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Introduction Current modelling methods of technical processes are mainly the static material flow analysis (MFA) based on “material flow”.
Definition 2: The tuple is called a Petri net system whose elements are defined as follows: is the base net of the petri net system and is defined as Definition 1 K represents the capacity of P, namely the maximum of tokens in the material place represents the weight on the flow (F) in the net N, represents the weight from the material place to the technique, namely the amount of reactant required by the technique, represents the weight from the technique to the material place, namely the amount of product of the technique represents the initial value of each material place Definition of input and output material: The material in the material place in the Petri net of the metallurgical process is defined as several forms: raw material, semi-finished product, scrap and finished product.
Acknowledgment This research was supported by the National Natural Science Foundation of China under the contract of 51090381 and The national key basic research development program (973 program) under the contract of 2013CB632601 .
Computer Science, (2005) VoL 32No．11 [2] Yuan Chongyi.
Journal of Software, 2006

Material and Methods This test was done in the artificial intelligence anti canopy in the Liaoning Academy of Agricultural Sciences in 2011.
Shi: Journal of Integrative Agriculture,Vol. 11 (2012), p.1026-1037 [2] L.
Sun: Journal of Plant Ecology, Vol. 32(2008), p.477-484
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Also, take the two reasons as tip events and do top-down analysis , it can be found that pipeline leakage is caused by internal and external corrosion and existed defects and pipeline rupture is caused by the third damage , corrosion cracking , incorrect operation , bad material mechanical properties .
When using the limited manpower and material resources to reduce the accidents occurrence , the basic events having greater probability importance degree should be considered firstly .
Science Press,Beijing74-86,2004
:Fuzzy Fault Tree Analysis on Transmission Pipeline Failure Situation,Petroleum Journal,2002,23(2):85-89
:The Fault Tree Analysis Method in Oil&Gas Pipeline,Xi'an Petroleum Journal,2003,18(1):47-50.

The obtained data are significant for development of technologies for electrochemical processing of copper-nickel sulfide materials with extraction of metallic powders and elemental sulfur as separate products.
The work was supported by the Ministry of Education and Science of Russia, project no. 02.740.11.0821.
Bullah, O.A.Khan: Journal of Applied Chemistry Vol. 2 (1954), p. 157
[5] American Society for testing and materials (ASTM): 44-1418, 30-0863, 2-772, 4-850, 17-449, 4-850, 9-205. 5
Vozisov: Journal of Applied Chemistry Vol. 1 (1953), p. 55

Risk from Market Oil, coal and natural gas are the main raw materials of China’s chemical industry.
There is an obvious contradiction between the supply of China’s chemical raw materials and the production of chemicals.
[2] Cao Jingjing, “The Competitive Advantages of Hebei Port Industries,” Science Technology and Industry, Vol10, No12,Dec., 2010(In Chinese)
[3] Zhang Guangxing, Lei Ming, Liang Jie, “Growth of port and inland industries--An empirical survey of the three ports in the east of Hebei”, Journal of Hebei normal university/Philosophy and Social Sciences Edition/ No.4 Jul.2009Vol.32 (In Chinese)
[5] Hu Lin-feng, Xuan Changyong, “Problems and Countermeasures in Port-based Industry Cluster of Lianyungang,” Journal of Lianyungang Technical College,Vol.23 No.2.June.2010(In Chinese).

Modeling and Simulation of the ultrasonic motor which using bending vibration transducer Zili Huang1,a*, Weishan Chen2,b 1Room 426, Building 2F, Science and Technology Park, Harbin Institute of Technology, Harbin, Hei Longjiang Province, China. 2Room 424, Building 2F, Science and Technology Park, Harbin Institute of Technology, Harbin, Hei Longjiang Province, China.
Because of preload force, deformation of friction material is shown in Fig. 3b.
The linear stiffness of driven-foot is , and the linear stiffness of friction material is .
Journal of Nanjing University of Aeronautics & Astronautics. 37(2):144-148, 2005
Journal of Vibration, Measurement & Diagnosis. 20(1):7-12, 2000

The use of these methods in a real survey is almost impossible due to the need to meet sufficiently stringent requirements for surface preparation, which requires time and significant material costs.
Development of methods and equipment for thermographic control, focused on the diagnosis of condition and study of thermophysical characteristics of various materials, is carried out in leading scientific laboratories in the United States and Canada.
Lebedev, “Thermal Nondestructive Testing of Buildings and Builded Constructions”, Russian Journal of Nondestructive Testing, 39 (5): 395-409, Moscow, Russia, 2003
[4] Zhengwei Yang, Xingyu Xie, Yin Li, Gan Tian, “Numerical Analysis of Influencing Factors and Capability for Line Laser Scanning Thermography Nondestructive Testing Technology in Chemicals Corrosion Defect Detection”, IOP Conference Series Materials Science and Engineering, 484 (1): 012026, 2019
Aubreton, “Nondestructive testing based on scanning-from-heating approach: Application to nonthrough defect detection and fiber orientation assessment”, Journal of Electronic Imaging, 24 (6): 061112, 2015

Introduction High charge carrier mobility in graphene [1] makes it a suitable material for high frequency electronic devices.
Acknowledgements This work is supported by the European Science Foundation (ESF) under the EUROCORES program EuroGRAPHENE and European and Swedish Research Councils (VR) as well as the Swedish Government Strategic Research Area Grant in Materials Science.
Novoselov, Nature Materials 6 (2007) 183
Janzen, Journal of Crystal Growth 310 (2008) 4430
Chung, Journal of Crystal Growth 310 (2008) 4126

Functions of Step Gating System in the Lost Foam Casting Process Hong Zhou 1,a, Li Heng Luo2,b 1Department of Materials Engineering, Panzhihua University, Panzhihua, China 2No.28 Primary School of Panzhihua Municipal, Panzhihua, China apzhu_zhouhong@163.com, bpzhu_luoliheng@163.com Keyword: Step gating system, Lost foam casting, Numerical simulation, FLOW-3D Abstract.
This software, FLOW-3D, developed by Flow Science, Inc. in the US, is a commercial code on a computational fluid dynamics (CFD), and it can be modified to include the effects of varying interfacial heat transfer coefficient in LFC.
Liu: Chinese Journal of Mechanical Engineering, Vol. 40 (2004) No.6, p.81.
Overfelt: Journal of Materials Processing Technology, 182 (2007), p.333
(In Chinese) [16] C.W.Hirt and M.R.Barkhudarov: Modeling the Lost Foam Process With Defect Prediction (Flow Science, Inc., U.S. 1997), p.6.

Various materials, such as metals or their compounds, even fullerenes, have been successfully used to fill CNTs employing different methods.
But the structural properties of the encapsulated materials are still not very clear.
Vol. 456 (2000), p. 947 Journal Title and Volume Number (to be inserted by the publisher) [15] H.J.
Di Tolla: Science 291 (2001), p. 288 [18] Y.
Takayanagi: Science Vol. 289 (2000), p. 606 [20] Y.