全文获取类型
收费全文 | 2831篇 |
免费 | 279篇 |
国内免费 | 242篇 |
专业分类
电工技术 | 204篇 |
综合类 | 294篇 |
化学工业 | 216篇 |
金属工艺 | 203篇 |
机械仪表 | 208篇 |
建筑科学 | 181篇 |
矿业工程 | 98篇 |
能源动力 | 101篇 |
轻工业 | 85篇 |
水利工程 | 172篇 |
石油天然气 | 596篇 |
武器工业 | 16篇 |
无线电 | 288篇 |
一般工业技术 | 288篇 |
冶金工业 | 60篇 |
原子能技术 | 26篇 |
自动化技术 | 316篇 |
出版年
2024年 | 2篇 |
2023年 | 26篇 |
2022年 | 71篇 |
2021年 | 106篇 |
2020年 | 85篇 |
2019年 | 88篇 |
2018年 | 53篇 |
2017年 | 111篇 |
2016年 | 100篇 |
2015年 | 127篇 |
2014年 | 199篇 |
2013年 | 209篇 |
2012年 | 222篇 |
2011年 | 233篇 |
2010年 | 163篇 |
2009年 | 160篇 |
2008年 | 156篇 |
2007年 | 179篇 |
2006年 | 180篇 |
2005年 | 153篇 |
2004年 | 107篇 |
2003年 | 127篇 |
2002年 | 85篇 |
2001年 | 62篇 |
2000年 | 59篇 |
1999年 | 53篇 |
1998年 | 38篇 |
1997年 | 31篇 |
1996年 | 22篇 |
1995年 | 36篇 |
1994年 | 30篇 |
1993年 | 12篇 |
1992年 | 15篇 |
1991年 | 7篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1959年 | 2篇 |
排序方式: 共有3352条查询结果,搜索用时 21 毫秒
1.
2.
Abiodun B. Ogbesejana Zhong Ningning Oluwadayo O. Sonibare 《Petroleum Science and Technology》2019,37(18):1969-1977
The occurrence and distributions of dibenzofurans (DBFs) and benzo[b]naphthofurans were investigated in crude oils from Niger Delta, Nigeria, by gas chromatography-mass spectrometry-mass spectrometry. The distribution of DBFs was characterized by the predominance of C2-dibenzofurans. 4-Methyldibenzofuran was the most abundant among the methyldibenzofurans isomers while dimethyldibenzofuran-2 (DMDBF-2), ethyldibenzofuran-1, DMDBF-3, and DMDBF-6 occurred in higher amounts when compared with other DMDBFs. Among the benzonaphthofurans, the abundance of benzo[b]naphtho[2,1-d]furan was higher than other isomers. The DBFs distributions in the oils were not affected by source facies and depositional environments. However, the DBFs concentrations increased with increasing maturity in oils from ADL and MJO oilfields. 相似文献
3.
The flame front deformation instability of low-velocity filtration combustion within an inert packed bed is studied based on the initial preheating non-uniformity. Based on the experimental phenomena, an initial thermal perturbation model is numerically proposed so as to predict the deformation behaviors of the flame front instabilities. The numerical prediction indicates that the assumption of an initial thermal perturbation is a feasible explanation as the cause of the flame front inclination instability. As the initial thermal perturbation increases, the phenomena of the flame front break and shrinking instabilities could easily occur at high filtration velocity or low equivalence ratio. Moreover, the evolutions of the flame front break rate and the shrinking rate are quantitatively analyzed. 相似文献
4.
泌阳凹陷新庄辫状三角洲沉积体系及储集性能 总被引:3,自引:0,他引:3
依据岩心和测井资料,对泌阳凹陷新庄辫状三角洲沉积体系进行了沉积微相划分和微相特征分析。在此基础上,进行了沉积模式和油气储集性能的研究。研究认为,水下分流河道、河口砂坝是该区最好的油气储集体,其它微相依次为辫状河道、浊积岩、前缘席状砂和决口扇。研究结果可为下一步的滚动勘探提供地质依据。 相似文献
5.
The accurate prediction of the propagation of a wetting front in an unsaturated soil subjected to surficial infiltration is of practical importance to many geotechnical and geoenvironmental problems. The finite element method is the most common solution technique as the hydraulic soil properties are highly nonlinear. Two important issues are often found to create difficulties in such analyses. First, numerical oscillations are usually observed in the calculated pore pressures at the wetting front. Second, when a reasonable mesh size and time step are used, the elevation of the wetting front may be seriously overpredicted. This paper is focused on the second issue. The under-relaxation (UR) technique used in the iterative process within each time step is found to have a serious impact on rate of convergence with refinement in mesh size and time step. Two different techniques are typically used; the first evaluates the hydraulic conductivity using an average of heads calculated from the preceding time node and the most recent iteration of the current time node (UR1), and the second evaluates the hydraulic conductivity using the average of heads calculated from the two most recent iterations of the current time nodes (UR2). The study shows that UR1, which is adopted in programs such as SEEP/W, ensures that the solution converges rapidly to a stable solution within a time step, but may converge to the wrong wetting front at a given elapsed time unless a sufficiently refined mesh is used. UR2 converges much more slowly within a time step, but the error in the wetting front is smaller than that generated by UR1. 相似文献
6.
7.
8.
AutoCAD 下非结构网格自动生成 总被引:1,自引:1,他引:0
在AutoCAD环境下,从背景网格生成和数据结构两方面对推进阵面法进行修正。采用修理后的方法,使得在流场、泥沙输移和床面冲淤数值计算的前处理过程中无须精心预设内部控制点而只需给边界一个尺度,就能自动生成适应任意复杂边界的非结构网格,从而提高网格生成、优化的效率和通用性。 相似文献
9.
10.
分频解释技术在川西砂岩储层预测中的应用 总被引:20,自引:10,他引:10
分频解释技术是沿着储层或固定时窗对地震反射波各频率成分对应的调谐能量进行识别和成像,它避免了常规属性分析方法中的调谐陷阱,提高了识别薄储层的能力,能更客观地刻画地质体.在川西地区陆相隐蔽岩性气藏勘探中,存在调谐陷阱、波阻抗特征不明显、复杂地层结构中的有效薄储层不易识别等问题.为此,利用分频解释技术对川西地区侏罗系千佛崖组冲积扇相砾岩储层、上三叠统须四段河流三角洲相砂岩储层进行了描述.在多频率振幅叠加图上,冲积扇、三角洲水下分流河道等地质体形态和边界反映清晰;在单频振幅图上,清楚地显示出冲积扇内的辫状河道相薄层砾岩储层,与钻井结果相吻合,提高了储层预测精度. 相似文献