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排序方式: 共有227条查询结果,搜索用时 15 毫秒
1.
Previously unknown compounds AI
I(BUO5)2·nH2O (AI
I = Mg, Ca, Sr, Ba; n = 0-7) were synthesized. Their structure and thermal decomposition were studied by X-ray diffraction, IR spectroscopy, and thermal analysis. 相似文献
2.
Procedures for the synthesis of Li4[UO2(CO3)3]·1.5H2O, Na4[UO2(CO3)3], K4[UO2(CO3)3], (NH4)4[UO2(CO3)3], and K3Na[UO2(CO3)3] were optimized. The structures of these compounds and their thermolysis were studied by X-ray diffraction, precision IR spectroscopy, and thermal analysis. The standard enthalpies of formation of these compounds at 298.15 K were determined by reaction calorimetry. 相似文献
3.
The optimum procedures for synthesis of UO2CO3 and Na4[UO2(CO3)3] were developed. The structures of these compounds and their thermal decomposition were studied by X-ray diffraction, precision IR spectroscopy, and thermography. The standard enthalpy of formation of crystalline Na4[UO2(CO3)3] at 298.16 K was determined to be -4010.0±8.0 kJ mol-
1. 相似文献
4.
A. N. Agafonov B. O. Volodkin S. G. Volotovsky A. K. Kaveev B. A. Knyazev G. I. Kropotov K. N. Tykmakov V. S. Pavelyev E. V. Tsygankova D. I. Tsypishka Yu. Yu. Choporova 《Optical Memory & Neural Networks》2014,23(3):185-190
Binary silicon-based diffractive optical element (DOE)—Gaussian-to-Square focuser (diameter of aperture is 30 mm) for the terahertz spectral range has been designed and characterized using terahertz radiation of the Novosibirsk Free Electron Laser (NovoFEL) at the wavelength of 141 μm. The preliminary experiments have demonstrated feasibility of application of binary silicon DOE for focusing of terahertz radiation into pre-given focal domain. 相似文献
5.
A. V. Knyazev N. G. Chernorukov M. S. Sheiman S. C. Ponomarev Yu. S. Sazhina 《Radiochemistry》2006,48(5):434-436
The standard enthalpy of formation of crystalline Ba2Sm2/3UO6 at 298.15 K, ?3040.0±7.5 kJ mol?1, was determined by reaction calorimetry. The heat capacity of the compound in the range 80–300 K was measured by adiabatic vacuum calorimetry, and its thermodynamic functions were calculated. Its standard entropy of formation at 298.15 K is ?592.5±1.0 J mol?1 K?1, and the Gibbs energy of formation at 298.15 K, ?2863.5±8.0 kJ mol?1. The standard thermodynamic functions of the reactions of the Ba2Sm2/3UO6 synthesis were calculated and discussed. 相似文献
6.
N. G. Chernorukov A. V. Knyazev M. S. Sheiman S. C. Ponomarev T. A. Gur’eva 《Radiochemistry》2006,48(5):437-440
The standard enthalpy of formation of crystalline Lu(HSiUO6)3 · 10H2O at 298.15 K, ?10668.0±16.0 kJ mol?1, and the standard enthalpy of its dehydration were determined by reaction calorimetry. The heat capacity of this compound in the range 80–300 K was measured by adiabatic vacuum calorimetry, and its thermodynamic functions were calculated. The standard entropy of formation at 298.15 K is ?3812.9±1.2 J mol?1 K?1, and the standard Gibbs energy of formation at 298.15 K, ?9531.0±16.5 kJ mol?1. The standard thermodynamic functions of the reactions of the synthesis of lutetium uranosilicate were calculated and discussed. 相似文献
7.
A synthetic analog of soddyite mineral, (UO2)2SiO4·2H2O, was prepared by hydrolyzing ammonium uranosilicate under hydrothermal conditions. The germanium-containing structural analog of soddyite, (UO2)2GeO4·2H2O, was synthesized by precipitation from solution. The compound UO2(BO2)2 was prepared by reaction with molten boron oxide. The structures and properties of the compounds prepared were studied by X-ray diffraction analysis, IR spectroscopy, and thermography. The enthalpies of formation of the compounds were determined by adiabatic reaction calorimetry. 相似文献
8.
V. E. Korsukov S. A. Knyazev A. V. Ankudinov M. M. Korsukova B. A. Obidov 《Technical Physics Letters》2014,40(3):249-251
Changes in the atomic structure and surface morphology of a recrystallized molybdenum foil under the action of uniaxial tension in ultrahigh vacuum have been studied by low -energy electron diffraction (LEED) and atomic-force microscopy (AFM). It is established that uniaxial tension of the foil surface, which consists of separate blocks of dominating (100) face with 1 × 1 structure, leads to a local destruction of this face and the rotation of blocks. AFM topographs of various regions on the surface of fractured samples have been obtained. The variation of the LEED patterns agrees well with the evolution of the surface relief measured by AFM. 相似文献
9.
The results of studying the phase transformations, the texture formation, and the anisotropy of the mechanical properties in Al–Cu–Li and Al–Mg–Li alloys are generalized. A technique and equations are developed to calculate the amounts of the S1 (Al2MgLi), T1 (Al2CuLi), and δ' (Al3Li) phases. The fraction of the δ' phase in Al–Cu–Li alloys is shown to be significantly higher than in Al–Mg–Li alloys. Therefore, the role of the T1 phase in the hardening of Al–Cu–Li alloys is thought to be overestimated, especially in alloys with more than 1.5% Li. A new model is proposed to describe the hardening of Al–Cu–Li alloys upon aging, and the results obtained with this model agree well with the experimental data. A texture, which is analogous to that in aluminum alloys, is shown to form in sheets semiproducts made of Al–Cu–Li and Al–Mg–Li alloys. The more pronounced anisotropy of the properties of lithium-containing aluminum alloys is caused by a significant fraction of the ordered coherent δ' phase, the deformation mechanism in which differs radically from that in the solid solution. 相似文献
10.
A. D. Zorin E. N. Karataev V. F. Zanozina A. V. Knyazev E. V. Zhebryakov 《Petroleum Chemistry》2012,52(4):245-252
The method of thin-film thermal cracking of acid tar to manufacture liquid fuel and coke or liquid fuel and asphaltic binders has been developed. Differential thermal analysis of acid tar samples has been performed. A model of the thin-layer thermal cracking of acid tar and an algorithm for calculating the engineering parameters of the process have been proposed. 相似文献