scholarly journals Localization and elimination of glare in images of model ice surface

2020 ◽  
pp. 251-256
Author(s):  
И.А. Белянов ◽  
П.Н. Звягин
Keyword(s):  
Anisotropic Diffusion ◽  
Reconstruction Algorithm ◽  
Concentration Function ◽  
Automatic Recognition ◽  
Research Centre ◽  
Artificial Lighting ◽  
Saint Petersburg ◽  
Fine Grain ◽  
Ice Surface ◽  
State Research

Изображения, получаемые при проведении экспериментов в ледовом бассейне, как правило, содержат многочисленные блики от средств искусственного освещения и естественных источников света. Вследствие зернистой структуры моделированного льда, в рамках одного блика яркие пиксели чередуются с более темными. Такие дефекты изображений препятствуют их автоматическому распознаванию. В статье предложены способы локализации данных дефектов и алгоритм их исключения с восстановлением изображения. Метод локализации замещаемой области основан на использовании функции концентрации пикселей с высокими значениями интенсивности. Алгоритм восстановления изображения основан на итеративном применении методов интерполяции и анизотропной диффузии. Эффективность предложенного способа продемонстрирована на примере восстановления изображений поверхности моделированного льда, приготовленного по технологии Fine Grain в ледовом бассейне Крыловского государственного научного центра (Санкт-Петербург). Images obtained during experiments in an ice tank as a rule contain a lot of glare from artificial lighting and photo equipment. Due to the grainy structure of model ice, bright pixels alternate with darker ones. Therefore, such defects prevent automatic recognition of images. The article suggests the method for localization of light spots on the surface of model ice as well as the algorithm for their elimination and image restoration. The method of area replacement is based on the use of high intensity pixel concentration function and delta concentration function. The image reconstruction algorithm is based on iterative application of interpolation and anisotropic diffusion methods to the part of an image with localized light spot. The effectiveness of the proposed method is demonstrated by the example of restoring images of the surface of simulated ice prepared in accordance with the Fine Grain technology in the ice tank of the Krylov State Research Centre (Saint Petersburg).

scholarly journals Association of alcohol withdrawal severity with MTNR1A (rs34532313) and MTNR1B (rs10830963) genes polymorphisms

2021 ◽  
Vol 1 (2) ◽  
pp. 111-116
Author(s):  
I. S. Efremov ◽  
D. R. Tukhvatullina ◽  
U. S. Efremova ◽  
V. R. Gashkarimov ◽  
N. R. Tulbaeva ◽  
...  
Keyword(s):  
Alcohol Withdrawal ◽  
Alcohol Use Disorder ◽  
Melatonin Receptors ◽  
Research Centre ◽  
Melatonin Receptor ◽  
Saint Petersburg ◽  
Severe Withdrawal ◽  
Final Sample ◽  
Threatening Condition ◽  
Polymorphic Variants

Alcohol withdrawal is the most threatening condition encountered in patients with alcohol use disorder. Our study aimed to investigate the association of alcohol withdrawal severity with polymorphic variants in melatonin receptor genes. Methods. The clinical study was carried out on the basis of the Republican Narcological Dispensary №1 in Ufa and the Republican Narcological Dispensary №2 in Sterlitamak. Genetic analysis was performed at the Department of Personalised Psychiatry and Neurology at the V.M. Bekhterev Research Centre, Saint Petersburg. The final sample consisted of 307 subjects. Results. Carriers of the TT genotype of the MTNR1A gene (rs34532313) were found to have less hypertension during alcohol withdrawal than carriers of the other genotypes. In comparison, carriers of the GG genotype of the MTNR1B gene (rs10830963) experienced more symptoms than other genotypes: paroxysmal sweating, visual hallucinations, anxiety, and overall CIWA-Ar score. Conclusions. Thus, it can be concluded that the TT genotype of MTNR1A gene (rs34532313) is associated with a lower risk of hypertension during alcohol withdrawal compared to carriers of other gene genotypes. The GG genotype of MTNR1B gene (rs10830963) is associated with severe withdrawal. In general, it can be concluded that melatonin receptors are involved in the pathogenesis of alcohol withdrawal and the severe of some of its symptoms. 

scholarly journals Advantages of modeling ABL properties to determine wind loads on structures

2018 ◽  
Vol 245 ◽  
pp. 09007 ◽  
Author(s):  
Evgenii Khrapunov ◽  
Sergei Solovev
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Velocity Profile ◽  
Experimental Tests ◽  
Wind Loads ◽  
Research Centre ◽  
Oncoming Flow ◽  
Mean Velocity ◽  
State Research

In present paper we introduce the main advantages of modeling atmospheric boundary layer (ABL) properties for determination of mean and peak wind loads on structures. Experimental tests were carried out using wind tunnel with uniform velocity profile and new Landscape Wind tunnel (LWT) of Krylov State Research Centre. General characteristics of simulated boundary layer (such as mean velocity profile and turbulence intensity profile) are presented. For wind loads measurements model of Silsoe cube in a scale of 1:15 was used. Comparison of the data obtained at both test rigs with data published in early studies is performed. New data about aerodynamic forces acting on the model in range of angles of oncoming flow are presented. Algorithm for determination of peak wind loads is discussed.

scholarly journals Innovative developments of Krylov State Research Centre to improve the safety and reliability of vessels with podded trust units in extreme ice conditions

2018 ◽  
pp. 92-103
Author(s):  
Valerij Adamovich Belyashov ◽  
◽  
Nikolai Vasil'evich Vasilev ◽  
Vyacheslav Vladislavovich Makarov ◽  
Leonid Gennad'evich Pautov
Keyword(s):  
Research Centre ◽  
State Research ◽  
Safety And Reliability ◽  
Ice Conditions

REPORT FROM THE TECHA RIVER DOSIMETRY REVIEW WORKSHOP HELD ON 8???10 DECEMBER 2003 AT THE STATE RESEARCH CENTRE INSTITUTE OF BIOPHYSICS, MOSCOW, RUSSIA

2006 ◽  
Vol 90 (2) ◽  
pp. 97-113 ◽  
Author(s):  
Mikhail Balonov ◽  
Rudolf Alexakhin ◽  
Andr?? Bouville ◽  
Jan-Olov Liljinzin
Keyword(s):  
The State ◽  
Research Centre ◽  
Techa River ◽  
State Research

scholarly journals Physical modeling of ice load on extended hydraulic constructions. The vertical wall constructions

2020 ◽  
pp. 77-89
Author(s):  
A.A. Dobrodeev ◽  
◽  
K.E. Sazonov ◽  
Keyword(s):  
Mathematical Models ◽  
Physical Modeling ◽  
Model Experiment ◽  
Vertical Wall ◽  
Research Centre ◽  
Federal State ◽  
Federal State Unitary Enterprise ◽  
Regulatory Documents ◽  
Ice Load ◽  
State Research

The authors present the results of studies carried out in the laboratory “Ice tank” of the Federal State Unitary Enterprise “Krylov State Research Centre”, related to the study of the ice effect on extended hydraulic constructions with a vertical wall. They analyze the possibilities of applying the method of physical modeling to investigate the processes of ice-construction interaction in ice tank. The results make it possible to recommend the method of physical modeling as one of the main approaches for studying the interaction specifics of hydraulic constructions with ice. The data of the model experiment can help to construct mathematical models of ongoing processes, as well as to clarify the requirements of regulatory documents.

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