Thesis (M.S.)--Rochester Institute of Technology, 1991. / Typescript. Includes bibliographical references (leaves 140-142).

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 176-182). Also available via the Internet.

Des acides fulviques contenant éléments (1) C,H,O, (2) C,H,O,N et (3) C,H,O,N,S chimiques ont été synthétisés à partir de réactions dans quatre mélanges de composés chimiques purs : (1) C6H4(OH)2 + NaOH, (2) C6H4(OH)2 + CH3COOH +NaOH, (3) C6H4(OH)2 + NH2CH2COOH + NaOH et (4) C6H4(OH) 2 + NH2CH(CH2SH)COOH + NaOH, à pH = 10,0, à l’abri de la lumière et dans des conditions expérimentales proches de celles de la nature (température ambiante, f et f O2 ( g ) CO2 ( g ) atmosphériques). Des analyses qualitatives et semi-quantitatives des acides fulviques de synthèse (AFS) à l’aide d’une combinaison de techniques d'analyse en microscopie électronique, en spectrométrie moléculaire (FTIR-ATR, UV-visible, ESI-MS, APCI-MS) et en diffraction des rayons X ont permis d'obtenir les résultats suivants: - les quatre mélanges réactionnels ont produit un nombre important d'acides fulviques individuels, dont les rapports m/z pouvant atteindre une valeur maximale de 943 et sont amorphes; - les AFS comportent groupements fonctionnels: alcool, éther et carboxylate. L’introduction de composés tels que CH3COOH, NH2CH2COOH et NH2CH(CH2SH)COOH se traduit par d´acides fulviques contenant respectivement des groupements fonctionnels ester, amine et thiol. Enfin, une étude systématique des interactions entre l´ion U(VI) et des ligands fulvate contenant trois éléments (C,H,O) en fonction du pH (4 – 10) a été développée à l'aide de la spectroscopie UV-visible. Deux types de complexes U(VI)-fulvate ont été formés à pH = 4 - 7 et trois types de complexes à pH = 10. La présenc e de bandes d'absorption larges montrent que des ions polyuranyle (VI) participent à ces complexes U(VI) - fulvate. / Fulvic acids containing chemical elements (1) C,H,O, (2) C,H,O,N and (3) C,H,O,N,S have been synthesized from reactions in four mixtures of pure chemical reactants: (1) C6H4(OH)2 + NaOH, (2) C6H4(OH)2 + CH3COOH +NaOH, (3) C6H4(OH)2 + NH2CH2COOH + NaOH and (4) C6H4(OH)2 + NH2CH(CH2SH)COOH + NaOH, at pH = 10.0, in the dark and under oxidative conditions close to those encountered in the nature (ambient temperature and atmospheric conditions, f and f ) O2 ( g ) CO2( g ). Qualitative and semi-quantitative analysis of synthesized fulvic acids (SFA) using a combination of analytical techniques in electron microscopy, molecular spectrometry (ATR-FTIR, UV-visible, ESI-MS, APCI-MS), and X-ray diffraction have allowed to obtain the following results : - all four reaction mixtures have produced a large number of individual fulvic acids, whose m/z ratios can be as high as 943 and are amorphous; - the SFA contain functional groups: alcohol, ether and carboxylate. The addition of compounds such as CH3COOH, NH2CH2COOH and NH2CH(CH2SH)COOH led to fulvic acids containing respectively ester, amine and thiol functional groups. Finally, a systematic study of the interactions between the U(VI) ion and fulvate ligands containing three elements (C,H,O) as a function of pH (4 – 10) has been developed using UV-visible spectroscopy. Two types of U(VI)-fulvate complexes have been identified in pH range 4 – 7 and three types of complexes at pH = 10. The presence of absorption broadbands indicates that polyuranyl (VI) ions are part of constituents of the U(VI) - fulvate complexes.

Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 2001. / Field problem. Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 115-117). Also available via the Internet.

Thesis (Ph. D.)--University of Chicago.

Thesis (Ph. D.)--University of Chicago.

Thesis (M.S.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains viii, 132 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 62-63).

Proefschrift - Leyden.

this work, we have used the diamond-like carbon (DLC) also known as hydrogenated amorphous carbon (a-C:H), silicon doped DLC (a-C:H:Si) thin films deposited by the plasma enhanced chemical vapour deposition (PECVD) process on silicon substrate and studied their structural, electrical and electronic properties. The DLCs films were prepared at different applied bias voltage (Vb) starting from 100V to 600V; whereas the silicon is doped with DLC thin films using tetramethysilane (TMS) as a precursor at different standard centimetre cube per minute (sccm). In addition nitrogen doped amorphous carbon (a-C:Nx) thin films prepared by pulsed laser deposition (PLD) process and studied their different properties. Different nitrogen concentration (at.%) of a-C:Nx thin films were deposited on silicon substrate using nitrogen-gas as a precursor. The thicknesses of all thin films were ~15015 nm controlled and monitored during deposition process. Raman spectroscopy of these thin films was measured by using two different laser excitation wavelengths viz 488 nm and 647 nm respectively. The microstructure and electronic properties of these samples were investigated by Raman spectroscopy and the electrical property was studied by current-voltage (I-V) characteristics. Finally, a correlation among the electrical properties, electronic properties and micro-structure properties were established based on their sp3 and sp2 concentration in the thin film structure.