全文获取类型
收费全文 | 187篇 |
免费 | 1篇 |
专业分类
化学 | 116篇 |
晶体学 | 1篇 |
力学 | 13篇 |
数学 | 18篇 |
物理学 | 40篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 9篇 |
2011年 | 12篇 |
2010年 | 13篇 |
2009年 | 11篇 |
2008年 | 13篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 9篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1970年 | 4篇 |
1968年 | 1篇 |
排序方式: 共有188条查询结果,搜索用时 15 毫秒
61.
N. N. Efimova 《JETP Letters》1998,67(5):346-351
It is established on the basis of an investigation of the temperature dependences of the saturation magnetization σS(T) and the magnetic contribution to the specific heat C
m(T) that in the reentrant region of the x-T diagram (0.9⩽x⩽1.5) of dilute iron spinels Li0.5Fe2.5− x
GaxO4 there exists between the line of Curie points T
C(x) and the line of freezing temperatures T
f(x) another line of first-order phase transitions T
1(x) to a noncollinear ferrimagnetic phase: T
C(x)⩽T
1(x)⩽T
f(x).
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 5, 329–333 (10 March 1998) 相似文献
62.
63.
64.
D. V. Karpinsky I. O. Troyanchuk V. V. Sikolenko V. Efimov E. Efimova M. V. Silibin G. M. Chobot E. Willinger 《Physics of the Solid State》2014,56(11):2263-2268
The crystal structure of solid solutions in the Bi1 ? x Pr x FeO3 system near the structural transition between the rhombohedral and orthorhombic phases (0.125 ≤ x ≤ 0.15) has been studied. The structural phase transitions induced by changes in the concentration of praseodymium ions and in the temperature have been investigated using X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. It has been established that the sequence of phase transformations in the crystal structure of Bi1 ? x Pr x FeO3 solid solutions with variations in the temperature differs significantly from the evolution of the crystal structure of the BiFeO3 compounds with the substitution of other rare-earth elements for bismuth ions. The regions of the existence of the single-phase structural state and regions of the coexistence of the structural phases have been determined in the investigation of the crystal structure of the Bi1 ? x Pr x FeO3 solid solutions. A three-phase structural state has been revealed for the solid solution with x = 0.125 at temperatures near 400°C. The specific features of the structural phase transitions of the compounds in the vicinity of the morphotropic phase boundary have been determined by analyzing the obtained results. It has been found that the solid solutions based on bismuth ferrite demonstrate a significant improvement in their physical properties. 相似文献
65.
N. I. Aleksandrova I. V. Efimova 《Journal of Applied Mechanics and Technical Physics》1992,33(5):717-722
Translated from Prikiadnaya Mekhanika i Tekhnicheskaya Fizika, No. 5, pp. 110–116, September–October, 1992. 相似文献
66.
I. O. Troyanchuk D. V. Karpinsky M. V. Bushinsky M. I. Kovetskaya E. A. Efimova V. V. Eremenko 《Journal of Experimental and Theoretical Physics》2011,113(6):1025-1031
The crystal structure and magnetic and piezoelectric properties of the Bi1 − x
Ca
x
FeO3 − x/2 system (x ≤ 0.2) are studied. The crystal-structure transformations occur in the following sequence: rhombohedral (R3c) polar phase (x ≤ 0.06) → modulated polar phase (0.07 ≤ x ≤ 0.1) → modulated antipolar phase (0.11 ≤ x ≤ 0.14). The modulated polar and antipolar phases are weakly ferromagnetic with a spontaneous magnetization of 0.25 G cm3/g (x = 0.09). In the polar weak ferromagnet with x = 0.09, a uniform piezoelec- tric response 2.5 times stronger than in the initial BiFeO3 compound is detected by the piezoelectric force microscopy. 相似文献
67.
Efimova OV Caia GL Sun Z Petryakov S Kesselring E Samouilov A Zweier JL 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2011,212(1):197-203
Proton-electron double resonance imaging (PEDRI) has been utilized for indirect determination of oxygen concentrations in aqueous samples and living systems. Due to the complexity of the problem, there are seven oxygen related parameters that need to be measured to determine the distribution of oxygen. We present an improved approach in which image intensities from only two PEDRI acquisitions with different EPR irradiation powers are required to determine the distribution of a paramagnetic probe and oxygen in an analyzed sample. This is achieved using three reference samples with known concentrations of a paramagnetic probe and oxygen placed inside the resonator together with the measurement sample. An EPR-off image, which has low signal intensity at low magnetic field (0.02 T) is not required for the calculations, significantly reducing the total time of the experiments and the noise while enhancing the accuracy of these oxygen measurements. The Finland trityl radical was used as the paramagnetic probe and oxygen concentrations could be accurately measured and imaged over the physiological range from 0 to 240 μM. 相似文献
68.
69.
Y. M. Efimova B. Wierczinski S. Haemers A. A. van Well 《Journal of Radioanalytical and Nuclear Chemistry》2005,264(1):91-96
Summary Bovine serum albumin (BSA) and lysozyme (LSZ) were radiolabeled with 125I. Three different methods for protein iodination with 125I were optimized. Parameters like incubation time and ratio of oxidizing agent and amount of protein were established. During protein iodination with 125I, structural damages caused by the introduction of iodine into the protein may occur. These damages depend on the oxidizing agent used and may lead to considerable changes in the protein structure and, hence, their biological activity. Changes in secondary structure of LSZ and BSA were examined by circular dichroism (CD). Enzymatic activity tests were performed with lysozyme to check its biological activity. The Iodo Bead was found the best oxidizing agent for protein iodination. 相似文献
70.
Yu. A. Mirgorod N. A. Efimova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(10):1665-1668
Contact and water-separated hydrophobic interactions accompanying the solution of C6–C8 n-alcohols in water and micellar solutions of sodium dodecyl sulfate were studied by the method of \(\Delta G_{CH_2 }^ \circ \) coupled thermodynamic cycles. The results are discussed in terms of the dualistic model of micelle formation consistent with the rigorous theory of solutions. The theoretical results were in agreement with the experimental \(\Delta G_{CH_2 }^ \circ \) values for the solubilization of alcohols and association numbers. 相似文献