首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   15818篇
  免费   225篇
  国内免费   550篇
系统科学   1490篇
丛书文集   847篇
教育与普及   1987篇
理论与方法论   139篇
现状及发展   939篇
研究方法   1346篇
综合类   9803篇
自然研究   42篇
  2018年   44篇
  2017年   65篇
  2016年   62篇
  2015年   75篇
  2014年   145篇
  2013年   89篇
  2012年   743篇
  2011年   949篇
  2010年   267篇
  2009年   109篇
  2008年   781篇
  2007年   926篇
  2006年   1089篇
  2005年   1257篇
  2004年   1009篇
  2003年   1049篇
  2002年   772篇
  2001年   671篇
  2000年   839篇
  1999年   361篇
  1998年   136篇
  1997年   88篇
  1996年   88篇
  1995年   73篇
  1994年   101篇
  1993年   158篇
  1992年   133篇
  1991年   140篇
  1990年   127篇
  1989年   140篇
  1988年   180篇
  1987年   191篇
  1986年   229篇
  1985年   221篇
  1984年   238篇
  1983年   217篇
  1982年   220篇
  1981年   184篇
  1980年   152篇
  1979年   90篇
  1970年   70篇
  1964年   34篇
  1959年   227篇
  1958年   372篇
  1957年   280篇
  1956年   250篇
  1955年   235篇
  1954年   255篇
  1948年   59篇
  1946年   37篇
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
161.
Adaptive control of system with hysteresis using neural networks   总被引:1,自引:0,他引:1  
1.INTRODUCTIONThe piezoelectric actuators are well suited for micro-position devices in precision engineering because oftheir fast response,nanometer resolution and biggerdriving force[1].However,hysteresis inherent topiezoelectric actuator severely li mits system’s perfor-mance such as giving rise to undesirable accuracy oroscillations,even leading to instability.Hysteresischaracteristics are generally nondifferentiable andusually unknown.It is a difficult task to mitigate itsharmful ef…  相似文献   
162.
1.INTRODUCTIONAs a system becomes more and more intelligent andflexible,the systemrequires more sensors,actuators,and controllers,which are often referred to as fielddevices.In most cases,these field devices requiresome type of electrical connection because they aredistributed over a certain area.Conventionally thesedevices are connected with point-to-point connec-tions,whichis not suitable any more for modern in-dustrial control systems,because the number of cableis proportional tothe squ…  相似文献   
163.
1 .INTRODUCTIONIn nature ,there are various external disturbancesaffecting the performances of systems . Many con-trol problemsinvolve designing a controller capableof stabilizing a given linear system while mini mi-zing the worst-case response to some additive dis-turbances . This problemis relevant to disturbancerejection and cancellation. One application area ofinterest is flight control through wind shear ,where disturbances arise from a modal for windshear based on harmonic oscillati…  相似文献   
164.
Target tracking based on frequency spectrum amplitude   总被引:1,自引:0,他引:1  
1 .INTRODUCTIONIn target tracking, attribute parameters can beused to i mprove the performance of data associa-tion. The probabilistic data association ( PDA)which employ the attribute enhance the capabilityof data association and i mprove the performancefor target tracking. The method of PDA is per-formedin the environment of high signal to noise(SNR) generally and the SNRis in excess of 10dB.But the SNRinthe actual environment is lowerthan 10 dB commonly . When SNRis below0 dB,…  相似文献   
165.
Efficient structures for wideband digital receiver   总被引:1,自引:0,他引:1  
1 .INTRODUCTIONWith the development of high perfor mance ana-logue-to-digital converters ( ADC) , applicationspecific integrated circuit ( ASIC) devices anddigital signal processing ( DSP) technology , dig-ital receiver has increasingly become popular inrecent years[1 ~7]. The digital receiver is a typi-cal application of software radio in radar . Itsmain purpose is to move the digital conversionprocess closer to the antenna and execute mainfunctions on general hardware . But the sign…  相似文献   
166.
Sensor management based on fisher information gain   总被引:2,自引:0,他引:2  
1 .INTRODUCTIONSensor management can be described as a systemor process that provides automatic or semi-auto-matic control of a group of sensors[1]. The basicobjective of sensor management is to select rightsensors to do the right service on the right targetat right ti me based on external measurements orcriteria[2]. A variety of techniques have been pro-posed or appliedtothe area of sensor management .One of the first articles to apply opti mization tech-nique to sensor management is by …  相似文献   
167.
1 .INTRODUCTIONA mobile Ad hoc network refers to a temporal multi-hop autonomy system,whichis constituted by a groupof mobile nodes containing wireless send-receive equip-ments[1].It possesses manycharacteristics-fast-deploy-able,self-organized,acentric , movable and of multi-hop.It can be wildly applied to many fields ,such asnational defense,emergency and disaster ,scientificin-vestigation and exploration etc .,and uponthat ,it hasgreat prospects[1 ,3 6]. With the wide spread of mo-bile…  相似文献   
168.
1. INTRODUCTION Many researches have been made on automatic target recognition (ATR) from SAR images in the past few years. Lincoln Laboratory has developed a complete, end-to-end ATR system[1-4]. The whole system inclu- des three stages: detection (or prescreening), discri- mination and classification. In the detection stage, a two-parameter CFAR (constant false alarm rate) detector is used as a prescreener to select candidate targets in an SAR image on the basis of local brightne…  相似文献   
169.
1. INTRODUCTION Large-scale dynamic system theory has been intensi- vely studied during the past decade[1~3], but for fuzzy large-scale systems, namely large-scale systems comp- osed of a series of fuzzy subsystems, has been seldom done in literature. In Ref.[4], decentralized stabiliz- ation problem of fuzzy large-scale systems composed of a series of fuzzy subsystems was considered. Sufficient conditions for asymptotic stability of the fuzzy large-scale system and design methods of dec…  相似文献   
170.
1. INTRODUCTION Weapon equipments acquisition and demonstration has become more and more prominent in the informationalized war conditions while operational effectiveness evaluation is its core part. The compl- exity and uncertainty of weapon systems operational effectiveness evaluation make traditional analysis methods or expert evaluation methods less effective to solve problems. Simulation based operational effe- ctiveness evaluation is an efficient solution. The increased complexity o…  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号