Possibilities of using of ultra fine content of fly ash from clasical coal combustion

Tato práce se zabývá studiem vysoce jemných podílů popílků z klasického spalování uhlí. Soustřeďuje se hlavně na zjištění vlastností stanovovaných popílků – pucolánové aktivity, chemického složení, distribuce velikosti částic a měrného povrchu. Možnosti využití těchto popílků byly studovány přípravou cementových směsí s těmito popílky a následným hodnocením fyzikálních vlastností a fázového složení vzniklých kompozitů. Fázové složení bylo zjišťováno pomocí rentgenové práškové difrakce.This thesis deals with the study of ultra fine content of fly ash from clasical coal combustion. It focuses mainly on the determination of properties of the fly ash – pozzolanic activity, chemical composition, particle size distribution and specific surface area. Possibilities of use of these fly ash were studied by preparation of cement mixtures with the fly ash and subsequent evaluation of physical properties and phase composition of the resulting composites. Phase composition was examined by x-ray powder diffraction.

Geometrical Image Transforms

Cílem bakalářské práce je nastudování základů zpracování obrazu, především pak lineárních transformací obrazu a interpolací obrazových bodů. Za účelem bližšího seznámení je vhodné provést implementaci základních geometrických transformací a alespoň několika druhů různých interpolačních metod.This bachelor's thesis is about introducing to basics of image processing, mostly with linear image transformations and interpolation. For the purpose of the closer understanding is properly to implement some basic geometrical image transformations and some different interpolation methods.

Moving Objects Detection in Video Sequences

Tato práce se zabývá problematikou rozpoznávání a detekce objektů a osob ve video sekvenci i ve statickém obraze. Navržená aplikace využívá kombinaci detekce pohybu pomocí background modelu, rozpoznání osob pomocí histogramů orientovaných gradientů a sledování objektů pomocí Lucas-Kanadeho metody.The topic of this thesis is the recognition and detection of moving object and persons in video sequence and in the static image. Designed application uses the combination of background model for movement detection, histograms of oriented gradients method for person recognition and Lucas-Kanade method for object tracking.

Texture Synthesis

Práce čtenáři objasní význam texturování a obsahuje přehled základních postupů při syntetizování textur. Generování textur je popsáno především z pohledu procedurálních generátorů. Vysvětlen je význam použití Fourierovy transformace a její zjednodušené verze, diskrétní kosinové transformace. Při modifikacích textur je použit Gaussův šum a Gaussův filtr. Pro mísení textur je v práci použit konvoluční teorém. V rámci práce je také popsán návrh a implementace aplikace, která umožňuje experimentovat s vytvářením textur.This thesis deals with texturing, its importance and basic list of the processes during texture synthetising is included. Texture generating is mainly described from the procedural generator point of view. There is also explained the sense of using Fourier's transformation and its simplified version, the discreet cosine transformation. For texture modiffication, Gaussian noise and gaussian filter is used. The convolution theorem is applied for the texture mixing. Within the scope of this thesis, there is also described the application implementation, which enables experimenting with texture creating.

Radio-frequency electric field generated by vibration modes of a microtubule

Katedra elektromagnetického pol

Production of assembly jigs by Fused Deposition Modeling method

Bakalářská práce se zabývá návrhem a výrobou montážních přípravků pro výrobu LCD televizorů ve firmě Wistron Infocomm (Czech), s. r. o. V rámci práce proběhlo zhodnocení současného stavu používání montážních přípravků a následný návrh a tvorba prototypů dvou montážních přípravků. Do práce je zahrnuto jejich testování, volba způsobu výroby, jejich nasazení v běžné produkci a vyhodnocení výsledků. Součástí práce je literární studie popisující technologie RapidPrototyping a její jednotlivé metody.This bachelor thesis describes the design and manufacture of assembly jigs for the production of LCD TVs in the company Wistron Infocomm (Czech), s. r. o. In the thesis was carried out to assess the current status of use of assembly jigs, design and creation of two prototypes of assembly jigs. The work includes testing, choice of method of manufacture, their routine use in the production and evaluation of results. The work also include literary studies describing RapidPrototyping technology and its various methods.

Principles and types of hydrodynamic valves

Bakalářská práce se zabývá charakteristikou nejpoužívanějších ventilů v hydraulických systémech. Cílem práce bylo udělat základní přehled dostupných prvků a vymezit jejich stručnou charakteristiku. Důraz byl kladen zejména na jejich funkci a principy plnění daného úkolu v hydraulickém obvodu. Druhá část této práce řeší problém kmitání u ventilů a následnou optimalizace konstant, které plní funkci tlumení.This thesis deals with characteristics of the most commonly used valves in hydraulic systems. The aim was to create an overview of available features and define their brief characteristics. The emphasis was placed on their function and principles of task performance in a hydraulic circuit. The second part of the thesis is aimed at solving the issue of valves oscillation and subsequent optimization of constants that function as factor dampping.

Molecular cytogenetic differentiation of paralogs of Hox paralogs in duplicated and re-diploidized genome of the North American paddlefish (Polyodon spathula).

BackgroundAcipenseriformes is a basal lineage of ray-finned fishes and comprise 27 extant species of sturgeons and paddlefishes. They are characterized by several specific genomic features as broad ploidy variation, high chromosome numbers, presence of numerous microchromosomes and propensity to interspecific hybridization. The presumed palaeotetraploidy of the American paddlefish was recently validated by molecular phylogeny and Hox genes analyses. A whole genome duplication in the paddlefish lineage was estimated at approximately 42 Mya and was found to be independent from several genome duplications evidenced in its sister lineage, i.e. sturgeons. We tested the ploidy status of available chromosomal markers after the expected rediploidization. Further we tested, whether paralogs of Hox gene clusters originated from this paddlefish specific genome duplication are cytogenetically distinguishable.ResultsWe found that both paralogs HoxA alpha and beta were distinguishable without any overlapping of the hybridization signal - each on one pair of large metacentric chromosomes. Of the HoxD, only the beta paralog was unequivocally identified, whereas the alpha paralog did not work and yielded only an inconclusive diffuse signal. Chromosomal markers on three diverse ploidy levels reflecting different stages of rediploidization were identified: quadruplets retaining their ancestral tetraploid condition, semi-quadruplets still reflecting the ancestral tetraploidy with clear signs of advanced rediploidization, doublets were diploidized with ancestral tetraploidy already blurred. Also some of the available microsatellite data exhibited diploid allelic band patterns at their loci whereas another locus showed more than two alleles.ConclusionsOur exhaustive staining of paddlefish chromosomes combined with cytogenetic mapping of ribosomal genes and Hox paralogs and with microsatellite data, brings a closer look at results of the process of rediploidization in the course of paddlefish genome evolution. We show a partial rediploidization represented by a complex mosaic structure comparable with segmental paleotetraploidy revealed in sturgeons (Acipenseridae). Sturgeons and paddlefishes with their high propensity for whole genome duplication thus offer suitable animal model systems to further explore evolutionary processes that were shaping the early evolution of all vertebrates

Life Sciences Data Archive (LSDA) in the Post-Shuttle Era

Now, more than ever before, NASA is realizing the value and importance of their intellectual assets. Principles of knowledge management, the systematic use and reuse of information/experience/expertise to achieve a specific goal, are being applied throughout the agency. LSDA is also applying these solutions, which rely on a combination of content and collaboration technologies, to enable research teams to create, capture, share, and harness knowledge to do the things they do well, even better. In the early days of spaceflight, space life sciences data were been collected and stored in numerous databases, formats, media-types and geographical locations. These data were largely unknown/unavailable to the research community. The Biomedical Informatics and Health Care Systems Branch of the Space Life Sciences Directorate at JSC and the Data Archive Project at ARC, with funding from the Human Research Program through the Exploration Medical Capability Element, are fulfilling these requirements through the systematic population of the Life Sciences Data Archive. This project constitutes a formal system for the acquisition, archival and distribution of data for HRP-related experiments and investigations. The general goal of the archive is to acquire, preserve, and distribute these data and be responsive to inquiries from the science communities