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The pressure grade, temperature grade and material grade of wellhead should adjust to the well condition.
Journal of Southwest Petroleum University (Science & Technology Edition), 2011,33(2):137-141 in Chinese.

., is mainly engaged in materials and water quality.
Table 1 Slope material parameters Ratio of slope （°） wet density γ' (kN/m 3) bulk density γ (kN/m 3) cohesive force c(kpa) Interal friction angel Φ (°) slope height h(m) 29 19.70 17.75 7.5 32 10 Bird Island Park in the west of Shenyang City, river water level is usually maintained at around 5m, calculation model shown in Fig.5, Ⅰ, Ⅱ, Ⅲ, Ⅳ that imposed by the concrete and block force,mesh division and the results shown in Fig.6.
Acknowledgements: The author would like to thank his collaborators from and support of the Ministry of Water Resources nonprofit industry research and special funding projects(200801040) and, a major focus on science and technology plan project of Liaoning Province (2008212001).
Journal of Hohai University( Natural Sciences).Vo1.33 (2005),p.476 (In Chinese)
(Science Press, China 2009).

The mechanism of accidents resulted from cyber-terrorist attacks, which has become a new issue in the field of safety science, differs far from traditional industrial accidents such as fire, explosion and chemicals leakage resulted from systematic failures or human mistakes.
Illegal actions are increasingly open including convening meetings, organizing competitions, preparation of teaching materials and so on.
The risk science can provide a basis for allocating investment to improve homeland security.
Bonnaccorsi: On the Relationship between Firm Size and Export Intensity, Journal of International Business Studies(1992), XXIII (4), p. 605-635

., 2007,“Pellet: A practical OWL-DL reasoner,” Web Semantics: Science, Services and Agents on the World Wide Web, 5(2), pp. 51–53
F., and van Harmelen F., 2003,“From SHIQ and RDF to OWL: The making of a Web Ontology Language,” Web Semantics: Science, Services and Agents on the World Wide Web, 1(1), pp. 7–26
[12] Sprenger A., Haydn M., Ondoua S., Mosch L., and Anderl R., 2011,“Ontology-Based Information Model for the Exchange of Uncertainty in Load Carrying Structures,” Applied Mechanics and Materials, 104
[28] Minervini P., d’Amato C., Fanizzi N., and Tresp V., 2016,“Discovering Similarity and Dissimilarity Relations for Knowledge Propagation in Web Ontologies,” Journal on Data Semantics, 5(4), pp. 229–248.

Materials and methods A.
Acknowledgment The research was supported by China 973 program (2011CB111606), National science and technology support program (2010DAD04B03), Changjiang Scholars and Innovative Research Team in University (PCSIRT0848) and China Agricultural Research System (CARS-43-8).
Sugiura: The Plant Journal Vol. 49 (2007), p. 128-134
Cai: Progress in Natural Science Vol. 18 (2008), p. 1069-1076.

While the kinematic and dynamic properties of the machine tool and the tool geometry influence the surface waviness and form error; the material properties of the tool and workpiece, the vibrations, and the environmental factors such as the coolant influence the surface in the roughness scale.
Campatelli, G, On the generation of chatter marks in peripheral milling: A spectral interpretation, International Journal of Machine Tools and Manufacture. 133 (2018) 31-46
Cheng, Dynamic cutting process modelling and its impact on the generation of surface topography and texture in nano/micro cutting, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture. 223.3 (2009) 247–266
Amidror, Sub-Nyquist artefacts and sampling moiré effects, Royal Society open science. 2.3 (2015), 140550.

Application of Six sigma DMAIC Methodology for reducing defects in a foundry shop Virender Narula , a, Sandeep Grover 2,b 1Associate Professor, Manav Rachna International University Faridabad, India 2Professor, Y M C A University of Science and Technology Faridabad, India avirender.narula@gmail.com(corresponding author), bgroversandeep@hotmail.com, Keywords: Six sigma, define, measure, analyze, improve, control, sand castings Abstract.
Inadequate use of mold washes and mold-facing materials causes penetration.
Mold coatings and facing material tend to prevent metal penetration and sand fusion. 4.
Cause and effects diagram is classified in six categories which are: Measurements, Methods, Machines, Temperatures, Material, People Fig. 2 Cause and effects Diagram 4.
Evans, Successful implementation of six sigma: Bench Marking General Electric company, Bench Marking International Journal 7(4) 2000 260-282

A Practical Approach to FM2 Motion Planner Ander Ansuategui1a, Loreto Susperregi1a, Elena Lazkano2b and Basilio Sierra2b 1Intelligent Systems Unit, Fundación Tekniker, Eibar, Spain 2Dept. of Computer Science and Artificial Intelligence, University of the Basque Country, Donostia, Spain ae-mail: aansuategui@tekniker.es , be-mail: b.sierra@ehu.es Keywords-Robotics; navigation; path planning; fast marching square Abstract.
Blanco, ”Fm2: A realtime sensor-based feedback controller for mobile robots”, International Journal of Robotics and Automation.
Sethian, ”Level Set Methods: An Act of Violence.”, Evolving Interfaces in Geometry, Fluid Mechanics, Computer Vision and Materials Sciences, 1997

The Pacific Jounal of Science and Technology, Vol. 8, no. 1 (2007), p. 68-72
Advanced Materials Research, Vol. 433-440: p. 2509-2512, (2012)
International JouANNl of Advanced Computer Science and Applications, Vol. 2, no. 6 (2011), p. 63-69
European Journal of Operational Research, Vol. 195, no. 3 (2009), p. 914-923

The suitable method can be selected on the basis of materials involved and the forms of sample to be prepared.
Crosslinking renders the liquid materials into mechanically stable films with a storage modulus of 105 Pa at 100°C.
Tarascon, Van W Schalkwijc, Nanostructured materials for advanced energy conversion and storage devices, Nat.
Sohn, Ferroelectric materials as ceramic filler in solid composite polyethylene oxide‐based electrolytes, J.
Sekhon, Relative role of plasticizer and nano size fumed silica on the conductivity behaviour of PEO-NH4PF6 polymer electrolytes, Indian Journal of Engineering and Materials Sciences, 12 (2005) 557-562