Search results for "STAR"
showing 10 items of 4285 documents
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…
Transkulturālā aprūpe anestēzijas, intensīvās un neatliekamās aprūpes māsu praksē
2015
Bakalaura darba tēma – „Transkulturālā aprūpe anestēzijas, intensīvās neatliekamās aprūpes māsu praksē”. Pētījuma mērķis ir noskaidrot transkulturālās aprūpes nodrošināšanu anestēzijas, intensīvās un neatliekamās aprūpes māsu praksē un uzzināt ar kādām transkulturālās arpūpes problēmām māsas saskaras aprūpējot pacientus. Izvirzītie pētījuma jautājumi ir: Kā anestēzijas, intensīvās un neatliekamās aprūpes māsas nodrošina transkulturālo aprūpi saviem pacientiem un ar kādām transkulturālās aprūpes problēmām māsas saskaras savā praksē? Darbā tika izmantota kvalitatīvā pētniecības metode, pētījuma instruments - intervija. Apkopojot pētījuma rezultātus noskaidrojās, ka anestēzijas, intensīvās un …
Comparison of a MBR system start-up with and without inoculum: experimental and mathematical model application
2010
The performance of a membrane bioreactor (MBR) system and the extension and mechanisms that lead to the formation of the fouling may differ in relation to the start-up. As a consequence, the MBR start-up may constitute a crucial point that drastically influence the MBR performance in its lifespan. Indeed, the start-up influences the mechanisms of membrane fouling whose effects, in the case of irreversible cake deposition, can be modified only by a chemical membrane washing. In order to gain insights about the effect of the start-up on a MBR system, a MBR pilot plant was build-up and a mathematical model developed. The MBR system was constituted by a hollow fibre membrane module installed in…
A model for wastewater organic removal and fouling development in a SMBR pilot plant
2007
The paper presents the setting up of a mathematical model for membrane bioreactor able to simulate physical-biological wastewater organic removal. The model is basically divided into two sub-models: the first sub-model is basically devoted for the simulation of the biological features and the second one for the physical processes. In particular regarding the biological aspects, the ASM concept has been employed. On the other hand, the physical processes have been modelled considering the deep-bed theory taking into account not only the effect of the physical membrane filtration but also the cake layer effect. This latter operates as a biological membrane leading to a further reduction of th…
“De la mà de un florentí” y “De mestre Marçal”. Los dibujos del pintor valenciano Joan Moreno (1382-1448) y el cuaderno de los Uffizi
2020
A partir de la localización del testamento, inventario de bienes y almonedas posteriores tras el fallecimiento del pintor Joan Moreno en la ciudad de Valencia en 1448, se analiza la importancia del dibujo en los talleres del gótico internacional. La mención específica de dibujos del alemán Marçal de Sas (†1410) y de un florentino que podría ser Gherardo Starnina (c. 1354-1409-13) ofrece la posibilidad de analizar esta documentación en relación con el cuaderno de dibujos de los Uffizi (inv. 2264F-2281F, 18304F-18306F, 18324). Un repertorio de dibujos que se considera realizado en torno a los años 1400 en la ciudad de Valencia y que responde precisamente a las dos corrientes más importantes s…
“This is Just a Prototype” : How Ethics Are Ignored in Software Startup-Like Environments
2020
Artificial Intelligence (AI) solutions are becoming increasingly common in software development endeavors, and consequently exert a growing societal influence as well. Due to their unique nature, AI based systems influence a wide range of stakeholders with or without their consent, and thus the development of these systems necessitates a higher degree of ethical consideration than is currently carried out in most cases. Various practical examples of AI failures have also highlighted this need. However, there is only limited research on methods and tools for implementing AI ethics in software development, and we currently have little knowledge of the state of practice. In this study, we expl…
Exploring the Relationship Between Trust and Business Start-Ups in 52 Countries Over 16 Years
2021
A well-functioning social network involves attributes such as honesty, benevolence, fairness and confidence. When this network – trust - has formed, participants can count on reliable and consistent economic transactions. This has the effect of higher level of co-operation, but also co-dependence. Strong social networks, as measured in this study by the degree of interpersonal trust and trust in institutions, are foundational elements for societies wishing to progress to new higher levels of entrepreneurship and development. In a pooled OLS of up to 52 countries and 16 years, this study estimates how changes in interpersonal trust and trust in institutions affect new business creation. The …
Aitoa dialogia asiantuntijatyöhön : kielen tuotteistamisen uudet mekanismit vuorovaikutuskoulutusta markkinoivissa kurssikuvauksissa
2016
This article examines the way in which interaction is commodified on websites advertising professional training. It demonstrates how interaction is conceptualized in the training course advertisements and constructed as a sellable entity that will profit the potential client organization. The results show that the course advertisements associate interaction with the challenges caused by the multitude of perspectives and behavioral patterns present in any organization. In this way, interaction is conceptualized as a problem to be solved in order for the organization to reach its full potential. As a solution, the course advertisements further promise to enhance the participants' ability to j…