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Experimental Procedure Materials and Procedures.The material employed in this study is SAE8620H gear steel.The composition of this steel was measured by mobile direct-reading spectrometer,shown in table 1.
[3] Garcia N V, Gonzalo O, Quintana I, et al．Residual stresses and structural changes generated at different steps of the manufacturing of gears: Effect of banded structures[J].Materials Science and Engineering A,2011,528(15) :5146 -5157
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[8] Chao Yang, Yongan Min, et al.Study of identifying the banded structure of 8620 steel bars[J].Advanced Materials Research,2014Vols. 915-916:643-649
Microsegregation behaviors of alloy elements and their effects on the formation of banded structure in pinion steels[J].Journal of University of Science and Technology Beijing,2009,31(1):199-205

Valberg, Extrusion welding in aluminium extrusion, International Journal of Materials and Product Technology, Vol. 17, No. 7 (2002), pp. 497-556 [5] A.
Tomesani, The effect of die design on the production and seam weld quality of extruded aluminum profiles, Journal of Materials Processing Technology, Vol. 164–165 (2005), pp. 1025–1031 [7] L.
Minak, Characterization of seam weld quality in AA6082 extruded profiles, Journal of Materials Processing Technology, Vol. 191 (2007), pp. 127–131
Imaninejad, Mechanical properties and microstructural characterization of extrusion welds in AA6082-T4, Journal of Materials Science, Vol. 39 (2004), pp. 6561-6569
Moreau, Laser-Ultrasonic Characterization of the Microstructure of Aluminium, Materials Science Forum, Vol. 519-521 (2006), pp. 1373-1378 [21] N.

Vickers et al. [5] used plasticine, aluminum, 6061-T6 aluminum alloy as the simulated materials to carry out the experiment of cold forging of screw.
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Monaghan, A finite element analysis of cold-forging dies using two-and three-dimensional models, Journal of Materials Processing Technology, 118, 286-292(2001)
Monaghan, Failure analysis of cold forging dies using FEM, Journal of Materials Processing Technology, 117, 209-215 (2001)
Kim, A study on precision cold forging process improvements for finite element method, Journal of Materials Processing Technology, 138, 339-342 (2003).

The considered problem is thus formulated as to find the optimal material density distribution that minimizes the material volume under specified displacement constraints.
The material density variable takes the value 1 in solid domain and 0 elsewhere.
Acknowledgements This work was financially supported by the Natural Science Foundation of China (Grant 51008248), the Natural Science Basic Research Plan in Shaanxi Province of China (Grant 2010JQ1008) and the NPU Foundation for Fundamental Research (JC200936).
Optimization of structural topology, shape, and material.
International Journal for Numerical Methods in Engineering. 24 (1987) 359-373

Introduction Watlton et al (1998) pointed out explicitly that green supply chain includes five parts – purchasing, materials management, transportation, packaging, recycling/reverse logistics.
(Tsireme et al., 2012; Payman & Cory, 2013; Constantin, Daniel & Antony, 2014) (1) Green purchasing means that producers should, in accordance with the green manufacturing requirements, choose suppliers who can supply environment-friendly materials, so that environmentally friendly materials are used as raw materials
International Journal of Purchasing and Materials Management, 34(2), 2-11
Journal of Cleaner Production, 52(8), 329-341.
Journal of Marketing, 41 (1), 77-79

Bamboo is a typical natural fiber reinforced composite material with superior mechanical strength and toughness.
Bamboo is a typical hierarchical material.
As a functionally graded material, bamboo changed its mechanical properties along the cross section.
Acknowledgements The work was supported by the National Natural Science Foundation of China (10672130 and 10972173).
Xian: Journal of Bamboo Research Vol. 9 (1990), p. 10 (in Chinese) [14] W.Liese and G.Weiner: Wood Sci.

Material and Methods The goal of the study was to construct an integrated system that encompasses different modules, including pulse generation, timing, skin-electrode interface, and the case design of the unit.
Rasheed, “An artificial blood, electron microscope image, support, principles, benefits, and fusion methods: a review,” in IOP Conference Series: Materials Science and Engineering, vol. 870, no. 1.
HASAN, “Noninvasive acousto-optic glucose sensing system for diabetic covid-19 patients,” Journal of Engineering Science and Technology, vol. 16, 2021
Behm, “The addition of transcutaneous electrical nerve stimulation with roller massage alone or in combination did not increase pain tolerance or range of motion,” Journal of Sports Science & Medicine, vol. 17, no. 4, p. 525, 2018
Hynd, “Electro-analgesia for sheep husbandry practices: a review,” Animal Production Science, vol. 57, no. 5, pp. 801–810, 2016

Woven fabric bioreactor (WFBR)as the filter material for wastewater treatment Qi Yang1, Zhenhong Liu 1, a, Xia Sheng 1 1School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China a Corresponding author email: zhhl @dhu.edu.cn Keywords: Membrane bioreactor; Woven; wastewater treatment.
In this study, effective particle removal can be achieved by using woven fabric instead of nonwoven as the filter material.
Mishing, in: Diffusion Processes in Advanced Technological Materials, edtied by D.
Clem: submitted to Journal of Materials Research (2003) [6] P.G.
Chinese Environmental Science Publishing House, Beijing, China

Acknowledgements The present research was partly funded by 2011Special S&T Project of Zhejiang Ocean University(21035032011); S&T Major Project of Zhejiang Provincial Science and Technology Department(2009C03008-3); The Zhejiang Provincial Natural Science Fund Projects of（Z200906153）& (Y5100054); Zhejiang Province Science and Technology Public Technology Research and Industrial Projects(2011C21006);The National Natural Science Fund Projects（51079129）.
Chen.Torsion Vibration Calculation of Ship Shaf ting and Its Text Example Analysis.Journal of Ship Engineering. 2002,p.1
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The Numerical Simulation and Analysis of Wind Pressure Distribution on Sloping Roof of Storey Factory Tingwei Zhou1, a, Chengwei Huang2,b, Jian Zheng3,c 1Faculty of Civil Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500,China 2 Faculty of Civil Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500,China 3 Faculty of Civil Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500,China a574443827@qq.com, b1149506270@qq.com, c2607649586@qq.com Keywords: Storey factory; Roof pressure; Numerical simulation; Abstract: As wind-induced damage always occurs at the roof of storey factory, the roof pressure of storey factory under different wind directions was analyzed based on the Realizable k-ε turbulence model.
Introductions With the rapid development of building materials with light-weight and high-strength, the sensitivity of roofing material is stronger for wind loads.
Wind pressure on tropical housing [J], J.Wind Engineering and Industrial Aerodynamics.1994, 53(1/2) ：105-123 [3] Uematsu.Y, Isyumov.N.Review wind pressure cating on low-rise buildings [J].Journal of wind Engineering and Industrial Aerodynamics. 1999, 82(1/2/3) ：1-25 [4] Hui Wang, Shuifu Chen, Jinchun Tang, Numerical simulation of wind pressures on low-rise building with gable roof[J], Journal of Zhejiang university（Engineering science）, 2003, 36(6):634-638(In Chinese) [5] Shih T H,Liou W W,Shabbir A,Yang Z G,Zhu J.A new k-ε eddy viscosity model for high Reynolds number turbulent flows.Com-put Fluids. 1995.24(3):227-238 [6] Qingya Li, Jihong Ye, Numerical Simulation of Characteristics of Mean Wind Pressure Distribution and Flow Field on Typical Spatial Structures, Journal of Architecture and Civil Engineering, 2008,Vol.25:76-83.