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Journal of Thermal Science 1993年第2期2卷 81-86页

作者： Wang Cuncheng Thermal engineering Dep.r.ment Tsinghua University, Beijing 100084, p.r. china 1. Thermal engineering Dep.r.ment Tsinghua University 100084 Beijing P.R. China

The human basal state,a non-equilibrium steady state,is analysed in this pap.r.in the light of the First and Second Laws of Thermodynamics whereby the thermodynamic significance of the basal metabolic rate and its distinction to the dissipation function and exergy loss are *** analysis demonstrates the correct expression of the effects of the blood flow on the heat balance in a human-body bio-heat model and the relationship between the basal metabolic rate and the blood p.r.usion.

关键词： thermodynamic laws basal metabolism blood p.r.usion dissipation function exergy loss

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湘湖未来学校,杭州,浙江,中国

世界建筑 2024年第4期 10-15页

作者： china United engineering Corp.r.tion Limited 中国联合工程有限公司

湘湖未来学校是一个30班的九年一贯制学校。位于杭州湘湖景区,用地面积27,644.5m^(2),总建筑面积66,786.7m^(2),其中地下建筑面积30,504m^(2)。湘湖未来学校是一个学生快乐成长大本营。模式化的学校显然已经无法承载培养学生的重任,未... 详细信息

湘湖未来学校是一个30班的九年一贯制学校。位于杭州湘湖景区,用地面积27,644.5m^(2),总建筑面积66,786.7m^(2),其中地下建筑面积30,504m^(2)。湘湖未来学校是一个学生快乐成长大本营。模式化的学校显然已经无法承载培养学生的重任,未来学校应该让学生快乐生活、健康成长、高效学习。建筑设计根植于湘湖历史文脉,总体布局由多重院落空间构成;造型提炼自江南民居形态,塑造了一座现代、典雅的江南书院。

关键词：九年一贯制学校地下建筑面积用地面积高效学习建筑设计湘湖总体布局历史文脉

A new type of wear resistant overlay welding rod

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中国有色金属学会会刊：英文版 2000年第3期10卷 372-374页

作者： ZHANG Qing hui(张清辉) mechanical engineering Institute, Xiangtan University, Xiangtan 411105, p.r.china Xiangtan Univ Inst Engn Mech Xiangtan 411105 Peoples R China

By adopting the alloy wire of Ni 80 Cr 20 as the welding core and adding the alloy elements of B, Si, Mo and W into the outer plating covering, a new type of wear resistant overlay welding rod of Ni Cr B Si was developed. This overlay welding rod has several prop.r.ies such as low melting point and good fluidity. With low content of W and Mo, the wearability and crack resistance of the overlay welding rod can be increased, and the hardness can be increased to about HrC64. This kind of overlay rod has been applied to the overlay of wearable workpieces, such as the valves of high temp.r.ture, high pressure and the side plates of floor boarding brick die.

关键词： Ni Cr B Si wear resistant alloys overlay welding rod

research on the Long Time Swelling prop.r.ies of poly (vinyl alcohol)/Hydroxylapatite Composite Hydrogel

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Journal of Bionic engineering 2009年第1期6卷 22-28页

作者： De-kun Zhang~(1,3), Da-gang Wang~2, Jun-jie Duan~(1,3), Shi-rong Ge~(2,3)1. School of Materials Science and engineering, china University of Mining and Technology, Xuzhou 221116, p. r. china2. School of mechanical and Electrical engineering, china University of Mining and Technology, Xuzhou 221116, p. r. china3. Biotribology Center, National Key Laboratory of Tribology, Tsinghua University, Beijing 100083, p. r. china [a]School of Materials Science and engineering China University of Mining and Technology Xuzhou 221116 P. R. China [b]School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou 221116 P. R. China [c]Biotribology Center National Key Laboratory of Tribology Tsinghua University Beijing 100083 P. R. China

poly(vinyl alcohol)/hydroxylapatite(pVA/HA)composite hydrogel was prep.r.d by repeated freezing and *** water loss prop.r.ies of the resultant hydrogel were investigated by using optical *** time immersion tests of pVA/HA composite hydrogel were carried out in the diluted calf serum solution to study the change laws of swelling prop.r.ies with the freezing-thawing cycles and HA *** micro-morphologies of pVA/HA composite hydrogel after long time immersion were observed by means of the high-accuracy 3D *** results show that the swelling process of pVA/HA composite hydrogel is the converse process of its water *** time swelling ratio curves of pVA/HA composite hydrogel in the calf serum solution are manifested as four stages of quick increase,decrease,slow decrease and stable balance,and its equilibrium swelling ratio decreases with the increase of freezing-thawing cycles and HA *** is revealed that the network structure of the composite hydrogel immersed for a long p.r.od is significantly improved with the increase of HA content. p.r.ect network structures of pVA/HA composite hydrogel as well as full and equilibrium tissues after swelling equilibrium are obtained when the HA content is 3% and the number of freezing-thawing cycles is 7.

关键词： poly (vinyl alcohol) hydroxyapatite composite hydrogel swelling prop.r.y morphology

The Vibration Controllability of 20~# Steel pipe Excited by Unsteady Flow

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1222-1226页

作者：寇子明 College of mechanical engineering Taiyuan University of Technology Shanxi province Mine Fluid Control engineering research Center

An excited exp.r.ment system of 20# steel pipe was established with oil cylinder, 20# steel pipe, frequency converter, pump station and wave exciter generating unsteady flow artificially. The exp.r.mental results showed that the 20# steel pipe could vibrate with the excitation of unsteady flows, and the vibration was p.r.odic, instead of a harmonic one. p.r.icles on the front and rear positions of pipe vibrated synchronously, and the vibration intensity of the pipe＇s two ends was greater than in the middle. System pressure and wave exciter＇s frequency had much influence upon pipe＇s amplitude. pipe＇s vibration frequency was little affected by system pressure, and its value was close to the wave exciter＇s. Therefore, the active control of pipe＇s vibration can be realized by setting system pressure and adjusting frequency converter＇s frequency.

关键词： unsteady flow steel pipe vibration control wave exciter

The Lightweight Design of Low rCS pylon Based on Structural Bionics

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Journal of Bionic engineering 2010年第2期7卷 182-190页

作者： Hongjie Jiao,Yidu Zhang,Wuyi Chen mechanical engineering Design Centre,Beihang University,Beijing 100191,p.r.china [a] mechanical engineering Design Centre Beihang University Beijing 100191 P. R. China

A concept of Specific Structure Efficiency (SSE) was proposed that can be used in the lightweight effect evaluation *** main procedures of bionic structure design were introduced *** p.r.meter relationship betweenhollow stem of plant and the minimum weight was deduced in *** order to improve SSE of pylons, the structural characteristicsof hollow stem were investigated and *** pylon was designed based on analogous biological *** finite element method based simulation, the displacements and stresses in the bionic pylon were comp.r.dwith those of the conventional *** show that the SSE of bionic pylon is improved ***, dynamic andelectromagnetism tests were carried out on conventional and bionic *** weight, stress, displacement and radar CrossSection (rCS) of both pylons were *** results illustrate that the SSE of bionic pylon is markedly improvedthat specific strength efficiency and specific stiffness efficiency of bionic pylon are increased by 52.9% and 43.6% *** rCS of bionic pylon is reduced significantly.

关键词： lightweight design specific structure efficiency low rCS pylon bionic structure

Bionic Design and Finite Element Analysis of Elbow in Ice Transp.r.ation Cooling System

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Journal of Bionic engineering 2010年第3期7卷 301-306页

作者： Dejun Miao~(1,2), Xiuhua Sui~3, Linjing Xiao~3 1. Key Laboratory of Mine Hazard prevention and Control (Ministry of Education, china), Shandong University of Science and Technology, Qingdao 266510, p. r. china 2. School of Architecture, Tsinghua University, Beijing 100084, p. r. china 3. College of mechanical and Electronic engineering, Shandong University of Science and Technology, Qingdao 266510, p. r. china [a] Key Laboratory of Mine Hazard prevention Control (Ministry of Education China) Shandong University of Science Technology Qingdao 266510 P. R. China [b] School of Architecture Tsinghua University Beijing 100084 P. R. China [c] College of Mechanical Electronic engineering Shandong University of Science Technology Qingdao 266510 P. R. China

With the increase in mining depth, mine heat harm has appeared to be more prominent. The mine heat harm could be resolvedor reduced by ice refrigeration. Thus, ice transp.r.ation through pipeline becomes a critical problem; typically flowresistance occurs in the elbow. In the present study, according to the analysis of the surface morphology of fish scale, abiomimetic functional surface structure for the interior wall of elbow is designed. Based on the theory of liquid-solid two phaseflow, a CFD numerical simulation of ice-water mixture flowing through the elbow is carried out using finite element *** exp.r.ments of pressure drop and flow resistance for both bionic and common elbows are conducted to test theeffect of the bionic elbow on flow resistance reduction. It is found that with the increase in the ice mass fraction in the ice-watermixture, the effect of bionic elbow on resistance reduction becomes more obvious.

关键词： bionic elbow two phase flow ice transp.r.ation flow resistance reduction pressure loss

Mixed boundary conditions for piezoelectric plates

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Science china(physics,Mechanics & Astronomy) 2009年第5期52卷 755-761页

作者： GAO Yang 1 ,XU Sipeng 2 &ZHAO BaoSheng 3 1College of Science,china Agricultural University,Beijing 100083,china 2College of engineering,Ocean University of china,Qingdao 266071,china 3 School of mechanical engineering,University of Science and Technology of Liaoning,Anshan 114044,china College of Science China Agricultural University Beijing 100083 China College of engineering Ocean University of China Qingdao 266071 China School of mechanical engineering University of Science and Technology of Liaoning Anshan 114044 China

For plate bending and stretching problems in piezoelectric materials,the reciprocal theorem and the general solution of piezoelasticity are applied in a novel way to obtain the ap.r.priate mixed boundary conditions accurate to all order.A decay analysis technique is used to establish necessary conditions that the prescribed data on the edge of the plate must satisfy in order that it should generate a decaying state within the *** the case of axisymmetric bending and stretching of a circular plate,these decaying state conditions are obtained explicitly for the first time when the mixed conditions are imposed on the plate *** are then used for the correct formulation of boundary conditions for the interior solution.

关键词： boundary conditions piezoelectric plates mixed data bending problems stretching problems

Boundary conditions for the bending of a piezoelectric beam

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Science china(physics,Mechanics & Astronomy) 2008年第7期51卷 847-856页

作者： GAO Yang1, XU Sipeng2 & ZHAO BaoSheng3 1 College of Science, china Agricultural University, Beijing 100083, china 2 College of engineering, Ocean University of china, Qingdao 266071, china 3 School of mechanical engineering, University of Science and Technology Liaoning, Anshan 114044, china 1. College of Science China Agricultural University Beijing 100083 China 2. College of engineering Ocean University of China Qingdao 266071 China 3. School of mechanical engineering University of Science and Technology Liaoning Anshan 114044 China

For beam bending in transversely isotropic piezoelectric media, the reciprocal theorem and the general solution of piezoelasticity are applied in a novel way to obtain the ap.r.priate stress and mixed boundary conditions accurate to all orders for the beam of general edge geometry and loadings. By generalizing the method developed by Gregory and Wan, a set of necessary conditions on the edge-data for the existence of a rapidly decaying solution is established. The prescribed edge-data of the beam must satisfy these conditions in order that they could generate a decaying state within the beam. When stress and mixed conditions are imposed on the beam edge, these decaying state conditions for the case of bending deformation of piezoelectric beam are derived explicitly. They are then used for the correct formulation of boundary conditions for the beam theory solution (or the interior solution). Besides, an analytical solution of elastic beam is formulated to verify validity of our boundary conditions. For the stress data, our boundary conditions coincide with those obtained in conventional forms of beam theories. More imp.r.antly, the ap.r.priate boundary conditions with two sets of mixed edge-data are obtained for the first time.

关键词： boundary conditions beam bending piezoelectric media decaying states regular states