查询词典 cosmogenic

But the study that the cosmogenic 7Be is imbibed and intercepted by the cover materials on the soil surface is relatively less, which leads to a direct impact on the accuracy of the tracing results, the establishment and application of the tracing models.

：7Be具有环境微粒示踪价值，在示踪土壤侵蚀研究中有一定的应用，但是有关地被覆盖物对7Be截留吸收的研究目前还相当少，这直接影响了示踪结果的准确性、示踪模型的建立及应用。

This paper illustrates the potential of cosmogenic neon exposure age in studying the eruption., surface morphology, and erosion history of young volcanic rocks, which are difficult to date using other conventional methods,such as K-Ar or 40Ar/39Ar dating.

本论文阐述了宇宙中氖的暴露时间在火山爆发，表面形态和新形成的火山岩的侵蚀过程研究中的潜力。这些研究用常规的方法，如钾-氩或40氩/39氩测定年代较难进行。

The concentrations of cosmogenic nuclides ~(10)Be and ~(26)Al recorded the messages of exposure time and denudation rate on the denuded surface.

宇宙成因核素10 Be和2 6Al的浓度记录着岩层剥蚀面的暴露时间和岩石剥蚀速率等信息。

These subtle signals of deformation, when combined with the ability to measure the age of the disfigured landscapes (using cosmogenic nuclides that bombard the Earth from all corners of the universe), produced surprising results.

这些敏感、微妙的畸形变化信号，在结合测量呈现山水地貌毁损变形的年代能力（采用来自宇宙各个角落的轰击地球的宇宙进化论的核心要素）时，就会产生出令人惊讶的结果。

Accelerator mass spectrometry has ultra-high sensitivity and can be used to detect extremely low impurity contents in samples. 10Be is a cosmogenic nuclide. As a tracker, it has been widely applied to earth, environmental and cosmographic sciences.

加速器质谱计具有很高的灵敏度，能测量样品中含量极微的杂质同位素。10Be是一种宇宙成因核，在地学、环境科学和宇宙学等领域有广泛的应用，它为纯β衰变核，端点能量低且半衰期很长。

Thiscontributes greatly to t he uncertainty of the research result, and limits the use of cosmogenic nuclides in theresearch on soil and weathering profile.

简要介绍了土壤和风化壳剖面中宇成核素的收支情况和累积，并通过几个实例介绍了国外和境外一些土壤和风化壳的宇成核素研究情况：土壤和风化壳的年龄和表面侵蚀速率，坡地土壤的生成速率和蠕滑速率，土壤面的地貌演化过程，以及一些土壤侵蚀事件研究。

The Apatite fission track analysis, the deposition erosion process analysis and the cosmogenic nuclide analysis are introduced as the three new advancing methods on the recovery of the thickness of eroded strata in basin in this paper.

主要介绍了磷灰石裂变径迹分析法、沉积波动过程分析法和宇宙成因核素分析法等3 种恢复和计算地层剥蚀量的新方法。

Ca is widely abundant in nature and its rodioisotope 41 Ca is a cosmogenic nuclide with a half\|life of 10 5 years. However, the 41 Ca/ 40 Ca ratio in natural samples is very low and can only be measure d by accelerator mass spectrometry. The application of 41 Ca is ve ry i mportant not only in the life science but also in geological dating, global envi ronment change studies and astrophysics.

1 引言Ca在自然界中广泛存在，它不仅是人体中含量最丰富的元素之一[1] ，也是众多其他物质的组成部分。41Ca(半衰期为 1.0 3× 10 5a)属于Ca的放射性同位素中的一种，其衰变方式为轨道电子俘获，只发射3.3keV的X射线，天然样品中41Ca 40 Ca的值很小。

Without anthropogenic radioactivity, the initial 129I abundance of surface reservoir of earth is confirmed as 1.5×10^(-12) that can be used as starting value for calculation of cosmogenic 129I dating.

核试验和核事故释放的129I测定的是现代沉积物年代，测年时间尺度为50a。人们提出人类利用原子能之前地球表层初始129I丰度为1.5×10^(-12)，并以该值作为利用宇生129I估算年代的初始丰度值。

In this paper, the cosmogenic 7Be content of different cover materials on the soil surface was analyzed, the results showed that the withered plant cover contained the highest 7Be activity among the incomplete decomposed and the living plant cover in the end of springtime.

本文对不同地被物中的7Be含量进行了分析，结果表明：春季末地表不同地被覆盖物中干枯植物的7Be含量最大，半分解物次之，活植物中含量最少。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。