Orientador : Jose Aristodemo Pinotti / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas / Made available in DSpace on 2018-07-16T06:44:19Z (GMT). No. of bitstreams: 1 Sarian_MarizaZanatta_D.pdf: 1800225 bytes, checksum: d08007859df9db9bfd9627ada3360472 (MD5) Previous issue date: 1976 / Resumo: Não informado / Abstract: Not informed / Doutorado / Doutor em Ciências Médicas

Orientador: Carlos Henrique de Brito Cruz / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-07-18T11:37:10Z (GMT). No. of bitstreams: 1 Triques_AdrianaLuciaCerri_M.pdf: 1732314 bytes, checksum: 09e6e49f9b71fca15539363165d3b507 (MD5) Previous issue date: 1992 / Resumo: O trabalho consiste na construção de um sistema para a amplificação da energia dos pulsos produzidos por um "Colliding Pulse Mode-Mocked Dye Laser" (CPM), e um sistema para a sua compressão temporal. Os pulsos produzidos pelo CPM apresentam duração de 50 fs, largura de linha de 8 nm e energia de 100 pJ. O resultado da amplificação são pulsos com 2 mJ de energia. O sistema compressor se utiliza desses pulsos amplificados para produzir pulsos com largura espectral de 70 nm e duração de 12 fs. O sistema amplificador consiste na passagem dos pulsos laser a serem amplificados por uma cela do corante Sulforhodamina 640, com 3 mm de espessura, que é bombeada por um laser de vapor de Cobre. No total são seis passagens do pulso do laser CPM pelo meio amplificador. A energia do pulso é amplificada por 2 x 104 vezes, e desta forma obtemos pulsos com energia de 2 mJ a uma taxa de 5 kHz. A compressão temporal é realizada em duas etapas. Na primeira, utilizamos 15% da energia dos pulsos amplificados para gerar automodulação de fase numa fibra óptica monomodo e alargar o espectro de freqüências dos pulsos por um fator 8. Obtemos, desta forma, pulsos com um espectro contínuo estendendo-se de 550 nm a 720 nm, com 70 nm de largura à meia altura. Na segunda etapa, os pulsos com espectro contínuo são enviados a um sistema composto por um par de grades de difração na configuração de Littrow, para a compensação das distorções de fase introduzi das pelo sistema de alargamento espectral. Os pulsos resultantes possuem uma duração de 12 fs e largura espectral de 70 nm / Abstract: This thesis describes the construction and operation of a femtosecond optical pulse amplifier and compressor system. The short pulses are generated by a Colliding Pulse Mode-Locked Dye Laser and have a duration of 50 fs at a repetition rate of 100 MHz. The amplifier uses a multipass configuration and is pumped by a Copper vapor laser. The amplified pulses have 2 mJ and run at 5 kHz. Pulse compression is achieved using a short lenght of optical fiber to broaden the spectral width of the amplified pulses, followed by a dispersive delay line composed by a pair of diffraction gratings. The shortest pulses obtained sofar have 12 fs and will be used in time resolved studies in condensed matter / Mestrado / Física / Mestre em Física

Metal detection systems currently available to the general public ordinarily verify the presence of conductive material, not the shape. Shape detection is important for discrimination between dangerous and benign items. Test setups are developed useful for identifying the value of microwaves for shape detection behind selected material types. The behavior of this electromagnetic energy in homogeneous, isotropic, locally linear, temporally dispersive material is examined in the time and frequency domains. The results of the evaluations determine the behavior of continuous-wave microwave radiation and microwave pulses in such media. A unique method is then developed for detecting the shape of concealed conductive objects utilizing pulsed microwave ultrawideband spectra.

The structure-property relationships of Ultra-High Performance Concrete (UHPC) were quantified using imaging techniques to characterize the multiscale hierarchical heterogeneities and the mechanical properties. Through image analysis the average size, percent area, nearest neighbor distance, and relative number density of each inclusion type was determined and then used to create Representative Volume Element (RVE) cubes for use in Finite Element (FE) analysis. Three different size scale RVEs at the mesoscale were found to best represent the material: the largest length scale (35 mm side length) included steel fibers, the middle length scale (0.54 mm side length) included large voids and silica sand grains, and the smallest length scale (0.04 mm side length) included small voids and unhydrated cement grains. By using three length scales of mesoscale FE modeling, the bridge of information to the macroscale cementitious material model is more physically based.

No description available.

No description available.

With the increasing interest in the indoor air environment over the last 30 years has come the need for control devices that can improve the quality of air that people breath. To answer this need, many devices have been developed and are currently in use. This thesis utilizes Ultra-violet light to eradicate the bacteria. A portable unit was constructed that contains the light bulb and fan. Two different trials were conducted: Controlled Laboratory trials and Fish Culture Room Trials. The Controlled Laboratory Experiments were conducted in order to test the effect that the Ultra-violet unit had on known cultures of bacteria while the Fish Culture Room Trials were conducted to test the chambers affect on a real indoor situation. The Ultra-violet unit was effective in eradicating the known cultures that were tested, and was less effective in the real indoor setting. As the density of bacteria increased, the effectiveness of the chamber increased, for the real indoor setting. The contact time of the chamber could be adjusted to improve effectiveness. More testing is necessary to fully evaluate the potential of a portable Ultra-violet disinfection chamber. / Master of Science

A technique for wall compensation in the ultra-wideband (UWB) through-wall imaging radar is presented. The UWB system can be utilize in high precision measurements, but due to phase distortion and amplitude attenuation caused by the wall the precision is limited, the target is displaced, and the image is defocused.  In order to mitigate the wall effects, two methods are applied in this project. First, the unknown wall transfer function is estimated using real data measurements to design the inverse filter. Secondly, FIR Wiener filter is designed to improve the received m-sequence. After all, each method is tested using three parameters, the signal to noise ratio (SNR), the signal to clutter ratio (SCR), and the relative position error (RPE).  The inverse filter can eliminate the wall effects very well; it could correct not only the position of the target but also the image defocus. The new method can give improve the image quality and that can extend the use of UWB radar in many applications.

published_or_final_version / abstract / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

An experiment was conducted at the University of Arizona Maricopa Agricultural Center, Maricopa, Arizona in 1999 to compare and evaluate agronomic and economic differences between Ultra Narrow Row (UNR) and conventional cotton row spacing systems with respect to yield, fiber quality, earliness potential, plant growth and development, and production costs. Row spacing was 10 and 40 inches for the UNR and conventional systems, respectively. Two varieties were evaluated within each row spacing, Sure Grow 747 (SG 747) and Delta Pine 429RR (DP 429RR). Lygus populations were extremely high in the Maricopa, Arizona region in 1999 which resulted in poor fruit retention from early through mid-season. As a result of poor boll load through mid-season, the UNR plots were irrigated and grown later into the season than desired along with the conventional cotton in order to set and develop a later season boll load. The mean lint yield averaged across row spacing was significantly greater (P=0.05) in the UNR row spacing at 1334 lb/A than for the conventional row spacing at 1213 lb/A. SG 747 produced 1426 and 1337lb/A of lint in the UNR and conventional systems, respectively. DP 429RR produced 1242 and 1089 lb/A of lint in the UNR and conventional systems respectively. Fiber grades were all 21 or 31 in both UNR and conventional systems. Micronaire was 4.9 or less in both varieties within the UNR system. Micronaire was high at 5.3 in the conventionally produced SG 747 resulting in discount but was acceptable at 4.7 in the conventionally produced DP 429RR. Length and strength measurements met base standards in all cotton variety and row spacing combinations. Neither the conventional or the UNR cotton production systems were profitable due primarily to high chemical insect control costs and early season boll loss. However, UNR production costs were lower by $0.09 per pound than in the conventional system on a cash cost basis and $0.14 per pound lower when considering total costs including variable and ownership costs.