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2018

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Articles 4681 - 4710 of 8951

Full-Text Articles in Engineering

Redshirt In Engineering: A Model For Improving Equity And Inclusion, Donna C. Llewellyn, Ann Delaney, Janet Callahan Apr 2018

Redshirt In Engineering: A Model For Improving Equity And Inclusion, Donna C. Llewellyn, Ann Delaney, Janet Callahan

Materials Science and Engineering Faculty Publications and Presentations

The NSF-funded Redshirt in Engineering Consortium was formed in 2016 with the goal of enhancing the ability of academically talented but underprepared students coming from low-income backgrounds to successfully graduate with engineering degrees. The Consortium takes its name from the practice of redshirting in college athletics, with the idea of providing an extra year and support to help promising engineering students complete a bachelor’s degree. The Consortium builds on the success of three existing “academic redshirt” programs and expands the model to three new schools. The Existing Redshirt Institutions (ERIs) help mentor and train the new Student Success Partners (SSP), …

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Fatigue Equation Of Cement-Treated Aggregate Base Materials Under A True Stress Ratio, Songtao Lv, Chaochao Liu, Jingting Lan, Hongwei Zhang, Jianlong Zheng, Zhanping You Apr 2018

Fatigue Equation Of Cement-Treated Aggregate Base Materials Under A True Stress Ratio, Songtao Lv, Chaochao Liu, Jingting Lan, Hongwei Zhang, Jianlong Zheng, Zhanping You

Michigan Tech Publications, Part 1

The objective of this article is to establish a fatigue equation based on the true stress ratio for cement-treated aggregate base materials. The true stress ratio herein means the ratio of the stress and the true strength of the cement-treated aggregate base materials related to loading rates and curing times. The unconfined compressive strength tests and compressive resilience modulus tests were carried out under various loading rates and curing times of 3, 7, 14, 28, 60, 90 days, respectively. According to the test results, the relationship between the unconfined compressive strength (a mix design parameter in China) and the compressive …

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Synthesis And Electrochemical Properties Of Li3V2(Bo3)3/C Anode Materials For Lithium-Ion Batteries, You Wang, Yi-Wen Zeng, Xing Zhong, Xing Liu, Quan Tang Apr 2018

Synthesis And Electrochemical Properties Of Li3V2(Bo3)3/C Anode Materials For Lithium-Ion Batteries, You Wang, Yi-Wen Zeng, Xing Zhong, Xing Liu, Quan Tang

Journal of Electrochemistry

The Li3V2(BO3)3/C (LVB/C) composite materials were successfully synthesized in two steps:Firstly, a stoichiomertric mixture of Li2C2O4, V2O5, H3BO3, H2C2O4•H2O and ethanol was thoroughly ball-milled to get the precursors. Secondly, the precursors were post-calcinated to get the ultimate products. The calcination temperatures of 750 ℃, 800 ℃ and 850 ℃ were selected based on TG-DTA analyses. The crystal structures, surface morphologies and carbon contents of the samples calcinated at five conditions, …

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Electrochemical Performance Of Moo2-C Composite Coatings, Quan-Yi Li, Qi Yang, Yan-Hong Zhao Apr 2018

Electrochemical Performance Of Moo2-C Composite Coatings, Quan-Yi Li, Qi Yang, Yan-Hong Zhao

Journal of Electrochemistry

The molybdenum dioxide-carbon(MoO2-C)composite coatings on the surface of Cu foils were prepared by simple knife coating route and followed by sintering in vacuum. The morphology, composition, structure and electrochemical performance of the MoO2-C composite coatings were investigated. The results demonstrated that the MoO2-C composite coatings consist of MoO2 nano-particles with monoclinic crystal structure and amorphous carbon. Some MoO2 nano-particles with a size range of 5-30nm were loaded on the surface of carbon matrices; while some MoO2 nano-particles with a size of ~5nm were encapsulated inside. The composite coatings showed porous structure …

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Evaluation Of The Efficiency Of Various Deemulgators In The Destruction Of The Water-Efficient Emulsion Of Mingbulak Petrol, K.K Sharipov, J.A Haydarov Apr 2018

Evaluation Of The Efficiency Of Various Deemulgators In The Destruction Of The Water-Efficient Emulsion Of Mingbulak Petrol, K.K Sharipov, J.A Haydarov

Chemical Technology, Control and Management

Presents the results of the investigation of the efficiency of various demulsifiers in the destruction of the oil-water emulsion of Mingbulak oil. The purpose of this study is to evaluate the efficiency of demulsifiers used in industrial Electroinstallation plants for preparation of processing of high-viscosity oil. The laboratory experiments of the of demulsifier samples were carried out at the stable water-oil emulsion of Mingbulak oil was destroyed. Based on the results of the degree of destruction of emulsions was found the most effective in the destruction of the emulsion is 97%, about oil, demulsifier samples Dissolvan 3359 (at a demulsifier …

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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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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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Limits Of Existence Of The State Layer By Liquefaction Of Heterogeneous Mixture “Solid Body-Solid Body”., A.Sh Abdullaev, N.A Annaev, Kh.S Nurmuhamedov, S.K Nigmadjanov Apr 2018

Limits Of Existence Of The State Layer By Liquefaction Of Heterogeneous Mixture “Solid Body-Solid Body”., A.Sh Abdullaev, N.A Annaev, Kh.S Nurmuhamedov, S.K Nigmadjanov

Chemical Technology, Control and Management

In article are considered a status of layers for the systems "solid body-solid body" in case of liquefaction in the liquid environment when superimposing a gas flow and also critical speeds of a three-phase fluidized layer. The experimental data on the speed of the beginning of pseudo-liquefaction of Reps and ablation of Reab of bodies of irregular shape are generalized in the form of criteria formulas. Results on critical speeds slightly differ from the received estimated formulas. The received formulas describe boundaries of transition of statuses of a layer in a broad range of change of the equivalent diameter 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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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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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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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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Theoretical Research And Computer Simulation Of Composite Transistors Made Of A Semiconductor Material With The Same Of The Forbidden Band., N.B Alimova, A.A Yarmukhamedov Apr 2018

Theoretical Research And Computer Simulation Of Composite Transistors Made Of A Semiconductor Material With The Same Of The Forbidden Band., N.B Alimova, A.A Yarmukhamedov

Chemical Technology, Control and Management

Presents the results of theoretical research and computer simulation of composite transistors made of a semiconductor material with the same of the forbidden band. To study the volt-ampere characteristics of such composite transistors, an interactive computer simulation program was developed in the programming environment of Delphi-6. It is shown that the proposed transistors make it possible to improve manufacturability when it is manufactured industrially. The proposed composite transistors are designed for the final cascades of power amplifiers, radio transmitting devices.

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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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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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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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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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The Systems Concept To Mathematical Process Modeling Of Carbonization, I.H Siddikov, Z.E Iskandarov, D.B Yadgarova Apr 2018

The Systems Concept To Mathematical Process Modeling Of Carbonization, I.H Siddikov, Z.E Iskandarov, D.B Yadgarova

Chemical Technology, Control and Management

Considers a systematic approach to mathematical modeling of a complex, multistage carbonization process, which allows for taking into account the stoichiometric dependencies of the ongoing reactions. A kinetic model of the carbonization process based on chemical reactions in the carbonation column is proposed, which is the basis for obtaining the functional dependence in the form of a mathematical model of the main indicator of process quality-the degree of sodium utilization from the outlet streams of the carbonation column. The proposed systematic approach to the development of mathematical models based on stoichiometric ratios and the coefficients of reversibility of the ongoing …

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Extraction Of Dog Rose Seed With Supercritical Carbon Dioxide, J. Hasanov, . A Berdiev, Zhang Miansong, Zhang Yu Apr 2018

Extraction Of Dog Rose Seed With Supercritical Carbon Dioxide, J. Hasanov, . A Berdiev, Zhang Miansong, Zhang Yu

Chemical Technology, Control and Management

The aim of this research is to study Supercritical Fluid Extraction (SFE) process of dog rose seed. The process implemented at 30 MPa, 50 0C, and flow rate of 0.228 L/min by applying supercritical carbon dioxide and at 40 0C separation temperatures. The experiments were carried out over the period of 120 minute. Content of residue in SFE oil determined. The GC analyses revealed the oil from dog rose seeds was rich of unsaturated fatty acids.

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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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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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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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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 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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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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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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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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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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Carbonate-Ammonium Nitrate And Rheological Properties Of Its Melts, N.Yo Juraev, Sh.S Namazov, A.A Mamataliev, A.R Seytnazarov Apr 2018

Carbonate-Ammonium Nitrate And Rheological Properties Of Its Melts, N.Yo Juraev, Sh.S Namazov, A.A Mamataliev, A.R Seytnazarov

Chemical Technology, Control and Management

The chemical composition, strength and dissolution rate of carbonate-ammonium nitrate granules, obtained based on melt of ammonium nitrate and limestone, were determined in the research. The rheological properties of the carbonate-ammonium nitrate melts at the ratios NH4NO3: CaCO3 = 100: (5-80) and at temperatures 160-185°C were studied. It was shown that density and viscosity of the melt significantly magnifying with increasing in it amounts of limestone. Melt viscosity is more responsive on temperature changes whereas density is changes slightly. The lowest density and viscosity has melt obtained from limestone of the Zhamansay deposit. Melts of carbonate-ammonium nitrate in a wide …

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