bluuebunny/crossref_metadata_2025_split huggingface dataset:
Giant bipolar unidirectional photomagnetoresistance
Authors: Jiang Yucheng , He Anpeng , Luo Kai , Zhang Jinlei , Liu Guozhen , Zhao Run , Zhang Qing , Wang Zhuo , Zhao Chen , Wang Lin , Qi Yaping , Gao Ju , Loh Kian Ping , Wee Andrew T. S. , Qiu Cheng-Wei 
Published: June 2022

Positive magnetoresistance (PMR) and negative magnetoresistance (NMR) describe two opposite responses of resistance induced by a magnetic field. Materials with giant PMR are usually distinct from those with giant NMR due to different physical natures. Here, we report the unusual photomagnetoresistance in the van der Waals heterojunctions of WSe
2
/quasi-two-dimensional electron gas, showing the coexistence of giant PMR and giant NMR. The PMR and NMR reach 1,007.5% at
–
9 T and
–
93.5% at 2.2 T in a single device, respectively. The magnetoresistance spans over two orders of magnitude on inversion of field direction, implying a giant unidirectional magnetoresistance (UMR). By adjusting the thickness of the WSe
2
layer, we achieve the maxima of PMR and NMR, which are 4,900,000% and
–
99.8%, respectively. The unique magnetooptical transport shows the unity of giant UMR, PMR, and NMR, referred to as giant bipolar unidirectional photomagnetoresistance. These features originate from strong out-of-plane spin splitting, magnetic field–enhanced recombination of photocarriers, and the Zeeman effect through our experimental and theoretical investigations. This work offers directions for high-performance light-tunable spintronic devices.NMR)
Archives numériques et mémoire culturelle aux Caraïbes
Authors: Brander Miriam Lay 
Published: June 2022

AbstractThe question of cultural memory is particularly complex in the case of the Caribbean due to its fragmented history, which has led to great cultural diversity. Created within and outside the Caribbean during the last twenty years, structured online archives have taken up the issue of dispersed memories by taking an inventory of a multiplicity of objects which testify to the diverse past of Caribbean societies. Taking Glissant’s concept of Relation as a starting point, I analyze in this article to what extent these archives contribute to the constitution of a cultural memory in terms of contents, structure as well as possibilities of participation, considering the complexity of historical and social threads woven together within and between the Caribbean territories. To address this question, I will draw on two online archives specializing in the Caribbean:The Caribbean Memory Projectand the digital libraryMANIOC.
Personnages écologiques en résistance dans Guérilla de Véronique Bergen
Authors: Ninanne Dominique 
Published: June 2022

Abstract

Guérilla (2019), a multi-voiced novel by the French-language Belgian writer, Véronique Bergen,
raises the question of the current environmental crisis. I shall look at the main characters’ ecological personality: four eco
guerrilleros, a woman, a child and Gaia. Within the theoretical framework developed by Stéphanie Posthumus, which she based on
Félix Guattari’s Ecosophy and three Ecologies (mental, social and environmental), I shall examine the characters’ subjectivity.
Furthermore, I shall resort to the concept of resistance to which Véronique Bergen has dedicated her essay Résistances
philosophiques (2009). I shall highlight the resistant stances adopted by
the characters in their experimentation of subjectivity: the guerilla and the use of violence, the misuse of language, the
building of new alliances with all life forms and the cosmos.
Enhancing the adjustable range of saturation in color reflectors using a phase-change material as an effective absorption base
Authors: Chen Qing Yuan , Liu Fu Rong , Zhang Yong Zhi , Zhang Lu Lu , Lian Yang Bo , Yin Bo Shuo , Ma Quan Long , Rao Kai 
Published: June 2022

Abstract
Structural color technology has garnered extensive attention in the development of ink-free color technology for applications such as color displays, color reflectors, and colorimetric devices. A Fabry–Perot (F–P) structure formed by stacking a metal base, an interference cavity, and a phase change material layer (MIP) is of significant interest as a lithography-free and scalable color-reflecting structure. Such a structure can selectively reflect interfered light over a range of visible wavelengths, resulting in bright colors. However, obtaining a wide range of saturation regulation spaces has become a challenge. In this study, an F–P color reflector based on a phase-change material (PCM) base is proposed, which consists of a PCM base, an interference layer, and a PCM top layer (PIP). The results of the finite element simulation and experimental measurements demonstrated that the PIP reflector had an adjustable saturation range 10.75 times larger than that of the MIP reflector. The effects of the structure size and phase change of the PCM layer on the structural characteristics were further analyzed. In addition, the performance of laser-induced color change and its application in color printing were demonstrated. The present study sheds new light on color reflectors, and the strategy proposed indicates their potential optoelectronic applications based on saturation modulation.
Temporal evolution of scalar modes in Richtmyer–Meshkov instability of inclined interface using high-speed PIV and PLIF measurements at 60 kHz
Authors: Pathikonda Gokul , Petter Samuel J , Wall Isaiah E , Ranjan Devesh 
Published: June 2022

Abstract
The current work presents simultaneous, high-speed measurements at 60,000 fields per second of velocity and mole fraction using particle image velocimetry (PIV) and planar laser induced acetone-fluorescence in a Richtmyer–Meshkov instability of an inclined interface (Atwood number, At = 0.22). Specifically, around 2 ms of temporal evolution of the vortex structures and their associated scalar modes immediately following the interface-reshock interaction is presented. Two initial interface conditions are discussed—(a) a sharp, inclined ‘single mode’ interface and (b) a ‘multi-mode’ interface where small perturbations are imposed on the single mode case. A 2D wavelet decomposition of the scalar flow field shows a highly intermittent distribution of small-scale variance throughout the interface even at late times. These are correlated strongly with the vortex structures and local turbulence intensity, where each small-scale scalar mode is sandwiched between two co-rotating vortex structures. This indicates that the interstitial regions between the vortices are significant hotspots of entrainment, which is then dispersed by the induced, counter-flow velocity fields. The multimode case demonstrates similar organization at large scales, while the scalar field is much more homogeneous at smaller scales. These observations highlight the importance of capturing the early time vortex evolution to accurately estimate any late time intermittency, especially where deposition of intense vorticity on sharp interfaces is present.
Dynamics of the ground hydraulic hammer-pulsator
Authors: Zaripova Liliya M , Gabdrakhimov Mavlitzyan S , Gabdrakhimov Fanil S 
Published: June 2022

Abstract
Various vibration mechanisms are used as vibration exciters for the beneficial use of vibration. By the type of drive, vibration mechanisms are divided into mechanical, electromechanical, hydraulic, pneumatic, vacuum-compression, electromagnetic and magnetostrictive. They are designed to excite forced vibrations that provide the required technological effect. Vibrators and vibrating hammers are currently used for vibration drilling of shallow wells in soft rocks, for vibration-rotating drilling in rocky and semi-rock formations, for driving and removing casing pipes and eliminating accidents associated with stuck drilling at the bottom of the well. The structural scheme of the ground hydraulic hammer-pulsator is designed for drilling seismic wells, the striker of which is a two-stage piston. The piston is connected to the atmosphere; the large piston is for studying the influence of the hydraulic hammer-pulsator on the drilling efficiency is equipped with a valve that closes the channels of the large piston in the upper position, and opens - in the lower position. A schematic diagram of a surface hydraulic hammer is shown to study the effect of a hydraulic hammer-pulsator on the drilling efficiency.
Analysis of the design of ultrasonic electronic generators
Authors: Sultanova Sh A , Safarov J E , Usenov A B , Muminova D 
Published: June 2022

Abstract
The design and operation of electronic generators for ultrasonic intensification of processes in gaseous and liquid media will be considered. General requirements and new approaches to electronic generators have been developed based on the analysis of the characteristics of modern piezoelectric vibration systems that perform large amplitude oscillations (quality factor, multi-frequency, multilayer piezoelectric elements). Continuous monitoring of system parameters and setting of optimal operating modes of the electronic generator were studied.
Dynamic model of a robotic platform with 6 degrees of freedom
Authors: Khurtasenko A V , Chuev K V , Rybak L A 
Published: June 2022

Abstract
The paper presents the study of kinematic and dynamic characteristics of the robotic mobility platform (RMP) to determine inertia-force parameters depending on the nature of the implemented motion path. The method is implemented on the basis of parameterized digital simulation models with parallel kinematics, which allow determining acceleration and force response in the joints of structural components at given geometric parameters of the platform design.
Integrated system for conducting a full-scale experiment in a workshop on robotics and electronics
Authors: Kuznezova A V , Kurileva N L , Korchagin S A , Khasanshin I Ya , Semenov D N , Kruglov V I 
Published: June 2022

Abstract
An integrated information and measurement system is presented, including a personal computer, special software, a set of sensors, and an ADC-DAC. Some possibilities of using modern information technologies in the workshop on robotics and electronics are shown. Several experiments were carried out using a traditional installation and a modified one using modern information technologies
Analysis of possibility to improve the civil marine radar efficiency during navigation in the Arctic waters
Authors: Suslov A N 
Published: June 2022

Abstract
The paper presents the civil marine radar (CMR) efficiency in the polar waters in the case of advanced signal processing based on the optimal filtering of the voltage coming to the intermediate frequency amplifier. The structure of the radar subsystem was modified by adding two complementary filter units that allow to transform the filter frequency response into the almost sinc-function curve providing much better detection of weak radar echoes. The studies have shown that the updated radar matched filter makes it possible for CMR to observe objects with relatively small scattering cross section at the considerably longer distances than up-to-date CMR. Also it is explained that this radar signal processing doesn’t require the increasing of CMR cost which can also be considered as advantage of the method.
Calculated estimation of influence of convection rate of molten working and heating medium during hardening of restored parts
Authors: Buylov V N , Rudik F Ya , Lyulakov I V , Danilin A V , Pavlov A V 
Published: June 2022

Abstract
The paper presents a computational and mathematical assessment of the convection rate of the molten working and heating medium during the strengthening of the restored parts. The calculated estimate is based on the theory of multidimensional heat and mass transfer processes occurring in the electrode furnace during the strengthening of the restored parts. Computational modeling is carried out based on the choice of initial data and characteristics. The calculation results made it possible to establish the effect of the convection rate of the molten working and heating medium on the hardening of the restored parts. The theoretical description of the conditions for the onset of convective motion of a molten continuous medium is based on the Rayleigh–Bénard, Navier–Stokes, and Lorenz equations for the flow of a viscous continuous medium using the Oberbeck-Boussinesq approximation. The description of the internal space of the tank furnace is carried out by a system of differential equations of the balances of elementary volumes into which it is divided. Transformations into a system of differential equations are carried out on the basis of the Galerkin method. The use of this transition method leads to the fact that the sought functions are represented in a variable-separated form that exactly satisfies the boundary conditions. The introduction of assumptions and boundary conditions made it possible to obtain the equations of motion of mass forces and a viscous medium in a polar coordinate system. A formula describing the configuration of the temperature field is obtained.
Calculated substantiation of isolation of boron and sodium cations from molten working and heating medium during hardening of restored parts
Authors: Buylov V N , Rudik F Ya , Lyulakov I V , Makarov S A , Pavlov A V 
Published: June 2022

Abstract
Scientific and technological research in the development of the technical process for the restoration and strengthening of worn parts using calculated justification allowed us to make an optimal technical decision on the development of a method for surfacing and electrolysis borating of parts to increase their service life. The working medium for strengthening the restored tillage organs of agricultural aggregates is substantiated theoretically using the developed mathematical model describing the working medium as a thermodynamic system consisting of boron cations, sodium and oxygen anions. The creation of a potential difference in this medium will provide a process in which boron and sodium ions are discharged at the cathode, and oxygen ions at the anode. For this, it is necessary to theoretically determine the electromotive forces of polarization of electrolytic cells and compare them. The solution to this problem requires an assessment of the change in the Gibbs energy during the decomposition of sodium oxide and boric anhydride for the temperature of the borating process, taking into account its change under standard conditions, the chemical potentials of the reacting components and phase transitions, the melting of substances and their sublimation. The order in which boron and sodium are separated at the cathode is determined by comparing the electromotive forces of polarization of boric anhydride and sodium oxide. It was found that sodium oxide is more stable than boric anhydride. Consequently, boron atoms are reduced on the cathode surface, and calculations have confirmed the possibility of its use.
Study of classification processes of various bulk geomaterials in a hydrodynamic environment using laboratory models of counter-current drum separators
Authors: Lebedev I F 
Published: June 2022

Abstract
The paper presents the results of studying separation processes of various mineral particles of different density in a hydrodynamic (water) environment in three laboratory models of counter-current drum separators with cylindrical, conical and multifaceted drums. Research results have shown that compared to cylindrical and conical drum separators, the multifaceted separator is most effective in separating and refining in a hydrodynamic environment. The high recovery of heavy minerals in the concentrate proves this fact.
Diagnostics and reliability of lithium-ion batteries
Authors: Mizaev M M , Malozyomov B V , Radchenko V O 
Published: June 2022

Abstract
Lithium-ion storage batteries are the most promising direction in the field of energy storage. This article provides an overview of this type of battery. A comparison of the main types of batteries is also provided. The issue of the durability and reliability of batteries is touched upon
Improving the efficiency of reactive power compensation devices through neural analysis
Authors: Zatsepina V I , Shachnev O Ya , Abdulkadyrov U U 
Published: June 2022

Abstract
This article reflects the effectiveness of the use of neural analysis in control systems of powerful devices. The features of neural network modeling in the Matlab Simulink Neural Network Toolbox software package are presented. The state of the neural network in the field of error construction in event of a change in the operating mode of an electrical installation is clearly reflected. The application of the “Adaptive Linear Prediction” function in control systems of reactive power compensation devices is proposed. The positive aspects of the application are indicated, which in combination give a positive economic effect in the field of energy efficiency industrial enterprise.
An approach to arranging primary and secondary control of the operating parameters in microgrids featuring inverter-connected generator sets
Authors: Ilyushin P V , Suslov K V , Kulikov A L 
Published: June 2022

Abstract
Various low-power generator sets (GS) are mainly integrated into microgrids by means of inverters coupled with energy storage systems (ESS). ESSs are connected either to the DC busbars of GSs or to the AC busbars of the microgrid, in this case they are equipped with individual inverters. Use of ESS helps balance power in cases of load surge / loadshedding when the microgrid is islanded. This paper overviews approaches to arranging primary and secondary control of the operating parameters of microgrids. It discusses the technical challenges of, and possible solutions for, implementing primary and secondary control in low- and medium-voltage distribution grids featuring inverter-connected GSs. Calculations of electromechanical transients show that inverter-connected GSs have advantages over conventional GSs when used microgrids that are weakly connected to the power system (the external grid) or islanded. In a microgrid featuring inverter-connected GSs, active and reactive power need to be controlled separately as in power systems featuring conventional GSs; implementation of such controls must be adjusted for the parametric and topological characteristics of low- and medium-voltage distribution grids. To address the issues of linked control, this paper proposes a comprehensive approach that adjusts microgrid design for the specifics of inverter-connected GSs, improves inductance, and incorporates algorithmic solutions. It details upon the virtual impedance algorithm, which extends the common principle of droop speed control. Its implementation helps load the GSs and the ESS with adjustments for their installed capacity; it can also simulate the mechanical constant of GS inertia. Primary control has a low margin that mainly comes from the ESS; thus, backups available to secondary control must be used to compensate for the deviations in operating parameters; this is a key challenge of secondary frequency and voltage control in microgrids. When primary and secondary voltage and frequency controls have been duly implemented in a microgrid, its GSs, the ESS, and electricity delivery to the loads within the microgrid can all operate reliably in a variety of operating situations.
The task of assessing the risk in the operation of a complex free formal system
Authors: Abdullaev Z , Ziyadullaev D Sh , Muhamediyeva D T 
Published: June 2022

Abstract
The article discusses the use of a vaguely defined knowledge base and neural networks for risk assessment when using complex poorly formalized systems. An example of the risk assessment task is the operation of a storage facility for the transport or storage of industrial products. Consideration of a fire with different parameters is required as an anomalous external influence. The storage response, measured by the assessment of the safety of the content and its non-penetration into the external environment, can vary depending on the current state of the system, for example, the degree of possible damage in emergency conditions.
Research of temperature zones during primary processing of silkworm cocoons using a modern thermal imaging camera
Authors: Safarov J E , Sultanova Sh A , Samandarov D I , Zulpanov Sh U , Rakhimov A 
Published: June 2022

Abstract
The article presents the results of studies conducted at the Tashkent State Technical University (based on the research project № F-A-2018-029) to determine the temperature zones in the vibrating infrared dryer using thermal imaging during the primary processing of silkworm cocoons. To ensure a uniform temperature and maintain the quality of the final product, one of the important tasks is to determine the temperature zones at different points of the device and eliminate heat loss in it. On the basis of the obtained results of the study with the help of a thermal imaging device, the drawbacks of the infrared vibrating drying unit associated with the emitters and the flow of heat flow in the primary processing of cocoons were eliminated, and the optimum temperatures were determined and uniform processing of mulberry silkworm cocoons was ensured.
Field oil viscometer and methods for calculating viscosity of water-cut fluids
Authors: Valeev M D , Mingulov I Sh , Mingulov Sh G , Mukhametshin V V , Kuleshova L S , Zinnatullin R R 
Published: June 2022

Abstract
A field oil viscometer is developed and certified for measuring the viscosity of water-cut oil sampled from a well manifold line or a field pipeline. A method is proposed for calculating oil viscosity differing in standard water-cut based on a single well measurement, regardless of the water-cut of a fluid and its temperature. The viscosity of standard water-cut oil is measured when a sampled dry crude oil is degassed to atmospheric value.
Evaluation of enhanced oil recovery efficiency at fields with hard-to-recover reserves
Authors: Khusnutdinova R R , Yusupova L F , Petrova L V 
Published: June 2022

Abstract
The paper discusses measures of enhanced oil recovery of highly watered reservoirs using water-soluble polymer-based systems at Priobskoye oilfield. The application is based on enhanced oil recovery of reservoirs due to decrease of permeability of water channels due to internal formation of insoluble sediments when mixing the solution of alkali with highly mineralized reservoir waters. The study revealed reserves for oil production due to the injection of polymer-alkaline solution.
Research and improvement of statistical prediction methods of efficiency of hydrochloric acid treatments
Authors: Shakurova Al F , Shakurova Ay F 
Published: June 2022

Abstract
The paper studies the apparatus of mathematical statistics for predicting the technological efficiency of hydrochloric acid treatments. The apparatus of mathematical statistics is quite widely used to process the results of measurements of field data, for example, during the assessment of the effectiveness of various methods of oil recovery increase.
As a result, we developed a method to predict the efficiency of the HAT for injection wells using power-law regression equations. With an accuracy satisfactory for field purposes (even in the presence of a sparsely representative sample of actual data), which ensures the prediction of the technological efficiency of production wells in terms of the amount of additional oil production and the value of its duration after the HAT on the adjacent injection wells, it was proposed to use regression equations of the second degree.