全文获取类型
收费全文 | 95篇 |
免费 | 3篇 |
专业分类
化学 | 33篇 |
晶体学 | 1篇 |
数学 | 62篇 |
物理学 | 2篇 |
出版年
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 3篇 |
2014年 | 1篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 4篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 4篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1966年 | 1篇 |
排序方式: 共有98条查询结果,搜索用时 15 毫秒
11.
12.
Ohne Zusammenfassung 相似文献
13.
14.
Wilfried Imrich Iztok Peterin Simon Špacapan Cun‐Quan Zhang 《Journal of Graph Theory》2010,64(4):267-276
We prove that the strong product G1? G2 of G1 and G2 is ?3‐flow contractible if and only if G1? G2 is not T? K2, where T is a tree (we call T? K2 a K4‐tree). It follows that G1? G2 admits an NZ 3 ‐flow unless G1? G2 is a K4 ‐tree. We also give a constructive proof that yields a polynomial algorithm whose output is an NZ 3‐flow if G1? G2 is not a K4 ‐tree, and an NZ 4‐flow otherwise. © 2009 Wiley Periodicals, Inc. J Graph Theory 64: 267–276, 2010 相似文献
15.
The antibandwidth problem consists of placing the vertices of a graph on a line in consecutive integer points in such a way that the minimum difference of adjacent vertices is maximised. The problem was originally introduced in [J.Y.-T. Leung, O. Vornberger, J.D. Witthoff, On some variants of the bandwidth minimisation problem, SIAM Journal of Computing 13 (1984) 650-667] in connection with the multiprocessor scheduling problems and can also be understood as a dual problem to the well-known bandwidth problem, as a special radiocolouring problem or as a variant of obnoxious facility location problems. The antibandwidth problem is NP-hard, there are a few classes of graphs with polynomial time complexities. Exact results for nontrivial graphs are very rare. Miller and Pritikin [Z. Miller, D. Pritikin, On the separation number of a graph, Networks 19 (1989) 651-666] showed tight bounds for the two-dimensional meshes and hypercubes. We solve the antibandwidth problem precisely for two-dimensional meshes, tori and estimate the antibandwidth value for hypercubes up to the third-order term. The cyclic antibandwidth problem is to embed an n-vertex graph into the cycle Cn, such that the minimum distance (measured in the cycle) of adjacent vertices is maximised. This is a natural extension of the antibandwidth problem or a dual problem to the cyclic bandwidth problem. We start investigating this invariant for typical graphs and prove basic facts and exact results for the same product graphs as for the antibandwidth. 相似文献
16.
Karel D. Klika Eva Balentov Kalevi Pihlaja Juraj Bernt Jn Imrich Martina Vavruov Erich Kleinpeter Andreas Koch 《Journal of heterocyclic chemistry》2006,43(3):633-643
17.
Karel D. Klika Kalevi Pihlaja Jn Imrich Mria Vilkov Juraj Bernt 《Journal of heterocyclic chemistry》2006,43(3):739-743
18.
19.
20.