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Introduction High alloy Cr-Ni and Cr-Ni-Mn carbide precipitation hardened austenitic steels are a promising group of materials for use at elevated temperatures.
The heat treated material was then used for making cylindrical, threaded M14 specimens for fatigue tests, diameter d0 = 10 mm and measuring length l0 = 30 mm.
Kawahara, Strengthening and toughening of Cr-Ni-Mn-V austenitic hot work tool steels, Journal of Heat Treating 2 (1982) 321-330
Sourmail, Precipitation in creep resistant austenitic stainless steels, Materials Science and Technology 17 (2001) 1-14
Ducki, Research of the microstructure and precipitation strengthening in a high-temperature Fe-Ni superalloy, IOP Conference Series - Materials and Engineering 35 (2012) 012007

In order to study seismic behavior of double web-angle and top-seat-Angle connections, finite element methods, which included material, geometric and contact nonlinearity, were used to the model under cyclic loading.
When the grade and diameter of bolt were small, the bearing capacity of joint would be too little ,but caused for wasting of material.
Acknowledgements The work presented in this paper is supported by funds of Guangdong Provincial Department of Education (Grant No. 2012KJCX0084) ,and Science and Technology Project for Ministry of Construction,the People's Republic of China (Grant No. : 2012-k2-8; 2010-K3-33).
[9] Ming-zhong Wei,Guo-xin Dai, Steel Structure, (Chinese Wuhan University of Technology Press,2007) [10] Ai-guo Chen, Qiang Gu:Harbin Institute of Technology Journal, Chinese, Vol. 40(2008), p. 631.

It is found that drilling method, speed of rotation (SOR), material properties, and length of compression drillstring all can influence parametric resonance zones.
Apart from SOR and drilling method, other factors such as material properties, length of compression drillstring and so on can also influence parametric resonance zones.
Acknowledgements This work is supported by Key Laboratory of Oil and Gas Equipment from Ministry of Education (2006STS02) and Science Foundation of Southwest Petroleum University.
Zhang: Chinese Journal of Applied Mechanics Vol. 17 (2000), p.128 Fig.3 Comparison of the 4th principal parametric resonance zones in air drilling. 0 100 200 300 400 500 0 200 400 600 mud drilling air drilling Pt (kN) P0 (kN) Fig.2 Comparison of the 4 th principal parametric resonance zones for SOR=80rpm. 0 100 200 300 400 500 0 100 200 300 400 N=60rpm N=80rpm Pt (kN) ∆P0 (kN) 0 100 200 300 400 500 200 400 600 800 N=60rpm N=80rpm Pt (kN) P0 (kN) ∆P0 (a) (b)

Introduction Discovered in 1991 by Iijima [1] carbon nanotubes (CNTs) are being globally as a new dream materials in the 21st century due to their extraordinary mechanical and unique electronic properties and broadening their applications to almost all the scientific areas.
Han, Synthesis of well-aligned carbon nanotubes on MCM-41, in Studies in Surface Science and Catalysis. 2002. p. 1237-1244
Dai, "Nanotube molecular wires as chemical sensors," Science, Vol. 287, pp. 622-625, 2000
Gabriel, "Gas sensor array based on metal-decorated carbon nanotubes," Journal of Physical Chemistry B, Vol. 110, pp. 21014-21020, 2006
Ma, "An approach to carbon nanotubes with high surface area and large pore volume," Microporous and Mesoporous Materials, Vol. 100, pp. 1-5, 2007

It is an intrinsic property of material [1].
The materials were purchased from farmers market.
One reason is that vegetable oil materials have the viscous-elastic-plastic feature [10].
Journal of China University of Mining & Technology，2004，33（1）：19~24
Shichuan Building Science，2010，37(5)：54~69

All activities of the study or research are directed toward gathering data and information from books, conference papers, journals, and patents shall be recorded.
Next, the material selection process is important to order to ensure that selected materials are suitable for the application of the system and able to withstand the maximum load applied.
Overall, PVC has been chosen as the main material for the product, especially for the pipes and blades.
Clough, Energy profile of Malaysia, National Council for Science and the Environment, (2007)
[2] Yong Chen, Energy Science & Technology in China: A roadmap to 2050: strategic general report of the Chinese Academy of Sciences, Chinese Academy of Science (CAS), Springer, (2010)

Case Study on Economic Evaluation of Biogas Project in Large-scale Pig Farms Wenlin Ma 1, 2,a , Xueqin Li 1, 2,b and Bolin Deng3,c 1Beijing climate change response research and education center, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China 2 Department of environment science and engineering, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China 3 Beijing Animal Science and Veterinary Medicine Service, Beijing, 100107, China amawenlin1130@126.com, blixueqin_lxq@126.com, cdbl28@sina.com Keywords: biogas project; economic benefits; large-scale pig farms; cost benefit analysis Abstract: A case of a biogas project built in a large-scale pig farm in Beijing was studied in this paper.
Its feed solids concentration is 8%, and residence time of materials 25d, daily biogas output 800 m3, ferment residual 12t.
After-treatment Farmland use or discharge Energy use for production and living Gasholder Purification Anaerobic digester Pre-treatment Biogas Manure Residual Organic fertilizer Slurry Fig.1 Process diagram of biogas project Investment for the project Construction costs of biogas project include direct material costs (such as building materials and equipment), direct labor costs (such as wage of technicians, unskilled laborer, handyman) and manufacturing costs (consisting of utilities and accommodation expenses during building activities).
Wang, Xing Su and Yanfen Tang: submitted to Transactions of the CSAE (2008) .In Chinese [6] Yunzhang Tu and Zaoliu Wu: submitted to SOLAR ENERGY (2012) .In Chinese [7] Lizhi Zhu and Han Ye: submitted to CHINA POPULATION, RESOURCES AND ENVIRONMENT, (2012) [8] Jian Wu and Feng Li: submitted to Journal of Anhui Agri.
Sci (2008) .In Chinese [9] Yongxin Hua and Jianping Zhu: submitted to New Energy and Technology (2004) .In Chinese [10] Wenhao Liu, Baogui Zhang and Li Chen: submitted to Renewable Energy Resources (2012) .In Chinese [11] Bin Lin, in: Theory and practice on development of biogas projct of biomass energy , edited by China Agricultural Science and Technology Press, China, Beijing (2010), in press

Isothermal extrusion study and simulation of magnesium alloy For hilt of electric screwdriver Chuntian Li1, a, Chang Wang2, b, Yamin Hu1, c 1College of Material Science and Engineering, Chongqing University of Technology, No.69 HongGuang Road, Ba’nan district, Chongqing, P.R.
Preface Magnesium alloys have wide applications in automobiles, aerospace; communication industry and so on due to it is the lightest alloys in the structural materials of metal.
Its material is AZ31D Magnesium Alloy.
Materials Review, 2000, 14; 53-56
The latest progress and prospects of Mg alloys [J].The Journals of Metal Technology.2001, 51(1); 2-13

Experiments The pre-corrosion sheet material for this study was satisfied the specifications for the LC4 designation.
The 3D models adopted linear material model with a Young’s modulus of elasticity (E) 71.7 GPa and a Poisson’s ratio of 0.33 in the LMS analysis.
Engineering Fracture Mechanics Vol.59 (1998), p.305 [4] American Society for Testing and Materials, U.S.
ASTM G34-01(2007) [5] American Society for Testing and Materials, U.S.
Computer Vision: Graphics and Image Processing Vol.33 (1986), p.174 [7] DuQuesnay D L，Underhill P R，Britt H J: International Journal of Fatigue Vol.25 (2003), p.371

A thorough understanding of the behavior of materials to single overload would be beneficial for fatigue crack propagation analysis under variable amplitude loading.
Experiment Engineering Materials and Test Specimens.
Acknowledgments This work was partially supported by the Korea Science and Engineering Foundation under Contract No. 00A-09-02-02-2.
Reference [1] ASTM E647-99: Standard test method for measurement of fatigue crack growth rates, Annual book of ASTM standards, Philadelphia, American Society for Testing and materials (1999), pp. 591-630
[2] Elber, W.: The significance of fatigue crack closure, Damage tolerance in aircraft structures, ASTM STP 486, Philadelphia: American Society for Testing and Materials (1971), pp. 230-242