检索结果-南通市图书馆

rESEArCH ON HYDrOFOrMING TUBULAr PArT WITH LArGE PErIMETEr DIFFErENCE

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2008年第2期21卷 133-138页

作者： x.S. Wang S.J. Yuan x.r. Huang Y.x. Yao Z.r. Wang School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China

The tube hydro forming process for manufacturing the tubular part with large perimeter difference was studied by means of experiments and FE simulation. It is an asymmetrical one and the expansion ratio is 70 percent. The part is successfully hydro formed by applying the useful wrinkles to accumulate sufficient metal in the area with large expansion ratio. The thickness distribution is analyzed, and the maximum thinning ratio of the part is 21.6 percent. It is shown from the experiment and simulation results that the tubular part with large perimeter difference, long expansion area and asymmetrical shape can be obtained in one step, applying the useful wrinkles. Typical failure modes were analyzed.

关键词： Hydro forming Large expansion Useful wrinkle Asymmetricalpart

在线全文

学校读者我要写书评

暂无评论

王阳明在浙江活动足迹时空数据集研发

全球变化数据学报(中英文) 2024年第1期8卷 51-57,V0051-V0057页

作者：朱镜衣胡翔然马仁锋王郡瑜王艺潼宁波大学地理与空间信息技术系宁波315211

王阳明是明代著名的思想家、哲学家、教育家和政治家,他提出的“心即理”和“知行合一”的哲学思想在中国文化史上具有深远影响。本文以王阳明生平资料为研究对象,综合考虑地理与历史两个角度,基于人物、时间、地点、事件等关键字段,建... 详细信息

王阳明是明代著名的思想家、哲学家、教育家和政治家,他提出的“心即理”和“知行合一”的哲学思想在中国文化史上具有深远影响。本文以王阳明生平资料为研究对象,综合考虑地理与历史两个角度,基于人物、时间、地点、事件等关键字段,建立王阳明在浙江活动足迹时空数据集,并立体化地展示王阳明在浙江的行动时空棱柱。数据集内容包括(1)王阳明在浙江活动的文本数据(.xlsx);(2)足迹地理信息数据(.shp);(3)王阳明足迹三维线数据(.shp)。由16个数据文件组成,数据量为258 KB(压缩为1个文件,114 KB)。

关键词：历史地理 GIS 时空轨迹王阳明

MAfHEMAfICAL MODEL FOr MELTING PrOCESSES OF SOLID ArTICLES IMMErSED IN METAL BATHS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 259-266页

作者： B.K. Li x.F. Ma x.r. Zhang and J.C. He (Northeastern University, Shenyang 110006, China)(Northeastern University, Shenyang 110006, China)(Northeastern University, Shenyang 110006, China)(Northeastern University, Shenyang 110006, China) Northeastern University Shengyang China

A mathematical model for melting processes of solid particles immersed in metal baths has been develOPed, which includes the cases with the melting point of solid particles greater than, equal to, and lower than freezing point of the bath. Experiments are performed on the melting of ice spheres in water at different temperature. The model is validated by experimental data for melting of ice spheres submerged in water and aluminum spheres immersed in aluminum melt. Finally, the parometers affecting particles melting time such as particle size, bath temperature, and slip velocity are analyzed.

关键词： mathematical model phase change solid particle

Identification of rf gene conferring fertility restorers of CMS-Dian Type 1 in rice (Oryza sativa L.) with SSr markers based on advanced inbred lines

在线全文

学校读者我要写书评

暂无评论

Identification of Rf gene conferring fertility restorers of ...

Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies

中国遗传学会七届一次青年研讨会暨上海高校模式生物E——研究院第一届模式生物学术研讨会

作者： x.L. Tan, Y.L. Tan, Y.H. Zhao, x.M. Zhang, r.K. Hong, S.L. Jin, x.r. Liu, D.J. Huang (rice research Institute, Yunnan Agricultural University, Kunming 60201, China.)

A total of 258 advanced inbred lines, including maintainers and restorers generated in breeding program for development of japonica hybrid rice based on cytoplasmic male sterility (CMS) of Dian-type 1, were used to detect major gene conferring fertility restoration of the CMS system. A gene, conferring fertility restoration for the CMS system, was detected by microsatellite markers on chromosome 10. The gene, designated as rf-D1(t) temporally, was located between two SSr markers, OSr33 and rM228, and genetic distances of the markers to the gene were 3.4 cM and 5.0 cM, respectively. The linkages were confinned with 118 segregants of an F2 population derived from a cross between a CMS line crossed with a restorer of Dian Type 1. The research results also demonstrated that the restorer identification with OSr33 were not only reliable but also economical.

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

Matter and radiation at Ex.r.mes 2024年第3期9卷 11-18页

作者： Y.x.Wang x.L.Zhu S.M.Weng P.Li x.F.Li H.Ai H.r.Pan Z.M.Sheng Key Laboratory for Laser Plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China research Center of Laser Fusion of China Academy of Engineering Physics MianyangSichuan 621900China State key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ultrashort high-power light sources in the mid-infrared(mid-Ir)to terahertz(THz)range is of interest for applications in a number of fields,from fundamental research to biology and *** conventional laser technology,photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-Ir or THz ***,we present a photon deceleration scheme for the efficient generation of ultrashort mid-Ir or THz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long *** signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver *** to its relatively long wavelength,the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake ***,the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer *** greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength Ir and THz spectral ranges.

关键词： laser ultrashort photon

PrEDICTION OF FLOW STrESS OF HIGH-SPEED STEEL DUrING HOT DEFOrMATION BY USING BP ArTIFICIAL NEUrAL NETWOrK

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

Acta Metallurgica Sinica(English Letters) 2000年第1期13卷 394-400页

作者： J. T. Liu H.B. Chang r.H. Wu T. Y. Hsu(xu Zuyao) and x.r. ruan( 1)Department of Plasticity Technology, Shanghai Jiao Tong University, Shanghai 200030, China 2)School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030,

The hot deformation behavior of TI (18W-4Cr-1V) high-speed steel was investigated by means of continuous compression tests performed on Gleeble 1500 thermomechan- ical simulator in a wide range of tempemtures (950℃-1150℃) with strain rotes of 0.001s-1-10s-1 and true strains of 0-0. 7. The flow stress at the above hot defor- mation conditions is predicted by using BP artificial neural network. The architecture of network includes there are three input parameters:strain rate,temperature T and true strain , and just one output parameter, the flow stress ,2 hidden layers are adopted, the first hidden layer includes 9 neurons and second 10 negroes. It has been verified that BP artificial neural network with 3-9-10-1 architecture can predict flow stress of high-speed steel during hot deformation very well. Compared with the prediction method of flow stress by using Zaped-Holloman parumeter and hyperbolic sine stress function, the prediction method by using BP artificial neurul network has higher efficiency and accuracy.

关键词： T1 high-speed steel flow stress prediction of flow stress back propagation (BP) artificial neural network (ANN)

Distinct Electrical and Mechanical responses of a Cu-10Fe Composite Prepared by Hot-Pressed Sintering and Post Treatment

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 255-265页

作者： x.Y.Yue S.Y.Peng x.Zhang C.N.He Y.Z.Tian Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin300350China research Centre for Metallic Wires Northeastern UniversityShenyang110819China

A Cu-10wt%Fe composite was prepared through hot-pressed sintering,and the material was subsequently solution *** hot-pressed sintered and solution treated materials were rolled and *** precipitation behavior and performance changes were systematically studied by using scanning electron microscopy and transmission electron *** contrast to the hot-pressed sintered specimen,the solution treatment significantly affects the thermal stability and properties of the Cu-10wt%Fe *** Cu-10wt%Fe composite was prepared after solid solution,cold rolling and aging at 773 K for 1 h,and it obtained excellent tensile strength of 494 MPa,uniform elongation of 16.3%,electrical conductivity of 51.1%IACS and softening temperature of 838 *** for the distinct difference in thermal stability and properties between hot-pressed sintered and solution treated specimens were *** findings provide a theoretical basis for designing high-performance Cu-based in-situ composites by post treatment.

关键词： Cu-Fe composite Hot-pressed sintering Thermal stability Strength Electrical conductivity

Large non-pedunculated colorectal polyp management: The elephant in the room

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

World Journal of Gastroenterology 2024年第25期30卷 3126-3131页

作者： Shirley x Jiang Neal Shahidi Department of Medicine University of British ColumbiaVancouver V6Z 2K5BCCanada

Minimally invasive innovations have transformed *** to colorectal cancer(CrC),there has been a shift towards less invasive surgical techniques and use of endoscopic resection as an alternative for low risk T1 *** role of endoscopic resection is however much more extensive:It is now considered the first line management strategy for most large(≥20 mm)non-pedunculated colorectal polyps,the majority of which are *** is due to the well-established efficacy,safety,and cost-effectiveness of endoscopic techniques compared to *** endoscopic modalities now exist with distinct risk-benefit profiles and their outcomes are further improved by site-specific technical modifications,auxiliary techniques,and adverse event miti-gation *** capacity continues to evolve with emerging endoscopic techniques and expanding applications,particularly in the confines of a multi-disciplinary setting.

关键词： Cancer Colonoscopy Endoscopy Polyp Endoscopic mucosal resection Endoscopic submucosal dissection

北半球冻土顶板温度与活动层厚度0.625°×0.4712°栅格数据集(2015-2100)研发方法

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

全球变化数据学报（中英文） 2022年第3期6卷 479-486,V0479-V0486页

作者：吴潇然赵娜叶延磊中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室北京100101 中国科学院大学资源与环境学院北京100049 江苏省地理信息资源开发与利用协同创新中心南京210023 正元地理信息集团股份有限公司北京101300

评估当前和未来多年冻土空间分布和动态变化对全球碳循环模拟、气候变化预测以及工程风险评估至关重要。本文使用经广泛验证和应用的半经验模型Kudryavtsev方法,综合考虑温度、积雪、植被、土壤等因素对冻土的影响,以国际耦合模式比较... 详细信息

评估当前和未来多年冻土空间分布和动态变化对全球碳循环模拟、气候变化预测以及工程风险评估至关重要。本文使用经广泛验证和应用的半经验模型Kudryavtsev方法,综合考虑温度、积雪、植被、土壤等因素对冻土的影响,以国际耦合模式比较计划第六阶段(CMIP6)模式模拟结果和SoilGrids 2.0数据集等作为输入,计算了2015-2100年北半球冻土顶板温度与活动层厚度在SSP126、SSP245、SSP370和SSP585四种不同情景下的逐年时间序列数据,并根据顶板温度计算了北半球冻土面积。该数据集填补了未来不同情境下冻土分布预测数据的空缺,为冻土退化、气候变化、北极生态等相关研究提供了数据参考。数据集包括2015-2100年逐年以下实验数据:(1)冻土顶板温度数据;(2)活动层厚度数据;(3)冻土面积数据。数据集存储为.tif和.xls格式,空间分辨率为0.625°×0.4712°,由690个数据文件组成,数据量为35.6 MB。

关键词：冻土冻土顶板温度活动层厚度 Kudryavtsev CMIP6 北半球,预测