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The assumptions in the analysis are: (1) Material is isotropic and ideal elastic-perfectly plastic; (2) Connections of beam and end vertical member are rigid, that of struts, string and other members are hinged; (3) Left boundary condition of BSS is hinge support, and right one is roller support.
The model can consider both material nonlinearities and geometrical nonlinearities and temperature-reduction method is used to simulate prestressing, main nodes of the model are shown in fig. 1.
Conclusion In stage of prestressing initial imperfections decrease the stiffness of BSS so that the deformation of the system slightly increases; but the influence is not obvious, plastic development in section of upper chords is very limited, and most of material of beam is in elastic state so that elastic analysis method can be used in the stage.
Zhao, Journal of Qingdao Technological University.
Chen, Stability Theory and Design of Steel Structure, Science Press, Beijing (2001), p.21-23.

The SiO2 colloids were obtained from Huber Engineering Materials (Qingdao) Co., Ltd.
The storage moduli (G′)and loss moduli (G′′) cross as the frequency increases, indicating that the materials are more elastic than viscous at high frequencies.
If G′ has higher magnitude than G′′, it means that the portion of the energy that will be stored in the structure of the material is larger than the portion that will be dissipated by viscous forces.
Acknowledgements The authors wish to acknowledge the financial support from the National Natural Science Foundation of China(No.50904076) for this project.
Vol.9 (1997), p.20 [3] T.D.Welton, J.Bryant and G.P.Funkhouser: SPE 105815, 2007 [4] J.B.Jiang, Y.S.Lin and X.F.Ruan: Drilling & Production Technology (in Chinese) Vol.28 (2005), p.50 [5] J.Liu, Y.J.Guo and T.Y.Liu: Drilling Fluid & Completion Fluid (in Chinese) Vol.20 (2003), p.47 [6] D.X.Liu, X.T.Zhao, G.M.Qiu et al: Chinese Journal of Applied Chemistry (in Chinese) Vol.25 (2008), p865 [7] T.D.Welton, S.J.Lewis and G.P.Funkhouser, U.S.

Thermo-oxidative stability of bismaleimides by TGA/FTIR Dongbing Geng a, Yi Zhang Aerospace Research Institute of Materials and Processing Technology (ARIMT), Beijing 100076, China agengdb@139.com Keywords: thermo-oxidative stability, bismaleimide, TGA/FTIR Abstract: This study evaluates the thermal and oxidative stability of a specific polymer composite.
Introduction The thermal oxidative stability (TOS) in an advanced polymer composite was an important material selection consideration for commercial aircraft applications.
Experimental Materials.
Journal of Applied Polymer Science Vol. 82 (2001), p. 3418 [6] R.T.

The cutting force is low while cutting the softened material because of the suitably high cutting temperature.
An increase in the cutting speed results in the higher cutting temperature which leads to the softening work material and easy to cut.
The other reason is that the work material becomes softer and easy to cut due to the higher cutting temperature which leads to a low cutting force ratio at the greater cutting speed as shown in Figure 3.
Motorcu: American Journal of Applied Sciences.
Sur: Materials and Design.

The experiment and study has also been widely carried out for material property of high-titaniferous furnace blast slag concrete, mechanical performance of basic building blocks including beams and columns.
Chengdu: Journal of Sichuan University (Engineering Science Edition), 2010, 42(5):197 - 203.
Experimental performances of RC beamsstrengthened with FRP materials.Construction andBuilding Materials,2010(24):1547 - 1559

Introduction: Garden plants are the basis of city gardens construction material, is an important part to improve the urban ecological system.
In practice, combining with the plant growth type of classification rule, application principle, the garden plant as the landscape material, according to their external forms, is divided into six types, and there are trees, shrubs, rattan, bamboo, flowers, grass and cover.
The role of landscape plants in urban landscape Increase urban landscape and enhance the aesthetic function Garden trees are widely used in urban and rural greening, sites, monuments, and temples, scenic area of all kinds of green space, including all kinds of park, botanical garden, street green space, roads, houses and other places, is the main body of urban greening materials.
The green science and technology [J], 2011:15-16
Journal of northwest institute of architectural engineering college [J], 1988 (1): 36-40.

Fig. 3 The relation curve between KDP crystal surface roughness and tool rake angle 0.3 The effect of tool rake angle on the surface roughness of KDP crystal As a kind of anisotropic fragile material, KDP crystal will be brought about some damage of crystal lattice to varying degrees by the same cutting angle and form abnormal cutting effect so that results in scratch damage to the crystal surface[8].
The author think, the deviation of the law is mainly caused by cutter material which is not as sharp as single crystal diamond and the machine tool is not high-precision enough.
Progress in the research of KDP (KH 2 PO4) crystal [J].Hebei Journal of Industrial and Technology, 2006, 23(6): 377-380.
Diamond cutting of optical brittle materials [J].Opt.
Beijing: Science Press 2001, 235-286.

Ani3, c 1Faculty of Engineering, Computing and Science, Swinburne University of Technology, Kuching, Sarawak, Malaysia 2Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Malaysia Sarawak, Sarawak, Malaysia 3Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Skudai, Johor D.T., Malaysia asthangavelu@swinburne.edu.my, baasaleh@feng.unimas.my, cfarid@fkm.utm.my Keywords: Sago bark waste (SBW), bioethanol, microwave irradiation, energy efficiency Abstract.
Materials and Methods Raw materials and Chemicals: The SBW was collected from local sago starch processing factories and it was dried by natural drying for 3 days.
These results again propose that water content is an important parameter for the efficiency of microwave pretreatment for bioethanol production from starchy lignocellulosic material.
Wen: Biochemical Engineering Journal Vol 38 (2008), p.369 [9] L.

Journal Citation (to be inserted by the publisher) Copyright by Trans Tech Publications Carbon Isotope Ratio Measurement on Foxtail Seed as an Environmental Index Soo Young Park and Jin Seog Kim Division of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science, P.O.
According to a recent report [6], the concentration of the carbon dioxide in the air was approximately 375 μmol/mol and its carbon isotope 13C was depleted by about 0.8 % relative to the reference material, Pee Dee Belemnite, δ13C = 0.
(1) To measure the carbon isotope ratio of the foxtail seeds, we used three reference materials, NBS 19 limestone (+1.95 ‰), NBS 22 Crude oil (-29.73 ± 0.09 ‰), and KRISS RM 100C (-28.17 ‰).

The difference of critical value between the case of load acting at the Fig.3 Dimension of extruded product (mm) Element type Tetrahedral Temperature (�) 480 Ram speed (mm/sec) 2 Friction factor 0.9 Billet diameter (mm) 63.5 Materials Al 6061 Velocity error limit 0.005 Convergence error Force error limit 0.05 Table 1 Major parameters setting of FE-simulation centroid of cross section and the case of load acting at the top surface of beam decreases with increasing length of fin.
If the dimension and material property of die fins are given, it is easy for the die designer to decide whether the dimension of die fins will buckle or not during extrusion process.
Acknowledgments The authors would like to extend their thanks to the National Science Council of the Republic of China under grant No.NSC 93-2212-E-110-008.
S., Stability of Monosymmetric Beams and Cantilevers, Journal of the Structural Division, ASCE, No ST1, Proc.
[8] Hwang Y.M., Chen H.C., Hwang P.T. and Wu C.Y., Finite Element Analysis and Die Design for Extrusion of Complex-Shaped Parts, Key Engineering Materials Vols274-276, pp655-660, 2004