全文获取类型
收费全文 | 636篇 |
免费 | 16篇 |
国内免费 | 4篇 |
专业分类
化学 | 386篇 |
晶体学 | 7篇 |
力学 | 19篇 |
数学 | 85篇 |
物理学 | 159篇 |
出版年
2024年 | 2篇 |
2023年 | 4篇 |
2022年 | 10篇 |
2021年 | 26篇 |
2020年 | 19篇 |
2019年 | 32篇 |
2018年 | 22篇 |
2017年 | 30篇 |
2016年 | 33篇 |
2015年 | 15篇 |
2014年 | 44篇 |
2013年 | 75篇 |
2012年 | 40篇 |
2011年 | 62篇 |
2010年 | 39篇 |
2009年 | 17篇 |
2008年 | 36篇 |
2007年 | 26篇 |
2006年 | 16篇 |
2005年 | 21篇 |
2004年 | 14篇 |
2003年 | 16篇 |
2002年 | 8篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 5篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1985年 | 3篇 |
1972年 | 2篇 |
排序方式: 共有656条查询结果,搜索用时 15 毫秒
651.
652.
Large Spin‐Relaxation Barriers for the Low‐Symmetry Organolanthanide Complexes [Cp*2Ln(BPh4)] (Cp*=pentamethylcyclopentadienyl; Ln=Tb,Dy) 下载免费PDF全文
Dr. Selvan Demir Dr. Joseph M. Zadrozny Prof. Dr. Jeffrey R. Long 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(31):9524-9529
Single‐molecule magnets comprising one spin center represent a fundamental size limit for spin‐based information storage. Such an application hinges upon the realization of molecules possessing substantial barriers to spin inversion. Axially symmetric complexes of lanthanides hold the most promise for this due to their inherently high magnetic anisotropies and low tunneling probabilities. Herein, we demonstrate that strikingly large spin reversal barriers of 216 and 331 cm?1 can also be realized in low‐symmetry lanthanide tetraphenylborate complexes of the type [Cp*2Ln(BPh4)] (Cp*=pentamethylcyclopentadienyl; Ln=Tb ( 1 ) and Dy ( 2 )). The dysprosium congener showed hysteretic magnetization data up to 5.3 K. Further studies of the magnetic relaxation processes of 1 and 2 under applied dc fields and upon dilution within a matrix of [Cp*2Y(BPh4)] revealed considerable suppression of the tunneling pathway, emphasizing the strong influence of dipolar interactions on the low‐temperature magnetization dynamics in these systems. 相似文献
653.
Amin Said Amin Prof. Dr. Dr. Dietmar Lerche Ahammed Suhail Odungat Sven Uwe Boehm Dr. Thomas Koch Dr. Fatih Özcan Prof. Dr. Doris Segets 《ChemCatChem》2024,16(6):e202301393
Hansen Solubility Parameters (HSP), viewed in the context of similarity whenever dispersion is focused, offer valuable insights into the surface characteristics of nanoparticles. However, existing methods for determining HSP via the sedimentation of nanoparticles require multiple probe liquids, resulting in time-consuming, costly experiments with potential health risks. To address this, we developed a two-step strategy that enables a systematic selection of liquids. The key element of the approach is to first identify the rough location of the Hansen sphere in the three-dimensional Hansen space using a well-chosen set of probe liquids of different polarities and chemical structures. Then, depending on the outcome of the first step, a particular choice of liquids is made for the final HSP determination. Taken together, the introduced procedure reduces the amount of required liquids for experiments from currently more than ten to a maximum of seven chosen based on a well-defined, coherent methodology. Validation was performed on carbon black, non-pigmentary nano-scale titania, silicon/carbon composites, and lanthanum cobaltite particles, i. e., relevant materials that are commonly utilized in fuel cells, batteries, cyclohexene oxidation, catalytic combustion, photocatalysis, and heterogeneous Fenton reactions. The study showcases the potential to save time, costs, and efficiently determine HSP values in a comparable manner. 相似文献
654.
655.
Shiwei Tao Dr. Baris Demir Dr. Ardeshir Baktash Yutong Zhu Dr. Qingbing Xia Prof. Yalong Jiao Yuying Zhao Dr. Tongen Lin Dr. Ming Li Dr. Miaoqiang Lyu Prof. Ian Gentle Prof. Lianzhou Wang Dr. Ruth Knibbe 《Angewandte Chemie (International ed. in English)》2023,62(39):e202307208
The irreversibility of anion intercalation-deintercalation is a fundamental issue in determining the cycling stability of a dual-ion battery (DIB). In this work, we demonstrate that using a partially fluorinated carbonate solvent can drive a beneficial fluorinated secondary interphase layer formation. Such layer facilitates reversible anion (de−)intercalation processes by impeding solvent molecule co-intercalation and the associated graphite exfoliation. The enhanced reversibility of anion transport contributes to the overall cycling stability for a Zn-graphite DIB—a high Coulombic efficiency of 98.5 % after 800 cycles, with an attractive discharge capacity of 156 mAh g−1 and a mid-point discharge voltage of ≈1.7 V (at 0.1 A g−1). In addition, the formed fluorinated secondary interphase suppresses the self-discharge behavior, preserving 29 times of the capacity retention rate compared to the battery with a commonly used carbonate solvent, after standing for 24 hours. This work provides a simple and effective strategy for addressing the critical challenges in graphite-based DIBs and contributes to fundamental understanding to help accelerate their practical application. 相似文献
656.
Yılmazoğlu Mesut Bayıroğlu Fatih Erdemi Hamit Abaci Ufuk Guney H. Yuksel 《Journal of Solid State Electrochemistry》2023,27(5):1143-1154
Journal of Solid State Electrochemistry - In this study, polymeric membranes composed of ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate supported sulfonated poly(ether ether... 相似文献