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CECA is used to identify the key disadvantage of the engineering system, accomplished by building cause - effect chain of disadvantages that link the target disadvantage to its fundamental causes.
· Use of composite materials.
Composite materials can be used to create seals and other components that are both strong and lightweight.
With the combination of principle of composite materials and asymmetry – a new idea was conceptualised wherein the engineering system had final their components that could perform all the desired functionality.
Advanced Materials Research 2013;712–715:2966–9 [6] R.

Experimental Research on Erosion and Corrosion of WC-base Matrix Materials for Drill Bits under Impingement of Drilling Muds Longchen Duan1,a, Anne Neville2,b and Yu Yan2,c 1 Faculty of Engineering, China University of Geosciences, Wuhan, China, 430074 2 School of Mechanical Engineering, Leeds University, Leeds, UK, LS2 9JT a duanlongchen@163.com; ba.neville@leeds.ac.uk; cmenyya@leeds.ac.uk Keywords: Drilling muds, Drill bits, Matrix materials, Erosion and corrosion Abstract.
The composition of the matrix materials is shown in Table 2.
Table 2 Composition of matrix materials NO.
The increase of Ni and WC contents in the studied matrix materials will lower the volume loss of matrix materials.
The contents of WC, as the skeleton materials in the matrix materials, can not surpass the certain limited value, or the impact toughness and bending strength of matrix materials will decrease rapidly.

The Component Analysis of Penetration Sealer Materials Li-Wei Teng1,a, Wei-Ting Lin2,b, Jie Chen3,c, An Cheng3,d and Hui-Mi Hsu3,e 1Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung 202, Taiwan 2Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, Taoyuan 325, Taiwan 3Center for Sustainable Development, National Ilan University, Yilan 260,Taiwan adlwkimo@gmail.com, bwtlin@iner.gov.tw, cjchen@niu.edu.tw, dancheng@niu.edu.tw, ehmhsu@niu.edu.tw Keywords: Concrete crystalline penetration sealer materials (CSM), Water Permeability, C-S-H, Scanning electron microscope (SEM), Energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FT-IR) Abstract.
Pore structure and permeability of cementitious materials.
[4] Han, Y.M., Dong, G.S., Doo, S.C., Construction and Building Materials, Vol. 21 (2007), pp.362-369
[5] Seneviratne, A.M.G., Sergi, G., Page, C.L., Construction and Building Materials, Vol. 14 (2000), pp. 55-59
[9] Mitsuki, Y., Fujimoto, M., Nakamura, Y., “An Enhancement in the Nature of Concrete with a Multiplicative Cement Crystal Type of Concrete Material,” 46th annual meeting of the Civil Engineering Society (1992).

System Development of Processing Functional Gradient Material Part by Laser Rapid Prototyping Qun Qin1,a , Guangxia Chen1,b 1School of Electromechanical and Architectural Engineering, Jianghan University ,Wuhan , Hubei 430056,PR China aqinqunwh@qq.com, bguangxiachen@qq.com Keywords: System development, Functional gradient material (FGM), Part, Laser rapid prototyping, Path planning.
Path planning of FGM area is one key technology of system development because of one path must contain material information of functional gradient material.
Development and application of functional gradient materials.
Metallic Functional Materials, 2000,17(4):15~23 [4] LIN Wensong.
Development of preparation technology of functionally gradient materials.

The solutions of stress singularity of a cracked bi-materials beam under uniform tension and bending were computed.
In the applying research of crack theory, how to make crack quickly is a key problem that meets demand of high efficient production in engineering.
Fig.5 KI with different r/a under bending Fig.6 Relation of KI to depth of crack under bending Conclusions 1) The stress intensity factor of artificial crack with two materials depends on Poisson’s ratio of the two materials and the parameters of specimen.
The stress intensity factors of artificial crack are the similar with the crack of single material, which is shown that the crack formed by two materials can be taken as artificial crack. 2) In the calculation of stress intensity factor of artificial crack with two materials, the singularity of stress depends on the exponent, λ-1, and λ is related not only to the property of the two materials but also to the opening angle of artificial crack.
J Appl Mech, Vol. 30 (1963), p.142 [4] Y.T.Li, C.F.Yan, H.Huang: Materials Science Forum Vols.437-438 (2003), p.309 [5] Y.T.Li, P.Ma, C.F.Yan: Key Engineering Materials Vols.324-325 (2006), p. 503 [6] Y.T.Li, C.F.Yan: Key Engineering Materials Vols.306-308 (2006), p. 7 [7] Y,T,Li , M Song: Acta Mechanica Solida Sinica Vol. 21(4) (2008), p.337 [8] A.Carpinteri, M.Paggi, N.Pugno.

The specialties reform of "Network engineering" is proposed in this paper, and is accordingly pilot.
Master basic knowledge of natural science, training engineering and applied talents in the network engineering field, with the design and implementation of network protocol, network application system design and development, network engineering design, planning and implementation of the system and network management, maintenance and evaluation.
Internet of Things key technology and application [J].
And engineering - concept and frame [J].
Network engineering talent cultivation system research.

Mechanical and fractographic analyses of monolithic Si3N4 ceramics during impact testing Maria Berkes Maros1,a , Nikoletta Kaulics Helmeczi2,b, Péter Arató 3,c and Csaba Balázsi3,d 1 University of Miskolc, Department of Mechanical Engineering, Miskolc-Egyetemváros, Hungary 2 Nanocenter Kft., 3515 Miskolc - Egyetemváros, Hungary 3 Research Institute for Technical Physics and Materials Science of Hungarian Academy of Sciences a metmar@uni-miskolc.hu, bnikoletta.kaulics@nanocenter.hu, carato@mfa.kfki.hu, dbalazsi@mfa.kfki.hu Keywords: engineering ceramics, silicon nitride, instrumented impact test, dynamic fracture toughness, loading rate dependence, fractography Abstract.
Acknowledgement The authors express their thanks for the professional and technical aid given by the Research Institute for Technical Physics and Materials Science, HAS, Hungary, Gyöngyvér B.
Böhme: Impact and Dynamic Fracture of Polymers and Composites ESIS 19, Mechanical Engineering Publications, London, 1995, p. 59
[12] Standard test method for plain-strain fracture toughness of metallic materials ASTM E399-90, Am.
Vol. 5, Materials Research Soc.1989, p. 343.

Crushed Run Rock Subcrust Material and Construction Control Technology Research Liu Zhao-Hui1,a, Sun Xiao-Xiao2,b ,Qin Ren-Jie3,c , Yuan Peng4,d, 1School of Traffic and Transportation Engineering, Changsha University of Science& Technology, Changsha Hunan 410114, China 2School of Traffic and Transportation Engineering, Changsha University of Science& Technology, Changsha Hunan 410114, China 3School of Traffic and Transportation Engineering, Changsha University of Science& Technology, Changsha Hunan 410114, China 4School of Traffic and Transportation Engineering, Changsha University of Science& Technology, Changsha Hunan 410114, China asun870503@163.com,b408226586@qq.com,crjqin@126.com, d53277301@qq.com Keywords: road engineering；crushed runrock； mix design； construction technology Introduction Abstract:In order to settle the influence easily on the foundation soil of high liquid limit red clay by free water in Southern hot and humid regions, and to increase the carrying capacity
The shearing strength of the structural layer mainly depends on the normal stress of the shear plane and the internal friction resistance angle within materials.
The particles and shape of gravel materials need to satisfy certain requirements, which specific requirements should be consistent with the requirements of the table 1.
When loading materials, it is necessary to respectively load the three parts of aggregates in the place of upper, middle and lower so as to avoid segregation
(3) Segregation should be in the charge of specially-assigned person, respectively for adding materials, watering and leveling up or directly digging out for another material

The degradation of paint film of enameled wire belonged to temperature degradation of polymer materials.
[2] SHI Jie, Optimization of Preventive Maintenance Cycle Based on Experimental Feedback in Nuclear Power Plant[J], Nuclear Power Engineering, 2010, 31(6): 106-112
[4] SHI Jie, JIN Xinming, LIU Zhiming et al., “Ageing Assessment, Condition Inspection and Lifetime Evaluation for Safety Related Fuse in Nuclear Power Plant[A]”, Proceedings of the 18th International Conference on Nuclear Engineering ICONE18 May,2010,Xi’an,China
[5] SHI Jie, SHEN Deng-hua, SHIHai-ning, et.al., “Reliability Data Process and Analysis of Instrument and Control switch in Nuclear Power Plant[J]”, Nuclear Power Engineering, 2010, VOL.31, NO.2: p54~57
[7] SHI Jie, Ageing Assessment,Condition Inspection and lifetime Evaluation fot Safety Related Fuse in Nuclear Power Plant[J], Journal of Energy and Power Engineering, Vol.5 No.9, 2011.p892~898.

Assembly process application of Lean Quality Management Moli Sun1,a Xiaochun Zhang2,b 1Department of Mechanical Engineering, Xi’an Aero technical College Xi’an China 710077 2Xi’an University of Technology Xi’an China 710048 amoly.sun@163.com b7787387@qq.com Key words: Assembly process; Quality Management; Resume; Quality defects; Key parts Abstract: The product assembly as the final manufacturing process is one of the most important part, its quality has a major impact on product quality.
Research on quality management, analysis all aspects of quality control around the assembly process, store electronic resume of assembly process, analysis quality defect, forecast and optimize the matching of key parts, which significantly improve the quality of the assembly process of the enterprise performance and business performance.
Optimization of key indicators of quality In the assembly manufacturing processes, the quality problem of the error between the parts can not reach the design requirements, the analysis found that the root of the problem is the assembly manufacturing sector (such as machining, etc.), arising in the course of various quality problems (such as ultra-poor), but taking into account economic factors and processing level, the manufacturing sector need to be resolved in the assembly.
The key steps in implementation include: ① The size of critical components and their identification, measurement, recording ②With the size of the model to calculate the key, and then construct a model of critical parts. ③ According to the model with the critical parts, with the experimental data of key parts, multi-objective optimization using genetic algorithm based on the priorities with algorithms to calculate the required materials, when the secondary units were the key components with the list [4].
Modern Manufacturing Engineering. 2007 (4) :54-57