cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Farmers’ Social Expenditures and Agricultural Productivity A state variables approach
Creators: name: Ulimwengu, J.
name: Makombe, T.
name: Ulimwengu, J.
name: Makombe, T.
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy
Farm Management

description: With increasingly large shares of public expenditures going toward social sectors in agriculture-based economies, the issue becomes how to design a budget allocation scheme that maximizes agricultural productivity-enhancing effects of social expenditures. This study examines the impact of various subtypes of household health spending on agricultural labor productivity using data from 505 households in five Rwandan districts. Our findings confirm that change in agricultural productivity can be driven by change in marginal productivity of inputs induced by households’ health status. The latter are significantly impacted by households’ own social expenditures. This then suggests that there is a way to bundle social expenditures in order to compensate for the shortage of resources allocated to agriculture and therefore to harness their productivity-enhancing potential.
Review on novel methods for lattice gauge theories
Creators: name: Bañuls, Mari Carmen
name: Cichy, Krzysztof
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Formulating gauge theories on a lattice offers a genuinely non-perturbative way of studying quantum field theories, and has led to impressive achievements. In particular, it significantly deepened our understanding of quantum chromodynamics. Yet, some very relevant problems remain inherently challenging, such as real time evolution, or the presence of a chemical potential, cases in which Monte Carlo simulations are hindered by a sign problem. In the last few years, a number of possible alternatives have been put forward, based on quantum information ideas, which could potentially open the access to areas of research that have so far eluded more standard methods. They include tensor network calculations, quantum simulations with different physical platforms and quantum computations, and constitute nowadays a vibrant research area. Experts from different fields, including experimental and theoretical high energy physics, condensed matter, and quantum information, are turning their attention to these interdisciplinary possibilities, and driving the progress of the field. The aim of this article is to review the status and perspectives of these new avenues for the exploration of lattice gauge theories.
description: 28 pages (including 15 figures) plus bibliography. Comments are most welcome
Quantum critical behavior of the one-dimensional ionic Hubbard model
Creators: name: Manmana, S. R.
name: Meden, V.
name: Noack, R. M.
name: Schoenhammer, K.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the zero-temperature phase diagram of the half-filled one-dimensional ionic Hubbard model. This model is governed by the interplay of the on-site Coulomb repulsion and an alternating one-particle potential. Various many-body energy gaps, the charge-density-wave and bond-order parameters, the electric as well as the bond-order susceptibilities, and the density-density correlation function are calculated using the density-matrix renormalization group method. In order to obtain a comprehensive picture, we investigate systems with open as well as periodic boundary conditions and study the physical properties in different sectors of the phase diagram. A careful finite-size scaling analysis leads to results which give strong evidence in favor of a scenario with two quantum critical points and an intermediate spontaneously dimerized phase. Our results indicate that the phase transitions are continuous. Using a scaling ansatz we are able to read off critical exponents at the first critical point. In contrast to a bosonization approach, we do not find Ising critical exponents. We show that the low-energy physics of the strong coupling phase can only partly be understood in terms of the strong coupling behavior of the ordinary Hubbard model.
description: 18 pages, 16 figures, submitted to Phys. Rev. B
Spatio-temporal oscillations and rheochaos in a simple model of shear banding
Creators: name: Fielding, Suzanne
name: Olmsted, Peter
Publisher: name: arXiv
Year: 2003
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study a simple model of shear banding in which the flow-induced phase is destabilised by coupling between flow and microstructure (wormlike micellar length). By varying the strength of the instability and the applied shear rate, we find a rich variety of oscillatory and rheochaotic shear banded flows. At low shear and weak instability, the induced phase pulsates in width next to one wall of the flow cell. For stronger instability, single or multiple high shear pulses ricochet across the cell. At high shear rates we observe oscillating bands on either side of a defect. In some cases, multiple such defects exist and propagate across the cell to interact with each other. We discuss our results in the context of recent observations of oscillating and fluctuating shear banded flows.
ELEMENTOS BÁSICOS PARA A ORGANIZAÇÃO DE BIBLIOTECAS ESCOLARES
Creators: name: BAD, Cadernos
Publisher: name: Cadernos BAD
Year: 1972

description: Orientações gerais para a organização duma biblioteca escolar liceal; orientações sucintas e acessíveis de modo a poderem ser utilizadas directamente pelos seus encarregados. Considera-se primeiro o problema da implantação e da equipa responsável, passando-se, em nova secção, aos problemas das leitura, atracção de leitores e actividades complementares. Os aspectos técnicos, com os seus circuitos marcados, sao apresentados em duas secções, correspondendo respectivamente a livros e a publicações periódicas.
description: Cadernos BAD, N.º 3-4 (1972)
Topological String Partition Functions as Polynomials
Creators: name: Yamaguchi, Satoshi
name: Yau, Shing-Tung
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We investigate the structure of the higher genus topological string amplitudes on the quintic hypersurface. It is shown that the partition functions of the higher genus than one can be expressed as polynomials of five generators. We also compute the explicit polynomial forms of the partition functions for genus 2, 3, and 4. Moreover, some coefficients are written down for all genus.
description: 22 pages, 6 figures. v2:typos corrected
ARHGEF10L expression regulates cell proliferation and migration in gastric tumorigenesis
Creators: name: Wang, Da-Wei
name: Tang, Jun-Yi
name: Zhang, Guo-Qing
name: Chang, Xiao-Tian
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: We recently reported that Rho guanine nucleotide exchange factor 10-like protein (ARHGEF10L) activated Rho GTPases as guanine nucleotide exchange factor to stimulate liver tumorigenesis. The present study continued to explore the effect of ARHGEF10L on the tumorigenic process of gastric cancer. This study detected increased expression of ARHGEF10L in GC tissues compared to peritumoral tissue samples. SGC7901 cells with ARHGEF10L overexpression showed increased cell proliferation, cell migration, and tube-like structure formation abilities, as well as increased expression of GTP-RhoA, ROCK1, and phospho-Ezrin/Radixin/Moesin. ARHGEF10L overexpression downregulated the expression of E-cadherin and upregulated the expression of N-cadherin and Slug, indicating an activation of EMT in the transfected cells. RNA-sequencing assay detected an increased expression of Heat shock 70 kDa protein 6 in the SGC7901 cells overexpressing ARHGEF10L. The above results suggest that ARHGEF10L expression can stimulate gastric tumorigenesis by prompting RhoA-ROCK1-phospho-ERM signaling, inducing EMT and increasing HSPA6 expression. High expression of ARHGEF10L in gastric tumor stimulated tumor cell proliferation and migration by activating GTP-RhoA-ROCK1-phospho-ERM signaling and inducing EMT. ARHGEF10L: rho guanine nucleotide exchange factor 10-Like1; ERM: Ezrin/Radixin/Moesin; EMT: epithelial–mesenchymal transition; GC: gastric cancer; HSPA6: Heat shock 70 kDa protein 6; RhoA: Ras homolog gene family member A; RhoGEFs: Rho family guanine nucleotide exchange factors; ROCK1: Rho-associated coiled-coil kinase-1
Self-trapped dynamics of a hollow Gaussian beam in metamaterials
Creators: name: Ali, A. K. Shafeeque
name: Lakshmanan, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a systematic investigation on the dynamics of a hollow Gaussian beam (HGB) in metamaterials. We predict self-trapped propagation of HGBs and evolution of the beam is highly influenced by dimensionless dispersion coefficient (k), which determines the strength of dispersion over diffraction. The evolutions of HGBs such as disappearance of single ringed intensity pattern and appearance of patterns with a central bright spot are achievable with less propagation distance in metamaterials with higher values of k. On the other hand, metamaterials with low values of k can preserve single ring intensity distribution over a long propagation distance without focusing. When the strength of dispersion over diffraction increases, it significantly influences the evolution of the beam and may lead to the formation of tightly focussed beam with high peak intensity at the center. The phenomenon of tight focussing is found to have some applications in trapping of nanosized particles.
description: Paper has been accepted for publication in Physics Letters A
Epitedia stewarti Hubbard 1940
Creators: name: Morrone, Juan J.
name: Acosta, Roxana
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Siphonaptera
Hystrichopsyllidae
Epitedia
Epitedia stewarti

description: E. stewarti Hubbard, 1940
Epitedia stewarti Hubbard, 1940: 11.
Distribution. USA.
Hosts. Sorex pacificus and S. trowbridgii. Other hosts. Rodentia: Microtus c. californicus, Microtus sp., and Peromyscus maniculatus (Hopkins & Rothschild, 1962; Carraway, 1985).
description: Published as part of Morrone, Juan J. & Acosta, Roxana, 2006, A synopsis of the fleas (Insecta: Siphonaptera) parasitizing New World species of Soricidae (Mammalia: Insectivora), pp. 1-30 in Zootaxa 1354 on page 18, DOI: 10.5281/zenodo.273605
AS REUNIÕES DA IFLA E DA FID EM BUDAPESTE DE 26 DE AGOSTO A 14 DE SETEMBRO DE 1972
Creators: name: Peixoto, Jorge
Publisher: name: Cadernos BAD
Year: 1972

description: Apresentam-se os principais tópicos recolhidos nas sessões de trabalho do 38.° Conselho Geral da IFLA e da 36.º Conferência e Congresso Internacional da FID, realizados em Budapeste de 26 de Agosto a 14 de Setembro de 1972, dando-se noticia dos trabalhos, conclusões, focando em especial os aspectos da Administração e da catalogação aí versados.
description: Cadernos BAD, N.º 3-4 (1972)
Estimating dynamic stochastic decision models: explore the generalized maximum entropy alternative
Creators: name: Zheng, Y.
name: Gohin, A.
name: Zheng, Y.
name: Gohin, A.
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy

description: This paper proposes a generalized maximum entropy (GME) approach to estimate nonlinear dynamic stochastic decision models. For these models, the state variables are latent and a solution process is required to obtain the state space representation. To our knowledge, this method has not been used to estimate dynamic stochastic general equilibrium (DSGE) or DSGE-like models. Based on the Monte Carlo experiments with simulated data, we show that the GME approach yields precise estimation for the unknown structural parameters and the structural shocks. In particular, the preference parameter which captures the risk preference and the intertemporal preference is also relatively precisely estimated. Compare to the more widely used filtering methods, the GME approach provides a similar accuracy level but much higher computational efficiency for nonlinear models. Moreover, the proposed approach shows favorable properties for small sample size data.
Participation in formal and informal cooperation and its effect on productivity in Central Asia: Empirical evidence from Uzbekistan
Creators: name: Bobjonov, I.
name: Teuber, R.
name: Bobjonov, I.
name: Teuber, R.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Agricultural and Food Policy
subject: International Development
subject: agricultural cooperatives
subject: collective action
subject: Central Asia
subject: Uzbekistan
subject: wheat productivity

description: This study discusses the importance of cooperation in Central Asian Uzbekistan. Determinants of cooperation as well as benefits from cooperation are investigated using survey data of 405 farms in the central grain producing region of Uzbekistan. The study distinguishes between formal and informal cooperation which could have vital importance in transition economies, which is not explicitly discussed in the existing literature so far. The analysis of the determinants shows that participation in cotton procurement mechanisms is the main factor which brings farmers to membership in formal cooperatives. Informal cooperation seems to be more pronounced among middle-scale and commercially-oriented farmers than among large-scale or subsistence-oriented household farms. Larger demand for informal cooperation than formal cooperation is explained by limited type of services in formal cooperatives designed to serve cotton producers. Therefore formal cooperatives need to diversify their services to cover wider demand currently fulfilled by informal cooperation. Besides, our results indicate that participation in both formal and informal cooperatives has a positive effect on wheat productivity. This positive impact of cooperation might stem from improved access to machinery, proper timing and increased input quality.
Epitedia wenmanni Rothschild 1904
Creators: name: Morrone, Juan J.
name: Acosta, Roxana
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Siphonaptera
Hystrichopsyllidae
Epitedia
Epitedia wenmanni

description: E. wenmanni (Rothschild, 1904)
Ctenophthalmus wenmanni Rothschild, 1904: 642. Neopsylla wenmanni; Rothschild, 1915a: 30. Neopsylla testor Rothschild, 1915b: 34.
Neopsylla similis Chapin, 1919: 50.
Epitedia wenmanni; I. Fox, 1940: 96.
Epitedia testor; I. Fox, 1940a: 99.
Neopsylla wenmanni testor; Hopkins, 1954: 217. Epitedia wenmanni wenmanni; Hopkins, 1954: 217.
Distribution. Canada, USA, and Mexico.
Hosts. Blarina brevicauda, Cryptotis parva, Sorex cinereus, and S. fumeus. Other hosts. Carnivora: Mustela erminea, M. frenata, and Mustela sp. Insectivora (Talpidae): Condylura cristata and Parascalops breweri. Rodentia: Clethrionomys gapperi, C. g. proteus, Dipodomys ordii, Glaucomys volans, Lemmiscus curtatus, Microtus chrotorrhinus, M. mexicanus subsimus, M. ochrogaster, M. pennsylvanicus, M. p. minor, Microtus sp., Mus musculus, Napaeozapus insignis, Neotoma cinerea, N. floridana, N. f. osagensis, Onychomys leucogaster, Peromyscus difficilis, P. leucopus, P. l. noveboracensis, P. maniculatus, P. m. gambeli, P. melanotis, Peromyscus sp., Rattus sp., Spermophilus r. richardsoni, Tamiasciurus douglasii, T. hudsonicus, and Thomomys talpoides quadratus (Jellison et al., 1942; Holland, 1949; Rapp Jr. & Gates, 1957; Wilson, 1957; Hopkins & Rothschild, 1962; Whitaker, 1974; Benton & Kelly, 1975; Benton, 1980; Owen, 1984; Morales & Llorente, 1986; Ayala­Barajas et al., 1988; Durden & Wilson, 1991; Whitaker, 2004).
description: Published as part of Morrone, Juan J. & Acosta, Roxana, 2006, A synopsis of the fleas (Insecta: Siphonaptera) parasitizing New World species of Soricidae (Mammalia: Insectivora), pp. 1-30 in Zootaxa 1354 on page 18, DOI: 10.5281/zenodo.273605
Puerarin inhibits the migration of osteoclast precursors and osteoclastogenesis by inhibiting MCP-1 production
Creators: name: Sanfu Lin
name: Dianshan Ke
name: Yinquan Lin
name: Xiaomin Fu
name: Yunlong Yu
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Developmental Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Puerarin inhibits osteoclastogenesis and cells migration. This study aims to explore whether puerarin prevents osteoclastogenesis by inhibiting osteoclast precursors (OCPs) migration. The results showed that puerarin reduced MCP-1 production in OCPs, while inhibiting OCPs migration based on MCP-1. Puerarin reversed MCP-1-promoted osteoclastogenesis. CCR2 overexpression didn’t increase osteoclastogenesis with puerarin. Therefore, puerarin prevents OCPs migration by reducing MCP-1, whereby inhibiting osteoclastogenesis.
Merging Galaxies in the SDSS EDR
Creators: name: Allam, S. S.
name: Tucker, D. L.
name: Smith, J. A.
name: Lee, B. C.
name: Annis, J.
name: Lin, H.
name: Karachentsev, I.
name: Laubscher, B. E.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new catalog of merging galaxies obtained through an automated systematic search routine. The 1479 new pairs of merging galaxies were found in approximately 462 sq deg of the Sloan Digital Sky Survey Early Data Release (SDSS EDR; Stoughton et al. 2002) photometric data, and the pair catalog is complete for galaxies in the magnitude range 16.0 <= g* <= 20. The selection algorithm, implementing a variation on the original Karachentsev (1972) criteria, proved to be very efficient and fast. Merging galaxies were selected such that the inter-galaxy separations were less than the sum of the component galaxies' radii. We discuss the characteristics of the sample in terms of completeness, pair separation, and the Holmberg effect. We also present an online atlas of images for the SDSS EDR pairs obtained using the corrected frames from the SDSS EDR database. The atlas images also include the relevant data for each pair member. This catalog will be useful for conducting studies of the general characteristics of merging galaxies, their environments, and their component galaxies. The redshifts for a subset of the interacting and merging galaxies and the distribution of angular sizes for these systems indicate the SDSS provides a much deeper sample than almost any other wide-area catalog to date.
description: 58 pages, which includes 15 figures and 6 tables. Figures 2, 8, 9, 10, 11, 13, and 14 are provided as JPEG files. For online atlas, see http://home.fnal.gov/~sallam/MergePair/ . Accepted for publication in AJ
Nonlinear Voter Models: The Transition from Invasion to Coexistence
Creators: name: Schweitzer, Frank
name: Behera, Laxmidhar
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: In nonlinear voter models the transitions between two states depend in a nonlinear manner on the frequencies of these states in the neighborhood. We investigate the role of these nonlinearities on the global outcome of the dynamics for a homogeneous network where each node is connected to $m=4$ neighbors. The paper unfolds in two directions. We first develop a general stochastic framework for frequency dependent processes from which we derive the macroscopic dynamics for key variables, such as global frequencies and correlations. Explicite expressions for both the mean-field limit and the pair approximation are obtained. We then apply these equations to determine a phase diagram in the parameter space that distinguishes between different dynamic regimes. The pair approximation allows us to identify three regimes for nonlinear voter models: (i) complete invasion, (ii) random coexistence, and -- most interestingly -- (iii) correlated coexistence. These findings are contrasted with predictions from the mean-field phase diagram and are confirmed by extensive computer simulations of the microscopic dynamics.
description: Completely revised and extended version, new results and interpretation. 39 pages, 24 figures. European Physical Journal B, vol 67 (2009)
Novas perspectivas para a CDU face à sua possível inserção no projecto UNISIST
Creators: name: Campos, Astério
Publisher: name: Cadernos BAD
Year: 1972

description: Pretende-se informar quantos se interessam pela CDU das possíveis transformações que este sistema de classificação bibliográfica poderá vir a sofrer se for integrado no projecto UNISIST.
description: Cadernos BAD, N.º 2 (1972)
The nutrition impacts of women’s empowerment in Kenyan agriculture: Application of the multinomial endogenous switching treatment regression
Creators: name: Kassie, M.
name: Kassie, M.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Agricultural and Food Policy
subject: International Development
subject: women's empowerment
subject: technology adoption
subject: nutrition
subject: Kenya

description: Using household and individual survey data in rural Kenya, this paper assesses the impacts of women’s empowerment in agriculture individually as well as in combination with push–pull technology (PPT) on women’s and households’ nutritional status. We adopt a multiple treatment endogenous switching regression framework to control for potential endogeneity of women’s empowerment. The analysis shows that women’s empowerment has a positive and significant effect on women’s and households’ dietary diversity scores. The impact is significantly higher for empowered women belonging to PPT-adopting households than for their counterparts who have not adopted PPT. Similarly, disempowered women from PPT-adopting households have higher dietary diversity scores compared with disempowered women from non-adopting households. These results imply that individual and household welfare could be enhanced to a greater degree by combining women’s empowerment with technology adoption than by treating the two elements as separate development issues.
A Nudge With Your Fudge : The Impacts of Negative and Positive Labelling on Psychological Affect
Creators: name: Dasgupta, Abhigyan
name: Ebadi, Pardis
name: Kumar, Aditi
name: Lam, Chloe
name: Padilla, Olga-Emilia
name: Hein-Salvi, Claire
Publisher: name: The University of British Columbia
Year: 2022

description: As climate change is accelerating1, more foodservice businesses are using climate-friendly food labels to nudge consumers toward sustainable items2. However, no known study has examined the psychological impact of these labels on consumers. Thus, the present study aims to examine whether negative food labels (NFLs) are more effective at nudging consumers toward sustainable items compared to positive food labels (PFLs) and how they impact psychological affect. Data were collected from UBC undergraduates (N=253) via online surveys. Participants were randomly assigned to one of three conditions: the PFL condition, the NFL condition, and the no-label condition. In each condition, participants rated how likely they were to choose each food shown. Afterwards, we measured their shame, guilt, and positive and negative affect. Findings from an ANOVA analysis show that there was no significant difference between the performance of the NFLs and PFLs. Results from a correlational analysis show that NFLs were not associated with increased negative affect, shame or guilt. PFLs were associated with decreased negative affect but not with positive affect, shame or guilt. Our study demonstrates that NFLs should not be avoided on products for fear of negative psychological impact on consumers, and the use of PFLs should be continued. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Alguns problemas catalográficos que se põem a internacionalização da shared cataloging
Creators: name: Raposo, Maria Emília
Publisher: name: Cadernos BAD
Year: 1972

description: Apontam-se algumas posicões divergentes em matéria de catalogação que se encontram em várias regras e estudos. Mostra-se a necessidade do estabelecimento de princípios uniformes que permitam uma futura cooperação internacional, começando, mesmo, por referir-se a experiência já neste campo realizada pela Biblioteca do Congresso, a Shared Cataloging, que se descreve. Apela-se para o estudo dos problemas que no artigo se afloram, como contributo para·umas regras de aceitação universal e, de momento, contributo para as projectadas regras portuguesas. de catalogação que será desejável satisfaçam, desde já, essas exigências.
description: Cadernos BAD, N.º 2 (1972)
O equívoco da «figura de prestígio nacional» à frente das grandes bibliotecas, arquivos e centros de documentação do País
Creators: name: BAD, Cadernos
Publisher: name: Cadernos BAD
Year: 1972

description: O equívoco da «figura de prestígio nacional» à frente das grandes bibliotecas, arquivos e centros de documentação do País
description: Cadernos BAD, N.º 2 (1972)
Peromyscopsylla scotti I. Fox 1939
Creators: name: Morrone, Juan J.
name: Acosta, Roxana
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Siphonaptera
Leptopsyllidae
Peromyscopsylla
Peromyscopsylla scotti

description: P. scotti I. Fox, 1939
Peromyscopsylla scotti I. Fox, 1939: 49.
description: Published as part of Morrone, Juan J. & Acosta, Roxana, 2006, A synopsis of the fleas (Insecta: Siphonaptera) parasitizing New World species of Soricidae (Mammalia: Insectivora), pp. 1-30 in Zootaxa 1354 on page 23, DOI: 10.5281/zenodo.273605
Multifrequency Radiation of Extragalactic Large-Scale Jets
Creators: name: Stawarz, L.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Large-scale extragalactic jets, observed to extend from a few to a few hundred kiloparsecs from active galactic nuclei, are now studied over many decades in frequency of electromagnetic spectrum, from radio until (possibly) TeV gamma rays. For hundreds of known radio jets, only about 25 are observed at optical frequencies. Most of them are relatively short and faint, with only a few exceptions, like 3C 273 or M 87, allowing for detailed spectroscopic and morphological studies. Somewhat surprisingly, the large-scale jets can be very prominent in X-rays. Up to now, about 25 jets were detected within the 1 - 10 keV energy range, although the nature of this emission is still under debate. In general, both optical and X-ray jet observations present serious problems for standard radiation models for the considered objects. Recent TeV observations of M 87 suggest the possibility of generating large photon fluxes at these high energies by its extended jet. In this paper we summarize information about multiwavelength emission of the large-scale jets, and we point out several modifications of the standard jet radiation models (connected with relativistic bulk velocities, jet radial stratification and particle energization all the way along the jet), which can possibly explain some of the mentioned puzzling observations. We also comment on gamma-ray emission of the discussed objects.
description: 29 pages. Modified version, accepted for publication in Chinese Journal of Astronomy and Astrophysics
Effects of childhood work on long-term out-migration decision in rural Ethiopia
Creators: name: Mussa, E.C.
name: Mirzabaev, A.
name: Admassie, A.
name: Rukundo, E.N.
name: Mussa, E.C.
name: Mirzabaev, A.
name: Admassie, A.
name: Rukundo, E.N.
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy
Community/Rural/Urban Development
International Development

description: We investigate the effects of childhood work on migration decisions and patterns later in life using a novel prospective panel dataset from rural Ethiopia. The data were generated through a follow-up tracking survey of 4-14-year-old children at baseline (1999/2000) after sixteen years in 2015/2016. We find that village out-migration was by and large dominated by females and schoolchildren. Compared to schoolingonly, fulltime childhood work significantly reduces the probability of village out-migration later in life. In contrast, those who combined work and study at baseline were highly likely to engage in economic or employment out-migrations. Thus, we presented new evidence in the related literature that besides the existing rural to urban labor migration explanations, childhood conditions in a rapidly changing developing economy setting may also affect children’s long-term migration decisions. The findings also suggest that elimination of full-time child labor should be a long-term human capital policy priority. However, excluding the worst forms of child labor, an attempt for child labor elimination in all its forms could be un(counter)productive. More importantly, rural child education seems to be as critical as enabling the future farm labor to shift from farm to non-farm activities and facilitate the structural transformation process.
The Effects of Biophilic Lighting on Student Comfort and Productivity
Creators: name: Deol, Jyoti
name: Lee, Hakyoung
name: Kwok, Adam
name: Pappo, Jo
name: Zhou, Rita
Publisher: name: The University of British Columbia
Year: 2022

description: In this study, we aimed to investigate the optimal lighting choice for UBC to incorporate into campus buildings to support UBC students’ productivity and comfort levels. We did this by testing the effects of different biophilic lighting options in workspaces with limited access to natural daylight. We anticipated that integrating methods to mimic lighting that follows a circadian rhythm has a more positive effect overall than mimicking daylight or artificial lighting. Using a Qualtrics online survey, we presented participants (N=95) with pictures that represent three different timestamped lighting conditions that show: (1) artificial lighting, (2) mimicked natural daylight, and (3) mimicked lighting that follows a circadian rhythm. We examined the data collected from the Likert scale, PEECE scale and a productivity scale in which participants rated their perceived productivity and comfort among the three conditions. According to the results, a significantly better effect in comfort is found in lighting that follows our circadian rhythm than in other conditions. The results also proved our prediction that mimicking natural light conditions through either biophilic lighting option can improve productivity and comfort compared to traditional artificial lighting. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Design and Rating of Risk-Contingent Credit for Balancing Business and Financial Risks for Kenyan Farmers
Creators: name: Shee, A.
name: Turvey, C.
name: You, L.
name: Shee, A.
name: Turvey, C.
name: You, L.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Agricultural Finance
subject: International Development
subject: Risk and Uncertainty
subject: Kenya
subject: bundled credit
subject: risk rationing
subject: agricultural weather risk
subject: risk modeling

description: Weather related agricultural risks and limited access to credit are serious impediments to agricultural productivity and growth in developing countries. This paper describes a novel insurance linked credit model piloted in Kenya, where insurance markets are effectively absent and farmers do not borrow because of the risk of losing their collateral. One of the challenges in deigning bundled credit products, in the absence of traded securities, is the actuarial pricing and risk rating of the insurance and the loan product. We develop a rainfall linked risk-contingent credit that transfers drought risk related perils from borrower to lender via insurance mechanism that provide a balance between business and credit risks for smallholder farmers. We describe the methodology used to design and rating of a risk-contingent structured operating agricultural credit instrument using CHIRPS rainfall data from 1981-2016 in Kenya. We illustrate the use of Monte Carlo methods to risk modelling that can be integrated within general insurance and credit rating framework. The innovative design and methodology presented in this paper are as important as the product delivery mechanism and will be of interest to specialists in development economics and agricultural finance.
farm household’s participation in governance: lessons from devolved systems in kenya
Creators: name: Njagi, T.
name: Kinyumu, N.
name: Kirimi, L.
name: Njagi, T.
name: Kinyumu, N.
name: Kirimi, L.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Agricultural and Food Policy
subject: Farm Management
subject: International Development
subject: Devolution
subject: Governance
subject: Community Participation
subject: Kenya

description: Citizen participation is widely recognised as a key strategy for improving governance by increasing the efficiency of public service delivery, government responsiveness to local needs, and accountability for public expenditure. This study, aims at providing an understanding of the extent of citizens’ participation in the agriculture sector. Household’s decision to participate greatly influenced by their experience in participation in development meetings in the past. The study, therefore, recommends that the county governments should create a greater awareness of the development programmes and projects and support community-based organisations in civic education to enhance awareness besides the already existing channels of communication.
Sculpting stable structures in pure liquids
Creators: name: Emeršič, Tadej
name: Zhang, Rui
name: Kos, Žiga
name: Čopar, Simon
name: Osterman, Natan
name: de Pablo, Juan J.
name: Tkalec, Uroš
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Pure liquids in thermodynamic equilibrium are structurally homogeneous. In liquid crystals, flow and light pulses are used to create reconfigurable domains with polar order. Moreover, through careful engineering of concerted microfluidic flows and localized opto-thermal fields, it is possible to achieve complete control over the nucleation, growth, and shape of such domains. Experiments, theory, and simulations indicate that the resulting structures can be stabilized indefinitely, provided the liquids are maintained in a controlled non-equilibrium state. The resulting sculpted liquids could find applications in microfluidic devices for selective encapsulation of solutes and particles into optically active compartments that interact with external stimuli.
Parboiling as a diversification strategy to improve rice market value in Senegal
Creators: name: Fiamohe, R.
name: Kinkpe, T.A.
name: Agossadou, A.J.
name: Ndindeng, S.A.
name: Tossou, H.S.
name: Fiamohe, R.
name: Kinkpe, T.A.
name: Agossadou, A.J.
name: Ndindeng, S.A.
name: Tossou, H.S.
Publisher: name: Unknown
Year: 2018
Subjects: Agricultural and Food Policy
Crop Production/Industries
International Development

description: This study used an experimental approach involving 144 rice shoppers in Dakar market to assess market value of parboiled rice compared to traditional white rice as consumed in Senegal. Four different rice types produced locally were used in the experiment: one standard rice, Sahel 108 white rice and three alternatives parboiled rice of Sahel 108, 134 and 177. The descriptive analysis shows that the market price of each alternative parboiled rice was over the double of one of the standard rice with a premium estimated at 71% for parboiled rice of Sahel 108 and134, and 129% of Sahel 177 over the standard rice. In addition to the strong preference for broken rice, taste (80%), whiteness (60%) and cleanliness (60%) were revealed as the most important rice criteria in Dakar market respectively. The robust regression analysis suggests that poor and non-educated people are an important market segment for Sahel 108 white rice in comparison to richer and educated consumers who value more the parboiled rice. Word of mouth communication appears to be a potentially marketing strategy to promote Sahel 108 non-parboiled rice in poor households while promoting Sahel parboiled rice among rich and educated households in Dakar in Senegal.
Azimuthally sensitive Hanbury Brown-Twiss interferometry in Au+Au collisions at sqrt(s_{NN}) = 200 GeV
Creators: name: STAR Collaboration
Publisher: name: arXiv
Year: 2003
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the results of a systematic study of the shape of the pion distribution in coordinate space at freeze-out in Au+Au collisions at RHIC using two-pion Hanbury Brown-Twiss (HBT) interferometry. Oscillations of the extracted HBT radii vs. emission angle indicate sources elongated perpendicular to the reaction plane. The results indicate that the pressure and expansion time of the collision system are not sufficient to completely quench its initial shape.
description: 6 pages, 4 figures, published version
Caste-based social segregation and access to public extension services in India
Creators: name: Krishna, V.
name: Vikraman, S.
name: Aravalath, L.
name: Krishna, V.
name: Vikraman, S.
name: Aravalath, L.
Publisher: name: Unknown
Year: 2018
Subjects: Labor and Human Capital

description: Caste-based social segregation manifests its influence in various spheres of life and perpetuates economic inequality and oppression. The present study, analysing nationally representative data from rural India, shows that differential access to quality information on crop production technologies critically limits the income potential of farmers of socially backward castes. The inter-caste differences in crop income are found arising due to differences in both resource endowment status and access to the public extension networks. Value of public extension services was particularly low in regions where socially backward castes form a majority in the population. Acknowledgement : The authors thank Sukhadeo Thorat, Esther Gehrke, and Sethulekshmy Rajagopal for their constructive comments on previous versions of this manuscript.
Farmer Demand and Willingness-To-Pay for Sweet Potato Silage-Based Diet as Pig Feed in Uganda
Creators: name: Asindu, M.
name: Ouma, E.
name: Elepu, G.
name: Naziri, D.
name: Asindu, M.
name: Ouma, E.
name: Elepu, G.
name: Naziri, D.
Publisher: name: Unknown
Year: 2018
Subjects: Demand and Price Analysis

description: This study was undertaken to assess farmer demand and willingness-to-pay for sweet potato silage-based diet as pig feed by smallholder farmers in Uganda. Information for the study was collected through secondary data review and semi-structured questionnaire interviews to assess farmer WTP. Semi-structured interviews were conducted with 256 respondents randomly drawn from 16 purposive clusters formed at a radius of 3 km around 16 farmers piloting sweet potato silage based diets for pig feed. The results show that pig farming is mainly the responsibility of women, with farmers mean willingness to pay price ranging from 679 to 697 Ugandan shillings, for a kilogram of sweet potato silage based diet. At the mean prices, annual demand for silage is 17,679 tons with a market potential estimated between 12.0 to 12.3 billion Uganda shillings. The study concludes that at the mean willingness to pay prices, there is a huge market potential that can be exploited by SMEs venturing in the livestock feed industry. Acknowledgement : This study is an output of Expanding Utilization of Roots, Tubers and Bananas and Reducing Their Postharvest Losses (RTB-ENDURE), a 3-year project (2014-2016) implemented by the CGIAR Research Program on Roots, Tubers and Bananas (RTB) with funding by the European Union and technical support of IFAD. Special thanks also go to VEDCO and CHAIN Uganda as well as district production officers of Masaka and Kamuli and other participants who fully took part in this study.
XMM-Newton observations of the dwarf nova YZ Cnc in quiescence
Creators: name: Hakala, Pasi
name: Ramsay, Gavin
name: Wheatley, Peter
name: Harlaftis, Emilios
name: Papadimitriou, C.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from the XMM observations of the dwarf nova YZ Cnc in a quiescent state. We have performed a detailed time series analysis of the resulting light curves. Unusually, we do not detect any orbital modulation in the UV, with only marginal evidence for X-ray modulation on this period. Although there are peaks in the X-ray periodograms at periods less than 5000 s, we attribute them to red noise effects and assign significance to them using a novel approach. The variability in the UV and optical bands can also be modelled as a result of aperiodic variability (red noise) in the system. There is evidence that the UV and X-ray fluxes are anti-correlated with a time delay of about 100 s, with the UV lagging behind the X-ray emission. This anti-correlation is intriguing, but is only present on two occasions lasting several 1000 s each. The X-ray spectrum shows similar emission features to other dwarf novae and is well fitted using a multi-temperature emission model. We measure a relatively high X-ray luminosity of ~1.4x10^{32} ergs/s, although this is consistent with a low binary inclination. Finally, we find evidence for a possible -1200km/s blue shift in the fitted Fe K line energies, possibly indicating the presence of an outflow in this low inclination system.
description: 9 pages, accepted for publication in A&A
Increasing the bandwidth of resonant gravitational antennas: The case of Explorer
Creators: name: Astone, P.
name: Babusci, D.
name: Bassan, M.
name: Carelli, P.
name: Cavallari, G.
name: Coccia, E.
name: Cosmelli, C.
name: D'Antonio, S.
name: Fafone, V.
name: Fauth, A. C.
name: Federici, G.
name: Giordano, G.
name: Marini, A.
name: Minenkov, Y.
name: Modena, I.
name: Modestino, G.
name: Moleti, A.
name: Pallottino, G. V.
name: Pizzella, G.
name: Quintieri, L.
name: Rocchi, A.
name: Ronga, F.
name: Terenzi, R.
name: Torrioli, G.
name: Visco, M.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Resonant gravitational wave detectors with an observation bandwidth of tens of hertz are a reality: the antenna Explorer, operated at CERN by the ROG collaboration, has been upgraded with a new read-out. In this new configuration, it exhibits an unprecedented useful bandwidth: in over 55 Hz about its frequency of operation of 919 Hz the spectral sensitivity is better than 10^{-20} /sqrt(Hz) . We describe the detector and its sensitivity and discuss the foreseable upgrades to even larger bandwidths.
description: 4 pages- 4 figures Acceted for publication on Physical Review Letters
Isogeometric analysis in option pricing
Creators: name: Pospíšil, Jan
name: Švígler, Vladimír
Publisher: name: arXiv
Year: 2019
Subjects: subject: Computational Finance (q-fin.CP)
subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 35R09, 65M60, 65D07, 91G20, 91G6

description: Isogeometric analysis is a recently developed computational approach that integrates finite element analysis directly into design described by non-uniform rational B-splines (NURBS). In this paper we show that price surfaces that occur in option pricing can be easily described by NURBS surfaces. For a class of stochastic volatility models, we develop a methodology for solving corresponding pricing partial integro-differential equations numerically by isogeometric analysis tools and show that a very small number of space discretization steps can be used to obtain sufficiently accurate results. Presented solution by finite element method is especially useful for practitioners dealing with derivatives where closed-form solution is not available.
Stenoponia
Creators: name: Morrone, Juan J.
name: Acosta, Roxana
Publisher: name: Zenodo
Year: 2006
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Siphonaptera
Hystrichopsyllidae
Stenoponia

description: Stenoponia Jordan & Rothschild, 1911
Stenoponia Jordan & Rothschild, 1911a: 391.
description: Published as part of Morrone, Juan J. & Acosta, Roxana, 2006, A synopsis of the fleas (Insecta: Siphonaptera) parasitizing New World species of Soricidae (Mammalia: Insectivora), pp. 1-30 in Zootaxa 1354 on page 17, DOI: 10.5281/zenodo.273605
Analyzing Climate Change Precipitation Effects on Irrigated Agriculture: Why Temporal Resolution Matters?
Creators: name: Torres, M.
name: Howitt, R.
name: Rodrigues, L.
name: Torres, M.
name: Howitt, R.
name: Rodrigues, L.
Publisher: name: Unknown
Year: 2018
Subjects: Environmental Economics and Policy

description: Fluctuations in water availability, either in the form of precipitation or stored water in surface and groundwater bodies, will affect agricultural productivity and farmers income. Climate science tells us that much of these fluctuations will be in the form of shifts in the timing and intensity of precipitation. Understanding these relationships and the accurate estimation of their economic effects may, therefore, help in the designing of effective agricultural public policies to mitigate drought and climate change impacts on agriculture. In this context, this paper introduces a novel hydro-economic model in which the timing of rainfall and supplementary irrigated water supplies affect the productivity of a partially irrigated agricultural system. The specification of the production function and water availability is designed to reflect shifts in monthly precipitation totals and to show how the opportunity cost of supplementary irrigation supply varies with changes in the timing of precipitation. Results show that shifts in monthly precipitation parterns have indeed significant impacts on agricutltural income and that the coarser the temporal resolution that the modeler chooses, the lower is her ability to precisely measure them. Acknowledgement :