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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

An Application of Sequence Stratigraphy in Modelling Oil Yield Distribution: The Stuart Oil Shale Deposit, Queensland, Australia

Pope, Graham John January 2005 (has links)
The Stuart Oil Shale Deposit is a major oil shale resource located near Gladstone on the central Queensland coast. It contains an estimated 3.0 billion barrels of oil in place in 5.6 billion tonnes of shale. Commissioning of a plant capable of producing 4,500 barrels per day has recently commenced. The shale is preserved in Tertiary age sediments of The Narrows Beds in the southern part of The Narrows Graben. The oil shale sequence consists of repetitive cycles composed of oil shale, claystone and lesser carbonaceous oil shale in the 400 metre thick Rundle Formation. The formation is the main oil-shale bearing unit in the preserved half-graben sequence up to 1,000 metres thick. Previous studies on the lacustrine sedimentology of the Rundle Oil Shale Deposit in the northern part of The Narrows Graben have recognised eight facies that exhibit unique and recognisable cycles. The cycles and sequence for the Kerosene Creek Member of the Rundle Formation is correlatable between the Rundle and Stuart deposits. The nature of these facies and the cycles is reviewed in some detail. In conjunction with the principles of sequence stratigraphy, the ideal oil shale cycle is described as the equivalent of a parasequence within a lacustrine system. The lacustrine parasequence is bounded by lacustrine flooding surfaces. The organic material in the oil shale consists of both Type I (algal dominated) and Type III (higher plant matter dominated) kerogen. Where Type I kerogen dominate, oil yields greater than about 100 litres per tonne are common. In contrast where Type III kerogens are dominant, yields above 100 litres per tonne are rare. The variation in oil yield is described for the Stuart lacustrine system. The variation is consequent on the balance between production, preservation and degradation of the kerogen in the parasequences within systems tracts. A system for the recognition of oil shale deposition in terms of lacustrine systems tracts is established based on oil yield assay parameters and the assay oil specific gravity. The oil yield and oil specific gravity variation within the Rundle Formation is modelled by member and the nature and distribution of oil yield quality parameters in terms of the contribution of organic and inorganic source material are described. The presence of significant oil yield (greater than 50 litres per tonne) is dependent on the dominance of lacustrine transitional systems tracts and to a lesser extent, lacustrine highstand systems tracts within the parasequence sets deposited in a balanced lake system in a generally warm wet climate during the middle to late Tertiary.
12

Produtividade e teor de óleo para genótipos de soja em três épocas de semeadura / Yield and oil contents in soybean genotypes in three sowing dates

Lélis, Marcelo Magri 18 December 2007 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Sowing date is one of the factors that most affect soybean (Glycine max (L.) Merrill) performance due to changes in climate variables to which the culture is very sensitive. This study evaluated the effect of three sowing dates on soybean genotypes yield and oil contents, in Uberlândia-MG. The experimental design was randomized blocks, with split plots, with three repetitions. The experimental units were attributed to sowing dates (31 October, 22 November, and 14 December 2006) and the split plots to the genotypes (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU-6, UFU-7, UFU- 8, UFU-9, UFU-10, Conquista and Garantia). The randomized experimental unit (plot) was composed of the genotypes, also randomly. The split plot consisted of a 5-m row sown, with 4 m used for the evaluations. The parameters evaluated were: flower color, number of days for flowering (NDF), plant height at flowering (APF), plant height at maturation (APM), stand, leaf retention (RF), lodging (ACM), height of first pod insertion (AIPV), rust severity (SF), weight of 100 beans (PCG) and yield. The oil contents was evaluated only in genotypes Impacta, Guarani, Riqueza, Milionária, Xavante, Conquista and Garantia. The parameters evaluated were SF, PCG, oil contents, yield and oil yield. Sowing in December gave the lowest bean yield. The genotypes Milionária, UFU-6, UFU-7 and UFU-8 had the greatest yield. The cultivars Guarani, Milionária and Xavante, were the most promising genotypes for oil yield. CHAPTER 3: The performance of soybean (Glycine max (L.) Merrill) genotypes subjected to different sowing dates can have great changes due to the major effect of climatic conditions on the culture. This study evaluated the agricultural performance of different soybean genotypes in three sowing dates, in Uberlândia-MG. The experimental design was randomized blocks, with split plots, with three repetitions. The experimental units were attributed to sowing dates (31 October, 22 November, and 14 December 2006) and the split plots to the genotypes (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU6, UFU-7, UFU-8, UFU-9, UFU-10, Conquista and Garantia). The randomized experimental unit (plot) was composed of the genotypes, also randomly. The split plot consisted of a 5-m row sown, with 4 m used for the evaluations. The parameters evaluated were: flower color, number of days for flowering (NDF), plant height at flowering (APF), plant height at maturation (APM), stand, leaf retention (RF), lodging (ACM), height of first pod insertion (AIPV), rust severity (SF), weight of 100 beans (PCG) and yield. Sowing in December gave the lowest bean yield. The genotypes Milionária, UFU-6, UFU-7 and UFU-8 had the greatest yield. CHAPTER 4: The performance of soybean (Glycine max (L.) Merrill) genotypes subjected to different sowing dates can have great changes due to the major effect of climatic conditions on the culture. This study evaluated the effect of three sowing dates on the oil contents of different soybean genotypes, in Uberlândia-MG. The experimental design was randomized blocks, with split plots, with three repetitions. The experimental units were attributed to sowing dates (31 October, 22 November, and 14 December 2006) and the split plots to the genotypes (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU-6, UFU-7, UFU-8, UFU-9, UFU-10, Conquista and Garantia). The randomized experimental unit (plot) was composed of the genotypes, also randomly. The split plot consisted of a 5-m row sown, with 4 m used for the evaluations. Theparameters evaluated were: rust severity (SF), weight of 100 beans (PCG) oil contents, yield and oil yield. Sowing in December gave the lowest oil yield. The cultivars Guarani, Milionária and Xavante, were the most promising genotypes for acceptable oil yield per area. / A época de semeadura é um dos fatores que mais influencia no desempenho da soja (Glycine max (L.) Merrill), em função de alterações nas variáveis climáticas das quais a cultura é sensível. Objetivou-se estudar o efeito de três épocas de semeadura na produtividade e no teor de óleo para genótipos de soja, nas condições de Uberlândia- MG. O delineamento foi o de blocos casualizados, em esquema de parcela subdividida, com três repetições. As parcelas foram atribuídas às épocas de semeadura (31/10, 22/11 e 14/12/06) e as subparcelas aos genótipos (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU-6, UFU-7, UFU-8, UFU-9, UFU- 10, Conquista e Garantia). A unidade experimental (parcela) casualizada foi composta pelos genótipos dispostos também de forma casualizada. A subparcela foi constituída por uma fileira de semeadura de 5 m, aproveitando-se os 4 m centrais. Foram avaliados: cor de flor, número de dias para floração (NDF), altura da planta na floração (APF), altura da planta na maturação (APM), stand , retenção foliar (RF), acamamento (ACM), altura de inserção da primeira vagem (AIPV), severidade de ferrugem (SF), peso de 100 grãos (PCG) e produtividade. Quanto ao teor de óleo, foram considerados somente os genótipos Impacta, Guarani, Riqueza, Milionária, Xavante, Conquista e Garantia. Nestes, avaliou-se SF, PCG, teor de óleo, produtividade e produtividade de óleo. Constatou-se que a semeadura realizada em dezembro, foi a que proporcionou menor rendimento de grãos. Os genótipos Milionária, UFU-6, UFU- 7, UFU-8, resultaram nas maiores produtividades. As variedades Guarani, Milionária e Xavante, apresentaram-se como os genótipos mais promissores para o rendimento de óleo. CAPITULO 3: O comportamento de genótipos de soja (Glycine max (L.) Merrill) submetidos à diferentes épocas de semeadura pode sofrer grandes alterações, devido a grande influência das condições climáticas sobre a cultura. Objetivou-se com este trabalho verificar o comportamento agronômico de diferentes genótipos de soja em três épocas de semeadura, nas condições de Uberlândia-MG. O delineamento foi o de blocos casualizados, em esquema de parcela subdividida, com três repetições. As parcelas foram atribuídas às épocas de semeadura (31/10, 22/11 e 14/12/06) e as subparcelas aos genótipos (Impacta, Guarani, Riqueza, Milionária, Xavante, UFU-6, UFU-7, UFU-8, UFU-9, UFU-10, Conquista e Garantia). A unidade experimental (parcela) foi composta pelos genótipos. A subparcela foi constituída por uma fileira de semeadura de 5 m, aproveitando-se os 4 m centrais. Foram avaliados: número de dias para floração (NDF), altura da planta na floração (APF), altura da planta na maturação (APM), stand , retenção foliar (RF), acamamento (ACM), altura de inserção da primeira vagem (AIPV), severidade de ferrugem (SF), peso de 100 grãos (PCG) e produtividade. Verificou-se que a semeadura realizada em dezembro foi a que proporcionou menor produtividade de grãos. Os genótipos Milionária, UFU-6, UFU-7, UFU-8, resultaram nas maiores produtividades. CAPITULO 4: A época de semeadura é um dos fatores que mais influencia no desempenho da soja (Glycine max (L.) Merrill), em função das alterações das variáveis climáticas das quais a cultura é sensível. Este trabalho teve o objetivo de estudar o efeito de três épocas de semeadura no teor de óleo para genótipos de soja, nas condições de Uberlândia-MG. O delineamento foi o de blocos casualizados, em esquema de parcela subdividida, com três repetições. As parcelas foram atribuídas às épocas de semeadura (31/10, 22/11 e 14/12/06) e as subparcelas aos genótipos (Impacta, Guarani, Riqueza, Milionária, Xavante, Conquista e Garantia). A unidade experimental (parcela) foi composta pelos genótipos. A subparcela foi constituída por uma linha de semeadura de 5 m, aproveitando-se os 4 m centrais. Foram avaliados: severidade de ferrugem (SF), peso de 100 grãos (PCG), teor de óleo, produtividade e produtividade de óleo. A semeadura realizada nos mês de dezembro proporcionou um menor rendimento do teor de óleo. As variedades Guarani, Milionária e Xavante apresentaram-se como as mais promissoras para a obtenção satisfatória da quantidade de óleo por área. / Mestre em Agronomia
13

Mogućnosti korišćenja energije pirolizom poljoprivredne biomase / The possibilities for application of energy from agricultural biomass pyrolysis

Brankov Saša 10 April 2017 (has links)
<p>U doktorskoj disertaciji realizovano je istraživanje mogućnosti konverzije energije različitih vrsta poljoprivredne biomase procesom pirolize. Ispitivanu poljoprivrednu biomasu predstavljale su p&scaron;enična, ovsena, sojina slama, slama od kukuruzovine kao i me&scaron;avina navedenih slama. Dobijeni eksperimentalni rezultati ukazuju da prinos gasa, tečne i čvrste faze tokom odvijanja procesa pirolize zavise od vi&scaron;e parametara vođenja procesa među kojima dominantan uticaj imaju reakciono vreme, temperatura i brzina<br />zagrevanja.</p> / <p>Doctoral dissertation investigates possibilities for energy conversion of different agricultural biomass types through pyrolysis process. Investigated agricultural biomass included wheat, corn, oat, soy straw and the mixture of mentioned straws. Obtained experimental results imply that gas, liquid and solid phase yields during pyrolysis process depend on various process parameters, where the reaction time, temperature and heating rate have dominant influence.</p>
14

Uticaj kvaliteta semena na dinamiku razvoja, prinosi kvalitet suncokreta / The effect of seed quality on the developmentaldynamics, yield and quality of sunflower

Mrđa Jelena 30 December 2015 (has links)
<p>Izvod<br />IZ<br />Pet hibrida suncokreta (Sremac, Oliva, Cepko, NS-H-111 i Sumo 2 OR) gajena su tokom<br />vegetacionih sezona 2010. i 2011. godine na oglednom polju Instituta za ratarstvo i<br />povrtarstvo, Novi Sad, na Rimskim &scaron;ančevima i na oglednom polju Poljoprivredne stručne<br />službe Zrenjanin. Laboratorijski deo ogleda izveden je u Laboratoriji za ispitivanje semena<br />Instituta za ratarstvo i povrtarstvo iz Novog Sada i Biohemijskoj laboratoriji<br />Poljoprivrednog fakulteta u Novom Sadu. Cilj istraživanja je bio da se utvrdi da li semenski<br />materijal, poreklom sa istog lokaliteta i iste parcele, u procesu dorade semena tj. odvajanja<br />semena po frakcijama menja kvalitet, kao i da li ovakav način dorade semenskog materijala<br />utiče na prinos i komponente prinosa semena, kao i na sadržaj i prinos ulja odabranih<br />hibrida suncokreta. Takođe, cilj je bio i da se utvrdi da li nedostatak primarnog korena kod<br />ponika suncokreta dovodi do statistički značajnog smanjenja prinosa semena i ulja, kao i<br />kakav uticaj ima na komponente prinosa suncokreta. Analizirane su sledeće osobine:<br />klijavost i vigor semena, enzimska aktivnost, nicanje u polju, nakupljanje suve materije (po<br />biljnim organima i ukupno po biljci), visina stabla, prečnik glave, prinos semena, masa 1000<br />semena, sadržaj ulja i prinos ulja. Statistička obrada podataka izvr&scaron;ena je primenom analize<br />varijanse trofaktorijalnog ogleda, prema modelu podeljenih parcela. Iz tabele analize<br />varijanse je prikazana verovatnoća značajnosti razlika po F-testu, a na osnovu uče&scaron;ća u<br />sumi kvadrata tretmana određen je procentualni udeo svakog faktora u ukupnoj<br />varijabilnosti. Takođe su izračunate i LSD vrednosti za poređenje razlika između tretmana<br />posmatranog faktora, na pragovima značajnosti od 1 i 5%. Utvrđena je i korelaciona<br />zavisnost posmatranih osobina. Rezultati analize varijanse pokazali su visoko značajno<br />uče&scaron;će glavnih faktora (godine, lokaliteta, frakcije semena, tipa ponika), kao i njihovih<br />međusobnih interakcija za većinu ispitivanih osobina. Na vrednosti ispitivanih osobina<br />najveći uticaj imala je godina istraživanja, a zatim lokalitet. Frakcija semena je imala visoko<br />značajan uticaj na klijavost semena, nicanje u polju, nakupljanje suve materije, prinos<br />semena i prinos ulja. Tip ponika je imao visoko značajan uticaj na enzimsku aktivnost</p> / <p>Five sunflower hybrids (Sremac, Oliva, Cepko, NS-H-111, and Sumo 2 OR) were grown in<br />2010 and 2011, on experimental fields of the Institute of Field and Vegetable Crops Novi<br />Sad - Rimski &Scaron;ančevi, and experimental fields of the Agricultural Service Zrenjanin.<br />Laboratory tests were conducted at Laboratory for Seed Testing of the Institute of Field<br />and Vegetable Crops Novi Sad, and Biochemical Laboratory of the Faculty of Agriculture,<br />University of Novi Sad. The aim of this research was to determine whether seed material<br />from the same locality and the same field lot changes quality during seed processing, i.e.<br />dividing seed lot into fractions, and additionally whether this type of seed processing<br />affects seed yield, seed yield components, oil yield, and oil content of the selected<br />sunflower hybrids. The aim was also to determine if missing primary root in sunflower<br />seedlings results in statistically significant decrease of seed and oil yield, and establish how<br />it influences sunflower yield components. The following traits were examined: seed<br />germination and vigour, enzymatic activity, field emergence, dry matter accumulation (in<br />plant organs and in the whole plant), stem height, head diameter, seed yield, 1000 seed<br />mass, oil content and oil yield. Statistical analysis of data was performed by analysis of<br />variance of the trifactorial trial using the split-plot design model. Table of analysis of<br />variance shows the probability of significance of differences by F-test, and based on the<br />participation in the treatment sum of squares, percentage ratio of each factor was<br />calculated in the total variability. LSD values at 1 and 5% were computed to compare<br />differences between treatments of the observed factor. Correlation dependence between<br />the observed traits was determined. Results of the analysis of variance showed a highly<br />significant participation of the main factors (year, locality, seed fraction, type of seedling),<br />and their mutual interactions for the majority of the examined traits. Year and locality had<br />the highest effect on the value of the examined traits. Seed fraction had highly significant<br />effect on seed germination, emergence, dry matter accumulation, seed yield, and oil yield.<br />Type of seedling had a highly significant effect on the enzymatic activity, seed yield, oil<br />content, and oil yield.</p>

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