Thesis (M. Sc. (Agriculture)) --University of Limpopo, 2017 / Tea is one of the most popular consumed beverages in the world, which has beneficial properties such as anti-oxidization, anti-carcinoma and preventing arteriosclerosis. The major essential components of catechins present in tea leaves, includes epigallocatechin gallate (EGCG), epigallocatechin (EGC), epicatechin gallate (ECG), epicatechin (EC), gallocatechin (GC) and catechin (C). Influence of time-based hot air drying method on chemical composition of the Jatropha zeyheri Sond, widely consumed in rural communities of Zebediela (Khureng village), Limpopo Province, South Africa, was investigated. Four treatments, namely; 0, 24, 48, and 72 hours, were arranged in completely randomised design (CRD), replicated five times. The study demonstrated that drying significantly increased total phenolic content, total antioxidant capacity and tannin content. It also demonstrated that drying significantly increased minerals elements; Mg, K, P, S, Al, Co, Mn, Si and Zn content and decreased Na, Ca and Ni and Zn quantities. Sodium-potassium ratio was very low across drying periods. Drying time did not significantly influence proximate chemicals; energy, protein, carbohydrates, ash and fibre content. Moisture and fat were significantly increased by drying period. Results of the study suggested that time-based hot air drying method improved the chemical composition of J. zeyheri, which has the potential of enhancing nutrition in marginal rural communities of Limpopo Province.

This thesis focuses on design of device to generate hot air. This generator is supposed to be used to perform thermal tests for a company. Introduction summarizes general knowledge about ventilators, heat transport in air flow, and pressure losses. Main part of the thesis describes development of the generator. Initial design was followed by selection of suitable solution variants, design of major parts of the generator supported by calculations and overall conception of the generator. Final part summarizes the achievements and economic analysis.

An experiential thesis, this document begins at dawn, travels through storms and calm air and ends at night in Argentina. It details the circumstances and influences leading to my thesis exhibition at the Anderson Gallery, including an artist’s statement told through a creative reading of Ray Bradbury’s “All Summer in a Day” and the excitement I found in an out-of-print text on scuba diving.

The influence of uniformity of heat transfer with respect to the effect of heat treatment was investigated by correlating engineering parameters with the quantified heat treatment effects. Differences in treatment effect in terms of quality, anti-pathogen and chilling injury (CI) control properties among commodities was studied by exposing them to different target temperatures. Similar effects were also evaluated and quantified within an individual commodity by a custom-designed device. This device, whose design parameters were based on a heat transfer simulation, insured that one hemisphere of a tomato was exposed to air at 39°C and 0.24 m s-1; while the other hemisphere was exposed to air at a lower temperature with a velocity of0.24 m s-1 or 0.12 m s-1. / Single-temperature heat treatment was most effective in limiting pathogen development and varied according to the parameter measured: 38°C for hypersensitive response (HR), 36°C for tissue breakdown, 36°C, 38°C or 39°C for mycelium abundance, and 38°C or 39°C for lesion size. Bilateral differences in temperature across the fruit significantly affected disease control: decreasing temperature differences significantly improved the uniformity of disease control. / Some of the effects of heat treatment on tomato quality, such as color development and resistance to CI, appear to be localized. A significant difference in redness was identified between heated parts and unheated parts of tomato fruits immediately after treatment; and the differences persisted during storage. Differences in lightness and chroma were noted on day 4. Delay in ripening caused by heat treatment was confirmed through the higher TA and TSS values of heated tomatoes or heated portion of partially heated tomatoes. / The heated parts of tomatoes showed a stronger resistance to chilling injury. The effective temperature control range for CI was wide, but temperatures higher than 39.5°C for 23 h hot air treatment could lead to adverse effects. / Differences in physiological effects between hemispheres in two chambers was reduced by directly decreasing the temperature difference between upper and lower chambers or relatively increasing the heating air flow rate, highlighting the importance of improving the uniformity of air flow around each individual treated fruit.

The main aim of this diploma thesis was to work out a feasibility study. This work was defined by the tourism located in the Trebon area. Next important aims were the opportunity identification at the tourism market in the Trebon area, the determination of the right technical and funded protection of this project and finally the definition of the financial side of the project. The market tourism opportunities in Trebon area were determined by a market exploration which was provided by the questionnaire from my bachelor thesis. I defined the best product of the tourism market which was based on the analyses. By that product, it was the service in sightseeing flight in a hot air balloon. There are some options of the funding. For my project it could be a grant from the South Bohemia region for small and medium business or the grant from the Southwest Regional Operational Program NUTS II in session 2007 ? 2013. Next possibility could be the cooperation with the sponsors.

This thesis describes the design of hot air boilers for burning wood chips for the production of process air at 500 ° C and a given flow rate 2 Nm3 / s. The work deals with general combustion and fuel economy of biomass boilers.

This collection of short stories spans subjects and characters from all around this world and the next. From Himalayan moth girls to swamp princesses and alligator wrestlers, The Ballad of Sparrowfoot offers a unique glimpse inside real and imagined communities and the people who live there. Search for pirate treasure on a magical island, join the cast of fairy tale princesses being raised in a convent, and experience the tribulations of the a bird-footed girl in Louisiana as she searches for her genealogical roots.

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Unblanced forced-air heating systems create a situation that may be detrimental to the building envelope. These systems create an air pressure differential, which acts as a moisture transport mechanism, which has the potential to carry moisture, through the smallest of openings in the building envelope. Once this warm air enters the wall cavity it comes into contact with the unheated surfaces of the components making up the building envelope, which are below dew point during the heating months. As this moisture-laden air reaches its dew point, condensation occurs. / Department of Architecture

Made available in DSpace on 2016-12-08T16:44:48Z (GMT). No. of bitstreams: 1 PGPV14MA153.pdf: 1150046 bytes, checksum: e7bc4d1b84e9aae2e7b26a7688897688 (MD5) Previous issue date: 2014-11-21 / The Thermal Pest Control (TPC) is na implemente that has been used in vineyards throughout Brazil with the aim of replacing chemical treatments. It is based on the principle of stimulating the vine to increase production of phytoalexins by heat. The plant submitted to the TPC is physically stimulated, the heat makes the environment less favorable to the fungal growth, and act as a stressor in the plant mechanisms of self-protection, altering the qualitative parameters of the plant and the fruit. Currently, to the rationalization and otpmization of cultural practices, knowledge of phenological stages is essential for the vine cultivation. Pathogens are a major competitive advantage over those grown vines, which are hundreds of years without genetic changes due to vegetative propagation. This fact is a major cause of epidemics in the vineyards and the rapid emergence of pathogens resistant to fungicides. Being an emerging technology that aims at the gradual replacement of chemical treatments in the vineyards, the presente study aimed to evaluate in chapter one: the productivity and the physicochemical characteristics of Chardonnay grapes subjected to TPC. And in chapter two, the effect of TPC technology on the incidence of escoriose (Phomopsis vitícola), incidence and severity of anthracnose (Elsinoe ampelina) and downy mildew (Plasmopara vitícola).in both chapters were demonstrated the phenological variation under treatment with TPC in vineyard of Chardonnay at conditions of Serra Gaucha, in the municipality of Pinto Bandeira RS. The experimente was performed in cycles 2011/12, 2012/13 and 2013/14 in a comercial vineyard, geographical coordinates: 29 ° 10 S and 51° 31 . Treatments consisted of the use of TPC more contact fungicides; and conventional chemical control Vineyards Chardonnay undergo treatments with the TPC feature productivity 27% less than conventionally treated vineyards. The maturation process is early, there is a reduction in compaction of clusters and increase in leaf área and thickness of the plants. The TPC combined with contact fungides ia as eficient as the conventional chemical treatment when it comes to escoriose, anthracnose and downy mildew. The grape phenology is affected by the use of TPC. For the variety Chardonnay, plants were subjected to treatments with TPC in previous cycles, obtained later budding, a positive feature because of Chardonnay be na early variety, being susceptible to late frosts / A Thermal Pest Control (TPC) é um implemento que tem sido utilizado em vinhedos de todo o Brasil com o objetivo de substituir tratamentos químicos. Baseia-se no princípio de estimular a videira a aumentar a sua produção de fitoalexinas através de calor. A planta submetida ao TPC é estimulada fisicamente. O calor atua tornando o ambiente menos propício ao desenvolvimento de fungos e também, como agente estressante na planta, estimulando os mecanismos de autoproteção vegetal, podendo alterar os parâmetros qualitativos da planta e do fruto. Visando a racionalização e otimização de práticas culturais, o conhecimento dos estádios fenológicos é indispensável para o cultivo da videira. Os agentes patogênicos stão em grande vantagem competitiva em relação às videiras cultivadas, que passam centenas de anos sem mudanças genéticas, devido à propagação vegetativa. Este fato é a maior causa da ocorrência de epidemia nos vinhedos e do rápido aparecimento de patógenos resistentes a fungicidas. Por ser uma tecnologia incipiente, que visa à vinhedos, o presente estudo objetivou avaliar no capítulo um: a produtividade e as características físico-químicas de uvas Chardonnay submetidas à TPC. E no capítulo dois, o efeito da tecnologia TPC sobre a incidência de escoriose (Phomopsis vitícola), incidência e severidade de antracnose (Elsinoe ampelina) e míldio (Plasmopara vitícola). Em ambos os capítulos foi abordada a variação fenológica ocorrida sob tratamento com a TPC no vinhedo, nas condições edafoclimáticas da Serra Gaúcha, no município de Pinto Bandeira RS. O experimento foi executado nos ciclos 2011/12, 2012/13 e 2013/14 em vinhedo comercial, coordenadas geográficas: 29°10 S e 51°31 W. os tratamentos consistiram na utilização da TPC mais fungicidas de contato; e controle químico convencional. Vinhedos de Chardonnay submetidos a tratamentos com a TPC apresentaram produtividade 27% inferior a vinhedos tratados convencionalmente. A maturação das uvas adiantou, houve redução na compactação dos cachos e aumento na área e espessura foliar das plantas. A TPC aliada a tratamentos com fungicidas de contato foi tão eficiente quanto o tratamento químico convencional em se tratando de escoriose, antracnose e míldio. A fenologia da videira foi afetada pela utilização da TPC. Para a variedade Chardonnay, plantas que foram submetidas a tratamentos com TPC nos ciclos anteriores. Obtiveram brotação mais tardia, característica positiva pelo fato da Chardonnay ser uma variedade precoce, sendo suscetível a geadas tardias