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In highway pavement engineering, mineral aggregate gradation is a key consideration in mixture design.
Acknowledgement This material is based in part upon work supported by Guangxi Key Lab of Road Structure and Materials.
Geotechnical Engineering State of the Art and Practice: 187-220
Journal of Engineering Mechanics, 2009. 135(4): p. 324-333
Journal of Computing in Civil Engineering, 2009. 23(6): p. 340-347.

This special collection provides up-to-date knowledge concerning the field of functional materials such as shape memory alloys, piezoelectric ceramics and aluminium alloys.
The articles therein also deal with recent investigations of quasicrystals and geopolymers: two classes of hybrid material that have attracted great scientific interest, given their unusual properties and potential engineering applications.

In the first part, the papers address key issues concerning the application of two classes of functional alloy: (i) NiTi alloys, having important applications in the fields of smart structures and bioengineering; and (ii) CuAlBe alloys, as applied to non-welded pipe joints.
In the second part, three articles deal with two hybrid materials: quasicrystals and geopolymers.
The latter is a class of inorganic polymers produced from raw material originating from industrial by-products of, for example, the thermoelectric and steel industries.

Current Development of Key Materials for Low Temperature Fuel Cells Jun Zhanga, Ying-li Zhub*, Gang Qi and Jian-yu Li Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, China a1176902986@qq.com, b*zhuyingli@tust.edu.cn Keywords: Low temperature fuel cells, Electrolyte, Catalyst, Electrode Abstract.
In this paper, the key materials of the three types low temperature fuel cells are introduced, and the most recent advances related to the key materials and their character are reviewed.
This paper reviews the recent work done in the key materials of the low temperature fuel cells.
Catalyst materials.
Key materials play an important role in the performance of fuel cell systems.

Many early documents are simply descriptive, but the curiosity of some key scientists and engineers was aroused.
Scientific or engineering explanations for the observed patterns gradually were developed.
The key scientists, engineers, and analysts who contributed to our field are shown in Fig. 1.
This is a classic engineering problem.
Richerson: Modern Ceramic Engineering, Marcel Dekker Inc., NY, 1982

Fracture Design of Metallic Matrix Crack for Bi-materials Youtang Lia , Changfeng Yanb College of Mechano-Electronic Engineering, Lanzhou University of Technology, Lanzhou 730050, China a liyt@lut.cn, byangcf@mail.lut.cn Keywords: Fracture, Matrix Crack, Metallic materials, Dynamics Abstract.
The result lays a theoretic and applied foundation for the practical engineering application of metallic matrix crack for bi-materials.
In the application of crack theory, how to make crack quickly is a key point that meets demand high efficient production in engineering.
The result lays a theoretic and applied foundation for the practical engineering application of metallic matrix crack between bi-materials.
R43~R46 [4] Y.T.Li, Y.B.Wei and Y.F.Hou: Key Eng.

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

Research on Remote Optimization System for Key Parts of Large Scale Plastic Mold Meng Chen1,2,a , Caowei Chen1,b , Longshan Wang2,c, Yaping Lu1,d and Lei Zhang2,e 1The Institute of Mechanical Engineering, Ningbo University of Technology, China 2The Institute of Mechanical Science and Engineering, Jilin University, China achenmeng666666@163.com, bchcw_003@163.com, cLswang@jlu.edu.cn, dluyaping@nbut.cn ezhanglei0440118@163.com Keywords: Remote optimization, Plastic mold, ASP.NET, ANSYS Abstract.
A remote finite element optimization system for key parts of large scale plastic mold is described.
The system can query material properties of the mold, such as modulus of elasticity and Poisson's ratio from the material parameters query system.
systems, Journal of computer Information Science in Engineering , ASME, 2001 [10] Special issue of Computer-Aided Design Journal Shape Similarity Detection and Search, for CAD/CAE Applications.
Computer-Aided Design Volume : 37，Issue : 11, September 15, 2005 [11] Nagashima,Toshio, Development of a CAE system based on the node-by-node meshless method, Computer Methods in Applied Mechanics and Engineering, 2000.

Based on the engineering archives management to promote engineering safety, quality, cost, schedule, and information management.
Even through electronic means for file storage because of the lack of the corresponding management system platform needs to spend a lot of manpower and material resources problem, the high cost of archives management.
Based on the engineering archives management to promote engineering safety, quality, cost, schedule, and information management.
Research and development of technology route To obtain the geographical information sharing data and construction of geographic information platform WEBGIS, in geographic information database to enter the region traffic engineering information such as: highway network information and large bridge node as well as a key project information, and in the WEBGIS geographic information platform to be labeled; in regions of each project based on C / S architecture for traffic engineering file management system, and connected to the Internet network; in the regional administrative center building traffic engineering archives, equipped with large-scale server or workstation, configuration professional traffic engineering file management system personnel, on the inside area of traffic engineering archives for real-time management and evaluation, and regularly check the engineering archives of reporting, and timely provide engineering archives schedule real-time work state, for decision-making provide
Summary To obtain the geographical information sharing data and construction of geographic information platform WEBGIS, in geographic information database to enter the region traffic engineering information such as: highway network information and large bridge node as well as a key project information, and in the WEBGIS geographic information platform to be labeled; in regions of each project based on C / S architecture for traffic engineering file management system, and connected to the Internet network; in the regional administrative center building traffic engineering archives, equipped with large-scale server or workstation, configuration professional traffic engineering file management system personnel, on the inside area of traffic engineering archives for real-time management and evaluation, and regularly check the engineering archives of reporting, and timely provide engineering archives schedule real-time work state, for decision-making provide auxiliary information.

Bone Trabecula Surface Reconstruction for Cranium Scaffold in Bone Tissue Engineering ZHENG Shuxian1,a, LI Jia2,b and GONG Zhenhua3,c 1 Tianjin Key Laboratory of Equipment Design and Manufacturing Technology, Tianjin University, Tianjin 300072, China 2Tianjin Key Laboratory of Equipment Design and Manufacturing Technology, Tianjin University, Tianjin 300072, China 3Tianjin Key Laboratory of Equipment Design and Manufacturing Technology, Tianjin University, Tianjin 300072, China asxzheng@tju.edu.cn, bjli@tju.edu.cn, cgongzhenhua@163.com Keywords: Tissue engineering, Cranium, Bone Trabecula, Surface reconstruction, Scaffold fabrication Abstract.
Such as bone source is limited, or bear the risk of pathogens transmission, rejection, or the substitute materials lack of biocompatibility and bioactivity, etc.
Recently, bone tissue engineering has shown great advances for cranioplasty [1,5].
As a carrier for cells, porous scaffold is at the heart in bone tissue engineering.
Subsequently, reverse engineering technology is used to reconstruct the micro bone trabecula surface.

Seven typical engineering ceramic materials are analyzed using the method, the objective and comprehensive results are gained.
Introduction Grindability is a key index for ceramic materials grinding.
The evaluation results of workability of ceramic materials are objective, stable and reasonable using this method, it can be applied as a valid refrence to design ceramic materials and select machining parameters of ceramic materials.
[5] Yu A B, Chen Y, Jia DW: Key Engineering Materials.
Zhong , Xin Li Tian: Materials Science.