cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
تقنيات غير تقليدية للتنمية الزراعية: زراعة النباتات الملحية علي مياه البحر
Creators: name: Soliman, Ibrahim
name: Soliman, Ibrahim
Publisher: name: Unknown
Year: 2003
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Food Security and Poverty
subject: Public Economics
subject: Research and Development/Tech Change/Emerging Technologies
subject: Non-traditional techniques for agricultural development: the cultivation of halophytes seawater
subject: halophytes seawater

description: Conference on the future of the African food security folder, Research Institute of African Studies, University of Cairo, Giza, Egypt, 2003
R&D and production of the scintillation detectors for the IceCube Surface Array Enhancement
Creators: name: Shefali, Shefali
name: IceCube Collaboration
Publisher: name: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Year: 2023

description: The IceCube Neutrino Observatory is a cubic kilometer scale detector deployed in the Antarctic ice. The surface array of IceCube, IceTop, serves as an air-shower detector for primary cosmic rays in the PeV energy range and operates as a veto and calibration detector for the astrophysical neutrino searches for
the IceCube in-ice instrumentation. Enhancing IceTop with a hybrid array of scintillation detectors and radio antennas will lower the energy threshold for air-shower measurements, provide more efficient veto capabilities, enable the separation of the electromagnetic and muonic shower components, and significantly improve the detector calibration by compensating for snow accumulation.
A prototype station consisting of 3 radio antennas and 8 scintillation detectors was deployed at the South Pole in 2020, and has yielded promising results since. The production of the full surface array enhancement is ongoing. In this contribution we will focus on the status of the production and calibration methods for the scintillation panels. A brief introduction to the expected data and proposed
analysis from the enhancement is also discussed.
title: The silent experiences of young bilingual learners : a small scale sociocultural study into the silent period
Creators: name: Bligh, Caroline
Publisher: name: The Open University
Year: 2011

description: This ethnographic study focuses upon the experiences of a small number of early years bilingual learners' during the emergent stage of English language acquisition - the silent period.

 Building upon historical understandings of sociocultural theory, Vygotsky (1986), Lave and Wenger (1991), Wenger (1998), Rogoff (2003) and Gee (2004) provide the platform upon which the evolution of sociocultural learning theory is applied and tested out in relation to the interconnectedness of the spoken mother tongue, thought, and learning.

 Legitimate peripheral participation is examined as a workable concept through which to explore the initial learning trajectory of an emergent bilingual learner whilst negotiating participation within, through and beyond the early years community of practice during the silent period.

 A multi-method ethnographic approach to data gathering adopts Flewitt's (2005) `gaze following', as an alternative means of participant observation through which to identify silent participation within an early years setting. Additional ethnographic methods include unstructured interviews with bilingual and monolingual participants, which are interspersed with significant auto-ethnographic accounts.

 Funnelling the data through thematic analysis facilitates both the emergence of significant patterns and the `encapsulation' of significant data within vignettes. Sociocultural theory is tested out against the research findings through the analysis of nine selected vignettes.

The findings present the silent period as a crucial time for learning; distributed through a synthesis of close observation, intense listening and copying. Examining the silent period through a sociocultural lens tentatively reveals silent participation as a significant but lesser acknowledged contribution to the early years community of practice.
الثقافة البيئية ومفاهيم التنمية في القرن الحادي والعشرين
Creators: name: Soliman, Ibrahim
name: Soliman, Ibrahim
Publisher: name: Unknown
Year: 2012
Subjects: subject: Environmental Economics and Policy
subject: Public Economics
subject: Teaching/Communication/Extension/Profession
subject: Environmental education development concepts in the twenty-first century
subject: Environmental education development
subject: education development

description: Seminar on Environmental education and its role in supporting the the Egyptian economy, the Supreme Council for Culture, April 12, 2012
Symmetry-resolved entanglement in symmetry-protected topological phases
Creators: name: Azses, Daniel
name: Sela, Eran
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Symmetry protected topological phases (SPTs) have universal degeneracies in the entanglement spectrum in one dimension (1D). Here, we formulate this phenomenon in the framework of symmetry-resolved entanglement (SRE) using cohomology theory. We develop a general approach to compute entanglement measures of SPTs in any dimension and specifically SRE via a discrete path integral on multi-sheet Riemann surfaces with generalized defects. The resulting path integral is expressed in terms of group cocycles describing the topological actions of SPTs. Their cohomology classification allows to identify universal entanglement properties. Specifically, we demonstrate an equi-block decomposition of the reduced density matrix into symmetry sectors, for all 1D topological phases protected by finite Abelian unitary symmetries.
description: Published version. 15 pages, 6 figures
Capacity-achieving ensembles for the binary erasure channel with bounded complexity
Creators: name: Pfister, H.
name: Sason, I.
name: Urbanke, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We present two sequences of ensembles of non-systematic irregular repeat-accumulate codes which asymptotically (as their block length tends to infinity) achieve capacity on the binary erasure channel (BEC) with bounded complexity per information bit. This is in contrast to all previous constructions of capacity-achieving sequences of ensembles whose complexity grows at least like the log of the inverse of the gap (in rate) to capacity. The new bounded complexity result is achieved by puncturing bits, and allowing in this way a sufficient number of state nodes in the Tanner graph representing the codes. We also derive an information-theoretic lower bound on the decoding complexity of randomly punctured codes on graphs. The bound holds for every memoryless binary-input output-symmetric channel and is refined for the BEC.
description: 47 pages, 9 figures. Submitted to IEEE Transactions on Information Theory
تطوير أساليب تقدير العرض المحلي للحوم الحمراء
Creators: name: Soliman, Ibrahim
name: Soliman, Ibrahim
Publisher: name: Unknown
Year: 2007
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Political Economy
subject: Production Economics
subject: Public Economics
subject: Develop methods estimate the local supply of red meat
subject: red meat
subject: meat

description: Seminar on livestock statistics in Egypt. organized by the Egyptian Association of Agricultural Economics. Club agricultural Dokki, Egypt, July 2007
Rozwój energetyki prosumenckiej w świetle nowej ustawy o odnawialnych źródłach energii
Creators: name: Błażejowska, Małgorzata
name: Błażejowska, Małgorzata
Publisher: name: Unknown
Year: 2015
Subjects: subject: Consumer/Household Economics
subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: microinstallation
subject: prosumer
subject: renewable energy sources
subject: support

description: The article analysis of EU and national legal acts regulating the energy prosumer and strategic documents affecting the development of distributed energy in Poland. The creation of a new law on renewable energy sources offers opportunities for the development of microinstallations in our country, but some changes are necessary. An important factor is the support system in the form feed-in tariffs, which should not be in the near future subject to change. Thanks to him according to the assumption of the 2020 uprising in Poland more than 200 thousand microinstallations.
Paragraph S1a-d. Materials and Methods from Sponge symbiosis is facilitated by adaptive evolution of larval sensory and attachment structures in barnacles
Creators: name: Meng-Chen Yu
name: Dreyer, Niklas
name: Kolbasov, Gregory Aleksandrovich
name: Høeg, Jens Thorvald
name: Chan, Benny Kwok Kan
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences

description: Symbiotic relations and range of host usage are prominent in coral reefs and crucial to the stability of such systems. In order to explain how symbiotic relations are established and evolve, we used sponge-associated barnacles to ask (1) Does larval settlement on sponge hosts require novel adaptations facilitating symbiosis? (2) How do larvae settle and start life on their hosts? (3) How has this remarkable symbiotic lifestyle involving many barnacle species evolved? We found that the larvae (cyprids) of sponge-associated barnacles show a remarkably high level of interspecific variation compared with other barnacles. We document that variation in larval attachment devices are specifically related to properties of the surface on which they attach and metamorphose. Mapping of the larval and sponge surface features onto a molecular-based phylogeny showed that sponge symbiosis evolved separately at least three times within barnacles, with the same adaptive features being found in all larvae irrespective of phylogenetic relatedness. Furthermore, the metamorphosis of two species proceeded very differently, with one species remaining superficially on the host and developing a set of white calcareous structures, the other embedding itself into the live host tissue almost immediately after settlement. We argue that such a high degree of evolutionary flexibility of barnacle larvae played an important role in the successful evolution of complex symbiotic relationships in both coral reefs and other marine systems.
Production, characterization, and elucidation of structure-function relationship of lactoferricin and other peptides derived from food-grade bovine lactoferrin
Creators: name: Chan, Judy Chuk Kwan
Publisher: name: University of British Columbia
Year: 2010

description: Lactoferricin (Lfcin), a cationic antimicrobial peptide, was purified by peptic digestion of food grade bovine lactoferrin (LF) followed by fractionation on an industrial grade cation exchange resin with stepwise salt gradient elution. A 2-step process using competitive displacement cation exchange chromatography led to 35% recovery of peptides with masses of 3124 and 3196 Da corresponding to Lfcin. Other cationic peptides produced concurrently with Lfcin were tentatively identified. Varying iron saturation levels of LF had no effect on the production of Lfcin. Two approaches were used to understand how Lfcin acts as an antimicrobial agent. Homology Similarity Analysis (HSA) was used to evaluate the impact of peptide pattern similarities of various Lfcin derivatives on their effects as antimicrobial agents. Helical property of residues 4-9 in the Lfcin sequence was the most important in determining the antimicrobial activity of Lfcin against Escherichia coli, followed by cationic charge pattern of residues 4-9 and residues 1-3. Raman spectroscopy in the C-H stretching (2800-3000 cm⁻¹) region was used to study interactions between Lfcin and bacterial membrane models. Presence of Lfcin in 1,2-dipalmitoyl-sn-glycerol-3-phosphocholine (DPPC) multilamellar liposomes restricted the lateral chain-chain interaction along the acyl chain throughout the temperature range examined, and increased the main transition temperature (Tm) from 38-40°C. Lfcin had little effect on 1,2-dipalmitoyl-sn-glycerol-3-[phosphor-rac-(1-glycerol)] (DPPG) liposomes at temperatures below the Tm. In contrast, mobility of the acyl chains in 1,2-dipalmitoyl-sn-glycerol-3-phosphoethanolamine (DPPE) was increased in the presence of Lfcin at temperatures below 32°C. Although Lfcin had little effect on the zwitterionic unsaturated phospholipids, 1-palmitoyl-2-oleoyl-sn-glycerol-3-phosphocholine (POPC) and 1-palmitoyl-2-oleoyl-sn-glycerol-3-phosphoethanolamine (POPE), Lfcin lowered the lateral chain-chain interaction along the acyl chains of negatively charged 1-palmitoyl-2-oleoyl-sn-glycerol-3-[phosphor-rac-(1-glycerol)] (POPG). Raman spectral analyses also showed that the removal of arginine promoted interactions of Lfcin derivatives with hydrophobic acyl chains and methyl ends of negatively charged DPPG liposomes. Furthermore, addition of two extra tryptophan residues in Lfcin derivatives stabilized acyl chains and methyl ends in DPPE liposomes. HSA and Raman spectroscopy are two useful tools for understanding the antimicrobial mechanisms of Lfcin and will facilitate the application and utilization of Lfcin as a naturally occurring antimicrobial agent.
O spójności w planowaniu strategicznym dla rozwoju obszarów wiejskich
Creators: name: Czarnecki, Adam
name: Czarnecki, Adam
Publisher: name: Unknown
Year: 2015
Subjects: subject: Community/Rural/Urban Development
subject: Political Economy
subject: strategic planning
subject: development strategies
subject: development of rural areas
subject: consistency

description: Strategic planning is a systematic process of envisioning a desired future, and translating this vision into broadly defined goals or objectives and a sequence of steps to achieve them [Smallwood 2014]. Strategic planning is crucial in aligning efforts and identifying critical resources in achieving development objectives. Since several decades it has been used successfully in private as well as in public sector while implementing development policies. A large number and variety of performed strategies require to keep consistency among them. In this paper some selected documents strategic for rural economic development of Poland were examined and assessed from the point of view of consistency. A consistency is one of crucial characteristics shaping possibilities and ways of coordination and completeness of implementation of varied strategies. A particular emphasis was put on entrepreneurship, i.e. position, approaches, diagnosis and forecast of business development in national strategic documents as well as planned actions and measures for entrepreneurship. Despite the variety of current national strategies as well as significant differences in approaching the issue one may state that in the context of rural economic development the strategic documents provide the rule of consistency to a large extent.
Correlation of variations in species abundance of Atlantic forests regenerating on abandoned pastures with different environmental and spatial variables
Creators: name: de Maçaneiro, João Paulo
name: Oliveira, Laio Zimermann
name: Schorn, Lauri Amândio
name: Galvão, Franklin
name: Grittz, Guilherme Salgado
name: de Gasper, André Luís
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: The conversion of native forests into pastures is still a common practice in Brazil. Abandoned pastures have great potential for natural regeneration and therefore could play an important role in meeting the enormous demand for forest restoration. Few studies, however, have investigated the extent to which spatially-structured environmental variables and community structure are correlated with the variation in species abundance of regenerating forests on abandoned pastures. Therefore, we aimed to determine whether environmental and spatial variables were capable of explaining the variation in abundance of woody species on abandoned pastures in the subtropical Atlantic Forest. We systematically distributed 45 sample plots with size and inclusion criteria that changed according to the vegetation layer in three different abandoned pastures. In general, most of the variation in species abundance that our models were able to explain was correlated with spatially-unstructured physical-chemical soil properties. A smaller part of the variation was correlated with spatially-structured soil variables and topography-related variables. An even smaller portion of the variation was spatially-structured but was not correlated with spatially-structured environmental variables. Therefore, our results suggest that the variation in species abundance of regenerating subtropical Atlantic forests on abandoned pastures is more closely related to niche-based processes mediated by environmental variables than to stochastic spatial processes.
BPS Skyrme neutron stars in generalized gravity
Creators: name: Adam, C.
name: Huidobro, M.
name: Vazquez, R.
name: Wereszczynski, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the coupling of nuclear matter described by the BPS Skyrme model to generalized gravity. Concretely, we consider the Starobinsky model which provides the leading-order correction to the Einstein-Hilbert action. Static solutions describing neutron stars are found both for the full field theory and for the mean-field approximation. We always consider the full Starobinsky model in the nonperturbative approach, using appropriately generalized shooting methods for the numerical neutron star calculations. Many of our results are similar to previous investigations of neutron stars for the Starobinsky model using other models of nuclear matter, but there are some surprizing discrepancies. The "Newtonian mass" relevant for the surface redshift, e.g., results larger than the ADM mass in our model, in contrast to other investigations. This difference is related to the particularly high stiffness of nuclear matter described by the BPS Skyrme model and offers an interesting possibility to distinguish different models of nuclear matter within generalized gravity.
description: LaTex, 28 pages, 13 figures; v2: minor changes
Semileptonic Hyperon Decays on the Lattice: an Exploratory Study
Creators: name: Guadagnoli, D.
name: Martinelli, G.
name: Papinutto, M.
name: Simula, S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present preliminary results of an exploratory lattice study of the vector form factor $f_1(q^2 = 0)$ relevant for the semileptonic hyperon decay $Σ^{-} --> n l ν$. This study is based on the same method used for the extraction of $f^+(0)$ for the decay $K^0 --> π^{-} l ν$. The main purpose of this study is to test the method for hyperon form factors in order to estimate the precision that can be reached and the importance of SU(3)-breaking effects.
description: 3 pages, 5 figures, talk presented at Lattice2004(weak), Fermilab, Batavia, Illinois, 21-26 June 2004
Declaración de interoperabilidad de metadatos Repositorio Institucional Universidad Central de Chile (v02.2023)
Creators: name: Abedrapo Rosen, Isabel
name: Meneses Jorquera, Antia
Publisher: name: Zenodo
Year: 2023
Subjects: Interoperabilidad
Repositorio Institucional
Metadatos

description: Declaración de interoperabilidad de metadatos del Repositorio Institucional de la Universidad Central de Chile, en el que se encuentra detallado los esquemas (DataCite, OpenAire y locales) utilizados por el mismo y su equivalencia en Dublin Core para la facilitar el proceso de cosecha de otras plataformas.
Además contempla la descripción de los campos generados de manera local.
Multipole moments of compact objects with NUT charge: Theoretical and observational implications
Creators: name: Mukherjee, Sajal
name: Chakraborty, Sumanta
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive the multipole moments of the Kerr-NUT black hole spacetime using the Geroch-Hansen formalism, even though the spacetime is not asymptotically flat. Intriguingly, in the presence of the NUT charge, the absence of reflection symmetry about the equatorial plane, leads to mass and spin multipole moments of all orders, in stark contrast to Kerr-like spacetimes. This leads to a drastic departure of the multipolar structure of a compact object with NUT charge, whose implications for gravitational wave observations have been explored. Our analysis of multipole moments for the Kerr-NUT spacetime is also in tune with the Thorne's approach.
description: v2, 33 pages, 1 figure
Renty polityczne w nowym paradygmacie rolnictwa – rozważania na przykładzie gospodarstwa reprezentatywnego FADN w Polsce
Creators: name: Czyżewski, Bazyli
name: Czyżewski, Bazyli
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Political Economy
subject: theory of public choice
subject: political rent
subject: sustainable agriculture
subject: CAP

description: Since the beginning of human civilization, the land has been creating certain utilities which satisfy human needs. When the dangerous side effects of industrial agriculture have occurred intrinsic land utilities are being discovered anew. They have a nature of public goods and constitute a hard core of the new agriculture paradigm. Despite irreversible accumulation of capital in the anthropogenic environment many new utilities of the land come into existence without additional capital and labour outlay. Since they are public goods, they are paid from taxes in great measure and then by the subsidies for agriculture of CAP. This way an intrinsic land utility takes a form of a financial product and can be called “intrinsic productivity” of land. According to the “induced innovation model of agricultural development” there exist mechanisms for this sector’s participation in contributing to economic development as well as in sharing its benefits. Nonetheless, inefficiencies of the market that distort market signals, constitute a barrier of the latter process. Therefore, so-called “surplus drainage” from agriculture takes place. Author claims that it is possible to objectively measure a “surplus drainage” from agriculture as a result of a market failure, i.e. information asymmetry. For that reason the drainage has to be compensated to correct this failure. The mentioned premises imply that the CAP’s subsidies should not be perceived as the political rents according to its classical definition. Only a part of subsidies left after subtracting a value of “surplus drainage” and a compensation of public goods has a hallmark of the rent. A valuation of these values is an important scientific challenge.
Interaction-induced topological properties of two bosons in flat-band systems
Creators: name: Pelegrí, G.
name: Marques, A. M.
name: Ahufinger, V.
name: Mompart, J.
name: Dias, R. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In flat-band systems, destructive interference leads to the localization of non-interacting particles and forbids their motion through the lattice. However, in the presence of interactions the overlap between neighbouring single-particle localized eigenstates may enable the propagation of bound pairs of particles. In this work, we show how these interaction-induced hoppings can be tuned to obtain a variety of two-body topological states. In particular, we consider two interacting bosons loaded into the orbital angular momentum $l=1$ states of a diamond-chain lattice, wherein an effective $π$ flux may yield a completely flat single-particle energy landscape. In the weakly-interacting limit, we derive effective single-particle models for the two-boson quasiparticles which provide an intuitive picture of how the topological states arise. By means of exact diagonalization calculations, we benchmark these states and we show that they are also present for strong interactions and away from the strict flat-band limit. Furthermore, we identify a set of doubly localized two-boson flat-band states that give rise to a special instance of Aharonov-Bohm cages for arbitrary interactions.
Declaración de interoperabilidad de metadatos Repositorio Institucional Universidad Central de Chile
Creators: name: Universidad Central de Chile
Publisher: name: Universidad Central de Chile
Year: 2024
Subjects: Interoperabilidad
Repositorio Institucional
Metadatos

description: Declaración de interoperabilidad de metadatos del Repositorio Institucional de la Universidad Central de Chile, en el que se encuentra detallado los esquemas (DataCite, OpenAire y locales) utilizados por el mismo y su equivalencia en Dublin Core para la facilitar el proceso de cosecha de otras plataformas.
Además contempla la descripción de los campos generados de manera local.
Rola marketingu terytorialnego w rozwoju społecznogospodarczym środowisk lokalnych
Creators: name: Deluga, Włodzimierz
name: Deluga, Włodzimierz
Publisher: name: Unknown
Year: 2015
Subjects: subject: Community/Rural/Urban Development
subject: Marketing
subject: FOS: Economics and business
subject: territorial marketing
subject: strategic goals
subject: socio-economic development

description: Undoubtedly territorial marketing (space marketing) has been recently one of the fastest growing areas of marketing theory and practice. We can observe a significant increase in the activity of local authorities and self-governments in the field of space marketing. In the paper the author presents the essence of territorial marketing, emphasizing its evolution and its connection to various sectors of marketing knowledge. Attention has also been drawn to the aims and objectives of territorial marketing in the local environment. To illustrate the discussed issues, the author has indicated the practice of using territorial marketing to accelerate the socio-economic development of local communities.
Photometric Monitoring of Open Clusters I. The Survey
Creators: name: Hebb, Leslie
name: Wyse, Rosemary F. G.
name: Gilmore, Gerard
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Open clusters, which have age, abundance, and extinction information from studies of main-sequence turn off stars, are the ideal location in which to determine the mass-luminosity-radius relation for low-mass stars. We have undertaken a photometric monitoring survey of open clusters in the Galaxy designed to detect low-mass eclipsing binary systems through variations in their relative light curves. Our aim is to provide an improved calibration of the mass-luminosity-radius relation for low-mass stars and brown dwarfs, to test stellar structure and evolution models, and to help quantify the contribution of low-mass stars to the global mass census in the Galaxy. In this paper we present our survey, describing the data and outlining the analysis techniques. We study six nearby open clusters, with a range of ages from $\sim 0.2$ to 4 Gyr and metallicities from approximately solar to -0.2dex. We monitor a field-of-view of > 1 square degree per target cluster, well beyond the characteristic cluster radius, over timescales of hours, days, and months with a sampling rate optimised for the detection of eclipsing binaries with periods of hours to days. Our survey depth is designed to detect eclipse events in a binary with a primary star of $\lesssim 0.3~M_{\sun}$. Our data have a photometric precision of $\sim 3$ mmag at $I\approx 16$.
description: 50 pages, 18 figures, accepted for publication in AJ
Declaración de interoperabilidad de metadatos Repositorio Institucional Universidad Central de Chile
Creators: name: Abedrapo Rosen, Isabel
name: Meneses Jorquera, Antia
Publisher: name: Zenodo
Year: 2023
Subjects: Interoperabilidad
Repositorio Institucional
Metadatos

description: Declaración de interoperabilidad de metadatos del Repositorio Institucional de la Universidad Central de Chile, en el que se encuentra detallado los esquemas (DataCite, OpenAire y locales) utilizados por el mismo y su equivalencia en Dublin Core para la facilitar el proceso de cosecha de otras plataformas.
Stuckelberg SUSY QED and Infrared Problem
Creators: name: Vinze, Radhika
name: Govindarajan, T. R.
name: Misra, Anuradha
name: Ramadevi, P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review gauge invariant $\mathcal N =1$ supersymmetric massive $U(1)$ gauge theory coupled to matter and Stuckelberg superfields. We focus on the leading order self energy and vertex correction to the matter field in the massless limit of both the $U(1)$ vector superfield and the Stuckelberg superfield. We explicitly verify that the theory is infrared divergence free in the massless limit. Hence the Stuckelberg mechanism appears to be the efficient route to handle infrared divergences seen in supersymmetric quantum electrodynamics.Since these additional particles have very small masses they can serve as dark matter candidates through `Ultralight particles' mechanism.
description: 16 pages, 4 figures
title: A study of peer activity in the early years through a range of contextual frameworks
Creators: name: Bibby, Helen
Publisher: name: The Open University
Year: 2012

description: This report focuses on exploring peer activity in the early years through a range of contextual frameworks. The research is conducted within a children's centre that provides nursery education for children aged 3-4 years as defined by the Early Years Foundation Stage - EYFS (2007).

 Research rationale focuses on the notion of, 'reflexive co-construction' through 'sustained shared thinking' (Siraj-Blatchford, 2002, p10). In order to appreciate this concept more fully among peers, it is suggested that a robust pedagogy is required to enhance the practitioner's understanding of peer activity.

 It is argued that context and peer activity are inextricably linked. If we are to consider peer activity, then its relationship with context must be more fully studied and articulated than in previous discussions. From a socio-constructivist standpoint, the study applies four different, but complementary theoretical perspectives to more fully describe and analyse the social realities children encounter on a daily basis. These perspectives are, an ecological understanding of human development, distributed cognition, activity theory and situated action.

 Peer literature in the early years is both varied and confusing in terms of context and outcome. Because of this predicament, it is suggested that there is an opening for studying peer activity from a contextual viewpoint.

 The research applies a qualitative ethnographic and observational approach. Data is generated from documentation, observations of, and discussions with, children and staff and is analysed within the four identified theoretical perspectives. The application of distributed cognition, activity theory and situated action further illuminates how children use a range of strategies to engage with one another. The research argues that such interactions within differing contexts create unique opportunities for reflexive co-construction amongst the children themselves. What emerges from this work is a pedagogical model, relating to peers and 'reflexive co-construction', which provides another dimension to current early years educational documentation.
Growth Kinetics and Aging Phenomena in a Frustrated System
Creators: name: Kumar, Manoj
name: Corberi, Federico
name: Lippiello, Eugenio
name: Puri, Sanjay
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We study numerically the ordering kinetics in a two-dimensional Ising model with random coupling where the fraction of antiferromagnetic links $a$ can be gradually tuned. We show that, upon increasing such fraction, the behavior changes in a radical way. Small $a$ does not prevent the system from a complete ordering, but this occurs in an extremely (logarithmically) slow manner. However, larger values of this parameter destroy complete ordering, due to frustration, and the evolution is comparatively faster (algebraic). Our study shows a precise correspondence between the kind of developing order, ferromagnetic versus frustrated, and the speed of evolution. The aging properties of the system are studied by focusing on the scaling properties of two-time quantities, the autocorrelation and linear response functions. We find that the contribution of equilibrium and an aging part to these functions occurs differently in the various regions of the phase diagram of the model. When quenching inside the ferromagnetic phase, the two-time quantities are obtained by the addition of these parts. Instead, in the paramagnetic phase, these two contributions enter multiplicatively. Both of the scaling forms are shown with excellent accuracy, and the corresponding scaling functions and exponents have been determined and discussed.
The status of arboreta in South Africa and the taxa they contain
Creators: name: Cheek, MD
name: Wilson, JRU
name: Richardson, DM
name: Procheş, Ş
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Pharmacology
subject: Biotechnology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Collections of living trees (hereafter arboreta) are important for conservation, research on species selection for forestry, and as sentinel sites for monitoring pests and diseases. Arboreta can also be the source of propagules for biological invasions. Between 2012 and 2022 a survey was undertaken to assess the status of arboreta in South Africa and the taxa present in such sites, the first such assessment since 1986. At least 172 arboreta have existed in South Africa, but 51 of these are no longer present, with the total number of arboreta peaking around 1980 and declining thereafter. Arboreta have been lost mostly because of conversion of sites to other land-uses, but in some cases because the specimens were felled or burnt down and not replaced. Most of the remaining 121 arboreta are on municipal or forestry land. The biggest challenge facing the extant arboreta is the financial burden of maintaining the collections. The extant arboreta house 2 309 taxa from 158 plant families; of these, 128 taxa (occurring variously in 88 arboreta) are listed as Vulnerable, Endangered, Critically Endangered or Extinct in the Wild under the 2020 IUCN Red List, and 400 taxa (occurring variously in 113 arboreta) have been listed as invasive somewhere in the world. Biogeographic regions that are relatively well represented include the East African Steppe, Sino-Japanese Region, West African Rainforest, North-Eastern Australia, and the Caribbean, making the arboreta valuable sources of germplasm for taxa from these regions. Arboreta are an important resource for South Africa, but a resource that appears to be shrinking. If the value of current arboreta for conservation, education, and research is to be fulfilled, they need to be formally catalogued, their species lists regularly updated, and measures put in place to ensure their sustainability.
Produkcja cydru i perry na uproszczonych zasadach jako źródło dodatkowego dochodu w gospodarstwach sadowniczych
Creators: name: Filipiak, Tadeusz
name: Biernat, Rafał
name: Filipiak, Tadeusz
name: Biernat, Rafał
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: production of cider and perry
subject: investments
subject: sources of agricultural income

description: The paper presents the production of cider and / or perry on a simplified basis as a source of additional income in fruit farm. The study determined the projected capital expenditures, production costs and revenue from the production, as well as the profitability of the new venture. The analysis show that the proposed project has a chance of success and could be a proposal to increase income for households aimed at the fruits production.
Wykorzystanie potencjału produkcyjnego rolnictwa w województwie lubelskim w latach 2010-2013
Creators: name: Gałecka, Agnieszka
name: Gałecka, Agnieszka
Publisher: name: Unknown
Year: 2015
Subjects: subject: Community/Rural/Urban Development
subject: Productivity Analysis
subject: agriculture
subject: productive potential
subject: agricultural output
subject: Lublin province

description: The aim of the study was to present the use of the productive potential of agriculture in Lublin province against the country. The analysis was conducted between 2010 and 2013. It was found that the Lublin province is one of the main centers of agricultural output in Poland, and production capacity in the region is used at a low level. This is mainly due to the fact a large fragmentation of farms, improper structure of agricultural output and agrotechnical level.
Instrumenty wsparcia badań i innowacji w zakresie biogospodarki w Unii Europejskiej
Creators: name: Gołębiewski, Jarosław
name: Gołębiewski, Jarosław
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agricultural and Food Policy
subject: Environmental Economics and Policy
subject: bioeconomy
subject: support
subject: resources

description: The aim of this study is to evaluate instruments to support research and innovation in the bio-economy in the European Union. The paper discusses the instruments available under the Framework Programme for Research and Innovation Horizon 2020. Attention was also drawn to the mechanism of public-private partnership under the name Bio-based Industries Joint Undertaking. According to the results, the total amount of funds for projects aimed at research and innovation in the bio-economy is one of the most important item in the budget of Horizon 2020 - over 15.3 billion euro, representing almost 20% of the total budget, has been allocated to support bioeconomy. The Bio-based Industries Joint Undertaking is supposed to contribute to the development of sustainable, low-carbon economy and increase in economic growth and employment, particularly in rural areas.
Rényi and Tsallis entropies of the Dirichlet and Neumann one-dimensional quantum wells
Creators: name: Olendski, O.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: A comparative analysis of the Dirichlet and Neumann boundary conditions (BCs) of the one-dimensional (1D) quantum well extracts similarities and differences of the Rényi $R(α)$ as well as Tsallis $T(α)$ entropies between these two geometries. It is shown, in particular, that for either BC the dependencies of the Rényi position components on the parameter $α$ are the same for all orbitals but the lowest Neumann one for which the corresponding functional $R$ is not influenced by the variation of $α$. Lower limit $α_{TH}$ of the semi infinite range of the dimensionless Rényi/Tsallis coefficient where {\em momentum} entropies exist crucially depends on the {\em position} BC and is equal to one quarter for the Dirichlet requirement and one half for the Neumann one. At $α$ approaching this critical value, the corresponding momentum functionals do diverge. The gap between the thresholds $α_{TH}$ of the two BCs causes different behavior of the Rényi uncertainty relations as functions of $α$. For both configurations, the lowest-energy level at $α=1/2$ does saturate either type of the entropic inequality thus confirming an earlier surmise about it. It is also conjectured that the threshold $α_{TH}$ of one half is characteristic of any 1D non-Dirichlet system. Other properties are discussed and analyzed from the mathematical and physical points of view.
description: 7 figures
Efekty produkcyjne i ekonomiczne intensywnej i integrowanej technologii produkcji pszenicy ozimej i jęczmienia jarego
Creators: name: Grabiński, Jerzy
name: Grabiński, Jerzy
Publisher: name: Unknown
Year: 2015
Subjects: subject: Productivity Analysis
subject: Research and Development/Tech Change/Emerging Technologies
subject: winter wheat
subject: spring barley
subject: intensive technology
subject: integrated technology
subject: economic evaluation

description: The aim of the study was evaluation of the economic efficiency of the intensive and integrated technology production of winter wheat and spring barley. The base for this were results of the field experiment. The effect of the studies was estimation of direct costs, direct surplus and some economic indicators for technologies production of species taking into consideration in the experiments. Conducted analyses showed that production effects of integrated technologies depended mainly on diversified in years of weather conditions. These technologies can lead for getting yields on the level of intensive technologies, but in years with conditions of the weather, hampering taking the right decisions in reducing the expenditure can cause even the big decreases of the crop and in the end lower than in the intense technology economic effectiveness.
Action of Pseudomonas aeruginosa and Pyocyanin on Lawsonia inermis and Dye Plants.1.pdf
Creators: name: Pelini, Paolo
Publisher: name: figshare
Year: 2020
Subjects: subject: Botany
subject: 60199 Biochemistry and Cell Biology not elsewhere classified
subject: FOS: Biological sciences
subject: 60501 Bacteriology
subject: Microbiology

description: The studies conducted on the phenomena of contamination or of greater bacterial load referred to the microbiota of dye plants, in particular of Lawsonia inermis L. connected to the presence in the extract of Pseudomonas aeruginosa (PA), demonstrate the importance of microbiological control also on cosmetic products herbal.
Reducing qubit requirements while maintaining numerical precision for the Variational Quantum Eigensolver: A Basis-Set-Free Approach
Creators: name: Kottmann, Jakob S.
name: Schleich, Philipp
name: Tamayo-Mendoza, Teresa
name: Aspuru-Guzik, Alán
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a basis-set-free approach to the variational quantum eigensolver using an adaptive representation of the spatial part of molecular wavefunctions. Our approach directly determines system-specific representations of qubit Hamiltonians while fully omitting globally defined basis sets. In this work, we use directly determined pair-natural orbitals on the level of second-order perturbation theory. This results in compact qubit Hamiltonians with high numerical accuracy. We demonstrate initial applications with compact Hamiltonians on up to 20 qubits where conventional representation would for the same systems require 40-100 or more qubits.
The CFT$_6$ origin of all tree-level 4-point correlators in AdS$_3 \times S^3$
Creators: name: Giusto, Stefano
name: Russo, Rodolfo
name: Tyukov, Alexander
name: Wen, Congkao
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We provide strong evidence that all tree-level 4-point holographic correlators in AdS$_3 \times S^3$ are constrained by a hidden 6D conformal symmetry. This property has been discovered in the AdS$_5 \times S^5$ context and noticed in the tensor multiplet subsector of the AdS$_3 \times S^3$ theory. Here we extend it to general AdS$_3 \times S^3$ correlators which contain also the chiral primary operators of spin zero and one that sit in the gravity multiplet. The key observation is that the 6D conformal primary field associated with these operators is not a scalar but a self-dual $3$-form primary. As an example, we focus on the correlators involving two fields in the tensor multiplets and two in the gravity multiplet and show that all such correlators are encoded in a conformal 6D correlator between two scalars and two self-dual $3$-forms, which is determined by three functions of the cross ratios. We fix these three functions by comparing with the results of the simplest correlators derived from an explicit supergravity calculation.
description: 12 pages, no figures; v2: typos corrected, published version
Influence of Agricultural Sector Okonkwo et al_1.pdf
Creators: name: Chukwudi Okonkwo
name: NWAOSUAGWU LEONARD
name: KATE OKONKWO-EMEGHA
Publisher: name: figshare
Year: 2020
Subjects: subject: 140201 Agricultural Economics
subject: FOS: Economics and business

description: This study seeks to investigate the influence of agricultural sector on gross domestic product(GDP) growth in Nigeria from 1981 to 2015. The broad objective of this study is to evaluate theimpact of agricultural sector on gross domestic product growth in Nigeria. The specificobjectives of the study are; to ascertain the effect of crop production on gross domestic productgrowth in Nigeria. To examine the effect of livestock production on gross domestic productgrowth in Nigeria. To assess the effect of fishery production on gross domestic product growth inNigeria. And to determine the effect of forestry production on gross domestic product growth inNigeria. The researcher used secondary source of data in the study because of the nature of thestudy. The results show that agriculture is statistically significant in influencing GDP growth inNigeria. The result does not contradict Uma, Eboh and Obidike (2013) whose study indicated acombined effect of the variables (crop production, livestock production, fishery and forestry) wassignificant. However, the study differed in the individual contributions of crop production,livestock and fishing on GDP growth. In line with expectations crop production and livestockproductions increased especially since 2011, therefore contributing slightly highercomparatively to other year to GDP growth. However, forestry and fishery went contrary toexpectation. It is recommended that government should take advantage of the general positivechange in attitude of Nigerians towards agriculture by building sustainable agribusinessecosystem with private sector active participation. Also, provide supporting infrastructure andcontrol systems to encourage commercial agriculture.