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Dissertations / Theses on the topic 'Nitrate minerals'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 July 2025

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1

Dhakal, Prakash. "ABIOTIC NITRATE AND NITRITE REACTIVITY WITH IRON OXIDE MINERALS." UKnowledge, 2013. http://uknowledge.uky.edu/pss_etds/30.

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Under iron (Fe3+)-reducing conditions where aqueous Fe2+ and unreduced solid Fe3+-oxides commonly coexist, soil Fe2+ oxidation has been shown to be coupled with nitrate (NO3-) reduction. One possible secondary reaction is the involvement of NO3- and nitrite (NO2-) with Fe-oxide minerals found in many natural environments. Yet, spectroscopic measurements and kinetic data on reactivity of NO3- and NO2- with Fe-containing oxide minerals such as goethite (a-FeOOH), and magnetite (Fe3O­4) are not found in the literature. The reactivity of goethite and magnetite with NO3- and NO2- was studied over a
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2

Grabb, Kalina C. "Stable Isotope Systematics of Abiotic Nitrate and Nitrite Reduction Coupled With Anaerobic Iron Oxidation: the Role of Reduced Clays and Fe-Bearing Minerals." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17417576.

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Under anaerobic conditions, it is widely assumed that nitrate (NO3-) and nitrite (NO2-) reduction is primarily the result of microbial respiration (Burgin and Hamilton, 2007; Granger et al., 2008). However, it is also proven that the abiotic reduction of nitrate and nitrite by reduced iron(II) (Fe(II)), whether mineral-bound or surface-associated, may also occur under certain environmentally relevant conditions (Chao and Kroontje, 1966; Straub et al., 1996; Picardal, 2012,). With a range of experimental conditions, nitrogen and oxygen stable isotope systematics of abiotic nitrite reduction by
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3

Williams, Anna Rachel. "Using flow through reactors to study the non-reductive biomineralization of uranium phosphate minerals." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43701.

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Uranium contaminations of the subsurface in the vicinity of nuclear materials processing sites pose a health risk as the uranyl ion in its oxidized state, U(VI), is highly mobile in aquifers. Current remediation strategies such as pump and treat or excavation are invasive and expensive to implement on a large scale. In situ bioremediation represents an alternative strategy that uses the ability of local microbial communities to immobilize contaminants and is actively studied for uranium remediation. The immobilization of U(VI) in groundwater is achieved either by bioreduction to solid uran
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4

Linard, Marco AntÃnio BasÃlio. "Perfil mineral e proteico do plasma seminal de coelhos." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12861.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Seminal plasma is the fluid portion of semen and its presence positively affects the survival and parameters of sperm motility in rabbits. This study aimed (i) to verify the seminal concentrations of sodium, chloride and citric acid as a function of collection month, the color and aspect of the ejaculate, and to find the frequency of ejaculations with the presence of gel fraction, color and aspect of the semen of rabbits on tropical climate, (ii) to meet monthly protein spots and their possible correlation with seminal and biochemi
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5

Franks, Matthew James. "The Role of Soil Organic Matter and Fe- and Mn-(Oxy)Hydroxide Minerals in Agriculture: Implications on Nutrient Dynamics." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1594151828787397.

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6

Coelho, Roberto Luciano [UNESP]. "Acúmulo de nitrato e produtividade de cultivares de almeirão em cultivo hidropônico-NFT." Universidade Estadual Paulista (UNESP), 2002. http://hdl.handle.net/11449/96971.

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Made available in DSpace on 2014-06-11T19:28:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-06-28Bitstream added on 2014-06-13T19:37:10Z : No. of bitstreams: 1 coelho_rl_me_jabo.pdf: 1102139 bytes, checksum: c539c3bde74769a408f6551d04fc9556 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Foi conduzido um experimento em sistema hidropônico-NFT no período de setembro a novembro de 2001, na FCAV-UNESP, Jaboticabal-SP, situada a 21°15'22 S, 48°18'48 W, e altitude de 595 m. Foi utilizado o delineamento experimental de blocos casualizados, em parcelas subdividi
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7

Illi, Júlia Carolina. "Utilização de rejeito de carvão mineral modificado com HTDMA-Br como sólido sorvente no tratamento de águas contaminadas com nitrato." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/157754.

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Entre as principais fontes de contaminação de águas superficiais e subterrâneas encontra-se o lançamento de despejos industriais e de esgoto doméstico sem tratamento e o uso de fertilizantes agrícolas. Nestas matrizes, o íon nitrato aparece como um dos poluentes que mais influencia na degradação das águas. O nitrato é extremamente estável e solúvel em meio aquoso, o que dificulta a remoção do mesmo de águas e efluentes. Uma alternativa de baixo custo e eficiente para remover este poluente consiste no processo de sorção. Além disso, ressalta-se que diversos sólidos podem ser utilizados como sor
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8

Coelho, Roberto Luciano. "Acúmulo de nitrato e produtividade de cultivares de almeirão em cultivo hidropônico-NFT /." Jaboticabal : [s.n.], 2002. http://hdl.handle.net/11449/96971.

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Orientador: Arthur Bernardes Cecílio Filho<br>Banca: Leila Trevizan Braz<br>Banca: Max José de Araújo Faria Júnior<br>Resumo: Foi conduzido um experimento em sistema hidropônico-NFT no período de setembro a novembro de 2001, na FCAV-UNESP, Jaboticabal-SP, situada a 21°15'22" S, 48°18'48" W, e altitude de 595 m. Foi utilizado o delineamento experimental de blocos casualizados, em parcelas subdivididas, com quatro repetições. Os fatores avaliados foram concentrações de nitrogênio na solução nutritiva (110, 165, 220 e 275 mg N.L-1) que constituíram as parcelas, e quatro cultivares de almeirão (Pã
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9

Kölln, Oriel Tiago. "Eficiência de uso de nitrogênio pela cana-de-açúcar: diferenças genotípicas, preferência por amônio e emissão de N2O." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-20062016-152701/.

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O uso ineficiente do nitrogênio (N) é um problema global, que pode diminuir a sustentabilidade da produção agrícola da cana-de-açúcar para fins energéticos devido às emissões de N2O oriundas da fertilização nitrogenada. A eficiência de utilização de nitrogênio (EUN) tem sido pouco estudada em genótipos de cana-de-açúcar, o que pode ser preocupante devido a importância da cultura para o país. O objetivo desse estudo foi avaliar a EUN de genótipos de cana-de-açúcar, verificando se genótipos contrastantes tem preferência de absorção por amônio ao invés de nitrato, e checar se extratos radiculares
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10

Silva, Maria do Socorro Pinheiro da. "Estudo sobre a aplicaÃÃo da espectrofotometria derivativa na anÃlise de nitrogÃnio em diversas matrizes de Ãguas." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11866.

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A determinaÃÃo dos nÃveis de nitratos e nitrogÃnio total (NT) em Ãguas constitui uma ferramenta importante no sentido de avaliar o controle de seus nÃveis para proteÃÃo da saÃde humana bem como para caracterizar a eutrofizaÃÃo dos corpos aquÃticos. O presente trabalho faz um estudo da espectrofotometria derivativa (ED) para determinaÃÃo de nitratos e NT pelo mÃtodo zero-pico por ED, em segunda derivada, no mÃximo de absorÃÃo do nitrato (225nm). Neste estudo foram avaliados os interferentes comumente encontrados nas matrizes onde a metodologia foi aplicada, que foram Ãguas minerais, Ãguas adici
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11

Torres, Dorante Luis Omar. "Evaluation of a layered double hydroxide (LDH) mineral as a long-term nitrate exchanger in soil." Göttingen Cuvillier, 2007. http://d-nb.info/985618248/04.

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12

Evans, Melissa Cheryl Foster. "Characterization and Formation of Particulate Nitrate in a Coastal Area." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000142.

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13

Robinson, Bryce. "The Oxidation of Fe (II), Fe (II) Mineral, and Rapid Denitrification under Cyanobacterial Interfacial Competition by Novel NDFe(II)OB, Pseudogulbenkiania ferrooxidans sp. MAI-1." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39468.

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Nitrogen is an essential constituent and building unit of all living organisms, and the primary limiting nutrient on our planet such that its cycle widely depends on the diverse nitrogen-transforming microorganisms, such as denitrifiers. Oxygen minimum zones or hypoxic aquatic ecosystems account for 30-50% of all nitrogen denitrification and under dynamic transformation imbalance, of measure dependent variable modularity, little is known about discrete shifts in denitrification competition by various microorganisms of divergent metabolism; or the Fe (II) – Fe (III) redox linking process. Novel
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14

Cezar, França Barreto Julio. "Água mineral na região metropolitana do Recife: riscos de contaminação nos aqüíferos." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/5184.

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Made available in DSpace on 2014-06-12T17:36:56Z (GMT). No. of bitstreams: 2 arquivo5688_1.pdf: 2994190 bytes, checksum: 71f7c3cc37d50e576d3e3efc3780b4c1 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2011<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A contaminação das águas subterrâneas, tema central dessa pesquisa, está intimamente correlacionada à falta de controle dos órgãos competentes e fiscalizadores, os quais não se fazem presente apenas no que se refere à parte construtiva e operacional dos poços tubulares
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15

Gankanda, Aruni. "Heterogeneous and multiphase chemistry of trace atmospheric gases with mineral dust and other metal containing particles." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/3090.

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Particulate matter in the atmosphere emitted from various natural and anthropogenic sources is important due to their effects on the chemical balance of the atmosphere, the Earth's climate, human health and biogeochemical cycles. Although there have been many studies performed to understand the above effects, there still remains substantial uncertainty associated with processes involved and thus it is difficult for current atmospheric chemistry and climate models to reconcile model results with field measurements. Therefore, it is important to have better agreement between models and observati
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16

Coraspe-Leon, Hector Manuel. "Aspectos nutricionais da batateira para produção de tubérculo-semente em ambiente protegido." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-09112007-090854/.

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Apesar da sua importância e o grande número de estudos sobre a cultura da batata (Solanum tuberosum L.), nas condições tropicais as pesquisas existentes sobre a nutrição mineral da batateira para produção de tubérculo-semente, tanto em campo quanto em ambientes protegidos, são escassas. A produção de tubérculo-semente em ambiente controlado, como o sistema utilizado pelo IAC, deve ser mais bem compreendido para ser sujeito de melhoras tecnológicas. Dentre os cultivares para uso industrial no Brasil, o cv. 'Atlantic' destaca-se por ser uma das poucas adaptadas a essa finalidade e pela elevada c
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17

CHARPIN, MARIE-FRANCOISE. "Les activites enzymatiques nitrate-reductase, glutamine-synthetase et glutamate-deshydrogenase : interets pour l'etude du metabolisme de l'azote mineral des peuplements phytoplanctoniques lacustres." Clermont-Ferrand 2, 1997. http://www.theses.fr/1997CLF21936.

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Dans l'optique d'une meilleure comprehension du metabolisme de l'azote mineral des communautes phytoplanctoniques lacustres, nous avons mesure l'activite de trois enzymes clefs du metabolisme de cet element chimique : la nitrate-reductase (nr), la glutamine-synthetase (gs) et la glutamate deshydrogenase (gdh). Une etude comparee a ete realisee entre un ecosysteme eutrophe, le lac d'aydat et un ecosysteme oligomesotrophe, le lac pavin. La nr et la gdh presentent les caracteristiques d'enzymes inductibles alors que la gs semble constitutive. Ainsi, conformement aux resultats rapportes dans la li
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18

Rosado, Sulianne Idalior Paião, and 92-99314-3855. "Crescimento, estado nutricional e fotossíntese de Cedrela odorata L. adubada com diferentes proporções de Nitrato e Amônio." Universidade Federal do Amazonas, 2017. http://tede.ufam.edu.br/handle/tede/6110.

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Submitted by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-01-25T15:01:42Z No. of bitstreams: 2 Dissertação_Sulianne I. P. Rosado.pdf: 618582 bytes, checksum: b4bf636459fa99acd259d824e76d2972 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-01-25T15:02:11Z (GMT) No. of bitstreams: 2 Dissertação_Sulianne I. P. Rosado.pdf: 618582 bytes, checksum: b4bf636459fa99acd259d824e76d2972 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204
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Paula, Laércio Boratto de. "Atividade da redutase do nitrato e teores de nutrientes e de açúcares em variedades de cenoura fertilizadas com doses de nitrogênio." Universidade Federal de Viçosa, 2003. http://www.locus.ufv.br/handle/123456789/10248.

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Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2017-05-08T11:24:57Z No. of bitstreams: 1 texto completo.pdf: 285366 bytes, checksum: aeef49012a32a67b649c262d1d4494fc (MD5)<br>Made available in DSpace on 2017-05-08T11:24:57Z (GMT). No. of bitstreams: 1 texto completo.pdf: 285366 bytes, checksum: aeef49012a32a67b649c262d1d4494fc (MD5) Previous issue date: 2003-07-31<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Com o objetivo de avaliar a atividade da enzima redutase do nitrato, teores de nutrientes e de açúcares nas variedades de cenoura Nante
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MURATORE, CHIARA. "CHARACTERIZATION OF PROTEOMIC CHANGES IN CROPS DURING METABOLIC ADAPTATION TO DIFFERENT NITROGEN INPUTS." Doctoral thesis, Università degli Studi di Milano, 2023. https://hdl.handle.net/2434/951273.

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Nitrogen availability is one of the major factors that influence plant growth, morphology, and metabolism and, hence, crop productivity. In agricultural soils, nitrogen is present in different forms, both inorganic (nitrate and ammonium) and organic (amino acids, short peptides and urea), with variable and heterogeneous distribution. Nowadays, improving knowledge about the nitrogen nutrition in plants is crucial to address the urgent need for a more sustainable agricultural production. In the last years, the “-omics” approaches provided a holistic perspective of the molecular mechanisms underl
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Junior, João Cardoso de Souza. "Suprimento de nitrato e amônio e a tolerância do capim tanzânia ao estresse por excesso de cobre." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-18052017-142834/.

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O suprimento de proporções de nitrato (NO3-) e amônio (NH4+) no meio de crescimento pode otimizar o metabolismo e o crescimento do Panicum maximum. A toxidez de cobre (Cu) causa estresse oxidativo nas plantas, afetando o metabolismo, a fotossíntese e a produção de massa. Não há pesquisas associando proporções de NO3-/NH4+ no alívio do estresse por Cu em plantas. O objetivo foi avaliar o efeito da toxidez de Cu no metabolismo, nutrição mineral, fotossíntese e produção do capim tanzânia, assim como o papel de proporções de NO3-/NH4+ no alívio dessa toxidez. O delineamento experimental foi de blo
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22

Giacometti, Laudicéia [UNESP]. "Qualidade microbiológica, concentração de nitratos em águas de consumo alternativo (minerais e de poços) da cidade de Jaboticabal-SP." Universidade Estadual Paulista (UNESP), 2001. http://hdl.handle.net/11449/94950.

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Made available in DSpace on 2014-06-11T19:27:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2001-12-18Bitstream added on 2014-06-13T19:35:24Z : No. of bitstreams: 1 giacometti_l_me_jabo.pdf: 1843637 bytes, checksum: 2ee106fa5b043c1aa7396d2737ebf98b (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Fatores como o gosto e o odor associados à população pela desinfecção com cloro realizada em águas de abastecimento público têm estimulado um maior consumo de águas minerais e águas de poços particulares, situação que desperta o interesse pela qualidade desse tipo de a
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Giacometti, Laudicéia. "Qualidade microbiológica, concentração de nitratos em águas de consumo alternativo (minerais e de poços) da cidade de Jaboticabal-SP /." Jaboticabal : [s.n.], 2001. http://hdl.handle.net/11449/94950.

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Resumo: Fatores como o gosto e o odor associados à população pela desinfecção com cloro realizada em águas de abastecimento público têm estimulado um maior consumo de águas minerais e águas de poços particulares, situação que desperta o interesse pela qualidade desse tipo de abastecimento que tem sido denominado como consumo alternativo. Diante disso, o presente trabalho teve como objetivo verificar a qualidade higiênico-sanitária e a concentração de nitratos em águas engarrafadas e de poços particulares utilizadas pela população de Jaboticabal, SP. Para as águas engarrafadas foram estudadas t
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Silva, Maria do Socorro Pinheiro da. "Estudo sobre a aplicação da espectrofotometria derivativa na análise de nitrogênio em diversas matrizes de águas." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/14688.

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SILVA, M. S. P. Estudo sobre a aplicação da espectrofotometria derivativa na análise de nitrogênio em diversas matrizes de águas. 2013. 116 f. Dissertação (Mestrado em Química) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2013.<br>Submitted by Daniel Eduardo Alencar da Silva (dealencar.silva@gmail.com) on 2014-11-24T23:43:23Z No. of bitstreams: 1 2013_dis_mspsilva.pdf: 1330387 bytes, checksum: 651f2c3fb1eb3e73ee989537d9bcc349 (MD5)<br>Approved for entry into archive by José Jairo Viana de Sousa(jairo@ufc.br) on 2016-01-06T18:54:41Z (GMT) No. of bitstreams: 1 2013_dis_mspsi
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Thitithanakul, Suraphon. "Effet de la nutrition azotée avant le débourrement sur le développement précoce du jeune peuplier." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00797958.

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Dans un sens large, le statut azoté de l'arbre impacte largement sa physiologie au printemps. Cependant la plupart des recherches conduites sur la remobilisation du carbone et de l'azote en cette période ont négligé l'hypothèse d'un rôle significatif de l'absorption d'azote avant le débourrement, en particulier, celui agissant en interaction avec l'utilisation des réserves carbonées et azotées et qui interviendrait dans la qualité de la croissance des jeunes pousses. Cette recherche a été entreprise avec une approche expérimentale et a été conduite avec de jeunes peupliers hybrides (Populus tr
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Clough, Tim J. "Fate of urine nitrogen applied to peat and mineral soils from grazed pastures." Lincoln University, 1994. http://hdl.handle.net/10182/1030.

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This study has provided fundamental information on the fate of urine nitrogen (N) when applied to pasture soils. In this work the three pasture soils used were a Bruntwood silt loam (BW), an old well-developed (lime and fertilizer incorporated and farmed for more than 20 years) peat soil (OP) and a young peat (YP) which was less developed (farmed for about 10 years). Initial soil chemical and physical measurements revealed that the peat soils were acidic, had higher cation exchange capacities, had greater carbon:nitrogen ratios and were better buffered against changes in soil pH than the BW so
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Coelho, Maurício Antônio de Oliveira. "Atividade da nitrato redutase, composição mineral e caracteres da planta de trigo associados à aplicação de molibdênio, à peletização e à inoculação das sementes com Azospirillum brasilense." Universidade Federal de Viçosa, 2001. http://www.locus.ufv.br/handle/123456789/10980.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2017-07-03T17:23:46Z No. of bitstreams: 1 texto completo.pdf: 529263 bytes, checksum: 519329022e5e2f52db8e5958ffce55b7 (MD5)<br>Made available in DSpace on 2017-07-03T17:23:46Z (GMT). No. of bitstreams: 1 texto completo.pdf: 529263 bytes, checksum: 519329022e5e2f52db8e5958ffce55b7 (MD5) Previous issue date: 2001-06-18<br>Fundação de Amparo à Pesquisa do Estado de Minas Gerais<br>Este estudo objetivou avaliar, em dois cultivares de trigo irrigado, os efeitos da inoculação, peletização das sementes e aplicação de Mo em cobertur
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Марченко, В. С. "Вплив системи удобрення на формування урожайності картоплі сорту Карлен в умовах зрошення". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25086.

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Марченко, В. С. Вплив системи удобрення на формування урожайності картоплі сорту Карлен в умовах зрошення : випускна кваліфікаційна робота : 201 "Агрономія" / В. С. Марченко ; керівник роботи Л. А. Шевченко ; НУ "Чернігівська політехніка", кафедра аграрних технологій та лісового господарства. – Чернігів, 2021. – 47 с.<br>У роботі представлені результати визначення впливу різних норм мінерального удобрення в умовах зрошення, що використовуються у технології вирощування картоплі сорту Карлен. Систематизовані та описані основні види зрошення, що використовуються у господарстві Біотех ЛТД. Визначе
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Faierson, Eric J. "Influences of Reaction Parameters on the Product of a Geothermite Reaction: A Multi-Component Oxidation-Reduction Reaction Study." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/32327.

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This study investigated an oxidation-reduction reaction involving a mixture of minerals, glass, and aluminum that exhibited thermite-type reaction behavior. Thermite reactions are a class of Self-propagating High-temperature Synthesis (SHS) reactions. Chemical reactions between raw minerals and a reducing agent, which exhibit thermite-type reaction behavior, are termed geothermite reactions by the author. Geothermite reactions have the potential for use in In-Situ Resource Utilization (ISRU) applications on the Earth, the Moon, Mars, and beyond.<p> A geothermite reaction was shown to occu
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Cabanel, Régis. "Elaboration, caractérisation et propriétés électroniques de couches minces de nitrure de niobium et d'oxyde de niobium." Grenoble INPG, 1986. http://www.theses.fr/1986INPG0051.

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Etude, entre 1 et 300 k, de la conductivite de couches minces granulaires. Mise en evidence d'une supraconductivite dans des films avec coefficient de temperature negatif. Mesures de reflexion optique dans le visible; la correlation avec les mesures de conductivite electrique
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31

Antoine, Serge. "Etude de la synthèse hydrothermale de la variété cubique du nitrure de bore à très hautes pression et température." Grenoble 1, 1988. http://www.theses.fr/1988GRE10115.

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Bn cubique est une variete "haute pression" du compose bn. Il est prepare par transformation a hautes pression et temperature de la variete hexagonale en presence d'un catalyseur. Les conditions de preparation en presence d'eau comme catalyseur (synthese hydrothermale sous tres hautes pression et temperature) ont ete etudiees, en fonction de la dimension et de la qualite cristalline des cristallites de la poudre de depart. Preparation de nombreux echantillons bn hexagonaux du materiau turbostratique tres mal ordonne au materiau graphitique bien cristallise. Determination des dimensions des gra
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32

Chery, Philippe. "Variabilité de l'épaisseur de la couverture de sol : conséquences pour le bilan hydrique hivernal d'un secteur de petite Beauce." Nancy 1, 1995. http://www.theses.fr/1995NAN10409.

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La dégradation croissante de la qualité des eaux de la nappe phréatique de petite Beauce a conduit à l'élaboration de plusieurs programmes de lutte contre la pollution d'origine principalement agricole. Le nitrate constitue l'un des principaux facteurs de la détérioration de la qualité des eaux souterraines et le seuil de 50 mg/l est aujourd'hui très largement dépassé dans de nombreux forages AEP. De plus, cette nappe phréatique étant essentiellement réalimentée par le drainage hivernal de la couverture de sol, l'accroissement des prélèvements estivaux pour l'irrigation et plusieurs hivers suc
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33

Wittebolle, Guy. "Influence des basses temperatures racinaires sur la croissance, le regime hydrique et la repartition des assimilats chez le dactyle (dactylis glomerata l. )." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13028.

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Analyse des consequences du refroidissement des racines sur la croissance et le developpement du dactyle en phase vegetative permettant l'etude du fonctionnement de la plante entiere en rapport avec la contrainte hydrique et la nutrition minerale
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34

ELKACEMI, KACEM. "Etude electrochimique de divers conducteurs organiques." Paris 6, 1986. http://www.theses.fr/1986PA066399.

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Etude electrochimique des sels de radicaux ioniques organiques, des complexes par transfert de charge et des radicaux ioniques. Donnees sur les composes conducteurs, formes par oxydation du tetrathiofulvalene (ttf) en presence de differents anions (scn**(-), no::(3)**(-) et mncl::(3)**(-)), par oxydation de tmttf dans l'acetonitrile en presence de scn**(-) et par reduction de tcnq en presence de differents cations. Donnees, aussi, sur les proprietes optiques et electrochimiques des films conducteurs de polyaniline
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35

Dagoneau, Christelle. "Chimie des nitrones : application à la synthèse de composés bio-actifs." Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10102.

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Ce travail de these porte sur l'elaboration de methodes d'acces aux -aminoesters ,-satures et ,-dihydroxyles, a partir de nitrones. L'addition nucleophile de 3-lithiopropiolates d'alkyle sur ces dernieres constitue la reaction-clef des differentes strategies employees. Au cours de ce travail, nous avons mis au point une methode de synthese rapide et efficace de -aminoesters. L'application de cette strategie de synthese a la nitrone derivee du (s)-glyceraldehyde a permis d'acceder de facon stereoselective au (s)-vigabatrin, compose actif du sabril, medicament largement utilise dans la preventio
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36

Fritz, Serge. "Etude des defauts ponctuels dans le mononitrure d'uranium par diffusion, trempe et canalisation apres bombardement ionique." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13184.

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La nature et le comportement des defauts ponctuels thermiques et des defauts d'irradiation dans le mononitrure d'uranium ont ete etudies. Les defauts thermiques ont ete etudies par trempe et une technique de diffusion de traceur a servi a mesurer la diffusivite de l'uranium. L'effet de la pression d'azote sur l'auto-diffusion de l'uranium suggere un mecanisme lacunaire. Une etude de canalisation et de microscopie electronique d'echantillons implantes avec des ions a permis de comprendre le dommage d'irradiation et sa restauration thermique
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37

Masri, Ahlam El. "Influence de la modification de la surface des électrodes sur la réduction du monoxyde de carbone et l'oxydation de dialdéhydes et de dialcools." Grenoble INPG, 1986. http://www.theses.fr/1986INPG0003.

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Sur Pt et Pt platine, la reduction de Co en milieu organique contenant de l'eau, conduit a la formation de methanol avec un rendement de 47% : co+4h**(+)+4e**(-)->ch::(3)oh. Le potentiel auquel a lieu cette reaction (-2,5 vvsag/ag**(+)10**(-2)m, est en accord aec une reduction simultanee de co et de h**(+) et une reaction entre les especes adsorbees sur l'electrode d'influence des adatomes sur les produits issus de l'oxydation du glyoxal et de l'ethylene glycol a ete etudiee en milieu hclo::(4) hclo::(4),n, h::(2)so::(4)2m et kno::(3)m de concentration de certaines especes, comme l'acide glyox
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Marais, Johan Pieter. "Effect of nitrate upon the digestibility of kikuyu grass (Pennisetum clandestinum)." Thesis, 1985. http://hdl.handle.net/10413/9632.

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The factors affecting the accumulation of nitrate in kikuyu grass pastures and the effect of elevated nitrate levels upon digestion in the ruminant were investigated. A high potassium level in the soil seems to be the major factor stimulating the accumulation of excessive amounts of nitrate in kikuyu grass, when the nitrate content of the soil is also high. The continuous elongation of kikuyu grass tillers allows constant exposure of high nitrate containing stem tissue to the grazing ruminant. Digestibility studies in vitro showed that nitrite, formed during the assimilatory reduction of nitr
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39

Shuai, Xiufu. "Kinetics of adsorption/desorption of nitrate and phosphate at the mineral/water interfaces by system identification approach." Thesis, 2004. http://proquest.umi.com/pqdweb?index=30&did=766012021&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1233345917&clientId=23440.

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40

Erasmus, Rudolph Marthinus. "Optical properties and mechanical stress in cubic boron nitride and diamond." Thesis, 2013. http://hdl.handle.net/10539/12572.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy<br>Raman and photoluminescence (PL) spectroscopy techniques were used to investigate the mechanical properties of diamond and cubic boron nitride (cBN) by optical means. Both these materials have extreme mechanical properties that make them the material of choice for many industrial applications, ranging from cutting and grinding to wire-drawing dies. The results obtained on single crystal diamond, polycrystalline diamond (P
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Torres, Luiza Nascimento Dias. "Nitrogen dynamics after applying biochar, zeolites and mineral fertilizers in soil-plant environment of corn (Zea mays)." Master's thesis, 2018. http://hdl.handle.net/10198/19708.

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Dupla diplomação com a Universidade Tecnológica Federal do Paraná - UTFPR<br>Every crop needs a well-nourished soil and balanced nutrition to have a good development. Nitrogen (N) balance is essential for plant development, and it depends on soil physical, chemical and biological properties. Some soil conditioners may have a relevant role in soil available nitrogen. The present work intends to evaluate the effect of soil conditioners such as Biochar, Zeolites and Mineral fertilizers on soil properties, particularly on nitrogen dynamics, and corn crop growth and yield. It is also the objective
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Nemadodzi, Lufuno Ethel. "Growth and development of baby spinach (Spinacia oleracea L.) with reference to mineral nutrition." Diss., 2015. http://hdl.handle.net/10500/18673.

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Baby spinach is a relatively new crop in South Africa with both commercial significance and reputed health benefits. It is known to assist in combating degenerative conditions associated with ageing, such as heart disease, cardiovascular disease, Alzheimer’s disease, cataracts and several forms of cancer. Three parallel NPK trials were conducted to investigate the effects of nitrogen (N), phosphorus (P) and potassium (K) on the growth and development of baby spinach. N and P treatments were arranged as (0, 45, 75, 105, 120 kg.ha -1 N and P), and K treatments were arranged as (0, 63, 85, 127, 1
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43

Westerschulte, Matthias. "Slurry injection to optimize nutrient use efficiency in maize: Soil nitrogen dynamics and plant nutrient status." Doctoral thesis, 2017. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2017090116224.

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Maize is the dominant crop in northwestern Germany and is mostly cultivated on sandy soils. Additionally, due to intensive livestock husbandry and biogas production, large amounts of liquid manures are produced. The current farm practice leads to high N and P surpluses at field level accompanied by environmental pollution, like nitrate leaching, eutrophication of non-agricultural ecosystems, and N2O emissions. The accruing liquid manures are often used for maize fertilization. Thereby, slurries are mainly broadcast applied using trailing hose applicators followed by incorporation into the tops
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