bluuebunny/crossref_metadata_2025_split huggingface dataset:
Large-scale and tunable transparent displays based on silver nanoparticles metasurface
Authors: Chu Bo , Li Yan , Qin Yiheng , Hu Taozheng , Zhong Facheng , Zeng Fanguang , Ding Pei , Shao Li , Du Yinxiao , Tian Shuo , Chen Zhuo 
Published: May 2023

Abstract
We report a transparent display based on a metasurface of silver nanoparticles (Ag NPs), consisting of a transparent substrate and a layer of Ag NPs deposited by a dielectric film. The Ag NPs metasurface is prepared by a simple and direct annealing process. It presents a deep transmission valley at the wavelength of λ = 468 nm and enables desired transparent display by projecting the monochromatic image onto the metasurface. We also demonstrate that the formed Ag NPs can be approximated as truncated nanospheres, which have obvious directional scattering properties, and can radiate most of the scattered energy into the backward hemisphere with a relatively large angular beamwidth (the full width at half maximum of the scattered intensity) of ∼90°. Therefore, the fabricated displays possess wide viewing angles and high brightness characteristics. Additionally, the transmission modes can be red-shifted to the wavelength of λ = 527 nm by controlling the thickness of the deposited dielectric film. This approach using traditional thin film deposition and moderate annealing processing techniques enables simple, low-cost, and scalable fabrication in large areas for transparent displays.
Transmission of electromagnetic waves from a plasma globe to a light emitting diode
Authors: Helseth L E 
Published: May 2023

Abstract
When introducing students to the topic of energy transported by the electromagnetic field, it is sometimes helpful if both the transmission and reception of signals can be visualized. Here the use of a plasma globe as transmitter and light emitting diode as receiver is described, and how this setup may be used to initiate discussions on central topics of electromagnetic wave propagation.
Regurgitation during the fully supported condition of the percutaneous left ventricular assist device
Authors: Yin Anyun , Wen Biyang , Cao Zijian , Xie Qilian , Dai Ming 
Published: May 2023

Abstract

Objective. A percutaneous left ventricular assist device (PLVAD) can be used as a bridge to heart transplantation or as a temporary support for end-stage heart failure. Transvalvularly placed PLVADs may result in aortic regurgitation due to unstable pump position during fully supported operation, which may diminish the pumping effect of forward flow and predispose to complications. Therefore, accurate characterization of aortic regurgitation is essential for proper modeling of heart-pump interactions and validation of control strategies. Approach. In the present study, an improved aortic valve model was used to analyze the severity of regurgitation produced by different pump position offsets. The link between pump position offset degree and regurgitation is validated in the fixed speed mode, and the influence of pump speed on regurgitation is verified in the variable speed mode, using the mock circulatory loop (MCL) experimental platform. Main results. The greater the pump offset and the more severe the regurgitation, the more carefully the pump speed needs to be managed. To avoid over-pumping, the recommended pump speed in this study should not exceed 30 000 rpm. Significance. The modeling approach provide in this study not only makes it easier to comprehend the impact of regurgitation events on the entire interactive system during mechanical assistance, but it also aids in providing timely alerts and suitable management measures.
Particle-in-cell modeling of electron beam generated plasma
Authors: Rauf Shahid , Sydorenko D , Jubin S , Villafana W , Ethier S , Khrabrov A , Kaganovich I 
Published: May 2023

Abstract
Plasmas generated using energetic electron beams are well known for their low electron temperature (T
e) and plasma potential, which makes them attractive for atomic-precision plasma processing applications such as atomic layer etch and deposition. A 2-dimensional particle-in-cell model for an electron beam-generated plasma in argon confined by a constant applied magnetic field is described in this article. Plasma production primarily occurs in the path of the beam electrons in the center of the chamber. The resulting plasma spreads out in the chamber through non-ambipolar diffusion with a short-circuiting effect allowing unequal electron and ion fluxes to different regions of the bounding conductive chamber walls. The cross-field transport of the electrons (and thus the steady-state characteristics of the plasma) are strongly impacted by the magnetic field. T
e is anisotropic in the electron beam region, but low and isotropic away from the plasma production zone. The plasma density increases and the plasma becomes more confined near the region of production when the magnetic field strengthens. The magnetic field reduces both electron physical and energy transport perpendicular to the magnetic field. T
e is uniform along the magnetic field lines and slowly decreases perpendicular to it. Electrons are less energetic in the sheath regions where the sheath electric field repels and confines the low-energy electrons from the bulk plasma. Even though electron and ion densities are similar in the bulk plasma due to quasi-neutrality, electron and ion fluxes on the grounded chamber walls are unequal at most locations. Electron confinement by the magnetic field weakens with increasing pressure, and the plasma spread out farther from the electron beam region.
On the photoresponse regulations by deep-level traps in CsPbBr3 single crystal photodetectors
Authors: Li Fangpei , Peng Wenbo , Zhang Xin , Hao Yingying , Bai Ruichen , Sun Qihao , Liu Xin , Jie Wanqi , Xu Yadong 
Published: May 2023

Abstract
The all-inorganic halide perovskite CsPbBr3 has attracted significant attention owing to its excellent opto-electronic properties. However, deep-level traps within the material are significant for the properties of CsPbBr3 based opto-electronic devices. In this study, the effects of deep-level traps on the photoresponse characteristics of CsPbBr3 photodetectors were thoroughly studied. By tailoring the illumination combinations where 532 nm light emitting diode (LED) illumination corresponds to the band-to-band excitation of photo-carriers and 648 nm LED illumination corresponds to sub-band excitation by the deep-level traps, it is proven that the device photoresponse performance is improved by the existence of deep-level traps. The photoresponsivity was enhanced by ∼63.64% (from 0.44 to 0.72 A W−1) under 3.18 μW cm−2 532 nm LED illumination. The rise/fall time was reduced by 21.95% (from 20.5 to 16.0 ms)/25.47% (from 21.2 to 15.8 ms). The underlying physical mechanisms of deep level trap-induced modulations on the photoresponse performance of the CsPbBr3 photodetector were revealed and discussed. By further systematic simulation of the effects of material properties on the photoresponse regulation, it was concluded that a shorter carrier lifetime, higher carrier mobility, higher trap concentration, and deeper trap level could improve the photoresponse of the CsPbBr3 photodetector. This study aims to clarify the physical relation between material properties and device performance and provide guidance for high-performance CsPbBr3 photodetector design.
A thermal load identification method based on physics-guided neural network for honeycomb sandwich structures
Authors: Du Wenqi , Yang Lekai , Lu Lingling , Le Jie , Yu Mingkai , Song Hongwei , Xing Xiaodong , Huang Chenguang 
Published: May 2023

Abstract
The identification of thermal load/thermal shock of aircraft during service is beneficial for collecting information of the service environment and avoiding risks. In the paper, a method based on multivariate information fusion and physics-guided neural network is developed for the inverse problem of thermal load identification of honeycomb sandwich structures. Two thermal feature parameters: temperature gradient and temperature variation rate are used to build the dataset. A 16-layers physics-guided neural network is presented to achieve the predicted results consistent with physical knowledge. In the work, laser irradiation is used as the thermal load, and two laser parameters are to be identified, i.e. spot diameter, power. Simulations and experiments are conducted to verify the effectiveness of the proposed method. The effects of physics-guided loss function and multivariate information fusion are discussed, and it is found that the results based on the proposed method are much better than the results based on the method without physical model. Besides, results based on multivariate information fusion are better than results based on single temperature response. Then, the effects of network models and hyper parameters on the proposed method are also discussed.
Superfluidity from correlations in driven boson systems
Authors: Mateos Jesús , Creffield Charles E , Sols Fernando 
Published: May 2023

Abstract
We investigate theoretically the superfluidity of a one-dimensional boson system whose hopping energy is periodically modulated with a zero time average, which results in the suppression of first-order single-particle hopping processes. The dynamics of this Floquet-engineered flat-band system is entirely driven by correlations and described by exotic Hamiltonian and current operators. We employ exact diagonalization and compare our results with those of the conventional, undriven Bose–Hubbard system. We focus on the two main manifestations of superfluidity, the Hess-Fairbank effect and the metastability of supercurrents, with explicit inclusion of an impurity when relevant. Among the novel superfluid features, we highlight the presence of a cat-like ground state, with branches that have opposite crystal momentum but carry the same flux-dependent current, and the essential role of the interference between the collective components of the ground-state wave function. Calculation of the dynamic form factor reveals the presence of an acoustic mode that guarantees superfluidity in the thermodynamic limit.
Investigation of stability for Cs2TiBr6 perovskite materials exposed to air environment
Authors: Lapa Havva Elif , Çalık Adnan , Kaleli Murat , Aldemir Durmuş Ali 
Published: May 2023

Abstract
Lead-free all-inorganic Cs2TiBr6 perovskite solar cells have attracted attention with their 3.3% efficiency and stability. However, instability in air ambiance has been reported for Cs2TiBr6 synthesized in powder form. In this work, Cs2TiBr6 perovskite is synthesized using a solution-based method. Time-dependent x-ray diffraction patterns are analyzed for air ambience. Cs2TiBr6 perovskite quickly deteriorates and decomposes in the air. Morphology and optical properties are obtained using a scanning electron microscope and the ultraviolet region, respectively. The average particle size is ∼2.4 μm. The forbidden band gap is found to be 1.82 eV from the Tauc plot. The Hall Effect measurement of the perovskite pellet is taken at room temperature and under vacuum. The pellet has high resistivity (1.1 × 104 ohm·cm) and high Hall mobility (502 cm2V−1s−1). Cs2TiBr6 shows p-type conductivity. Low stability to air and high resistivity are handicaps for the Cs2TiBr6 perovskite absorber layer in solar cell applications.
A receipt-free quantum voting protocol based on quantum public key encryption and quantum key agreement
Authors: Ke Weiyang , Shi Run-hua , Yu Hui , Xu Xiaotong 
Published: May 2023

Abstract
To better protect the privacy of voters, a receipt-free quantum voting protocol is first proposed, which adopts quantum key agreement and quantum public key encryption with single photons. We employ Lagrange interpolation polynomials and random numbers to blind the voting information on the bulletin board, so that it can minimize the public information. Furthermore, our receipt-free quantum voting protocol is information-theoretically secure, i.e., the eavesdropper cannot get any voting information by collecting both the quantum ciphertext and the public information. In addition, compared with the existing quantum voting protocols, our protocol can meet more security attributes, such as anonymity, unrepeatability, verifiability legitimacy and especially, receipt-freeness.
Magnetic impurity inducing local defect of polarization and depletion of magnetization in magnetic cluster: blended ferron formation
Authors: Jipdi M N , Dongmo M Z , Fai L C , Tchoffo M 
Published: May 2023

Abstract
This paper presents a blended ferron in a ferromagnetic cluster where the electric polarization and magnetization tailor the quasi-particle characteristics. The resulting quasi-particle has coupled acoustic-polaron and ferron characteristics. The constant competition between electric polarization and magnetization alters the effective mass thereby reducing the global inertia of the quasi-particle. The impurity significantly affects the environment, and the resulting defects in the polarization and magnetization are soliton-like. It was observed that any gain in electric polarization is conveyed by a drop in magnetization, where the hybridization of magnetization and polarization gives rise to a new quasi-particle concept: a blended ferron. The latter is manifested by the local deformation of the electric polarization and depletion of the magnetization in the cluster’s signature of magnetic reordering.
Relativistic effects in ionization of heavy hydrogen-like ions by short x-ray pulses
Authors: Novak O , Diachenko M , Kholodov R 
Published: May 2023

Abstract
The probability of photoionization of a heavy hydrogen like ion is calculated within the relativistic perturbation theory. The Coulomb potential of a heavy nucleus is taken into account accurately by usage of the corresponding solutions of the Dirac equation. The obtained probability is compared with both nonrelativistic limit and with nonperturbative results based on the numerical solution of the time-dependent Dirac equation. Suppression of ionization is observed in the secondary ionization channel at photon frequency of about ℏ
ω ≈ mc
2.
Optimistic multigranulation roughness of fuzzy bipolar soft sets by soft binary relations and its applications
Authors: Mubarak Asad , Mahmood Waqas , Shabir Muhammad 
Published: May 2023

Abstract
Two important mathematical methods for addressing uncertainty in data processing are multigranulation rough set (MGRS) and fuzzy bipolar soft set (FBSS). This paper describes a certain kind of multigranulation rough set in the context of multiple soft binary relations. We first define the multigranulation roughness of fuzzy bipolar soft sets in the two universes. Moreover, a detailed study of structural properties has been conducted in order to explore this concept. The key characteristics of the traditional MGRS model are completely preserved in this new approach. Following that, we suggest two decision-making algorithms with respect to aftersets and foresets of the soft binary relations over dual universes. This approach appears to be better suited and more adaptable than other available methods, making it a favorable option for addressing decision-making problems. Finally, we provide a practical application of the suggested approach to a real-world problem.
Chirp characteristics and the effect of chirp on the beam quality of laser pulses propagating upwards in the atmosphere
Authors: Zhang Gan , Ji Xiaoling 
Published: May 2023

Abstract
The chirp characteristics and the effect of chirp on the beam quality of laser pulses propagating from the ground through the atmosphere to the space orbit are studied. The analytical expressions of the additional chirp caused by group-velocity dispersion (GVD) and self-focusing effects in the atmosphere are derived, respectively. It is shown that the behavior of the additional chirp caused by GVD effect is quite different from that caused by self-focusing effect. On the other hand, it is found that there exists a minimum of pulse width on the target when a certain negative initial chirp arrives. In particular, it is demonstrated that the beam quality on the target can be optimized (i.e., the target intensity can be improved and the temporal pulse splitting on the target can be avoided) by the preliminary chirp method.
Key technologies of dynamic simulation and design for large caliber truck-mounted artillery
Authors: Shan Chunlai , Gu Bin , Liang Hui , Liu Pengke , Ning Bianfang 
Published: May 2023

Abstract
Large caliber truck-mounted artillery is a popular weapon developed and equipped in recent years because of its advantages of low cost, high mobility and strong firepower. However, in the firing process of vehicle mounted artillery, it is bound to face the problems which traditional towed artillery or tracked self-propelled artillery does not have. Taking a large caliber truck-mounted artillery as object, a whole artillery dynamics virtual prototype is established and three key technologies of dynamics simulation are studied, which are the influence of turret race waggling on the force of elevating equilibrator and other mechanisms, the top-down optimization design method of the spade, and the influence of tire support on firing stability. The results show that the turret race shaking will directly affect the force magnitude and even direction of the elevating mechanism, and the influence of the angular acceleration of the rotating part given by the turret race shaking needs to be considered; In order to achieve lightweight design, the design parameter of the mechanism such as the spade should be taken as the optimal value in combination with the firing stability of the gun. The traditional truck-mounted artillery usually does not take the driving system as the bearing structure during firing, but it is found that when the wheels land and provide a certain proportion of support force, it is helpful to maintain the vehicle body position. The research can provide reference to the dynamic simulation and design technology of related vehicle weapons.
Study on Flame Retardancy of Enamelled Wires Using a Cone Calorimeter
Authors: Wang K , Kong GQ , Shao M , Yu QB , Yang RJ 
Published: May 2023

Abstract
The flame-retardancy of enamelled wires was studied by using a cone calorimeter. The characteristic parameters including time to ignition, heat release rate, total smoke release and so on, were obtained. The effect of heat radiation flux on the flame retardancy was analyzed. The results show that the flame retardancy of enamelled wires is related to the content of different components in the composite insulation layer. Polyimide enamelled wires have good flame retardant performance, followed by corona resistant wire with filler, and ordinary polyamide imide composite polyester imide enamelled wire has poor flame retardant performance. In conclusion, the heat release rate measured by cone calorimeter can be used for evaluate the flame retardancy of enamelled wires and provide a reference for the development and application of flame retardant enamelled wires.
Influence of Rupture Size on Dispersion Characteristics of Propellant Particles During Ignition and Flame Spreading Processes for Modular Charges
Authors: Yang Xuguang , Yu Yonggang 
Published: May 2023

Abstract
During ignition and flame spreading processes, the difference in initial rupture size for the end cover of cartridge may affect the final accumulation form of propellant particles. A 3D unsteady state gas -solid two-phase flow model was established based on the gas phase-grain phase coupling method to simulate the final distribution of propellant particles in the chamber under different initial rupture sizes for end cover. The simulation results showed that at the fan-shaped initial perforation area for end cover of modular cartridge, under the 6 simulated working conditions of central angles 0, 30, 60, 90, 120 and 150 degrees, the propellant particles in the chamber presented a combined form of gentle slope accumulation, horizontal accumulation, and steep slope accumulation from the primer side to the pressure control diaphragm side. When the central angle corresponding to the fan-shaped initial perforation area increased from 0 ° to 150 °, the axial length for gentle slope accumulation and horizontal accumulation increased from 269 mm to 331 mm, and for the part of horizontal accumulation, the average thickness of propellant particles increased from 18.1 mm to 23.5 mm, and the proportion of steep slope accumulation of propellant particles decreased from 70.3% to 63.8%. The larger the initial rupture size for the end cover, the longer the axial length of gentle slope and horizontal accumulation, the thicker the average grain thickness for the part of horizontal accumulation, and the lower the proportion of steep slope accumulation of propellant particles.
Key Technology Research of Autonomous Attack Tactical Missile
Authors: Jiao Y J , Zhao J M , Zhou J , Wang S Q , Nie C , Nan X M 
Published: May 2023

Abstract
The autonomous attack tactical missile is not only an important development direction of the army’s precision strike equipment in the future, but also the only way to achieve spanning development of the army’s anti-tank missiles. With the advancement of technological progress, the technical breakthroughs made in the fields of multi-source information fusion, autonomous identification, autonomous guidance and controllable damage will be directly applied to the autonomous attack tactical missile to realize autonomous attack. They will lead the army’s equipment to develop from informatization to autonomy and intelligence. Through the combat capacity design for autonomous attack tactical missiles, we put forward the three-ring design method, constructed the combat capacity support elements, sort out the main technical characteristics of autonomous attack level by level, summarized the key technologies from “reconnaissance-strike-evaluation”, the all-element kill chain of autonomous attack, and proposed solutions that may represent the future development direction based on the current research status at home and abroad.
Numerical study on the propagation characteristics of rotating detonation waves in a ramjet engine
Authors: Feng W K , Zheng Q , Xiao Q , Weng C S 
Published: May 2023

Abstract
The rotating detonation ramjet engine (RDRE) is a new-generation aero-engine with tremendous potential. In order to reveal the characteristics of the wave system in RDRE and study the propagation characteristics of the rotating detonation wave (RDW), a three dimensional numerical simulation on a simplified model of RDRE was performed with premixed ethylene/air mixture. The results show that an upstream oblique shock wave (UOSW) is induced by the RDW. It then weakens gradually as propagating upstream and merges with the circumferential tilted normal shock wave (NSW). The UOSW near the outer wall propagates faster upstream, whereas the position of the NSW on the inner and outer walls is almost coincident during the process of propagating downstream. The periodic fluctuations of the pressure peaks and the propagation speed of the RDW were observed, and the irregular pre-combustion occurs near the contact surface. The results also indicate that a sustainable dynamic balance of the periodic fluctuation in the intensity of RDW is formed in the RDRE. The irregular pre-combustion causes the irregular fluctuation of the pressure peaks near the contact surface. The UOSW propagates upstream much faster than the NSW propagating downstream, and the estimated ratio of the circumferential range effected by UOSW to the circumferential range effected by NSW is about 1: 5.