检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

自旋为任意整数的传播子

物理学报 2003年第8期52卷 1882-1890页

作者：黄时中张鹏飞阮图南吴宁郑志鹏中国高等科学技术中心(世界实验室)

以自旋为任意整数的自由粒子的波函数 (Bargmann Wigner方程的解 )为基础 ,进一步研究了自旋为任意整数的投影算符和传播子 .证明了Behrends和Fronsdal所构造的投影算符是正确的 .导出了自旋为任意整数的场的一般对易规则和费恩曼传播... 详细信息

以自旋为任意整数的自由粒子的波函数 (Bargmann Wigner方程的解 )为基础 ,进一步研究了自旋为任意整数的投影算符和传播子 .证明了Behrends和Fronsdal所构造的投影算符是正确的 .导出了自旋为任意整数的场的一般对易规则和费恩曼传播子的一般表达式 .

关键词：整数自旋自由粒子波函数投影算符对易规则费恩曼传播子高能物理

Adenovirus-mediated expression of Tob1 sensitizes breast cancer cells to ionizing radiation

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第10期28卷 1628-1636页

作者： Yang JIAO~2,Chun-min GE~3.Qing-hui MENG~2,Jian-ping CAO~2,Jian TONG~2,Sai-jun FAN~(2,3.4)~2 School of Radiology and Public Health,Soochow University,Suzhou 215123.china,~3.Department of Oncology,Lombardi Comprehensive Cancercenter,Georgetown University,Washington DC 20057,USA School of Radiology and Public Health Soochow University Suzhou 215123 China Department of Oncology Lombardi Comprehensive Cancer Center Georgetown University Washington 20057 DC USA

Aim:To investigate the effect of the Tob1 gene,a member of the TransducingMolecule of ErbB2/B-cell Translocation Ggene (TOB/BTG) family,by usingthe adenovirus-mediated expression of Tob 1 on radiosensitivity in a human breastcancer cell line ***:Cell survival was determined byclonogenic *** was evaluated by DNA fragmentation gel electro-phoresis and terminal deoxynucleotidyl transferase-mediated nick end *** expression was analyzed by Western blot assay and DNA repairwas measured by a host cell reactivation ***:We demonstrated thatpre-irradiation treatment with Ad5-Tob 1 significantly increased radiosensitivity,accompanying the increased induction of apoptosis and the repression of DNAdamage ***,Ad5-Tob 1-mediated radiosensitivity correlates withthe upregulation of the pro-apoptotic protein Bax and the downregulation ofseveral DNA double strand break repair proteins,including DNA-dependent pro-tein kinases,Ku70 and Ku80,and X-ray-sensitive complementation group ***:Tob1,as a new radiosensitizer,is a new target in the radiotherapyof breast cancer via increasing apoptosis and suppressing DNA repair.

关键词： Tobl breast cancer radiosensitivity radiation

The role of atmospheric aerosol composition in climate change

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1993年第2期5卷 169-175页

作者： Su Weihan Wang ShaobinResearch center for Eco- Environmental Sciences, Chinese Academy of Sciences Beijing 100085, china

The chemical composition of atmospheric aerosols has been investigated. Contributions ofsulfate and soot in aerosols to the atmospheric extinction are studied. Discussions are made on the problems of aerosol emitted from volcano, forest fires in northern china, 1987 and oil field fires in Kuwait, 1991. It is indicated that the changes in concentration, particle size, and chemical composition of aerosol after those events could have impacts on the climate change either regionally or globally and that the impact of aerosol particles on climate change could compensate for some temperature increase caused by greenhouse gases and the increase of surface intensity of ultraviolet radiation due to ozone layer depletion.

关键词： atmospheric aerosol chemical composition climate change.

Air-sea heat flux exchange over the South china Sea under different weather conditions before and after southwest monsoon onset in 2000

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2003年第3期22卷 369-383页

作者： Junyue Yan, Huadong Yao, Jianglong Li, Zhiyi Tang, Guorong Jiang, Wenyu Sha, Xunqiang Li, Yiguo Xiao National Climate center, Beijing 100081, china. E-mail: yanjy@cma.gov.cnPLA University of Science Technology, Nanjing 211101, china Natl Climate Ctr Beijing 100081 Peoples R China PLA Univ Sci Technol Nanjing 211101 Peoples R China

With the data observed from the Second SCS Air-Sea Flux Experiment on the Xisha air-sea flux research tower, the radiation budget, latent, sensible heat fluxes and net oceanic heat budgets were caculated before and after summer monsoon onset. It is discovered that, after summer monsoon onset, there are considerable changes in air-sea fluxes, especially in latent heat fluxes and net oceanic heat budget. Furthermore, the analyzed results of five synoptic stages are compared. And the characteristics of the flux transfer during different stages around onset of South china Sea monsoon are discussed. The flux change shows that there is an oceanic heat accumulating process during the pre-onset and the break period, as same as oceanic heat losing process during the onset period. Moreover, latent fluxes, the water vapor moving to the continent, even the rainfall appearance in Chinese Mainland also can be influenced by southwester. Comparing Xisha fluxes with those obtained from the Indian Ocean and the western Pacific Ocean, their differences may be observed. It is the reason why SSTs can keep stable over the South china Sea while they decrease quickly over the Arabian Sea and the Bay of Bengal after monsoon onset.

关键词： South china Sea air-sea heat fluxes South china Sea monsoon

Environmental radioactivity level at a mantle factory in eastern Zhejiang

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2003年第4期14卷 272-277页

作者： YE Ji-Da, ZENG Guang-Jian, WU Zong-Mei, LIU Hong-Shi, NI Shi-Ying (Zhejiang Province Environmental radiation Monitoring center, Hangzhou 3.0012) Zhejiang Province Environmental radiation Monitoring center Hangzhou 310012

The γ radiation level, alpha potential energy of thoron and alpha surface contamination level at amantle factory in the east of Zhejiang Province are reported. The measured results show that the additional annual ef-fective dose equivalent absorbed by the worker in some workshops of the factory was higher than 15mSv-management limit. The alpha surface contamination on the workers' hands in some workshops was 10 timesmore than the management limit of National Standard (0.04 Bq/cm2). The mantle factory's main danger to body wasinternal irradiation of α rays from thoron aerosol.

关键词：环境放射性浙江 α表面污染钍环境监测

Monitoring of the 2011 spring low ozone events in the Arctic region

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第27期56卷 2893-2896页

作者： LIU NianQing 1,2 , HUANG FuXiang 1,2 WANG WeiHe 1,2 1 National Satellite Meteorological center, Beijing 100081, china 2 Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, china Meteorological Administration, Beijing 100081, china National Satellite Meteorological center Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites China Meteorological Administration

Data from FY-3. SBUS and NOAA SBUV/2 were used to monitor ozone levels in the Arctic region from March 1 to April 5, 2011. Results revealed a significant ozone depletion in the area, with total ozone levels between 200-250 DU. The ozone levels recorded were 100-200 DU below normal, and in some parts the levels were as low as 200 DU, indicating a mini ozone-hole. During the sampling period, the ozone depletion area underwent identifiable expansion and detraction, a rotation around the North Pole from the west to the east, and a longitudinal movement from the Pole, spreading to the mid latitudes. The effects of these rare low ozone events were not only felt in the Arctic, but also extended to densely populated areas between Europe and the middle of Russia. In this region, rapidly increasing levels of ultraviolet radiation were detected at the Earth's surface. Given the significant risk that this poses to both the environment and people's health, this occurrence has significant global implications.

关键词：北极地区臭氧水监测事件人口稠密地区中纬度地区 NOAA 调查结果

手动跟踪方阵面上辐照度及曝辐量计算公式的推导

在线全文

学校读者我要写书评

暂无评论

太阳能学报 2002年第4期23卷 509-513页

作者：艾彬宋淑芳季秉厚宋进华中国科学院半导体研究所内蒙古大学新能源研究中心呼和浩特010021 内蒙古大学新能源研究中心内蒙古气象研究所

推导出了方位角手动跟踪和极轴时角手动跟踪方阵面上曝辐量及辐照度的计算公式。根据二连浩特实测的日射资料 ,计算了不同手动跟踪方阵面上各月的曝辐量 ,比较了不同跟踪方式下太阳电池方阵各月接受的曝辐量。

关键词：手动跟踪方阵面辐照度曝辐量计算公式推导方位角极轴时角数学公式太阳能电池

A Method to Confirm the Power of Complex Electromagnetic Environment Simulator

在线全文

学校读者我要写书评

暂无评论

A Method to Confirm the Power of Complex Electromagnetic Env...

偏置电场对THz辐射强度影响的蒙特卡罗模拟

The 8th International Symposium on Antennas,Propagation and EM Theory（ISAPE2008）

作者： Liu hongyi 1,Guo wensheng 2,Feng wei 3.Ding hao china Ordnance Test center,Baicheng,Jilin Province china {3.001

With the development of the complexity of the electromagnetic environment in the battlefield,the careful check in the complex electromagnetic environment,which is simulated to the actual battle,is strongly needed for the weapon *** paper shows the author's own perspective on the problem of complex electromagnetic environment modeling and how to definite radiation power of simulator.

关键词： A Method to Confirm the Power of Complex Electromagnetic Environment Simulator

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

浙江大学学报（工学版） 2012年第5期46卷 899-904页

作者：徐英洪治中国计量学院太赫兹技术与应用研究所浙江杭州310018 浙江大学光及电磁波研究中心浙江杭州310058

采用系综蒙特卡罗方法对光生载流子在偏置电场作用下的输运过程进行模拟,从微观角度研究偏置电场对连续太赫兹辐射强度的影响.模拟结果表明,由于空间电荷电场屏蔽效应以及散射等因素的影响,太赫兹辐射强度先是随偏置电场的增强而上升,... 详细信息

采用系综蒙特卡罗方法对光生载流子在偏置电场作用下的输运过程进行模拟,从微观角度研究偏置电场对连续太赫兹辐射强度的影响.模拟结果表明,由于空间电荷电场屏蔽效应以及散射等因素的影响,太赫兹辐射强度先是随偏置电场的增强而上升,当达到峰值后逐渐趋于饱和.虽然降低温度使粒子发生散射的几率降低,但同时也减小粒子的初始能量,故低偏置电场时低温下连续太赫兹辐射功率比常温下小,而当偏置电场超过某一阈值时,降低温度能够提高连续太赫兹辐射功率.

关键词：连续太赫兹辐射偏置电场蒙特卡罗模拟光子混频