首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3954篇
  免费   347篇
  国内免费   307篇
化学   356篇
晶体学   5篇
力学   322篇
综合类   65篇
数学   2895篇
物理学   965篇
  2024年   4篇
  2023年   30篇
  2022年   71篇
  2021年   101篇
  2020年   79篇
  2019年   91篇
  2018年   75篇
  2017年   92篇
  2016年   117篇
  2015年   65篇
  2014年   133篇
  2013年   358篇
  2012年   176篇
  2011年   214篇
  2010年   199篇
  2009年   240篇
  2008年   260篇
  2007年   278篇
  2006年   235篇
  2005年   204篇
  2004年   160篇
  2003年   198篇
  2002年   170篇
  2001年   129篇
  2000年   120篇
  1999年   109篇
  1998年   120篇
  1997年   101篇
  1996年   70篇
  1995年   53篇
  1994年   39篇
  1993年   41篇
  1992年   28篇
  1991年   21篇
  1990年   25篇
  1989年   20篇
  1988年   28篇
  1987年   23篇
  1986年   15篇
  1985年   25篇
  1984年   14篇
  1983年   9篇
  1982年   17篇
  1981年   9篇
  1980年   6篇
  1979年   5篇
  1978年   6篇
  1977年   4篇
  1976年   9篇
  1973年   5篇
排序方式: 共有4608条查询结果,搜索用时 15 毫秒
111.
Perturbation theory in a framework of iteration methods   总被引:1,自引:0,他引:1  
In a previous paper [J. Phys. A 36 (2003) 11807], we introduced the ‘asymptotic iteration method’ for solving second-order homogeneous linear differential equations. In this Letter, we study perturbed problems in quantum mechanics and we use the method to find the coefficients in the perturbation series for the eigenvalues and eigenfunctions directly, without first solving the unperturbed problem.  相似文献   
112.
连续动力系统时间序列的非线性检验   总被引:2,自引:0,他引:2       下载免费PDF全文
雷敏  孟光  冯正进 《物理学报》2005,54(3):1059-1063
用相位随机化的替代数据方法,研究了连续混沌动力系统时间序列的非线性检验判定.研究发现,在不同的采样情况下,混沌时间序列的非线性特性检验有所差异,尤其对于过采样时间序列,往往会出现虚假的判断结果.针对过采样时间序列,最好采用能够反映非线性特征的参数,作为检验统计量进行检验判断. 关键词: 替代数据 关联维数 连续时间序列 非线性检验  相似文献   
113.
During the design process of Blu-ray disc optical pick-up (BD OPU), the optical system and the collimator lens design is especially important. This paper designs an optical system and some lenses for the BD OPU, including collimator lens, beam shaping lens for laser beam shaping, and cylinder lens for signal detecting. In this OPU, we use a triplet lens to collimate the laser beam. At the same time, we build a series of assembly jigs to make sure that each lens can be put into the OPU basement properly. At last, we get the reading spot image and S-curve photo of OPU, which can be used to read Blu-ray disc (BD).  相似文献   
114.
与方波合成有关的李萨如图形的实验与理论研究   总被引:1,自引:0,他引:1  
通过方波与方波、正弦波与方波合成的图形来研究李萨如图形,利用傅里叶级数理论把方波展开为正弦和余弦形式的傅里叶级数,然后利用Matlab软件来合成2列相互垂直的方波与正弦波以及2列方波的李萨如图形,并与实验上观察到的现象进行比较,并分析了两者之间的差异.  相似文献   
115.
We investigate scaling and memory effects in return intervals between price volatilities above a certain threshold q for the Japanese stock market using daily and intraday data sets. We find that the distribution of return intervals can be approximated by a scaling function that depends only on the ratio between the return interval τ and its mean 〈τ〉. We also find memory effects such that a large (or small) return interval follows a large (or small) interval by investigating the conditional distribution and mean return interval. The results are similar to previous studies of other markets and indicate that similar statistical features appear in different financial markets. We also compare our results between the period before and after the big crash at the end of 1989. We find that scaling and memory effects of the return intervals show similar features although the statistical properties of the returns are different.  相似文献   
116.
A systematic method for developing high-order, zero-temperature perturbation expansions for quantum many-body systems is presented. The models discussed explicitly are spin models with a variety of interactions, in one and two dimensions. The wide applicability of the method is illustrated by expansions around Hamiltonians with ordered and disordered ground states, namely Ising and dimerized models. Computer implementation of this method is discussed in great detail. Some previously unpublished series are tabulated.  相似文献   
117.
Correlation of foreign exchange rates in currency markets is investigated based on the empirical data of USD/DEM and USD/JPY exchange rates for a period from February 1 1986 to December 31 1996. The return of exchange time series is first decomposed into a number of intrinsic mode functions (IMFs) by the empirical mode decomposition method. The instantaneous phases of the resultant IMFs calculated by the Hilbert transform are then used to characterize the behaviors of pricing transmissions, and the correlation is probed by measuring the phase differences between two IMFs in the same order. From the distribution of phase differences, our results show explicitly that the correlations are stronger in daily time scale than in longer time scales. The demonstration for the correlations in periods of 1986–1989 and 1990–1993 indicates two exchange rates in the former period were more correlated than in the latter period. The result is consistent with the observations from the cross-correlation calculation.  相似文献   
118.
In this paper we have analyzed the time series obtained from an experimental realization of an inductorless version of Chua’s circuit. We have also compared the experimental results with the results emerging by analysis of the time series obtained by numerical simulations of the respective model equations. Lyapunov exponent spectra, the Kaplan-Yorke dimension and phase-space diagrams were used to show the similarities between theoretical and experimental results. We were able to identify the effects of the operational amplifier simulated inductor internal resistance on the Chua’s circuit dynamics. Decreasing internal resistance for decreasing current through the circuit was responsible for the observed bifurcation route.  相似文献   
119.
水热法制备注射器样纳米氧化锌场发射特性的研究   总被引:1,自引:0,他引:1       下载免费PDF全文
王马华  朱汉青  朱光平 《物理学报》2011,60(7):77305-077305
应用水热法制备了注射器样纳米结构氧化锌样品,室温下测量其真空场发射特性.根据测量数据,基于Fowler-Nordheim方程,估算了场发射效应增强因子,观察到增强因子随外加电压增加取值的两阶段性;结合样品的光致发光谱和能量散射谱,应用半导体材料中强场效应理论,结合场发射电流密度测量系统的串联电路等效,研究样品中空位对场发射特性影响机理.结果表明,制备过程中形成的锌、氧空位,在样品中产生了相当于杂质态的缺陷能级,缺陷能级与样品形貌共同作用,使样品较大的增强因子随场强增加而阶跃性下降.最后,用电化学沉淀法和气 关键词: 场发射 强场效应 缺陷态 串联等效  相似文献   
120.
The coefficients in power series in the variable time that describe relaxation in a cooperative system can be calculated using a combinatorial approach where one considers how many ways one can introduce a given number of properly defined events in a system. The coefficients obtained in this manner can be related to the equilibrium virial coefficients for a mixture. If one assumes rapid internal equilibration, the relaxation process can be expressed completely in terms of the viral coefficients for a mixture with at most one solute particle, or, in some cases, just the virial coefficients for a single-component system. Thus, equilibrium virial coefficients can give useful information about the time evolution of processes in cooperative systems.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号