Errors and complications in management of primary long bone tumors in the lower limbs with the Ilizarov transosseous osteosynthesis

Introduction The Ilizarov method of non-free bone plasty has been widely used for management of lower limb long bones after resection of primary tumors. Analysis of errors and complications by using this method is a demanded and relevant task. Purpose We retrospectively studied the errors and complications by using the method of Ilizarov non-free bone toplasty in patients with primary neoplasms in lower limb long bones. Material and methods Rehabilitation of 133 patients with primary tumors of lower limb long bones was analyzed. All of them were treated with the Ilizarov method of compression-distraction osteosynthesis for bridging post-resection defects. Results Our retrospective study revealed organizational, tactical, technical errors and complications, which we observed during clinical and rehabilitation stages. Conclusion Systematization of errors and associated complications allowed us to develop recommendations for their prevention and treatment

Day Plots of Bacterial Magnetite from Sediments of Shira Lake (Khakassia, Russia)

The domain state of magnetite detected in sediments of Shira lake (Khakassia, Russia) was examined by means of magnetic hysteresis. Analysis of experimental data obtained on samples from different parts of bottom sediment cores in terms of Day plots allowed us to conclude that magnetite particles are in the pseudo-single-domain state. This indicates respectively small size of magnetite particles (< 100 nm) and reveals their bacterial origin. Biogenic magnetite buried in the bottom sediments can indicate the climatic changes in the Shira lake level in the Late Holocen

Day Plots of Bacterial Magnetite from Sediments of Shira Lake (Khakassia, Russia)

The domain state of magnetite detected in sediments of Shira lake (Khakassia, Russia) was examined by means of magnetic hysteresis. Analysis of experimental data obtained on samples from different parts of bottom sediment cores in terms of Day plots allowed us to conclude that magnetite particles are in the pseudo-single-domain state. This indicates respectively small size of magnetite particles (< 100 nm) and reveals their bacterial origin. Biogenic magnetite buried in the bottom sediments can indicate the climatic changes in the Shira lake level in the Late Holocen

Synthesis of Co-Ni Alloy Particles with the Structure of a Solid Substitution Solution by Precipitation in a Supercritical Carbon Dioxide

Mixed Co-Ni bimetallic systems with the structure of a solid substitution solution have been synthesized using the supercritical antisolvent precipitation (SAS) method, which uses supercritical CO2 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared (FTIR) spectroscopy, and magnetostatic measurements. It has been found that Co-enriched systems have a defective hexagonal close-packed (hcp) structure, which was described by a model which embedded cubic fragments of packaging into a hexagonal close-packed (hcp) structure. It has been shown that an increase in water content at the precipitation stage leads to a decrease in the size of cubic fragments and a more uniform distribution of them in Co-enriched systems. It has also been shown that mixed systems have the greatest coercivity in the line of samples. Ni-enriched bimetallic systems have a cubic close-packed (ccp) structure with modified crystal lattice parameters

Графики Дэя для бактериального магнетита из донных отложений озера Шира (Хакасия, Россия)

The domain state of magnetite detected in sediments of Shira lake (Khakassia, Russia) was examined by means of magnetic hysteresis. Analysis of experimental data obtained on samples from different parts of bottom sediment cores in terms of Day plots allowed us to conclude that magnetite particles are in the pseudo-single-domain state. This indicates respectively small size of magnetite particles (< 100 nm) and reveals their bacterial origin. Biogenic magnetite buried in the bottom sediments can indicate the climatic changes in the Shira lake level in the Late HoloceneИсследовано доменное состояние магнетита, обнаруженного в донных отложениях озера Шира (Хакасия, Россия). Из анализа экспериментальных данных по намагниченности образцов с разных участков керна донных отложений, а также на основе графиков Дэя сделан вывод, что части- цы магнетита находятся в псевдооднодоменном состоянии. Это указывает на малый размер частиц магнетита (< 100 nm) и подтверждает их бактериальное происхождение. Биогенный магнетит, содержащийся в донных отложениях, может служить индикатором климатиче- ских изменений в уровне озера Шира в позднем голоцен

Графики Дэя для бактериального магнетита из донных отложений озера Шира (Хакасия, Россия)

The domain state of magnetite detected in sediments of Shira lake (Khakassia, Russia) was examined by means of magnetic hysteresis. Analysis of experimental data obtained on samples from different parts of bottom sediment cores in terms of Day plots allowed us to conclude that magnetite particles are in the pseudo-single-domain state. This indicates respectively small size of magnetite particles (< 100 nm) and reveals their bacterial origin. Biogenic magnetite buried in the bottom sediments can indicate the climatic changes in the Shira lake level in the Late HoloceneИсследовано доменное состояние магнетита, обнаруженного в донных отложениях озера Шира (Хакасия, Россия). Из анализа экспериментальных данных по намагниченности образцов с разных участков керна донных отложений, а также на основе графиков Дэя сделан вывод, что части- цы магнетита находятся в псевдооднодоменном состоянии. Это указывает на малый размер частиц магнетита (< 100 nm) и подтверждает их бактериальное происхождение. Биогенный магнетит, содержащийся в донных отложениях, может служить индикатором климатиче- ских изменений в уровне озера Шира в позднем голоцен

Высокотемпературная эволюция намагниченности стали алюминиевого электролизера

The magnetic properties of steel of a structural element of an aluminum reduction cell have been investigated in the temperature range of 300–900 K. The analysis of the temperature dependence of the saturation magnetization MS(T) showed (i) the applicability of the Bloch’s 3=2 law and a reason- able value of the Bloch’s constant for steel and (ii) the quadratic dependence MS(T) (1 - T2) in the temperature range of 380–700 K.В работе исследованы магнитные свойства стали конструктивного элемента алюминиевого электролизера в области температур 300–900 K. Проведенный анализ температурной зависимости намагниченности насыщения MS(T) показал: (i) применимость "закона 3/2" Блоха, а также разумное значение константы Блоха и константы обменного взаимодействия для стали; (ii) квадратичную зависимость MS(T) (1 - T2) в температурном диапазоне 380–700

Synthesis and Magnetic Properties of Polycrystalline La_0.7Sr_0.3MnO₃ Manganite Films

В статье представлены результаты исследования магнитных свойств пленок манганита, полу- ченных экстракционно-пиролитическим методом. Показано влияние концентрации раствора на магнитные свойства. Установлено существование термомагнитных эффектов, зависящих от температуры отжига и магнитного поля.The magnetic properties of manganite films obtained by extraction pyrolysis have been investigated. The effect of solution concentration and annealing conditions on the magnetic properties of the materials under study has been established. It has been found that thermomagnetic effects in the materials depend on annealing temperature and external magnetic field

Synthesis and Magnetic Properties of Polycrystalline La_0.7Sr_0.3MnO₃ Manganite Films

В статье представлены результаты исследования магнитных свойств пленок манганита, полу- ченных экстракционно-пиролитическим методом. Показано влияние концентрации раствора на магнитные свойства. Установлено существование термомагнитных эффектов, зависящих от температуры отжига и магнитного поля.The magnetic properties of manganite films obtained by extraction pyrolysis have been investigated. The effect of solution concentration and annealing conditions on the magnetic properties of the materials under study has been established. It has been found that thermomagnetic effects in the materials depend on annealing temperature and external magnetic field