全文获取类型
收费全文 | 5198篇 |
免费 | 366篇 |
国内免费 | 239篇 |
专业分类
化学 | 685篇 |
晶体学 | 6篇 |
力学 | 240篇 |
综合类 | 33篇 |
数学 | 1164篇 |
物理学 | 850篇 |
综合类 | 2825篇 |
出版年
2024年 | 17篇 |
2023年 | 59篇 |
2022年 | 106篇 |
2021年 | 147篇 |
2020年 | 132篇 |
2019年 | 87篇 |
2018年 | 93篇 |
2017年 | 118篇 |
2016年 | 148篇 |
2015年 | 113篇 |
2014年 | 255篇 |
2013年 | 269篇 |
2012年 | 296篇 |
2011年 | 288篇 |
2010年 | 246篇 |
2009年 | 237篇 |
2008年 | 270篇 |
2007年 | 343篇 |
2006年 | 344篇 |
2005年 | 305篇 |
2004年 | 250篇 |
2003年 | 241篇 |
2002年 | 231篇 |
2001年 | 177篇 |
2000年 | 156篇 |
1999年 | 147篇 |
1998年 | 115篇 |
1997年 | 91篇 |
1996年 | 73篇 |
1995年 | 71篇 |
1994年 | 62篇 |
1993年 | 51篇 |
1992年 | 59篇 |
1991年 | 48篇 |
1990年 | 27篇 |
1989年 | 30篇 |
1988年 | 21篇 |
1987年 | 15篇 |
1986年 | 7篇 |
1985年 | 14篇 |
1984年 | 14篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1970年 | 1篇 |
1969年 | 2篇 |
1955年 | 2篇 |
排序方式: 共有5803条查询结果,搜索用时 46 毫秒
11.
C. H. Hesse 《Statistical Inference for Stochastic Processes》2007,10(1):75-95
In this work the Cauchy problem for the one-dimensional heat equation is considered. In contrast to existing literature it
is assumed that the initial state f is unknown and that information regarding f is obtained by some process of measurement. To enhance realism, both measurement errors and missing data are allowed for.
Under assumptions on f in the Fourier-domain first an approximation to f is derived from the data by means of a novel uncertainty principle. Then, it is studied how this perturbation in the initial
state propagates with time.
相似文献
12.
We develop a production policy that controls work-in-process (WIP) levels and satisfies demand in a multistage manufacturing system with significant uncertainty in yield, rework, and demand. The problem addressed in this paper is more general than those in the literature in three aspects: (i) multiple products are processed at multiple workstations, and the capacity of each workstation is limited and shared by multiple operations; (ii) the behavior of a production policy is investigated over an infinite-time horizon, and thus the system stability can be evaluated; (iii) the representation of yield and rework uncertainty is generalized. Generalizing both the system structure and the nature of uncertainty requires a new mathematical development in the theory of infinite-horizon stochastic dynamic programming. The theoretical contributions of this paper are the existence proofs of the optimal stationary control for a stochastic dynamic programming problem and the finite covariances of WIP and production levels under the general expression of uncertainty. We develop a simple and explicit sufficient condition that guarantees the existence of both the optimal stationary control and the system stability. We describe how a production policy can be constructed for the manufacturing system based on the propositions derived. 相似文献
13.
余学义 《西安科技大学学报》1996,(4)
通过分析地下开采的影响,黄土覆盖层变形裂缝规律,提出以开采方法和工艺方式来控制或减弱地表变形裂缝破坏程度,并在保护地表建筑物的前提下,最大限度回收“三下”呆滞煤炭 相似文献
14.
介绍了国内第一个综采放顶煤开采矿区铁路线下压煤试验面的成功经验,总结了试采中对铁路所采取的各种分析和维护措施,分析了该采煤方法下的地在移动和变形特点,为我国“三下”采煤领域提供了具有特色的成功实例。 相似文献
15.
This paper proposes a model for the parametric representation of linguistic hedges in Zadeh’s fuzzy logic. In this model each linguistic truth-value, which is generated from a primary term of the linguistic truth variable, is identified by a real number r depending on the primary term. It is shown that the model yields a method of efficiently computing linguistic truth expressions accompanied with a rich algebraic structure of the linguistic truth domain, namely De Morgan algebra. Also, a fuzzy logic based on the parametric representation of linguistic truth-values is introduced. 相似文献
16.
方然 《曲靖师范学院学报》2002,21(5):18-23
思想方法的更新是人类进步的重要标志之一。对这种标志的认识,在哲学史和文化史研究中通常不被人们所重视。人类思想史上最鲜明、最有意义的科学思维模式,主要表现为本文论及的五种类型,这些思维模式的互补与进步,是东西方文明相互推进的内在标志;对它们的研究和探讨,是把握先进文化前进方向的重要前提。 相似文献
17.
Bernardo Lafuerza-Guillén Donal O’regan Reza Saadati 《Proceedings Mathematical Sciences》2007,117(1):61-70
We introduce the concept of quotient in PN spaces and give some examples. We prove some theorems with regard to the completeness
of a quotient. 相似文献
18.
对Hajek-Renyi不等式进行了推广,利用推广的不等式给出了随机变量序列绝对平均意义下的强大数定律的一个条件. 相似文献
19.
Kj?rand Iversen Per Nilsson 《International Journal of Computers for Mathematical Learning》2007,12(2):113-133
This paper focuses on the different ways in which students in lower secondary school (14–16 year olds) experience compound
random events, presented to them in the form of combined junctions. A carefully designed ICT environment was developed enabling
the students to interact with different representations of such structures. Data for the analysis was gathered from two interview
sessions. The analysis of the interaction is based on constructivist principles on learning; i.e. we adopted a student-oriented
perspective, taking into consideration the different ways students try to make sense of chance encounters.
Our results show how some students give priority to geometrical and physical concerns, and we discuss how seeking causal explanations
of random phenomena may have encouraged this. With respect to numerically oriented models a division strategy appears to stand
out as the preferred one. 相似文献
20.
为解决以多维矢量形式存在被测对象的测量质量评定问题,该文应用测量不确定度理论和多元概率统计方法,将测量不确定度理论进行了向多维的拓展;对多维情况下的测量不确定度传播律进行了推导;论述了多维不确定度的表示方法及空间几何意义;提出了以多维不确定度比较不同测量结果质量的方法;并给出了常用多维测量方法,如等精度独立多维测量和不等精度独立多维测量的不确定度评定方法。理论分析及仿真算例表明,所提出的理论具有较完备的体系,能够满足测量实际中常用多维测量方法的不确定度评定需求。 相似文献