查询词典 gammar radiation

IMRT is a new technology that is different from CRT. It uses multiple radiation beams that are broken up into many smaller beamlets. This allows radiation oncologists to precisely target the radiation to the tumor and spare the adjacent normal structures from high doses of radiation.

调强适形放疗是一种新型技术，它使用已经被分成众多细小光束的放射线，这可使放疗医生精确地确定肿瘤位置而临近正常组织不受到照射。

This invention relates to a circular small UHF antenna with high dielectric constant and its processing method, among which, the UHF antenna characterizes that 1,it is composed of a radiation plate, a feed point and a medium chip, 2, the radiation plate is closely adhered to the top surface of the medium chip, the bottom surface is the metal ground face, the chip and the radiation plate is rectangle or square, 3, the feed point is at the 1/3 place of the diagonal line of the rectangular or square radiation plate apart from the top point.

本发明涉及一种高介电常数圆极化小型超高频天线及其制作方法。UHF天线特征在于(1)所述的超高频天线是由辐射贴片、馈电点和介质基片组成；(2)辐射贴片紧贴在介质基片的上表面，介质基片的下表面为金属接地面；介质基片和辐射贴片呈矩形或正方形；(3)馈电点位于矩形或正方形的辐射贴片的对角线离顶点的1/3处。其制作方法是采用ε≥38高均匀性陶瓷基片，再结合丝网印刷技术完成厚膜焙银后形成辐射贴片，然后再圆极化。具有制作工艺成熟、体积小及使用灵活等特点。

Ionizing radiation ; natural radiation ; man\|m ade environmental radiation ; public ; environment ; radiation protection

北京大学物理学院技术物理系；物理， Physics ，编辑部邮箱 2003年 09期电离辐射；天然辐射；人工辐射；公众；环境；辐射防护

Methods NCI - H446 lung cancer cell strains were divided into 5 groups:control simple radiation, lipofectin plus radiation, nonsense sqnence radiation and ASOI）N plus radiation.

方法NCI—H446肺癌细胞株分5组，分别为空白对照、单纯照射组、脂质体加照射组、无义序列加照射组、反义寡核苷酸加照射组。

Using linear accelerator,the dose rate of the 6MV X-ray was 2Gy/min.The A549 spheroids was not more sensitive to low doses of single radiation.After exposure to 2-8Gy radiation,the spheroids recured quickly.Thetreatment of fractional radiation were more effective than single ones.With the increase of radiation doses,the 〓-M% block increased,numberof dead and apoptosis cells increased.

直线加速器产生的6MV高能X射线，2Gy／min的剂量率照射，A549多细胞球体对低剂量单次放疗不太敏感，2-8Gy范围内低剂量放疗后球体细胞很快增殖复发，分割放疗疗效优于单次放疗。

The log10 of survivors from radiation is plotted against the radiation dosage, and the radiation D or D10, which is comparable with the thermal D value, is obtained. The D10 is defined as the amount of radiation in rads (ergs of energy per 100g of material) required reducing the microbial population by 1 log (90%).

若将照射中存活微生物数目的log10值对照射剂量进行标绘，则可求出辐照D值(即D10值)，此值与热力D值相当。D10值的意义是微生物总数减少一个对数周期(90％)所必需的照射拉德数(每100克物质得到的能量尔格数)。

According to Rayleigh-Jeans law,the emission of the object is directly linear to its absolute temperature.As the frequency of object increases,Rayleigh-Jeans Law deviates from Planck's Blackbody Radiation Law,and the radiation of object received should be calculated according to Planck's Blackbody Radiation Law.

由 Rayleigh-Jeans公式计算的物体的辐射功率与其物理温度成线性关系，但是随着物体频率的升高，Rayleigh-Jeans公式与Planck定律的近似误差越来越大，此时应根据Planck定律计算物体的辐射功率。

Shadow effect can not be neglected for thermal analysis of spacecraft,Accroding to the angle between solar light and antenna orbit plane and its orbit location,analytical geometry method was used for accurately calculating solar radiation heat flux distribution of reflector surfaces.To analyze the temperature field under heat flux,the formulations of net radiation flux density between two gray elements and the net flux density of gray surface under external thermal flux were deduced.Based on the characteristic of space environment,the nonlinear temperature distribution in transverse direction of reflector shell self radiation were considered,the finite element formulations were given for orthogonal material layered shell by Galerkin method.A layered element including a inner heat source layer was proposed,and the finite element formulation expressed by DOF of the inner heat source layer were put forward with temperature and heat flux boundarys between adjacent layer.

单馈反射面赋形天线是未来星载天线发展的一个重要形式，分析了基于物理光学、几何光学和几何绕射理论的理想反射面辐射场；介绍了基于几何光学的反射面天线赋形方法；针对赋形过程中辐射场的快速分析要求，比较分析了基于物理光学的Fourier-Bessel和Jacobi-Bessel级数展开方法以及GB展开分析方法；利用GB展开快速分析方法在20GHz频率下对0.6m口径的天线进行赋形分析，实现中国大陆的30dB增益覆盖，通过数值计算研究了固定增益期望下的口径尺寸随频率的变化，以及频率为20GHz的不同尺寸天线赋形后的覆盖目标区域最大增益的变化情况。

The actual object heat radiation model is established after comparing the actual object heat radiation to the ideal black body radiation.

文中对辐射测温原理，传感头材料，单波段检测技术及检测波长选择做了理论分析。

The MRI signs of brain radiation injury include: definite history of brain radiation therapy, neurologic symptoms emerged after certain period of treatment, the location of lesion coincided with the radiation field, mainly located in white matter, with edema and mass effect, consistent with the MRS result, no dyscrasia.

放射性脑损伤MRI特点：有明确放疗史，神经系统症状於放疗后一定时期出现，定位与放射野吻合，多位於白质；无恶液质表现；有水肿及占位效应，MRS分析结果符合。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。