氦

At the end of the process a carbon core of the star will be surrounded by a shell where helium is still being fused into carbon, which in turn is surrounded by and envelope where hydrogen is converted into helium.

该过程结束时碳的星核会被一层仍然在进行氦聚变为碳的壳层包围，而在这个氦-碳聚变层的外面还包围着一层由氢-氦聚变层。

Along with many new materials and techniques,helium abstraction technologies from natural gas have been innovated like the adsorption and membrane osmose process have developed fast and coproduction and combined technologies have a good application prospect, which provide new thoughts for the development of helium abstraction technologies from natural gas.

随着新材料、新技术的发展，天然气提氦技术不断改进创新，吸附法、膜渗透法等提氦工艺发展迅速，联产法、联合法工艺有着良好的应用前景，这些都为促进天然气提氦技术的发展提供了新的思路。

Through analysis on the present technologies, this study discovered that low-temperature condensation is a relatively matured method with high cost and highly-consumed energy; the other methods like adsorption, absorption and membrane osmose process are differently characterized by many features hut have not been applied in industrial use for many reasons, Along with many new materials and techniques, helium abstraction technologies from natural gas have been innovated like the adsorption arid membrane osmose process have developed fast and co-production and combined technologies have a good application prospect, which provide new thoughts for the development of helium abstraction technologies from natural gas.

通过对目前提氦技术的分析介绍，低温冷凝法较为成熟，但能耗、成本较高；吸附法、吸收法和膜渗透法等其他提氦技术各其特点，但目前限于适用条件尚不能规模化工业应用，随着新材料、新技术的发展，天然气提氦技术不断改进创新，吸附法、膜渗透法等提氦工艺发展迅速，联产法、联合法工艺有着良好的应用前景，这些都为促进天然气提氦技术的发展提供了新的思路。

scatheless measurement ; numerical simulation ; helium pressure

利用氦气在不同压力下具有不同的状态参数和热力参数，可以通过传热方法测量包壳内的氦气压力。1试验装置和研究方法如图1，把燃料棒浸入到一个高温的池子内，热量会在燃料棒内传递开来，通过测量管壁外面不同位置出的壁面温度，就可以推测到包壳内的氦气压力

To compare the effect of helium-oxygen mixtures containing 80%helium or 60%helium on vital capacity and related index.

比较含80%氦和含60%氦的氦氧混合气体对肺活量及其相关指标的影响。

Superfluid helium is an excellent coolant for infrared detectors which need temperature down to K. HeII phase separator is a crucial part of an infrared cryogenic system at zero-gravity. By using the fountain effect, it keeps the liquid phase separated from the vapor phase.

外太空科学探测系统需要4K以下制冷系统的支持，超流氦是在此温度区间的一种理想冷却剂，超流氦空间制冷系统的关键部件超流氦相分离器是利用超流氦的超流特性和热机械效应实现气液相分离的。

The effects of interatomic potentials on the action of helium in α- Fe are investigated by using molecular dynamics simulations.

采用分子动力学方法研究了不同相互作用势对氦在α-Fe中行为的模拟结果的影响，发现不同的作用势会影响到单个氦原子在α-Fe中的稳定位置，但对氦泡中氦原子的分布无实质性影响。

We use the methods of Rayleigh-Ritz variational and multiconfiguration-interaction to study the excited states of the lithium isoelectronic.

中文摘要：本文采用多组态相互作用方法和Rayleigh-Ritz变分法，以类锂等电子系列为研究对象，重点研究了(Z=2)He-的亲和能和束缚能，氦负离子是最简单的类锂离子，我们首先计算了氦负离子1s2s2p~4Po的能量，然后又计算了氦原子1s2s~3S的能量，由此可以得到氦负离子的亲和能。

To master the liquid helium transfer method correctly is of a great important sig-nificance in economy for reduction of the liquid helium precool amount, full use of the liquidhelium cool amount and increase of the transfer efficiency of liquid helium In this paper the construction and use demands of the liquid helium transfer tubes,liquidhelium precool and transfer methods are presented.

正确掌握液氦输送方法，对减少液氦预冷量、充分利用氦气冷量和提高液氦输送效率有着十分重要的经济意义。

Therefore,it is essential for the researchers to study and develop advanced helium gas abstraction technology from natural gas in order to make sure the costeffectiveness of production and to gurantee national helium supplies for many industries.

因此，在保护有限氦气资源的同时，研究开发先进的天然气提氦技术对于提高氦气生产的经济性、保障国家用氦安全和促进我国天然气提氦工业的发展具有重要意义。

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。