全文获取类型
收费全文 | 10449篇 |
免费 | 1705篇 |
国内免费 | 1552篇 |
专业分类
电工技术 | 1000篇 |
综合类 | 1884篇 |
化学工业 | 516篇 |
金属工艺 | 83篇 |
机械仪表 | 544篇 |
建筑科学 | 485篇 |
矿业工程 | 194篇 |
能源动力 | 187篇 |
轻工业 | 224篇 |
水利工程 | 197篇 |
石油天然气 | 201篇 |
武器工业 | 138篇 |
无线电 | 1360篇 |
一般工业技术 | 1132篇 |
冶金工业 | 182篇 |
原子能技术 | 95篇 |
自动化技术 | 5284篇 |
出版年
2024年 | 61篇 |
2023年 | 185篇 |
2022年 | 244篇 |
2021年 | 330篇 |
2020年 | 426篇 |
2019年 | 469篇 |
2018年 | 441篇 |
2017年 | 529篇 |
2016年 | 531篇 |
2015年 | 522篇 |
2014年 | 648篇 |
2013年 | 962篇 |
2012年 | 821篇 |
2011年 | 847篇 |
2010年 | 675篇 |
2009年 | 731篇 |
2008年 | 744篇 |
2007年 | 703篇 |
2006年 | 619篇 |
2005年 | 572篇 |
2004年 | 455篇 |
2003年 | 351篇 |
2002年 | 244篇 |
2001年 | 255篇 |
2000年 | 245篇 |
1999年 | 170篇 |
1998年 | 155篇 |
1997年 | 126篇 |
1996年 | 102篇 |
1995年 | 103篇 |
1994年 | 85篇 |
1993年 | 70篇 |
1992年 | 56篇 |
1991年 | 51篇 |
1990年 | 31篇 |
1989年 | 26篇 |
1988年 | 21篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1980年 | 11篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 9篇 |
1966年 | 2篇 |
1959年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
讨论了输出终端带不等式约束情形的多输入多输出系统,说明了这些约束可以通过修改输入柔化系数而使其得以满足,在柔化系数的选择范围确定过程中,为了避免矩阵求逆,采用利用已知数据辨识参数的方法来确定柔化系数,从而使得问题简化。降低了计算量且加快了收敛速度。 相似文献
2.
G. Martinez 《Journal of Low Temperature Physics》2003,133(1-2):61-95
High magnetic fields are one of the most powerful tools available to scientists for the study, modification and control of matter. This includes the knowledge on correlations effects, interaction mechanisms, structural information and understanding of mesoscopic effects. In this context, a review of recent scientific achievements at the Grenoble High Magnetic Laboratory is given to illustrate, on specific examples, the power of the Magnetic Field probe. 相似文献
3.
Javier Ramírez Antonio García Uwe Meyer-Bäse Fred Taylor Antonio Lloris 《The Journal of VLSI Signal Processing》2003,33(1-2):171-190
Currently there are design barriers inhibiting the implementation of high-precision digital signal processing (DSP) objects with field programmable logic (FPL) devices. This paper explores overcoming these barriers by fusing together the popular distributed arithmetic (DA) method with the residue number system (RNS) for use in FPL-centric designs. The new design paradigm is studied in the context of a high-performance filter bank and a discrete wavelet transform (DWT). The proposed design paradigm is facilitated by a new RNS accumulator structure based on a carry save adder (CSA). The reported methodology also introduces a polyphase filter structure that results in a reduced look-up table (LUT) budget. The 2C-DA and RNS-DA are compared, in the context of a FPL implementation strategy, using a discrete wavelet transform (DWT) filter bank as a common design theme. The results show that the RNS-DA, compared to a traditional 2C-DA design, enjoys a performance advantage that increases with precision (wordlength). 相似文献
4.
Gabriel Wainer 《Software》2002,32(13):1261-1306
The features of a toolkit for modeling and simulation based on the DEVS formalism are presented. The tool is built as a set of independent software pieces running on different platforms. Not only are the main characteristics of the environment presented, a focus on its use is also considered by inclusion of application examples for a variety of problems. Many models can be defined in an automated fashion, simplifying the construction of new models and easing their verification. The use of this formal approach has allowed the development of safe and cost‐effective simulations, significantly reducing development time. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
5.
Average consensus in networks of dynamic agents with switching topologies and multiple time-varying delays 总被引:5,自引:0,他引:5
In this paper, we discuss average consensus problem in undirected networks of dynamic agents with fixed and switching topologies as well as multiple time-varying communication delays. By employing a linear matrix inequality method, we prove that all the nodes in the network achieve average consensus asymptotically for appropriate communication delays if the network topology is connected. Particularly, several feasible linear matrix inequalities are established to determine the maximal allowable upper bound of time-varying communication delays. Numerical examples are given to demonstrate the effectiveness and the sharpness of the theoretical results. 相似文献
6.
本文介绍了IBM-PC系列计算机通过RS-232C串行口与多个单片微机组成的分布式系统中一种可双向选通串行通信共享器的设计方法。给出通信共享器的设计电路;并对电路工作原理进行了详细剖析。 相似文献
7.
1 IntroductionSince 1 990 ,chaoticsynchronization[1~ 4] andchaoticcontrolling[5~6] havereceivedagreatdealofattention[7~1 1 ] ,andchaoticsynchronizationisaphenomenonofinterestinfieldsfromelectronicstocommunication[1 2 ] ,andfrombiophysicstoneuro science[1 3] .Ifchaoticsync… 相似文献
8.
本文介绍红外热象技术在工程热物理研究中某些应用的探索。作为实例,通过热象技术,实验研究了具有水平凸台离散热源的倾斜板的散热,在研究它的自然对流换热部份结合利用激光全息干涉技术。此间着重于分析倾斜角对散热的影响。 相似文献
9.
本文利用等效工作站理论和工件流平衡原理,推导出非串行离散事件生产线可以等价于串联系统,并归结为装配和拆卸两条定理,解决了系统的建模、分析与设计问题。 相似文献
10.
Rein Smedinga 《Discrete Event Dynamic Systems》1993,2(3-4):265-297
To model qualitative aspects of discrete event systems, i.e., the order of the events is of sole importance, we use a triple consisting of the set of all possible events (the alphabet), the set of all behavior (possible strings of events), and the set of all tasks (completed behavior). We use this view to model synchronous as well as asynchronous connection of systems. Moreover, it is easy to define notions like deadlock and livelock in this view. We give a method to construct a second system that, in connection with the original system, gets rid of its deadlock and/or livelock. A state-space representation is introduced. In this representation computations can be done effectively. 相似文献