全文获取类型
收费全文 | 1665篇 |
免费 | 114篇 |
国内免费 | 50篇 |
专业分类
电工技术 | 23篇 |
综合类 | 104篇 |
化学工业 | 275篇 |
金属工艺 | 139篇 |
机械仪表 | 114篇 |
建筑科学 | 327篇 |
矿业工程 | 47篇 |
能源动力 | 88篇 |
轻工业 | 72篇 |
水利工程 | 29篇 |
石油天然气 | 49篇 |
武器工业 | 7篇 |
无线电 | 95篇 |
一般工业技术 | 137篇 |
冶金工业 | 51篇 |
原子能技术 | 45篇 |
自动化技术 | 227篇 |
出版年
2024年 | 6篇 |
2023年 | 19篇 |
2022年 | 36篇 |
2021年 | 31篇 |
2020年 | 35篇 |
2019年 | 34篇 |
2018年 | 36篇 |
2017年 | 45篇 |
2016年 | 48篇 |
2015年 | 36篇 |
2014年 | 95篇 |
2013年 | 110篇 |
2012年 | 93篇 |
2011年 | 131篇 |
2010年 | 98篇 |
2009年 | 83篇 |
2008年 | 92篇 |
2007年 | 100篇 |
2006年 | 106篇 |
2005年 | 86篇 |
2004年 | 70篇 |
2003年 | 78篇 |
2002年 | 59篇 |
2001年 | 47篇 |
2000年 | 36篇 |
1999年 | 51篇 |
1998年 | 35篇 |
1997年 | 25篇 |
1996年 | 22篇 |
1995年 | 7篇 |
1994年 | 13篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 11篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 6篇 |
1985年 | 1篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 1篇 |
排序方式: 共有1829条查询结果,搜索用时 15 毫秒
61.
The viscous fingering instability of miscible shear‐thinning fluids has been examined using a pseudo‐spectral numerical technique based on the Hartley transform. The instability was studied for a flow in a rectilinear Hele‐Shaw cell, and the shear‐thinning character of the fluids has been modelied using the Carreau equation. New mechanisms of viscous fingering not previously observed in the case of similar Newtonian flow displacements have been identified. These mechanisms, which are reminiscent of the fractal patterns observed in experimental studies, were interpreted in terms of the velocity‐dependent mobility of the flow. 相似文献
62.
This contribution presents coupling of laws for shear flow and wall slipping by the shear stress at the slipping interface. It includes the special case of Coulombian friction postulated by Uhland as well as the assumption of a constant sliding velocity along the flow channel according to Mooney. As an example, Ostwald and de Waele's law of shear thinning flow is combined with a shear stress of sliding depending on internal pressure by a power law. Examined feedstocks for metal injection molding showed a rheological behavior according to the model presented. 相似文献
63.
Philip Yuan 《Architectural Design》2016,86(2):92-99
Philip Yuan , Founding Director of Shanghai-based firm Archi-Union Architects, applies parametric techniques to his design and research in China. Here he explains how Parametricism can provide a highly adaptive and open approach to architectural knowledge and spatial organisation, accommodating regional variations in culture and environment, through an emphasis on local climate, materials and craft traditions. 相似文献
64.
Characterization of extensional rheological filament stretching with a dual‐mode Giesekus model
下载免费PDF全文
![点击此处可从《American Institute of Chemical Engineers》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Bart Hallmark D. Ian Wilson Nicolas Pistre 《American Institute of Chemical Engineers》2016,62(6):2188-2199
A new, simple, formulation that describes capillary thinning as predicted by a two‐mode Giesekus model is derived, and its application in analyzing data from extensional rheometry (capillary thinning) experiments is discussed. An algorithm is presented that can be used to fit the expressions obtained from the Giesekus model to extensional rheometry data. Examples of data fitting are given for an idealized data set, for measurements obtained for aqueous solutions of 6 wt % 900,000 molecular weight polyethylene oxide, and for biological fluids obtained from pitchers of Nepenthes Rafflesiana. Good fits to the data were obtained, with coefficients of determination in excess of 0.98. For each data set, it was possible to calculate values of extensional viscosity and relaxation time for each of the two modes, allowing quantitative comparison of different fluids or of the same fluid as it ages. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2188–2199, 2016 相似文献
65.
66.
67.
68.
The parameters of integer autoregressive models with Poisson, or negative binomial innovations can be estimated by maximum likelihood where the prediction error decomposition, together with convolution methods, is used to write down the likelihood function. When a moving average component is introduced this is not the case. To address this problem an efficient method of moment estimator is proposed where the estimated standard errors for the parameters are obtained using subsampling methods. The small sample properties of the estimator are investigated using Monte Carlo methods, while the approach is demonstrated using two well‐known examples from the time series literature. 相似文献
69.
导弹壁温的准三维计算及红外辐射研究 总被引:2,自引:0,他引:2
建立了飞行中段导弹壁面的非稳态、准三维温度计算模型,并采用控制容积积分法求解得到不同时刻壁面温度的三维分布,研究了导弹表面辐射特性的计算方法。模型中考虑了气动加热、太阳和大气辐射、壁面内部导热系数变化对导弹壁面温度的影响,太阳和大气辐射对导弹表面辐射的影响。计算了某飞行中段导弹的壁温及光谱8~12μm内导弹红外辐射的空间分布并给出了相应的结果。 相似文献
70.