QQ客服 官方微博 反馈留言

浏览/检索结果: 共9条，第1-9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 Friction Torque and Heat Input Characteristics During Continuous Drive Friction Welding of Aluminum to Steel 期刊论文 Jixie Gongcheng Xuebao/Journal of Mechanical Engineering, 2018, 卷号: 54, 期号: 2, 页码: 110-116 作者:  Zhang, Changqing;  Liu, Xiongbo;  Lü, Guangming;  Rui, Zhiyuan;  Li, Jinglong 收藏  |  浏览/下载：12/0  |  提交时间：2020/11/14 Aluminum alloys  Aluminum coated steel  Forging  Friction welding  Rotation  Torque  Effects of rotation  Forging pressures  Friction resistance  Friction torque  Friction torque curve  Heat input  Quasi-steady state  Rotation speed   Unsteady analysis of effect on hydraulic turbine under variable gas content 期刊论文 Hangkong Dongli Xuebao/Journal of Aerospace Power, 2017, 卷号: 32, 期号: 9, 页码: 2265-2272 作者:  Shi, Fengxia;  Yang, Junhu;  Wang, Xiaohui 收藏  |  浏览/下载：9/0  |  提交时间：2020/11/14 Computational fluid dynamics  Flow measurement  Hydraulic motors  Hydraulic turbines  Impellers  Pressure effects  CFD technologies  Distribution of gas  Gas content  Pressure fluctuation  Rotation frequencies  Two phase  Unsteady  Unsteady analysis   Advances in relativistic molecular quantum mechanics 期刊论文 physics reports review section of physics letters, 2014 Liu, Wenjian 收藏  |  浏览/下载：7/0  |  提交时间：2015/11/10 Quantum electrodynamics  Virtual pair effects  Electron self-energy  Electron vacuum polarization  Charge conjugation symmetry  Charge-conjugated contraction  No-pair approximation  Relativistic Hamiltonians  Quasi-four-component  Exact two-component  Relativistic wave functions  Relativistic coalescence conditions  Relativistic explicit correlations  Relativistic theory of nuclear magnetic resonance  Relativistic theory of nuclear spin-rotation  DENSITY-FUNCTIONAL THEORY  COMPLEX-COORDINATE ROTATION  CORRELATED WAVE-FUNCTIONS  MEAN-FIELD APPROXIMATION  ELECTRON-POSITRON FIELD  NMR CHEMICAL-SHIFTS  CLOSED-SHELL ATOMS  BASIS-SET  NONRELATIVISTIC METHODS  DIRAC-EQUATION   Soft magnetic properties of amorphous-CoZr/polycrystalline-M (M = Cu, Ag, Al, Cr) multilayers 期刊论文 2010, 2010 Li, X.W.; Song, C.; Zong, R.L.; Zeng, F.; Yang, J.; Wen, S.P.; Pan, F. 收藏  |  浏览/下载：126/0 Effects of excitation voltage on comb-finger accelerometer system 期刊论文 2010, 2010 Li Jiang; Dong Jingxin; Gao Zhongyu 收藏  |  浏览/下载：4/0 The linear accelerating superluminal motion model 期刊论文 2010, 2010 Zhou, J.F.; Zheng, C.; Li, T.P.; Su, Y.; Venturi, T. 收藏  |  浏览/下载：5/0 Spectroscopy and dynamics of molecular excited states 期刊论文 2010, 2010 Mo Yu-Xiang; Yang Jie; Li Li 收藏  |  浏览/下载：3/0 Modulation transfer function in seeker camera limits resulting from missile flutter caused by aerodynamic force (EI CONFERENCE) 会议论文 2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China Ai X.; Zhang X.; Jiang Z.; Wei Q.; Jia H. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 The imaging quality of seeker in flight mode has been evaluated through analyzing the effects of missile flutter on optical modulation transfer function (MTF) of the optical system. Firstly the data of transverse vibration has been processed to eliminate the trend term caused by the trajectory  then obtained the displacement with two times trapezoidal integration. For the side rotation  the high frequency noise interference in the data has been filtered by using five-point moving average method. Took this model as the quivering rule between the object and the image  and then analyzed the effects of the transverse vibration and the side rotation on imaging quality through MTF. By calculation  the r.m.s value of the image motion caused by missile transverse vibration is 0.026mm  and the side rotation angle is 0.0044 . Through the establishment of two modulation transfer functions (MTF) of image random vibration and linear vibration  the results show that the image quality had declined  and the effect of transverse vibration on image quality is obvious. Through improving the rigidity of the missile and selection of small focal length optical system and shorten the time of exposure can improve the imaging quality of the seeker. 2010 IEEE.   Orientation error analysis of alt-alt photoelectric telescope (EI CONFERENCE) 会议论文 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 19, 2008 - November 21, 2008, Chengdu, China Han X.-B.; Zhang J.-X.; Zhao J.-Y.; Zhao Y.-Z.; Wu X.-X.; Wang Z.-C. 收藏  |  浏览/下载：26/0  |  提交时间：2013/03/25 In order to ascertain the effects of main errors of alt-alt photoelectric telescope on measurement accuracy  orientation error is analyzed.For analyzing optical  mechanical and electrical errors from measured target to telescope picture  we construct 7 coordinates such as:the earth's core coordinate  alt-alt coordinate  etc.  carry through 21 times coordinate transformation  form measuring equation with 26 variables. and we utilize Monte Carlo method to calculate the orientation error  analyze the effects of errors upon pointing. The result indicates that the measuring error standard deviation of alt-alt telescope is minimum value about 10? at the zenith zone. and the deviation increases with the rotation angles of longitude and latitude axes. The model and the method not only can analyze and synthesize the main errors  but also provide a reference to the whole design. 2009 SPIE.