检索结果-南通市图书馆

science china Earth sciences 2005年第10期48卷 1649-1655页

作者： MIN Maozhong1,2, LUO Xingzhang3. WANG Ju4, JIN Yuanxin4 & WANG Rucheng1 1. department of Earth sciences, State Key Laboratory of Mineral Deposit Research, nanjing university,{3., china 2. Center of Materials Analysis, nanjing university,{3., china 3. department of environmental science and engineering, nanjing university,{3., china 4. Beijing Geology Institute, Nuclear Industry, Beijing 100029, china nanjing university Nuclear Industry

The first results of sorption experiments of U(VI), 23.U(VI) and 23.U(VI) onto original (unpurified) fracture-filling clays from No.1 monzonitic granite intrusion, Beishan area, Gansu Province, china are reported. The monzonitic granite intrusion is a potential location for a high-level radwaste (HLW) repository in china. The present experimental results show that the maximum U(VI) sorption reached 92% at near-neutral pH and the distribution coefficient (Kd) was 1226 mL/g. A high sorption capacity of the fracture-filling clays in host rock on radioactive ele-ments is necessary for HLW deep geological disposal repository. No preferential sorption of 23.U onto the clays was found. Finally, the sorption of U(VI) onto the clays was also modeled using a surface complexation model.

关键词： HLW geological disposal repository, granite, uranium, radionuclide, clay, sorption.

Quantitativ　estructure－activity　relationships　for　studying　alkyl（1－phenylsulfonyl）　cycloalkane－carboxylates

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1996年第2期8卷 157-166页

作者： He Yibing Wang Liansheng (department of environmental science and {3., nanjing university, nanjing 210093, china) department of environmental science Nanjing University Nanjing 210093 China

Octanol/water partition coefficients,adsorption coefficients for soils and sediments and acute toxicities to Daphnia magna of 28 alkyl (1-phenylsulfonyl) cycloalkane-carboxylates were measured. These properties were correlated by linear solvation energy relationship (LSER) and chromatographic retention data determined by reverse-phase high performance liquid chromatography (RP-HPLC). The accuracy and range of applicability of these two quantitative structure-activity relationship (QSAR) methods were compared in this paper.

关键词： alkyl (1-phenylsulfonyl) cycloalkane-carboxylates LSER R-PHPLC.

Effects　of　copper，manganese　and　pH　on　the　growth　and　several　enzyme　activities　of　mycorrhizal　fungus　Cenococcum　geophilum　Fr．

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1996年第4期8卷 419-425页

作者： Kong Fanxiang Zhang Min(department of environmental science and {3., nanjing university,nanjing 210093,china) department of environmental science Nanjing University Nanjing 210093 China

he effects of various concentrations of copper,manganese and ph on the growth,protein content and several enzyme activities of mycorrhizal fungus Cenococcum geophilum Fr. Were *** results showed that high concentration of copper (20 mg/L)and low ph (3.0-4.0) inhibited the mycelial growth (dry weight), however, the protein content increased or not significantly reduced in mycelia after copper or manganese was applied. The activities of acid phosphatase and α-mannosidase were induced by high concentration of Mn (200-400 mg/L);but the activities of G6PDH, MTLDH and trehalase were inhibited by high content of copper(10-20 mg/L),both of the responses of these enzymes and mycelial growth under the presence of copper were correlative each other. Measurement of these enzyme activities might therefore provide a useful criterion for the evaluation of the fungitoxicity of soil contaminated by copper.

关键词： copper manganese ph mycorrhizal fungus enzyme activity.

Study on the thermal stability and electrical properties of the high-k dielectrics (ZrO_2) _x(SiO_2)_(1-x)

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2009年第8期52卷 2222-2226页

作者： Lü ShiCheng1,2, YIN Jiang1,2, XIA YiDong2,3. GAO LiGang2,3.& LIU ZhiGuo2,3.1 department of Physics, nanjing university, nanjing 210093,{3. 2 National Laboratory of Solid Sate Microstructures, nanjing university, nanjing 210093,{3. 3.department of Materials science and engineering, nanjing university, nanjing 210093,{3. department of Physics Nanjing University Nanjing China National Laboratory of Solid Sate Microstructures Nanjing University Nanjing China department of Materials science and engineering Nanjing University Nanjing China

(ZrO2)x(SiO2)1-x (Zr-Si-O) films with different compositions were deposited on p-Si(100) substrates by using pulsed laser deposition technique. X-ray photoelectron spectra (XPS) showed that these films remained amorphous after annealing at 800℃ with RTA process in N2 for 60 s. The XPS spectra indi- cated that Zr-Si-O films with x=0.5 suffered no obvious phase separation after annealing at 800℃, and no interface layer was formed between Zr-Si-O film and Si substrate. While Zr-Si-O films with x >0.5 suffered phase separation to precipitate ZrO2 after annealing under the same condition, and SiO2 was formed at the interface. To get a good interface between Zr-Si-O films and Si substrate, Zr-Si-O films with bi-layer structure (ZrO2)0.7(SiO2)0.3.(ZrO2)0.5(SiO2)0.5/Si was deposited. The electrical properties showed that the bi-layer Zr-Si-O film is of the lowest equivalent oxide thickness and good interface with Si substrate.

关键词： high-k dielectric film pulsed laser deposition pseudo ternary alloy

MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY ^(13.C-NMR METHOD

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer science 1999年第2期17卷 135-140页

作者： Song Wang Xiao-hu Yan Rong-shi Cheng department of Polymer science and engineering,{3., nanjing 210093, china department of Polymer science and engineering Nanjing University Nanjing 210093 China

^(13.C-NMR ~1H-decoupled spectra of styrene polymers were assigned by comparison with modelcompounds, then used in measurements of number average molecular weights. The higher limit of an exactdetermination of the end group signal is less than a molecular weight of 10~4. For polymer samples withM_n3. the results obtained from ^(13.C-NMR spectra of saturated carbon region are in excellent agreementwith the values determined by ~1H-NMR, SEC, and VPO methods, while the results from ^(13.C-NMR spectra ofphenyl C-1 carbon region are somewhat higher than the values determined by other methods.

关键词： Molecular weight measurement Styrene oligomer ^(13.C-NMR spectra

Polymer-assisted nanoparticulate contrast-enhancing materials

在线全文

学校读者我要写书评

暂无评论

science china Chemistry 2010年第3期53卷 479-486页

作者： DING Yin1,3.HU Yong2,WU Wei1 & JIANG XiQun1 1Laboratory of Mesoscopic Chemistry and department of Polymer science and engineering,College of Chemistry & Chemical engineering,nanjing university,nanjing 210093,china 2National Laboratory of Solid State Microstructure,department of Material science and engineering,nanjing university,nanjing 210093,china 3.ey Laboratory of Analytical Chemistry for Life science,Ministry of Education,School of Chemistry and Chemical engineering,nanjing university,nanjing 210093,china Laboratory of Mesoscopic Chemistry and department of Polymer science and engineering College of Chemistry & Chemical Engineering Nanjing University Nanjing China Key Laboratory of Analytical Chemistry for Life science Ministry of Education School of Chemistry and Chemical Engineering Nanjing University Nanjing China National Laboratory of Solid State Microstructure Department of Material Science and Engineering Nanjing University Nanjing China

The application of nanotechnology in medicine research has significant potential in modern biomedical research,disease diagnosis and *** fluorophore-based detection techniques have been widely used as imaging and signal transduction tools for the detection of trace levels of *** photosensitivity of the fluorophores,however,limits their application in such complex environments as living bio-systems where degradation or photobleaching *** nanoparticles have unique and stable optical,electrical,magnetic and catalytic properties because of their various shapes,sizes and *** potential of the nanoparticles as novel imaging agents has been studied as a possible solution to this *** modification of inorganic nanoparticles could enhance their biostability in physiological conditions and ability of targeting bioactive molecules.

关键词： contrast agent cell image gold nanoparticles iron oxide nanoparticles carbon nanotubes polymeric-inorganic hybrid nanoparticles

Extraction of the spectral information of terahertz signals using superconducting Josephson junction

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2010年第5期53卷 1247-1251页

作者： XU WeiWei,CHEN Jian,KANG Lin & WU PeiHeng department of Electronic science & engineering,{3. university,{3. 210093,china department of Electronic science & engineering Nanjing University Nanjing China

Using YBa2Cu3.7-δ/MgO bicrystal Josephson junction,we have developed a setup for spectrum analyses of terahertz signals,up to 2.5 THz,with a frequency resolution of 3.*** junction works at liquid nitrogen temperature when the signal frequencies are low while for signals at 1.6 THz and 2.5 THz the junction is cooled to 6 *** signal processing(DSP) chips are made use of to build a data acquisition and processing system so that it can be compact,fast,and *** the completion of the relevant hardwares and softwares,the measurements are now automated.

关键词： Josephson junction THz wave spectrum detection DSP technology

Genotoxicity　of　substituted　nitrobenzenes　and　the　quantitative　structure－activity　relationship

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1996年第1期8卷 103-109页

作者： Huang Qingguo Liu Yongbin Wang Liansheng Han Shuokui(department of environmental science and {3.,nanjing university,nanjing 210093,china)Yang Jun(Jiangsu Metallurgy Institute.nanjing 210007,china)

The genotoxicity of 22 substituted nitrobenzenes were evaluated by the chromosome aberrations test in in vitro human peripheral lymphocytes.18 of 22 compounds exhibit genotoxic *** structure-activity relationship model was established to correlate the genotoxicity of substituted nitrobenzenes with the characteristics of the substituents on benzene ring.

关键词： quantitative structure-activity relationship(QSAR) substituted nitrobenzenes genotoxicity.

Quantitative structure－activity study on the reductive dehalogenation potency of the halogenated aromatics

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1995年第2期7卷 183-189页

作者： Huang Qingguo Wang Liansheng Han Shuokui(department of environmental science and Technology,{3. , nanjing 210008 , china) Dept of Envmlt Sci & Tech Nanjing Univ Nanjing China

Ｑｕａｎｔｉｔａｔｉｖｅｓｔｒｕｃｔｕｒｅ－ａｃｔｉｖｉｔｙｓｔｕｄｙｏｎｔｈｅｒｅｄｕｃｔｉｖｅｄｅｈａｌｏｇｅｎａｔｉｏｎｐｏｔｅｎｃｙｏｆｔｈｅｈａｌｏｇｅｎａｔｅｄａｒｏｍａｔｉｃｓＨｕａｎｇＱｉｎｇｇｕｏ；... 详细信息

Ｑｕａｎｔｉｔａｔｉｖｅｓｔｒｕｃｔｕｒｅ－ａｃｔｉｖｉｔｙｓｔｕｄｙｏｎｔｈｅｒｅｄｕｃｔｉｖｅｄｅｈａｌｏｇｅｎａｔｉｏｎｐｏｔｅｎｃｙｏｆｔｈｅｈａｌｏｇｅｎａｔｅｄａｒｏｍａｔｉｃｓＨｕａｎｇＱｉｎｇｇｕｏ；ＷａｎｇＬｉａｎｓｈｅｎｇ；Ｈａｎ...

关键词： quantitative structure - activity relationship(QSAR) halogenated arornatics dehalogenation poten-cy discriminant function.

Effects of lead，cadmium，mercury chlorides and aquatic environmental samples on the growth of Escherichia coli

在线全文

学校读者我要写书评

暂无评论

Journal of environmental sciences 1995年第4期7卷 455-460页

作者： Xu Chao(department of environmental science and {3. , nanjing university , nanjing 210093 , china)Yuan Jing(department of Plants , Soils , and Biometeorology , Utah State university , Logan , Utah 843.2-4820, U. S. A)Xu Heping(environmental Monito Dept of Envmtl Sci Nanjing Univ Nanjing China China

Ｅｆｆｅｃｔｓｏｆｌｅａｄ，ｃａｄｍｉｕｍ，ｍｅｒｃｕｒｙｃｈｌｏｒｉｄｅｓａｎｄａｑｕａｔｉｃｅｎｖｉｒｏｎｍｅｎｔａｌｓａｍｐｌｅｓｏｎｔｈｅｇｒｏｗｔｈｏｆＥｓｃｈｅｒｉｃｈｉａｃｏｌｉＸｕＣｈａｏ（Ｄｅｐａｒ... 详细信息

Ｅｆｆｅｃｔｓｏｆｌｅａｄ，ｃａｄｍｉｕｍ，ｍｅｒｃｕｒｙｃｈｌｏｒｉｄｅｓａｎｄａｑｕａｔｉｃｅｎｖｉｒｏｎｍｅｎｔａｌｓａｍｐｌｅｓｏｎｔｈｅｇｒｏｗｔｈｏｆＥｓｃｈｅｒｉｃｈｉａｃｏｌｉＸｕＣｈａｏ（ＤｅｐａｒｔｍｅｎｔｏｆＥｎｖｉｒｏｎｍｅｎ...

关键词： heavy metal ions Escherithia coli two - way growth effects.