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| 1 | Adjustable character of microwave attenuation in BaTiO_3 electrorheological fluids显示文摘The behavior of microwave attenuation in BaTiO3 electrorheological fluids is studied when considering microwave propagation in the directions perpendicular and parallel to the particle chains, respectively. In the former case, the microwave attenuation increases with field strength when the particle concentration is low, and the increase of the particle concentration can also increase the microwave attenuation. However, when the particle concentration exceeds a critical value, the attenuation will first increase then decrease with field strength. At the same time, the higher the field strength, the greater the change of microwave attenuation. Moreover, there is a saturation field strength. When the field strength is lower than the saturated one, the change of microwave attenuation is fast. On the other hand, in the case of microwave propagation parallel to the particle chains, the microwave attenuation increases with the field strength monotonously. In addition, the variation of microwave attenuation with the field strength shows relaxation effect. The adjustable character of microwave attenuation in BaTiO3 ER fluids can be attributed to the dielectric changes resulting from the field-induced-structural transformation and the polarization of BaTiO3. | FAN Jijun, ZHAO Xiaopeng , HUANG Min, GUAN Litao and WEN Lishi(1. Institute of Electrorheological Technology, 141# Northwestern Polytechnical University, Xi’an710072, China 2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) | 2002 | Progress in Natural Science:Materials International2002，12，10： | 6 |
| 2 | A comparative evaluation of polytetrafluoroethylene, umbilical vein, and saphenous vein bypass grafts for femoral-popliteal above-knee revascularization: A prospective randomized Department of Veterans Affairs cooperative study显示文摘 | Willard C. Johnson Kelvin K. Lee members of the Department of Veteran Affairs COOP Study 141 | 2000 | Journal of Vascular Surgery2000，，： | 2 |
| 3 | Predicting angiography induced acute renal function impairment clinical risk model [ J ]A JR显示文摘 | Coehran ST Wong WS Roe DT 141 (5) | | 0，，： | 1 |
| 4 | THERMO': COMPUTER PROGRAM FOR SIMULATION OF SURFACE PULSE HEATING显示文摘Thermo' computer program is described. It is intended for computation of thermal cycle parameters during surface pulse heating. For example, during laser processing, surface heating owing to grinding, etc. It gives rates of heating, cooling, as well as temperature gradients and cumulative exposure time as function of the CURRENT TEMPERATURE, with the peak temperature at the surface as variable parameter. The indicated parameters are calculated at a surface, close to a surface (at 0.01μm)and for the points at a depth of the body. Demo ver. of the software: http://www. sstu.samara.ru/physics/fedosov/thermo_d. | S. Fedosov Samara State Technical University, Galaktionovskaya 141, Samara 443010, Russia | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，2： | 0 |
| 5 | RETAINED AUSTENITE IN LASER PROCESSED STEELS显示文摘This paper Presents experimental data on effect of carbon concentration and laser processing regimes on retained austenite quantity. The data on retained austenite decomposition during subsequent temperings at various temperatures as well as after holding at room temperature during 3 years are given.Correla- tion between structural broadening of the X - ray lines of retained gamma - phase and the amount of the latter has been discovered.Mechanisms responsible for the increased quantity of the retained austen- ite in carbon and low alloyed steels after laser hardening are described. | S. Fedosov (Samara State Technical University, Galaktionovskaya 141, Samara 443010, Russia) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 0 |
| 6 | LASER WELDING OF BEARING PROTECTIVE WASHERS显示文摘Spot laser welding was applied for fastening of protective bearing washers.Corresponding technology and laser welding plants are described. Correlation between appearance of the spot welds and their quality was discovered. Mechanism of the welding distortion has been revealed. | S. Fedosov (Samara State Technical University, Galaktionovskaya 141, Samara 443010, Russia) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 0 |
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