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   157578篇
  免费   18955篇
  国内免费   14357篇
化学   72470篇
晶体学   1135篇
力学   5877篇
综合类   666篇
数学   12616篇
物理学   39577篇
综合类   58549篇
  2024年   638篇
  2023年   2692篇
  2022年   4530篇
  2021年   4907篇
  2020年   4828篇
  2019年   4243篇
  2018年   4237篇
  2017年   3915篇
  2016年   5710篇
  2015年   6209篇
  2014年   8067篇
  2013年   9649篇
  2012年   11377篇
  2011年   11691篇
  2010年   8840篇
  2009年   8776篇
  2008年   9441篇
  2007年   8707篇
  2006年   7940篇
  2005年   7103篇
  2004年   5445篇
  2003年   4681篇
  2002年   4496篇
  2001年   4163篇
  2000年   3635篇
  1999年   4707篇
  1998年   3972篇
  1997年   3795篇
  1996年   3656篇
  1995年   3143篇
  1994年   2863篇
  1993年   2344篇
  1992年   2068篇
  1991年   1885篇
  1990年   1548篇
  1989年   1386篇
  1988年   1067篇
  1987年   754篇
  1986年   580篇
  1985年   340篇
  1984年   207篇
  1983年   156篇
  1982年   126篇
  1981年   78篇
  1980年   59篇
  1979年   26篇
  1978年   22篇
  1976年   24篇
  1975年   22篇
  1957年   26篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
通过对“ちょっヒ”四种用法的考察,可以发现“ちょっヒ”的比较标准由客观存在的事物转向了主观判断,其客观性逐渐减弱,主观性逐渐加强。这些变化反映了日本人中考虑对方心理感受的文化心理。  相似文献   
122.
分子间的范德华力是十分微弱的,但可以说普遍的存在着,在很多体系中起着巨大的作用,在物理学、化学、生物学等学科中得到了广泛的研究。但怎样计算范德华力?如何考虑各种条件对范德华力的影响?  相似文献   
123.
Effects of ion impinging on the microstructure and field electron emission properties of screen-printed carbon nanotube films were investigated. We observed that the plasma treatment modified the microstructure of CNTs along with the remarkable increase of emission site density. With the prolongation of ion impinging time, the emission current falls down first, and then rises up to higher than that of the untreated films. It is proposed that the change of emission characteristics is due to the different emission mechanisms. After the treatment, electrons are emitted predominantly from the nano-nodes on the tube wall instead from the nanotube tips.  相似文献   
124.
μC/OS-Ⅱ is an open source real-time kernel adopting priority preemptive schedule strategy. Aiming at the problem of μC/OS-Ⅱ failing to support homology priority tasks scheduling, an approach for solution is proposed. The basic idea is adding round-robin scheduling strategy in its original scheduler in order to schedule homology priority tasks through time slice roundrobin. Implementation approach is given in detail. Firstly, the Task Control Block (TCB) is extended. And then, a new priority index table is created, in which each index pointer points to a set of homology priority tasks. Eventually, on the basis of reconstructing μC/OS-Ⅱ real-time kernel, task scheduling module is rewritten. Otherwise, schedulability of homology task supported by modified kernel had been analyzed, and deadline formula of created homology tasks is given. By theoretical analysis and experiment verification, the modified kernel can support homology priority tasks scheduling, meanwhile, it also remains preemptive property of original μC/OS-Ⅱ.  相似文献   
125.
A new family of photonucleases, naphthalimide-thiazoles was synthesized and evaluated. These compounds intercalated into DNA efficiently and damaged DNA photochemically at concentrations as low as 5 μM. Mechanistic experiment suggests that a novel naphthalimide-thiazole radical produced via an excited triple state might be involved in the DNA photodamage. Different activity may arise from the impact of substituents at 2-phenyl ring of thiazole on the electron population of excited triple state according to AM1 semi-empirical calculation.  相似文献   
126.
127.
廉租房作为解决城镇低收入家庭住房问题的一种主要渠道,其建设的进展情况并不乐观,在建设模式、资金供应、分配标准等方面仍存在不少问题。为此,需要加强认识、采取多元化融资方式、完善廉租房相关制度,使廉租房建设真正落实到位,从而促进我国住房保障体系乃至整个房地产市场的健康发展。  相似文献   
128.
The dielectric constant for rain medium is investigated by utilizing the system identification method. The rain rate model and frequency model of permittivity in millimeter waves band for rain medium are presented. The results obtained with models are in very good agreement with references in calculating the attenuation of electromagnetic waves induced by rain, which Shows that the obtained models are valid and practicable. The cross-polar discrimination gotten with rain rate model is in agreement with references.  相似文献   
129.
学生学习知识,一般来说,是从生动的具体的直观开始的,生动的直观能使学生获得关于事物生动而具体的感性认识。但是,感性认识并没有揭露事物的本质,人们对事物本质的认识要通过一系列的抽象来完成。  相似文献   
130.
The relationship of resistivity versus synthesizing temperature of sol gel YBa_2Cu_3O_y samples was studied when prepared under flowing oxygen conditions. A set of high-temperature ρ-T curves was obtained for the whole process. After the sample finished the test measuring, its resistivity was ρ_{300}=9.83×10^{-3 }Ω·cm at room temperature. The ρ-T curve also showed that the orthorhombic-tetragonal phase transformation of sol-gel YBa_2Cu_3O_y sample occurred at 581℃ for the sample in the rising temperature process, but at 613℃ in the cooling process, lower than that of the samples made by using the conventional powder metallurgy methods.  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