检索结果-南通市图书馆

Journal of Iron and Steel Research International 2011年第3期18卷 59-64页

作者： zhou min du lin-xiu liu xiang-hua State Key Laboratory of Rolling Technology and Automation Northeastern UniversityShenyang 110004LiaoningChina

The variation of heat treatments including directed quenching and tempering off-line after controlled rolling（DQT） and quenching off-line and tempering off-line after controlled rolling（RQT） with microstructure and mechanical properties of a low-carbon microalloyed steel was compared and *** DQT,the quenched steel was obviously banded microstructure,with increasing tempering temperature,lath martensite coarsened,the cusp carbide precipitated at grain boundaries,the yield strength fluctuated slightly,and the fracture-separation was *** impact toughness was better in the steel tempered at 500 ℃ for 1 *** RQT,with increasing tempering temperature,lath martensite degenerated,intragranular and intergranular finer precipitations with smaller than 30 nm precipitated and grew up and were distributed dispersedly,the stripe-like carbides were distributed at grain boundaries,and the yield strength and tensile strengthen decreased *** impact toughness of RQT process was much better than that of DQT process,and the comprehensive mechanical properties were better for the steel tempered at 500 ℃ for 1 h of RQT process.

关键词： X120 pipeline steel heat treatment microstructure mechanical property fracture-separation

Effect of Ti(C,N)Precipitation on Texture Evolution and Fish-Scale Resistance of Ultra-Low Carbon Ti-Bearing Enamel Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第4期20卷 39-45页

作者： DONG Fu-tao du lin-xiu liu xiang-hua HU Jun XUE Fei State Key Laboratory of Rolling and Automation Northeastern University College of Electrical Engineering Hebei United University

The Ti（C,N）precipitation and texture evolution in ultra-low carbon Ti-bearing enamel steel were studied to discover their *** different cooling paths of simulative coiling were adopted to gain different morphologies of Ti（C,N）precipitate in hot *** is found that the Ti（C,N）precipitate in hot strip using Path 2（put into asbestos box and air cooled）are finer and much more in quantity than that in hot strip using Path 1（held at 730℃ for 30min and furnace cooled）.The morphology of Ti（C,N）precipitate in hot strip has great effect on recrystallization texture in the subsequent cold-rolled annealed sheet.γ-fiber texture of strong recrystallization is gained in coldrolled and annealed sheet came from Path *** the contrary,in the one came from Path 2,theγ-fiber texture is *** may be due to the pinning force of numerous fine Ti（C,N）precipitate which retard the growth of preferential nucleated{111}orientated *** steel sheets in the test came from both paths have excellent fishscale resistance.

关键词： Ti(C N)precipitate texture fish-scale resistance ultra-low carbon enamel steel hydrogen diffusion coefficient

Non-Oriented Fe-Si Thin Strip Produced from Grain Oriented Fe-Si Strip by CSR

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2004年第4期11卷 34-37页

作者： YE He-zhou QI Ke-min GAO xiu-hua QIU Chun-lin liu En Northeastern University

The grain oriented silicon strip was rolled by cross shear rolling(CSR)and then annealed to manufacture non-oriented thin silicon strip of high *** recrystallization of rolled grain-oriented silicon steel into non-oriented silicon steel was *** this purpose,CSR is better than conventional rolling,and the higher the mismatched speed rate is,the better the properties of the non-oriented thin silicon strip *** optimum annealing schedule is heating at 1 000 ℃for 1hin pure hydrogen atmosphere added with H2 S of 0.001 0 %.

关键词： grain oriented silicon strip non-oriented silicon strip cross shear rolling recrystallization texture

A Low Voltage Driven Digital-Droplet-Transporting-Chip by Electrostatic Force

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第8期28卷 179-182页

作者： GAO An-Ran liu xiang GAO xiu-Li LI Tie GAO hua-min zhou Ping WANG Yue-lin State Key Laboratories of Transducer Technology National Key Laboratory of Microsystem TechnologyShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050 Graduate School of Chinese Academy of Sciences Beijing 100049

A low-voltage-driven digital-droplet-transporting chip with an open structure is designed,fabricated and *** digital microfluidic chip is fabricated by the silicon planar *** only a single electrode panel,the droplet on the chip can be manipulated by electrostatic force under a dc driving *** actuation principle is proposed and verified by the *** experimental results show that the minimum driving voltage decreases as the thickness of the dielectric layer *** driving voltage for a 3µL deionized(DI)water droplet is reduced to 15 V in air and 13.5 V in oil by employing a thin dielectric layer of 600 nm with a high dielectric constant and a coating hydrophobic layer on the *** DI water droplets are also demonstrated to be transported in two dimensions smoothly in a programmable manner,and the maximum transport speed reaches 96 mm/*** droplets of normal saline,a solution of 0.9 wt%NaCl,are also successfully manipulated on the chip.

关键词： process coating driving

Application of Artificial Neural Network to Predicting Hardenability of Gear Steel

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 2006年第6期13卷 71-73页

作者： GAO xiu-hua QI Ke-min DENG Tian-yong QIU Chun-lin zhou Ping du Xian-bin State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Technical Center Laiwu Iron and Steel Co Ltd Laiwu 271104 Shandong China

The prediction of the hardenability and chemical composition of gear steel was studied using artificial neural networks. A software was used to quantitatively forecast the hardenability by its chemical composition or the chemical composition by its hardenability. The prediction result is more precise than that obtained from the traditional method based on the simple mathematical regression model.

关键词： artificial neural network (ANN) gear steel hardenability 20CrMnTiH

Stapled transperineal repair for low-and mid-level rectovaginal fistulas:A 5-year experience and comparison with sutured repair

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第14期27卷 1451-1464页

作者： Qian zhou Zhi-min liu hua-Xian Chen Dong-lin Ren Hong-Cheng lin Department of Coloproctology The Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510655Guangdong ProvinceChina Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases The Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510655Guangdong ProvinceChina Guangdong Institute of Gastroenterology The Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510655Guangdong ProvinceChina

BACKGROUND Currently,rectovaginal fistula(RVF)continues to be a surgical challenge worldwide,with a relatively low healing *** intermittent suture and poor suture materials may be the main reasons for *** To evaluate the efficacy and safety of stapled transperineal repair in treating *** This was a retrospective cohort study conducted in the Coloproctology Department of The Sixth Affiliated Hospital of Sun Yat-sen University(Guangzhou,China).Adult patients presenting with RVF who were surgically managed by perineal repair between May 2015 and May 2020 were *** the 82 total patients,37 underwent repair with direct suturing and 45 underwent repair with *** demographic data,Wexner faecal incontinence score,and operative data were *** rate and associated risk factors were *** The direct suture and stapled repair groups showed similar clinical characteristics for aetiology,surgical history,fistula features,and perioperative Wexner *** stapled repair group did not show superior results over the suture repair group in regard to operative time,blood loss,and hospital ***,the stapled repair group showed better postoperative Wexner score(1.04±1.89 vs 2.73±3.75,P=0.021),less intercourse pain(1/45 vs 17/37,P=0.045),and lower recurrence rate(6/45 vs 17/37,P=0.001).There was no protective effect from previous repair history,smaller diameter of fistula(10)were risk factors for fistula ***,stapled repair gave better efficacy in treating complex RVFs(i.e.,multiple transperineal repair history,mid-level fistula position,and poor control of defecation).CONCLUSION Stapled transperineal repair is advantageous for management of RVF,providing a high primary healing rate and low recurrence rate.

关键词： Rectovaginal fistula Surgical repair Transperineal approach Stapled technique Recurrence

Development of a humanized HLA-A30 transgenic mouse model

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

Animal Models and Experimental Medicine 2022年第4期5卷 350-361页

作者： Meng-min Zhu Bo-wen Niu ling-ling liu hua Yang Bo-yin Qin xiu-hua Peng Li-xiang Chen Yang liu Chao Wang Xiao-nan Ren Chun-hua Xu Xiao-hui zhou Feng Li Department of Laboratory Animal Science Shanghai Public Health Clinical CenterShanghaiChina

Background:There are remarkable genetic differences between animal major histocompatibility complex(MHC)systems and the human leukocyte antigen(HLA)*** transgenic humanized mouse model systems offer a much better method to study the HLA-A-related principal mechanisms for vaccine development and HLA-Arestricted responses against infection in ***:A recombinant gene encoding the chimeric HLA-A30 monochain was *** HHD molecule contains the following:α1-α2 domains of HLA-A30,α3 and cytoplasmic domains of H-2D~b,linked at its N-terminus to the C-terminus of humanβ2m by a 15-amino-acid peptide *** recombinant gene encoding the chimeric HLA-A30 monochain cassette was introduced into bacterial artificial chromosome(BAC)CH502-67J3 containing the HLA-A01 gene locus by Red-mediated homologous *** BAC CH502-67J3 was microinjected into the pronuclei of wild-type mouse *** humanized mouse model was further used to assess the immune responses against influenza A virus(H1N1)pdm09 clinically isolated from human *** cell population,cytokine production,and histopathology in the lung were ***:We describe a novel humanβ2m-HLA-A30(α1α2)-H-2D~b(α3 transmembrane cytoplasmic)(HHD)monochain transgenic mouse strain,which contains the intact HLA-A01 gene locus including 49 kb 5’-UTR and 74 kb 3’-UTR of HLA-A01**** transgenic lines integrated into the large genomic region of HLA-A gene locus were obtained,and the robust expression of exogenous transgene was detected in various tissues from A30-18#and A30-19#lines encompassing the intact flanking *** cytometry revealed that the introduction of a large genomic region in HLA-A gene locus can influence the immune cell constitution in humanized ***09 infection caused a similar immune response among HLA-A30 Tg humanized mice and wild-type mice,and induced the rapid increase of cytokines,including IFN-γ,TNF-α,and IL-6,in both HLA-A30 humanized

关键词： HLA-A30 humanized mouse immunology major histocompatibility complex(MHC)

Engineering a New Chloroplastic Photorespiratory Bypass to In crease Photosynthetic Efficiency and Productivity in Rice

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2019年第2期12卷 199-214页

作者： Bo-Ran Shen Li-min Wang xiu-ling lin Zhen Yao hua-Wei Xu Cheng-hua Zhu Hai-Yan Teng Li-Li Cui E.-E. liu Jian-Jun Zhang Zheng-Hui He Xin-xiang Peng State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources College of Life Sciences South China Agricultural University Guangzhou 510642 China College of Agricultural Henan University of Science and Technology Luoyang Henan China Departme nt of Biology San Fran cisco State University San Fran cisco CA USA These authors contributed equally to this article.

Over the past few years, three photorespiratory bypasses have been introduced into plants, two of which led to observable in creases in photos yn thesis and biomass yield. However, most of the experiments were carried out using Arabidopsis under controlled environmental conditions, and the increases were only observed under low-light and short-day conditions. In this study, we designed a new photorespiratory bypass (called GOC bypass), characterized by no reducing equivalents being produced during a complete oxidation of glycolate into CO2 catalyzed by three rice-self-originating enzymes, i.e., glycolate oxidase, oxalate oxidase, and catalase. We successfully established this bypass in rice chloroplasts using a multi-gene assembly and transformation system. Transgenic rice plants carrying GOC bypass (GOC plants) showed significant increases in photosynthesis efficiency, biomass yield, and nitrogen content, as well as several other CO2-enriched phe no types under both greenhouse and field conditions .Grain yield of GOC plants varied depending on seeding season and was increased significantly in the spring. We further demonstrated that GOC plants had significant advantages under high-light conditions and that the improvements in GOC plants resulted primarily from a photosynthetic CO2-concentrating effect rather than from improved energy balance. Taken together, our results reveal that engineering a newly designed chloroplastic photorespiratory bypass could increase photosynthetic efficiency and yield of rice plants grown in field conditions, particularly under high light.

关键词： photorespiratory bypass photosynthetic efficiency productivity rice

Multiple lines of evidence supports the two varieties of Halenia elliptica(Gentianaceae)as two species

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

Plant Diversity 2022年第3期44卷 290-299页

作者： Jin-Feng Wu Dong-Rui Jia Rui-Juan liu Zhi-Li zhou lin-lin Wang min-Yu Chen Li-hua Meng Yuan-Wen duan School of Life Sciences Yunnan Normal UniversityKunming 650092PR China School of Ecology and Environmental Science&Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments Yunnan UniversityKunming 650091PR China Northwest Institute of Plateau Biology Chinese Academy of SciencesXining 810001PR China The Germplasm Bank of Wild Species Institute of Tibetan Plateau Research at KunmingKunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanPR China Yunnan Lijiang Forest Ecosystem National Observation and Research Station Kunming Institute of BotanyChinese Academy of SciencesLijiang 674100YunnanPR China

Delimiting species requires multiple sources of ***,we delimited two varieties of Halenia elliptica(Gentianaceae)using several lines of evidence,including morphological traits and mating system in a sympatric population,phylogenetic relationships based on nrITS and cpDNA(rpl16)data,and complete chloroplast genome *** analysis of 21 morphological traits clearly separates the two varieties of *** of the flowering process and pollination treatments indicate that *** *** produces seeds via outcrossing,whereas *** *** produces seeds via mixed ***,hand-pollinated hybridization of the two varieties produced no *** of pollinators showed that when bees began a pollination bout on *** *** they preferred to continue pollinating this variety;however,when they began a pollination bout on *** ***,they showed no preference for either *** analysis confirmed the monophyly of ***,which was further divided into two monophyletic clades corresponding to the two varieties.A large number of variants from the chloroplast genomes reflected remarkable genetic dissimilarities between the two varieties of *** recommend that the two varieties of *** should be revised as two species(*** and ***).Our findings indicate that *** varieties may have split into two separate species due to a shift in mating system,changes in flowering phenology and/or post-pollination reproductive isolation.

关键词： Halenia elliptica Flowering phenology Mating system Reproductive isolation Monophyly Species delimitation

不同冷却制度下X100管线钢组织特征及力学性能

在线全文

学校读者我要写书评

暂无评论

钢铁 2011年第2期46卷 74-80页

作者：周民杜林秀刘相华东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110004

采用热模拟试验机和试验轧机研究了X100管线钢连续冷却相变规律及不同冷却制度下显微组织特征及力学性能变化规律。研究结果表明:随冷却速度升高及终冷温度降低,试验钢显微组织由针状铁素体过渡至板条贝氏体及马氏体,非淬火条件试验钢... 详细信息

采用热模拟试验机和试验轧机研究了X100管线钢连续冷却相变规律及不同冷却制度下显微组织特征及力学性能变化规律。研究结果表明:随冷却速度升高及终冷温度降低,试验钢显微组织由针状铁素体过渡至板条贝氏体及马氏体,非淬火条件试验钢中马氏体岛或M-A岛为微孪晶马氏体;轧制后直接以30℃/s冷却至450℃左右时,试验钢具有良好强韧性,采用弛豫及超快冷工艺时,需控制弛豫时间以及超快冷结束温度并与随后的冷却工艺相结合,方可获得理想的显微组织及良好的强韧性。

关键词：显微组织力学性能弛豫超快冷