检索结果-南通市图书馆

The tri-band high spectral resolution spectrometer with gratings in tandem for the charge-exchange recombination spectroscopy diagnostic {2. on HL-2. tokamak

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第6期26卷 103-110页

作者：刘亮余德良马倩何小斐 Maarten DE BOCK Manfred von HELLERMANN Michael WALSH 陈文锦何小雪魏彦玲张能李栋魏会领 the HL-2. Team Southwestern institute of Physics Chengdu 610041People’s Republic of China College of Physics and Optoelectronic Technology Baoji University of Arts and SciencesBaoji 721000People’s Republic of China ITER Organization Route de Vinon-sur-VerdonCS 90046St.Paul Lez Durance Cedex 13067France Fusion Spectroscopy Markgraf-Albrecht Str.14Berlin 10711Germany

Charge-exchange(CX) recombination spectroscopy is a powerful tool monitoring ion temperature and plasma rotation with good temporal and spatial resolutions. A compact, new design for a high-throughput, tri-band high spectral resolution spectrometer has been developed for the charge-exchange recombination spectroscopy measurement on the HL-2. tokamak. The simultaneous measurements of He II(468.57 nm), C VI(52..1 nm), and Dα(656.1 nm accompanied by beam emission spectra) with an acquisition frequency up to 400 Hz are achieved by vertically binning the spectrum from each fiber in experiments. Initial results indicate that the system can provide radial profiles of not only ion temperature and rotation velocity,but also concentration of carbon. For the case of helium, the measurements for the ion temperature and rotation velocity are straightforward but the apparent concentration associated with the observed CX intensity is obviously too high. Modeling of the active He II CX feature including plume contributions needs to be carried out to extract the true helium *** spectrometer could become a prototype for the ITER charge-exchange recombination spectroscopy diagnostic and the pilot experiments, as presented here, demonstrate the possibility of impurity concentrations measurements based on the combined measurement of local beam emission and charge-exchange recombination spectroscopy spectra.

关键词： CXRS ion temperature plasma rotation impurity concentration

On-line matrix addition for detecting aerosol particles

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2006年第2期49卷 187-194页

作者： ZHOU Liuzhu1,2. ZHU Yuan1, GUO Xiaoyong1, ZHAO Wenwu1, ZHENG Hai-yang1, Gu Xuejun1, FANG Li1 & ZHANG Weijun1 1. lab of Environmental Spectroscopy, Anhui institute of Optics and Fine Mechanics, {2. Academy of sciences, Hefei 2.003., china 2. Qufu Normal University, Qufu 2.3.65, china 1. lab of Environmental Spectroscopy Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China 2. Qufu Normal University Qufu 273165 China

Single aerosol particles were measured by matrix-assisted laser desorp-tion/ionization (MALDI) with an aerosol time-of-flight mass spectrometer (ATOFMS). The inlet to the ATOFMS was coupled with an evaporation/condensation flow cell that allowed matrix addition by condensation onto the particles. The coated particles entered the ion source through three-stage differentially pumped capillary inlet and were then ionized by a focused 2.6 nm Nd:YAG laser. The mass spectra and aerodynamic size of the single particles can be obtained simultaneously. The on-line matrix addition technique makes it possible to identify biological aerosols in real-time.

关键词： ATOFMS evaporation/condensation MALDI.

PIXE and INAA studies on ancient potteries from Guangfulin relics in Shanghai

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第11期17卷 1348-1356页

作者： Lin Jiawei1, Cheng Huansheng1, Zhang Zhengquan1, Zhang Bin1, Feng Songlin2. Song Jian3. Gao Menghe4 and Zhu Dan1(1. Applied ion beam Physics {2.oratory, Key {2.oratory of the ministry of Education, institute of Modern Physics, Fudan University, Shanghai 2.043., china 2. Key {2.oratory of Nuclear Analytical Techniques, institute of High Energy Physics, Beijing 10003., china 3. Shanghai Museum, Shanghai 2.0003. china 4. Department of Cultural Heritage and Museology, Fudan University, Shanghai 2.043., china) Applied ion beam Physics {2.oratory Key Laboratory of the Ministry of Education Institute of Modern Physics Fudan University Shanghai 200433 China Key laboratory of Nuclear Analytical Techniques Institute of High Energy Physics Beijing 100039 China Shanghai Museum Shanghai 200003 China Department of Cultural Heritage and Museology Fudan University Shanghai 200433 China

This paper reports the study of ancient potteries unearthed from the Guangfulin site in Shanghai. From the external features of these potteries, archeologists can classify them into two different cultural types: Liangzhu culture (local culture) and a new culture which might be derived elsewhere, but they can not recognize whether they were produced in the same place. Proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA) were used to measure the chemical compositions of the samples and the results were analyzed using multivariate statistics. We found that the two methods can complement each other and their database can be mutually referenced in the study of ancient potteries. Experimental results show that the compositions of the potteries from the two cultural types are different, which means that the materials for ancient potteries of new culture originate from elsewhere. This supports the archaeologists’ speculation that a group of ancient people migrated to Shanghai from some other places 4000 years ago.

关键词： PIXE INAA factor analysis Guangfulin ancient pottery

Photoluminescence from Ge-SiO_2.thin films and its mechanism

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese Science Bulletin 2001年第15期46卷 1268-1271页

作者： DONG Yemin, CHEN Jing, TANG Naiyun, YE Chunnuan, WU Xuemei, ZHUGE Lanjian & YAO Weiguo1. Department of Physics, Suzhou University, Suzhou 2.5006, china 2. Shanghai {3. of Metallurgy, {2. Academy of sciences, Shanghai 2.0050, china Department of Physics Suzhou University Suzhou China Shanghai institute of Metallurgy Chinese Academy of Sciences Shanghai China

Ge-SiO2.thin films were deposited on p-type Si substrates using the radio frequency (rf) magnetron sputtering technique with a Ge-SiO2.composite target. Films were annealed in N2.ambience for 3. min at 3.0℃-1000℃ with an interval of 100℃. Through the X-ray diffract{3., the average size of Ge nanocrystals (nc-Ge) was determined. They increased from 3.9 to 6.1 nm with increasing annealing temperature in the range of 600℃-1000℃. Under ultraviolet excitat{3., all samples emit a strong violet band centered at 3.6 nm. With the format{3. of nc-Ge, the samples exhibit another emiss{3. of orange band with the peak at 580 nm and its intensity increases with the increasing size of *** peak posit{3.s of two bands do not shift obviously. Experimental data indicate that the violet band comes from GeO defect and the orange band originates mainly from the luminescence centers at the interface between the nc-Ge and SiO2.matrix.

关键词： Ge-SiO2 thin films rf magnetron sputtering photolumi- nescence light emitting mechanism.

Collision dynamics of He@C_(60)+He@C_(60) at low energies

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2008年第7期51卷 765-772页

作者： ZHAO Qiang1,2. ZHANG FengShou1,2.3.& ZHOU HongYu1,2.1 Key {3.oratory of beam Technology and Material Modificat{2. of ministry of Educat{2., institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, china 2.Beijing Radiat{2. Center, Beijing 100875, china 3.Center of Theoretical Nuclear Physics, Nat{2.al {3.oratory of Heavy {2. Accelerator of Lanzhou, Lanzhou 73.000, china 1. Key laboratory of beam Technology and Material Modificat{2. of {3.stry of Educat{2. Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100875 China 2. Beijing Radiation Center Beijing 100875 China 3. Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

A semi-empirical molecular dynamics model is developed. The central collisions of C60+C60 and He@C60+He@C60 at different incident energies are investigated based on this model. It is found that the dimer structures have been produced at proper incident energies and these fullerene dimers could be formed by a self-assembly of C60 fullerene and He@C60. The He atom has a significant effect at higher incident energy and this embedded He atom can enhance the stability of the dimer structure.

关键词： C60 He@C60 collision molecular dynamics

systematic study of survival probability of excited superheavy nuclei

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 109-113页

作者： XIA ChengJun1, SUN BaoXi1, ZHAO EnGuang2.3.& ZHOU ShanGui2.3.1College of Applied sciences, Beijing University of Technology, Beijing 10012., china 2.2. of Theoretical Physics, chinese Academy of sciences, Beijing 100190, china 3.enter of Theoretical Nuclear Physics, National laboratory of Heavy ion Accelerator, Lanzhou 73.000, china chinese Acad Sci Inst Theoret Phys Beijing 100190 Peoples R China Beijing Univ Technol Coll Appl Sci Beijing 100124 Peoples R China Ctr Theoret Nucl Phys Natl Lab Heavy Ion Accelerator Lanzhou 730000 Peoples R China

The stability of excited superheavy nuclei (SHN) with 100 Z 13. against neutron emission and fission is investigated by using a statistical model. In particular, a {2.atic study of the survival probability against fission in the 1n-channel of these SHN is made. The present calculations consistently take the neutron separation energies and shell correction energies from the calculated results of the finite range droplet model which predicts an island of stability of SHN around Z = 115 and N = 179. It turns out that this island of stability persists for excited SHN in the sense that the calculated survival probabilities in the 1n-channel of excited SHN at the optimal excitation energy are maximized around Z = 115 and N = 179. This indicates that the survival probability in the 1n-channel is mainly determined by the nuclear shell effects.

关键词： survival probability superheavy elements island of stability neutron emission fission

Pre-irradiation with low-dose ^(12.C^(6+) beam significantly enhances the efficacy of AdCMV-p53.gene therapy in human non-small lung cancer

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2007年第2期50卷 221-230页

作者： LIU Bing1,2.ZHANG Hong1,LI WenJian1,LI Qiang1,ZHOU GuangMing1,XIE Yi1,2.HAO JiFang1,MIN FengLing1,2.ZHOU QingMing1,2.& DUAN Xin1,2. institute of Modern Physics,chinese Academy of {2.,Lanzhou 73.000,china 2.Graduate University of chinese Academy of {2.,Beijing 10003.,china institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000China

The combination of ionizing radiation and gene therapy has been investigated. However, there are very few reports about the combination of heavy-ion irradiation and gene therapy. To determine if the pre-exposure to low-dose heavy ion beam enhances the suppression of AdCMV-p53.on non-small lung cancer (NSLC), the cells pre-irradiated or non-irradiated were infected with 2., 40 MOI of AdCMV-p53. Survival fraction and the relative biology effect (RBE) were determined by clonogenic assay. The results showed that the proportions of p53.positive cells in 12.6+ beam induced AdCMV-p53.infected cells were more than 90%, which were signifi-cantly more than those in γ-ray induced AdCMV-p53.infected cells. The pre-exposure to low-dose 12.6+ beam significantly prevented the G0/G1 arrest and activated G2.M checkpoints. The pre-exposure to 12.6+ beam significantly improved cell to apoptosis. RBEs for the 12.6+ + AdCMV-p53.infection groups were 3.%-60%, 2.%-13.% and 3.%-70% more than those for the 12.6+-irradiated only, AdCMV-p53.infected only, and γ-irradiation induced AdCMVp53.infected groups, respectively. The data suggested that the pre-exposure to low-dose 12.6+ beam significantly promotes exogenous p53.expression in NSLC, and the suppression of AdCMV-p53.gene therapy on NSLC.

关键词： heavy-ion beam gene therapy p53 non-small lung cancer adenoviral vector low dose

Purification and characterization of a novel cholesterol-lowering protein from the seeds of Senna obtusifolia

在线全文

学校读者我要写书评

暂无评论

Science china(Life sciences) 2008年第11期51卷 1020-1024页

作者： LI ChuHua1, LI Mei2. CHANG WenRui2.& GUO BaoJiang1 1 College of Life sciences, South{3. Normal University, Guangdong Provincial Key {2. of Biotechnology of Plant Development, Guang-zhou 51063.,{3. 2.institute of Biophysics, chinese Academy of sciences, Beijing 100101,{3. 1. College of Life sciences South China Normal University Guangdong Provincial Key Lab of Biotechnology of Plant Development Guangzhou 510631 China 2. institute of Biophysics Chinese Academy of Sciences Beijing 100101 China

"Juemingzi", a source of traditional chinese herbal medicine, has been demonstrated to play a role in decreasing serum cholesterol concentration. In this study, a novel protein, which has shown an in-hibitory effect on cholesterol biosynthesis, was isolated from Senna obtusifolia L. seed by gel filtration and ion exchange chromatography. The novel protein’s molecular mass was 19.7 kD and its pI was 4.80. Both SDS-PAGE and isoelectric-focusing (IEF) revealed a single Coomassie brilliant blue stained band, indicating that the novel protein was a single peptide. The N-terminal amino acid sequence of the pro-tein was IPYISASFPLNIEFLPSE, which had no similarity with any other protein sequences in the NCBI protein database. Circular dichroism (CD) signals indicated that S. obtusifolia seed protein contained 12.5% α-helix, 55.6% β-sheet, and 3..9% random coil.

关键词： Senna obtusifolia L. seed novel protein purification biochemical properties cholesterol biosynthesis

Transferring gfp gene with ion implantation and transient expression of gfp in liliaceous pollen cells

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2004年第11期 91-94+101-102页

作者： YUAN Shibin 1, CHEN Qizhong 1, WANG Yugang 1*, ZHAO Weijiang 1, XU An 2. YANG Gen 2. WANG Wenxian 2.and WU Lijun 2.(1. institute of Heavy ion Physics, Peking University, Beijing 100871,{2. 2. institute of Plasma Physics, chinese Academy of sciences, Hefei 2.003.,{2.) instituteofHeavyionPhysics PekingUniversityBeijing100871China instituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031China

Liliaceous pollen cells were implanted by 4.0 MeV C 2. ion beam or by 2..0 keV N + ion beam. Laser confocal scanning microscopy (LCSM) of the implanted intact samples showed that parts of the implanted pollen cells could be stained by propidium iodide (PI). This indicated that energetic ion beam could directly act on cells beneath the pollen coats and made channels for entry of the molecules from outside of the cells. LCSM analysis of green fluorescent protein (GFP) showed that energetic ion beam could mediate transient expression of gfp in treated pollen cells. Compared with 2..0 keV N + ion beam, implantation of 4.0 MeV C 2. ion beam greatly improved gene transfer efficiency in pollen cells.

关键词： MeV ion implantation radiation damage pollen gfp transient expression.