cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Estrategias para la gestion de riesgos y crisis en la agricultura espanola
Creators: name: Colmenero, Alberto
name: Azcarate, Isabel Bardaji
name: Colmenero, Alberto
name: Azcarate, Isabel Bardaji
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Risk and Uncertainty
subject: riesgos agrarios
subject: politicas
subject: seguros agrarios
subject: Espana
subject: Agricultural risks
subject: policies
subject: agricultural insurance
subject: Spain

description: Este articulo aborda las politicas de gestion de riesgos seguidas en Espana asi como sus persepctivas y posibilidades de mejora. Comienza con un examen de los riesgos a los que se enfrenta la agricultura espanola, partiendo para ello de la percepcion que de ellos tienen los productores y del analisis de la siniestralidad, tanto sobre de los seguros agrarios y de los pagos realizados por el estado ante adversidades climaticas no cubiertas por el seguro. Tras sintetizar el marco regulatorio de la UE y de la OMC de las ayudas nacionales para gestion de riesgos, se revisan las politicas de gestion de riesgos de Espana, incluyendo el seguro agrario y las medidas contempladas en la regulacion de mercados de la PAC. El articulo concluye con algunas refleciones sobre el futuro de las politicas de gestion de riesgos en Espana...This article analyzes the risk management policies applied in Spain, including their perspectives and improvement possibilities. It starts be reviewing the risks that affect Spanish agriculture, examining the farmer's risk perceptions and the main sources of crop failure and animal accidents, both based on the indemnities paid by the insurance system and on the ad-hoc payments for uninsurable risks and hazards. The paper then summarizes the regulatory framework of the EU and the WTO regarding the national support of risk management programs, and goes on to revise the Spanish ones, including agricultural insurance programs and the measures foreseen in the market regulation policies of the CAP. The articles finishes with a few reflections about the future risk management policies in Spain.
Prediction of noise levels and annoyance from aircraft run-ups at the Vancouver International Airport
Creators: name: Scherebnyj, Katrina Anna
Publisher: name: University of British Columbia
Year: 2010

description: The Vancouver International Airport Authority (YVRAA), responsible for managing the airport, has been receiving an ever-increasing number of noise complaints resulting from engine run-ups. Engine run-ups - the testing of stationary aircraft’s engines following maintenance - often take place at night in order to promptly return aircraft into service the following morning, thus causing noise disturbance in nearby communities. There are certain run-up parameters - such as the location and heading of the aircraft - which the airport can control. A model to predict noise levels, from which annoyance can be inferred and which YVRAA can use to manage run-ups, has been developed. A basic 2D, single-frequency version of the Green’s Function Parabolic Equation (GFPE) model for predicting outdoor noise levels was modified to include spatially-varying types of ground, turbulence, and air absorption. Sound-speed profiles resulting from wind and temperature gradients were also added, and the model was extended to predict 1/3-octave-band levels. The sound pressure levels and directivities of a small jet aircraft, the CRJ200, were measured in order to characterize its noise radiation. These and other data were used as the model input source data. The model modifications were evaluated by comparison with literature; predictions agreed well, typically within a couple of dB. The GFPE model was then used to calculate the transmission loss from run-up pads to community receiver locations, and corresponding annoyance levels, for various atmospheric conditions. A sensitivity analysis found the GFPE model to be most sensitive to wind, the state of the atmosphere, and the aircraft power setting and heading. Predictions for 17 run-ups were made; results were within 10 dBA in cases for which all input information was available, and within 20 dBA when some input data was unavailable. The percentage of people annoyed, as indicated by the percentage of people awoken from sleep, was predicted from the noise level predictions to be between 1.8 and 9.5 %.
A127
Creators: name: Khanzadeh, Hamed
Publisher: name: figshare
Year: 2021
Subjects: subject: 150603 Tourism Management
subject: FOS: Economics and business

description: The growing e-commerce development in different regions of the world and of course in Iran raises the question of how to make such a space in tourism as well. On the other hand, the role of social networks in the communications of individuals is increasing every day, and social networks provide the opportunity for dialogue among people around the world. This article, while taking a glance at the history of Web 2.0 as a platform for social networks, addresses the classification of these networks, such as language learning networks, location-based networks, photo sharing networks, video sharing networks and browser networks. It also describes the role of each one in tourism development, with pointing to case studies. In the final part, there are plans to use social networks for developing Iran tourism.
Can a circulating light beam produce a time machine?
Creators: name: Olum, Ken D.
name: Everett, Allen
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In a recent paper, Mallett found a solution of the Einstein equations in which closed timelike curves (CTC's) are present in the empty space outside an infinitely long cylinder of light moving in circular paths around an axis. Here we show that, for physically realistic energy densities, the CTC's occur at distances from the axis greater than the radius of the visible universe by an immense factor. We then show that Mallett's solution has a curvature singularity on the axis, even in the case where the intensity of the light vanishes. Thus it is not the solution one would get by starting with Minkowski space and establishing a cylinder of light.
description: 5 pages, RevTeX
THE IMPACT OF THE RECENT FEDERAL RESERVE LARGE-SCALE ASSET PURCHASES ON THE AGRICULTURAL COMMODITY PRICES: A HISTORICAL DECOMPOSITION
Creators: name: Saghaian, Sayed H.
name: Reed, Michael R.
name: Saghaian, Sayed H.
name: Reed, Michael R.
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Agricultural commodities
subject: quantitative easing
subject: monetary policy
subject: great recession
subject: historical decomposition

description: In this study, we evaluate the effects of the recent Federal Reserve’s purchases of long-term assets on prices of agricultural commodities. The first large-scale asset purchases began at the end of 2008, after the Great Recession, and the second purchases began in November of 2010. The commodities included in this analysis are meats (beef, pork, and broilers), cereal grains (corn, soybeans, wheat, and rice), and softs (sugar, coffee, cocoa, and cotton). Using historical decompositions, we find significant increases in the nominal agricultural prices of ten out of 12 agricultural commodities under investigation from the second large-scale asset
Renormalization-group and numerical analysis of a noisy Kuramoto-Sivashinsky equation in 1+1 dimensions
Creators: name: Ueno, K.
name: Sakaguchi, H.
name: Okamura, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The long-wavelength properties of a noisy Kuramoto-Sivashinsky (KS) equation in 1+1 dimensions are investigated by use of the dynamic renormalization group (RG) and direct numerical simulations. It is shown that the noisy KS equation is in the same universality class as the Kardar-Parisi-Zhang (KPZ) equation in the sense that they have scale invariant solutions with the same scaling exponents in the long-wavelength limit. The RG analysis reveals that the RG flow for the parameters of the noisy KS equation rapidly approach the KPZ fixed point with increasing the strength of the noise. This is supplemented by the numerical simulations of the KS equation with a stochastic noise, in which the scaling behavior of the KPZ equation can be easily observed even in the moderate system size and time.
description: 12pages, 7figures
Transmision de precios en la cadena comerical de la pesca costera gallega. El caso del pulpo
Creators: name: Dobano, Lucy Amigo
name: Garza Gil, M. Dalores
name: Lafuente, Manuel M. Varela
name: Dobano, Lucy Amigo
name: Garza Gil, M. Dalores
name: Lafuente, Manuel M. Varela
Publisher: name: Unknown
Year: 2009
Subjects: subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: Political Economy
subject: mercados pesqueros
subject: economia de la pesca
subject: analisis de mercados
subject: fishing markets
subject: fishing economy
subject: market analysis

description: En este trabajo se pretende analizar la transmision de precios a lo largo de la cadena de distribucion de uno de los productors mas significativos para la pesca costera de Galicia, el pulpo (Octopus vulgaris). En particular, utilizando series de precios mensuales para el periodo 1998-2004, se realiza un analisis de cointegracion y se estudian las causalidades a corto y largo plazo en la determinacion de los precios de los dos niveles de la cadena de comercializacion: lonjas y mayorista. Los resultados obtenidos ponen de manifiesto la existencia de una realzion de equilibrio a largo del precio en ambos mercados... In the Spanish and especially in Galician context, the exploitation of fishing resources has reached a large scale, whereby the coastal fishing segment in Galicia is one of the most important. The objective of this work is to analyze the situation of the Galician coastal segment from market point of view, for which one of its most representative fisheries will be considered: the case of the Octopus (Octopus vulgaris). In particular, with series of monthly prices for 1998-2004 period, the causality relations and prices transmission along distribution chain using cointegration methodology are studied. The results show stable relations between first sale markets and wholesaler prices in the long term. Then, variations in one of the two chain levels will generate variations in the other one.
Fermilab Collider Run II: Accelerator Status and Upgrades
Creators: name: Bhat, Pushpalatha C.
name: Spalding, William J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Fermilab will continue to maintain its pre-eminent position in the world of High Energy Physics, with a unique opportunity to make unprecedented studies of the top quark and major discoveries, until the Large Hadron collider (LHC) at CERN becomes operational near the end of the decade. Run II is well underway with major accelerator and detector upgrades since Run I. A program of further upgrades to the accelerator complex will result in an integrated luminosity of 4-8 fb-1 per experiment, by the year 2009.
description: 12 pages, 6 figures. To be published in the Proceedings of the 15th Topical Conference on Hadron Collider Physics, HCP2004, Michigan State University, East Lansing, MI, June 14-18, 2004 (American Institute of Physics, NY, 2004)
Hydrogen Burning on Magnetar Surfaces
Creators: name: Chang, P.
name: Arras, P.
name: Bildsten, L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compute the rate of diffusive nuclear burning for hydrogen on the surface of a "magnetar" (Soft Gamma-Ray Repeater or Anomalous X-Ray Pulsar). We find that hydrogen at the photosphere will be burned on an extremely rapid timescale of hours to years, depending on composition of the underlying material. Improving on our previous studies, we explore the effect of a maximally thick "inert" helium layer, previously thought to slow down the burning rate. Since hydrogen diffuses faster in helium than through heavier elements, we find this helium buffer actually increases the burning rate for magnetars. We compute simple analytic scalings of the burning rate with temperature and magnetic field for a range of core temperature. We conclude that magnetar photospheres are very unlikely to contain hydrogen. This motivates theoretical work on heavy element atmospheres that are needed to measure effective temperature from the observed thermal emission and constrains models of AXPs that rely on magnetar cooling through thick light element envelopes.
description: 4 pages, 2 figures, To be published in ApJ Letters
A JWST Preview: Adaptive-Optics Images of H$_2$, Br-$γ$, and K-continuum in Carina's Western Wall
Creators: name: Hartigan, Patrick
name: Downes, Turlough
name: Isella, Andrea
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the first wide-field near-infrared adaptive optics images of Carina's Western Wall (G287.38-0.62), one of the brightest and most well-defined irradiated interfaces known in a region of massive star formation. The new narrowband H$_2$ 2.12$μ$m, Br-$γ$ and K-continuum images trace the photoevaporative flow from the cloud and identify locations where UV-radiation from the surrounding massive stars excites molecular hydrogen to fluoresce. With a field of view of $\sim$ 1.5' $\times$ 2.9' and spatial resolution between 60 $-$ 110 mas, the new images show a spectacular level of detail over a large area, and presage what JWST should achieve. The Wall is convex in shape, with a large triangular-shaped extension near its apex. The interface near the apex consists of 3 $-$ 4 regularly-spaced ridges with projected spacings of $\sim$ 2000 AU, suggestive of a large-scale dynamically-important magnetic field. The northern edge of the Wall breaks into several swept-back fragments of width $\sim$ 1800 AU that resemble Kelvin-Helmholtz instabilities, and the southern part of the Wall also shows complex morphologies including a sinusoidal-like variation with a half-wavelength of 2500 AU. Though the dissociation front must increase the density along the surface of the Wall, it does not resolve into pillars that point back to the ionization sources, as could occur if the front triggered new stars to form. We discovered that MHO 1630, an H$_2$ outflow with no clear driving source in the northern portion of the Wall, consists of a series of bow shocks arrayed in a line.
description: Accepted in Astrophysical Journal Letters
Insights into the Non-exponential Behaviour of the Dielectric Debye-like Relaxation in Monoalcohols
Creators: name: Arrese-Igor, Silvia
name: Alegría, Angel
name: Arbe, Arantxa
name: Colmenero, Juan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: More than 100 years after Debye proposed his model for the dielectric relaxation of monoalcohols (MA), some fundamental questions about their dynamics and its relation with the supramolecular structures created by hydrogen bonding remain not fully understood. The recent detection of the dynamics of hydrogen-bonded aggregates by techniques other than dielectric spectroscopy is leading to novel insights and opening new questions. In particular it was recently reported that the shear response of some MA present three relaxation components, at variance with their apparent bimodal dielectric response. We show by mixing an archetype MA with LiCl that both shear and dielectric measurements are consistent with the presence of three separated contributions. Results are discussed in the more general context of MAs with non-exponential slow dielectric relaxations. In particular, we propose the recently reported third process as the origin of the unusual broadening of the Debye-like dielectric relaxation of some MAs.
description: 12 pages, 13 figures
Response of Windowless Silicon Avalanche Photo-Diodes to Electrons in the 90-900 eV Range
Creators: name: Apponi, Alice
name: Cavoto, Gianluca
name: Iannone, Marco
name: Mariani, Carlo
name: Pandolfi, Francesco
name: Paoloni, Daniele
name: Rago, Ilaria
name: Ruocco, Alessandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We report on the characterization of the response of windowless silicon avalanche photo-diodes to electrons in the 90-900 eV energy range. The electrons were provided by a monoenergetic electron gun present in the LASEC laboratories of University of Roma Tre. We find that the avalanche photo-diode generates a current proportional to the current of electrons hitting its active surface. The gain is found to depend on the electron energy $E_e$, and varies from $2.147 \pm 0.027$ (for $E_e = 90$ eV) to $385.8 \pm 3.3$ (for $E_e = 900$ eV), when operating the diode at a bias of $V_{apd} = 350$ V.} This is the first time silicon avalanche photo-diodes are employed to measure electrons with $E_e < 1$ keV.
THE DETERMINANTS OF HOUSEHOLDS’ FOOD CONSUMPTION IN GREECE
Creators: name: Kostakis, Ioannis
name: Kostakis, Ioannis
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Engel’ law
subject: consumer studies
subject: consumer behaviour
subject: food expenditures
subject: home economics

description: Several studies have been devoted on analyzing consumers’ characteristics on demand for specific kinds of food; however less attention has been paid to the parameters of the level of food expenditures and the willingness to change this level. The aim of this survey is to illustrate the focal determinants of household expenditures on food in Greece. The procedure of the statistical and econometric analysis estimates the profile of consumers who are aware of their expenditures on food, employing a cross-sectional data set from Athens and Crete. In particular, we carried out an extensive survey of 800 questionnaires, from October 2011 to February 2012, using the stratified random sampling method. We distributed 400 questionnaires in Athens and 400 questionnaires in Crete. The results showed that independent variables of demographic and socioeconomic traits such as income, gender, age, marital status, place of residence and status of employment have an important impact on household expenditures on food. In addition, further empirical analysis supports the first law of Engel in our data. Strong associations were found between demographic, socioeconomic parameters and consumer attitude in food expenditures experimentation.
Effective Abelian-Higgs Theory from SU(2) gauge field theory
Creators: name: Dzhunushaliev, V.
name: Singleton, D.
name: Dhokarh, D.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present work we show that it is possible to arrive at a Ginzburg-Landau (GL) like equation from pure SU(2) gauge theory. This has a connection to the dual superconducting model for color confinement where color flux tubes permanently bind quarks into color neutral states. The GL Lagrangian with a spontaneous symmetry breaking potential, has such (Nielsen-Olesen) flux tube solutions. The spontaneous symmetry breaking requires a tachyonic mass for the effective scalar field. Such a tachyonic mass term is obtained from the condensation of ghost fields.
description: 7 pages, 0 figures. Based on talk given at DPF2004
SparsePak: A Formatted Fiber Field-Unit for The WIYN Telescope Bench Spectrograph. II. On-Sky Performance
Creators: name: Bershady, Matthew A.
name: Andersen, David R.
name: Verheijen, Marc A. W.
name: Westfall, Kyle B.
name: Crawford, Steven M.
name: Swaters, Rob A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a performance analysis of SparsePak and the WIYN Bench Spectrograph for precision studies of stellar and ionized gas kinematics of external galaxies. We focus on spectrograph configurations with echelle and low-order gratings yielding spectral resolutions of ~10000 between 500-900nm. These configurations are of general relevance to the spectrograph performance. Benchmarks include spectral resolution, sampling, vignetting, scattered light, and an estimate of the system absolute throughput. Comparisons are made to other, existing, fiber feeds on the WIYN Bench Spectrograph. Vignetting and relative throughput are found to agree with a geometric model of the optical system. An aperture-correction protocol for spectrophotometric standard-star calibrations has been established using independent WIYN imaging data and the unique capabilities of the SparsePak fiber array. The WIYN point-spread-function is well-fit by a Moffat profile with a constant power-law outer slope of index -4.4. We use SparsePak commissioning data to debunk a long-standing myth concerning sky-subtraction with fibers: By properly treating the multi-fiber data as a ``long-slit'' it is possible to achieve precision sky subtraction with a signal-to-noise performance as good or better than conventional long-slit spectroscopy. No beam-switching is required, and hence the method is efficient. Finally, we give several examples of science measurements which SparsePak now makes routine. These include H$α$ velocity fields of low surface-brightness disks, gas and stellar velocity-fields of nearly face-on disks, and stellar absorption-line profiles of galaxy disks at spectral resolutions of ~24,000.
description: To appear in ApJSupp (Feb 2005); 19 pages text; 7 tables; 27 figures (embedded); high-resolution version at http://www.astro.wisc.edu/~mab/publications/spkII_pre.pdf
Two Methods for Decreasing the Computational Complexity of the MIMO ML Decoder
Creators: name: Fukatani, Takayuki
name: Matsumoto, Ryutaroh
name: Uyematsu, Tomohoko
Publisher: name: arXiv
Year: 2004
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We propose use of QR factorization with sort and Dijkstra's algorithm for decreasing the computational complexity of the sphere decoder that is used for ML detection of signals on the multi-antenna fading channel. QR factorization with sort decreases the complexity of searching part of the decoder with small increase in the complexity required for preprocessing part of the decoder. Dijkstra's algorithm decreases the complexity of searching part of the decoder with increase in the storage complexity. The computer simulation demonstrates that the complexity of the decoder is reduced by the proposed methods significantly.
description: 6 pages, 6 figures, using a LaTeX style file ieice.cls
title: The Nature Of The Relationships Between The Child, Their Parents And Teachers Within A Primary School, Working Together To Meet The Needs Of Children Defined As Having “Special Educational Needs”
Creators: name: James, Anthony William
Publisher: name: The Open University
Year: 2000

description: This dissertation is about how to help ensure that children considered to have special needs within the primary school context are enabled to overcome the difficulties they are facing. The premise of this dissertation is that this is most effectively achieved when the child, her teacher and her parents have a genuine role within the decision-making process concerning how to meet such needs. The functioning of the two key relationships in addressing these needs form the focus of this study. Specifically, these are the relationships between the child and her teacher, and her parents and her teacher. The literature relating to these relationships is explored. It seeks to blend the dual streams of literature relating to such relationships in the special needs context with that of the everyday relationships of primary school life. It explores the literature relating to the effect of the process of the Individual Education Plan on these relationships. It notes that the majority of such literature focuses on statemented children and often does not have a specific focus on the primary aged child at the earlier, school based stages of the Code of Practice (1994). This perceived "gap" in the research literature forms the rationale for the research study which follows. The research is within the practitioner-researcher tradition and is located withm the school that I am a teacher at. It is qualitative in nature with a focus on a detailed exploration of a small sample. It utilises an interview technique to gain its data. The study argues that while genuine involvement is often sought, and even presumed, the context of the primary school, the processes of special education and the attitudes of the participants to the relationships tend to result in the teacher retaining the dominant role within the decision making process. It also suggests that the process of the Individual Education Plan may have a somewhat different effect on functioning of the two relationships from that which is often described within the literature. The dissertation concludes by drawing out the factors which appear to determine whether such relationships are genuinely involving, or not. These are described. It then suggests one way in which the findings of the research may be practically applied to enhancing the quality of the two relationships which form the basis of this study and so ensure that the needs of the children within the primary school context are most effectively met.
Classical Nova Carinae 2018: Discovery of circumbinary iron and oxygen
Creators: name: McLoughlin, Dominic
name: Blundell, Katherine M.
name: Lee, Steven
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present time-lapse spectroscopy of a classical nova explosion commencing 9 days after discovery. These data reveal the appearance of a transient feature in Fe II and [O I]. We explore different models for this feature and conclude that it is best explained by a circumbinary disc shock-heated following the classical nova event. Circumbinary discs may play an important role in novae in accounting for the absorption systems known as THEA, the transfer of angular momentum, and the possible triggering of the nova event itself.
Additional file 2 of Serotype independent protection induced by a vaccine based on the IgM protease of Streptococcus suis and proposal for a new immunity-based classification system
Creators: name: Jacobs, A. A. C.
name: Grommen, A. W. F.
name: Badbanchi, S.
name: van Hout, A. J.
name: van Kasteren-Westerneng, T. J.
name: Morales, L. Garcia
name: Bron, R.
name: Segers, R. P. A. M.
Publisher: name: figshare
Year: 2024
Subjects: subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology

description: Supplementary Material 2
Evolution of spin excitations from bulk to monolayer FeSe
Creators: name: Pelliciari, J.
name: Karakuzu, S.
name: Song, Q.
name: Arpaia, R.
name: Nag, A.
name: Rossi, M.
name: Li, J.
name: Yu, T.
name: Chen, X.
name: Peng, R.
name: Garcia-Fernandez, M.
name: Walters, A. C.
name: Wang, Q.
name: Zhao, J.
name: Ghiringhelli, G.
name: Feng, D.
name: Maier, T. A.
name: Zhou, K. -J.
name: Johnston, S.
name: Comin, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The discovery of enhanced superconductivity (SC) in FeSe films grown on SrTiO3 (FeSe/STO) has revitalized the field of Fe-based superconductors. In the ultrathin limit, the superconducting transition temperature Tc is increased by almost an order of magnitude, raising new questions on the pairing mechanism. As in other unconventional superconductors, antiferromagnetic spin fluctuations have been proposed as a candidate to mediate SC in this system. Thus, it is essential to study the evolution of the spin dynamics of FeSe in the ultrathin limit to elucidate their relationship with superconductivity. Here, we investigate and compare the spin excitations in bulk and monolayer FeSe grown on STO using high-resolution resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to the bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems. The present study reveals a remarkable reconfiguration of spin excitations in FeSe/STO, which is essential to understand the role of spin fluctuations in the pairing mechanism.
A new hexenoic acid glycoside with cytotoxic activity from the leaves of Psychotria luzoniensis
Creators: name: Ramil, Rhian Jaymar D.
name: Ma. Danica I. Ramil
name: Konno, Taisuke
name: Murata, Toshihiro
name: Kobayashi, Kyoko
name: Buyanmandakh Buyankhishig
name: Agrupis, Shirley C.
name: Kenroh Sasaki
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: Plant Biology

description: A new hexenoic acid glycoside (1) together with known compounds, flavonol glycosides (2–4), iridoid glycoside (5), megastigmane glycoside (6), and amino acid (7) were isolated from the leaves of P. luzoniensis by resin column chromatography and preparative HPLC. Their structures were determined based on spectroscopic analysis, including HRFABMS and NMR (1H and 13C, 1H−1H COSY, HMQC, and HMBC) data. All compounds tested for cytotoxicity were active (IC50 < 50 μM) with IC50 values ranging from 1.97 to 32.85 μM against human colon adenocarcinoma cell line, compared to etoposide (IC50 1.19 μM).
Dark Matter from a Radiative Inverse Seesaw Majoron Model
Creators: name: Bonilla, Cesar
name: Hernández, A. E. Cárcamo
name: Sáez, Bastián Díaz
name: Kovalenko, Sergey
name: González, Juan Marchant
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a Majoron-like extension of the Standard Model with an extra global $U(1)_X$-symmetry where neutrino masses are generated through an inverse seesaw mechanism at the 1-loop level. In contrast to the tree-level inverse seesaw, our framework contains dark matter (DM) candidates stabilized by a residual $\mathcal{Z}_2$-symmetry surviving spontaneous breaking of the $U(1)_X$-group. We explore the case in which the DM is a Majorana fermion. Furthermore, we provide parameter space regions allowed by current experimental constraints coming from the dark matter relic abundance, (in)direct detection, and charged lepton flavor violation.
description: 15 pages, 6 figures
Air plasma spraying of SOFC composite cathodes
Creators: name: White, Bradley
Publisher: name: University of British Columbia
Year: 2010

description: Air plasma spraying (APS) has been used to produce porous composite cathodes containing (La0.8Sr0.2)0.98Mn(LSM) and yttria stabilized zirconia (YSZ) for use in solid oxide fuel cells (SOFCs). Preliminary investigations focused on determining the range of plasma conditions under which each of the individual materials could be successfully deposited. A range of conditions was thereby determined that were suitable for the deposition of a composite cathode from pre-mixed LSM and YSZ powders. A proof of concept SOFC containing a plasma sprayed composite cathode was then produced and tested to confirm the desired electrochemical properties of the coating had been obtained. Many composite cathodes were then produced using different combinations of parameter values within the identified range. Successful coatings were then characterized for composition and microstructure using EDX and SEM. As a result of these tests, combinations of input parameter values were identified that are best suited to the production of coatings with microstructures appropriate for use in SOFC composite cathodes. A selection of coatings representative of the types of observed microstructures were then subjected to electrochemical testing to evaluate the performance of these cathodes. From these tests it was confirmed that the coatings that appeared to have the most suitable microstructures showed the best performance. Finally, a procedure was developed to allow for the deposition of cathode symmetric cells entirely by APS using porous metal interconnect substrates. This will allow for the electrochemical evaluation of cells produced as part of future optimization studies using a production process similar to that expected to be used in the eventual commercial production of SOFCs by APS. Keywords: Solid Oxide Fuel Cell, Air Plasma Spraying, Composite Cathode, LSM, YSZ
Modification and Implementation of the spatial evaluation method MODEmod for its operational use in Cuba
Creators: name: Rodríguez-Genó, Camilo Fernando
name: Maybis Sierra Lorenzo
name: Adríán Luis Ferrer Hernández
Publisher: name: figshare
Year: 2021
Subjects: subject: Atmospheric Sciences
subject: FOS: Earth and related environmental sciences
subject: 40107 Meteorology

description: In the present study a modification of the Modified Method for Object-Based Diagnostic Evaluation (MODEMod) is developed to evaluate the forecast of discrete variables using the processed images in TIFF or ASCII format from meteorological satellites. Integrated cloud fraction forecast from WRF model and images from satellite GOES-13 are used to check the performance of the proposed method. The method recognizes the cloud areas as result of convolution and thresholding processes, which allowed grouping the most significant cloud areas and filtering the weaker features. A fuzzy logic algorithm is used in order of merge objects of the same field, and match similar objects of different fields. The tool developed allows verifying the prediction of elements such as precipitation, convection and clouds, whose spatial variability, structure and specific location may hinder the forecast.
Structural Behavior of Non-Oxide Perovskite Superconductor MgCNi$_{3}$ at Pressures up to 32 GPa
Creators: name: Kumar, Ravhi S
name: Cornelius, A. L.
name: Shen, Yongrong
name: Kumary, T. Geetha
name: Janaki, J.
name: Valsakumar, M. C.
name: Nicol, Malcolm F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report the pressure dependence of the structural parameters of the non-oxide perovskite superconductor MgCNi$_{3}$ up to 32 GPa using a diamond anvil cell and synchrotron x-rays at room temperature. The structure of the compound remains in the Pm-3m cubic symmetry throughout the pressure range. The bulk modulus $B_{0}=156.9\pm0.2$GPa with $B_{0}^{\prime}=9.8$obtained by fitting the pressure-volume data is in good agreement with theoretical calculations reported earlier. An anomalous shift of the (111) and (200) lines observed above 9 GPa indicates a possible local short range distortion that is consistent with earlier studies.
description: 9 Pages, 3 Figures, 1 Table
PRODUCTIVITY MANAGEMENT ANALYSIS OF CACAO AGRO-FOOD SYSTEM IN TABASCO, MEXICO: AN APPLICATION OF THE ‘FITNESS’ APPROACH
Creators: name: Navarrete, César J. Vázquez
name: Rahman, Sanzidur
name: Navarrete, César J. Vázquez
name: Rahman, Sanzidur
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: Fitness approach
subject: productivity management perspective
subject: cacao agro-food system
subject: Mexico

description: Survival of agro-food systems are challenging and require a fresh approach to analyse. Application of ‘productivity management’ perspective extends the conventional view of ‘productivity’ as it incorporates both ‘efficiency (creation of value)’ and ‘effectiveness (attraction of value)’ criteria into a firm’s organisational configurations (set of strategies) to achieve success. We apply a ‘fitness’ approach to examine productivity performance of 356 cacao farmers in Tabasco, Mexico. Results reveal that both ‘factors’ and ‘aspects’ of organisational configurations are significantly positively correlated with the performance indicators. Also, 14 of the 20 productivity management elements are significantly correlated with the performance indicators with three elements (‘participation in organic cacao production’, ‘farmer’s schooling’, and ‘price setting’) exerting strongest influence. Results also show that a set of fittest solutions, rather than a unique solution, exist amongst cacao farmers. The key policy implication is that both ‘efficiency’ and ‘effectiveness’ are valid strategies to cope with the challenging and competitive agro-food system environment. Policy makers should be aware of a set of solutions (fitness landscape) instead of just focusing on a unique solution.
MONTHLY PRICE ANALYSIS OF COWPEA (BEANS) AND MAIZE IN AKWA IBOM STATE, SOUTHERN NIGERIA
Creators: name: Akpan, Sunday Brownson
name: Udoh, Edet Joshua
name: Udo, Udoro Jacob
name: Akpan, Sunday Brownson
name: Udoh, Edet Joshua
name: Udo, Udoro Jacob
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: Production Economics
subject: Productivity Analysis
subject: Market
subject: Maize
subject: Beans
subject: price
subject: integration
subject: agricultural
subject: Akwa Ibom
subject: Nigeria

description: The study examined the price transmission and market integration of Maize and Beans in the rural and urban markets of Akwa Ibom State, Nigeria. Average monthly prices (measured in naira per kilogram) of Maize and Cowpea in rural and urban markets were used in the analysis. The data was obtained from the quarterly publications of the Akwa Ibom State Agricultural Development Programme (AKADEP). The data covered the period; January 2005 to June 2013. The trend analysis showed that, prices of Maize and Beans in the rural and urban markets had exponential growth rates that were less than unity, which suggested a possible co-movement of these prices in the study area. Also, the Pearson correlation coefficient generated for the pair of rural and urban prices of Maize and Beans revealed significant linear symmetric relationships. The result implies the existence of symmetric market information flows between the rural and urban markets for Maize and Beans in the state. The Granger causality test revealed bi-directional relationships between the rural and urban price of Maize and Beans in the study area. The co-integration test revealed the presence of co-integration between the rural and urban prices of Maize and Beans. The coefficients of the price variables in the co-integration equations for Maize and Beans markets converged to unity or law of one price which implied perfect market integration in the long run. The results of the error correction model (ECM) also confirm the existence of the short run market integration between the rural and urban prices of Maize and Beans in the study area. In addition, it was discovered that, the rural price of Maize adjusted faster to the stable state in the long run than the urban price. Likewise, the urban price of Beans adjusted faster than its corresponding rural price. The index of market connection (IMC) supported the high short run market integration for prices of Maize and Beans in rural and urban markets. Based on the findings, it is recommended that, the Akwa Ibom State government should continue to provide marketing infrastructures and reduced externality costs in order to improve further the symmetric nature of information flow among Maize and Beans markets in the state. Also, individuals, trade unions, NGOs’ and government should established market information units and awareness programmes on mass media to facilitate efficient communication flows of Beans and Maize markets in the state.
Optical signatures of charge order in a Mott-Wigner state
Creators: name: Shimazaki, Yuya
name: Kuhlenkamp, Clemens
name: Schwartz, Ido
name: Smolenski, Tomasz
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Kroner, Martin
name: Schmidt, Richard
name: Knap, Michael
name: Imamoglu, Atac
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The elementary optical excitations in two dimensional semiconductors hosting itinerant electrons are attractive and repulsive polarons -- excitons that are dynamically screened by electrons. Exciton-polarons have hitherto been studied in translationally invariant degenerate Fermi systems. Here, we show that electronic charge order breaks the excitonic translational invariance and leads to a direct optical signature in the exciton-polaron spectrum. Specifically, we demonstrate that new optical resonances appear due to spatially modulated interaction between excitons and electrons in an incompressible Mott state. Our observations demonstrate that resonant optical spectroscopy provides an invaluable tool for studying strongly correlated states, such as Wigner crystals and density waves, where exciton-electron interactions are modified by the emergence of new electronic charge or spin order.
description: Main text: 9 pages, 5 figures; Supplemental Material: 9 pages, 5 figures
Observation of the ion-ion instability and its suppression mechanism in a dusty double plasma device
Creators: name: Sarma, Arun
name: Sarma, Bornali
name: Ionita, Codrina
name: Schrittwieser, Roman
name: Nakamura, Yoshiharu
Publisher: name: arXiv
Year: 2004
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Ion-ion instability is excited due to the counter streaming of ion beams in any plasma system. An experiment has been carried out to observe the ion-ion instability in dusty plasma and in presence of different gas compositions viz., H2, Ar, Xe and He. The experiment is performed in a double plasma device consisting of 90 cm in diameter and 120 cm in length and separated by a mesh grid of 81% optical transparency. Glass beads of 10 mm average dust distributions are used as a dust grains for the whole set of experiment and are allowed to fall within a particular region of plasma column inside the system. The growing and suppression of ion-ion instability is observed by translating the probe spatially with respect to different dust density compositions and compared the same also in presence of other gasses. The suppression mechanism of this kind of instability in plasmas was explained by RF pumps[1]. However, in this experimental finding the suppression phenomena are discussed in terms of dust density inside the system. The instability is found to be suppressed completely at a critical dust density (Ndcr). The complete set of experimental results will be tried to explain with the numerical solution of Van der Pol Equation.
description: 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
title: Indeterminacy and Chanson
Creators: name: Hayward, David Anthony Russell
Publisher: name: University of Kent
Year: 2025

description: Indeterminacy and Chanson considers uncertainty from both academic and creative perspectives, the former through the dissertation, Indeterminacy: An Investigation, which investigates the specific idea of Indeterminacy, and the latter in the accompanying Chanson: A Creative Collection. The dissertation's investigation of Indeterminacy is undertaken from various viewpoints including the relationship between Indeterminacy and metaphor, the use of the term Indeterminacy in literary theory (and the dissertation's proposal of its own definition), the related consideration of John Ashbery's 'The Skaters' and Lyn Hejinian's My Life, and the final bridging chapter which relates the foregoing academic analysis to the creative collection. Chanson is a collection of poetry that comprises eleven sequences of poems in various forms of presentation, ranging from single and multi-column arrangements to prose poetry and images. Its time of writing can be summarised as from the final phase of the pandemic, through the brief phase of apparent recovery, and on to the renewed uncertainty of the current period. Its poems combine personal experience and related writing, and elements from historical literary texts including the anonymous La Chanson de Roland, Chaucer's House of Fame and Jean de La Fontaine's version of the fable, ''The Wolf and the Lamb''. Chanson: A Creative Collection's subject matter is approached from experiential and analytical perspectives, the latter including the relationship between writing and mortality, textual and visual expression, the collection of different objects and their association, and the inherent uncertainty (if not failure) of language to recount experience. Indeterminacy is not a word used in Chanson but a principal result of its writing was the discovery the essential condition of the poems is uncertainty, in various different ways, and related attempts, through the compositional process, to achieve a measure of certainty, failed or otherwise.
Additional file 2 of Usability and feasibility of an online intervention for older adults to support changes to routines and the home ('Light, activity and sleep in my daily life')
Creators: name: Gerhardsson, Kiran M.
name: Hassan, Mariam
name: Tornberg, Åsa B.
name: Schmidt, Steven M.
Publisher: name: figshare
Year: 2024
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: Supplementary Materials 2. Observer-based environmental assessment form