bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electromagnetic characteristics analysis of dual-frequency magnetic single negative metamaterials
Authors: Dong Yunxia , Ren Jiaxin , Hu Mao 
Published: July 2024

Abstract
With the development of multi-frequency wireless transmission technology, it is necessary to expand the research of single-frequency metamaterials in the multi-frequency field. The dual-frequency metamaterial studied adopts a nested square spiral structure, which can resonate at two frequencies, and the real part of the equivalent permeability of metamaterial changes dramatically at the resonance frequency, and the equivalent electromagnetic parameter exhibits anomalous characteristics in the two frequency bands. Firstly, the effects of the number of turns, the width of the copper wire, the spacing of the copper wire, and the length of the outermost edge of inner and outer helical coils are investigated, respectively, using the HFSS software on the resonance frequency of dual-frequency metamaterials, which improves the study of dual-frequency metamaterials with nested square spiral structure. Then, based on the results of the change rule of resonance frequency with the four types of influencing factors, the dual-frequency metamaterials with the real part of the equivalent permeability close to -1 at 6.78 MHz and 13.56 MHz are designed, which is of certain reference significance for the subsequent practical design of dual-frequency metamaterials to satisfy the needs of the project.
Design of dual-quadrant power supply based on bidirectional full-bridge transformation technology
Authors: Yu Feng , Li Bin , Zhang Genmiao , Ying Peng , Xu Zongfei 
Published: July 2024

Abstract
Dual-quadrant programmable power supply is a bidirectional programmable DC power supply that integrates the functional characteristics of power supply and feedback load. This article adopts an automatic hybrid control method based on bidirectional energy flow, which adopts a phase-shifting control method and PWM control method respectively to achieve bidirectional control of power conversion.
Driver circuit design based on NI-6363 data acquisition card for the magnetic fluid deformable mirror
Authors: Li Xiang , Zhao Jiyuan , Zeng Dongsheng , Iqbal Azhar , Wu Zhizheng 
Published: July 2024

Abstract
Commonly used methods for generating diffraction-free beams are prone to signal loss or coding errors. Therefore, a method of generating a diffraction-free beam based on a magnetic fluid deformation mirror (MFDM) with dual-layer actuators is proposed. It can produce the desired wavefront in real-time and has the advantages of a large magnitude of mirror deformation, low manufacturing cost, continuous and smooth surface, and easy expansion of the actuator. In this paper, a driver circuit is designed based on Simulink and NI-6363 data acquisition card for the MFDM with its multi-channel control ability. The experiment result shows that the driver circuit can accurately produce the signal for each channel, and has the advantages of stable output, simple operation, and strong expandability.
Line Selection of Single-Phase Fault Grounding System Based on the Deviation Criterion of Composite Zero-Sequence Admittance
Authors: Zhang Linli , Liu Hejin , Su Guoqiang , Zhang Shidong , You Xinhong 
Published: July 2024

Abstract
The current methods for line selection of small current fault grounding system faults within distribution networks have some limitations. This paper proposes a method based on the deviation criterion of composite zero-sequence admittance for line selection of single-phase fault grounding systems with small currents. First, the derivation formula of zero-sequence admittance for small current grounding systems considering asymmetrical transmission lines is presented. Then, a method based on the deviation criterion of composite zero-sequence admittance is proposed for accurate fault line selection. Finally, a fault model is built by using simulation software and simulation experiments are conducted to verify that this method can rightly select the fault line by significant feature values.
A concentration reflector device of a bifacial photovoltaic module
Authors: Yuan Quanhong 
Published: July 2024

Abstract
At present, the development of bifacial photovoltaic modules is rapid, but there is a lack of concentrating light devices in bifacial photovoltaic modules for power generation. This paper analyzes the changing patterns of solar altitude and azimuth angles and the influence of plane mirror reflection concentrating light on the performance of bifacial photovoltaic power generation. Using MATLAB programming, it calculates the pattern of change of the intensity of reflected light with the installation height h of the plane mirror. Then, a double plane mirror concentrating device is designed, which can do real-time dynamic tracking of the sun’s azimuth and altitude angle and realize the power generation capacity of the PV module is multiplied.
Optimization Design of Temperature Field Distribution for AC High Voltage Parallel Capacitors
Authors: Guo Jiang , Lin Hao , Li Hui , Xu Mengyi , Huang Xiang , Jiang Shengbao 
Published: July 2024

Abstract
With the change in the overall harmonic working background of the system, the harmonic current spectrum borne by high-voltage AC shunt capacitors becomes increasingly complex, particularly with a gradual increase in high-frequency harmonic content. The wide frequency band, large value range, and long duration of harmonic current lead to increased heating of the capacitor. In this paper, a thermal field physical model is established for an AC parallel filter capacitor based on the skin effect, and trends are analysed in the current distribution of the capacitor plate under the skin effect. Furthermore, based on this established model, it is analysed how harmonic order and capacitor placement mode affect temperature field distribution within the capacitor, and it is concluded that these factors impact temperature rise release. This research lays a theoretical foundation for designing capacitor unit structures.
Research on Closed Loop Control of Pulse Power Discharge Frequency
Authors: Kang Zhongjian , Fu Xueyuan 
Published: July 2024

Abstract
During the process of improving unconventional oil and gas reservoirs using electric pulse stimulation, to achieve optimal effects in terms of rock matrix pore dilation and fracturing, it is required that the electric pulse frequency is close to the inherent frequency of the reservoir. In the context of research focused on open-loop control for the discharge frequency of a high-pressure pulse device, the topological structure and mathematical model of the high-pressure pulse discharge device have been established. The analysis of current variations during the discharge process has been conducted. A closed-loop control strategy based on the super-helix sliding mode control has been proposed, along with the introduction of a nonlinear extended state observer. This strategy aims to achieve closed-loop control of the discharge frequency, and its effectiveness and control performance have been verified through simulation.
Cathode failure behavior of ArF excimer laser glow discharge
Authors: Jiang Xiaolei , Zhu Xinghong , Han Tao , Guo Xin 
Published: July 2024

Abstract
In this paper, the failure behavior of the glow discharge cathode of the ArF excimer laser was investigated. The morphology and composition of the cathode were characterized by scanning electron microscopy, energy spectrometer and high resolution laser confocal microscope. The results show that Ar ions sputtering occurs in the cathode discharge area, resulting in sputtering pit, molten morphology and resolidified particles. Due to the thermal effect induced by sputtering, Zn element evaporates violently, which intensifies the cathode erosion. Argon ion sputtering experiments proved the influence of random sputtering on the generation of sputtering pits. The main failure form of the non-discharge region is the corrosion of F2 molecule, which is dominated by Cu and Zn fluoride, and the fluorination layer is not dense.
Evaluation of soil accelerated corrosion of typical grounding materials used for electrical equipment
Authors: Chen Hao , Zhang Tao , Qiao Xin , Xie Liming , Tan Xiaomeng 
Published: July 2024

Abstract
At present, research methods for soil corrosion include sample weight loss methods, physical and chemical properties research, electrochemical research, indoor accelerated corrosion tests, etc. However, most existing soil corrosion evaluation methods have many drawbacks, such as high research costs, long experimental cycles, long results transformation cycles, and significant environmental limitations. In this paper, based on the electrochemical test results of environmental corrosion factors using typical grounding materials, a corrosion simulation solution load spectrum and an accelerated corrosion experimental system corresponding to the soil corrosion environment level were established. The accelerated corrosion samples were thoroughly studied and analyzed using macroscopic morphology observation, microscopic morphology analysis, and energy spectrum analysis. The results show that the soil accelerated corrosion method has strong stability and small deviation, which applies to the study of accelerated corrosion in the soil environment of grounding materials.
Effect of laser power on microstructure and properties of laser cladding AlCoCrNiSiTi0.5 high-entropy alloy coatings
Authors: Wang Tao , Li Shuang , Chen Haojie , Zhao Hui , Jiao Haichao , Liu Hongwei , Zhao Haitao , Gong Xun 
Published: July 2024

Abstract
Using varying laser powers, an AlCoCrNiSiTi0.5 high-entropy alloy (HEA) coating was applied to the surface of TC4 titanium alloy. The microstructure and phase composition of the coating were examined using several analytical techniques, including energy spectrometer (EDS), scanning electron microscopy (SEM), and X-ray diffraction (XRD), etc., and Vickers hardness tester was used to test the coating’s microhardness at various laser powers. Studies indicate that the coating is mostly made up of the following phases: BCC, FCC, α-Ti, β-Ti, (Si, Al)2Cr, (Ni, Co)Ti2; The coating’s mean hardness under different powers (1400 W, 1600 W, 1800 W) is 1047.87 HV, 1012.68 HV, and 846.72 HV, which is about 2∼3 times of the matrix hardness (347.27 HV). Powder overburning will occur at laser energies greater than 1800 W. The elements evaporate, thereby reducing the microhardness of the coating. The hardness of TC4 titanium alloy can be greatly increased by applying an AlCoCrNiSiTi0.5 HEA coating.
Experimental study on bending forming of AZ31 magnesium alloy equal curvature panel
Authors: Liu Zhongyu , Li Yanjuan , Wang Zhongtang , Liu Quan 
Published: July 2024

Abstract
The process parameters of bending forming for magnesium alloy panel are determined, and magnesium alloy panel bending tools are developed. The experimental research is completed, and several specifications of magnesium alloy panels are processed successfully, without cracks, rib buckling, or rib shoulder collapse defects. During the bending process of the magnesium alloy panel, the press height and rib height ratio have a significant effect on the microstructure of the panel. With the increase of press height and rib height ratio, the grain size decreases. The microstructure and properties of the magnesium alloy panel are improved and grains are refined. When the rib height ratio is 7/2 and press height is 7 mm, the minimum grain size at the rib of the panel is 15.6 µm and the minimum grain size at the skin surface is 17.2 µm.
Preparation of Modified α-Cyanoacrylate
Authors: Tong Kun , Wu Lin , Hu Ya , Liu Ying 
Published: July 2024

Abstract
In order to increase the viscosity and tensile shear strength of ethyl α-cyanoacrylate, Nano-silica modified α-cyanoacrylate (NS/α-Cyanoacrylate), hydroxylated multi-walled carbon nanotubes modified α-cyanoacrylate (CNTs/α-Cyanoacrylate) and epoxy resin modified α-cyanoacrylate (EP/α-Cyanoacrylate) were synthesized using the improved Knoevenagal Condensation method. The structural characteristics of the prepared ethyl α-cyanoacrylate were characterized using Fourier transform infrared spectroscopy. For the modified ethyl α-cyanoacrylate, the relationships between the filler content and the viscosity or tensile shear strength were analysed by rotary viscometer and electronic universal testing machine. Finally, it was found that the addition of Nano-silica, hydroxylated multi-walled carbon nanotubes and epoxy resins can improve the viscosity and tensile shear strength of α-cyanoacrylate. The best dosages of Nano-silica, hydroxylated multi-walled carbon nanotubes and epoxy resin were 5%, 0.2% and 4.5 %.
Research on the Wear Evolution Behavior of 20CrMnTi Alloy Steel under Different Loading Conditions
Authors: Wu Xiaolong , Du Yaosen , Gao Pengju , Tang Xiaoren , Wang Xiaosai 
Published: July 2024

Abstract
20CrMnTi alloy steel has excellent surface hardness and good wear resistance, making it widely used in the preparation of key components of various high-speed and high-load gearboxes, such as gear, rack, and bearing. However, the existence of friction and wear behavior in service leads to various damage behaviors, which seriously affects its service stability and effective life. Based on experimental research and numerical simulation technology, this study reveals the damage evolution law of 20CrMnTi low carbon alloy steel under different wear load conditions. It is shown that the increase of wear load and time duration will obviously lead to the increase of contact stress and deformation of the material surface, and eventually lead to an increase in wear degree. The research findings provide experimental support and theoretical guidance for effectively predicting the damage law in actual service.
Motivic coaction and single-valued map of polylogarithms from zeta generators
Authors: Frost Hadleigh , Hidding Martijn , Kamlesh Deepak , Rodriguez Carlos , Schlotterer Oliver , Verbeek Bram 
Published: July 2024

AbstractWe introduce a new Lie-algebraic approach to explicitly construct the motivic coaction and single-valued map of multiple polylogarithms in any number of variables. In both cases, the appearance of multiple zeta values is controlled by conjugating generating series of polylogarithms with Lie-algebra generators associated with odd zeta values. Our reformulation of earlier constructions of coactions and single-valued polylogarithms preserves choices of fibration bases, exposes the correlation between multiple zeta values of different depths and paves the way for generalizations beyond genus zero.
Learning quantum symmetries with interactive quantum-classical variational algorithms
Authors: Lu Jonathan Z , Araiza Bravo Rodrigo , Hou Kaiying , Dagnew Gebremedhin A , Yelin Susanne F , Najafi Khadijeh 
Published: July 2024

Abstract
A symmetry of a state

|
ψ
⟩

is a unitary operator of which

|
ψ
⟩

is an eigenvector. When

|
ψ
⟩

is an unknown state supplied by a black-box oracle, the state’s symmetries provide key physical insight into the quantum system; symmetries also boost many crucial quantum learning techniques. In this paper, we develop a variational hybrid quantum–classical learning scheme to systematically probe for symmetries of

|
ψ
⟩

with no a priori assumptions about the state. This procedure can be used to learn various symmetries at the same time. In order to avoid re-learning already known symmetries, we introduce an interactive protocol with a classical deep neural net. The classical net thereby regularizes against repetitive findings and allows our algorithm to terminate empirically with all possible symmetries found. An iteration of the learning algorithm can be implemented efficiently with non-local SWAP gates; we also give a less efficient algorithm with only local operations, which may be more appropriate for current noisy quantum devices. We simulate our algorithm on representative families of states, including cluster states and ground states of Rydberg and Ising Hamiltonians. We also find that the numerical query complexity scales well for up to moderate system sizes.
Performance analysis of supply chain for construction materials at high rise building project based on Supply Chain Operations Reference Method: A case study
Authors: Marzuqi R A , Abma V 
Published: July 2024

Abstract
Supply chain management is an approach to implementing lean construction efforts to minimize construction project problems, such as cost overruns, project delays, and disputes. Implementation of supply chain management is necessary, especially in the procurement of materials. However, there is a need to measure performance during the implementation. Results of measurement can show the extent to which the project operates and use it as a benchmark to determine the end impact of a project. This study’s purpose is to measure of supply chain performance with the supply chain operation reference (SCOR) method and use the analytical hierarchy process (AHP). Compile data using an observation with scoring form based on standards adoption, categories, and SCOR metrics through key performance indicators (KPI) and structured interviews with the contractor to validate. Limited to the study is the supply chain of ready-mix concrete materials. The AHP method give the weight of the output value of the KPI. The results of the KPI measurements from the contractor’s perspective are that one indicator is still at a low value, which is a cycle time for fulfilling orders. An overall result of 84.83 from the measurement KPI suggests a “good” performance category.
Assessing the applicability of rainfall index spatial interpolation in predicting landslide susceptibility: A study in Brunei Darussalam
Authors: Salleh Hamirol Aqim , Rahman Ena Kartina Abdul , Ratnayake Uditha 
Published: July 2024

Abstract
Rainfall is crucial in meteorology and hydrology, significantly impacting landslide risk assessment. This study focused on evaluating rainfall’s role in determining landslide susceptibility in Brunei Darussalam’s Jalan Kota Batu-Subok and Jalan Jangsak-Tutong regions. Using monthly rainfall data (2008 – 2018) from four weather stations, three spatial interpolation methods inverse distance weighting (IDW), radial basis function (RBF), and global polynomial interpolation (GPI) were assessed. The RBF proved superior in predicting rainfall distribution, evidenced by lower error metrics and higher correlation coefficients. The landslide susceptibility index (LSI) derived from the RBF’s rainfall interpolation showed high accuracy in identifying landslide-prone areas, with success rates between 89 % and 94.3 %, and prediction rates from 85.2 % to 95.9 % across the two areas studied. These findings suggest that the RBF-derived LSI is a reliable tool for landslide risk assessment. However, the LSI’s stability, irrespective of the rainfall data or interpolation method used, indicates that factors like terrain and human activities might have a more significant impact on landslide risks than rainfall alone. This research highlights the importance of considering various factors in landslide risk management and land-use planning, offering valuable insights for policymakers and local authorities.
Removal of methylene blue (MB) from polluted water by using eco-friendly dragon fruit peels and pineapple crown leaves
Authors: Bakar Amalina Amirah Abu , Jamil Nurul Athirah , Muhammad Ali Khairul Ammar , Badrealam Sabariah 
Published: July 2024

Abstract
Dye is a widely used product in many industries that produce coloured goods. The by-product discharge after the colouring process finishes will contribute to dye pollution in wastewater thus polluting the water bodies nearby the areas of discharge. To treat the pollution due to dye like methylene blue (MB), adsorption is the most common treatment where natural adsorbents like dragon fruit peels (DFP) and pineapple crown leaves (PCL) have the potential to do so. The physical characterization of the DFP, and PCL was then analysed by scanning electron microscope. Batch adsorption experiment was adopted where the hybrid adsorbents of DFP and PCL were recorded successfully removed 84 to 92 percent of MB at 140 minutes. The removal was determined by using two different parameters which were varied dosage and contact hour. Adsorption isotherm models such as Langmuir and Freundlich Isotherm were being used along with kinetic analysis, Pseudo-First and Pseudo Second order in this study. At the end of this study shows that natural adsorbents such as DFP and PCL can be one of the alternatives to treat water pollution due to effluents from industry in the wastewater at the treatment plan.
Laboratory evaluation of cutback bitumen modified with cup lump rubber
Authors: Farhan Nasralddin Abdullah , Norhidayah Abdul Hassan , Mohd Warid Muhammad Naqiuddin , Ros Ismail Che , Hanif Mahmud Mohd Zul , Yahya Mohsen Zakariya 
Published: July 2024

Abstract
This research introduces a novel approach to addressing challenges in conventional asphalt used for road construction by incorporating cup lump rubber into cutback bitumen. The study investigates the viscosity and flash point of the resulting cutback bitumen to identify the optimal solvent percentage for achieving a lower mixing and compacting temperature range. Various diluent percentages were tested, ranging from 40% to 50%, across temperatures from 30°C to 70°C. Results indicate that higher diluent percentages lead to decreased viscosity in the blended bitumen. The most efficient solvent content for producing cutback bitumen-modified cup lump rubber is identified at 45% and 50% by weight of the bitumen, offering a reduced mixing and compaction temperature range. However, higher diluent content increases volatility potential and reduces the flash point. Additionally, toxicity testing reveals that lead and zinc are consistently present in cup lump rubber-infused samples, albeit below hazardous waste limits set by TCLP. The absence of lead in unmodified cutback bitumen underscores its compliance with environmental safety standards. These findings underscore the minimal environmental impact of this innovative modified bitumen formulation.
The effect of psychology factors and environmental concerns on mass rapid transit usage intention among private vehicle users in Klang Valley, Malaysia
Authors: Jamaluddin Tun Ahmad Adlan Asma’an , Wahab Ahmad Fakhri Fakhruddin Abd , Borhan Muhamad Nazri , Arham Ahmad Firdhaus , Ibrahim Ahmad Nazrul Hakimi 
Published: July 2024

Abstract
Since its introduction in 2016, Malaysia has made improvements to the mass rapid transit (MRT) system; however, the current year’s usage figures are below expectations and do not meet target levels. Thus, the purpose of this study is to look at the elements that influence the behavioural intentions of private vehicle users to use the MRT in Malaysia. In this study, A total of 403 respondents who are private vehicle users from the Klang Valley were involved and the Pearson correlation test was used to investigate the relationship between the factors that potentially influence the behavioural intention to use MRT among private vehicle users. Next, the factors influencing private car users’ behavioral intention to utilize MRT were also investigated using the multiple linear regression method. The findings of Pearson’s correlation analysis show that all factors namely environmental concerns, perceived behavioural control, attitudes, subjective norms, and behavioural intention have a positive and significant relationship among those factors. Furthermore, the multiple linear regression model demonstrated that drivers of private vehicles are significantly influenced by attitude, subjective norms, and environmental concerns to switch to MRT as a mode of transportation.