cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: International radioactive waste for long-time disposal
Creators: name: Prosvirova, Yana
Publisher: name: TU Wien
Year: 2018
Subjects: subject: nuclear waste management
subject: deep geological disposal
subject: long-term storage
subject: high-level nuclear waste
subject: nuclear policy

description: This thesis aims to reflect upon a problem of creating an International repository for long-term disposal of high-level radioactive waste. At the moment, there is no solution to the problem of long-term disposal of spent nuclear fuel and highly radioactive waste, although volumes of the latter are rapidly growing. The author of the thesis uses her academic background to tackle the issue from political, socio-economic and technical points of view. Approximately 270 000 tons of spent nuclear fuel have been saved up and its number increases by 12 000 tons annually. The overload of on-site repositories requires prompt measures to replace storage with disposal. The option of managing those waste on the best possible terms, implying finding the safest, most technically advanced and legally proven solution was advised by IAEA in a context of building an International Deep geological repository for High-level waste (HLW) long-term storage. The findings indicate that many countries have already accepted the technology of Deep geological storage for HLW as the most advanced nowadays, from all of the existing HLW management strategies. However, not all of those countries own technical and economic capacities for implementing domestic programmes for HLW Deep geological storage. Moreover, the insecure level of communication with public within some countries, brings mistrust towards the scientifically proven projects and triggers protest and unacceptance, that postpones an acute problem solution for later generations. In this context, the options of reaching international cooperation via building the Deep geological repository for SNF and HLW under the aegis of the IAEA, could bring Member States a big step forward towards a long-term nuclear waste disposal.
JESUS DE NAZARÉ ENTENDIDO COMO UM AGENTE SOCIAL
Creators: name: ROCHA, Maicon Samuel Alves da
Publisher: name: Zenodo
Year: 2024
Subjects: indivíduo, Liberdade, bem-estar

description: A temática discutida neste trabalho buscou abordar a vida do homem Jesus de Nazaré como ser social e transformador de sua realidade, sem uma visão mística e fundamentalista. O ser humano Jesus foi mais aprofundado como exemplo de agente social, este que está a serviço do indivíduo que sofre pela opressão ou por qualquer outro tipo de sofrimento proveniente da má qualidade de vida ou de tratamento. Jesus em seu tempo buscou mudar sua realidade trazendo de forma clara e objetiva outra forma de se pensar o homem e o divino tanto visto que a sociedade judaica não querendo encontrar o divino no homem buscava-o em muitas práticas religiosas que os afastava do verdadeiro bem que era a partilha e o bem-estar de todas as pessoas sem restrições. E Jesus como se mostrou neste trabalho procurou dar através da sua voz e de seu exemplo prático a mudança e a transformação de uma sociedade opressora para uma sociedade acolhedora.
How to Retrain Recommender System? A Sequential Meta-Learning Method
Creators: name: Zhang, Yang
name: Feng, Fuli
name: Wang, Chenxu
name: He, Xiangnan
name: Wang, Meng
name: Li, Yan
name: Zhang, Yongdong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Practical recommender systems need be periodically retrained to refresh the model with new interaction data. To pursue high model fidelity, it is usually desirable to retrain the model on both historical and new data, since it can account for both long-term and short-term user preference. However, a full model retraining could be very time-consuming and memory-costly, especially when the scale of historical data is large. In this work, we study the model retraining mechanism for recommender systems, a topic of high practical values but has been relatively little explored in the research community. Our first belief is that retraining the model on historical data is unnecessary, since the model has been trained on it before. Nevertheless, normal training on new data only may easily cause overfitting and forgetting issues, since the new data is of a smaller scale and contains fewer information on long-term user preference. To address this dilemma, we propose a new training method, aiming to abandon the historical data during retraining through learning to transfer the past training experience. Specifically, we design a neural network-based transfer component, which transforms the old model to a new model that is tailored for future recommendations. To learn the transfer component well, we optimize the "future performance" -- i.e., the recommendation accuracy evaluated in the next time period. Our Sequential Meta-Learning(SML) method offers a general training paradigm that is applicable to any differentiable model. We demonstrate SML on matrix factorization and conduct experiments on two real-world datasets. Empirical results show that SML not only achieves significant speed-up, but also outperforms the full model retraining in recommendation accuracy, validating the effectiveness of our proposals. We release our codes at: https://github.com/zyang1580/SML.
description: Appear in SIGIR 2020
Testing blend scenarios for extrasolar transiting planet candidates. II. -- OGLE-TR-56
Creators: name: Torres, Guillermo
name: Konacki, Maciej
name: Sasselov, Dimitar D.
name: Jha, Saurabh
name: ;
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We re-examine the photometric and spectroscopic evidence available for the star OGLE-TR-56, recently discovered to harbor a giant planet presenting transits and orbiting with a period of 1.21 days. We investigate the possibility that the observational signatures reported might be the result of "blending" with the light of an eclipsing binary along the same line of sight. Using techniques developed earlier we perform fits to the light curve under a variety of blend configurations, subject to all observational constraints, and we infer further properties of these possible blends. We then carry out realistic end-to-end simulations based on those properties in order to quantify the spectral line asymmetries and radial velocity variations expected from such scenarios. We confront these calculations with the observations. The results from these models are clearly inconsistent with the measured radial velocity and bisector span variations, ruling out blends and confirming the planetary nature of the companion. The example of OGLE-TR-56 serves to illustrate the sort of tests that can and should be performed on transiting planet candidates to eliminate the possibility of "false positives", and in particular, line-of-sight contamination from eclipsing binaries.
description: 10 pages including 10 figures and 1 table. To appear in ApJ, January 2005. Minor change in the Introduction, and updates to references
AGRICULTURAL PRICE POLICY, CONSUMER DEMAND AND IMPLICATIONS FOR HOUSEHOLD FOOD SECURITY IN NIGERIA
Creators: name: Akanni, Kassim Adekunle
name: Akanni, Kassim Adekunle
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Food Security and Poverty
subject: Agricultural price policy
subject: consumer demand
subject: foodgrain
subject: food security
subject: Nigeria

description: There is persistent instability of consumer prices for most agricultural commodities in Nigeria. This is occasioned by factors such as season, input price changes, production and marketing technologies and consumer taste, among others. The market price variations often affect the level of consumer demand and food security status of the households. This study therefore examined the synergy between the agricultural commodity prices, consumer demand and food security status of the consuming households in Nigeria. A total of 360 foodgrains consumers were randomly sampled for this study from the 6 geo-political zones in the country. Results indicated that despite the various policies on agricultural prices, the market prices of foodgrains remain unstable. Specifically, the level of consumer demand and satisfaction got reduced while a large proportion of the consumers were food insecure. Major factors that are responsible for unstable consumer demand and household insecurity in the consumption of foodgrains among Nigerians include insufficient household income, increasing household size, consumer preference, market price and lack of standard measurement. With increased discipline in the style of implementation of the various price policies on agricultural commodities, it is hoped that the level of consumer demand and foodgrains security status of Nigerians will improve.
An Efficient Routing Protocol for Secured Communication in Cognitive Radio Sensor Networks
Creators: name: Akter, Sharmin
name: Rahman, Mohammad Shahriar
name: Mansoor, Nafees
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Computers and Society (cs.CY)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: This paper introduces an efficient reactive routing protocol considering the mobility and the reliability of a node in Cognitive Radio Sensor Networks (CRSNs). The proposed protocol accommodates the dynamic behavior of the spectrum availability and selects a stable transmission path from a source node to the destination. Outlined as a weighted graph problem, the proposed protocol measures the weight for an edge the measuring the mobility patterns of the nodes and channel availability. Furthermore, the mobility pattern of a node is defined in the proposed routing protocol from the viewpoint of distance, speed, direction, and node's reliability. Besides, the spectrum awareness in the proposed protocol is measured over the number of shared common channels and the channel quality. It is anticipated that the proposed protocol shows efficient routing performance by selecting stable and secured paths from source to destination. Simulation is carried out to assess the performance of the protocol where it is witnessed that the proposed routing protocol outperforms existing ones.
POTENTIALS OF EGYPT AGRICULTURAL BILATERAL TRADE WITH THE ARAB COUNTRIES: GRAVITY MODEL EVIDENCE
Creators: name: Said, Mohamed Ahmed
name: Shelaby, Ayman Abd-Alkawy
name: Said, Mohamed Ahmed
name: Shelaby, Ayman Abd-Alkawy
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: Egypt agricultural exports
subject: bilateral trade
subject: gravity model
subject: Arab intra-trade

description: The paper aims at evaluating the determinants of agricultural bilateral trade flows of Egypt with the Arab countries. A gravity model has been used in addition to some other indicators such as relative importance of intra-trade, tendency to export and import, and degree of openness. Two models have been estimated; one is for the Egyptian agricultural exports and the other is for the imports. The biggest Arab partners who represent the majority of the Egyptian bilateral trade are; KSA, Syria, Libya, Sudan, Jordan, UAE, Kuwait, Lebanon, and Iraq. The main features of the gravity model have been introduced well. The gross domestic product has a positive impact on both agricultural exports and imports, and the distance between Egypt and the target countries has a negative impact. Both factors are statistically significant. It's recommended that Egypt encourage foreign investment within the agriculture sector and maintain the road transportation with Arab countries.
title: 02_0875
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Continuity between Cauchy and Bolzano: Issues of antecedents and priority
Creators: name: Bair, Jacques
name: Blaszczyk, Piotr
name: Guillen, Elias Fuentes
name: Heinig, Peter
name: Kanovei, Vladimir
name: Katz, Mikhail G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 01A55, 26A15

description: In a paper published in 1970, Grattan-Guinness argued that Cauchy, in his 1821 book Cours d'Analyse, may have plagiarized Bolzano's book Rein analytischer Beweis (RB), first published in 1817. That paper was subsequently discredited in several works, but some of its assumptions still prevail today. In particular, it is usually considered that Cauchy did not develop his notion of the continuity of a function before Bolzano developed his in RB, and that both notions are essentially the same. We argue that both assumptions are incorrect, and that it is implausible that Cauchy's initial insight into that notion, which eventually evolved to an approach using infinitesimals, could have been borrowed from Bolzano's work. Furthermore, we account for Bolzano's interest in that notion and focus on his discussion of a definition by Kästner (in Section 183 of his 1766 book), which the former seems to have misrepresented at least partially. Cauchy's treatment of continuity goes back at least to his 1817 course summaries, refuting a key component of Grattan-Guinness' plagiarism hypothesis (that Cauchy may have lifted continuity from RB after reading it in a Paris library in 1818). We explore antecedents of Cauchy and Bolzano continuity in the writings of Kästner and earlier authors.
description: 23 pages, 5 figures, to appear in British Journal for the History of Mathematics
INTRA-YEAR PRICE INSTABILITY OF COMMERCIAL CROPS IN INDIA: EXPLORING THE UNDERLYING DYNAMISM
Creators: name: Anoopkumar, M.
name: Anoopkumar, M.
Publisher: name: Unknown
Year: 2014
Subjects: subject: Crop Production/Industries
subject: Production Economics
subject: Intra-year instability
subject: seasonality
subject: co-efficient of variation
subject: inter-temporal arbitraging
subject: cyclical fluctuations

description: One serious issue which creates far reaching repercussions in the commercial agriculture sector of India is the heightened instability in price both at the inter-year and intra-year level. An exploration of intra-year price instability, which is rarely addressed in the empirical studies, is attempted in this paper by selecting the case of four major commercial crops of India namely, Small Cardamom, Black Pepper, Natural Rubber and Tea. The study concludes that even in the scenario of integrated market setting price instability at the intra-year level is guided mainly by the seasonal character of supply. Hence, market offers high price to the farmers only when they have less to offer in the market and vice versa, which makes their income unstable in the short run, highlighting the need for stabilizing producers’ returns.
The crystal chemistry of gorceixite, grandidierite, and traskite
Creators: name: Dzikowski, Tashia Jayne
Publisher: name: University of British Columbia
Year: 2010

description: This thesis reinvestigates the crystal structures of gorceixite and traskite, and the geometric effects of vFe²+ for vMg substitution on the crystal structures of the grandidieriteominelite series. All data was measured using using MoKα radiation on an automated Bruker X8 single-crystal diffractometer with a SMART APEX CCD (charge coupled device) detector. The crystal structure of gorcexite (BaA1₃(P0₃0,0H) ₂(OH₆),a, 7.0538(3), c l7.2746(6) , Å V 744.4(2) Å³, space group R 3̄m, Z = 3, has been refined to an R₁ index of 2.3% based on 253 unique reflections. The results indicate that this specimen has rhombohedral rather than monoclinic Cm symmetry as was previously reported for the species. The crystal-structure refinement shows that the atomic arrangement of gorceixite is similar to that of other members of the plumbogummite group. The chemical compositions and crystal structures of seven members of the grandidieriteominelite (MgA1₃BSiO₉--Fe²⁺ A1₃BSiO₉) series with X = (Fe²⁺ + Mn + Zn) (Fe²⁺ + Mn + Zn + Mg) ranging from 0.00 to 0.52 were studied to determine the geometric effects of Fe substitution for Mg on the crystal structures. Regression equations derived from single-crystal X-ray diffraction data show that b increases by 0.18 for the range X = 0-1. The crystal structure refinements show that the most significant changes involve the (Mg,Fe²⁺)O₅ polyhedron, which increases in volume by 0.36 Å³ (5.0%), largely as a result of expansion of the MgFe-05, -02, and -06 (x2) bond distances, which increase by 0.09 (4.4%), 0.06, and 0.04 Å, respectively. Numerous space groups were tried in an attempt to solve and refine the crystal structure of the traskite (Ba₉Fe²⁺₂Ti₂(SiO₃)₁₂(F,C1,OH)₆ 6H₂O.The most successful was P3̄1̕n with a 17.863(3), c 12.298(3) Å, and Z = 3. The Rint = 5.3% and R₁ = 5.3% values indicate that the data are good and that the model is close to being correct; however, split Ba, O, and C1 sites indicate that there are missing symmetry elements within the structure. Attempts to refine the structure in PG/mmm, which contains the supposed missing symmetry elements, were unsuccessful.
Tidal gravitational effects in a satellite
Creators: name: Tourrenc, Philippe
name: Angonin-Willaime, Marie-Christine
name: Ovido, Xavier
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Atomic wave interferometers are tied to a telescope pointing towards a faraway star in a nearly free falling satellite. Such a device is sensitive to the acceleration and the rotation relatively to the local inertial frame and to the tidal gravitational effects too. We calculate the rotation of the telescope due to the aberration and the deflection of the light in the gravitational field of a central mass (the Earth and Jupiter). Within the framework of a general parametrized description of the problem, we discuss the contributions which must be taken into account in order to observe the Lense-Thirring effect. Using a geometrical model, we consider some perturbations to the idealized device and we calculate the corresponding effect on the periodic components of the signal. Some improvements in the knowledge of the gravitational field are still necessary as well as an increase of the experimental capabilities; however our conclusions support a reasonable optimism for the future. Finally we put forward the necessity of a more complete, realistic and powerful model in order to obtain a definitive conclusion on the feasibility of the experiment as far as the observation of the Lense-Thirring effect is involved.
description: accepted to General Relativity and Gravitation
Designmönster om omvänd handledning (Flipped supervision)
Creators: name: Premat, Christophe
Publisher: name: Stockholm University Design Patterns
Year: 2021
Subjects: subject: 130306 Educational Technology and Computing
subject: FOS: Educational sciences
subject: Education

description: Detta är ett designmönster som handlar om "omvänd handledning" med hjälp av lärplattformen Athena (itsLearning) som används på Stockholms universitet. Tanken är att göra det lättare att arbeta med uppföljning och olika versioner av uppsatsen tillsammans med studenten. Samarbetet är inte alltid synkroniserat, men kan underlättas om läraren skapar en sida i Athena där studenterna får ett varsitt sk. "planeringsområde". Det gör att det går lättare att administrera och att både studenten och handledaren kan förbereda sig bättre inför varje möte eller återkopplingstillfälle. Detta förfarande ger också mer tid och struktur för reflektioner om skrivarbetet under tiden uppsatsen växer fram.

This is a design pattern about flipped supervision with the help of itslearning (Athena at Stockholm University). The idea is to facilitate the follow-up, the discussion of the drafts with the student. The exchanges are not always synchronized and it could be good to have a page in itslearning for flipped supervision with a possibility to create a planning for each student registered in the course. The student has a better control on the planning and the sessions with the supervisor are much efficient as he/she has time to reflect on the development of the paper.
Quantum theory of a polarization phase-gate in an atomic tripod configuration
Creators: name: Rebic, S.
name: Vitali, D.
name: Ottaviani, C.
name: Tombesi, P.
name: Artoni, M.
name: Cataliotti, F.
name: Corbalan, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present the quantum theory of a polarization phase-gate that can be realized in a sample of ultracold rubidium atoms driven into a tripod configuration. The main advantages of this scheme are in its relative simplicity and inherent symmetry. It is shown that the conditional phase shifts of order $π$ can be attained.
description: X International Conference on Quantum Optics, Minsk, Belarus
Valence band electronic structure of the van der Waals ferromagnetic insulators: VI$_3$ and CrI$_3$
Creators: name: Kundu, Asish K.
name: Liu, Yu
name: Petrovic, C.
name: Valla, T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Ferromagnetic van der Waals (vdW) insulators are of great scientific interest for their promising applications in spintronics. It has been indicated that in the two materials within this class, CrI$_3$ and VI$_3$, the magnetic ground state, the band gap, and the Fermi level could be manipulated by varying the layer thickness, strain or doping. To understand how these factors impact the properties, a detailed understanding of the electronic structure would be required. However, the experimental studies of the electronic structure of these materials are still very sparse. Here, we present the detailed electronic structure of CrI$_3$ and VI$_3$ measured by angle-resolved photoemission spectroscopy (ARPES). Our results show a band-gap of the order of 1 eV, sharply contrasting some theoretical predictions such as Dirac half-metallicity and metallic phases, indicating that the intra-atomic interaction parameter (U) and spin-orbit coupling (SOC) were not properly accounted for in the calculations. We also find significant differences in the electronic properties of these two materials, in spite of similarities in their crystal structure. In CrI$_3$, the valence band maximum is dominated by the I 5{\it p}, whereas in VI$_3$ it is dominated by the V 3{\it d} derived states. Our results represent valuable input for further improvements in the theoretical modeling of these systems.
description: 8 pages, 4 figures
DETERMINANTS OF AGRICULTURAL LABOUR PARTICIPATION AMONG YOUTHS IN ABIA STATE, NIGERIA
Creators: name: Agwu, Nnanna Mba
name: Nwankwo, Emmanuel Eze
name: Anyanwu, Cynthia Ijeoma
name: Agwu, Nnanna Mba
name: Nwankwo, Emmanuel Eze
name: Anyanwu, Cynthia Ijeoma
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Labor and Human Capital
subject: Agricultural labour
subject: participation
subject: probit
subject: youth

description: The general objective of the study was to determine the factors that influenced youth participation in agricultural labour in Abia state, Nigeria. The specific objectives were to; identify the types and composition of farm labour engaged by the respondents in the study area, determine the factors that influence participation of the youths in agricultural labour; and make recommendations based on the findings. This study employed a multi-stage sampling technique in the selection of the respondents; where 4 local government areas (LGAs) were selected from each of the agricultural zone, 10 communities randomly selected from each of these local government areas and finally, 10 youth farmers were chosen from the 10 communities. In all, a total number of 100 farmers were used for the study. The source of data was primary and so used questionnaire to solicit information from the respondents. Descriptive statistics and probit model were employed in the analysis of the data. Apart from bush clearing and mound making where males participated majorly, female’s percentage in the participation of all other farm operations outnumbered those of men. Estimates of the determinants of agricultural labour participation among youths in the study area showed that the coefficients of education of the respondents, income from non- agricultural sources, occupation of the parents, education of the father, farm size and the rate of mechanization influenced agricultural labour participation among the youths in Abia State, Nigeria. Apart from the coefficient of farm size that had a positive sign, the other variables had negative relationship. The study recommended that the cost of mechanization should be made affordable amongst other things to attract youths in agricultural participation.
The Loyalty Islands and Ridge, New Caledonia
Creators: name: P. Maurizot
name: J. Collot
name: D. Cluzel
name: M. Patriat
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Micropalaeontological determinations.
Quasi two-dimensional magnetism in spin-$\frac{1}{2}$ square lattice compound Cu[C$_6$H$_2$(COO)$_4$][H$_3$N-(CH$_2$)$_2$-NH$_3$]$\cdot$3H$_2$O
Creators: name: Guchhait, S.
name: Baby, S.
name: Padmanabhan, M.
name: Medhi, A.
name: Nath, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the crystal growth and structural and magnetic properties of quasi two-dimensional $S=1/2$ quantum magnet Cu[C$_6$H$_2$(COO)$_4$][H$_3$N-(CH$_2$)$_2$-NH$_3$]$\cdot$3H$_2$O. It is found to crystallize in a monoclinic structure with space group $C2/m$. The CuO$_4$ plaquettes are connected into a two-dimensional framework in the $ab$-plane through the anions of [C$_6$H$_2$(COO)$_4$]$^{4-}$ (pyromellitic acid). The [H$_3$N-(CH$_2$)$_2$-NH$_3$]$^{2+}$$\cdot$3H$_2$O groups are located between the layers and provide a weak interlayer connection via hydrogen (H...O) bonds. The temperature dependent magnetic susceptibility is well described by $S=1/2$ frustrated square lattice ($J_1-J_2$) model with nearest-neighbor interaction $J_1/k_{\rm B} \simeq 5.35$ K and next-nearest-neighbor interaction $J_2/k_{\rm B} \simeq -0.01$ K. Even, our analysis using frustrated rectangular lattice ($J_{1a,b}-J_2$) model confirms almost isotropic nearest-neighbour interactions ($J_{\rm 1a}/k_{\rm B} \simeq 5.31$ K and $J_{\rm 1b}/k_{\rm B} \simeq 5.38$ K) in the $ab$-plane and $J_2/k_{\rm B}\simeq-0.24$ K. Further, the isothermal magnetization at $T=1.9$ K is also well described by a non-frustrated square lattice model with $J_1/k_{\rm B} \simeq 5.2$ K. Based on the $J_2/J_1$ ratio, the compound can be placed in the Néel antiferromagnetic state of the $J_1 - J_2$ phase diagram. No signature of magnetic long-range-order was detected down to 2 K.
description: 8 pages, 4 figures, 3 tables
A Photometric Technique to Search for Be Stars in Open Clusters
Creators: name: McSwain, M. Virginia
name: Gies, Douglas R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe a technique to identify Be stars in open clusters using Stromgren b, y, and narrow-band Halpha photometry. We first identify the B-type stars of the cluster using a theoretical isochrone fit to the (b-y, y) color-magnitude diagram. The strongest Be stars are easily identified in a (b-y, y-Halpha) color-color diagram, but those with weaker Halpha emission (classified as possible Be star detections) may be confused with evolved or foreground stars. Here we present such photometry plus Halpha spectroscopy of members of the cluster NGC 3766 to demonstrate the accuracy of our technique. Statistical results on the relative numbers of Be and B-type stars in additional clusters will be presented in a future paper.
description: 15 pages, 6 figures, 1 table. Accepted by ApJ
Unveiling the polarity of the spin-to-charge current conversion in $Bi_2Se_3$
Creators: name: Mendes, J. B. S.
name: Gamino, M.
name: Cunha, R. O.
name: Abrão, J. E.
name: Rezende, S. M.
name: Azevedo, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report an investigation of the spin- to charge-current conversion in sputter-deposited films of topological insulator $Bi_2Se_{3}$ onto single crystalline layers of YIG $(Y_{3}Fe_{5}O_{12})$ and polycrystalline films of Permalloy $(Py = Ni_{81}Fe_{19})$. Pure spin current was injected into the $Bi_{2}Se_{3}$ layer by means of the spin pumping process in which the spin precession is obtained by exciting the ferromagnetic resonance of the ferromagnetic film. The spin-current to charge-current conversion, occurring at the $Bi_{2}Se_{3}/$ferromagnet interface, was attribute to the inverse Rashba-Edelstein effect (IREE). By analyzing the data as a function of the $Bi_{2}Se_{3}$ thickness we calculated the IREE length used to characterize the efficiency of the conversion process and found that 1.2 pm $\leq|λ_{IREE}|\leq$ 2.2 pm. These results support the fact that the surface states of $Bi_{2}Se_{3}$ have a dominant role in the spin-charge conversion process, and the mechanism based on the spin diffusion process plays a secondary role. We also discovered that the spin- to charge-current mechanism in $Bi_{2}Se_{3}$ has the same polarity as the one in Ta, which is the opposite to the one in Pt. The combination of the magnetic properties of YIG and Py, with strong spin-orbit coupling and dissipationless surface states topologically protected of $Bi_{2}Se_{3}$ might lead to spintronic devices with fast and efficient spin-charge conversion.
The role of tidal fluctuations in influencing rates of submarine groundwater discharge
Creators: name: Safadi, Catherine Helen
Publisher: name: University of British Columbia
Year: 2010

description: The following work was undertaken in this study to provide insight about the role of tidal fluctuations in influencing rates of SGD: (1) Improvements were made to the installation method and accuracy of a new tool developed for measuring the transient changes in vertical differential fluid pressures, referred to as the differential pressure system (DPS-II), (2) a field experiment was carried out to obtain measurements of SGD rates by a continuous heat type seepage meter, transient changes in vertical differential fluid pressures heads in shallow sediment by the DPS-II and tidal fluctuations in the near-shore environment, (3) the interpretation of the field data sets were constrained based on calculations using Darcy’s Law and a 1D uniform density flow model. The field experiment was carried out between October 26-28 2005, which was the last of a sequence of nine shorter tests completed to refine field procedures and gain experience using the instruments. Spanish Banks West beach in Vancouver was chosen as the field site because it is close proximity to The University of British Columbia, reasonable rates of SGD were measured during preliminary tests and the location fulfilled many of the logistical demands of testing. Results of the experiment showed that the highest differential fluid pressure heads (measured between about 0.3 and 0.6 m below the seabed) at two piezometers of the DPS-II and highest SGD rates occurred at low tide. Using ii Darcy’s Law, SGD rates were calculated based on the differential fluid pressure heads and a hydraulic conductivity value within the constraints of the hydraulic conductivity data set derived from falling head tests completed on core samples from the site. The calculated SGD rates provided a good match with SGD rates by the seepage meter. Results of the 1D hydrogeological modelling suggest that the field based measurements of differential fluid pressure heads and SGD rates can be explained reasonably well by a 1D uniform density dependent flow model.
TREND EVALUATION OF AGRICULTURAL EXPORT CROPS IN NIGERIA
Creators: name: Akpaeti, Aniekan Jim
name: Bassey, Nsikan Edet
name: Okon, Uwemedimo Eyo
name: Akpaeti, Aniekan Jim
name: Bassey, Nsikan Edet
name: Okon, Uwemedimo Eyo
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: International Relations/Trade
subject: Agricultural export crops
subject: growth rates
subject: trend

description: The study uses the Ordinary Least Square (OLS) regression technique to evaluate the growth rates of three agricultural export crops (cocoa, palm kernel and palm oil) in Nigeria between1970-2009. The result reveals that growth rates in export of these crops are higher in the financial sector reform period than in the pre-financial sector reform period except in palm kernel and are statistically significant at 5% probability level. This therefore suggests the need to enhance the production of these crops through provision of basic farm inputs, extension, proper financing as well as pursue policies that will encourage exportation and discourage the importation of these crops as the way out.
Articulações entre a valorização seletiva no processo de musealização e a investigação arqueológica: traçando aplicações
Creators: name: Núcleo Multidimensional De Gestão Do Patrimônio E De Documentação Em Museus (NUGEP) Universidade Federal Do Estado Do Rio De Janeiro (UNIRIO)
name: Ballardo, Luciana Messeder
name: Luiz C. Borges
name: Mendonça, Elizabete De Castro
Publisher: name: figshare
Year: 2020
Subjects: subject: Museology
subject: 210204 Museum Studies
subject: FOS: Media and communications

description: Esta investigação parte da pesquisa de doutorado denominada “Gestão de coleções arqueológicas musealizadas: dos métodos de campo à documentação
museológica” vinculada ao Programa de Pós-Graduação em Museologia e Patrimônio da Universidade Federal do Estado do Rio de Janeiro (PPGMUS-UNIRIO) e do pressuposto de que articulações entre a valorização seletiva e os métodos investigação arqueológica podem colaborar no processo de musealização do patrimônio arqueológico. Esta proposição entabula as reflexões sobre como conceitos relacionados à valorização, aderência e ressonância podem contribuir no direcionamento dos processos de musealização, considerando suas justificativas e objetivos ao analisar os aspectos relacionados à remoção de artefatos, à coleta de amostras de solos e outros vestígios. Tudo isso ponderando que o patrimônio arqueológico não está restrito aos artefatos recolhidos no sítio arqueológico, tampouco somente às evidências físicas, mas também ao contexto de inserção desses registros materiais e suas relações com aqueles que os produziram, com o objetivo de discutir um estreitamento entre procedimentos museológicos, como a musealização e as investigações arqueológicas. A abordagem se estabelece nos fundamentos gerais dos métodos de investigação arqueológica direcionados para a análise de alguns conceitos ligados ao processo de musealização, buscando a identificação do patrimônio enquanto valor, vinculando-o aos aspectos ligados à memória, conhecimento e assimilação.
Referência eletrônica do artigo:
BALLARDO, Luciana Oliveira Messeder; BORGES, Luiz C.; MENDONÇA, Elizabete de Castro. Articulações entre a valorização seletiva no processo de musealização e a investigação arqueológica: traçando aplicações. In: Encontro de Estudos Multidisciplinares em Cultura, n. XV, Salvador. Anais do XV Enecult. Salvador: Universidade Federal da Bahia, 2019, v.1, p. 1-12. ISSN 2318-4035. Disponível em: . Acesso em: [inserir data de consulta].DOI: 10.6084/m9.figshare.12328481
Electrical Tuning of Phase Change Antennas and Metasurfaces
Creators: name: Wang, Yifei
name: Landreman, Patrick
name: Schoen, David
name: Okabe, Kye
name: Marshall, Ann
name: Celano, Umberto
name: Wong, H. -S. Philip
name: Park, Junghyun
name: Brongersma, Mark L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The success of semiconductor electronics is built on the creation of compact, low-power switching elements that offer routing, logic, and memory functions. The availability of nanoscale optical switches could have a similarly transformative impact on the development of dynamic and programmable metasurfaces, optical neural networks, and quantum information processing. Phase change materials are uniquely suited to enable their creation as they offer high-speed electrical switching between amorphous and crystalline states with notably different optical properties. Their high refractive index has also been harnessed to fashion them into compact optical antennas. Here, we take the next important step by realizing electrically-switchable phase change antennas and metasurfaces that offer strong, reversible, non-volatile, multi-phase switching and spectral tuning of light scattering in the visible and near-infrared spectral ranges. Their successful implementation relies on a careful joint thermal and optical optimization of the antenna elements that comprise an Ag strip that simultaneously serves as a plasmonic resonator and a miniature heating stage.
description: 14 pages, 4 figures
COMPARING THE PROFITABILITY OF BAKAR AND OTHER VARIETIES OF WHEAT IN DISTRICT CHARSADDA
Creators: name: Afridid, Javed Habib
name: Sajjad, Muhammad
name: Ali, Shahid
name: Nazir, Muhammad
name: Bacha, Nafees
name: Afridid, Javed Habib
name: Sajjad, Muhammad
name: Ali, Shahid
name: Nazir, Muhammad
name: Bacha, Nafees
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: Production Economics
subject: Productivity Analysis
subject: Profitability
subject: wheat verities
subject: ordinary least square
subject: analysis

description: This study was conducted to estimate the profitability of different varieties of wheat in two villages of District Charsadda, Khyber Pakhtunkhwa Province of Pakistan. A total of 100 respondents were interviewed to collect the data on cost and revenue in the target area. 27.2 percent of the area was under wheat cultivation. 38 percent of the respondents were literate while about 52 percent of the wheat growers were owners. Owner cum tenants and tenants were 15 and 33 percent respectively. Simple budgeting technique was used for estimation. The overall total cost of wheat production was Rs. 20760.2 per acre, while for Bakar variety and other varieties total cost of production were , Rs. 21856 and Rs. 22309 per acre respectively. The overall net return was Rs. 13447.3 per acre; while from Baker variety and other varieties net return were Rs. 11825 and Rs. 12425 per acre respectively. OLS estimation technique was used to analyze contribution of major factors in the wheat yield. The sings of the explanatory variables were found according to our prior expectation of the economic theory. The estimated results of yield function indicated that seed rate, FYM (Farm Yard Manure), NPK (Nitrogen, Phospouras and Potassium) and labor days have positive and significant effect on wheat yield, while number of tractor hours and educational level of the growers have positive but statistically insignificant effect. Finally, it is suggested that extension personal should transfer latest technology and diseases free seeds of wheat to the farmer’s for optimum yield.
Experimental search for evidence of the three-nucleon force and a new analysis method
Creators: name: Engblom, P. Thorngren
name: Meyer, H. O.
name: von Przewoski, B.
name: Kuros-Zolnierczuk, J.
name: Whitaker, T. J.
name: Doskow, J.
name: Lorentz, B.
name: Pancella, P. V.
name: Pollock, R. E.
name: Rathmann, F.
name: Rinckel, T.
name: Wise, T.
name: Witala, H.
name: Golak, J.
name: Kamada, H.
name: Nogga, A.
name: Skibinski, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A research program with the aim of investigating the spin dependence of the three-nucleon continuum in pd collisions at intermediate energies was carried out at IUCF using the Polarized INternal Target EXperiments (PINTEX) facility. In the elastic scattering experiment at 135 and 200 MeV proton beam energies a total of 15 independent spin observables were obtained. The breakup experiment was done with a vector and tensor polarized deuteron beam of 270 MeV and an internal polarized hydrogen gas target. We developed a novel technique for the analysis of the breakup observables, the sampling method. The new approach takes into account acceptance and non-uniformities of detection efficiencies and is suitable for any kinematically complete experiment with three particles in the final state.
description: Contribution to the 19th European Few-Body Conference, Groningen Aug. 23-27, 2004
LGNN: A Context-aware Line Segment Detector
Creators: name: Meng, Quan
name: Zhang, Jiakai
name: Hu, Qiang
name: He, Xuming
name: Yu, Jingyi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We present a novel real-time line segment detection scheme called Line Graph Neural Network (LGNN). Existing approaches require a computationally expensive verification or postprocessing step. Our LGNN employs a deep convolutional neural network (DCNN) for proposing line segment directly, with a graph neural network (GNN) module for reasoning their connectivities. Specifically, LGNN exploits a new quadruplet representation for each line segment where the GNN module takes the predicted candidates as vertexes and constructs a sparse graph to enforce structural context. Compared with the state-of-the-art, LGNN achieves near real-time performance without compromising accuracy. LGNN further enables time-sensitive 3D applications. When a 3D point cloud is accessible, we present a multi-modal line segment classification technique for extracting a 3D wireframe of the environment robustly and efficiently.
description: 9 pages, 7 figures
A comprehensive treatment of electromagnetic interactions and the three-body spectator equations
Creators: name: Adam,, J.
name: Van Orden, J. W.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a general derivation the three-body spectator (Gross) equations and the corresponding electromagnetic currents. As in previous paper on two-body systems, the wave equations and currents are derived from those for Bethe-Salpeter equation with the help of algebraic method using a concise matrix notation. The three-body interactions and currents introduced by the transition to the spectator approach are isolated and the matrix elements of the e.m. current are presented in detail for system of three indistinguishable particles, namely for elastic scattering and for two and three body break-up. The general expressions are reduced to the one-boson-exchange approximation to make contact with previous work. The method is general in that it does not rely on introduction of the electromagnetic interaction with the help of the minimal replacement. It would therefore work also for other external fields.
BRENDA: Browser Extension for Fake News Detection
Creators: name: Botnevik, Bjarte
name: Sakariassen, Eirik
name: Setty, Vinay
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.7

description: Misinformation such as fake news has drawn a lot of attention in recent years. It has serious consequences on society, politics and economy. This has lead to a rise of manually fact-checking websites such as Snopes and Politifact. However, the scale of misinformation limits their ability for verification. In this demonstration, we propose BRENDA a browser extension which can be used to automate the entire process of credibility assessments of false claims. Behind the scenes BRENDA uses a tested deep neural network architecture to automatically identify fact check worthy claims and classifies as well as presents the result along with evidence to the user. Since BRENDA is a browser extension, it facilities fast automated fact checking for the end user without having to leave the Webpage.
description: Accepted as SIGIR demo
DESARROLLO EN EL MERCADO DE LA CARNE DE POLLO EN SEIS ESTADOS PRODUCTORES DE MÉXICO
Creators: name: Alvarado Lagunas, Elías
name: Moreno Murrieta, Ramsés Everardo
name: Sánchez Rodríguez, Jesús Sergio
name: Alvarado Lagunas, Elías
name: Moreno Murrieta, Ramsés Everardo
name: Sánchez Rodríguez, Jesús Sergio
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Development
subject: Single Price
subject: Panel Data
subject: Poultry Production
subject: Market.

description: In this research it is studied the poultry industry market focusing mainly in the product of chicken meat. The purpose of this paper is to show if there is a development in the sense of Sen for participants in the market for chicken meat in six major producing states of Mexico: Aguascalientes, Coahuila, Durango, Jalisco, Nuevo Leon and Queretaro. To do this, it is estimated a panel data econometric model to determine the characteristics of this market. Among the main findings is that producers are price takers, characteristic of a competitive market where development is given to producers and consumers