检索结果-南通市图书馆

Cleaning of Chromate Manufacture Process

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 132-134页

作者： Xing zou Yi Zhang(Applied Science School, University of Science and Technology beijing, beijing 100083, china)(institute of Engineering Chemistry and Metallurgy, Chinese Academy of sciences, beijing 100080, china) Applied Science School University of Science and Technology Beijing Beijing 100083 China institute of Engineering Chemistry and Metallurgy Chinese Academy of Sciences Beijing 100080 China

Sodium chromate solubility is determined in the range of NaOH concentrations from 450 to 810 g/L andsolution temperatUres from 30 to 110℃. The optimized conditions to separate sodium chromate from NaOH inleached solution are resolved. It is first found the method to efficiently separate sbdium chromate from NaOH andsodium altuninate in crude sodium chromate. Bench-scale studies on the separating are performed. Finally, goodseparation results are achieved.

关键词： chromate separation clean process

Residual stress around rail bolt holes after cold-expansion

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 1997年第3期11卷 35-42页

作者： SHEN Hongwei SU N Ning MU Ensheng zou dingqiang ({2. Academy of railway sciences, beijing 10008 1, {2.)

Focused on rail bolt hole cold-expansion, the theoretical prediction models and results of residual stress analysis on related Problems are summarized. And a stress analyzing method based on both of the strain measurement duringthe Process of cold expansion and elastoc-plastic theory is developed. By the method proposed and the magneto-elasticmethod as well as the stress relief measurement detailed experimental study on the residual stress surrounding the coldexpanded tail bolt hole is performed. Relationship between the distribution of residual stress and cold expansion rateare established. The adaptability and limitation of theoretical predichon are also analyzed by comparing the theoreticaland experimental results.

关键词： cold expansion rail bolt hole stress analysis

A note on n-edge chromatic number

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第23期42卷 1952-1954页

作者： SUN Liang and ZHANG Zhongfu1. Department of Applied Mathematics, beijing institute of Technology, beijing 100081, china 2. institute of Applied Mathematics, Lanzhou institute of railway, Lanzhou 730070, china Department of Applied Mathematics Beijing Institute of Technology Beijing 100081 China

ALL graphs appearing in this note are simple. A graph with p vertices and q edges will becalled a (p, q )-graph. The maximum degree of G is denoted by Δ(G).Let n≥2.be an integer. The n-edge chromatic number X_n (G) of a simple graph G is theminimum cardinality of a set of colors with which one can assign the colors to the edges of Gsuch that the edges on a path of length less than or equal to n receive different *** aim of this note is to explore the bounds for X’_n (G) and X’_n (G) + X’_n (G). It is

关键词： graph complement n-edge chromatic number.

Measurement　of　the　First　Hyperpolarizability　of　Substituted　Ketene　N，S－acetals　by　Hyper－Rayleigh　Scattering　in　Solution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1995年第5期B4卷 431-438页

作者： GAO Xingyu CHEN Jingbiao WANG Congfang zou Yinghua (Department of Physics, Peking University, beijing 100871, {2.)zou Yue FENG Jun LI Jisheng YE Cheng (institute of Chemistry, academia sinica, beijing 100080,{2.) Peking Univ Beijing China

ＭｅａｓｕｒｅｍｅｎｔｏｆｔｈｅＦｉｒｓｔＨｙｐｅｒｐｏｌａｒｉｚａｂｉｌｉｔｙｏｆＳｕｂｓｔｉｔｕｔｅｄＫｅｔｅｎｅＮ，Ｓ－ａｃｅｔａｌｓｂｙＨｙｐｅｒ－ＲａｙｌｅｉｇｈＳｃａｔｔｅｒｉｎｇｉｎＳｏｌｕｔｉｏｎＧＡ... 详细信息

ＭｅａｓｕｒｅｍｅｎｔｏｆｔｈｅＦｉｒｓｔＨｙｐｅｒｐｏｌａｒｉｚａｂｉｌｉｔｙｏｆＳｕｂｓｔｉｔｕｔｅｄＫｅｔｅｎｅＮ，Ｓ－ａｃｅｔａｌｓｂｙＨｙｐｅｒ－ＲａｙｌｅｉｇｈＳｃａｔｔｅｒｉｎｇｉｎＳｏｌｕｔｉｏｎＧＡＯＸｉｎｇｙｕ；ＣＨＥＮＪｉｎｇｂ...

关键词： Hyper-Rayleigh scattering first hyperpolarizability

Strong decays of N~*(1535) in an extended chiral quark model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,mechanics & Astronomy) 2009年第10期52卷 1452-1457页

作者： AN ChunSheng1,2.3 & zou BingSong1,2.3 1 institute of High Energy Physics,Chinese Academy of {2.,beijing 100049,china 2.Theoretical Physics Center for Science Facilities,Chinese Academy of {2.,beijing 100049,china 3 Graduate University of Chinese Academy of {2.,beijing 100049,china institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Theoretical Physics Center for Science Facilities Chinese Academy of Sciences Beijing 100049 China Graduate University of Chinese Academy of sciences Beijing 100049 China

The strong decays of the N*(1535) resonance are investigated in an extended chiral quark model by including the low-lying $ qqqq\bar q $ components in addition to the qqq component. The results show that these five-quark components in N*(1535) contribute significantly to the N*(1535) → Nπ and N*(1535) → Nη decays. The contributions to the Nη decay come from both the lowest energy and the next-tolowest energy five-quarks components, while the contributions to the Nπ decay come from only the latter one. Taking these contributions into account, the description for the strong decays of N*(1535) is improved, especially for the puzzling large ratio of the decays to Nη and Nπ.

关键词： N*(1535) strong decays five-quark components

Optimization of mathematical models for thematic maps

在线全文

学校读者我要写书评

暂无评论

Science china(Technological sciences) 2010年第S1期53卷 15-24页

作者： QI QingWen1,ZHANG An1,JIANG LiLi1,zou XiuPing2.XU Li3 & CHENG Xi1,4 1 institute of Geographical {2. and Natural Resources Research,Chinese Academy of {2.,beijing 100101,china 2.institute of Policy and Management,Chinese Academy of {2.,beijing 100080,china 3 Taishan University,Taian 2.102.,china 4 Graduate University of Chinese Academy of {2.,beijing 100049,china Chinese Acad Sci Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China Chinese Acad Sci Inst Policy & Management Beijing 100080 Peoples R China Taishan Univ Tai An 271021 Shandong Peoples R China Chinese Acad Sci Grad Univ Beijing 100049 Peoples R China

The thematic map is a major class of maps designed to demonstrate particular features or concepts,functioning as an indispensable tool in geographical *** process of thematic mapping is one into which geographical research goes deeply and *** key activity and course of thematic map production is the use of mathematical models to create thematic data ***,the selection and optimization of mathematical models is in the forefront of thematic map *** theoretical foundations,mechanisms and methods of mathematical model optimization are expounded in this paper,including two approaches,the phase by phase mode and the multi-aim scheme balance *** studies in eco-environment mapping and emergency mapping are described and analyzed,with a hierarchical analysis method being used in the model optimization for eco-environment fragility and sensitivity assessment mapping in Beibuwan (Guangxi) District,the dynamic system (DS) method being used in the model optimization for ecological security adjustment mapping in Xishuang Banna,Yunnan province,and the multi-phase mode being used in the models for forest fire and infectious diseases mapping.

关键词： thematic map mathematic model optimization

De-interlacing technique based on total variation with spatial-temporal smoothness constraint

在线全文

学校读者我要写书评

暂无评论

Science in china(Series F) 2007年第4期50卷 561-575页

作者： YIN XueMin1,2.3, YUAN JianHua1,2. LU XiaoPeng1,2.& zou MouYan1,2.1 institute of Electronics, Chinese Academy of {2., beijing 100080, china 2.Graduate School, Chinese Academy of {2., beijing 100039, china 3 Jiuquan Satellite Launch Center, Lanzhou 732.50, china 1. institute of Electronics Chinese Academy of Sciences Beijing 100080 China 2. Graduate School Chinese Academy of Sciences Beijing 100039 China 3. Jiuquan Satellite Launch Center Lanzhou 732750 China

This paper introduces a new method of converting interlaced video to a progressively scanned video and image, The new method is derived from Bayesian framework with the spatial-temporal smoothness constraint and the MAP is done by minimizing the energy functional, The half-quadratic regularization method is used to solve the corresponding partial differential equations （PDEs）, This approach gives the improved results over the conventional de-interlacing methods, Two criteria are proposed in the paper, and they can be used to evaluate the performance of the de-interlacing algorithms,

关键词： video processing de-interlacing total variation spatio-temporai smoothness constraint PDEs half-quadratic regularization

Prediction of Dynamic Wellbore Pressure in Gasified Fluid Drilling

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2007年第4期4卷 66-73页

作者： Wang Zhiming1,Ping Liqiu2.and zou Ke2.(1. School of Petroleum Engineering,Petroleum University of china,{2. 102.49,china) (2. institute of Drilling Engineering Technology,CNPC,{2. 100097,china) Petr Univ china Sch Petr Engn Beijing 102249 Peoples R China CNPC Inst Drilling Engn Technol Beijing 100097 Peoples R China

The basis of designing gasified drilling is to understand the behavior of gas/liquid two-phase flow in the wellbore. The equations of mass and momentum conservation and equation of fluid flow in porous media were used to establish a dynamic model to predict wellbore pressure according to the study results of Ansari and Beggs-Brill on gas-liquid two-phase flow. The dynamic model was solved by the finite difference approach combined with the mechanistic steady state model. The mechanistic dynamic model was numerically implemented into a FORTRAN 90 computer program and could simulate the coupled flow of fluid in wellbore and reservoir. The dynamic model revealed the effects of wellhead back pressure and injection rate of gas/liquid on bottomhole pressure. The model was validated against full-scale experimental data,and its 5.0% of average relative error could satisfy the accuracy requirements in engineering design.

关键词： Gasified fluid drilling dynamic model pressure prediction model validation

MICROSTRUCTURE AND FATIGUE PROPERTIES OF RAIL 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

Acta Metallurgica sinica(English Letters) 1991年第1期4卷 65-70页

作者： ZHOU Qingyue ZHO U Chenguang china Academy of railway {2.,beijing,china Engineer,Metal and Chemistry Research institute,china Academy of railway {2.,beijing 100081,china

The subcritical propagation of fatigue cracks and the microstructure of rail steel with relation to stress ratio have been *** effect of mierostrueture of the rail steel on their fatigue lives has been discussed.

关键词： rail steel microstructure fatigue life stress ratio