Biogas station

Cílem této práce je popsat technologickou skladbu bioplynových stanic, substráty a proces fermentace.The goal of this thesis is describe the technological composition of biogas stations, substrates and the process of fermentation.

Template-Cut: A Pattern-Based Segmentation Paradigm

We present a scale-invariant, template-based segmentation paradigm that sets up a graph and performs a graph cut to separate an object from the background. Typically graph-based schemes distribute the nodes of the graph uniformly and equidistantly on the image, and use a regularizer to bias the cut towards a particular shape. The strategy of uniform and equidistant nodes does not allow the cut to prefer more complex structures, especially when areas of the object are indistinguishable from the background. We propose a solution by introducing the concept of a "template shape" of the target object in which the nodes are sampled non-uniformly and non-equidistantly on the image. We evaluate it on 2D-images where the object's textures and backgrounds are similar, and large areas of the object have the same gray level appearance as the background. We also evaluate it in 3D on 60 brain tumor datasets for neurosurgical planning purposes.Comment: 8 pages, 6 figures, 3 tables, 6 equations, 51 reference

Cube-Cut: Vertebral Body Segmentation in MRI-Data through Cubic-Shaped Divergences

In this article, we present a graph-based method using a cubic template for volumetric segmentation of vertebrae in magnetic resonance imaging (MRI) acquisitions. The user can define the degree of deviation from a regular cube via a smoothness value Delta. The Cube-Cut algorithm generates a directed graph with two terminal nodes (s-t-network), where the nodes of the graph correspond to a cubic-shaped subset of the image's voxels. The weightings of the graph's terminal edges, which connect every node with a virtual source s or a virtual sink t, represent the affinity of a voxel to the vertebra (source) and to the background (sink). Furthermore, a set of infinite weighted and non-terminal edges implements the smoothness term. After graph construction, a minimal s-t-cut is calculated within polynomial computation time, which splits the nodes into two disjoint units. Subsequently, the segmentation result is determined out of the source-set. A quantitative evaluation of a C++ implementation of the algorithm resulted in an average Dice Similarity Coefficient (DSC) of 81.33% and a running time of less than a minute.Comment: 23 figures, 2 tables, 43 references, PLoS ONE 9(4): e9338

Gas microturbine performance in relation to operational conditions

Tato bakalářská práce se zabývá technologií plynových mikroturbín. První část uvádí hlavní principy kombinované výroby energie. Je popsána konstrukce a vlastnosti mikroturbín spolu s hlavními světovými výrobci a jejich produkty. Následuje porovnání této technologie s plynovými motory. Praktická část se zabývá vlastnostmi mikroturbín při vlivu provozních podmínek. Data od výrobce jsou numericky zpracována v matematickém programu Maple. V poslední části jsou porovnány výsledky experimentálního měření s výsledky vypočítanými.This bachelor thesis is focused on the study of gas microturbine. The first part presents the main principle of cogeneration. Then there is described construction and properties of mi-croturbine technology and states major manufacturers and their products. There is also in-cluded comparison to gas engines. Analytical part makes familiar with microturbine performance in relation to operational conditions. It includes using mathematical software Maple for processing data supplied by the manufacturer. The last part compares the results of experimental measurement with cal-culated results.

Two-cylinder petrol engine with eccentric crank mechanism for passenger vehicles

Tato diplomová práce se zabývá silami v klikovém mechanismu. Cílem této práce je najít vhodnou hodnotu excentricity klikového mechanismu, která bude mít příznivý vliv na velikost a průběh sil, které způsobují třecí ztráty v klikovém mechanismu. Dále řeší vyvážení této excentrické jednotky. V poslední části se zabývá návrhem a pevnostní kontrolou klikového hřídele s uvažováním torzních kmitů.This thesis deals with forces of the crank mechanism. The aim of this work is to find the right value of the eccentricity of the crank mechanism, which will have a positive effect on the size and course of forces that cause friction losses in the crank mechanism. Next solves this balancing eccentric unit. The last part deals with the design and strength check of the crankshaft considering torsional vibration.

Licensing the Use of Grid Services

In this paper, a flexible approach to license the use of WSRF-compliant Grid services as implemented in the Globus Toolkit 4 is presented. A license definition and recombination language which allows to create new licenses on demand in a fine-grained and user dependent manner is introduced. Implementation issues for some components of the proposed licensing system are described