关键词：
nonlinear systems;fault diagnosis;differential algebra;characteristic set
摘要：
Differential algebra tools have been applied to study the identifiability of dynamic systems described by polynomial or rational equations, but have hardly ever been considered to check the diagnosability of nonlinear systems. The diagnosability here is given by the algebraic observability of the variable modelling the fault. In this note, the differential polynomials defining dynamical systems are considered as the generators of a differential ideal in a differential ring. The characteristic set of this ideal describes the same solution set of the original system. Its special structure allows to construct the exhaustive summary of the model used to test the diagnosability.
作者机构：
[宋少云] Machine Engineering Department, Wuhan Polytechnic University, Wuhan 430023, China;[李世其] College of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
通讯机构：
Machine Engineering Department, Wuhan Polytechnic University, China
会议名称：
Energy and Environment Technology, 2009. ICEET '09. International Conference on
关键词：
Biomass gasification;palm oil waste;catalyst;hydrogen production
摘要：
The catalytic steam gasification of palm oil wastes for hydrogen-rich gas production was experimentally investigated in a combined fixed bed reactor using the newly developed nano-NiO/??-Al<sub>2</sub>O<sub>3</sub> catalyst. The results indicated that the nano-NiO/??-Al<sub>2</sub>O<sub>3</sub> catalyst had greater activity for the cracking of tar in vapor and of hydrocarbons and a higher hydrogen yield than the calcined dolomite in catalytic steam gasification of palm oil wastes. Meanwhile, a series of experiments have been performed to explore the effects of temperature, steam to biomass ratio (S/B) and biomass particle size on gas composition and gas yield. The experiments demonstrated that temperature was the most important factor in this process, higher temperature contributed to more hydrogen production and gas yield. Compared with biomass catalytic gasification, the introduction of steam improved gas quality and yield, the optimal value of S/B was found to be 1.33 under the present operating condition. It was also shown that a smaller particle was more favorable for gas quality and yield.
摘要：
After analyzing the characteristic of engineering drawing design and experiment education model, new teaching methods of using SolidWorks and ObjectARX are put forward. Using SolidWorks to create 3D objects has to be applied. The reasons for improved teaching quality compared to CAI courseware are investigated. ObjectARX programming is studied using special samples of the safety valve. The quality advantages of using ObjectARX programming in AutoCAD are assumed to result from different teaching strategy and contents. It seems that using these teaching methods are satisfied.
会议名称：
2009 2nd IEEE International Conference on Computer Science and Information Technology(第二届计算机科学与信息技术国际会议 ICCSIT2009)
会议时间：
2009-08-08
会议地点：
北京
会议论文集名称：
2009 2nd IEEE International Conference on Computer Science and Information Technology(第二届计算机科学与信息技术国际会议 ICCSIT2009)论文集
关键词：
streaming media technology;information switching;die designing;experiment education mode
摘要：
This paper reviews experimental results concerning the use of an integrated streaming media technology which is applied on the practice teaching of die designing. The characteristics of the new experiment education model are presented on the basis of the technical advantage and the theoretical foundation of the streaming media technology. Their applications are discussed. The explanation of the fundamental is the technical principles of streaming media, constructivism, the instructional design and the transmission and control. The superiority of technology show more efficiency on compress, integrate, transfer and control the instructional information. The quality advantages of using this programming are assumed to result from different teaching strategy and contents. This paper introduces the streaming media technology and features, and gives useful research results and satisfied teaching methods.
作者机构：
[王继焕] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[刘启觉] School of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
School of Mechanical Engineering, Wuhan Polytechnic University, China
关键词：
data acquisition instrument;embedded system;ARM;Ping-Pang mechanism
摘要：
Based on ARM9 RSIC CPU AT91SAM9260 and WinCE, the wireless data acquisition instrument for amusement ride was designed and developed. According to Ping-Pang mechanism, two buffers are created to save real-time sampling data in turns and the full buffer is saved to SD card between sampling timeslot. When data acquisition instrument begins to sample, the sampling start time is saved to a start time index file, and at the same time a directory coded by sampling start time is created to hold sampling data files. To avoid high bit error rate (BER), the length of data transporting frame is not over 100 bytes. The shell and system commands were used to delete and copy data files at the end of instrument, and the system command was used to merge data files at the end of supervisory controller. The implementations of data file operating were described in detail. The data acquisition instruments were used to collect running data of amusement rides in many amusement parks.
期刊：
2008 INTERNATIONAL SYMPOSIUM ON INFORMATION PROCESSING AND 2008 INTERNATIONAL PACIFIC WORKSHOP ON WEB MINING AND WEB-BASED APPLICATION,2008年:373-378
摘要：
The microstructures of sesame cake under five applied pressures were measured using stereo light microscope and Image-pro software. Fractal dimensions of pore section border and pore size distribution were measured and calculated by the slit island process. Regression method was used to analyse the correlation between the fractal dimension and applied pressure. Results showed that the fractal characteristic of pore structure of sesame cake was obvious, the pore structure and its fractal dimension were significantly affected by applied pressure. There existed good linear correlations between applied pressure and fractal dimensions of the pore section border and pore size distribution. Their fractal dimension values decreased significantly with increasing applied pressure. It was concluded that with increasing applied pressure the pore section border is further twisty, the pore wall further rough, the pore shape further irregular and the pore size distribution further complicated.
