检索结果-南通市图书馆

Mechanical Property and Microstructural Characterization of C-Mn-Al-Si Hot Dip Galvanizing TRIP Steel

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 Iron and Steel Research International 2012年第8期19卷 29-36页

作者： JIANG Hai-tao1, DING Wei1,2, TANG Di1, HUANG Wei1 (1. National Engineering Research Center for Advanced Rolling Technology, university of Science and Technology beijing, beijing 100083.{3. 2. School of Material and Metallurgy, Inner Mongolia university of Science and Technology, Baotou 014010, Inner Mongolia,{3.) [a] National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China [b] School of Material and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China

Mechanical properties and microstructure in high strength hot dip galvanizing TRIP steel were investigated by optical microscope (OM), transmission electron microscope (TEM), X-ray diffraction (XRD), dilatometry and mechanical testing. On the heat treatment process of different intercritical annealing (IA) temperatures, isothermal bainitic transformation (IBT) temperatures and IBT time, this steel shows excellent mechanical properties with tensile strength over 780 MPa and elongation more than 22%. IBT time is a crucial factor in determining the mechanical properties as it confirms the bainite transformation process, as well as the microstructure of the steel. The microstructure of the hot dip galvanizing TRIP steel consisted of ferrite, bainite, retained austenite and martensite during the short IBT time. The contents of ferrite, bainite, retained austenite and martensite with different IBT time were calculated. The results showed that when IBT time increased from 20 to 60 s, the volume of bainite increased from 14.3.% to 16.95% and the volume of retained austenite increased from 13.64% to 16.28%; meanwhile, the volume of martensite decreased from 7.18% to 1.89%. Both the transformation induced plasticity of retained austenite and the hardening of martensite are effective, especially, the latter plays a dominant role in the steel containing 7.18% martensite which shows similar strength characteristics as dual-phase steel, but a better elongation. When martensite volume decreases to 1.89%, the steel shows typical mechanical properties of TRIP, as so small amount of martensite has no obvious effect on the mechanical properties.

关键词： TRIP steel isothermal bainitic transformation martensite mechanical property

Proteomics in china:Ready for prime time

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2010年第1期53卷 22-33页

作者： GAO Xue1,ZHANG XueLi1,ZHENG JunJie1 & HE FuChu1,2 1 State Key Laboratory of Proteomics,beijing Proteome Research Center,beijing Institute of Radiation Medicine,beijing 102206,{3. 2 Institutes of Biomedical Sciences,Fudan university,Shanghai 20003.,{3. 1. State Key Laboratory of Proteomics Beijing Proteome Research Center Beijing Institute of Radiation Medicine Beijing 102206 China2. Institutes of Biomedical Sciences Fudan University Shanghai 200032 China

Proteomics is a newborn science focusing on the comprehensive systematic analysis of all proteins in molecule machineries,organelles,cells,tissues,organs or intact *** has been becoming one of the focuses in life sciences and cutting-edge techniques in biotechnologies in the 21st *** the last decade,proteomics in china has developed much faster than other developing fields in the life *** review article briefly retrospects the origin and development of proteomics in china,and provides an overview of representative scientific progress and perspectives.

关键词： proteomics progress china Human Proteome Organization Human Liver Proteome Project perspectives

杜仲抗真菌蛋白晶体生长的原子力显微成像研究——快速生长与晶面生长速率

在线全文

学校读者我要写书评

暂无评论

生物化学与生物物理进展 2003年第5期30卷 784-791页

作者：汪盛向烨李根培王大成中国科学院生物物理研究所分子生物学研究中心北京100101 中国科学院力学研究所国家微重力实验室北京100080 重庆大学生物工程学院重庆400044

杜仲抗真菌蛋白(Eucommiaantifungalprotein,EAFP)的单晶体具有在几小时内就可长大的快速生长特性.用原子力显微成像(atomicforcemicroscope,AFM)技术,原位实时观测了EAFP单斜晶体生长过程中的｛10 0｝表面形貌动态变化,并分别在不同的... 详细信息

杜仲抗真菌蛋白(Eucommiaantifungalprotein,EAFP)的单晶体具有在几小时内就可长大的快速生长特性.用原子力显微成像(atomicforcemicroscope,AFM)技术,原位实时观测了EAFP单斜晶体生长过程中的｛10 0｝表面形貌动态变化,并分别在不同的过饱和度下测量了其生长速率.结果表明,EAFP晶体生长的速率与蛋白质溶液的过饱和度相关,在过饱和度高时(σ =1 78)晶面生长极快;在中等过饱和度(σ =1 5)下,其晶面台阶的生长速率沿b,c方向分别为 12nm/s和 2 4 2nm/s,比溶菌酶生长速率(6～ 7nm/s)快很多;在蛋白质浓度很低的情况下,其生长速率仍与其他蛋白质相当.EAFP晶体快速生长可能与该分子尺寸较小,内部结构紧凑,分子骨架呈刚性和分子表面性质等其固有特性密切相关.沉淀剂浓度对EAFP晶体生长也有影响.过饱和度很低时,提高沉淀剂浓度会干扰晶体生长.

关键词：杜仲抗真菌蛋白晶体生长原子力显微成像晶面生长速率

Effect of Heat Treatment on Structure and Electrochemical Properties of Electro-deposited Ni-P Amorphous Alloy

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5B期25卷 1163-1165页

作者： GUOJin-biao WANGYu LIHui-qin SUNDong-bai beijinguniversityofScienceandTechnology Beijing.China

The influences of heat treatment time on structure and the electrochemical behavior of electro-deposited amorphous Ni-P alloy coating were studied. The results show that the as-plated deposits have an amorphous structure, and the deposits crystallize into Ni12P5 and Ni3. at 260 °C, and the corrosion resistance of the as-plated deposits are better than that of the deposits after heat treatment.

关键词：热处理 Ni-P非晶形合金电化学电解沉积

Genetic variation of Chinese and Japanese wild Pacific abalone(Haliotis discus hannai)measured by microsatellite DNA markers

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2006年第4期25卷 146-155页

作者： LI Qi KIJIMA Akihiro Key Laboratory of Mariculture of the Ministry of Education Ocean University of China Qingdao 266003 China graduate School of Agricultural Science Tohoku University Sendai 981 - 8555 Japan

Population differentiation and relationships among three wild populations of the Pacific abalone Haliotis discus hannai collected from coastal seas around china and Japan were estimated using microsatellite DNA analysis. The results obtained with six microsatellite loci showed a high genetic diversity for china and Japan populations. The mean number of alleles per locus ranged from 11.7 to 23.0, and the average of observed and expected heterozygosity ranged from 0. 656 to 0. 721, and from 0. 721 to 0. 793. respectively. The observed genotype frequencies at each locus were mostly in agreement with Hardy - Weinberg expectations with five exceptions. Significant differences were detected between Chinese and Japanese H. discus hannai populations [ Weir and Cocker-ham＇ s fixation index（ Fst ） range ： 0. 020～ 0.023.; Slatkin＇ s fixation index （Rst） range： 0. 016～ 0. 044 ], and no obvious difference was detected between the samples of Japanese H. discus hannm populations （ Fst = 0. 002 ; Rst = 0. 007）. The level of differentiation among populations is further evidenced by the nNeighbor-joining tree topology on which the Japanese samples were closely clustered, and the Chinese population formed a separate cluster. These results suggest that care should be taken in future management of different populations.

关键词： Haliotis discus hannai genetic variation microsatellite DNA

Chloroplast Genomes:Origin and Evolution of Allotetraploids

在线全文

学校读者我要写书评

暂无评论

Chloroplast Genomes:Origin and Evolution of Allotetraploids

Coupled modeling of tumour angiogenesis, tumour growth,and blood perfusion

第十二届全国植物基因组学大会

作者： Qin Xu~1,Pengbo Li~(1,2),Fei He~3.Jinping Hua~(1*) 1.College of Agronomy & Biotechnology,china Agricultural university,beijing 100193.china 2.Institute of Cotton,Shanxi Academy of Agricultural Sciences,Yuncheng 44000,china 3.College of Biological Sciences,china Agricultural university, beijing 100193.china

For evaluation of the phylogenetic relationship of Gossypium allotetraploids,we present the complete sequences of 12 Gossypium chloroplast genomes,including 2 A-genome lineages,2 D-genome lineages,and 8 allotetraploid *** genome size varied from 159,959 bp to 160,43. *** chromosomes shared nearly identical sequences with>98%*** encoded a same set of 112 unique genes in a uniform order.A 5-bp indel,genus-specific preference,was identified between Gossypium chloroplast genomes.A 23.-bp deletion was detected in trnL-UAG/rp13. of *** rps19 extended into IR region

关键词：

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

Theoretical & Applied Mechanics Letters 2011年第4期1卷 80-82页

作者： Y.Cai,1,2 S.X.Xu,1,a) J.Wu,3.and Q.Long 2,b) 1) Department of Mechanics and Engineering Science,Fudan university,Shanghai 20043.,china 2) Brunel Institute for Bioengineering,School of Engineering and Design,Brunel university,Uxbridge,Middlesex,UK 3. School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong university,Shanghai 200240,china School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200240 China

This paper proposes a more realistic mathematical simulation method to investigate the dynamic process of tumour angio-genesis by fully coupling the vessel growth,tumour growth and associated blood *** tumour growth and angiogenesis are coupled by the chemical microenvironment and the cell-matrix *** haemodynamic calculation is carried out on the new vasculature,and an estimation of vessel collapse is made according to the wall shear stress *** results are consistent with physiological observations,and further confirm the application of the coupled model feedback *** model is available to examine the interactions between angiogenesis and tumour growth,to study the change in the dynamic process of chemical environment and the vessel remodeling.

关键词： tumour growth angiogenesis coupled model mathematical modeling

Low-Dose Tamsulosin Improves Clinical Effect Of Single Extracorporeal Shock Wave Lithotripsy For Ureteral Calculi

在线全文

学校读者我要写书评

暂无评论

Low-Dose Tamsulosin Improves Clinical Effect Of Single Extra...

第十五届全国泌尿外科学术会议

作者： Liu Yuqing, Zhuang shenrong, Ma lulin Department of Urology, 3.d Hospital of Peking university, beijing 100083. china

Objective. To evaluate the efficiency and safety of a short-term low-dose tamsulosin treatment for ureteral calculi after single extracorporeal shock wave lithotripsy (ESWL). Methods. A 2-week-period randomized and controlled clinical trial was conducted in 108 patients with single ureteral calculi, who accepted ESWL as the initial interventional therapy. After ESWL, the patients in Group 1 (controls, n=55) received conservative therapy, such as hydration, antibiotics and acetaminophen on demand. But in Group 2 (n=53., patients received tamsulosin (0.2mg daily) in addition to conservative therapy. All patients were questioned about the number and intensity of post-discharge pain and evaluated by plain abdominal radiography at the end of the follow-up. Results. The rate of calculi clearance in the Group 2 (84.91%, 45/53. was higher than that Group 1 (65.45%, 3./55) (P=0.020), evidently for the larger (≥10mm) calculi (83.3.%, 20/24 versus 48.48%, 16/3.) (P=0.007) and the proximal ones (86.67%, 26/3. versus 62.16%, 23.3.) (P=0.024). Moreover, Group 1 reported higher mean visual analog scores of colic intensity (3.11±2.60) than Group 2 did (1.98±2.08) (P=0.015). And 3..3.% (20/55) patients in Group 1 used acetaminophen to reduce post-discharge pain, higher than that of Group 2 (18.87%, 10/53. (P=0.042). No side effects of tamsulosin were observed in either group. Conclusion. The addition of low-dose tamsulosin after single ESWL can enhance the clearance of ureteral calculi successfully in a 2-week term, evidently for those larger and proximal ones, and reduce the intensity of post-discharge pain, with low risk of side effects.

关键词： Adrenergic alpha-antagonists ureteral calculi lithotripsy

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

COSMIC PLASMA DYNAMO

空间科学学报 2002年第4期22卷 289-299页

作者： YANG Zhiliang(Astronomy Department, beijing Normal university, beijing 100875) AstronomyDepartment BeijingNormalUniversity 北京 100875

A new dynamo model based on the polarization of plasma is presented in this *** the Maxwell equations in a moving medium, a magnetization vector can be causedwith Rongon current. The steady solar magnetic field is solved from the equations. Onthe assumption that the meridianal flow is ignored, the distribution of magnetic field isput out. In the model, there is no additional parameter considered. The intensity ofmagnetic field inside the sun ranges from 1-6T. The surface magnetic field around thepole is in the order of 1×10-3., at low latitude the calculated surface magnetic fieldhas the order of 1×10-2 T. The maximum magnetic field is around 3.° in latitude.

关键词：太阳风发动机模型等离子体磁场强度