n Asian organization of over 5,000 staff employs a Performance Management System that is tied to
Asia International Open University, School of Graduate Studies
A simple analytical model for performance analysis of IEEE 802.11 WLAN under un-ideal condition is
State Key Laborotary of Integrated Services Networks, Xidian University
performance of a plate fin-and-tube heat exchanger surface with radially positioned slots. The problem is of
School of Energy & Power Engineering,Xi’an Jiaotong University,School of Energy & Power Engineering,Xi’an Jiaotong University,School of Energy & Power Engineering-Xi’an Jiaotong University
IEEE 802.11 includes two medium access control (MAC) protocols, a basic distributed coordination function and an optional point coordination function (PCF). PCF is a polling-based MAC protocol able to support collision free and time bounded services. However no suitable PCF analytical model is presented now. A simple, but extremely accurate, analytical model is presented in this paper to compute the system throughout. Simulation results show that the model is valid.
State Key Laboratory of Integrated Services Networks, Xidian University
the preparation of the membrane to toughen the structure of nano-composite membrane. Performance of
College of Food Science, South China Agricultural University, Department of Agrobioscience, Paul Sabatier-Toulouse Ⅲ,College of Food Science, South China Agricultural University,College of Food Science, South China Agricultural University
’ performance, three dimensional flow field calculation of two forebodies integrated with hypersonic inlet was
School of Power and Energy,Northwestern Polytechnical University
Based on Dowson-Higginson equation, this article obtains minimum film thickness of smooth tooth surface in meshing process. From the beginning of meshing process to its disengagement, the minimum film thickness increases gradually .its inflection point appears between the double teeth-meshing area and the single teeth-meshing area, and its maximum appears when the contact point closes the root of face gear. Using shaper to machine face gear with different module and pressure angle, it analyses backlash for the best minimum film thickness. According to the effect of grinding method to surface topography, the minimum film thickness correction factor is recommended, this paper analyzes minimum film thickness of lubrication in the tooth surfaces considering diverse rough surface. In the range of computing roughness, the minimum film thickness increases while surface roughness increases. The contact point near root in grinding wheel has maximum surface pattern parameter, and the minimum film thickness of this point has the least variation.
the Ph.D. Programs Foundation of Ministry of Education of China （No. 20120162110004）
State Key Laboratory of High Performance Complex Manu-factoring, Central South University, Changsha
n Asian organization of over 5,000 staff employed a Performance Management System that was tied to
The oxide-dispersion-strengthened (ODS) ferritic alloy powders were prepared by mechanical alloying (MA) at a high rotation speed of 720 rpm for 24 h. All the elements were mixed homogenously in the powders, and Cr and Al dissolved in α-Fe after MA. The bulk samples were produced by spark plasma sintering (SPS) at 950 ℃ and 50 MPa and by hot isostatic pressing (HIP) at 1150 ℃ and 130 MPa, respectively. The sample prepared by SPS showed a tensile strength of 730 MPa and a poor ductility due to the existence of pores in microsize. The sample prepared by HIP had a high tensile strength of 980 MPa, yield strength of 710 MPa and elongation of 10.3 %. The excellent mechanical properties of ODS alloy by HIP was due to the small grain size of the matrix of about 400 nm and the fine oxide particles of 5-40 nm.
the Aeronautical Science Foundation of China（No. 2011ZF51065）
The authors acknowledge the support of this work by MOST of China （No. 2011AA03A408）
the Fundamental Research Funds for the Central Universities （No. YWF1102212）
the Specialized Research Fund for the Doctoral Program of Higher Education（No. 20091102120009）
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials
complex obstacle cases including both convex and concave polygon obstacles with good length performance
Tsinghua University,Tsinghua University,Tsinghua University,Institute of Applied Mathematics-Chinese Academy of Sciences,Tsinghua University,Institute of Applied Mathematics-Chinese Academy of Sciences,Institute of Applied Mathematics-Chinese Academy of Sciences