全文获取类型
收费全文 | 1290篇 |
免费 | 57篇 |
国内免费 | 175篇 |
专业分类
化学 | 50篇 |
晶体学 | 2篇 |
力学 | 60篇 |
综合类 | 28篇 |
数学 | 1236篇 |
物理学 | 146篇 |
出版年
2024年 | 2篇 |
2023年 | 8篇 |
2022年 | 17篇 |
2021年 | 25篇 |
2020年 | 32篇 |
2019年 | 32篇 |
2018年 | 47篇 |
2017年 | 48篇 |
2016年 | 23篇 |
2015年 | 23篇 |
2014年 | 28篇 |
2013年 | 234篇 |
2012年 | 29篇 |
2011年 | 47篇 |
2010年 | 58篇 |
2009年 | 56篇 |
2008年 | 87篇 |
2007年 | 66篇 |
2006年 | 67篇 |
2005年 | 73篇 |
2004年 | 63篇 |
2003年 | 66篇 |
2002年 | 64篇 |
2001年 | 51篇 |
2000年 | 48篇 |
1999年 | 52篇 |
1998年 | 32篇 |
1997年 | 31篇 |
1996年 | 23篇 |
1995年 | 22篇 |
1994年 | 15篇 |
1993年 | 17篇 |
1992年 | 5篇 |
1991年 | 10篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1957年 | 1篇 |
排序方式: 共有1522条查询结果,搜索用时 390 毫秒
41.
Fernanda D. de Melo Hernández César A. Hernández Melo Horacio Tapia-Recillas 《代数通讯》2020,48(9):4013-4026
AbstractIn the present work, a procedure for determining idempotents of a commutative ring having a sequence of ideals with certain properties is presented. As an application of this procedure, idempotent elements of various commutative rings are determined. Several examples are included illustrating the main results. 相似文献
42.
Ideal optomechanically induced transparency generation in a cavity optoelectromechanical system 下载免费PDF全文
《中国物理 B》2021,30(10):104211-104211
The ideal optomechanically induced transparency effects of an output probe field are investigated in a cavity optoelectromechanical system, which is composed of an optical cavity, a charged mechanical resonator, and a charged object.Although the charged mechanical resonator damping rate is nonzero, the ideal optomechanically induced transparency can still appear due to the non-rotating wave approximation effect in the system. The location of optomechanically induced transparency dip can be controlled via the Coulomb coupling strength. In addition, we find that both the transparency window width and the maximum dispersion curve slope are closely related to the optical cavity decay rate. 相似文献
43.
应用基于逼近理想解排序法的区间三角模糊多属性决策模型,对三江平原六大分区地下水脆弱性进行了风险预警和评估.评估结果与前人吻合,可为有关决策部门采取相应降低环境风险的措施提供参考.实例验证表明,模型具有更高的计算精度和更好的评价效果,为有关环境风险决策部门对地下水风险预警和评估提供了新的思路和方法. 相似文献
44.
In this work,the entropy functions of ideal quantum gases in a three-dimensional harmonic trap are analytically calculated using temperature as an explicit variable.Afterward,the applicability of the analytical formulas is validated by comparison with the numerical calculation.The results illustrate that the obtained functions could be applied for the whole temperature regime with a maximum relative deviation of less than 7.5%in the vicinity of the critical temperature Tcin the case of Bose gases.Meanwhile,for Fermi gases,although the analytical formula fits well at very low-and high-temperature regimes,it cannot be applied at temperature in the range[0.3-0.5]T_F,where T_F is the Fermi temperature.In addition,the consistency between our formulas and classical ones at significantly high temperatures is also discussed. 相似文献
45.
46.
Let R be a prime ring, L a noncentral Lie ideal and σ a nontrivial automorphism of R such that usσ(u)ut= 0 for all u ∈ L, where s, t are fixed non-negative integers. If either char R s + t or char R = 0, then R satisfies s4, the standard identity in four variables. We also examine the identity(σ([x, y])-[x, y])n=0 for all x, y ∈ I, where I is a nonzero ideal of R and n is a fixed positive integer. If either char R n or char R = 0, then R is commutative. 相似文献
47.
48.
In this paper, we determine the structures of the transfer ideal and its radical ideal for the ring of polynomials F p[x, y] under the action of dihedral group D2 p in the modular case. We mainly use Transfer variety, p order elements, and Hilbert’s Nullstellensatz Theorem. 相似文献
49.
Abigail C. Bailey 《代数通讯》2017,45(6):2662-2672
We extend the definition of a piecewise Noetherian ring to the noncommutative case, and investigate various properties of such rings. In particular, we show that a ring with Krull dimension is piecewise Noetherian. Certain fully bounded piecewise Noetherian rings have Gabriel dimension and exhibit the Gabriel correspondence between prime ideals and indecomposable injective modules. 相似文献
50.
《Journal of Pure and Applied Algebra》2023,227(4):107256
We develop a duality for operations on nested pairs of modules that generalizes the duality between absolute interior operations and residual closure operations from [5], extending our previous results to the expanded context. We apply this duality in particular to integral and basically full closures and their respective cores to obtain integral and basically empty interiors and their respective hulls. We also dualize some of the known formulas for the core of an ideal to obtain formulas for the hull of a submodule of the injective hull of the residue field. The article concludes with illustrative examples in a numerical semigroup ring. 相似文献