bluuebunny/crossref_metadata_2025 huggingface dataset:
Existence of Global Attractor for a Modified Swift - Hohenberg Equation
Authors: Wu Ruili , Li Junyan
Published: December 2022

This study mainly aims to explore the existence of global attractor for a modified Swift-Hohenberg equation. The method we use was the classical existence theorem of global attractors and the theory of semigroups. Use this method we prove that the equation exist a global attractor in

H

1
2

space, and the global attractor attracts whatever bounded subset of

H

1
2

in the

H

1
2

-norm.
Research on Repeatability Calibration of Friction Coefficient of Transverse Force
Authors: Liu Lu
Published: December 2022

The friction coefficient of lateral force is an important index to evaluate the skid resistance of roads. The repeatable calibration technology of the coefficient depends on the road for a long time. The uncertainty introduced by the road surface in the calibration process is large, and the test process needs to close the road, which affects normal traffic. In this paper, the repeatability calibration technology of the lateral force friction coefficient was studied, and an indoor calibration device of the lateral force friction coefficient was developed. The calibration device was built by comparing the transmission scheme and the main component. The repeatability calibration method of the lateral force friction coefficient was designed, and the calibration test was carried out. The measurement uncertainty of the repeatability deviation coefficient was evaluated as U=1% (k=2).
Methods of Discovering New Physics from the Cosmic Neutrino Background
Authors: Zhou Yi
Published: December 2022

Neutrinos play a significant role in the thermal history of the early universe. The standard cosmological model predicts a relic sea of neutrinos, often referred to as the Cosmic Neutrino Background (CNB). The effects of CNB are parameterized as the effective number of neutrino flavors N
eff, which could be measured by indirect astronomy observations. The numerical calculations of the neutrino decoupling process give a result of N
eff = 3.046. To measure it with astronomy observations, the primordial abundance of elements from the Big Bang Nucleosynthesis (BBN) and the anisotropies in the distribution of the Cosmic Microwave Background (CMB) are investigated. The observation results basically match the prediction. Direct detection methods are also proposed via capturing neutrinos on a tritium target, which could be practical assuming a large-neutrino-mass cosmological model.
Numerical simulation of quantum key distribution network based on wavelength division multiplexing technology
Authors: Sun Shiju , Wang Jipeng , Su Dan , Ma Haiqiang
Published: December 2022

Wavelength division multiplexing (WDM) technology can improve the networking level and overcome the shortcomings of low key rate under the existing technic background of measurement device independent quantum key distribution (MDI-QKD) protocol application. reference frame independent quantum key distribution (RFI-MDI-QKD) protocol cut down on the influence of the reference frame drift on the key distribution system. The decoy state protocol has important development prospects in the development of quantum communication networking. Combining the advantages of of the above protocols to realize RFI-MDI-QKD with WDM, the results show that the key distribution efficiency is improved with the increase in the number of WDM multiplexed channels, which promotes the further exploration and achievement of QKD networking application.
Load-bearing Behavior of Offshore Rock Socketed Monopile Foundation Regarding Different Rock Mass Classification
Authors: Cheng Yongjin , Zhou Yong , Chu Weijiang , Su Ze
Published: December 2022

With the increasing electricity demand in China, wind power has been heavily developed in recent years. It is important to stabilize the wind turbine foundations in rock bedded near the sea area while installation. Based on different rock classification standards (GB 50218 and GSI), this paper numerically analyzed the load capacity of rock socketed monopile. When the rock class is high (class III and above), under effective socketed depth, the rock-socket effect is important, and the pile tip deflection is nearly 0, which could be considered as a clamping constraint. In this case, even if the rock quality around the pile tip decreases a little or becomes a little weakened, the pile deformation and internal force will not change a lot. However, when the rock mass class is lower than IV, the pile tip load capacity will largely decrease. The definition of rock mass parameters is also important when analyzing rock socketed monopile. In conclusion, it is suggested to take GB 50218 as a reference. BQ engineering rock mass classification and its corresponding rock mass parameters could be applied. Also, the M-C model is suggested to be used for some related work.
Design of a Low-Frequency Active Sonar Underwater Target Simulator Based on Bubble Clouds
Authors: Xu Pengbo , Zhao Yun , Tang Xiaoan , Sun Haiyang , Cai Qingyu , Lai Ming
Published: December 2022

According to the theory that bubble clouds have strong scattering properties in the water, effective medium theory (EMT) based on bubble clouds has been developed for a new kind of target simulator available for multi-static sonar experiments. According to the theory, the effects of the porosity of the bubble clouds and the size of the simulator on the backscattering strength of the target simulator are investigated. The optimal parameters for designing the target simulator are given by simulation analysis. Finally, by comparing with the traditional target simulator design scheme, it is shown that the target simulator designed based on EMT theory has the characteristics of low-frequency bandwidth, high target strength, small size, low cost, and application flexibility.
Simulation Diagram of Unmanned Vehicle Driving from Current Position to Optimal Parking Space Based on A* Algorithm
Authors: Chen Xinyu , Guo Junxi , Wang Tianyuan
Published: December 2022

To draw the simulation diagram of the unmanned vehicle driving from the current position to the optimal parking space, the parking space with the shortest distance from the starting point to the control point is defined as the optimal point in this paper. We simplify the driving route into a straight line and establish the coordinate axes. Depending on the driving direction, the driving trajectory can be divided into different cases. In each case, the order of the parking spaces passed by the vehicle is fixed. Therefore, if the parking space is occupied, its value is assigned as 0; otherwise, it is 1. The initial value is assigned as 0, and we accumulate the weighted value in each case. When the total weight reaches 1, accumulation stops, and the optimal parking space in this case is recorded. The optimal parking space is in which the vehicle travels the shortest distance among all the cases. Based on the A* algorithm, a raster map is constructed. The obstacle area is expanded by narrowing the feasible area range of control points in the parking lot so that the path of control points can meet the kinematic and obstacle avoidance constraints of vehicles. Finally, a simulation diagram of the parking trajectory is drawn.
MILP-based approaches for a bin-packing problem with a fixed-plus-linear charge scheme
Authors: Zhang Kai
Published: December 2022

In this paper, we consider a truck loading problem with a fixed-plus-linear charge scheme, which is thought to be more suitable for short-distance freight transportation than fixed charge schemes. Here, we study a mixed-integer linear program (MILP) formulation of this problem and develop two methods for solving it. We discuss the property of optimal solutions and tighten the formulation. Based on the polyhedral knowledge of orbit opes, we also provide a symmetry-breaking heuristic for this problem. We conduct a series of numerical experiments to indicate that the computational performance of the MILP formulation can be significantly improved by applying our method.
Earthquake Magnitude-Frequency Relationship and Earthquake Magnitude Prediction in North China
Authors: Zhao Rui , Chen Shijun
Published: December 2022

The magnitude-frequency relationships of earthquakes of magnitude M
L 2.0 or higher in North China, Shandong and neighboring areas since 1970 are calculated, and the long-term and annual-scale seismic intensities are analyzed. The maximum intercept magnitude and the annual-scale seismic intensity are M
L 7.5 and M
L 5.5, respectively, in North China within a long time frame. The three-year-scale time scan predicts that the maximum intercept magnitude and the seismic intensity in 2022 will be M
L 5.3 and M
L 4.8. In contrast, the maximum intercept magnitude and the annual seismic intensity in Shandong and neighboring areas are M
L 6.2 and M
L 4.5, and the three-year scale time scan predicts the corresponding values in 2022 will be M
L 4.8 and M
L 4.2, respectively. The predicted maximum earthquake magnitude in Shandong in 2022 has a high probability (63%) of not exceeding M
L 4.8. Furthermore, the theoretical annual average occurrences and recurrence interval for each earthquake magnitude in Shandong and neighboring areas are calculated, with an average of 30 earthquakes per year for magnitude 3.0, 3.1 earthquakes per year for magnitude 4.0, once every 3.1 years for magnitude 5.0, 29 years for magnitude 6.0, 282 years for magnitude 7.0, and 2713 years for magnitude 8.0. The maximum intercept magnitude in North China has gradually weakened in the past 50 years, yet this tendency is not obvious in Shandong. It is noteworthy whether this indicates seismic activities in North China have gradually entered a quiet period.
Study on Physical and Mechanical Properties of Micro-Cement Grouting Materials with Different Water-Cement Ratio
Authors: Wang Nianjin , Gao Yanhua , Pang Haoran , Zhu Liangtao , Xia Libo , Xia Bangqing
Published: December 2022

The water-cement ratio is one of the key parameters of grouting materials, which greatly affects the working performance and mechanical properties of grouting materials. This paper studies the physical properties, such as density, fluidity, consistency, bleeding rate, and stone rate, and the mechanical properties of flexural and compressive strength of micro-cement grouting materials with a water-cement ratio of 0.8:1, 1:1, 1.5:1 and 2.0:1 are investigated through a variety of indoor experiments. The results show that with the gradual increase of water-cement ratio, the density, consistency value, stone rate, flexural strength, and compressive strength of micro-cement grouting material gradually decrease, while the fluidity and bleeding rate of micro-cement slurry gradually increases. Although the slurry with a water-cement ratio of 1.5:1 and 2:1 has good fluidity, the high bleeding rate and the low stone body strength result in more water injected into the reinforced formation and low reinforcement strength. On the contrary, the slurry with a water-cement ratio of 0.8:1 has a low bleeding rate and high stone body strength, but low fluidity. The grouting performance and mechanical properties of the slurry with a water-cement ratio of 1:1 are relatively balanced. This study provides a basis for the subsequent on-site ultra-fine cement grouting project. A reasonable water-cement ratio can be selected according to the specific needs to ensure the reinforcement quality and safety of the grouting operation.
Preparation of Silicon Carbide Film by Composite Sintering of Silicon Nitride and Silicon Carbide
Authors: Sun Wenyue , Huang Zhiliang , Chen Changlian , Chen Song
Published: December 2022

Graphite can be protected by coating it with a silicon carbide film. However, studies on the effects of different coating methods and process parameters on the thickness and bond strength of the films are not yet mature. In this paper, silicon nitride (Si3N4) and silicon carbide (SiC) are used as raw materials, and SiC films are successfully prepared on the surface of graphite substrate by composite sintering at high temperatures. The phase and microstructure of SiC films were characterized by X-ray diffractometer (XRD) and scanning electron microscope (SEM), respectively, and the effect and mechanism of sintering temperature on the formation of SiC films were investigated. The results show that Si3N4 and SiC decompose under high temperatures to generate silicon vapor and carbon-silicon gas molecules, which migrate to the graphite surface to react with C and recrystallize to form a SiC film. The main crystal phase of the SiC film at high temperature is 3C-SiC, the spherical SiC grains with smooth surfaces and small size gradually grow into regular hexagonal grains, and the SiC film is denser and thicker.
Analysis of stamping dezincification of DP590 alloyed hot dip galvanized dual phase steel
Authors: Huang Geng , Liu Xueli , Li Liejun
Published: December 2022

with the requirements of vehicle lightweight and safety performance, dual phase steel is more and more widely used in vehicles. However, the stamping of the sheet has attracted more attention due to the increased use of dual-phase steels in auto parts. In this paper, the surface morphology, composition, surface kinetic friction coefficient, and plate thickness change rate of stamping plates were detected, calculated, and analyzed respectively. Based on solving the problem of the dezincification defect of DP590 alloyed hot-dip galvanized dual-phase steel during stamping. In addition, the stamping die was also investigated and analyzed, The results showed that the stamping die has deteriorated beyond the service life, resulting in the reduction of the adaptability between the die and the material. More importantly, the low Fe content and high dynamic friction coefficient of the surface of the stamped plate made the zinc layer unable to keep up with the tensile deformation of the substrate during stamping, which was the main factor for the lamellar detachment at the interface between the zinc layer and the substrate. By updating the dies and improving the plate design, the stamping dezincification defects of the sheet have basically disappeared.
Experimental study on physical and mechanical properties of foamed lightweight soil for underwater backfilling
Authors: Zhu Zhigang , Hu Xiaowu , Liu Xuyang , Liu Yaobang , Ye Xiansong , Liu Yamei
Published: December 2022

In this paper, foam lightweight soil was prepared from river sand and cinder from thermal power plants as raw materials. Combined with the requirements of embankment pouring and backfilling, the strength development, compressive strength, softening coefficient, water absorption, and other physical and mechanical properties of two different aggregate foam lightweight soils were compared. The applicability of foam light soil with river sand and cinder as aggregate in pouring and backfilling of hydraulic structures is analyzed and studied, which provides application and reference for related engineering and solid waste recycling.
Research on Geometrical Features of FGH95 Nickel-based Superalloy by Coaxial Single Track Laser Cladding
Authors: Wang Jingwen , Fang Jun , Zhang Peipei , Wang Songling , Wang Dongsheng
Published: December 2022

FGH95 nickel-base superalloy powders were coated on GH4169 nickel-base superalloy by coaxial single-track laser cladding. The effects of process parameters on cladding width and cladding height were studied based on the three-factor and three-level orthogonal experiment. The experimental results are nonlinearly fitted by MATLAB software, and the mathematical model between the geometrical features and the process parameters is set up. The results show that the effect factor on the clad width is in the order of first power, followed by feeding rate, and scanning speed. However, the influence on the clad height is in the order of first scanning speed, followed by laser power, and feeding rate. The average prediction error of cladding width and height is less than 7%. The model can accurately forecast the geometrical features of the cladding coating and can offer some references for the optimization of laser cladding.
Research on high temperature deformation behavior and constitutive relation of Ti2AlNb alloy
Authors: Fan Jiafeng , Li Xiaoqiang , Xu Ganglai , Hou Jinbao , Wang Xuecheng , Zhu Zhencen , Shao Yonglin
Published: December 2022

A high-temperature plastic deformation is a failure form of Ti2AlNb alloy that deserves attention in the service process of aero-turbine engines. In this study, the deformation behavior of Ti2AlNb alloy has been studied through compression at 900 ~1100 °C and strain rates of 0.1 s−1, 0.01 s−1, and 0.001s−1. Then, the constitutive model of Ti2AlNb alloy has been established based on the true stress-strain curve. The results show that Ti2AlNb alloy has a high sensitivity to strain rate and temperature at the experimental condition. Ti2AlNb alloy still maintains good resistance to deformation at 900 °C, and the microstructure at the core region is basically unchanged after compression. In the boundary region, the microstructure changes significantly under the influence of stress. However, the yield strength of Ti2AlNb alloy decreases to about 5 MPa at 1100 °C, 0.001s−1, and the microstructure of the alloy has significant transformation which the O-phase structure decomposes and forms the α2 strip structure.
Research on solidified shell thickness in continuous casting blank
Authors: Li Huicheng , Wang Haixin , Yu Fei , Liu Haining , Chen Tingjun , Liu Sheng
Published: December 2022

The stability of solidified shell thickness plays an important role in continuous casting. In this paper, 220mm × 260mm section continuous casting blank of an electric furnace company is taken as the research object. Under the condition of solidification process, the solidification shell thickness is simulated by the physical model established and ANSYS software. At the same time, according to the calculation formula of solidified shell thickness, combined with the specific data location of the designed and measured solidified shell thickness test, the good match between the experimental calculation and the model prediction is achieved. It provides a reliable basis for following F-EMS optimization and essential data sustain for the transformation and promotion of solidified structure of the blank under light pressure soft reduction.
Optimized preparation of MgO-ZrO2 nanocomposite powders by assisted sol-gel method
Authors: Song Zhijian , Liu Shikai , Huang Bin , Wang Jialin , Han Bibo , Yan Guojin , Sun Yaguang
Published: December 2022

To address the problems of the non-uniform mixing of raw materials and abnormal grain growth that often exists in traditional methods for nano-zirconia matrix composites, an assisted sol-gel method was employed to prepare MgO-ZrO2 nanocomposite powders. The effects of the addition of MgO and calcination atmosphere on the phase content and microscopic morphology of the ZrO2 powders were investigated. The results showed that ZrO2 powders with 5 wt% MgO could be partially stabilized in the tetragonal phase by calcination in a vacuum, and had small particle size and narrow particle size distribution, with an average particle size of about 95 nm. Compared with the samples calcined in air, the particle size of the powder in a vacuum is smaller, so it is more conducive to the stability of the tetragonal phase of zirconia.
Optimization of structural parameters of rotary swaging dies based on orthogonal experiments
Authors: Sun Xinxin , He Xuewen , Cao Kaihua
Published: December 2022

In order to alleviate the problem of excessive stress and easy wear on the rotary swaging die during the process of rotary swaging high-strength tungsten wire, the die structure was changed, the transition taper was designed, and the structural parameters were optimized to achieve the purpose of reducing the stress and extending the life of the rotary swaging die. The results show that the improvement of the die structure can largely reduce the effective stress of the die, and it is found that the transition fillet has the greatest influence on the effective stress of the die, followed by the cone angle of the transition taper, and the length of the transition taper has the least effect on the effective stress of the die. Finally, the optimal die structure parameters after improvement were obtained by orthogonal experiments: the cone angle of transition taper is 4°, the length of transition taper is 10 mm, and the radius of transition fillet is 3 mm.
Optimized design of sliding bearing parameters for electromagnetic direct drive cone crusher
Authors: Tian Fanghong , Tang Chao , Li Liejun , Wu Dongbo , Zhang Qixiao , He Yihua , Xu Erling
Published: December 2022

The introduction of direct electromagnetic drive technology into hydraulic cone crusher has brought great progress to the traditional crushing technology, but the sliding bearing has repeatedly burned and held during the trial production of the prototype, which poses a new challenge to the trial work. In this paper, the failure of the sliding bearing of the direct-drive electromagnetic cone machine during the trial operation was analyzed. Then the sliding bearing structure was optimized, which ensured the safe and stable operation of the direct-drive electromagnetic cone machine.
Analysis of the influence of different droplet size distribution on wing impact characteristics and ice shape
Authors: Bai Yuxiang , Hu Shushan
Published: December 2022

When an aircraft is flying, due to the presence of a large amount of liquid water in the air, the liquid water will freeze on the surface of the wing and accumulate into ice, which is one of the most important factors leading to flight accidents, and the particle diameter of water droplets is an important reason to determine the impact characteristics of water droplets. Taking the NACA0012 airfoil as the research object, the N-S equation is used to obtain the flow field characteristics, and the influence of the multi-size distribution of droplets and the diameter of droplets on the impact characteristics and the ice pattern under the airfoil is numerically calculated by using the finite element software. The results show that the larger the diameter of the water droplet, the larger the impact area on the wing surface, and the larger the liquid water collection coefficient on the wing surface. Different droplet size distribution has a non-negligible effect on the ice pattern.
Research on the design of new high-strength and high-toughness steel and its manufacturing parameters
Authors: Zuo Duo , Liang Liang , Wu Teng , Li Zhao , Xiong Weiliang , Wu Run
Published: December 2022

The lightweight of the steel structure can be achieved by the high strength and high toughness of steel. In this paper, the composition design and optimal manufacturing process of the experimental steel were investigated. The fine and uniform microstructure of tempered sorbite can be obtained under the conditions of TMCP (Thermo Mechanical Control Process), 920 °C quenching, and 650 °C tempering for the steel by micro-alloying with Nb, V, and Ti. The steel has properties as follows: yield strength of 1015 MPa, tensile strength of 1076 MPa, elongation of 14.5%, and -40 °C AKV 81 J. The parameters of quenching and tempering heat treatment have a decisive influence on the size and distribution of ferrite grains and precipitates of tempered sorbite.
AIRRT*: An improved fast path planning algorithm for manipulators
Authors: Chen Jie
Published: December 2022

Path planning algorithms based on sampling have been widely studied and applied in recent years, among which the Informed-RRT* algorithm is a typically progressive optimization algorithm. To overcome the weakness of low optimization efficiency of the Informed-RRT* algorithm, an improved algorithm AIRRT* (Adaptive Informed-RRT*) is proposed, which can greatly improve optimization efficiency and improve the quality of optimized paths. According to the node distribution of the initial path, the appropriate node construction areas are dynamically selected first in the process of direct local sampling. Then collision detection and reconstruction are performed. Unlike the traditional algorithm, the AIRRT* algorithm determines the area to be reconstructed firstly, then performs direct local sampling in the reconstructed area, and finally reconstructs the path to improve the sampling efficiency. In addition, to reduce the searching difficulty of global path nodes, the invalid nodes are removed in reconstruction, which limits the growth of nodes in optimization. AIRRT* algorithm is compared with the common algorithms through simulation experiments, which proves that AIRRT* algorithm has obvious advantages in algorithm efficiency and path quality and has good applicability in varied scenarios.
Simulation Analysis and Optimal Design of Spinning Head Dynamic Balance
Authors: Mao Luyao , Zeng Wenhao , Cheng Xiping , Huang Dong , Chen Qiyu
Published: December 2022

The laying head is an important equipment in a high-speed wire rod production line. The dynamic imbalance of the spinning head will cause the laying head to vibrate greatly during operation, which will seriously affect the spinning quality and the life of the laying head. In order to make the dynamic balance of the laying head meet the requirements, the critical rotational speed of the laying head rotor is firstly analyzed by using ANSYS software, and it is concluded that the laying head rotor is a rigid rotor. Then, the double-sided dynamic balance simulation of the spinning head was carried out using ADAMS software, and the correction masses required by the spinning head on the two calibration surfaces were obtained. The counterweight structures are designed according to the dynamic balance simulation results, and the thicknesses of the counterweight structures are optimized. The dynamic unbalance masses M1 and M2 of the optimized spinning head in the two calibration planes are reduced from 1.2456kg and 3.7855kg before optimization to 3.9133e-6kg and 2.9954e-6kg, and the eccentricity is reduced from 0.9966mm to 0.0002236mm, meet the design requirements.
Intelligent Control Method for Head Thickness of Plate
Authors: He Chunyu , Wang Shuncai , Jiao Zhijie , Wang Jun
Published: December 2022

In the process of plate rolling, the characteristics of low head and tail temperature, large biting impact, and large torsional vibration affect the high-precision control of thickness, which makes it difficult to further improve the control accuracy of the traditional GM-AGC model based on feedback control. Using the characteristics of reversible plate rolling, the processing history information of the rolled piece during the entire rolling process is tracked, and the known information of the previous pass is used to intelligently correct the subsequent pass. Based on the traditional absolute AGC control model, adaptive thickness feedforward control is carried out for the sharply changing position of the thickness at the head of the rolling piece to reduce the thickness deviation of the unstable position.
Research on a control method of tunnel cable inspection track robot based on intelligent obstacle crossing
Authors: Liu Yuanyuan , Zhang Wei , Lin Ge Lin
Published: December 2022

In order to improve the resolution ability of the cable inspection robot in the dark environment of the tunnel and enable it to complete the autonomous obstacle avoidance control, a new intelligent obstacle crossing control method for the tunnel cable inspection track robot is studied, and the working environment of the inspection robot is explored, the Denavit-Hartenberg parameter method is used to establish the obstacle crossing model of the inspection robot, the joint variables of each robot are analyzed, and the position and posture of the end effector of the robot are obtained. The minimum value of the sum of moments is obtained by using the approximate solution method, and the winding deflection and torsion angle of the inspection robot is calculated by reverse solution. The robot obstacle-crossing motion workspace is analyzed by using the optimization algorithm, and the three-dimensional coordinate system is established. It is decomposed into the X-Y coordinate system, Y-Z coordinate system, and x-z coordinate system, so as to determine the maximum distance that the end gripper pops up on each axis, and judge whether the inspection robot can achieve obstacle crossing. According to the feedback results, intelligent control is carried out, and experiments are designed to verify the effectiveness of the control method. The results show that the voltage value of the inspection robot obtained by the control method is closer to the theoretical value, which can effectively help the robot to achieve obstacle-climbing operation accurately.
Simulation and performance degradation of carburized polyimide films in a space radiation environment
Authors: Ding Yigang , Shen Zicai , Nie Xiangyu , Zhang Yongtai
Published: December 2022

Advanced space materials are important to support the development of space technology. Their performance restricts the development of spacecraft to a great extent. However, the space environments encountered by spacecraft in orbit will lead to the degradation of material properties. The stability of the material in the space environment directly affects the performance level and service life of spacecraft. For the space radiation effects on space materials, a method to determine ground test parameters using depth-dose profile simulation is presented. By using this method, a ground test of the effects of space radiation environment in medium earth orbit for 8 years on carburized films was performed. The solar absorptance, infrared emittance, and surface resistivity of the test samples were measured. The results showed that the solar absorptance of the material changed significantly after irradiation, decreased by 10.3%, the infrared emittance decreased by 0.033, and the surface resistivity decreased slightly. The SEM photos indicated that the surface of the sample became rougher and there were more small holes. The XPS results indicated that the chemical bonds in the surface of samples changed under combined irradiation, and the C==O bond changed to C—O bond.
Study on prevention of symptoms based on plantar pressure array typesensor composite system
Authors: Zou Ji , Yu Lei , Ma Zhongjing
Published: December 2022

This paper focuses on the introduction of a low-cost, compatible measurement system for monitoring plantar pressure, which is suitable for today’s prevention of stress gait diseases. The gait analysis method is adopted and the technical specifications of the sensor array are determined. The analysis of measurement data based on deep learning method and neural network classification shows that it is possible to separate measurement between repeated patterns of health and disease. In order to realize the foot pressure sensor element, multi wall carbon nanotubes (MWTCNT) - polydimethylsiloxane (PDMS) - printed composite material was selected. In order to measure the plantar pressure distribution, a sensor matrix made of composite materials is completely printed and used in specific tests.
Numerical simulation analysis of laser-arc hybrid welding of austenitic stainless steel
Authors: Wang Yixuan , Bai Yang , Huang Chuhuan , Cui Bo , Gao Yingxiang
Published: December 2022

Laser-arc hybrid welding heat source has high energy density, and the temperature field is very uneven and unstable. It is impossible to systematically study the welding temperature field only through process tests. For this reason, the calculation of the thermal process of hybrid welding is of great significance to the systematic study of the temperature field of hybrid welding. In this paper, the laser-arc hybrid welding process of 8mm thick austenitic stainless steel was simulated by SYSWELD software. The results indicate that with the increase of laser energy, the melting time increases, and the peak temperature rises from 1,230°C to about 2,000°C; When the laser energy is 3.0 kW, the welding deformation reaches the minimum value of 0.68 mm, but the peak value of equivalent stress is high, which is 476.8193 MPa. When the arc voltage increases, the peak temperature rises from 1,650°C to 1,850°C, and the melting time increases. The arc voltage has little effect on the equivalent stress of the weld and has a clear impact on the welding deformation. When the voltage is 18 V, the maximum deformation reaches 2.191 mm.
Theoretical study of the 3H(p, e
+
e
−)4He and 3He(n, e
+
e
−)4He processes and the X17 anomaly
Authors: Viviani M.
Published: December 2022

The unexpected observation of eccess of events in the angular distribution of e−e+ pairs in various nuclear transitions has spurred a large interest, both experimentally and theoretically. This eccess has been interpreted as the possible existence of a new bosonic particle, the so-called X17, of mass around 17 MeV. In the present work, we investigate theoretically the possible effects of the presence of the X17 in the 3H(p, e
+
e
−)4He and 3H(n, e
+
e
−)4He reactions. For these processes it is possible to compute accurate ab initio bound- and continuum-states wave functions, so the existence of X17 can be unambigously revealed. Moreover, by exploiting the rich structure of the 4He spectrum, it is possible to determine its quantum number, as, for example, if it is either a scalar, a pseudoscalar, a vector, or an axial particle.
Searching for New Physics with DarkLight at the ARIEL Electron-Linac
Authors: Cline E , Corliss R , Bernauer J C , Alarcon R , Baartman R , Benson S , Bessuille J , Ciarniello D , Christopher A , Colon A , Deconinck W , Dehmelt K , Deshpande A , Dilling J , Dongwi D H , Fisher P , Gautam T , Gericke M , Hasell D , Hasinoff M , Ihloff E , Johnston R , Kanungo R , Kelsey J , Kester O , Kohl M , Korover I , Laxdal R , Lee S , Li X , Ma C , Mahon A , Martin J W , Milner R , Moore M , Moran P , Nazeer J , Pachal K , Patel T , Planche T , Rathnayake M , Suresh M , Vidal C , Wang Y , Yen S
Published: December 2022

The search for a dark photon holds considerable interest in the physics community. Such a force carrier would begin to illuminate the dark sector. Many experiments have searched for such a particle, but so far it has proven elusive. In recent years the concept of a low mass dark photon has gained popularity in the physics community. Of particular recent interest is the 8Be and 4He anomaly, which could be explained by a new fifth force carrier with a mass of 17 MeV/c
2. The proposed Darklight experiment would search for this potential low mass force carrier at ARIEL in the 10-20 MeV/c
2 e+e− invariant mass range. This proceeding will focus on the experimental design and physics case of the Darklight experiment.
Proton Radius: A Puzzle or a Solution!?
Authors: Jentschura Ulrich D.
Published: December 2022

The proton radius puzzle is known as the discrepancy of the proton radius, obtained from muonic hydrogen spectroscopy (obtained as being roughly equal to 0.84 fm), and the proton radius obtained from (ordinary) hydrogen spectroscopy where a number of measurements involving highly excited states have traditionally favored a value of about 0.88 fm. Recently, a number of measurements of hydrogen transitions by the Munich (Garching) groups (notably, several hyperfine-resolved sublevels of the 2S–4P) and by the group at the University of Toronto (2S–2P
1/2) have led to transition frequency data consistent with the smaller proton radius of about 0.84 fm. A recent measurement of the 2S–8D transition by a group at Colorado State University leads to a proton radius of about 0.86 fm, in between the two aforementioned results. The current situation points to a possible, purely experimental, resolution of the proton radius puzzle. However, a closer look at the situation reveals that the situation may be somewhat less clear, raising the question of whether or not the proton radius puzzle has been conclusively solved, and opening up interesting experimental possiblities at TRIUMF/ARIEL.
Electrodisintegration of 16O and determination of astrophysical S-factors of the inverse reaction
Authors: Friščić I. , Donnelly T.W. , Milner R.G.
Published: December 2022

We performed Monte Carlo calculations in a simple model that relates the radiative capture and electrodisintegration reactions and showed that by using a windowless gas jet target and modern energy-recovery linear accelerators (ERLs, CBETA at Cornell, MESA at Mainz, ARIEL e-linac at TRIUMF) to reach high luminosity, a high precision measurement of the electrodisintegration of the 16 O nucleus would provide a method to determine the rate of the α on 12 C radiative capture with a superb statistical precision compared to existing data. The calculations were done for the beam energies of 30, 50 and 114 MeV and show a significant reduction in terms of statistical uncertainties for the energy range E
c.m. < 2 MeV. The 114 MeV setting has the smallest statistical uncertainty, but at the same time the calculations for this beam energy setting were performed the furthest away from the real photon limit. The feasibility of this simple model still needs to be studied experimentally. This could be done with an experiment focused at Ec.m.
> 2 MeV region, where the cross section is much larger.
Comparison of Histogram Features and Co-occurrence Matrix in Identification of Lung Cancer X-Ray Images with Naive-Bayes Method
Authors: Bustomi M A , Rusnandar A M
Published: December 2022

Many studies have been carried out on the identification of objects in the image. One feature often used in object identification is the histogram feature of digital images. The next development is the use of a digital image co-occurrence matrix as an identifier. This study aims to compare the use of two object identifiers in images that are not derived from visible light but are images derived from X-rays. In this study, the X-ray image is an X-ray image of lung cancer, and the object identification method used is the Naive Bayes method. The number of lung X-ray images used was 100 images. The master image is divided into 60 images for training and 40 images for testing. This study's results indicate that using a digital image co-occurrence matrix as an identifier gives better results than the histogram feature. This study concludes that the comparison of histogram features and co-occurrence matrix in X-ray images shows the same results as in visible light images.
The Influence of Guided Inquiry Learning Model through Experimental Method for Understanding the Concept of Students in Calorie Material
Authors: Sinon I L S , Sapari K R , Allo A Y T
Published: December 2022

This study aims to see the effect of the application of guided inquiry learning models through experimental methods on students' concepts comprehension in the calorific material of class XI at YPK Oikoumene High School. The instruments used in this project include pretest, posttest, and worksheet questions to measure students' cognitive domains and psychomotor observation sheets to measure students' psychomotor. This type of research is pre-experimental design research. The population in this study is the same as the sample used, namely class XI Science YPK Oikoumene High School academic year 2020/2021, amounting to 22 students. Data analysis using the application Facets, Ms Excel and SPSS 22. The results showed that the guided inquiry learning model through the experimental method influences the understanding of student concepts, and the n-gain test value of 0.78 is a high criterion. The value of psychomotor activity meeting 1, 2, and 3, respectively 86.14, 85.96, and 90.35, also increased. Psychomotor values can be seen that the guided inquiry learning model through the experimental method of understanding the concept has increased. It can be concluded that there is an influence of the guided inquiry learning model through the experimental method on students' concepts comprehension, worksheet, psychomotor, and happy learning physics.
Online-Based Assessment of Students’ Conceptual Understanding of Energy and Momentum Using Quizizz
Authors: Yana A U , Koes-H S , Taufiq A , Kusairi S
Published: December 2022

Energy and momentum are the two most fundamental topics taught in physics education, for many physical phenomena involve the analysis of these two concepts simultaneously. Therefore, an assessment of the conceptual understanding of the energy-momentum material needs to be carried out to explicitly map the level of conceptual understanding students have of the two materials. Quizizz is one online media that assesses understanding of energy-momentum physics concepts remotely and flexibly. This research was conducted on 66 high school students using five conceptual questions adapted from the Energy Momentum Conceptual Survey (EMCS). The results of the analysis show that the percentage of understanding the concept of energy and momentum of high school students is 54% and is in the intermediate level category.
Development of Digital Module ‘Phymology’ on Optical Instruments
Authors: Arnida N S , Wibowo F C
Published: December 2022

One of the technological innovations in the 21st century that can be applied in the learning process is the use of digital-based instructional media. While, the learning media in the form of digital modules is still relatively little used in learning physics in schools. This study aims to produce learning media in the form of a digital module 'Phymology' on optical instrument material. This research uses Research and Development (R&D) research methods and is based on the ADDIE development model. The ADDIE development model has five stages, namely the analysis stage, the design stage, the development stage, the implementation stage and the evaluation stage. The digital module in this optical instrument material was developed in the PBL (Problem Based Learning) stage and contains STEM aspects, namely science, technology, engineering and mathematics. The final result of the development of a digital module for this optical instrument material is an android application with an apk format that can be downloaded via the Google Play Store and then installed on the student's smartphone device.
Development of Mobile Learning Applications (MLA) Electromagnetic Induction Based on PjBL to Improve Students’ Critical Thinking Skills
Authors: Solihin A , Iswanto B H , Wibowo F C
Published: December 2022

Efforts Mobile or smartphone is one of the most strategic media used in 21st-century learning. This study aims to develop Mobile Learning Applications (MLA) Electromagnetic Induction Based on PjBL that are valid for physics learning in high school and improve the critical thinking skills of high school students on electromagnetic induction material. The method used in this research is Research and Development. Media development is carried out by referring to the ADDIE development model which consists of five stages of the development process, namely: Analyze; Design; Develop; Implement and Evaluate. The results of the electromagnetic induction MLA validity test by experts are in the very good category, as well as the results of the media implementation trials for teachers are in the very good category. The results of the trial implementation of the media to students were in a good category and the results of the N-gain test experienced an increase in the average N-gain score from pretest to post-test by 0.45 or 45% were in the medium category. Thus, it can be concluded that the development of Mobile Learning Applications (MLA) Electromagnetic Induction Based on PjBL which was carried out in this study was valid for physics learning in high school and could improve the critical thinking skills of high school students.
E-Book Learning Research in Physics Education During the Last Five Years: A Review and Bibliometric Study
Authors: Dawana I R , Dwikoranto  , Setiani R , Marsini
Published: December 2022

E-Book Research Increases every year consistently and has an excellent opportunity to be developed. This study aims to examine the type of document, the author's keywords, the country's contribution to learning about the subject of e-books in physics, and potential future research topics related to e-books. Through bibliometric analysis, a literature review is used in this research method with the help of Publish or Perish (PoP) software and Vosviewer to find articles. The data source was obtained from the Google Scholar database, which obtained 13,200 articles in 2017-2021 with the keywords "E-Book Physics Education". In the meantime, the Scopus database found 21 publications with the term "E-Book Physics" from 2007 to 2021. The results of the bibliometric analysis show that the trend of research topics and the contribution of Indonesian researchers is still relatively lacking, but the highest publication contribution by Indonesia. This is a challenge for future research to prove the extent to which the existence of E-Books can continue to be developed. Additionally, there are suggestions for research areas in learning with keywords, one of which is STEM. Therefore, E-Books can be used with a STEM approach to enhance students' learning abilities, particularly in understanding physics, and be used in subsequent studies.
Effectiveness of Polyvinyl Alcohol Nanofiber Composites as Anti-Bacterial Materials in Wound Dressing
Authors: Kusumawati D H , Munasir  , Rohmawati L , Uzalia P , Layli M D , Rahanti A B , Yuliani I
Published: December 2022

Closing the wound using a wound dressing can speed up the wound healing process. The ideal wound dressing has the characteristics of being able to maintain the humidity of the environment around the wound and prevent the entry of microorganisms. In addition, wound dressings also do not cause a residual effect on the skin when removed, which can cause an irritating effect on the skin. This effect can be minimized by using a very fine fibrous wound dressing, in this case using a very small fiber (nanofiber). Materials that meet the criteria for wound dressings include polyvinyl alcohol (PVA). PVA composite nanofibers can be fabricated using the Electrospinning method. The nanofiber composites used include PVA/PVP/Chitosan, PVA/ZnO, PVA/Gelatin and PVA/Chitosan. Where the composite material has the ability to absorb, and the fiber diameter is in the range of 130-230 nm. Based on the anti-bacterial characterization, PVA composite effectively blocks the entry of microorganisms for approximately 3 - 4 hours, with efficiency ranging from 47.6% - 95.7%. The lowest efficiency was found in PVA/Gelatin composites and the highest in PVA/ZnO.
Level of Students’ Conceptual Understanding of Static Fluid
Authors: Irma Z U , Kusairi S , Yuliati L
Published: December 2022

The research aims to explore the level of students’ conceptual understanding of static fluid. This quantitative descriptive research involves 30 students. The research instrument consisted of 10 reasoning multiple choice questions with reliability is 0.629. Student responses are categorized into five levels of conceptual understanding, which are level 0 (NU), level 1 (SM), level 2 (PU/SM), level 3 (PU), and level 4 (SU). The result shows that most students at level 4 (SU) for the concept of hydrostatic pressure are related to density. Most students at level 3 (PU) for the concept of hydrostatic pressure related to the density of the fluid and the depth of objects, and the concept of material which can be floating. Most of the students at level 2 (PU/SM) for the concept of hydrostatic pressure related to the depth of objects, fluid pressure in an enclosed space, buoyancy, and the object's position in the liquid. Some things that can be done to reduce or eliminate students' misconceptions about this topic are deriving a hydrostatic pressure equation, conducting experiments using two injection pistons connected to a hose filled with fluid, and showing a demonstration of immersing two objects with the same mass but different volume or shape, deriving the origin of the equation for buoyancy, and finding the ratio of the density of the object and the fluid as a determinant of the position of the object in the fluid.