检索结果-南通市图书馆

Biomimetic preparation of elastomeric fibers with micro/nano structures on the surfaces

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2012年第5期22卷 493-501页

作者： Quanyong Liu a,Liqun Zhang c,Lei Jiang a,b a Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education,School of chemistry and Environment,Beihang university,beijing 100191,PR china b beijing National Laboratory for Molecular sciences(MNLMS),Key Laboratory of Organic Solids,Institute of chemistry,chinese academy of sciences,beijing 100190,PR china c State Key Laboratory of Organic-Inorganic Composites,beijing university of chemical Technology,beijing 100029,PR china [a] Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing 100191 PR China [b] beijing National Laboratory for Molecular sciences (MNLMS) Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 PR China [c] State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical Technology Beijing 100029 PR China

Bioinspired by the spinning of spider silks,the biomimetic preparation of elastomeric fibers with micro/nano structures on the surfaces was attempted,and as a result,three types of ultrafine fullvulcanized powdered nitrile-butadiene rubber(UFPNBR)/thermoplastic polyurethane(TPU) fibers were *** first fiber was only decorated by the micron-sized grooves on the surface,and the second fiber was dotted by both the micron-sized grooves and nanometer-sized spheres on the surface,while the third fiber was helical and with a concave-convex *** biomimetic preparation mainly consisted of four steps,and the formation mechanism was described as an integrated mechanism of diffusion,coagulation,self assembly,and microphase *** micro/nano structures on the fibers were controlled by changing the mass ratio of UFPNBR to TPU and environment of vertical *** UFPNBR/TPU elastomeric fibers were hoped to have an integrated function of superhydrophobicity,self cleaning,and mechanical improvement of toughness or strength.

关键词： Biomimetic preparation Elastomeric fiber Micro/nano structure Self assembly Spider silk

Physico-chemical Characteristics and Environmental Significance of Snow Deposition on Haxilegen Glacier No.51 in Tian Shan,china

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 Mountain Science 2011年第3期8卷 484-494页

作者： DONG Zhiwen LI Zhongqin ZHANG Mingjun WANG Feiteng WU Lihua State Key Laboratory of Cryospheric sciences Cold and Arid Regions Environmental and Engineering Research Institute /Tianshan Glaeiological Station CAS Lanzhou 730000 China college of Geography and Environment Science Northwest Normal University Lanzhou 730070 China graduate university of chinese academy of sciences Beijing 100049 China

Snow chemistry on the glaciers of alpine regions is a good indicator of atmospheric environmental *** examine snow chemistry in three snowpits at different altitudes on the Haxilegen Glacier No.51,in the Kuitun River source,Tian Shan,china,during July-September 2004 to *** use correlation analysis,factor analysis and sea-salt tracing methods to examine the characteristics and sources of major ions and mineral dust particles in the *** show that mineral dust particles and major ions in the snow pits vary *** the Asian dust period in springtime,the concentration of mineral dust particles and major ions deposited in snow is high,while the concentration is relatively low during the non-dust period of summer and *** may be caused by dust storm activity in central *** order of major ionic concentrations in the snow packs was determined to be Ca2+ > SO42-> NH4+ > NO3-> Cl-> Na+ > Mg2+ > K+.Ca2+ was the dominant cation;SO42- was the dominant *** find,with the exception of NO3-,that the variabilities of ionic concentrations are highly *** show that the glacier region was significantly affected by dust activity and anthropogenic *** major ions,especially Na+,originate from dust sources of central Asia and from the Ocean,transported by the westerly winds.

关键词： Snow chemistry Mineral dust Environmental significance Haxilegen glacier No. 51 Tian Shan

Synthesis of nano onion-like fullerenes by using Fe/Al_2O_3 as catalyst by chemical vapor deposition

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 2009年第1期54卷 137-141页

作者： LIU XuGuang1,2,WANG CunJing1,2,YANG YongZhen1,3,GUO XingMei1,2,WEN HaiRong1,2 & XU BingShe1,3 1 Key Laboratory of Interface Science and engineering in Advanced Materials,Ministry of Education,Taiyuan university of Tech-nology,Taiyuan 030024,china 2.college of chemistry and chemical engineering,Taiyuan university of Technology,Taiyuan 030024,china 3 college of Materials Science and engineering,Taiyuan university of Technology,Taiyuan 030024,china Key Laboratory of Interface Science and engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan 030024 China college of chemistry and chemical engineering Taiyuan University of Technology Taiyuan 030024 China college of Materials Science and engineering Taiyuan University of Technology Taiyuan 030024 China

Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400℃ by using Fe/Al2O3 as catalyst. The product was refluxed in 36% concentrated HCl at 60℃ for 48 h in order to re-move the catalyst support. The samples were examined by scanning and high resolution transmission electron microscopy,energy dispersive spectroscopy and X-ray diffraction. The results show that nano onion-like fullerenes encapsulating a Fe3C core were obtained. These had a structure of stacked graphitic fragments,with diameters ranging from 15―50 nm. When the product was further heat-treated at 1100℃ for 2 h,nano onion-like fullerenes with a clear concentric graphitic layer structure were obtained. The growth mechanism of nano onion-like fullerenes encapsulating metal cores is suggested to follow a vapor-solid growth model.

关键词：纳米碳材料化学蒸发沉积作用合成增长机制

Synthesis and Characterization of Polyurethane/Poly (Urethane Modified Bismaleimide-Bismaleimide) IPNs

在线全文

学校读者我要写书评

暂无评论

chinese chemical Letters 2000年第6期11卷 525-526页

作者： Yuan Li CAI Peng Sheng LIU (college of chemistry and chemical engineering, Xiangtan university, Hunan 411105) Xiangtan Univ Coll Chem & Chem Engn Xiangtan 411105 Peoples R China

PU/P(UBMI-BMI) IPNs with excellent thermal stability and mechanical properties were synthesized and characterized. The interpenetrating occurs in the hard segment domains of PU, which leads to enhancement of hydrogen ... 详细信息

关键词： PU/P(UBMI-BMI) IPNs synthesis characterization

Construction and characterization of the transformation-competent artificial chromosome (TAC) libraries of Leymus multicaulis

在线全文

学校读者我要写书评

暂无评论

Science china(Life sciences) 2008年第7期51卷 604-613页

作者： XU YueYu 1,2,3,ZHOU YuLei 4,5 ,SONG LinLin 6 ,ZHANG Yan 3 &ZHAO MaoLin 1 1 beijing Agro-Biotechnology Research Center,beijing academy of Agriculture and Forestry Science,beijing 100097,china 2 Department of chemistry and chemical engineering,Hunan Institute of engineering,Xiangtan 411104,china 3 college of Life Science,Capital Normal university,beijing 100037,china 4 college of Life Science,Zhongkai university of Agriculture and Technology,Guangzhou 510225,china 5 college of Grassland Science,Gansu Agricultural university,Lanzhou 730070,china 6 Department of Biology,Henan Institute of Science and Technology,Xinxiang 453003,china 1. beijing Agro-Biotechnology Research Center Beijing Academy of Agriculture and Forestry Science Beijing 100097 China 2. Department of chemistry and chemical engineering Hunan Institute of Engineering Xiangtan 411104 China 3. college of Life Science Capital Normal University Beijing 100037 China 4. college of Life Science Zhongkai University of Agriculture and Technology Guangzhou 510225 China 5. college of Grassland Science Gansu Agricultural University Lanzhou 730070 China 6. Department of Biology Henan Institute of Science and Technology Xinxiang 453003 China

Transformation-competent artificial chromosome system is able to clone and transfer genes efficiently in *** order to clone genes highly tolerant to barley yellow dwarf virus(BYDV),Aphids,drought and salt from Leymus multicaulis,the two TAC genomic libraries I and II were constructed in vector pYLTAC17 and pYLTAC747H/sacB,which contain about 165000 and 236000 recombinant clones *** genome coverage of the two libraries was totally estimated to be about 3―5 haploid genome equivalents,as size selection of genomic DNA fragments was approximately from 9 to 300 *** of the genomic libraries were collected as bulked pools each containing 500 clones or so,stored in twelve 96-deep-well plates and then were gridding in triplicate onto a high-density colony hybridization filter with a 3×3 pattern using a GeneTAC?G3 arraying robot after being transferred manually into three 384-well *** 2501 and 2890 clones of Library in pYLTAC17 and in pYLTAC747H/sacB were stored individually in fourteen 384-well plates and then were automatically gridding in duplicate onto a high-density colony hybridization filter with a 6×6 pattern after a replication of *** positive clones were detected by using the probe glutahione reductase gene of *** libraries constructed here can be used to isolate genomic clones containing target genes,and to carry out genome walking for positional *** the target TAC clones were isolated,they could be immediately transferred into plant genomes with the Agrobacterium system.

关键词： Leymus multicaulis megabase-size DNA transformation-competent artificial chromosome(TAC) genomic library

Synthesis and Crystal Structure of Bis(nitrate)- bis(N,N'-dimethyl-N,N'-dibenzenyl-urea)uranyl(Ⅱ)

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Structural chemistry 2003年第5期22卷 521-524页

作者： ZHU Li-Ming LI Bao-Long② CAO Zheng-Bai ZHANG Yong (college of chemistry and chemical engineering, Suzhou university, Suzhou 215006, china) college of chemistry and chemical engineering Suzhou University Suzhou 215006

The new uranyl complex UO2(NO3)2[PhN(CH3)C(O)(CH3)NPh]2 was synthesized and its crystal structure has been determined by single-crystal X-ray diffraction. Crystal data: C30H32N6O10U, triclinic, space group P with a = 7.772(1), b = 9.267(1), c = 12.644(1) ? a = 68.246(8), b = 73.871(9), g = 84.99(1)o, V = 812.4(2) ?, Mr = 874.65, Z = 1, Dc = 1.788 g/cm3, F(000) = 426, m = 5.062 mm-1, the final R = 0.022 and wR = 0.059 for 3571 observed reflections (I > 2s(I)). The central uranyl ion is coordinated by six oxygen atoms, two from the carbonyl groups of N,N-dimethyl-N,N-dibenzenyl-urea molecules and the other four from two nitrate groups.

关键词： substituted urea uranyl complex synthesis crystal structure

MORPHOLOGICAL TRANSITION BETWEEN VESICLES AND TUBULES FOR A GLYCOPOLYMER-CONTAINING AMPHIPHILIC DIBLOCK COPOLYMER IN AQUEOUS SOLUTIONS

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Polymer Science 2001年第3期19卷 297-301页

作者： Zi-chen Li Yue Shen Yu-zeng Liang Fu-mian Li Department of Polymer Science & engineering college of chemistry Peking university beijing 100871, china beijing Univ Coll Chem Dept Polymer Sci & Engn Beijing 100871 Peoples R China

The morphological transition of molecular assemblies in aqueous solutions for a new amphiphilic diblock copolymer induced by changing the initial solvent conditions was studied by transmission electron microscopy (TEM). The copolymer was polystyrene(77)-b-poly[2-(beta -D-glucopyranosyloxy)ethyl acrylate (6)] (PSt(77)-b-PGEA(6)) and the solvent was a mixture of DMF and THF. PSt(77)-b-PGEA(6) yields vesicles and tubules when it is initially dissolved in THF and DMF respectively. The morphological transition between vesicles and tubules can be achieved by simply varying the amounts of THF and DMF, or changing the temperature at which the aggregates were prepared.

关键词： block copolymer amphiphile glycopolymer self-assembly tubule vesicle

Six Specific Lysihe Residues are Crucial in Maintaining the Structure and Function of Soluble Manganese Stabilizing Protein

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2006年第9期 611-619页

作者： Jin-Peng GAO~(1,2#) Feng ZHANG~(1,3#) Li ZHANG~4 Yin-Long GUO~4 Kang-Cheng RUAN~5 De-An JIANG~3* Chun-He XU~1 1 Institute of Plant Physiology and Ecology,Shanghai Institutes for Biological sciences,chinese academy of sciences,Shanghai 200032,china 2 graduate School of the chinese academy of sciences,Shanghai 200032,china 3 college of Life sciences,Zhejiang university,Hangzhou 310029,china 4 Shanghai Mass Spectrometry Center,Shanghai Institute of Organic chemistry,chinese academy of sciences,Shanghai 200031,china 5 Laboratory of Proteomics,Institute of Biochemistry and Cell Biology,Shanghai Institutes for Biological sciences,chinese academy of sciences,Shanghai 200031,china

When manganese stabilizing protein （MSP） was treated with 0.5mM N-succinimidyl propionate（NSP）,the rebinding ability and oxygen-releasing capabilities of the modified MSP were not altered,in spiteof changes of MSP surface Lys ***,far-ultraviolet circular dichroism and intrinsicfluorescence spectra analysis revealed that 0.5 mM NSP-modified MSP retained most of its native secondaryand tertiary *** of the sites of NSP modification by Staphylococcus V8protease digestion ofthe modified protein,as well as analysis by matrix-assisted laser desorption ionization-time of flight massspectrometry,indicated that seven Lys residues were *** results suggested that these residues arenot absolutely essential to the structure and function of ***,when the NSP concentration wasincreased to 4mM,the modified MSP was unable to bind photosystem Ⅱ and completely lost its *** far-ultraviolet circular dichroism and intrinsic fluorescence spectra analysis revealed a clearconformational change in MSP after 4 mM NSP treatment,suggesting that some Lys residues are involved inmaintaining the structure and function of *** by matrix-assisted laser desorption ionization-timeof flight mass spectrometry indicated that another six Lys residues,namely Lys20,Lys101,Lys196,Lys207,Lys130 （or Lys137） and Lys66 （or Lys76）,were modified by 4 mM ***,these six Lys residuesare crucial in maintaining the structure and function of soluble MSP.

关键词： chemical modification fluorescence spectrum circular dichroism spectrum manganese stabilizing protein Lys residue

New numerical algorithms in SUPER CE/SE and their applications in explosion mechanics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 237-243页

作者： WANG Gang1,2,WANG JingTao1 & LIU KaiXin1,3 1 LTCS and college of engineering,Peking university,beijing 100871,china 2 LHD,Institute of Mechanics,chinese academy of sciences,beijing 100190,china 3 Center for Applied Physics and Technology,Peking university,beijing 100871,china 1. LTCS and college of engineering Peking University Beijing 100871 China2. LHD Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China3. Center for Applied Physics and Technology Peking University Beijing 100871 China

The new numerical algorithms in SUPER/CESE and their applications in explosion mechanics are studied. The researched al-gorithms and models include an improved CE/SE (space-time Conservation Element and Solution Element) method,a local hybrid particle level set method,three chemical reaction models and a two-fluid model. Problems of shock wave reflection over wedges,explosive welding,cellular structure of gaseous detonations and two-phase detonations in the gas-droplet system are simulated by using the above-mentioned algorithms and models. The numerical results reveal that the adopted algorithms have many advantages such as high numerical accuracy,wide application field and good compatibility. The numerical algo-rithms presented in this paper may be applied to the numerical research of explosion mechanics.

关键词： new algorithm SUPER CE/SE numerical simulation explosion mechanics

同方期刊数据库