bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Rain Classroom to College English Writing
Authors: Hanbin Zhang 
Published: April 2020

Abstract
The purpose of the study is to discuss the process of construct the writing teaching mode based on Rain Classroom and explore the effects of the writing teaching mode based on Rain Classroom on College English teaching. This paper concludes that the main links of the writing teaching mode based on Rain Classroom are: model text analysis, imitation exercise, practical writing, and mutual evaluation and revision. In addition, the writing teaching mode based on Rain Classroom has significant effect on improving college students’ English writing ability.
Discrete complex image method for periodic Green’s function
Authors: Li Lin , Zhao Xu 
Published: April 2020

Abstract
The electromagnetic scattering of periodic structure may be expressed by integral equation with periodic Green function as the core. The periodic Green’s function can be expressed as infinite sum in spectral domain. In order to avoid the numerical calculation of infinite sum, the discrete complex image method is proposed. By using the Generalized pencil-of-function method, the closed form can be obtained without any numerical integration. It can be expressed as one group of real sources and two groups of complex sources with complex amplitude and complex position. The accuracy of the method is demonstrated through numerical examples.
Identification of Tea Red Leaf Spot and Tea Red Scab Based on Hybrid Feature Optimization
Authors: Meng Shulin , Wang Shuguang , Zhou Tao , Shen Jiankun 
Published: April 2020

Abstract
Tea leaf diseases seriously affect the quality and the yield of tea. In order to determine whether the tea leaves are infected by diseases or any types of infection, technical support is essential for taking appropriate measures of disease control. Images of normal tea leaves, tea leaves infected with Tea Red Leaf Spot, and leaves infected with Tea Red Scab disease were studied. An identification algorithm for both of the tea leaf diseases based on hybrid feature optimization was proposed. First, the image features were extracted using the Histogram of Oriented Gradient and the Inception v3 model. Then, hybrid feature optimization processing was performed on two types of extracted features. Finally, the Gradient Boosting Decision Tree algorithm was used as the classifier for the identification of tea leaf diseases. Experiments demonstrate that the hybrid feature optimization algorithm reduces the image feature from 36, 068 to less than 150 dimensions while maintaining a high identification accuracy, which greatly reduces the complexity of the identification algorithm. At the same time, the identification accuracy of tea leaf diseases based on hybrid feature optimization algorithm were higher than 95%.
Fault-tolerant technology based on FPGA: A Research of LogiCORE™ IP Soft Error Mitigation Controller
Authors: Wu Jiang , Meng Xiankai , Zhang Nan 
Published: April 2020

Abstract
In a radiation environment, compared with ASIC and FPGA based on anti-fuse structure, SRAM FPGA is more susceptible to single particle effect, in particular, the effect of single-event upset (SEU). How to improve the equipment anti-single particle over conversion reliability has become a key problem to be considered in the design of SRAM FPGA system. Xilinx provides soft error mitigation SEM IP cores that perform SEU detection, correction, and classification. As part of the SEU detection function, the SEM IP core uses ICAP and ECC primitives for clock control and observing the CRC circuit reading back. As far as SEU correction is concerned, the IP core performs the necessity through the built-in ECC function and the operation to locate and correct SEU errors. For the SEU classification, the IP core uses the Xilinx-Essential-Bit technology further to improve system reliability. Through the in-depth analysis of SEM, in this paper, soft error mitigation SEM controller IP core of Xilinx was used to build a verification and test platform based on Zynq-7000 SoC ZC702 in order to simulate the influence of cosmic irradiation on SRAM FPGA. On the basis of completing the functional verification of SEM IP core, we also put forward some improvement ideas based on the experimental results.
Lower resources of spoken language understanding from voice to semantics
Authors: Hao Zhang , Cheng Guo LV 
Published: April 2020

Abstract
Spoken language understanding is traditionally designed as a pipeline consisting of multiple components. First, the speech signal is mapped into text through the automatic speech recognition module, and then the natural language understanding module converts the recognized text into structured data, such as domain, intention and slot value. Usually these modules are trained separately. End-to-end speech comprehension, on the other hand, derives structured data directly from speech through a single model. However, end-to-end spoken language understanding based on a large amount of training data is difficult to achieve in different fields and different groups of people. For this reason, we introduced end-to-end oral comprehension based on pre-training with low resources and combined it with capsule vector. The experimental results show that the oral comprehension of this model with low resources is robust under different data sets.
Establishing a Database of Competition between ISPs Based on Python Language
Authors: He Hanyue 
Published: April 2020

Abstract
Nowadays, we have entered the era of 5G. And the application of the Internet surrounds our daily life. People need to rely on broadband products provided by different Internet service providers (ISP) when they access the Internet. People often compare the speed and the cost of Internet access between different providers. However, monopolistic behavior in the industry is severe in some countries, which may result in users having to withstand higher network access prices and lower quality broadband products. Therefore, the competition between ISPs is a direct influencing factor for users to use the network. This article first highlights the importance of competition among ISPs. And secondly, choose the European authoritative website, crawl the data, and manipulate it at the first step. Finally, this paper summarizes the ISPs competition data sets that can be used for subsequent model analysis. The author will elaborate on the relationship between competition and flow price in subsequent paper.
Hybrid Energy Storage Control Method for Isolated Island AC Micro-grid Based on Consistency theory
Authors: Song Chao , Xu Zhichao 
Published: April 2020

Abstract
In the traditional hybrid energy storage control method of isolated island AC micro-grid, due to the difference between different types of hybrid energy storage in the hybrid energy storage system, the control stability is low. Therefore, a hybrid energy storage control method of isolated island AC micro-grid based on consistency theory is proposed. Based on the consistency theory, the voltage and SOC of the isolated island AC micro-grid hybrid energy storage system are subject to the consistency control. On this basis, the power of the hybrid energy storage system is subject to the consistency control. Thus, the research on the control method of the isolated island AC micro-grid hybrid energy storage based on the consistency theory is completed. The experimental results show that the proposed control method based on consistency theory has better control stability.
Research on four-dimension Bandpass DSSS Modulation
Authors: Jiafang Kang , Bo Hua , Peilin Zhong , Chuanhui Liu 
Published: April 2020

Abstract
Based on 2-dimension baseband DSSS modulation method and orthogonal frequency conversion theory, a four-dimensional band-pass DSSS modulation and demodulation system model based on a single pseudo-noise code is proposed. Then, the BER performance is analysed, and the hardware experiments based on software defined radio are conducted. Compared with 16QAM and 16PSK, when the BER is 10−6, the proposed method outperforms 16QAM and 16PSK by 4dB and 8dB respectively, hardware experiments show that the time domain characteristics, power spectrum and power bandwidth of RF signals are consistent with theoretical values. Works in this paper establish the technology foundation for future application.
Parameter Matching and Simulation Optimization Analysis of Electric Vehicle Power System
Authors: Wu Xianhuan 
Published: April 2020

Abstract
With the development of new energy electric vehicle technology, its application is more and more popular, not only in the field of passenger cars, but also in the field of commercial vehicles. Based on this, this paper first analyzes the matching of electric vehicle dynamics and electric drive system, secondly, carries out the matching and design of electric vehicle power system parameters, and finally optimizes and simulates the power system.
A Tunable Filter with Different Kinds of Material for Good Electrical Performance
Authors: Zhou Chang , Xia Jing , Jin Wanwan , Wang Li , Liu Gang , Wang Nan 
Published: April 2020

Abstract
A tunable comb-line filter based on series of material with different conductivity is presented and optimized to achieve proper insertion loss and bandwidth. The coupled circuit technique is used and the varactor diode parallel resonance is employed to meet the requirement for external voltage control. Based on the analysis of the tunable filter, the influence of the material with different conductivity on insertion loss and bandwidth is analyzed and it is found that the material of the resonant rib in the filter is an important factor for the electrical characters and high conductivity can effectively restrict the insertion loss and realize the narrow bandwidth. The results also show that the narrow bandwidth could not be obtained when the conductivity of the material is too low.
Research on Verification Error of Smart Electricity Meter based on Regression Analysis
Authors: Dai Yanjie , Xu Ding , Wang Qing , Zhu Jingyuan , Wang Tingting , Liu Yanxi 
Published: April 2020

Abstract
In this paper, the errors of smart electricity meterare verified by using walk-in temperature and humidity box.First of all, this paper investigates the regression analysis method and analyzes the influence of temperature and humidity on the error of the smart electricity meter.The stepwise regression method is selected to model the verification error and the verification conditions of the smart electricity meter and the verification device.Finally, the accuracy of modeling is evaluated.
Consider medium and long-term electricity market different supply and demand than the sale of electricity price simulation method and system design
Authors: Pincheng Zhang , Yanmin Guo , Fen Lin , Shuhai Feng , Jinquan Zhao 
Published: April 2020

Abstract
After a new round open of electricity sales market, a large number of new sell electricity company involved in the sale of electricity market. Which leads to market instability. Because hair, sale members on both sides of the market in the electric power business behaviour real-time change. So only through the analysis of theory and can’t get the real power market operation state. Based on the analysis of electric power market supply and demand ratio, power suppliers and electric power company in different than the market price of supply and demand, set up to simulate long-term market members under supply and demand than bidding decision-making model, the application of RE - Learning, reinforcement Learning algorithm in 10 power suppliers and 30 sell electricity companies bidding behaviour simulation market under the participation of members. The experimental results show that the use of bidding decision model is a good way to express market members under different supply and demand than market clearing. Which verifies the effectiveness of the proposed method.
Application of Distribution Network Current Differential Protection Based on Ubiquitous Internet of Things in Line Selection and Location of Small Current Grounding System
Authors: Yin Weibing , Feng Chaoli , Shi Jianli , Lu Jianqin , Wang Lei 
Published: April 2020

Abstract
In order to find the fault point of one-phase grounding in distribution network as soon as possible and prevent instantaneous fault from developing into permanent fault or inter-phase short circuit, Tongxiang Electric Power Company of Jiaxing, Zhejiang Province adopts neutral point flexible grounding system, which solves the difficulty of fault location and avoids the malpractice of frequent tripping of the system. Based on the communication mode of power wireless private network, the feasibility of implementing fast differential protection in distribution network by using improved mutation algorithm is analyzed through MATLAB simulation. Under the influence of overhead line, cable line, the first or the end of line and transition resistance in flexible grounding system, differential protection can effectively reduce the extension of fault range, improved the relay protection level of distribution electric network to meet the reliability requirements of power supply system.
Analysis of Heating Fault of Pad Mounted Transformer Core in Wind Farm
Authors: Liu Shoubao , Yang Yaowu , Xiong Zhonghao 
Published: April 2020

Abstract
The Pad mounted Transformer is an important equipment for energy transfer in wind farm. Aiming at three cases of pad mounted transformer core heating faults occurring continuously in a wind farm, oil analysis and disintegration of the fault transformer are carried out, and the fault points causing the heating are found. In order to analyse the mechanism of the fault, the eddy current field analysis model is established by using finite element analysis software ANSYS MAXWELL to analyse the change. Quantitative calculation is carried out for the heating condition of the winding and core of the press. Through analysis, it is determined that there are defects in the manufacturing process of pad mounted transformer, and the reason of heating failure is that the low-voltage winding at the head contacts too closely with the iron core.
Identification of Power Quality Disturbances Based on Sample Entropy and Weighted Optimization Random Forest
Authors: Liao Xiaohui , Chen Chuanchuan , Wang Yuhan , Cui Mingjian , Liu Chuan 
Published: April 2020

Abstract
With the increasing number of non-linear loads and impact loads in the actual power grid, power quality problems are becoming more and more serious. Accurate and rapid identification of power quality disturbance signals is of great significance for improving the power quality and ensuring stable operation of the power grid. For this reason, this paper proposes a multi-resolution analysis of wavelet transform and a combination of sample entropy to extract the characteristics of power quality disturbance signals. The classification effect is better than the initial samples. The weighted optimization random forest classifier is used to classify the features, which reduces the error caused by the mode voting method of the random forest. The simulation and actual test results show that the power quality disturbances detection algorithm based on sample entropy and weighted optimization random forest has better classification accuracy than the decision tree, extreme random tree and traditional random forest.
Design and Optimization of Detection Antenna for Corona Discharge in High-voltage Transmission Lines
Authors: Xiao Xiaoming , Hu Weinan , Ran Jun , Xu Zheng , Hei Guoyu , Han Xintong , Zhao Lipeng 
Published: April 2020

Abstract
Corona discharge on high-voltage transmission lines is a common phenomenon in power systems. It results from poor contact between insulators and lines, and broken strands on transmission lines. Long-term corona discharges may lead to more serious power grids accidents. Hence, it is of great importance to effectively detect the occurrence of corona discharge. The Hilbert Fractal Antenna is a wide-band, small-sized antenna which can be carried by the unmanned aerial vehicle for close-range detection and accurately position fault points of corona discharge. In this paper, the finite element method is used to study the 5th order Hilbert fractal antenna. The research focuses on the different feeding positions of the antenna. By studying the different feeding positions of the antenna, we determine a miniaturized antenna which can be used for corona discharge detection of high-voltage transmission lines.
Application of high frequency chain transformer in aviation power supply
Authors: Shuang Wang Xiao , Zhao Jing , Gang Yang Xiao , Ren Shuai , Yan Wang Ning , Hui Xue Yin , Zhang Lu YA 
Published: April 2020

Abstract
This paper introduces the application of the high frequency chain transformer in the aviation power supply. The soft switch technology is used to reduce the electromagnetic interference of the converter, solve the power supply problem of the rotating circuit which has no physical contact with the static power supply, and extend the service life and reliability of the aviation power supply. Experiments show that the non-contact rotary high frequency chain transformer can completely replace the brush and slip ring in the power supply situation of the rotating mechanism, which has high application value.
Analysis of Self-priming Performance of Hydraulic Pump
Authors: Zhiyin Han , Yanfang Li , Huijun Wu 
Published: April 2020

Abstract
This article analyzes the self-priming performance of hydraulic pumps in hydraulic systemsanddescribes many factors affecting the poor self-priming performance of hydraulic pumps in hydraulic systems.All these factors are analyzed one by one and some effective solutions are proposed.
Design of eye electroacupuncture massage instrument based on 3D printing technology
Authors: Wei Xiuguo 
Published: April 2020

Abstract
At present, the common eye massage instruments in the market is mainly used to relieve eye fatigue and cannot treat myopia. Traditional Chinese medicine electro-acupuncture has a good effect on the treatment of myopia, but its efficiency is low, and most adolescents have poor compliance, which is difficult to promote. This design combines electroacupuncture therapy with 3D printing technology to accurately locate the eye acupoints through three-dimensional scanning, therefore the massage effect is better. The design of the massage instrument not only fills the field blank of the electro-acupuncture massage instrument for myopia, but also is more easilyaccepted by the adolescents, meanwhile, it has the advantages of good effect and easy promotion.
Electromagnetic interference characteristics during switching operation in power distribution network
Authors: Chengliang Wang , Weilian Shui , Qingsheng Yang , Yan Ning 
Published: April 2020

Abstract
The disturbance problem caused by the transient electromagnetic field during high-voltage switching operation is the most typical. Electromagnetic interference can be coupled to the secondary circuit in a conductive and radiating manner, then, affects the reliability of the secondary-side circuit. The key to the simulation calculation of the operating switch overvoltage is the judgment and simulation of its opening and closing conditions. The arc current zero-crossing judgment signal, the arc extinguishing and reignition judgment signals are fused, and a control signal is recursively obtained for switching operation. By analyzing the transient process during switch operation, a simplified model for isolating and closing the no-load bus, an overvoltage calculation model, and a fast transient model for overvoltage time-frequency signals are established. The characteristics of the transient electromagnetic field generated when the no-load bus and the circuit breaker of the disconnector are charged to the no-load transformer are simulated. The mechanism of fast transient pulse group generated by switching operation is obtained. The maximum overvoltage amplitude generated during the disconnector’s switching, and the no-load bus is obtained by simulation. Comparing with the measured data, the laws of electromagnetic interference characteristics during switching operation in power distribution network are verified.
Principal Component Analysis of Short-term Electric Load Forecast Data Based on Grey Forecast
Authors: Yinsheng Su , Chunxiao Liu , Bao Li , Weisi Deng , Peishen Zhang 
Published: April 2020

Abstract
With the large-scale development of the power industry, new requirements are put forward for the stable operation of the power system. Power system load forecasting refers to the use of historical load data to predict the future load value, which is an important part of energy management system. The short-term load forecasting process is often combined with the basic mechanism of power grid dispatching to achieve the balance of power grid supply and demand, reflecting the highly nonlinear computing ability. Power load forecasting is the premise of power grid real-time control, operation planning and development planning. At present, the grey model model used for power system load forecasting generally has the problems of large calculation amount, no mature theoretical basis for selecting structures and parameters, etc. This paper discusses the application of grey model in short-term power load forecasting, and puts forward a principal component analysis method suitable for ordinary daily power load forecasting data, which improves the accuracy of short-term power load forecasting.
Design and Implementation of Subsynchronous Damping Controller for HVDC
Authors: Wenpei Zhu , Aimin An , Yifan Xu , Yingyin Zhao 
Published: April 2020

Abstract
The interaction between High Voltage Direct Current (HVDC) transmission lines and turbogenerator units will cause the damage of the generator shafting and the electrical system by exchanging energy at one or more lower synchronous frequencies, resulting in the damage or even breakage of the generator shafting, seriously affecting the safe operation of the power system. To solve this problem, the Supplementary Subsynchronous Damping Controller (SSDC) is an effective method to suppress the secondary synchronous oscillation of turbogenerator units connected to rectifier side caused by HVDC. This paper combines the first standard model parameters of IEEE subsynchronous oscillation with CIGRE HVDC transmission system, and builds a HVDC transmission test system for Subsynchronous Oscillations(SSO) research in PSCAD. Based on signal test method, a narrow band SSDC is designed, and the damping in each synchronization frequency band is greatly increased. When the proportional coefficient is appropriate, the electrical damping is positive. The effectiveness of the designed SSDC is also verified by time domain simulation.
The Design and Simulation Analysis of Distribution Network Stripper Structure
Authors: Yu Yan , Zhou Zhanfan , Liu Weidong , Hu Shichao , Xu Xianjin 
Published: April 2020

Abstract
Considering the low efficiency of the stripping process and the serious damage of the core in the current distribution network, we propose a novel wire stripper in this paper. The kinematics modelling of the main transmission components in the wire stripper is established, and the opening and closing process of the wire stripper in real working condition is analysed by the kinematics and dynamics simulation. Furthermore, the static strength analysis and the stress distribution are obtained by the ANSYS, which provides theoretical guidance in the optimized design process. The results of motion modelling and static simulation confirm that the structural design of the novel wire stripper is reasonable and feasible.