查询词典 radon

The effect of Radon in air on human health has been paid wide attention. The measurement and control of radon involves many different subjects, however, to measure Radon precisely is the precondition to make defense measures.

空气中氡对人体健康的影响已经引起广泛关注，对氡的测量和控制是多个学科共同关心的问题，然而，准确测量氡是采取防护措施的前提。

Some conclusions are drawn:instrument of the digital measure of radon must be standardized and only standardized by flow through radon gas source;gas flux of entering the scintillation chamber should be controlled or measured in the process of digital measure of radon.

指出对测氡仪器必须进行标定，而且必须用流通式氡气源来标定；在观测中应控制或测定进入闪烁室的气体流量。

This paper consults the key technology in the radon measurement device in the national and international and we thinks over the characteristic of α-ray which emit by radon and its daughter, so that decides to use the α-ray spectrum to measure radon.

论文从测量氡及其子体放射出的α射线入手，瞄准国内外测氡装置关键技术发展趋势，结合氡及其子体α能谱测量特点，采用α能谱测氡的途径来完成这一工作。

The radon concentration rises with depth which may be distorted by radon daughters and thoron .(2). Seasonal temperature influence free radon of soil only.

季节温度仅对壤中活动氡运移有影响，对束缚氡影响小；认为温度梯度也是引起空气中氡浓度日变的一个因素；（3）。

Six field measurement sections with dozens kilometers were performed with a real-time radon gauge and a air radon gauge , financed by Chinese Geological Survey. The results show that the Radon concentration is 6.7 Bq/L in field soil and 16.7 Bq/m3 in the air .

在中国地质调查局&四川成都经济区域城市生态地球化学评价&项目的成都市地空界面氡浓度的调查与评价实践中，进行了大量的实验和野外测量，结果表明成都市原野壤中氡浓度水平平均值为6.7Bq/L，空气中平均氡浓度为16.7 Bq/m~3，土壤中氡浓度整体是西部和东部偏高。

Male Wistar rats were exposed daily to radon at a concentration of 100,000 Bq/m(3) for 16 h, and then exposed to 20% cigarette smoke for 1 h for a period of 75 d, with the radon cumulative dose reaching 200 WLM.

雄性Wistar大鼠每日暴露在浓度为100，000Bq/m(3)的氡中16小时，然后暴露在20％的香烟烟雾中1小时，为期75天，氡累积剂量达到200WLM。

According to the theory of flow diffusion and convection, three-dimensional state equation of radon field is established for constant and variable diffusion coefficient and convection rate. The numerical solutions for different coefficient and different boundary conditions are obtained for two models of radon field which have respectively source in the side and inside of collapse column.

根据流体场的扩散理论和对流理论，建立了扩散系数与对流速度为常量或变量情况下的氡气场三维状态方程；对於陷落柱柱体侧面有源氡气场和柱体体内有源氡气场两种理论模型，给出了不同系数和边界条件下的数值解的形式。

The information Radon coefficient wrap-around of the line on a finite field was caused by the modular arithmetic so that the Radon coefficient information in the periodic oscillations direction was processed with discrete cosine transformation, and other direction information was processed with wavelet analysis in order to reduce the wrap-around of rebuilding information. At the same time, according to the characteristic of the noise, one kind of denoising threshold selection plan was proposed.

正交有限脊波分析处理信息时，有限域平面上的直线由于模运算的存在而引起信息Radon系数的卷绕，为此，对Radon系数周期振荡方向的信息采用离散余弦变换处理，其他方向信息采用小波分析处理，以减少卷绕对信息重建影响；同时，结合图像信息中噪声的特点，提出了一种去噪浮动阈值的选取方案。

On the basis of the definition of the extraordinary Radon transform, the theory of rebuilding image from extraordinary Radon transform result is proposed, and some category such as image structure notation, topology of image structure notation and topological space, homeomorphism in topological space, equivalence of homeomorphism relation, topological constant of image structure notation.

与现有的基于区域内部或外形变换的形状分析方法相比，在理论方法上本质不同的是，本文提出的广义Radon变换，直接将原始的图象数据影射到特征空间，给出图象构图特征的描述，给出了可以用来进行图象检索或图象识别的结构特征谱。

Can form plenty of graphic images on Golden/ Slivery paperboard、 PET、 radon velum, it can have the effects like refraction veins, frosting veins, ice crystal, partial flower pattern, radon veins, three-dimensional cartoon.therfor it is a best choice for top-grade wine cases、drug and cosmetic package 、wall calendar、advertising poster、 gift etc.

折光压纹机属于无油墨，环保型的包装设备，能在金银卡纸、PET、镭射膜等包装产品上形成折光纹、磨砂纹、冰花、局部花纹、镭射纹、三维动画等效果，最适用于高档酒盒、药品、化妆品等包装及年画、挂历、广告宣传画等工艺品印刷，是当今包装印刷业的好帮手。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。