Search results for "Direct"
showing 10 items of 2669 documents
Aktīvā kataloga migrēšanas rīks
2016
Šī kvalifikācijas darba mērķis ir izstrādāt programmu “Aktīvā kataloga migrēšanas rīks”. Programmas uzdevums būs veikt uz Windows Server operētājsistēmas bāzēta servera Aktīvā kataloga lietotāju un lietotāju grupu informācijas eksportēšanu jeb dublēšanu, kā arī šīs informācijas importēšanu uz jaunizveidota servera. Programma izstrādāta programmēšanas valodā C#, balstoties uz .Net ietvaru.
JIRA platformas pieteikumu vizualizācijas sistēma
2018
Kvalifikācija darba ietvaros tika izveidota sistēma, kas spēj attēlot JIRA platformas kanban paneļus daudz uzskatāmākā veidā. Sistēmas administratoriem ir iespēja izveidot prezentācijas no sev interesējošiem paneļiem, lai varētu vieglāk sekot līdzi projektu norisei. Sistēma sastāv no divām daļām – servera puses, kurā tiek veikti pieprasījumi no JIRA platformas un apstrādāti saņemtie dati, kā arī lietotāja puses, kurā tiek attēlotas paneļu prezentācijas, kā arī administratoriem pieejamā prezentāciju rediģēšana un statistika. Projektu veidoja divi LU studenti, katram atbildot par vienu no divām daļām.
Ficción y compromiso ontológico
2014
En este trabajo me ocupo de la semántica de los términos de ficción, en el marco de una posición de tipo abstractista (KRIPKE 2011 y 2013, VAN INWAGEN 1977, SALMON 1998 y 2002, THOMASSON 1999, PREDELLI 1997, 2002 y 2005 y VOLTOLINI 2011). En particular, me concentro en dos problemas que afectan a este tipo de posiciones: el primero de ellos es dar cuenta de la verdad intuitiva de enunciados como "Ulises duerme en la playa de Ithaca"; el segundo es explicar la aceptación, también intuitiva, de que "Ulises no existe" es un enunciado verdadero. In this paper I am concerned with a variant of Kripke´s abstractist theory of fiction, namely, the semantic theory according to which proper names and …
Vertical versus horizontal Sobolev spaces
2020
Let $\alpha \geq 0$, $1 < p < \infty$, and let $\mathbb{H}^{n}$ be the Heisenberg group. Folland in 1975 showed that if $f \colon \mathbb{H}^{n} \to \mathbb{R}$ is a function in the horizontal Sobolev space $S^{p}_{2\alpha}(\mathbb{H}^{n})$, then $\varphi f$ belongs to the Euclidean Sobolev space $S^{p}_{\alpha}(\mathbb{R}^{2n + 1})$ for any test function $\varphi$. In short, $S^{p}_{2\alpha}(\mathbb{H}^{n}) \subset S^{p}_{\alpha,\mathrm{loc}}(\mathbb{R}^{2n + 1})$. We show that the localisation can be omitted if one only cares for Sobolev regularity in the vertical direction: the horizontal Sobolev space $S_{2\alpha}^{p}(\mathbb{H}^{n})$ is continuously contained in the vertical Sobolev sp…
Adjacency matrices of random digraphs: singularity and anti-concentration
2017
Let ${\mathcal D}_{n,d}$ be the set of all $d$-regular directed graphs on $n$ vertices. Let $G$ be a graph chosen uniformly at random from ${\mathcal D}_{n,d}$ and $M$ be its adjacency matrix. We show that $M$ is invertible with probability at least $1-C\ln^{3} d/\sqrt{d}$ for $C\leq d\leq cn/\ln^2 n$, where $c, C$ are positive absolute constants. To this end, we establish a few properties of $d$-regular directed graphs. One of them, a Littlewood-Offord type anti-concentration property, is of independent interest. Let $J$ be a subset of vertices of $G$ with $|J|\approx n/d$. Let $\delta_i$ be the indicator of the event that the vertex $i$ is connected to $J$ and define $\delta = (\delta_1, …
A New Approach to Partial Discharge Detection Under DC Voltage: Application to Different Materials
2021
Usability of a new Direct Current Periodic waveform for partial discharge qualification in HVDC systems is exemplified by tests performed on different materials.
Partial discharges behavior under different rectified waveforms
2017
In this work, a previous software used to simulate partial discharges (PDs) under Alternating Current (AC) stress has been modified in order to evaluate the PDs behavior under a voltage stress close to the Direct Current (DC) waveform. By using a full-wave and a half-wave rectifier, the specimen with an air void defects has been subjected to a gradual constant stress. Finally, a capacitive filter has been inserted in order to produce a steadier voltage supply. Simulation results show that under an almost DC waveform, the PDs activity become less compared to AC stress.
Bandgap behavior and singularity of the domain-induced light scattering through the pressure-induced ferroelectric transition in relaxor ferroelectri…
2018
[EN] In this letter, we have investigated the electronic structure of A(x)Ba(1-x)Nb(2)O(6) relaxor ferroelectrics on the basis of optical absorption spectroscopy in unpoled single crystals with A = Sr and Ca under high pressure. The direct character of the fundamental transition could be established by fitting Urbach's rule to the photon energy dependence of the absorption edge yielding bandgaps of 3.44(1) eV and 3.57(1) eV for A = Sr and Ca, respectively. The light scattering by ferroelectric domains in the pre-edge spectral range has been studied as a function of composition and pressure. After confirming with x-ray diffraction the occurrence of the previously observed ferroelectric to pa…
Contributed Review: Review of thermal methods for space charge measurement.
2016
The space charge accumulation phenomenon has garnered great interest over the last two decades because of the increased use of direct current in high voltage electrical systems. In this context, a significant relevance has been achieved by the thermal methods, used for solid dielectrics. This paper presents a review of this non-destructive measurement system used for the measurement of space charge. The thermal pulse method, the thermal step method, and the laser intensity modulation method are described. For each configuration, the principle of operation, the thicknesses analyzed, and the spatial resolution are described, reporting also the main related applications
Space Charge Measurement under DC and DC Periodic Waveform
2018
In High Voltage systems, Partial Discharges (PDs) monitoring are one of the main diagnostic instrument to evaluate the reliability of the apparatus. Under Alternating Current (AC) stress, PDs detection and recognition techniques are well consolidated. On the contrary, the monitoring of PDs under Direct Current (DC) stress is difficult due to complexities related to the nature of the phenomenon, which cause the beginning of PDs events in proximity of the dielectric breakdown. This problem has been partially overcome by using a continuous Periodic waveform (DCP) with positive average value, as described in a recent published work. Under DC stress, another degradation factor is the Space Charg…