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Microstructure and Texture Evolution of Repetitive Upsetting-Extruded (RUEed) Mg-Gd-Y-Zn-Zr Alloy after Hot Compression Beibei Donga, Zhimin Zhangb*, Jianmin Yuc and Xin Ched College of Materials Science and Engineering, North University of China, 3 Xueyuan Road, Taiyuan 030051, China aB1803009@st.nuc.edu.cn, bzhengzhimin@nuc.edu.cn, cyujianmin@nuc.edu.cn, dB1803007@st.nuc.edu.cn Keywords: deformation temperature; compression tests; Mg-Gd-Y-Zn-Zr alloy; dynamic recrystallization (DRX) Abstract.
As the lightest high strength materials, magnesium alloys are very attractive in applications for the automotive, railway and aerospace industries [2-4].
The true stress-true strain curve of the material is a macro manifestation of the microstructure change.
Acknowledgements This work was financially supported by “the Natural Science Foundation of Shanxi Province” (No. 201901D111176), “Key R&D program of Shanxi Province (International Cooperation)” (No. 201903D421036), and “Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi” (No. 201802072) and “Shanxi Graduate Education Innovation Project” (No.2020BY092).

Crack Position Recognition of Metal Deep Drawing Parts Based on BP Neural Network XU JiYong1,a, ZHAO JunLi2,b, ZHAO Bing2, SHAO YingQing2 1Jinshan Vocational and Technical College, Yangzhong, Zhenjiang, Jiangsu,P.R China 2School of Mechanical Engineering, Jiangsu university, Zhenjiang, Jiangsu,P.R China axufanli2006@126.com, bzhaojunli_2006@126.com Key words: BP neural network ; the drawing parts; acoustic emission signal; location identification.
Acoustic emission (AE) is a material or a structure of the internal local area under the influence of external forces, internal forces, or temperature.
Artificial neural network in the detection of crack location has great potential, especially suitable for the material anisotropy and structural complexity [3].
Drawing part's structure and the position of producing crack The material of deep drawing parts is the metal sheet ST14, The diameter of the blank size is 153 mm, the thickness of the sheet metal is 1.4 mm, the biggest drawing depth is 38 mm.
Fundamentals of material forming technology[M].Second edition .Beijing: Higher Education Press, 2010

Isolation and Identification of Photosynthetic Bacteria and Their Hydrogen Production Characterization Yanyan Zhu, Quanguo Zhang, Binxu Han ,Yanyan Jing (College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou, 450002, China) *Corresponding author: zquanguo@163.com Key words：photosynthetic bacteria；hydrogen production；isolate； Abstract: Using special culture medium, dominant photosynthetic bacterias were enriched from sewage silt and paddy fields with plentiful light and organic compounds.
Pure strain has many shortcomings, such as, high sterilization cost, easily being polluted by miscellaneous bacterium, difficult to preserve strains, material using monotonously.
Photosynthetic bacteria in mixing strains have different light absorption spectrum, property of raw material and strains coordinating efficiency[2,3].Therefore, mixing strains possessed high utilization of material and high efficiency of producing hydrogen.
Materials and methods Strains Bacteria source was extracted from animal manure and high organic content of sewage sludg in the surrounding areas of Zhengzhou , and of separated and enriched under illumination.

The research of economic evaluation model for construction conserves energy retrofitting technology of existing buildings Guoqi Xing1, a, Weiwei Wang 1,b 1 Architectural Engineering Institute, Weifang University, Weifang, Shandong, 261061, China axgq1105@163.com, bwangweiwei1008@yahoo.cn Keywords: Existing Buildings, Payback Period OF Dynamic Energy, DeST-h Software, conserves energy Simulation.
After deciding energy consumption information of existing building it should definite several key indicators before using the model to make economic analysis.(1)Remaining life cycle of existing building.
The residential building is north-south direction and is brick and concrete structure, 6 layers and storey 3m; The ratio of window area and wall area is 0.6, total area of exterior wall is 743m2 and total area of windows is 459m2,total living area is 1263m2.The palisade structure materials and heat transfer coefficient is shown in table 1.
Fig. 1 building floor plan of residental Table 1 Initial parameters of palisade structure materials Building component of palisade structure Material and tectonic Heat transfer coefficient (W/(m2·K)) Exterior wall 240mm brick wall 1.88 Interior wall 240mm brick wall 1.88 Roof 120mm precast concrete slab 3.71 Floor 120mm precast concrete slab 3.80 Door and window Ordinary aluminium alloy window 6.40 Conserves Energy Retrofitting Scheme.

Banana (Musa acuminate) peels were sourced locally at Sango Ota market, Ogun State Nigeria and transported to Mechanical Engineering Department.
The composite materials were then cut into specific sizes and forms after solidification for various additional analyses.
Ezechi, et al., ‘Municipal solid waste management in Aba, Nigeria: Challenges and prospects’, Environmental Engineering Research, 22,3 (2017) 231–236
Results in Engineering 5 (2020): 100090
Corn and Rice Starch-Based Bio Plastics as Alternative Packaging Materials. 7(4), 32. https://doi.org/10.3390/fib704003

Zhong State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials, School of Material Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China (zgq316@163.com) Keywords: amino acid Schiff base, solvent-free synthesis, thermal decomposition, zinc complex Abstract: Three zinc(II) complexes of the amino acid Schiff base were synthesized by the one step reaction of amino acid with aldehyde, zinc acetate in solvent-free.
As a functional material, the zinc complexes of Schiff base have been widely used in industry and pharmacy [7].
Experimental All chemicals used in the experiments are analytical or biochemical reagents as received from commercial sources with no further purification. 0.5559 g (5 mmol) leucine and 0.2806 g (5 mmol) KOH were weighed and pestled until they became moist in agate mortar for 1 minute. 0.52 mL (5 mmol) freshly distilled salicylaldehyde was dropped into agate mortar with uninterruptedly pestling, the color of the starting material turned to yellow quickly, stop the grinding after 30 minutes later, the amino acid salicylaldehyde Schiff base was synthesized completely at the first step.

The low relaxation prestressing steel strands of 22mm diameter and 1´19 shares were used as cable materials, and the length was 5000mm with lengthening anchorage by resin capsules.
(3) The irrationality of original supporting parameters Through the field investigation, the paper pointed out that the low pre-tension of the original support system and the irrationality of auxiliary support components were the main reasons for the failure of roadway support, concrete analyses could be described as follows. ① The low support strength The material of the bolts used at Hongmiao Colliery was 20MnSi, and the diameter was 18mm.
High-strength and low relaxation prestressing steel strands of 22mm diameter and 1´19 shares were used as cable materials, and the length of cable was 4300mm with combined anchorage of resin capsules and cement.
While the high prestress and intensive bolt-cable support system pointed out that the prestress was the key parameter, the overlap area of high compressive stress could be formed in the loose and soft surrounding rocks by substantially enhancing prestress and diffusing prestress with the help of auxiliary support components.
Chinese Journal of Rock Mechanics and Engineering, vol. 29 (2010), p. 649.

A promising area of the science and geo-engineering is to obtain nanomaterials that are safe in use, active absorb light in the visible range, have good efficiency, and economic continuity.
Nanodisperse titanium dioxide seems to be the most widely used material in photocatalysis, since it is chemically inert and exhibits minimal toxic effects towards living organisms [2, 3].
Thus, an increase in the service life of the material, an expansion of the range of absorbing light, and a change of the texture parameters such as porosity and particle size of the materials are achieved.
Thus, the use of TiOX in the synthesis of TiOX/CdS heterostructures can significantly affect the properties of the resulting material.
Svetlichnyi, Spectral-Luminescence Properties of Water Dispersions of CdS and Ag Nanoparticles Stabilized with Na2SiO3, Key Eng.

Synthesis of Chiral Polysiloxane via Hydrosilylation between Synthesized Hydrogen-Containing Polysiloxane and a Chiral Unsaturated Amide Xiaoning Zhang1,2, a, Jinshui Yao1,2,b and Xijun Sun1,2,c 1School of Material Science & Engineering, Shandong Polytechnic University, Daxue road, Jinan250353, China 2Shandong Provincial Key Laboratory of Performing and Testing Technology of Glass & Functional Geramics aemail: 0524102801@163.com, bemail: yaojsh@spu.edu.cn, cemail: shuang.yu.1986@163.com Keywords: Hydrogen-containing polysiloxanes, Chiral polymers, Viscosity-average molecular weights, Active hydrogen content, N-[(1S)-1-phenylethyl]prop-2-enamide, Hydrosilylation Abstract.
It is well known, with chiral carbon atoms or asymmetrical factors existed, chiral polymers are regarded as a new kind of functional polymers, which are commonly used in chiral separation[5,6], optoelectronic materials[7], liquid crystal[8], etc.
Experimental Materials.

Guangzhou China, 510430 381200308@qq.com Key words: slender bar; cutting parameters optimization; improved artificial bee colony algorithm Abstract: Improved artificial bee colony algorithm is proposed to solve the problem that how to select proper cutting parameters in multi-processing of slender bar in this passage.
According to Taylor formula, tool life Tr and Tf are expressed as the following two formulas: (11) in the above formula, CT represents coefficient of tool life, which is subjected to tools, materials, processing and cutting conditions.
The cutting tool is YT15 carbide, the tool geometry parameters are shown in Table 1, processing parameters are shown in Table 2, and processed material is 45 steel rod.
Modern manufacturing engineering, 2006(10):37～38 ( In Chinese) [4]N.
International Journal of Machine Tools & Manufacture. 2007，47:900∼919 ( In Chinese) [5]Qiang Wang .Advanced Materials Research，2011(8):418-420 ( In Chinese)