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3.3kV矿用电器关合、开断检验装置研制方案 被引量:4
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作者 秦燕 《煤炭技术》 CAS 北大核心 2014年第6期156-158,共3页
3.3 kV矿用电器关合、开断检验装置(以下简称装置)是考核煤矿防爆电器产品在正常工作和短路状态下能否可靠分断供电线路且电器不发生触头熔焊、拉弧及其它可引起电气绝缘降低的情况,确定电器开关产品的最大负荷分断能力。针对我国煤炭... 3.3 kV矿用电器关合、开断检验装置(以下简称装置)是考核煤矿防爆电器产品在正常工作和短路状态下能否可靠分断供电线路且电器不发生触头熔焊、拉弧及其它可引起电气绝缘降低的情况,确定电器开关产品的最大负荷分断能力。针对我国煤炭行业尚无3.3 kV煤矿防爆电器产品安全性能检验手段,研究建立3.3 kV矿用电器关合、开断检验装置,为我国煤矿3.3 kV系统提供一个完善的供电安全研究实验基地。 展开更多
关键词 关合、开断检验装置 负载阻抗 感试验母线 低保装置 陪试装置 转换装置 电压等级换接装置 操作控制装置
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Effects of Magnetic Field on the Quality of Chicken Semen Stored at Low Temperature 被引量:4
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作者 安芳兰 杨保田 +8 位作者 张兆旺 黄成定 宋玉霞 董金杰 武发菊 董文教 黄银君 牟克斌 刘学荣 《Agricultural Science & Technology》 CAS 2009年第1期108-110,共3页
[ Objective] The study aimed to explore the effects of magnetic treatment on the quality of chicken semen stored at low temperature. [ Method] 5 ml fresh chicken semen was divided into five groups equally, each of whi... [ Objective] The study aimed to explore the effects of magnetic treatment on the quality of chicken semen stored at low temperature. [ Method] 5 ml fresh chicken semen was divided into five groups equally, each of which was diluted at the volume ratio 1:4. With the group without magnetic treatment as the control, the other four groups were magnetized for 6, 12, 24 and 48 min in the self-made magnetizer, respectively. Subsequently, all the five groups were stored at 2 -4 ℃, and the sperm motility, survival time, survival index and deformity rate were observed regularly. [ Result] Comparing with the control group, the magnetic groups showed higher sperm motilities and effective survival indices as well as lower deformity rates. The effective survival index of the group magnetized for 24 min was the highest and increased by 7.75% in con- trast to the control. [ Conclusion] Magnetic treatment can effectively enhance the quality of chicken semen stored at low temperature. 展开更多
关键词 MAGNETIZATION Sperm motility Deformity rate Survival index Survival time
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