bluuebunny/crossref_metadata_2025_split huggingface dataset:
Interfacial engineered PANI/carbon nanotube electrode for 1.8 V ultrahigh voltage aqueous supercapacitors
Authors: Ji Zhichao , Liu Congcong , Xie Wenhe , Liu Shenghong , Zhang Chao , Liu Fuwei , Sun Haibin , Lu Yang , Pan Xuexue , Wang Chunlei , Wang Zhuanpei 
Published: January 2023

Abstract
Flexible three-dimensional interconnected carbon nanotubes on the carbon cloth (3D-CNTs/CC) were obtained through simple magnesium reduction reactions. According to the Nernst equation, the cell voltage based on these pure carbon electrodes without any additives could reach 1.5 V due to the higher di-hydrogen evolution over potential in neutral 3.5 M LiCl electrolytes. In order to improve the electrochemical performance of the electrodes, 3D-CNTs/CC electrodes covered with polyaniline barrier layer (3D-PANI/CNTs/CC) were prepared by in situ electropolymerization using interfacial engineering method. The assembled symmetric supercapacitors display a broadened voltage of 1.8 V, high areal capacitance of 380 mF cm−2, outstanding areal energy density of 85.5 μWh cm−2 and 84% of its initial capacitance after 20 000 charge-discharge cycles. This work demonstrated that the interface engineering strategy provides a promising way to improve the energy density of carbon-based aqueous supercapacitors by widening the voltage and boosting the capacitance simultaneously.
The investigation of linear relationship between domain wall creep parameters in Co/Pt multilayers
Authors: Li Xiaolei , Qiao Huifang , Niu Yabin , Gao Runliang , Wu Huiliang , Ye Yuchen , Liu Qingfang , Wang Jianbo 
Published: January 2023

Abstract
In this work, we investigate the linear relationship between domain wall creep parameters, and evaluate the effect of material parameters on magnetic domain wall creep in a series of Pt/Co/Pt multilayers with perpendicular magnetic anisotropy. The results for the samples with different magnetic layer thicknesses verify the linear relationship between the domain wall creep parameters, which is because in these samples both domain wall creep parameters are mainly affected by Co layer thickness and both of the domain wall creep parameters are proportional to the Co layer thickness. With the assistance of surface acoustic waves, the domain wall creep parameters also follow the linear relationship. This suggests a relationship between the anisotropy density K and local pinning strength

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:

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K

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.

The above linear relationship does not exist in annealed samples because annealing breaks the relationship between the local pinning strength and material parameters.
Influence of magnetic (Fe) and non-magnetic (In) doping on structural, magnetic, and weak anti-localization properties of Bi2Te3 topological insulator
Authors: Kander Niladri Sekhar , Guchhait Suman , Das A K 
Published: January 2023

Abstract
In this article, we have studied the changes in structural, magnetic, and magneto-transport properties of Bi2Te3 topological insulator doped with magnetic (Fe) as well as non-magnetic (In) elements. The un-doped along with Fe, In-doped Bi2Te3 are grown using a melt growth technique. The Rietveld analysis of x-ray diffraction data expresses that both In and Fe-dopants substituted the Bi-position with a little bit of interstitial incorporation in host Bi2Te3. It is also noticed that In-doping is slightly more favorable for Bi-substitution than Fe. The magnetic characterization reveals a mixing of diamagnetic and Pauli paramagnetic behavior of un-doped and In-doped Bi2Te3, whereas, Fe-doping shows overall paramagnetism with local anti-ferromagnetic interactions among Fe-ions without long-range order. The electrical-transport study represents the metallic response of host Bi2Te3, which is well-maintained for In-doping; however, Fe-doping exhibits prominent anomalies in ρ
xx –T profiles. Importantly, magneto-conductance research indicates a notable deviation of host quantum feature, weak anti-localization effect (WAL) upon magnetic (Fe) doping, whereas non-magnetic In-doping shows a comparatively weak deviation in WAL effect for high doping limit.
Orthorhombic and triclinic modifications of the arsenate Cu4O(AsO4)2 and isotypic phosphates Cu4O(PO4)2: strongly frustrated antiferromagnetics
Authors: Volkova L M 
Published: January 2023

Abstract
A structural-magnetic models of the orthorhombic and triclinic modifications of the arsenates Cu4O(AsO4)2 and isotypic phosphates Cu4O(PO4)2 has been built and analyzed. Their base elements are the complicated ribbons composed of antiferromagnetic Cu4 tetrahedra. Structurally, these tetrahedra have no shared copper atoms; however, there are strong antiferromagnetic (AFM) and ferromagnetic (FM) couplings between them, both within the complicated ribbons and between them. It has been established that both modifications are strongly frustrated 3D antiferromagnetics due to competition between the nearest AFM interactions along the edges of the Cu4 tetrahedra and competition between interactions and a multiplicity of long-range secondary AFM and FM interactions. Additionally, a large number of weaker long-range interactions are competing among each other. However, there is a possibility of the ordering Dzyaloshinskii-Moriya (DM) interaction in the centrosymmetric orthorhombic modification (Pnma), because two of the three types of magnetic ions, Cu1 and Cu3, are in the partial position 4c, where the ions are not related by the inversion center. In the triclinic modification (P −1) of Cu4O(As(P)O4)2, all four copper ions are in the centrosymmetric equivalent position 2i, which prevents DM interactions. This centrosymmetry will allow magnetic interactions in the triclinic modification of Cu4O(As(P)O4)2 to be still frustrated at lower temperature. It is possible that the triclinic modification of these compounds is a quantum spin liquid.
Torsional birefringence in metric-affine Chern-Simons gravity: gravitational waves in late-time cosmology
Authors: Boudet S. , Bombacigno F. , Moretti F. , Olmo Gonzalo J. 
Published: January 2023

Abstract
In the context of the metric-affine Chern-Simons gravity endowed with projective invariance, we derive analytical solutions for torsion and nonmetricity in the homogeneous and isotropic cosmological case, described by a flat Friedmann-Robertson-Walker metric. We discuss in some details the general properties of the cosmological solutions in the presence of a perfect fluid, such as the dynamical stability and the emergence of big bounce points, and we examine the structure of some specific solutions reproducing de Sitter and power law behaviours for the scale factor. Then, we focus on first-order perturbations in the de Sitter scenario, and we study the propagation of gravitational waves in the adiabatic limit, looking at tensor and scalar polarizations. In particular, we find that metric tensor modes couple to torsion tensor components, leading to the appearance, as in the metric version of Chern-Simons gravity, of birefringence, characterized by different dispersion relations for the left and right circularized polarization states. As a result, the purely tensor part of torsion propagates like a wave, while nonmetricity decouples and behaves like a harmonic oscillator. Finally, we discuss scalar modes, outlining as they decay exponentially in time and do not propagate.
Formation of hot spots around small primordial black holes
Authors: He Minxi , Kohri Kazunori , Mukaida Kyohei , Yamada Masaki 
Published: January 2023

Abstract
In this paper, we investigate the thermalization of Hawking radiation from primordial
black holes (PBHs) in the early Universe, taking into account the interference effect on
thermalization of high energy particles, known as Landau-Pomeranchuk-Migdal (LPM) effect. Small
PBHs with masses ≲ 109 g completely evaporate before the big bang
nucleosynthesis (BBN). The Hawking radiation emitted from these PBHs heats up the ambient plasma
with temperature lower than the Hawking temperature, which results in a non-trivial temperature
profile around the PBHs, namely a hot spot surrounding a PBH with a broken power-law tail. We find
that the hot spot has a core with a radius much larger than the black hole horizon and its highest
temperature is independent of the initial mass of the PBH such as 2 × 109 GeV × (α/0.1)19/3, where α generically represents the fine-structure
constants. We also briefly discuss the implications of the existence of the hot spot for
phenomenology.
Analysis of Liquid Inclination on the Absorption Performance of the Cavity-containing Coating
Authors: Liu Zhi-gang , Zhao Xian-wen , Li Qi , Chen Zhou , Wang Zheng-wei 
Published: January 2023

Abstract
During the submarine diving and rising, the coating may be damaged under the effect of alternating pressure of seawater, which may lead to the inflow of water into the cavity, while the liquid level of the cavity is not horizontal due to the cylindrical body of the submarine. For the influence of the liquid surface inclination on the sound absorption performance of the coating under the condition of water inflow, this paper firstly establishes a simplified analysis model, solves the sound reflection of the uniform layered medium based on the transfer function method, and then combines the finite element method to analyze the sound pressure field point. Finally, calculations and data processing are carried out to obtain the sound absorption coefficients. The results show that the inclination of the liquid surface causes the movement of the singularity of the absorption coefficient, and the frequency of the singularity moves to lower frequencies as the inclination angle of the liquid increases.
Experimental Study on the Cumulative Damage of Shipboard Structure Subject to Near-field Underwater Explosions
Authors: Chen Wenge , Cheng Lele , Yu Chao , Wu Haijun , Hang Fenglei , Wu Ziqi 
Published: January 2023

Abstract
To explore the cumulative damage law of near-field underwater explosions on the side of the ship structure, the multi-cabin model of the shipboard local structure is designed and applied to close-in underwater explosion experiments with different explosive masses and model conditions. The pressure load of the explosion shock wave near the water surface is obtained and analyzed. The damage results, such as the damage pattern of the model and the damage range of cabins, are acquired. The comprehensive comparison shows that: the secondary explosion on the side has a significant cumulative damage effect; the damage pattern of the structure is closely related to the proportional distance of the explosion. The damaged power of a single large charge explosion on the shipboard is bigger than the cumulative damage caused by two small explosions. The results of this study can provide a reference for the research on the damage and protection of the ship.
Experimental Study on Flow Characteristics of Large-scale Liquid Oxygen Delivery System
Authors: Ye Xin , Zhang Qing , Zhang Bangshuang , Zhang Lian , Zhang Ming 
Published: January 2023

Abstract
To deeply explore the flow law of the large-scale liquid oxygen delivery system, several liquid oxygen delivery tests have been conducted and measured. On this basis, the model of the pipeline characteristic of the liquid oxygen delivery system is constructed according to the hydrodynamic theory to obtain the relationship equation between the gas cushion pressure and liquid oxygen flow, and the frequency conversion model of the liquid oxygen pump is constructed according to the pump affinity laws to obtain the relationship equation between the liquid oxygen pump frequency, flow, and head. Under the working pressure limitation of the storage tank, liquid oxygen pump, and pipeline, the ultimate capacity of the liquid oxygen delivery system is calculated using the above models. This provides a database and theoretical basis for further optimization of liquid oxygen delivery process parameters and control strategies, as well as evaluation and exploitation of system performance potentials.
Frequency-enhanced triboelectric-electromagnetic hybrid generator integrated with multi-generation units for wind energy harvesting
Authors: Ye Hui , Sha Shujing 
Published: January 2023

Abstract
For a sustainable energy harvesting method, triboelectric nanogenerator (TENG) is becoming more and more important in natural wind energy harvesting. However, harvesting capacity of the TENG is affected by the low frequency of natural wind. To effectively harvest wind energy, a frequency-enhanced triboelectric-electromagnetic hybrid generator (FE-TEHG) is proposed, which integrates generation units. It contains a cam structure with six noses to increase the frequency of the wind. And in the generation units, the TENG module is integrated into the follower, and the electromagnetic generator (EMG) module is integrated into the driving part. Experiments proved that by increasing the input frequency, the output electrical signal of the TENG module becomes six times the original, and this integration method can greatly improve the output capacity of the generator. In the process of charging a 100 μF capacitor to 1.50 V, the charging speed of the FE-TEHG is 1.58 times that of the TENG module. In addition, when the wind speed is about 9 m/s, the FE-TEHG can light up 640 light-emitting diodes (LEDs) and supply power for a thermometer normally. Therefore, this paper provides a valuable method for frequency enhancement and integrated design of the TENG in wind energy harvesting.
Study on the sliding bearing of hot dip galvanized sinking roll
Authors: Chen Shangjun , Wang Wen , Wang Leizhen , Bai Yujian 
Published: January 2023

Abstract
As a key component in the hot-dip galvanizing production line, the sink roller ends of the sliding bearing is affected by the high-temperature zinc liquid corrosion wear, which leads to frequent stop for maintenance. The galvanizing industry is looking for more suitable material for bearing to prolong the service life. To improve the corrosion and wear resistance of the sliding bearing, the laser cladding method was used to prepare the cobalt-based and iron-based coatings on the surface of the superalloy. In this paper, the high-temperature zinc liquid corrosion wear test was carried out on the alumina ceramic bushing and three kinds of metal sleeves (316L stainless steel, cobalt-based alloy, and iron-based alloy). By comparing and analyzing the corrosion and wear conditions of the three metal sleeves after the test, the main failure mechanisms were comprehensively analyzed.
Analysis of the influence of clearance on bending stiffness of space deployable mechanism in the locked state
Authors: Wang Xinyuan , Shui Yongtao , Wang Chaozheng , Yin Dezheng , Ji Hongjuan 
Published: January 2023

Abstract
The future space station, which can simulate the gravity environment by rotation, has attracted the attention of scholars in recent years. It is considered a feasible scheme to fold the mechanism on the ground and assemble it into an artificial gravity ring after entering orbit. The deployable mechanism used to attach the space station is required to be large-scale and sufficiently high stiffness after deployment to ensure the safety and accuracy of the payload. However, the clearance will significantly reduce the stiffness of the mechanism, which is in the locked state. In this paper, the deployable mechanism with enhanced bending and torsion resistance configuration will be taken as the research object. First, based on the classical hinge stiffness model, the hinge equivalent model and the sliding joint equivalent model are proposed. Then, the finite element model based on equivalent stiffness is analyzed, and the effectiveness of the finite element model is verified by comparing the experimental results. Finally, the finite element model was used to analyze the influence of the clearance of the pin hole, the clearance of the sliding fit, and the position of the clearance on the bending stiffness of the deployable mechanism. The results show that the clearance greatly reduces the stiffness of the mechanism under small loads and weakens the bearing performance of components. At the same time, the position of the clearance should be taken seriously in the mechanism design.
Overall Strength Analysis of Floating Offshore Wind Turbine Foundation
Authors: Lin Jiang , Wu Wensong , Peng Zhongbo 
Published: January 2023

Abstract
The loads on the floating offshore wind turbine foundation are complex, and the evaluation of its overall structural strength is particularly important. This paper establishes a new type of semi-submersible floating wind power infrastructure finite element model based on the three-dimensional potential flow theory. The long-term forecast design wave method is used to carry out a long-term forecast of the wave load under the control parameters of the characteristic sections, with the wind pressure load superimposed and combined. Finally, the overall strength of the floating foundation under self-existing conditions is analyzed. The research shows that the max Von-Mises stress of the mid-transverse section is 115.6% higher than that of the mid-longitudinal section in the most dangerous state, and the overall strength of the structure meets the requirements of the standard. The high-stress areas appear at the connection between the lower floating body, including the cross brace and the column, while the max stress appears at the connection between the cross brace and the column supporting the wind turbine. Attention should be paid to such key parts in the detailed design stage of the floating foundation. The numerical analysis method and research conclusions can also provide a reference for the analysis and optimization of the same type of floating foundation.
Introductory Analysis of Spark Ignition Engine and Extensively Implemented Electric Alternatives
Authors: Wu Kefan , Zhou Chengxiao , Zhu Jiaqi , Zhu Yuqi 
Published: January 2023

Abstract
Energy crises and climate change lead to restricted standards of emission and energy consumption in regular road vehicles. Combustion method, ignition time, and injection time are engine development priorities. Optimal injection and ignition timing at 1600 rpm can save 10% on brake fuel. Perfect injection and ignition timing reduce heat loss and emissions. Various approaches to reducing transportation emissions and energy were implemented. Plug-in electric vehicles and hydrogen fuel cell vehicles (HFCV) were eliminated because of the lack of charging and refilling facilities. Mild hybrid energy recovery devices are considered straightforward and effective. Because of its effectiveness and longevity, Kinetic Energy Recovery System (KERS) is the most popular hybrid system in road automobiles. Future road energy recovery systems may include heat energy recovery methods and solar panels. However, electric vehicles with regenerative technologies own the highest energy efficiency among all the proposed solutions with the advantage of no pollution during the operation.
A review of arc stability analysis methods for aluminum alloy welding
Authors: Zhang Jiaxin , Gan Shiming , Liu Huaying 
Published: January 2023

Abstract
Aluminum alloy has become an essential war material for aerospace manufacturing, transportation manufacturing, and other fields for its superior thermal conductivity, corrosion resistance, and other strengths. In the aluminum alloy welding process, the stability of the arc can indicate the quality of the weld formation. This paper mainly reviews the probability density method, the principle of the approximate entropy method, and the analysis of aluminum alloy welding arc stability in the application. Analyzing the stability of the welding arc can help promote the improvement of welded joint quality and welding fabrication.
Effect of Pulse Duty Cycle and Oxidation Time on Microstructure and Properties of Micro-arc Oxidation Coatings on Ti6Al4V Alloy
Authors: Chen Yuke , Zhou Pengfei , Yuan Meini 
Published: January 2023

Abstract
Micro-arc oxidation (MAO) technology can in-suit generate coatings with high hardness and strong adhesion on the surface of titanium alloy, thereby greatly improve the application range of titanium alloy. The morphology and properties of coatings are controlled by changing electrical parameters such as duty cycle and oxidation time. This work mainly aims to study the influence of different duty cycles and oxidation times on MAO coatings microstructures and properties of Ti6Al4V alloy under the condition of constant voltage and pulse frequency. The scanning electron microscopy (SEM) and X-ray Diffractometer (XRD) were used to investigate into MAO coatings microstructure and phase composition. The roughness, porosity, thickness, and microhardness of MAO coatings were evaluated respectively by roughness tester, thickness gauge, and microhardness tester. The results show that surface morphology of the MAO coatings change from crater-like micropores to foam-like protrusions with the enhancement of duty cycle and oxidation time. When duty cycle is 50% and oxidation time is 30 min respectively, the ejection of the molten material made the MAO coating surface appear foam-like protrusions, and the surface morphology is seriously damaged. When the oxidation time and the duty cycle are 30 min and 10% respectively, the rutile phase intensity is the maximum, and further increasing the duty cycle will lead to a rutile phase decrease. In a limit range, the hardness rise with increase of oxidation time and duty cycle. The highest hardness is 668.85 HV.
Design and optimization of dry powder jet cleaning nozzles for airport navigation lights
Authors: Zhu Qiuhua , Ge Xiaohong , Gu Xiaobin , Li Hui , Wang Jinhuo , Zhang Zhiwen , Lv Fuheng 
Published: January 2023

Abstract
The research of this work is based on the nozzle design and optimization of dry powder (NaHCO3) jet cleaning system for airport navigation aid lamps. In this cleaning system, compressed air drives dry powder (NaHCO3) abrasive, and a gas-solid mixed high-speed jet is sprayed onto the surface of the luminaire through the nozzle to scour and clean the dirt attached to the surface of the luminaire. Based on the computational fluid dynamics and flow field theory, three types of nozzle structures, namely tapered nozzle, Laval nozzle, and flat nozzle, were studied; the DPM (Deformable part model) model in Fluent was used to analyze the internal and external flow fields of the nozzle mixed with the gas-solid two-phase flow to obtain the velocity field, pressure field and nozzle wear rate of the mixed gas, and the flat nozzle was selected and the nozzle parameters were optimized. The optimized level combination of flat type nozzle structure is obtained with a flat width of 4mm, flat height of 24.5mm, and flat length of 55mm.
Impact of electromechanical coupling of main drive system of cold rolling mill on amplitude-frequency characteristics
Authors: Jia Xingdou , Wang Shen , Yan Xiaoqiang , Hou Peng , Shao Huazhuang 
Published: January 2023

Abstract
Main drive mechanical system of a cold rolling mill was simplified to a three-inertia model, and natural frequency of mechanical system was obtained by using Matlab simulation. Combining the main motor speed control system and the mechanical system into an electromechanical coupling system, it was found that natural frequencies of mechanical components in coupled system are different from those of the independent mechanical system. The proportional control coefficient (P value) of the speed loop would affect amplitude of system at resonance point, whereas frequency of resonance point was rarely changed and the integral control coefficient (I value) almost had no effect on the amplitude-frequency characteristics. The notch filter whose limit frequency is the resonance frequency has the best vibration suppression effect. The load observer completely suppressed torsional vibration of motor but amplified torsional vibration of gears and rolls.