bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Extrusion die for parallel collection Al flat tube of automobile heat exchanger
Authors: Deng Rurong , Huang Xuemei 
Published: June 2019

Abstract
The structural characteristics of parallel tube aluminum flat tube profiles for automotive heat exchangers were analyzed. A new die structure is present, and a semi integral core structure is proposed. The selection of new die structure parameters is introduced, which included the selection of extrusion machine capacity, the layout of hollow holes, the structure of the cores, the size of guiding holes, the structure of the welding chamber and the bearing of cores and the die hole etc. The practice shows that the new structure can effectively prevent the premature fracture of the cores and greatly improve the service life of the die.
Eye state recognition method for drivers with glasses
Authors: Geng Lei , Yin Haibing , Xiao Zhitao , Xi Jiangtao 
Published: June 2019

Abstract
Eye state recognition is a key step in fatigue detection method. However, factors such as occlusion of different types of glasses and changes in lighting conditions may have some impact on eye state recognition. In order to solve these problems, a driver’s eye state recognition method based on deep learning is proposed. Firstly, the driver’s face images are acquired using an infrared acquisition device. Secondly the multi-task cascaded convolution neural networks are used to detect the face bounding box and feature points of the driver’s face image, and then the eye regions are extracted. Finally the Convolution Neural Network (CNN) is adopted to identify the open and closed state of the eyes. Experimental result shows that the proposed method can accurately identify the state of eyes and help to calculate the fatigue parameters of drivers.
Curing characteristics of bismaleimide/furan blends
Authors: Shi Zhen , Li Peng , Zhao Guizhe , Du Ruikui 
Published: June 2019

Abstract
The curing kinetics of the bismaleimiede/furan blending system is studied by differential scanning calorimetry (DSC) under dynamic conditions. When the content of bismaleimiede is 25wt%, the curing process parameters of the blending system are obtained by the extrapolation method of temperature-heat rate (T-β), that is, the gelation temperature, curing temperature and post-treatment temperature, thus providing a theoretical basis for the curing process of the system. The kinetic parameters of the system are calculated by using Kissinger equation and Crane equation, that is, apparent activation energy (Ea), apparent frequency factor (A) and reaction order (n), and then the curing kinetic model of the system is established according to the calculated kinetic parameters. The kinetic model is used to predict the curing reaction characteristics of the system under the same temperature and dynamic conditions.
Research Progress on Malignant Transformation Mechanism of Precancerous Diseases of Breast Cancer
Authors: Xia Dong , Ran Rui , Bobo Meng , Yan Fang , Yanfang Pan , Hong Li , Xiaoping Ying 
Published: June 2019

Abstract
Breast cancer occurs in the epithelial tissue of breast, which is one of the most common female cancers in the world. In recent years, with the improvement of people’s living standards, the incidence of breast cancer is also growing rapidly, so the prevention of breast cancer is very significant. At present, the etiology and pathogenesis of breast cancer are still unknown. Precancerous diseases are benign breast lesions with potential canceration, which may develop into breast cancer if they have not cured for a long time. This paper summarizes the latest research progress on the mechanism for malignant transformation of breast precancerous diseases in recent years, hoping to provide theoretical reference for basic research and early clinical diagnosis of breast cancer.
A Novel Effectiveness Inference Method of Communication Jamming Based on Combination Factors
Authors: Yunge Tang , Taotao Zhang , Li Li 
Published: June 2019

Abstract
This paper presents a method of communication jamming effectiveness based on jamming equipment, combat target and propagation environment, in order to solve the problem of limited external field test resources for comprehensive evaluation supportion. “Collect the real jamming signal and communication signal of typical test station environment, in order to simulate the jamming ability of jamming equipment under different propagation environment (terrain, object, meteorology), communication combination parameters (distance, power, modulation mode) and jammint combination parameters (power, bandwidth, type).”
Research and Application of Low Voltage Ride through (LVRT) and the Power Grid Adaptability Testing Device for Frequency Converter
Authors: Zaide Xu , Yang Liu , Jingmin Xu , Qi Xiao , Zhijie Zhu 
Published: June 2019

Abstract
In order to study the response characteristics of converters applied in the field of renewable power integration and motor speed regulation when grid fault appears, the traditional LVRT schemes and effects of converters are analyzed, and the integrated design of AC and DC sources scheme based on power electronics technology is proposed.The three-phase four-wire topology AC and DC sources and adaptive fuzzy PI control algorithm is adopted to realize the real-time adjustment of the DC output voltage and dynamic control of the three-phase or single-phase AC output voltage. Meanwhile, the dynamic control includes the drop amplitude, the drop time, the frequency, and the Harmonic. The 40KW LVRT and grid adaptability testing device for converter is developed. The laboratory test proved that the dynamic response time of the device is less than 5ms, the harmonic content of the AC output voltage is less than 1%, and the protection mechanism is complete and reliable. The upper computer sets parameters offline or online, tests circularly and operates conveniently.
Method and Research on Detecting Unknown Frequency Signal in Duffing Oscillator Detection Blind Zone
Authors: Huang Ji-yao , Chen Chang-xing , Ling Yun-fei , Lin Xiang-yang , Sun Hao-xiang 
Published: June 2019

Abstract
In view of the problem of blind area in detecting weak iso-frequency signals of Duffing oscillator, an anova technique is proposed to detect the signal in blind area.By analyzing the condition of detecting blind area, the range of phase of the signal to be measured with the same frequency is obtained, and the variance calculation of the chaotic system and the signal to be measured is realized.The feasibility of the method is proved by experiments.It can also detect the existence of difference frequency signal.The results show that this method is a signal processing method with a lower threshold of SNR, which provides a basis for weak signal detection.
Design and Research on FBMC-OQAM Multicarrier Technology for 5G
Authors: Yao Ling , Wang Enliang , Peng Xia 
Published: June 2019

Abstract
Aimed at the low frequency utilization of OFDM due to adding cyclic prefix, a FBMC-OQAM system design based on frequency sampling prototype filter is proposed. In this paper, the performance difference between FBMC-OQAM and OFDM is studied by building the system model and the effect of the overlap factor of the prototype filter on the performance of multi-carrier technology in FBMC-OQAM system is also studied. It is verified that the system has high frequency utilization and good out-band suppression ability and it has good application value in 5G system.
Non-uniform Illumination Image Enhancement Based on Retinex and Gamma Correction
Authors: Xia Haiying , Liu Min 
Published: June 2019

Abstract
Since ambient light or reflection from the surface of the object, the phenomena of none-uniform illumination exist in images.At present, some problems may appear in the image after the non-uniform illumination image processed by conventional algorithms, such as unnatural, the compressed dynamic range of brightness and halo artifacts in strong edge.To effectively process none-uniform images, the image enhancement based on Retinex theory and gamma correction was proposed.First, the bilateral filter is used to decompose the original image into an illumination and reflectance, to avoid halo artifacts in the reflectance.Second, Gamma correction and are used to equalize the dynamic range of brightness and extended brightness.Finally, the reflectance and the illumination are re-fused to restore the detail and naturalness of the image.The experimental results show that the proposed method effectively enhances the image and maintains the naturalness of the image.The objective evaluation index and computation time are also significantly better than other algorithms.
Research on domain terminology recognition based on dependency tree-conditional random field
Authors: Lin Yanyan , Lu Jieping 
Published: June 2019

Abstract
In view of the inconsistency of Chinese patent information in manual marking and classification, which leads to problems such as missed detection, partial detection and noise of patent search, this paper proposes a method based on the dependency tree-conditional random field(CRF) identification field terminology. The method is based on the modern grammar theory of dependency, using the existing technology to mark the dependency relationship. Finally, the corresponding technical feature words are identified in the results of the dependency labelling, and the training data is used as the training data to train the conditional random field model to identify the domain terminology. The experimental results show that the acquisition of training data through the dependency tree can improve the accuracy, recall and F value of the recognition results.
Adaptive context-aware correlation filter target tracking
Authors: Zhou Saijun , Zhang Chengwang , Xiong Xuying , He Ran , Qiu Jingang 
Published: June 2019

Abstract
Aiming at the problem that the traditional correlation filter target tracking algorithm has low tracking accuracy under the conditions of fast motion, occlusion and complex background, an adaptive context-aware correlation filter target tracking algorithm is proposed in this paper. On the basis of the relevant filtering algorithm, the boundary effect and fixed learning rate brought by cyclic displacement are improved as the main purpose. Firstly, an adaptive sampling strategy based on the extreme value of the response graph is added to the context information in the training stage of the classifier. Then, A piecewise learning rate adjustment strategy is utilized to make the algorithm better adapt to the target change. Finally, the performance of the algorithm is verified by the standard data set. The experimental results show that the proposed algorithm improves the tracking accuracy of DCF and SAMF algorithm respectively. It not only has good robustness in the case of fast motion, occlusion, complex background, etc., but also can be integrated into most relevant filtering algorithms as a framework.
A study on the presentation and influence of pan-anime culture in Chinese animated films
Authors: Liu Baiheng 
Published: June 2019

Abstract
Taking the influence of pan-anime process on the animation creation and animation industry in China as the research object, through the multi-angle analysis of the trend in the works in recent years by domestic animation creators, the study attempted to provide some advice for integrating pan-anime culture more naturally into the creation of the current domestic animation film and narrative mode and provide some help for catering to the preferences of pan-anime audience under the new pattern.
The research on multiuser resource allocation optimization in cognitive radio
Authors: Hu Guangyao , Zhang Luyong , Chen Dianjun 
Published: June 2019

Abstract
Spectrum resource allocation optimization is still a research hotspot in the field of cognitive radio. The optimization framework based on Bandwidth-Power Product (BPP) proposed in recent years provides a new direction for this field. Compared with the traditional waterfilling algorithm, the new optimization framework has effectively improved the utilization of spectrum resources. However, there are few further studies on BPP in recent years. Based on the work of predecessors, this paper improves the criterion of BPP by taking into account the impact of the multiplexing of spectrum resource in different spatial locations on the spectrum utilization. The simulation results show that the improved BPP framework can further improve the utilization of spectrum resource; besides, the framework is more in line with the actual cognitive radio environment.
Control Strategy of Central Air-conditioning Load Participate in Peak Adjustment
Authors: Hong Lin , Nate•saierjiang San 
Published: June 2019

Abstract
At present, the proportion of air-conditioning load on the user side is increasing, and the air-conditioning loads have the ability to store thermal energy. By reasonable controlling air-conditioning loads to participate in peak adjustment, the potential of air-conditioning load regulation can be effectively played. In this paper, a temperature control model of central air-conditioning loads is established based on the calculation method of building cooling load. Fully the periodic paused control strategy for central air-conditioning load is proposed to release the conflict between electricity supplying and demanding in the period of peak load, considering the heat storage and heat dissipation characteristics of buildings and the heat dissipation characteristics of changing flow rate of people, without affecting or less affecting the users comfort. Then, taking a business district as an example, the feasibility of temperature control model of central air-conditioning and the hierarchical strategies periodic paused control strategy is verified.
A Design of Road Lifting Blind Device and Finite Element Analysis
Authors: Li Y Q , Lv X C , Dai J 
Published: June 2019

Abstract
The visually impaired cannot identify the traffic signal lamp accurately in the existing road intersection, because there is no effective blind guidance system. In view of the problem, a new lifting blind device was designed in this paper, which contains device structure and control system. Three-dimensional modeling and stress situation of the device were analyzed through Solidworks, the results showed that the structure and material selection of the blind track lifting device could meet the requirements. Because the device is simple, reliable and efficient, it is conducive to popularize and applicate.
Research on LCL-filtered Grid-Connected Inverter Based on Fractional Order PI Controller
Authors: Yini Zhou , Hejin Xiong 
Published: June 2019

Abstract
With the high attention paid to new energy sources, grid-connected inverters with LCL filter have been widely used. In order to maintain the steady state operation of the system and reduce the resonance, the current double closed loop control decision with a PI controller is often adopted. However, the PI controller has only two adjustable parameters, Kp and Ki, and the adjustment accuracy is limited. This paper focuses on the simulation of the lightning interference and humid environment that inverters may face after being put into use in outdoor open space, such as solar power stations and so on. Since the fractional-order PI controller has three adjustable parameters, it can effectively improve the system performance and make the output more in line with the actual application requirements. Therefore, this paper selects the fractional-order PI controller and compares with the control performance of the traditional PI controller. Finally, the conclusion comes out that the system based on fractional order PI controller has stronger anti-interference ability and better robustness.
Design and Implementation of spacecraft component-level test management system
Authors: Zhang J , Zheng H M , Lu T , Guo W , Chen A R , Liu Y 
Published: June 2019

Abstract
This article is to introduce the typical performance and configuration of component-level environmental test management system. Firstly, the characteristic of spacecraft component-level environmental test is analyzed and the main problems are pointed out. In order to address the shortcomings, the project of the test management system has been envisaged. Then, the composition, structure and implementation method are described. Results show that the management system solves many problems after its application. The system has the function of key parameter monitoring and a timed automatic inspection. It reduces the strength of the workforce and improves the quality of process control. The data packs of the product are enriched too. This system unifies the device drivers and communication methods of multiple manufactures, and completes the whole process automatic control of mechanics, thermal and comprehensive environmental tests. The system adopts the idea of modular design and has the function of convenient expansion. It has been deployed in many laboratories and can be promoted to other industries in the future.
Research on Gearbox Fault Diagnosis Based on Vibration Signal Hilbert Demodulation
Authors: Li Dasheng , Ye Hongling , Li Yuqing 
Published: June 2019

Abstract
Gears are often prone to typical faults such as broken teeth, pitting, tooth surface wear and shaft bending in harsh environments. These faults not only have different failure modes, but also have different vibration signal characteristics. Vibration signal analysis method is one of the most effective and adaptable methods in gearbox fault diagnosis analysis method. Based on the analysis of gearbox failure mechanism, this paper verifies the typical fault diagnosis of gearbox based on Hilbert demodulation analysis through specific experiments, the application of which provides an important reference for accurate gearbox fault diagnosis.
A Mass Sensor Based on Two Complete Synchronized Optomechanical Oscillators
Authors: Jin Leisheng , Li Kaiwen , Fang Yuming 
Published: June 2019

Abstract
In this work, we study the realization of stable complete synchronization in two coupled optomechanical systems with a master-slave configuration. By taking the open-plus-close-loop method as coupling scheme, it is verified that the mechanical and optical mode in the coupled systems with parameters mismatched can be simultaneously synchronized both in linear and nonlinear regime, and even in chaotic state. Based on the achieved complete synchronization, the coupled systems are then explored in mass sensing applications. By taking one of the coupled as sensing part, we develop the coupled system setting in complete synchronization as a mass sensor. It is revealed that a tiny mass added on the sensing part will lead to desynchronization, and the quantities of added mass can be determined by calculating a designed similarity measure.
Construction of power loss equation for intelligent car based on maximum likelihood estimation
Authors: Zhu Ran , Yang Wei , Cao Shun-xia 
Published: June 2019

Abstract
Aiming at the integrated control system of intelligent car and shore control center, revolving around high frequency wireless transmission control, this paper introduces the concept of maximum likelihood estimation (MLE), and proposes a power loss equation construction method of the intelligent car based on frequency domain transformation. Proceeding from frequency domain model, the influence of the corresponding parameters on path loss performance of received power which reaches the intelligent car is simulated and analysed in this paper. From simulation results of the frequency domain model, when the incident angle, α, is 0.4π, the corresponding received power path loss to the intelligent car is minimized. The result reflects the smallest received power path loss to the intelligent car and the impact on the system performance.
Large-scale corn header design with adjustable line spacing and lifting cylinder motion simulation
Authors: Cao Zijian , Cao Shukun , Xu Xiangqian , Han Tao , Guo Hejia , Xu Shuqiang 
Published: June 2019

Abstract
Existing large corn harvester headers have inflexible walking, fixed line spacing, and cannot be well applied to the harvesting requirements of different line spacings.Based on the existing header, the header is designed to be foldable and the line spacing is adjustable.The dynamics analysis software ADAMS was used to simulate the hydraulic cylinder of the lifting header.The results show that under uniform load, the connection between the hydraulic cylinder and the vehicle body and the connection between the hydraulic push rod and the conveying bridge are large, and the lifting speed is positively correlated with the force. The offset load has an influence on the force of the motion pair and has the greatest influence on the force between the hydraulic push rod and the transport bridge. When the strength check is performed, attention should be paid to ensure that the strength and life reach the design requirements.
Application of Load Optimization Control of Thermal Power Unit Based on the Characteristics of Regulating Valve
Authors: Li Jun , Li WeiWei 
Published: June 2019

Abstract
In the long-term operation of thermal power units, the nonlinear and more complex viscous faults often occur in the regulator valve, which have obvious adverse effects on the dynamic performance of the load control. By using two point line models and Presiach models that are switched to each other to describe the switch asymmetry of the regulating valve and the different viscosity characteristics, the viscous fault of the regulating valve is effectively diagnosed, and the statistical consistency of the estimated values of model parameters are proved. Several key control technologies of thermal unit are given, and the control method of compensating the viscous fault of the regulating valve is presented, which weakens the adverse effect of the non-linear characteristics of the control valve on the dynamic control performance, and makes the main variables such as main steam pressure of unit achieve good dynamic performance.
Structure of Tunnel Digging and Loading Trolley and Calculation of Electronic Control System and Analysis of Common Faults of Electronic Control
Authors: Yi Zhang Mao , jun Zhang qi 
Published: June 2019

Abstract
The tunneling truck is mainly used for tunneling construction. It has the functions of digging, loading, anchoring, and wet spraying.This paper analyses the main structure and working principle of tunnel digging and loading trolley, the selection and calculation of main electrical components, the overall calculation of tunnel digging and loading trolley, and the common electrical faults and troubleshooting methods. It has certain reference value for domestic counterparts.
Research of the head equivalent velocity in the simulation of human-vehicle collision accident
Authors: Zhao H G , Hao B Q , Li C S , Yang N 
Published: June 2019

Abstract
In this paper, the equivalent velocity of head model based on HIC value is studied. Firstly, based on the existing pedestrian model, a large number of experimental simulation and statistical analysis have been completed after modification, and the functional relationship between HIC value and vehicle pedestrian contact speed has been obtained. Then, a separate head model is established according to the contact characteristics of the original dummy model, and the functional relationship between the HIC value and the collision speed when the head hits the windscreen is obtained by simulation, and the equivalent velocity relationship between the collision speed of the head model and the human-vehicle contact speed is deduced. Finally, according to the existing finite element head model and the coupling calculation method, the simulation results under the coupling calculation condition are explored. The equivalent velocity relation proposed in this paper has guiding significance to the value of collision velocity in the head collision model and also promotes the development of research on human-vehicle collision accidents.