bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation Analysis of Transmission System of Module Propellant Storehouse Based on ADAMS
Authors: Huang Wenkuan , Yang Liu , Guan Jiawei 
Published: August 2021

Abstract
A virtual prototype of the transmission system of a module propellant storehouse is established in ADAMS simulation environment. First, dynamic analysis of the key parts of the transmission system, mainly clutch, is carried out. Then, the 3D model needs to be simulated is established in Solid Works. Finally, combined with the macro commands in ADAMS, the virtual prototype model of the transmission system is established in ADAMS, which can complete the dynamic simulation of the whole loading process. In the simulation process, the parameters are adjusted and optimized to meet the actual situation. The simulation results are analyzed and verified, which can provide some reference basis for the design and selection of driving motor, electromagnetic clutch and other key parts of the transmission system.
An Analytical Method for Plane Elasticity Problems Involving Circular Boundaries
Authors: Jiang Zhizhen , Zhang Rui , Gong Shiyu , Hou Jiahui , Jin Xiaoqing 
Published: August 2021

Abstract
Complex structure with circular boundaries is commonly used in engineering practice, and it is essential to conduct a detailed analysis of the interior stress field of the structure. The Michell stress function is a well-known general solution for plane elasticity problems in the polar coordinates, particularly when circular boundaries are involved. This work presents an analytical method with the assistance of the Michell solution, which could be seamlessly combined with Fourier analysis. Using the expansion of Fourier series, problems with arbitrarily distributed loads can be handled via a standard procedure. A complete analytical solution is elaborated for an arbitrarily loaded circular ring, and a classical elastic solution is provided for verification.
Numerical Simulation of Rigid Projectiles Penetration into Concrete Targets with Different Warhead Shapes
Authors: Zhang Xuguang , Li Wenbin , Wang Xiaoming 
Published: August 2021

Abstract
When the projectiles with different head shapes impact and penetrate the concrete targets, the resistances of the target plates to the projectiles are significantly different, which is manifested by the time history curve of different accelerations, velocities and the penetration depths of the projectiles, resulting in the obvious differences of the penetration ability of the projectiles to the targets with a same compressive strength. In order to determine the influence degree of projectiles with different head shapes on the penetration ability, ANSYS/LS-DYN is adopted. The finite element numerical simulation software is used to simulate and analyze the three kinds of rigid projectiles: oval (including double oval and oval), conical (including double conical and conical) and cone oval. Among them, the projectiles all penetrated C40 concrete cylindrical targets vertically at an initial velocity of 700m/s. The results show that the penetration ability of the optimal oval, conical and cone oval projectile is gradually reduced, and the highest penetration ability is the oval projectile numbered as dan001, whose final penetration depth is 539cm.
Finite Simulation of Deformation Mechanism of a Perforated Plate and Applications
Authors: Hong Xuanyu , Hu Xiaoyi 
Published: August 2021

Abstract
In recent years, new metamaterials emerge one after another in various fields with various functions, showing a bright future for the development of metamaterials. Negative Poisson’s ratio material is one of the promising materials. It has a wide range of applications in mechanical engineering, acoustics and architecture science. This paper attempts to explore the different deformation mechanisms and possible applications of perforated plate materials with negative Poisson’s ratio. Finite element analysis is used to simulate a typical perforated plate structure, which shows negative Poisson’s ratio effect and abundant deformation forms in vibration condition. In addition to the existing applications in vehicle buffering and building noise reduction, this paper proposes that the perforated plate can be used as a filter screen for water treatment, as well as the filter screen of air purifier. In addition, it can also be used to cultivate precious herb seedlings. Intersects with the medical field, it can even manufacture the vascular embolization treatment device, which can ensure that the longitudinal does not contract and scratch the blood vessel when the blood vessel is opened. On the basis of this study, we can further study the special properties of metamaterials and solve the specific problems in various applications.
The Conjecture of the Essence of Gravitation
Authors: Xie Qibin 
Published: August 2021

Abstract
The purpose of this paper is to explore the causes of universal gravitation, and the law that the gravitation produced by the motion of matter and the absolute dead matter has no mass was put forward. Combined with Newton’s law of universal gravitation, Einstein’s equation of mass loss, cosmic expansion phenomenon, black hole phenomenon, matter infinitely separable theory and so on, this paper discusses the essence of gravitation. Through universal gravitation, electric field force, magnetic field force and quantum entanglement phenomenon, the concept of wave-point force is put forward, and a theory of gravitation law is obtained, that is, the forces of different wave points do not interfere with each other. Combining dark matter and cosmic expansion, the hypothesis of dark matter gravity law is put forward. Finally, some conclusions are summarized, and this paper puts forward some conjectures.
The Nonlinear Propagation and Interaction of Ultrashort Pulses in High-Speed Optical Fiber Transmission Systems in Optics
Authors: Zhou Haoran 
Published: August 2021

Abstract
The fourth-order dispersive nonlinear Schrödinger (FODNLS) equation can simulate the nonlinear propagation and interaction of ultrashort pulses in high-speed optical fiber transmission systems in optics. In this paper, all traveling wave solutions of the envelope are obtained by means of the polynomial complete discriminant system and the elementary integral method. Under specific parameters, the propagation modes of all solutions are given. In this paper, by using the direct integration method, all traveling wave solutions of the envelope of the equation are given, including the singular rational solution, the singular periodic solution, the solitary wave solution and the double periodic solution.
Thermal Emissivity Measurement with Two-temperature Method
Authors: Ying Yunbin , Li Qiang , Kaur Sandeep , Ghosh Pintu 
Published: August 2021

Abstract
Thermal emissivity is one of the most important indices used to evaluate thermal emission capability of an object and is essential for characterization of thermal emitters, especially in the field of infrared thermal emission engineering for various applications, including personal thermal management, radiative cooling and heat preservation, infrared stealth, and infrared encryption. However, due to the natural background thermal emissions from the ambient environment and experimental setup, conventional methods generally ignore the background emissions while keeping the temperature of the radiating sample significantly higher than the ambient temperature. Here, we introduce a simple method that enables accurate measurement of emissivity of a given sample without necessitating high temperature through elimination of background emission noise by the difference of the measured emission signals of the sample at two different temperatures.
Vanadium Oxide Nanoparticles Doped Polymer to Modulate Thermal Emissivity
Authors: Zhu Zehao , Li Qiang , Pattanayak Arnab , Ghosh Pintu 
Published: August 2021

Abstract
Vanadium oxide (VO2) finds a wide range of applications owing to its excellent reversible phase change properties. We demonstrate a method for doping a polymer with VO2 nanoparticles towards realizing a thermal emissivity modulation device, which is expected to supplement the conventional preparation of VO2 film layers using magnetron sputtering, vapor deposition, and such techniques which are relatively cumbersome and expensive. The comparison of thermal emissivity modulation ability of VO2 film membrane structure on silicon substrate obtained by magnetron sputtering and pressed tablet sample obtained from VO2 nanoparticles reveals that the latter also demonstrates substantial thermal emissivity modulation ability. Furthermore, the emissivity of this fabricated PDMS-VO2 blended sample can change from 0.90 to 0.71 in a heating test. This provides us a new technique to fabricate a scalable, cost effective, and widely applicable thermal emissivity modulation device.
Numerical Simulation and Experimental Research of Flow Resistance Characteristics of East Lower Tungsten Divertor Module
Authors: Tian Kun , Li Lei , Yao Damao , Han Le , Xu Tiejun , Zhuang Qing , Yang Lei 
Published: August 2021

Abstract
During long-pulse plasma operation with high power in tokamak, excessive heat load on divertor may lead to material melting or erosion of the first wall material, which enhances impurity radiation and degrades plasma performance. As an important component of the first wall, divertor cooling system is important for the high power and stable operation of the device. The Experimental Advanced Superconducting Tokamak (EAST) is committed to achieving more than 400 s long-pulse H-mode operations, which is equipped with a first wall of full metal. The 10 MW/m2 heat load on divertor means a big challenge for the continuous operation of the system, but the current divertor cannot meet the conditions, so it needs to be upgraded. In order to check whether the cooling water system of the new divertor in EAST can meet the requirements, a fluid test was built to measure the flow rate and flow drop of the divertor. The results show that the difference between the test results and the results of ANSYS-based simulation is 9 %, and the maximum difference between the results of the comparison of two different model parts is 3 %. It is concluded that the cooling water system of the divertor in EAST can achieve the heat load and safety requirements.
Numerical Analysis of Heat Transfer and Flow Field for CFETR Divertor
Authors: Tian Kun , Li Lei , Yao Damao , Xu Tiejun , Han Le 
Published: August 2021

Abstract
Nuclear fusion is now the ultimate need for energy, tokamak is one of the possible devices for controlled nuclear fusion. Based on the advanced tokamak magnetic confinement configuration and the research results of fusion physics in recent decades at home and abroad, Chinese Fusion Engineering Test Reactor (CFETR) will carry out innovative physical design to achieve the international requirements. Divertor is an essential component of the magnetic confinement fusion device, which directly sustains the strong particle flow and high heat load. The cooling system of divertor will directly affect whether divertor can function properly. In this paper, a new structure of divertor suitable for CFETR is designed and simulated, both the flow field analysis and the heat transfer analysis of the model were verified. The results show that the designed divertor structure can meet the system requirements.
Optimizing the classification ability of CNN for SAR fully polarized radar data based on DCGAN
Authors: Bu ZeCong , Zhang Yue , Zheng AnMai 
Published: August 2021

Abstract
In recent years, the deep learning network is widely used. In the field of remote sensing images, due to the high cost of image acquisition, there are still too few training samples, which greatly limits the application of deep learning in SAR data classification. This paper proposes a method that is generating simulated SAR image by generative adversarial network, and uses the image as the training data of convolutional neural network. Aiming at the impact of the simulated images generated by DCGAN’s generator on the classification of convolutional neural networks. The results show that DCGAN can fully extract the main features of the image, and the convolution model based on DCGAN can make CNN have better classification ability and get rid of the dependence on the sample size. CNN can also make full use of simulation data. Whether it is test data set or random dataset, its F1 score can obviously surpass the classification ability without DCGAN’s simulated data. In experiments with different sample numbers, the highest F1 score is 93.6479 in the dataset with DCGAN’s simulated data. In another experiment, its F1 Score reached 87.32, higher than the dataset without DCGAN’s simulated data.
Extraction and inversion of two-dimensional spectrum parameters based on TDIP data
Authors: Gao Zhu , Luo Runlin , Xiang XianLi , Xia Zhengxia , Zhao Zhifeng 
Published: August 2021

Abstract
Conventional TDIP can only obtain two parameters: apparent resistivity and polarizability, so it is difficult to interpret the effective information of ore bodies with high precision, especially the symbiotic and associated ore bodies with little difference in resistivity and polarizability, such as pyrite and carbonaceous limestone, while the spectral parameters (cm and τ) can quantitatively evaluate the abnormal characteristics of mineralized bodies and are rich in geoelectric information. Based on the field apparent resistivity observation mode of Cole-Cole model, the charge rate values of symmetrical quadrupole arrangement of two typical mineralized bodies are calculated by finite element method forward simulation from the 2D point source, this paper puts forward a method for extracting the corresponding spectrum parameters from the chargeability value of TDIP data and verifies the effectiveness of the method.The results show that the abnormal shape is obvious and is consistent with the actual model parameters, which can reflect the spectral parameter characteristics of each abnormal body, realize spectral imaging, and provide a favorable basis for further division of polarization abnormal bodies. This method has been applied to the TDIP data processing of a lead-zinc mine in Wuzhou City, Guangxi Province and good results have been obtained.
Preliminary assessment of BeiDou Navigation Satellite System satellite orbit determination accuracy and positioning accuracy
Authors: Hu Yutao , Meng Zhijun , Jiang Yi , Zeng Zhe , Wang Guangming 
Published: August 2021

AbstractOrbit determination accuracy and positioning accuracy are two key indexes to assess the performance of navigation system. With frontal positioning methods put forward, the effect of orbit determination accuracy on positioning accuracy is decreasing. In this paper, three main positioning methods provided by BDS is introduced, and the influence of BDS orbit determination accuracy on the results of single point positioning, differential positioning and precise point positioning is respectively deduced. After that, data from two receivers set at Beijing and Chengdu is analysed to evaluate orbit determination accuracy and positioning accuracy. Apart from several extreme values, BDS satellites radial orbit errors are within 1.5m, tangential orbit errors are within 2m and normal orbit errors are less than 5m. Accuracy of single point positioning differential positioning and precise point positioning is 1.9m 1.2m and 0.3m, respectively. Effect of orbit determination accuracy on single point positioning is significant. On the other hand, orbit determination accuracy has less effect on differential positioning accuracy and precise point positioning.
Design and Realization of Test System for Digital Input and Output Module
Authors: Lv Meimei , Ou GuoFeng , Sun Zhentao 
Published: August 2021

Abstract
Aiming at the problems of the various types of digital input and output modules in the anti-harsh hardened computer, the lack of a dedicated test system and the incomplete testing, a dedicated digital input and output test system with a wide test range was designed. The system is based on single-chip microcomputer and FPGA and can provide 64 channels of digital output (0∼30V adjustable), 64-channel digital or voltage value input test, 64 channels of switch-type digital signal, and the status of the tested module can be read in real time through the host computer software. The digital input and output modules can solve the current situation of incomplete functional testing, and the test results are accurate, stable, and reliable, with a compact structure and multiple test channels.
Numerical Simulation Study on Turbulent Heat Transfer Characteristics of Supercritical Fluid in Micro-Fin Tubes
Authors: Gaoxiang Ma , Yanglong Duan 
Published: August 2021

Abstract
In consideration of the technical requirements for compact and efficient heat-exchange equipment in industrial fields, such as sludge incineration heat utilization, solar thermal power generation and aerospace, this paper analysed the supercritical nitrogen flow and heat transfer processes in square straight micro-fin tube, triangle straight micro-fin tube and smooth circular tube under different Re numbers, and obtained the changes in velocity field, local turbulence intensity, average Nusselt number and resistance coefficient of supercritical fluid in micro-fin tubes. Moreover, it was found that the introduction of micro fin was able to improve the turbulent heat transfer performance of supercritical fluid in tubes within certain Re number range.
Research of PD transfer ratio analysis of converter transformer IPVD test based on distributed parameters
Authors: Yu Xinru , Jia Pengfei , Wu Chao , Deng Junyu , Zhang Shuqi , Cheng Huanchao 
Published: August 2021

Abstract
In the process of factory test of converter transformer, the withstand voltage test with partial discharge is usually used to judge whether the internal insulation structure is in good condition or not. If there is no partial discharge, the insulation is in good condition. There are tens of thousands of insulation materials in UHV converter transformer, and the winding structure is complex. If partial discharge is detected during the withstand voltage test, it is impossible to locate the discharge position quickly and accurately. In this study, by analysing the partial discharge signal transmission relationship in the withstand voltage test of converter transformer, combined with the partial discharge signal transmission model of converter transformer winding based on distributed parameters, the partial discharge area in the converter transformer winding is calculated and judged. This method can be applied to the IVPD test of converter transformer to assist in locating the partial discharge area in the winding, greatly shorten the time of fault diagnosis and location of converter transformer, and enhance the scientificity and effectiveness of the test.
Probing the distribution of redox in the diffusion layer of the substrate electrode by the scanning electrochemical microscopy
Authors: Guo Haixia , Shao Huibo 
Published: August 2021

Abstract
Taking advantage of the dual working electrodes and the precise positioning of the tip electrode of the scanning electrochemical microscopy, the distribution of ferrocenemethanol in the diffusion layer of the substrate electrode is studied when the substrate potential is applied. When the co-directional potential is applied to the substrate, the closer to the surface of the substrate electrode, the less the amount of ferrocenemethanol. Because the reaction of the substrate electrode and the tip electrode is the same, they compete with each other. When the reverse potential is applied to the substrate electrode, the closer to the surface of the substrate electrode, the more the amount of ferrocenemethanol. Because the reaction of the substrate electrode can regenrate ferrocenemethanol.
Study on the influence of the number of guide vane blades on the flow characteristics of axial flow pump
Authors: Changsheng Chen , Shan Li , Haitao Li , Zhenlai Ma , Qiang Wang 
Published: August 2021

Abstract
Axial flow pump is widely used in energy, agriculture, urban water supply and drainage, water conservancy engineering, ships and other fields. As one of the important flow passage parts of axial flow pump, guide vane can be used to smooth the rotation of fluid after passing through the impeller, change it into axial motion, and change the kinetic energy of rotation into pressure energy. In this paper, the hydraulic performance and pressure pulsation of axial flow pump with three different guide vane numbers are analyzed by numerical simulation. Under rated flow and large flow conditions, increasing the number of guide vanes is more conducive to suppress the pressure pulsation.
Fabry Perot Cavity Length Demodulation Method Based on Continuous Thinning Algorithm of Fast Fourier Transform Spectrum
Authors: Yu Jiawang , Bian Qiang , Tong Yude , Zhu Zhen 
Published: August 2021

Abstract
Optical fiber Fabry Perot sensors are widely used in industrial production and life. It is of great significance to improve the performance of sensor demodulation algorithm. Based on the analysis of the principle and error source of the cavity length demodulated by the Fast Fourier Transform (FFT) algorithm, the FFT-FT algorithm with continuous refinement of FFT spectrum is introduced. By using the feature that FFT-FT algorithm can refine at the peak of discrete spectrum, the length of F-P cavity demodulated by FFT algorithm is optimized to improve the accuracy of the demodulation. Through simulation experiments, the F-P cavity length of FFT demodulation algorithm and FFT-FT demodulation algorithm under the same light source signal are compared and analyzed, and the goodness of fit of the fitting curve of continuous demodulation is analyzed. The simulation results show that the error of FFT demodulation algorithm is more than 100 times that of FFT-FT algorithm when it is refined 100 times near the peak value of FFT discrete spectrum. The goodness of fit of the demodulation fitting curve calculated by FFT-FT algorithm is more than 2 times that of FFT algorithm, which proves that the improved algorithm demodulation F-P cavity length value has better consistency with the real value.
Research on voltage restoration of island microgrid based on multi-agent fixed-time algorithm
Authors: Zhuang Yan , Zhao Yan , Wei Mofan , Liu Qian , Shao Qianzhi 
Published: August 2021

Abstract
This paper presents a distributed, robust and fixed-time secondary control for voltage restoration of an islanded microgrid with droop-controlled inverter-based distributed generators (DGs). The network inverter of AC microgrid is set as a multi-agent cooperating system, and voltage recovery can be regarded as a synchronization problem. Different from the existing distributed methods, the method in this paper can ignore the dependence on the initial conditions and the distributed controller based on consensus can restore the voltage magnitude of the island microgrid to the standard reference value in a fixed-time. In order to improve the stability, a fixed-time second-order convergent sliding mode surface is proposed. This method can quickly reach a consensus and has better anti-interference ability and robustness. Finally, the performance of the proposed control strategy is verified.