bluuebunny/crossref_metadata_2025_split huggingface dataset:
A bridgeless configured asymmetrical alternating current–direct current converter‐based isolated single‐stage electric vehicle battery charger with supply side power factor enhancement
Authors: Shukla Tanmay , Baig Mirza Jawad , Ahirwar Kaushal Kishor , Raghuwanshi Anchal , Ansari Aftab Ahmed , Adhikari Apsara 
Published: December 2023

AbstractAn approach is presented to employ two different types of converters in bridgeless configuration for supply side power factor enhancement of the system. The isolated single‐stage electric vehicle battery charger uses two different converters in a bridgeless configuration to extract the advantages of both converters for supply‐side power factor enhancement. For the negative and positive semi‐cycles of the supply voltage, the power factor‐enhanced asymmetrical alternating current–direct current converter utilises a fourth order single‐ended primary‐inductor converter and a second order buck‐boost converter, respectively. The use of single‐ended primary‐inductor converter and buck‐boost converter in bridgeless configuration reduces the net order of the system with respect to conventional bridgeless‐single‐ended primary‐inductor converter schemes. The buck‐boost converter also needs the supply‐side filter to eradicate the unwanted harmonics in the supply current which increases the order of the system. The usage of both converters presents many benefits like input inductance of the single‐ended primary‐inductor converter can be utilised as a filtering element with a capacitor for the buck‐boost converter. The anti‐parallel diode conduction operation of both switches facilitates the elimination of extra reverse feed diodes (generally used in bridgeless schemes). The single‐stage charger itself comes with the benefit of elimination of extra stages and thus the losses associated with it. The presented charger also witnesses the elimination of the rectifier due to usage of bridgeless configuration. The isolated single‐stage electric vehicle battery charger is also garnished with electrical isolation which adds to the safety standard of the system. To attain power factor enhancement, the asymmetrical alternating current–direct current converter functions in discontinuous current conduction mode in the present work. The elimination of extra‐stages (with respect to two stage charger), a filter, a rectifier, two extra reverse‐feeding diodes, one voltage sensor, one current sensor (with respect to continuous current conduction mode), and electrical isolation not only makes the system compact and safer but also makes the system cheaper. Elaborated mathematical modelling and stability analysis of the presented alternating current–direct current converter using a pole‐zero map and bode plot have been included in the article. The prototype and MATLAB/Simulink model of isolated single‐stage electric vehicle battery charger system with discontinuous current conduction mode control has been built and results of both prototype and MATLAB/Simulink are deployed to verify isolated single‐stage electric vehicle battery charger system's performance during dynamic and steady‐state conditions.
Detection of decayless oscillations in solar transition region loops
Authors: Gao Yuhang , Hou Zhenyong , Van Doorsselaere Tom , Guo Mingzhe 
Published: December 2023

Context. Decayless kink oscillations have been frequently observed in coronal loops, serving as a valuable diagnostic tool for the coronal magnetic field. Such oscillations have never before been reported in low-lying loops of the transition region (TR).
Aims. The aim of this study is to detect decayless kink oscillations in TR loops for the first time.
Methods. We used the SI IV 1400 Å imaging data obtained from the Interface Region Imaging Spectrograph. We applied the Multiscale Gaussian Normalization method to highlight the TR loops, and generated time–distance maps to analyse the oscillation signals.
Results. Seven oscillation events detected here exhibit a small but sustained displacement amplitude (0.04–0.10 Mm) for more than three cycles. Their periods range from 3 to 5 min. The phase speed is found to increase with loop length, which is consistent with the decrease in Alfvén speed with height. With these newly detected oscillations, we obtain a rough estimate of the magnetic field in the transition region, which is about 5–10 G.
Conclusions. Our results further reveal the ubiquity of decayless kink oscillations in the solar atmosphere. These oscillations in TR loops have the potential to be a diagnostic tool for the TR magnetic field.
An Atypical Presentation of Decubitis Angina in a Patient with Coronary Artery Disease and Aortic Regurgitation: Case Report
Authors: Yetkin Ertan , Atmaca Hasan , Yalta Kenan 
Published: December 2023

AbstractDecubitis angina briefly refers to a pain occurring during the night or in recumbent position. Herewith, we present a case of decubitis angina occurring immediately after lying down in a patient with coronary artery disease and aortic regurgitation. The patient was successfully treated by percutaneous coronary intervention. It should be kept in mind that early-onset chest pain immediately after lying down might be a sign of myocardial ischemia or acute coronary syndrome especially in the presence of coronary artery disease and aortic regurgitation.
Income illusions: challenging the high yield stock narrative
Authors: Chen Yin , Israelov Roni 
Published: December 2023

AbstractWhile stocks with high dividends have historically outperformed those with low dividends, we show that the difference can be completely explained by a set of well-known factors including value, quality and defensive. Applying a dividend filter to a portfolio of strategies having high exposure to these factors yields sub-optimal results. To test whether incorporating dividend yields can improve the performance of long-only factor portfolios, we construct a set of dividend-favored long-only factor portfolios with a heuristic rebalance algorithm and find that their after-tax net returns are lower than the dividend-agnostic counterparts. Collectively our results indicate that long-only active investors are better off loading directly on value, quality and defensive factors than purposely tilting their portfolios toward high-dividend stocks.
Development of the potential of the digital economy of Russian regions through artificial intelligence humanisation
Authors: Ekimova Ksenia V. 
Published: December 2023

AbstractThis paper is aimed at balancing the interests of business and society in the digital economy, to reduce the social risks of the Fourth Industrial Revolution. The goal of this paper is to study the experience and prospects of the humanisation of AI through the improvement of the practice of corporate social responsibility in Russia. By the example of the experience of Russian regions in 2021, we use econometric modelling to prove that the digital regional economy has a large potential in the sphere of humanisation of AI. The potential for the humanisation of AI in the digital economy of Russian regions is determined by responsible innovations, responsible production and logistics, as well as responsible marketing and sales, which contribute to the implementation of SDGs 9–12. The theoretical significance of the paper lies in its presenting smart region as a socio-economic environment for the humanisation of AI. The scientific novelty of the paper lies in its offering a new—meso-level—view of the humanisation of AI. The advantages of the new view include, first, consideration of socio-economic conditions for the humanisation of AI in a region; second, the most precise identification and correct measuring of the consequences of humanisation of AI for the quality of life in a region. The practical significance of the research results consists in the fact that the new proposed approach to the humanisation of AI, which implies public administration of this process at the level of a region, allows accelerating the considered process.
Thermal transport mechanism of 4H–SiC/SiO2 heterostructures: a molecular dynamics study
Authors: Xiao Chengdi , Xing Zhenguo , Shu Wenqiang , Zhang Haitao , Rao Xixin 
Published: December 2023

Abstract
Silicon carbide (SiC) is widely used in high-frequency, high-speed, and high-power applications such as power electronics, rail transportation, new energy vehicles, and aerospace. However, the thermal properties of the SiC/SiO2 interface, which is commonly found in SiC-based devices, are not yet fully understood. This study aims to investigate the influence of temperature and interface coupling strength on the interface thermal resistance (ITR) of 4H-SiC/SiO2 using non-equilibrium molecular dynamics simulations. Both crystalline and amorphous SiO2, as well as two interface contact modes (Si-terminated and C-terminated), have also been considered. The results reveal that the ITR of 4H-SiC/SiO2 is significantly affected by the interface coupling strength and contact modes. Under strong interface coupling conditions, the ITR for Si-terminated and C-terminated contacts modes of 4H-SiC/SiO2 interfaces are 8.077 × 10−10 m2KW−1 and 6.835 × 10−10 m2KW−1, respectively. However, under weak interface coupling conditions, these values increase to 10.142 × 10−10 m2KW−1 and 7.785 × 10−10 m2KW−1, respectively. Regardless of whether SiO2 is crystalline or amorphous, the ITR of the 4H-SiC/SiO2 interface exhibits a similar trend with increasing temperature (from 300 to 700 K). Additionally, the ITR of the amorphous SiO2 interface is smaller than that of the crystalline SiO2 interface under both strong and weak coupling conditions. To gain insights into the heat transport mechanism, the phonon density of states was analyzed to examine the phonon spectral characteristics under varying coupling strengths. These findings have implications for enhancing the thermal management and heat dissipation of SiC devices, providing a framework for controlling interface phonon scattering, and informing the thermal design of nanodevices.
A novel enhanced chaos based present lightweight cipher scheme
Authors: Abdelli Ali , El hadj Youssef Wajih , Kharroubi Fehmi , Khriji Lazhar , Machhout Mohsen 
Published: December 2023

Abstract
Lightweight ciphers have been developed to meet the rising need for secure communication in environments with limited resources. These ciphers provide robust encryption while ensuring efficient computation. Our paper introduces a new enhanced PRESENT lightweight cipher that utilizes chaotic systems to enhance its robustness and randomness while retaining the simplicity and compactness of the original cipher. By integrating chaotic maps into the cipher's core components, we improve its resistance against advanced cryptanalysis, such as differential, Salt & Peppers Noise (SPN), and loss data attacks. We also optimize the design for computational efficiency, making it suitable for deployment in devices with limited resources. Through extensive simulations and comparative analyses, we demonstrate the superiority of our enhanced cipher in terms of security and efficiency compared to other state-of-the-art lightweight ciphers. Our research contributes to the advancement of lightweight cryptography and provides a promising solution for secure communication in resource-constrained environments.
Numerical solution of the Whitham-Broer-Kaup shallow water equation by quartic B-spline collocation method
Authors: Sabawi Younis A , Hamad Hoshman Q 
Published: December 2023

Abstract
This paper introduces a novel quartic B-spline collocation method to address the coupled Whitham–Broer–Kaup (WBK) problem. The WBK problem is a topic of interest in the study of nonlinear wave phenomena and has applications in various fields, including fluid dynamics, plasma physics, and nonlinear optics. The method combines spatial quartic B-spline scheme discretization, and Crank–Nicolson temporal discretization. It is unconditionally stable as proven by the Von-Neumann technique. Numerical examples demonstrate the method’s superior accuracy compared to existing solutions. Error analysis employs

l

2

and

l

∞

norms, while the method exhibits high computational efficiency. The nonlinearity is managed through Rubin-Graves linearization. Comparisons with prior approaches highlight its efficiency, stability, adaptability to complex problems. The quartic B-spline method is well-suited for simulating fluid flow phenomena in shallow water scenarios, offering high accuracy and low computational cost.
Selective enhancement of difference sideband generation in a quadratically coupled optomechanical system with mechanical driving
Authors: Wang Xiao-Yun , Sun Xiao-Wei , Liu Zi-Jiang , Si Liu-Gang 
Published: December 2023

Abstract
We explore theoretically the generation and selective enhancement of difference sidebands in a quadratically coupled optomechanical system in which the membrane is driven resonantly by an additional coherent mechanical driving field. We show that the generation of frequency components at the difference sideband is directly related to the nonlinear optomechanical interactions under two-phonon resonance condition, while an additional weak coherent mechanical driving field acting on the membrane can considerably establish a selective enhancement of difference sideband generation (DSG). Our analytical solution with experimentally achievable parameters demonstrates that even if the input power of the control field is relatively low DSG can be induced and greatly enhanced when the matching conditions are satisfied. It also indicates that the efficiencies of upper difference sideband generation (UDSG) and lower difference sideband generation (LDSG) can be selectively increased about three orders by properly adjusting the frequency and amplitude of the weakly coherent mechanical driving field. Furthermore, we also show that the matching conditions of UDSG and LDSG are modified by the weakly coherent mechanical driving field. The present investigation may help to achieve the practical application of DSG relevant to nonlinear optics, chip-scale optical communications, and precision measurement.
The Jacobi last multiplier, Lagrangian and Hamiltonian for Levinson–Smith type equations
Authors: Mitra Shreya , Ghose-Choudhury A , Poddar Sujoy , Garai Sudip , Guha Partha 
Published: December 2023

Abstract
We derive the Jacobi last multiplier for second-order ordinary differential equations of the Levinson–Smith type by using a combination of previous techniques employed for the Liénard-I and II classes of equations. This opens up the possibility for a Lagrangian or Hamiltonian description of the systems governed by the Levinson–Smith type of equations as well as simplifying the problem of finding first integrals of motion. The procedure has been illustrated by a number of suitable examples alongwith Kamke's equation with explicit time dependent coefficients.
The quantum internet: an efficient stabilizer states distribution scheme
Authors: Koudia Seid 
Published: December 2023

Abstract
Quantum networks are a fundamental component of quantum technologies, playing a pivotal role in advancing distributed quantum computing and laying the groundwork for the future quantum internet. They offer a scalable modular architecture for quantum chips and support infrastructure for measurement-based quantum computing. Furthermore, quantum networks serve as the backbone of the quantum internet, ensuring high levels of security. Notably, the advantages of quantum networks in communication are contingent upon entanglement distribution, which faces challenges such as high latency in protocols relying on Bell pair distribution and bipartite entanglement swapping. Additionally, algorithms designed for multipartite entanglement routing encounter intractability issues, rendering them unsolvable within polynomial time. In this paper, we explore a novel approach to distribute graph states in quantum networks, leveraging local quantum coding (LQC) isometries and multipartite states transfer. We also present single-use bounds for stabilizer states distribution. Analogous to network coding, these bounds are attainable when appropriate isometries and stabilizer codes are selected for relay nodes, resulting in reduced latency in entanglement distribution. We further demonstrate the protocol’s advantages across various network performance metrics.
Energy calibration of silicon drift detector - based spectrometer at ADITYA-U
Authors: Purohit S , Taunk Y , Gupta M K , Garg K 
Published: December 2023

Abstract
The Tokamak plasma start-up is the first process to have a successful Tokamak plasma discharge. Considering the start-up condition, high electric field and neutral density with the absence of flux surfaces an enhanced electron transport to the Plasma-Facing Components (PFC) or the inner vessel wall is expected. Such electron excursion under an applied electric field induces electromagnetic emission, especially in the x-ray region. Such emission is important as it gives vital information about the initial condition of the plasma start-up and the potential for energy loss to the PFC/vessel walls. A Silicon Drift Detector (SDD) based soft x-ray (SX) spectrometer is installed at the ADITYA-U tokamak, operating within the range of 1–30 keV generating a 4 K channel spectrum. The energy calibration, spectra transformation from channel space to the energy space, is a pre-requisite for any spectroscopic measurement. The calibration is performed by natural radioactive sources 241Am, 109Cd, 133Ba, and 55Fe having micro-curie strength. Two-point and multipoint calibrations are applied to the SDD spectra. The results from the two processes establish that the multipoint calibration works well for the identification of the photon energy due to the realization of the detector linearity for a wider band.
Analysis of fusion cross-section and S-factor of 13C + 12,13C reactions for different density distributions at astrophysical energies
Authors: Aygun Murat , Kocak Gokhan 
Published: December 2023

Abstract
The effect of the various density distributions on 13C + 12,13C reactions is investigated by using the optical model at energies near and below Coulomb barrier. For this purpose, five different density distributions of the 12C and 13C nuclei are used to produce the real potential over the double folding model. To make a comprehensive analysis, the fusion cross-sections, S-factor and elastic cross-sections are simultaneously analyzed at astrophysical energies. It is seen that the theoretical results are in good agreement with the experimental data. In this study, the hindrance characteristics of the S-factors for the 13C + 12,13C reactions are also examined at low energies, and hindrance behavior is not observed.
Demonstration of 82% relaxed In0.18Ga0.82N on porous GaN pseudo-substrate by plasma-assisted molecular beam epitaxy
Authors: Khan Kamruzzaman , Wurm Christian , Collins Henry , Muthuraj Vineeta R. , Khan Md Irfan , Lee Cindy , Keller Stacia , Ahmadi Elaheh 
Published: December 2023

Abstract
In this study, the impact of InGaN film thickness and different compositionally graded structures on InGaN relaxation grown on tiled GaN-on-porous-GaN pseudo substrates (PSs) were studied. In addition, the impact of the degree of porosification on the In incorporation and relaxation of InGaN were examined. 82% relaxed 1μm thick In0.18Ga0.82N, which is equivalent to a fully relaxed In-composition of 15%, on porous GaN PS was obtained. Additionally, multi-quantum wells (MQWs) grown on the MBE InGaN-on-porous GaN base layers by MOCVD showed ∼85 nm redshift in comparison with MQWs grown on planar GaN. The developed InGaN-on-porous-GaN PSs can provide an alternative route to grow MQW with a high In content which is essential for high-efficiency nitride-based red LEDs.
Hemispherical power asymmetry in intensity and polarization for Planck PR4 data
Authors: Gimeno-Amo C. , Barreiro R.B. , Martínez-González E. , Marcos-Caballero A. 
Published: December 2023

Abstract
One of the foundations of the Standard Model of Cosmology is statistical isotropy, which can be tested, among other probes, through the study of the Cosmic Microwave Background (CMB). However, a hemispherical power asymmetry on large scales has been reported for WMAP and Planck data by different works.
The statistical significance is above 3σ for temperature, suggesting a directional dependence of the local power spectrum, and thus a feature beyond the ΛCDM model. With the third release of the Planck data (PR3), a new analysis was performed including the E-mode polarization maps, finding an asymmetry at a modest level of significance. In this work, we perform an asymmetry analysis in intensity and polarization maps for the latest Planck processing pipeline (PR4). We obtain similar results to those obtained with PR3, with a slightly lower significance (2.8% for the Sevem method)
for the amplitude of the E-mode local variance dipole as well as a significant variability with the considered mask.
In addition, a hint of a possible T-E alignment between the asymmetry axes is found at the level of ∼ 5%. For the analysis, we have implemented an alternative inpainting approach in order to get an accurate reconstruction of the E-modes. More sensitive all-sky CMB polarization data, such as those expected from the future LiteBIRD experiment, are needed to reach a more robust conclusion on the possible existence of deviations from statistical isotropy in the form of a hemispherical power asymmetry.
Axion-photon conversion in 3D media and astrophysical plasmas
Authors: McDonald J.I. , Garbrecht B. , Millington P. 
Published: December 2023

Abstract
With axions now a primary candidate for dark matter, understanding their indirect astrophysical signatures is of paramount importance. Key to this is the production of photons from axions in magnetised astrophysical plasmas. While simple formulae for axion-photon mixing in 1D have been sketched several decades ago, there has recently been renewed interest in robust calculations for this process in arbitrary 3D plasmas. These calculations are vital for understanding, amongst other things, the radio production from axion dark matter conversion in neutron stars, which may lead to indirect axion dark matter detection with current telescopes or future searches, e.g., by the SKA. In this paper, we derive the relevant transport equations in magnetised plasmas. These equations describe both the production and propagation of photons in an arbitrary 3D medium due to the resonant conversion of axions into photons. They also fully incorporate the refraction of photons, and we find no evidence for a conjectured phenomenon of dephasing. Our result is free of divergences which plagued previous calculations, and our kinetic theory description provides a direct link between ray tracing and the production mechanism. These results mark an important step toward solving one of the major open questions concerning indirect searches of axions in recent years, namely how to compute the photon production rate from axions in arbitrary 3D plasmas.
Entropic property of randomized QAOA circuits
Authors: Chernyavskiy A Yu , Bantysh B I , Bogdanov Yu I 
Published: December 2023

Abstract
Quantum approximate optimization algorithm (QAOA) aims to solve discrete optimization problems by sampling bitstrings using a parameterized quantum circuit. The circuit parameters (angles) are optimized in the way that minimizes the cost Hamiltonian expectation value. Recently, general statistical properties of QAOA output probability distributions have begun to be studied. In contrast to the conventional approach, we analyse QAOA circuits with random angles. We provide analytical equations for probabilities and the numerical evidence that for unweighted Max-Cut problems on connected graphs such sampling always gives higher entropy of energy distribution than uniform random sampling of bitstrings. We also analyse the probability to obtain the global optima, which appears to be higher on average than for random sampling.