1,479 research outputs found
Case report: hypertrophic osteopathy associated with disseminated metastases of renal cell carcinoma in a dog
No full textThermal studies of D.C. traction motors
No full textThis paper describes a thorough thermal study on a fleet of DC traction motors which were found to suffer from overheating after 3 years of full operation. Overheating of these traction motors is attributed partly because of the higher than expected number of starts and stops between train terminals. Another probable cause of overheating is the design of the traction motor and/or its control strategy. According to the motor manufacturer, a current shunt is permanently connected across the motor field winding. Hence, some of the armature current is bypassed into the current shunt. The motor then runs above its rated speed in the field weakening mode. In this study, a finite difference model has been developed to simulate the temperature profile at different parts inside the traction motor. In order to validate the simulation result, an empty vehicle loaded with drums of water was also used to simulate the full pay-load of a light rail vehicle experimentally. The authors report that the simulation results agree reasonably well with experimental data, and it is likely that the armature of the traction motor will run cooler if its field shunt is disconnected at low speed
Effect of the electromagnetic environment on the dynamics of charge and phase particles in one-dimensional arrays of small Josephson junctions
No full textC.T. Vivian, Joseph E. Lowery, and Tom Brown, circa 1980
No full textSouthern Christian Leadership Conference President Joseph E. Lowery is shown standing outside with C.T. Vivian (left) and Tom Brown (right) at Paschal's Motor Hotel.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the Joseph & Evelyn Lowery Institute for Justice and Human Rights, the Joseph Echols Lowery Irrevocable Trust, and other donors in supporting the processing and digitization of Morehouse College's Joseph Echols and Evelyn Gibson Lowery Collection
Transport and quantum lifetime dependence on electron density in gated GaAs/AlGaAs heterostructures
No full textWe present a study of the transport & quantum lifetime dependence on electron density in two completely di3erent kinds of two-dimensional electron gas systems. We observed that both the two scattering time increase with increasing the electron density. But the ratios of the transport to the quantum lifetime have di3erent tendency with the electron density, which do not conform to the conventional theory. We speculate that the screening e3ects need to be considered in order to explain our experimental resultsWe present a study of the transport and quantum lifetime dependence on electron density in two completely di3erent kinds
of two-dimensional electron gas systems. We observed that both the two scattering time increase with increasing the electron
density. But the ratios of the transport to the quantum lifetime have di3erent tendency with the electron density, which do
not conform to the conventional theory. We speculate that the screening e3ects need to be considered in order to explain our
experimental results
Crystal field effects in the intermetallic RNi3Ga9 (R=Tb, Dy, Ho, and Er) compounds
Full text linkIn this paper, we report temperature-dependent magnetic susceptibility, electrical resistivity, and heat-capacity experiments in the family of intermetallic compounds RNi3Ga9 (R = Tb, Dy, Ho, and Er). Single-crystalline samples were grown using Ga self-flux method. These materials crystallize in a trigonal ErNi3Al9-type structure with space group R32. They all order antiferromagnetically with TN<20K. The anisotropic magnetic susceptibility presents large values of the ratio χeasy/χhard indicating strong crystalline electric-field (CEF) effects. The evolution of the crystal-field scheme for each R was analyzed in detail by using a spin model including anisotropic nearest-neighbor Ruderman-Kittel-Kasuya-Yosida interaction and the trigonal CEF Hamiltonian. Our analysis allows one to understand the distinct direction of the ordered moments along the series - the Tb-, Dy-, and Ho-based compounds have the ordered magnetic moments in the easy ab plane and the Er sample magnetization easy axis is along the ĉ direction.Fil: Silva, L.S.. Universidade Federal de Sergipe; BrasilFil: Mercena, S.G.. Universidade Federal de Sergipe; BrasilFil: Garcia, Daniel Julio. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bittar, E. M.. Centro Brasileiro de Pesquisas Físicas; BrasilFil: Jesus, C. B. R.. Universidade Estadual de Campinas; BrasilFil: Pagliuso, P. G.. Universidade Estadual de Campinas; BrasilFil: Lora Serrano, R.. Universidade Federal de Uberlandia; BrasilFil: Meneses, C.T.. Universidade Federal de Sergipe; BrasilFil: Duque, J.G.S.. Universidade Federal de Sergipe; Brasil. Universidade Estadual de Campinas; Brasi
Suspended matters in onion farms and their potential effect on corneal injury of the harvesters
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