bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wave transformations near a coronal magnetic null point
Authors: Yadav N. , Keppens Rony 
Published: November 2023

Context. Null points are often invoked in studies of quasi-periodic coronal jets and in connection with periodic signals preceding actual reconnection events. Although the periodicity of these events spans a wide range of periods, most show a 2- to 5-min periodicity compatible with the global p-modes.
Aims We investigate whether magnetohydrodynamics (MHD) waves, in particular, acoustic p-modes, can cause strong current accumulation at the null points. This can in turn drive localized periodic heating in the solar corona.
Methods. To do this, we began with a three-dimensional numerical setup incorporating a gravitationally stratified solar atmosphere and an axially symmetric magnetic field including a coronal magnetic null point. To excite waves, we employed wave drivers mimicking global p-modes. Using our recently developed wave-mode decomposition technique, we investigated the process of mode conversion, mode transmission, and wave reflection at various important layers of the solar atmosphere, such as the Alfvén acoustic equipartition layer and transition region. We examined the energy flux distribution in various MHD modes or in acoustic and magnetic components, as the waves propagate and interact with a magnetic field of null topology. We also examined current accumulation in the surroundings of the null point.
Results. We found that most of the vertical velocity is transmitted through the Alfvén acoustic equipartition layer and maintains an acoustic nature, while a small fraction generates fast waves via the mode conversion process. The fast waves undergo almost total reflection in the transition region due to sharp gradients in density and Alfvén speed. There are only weak signatures of Alfvén wave generation near the transition region through the fast-to-Alfvén mode conversion. Because the slow waves propagate with the local sound speed, they are not much affected by the density gradients in the transition region and undergo secondary mode conversion and transmission at the Alfvén-acoustic equipartition layer surrounding the null point. This leads to fast-wave focusing at the null point. These fast waves have associated perturbations in current density and show oscillatory signatures that are compatible with the second harmonic of the driving frequency. This might result in resistive heating and in an enhanced intensity in the presence of finite resistivity.
Conclusions. We conclude that MHD waves are a potential source for oscillatory current dissipation around the magnetic null point. We conjecture that in addition to oscillatory magnetic reconnection, global p-modes could lead to the formation of various quasi-periodic energetic events.
Association Between Metabolic Syndrome and the Risk of Lung Cancer: A
Meta-Analysis
Authors: Zhang Zhao , Liu Qinxiang , Huang Congcong , Wu Jun , Wen Yingsheng 
Published: November 2023

AbstractPrevious studies showed conflicting results regarding the association between
metabolic syndrome (MetS) and risk of lung cancer. We performed a systemic
review and meta-analysis to determine the relationship between MetS and lung
cancer incidence and mortality in adults. Longitudinal follow-up studies were
identified by search of Medline, Embase, Cochrane Library, and Web of Science.
By incorporating potential heterogeneity into the model, a randomized-effects
model was selected to pool the results. Fourteen observational studies were
included. Pooled results showed that MetS was associated with a higher risk of
lung cancer incidence [risk ratio (RR): 1.15, 95% confidence interval
(CI): 1.05 to 1.26, p=0.002; I2=89%).
Subgroup analysis suggested that the association was not significantly affected
by study country, design, sex of the participants, adjustment of smoking, or
different study quality scores (p for subgroup difference all>0.05). The
association was predominantly contributed by studies with MetS defined by the
National Cholesterol Education Program Adult Treatment Panel-III rather than
those with MetS defined by the International Diabetes Foundation criteria, and
the association seemed to be stronger in studies with follow-up within 6 years
than those over 6 years (p for subgroup difference=0.03 and 0.04,
respectively). In addition, pooled results also showed that MetS was associated
with a higher risk of lung cancer mortality (RR: 1.46, 95% CI: 1.19 to
1.79, p <0.001; I2=0%). In conclusion, in
adult population, MetS may be a risk factor of lung cancer incidence and
mortality.
Convenient Synthesis of Functionalized Tetracyclic Dihydrochromeno[2,3-b]pyrrolo[3,4-e]pyridine-triones via Four-Component Reactions
Authors: Alizadeh Abdolali , Rostampoor Azar 
Published: November 2023

AbstractIn this research, a simple and efficient strategy for the straightforward synthesis of tetracyclic dihydrochromeno[2,3-b]pyrrolo[3,4-e]pyridine-trione derivatives is presented by a sequential four-component reaction of arylamines, dimethyl acetylenedicarboxylate, alkylamines, and 3-formylchromones as readily available starting materials in MeOH at room temperature. The merit of this sequential enamine formation/1,2-nucleophilic addition/intramolecular aza-Michael addition is highlighted by its high energy conserving (short reaction times at room temperature), excellent yields, metal-free catalyst, easy purification (the products can be purified by simple filtration and washing with EtOH), and green and mild conditions in a one-pot reaction. Presumably, there are no previous reports for the synthesis of these classes of heterocyclic dihydrochromeno[2,3-b]pyrrolo[3,4-e]pyridine-trione derivatives.
Modelling the significance of strategic orientation on green innovation: mediation of green dynamic capabilities
Authors: Xiao Han , Al Mamun Abdullah , Masukujjaman Mohammad , Yang Qing 
Published: November 2023

AbstractThe increasing recognition of environmental concerns has prompted both nations and corporations to adopt green innovation as a significant strategy for addressing environmental risks and promoting sustainable development. To excel in this pursuit, companies must cultivate green dynamic capabilities, infusing environmental considerations into their strategic decision-making processes. The purpose of this study is to investigate the association between strategic orientation components and green dynamic capabilities, as well as their impact on green product and process innovation, in medium-to-large-sized manufacturing firms in China. Employing a quantitative methodology, an online cross-sectional research design was used to gather 582 valid responses through a structured questionnaire. Results indicated a positive association between learning orientation and green dynamic capabilities. Furthermore, green dynamic capability was found to mediate the relationship between learning orientation and green product and process innovation. However, no significant relationship was observed between green entrepreneurial orientation, market orientation, internationalisation orientation, and green dynamic capabilities. By conducting multi-group analysis and studying the context of Chinese manufacturing firms, this research contributes new insights into the relationship between resource-based theory constructs and green innovation, including the integration of green dynamic capabilities. The results emphasise the significance of adopting a learning mindset, developing green dynamic capabilities, and fostering green innovation. These findings offer useful insights for the Chinese manufacturing industry, enabling it to strengthen its competencies in green innovation.
Experimental realization of Weaire–Phelan foams as photonic crystals
Authors: Uribe A. Aguilar , Yazhgur P. , Scheffold F. 
Published: November 2023

We experimentally investigate the properties of crystalline 3D Weaire–Phelan foam structures as photonic crystals. We generate templates on the computer and use direct laser writing (DLW) lithography to fabricate foam designs in a polymer material. Due to the complicated structure of the foams, conventional DLW does not offer the resolution to produce systems with a stop band for telecommunication wavelengths. We employ shrinkage by thermal processing to circumvent this problem and show experimentally that foam Plateau border networks built in this way provide a stop-band within the wavelength interval of λ = 1–2 μm, with the specific wavelength dependent on the degree of shrinkage. We also investigate the dependence of the position and strength of the stop-gap on the solid filling fraction.
Evaluating the Pretoria Agreement: the limitations of presentist analysis of conflicts in Ethiopia
Authors: Abbink Jon 
Published: November 2023

SUMMARY
This debate piece contains an assessment of the debate on the ‘Pretoria Agreement’ (or Cessation of Hostilities Agreement) concluded on 2 November 2022 regarding the armed conflict in Ethiopia. On the basis of a critical discussion of a paper by F. Gebresenbet and Y. Tariku (2023) published in the Spring issue of the Review of African Political Economy (ROAPE), the author here contests the short-term analysis of the authors, who miss essential points of the wider context of political conflict in Ethiopia and also scholastically misrepresent some other authors in the debate.
Study on deformation theory and resonance frequency of circular-plane PVC actuator
Authors: Du Zhuoao , Luo Bin , Zhu Kejun 
Published: November 2023

Abstract
The polyvinyl chloride (PVC) gel actuator has the advantages of low mass density, large actuation strain, good compliance, and simple fabrication. It deforms when excited by a voltage, and the deformation amplitude of the actuator is higher when an alternating current voltage of a specific frequency causes the actuator to resonate. In this paper, a circular-plane actuator based on PVC gel film and flexible electrodes was developed. Then, a theoretical model is established based on the Yeoh strain energy density function model and the mechanical analysis of deformation region-boundary constraints, the key parameters affecting the deformation are obtained. Subsequently, finite element simulation tests were done on the basis of this model, and the values of uniaxial stretching were highly consistent with the previous actual experimental results, which verified the reasonableness of the model and simulation method. Then, we focus on the analysis of the resonance frequencies of PVC actuators with different plasticizer content, electrode diameter, and pre-stretching degree. Finally, we compare the differences in time-domain characteristics of PVC actuators in the resonant and non-resonant states.
Optimal spatially-dependent diffusion tensors
Authors: Oakley Bryan W , Bonner Gage , Thiffeault Jean-Luc 
Published: November 2023

Abstract
We consider the spatially-dependent diffusion tensors that maximize the rate of convergence to equilibrium of solutions to the heat equation in inhomogeneous media. We formulate a variational problem for the optimal spectral gap, subject to an Lp
constraint on the diffusion tensors, and solve a relaxed version of this variational problem. This provides an upper bound for the optimal spectral gap. The solution is characterized in terms of the extremals of Sobolev and Poincaré type inequalities. To illustrate this result, we give a presentation of the one-dimensional case. In this case, we can adapt the known closed solution of a related eigenvalue problem to write the solution to the relaxed variational problem, arriving at an expression for the upper bound on the optimal spectral gap. The sharpness of this upper bound is then investigated by comparison to numerical simulations.
Non-analytic behaviour in large-deviations of the susceptible-infected-recovered model under the influence of lockdowns
Authors: Mulholland Leo Patrick , Feld Yannick , Hartmann Alexander K 
Published: November 2023

Abstract
We numerically investigate the dynamics of an SIR model with infection level-based lockdowns on Small-World networks. Using a large-deviation approach, namely the Wang–Landau algorithm, we study the distribution of the cumulative fraction of infected individuals. We are able to resolve the density of states for values as low as 10−85. Hence, we measure the distribution on its full support giving a complete characterization of this quantity. The lockdowns are implemented by severing a certain fraction of the edges in the Small-World network, and are initiated and released at different levels of infection, which are varied within this study. We observe points of non-analytical behaviour for the pdf and discontinuous transitions for correlations with other quantities such as the maximum fraction of infected and the duration of outbreaks. Further, empirical rate functions were calculated for different system sizes, for which a convergence is clearly visible indicating that the large-deviation principle is valid for the system with lockdowns.
Modeling the electrical properties of heterojunctions using ANFIS, ANFIS-GA and ANFIS-PSO Models
Authors: Mohamed R A 
Published: November 2023

Abstract
The present research introduces a theoretical study that aims to utilize ANFIS in estimating and predicting the electrical behavior of heterojunctions. For this purpose, five different heterojunctions were chosen. The experimental datasets that represent the electrical behavior of the chosen heterojunctions were extracted and employed in ANFIS as targets. To enhance the ANFIS performance two hybrid heuristic algorithms, genetic algorithm (GAs) and particle swarm optimization (PSO) were combined with ANFIS. The major contribution of the current research is to predict the electric characteristics of heterojunctions using ANFIS and increase the modeling accuracy of ANFIS by optimizing the premise and consequent parameters using (GAs) and (PSO). Also, compare the proportion of enhancement produced by using ANFIS-GA and ANFIS-PSO to decide which of them is more powerful under the study conditions. However, to the author’s knowledge, the presented goals have not been investigated before for heterojunctions. The mean squared error (MSE), the correlation coefficient (R2), and the standard deviation error (Std. error) were calculated for all trained models. The modeling errors of ANFIS-GA and ANFIS-PSO were compared to the error values produced by ANFIS. According to modeling results, simulation ANFIS outputs follow the experimental data patterns in excellent response. Predictions of electrical characteristics for heterojunctions using the trained models provide acceptable results where the MSE values obtained by training ANFIS-PSO are lower than their values obtained by ANFIS and ANFIS-GA models. The improvements in average percentages in ANFIS performance when combined with GA and PSO are equal to 2.2% and 3%, respectively. Consequently, the proposed ANFIS-PSO model is more accurate in predicting the electrical behavior of heterojunctions under the study conditions.
Mass production of carbon nanotube fibers and hybrid yarns for high-performance helical auxetic yarn strain sensors
Authors: Yu Long , Liu Han , Liu Xinyu , Yang Ming , Xie Jinlin , Qiu Hua , Chen Kunlin , Wei Guoke , Gu Peng 
Published: November 2023

Abstract
With the spectacular physical properties of electrical conductivity, mechanical strength and thermal conductivity, carbon nanotube (CNT) fibers are favored in many fields such as energy storage devices, sensing, electromagnetic shielding and structural reinforcement, especially in flexible sensing devices. However, the lower tensile properties of CNT fibers limit their further application in stretchable strain sensors, especially when monitoring large deformation variables. Here, large-scale continuous production of CNT fibers has achieved through floating catalytic chemical vapor deposition (FCCVD) technology. In the meantime, the CNT fibers were hybrid with Kevlar fibers to obtain hybrid CNT yarns with the strength of 168.4 MPa and the electrical conductivity of 7.78 × 104 S m−1. The strength of the hybrid CNT yarns produced by this method is higher than that of 40 count cotton yarns, which is perfectly suited for the fabrication of textile devices. Through knitting with three-dimensional elastic fabrics, the textile-based sensors exhibit promising sensing ability, washability, weather tolerance and sweat resistance, owing to the excellent physical and chemical properties of the hybrid CNT yarns. Moreover, stretchable strain sensors exhibit fast response and cycle stability, which provides unique opportunities in designing smart textiles with fast response and environmental durability.
A new mechanism for internal kink stabilization by plasma flow and anisotropic thermal transport
Authors: Bai Xue , Liu Yueqiang , Hao Guangzhou , Dong Guanqi , Zhang Neng , Wang Shuo 
Published: November 2023

Abstract
Stability of the internal kink (IK) mode is numerically investigated with inclusion of the anisotropic thermal transport effect and the toroidal plasma flow. It is found that anisotropic thermal transport, in combination with plasma flow, stabilizes the IK in two ways. One is direct stabilization of the mode synergistically with plasma flow. The other, indirect stabilization involves generation of a finite mode frequency in static plasmas by thermal transport, which in turn invokes wave-wave resonance damping of the mode via interaction with stable shear Alfvén waves. This second IK stabilization mechanism is further corroborated by examining the eigenmode structure, which peaks at the radial locations where the mode frequency matches that of the shear Alfvén wave. Finally, two branches of unstable IK are identified, with mode conversion occurring at certain plasma flow speed and thermal transport level. These findings provide new physics insights in the IK stability in tokamak fusion plasmas.
High Power Electromagnetic Pulse Damage Effect of a Low Noise Amplifier
Authors: Xu Yi , Meng Cangzhen , Xiang Jiantao , Hu Xin 
Published: November 2023

Abstract
Low noise amplifier (LNA) is the most sensitive component in the front end of a wireless communication system, which is very vulnerable to coupling attack of high-power electromagnetic pulse (HPEMP). This paper first analyzes the damage mechanism of a high-power electromagnetic pulse to a low noise amplifier, then designs the damage experiment of high-power electromagnetic pulse injection to the low noise amplifier, and verifies the damage mechanism and damage threshold of a certain radar low noise amplifier. The experimental results show that the LNA is not affected by the linear effect of high-power electromagnetic pulse. When the high-power electromagnetic pulse exceeds the damage threshold, thermal melting occurs between the FET grid sources in the device, causing permanent damage to the LNA and performance failure. This conclusion can provide data support for the high-power electromagnetic pulse protection design of this type of LNA.
The Relationship between Complete Vehicle and Components in Narrowband Radiation Emission Limits in the Standard of ECE R10
Authors: Zhou Lusha , Zeng Aijing , Ding Yifu , Liu Guangfu , Liu Zhe , She Haijun 
Published: November 2023

Abstract
The narrowband radiated emission limit curve of the vehicle has changed significantly in the sixth revision of ECER 10. In this article, the emission value of electromagnetic waves at different distances in different frequency bands is measured. Meanwhile, the correspondence between the narrowband radiation emission limits of the whole vehicle and the components is explored. Finally, the correspondence between the far field and near field applicable to narrowband radiation emission of components in automotive inspection engineering is proposed.
Spectral response of sulfonated polystyrene photonic crystals with varying concentrations of ethanol
Authors: S S Sree Sanker , Thomas Subin , Jacob Dhanya P , Nalini Savitha , Madhusoodanan K N 
Published: November 2023

Abstract
Modifying polystyrene (PS) spheres through sulfonation is a well-established method to enhance their hydrophilic properties, rendering them valuable in diverse applications. Fabrication of photonic crystals (PCs) with sulfonated polystyrene (SPS) spheres offers an important platform for sensing applications. The hydrophilic nature of such PC platform helps in improving the detection of water content. In the present work, monodispersed SPS spheres were synthesized by adjusting the duration of the sulfonation reaction on the PS spheres created via emulsifier-free emulsion polymerization. PC opal films were fabricated using self-assembled PS and SPS spheres. The opal films were characterized using various techniques, including Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), angle-resolved reflection spectroscopy (ARRS), zeta potential and dynamic light scattering, and the results were compared and analysed. The hydrophilicity of the opal films was investigated using the water contact angle measurement, and it was found to improved by sulfonation. The spectral response of the PC opal films was investigated by monitoring Bragg’s diffraction spectra from the films using UV–VIS spectrometer. As a demonstration of a specific application, the prepared PC opal films were used to measure the water content in ethanol. PS and SPS opal films exhibited a noticeable blue shift in their spectral response when the water content in ethanol was increased to 3.8% and 3.4%, respectively. The added hydrophilicity brought on by the attached sulfonic groups improved the SPS film’s sensitivity to the water in the ethanol. SPS spheres demonstrated an optical response over a significantly more extensive range of the water content in ethanol than PS, which has a limited response range of up to 50%. Sulfonating PS spheres enhances colloidal stability and minimizes the tendency for aggregation in solution. Sulfonation for more than 3 h is found to exhibit reduced mechanical strength. Though the sulfonation induces an increase in surface roughness, the quality of the ordered arrangement of the spheres remained the same in comparison with PS films. By taking advantage of SPS’s hydrophilicity, high reactivity, stability, and the possibility of attaching additional functional groups, the present study opens up new possibilities for sensing water content in ethanol.
A quasi three–dimensional model for PEM fuel cell impedance: The effect of local oxygen depletion under the flow field rib
Authors: Reshetenko Tatyana , Kulikovsky Andrei 
Published: November 2023

Abstract
Our previous 1d+1d model for PEM fuel cell impedance is extended to take into account 2d distribution of the oxygen concentration in the gas–diffusion layer under the flow field channel and rib. Fitting of the model impedance to the experimental spectra from the segmented PEMFC shows that in spite of nearly uniform GDL oxygen diffusivity, local oxygen concentration and current density exhibit strong decay under the rib (land). The effect is merely due to larger oxygen transport distance under the rib. The results demonstrate validity of local EIS for measuring 3D distribution of local current in an operating PEM fuel cell.