Direct observation of monoclinic domains in rhombohedral EuAl3(BO3)4 skeletal microcrystals.
The structural and spectroscopic features of the EuAl3(BO3)4 individual skeletal microcrystals synthesized by a melt solution method have been studied. Their infrared spectra taken from the as-grown microcrystal surfaces mainly contain the lines of the rhombohedral modification of EuAl3(BO3)4 and additional peaks of its monoclinic modification. TEM and X-ray diffraction studies confirm that these additional peaks in the IR spectra belong to the monoclinic C2/c polytype of the EuAl3(BO3)4 compound. We are the first to demonstrate the presence of coherent monoclinic domains in rhombohedral EuAl3(BO3)4 crystals by TEM. Cathodoluminance spectroscopy shows that the microcrystals generate strong emission lines in the range 580–630 nm, and their intensities are strongly influenced by the crystal orientation.
The report presents the results of a comparative analysis of logical and probabilistic safety threats structure modeling techniques. It is shown that general logic probabilistic method using the functional integrity of the scherme, is most preferred for use in the problems of the consolidated risk assessment.
A comparison is made between the structure of 10 high impact papers and 50 desk-rejects. In doing so, authors are offered empirical evidence and insights into why papers that have a high impact not only differ from unsuccessful papers in terms of content, but also their structure. While excellent content is needed for high impact, appropriate structure is also required. Obtaining the appropriate structure is the first and easiest step. The intent of this editorial is to assist authors to recognize and make this important step
The article describes the status of the Lead-in component of a Language for Special Purposes (LSP) electronic textbook module. The paper writers emphasize the significance of Lead-in within the module framework as it stimulates students’ cognitive and communicative activity at a single lesson as well as throughout a set of lessons. Various contents of the Lead-in section which depend on the module topic have been described. It has been proved that the Lead-in section predetermines the students’ further successful study and acquisition of the module material.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.