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.
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Showing 1 to 19 of 19 for “"intensity variation"”.
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A night airglow study of the hydroxyl (OH) rotational-vibrational molecular spectra in the (8,3) sequence and its diurnal temperature and intensity variation.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Alignment of contrast enhanced medical images
… images in which there are multiple contrast variations is difficult. The reason for this is that the popularmeasures of image similarity used to drive the alignment procedure do not separate the influence of intensity variation due to image feature motion and intensity variation due to …
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Focused orientation of campaniform sensilla on Periplaneta americana L. (Orthoptera: Blattidae) trochanters and femurs
… parallel on a common stimulus origin, stimulus intensity, variation of the propagation pathway lengths, and cuticle conformation between the stimulus origin and campaniform sensilla may effect the temporal depolarization patterns. Within parallel and series focuses, low and high stimulus …
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Optical display of the Airy function and transient wave propagation in a dispersive medium
… can observe a Fourier transformed image of which intensity variation is identical to that of the Airy function. A lens system is used to achieve the Fourier transformation of the object which is a two-dimensional binary filter. A set of computer simulations are performed prior to the optical …
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ΦΑΣΜΑΤΟΣΚΟΠΙΑ ΔΙΕΓΕΡΜΕΝΩΝ ΗΛΕΚΤΡΟΝΙΑΚΩΝ ΚΑΤΑΣΤΑΣΕΩΝ ΤΩΝ ΠΙΚΟΛΙΝΩΝ
… OF BENZENE, TOLUENE AND PYRIDINE. FROM THE LINE INTENSITY VARIATION OF THE RAMAN SPECTRA (WHICH WERE TAKEN IN THE LIQUID PHASE) WITH THE WAVELENGTH OF THE INCIDENT LASER LIGHT WE FOUND OUT THE EXISTENCE OF VIBRONIC COUPLING BETWEEN NΠ* AND THE FIRST EXCITED ΠΠ* ELECTRONIC STATE THROUGH THE …
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High-Speed and Power Efficient Integrated Electro-Optic Modulators
… a silicon add-drop MRR modulator. The measured intensity spectra for different bias voltages show that, our proposed phase shifter combining the through and the drop ports show ∼4.29 dB less maximum intensity variation compared to the maximum intensity variation observed at the through port for …
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Humidity sensing by optically interfacing with spectrally absorptive materials
… to provide referencing to eliminate common mode intensity variation. The basic design, construction and testing of an experimental sensor in the humidity region 20 to 80% RH and temperature range 25 to 50 °C is described. Resolution and Repeatability can be better than 2% RH with a time constant …
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Low threshold random lasing from phase separated optical fibers.
… increasing input power, and temporal spectral variation. The random lasing action was confirmed both by the use of RF beat spectra measurements and the trends in the Lévy exponent α obtained from the statistics of spectral intensity variation. Cutback experiments carried out shed light on the …
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Towards a unified treatment of 3D display using partially coherent light
… display, creating 3D images with increased intensity variation along depth. Finally, this thesis investigates the tradeoffs involved with multiplexing a holographic display over time with well-known strategies of multiplexing over space, illumination angle and wavelength. The examination of …
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Studies of diamond film growth using atom beam sources
… investigated as a function of temperature and intensity. A model has been developed which explains both the temperature and intensity variation of the graphite sputtering yield. The etch rate of diamond has been shown to possess a temperature dependence not previously reported. A new atom …
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Population Dynamics In A Model Closed Ecosystem
… investigated using oscillations in illumination intensity. Densities of C. reinhardtii and, surprisingly, E. coli respond to modest perturbations of light intensity. Variation of the modulation frequency strongly implicates the circadian clock of C. reinhardtii in its response. The nonlinearity …
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Prior Information Guided Image Processing and Compressive Sensing
… priors, high frequency priors, spatially variant intensity variations and image regularities, assists to establish mathematical models by providing a more accurate description of the underlying signal/image. We have been exploring applications of the extracted prior information in two directions: …
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Experimental and theoretical study of an integrated silicon Mach-Zehnder interferometer for chemical sensing applications
… the sensor is also determined from the plot of intensity versus concentration, which is around 0.013 (%ml)^{-1} and 0.007 (%ml)^{-1} for the white light source and the 1.5 ~tm broadband source, respectively, while the lowest detectable concentration of ethanol for the sensor detection is around …
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Optical nonlinear effects and photon pair production in modulated materials
… modulation. Modulated waveguides provide an intensity variation of the pulse along the waveguide. Two different materials are used as substrate material for the waveguides; gallium lanthanum sulphide (GLS), which has a high third order nonlinear susceptibility and fused silica. We present …
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A Remote Observatory for Geocoronal Hydrogen Emissions
… of seasonal trends in Balmer-a emission intensity diurnal variation. This investigation serves as a demonstration of the scientific contributions that the INSpIRe observatory is capable of providing and shows, for the first, a seasonal trend in the evening-to-morning variation of H-a …
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PARALLEL ELECTRIC FIELD ON AURORAL MAGNETIC FIELD LINES
… significantly. The spatial structure and intensity variation of the global (phi)(,(PARLL)) distribution are statistically more variable, and the magnitudes of (phi)(,(PARLL)) have smaller correlation with the AE-index, in the post-midnight to dawn sector. A strong correlation is found to …
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Growth, spectroscopy and utilisation of novel low dimensional nanostructures: carbon nanotubes and quantum dots
… 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 exposed to HF vapour. As this method …
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Place as Occupational Histories: Towards an Understanding of Deflated Surface Artefact Distributions in the West Darling, New South Wales, Australia
… the concepts of artefact use life, curation, the intensity of raw material utilisation and occupation intensity are used. These permit the investigation of assemblage accumulation as a temporal process. Assemblages are not thought of as synchronic functional sets but rather as the consequence of …
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Performance of Columnar Reinforced Ground during Seismic Excitation
Deep soil mixing to construct stiff columns is one of the methods used today to improve performance of loose ground and remediate liquefaction problems. This research adopts a numerical approach to study seismic performance of soil-cement columnar reinforcements in loose sandy profiles. Different …