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Highway engineering tender price control is the maximum limit of the construction cost.
Particularly be familiar with the instructions to bidders in the tender documents, the terms of the contract, bill of quantities and the relevant content in reference materials.
Master the real price of labor, materials, equipment of the project location, investigate the material distribution to determine the ex-factory price, distance, freight, etc., research development trend of the market inflation, where the project is located, determine the cost of risk.
Summary Key factors of the compilation of bidding price control is verifying of engineering quantity of construction drawing on the basis of fully familiar with drawings, determining the feasible construction scheme, considering its consists of several quotas of a bill of quantities, determining the reasonable price of labor, material, machine.
Beijing: China building materials industry press, 2010.

Study on Tissue Engineering Scaffolds of Silk Fibroin-Chitosan/nano-Hydroxyapatite Composite Guangwu WEN 1, a, Jing WANG 1, 2 , Muqin LI 2 , Xiangcai MENG 2 1 School of Material Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China; 2 Provincial Key Laboratory of Biomaterials, Jiamusi University, Heilongjiang Province, 154007, China a. sdycwjyxd@163.com Key words: SF-CS /n-HA composite; Porosity; Morphology; Tissue engineering Abstract: The porous scaffolds of silk fibroin-chitosan /nano-hydroxyapatite (SF-CS / n-HA) were fabricated through the freeze- drying technique.
Studies suggest the feasibility of using SF-CS /n-HA composite scaffolds for bone tissue engineering.
Introduction The ideal scaffolds for bone tissue engineering should combine excellent cellular affinity, the time-space matching charter of the degradation disappearance of materials and new tissues construction, certain mechanical strength and a three-dimension highly porous microstructure with interconnected pores.
Chitosan is an kind of positive charge alkaline amylose with good biocompatibility and a fast in vivo degradation rate, but poor cellular affinity make it unsuitable as the scaffold of bone tissue engineering alone [4].It was demonstrated that SF had a greater potential for application of clinical repair, tissue engineering and modified materials with a series of excellent characteristics including the same cellular affinity as collagen, good mechanical toughness and minimal inflammatory reaction.
Materials and Methods SF-CS / n-HA (containing 50wt% n-HA) composite powders were synthesized in our laboratory.

Determination of Capto C5 shank’s key dimensions Shi Xiang-yun1,a ，Jiang Hong2 ，Zhou Hong-da1 ，Wang Shu-lin1,b 1School of mechanical engineering, Jiangsu University, Jiangsu Zhenjiang，China 2Jingdezhen product quality supervision and inspection institution，Jingdezhen，China asxyun1988@163.com, bwangsl@ujs.edu.cn Key words: Capto shank; Key dimension; Finite element; Radial stiffness Abstract: Capto shank is widely used in high speed machining, especially in Turning/Milling center.
CTETRA(10) element is chosen in the model. 40CrNi2Mo (material mark: AISI4340) is chosen as the material of shank and spindle.
So taper of shank is one of our key dimensions.
It could achieve non-slipping torque transmission without driving key and eliminate the dynamical balancing problem because of driving key and key way.
Then e is one of the key dimensions that we want to find.

Defect Engineering in Antimony Telluride Phase-Change Materials Yong Wang1,3,a*, Kun Ren2,b, Sannian Song3,c and Zhitang Song3,d 1State Key Laboratory of Functional Materials for Informatics, Laboratory of Nanotechnology, Shanghai Institute of Micro-System and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China 2Hangzhou Dianzi Univ, Coll Mat and Environm Engn, Hangzhou, Zhejiang 310018, China 3University of Chinese Academy of Sciences, Beijing 100049, China aczwy@mail.sim.ac.cn, bkun.ren.nick@outlook.com, csongsannian@mail.sim.ac.cn, dztsong@mail.sim.ac.cn Keywords: Sb2Te3, phase change memory, defect engineering, ion irradiation Abstract.
Conclusions In summary, ion implantation is a uniquely suited strategy for defect engineering of the PCM.
Taubner, Phase-change materials for non-volatile photonic applications, Nat.
Strain engineering and one-dimensional organization of metal-insulator domains in single-crystal vanadium dioxide beams, Nat.
Ultralow-power switching via defect engineering in germanium telluride phase-change memory devices, Nat.

Introduction With the improvement of cable properties, progress of method and prestressed construction technology, prestressed steel structure has become one of the most dynamic and potential structural system in modern structural engineering.
The shape of top steel beam is H-shaped, Q345B; the shape of brace rod is circle steel pipe, Q235B; the material of lower cable is two 55round wire.
Assuming that materials are ideal elastic-plastic and taking the 1/400 of the string beam span as the limit maximum displacement for, the corresponding limit state equation is got as follows: (7) Where is the maximum allowable displacement, is the maximum displacement of structure in the work state, is the short span of structure.
[2] Zhihua Chen, Yang Li: International Journal of Space Structure Vol. 20 (2005) , p.115 [3] Zhansheng Liu, Zhihua Chen: Advanced Materials Research Vol. 97-101 (2010) , p. 4415 [4] S.
Kitipornchai,Wenjiang Kang,Heung-Fai Lam,F Albermani: Journal of Constructional Steel Research Vol. 61 (2005) , p.764 [5] Kawaguchi M, Abe M, Totemic I: IASS Vol. 40 (1999) , p.179 [6] Faravelli L: Journal of Engineering Mechanics Vol. l15 (1989) , p.2763

Key Engineering Materials Vols. 40-41

Design, Materials and Processing for the Summer Olympic Torches *ZHANG Jian Bin1, 2, a, YU Dong Mei1, b, YIN Xiao Qiang1 and JIA Jian Gang1 1State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China 2Key Laboratory of Non-ferrous Metal Alloys and Processing of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China ajbzhangjb@gmail.com, bbjyudongmei@gmail.com (*Corresponding author) Keywords: Olympic torch, design, materials, processing Abstract: Olympic torches are the fantastic combination of successful design, appropriate materials and optimum processing which are the basic concept concepts in the major of Materials science and engineering.
This paper will review how materials are specified for the Olympic torches and which material properties/factors one must consider for the application.
Materials selection A variety of other materials have been used over the years – from various woods, including birch, maple and pecan, to the more exotic silver, copper and bronze alloys, with even leather featuring for some of the handles [2].
What will the future bring to materials/or materials related processing?
Vol.214 (2013), p. 19-29 [7] Stewart Bland: Olympic class materials, Materials Today.

Key Engineering Materials Vol. 48

Approach for Setting Project Buffer with Engineering Materials Based on the Theory of Unascertained Rational Number Wanqing Li1, Zhe Zhao 1 Lingyu Meng 2 1 Hebei University of Engineering. 056038,Handan,China 2 Hebei University of Engineering. 056038,Handan,China yiyayiyo@yahoo.com.cn Key words: CCM; unascertained rational numbers; buffer size,Engineering materials Abstract.
Even though this article develops the critical chain method, the new idea and method of critical chain method still has some immature places, such as the identification/selection of the key chain and multiple resource-constrained determination of the next buffer size.
The author: Wanqing Li (1954-), male , Ph.d., professor, Hebei University of Engineering, engaged in the research of engineering project management .
Journal of Industrial Engineering and Engineering Management. 72--75 (2002) [4] Mi-yuan Shan, Ying Long: An approach for improving buffer of critical chain management and its application.
Journal of Jiangsu University of Science and Technology(Natural Science Edition). 75--78 (2009) [7] Wan-qing Li, Wen-qing Meng, technology of engineering network design.

Effect of some key factors on the strength of recycled concrete Xuebing Zhang1,2,a, Zhi Fang1,b 1 College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China 2 College of Civil Engineering & Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China azhangxb00@163.com, bfangzhi@hnu.cn Key words: recycled concrete; compressive strength; split-tension strength; key factors Abstract: Because there exists a used cement mortar layer outside the recycled aggregate, there are more interfaces inside recycled concrete, which would result in recycled concrete has different properties from ordinary concrete.
Cement Using the Panfeng Brand 32.5 and 42.5 grade silicate cement produced by Hunan Xiangxiang Building Materials Industry.
But in actual engineering, the sand ratio can’t be much little.
[5] Jiabin Li, Jianzhuang Xiao, Jian Huang: Journal of Building Materials Vol. 9 (2006), p. 297-301, in Chinese
[14] Xiaoming Huang, Ganghua Pan, Yongli Zhao: Civil Engineering Materials (Southeast University Press, Jiangsu 2001), in Chinese.