半衰期

The rest, there is a fission reaction products 3.4%, 1% is plutonium, a longer half-life of these actinides.

剩余部分中，有3.4%是裂变反应产物，1%是钚这类半衰期较长的锕系元素。

Transcription termination by actinomycin D was used to detect half-life of VDR mRNAin GHS and control rats.

采用放线菌素D转录终止法测定VDR mRNA的半衰期。

The isotope 232Th has a half-life of 14 billion years and decays to 228Ra by emitting an alpha particle, which is called the alpha decay (the blue arrows show the "direction" of decay).

同位素中232Th的半衰期为14亿年和衰变40.2，82.7，32.4，28.9，94.2，69.3，57.1，71.6，64.0，71.4，692发光的一个粒子，即所谓的衰变(蓝色箭头显示的"方向"的衰变)。

Alpha decay half-lives of even-even superheavy element s are calculated in the framework of the effective liquid drop model using the combination of constant asymmetry shape description for the mass transfer and the effective inertia coefficient.

利用有效液滴模型计算了偶偶超重核的α衰变半衰期，计算过程中采用了保持碎片体积守恒的不对称形状描述以及有效惯性系数计算Gamow势垒穿透因子。

Alpha decay commonly occurs in elements with atomic numbers greater than 83, but can occur in some rare-earth elements in the atomic-number range of 60 to 71.

发射α粒子的主要是重于铋(lutetium，原子序数83)和从钕(neodymium，原子序数60)到镏(Iutetium，原子序数71)的稀土元素，α衰变的半衰期，从1微秒(10-6秒)到约1017秒。

In accordance with the principle of chemical dynamics, a new evaluation method for rate of ammonification of urea was established, and the type of reaction of ammonification of urea was confirmed.

根据化学反应动力学原理，建立了尿素氨化速度的评价方法，确定了尿素氨化反应的级数，测定了普通尿素、缓释尿素在特定条件下的氨化反应常数和半衰期，并依此评价了涂层缓释尿素的缓释性能。

"A particularly interesting finding of this study is that the vaccine achieved fairly good control of blood pressure in the early morning hours," said Juerg Nussberger, M.D., Division of Angiology and Hypertension, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland, who presented the study in a Tuesday media briefing.

Juerg Nussberger博士认为与降压药物相比，高血压疫苗具有以下优势：（1）降压药物半衰期短，无法稳定控制清晨血压，而这正是高血压疫苗所擅长的；（2）高血压疫苗只需每四周注射一次，依从性明显好于降压药物；（3）高血压疫苗可有效控制血压，而降压药物只能使四分之一的患者血压得到成功控制。

The aerobic degradation of CDESA was studied,sedimentation sludge in natural environment was used as source of animalcule,and after dilution,cultivation an.

对CDESA的好氧降解性能进行了研究：以天然环境中的生活沉降污泥作为微生物源，用河水稀释，经培养、驯化后用于测试降解时间和半衰期，并与D1821的好氧降解性能作了对比。

This conclusion, combined with the data obtained from the short-lived Hf-W and Sm-N d isotopic systematics, suggests that the Moon was initially accreted at 4.5 Ga, followed by development of the global lunar magma ocean. The primary lunar crust is composed by ferroan anorthosite which was produced by flotation of plagioclase during crystallization of the LMO. However, the mafic minerals, coevally crystallized with the plagioclase, sank to the base of the LMO due to their high density, and made up the main part of the lunar mantle, which served as the source during later mare basaltic magmatism.

根据这一年代资料，结合对月岩样品进行的短半衰期Hf-W与Sm-Nd同位素体系的研究结果，认为月球大致形成于45亿年，其后开始由岩浆海导致的内部核－幔－壳的分异，岩浆结晶的低密度斜长岩构成最初的月壳，而密度大的岩石构成月幔，而此月幔则成为后来月海玄武岩的主要岩浆源区。

Let us finish with Half-Life 2 where we activate anti-aliasing and anisotropic filtering.

让我们完成半衰期2当我们开启反锯齿和各向异性过滤。

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。