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 57 for “"Extinction coefficient"”.
-
The use of coated micropowders to reduce radiation heat transfer in foam insulation
… of foam insulation by increasing its extinction coefficient. In this work, theoretical analysis and experimental measurements have been used to study and increase the extinction coefficient of polyurethane foam insulation. Radiative heat transfer, which accounts for approximately 25% …
-
Physics Guided Machine Learning algorithm for MAX-DOAS retrieval
… that has been widely used to derive aerosol extinction coefficient profiles and trace gas concentrations. The ill-posed nature of the MAX-DOAS inversion problem makes it almost impossible to design an inversion algorithm providing a definite solution. A possible way to find a low-error …
-
Infrared spectroscopy of photodissociated carboxymyoglobin
… photodissociation, the lines shift and change in extinction coefficient, giving an indication of the nature of the neighborhood of the photodissociated CO. At temperatures between 10K and lOOK three different CO environments are seen after photodissociation, with relative populations depending on …
-
Synthesis of corn-derived carbohydrate derivatives as effective multifunctional sunscreen
… a broad-spectrum sunscreen with a high extinction coefficient has been desired. As part of our ongoing studies on isosorbide-cinnamate derivatives, this work have found they have great promise as multifunctional sunscreens, based on the isosorbide molecule as a carrier and the cinnamate …
-
An altimeter waveform model for combined surface and volume scattering
… including surface roughness and effective extinction coefficient. The capabilities and limitations of this new combined model are also discussed and guidelines for its use are detailed. The combined model is tested by comparing it to the Multimode Aircraft Radar Altimeter (MARA) data which …
-
Radiative transfer and thermal performance levels in foam insulation boardstocks
… geometry of the closed-cell foam. The extinction coefficient is experimentally and theoretically determined; the theoretical prediction based on measured geometrical properties differed from the measured values by an average of 6% for ten different foams An approximate method uses …
-
ΦΑΣΜΑΤΟΣΚΟΠΙΑ ΔΙΕΓΕΡΜΕΝΩΝ ΗΛΕΚΤΡΟΝΙΑΚΩΝ ΚΑΤΑΣΤΑΣΕΩΝ ΤΩΝ ΠΙΚΟΛΙΝΩΝ
… REGION OF 4-9.5 JEV. FROM THESE WEMEASURED THE EXTINCTION COEFFICIENT AND THE OSCILLATOR STRENGTH FOR THE DIFFERENT MOLECULAR TRANSITIONS. WE MADE ALSO AN ANALYSIS OF THEIR VIBRATIONAL STRUCTURE AND WE COMPARED THEM WITH THE SPECTRA OF BENZENE, TOLUENE AND PYRIDINE. FROM THE LINE INTENSITY …
-
Identification and Characterization of the Cyd Gene Locus of Escherichia Coli (Respiration, Membranes, Cloning, Energetics, Cytochromes)
… does not reduce molecular oxygen. The measured extinction coefficient of 21,000 M('-1) cm('-1) indicates a 1:1 stoichiometry of cytochrome b(,558) per Cyd.
-
Experimental investigation of a catalyst under various solar light conditions for hydrogen production.
… photochemical Ru(bpy)2(dpp)2+ is investigated. Extinction coefficient versus wavelength is determined for both a low intensity broad spectrum LED light source and one sun intensity simulated sunlight. Variation in the absorption characteristics from both the previously published monochromatic …
-
Second-Surface Mirror Effects in Thin-Film Absorber Layers
… in which the index of refraction is equal to the extinction coefficient. It was found that both of the volumetric heat generation models produce identical results. It was also found that the response of the detector due to shorter wavelengths deviates less from the surface absorption model than at …
-
Characterization of gold black and its application in un-cooled infrared detectors
… utilized to calculate refractive index (n) and extinction coefficient (k). The aging induced changes on electrical and optical properties were studied in regular laboratory conditions using transmission electron microscopy, Fourier transform infrared spectroscopy, and fore-probe electrical …
-
Light utilization and excretion of organic matter by antarctic lake phytoplankton
… using a suggested value for the spectral extinction coefficient of chlorophyll a (k<sub>c</sub>)=0.016 and an empirical estimation of k<sub>c</sub>= 0.0328. Quantum yields ranged from 0.0045 to 0.156 using k<sub>c</sub>= 0.016, while φ were lower when calculated using k<sub>c</sub>=0.0328, …
-
Precursors for perylene diimide dendrimers : synthesis and photophysics
… that the addition of TFA enhances the PDI extinction coefficient, which is interpreted as reversing a hypochromic effect from aggregation. The results showed that there were two jumps in the fluorescence spectra. The first one happened as the ratio of TFA/PDI exceeds 6:1 due to the …
-
Electrical characterization of large-area donor-acceptor molecular junctions
… film is an iron complex. The large extinction coefficient of the three perylene monolayer films make them visible on the water surface. They are also visible on all three substrates used for characterization. The self-assembled monolayer is a dimethoxybenzene donor bridged to a …
-
Reflectance spectroscopy system for real time and non-invasive detection of transcutaneous bilirubin level
… concentration using a priori knowledge of the extinction coefficient of bilirubin and haemoglobin components in the wavelength range of 400 500 nm. This study verified validity of the predicted value using light attenuation data from TracePro for a single-layered skin model with varying …
-
The synthesis of aza-dipyrromethenes as potential pdt agents and measurement of singlet oxygen generation.
… photosensitisers have limitations, such as a low extinction coefficient in the desired therapeutic wavelength of absorption (600 “ 900 nm), as in the case of Photofrin®. The discovery of improved photosensitisers is essential if photodynamic therapy is to become more common and successful than …
-
Squaramide-Naphthalimide Conjugates as Potential Self-Assembled Materials and as DNA Binders
… including VT-NMR, UV absorbance time studies, extinction coefficient studies and Scanning Electron Microscopy. Chapter 4 discusses the possible DNA binding ability of the novel synthesised compounds using UV-Vis absorbance, fluorescence and Ethidium Bromide Assays. Chapter 5 gives an overall …
-
Modulated Magnetic Field Effects, Molecular Design, and Indigoids: A Mechanistic Study of Singlet Fission
… due to their superior photostability, high extinction coefficient, and ideal predicted triplet energy. We explore these new, versatile, potential molecular families for their singlet fission capability. Furthermore, we discuss an alternative molecular design principle for creating singlet …
-
PHYSICOCHEMICAL STUDIES ON THE CATALYTIC AND REGULATORY SUBUNITS OF RIBONUCLEOTIDE REDUCTASE FROM CALF THYMUS
… to intact enzyme results in an increase in the extinction coefficient of the visible chromophore. This spectral enhancement may reflect a shift in equilibrium toward an active protein M1-M2 complex and/or a structural change at the chromophore. EPR spectroscopic experiments at 77 K did not …
-
Stress in ion-beam assisted silicon dioxide and tantalum pentoxide thin films
… composition, refractive index njoonm and extinction coefficient ksoonm) was investigated.A scanning method, based on substrate curvature measurements by laser reflection and stress calculation using the Stoney equation, was employed.RBS showed that stoichiometric Ta205 films contain …
Page 1 of 3