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Thermal Aspects for Face Grinding of Ceramics

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厦门大学学报（自然科学版） 2002年第S1期41卷 123-124页

作者： SHEN Jian-yun, ZENG Wei-ming, HUANG Hui, XU Xi-peng (college of Mechanical Engineering and Automation, Huaqiao university , Quanzhou 362011, china)

To meet the increasing demand on the quality and co st of precision structural components, extensive studies on high efficiency and pr ecision machining of ceramic materials, including face grinding, have been condu cted over the past several years. However, there are few reports about the mecha nism in face grinding of ceramics, especially the thermal aspects during the gri nding process. In the present study, experiments of face grinding two typical ce ramics were carried out to study themal aspects at the wheel-workpiece contact zone. The present investigation was undertaken to experimentally study the energy part ition to workpiece and thermal characteristics during face grinding of two typic al ceramics. For this purpose, grinding temperature distribution in the ceramics workpiece was calculated with the classic moving heat source theory. The grindi ng temperature at the wheel-workpiece contact zone was measured under different machining conditions using a grindable foil thermocouple. Combining the analyti cal results and the experimental result for temperatures, the mechanism of energ y partition in face grinding of ceramic materials was discussed. According to the experimental results and the comparison of theoretic and measur ed temperature profiles, temperature characteristics and mechanism of energy par tition in face grinding of ceramic materials were discussed. Temperature rise in the workpiece and energy partition during the grinding process were found to be derictly related to the machining parameters and the mechanism of mateirial rem oval. The increasing of either v w or a p can lead to an increase of temperatu re. The temperature rise in Si 3N 4 is much lower than that in ZrO 2 under th e same condition, which might be attributed to the different material removal me chanisms. Both temperatures in dry grinding and in wet grinding are not high eno ugh to cause thermal damage to ceramic materials. The value of energy partition increases with the increa

关键词： ceramic face grinding grinding temperature

Strengthen the Environmental Sense of Local Community with prA and MIGIS

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Journal of Geographical sciences 2000年第2期10卷 177-184页

作者： CAI Kui, MA Huan-cheng, John McDinnon, Jack McConchie, Jean McKinnon (Yunnan Institute of Geography, Kunming 650092, china, Southwest Forestry college,Kunming 650092, china, 3. School of Earth Science, Wellington-Victoria university,Wellington, New Zeal 云南地理所云南昆明西南林学院云南昆明 Wellington-Victoria university 新西兰 KISA 新西兰

It was widely recognized that rural development especially rural development in the poor areas is closely related with environment issue. It is also common bias that farmers in the poor areas lack of environmental awareness, and their production activities directly cause the environment degradation. The study has shown that with appropriate outside facilitation. a poor rural community can not only analyze its environmental problem, but can also make feasible planning to recover the problem.

关键词： rural community prA, MIGIS

Determination of Ammonium Ion in Lake Water by Voltammetry

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Wuhan university Journal of Natural sciences 2004年第3期9卷 366-370页

作者： WuYun-hua FeiJun-jie DangXue-ping HuSheng-shui collegeofChemistryandMolecularsciences WuhanUniversityWuhan430072HubeiChina

An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described. Under optimized analytical conditions, the linear range of the calibration graphs for ammonium ion is 3.0×10?5?5.0×10?3 mol·L?1 with a detection limit of 5.0×10?6 mol·L?1. The method has been applied to the determination of ammonium ion in lake water samples and recoveries of 100%–103% are obtained. The results obtained are found to be in good agreement with spectrophotometric results. Key words ammonium ion - voltammetry - platinized platinum electrode CLC number O 657.1 Foundation item: Supported by the National Natural Science Foundation of china (60171023)Biography: Wu Yun-hua (1971-), female, ph. D candidate, research direction: bioelectrochemistry.

关键词： ammonium ion voltammetry platinized platinum electrode

Zinc modulates hippocampus CA1 neurons excitability and glutamatergic synaptic transmission

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Zinc modulates hippocampus CA1 neurons excitability and glut...

第十一次中国生物物理学术大会暨第九届全国会员代表大会

作者： Yu Tao Tian1,Zhuo Yang 2,Tao Zhang 1 1 college of life Science,Nankai university,Tianjin 300071,china 2 college of Medicine Science,Nankai university,Tianjin 300071,china

＜正＞Zinc ion is key physiological importance in mammalian *** is a major structural component of many proteins and acts as co-factors for the activity of many enzymes that are

关键词： zinc hippocampus neuron spontaneous discharges miniature EpSC spontaneous EpSC

SYNTHESIS AND CHArACTErIZATION OF STrUCTUrALLY WELL-DEFINED pOLYMEr-INOrGANIC HYBrID NANOpArTICLES VIA ATrp

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Chinese Journal of polymer Science 2002年第3期20卷 261-267页

作者： Jie Bai Jie-bin pang Kun-yuan Qiu Yen Wei Department of polymer Science & Engineering college of Chemistry & Molecular Engineering peking university Beijing 100871, china Department of Chemistry Drexel university philadelphia, pA 19104 USA peking Univ Coll Chem & Mol Engn Dept Polymer Sci & Engn Beijing 100871 Peoples R China Drexel Univ Dept Chem Philadelphia PA 19104 USA

Atom transfer radical polymerization (ATrp) using cuprous chloride/2,2'-bipyridine (bipy) was applied to graft polymerization of styrene on the surface of silica nanoparticles to synthesize polymer-inorganic hybrid nanoparticles, 2-(4Chloromethylphenyl) ethyltriethoxysilane (CTES) was immobilized on the surface of silica nanoparticles through condensation reaction of the silanol groups on silica with triethoxysilane group of CTES. Then ATrp of St was initiated by this surface-modified silica nanoparticles bearing benzyl chloride groups, and formed pSt graft chains on the surface of silica nanoparticles. The thickness of the graft chains increased with reaction time. End group analysis confirmed the occurrence of ATrp. Thermal analysis indicated that thermal stabilization of these resulting hybrid nanoparticles also increases with polymerization conversion. The results above show that this 'grafting from' reaction could be used for the preparation of polymer-inorganic hybrid nanoparticles with controlled structure of the polymer's end groups.

关键词： atom transfer radical polymerization polymer-inorganic hybrid nanoparticles 2-(4-chloromethylphenyl)ethyltriethoxysilane surface-modification

A Canonical Decomposition of the right Invertible System and All Solutions of the regular row-By-row Decoupling problem

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A Canonical Decomposition of the Right Invertible System and...

第三十届中国控制会议

作者： WEI Musheng~1,SHEN Dongmei~(1,2) 1.college of Mathematics and Science,Shanghai Normal university,Scientific Computing Key Laboratory of Shanghai Universities Shanghai 200234,p.r.china 2.School of Science,Nantong university,Nantong,Jiangsu 226007,p.r.china

＜正＞In this paper,we describe a canonical decomposition of a right invertible system {C,A,B}.By this decomposition, we study all solutions of the regular row-by-row decoupling problem and the regular row-by-row deco... 详细信息

关键词： right invertible system Canonical decomposition regular row-by-row decoupling Stability

NUMErICAL SIMULATION OF DISpErSION IN OSCILLATOrY FLOW WITH rEVErSIBLE AND IrrEVErSIBLE WALL rEACTIONS

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NUMERICAL SIMULATION OF DISPERSION IN OSCILLATORY FLOW WITH ...

第二十届全国水动力学研讨会

作者： Zhang Daoxiang~(1,2) Lu Zhiming~1 Liu Yulu~1 1Shanghai lnstitute of Applied Mathcmatics & Mcchanics,Shanghai university,Shanghai 200072,p.r.china 2 college of Mathematics and Computer Science,Anhui Normal university,Wuhu 241000,p.r.china

＜正＞the dispersion of chemical species through a small-diameter tube is simulated by a numerical method （the Flux Corrected Transport Algorithm-FCT）,where the flow consists of steady and oscillatory components and the species may undergo linear reversible （phase exchange or wall retention） and irreversible （decay or absorption） reactions at the tube *** centre and variance of mass are also *** effects on the area averaged concentration of various dimensionless numbers are *** results reveal unexpected trinal and quadruple peak breakthrough curves for the tube of intermediate length.

关键词： Dispersion Wall reactions

ESTIMATION OF FUNCTION ApprOXIMATION USING DITZIAN-TOTIK'S CONTINUOUS MODEL

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Analysis in Theory and Applications 1999年第2期15卷 100-108页

作者： Sheng Shuyun(Hangzhou university, china)Xu Yanan(Shaoxing college of Arts and Science, china) 1. Department of Mathematics Zhejiang University in Xixi 310028 Hangzhou PRC 2. Shaoxing college of Arts and Science 312000 Shaoxing PRC

Ditzian-Totik'scotinuous modulus of ωφ(f,t) andωφ(f,t), are used to extimate approximation of functions by their F-T series in C-space and Lp-space.

关键词： Math

A Discrete Spectral problem and related Hierarchy of Discrete Hamiltonian Lattice Equations

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Communications in Theoretical physics 2007年第8期48卷 193-198页

作者： XU Xi-Xiang college of Science,Shandong Uniersity of Science and Technology,Qingdao 266510,chinaCAO Wei-Li college of Science,Uniersity of Shanghai for Science and Technology,Shanghai 200093,china college of Science Shandong University of Science and Technology college of Science University of Shanghai for Science and Technology

Staring from a discrete matrix spectral problem,a hierarchy of lattice soliton equations is presentedthough discrete zero curvature *** resulting lattice soliton equations possess non-local Lax *** structures are esta... 详细信息

关键词： lattice soliton equation zero curvature representation Hamiltonian structure Liouville integrability