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(a) Fig.2 Another kind of adiabatic shear band around the penetrated hole It is usually known that the damages of materials have the following forms in mesostructure under the impact load: micro-cracks, micro-bores and adiabatic shear bands [4,5,6].Generally speaking, the micro-cracks and micro-bores are likely to develop around the area where the microstructure is non-homogenous.
The initiation and propagation of the micro-cracks finally result in the damage of the target material.
Journal of Beijing Institute of Technology 2002; 5:595
Progress in Materials Sci., 1983, 28: 1 [6] Dodd B and Bai Y.L.
In: Blazynsik T Z eds., Materials at High Strain Rates, Elesevier Applied Science, London, New York, 1987

Helical milling is a new process of making hole, which originally appear in machining of aeronautical materials. expounded the advantage of helical milling in composite materials and boldly predicted its application prospect in aeronautical assembly process [2].
Koshy and E.Ng: International Journal of Machine Tools & Manufacture Vol. 47 (2007), P. 205~210
Ni: Orbital Drilling of Aerospace Materials (AE Manufacturing and Automated Fastening Conference and Exhibition 2007) [5] Yuan Zhixing: Dynamic Research on Helical Milling (Master Thesis Tianjin University, 2008)
Chen: Kinetics and Experimental Research on Hole Helical Milling for Hard Processing Materials (Master Thesis Tianjin University, 2009)
Ji: Key Engineering Materials Vols.431-432 (2010), P. 346-350

Introduction There is a worldwide research dealing with the development of new materials and with an improvement of their mechanical properties [1].
Except for the enhanced mechanical properties, the researches often try to produce materials with other utility properties, such as antibacterial ones.
These nanofiber-based materials are then used mainly in bioengineering [6] and the Polyvinyl alcohol (PVA) based nanofibers are tested as filters and protection of other materials [7].
For many applications we can use the conventional testing techniques for determination of the mechanical properties of nanofiber-based materials at the macro-scale [8].
Wang, Structure, Corrosion Behavior and Mechanical Property of a Novel Poly(vinyl alcohol) Composite in Simulated Body Fluid, Journal of Biomaterials Science-Polymer Edition. 21 (2010) 863-876

Collect text, picture and video information about the rules of table tennis match PP widely and process it .Use Word, Photoshop, Movie Maker, Author ware etc. for the production of multimedia courseware. 2.3 Expert evaluation method: Interview and communicate with other institute table tennis teachers and computer science experts before making courseware .Consult experts as the reform of the teaching method and the understanding of table tennis’ concept and the difficult of the research and application of the courseware.
Through the multimedia CAI courseware provides vivid, intuitive materials, to stimulate students' association, arouse learners' knowledge in long-term memory, their experience so as to assimilate new knowledge, to cultivate learners' innovation consciousness.
Therefore, when we study the teaching method, the key is to study the content, structure, logical relationship of the teaching material and students' learning methods.
Through various media means, in order to be able to fully reflect the teaching material content in the limited teaching space, on the media design, first of all, not according to the order and structures of teaching materials to produce on a variety of media, but in the study, on the basis of the teaching material content, set up the logical structure of knowledge, in order to certain the key knowledge and learning levels of each chapter, and then we can choose the media.
Full use of computer graphics, images, animations and other features that enables students to develop the right concept of the action of Tennis Forehand Fast Break, to master the main points of the teaching content, to improve students' learning efficiency and to broaden their knowledge. 5.3The production of the courseware materials 5.3.1The production of the text: Making the text includes two aspects.

The Basic Research and Application on Hot Forming of High Strength Steel FuLi Lu1,a, JiShun Song2,b*,Jian Zhang2,c,XiuPing Yan1,d 1Key Laboratory of Display Materials & Photoelectric Devices(Tianjin University of Technology), Ministry of Education,Tianjin300384,China 2School of Materials science & Engineering,Tianjin University of Technology,Tianjin 300384,China alufuru@163.com, blgjs@163.com(Correspondence Author),czhang_jian_99999@126.com, dyanxiupingtjlg@163.com *Corresponding author Keywords: hot forming; high strength steel; process parameters; car stringers Abstract.
Analysis of Material Formability Phase Transformation in Heat Stamping.
We slected 22MnB5 as experimental material.
The thickness of material is 1.5mm and the average of coating thickness is 80g/m2. the microstructure of material is pearlite and ferrite, the tensile strength is about 600Mpa,the hardness is 170~200HV before hot forming.
×1000 ×1000 （b） （a） Fig.11 The microstructure of part after hot forming Conclusions (1) Through the analysis of material formability, in order to make the material fully phase transformation and have plastic deformation capacity and strain hardening in the process of hot forming, we should make material temperature at 700~800 ℃ before molding

Like the other common supplementary materials, the advantages of using SF in concrete are also presented through the two mechanisms, namely pozzolanic reaction and filler effect.
Experimental work Materials.
ASTM C150 type I cement from Taiwan Cement Company and ASTM C1240-03 silica fume from Elkem Materials were used in this research.
Journal of Materials in Civil Engineering. 1994;6(3):357-75
Construction and Building Materials. 2004;18(10):737-43

Test materials and methods Reagents and equipment.
Environmental Science, Vol. 19(1998), p.47-50
(China Environmental Science Press, Beijing 1989)
Environmental Science, Vol. 21(2000), p. 93-96
Journal of Shenyang Jianzhu University (Natural Science), Vol. 22(2006), p. 604-608.

The target index in this aspect chiefly involves C41 material safety and C42 staff responsibility
The weight ranking shows that the most influential factors are material safety, managerial risks, staff responsibility, force majeure and capital risks.
Kunming: Yunnan Science and Technology Press, 2002.7.
Journal of the Eastern Asia Society for Transportation Studies,  5  (2003), p. 2920–2931 [3] C.
Analytic Hierarchy Process [M] the 4th Edition, Science Press,1986.7.

Design and Implementation of Valve Failure Signal Multi-channel Acquisition System Based on Acoustic Emission and Pipeline Ting Feng1,a, Jiande Wu*,1,2,b, Xuyi Yuan1, Yugang Fan1,2, Xiaodong Wang1,2 1Kunming University of Science and Technology, Kunming 650093 2 Engineering Research Center for Mineral Pipeline Transportation Yunnan, Kunming 650500 akingft@126.com, bwjiande@gmail.com Keywords: Acoustic emission; Multi-channel acquisition; Valve failure Abstract.
And because the vast majority of materials have characteristics of acoustic emission, acoustic emission is not so limited by the material[1].
This paper is supported by the foundation items: Project supported by Natural Science Foundation of China (Grant No. 51169007), Science & Research Program of Yunnan province (No. 2010DH004 & No. 2011CI017), Foundation of Kunming University of Science and Technology (No.
Journal of Nanjing Forestry University (Natural Sciences Edition), 29(6):91-94.(2005) [2] PROAKIS John, MANOLAKIS Dimitris G.Digital signal processing (4th Ed.)

Material and Methods Sample collection.
The monthly change of concentration was very obvious in PM2.5 and OC was mainly from fuel combustion including primary organic carbon (POC) from direct emission of combustion source and secondary organic carbon (SOC) from photochemical reactions of organic materials in the air.
Journal of Air & Waste Management Association, 53, 946-956
The Science of the Total Environment, 298, 65-79
Environmental Science and Technology, 40, 3148–3155