全文获取类型
收费全文 | 74689篇 |
免费 | 5504篇 |
国内免费 | 4023篇 |
专业分类
化学 | 5530篇 |
晶体学 | 77篇 |
力学 | 3032篇 |
综合类 | 630篇 |
数学 | 10041篇 |
物理学 | 11181篇 |
综合类 | 53725篇 |
出版年
2024年 | 142篇 |
2023年 | 469篇 |
2022年 | 928篇 |
2021年 | 1073篇 |
2020年 | 1147篇 |
2019年 | 952篇 |
2018年 | 951篇 |
2017年 | 1396篇 |
2016年 | 1561篇 |
2015年 | 1844篇 |
2014年 | 3383篇 |
2013年 | 3317篇 |
2012年 | 3892篇 |
2011年 | 4431篇 |
2010年 | 3651篇 |
2009年 | 4000篇 |
2008年 | 4433篇 |
2007年 | 5633篇 |
2006年 | 5011篇 |
2005年 | 4843篇 |
2004年 | 4422篇 |
2003年 | 3906篇 |
2002年 | 3324篇 |
2001年 | 2736篇 |
2000年 | 2313篇 |
1999年 | 2138篇 |
1998年 | 1726篇 |
1997年 | 1640篇 |
1996年 | 1418篇 |
1995年 | 1319篇 |
1994年 | 1104篇 |
1993年 | 985篇 |
1992年 | 806篇 |
1991年 | 738篇 |
1990年 | 640篇 |
1989年 | 518篇 |
1988年 | 480篇 |
1987年 | 321篇 |
1986年 | 208篇 |
1985年 | 103篇 |
1984年 | 63篇 |
1983年 | 33篇 |
1982年 | 39篇 |
1981年 | 39篇 |
1980年 | 29篇 |
1979年 | 29篇 |
1978年 | 16篇 |
1977年 | 12篇 |
1976年 | 10篇 |
1955年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Studies on ternary phase diagrams of the Na-Fe-O system have been carried out from the thermodynamic point of view. Thermodynamic data of main ternary Na-Fe oxides Na4FeO3(s), Na3FeO3(s), Na5FeO4(s) and Na8Fe2O7(s) have been assessed. A user database has been created by reviewing literature data together with recent DSC and vapor pressure measurements by the present authors. New ternary phase diagrams of the Na-Fe-O system have been constructed from room temperature to 1000 K. Stable conditions of the ternary oxides at 800 K were presented in predominance diagram as functions of oxygen pressure and sodium pressure. 相似文献
82.
In this paper political and economic rationality is modelled regarding an economic problem with a four-dimensional dynamical system taking into consideration the information about the problem spread among the people who support the political alternatives. Under special parameter conditions velcro bifurcation occurs, which destabilizes the equilibrium points when information is going to spread. The last stable equilibrium point is related to the economically rational equilibrium point. 相似文献
83.
In this paper, we study the stability conditions of the MMAP[K]/G[K]/1/LCFS preemptive repeat queue. We introduce an embedded Markov chain of matrix M/G/1 type with a tree structure and identify conditions for the Markov chain to be ergodic. First, we present three conventional methods for the stability problem of the queueing system of interest. These methods are either computationally demanding or do not provide accurate information for system stability. Then we introduce a novel approach that develops two linear programs whose solutions provide sufficient conditions for stability or instability of the queueing system. The new approach is numerically efficient. The advantages and disadvantages of the methods introduced in this paper are analyzed both theoretically and numerically. 相似文献
84.
研究了Birkhoff系统的Hojman定理的几何基础.建立了系统的运动微分方程和Hojman守恒 定理,利用现代微分几何给出了Birkhoff系统的Hojman定理的一个证明.
关键词:
Birkhoff系统
Hojman定理
对称性
微分几何 相似文献
85.
Norikazu Yamaguchi 《Mathematical Methods in the Applied Sciences》2005,28(13):1507-1526
In this paper we are concerned with the initial boundary value problem of the micropolar fluid system in a three dimensional bounded domain. We study the resolvent problem of the linearized equations and prove the generation of analytic semigroup and its time decay estimates. In particular, Lp–Lq type estimates are obtained. By use of the Lp–Lq estimates for the semigroup, we prove the existence theorem of global in time solution to the original nonlinear problem for small initial data. Furthermore, we study the magneto‐micropolar fluid system in the final section. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
86.
A new grid‐free upwind relaxation scheme for simulating inviscid compressible flows is presented in this paper. The non‐linear conservation equations are converted to linear convection equations with non‐linear source terms by using a relaxation system and its interpretation as a discrete Boltzmann equation. A splitting method is used to separate the convection and relaxation parts. Least squares upwinding is used for discretizing the convection equations, thus developing a grid‐free scheme which can operate on any arbitrary distribution of points. The scheme is grid free in the sense that it works on any arbitrary distribution of points and it does not require any topological information like elements, faces, edges, etc. This method is tested on some standard test cases. To explore the power of the grid‐free scheme, solution‐based adaptation of points is done and the results are presented, which demonstrate the efficiency of the new grid‐free scheme. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
87.
电站锅炉系统性能仿真模型的建立 总被引:1,自引:0,他引:1
1引言根据热力学第二定律,燃料中的化学拥将近一半损失在锅炉的燃烧与传热过程中。因此,优化锅炉性能对降低整个火电机组的煤耗率具有明显效果。完整的锅炉系统由磨煤机、送风机、一次风机、弓讯机、炉膛、汽包、过热器、再热器、省煤器、空气预热器等单元组成,这些单元之间的联结错综复杂。本文建立了锅炉系统中通用单元的性能模型,并在此基础上,对锅炉系统的结构特点进行了分析,利用过程系统工程中的序贯模块法建立了整个锅炉系统的性能模型。对单元的划分、回路的切断及断裂流股的收敛与迭代策略提出了自己的观点。最后根据生产厂… 相似文献
88.
This paper presents a unified analysis of decomposition algorithms for continuously differentiable optimization problems defined on Cartesian products of convex feasible sets. The decomposition algorithms are analyzed using the framework of cost approx imation algorithms. A convergence analysis is made for three decomposition algorithms: a sequential algorithm which extends the classical Gauss-Seidel scheme, a synchronized parallel algorithm which extends the Jacobi method, and a partially asynchronous parallel algorithm. The analysis validates inexact computations in both the subproblem and line search phases, and includes convergence rate results. The range of feasible step lengths within each algorithm is shown to have a direct correspondence to the increasing degree of parallelism and asynchronism, and the resulting usage of more outdated information in the algorithms. 相似文献
89.
陈刚 《西北大学学报(自然科学版)》1995,(5)
运用深盆气圈闭的基本原理,综合分析了鄂尔多斯盆地下古生界天然气赋存的基本地质因素,论证并提出了盆地腹部下古生界深盆气圈闭的新认识,并依据盆地地质构造特征将其进一步划分为:西部前渊拗陷型和中东部复式向斜型两大深盆气赋存系统. 相似文献
90.
李梧生 《汕头大学学报(自然科学版)》1995,10(1):22-27
本文对一类对称的三次微分系统进行探讨,对每个奇点导出表示其鞍结性的型号公式。给出(K3)所有的六种全局相图。 相似文献