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211.
Yajuan Liu Daoming Zhu Xianjun Zhu Gaoke Cai Jianhua Wu Muqing Chen Pingwu Du Yongshun Chen Wei Liu Shangfeng Yang 《Chemical science》2020,11(42):11435
Few-layer black phosphorus (BP) nanosheets show potential application in biomedicine such as photodynamic therapy (PDT), and are therefore commonly used in anticancer therapy and nanomedicine due to being relatively less invasive. However, they suffer from low ambient stability and poor therapeutic efficacy. Herein, C60 was covalently grafted onto the edges of BP nanosheets, and the resultant BP-C60 hybrid was applied as a novel endocytosing photosensitizer, resulting in not only significantly enhanced PDT efficacy relative to that of the pristine BP nanosheets, but also drastically improved stability in a physiological environment, as confirmed by both in vitro and in vivo studies. Such improved stability was due to shielding effect of the stable hydrophobic C60 molecules. The enhanced PDT efficacy is interpreted from the photoinduced electron transfer from BP to C60, leading to the promoted generation of ˙OH radicals, acting as a reactive oxygen species (ROS) that is effective in killing tumor cells. Furthermore, the BP-C60 hybrid exhibited low systemic toxicity in the major organs of mice. The BP-C60 hybrid represents the first BP-fullerene hybrid nanomaterial fulfilling promoted ROS generation and consequently enhanced PDT efficacy.Covalently grafting C60 molecules onto black phosphorus (BP) nanosheets improves their tumor inhibition rate from 36.6% to 88.2%. 相似文献
212.
The electric quadrupole shift is presently the most significant source of uncertainty on the systematic shifts for several single-ion optical frequency standards. We present a simple method for cancelling this shift based on measurements of the Zeeman spectrum of the clock transition. This method is easy to implement and yields very high cancellation levels. A fractional uncertainty of 5 x 10(-18) for the canceled quadrupole shift is estimated for a measurement of the absolute frequency of the 5s (2)S(1/2)-4d (2)D(5/2) clock transition of 88Sr+. 相似文献
213.
Ivashchenko V. I. Pogrebnjak A. D. Sobol’ O. V. Skrynskii P. L. Rogoz V. N. Meilekhov A. A. Dub S. N. Kupchishin A. I. 《Physics of the Solid State》2015,57(8):1642-1646
Physics of the Solid State - Nanocomposite Nb-Al-N films prepared by magnetron sputtering have been studied. It has been found that, in the films, there are two stable crystalline structural... 相似文献
214.
C100 is Converted into C94Cl22 by Three Chlorination‐Promoted C2 Losses under Formation and Elimination of Cage Heptagons 下载免费PDF全文
Dr. Ilya N. Ioffe Prof. Dr. Shangfeng Yang Song Wang Prof. Dr. Erhard Kemnitz Prof. Dr. Lev N. Sidorov Prof. Dr. Sergey I. Troyanov 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(13):4904-4907
Chlorination of the C100(18) fullerene with a mixture of VCl4 and SbCl5 gives rise to branched skeletal transformations affording non‐classical (NC) C94(NC1)Cl22 with one heptagon in the carbon cage together with the previously reported C96(NC3)Cl20 with three heptagons. The three‐step pathway to C94(NC1)Cl22 starts with two successive C2 losses of 5:6 C?C bonds to give two cage heptagons, whereas the third C2 loss of the 5:5 C?C bond from a pentalene fragment eliminates one of the heptagons. Quantum‐chemical calculations demonstrate that the two unusual skeletal transformations—creation of a heptagon in C96(NC3)Cl20 through a Stone–Wales rearrangement and the presently reported elimination of a heptagon through C2 loss—are both characterized by relatively low activation energy. 相似文献
215.
Inside Cover: An Expanded Family of Dysprosium–Scandium Mixed‐Metal Nitride Clusterfullerenes: The Role of the Lanthanide Metal on the Carbon Cage Size Distribution (Chem. Eur. J. 15/2015) 下载免费PDF全文
216.