Stress Cardiomyopathy (Takotsubo Cardiomyopathy)

In this article we describe a rare clinical condition of stress cardiomyopathy (takotsubo cardiomyopathy) for which we, despite controversy and lack of data, identified the main pathogenic pathways (including the direct toxic effect of catecholamines on the myocardium, catecholamine-mediated myocardial stunning, and microcirculation disorders). After the systematic review, we identified the distinct pathology features of this condition and new diagnostic strategies

Theoretical Studies of the Magnetic Anisotropy of Cobalt Films Separated by a Copper Plate

In this work, we studied the energy and magnetic properties of the Co/Cu/Co system. Calculations have shown that for the (100) and (111) faces, direction of magnetic moments parallel to the film plane is energetically favorable. For the (110) face, a weak perpendicular magnetoanisotropy was obtainedИсследование выполнено при финансовой поддержке Минобрнауки РФ (соглашение 0741-2020-0002)

Nucleation and growth of a new phase at the intermediate stage of phase transitions in metastable solutions and melts

A complete analytical solution of an integro-differential model, which describes the intermediate stage of phase transitions in one-component melts and solutions without allowance for fluctuations in the crystal growth rates, is found. An exact analytical solution of the kinetic equation is determined within the framework of this model. The density of distribution function of crystals in sizes is found. An integro-differential equation for the system metastability level (for its supercooling/supersaturation) is derived for different kinetic mechanisms of particle nucleation. A complete analytical solution of this equation is constructed on the basis of saddle-point method for the Laplace-type integral (steepest descent method). Four approximations of the analytical solution are analyzed and its convergence is shown. The kinetic mechanisms of Weber-Volmer-Frenkel-ZePdovich and A loirs are studied. A transient behavior of the number of particles and the mean crystal size is determined for supercooled melts

STRUCTURE AND PHYSICO-MECHANICAL PROPERTIES OF THE TERNARY Cu/Al/Mg-COMPOSITE

Ternary composite based on Cu-Al-Mg was obtained by hydroextrusion. To analyze the effect of interfaces on the properties of a composite, specimens with different heat treatments were studied. The mechanical and electrical properties of the composites have been studied.Работа выполнена в рамках государственного задания Минобрнауки РФ “Давление” № 122021000032-5

Плевро-перикардиальное окно как метод хирургической профилактики значимого перикардиального выпота у пациентов после трансплантации сердца

Postoperative pericardial effusion (PPE) represents a very common complication in cardiac surgery. Accumulation of a significant amount of free fluid in the pericardial cavity is a multifactorial process. Identifying the cause is not always possible. This complication occurs more frequently in patients after heart transplantation than in patients who underwent reconstructive cardiac surgery. Having hemodynamically significant effusion requires surgical evacuation of fluid from the pericardial cavity. This can affect the postoperative period and increase the length of stay at the hospital. For this reason, developing and ensuring widespread use of methods for prevention of this complication are urgent and relevant tasks.Перикардиальный выпот после кардиохирургического вмешательства является одним из наиболее распространенных осложнений. Процесс накопления значимого количества свободной жидкости в полости перикарда является многофакторным, и не всегда удается установить причину его развития. У пациентов после трансплантации сердца данное осложнение встречается чаще, чем у пациентов, перенесших реконструктивное кардиохирургическое вмешательство. Наличие гемодинамически значимой эффузии требует выполнения хирургической эвакуации жидкости из полости перикарда, что может сказываться на течении послеоперационного периода и увеличивать срок госпитализации пациентов. По этой причине разработка и широкое применение методов профилактики данного осложнения являются актуальными

Seasonal fluctuations in Baltic sea level determined from satellite altimetry

International audienceThis study used gridded daily satellite altimetry observations to investigate the spatial variability in the Baltic seasonal sea-level cycle and to assess the main factors that affected its interannual changes during the 1993-2018 period. In addition to the widely studied annual (Sa) and semiannual (Ssa) harmonics, the characteristics of higher frequency oscillations (terannual (three times a year or Sta) and quarterannual (four times a year or Sqa)) were investigated. We demonstrated that the Sa, Ssa, and Sqa harmonics can be reliably identified from gridded daily satellite altimetry data for all regions of the Baltic Sea. The Sta harmonic was reliably identified in all regions except the southeast part of the Baltic Proper and Danish Straits. Low amplitudes and large uncertainties caused by noise in the SLA time series impeded the Sta evaluation in these two regions. In the Baltic Sea, annual oscillations of sea level propagate from the southwest to northeast at a speed of 0.15-0.36 m/s, which is close to the theoretical phase speed of the baroclinic Kelvin wave. The Ssa, Sta, and Sqa oscillations did not demonstrate a statistically reliable spatial variability in the phase. In many regions of the Baltic Sea for the 1993-2018 period, a statistically significant (at the 95% level) increase of +1.3- + 2.2 mm/yr was observed for the amplitudes of the Sa harmonic, while for the amplitudes of the Ssa harmonic, a statistically significant decrease was detected. No statistically significant changes were observed in the amplitudes of the Sta and Sqa harmonics. Wind, atmospheric pressure, and water exchange with the North Sea correlated well with interannual changes in the sea-level seasonal cycle. The air temperature correlated well only with the Sa component. Precipitation, evaporation, and river input were not correlated with seasonal or interannual changes in the sea-level cycle

Determination of Cement Shrinkage in Laboratory Conditions

В данной статье предложен метод определения объемной усадки цементного раствора, заключающийся в измерении скорости фильтрации жидкости или газа через зазор между цементным камнем и стенкой ячейки прибора, образовавшийся в результате объемной усадки. В методе используется стандартная и широко распространенная ячейка для измерения водоотдачи по стандарту API RP 10B-2. Выполнены эксперименты со стандартными тампонажными системами. Была измерена усадка тяжёлого раствора с плотностью 1900 кг/м3 и облегченного раствора с плотностью 1600 кг/м3. Измерялся расход азота и керосина. В статье показано, что для легкого цемента предложенный метод показывает хорошую сходимость экспериментов и может применяться на практике. Для тяжелых растворов цемента предлагаемый метод дает только качественные результаты.The article suggests a method for determining the volume shrinkage of cement slurry. It involves measuring velocity of fluid or gas filtration through a gap between the cement stone and the wall of the device cell formed as a result of volume shrinkage. A standard and widespread cell is used for water loss measurement according to API RP 10B-2. The experiments were carried out with the standard cementing slurries. The shrinkage of heavy cement slurry with the density of 1900 kg/m3 and the shrinkage of light cement slurry with the density of 1600 kg/m3 were determined. The flowrates of nitrogen and kerosene were measured. It is shown that for light cement slurries the suggested method shows good agreement between the experiments and can be applied in practice. For heavy cement slurries the suggested method gives only qualitative results