全文获取类型
收费全文 | 152篇 |
免费 | 12篇 |
专业分类
化学 | 107篇 |
晶体学 | 1篇 |
力学 | 3篇 |
数学 | 24篇 |
物理学 | 29篇 |
出版年
2024年 | 4篇 |
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 4篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 7篇 |
2017年 | 3篇 |
2016年 | 10篇 |
2015年 | 9篇 |
2014年 | 8篇 |
2013年 | 15篇 |
2012年 | 19篇 |
2011年 | 14篇 |
2010年 | 16篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 3篇 |
2006年 | 8篇 |
2005年 | 10篇 |
2004年 | 5篇 |
2003年 | 1篇 |
1998年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
排序方式: 共有164条查询结果,搜索用时 15 毫秒
161.
Fatma Demir Niko Van den Brande Bruno Van Mele Sabine Bertho Dirk Vanderzande Jean Manca Guy Van Assche 《Journal of Thermal Analysis and Calorimetry》2011,105(3):845-849
Defining appropriate annealing temperatures and times is vitally important for increasing the efficiency of bulk heterojunction
solar cells by favoring the crystallinity of the polymer-fullerene blend components. In order to better understand the annealing
process, the isothermal crystallization of poly(3-hexyl thiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blend investigated by means of rapid heating cooling calorimetry (RHC). Isothermal crystallization
experiments at temperatures in between the glass transition and melting, within the temperature range of 70–150 °C, can successfully
be performed since RHC permits cooling at a sufficiently high rate in order to prevent crystallization during cooling. Crystallization
isotherms were determined from the subsequent melting behavior of the blend. They were measured for a wide set of annealing
temperatures and times, and the evolution of the crystallization rate with temperature is compared for annealing from the
glassy state and from the melt state. 相似文献
162.
Niko S. Radulović Marko Z. Mladenović Zorica Stojanović-Radić Goran A. Bogdanović Dragana Stevanović Rastko D. Vukićević 《Molecular diversity》2014,18(3):497-510
A library of 16 2-substituted methyl acetoacetates containing ferrocenyl or phenyl units was designed to disclose differences in the antimicrobial activity of ferrocene-containing compounds and their phenyl analogs. Two methyl acetoacetates, whose structures do not contain an aromatic nucleus, were also included in order to probe the inherent activity of the scaffold itself. The acetoacetates were synthesized (low-to-good yields) and fully characterized by spectral (MS, IR, UV–Vis, 1D and 2D NMR) and electrochemical (cyclic voltammetry) techniques. Single-crystal X-ray analysis has been performed for methyl 2-acetyl-2-(ferrocenylmethyl)-5-methylhex-4-enoate. All compounds have demonstrated in vitro antimicrobial activity against six bacterial (three Gram-positive and three Gram-negative) and two fungal strains with minimal inhibitory concentration values of 0.0050–20.6 \(\upmu \hbox {mol mL}^{-1}\) . The most active compound was 2-acetyl-2-(ferrocenylmethyl)-4-methylpent-4-enoate whose activity was comparable to that of nystatin against the yeast Candida albicans. Agglomerative hierarchical clustering statistical analysis of the antimicrobial assay data demonstrated that ferrocene-containing compounds have statistically different and greater antimicrobial activity when compared to their phenyl analogs. 相似文献
163.
Dragana Stevanović Anka Pejović Ivan S. Damljanović Mirjana D. Vukićević Georgi Dobrikov Vladimir Dimitrov Marija S. Denić Niko S. Radulović Rastko D. Vukićević 《Helvetica chimica acta》2013,96(6):1103-1110
Two variants of a new pathway for the synthesis of (±)‐curcumene ether are described. The key steps in these procedures are intramolecular cyclizations of 6‐methyl‐2‐(4‐methylphenyl)hept‐6‐en‐2‐ol and 2‐methyl‐6‐(4‐methylphenyl)hept‐6‐en‐2‐ol by means of an electrochemically generated phenylselenyl cation. This synthetic approach provides significantly better yields than the previously reported protocols. 相似文献
164.
Hydrazinium 5‐nitrimino‐1H‐tetrazolate ( 1 ) and dihydrazinium nitriminotetrazolate monohydrate ( 2 ) were synthesized by the reaction of hydrazine with 5‐nitriminotetrazole. The energetic compounds 1 and 2 were characterized by single‐crystal X‐ray diffraction (only 2 ), NMR spectroscopy, IR‐ and Raman spectroscopy as well as DSC measurements. The sensitivities towards impact, friction and electrical discharge were determined. In addition, several detonation parameters (e.g. heat of explosion, detonation velocity) were computed by the EXPLO5 computer code based on calculated (CBS‐4M) heats of formation and X‐ray densities. 相似文献