Low Carbon technology in the Distribution Network

Každý rok mají obnovitelné zdroje větší dopad a více pronikají do distrubučních sítí. Tato diplomová práce podrobně popisuje tři nejčastěji využívané obnovitelné zdroje energie v současnosti - solární, větrnou a vodní. Pracovní principy každého obnovitelného zdroje byly popsány z hlediska fyziky, stejně tak jako podrobnosti o technologiích, které jsou v současné době používány v průmyslu. Tato práce se soutředila na výrobu sluneční energie, neboť tato výroba byla zdrojem v případové studii. Případová studie zahrnovala komplexní simulační analýzu scénáře reálného života nízkonapěťového distribučního systému v Nymburku s malými solárními fotovoltaickými články. Simulace byla provedena pomocí simulačního softwaru eVlivy. Cílem studie bylo sledovat a analyzovat vliv mnoha soukromých fotovoltaických článku v rezidenční oblasti na distribuční síť a její zařízení.Renewable energy sources are having larger impact and penetration every year in distribution networks. This thesis discusses in detail the current three most commonly used renewable energy sources; solar, wind and hydro. Every renewable source had its working principles described from a physics point of view as well as giving details on technologies that are being used currently in the industry. The focus of this thesis was on solar power generation as this was the generating source in the case study. The case study included a comprehensive simulation analysis of a real life scenario of a low voltage distribution system in Nymburk with small solar photovoltaic cells included. The simulation was done with the help of the simulation software eVlivy. The studies goals were to observe and analyse the effect of many private photovoltaic cells in a residential area on the distribution grid and its equipment

Stemmer for Serbian language

In linguistic morphology and information retrieval, stemming is the process for reducing inflected (or sometimes derived) words to their stem, base or root form; generally a written word form. In this work is presented suffix stripping stemmer for Serbian language, one of the highly inflectional languages.Comment: 16 pages, 8 figures, code include

Forward jet-like event spin-dependent properties in polarized p+p collisions at s\sqrt{s}=200 GeV

The STAR collaboration has reported precision measurements on the transverse single spin asymmetries for the production of forward $\pi^0$ mesons from polarized proton collisions at $\sqrt{s} =\,$200 GeV. To disentangle the contributions to forward asymmetries, one has to look beyond inclusive $\pi^0$ production to the production of forward jets or direct photons. Present forward detector capabilities are not well matched to the complete reconstruction of forward jets, but do have sufficient acceptance for "jet-like" events. "Jet-like" events are the clustered response of an electromagnetic calorimeter that is primarily sensitive to incident photons, electrons and positrons. During the RHIC running in the year 2006, STAR with the Forward Pion Detector (FPD++) in place collected 6.8 pb$^{-1}$ of data with an average polarization of 60%. FPD++ was a modular detector prototype of the Forward Meson Spectrometer (FMS) that consisted of two detectors placed symmetrically with respect to the beam line at a distance of 7.4 m from the interaction point. Readout of the FPD++ was triggered when the sum of energies in the central module of the calorimeter used for $\pi^0$ measurements was larger than a threshold. This trigger minimizes the bias for "jet-like" events, making it appropriate to disentangling contributions to the forward transverse spin asymmetries. We report on the status of the analysis.Comment: 5 pages, 6 figures, SPIN10 conference (Juelich, Germany, 2010

Recurrence and transience property for a class of Markov chains

We consider the recurrence and transience problem for a time-homogeneous Markov chain on the real line with transition kernel $p(x,\mathrm{d}y)=f_x(y-x)\,\mathrm{d}y$, where the density functions $f_x(y)$, for large $|y|$, have a power-law decay with exponent $\alpha(x)+1$, where $\alpha(x)\in(0,2)$. In this paper, under a uniformity condition on the density functions $f_x(y)$ and an additional mild drift condition, we prove that when $\lim\inf_{|x|\longrightarrow\infty}\alpha(x)>1$, the chain is recurrent. Similarly, under the same uniformity condition on the density functions $f_x(y)$ and some mild technical conditions, we prove that when $\lim\sup_{|x|\longrightarrow\infty}\alpha(x)<1$, the chain is transient. As a special case of these results, we give a new proof for the recurrence and transience property of a symmetric $\alpha$-stable random walk on $\mathbb {R}$ with the index of stability $\alpha\in(0,1)\cup(1,2).$Comment: Published in at http://dx.doi.org/10.3150/12-BEJ448 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm