Search results

Analysis and Simulation of a Limited-Angle Torque Motor Yu Zheyan1,a, Wang Ziqiang1,b 1 School of Automation Science and Electrical Engineering, Beihang University, Beijing,100191, China awonderfullife29@126.com, bbhwzq7465@sina.com Keywords: limited angle, torque motor, performance characteristic, finite element analysis Abstract.
According to the magnetization curve for the core material, the core becomes saturated as the flux density is up to 1.8T.
Eq. 8 shows that the stiffness is the key factor affecting the magnitude of the magnetic restoring torque.

Simulation Studies on Transformation of Mercury during Combustion process Jianyi Lu 1, a, Jie Gao 1,b and Chenglong Meng 1,c 1 School of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, Hebei, P.R.China alujianyi@tsinghua.org.cn, b348206427@qq.com, c294672706@qq.com Keywords: Simulation；mercury ；transformation；combustion Abstract: Mercury is one of important trace heavy metal elements and about 1/3 of mercury in the air comes from emissions of coal-fired flue gas.
Studying Methods Chemkin Simulation In this experiment the volume of material composition and the inlet gas flow in the process of mercury combustion are known and the PSR model which is widely used in the simulation of chemical burnings is adopted to calculate.
In the reacting process , the Hg-Cl keys distance gradually reduced, Cl-Cl bond breaks then Hg-Cl bond forms.The reacting process is shown as figure 2.

Synthesis and Characterization of polyimides derived from 5-amino-2(p-aminophenyl) benzoxazole monomer Xiangli Meng12, a, Peng Wang1,b Ling Jiang2 1 Municipal and Environmental Engineering Institute, Harbin Institute of Technology, Harbin 150090, P.
Experimental Material and measurements. 5-amino-2(p-aminophenyl) benzoxazole was prepared from 2,4-diaminophenol dihydrochloride (DADH) and p-aminobenzoic acid(PA) in polyphosphoric acid (PPA) solution under a nitrogen atmosphere[10].
Key structural features of the polyimides were verified by FTIR spectroscopy.

A Novel Bandpass Filter Using Asymmetric Open Stub-loaded SIRs Guogao Liu1,2,a,Li Tian1,b 1College of Computer and Information, Hohai University, China 2Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, China alguogao@sohu.com, btianliwenxin@163.com Keywords: Bandpass filter, stepped impedance resonators (SIRs), asymmetric open stub-loaded, harmonics suppression, compact size.
(b) Equivalent circuit (c) Coupling structure Fig.4 The bandpass filter based on asymmetric open stub-loaded SIRs The coupling coefficients (Mi,j) of the proposed filter can be obtained from the two resonant modes by using electrical engineering simulation
The filter material is the same as the above design.

Material and Methods Literature Collection The search of Chinese literature The data of Chinese literature was from the full text of the Chinese Academic Journal database.
Tab.2 Major English journals publishing wetland science papers written by Chinese researchers (1957–2009) Order Journal Number of publications Percentage (%) Impact factor(2008) 1 Wetlands 248 7.74% 1.117 2 Ecological Engineering 81 2.53% 1.836 3 Journal of Environmental Quality 60 1.87% 2.145 4 Hydrobiologia 50 1.56% 1.449 5 Water Research 41 1.28% 3.587 6 Aquatic Botany 37 1.15% 1.129 The author distribution of the wetlands scientific literature During 7,788 Chinese and English literature published by Chinese researchers, there was totally 6,121 first authors published paper, accounted for 78.6% of the total number of all the literature, this close to Lotka's inverse-square law, author who published one paper account for 60% of total calculated value of all author [8], it indicate that the author distribution of wetland scientific literature normal exist discrete description.
Acknowledgements This study is supported by the National Key Technology R&D Program (No. 2011BAC02B03) and the National Natural Science Funds, PR China (No.31060076).

Pavement Performance Research on Fine Volcanic Ash Modified Asphalt Mastic and Mixture Zhiguo Chen1, a, Zining Chen2,b, Jiantao Wu1,c and Haichen Yao3,d 1Jilin Provincial Communications Scientific Research Institute, Changchun, Jilin, 130012, China 2School of Transportation Science & Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150090, China 3Jilin Communications Polytechnic, Changchun, Jilin, 130012, China ajcczg@vip.sina.com, bchenzininghit@163.com,cwujiantao.hit@163.com, dhaicheny@163.com Key words: Volcanic ash, Compositly modified asphalt mastics, Modified asphalt mixtures, Pavement performance, Cost-effective analysis.
Volcanic ash is a natural building material, with abundant resources in China, mining convenience and low cost.It has tremendous social and economic benefits to apply fine volcanic ash to asphalt modification, improve asphalt pavement performance, reduce road disease, and cut down construction costs as well.

Digital PID Controller Design of Electromagnetic Suspension (EMS) System SUEBSOMRAN Anan Faculty of Technical Education, Department of Teacher Training in Mechanical Engineering, King Mongkut’s University of Technology North Bangkok,1518 Pibulsongkram Rd., Bangsue, Bangkok Thailand email asr@kmutnb.ac.th Keywords: Electromagnetic suspension (EMS) system, Digital PID control, Nonlinear system, Linearization Abstract.
Control of electromagnetic suspension (EMS) system is a key technology and difficulty of a whole system due to its nonlinearity, instability, and uncertainty of system.
Iron core material uses moving magnet coil.

Application of Wavelet Analysis to Eddy Current Testing for the Surface Fatigue Crack of Bolt Holes Xiao-Li LI 1,a , Jin-Li SUN 1,b 1 Naval Aeronautical Engineering Institute Qingdao branch campus, Qingdao 266041, P.R. of China aqdlixl@163.com, b hjsjL@163.com Keywords: nondestructive testing, eddy testing, wavelet analysis, denoise Abstract.
Introduction Eddy current testing (ET) is an effective method for detecting conductive material surface and near surface defect.
At present, the eddy current detection in pressure vessel of nuclear power station, heat exchange tube, aircraft structure and other key equipment defect detection has been widely used[1].

Production Characteristics Study of Tight Gas Reservoir with Network Fracturing Using Numerical Simulation Guangfeng Liu1, a, Rong Hou1, b, Shusheng Li2, c, Yan Gao1, d, Juntao Wang2, e and Xuejiao Li3, f 1 CMOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing, China 2 Petrochina Changqing Oilfield, Xi’an, China 3 Beijing Polydoctor Petroleum Technology Co., LTD, Beijing, China algf@cup.edu.cn, bhourongrr@163.com, clss_cq@petrochina.com.cn, dgykind@163.com, ewangjuntao_cq@petrochina.com.cn, flijunjiao-11@163.com Keywords: Production characteristics, Network fracturing, Tight gas reservoir, Numerical simulation.
Introduction Network fracturing is the technology which crushes rocks in order to form complex fracture networks using low viscosity fluid with high pump rate, large fluid volume and diverting technology or material [1,2].

Welding Operation Technique of Welding Electrode Arc Welding Overhead Welding Test Board Xinghui Li1,a* 1School of Mechanical Engineering, Jiangsu Prvince Xuzhou Technician Institute Xuzhou, Jiangsu, China aemail: 2804809396@qq.com Keywords: electrode arc welding; test plate for overhead welding; operation technique Abstract: Welding electrode arc welding, upside welding, single side welding, double side forming welding operation technology is the most difficult welding process in manual arc welding operation.
The material of the test board is Q235B, and the specification is 100 mm × 12 mm × 300 mm.
For the whole test plate, the welding of the bottom layer is the key.