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Mathematical modeling of nanodispersed hardening of FCC materials

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Acta Metallurgica Sinica(English Letters) 2018年第12期31卷 1297-1304页

作者： Oleg matvienko Olga Daneyko Tatyana Kovalevskaya National Research Tomsk State University TomskRussia 634050 Tomsk State University of Architecture and Building TomskRussia 634003

The plastic deformation of the pipe made of Cu-based alloy hardened by incoherent nanoparticles and subjected to theuniform internal pressure was investigated. The limits of elastic and plastic resistance are determined. The insignificantexcess in the limit of the elastic resistance enables the plastic deformation in the most part of the pipe wall. The densities ofshear-forming dislocations and prismatic dislocation loops are higher in alloys strengthened with coarse particles than inalloys strengthened with fine particles. At small distances between the strengthening particles, this effect is the mostpronounced.

关键词： Deformation Dislocation Dispersion-strengthening - Nanoparticles Hardening Stress Strain Elastic-plastic deformation Pipe

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Inflatable Models

Journal of Computer Science & Technology 2006年第2期21卷 154-158页

作者：李凌 vasily Volkov Department of Computing Curtin University of Technology Perth WA 6845 Australia

A physically-based model is presented for the simulation of a new type of deformable objects-inflatable objects, such as shaped balloons, which consist of pressurized air enclosed by an elastic surface. These objects have properties inherent in both 3D and 2D elastic bodies, as they demonstrate the behaviour of 3D shapes using 2D formulations. As there is no internal structure in them, their behaviour is substantially different from the behaviour of deformable solid objects. We use one of the few available models for deformable surfaces, and enhance it to include the forces of internal and external pressure. These pressure forces may also incorporate buoyancy forces, to allow objects filled with a low density gas to float in denser media. The obtained models demonstrate rich dynamic behaviour, such as bouncing, floating, deflation and inflation.

关键词： inflatable models physically based modelling physically based animation

Late Jurassic ammonite evolution and paleoenvironment of the Russian Platform

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Science China Earth Sciences 2009年第12期52卷 2024-2028页

作者： MITTA vasily Paleontological Institute Russian Academy of Sciences Moscow 117997 Russia

The stratigraphic record shows a considerable decrease in ammonoid taxonomic diversity and distinct changes of ammonite shell morphology toward end of the Jurassic in the Central Russian Basin. By the end-Volgian, ammonites were represented by only two genera, belonging to a single family Craspeditidae, which differ markedly from previous ammonite families in their shell form. The end-Jurassic decrease in ammonoid biodiversity started in the mid-Volgian and is mainly correlated with shallowing of the shelf.

关键词： Volgian Ryazanian ammonites biodiversity Russian Platform

Long-term trends in solar activity. Variations of solar indices in the last 40 years

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Research in Astronomy and Astrophysics 2019年第7期19卷 1-12页

作者： Elena Bruevich vasily Bruevich Sternberg Astronomical Institute Moscow State University

We analyze long-term variations of several solar activity indices(AIs) that have been measured over the last 40 *** this goal,we study the AIs that characterize the fluxes from different areas in the solar *** consideration of mutual correlations between the solar indices is based on the study of relationships between them in the period from 1950 to *** period of time,covering activity cycles 19–22,is characterized by relatively stable relations between the *** investigate the normalized variations of these indices in recent time in relation to their values which were calculated by considering radiation from the Sun in the radio range at a wavelength of 10.7 cm(F10.7) in 1950–*** analysis of time series,representing variations of the normalized AI(AIFF) in solar cycles 23–24,shows different trends exist for different indices in terms of their long-term *** assume that variations of normalized International Sunspot Number(SSN),F530.3 and Flare Index,which have shown sharp decreases in the last 40 years,are possibly associated with a decrease in the intensity of large-scale magnetic fields in the photosphere(SSN) and in the corona(the coronal index and the Flare Index).

关键词： method data analysis-Sun activity indices

Autoimmune gastritis studies and gastric cancer: True renaissance or bibliometric illusion

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World Journal of Gastroenterology 2024年第32期30卷 3783-3790页

作者： vasily Isakov Department of Gastroenterology and Hepatology Federal Research Center of NutritionBiotechnology and Food SafetyMoscow 115446Russia

A bibliometric analysis of studies dedicated to autoimmune gastritis(AIG)recently published demonstrated a noteworthy surge in publications over the last three *** can be explained by numerous publications from different regions of the world reporting the results of several studies that stimulated reassessment of our view of AIG as a precancerous ***-up studies and retrospective analyses showed that the risk of gastric cancer(GC)in AIG patients is much lower than expected if the patients ever being infected with Helicobacter pylori(***)were *** low prevalence of precancerous lesions,such as the incomplete type of intestinal metaplasia,may explain the low risk of GC in AIG patients because the spasmolytic polypeptide-expressing metaplasia commonly observed in AIG does not involve clonal reprogramming of the gastric gland and can be considered as an adaptive change rather than a true precancerous ***,changes in gastric secretion due to the progression of gastric atrophy during the course of AIG cause changes in the gastric microbiome,stimulating the growth of bacterial species such as streptococci,which may promote the development of precancerous lesions and ***,Streptococcus anginosus exhibited a robust proinflammatory response and induced the gastritis-atrophy-metaplasia-dysplasia sequence in mice,reproducing the wellestablished process for carcinogenesis associated with *** studies in ***-naïve patients evaluating gastric microbiome changes during the long-term course of AIG might provide an explanation for the enigmatic increase in GC incidence in the last decades in younger cohorts,which has been reported in economically developed countries.

关键词： Autoimmune gastritis Gastric cancer Type 1 neuroendocrine tumors Helicobacter pylori Streptococcus anginosus Intestinal metaplasia

Model of fractured medium and nondestructive control of composite materials

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Chinese Journal of Aeronautics 2024年第2期37卷 93-99页

作者： vasily GOLUBEV Ilia NIKITIN Katerina BEKLEMYSHEVA Department of Computers Science and Numerical Mathematics Moscow Institute of Physics and TechnologyDolgoprudny 141700Russia Mathematical Modeling and Management Department of InformatizationInstitute of Computer Aided Design RASMoscow 123056Russia

Non-destructive testing of composites is an important issue in the modern aircraft *** are susceptible to the barely visible impact damage which can affect the residual strength of the material and occurs both during production and *** continuum model for describing the damaged zone is *** slip theory relations used for a continuous distribution of slip planes are *** the initial stage,the isotropic background model is *** model allows the material slippage along the fractures based on the Coulomb friction law with the small viscous *** this regime,the govern system of equations becomes *** overcome this difficulty,the explicit-implicit grid-characteristic scheme is *** standard ultrasound diagnostic procedure of damaged composite materials is successfully *** with the trivial free-surface fracture model,different reactions on the compression and stretch waves are *** approach provided an effective way for the simulation of complex dynamic behavior of damage zones.

关键词： Non-destructive testing Composite materials Numerical modeling Continuum model Grid-characteristic method

Nanozyme catalysis in a crowded environment:The impact of diffusion and surface shielding

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Nano Research 2024年第7期17卷 5795-5800页

作者： vasily G.Panferov Juewen Liu Department of Chemistry Waterloo Institute for NanotechnologyWaterlooOntario N2L 3G1Canada

Nanozymes are widely used in various applications as nanosized catalysts for replacing *** accurate estimation of the catalytic activity of nanozymes in real conditions is *** this article,for the first time,we systematically studied the effect of macromolecular molecules co-existing in the real system on the oxidoreductase(peroxidase,oxidase,and catalase)-mimicking nanozymes made of a gold nanoparticle core and a platinum shell,Prussian Blue,Mn_(2)O_(3) and CoO *** were made with horseradish *** distinguished two main mechanisms of the negative impact of macromolecules on nanozyme catalysis—slowed diffusion and surface shielding of *** the first mechanism is typical for enzymes,the second one is specific only for *** the mechanisms is essential for developing approaches to reduce the unavoidable impact of macromolecules for various analytical and biomedical applications.

关键词： molecular crowding biosensors nanoparticles

The brain compensatory mechanisms and Alzheimer's disease progression:a new protective strategy

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Neural Regeneration Research 2015年第5期10卷 696-697页

作者： Natalia Bobkova vasily Vorobyov Institute of Cell Biophysics Russian Academy of Sciences

Compensatory/adaptive mechanisms in the brain are hy- pothesized to be involved in its protection from the Alz- heimer＇s disease （AD） progression. These mechanisms are activated by malfunctioning of various brain systems： anti- oxidant, neurotrophic, neurotransmitter, immune, and oth- ers. Detailed analysis of compensatory^adaptive capabilities of these systems might be a start point for further discovery and development of perspective approaches for early diag- nostics and treatment of AD and associated neurodegenera- tive disorders.

关键词： The brain compensatory mechanisms and Alzheimer’s disease progression AD

The unfinished Nobel race of Eugene Zavoisky: to the 75th anniversary of EPR discovery

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Science Bulletin 2019年第3期64卷 146-148页

作者： vasily V.Ptushenko Belozersky Institute of Physico-Chemical Biology Lomonosov Moscow State University Emanuel Institute of Biochemical Physics Russian Academy of Sciences

On 21, January 2019 there will be 75 years when electron paramagnetic resonance (EPR) was discovered by Eugene (Yevgeny)Konstantinovich Zavoisky (Fig. 1) in 1944 in the USSR. This method has revolutionized the study of various physical, chemical and biological systems, and the importance of Zavoisky’s discovery is acknowledged by the EPR scientific community all over the world.

关键词： Eugene Zavoisky anniversary EPR