Herald of the Bauman Moscow State Technical University. Series Natural Sciences最新文献_第7页

Vapor-Liquid Equilibrium Study in the Alcohol Binary Solutions using the Cluster Model 用聚类模型研究醇二元溶液的汽液平衡

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-161-172

M.S. Mitrofanov, E. A. Ananyeva, V. Sergievskii

{"title":"Vapor-Liquid Equilibrium Study in the Alcohol Binary Solutions using the Cluster Model","authors":"M.S. Mitrofanov, E. A. Ananyeva, V. Sergievskii","doi":"10.18698/1812-3368-2023-1-161-172","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-161-172","url":null,"abstract":"The vapor-liquid equilibrium was analyzed for infinitely miscible binary solutions of alcohols exhibiting positive deviations from the Raoult’s law on the basis of the cluster model. The considered substances were by-products of the Fischer --- Tropsch process and various additives to the biofuel. Cluster model equation was provided to describe concentration dependences of vapor pressure over the solution on composition of the liquid phase. The model applicability included non-electrolyte solutions, which deviation from ideality was caused by preferential association of one of the solution components. The model equations parameters were the mathematical expectations of the associates’ distribution in standard state and dispersion of the association number. It is shown that the model equations adequately describe experimental data on vapor pressure for mixtures of various aliphatic alcohols with diethyl carbonate and ketones. For mixtures of hydrocarbons with pentanol isomers, the previously formalized method for simulating vapor pressure along concentration dependences of the mixture excess molar characteristics on the liquid phase composition was applied. It was established that solutions obtained by various methods are in good agreement with each other and adequately describe concentration dependences of the vapor pressure on composition of the liquid phase","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"1 1-2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88298122","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 Analysis of the Effect of Longitudinal and Transverse Pitch Ratio on the Flow Characteristic of Staggered Drop-Shaped Tubes Bundle 纵向和横向节距比对交错水滴形管束流动特性影响的数值分析

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-95-116

R. Deeb

引用次数: 1

Determination of the Dependence of the Spectrophotometer Zero Line Speed Deviation on the Elution Parameters Alteration 测定分光光度计零线速度偏差对洗脱参数变化的依赖性

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-129-144

S. Stankevich, N.K. Lysenko

{"title":"Determination of the Dependence of the Spectrophotometer Zero Line Speed Deviation on the Elution Parameters Alteration","authors":"S. Stankevich, N.K. Lysenko","doi":"10.18698/1812-3368-2023-1-129-144","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-129-144","url":null,"abstract":"To identify dependence of the drift rate on the elution parameters alteration (in high-performance liquid chromatography), four samples of chromatograms registered by the Milichrome A-02 liquid microcolumn chromatograph were formed and compared in pairs. This chromatograph was equipped with a two-beam spectrophotometric detector with the following operating spectrum, nm: 210; 220; 230; 240; 250; 260; 280; 300. To determine dependence of the drift rate on the elution parameters, comparison was made of the two samples average drift rates, which differed only in the parameter value under study. Hypothesis about the eluate temperature alteration effect on the drift rate was confirmed at the highest level of confidence. It was established that the drift rate increased in the most (by 26.54 times) precisely with an increase in the temperature by 10 °С. Twofold increase in the eluate rate led to an increase in the average drift rate over the spectrum by 81.65 %, and the twofold increase in the detector measurement interval --- by 33.82 % (despite this, hypothesis of this relationship was taken as false). Along with the temperature, activity of the eluate particles was increasing, and the amount of energy required for the electron transition to the higher energy levels decreased. The problem of drift readings is universal and relevant for many measurement instruments. Drift is caused by systematic alteration in the metrological characteristics of the measurement tool. As a result of the detector electromagnetic radiation energy absorption by particles dissolved in the eluate, such metrological characteristic of the spectrophotometric detector as the radiation intensity changes; and it changes randomly, which in 87.5 % of cases leads to a positive drift, and in 12.5 % --- to the negative drift","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83092954","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

Real Power Loss Reduction by Enhanced Russian Haliaeetus Pelagicus Optimization 通过改进俄罗斯对虾优化降低实际功率损耗

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-64-81

L. Kanagasabai

{"title":"Real Power Loss Reduction by Enhanced Russian Haliaeetus Pelagicus Optimization","authors":"L. Kanagasabai","doi":"10.18698/1812-3368-2023-1-64-81","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-64-81","url":null,"abstract":"In this paper Enhanced Russian Haliaeetus pelagicus Optimization Algorithm is applied for solving the Power loss lessening problem. Russian Haliaeetus pelagicus Optimization Algorithm is modeled based on the natural deeds of Russian Haliaeetus pelagicus. A spiral trajectory for exploration and a straight-line lane for assails done by Russian Haliaeetus pelagicus for hunting. It shows proclivity to sail in preliminary phase of hunting and efficiently changeover to further proclivity to assail in the concluding phases. Russian Haliaeetus pelagicus conserve proclivity for both sail and assail in each instant of the voyage. Sail vector is computed based on the assail vector. Sail vector is a tangent to the loop and vertical to the assail vector. The sail can be linear pace of Russian Haliaeetus pelagicus in comparison the prey. The sail vector in n-dimensions is situated within the tangent plane in loop in order compute the sail vector. In Enhanced Russian Haliaeetus pelagicus Optimization Algorithm exterior archive, prey precedence condition, and picking of prey are added through multi-objective mode. The fundamental plan is to keep capable solutions in an exterior archive and modernize when procedure continues. Exploration agents are moved in the direction of the stored entities. If the new-fangled solution is conquered by one or more of the present archives' entities, then the new-fangled solution is removed. If the new-fangled solution is not ruled over the present entities of the stored one and the records are not occupied, basically append the new-fangled position to the store. Prudence of the Enhanced Russian Haliaeetus pelagicus Optimization Algorithm is corroborated in IEEE 30 bus system (with and devoid of L-index). True power loss lessening is reached. Ratio of true power loss lessening is augmented","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78287627","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 Schemes Comparison in Solving the Problem of Laminar Flow in the Suddenly Expanding Channel 求解突然膨胀通道层流问题的数值方案比较

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-4-22

M. Madaliev

{"title":"Numerical Schemes Comparison in Solving the Problem of Laminar Flow in the Suddenly Expanding Channel","authors":"M. Madaliev","doi":"10.18698/1812-3368-2023-1-4-22","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-4-22","url":null,"abstract":"The paper studies fluid flow in a two-dimensional channel with sudden expansion (x/h = 2). Calculations were made for the laminar flow mode based on numerical integration of the nonstationary Navier --- Stokes equations. Various flow characteristics were determined at Re = 100--800. Results were obtained for the longitudinal speed profiles in various channel sections and lengths of the primary and secondary vortices at various values of the Reynolds number after the step. The friction coefficient distribution on the channel lower side along its length is presented for various values of the Reynolds number. For the difference approximation of the initial equations, the control volume method was applied; relationship between speed and pressure was found using the SIMPLE procedure. For numerical solution of the problem, the following QUICK schemes were introduced: McCormack's second-order accuracy, Warming --- Cutler --- Lomax's third-order accuracy and Abarbanel --- Gotlieb --- Turkel's fourth-order accuracy. To confirm correctness, numerical results were compared with the experimental data taken from the literature sources","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86258451","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

Default Sensor Network Setup based on the Anisotropic Criterion 基于各向异性准则的默认传感器网络设置

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-45-63

A. Yurchenkov

{"title":"Default Sensor Network Setup based on the Anisotropic Criterion","authors":"A. Yurchenkov","doi":"10.18698/1812-3368-2023-1-45-63","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-45-63","url":null,"abstract":"The paper considers the problem of setting up a communication scheme associated with the adjacency matrix between separate non-ideal sensors and known probability of their failsafe operation. As the evaluation object, a linear discrete non-stationary model in the state space was chosen, which was affected by external perturbations with the inaccurately specified stochastic characteristics. For external perturbations, upper limit of the anisotropy of the extended vector consisting of all the perturbing sequence elements was determined. Sensors were combined into a common network, where each separate node was able to use not only the own measurements to build an estimate of the desired output, but also the measurements received from the adjacent sensors. The model took into account the failure of specific sensors, where failures had the Bernoulli distribution. A failure should be understood as the random readings of a measurement device containing no useful information. The criterion is anisotropic norm of the system in the estimation errors from the perturbing action to the estimated output error. The problem was in selecting such adjacency matrix coefficients, where the anisotropic norm value in the estimation errors was not exceeding a certain threshold value. Solution to the problem was reduced to a numerical procedure of solving a special system of matrix inequalities ensuring boundedness of the system anisotropic norm in the estimation errors","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87002714","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

Computational Study of the Wall Electrization Limiting Characteristics at the Low-Temperature Plasma Flow 低温等离子体流动壁电极限特性的计算研究

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-145-160

K. Fedotova, D. A. Yagodnikov

{"title":"Computational Study of the Wall Electrization Limiting Characteristics at the Low-Temperature Plasma Flow","authors":"K. Fedotova, D. A. Yagodnikov","doi":"10.18698/1812-3368-2023-1-145-160","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-145-160","url":null,"abstract":"The purpose of this work lies in computational study of the floating potential distribution in the perturbed zone adjacent to the wall in the ionized flow of low-temperature plasma. As a result of electrophysical interaction, primary and secondary emission currents appear on the wall surface. Based on the probe theory, mathematical model was developed to determine the current values of the combustion products ionized flow and spatial potential on the surface of walls in the power plant flow path. Parametric calculation of the potential on the wall at its contact with the low-temperature plasma was carried out without and taking into account the secondary emission processes. The results obtained taking into account only the primary currents demonstrate alteration in the potential on the wall in the range of --(1.5--0.5) V at the plasma flow temperature of 1,000--3,500 K. Results are presented of the design research of the wall floating potential dependence with various secondary electron emission coefficients in comparison with the known experimental results. Metal walls were characterized by formation of a shielding layer, where only the primary currents appeared. It is shown that their floating potential changes the sign in dielectric walls, as coefficient of the secondary electron emission decreases. Parametric calculation of the current value near the wall was carried out showing that with an increase in pressure by 0.1--10 MPa, the current value was changing in the range of 0.005--0.025 A","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85203571","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

Plasticization of Alumina Toughened Zirconia Ceramics with the Silica Addition 添加二氧化硅对氧化铝增韧氧化锆陶瓷的增塑作用

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2023-02-01 DOI: 10.18698/1812-3368-2023-1-117-128

P. N. Ovchinnikov, N. Efremova, D. G. Zhigacheva, V. M. Vasyukov, V. V. Rodaev, A. Dmitrievskiy

{"title":"Plasticization of Alumina Toughened Zirconia Ceramics with the Silica Addition","authors":"P. N. Ovchinnikov, N. Efremova, D. G. Zhigacheva, V. M. Vasyukov, V. V. Rodaev, A. Dmitrievskiy","doi":"10.18698/1812-3368-2023-1-117-128","DOIUrl":"https://doi.org/10.18698/1812-3368-2023-1-117-128","url":null,"abstract":"The purpose of this work is to study features of deformation at the room temperature by the method of uniaxial compression of alumina toughened zirconia ceramics (stabilized with calcium oxide) with different content of the silicon dioxide (CaO-ATZ+SiO2). It was found that SiO2 addition to the CaO-ATZ-ceramic ensured manifestation of the signs of plasticity at the room temperature, i.e., yield stage in the loading diagrams. The most pronounced plasticization was manifested at the silicon dioxide content of 4 mol. %. In this case, plastic deformation (calculated as the difference between deformations corresponding to the tensile strength and conditional yield strength) reached the 0.79 % value. In addition, introduction of the SiO2 additive (2 mol. % concentration) caused an increase in the ultimate compressive strength to the value of 2.66 GPa and ultimate strain to the value of 1.79 %. It was shown that exceeding the threshold value of the SiO2 concentration (by more than 4.5 mol. %) caused a sharp embrittlement of the CaO-ATZ+SiO2-ceramics. Discovered ceramics plasticity at the room temperature is explained by an increase in the tetragonal phase transformability of zirconium dioxide, which enhances the role of the transformation toughening mechanism. Plasticity margin of the composite ceramics based on the zirconium dioxide was achieved at the room temperature and provides a prospect for expanding the area of its practical applications","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80341400","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

On Selecting a Method of Constructing a Fuzzy Model for Prediction of the Battery State 电池状态模糊预测模型的选择方法研究

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-12-01 DOI: 10.18698/0236-3933-2022-4-36-55

O. Yakovleva, Y. Stroganov, I. V. Rudakov

{"title":"On Selecting a Method of Constructing a Fuzzy Model for Prediction of the Battery State","authors":"O. Yakovleva, Y. Stroganov, I. V. Rudakov","doi":"10.18698/0236-3933-2022-4-36-55","DOIUrl":"https://doi.org/10.18698/0236-3933-2022-4-36-55","url":null,"abstract":"Battery-powered electric vehicles are being currently considered to replace conventional non-environmental vehicles. Batteries could not be used without a control system, which development requires a mathematical model to predict the state of a separate battery. The Takagi --- Sugeno fuzzy system (fuzzy model) could become such a model. There are methods for automatic construction of fuzzy models according to the table of observations. However, unambiguous criteriafor selecting the appropriate method in each specific case are missing. The problem is considered of determining a method making it possible to obtain a fuzzy model that predicts the lithiumion battery voltage from the load current and the state of charge when discharging with direct current with the lowest meansquare error. The existing methods and their classes were reviewed, and five methods were selected for comparison. Prediction error by all the models obtained was unevenly distributed along the axis of the charge state, and it took the highest values in the range of 97--100 %. The lowest meansquare error was registered in the model built by the combined method using subtractive clustering, least squares method and adaptive network based on the adaptive neurofuzzy inference system. The error in such model was changing stepwise, which was associated with feature of the subtractive clustering algorithm, i.e., the formed clusters were of the same size","PeriodicalId":12961,"journal":{"name":"Herald of the Bauman Moscow State Technical University. Series Natural Sciences","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74189226","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

The Motion of a Charged Particle in the Electromagnetic Field of a Polarization-Modulated Wave 极化调制波电磁场中带电粒子的运动

Herald of the Bauman Moscow State Technical University. Series Natural Sciences Pub Date : 2022-12-01 DOI: 10.18698/1812-3368-2022-6-106-122

G. Kopytov, D. Kudryavtsev, V. Brazhko

引用次数: 0