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Robust speed control algorithm of welding wire feed system based on the state space model Xiumei Wu1,a, Limin Sha1, Taozi Si1, Lei Jiang2,b 1.School of Computer Science, Shanghai Second Polytechnic University, Shanghai, China 2.School of Information Science and Technology, Donghua University Shanghai, China axmwu88@163.com,bwang-sunduan@sohu.com Keywords: Robust control; Welding wire feed system; Random disturbance Abstract.In the modern welding technology of metal materials, the welding robot is a very important factor.
Introduction To the manufacture of the advanced materials, the welding is often a kind of important method.
Many high-performance materials’ manufacture needs the process of the welding, such as tungsten rhenium alloy. [1] In the modern welding technology of metal materials, the welding robot is a very important factor.
To some kinds of high-performance materials, the feed speed of welding wire must change with the requirement and the disturbed feed speed will seriously affect the quality of the welding.
Asian Journal of Control. 2003, 5(3): 399-405

Based on the study of slow and controlled release fertilizer, we summarized a large number of research materials at home and abroad, comprehensive elaborated the development progress of slow and controlled release fertilizer in China, and reviewed the utilization efficiency of fertilizer in different corps.
Controlled release fertilizer application is important on crop yield, high efficiency and friendly environment, it should be vigorously support and promotion. 2011 November, “New fertilizer slow/controlled release materials engineering technology research center” were establishmented by both the research and the division of Chinese Academy of Agricultural Sciences resources and heilongjiang jinshida agricultural science and Technology Development Co.
Zhang Daofu et al with weathered coal and peat as raw material to prepare a nano humic acid controlled-release fertilizers.
Research and Development of Controlled-Release Fertilizers as High Efficient Nutrient Management Materials in China.
Shanghai Journal of agriculture,1990,8（4）：272-278 [7] Zhang B L.Compound fertilizer of modified calcium magnesium phosphate.

Experiments Materials and Foamable Precursor Preparation.
Wang, et al., Compressive properties of cellular Mg foams fabricated by melt-foaming method, Materials Science and Engineering: A. 527(21) (2010) 5405-5409
Sakaguchi, et al., Processing of an open-cellular AZ91 magnesium alloy with a low density of 0.05 g/cm3, Journal of Materials Science Letters. 18(18) (1999) 1477-1480
Zhang, et al., Evolution of pore size distribution and mean pore size in lotus-type porous magnesium fabricated with gasar process, Journal of Materials Science & Technology. 22(3) (2006) 306-310
Banhart, A study of Mg and Cu additions on the foaming behaviour of Al–Si alloys, Journal of Materials Science. 46(15) (2011) 5227-5236

The research of biomaterial is mainly motivated by the increasing demand for reconstruction materials for hard tissue replacements [3-4].
[2] B.Ben-Nissan, Current Opinion in Solid State and Materials Science 7 (2003) 283
Kutbay, Materials Chemistry and Physics 110 (2008) 68
Koh, S.B.Seo, H.E.Kim, Materials Science and Engineering C 23 (2003) 515
Doremus, Materials Science and Engineering C 27 (2007) 421 [13] S.F.

The radiative nature of trivalent RE ions in variety of laser host materials is usually investigated by Judd-Ofelt theory.
Speghini, Composition and Concentration Dependence of Spectroscopic Properties of Nd3+ -Doped Tellurite and Metaborate Glasses, Optical Materials 33 (2011) 928-936
Lavin, Characterization of Er3+ and Nd3+ Doped Strontium Barium Niobate Glass Ceramic as Temperature Sensors, Optical Materials 33 (2011) 742-745
Chen, Judd-Ofelt Analysis and Energy Transfer Processes of Er3+ and Nd3+ Doped Fluoroaluminate Glasses with Low Phosphate Content, Optical Materials 38 (2014) 167-173
Ferid, Radiative parameters of Nd3+ Doped Titanium and Tungsten Modified Tellurite Glasses for 1.06 µm Laser Materials, Journal of Quantitative Spectroscopy & Radiative Transfer 147 (2014) 224-232

Experimental Materials.
Construction and Building Materials. 27(2012)531-533
Journal of Shantou University (Natural Science). 13(1998)27-32
Advanced Materials Research. 746(2013)58-61
New Building Materials. 6(2007)5-7

CoCrW CoCrBSi and MCrAlY alloys are often chosen as the protective coating materials.
Since the formation of modified coatings improves the surface properties of materials, the service life of components prolongs.
Materials and methods The substrate material is austenitic stainless steel 1Cr18Ni9Ti with size of 18 mm×12 mm×6 mm.
Materials Transactions, Vol. 47(2006), p.1638-1642 [3] Markocsan Nicolaie, P.
Materials and Corrosion, Vol. 56(2005), p.606-610 [11] C.

The influences of zirconia on the properties of magnesia alumina spinel bricks Shanshan Hong1,a, Yong Li1,b 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing100083, China ashanhupingerhss@163.com, blirefractory@vip.sina.com Keywords: oxy-fuel glass melting furnace, magnesia alumina spinel, zirconia, alkali resistance performance, creep property Abstract.
The raw materials are alumina-rich MgAl2O4 spinel AR78, 97 fused magnesite, zirconia, Na2CO3 (analytical pure) and K2CO3 (analytical pure).
Materials Review.
Journal of Materials and Metallurgy.
Journal of University of Science and Technology Beijing.

The workpiece materials Titanium alloy Ti6A14V constitutive equation of the parameters are shown in Table 1: Table 1 Ti6A14V constitutive equation parameters A B C m n 1098 1092 0.014 1.1 0.93 The distribution of normal stress and shear stress along the x direction on the rake surface as shown in the Fig.2.
The reasons for this phenomenon is the material thermal softening effect, the increasing temperature reduced the material flow stress.
International journal of Machine Tools & Manufacture．1997，(37)：885-899
A new stress-based model of friction characteristic in machining and Its significant impact on residual stresses computed by finite element method[J]．International Journal of Mechanical Sciences，2002，(44)：703-723
[4] W Grzesik．The role of coatings in controlling the cutting process when turning with coated Indexable inserts[J]．Journal of Materials Processing Technology，1998，(79)：133-143

Finite element analysis of interfacial stress of Mg-baced composites reinforced with short fiber Weixue Li 1,2,Shuguang Du 2,Jianfeng Dai 1,2,Qing Wang 1,2 1State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology, Lanzhou 730050 2School of Sciences, Lanzhou University of Technology, Lanzhou 730050, China lwx@lut.cn Keywords: Finite element; Magnesium Matrix Composite; Length; Diameter Abstract: In elastic deformation range, this paper reports a finite element study of effect of length and diameter of the fiber on intrfacial stress of AZ91D metal matrix composites reinorced by short fiber.
The shaded region, OAFE, represents a fibre and is entirely embedded in a matrix material (unshaded region), both fibre and matrix materials are homogeneous and isotropic.
Table 1 Material properties Material Young’s modulus(Gpa) Poisson’s ratio AZ91D Mg 45 0.35 SiC 400 0.25 The material properties were baced on commonly accepted values.
The material properties are shown in Table 1.
References [1] Gui Mangchang, Journal of materials processing technoligy, Vol. 106 (2000), p.58-67 [2] N.Chandra, C.R.ananth, compos.Sci.Technol, Vol. 54(1995), p.87-100 [3] K.L.Goh, R.M.Aspden, D.W.L.Hukins, Composites Science and Technology, Vol. 64(2004), p. 1091-1100 [4] Guili Liu, Zhonghua Yang, Qing Li, Science Technology and Engineering, Vol. 2010(23), p.5630-5633 [5] Guo-Zheng Kang, Qing Gao, conpsosites part A applied science an manufaturing, Vol. 33(2002), p. 657-667 [6] S.Balasivanandha Prabu, L.Karunamoorthy, G.S.Kandasami, Journal of Materials Processing Technology, vol. 153(2004), p.992-997 [7] S.A.Hayes, R.Lane, F.R.Jones, Composites: Part A, Vol. 32 (2001), p.379-389 [8] Guo-Zheng Kang, Qing Gao, conpsosites part A applied science an manufaturing, Vol. 33(2002), p. 657-667 [9] Xiaoyu Jiang, Qing Gao, Composites Science and Technology, Vol. 61(2001), p.1359–1366 [10] S.Balasivanandha Prabu, L.Karunamoorthy, Journal of Materials Processing Technology,