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Articles 77761 - 77790 of 196126

Full-Text Articles in Engineering

Method Of Calculation Of Static Regime Of Rectification Columns For Optimization Of Constructive And Technological Parameters On Mathcad Prime 3.0., D.P Muxitdinov, Yo.B Kadirov Apr 2018

Method Of Calculation Of Static Regime Of Rectification Columns For Optimization Of Constructive And Technological Parameters On Mathcad Prime 3.0., D.P Muxitdinov, Yo.B Kadirov

Chemical Technology, Control and Management

The calculation of the statics of the rectification process is considered. The method of calculating the material and heat balances in the program MathCAD Prime 3.0 is presented. The proposed method involves calculating the pressure in a column based on the preliminary determination of the temperature of the total condensation of distillate vapors, the complexity of which is due to the nonlinear character of the dependence of the equilibrium constants on temperature. According to the Underwood equations, the minimum and working reflux ratio is calculated in the processes of multicomponent rectification. The theoretical number of plates of the column is …

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Process Modeling Of Optimum Mixing Of Cyanic Solutions With Use Of Intellectual Systems Of Measurement On A Basis To A Fuzzy Logic, O.A Jumayev, A.A Akhmatov, G.B Makhmudov Apr 2018

Process Modeling Of Optimum Mixing Of Cyanic Solutions With Use Of Intellectual Systems Of Measurement On A Basis To A Fuzzy Logic, O.A Jumayev, A.A Akhmatov, G.B Makhmudov

Chemical Technology, Control and Management

Analyzes the principles of the development of microprocessor-based intelligent measurement and control systems that operate based on fuzzy logic rules. Using the possibilities of microprocessor intelligent systems, methods of automatic adjustment of the selected regulator are based on the dynamic model of the object, using the example of the process of optimal displacement of cyanide solutions.

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Optimization Of Latent Properties Extraction And Data Processing Of Non-Stationary Objects On The Basis Of Fuzzy Genetic Algorithms, I Jumanov, Z.T Bekmurodov, U.Z Jumayozov Apr 2018

Optimization Of Latent Properties Extraction And Data Processing Of Non-Stationary Objects On The Basis Of Fuzzy Genetic Algorithms, I Jumanov, Z.T Bekmurodov, U.Z Jumayozov

Chemical Technology, Control and Management

The problem is formulated for providing the quality of identification and optimization during data processing of non-stationary objects on the basis of improving and developing methods to extraction and use latent properties of data by generalization of features of statistical and dynamic models, fuzzy sets and fuzzy logic, genetic algorithms (GA). The methods and algorithms are developed to filtering non-stationary components of random time series (RTS) on the basis of statistical strategy, threshold methods, computing circuits of traditional and fuzzy GA. Results of tasks solutions represent mathematical expressions to evaluate the location level and width of optimum borders of control, …

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Estimation Of Quality And Safety Of Honey Of Ukraine In Accordance With International Criteria, L.V Bal-Prylypko, O.A Lesnestkaya, V.O Ushkalov, O.V Volosyanka Apr 2018

Estimation Of Quality And Safety Of Honey Of Ukraine In Accordance With International Criteria, L.V Bal-Prylypko, O.A Lesnestkaya, V.O Ushkalov, O.V Volosyanka

Chemical Technology, Control and Management

There were studied the physicochemical indices of quality of natural honey normalized in Ukraine and abroad. The dominant ones that determine the level of its quality are the mass fractions of sugars, proline and diastase number, and the principal compound which presence determines the level of safety of honey for health of consumers is hydroxymethylfurfural. There was carried out the analysis of nine specimens of natural honey sampled in all regions of Ukraine and shown that their quality conforms to norms of European directive and international standard for honey.

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Mathematical Models Of The New Induction Sensor Of Big Currents, S.F Amirov, D.Sh Rustamov Apr 2018

Mathematical Models Of The New Induction Sensor Of Big Currents, S.F Amirov, D.Sh Rustamov

Chemical Technology, Control and Management

Generalized mathematical models of a new high current induction sensor are developed, taking into account the distribution of electrical and magnetic parameters of the modulation circuits and the measured current, as well as the nonlinearity of the main magnetization curve. It is shown that the magnetic flux in the modulation magnetic circuit is unstable along the magnetic circuit and has a maximum value at the magnetic neutral point, and with an increase in the magnetic field attenuation coefficient in the magnetic flux, the flux is unstable and the magnetic flux in the magnetic circuit with the current being converted is …

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Methodological Aspects Of Continuous Controlling And Diagnostics Traction Electrical Equipments Using Methods Of Spectral Analysis, M.S Yakubov, Z.G Muxamedova, U.Sh Isroilov, J.S Fayzullaev Apr 2018

Methodological Aspects Of Continuous Controlling And Diagnostics Traction Electrical Equipments Using Methods Of Spectral Analysis, M.S Yakubov, Z.G Muxamedova, U.Sh Isroilov, J.S Fayzullaev

Chemical Technology, Control and Management

The work shows the high efficiency of diagnosing electrical equipment using the modulated stator current of electrical machines associated with rotor defects, with the presence of interturn and interphase closures, the vibriation-diagnostic parameters of their bearings, as well as the harmonic components of combinational frequencies and pulsations, appearing but for the non-linear volt-amperic characteristics of traction transformer and for the converters of electric locomotives. The scheme of integral informational environment of continuous diagnostics of electric devices of railway energetics was given.

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The Choice Of The Optimal Mode Of Discharge Of The Resirvoir Water, Yu.G Shipulin, B.G Zayniddinov, Z.A Zayniddinova, I.R Jurakulov Apr 2018

The Choice Of The Optimal Mode Of Discharge Of The Resirvoir Water, Yu.G Shipulin, B.G Zayniddinov, Z.A Zayniddinova, I.R Jurakulov

Chemical Technology, Control and Management

Optimal controlling volume in water reservoirs it is necessary computation the optimal coefficients of the system. For this purpose was proposed an method for calculating the coefficients of the optimal control water level in reservoirs on the basis of "standard coefficients." It provides the optimality of the process of the controlling water volume in a water chain of two reservoirs by taking into account optimum coefficients which calculated by this method and the restrictions on the parameters of the control.

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Steady Synthesis Algorithms Of The Adaptive Observers In Control Systems Dynamic Objects, H.Z Igamberdiyev, A.H Rasulev Apr 2018

Steady Synthesis Algorithms Of The Adaptive Observers In Control Systems Dynamic Objects, H.Z Igamberdiyev, A.H Rasulev

Chemical Technology, Control and Management

The problems of synthesis of adaptive observers are considered, for linear dynamic systems containing parameter identifiers, estimators of the initial and current state vectors. For a stable estimation of object parameters, an iterative process is used, based on the normalized decomposition of the matrix operator of the identification equation. These algorithms allow the stable identification of the parameters of the controlled objects on the basis of the use of regular computational procedures and thereby improve the quality of the functioning of the adaptive observing device.

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Work Of Firewall In Special Filtration Of Traffic, M.M Karimov, Sh.R Gulyamov, S.M Sagatova Apr 2018

Work Of Firewall In Special Filtration Of Traffic, M.M Karimov, Sh.R Gulyamov, S.M Sagatova

Chemical Technology, Control and Management

This article is devoted to the functioning firewall on special traffic filtering, which allows to increase the security of network traffic, taking into account the control over the process of packet exchange by protocols, blocking attacks associated with improperly setting flags, and providing network address translation for application, transport and network protocols. Network address translation for application, transport and network protocols reduces packet loss when data is transmitted, that under decrease packet loss, the implementation of threats and attacks from the attacker is reduced.

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Increase Of Identification Quality On The Basis Of Genetic Adjustment Of Models Parameters For Description Non-Stationary Objects, A.R Akhatov, N.O Isroilov Apr 2018

Increase Of Identification Quality On The Basis Of Genetic Adjustment Of Models Parameters For Description Non-Stationary Objects, A.R Akhatov, N.O Isroilov

Chemical Technology, Control and Management

Paper formulated the problem of increasing the quality of identification for casual time series (CTS), representing non-stationary objects in multicontour control systems on the basis of effective search of global and local extremums when parameters of target optimization function are rational. The new approach is offered to optimization of search by consideration statistical and dynamic characteristics of CTS as specimen of population generation, and by reflection of coordinate points set in space of evolution toward optimal values of target function. The modified genetic algorithm (GA) is developed on the basis of overlapping, generalization of opportunities and use of properties of …

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Investigation Of Magnesium Containing And Calcium Ammonium Nitrate Obtainment Process, A.A Nabiev, A.M Reymov, Sh.S Namazov, B.M Beglov Apr 2018

Investigation Of Magnesium Containing And Calcium Ammonium Nitrate Obtainment Process, A.A Nabiev, A.M Reymov, Sh.S Namazov, B.M Beglov

Chemical Technology, Control and Management

In this article the results of process for obtaining magnesium containing carbonate ammonium nitrate (CAN) by interaction of ammonium nitrate melt in dolomite mineral (DM) from “Shorsu”, Fergana region, have been given. Mass ratio of AN:DM is varied from 100 : 3 tо 100 : 35. The prilling method was used to granulate nitrate-carbonate melt. It was determined that the composition and property of fertilizer obtained. The possibility of granular fertilizer production with content of 25.49-32.77% of nitrogen, 0.90-8.09% СаО, 0.56-4.97% MgO and petty amount of potassium was shown. The main task for modification of AN is increasing strength of …

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Sulfo Aluminate-Silicate Cement Based On Phosphogypsium, N.E Shamadinova, Kh.A Adinaev, T.A Atakuziev Apr 2018

Sulfo Aluminate-Silicate Cement Based On Phosphogypsium, N.E Shamadinova, Kh.A Adinaev, T.A Atakuziev

Chemical Technology, Control and Management

It is shown that in industrial conditions it is possible to obtain a clinker based on phosphogypsum, limestone and kaolinite clay at a roasting temperature of 200-3000C below the burning temperature of Portland cement. As a result of the research was created a low-temperature roasting cement. The obtained cements gain high solidity, especially in the initial periods. It is established that based on these cements and Portland cement can be obtained various types of cements of special purpose.

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Calculation Of The Rate Of Entrainment In Three-Phase Fluidization With Solid Non-Uniform Mixtures, A.Sh Abdullaev, O.Sh Temirov, Kh.S Nurmuhamedov Apr 2018

Calculation Of The Rate Of Entrainment In Three-Phase Fluidization With Solid Non-Uniform Mixtures, A.Sh Abdullaev, O.Sh Temirov, Kh.S Nurmuhamedov

Chemical Technology, Control and Management

Article is devoted to determination of critical speeds of a compound from solid bodies with sharply different physicomechanical properties in a three-phase fluidized layer. Critical speeds, in particular, the speed of ablation of wab of a thin skin of root crops, in the form of a thin plate of irregular shape are defined. Results on critical speed of ablation considerably differ from the estimated values received on a formula Todes O.M. Therefore, for increase in accuracy of determination of critical speed of ablation of a three-phase fluidized layer the correlation considering a factor of the form and sailing of bodies …

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Resershese Fire Wood For Production Building Konstruction, U.I Rustamov, A.J Khabibullaev, B.A Mukhamedgaliev Apr 2018

Resershese Fire Wood For Production Building Konstruction, U.I Rustamov, A.J Khabibullaev, B.A Mukhamedgaliev

Chemical Technology, Control and Management

Some specific features of combustion and smoke formation of wood materials, as well as toxicity of gases released from combustion of local wood, are studied. It is established that the concentration of the released smoke and its nature depend on the structural features and chemical composition of the combustible material. It was found that the beginning of the exothermic decomposition of wood begins at a temperature of 270-280 ° C. In this process, a significant amount of heat is released during the process. For calcareous wood, the heat of decomposition is 260 kcal / kg. This heat is sufficient for …

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Optimization Of The Method Of Synthesis Of Thermoplastic Copolymers Based On Acrylic And Vinyl Monomers For Shoe Suspended Materials, A.T Ibragimov, A.Z Mamatov, D.M Maxmanov Apr 2018

Optimization Of The Method Of Synthesis Of Thermoplastic Copolymers Based On Acrylic And Vinyl Monomers For Shoe Suspended Materials, A.T Ibragimov, A.Z Mamatov, D.M Maxmanov

Chemical Technology, Control and Management

In order to optimize the synthesis of thermoplastic copolymers for shoe sole materials, a mathematical model of the process involving acrylic and vinyl monomers has been developed. The kinetic parameters of copolymerization at the optimum content of initial monomers and the thermal processing regime are investigated. The regressive equations of the synthesis process, which takes place in the heterogeneous phase with incoming factors and outgoing copolymerization parameters, are calculated. The comparative parameters of optimization of the synthesis process, as well as the molecular characteristics and structure of copolymers with the optimal composition, are estimated mathematically by the data obtained.

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The Condensing Polymeric Compositions On The Basis Of Akrilat And Polysaccharides, K.A Ravshanov, B. Olimov Apr 2018

The Condensing Polymeric Compositions On The Basis Of Akrilat And Polysaccharides, K.A Ravshanov, B. Olimov

Chemical Technology, Control and Management

The possibilities of using starch and its derivatives as a thickener for printing with various dyes, establishing the printing-technical properties of starch with GAE and PAA for packing cotton fabrics have been studied. The properties of the printed fabric of the effect of the composition on the strength of the color on various physicochemical effects, as well as the smoothness and brightness of the color, were studied.

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Development Of Technology On The Hydrochloric-, Nitric- And Sulfuric Acid Processing Of Low-Grade Phosphorites Of Central Kyzylkum, T.I Nurmurodov, A.U Erkaev, B.Kh Kucharov Apr 2018

Development Of Technology On The Hydrochloric-, Nitric- And Sulfuric Acid Processing Of Low-Grade Phosphorites Of Central Kyzylkum, T.I Nurmurodov, A.U Erkaev, B.Kh Kucharov

Chemical Technology, Control and Management

The rheological properties of ammoniated mother liquors have been studied and the technology of processing low-grade phosphorites of the Central Kyzylkum with salt and nitrogen-sulfuric acid methods has been developed and it has been shown that the suspensions formed are processability for obtaining complex phosphorus fertilizers and purified precipitate.

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Imitation Model Of The Chemical Reactor Control System, I.H Siddiqov, S.B Atajonova Apr 2018

Imitation Model Of The Chemical Reactor Control System, I.H Siddiqov, S.B Atajonova

Chemical Technology, Control and Management

The paper deals with the construction of an imitation model of the chemical reactor control system, for investigating the dynamic properties of the process. Computational model of the object is developed, based on the Simulink package of the MATLAB program. Because of the simulated experiment, the main factor affecting the temperature regime of the chemical reactor was identified and the regulating parameter - steam flow, significantly influencing the process.

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The Algorithm Of Classification Of Medical Data In Space Of The Informative Signs With Use Of Functions Of Range And Closeness, M.M Kamilov, A.H Nishanov, G.P Dzhurayev Apr 2018

The Algorithm Of Classification Of Medical Data In Space Of The Informative Signs With Use Of Functions Of Range And Closeness, M.M Kamilov, A.H Nishanov, G.P Dzhurayev

Chemical Technology, Control and Management

In the article, the diseases commonly associated with the diagnosis in medicine are associated with headaches, which are the most common neurological diseases. An algorithm for determining the space of informative attributes for the objects of the considered class and assigning the significance level of the selected diagnosis from a complex of diagnoses belonging to the same class, relative to others, using algorithms for computing estimates based on the features of the processes of making diagnostic decisions in medicine.

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Analysis Of The Mathematical Methods For Determination Information Parameter Described By Gauss's Function, O.O Zaripov, G.Sh Abidova Apr 2018

Analysis Of The Mathematical Methods For Determination Information Parameter Described By Gauss's Function, O.O Zaripov, G.Sh Abidova

Chemical Technology, Control and Management

Results of the analysis of the mathematical methods are considered in article for determination information parameter, described by Gauss's function. It is shown that at present nanotechnologies stand out in independent scientific direction, which gives the new pulse for development of the branches of the economy. The presented curves characterizing group merged peak, described function Gausses. On base got result of the analysis of the mathematical models, defining information parameters peak, occurs the simplification at building hardware device, information parameters under investigation peak.

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Algorithms Of Stable Control Of A Matrix Object In The Conditions Of Parametric Uncertainty, U.F Mamirov Apr 2018

Algorithms Of Stable Control Of A Matrix Object In The Conditions Of Parametric Uncertainty, U.F Mamirov

Chemical Technology, Control and Management

The problems of forming algorithms for stable control of a matrix object under conditions of parametric uncertainty are considered. Algorithms for managing the object under consideration using the matrix pseudoinversion procedure are given. Recurrent algorithms based on the fringing method are used for pseudo-inversion of matrices. These relations allow us to implement recurrent pseudo-inversion of matrices in the control algorithm and, thereby, realize control actions in the adaptive control system of the matrix object under uncertainty conditions.

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Preparation Of Ni(Dpim)2Cl2 Complex For The Electrocatalytic Reduction Of Co2, Li-Pu Zhang, Dong-Fang Niu, Xin-Sheng Zhang Apr 2018

Preparation Of Ni(Dpim)2Cl2 Complex For The Electrocatalytic Reduction Of Co2, Li-Pu Zhang, Dong-Fang Niu, Xin-Sheng Zhang

Journal of Electrochemistry

A new Ni(dpim)2Cl2complex using 2-(diphenylphosphino)-1-methylimidazole (dpim) as ligand was prepared and served as a catalyst for the electrochemical reduction of CO2. The electrochemical redox behavior of Ni(dpim)2Cl2 in CH3CN/TPABF4 solution under nitrogen atmosphere showed the two-electron irreversible reduction at -0.7 V and one-electron quasi-reversible reduction at -1.3 V. After bubbling CO2 into the electrolyte, the reduction peak appeared at -1.3 V became irreversible and the peak current increased from 0.48 mA·cm-2 to 0.55 mA·cm-2. Moreover, the peak current at -1.3 V could further increase …

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Preparation And Properties Of Manganese Oxide And Polyaniline-Carbon Composite Electrode, Tian-Tian Zhou, Bing Wu, Chao Deng, Ying Gao Apr 2018

Preparation And Properties Of Manganese Oxide And Polyaniline-Carbon Composite Electrode, Tian-Tian Zhou, Bing Wu, Chao Deng, Ying Gao

Journal of Electrochemistry

The polyaniline-carbon (PAnC) electrode was prepared by the polymerization of aniline monomer and activated carbon in ice water bath, and followed by chemical deposition of manganese dioxide MnO2-PAnC composite material. The specific capacitance of MnO2-PAnC reached 459 F•g-1. The cyclic voltammetric results showed a small deformation in the voltammogram curve obtained with the MnO2-PAnC electrode at high scan rate, indicating good reversibility and capacitive properties. The AC impedance results revealed that the MnO2-PAnC electrode displayed the smallest charge transfer resistance and the fastest diffusion
rate of surface ions than other …

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Preparation Of Co3O4/Ti Electrocatalytic Membrane Electrode For Catalytic Oxidation Of Benzyl Alcohol, Yu-Mei Zheng, Zhen Yin, Hong Wang, Jian-Xin Li Apr 2018

Preparation Of Co3O4/Ti Electrocatalytic Membrane Electrode For Catalytic Oxidation Of Benzyl Alcohol, Yu-Mei Zheng, Zhen Yin, Hong Wang, Jian-Xin Li

Journal of Electrochemistry

The cobalt oxide(Co3O4) nanoparticles were loaded on microporous Ti membrane to prepare Co3O4/Ti electrocatalytic membrane electrode by dip-coating method. The microstructures and electrochemical properties of Co3O4/Ti electrocatalytic membrane were investigated. The Co3O4/Ti electrocatalytic membrane reactor (ECMR) assembled by using the Co3O4/Ti electrocatalytic membrane as an anode was adopted for catalytic oxidation of benzyl alcohol to produce benzaldehyde and benzoic acid.The effects of different operation parameters on benzyl alcohol conversion, and selectivity to benzaldehyde and benzoic acid of ECMR were studied. …

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Simulation Analysis In Dynamic Performance Of Proton Exchange Membrane Fuel Cell Under Starting Condition, Yan Xiao, Ying-Jie Chang, Wei Zhang, Qiu-Hong Jia Apr 2018

Simulation Analysis In Dynamic Performance Of Proton Exchange Membrane Fuel Cell Under Starting Condition, Yan Xiao, Ying-Jie Chang, Wei Zhang, Qiu-Hong Jia

Journal of Electrochemistry

Based on the equivalent circuit model, by considering both the dynamic gas pressure model and the dynamic heat transfer model, a lumped parameter model is developed. The start process of the fuel cell is simulated by using SIMULINK software. The undershoot of the voltage is observed from the simulation results, and the response time of the voltage is basically the same as that of the fuel cell temperature, which indicates that the temperature has great influence on the dynamic performance of the fuel cell. From the perspective of the temperature, the dynamic responses of the thermodynamic potential, the activation overvoltage, …

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Interaction Between Energy And Electrocatalysis —— A Review On The 1st Young Scientist Forum On Energy Electrocatalysis, Hong Li, Wen-Bin Cai Apr 2018

Interaction Between Energy And Electrocatalysis —— A Review On The 1st Young Scientist Forum On Energy Electrocatalysis, Hong Li, Wen-Bin Cai

Journal of Electrochemistry

No abstract provided.

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Effects Of Rotating Magnetic Fields On Pem Fuel Cell Performance, Mao-Liang Wu, En-Ze Wang, Guang-De Pan, Zhong-Jun Liu, Fei Xie Apr 2018

Effects Of Rotating Magnetic Fields On Pem Fuel Cell Performance, Mao-Liang Wu, En-Ze Wang, Guang-De Pan, Zhong-Jun Liu, Fei Xie

Journal of Electrochemistry

Proton Exchange Membrane (PEM) fuel cell performance may be improved by application of additional magnetic fields. In this work, one square permanent magnet, made of either 16 combination cylinder magnets with homopolarity or 16 combination cylinder magnets with heteropolarity, was exerted on the fuel cell surface to produce additional magnetic field affecting PEM fuel cell performance. The influences of magnetic field status (rotating, static and none) on polarization and power density curves measured in a PEM fuel cell were investigated. The results verified the benefit of magnetic field, proving that the magnetic field distribution could improve the fuel cell output. …

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Educators’ Perceptions Of Integrated Stem: A Phenomenological Study, Brian K. Sandall, Darrel L. Sandall, Abram L. J. Walton Apr 2018

Educators’ Perceptions Of Integrated Stem: A Phenomenological Study, Brian K. Sandall, Darrel L. Sandall, Abram L. J. Walton

Journal of STEM Teacher Education

The study utilized a semistructured interview approach to identify phenomena that are related to integrated STEM education by addressing the question: What are the critical components of an integrated STEM definition and what critical factors are necessary for an integrated STEM definition’s implementation? Thirteen expert practitioners were identified and interviewed. The interviews were transcribed and analyzed for content in three different ways: by person, by interview question, and across all interviews using exploratory data analysis methods. Ten identified phenomena were grouped into two classes: structural implementation phenomena and interpersonal implementation phenomena. The structural implementation phenomena were: subject integration, project-based learning, …

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Making Connections: Evaluation Of A Professional Development Program For Teachers Focused On Stem Integration, Judy Lambert, Carmen Cioc, Sorin Cioc, Dawn Sandt Apr 2018

Making Connections: Evaluation Of A Professional Development Program For Teachers Focused On Stem Integration, Judy Lambert, Carmen Cioc, Sorin Cioc, Dawn Sandt

Journal of STEM Teacher Education

This article reports on a 2-year evaluation of a STEM integration professional development (PD) program for 40 math, science, and special education teachers in Grades 5–9 from a large Midwestern public school district. The National Research Council’s framework for integrated STEM education (Honey, Pearson, & Schweingruber, 2014) was used to explain the goals, outcomes, nature and scope, and implementation of the program. Teachers were measured on their growth in STEM content knowledge, technology integration, teaching confidence, pedagogical beliefs, and impact of PD. Increases resulted in all these areas with statistically significant improvements in most of them, particularly in Year 2. …

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Usu Aerospace Engineering Researcher Lands Prestigious Navy Grant, Usu College Of Engineering Apr 2018

Usu Aerospace Engineering Researcher Lands Prestigious Navy Grant, Usu College Of Engineering

College of Engineering News

Utah State University’s Doug Hunsaker, a rising star in aerodynamics research, received the coveted Young Investigator Program (YIP) award from the Office of Naval Research.

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