排序方式: 共有17条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
冯喜 刘阿娣 周楚 邹晓岚 庄革 王守信 王明远 刘海庆 丁卫星 张寿彪 吴木泉 朱翔 郝保龙 张津 刘朝阳 季佳旭 仲小明 刘深 谢锦林 林晓东 黄建军 高翔 万元熙 《等离子体科学和技术》2023,(11):63-73
To interpret the common symmetric peaks caused by the large-scale structure in the complex S(f) spectrum from the heterodyne Doppler reflectometry(DR) measurement in EAST, a 2D circular-shaped O-mode full-wave model based on the finite-difference time-domain method is built. The scattering characteristics and the influences on the DR signal from various scales are investigated. When the structure is located around the cutoff layer, a moving radial or poloidal large-scale structure kθ■... 相似文献
6.
7.
对采用纯石蜡相变蓄热式与水蓄热式2种热泵热水器系统的性能进行了对比实验研究,对比分析了2种热泵热水器系统在制冷兼热回收模式下的蓄热过程、蓄热箱的冷凝热回收率以及系统的综合能效系数,在此基础上提出了改善纯石蜡相变蓄热式热水系统性能的措施。实验数据表明,与传统水蓄热式热泵热水系统相比,纯石蜡相变蓄热式热泵热水系统减小了蓄热箱的体积,蓄热过程中系统运行相对平稳,但蓄热箱的换热效果较差、冷凝热回收率相对较低,进而影响了系统的综合能效。可通过对蓄热箱内螺旋盘管进行翅片化处理或者插入铝箔、加入膨胀石墨等项措施强化蓄热箱的传热以提高冷凝热回收率,进而提高系统的综合性能。 相似文献
8.
9.
A novel low temperature co-fired ceramic(LTCC) material was fabricated by zinc titanate(ZnTiO_3) ceramics doped with B_2O_3-BaO-SiO_2-ZnO-Li_2O(BBSZL) glass. The influences of BBSZL glass on wetting behavior, sintering activation energy, phase composition, microstructure and microwave dielectric properties were investigated. The experimental results show that the sintering temperature of ZnTiO3 ceramics can be reduced from 1 100 to 925 ℃, meanwhile the sintering activation energy is decreased from 465.32 to 390.54 kJ·mol~(-1) by BBSZL glass aid, respectively. Moreover, BBSZL glass can inhibit the high Q×f ZnTiO_3 phase decompose into the low Q×f value Zn_2TiO_4 phase, which is propitious to obtain high Q×f value LTCC material. The ZnTiO_3-BBSZL composite sintered at 925℃ displays the excellent microwave dielectric properties with ε_r of 21.8, Q×f value of 42000 GHz, and τ_f of-75 ppm·℃~(-1). 相似文献
10.