Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 130 for “"scission"”.
-
VPS1 on Dynamics of Endocytic Components and Endocytic Scission
… RVS167gene, an essential player for endocytic scission. The physiological significance of the genetic interaction between VSP1 and RVS167 was confirmed by the significantly delayed maturation of Abp1-GFP at a non-permissive temperature. The investigation of the presumed physical interaction …
-
SCISSION: The Architectural Collage and Gordon Matta-Clark's Circus Caribbean Orange
SCISSIONS: Architecture, Collage-Making and the Fragmented Imagination of Gordon Matta-Clark reconceptualizes cutting as a generative architectural operation. Bridging archival research, material culture studies and critical theory, the dissertation advances three claims. First, purposeful …
-
Kinetics of Methyl Ketone and Levulinic Acid Oxidative Scission Over Supported Vanadium Oxide Catalysts
… in high yields through methyl a-carbon oxidative scission over supported vanadium oxide catalysts. However, the high selectivity of methyl scission during LA oxidation appears to be unexpected according to the trends observed during the analogous oxidative scission of methyl ketones (e.g., …
-
Thermochemical Interconnectivities of Active Sites on Metal Oxides and their Catalytic Consequences in C−O Formation and C−H Scission Chemistry
Surfaces of transition metal oxides consist of metal cations (Mn+) and oxygen anions (O2−), each with distinct catalytic functions—the coordinated protons on lattice O-atoms act as Brønsted acid sites (H+), the coordinatively unsaturated cationic metal centers function as Lewis acid sites …
-
The Effects of Electron Radiation on the Glass Transition Temperature of a Polyetherimide
… for a dose of 100 MGy. The cross-link and chain scission densities in the irradiated PEI were determined using infrared spectroscopy. The cross-link density increased with dose for all doses investigated. The chain scission density increased with dose for doses up to 75 MGy, but was lower for a …
-
Structure and activity relationships of bimetallic catalysts for aqueous phase reforming and the water-gas shift reaction
… dehydration/hydrogenation routes to [C-O] bond scission. Electron energy loss spectroscopy (EELS) maps confirm that while for individual particles Re remains well mixed with Pt in PtRe/MWCNT, the Re metal is well dispersed on the high surface area activated carbon support of PtRe/C, allowing …
-
Ethanol and Fluorinated Ethanol Decomposition on Single Crystal Platinum Surfaces: Structure Sensitivity and Electronic Effects
… as on Pt(331), except the ethanol C-C bond scission is suppressed on Pt(110). On oxygen precovered (2 x 1)Pt(110) surface the C-C bond scission occurred at higher temperature than on Pt(331), but from the slope of the Hammett plot, it is shown that on (2 x 1)Pt(110) the hydrogen has less …
-
Radiation induced degradation of elastomers.
… PDMS elastomer degraded thermally by hydrolytic scission of the main chain and chain reformation by condensation of the silanol chain end groups. However,predominant chain reformation was observed during thermal degradation studies and it was believed that this was a consequence of the …
-
Mechanically mediated trithiocarbonate addition to commodity polymers for a more circular economy
… be. Great levels of mechanical force cause chain-scission and lower product value while simultaneously only working once, maybe twice before the material is useless. Studies to harness the chain-scission with functional groups have proved possible but limited. This study shows the effect of adding …
-
The effects of ionising radiation on polypropylene
… are used to measure the radiationyield for chain scission G (s). Irradiation at room temperature causes significantly more chain scission than at 195K. Additional chain scission occurs on storage following irradiation at 195 K. Free radical concentrations are determined by electron spin resonance, …
-
The Intrinsic Activation Energy as a Guide to Mechanisms of Reactions on Solid Surface
… reaction pathways which involve C-C or C-O bond scission have 30 kcal/mole higher intrinsic activation energy than reactions that involve C-H or O-H bond scission. It was also established that the intrinsic barrier for a certain reaction mechanism stays constant over a reaction series across a …
-
Oxidation and stabilisation chemistry of metallocene-based polyolefins during melt processing
… degradation behavior (crosslinking or chain scission) during melt processing. The metallocene polymers mainly underwent chain scission at lower temperature (<220°C) but crosslinking became predominant at higher temperature for both TR and TSE processed polymers. Generally, the more comonomers …
-
An investigation of the factors affecting the degradation of cellulose acetate artefacts in museum collections
… of oxalate in degraded samples indicates chain scission occurring and high levels of acetate indicate deacetylation is occurring. Non-destructive and destructive sampling for ion chromatography have been used to explore if this is a viable screening process to identify artefacts in the early …
-
Studies of Radiation Effects in Three High Polymers
… at these total doses results in net chain scissioning in Mylar and net crosslinking in Ultem, while self-mending is predominant in Kapton. The dielectric constant was measured before and after irradiation, but no significant changes due to irradiation were observed. Electron paramagnetic …
-
Functionalisation of polymers: reactive processing, structure and performance characteristics
… of GMA and the crosslinking of NR or chain scission of PP were identified as the main side reactions that competed with the desired grafting reaction in the polymers. At high concentrations of the peroxide T-101 (>0.02 mr) cross linking of NR and chain scission of PP became dominant and …
-
Molekulare Dissoziation im elektronischen Grundzustand induziert durch Femtosekundenpulse im mittleren Infrarot
… (v=7-8) provides the necessary energy for bond scission. This excitation scheme was demonstrated with metal carbonyls and diazomethane. Only ultrashort laser pulses allow for excitation and subsequent reaction on a time scale faster than the statistical energy redistribution (IVR).
-
The Chemistry of Methanol On Gold and Gold Based Bimetallic Clusters On TiO2 (110) Single Crystal
… coverage of gold with oxygen the hydroxyl bond scission to make adsorbed methoxy intermediates occurred more efficiently. This effect transposed into a shift to lower production temperatures and increased activity for the proposed disproportionation of two methoxy intermediates to produce …
-
On the Repair of DNA Breaks and the Specificity of the EcoRI Restriction Enzyme
… with these alleles revealed that in vivo DNA scission induces the E. coli SOS DNA repair response. However, neither SOS induction nor recombination are required to repair these lesions. DNA ligase is required and may suffice to repair EcoRI breaks in the E. coli chromosome. An in vivo DNA …
-
Ionic liquids as additives for biodegradable polyactic acid
… from rate constants calculated from random chain scission statistics and activation energies from thermogravimetric analysis, and accelerated its hydrolytic degradation, but to a lesser extent than the decanoate based IL. The catalytic role of the decanoate anion in hydrolytic degradation was …
Page 1 of 7