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Errors in Observation Height Difference According to the real measurement materials of about 20 measured areas with different geographical conditions, the accuracy of the trigonometric leveling with different side length is statistically calculated, and thus the following empirical formula is concluded
Fujian Construction Science & Technology, 2007-6: 38
Science and Technology Information, 2006-06: 60-62
Journal of Guangxi University (Natural Science Edition), 2006-1: 6-7
Inner Mongolia Science Technology and Economy, 2008-18: 127

Liu2,f 1 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China 2 Inner Mongolia Xingchangjiang investment corporation of mining, Ordos014300, China azhmhxf@126.com, bycwu@hfut.edu.cn (*corresponding author), cxmhuang808@163.com, dshuxia318@163.com, e290983@sina.com, fqmcs2007@126.com Keywords: porous anodic alumina; Etch tunnel; Aluminum electrolytic capacitors; Electrode aluminum foils Abstract.
Corrosion Science, 50(2008), pp. 1576-1583
Analytical Science, 17(2001), pp. a73-a76
Science, 268 (1995), pp. 1466-1468
The Chinese Journal of Nonferrous Metals, 14 (2004), pp.1627-1631.

The most preferable materials are aluminium and stainless steels.
Cebon: Materials engineering, science, processing and design, (2nd Edition published by Butterworth-Heinmann an imprint of Elsevier, 2007)
Evans: The out-of-plane compressive behaviour of metallic honeycombs, Materials Science and Engineering A380 (2004) p. 272-280 [5] J.
Mazumder: Laser aided direct metal deposition of Inconel 625 superalloy: Microstructural evolution and thermal stability, Materials Science and Engineering A 509 (2009) p. 98–104 [7] K.J.R.
Molinari: True and apparent Young’s modulus in ferrous porous alloys, Materials Science and Engineering A260 (1999) p. 197–202

Essentially the development of the LED optical power is the progress of its underlay, materials and fluorescent stuff, so that the scientific workers have kept seeking for the crystal material with top transparency, high-temperature resistance and best crystal-plane orientation as the epitaxial grow surface of the LED optical power, fortunately it is found that taking the alumina sapphire as the substrate can completely meet the needs of the LED optical power.
Anyway, the above mentioned methods probably lead to some problems such as: difficulty to control the purity, top cost for manufacturing the high-purity alumina of over 99.999% because of more reaction materials, complicated intermediate, long technical process and unstable technical process.
Compared with the traditional methods, the distinguished advantages of the way are of low cost, simple techniques, easily controlling the purity and no pollution, especial for the preparation of over 99.999% high-purity synthetic crystal raw materials.
Li: View on high technology and new materials.
Fegley, et al.: Journal of American Ceramic Society (1984), p.

Čadek: Creep in Metallic Materials (Academia, Prague 1988)
Krejčí: In Materials for Advanced Power Engineering, Part I (eds D.
Kloc: In Materials for Advanced Power Engineering 1998, Part I (eds J.
Vöhringer: Advanced Engineering Materials Vol. 5 (2003), p. 490
Li: Canadian Journal of Physics Vol. 45 (1967), p. 493.

Materials and Methodology The spray pyrolysis technique is basically a chemical deposition technique in which solutions of the desired material are sprayed onto a preheated substrate.
Results and discussion: II-VI Chalcogenide semiconductor materials show the structural duality and can be formed as either sphalerite (cubic) or wurtzite (hexagonal) type [16].
Gaewdang: Materials letters, Vol. 59 (2005), p.3577 [4] J.
Dixit: Optical Materials, Vol. 27 (2004) p.261 [7] T.
Bedir: Pakistan Journal of Applied Sciences, Vol. 1, (2001) p.534-537 [16] M.

It is necessary to configure properties of material.
The material of a milling tool is YS2T.
Sodhi: International Journal of Production Research Vol. 47 (2009) No.7, p. 1835-1855 [2] J.H.
Yao: Applied Mechanics and Materials, Vols. 16-19 (2009) p. 399-403 [6] J.
Zhang: Advanced Materials Research Vols. 139-141 (2010), p. 1178-1183

Lee 2 1 Materials Evaluation Group, Korea Institute of Machinery and Materials 66 Sangnam-dong, Changwon, Kyungnam 641-010, South Korea 2 Department of Materials Science and Engineering, KAIST 373-1 Kusong-dong, Yusong-Gu, Daejon 305-701, South Korea Keywords: critical strain, dynamic recrystallization, Ni-Fe base superalloy, Alloy 718, one parameter approach Abstract.
Dunne et al [3] also applied one-parameter approach in studying the effects of second phase on the critical strain for DRX initiation based on finite element deformation calculation of two-phase materials.
Experimental procedure The material used in this study was the Ni-Fe-based Alloy 718 of 5.4 wt.% Nb+Ta.
Journal Title and Volume Number (to be inserted by the publisher) 3 Fig. 2.
Lee: Metals & Materials Int., Vol. 9 (2003) p.15 [8] E.E.

Introduction Basic fracture mechanics theories have been available since several decades, but most of them were only applicable to homogeneous brittle materials (e.g. glass) or to homogeneous brittle-ductile materials (metals).
Chudnovsky, Correlation between Crack Tortuosity and Fracture Toughness in Cementitious Material.
International Journal of Fracture Vol. 60 (1993), pp. 97-105
Materials and Structures Vol. 23 (1991), pp. 457-460
E399-90: Standard Test Method for Plain-Strain Fracture Toughness of Metallic Materials

The result is identical with linear elastic fracture mechanics of brittle materials and the compressive strength is 1120 MPa and the elastic modulus is .
Material of tool tip and uncut material are both affected.
It can be observed from Fig. 2(c) that there are many micro-cracks accumulating and several long macro-cracks propagating into the front material and material interior.
Acknowledgement This work is supported by the Natural Science Fund of Hebei (E2012202112& E2012202088), the Doctoral Fund of the Education Ministry of China (20091317120001) and the Scientific Research Fund of Education Board of Hebei (QN20131158).
[4] Muhammad Arif, Mustafizur Rahman, Wong Yoke San, Ultraprecision ductile mode machining of glass by micromilling process, Journal of Manufacturing Processes, 13 (2011) pp. 50–59