Science in China Series E: Technological Sciences

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Characteristic of solid product layer of MgSO4 in the reaction of MgO with SO2
Science in China Series E: Technological Sciences - Tập 53 - Trang 1869-1876 - 2010
ZhenShan Li, Fan Fang, NingSheng Cai
The microstructure, nucleation and growth of MgSO4 product layer during the reaction of MgO Single crystal with SO2 and O2 were investigated with thermo gravity analyzer (TGA) and atomic force microscopy (AFM). The AFM images indicated that three dimensional islands with different sizes were formed during the initial reaction stage. At the initial stage, cone-shaped islands were formed, and most o... hiện toàn bộ
Determination of effective thermal conductivity for polyurethane foam by use of fractal method
Science in China Series E: Technological Sciences - Tập 49 - Trang 468-475 - 2006
Mingheng Shi, Xiaochuan Li, Yongping Chen
The microstructure of polyurethane foam is disordered, which influences the foam heat conduction process significantly. In this paper foam structure is described by using the local area fractal dimension in a certain small range of length scales. An equivalent element cell is constructed based on the local fractal dimensions along the directions parallel and transverse to the heat flux. By use of ... hiện toàn bộ
Design and experimental study of the SPKM165, a five-axis serial-parallel kinematic milling machine
Science in China Series E: Technological Sciences - Tập 54 - Trang 1193-1205 - 2011
FuGui Xie, XinJun Liu, Hui Zhang, JinSong Wang
A five-axis serial-parallel kinematic milling machine, the SPKM 165, is introduced. This machine consists of a three-degree-of-freedom parallel module and a two-degree-of-freedom serial table. The SPKM 165 is capable of five-face machining. A discussion of the inverse kinematics of the five-axis control is provided. A dimensional synthesis procedure is presented in terms of motion/force transmissi... hiện toàn bộ
A novel random phase-shifting digital holographic microscopy method
Science in China Series E: Technological Sciences - Tập 52 - Trang 2048-2053 - 2009
HuiMin Xie, ZhenXing Hu, FuLong Dai, YanJie Li, PengWan Chen, QingMing Zhang, FengLei Huang
This paper proposes a new method that reconstructs the information of specimen by using random phase shift step in digital holographic microscopy (DHM). The principles of the method are described and discussed in detail. In practical experiment, because the phase shifter is neither perfectly linear nor calibrated, digital holograms with inaccurate phase shift step are recorded by the charge-couple... hiện toàn bộ
Monte Carlo simulations of dense gas flow and heat transfer in micro- and nano-channels
Science in China Series E: Technological Sciences - - 2005
Moran Wang, Zhixin Li
Anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature
Science in China Series E: Technological Sciences - Tập 52 - Trang 161-165 - 2009
JinBao Lin, LiMing Peng, QuDong Wang, J. R. Hans, WenJiang Ding
The anisotropic plastic deformation behavior of as-extruded ZK60 magnesium alloy at room temperature (RT) was investigated by compressive and tensile testing in different directions, i.e. the loading axis oriented at 0°, 45° and 90° to the extrusion direction. The relationship between texture and plastic deformation behavior were examined. The results show that the extruded ZK60 alloy exhibits a s... hiện toàn bộ
Recent progress in thermodynamics of radiation—exergy of radiation, effective temperature of photon and entropy constant of photon
Science in China Series E: Technological Sciences - Tập 51 - Trang 1096-1109 - 2008
ZeShao Chen, SongPing Mo, Peng Hu
The recent progress on thermodynamic properties of spectral radiant energy in the field of thermodynamics of radiation is reviewed. The effective temperature of photon T λ representing the energy quality of photon is introduced. The relation between T λ and the wavelength λ is given as λT λ =c 3=5.33016×10−3 m·K. The entropy constant of photon is given as s λ =3.72680×10−23 J/K. The exergy, entrop... hiện toàn bộ
Influence of growth pressure of a GaN buffer layer on the properties of MOCVD GaN
Science in China Series E: Technological Sciences - - 2003
Jun Chen, Shuming Zhang, Baoshun Zhang, Jianjun Zhu, Feng Ge, Li Duan, Yutian Wang, Hui Yang, Wenxu Zheng
Analysis of the constraint relation between ground and self-adaptive mobile mechanism of a transformable wheel-track robot
Science in China Series E: Technological Sciences - Tập 54 - Trang 610-624 - 2011
ZhiQing Li, ShuGen Ma, Bin Li, MingHui Wang, YueChao Wang
To maneuver in unstructured terrains where the ground might be soft, hard, flat or rough, a transformable wheel-track robot (NEZA-I) with a self-adaptive mobile mechanism is proposed and developed. The robot consists of a control system unit, two symmetric transformable wheel-track (TWT) units, and a rear-wheel unit. The TWT unit is the main mobile mechanism for the NEZA-I robot, with the rear-whe... hiện toàn bộ
Wafer bonding technique used for the integration of cubic GaN/GaAs (001) with Si substrate
Science in China Series E: Technological Sciences - Tập 45 - Trang 255-260 - 2002
Yuanping Sun, Fu Yi, Qu Bo, Wang Yutian, Feng Zhihong, Shen Xiaoming, Zhao Degang, Zheng Xinhe, Duan Lihong, Li Bingchen, Zhang Shuming, Yang Hui, Jiang Xiaoming, Zheng Wenli, Jia Quanjie
We successfully used the metal mediated-water bonding technique in transferring the as-grown cubic GaN LED structure of Si substrate. The absorbing GaAs substrate was removed by using the chemical solutions of NH4OH:H2O2=1:10. SEM and PL resuls show that water bonding technique could transfer the cubic GaN epilayers uniformly to Si without affecting the physical and optical properties of epilayers... hiện toàn bộ
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