Spelling suggestions: "subject:"[een] SUBSTRATES"" "subject:"[enn] SUBSTRATES""
1 |
Electronic, optical and structural properties of semiconducting diamond-like carbon thin filmsSilva, Sembukuttiarachilage Ravi Pradip January 1994 (has links)
No description available.
|
2 |
Enzymatic finishing of cottonMoor, Angelena Jane January 2002 (has links)
No description available.
|
3 |
X-ray structure determination of Klebsiella pneumoniae nitrogenase component 1Mayer, Suzanne Marie January 2000 (has links)
No description available.
|
4 |
Growth and characterization of ZnSe thin filmHuang, Chia-wei 28 July 2010 (has links)
The research and development of zinc selenide (ZnSe) based wide-gap II¡VVI materials and related blue/green light-emitting devices have significantly progressed since 1990. ZnSe is also a promising material for use in windows, lenses, output couplers, beam expanders, optically controlled switching, visible transmission and giant photo-resistivity. Recently, ZnSe has become an important material used as the window layer of CuInSe2-based solar cells . To improve device performance, it is necessary to reduce interface defects and improve epitaxial layer quality. However, ZnSe thin films on glass substrates with high reliability and applicability have not yet been developed.
In this study, a ZnSe buffer layer was firstly grown by SME during the initial stage of film growth; the film crystallinity could gradually be improved layer by layer with smaller thicknesses. While the lattice disorder of the buffer layer decreased rapidly after several cycles of SME growth, the interfacial lattice mismatch between the buffer layer and the ZnSe film deposited by MBD was reduced. Thus, ZnSe films with buffer layers demonstrated better crystallinity.
Initial growth stage evaluation of high-quality ZnSe films deposited on glass substrate was investigated. The self-limiting monolayer epitaxial (SME) process was used to pre-growth the buffer layer for a zinc selenide (ZnSe) film deposited. After alternating depositions for several cycles, the growth mode was changed to the molecular beam deposition (MBD) mode under growth conditions. Films deposited at substrate temperatures of 250¡V350¢XC and Se/Zn beam equivalent pressure (BEP) ratios of 0.77¡V1.87 were investigated.
The crystal structure and preferred orientation of as-grown ZnSe films were examined using X-ray diffraction (XRD) patterns. The optical properties of the ZnSe films were revealed by photoluminescence spectra.
The structure properties of as-deposited ZnSe films have been measured by X-ray diffraction (XRD) technique. The optimum film growth condition has been determined rapidly by comparing and analyzing the relative full width at half-maximum (FWHM) and peak intensity of XRD spectra. The composition of ZnSe films is determined by energy dispersive spectroscopic (EDS) analysis. Optical properties of ZnSe films are characterized by photoluminescence spectra. In addition, the structural parameters, crystallinity, lattice constant, grain size, strain, dislocation density and orientation of ZnSe film calculated are correlated with their growth conditions. The characteristics of the ZnSe films with and without a buffer layer were compared and discussed in detail.
Finally, our results demonstrate that how the quality of ZnSe film can be improved on glass substrates for application to various devices.
|
5 |
Steady state kinetic analyses of nitroalkane oxidase mutantsBozinovski, Dragana Milivoj 15 May 2009 (has links)
Nitroalkane oxidase (NAO) catalyzes the oxidation of neutral
nitroalkanes to aldehydes and ketones with oxygen consumption and the production of
hydrogen peroxide and nitrite. The enzyme is a flavoprotein from the fungus Fusarium
oxysporum. The active site base, Asp402, abstracts one proton from the substrate to give
a carbanion which then attacks the flavin adenine dinucleotide (FAD). The three
dimensional crystal structure of NAO shows that Arg409 is 3.6 Å from Asp402. When
Arg409 is mutated to Lys, the rate constant for proton abstraction decreases 100-fold.
The three-dimensional structure of NAO also reveals the existence of a tunnel which
extends from the protein exterior and terminates at the FAD N5 atom and the residues
Asp402 and Phe401. We mutated amino acids in the tunnel into tryptophan,
phenylalanine and leucine. The L99W, S276W and S276A enzymes showed the biggest
decreases in both kcat and kcat/Km; these amino acids are closest to the FAD molecule and
the active site. Mutation of amino acids farther away from the active site showed very
small changes in the kinetic parameters. Ser276 is hydrogen bonded to Asp402 in the
wild-type enzyme. When this amino acid is mutated to alanine or tryptophan, k3, the rate constant for proton abstraction, decreases around 35 fold. Asp402, Arg409 and Ser276
constitute a catalytic triad in the active site of nitroalkane oxidase, and both Arg409 and
Ser276 are important for positioning Asp402 and catalysis.
|
6 |
Primary colonisation of submerged artificial substrates with special reference to marine macroalgae張國偉, Cheung, Kwok-wai. January 1986 (has links)
published_or_final_version / Botany / Master / Master of Philosophy
|
7 |
Growing Substrates Comprised of Composted Materials and Reduced Peat Moss for Production of Greenhouse Potted Gerbera (Gerbera jamesonii)Dombrowsky, Maria Patricia Anne 17 January 2012 (has links)
Peat moss is a major component of many plant growing substrates but is quickly becoming a limited resource. To reduce the reliance on peat moss a number of composted products, including pine mulch, manure, yard waste and aged bark - in combination with peat moss and/or coconut coir, were mixed in various combinations as growing substrates for greenhouse potted Gerbera (Gerbera jamesonii) production. Four new substrates were developed and compared to a commercial mix, BM6 in greenhouse production trials.
Experiments were conducted to (1) compare the plant growth and quality of potted Gerbera in the newly developed substrates to BM6, (2) determine whether a pre-charge fertilizer was needed for the newly developed substrates, (3) determine appropriate rates of a pre-charge fertilizer for the newly developed substrates, and (4) determine the nitrogen drawdown index over the time of production and determine if there is a relationship between the NDI values and the nitrogen availability measured by pour through values.
Two of the newly developed peat reduced substrates were successful in producing acceptable quality potted Gerbera. One of the substrates contained a low percentage of peat moss and the other contained coir fines. Fertilizer pre-charge rates, and some nutrient and irrigation management protocols were recommended for these two substrates.
|
8 |
Novel substrates for graphene based electronicsJalil, Rashid January 2012 (has links)
No description available.
|
9 |
Holliday junction processing enzymes in eukaryotesKeeley, Anthony John January 1999 (has links)
No description available.
|
10 |
The evaluation of novel bioadhesive systemsShivafard, Mohsen January 2000 (has links)
No description available.
|
Page generated in 0.0257 seconds