3,160 research outputs found
Nonstationary Stochastic Simulation of Strong Ground-Motion Time Histories : Application to the Japanese Database
For earthquake-resistant design, engineering seismologists employ
time-history analysis for nonlinear simulations. The nonstationary stochastic
method previously developed by Pousse et al. (2006) has been updated. This
method has the advantage of being both simple, fast and taking into account the
basic concepts of seismology (Brune's source, realistic time envelope function,
nonstationarity and ground-motion variability). Time-domain simulations are
derived from the signal spectrogram and depend on few ground-motion parameters:
Arias intensity, significant relative duration and central frequency. These
indicators are obtained from empirical attenuation equations that relate them
to the magnitude of the event, the source-receiver distance, and the site
conditions. We improve the nonstationary stochastic method by using new
functional forms (new surface rock dataset, analysis of both intra-event and
inter-event residuals, consideration of the scaling relations and VS30), by
assessing the central frequency with S-transform and by better considering the
stress drop variability.Comment: 10 pages; 15th World Conference on Earthquake Engineering, Lisbon :
Portugal (2012
The emergence of norms from conflicts over just distributions
Why is it that well-intentioned actions can create persistent conflicts? While norms are widely regarded as a source for cooperation, this article proposes a novel theory in which the emergence of norms can be understood as a bargaining process in which normative conflicts explain the finally emerging norm. The theory is tested with a dynamical experiment on conflicts over the consideration of equality, effort or efficiency for the distribution of joint earnings. Normative conflict is measured by the number of rejected offers in a recursive bargaining game. The emerging normative system is analyzed by feedback cycles between micro- and macro-level. It is demonstrated that more normative cues cause more normative conflict. Further, under the structural conditions of either simple or complex situations, the convergence towards a simple and widely shared norm is likely. In contrast, in moderately complex situations, convergence is unlikely and several equally reasonable norms co-exist. The findings are discussed with respect to the integration of sociological conflict theory with the bargaining concept in economic theory.social norms, normative conflict, bargaining, cooperation, experiment
Répercussions psychiatriques de l’infection VIH — Mise à jour
Les personnes infectées par le VIH présentent une vulnérabilité aux complications psychologiques et neuropsychiatriques. L'état actuel des connaissances indique que les syndromes cérébraux organiques et les troubles d'adaptation sont parmi les complications les plus fréquentes nécessitant une intervention psychiatrique. Les troubles affectifs sont une autre complication possible. L'auteur fait une mise à jour des connaissances actuelles sur la nature de ces troubles et leur traitement.Persons infected by the HIV virus are known to be vulnerable to psychological and neuropsychiatric complications. The state of knowledge today indicated that the organic cerebral syndromes and adaptation problems are among the most frequent complications requiring a psychiatric intervention. Affective problems represent yet another possible type of complication. The author provides an update of current knowledge on the nature of these problems, as well as their treatment
Hands Up: A Systematized Review Of Policing Sex Workers In The U.s.
This work lays the foundation for a study of criminalization and its effects on the health of street-based sex workers in the U.S. seeking to: 1) conduct a systematized review of sources from across the country settling on seventeen that describe experiences of harassment, false arrests, theft, physical abuse, sexual assault, HIV criminalization, survival tactics, reporting practices, and positive relations with law enforcement and 2.) compare the U.S. literature to international research, reflecting on the ways that public health researchers remain complicit in sustaining these harmful institutions by failing to consider diversity, the criminalized context of sex work, the links between policing and health, and the importance of collaboration. Through a radical framework of health and human rights I propose centering the experiences of street-based sex workers in a moment when the U.S. is renegotiating its relationship with law enforcement
Real-time dynamics in the one-dimensional Hubbard model
We consider single-particle properties in the one-dimensional repulsive
Hubbard model at commensurate fillings in the metallic phase. We determine the
real-time evolution of the retarded Green's function by matrix-product state
methods. We find that at sufficiently late times the numerical results are in
good agreement with predictions of nonlinear Luttinger liquid theory. We argue
that combining the two methods provides a way of determining the
single-particle spectral function with very high frequency resolution.Comment: 10 pages, 6 figures. Minor edits from v1. Version as publishe
Diseño de un Sistema de Gestión de Lecciones Aprendidas para la Gerencia de Proyectos
La gestión del conocimiento utiliza las Lecciones Aprendidas como una de las herramientas más populares para compartir el conocimiento de los proyectos. Las Lecciones Aprendidas ayudan a mejorar los procesos organizacionales y los patrones para la toma de decisiones con el fin de evitar que los equipos de proyectos vuelvan cometer los mismos errores del pasado. En Colombia, durante el 2018, más del 60% de los departamentos que ejecutaron proyectos del Sistema General de Regalías (SGR) obtuvieron un Índice de Gestión de Proyectos de Regalías (IGPR) “insuficiente” donde la Región Caribe participó con más del 85% de sus departamentos. Situación que contrasta con los bajos índices de Gestión de Conocimiento que presentan las Regiones Caribe y Amazonía en el modelo integrado de planeación y gestión (MIPG) en el mismo año. A partir de un diagnóstico realizado con más de 80 gerentes de proyectos de la región, se propone el diseño de un Sistema de Gestión de Lecciones Aprendidas basado en la espiral de conocimiento de Nonaka y Takeuchi que ayude a reciclar correctamente el conocimiento de los proyectos en el Caribe Colombiano. © 2020 Latin American and Caribbean Consortium of Engineering Institutions. All rights reserved
Bone growth and sexual dimorphism at birth in intrauterine-growth-retarded rats
This paper addresses the effect of a reduction of uterine blood flow (RUB) on postcranial bone growth in rats. The objectives were: (1) to discover and characterize the changes evoked by growth retardation through a reduction in placental blood flow, (2) to see if the resulting growth retardation is different in each bone, and (3) to analyze any sex-specific features. RUB was induced by the partial bending of uterine vessels at day 1 of pregnancy. Control and sham-operated animals were also included. The animals were X-rayed at birth. The lengths and widths of the humerus, radius, and femur and pelvic length, interischial, interpubic, and pubic widths were measured. Data were analyzed by ANOVA and LSD post hoc tests. The intersubject analysis showed significant differences between groups and non-significant differences between sexes. In males, sham-operated and RUB showed significant differences in pelvic lengths and widths, and humeral, radial, femoral, and tibial widths. In females, there were significant differences only for humeral widths, radial lengths and widths, and femoral and tibial widths. We conclude that reduced blood flow delays appendicular bone growth as observed at birth. Pelvic length was more affected than that of the limbs. The widths of the pelvic and limbs bones, in turn, were more altered than the lengths, and the growth of the males more than that of the females. Partial bending of uterine vessels compromised postcranial growth, though under such disadvantageous circumstances the females proved to be more capable of growing and thus more resilient than the males.Fil: Oyhenart, Evelia Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico de Antropología. Cátedra de Antropología Biológica IV; ArgentinaFil: Cesani Rossi, María Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: Castro, Luis Eduardo. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Cátedra de Estadística; ArgentinaFil: Quintero, Fabian Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico de Antropología. Cátedra de Antropología Biológica IV; ArgentinaFil: Fucini, Maria Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: Luna, María Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: Guimarey, Luis Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor María Ludovica" de La Plata; Argentin
The Origin of Radio Emission in Low-Luminosity Active Galactic Nuclei: Jets, Accretion Flows, or Both?
The low-luminosity active galactic nuclei in NGC 3147, NGC 4203, and NGC 4579
have been imaged at four frequencies with the Very Long Baseline Array. The
galaxies are unresolved at all frequencies, with size upper limits of
times the Schwarzschild radii of their central massive black holes.
The spectral indices between 1.7 and 5.0 GHz range from 0.2 to 0.4; one and
possibly two of the galaxies show spectral turnovers between 5.0 and 8.4 GHz.
The high brightness temperatures ( K) and relatively straight spectra
imply that free-free emission and/or absorption cannot account for the slightly
inverted spectra. Although the radio properties of the cores superficially
resemble predictions for advection-dominated accretion flows, the radio
luminosities are too high compared to the X-ray luminosities. We suggest that
the bulk of the radio emission is generated by a compact radio jet, which may
coexist with a low radiative efficiency accretion flow.Comment: To appear in ApJ (Letters). 4 page
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