bluuebunny/crossref_metadata_2025_split huggingface dataset:
Photo-induced non-collinear interlayer RKKY coupling in bulk Rashba semiconductors
Authors: Asmar Mahmoud M , Tse Wang-Kong 
Published: August 2024

Abstract
The interplay between light-matter, spin-orbit, and magnetic interactions allows the investigation of light-induced magnetic phenomena that are otherwise absent without irradiation. We present our analysis of light-driven effects on the interlayer exchange coupling mediated by a bulk Rashba semiconductor in a magnetic multilayer. The collinear magnetic exchange coupling mediated by the photon-dressed spin-orbit coupled electrons of BiTeI develops light-induced oscillation periods and displays new decay power laws, both of which are enhanced with an increasing light-matter coupling. For magnetic layers with non-collinear magnetization, we find a non-collinear magnetic exchange coupling uniquely generated by light-driving of the multilayer. As the non-collinear magnetic exchange coupling mediated by the photon-dressed electrons of BiTeI is unique to the irradiated system and it is enhanced with increasing light-matter coupling, this effect offers a promising platform of investigation of light-driven effects on magnetic phenomena in spin-orbit coupled systems. In this platform, light properties, such as its intensity, can serve as external knobs for inducing non-collinear couplings of the interlayer exchange and for modulating the collinear couplings. Both of these effects signify the photo-generated modification in the spin textures of spin-orbit coupled electrons in BiTeI.
Investigating magnetic properties and Curie temperatures of FeX2 (X=S, Se, Te) monolayers
Authors: Özgür Mustafa , Pat Suat , Korkmaz Şadan 
Published: August 2024

Abstract
In recent years, there has been a growing interest in two-dimensional magnetic materials. With their unique properties and tunable characteristics, magnetic monolayers hold significant potential for the next-generation devices. This study employs the first principles calculations to examine the electronic, structural, and magnetic properties of the hexagonal and trigonal FeX2 (X=S, Se, Te) monolayers. The calculations show that only two configurations are dynamically stable which are hexagonal FeS2 and FeTe2. Both H-FeS2 and H-FeTe2 monolayers exhibit metallic behavior in PBE calculations. Furthermore, the results indicate that these monolayers also exhibit ferromagnetic behavior. This ferromagnetic ordering suggests significant interactions between the magnetic moments. The magnetic exchange constants are determined by using 2D Ising model. After determining the magnetic exchange constants, a Monte Carlo simulation is performed to obtain the Curie temperature. Furthermore, the influence of the Hubbard U parameter on the electronic and magnetic structure was also examined, revealing significant modifications in the band structure and magnetic moments. Additionally, magnetic exchange constants were calculated for the PBE+U case, as well as using the TB2J method, to provide a comprehensive understanding of the magnetic properties of the stable structures.
Unconventional photon blockade via two-photon absorption
Authors: Zhou Yan-Hui , Liu Tong , Zhang Xing-Yuan , Wu Qi-Cheng , Shi Zhi-Cheng , Yang Chui-Ping 
Published: August 2024

Abstract
The unconventional photon blockade, which relies on the physical mechanism of quantum interference, is primarily investigated using a general master equation, where a weak nonlinearity must be presented in the system to achieve photon antibunching. In this study, we explore the unconventional photon blockade using an alternative master equation known as the two-photon absorption master equation, which is derived from the system and environment interaction via two-photon absorption. Specifically, we find that the unconventional photon blockade can be triggered in two-coupled cavities, where each cavity interacts with a two-photon absorption environment. Different from unconventional photon blockade via the general master equation, we show that the two-photon absorption acts as the weak nonlinearity, and this photon blockade corresponds to a large average photon number. To derive optimal conditions for achieving this blockade, we propose a non-Hermitian Hamiltonian method to describe the mode loss caused by the two-photon absorption. In addition, we highlight the distinctions between our proposal and other approaches for generating single-photon states based on two-photon absorption.
Numerical simulation for fractional optimal control problems via euler wavelets
Authors: Turan Dincel Arzu , Tural-Polat Sadiye Nergis , Afacan Mustafa Oğuz 
Published: August 2024

Abstract
This paper suggests employing Euler wavelets to provide a precise and effective computational approach for certain fractional optimal control problems. The primary objective of the approach is to transform the fractional optimal control problem defined by the dynamical system and performance index into systems of algebraic equations, which then can be readily solved using matrix techniques. Since Euler polynomials are employed to build Euler wavelets and since Euler polynomials have fewer terms than most of commonly used other polynomials to build wavelets, employing them for the numerical approach results in sparser operational matrices. The speed of the recommended numerical method is improved due to the fewer terms in Euler wavelet operational matrices. We obtain the corresponding systems of algebraic equations for state variable, control variable, and Lagrange multipliers (used to determine the essential conditions of optimality) by incorporating operational matrices of Euler wavelets. Subsequently, those systems of algebraic equations are solved to obtain the numerical solution. The suggested method’s efficiency is demonstrated using a few typical examples. The suggested procedure is accurate and efficient, according to the results.
An Infrared Census of R Coronae Borealis Stars II—Spectroscopic Classifications and Implications for the Rate of Low-mass White Dwarf Mergers
Authors: Karambelkar Viraj R. , Kasliwal Mansi M. , Tisserand Patrick , Anand Shreya , Ashley Michael C. B. , Bildsten Lars , Clayton Geoffrey C. , Crawford Courtney C. , De Kishalay , Earley Nicholas , Hankins Matthew J. , Hall Xander , Lamberts Astrid , Lau Ryan M. , McKenna Dan , Moore Anna , Ofek Eran O. , Smith Roger M. , Soria Roberto , Soon Jamie , Travouillon Tony 
Published: August 2024

Abstract
We present results from a systematic infrared (IR) census of R Coronae Borealis (RCB) stars in the Milky Way, using data from the Palomar Gattini IR (PGIR) survey. RCB stars are dusty, erratic variable stars presumably formed from the merger of a He-core and a CO-core white dwarf (WD). PGIR is a 30 cm J-band telescope with a 25 deg2 camera that surveys 18,000 deg2 of the northern sky (δ > −28°) at a cadence of 2 days. Using PGIR J-band lightcurves for ∼60 million stars together with mid-IR colors from WISE, we selected a sample of 530 candidate RCB stars. We obtained near-IR spectra for these candidates and identified 53 RCB stars in our sample. Accounting for our selection criteria, we find that there are a total of

≈

350

−
100

+
150

RCB stars in the Milky Way. Assuming typical RCB lifetimes, this corresponds to an RCB formation rate of 0.8–5 × 10−3 yr−1, consistent with observational and theoretical estimates of the He-CO WD merger rate. We searched for quasi-periodic pulsations in the PGIR lightcurves of RCB stars and present pulsation periods for 16 RCB stars. We also examined high-cadenced TESS lightcurves for RCB and the chemically similar, but dustless hydrogen-deficient carbon (dLHdC) stars. We find that dLHdC stars show variations on timescales shorter than RCB stars, suggesting that they may have lower masses than RCB stars. Finally, we identified 3 new spectroscopically confirmed and 12 candidate Galactic DY Per type stars—believed to be colder cousins of RCB star—doubling the sample of Galactic DY Per type stars.
Magnetic shaping effects on turbulence in ADITYA-U tokamak
Authors: Singh Amit K. , Choudhary S. , Gopal Krishna M. , Mahapatra J. , Bokshi A. , Chowdhury J. , Ganesh R. , Hayward-Schneider T. , Lanti E. , Mishchenko A. , McMillan B.F. , Villard L. 
Published: August 2024

Abstract
The work reported in this paper addresses two aspects. In the first part, numerical simulations are conducted to examine the impact of magnetic equilibrium shaping (elongation and triangularity), on both conventional Ion Temperature Gradient (ITG) modes and Short Wavelength ITG modes. This analysis is performed considering the experimental profiles and parameters of the ADITYA-U tokamak, employing the nonlinear global gyrokinetic Particle-in-Cell code ORB5. The linear and nonlinear collisionless electrostatic simulation of these modes are carried out with kinetic ions and adiabatic electrons. From the linear results, it has been observed that the magnetic equilibrium shaping slighty reduced the growth rates and widened the spectrum, and the maxima of growth rate curve is shifted to higher toroidal wave number. We find that the heat flux is reduced by a significant

≃

35
%

for the true circular magnetohydrodynamic magnetic equilibrium as compared to ad hoc concentric circular equilibrium reported in Singh et al (2023 Nucl. Fusion
63 086029). A further

≃

10
%

reduction in the heat flux is seen with magnetic equilibrium shaping. In the second part, linear collisionless electrostatic simulation studies of ITG coupled with fully kinetic electrons (both trapped and passing electrons are treated kinetically) using a drift-kinetic ordering is performed. It can be seen from the linear results that, in presence of kinetic electrons, the growth rate and real frequency of the ITG mode are increased significantly for ADITYA-U parameters and a mode propagating in the electron diamagnetic direction is identified at high toroidal wavenumbers.
Formation of high areal density core using an efficient and robust implosion method for fast ignition
Authors: Nagatomo H. , Johzaki T. , Takizawa R. , Fujioka S. 
Published: August 2024

Abstract
A new fuel compression method for a fast ignition scheme is discussed. To form a high areal density fuel plasma for the ignition condition, homogenous isentropic compression (HIC) with solid spherical target is effective. We improve a multi-step pulse shape method that uses progressive shockwaves and reflected shockwaves for the compression, where a precisely controlled step-pulse laser drives the shockwaves to compress the fuel and suppress entropy increase. Another advantage of this approach is the relatively smooth high dense fuel is distributed at maximum compression time, compared to our previous design based on Kidder’s HIC method. In addition, we insert a power dip as a preconditioning before the last pulse step to reduce the electron and ion temperature near critical density. As a result, an optimum implosion is designed using 245 kJ of implosion laser energy to meet the ignition condition.
Optimal design of low frequency rubber vibration isolator
Authors: Li Xinyu 
Published: August 2024

Abstract
Low frequency vibration isolator is a common structure vibration control device, widely used in transportation and machinery manufacturing fields. This paper is centered around enhancing the optimization design of rubber isolators operating at low frequencies. In the initial section, the paper introduces the structural framework and operational principles of rubber isolators. Furthermore, it delves into the analysis of their significance and potential applications within engineering contexts. Subsequently, the paper narrows its focus to address the design challenges concerning rubber isolators with low-frequency capabilities. A comprehensive three-dimensional model is constructed using ANSYS software, employing finite element analysis techniques. The paper employs a multi-objective optimization algorithm through a direct optimization module to facilitate the optimization design process. Within this study, the NSGA-II algorithm was employed to drive the optimization of design, with the objective of achieving a 10 Hz frequency for a series of dual rubber isolators, while simultaneously constraining static deformation to within 8 mm. The outcomes of this investigation emphasize the successful attainment of optimization goals by meticulously fine-tuning the structural dimensions of the isolators.
Research on the path of low-carbon construction of multimodal logistics parks under the background of “carbon peak” and “carbon neutrality”
Authors: Liu Yajie , Chen Ningning , Cui Weihua , Zhuang Qingxu 
Published: August 2024

Abstract
The construction of intermodal logistics parks in China is developing rapidly, but most of them are in the bad mode of high energy consumption. While polluting the environment, it also affects the cost reduction and efficiency of the whole logistics industry, which is not conducive to the healthy development of the logistics industry. Therefore, under the goals of “carbon peak” and “carbon neutral”, the planning of multimodal logistics parks must seek the development path of low-carbon transformation. This is not only a responsibility, but also a necessary path for the healthy and sustainable development of the logistics industry in the future, which has far-reaching strategic significance. Therefore, based on this background, the paper describes the opportunities and challenges of low-carbon construction of China’s multimodal logistics parks. According to the above analysis, combined with the relevant policies, it puts forward the low-carbon construction path of multimodal logistics parks. It is intended to provide support for the promotion of low-carbon construction of multimodal logistics parks and help the practice of the “carbon peak” and “carbon neutral” strategic goals in practice.
Structural design of a novel rotary platform 3D printer
Authors: Liu Shengrui 
Published: August 2024

Abstract
Stair-stepping defects in 3D printing processes can be caused by various reasons, such as the quality of the printing material, the position of the print head, printing speed, printing temperature, and so on. To improve the issue of stair-stepping effects in thin-walled revolving parts during the 3D printing process, this project aims to design a 3D printer that enables the print head to move in the X, Y, and Z axes while the heated bed platform can rotate. This will significantly reduce the stair-stepping effect’s impact and greatly enhance the printing’s quality and accuracy.
A prediction method for salt frost resistance of carbon-glass mixed fiber concrete based on improved BP neural network
Authors: Wu Yang , Huang Shenjiang 
Published: August 2024

Abstract
Low temperature and freeze-thaw can greatly reduce the service life of concrete, leading to serious safety hazards. Salt frost resistance is one of the important characteristics of concrete. Therefore, in order to more accurately evaluate the salt frost resistance of carbon glass hybrid fiber reinforced concrete. This article proposes a prediction method using measured data based on an improved BP neural network. Firstly, conduct freeze-thaw cycle tests on fiber reinforced concrete with different proportions. Studied the variation law of concrete quality loss rate and dynamic elastic modulus. Then, based on BP neural network and particle swarm optimization algorithm, a salt frost damage prediction model for carbon glass hybrid fiber reinforced concrete was established. Finally, conduct optimization based on the learning samples and compare and analyze the prediction errors of the model. The simulation results demonstrate that the proposed method has good accuracy and stability.
Effectively planning waterfront public place affected by the ecological environment
Authors: Wang Jing 
Published: August 2024

Abstract
Urban waterfront area planning is a very important part to improve the quality of the urban ecological environment. Research effective planning paths of urban waterfront guided by ecological environment effect can promote landscape diversity index and other indicators are selected as the relevant indicators of the ecological environment which establish comprehensive evaluation index system of urban waterfront public place planning path. Use the fuzzy statistical path to determine the evaluation index weight, establish the waterfront public place planning path evaluation model according to the waterfront public place planning evaluation index weight, and use the model evaluation results to determine the effective planning paths of urban waterfront guided by the ecological environment effect. The experimental results show that the evaluation score of urban waterfront planning path 2 is the highest, which verifies that planning path 2 is an effective planning path of waterfront public places guided by considering the ecological and environmental effects.
Impact of drought on vegetation over inner Mongolia autonomous region
Authors: Zhang Ziti 
Published: August 2024

Abstract
In recent years, remote sensing technology has become an important tool for monitoring vegetation changes in semi-arid regions. By using data collected by satellites to calculate vegetation indices, researchers can track changes in vegetation density and productivity over time. This can help identify areas of potential desertification or degraded land degradation and develop management strategies to restore degraded ecosystems. The objectives of this paper are to use multi-temporal MODIS data to extract vegetation distribution characteristics and dynamics in Inner Mongolia Autonomous Region. This study summarized the rainfall data of Inner Mongolia Autonomous Region from 2000 to 2019, and found the driest year 2001 and the wettest year 2012. The NDVI data of 4 districts of Xingan League in 2001 and 2012 were selected for analysis, and the average NDVI value and standard deviation of the 4 districts were obtained. NDVI data was combined with elevation data and vegetation data for analysis. The relationship between precipitation and NDVI is helpful to understand the impact of drought on vegetation in Inner Mongolia and provide reference for regional environmental management.
Technology of High-k/Metal-Gate Stack
Authors: Wang Mingshi 
Published: August 2024

Abstract
The High-k/Metal-Gate Stack (HKMG) technology represents a seminal advancement in semiconductor fabrication, predicated upon the substitution of SiO2 with high-k dielectric materials, coupled with the integration of metal gate materials. This technological paradigm shift has emerged as a transformative response to the intricate challenges encountered within the semiconductor industry, a sector perpetually engaged in the relentless pursuit of diminishing the critical dimensions of semiconductor devices. Issues such as increased power leakage, enhanced parasitic capacitance, and the escalating complexity of gate insulators have impeded the sustainable downscaling of traditional silicon dioxide-based devices. These challenges have necessitated a comprehensive re-evaluation of the materials and processes involved in semiconductor manufacturing, leading to the conception and evolution of the HKMG technology. This article’s analysis of the developmental trajectory of HKMG technology reveals a progression marked by the systematic exploration of alternative high-k dielectric materials, rigorous compatibility assessments with metal gate materials, and the concurrent refinement of manufacturing processes to ensure seamless integration. After that, elucidating the impediments encountered during its evolution and expounding upon the corresponding ameliorative measures instituted. Looking ahead, ongoing research focusing on the synthesis of advanced high-k dielectric materials, and the development of novel metal gate materials with superior compatibility to further enhance device performance and functionality makes HKMG technology a huge prospect. Such advancements are paving the way for the realization of more powerful, energy-efficient, and compact electronic devices.
The development of cloaking techniques based on phase-modulated metasurfaces
Authors: Yang Ganyu 
Published: August 2024

Abstract
More and more attention has been paid to explore the application background of cloaking techniques based on phase-modulated metasurfaces, which play an important role in modern engineering and military applications. Phase-modulated metasurfaces are an emerging field of research that explores how the propagation of electromagnetic waves can be manipulated by precisely controlling the phase on tiny elements. These tiny elements, usually nanoscale structures, are arranged on the metasurface to precisely control the propagation and scattering of electromagnetic waves in a specific frequency range. The thesis first reviews the development of metamaterial cloaking technology, introduces the realization of several mainstream metamaterial cloaking technologies, and points out the benefits of cloaking techniques based on phase-modulated metasurfaces compared with other cloaking technologies. Then the development history of cloaking techniques based on phase-modulated metasurfaces is introduced through four key time nodes. We can find that phase-modulated metasurfaces are not only getting thinner and thinner, but in addition to the stealth effect, i.e., the reduction of the RCS (Radar Cross Section), phase-modulated metasurfaces can also simulate different virtual shapes. Finally, the development and research progress of cloaking techniques based on phase-modulated metasurfaces are summarized, and personal opinions on its future development are put forward. This paper summarizes the advances in the field of phase-modulated metasurfaces over the last decade and presents some representative approaches to phase-modulated metasurfaces at various points in time, which can help readers better understand the field of metasurfaces and metamaterials.
Design and application of a radar target simulator
Authors: Zhou Hao , Xu Shujun , Xiong Feng , Tang Ying 
Published: August 2024

Abstract
To fulfill the need for debugging boundary scenes in radar data processing development, this paper proposes a simulator design method for the editing and simulation of diverse combat scenes as required. The simulator was developed based on the VPX platform, including external control equipment, resource scheduling, beam control, target simulation, and data processing. The motion model is based on linear and circular models, the clutter model algorithm is the zero memory nonlinear transformation method based on K distributions, and the noise model is designed as Gaussian white noise, characterized by a probability distribution in the Gaussian distribution and a constant power spectrum. The generated plots are condensed, and their quality is calculated, for which the rate of plot rejection can reach more than 50% by controlling the feature elements. Finally, the simulated target trajectory is visually verified through Matlab.