查询词典 extinction

In Mexico's Yucatan peninsula have called the Chicxulub crater, and its 6,500 years ago What is the relationship between the extinction of dinosaurs?

在墨西哥的尤卡坦半岛上有一个叫做希克苏鲁伯的陨石坑，它和6500万年前的恐龙灭绝有什么关系？

A structure of the switch is given, which has an ideal extinction ratio and is characterized by its easy alignment and no strict confinement of the length along Z-axis.

介绍了这类开关的一种结构，它有理想的消光比，并具有校准方便，对沿Z轴长度无严格限制等特点。

The extinction of species is concerned with the degree of threat by biotic and abiotic factors.

随着物种的加速绝灭，保护生物多样性受到广泛地关注。

In absorptive PS, light field attenuates rapidly with the increase of depth and extinction coefficient.

在线性吸收的PS中光强随光进入介质的厚度及消光系数的增加迅速衰减。

Secondly, combining with our previous discussion on permanence and global attractivity, we weaken our sufficient conditions for permanence and extinction of the species further, and get better results by now.

利用函数的上、下平均值，我们得到系统持久和全局吸引的充分条件，从而，推广了Ahmad和Lazer的有关结果。

The molar extinction coefficient, maximum absorption wavelength, reaction rate constants of trans-cis photochemical isomerization, thermal back-isomerization and photochemical back-isomerization and equilibrium constant of photochemical back-isomerization reaction of a novel photochromic liquid crystalline dendrimer G1 of the first generation containing nitroazophenyl groups on its periphery and small molecular azophenyl moiety M1 in solution were described.

张其震*1，盛昕1，李爱香1，王艳2摘要：研究了树外围含12个硝基偶氮苯基元新型一代碳硅烷光致变色液晶树枝状大分子G1和基元小分子M1在溶液中的最大吸收波长、摩尔消光系数、反-顺光化学异构化反应速率常数、热回复异构化反应速率常数、光化学回复异构化反应平衡常数及速率常数。

The results show that the introduction of 2-, 3- and 4- substituent of group leads to a bathochromic shift of position of the maximum absorption wavelength λmax, and also increases the molar extinction coefficient εmax.

2位、 3位和4位引入取代基可使酚类化合物的最大吸收波长λmax发生红移，摩尔消光系数εmax明显提高。

The formation of metal complexes causes a large bathochromic shift of the absorption bands and an increase in the molar extinction coefficient compared with the free ligands.

并从一些金属络合物的红外光谱中C(8)=O吸收峰在络合前后的变化，进一步增强了对配位结构的了解。

But if that theory is correct then bdelloid rotifers, freshwater invertebrates that haven't had sex in at least 30 million years, should have been parasited into extinction long ago.

但是如果这个理论是正确的，那么蛭形轮虫（一种淡水无脊椎动物，它已经无性繁殖至少3000万年了）应该在很早以前就被寄生虫消灭了。

But if that theory is correct then bdelloid rotifers, freshwater invertebrates that haven't had sex in at least 30 million years, should have been parasited into extinction long ago.

但是如果这个理论是正确的，那么蛭形轮虫，这种至少已经存活了3千万年的无性繁殖的淡水无脊椎生物，应该早就因为感染寄生虫而灭绝了。

World War II: Battle of Saipan - Americans take Saipan.

1944年的今天，美国在塞班战役中拿下塞班岛。

When the scorner, the rejecter of truth, has become presumptuous; when the routine of work in the various money-making lines is carried on without regard to principle; when the student is eagerly seeking knowledge of everything but his Bible, Christ comes as a thief.{DA 635.3

当讥诮和拒绝真理的人，到了任意妄为时，当追求财利者罔顾按道义经营谋利时，当学人正在兢兢业业地研究各种知识，而单把圣经丢在一边时，基督要像贼一样来临。