全文获取类型
收费全文 | 2025篇 |
免费 | 150篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 14篇 |
化学工业 | 515篇 |
金属工艺 | 61篇 |
机械仪表 | 68篇 |
建筑科学 | 94篇 |
矿业工程 | 7篇 |
能源动力 | 182篇 |
轻工业 | 363篇 |
水利工程 | 12篇 |
石油天然气 | 16篇 |
无线电 | 77篇 |
一般工业技术 | 388篇 |
冶金工业 | 41篇 |
原子能技术 | 13篇 |
自动化技术 | 325篇 |
出版年
2024年 | 14篇 |
2023年 | 23篇 |
2022年 | 48篇 |
2021年 | 83篇 |
2020年 | 71篇 |
2019年 | 61篇 |
2018年 | 127篇 |
2017年 | 110篇 |
2016年 | 118篇 |
2015年 | 83篇 |
2014年 | 123篇 |
2013年 | 306篇 |
2012年 | 102篇 |
2011年 | 127篇 |
2010年 | 152篇 |
2009年 | 115篇 |
2008年 | 103篇 |
2007年 | 104篇 |
2006年 | 46篇 |
2005年 | 30篇 |
2004年 | 30篇 |
2003年 | 16篇 |
2002年 | 25篇 |
2001年 | 15篇 |
2000年 | 13篇 |
1999年 | 9篇 |
1998年 | 11篇 |
1997年 | 6篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 11篇 |
1984年 | 9篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 13篇 |
1980年 | 6篇 |
1978年 | 2篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有2176条查询结果,搜索用时 15 毫秒
1.
2.
3.
Some picture fuzzy Bonferroni mean operators with their application to multicriteria decision making
In this paper, we extend the Bonferroni mean (BM) operator with the picture fuzzy numbers (PFNs) to propose novel picture fuzzy aggregation operators and demonstrate their application to multicriteria decision making (MCDM). On the basis of the algebraic operational rules of PFNs and BM, we introduce some aggregation operators: the picture fuzzy Bonferroni mean, the picture fuzzy normalized weighted Bonferroni mean, and the picture fuzzy ordered weighted Bonferroni mean. Then, a new picture fuzzy MCDM method is proposed with the help of the proposed operators. Lastly, a practical application of proposed model is given to verify the developed model and related results of the proposed model is compared with the results of the existing models to indicate its applicability. 相似文献
4.
5.
6.
7.
Physically based simulation of human hair is a well studied and well known problem. But the “pure” physically based representation of hair (and other animation elements) is not the only concern of the animators, who want to “control” the creation and animation phases of the content. This paper describes a sketch-based tool, with which a user can both create hair models with different styling parameters and produce animations of these created hair models using physically and key frame-based techniques. The model creation and animation production tasks are all performed with direct manipulation techniques in real-time. 相似文献
8.
In this study forecast of Turkey's net electricity energy consumption on sectoral basis until 2020 is explored. Artificial neural networks (ANN) is preferred as forecasting tool. The reasons behind choosing ANN are the ability of ANN to forecast future values of more than one variable at the same time and to model the nonlinear relation in the data structure. Founded forecast results by ANN are compared with official forecasts. 相似文献
9.
M.D. Mikhailov M.N. Özişik 《International Communications in Heat and Mass Transfer》1985,12(4):393-404
A new, powerful method of analysis, involving the combined use of finite integral transform and finite element techniques, is presented for the solution of time dependent heat flow systems composed of many one-dimensional elements connected through the nodes. This method leads to an eigenvalue problem which is not of the conventional Sturm-Liouville type. A procedure for the determination of the eigenvalues is described. The solution obtained is in the form of an infinite series and contains quasi-steady and transient terms. The general solution obtained can be applied in the mathematical modelling of many engineering applications such as the determination of the penetration of the daily temperature cycle into buildings, the analysis of heat transfer in array of extended surfaces in compact heat exchangers, and many others. 相似文献
10.
Ekrem Savaş 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2012,16(4):591-595
Quite recently, Sava? (Appl Math Lett 21:134–141, 2008), defined the lacunary statistical analogue for double sequence \(X=\{X_{k,l}\}\) of fuzzy numbers as follows: a double sequence \(X=\{X_{k,l}\}\) is said to be lacunary P-statistically convergent to \(X_{0}\) provided that for each \(\epsilon >0\) In this paper we introduce and study double lacunary \(\sigma\)-statistical convergence for sequence of fuzzy numbers and also we get some inclusion theorems.
相似文献
$ P-\lim_{r,s}\frac{1}{h_{r,s}}\left | \{(k,l)\in I_{r,s}: d(X_{k,l },X_0)\geq \epsilon\}\right|= 0. $