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Increase students’ retention of the material they have been taught 7.
Facilitate testing of conceptual material 10.
Because various variables of teaching maybe affect the teaching results, such as teachers(engagements, familiar to teaching materials, teaching style, teacher-students connection et al.); students’ background; teaching process(teaching method and materials et al.); assessment methods and tool.
San Francisco：Pearson Education，2005 [3] Clyde Freeman Herreid, “clicker” cases: Introducing case study teaching into large classrooms, Journal of College Science Teaching, Vol. 63,No.2,Octobor 2006:43-47 [4] T.
American Journal of Physics, 76(11), 1066-1069

Research on Quality Control Flows and Techniques of Software Project Management Yongchang Ren1,a, Deyi Jiang2,b, Tao Xing3,c, and Ping Zhu1,d 1College of Information Science and Technology, Bohai University, Jinzhou, P.R.
The results show that, through the study of quality control flows and techniques provide techniques and methods to support quality control and improve the science of quality management.
Through the research of quality control flows and techniques support techniques and methods to quality control, to improve the science of quality management.
Acknowledgment This work is supported by Innovation Team Program of Beijing Academy of Science and Technology (IG201106N), Education department of liaoning province key laboratory fund project (2008S002) and Liaoning doctoral fundation (20091034).
(In Chinese) [4] Yu FM: Journal of Weifang Educational College, Vol. 9 (2008) No.3, p.39.

Therefore, the solidification modes for austenitic stainless steel materials can be austenitic or ferritic.
Park: Journal of Materials Processing Technology 113 (2001), 234-237
Costa, Luı´sa Quintino, Martin Greitmann: Journal of Materials Processing Technology 141 (2003), 163-167
Peix: Materials Science and Engineering A363 (2003) 40-52
Wallace: Journal of Materials Processing Technology 171 (2006) 188-204

Acknowledgment The authors gratefully acknowledge the finacial support in part by GuangDong Science & Technology Department under grant number 2009B090300044.
[2] Toshihiko MORI, Suyang LI, Journal of the Japan Society for Precision Engineerging, 72(3), 2006, p. 337-341
[4] Chang-Chun Zhou, Guo-Fu Yin, Xiao-Bing Hu, Materials and Design, 30(2009), p. 1209-1215
Rezaie, Journal of Materials Processing Technology, 209(2009), p. 1920-1935
[6] Siamak Serajzadeh, Materials Science and Engineering, A 472(2008), p. 140-147.

Cemented carbide D20 and cold tool steel SKD11 were selected as the test materials.
Workpiece material: D20 b.
For the two kinds of materials, the surfaces finished with conventional WEDM have significantly poor straightness.
Workpiece material: SKD11 Fig.5 Results of surface roughness Material Removal Rate.
Workpiece material: D20 b.

Introduction Al-Sn alloys are used as bearing materials because of their unique combination of desirable characteristics, including excellent wear-resistance, good corrosion-resistance, as well as low density and good thermal characteristics.
Thermal expansion behavior is an important physical property of Al-Sn alloys as friction materials.
Zhang: The Chinese Journal of Nonferrus Metals, Vol.7(1997), p. 110-113 [3] J.J.
Korkut: Materials Science and Technology Journal, Vol. 20(2004), p. 73-81 [6] M.A.
Edris: Materials Science and Technology Vol. 19(2003), p. 1531 [7] E.A.

Materials and Methods Participants.
Experimental Variables Initial Speed 4.8 m/s Initial Ankle Angle 5.23° Plantarflexion Initial Plantar-Ground Angle 6.42° Peak Ankle Moment 2.69 Nm/kg Peak Ankle Joint Force 27.94 N/kg Peak MPJ Force 8.09 N/kg Peak GRF 3.44 BW Contact Time 0.161 s All materials, except for the encapsulated soft tissue, skin and plantar fascia, were assumed to be isotropic and linear elastic materials, and their properties were obtained from prior research.
All materials, except for the encapsulated soft tissue, skin and plantar fascia, were considered to be linear elastic materials.
The elasticity of a material was represented by the selection of two material constants, namely Young's modulus (E) and Poisson's ratio (v).
Bonifasi-Lista, Ligament material behavior is nonlinear, viscoelastic and rate-independent under shear loading, Journal of Biomechanics. 35 (2002) 943-950 [29] Z.

Journal of Manufacturing Science and Engineering, Vol.123(2001) ,p.258 [2] LOU Hua-zhou, STELSON K A.
Journal of Manufacturing Science and Engineering, Vol.123(2001) ,p.266 [3] Y.N.
Yu, Gang Feng Liu.Applied Mechanics and Materials.Vol.10(2008), p.172 [4] Y.
Liu.Key Engineering Materials.
International Journal of Minerals, Metallurgy and Materials, Vol.16(2009),p.200

Introduction In the 21st century, whiskers are one of the most innovative products in materials science and materials industry.
Experiment Raw materials.
All the raw materials including PE, PP and ABS are purchased in the local market.
[2] Shengpeng Liu, Jun Cheng and Kaijun Tan:Journal of Wuhan Institute of Technology.
Yang: Materials and Manufacturing Processes. (2006),P 195

Enhanced Two-photon 3D Optical Storage in a Novel Multibranched-dye Doped Photobleaching Polymer Fuquan Guo1, a, Ji Hu1, Bin Guo2 and Hao Liang3 1Department of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang, Henan, 471023, China 2Department of Chemistry and Materials, Nanjing Forestry University, Nanjing,Jiangsu, 210037, China 3Department of Chemical Engineering, Huizhou University, Huizhou, Guangdong, 516007,China afqgzl@163.com Keywords: Two-photon absorption, 3D optical storage, Multibranched-dye, Photobleaching Abstract.
Organic dye-doped polymer materials are of particular importance in data storage system for their fast access speed and low cost.
Practical nonlinear optical devices need solid nonlinear materials for a certain purpose.
Zhang: Journal of Optoelectronics and Advanced Matericals，Vol. 9(2007)，p. 2152 [7] F.
Huang: Chinese Journal of Lasers, Vol. 38( 2011), p. 1106001