bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Online Dynamic Social Network Evolution Community Discovery Method
Authors: Hu Zhangrong 
Published: October 2020

Abstract
Online social network in the study, dynamic implicit community or group structure of discovery and detection is a very key question at the heart of evolution, it is in the medium (Mesoscopic) view to observe the online social network hidden structure characteristic, predict the evolution trend, control of the situation, found that network abnormal mass incidents, etc. It is of great significance. The purpose of this paper is to provide technical advice for community discovery research by studying online dynamic social network evolution community discovery methods. This paper analyzes the characteristics of local clustering coefficient and node similarity calculation in unsigned network, and proposes the extended local clustering coefficient as the structural attribute of the edge in unsigned network. This property can better reflect the characteristics of local network density and network structure. Combining the new edge structure measure with the label propagation algorithm with linear time complexity, a label propagation algorithm combining the extended local clustering coefficient is proposed. The results showed that the accuracy of community discovery was improved by 32.6 percent in dynamic social networks.
Research on Assistant Diagnosis of Fundus Retinopathy Based on Deep Learning
Authors: Li Haoyu , Yuan Ziwen , Zhang Kun 
Published: October 2020

Abstract
Macular edema has three types of lesions: REA, PED and SRF. Early detection of edema areas can play a key role in the treatment of diseases. Neural network is a powerful tool for image processing in medical field. Deep learning automatically finds features that are ideal for “AI+Medical Imaging” diagnostics. This paper mainly proposes a new method of neural network that includes Object recognition and classification to improve the accuracy and speed of detection of macular edema area. The method is offered to be evaluated and compared to the traditional network method. The results indicate that the method applied reducing the over segmentation effect and getting a more accurate result of the option than traditional network method
Analysis of influencing factors of hospitalization cost based on BP neural network model*
Authors: Xia Hongwei , Chen Chaoqun 
Published: October 2020

Abstract
In view of the present social status quo, “cost of medical care”, according to a national disease surveillance center of 2700 medical record sample data, using BP neural network method, through SPSS software operation, get in 26 factors affecting hospitalization cost, age, level of hospital, hospital source code, disease types, cost the importance of the five factors relative to the highest, and the accuracy rate of more than 85%, so as to provide basis for government decision-making departments to formulate corresponding health policy.
Proof the Positive Definiteness for the Jaccard Index Matrix Based on Fuzzy Sets
Authors: Sun Linge , Song Yafei , Lei Lei 
Published: October 2020

Abstract
This paper addresses the proof process of the positive definiteness property for the Jaccard index matrix, which is applied to define a metric distance measure between belief functions. Our proof is implemented in the framework of fuzzy sets. Based on the decomposition theorem of Jaccard index matrix proposed by M. Bouchard et al, and the transformation between crisp sets and fuzzy sets, the positive definiteness of the Jaccard index matrix can be proved in a concise way.
Design of Torque Standard Device for Extreme Environment
Authors: Bo Tao , Qi Feng , Liu Xiufang , Hu Jiacheng , Yin Jianlong , Li Dongsheng 
Published: October 2020

Abstract
A torque standard device suitable for extreme environment is designed. The standard device transmits the torque value of calibrated torque sensor in extreme environment to normal temperature environment through torque transmission shaft to realize the calibration function. The mechanical design of the shaft of the device is carried out, and the error sources of the calibration device are analyzed, and the error distribution is carried out according to the technical indicators of the standard device. The calculation results show that the maximum allowable error of the standard device is 0.7Nm, which meets the calibration accuracy requirements of the extreme torque standard device.
Research And Practice Of 600MW Subcritical Steam Turbine Inter Generation Upgrading
Authors: Shengxiang Jin , Liuhu Wang , Jinsong Zhang , Qi Zhang , Qianyu li , Wei Bai , Chuan He , Yong Zhou , Daming li , Yu Xiao 
Published: October 2020

Abstract
This paper introduces the upgrading technical scheme and application of subcritical 600 MW steam turbine. Firstly, the performance and existing problems of 600 MW subcritical unit before modification are analyzed, and the performance and output of steam turbine before modification are determined. Secondly, the performance of 300MW subcritical steam turbine retrofit and the performance guarantee value of each retrofit manufacturer are studied, and the thermal calculation is carried out. At the same time, the performance index of subcritical 600 MW steam turbine after upgrading is analyzed. Finally, according to the channel reconstruction scheme provided by the manufacturer, the optimization design of cold end optimization, last stage blade selection and base foundation reconstruction is proposed.
Research on Operation Stability of Standard Orifice Plate in Nuclear Power Plant KME System
Authors: Yin Yelei , Xia Ming , Wang Xiaolong , Yang Zhe 
Published: October 2020

Abstract
In order to promote the power stability of nuclear power units, the KME thermal balance principle is used to further analyze the factors affecting the flow of the standard orifice plate of the nuclear power plant KME system (Test Instrumentation). The high-accuracy three-coordinate measuring machine is used to detect the arc radius of the entrance edge of the standard orifice plate and the inner diameter of the standard orifice plate. Analysis the operation history data of the standard orifice plate of the nuclear power plant KME system. Study the running radius of the entrance edge of the same orifice plate and the inner diameter of the standard orifice plate under different operating units. Obtain the influence of the arc radius of the entrance edge of the standard orifice plate and the inner diameter of the standard orifice plate of different types of units.
RETRACTED: Research on Electrical Characteristics of Mixed Media Based on Computer Simulation Technology
Authors: Aorigele  
Published: October 2020

Abstract
Computer technology is mainly used to study the electrical characteristics of mixed media through calculation and analysis of its equivalent dielectric constant. Since the geometric distribution, content, and structural shape characteristics of different phases in the mixed media will affect the equivalent dielectric constant to varying degrees, we need to analyze the relevant factors. However, when analyzing the relationship between the geometric distribution characteristics of each phase and the equivalent permittivity in a mixed medium, the traditional hybrid formula analysis method cannot meet the actual needs of complex equivalent equivalent permittivity research. Therefore, we must adopt computer simulation technology and use relevant simulation software to realize the conversion between geometric distribution and correction factor. In addition, we can also modify the mixing formula through the porosity function to accurately understand the electrical properties of the mixed medium.
Common fault Analysis and Countermeasures of key Components of intelligent electricity meter
Authors: Chen Zhiru 
Published: October 2020

Abstract
In recent years, with the State Grid Corporation's vigorous construction of smart grids, smart meters have been rapidly promoted in the power system. After several years of online operation, the operating reliability of smart meters has also stabilized. However, in the process of widespread use of smart electric energy meters, the quality problems of clock chips, batteries and other components have also been exposed. This article takes the component failures encountered in the detection and operation of the smart electric energy meter as an example, analyzes the causes of the failures based on the four typical abnormal phenomena, and then conducts the opening detection for the above reasons and determines the nature of the failure based on the test conclusions. Finally, a corresponding fault management platform is established through the collection of electric energy meter fault data, which realizes all-round management and control of the fault handling process and selection of the qualifications of smart meter suppliers, thereby ensuring the quality of components and improving the operation of smart electric meters reliability.
Rational Analysis of Self-Alignment Force of Reactive Additive Monomer with Multiple Methods
Authors: Zhang Yu 
Published: October 2020

Abstract
Analysis self-alignment force (SAF) of reactive self-assambly additive monomer is highly valuable in self-alignment vertical alignment mode(SAVA), because this force directly influences performance of optoelectronics device. In this work, SAF has been studied by multiple methods, such as atomic force microscopy, mueller matrix imaging polarimeter. Reactive additive monomer and LC molecular were immobilized on the surface of an AFM probe and ITO, respectively. Due to the complexity of the additive monomer-hydroxy, additive monomer-LC moluclar interaction, parallel experiments were designed to discriminate specific interactions. The difference of pretilt angle between TFT side and CF side also reveals the difference of SAF at various structure cell.The additive with strong SAF showed well alignment state after forming into optoelectronice device.
Mechanical modeling and analysis of V-shaped LUM mechanical drift
Authors: Geng Ranran , liang Chenguang , Yao Zhiyuan , Huang Jiacai 
Published: October 2020

Abstract
The flexible clamping component is used to support the stator of linear ultrasonic motors (LUM). It distinctly improves the vibration characteristics of the motor and simplifies the structure, nevertheless brings the mechanical drift phenomenon. In order to improve the positional accuracy and structural stability of the V-shaped LUM, this paper studies the mechanical drift mechanism of the LUM with clamping component. Mechanical model of the motor with flexible clamp which occur mechanical drift is established, and the mechanism as well as control methods are analyzed. Based on the model, the mechanical drift experiments of clamping components with different stiffness are carried out. The experimental results show that the mechanical drift is obvious when the stiffness of the two flexible clamps are different, while the mechanical drift hardly occur when using the clamping components with tremendous tangential stiffness. Therefore, a kind of straight beam clamping LUM is proposed. The research indicate that the new motor has little mechanical drift, better running performance and higher structural stability, which can be used in the precision positioning of the mechanical devices.
Study on structural strength of paver screed based on finite element method
Authors: Jia Jie , Liang Yanbin , Wan Yipin 
Published: October 2020

Abstract
In order to ensure the rationality of screed structure design and reliability of structure strength, the structural finite element model of paver screed was established with the aid of APDL language. The static and dynamic characteristics of the screed are analysed based on the finite element method. Results show that maximum principal stress of screed in the bar is 113Mpa, maximum deformation is 1.82mm, the screed meets the normal demand both in intensity and rigidity. Natural frequencies and according vibration model of screed were obtained from finite element modal analysis, the first-order natural frequency in a vibrator adjustable frequency range, so working frequency should avoid the first-order natural frequency, and the change rule of strain and stress amplitudes of screed with the vibration frequency was obtained from harmonic response analysis. The structural static and dynamic analysis of screed provides the basis for the structure design and the adjustment of construction parameters.
Analysis of Abnormal Low-voltage Line Loss in the Transformer Area Caused by Distributed Photovoltaic Access
Authors: Qiao Kai , Zhang Guomin , Liu Ningchao , Man Hongwei 
Published: October 2020

Abstract
This paper analyzes the problem of abnormal low-voltage line loss in the transformer area caused by distributed photovoltaic access. First, it summarizes the solutions of distributed photovoltaic access to the transformer area through low-voltage, studies the calculation method of the current low-voltage line loss in the transformer area and then analyzes the reasons of the abnormal line loss caused by distributed photovoltaic access in both technology and management, finally, the countermeasures are given in the conclusion.
The Attitude Measurement of Horizontal Directional Drilling Equipment Based on Quaternion and Extended Kalman Filtering Method
Authors: Shi Tiantian , Wu Jian , Hu Yu , Ding Lei 
Published: October 2020

Abstract
For the attitude measurement of drilling tool in horizontal directional drilling, a new method for attitude measurement system based on quaternion and extended Kalman filter (EKF) is presented. The attitude measurement system consists of three-axis accelerometer and three-axis gyroscope. Based on the data information obtained by the inertial sensor, the attitude angle of the drilling tool can be calculated. To limit the errors of angle measurement, this research combines the errors of the sensors and the measurement noise and uses EKF method to obtain three angles. Three angles consist of pitch angle, roll angle, drilling angle. The proposed method was tested by two experiments. Results showed that this method could limit the error of drilling tool attitude measurement and reduce the impact of environmental noise on the measurement.
A Detection and Identification Method Based on CNN for Laser Point Thermal Radiation
Authors: Yang Haichuan , Xie Ruidong , Yi Yingmin 
Published: October 2020

Abstract
Aiming at the high demands of temperature and precision in the aspect of additive manufacturing, a method based on CNN was proposed for estimating measurement. The network was trained through the collected laser thermal radiation images for image recognition and isotherm estimation after modeling a CNN. The experimental conclusion verifies that the isotherm detection and temperature estimation of the laser point can be efficiently implemented in proposed method.
Structural design and analysis of a one-way drive clutch for printers
Authors: Liu Pingping , Wen Guang , Zuo Fangjun , Deng Xingyue 
Published: October 2020

Abstract
Based on the application background of the paper reversing function of a duplex printer, a clutch which can realize one-way transmission is designed. The driving gear and driven gear are dynamically connected by a connector with wedge teeth and spiral slope. When the motor rotates forward, the clutch can normally output power to the load, and when the motor reverses, the power is cut off, and the load cannot rotate. The clutch can not only realize the paper reversing function, but also make the load not rotate with the reverse of the motor, so as to protect the toner cartridge and heating roller. The clutch has the advantages of few parts, low cost, convenient installation, compact structure and low noise after assembly. In addition, on the basis of the structural design, the necessary mechanical properties of the clutch are analyzed to provide theoretical support for structural improvement.
Dynamic characteristics and influencing factors of azimuth axis of a new antenna pedestal
Authors: Guang WEN , Ming CHENG , Xianchun TANG , Xinhui JIANG , Xuerong ZHANG 
Published: October 2020

Abstract
Based on the finite element method, the dynamic characteristics of the azimuth axis of an antenna pedestal were studied. With the help of modal analysis module of finite element software, the modal natural frequency and modal shape of the structure were obtained, and the influence of structural size parameters on its dynamic characteristics was also investigated. Through the research, it can be concluded that the first six natural frequency values of the azimuth axis are 220.21, 220.24, 1178.2, 1519.9, 1531.3, 1531.3 Hz. And the first six modes are shown as follows: the first and second order is the swing mode of the axis, the third order is the up and down stretching mode of the azimuth axis, the fourth order is the torsional vibration mode of the azimuth axis, and the fifth and sixth order are the first bending vibration mode of the azimuth axis. The first and second order natural frequencies of the axis decrease with the increase of size parameters d2
, l1
and l2
, and increase with the increase of size parameters d1
, d3
and d4
. The analysis results provide a theoretical basis for the optimization of the dynamic performance of the azimuth axis.
Design and test of bullet shell counter
Authors: Yaxin ZHANG , Hua XU , Renggui LIU , Wanmin LI 
Published: October 2020

Abstract
In order to solve the problem of counting when the bullet shells is recovered, two different types of bullet shells counters are designed. Through theoretical analysis, the size of the slot in the slot type bullet shell counter is determined, and the best times of abrupt reverse of the slide mechanism in the chute type shell counter is determined through experiments. The comparison test of two kinds of bullet shell counter shows that: The ejection efficiency of the chute type bullet shell counter is 317.5 pieces / minute, and the counting accuracy is 99.00%; the counting efficiency of the slot type bullet shell counter is 113.2 pieces / minute, and the counting accuracy is 99.75%.The chute type bullet shell counter is suitable for high-efficiency counting when large-scale bullet shell is recycled, and the slot type bullet shell counter is suitable for small-scale accurate counting. Both kinds of bullet shell counters meet the requirements of automatic shell counting put forward by the army.
Analysis of frost resistance of basalt fiber cement solidified aeolian sand subgrade
Authors: Yan Jingchen , Ma Yanpei , Zhang Xin , Yan Junjie 
Published: October 2020

Abstract
Through the freeze-thaw cycle test, the damage characteristics of basalt fiber cement solidified aeolian sand with different basalt fiber and cement content, different freeze-thaw cycles and curing age were analyzed. The test results show that with the increase of the basalt fiber content, the damage degree of the basalt fiber cement solidified aeolian sand under the action of freeze-thaw cycle first decreases and then increases, and the damage degree is minimum when the basalt fiber content is 0.5%; The 90-day-old specimens were more resistant to freeze-thaw damage than the 28-day specimens. By establishing the damage model of unconfined compressive strength loss rate and freezing and thawing times of basalt fiber-solidified aeolian sand, it was found that it obeyed the quadratic polynomial change trend, and the fitting accuracy was greater than 0.9. The gray entropy analysis method was used to find that the amount of cement had the greatest influence on the mass loss rate and unconfined compressive strength of basalt fiber-solidified aeolian sand specimens.
Adversity quotient and logical thinking skills of prospective primary school teachers
Authors: Ristiana M G , Istianah E , Pratama D F 
Published: October 2020

Abstract
A teacher should have a good teaching skill for making a better generation later. Based on researcher questionnaire before this research, teacher in school still haven’t teach a real concept to their students. Therefore, to prevent this phenomenon they need a good teaching strategy. Logical thinking skills and adversity quotient are the important things that they need to make the strategy. The aim of this research is to analyse prospective primary school teachers’ logical thinking skills and adversity quotient. In order to do so, we set up a qualitative descriptive method with 40 students as participant. Test of logical thinking skills about mathematics, questionnaire and interview given to them. The results showed that there are 15% of climber category, 72.5% of camper category and 12.5% of quitter category. The logical thinking skills of the students following their adversity quotient, the students that in climber category have a very good logical thinking skills, in camper category have good logical thinking skills, and in quitter category have a bad logical thinking skill. Based on the results, we concluded that prospective primary school teachers still in camper category and have a good logical thinking skill.
The relationship between self regulated learning and mathematical creative thinking ability
Authors: Runisah  , Gunadi F , Ismunandar D 
Published: October 2020

Abstract
This study aimed to analyze the relationship between students’ Self Regulated Learning (SRL) and Mathematical Creative Thinking Ability (MCTA). A quasi experimental was applied in this research. The sample consisted of 173 eighth grade students taken from high and medium level schools in Indramayu, West Java province, Indonesia. The sample was divided into three groups with three different learning models. One group used the 5E Learning Cycle model with metacognitive techniques (LCM), and the other two groups each used the 5E Learning Cycle (LC) and Conventional Learning (CL) models. The data were collected through test of MCTA and SRL scale. The results of the study concluded that there is a significant positive correlation between SRL and MCTA. There is a strong correlation between students’ SRL and MCTA in group with the LCM model, meanwhile in groups, with LC and CL model the correlation in the medium level.
Increasing primary school students’ reasoning ability on the topic of plane geometry by using hawgent dynamic mathematics software
Authors: Chotimah S , Wijaya T T , Aprianti E , Akbar P , Bernard M 
Published: October 2020

AbstractPlane geometry is one of the topics taught in middle school that is difficult to understand. Mostly, teachers use the traditional teaching method when explaining this concept which is why most students only memorize the formula for plane geometry without knowing how the formula is formed. These factors affect students’ reasoning ability. According to the information above, there are two main purposes of this research. The first purpose is to know how significant is the effect of Hawgent dynamic mathematics software on primary school students’ reasoning ability and the second purpose is to compare primary school students’ reasoning ability between the experimental and controlled classes. The sample of this research is 30 5th grade students in one of the primary schools in Cimahi city, Indonesia in the year of 2019/2020. The data collection will be done by using the pre-test and post-test to compare the primary school students’ reasoning ability in the experimental and controlled class. The data will be processed by using SPPS 16 and Microsoft excel. The result of this research is that there is an effect in students’ reasoning when using Hawgent dynamic mathematics software as a learning media and comparing the reasoning ability of the controlled and experimental class on the topic of plane geometry.