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adishaw@pme.nthu.edu.tw, bsfaayll@hotmail.com, ce3860931@gmail.com Keywords: Analysis, Hydrodynamic Bearing, Equivalent Oil Film, Porous Material.
The hydrodynamic bearing composed a hydrodynamic bearing made of porous material and several hydrostatic chambers with an external oil system.
Introduction Journal bearings have been used in precision industry for more than half century.
Acknowledgments The authors greatly appreciate the support of the National Science Council (grant number NSC 103-2218-E-007-006), without which this research could not have been completed.
Steiner: Hydrodynamic porous journal bearings: Part 1 – Finite full bearings, J.

Introduction Composite materials have gained a lot of demand in automobile, aerospace, marine industries.
Pawade: Procedia Materials Science vol. 5 (2014), p. 2014-2022
Karunamoorthy: Journal of Materials Processing Technologyvol. 207 (2008) p. 343-349 [5] Al Refaie Abbas, Ming Hsien Li and Kuo Cheng Tai: Journal of University of Science and Technology Beijing: Mineral Metallurgy Materials (Eng Ed) vol. 15 (2008), p.714-722 [6] Setu Dave, Jay J Vora, Nimesh Thakkar, Aditya Singh, Saurabh Srivastava, Bhargav Gadhvi: Key Engineering Materials vol. 706 (2016), p.3-8 [7] Adeel Ikram, Nadeem Ahmad Mufti, Muhammad Qaiser Saleem, Ahmed Raza Khan: Journal of Mechanical Science and Technology vol. 27 (2013), p. 2133-2141 [8] M.
Garg, Ajai Jain, Gian Bhushan: Arabian Journal for Science and Engineering vol. 39 (2014), p. 1465-1476 [9] G.
Hsu: International Journal of Advanced Manufacturing Technology vol. 47 (2010), p.395-402 [12] Yan Cherng Lin, Biing Hwa Yan and Yong Song Chang: Journal of Materials Processing Technology vol. 104 (2000), p. 171-177 [13] Kamal Jangra, Ajai Jain and Sandeep Grover: Journal of Scientific and Industrial Research vol. 69 (2010), p.606-612 [14] Jong Hyuk Jung and Won Tae Kwon: Journal of Mechanical Science and Technology vol. 24 (2010), p.1083-1090 [15] A.

Traditional core materials include honeycomb, foam, etc., among which honeycomb sandwich structure is the most common.
This kind of three-dimensional periodic structure is formed by folding flat materials according to the law.
A variety of materials can be used to prepare foldcore sandwich, such as: thin sheets of paper, metal, thermoplastic materials (PEEK, PET, etc.), Nomex paper, carbon fiber composite materials, aramid fiber composite materials, etc. [10].
There are many types of materials that can be stamped, and there is no requirement for the melting point.
However, this automated process is mainly suitable for metal materials with good ductility.

Australian Journal of Basic and Applied Sciences, 7(8), 812-818
International Journal of Engineering Sciences and Emerging Technologies. 1(2), 118-122
International Journal of Material Science, 3(4), 145-151
International Journal of Molecular Sciences, 13, 7186-7198
Utilization of sludge as brick materials.

The mechanical relations of the materials of the cylinders are described through the harmonic potential.
Mechanics of Composite Materials.
S.: Axisymmetric longitudinal wave propagation in a finite pre-strained compound circular cylinder made from compressible materials.
CMES: Computer Modeling in Engineering and Science.
Journal of Sound and Vibration.

Polymer Materials Science & Engineering, 2017. 33(10): p. 23-28
Soil Science Society of America Journal, 2006. 70(1): p. 215
Journal of Colloid & Interface Science, 2013. 391(2): p. 16-20
Materials Research Bulletin, 2013. 48(5): p. 1811-1816
Journal of Environmental Sciences, 2017. 56(6): p. 12-24

Research Materials and Methodology a) Foundry sand Metal foundries use large amounts of sand in the metal casting process.
The river sand is washed and screened, to eliminate deleterious materials and over size particles.
Replacement of cement by marble dust and ceramic waste in concrete for sustainable development, International Journal of Innovative Science, Engineering and Technology (IJISET), Volume 2, Issue 6, pp. 496-503
Effect of waste ceramic tiles in partial replacement of coarse and fine aggregate of concrete, International Advanced Research Journal in Science Engineering and Technology (IARJSET), Volume 2, Issue 6, pp. 13-16
Studies on strength characteristics on utilization of waste materials as coarse aggregate in concrete, International journal of Engineering Science and Technology (IJEST).

a, b Keywords: tunable Bragg gratings; organic nonlinear optical materials; polymers.
Bhuiyan for materials fabrication.
Measurement Science and Technology, 18(10):3155, 2007
Journal of Materials Chemistry, 14:1321-1330, 2004
Moehlmann, editor, Nonlinear Optical Properties of Organic Materials VII, volume 2285 of Proceedings of SPIE, pages 131-140.

The Institute of Materials Science and Engineering of the University of Kaiserslautern (WKK) has a long-time experience on ultrasonic welding of dissimilar materials, for example different kinds of CFRP, light metals, steels or even glasses and ceramics.
Therefore aircraft-related materials are joined by ultrasonic welding.
Fig. 2: Significant influencing parameters for ultrasonic metal welding [5] Ultrasonic torsion welding of aerospace materials The Institute of Materials Science and Engineering Kaiserslautern (WKK) has a broad experience in ultrasonic welding of dissimilar materials, for example metals to ceramics as well as light metals to carbon fiber reinforced thermoplastic polymers.
Selected properties of the investigated materials are displayed in table 1 and 2.
Eifler, Ultrasonic Welding of Hybrid Joints, Journal of the Minerals, Metals and Materials Society (JOM), 64(3), 401-406, 2012 [8] F.

Ali: Energy Materials and Solar Cells, Vol.93 (2009), p.571-576
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Elias: Energy and Combustion Science, Vol.39(2013), p.285-319
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