Search results

Measurement of the Incident Sound Power in Ducts and Effect factors Analysis Zhao Hai-jun1，a ，Deng Zhao-xiang2，b 1 Department of Mechanical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China 2 State Key Laboratory of Automotive NVH and safety control，Chongqing 400039, China ahjzhaoly@sina.com, bzxdeng@equ.edu.cn Keywords: Incident sound power, Effect factor, Two-microphone method Abstract: Based on two-microphone transfer function method, the measuring method of incident sound power in duct is introduced, The special test equipment is built, and the test and measurement program of incident sound power in duct is written, and effect factors of measurement are analyzed.
The method was used to measure sound absorption coefficient, acoustic impedance of materials and transmission loss of mufflers.
Two material specimens were tested using the two methods, the results of the analytical and numerical uncertainty methods showed good agreement [4].
When M is 0, it is a condition with no flow, acoustic characteristics of materials and mufflers are often tested in this condition.

Study on Geomorphologic Spatial Information Mining and Application Liheng Liang 1, a, Lixin Xing 1,b ,Tonglin Li 1,c , Hongyan Jiang2,a, Lijun Jiang 3,d 1 College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China 2 Institute of Geographic Information Engineering of Jilin Province, Changchun 130051, China 3 College of Earth Sciences, Jilin University, Changchun 130061, China asignllh@hotmail.com, bxinglx@jlu.edu.cn, clilaoshi@163.com, djianglijun_2002@163.com Key words: Digital geomorphology; Partial quartic equation; Spatial Analysis; Shuttle Radar Topography Mission (SRTM) Abstract.
Earth’s surface shows significant regional differentiation on account of morphological features, force types and the role of nature, material composition and formation age, thus, it forms different landscape patterns, and these spatial patterns to some extent reflect geomorphologic formation and evolution law.
Materials and method Study area.
Since the Mesozoic era the Neocathaysian tectonic system has controlled the deposition of material and the landscape pattern including the topographic and geomorphologic features (Li, 2004).
Fig.3 Maximum elevation value map Fig.4 Minimum elevation value map The classification of landforms mainly include morphology, the composition of the original material, the formation year and so on, the elevation of the geomorphologic surface and the relative local relief of the land surface are the most basic morphological index and they also indicate the landforms’ endogenic force effect and characteristics in macroscopic.

Evaluation of Oxidative Stress Responses and Neurotoxicity Potential of Methamidophos in Mytilus edulis Yu Zhen1,Jiang Aili2 Department of Biochemical Engineering,Yantai University,Yantai, Shandong Province,China 1Yuzhen5627@163.com,2jal9035@163.com Keywords :Acetylcholinesterase; CAT; GPx; Na+-K+-ATPase; SOD.
The key enzymes for the detoxification of reactive oxygen species in all organisms are superoxide dismutase (SOD, EC 1.15.1.1), catalase (CAT, EC 1.11.1.6) and glutathione peroxidase (GPx, EC 1.11.1.9).
II.Materials and Methods A.
Biological Materials Live specimens of M. edulis, each weighting about 9-10 g, and belonging to the same growth level, were collected from shallow waters of an unpolluted site during May – June, 2007 along the Yantai coast of the Yellow Sea.
Contamination of a dredged material disposal site (La Rochelle Bay, France).

Microstructure and Mechanical Properties of Hyper-Interfacial Bonded Joints of Ultra-Fine Grained High Strength Steels Kazutoshi Nishimoto1, Kazuyoshi Saida2 and Boyoung Jeong3 1 Department of Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka 565-0871 Japan, nisimoto@mapse.eng.osaka-u.ac.jp 2 ibid., saida@mapse.eng.osaka-u.ac.jp 3 ibid., boyoung@mapse.eng.osaka-u.ac.jp Keywords : Hyper-interfacial bonding, Fusion welding, Ultra-fine grained steels, Microstructure, Hardening/softening, Grain growth, Tensile properties, Impact absorbed energy Abstract.
On the other hand, from a practical viewpoint, welding and joining techniques for the UFG steel are indispensable for being used it as structural materials.
However, the material properties of the heat affected zone (HAZ) in the UFG steel weldment fall down less than the base metal due to the grain growth and softening by weld heat input.
Materials and experimental procedures The chemical composition of the UFG steel used in this study is shown in Table 1.
The width of the HAZ Fig.5 Hardness distribution in hyper-interfacial bonded and fusion welded joints of UFG steel 200 250 300 350 400 450 -2 -1 0 1 2 3 4 5 6 7 Melted zone A AA Distance from bonding interface (mm) Hardness (Hv4.9) TIG welding CO2 laser welding Electron beam welding Hyper interfacial bonding UFG-T steel A Fig.4 TEM microstructure of MA constituent in hyper-interfacial bonded joint of UFG steel 500nm 000 220 220 111 311 111 222 222 311 131 131 402 402 042 440 531 622 042 444 624 804 110 110 020 220 130 110 200 310 110 220 020 130 200 310 Dark field image (martensite) Bright field imageDark field image (austenite) Diffraction pattern Key diagram α' Beam//[0 0 1]α' Beam//[1 1 2]γ α γ Fig.6 Distribution of grain size in hyper-interfacial bonded and fusion welded joints of UFG steel TIG welding CO2 laser welding Electron beam welding Hyper-interfacial bonding A A A A AAAA 178µm ; near fusion

Finite Element Analysis of Reinforce RC Beams Considering Loading History with Pre-Stressed CFRP Sheets Xianpeng Liu 1, a Chang Guo 1, b 1 Key Laboratory of Harbor Marine Structure Safety, Ministry of Communications, Tianjin 300456, China a tiankesuo@163.com (Corresponding Author), b rickguo722@gmail.com Keywords: Prestressed CFRPplate, Secondary load case, Reinforcement, Finite element analysis Abstract.
Table 1 Material Performance Mean Value Index of Concrete Compressive strength[Mpa] Tensile strength[Mpa] MOE [Mpa] 28.6 2.8 3.2E4 Table 2 Performance Mean Value Index of Rebar Material Rebar Diameter [Mpa] Yield Strength [Mpa] MOE [Mpa] 10 319 2.0E5 16 359 2.1E5 Table 3 Performance Mean Value Index of CFRP Plate Material Width[mm] Thickness [mm] Tensile strength [Mpa] MOE [Gpa] 50 1.4 2200 151 Note: Refer to the original data in experiment, combine with the mean value index of low MOE CFRP plate, and take the coefficient of thermal expansion of CFRP plate as 0.6E-6.
Conclusions In this chapter, in combination with the second stress condition in actual engineering, in consideration of external load effect on the rebar-concrete beam, and on the basis of relevant physical experiment data, the establishment of (finite element method) FEM analysis which is able to calculate the prestressed CFRP plate reinforced rebar-concrete beam under the condition of second stress has been studied, which reaches the following research conclusion: (1) According to relevant physical experiment data material, the method of life-death unit controlling and multi-step stress loading is chosen to simulate the second stress process of the reinforced beam.
When the beam is damaged, the material strength of the CFRP plate can be fully exerted

Midson2,d, Qiang Zhu3,e and Jianzhong Fan1,f 1General Research Institute for Nonferrous Metals, Beijing 101407, China 2Colorado School of Mines, Golden, Colorado, 80401, USA 3Department of Mechanical and Energy Engineering, Southern University of Science and Technology, 518055, Shenzhen, China alm_grinm@163.com, b*lidaquan@grinm.com, cquwenying2008@163.com, dsmidson@mines.edu, ezhuq@sustc.edu.cn, fjzfan@grinm.com Keywords: SEED, ProCAST, Semi-solid diecasting, Temperature distribution, Heat transfer Abstract.
The material of the slug was aluminum alloy 357 (Al-7Si-0.6Mg), the thermal and physical characteristics of which were calculated by ProCAST using the Scheil model.
The material of crucible was 4140 steel, the thermal and physical characteristics of which was calculated by ProCAST by Scheil model.
Acknowledgement Financial support from the National Key Research and Development Program of China (N0.2016YFB0301001) and Shenzhen Science and Technology Innovation Commission under project (No.
Li, et al., Application of CAFÉ Method on Microstructure Simulation of Semi-solid Al–7%Si Alloy, Chinese Materials Conference 2017 (2018) 819-827

Srivatsan 1, Satish Vasudevan1, Lisa Park2 1 Division of Materials Science and Engineering Department of Mechanical Engineering 2 Department of Geology The University of Akron Akron, Ohio 44325-3903 E-Mail: tsrivatsan@uakron.edu R.J.
Miller: Fatigue of Engineering Materials and Structures, Vol. 5, 1982, pp. 223-232. 10.
Lankford: Fatigue of Engineering Materials and Structures, Vol. 5, 1982, pp. 233-248. 11.
Starke, Jr.: Materials Science and Engineering, Vol. 29, 1977, pp. 99. 13.
Lesuer: Materials Science and Engineering, A334, 2002, p. 104 14.

The Current and Future States of Ethiopia’s Energy Sector and Potential for Green Energy: A Comprehensive Study Baseem Khan1,a*, Pawan Singh2,b 1School of Electrical & Computer Engineering, Institute of Technology, Hawassa University, Ethiopia 2School of Informatics, Institute of Technology, Hawassa University, Ethiopia abaseem.khan04@gmail.com, bpawansingh3@yahoo.com Keywords: Electricity access, renewable energy, rural electrification, regulatory framework, sustainable development Abstract.
The key factors which affect the development of energy sector such as international energy export, policy framework, role of government and regulatory framework are also discussed.
Key challenges in Ethiopian energy sector.
Solutions to the key problems.
In the last few years, the developments in the technologies of solar panels have reduced the manufacturing cost and materials cost for PV panels; this has increased the use of solar panels in different rural areas as well.

Development of Ag Nanotwinned Film Coated Pre-formed Silver Sintered Sheets for the Die Bonding of SiC Chips with DBC Ceramic Substrates Tung-Han Chuang1,2,3a*, Jim Wang4,b, Yin-Hsuan Chen1,c, Chun-Hao Chen5,d, Ang-Ying Lin1,e, Jing-Yao Chang6,f, Jung-Hsuan Chen6,g and Wei-Chung Huang6, h 1Institute of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan 2Ag Materials Technology Co.
It was also sponsored by the industrial and academic cooperation programs of National Taiwan University, National Yang-Ming Chiao-Tung University (NSTC 113-2622-E-A49-024), Ag Materials Technology Co.
Ismail, “Kinetics of the reaction of CO2/CO gas mixtures with iron oxide,” Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, vol. 41, no. 4, pp. 824–832, Aug. 2010
Lin, ‘Lattice buffer effect of Ti film on the epitaxial growth of Ag nanotwins on Si substrates with various orientations’, Materials Characterization, 167, pp. 110509, 2020
Chuang, "Growth of Cu nanotwinned films on surface activated SiC chips," Journal of Materials Science: Materials in Electronics, vol. 34, no. 23, p. 1677, 2023

Leung 2,c 1 Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China 2 Department of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong a slxu@dlut.edu.cn, bxiufangzhang_cn@yahoo.com.cn, cckleung@ust.hk Keywords: Ultra-high toughness cementitious composite, UHTCC/RC composite beam, RC beam, flexural behavior, crack width, reinforcement ratio Abstract: Ultra-high toughness cementitious composite (UHTCC) exhibits the pseudo-hardening feature when subjected to tensile load and has high tensile strain capacity of normally up to 3%.
The strain hardening engineered cementitious composite recently proposed by Victor Li [1], is generally regarded as one of the most promising construction materials for controlling crack width of structural elements.
(a)UHTCC (b) concrete (c) steel bar Fig.1 Materials constitutive relationship For steel bar, stress hardening after yielding is not considered.
Based on cracking in the two materials concrete and UHTCC, there are two possible cases for computing the cracking moment of the composite beam.
Acknowledgement This research is financially supported by the Key Program of the National Natural Science Foundation of China (No. 50438010).