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And has relationship with variable and, thus can be expressed as Where represents modulus of elasticity, represents polar moment of inertia, represents cross-sectional area, represents length, represents mass of the screw and the density of the material can be expressed with .
Acknowledgements This work was financially supported by the Beijing municipal science and technology commission; Beijing Machine Tool Research Institut and School of Mechanical and Electrical Engineering, Beijing information science and technology university.
Journal of Vibration and Acoustics, 1987, 109(4): 361-365
Journal of agricultural machinery, 2009, 40(9).
Journal of Yan'an University(Natural Science Edition), 2006, 25(3).

Li: Management Science Vol. 48 (2002), p. 1196 [3] S.
Tang: Management Science Vol. 50 (2004), p.550 [5] D.Q.
Wang: International Journal of Production Economies Vol. 97 (2005), p. 196 [6] S.K.
Yue: Journal of Business Research Vol. 61 (2008), p.950 [7] W.
Guo: Advanced Materials Research Vol. 204-210 (2011), p. 1603

Introduction Ammonium polyphosphate (APP) is an effective materials as intumescent flame retardant, it is a well known component of halogen-free flame retardant [1-4].
Experimental Methods Materials:Diammonium hydrogen phosphate (DAP) and urea were supplied by Sinopharm Chemical Reagent Co.
In this study, A certain ratio of melamine and urea are used as condensed agent, diammonium hydrogen phosphate is used as raw materials, this process is a non-P2O5 process, so the effect of temperature on crystalline forms should be studied in detail.
Journal of Applied Polymer Science.
Journal of American Chemical Society, Vol. 91,(1969),p. 62

Especially the output of controller is much stable, which has a significant value in reducing losses, saving raw materials, controlling the cost in industrial production.
International Journal of Systems Science, 1992, 23(1): 145-149
Frontier Science, 2007, 1(1): 24-31
Journal of Central South University of Technology (Natural Science), 2003, 34(4): 383-385
Beijing, University of Science and Technology Beijing: 2007

This relationship is suitable for ductile materials:
In the case of brittle materials (for example cast irons) the modified Gough–Pollard criteria were used in the form:
Imai, Fatigue criterion for notched and unnotched specimens under combined stress estate, Zairyo/Journal of the Society of Materials Science 29, 325 (1980) 993-997
Robert, Improvements of multiaxial fatigue criteria computation for a strong reduction of calculation duration, Computational Materials Science 15 (1999) 381-399
[16] Xin Lin, A Method for the Prediction of Fatigue Life of Notched Metallic Material, Advanced Materials Research 712-715 (2013) 557-561

Nanosecond pulsed lasers have been widely used in the micromachining of Si [7] and other brittle materials, and has a potential for effective Ge micromachining.
Instead, a hump was formed (Fig. 3(b)) and spatter points or deposited materials can be found in the surrounding area (Fig. 3(a)).
Hirahara, In Conference Record of the 2006 International Symposium on Micro-NanoMechatronics and Human Science, NGO, (2006)
Haller, Material Science in Semiconductor Processing. 9(4-5) (2006), pp. 408-422
Bamberg, Journal of Materials Processing Technology. 209(8) (2009), pp. 3740-3751

Influence of Synthesis temperature on the ZnNb2O6 Powders Prepared via Co-precipitation Method Yong Du 1,a, Jinliang Huang 2,b, Yongjun Gu 3,c 1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China 2 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China 3 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China ady_kdcl2012@163.com, bhuangjl@haust.edu.cn, c yjgu@haust.edu.cn Key words: coprecipitation; ZnNb2O6 powder; synthesis temperature; property Abstract: ZnNb2O6 powder was successfully synthesized via coprecipitation method with Nb2O5, Zn(NO3)2·6H2O as raw materials and ammonia as precipitant agent.
Among these compounds, ZnNb2O6 is known as excellent microwave dielectric materials, which has excellent dielectric properties: Q×f = 87,300GHz, ε r=25 and τ f = 56ppm˚C[5].
Experimental In a typical experiment, niobium(V) oxide, zinc nitrate and liquid ammonia were used as starting materials, and all were of AR grade.
Mixtures of raw materials with a molar ratio of Zn to Nb of 1 were put in a beaker, when the Synthesis temperature was controlled at 0˚C(ice and water mixture), 50˚C, 80˚C.
Journal of Heilongjiang Institute of Science and Technology (In Chinese) .Vol. 4(2006):p.201-204 [9] Feng Gao, Jiaji Liu, Rongzi Hong, et al.

Chinese Journal of Soil Science,2006,4(2)
Chinese Journal of Soil Science, 2008,40(2):212-215
Journal of Agro-Environment science, 2004,6(23):72-76
Journal of Nanjing Forestry University (Natural Science Edition) ,2012,5(3):59-63
Environment science,2007,28(40)

Theory study on polarizability and dipole moment of WmBn(m+n≤7) clusters Yin Lin1,a , Zhang Xiu-Rong*1,b , Zhang Fu-Xing2,c 1) School of Mathematics and Physics, Jiangsu University of Science and Technology;Zhenjiang Jiangsu,212003,China; 2) School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu,212003, P.
As the prototype of nano scale, clusters showed many different properties relative to atomic and bulk materials.
The researches on clusters are conducive to understand the middle transition state of material from macrocosmic to microcosmic.
Journal of Physics and Chemistry of Solids.2009, 70: 64-71 [7] Wei A, C.
Journal of atomic and molecular physics,2012,29(1):49-55 [9] Jing Qun, Zhang Jun, First principles study of lowest energy structures and electronic properties of GenB(n=12-19) clusters[J].

Study on the Gemological Characteristics of Amber from Myanmar and Chinese Fushun Qiuyu Xinga, Miao Yang, Huixuan Yang and Endong Zub Faculty of Material Science and Engineering, Kunming University of Science and Technology,Kunming 650093, People’s Republic of China axingqiuyu111@126.com, bzend1000@hotmail.com (corresponding author) Keywords: Amber, Myanmar, Fushun, Gemmological characteristics, SEM, FT-IR Abstract.
It expresses the sense of fluctuation of cloud rhyolite in Myanmar amber samples, while the characteristics in Chinese Fushun amber samples are showing more crack and fissure which filling with a lot of dark materials and the dark package bodies, and they are external covered with much of coal mine extending to the internal.
Scanning electron microscopy (SEM) test is one of the main detection and analysis methods in the field of material testing and research which becoming more and more indispensable in material analysis research with the development of the detection and analysis technology.
[4] H.Y.Xu, R.Z.Yang, The organic elements analysis of amber, Journal of Gems & Gemmology. 9(2007)12-17
[5] J.A.Spencer, A study of New Zealand kauri copal, The Journal of Gemmology. 25(1997)408