全文获取类型
收费全文 | 2495篇 |
免费 | 513篇 |
国内免费 | 205篇 |
专业分类
化学 | 469篇 |
晶体学 | 3篇 |
力学 | 149篇 |
综合类 | 38篇 |
数学 | 1009篇 |
物理学 | 349篇 |
无线电 | 1196篇 |
出版年
2024年 | 12篇 |
2023年 | 54篇 |
2022年 | 78篇 |
2021年 | 94篇 |
2020年 | 149篇 |
2019年 | 111篇 |
2018年 | 93篇 |
2017年 | 116篇 |
2016年 | 146篇 |
2015年 | 120篇 |
2014年 | 177篇 |
2013年 | 241篇 |
2012年 | 170篇 |
2011年 | 151篇 |
2010年 | 122篇 |
2009年 | 116篇 |
2008年 | 141篇 |
2007年 | 132篇 |
2006年 | 123篇 |
2005年 | 116篇 |
2004年 | 96篇 |
2003年 | 76篇 |
2002年 | 88篇 |
2001年 | 77篇 |
2000年 | 78篇 |
1999年 | 55篇 |
1998年 | 34篇 |
1997年 | 43篇 |
1996年 | 32篇 |
1995年 | 20篇 |
1994年 | 22篇 |
1993年 | 22篇 |
1992年 | 10篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 4篇 |
1984年 | 9篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1974年 | 2篇 |
1936年 | 1篇 |
排序方式: 共有3213条查询结果,搜索用时 15 毫秒
141.
142.
143.
Ge Zhang Xuewu Ou Chunyu Cui Jianmin Ma Jinghai Yang Yongbing Tang 《Advanced functional materials》2019,29(2)
Dual‐ion batteries (DIBs) have attracted much attention due to their advantages of low cost and especially environmental friendliness. However, the capacities of most DIBs are still unsatisfied (≈100 mAh g?1) ascribed to the limited capacity of anions intercalation for conventional graphite cathode. In this study, 3D porous microcrystalline carbon (3D‐PMC) was designed and synthesized via a self‐templated growth approach, and when used as cathode for a DIB, it allows both intercalation and adsorption of anions. The microcrystalline carbon is beneficial to obtain capacity originated from anions intercalation, and the 3D porous structure with a certain surface area contributes to anions adsorption capacity. With the synergistic effect, this 3D‐PMC is utilized as cathode and tin as anode for a sodium‐based DIB, which has a high capacity of 168.0 mAh g?1 at 0.3 A g?1, among the best values of reported DIBs so far. This cell also exhibits long‐term cycling stability with a capacity retention of ≈70% after 2000 cycles at a high current rate of 1 A g?1. It is believed that this work will provide a strategy to develop high‐performance cathode materials for DIBs. 相似文献
144.
一种新型的无线光通信调制方法 总被引:1,自引:0,他引:1
针对脉冲位置调制(PPM)和数字脉冲间隔调制(DPIM)等方法存在的问题,提出了一种新的双宽脉冲位置调制(DD-PPM)方式.在给出其符号结构的基础上,分析了带宽需求、传输容量和平均功率,推导出弱湍流信道下的误包率模型,并将其与开关键控调制(OOK),PPM和DPIM等典型调制方式进行了比较.理论分析和仿真结果表明,DD-PPM不仅比OOK具有更高的功率利用率和更好的差错性能,比PPM具有更高的带宽效率和传输容量,比DPIM具有相近甚至略好的差错性能,而且因符号长度固定,解调时不存在等待或缓存器溢出等问题,较DPIM更易工程实现.因而作为一种折中的调制方式,DD-PPM在无线光通信中有一定的应用场合. 相似文献
145.
提出了一种基于多输出端口电流控制电流传输器(MOCCCII,multiple outputs current controlled conveyor)的双模式二阶通用滤波器,该滤波器结构简单,仅由5个有源器件、2个接地电容构成, 无须外接电阻.该电路在不改变内部电路结构的情况下能实现电压模式和电流模式滤波器,且每一种工作模式都能实现高通、低通、带通等多种滤波功能,因此该电路具有通用性.面向实际电路完成了PSPICE仿真,结果表明提出的电路正确有效. 相似文献
146.
Flexible Transparent Reduced Graphene Oxide Sensor Coupled with Organic Dye Molecules for Rapid Dual‐Mode Ammonia Gas Detection
下载免费PDF全文
![点击此处可从《Advanced functional materials》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Le Thai Duy Tran Quang Trung Vinh Quang Dang Byeong‐Ung Hwang Saqib Siddiqui Il‐Yung Son Seung Kyun Yoon Dong June Chung Nae‐Eung Lee 《Advanced functional materials》2016,26(24):4329-4338
Flexible chemical sensors utilizing chemically sensitive nanomaterials are of great interest for wearable sensing applications. However, obtaining high performance flexible chemical sensors with high sensitivity, fast response, transparency, stability, and workability at ambient conditions is still challenging. Herein, a newly designed flexible and transparent chemical sensor of reduced graphene oxide (R‐GO) coupled with organic dye molecules (bromophenol blue) is introduced. This device has promising properties such as high mechanical flexibility (>5000 bending cycles with a bending radius of 0.95 cm) and optical transparency (>60% in the visible region). Furthermore, stacking the water‐trapping dye layer on R‐GO enables a higher response as well as workability in a large relative humidity range (up to 80%), and dual‐mode detection capabilities of colorimetric and electrical sensing for NH3 gas (5–40 ppm). These advantageous attributes of the flexible and transparent R‐GO sensor coupled with organic dye molecules provide great potential for real‐time monitoring of toxic gas/vapor in future practical chemical sensing at room conditions in wearable electronics. 相似文献
147.
148.
首先对受控源的电阻性和有源性进行了分析,然后比较完整系统地讨论了受控源的双重特性在线性时不变含受控源网络中的作用,并通过实例说明了受控源的双重特性在电路等效变换以及叠加定理中的具体的应用。 相似文献
149.
When solving unsteady computational fluid dynamics problems in aerodynamics with a gridless method, a cloud of points is usually required to be regenerated due to its accommodation to moving boundaries. In order to handle this problem conveniently, a fast dynamic cloud method based on Delaunay graph mapping strategy is proposed in this paper. A dynamic cloud method makes use of algebraic mapping principles and therefore points can be accurately redistributed in the flow field without any iteration. In this way, the structure of the gridless clouds is not necessarily changed so that the clouds regeneration can be avoided successfully. The spatial derivatives of the mathematical modeling of the flow are directly determined by using weighted least‐squares method in each cloud of points, and then numerical fluxes can be obtained. A dual time‐stepping method is further implemented to advance the two‐dimensional Euler equations in arbitrary Lagarangian–Eulerian formulation in time. Finally, unsteady transonic flows over two different oscillating airfoils are simulated with the above method and results obtained are in good agreement with the experimental data. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
150.