bluuebunny/crossref_metadata_2025_split huggingface dataset:
Computer simulation of the fiber optic electric field sensor
Authors: Temkina V , Medvedev A , Mayzel A 
Published: July 2019

Abstract
The article describes an approach for simulating the fiber optic electric field sensor with a sensitive element operating on the Pockels effect arising in an optical waveguide recorded in a lithium niobate crystal. The sensor simulating was implemented in the NI LabVIEW programming environment and built using a mathematical apparatus based on the formalism of Jones matrices, which allowed to describe the polarization state of the light beam at the output of the sensor and to calculate the intensity of the interference signal at the photodetector input. Besides, additional modulation with a sawtooth signal and digital phase detection were used in the simulation. The sensor model described in the article can be easily modified and complicated, which makes it possible to use it for research and analysis of both parasitic effects and different optical sensor configurations.
Device for wideband ratio pyrometry
Authors: Kneschaurek E V , Pavlov A V , Rjabow R W , Ustinov A B 
Published: July 2019

Abstract
In this article we present procedures of creation, verification, and application of a device for contactless measurement of object’s temperature in vacuum. In contrast to conventional dual-wavelength pyrometers, it does not rely on spectral filtering and makes use of the intrinsic bandwidth parameters of photodetectors. In theory the device is capable of measuring values of temperature ranging from room temperature to several thousands kelvins. The verification was performed using a reference thermometer. Also, in-field measurements of the sample’s temperature in vacuum were conducted, which show efficiency of the proposed system.
Infrared versus white light sources for polarimetric imaging setup
Authors: Putintseva M V , Nepomnyashchaya E K 
Published: July 2019

Abstract
The results of the experimental investigation of polarized backscattered light from a biological tissue using cross-polarization imaging technique are presented. A new approach for detecting different morphological abnormalities of the cutaneous structure caused by various diseases and aberrations (pathologies) irradiating the exact sector of the object under study with incoherent infrared light is proposed. The obtained results are compared with results of our previous experiments of illuminating the skin sector with incoherent white light source. Such proposed technique provides the possibility to get the comprehensive information on the structure of the object containing scar structures and other abnormalities and skin illnesses. This method can be used to develop medical devices that are applicable for diagnosing diseases, which are hardly distinguishable at early stages and for monitoring the patient’s condition.
On approximation and experimental accuracy in dynamic light scattering
Authors: Nepomnyashchaya E K 
Published: July 2019

Abstract
The work is dedicated to estimation of accuracy of calculations in dynamic light scattering experiments, in particular approximation and size determination of nanoparticles in polydisperse solutions. In dynamic light scattering the proper approximation is crucial to final accuracy of sizes calculations, especially if we consider polydisperse solutions, such as biological fluids. Calculated and experimental errors have been compared.
Frictional self-oscillations of the one - two degree of freedom systems
Authors: Chernysheva N V , Platovskikh M J , Vetyukov M M 
Published: July 2019

Abstract
The problem of frictional self-oscillations (FSO) appears for devices and mechanisms, friction units of which operate in conditions of the friction process instability at rather small speeds of slippage. Such oscillations arise at operation of arresting arrangement, friction engagement mechanisms, drilling machines, etc. In the paper, FSO have been analyzed in terms of existence and attraction areas of different conditions on parameter plane both for one- and two-mass models.
Construction of adequate mathematical model of physical object from merit function
Authors: Amosov V V , Petrov A V , Tyshkevich A I 
Published: July 2019

Abstract
Methodology for construction of adequate mathematical model of the object from merit function is proposed. Characteristics which determine degree of acceptability of the model are introduced: acceptable disagreement between modelling results and experimental data, required number of states of the object of study, significance thresholds of independent variables. Software package for construction of adequate mathematical model has been designed which allows us to automate the construction process. Proposed methodology and software package allow for transition to mathematical model with given in advance disagreement between modelling result and experimental data. The degree of acceptability of already existent mathematical models can also be improved.
Finite-element modeling of ferroelectric material behavior at morphotropic phase boundaries between tetragonal, rhombohedric and orthorhombic phases
Authors: Lobanov S M , Semenov A S 
Published: July 2019

Abstract
The nonlinear response of ferroelectric/ferroelastic material below the Curie temperature is analyzed at morphotropic phase boundaries with account of tetragonal, rhombohedric and orthorombic phases. The results are obtained by means of finite-element homogenization with using the micromechanical model taking into account the dissipative nature of the domain wall motion. The results of simulation have revealed the extremal values of spontaneous polarization and remanent strain at morphotropic phase boundaries for the tetragonal/rhombohedral and tetragonal/orthorhombic compositions.
Compact microwave frequency standard on Hg-199 ions for navigation systems
Authors: Lukashev N A , Moroz A V , Davydov V V 
Published: July 2019

Abstract
The design of a magnetic trap for low mass-dimensional microwave frequency standards is presented. The dependencies of the number of photons registered by PMT on magnetic field values are established. The new algorithm for optical processing has been developed. The comparison of experimental Allan deviation for different designs of microwave frequency standards on 199Hg+ ions has been performed.
Role of different scattering orders in the formation of intensity of light scattered by a cold atomic ensemble placed into static electric or magnetic field
Authors: Larionov N V 
Published: July 2019

Abstract
The scattering of light by an optically dense cold atomic ensemble placed into the static electric or magnetic field is studied theoretically. The total intensity of light scattered into the given direction is considered. Analysis of the angular distributions of intensity of light for different scattering orders allows one to understand the formation of the total intensity.
Comparison of orientational error of an optically pumped quantum sensor in on-board equipment of Galileo and GPS satellite systems
Authors: Lozov R K , Baranov A A , Ermak S V , Semenov V V 
Published: July 2019

Abstract
A comparison of the hypothetical orientational shift of the rubidium frequency standards on gas cell used in the on-board equipment of the Galileo and GPS satellites navigation systems is presented. The calculated dependences of the orientational error of the rubidium atomic clock as a function of the time of movement of the Galileo and GPS satellites in orbit are given. The calculated values of the correlation coefficients of the dependences of the orientational shift of the atomic clocks and the experimental data of the temporal dependence of the orientational error of the satellites are presented. There is a significant excess of the correlation coefficients in the GPS satellite system in comparison with the Galileo system. This may be due to the difference in the contribution of the orientational error of atomic clocks to the total error of the satellite ephemeris.
Analytical model of the single emitter laser with modulated coupling constant
Authors: Khachatrian R , Popov E 
Published: July 2019

Abstract
Using the master equation for the density operator of the laser field, we constructed an analytic model of a single emitter laser under a strong atom-field coupling in the non-stationary regime, that is obtained by coupling constant modulation at the defined frequency. The model demonstrated the emergence of a harmonic force, that partially compensates for relaxation processes in the quantum system. The mechanism of force occurrence, is described by changing the coupling constant.
A highly linear 25 MHz bandwidth Gm-C SOI complex filter
Authors: Ivanov N V , Korotkov A S 
Published: July 2019

Abstract
In this paper, a highly linear complex filter in SOI X-FAB 180 nm technology is proposed for 25 MHz bandwidth with 25 MHz center frequency. Third harmonic compensation technique is used for transconductance amplifier design. Reactance transform is used for the filter synthesis. Layout design is discussed. Simulations show THD better than -75 dB @ 25 MHz 1 Vpp for temperature range of -40 to +200 °C.
Wireless local data transmission network through LED lighting compatible with IEEE 802.11 protocol communication systems
Authors: Kozyreva O A , Polukhin I S , Shiryaev D S , Shcheglov S A , Borodkin A I , Gareev E Z , Kondakov D V , Matveev Y A , Odnoblyudov M A , Bougrov V E 
Published: July 2019

Abstract
We developed a wireless duplex communication system using visible light communication concept. In this work we investigated a downlink data transmission channel. We modelled the optical configuration of the system, calculated optical losses, fabricated the system and measured downlink channel parameters under test of analog and digital signals. The analysis showed that with a heterodyne scheme used for transmitting signals through visible light, the model of additive Gaussian noise is applicable to the channel and there are no phase distortions in the system. The system has shown the capability to operate with modulation types according 802.11 IEEE protocol.
Research on Switching Overvoltage of MMC-MTDC System with Hybrid DC Circuit Breaker
Authors: Chen R Q , Ning L H , Ma Z X , Yin Y J , Zhao Q X 
Published: July 2019

Abstract
The modular multilevel converter based multi-terminal HVDC (MMC-MTDC) system with hybrid DC breakers should consider the influence of the action of the DC breaker on the switching overvoltage, which puts higher requirements on the overvoltage protection of the system. Flexible DC demonstration project in Zhangbei will realize the first engineering application of hybrid DC circuit breaker. Based on this project, an overvoltage protection scheme for MMC-MTDC system is proposed. Firstly, this paper investigates the effect of the operation mode of the DC grid on the switching overvoltage level. Secondly, typical faults and the protection action sequence of various faults are analyzed in detail. The characteristics and laws of various switching overvoltage are deeply studied. Finally, the switching overvoltage of converter station is calculated on the basis of the control and protection system, and the recommended values of the insulation level of converter station equipment for the ±500kV MMC-MTDC system with hybrid DC circuit breaker are given.
Theoretical and Simulation Study on On-line Monitoring Technology of Transformer Short-Circuit Impedance
Authors: Liu Hao , Gan Zhaohui , Liu Xi , Yang Fanglin , Wang Chan , Wang Chengwu 
Published: July 2019

Abstract
Based on the equivalent circuit of transformer, this paper deduces the calculation method of short-circuit impedance of three-phase transformer based on multiple measurement data. Taking a single-phase transformer as the research object, the ‘magnetic field-circuit’ simulation model is established. The normal operation and winding deformation caused by different axial displacements are simulated and analyzed. The results show that short-circuit impedance changes when transformer winding is axially deformed, and the degree of change is related to the degree of deformation. Compared with the normal situation, the short-circuit impedance increases by 52.1% when the four transformer coils are moved 15 mm each. Therefore, on-line monitoring of the transformer short-circuit impedance can reflect the abnormal deformation of the transformer winding to a certain extent.
Research on Optimal Operation Mode for Large-scale Urban Distribution Network Considering Safety Constraints
Authors: Fan Yang , Lei Yang , Jun Liu , Ling Shi , Haifeng Tang 
Published: July 2019

Abstract
As an important measure for structure optimization, the network reconfiguration has been drawing attention of scholars at home and abroad. At present, the general goal for network reconfiguration is to reduce network line loss achieving load balance. In this paper, the reconstruction methods for distribution network considering closed loop constraints is proposed from the perspective of load transfer between different loops to improve closed system reliability. After Dongjing Town distribution network verification, this method has shown important theoretical significance and high practical value.
Conic Programming Based Day-ahead Optimization Dispatch in Distribution Network Containing Large-scaled Distributed Generation and Electric Vehicle
Authors: Gao Fei , Song Xiaohui , Shi Haifeng , Li Jianfang , Zhang Yu , Li Yajie , Zhao Shanshan 
Published: July 2019

Abstract
Regarding day-ahead optimization dispatch in distribution network containing large-scaled distributed generations (DGs) and electric vehicles (EVs), this paper proposes an optimization dispatch method based on conic programming. A model for dispatch that can optimize the EV aggregator charging power and the output of DGs is established. The proposed model takes the constrains of EV charging energy and charging power into consideration. In addition, DG can curtail the active power in the model to guarantee the operation safety. Then nonlinear optimization dispatch model are transformed and relaxed into second-order cone programming model to be solved. The optimization dispatch method proposed in this paper is verified by the IEEE33 node test system.
Site Selection and Capacity Determination of Multi-Types of DG in Distribution Network Planning
Authors: Wang Y N , Zheng T 
Published: July 2019

Abstract
Site Selection and Capacity Determination of Multi-Types of Distributed Generation (DG) have a significant impact on the distribution network planning. Therefore, it is necessary to scientifically analyze the impact of the distributed generators on the distribution network, Considering the minimum sum of investment cost, network loss cost and power outage loss cost, the grid planning model is established by considering network constraints such as voltage constraint, line capacity constraint, power flow constraint and reverse power flow constraint.. The genetic algorithm is used to solve the optimal grid planning scheme for the distribution network with microgrid. Finally, the IEEE 14-bus Distribution Network is analyzed for the DG location and volume planning in Distribution Network to verify the validity and feasibility of the planning model.
Research on Distributed Energy Storage Operation Mode and Technical Economy under the Background of Energy Internet
Authors: Shi Zhiyong , Li Qionghui , Huang Bibin , Hong Bowen 
Published: July 2019

Abstract
Energy storage subverts the traditional concept of source-network-load, breaks the inherent property of power supply and consumption at the same time. Distributed energy storage plays an important role in the energy internet. The paper introduces the technical characteristics of distributed energy storage, builds typical application scenes under the energy internet environment. Given this background, two typical operation modes of customer-side distributed energy storage are proposed based on different operational objectives and constraints. After studying the basic strategy of the operating model and evaluating the distributed energy storage economy from the perspective of users and electricity retailers, it can be concluded that distributed energy storage is able to effectively improve system flexibility and energy utilization. Its economy is determined by various factors such as technical route, configuration capacity, and electricity price. A reasonable operation mode can promote the sustainable development of distributed energy storage.
Research on the Static Test of Active Power Compensation Coefficient for Compressed Air Energy Storage
Authors: Wen Xian-kui , Zhong Jing-liang , Li Pan , Chen Wen 
Published: July 2019

Abstract
Peak load regulation and frequency regulation of electric power system are the main roles of Compressed Air Energy Storage(CAES). The static test method to active power compensation coefficient (APCC) has never been founded yet. Based on the operation character of CAES, the range of APCC has been given in this paper. This paper also introduced the static test system for APCC and the process of static test. In the end, the method of calculating for APCC has been established. With the static test, the APCC can be evaluated, which can make the grid more stable.
Valuation of Energy Storage at User Side Considering Total Life Cycle
Authors: Hu Jing , Hong Bowen , Ma Kai 
Published: July 2019

Abstract
With the continuous progress of energy storage technology and the substantial reduction of cost, as well as the development of China’s energy Internet, customer-side distributed energy storage has been applied more and more widely. Considering the customer-side distributed energy storage which takes the grid-connected “distributed solar + energy storage” as the main application mode, a distributed energy storage evaluation model based on double-granularity optimal operation strategy is proposed, which is built on life-cycle cost-benefit analysis model for customer-side distributed energy storage considering its operation optimization in advance. Taking large industrial and business consumers in one province in China as an example, the sensitivity analysis of customer-side distributed energy storage value is taken under different load characteristics, price policies, energy costs and energy storage technology characteristics, judging the customer-side distributed energy storage trends and potential of further development.
An Adaptive Reclosing Switch Based on Shunt Resistance
Authors: Liu Jian , Lei Yu , Zhang Zhihua 
Published: July 2019

Abstract
In order to solve problems that the low coincidence success rate of the automatic reclosure of distribution network and short-circuit current has a large impact on the system when it coincides with the permanent fault, a shunt resistance type of adaptive reclosing switch is proposed. In order to improve the success rate of reconfiguration of the distribution network. By selecting the appropriate shunt resistance, the switch can not only suppress the magnetizing inrush current, limit the short-circuit current, reduce the system impact, but also use the current characteristics flowing through the shunt resistance to determine whether there is a permanent fault in the downstream, and realize the adaptive reclosing. The shunt resistance type adaptive reclosing switch can be separately applied to the power distribution switch to replace the original reclosing mode, and as a switch with protection function, the safety of the fault handling process is improved.
Electromagnetic Transient Analysis of 500 kV XLPE Submarine Cable Interconnection Project from Zhenhai to Zhoushan
Authors: Xiao Shijie , Ding Xiaoyu , Wang Xiaotong , Ning Kanghong , Chen Hongwei , Peng Mingwei , Wang Xiaojian 
Published: July 2019

Abstract
In Zhenhai-Zhoushan transmission project, 500kV XLPE submarine cable lines are used for the first time in the world. Using electromagnetic transient simulation program(EMTP), electromagnetic transient problems in this project are investigated including electrical parameter of submarine cable lines, power frequency overvoltages, secondary-arc currents and recovery voltages during the single-phase reclosing, power frequency resonance overvoltages, induced voltages and induced currents, switching surges and so on. On the basis, the recommended configuration scheme of HV shunt reactors and neutral reactors is proposed. In addition, it is suggested to install closing resistors of 400ohm on both sides of line breakers in order to restrict switching overvoltages and ensure safe operation of submarine cable lines.
Mechanism and Experimental Study on Insulation Defect Discharge of Transmission Line
Authors: Liu Zhenyao , Gao Song , Jiang Haibo , Guo Rong , Kang Yubin , Chen Xuan 
Published: July 2019

Abstract
Common faults on transmission lines, such as insulator pollution flashover, trees flashover, string breakage failure of insulator will undergo a period of discharge before the occurrence of flashover, which is called insulation defect discharge. In this paper, the process of discharge such as floating discharge, insulator pollution discharge and tree discharge is simulated in the laboratory environment and the high frequency current waveform is monitored. The results show that insulation defect discharge will maintain a long period of time and will not immediately form a flashover fault, in addition, a great deal of high frequency discharge current pulses will be generated during this period. The discharge characteristics and the discharge pulses generated by different type of insulation defect discharge are quite different. Frequency of floating discharge current waveform are very high, while the pulse cluster of pollution discharge is dense, and the current waveform generated by tree discharge has notable dispersity. With the degree of discharge increasing, the parameters such as pulse repetition rate and discharge amount are gradually increasing.
The Strategy of Doubly-fed Induction Generator Low-voltage ride-through Based an Integrated Protection Circuit
Authors: Wang Xiangming , Zhang Huijuan , Zhang Qinrui 
Published: July 2019

Abstract
Aiming at the shortcomings of single-protection circuit in the low-voltage ride-through (LVRT) process of doubly-fed induction generators (DFIG), this paper proposes an integrated protection circuit strategy for LVRT of DFIG based super-capacitor(SC). The integrated protection circuit includes a Crowbar circuit, a rotor series dynamic resistance (SDR) and SC. By adopting different protection circuits in different situations and time divisions, the LVRT capability of the DFIG is comprehensively improved, and the transient current of the rotor current during the protection circuit input is analyzed in each case. Finally, the proposed integrated protection circuit strategy is compared with the traditional single Crowbar circuit and single SDR on the simulation platform MATLAB/Simulink. The simulation results demonstrate the effectiveness of the proposed integrated protection circuit strategy.