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 75 for “"absorption coefficients"”.
-
Absorption coefficients in light oil scrubbers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1941.
-
X-Ray Mass Absorption Coefficients and Quantitative Microanalysis of Metallurgical Systems, Including Refractory Metal-Interstitial Compounds
Made available in DSpace on 2015-05-12T21:41:02Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6915311.PDF: 5848870 bytes, checksum: 73fd9ba07647a2d4ba87b7fd356e0474 (MD5) Previous issue date: 1969
-
Exploring Novel, Hard, Acoustically Absorbent, Materials
… used to analyze the mid-frequency octave band absorption coefficients of various re-purposed existing materials and tiles created utilizing 3D print technology and Helmholtz resonators. Additionally, an empirical study of Helmholtz resonator geometry was performed by analyzing the sound …
-
The in situ compressional wave properties of marine sediments
… group velocities, greater effective attenuation coefficients and lower quality factors than silts, while the low velocities measured in silts imply that the bulk moduli of the silt sites examined are lower than expected owing to a considerable fraction of organic matter. Significant variations …
-
Marsh-Exported Dissolved Organic Matter Fate in Estuaries
… were measured using spectrophotometry (CDOM absorption coefficients and spectral slopes) and spectrofluorometry (FDOM excitation-emission matrices analyzed using parallel-factor analysis, PARAFAC). 0.2 μm filters were used for “photochemical-only” treatments, whereas glass-fiber filters …
-
Optical Properties of Type III-V Semiconductor Spherical Quantum Dot Heterostructures
… QD solar cells. Proper analysis of the optical absorption characteristics in these solar cells requires a rigorous modeling of the electronic structure and optical properties of semiconductor heterostructures. Our emphasis will be on type III-V semiconductors. Such structures, have a great …
-
An investigation of the structurally induced acoustic field in a car passenger compartment
… items of trim are added to the model as acoustic absorption coefficients to show the Significance of trim in reducing low frequency boom in car passenger compcompartments. The necessary absorption coefficients were measured with an impedance tube.
-
Geometric Acoustic Modeling of the LDS Conference Center
… preliminary models of the hall using published absorption coefficients for its surfaces and approximate scattering coefficients based on current best-known techniques. A detailed analysis determined the minimum numbers of rays needed in both packages to produce reliable results with these …
-
Quasi-Two-Dimensional Phenomena at Aluminum-Gallium - Arsenide - Gallium-Arsenide Heterointerfaces: Multiple Quantum Wells and Modulation-Doped Structures (Superlattice, Modfet, Semiconductors)
… quantum well systems are described: optical absorption coefficients and exciton oscillator strengths in AlGaAs-GaAs multiple quantum wells are greatly enhanced as well widths become narrower: this effect is in excellent agreement with recent calculation. Additionally acceptor energies in …
-
An optical study of lithium and lithium-oxygen complexes as donor impurities in single crystal silicon
… problem. The data is presented in the form of absorption spectra in which the absorption coefficients are due only to the absorption centers introduced into the silicon samples during the diffusion process. The instrumental band width ( full width at half maximum) is indicated in each case for …
-
Bridging the Modeling-Sampling Gap for Mid-Infrared Reflectance Spectroscopy of Small Particles, Films, and Fibers
… reflection microspectroscopy; results show that absorption has a non-linear, stair-step-like dependence on particle coverage and a wavelength dependence that can be explained by electric field standing waves (EFSW) caused by the mirrored substrate.</p> <p>The same effect is found to cause …
-
Spatially resolved light propagation in tissue-like media
… and algorithm for deriving the scattering and absorption coefficients for a spatially resolved reflectance apparatus was developed, characterized, and tested. In models with tissue-like properties, this protocol and algorithm works to derive the appropriate scattering and absorption …
-
Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… from the cavity was used to measure broadband absorption spectra of gaseous azulene through (i) time-dependent cavity ring-down (CRDS), and (ii) intensity-dependent incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) methodologies. Based on the broadband ring-down time of …
-
Optical absorption measurements on silver halides in the ultraviolet and extreme ultraviolet energy ranges
The absorption coefficients of silver chloride and silver bromide have been determined from thin film transmission measurements in the range of photon energy from 3.5 to 6.7 electron volts and from 30 to 240 electron volts. An unusual feature of this work is the use of electron synchrotron …
-
Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules
… z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules.
-
The study of plasmonics in nanohole metallic metamaterials
… thesis. Previous derivations of transmission and absorption coefficients show that the transmission is only dependent on the periodicity of the nanohole array. However, numerous simulated and experimental results have shown that the periodicity and hole size have an effect on the transmission and …
-
ΣΥΝΕΙΣΦΟΡΑ ΤΗΣ ΕΠΕΞΕΡΓΑΣΙΑΣ ΕΙΚΟΝΑΣ ΣΤΗ ΦΥΣΙΚΟΧΗΜΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΒΥΖΑΝΤΙΝΩΝ ΚΑΙ ΜΕΤΑΒΥΖΑΝΤΙΝΩΝ ΕΙΚΟΝΩΝ. ΜΕΤΡΗΣΗ ΤΟΥ ΣΥΝΤΕΛΕΣΤΗ ΑΝΑΚΛΑΣΤΙ...
… NEW METHOD FOR CALCULATION OF THE SCATTERING AND ABSORPTION COEFFICIENTS (S.K), WHICH CHARACTERIZE THE PHYSICOCHEMICAL BEHAVIOUR OF PAINT LAYERS, IS PROPOSED. THIS METHOD ISBASED ON THE APPLICATION OF INFRARED REFLECTOGRAPHY IN COMBINATION WITH THE IMAGE PROCESSING TECHNIQUES USING A SPECIALLY …
Page 1 of 4