Diagrammatic method for theory of magnetic and resistive properties of manganites

Effective field theory of magnetic and resistive properties of manganites with account of strong Hund exchange coupling and electron-phonon interactions has been evolved under the strong Hund coupling condition. In parallel with Lang-Firsov unitary transformation of the zeroth Hamiltonian, we have realized the diagonalization of Hund's Hamiltonian neglecting the upper triplet. The diagram techniques taking into account the quantum spin fluctuations of lower quintet and hole state with spin S=3/2 was developed. The magnetic structure of the ground state and an influence of electron-phonon interaction have been analyzed using the first nonvanishing approximation of perturbation theory. The calculated temperature dependence of resistivity agrees well with experimental data including these obtained in applied magnetic field.Comment: 44 pages, 14 figure

ULTRASOUND FEATURES OF CERVICAL SPINE IN HEALTHY PEOPLE

Aim. In this research, we aimed to study echographic characteristics and normal sizes of the vertebrae and intervertebral discs of the cervical region in healthy individuals.Materials and methods. On the material of 45 healthy volunteers, normal echographic characteristics of the cervical spine were studied using Toshiba Aplio 500 and Toshiba Aplio XG (Japan) scanners equipped with 3.5–5.0 MHz convex sensors and 7.5–12.0 MHz linear sensors.Results. It is found that ultrasound examination from the anterior-lateral access to the right and left allows the C3–C7 vertebral body surfaces facing the sensor to be visualized and their interposition and condition to be evaluated. A new echoanatomical reference point for ultrasonic identifi cation of the level of the cervical vertebra is proposed based on the visualization during the transverse scanning of the carotid artery bifurcation, which corresponds to the C3–C4 intervertebral disc level. The information capacity of the proposed echoanatomical criterion exceeds that for the traditional anatomical criterion used for the C7 vertebra along the sternoclavicular joint by 15.6 ± 5.4%. It is revealed that ultrasound examination provides for a satisfactory visualization of intervertebral discs at a level from C3–C4 to C7–Th1 in the longitudinal and transverse projections, as well as the evaluation of their echostructure and height measurement. The minimum, maximum and average values of the height of intervertebral discs at different levels are given; their dependence on gender, height and body weight of the examined persons is analyzed.Conclusion. It is established that ultrasound examination from the anterior-lateral access is an informative method for investigating vertebral structures at the C3–C7 level. The proposed echoanatomical reference point for C3 and C4 vertebrae allows the ultrasonic identifi cation of the cervical vertebra level to be improved by 15.6 ± 5.4%. The height of the intervertebral disc in healthy persons averages 4.38 ± 0.51 mm and signifi cantly nonlinearly increases from the C3–C4 to C7–Th1 level

The program complex for cross-compiling of models of virtual laboratories in physics to Android platform

The goal of the work is developing software of virtual laboratories in physics which are used in Online Contest in Physics. Online Contest provides a unique opportunity for assessment of the practical application of student knowledge. It is achieved by means of models of virtual laboratories in Physics, simulating a real physical experiment. The project so far has not been cross-platform and has not worked on some popular platforms (Android, iOS). We develop the program complex for the cross-platform compilation of source code of virtual laboratories to Java source codes and Dalvik codes for the Android platform

The first quadrupole excitations in spherical nuclei and nuclear pairing

Excitation energies and transition probabilities of the first 2+ excitations in even lead, tin and nickel isotopes are calculated within the self-consistent Theory of Finite Fermi Systems based on the Energy Density Functional by Fayans et al. A reasonable agreement with available experimental data is obtained. The effect of the density dependence of the effective pairing interaction is analyzed in detail by comparing results obtained with volume and surface pairing. The effect is found to be noticeable, especially for the 2+ energies which are systematically higher at 200-300 keV for the volume paring as compared with the surface pairing case, the latter being in a better agreement with the data.Comment: Presented at International Conference on Nuclear Structure and Related Topics, Dubna, July 2 - 7, 201

Tratment of tendon contractures with distraction method

Over the past 30 years in the treatment of contractures of the joints of fingers used hinged-distraction apparatus. However, there remain several unresolved issues, namely: Is it possible to eliminate contraction through consistent stretching of soft tissues at different joints? During the period from 2000 to 2010 distraction technique used in the treatment of 136 patients with post­traumatic scar tenogennymi contractures of fingers. Long-term results of treatment were studied in 85 patients (112 fingers). Application of this approach allowed to recover with minimal traumatic finger movements, provided an opportunity to eliminate one stage of contractures and receive positive functional results in 94.3% of cases. Treatment of patients with post-traumatic contractures of the fingers tenogennymi should be carried out comprehensively and strictly differentiated, continuously until a persistent restoration of function. Development of motion in joints of fingers after the removal of the apparatus of external fixation should be performed to restore the strength of the soft tissues.На протяжении последних 30 лет в лечении контрактур суставов пальцев кисти применяются шарнирно-дистракционные аппараты. Однако остается нерешенным целый ряд вопросов, а именно: можно ли устранить контрактуру посредством последовательного растяжения мягких тканей на уровне разных суставов? За период с 2000 года по 2010 год дистракционный метод использован в лечении 136 больных с рубцовыми посттравматическими теногенными контрактурами пальцев кисти. Отдаленные результаты лечения изучены у 85 больных (112 пальцев). Применение данного подхода позволило с минимальной травматичностью восстановить движения пальцев, обеспечило возможность одноэтапного устранения контрактур и получать положительные функциональные результаты в 94,3% случаев. Лечение больных с посттравматическими теногенными контрактурами пальцев должно проводиться комплексно, строго дифференцированно, непрерывно до стойкого восстановления функции. Разработка движений в суставах пальцев после снятия аппарата внешней фиксации должна проводиться до восстановления прочности мягких тканей

Analysis of robustness of homogeneous systems with time delays using Lyapunov-Krasovskii functionals

International audienceThe paper is devoted to stability analysis of homogeneous time-delay systems applying the Lyapunov-Krasovskii theory, and a generic structure of the functional is given that suits for any homogeneous system of non-zero degree (and can also be used for any dynamics admitting a homogeneous approximation). The obtained stability conditions are utilized to evaluate the domain of attraction for the delayed twisting control algorithm

Relevance and Economic Feasibility of Using Passive House Technology in the Ekaterinburg

В работе рассматриваются перспективы строительства зданий по технологии пассивного дома в Екатеринбурге. Приводятся ключевые параметры подобного дома и анализируется его актуальность при текущих ценах на энергоносители.The paper discusses the prospects for the construction of buildings using passive house technology in the conditions of Ekaterinburg. The key parameters of such a house are given and its relevance is analyzed at current energy prices

Ультразвуковая визуализация инородных тел мягких тканей

Objective: to study the capabilities of ultrasound imaging in the diagnosis of soft tissue foreign bodies.Materials and methods. 93 patients with a preliminary diagnosis of foreign bodies soft tissue ultrasound examination performed on the, HDI 5000 and the Aplio 500scanners;transducer elected respectively scan depth of interest in the location area. To improve the ultrasound diagnostics of foreign bodies used the original method of initializing, Twinkling artifact. Identified foreign bodies were extracted intraoperatively – in 11 (11.8%) patients, either through the wound channel – in 75 (80.6%). Diagnosis of foreign body was expelled in 7 (7.5%) patients (own bone sequesters (4) and parasitic invasion (dirofilariasis) (3)).Results. Ultrasound reveals foreign bodies, including not determined radiographically, to differentiate them from other disease states with similar clinical picture. Echographic characteristics in conjunction with the study history presumably prevented to judge the foreign body material (wood, glass, bone, gauze, latex etc.).Optimization of diagnosis of foreign bodies contributed to the use of the original method of initiation, Twinkling artifact. Ultrasound also allows to evaluate the localization of foreign bodies and their relative positions to the surrounding anatomical and pathological structures, identify the signs of inflammation, abscess formation.Conclusion. Studies have shown high information ultrasonography in the diagnosis of foreign bodies, including not determined radiographically. The data can be the basis for the differentiated choice of medical tactics, in particular, the establishment of indications for surgical or minimally invasive treatment.Цель исследования: изучение возможностей ультразвуковой визуализации в диагностике инородных тел мягких тканей.Материал и методы. 93 пациентам с предварительным диагнозом инородных тел мягких тканей выполнено ультразвуковое исследование (УЗИ) на сканерах HDI 5000 и Aplio 500; датчики избирали соответственно глубине расположения зоны интереса. Для улучшения ультразвуковой диагностики инородных тел использовали оригинальный способ инициализации твинклинг-артефакта. Выявленные инородные тела были извлечены интраоперационно – у 11 (11,8%) пациентов либо через раневой канал – у 75 (80,6%). Диагноз инородного тела был исключен у 7 (7,5%) пациентов (собственные костные секвестры (4) и паразитарная инвазия (дирофилляриоз) (3)).Результаты. УЗИ позволяло выявить инородные тела, в том числе не определяемые рентгенологически, дифференцировать их с другими патологическими состояниями со сходной клинической картиной. Эхографические характеристики в сочетании с изуче нием анамнеза позволяли предположительно судить о материале инородного тела (дерево, стекло, кость, марля, латекс и пр.). Оптимизации диагностики инородных тел способствовало применение оригинального способа инициации твинклинг-артефакта. УЗИ позволяло оценить локализацию инородных тел и их взаиморасположение с окружающими анатомическими и патологическими структурами, выявить признаки воспаления, абсцедирования.Заключение. Проведенное исследование показало высокую информативность УЗИ в диагностике инородных тел, в том числе не определяемых рентгенологически. Полученные данные могут быть положены в основу дифференцированного выбора лечебной тактики, в частности установления показаний к оперативному или минимально инвазивному лечению

Quantum phase transitions and thermodynamic properties in highly anisotropic magnets

The systems exhibiting quantum phase transitions (QPT) are investigated within the Ising model in the transverse field and Heisenberg model with easy-plane single-site anisotropy. Near QPT a correspondence between parameters of these models and of quantum phi^4 model is established. A scaling analysis is performed for the ground-state properties. The influence of the external longitudinal magnetic field on the ground-state properties is investigated, and the corresponding magnetic susceptibility is calculated. Finite-temperature properties are considered with the use of the scaling analysis for the effective classical model proposed by Sachdev. Analytical results for the ordering temperature and temperature dependences of the magnetization and energy gap are obtained in the case of a small ground-state moment. The forms of dependences of observable quantities on the bare splitting (or magnetic field) and renormalized splitting turn out to be different. A comparison with numerical calculations and experimental data on systems demonstrating magnetic and structural transitions (e.g., into singlet state) is performed.Comment: 46 pages, RevTeX, 6 figure