bluuebunny/crossref_metadata_2025_split huggingface dataset:
Criterion of drop fragmentation at a collision with a solid target (numerical simulation and experiment)
Authors: Fedyushkin A I , Rozhkov A N 
Published: November 2021

Abstract
This paper is devoted to the study of the deformation and fragmentation of liquid droplets when they collide with masks and filters used for protection against infected droplets. In this paper, the local collision of a drop with a mask or filter is modeled numerically and experimentally by the example of the drop impact on a small obstacle. Studies allow tracing the fragmentation of oral and bronchial fluids and their transformation into the number of tiny droplets that spread infection in the air.
A comparative analysis of schemes of indirect evaporation type apparatuses
Authors: Gorbachev M , Terekhov V 
Published: November 2021

Abstract
In this paper, a comparative analysis of schemes of heat and mass transfer devices of indirect evaporation type is carried out. These devices are a family of plane-parallel channels, in one of which the evaporation of water film takes place. Mathematical modeling of heat and mass transfer devices is based on solving a system of differential equations that represent the heat balance equations for each of the channels. Numerical studies are carried out in a wide range of input parameters: temperature t0 = 15÷50°C, relative air humidity ϕ0 = 20÷100%, and Reynolds number Re = 50÷1500. The assumed geometric dimensions of the channels are height H = 6 mm and length L 50H. The calculations are carried out at atmospheric pressure.
The influence of landscape and urban development on modeling of transport of pollutants in Krasnoyarsk city
Authors: Filimonov S A , Meshkova V D , Dekterev A A , Gavrilov A A , Litvintsev K Yu , Shebelev S V 
Published: November 2021

Abstract
The paper presents the numerical simulation of the distribution of pollutants in winter in the atmosphere of Krasnoyarsk city. The source of the pollution is the suburban areas of the city of Krasnoyarsk, in which coal stove heating prevails. A micro-scale mathematical model based on the solution of the system of non-stationary Reynolds equations is used for modeling. The influence of various factors, such as elements of terrain and urban development, on the distribution of pollutants is studied in the paper.
Compliance Current-dependent Dual-functional Unipolar and Threshold Resistive Switching in Silver Nanowires-egg Albumen Composites-based Device
Authors: Weng Z J , Zhao Z W , Jiang H L , Fang Y 
Published: November 2021

AbstractThe continued exploration of novel synthetic memristive materials with multifunctional properties is critical for future synapse-emulating circuits and electronic devices in the field of next-generation neuromorphic computing applications. In this work, the silver nanowires (AgNWs)-Egg albumen composites have been integrated as a resistive switching layer in the Ag/AgNWs-Egg albumen/Ag planar structure and exhibits both unipolar (memory) switching and threshold switching functions. The device in unipolar switching regime demonstrates an ON/OFF ratio above 105, a low resistance state of about 1.2 KΩ and a high resistance state of about 120 MΩ. Finally, a mechanism in combination with the conductive filament theory and a tunnelling conduction mechanism is proposed to explain the resistive switching behavior. The devices are prepared by simple and low-cost techniques, which make such devices appealing for future electronic applications.
The Quantum Calculation for Valence Band Structure of Strained Zinc-blende GaN Using Six-Band Based k·p Method
Authors: Liu Yaqun , Wang Everett X. , Zhang Gary , Li Xiyue 
Published: November 2021

Abstract
The variations of valence band energy with stress effects in zinc-blende GaN are proposed in this paper. The calculations are based on a six-band strain dependent k·p Hamiltonian, and can be self-consistently solved by Schrödinger-Poisson equation. Accurate physical pictures are given for the quantized valence subband structure under biaxial and uniaxial stress in (001) surface along the [110] direction accounting the quantum confinement effect. The warping of the energy profile results in carrier distribution change. This research will be beneficial for improving the hole mobility and the selective of optimum stress for group-III nitride semiconductor based devices.
Study on Wear Debris Characterization of Polycarbonate Urethane (PCU) as a Bearing of Artificial Hip Joint
Authors: Lestari W D , Ismail R , Jamari J , Bayuseno A P 
Published: November 2021

Abstract
As with all artificial joints, wear debris is of particular concern due to its effect on both implant life and the in vivo biological reactions that can occur. The purpose of the research is to study debris characterization of PCU. Wear particle is produced from testing the PCU material using a pin on disc wear tester within 50000 cycles. This study showed that the PCU wear debris gotten from the simulator had various different shapes, including laminar and spherical types. The morphology of worn surface and wear debris analysis showed that wear mechanism of PCU were fatigue wear. Thus we conclude that PCU is expected to be a lifetime implantation of artificial joint.
Design and Research of Highly Integrated Multi-channel Tile-type T/R Module
Authors: Chen Ziran , Huang Zhi , Zhang Qi , Zhang Meng 
Published: November 2021

Abstract
This paper introduces a design scheme and key technology of a multi-channel tile-type T/R module. In order to meet the requirements of high reliability, miniaturization, lightweight and multi-functional integration, a vertical interconnection design method of high integrated multi-channel tile-type T / R module is proposed. LTCC technology is used to achieve high-density stacking of radio frequency devices, while bare chips are used to improve system integration and reliability. The module integrates 4 isolated transceiver channels with a size of 40mm×40mm×10mm, which significantly reduces the volume and weight compared to the traditional T/R module structure. The module simulation results prove that the design scheme is easy to implement and fault location maintenance, and the test results meet the design indicators.
Development of GIS Switch State Judgment System Based on Image Recognition
Authors: Zhao WenHan , Wen Feng , Han Chen , Chu Zhoujian , Yao Qingyue , Ji Kesong 
Published: November 2021

Abstract
Aiming at the fast opening and closing speed of the GIS isolation/grounding switch, manual observation is more difficult, so it is difficult to judge the current switch status. This paper proposes an OpenCV-based image identification algorithm to identify the position of the switch movable contact during the opening and closing process of the isolating switch, thereby judging the state of the isolating switch. This system uses Raspberry Pi as the main hardware core, the server drives the CMOS camera through Raspberry Pi 4B, collects image information in the GIS optical observation window, and performs simple processing, and transmits it to the Raspberry Pi 4B based on the UDP protocol as the main core. In the upper computer and adopt the target detection algorithm based on OpenCV to track the current isolation/grounding switch contact position and determine the current opening and closing state.
LFT Bond Graph for Online Robust Fault Detection and Isolation of Hybrid Multi-Source System
Authors: Boukerdja Mahdi , Radi Youness , Omprakash  , Sood Sumit , Ould-Bouamama Belkacem , Chouder Aissa , Gehin Anne-Lise , Dieulot Jean-Yves , Bressel Mathieu 
Published: November 2021

Abstract
Green hydrogen is undoubtedly the most promising energy vector of the future because it is captured by renewable and inexhaustible sources, such as wind and/or solar energy, and can be stored over the long in high-pressure cylinders, which can be used to feed the fuel cells to produce the electricity without emitting any pollutants. The system incorporated renewable sources and process used to produce the green hydrogen is the hybrid multi-source system (HMS). The production of hydrogen needs a reliable HMS, which always requires online monitoring for real-time Fault Detection and Isolation (FDI) because the risk of accidents in HMS and safety issues increases due to the possibility of faults. However, online monitoring of FDI is challenging due to the multi-physics dynamics of HMS and the inclusion of uncertain parameters and several disturbances. This paper proposes an online robust fault detection algorithm to detect system faults based on the properties of the graphical linear fractional transformation bond graph (LFT-BG) modeling approach. Here, the analytical redundancy relations (ARRs) and their uncertain parts extracted from the LFT-BG model are used to develop an online robust FDI algorithm for HMS. Numerical evaluations of ARRs and their uncertain parts, respectively, generate the residual signals known as “faults indicators” and their uncertain bounds known as “adaptive thresholds.” These thresholds evolve with system variables in the presence of parameter uncertainties for ensuring robust FDI for HMS to minimize false alarms. The validation of this approach is carried out using 20sim software that is familiar with BG modeling.
Study on the Electrical Conductivity of Inorganic Conductive Network in Sediments
Authors: Zhao R Y , Zhao Z W , Weng Z J , Fang Y , Jiang H L 
Published: November 2021

AbstractThe inorganic conductive network provides an essential channel for electron transport and supports the biogeochemical process in sediments, but the conductive mechanism of conductive network is not well understood. In this work, theory of circuit and electronics was applied to build a three-dimensional (3D) resistivity network simulation model for exploring the conductive mechanism and analysing the effect of the particle size on the conductive characteristic of inorganic conductive network. In order to simulate the real sediment environment, inorganic composites with silica (SiO2) particles as matrix using magnetite (Fe3O4) particles as fillers are constructed. The simulation results reveal that the electrical conductivity of these composites rises nonlinearly with the increasing volume fraction of conductive fillers, which is consistent with the percolation theory. Moreover, small-sized conductive particles or large-sized matrix particles are confirmed to exert a positive part in enhancing electrical conductivity of composites.
Research on Design Electrode Channel in Microfluidic Chip
Authors: yingmei Zhou , Jian Lv 
Published: November 2021

Abstract
In recent years, microfluidic chips have been widely used in food safety, environment detection, clinical diagnosis and biochemical. However, Digital microfluidic chips(DMF) are attracting more and more eyes because picoliter-microliter-sized sample droplets can be accurately and automatically manipulated. In this paper, a method of design electrode channel height is studied to improve the efficiency of the voltage driving.
A Flexible Solar-blind Ultraviolet Photodetector based on Carbon Nanodots
Authors: Zhu Mengru , Zhao Zhiwei , Fang Yong , Weng Zhengjin , Lei Wei 
Published: November 2021

Abstract
A flexible solar-blind ultraviolet (UV) photodetector based on the carbon nanodots (CNDs) was fabricated on a polyethylene terephthalate (PET) substrate. The responsivity of 1.2 mA/W is obtained for 10 V applied bias under 254 nm illumination. Further, bending tests were carried out under the 0.2% strain, and the results showed that this flexible photodetector had stable characteristics and no obviously decrease of the photocurrent. The bending performances exhibit excellent potential for the fabrication of smart and flexible photodetectors.
Researches on the Technology of Measuring Grain Moisture based on 555 Integrated Circuit
Authors: Zhiqiang Wan , Qingqing Zhang , Liang Xu 
Published: November 2021

Abstract
Grain is the material basis of human existence and development. Food quality has an important effect on people’s physical health for our country. Moisture content of grain has been an important factor in affecting food quaility. Every year, a substantial part of the food production is lost because of too much water contained in the food without drying. According to the annual statistics of the country’s harvest, loss of food due to drying time caused by water take up 500 - 10000000 tons, according to approximate 1.5% - 3% of the total grain output.With the development of science and technology, grain moisture detection, especially the real-time and accurate detection, has attracted more and more purchase, production, processing, storage, transportation, and attention from various aspects. Under this problem context, hardware-circuit-control system of grain moisture detection based on ATmega128 has been investigated and designed.
Study on the performance of Double-pipe phase heat exchangers in waste heat recovery with heat storage and discharge
Authors: Yan Quanying , Guo Yuan , Ma Chao 
Published: November 2021

Abstract
The heat transfer performance of the double-pipe phase change heat storage and exothermic device and its cycle system for waste heat recovery was studied experimentally. 10 different experimental conditions were set by adjusting the inlet temperature, inlet flow rate and heat storage time of the phase change heat storage and exothermic device to study the changes of the outlet temperature, heat exchange and the inlet and outlet temperature of the heat sink of the heat-using device. The experimental results show that the higher the inlet temperature, the higher the flow rate and the longer the heat storage time, the higher the average heat exchange and the longer the heat release time of the heat exchanging device. The phase heat exchanger designed and used in this experimental research provides a certain experimental basis and data reference, which can be used for waste heat recovery in industrial and other fields.
Research on oil-gas Pipeline Leakage Detection Method Based on Particle Swarm Optimization Algorithm Optimized Support Vector Machine
Authors: Gao Jianfeng , Zheng Yu , Ni Kai , Zhang Huaizhi , Hao Bin , Yan Jialin 
Published: November 2021

Abstract
In order to solve the problem of low accuracy in oil-gas pipeline leak detection, a pipeline leak detection method based on Particle Swarm Optimization (PSO) algorithm optimized Support Vector Machine (SVM) is introduced. This method uses PSO to solve the penalty factor ‘c’ and kernel function parameter ‘g’, and constructs the pipeline leakage detection model of SVM. We set up an experimental platform to collect negative pressure wave signals under different working conditions. After wavelet domain denoising and data preprocessing, four eigenvalues of Mean, Standard Deviation, Kurtosis and Skewness are extracted from the signals to form the eigenvector samples, which are taken as input of SVM, and four working conditions of normal, leakage, rise and fall are taken as output. Through experimental verification, the comprehensive performance of PSO-SVM algorithm is better than that of traditional SVM, Genetic Algorithm optimized SVM and grid search algorithm optimized SVM. The POS-SVM algorithm can be applied to the leak detection of oil-gas pipeline.
Analysis of hydrogen production capacity of off-grid photovoltaic system based on PVsyst software simulation
Authors: Li Jiantao , Li Yongguang , Zhu Boxu , Ma Xinxia 
Published: November 2021

Abstract
As a typical green energy, hydrogen energy has many advantages. The traditional hydrogen production methods are more polluting. However, the use of electricity generated by photovoltaic systems to produce hydrogen can not only make full use of local solar energy resources, but also achieve environmentally friendly hydrogen production. In this work, we use PVsyst software to model and simulate a 30kW off grid photovoltaic power plant in a region of Shanghai, and calculate its power generation. Combined with the energy consumption of hydrogen production equipment, we evaluated the hydrogen production capacity and pollutant emission reductions, and we also analyzed the performance ratio and power loss of photovoltaic system, which verifies the environmental protection of photovoltaic hydrogen production, and provides a reference for photovoltaic hydrogen production researchers.
The on-line detection technology of oil level in main transformer conservator of an 110kV Substation
Authors: Liu Jun , Hu Yujing , Yang Wen , Pan Xiongwen , Li Yibin , Qu Guomin , Xie Yi , Qiu Wei 
Published: November 2021

AbstractThe oil level of transformer conservator is related to the safe operation of transformer. There is no better way to detect the oil level of the conservator, when the indication of the oil level gauge is unclear or the jam fault. Through the selection of ultrasonic sensor, design of measurement and verification device and field practice, this paper studies and develops an on-line detection technology based on the ultrasonic principle, which can effectively and accurately detect the oil level of existing conservator types such as diaphragm, capsule and corrugated conservator, and is not limited by the detection environment.
Application of Fuzzy Control in Ocean Nuclear Power Plant Control
Authors: Dai Chunhui , Song Ping , Chen Lie , Lao Xingsheng , Zhang Kelong 
Published: November 2021

Abstract
In marine nuclear power plants based on molten salt reactors, the complexity of core nuclear reactions, fuel fluidity, and the “false” water level characteristics of the steam generator water level make it unrealistic to establish an accurate mathematical model, so it is difficult to implement traditional PID control methods. This has increased substantially. The fuzzy control has a good solution to this feature. Therefore, combined with the fuzzy control that does not depend on the precise mathematical model of the controlled object, the fuzzy controller of the nuclear power plant is designed, and the control research of the core power is obtained respectively through MATLAB/Simulink simulation. It shows that the designed fuzzy controller can achieve good control of nuclear power plants.
Comparison and research of acoustic emission testing standards for atmospheric storage tank
Authors: Zhang Shuxin , Wang Weibin , Yang Yufeng , Zhang Qiang , Wu Gang , Luo Jinheng , Dong Xunchang 
Published: November 2021

Abstract
The acoustic emission testing standards ASTM E1930, BS EN 15856, JB/T 10764 and Q/SY GD 0211 for atmospheric storage tank are compared and analysed. Combined with production practice, the revision direction and reference suggestions of acoustic emission testing standards for atmospheric tank were proposed.
Applicability of single sample method to test strength parameters of sandstone
Authors: Li Shaoan , Li Wenxia , Hu Yunlei , Zhang Tao , Shi Xiangchao 
Published: November 2021

Abstract
The single sample method allows the mechanical parameters of rocks to be obtained with very few rock samples; however, the method has not been widely used. This is mainly because the yield point of the single sample method is more difficult to control than the conventional triaxial compressive test and the effect of the different control methods on the measured data is not well understood. The single sample method obtains the strength parameters of the rock by loading a single rock sample with multiple stages of confining pressure. Multistage loading tests are divided into peak strength control and long-term strength control according to yield point control. In this study, multistage loading tests of sandstone were carried out to obtain strength parameters using long-term strength control. The results show that sandstones undergo seriously brittle damage in conventional triaxial compressive tests. Although the sandstones have been rigorously selected, they still vary considerably, and long-term strength points are more difficult to control. The error of strength parameters of sandstone obtained using the single sample method may exceed 20% compared to those obtained by conventional triaxial compressive tests. So this method must be used with caution for sandstones.
Research on Special Support Technology of Gob-side Entry Retaining with Filling the Non-roadway Side in the Thin Coal Seam
Authors: Feng Renjun 
Published: November 2021

Abstract
By taking a certain mining area of No.2 coal seam in a coal mine as the research object, special support technology of gob-side entry retaining with filling the non-roadway side was researched. Based on the geologic features of this mining area, support method of gob-side entry retaining was proposed. The method replaced the dense wood prop with single prop, and cooperated intersection hinge roof. The support parameters were calculated, and time-space coordination between each support process was researched. The field measured data showed that this support method had a remarkable effect and strictly controlled the deformation of gob-side entry. This research formed a support system and mining system based on this condition. It has important reference meaning to safe and efficient mining coal resource with similar geologic condition.
Influence of Soft Segment Molecular Structure on Physicochemical Properties of Cellulose Nanocrystals based Polyurethane
Authors: Zhang Maolan , Wang Jiale , Li Yan , Lu Xiujuan , Liao Xiaoling , Zeng Guoming 
Published: November 2021

Abstract
SPUs are commonly used in clinic due to their good biocompatibility and can respond to different external stimuli. Among them, introducing CNCs into PUs to prepare water-driven PUs had attracted increasing attention. Herein, we report two new types of CNCs based PU nanocomposites by chemically cross-linking CNCs and PDLLA soft segment with flexible PEG chain or rigid piperazine ring structures. Specifically, the prepared nanocomposites were characterized by their morphology, chemical structure, thermal property, hydrophilicity as well as crystallinity, and the results showed that regardless of the molecular structure of the PDLLA, chemically cross-linking CNCs and PDLLA could significantly improve their compatibility. In addition, when the soft segment contains hydrophilic flexible sections, ie, PEG 200, the compatibility of CNCs with PU and crystallinity of obtained materials were better, and when the PDLLA contains a rigid cyclic structure, the thermal stability of obtained CNCs based PU would be more excellent. These results suggest that we can design the soft segment molecular structure of CNCs based PU to meet the performance requirements of different biomedical applications.
Study on Oil Absorption Properties of Magnetic Chitosan Stearic Acid Compound
Authors: Zhang Ya , Wang Yuyi , Nie Wen , Zheng Han , Wang Qihao , Long Yunqian 
Published: November 2021

Abstract
The magnetic chitosan-stearic acid compound was prepared for using chitosan and stearic acid. The morphology, structure and hydrophobic property of the magnetic chitosan-stearic acid compound were characterized. The influences of oil type and temperature on its oil absorption performance were determined. The results shows that the magnetic chitosan-stearic acid compound has a fluffy structure with a contact angle of 133.65°, indicating that the compound has a good hydrophobic property. Different oils have various impact on the oil absorption performance of the magnetic chitosan-stearic acid compound. The magnetic chitosan-stearic acid compound has the best oil absorption to crude oil, with an oil absorption rate of 4.12 g/g. With the increase of temperature, the oil absorption rate first increases and then decreases. There is an optimal temperature for oil absorption, with a temperature of 40°C.