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While the transparency of ceramic materials is affected by many factors, such as material thickness, crystal structure and firing number and so on, and ceramic materials have determinate translucency.
Materials and Methods Materials.
Empress II materials were made into samples of 0.8mm thickness.
Each group of samples was made according to the operating manual, and each color group had 3 circle samples (378 Journal of Oral Science Research, Aug. 2005, Vol. 21, No. 4) which diameter was 15 mm.
Acknowledgements This work was supported by the National Natural Science Foundation of China (No.50872152) andBeijing Science and Technology Project (No.

Kapoor: ASME Journal of Manufacturing Science and Engineering Vol. 125 (2003), p.192
Melkote: ASME Journal of Manufacturing Science and Engineering Vol. 128(2006), p.731
Melkote: Materials Science and Engineering Vol. 474(A) (2008), p.283
Liub: Journal of Materials Processing Technology Vol. 195(2008), p.204
Melkote: International Journal of Mechanical Sciences Vol. 49 (2007), p.650.

Laser Processing: Using the interaction of laser beam and material, the metallic or non-metallic materials were processed by drilling, welding, cutting, turning, surface and heat treatment.
Advance of manufacturing process by materials science: Materials science requires more new challenges of manufacturing process, on the one hand, it compels ordinary mechanical processing methods to change the tool material, and improved manufacturing equipment, on the one hand, for the processing of new functional materials, new manufacturing process technology, which requires the application of more physics, chemistry, materials science and modern knowledge.
Acknowledgment The research is supported by International Cooperation Science and Technology Projects of Ministry of Science and Technology (2006DFA72470), Science and Technique Foundation of Henan Province (092102210272).
Journal of Membrane Science, 2002, 204: 271-281
Journal of Biotechnology, 2005, 116:79-89.

Moreover, for the cases with stacking and without stacking materials and filled by CO2 and Xe gases, Figs. 8a and b respectively show the sensitivity curves by using rectangular and hemi-cylindrical chambers.
Fig. 7 Sensitivity curves for the cases of applying the hemi-cylindrical and rectangular chambers with stacking and without stacking materials.
Fig. 8 Sensitivity curves for the cases with stacking and without stacking materials and filled by CO2 and Xe gases.
Yang : Journal of Micromechanics and Microengineering Vol. 11 (2001), p. 504 [17] F.
Nouet: Journal of Electronic Testing Vol. 27 (2011), p. 411 [21] L.C.

Materials.
IOP Conference Series: Materials Science and Engineering. 390. 012075
Materials today: proceedings. (2019)
Journal of Engineering and Applied Sciences, 2013; 12. 102-110
Journal of Composite Materials, 2019; 53(28-30), 4215-4223.

However, due to the high hardness (Mohs 9) and stable chemical properties, sapphire crystal belongs to the category of difficult materials.
[9] B H Lv, J L Yuan, Y X Yao, Z W Wang, Materials Science Form, 532(2006): 460-463
[10] J Y Choi, H D Jeong, International Journal of Machine Tools and Manufacture, 44(2004): 1163-1169
[13] J B Wang, Y W Zhu, J S Wang, J Xu, D W Zuo, Journal of Synthetic Crystals, 2014, 43(2014):1099-1104
[16] Z C Lin, W S Huang, J S Tsai, Journal of Mechanical Science and Technology, 26(2012): 2353-2364

Baluc, Journal of Nuclear Materials 386-388 (2009) 426-429
Journal of Refractory Metals & Hard Materials 27 (2009) 696-700
Schoenung, Materials Science and Engineering A 493 (2008) 207-214
Lavernia, Progress in Materials Science 51 (2006) 1-60
Herrera, Journal of Materials Science 40 (2005) 3911-3915.

Introduction With high thermal conductivity, favorable rigidity and smooth surface finish, the metal materials is generally used as mould material in the fabrication process of polymer matrix composites.
But the burning marks phenomenon couldn’t be found in the core materials with SS binders.
Amol: SAMPE Journal Vol. 43 (2007), p. 24-33 [2] Xs.
Li: Materials and Design Vol 30 (2009), p. 210-213 [9] Wg.
Hu: Journal of Materials Science & Technology Vol. 26 (2010), p. 270-275

The teaching of literature retrieval course is an effective channel to develop innovative ability for agricultural science and technology university students.
It’s limited for “database retrieval”, “document delivery”, “interlibrary loan”, “science and technology novelty search” and “user training such services”；2) search engine is the main way that students get information (35.4%), while “database” is only 12.04% ；3) the current literature graduate students types of use are limited in the "book", "journal" and "dissertation" on, and the use sum of the "conference papers" "patent document", "standard literature “report of science and technology” only accounted for 16.58% .For graduate students in science and engineering， the latter four types of literature apparently haven’t drawn great attention from the students；4) to find learning materials, email and browsing news is the main purpose of the graduate students to use the Internet; 5) 25% of the students know the novelty search, only 5.54% of the students did study sci-tech novelty search.
Jilin agricultural science and technology college student provincial innovation subjects are up to 60 per year and 60 school level ones.
Upload teaching materials to server to realize online sharing, Fundamentally solve the problem that literature retrieval course students’ accessing to information is not convenient.
[2] Mingqiu Yang,Journal of Jilin Teachers Institute of engineering and technology(2008).in Chinese

The Description of Precision Forging Technology in Closed Die of Mg Alloy AZ31 Using Computer Simulation Mária Kapustováa, Jozef Bílikb Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Production Technologies, Slovakia amaria.kapustova@stuba.sk, bjozef.bilik@stuba.sk Keywords: Precision Forging, Closed Die, Magnesium Alloys, Computer Simulation, Material Flow Abstract.
Bohnsak: Closed die technologies for hot forging, in: Journal of Materials Processing Technology, 98 (2000), pp.165-170 [3] M.
Chan et al.: The Influence of Process Parameters on Forged Magnesium Alloys, in: Materials Science Forum, (2003), Vol. 437-438, pp.427-431 [5] P.
Bednarek: Forgeability of MgAlZn magnesium alloys in hot and wrm closed forging, in: Journal of Materials Processing Technology 177 (2006), pp. 210-213
Yong et al.: Evaluation on the Formability of Magnesium Alloy AZ31, in: Materials Science Forum, (2003),Vol.437-438, pp.435- 438 [8] R.