检索结果-南通市图书馆

Possibility of Inducing Compressive Residual Stresses in Welded Joints of SS400 Steels

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 Materials Science & Technology 2001年第6期17卷 661-663页

作者： Quanhong LIN, Jing CHEN and Huaining CHEN Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [manuscript received December 19, 2000, in revised form March 8, 2001] Chinese Acad Sci Met Res Inst Shenyang 110016 Peoples R China

Since the welded constructions produce easily stress corrosion cracking (SCC) or fatigue disruption in corrosive medium or under ripple load, two methods inducing compressive stress on structural surfaces by anti-welding-heating treatment (AWHT) and explosion treatment (ET) are presented. The results show that they are good ways to resisting SCC on the welded SS400 steel or other components.

关键词： In Possibility of Inducing Compressive Residual Stresses in Welded Joints of SS400 Steels SS

维普期刊数据库

Tensile Properties and Microstructure of DS NiAl-28Cr-5.8Mo-0.2Hf Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2002年第2期18卷 181-184页

作者： Chuanyong CUI, Jianting GUO, Yihui QI and Hengqiang YEInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [ manuscript received March 12, 2001, in revised form April 6, 2001] Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

A multiphase alloy NiAI-28Cr-5.8Mo-0.2Hf was directionally solidified in Ar atmosphere in an Al2O3-SiC2 mold by standard Bridgman method. The fracture toughness and tensile properties at 980℃ as well as tensile creep at 1050℃ were studied. It was found that the strength of the present alloy is higher than that of many NiAI-based alloy and the stress exponent n for creep is about 6.69. Then the possible strengthening mechanism and creep mechanism are also discussed.

关键词： Intermetallic NiAl Microstructure Mechanical properties

维普期刊数据库

Optimal Design of a Distributed Optical Fiber Temperature Sensor system Based on Raman Back-scattering

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2001年第1期 30-34页

作者： CHANG Cheng LI Zheng ZHOU Yinqing (Department of Electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China) received March 20, 2000 revised manuscript received may 22, 2000

The distributed optical fiber sensor system based on Raman back scattering has many advantages and gains more interests. However, the intensity of the back scattering light, especially the anti Stokes light is too weak to be detected without certain special arrangements. This paper presents three important principles for optimal design of the system after the optimal analysis of the center wavelength, the optimal design of the Raman filters and the cluster analysis of the LD’s spectrum. They are proved reasonable and useful to an actual system design.

关键词： Raman scattering optical fiber temperature sensor

Distortion Invariant Binary Image Recognition Based on Central Projection Correlation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2001年第4期 42-48页

作者： WU Yaming XIAO Yanping SUN Fanghong  FANG Nian (School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China) received Aug. 9, 2000 revised manuscript received Dec. 20, 2000

A method of central projection correlation which is invariant to distortion of shift, scale and rotation of the binary target image is proposed. A 2 D binary image is transformed into an 1 D central projection referring to the centroid of the binary image. The distortion invariant central projection correlation is successfully performed by computer simulations and its optical implementation is presented.

关键词： central projection distortion invariant image recognition optical matched filter correlation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

核破裂中的粒子发射和临界涨落

物理学报 1999年第10期48卷 1839-1844页

作者：马余刚中国科学院上海原子核研究所上海201800

用晶格气体模型系统地研究了１２９Ｘｅ热发射体的轻粒子、带电粒子和中间质量碎片的发射特性，发现了在温度５ —５５ＭｅＶ区间，以上物理量的平均多重性和发射源的最大碎片余核及源的热激发能随温度变化的斜率存在着各自的... 详细信息

用晶格气体模型系统地研究了１２９Ｘｅ热发射体的轻粒子、带电粒子和中间质量碎片的发射特性，发现了在温度５ —５５ＭｅＶ区间，以上物理量的平均多重性和发射源的最大碎片余核及源的热激发能随温度变化的斜率存在着各自的峰值，同时它们的分布宽度（即涨落）也存在着最大值．进一步研究发现在５ —５５ＭｅＶ区间，这些宽度随温度的变化的斜率显示了明显的不连续性．所有这些特征说明了在５ —５５ＭｅＶ的拐点温度处，最大的临界涨落是自发地伴随着相变和临界现象．

关键词：粒子发射临界涨落核核碰撞核破裂

维普期刊数据库

Two-Dimensional　Collimation　of　an　Atomic　Beam　in　a　Diffuse　Light　Field

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1995年第6期B4卷 489-494页

作者： LI Foshen CHEN Hongxin CAI Weiquang LIU Liang SHU Wei WANG Yuzhu(Joint Laboratory for Quantum Optics,Shanghai Institute of Optics and Fins Mechanics, Academia SinicaP. O. for 800-211, Shanghai 201800, China)(received 19 Jan. 1995 revised manuscript rece Shanghai Inst of Optics and Fine Mechanics Academia Sinica Shanghai China

Ｔｗｏ－ＤｉｍｅｎｓｉｏｎａｌＣｏｌｌｉｍａｔｉｏｎｏｆａｎＡｔｏｍｉｃＢｅａｍｉｎａＤｉｆｆｕｓｅＬｉｇｈｔＦｉｅｌｄ￥ＬＩＦｏｓｈｅｎ；ＣＨＥＮＨｏｎｇｘｉｎ；ＣＡＩＷｅｉｑｕａｎｇ；ＬＩＵＬｉａｎｇ；ＳＨＵＷｅ... 详细信息

Ｔｗｏ－ＤｉｍｅｎｓｉｏｎａｌＣｏｌｌｉｍａｔｉｏｎｏｆａｎＡｔｏｍｉｃＢｅａｍｉｎａＤｉｆｆｕｓｅＬｉｇｈｔＦｉｅｌｄ￥ＬＩＦｏｓｈｅｎ；ＣＨＥＮＨｏｎｇｘｉｎ；ＣＡＩＷｅｉｑｕａｎｇ；ＬＩＵＬｉａｎｇ；ＳＨＵＷｅｉ；ＷＡＮＧＹｕｚｈｕ（Ｊｏｉｎｔ...

关键词： laser cooling atomic beam collimation

Laser Induced Damage in CVD Diamond Films

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1998年第1期 74-79页

作者： QIU Hong FAN Zhengxiu(Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,P.O.Box 800211, Shanghai 201800, China)received Apr. 15 1997 revised manuscript received July 19 1997

ＬａｓｅｒＩｎｄｕｃｅｄＤａｍａｇｅｉｎＣＶＤＤｉａｍｏｎｄＦｉｌｍｓＱＩＵＨｏｎｇＦＡＮＺｈｅｎｇｘｉｕ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅ... 详细信息

ＬａｓｅｒＩｎｄｕｃｅｄＤａｍａｇｅｉｎＣＶＤＤｉａｍｏｎｄＦｉｌｍｓＱＩＵＨｏｎｇＦＡＮＺｈｅｎｇｘｉｕ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｐ．Ｏ．...

关键词： CVD diamond film XRD LIDT absorption

Timing Jitter Induced by White Noise in Mode-locked Solid-state Lasers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2000年第5期 28-33页

作者： LU Hong 〔The Femtosecond Technology Research Association (FESTA), 1 1 4 Umezono, Tsukuba Ibaraki 305 8568, Japan〕 received Feb. 15, 2000 revised manuscript received Apr. 10, 2000

A new method is proposed to analyze and calculate the jitters in a mode locked solid state laser with chirp. A set of motion equations for amplitude, inverse pulse width, chirp, frequency, pulse central position and phase in a femtosecond mode locked solid state laser are derived, and then the jitter induced by white noise is obtained. In a Ti sapphire mode locked laser, the jitter is theoretically estimated, and the result is well consistent with the experimental value.

关键词： timing jitter white noise mode locked solid\|state lasers

Experimental Study on Stable 10-GHz Actively Mode-locked Fiber Ring Laser

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1999年第3期 2-7页

作者： LI Yuhua LOU Caiyun WU Jian CHANG Guoqing WU Boyu GAO Yizhi ZHOU Bingkun (Department of Electronic Engineering, Tsinghua University, Beijing 100084, China) received Dec. 1, 1998 revised manuscript received Feb. 21, 1999

１ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｄｅｌｏｃｋｅｄｆｉｂｅｒｌａｓｅｒｓａｒｅｔｈｅａｔｒａｃｔｉｖｅｓｏｕｒｃｅｓｏｆｕｌｔｒａｓｈｏｒｔｏｐｔｉｃａｌｐｕｌｓｅｓａｔｔｈｅｃｏｍｍｕｎｉｃａｔｉｏｎｗａｖｅｌｅｎｇ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｄｅｌｏｃｋｅｄｆｉｂｅｒｌａｓｅｒｓａｒｅｔｈｅａｔｒａｃｔｉｖｅｓｏｕｒｃｅｓｏｆｕｌｔｒａｓｈｏｒｔｏｐｔｉｃａｌｐｕｌｓｅｓａｔｔｈｅｃｏｍｍｕｎｉｃａｔｉｏｎｗａｖｅｌｅｎｇｔｈｏｆ１．５５μｍｂｅｃａｕｓ...

关键词： laser stability ultra short pulse generation fiber ring laser actively mode locked