全文获取类型
收费全文 | 90629篇 |
免费 | 1139篇 |
国内免费 | 197篇 |
专业分类
化学 | 50473篇 |
晶体学 | 1388篇 |
力学 | 3591篇 |
综合类 | 1篇 |
数学 | 8976篇 |
物理学 | 27536篇 |
出版年
2022年 | 733篇 |
2021年 | 1172篇 |
2020年 | 1211篇 |
2019年 | 1340篇 |
2018年 | 1824篇 |
2017年 | 1882篇 |
2016年 | 2578篇 |
2015年 | 1394篇 |
2014年 | 2187篇 |
2013年 | 4090篇 |
2012年 | 3888篇 |
2011年 | 4400篇 |
2010年 | 3291篇 |
2009年 | 3208篇 |
2008年 | 3881篇 |
2007年 | 3668篇 |
2006年 | 3507篇 |
2005年 | 3076篇 |
2004年 | 2801篇 |
2003年 | 2538篇 |
2002年 | 2628篇 |
2001年 | 2523篇 |
2000年 | 1877篇 |
1999年 | 1427篇 |
1998年 | 1232篇 |
1997年 | 1158篇 |
1996年 | 1027篇 |
1995年 | 942篇 |
1994年 | 907篇 |
1993年 | 896篇 |
1992年 | 955篇 |
1991年 | 996篇 |
1990年 | 955篇 |
1989年 | 964篇 |
1988年 | 855篇 |
1987年 | 794篇 |
1986年 | 763篇 |
1985年 | 913篇 |
1984年 | 1001篇 |
1983年 | 847篇 |
1982年 | 870篇 |
1981年 | 773篇 |
1980年 | 725篇 |
1979年 | 791篇 |
1978年 | 920篇 |
1977年 | 941篇 |
1976年 | 833篇 |
1975年 | 795篇 |
1974年 | 797篇 |
1973年 | 777篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Novikova D. A. Flisyuk O. M. Martsulevich N. A. Garabadzhiu A. V. 《Russian Journal of General Chemistry》2021,91(7):1387-1392
Russian Journal of General Chemistry - The main sources of emissions of industrial nitrogen oxides have been reviewed. A promising method for the absorption of nitrogen monoxide by a reusable... 相似文献
22.
23.
Close‐Packed Two‐Dimensional Silver Nanoparticle Arrays: Quadrupolar and Dipolar Surface Plasmon Resonance Coupling
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Sukang Yun Soonchang Hong Jesus A. I. Acapulco Jr. Ho Young Jang Songyi Ham Kyungeun Lee Prof. Seong Kyu Kim Prof. Sungho Park 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(16):6165-6172
Silver nanoparticles (NPs) ranging in size from 40 to 100 nm were prepared in high yield by using an improved seed‐mediated method. The homogeneous Ag NPs were used as building blocks for 2D assembled Ag NP arrays by using an oil/water interface. A close‐packed 2D array of Ag NPs was fabricated by using packing molecules (3‐mercaptopropyltrimethoxysilane) to control the interparticle spacing. The homogeneous 2D Ag NP array exhibited a strong quadrupolar cooperative plasmon mode resonance and a dipolar red‐shift relative to individual Ag NPs suspended in solution. A well‐arranged 2D Ag NP array was embedded in polydimethylsiloxane film and, with biaxial stretching to control the interparticle distance, concomitant variations of the quadrupolar and dipolar couplings were observed. As the interparticle distance increased, the intensity of the quadrupolar cooperative plasmon mode resonance decreased and dipolar coupling completely disappeared. The local electric field of the 2D Ag NP array was calculated by using finite difference time domain simulation and qualitatively showed agreement with the experimental measurements. 相似文献
24.
25.
Development of biocompatible porous supports is a promising strategy in the field of tissue engineering for the repair and regeneration of bone tissues with severe damage. Graphene oxide aerogels (GOAs) are excellent candidates for the manufacture of these systems due to their porosity, ability to imitate bone structure, and mechanical resistance, and according to their surface chemical reactivity, they can facilitate osseointegration, osteogenesis, osteoinduction and osteoconduction. In this review, synthesis of GOAs from the most primary source is described, and recent studies on the use of these functionalized carbonaceous foams as scaffolding for bone tissue regeneration are presented. 相似文献
26.
27.
Journal of Experimental and Theoretical Physics - We suggest that the principle of holographic duality be extended beyond conformal invariance and AdS isometry. Such an extension is based on a... 相似文献
28.
29.
Star copolymers have attracted significant interest due to their different characteristics compared with diblock copolymers, including higher critical micelle concentration, lower viscosity, unique spatial shape, or morphologies. Development of synthetic skills such as anionic polymerization and controlled radical polymerization have made it possible to make diverse architectures of polymers. Depending on the molecular architecture of the copolymer, numerous morphologies are possible, for instance, Archimedean tiling patterns and cylindrical microdomains at symmetric volume fraction for miktoarm star copolymers as well as asymmetric lamellar microdomains for star‐shaped copolymers, which have not been reported for linear block copolymers. In this review, we focus on morphologies and microphase separations of miktoarm (AmBn and ABC miktoarm) star copolymers and star‐shaped [(A‐b‐B)n] copolymers with nonlinear architecture. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 1–21 相似文献
30.