Search results for "Plan"
showing 10 items of 24706 documents
Diversification in evolutionary arenas - assessment and synthesis
2019
Abstract Understanding how and why rates of evolutionary diversification vary is a central issue in evolutionary biology and ecology. The concept of adaptive radiation has attracted much interest, but is metaphorical and verbal in nature, making it difficult to quantitatively compare different evolutionary lineages or geographic regions. In addition, the causes of evolutionary stasis are relatively neglected. Here we review the central concepts in the evolutionary diversification literature and bring these together by proposing a general framework for estimating rates of diversification and quantifying their underlying dynamics, which can be applied across clades and regions and across spat…
Applying the integrated trans-contextual model to mathematics activities in the classroom and homework behavior and attainment
2016
The aim of the present study was to test hypotheses of the trans-contextual model. We predicted relations between perceived autonomy support, autonomous motivation toward mathematics learning activities in an educational context, autonomous motivation toward mathematics homework in an out-of-school context, social-cognitive variables and intentions for future engagement in mathematics homework, and mathematics homework outcomes. Secondary school students completed measures of perceived autonomy support from teachers and autonomous motivation for in-class mathematics activities; measures of autonomous motivation, social-cognitive variables, and intentions for out-of-school mathematics homewo…
Relationship of transforming growth factor-beta1 with tumor necrosis factor-alpha and endothelial activation in patients with stable renal transplant…
2008
Estudio de la incompatibilidad ABO en el trasplante alogénico de progenitores hematopoyéticos
2021
La incompatibilidad ABO entre donante y receptor no supone un impedimento en la realización de un alotrasplante de progenitores hematopoyéticos (alo-TPH). Sin embargo, se ha asociado con una mayor morbilidad y mortalidad, así como a un aumento de eventos inmunohematológicos y de requerimientos transfusionales en los pacientes trasplantados con incompatibilidad ABO. Planteamos la hipótesis de que un conocimiento detallado de estos aspectos podría ser crucial para optimizar el manejo y la estrategia transfusional en el paciente individual sometido a un trasplante con incompatibilidad ABO y así disminuir la morbilidad y mortalidad asociada. El objetivo general de la tesis es realizar un anális…
Konfigurowanie granic gatunkowych a problem polityczności. Przypadek posthumanizmu i transhumanizmu
2017
Przedmiotem artykułu są teoriopolityczne rozważania na temat posthumanizmu. Jest to podejście, które zrywa z humanistycznym dogmatem, że człowiek jest bytem najważniejszym w rzeczywistości. Zamiast tego posthumanizm dowartościowuje byty pozaludzkie (naturalne, sztuczne, rzeczy), z którymi ludzie wchodzą w rozmaite interakcje. Autor uznał, że problematyka posthumanistyczna może być rozpatrywana w perspektywie biopolityki, która zajmuje się relacjami między polityką a życiem. Jednakże w odróżnieniu od wcześniejszych ujęć wiążących biopolitykę z kontrolą populacji posthumanizm stawia na szali żywotność gatunkową. W artykule przedstawiono konsekwencje takiego myślenia dla problemu polityczności…
Cambio estructural en economías en transición : el impacto de la privatización sobre la restricción presupuestaria de las empresas rusas
1999
La transición desde una economía de planificación central hacia una economía de mercado exigía el establecimiento de las condiciones necesarias para que se produjese una transformación de la gestión empresarial, de las cuales la privatización de las empresas estatales constituía un elemento vital. No obstante, resultaba obvio que sin algunos cambios en el ámbito microeconómico las esperanzas para una transformación del sistema económico, tras más de seis décadas de economía planificada, no podrían verse cumplidas. Un cambio exógeno en la estructura de propiedad estrictamente en términos legales -esto es, de una regla formal- sin que los gestores de las empresas asimilen el cambio, transform…
Three-dimensional core-collapse supernovae with complex magnetic structures: I. Explosion dynamics
2021
Magnetic fields can play a major role in the dynamics of outstanding explosions associated to violent events such as GRBs and hypernovae, since they provide a natural mechanism to harness the rotational energy of the central proto-neutron star and power relativistic jets through the stellar progenitor. As the structure of such fields is quite uncertain, most numerical models of MHD-driven core-collapse supernovae consider an aligned dipole as initial magnetic field, while the field's morphology can actually be much more complex. We present three-dimensional simulations of core-collapse supernovae with more realistic magnetic structures, such as quadrupolar fields and, for the first time, an…
The impact of non-dipolar magnetic fields in core-collapse supernovae
2019
The magnetic field is believed to play an important role in at least some core-collapse supernovae if its magnitude reaches $10^{15}\,\rm{G}$, which is a typical value for a magnetar. In the presence of fast rotation, such a strong magnetic field can drive powerful jet-like explosions if it has the large-scale coherence of a dipole. The topology of the magnetic field is, however, probably much more complex with strong multipolar and small-scale components and the consequences for the explosion are so far unclear. We investigate the effects of the magnetic field topology on the dynamics of core-collapse supernovae and the properties of forming proto-neutron star (PNS) by comparing pre-collap…
Asymmetric effects of monetary policy shocks across US states
2019
This paper provides new empirical evidence of the asymmetric effects of monetary policy shocks across regions. Using a measure of unanticipated changes in the Fed's policy rates over the period 1969Q3–2008Q4 and a local projection method extended to account for spatial effects, we find that monetary policy tightening leads to a long-lasting decrease in states' real personal income, with asymmetric effects across states that are amplified by spatial spillovers. The paper then investigates the role played by several transmission channels finding larger contractionary effects of monetary policy tightening in states with higher manufacturing share, smaller firms, smaller banks and higher house …
Transnational ties: Resource or stressor on Peruvian migrants' well‐being?
2020
This paper explores the role of types and the intensity of transnational ties for migrants' well‐being from a global perspective. Based on a literature review, two competing hypotheses are formulated—transnational resources versus transnational stress—according to which transnational ties have either a positive or a negative effect on migrants' well‐being. Drawing on data from a large‐scale survey of Peruvian migrants worldwide, this paper examines the strength and direction of the relationship between Peruvian migrants' transnational ties and poor well‐being, the latter measured as depression/loneliness as a principal concern. While the multivariate regression results do not support the tr…