The research work as an important part of modern school education

It is traditionally considered that the scientific research work is carried out in higher education institutions only. But the development of types and ways of thinking happens much more earlier. That's why the research work should be an important part of school education. Every year students of schools of our town take part in a theoretical and practical conference where they are to present their research projects in different subjects. In this article we'll speak about the research projects in English and give a guide on what the research project isТрадиционно считается, что научно-исследовательская деятельность осуществляется в ВУЗе, но формирование типов и стилей мышления происходит значительно раньше, поэтому научно-исследовательская работа должна стать неотъемлемой частью школьного образования. Каждый год обучающиеся школ нашего города принимают участие в научно-практической конференции, на которой они должны представить научно-исследовательский проект по разным предметам. В статье мы рассматриваем, что представляет собой научно-исследовательский проект по предмету «Английский язык

The Fermi surface reconstruction in stripe phases of cuprates

Mean-field study of the stripe structures is conducted for a hole-doped Hubbard model. For bond-directed stripes, the Fermi surface consists of segments of an open surface and the boundaries of the hole pockets which appear in the diagonal region of momenta under certain conditions. Segments of the first type are due to one-dimensional bands of states localized on the domain walls. The relation of bands to the doping and temperature dependences of the Hall constant is discussed. In connection with the observation of quantum magnetic oscillations, a systematic search for the electron pockets has been carried out. It is shown that the formation of such pockets in bilayer models is quite possible.Comment: 4 pages, 3 figure

Proton configurations in the hydrogen bonds of KH2PO4 as seen by resonant x-ray diffraction

KH2PO4 (KDP) belongs to the class of hydrogen-bonded ferroelectrics, whose paraelectric to ferroelectric phase transition is driven by the ordering of the protons in the hydrogen bonds. We demonstrate that forbidden reflections of KDP, when measured at an x-ray absorption edge, are highly sensitive to the asymmetry of proton configurations. The change of average symmetry caused by the "freezing" of the protons during the phase transition is clearly evidenced. In the paraelectric phase, we identify in the resonant spectra of the forbidden reflections a contribution related to the transient proton configurations in the hydrogen bonds, which violates the high average symmetry of the sites of the resonant atoms. The analysis of the temperature dependence reveals a change of relative probabilities of the different proton configurations. They follow the Arrhenius law, and the activation energies of polar and Slater configurations are 18.6 and 7.3 meV, respectively

The influence of mechanochemical modification on prevention of toxic ability of humic acids towards phenanthrene in aquatic environment

Целью работы является количественная оценка взаимодействия фенантрена с модифицированными гуминовыми кислотами в водной среде. Изменение структуры и свойств ГК после модификации было изучено методами ИК-, {1}Н ЯМР - спектроскопии и потенциометрического титрования. Доказано что применение тиомочевины в качестве модифицирующего агента значительно увеличивает связывающую способность гуминовых кислот по отношению к фенантрену

The influence of mechanochemical modification on prevention of toxic ability of humic acids towards phenanthrene in aquatic environment

The aim of the research work is to quantify interaction between phenanthrene with modified humic acids in aquatic environment. The changes in the structure and properties of humic acids after modifications were studied with 1Н NMR spectroscopy and potentiometric titration methods. Our research demonstrates that the application of thiourea as a modified agent increases the binding capacity of humic acids towards phenanthrene

A numerical study of resonant regimes near the points of codimension-2 bifurcation in Couette-Taylor problem

The investigation of codimension-2 bifurcations in the systems with cylindric symmetry enables us to find out new types of secondary regimes branching off from the symmetric regimes. The central manifold approach combined with the reduction to the normal form lead to the so called amplitude systems.These ODE systems describe the nonlinear interaction between the neutral modes and include always several nonlinear terms due to so called intrinsic resonances. However, sometimes additional resonances appear. We present the results of investigation of interaction between two nonaxisymmetric neutral modes in the Couette--Taylor problem in the intrinsic resonances case (Res 0) and one of six additional resonances (Res 3)

Biomechanical control-based locomotor function rehabilitation technology for children with cerebral palsy

Locomotor functions of children with special needs by the example of infantile cerebral palsy have bee

Controlling the topological sector of magnetic solitons in exfoliated Cr1/3_{1/3}NbS2_2 crystals

We investigate manifestations of topological order in monoaxial helimagnet Cr$_{1/3}$NbS$_2$ by performing transport measurements on ultra-thin crystals. Upon sweeping the magnetic field perpendicularly to the helical axis, crystals thicker than one helix pitch (48 nm) but much thinner than the magnetic domain size ($\sim$1 $\mu$m) are found to exhibit sharp and hysteretic resistance jumps. We show that these phenomena originate from transitions between topological sectors with different number of magnetic solitons. This is confirmed by measurements on crystals thinner than 48 nm --in which the topological sector cannot change-- that do not exhibit any jump or hysteresis. Our results show the ability to deterministically control the topological sector of finite-size Cr$_{1/3}$NbS$_2$ and to detect inter-sector transitions by transport measurements.Comment: 7 pages, 8 figure