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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 64 for “"Red shift."”.
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Synthesis of novel red-shifted phthalocyanines
We prepared four types of red-shift phthalocyanines: 2,9,16,23-tetra(hetp-t-1 -enyl) phthalocyanine; 2,9,16,23-tetrachloro-3,10,17,24-tetra(3-methoxypro1p --y nyl) phthalocyanine; 3,4,12,13,2 1,22,30,3 l-octa(alkyny1) and octa(alkeny1) naphthalocyanines. It was found that the each conjugated …
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Essays in Behavioral Economics and Neuroeconomics
… Chapter 2: Testosterone Administration Induces A Red Shift in Democrats. Chapter 3: Neurophysiologic Predictors of Mood in the Elderly.</p>
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Fabrication of Gallium Indium Arsenide Phosphide Quantum Wire Heterostructures for Optoelectronic Applications
… In addition, annealing was also found to reduce the magnitude but maintain the direction of a red-shift in emission wavelength with cooling measurement temperature. This thermal treatment served to be a useful tool in engineering the emission wavelength from a QWR sample from 1.6 to 1.55 …
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Design and Construction of Computer Based Instrumentation for Absorption and Fluorescence Spectroscopy With Applications to the Study of Environmental Effects on the Absorption Spectra of 6-Acyl-2-Naphthylamines
… and slit. The optical chopper was reconfigured for a three sectored measurement cycle. Auto-gain operation was provided with a high-voltage programmable power supply for the PMT voltage. Data acquisition proceeds through a current-to-frequency converter to a counter. All aspects of …
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Effects of size and surface on optical properties of NaYF4:Yb,Er Nanoparticles
… (UC) materials in bioapplications is hindered by decrease of emission intensity when the particles are reduced to nanoscale dimension. This thesis focused on the effects of size and surface on optical properties of hcp NaYF4:Yb,Er particles, which is one of the most efficient near …
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Multispecies ion acceleration from intense laser interactions with thin foils
… Pressure Acceleration mechanism was explored with the use of ultra-thin foils, and a contrast enhanced circular polarised pulse with a peak intensity of 5.5×10 Wcm<sup>-2</sup> . The experimental data indicates the presence of an (intensity dependent) optimum thickness of 15 nm for …
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MODIFICATION OF XANTHENE AND SILICON ANALOGUES OF XANTHENE FLUOROPHORES FOR CHEMICAL PROBES DEVELOPMENT
… with a dimethylsilyl group which shows 90 nm red-shift relative to fluorescein (λabs/λem =582 nm/598 nm). These fluorophores have advantages over their oxygen counterparts because longer-wavelength allows deeper penetration of the light, causing less damage to the cells and less interference …
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Noncovalent Interactions Involving Microsolvated Networks Of Trimethylamine N-Oxide
… changes in vibrational frequencies. Spectral shifts in the experimental Raman spectra of interacting molecules are compared to the results of electronic structure calculations on explicit hydrogen bonded molecular clusters. The similarities in the Raman spectra of microsolvated TMAO using a …
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Ultrafast carrier dynamics and enhanced electroabsorption in (gallium,indium)arsenide/(aluminum,indium)arsenide asymmetric double quantum well structures
… spectroscopy. The results are compared to absorption changes in an undoped ADQW structure which utilizes the quantum confined Stark effect. The doped modulator exhibits a significantly larger red-shift with applied field than the undoped structure.
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Structure-Function Relationship Studies of the Rhodobacter Sphaeroides Cytochrome AA(3)
Cytochrome c oxidases catalyze the reduction of O2 to H 2O and use the redox energy released by this reaction to generate an electrochemical proton gradient. This proton gradient can be used to produce ATP by ATP-Synthase. Rhodobacter sphaeroides cytochrome c oxidase, the focus of this thesis, …
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Photoluminescence in rare earth activated oxides and II-VI chalcogenides
… of the peak appears to coincide with a reduction in particle size. With increasing cadmium concentration, this short wavelength (370 nm) emission band became distorted in symmetry and exhibited a red shift. This was seen as being indicative of a solid solution in which Cd substituted …
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Growth, spectroscopy and utilisation of novel low dimensional nanostructures: carbon nanotubes and quantum dots
… (SWCNTs) with diameters of 1.6 and 2.1 nm. Acquired Raman spectra showed very low intensity or none D — band while the G’ band was of high intensity indicating that the as produced CNTs may be of high quality. A by-product of this method is amorphous fibres which can be easily eliminated when …
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Towards The Development Of Intrinsically Fluorescent Unnatural Amino Acids For In Vivo Incorporation Into Proteins
… I will demonstrate our synthetic efforts to red-shift Acd’s emission and our preliminary efforts to incorporate these red-shifted Acd derivatives using a newly evolved synthetase. While our current efforts to incorporate Acd derivatives are unsuccessful, we have a crystal structure of the …
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Modeling and Simulation of Optical Properties of Noble Metals Triangular Nanoprisms
… Silver triangular nanoprism has exhibited blue shift on introduction of truncation and the blue shift continued further with depth of truncation. Similar observations were made for increase in thickness of nanoprism. In contrast, increase in edge length of the nanoprism has introduced a blue …
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Design, Synthesis, Photochemical and Biological Evaluation of Novel Photoactive Molecular Switches
… PSB-retinal is presented. Moreover, it is compared the photoswitching process of this family of switches by means of different electronic states (singlet or triplet state). In Chapter 6 it is described the synthesis, photochemical properties and cytotoxic evaluation of a novel family of …
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Electrolyte Effects on the Kinetics of Comproportionation Electron-Transfer Reactions and on Intervalence Charge-Transfer Band Energies of Binuclear Ruthenium Ammine Complexes
… accelerations which deviate strongly from the predictions of the classical Debye-Huckle theory with a range of different added “inert” electrolytes. The greater catalytic effects seen with the heavier halides and other catalytic electrolytes (especially certain dicarboxylates) indicate an …
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Synthesis, Characterisation and Functionalisation of CdSe Quantum Dots
… of reaction time. The nature of this phase shift is believed to be due to the rapid growth along the {111} crystallite facets, with the facial facets then 'catching-up', restoring the cubic symmetry. Due to the presence of many NMR active species in CdSe TOP/TOPO QDs viz., 113Cd, 77Se, 13C, …
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The Photophysics and Photochemistry of a series of Phthalocyanines as Potential Photosensitisers in Photodynamic Therapy
… distinct properties, including absorption in the red, low fluorescence and high triplet quantum yields that make it an ideal candidate as a potential photosensitiser in photodynamic therapy. Photodynamic therapy is an alternative treatment to cancer using a photosensitiser, which is preferentially …
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Nanoparticle sensors for the detection of DNA related to disease
… efficacy was investigated. It was discovered that the thioctic acidmodified oligonucleotide-nanoparticle conjugates remain stable under these conditions for a substantial period of time compared to thiol-modified oligonucleotide nanoparticle conjugates. The nanoparticle conjugates were …
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Plasma Treatment of Zinc Oxide Thin Film and Temperature Sensing Using the Zinc Oxide Thin Film
… In this work, zinc oxide thin films were prepared by easy and low cost solution method with oriented crystal growth along (002) plane. To improve electrical and optical property of the fabricated zinc oxide thin films, films were treated with oxygen, hydrogen, and nitrogen plasmas. Oxygen …
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