Study on properties of geopolymers for application in transport means

Disertační práce je věnovaná studiu alkalicky aktivovaných materiálů na bázi elektrárenského popílku, zejména možnosti jejich využití jako vysokoteplotních tmelů pro aplikace v dopravní technice. Adheze geopolymerů s kovem nebyla dodnes široce studovaná. Tato práce je zaměřena zejména na vyhledávání optimálního složení tmelu, které by odpovídalo požadavkům na vysokoteplotní tmely a kromě toho aby byly cenově srovnatelné podobnými materiály již existujícími na trhu.This doctoral thesis deals with a study of alkali activated materials based on fly ash, above all the possibility of their application as high temperature sealants in transport means. Adhesive bonding of geopolymers with steel haven?t been studied widely till nowadays. This work is mainly concentrated on optimal sealant composition search, which would respond to main requirements to high temperature sealants, besides would have a competitive price in comparison with the similar materials existent in the market.Katedra mechaniky, materiálů a částí strojůPrezentace doktorské dizertační práce Přečtení posudků Odpovědi na připomínky oponentů Rozprava Tajné hlasování Vyhlášení výsledku tajného hlasován

Tolerances as images of congruences in varieties defined by linear identities

An identity s=t is linear if each variable occurs at most once in each of the terms s and t. Let T be a tolerance relation of an algebra A in a variety defined by a set of linear identities. We prove that there exist an algebra B in the same variety and a congruence Theta of B such that a homomorphism from B onto A maps Theta onto T.Comment: 3 page

Virtual Interactive Walk through Scenery

Tato bakalářská práce se zabývá problematikou modelování krajiny v OpenGL. Obsahuje teoretický princip vykreslování ve 3D pomocí funkcí OpenGL a popis některých technologií sloužících k modelování realistických objektů a efektů. Tyto technologie jsou demonstrovány na aplikaci modelující interaktivní procházku krajinou, která je nakonec otestována pomocí dotazníků, vyplněných skupinou dobrovolníků.This bachelor's thesis describes the issues of modelling a scenery in OpenGL. It contains theoretical principle of 3D displaying with OpenGL functions and description of some of the technologies made for realistic objects and efects modelling. These technologies are demonstrated on an application modelling an interactive walk through scenery, which is eventually tested with questionnaires, filled by a group of volunteers.

Comparison of qualitative properties of NURBS interpolation curves

Tato práce se zabývá prostými interpolačními křivkami, které jsou ukotvené. Konstrukce těchto křivek je řešena několika tvarovacími metodami. Také je uveden postup jejich výpočtu. Výsledkem je porovnání různých interpolačních metod. Práce je užitečná k porozumění interpolačních NURBS křivek a k výběru vhodných tvarovacích metod.This thesis deals with simple interpolation curves, which are clamped. Construction of the curves is solved by several forming tools. There is also brought procedure of their calculation. Result is comparating different interpolation methods. The thesis is useful to understanding for interpolation NURBS curves and for choosing apposite forming methods.

Modelling the probability density function of IPTV traffic packet delay variation

This article deals with modelling the Probability density function of IPTV traffic packet delay variation. The use of this modelling is in an efficient de-jitter buffer estimation. When an IP packet travels across a network, it experiences delay and its variation. This variation is caused by routing, queueing systems and other influences like the processing delay of the network nodes. When we try to separate these at least three types of delay variation, we need a way to measure these types separately. This work is aimed to the delay variation caused by queueing systems which has the main implications to the form of the Probability density function

Efficiency of fat deposition from nonstarch polysaccharides, starch and unsaturated fat in pig

The aim was to evaluate under protein-limiting conditions the effect of different supplemental energy sources: fermentable NSP (fNSP), digestible starch (dStarch) and digestible unsaturated fat (dUFA), on marginal efficiency of fat deposition and distribution. A further aim was to determine whether the extra fat deposition from different energy sources, and its distribution in the body, depends on feeding level. A total of fifty-eight individually housed pigs (48 (sd 4) kg) were used in a 3 x 2 factorial design study, with three energy sources (0.2 MJ digestible energy (DE)/kg0.75 per d of fNSP, dStarch and dUFA added to a control diet) at two feeding levels. Ten pigs were slaughtered at 48 (sd 4) kg body weight and treatment pigs at 106 (sd 3) kg body weight. Bodies were dissected and the chemical composition of each body fraction was determined. The effect of energy sources on fat and protein deposition was expressed relative to the control treatments within both energy intake levels based on a total of thirty-two observations in six treatments, and these marginal differences were subsequently treated as dependent variables. Results showed that preferential deposition of the supplemental energy intake in various fat depots did not depend on the energy source, and the extra fat deposition was similar at each feeding level. The marginal energetic transformation (energy retention; ER) of fNSP, dStarch and dUFA for fat retention (ERfat:DE) was 44, 52 and 49 % (P>0.05), respectively. Feeding level affected fat distribution, but source of energy did not change the relative partitioning of fat deposition. The present results do not support values of energetic efficiencies currently used in net energy-based system

Metódy dedukcie a indukcie v spoločenskovednej metodológii

Článok porovnáva chápanie metód dedukcie a indukcie, s ktorým pracujú vybrané texty zo spoločenskovednej metodológie, s poňatím týchto metód, o ktoré sa opiera moderná logika. Ukazuje, že viaceré príručky spoločenskovedného výskumu vychádzajú zo zastaranej koncepcie, podľa ktorej dedukcia predstavuje „postup od všeobecného k jednotlivému" a indukcia „postup od jednotlivého k všeobecnému". V niektorých prípadoch sa tiež obe metódy chybne stotožňujú s metódami výstavby teórie, prípadne sa dvojica dedukcia - indukcia mylne spája s dvojicou kvantitatívny - kvalitatívny výskum. Článok upozorňuje na niektoré problematické dôsledky takého postupu a navrhuje jednoduché riešenia