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Key protecting strata criterion.
The fractured span of each stratum may be evaluated with the fixed-end beam mechanics model of material mechanics as shown in Fig. 1.
Firstly, the advanced distance reach formula（1）, called intension term of key protecting stratum.
The rock stratum is called key protecting strata of water conservation mine.
[4] Chunan Tang, Zenghe Xu, Xiaohe Xu.LiaoNing University of Engineering Technical Transaction.Vol.18 (5)（1999）,p.456~458. in chinese

Materials science is a key field in science and technology, and is indispensable for providing the groundwork for the next technological generation.
The collection comprises 64 papers from various researchers in the fields of ceramics and related materials.
Fundamental aspects, synthesis and processing, functional ceramics, engineering ceramics, micro/nano structures, and various applications are extensively discussed.

Although composite materials mould has low manufacturing cost, and openning mould spents less time, but its thermal expansion coefficient is small, and it is easily damaged.
It is applicable to all kinds of hard or soft materials.
A quick method of mould surface design based on reverse engineering is proposed.
[2] Wei Fu, Hai Zhang: Tool Engineering Vol. 41(2007),p.1-4,in Chinese
[5] Ping Xi, Xiaoxia Sun: Journal of Engineering Graphics Vol. 3(2009),p.1-5,in Chinese.

Innovation Design in Machine Theory for Mechanical Engineering Education Jian Guo Qiang School of Mechano-Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050,China qiangjianguo@lut.cn Keywords: Machine Theory; Innovation Design Practice; Mechanical Engineering Education Abstract.
In order to improve the quality of education and develop innovation education, the Ministry of Education of China has implemented a higher engineering education content and curriculum reform plans, and built some bases of engineering courses.
Significance of innovation design practice for mechanical engineering education.
(3) Function requirements and key problems A detailed description of function requirements and key problems for the design subjects
High Engineering Education and Research vol. 2(2007), p.1.

Then getting surface of the measured material object, thus the measured material object is measured automatically.
To get the interferogram with information of measured material object base on the principle of interferometry[6].
Wave surface of measured material object could be restored by 2D-IFFT and phase unwrapping after the steps.
Region spreading is the key step of interferogram preprocessing.
Vol. 30(2009), p. 76 [3] Ge Jin-man, SU Jun-hong: Infrared And Laser Engineering.

Experimental Research on Ultrasonic Lapping AI2O3 Engineering Ceramics Using Fixed Oilstones G.F.
Kong 1,d 1 College of Mechanical Engineering, Tongji University, China 2 Dept. of Mechanical Engineering, Henan Polytechnic University, China agaogf@hpu.edu.cn, bzhaob@hpu.edu.cn, clcs@hpu.edu.cn, dkongqh@sh163.net Keywords: Fixed grains, Ultrasonic lapping, Material removal rate, Surface roughness, Engineering ceramics Abstract.
However only those with the higher dimension precise and better surface quality can satisfy the needs for engineering.
In 1988, Professor Bifano put forward a new idea about ductile grinding of brittle materials, in which the in-feed rate was taken into accounts[8].
In 1996 Professor Malkin discussed the cutting force and microstructure during the study of lapping mechanism of engineering ceramics[11].

Fabrication of SS316L/Ni25 Functionally Gradient Materials using Laser Engineered Net Shaping Dongjiang Wua, Xiaokang Liang, Qian Li, Lijia Jiang Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian Liaoning 116024, PR China adjwudut@dlut.edu.cn Keywords: LENS, FGM, SS316L, Ni25,Microstructure Abstract: Functionally gradient materials(FGMs) were successfully fabricated with compositions gradually changed from 100% stainless steel 316L to 100% Ni25 alloy using laser engineered net shaping(LENS) technology.
Introduction Since the mid-1980s, the processing of Functionally Gradient Materials(FGMs) and structures has become an academic interest.
Watanabe: Engineering Fracture Mechanics Vol. 69 (2002), p. 1713-1728 [2] G.P.
Mazumder: Materials Science and Engineering A Vol. 509 (2009), p. 98-104 [3] Q.X.
Huang: Materials Science and Engineering A Vol. 391 (2005), p. 325-336 [5] M.L.

In view of confusion phase of reinforcement philosophy and method in existing engineering structure now, the paper analyses wreck of existing engineering structure as a result of the earthquake, put forward “Degree of Monolithic Secure” thought and probe into its application in aseismic strengthening of existing engineering structure.
The principle of “Degree of Monolithic Secure” of building and civil engineering structures on the basis of the understanding of the mechanics, structures, materials and equipment faction, comprehending of the design, construction, use and practice, and obtaining some fundamental request through summarize experience in strengthening on the long term project epoch, all these have important guide to the Degree of Monolithic Secure.
To lessen own weight can take the following measures: a). using the lightweight high-strength materials, such as lightweight aggregate concrete, and plastic products; b). choosing the reasonable structural arrangement. 5) The principle of deformation coordination. strengthening the building and civil engineering structures in “Degree of Monolithic Secure”, should as far as possible coordinate the deformation of every structural member.
The seismic strengthening for engineering technology on the basis of conception structural ductility problem in earthquake engineering.  
Journal of Structural Engineering, Vol.123(1997).p.11-19

Key Laboratory of Advanced Textile Composites (Tianjin Polytechnic University), Ministry of Education, Tianjin 300160, China ae-mail: gongjixian@126.com Keywords: Evolutionary engineering, Biodegradation, Terephthalic Acid (TA) Abstract.
Evolutionary engineering is a novel whole-genome wide engineering strategy inspired by natural evolution for strain improvement.
Introduction Evolutionary engineering is a novel whole-genome wide engineering strategy inspired by natural evolution for strain improvement.
Materials and methods Strains and medium.
This indicated that the high pH resistant strains were obtained through evolutionary engineering.

Empirical research on a tunnel engineering project verified its practicability and feasibility, providing a new powerful tool for assessing project duration risk in the network diagram quickly.
Introduction Network planning technique[1] was an important modern management technology, finding out the key activity, the critical path and the shortest project duration by analysis and achieving resource balance such as people, money, materials by adjustment and optimization to meet the need, to be an effective method of a large engineering project schedule management.
tunnel lines 7,9,11 U(64,82.5) 17 pavement and drainage engineering in 1#, 2# cut-and-cover tunnel lines 16 N(130,34.8)[112,148] 18 1# tunnel grouting works 12,13 T(97.5,131,154) 19 2# tunnel import portal excavation 14 N(62,16.1)[52,79] 20 2# tunnel grouting works 14 T(42,63.5,83) 21 2# tunnel export lining 15 T(96,108.9,117) 22 2# tunnel pavement and drainage engineering 15 N(92,25.8)[79,111] 23 pavement and drainage engineering in 2# tunnel export 19 T(31,44.5,55) 24 project completion acceptance 17,18,20,21,22,23 U(5,8) remark: c(a) was a constant distribution with parameter a to be constant.
References [1] JGJ/T121-1999 Technical specification of engineering network planning[S].
Journal of Construction Engineering and Management, December, 1996: 308-317