OPTIMALIZATION OF DISTRIBUTION MECHANISM FOR CONTROLLED-DRIVE ROTOR SPINNING MACHINE

katedra: KTS; přílohy: 4 výkresy, 1 CD ROM; rozsah: 52 s., 59s. obr. příloh.This diploma thesis focuses on traversing bar system of rotor spinning machine. The main task is a construction of mathematical model describing the manner of the traversing bar system and design of component units absorbing energy in reversal points of distribution movement. Input characteristics of dural and composite distribution poles were experimentally tested and analysed. The mathematical model is constructed in Pro/Engineer programme and searches for optimal tuning of elastic absorbing units of traversing bar system.Tato diplomová práce se zabývá analýzou a optimalizací soustavy rozváděcí tyče bezvřetenového rotorového dopřádacího stroje. Hlavním cílem je vytvoření matematického modelu popisujícího dynamické chování soustavy rozváděcí tyče a navržení prvků absorbujících energii v úvratích rozváděcího pohybu. Vstupní parametry duralových a kompozitních tyčí byly experimentálně ověřeny a vyhodnoceny. Matematický model je vytvořený v programovém prostředí Pro/Engineer a na základě výsledků z výpočtů hledá optimální naladění pružných absorpčních prvků soustavy rozváděcí tyče

Soil organic matter interactions along the elevation gradient of the James Ross Island (Antarctica)

Around half of the Earth's soil organic carbon (SOC) is presently stored in the Northern Hemisphere permafrost region. In polar permafrost regions, low temperatures particularly inhibit both the production and biodegradation of organic matter. Under such conditions, abiotic factors such as mesoclimate, pedogenic substrate or altitude are thought to be more important for soil development than biological factors. In Antarctica, biological factors are generally underestimated in soil development due to the rare occurrence of higher plants and the short time since deglaciation. In this study, we aim to assess the relationship between SOC and other soil properties related to the pedogenic factors or properties. Nine plots were investigated along the altitudinal gradient from 10 to 320 m in the deglaciated area of James Ross Island (Ulu Peninsula) using a parallel tea-bag decomposition experiment. SOC contents showed a positive correlation with the content of easily extractable glomalin-related soil protein (EE-GRSP; Spearman r=0.733, P=0.031) and the soil buffering capacity (expressed as ΔpH; Spearman r=0.817, P=0.011). The soil-available P was negatively correlated with altitude (Spearman r=-0.711, P=0.032), and the exchangeable Mg was negatively correlated with the rock fragment content (Spearman r=-0.683, P=0.050). No correlation was found between the available mineral nutrients (P, K, Ca and Mg) and SOC or GRSP. This may be a consequence of the inhibition of biologically mediated nutrient cycling in the soil. Therefore, the main factor influencing nutrient availability in these soils does not seem to the biotic environment; rather, the main impact appears to stem from the abiotic environment influencing the mesoclimate (altitude) or the level of weathering (rock content). Incubation in tea bags for 45 d resulted in the consumption and translocation of more labile polyphenolic and water-extractable organic matter, along with changes in the C content (increase of up to +0.53 % or decrease of up to −1.31 % C) and a decrease in the C:N ratio (from 12.5 to 7.1–10.2), probably due to microbial respiration and an increase in the abundance of nitrogen-binding microorganisms. Our findings suggest that one of the main variables influencing the SOC/GRSP content is not the altitude or coarse-fraction content (for which a correlation with SOC/GRSP was not found); rather, we suspect effects from other factors that are difficult to quantify, such as the availability of liquid water.</p

Assessment of thermally stabilized electrospun poly(vinyl alcohol) materials as cell permeable membranes for a novel blood salvage device

The use of Intraoperative Cell Salvage (ICS) is currently limited in oncological surgeries, due to safety concerns associated with the ability of existing devices to successfully remove circulating tumour cells. In this work, we present the first stages towards the creation of an alternative platform to current cell savers, based on the extremely selective immunoaffinity membrane chromatography principle. Non-woven membranes were produced via electrospinning using poly(vinyl alcohol) (PVA), and further heat treated at 180 °C to prevent their dissolution in aqueous environments and preserve their fibrous morphology. The effects of the PVA degree of hydrolysis (DH) (98 % vs 99 %), method of electrospinning (needleless DC vs AC), and heat treatment duration (1-8 h) were investigated. All heat treated supports maintained their cytocompatibility, whilst tensile tests indicated that the 99 % hydrolysed DC electrospun mats were stronger compared to their 98 % DH counterparts. Although, and at the described conditions, AC electrospinning produced fibres with more than double the diameter compared to those from DC electrospinning, it was not chosen for subsequent experiments because it is still under development. Evidence of unimpeded passage of SY5Y neuroblastoma cells and undiluted defibrinated sheep's blood in flow-through filtration experiments confirmed the successful creation of 3D networks with minimum resistance to mass transfer and lack of non-specific cell binding to the base material, paving the way for the development of novel, highly selective ICS devices for tumour surgeries

European integration and establishment of European monetary union

Autor se v práci zabývá vývojem evropské integrace až po vznik Evropské měnové unie v roce 1999. Dále porovnává hospodářský vývoj v EU a v USA.Dokončená práce s úspěšnou obhajobo

Comparison of competition policy of EU member states

Bachelor thesis provides overview of the most influential elements within business competition in the Czech Republic, Belgium, Netherlands, Estonia. Analytical part provides simplified point of view on business competition within chosen countries, which further applied to historical cases of Volkswagen Group and BMW Group