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Aspects of interstellar and circumstellar silicon chemistryMacKay, D. D. S. January 1996 (has links)
No description available.
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Infrared diffuse reflectance spectroscopyIbbett, R. N. January 1988 (has links)
No description available.
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SENSITIVITY OF DIFFUSE CORRELATION SPECTROSCOPY TO FLOW RATES IN TISSUE-SIMULATING OPTICAL PHANTOMSZanfardino, Sara Marie 01 August 2018 (has links)
No description available.
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The use of stochastic simulation to investigate trends in the water quality of the River Clyde catchment areaMcAlpine, Janette Donald January 1999 (has links)
No description available.
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Comparative seedling growth of diffuse knapweed and bluebunch wheatgrass under altered moisture and temperature regimesGrammon, Arnold A. 08 December 1997 (has links)
In many areas of the Western U.S., diffuse knapweed (Centaurea diffusa Lam.)
has invaded into plant communities dominated by bluebunch wheatgrass
(Pseudomegnaria spicata [Pursh] A. Love). The objectives of this study were to compare
growth response of both species when grown under altered moisture and temperature
regimes while in the seedling stage and to further elucidate the competitive ability of
diffuse knapweed compared to bluebunch wheatgrass. Isolated individuals were grown
in four different environmental chamber conditions (12 hr day length, 10 and 16C and -0.01 MPa and -0.03 MPa soil moisture). Diffuse knapweed penetrated quicker than
bluebunch wheatgrass starting on day 20, regardless of temperature and moisture and
knapweed penetration was greatest under warm and wet soil conditions. Bluebunch
wheatgrass developed more root length initially under warmer and drier conditions, but
those differences diminished after thirty days growth. Warmer and wetter soil conditions
favored diffuse knapweed leaf area production in later stages of seedling growth. Diffuse
knapweed had more rapid root penetration than bluebunch wheatgrass under the
conditions studied. Diffuse knapweed maximized shoot production, indicative of a
relatively fast growing species, while bluebunch wheatgrass maximized root production,
characteristic of a relatively slow growing species. Diffuse knapweed seedlings grew
best under warmer and wetter conditions. Comparing plant efficiency (indices of plant
efficiency based on the measurement of a plant attribute divided by the total biomass of
the plant), diffuse knapweed was apparently more efficient than bluebunch wheatgrass at
producing the competitive attributes of root penetration, leaf area and root length. / Graduation date: 1998
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Skin cancer detection by oblique-incidence diffuse reflectance spectroscopySmith, Elizabeth Brooks 15 May 2009 (has links)
Skin cancer is the most common form of cancer and it is on the rise. If skin cancer is
diagnosed early enough, the survival rate is close to 90%. Oblique-incidence diffuse
reflectance (OIR) spectroscopy offers a technology that may be used in the clinic to aid
physicians in diagnosing both melanoma and non-melanoma skin cancers. The system
includes a halogen light source, a fiber optic probe, an imaging spectrograph, a charge
coupled device (CCD) camera, and a computer. Light is delivered to the skin surface via
optical fibers in the probe. After interacting with the skin, the light is collected and sent
to the spectrograph that generates optical spectra. Images and histopathological
diagnoses were obtained from 250 lesions at the University of Texas M.D. Anderson
Cancer Center (Melanoma and Skin Center). To classify OIR data, an image processing
algorithm was developed and evaluated for both pigmented and non-pigmented lesions.
The continuous wavelet transform and the genetic algorithm were employed to extract
optimal classification features. Bayes decision rule was used to categorize spatiospectral
images based on the selected classification features. The overall classification
accuracy for pigmented melanomas and severely dysplastic nevi is 100%. The overall classification accuracy for non-pigmented skin cancers and severely dysplastic nevi is
93.33%. Oblique-incidence diffuse reflectance spectroscopy and the developed
algorithms have high classification rates and may prove useful in the clinic as the
process is fast, noninvasive and accurate.
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Measurement and prediction of the wideband indoor radio and infrared channelsMavrakis, Dimitrios January 2002 (has links)
This thesis is focused on a study on modeling and measurement of the indoor radio and infrared channels. Both channels have been studied, compared and their vital differences identified. Initially, an infrared channel model was developed that was not similar to any existing models for the infrared domain. The wireless diffuse infrared channel is solely used indoors and is usually confined within a room. Conventional channel models are described, but their disadvantage is heavy time and processor requirements. A new model is introduced, in which the approach is different from the traditional methods in the way that it discretises the delay range instead of the physical characteristics of the environment. The new model offers accurate results without the increased time and processor requirements compared with traditional techniques. Following the characterisation of the infrared channel, a wideband radio propagation campaign took place in two different buildings that allowed valuable insight into the mobile radio channel. Time domain analysis of the measurement results allowed the careful study of the radio channel and produced interesting results as far as RMS delay spread and Power Delay Statistics are concerned. It has been shown that the RMS delay spread is not always dependent on antenna separation, while it was found to be highly dependent on the clutter present on the measurement environment. The infrared model was finally converted to account for radio propagation. Traditional channel models for indoor propagation prediction are described, while the major differences of the infrared and radio channel are mentioned. The radio channel prediction benefits from the accuracy of the infrared model, where a very high accuracy is necessary in order to predict the effect of scattering. A simple measurement campaign has been introduced in order to validate the results of the simulation tool and a comparison with the most important wideband channel models has been performed, along with higher frequency measurements where scattering is more important. The results present a good fit to the measurements and models in the literature, and empirical conclusions relative to the scattering characteristics of the radio channel are drawn from these comparisons.
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Time Resolved Flourescence and Diffuse Reflectance Measurements for Lung Squamous Carcinoma Tumor Margins / OPTICAL PROPERTIES FOR LUNG CANCER MARGIN DETECTIONCosta, Sarah January 2023 (has links)
Lung cancer is the leading cause of death from cancer in Canada and is typically treated with surgical resection of the tumor. To ensure good prognosis and limit metastases no cancer cells can be left behind during resection. This project uses time-resolved fluorescence and diffuse reflectance to differentiate cancerous and non-cancerous lung tissue. These differences could be used during surgical resection of tumor to ensure no positive margins are present. Using a bi-modal spectroscopy device, BEAR, optical properties were determined for 36 tumor, 36 fibrotic and 9 normal lung tissue samples. Most optical parameters showed statistically significant differences between tumor and other tissue types. Metabolic based optical parameters showed statistically significant differences between fibrotic and normal tissue while non-metabolic based parameters showed no difference. As surgical margins are likely to be between tumor and fibrotic tissue the results demonstrate success and promise for implementing this system. Future work using fresh samples would develop the system further and would be a step closer to in vivo use during surgery. / Thesis / Master of Science (MSc) / Lung cancer is the leading cause of death from cancer and is typically treated by surgically removing the tumor. To improve survival all cancer cells must be removed which can be challenging. This project uses light to extract properties that can differentiate cancerous and non-cancerous lung tissue. These differences could be used during surgery to ensure no cancer cells remain. The project tests this system on 36 tumor, 36 fibrotic and 9 normal lung tissue samples. Most parameters showed significant differences between tumor and other tissue types. Given that often times the surgical boundaries are between tumor and fibrotic tissue the results demonstrate promise in implementing this system. Future work using fresh samples would develop the system further and bring it one step closer to being used during surgery.
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CONVOLUTIONAL CODING FOR HR RADIO TELEMETRY SYSTEMXianming, Zhao, Tingxian, Zhou, Honglin, Zhao, Qun, Lu 11 1900 (has links)
International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada / This paper discusses an error-correcting scheme applied to a telemetry system over
HF radio channel. According to the statistical properties of transmission error on HF
radio channel, the scheme uses one important diffuse convolutional code, which is
threshold decoded and corrects the random or burst errors. The operation of this code
is explained, and a new method for word synchronization and bit synchronization is
proposed. Coding and decoding, word synchronization, and bit synchronization are all
activated by software program so as to greatly improve the flexibleness and
applicability of the data transmission system. Test results of error-correcting are given
for a variety of bit-error-rate (BER)s on HF radio channel.
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Linear wave propagation in traumatic brain injuryBradshaw, Douglas Robert Saunders January 2001 (has links)
No description available.
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