全文获取类型
收费全文 | 60269篇 |
免费 | 7094篇 |
国内免费 | 4242篇 |
专业分类
电工技术 | 5464篇 |
技术理论 | 2篇 |
综合类 | 4941篇 |
化学工业 | 8393篇 |
金属工艺 | 3437篇 |
机械仪表 | 4063篇 |
建筑科学 | 4865篇 |
矿业工程 | 2057篇 |
能源动力 | 1882篇 |
轻工业 | 4713篇 |
水利工程 | 1569篇 |
石油天然气 | 2869篇 |
武器工业 | 812篇 |
无线电 | 7743篇 |
一般工业技术 | 6129篇 |
冶金工业 | 2418篇 |
原子能技术 | 900篇 |
自动化技术 | 9348篇 |
出版年
2024年 | 339篇 |
2023年 | 1048篇 |
2022年 | 2157篇 |
2021年 | 3082篇 |
2020年 | 2212篇 |
2019年 | 1754篇 |
2018年 | 1878篇 |
2017年 | 2165篇 |
2016年 | 2004篇 |
2015年 | 2882篇 |
2014年 | 3604篇 |
2013年 | 4269篇 |
2012年 | 4988篇 |
2011年 | 5107篇 |
2010年 | 4630篇 |
2009年 | 4370篇 |
2008年 | 4179篇 |
2007年 | 3983篇 |
2006年 | 3649篇 |
2005年 | 2887篇 |
2004年 | 2029篇 |
2003年 | 1514篇 |
2002年 | 1440篇 |
2001年 | 1161篇 |
2000年 | 877篇 |
1999年 | 704篇 |
1998年 | 498篇 |
1997年 | 382篇 |
1996年 | 366篇 |
1995年 | 318篇 |
1994年 | 227篇 |
1993年 | 160篇 |
1992年 | 132篇 |
1991年 | 104篇 |
1990年 | 83篇 |
1989年 | 69篇 |
1988年 | 50篇 |
1987年 | 33篇 |
1986年 | 41篇 |
1985年 | 19篇 |
1984年 | 19篇 |
1983年 | 15篇 |
1982年 | 16篇 |
1981年 | 16篇 |
1980年 | 18篇 |
1979年 | 18篇 |
1978年 | 11篇 |
1977年 | 10篇 |
1976年 | 25篇 |
1975年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
82.
索风营水电站因工程区喀斯特水文地质条件复杂,松散堆积体、危岩体、滑坡等不良地质体分布广泛,断裂、褶皱极为发育,故岩体连续性及完整性差,从而带来水库渗漏、枢纽区边坡稳定、库首渗漏、地下洞室喀斯特涌水涌泥、围岩稳定、软弱地基等一系列的工程地质问题,在乌江流域水电开发建设过程中具有代表性和典型性。本文从勘测、分析评价及工程处理等方面对该电站各种工程地质问题进行了总结。 相似文献
83.
反渗透膜仓用韧性环氧树脂基体研究 总被引:1,自引:0,他引:1
工业上广泛使用反渗透膜仓制备高纯水,为了用玻璃钢替代不锈钢,研究了一种适合湿法缠绕的反渗透膜仓用韧性环氧基体。在配方中采用液体酸酐固化剂甲基四氢邻苯二甲酸酐和高效活性增韧剂,对树脂基体和复合材料力学性能及耐水性能的研究表明该树脂基体具有许多优良性能,如拉伸强度≥86.2MPa,断裂延伸率≥5.2%,弯曲强度≥139MPa,制得膜仓爆破时纤维强度转化率高达88.7%,耐疲劳达10万次而无损伤。此外,配方体系室温下粘度为0.35~0.4Pa·s,适用期≥8h,室温下在水中浸泡180d后吸水率低于0.5%,同不锈钢相比成本降低1/2。实验结果表明,该韧性环氧基体完全适用于反渗透膜仓使用。 相似文献
84.
85.
软交换技术的发展及其应用 总被引:1,自引:0,他引:1
软交换是下一代网络NGN的核心技术,本文从软交换的概念入手,介绍了软交换的基本功能及其优点.软交换的网络系统结构、软交换的对外接口等内容,并探讨了软交换技术的应用。 相似文献
86.
本文针对背景噪声为冲击噪声的情况,提出了一种新的近场源二维参数估计方法.本方法利用协变异(或协变异系数)构造矩阵,并通过求根的方法估计近场源的方向角和距离参数.该算法可以抑制冲击噪声对估计性能的影响,同时具有无需谱峰搜索的优点.仿真实验证明了该算法的有效性. 相似文献
87.
M. K. Bakhadyrkhanov O. É. Sattarov Kh. M. Iliev K. S. Ayupov Tuérdi Umaier 《Semiconductors》2005,39(7):789-791
It is experimentally ascertained that light stimulates the negative magnetoresistance observed in a high electric field in silicon doped with boron and manganese. The optimum conditions (the electric field, temperature, illumination, and resistivity of the material) for observation of the largest magnitude of negative magnetoresistance in (Si:B):Mn are determined. The dependence of the negative magnetoresistance on the concentration of compensating impurity is established. 相似文献
88.
In recent years, constructing a virtual backbone by nodes in a connected dominating set (CDS) has been proposed to improve the performance of ad hoc wireless networks. In general, a dominating set satisfies that every vertex in the graph is either in the set or adjacent to a vertex in the set. A CDS is a dominating set that also induces a connected sub‐graph. However, finding the minimum connected dominating set (MCDS) is a well‐known NP‐hard problem in graph theory. Approximation algorithms for MCDS have been proposed in the literature. Most of these algorithms suffer from a poor approximation ratio, and from high time complexity and message complexity. In this paper, we present a new distributed approximation algorithm that constructs a MCDS for wireless ad hoc networks based on a maximal independent set (MIS). Our algorithm, which is fully localized, has a constant approximation ratio, and O(n) time and O(n) message complexity. In this algorithm, each node only requires the knowledge of its one‐hop neighbours and there is only one shortest path connecting two dominators that are at most three hops away. We not only give theoretical performance analysis for our algorithm, but also conduct extensive simulation to compare our algorithm with other algorithms in the literature. Simulation results and theoretical analysis show that our algorithm has better efficiency and performance than others. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
89.
Stress analysis of spontaneous Sn whisker growth 总被引:5,自引:0,他引:5
K. N. Tu Chih Chen Albert T. Wu 《Journal of Materials Science: Materials in Electronics》2007,18(1-3):269-281
Spontaneous Sn whisker growth is a surface relief phenomenon of creep, driven by a compressive stress gradient. No externally
applied stress is required for the growth, and the compressive stress is generated within, from the chemical reaction between
Sn and Cu to form the intermetallic compound Cu6Sn5 at room temperature. To obtain the compressive stress gradient, a break of the protective oxide on the Sn surface is required
because the free surface of the break is stress-free. Thus, spontaneous Sn whisker growth is unique that stress relaxation
accompanies stress generation. One of the whisker challenging issues in understanding and in finding effective methods to
prevent spontaneous Sn whisker growth is to develop accelerated tests of whisker growth. Use of electromigration on short
Sn stripes can facilitate this. The stress distribution around the vicinity and the root of a whisker can be obtained by using
the micro-beam X-ray diffraction utilizing synchrotron radiation. A discussion of how to prevent spontaneous Sn whisker growth
by blocking both stress generation and stress relaxation is given. 相似文献
90.
Effects of surfactant/silica and silica/cerium ratios on the characteristics of mesoporous Ce-MCM-41
Se Ho Park Bo Yune Song Tai Gyu Lee 《Journal of Industrial and Engineering Chemistry》2008,14(2):261-264
Using the surfactant CTMABr (cetyltrimethyl ammonium bromide) and cerium(IV) sulfate, mesoporous Ce-MCM-41 molecular sieves were produced under a hydrothermal condition with various surfactant/silica (surfactant/Si) and silica/cerium (Si/Ce) ratios. Changes to the structural traits caused by changing the molar ratios of both surfactant/Si and Si/Ce were investigated. XRD (X-ray diffraction), FT-IR (fourier transform infrared spectroscopy), and SEM (scanning electro microscopy) were used for the characterization of prepared mesoporous samples. Among the tested molar ratios, surfactant/Si ratio of 0.5 and 0.2 showed highest values of d1 0 0 and intensity, respectively, for the Si-MCM-41. XRD analysis also identified a quintessential hexagonal structure of Ce-MCM-41 for the Si/Ce molar ratio higher than 40 (maintaining the surfactant/Si ratio at 0.2). When cerium content was increased to have the Si/Ce molar ratio of 20, the hexagonal structure of Ce-MCM-41 was collapsed due to the structural stress of substituted cerium. FT-IR results confirmed calcination of Ce-MCM-41 and the incorporation of Ce4+ ions of cerium sulfate into the silica surface with proper removal of the surfactant. Rod-like shape with rounded edges of the prepared Ce-MCM-41 samples was identified by SEM. These results suggest surfactant/Si ratio of 0.2 and Si/Ce ratio of 40 for the production of Ce-MCM-41 with the highest level of crystallinity. 相似文献