asteroid是什么意思

网络释义

用法例句

Microstructure and glass transition temperature of star-shaped styrene-isoprene-butadiene copolymer prepared with N-multi-Li initiator;

氮官能化多锂引发合成星形苯乙烯-异戊二烯-丁二烯共聚物的微观结构和玻璃化转变温度

The results show that the products were star-shaped dendritic PbS single crystals in cubic phase, and the six arms of the star extended along the six <100> directions.

在CTAB(十六烷基三甲基溴化铵)的辅助下,以醋酸铅和硫代乙酰胺为原料,在80℃的水热条件下反应5h制备了星形树枝状的硫化铅纳米晶,并用XRD、TEM、SAED、SEM对产物进行了表征。

Star-shaped polylactide was synthesized by means of melt polycondensation,with L-lactic acid (LLA) as raw material,pentaerythritol (PET) as branched agent,SnCl_2 and p-toluenesulfonic acid (TSA) as catalysts.

以L-乳酸为原料,季戊四醇为支化剂,使用氯化亚锡和对甲苯磺酸复合催化剂,采用熔融缩聚法合成了星形支化聚乳酸。

Star and Dendritic Ferrocenyl Poly (metallocenes);

星形和树枝状二茂铁基聚合物

is article presents the equivalent replacement formulas for solving complicated ventilation network by introducing the equivalent replacement principle of delta-star connection in complex circuits to the study of mine complicated ventilation network and has been applied successfully.

把复杂电路中三角形与星形联接等效变换原理引入矿井复杂通风网络的研究,导出解复杂风网的等效变换公式,并运用成功。

The article discusses the synthetic method of star-like and Amphiphilic Star Copolymers separately.

作为一种特殊结构的非线形聚合物,星形和星形杂臂共聚物具有其特殊的性能,对星形和星形杂臂共聚物的合成分别作做了较详细的论述。

Our main result is: There exists a universal constant d_0>0 such that, for anygiven Fuchaian group Γ,suppose that there exists a hyperbolic disk in Δ of radius whichis precisely invariant under the trivial subgroup{1} of Γ, then T(Γ)is not starlike.

对于任一保持单位圆盘Δ及其外部Δ的Ｆｕｃｈｓ群Γ，利用Ｂｅｒｓ嵌入，Ｔｅｉｃｈｍｕｌｌｅｒ空间Ｔ（Γ）可看成是Δ上Γ的有界全纯二次微分Ｂ（Δ，Γ）中的一个有界区域，本文的目的是讨论Ｔｅｉｃｈｍｕｌｌｅｒ空间Ｔ（Γ）的星形问题。

Study of starlike inner race no-flash die forging technology of automobile constant velocity universal joint;

轿车等速万向节星形套闭塞模锻成形技术研究

The experimental studies on the closed die cold forging of the starlike inner race are carried out,the reasons why the residual stress distributed nonuniformly are analyzed and the methods to improve the cold forging die are suggested.

对星形套闭塞冷锻成形进行了实验研究 ,分析了残余应力分布不均的原因 ,提出了改进冷锻模的方法 ,同时对材料的组织及硬度变化进行了分析 ,研究了位错密度的分布 ,并用位错理论说明了材料硬化的微观原因。