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Impedance, phase angel and dissipation factor are the key performance parameters of AC electrical properties.
International Journal of Polymetric Material, 1976, 5: 233-238 [8]J.Yacubowicz, M.Narkis.
Polymer Engineering and Science, 1990, 30: 459-468
Polymer Engineering and Science, 1998, 38: 471-477
New scaling for ac properties of percolating composite materials.

It was thought that the volatilization of water-soluble potassium and sodium was the main release way during pyrolysis process[[] Chunjiang Yu, Yanling Tang, Mengxiang Fang et al.: Journal of Zhejiang University (Engineering Science) Vol. 39 (2005), p. 1435-1438,in Chinese. ].
Straw rich in K and Na was chosen as the experimental material in this study.
In the biomass entrained-flow gasification, the total yield of gaseous and solid products was about 90%[[] Jinsong Zhou, Hui Zhao, Xiaowei Cao et al.: Journal of Zhejiang University (Engineering Science) Vol. 43(2009), p. 128-134,in Chinese. ].
With the addition of additives, there were more or less flocculent materials on the ash surface.
And the residence time of the raw material and additives in the gasifier was too short to have a complete reaction.

IYA 1, d . 1 Department of Agricultural Engineering, Federal University of Technology, Yola- Nigeria 2 Department of Agricultural Engineering, Bayero University Kano - Nigeria 3 Department of Agricultural Engineering, Ahmadu Bello University, Zaria - Nigeria a fatimaud@yahoo.com, b dralimohd@yahoo.co.uk, cabdullahielokene@yahoo.com and d us5iya@yahoo.com.
Materials and Method The following factors were considered: Sample factors: Seven tiers of Samnut - 10 varieties were purchased.
Thesis Submitted to the Department of Agricultural Engineering, Ahmadu Bello University , Zaria(1997)
Engineering, Ahmadu Bello University, Zaria(2000).
Project Submitted to Department of Agricultural Engineering, Federal University of Technology , Yola. (2005)

Measures for improvements For the abovementioned environmental defects, wood and bamboos can be used as the main materials for the enclosing structure, since these materials are abundant, light weight and good flexibility; meanwhile, mud can be applied onto the wall to enhance the thermal-insulating and sound-insulating effect of the rooms.
The key reason is that insulation measures are applied on the wall mainly, but not on the roof.
Atlanta: American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc.1992 [5] Tsinghua University Building Energy Research Center. 2008 Annual Report on China Building Energy Efficiency.

Momade3,c 1,2Department of Industrial Art (Ceramics) 3Department of Materials Engineering Kwame Nkrumah University of Science and Technology, Kumasi, Ghana alemuelgbologah@yahoo.com, bparpahkaye@yahoo.com, cfmomade@yahoo.com [Date received: 05 January 2012.
Carbon-Carbon composite (C/C) substrate materials are prone to severe oxidation and volatilization problems.
A practical approach to solve this problem is to protect such materials by surface coatings with refractory oxide materials.
The surface roughening, however, reduces the fracture strength of the coated materials.
Galasso, Deposition of improved SiC coatings on carbon-base materials, U.S.

Materials.
Procedia Engineering, 135 (2016) 393–402.
Journal of Achievements in Materials and Manufacturing Engineering, 1/91 (2018) 27–33.
Procedia Engineering, 218 (2018) 142-148.
Key Engineering Materials, 927 (2022) 53–62.

0D Zn-ZIF/2D Co-ZIF Derived 0D ZnO/2D Co3O4 Heterostructures for ppb-Level Acetone Detection Xiao Chang1,a, Ya Xiong1,b and Qingzhong Xue1,c* 1State Key Laboratory of Heavy Oil Processing, School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, Shandong, P.
Table 1 Acetone sensing properties of different sensing materials.
Materials T (°C) Concentration (ppm) Response Reference Co3O4 hollow nanospheres - 1000 8 [26] Co3O4 nanocubes 200 100 3 [27] Co3O4/ZnO 400 1000 20 [28] porous Co3O4 nanosheets 150 100 6 [29] Co3O4 Hollow nanocages 350 5 1.45 [13] 0D ZnO/2D Co3O4 250 5 4.7 This work 0D ZnO/2D Co3O4 250 100 16.8 This work Compared with pure 2D Co3O4, 0D ZnO/2D Co3O4 exhibits more excellent acetone sensing properties, which can be attributed to the formation of 0D ZnO/2D Co3O4 heterostructures.
Therefore, 0D Zn-ZIF/2D Co-ZIF derived 0D ZnO/2D Co3O4 heterostructures can be a promising acetone sensing material.
Zhang, Metal-organic frameworks-derived hierarchical Co3O4 structures as efficient sensing materials for acetone detection, ACS Appl.

Effects of CuCl Source and Content on Direct Synthesis of Triethoxysilane from Silicon and Ethanol Zhang Lei; Li Ji; Yang Kai; Hu Chenfa; Ge Shibin; Yang Chunhui* School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, Heilongjiang 150001, People’s Republic of China E-mail: yangchh@hit.edu.cn Tel: 086-045186413707 Fax: 086-045186314858 Keywords: Direct Synthesis; Triethoxysilane; Effects of CuCl sources; Effect of CuCl concentration; Gas-solid Stirred Fluidized Bed Abstract: Effect of CuCl source and content on formation of triethoxysilane in the direct process is described and discussed.
The direct process is a key step in the synthesis of silicon-containing materials, such as silicone polymer and numerous organosilicon chemicals.
Experimental 2.1 Materials and methods Technical-grade silicon, Sitech (Anyang DX Silicon Industry Co., Ltd.), was used and its impurities were listed in Table 1.
Other materials were used in the reaction including ethanol (Sinopharm Chemical Reagent Co., Ltd, 99.8%) and two sources of CuCl ( one was prepared by wet process, as described in Ref [21], and the other was from Sinopharm Chemical Reagent Co., Ltd, 99 %).
The η-Cu3Si acted only as potential active material.

The preferred coating method for depositing such coatings is sputter PVD due to the very smooth surface of the coatings, the low coating defect density and the flexibility in the coating material selection.
The substrate used in the present work is the CTN01L type cemented tungsten carbide made by Ceratizit Luxembourg, which was developed specifically as a precision glass molding tool material.
Such a change in weight occurs when the material of the samples oxidizes, as oxygen from the atmosphere gets incorporated into the material.
Since hot glass tends to oxidize materials that come in contact creating strong bonds, good resistance to oxidation at high temperatures is important for prolonging tool lifetime.
Hwang: Design of Protective Coatings for Glass Lens Molding, in: Key Engineering Materials 364-366 (2008) p. 655-661 [6] C.

Experimental Study of Laser Welding Process and Properties of 2205 Duplex Stainless Sheet Steels Shanshan Hua *, Bitao Yangb, Bodong Zengc, Dongrui Zhengd and Zili Yange College of Mechanical Engineering, Guangxi University, 530004 Nanning, PR China achloee_2000@163.com, bsngrdidt2010@126.com, c834077721@qq.com, d215574085@qq.com, e1942321150@qq.com Keywords: Laser welding, 2205 Duplex stainless steel, Mechanical behavior, Microscopic structure.
Introduction Laser welding is a kind of material connection technology.
It uses the focused laser beam with high-energy-density as the welding resource to heat the surface of the welding workpiece, the metal materials absorbing heat and raising the temperature to a degree to melt metal rapidly, during which molten pool forms, subsequently cools and solidifies to form welding joint [1].
Welding Experiments Test Materials.
Alloy elements of the material was shown in Table 1.