1,633 research outputs found
On the relative projective space
No full textLet (C, ⊗, 1) be an abelian symmetric monoidal category satisfying certain exactness conditions. In this paper we define a presheaf P n C on the category of commutative algebras in C and we prove that this functor is a C-scheme in the sense of B. Toen and M. Vaquié. We give another definition and prove that they give isomorphic C-schemes. This construction gives us a context of non-associative relative algebraic geometry. The most important example of the construction is the octonionic projective spaceFil: Data, Matias Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Matemática; ArgentinaFil: Osorio Morales, Maria Juliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Investigaciones Matemáticas "Luis A. Santaló". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Matemáticas "Luis A. Santaló"; Argentin
Harvesting Energy from fat-tail random vibrations
No full textWe illustrate how applied and computational mathematics tools in the field of probability, statistics and stochastic processes are applied in the preliminary design stage of an expectedly typical 21th century (nanotech) industrial process: the fabrication of carpets, paints and networks able to harvest energy from random vibrations.Fil: Peña Rosselló, Julián Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Dell'erba, Matias German. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Deza, R. R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Deza, J. I.. Universidad Politecnica de Catalunya; EspañaFil: Wio, H. S.. Consejo Superior de Investigaciones Cientificas. Instituto de Física de Cantabria; Españ
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Understanding Family Planning in San Ignacio, Belize
No full textThis study focuses on women’s decisions and experiences related to family planning in San Ignacio, Belize. The authors sought to identify family planning resources available in San Ignacio, as well as barriers to accessing these resources. Furthermore, this study explored how local barriers affected the use of contraception in San Ignacio. The first author traveled to San Ignacio and carried out four semi-structured interviews and one focus group with local women. She also conducted nine semi-structured interviews with community leaders. Women discussed their own knowledge and use of contraceptive methods, barriers to contraceptive use, the value of planned pregnancies and their pregnancy experiences. Community leaders reported that contraceptive methods were available but also admitted to the existence of perceived barriers to contraceptive use.
Women stated that planned pregnancies were desirable, but often unachievable because of religious beliefs, cultural norms, the opposition of family members, lack of knowledge of contraceptive methods and male partners seeking control over women. Community leaders reported that men are often unsupportive of contraceptive use and that religious groups often seek to discourage contraceptive use. Both women and community leaders stated that in San Ignacio, women are expected to have families and that local religious groups discourage the use of contraception.
Use of contraceptives among women in San Ignacio is thus not solely determined by the availability of contraceptives. Organizations that aim to promote family planning must implement multilevel initiatives that address the needs, desires and perspectives of community members, promote healthy relationships and challenge gender inequitable social norms
Understanding Family Planning in San Ignacio, Belize
No full textThis study focuses on women’s decisions and experiences related to family planning in San Ignacio, Belize. The authors sought to identify family planning resources available in San Ignacio, as well as barriers to accessing these resources. Furthermore, this study explored how local barriers affected the use of contraception in San Ignacio. The first author traveled to San Ignacio and carried out four semi-structured interviews and one focus group with local women. She also conducted nine semi-structured interviews with community leaders. Women discussed their own knowledge and use of contraceptive methods, barriers to contraceptive use, the value of planned pregnancies and their pregnancy experiences. Community leaders reported that contraceptive methods were available but also admitted to the existence of perceived barriers to contraceptive use.
Women stated that planned pregnancies were desirable, but often unachievable because of religious beliefs, cultural norms, the opposition of family members, lack of knowledge of contraceptive methods and male partners seeking control over women. Community leaders reported that men are often unsupportive of contraceptive use and that religious groups often seek to discourage contraceptive use. Both women and community leaders stated that in San Ignacio, women are expected to have families and that local religious groups discourage the use of contraception.
Use of contraceptives among women in San Ignacio is thus not solely determined by the availability of contraceptives. Organizations that aim to promote family planning must implement multilevel initiatives that address the needs, desires and perspectives of community members, promote healthy relationships and challenge gender inequitable social norms
Two new species of oxysarcodexia townsend (Diptera: Sarcophagidae) from the chaco forest ecoregion of South America
No full textTwo new Neotropical species of the genus Oxysarcodexia Townsend (Diptera: Sarcophagidae) from Chaco ecoregion of Argentina are described, O. berthet, sp. nov. and O. ibera, sp. nov. Both species were recovered from localities in the eastern part of the Chaco forest (Humid Chaco). The descriptions are based on the male external morphology and terminalia. Photographs and SEM images are provided to aid in the identification of the species.Fil: Dufek, Matias Ignacio. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas, Naturales y Agrimensura. Laboratorio de Biología de los Artrópodos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Mulieri, Pablo Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentin
Replication Data for: Social and Political Trust in a Low Trust Society
No full textOnline supplement, data and code (R file) to reproduce the results in "Social and Political Trust in a Low Trust Society", published by Political Behavior (2022-01-18
Micro-Optoelectromechanical Tilt Sensor
No full textThis paper presents a novel hybrid CMOS/MEMS tilt sensor with a 5∘ resolution over a 300∘ range. The device uses a MEMS-based semicircular mass suspended from a rigid body, projecting a shadow onto the CMOS-based optical sensor surface. A one-dimensional photodiode array arranged as a uniformly segmented ring is then used to determine the tilt angle by detecting the position of the semicircular mass. The complete sensor occupies an area of under 2.5 mm × 2.5 mm.Published versio
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Interaction of light with matter in optical fiber sensors: a biomedical engineering perspective
No full textUpdating the distribution of mesembrinellid flies (Diptera: Mesembrinellidae) in Argentina with the first record of Mesembrinella bicolor
No full textDurante muestreos llevados a cabo para evaluar la diversidad de dípteros caliptrados (Diptera: Calyptratae) en el nordeste de Argentina se detectó por primera vez a Mesembrinella bicolor (Fabricius, 1805). Este hallazgo representa la segunda especie de Mesembrinellidae para Argentina, luego de Mesembrinella bellardiana Aldrich, 1922 y el registro conocido más austral para una especie de Mesembrinellidae. Se incluye una breve diagnosis de ambas especies.During samplings carried out to evaluate the diversity of calyptrate flies (Diptera: Calyptratae) in northeastern Argentina, Mesembrinella bicolor (Fabricius, 1805) was first detected. This finding represents the second species of Mesembrinellidae from Argentina, after Mesembrinella bellardiana Aldrich, 1922 and the southernmost known record for a species of Mesembrinellidae. A brief diagnosis of both species is included.Fil: Dufek, Matias Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas, Naturales y Agrimensura. Laboratorio de Biología de los Artrópodos; ArgentinaFil: Mulieri, Pablo Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin
Education and earnings inequality in Mexico
No full textEducation attainment levels increased dramatically for Mexico's labor force in the 1980s and early 1990s. In parallel, the country experienced a pronounced increase in earnings inequality from 1984-94, reflected in a higher dispersion of wages and an absolute decline in the real incomes of less educated, poorer Mexicans. This increased wage dispersion presents policymakers with a tradeoff between efficiency considerations (favoring increased spending on higher education) and equity considerations (favoring a more equal distribution of per student spending) in the allocation of fiscal resources to education. The author concludes that the best way to deal with this equity-efficiency tradeoff is to encourage greater private participation in higher education. His main findings are that: a) The accumulation of human capital during 1984-94, as proxied by education attainment, was accompanied by a more equal distribution of education attainment levels over that period and, thus, exerted an equalizing effect on the distribution of incomes. The increased income inequalityobserved over that period appears to be caused by an increased rate of skill-based technological change, whose transmission to Mexico and other developing countries may have been facilitated by the increased openness of their economies. b) The greater dispersion of wager observed in Mexico during the past decade raised the rates of return on investing in higher education, reversing the traditional pattern where primary education exhibits the highest rates of return. c) The social rates of return across levels of schooling were more uniform in 1994 than in 1984, suggesting a more efficient assignment of education spending. At the same time, the distribution of spending on education became more egalitarian, as per student spending in higher education declined markedly compared with per student spending at the primary level. This surprising coincidence in the pattern of spending on education was only possible because Mexico started out with a very distorted resource allocation in education that was both highly inequitable and inefficient. As Mexico's policymakers are on the way to correcting these distortions, the opportunities for avoiding the equity-efficiency tradeoff within Mexico's centralized education framework will become progressively exhausted. d) There is little reason to expect the pace of technological change, which appears mainly responsible for raising wage dispersion and the relative returns on higher education, to abate. Efficiency considerations dictate that Mexico should respond by devoting more resources to higher education. However, the federal budget, which traditionally has financed the lion's share of higher education costs in Mexico, is unable to accommodate additional spending on higher education, while spending cuts elsewhere in the education sector are bound to raise serious equity questions. Thus, to avoid falling behind in terms of human capital accumulation, greater private sector participation is necessary, at least, in terms of cost recovery from the main beneficiaries of higher education.Decentralization,Teaching and Learning,Environmental Economics&Policies,Public Health Promotion,Curriculum&Instruction,Teaching and Learning,Environmental Economics&Policies,Health Monitoring&Evaluation,Gender and Education,Curriculum&Instruction
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