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There are many types of defects according to 3*3 QFN products such as a chipped part, foreign material, out on lead bleed, out of package mark, incomplete mold, scratch and contamination.
Acknowledgements The authors would like to thanks the studying company for materials and equipment resources in this research.
Vutikorn: Six Sigma Quality Enhancement of Motors through a Vibration Measurement System, KMUTT Research & Development Journal, Vol. 3 (2001), p.247-267
Devore, in: Probability and Statistics for Engineering and Sciences, 8th ed.
Applied Mechanics and Materials.

The system features material handling and welding using an integrated multi-functional tool.
Acknowledgement This work was supported by the Defence Materials Technology Centre (DMTC), which was established and is supported by the Australian Government’s Defence Future Capability Technology Centre (DFCTC) initiative.
References [1] M Heidelind and M Jackson:,How to improve the use of industrial robots in lean manufacturing systems Journal of manufac.
Computer Science Dept., Iowa State University (1998)
Larkin, Automated assembly of ship panels using an integrated robotic tool, Advanced Materials Research, Vol. 338, pp 639-644, (2011)

First of all, the gasoline was cut into the light fractions and the heavy one, the light fractions as the reaction material reacted with alcohol to produce alkyl ether, then mixed with heavy fractions and obtained etherified gasoline[2].
Experimental Experimental Materials.
The following materials were used for the preparation of catalyst: macropore pseudo-boehmite, Hβ, sesbania powder and nitric acid.
(In Chinese) [8] Tingfang Hu, Jinpeng Chen, Haiyan Wang: Petroleum Science and Technology Vol.24(2006), p. 1477-1484.
Shinichi: Journal of Catalysis Vol. 166(1997), p. 263-271

., Zhengzhou Institute of Aeronautics, Zhengzhou 450015, China 2 School of Material Science and Eng., Beijing University of Technology, Beijing 100022, China a e-mail: newroom@zzia.edu.cn, b e-mail: jwen912@zzia.edu.cn, c e-mail: jwu211@126.com Keywords: Short flow; Granulated metal; Casting; Drip nozzle Abstract.
It is high cost to any parallel materials with good corrosion resistance and mechanical properties, and can not be widely used difficultly.
The process maturity can produce qualified products, but the main problems include: Process complexity and more manufacturing processes; Metal particles collection is low, less than 78%; High energy consumption, 22% of the leftover materials need to return to re-melt scraps, more than 22% more energy consumption; Stamping equipment is huge, strong repair capacity, low labor productivity; High capital investment of equipment; There is contamination of the finished metal particles.
Chinese Journal of Nonferrous Metals, 2004, 14 (2): 204-209

Using the Mohr-Coulomb elastoplastic model as the constitutive model of the material.
Rock and soil parameters of numerical test model are shown in Table 1, supporting materials and parameters of the tunnel model are shown in table 2.
Table 1 Parameters of each layer of model Parameters Soil layer Rock stratum Density（kg/m3） 1800 2380 bulk modulus（Gpa） 0.125 2.52 Shear modulus（Gpa） 0.0577 2.22 Poisson's ratio 0.3 0.16 Cohesion（Mpa） 0.038 1.2 Angle of internal friction（˚） 24 45 Table 2 The supporting materials and parameters The lining type II-III The type of surrounding rock II-III Initial support Local Φ25 hollow grouting anchor L = 3.0m, wet spraying C25 arch concrete thick 80mm Secondary lining C35 waterproof reinforced concrete S10 thick 400mm Comparative analysis of ground surface settlement process induced by two kinds of excavation construction method Process simulate of surface subsidence caused by step method According to first section ground surface settlement induced by excavation process of step method is as follows: (a) The step excavation （b）Figure 8 lower left excavation （c）Figure 9 lower right excavation to 80m
Acknowledgements This work was financially supported by the National Natural Science Foundation (51174124).
Chinese Journal of underground space and Engineering, 2012, 8（5）: 939-944 [2] Wang Mengshu.

If dimensions, material parameters and characteristic values for heat transfer are known structure-based thermal finite-element models can be derived for a machine tool.
The radiated power emitted by the object depends not only on the surface temperature TObj but also on the material and surface properties.
Τransmittance τ is practically zero for relevant metallic materials.
Acknowledgements This research was funded by the German Science Foundation (DFG) within the CRC 96 “Thermo-Energetic Design of machine tools” project C06.
Luhmann, Close range photogrammetry for industrial applications, ISPRS Journal of Photogrammetry and Remote Sensing 65 (2010) 558-569

Two-Dimensional AC Magnetic Properties of Electrical Steel Sheet with Two-Dimensional DC-Biased Magnetization Hideaki Miyahara1,a and Kyyoul Yun1,b* 1Department of Energy Engineering, Graduate School of Natural Science and Technology, Gifu University, Yanagito, Gifu 501-1193, Japan ax4526086@edu.gifu-u.ac.jp, byun7110@gifu-u.ac.jp Keywords: electrical steel sheet, magnetic properties, DC-biased magnetization, two-dimensional magnetic measurement method.
The performance of motors and transformers is greatly affected by the magnetic properties of electrical steel sheets widely used as core materials, so it is necessary to select the optimum material according to the motor driving conditions.
Kaido, Best Selection of Motor Core Materials for Reduction of Motor Core Losses, The Papers of Technical Meeting on Rotating Machinery, IEE Japan, RM-99-126, 1999
Yun, Two-Dimensional AC Magnetic Properties of Electrical Steel Sheet under Two-Dimensional DC-Biased Magnetization, Journal of the Japan Society of Applied Electromagnetics, Vol.26, No.3, 2018

Introduction Welding is a highly complex metallurgical process and, therefore, weldments are susceptible to material discontinuities, flaws and residual stresses.
The welding structure and material properties The butt weld specimens (300mm×300mm×12mm) were applied in this paper, geometry made of 304L.
Fig.1 Welded joint Fig. 2 Weld structure (mm) 304L stainless steel is typical material of chemical equipment.
Chen, etc, Impact indentation method to measure residual stress, Journal of Shenyang Jianzhu University (Natural Science), 17(3) (2007) 200-202.
Barsoum, Influence of thermo-mechanical material properties of different steel grades on welding residual stresses and angular distortion, Mater.Des. 65 (2015) 878-889

Performance analysis of microbial fuel cells with different exoelectrogens at low temperature Olga Tkach1,a, Lihong Liu1,2 b, Aijie Wang1,3,c, Xu Zhou1,d, Duu-Jong Lee1,4,e 1School of Municipal and Environmental Engineering, State Key Laboratory of Urban Water Resources and Environments, Harbin Institute of Technology, Harbin150090, China; 2School of Earth Sciences, Northeast Petroleum University, Daqing 163318, China; 3Key Laboratory of Environmental Biotechnology, Research Center for EcoEnvironmental  Sciences, Chinese Academy of Sciences, China; 4Department of chemical engineering, National Taiwan University, Taipei, Taiwan.
Material and Methods Microbial fuel cell construction and operation.
Science 2007; 315: 808-810
International Journal of Hydrogen Energy 2006; 31:1496–1503
[6] Logan B., Cheng S., WatsonV., Estadt G., Environmental Science & Technology 41 (2007) 3341

Introduction Soil is important natural resources to the survival of humans and also the main place for the material cycle and energy exchange in the ecosystem.
[3] Zhang Z.Y, Diagnosis of Soil Degradation in Mining Wasteland,Kunming: Kunming University of Science and Technology.2008:2
[4] Lin S, Study of Technology on Remediation of Soils Contaminated by Heavy Metals,Science & Technology Information.2013(4)
[5] Zhou M, Wang A.Q, Heavy metals pollution in soils and prevention measures,Science & Technology Information.2006(4)
[8] Zhang Z.Q, Bao M, Chen J.B, et.al, Research on Mechanisms of Heavy Metal tolerance in Plants,Gansu Science and Technology. 2013(3)