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The material of test pieces is aluminium alloy.
Acknowledgments The authors gratefully acknowledge the financial support for this present work by the Important National Science & Technology Specific Projects of China (2009ZX04001-073-03).
References [1] Nayak PR: Transactions ASME Journal of Lubrication Technology, Vol. 93 (1971), pp.398-407
[6] A.L.Wang,C.X.Yang: Chinese Journal of Mechanical Engineering, Vol. 38 (2002) No.5, pp.80-85.
(In Chinese) [10] Ge SR: Journal of China University of Mining & Technology, Vol. 28 (1999) No.3, pp.204-207.

（2）Crack width （4） bj: Crack width (mm);λb: Crack width coefficient; The design temperature difference and steel reinforcement ratio are the main factors influencing the design of crack width and spacing under certain conditions of the concrete and steel material.
Journal of Traffic and Transportation Engineering,2001, 1(2):56-57
Journal of North China Institute of Water Conservancy and Hydroelectric Power, 2012, 33(3):40-43
Shanxi Science & Technology of Communications, 2012,01：1-3 [5] Selezneva, O.
Journal of Transportation Engineering, 2005,131(9):645-652

In this paper, a novelRTD based on new material structure is proposed which could reach a relative high PVCR (peak-valley-current-ratio).
Layer Material Thickness[nm] Dope[cm-3] Emitter GaAs 100 1×1021 Barrier AlGaAsP 2 Well GaAs 2 Barrier AlGaAsP 2 Collector GaAs 100 1×1021 Substrate SI GaAs Thenset time parameter of the simulation to 300K, we got the simulation result as shown in Fig.2.
Conclusions In this paper, we proposed a novel resonant tunneling diode based on new material structure.
Acknowledgments  This work was supported by Natural Science Foundation of Jiangsu Province, China (BK2011337).
Henini: Resonant tunneling diode circuits using Pspice, Microelectronics journal, Vol. 34, p.741-745, May-Aug. (2003)

Introduction Polymeric materials based on polylactide acquire their significant importance in a variety of human activities.
Such materials are biocompatible, do not cause any environmental pollution as in the process of biopolymer production, the CO2 emission into the atmosphere is 2-3 times lower [1, 2].
Large raw materials, material and energy resources are required to implement these steps.
At the same time, the recycling share of spent polymeric materials and products based on polylactide is very small.
Rudnik, Compostable polymer materials, First edition, Elsevier Ltd. (2008) 211

But the variation is no longer obvious with the increase of hydration time, that is to say, the specimens resistivity tends to be stable. 3.2 The relationship of electrical resistivity with carbon fiber content As conductive materials and insulating materials are compounded and when the content of conductive material is less than a critical value, the resistivity of composite material reduces sharply with the increase of conductive materials.
When the volume fraction of conductive materials reaches to a certain value, the reduction of the electrical resistivity will become extremely slow, and that kind of phenomenon is called percolation.The critical value is called percolation threshold[4] and the curve reflecting the relationship between the electrical resistivity and conductive filler content is called filtration curve.
But the dispersion effect of carbon fibers in cementious composite materials is not ideal enough and the stability of electrical resistivity needs to be enhanced.
Acknowledgements This research was financially supported by Hubei Provincial Department of Education (D20101301), Hubei Provincial Natural Science Foundation (2010CDB04301) and National University Student Renovation Project at Yangtze University(111048911).
References [1] Qizhao Mao, Bingyuan Zhao, Darong Sheng etc, Journal of Wuhan Uni. of Tech.

Experiment Starting materials used Li2CO3, Nb2O5, Tb4O7 and MnO2 powder of 99.99% purity.
Also, doping materials of 0.5 mol% Tb4O7 and 1.0 mol% MnO2 were prepared by mixing the raw material.
Huignard (Eds.), Photorefractive Materials and their Applications, Vol. 1, Springer, Berlin, 1998
Neurgaonkar, Science 282 (1998) 1089
Materials. 118 (2003) 486

Pozzolanic materials are characterized by the presence of a high amount of amorphous SiO2 and can react with portlandite (lime), which is a by-product of the cement hydration process.
Similar pozzolanic materials, such as fly ash, blast furnace slag, silica fume, etc. have been successfully utilized in cement-based materials for many years.
Therefore, to properly utilize waste glass in cement-based materials a detailed analysis of the material itself is required.
Used Materials Cement.
Zhang, Utilization of mineral wool waste and waste glass for synthesis of foam glass at low temperature, Construction and Building Materials, Volume 215, 10 August 2019, Pages 623-632.

Introduction The core of the researches devoted at investigating the machinability of metallic alloys by means of both numerical and experimental approaches are concentrated on the as defined Difficult-To-Cut (DTC) materials because of the higher industrial demand of overcoming the problems connected with machining of these alloys.
Experimental procedure Material.
Material flow stress.
Zhou, High temperature deformation behavior of a+b-type biomedical Titanium alloy Ti–6Al–7Nb, Materials Science and Engineering A499 (2009) 252–256
Özel, Modified material constitutive models for serrated chip formation simulations and experimental validation in machining of titanium alloy Ti-6Al-4V, International Journal of Machining Tools and Manufacture, Volume 50 (11) (2010) 943-960

Material and Methods Text Materials.
Acknowlegements Funding for this project was provided by the following grants: the Ministry of Science and Technology, PR China, Project Nos. 2012AA101801, 2012CB215300, 2009BADA7B04, 2011AA100209 and Industry & Technology system (forage) .
Science Foundation in China,2008.5.268-271．
Plant funetional composition influences rates of soil carbon and nitrogen accumulation Journal of Ecology，2008，96(2):314-322
Journal of Ecology and Rural Environment,2008,24(2):32-35.

Materials and methods Treatment of experimental animals Experimental animals.
Estrogen and progesterone act on endometrium by each receptor, making endometrium glands and interstitial cell to edema, revascularization, and providing material base for embryo implantation.
Beijing: Science Press,2005: 228-230
Journal of Chongqing medical university. 2007,1260-1264
West China Medical Journal, 2005, 20(2) 393-395