全文获取类型
收费全文 | 1231篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学工业 | 7篇 |
金属工艺 | 1篇 |
机械仪表 | 6篇 |
轻工业 | 9篇 |
水利工程 | 2篇 |
无线电 | 3篇 |
一般工业技术 | 9篇 |
冶金工业 | 1187篇 |
自动化技术 | 8篇 |
出版年
2023年 | 1篇 |
2019年 | 1篇 |
2014年 | 1篇 |
2013年 | 15篇 |
2012年 | 2篇 |
2011年 | 1篇 |
2009年 | 2篇 |
2007年 | 2篇 |
2006年 | 5篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 29篇 |
1998年 | 377篇 |
1997年 | 186篇 |
1996年 | 127篇 |
1995年 | 80篇 |
1994年 | 69篇 |
1993年 | 70篇 |
1992年 | 9篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 19篇 |
1988年 | 18篇 |
1987年 | 6篇 |
1986年 | 17篇 |
1985年 | 11篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 8篇 |
1980年 | 13篇 |
1978年 | 4篇 |
1977年 | 21篇 |
1976年 | 77篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1960年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1232条查询结果,搜索用时 73 毫秒
1.
STANISŁAW K. DUDA 《International journal of control》2013,86(5):1387-1399
This paper presents a new theory for determining dynamic output feedback of the least order for a linear, time-invariant, controllable and observable SIMO system, such that poles of the closed-loop system lie in a given region Γ in the complex plane. When some poles have prespecified stationary locations in the complex plane, dynamic output feedback is obtained in the sense that the remaining poles lie in Γ This theory applies to continuous-time as well as discrete-time systems. Here a design algorithm for complete system realization and an illustrative example are given. 相似文献
2.
3.
AW AD R. MANSOUR 《Chemical Engineering Communications》2013,200(1):133-135
Mixing in co-rotating sinusoidal cavity flows is studied with period, T, and phase shift, a, as parameters. Notice that the main obstacle to uniform mixing is the existence of stable :ower periodic orbits, mixing windows, where uniform mixing takes place, are found in the T— a space u:iing bifurcation analysis. The main advantage of this method is a great saving of the computation time. 相似文献
4.
STANISŁAW OSOWSKI 《International Journal of Electronics》2013,100(3):591-598
The analysis and synthesis are presented of a non-linear ladder network with diodes incorporated in the series branches. An explicit form of solution is proposed and then applied to the synthesis of piecewise-linear characteristics. An illustrative example is given. 相似文献
5.
AK Metzger G Mohapatra YA Minn AW Bollen K Lamborn FM Waldman CB Wilson BG Feuerstein 《Canadian Metallurgical Quarterly》1999,90(2):306-314
OBJECT: This study was conducted to determine whether comparative genomic hybridization (CGH) is a more sensitive method for detecting genetic aberrations than other tests currently in use. METHODS: The authors used CGH to examine 40 primary and 13 recurrent adenomas obtained from 52 patients for loss and gain of genetic material. Copy number aberrations (CNAs) were detected in 25 (48%) of the 52 patients studied. The chromosomes affected were, in order of decreasing frequency, 11, 7, X, 1, 8, 13, 5, 14, 2, 6, 9, 10, 12, 3, 18, 21, 4, 16, 15, 19, 22, and Y. Endocrinologically active adenomas were more likely to contain (p = 0.009) and had a greater number (p = 0.003) of CNAs. Of 26 adenomas with CNAs, 18 showed multiple aberrations involving entire chromosomes or chromosome arms. The most frequent CNA involving a chromosome subregion, which was present in four (8%) of 53 adenomas, was the loss of all chromosome 11 material except for a preserved common segment containing 11q13. Immunoperoxidase staining did not detect cyclin D1 expression in those four cases, making cyclin D1 an unlikely target of this rearrangement. CONCLUSIONS: These findings indicate that genetic abnormalities are present in pituitary adenomas at a higher rate than previously reported, are associated with endocrinological activity, and often involve several chromosomes. Rearrangement at 11q13 may inactivate a tumor suppressor gene or activate an oncogene that is important in the initiation or progression of sporadic pituitary adenomas. 相似文献
6.
7.
8.
9.
10.