bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comprehensive Recovery of a High-sulfur Copper-gold Ore in Shandong
Authors: Ji Qiang , Li Guangsheng , Zhu Xingfu , Gao Tengyue , Qin Guanglin , Qin Xiangwei , Wang Junjie , Zhang Xiaoguang 
Published: June 2023

Abstract
The raw gold grade of a mine in Shandong is 1.42 g/t, and it is accompanied by copper and sulfur minerals, and the embedding is closely related, so it is difficult to obtain the ideal index using the original flotation process. In order to realize the effective recovery of gold, copper, and sulfur, the test study of mixing-separation flotation and priority flotation is carried out. The results show that the mineral is more suitable for the beneficiation process of mixing-separation flotation. The recovery rate of gold, copper, and sulfur is 70.42%, 93.58%, and 68.85%, and the recovery rate is 22.89% higher than the priority flotation. The produced copper and gold mixed concentrate and sulfur concentrate can be directly sold to realize the effective recovery of gold, copper, and sulfur.
Application of well testing technology in YT1 condensate gas well
Authors: Zhang Jiping 
Published: June 2023

Abstract
YT1 is an offshore condensate gas well. During gas testing, well testing is carried out to determine the productivity of the well. The productivity equation is established by modified isochronal well testing. The flow pressure change trend with production under different working systems is compared with the dew point pressure of the gas reservoir under the condition of retrograde condensation to determine the reasonable production differential pressure to avoid the abnormality of productivity equation and calculate the open flow and the reasonable working system. Formation parameters are calculated such as formation pressure, skin factor, effective permeability, flow coefficient, and test radius through pressure build-up test while reservoir type, boundary, and dynamically controlled reserves are determined. According to the analysis results of productivity and reserves, considering the investment cost of offshore gas reservoir development, storage, and transportation, we can comprehensively evaluate the economic rationality of YT1 well construction and production, providing reference experience for improving the benefits construction and production level of the offshore condensate gas reservoir.
Development and experimental study of a long-time monitoring system for mine water damage electrical information
Authors: Wang Yue , Wang Pengyu , Yi Xiaofeng 
Published: June 2023

Abstract
The change of mining stress often accompanies coal mining; these changes will affect the underground pressure water, destroy its original equilibrium state, increase the possibility of underground pressure water upward gushing, and then lead to the occurrence of mine water inrush accidents. A long-time monitoring system of mine water damage electrical information is developed to realize the long-time monitoring of mine underground pressure water. Based on the principle of resistivity tomography, this paper analyzes the method’s feasibility in inferring different geological distributions. Secondly, the long-time monitoring system of mine water damage electrical information is introduced. Finally, the stability and reliability of the instrument were proved by the simulation experiment, and the instrument was installed in the 17-33200 working face of Ping Coal No. 10 Mine, Pingdingshan City, Henan Province, China, for actual measurement to obtain the electrical information data of working face floor.
Load Simulation Analysis of 1.5 MW Horizontal Axis Wind Turbine
Authors: Bai Dongxiao , Han Shichang , Zhao Zhenzhou 
Published: June 2023

Abstract
Wind turbine blades are subjected to a variety of loads in actual operation, which are prone to deformation and cause the strain and stress concentration of the blade structure, thereby affecting the safe operation of the wind turbine and the service life of the blade. Therefore, a numerical simulation study on the coupling of wind turbine blade loads with their displacement, deformation, and stress is carried out. The results show that at the same wind speed, as the wind turbine speed increases, the pressure on the windward side of the blade increases, the negative pressure on the leeward side decreases, the pressure difference between the two sides increases, and the maximum pressure is distributed in the tip of the blade; the blade is under different loads, among which the aerodynamic load is the main factor affecting blade deformation and stress generation. The maximum deformation of the blade appears in the direction of the swing.
Variable operating conditions characteristics of circulating wheel dehumidification air conditioning system
Authors: Du Zhehua 
Published: June 2023

Abstract
For its efficient application of low-grade energy, the circulating wheel dehumidification air conditioning system has received a lot of attention and research in response to the shared challenges of environmental protection, energy conservation, and low carbon. Desiccant wheel dehumidification air conditioning systems can recycle waste heat as a desiccant wheel regeneration heat source and improve air quality, which is expected to achieve low energy consumption and high-efficiency dehumidification. The desiccant wheel dehumidification air conditioning system is divided into a treatment air channel and a regenerative air channel. Treated air is directly sent to the air conditioning room after dehumidification and cooling, and regenerative air is directly discharged to the outdoors after the completion of regeneration. Therefore, a new type of recirculated desiccant wheel dehumidification air conditioning system is established. In this paper, the experimental study of the circulating regeneration wheel dehumidification air conditioning system is carried out. Dehumidification characteristics under variable working conditions are quantified and studied. Compared with the water cooling unit, the dehumidification rate of the new circulating wheel air conditioning system is improved effectively. The effects of different treated air temperatures (28 °C–40 °C) and treated air relative humidity (50%–85%) are obtained. The experiment shows that the proposed air conditioning system can effectively improve the dehumidification rate compared with the conventional direct condensation of seawater. Under the same circulating shunt coefficient, the system dehumidification rate increases gradually with the increase of the temperature and humidity of the treated air and the temperature of the reclaimed air. The dehumidification rate has an optimal value, and the corresponding optimal circulation shunt coefficient is 50%–75%, which decreases with the increase of the temperature and humidity of treated air and increases with the increase of the temperature of regenerated air.
Short-term wind power prediction based on DWT-PSO-LSTM
Authors: Zong Changsheng , Gao Qingzhong , Wu Shuai 
Published: June 2023

Abstract
With the “carbon peaking and carbon neutrality” target, quite a few people are focusing on the development of renewable energy, especially wind power, which is the largest source of renewable energy generation and is still expanding. In aiming to make the wind power forecasts more accurate by limiting the errors between the predicted and actual values, a model combining Particle Swarm Optimization, Discrete Wavelet Transform, and Long Short-Term Memory (DWT-PSO-LSTM) is developed to predict the wind power for short periods. First, the wind power is decomposed and normalized by DWT. Then, each decomposition result is input into LSTM prediction, and the model with the good result is obtained by finding the number of nodes and learning the efficiency of the best LSTM through PSO. Finally, the full prediction results are output and then all components are summed. Simulations using open wind power data from Yalova province, Turkey, indicate that the model advanced in this article can reduce the prediction errors better than other models.
Viscosity, activation energy, and CO2 diffusion coefficient of non-aqueous solutions of 3-methylamino propylamine (MAPA)/3-dimethylamino-1-propylamine (DMAPA) with polyethylene glycol (PEG200)
Authors: Zhao Yuetong , Jin Fazhou , Sun Yanli , Wang Lemeng , Fu Dong 
Published: June 2023

Abstract
In this paper, viscosity (η) of 3-Methylaminopropylamine (MAPA)/3-dimethylamino-1-propylamine (DMAPA) with polyethylene glycol (PEG200) was detected over the range of (from 303.2 K to 323.2 K) temperature with amine mass fractions in the range of (from 0.30 to 0.60) at atmospheric pressure. The dependence of η on temperature and mass fractions was clarified. On the experimental basis, the activation energy (Ea) and CO2 diffusion coefficient (D
CO2) in MAPA/DMAPA-PEG200 non-aqueous solutions were deduced.
Liquid Level Measurement and Control in High Temperature and High-pressure Environments of Nuclear Power Plant
Authors: Hu Yanjun , Xu Tianxiang , Gan Changxian , Zhu Qinglian , Liu Shengzhi 
Published: June 2023

Abstract
There are many pieces of high-temperature and high-pressure system equipment in nuclear power plants, such as deaerators, high-pressure feedwater heaters, steam-water separation reheaters, etc. The media parameters in these systems and equipment are high and the working conditions are complex. It is necessary to solve the above problems by adopting multi-channel averaging, increasing the slope of the condensing line, and separating the sampling ports of multiple channels. After practical verification, the above solution can effectively solve or reduce the above problems, which can provide a reference for the liquid level measurement and control in subsequent similar high-pressure and high-temperature environments in nuclear power plants.
Waste Heat Recycling Absorption Refrigeration Circulation System
Authors: Wang Xinjun , Zhou Qingyang , Cai Yanping , Yu Xinyu 
Published: June 2023

Abstract
To maximize energy use, this paper designs a lithium bromide absorption refrigeration system that is used to recycle and use low-temperature energy and industrial residual heat. Firstly, the mathematical model of the system is established using the lithium bromide aqueous solution status equation and the equation of the state of water and steam to obtain the state parameters in the thermodynamic calculation process of the system. Secondly, according to the principle of mass economy, energy saving, and heat transfer, the thermodynamic parameters of each process of the system are obtained to assist the design of the system. Finally, the influence of some key parameters on the system is simulated and analyzed to obtain the optimal parameters which can make the system recovery efficiency the highest. The simulation results show that the system conceived in this article can efficiently recycle waste gas and achieve the purpose of refrigeration. Therefore, it has a certain value of popularization.
Structural Optimization and Simulation of a Magnetic Leak Detection Device for Streak-like Defects in Oil Pipes
Authors: Zhou Feng. , Zhang Dali. , Zhao Han. , Hu Heng. 
Published: June 2023

Abstract
Striped defects are a common type of defects in oil pipelines, divided into horizontal and longitudinal stripes, and it is difficult to accurately quantify the results of conventional pipeline leakage magnetic detection to correspond to the type of defects and their extent. In this paper, a new type of oil pipe non-destructive testing equipment is proposed and designed based on the principle of magnetic leakage detection using three-dimensional finite element simulation, and the magnetic field distribution inside the equipment is simulated using ANSYS finite element analysis software to provide original data reference for the development of the new equipment.
An Online Junction Temperature Monitoring Method for SiC MOSFET Based on Drain-source Voltage Change Rate During Turn-on Transient
Authors: Guo Yahui , Sun Peng , Li Huanlin , Cai Yumeng , Zhao Zhibin 
Published: June 2023

Abstract
This paper analyzes the turn-on transient of silicon carbide (SiC) metal oxide semiconductor field effect transistor (MOSFET) based on the basic physical equation, and the analysis model of drain-source voltage change rate (dv
ds/dt
) during turn-on transient is derived. The change rule of dv
ds/dt
of SiC MOSFET during turn-on transient and its temperature-dependent characteristics are studied, and the calculations generally fit the measurements well. Experimental results show that the magnitude of turn-on dv
ds/dt
increases with increasing temperature and exhibits good linearity. The influence of driving conditions on the temperature dependence of the turn-on dv
ds/dt
is also analyzed through the model, finding that the temperature sensitivity can be improved by reducing the driving forward bias voltage and increasing the driving resistance. Finally, the online junction temperature monitoring experiments are used to verify the accuracy and effectiveness of the proposed method.
Operating flow rate prediction of H4 condition in NPP
Authors: Deng Chunyin , Chen Guoxing , Liu Shengyong , Yao Zhimeng , Zhang Wenli , lu Zhuang , Wu Shuhui 
Published: June 2023

Abstract
In this study, we present a method to predict the working volume flow rate of H4 conditions in nuclear power plants. The working flow rate can be predicted using the intersection points of the two curves on a hydraulic characteristic diagram using the quantitative relationship between fluid flow and pipe resistance under the turbulence model and the hydraulic performance characteristics of the hydraulic equipment. The H4 condition volume flow rate of a power plant is predicted in this research using this method. The findings demonstrate that the method can substitute the actual H4 working condition test to lower operating costs while having high accuracy and little deviation. This approach can be usefully expanded to cover more comparable circumstances.
Research and implementation of debugging method of digital phase-locked loop
Authors: Li Yonggang , Li Yingtao 
Published: June 2023

Abstract
This paper studies the commissioning method of phase-locked loops to enable the phasemeters to achieve the required frequency and phase accuracy. The influence of different phasemeter structures on performance is explored. Through theoretical analysis and experiments, the debugging process of the phase-locked loop is clarified, which can meet its basic indexes, especially frequency and phase accuracy, and is optimized for its traditional structure.
Segmented sensor blockchain based on state and block compression
Authors: Wang Xinhong 
Published: June 2023

Abstract
In the sensor blockchain network, sensors need to collect data continuously and upload it to the blockchain network for verification of data integrity. The deployment of smart contracts on the chain can be used to authenticate data visitors. Historical data is valuable for data visitors, but it is useless for sensor nodes that can continue to link data only with current information. With the passage of time, the data of the sensor blockchain network will continue to grow. A node data storage mode that can adapt to the continuous expansion of the blockchain scale is needed, which can encourage nodes to join the network to participate in consensus and jointly maintain the security of the blockchain data. This paper provides a segmented storage solution based on state and block compression for sensor device nodes with limited storage capacity. After experimental verification, this scheme can significantly reduce the storage cost. It allows nodes to use blockchain for a long time in sensor blockchain networks with large transaction volumes and a large number of smart contracts and allows new nodes to be deployed faster.
Parameter Estimation and Mutual Coupling Self-Calibration with Orthogonal Polarization Sensitive Array
Authors: Qu Zhiyu , Zhang Xin 
Published: June 2023

Abstract
In order to address the mutual coupling impact with orthogonal polarization sensitive array, the mutual coupling self-calibration strategy is suggested in this study. Firstly, the mutual coupling properties are used to modify the steering vector of the array. By transforming the matrices, the properties of the polarization and direction-of-arrival (DOA) are isolated from the mutual coupling coefficients. Then, using the rank deficit matrix approach, the estimated the polarization properties and DOA values of the incoming signal are ascertained. The eigendecomposition of the transition matrix utilizing the modulus restrictions is then used to get the mutual coupling coefficient. The technique may be used to produce high-precision results of the mutual coupling coefficient when there is a substantial gap in the power of the signal sources. The outcomes of the simulation demonstrate the viability of the advanced method used in this work.
Magnetic Field Downward Continuation Iterative Method Based on Low-pass Filter
Authors: You Guanjie , Yu Ziqiang , Wang Ze , Pan Mengchun , Xu Yujing , Zhang Qi 
Published: June 2023

Abstract
Magnetic field downward continuation is an important technique for expanding geomagnetic database, which can separate superimposed anomalies and enhance the resolution of local anomalies. However, the adaptability of the fixed filter operator of the existing downward continuation algorithm to the wavenumber domain frequency component of the observed data is not good enough, which leads to the poor applicability of the algorithm, resulting in poor applicability of the algorithm. The downward continuation iteration method based on a low-pass filter is proposed in this paper. First, the residual terms based on the remainder of the first and second vertical derivatives are constructed by using the stability of upward continuation; Secondly, the upward continuation low-pass filter operator, single parameter low-pass filter operator, and two-parameter low-pass filter operator are designed, and the effects of their filtering characteristics on the continuation stability are compared. At the same time, the cut-off frequency and order of the filter operator with parameters are optimized to update the iterative value. Simulation and experimental studies are carried out under different field source depths. Simulation results show that the convergence performance of this method is better when dealing with shallow source field, and the continuation accuracy is improved by 15%–25%. The stability and effectiveness of the magnetic field downward continuation method are verified by the measured data.
A six-digit digital attenuator working in the Sub6G band
Authors: Liang Peijie , Zhang Miao , Wang Peng , Li Chengyu 
Published: June 2023

Abstract
A high-performance 3–6 GHz monolithic digital control attenuator chip is designed by using a 0.25 μm GaAs pHEMT process. The circuit adopts a cascade structure of 6 basic attenuation units, and 64 attenuation states are formed by controlling the on-state combination of different attenuation bits, and the attenuation structure connected in parallel to the attenuation resistor is given. The main simulation results show that the designed digitally controlled attenuator takes 0.5dB as the attenuation step, and the maximum attenuation value is 31.5 dB, an insertion loss of less than 2.55 dB, a return loss better than -15 dB, an attenuation accuracy of less than 0.5 dB for all states, an additional phase shift of less than -5°, a root mean square error better than 0.23 dB of attenuation amplitude, and chip size of 1.88 mm×1.0 mm.
Offloading Decision and Resource Allocation for Satellite Edge Computing
Authors: Xing Hao , Li Tong , Diao Wenlan , Wang Xiaotian 
Published: June 2023

Abstract
Plenty of research show that edging computing can be applied in satellite network and it has been a hotpot. By deploying the MEC server, satellites can provide enough computing resources for tasks and reduce the delay required for task processing. Compared with traditional edge computing architectures, satellite edge computing (SEC) has a greater coverage area. In this paper, offloading decisions and resource allocation in low-orbit satellites are considered and an optimization algorithm MMTORA is proposed. The algorithm decomposes the problem to be optimized into two sub-problems, and they can be solved by the Nash equilibrium solution and Lagrange multiplier algorithm, respectively. We demonstrate that MMTORA can converge quickly and prove its superiority through simulation results.
Ship Detection in SAR Images via Kullback-Leibler Divergence-Based Matrix Information Geometry Detector
Authors: Xie Zhaozhe , Cheng Yongqiang , Wu Hao 
Published: June 2023

Abstract
Ship detection in synthetic aperture radar (SAR) imagery is an important application in the field of marine remote sensing. As the most common method in ship detection, classical constant false alarm rate (CFAR) methods rely on the target-to-clutter contrast and accurate estimates of distribution models, making it difficult to adapt to complex and variable sea surface backgrounds. Considering the limitations of the CFAR methods, this paper proposes a new detector for ship detection based on matrix information geometry (MIG) theory. The proposed detector models each SAR sample data as a Hermitian positive-definite (HPD) matrix, and uses the geometric mean of all HPD matrices corresponding to the background window to estimate the clutter, thus transforming the target detection problem into a measure of the Kullback-Leibler divergence (KLD) between two points on the matrix manifold. Different from the traditional CFAR detectors which use intensity information to differentiate between targets and clutter, the proposed detector utilizes the intrinsic geometry of the matrix manifold and employs KLD with good differentiation to measure the variance from targets to clutter.
The Attenuation calculation method for the underwater low-frequency magnetic field of finite-length straight wire
Authors: Wang Xinyi , Jiao Yucheng , Zhang Guoguang 
Published: June 2023

Abstract
Usually, when solving the magnetic field distribution of a finite-length straight wire in a conducting medium, numerical calculation is required. However, this method has some disadvantages, such as complex calculations and not being conducive to engineering implementation. To solve this problem, this paper studied the attenuation calculation method for the underwater low-frequency magnetic field of the finite-length straight wire and then obtained the analytical calculation formula of magnetic field spatial distribution. The simulation results show that, within a certain distance, the analytical method is in good agreement with the numerical calculation results. The method presented in this paper is convenient for calculation and has good engineering practicability.
Portable Magnetic Detectors Based on TMR Sensors
Authors: Li Zihao , He Anran , Zhu Haobo , Wang Hai , Zhao Yinhan , Kong Xiangyan 
Published: June 2023

Abstract
The tunnel magnetoresistance sensor (TMR) is the fourth generation of the industrial magnetic sensor, which has the characteristics of low power consumption, high sensitivity, and low- temperature dependence. The portable magnetic detector based on the TMR sensor can effectively pick up the magnetic signal by gradient probes based on TMR sensors. After the magnetic signal is amplified, filtered, and normalized, the magnetic source orientation and amplitude are displayed on the LCD screen. The experiment proves that the portable magnetic detector can effectively detect a magnetic field larger than 100 NT at a distance of 30 cm, and the design meets the experimental requirement. It is of great practical significance to detect the magnetic source in an unshielded indoor environment.