全文获取类型
收费全文 | 108篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
化学 | 26篇 |
力学 | 3篇 |
数学 | 61篇 |
物理学 | 23篇 |
出版年
2021年 | 2篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 6篇 |
2012年 | 3篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 10篇 |
2008年 | 11篇 |
2007年 | 3篇 |
2006年 | 11篇 |
2005年 | 4篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1963年 | 2篇 |
1962年 | 1篇 |
1961年 | 2篇 |
1954年 | 2篇 |
排序方式: 共有113条查询结果,搜索用时 859 毫秒
71.
72.
Zvonimir Janko 《Archiv der Mathematik》2011,96(2):105-107
We give here a complete classification of the title groups (Theorem A). 相似文献
73.
74.
Zvonimir Janko 《Mathematische Zeitschrift》2006,253(2):419-420
In this note we determine finite nonabelian 2-groups G all of whose nonabelian subgroups are generated by involutions and show that such groups must be quasi-dihedral. This solves
the problem Nr. 1595 for p = 2 in [1]. 相似文献
75.
Zvonimir Janko 《Israel Journal of Mathematics》2006,154(1):157-184
We present an elementary proof of the classification theorem for finite nonmodular quaternion-free 2-groups. This proof does
not involve the structure theory of powerful 2-groups. Such a new proof is also necessary, since there are several gaps in
the original proof given in [5]. 相似文献
76.
Finite 2-groups with exactly one nonmetacyclic maximal subgroup 总被引:1,自引:1,他引:0
Zvonimir Janko 《Israel Journal of Mathematics》2008,166(1):313-347
We determine here the structure of the title groups. All such groups G will be given in terms of generators and relations, and many important subgroups of these groups will be described. Let d(G) be the minimal number of generators of G. We have here d(G) ≤ 3 and if d(G) = 3, then G′ is elementary abelian of order at most 4. Suppose d(G) = 2. Then G′ is abelian of rank ≤ 2 and G/G′ is abelian of type (2, 2m), m ≥ 2. If G′ has no cyclic subgroup of index 2, then m = 2. If G′ is noncyclic and G/Φ(G 0) has no normal elementary abelian subgroup of order 8, then G′ has a cyclic subgroup of index 2 and m = 2. But the most important result is that for all such groups (with d(G) = 2) we have G = AB, for suitable cyclic subgroups A and B. Conversely, if G = AB is a finite nonmetacyclic 2-group, where A and B are cyclic, then G has exactly one nonmetacyclic maximal subgroup. Hence, in this paper the nonmetacyclic 2-groups which are products of two cyclic subgroups are completely determined. This solves a long-standing problem studied from 1953 to 1956 by B. Huppert, N. Itô and A. Ohara. Note that if G = AB is a finite p-group, p > 2, where A and B are cyclic, then G is necessarily metacyclic (Huppert [4]). Hence, we have solved here problem Nr. 776 from Berkovich [1]. 相似文献
77.
78.
79.
This paper presents the stable isotope data of oxygen (δ18O) and hydrogen (δ2H) in groundwater from 83 sampling locations in Slovenia and their interpretation. The isotopic composition of water was monitored over 3 years (2009–2011), and each location was sampled twice. New findings on the isotopic composition of sampled groundwater are presented, and the data are also compared to past studies regarding the isotopic composition of precipitation, surface water, and groundwater in Slovenia. This study comprises: (1) the general characteristics of the isotopic composition of oxygen and hydrogen in groundwater in Slovenia, (2) the spatial distribution of oxygen isotope composition (δ18O) and d-excess in groundwater, (3) the groundwater isotope altitude effect, (4) the correlation between groundwater d-excess and the recharge area altitude of the sampling location, (5) the relation between hydrogen and oxygen isotopes in groundwater in comparison to the global precipitation isotope data, (6) the groundwater isotope effect of distance from the sea, and (7) the estimated relation between the mean temperature of recharge area and δ18O in groundwater. 相似文献
80.
Janko Marovt 《Linear and Multilinear Algebra》2013,61(9):1707-1723