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1)  double cross combination
四元杂交
1.
Comparative studies on the performance of Taihu pig double cross combinations and that of Duroc×(Landrace×Large Yorkshire) three-way cross combinations;
太湖猪内四元杂交组合与外三元杜长大组合比较试验
2.
Experiment for comparing the performance of Erhualian pig double cross combinations and that of Durocx(LandracexLarge Yorkshire) three-way cross combination;
二花脸猪四元杂交组合与杜长大三元杂交组合比较试验报告
2)  tetra hybrid
四元杂交种
1.
Report on breeding of summer autumn tetra hybrid variety Xin·Feng×Qin·Yun and its rearing performance.;
夏秋用蚕四元杂交种“新丰×青云”的选配和试养
3)  hybrid quadrilateral membrane element
四边形杂交膜元
4)  Quardrispecific hybrid
四元杂种
1.
The results showed that the meiosis of the quardrispecific hybrid F1 was abnormal, and some of the chromosomes were lost in most PMC.
用(亚洲棉×草棉)F1进行染色体加倍,再与(陆地棉×海岛棉)F1进行杂交,产生亚洲棉、草棉、陆地棉和海岛棉四元杂种。
2.
bickii)] and its reciprocal cross,as well as their backcross progenies, of the quardrispecific hybrid with A, D, G genomes were studied.
对棉属 A、D、G三个染色体组合成的三元杂种 [陆地棉× (亚洲棉×比克氏棉 ) ]及反交和回交后代 ,四元杂种 [(亚洲棉×比克氏棉 )× (陆地棉×夏威夷棉 ) ]进行了细胞学研究。
5)  quadruple cross hybrid
四杂交杂种
6)  hybrid element
杂交元
1.
A localized variational principle and hybrid element formulas for fluid-structure coupling vibrations;
流固耦合谐振分析的局部变分原理及其杂交元算式
2.
In order to solve the singular stress fields in tips of bonded dissimilar anisotropic materials,a novel hybrid element model is established.
为了求解各向异性接合材料界面端部奇异性应力场,建立了一种新型杂交元模型。
3.
Numerical examples of plane problem are presented and numerical results of 4-node hybrid elements have been compared with those of 4-node isoparametric compatible ones.
将杂交元推广于结构拓扑优化设计 ,推导了拓扑优化中数值计算和敏度分析的基本方程 ,对等参元和杂交元的拓扑优化结果进行了对照 。
补充资料:1,3,5,7-四甲基四乙烯基环四硅氧烷
分子式:[CH3(CH2=CH)SiO]4
CAS号:

性质:沸点224~224.5℃(101.06kPa)。熔点-43.5℃±0.1℃。相对密度0.9875。折射率1.4342。与八甲基环四硅氧烷性能相似,在微量硅醇钠、硅醇钾或少量浓硫酸作用下,Si-O-Si键断裂重排,生成直链的聚硅氧烷和环状硅氧烷的混合物。  Si-CH=CH2键在有机过氧化物存在下,可进行游离基聚合反应。在铂催化剂存在下,可与Si—H键发生加成反应。可由甲基乙烯基二氯硅烷的水解料催化裂解来制取。用来合成有机硅中间体及高分子化合物提供活性交联点之用,是制备硅橡胶不可缺少的原料之一。

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