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Simulation Study of Damage Identification Method based on Lamb Wave Scattering in Aluminium Plate Zhenhua Tian, Hongyuan Li and Hong Xu Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education North China Electric Power University Beijing 102206, China E-mail: tian_zhenhua@ncepu.edu.cn Keywords-Lamb wave; time-frequency analysis; damage identification; finite element method Abstract—The propagation of scattering Lamb wave in plate was simulated using transient dynamic analysis in ANSYS.
Material Properties Material Young’s modulus Poisson’s ratio Density E (GPa) ν ρ(kg/m3) Alloy 71 0.33 2700 TABLE II.
Rose, “Guided wave simulation and visualization by a semianalytical finite element method,” Material Evaluation, vol. 61, 2003, pp. 75–79
Chapra, Applied Numerical Methods with MATLAB for Engineers and Scientists, 2nd ed., McGraw-Hill Inc., 2008.

Methods Taking Grifola frondosa as material, the mycelium was broken by ultrasonic, and then centrifugated, the supernatant was collected, GS was precipitated by different concentrations of ethanol, ammonium sulfate and acetone, the suitable isolation method of GS was researched out by taking enzyme activity and protein content as parameters.
In this paper, Grifola frondosa was taken as material, grifolan synthase was successfully isolated firstly, and its partly enzymatic properties were studied.
MATERIALS AND METHODS MATERIALS Strain: Grifola frondosa, from Fujian Sanming Institute of Fungi.
Acknowledgements The research work was funded by the Commission of Science and Technology of Henan Province (CSTHP), the Program for Tackling Key Problems, programs No.112102310326 and the Commission of Education of Henan Province (CEHP), the Science Foundation Program, programs No. 2011A180007; Henan University of Technology, special program of introducing persons of ability No.2007BS023.
Biochemical Engineering Journal, 38(2008)198-205

Effect of Multipass Welding in the Phase Balance of Dissimilar Duplex Stainless Steel Joint Using Double-Pulsed Gas Metal Arc Welding Mariana Poliserpi1,2,a*, Pere Barriobero-Vila3,b, Gerardo González1,2,c, Sebastián Zappa2,4,d, Mónica Zalazar1,e, Hernán Svoboda2,5,f 1Applied Mechanics Department, National University of Comahue, Buenos Aires 1400, 8300, Neuquén, Argentina. 2CONICET-National Scientific and Technical Research Council, CABA, Buenos Aires, 1033, Argentina 3Technical University of Catalonia (UPC), Department of Materials Science and Engineering, Eduard Maristany Av. 16, 08019 Barcelona, Spain. 4Faculty of Engineering, National University of Lomas de Zamora, 1832, Lomas de Zamora, Buenos Aires, Argentina 5Welding Technology Group (GTSyCM3), INTECIN, Faculty of Engineering, National University of Buenos Aires (UBA)-CONICET, CABA, 1127, Argentina.
Materials and Methods Plates of 2205 DSS and a 2101 LDSS (6.5x150x200 mm3) were welded using the semi-automatic process GMAW-DP with a metallic backing and Ar (Q = 16 l/min) as shielding gas.
Conflict of interest The authors declare that they have NO affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript.
Wang, Microstructure, pitting corrosion resistance and impact toughness of duplex stainless steel underwater dry hyperbaric flux-cored arc welds, Materials 10 (2017) 1443
Woods, ASM International, Materials Park OH, 1993

Engineering structures 19 (1997) 718
Ocean engineering 38 (2011) 329
Earthquake Engineering & Structural Dynamics 29 (2000) 1131-1152
Journal of Structural Engineering 132 (2006) 1491-1501
Inverse Problems in Science & Engineering 18 (2010) 997-1021

The article discusses the spatial analysis of the chemical soil properties that is a key component of the agriculture ecosystem based on satellite images.
Al-Wali, 2018 [14] built an engineering scale to classify the chemical soil degradation of the soil of the study area, which is located in the south of Babil Governorate, by using geomatical techniques and calculating some salinity and soda indicators responsible for this phenomenon.
Materials and Methods The location of the study region: The study region (Sanam mountain-Al Zubair) is located in the southwestern part of Basra province in southern Iraq, within Al-Zubair district between latitude (30° 26´ 56.18” to 30° 7´ 15.40”) N in the north, and longitudes (47°26´11.42” to 47°47´26.60”) E in the east, and its area is (1127) km2.
Knutsson, "Geomorphology, Geology and Tectonics of Jabal Sanam, Southern Iraq," Journal of Earth Sciences and Geotechnical Engineering, vol. 7, no. 3, pp. 97-113, 2017
Muhammed, "Practical environmental engineering (water assays)," Dar al-Hekma, pp. 50-89,255-258, 1990

Vibration of transformer core brings risks of cellulose, used in transformer insulating materials, degradation, loosening of bolts and adjacent elements, acoustic noise [3].
Materials and methods Generator stator under study.
The stator core is built up of silicon steel plates, insulated on both sides with a special varnish and fastened to the frame by means of dovetailed keys [1].
Vitols, Stator Core Vibration and Temperature Analysis of Hydropower Generation Unit at 100 Hz Frequency, in Proceedings of Conference “Engineering for rural development”, Jelgava, 2015, pp.383-388
Harlow, Electric power transformer engineering, CRC press, 2004

Effect of Additive on the Performance of PVDF Membrane Via Non-Solvent Induced Phase Separation Xiaohui Cao1, a, Ming Qiu1, b, Aiwen Qin1,c, Chunju He2, d and Haifeng Wang2, e 1College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China 2The State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, China a879897955@qq.com,b1029890778@qq.com,c2695588281@qq.com, dchunjuhe@dhu.edu.cn,ewhf2008@dhu.edu.cn Keywords: Polyvinylidene fluoride (PVDF), 1, 2 - propylene glycol, non-solvent induced phase separation (NIPS).
Introduction Poly(vinylidene fluoride) (PVDF) has received great attention as a membrane material with regard to its outstanding properties,i.e.high mechanical strength, thermal stability, chemical resistance, as compared with otherpolymeric materials.
The addition of hydrophilic materials tothe dope solution increases the water permeability of a membrane with similar pore size and pore distribution due to anincrease in pore density as well as in the hydrophilicity ofthe membrane surface and inside the pores [2,3].
Additional organic materials that canimprove PVDF membrane properties include polymethy acrylate (PMA) [6,7], polyvinyl acetate (PVAC) [8], and cellulose acetate (CA) [9].The addition of organic hydrophilicmaterials can improve some properties of membranes, but reducesmembrane strength.
Experimental Materials.Polyvinylidene fluoridewas supplied by 3F Company and dried at 100℃ for 24h before use. 1, 2 - propylene glycoland DMAc were obtained from Sinopharm Chemical Reagent Co, Ltd.

A Frequency Reconfigurable Fractal UWB Antenna Using Ground Stub and PIN Sumit Kumar Gupta1,a*, Bhawna Shukla1,b, Soma Das1,c 1Department of ECE, School of Studies of Engineering & Technology, Guru Ghasidas Vishwavidyalaya Bilaspur.
Materials and Methods 2.1 Antenna Design and characteristics The design of compact ultra-wideband antenna which can work for cognitive radio applications and sub 6 GHz applications in S and C band with essential reconfigurable characteristics is shown in Figure 1.
Similar behavior is seen at 6 GHz (Fig. 5e) also, however at 7.53 GHz (Fig. 5f), smaller fractals took the key role in current distribution.
This reconfigurability condition of the antenna does not need any change in the antenna dimension or feeding technique or change of material.
International Journal of RF and Microwave Computer-Aided Engineering,28(4), 21216 [37] Liang Wang et al 2020 J.

Tribological and oxidation properties study of a kind of sodium sulfonate-modified nano carbonate sodium He Zhongyi1,2 a,Xiong Liping1b,Xu Huan1,Li Tao2,Qiu Jianwei2,Fu Xisheng2 1)School of Basic Science, East China Jiaotong University, Nanchang, PR China 2)PetroChina Lanzhou Lubricating Oil R & D Institute, Lanzhou, PR China aemail:zhongyihe@yahoo.com.cn; bemail:zhyhe@ecjtu.jx.cn Key words: alkali metal sulfonate; nano carbonate sodium; tribological property; antioxidant Abstract: The tribological properties of a high base value sodium sulfonate-modified nano carbonate sodium as lubricating oil additive were introduced in this paper, and its antioxidant collaboration property with ashless antioxidant was evaluation by using pressure differential scanning calorimetry(PDSC).
To study tribological property of sodium sulfonate which containing nano carbonate sodium applied as extreme pressure additive, and it’s antioxidant synergistic effect with antioxidant T531, alkyl benzene sulfonic acid was used as raw material to obtain high base value sodium sulfonate, and it’s tribological property was evaluated by using a four-ball machine in hydrogenation oil, its antioxidant property with T531(N-phenyl-α-naphthylamine) was also discussed in this paper.
Lubrication engineering, Vol. 164 (2004), p. 92-94 [3] Yan Xue and Junbing Yao. lubricating Oil(In Chinese), Vol. 20 (2005), p. 30-33 [4] Xingguo Fu, Siben Li.
Lubrication Engineering.

Computational Fluid Dynamics Study on the High Temperature Proton Exchange Membrane Fuel Cell Shuguo Qu1, a, Jianlong Li1,b 1 Department of chemical Engineering, Qingdao University of Science & Technology, Qingdao, 266042, Shandong, China ashuguoqu@163.com, bljlong@qust.edu.cn Keywords: Computational fluid dynamics; Nafion/SiO2 composite membrane; high temperature proton exchange membrane fuel cell; mathematical model.
Proton exchange membrane, as an important material for PEMFC, is the decisive factor of the working temperature of the PEMFC system.
They showed that thermal management strongly affected the fuel cell performance and discussed key optimization parameters for performance improvements.
Applied Thermal Engineering, 29(2009)3409–3417 [16] A.