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浏览/检索结果: 共8条，第1-8条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Human factors analysis of major coal mine accidents in China based on the HFACS-CM model and AHP method 期刊论文 INTERNATIONAL JOURNAL OF INDUSTRIAL ERGONOMICS, 2018, 卷号: 68, 页码: 270-279 作者:  Liu, Rulin;  Cheng, Weimin;  Yu, Yanbin;  Xu, Qingfeng 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/11 Coal mine human factors analysis and classification system  Analytic  hierarchy process  Chi square test  Weight calculation  Human factor  analysis   Research on the torque characteristic of disc micromotor on axial magnetic field (EI CONFERENCE) 会议论文 2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China Liu B. 收藏  |  浏览/下载：47/0  |  提交时间：2013/03/25 In order to increase the electromagnetic torque density of micromotor with axial magnetic field  numerical analysis of permanent magnetic field and electromagnetic torque were deduced and the key factors of increasing torque density of micromotor was obtained. The numerical analysis of three-dimensional magnetic field in air gap produced by spliced sector permanent magnetic poles is done  and the way of improving flux density and permanent magnet use efficiency are given through investigating the influence of magnet thickness  height of air gap and pole interval rate and other parameters to air gap flux density and leakage flux. Based on the test of axial magnetic field and torque characteristic of micromotor  the analysis of micromotor magnetic field and calculation of torque are verified  meanwhile using the plane stator with 0.7mm thickness assemble micromotor having minimum air gap height of 1mm and its torque constant up to 3.8mNm/A. 2012 IEEE.   Analysis on the influence of random vibration on MEMS gyro precision and error compensation (EI CONFERENCE) 会议论文 2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China Hao X.; Li M.; Han X.; Jia H. 收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25 In order to improve its precision in dynamic environment  a Kalman filter was designed. Firstly  two sets of random drift data of MEMS gyro were respectively analysed  and it was found that the variance of random drift under random vibration significantly increased and its mean also changed. Then calculation results show that attitude angle error under random vibration is 2.6  while in the static test it is 0.25. Analysis on the characteristics of random drift was carried out  and it is found that it can be treated as stable  normally distributed random signal. Finally  a corresponding Kalman filter was designed. The results indicated that after filtering the variance of random drift is reduced to 0.0282  26.4% of pre-filtering and the attitude angle error is reduced to 1.5  57.7% of pre-filtering. The above method can effectively compensate for the attitude angle error of MEMS gyro caused by random vibration. This study can be a reference to the application of low-cost MEMS gyro in aircraft navigation. (2012) Trans Tech Publications  Switzerland.   Analysis of sinking mechanism and finite element for static pile in collapsed loess region 会议论文 Xiamen, China, March 27, 2012 - March 29, 2012 作者:  Tian, Zhi-Hui;  Wang, Yao-Jun;  Huang, Xue-Feng 收藏  |  浏览/下载：0/0  |  提交时间：2020/11/15 Finite element method  Soils  Analysis and design  Analytical solutions  Calculation models  Cavity expansion theory  Collapsed loess  Elastic-Plastic  Engineering practices  External loads  Finite Element  Finite element calculations  Finite element models  Large deformations  Limit Load  Limited load  Pile-soil  Surrounding soils  Test  Theoretical basis   离心泵叶片两相流边界层分离点移动控制 期刊论文 2010, 2010 王亮申; 于京诺; 曲衍国; 顾九春; 朱玉才; 张永利; 吴玉林; WANG Liangshen; YU Jingnuo; QU Yanguo; GU Jiuchun; ZHU Yucai; ZHANG Yongli; WU Yulin 收藏  |  浏览/下载：2/0 Nonlinear analysis method for predicting optical surface deformations resulted from assembly process (EI CONFERENCE) 会议论文 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China Dong W.; Yong Y.; Guang J. 收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25 There are three main nonlinear elements in the large mirror assemblies  which are screw pretension  adhesive stress and state changes in the assembly process. The optical shape will be influenced seriously by these factors. But the impacts will not be shown in linear analysis results  because as the simplification  these factors have been ignored. The nonlinear analysis method for predicting optical surface deformations resulted from assembly process is discussed in detail. Take a typical mirror support structure for example  the nonlinear analysis model was established. Comparing the calculation results with the optical shape test  it is illustrated that nonlinear analysis is more accurate and closer to the test result. And according to the simulation result  the bowl-shaped depression which was discovered in the test can also be explained reasonably. 2010 Copyright SPIE - The International Society for Optical Engineering.   The performance test and the application of CCD (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Imaging Detectors and Applications, June 17, 2009 - June 19, 2009, Beijing, China Wang S.-R.; Yang X.-H.; Li F.-T.; Zhang Z.-D.; Qu Y. 收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25 The e2v technologies' CCD sensor CCD57-10  which will be used as a detector in the Limb UV Imaging Spectrometer  is tested at first. Then the spectral responsivity calibration of the whole Imaging Spectrometer simply is described. The error analysis and the correction of the test of CCD's parameters under good repeatability and stability indicate that the properties of the CCD are suitable to the Limb UV Imaging Spectrometer. The spectral responsivity calibration and the theoretical calculation of the whole Imaging Spectrometer are within an acceptable error level. 2009 SPIE.   Study on color difference estimation method of medicine biochemical analysis (EI CONFERENCE) 会议论文 ICO20: Illumination, Radiation, and Color Technologies, August 21, 2005 - August 26, 2005, Changchun, China Wang C.; Zhou Y.; Zhao H.; Sun J.; Zhou F. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 The biochemical analysis in medicine is an important inspection and diagnosis method in hospital clinic. The biochemical analysis of urine is one important item. The Urine test paper shows corresponding color with different detection project or different illness degree. The color difference between the standard threshold and the test paper color of urine can be used to judge the illness degree  therefore  it can be used in hospital  so that further analysis and diagnosis to urine is gotten. The color is a three-dimensional physical variable concerning psychology  the estimation method of color difference in urine test can have better precision and facility than the conventional test method with one-dimensional reflectance  calibrating organization and family  while reflectance is one-dimensional variable  it can make an accurate diagnose. The digital camera is easy to take an image of urine test paper and is used to carry out the urine biochemical analysis conveniently. On the experiment  so its application prospect is extensive.  the color image of urine test paper is taken by popular color digital camera and saved in the computer which installs a simple color space conversion (RGB &rarr XYZ &rarr L*a*b*) and the calculation software. Test sample is graded according to intelligent detection of quantitative color. The images taken every time were saved in computer  and the whole illness process will be monitored. This method can also use in other medicine biochemical analyses that have relation with color. Experiment result shows that this test method is quick and accurate