全文获取类型
收费全文 | 9864篇 |
免费 | 917篇 |
国内免费 | 483篇 |
专业分类
电工技术 | 533篇 |
技术理论 | 1篇 |
综合类 | 730篇 |
化学工业 | 1614篇 |
金属工艺 | 678篇 |
机械仪表 | 669篇 |
建筑科学 | 670篇 |
矿业工程 | 305篇 |
能源动力 | 252篇 |
轻工业 | 714篇 |
水利工程 | 192篇 |
石油天然气 | 614篇 |
武器工业 | 94篇 |
无线电 | 1119篇 |
一般工业技术 | 1203篇 |
冶金工业 | 472篇 |
原子能技术 | 107篇 |
自动化技术 | 1297篇 |
出版年
2024年 | 44篇 |
2023年 | 206篇 |
2022年 | 327篇 |
2021年 | 464篇 |
2020年 | 340篇 |
2019年 | 281篇 |
2018年 | 328篇 |
2017年 | 396篇 |
2016年 | 273篇 |
2015年 | 422篇 |
2014年 | 549篇 |
2013年 | 607篇 |
2012年 | 714篇 |
2011年 | 663篇 |
2010年 | 672篇 |
2009年 | 596篇 |
2008年 | 541篇 |
2007年 | 545篇 |
2006年 | 574篇 |
2005年 | 447篇 |
2004年 | 314篇 |
2003年 | 263篇 |
2002年 | 267篇 |
2001年 | 220篇 |
2000年 | 191篇 |
1999年 | 197篇 |
1998年 | 164篇 |
1997年 | 128篇 |
1996年 | 104篇 |
1995年 | 89篇 |
1994年 | 84篇 |
1993年 | 48篇 |
1992年 | 54篇 |
1991年 | 39篇 |
1990年 | 23篇 |
1989年 | 15篇 |
1988年 | 19篇 |
1987年 | 9篇 |
1986年 | 18篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 11篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 6篇 |
1978年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
通过对相变增韧陶瓷及一种可切削玻璃-陶瓷动态疲劳(恒应力速率)试验中高应力速率区断裂应力下降现象的理论分析,发现这种现象与材料的阻力特性(R-curve)密切相关。确立的σ_f-σ理论关系能够很好地描述整个应力速率区间内的动态疲劳试验结果。高应力速率区σ_f-σ在双对数坐标下为负斜率直线,直线斜率为(m为阻力曲线KR=k(△a)~m的指数),断裂主要由材料阻力行为控制;低应力速率区,σ_f-σ在双对数坐标下为正斜率直线,直线斜率为 (n为应力腐蚀指数),断裂主要由材料应力腐蚀行为控制。建立了测定材料阻力特性的一种新方法,分别用这种方法及压痕/弯曲方法对一种可切削玻璃-陶瓷的阻力特性进行了实验测定,两种方法所得结果有很好的一致性。 相似文献
3.
文章分析了我国目前生产加气混凝土制品的各种切割工艺及采用的切割设备--地翻型切割机、空中翻转型切割机、长杆式切割机、预铺式切割机、压入式切割机、栅条式切割机(JQS)钢带式切割机的工艺特点.介绍了选用这些切割机应注意的问题,指出必须结合实际的生产工艺、产品要求及场地特点、投资大小合理选择切割机. 相似文献
4.
Novel algorithms for shared segment protection 总被引:8,自引:0,他引:8
Dahai Xu Yizhi Xiong Chunming Qiao 《Selected Areas in Communications, IEEE Journal on》2003,21(8):1320-1331
The major challenges in designing survivable schemes are how to allocate a minimal amount of spare resources (e.g., bandwidth) using fast (e.g., polynomial-time) algorithms, and, in case a failure occurs, to be able to recover quickly from it. All existing approaches invariably make tradeoffs. We propose novel shared segment protection algorithms which make little or no compromise . We develop an elegant integer linear programming (ILP) model to determine an optimal set of segments to protect a given active path. Although the ILP approach is useful for a medium-size network, it is too time consuming for large networks. Accordingly, we also design a fast heuristic algorithm based on dynamic programming to obtain a near-optimal set of segments. Although the heuristic algorithm has a polynomial time complexity, it can achieve a bandwidth efficiency as high as some best-performing shared path protection schemes and, at the same time, much faster recovery than these shared path protection schemes. The proposed scheme is also applicable to a wide range of networking technologies, including Internet Protocol and wavelength-division multiplexing networks under the generalized multiprotocol label switched framework. 相似文献
5.
本文着重将目前国外比较活跃的几种新型反垣克武器;软杀伤反坦克弹药,末敏弹,反坦克地雷以及智能反坦克子弹药的基本原理,作战效能,装备情况作一介绍,并对其发展方向进行了预测。 相似文献
6.
7.
A time domain approach for avoiding crosstalk in optical blockingmultistage interconnection networks
Chunming Qiao Melhem R.G. Chiarulli D.M. Levitan S.P. 《Lightwave Technology, Journal of》1994,12(10):1854-1862
Crosstalk in multistage interconnection networks can be avoided by ensuring that a switch is not used by two connections simultaneously, in order to support crosstalk-free communications among N inputs and N outputs, a space domain approach dilates an N×N network into one that is essentially equivalent to a 2N×2N network. Path conflicts, however may still exist in dilated networks. This paper proposes a time domain approach for avoiding crosstalk. Such an approach can be regarded as “dilating” a network in time, instead of space. More specifically, the connections that need to use the same switch are established during different time slots. This way, path conflicts are automatically avoided. The time domain dilation is useful for overcoming the limits on the network size while utilizing the high bandwidth of optical interconnects. We study the set of permutations whose crosstalk-free connections can be established in just two time slots using the time domain approach. While the space domain approach trades hardware complexity for crosstalk-free communications, the time domain approach trades time complexity. We compare the proposed time domain to the space domain approach by analyzing the tradeoffs involved in these two approaches 相似文献
8.
One-dimensional linear stability analysis was performed for single-phase lead–bismuth eutectic (LBE) natural circulation. The Nyquist criterion and a root search method were employed to find the linear stability boundary of both forward and backward circulations. It was found that the natural circulations could be linearly unstable in a high Reynolds number region. Increasing loop friction makes a forward circulation more stable, but destabilizes the corresponding backward circulation under the same heating/cooling conditions. The characteristic wavelength of an unstable disturbance is roughly equal to the entire loop length. 相似文献
9.
Anthraquinone [1, 2-C] methylisoxazole is synthesized from 2-ethylanthraquinone through nitration and treating with oleum. The different methods of 2-ethylanthraquinone nitrated were discussed. The optimum conditions were determined. The structure of the product was confirmed by MS and 1H NMR. 相似文献
10.
The paramagnetic Meissner effect (PME) was observed on the field-cooled M-T curvesof melt-textured Y0.99Nd0.01Ba2Cu3O7-y in applied magnetic fields from 1kOe toJ0kOe. In the magnetic field below 1kOe, the sample undergoes the typical transi-tion from the normal state to the superconducting state when it was cooled down. Theapplied magnetic fields in which the PME occurs, are very high compared with thefields reported in literatures. We propose that the occurrence of the PME may be dueto a phase transition of flux vortices in the superconductors. 相似文献