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In the last twenty years the cavitation erosion resistance of various welded materials was subject of extensive studies.
The multitude of materials used for the fabrication of hydraulic equipment and the variety of the operating conditions in hydropower units require adapted solutions.
The use of a volume parameter, such as the mean depth of erosion, is justified when it is necessary to compare two materials with different densities.
Fusan, Correlation of cavitation erosion resistance and mechanical properties of some engineering steels, Journal of Material Science, vol. 41, 2006, pp. 2151–2153
Structure and Constitution, Journal of Phase Equilibria and Diffusion, Vol. 29, No. 6, 2008, pp. 500-508.

The research includes glassy materials, compounds, nanomaterials, metastable solid solutions, or disordering, and even modelling of energy transfer or mechanistic study during milling.
Then occasionally, powders are milled with process control agents (PCAs) [2] to prevent excessive cold welding, or to achieve an effective milling for less-ductile materials such as oxide powders in slurry.
Co., Ltd., were used as starting materials.
Suryanarayana, Progress in Materials Science, 46 (2001) 1-184
Indris, et al., Journal of Physics Chem.

In order to study the influence of material model on the results of simulations, three material models were considered: - idealized elastoplastic material model without hardening, - bilinear material model with hardening defined by tangential modulus, - material model based on nonlinear relation between stress and strain.
Although the curves for elastoplastic and bilinear materials are practically identical, they differ markedly from those related to a multilinear material.
Acknowledgement The support of the Scientific Grant Agency of Ministry of Education, Science, Research and Sport of the Slovak Republic and Slovak Academy of Sciences under grant VEGA 1/0090/12 is greatly appreciated.
Ďuricová, Computational modeling of geometric imperfections and buckling strength of cold-formed steel, Journal of Constructional Steel Research 78 (2012) 1–7
Rasmussen, Full-range stress–strain curves for stainless steel alloys, Journal of Constructional Steel Research 59 (2003) 47–61.

Derkach, Research of Technical and Economic Properties of Material of Porous Fuel Briquettes from the Solid Combustible Waste Impregnated with Liquid Combustible Waste, Materials Science Forum. 1038 (2021) 303–314
Suchikova, Substantiation of expedience of application of high-temperature utilization of used tires for liquefied methane production, Journal of Achievements in Materials and Manufacturing Engineering. 87. 2 (2018) 77–84
IOP Conference Series: Materials Science and Engineering. (2019) № 708-1
Materials Science Forum. 968 (2019) 355–360
Materials Science Forum. 1006 (2020) 179–184.

Effect of Technological Parameters on Preparation of Mg-based Foam Materials Hongjie Luo1, a, Li Zhang1, b, Zhengguo Xu2, c and Yuansheng Yang2,d 1School of Materials and Metallurgy, Northeastern University, Shenyang(110819), China 2Institute of Metal Research, Chinese Academy of Sciences, Shenyang(110016), China aluohj@smm.neu.edu.cn, blizgangy@126.com, czgxu@imr.ac.cn, dysyang@imr.ac.cn Keywords: Magnesium alloy, Silicon carbide, Magnesium carbonate, Foaming in melt, Mg-based foam materials.
Schematic illustration for the casting process of magnesium foam Procedure Raw Materials.
Asahina, Processing of an open-cellular AZ91 magnesium alloy with a low density of 0.05 g/cm3, Journal of Materials Science Letters. 18 (1999) 1477-1480
Nakajima, Fabrication, properties and application of porous metals with directional pores, Progress in Materials Science. 52 (2007) 1091-1173
Zhang, Evaluation of porosity in lotus-type porous magnesium fabricated by metal/gas eutectic unidirectional solidification, Materials Science and Engineering A. 402 (2005) 47-54

Baoning, Mechanical analysis of composite materials, China Science and Technology Press, Beijing, 2006
Journal of composite materials, (1971):50-57
Evensen, Interlaminar shear in laminated composite under generalized plane stress, Journal of composite materials, (1970):204-220
Levy, A boundary layer theory-part Ⅱ: extension of laminated finite strip, Journal of composite materials, (1975): 42-52
Tang, A boundary layer theory-part Ⅰ: laminated composites in plate stress, Journal of composite materials, (1975): 33-41

Fig. 2 TG- DTA curve of the sample X-ray diffraction measurement Fig. 3 shows the XRD patterns of the composite materials and the single materials.
Metallic Functional Materials, 1999, 6 (4) : 161
Materials Review, 2004, 18 (3) : 70-73
Journal of Functional Materials, 2006, 6 (37) : 877-879
Ordnance Material Science and Engineering, 2002, 3 : 86-89

The Gas Sensitvity Character of WO3 Nanosized Material HUANG Shi-zhen1,a , LIN Wei 1,b ，CHEN Wen-zhe1,c 1 Department of Electronic science Applied Physics, Fuzhou University,Fuzhou 350002,China a email: hs501@fzu.edu.cn b email: mqks@fzu.edu.cn cemail: cwz@fzu.edu.cn Key words: Nanosized material; WO3; NO2 Abstract By thermal decomposition, WO3 nanosized material was prepared as sensitive material and doped SiO2 nanosized material has been prepared using Sol-Gel process.
WO3 is a material developed in recent years.
Figure 1(a) and figure 1(b) are SEM pictures of microstructure of materials doped with SiO2 and pure WO3 respectively.
In the sinter temperature of 500-600℃，surface activity of grains of the sensing material is strong and BET of the material is large, result in high sensitivity to NO2 of the material.
References [1] Xiu sheng Wang, Liang ying Zhang, Xi Yao: Functional Material, Vol.29 (1998), p.276-277 [2] Jun Bao, Guo xing Xiong, Jin hua Gu: Film Science and Technology, Vol.18(1998), p.42-44 [3] Yu Hua-liang, Huang Shi-zhen, Lin Wei, Chen: Chinese Journal of Sensor and actuators, Vol.18 (2005), p.325-328 − − − − − − + →++ →+ ads ads ads ads O NOeONO NOeNO 2)(2 )( 2 22 2 2 Figure 2：Curve of response-recovery of the element

Intelligent Matching of Cutting Tools with Workpiece Materials J.
Those cutting tools, which materials have greatly chemical affinity with workpiece materials, are scarely selected.
Those ceramic tools which materials contain aluminum and Ti elements, i.e.
After matching in material performance between cutting tool and workpiece materials, geometry angle needs to be considered.
Zhou: Journal of Hefei University of Technology (Natural Science), Vol.(2001) 24 No.6, pp.1091-1094

The aim of the present study is to clarify the actual conditions of indoor thermal environment with building materials, which built after 1980 years in urban areas of Zhejiang Province.
The results show that the wall materials of the most residential buildings are clay solid bricks, the most windows type is aluminum alloy, and the most buildings are uninsulated.
Fig.5 shows the wall materials of the investigated residential buildings.
The wall materials of the most buildings were clay solid bricks, and the ratio of perforated brick to all is about 20%.
Acknowledgements The current study is supported by Science Technology Department of Zhejiang Province, under the contract no. 2010C33067.