全文获取类型
收费全文 | 23595篇 |
免费 | 2864篇 |
国内免费 | 1711篇 |
专业分类
电工技术 | 2298篇 |
技术理论 | 2篇 |
综合类 | 2860篇 |
化学工业 | 2387篇 |
金属工艺 | 404篇 |
机械仪表 | 866篇 |
建筑科学 | 2504篇 |
矿业工程 | 1236篇 |
能源动力 | 791篇 |
轻工业 | 1929篇 |
水利工程 | 1664篇 |
石油天然气 | 2220篇 |
武器工业 | 225篇 |
无线电 | 2046篇 |
一般工业技术 | 1857篇 |
冶金工业 | 785篇 |
原子能技术 | 112篇 |
自动化技术 | 3984篇 |
出版年
2024年 | 119篇 |
2023年 | 359篇 |
2022年 | 688篇 |
2021年 | 768篇 |
2020年 | 877篇 |
2019年 | 784篇 |
2018年 | 767篇 |
2017年 | 921篇 |
2016年 | 1091篇 |
2015年 | 1032篇 |
2014年 | 1538篇 |
2013年 | 1646篇 |
2012年 | 1715篇 |
2011年 | 1918篇 |
2010年 | 1409篇 |
2009年 | 1367篇 |
2008年 | 1287篇 |
2007年 | 1575篇 |
2006年 | 1404篇 |
2005年 | 1214篇 |
2004年 | 974篇 |
2003年 | 844篇 |
2002年 | 651篇 |
2001年 | 531篇 |
2000年 | 460篇 |
1999年 | 406篇 |
1998年 | 331篇 |
1997年 | 296篇 |
1996年 | 224篇 |
1995年 | 216篇 |
1994年 | 184篇 |
1993年 | 121篇 |
1992年 | 81篇 |
1991年 | 83篇 |
1990年 | 64篇 |
1989年 | 48篇 |
1988年 | 44篇 |
1987年 | 23篇 |
1986年 | 27篇 |
1985年 | 10篇 |
1984年 | 16篇 |
1983年 | 14篇 |
1982年 | 12篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 6篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1961年 | 2篇 |
1958年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
生态省生态市及生态县标准研究 总被引:16,自引:1,他引:15
生态省、生态市、生态县建设的实质是可持续发展能力建设。其主要内容包括生态经济、生态环境和生态社会三个方面,文章建立的标准基本上反映这三个方面的建设现状和发展潜力。生态省标准由5项基本条件和22项考核指标组成;生态市标准由5顶基本条件和30项考核指标组成;生态县标准由5项基本条件和38项考核指标组成。适用于不同规模、不同区域生态省、市、县建设的标准,同时也可以做为引导生态省、市、县建设的方向和目标。 相似文献
112.
113.
Evaluate the performance of a stochastic-flow network with cost attribute in terms of minimal cuts 总被引:2,自引:0,他引:2
This paper proposes a performance index to measure the quality level of a stochastic-flow network in which each node has a designated capacity, which will have different lower levels due to various partial and complete failures. The performance index is the probability that the maximum flow of the network equals the demand d without exceeding the budget b. A simple algorithm in terms of minimal cuts is first proposed to generate all upper boundary points for (d, b), and then the probability that the maximum flow is less than or equal to d can be calculated in terms of such points. The upper boundary point for (d, b) is a maximal vector representing the capacity of each arc such that the maximum flow of the network under the budget b is d. The performance index can be calculated by repeating the proposed algorithm to obtain all upper boundary point for (d−1, b). A benchmark example is shown to illustrate the solution procedure. 相似文献
114.
文章从居住社区的规划设计和建筑设计两方面以低能耗的角度分析了城市居住功能的分布、社区住宅建筑布局的合理性、社区景观设置的合理性以及停车、中水处理与被动式太阳能住宅建筑的相关先进生态理念,希望通过居住社区的生态可持续性设计改善社区的舒适性和能源的可持续性. 相似文献
115.
本文给出了自给能γ剂量计探头在γ射线照射下积累电荷的测量结果,讨论了电容比和方向性对自给能γ剂量计探头的影响以及探头的饱和点。 相似文献
116.
Experimental measurements and full-2D numerical simulations show that velocity saturation effects in polysilicon thin-film transistor (TFTs) cannot be neglected in order to obtain a precise modelling of output characteristics. Since full-2D numerical simulations are time consuming and unpractical for circuit simulations, we have developed a new quasi-2D model, that takes into account both velocity saturation effects and the presence of a longitudinal electric field in the Poisson's equation, and includes the effect of parasitic bipolar transistor (PBT) action to reproduce kink effect. The agreement of the quasi-2D model with experimental data from p-channel polysilicon TFTs is very satisfactory even for short channel device, and the presence of a velocity-saturated region with a nearly constant free carrier concentration is reproduced without introducing further assumptions. 相似文献
117.
118.
Francesco Sarti Yaacov ArkinJean Chorowicz Arnon KarnieliTeresa Cunha 《Remote sensing of environment》2003,86(2):141-149
Differential radar interferometry, using archived ERS data over the region of the Dead Sea Transform, allows to detect ground movement (subsidence or uplift) in playas within the southern Arava Valley segment of the Dead Sea Rift. These measurements are consistent with a mean displacement rate of about 0.4 cm/month, in the direction of the radar beam, during the 8-month period preceding the Nuweiba earthquake of 22 November 1995. In the 3 years following the earthquake, the measured rate was smaller by a factor of 10. These movements are not related to salt diapirs or water pumping activities in the area. The exact location, along faults, suggests a possible correlation with pre-seismic and post-seismic fault deformation.A simple fault model consistent with the observed phenomena associates the observed subsidence/uplift to right and left stepping en-echelon fault patterns related to inter-seismic tensional accumulation along the faults. Further observations are necessary on this site and similar fault areas to corroborate the correlation between seismic activity and the observed phenomena. Monitoring of these sites should continue with differential Global positioning system (GPS) measurements and radar interferometric analysis using Envisat and Radarsat as well as archived data (including J-ERS). 相似文献
119.
In this work, we co‐formulated an oil‐borne copper naphthenate/permethrin wood preservative system with synthetic polymer‐based fire‐retardant additives prior to the impregnation of Pinus radiata sapwood. We evaluated what effect, if any, the preservative had upon the fire performance properties of the fire retardants and whether the fire retardants impacted on the fungicidal and termiticidal efficacy of the preservative. The fire retardants included halogenated and phosphorus‐based systems. A mass loss calorimeter, in conjunction with a thermopile, was used to measure the time to ignition and the peak heat release rate (PHRR) from which the fire performance index (FPI) was determined. The preservative properties were evaluated using termite and soil‐block decay bioassays. In summary, we found that the rate of fire growth was reduced when the fire retardants were used in combination with the wood preservative. We also found that the PHRR was a better determinant of fire performance than the FPI. The performance of the wood preservative was enhanced against fungal decay and termite attack when used in combination with the fire retardants. The fire retardants also demonstrated some wood preservative properties of their own. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
120.
本文讨论静载荷及疲劳载荷作用下 C/Al 正交层压板的力学响应,并考虑损伤过程中的临界现象,以此作为结构设计准则的基础。对静载荷作用的情况:(1)90°铺层的门槛应变ε_(FPF)随着约束程度增加而增加,而且开裂后的行为也受约束程度的影响。(2)经历加载-卸载再重新加载至断裂的过程后,初始试样存在一个剩余永久变形,其损伤状态可以用刚度的变化来表征;而疲劳试样在加载-卸载过程中刚度变化很小,反映其损伤达到一个稳定的状态。对疲劳载荷作用的情况:(1)对于给定的应力比 R,试样会趋于与它所承受的 S_(max)最大值相应的 SDS 状态。循环应力范围的不断增大,会引起基体损伤的增加,从而重新建立新的饱和损伤状态。(2)对于每一损伤状态均有一对应的循环应变范围 Δε。在 SDS 状态下,Δε保持不变。(3)以刚度下降为损伤参数对 C/Al 层压板进行了降级应力分析,并由此来预计在ΔS_(sh)以下,层压板不会发生疲劳损伤累积。 相似文献