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The Restriction of Hazardous Substances Directive (RoHS), which took effect on 1 July 2006, restricts the use of six hazardous materials including Pb in the manufacturing of electronics devices.
Thus, the drive to eliminate lead (Pb) from electronics has resulted in the replacement of Pb-free alloys for both surface finish and soldering materials in electronic devices.
However, as the electronics industry migrated toward Pb-free assembly and system, the surface finish materials have been replaced with pure Sn or Sn-based alloys.
Greene, "Microstructural Evolution during Film Growth," Journal Vacuum Science Technology, pp. 117-128, 2003
Li, "Optimum Thickness of Sn Film for Whisker Growth," Journal Electronic Materials, pp. 2069-2075, 2011.

What's more, as for the parallel steel truss component, the smaller the damping of its material is, the larger the vibrating amplitude is.
Journal of hot working process, 2013(7):198-199,203(In Chinese)
Mechanical Science And Technology, 2001,20(7):587-589(In Chinese)
Journal of materials research and applications, 2012, 6 (1): 14-20(In Chinese)
Comparative Study of the vibratory stress relief (VSR) and the thermal stress relief (TSR) of Cylinder wallboard[J].Advanced Materials Research ,Vol. 331 (2011) 460-464.

However, the wet etching processing is not adopted in the plastic materials because the chemical fluid usually damages the plastic substrate.
Laser direct writing can flexibly produce the ITO circuit patterns on the glass and plastic substrate, which the laser beam focuses on the ITO films and ablates the materials to form the ITO circuit patterns.
The overlapping rate is an important parameter in the laser materials processing and depends on the feeding rate and repletion rate of laser.
This research developed a UV laser materials processing system and produces the ITO circuit patterns on the glass substrates which uses the third-harmonic laser to ablate the ITO films.
Mahdavian: Journal of Materials Processing Technology Vol. 146 (2004), p. 188.

[6] Duaa muthana, Alaa Nazar Abd Algaffar, Abdullah Ibrahim Abbo Al-Numan, Design and Evaluation of a Polarizer Filter, Baghdad Science Journal, 2018, (15), 287-291
Journal of the Physical Society of Japan 86.12 (2017): 124721
In EPJ Web of Conferences, EDP Sciences, 162 (2017) 01008
EDP Sciences, 2017
EDP Sciences, 2017

Evaluation on risk of non-point source pollution in Dayanghe watershed based on GIS Anning SUO 1,2 Huaru WANG 3 Yuanbin FU 1,2 1.National Marine Environment Monitoring Center, Dalian,116023; China; 2.Key Laboratory of Sea Field Management Technology, SOA, Dalian, 116023, China; 3.Life Science College, Beijing Normal University,Beijing,100875, China.
Material and methods Study site Dayanghe watershed (122°51′55″～124°07′00″E，39°47′30″～40°49′35″N) is located in the northeast part of China and area is 665205hm2.The terrain is low-lying north to south.
Journal of Soil and Water Conservation, 16(2001):38-39. .
Journal of Environmental Management,48 (1996):263-282
Environmental Science, 27 (2006):2415-2420.

Introduction Ultrasonic motor is a kind of new type driving device in recent years, it can turn high-frequency alternating current into stator’s vibration of ultrasonic motor by the inverse piezoelectric effect of piezoelectric material ,then it alternate current vibration into the rotation or linear motion of ultrasonic motor by the friction between stator and rotor[1].It has more characteristics than electromagnetic motor, such as low speed and high torque, light weight, micro-displacement, no noise, no electromagnetic effect and self-locking power.
Journal of SHANG DONG University (Natural Science Edition), 2002, 30(2), 115-121
Chinese Journal of Electron Devices, 2007, 30(1): 109-112
Mechnical Science an Technology, 2006, 25(5): 603-607.

In the simulation process, because of the type of problem, the real reality method was used, but on its basis a model was developed of the dependence of force on the parameters of the material of a technical object, which can be implemented into a virtual reality.
Design Methods, Tools, and Interaction Techniques for eInclusion, Lecture Notes in Computer Science Volume 8009, 2013, pp 13-20
Molenbroek, R. de Bruin, Anthropometry of a Friendly Rest Room, Assistive Technology: The Official Journal of RESNA. 18/2 (2006) 196-204
Staples, Designing ethnographic encounters for enriched HCI Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 8009 LNCS (PART 1), 2013, pp. 3-12
Work: A Journal of Prevention, Assessment and Rehabilitation, 41 (2012) 1708-1711

Dislocation distribution function of two fracture dynamics problems concerning aluminum alloys Nian-chun Lü1, a, 3,c , Yun-hong Cheng 2,b , Jin Cheng3,c , Yile Chen4,d 1 School of Material Science and Engineering, Shenyang Ligong University, Shenyang 110168, P R China; 2 Department of Civil Engineering, Northeastern University, Shenyang 110006, P R China; 3 School of Astronautics, Harbin Institute of Technology, Harbin 150001, P R China 4 Henan Jiaozuo Mining Machinery Co.
Noordhoff，Leydon. 1977 [11] R.P .Kanwal, D.L.Sharma, Journal of Elasticity, 1976, 6(4). 405-418 [12] Mathematical teaching office of Tongji University, Advanced mathematics (Vol.1), (Advanced Education Press, Beijing, 1994.
Atkinson, International Journal of Engineering Science. 1965, 3 (2): 77-91 [14] I.

Development of Automatic Control System for a Rolling Shear line Qianlai Sun a , Zhiyi Sun b, Xuewen Yan c and Hong LI d School of Electronic Information Engineering, Taiyuan University of Science and Technology, Taiyuan, Shanxi, China a sql_sun@163.com, bsunzhiyi@263.net, c yxw_9@sohu.com, dlihongty@sina.com Keywords: Rolling shear line, Automatic control system, PROFIBUS-DP, Cut to length Abstract.
According to different thickness and material of steel plate waiting for cutting, the clearance between blades of shear must be adjusted frequently.
Acknowledgments This work is supported by Shanxi Province Natural Science Foundation (Granted No. 2009011016-2) and Shanxi Province Scientific and Technological Project (Granted No. 2007031160).
Sun: Chinese Journal of Scientific Instrument, Vol. 26 (2005) No.8, P.790.
Yan: Chinese Journal of Scientific Instrument, Vol. 22 (2001) No.4, P.253.

Acknowledgements This work was financially supported by the National Science and Technology Major Project(2013ZX04002-021）and International Science and Technology Cooptation Project (2011DFR 70350).
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