检索结果-南通市图书馆

Laser Direct Metal Deposition Technology and Microstructure and Composition Segregation of Inconel 718 Superalloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第4期18卷 73-78页

作者： zhang qun-li YAO Jian-hua Jyoti Mazurnder Key Laboratory of E and M of Ministry of Education and Zhejiang Province Hangzhou 310014 Zhejiang China Research Center of Laser Processing Technology and Engineering Zhejiang University of Technology Hangzhou 310014 Zhejiang China Center for Laser Aided Intelligent Manufacturing University of Michigan Ann Arbor 48109 Michigan USA

Multilayer of laser direct metal deposition（DMD）was prepared by depositing a gas atomized pre-alloyed powder with a composition close to Inconel 718 alloy on Inconel 718 high temperature alloy *** effects of the DMD parameters on the build-up rate and the structure of the deposited layer were *** laser DMD sample was further processed by a solution *** microstructure and property of the laser DMD zone before and after heat treatment were investigated as *** results show that the laser parameters of actual laser power of 650 W,scanning speed of 5.8 mm/s,beam diameter of 1 mm,powder feed rate of 6.45 g/min,with a corresponding specific energy of 90-130 J/mm2,can be recommended as optimum parameters for high build-up rate of Inconel 718 *** the condition of optimized parameters,a directional solidification microstructure was obtained and the average distance between the columnar crystals was 5-10 μ*** microcomposition segregation was found between the columnar crystal trunk and columnar *** elements of Nb,Mo,Ti concentrated in the columnar crystal *** the heat treatment,the segregation was greatly minimized,and the segregation ratios were close to *** hardness of the laser deposited layer did not show obvious difference along the height of the layer either for the as-deposited layer or for the heat treated ***,the microhardness of the laser DMD zone after heat treatment was obviously higher than that after the as-deposited *** the heat treatment process,some Nb-and Mo-rich phases precipitated and strengthened DMD layer.

关键词： laser DMD Inconel 718 alloy composition segregation microstructure hardness

Efficient and Eco-friendly Process for the Synthesis of Bi(indolyl)methanes Catalyzed by Sodium Hydrogensulfate Monohydrate in Ionic liquid n-Butylpyridinium Tetrafluoroborate

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第6期17卷 723-726页

作者： li Ping zhang Yi qun li Mei Yun ZHOU Department of Chemistry Jinan University Guangzhou 510632

Efficient electrophilic substitution reaction of indoles with various aromatic aldehydes were carried out with a catalytic amount of sodium hydrogensulfate monohydrate （NaHSO4·H20） in ionic liquid n-butylpyridinium tetrafluoroborate （[Bpy]BF4） to afford the corresponding bi（indolyl）methanes in excellent yields. The notable advantages of this protocol in terms of low cost of catalyst and ionic liquid, mild conditions, simple operation, short reaction time, high yields and recycling of the ionic liquid.

关键词： Bi(indolyl)methane ionic liquid sodium hydrogen sulfate.

Arabidopsis Galacturonosyltransferase （GAUT） 13 and GAUT14 Have Redundant Functions in Pollen Tube Growth

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2013年第4期6卷 1131-1148页

作者： li Wang Wei Wang You-qun Wang Yang-Yang liu Jing-Xin Wang Xue-Qin zhang De Ye li-qun Chen State Key Laboratory of Plant Physiology and Biochemistry College of Biological Sciences China Agricultural University Beijing 100193 China

Cell wall biosynthesis is indispensable for pollen tube growth. Despite its importance to sexual reproduction, the molecular mechanisms of pollen tube wall biosynthesis remain poorly understood. Here, we report functional characterization of two putative Arabidopsis galacturonosyltransferase genes, GAUT13 and GAUT14, which are essential for pollen tube growth. GAUT13 and GAUT14 encode the proteins that share a high amino acid sequence identity and are located in the Golgi apparatus. The T-DNA insertion mutants, gaut13 and gaut14, did not exhibit any observable defects, but the gaut13 gaut14 double mutants were defective in pollen tube growth; 35.2-37.3% pollen tubes in the heterozygous double mutants were swollen and defective in elongation. The outer layer of the cell wall did not appear distinctly fibrillar in the double mutant pollen tubes. Furthermore, distribution of homogalacturonan labeled with JIM5 and JIM7 in the double mutant pollen tube wall was significantly altered compared to wild-type. Our results suggest that GAUT13 and GAUT14 function redundantly in pollen tube growth, possibly through participation in pectin biosynthesis of the pollen tube wall.

关键词： Arabidopsis cell wall GAUT13 GAUT14 pectin pollen tube.

Hydrothermal Synthesis of Nanorods and Nanowires of Mg/Al Layered Double Hydroxides

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第5期23卷 622-624页

作者： ZHAO Yun JIAO Qing-ze DING Xue-jia zhang li-qun liU Yuan-yuan School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100051 P. R. China Key Laboratory of Beifing City on Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Beijing 100029 P. R. China

Layered double hydroxides（LDHs） are a class of synthetic anion clays, characterized by the formula [MⅡ1-xMⅢx（OH）2]x＋（An-）x/n5yH2O（where M=metal and A=anion, usually carbonate）[1-3]. A large number of LDHs with a wide variety of MⅡ-MⅢ cation pairs including MⅠ-MⅢ（e.g., li-Al） and MⅡ-MⅣ（e.g., Co-Ti） have been reported. Thus the identities of the cations（MⅠ, MⅡ, MⅢ and MⅣ） and the interlayer anion（An-） together with the value of the stoichiometric coefficient（x） may vary widely, giving rise to a large class of isostructural materials. As a result,

关键词： Nanorod Nanowire Layered double hydroxide Hydrothermal synthesis

Numerical Study of Thermal Performance of Phase Change Material Energy Storage Floor in Solar Water Heating System

在线全文

学校读者我要写书评

暂无评论

湖南大学学报（自然科学版） 2009年第S1期36卷 141-145页

作者： ZENG Ruo-lang,WANG Xin,zhang Yin-ping,DI Hong-fa,zhang qun-li(Department of Building Science,Tsinghua University,Beijing 100084,China) Department of Building Science Tsinghua University Beijing 100084 China

The conventional solar heating floor system contains a big water tank to store energy in the day time for heating at night,which takes much building space and is very *** order to reduce the water tank volume even to cancel the tank,a novel structure of integrated water pipe floor heating system using shape-stabilized phase change materials(SSPCM)for thermal energy storage was developed.A numerical model was developed to analyze the performance of SSPCM floor heating system under the intermittent heating condition,which was verified by our experimental *** thermal performance of the heating system and the effects of various factors on it were analyzed *** factors including phase transition temperature,heat of fusion,thermal conductivity of SSPCM and thermal conductivity of the decoration material were *** results show that tm and kd are the most import influencing factors on the thermal performance of SSPCM floor heating system,since they determine the heat source temperature and thermal resistance between SSPCM plates and indoor air,*** should be large to store enough thermal energy in the day time for nighttimes *** effects of kp can be ignored in this *** SSPCM floor heating system has potential of making use of the daytime solar energy for heating at night efficiently in various climates when its structure is properly designed.

关键词： phase change material energy storage solar water heating

Synthesis and Immunosuppressive Activity of New Amino Alcohol Derivatives(Ⅰ)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第4期27卷 614-618页

作者： MI Hao-yu CUI lin-lin zhang qun-li li Fang JIANG Tao liANG Yong-tao WANG En-si College of life Science Jilin University Changchun 130012 R R. China School of Pharmacy Jilin University Changchun 130021 P. R. China

A series of new amino alcohol derivatives was synthesized and evaluated for their immunosuppressive activity on mouse peripheral blood *** structures were confirmed by means of 1H NMR,13C NMR,IR and *** of the compounds display moderate to potent inhibitory *** 9d shows the most activity among them that are expected as a powerful candidate for safer immunosuppressant for organ transplantations and the treatment of autoimmune diseases.

关键词： Immunosuppressant Amino alcohol derivative Bucherer-Bergs reaction

Transferring CdTe Nanoparticles from liquid Phase to Polyvinylpyrrolidone Nanofibers by Electrospinning and Detecting Its Photoluminescence Property

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第4期24卷 459-463页

作者： WANG Shu-gang YANG Qing-biao BAI Jie SONG Yan zhang Chao-qun li Yao-xian Department of Organic Chemistry College of Chemistry Jilin University Changchun 130021 P R. China

The major aim of this work was to synthesize thio-stabilized CdTe nanoparticles（NPs） in an aqueous solution, which was then enwrapped with cetyltrimethylammonium bromide（CTAB）, and finally transferred to the polyvinylpyrrolidone（PVP） matrix by electrospinning. The PVP nanofibers containing CdTe NPs were characterized by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）, to observe the morphology of the nanofibers and the distribution of CdTe NPs. The selective area electronic diffraction（SAED） pattern verified that CdTe NPs were cubic lattice. The photoluminescence（PL） spectrum indicated that CdTe NPs existed in an optical style in PVP nanofibers. Moreover, X-ray photoelectron spectra（XPS） revealed that thiol-stabilized CdTe NPs were enwrapped by CTAB, and PVP acted as a dispersant in the process of electrospinning.

关键词： CTAB Electrospinning Nanofiber Nanoparticle Photoluminescence

Synthesis and Immunosuppressive Activity of New Amino Alcohols Derivatives(II)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第5期27卷 808-812页

作者： CUI lin-lin MI Hao-yu zhang qun-li WANG Wei-wei YANG li-juan liANG Yong-tao WANG En-si College of life Science Jilin University Changchun 130012 t~ R. China College of Pharmacy Jilin University Changchun 130021 P. R. China

A series of new amino alcohols derivatives was synthesized with 6-bromo-2-tetralone as starting material, 6-substituted-2-tetralone as intermediate and Ullmann reaction, Suzuki reaction and spiro-hydantoin hydrolysis as key steps. The structures of key intermediate and target compounds were confirmed by 1H NMR, 13C NMR, IR and MS. Bioactivity researches show that the target compounds have certain inhibition effects on mice peripheral blood lymphocytes.

关键词： Immunosuppressant Amino alcohol derivative Bioactivity Buchere-Bergs reaction

A special type of endovascular stent repair with complicated thoracic aneurysm and chronic type B dissection aligned in tandem： double perfusion in true and false distal aorta lumen

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2008年第15期121卷 1484-1486页

作者： GAN Hui-li zhang Jian-qun Cardiac Surgery Department Beijing Anzhen Hospital Capital Medical University Beijing Institute of Heart Lung and Blood Vessel Disease Beijing 100029 China

Aortic dissection and aortic aneurysm are two of the most common catastrophic events involving the aorta. Thoracic endovascular aortic repair is now considered as a promising alternative to open surgical graft replacement. The aim of endovascular repair of a thoracic aneurysm is to exclude, and thus depressurize, the aneurismal wall and the aim of the endovascular repair of type B aortic dissection is to obliterate all of the false lumen through thrombosis after sealing the primary entry tears, thus to ensure the true lumen perfusion. But in some special pathologies, such as when the aneurysm and chronic type B dissection are aligned in tandem, or when a visceral branch originates from the false lumen, how should the endovascular repair strategy proceed in this situation？ For the endovascular stent repair of some special chronic type B aortic dissection, the false lumen cannot be obliterated, and the true and false lumens in the dissected but with a normal diameter distal aorta need to be perfused at the same time, as practiced in the surgery treatment. In this report, we present a case of endovascular stent repair for a special thoracic aneurysm and chronic type B aortic dissection aligned in tandem.

关键词： aortic aneurysm aortic dissection stent