bluuebunny/crossref_metadata_2025_split huggingface dataset:
Using electrostatic energy analyzer of a plane of symmetry for recording field emission spectra from carbon nanotube array
Authors: Bondarenko V B , Davydov S N , Kniazkov A V , Filimonov A V 
Published: July 2019

AbstractIn this paper, the possibility is discussed of using electron emission spectroscopy to study low voltage field emission phenomenon. While using an electrostatic electron energy analyzer with the plane of symmetry, electron energy spectra were recorded with the energy resolution of ΔE ≈ 10-30 meV. The energy analysis has been done of the electrons emitted from the array of nanotubes produced by CVD method. The conclusion is that the low-voltage emission is local and that it is caused by very strong and inhomogeneous electron field produced by surface charged defects.
An investigation of the thermodynamic properties of molecular crystals by the differential scanning calorimetry
Authors: Borisov A K , Egorov V M , Marikhin V A 
Published: July 2019

Abstract
The thermodynamic properties of long-chain molecular crystals (LMC) have been investigated by using differential scanning calorimetry. The impact of the chain length and of the chain end group type on the thermodynamic characteristics of the first and second order phase transitions in LMC has been studied. A method of the analysis of the peak shape of the first order transitions based on the theory of diffused phase transitions has been developed. The method allows one to estimate the size of the new phase nuclei within the bulk of the former phase. To estimate a true peak shape of the first order phase transition, a method to separate the overlapped heat capacity peaks has been proposed for the first time. This new method takes into consideration the hysteresis effects.
A novel method of waste processing of polymetal raw materials to make useful nanoproducts
Authors: Natorkhin M I , Bobyl A V , Cheremisin A V , Sokolov M S 
Published: July 2019

Abstract
The article deals with the theoretical basis of polymetal waste processing in chloride solutions. A schematic diagram is proposed for the processing of polymetal raw materials in a closed cycle. According to this scheme, the possibility is shown of obtaining metal products with highly developed nanostructure.
Quantification of changes in cellular morphology during cell necrosis obtained from 3D refractive index distributions
Authors: Gorbenko D A , Belashov A V , Belyaeva T N , Kornilova E S , Semenova I V , Vasyutinskii O S 
Published: July 2019

Abstract
In this paper we perform an analysis of changes in cellular morphology in response to photodynamic treatment in vitro. Experiments were performed by means of digital holographic tomography. 3D spatial distributions of refractive index in cells were obtained and main morphological parameters of cells were determined: volume, average height, membrane area. The cellular response to treatment at different doses was studied and changes in morphology were correlated with major cell death pathways, apoptosis and necrosis. The necrosis pathway was studied in dynamics. The data obtained by holographic tomography were validated using a standard test for the integrity of cell membranes, conducted using a confocal fluorescent microscope.
Substituted (Nd,Pr)2Fe14B alloys: structural features and magnetic properties
Authors: Politova G A , Tereshina I S , Kaminskaya T P , Viryus A A , Paukov M A , Lukin A A , Andreev A V 
Published: July 2019

Abstract
In this work the magnetic properties of (Nd,Pr)2Fe14B alloys have been investigated in a wide range of temperatures (4.2 – 700 K) and magnetic fields (up to 14 T). The features of the structure were studied using two methods: SEM and AFM/MFM. Magnetic phase transition diagram was constructed. In the region of magnetic phase transitions (Curie and spin- reorientation transition temperatures) the value of the magnetocaloric effect was determined as an entropy change. The constancy of the magnetocaloric effect value for (Nd,Pr)2Fe14B alloys has been established.
Broadening of X-ray reflections and inhomogeneous strain distribution in PbZrO3/SrRuO3/SrTiO3 epitaxial heterostructures
Authors: Lityagin G A , Vakulenko A F , Gao R , Dasgupta A , Filimonov A V , Burkovsky R G 
Published: July 2019

Abstract
Antiferroelectric thin film heterostructures are important in energy storage technology and have prospective applications in domain wall nanoelectronics. The improvement of functional properties of this kind of material is directly connected with the effect of epitaxial strain. Thus, the investigations of strain distribution in the antiferroelectic films volume are on demand. In this work we have studied the distribution of orientational domain states and the condition of near-interface layer in a set of PbZrO3 films with different thickness grown on SrRuO3/SrTiO3 substrate. The analysis of X-ray diffraction curves shows that only the relatively narrow near-interface part of PbZrO3 film experiences significant strain along the normal to the surface, which decays very quickly on moving away from the interface. The out-of-plane strain profiles are strongly similar in films of different thickness above d=50 nm. The inhomogeneous out-of-plane strain is surprisingly of compressive character, which we attribute to the effects of hydrostatic-like compression associated with the presence of edge dislocations. In the films of higher thickness, we observe unusual broadening of the Bragg reflections, which is also tentatively associated with relaxation through the formation of dislocations.
Study of surface topography and emission properties of thin Mo and Zr films
Authors: Bizyaev I S , Gabdullin P G , Arkhipov A V , Babyuk V Ye 
Published: July 2019

Abstract
Thin films of Mo and Zr were deposited on Si wafers by the magnetron sputtering process with controlled parameters. Correlation between their field-emission properties and surface morphology was investigated. The study results were found to be in good agreement with previous data acquired for carbon nanocluster films, which witnesses that morphology can have greater effect on field emission capability of thin films than their chemical composition and work function.
Substrate modification influence on properties of nanocomposite based on TiO2 and gold nanoparticles
Authors: Mishin M V , Vorobyev A A , Kondrateva A S , Koroleva E Y , Karaseov P A , Bespalova P G , Shakhmin A L , Glukhovskoy A V , Wurz M C , Filimonov A V 
Published: July 2019

Abstract
In this work, we study photo-induced current transfer through nanocomposite structures consisting of the TiO2 coating activated with plasmonic gold nanoparticles on top of pillar-like structured SiO2. It is shown that the photo-response of the nanocomposite can be adjusted via tuning of the heterostructure topology. Processes at the interface between silicon and noble metal nanoparticle play an important role in charge carrier photo-generation. The high photo-activity in visible part of spectrum has been found in the composite, containing pillar-like silicon dioxide nanostructures [1]. The electron transport via the SiO2 layer from the potential well at the TiO2-SiO2 interface to the n-Si conduction band was explained by electron tunneling mechanism. We present the empirical qualitative model which explains experimental results and helps to separate the contributions of different transport mechanisms.
Label-free real time optical detection of binding of living cells and biopolymers
Authors: Morozova O V , Isaeva E I , Klinov D V 
Published: July 2019

Abstract
Biosensor based on long range surface waves on one-dimentional photonic crystal (PC) surface in microfluid channel was used to detect binding of cells, viruses, nanoparticles and proteins. Covalent attachment of biopolymers to polyaminated PC with glutaraldehyde cross-linking in microfluid channel results in functionally active proteins, living eukaryotic, bacterial cells and viruses. The evident advantages of the optical biosensor include native conformations of biopolymers, detection of reversible or permanent specific binding with ligands, broad detection scale from eukaryotic cells to low-molecular-weight ligands and observations in real time with possible calculations of affinity and kinetic constants. However, relatively low sensitivity limit near 0.1 μg/ml of proteins is significantly less those of ELISA and xMAP immunofluorescent analysis (approximately 1 pg/ml). Integral adlayer thickness does not reveal molecular events on each cell with possible variations. The label-free real-time optical detection allowed us to estimate cytotoxicity of currently used and novel drugs and to explore the antiviral properties of new compounds.
Terahertz spectrometer for express diagnosis of breast cancer
Authors: Taranets K B , Bagraev N T , Klyachkin L E , Malyarenko A M 
Published: July 2019

Abstract
We demonstrate a novel approach to the problem of express diagnostics based on THz spectral features of the breast cancer and THz emission and detection provided by the topological edge channels of silicon nanosandwichstructures.
Optical tomography of residual stresses in GRIN rod lenses with transverse and longitudinal translucence
Authors: Karov D , Puro A , Fadeev A , Kuzmina A 
Published: July 2019

Abstract
The residual stresses (RS) in gradient-index (GRIN) rod lens are formed due to the material characteristics gradient. RS can lead to the birefringence effect. If a GRIN lens is birefringent, its applications may be limited, because the anisotropy can cause the image quality degradation. According to this, the urgent task is to develop a non-destructive diagnostic method of RS in the gradient optical structures. This paper presents the relations of the generalized method of integral photoelasticity for reconstructions of RS (optical tomography of the stress field) for the case of the bending probing rays in GRIN optical rods with a radial distribution of the refractive index. The problem is solved with plane strain approximations. RS Distributions are given reconstructed from tomographic data obtained with transverse and longitudinal (coaxial) translucence of GRIN rod lens.
Analysis of intensity/time series obtained in homodyne evanescent wave DLS electrophoretic experiments
Authors: Savchenko E A , Skvortsov A N , Velichko E N , Madzhhinov A R , Nezhinskikh S S 
Published: July 2019

Abstract
The electrophoretic motion in monodisperse and polydisperse systems of silica microspheres was studied by evanescent wave dynamic light scattering technique with homodyne detection. Instead of the attempts to calculate average autocorrelation function, the intensity temporal profile was assessed by short-time Fourier transform was followed by multivariate curve resolution. The profile contained random alternate smooth regions and oscillating regions with definite frequencies. The effect was attributed to the few number of moving particles in the narrow zone, illuminated by evanescent wave. The changes in the short-time spectrum corresponded to entry or exit of individual particles. Feasibility to evaluate the mobility of individual particles in polydisperse systems is discussed.
Cooperative spontaneous decay of local excitation in a dense and disordered ensemble of point-like impurity atoms near a charged conductive surface
Authors: Kuraptsev A S 
Published: July 2019

Abstract
On the basis of the general quantum microscopic theory we study the process of spontaneous decay of an excited atom in a dense and disordered ensemble of point-like impurity atoms embedded into transparent dielectric and located near a charged perfectly conducting surface. We have analyzed the simultaneous influence of the modified spatial structure of field modes near the conductive surface and the electric field on the character of interatomic dipole-dipole interaction. This leads to the modification of the transition spectrum of an excited atom inside an ensemble and the spontaneous decay dynamics. We have shown that the electric field changes the cooperative Lamb shift, as well as the character of sub- and superradiant decay.
Modeling parameters of the flood control facilities adapted to climate change
Authors: Antonov V I , Badenko V L , Davydov R V , Maslikov V I , Molodtsov D V 
Published: July 2019

Abstract
The article analyzes the results of modeling the regulation of flood flow in a river basin by the flood control facility on a side tributary of the river under conditions of climatic changes. The use of geographic information system for assessing the impact of the flood control facilities on the environment when justifying their parameters is considered. The need to create anti-flood hydro systems on side tributaries exists because the water capacity of existing and projected hydro systems may not be enough to transform the flood in conditions of economic and climatic changes. The problem arises of determining the required water capacity of the flood control facility and its location considering environmental requirements.
A new approach to differential lung diagnosis with CT scans based on the Siamese neural network
Authors: Meldo A A , Utkin L V 
Published: July 2019

Abstract
A lot of computer-aided diagnosis systems for lung cancer detection have been developed in the last years, but most of them may be not effective when we deal with the differential diagnosis. Only a part of patients with lung cancer have a typical nodular cancer. Some patients have the extremely difficultly recognized lung cancer due to its atypical visualization. A new approach is proposed for differential lung diagnosis and for solving the problem of classifying all types of lung cancer. It is based on the following ideas. First, we apply the length chord and Hounsfield unit value histograms characterizing the inner structure of a tissue and its surrounding as a new feature representation of the tissue. Second, we collect a special dataset which contains a lot of atypical cases of cancer and non-cancer tissues. Third, we propose to use histograms as well as suspicious lung object images for training and using two Siamese neural networks which can be viewed as a key element of the proposed approach and allow us to implement some elements of explainable artificial intelligence systems.
Stress state analysis of a semi-infinite region with a hole by the combined method
Authors: Chernysheva N V , Melnikov B E 
Published: July 2019

Abstract
A computational algorithm based on the FEM and Somigliana’s integral formula for the boundary problem in 3D medium is considered. The algorithm is modified for the case of inhomogeneous medium. Some practical boundary problems of geological and mechanical earth models are solved by algorithms discussed.
A design of flash analog-to-digital converter in 180 nm CMOS process with high effective number of bits
Authors: Budanov D , Korotkov A 
Published: July 2019

Abstract
High speed flash analog-to-digital converters are used in modern high-performance telecommunication systems. Furthermore, high effective resolution of such converter should be provided. The paper presents a design of a flash analog-to-digital converter with high effective number of bits. As an example, the 8-bit flash ADC in 180 nm CMOS has been implemented. Simulation confirms efficiency of proposed design. The effective resolution of presented design achieves 6.9 bits.
A new algorithm for processing the absorption and scattering signals of laser radiation on a blood vessel and human tissues
Authors: Davydov R V , Antonov V I , Yushkova V V , Grebenikova N M , Dudkin V I 
Published: July 2019

Abstract
The article describes a new algorithm for processing the pulse wave, which is formed from the registered signals of absorption and scattering of laser radiation on a blood vessel or vein and human tissues. A new method of tuning the optical part of the pulse oximeter is proposed to increase the reliability of the rapid diagnosis results of the human condition. Experimental data on studies of the health status of various people are presented.
The signal processing algorithm of automotive FMCW radars with an extended range of speed estimation
Authors: Ivanov S I , Kuptsov V D , Fedotov A A 
Published: July 2019

Abstract
The paper considers the algorithm for estimating the speed and distance to the target as applied to the mm wave automotive radar with linear FMCW. To extend the range of target speed estimation, a signal in the form of a Chirp Sequence Waveform is used with a shift of the initial frequency in the adjacent chirps of the frame. A mathematical model of the received microwave signal is proposed, taking into account a wide range of velocity changes of the target, as well as the effect of additive white Gaussian noise on the radar receiver. It is shown that the signal-to-noise ratio of 10 dB is necessary for the algorithm to work, and that the unambiguity and consistency of the speed estimate is limited by the first two Nyquist zones for the Doppler frequency.
Analysis of the possibility of using the system for small satellite de-orbiting based on an aerodynamic stabilizer, taking into account the physical features of the Earth’s upper atmosphere
Authors: Tkachenko I S , Korovin M D , Krestina A V 
Published: July 2019

Abstract
The paper presents an analysis of performance of a satellite de-orbiting system that utilizes a deployable aerodynamic stabilizer for controling the angular motion of a spacecraft in order to ensure the correct orientation of the breaking impulse. The problem of determining the shape of the stabilizer, considering its performance requirements and technological constraints has been adressed. The effectiveness of proposed design of the stabilizer for the prototype spacecraft based on the “AIST” small satellite was evaluated using two methods – calculation of aerodynamic forces generated by the rarefied gas flow using the experimental coefficients of the form and stochastic modelling using software. According to the calculations, the proposed aerodynamic system would be capable of providing sufficient stabilizing influence to satisfy the required stabilization time and permissible angle of attack deviation constraints. The range of orbits, where the aerodynamic stabilizer would remain efficient, have been determined with regards to atmospheric properties and design constraints, imposed by mass and size limitations of the system and the de-orbiting time.
Start Control for the MMC-HVDC
Authors: Zhang Xiaoliang , Ning Lianhui , Yin Yanjiao , Zhao Boyang , Han Jingwen , Hu Fangkai 
Published: July 2019

Abstract
This paper designs the control strategies and start procedure of MMC-HVDC. The start procedure consists of three stages, uncontrollable charging stage, controllable charging stage and power-raising stage. The current circuit is analysed and the equivalent circuit is obtained in uncontrolled charging stage. The computational formula of current-limit resistor is obtained in the uncontrollable stage. Two different control strategies to further charge the capacitors to the rated voltage in controllable charging stage are designed. Strategy one makes use of DC voltage control and balancing strategy of capacitor voltage while Strategy two divides the capacitors of one arm into two groups. In power-raising stage, to avoid the impact of power step, slope control is used in power outer loop. Finally, a simulation model is established in the PSCAD/EMTDC. The simulation results show that the effectiveness and rationality of the designed start procedure and control strategies
Analysis and Protection of DC Short Circuit Fault in True Bipolar MMC-HVDC System
Authors: Liu N M , Ning L H , Wu D , Su Y , Teng H D , Gao L 
Published: July 2019

Abstract
With the introduction of modular multilevel converter (MMC), the development of high voltage direct current transmission (HVDC) technology has been promoted. As flexible DC transmission technology is gradually extended to overhead line transmission, DC fault clearing and fault protection issues have become particularly important. In this paper, the current characteristics of different stages of DC short-circuit faults are studied for the overhead line true bipolar MMC-HVDC system. The simulation model of the true bipolar system is built by PSCAD/EMTDC software. The simulation results verify the correctness of the analytical calculation. Finally, in order to suppress the sudden increase of bridge arm current during fault, a bridge arm protection method for DC short-circuit fault is proposed. The simulation results show that the protection method can effectively protect the sub-module device in case of fault, and can Shorten the fault recovery time, this protection method effectively protects the devices of the AC system and sub-modules.
Research on Key Technical Parameters of 1100kV Live Tank Circuit Breaker for UHVDC Converter Station
Authors: Du Ning , Xiang Zutao , Han Bin , Yang Yue , Xiang Changyuan 
Published: July 2019

Abstract
Many of UHVDC transmission projects planned and under construction are hierarchical connected to 500kV and 1000kV AC grid in China. Live tank circuit breakers are selected for switching 1000kV filters. During the development of 1100kV live tank circuit breakers, the closing inrush current and transient recovery voltage are key factors for structure of extinguishing chamber of circuit breakers. In this paper, the above factors are analyzed by simulation, and key technical parameters of 1100kV live tank circuit breakers for UHVDC converter station are proposed.
Research on Control Strategy of Grid-Connected Converter Based on Virtual Inertia
Authors: Ke Wang , Guangzhu Wang , Chengxi Li 
Published: July 2019

Abstract
As the DC microgrid has low inertia, this paper draws on the virtual synchronous machine technology to propose and control a new virtual inertial control strategy. This control strategy enables the grid-connected converter to have both AC inertia and DC inertia. By small signal decomposition, the transfer function block diagram of the system is established. The effects of different inertial parameters on the system’s AC inertia and DC inertia are studied. The dynamic characteristic analysis and simulation results show that the proposed virtual inertial control can effectively suppress the fluctuation of DC bus voltage and AC power and increase the AC and DC inertia of the converter.
An Inverter Parallel Control Strategy Research on Variable Virtual Impedance
Authors: Li Weibo , Xu Zhihao , Xu Cong , Li Wei , Li Qi 
Published: July 2019

Abstract
In order to solve the imbalance distribution of reactive power in the power system caused by different line impedance in parallel muti-inverter system, This paper analyses the deficiency of traditional droop control and the causes of reactive current circulation. Double closed loop control based on inverter voltage and current, it studies the influence of different system parameters on the equivalent impedance of the inverter, according to the study it introduce virtual impedance, the real-time reactive power is distributed to a given reactive power through the inverter’s control system, and then the inverter control system estimates the virtual impedance by deviating the reactive power from the given reactive power. Simulation results show that the method of adjust reactive power on line have certain effectiveness and feasibility.