全文获取类型
收费全文 | 242篇 |
免费 | 4篇 |
国内免费 | 1篇 |
专业分类
化学 | 124篇 |
晶体学 | 4篇 |
力学 | 1篇 |
数学 | 15篇 |
物理学 | 103篇 |
出版年
2022年 | 1篇 |
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 7篇 |
2014年 | 5篇 |
2013年 | 15篇 |
2012年 | 14篇 |
2011年 | 19篇 |
2010年 | 11篇 |
2009年 | 13篇 |
2008年 | 14篇 |
2007年 | 12篇 |
2006年 | 3篇 |
2005年 | 10篇 |
2004年 | 13篇 |
2003年 | 16篇 |
2002年 | 9篇 |
2001年 | 7篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1975年 | 1篇 |
1954年 | 1篇 |
1916年 | 2篇 |
排序方式: 共有247条查询结果,搜索用时 15 毫秒
1.
2.
Lucas J. M. F. Prezas P. R. Soreto Teixeira S. Ferreira N. M. Sales A. J. M. Melo B. M. G. Graça M. P. F. 《Journal of Sol-Gel Science and Technology》2021,98(3):580-592
Journal of Sol-Gel Science and Technology - Lithium ferrite (LiFe5O8) in the cubic crystal system is a very important and versatile material for several technological applications as it possesses... 相似文献
3.
4.
Brian C. Sales V. O. Garlea M.B. Stone M. D. Lumsden S. E. Nagler D. Mandrus 《哲学杂志》2020,100(10):1204-1210
ABSTRACTSingle crystals of the underscreened Kondo ferromagnet Yb14MnSb11 were investigated using polarised neutron diffraction and magnetisation measurements. The magnitude and direction of the magnetisation at each of the 9 distinct crystallographic sites was measured using polarised neutron diffraction. A large moment of close to 4.2?μB was found at the unique Mn site. A compensating antiferromagnetic moment of ≈?0.5?μB was found to be distributed uniformly among the remaining Yb and Sb sites, which was not expected from a previous theoretical calculation. The compensating magnetisation, however, is consistent both in size and magnitude with the expected Kondo screening cloud. 相似文献
5.
The use of light front coordinates in quantum field theories (QFT) always brought some problems and controversies. In this work we explore some aspects of its formalism with respect to the employment of dimensional regularization in the computation of the photon’s self-energy at the one-loop level and how the fermion propagator has an important role in the outcoming results. 相似文献
6.
Herman S. Mansur Nelício F. de Sales Alexandra A. P. Mansur 《Surface and interface analysis : SIA》2011,43(11):1423-1429
In this work is reported the preparation and characterization of 5,10,15,20‐tetraphenylporphyrin (H2TPP) films at the water‐air interfaces. The surface pressure‐area isotherms (π‐A) and UV‐Vis spectroscopy were used to investigate the effect of the spreading methods and parameters on the porphyrin monolayer formation. Also, Langmuir‐Blodgett (LB) and Langmuir‐Schaefer (LS) films were deposited onto glass substrates in order to study the conformation changes in porphyrin molecular packing. Quartz crystal microbalance (QCM) was utilized as the active solid substrate for the development of the NO2 gas sensor based on the H2TPP molecular films. The results of π‐A curves have clearly shown the significant contribution of the preparation methods and processing parameters on the conformation of porphyrin molecular films. The UV‐Vis spectroscopy results using polarized absorption dichroism have indicated different molecular packing for porphyrin films deposited by LB and LS methods, with relative tilted angles of 50° ± 5° and 35° ± 5°, respectively. Moreover, the QCM response has given strong evidence that H2TPP porphyrin molecular films have performed as NO2 chemsensor. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
7.
8.
José Roberto dos Santos Politi Paulo Roberto Rodrigues de Matos Maria José Araújo Sales 《Journal of Thermal Analysis and Calorimetry》2013,111(2):1437-1442
Demand for lubricating oils is increasing in the growing Brazilian economy. The use of vegetable bases in exchange of minerals can bring socio-economic and environmental benefits for Brazil. The purpose of this study is to compare the thermal and oxidative stability of vegetable oils related to the bases commonly used as lubricants. In this study, thermogravimetric analysis of castor oil, cotton oil, macauba’s almond oil, passion oil, paraffinic mineral oil, naphthenic oil (NH-140) and synthetic oil (Etro) was performed in inert and oxidative atmosphere to study the thermal and oxidative degradation of the vegetable oils related to the most common lubricants’ oils base. These oils’ oxidation stability were determined by standard procedures (ISO 6886). The use of mineral oil’s additives in these vegetable oils was tested to verify the viability of these additives to improve the oxidative stability of the vegetable oils. The castor oil and the cotton oil presented results of thermal analysis similar to the mineral and synthetic bases values. The castor oil was the only vegetable oil that showed a great oxidative stability. All other vegetable oils had their oxidative stability significantly increased by the additives. 相似文献
9.
10.
A. V. Myshlyavtsev J. L. Sales G. Zgrablich V. P. Zhdanov 《Journal of statistical physics》1990,58(5-6):1029-1039
Thermal desorption spectra are calculated for a one-dimensional chain and for a two-dimensional square lattice using the transfer-matrix technique and Monte Carlo simulations. Lateral interactions of adsorbed particles cause a splitting of spectra. The repulsive three-body interactions are shown to lead to an inequality of the integral intensities of the thermal desorption peaks. 相似文献