Positron emission tomography ( pet ) is a non - invasive method to detect the distribution of radionuclide in vivo 正电子发射体层摄影术是一种无创性的探测生理性放射性核素在机体内分布的断层显像技术。
Radiation protection instrumentation ; installed personnel surface contamination monitoring assemblies ; low energy x and gamma emitters 辐射保护仪表.人员躯体表面污染监测装配组件.低能x和射线发射体
The approximative solution of differential kinematics equation containing a cubic veloccity nonlinear term for a projectile in the northern hemisphere 含速度三次方非线性阻力项的北半球发射体运动微分方程的逼近解
Rect - the area light emitter has a rectangular shape . the dimension of the emitter is set through two numeric buttons : sizex and sizey 矩形区域灯光发射体呈矩形。发射体的维度通过两个数字按钮设置：尺寸x和尺寸y 。
Lenses in protective eyewear should be made of polycarbonate , which can withstand impact from a ball or other projectile traveling at up to 90 miles an hour 护目镜的镜片必须是聚碳酸酯材料的。这种材料可以抵抗每小时90英里的球或者其他发射体。
And it turns out a good emitter is also a good absorber , so in the sense of absorbing light rather than reflecting it the sun could actually be called very dark 一个好的发射体也是一个好的吸收体，从吸收而不是反射光的角度来看，太阳确实可以称得上很黑。
At present , the material of emitting cathode is mostly present with big escaping powers low reliability 1ow uniformity and emission capability 摘要目前，阴极发射体材料多存在逸出功大，可靠性及均匀性低，发射性能低、不能自动调节活性物质更替的速度等方面的问题。
The wireless technology , called radio frequency identification ( rfid ) , has been used in thousands of stores for tracking inventory and in identification chips implanted in some pets 这种无线技术称为无线电频率识别（ rfid ) ，曾在成千的存储器运用追踪以及在正电子发射体层摄影的鉴定植入芯片中鉴定识别。
1 . advanced technique relying on precise production program , scientific proportioning and contemporary hi - tech compounding art , full - cotton far infrared functional textile product is made as far infrared emitters embed the full - cotton textile evenly 它以科学的配比严格程序，采用当代高新复合技术将远红外发射体均匀地渗透在纯棉织物上，制成纯棉远红外功能织物。
The whole performance of device depends on the capability of field emitting cold cathodes which act as the kernel of all kinds of vacuum micro - electronics device . people take much measure constantly to improve the whole performance of device through mending the cathode structure and optimizing cathode preparation methods . among them , finding new material of emitting cathode is a central way to enhance the performance which be given a favorable condition offered by development of science and researching of new material 人们通过不断的改进阴极结构,优化阴极的制备工艺等各种措施和手段来提高阴极的总体性能,其中,新材料在阴极发射体中的运用是提高阴极性能的主要途径之一,近代科学技术的高速发展以及对新材料的进一步开发和研究为场发射阴极性能的改善提供了广阔的发展空间和开发潜力。
