9 results on '"V. V. Kalaev"'
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2. Modeling of dislocation dynamics in germanium Czochralski growth
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A.F. Shimansky, Andrey Smirnov, E. D. Kravtsova, O. I. Podkopaev, Vladimir Artemyev, V. V. Kalaev, A. P. Sid’ko, and V. M. Mamedov
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Materials science ,chemistry.chemical_element ,Germanium ,Crystal growth ,02 engineering and technology ,01 natural sciences ,law.invention ,Inorganic Chemistry ,Crystal ,Condensed Matter::Materials Science ,law ,Condensed Matter::Superconductivity ,0103 physical sciences ,Materials Chemistry ,Crystallization ,010302 applied physics ,Dislocation creep ,Condensed matter physics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Crystallography ,chemistry ,Heat transfer ,Relaxation (physics) ,Dislocation ,0210 nano-technology - Abstract
Obtaining very high-purity germanium crystals with low dislocation density is a practically difficult problem, which requires knowledge and experience in growth processes. Dislocation density is one of the most important parameters defining the quality of germanium crystal. In this paper, we have performed experimental study of dislocation density during 4-in. germanium crystal growth using the Czochralski method and comprehensive unsteady modeling of the same crystal growth processes, taking into account global heat transfer, melt flow and melt/crystal interface shape evolution. Thermal stresses in the crystal and their relaxation with generation of dislocations within the Alexander-Haasen model have been calculated simultaneously with crystallization dynamics. Comparison to experimental data showed reasonable agreement for the temperature, interface shape and dislocation density in the crystal between calculation and experiment.
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- 2017
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3. Multiphysical simulation analysis of the dislocation structure in germanium single crystals
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V. M. Mamedov, A. D. Smirnov, V. V. Kalaev, A. F. Shimanskii, V. V. Artemyev, A. P. Sid’ko, O. I. Podkopaev, E. D. Kravtsova, Институт цветных металлов и материаловедения, and Кафедра композиционных материалов и физико-химии металлургических процессов
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010302 applied physics ,Dislocation creep ,dislocation ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,chemistry.chemical_element ,Crystal growth ,Germanium ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Software package ,01 natural sciences ,53.41.29 ,Condensed Matter::Materials Science ,Quality (physics) ,chemistry ,high-quality germanium ,Lattice defects ,0103 physical sciences ,Dislocation ,0210 nano-technology - Abstract
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала. To grow high-quality germanium crystals is one of the most important problems of growth industry. The dislocation density is an important parameter of the quality of single crystals. The dislocation densities in germanium crystals 100 mm in diameter, which have various shapes of the side surface and are grown by the Czochralski technique, are experimentally measured. The crystal growth is numerically simulated using heat-transfer and hydrodynamics models and the Alexander–Haasen dislocation model in terms of the CGSim software package. A comparison of the experimental and calculated dislocation densities shows that the dislocation model can be applied to study lattice defects in germanium crystals and to improve their quality.
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- 2016
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4. Mathematical simulation of electromagnetic stirring of liquid steel in a DC arc furnace
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M. M. Krutyanskii, S. M. Hekhamin, I. S. Nekhamin, S. N. Kolgatin, V. V. Kalaev, and S. A. Smirnov
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Physics::Fluid Dynamics ,Gravitation ,Electromagnetic stirring ,Materials science ,Field (physics) ,Computer simulation ,Turbulence ,Dc arc furnace ,Electrode ,General Engineering ,Mechanics ,Condensed Matter Physics ,Large eddy simulation - Abstract
Results are given of numerical simulation of electromagnetic stirring of metal melt in a dc arc furnace. The flow pattern and the transport of passive admixture in baths with one and two electrodes are studied. The mathematical model describes three-dimensional turbulent flow of electrically conducting liquid in the field of gravitational and electromagnetic forces. The parameters of turbulence are calculated in two approximations, namely, unsteady-state approximation by the large eddy simulation (LES) model and quasisteady-state approximation by the k-e model.
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- 2010
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5. Modeling analysis of liquid encapsulated Czochralski growth of GaAs and InP crystals.
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E. V. Yakovlev, V. V. Kalaev, E. N. Bystrova, O. V. Smirnova, Yu. N. Makarov, Ch. Frank-Rotsch, M. Neubert, and P. Rudolph
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- 2003
6. CLINICAL AND PREDICTIVE VALUE OF SERUM INTERLEUKINE-18 IN ST ELEVATION MYOCARDIAL INFARCTION
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M. V. Zykov, V. V. Kashtalap, I. S. Bykova, O. N. Khryachkova, V. V. Kalaeva, K. S. Shafranskaya, V. N. Karetnikova, and O. L. Barbarash
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myocardial infarction ,interleukine-18 ,multifocal atherosclerosis ,prognosis ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Aim. To assess clinical and predictive value of serum IL-18 in ST elevation myocardial infarction.Material and methods. Totally, 132 patients included, hospitalized to Kemerovo cardiovascular dispensary due to STEMI with
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- 2015
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7. ROLE OF THE SERUM NGAL FOR ASSESSMENT OF HOSPITAL PROGNOSIS IN MEN WITH ST ELEVATION MYOCARDIAL INFARCTION
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V. N. Karetnikova, A. V. Osokina, M. V. Evseeva, O. V. Gruzdeva, M. V. Zykov, V. V. Kalaeva, V. V. Kashtalap, K. S. Shafranskaya, O N. hryachkova, and O. L. Barbarash
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ngal, myocardial infarction, hospital outcomes ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Aim. To evaluate clinical significance of serum NGAL in ST elevation myocardial infarction (STEMI) patients in relation with the occurrence of in-hospital period complications.Material and methods. Totally 260 men included with STEMI, hospitalized in 24 hours after the onset of clinical symptoms of the disease. The measurement of serum NGAL concentration (ng/ml, sNGAL) at 1st and 2nd day of hospitalization was done with the hard-phase immune-enzyme analysis by Hycult® biotech assay (USA), registration was done on the plain reader “UNIPLAN” (SPF “PIKON”, Russia). At the stage of in-hospital treatment we registrated endpoints — signs of coronary failure (early post infarction angina, recurrent MI), grade of acute coronary failure (Killip I-IV class), grade of chronic heart failure (by NYHA), hospital mortality.Results. Patients were selected into 2 groups depending on the endpoints occurrence at hospital stage. Adverse hospital outcome (at least one endpoint) was found in 83 (32%) patients. The level of renal damage sNGAL, measured on the 1st day did not reveal any difference between groups with adverse or benign course of MI in hospital, and on 12th day the sNGAL concentration was significantly higher in group with adverse course — 2,1 ng/ml (1,44; 2,8) vs 1,55 ng/ml (1,11; 2,3), p=0,033. Monofactor analysis showed significance for adverse outcome, the factors as 2nd type diabetes, age >60 y., the fact of glomerular filtration rate decline during hospitalization, increase of sNGAL by 12th day. By the result of multifactor analysis — increase of the age by 1 year increases the chance of adverse outcome by 14%, increase of sNGAL by 12th day of MI increases adverse outcome chance by 3,2 times. the level of sNGAL ≥1,046 ng/ml associated with complicated course of in-hospital MI period.Conclusion. The level of sNGAL, measured on 1st day of MI did not have prognostic value for the inhospital complications, however concentration of sNGAL on 12th day was associated with already occured adverse outcomes, being a marker of MI severity.
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- 2015
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8. Application of biological markers of kidney injury for prognosis of long-term adverse outcomes in patients with ST-segment elevation myocardial infarction
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O. L. Barbarash, I. S. Bykova, V. V. Kashtalap, M. V. Zykov, O. N. Khryachkova, V. V. Kalaeva, K. S. Shafranskaya, and V. N. Karetnikova
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myocardial infarction ,renal dysfunction ,prognosis ,ngal ,Diseases of the blood and blood-forming organs ,RC633-647.5 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Objective: To study the prognostic significance of serum NGAL (sNGAL) and cystatin C in the acute phase of ST-segment elevation myocardial infarction (STEMI) in the late disease period. Material and Methods: 357 patients with STEMI, admitted to hospital within 24 h of symptom onset, were included in the study. Serum creatinine levels with the calculation of glomerular filtration rate (GFR) using the MDRD as well as levels of sNGAL and cystatin C were measured on day 1 and 12–14. Results: All patients were divided into 2 groups according to their estimated GFR: with and without renal dysfunction (RD), defined as a decrease of GFR < 60 ml/min/1.73 m2. Within 3 years of follow-up, the composite endpoint (CEP) were assessed (CEP – death + non-fatal cardiovascular events). The ROC curve analysis was used to determine the thresholds for every biomarker, involved in the CEP development: NGAL (≥ 1.25 ng / ml) and cystatin C (≥ 1.9 mg / l). On day 12–14 of hospitalization elevated NGAL ≥ 1.25 ng / mL was associated with a 3-fold increased risk for adverse cardio vascular events in a 3-year follow up after STEMI; whereas, elevated cystatin C ≥ 1.9 mg/l – with a 2-fold increased risk for the CEP, and signs of RD, found in patients before the discharge from the hospital, – with a 1.5-fold increased cardiovascular risk. The model considering an increase of NGAL over 1.25 ng / l has the highest prognostic value, while the models based on the levels of cystatin C and GFR are of equal prognostic value. Conclusion: The most promising issue in the prognosis of long-term adverse outcomes in patients with STEMI may be considered the assessment of RD using new biomarkers such as sNGAL.
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- 2014
9. Role of microalbuminuria for inhospital event risk assessment after coronary artery bypass surgery
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K. S. Shafranskaja, A. A. Kuzmina, D. A. Sumin, K. V. Kamlenok, K. E. Krivoshapova, V. V. Kalaeva, M. V. Evseeva, O. L. Barbarash, and L. S. Barbarash
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coronary artery bypass surgery ,prognosis ,microalbuminuria ,Diseases of the blood and blood-forming organs ,RC633-647.5 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
The course of perioperative period in 719 patients undergoing CABG in the Research Institute for Complex Issues of Cardiovascular Diseases between March, 2011 and April, 2012 was evaluated. All the patients had creatinine concentrations, glomerular filtration rate (GFR by MDRD) and daily urine microalbumin levels measured before CABG and at day 7 after CABG. Major event rates were assessed (myocardial infarction, stroke or transient ischemic attack, acute or decompensated chronic renal failure or remediastinotomy) during the hospital stay. The EuroSCORE was calculated for each patient. Different EuroSCORE risk patients had similar serum creatinine levels while microalbumin concentrations in daily urine were significantly higher in moderate and high EuroSCORE risk groups before the surgery as compared to low-risk patients. Patients who experienced postoperative events had significantly higher microalbuminuria both before and after surgery while there were no differences in such renal dysfunction markers as creatinine and GFR. Preoperative microalbuminuria assessment can act as a marker of complicated postoperative period after CABG.
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- 2013
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