unstable element

Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.

每个元素至少有一个同位素不稳定原子核可以进行放射性衰变.

In that case we introduced an unstable super heavy element into their sun's nuclear reaction.

我们再在太阳核子反应中传入了大量不稳定的因素。

Numerical calculation of mode-fields of the spherical plano-convex unstable resonator with Gaussian reflectivity mirror by means of the finite element method

高斯镜平凸非稳腔本征模场的有限元数值计算

Once the internal failure of any structural element, may lead to unstable operation of equipment, or even the possibility of paralysis of the entire device. This will not only cause huge economic losses, severe personal safety will be endangered.

一旦其内部任何组成部分出现故障，都有可能导致整个系统运行不稳定，甚至系统瘫痪的可能性，这不仅会造成巨大的经济损失，严重时还会危及到人身安全。

High tune-pattern in Nanxi Opera Edition of Tai Ping Chun: Its Discovery and Outline; Numerical calculation of mode-fields of the spherical plano-convex unstable resonator with Gaussian reflectivity mirror by means of the finite element method

南戏高腔本《太平春》的发现及其概貌高斯镜平凸非稳腔本征模场的有限元数值计算