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• 数学与系统科学研究院 [7]
• 长春光学精密机械与物... [3]
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• OAI收割 [11]

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• 期刊论文 [8]
• 会议论文 [3]

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• 2017 [1]
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• Water Reso... [1]

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浏览/检索结果: 共11条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Use of double mass curves in hydrologic benefit evaluations 期刊论文  OAI收割 HYDROLOGICAL PROCESSES, 2017, 卷号: 31, 期号: 26, 页码: 4639-4646 作者:  Gao, Peng;  Li, Pengfei;  Zhao, Baili;  Xu, Ruirui;  Zhao, Guangju   |  收藏  |  浏览/下载：28/0  |  提交时间：2018/04/12 Application Example  Changing Points  Derivation Procedure  Double Mass Curves (Dmc)  Hydrologic Benefit Evaluations   The aircraft autopilot design of parameters changing in a wide range (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China Zhen D.; Yue Z. 收藏  |  浏览/下载：28/0  |  提交时间：2013/03/25 Autopilot is an important part of aircraft  Under the action of the disturbance torque  for the flight parameters of aircraft Changing in a wide range  the range was about 16km  on the basic of analyzing the typical trajectory  the max height was about 5100m  the trajectory of feature points were selected  the deviation of lateral was about 12m  taking pitch control loop for example  the maximum angle of attack was about 3.6  a sub- PID autopilot was designed using classical control theory  the maximum elevator deflection was less than 5  using single-mode Transient suppression method  the maximum aileron deflection was less than 2  the overload due to control surface transition deflection was avoided when control parameters changing  the maximum roll was less than 5  the verification was done by non-linear simulation. The result showed that: the phase margin of autopilot was greater than 30  the response of overload can accurately track the given overload instruction. An autopilot design method of aircraft of parameter changes in a wide range was provided. 2011 IEEE.  the bandwidth was more than 14rad / s  the settling time was less than 0.7s  the maximum overshoot was 23.3%   The analysis for the reason of limit cycle generated by friction in servo system (EI CONFERENCE) 会议论文  OAI收割 2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China 作者:  Li M. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 In this paper  limit cycle which results from friction during low-velocity servo system has been discussed. First  the piecewise linearization method has been applied to change nonlinear stribeck model to linear model. Second  with analysis of equilibrium property  it is proved the existence of limit cycle and its certain region. The analysis reveals that it is because of stability of equilibrium repeatedly changing results in the limit cycle during low-velocity state. In addition  it also points that the key point to avoid this phenomenon is to keep robust stability of the close-loop system. 2010 IEEE.   Sign-changing and multiple solutions of Kirchhoff type problems without the PS condition 期刊论文  OAI收割 NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, 2009, 卷号: 70, 期号: 3, 页码: 1275-1287 作者:  Mao, Anmin;  Zhang, Zhitao   |  收藏  |  浏览/下载：16/0  |  提交时间：2018/07/30 Critical points  Sign-changing solutions and multiple solutions  Kirchhoff type nonlocal problems   A new algorithm of image segmentation for overlapping grain image (EI CONFERENCE) 会议论文  OAI收割 ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China 作者:  Zhang X.;  Zhang X.;  Zhang X. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 Image segmentation is primary issue in image processing  at the same time it is principal problem in low level vision in computer vision field. It is the key technology to process image analysis  image comprehend and image depict successfully. Aim at measurement of granularity size of nonmetal grain  a new algorithm of image segmentation and parameters calculation for overlapping grain image is studied. The hypostasis of this algorithm is present some new attributes of graph sequence from discrete attribute of graph  consequently achieve that pick up the geometrical characteristics from input graph  and new graph sequence which in favor of image segmentation is recombined. The conception that image edge denoted with "twin-point" is put forward  base on geometrical characters of point  image edge is transformed into serial edge  and on recombined serial image edge  based on direction vector definition of line and some additional restricted conditions  the segmentation twin-points are searched with  thus image segmentation is accomplished. Serial image edge is transformed into twin-point pattern  to realize calculation of area and granularity size of nonmetal grain. The inkling and uncertainty on selection of structure element which base on mathematical morphology are avoided in this algorithm  and image segmentation and parameters calculation are realized without changing grain's self statistical characters.   Elliptic equations in R-2 with one-sided exponential growth 期刊论文  OAI收割 COMMUNICATIONS IN CONTEMPORARY MATHEMATICS, 2004, 卷号: 6, 期号: 6, 页码: 947-971 作者:  Zhang, ZT;  Calanchi, M;  Ruf, B   |  收藏  |  浏览/下载：9/0  |  提交时间：2018/07/30 critical points  one-sided exponential growth  sign-changing solutions  critical growth   On bifurcation, critical groups and exact multiplicity of solutions to semilinear elliptic boundary value problems 期刊论文  OAI收割 NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, 2004, 卷号: 58, 期号: 5-6, 页码: 535-546 作者:  Zhang, ZT   |  收藏  |  浏览/下载：15/0  |  提交时间：2018/07/30 bifurcation  critical points  critical groups  sign-changing solutions   Construction of pseudo-gradient vector field and sign-changing multiple solutions involving p-Laplacian 期刊论文  OAI收割 JOURNAL OF DIFFERENTIAL EQUATIONS, 2004, 卷号: 201, 期号: 2, 页码: 287-303 作者:  Zhang, ZT;  Chen, JQ;  Li, SJ   |  收藏  |  浏览/下载：20/0  |  提交时间：2018/07/30 critical points  multiple solutions  sign-changing solution  p-Laplacian   On sign-changing and multiple solutions of the p-Laplacian 期刊论文  OAI收割 JOURNAL OF FUNCTIONAL ANALYSIS, 2003, 卷号: 197, 期号: 2, 页码: 447-468 作者:  Zhang, ZT;  Li, SJ   |  收藏  |  浏览/下载：22/0  |  提交时间：2018/07/30 critical points  p-Laplacian  sign-changing solutions  multiple solutions  jumping nonlinearities   Fucik spectrum, sign-changing and multiple solutions for semilinear elliptic boundary value problems with jumping nonlinearities at zero and infinity 期刊论文  OAI收割 SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY, 2001, 卷号: 44, 期号: 7, 页码: 856-866 作者:  Li, SJ;  Zhang, ZT   |  收藏  |  浏览/下载：15/0  |  提交时间：2018/07/30 Fucik spectrum  critical points  critical groups  sign-changing solutions  Dirichlet problems  jumping nonlinearities