bluuebunny/crossref_metadata_2025_split huggingface dataset:
The research of data retention of HfO2 as trapping layer: First-principles study
Authors: Jiang Xianwei , Wang Feifei , Wang Haibo , Yang Jin , Lu Shibin 
Published: November 2019

Abstract
The influence of the Charge Trapping Memory storage feature was researched by doping the substitutional impurity Al and introducing oxygen vacancy within HfO2. Materials studio and Vienna Ab-initio Simulation Package were used to investigate the influence of doping Al on the formation of the oxygen vacancy in HfO2 as trapping layer. At the same time, the interaction energy of two defects under different distances was calculated. The calculation results show that doping the substitutional impurity Al reduces the formation energy of oxygen vacancies in the HfO2, and the reduced formation energy of the three-fold-coordinated O vacancy is larger than that of the four-fold-coordinated O vacancy. After having studied three different defect distances between substitutional impurity Al and three-fold-coordinated O vacancy, the results indicate that the system acquires the largest charge trapping energy, the most quantum states when the distance of the defects is 2.107Å. As a conclusion, the data retention in the trapping layer of monoclinic HfO2 can be improved by doping the substitutional impurity Al. This work will provide a theoretical guidance for the performance improvement with respect to the data retention of Charge Trapping Memory.
Research on synthesis and properties of amphoteric early strength polycarboxylate superplasticizer
Authors: Lai Guangxing 
Published: November 2019

Abstract
The amphoteric early strength polycarboxylate superplasticizer (AE-PCE) was synthesized by free radical aqueous solution polymerization, and using acrylic acid (AA), isobutylene alcohol polyoxyethylene ether (HPEG, molecular weight 4000) and dimethyl diallyl ammonium chloride (DMDAAC) as monomers. In this work, the structure of AE-PCE were characterized by FTIR, the hydration behavior of concrete were investigated by using TAM AIR isothermal microcalorimetry and scanning electron microscope, and properties of AE-PCE were studied by cement paste and concrete experimental. The results show that the quaternary ammonium cationic functional group has been successfully introduced into the molecular structure of polycarboxylate superplasticizer. The synthesized amphoteric early strength polycarboxylate superplasticizer (AE-PCE) can accelerate the hydration rate, significantly shorten the setting time and improve the early strength of concrete, and the effect of promoting coagulation and early strength is better than similar foreign products. Applied to the production process of subway shield segments, AE-PCE can effectively shorten the demoulding time of shield segments and improve the production efficiency under low temperature conditions in winter.
Study on Preparation and Performance of Steel Slag Asphalt Mixture Based on Steel Slag Aggregate
Authors: Yan Zhou , Hao Zhang 
Published: November 2019

Abstract
The comprehensive utilization of steel slag has always been a worldwide problem. Under the background of vigorous development of highways in China, the application technology of steel slag in asphalt concrete will make the steel slag resources hopefully get a large number of reasonable utilization. Based on the application of steel slag in asphalt concrete, the basic physical and chemical properties of different types of steel slag were investigated. The blast furnace slag was used as the aggregate to prepare the asphalt mixture. The mixture was tested by research and test. The uniaxial compression test and the indirect tensile test were used to evaluate the low temperature crack resistance and fatigue resistance. The test results show that the surface texture of steel slag is rough and the embedding effect is good, which is beneficial to enhance the adhesion with asphalt and improve the shear resistance. The steel slag asphalt mixture has good low temperature deformation ability and small expansion ratio, which can be paved to meet the driving conditions. Required asphalt concrete pavement.
Design of a Time Discriminator in a Low-background, Anti- Compton Spectrometer
Authors: Li Xin-Chi , Zeng Guo-qiang , Yan Lei , Bai Bin , He Li , Ge Liang-Quan , Hu Chuan-Hao , Hou Yang 
Published: November 2019

Abstract
Compton scattering leads to the incomplete deposition of particle energy and produces a Compton scattering background, which decreases the measurement accuracy of low-energy rays. The low-background, anti-Compton spectrometer outputs 7-channel time signals through coincidence detector. The Compton events can be identified and reduced by the inverse coincidence of these time signals with the energy signals coming from the High Purity Germanium (HPGe) Detector. The precise-time measurement circuit can pulse shape the signal from the coincidence detector and accurately draw the arrival time of the signal. This is the key for a low-background, Compton-suppressed spectrometer to realize accurate anticoincidence measurements. In this study, a constant fraction discriminator (CFD) circuit was designed to replace the traditional leading-edge timer. A constant fraction discriminator-based all-pass filter without a delay line was used as the delay module. The advantages of the proposed method include the integration of circuits, low power consumption, and low cost. The simulation nuclear signals with different amplitudes, which were measured using the proposed CFD design, were outputted using the signal generator. The maximum deviation of the circuit triggering ratio was 2.5% and time jitter was 1.6 ns. The anti-Compton spectrometer with constant fraction discriminator has good Compton suppression effect. The peak-to-Compton ratio of the Compton-suppressed spectra is 1333:1 and the Compton-suppressed coefficient is 6.3.
Impact of vessel activities in the surrounding waters of China on mainland air quality
Authors: Zheng Wang , Cuihong Qin , Wei Zhang , Ying Liu 
Published: November 2019

Abstract
Based on the WRF-CMAQ air quality model, quantitatively simulate the impact of the main air pollutant emissions from the ship transportation activities in the surrounding waters on the urban ambient air quality in coastal areas. The results show that in 2014, the annual average contribution rates of NOx, SO2, PM2.5 and PM10 generated by ship activities in coastal areas of China were 5.95%, 2.20%, 1.46% and 1.41%, respectively. The time difference between ship emissions and air quality impact is significant. The average contribution of ships in April and July is about 10% and 3.5%, and the contribution in January and October is only 2% and 0.93%. The contribution rate of ship activities to the annual average concentration in the coastal waters of China is less than 6%. The impact of coastal ship operations on ambient air quality is generally small..
Current Research and Prospect of Cloud Application in Manufacturing Equipment Design
Authors: Wang Miao , Zhang Zhenming , Zhang Zhicheng 
Published: November 2019

Abstract
Equipment manufacturing industry leads the development of manufacturing industry, which is the pillar industry of the country. Its design process is long-term and complex. This paper summarizes the characteristics of equipment manufacturing industry and its design, summarizes and analyses the mainstream design methods in recent years, describes the key technologies, and preliminarily discusses the development trend of cloud design in equipment manufacturing industry.
Experimental investigation of effect of the surface texture configuration on hydrodynamic performance under oil lubricated rotating condition
Authors: Chen Juan , Zeng Liangcai , Lu Yan , Chen Kuisheng , Zhan Congchang 
Published: November 2019

Abstract
A series of experiments is conducted to investigate the hydrodynamic performance of samples with different surface texture configurations. Two kinds of dimple texture configurations are designed: circumferential radiation distributed partial texturedsample and equal distance distributed fully textured sample. The none textured sample is taken as a contrast one. In the test, gap between tested specimen and the geometric probe is set at 20 μm. By changing the rotating speed of the geometric robe, the load-carrying capacity measured is constantly changing. It is found that the load-carrying capacity is strongly influenced by the surface texture configuration and the operation condition.
Nonlinear numerical analysis of a thin current-carrying frustum shell based on magnetic-mechanical coupling
Authors: Bian Yuhong , You Qun , Zhang Chen 
Published: November 2019

Abstract
A nonlinear magnetoelastic problem for a thin current-carrying frustum shell under the interaction of an electromagnetic field and a mechanical field is studied, and the numerical calculation method is given. The magnetoelastic basic equations of the thin frustum shell are derived. The linearized iterative equations are developed. The stresses and deformations in a thin current-carrying frustum shell under the interaction of electromagnetic field and mechanical loads are calculated by considering a specific example. The magnetoelastic effect on the thin frustum shell by electric current density and magnetic induction intensity is studied. The results show that the stresses and deformations in thin shells can be controlled by changing electric current density or magnetic induction intensity.
STUDY ON OPERATION AND MAINTENANCE RESOURCE SCHEDULING METHOD OF POWER GRID MARKETING SYSTEM BASED ON SENSITIVITY CLUSTERING
Authors: Qiao Lin , Song Qing , Wang Xue 
Published: November 2019

Abstract
Aiming at the problem of low precision in operation and maintenance resource scheduling of traditional power grid marketing system, a method of operation and maintenance resource scheduling of power grid marketing system based on sensitivity clustering is proposed. Use operation and maintenance technology to collect key data of power grid, application operation state and online data of operation supporting environment, and integrate resources. On this basis, resource scheduling processing is carried out after analyzing resource scheduling requirements. The resource table and corresponding resource fields are selected to obtain the operation and maintenance resource scheduling set of the power grid marketing system, so as to realize the operation and maintenance resource scheduling of the power grid marketing system. The experimental results show that this method is more accurate than the traditional one and has practical application significance.
AN OUTLIER DETECTION METHOD OF LOW-VOLTAGE USERS BASED ON WEEKLY ELECTRICITY CONSUMPTION
Authors: Xiao-feng Tang , Rui Huang , Qi Chen , Zhao-yi Peng , Hao Wang , Bi-heng Wang 
Published: November 2019

Abstract
A method of detecting abnormal electricity consumption behavior of low-voltage electricity consumption users based on weekly electricity consumption is proposed. Firstly, features of weekly electricity consumption curve data are extracted from the actual daily consumption data. Fuzzy C-means clustering algorithm is used to classify electricity consumption behavior. Typical weekly electricity consumption characteristic curves of low-voltage power users are obtained, and then low-voltage users with abnormal electricity consumption are marked based on distance. The effectiveness and feasibility of the algorithm are verified by the actual electricity consumption data of 15 stations in Yang-Zhou City.
Research on Environmental Risk and Hidden Dangers in Civil Engineering Field
Authors: Wang Haiyan , Liu Leilei 
Published: November 2019

Abstract
Based on the related results of accident causation research and the characteristics of engineering construction environment in civil engineering field, this paper puts forward the research method of integrated prevention and ore-control integration for engineering environmental risk in civil engineering field and hidden danger investigation, including the basic concepts and engineering connotations, and proposes the first process. The environmental risk list, then determine the monthly control plan according to the progress of the project, and finally implement the three-stage dynamic such as the daily hidden danger investigation according to the in civil engineering field and control requirements, and modify and update the environmental risk in civil engineering field and control list according to the situation of the hidden dangers on the spot.
Simulation Analysis for Deployment Motion of SMPC Deployable Antenna
Authors: Jia Baoxian , Bian Wenfeng , Peng Ning 
Published: November 2019

Abstract
In order to predict the deployment time of deployable antenna and whether the deployment of the antenna meets the overall design requirements of the satellite, it is necessary to analyze the whole movement process of the antenna from folding to final unfolding. Before the ground simulation experiment of antenna deployment, the motion analysis of the deployment process is of great significance. In this paper, the deployment process of deployable antenna is analyzed by kinematics. Based on the theoretical model of a single antenna, the differential equation of motion of the deployment process is established. Based on ADAMS virtual prototyping technology, the prototype model of satellite and antenna is established, and the deployment process of the single antenna is simulated. The time-varying curves of the angle and moment during the deployment of the antenna are obtained by simulation. The changes of the position and velocity of the satellite mass center during the deployment of the antenna are studied. The influence of antenna deployment on the position and attitude of satellite body is analyzed.
Experiments on Simulation Microgravity of Composite Deployable Antenna
Authors: Jia Baoxian , Bian Wenfeng , Peng Ning 
Published: November 2019

Abstract
After the satellite is launched into a special orbit in space, its space environment is zero gravity or microgravity. Therefore, in ground simulation experiments, it is necessary to consider overcoming the gravity of the earth and try to reduce or eliminate the influence of gravity. In this paper, the method of counteracting gravity by air-floating platform is used to simulate the space microgravity environment, and to do the unfolding experiments for single deployable antenna. After the deployment of the single antenna, the connection structure of single antenna is tested by modal experiment. The microgravity simulation experiment shows that the shape memory hinge can normally satisfy the folding and unfolding of a single antenna. The whole unfolding process is smooth and there is no obvious vibration. The first six modes and natural frequencies are obtained and compared with the simulation results. The comparison shows that the experimental results are in agreement with the simulation results.
Research and application of low voltage ride through capability of wind turbines in microgrid
Authors: Li Guanglei , Yuan Shuai , Jin Fei , Liu Xiaoliang , Zhao Peng 
Published: November 2019

Abstract
In order to adapt to the stable operation of microgrid operating conditions, asynchronous constant speed wind turbines need to have low voltage ride through capability. For the characteristics of a certain type of asynchronous wind turbine,the technical control of full-power back-to-back converter is proposed. The machine-side converter stabilizes the stator voltage, the grid-side converter stabilizes the DC bus voltage and controls the active and reactive decoupling. The 750 kW wind turbine simulation model is established in MATLAB/Simulink, and the rectified unit is field tested and verified to have low voltage ride through capability.
Application Analysis of LS Channel Estimation for Transform Domain Communication System
Authors: Li Xiazhao , Ren Qinghua , Li Ming , Wu Jialong 
Published: November 2019

Abstract
To reduce the influence of wireless transmission channel on transform domain communication system (TDCS) and improve the channel estimation accuracy, a system model of Least Square (LS) channel estimation on TDCS is established. In this paper, the influence of the unavailable frequency existing in basic function is analysed for the LS channel estimation, then the expression of mean square error (MSE) is derived. After that, the frequency pilot insertion pattern and the interpolation algorithm suitable for TDCS is proposed. The simulation results verify the paper’s theoretical analysis, and the effectiveness of the proposed algorithm is proved by the comparison of the MSE and BER performance.
Dynamic Reactive Power Coordination Control Method for UHVDC Converter Station
Authors: Li Hui , Wang Zhen , Liu Pengfei , Wang Wen , Zhou Ting , Mao Wenqi , Liu Haifeng , Wang Xiaofei 
Published: November 2019

Abstract
In recent years, UHVDC transmission has developed rapidly. However, large-capacity DC converters generally use semi-controlled devices. The receiving converter station consumes a large amount of reactive power, which is easy to change when the AC bus voltage drops. The commutation failure happened, and more reactive power is absorbed from the AC system, which threatens the stability of the bus voltage. In order to study the dynamic reactive power coordination control strategy of UHVDC converter station, this paper compares the commonly used reactive power compensation equipment, and points out that synchronous condenser (SC) has significant advantages in reactive power regulation. This paper proposes a DC control system and SC coordination control scheme, and simulates the strategy through the electromagnetic transient simulation software PSCAD. The simulation shows that the synchronous condenser can provide continuously adjustable dynamic reactive power support during the change of the system switching filter, avoiding the risk of grid voltage drop exceeding the limit and improving the stability of the AC bus voltage.
A Design for Medium Voltage Inverter DC Bus Sampling Circuit
Authors: Ma Shufang , Xue Bin 
Published: November 2019

Abstract
This design is aimed at a 1140V medium voltage converter for mining industry, which can sample the high voltage DC bus voltage of the frequency converter by voltage reduction and A / D conversion optical fiber transmission. Because the DC bus voltage of frequency converter is high, which brings great danger to detection and maintenance, the DC sampling scheme greatly solves this problem, and highlights photoelectric isolation through appropriate circuit design. The problem of isolation between high voltage area and low voltage area of frequency converter is solved, and the accuracy of sampling and the safety of maintenance personnel are guaranteed.
Blind Dereverberation Wideband Multi-Source 2-D DOA Estimation Method Based on Single Channel Nonnegative Matrix Factorization
Authors: he Pengju , Qi Mi , Yu Zijiang , Fu Qiang , Tang Mengyang 
Published: November 2019

Abstract
There are many algorithms for DOA estimation based on blind source separation (BSS), which assumes that each sensor perceives a linear instantaneous mixed narrowband signal with known number of sources in noise-free or low noise environments. However, in practical applications, the number of mixed signal sources is unknown, and the perceived signals are often acquired in strong noise and reverberant environments. This paper proposes a novel noise reduction single-channel nonnegative matrix factorization deconvolution (NRSNMFD) wideband multi-source 2-D DOA estimation algorithm. Firstly, LMS adaptive filtering is used to remove the noise of the observation signal. Secondly, the single channel observation signal is decomposed into multi-channel signals composed of multiple intrinsic mode functions (IMFs) by empirical mode decomposition (EMD). The number of signal sources is estimated and the determined signals are reconstructed. Thirdly, the dereverberation of the signals are realized by NMFD method. The GCC-PHAT method is used to estimate the delay of the signal source. Finally, signal source location is realized based on the delay. The simulation and actual test results show that the proposed algorithm can estimate 2-D DOA with high accuracy under noise and reverberation environment, providing a new method for engineering application.
Applying fractional order system to design coordinated control system in primary frequency and automatic generation control for large coal-fired units
Authors: Wang Li , Liu Guohua , Jie Qiliang , Li Zhiyong 
Published: November 2019

Abstract
The large coal-fired units should have the ability of primary frequency (PF) and automatic generation control (AGC) to meet the requirements of grid security. In this paper, coordinated control system (CCS) with fractional order control (FOC) is designed in PF and AGC for large coal-fired units. An implementation of fractional order PID (FOPID) controller in distributed control system (DCS) is proposed. The engineering application results show that the algorithm is easy to implement in engineering, which can overcome the large delay and inertia of the fuel system, and effectively improve the performance of PF and AGC.
Design of 100A High Stability Sampling Resistance
Authors: Ningzhao Luo , Feng Yang , Yao Zhang , Jiangyuan Qu 
Published: November 2019

Abstract
In this paper, multiple manganese-copper resistance wires are connected in parallel as the basic structure of the sampling resistor. The stability of the resistance wire is analysed when the conductor is connected in parallel and twisted, and the resistance wire of the sampling resistor is determined to be connected in a twisted manner to reduce the influence of interference on the measurement. Sampling resistance is annealed in a thermostat to release the internal stress of the stranded wire. Experiments show that the resistance has a stability of 7 ppm for 8 hours. The resistance is connected to a high stability constant current source for testing. The short-term stability of the constant current source is better than 10 ppm, which meets the design requirements.
Damage detection of multi- source excitation based on FBG sensor
Authors: Huang Li Cai Wei , Chi Xingqiang 
Published: November 2019

Abstract
The Vibration detection is one of the key technologies of structural reliability. Traditional detection methods mainly focus on the analysis under single excitation, while the actual engineering problems mostly present the resonance phenomenon of multi-source excitation. Therefore, in this paper, based on the characteristics of FBG sensor, the vibration response characteristics under multi-source excitation are studied, including theoretical simulation and experimental research under multi-source excitation. On this basis, the experimental system for damage detection is built and its results show that this method by multi-excitation detection is feasible and it is sensitive to crack damage.
Research on data consistency of LED based on temperature step stress acceleration test
Authors: Lin Jingdong , Zhao Yue , Ma Chenyu 
Published: November 2019

Abstract
At present, whether electronic equipment can maintain the reliability of modeling under different temperature conditions is an urgent problem to be solved. This paper studies LED under stepping temperature stress. Firstly, the luminous flux of LED method is established based on the Arrhenius temperature degradation path model. Secondly, the criterion of temperature step stress is determined., and then the MATLAB is used to select the distribution model which best fits the LED flux degradation trajectory. Finally, we check the consistency of the LED data, so as to realize the establishment of the LED flux degradation trajectory model. The result show that this model has high reliability and can calculate the normal life data of LED accurately.