排序方式: 共有62条查询结果,搜索用时 15 毫秒
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根据森林火灾的成因三要素和蔓延方式提出空爆航弹灭火的理论.为论证说明空爆航弹灭火理论的科学性,从四方面进行了论述并予以佐证. 相似文献
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避雷器是变电站保护电气设备免遭雷电冲击波袭击的设备。当沿线路传入变电站的雷电冲击波超过避雷器保护水平时,避雷器首先放电,并将雷电流经过良导体安全的引入大地,利用接地装置使雷电压幅值限制在被保护设备雷电冲击水平以下,使电气设备受到保护。 相似文献
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王长青 《畜牧兽医科技信息》2003,19(12):52-52
一种通过电击产生水力的冲击波而提高猪肉嫩化度的方法已在美国实施。一位威斯康星州麦迪逊大学的肉品科学家解释说,冲击波破坏了肌肉细胞的部分纤维,这个过程不仅嫩化了肉,而且提高了肉系水和持水的能力。用冲击波嫩化肉的尝试要 相似文献
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YANG De-ji O Sasaki M Minezawa K Nirasawa H Takahashi 《中国农业科学(英文版)》2010,9(4):593-597
Broken and cracked eggshells cause major economic losses to the egg production industry. An F2 population of 262 hens obtained by crossing a strong egg shell line with a weak egg shell line of the White Leghorn breed was used for detecting the quantitative trait loci (QTL) affecting eggshell quality. The 2 lines were developed from the same founder population by two-way selection for egg shell strength with nondestructive deformation. Of the 1 014 microsatellite markers tested, 35 were mapped on 10 autosomal linkage groups. There was no informative marker on chromosome Z. The QTLs associated with 7 traits, i.e., body weight, short length of egg, long length of egg, eggshell strength, eggshell thickness (EST), eggshell weight (ESW), and egg weight (EW), were identified. Highly significant (P〈0.01) QTLs associated with EST and ESW and a significant (P〈 0.05) QTL associated with EW were mapped to a region flanking ABR0545 and ABR0362 on chromosome 9. These QTLs are good candidates to be employed in the development of strategies for reducing the number of broken and cracked eggs in commercial layer houses by employing marker assisted selection. 相似文献
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