查询词典 radiation hazard

Rna - Rns, see "Partitioning of net radiation", for multiple plants the fraction of radiation to each plant is calculated in the radiation section, see "Partitioning of radiation between plants", es is the vapour pressure at saturation, ea is the actual vapour pressure,ρa is air density, cp is the specific heat of air at constant pressure, Lν is the latent heat of vaporisation,Δ is the slope of saturated vapour pressure versus temperature curve,γ is the psychrometer "constant", rs is an "effective" surface resistance and ra is the aerodynamic resistance.

潜在蒸腾量 Etp 根据Monteith(1965)给出的彭曼联合方程形式计算：式中： Rn 为对于蒸腾的有效净辐射量(也就是 Rna - Rns ，见&净辐射划分&-Partitioning of net radiation，对于多重植被，每一株植物的辐射比率的计算见辐射一节的&植物间的辐射划分&Partitioning of radiation between plants)； es 为饱和水气压；ea 为实际水气压；ρa 为空气密度； cp 为常压下的空气比热；Lν为汽化潜热；Δ为与温度曲线饱和水气压关系曲线斜率；γ为干湿球湿度计&常数&；rs 为&有效&表面阻力；ra 为气动阻力。

The scarce annual global solar radiation data of Henan Province were extended to recent 40 years (1960￣1997) by experimental formula, and direct solar radiation and scatting solar radiation data were calculated by another experimental formula for the stations with the only global solar radiation data.

首先把河南省不完整的太阳辐射资料，用经验公式推算到近40年（1960～1997年）的资料。并把只有总日射资料的站，利用经验公式，计算出直接辐射、散射辐射资料。

According to the formulae on radiation and radiation resistance in antenna theories, the radiation characteristics are illustrated that the radiation of under considered can be neglected.

运用小波矩量法求出导线中的电流分布，进而给出两个尺寸不同的圆形电感在平面入射波作用下的辐射方向图，并进行分析比较。

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)。

Results The major occupational hazard factor was dust, physical factors, chemicals and medical radiation. The workers exposed to occupational hazard factors accounted for 35.37% in all workers, which mostly in metals, light industry, building materials, chemicals, machinery, textile, coal and medical institutions.

结果 2007年广西职业病危害因素的种类主要是粉尘、物理因素、化学物质因素、医用辐射；职业病危害因素的接触人数占其职工总人数中的35.37%，主要分布在金属、轻工、建材、化工、机械、纺织、煤炭、医疗机构等8类行业。

The United Kingdom has pledged to provide technical assistance to the peacekeeping effort in Darfur, including airlifting supplies and equipment to assist the African peacekeepers.

英国承诺为达佛的維和努力提供技术帮助，包括提供非洲的維和部队空运补給和裝备。

Results: The level of ET-1mRNA in placental villus was significantly higher in pre-eclamptic women than that in control group.

结果：妊高征组患者胎盘绒毛组织ET-1 mRNA的表达较正常妊娠组明显增高。