查询词典 variable

random variable ; law of large number ; central limit theorem ; Mathematica

鉴于随机模拟过程的易操作性，笔者只对大量独立同分布的随机变量进行验证，即只讨论

Most of them rely on the central limit theorem, that states that the mean of N independent realizations of a random variable with mean u and variance d^2 approaches a normal distribution with mean u and variance d^2/N .

在蒙特卡罗评估框架内大量的各种选择性算法已经被推出，他们中的大部分依赖于中心极限定理，一个均值为U方差为D^2的随机变量的N次独立实现的平均值接近于一个均值为U方差为D^2/N的正态分布。

They discovered almost 800 Cepheid variable stars,a special class of pulsating star used for accurate distance measurement.

他们发现了差不多800个造父变星，一种用于准确测量距离的特殊变星。

Hisfirst great discovery was made when he recognized a Cepheid variable star.

他的第一个伟大的发现是他观察到了可变恒星"瑟福尔的"。

John Learned at the University of Hawaii in Honolulu and his colleagues think that signals could be sent by manipulating Cepheid variable stars.

位于火瑙鲁鲁的夏威夷大学的John Learned和他的同事们认为信号可以通过操纵造父变星来传递。

His first great discovery was made when he recognized a Cepheid variable star.

他识别出造父变星，做出了第一个重大发现，在仙女座星云的外围区域。

Of the great nebula called Andromeda. Cepheid variable stars are stars whose brightness changes at

被称为瑟福尔的可变恒星的亮度都是在一个很有规律的时段里改变。

This view of NGC 3370 was obtained by the Hubble Space Telescope using the Advanced Camera for surveys and is sharp enough to identify individual Cepheid variable stars in the galaxy.

星系NGC 3370的中心分布着轮廓鲜明的尘埃带和一个不太容易辨认的核。

Cepheid variable stars are used to establish extragalactic distances.

这张清晰度非常高的图片是哈勃太空望远镜利用高级测量摄像机拍摄，我们通过它甚至能看到该星系里的单个造父变星。

Astronomers made observations of Cepheid variable stars— pulsating stars used to measure vast distances— in the Virgo and other clusters to establish the expansion rate and the universe's age.

天文学家用哈勃观测到仙女星座和其它星群中的造父变星以确定宇宙的膨胀速度和宇宙的年龄。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。