全文获取类型
收费全文 | 23839篇 |
免费 | 2903篇 |
国内免费 | 1565篇 |
专业分类
电工技术 | 2276篇 |
技术理论 | 2篇 |
综合类 | 2662篇 |
化学工业 | 1439篇 |
金属工艺 | 854篇 |
机械仪表 | 1631篇 |
建筑科学 | 1707篇 |
矿业工程 | 952篇 |
能源动力 | 791篇 |
轻工业 | 555篇 |
水利工程 | 1246篇 |
石油天然气 | 2176篇 |
武器工业 | 707篇 |
无线电 | 4512篇 |
一般工业技术 | 4166篇 |
冶金工业 | 434篇 |
原子能技术 | 370篇 |
自动化技术 | 1827篇 |
出版年
2024年 | 111篇 |
2023年 | 331篇 |
2022年 | 633篇 |
2021年 | 732篇 |
2020年 | 676篇 |
2019年 | 609篇 |
2018年 | 616篇 |
2017年 | 727篇 |
2016年 | 877篇 |
2015年 | 879篇 |
2014年 | 1335篇 |
2013年 | 1314篇 |
2012年 | 1638篇 |
2011年 | 1796篇 |
2010年 | 1377篇 |
2009年 | 1516篇 |
2008年 | 1284篇 |
2007年 | 1671篇 |
2006年 | 1652篇 |
2005年 | 1276篇 |
2004年 | 1070篇 |
2003年 | 1015篇 |
2002年 | 761篇 |
2001年 | 672篇 |
2000年 | 652篇 |
1999年 | 544篇 |
1998年 | 471篇 |
1997年 | 371篇 |
1996年 | 338篇 |
1995年 | 285篇 |
1994年 | 249篇 |
1993年 | 219篇 |
1992年 | 165篇 |
1991年 | 107篇 |
1990年 | 108篇 |
1989年 | 75篇 |
1988年 | 54篇 |
1987年 | 26篇 |
1986年 | 11篇 |
1985年 | 10篇 |
1984年 | 17篇 |
1983年 | 4篇 |
1982年 | 11篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 2篇 |
1976年 | 3篇 |
1973年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
利用短周期地脉动推断深层地基S波速度 总被引:3,自引:0,他引:3
从二维随机波场的相关理论出发,提出了如何从短周期地脉动(频率>0.5Hz)时域信号中计算Rayleigh波弥散曲线,进而反演深层地基剪切波(S波)速度的理论方法和分析技术,并结合实测信号的分析结果,探讨了该方法的可行性和实用性。 相似文献
33.
叠后地震剖面的线性化波阻抗反演 总被引:4,自引:0,他引:4
本文提出了由井旁道出发逐道进行的叠后地震剖面的线性化波阻抗反演方法。每一道反演采用逐次线性化对波阻抗进行修正,反演的纵向分辨率为一个采样时间间隔,并以合成记录道与实际地震道的相似系数作为迭代收敛准则,已处理的地震道波阻抗作为下一道反演初始值。实际资料处理表明,该方法具有较高的分辨率和运算速度快的优点。 相似文献
34.
振动采油工艺在稠油区的实验研究与应用 总被引:5,自引:2,他引:3
在天然地震的影响下,油井产量发生波动,使人们受到启示,从而引进了振动采油工艺技术。本文对振动增产的机理进行了探讨,指出振动增油机理在于加快地层中流体的流速;改变储集层内油、气、水的重新分布;改变岩石表面润湿性,有利于清除油层堵塞,提高渗透率。通过分析两个试验区的振动采油效果,总结出在不同扰动力、不同激振频率、不同振动周期下的增产效果和规律,对振动采油的实施具有一定的指导意义。 相似文献
35.
10000m^3天然气球罐用WEL—TEN610CF钢焊接冷裂纹敏感性 总被引:1,自引:1,他引:0
WEL-TEN610CF钢是日本新日铁公司生产的低裂纹敏感性高强钢,结合我国首台国产化10 000 m3天然气球罐用37 mm厚WEL-TEN610CF钢焊接性试验研究,对该钢焊接冷裂纹敏感性进行了综合评定,为其焊接工艺的制订提供了可靠的依据。 相似文献
36.
本文导出了线性波浪作用于上部可渗透的直立刚性圆柱体上的水动力的解析解。在线性有势流的假定下,用特征函数展开方法求出了内部和外部流场的解。给出了不同波浪要素及结构尺寸参数下的数值结果。由结果可知,提高可渗透性可以有效消减波幅。 相似文献
37.
Thomas M. Burton Craig A. Stricker Donald G. Uzarski 《Lakes & Reservoirs: Research and Management》2002,7(3):255-269
Invertebrate communities from different coastal marsh‐plant communities were compared along wave‐exposure gradients using data from 1994, 1998 and 1999. Data were subjected to correspondence analyses to search for patterns in invertebrate communities in relation to plant‐community structure and wave exposure. In 1994, quantitative plant‐ and sediment‐invertebrate samples were taken from nine habitats: four from inland, subsurface‐connected marshes and five from littoral, emergent marshes. In 1998, sweep‐net samples were taken from 13 plant communities: six on the exposed and seven on the protected side of an island. In 1999, 2–3 plant communities/sites were sampled with sweep nets from four sites around the Bay so that intersite differences between inner, less‐exposed and outer, more‐exposed habitats could be examined. In all three studies, correspondence analyses separated inland, protected or inner sites from littoral, exposed or outer sites, suggesting differences in invertebrate‐community structure. For example, Hydracarina and Asellidae occurred in large numbers in inland sites, but were less common or absent from exposed, littoral sites. Littoral marshes also separated along an exposure gradient with Tanytarsini and Orthocladiinae collectors of organic particles occurring in very high numbers in outer, exposed areas where organic particles from the pelagic zone entered the marsh. Certain plant‐community types clustered together (e.g. wet meadow and Scirpus) while others, such as Typha, stands clustered according to exposure to waves suggesting the importance of both plant‐community structure and wave exposure in determining invertebrate‐community structure. We present a conceptual model that suggests that invertebrates in Great Lakes' marshes are distributed along gradients of decreased mixing of pelagic water and increases in sediment organic matter from outer to inner marsh and between littoral and adjacent inland marshes. Some invertebrates do best on one end of these gradients, while the majority are generalists found across habitat types. 相似文献
38.
Meng Jun min Ocean University of Qingdao Qingdao China Zhang Zi li Zhao Jun sheng First Institute of Oceanography State Oceanic Administration Qingdao China Zhang Jie Key Laboratory of Marine Science Numerical Modelling 《水动力学研究与进展(B辑)》2001,(3)
1 . INTRODUCTIONOceaninternalwaveisakindofgravitywavegeneratedinthestratifiedocean .Itproducebytheinteractionoftidecurrentandtopography ,seaquakeandmovingshipwhenthestrong ,shallowpycnoclineis present.Theinternalwavesinthecontinentalshelfarealmosttideprod… 相似文献
39.
Shu-Chu Ren Nelson N. Hsu Donald G. Eitzen 《Journal of research of the National Institute of Standards and Technology》2002,107(5):445-473
Pulsed ultrasonic techniques can be and have been used to examine the interface conditions of a bonded structure. To provide a theoretical basis for such testing techniques we model the structure as a layer on top of a half-space, both of different elastic properties, with various interface bonding conditions. The exact dynamic Green’s tensor for such a structure is explicitly derived from the three-dimensional equations of motion. The final solution is a series. Each term of the series corresponds to a successive arrival of a “generalized ray” and each is a definite line integral along a fixed path which can be easily computed numerically. Willis’ method is used in the derivation. A new scheme of automatic generation of the arrivals and ray paths using combinatorial analysis, along with the summation of the corresponding products of reflection coefficients is presented. A FORTRAN code is developed for computation of the Green’s tensor when both the source and the detector are located on the top surface. The Green’s tensor is then used to simulate displacements due to pulsed ultrasonic point sources of known time waveform. Results show that the interface bonding conditions have a great influence on the transient displacements. For example, when the interface bonding conditions vary, some of the first few head waves and regular reflected rays change polarities and amplitudes. This phenomenon can be used to infer the quality of the interface bond of materials in ultrasonic nondestructive evaluation. In addition the results are useful in the study of acoustic microscopy probes, coatings, and geo-exploration. 相似文献
40.
本文在[1]的基础上,详尽地得到了Boussinesq方程和KdV方程的孤立波解,并对波高和波形进行了细致的分析。为了更好地比较,本文还给出了高阶摄动的孤立波解。 相似文献