Herald of the Bauman Moscow State Technical University. Series Natural Sciences最新文献_第10页

Antioxidant Properties of Ethyl Acetate Osage Orange Extract (Maclura pomifera) 橙叶提取物的抗氧化性能

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/1812-3368-2022-3-96-109

L. Vardanyan, S. Hayrapetyan

{"title":"Antioxidant Properties of Ethyl Acetate Osage Orange Extract (Maclura pomifera)","authors":"L. Vardanyan, S. Hayrapetyan","doi":"10.18698/1812-3368-2022-3-96-109","DOIUrl":"https://doi.org/10.18698/1812-3368-2022-3-96-109","url":null,"abstract":"The antioxidant properties of ethyl acetate extracts of fruits, leaves and bark of the Osage orange (Maclura pomifera) tree were studied by a kinetic method using the example of a model reaction of cymene oxidation. The extracts exhibit antioxidant properties. Findings of the research show that fresh orange maclura fruits contain the greatest amount of antioxidants. At a temperature of 348 K, the effective content of antioxidant substances is 1.05 · 10--3 mol/(l · mg). The analysis of the effective content of antioxidants in each extract revealed that it decreases when the extract is stored at room (289 K) temperature. Antioxidant activities of antioxidants were determined --- rate constants of InH + RO•2→ ROOH + In•. According to the content of antioxidants, the ethyl acetate extracts are distributed in the following order: fruits > bark > leaves, and according to antioxidant activity --- bark > fruits > leaves. The dependence of the effective content of antioxidants on the measurement temperature was examines. The study shows that the effective content of antioxidants increases, especially in the extracts of dried fruits, leaves and bark of Osage orange, with decreasing temperature. This is due to a decrease in the additional initiation of primary radicals as a result of the autoxidation of easily oxidizing substances contained in the extracts","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"18 11‐12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72389743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Forming and Displaying Video Data in Onboard Enhanced Vision Multispectral Systems 车载增强型视觉多光谱系统中视频数据的形成与显示

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/0236-3933-2022-2-79-95

M. Bondarenko, A. Bondarenko, V. N. Drynkin, Yu.V. Pavlov

{"title":"Forming and Displaying Video Data in Onboard Enhanced Vision Multispectral Systems","authors":"M. Bondarenko, A. Bondarenko, V. N. Drynkin, Yu.V. Pavlov","doi":"10.18698/0236-3933-2022-2-79-95","DOIUrl":"https://doi.org/10.18698/0236-3933-2022-2-79-95","url":null,"abstract":"The article considers the results of long-term research and real flight tests for developing a multichannel system for enhanced vision in difficult for aircraft crew visibility conditions. The multicomponent nature of the aggregate video signal generated by a multispectral video system is shown, justifying its representation in color and the need to develop a color indicator of the aircraft windshield to obtain a better quality of situational awareness for pilot compared to the capabilities of traditionally used monochrome indicators. A method for integrating monochrome images of multichannel enhanced vision system spectral channels into a color multicomponent image is proposed. For more natural perception of the resulting color images by the human eye, the spectrum of the spectral characteristics of the video channels is rearranged in the direction of decreasing wavelength. For the most common RGB color image format, the red component R of the display system records the image of the long-wave thermal range, the green component G records the image of the mid-wave infrared range, the blue component B records the image of the short-wave visible television range. The resulting pseudo-color image allows unambiguous restoring the original images. This proves the absence of information loss during image integration. Since there are no colored windscreen displays yet, a method for reproducing a pseudo-color image on a mono-chrome display is proposed. To convert a pseudo-color image to monochrome one, methods are used in which color contrasts are preserved in the form of tonal contrasts. The advantages of the proposed technology are demonstrated on real examples","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"218 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75616267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Factual Power Loss Lessening by Enhanced Synthetic Biome Optimization and Green Algae Algorithms 基于增强型合成生物群优化和绿藻算法的实际功率损耗降低

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/1812-3368-2022-3-28-42

L. Kanagasabai

{"title":"Factual Power Loss Lessening by Enhanced Synthetic Biome Optimization and Green Algae Algorithms","authors":"L. Kanagasabai","doi":"10.18698/1812-3368-2022-3-28-42","DOIUrl":"https://doi.org/10.18698/1812-3368-2022-3-28-42","url":null,"abstract":"In this paper Enhanced Synthetic Biome Optimization (ESBO) and Green Algae algorithm (GAA) is designed to abridge the power loss. Synthetic Biome Optimization (SBO) algorithm is a nature-inspired optimization algorithm, stimulated by the stream of energy in a biome on the world. The biome can be enunciated as a cluster of existing entities living in a certain province and the biome outlines the associations among them. The deprived entity (creator) is rationalized by the upper and low borders of exploration space and the pre-eminent entity (putrefaction). Levy flight applied to augment the exploration and imitate the food probing process of many faunae. In order to augment the convergence characteristics of the SBO algorithm, sine-cosine functions has been incorporated in the technique. This augmentation will stimulate divergent solutions and modifies in the direction of the distinguished prospective solution in ESBO. Proposed GAA approach imitates growing, reproduction deeds of green algae in sunlight. Green algae live in the shape of algal colonies which consist of algal cells. When green algae in least amount of sunlight it will be small size, energy and particularly starvation level will be high, but it will attempt to acclimatize by using adaptation probability in the ambiance where it positioned. Enhanced Synthetic Biome Optimization and GAA appraised in IEEE 57 and 300 bus systems. Assessment with other techniques has been done. Projected ESBO and GAA approaches abridged the power loss meritoriously","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81761511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mathematical Simulation of Nonlinear Vibrations of a Channel Wall Interacting with a Vibrating die Via Viscous Liquid Layer 槽壁与振动模具经粘性液层相互作用非线性振动的数学模拟

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/0236-3933-2022-2-26-41

L. Mogilevich, V. Popov, A. Popova, A. V. Khristoforova

{"title":"Mathematical Simulation of Nonlinear Vibrations of a Channel Wall Interacting with a Vibrating die Via Viscous Liquid Layer","authors":"L. Mogilevich, V. Popov, A. Popova, A. V. Khristoforova","doi":"10.18698/0236-3933-2022-2-26-41","DOIUrl":"https://doi.org/10.18698/0236-3933-2022-2-26-41","url":null,"abstract":"The article considers the developed mathematical model and investigates the dynamics of the interaction of a channel wall supported by a nonlinear spring with a vibrating opposite wall through a viscous fluid layer filling the channel. A flat slotted channel formed by two absolutely rigid rectangular walls, parallel to each other was investigated. One of the channel dimensions in the plan was much larger than the other, which leads to the transition to a plane problem. The bottom channel wall rested on a spring with a cubic nonlinear characteristic, and the upper wall was a die oscillating according to a given law. The gap between the walls was assumed to be much smaller than the channel longitudinal dimension, and the amplitudes of wall vibrations were much less than the channel gap. The movement of the viscous fluid in the channel was considered to be creeping. The mathematical model of the channel under consideration consisted of an equation of the dynamics of a single-mass system with a spring having a cubic nonlinearity, as well as the Navier --- Stokes and continuity equations, supple-mented by the boundary conditions for fluid nonslip on the channel walls and its free outflow at the ends. The steady-state nonlinear vibrations of the bottom channel wall at the fundamental frequency were studied, and its hydroelastic response was determined. The proposed model can be used to study nonlinear vibrations of elastically fixed elements that are in contact with liquid and are parts of modern devices and assemblies","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"178 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85041774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Matrix Approach to Solving Reachability Problems in Stochastic Petri Nets 求解随机Petri网可达性问题的矩阵方法

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/1812-3368-2022-3-4-16

D.S. Zvyagin, O. Pyankov, A. N. Kopylov

{"title":"Matrix Approach to Solving Reachability Problems in Stochastic Petri Nets","authors":"D.S. Zvyagin, O. Pyankov, A. N. Kopylov","doi":"10.18698/1812-3368-2022-3-4-16","DOIUrl":"https://doi.org/10.18698/1812-3368-2022-3-4-16","url":null,"abstract":"The purpose of the research was to develop the theory of stochastic Petri nets and consider its practical application when studying discrete systems. The paper considers the possibility of solving the reachability problem in stochastic Petri nets by means of matrix equations widely used in Petri nets; describes the stages and features of generating matrix equations for stochastic networks; formulates the rules for introducing virtual elements, i.e., positions and transitions, into the stochastic Petri net to generate and solve matrix equations. Stochastic Petri nets different in structure and composition were used to explore the possibility of applying matrix equations. Findings of the research show that the reachability of the required states of the networks is determined through the firing of transitions, which are the solution of the matrix equation. Within the study, we interpreted the obtained results and developed an algorithm that allowed us to validate the assumption made and visually determine the restrictions on the use of matrix equations for various initial states of the simulated system. The results of the proposed algorithm are presented in graphical form on the examples of stochastic Petri nets that model the process of forensic handwriting analysis. The conclusion is made about the applicability of matrix equations in stochastic Petri nets and the need for further research in this area","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81350526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Investigation of a Supersonic Flow in the Near Wake Region of a Cylindrical Afterbody 圆柱形后体近尾迹区超音速流动的数值研究

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/1812-3368-2022-3-86-95

Alexander M. Molchanov, D. Yanyshev, L. Bykov

{"title":"Numerical Investigation of a Supersonic Flow in the Near Wake Region of a Cylindrical Afterbody","authors":"Alexander M. Molchanov, D. Yanyshev, L. Bykov","doi":"10.18698/1812-3368-2022-3-86-95","DOIUrl":"https://doi.org/10.18698/1812-3368-2022-3-86-95","url":null,"abstract":"A computational study of a supersonic flow in the base region and the nearest wake of a cylindrical body moving at a supersonic speed have been carried out. A mathematical model of high-enthalpy flows is presented. In this case, the \"prehistory\" of the flow was taken into account, i.e., the configuration of the computational domain was as close as possible to the real one. The use of various turbulence models for calculating flow in the base region and the nearest wake was analyzed. The following turbulence models were considered: 1) the Spalart --- Allmaras model; 2) SST model; 3) standard k--ε model; 4) k--ε model with compressibility correction; 5) k--ε RNG (renormalized group) model; 6) k--ε Realizable model; 7) standard Reynolds Stress (RS) model; 8) RS BSL (Reynolds stress baseline) model. Based on a comparison of the calculation results with experimental data, it is shown that: 1) when calculating the flow in the base region and in the wake of the vehicle, it is very important to take into account the \"prehistory\" of the flow, i.e., to calculate the flow around the entire vehicle; 2) the best match was obtained using Reynolds Stress models and the k--ε RNG model","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83603271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Numerical Models of the Dynamics of Electrically Charged Gas Suspensions with Mass and Surface Charge Densities for Different Particles Dispersities 不同粒子分散度下带质量和表面电荷密度的带电气体悬浮液动力学数值模型的比较

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/1812-3368-2022-3-43-56

D. A. Tukmakov

{"title":"Comparison of Numerical Models of the Dynamics of Electrically Charged Gas Suspensions with Mass and Surface Charge Densities for Different Particles Dispersities","authors":"D. A. Tukmakov","doi":"10.18698/1812-3368-2022-3-43-56","DOIUrl":"https://doi.org/10.18698/1812-3368-2022-3-43-56","url":null,"abstract":"The purpose of the study was to mathematically model the dynamics of inhomogeneous electrically charged media, such as that of gas suspensions, i.e., solid particles suspended in a gas. The mathematical model implemented a continuum approach to modeling the dynamics of inhomogeneous media, which implies taking into account intercomponent heat transfer and momentum exchange. The carrier medium was described as a viscous, compressible, heat-conducting gas, the equations of the model were supplemented with initial and boundary conditions, and the system of the equations was integrated by an explicit finite-difference method. To obtain a monotonic grid function, a nonlinear scheme for correcting the numerical solution was used. The mathematical model was supplemented with the Poisson equation describing the electric field, which is formed by electrically charged disperse inclusions. The Poisson equation was integrated by finite-difference methods on a gas-dynamic grid. The flow of a gas suspension caused by the motion of dispersed particles under the action of the Coulomb force was studied numerically. Flows of gas suspensions with surface and mass densities of electric charge were modeled. For the surface charge density model, the Coulomb force acting on the unit mass of the gas suspension increases with a decrease in the dispersion of particles. For the mass charge density, the dispersion of particles does not affect the specific Coulomb force acting on the particles. The intensity of the gas suspension flow increases with decreasing particle size, both for the mass and surface models of charge density. For the surface charge density model, as the particle size decreases, the intensity of the gas pressure drop in the emerging gas suspension flow increases more than when modeling the gas suspension dynamics with\u0000a mass distribution of the electric charge density","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81931199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Investigation of Work Cycle Characteristics in the Combustion Chamber of a Lox/Methane Liquid-Propellant Rocket Engine Featuring Reductant Power Gas Combustion 还原剂动力气体燃烧液氧/甲烷液体推进剂火箭发动机燃烧室工作循环特性数值研究

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/0236-3941-2022-2-43-53

D. A. Sidlerov, S. Fedorov

{"title":"Numerical Investigation of Work Cycle Characteristics in the Combustion Chamber of a Lox/Methane Liquid-Propellant Rocket Engine Featuring Reductant Power Gas Combustion","authors":"D. A. Sidlerov, S. Fedorov","doi":"10.18698/0236-3941-2022-2-43-53","DOIUrl":"https://doi.org/10.18698/0236-3941-2022-2-43-53","url":null,"abstract":"We performed a numerical investigation of cumulative efficiency and the structure in detail concerning the working process in the combustion chamber of a lox/methane liquid-propellant rocket engine operating in steady-state, boosted and throttled modes. In order to do it, we used tools developed by JSC SSC \"Center Keldysh\", that is, physical and mathematical models, numerical methods and software packages for numerical simulation of two-phase turbulent flows with combustion in liquid-propellant engine combustion chambers. The paper presents numerical simulation and investigation results concerning the specifics of fuel component flows, their mixing and combustion in the combustion chamber of a lox/methane liquid-propellant rocket engine using staged combustion cycle with reductant gas in steady-state, boosted (117 % by thrust) and throttled (30 % by thrust) operation modes. We performed a comparative analysis of work cycle parameters in combustion chambers at different fuel component consumption rates and pressure levels. The paper shows that the boosted mode increases the interaction of fuel jets, which intensifies mixing and burnout processes, while the deep throttling mode decreases the mixing and fuel burnout amplitudes as compared to the steady-state mode. The numerical simulation results may be used to investigate fuel combustion processes in combustion chambers of promising liquid-propellant rocket engines at the stages of development, design and refinement","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81336566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Notes on Strongly Semi-Closed Graph 关于强半闭图的注意事项

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/1812-3368-2022-3-17-27

A. Alkhazragy, A. Al-Hachami, F. Mayah

引用次数: 4

Experimental Analysis of Elemental Composition of Materials used to Manufacture Gas Generators for Vehicle Airbag Modules 汽车安全气囊模块气体发生器材料元素组成试验分析

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-06-01 DOI: 10.18698/0236-3941-2022-2-75-88

Astua A. V. Gonsales, R. Goncharov, T. S. Malishchuk

{"title":"Experimental Analysis of Elemental Composition of Materials used to Manufacture Gas Generators for Vehicle Airbag Modules","authors":"Astua A. V. Gonsales, R. Goncharov, T. S. Malishchuk","doi":"10.18698/0236-3941-2022-2-75-88","DOIUrl":"https://doi.org/10.18698/0236-3941-2022-2-75-88","url":null,"abstract":"The airbag is a part of the Supplementary Restraint System; along with the safety belt, it is the most important system that protects the driver and passengers if the vehicle collides with static or moving objects. Certain interrelated studies and measures are required so as to develop scientific, technical, design and technological foundations for producing airbag modules for various vehicle types: for example, determining the range of suitable domestic materials and alloys, as well as the compositions of pyrotechnic gas-generating charges to manufacture gas generators. We experimentally evaluated mechanical properties and elemental composition of materials that gas generator parts consist of, which allowed us to establish their domestic analogues. We determined the elemental chemical composition of pyrotechnic gas-generating charges (main and auxiliary) and the primer igniter charge. We used the following methods in our work: an experimental full-scale airbag module deactivation method for subsequently decomposing gas generators to obtain the necessary sample parts to investigate; a method for determining the microhardness of material samples to subsequently evaluate their ultimate tensile strengths; finally, laser-induced breakdown spectroscopy, X-ray fluorescence spectrometry, X-ray and infrared spectroscopy, ion and liquid chromatography, Raman spectroscopy and nuclear magnetic resonance to determine the elemental composition of materials","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79150162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2