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Article
MF-4SC Membranes Modified by Polyaniline for Potentiometric Determination of Saccharin and Sodium Ions in Aqueous Solutions
MF-4SC membranes have been modified by polyaniline (PANI) with the oxidative polymerization method. The influence of the method of obtaining hybrid membranes and the content of PANI in them on the value of IEC...
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Article
Optimal Frequency Control of Electric-Train Asynchronous Traction Motors
This paper shows that a significant reduction in energy losses in an asynchronous traction drive during transient acceleration and deceleration modes is possible. Based on assumptions corresponding to the idea...
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Article
Assessment of Electrical Safety Conditions in the Case of Using Overhead Catenary Supports as Natural Grounding Electrodes
This paper presents a low-maintenance system of grounding overhead catenary supports by using reinforced concrete supports and foundations as natural grounding electrodes. An algorithm is elaborated for choosi...
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Article
Multisensory Systems Based on Nafion Membranes Modified by PEDOT for the Determination of Sulfacetamide in Aqueous Solutions and Pharmaceuticals
Composite membrane materials based on Nafion-117 gradient modified by poly(3,4-ethylenedioxythiophene) (PEDOT) are prepared by in situ oxidative polymerization. 0.002 M and 0.01 M solutions of the monomer are ...
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Article
Modeling Onboard Energy Storage Systems for Hybrid Traction Drives
The development of hybrid technologies for traction rolling stock manufactured for mainline, urban, and industrial railroad transport is a trend capable of improving the energy efficiency of transportation muc...
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Article
Potentiometric Sensors Based on Nafion Membranes Modified by PEDOT for Determining Procaine, Lidocaine, and Bupivacaine in Aqueous Solutions and Pharmaceuticals
Hybrid materials based on perfluorinated sulfonic acid Nafion-type membranes and poly-3,4-ethylenedioxythiophene (PEDOT) with a gradient distribution of the latter along the film length were synthesized by in ...
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Article
Using Bidirectional Converters in a Traction Drive
Modern means of power electronics are promoting a transition from standard locomotives with diesel motors and electric locomotives to traction drives with asynchronous motors and permanent magnet motors, as we...
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Article
An Automatic Electromechanical Drive for Carriage Doors
This paper considers the application of a carriage door electric drive based on sealed electromechanical ac converters with a linearly moving actuator of the traction gear for protection against unauthorized a...
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Article
Hybrid Materials Based on MF-4SC Membranes and Carbon Nanotubes: Transport Properties and Characteristics of DP-sensors in Hydrophobic Amino Acid Solutions
Perfluorinated sulfonated cation-exchange membranes MF-4SC containing 0.5–3.0% of carbon nanotubes (CNTs) have been synthesized. A correlation between the water uptake and transport properties of the membranes...
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Article
The Use of Energy Storages to Increase the Energy Effectiveness of Traction Rolling Stock
The important problem of increasing the energy effectiveness of traction rolling stock of railways and urban electric transport can be solved using onboard energy storages in traction electric drive systems. O...
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Article
Potentiometric Cross-Sensitive Sensors Based on Perfluorinated Membranes Treated at Different Relative Humidity for Codetermination of Cations and Anions in Alkaline Solutions of Amino Acids
The results of studying characteristics of potentiometric DP-sensors (sensors with the Donnan potential as their analytical signal) are presented for alkaline solutions of a sulfur-containing amino acid with p...
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Article
Improving the energy performance of alternating-current electric vehicles
Russian Railways has taken an active position on the implementation of programs aimed at energy saving. The strategic priority of these programs is the development and introduction of new types of energy-effic...
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Article
DP-sensors based on MF-4SC membrane and silica with hydrophobic surface for determination of phenylalanine, valine, and methionine cations
The influence of modification of MF-4SC membranes with silica (or surface-hydrophobized silica) nanoparticles on their ionic conductivity and diffusion permeability as well as the response stability and sensit...
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Article
On the construction of power quality control systems
Some aspects of the construction of power quality control systems in power supply systems are discussed. The basic requirements for quality factors of electric power are determined, the conditions of joint par...
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Article
Determination of glycine, alanine, and leucine at different solution ph with the aid of donnan potential sensors based on hybrid membranes
The cross sensitive sensors whose analytical signal is the Donnan potential (PD-sensors) were developed for the determination of the amino acids glycine, alanine, and leucine in acidic and alkaline solutions. ...
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Article
Potentiometric determination of glycine, alanine, and leucine anions and potassium cations in alkaline solutions using zirconia-modified nafion and MF-4SC membranes
Cross sensitivity of potentiometric PD-sensors (sensors whose signal is Donnan potential) based on MF-4SC and Nafion cation-exchange membranes containing hydrated ZrO2 nanoparticles to amino acid (glycine, alanin...
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Article
Specific features of resonant nonlinear absorption in colloidal solutions of CdSe/ZnS quantum dots
Nonlinear refraction coefficients and nonlinear absorption coefficients of colloidal solutions of CdSe/ZnS quantum dots (QDs) have been measured by the z-scan method. Resonant excitation was carried out by a Nd:Y...
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Article
Polymers as additives for improvement of the quality of paving asphalts
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Article
Production of binder for paving mix by oxidation of acid-pond tar and asphalts from deasphalting operations
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Article
Composition of acid tars from sulfuric acid treatment of petroleum oils
