Study of the technological limitations of photolithography for the relief surface of a SOI wafer during formation of the three-dimensional micromechanical structure of an integral tensoconverter

The results of studying the formation of the three-dimensional micromechanical structure of an integral tensoconverter are presented. The technological restrictions on contact photolithography over the relief structure formed on the device layer of the silicon-on-insulator wafer are analyzed. The effect of the design parameters (the frame height and the width of the frame slit) are described.     

Dielectric studies of a bioactive tetramic acid and its complexes with Cu(II) and Co(II)

The 3-acyl tetramic acids constitute a growing class of natural products displaying a range of biological activities. The g , g ' tricarbonyl moiety present in the 3-acyl tetramic acid provides a suitable site for bidentate complexation to a metal, which increases the biological activity. For the dielectric study of N-acetyl-3-butanoyl tetramic acid and a series of its complexes with Cu(II) and Co(II) in symmetric and asymmetric forms, we used the Thermally Stimulated Depolarization Currents (TSDC) technique. The drastic decrease of the intensity of the TSDC peaks of the symmetric and asymmetric complexes, compared to the above mentioned ligand, suggested that the polarizability of the side groups is considerably reduced. This result enhances the proposed complexation mode of the ligand through oxygen next to carbons 3 and 4 of the 5-member ring.     

On the problem of the stability of pyramidal structures on bombarded copper surfaces

The morphological evolution of pyramids, developed on bombarded copper surfaces, as a function of consecutive doses of 12 keV Kr—ions from 2.4 × 10¹⁶ up to 3 × 10¹⁶ ions/cm², has been studied. In disagreement with many previous studies, apparently based on a limited choice of doses which were sometimes not in sequence, we found that the pyramids disappeared at high enough doses. Pyramids are therefore not an equilibrium structure.     

Synthesis and Photoluminescent Properties of Lanthanides Acetoacetanilide Complexes

This work reports on the photoluminescent properties of three new lanthanide complexes with acetoacetanilide (aaa), a β-diketonate ligand. The complexes have the general molecular formulae [RE(aaa)₃(H₂O)], they are soluble in organic solvents such as ethanol and chloroform and insoluble in water. The energy of the triplet state was determined at about 4,700 cm^?1 higher than the ⁵D₄ emitting level of the Tb(III) ion, leading to an absolute quantum yield of 22 % for the [Tb(aaa)₃(H₂O)] complex. The photoluminescent properties were studied and the luminescence parameters of the [Eu(aaa)₃(H₂O)] complex were experimentally determined. The photostabilities of the complexes under continuous UV irradiation were measured and the data indicate low stability of the [Tb(aaa)₃(H₂O)] complex when the system is excited at the band attributed to energy transfer from the ligand to terbium(III) ion. However, its photostability is significantly improved under inert atmosphere.     

Properties of MnSb/GaAs heterostructures

MnSb layers are deposited on GaAs(100) via the laser ablation of Mn and Sb targets. The magnetic field dependences of the transverse Kerr effect display magnetic anisotropy and magnetization jumps. Measurements of the Hall effect reveal a hysteresis loop at temperatures of up to 300 K.     

Using synchrotron radiation X-ray fluorescence analysis in a chemotaxonomic study of some Siberian species of the genus Pentaphylloides hill

The elemental composition of four species of the genus Pentaphylloides Hill is determined by means of synchrotron radiation X-ray fluorescence analysis (SRXRF). Each of the studied species is characterized by specific concentrations of elements that are typical of it and can be used in a comparative analysis of other species and be included in a corresponding database. In the case of P. fruticosa and P. x mandshurica, a high content of microelements is observed in all organs that distinguishes them from other species.     

Bulk viscosity of quark-gluon matter in a magnetic field

On the basis of low-energy QCD theorems, the bulk viscosity ζ(T, µ, H) is expressed in terms of basic thermodynamic quantities that characterizes quark-gluon matter at finite temperature and a finite baryon density in a magnetic field. Various limiting cases are considered.     

Quartet states of the lepton sector

A holistic study of the lepton sector is fulfilled in the framework of rigorous restrictions by five input suppositions. All leptons are divided into three classes on the structure of their equations. They are singlets, doublets and quartets. The quartet states are the most interesting among them from the point of view of their properties and possible physical interpretations.     

Specific features of the crystal structure and magnetic properties of the DyFeTi2O7 compound

Results of studying the specific features of formation of the crystal structure and distribution of iron cations over the sites in the DyFeTi₂O₇ compound have been presented and the comparison with the GdGaTi₂O₇ isostructural compound has been performed. The atomic disorder in the distribution of the Fe³⁺ ions over structural sites in the DyFeTi₂O₇ compound is confirmed by the Mössbauer spectroscopy and X-ray diffractometry. The results of magnetic measurements in the low-temperature region have revealed an inflection point in the temperature dependence of the magnetic moment and its dependence on the magnetic prehistory of the sample. The obtained experimental data suggest that there is a spin glass state with freezing point T _f = 6 K in the DyFeTi₂O₇ compound.