Search results for "space"
showing 10 items of 21658 documents
Nonlinear potential theory on metric spaces
2008
Uniformization of two-dimensional metric surfaces
2014
We establish uniformization results for metric spaces that are homeomorphic to the Euclidean plane or sphere and have locally finite Hausdorff 2-measure. Applying the geometric definition of quasiconformality, we give a necessary and sufficient condition for such spaces to be QC equivalent to the Euclidean plane, disk, or sphere. Moreover, we show that if such a QC parametrization exists, then the dilatation can be bounded by 2. As an application, we show that the Euclidean upper bound for measures of balls is a sufficient condition for the existence of a 2-QC parametrization. This result gives a new approach to the Bonk-Kleiner theorem on parametrizations of Ahlfors 2-regular spheres by qu…
Some critical remarks on the paper “A note on the metrizability of tvs-cone metric spaces” / Некоторые критические замечания о работе «Заметки о метр…
2018
This short and concise note provides a detailed exposition of the approach and results established by (Lin et al, 2015, pp.271-279). We show that the obtained results are not particularly surprising and new. Namely, using an old result due to K. Deimling it is indicated that tvs-cone metric spaces over solid cones are actually cone metric spaces over normal solid cones. Hence, there are only cone metric spaces over normal solid cones or over normal non-solid cones. One question still unanswered is whether an ordered topological vector space with a non-normal non-solid cone exists. / В представленных, в данной статье, заметках приведен подробный обзор методов и полученных результатов исследо…
CHANGES IN THE CITY SPACE AGAINST THE BACKGROUND OF THE SUSTAINABLE DEVELOPMENT CONCEPT: THE CASE OF OPOLE
2021
Koncepcja zrównoważonego rozwoju zyskuje coraz większą popularność zarówno w nauce, jak i w praktyce. Jest ona podstawą do realizacji działań i inicjatyw mających na celu poprawę warunków życia ludności miejskiej przy jednoczesnym poszanowaniu środowiska naturalnego. Decyzje podejmowane przez zarządzających miastami dotyczące nowych projektów powinny uwzględniać efekty ekonomiczne i środowiskowe oraz głos społeczności lokalnej. Jest to zadanie niezwykle trudne, a jego wyniki mogą spotkać się z aprobatą lub krytyką. Niemniej jednak podejmowane działania powinny zmniejszać problemy, z jakimi boryka się miasto i jego mieszkańcy. Badania oparte zostały na opisowym studium przypadku jako metodol…
Treated waste water reuse impact on soil microbial community structure as assessed by Automated Ribosomal Intergenic Spacer Analysis (ARISA) fingerpr…
2007
International audience
Esteban, Fernando Osvaldo (ed.) (2013). Espacios transnacionales de la migración latinoamericana en Europa
2014
Ressenya de l'obra editada per Fernando Osvaldo Esteban apareguda el 2013, Espacios transnacionales de la migración latinoamericana en Europa. Buenos Aires: Antropofagia. 171 p. ISBN 978-987-1238-96-5
Single Event Transients and Pulse Quenching Effects in Bandgap Reference Topologies for Space Applications
2016
An architectural performance comparison of bandgap voltage reference variants, designed in a $0.18~\mu \text {m}$ CMOS process, is performed with respect to single event transients. These are commonly induced in microelectronics in the space radiation environment. Heavy ion tests (Silicon, Krypton, Xenon) are used to explore the analog single-event transients and have revealed pulse quenching mechanisms in analogue circuits. The different topologies are compared, in terms of cross-section, pulse duration and pulse amplitude. The measured results, and the explanations behind the findings, reveal important guidelines for designing analog integrated circuits, which are intended for space appli…
Different Measurement Setup Configurations for Space Charge test in Mini Cable Specimens with the PEA Method
2019
Under DC stress, the space charge accumulation is believed one of the most responsible of dielectrics ageing. For this reason, due to the increase of the HVDC transmission, a recommendation has been proposed. The latter want to introduce the space charge measure, with the PEA method, in cable specimens during the prequalification or type tests. Considering the several issues related to this kind of measures the aim of the proposed work is find a measurement setup for mini cable specimens which is able to provide a clear and clean space charge profile. Therefore, different tests have been made in this work. In particular, the length of the cable specimen, the width of the pulse electrodes, a…
A new approach to calibrate the thermal conditions in space charge measurements on HVDC mini-cables
2019
The PEA method is currently widespread used for space charge measurements in mini-cables in order to qualify the behavior of semicon-dielectric-semicon compound under electric and thermal stress. The main goal of this research is to quantitatively evaluate the relationship between the thermal boundary conditions applied to cables or mini-cables and the maximum local electric field due to the accumulated space charge. Hitherto, several research groups have obtained thermal gradients over the dielectric's radius heating the conductor by Joule effect due to an induced current. In this paper, a numerical approach is offered to calibrate the heat exchange boundary conditions to apply to a sample…