核素

Abstracts: To sample high speed random signals without drop, a design of O-shaped high speed random signals acquisition card based on the CPLD and its realization are presented. It consists of same three sets of acquisitive circuits, which construct O-shaped structure to sample the signals without drop .And it adopts threshold judging method to determine the valid data in the process of the acquisition, abandons vast of the redundant useless data at the same time, it only sends the useful data to the host computer by the way of DMA, so it is easy to processing the data. The design is concise and reliable. The sketch map of the logic circuit and the explanation of the main parts are presented. This design has been applied in the engineering project of sampling α nuclide.

为了对随机到来的信号进行不丢失的高速采集，提出了一种基于CPLD的随机信号环形高速采集卡的设计与实现；通过采用三套采集电路形成一个环形结构，可以对随机到来的信号进行不遗漏的高速采集，而且在采集过程中利用阈值的方法鉴别出有用信号，并舍弃了大量的冗余无用数据，从而只将有用数据以DMA的方式传于主机，便于进行信号的处理；电路设计简洁可靠，并给出了主要的逻辑电路示意图与主要部件说明；该系统已经应用在采集α核素的工程实践中。

In practical study, the essential flow is""on the basis of the study of the faults, strata denuded thickness and original thickness, analyzing the controlling effect of the faults to the sedimentation and denudation, and combined with the areal geology background, reconstructing the basin prototype of each stage"". 2. As the basic theories and methods of the calculation of the denuded thickness, such as, the methods of cosmogenic nuclides, wave equation, apatite fission track, structural sections, acoustic wave, vitrinite reflection, etc, were argued detailedly , and their applicable ranges were analyzed , the denuded strata thickness of each structural layer layer of pre-Tertiary was reconstructed.

对宇宙成因核素法、波动方程法、裂变径迹分析法、构造横剖面法、声波时差法、镜质体反射率法等计算剥蚀量方法的基本原理进行充分论证、改进，分析了各方法的适用范围，在此基础上，综合充分运用上述方法，计算了济阳坳陷前第三系各构造层在不同时期的剥蚀量，绘制了中生代时期古生界顶面的地层剥蚀量等值线图、新生代时期古生界顶面的地层剥蚀量等值线图、白垩纪沉积时侏罗系剥蚀等值线图、新生代沉积期白垩系剥蚀等值线图、新生代沉积期侏罗系剥蚀等值线图等图件，并通过对古生界地层的热变质程度分析，确定了有1500～2000m的早、中三叠世的原始沉积地层在晚三叠世被剥蚀殆尽。3。

Radionuclide imaging: In graft side, there were obvious uptakes of the ^99mTc-MDP and revascularization; In control side, there was no process of bone regeneration and bone metabolism.

放射性核素显像：实验侧有较明显的核浓聚和再生血管化现象，对照侧无骨重建，故无骨代谢变化。

Zirconolite-rich synroc is ideal solidification material for solidifying high level radioactive waste .

富钙钛锆石型人造岩石将放射性核素固定在其晶格中作为晶体的一部分固定起来，大大提高了放射性废物处置的长期安全性，是固化高放射性废物理想的固化介质。

Radioactive nuclides are solidified at crystal lattice as one part of crystalloid by zirconolite-rich synroc, which greatly enhances the long-term safety of radioactive waste disposing.

富钙钛锆石型人造岩石将放射性核素固定在其晶格中作为晶体的一部分固定起来，大大提高了放射性废物处置的长期安全性，是固化高放射性废物理想的固化介质。

The radionuclides that passed thro ugh the aerated zone and entered the aquifer will exist in spring, stream and sea. B as ed on this,the intake dose by residents in different age groups resulting from d rinking contaminated spring water and eating seafood is calculated.

穿过包气带进入含水层中的核素将在泉水或地表水体中出露，据此计算居民饮用含污染物的泉水或海产品所致的各年龄组的剂量。

Thesis studied adsorptive equilibrium time and adsorption capacity of NF on simulated nuclide strontium in a few conditions including temperature,pH value,concentration and medium with the intermittence method and offered some references for valued mid-lower radwaste disposition.

本文采用间歇法来研究沸石在不同环境条件下(浓度、温度、pH、介质)对模拟核素Sr2+的吸附性能及其平衡吸附时间，为评价中低放核废物处置效果提供一些参考依据。

This is because radioactive nuclear elements are formed in the giant outbursts of energy, and some of these decay by releasing positrons.

这是因为放射性核素在这巨大的爆炸能量中形成，其中一些放射出正电子而衰变。

Exposure ages of bedrock samples taken from two nunataks in the Grove Mountains, interior East Antarctica, are studied by dating in situ produced cosmogenic 10Be and 26Al. The results indicate that the minimum exposure time of the five samples are all about 2Ma, much older than that of Last Glacial Maximum.

采自东南极内陆格罗夫山地区两个冰原岛峰的五个基岩样品的原地生成宇宙成因核素1 0 Be和2 6Al测试结果表明，这五个样品的最小暴露年龄都在 2Ma左右，远远早于末次冰期极盛期。

The migration of radioactive nuclides in groundwater is the one of most important problems in environmental geosc...

放射性核素在地下水中迁移的研究是当前环境地球科学的一个热点课题。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。