These materials are known as "radioisotopes" -versions of an element that, because they have an abnormal number of neutrons, frequently decay and release radiation.
这些物质被称作“放射性同位素”—同一种元素的变种，他们具有异常的中子数量，频繁的衰变和放出辐射。
The human body treats it like potassium, an essential element, and it can penetrate soft tissue and muscle to give off whole-body radiation, he said.
人体将他当成钾（一个重要元素），它可以穿透软组织和肌肉使整个身体受到辐射。
In 2001, the Pentagon declassified one element of this research: the Active Denial System, a weapon that USES electromagnetic radiation to heat skin and create an intense burning sensation.
2001年，美国五角大楼解密了这一研究的一个要点，否认电磁辐射热造成皮肤灼热感或灼烧感的武器。
The singular integration will affect the precision of the result while the Boundary Element Method (BEM) is used in calculating sound radiation.
边界元法应用于计算辐射声场时，由于奇异积分的存在，会影响到计算结果的精度。
They zapped a tiny plastic pellet with 12 laser beams fired simultaneously and allowed some of the resulting radiation to blast a pellet of silicon, a common element in accretion disks.
他们利用12道激光束同时袭击一个小小的塑料球，再利用所形成的部分辐射引爆一个硅球，而硅是吸积盘中的一种常见元素。
In this paper, a method of measuring the input mechanical impedance of the array element (longitudinal vibrating transducer) with square radiation head by using impulse sound tube is proposed.
本文提出了以声脉冲管测量辐射头为方形的一种阵元(纵向振动换能器)的输入力阻抗的方法。
The structure of multiple-aperture radiation element is a closed cavity which cant be processed with normal machining method and have to be disparted to several parts.
多口径辐射单元结构是一个封闭的腔体，采用常规的机械加工方法无法实现，必须将其分解成几个结构件分别加工，再将其连接成腔体。
The results for element input impedance, radiation efficiency of space wave, directivity and radiation pattern are presented.
其结果包括阵列单元的输入阻抗、空间波辐射效率、方向性系数和辐射方向图等。
Balanced micro-strip line is utilized as feed line, printed dipole is adopted as radiation element, and a matching network is employed for tuning the input impedance of the antenna.
该天线采用平衡微带线作馈线，以印刷振子作为辐射单元，末端采用匹配电路对其输入阻抗进行匹配。
The law of characteristic X-rays emitted by target element under the radiation of isotope source in a range of low energy is discussed.
介绍了在低能范围内利用放射性同位素源发出的初级射线，照射和激发靶片元素产生的特征X射线的规律性；
The radiation damping matrix of the infinite element is derived.
推导了辐射无限元的辐射阻尼矩阵。
By taking the rectangular metal patch on a printed circuit board as the radiation element and by cutting a C-shaped slot in the rectangular patch, a frequency band notch is implemented.
该天线采用印刷电路板上的矩形贴片作为辐射单元，通过在矩形贴片上开一个C形槽来实现陷波功能。
A theoretical method to solve acoustical radiation modes and acoustical radiation efficiency of complex structure by a boundary element method and acoustical radiation theory is posed in this paper.
提出一种用边界元方法与声辐射理论求解复杂结构的声辐射模态与声辐射效率的理论方法。
The small-size wide-band antenna (103) further includes a stub conductor (17) as an impedance matching unit for matching the impedance between the radiation element and the power supply means.
小型宽带天线（103）还包括作为在辐射元件和电力供应单元之间进行阻抗匹配的阻抗匹配单元的短截线导体（17）。
Sleeve dipole is chosen as antenna array element, because of its omnidirectional radiation and its configuration as antenna array.
天线单元采用套筒偶极子结构，这种结构既能实现全向辐射特性又易于串联组阵。
The finite element model of underwater structure with shafting is built by ANSYS. The characteristics of structural acoustic radiation are investigated by the direct boundary element method.
使用ANSYS有限元软件建立带有推进轴系的潜艇尾部结构模型，用直接边界元方法进行潜艇尾部结构水下辐射噪声特性分析。
The commercial software SYSNOISE which is based on the boundary element method is used to calculate the acoustic radiated field and radiation impedance of various sources.
研究了利用基于边界元方法的SYSNOISE软件来计算各种声源的声辐射。
PN-junction is the basic element of electron system and the interference of electromagnetic radiation will affect on PN junction finally.
PN结是电子系统的构成基础，电磁辐射干扰将最终作用到PN结上。
An approach to the thermal radiation of absorbing-emitting media, or weak absorbing media, e. g. burned gas, in the finite element analysis (FEA) of heat transfer is studied in this paper.
研究了有限元传热分析中有吸收—发射性介质(或称弱吸收性介质，例如燃气)参与辐射传热时的处理方法。
An effective vector finite element method (FEM) for analysis of 3d radiation problem is proposed.
提出了一种用于3 -D电磁辐射特性分析的快速有限元方法。
In the prediction of sleeper radiation noise, the finite element beam model of sleeper is more suitable.
最终得出在预测轨枕辐射噪声时，轨枕梁有限元模型更加适合。
The detection system (100) also comprises optical means (112) adapted for guiding said excitation radiation aside the at least one detector element (106).
所述检测系统(100)还包括适于将所述激发辐射引导到所述至少一个检测器元件(106)的旁边的光学装置(112)。
If water elevation is used to be the control element, radiation condition can also be applied to water elevation.
如果用水位作为控制条件，也可以使用辐射边条件。
Based on the finite element analysis results of the dynamic properties of the structure, the acoustic radiation of the structure is analysed using the results of the surface velocity distribution.
在用有限元法分析结构动态响应特性的基础上，利用有限元分析得到结构表面振动速度分布，分析表面阻尼处理板结构的声辐射。
On the basis of the experimental element pattern and GTD, an efficient numerical method for analyzing 3-D radiation field of antennas on the truncated cone-cylinder is presented.
根据实测的单元天线方向图，利用几何绕射理论，给出了金属截锥柱侧天线三维辐射场的一种有效的数值分析方法。
The antenna body is disposed in the clearance area, and includes a radiation element and a fixing plate which is made of the printed circuit board material.
而天线本体被设置于该净空区内，该天线本体包括辐射元件和固定板；
The system can further include a pyrometer wavelength blocking filter between the source of laser radiation and the wavelength responsive optical element.
该系统可进一步包括在激光辐射源和波长响应光学元件之间的高温计波长阻挡滤波器。
A finite element method to calculate the temperature field of Concrete Filled Steel Tubular (CFST) members under solar radiation was presented.
提出日照作用下钢管混凝土构件截面温度场的有限元计算方法。
The radiation detection system (100) furthermore comprises at least one detector element (106) for detection of the generated sample radiation.
该辐射检测系统（100）此外还包括至少一个用于检测产生的样本 辐射的检测器元件（106）。
After carrying out a theoretical analysis of vibration and sound radiation of mill cylinder, simulation for acoustic field has been preceded by boundary element method.
本文对球磨机筒体的振动和声辐射进行了理论分析，然后结合边界元方法对筒体辐射声场进行了仿真分析。
应用推荐