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| 1 | SYNTHESIS OF ULTRAFINE PLZT POWDER BY A SIMPLE CO-PRECIPITATION METHOD显示文摘Starting from cheap inorganic salts , ultrafine P L Z T po w ders were synthesized by a co pre cipitation m ethod . The results show that the precursor precipitate obtained by the co precipita tion method transfor ms co m pletely to P L Z T phase by calcining at 420 ℃ for 4 hours , about300 ℃low er than the nor m al transform ation te m perature of P L Z T obtained by m ixed oxidemethod . The effect of residual N H4 N O3 in the precursor precipitate on transfor m ation te m perature of the P L Z Tpow der w as investigated . The residual N H4 N O3 in the precursor po w der can reduce further the P L Z Ttransfor m ation tem perature to about 300 ℃, but a sm alla mount of Zr O2 and Pb Ti O3 re m ained . By a proper control of the synthesizing route , a P L Z T po w der with a pri m ary particle size of 10 n m and an agglom eration size of 0 3 μm hasbeen produced . | H. Ying1) , X. D. Sun1) , Q. B. Yang1) , J. B. Li2) , Y. M. Wang2) , Z. Zhang3) and J. You3)1) School of Materials and Metallurgy , Northeastern University , Shenyang 110006 , China2) Departm ent of Materials , School of Mechani | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 10 |
| 2 | WAVE EQUATION MODEL FOR SHIP WAVES IN BOUNDED SHALLOW WATER显示文摘Ships were modelled as moving pressure disturbances on the free surface of a shallow water basin in the present paper. The moving pressure generating waves were subjected to the reflection of land boundaries and the radiation of open boundaries. This paper proposed and examined a wave equation model (WEM) to solve the shallow water equations with moving surface pressures simulating ship waves in a bounded shallow water region. The Galerkin finite element method was used to solve a second order wave equation for the free surface elevations and the hydrodynamic pressure of the ship bottom simultaneously. Horizontal velocities were obtained from the momentum equations. Numerical solutions of Series 60 C B=0.6 ships moving with the depth Froude number of F h= 0.6, 1.0, 1.3 in a rectangular shallow water harbor were investigated. Three dimensional surface elevation profiles and the depth averaged horizontal velocities were analysed. The numerical results characterised very well the ship waves in shallow water. Strong boundary reflection waves were found in the case of high depth Froude number (F h=1.3). Waves generated by the interactions of two ships moving in the same directions and in the opposite directions were also numerically investigated in the present study. | T.S.Lee Mechanical & Production Engineering Department, National University of Singapore, Singapore 119620 Wu Jian kang, Xiong Chuan guang Mechanics Department of Huazhong University of Science & Technology, Wuhan 430074, P.R.China C.Shu Mechani | 2000 | Journal of Hydrodynamics2000，12，4： | 4 |
| 3 | 显示文摘 | WANG Guiying a b YAN Guoqing a b YANG Jie a b WANG Wenqi a b TANG Yonggang a b SONG Qixiang a b ZHANG Mingyu a b and PENG Zhensheng a c a Anhui Key Laboratory of Spintronic and Nanometric Materials(Cultivating Base) Suzhou 234000 China b School of Mechani | 2012 | Rare Metals2012，，04： | 1 |
| 4 | cal Alloying and Its Consolidition显示文摘 | Munoz-Palos J M Cristina M C Aedva E Synthesis of Mg2Si Powder by Mechani | 1996 | Mater Trans1996，37，10： | 1 |
| 5 | 镍钛形状记忆合金的变形性能与马氏体及R相转换的相关性显示文摘为描述TiNi形状记忆合金马氏体式转换和R相转换引起的形状记忆效应和伪弹性,在综合考虑与上述两个变化相关的诱导相体积变化的基础上,推导了一个热力学本构方程。该方程能很好地表达形状记忆效应,伪弹性和回复应力。 | Pinghua Lin Hisaaki Tobushi Akira Ikai Kikuaki Tanakan(Department of Mechanical Engineering,Southeast University,Nanjing)(Department of Mechaniical Engineering, Aichi Institute of Technology Yagusa-cho, Toyota,Japan)(Department of Aerospace Engineering, T | 1995 | 医用生物力学1995，10，2： | 0 |
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