present a solution where multiple mutually distrusting users' data can be aggregated with an acceptable overhead, while allowing users to be added to the system at any time without re-encrypting data. Our solution to this problem is to use a Trusted Execution Environment (Intel SGX) for the computation, while the confidential data is encrypted with the data owner's key and can be stored anywhere, without trust in the service provider. We do not require the user to be online during the computation phase and do not require a trusted party to store data in plain text. Still, the computation can only be carried out if the data owner explicitly has given permission. Experiments using common functions such as the sum, least square fit, histogram, and SVM classification, exhibit an average overhead of $1.6 \times$. In addition to these performance experiments, we present a use case for computing the distributions of taxis in a city without revealing the position of any other taxi to the other parties.
Stated or inferred attribute non-attendance? A simulation approach
Creators: name: Mariel, Petr
name: Hoyos, D.
name: Meyerhoff, J.
name: Mariel, Petr
name: Hoyos, D.
name: Meyerhoff, J.
Publisher: name: Unknown
Year: 2013
Subjects: subject: Environmental Economics and Policy
subject: Research Methods/ Statistical Methods
subject: Attribute non-attendance
subject: choice modelling
subject: environmental valuation
subject: random parameter logit

description: In the last few years, there has been a growing body of literature on how to detect and deal with the fact that some respondents seem to ignore one or more attributes in a discrete choice experiments. This paper aims to analyse the performance of two econometric approaches devoted to solve this problem: the stated attribute non-attendance approach and the inferred attribute non-attendance approach. These approaches are examined further by two common ways of collecting information on attribute non-attendance: serial and choice task non-attendance. The results of the simulation experiments show firstly, that choice task non-attendance of one attribute causes biases in the estimation of all other parameters; and, secondly, that only serial non-attendance can be inferred successfully. The results are policy relevant because not treating, or treating this issue incorrectly may end up in biased welfare measures.
MLSolv-A: A Novel Machine Learning-Based Prediction of Solvation Free Energies from Pairwise Atomistic Interactions
Creators: name: Lim, Hyuntae
name: Jung, YounJoon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (stat.ML)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Machine Learning (cs.LG)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Recent advances in machine learning and their applications have lead to the development of diverse structure-property relationship models for crucial chemical properties, and the solvation free energy is one of them. Here, we introduce a novel ML-based solvation model, which calculates the solvation energy from pairwise atomistic interactions. The novelty of the proposed model consists of a simple architecture: two encoding functions extract atomic feature vectors from the given chemical structure, while the inner product between two atomistic features calculates their interactions. The results on 6,493 experimental measurements achieve outstanding performance and transferability for enlarging training data due to its solvent-non-specific nature. Analysis of the interaction map shows there is a great potential that our model reproduces group contributions on the solvation energy, which makes us believe that the model not only provides the predicted target property but also gives us more detailed physicochemical insights.
description: 20 pages, 5 figures
Municipal solid waste generation in mature destinations: An IPAT-type model for Mallorca
Creators: name: Arbulú, I.
name: Lozano, J.
name: Rey-Maquieira, J.
name: Arbulú, I.
name: Lozano, J.
name: Rey-Maquieira, J.
Publisher: name: Unknown
Year: 2013
Subjects: subject: Community/Rural/Urban Development
subject: Environmental Economics and Policy
subject: IPAT Model
subject: municipal solid waste
subject: tourism growth

description: Several studies examined the relationship between environmental degradation and population growth. However, most of them don’t take into account the difference between local population and tourist arrivals. This paper contributes to the literature by separating these two groups within the framework of IPAT-based models to measure the impact of tourist arrivals in terms of municipal solid waste generation for Mallorca. The model leads to a stochastic differential equations system, which showed that this mature tourist destinations have higher population elasticity than industrial economies. Moreover, the model allowed us to measure the elasticity of substitution between lower-income and higher-income tourists.
Geodesic behavior of sudden future singularities
Creators: name: Fernández-Jambrina, L.
name: Lazkoz, Ruth
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we analyze the effect of recently proposed classes of sudden future singularities on causal geodesics of FLRW spacetimes. Geodesics are shown to be extendible and just the equations for geodesic deviation are singular, although tidal forces are not strong enough to produce a Big Rip. For the sake of completeness, we compare with the typical sudden future singularities of phantom cosmologies.
description: 3 pages, revtex, twocolumn
Análisis de los recursos hídricos de Riegos del Alto Aragón (Huesca) en la primera década del siglo XXI
Creators: name: Sánchez-Chóliz, J.
name: Sarasa, C.
name: Sánchez-Chóliz, J.
name: Sarasa, C.
Publisher: name: Unknown
Year: 2013
Subjects: subject: Crop Production/Industries
subject: Resource /Energy Economics and Policy
subject: Demandas y suministros de agua
subject: eficiencia del regadío
subject: escasez de agua
subject: patrones de cultivo.

description: Este trabajo profundiza en la evolución de la situación hídrica de la Comunidad General de Riegos del Alto Aragón (127.210 ha), localizada en el noreste español. Se analiza para el conjunto de esta zona regable y para cada una de sus 58 comunidades de regantes la evolución de las demandas de agua, los niveles de eficiencia, los patrones de cultivos y su rentabilidad económica. Las cifras obtenidas de los niveles de eficiencia son muy significativas y de aplicación inmediata para la mejora de la política de gestión del agua. Los resultados muestran por una parte la necesidad de detener la actual expansión del regadío en esta comunidad, y por otra que la falta de agua está provocando cambios en los patrones de cultivo hacia cultivos menos exigentes de agua y con menor rentabilidad económica, en lugar de lo esperado (más frutales, hortalizas, maíz,…).
Frequency Selective Wave Beaming in Nonreciprocal Acoustic Phased Arrays
Creators: name: Adlakha, R.
name: Moghaddaszadeh, M.
name: Attarzadeh, M. A.
name: Aref, A.
name: Nouh, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Acoustic phased arrays are capable of steering and focusing a beam of sound via selective coordination of the spatial distribution of phase angles between multiple sound emitters. Constrained by the principle of reciprocity, conventional phased arrays exhibit identical transmission and reception patterns which limit the scope of their operation. This work presents a controllable space-time acoustic phased array which breaks time-reversal symmetry, and enables phononic transition in both momentum and energy spaces. By leveraging a dynamic phase modulation, the proposed linear phased array is no longer bound by the acoustic reciprocity, and supports asymmetric transmission and reception patterns that can be tuned independently at multiple channels. A foundational framework is developed to characterize and interpret the emergent nonreciprocal phenomena and is later validated against benchmark numerical experiments. The new phased array selectively alters the directional and frequency content of the incident signal and the frequency conversion between the different wave fields is analyzed as a function of the imposed modulation. The space-time acoustic phased array enables unprecedented control over sound waves in a variety of applications ranging from ultrasonic imaging to non-destructive testing and underwater SONAR telecommunication.
Inflation: Where Do We Stand?
Creators: name: Martin, Jerome
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this short review, the predictions of inflation are presented and compared to the most recent measurements of the Cosmic Microwave Background (CMB) anisotropy. It is argued that inflation is compatible with these observations but that these ones are not yet accurate enough to probe the details of the scenario.
description: 7 pages, no figure, Proceedings of the 8th Workshop on Non-Perturbative Quantum Chromodynamics, June 7-11, 2004, Paris
Negotiating in Disequilibrium: Can a Trans-Pacific Partnership be Achieved as Potential Partners Proliferate?
Creators: name: Kerr, William A.
name: Kerr, William A.
Publisher: name: Unknown
Year: 2013
Subjects: subject: Demand and Price Analysis
subject: Financial Economics
subject: Industrial Organization
subject: Institutional and Behavioral Economics
subject: International Development
subject: International Relations/Trade
subject: Political Economy
subject: agenda
subject: membership
subject: motives
subject: Trans-Pacific
subject: trade negotiations

description: The Trans-Pacific Partnership (TPP) is being negotiated in a radically different way than is normally the case with trade agreements. Trade negotiations usually take place among a set number of interested countries and within a pre-agreed agenda. In the case of the TPP the number of countries in the negotiations continues to expand, and each new country brings additional issues and concerns to the table. Can such an unorthodox approach succeed? The history and the dynamics of the TPP are examined to gain insights into the process, the motivations of the countries involved and the likeliness of a successful agreement being achieved.
Better nutrition for children in Uganda: The policy makers role
Creators: name: Ibrahim, Kasirye
name: Ibrahim, Kasirye
Publisher: name: Unknown
Year: 2012
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Consumer/Household Economics
subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: Health Economics and Policy
subject: Malnutrition
subject: Stanted children
subject: EPRC

description: About 2.3 million children under the age of five are too short for their age An estimated 250,000 children under the age of five suffer from severe acute malnutrition About half a million pregnant and lactating women suffer from anaemia
Scaling for Interfacial Tensions near Critical Endpoints
Creators: name: Zinn, Shun-yong
name: Fisher, Michael E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Parametric scaling representations are obtained and studied for the asymptotic behavior of interfacial tensions in the \textit{full} neighborhood of a fluid (or Ising-type) critical endpoint, i.e., as a function \textit{both} of temperature \textit{and} of density/order parameter \textit{or} chemical potential/ordering field. Accurate \textit{nonclassical critical exponents} and reliable estimates for the \textit{universal amplitude ratios} are included naturally on the basis of the ``extended de Gennes-Fisher'' local-functional theory. Serious defects in previous scaling treatments are rectified and complete wetting behavior is represented; however, quantitatively small, but unphysical residual nonanalyticities on the wetting side of the critical isotherm are smoothed out ``manually.'' Comparisons with the limited available observations are presented elsewhere but the theory invites new, searching experiments and simulations, e.g., for the vapor-liquid interfacial tension on the two sides of the critical endpoint isotherm for which an amplitude ratio $-3.25 \pm 0.05$ is predicted.
description: 42 pages, 6 figures, to appear in Physical Review E
Factorized Graph Representations for Semi-Supervised Learning from Sparse Data
Creators: name: P., Krishna Kumar
name: Langton, Paul
name: Gatterbauer, Wolfgang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Databases (cs.DB)
subject: Social and Information Networks (cs.SI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Node classification is an important problem in graph data management. It is commonly solved by various label propagation methods that work iteratively starting from a few labeled seed nodes. For graphs with arbitrary compatibilities between classes, these methods crucially depend on knowing the compatibility matrix that must be provided by either domain experts or heuristics. Can we instead directly estimate the correct compatibilities from a sparsely labeled graph in a principled and scalable way? We answer this question affirmatively and suggest a method called distant compatibility estimation that works even on extremely sparsely labeled graphs (e.g., 1 in 10,000 nodes is labeled) in a fraction of the time it later takes to label the remaining nodes. Our approach first creates multiple factorized graph representations (with size independent of the graph) and then performs estimation on these smaller graph sketches. We define algebraic amplification as the more general idea of leveraging algebraic properties of an algorithm's update equations to amplify sparse signals. We show that our estimator is by orders of magnitude faster than an alternative approach and that the end-to-end classification accuracy is comparable to using gold standard compatibilities. This makes it a cheap preprocessing step for any existing label propagation method and removes the current dependence on heuristics.
description: SIGMOD 2020 (Extended version)
Strategic & organizational problems of "LEADER" approach application as a tool for sustainable rural development in Bulgaria
Creators: name: Naydenov, Nikolay
name: Bogdanova, Zornitsa
name: Naydenov, Nikolay
name: Bogdanova, Zornitsa
Publisher: name: Unknown
Year: 2007
Subjects: subject: Community/Rural/Urban Development
subject: Labor and Human Capital
subject: Public Economics
subject: rural areas
subject: sustainable development
subject: "Leader" approach
subject: Local initiative groups survey

description: "Leader" approach is the main tool of the policy of sustainable rural development. However a number of strategic and organizational problems and also certain rules for its application in the praxis need to be formulated for its effective realization in Bulgaria. The strategic frameworkfor rural areas develop¬ment of the Ruse District and the opportunities for applying the Leader approach and creation of LAGs as a tool for assuring sustainable development are pre¬sented in the article. An analysis has been made about the problems for the "Leader" approach application in Bulgaria. The basis for the analysis are the main results from the realization of the pilot project "Sustainable Rural Develop¬ment" managed by the Ministry of agriculture andforestry and UNDP, as well as good practices and problems identified. An investigation of the establishment pro¬cess and also surveying offunctional problems of LAGs in Bulgaria is made in the article. Results of a special designed questionnaire have been analysed and dis¬cussed in the paper. On that basis appropriate conclusions and reccommendations are developed and presented in the paper, which might be used in the process of establishing of LAGs in Ruse district and also in other regions in Bulgaria.
Supplementary Table 2: Impact of excess activin A on the lipids, metabolites, and steroids of adult mousereproductive organs
Creators: name: Hutchison, Jennifer
Publisher: name: The University of Melbourne
Year: 2025
Subjects: classificationCode: 310903
subject: Animal developmental and reproductive biology

description: Table S2: Differentially abundant lipids of the InhaKO testis. Lipids identified to be significantly higher or lower in relative abundance in the InhaKO testes vs WT. Fold change > 1.5, P < 0.05.
Theory of the singlet exciton yield in light-emitting polymers
Creators: name: Barford, William
Publisher: name: arXiv
Year: 2004
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: This paper presents a possible explanation for the enhanced singlet exciton yield in light emitting polymers. We propose a theory of electron-hole recombination via inter-molecular inter-conversion from inter-molecular weakly bound polaron pairs (or charge-transfer excitons) to intra-molecular excitons. This theory is applicable to parallel polymer chains. A crucial aspect of the theory is that both the intra-molecular and inter-molecular excitons are effective-particles, which are described by both a relative-particle wavefunction and a center-of-mass wavefunction. This implies two electronic selection rules. (1) The parity of the relative-particle wavefunction implies that inter-conversion occurs from the even parity inter-molecular charge-transfer excitons to the strongly bound intra-molecular excitons. (2) The orthonormality of the center-of-mass wavefunctions ensures that inter-conversion occurs from the charge-transfer excitons to the lowest branch of the strongly bound exciton families, and not to higher lying members of these families. The inter-conversion is then predominately a multi-phonon process, determined by the Franck-Condon factors. These factors are exponentially smaller for the triplet manifold than the singlet manifold because of the large exchange energy.
description: To appear in Physical Review B, vol 70, 15 Oct 2004
Partition complexes, duality and integral tree representations
Creators: name: Robinson, Alan
Publisher: name: arXiv
Year: 2004
Subjects: subject: Category Theory (math.CT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 05E25, 17B60, 55P91

description: We show that the poset of non-trivial partitions of 1,2,...,n has a fundamental homology class with coefficients in a Lie superalgebra. Homological duality then rapidly yields a range of known results concerning the integral representations of the symmetric groups S_n and S_{n+1} on the homology and cohomology of this partially-ordered set.
description: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol4/agt-4-41.abs.html
Resilience from the perspective of the illicit injection drug user : an exploratory descriptive study
Creators: name: Shaw, Audrey Linda
Publisher: name: University of British Columbia
Year: 2010

description: Illicit injection drug use is a daunting health and social problem that calls for a multifaceted response. Resilience based strategies have the potential to complement the current approach to this problem but there is a paucity of research that would enable scientifically based strategies to be developed. The purpose of this secondary study was to explore and describe resilience from the perspective of individuals who use illicit injection drugs. For the purposes of this research increased resilience was viewed as quitting, decreasing and safer drug use and support seeking whereas decreased resilience was viewed as initial, increased or unsafe drug use and relapse. This qualitative study used data obtained from a larger qualitative study, conducted in Victoria, British Columbia in 2000, whose purpose was to determine behaviours and contexts that place the IDU at risk. Using Rapid Assessment Response and Evaluation methodology, data were collected from three participant groups: IDU (20 female, 21 male) service providers (45) and community leaders/policy makers (12). This study is limited to the key informant interview and focus group data of the first two groups. Participants described two types of experiences that were associated with an increase in resilience and one type of experience that was associated with a decrease in resilience. One type of experience associated with increased resilience involved getting to the point of behavioural and attitudinal change either by recognizing drug use was not worth the negative consequences entailed, by getting scared of the effects of drug use, by recognizing an inner desire to quit or by reaching out for support. A second type of experience associated with increased resilience involved envisioning a better non-drug using future. Participants also described experiences, associated with a decrease in resilience, which involved using illicit drugs to dull emotional pain stemming from abuse, mental illness, alienation, marginalization and hopelessness. Future research using primary data is suggested to increase knowledge of resilience in the context of those who use illicit injection drugs and to evaluate intervention strategies that include the fostering of protective factors in order to strengthen resilience.
Effects of electron-phonon interaction on non-equilibrium transport through single-molecule transistor
Creators: name: Chen, Zuo-Zi
name: Lü, Rong
name: Zhu, Bang-fen
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: On the basis of the nonequilibrium Green's function and nonperturbative canonical transformation for the local electron-phonon interaction (EPI), the quantum transport through a single-molecule transistor(SMT) has been investigated with a particular attention paid to the joint effect of the EPI and SMT-lead coupling on the spectral function and conductance. In addition to the usual EPI-induced renormalized effects (such as the red-shift, sharpening, and phonon-sidebands of the SMT level), owing to improved disentagling the electron-phonon system, it has been found that, the profile of the spectral function of the SMT electron is sensitive to lead chemical potentials, thus can readily be manipulated by tuning the bias as well as the SMT-gate voltage. As a consequence, the broken particle-hole symmetry in this system can be clearly recognized through the phonon sidebands in the spectral function. These EPI effects also manifest themselves in the nonequilibrium transport properties of the SMT, particularly at low temperature.
description: 9 pages, 7 figures, final version accepted by PRB
Resonant dipolar collisions of ultracold molecules induced by microwave dressing
Creators: name: Yan, Zoe Z.
name: Park, Jee Woo
name: Ni, Yiqi
name: Loh, Huanqian
name: Will, Sebastian
name: Karman, Tijs
name: Zwierlein, Martin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate microwave dressing on ultracold, fermionic ${}^{23}$Na${}^{40}$K ground-state molecules and observe resonant dipolar collisions with cross sections exceeding three times the $s$-wave unitarity limit. The origin of these collisions is the resonant alignment of the approaching molecules' dipoles along the intermolecular axis, which leads to strong attraction. We explain our observations with a conceptually simple two-state picture based on the Condon approximation. Furthermore, we perform coupled-channels calculations that agree well with the experimentally observed collision rates. While collisions are observed here as laser-induced loss, microwave dressing on chemically stable molecules trapped in box potentials may enable the creation of strongly interacting dipolar gases of molecules.
description: 6 pages, 4 figures
Supply Chain Networks: European Influence on the Russian Agri-food Business?
Creators: name: Belaya, Vera
name: Gagalyuk, Taras
name: Hanf, Jon
name: Belaya, Vera
name: Gagalyuk, Taras
name: Hanf, Jon
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Supply Chain Networks
subject: Agri-food Business
subject: Retail Internationalization
subject: Russia

description: In the context of retail internationalization it is observable that retailers from West European countries take their business models known from their home countries into the newly entered markets. In this sense there are at least three development trends in conjunction with globalization, which include global sourcing, retail branding and establishing of strictly coordinated vertical linkages (supply chain networks or netchains). In our paper we firstly describe the internationalization process of the retail business, and based on this, elaborate on structural changes resulting from and connected with internationalization process that are in the center of interest to the food industry. Further on, we focus on the situation in the agri-food business of Russia and describe whether the main tendencies of European retail development and the consequences of their influence are found there, as well as discuss outlook of future development of the Russian agri-food business in the context of supply chain management.