检索结果-南通市图书馆

In-vivo behavior of tin-radiopharmaceuticals

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2003年第2期14卷 127-130页

作者： HE Jia-Heng, LUO Shun-Zhong, WANG Guan-Quan, YANG Yu-Qing, PU Man-Fei, LIU Guo-Ping (Institute of Nuclear Physics and Chemistry, the Chinese Academy of Engineering Physics, Mianyang 621900) Institute of Nuclear Physics and Chemistry the Chinese Academy of Engineering Physics Mianyang 621900

Tin is an essential ingredient of most technetium-99m radiopharmaceuticals but its in-vivo distribution and long-term fate are not well understood. This work describes distribution in mice of several tin-117m labeled compounds. The results indicate that stannic-HEDTMP appears to be the best overall bone localizing agent with very low blood, muscle, kidney, or liver uptake, and its binding to bone is higher than that of tin-117m-DTPA, which make it potentially useful as an agent for skeletal scintigraphy and radiotherapy of bone tumors.

关键词：放射性药品锡骨肿瘤闪烁扫描法放射线疗法

The Influence of Temperature on the Afterglow Feature of SrAl_2O_4∶Eu,Dy Phosphors

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2006年第3期21卷 120-122页

作者：王兵 Materials School Southwest University of Science and TechnologyMianyang 621010China

Using a self-designed temperature testing box in which Xenon-lamp irradiation can be applied, the afterglow feature of SrAl2O4： Eu, Dy as a function of temperature has been researched. Two sorts of SrAl2O4 ： Eu, Dy phosphors, namely highest quality commercial one and the self-synthesized one by solid-state reaction process were employed. Results reveal a common phenomenon behaving as phosphorescent sudden extinguishments at a certain low temperature although their threshold temperature value （ about 223 K） has a slight difference . The general charueteristic for the influence of temperature on the afterglow feature presents, compared to the luminescent decay at room temperature （RT）, a bigger and faster decrease of phosphorescent brightness with the reduction of temperature, while decay curves still maitain the same pattern composed of a quick decline part and a platform falling part during which the phosphorescent brightness at 273 K is only aboat 1/2 as big as that at RT, and at 253 K the figure has changed to about 1/3. Finally , the reason of previous observed results has been analyzed briefly in theory.

关键词： afterglow SrAl2O4:Eu,Dy low temperature

HIGH RESOLUTION PARAMETRIC MODELLING FOR TWO-DIMENSIONAL RADAR TARGET USING PRONY ALGORITHM

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2000年第1期17卷 38-45页

作者： Wang Jun (Institute of Electronic Engineering, Chinese Academy of Engineering and Physics, Mianyang 621900)

On the conditions of low-resolution radar, a parametric model for two-dimensional radar target is described here according to the theory of electromagnetic scattering and the geometrical theory of diffraction. A high resolution estimation algorithm to extract the model parameters is also developed by building the relation of the scattering model and Prony model. The analysis of Cramer-Rao bound and simulation show that the method here has better statistical performance. The simulated analysis also indicates that the accurate extraction of the diffraction coefficient of scattering center is restricted by signal to noise ratio, radar center frequency and radar bandwidth.

关键词： Two-dimensional radar Scattering center attributes Parametric modelling Prony algorithm Resolution

Ammniation Reaction Course of Trichlorodinitrobenzene

在线全文

学校读者我要写书评

暂无评论

Ammniation Reaction Course of Trichlorodinitrobenzene

Fast Z-Pinch,A New Approach for Promising Fusion Energy

2003年国际推进剂、炸药、烟火技术秋季研讨会

作者： LI Botao (Institute of Chemical Materials CAEP Mianyang 621900 Sichuan China)

＜正＞ The ammonation course of the trichlorodinitrobenzene is *** of all, the chlorine of No.2 carbon is replaced by amino group. Second, the chlorine of No.4 and No.6 carbon is replaced by amino group. The ammonation become difficulty and the reaction rate is slower along with to enter amino group and to increase the density of@@@@@@@@@@@@@@@electron cloud.

关键词： trichlorodinitrobenzene ammonation course

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

工程科学（英文版） 2007年第4期5卷 36-44页

作者： Peng Xianjue,Hua Xinsheng(China Academy of Engineering Physics,Mianyang Sichuan 621900,China)

The basic concept of fast Z-pinch,and late progress in fast Z-pinch plasma research as HEDP and ICF research,especially as an approach for high yield low-cost fusion energy research,are summarized in this *** possible... 详细信息

关键词： fast Z-Pinch implosion HEDP ICF fusion energy

Simulation Study on Final Status Survey of Decommissioning Site

在线全文

学校读者我要写书评

暂无评论

Simulation Study on Final Status Survey of Decommissioning S...

Theoretical study of aging effects on LaNi_(5) tritium storage

The Second Asian and Oceanic Congress for Radiation Protection

作者： Gu Jiande Zhang Taiming(Institute of Nuclear Physics and Chemistry CAEP Sichuan Mianyang 621900)

This paper described a simulation study for final status survey of decommissioning site of nuclear *** simplified,w e supposed that nuclide contaminated in site soil is not present in background,and radioactive nuclide concentration in soil complied with the uniform distribution in interval[o,l].Thus,we express a value of nuclide concentration as random number which belongs to uniform distribution and perform random *** we used two analysis methods（parameter estimate method and non parameter statistical test（Sign Test）method）conducted a simulation to sampling process for final status *** simulated findings indicate that there should be a principal flow diagram of sampling process and a decision rule terminating sampling *** procedures also can be appropriate for any monitoring.

关键词： Decommissioning final status survey simulation.

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

Science China(Physics,Mechanics & Astronomy) 2005年第6期48卷 676-686页

作者： PING Feilin1,2, JIANG Gang1, ZHANG Lin2 & ZHU Zhenghe1 1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China 2. Research Center of Laser Fusion, Mianyang 621900, China Institute of Atomic and Molecular Physics Sichuan University Chengdu China Research Center of Laser Fusion Miangyang China

The electronic structure and energy of La2Ni10H12 and La2Ni10H11He (He is at tetrahedral, octahedral or twelve-face polyhedral interstitials) double cells have been calculated using the density functional theory. Their equilibrium structure, energy bands, electronic density of states (DOS) and X-ray diffraction are presented and discussed. The results indicate the helium-3 produced due to the decay of tritium is most possibly sited at twelve-face polyhedral and octahedral interstices and changes the thermodynamic properties of LaNi5 tritide system. The changes due to aging such as the reduction in the isotherm plateau pressure, increase of the isotherm plateau slope, and appearance of deeply trapped hydrogen are caused not only by the lattice expansion, but also by modification of the electronic structure due to the presence of He.

关键词： LaNi5 alloy, density functional theory, electronic structure, aging.

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2004年第6期47卷 466-479页

作者： SONG Huajie1,2, XIAO Heming1 & DONG Haishan2 1. Department of Chemistry, Nanjing University of Science and Technology, Nanjing 210094, China 2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China Department of Chemistry Nanjing University of Science and Technology Nanjing China Institute of Chemical Materials China Academy of Engineering Physics Mianyang China

The symmetry-adapted perturbation theory (SAPT) that has the ability in decompo- sition of the total interaction energy into physically meaningful components is used to provide a more fundamental understanding of intermolecular forces. This work was motivated by the diffi- culty of standard SAPT in computing the intermolecular interactions for large energetic dimer systems. SAPT based on Kohn-Sham orbitals (SAPT(DFT)) proves computationally efficient for these large systems, but has been shown to perform poorly for interaction energy components. The deficiencies of SAPT(DFT) result from wrong asymptotical behaviors of commonly used exchange-correlation potentials. To remove the deficiencies, two asymptotic corrections by means of van Leeuwen and Baerends (LB) model potential and Fermi-Amaldi (FA) type potential were applied into three small test systems comprising He2, HF2 and (N2)2 and a set of larger ni- tramide dimers at several separations. The results showed that when utilizing newly developed frequency-dependent density susceptibilities (FDDS) technique for computing dispersion energy, the FA asymptotic correction is very effective to circumvent these deficiencies in SAPT(DFT) and yields a good accuracy over the LB correction. The FA corrected SAPT(DFT) approach is capa- ble of correctly predicting all the quantitative trends in binding energies for all test cases and substantially reduces computational cost as compared with the standard SAPT calculations. The successful application of the approach to nitramide dimer demonstrates that it potentially pro- vides a good means to calculate accurately intermolecular forces in larger system such as en- ergetic systems.

关键词： intermolecular interaction, density functional theory (DFT), symmetry adapted perturbation theory (SAPT), asymptotic correction, frequency-dependent density susceptibilities (FDDS).

Emittance Influence for Zumbro Lens in Proton Radiography

在线全文

学校读者我要写书评

暂无评论

Emittance Influence for Zumbro Lens in Proton Radiography