查询词典 ionizing radiation

According to the studied results at present, the studied objects are mainly thin plate and beam about sound radiation mode, a method computed sound radiation mode of complex structure is presented in this dissertation, according to the results of the previous two chapter, a theoretical method to solve acoustical radiation mode and acoustical radiation efficiency of complex structure by boundary element method and acoustical radiation theory is posed, the acoustical radiation power is expressed as a Hermitian quadratic form, while the radiation modes is determined by general eigenvalue decomposing, and then the radiation efficiency is computed via the orthodoxy of radiation modes with regard to impedance matrix and average velocity matrix; lastly, the validity of the method is proved by pulsating sphere and radiating cube with analytical results. According to results of the form three chapter, the structure sound radiation sensitivity is studied in detail, the sound radiation power of structure can be expressed as positive Hermitian quadratic form, the sound radiation sensitivity can be expressed as two parts by partial differential with respect to design variable, which are sensitivity of boundary velocity and impedance matrix, combined with the theory of FEM and BEM, the structure sound radiation can be translated to the analysis of structure dynamic sensitivity and impedance matrix sensitivity. The theory posted in this dissertation is tested by the FEM software ANSYS and the software AAS programmed by author.

在前几章的基础上，通过结构声辐射的模态理论对结构的声辐射的机理进行了深入地探讨，针对目前声辐射模态的研究对象主要是简单的板和梁类结构，提出了一种计算复杂结构声辐射模态的方法，利用前两章研究所得的结论，将边界元方法与广义特征值的理论结合起来研究了复杂结构的声辐射模态与声辐射效率，先将结构的声辐射功率表示为一个正定的厄米特二(来源：ABb7C论文0909网www.abclunwen.com)次型，运用广义特征值分解求解了复杂结构的声辐射模态，然后利用声辐射模态关于阻抗矩阵与均方速度耦合矩阵的正交性，求解了复杂结构的声辐射效率，最后用具有解析解的脉动球与辐射立方体验证了该方法的有效性。

CAS radiation technology services company in Shanghai of the Chinese Academy of Sciences, the Ministry of radiation technology company in Shanghai's technology subsidiary, and the Chinese Academy of Sciences radiation technology company in 1989 by the Chinese Academy of Sciences of Nuclear Science and Physical and Chemical led the organization of the Chinese Academy of Sciences, owned by high-energy physics Shanghai by the atomic nucleus, Lanzhou Modern Physics, Plasma Physics in Hefei, the Changchun Applied Chemistry, Hefei Chinese Scientific and Technical University jointly established a joint venture and technical input, built for the cable factory in Yantai, Changshu Cable Factory, Liyang Cable Factory, Huaian cable factory Electronic contracting, such as the establishment of a special radiation cross-linking cable production lines and a number of radiation center and computer and new materials production base, by the relevant State Council ministries and provincial and municipal leaders on the importance and recognition, that was the first national high-tech Enterprise units, radiation technology company in 2002 to reform the merger into a new high-tech companies, and the Shanghai Technology Services Division of the Department of independent legal entities and by relying on the Chinese nuclear radiation and high-tech base for the successful trial production of 200-nanometer tetrafluoroethylene Ethylene special engineering plastics ultra-fine powder, consisting mainly expected to add new type of dispersing agent, detergent, antioxidant Kangfu agent, the preparation of a motor vehicle and vessel efficient use of lubricating oil additives series.

中国科学院辐射技术公司上海服务部系原中国科学院辐射技术公司在上海的技术子公司，而中国科学院辐射技术公司是1989年由中科院数理化局核科学处牵头组织中国科学院所属的高能物理所，上海原子核所、兰州近代物理所、合肥等离子物理所、长春应用化学所、合肥中国科技大学共同合资并投入技术建立的，建成后为烟台电缆厂、常熟电缆厂、溧阳电缆厂、淮安电缆厂等承包建立了电子辐照交联特种电缆生产线和一批辐照中心和计算机及新材料生产基地，受到国务院有关部委和有关省市领导的重视和表扬，并被国家认定的第一批高技术企业单位，2002年辐射技术公司进行体制改革合并成新的高技术公司，而上海技术服务部系独立法人单位并依托中科院原子核所辐照基地的高新技术及试制成功的200纳米聚四氟乙烯特种工程塑料超细粉，以此为主料加上新型的分散剂、清净剂、抗氧抗腐剂等，配制成汽车用和船舶用的高效润滑油系列添加剂。

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

In the study of infrared radiation character, different species of tourmaline and Draviteoccurring in pegmatites from Hebei that are different in granularity and heattreatmenttemperature are chose for infrared radiation ratio testing. The result shows:The infraredradiation ratio of tourmaline powder is above 0.80 when the surrounding temperature is 20℃and the testing temperature is below 100℃;Schorl has a close infrared radiation ratio to Dravite,which is higher than Elbaite;No matter to Dravite or Schorl, as the content of ferric oxideincreases, the infrared radiation ratio decreases;tourmaline's size is smaller, its infraredradiation ratio is higher;after tourmaline is heat-treated under 800℃, its infrared radiation ratiodeclines;Dravite heat-treated at 800℃ has the highest infrared radiation ratio, 0.90;andDravite's structure suffers from destruction above 900℃ heattreatment, so its infrared radiationratio goes down.

在红外辐射特性的研究中，本文选择了不同种属电气石、不同粒度和不同热处理温度河北伟晶岩镁电气石进行红外发射率的测试，结果表明：在环境温度为20℃、测试温度为100℃下，电气石粉体红外发射率均在0.80以上；铁、镁电气石红外发射率相近，且大于锂电气石；不论在铁电气石还是在镁电气石中，随氧化铁质量分数的增加，红外辐射率下降；电气石粒径越小，红外发射率越高；电气石在低于800℃以下温度的热处理后，红外发射率下降，800℃热处理电气石红外发射率最高，为0.90，900℃以上电气石结构遭到破坏，红外发射率降低。

A prediction model has been proposed to deal with threshold voltage shift as a function of 1MeV neutron flux and gate oxide thickness, and to deal with room-temperature annealing of threshold voltage shift induced-by 〓Coγ as a function of electric field and gate oxide thickness. The commonness and individuality of MOS device degradation between hot-carrier effect and ionizing radiation were investigated. The dependence of substrate current, gate current and threshold voltage shift due to hot-carrier on gate oxide thickness were simulated with MEDICI-2D simulator. The photocurrents of PN junction and bipolar transistor were studied. Their transient responses on varied bias voltages, pulse durations and absorbed doses were simulated. The influences of NPN base width on base and collector photocurrents were investigated. We also studied 1MeV neutron displacement damage in PN junction, and calculated reverse current leakage under the neutron flux of 2. 67×10〓 per square centimeter. 3 The study of nondestructive screening method for MOS radiation tolerance A theoretical and experimental study of nondestructive screening methods for radiation tolerance of nMOS and pMOS were firstly fulfilled. We determined the informative parameters pertinent to the method and proposed how to deal with experimental data and verify obtained results statistically, as well as make the required steps for nondestructive screening. Based on the experimental data of 180 samples of discrete pMOS devices, the relation between sample quantity and correlation coefficient, screening equation, and other significant results were obtained from the threshold voltage shifts of pre-and post-irradiation samples.

二、分立器件电离和位移辐射损伤响应研究在国内首次开展了电离辐射引起的氧化层阈值电压漂移和退火理论研究，编程计算了1MeV中子引起的MOS器件阈值电压漂移与中子通量及栅氧厚度的关系，计算了〓Coγ光子引起的阈值电压漂移及退火的时效曲线与纵向电场和栅氧厚度的关系等，对评估MOS型集成电路电离损伤和加固方法研究，以及论文中开展的MOSFETs无损筛选方法研究奠定了基础；分析了MOS器件热载流子损伤效应与辐射电离损伤效应之间的异同性，利用二维模拟软件MEDICI-2D模拟了衬底电流和栅电流，在不同栅氧厚度下随栅压的变化曲线，计算了热载流子效应造成的阈值电压漂移，研究结果对当前存在的以热载流子效应研究取代电离辐射损伤实验研究的设想，具有重要的参考价值；开展了PN结和双极晶体管电离光电流研究，计算了不同偏压、不同辐射脉宽和不同吸收剂量下PN结光电流的瞬时响应，计算了不同辐射脉宽下NPN晶体管基极电流和收集极电流的瞬时响应，以及基区宽度对NPN晶体管光电流的影响，研究结果对双极器件抗电离辐射损伤响应及加固方法研究具有重要意义；在国内首次开展了器件位移损伤的理论研究，分析了辐射产生的缺陷对电性能的影响，计算了注量为2.67×10〓cm〓的1MeV中子产生的缺陷对PN结反向电流的影响。

Treatment of disease with radiation ,especially by selective ir radiation with x - rays or other ionizing radiation and by ingestion of radioisotopes.

放射疗法用放射进行的疾病治疗，尤指用X射线或其它电离辐射的有选择放射和吞下放射性同位素

Other types of non-ionizing radiation include visible light, infrared radiation and other forms of electromagnetic radiation with relatively low frequencies.

其他的非电离电磁波还有阳光中的可见光和远红外线。

Based on the damage of the planarian from UV-C radiation and the effect of the radiation on the activities of six enzymes, Dugesia japonica should be very sensitive to UV-C radiation and has application prospects and great potential value in UV radiation detection and screening of the anti-ultraviolet radiation protectants.

不论是从紫外线对日本三角涡虫的损伤情况、还是对其六种酶活力的影响来看，日本三角涡虫是一种对紫外线辐射非常敏感的动物，在检测紫外线辐射及筛选抗紫外线辐射防护剂等方面具有潜在价值和应用前景。

Based on the radiation characteristic of air speedy object, taking into account the synthetic influence factors of the real configuration of object, sun radiation, space long-wave radiation and the environment radiation around object, a further study for the effect of scarfskin pneumatic heating up, used equivalent resistance to estimate inner heat-resource and gave prominence to the influence on scarfskin radiation caused by engine heat-scattering, a logical and effective IR imaging simulation model for airplane is presented in this paper.

从红外辐射和热传导基本定律出发，综合考虑目标实际结构、太阳辐射、天空长波辐射、气动加热及周围环境辐射等因素的影响，依据空中快速目标热辐射特性，分析气动加热对飞机蒙皮辐射的作用，运用等效热阻对内热源部分进行估算，突出发动机传热部分对飞机整体辐射产生的影响，并建立一种可靠实用的空中飞机红外成像仿真模型，仿真过程中结合对空实拍红外图像进行动态调整，目标模拟结果真实感较强。

Based on 45-month NOAA satellite data of radiation, including the absorbed sun radiation, the albedo and outgoing long wave radiation, as well as the formula for the radiation budget, the features are revealed for the zonally and monthly averaged radiation budget in the earth-atmospheric system.

利用温斯顿编制的美国NOAA卫星第一批 45个月辐射观测资料分析图，包括吸收太阳辐射、反射率及射出长波辐射，而地—气系统辐射平衡是用公式计算的。

I was just taking her hand, to help her out of a car, and I knew it.

我只是握着她的手，扶她下车，但我知道这一切。

China and South Korea have excoriated Japan over its approval of new school books which they say whitewash the atrocities committed during Japanese occupation, and anti-Japanese protests have been held in Chinese cities. The lingering bitterness over Japan's past imperialism still threatens to mar relations between the big East Asian powers

中国和韩国强烈谴责日本通过新的中学历史教科书，他们认为这一教科书掩盖了日本在其占领期间所犯下的残酷暴行，反日抗议活动在中国数座城市发生，历史上日本帝国主义制造的痛楚无法被忘却，这有可能破坏东亚强国间的关系。