排序方式: 共有29条查询结果,搜索用时 359 毫秒
1.
铁路营业线施工引发的行车、人身安全事故一直困绕着一代代铁路工作者,为在列车通过前让施工人员、机具、材料等能及时撤到安全限界,确保安全'_按婴铁墅“故障一安全”原则,利用感应线圈原理、系统软件开发等手段研发铁路施工安全防护装置,增加一道安全屏障。 相似文献
2.
3.
Nonpolar (1120) a-plane GaN films have been grown by low-pressure metal-organic vapor deposition on r-plane (1102) sapphire substrate. The structural and electrical properties of the a-plane GaN films are investigated by high-resolution X-ray diffraction (HRXRD), atomic force microscopy (AFM) and van der Pauw Hall measurement. It is found that the Hall voltage shows more anisotropy than that of the c-plane samples; furthermore, the mobility changes with the degree of the van der Pauw square diagonal to the c direction, which shows significant electrical anisotropy. Further research indicates that electron mobility is strongly influenced by edge dislocations. 相似文献
4.
5.
6.
The breakdown and the current collapse characteristics of high electron mobility transistors (HEMTs) with a low power F-plasma treatment process are investigated. With the increase of F-plasma treatment time, the saturation current decreases, and the threshold voltage shifts to the positive slightly. Through analysis of the Schottky characteristics of the devices with different F-plasma treatment times, it was found that an optimal F-plasma treatment time of 120 s obviously reduced the gate reverse leakage current and improved the breakdown voltage of the devices, but longer F-plasma treatment time than 120 s did not reduce gate reverse leakage current due to plasma damage. The current collapse characteristics of the HEMTs with F-plasma treatment were evaluated by dual pulse measurement at different bias voltages and no obvious deterioration of current collapse were found after low power F-plasma treatment. 相似文献
7.
8.
珠海某地下广场房间空调的数值模拟及热舒适性分析 总被引:1,自引:0,他引:1
利用计算流体力学CFD技术对珠海某地下广场典型房间气流组织作了数值模拟,分析了两种风口布置形式对室内气流组织的影响,并比较了两种情况下热舒适度,对其进行了评价。 相似文献
9.
10.