全文获取类型
收费全文 | 342篇 |
免费 | 21篇 |
国内免费 | 2篇 |
专业分类
化学 | 243篇 |
晶体学 | 1篇 |
力学 | 22篇 |
数学 | 38篇 |
物理学 | 61篇 |
出版年
2023年 | 2篇 |
2022年 | 12篇 |
2021年 | 24篇 |
2020年 | 23篇 |
2019年 | 17篇 |
2018年 | 22篇 |
2017年 | 24篇 |
2016年 | 40篇 |
2015年 | 7篇 |
2014年 | 26篇 |
2013年 | 37篇 |
2012年 | 21篇 |
2011年 | 18篇 |
2010年 | 21篇 |
2009年 | 14篇 |
2008年 | 10篇 |
2007年 | 7篇 |
2006年 | 7篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1991年 | 2篇 |
1986年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 5篇 |
1969年 | 1篇 |
排序方式: 共有365条查询结果,搜索用时 31 毫秒
91.
Azadeh Azadbakht Jalaledin Aali Amir Reza Abbasi Maryam Maghsudi 《Russian Journal of Electrochemistry》2017,53(4):345-351
Thin films of a three-dimensional porous Zn(II)-based metal–organic framework, [Zn2(NH2-BDC)2(4-bpdb)] · 3DMF (TMU-17-NH2), containing azine-functionalized pores, were deposited on surfaces of silk fiber via a stepwise manner. The effect of sequential dipping steps in growth of TMU-17-NH2 has been studied. These systems depicted a decrease in the size accompanying a decrease in the sequential dipping steps. The TMU-17-NH2 has been used as matrices for the adsorption and in vitro guest delivery of methyldopa (MD). 相似文献
92.
Abbasi Zahra Bahrololoom M. Ebrahim Bagheri Rafat Shariat Mohammad H. 《Journal of Sol-Gel Science and Technology》2017,81(2):523-533
Journal of Sol-Gel Science and Technology - Although dental ceramic restorations are biocompatible, they are not necessarily bioactive. They can be modified by bioactive glasses to exhibit... 相似文献
93.
Synthesis and catalytic study of open metal site metal–organic frameworks of Cu3(BTC)2 microbelts in selective organic sulfide oxidation
下载免费PDF全文
![点击此处可从《应用有机金属化学》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The synthesis of open metal site metal–organic frameworks of Cu3(BTC)2 with microbelt morphology and a study of the catalytic oxidation of organic sulfides are reported. This CuBTC was found to be an efficient, selective and waste‐free green heterogeneous co‐catalyst for the green H2O2 catalytic oxidation of sulfides. The catalyst can be isolated from the reaction mixture and reused at least five times. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
94.
95.
96.
A three-component domino reaction approach between a primary amine, a dialkyl acetylenedicarboxylate, and 1,3-dimethylalloxan that affords novel oxaspirobicyclic γ-butenolidobarbiturate derivatives is reported. The reaction sequence consists of an initial Michael-addition of primary amines to dialkyl acetylenedicarboxylates, followed by aldol-like reaction with 1,3-dimethylalloxan, and then γ-lactonization to afford the products. This cascade reaction sequence represents a rapid and unprecedented route to the described biologically interesting molecules. 相似文献
97.
98.
Zhao Yue Waqas Khalid Marco Zanella Azhar Zahoor Abbasi Andrea Pfreundt Pilar Rivera Gil Kirsten Schubert Fred Lisdat Wolfgang J. Parak 《Analytical and bioanalytical chemistry》2010,396(3):1095-1103
Gold electrodes with switchable conductance are created by coating the gold surface with different colloidal quantum dots.
For the quantum dot immobilization, a dithiol compound was used. By polarizing the electrode and applying a light pointer,
local photocurrents were generated. The performance of this setup was characterized for a variety of different nanoparticle
materials regarding drift and signal-to-noise ratio. We varied the following parameters: quantum dot materials and immobilization
protocol. The results indicate that the performance of the sensor strongly depends on how the quantum dots are bound to the
gold electrode. The best results were obtained by inclusion of an additional polyelectrolyte film, which had been fabricated
using layer-by-layer assembly.
相似文献
99.
S. Mahmood S.A. Abbasi S. Jabeen M.A. Baig 《Journal of Quantitative Spectroscopy & Radiative Transfer》2010,111(5):689-695
We present laser-induced breakdown spectroscopic studies of variety of marbles extracted from Quetta region of Boluchistan, Pakistan using a Nd:YAG laser (532 nm) in conjunction with LIBS 2000 detection system. The emission spectra of Onyx (white spot) and Quetta Green Marble samples have been recorded as a function of laser irradiance. The elemental composition and their relative abundance in each sample are fond to be quite different. In Onyx (white spot), calcium dominates while in the Quetta Green marble magnesium is the dominant element. In addition the effect of the laser irradiance on the emission intensity, width and shift of the transition lines have been studied. 相似文献
100.
A graph, G, is called uniquely Hamiltonian if it contains exactly one Hamilton cycle. We show that if G=(V, E) is uniquely Hamiltonian then
Where #(G)=1 if G has even number of vertices and 2 if G has odd number of vertices. It follows that every n-vertex uniquely Hamiltonian graph contains a vertex whose degree is at most c log2n+2 where c=(log23−1)−1≈1.71 thereby improving a bound given by Bondy and Jackson [3]. 相似文献