全文获取类型
收费全文 | 60篇 |
免费 | 8篇 |
国内免费 | 2篇 |
专业分类
化学 | 35篇 |
力学 | 8篇 |
数学 | 2篇 |
物理学 | 25篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 6篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 10篇 |
2011年 | 5篇 |
2010年 | 2篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2004年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
排序方式: 共有70条查询结果,搜索用时 15 毫秒
1.
An investigation of the copolymerization of allyl glycidyl ether (AGE) with methyl acrylate (MA) was performed in the presence
of benzyl imidazole-1-carbodithioate (BICDT) on the thermal initiation condition. Results showed that the process has good
characteristics of living free radical polymerization, i.e. the molecular weight of the obtained polymer increases linearly
with monomer conversion, molecular weight distribution is very narrow, and a linear relationship between ln([M]0/[M]) and polymerization time is found. The copolymer structure containing epoxy groups was demonstrated from the 1H nuclear magnetic resonance (1H NMR) spectrum. It was found that the content of AGE in the copolymer increases with the increase
in monomer conversion and molar faction of the AGE in the monomer feed. However, the polymerization could slow down when the
fraction of AGE increases in the monomer feed. Taking advantage of living polymerization character, functional block copolymers
PSt-b-P (MA-co-AGE) were prepared in the presence of PSt RAFT agent.
__________
Translated from Journal of Anhui University of Science and Technology, 2006, 26(3): 56–61 [译自: 安徽理工大学学报] 相似文献
2.
3.
A NEW ALGORITHM OF RELAXATION METHOD FOR PARTICLE ANALYSIS FROM FORWARD SCATTERED LIGHT 总被引:1,自引:0,他引:1
Jianqi Shen Mingxu Su Junfeng Li 《中国颗粒学报》2006,4(1):13-19
1. Introduction In many cases, particle dimension and size distribution play an important role in application. The analysis of parti- cle size is therefore necessary for research and develop- ment and also for process quality control in powder tech- nology and for many particle systems (Wang et al., 2000). Many instruments have been developed and constructed for this purpose. With the rapid development and availabil- ity of laser techniques, optoelectronics and microcomputer science, light sc… 相似文献
4.
Metallacyclobutadienes are analogues of cyclobutadienes in which one of the cyclobutadiene CR groups has been formally replaced by a transition‐metal fragment. These metallacycles are interesting because they can play an important role in catalysis and can serve as starting materials for the syntheses of organometallic compounds such as metallabenzene, η5‐cyclopentadienyl, and η3‐cyclopropenyl complexes. Unlike cyclobutadienes, metallacyclobutadienes can be significantly more stable. A number of metallacyclobutadienes have now been isolated and thoroughly characterized, especially for those that contain transition metals of groups 5–9. Their properties have also been actively investigated. This article highlights the chemistry of metallacyclobutadienes with reference to their syntheses, reactivity, and structural properties. 相似文献
5.
Zhongpeng Ding Yingwei Hou Shixiao Wang Tianwen Sun Mingxu Ma Huashi Guan Wenbao Li 《Molecular diversity》2017,21(3):577-583
Deuterium-enriched and fluorine-substituted compounds have been widely applied in drug discovery due to their advantages in the studies of clinical pharmacokinetics and metabolic profiles. Herein we synthesized a library of deuterated and fluorine-substituted plinabulin derivatives, and all 15 D- or F-compounds were characterized by MS, \(^{1}\hbox {H}\) NMR and \(^{ 13}\hbox {C}\,\hbox {NMR}\). Their antitumor activities were evaluated against human Jurkat T lymphocyte cells. 相似文献
6.
为了校正大扫描视场机载共形窗口引入的像差,提出一种基于固定校正板和透镜阵列的静态校正方法。首先使用固定校正板校正静态像差;然后在像面前安置固定的透镜阵列,利用透镜阵列中的各个透镜单元分别校正不同扫描角度的动态像差;最后基于所提方法设计应用在机载共形光学系统中的像差校正器。设计结果表明,所提方法在±42°的扫描视场范围内能够良好地校正共形窗口引入的像差。与其他动态或静态校正方法相比,所提方法可以实现大扫描视场机载共形光学系统像差的校正,同时降低机载共形光学系统的质量,提高系统的稳定性。 相似文献
7.
8.
Rigumula Wu Aruni P. K. K. Karunanayake Mudiyanselage Fatemeh Shafiei Bin Zhao Yousef Bagheri Qikun Yu Kathleen McAuliffe Kewei Ren Mingxu You 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(50):18439-18443
Precisely determining the intracellular concentrations of metabolites and signaling molecules is critical in studying cell biology. Fluorogenic RNA‐based sensors have emerged to detect various targets in living cells. However, it is still challenging to apply these genetically encoded sensors to quantify the cellular concentrations and distributions of targets. Herein, using a pair of orthogonal fluorogenic RNA aptamers, DNB and Broccoli, we engineered a modular sensor system to apply the DNB‐to‐Broccoli fluorescence ratio to quantify the cell‐to‐cell variations of target concentrations. These ratiometric sensors can be broadly applied for live‐cell imaging and quantification of metabolites, signaling molecules, and other synthetic compounds. 相似文献
9.
CUI Zhengying SUN Ping PAN Yudong LI Wei WANG Quanming CAO Zeng LIU Dequan WANG Mingxu 《核工业西南物理研究院年报(英文版)》2004,(1):8-10
HL-2A is a new middle-sized tokamak device with two closed divertors. In 2004 campaign siliconization as a wall condition has been first done on HL-2A since the starting operation of the device. By using sil-iconization we observed that impurity has been obviously decreased. The character of the siliconization and the effect of wall condition on plasma have been investigated as well as on the wall recycling. 相似文献
10.
石墨的化学腐蚀实验是在LAS-2000二次离子质谱仪的分析室中进行的,用高能氘离子束或与电子束联合辐照石墨,石墨温度从300-1000KW可调。辐照下释放的产物用四极质谱探头进行了质谱分析,得到了1.3μA、3keV氘束轰击下DSMF-800石墨释放氘甲烷的温度特性,在780K处有一释放高峰。 相似文献