全文获取类型
收费全文 | 15338篇 |
免费 | 4056篇 |
国内免费 | 1927篇 |
专业分类
化学 | 1726篇 |
晶体学 | 37篇 |
力学 | 2455篇 |
综合类 | 722篇 |
数学 | 6108篇 |
物理学 | 10273篇 |
出版年
2024年 | 90篇 |
2023年 | 312篇 |
2022年 | 433篇 |
2021年 | 508篇 |
2020年 | 371篇 |
2019年 | 428篇 |
2018年 | 216篇 |
2017年 | 531篇 |
2016年 | 532篇 |
2015年 | 717篇 |
2014年 | 1228篇 |
2013年 | 855篇 |
2012年 | 829篇 |
2011年 | 1057篇 |
2010年 | 1033篇 |
2009年 | 1102篇 |
2008年 | 1259篇 |
2007年 | 977篇 |
2006年 | 970篇 |
2005年 | 858篇 |
2004年 | 906篇 |
2003年 | 873篇 |
2002年 | 747篇 |
2001年 | 669篇 |
2000年 | 544篇 |
1999年 | 462篇 |
1998年 | 368篇 |
1997年 | 366篇 |
1996年 | 340篇 |
1995年 | 364篇 |
1994年 | 297篇 |
1993年 | 225篇 |
1992年 | 200篇 |
1991年 | 184篇 |
1990年 | 186篇 |
1989年 | 149篇 |
1988年 | 42篇 |
1987年 | 33篇 |
1986年 | 16篇 |
1985年 | 12篇 |
1984年 | 5篇 |
1983年 | 12篇 |
1982年 | 8篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1959年 | 2篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
By means of a Painlevé-Baicklund transformation and a multi-linear separation-of-variable approach, abundant localized coherent excitations of a modified Broer-Kaup system are derived. There appear possible phase shifts for the interactions of the (2+1)-dimensional novel localized structures, which are discussed in this paper. 相似文献
992.
Generalized reduced-order synchronization of chaotic system based on fast slide mode 总被引:1,自引:0,他引:1
下载免费PDF全文
![点击此处可从《中国物理》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A new kind of generalized reduced-order synchronization of different chaotic
systems is proposed in this paper. It is shown that dynamical evolution of
third-order oscillator can be synchronized with the canonical projection of
a fourth-order chaotic system generated through nonsingular states
transformation from a cell neural net chaotic system. In this sense, it is
said that generalized synchronization is achieved in reduced-order. The
synchronization discussed here expands the scope of reduced-order
synchronization studied in relevant literatures. In this way, we can achieve
generalized reduced-order synchronization between many famous chaotic
systems such as the second-order D\"{u}ffing system and the third-order
Lorenz system by designing a fast slide mode controller. Simulation results
are provided to verify the operation of the designed synchronization. 相似文献
993.
LINUX下一种改进的音频会议系统的实现方法 总被引:2,自引:0,他引:2
提出了一种计算缓存区大小的改进方案.根据RTCP包中反馈回的丢包率,动态地改变音频数据的发送策略,有区分地采取差错控制手段,提高了网络带宽的利用率.在此基础上,设计了一个以RTP协议为基础的音频会议系统的模型,并在Linux平台上用多线程的方法实现了各个模块.模拟实验表明,该系统能自适应地调整缓存区大小和数据包的发送策略,在实时性及带宽资源的利用上都达到了较理想的效果. 相似文献
994.
Zi-qing Xie Chuan-miao Chen Institute of Computation Hunan Normal University Changsha Hunan China 《应用数学学报(英文版)》2004,20(2):317-322
The multiple solutions for one-dimensional cubic nonlinear problem u" u~3=0,u(0)=u(π)=0are computed,on the basis of the eigenpairs of-φ"_k=λ_(kφk),k=1,2,3....There exist two nonzero solutions±u_k corresponding to each k,and their Morse index MI(k) for 1(?)k(?)20 is to be exactly determined.It isshown by the numerical results that MI(k)(?)k. 相似文献
995.
Regularity Results for the
Generalized Beltrami System 总被引:1,自引:0,他引:1
Abstract
For the generalized Beltrami system with two
characteristic matrices, we deal with the regularity of its very
weak solutions in the Sobolev class
(1 <
r <
n). By changing the
generalized Beltrami system into a class of a divergent elliptic
system with nonhomogeneous items, we obtain that each of its
very weak solutions is essentially a classical weak solution of
a usual Sobolev class. Furthermore, we also establish a higher
regularity of its weak solution if the regularity hypotheses of
two characteristic matrices are improved.
Supported by the National Natural Science Foundation
of China (49805005) and by the research foundation of Northern
Jiaotong University (2002SM061) 相似文献
996.
Jacques Peyriere 《分析论及其应用》2003,19(4):332-341
There are mainly two approaches to the multifractal analysis of measures. The first one, which is used in applications and in studying problems arising from dynamical systems, uses a hierarchy of boxes. The second one, which is more satisfactory from the viewpoint of geometric measure theory, uses more intrinsicconcepts. This article is an account of a work by J. Barral, F. Ben Nasr, and J. Peyriere [3] which pro-vides a bridge between these two theories. 相似文献
997.
998.
高频地波雷达频谱监测系统的前端电路设计 总被引:1,自引:0,他引:1
利用超外差式接收和直接数字合成(DDS)技术设计了高频地波雷达频谱监测系统的前端电路.该电路能够根据雷达探测距离的远近选择相对应的噪声信号接收频段,为后续的数据采集与处理提供噪声电平数据.实验证明:本系统的跳频本振信号信噪比(SNR)优于60dB;对输入信号具有60dB左右的增益和1μV的灵敏度,满足了武汉大学研制的下一代高频地波海态监测雷达对频谱监测的需要. 相似文献
999.
俞亚东 《宁波大学学报(理工版)》2001,14(3):72-75
采用Lotus Domino/Notes文档数据库 Oracle关系数据库的独特结构模式,集成了Microsoft Office Outlook系统软件,主要功能通过浏览器/服务器(B/S)方式实现,系统设计采用了组件化、模块化的思想,为工作流程的定制和公文流转过程的控制提供了强大功能. 相似文献
1000.
Han-Fu ChenAcademy of Mathematics Systems Science Chinese Academy of Sciences Beijing China 《应用数学学报(英文版)》2003,19(4):573-580
Abstract For the multidimensional ARMA system A(z)y_k=C(z)w_k it is shown that stability(det A(z)≠0,z:│z│≤1)of A(z) is equivalent to the trajectory boundedness in the mean square sense(MSS)which,as a rule,is a consequence of a successful stochastic adaptive control leading the closed-loop of an ARMAXsystem to a steady state ARMA system.In comparison with existing results the stability condition imposed onC(z)is no longer needed.The only structural requirement on the system is that det A(z) and det C(z) have nounstable common factor. 相似文献