全文获取类型
收费全文 | 7570篇 |
免费 | 1145篇 |
国内免费 | 750篇 |
专业分类
化学 | 2085篇 |
晶体学 | 107篇 |
力学 | 1402篇 |
综合类 | 43篇 |
数学 | 616篇 |
物理学 | 2047篇 |
无线电 | 3165篇 |
出版年
2024年 | 31篇 |
2023年 | 86篇 |
2022年 | 188篇 |
2021年 | 222篇 |
2020年 | 258篇 |
2019年 | 259篇 |
2018年 | 216篇 |
2017年 | 315篇 |
2016年 | 386篇 |
2015年 | 356篇 |
2014年 | 472篇 |
2013年 | 539篇 |
2012年 | 499篇 |
2011年 | 529篇 |
2010年 | 406篇 |
2009年 | 460篇 |
2008年 | 473篇 |
2007年 | 480篇 |
2006年 | 445篇 |
2005年 | 352篇 |
2004年 | 320篇 |
2003年 | 323篇 |
2002年 | 227篇 |
2001年 | 224篇 |
2000年 | 190篇 |
1999年 | 146篇 |
1998年 | 131篇 |
1997年 | 122篇 |
1996年 | 145篇 |
1995年 | 94篇 |
1994年 | 72篇 |
1993年 | 92篇 |
1992年 | 75篇 |
1991年 | 59篇 |
1990年 | 49篇 |
1989年 | 40篇 |
1988年 | 33篇 |
1987年 | 29篇 |
1986年 | 23篇 |
1985年 | 17篇 |
1984年 | 16篇 |
1983年 | 9篇 |
1982年 | 13篇 |
1981年 | 13篇 |
1980年 | 9篇 |
1979年 | 9篇 |
1978年 | 5篇 |
1973年 | 2篇 |
1971年 | 2篇 |
1957年 | 2篇 |
排序方式: 共有9465条查询结果,搜索用时 31 毫秒
31.
在总结铜氧化物高温超导体晶体结构特点的基础上,提出了以无限层结构Cu-O钙钛矿为核心的结构组装概念,通过和相关结构的外延组合,衍生出了高温超导体的主要晶体构型。进一步运用此观念,建立了新的三元数命名法,并对高温超导体的晶体结构进行了归类。 相似文献
32.
33.
无线网状网技术与应用 总被引:1,自引:0,他引:1
无线网状网(WMNs)由网状路由器节点和客户机节点组成,其中的网状路由器节点组成了无线网状网的网络骨干,其移动性很小。他们一起为无线网状网和其他常规无线网络的客户机节点提供网络的无线接入。WMNs技术结合了中心式控制的蜂窝网与分布式控制的无线自组织网的优点,可有效克服这两种技术的缺陷并显著提高无线网络的性能,已经成为下一代无线通信网络的研究热点之一。WMNs可为无线个域网、局域网、校园网、城域网的一系列应用提供高速无线宽带接入服务。虽然目前WMNs技术发展很快,但其协议栈各层仍存在许多有待研究的课题。首先简要介绍了无线网状网的结构与特点;随后重点分析了其主要的几个应用领域;最后探讨了WMNs各协议层的研究现状与关键技术,并分析了该技术存在的问题及未来的研究方向。 相似文献
34.
35.
Claudio Sacchi Gianluca Gera Carlo S. Regazzoni 《International Journal of Satellite Communications and Networking》2004,22(2):193-215
This paper aims at focusing on the aspects concerning the physical layer design for an innovative satellite communication experiment. Such an experiment, denoted by the acronym DAVID–DCE (Data and Video Interactive Distribution—Data Collection Experiment) is based on the exploitation of the W‐band (75–110 GHz) for high‐bit‐rate satellite transmission. The potential advantages of using of the W‐band are mainly related to the great bandwidth availability, and to the absence of interference. Moreover, an expected result of the experiment is a substantive improvement in the communication system's performances in the presence of meteorological phenomena (e.g. rain) as compared with the more conventional Ka‐band satellite transmission. On the other hand, problems to be faced concern the non‐ideal behaviours of hardware devices employed for high‐frequency digital transmission. In particular, carrier recovery and timing recovery are the most crucial signal‐processing tasks to be carefully considered in the design of the physical level of the system, because they considerably suffer from hardware impairments. The purpose of this work is to illustrate the proposed solutions in terms of the most critical modulation, demodulation and synchronization design issues, together with the effects of non‐ideal behaviours of hardware components on BER performances. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
36.
Mathematical Notes - 相似文献
37.
R. Meyer Hilde Hardtdegen R. Carius D. Grützmacher M. Stollenwerk P. Balk A. Kux B. Meyer 《Journal of Electronic Materials》1992,21(3):293-298
This paper presents a study of the structural and optical properties of strained GaInAs/ InP multiple quantum well (MQW) structures
fabricated by LP-MOVPE. The composition of the Ga
x
In1−x
As films ranged fromx = 0.17 tox = 1.0 and was determined by sputtered neutral mass spectrometry (SNMS) on thick layers. The structures of the MQW samples
with well widths from 1.5 to 5 nm were investigated by high resolution x-ray diffraction (HR-XRD). Simulations of the diffraction
patterns showed that transition layers of approximately 2 monolayer (ML) thickness with high lattice mismatch exist at the
interfaces. Photoluminescence (PL) measurements indicate well widths of a multiple of a monolayer with local variations of
one monolayer. The PL peak energies vary smoothly with the Ga concentration. These results were confirmed by optical absorption
measurements. 相似文献
38.
STN-LCD采用新的取向层,消除了残象;采用新的驱动波形,消除了串扰;采用二(口恶)烷、卤化物、链烯基、醚和二苯乙炔,改进了液晶料材的性能,使STN-LCD获得高的对比度、快的响应速度、低的驱动电压;采用有源矩阵驱动方法,消除了帧响应,使STN-LCD获得高的对比度、高的亮度及视频响应速度;使用温度跟踪电路,自动跟踪STN-LCD的阀值电压,使STN-LCD获得宽的工作温度。 相似文献
39.
Epitaxial CdTe layers were grown using organometallic vapor phase epitaxy on Si substrates with a Ge buffer layer. Ge layer
was grown in the same reactor using germane gas and the reaction of germane gas with the native Si surface is studied in detail
at low temperature. It is shown that germane gas can be used to “clean” the Si surface oxide prior to CdTe growth by first
reducing the thin native oxide that may be present on Si. When Ge layer was grown on Si using germane gas, an induction period
was observed before the continuous layer of Ge growth starts. This induction period is a function of the thickness of the
native oxide present on Si and possible reasons for this behavior are outlined. Secondary ion mass spectrometry (SIMS) data
show negligible outdiffusion and cross contamination of Ge in CdTe. 相似文献
40.
P. Kurpas A. Oster M. Weyers A. Rumberg K. Knorr W. Richter 《Journal of Electronic Materials》1997,26(10):1159-1163
Reflectance anisotropy spectroscopy (RAS) has been used to study As-by-P exchange during metalorganic vapor phase epitaxy.
The study focuses on the processes occurring during switching from GaAs to GaInP, especially the effect of purging PH3 over a GaAs surface. GaAsP/GaAs superlattices of different periodicity were grown and the P-content was determined by high-resolution
x-ray diffraction and correlated to the RAS spectra. From the temperature dependence of the P-content, an activation energy
of 0.56 eV was estimated for the incorporation mechanism. In addition to the insights into the processes at mixed group-V
heterointerfaces, our study demonstrates the reproducibility of RAS transients that thus can be used for process monitoring. 相似文献