全文获取类型
收费全文 | 4768篇 |
免费 | 189篇 |
国内免费 | 51篇 |
专业分类
电工技术 | 111篇 |
技术理论 | 2篇 |
综合类 | 322篇 |
化学工业 | 331篇 |
金属工艺 | 146篇 |
机械仪表 | 194篇 |
建筑科学 | 1681篇 |
矿业工程 | 254篇 |
能源动力 | 223篇 |
轻工业 | 255篇 |
水利工程 | 109篇 |
石油天然气 | 112篇 |
武器工业 | 11篇 |
无线电 | 212篇 |
一般工业技术 | 267篇 |
冶金工业 | 281篇 |
原子能技术 | 46篇 |
自动化技术 | 451篇 |
出版年
2024年 | 21篇 |
2023年 | 49篇 |
2022年 | 76篇 |
2021年 | 121篇 |
2020年 | 132篇 |
2019年 | 84篇 |
2018年 | 72篇 |
2017年 | 112篇 |
2016年 | 162篇 |
2015年 | 147篇 |
2014年 | 275篇 |
2013年 | 308篇 |
2012年 | 290篇 |
2011年 | 321篇 |
2010年 | 257篇 |
2009年 | 297篇 |
2008年 | 239篇 |
2007年 | 299篇 |
2006年 | 254篇 |
2005年 | 192篇 |
2004年 | 183篇 |
2003年 | 184篇 |
2002年 | 151篇 |
2001年 | 140篇 |
2000年 | 121篇 |
1999年 | 99篇 |
1998年 | 86篇 |
1997年 | 54篇 |
1996年 | 53篇 |
1995年 | 48篇 |
1994年 | 43篇 |
1993年 | 18篇 |
1992年 | 18篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1981年 | 10篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1958年 | 2篇 |
1955年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有5008条查询结果,搜索用时 15 毫秒
31.
在研究Ⅱ,Ⅲ型HARQ的基础上,提出了基于RCPC码的新型HARQ,并通过仿真得出不同信噪比下的最佳分块方案,以便使新型HARQ获得最佳性能。新型HARQ是将F个相同的分块穿孔后同时发送;在接收端,解穿孔后相同的分块进行分集合并。新型HARQ具有Ⅱ,Ⅲ型HARQ的优点,当信噪比较低时新型HARQ的通过率和平均重传次数接近于Ⅲ型HARQ;当信噪比较高时新型HARQ的通过率和平均重传次数接近于Ⅱ型HARQ。对Ⅱ,Ⅲ型和新型HARQ的性能进行理论分析和仿真,结果证明本文结论正确。 相似文献
32.
Dušan Barać Vanjica Ratković-Živanović Marijana Despotović-Zrakić Aleksandra Labus Zorica Bogdanović 《Telematics and Informatics》2017,34(1):20-29
This paper examines the possibilities of enhancing relationship management between public service broadcasters and their stakeholders by harnessing the potential of newest e-business technologies and concepts, such as: social media, digital and interactive TV, and mobile computing. In order to facilitate adoption of relationship management strategy, a framework for leveraging relationship management is proposed. Evaluation was performed within the e-business system of a public broadcaster. This empirical study explored the readiness and expected benefits of relationship management implementation. The research results have indicated that a public broadcaster could achieve a higher level of social responsibility, improve business sustainability, and empower communication and collaboration with all the stakeholders by using emerging technologies for relationship management activities. 相似文献
33.
详细分析了终端对话音业务和新业务的影响。在分析终端对话音业务的影响时从用户和终端两方面进行了阐述,指明为了进一步提高用户敷和砖络的使用率,运营商在进行话音营销对应逐渐将工作重点适当转向农村市场。也从对个人和行业用户的影响两方面阐明了终端对新业务的影响。 相似文献
34.
以抛物线为母线的偏轴旋转抛面天线可以在锥面上或平面上实现宽角域扫描,或形成多束波天线,但沿性面和垂直之间的中间平面,子波束孔径上光程差很大,导致天线性能降低,本文以新型母线取代抛物线,创立新型偏轴旋转反射面天线,使天线性能得到显著改善。 相似文献
35.
36.
37.
38.
该文设计了一种基于3种反射型单元共享孔径的新型宽带低RCS超表面反射屏,与传统人工磁导体反射屏相比,引入一种相量干涉单元,利用新型相位对消关系完成了对传统人工磁导体(AMC)反射屏相位对消频带的拓展。通过将3种反射单元交错排布,合理设计阵列使其满足新型相位对消条件,并进一步优化单元结构参数,实现了阵列RCS缩减和缩减带宽的拓展。在不同极化波垂直入射条件下,新型阵列均有较好的低散射性能。仿真与实测结果表明:在5.2~13.9 GHz范围内后向RCS缩减量达到10 dB以上,相对带宽达到91%,为宽带低RCS反射屏设计提供了新的方法。 相似文献
39.
Water with Cl concentrations from 15 to almost 10,000 mg/kg, and molecular SO4/Cl ratios ranging from 0.003 to 1.87, drips periodically from the roof of Ruatapu cave and a side chamber, Rahu Rahu, located in the Orakei Korako geothermal field, Taupo Volcanic Zone, New Zealand. Pools in the bottom of both Ruatapu and Rahu Rahu contain sulfate–chloride waters with pH values ranging from 2.5 to 3.0; their Cl contents have varied temporally from 120 to 240 mg/kg and their molecular SO4/Cl ratios from 0.86 to 1.30. The Cl in the water dripping from the cave roof cannot come directly from the alkali chloride–bicarbonate water that circulates in the reservoir at Orakei Korako since the modern and historic piezometric surfaces are several meters below the cave roof. Nor does all the Cl in the cave pool waters derive from the reservoir fluid as the volume input required is incompatible with their Na and K contents. A more likely source for the Cl is one whereby rain water, percolating through the fractured rhyolitic country rock, dissolves Cl present either in glass shards or halite deposited in prehistoric times when trapped alkali chloride water boiled to dryness. Given that Cl in the cave pool waters is therefore supplied from a source above rather than, as previously assumed, below, the axiom that Cl present in acid sulfate–chloride ± bicarbonate waters is necessarily a signature of a deep water or magmatic input needs qualification. 相似文献
40.
Simple modelling of the effects of exploitation on hot springs, Geyser Valley, Wairakei, New Zealand
Many hot springs in Geyser Valley declined and ceased flowing during well testing (1950–1958) or the early stages of development (1958–1964) of the Wairakei field, North Island, New Zealand. A simple model that considers mixing, geothermal reservoir pressure, and Darcy flow is applied to analyse the changes in flow rate and chemistry of spring SP18. The model suggests that prior to the testing the observed flow rate of 3 l/s was comprised of about 2.1 l/s of water from the deep reservoir and about 0.9 l/s from shallow groundwater. As the pressure in the reservoir decreased as a result of exploitation, the reservoir component declined but the groundwater component remained near constant until the spring had nearly ceased flowing. The model reasonably predicts the flow cessation date for four other springs (Group A) but poorly predicts that for seven other springs (Group B). These two groups of springs do not appear to be clustered at the ground surface. The pressure–elevation relationship suggests that the Group A springs feed from within the shallower Waiora Formation and Group B springs from within the deeper Wairakei Ignimbrite Formation. The observation that declines of chloride concentrations in Group A springs occurred at least three years before those in springs of Group B is consistent with the finding that Group A springs have a shallower feeder depth. 相似文献