全文获取类型
收费全文 | 44778篇 |
免费 | 1142篇 |
国内免费 | 5958篇 |
专业分类
电工技术 | 3811篇 |
综合类 | 5906篇 |
化学工业 | 3808篇 |
金属工艺 | 6189篇 |
机械仪表 | 2487篇 |
建筑科学 | 2326篇 |
矿业工程 | 1128篇 |
能源动力 | 807篇 |
轻工业 | 3626篇 |
水利工程 | 1144篇 |
石油天然气 | 5031篇 |
武器工业 | 361篇 |
无线电 | 4330篇 |
一般工业技术 | 3116篇 |
冶金工业 | 1486篇 |
原子能技术 | 1553篇 |
自动化技术 | 4769篇 |
出版年
2022年 | 41篇 |
2021年 | 53篇 |
2020年 | 64篇 |
2019年 | 48篇 |
2018年 | 60篇 |
2017年 | 162篇 |
2016年 | 157篇 |
2015年 | 171篇 |
2014年 | 978篇 |
2013年 | 809篇 |
2012年 | 1267篇 |
2011年 | 5671篇 |
2010年 | 2616篇 |
2009年 | 1632篇 |
2008年 | 1540篇 |
2007年 | 1154篇 |
2006年 | 1411篇 |
2005年 | 1739篇 |
2004年 | 5984篇 |
2003年 | 3489篇 |
2002年 | 3281篇 |
2001年 | 2092篇 |
2000年 | 1305篇 |
1999年 | 2210篇 |
1998年 | 1497篇 |
1997年 | 1497篇 |
1996年 | 790篇 |
1995年 | 634篇 |
1994年 | 526篇 |
1993年 | 2138篇 |
1992年 | 1664篇 |
1991年 | 1148篇 |
1990年 | 1119篇 |
1989年 | 849篇 |
1988年 | 569篇 |
1987年 | 319篇 |
1986年 | 243篇 |
1985年 | 124篇 |
1984年 | 93篇 |
1983年 | 54篇 |
1982年 | 55篇 |
1981年 | 50篇 |
1980年 | 82篇 |
1979年 | 70篇 |
1977年 | 23篇 |
1965年 | 66篇 |
1963年 | 25篇 |
1959年 | 27篇 |
1958年 | 26篇 |
1957年 | 33篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Rapid synthesis of silver nanowires(Ag NWs) with high quality and a broad processing window is challenging because of the low selectivity of the formation of multiply twinned particles at the nucleation stage for subsequent Ag NWs growth.Herein we report a systematic study of the water-involved heterogeneous nucleation of Ag NWs with high rate(less than 20 min) in a simple and scalable preparation method.Using glycerol as a reducing agent and a solvent with a high boiling point,the reaction is rapidly heated to 210 ℃ in air to synthesize Ag NWs with a very high yield in gram level.It is noted that the addition of a small dose of water plays a key role for obtaining highly pure Ag NWs in high yield,and the optimal water/glycerol ratio is0.25%.After investigating a series of forming factors including reaction temperature and dose of catalysts,the formation kinetics and mechanism of the Ag NWs are proposed.Compared to other preparation methods,our strategy is simple and reproducible.These Ag NWs show a strong Raman enhancement effect for organic molecules on their surface. 相似文献
2.
Matthew O'Sullivan Daire
hUallachin Patrícia Oliveira Antunes Eleanor Jennings Mary Kelly‐Quinn 《河流研究与利用》2019,35(2):146-158
Cattle access to streams has been linked globally with degradation of stream water quality, driven largely by bank erosion and resultant instream, fine sediment deposition. The majority of evidence on such effects is however based in arid and semiarid regions of the United States and Australia, with few studies relating to cool temperate climates such as Northwest Europe. In this study, “Quorer” resuspendable sediment samples were taken from riffle geomorphic units upstream (control) and at two points downstream (pressure and recovery) of cattle access points in headwater streams in agricultural catchments in Ireland to assess levels of deposited stream sediment. Samples were taken in April/May (2016) prior to the grazing season and in October (2016) at the end of the grazing season. Sites in good‐high ecological status catchments and less than good ecological status catchments were included in the study. Higher levels of sediment were found downstream of cattle access points in both good‐high status and less than good status catchments; however, the impacts of access points were spatially confined to, in most cases, the area immediately downstream of the point of access. There was a strong correlation between deposited sediment mass and organic matter (OM) mass, with levels of OM increasing linearly with deposited sediment mass. Levels of measured sediment were negatively correlated with riparian habitat health (measured using a qualitative habitat assessment). The results of this study highlight the need for measures to prevent cattle access to headwater streams where access points can be many in order to manage local habitat quality and downstream water quality issues. 相似文献
3.
Nathan M. Wilbur Antin M. O'Sullivan Kerry T. B. MacQuarrie Tommi Linnansaari R. Allen Curry 《河流研究与利用》2020,36(5):769-783
Anthropogenic influences, including climate change, are increasing river temperatures in northern and temperate regions and threatening the thermal habitats of native salmonids. When river temperatures exceed the tolerance levels of brook trout and Atlantic salmon, individuals exhibit behavioural thermoregulation by seeking out cold‐water refugia – often created by tributaries and groundwater discharge. Thermal infrared (TIR) imagery was used to map cold‐water anomalies along a 53 km reach of the Cains River, New Brunswick. Trout and salmon parr did not use all identified thermal anomalies as refugia during higher river temperature periods (>21°C). Most small‐bodied trout (8–30 cm) were observed in 80% of the thermal anomalies sampled. Large‐bodied trout (>35 cm) required a more specific set of physical habitat conditions for suitable refugia, that is, 100% of observed large trout used 30% of the anomalies sampled and required water depths >65 cm within or adjacent to the anomaly. Densities of trout were significantly higher within anomalies compared with areas of ambient river temperature. Salmon parr were less aligned with thermal anomalies at the observed temperatures, that is, 59% were found in 65% of the sampled anomalies; and densities were not significantly different within/ outside anomalies. Salmon parr appeared to aggregate at 27°C, and after several events over 27°C variability in aggregation behaviour was observed – some fish aggregated at 25°C, others did not. We stipulate this is due to variances of thermal fatigue. Habitat suitability curves were developed for velocity, temperature, depth, substrate, and deep water availability to characterize conditions preferred by fish during high‐temperature events. These findings are useful for managers as our climate warms, and can potentially be used as a tool to help conserve and enhance thermal refugia for brook trout and Atlantic salmon in similar systems. 相似文献
4.
番禺30-1砂岩强水驱气藏储层非均质性研究 总被引:7,自引:5,他引:2
针对垂向非均质性严重且边底水能量强的番禺30-1气田面临的潜在开发问题,通过岩心分析及测井二次解释,对其夹层特征及储层非均质性等进行了研究,划分出19个流动单元并定量描述了各流动单元的特征参数,建立了该气田的精细地质模型。综合评价表明,新建的地质模型具有较高的精度,为该气藏合理开发提供了坚实的地质基础。 相似文献
5.
涡轮搅拌桨反应器混合过程的数值计算 总被引:1,自引:1,他引:0
利用CFD方法计算单层涡轮反应器搅拌槽内流体混合过程的速度场和浓度场,研究物料在搅拌槽内的混合过程,以及不同监测点对混合时间的影响。结果表明,搅拌槽内物料的混合主要受槽内流体的流动形式所影响;混合时间的长短与监测点位置有关;在搅拌桨的桨叶附近进行监测所得到的混合时间较短,在液面附近进行监测所得的混合时间较长。在实际生产和试验中,应注意对监测点位置的选取。 相似文献
6.
主要对各国3G许可证与使用技术标准的抽绑政策.各国对2G/3G网络漫游的管制规定。以及3G网络之间共享的种类及实施方式等方面做了详尽的讲解,并进行比较和分析。 相似文献
7.
农村通信如何"突围" 总被引:2,自引:0,他引:2
农村通信作为农村地区信息化的基础,对于全面建设小康具有特殊的重要地位。介绍了我国农村通信的发展现状,分析了农村通信发展的困难压其原因,最后对农村压边远、欠发达地区通信的均衡震展提出了一些建议。 相似文献
8.
为获得金属表面特别是高副接触金属表面含自润滑特性且具有高硬度耐磨特性的功能材料 ,研究了 45 # 钢表面激光合金化氮化硅 /石墨复合涂层的工艺方法、组织特征、界面形态及其形成机制 ,利用光学显微镜、扫描电镜和X射线能谱对所形成合金化层的元素分布和含量进行了分析 ,并对试样硬度进行了测定。结果表明 ,合金化层中元素Fe ,Co ,Si,C分布均匀 ;C含量达到了 15 6 9%,大部分以石墨的形式存在 ,具有一定的自润滑性能 ;但在形成合金化层的温度条件下 ,氮化硅分解严重 ;合金化层硬度提高的主要原因是Si Fe ,Co Fe固溶体的强化作用及高碳马氏体的生成和高硬度碳化物的存在。 相似文献
9.
10.