查询词典 helium

Although helium is nontoxic and inert, it can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support life.

尽管氦无毒且不活泼，通过取代空气中的氧，使之下降到维持生命所必须的水平以下，它可以成为简单的窒息物。

The hazards associated with helium are asphyxiation and the high pressure of the gas in containers and systems.

同氦相联系的危险是窒息和在容器和系统里的高压。

In fact, the arithmetic is not set up this way, the quality of nuclear helium than two protons and two neutrons, and the quality of fewer 0.0302 atomic mass unit [57]!

实际上，这样的算术并不成立，氦核的质量比2个质子、2个中子质量之和少了0.0302原子质量单位[57]！

Alpha particles have two positive charges and a mass of four atomic mass units; they are identical to helium nuclei.

因为α粒子有两个正电荷，质量为4，射出后产生的子核的正核电荷和原子序数都比母核小两单位，质量小四单位。

The heavy elements in the theory of spontaneous metamorphosis immediate sensation around the world ;(4) is proposed to estimate the Earth's radiation age;(5) from the charge-mass ratio α which is derived helium ions;(6) from the scattering of α Bighorn recognized atomic mass concentrated in a radius of 10-12 meters in the nuclear, on positively charged core surrounded by negatively charged electrons;(7) with natural α-particles from the nitrogen nuclei in the outgoing protons, this is the first time human beings to change the chemical elements of artificial nuclear reactions;(8) predicted that heavy hydrogen and neutron sub-existence .

这一重元素自发蜕变理论立即轰动全世界；（4）提出用放射性估算地球年龄；（5）从α的荷质比得出它是氦离子；（6）从α大角散射认识到原子质量集中在半径为10－12米的核上，核带正电，周围是带负电的电子；（7）用天然α粒子从氮原子核中打出质子，这是人类第一次实现改变化学元素的人工核反应；（8）预言重氢子和中子存在。

The atomic weight of helium is five times more than that of hydrogen.

A 氦的原子重量比氢的原子重量重5倍。

A variatioual calculation of the energy of the-2s2 is state of helium has been carried out with the use of a wave function of the Hylleraasian typo. The wave function is where s,t u are in units of 4 times the first Bohr radius of hydrogen.

本文以变分法计算2s~21~S态氦原子之能量，所用之波函式，即：=e~(-0.2278s){1-0.17079s-0.063155u-0.013869t~2 +0.010044u~2+0.0064785s~2}上式中之s，t，u均以4倍於氢原子之第一Bohr半径为单位。

Had proven according to this theory Urey has discovered the hydrogen isotope deuterium existence, however the Bohr theory's further development encounters the insurmountable difficulty, it is unable to process compared to the hydrogen atom slightly for the complex spot helium atom, also inextricability light spectral line intensity question and non-fetter system's question; The Bohr theory also is only the quantal concept and the classical theory mix, theoretically appears is not very harmonious.

根据此理论证明了尤里发现了氢的同位素氘的存在，然而玻尔理论的进一步发展遇到不可克服的困难，它无法处理比氢原子稍为复杂一点的氦原子，也无法解决光谱线的强度问题和非束缚体系的问题；玻尔理论还只是量子概念和经典理论的混合，理论上显得很不和谐。

The transition plateau, as measured at the HeII cell, is affected by the heat flux flowing along the helium column within the capillary and the depression by heat f...

实验数据表明，通过毛细管的热流对λ转变温度测量值有一定的下压作用，其数值为 10 0 μW下压量为 0 。38mK 。

A Cepheid becomes dimmer as ionized helium builds up in its atmosphere.

当造父变星的大气层中电离氦增多时，它会变暗。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。