bluuebunny/crossref_metadata_2025 huggingface dataset:
How we argue about the use of images
Authors: Heshmati Bita , Modrzejewska Ewa
Published: September 2024

This paper is about argumentative exchanges in which two or more parties disagree about the appropriateness of the use of images (e.g., press photographs, drawings, pictures, and other visual elements) in argumentative contexts. We label such argumentative exchanges as metavisual disputes. In the first part of the paper, we develop this notion by employing theories in the philosophy of language, specifically Plunkett’s notion of metalinguistic disputes (2015) and Mankowitz’s propositional account (2021). In the second part of the paper, we illustrate the phenomena of metavisual disputes by analyzing two tweets relating to the migrant situation at the Polish-Belarusian border in 2021–2022. We argue that the viewers’ perspective characterizes a metavisual dispute in which they evaluate the use of images in the tweets by raising particular criticism against it.
Optical diagnostics of vacuum arcs in the process of DC interruption
Authors: Tang Q , Maede Y , Sato M , Kumada A , Jia S
Published: September 2024

Vacuum circuit-breakers (VCBs) are commonly used in emerging mechanical DC circuit-breakers. The electrical performance of VCBs in DC interruption duties has been extensively investigated, but basic physics such as the excitation temperature of plasma species, electron/vapor densities and emission of droplets in such applications were rarely reported. In this paper, we focus on how the short high frequency (HF) current pulse affects erosion of electrodes as well as generation of flying droplets by using laser shadow photography. Spectroscopy was adopted to obtain spectra and calculate the excitation temperature of CuI. Shack–Hartmann wavefront sensors were applied to measure neutral and electron density, in tests where di/dt, breaking current and the direction of the injected HF current varied. Indeed, the in-phase injection of the HF current caused an intense arc, but the pulse was too short to make either the cathode or anode melt. Since the plasma is in a nonequilibrium state, the excitation temperature of CuI is relatively low. Electron densities in different tests all approach similar values right before current zero. Neutral densities show strong fluctuation and independence on instantaneous current.
Plastic deformation mechanism of γ phase Fe–Cr alloy revealed by molecular dynamics simulations
Authors: Peng Peng , Lai Wensheng
Published: September 2024

Due to their outstanding mechanical properties, anti-corrosion properties, and anti-irradiation swelling properties, Fe–Cr alloys have been fully improved and developed for nuclear energy applications as structural materials. To ensure the performance stability of γ-phase Fe–Cr alloys, the present study adopted molecular dynamics (MD) simulations to explore the plastic deformation mechanism of these alloys. The slip model was constructed, and the generalised stacking fault energy (GSFE) and Peierls–Nabarro (P–N) equations were solved, revealing that {110}<111> is the preferentially activated slip system. The twinning model was constructed and the generalised plane fault energy was solved, demonstrating that twinning is preferred over slipping in the {112}<111> system. The above findings are also verified through MD simulations in which Fe–Cr specimens are stretched along the [100] direction. In addition, in the 15 at.%–25 at.% Cr range, an increase in the Cr content has a negative effect on slip but a positive effect on twin formation.
A frequency steerable electromagnetic acoustic transducer
Authors: Martinho Lucas M , De Marchi Luca , Kubrusly Alan C
Published: September 2024

Electromagnetic acoustic transducers (EMATs) are convenient for non-destructive evaluation of plate-like structures since they can generate, without the need for contact with the medium under test, different types of ultrasonic guided waves. Guided-wave EMATs usually generate waves omnidirectionally or in a principal propagation direction. Beam steering is desirable in several applications, such as in inspections of large-area structures. This is usually achieved with several independently controlled elements forming a phased array. Alternatively, mono-element transducers with directional-dependent spectral content can steer the generated wave beam by altering the frequency of the excitation signal. A piezoelectric transducer with this characteristic, namely a frequency steerable acoustic transducer, was previously proposed. Its design was addressed in the wavenumber domain, leading to unconventional transducer shapes, but still reproducible with a piezoelectric patch, albeit unfeasible to implement as an EMAT. Here, we propose a new kind of EMAT, namely, frequency steerable EMAT (FSEMAT), whose design is addressed in the spatial domain in order to ensure its physical realization with a coil-magnet arrangement whilst still effectively presenting steering capability. The novel EMAT was designed to generate the A
0 Lamb wave mode in a frequency range from approximately 100 to 600 kHz. The FSEMAT was fabricated and experimentally evaluated in an aluminium plate at different frequencies within the designed frequency range, where each frequency corresponded to a specific propagating direction with high directivity, assessed by half-power beam widths of approximately 10 degrees. Furthermore, its theoretical directivity was computed by means of a wavenumber spectrum-based model, and showed good agreement with experimental results. The new transducer allows great flexibility effectively providing beam steering with a single EMAT.
Comment on ‘Reversible superconducting-normal phase transition in a magnetic field: the energy-momentum balance including the velocity field of the Berry connection from many-body wave functions’ (2024, Physica Scripta, 99, 015952)
Authors: Nikulov A V
Published: September 2024

According to the article by Hiroyasu Koizumi (2024 Physica Scripta 99 015952) not only Joule heat, but also latent heat should be absent during the superconducting-normal transition in the presence of the magnetic field H = H

c
(T). The publication of the false theory became possible because the author of this theory does not know that the transition at H = H

c
(T) is considered as the first-order phase transition after 1933. The theory, alternative to the conventional BCS theory of superconductivity, was provoked by Hirsch’s publications and the author’s false understanding of the results of calorimetric experiments. The alternative theory contradicts to the law of energy conservation since its author does not know about the work performed during the transition at H = H

c
(T).
Exploring the physical properties of Mn2VSi and Mn2VGe Heusler alloys under high pressure conditions: a theoretical investigation using GGA and TB-mBJ calculation
Authors: Kanwal Shamsa , Jamil M Imran , Tariq Saad , Ahmed Afaq , Adawi Hind , Al Bahir Areej , Ullah Saeed , Munir H Bushra , Ghani Muhammad Usman
Published: September 2024

The investigation into Mn2VSi and Mn2VGe Heusler alloys has yielded crucial insights into their structural, mechanical, thermal, electronic, and magnetic attributes. Employing Density Functional Theory (DFT) with Generalized Gradient Approximation (GGA) and Tran Blaha modified Becke Johnson (TB-mBJ) method, these alloys were comprehensively analyzed. Structurally, both compounds exhibited stability in the regular Heusler structure, with precise lattice constants and pressure-volume variations. Elastic properties indicated mechanical stability and ductile behavior, with enhanced material strength under elevated pressure. Thermodynamic assessments revealed behavior under extreme conditions, while electronic properties showed half-metallic behavior and semiconducting characteristics. Magnetic moments decreased with pressure, signaling a magnetic transition state in alloys. This theoretical study provides valuable insights into Mn2VSi and Mn2VGe compounds, offering potential applications in spintronics and magnetic sensors.
Plasmonic effect of gold nanoparticles on rear side of flexible black silicon wafer fabricated by aluminum-assisted chemical etching
Authors: Omar Halo Dalshad , Uddin Shahnawaz , Braim Farhank Saber , Hashim Md Roslan , Pakhuruddin Mohd Zamir
Published: September 2024

In this work, we investigate the effects of the different sizes of gold (Au) plasmonic nanoparticles (NPs) on the rear surface of flexible black silicon (b-Si) wafer. The flexible b-Si (65 μm thickness) is fabricated by aluminum-assisted chemical etching (AACE) process, utilizing aluminum (Al) as the catalyst. After the b-Si fabrication, nanopores are produced on the flexible wafer surface. Then, gold nanoparticles (Au NPs) are spin-coated on the rear side of the flexible b-Si, followed by surface morphological and optical characterizations. The Au NPs with sizes of 24–92 nm have been deposited on the rear surface of the b-Si wafer. Based on the optical characterization, light absorbance increases above wavelength 800 nm due to enhanced light scattering by the Au NPs at the back surface. The average reflectance (Rave) is calculated in the 300 nm–1100 nm wavelength range for flexible crystalline silicon (c-Si) reference and compared with flexible b-Si surface and flexible b-Si/Au NPs. The lowest Rave of 15.4% is achieved for Au NPs with average size of 92 nm.
A novel numerical method to solve fractional ordinary differential equations with proportional Caputo derivatives
Authors: Mahatekar Yogita M , Kumar Pushpendra
Published: September 2024

In this paper, we develop a novel numerical scheme, namely ‘NPCM-PCDE,’ to integrate fractional ordinary differential equations with proportional Caputo derivatives of the type
pc

D

α

u(t) = f
1(t, u(t)), t ≥ 0, 0 < α < 1 involving a non-linear operator f
1. A new method is developed using a natural discretization of the proportional Caputo derivative and the decomposition method to decompose the non-linear operator f
1. The error and stability analyses for the proposed method are provided. Some illustrated examples are given to compare the solution curves graphically with the exact solution and to prove the utility and efficiency of the method. The proposed NPCM-PCDE is found to be efficient, easy to implement, convergent, and stable.
Understanding the relationship between electric dipole polarizability and photonuclear (-2) moment in odd-A actinide nuclei
Authors: Kemah E , Yakut H , Tabar E , Hoşgör G
Published: September 2024

The nuclear electric dipole (E1) polarizability (α

E1) is mainly dominated by the dynamics of the giant dipole resonance (GDR). α

E1 is proportional to the (-2) moment of the total photo nuclear cross-section (σ
−2). This research investigates the relationship between α

E1 and σ
−2, along with the effects of the Pygmy Dipole Resonance (PDR) and GDR in odd-mass actinide nuclei. For the first time, α

E1 and σ
−2 values have been calculated using the Translational and Galilean Invariant Quasiparticle Phonon Nuclear Model (TGI-QPNM) approach for odd-A actinide nuclei. According to TGI-QPNM results, E1 dipole transitions in the GDR region significantly contribute to σ
−2 due to the energy weighting factor. Below the neutron separation threshold, the PDR in neutron-rich nuclei shows a contribution of about 5% to σ
−2 values. In this region, E1 polarizability can reach values of 20%–25%. The α

E1 values indicate the presence of PDR in these nuclei. Additionally, the Adaptive Neuro-Fuzzy Inference System (ANFIS), a new machine learning method, has been performed to analyze the relationship between α

E1 and σ
−2. The ANFIS results have been compared with those from the TGI-QPNM and experimental data. The TGI-QPNM model achieves an R2 of 0.85–0.95, while the ANFIS model achieves an R2 of 0.99. Moreover, the study suggests that the ANFIS model, consistent with TGI-QPNM results, could be an effective tool for estimating σ
−2 in odd-A actinide nuclei.
A front-fixing numerical method for a fluvio-deltaic sedimentation process with thespace fractional derivative and variable sediment flux
Authors: Joshi Jaya , Rajeev  , Gómez-Aguilar J F , Lavín-Delgado J E
Published: September 2024

This paper centers around a space-fractional mathematical model for a fluvio-deltaic sedimentation process which involves a space-fractional derivative (Caputo derivative) and time dependent variable sediment flux to investigates the movement of shoreline in a sedimentary ocean basin. This model is a specific case of a basic shoreline model and analogous to a Stefan problem. The numerical solution to the problem is acquired by employing a front-fixing explicit finite difference method. The consistency, stability and convergence of the numerical scheme are theoretically analyzed. The effects of variable sediment flux on the movement of shoreline position and the height of sediments are also assessed for different cases.
Quantum transport of topological surface states in presence of circular n-p junctions
Authors: Agrawal Neetu
Published: September 2024

The surface states of topological insulators are characterized by spin-momentum locking, where the electron spin is locked perpendicular to its momentum. This property is preserved under gate potentials which can be used to manipulate spin currents without an external magnetic field enhancing the prospects for spintronic applications. Here, we investigate the scattering of the wave functions of topological surface states within the circular n-p junction positioned on the upper surface of the quintuple-layered three-dimensional topological insulator. With the analytical calculations we explain the scattering of these surface states in such systems.
Correcting the effect of temperature changes in the measurement results of dielectric response in power transformers as an arrhenius type dielectric with the help of artificial neural network
Authors: Mousavi Seyed Amidedin , Bigdeli Mehdi , Arfaei Masoud , Mohamadi Hossein
Published: September 2024

Polarization and Depolarization Current (PDC) and Frequency Domain Spectroscopy (FDS) measurements are common dielectric response tests in time and frequency domain that are widely used to diagnosis insulation status in power transformer companies. Numerous factors affect the PDC and FDS test results, which the most important of them is temperature variation. To accurately interpret the results of the dielectric response, the effect of temperature on the results in time and frequency domains, must be corrected. In this paper, firstly a 200 MVA transformer is selected as a test object and FDS and PDC tests are performed on it at different temperatures. Then, based on the FDS results performed on a transformer at different temperatures, the parameters of the insulation model have been estimated by using genetic algorithm (GA). Next, with the help of artificial neural network (ANN), the parameters of the insulation model, related to the different temperatures are transferred into the reference parameters. After that, the parameters of the transferred insulation model, the FDS curves are plotted and transferred to the reference temperature curve and the effect of temperature on them is compensated. By using the correlation of the time and frequency domain results, with the help of transferred insulation model parameters, the PDC results are also plotted and transmitted on the reference PDC curve. Finally, with such a method, the effect of temperature on the PDC results is compensated.
Gravitational wave signatures of cogenesis from a burdened PBH
Authors: Barman Basabendu , Haque Md Riajul , Zapata Óscar
Published: September 2024

We explore the possibility of explaining the observed dark matter (DM) relic abundance, along with matter-antimatter asymmetry, entirely from the evaporation of primordial black holes (PBH) beyond the semi-classical approximation. We find that, depending on the timing of modification to the semi-classical approximation and the efficiency of the backreaction, it is possible to produce the correct DM abundance for PBHs with masses ≳𝒪(103) g, whereas producing the right amount of baryon asymmetry requires light PBHs with masses ≲𝒪(103) g, satisfying bounds on the PBH mass from the Cosmic Microwave Background and Big Bang Nucleosynthesis. However, in a simplistic scenario, achieving bothsimultaneouslyis not feasible, typically because of the stringent Lyman-αconstraint on warm dark matter mass. In addition to DM and baryon asymmetry, we also investigate the impact of memory burden on dark radiation, evaporated from PBH, constrained by the effective number of relativistic degrees of freedom ΔNeff. Furthermore, we demonstrate how induced gravitational waves from PBH density fluctuations can provide a window to test the memory-burden effects, thereby placing constraints on either the DM mass scale or the scale of leptogenesis.
Assessment of the status of PM2.5 and ground-level O3 pollution variations and meteorological factor effects: A case study in Long An Province, Vietnam
Authors: Hoang Nguyen Phong , Chau My Nguyen Duyen , Ta Bui Long
Published: September 2024

Long An Province has a favorable geographical position in socio-economic development exchanges and is a fundamental bridge between the area of Ho Chi Minh City (HCMC) and the Southeast localities with the Southwestern provinces. Along with the master plan for socio-economic development with a vision for 2030, the province’s air quality issues, especially PM2.5 and surface O3 pollution, will be complex and pose many challenges to effective air pollution management and control. This study aims to investigate the effects of major meteorological characteristics (temperature–T, relative humidity–RH, surface pressure–P, and wind speed–WS) on temporal changes in the correlation between PM2.5 and surface O3 concentrations in Long An province in the 2018-2020 period (computed by a system of coupled WRF/CMAQ models) through trend evaluation using by Mann-Kendall (MK) Test and Theil-Sen Slope, and Pearson correlation analysis. The study results reported that in terms of temporal variations, both value levels of PM2.5 and O3 in the dry season tended to surpass that in the rainy season. Moreover, PM2.5 levels tended to exceed the 24-hour mean threshold (between 1.001 and 3.14 times) and the annual mean threshold (from 1.81 to 2.03 times) of the Vietnamese National Ambient Air Quality Standard. Based on the Pearson correlation analysis, significant influences of meteorological conditions on the pollution status of PM2.5 and surface O3 were also demonstrated, such as the different positive and negative correlations of each meteorological factor on concentration. These outstanding results serve as an essential reference for developing air quality targets and proposing future air pollutant control measures in Long An Province.
IHST (Integrated, Holistic, Spatial, and Thematic) Flood Management Model: The Integration of Flood Model, Green Infrastructure and Non-Structural Mitigation in the Urban Area of Barabai City
Authors: Tri Rendra Graha Dimas , Yudono Adipandang , Afrianto Firman
Published: September 2024

The January 2021 Floods paralyzed the entire Hulu Sungai Tengah Region, South Kalimantan Province, Indonesia, submerging 20,553 houses, causing minor damage to 2,973 houses, severe damage to 268 houses, and resulting in losses exceeding 53 million dollars. The Barabai Urban Area was one of the locations severely affected by flood. The flood management was conducted in the Barabai urban area to predict and visualize water movement during flooding, aiding in understanding and mitigating flood risks, as well as developing effective flood management strategies. The flood management was carried out adopted the IHST Model, which is the abbreviation from Integrated, Holistic, Spatial, and Thematic. The activities involve HECRAS 6.2 application, utilizing Google Earth terrain data, river geometry data, and flood discharge analysis based on the Nakayasu method. The analysis results highlighted the need for both structural and non-structural flood interventions. Non-structural interventions aiming to reduce vulnerability and enhance community capacity in facing flood. Structural developments involved the construction of storm water retention ponds and river embankments at specific locations based on the flood modelling results. The concept of polder and river embankment development was approached through green infrastructure principles, as flood management solutions should not only facilitate rapid water drainage but also improve soil absorption to prevent prolonged inundation.
Multidimensional dynamic control of optical skyrmions in graphene–chiral–graphene multilayers
Authors: Zhu Shuo , Lei Xinrui , Shen Xi , Hu Haifeng , Zhang Ni , Zhan Qiwen
Published: September 2024

Optical skyrmions are topological quasiparticles with a complex vectorial field structure. Their associated characteristics of ultra-small, ultra-fast and topological protection have great application prospects in high density data storage, light matter interaction and optical communication. At present, the research of optical skyrmions is still in its infancy, where the construction and flexible regulation of different topological textures are current research hotspot. Here, we combine the twist degree of freedom of materials and optical skyrmions. Based on graphene–chiral–graphene multilayers structure, we demonstrate the field mode symmetry and hybridization to form Bloch-type graphene plasmons skyrmion lattice. At the same time, by changing chirality parameter, the Fermi energy of graphene and the phase of incident light, multidimensional control of Bloch-type optical skyrmions can be realized. Our work demonstrated that the properties of materials provide the additional dimensions to regulate the topological states, and the combination of different materials structures provides the possibility for dynamic construction and manipulation of multiple topological states, which is expected to find applications in integrated nanophotonics devices.
Effect of promoters on the performance of CuNi catalysts for hydrogen production from methanol decomposition
Authors: Zhang Beidong , Jiang Yankun , Cong Le , Chen Yexin , Chen Lunhong , Yang Zhengdong
Published: September 2024

Utilizing the exhaust heat from engines to decompose methanol for hydrogen production, and subsequently introducing this hydrogen into the combustion chamber, is one of the crucial approaches for achieving energy savings and emission reductions. The role of an efficient and stable catalyst for methanol decomposition is paramount in this application. Therefore, CuNi-based catalysts modified with promoters such as Zr, La, Mn, and Mg were prepared using a stepwise impregnation method. The developed catalysts were tested using various analytical methods and characterization techniques. The results indicate that the addition of the Zr enhances the dispersion of active components, improves the catalyst’s reducibility. This, in turn, enhances the catalyst’s activity and hydrogen selectivity. The hydrogen yield of the Zr modified catalyst increased by an average of 12% compared to the original catalyst. Furthermore, the Zr modified catalyst exhibits exceptional stability after prolonged use. La can enhance the low-temperature activity of the catalyst but performs poorly at high temperatures. The promoter Mn has a minimal impact on the overall performance of the catalyst. Conversely, the addition of Mg as a promoter inhibits the dispersion of active components, resulting in adverse effects on the catalyst.
Effect of laser welding parameters on the microstructure and tensile properties of low-alloy high-strength steel
Authors: Li Weiji , Feng Aixin , Wang Yu , Wang Jun
Published: September 2024

The studying employed orthogonal experimental approach to optimize the laser welding process parameters for HC420LA low-alloy high-strength steel. Through metallographic analysis, microhardness testing, and tensile testing, the study assessed and contrasted the properties of laser-welded and arc-welded joints. The findings revealed that the most optimal laser welding conditions were 1.8 kW laser power, 2.5 m min−1 welding speed, and a focus distance of 1.5 mm, resulting in a well-formed ‘X’ shaped weld bead. Comparative analysis demonstrated that the laser-welded joint exhibited a finer microstructure, primarily composed of bainite and ferrite, whereas the arc-welded joint consisted of ferrite and martensite. Notably, the laser-welded joint exhibited superior mechanical properties, including increased microhardness and tensile strength, underscoring the distinct advantage of laser welding technology in high-strength steel welding, particularly in enhancing the weld joint’s quality and performance.
Experimental study on the mechanical behavior of laminates made by fiber steering: influence of fiber angle and tow width
Authors: Liu Chen , Tan Jing , Qiao Xiaoyao , Wang Xianfeng , Li Xingze , Xiao Jun
Published: September 2024

This work considers the effects of fiber trajectory and prepreg width on the material strength and failure behavior of variable stiffness composites. The test matrix was designed according to commonly used fiber placement trajectory and width of prepreg in engineering. Different trajectories were compared for tensile, compressive, bending, shear and CAI strengths. For tensile and compressive performance, curved ply specimens have varying degrees of decrease compared to straight ply specimens; For shear and bending performance, the optimal layup sequence is [±45/〈30|45〉]. For impact toughness, curved ply is significantly higher than straight ply, and the CAI strength of straight ply exceeds that of curved ply. For variable stiffness laminate with different fiber angles and tow widths, the maximum tensile, compressive and CAI strengths were reduced by up to 66%, 56%, and 27%, and the maximum bending strength, shear strength and impact toughness were increased by up to 53%, 23%, and 10.3%, respectively. The increase in width of prepreg leads to an increase in defects between fiber bundles which weakens the tensile/compressive performance but enhances the shear/bending performance.
Effects of resistance spot welding parameters on microstructure and mechanical properties of the dissimilar welded joint of quenching and partitioning steels
Authors: Yang Yonggang , Su Zexuan , Zuo Wangnan , Ni Daojun , Hu Yuantao , Wei Zhichao , Mi Zhenli
Published: September 2024

In this study, the effect of welding currents and welding times on the microstructure and mechanical properties of the dissimilar welded joints of Q&P980 and Q&P1180 steel was investigated. The macrostructure and microstructure of the dissimilar welded joints were characterized and the relationship between the welding parameters and the mechanical performance was analyzed using confocal laser scanning microscope, scanning electron microscope, and mechanical properties testers. Results show that with the increasing welding current and welding time, the nugget diameter, indentation rate, and maximum shear force of the dissimilar joint increase. The absorption energy of the dissimilar joint increases when the welding current rises, while it increases first and then decreases with elevating welding time. All the hardness distributions of the dissimilar Q&P980/Q&P1180 joints exhibit the highest hardness value in the fusion zone and a gradually decreasing hardness value in the heat-affected zone. Moreover, with increasing current and time, much higher hardness occurs at the FZ/HAZ boundary. The microstructure characterization illustrates the martensite fraction in the intercritical heat-affected zone of the Q&P1180 side is higher than that of the Q&P980 side after the welding process. With the increase of welding current and time, the lath martensite in the fusion zone gradually coarsens. The coarsening martensite and the nugget diameter are responsible for the change in the shear force and energy absorption of the dissimilar Q&P980/Q&P1180 joints.
Effect of x-ray irradiation on magnetocaloric materials, (MnNiSi)1-x(Fe2Ge)x and LaFe13-x-yMnxSiyHz
Authors: Nunez John Peter J , Sharma Vaibhav , Rojas Jessika V , Barua Radhika , Hadimani Ravi L
Published: September 2024

Understanding the behavior of magnetocaloric materials when exposed to high-energy x-ray irradiation is pivotal for advancing magnetic cooling technologies under extreme environments. This study investigates the magnetic and structural changes of two well-studied magnetocaloric materials, (MnNiSi)1−x(Fe2Ge)x composition (x = 0.34) and LaFe13-x-yMnxSiyHz composition (x = 0.30,y = 0.1.26 and z = 1.53) alloys upon irradiation. The alloys were exposed to x-ray radiation with a dosage of a continuous sweeping rate of ∼>120 Gy min−1 and an absorbed dose of 35 kGy . Both the samples didn’t show any observable crystal change after irradiation. There was a considerable change in magnetization at low applied magnetic fields in magnetization versus temperature measurements from 2.72 emu g−1 to 4.01 emu g−1 in the irradiated (MnNiSi)1−x(Fe2Ge)x sample and 4.41 emu g−1 to 5.49 emu/g for the LaFe13-x-yMnxSiyHz alloys. The Magnetization versus magnetic field isotherms near transition temperature exhibited irradiation-induced magnetic hysteresis for the (MnNiSi)1−x(Fe2Ge)x (x = 0.34) while the LaFe13-x-yMnxSiyHz samples did not result in any irradiation-induced magnetic hysteresis. In both the samples the magnitude of entropy change did not change due to irradiation however, the peak entropy change shifted to different temperatures in both the samples, (MnNiSi)1−x(Fe2Ge)x (x = 0.34), showed a maximum entropy change, ΔSmag of ∼ 11.139 J/kgK at 317.5 K compared to ΔSmag of ∼ 11.349 J/kgK at Tave peak of 312.5 K for the irradiated sample. LaFe13-x-yMnxSiyHz, pristine sample exhibited a maximum magnetic entropy change, ΔSmag ∼ 18.663 J/kgK, with the corresponding peak temperature, Tave peak, of 295 K compared to ΔSmag ∼ 18.736 J/kgK, at Tave peak of 300 K. It was determined that irradiation applied to the samples did not induce any structural or magnetic phase changes in the selected compositions but rather modified the magnetic properties marginally.
Enhanced the sensing sensitivity of the metamaterial absorbers with patterned convex graphene in the terahertz
Authors: Liu Yun , Ma Shilin , Xiong Zuhong , Xiong Bin , Cheng Lihong
Published: September 2024

In this paper, a patterned graphene metamaterial terahertz absorber is theoretically designed. The proposed absorber consists of a gold layer, a dielectric layer of SiO2, and graphene. The sensing sensitivity of the proposed absorber is simulated for the absence and presence of a square convex nanostructure, trapezoidal convex nanostructure, and rounded convex nanostructure. The sensitivity comparison between convex and absent convex nanostructures is studied, compared to no convex nanostructure, the simulated results show that the sensing sensitivity can be improved with the convex nanostructures, it is found that the absorber has two obvious absorption peaks, and it is insensitive to TE and TM polarization, and the maximum sensitivity corresponding to low-frequency and high-frequency modes is 0.911 THz RIU−1 and 1.561 THz RIU−1, respectively. Our work will play an important role in improving the sensing sensitivity of the graphene metamaterial absorber. Meanwhile, it can also greatly promote the application of biological sensing, modulation, integrated photodetectors, frequency selectors, sensors, filters and so on.
Carbon emissions reduction path of logistics industry in Hebei, China: based on internal factors
Authors: Lin Shuangjiao , Gao Yahao , Xu Shuting , Wu Tongyu , Li Minjie
Published: September 2024

To explore the optimal carbon emissions reduction path for the logistics industry in Hebei Province, China, this paper considers internal factors such as logistics agglomeration, transportation structure, and technology innovation as regulatory measures. The system dynamics method is employed to simulate the effects of carbon emissions reduction for each factor. Then, based on examining the interactive relationships among these internal factors, the paper proposes the optimal carbon emissions reduction path for Hebei Province’s logistics industry under different sequences of implementing the three measures. The results indicate that logistics agglomeration, transportation structure, and technological innovation can contribute to varying degrees of carbon emissions reduction in logistics. By 2030, it is projected that logistics agglomeration will result in a reduction of 21,799 million tons of carbon emissions while transportation structure and technology innovation will lead to reductions of 23,459 million tons and 20,778 million tons respectively compared to the BAU scenario. Furthermore, intricate interactions exist among these three internal measures. The optimal path for reducing carbon emissions is TSI-AGD-LTI. Specifically, to optimize the transportation structure first, relieve the pressure of logistics carbon emissions aggravated by logistics agglomeration, promote the cross-regional transfer of logistics carbon emissions, and then improve the level of technology innovation to strengthen further the logistics carbon emissions reduction effect of transportation structure adjustment.
A step closer towards active and flexible consumers: enhancing involvement through energy consumption feedback
Authors: Milev Ivana , Prislan Lev , Zajc Matej
Published: September 2024

The level of consumer awareness and comprehension, during a period of abundant energy services, has a crucial role in their initial adoption and later engagement with the services. Digital energy platforms bring the ≫intangible electricity≪ closer to people’s daily lives and encourage new ways of thinking about and consuming energy. Energy feedback connects consumer’s consumption to their daily activities and provides insights. It enables them to learn about the consumption, learn how to reduce or optimise it and later, learn how to be flexible when needed. Besides investigating how familiar are the Slovenian households with their own consumption and energy related behaviour, the goal of this paper is also to investigate their preferences in visualizing their electricity consumption. The consumption estimation was validated on real case study using data from 642 Slovenian households. Results show that consumers that use electricity for space and water heating, underestimated their consumption up to 22.5%. A categorization of households based on their water and space heating systems is also presented.
Climate change and extremes in the Mediterranean island of Cyprus: from historical trends to future projections
Authors: Lazoglou Georgia , Hadjinicolaou Panos , Sofokleous Ioannis , Bruggeman Adriana , Zittis George
Published: September 2024

Cyprus is a European island state in the eastern Mediterranean climate change hotspot. Despite being a relatively small island, it has diverse climatic zones, ranging from semi-arid to subhumid in the mountains and humid on Mount Olympos. Given the accelerated rate of environmental change in the region, the present study aims to identify, and update observed trends of critical climate parameters, highlighting vulnerable climatic areas within the island. Moreover, since nationwide multi-model assessments of future climate conditions are limited or outdated, we aim to investigate the range of future climate projections using a 21-member EURO-CORDEX ensemble under pathways RCP2.6 and RCP8.5. Besides mean conditions, we analyze various extreme climate indicators relevant to socio-economic activities such as agriculture, biodiversity, tourism, energy and water resources. Our historical analysis revealed a statistically significant increasing temperature trend (0.4 °C–0.6 °C per decade), which is more pronounced during the summer and spring. Concerning precipitation, the observed trends are not as robust, nevertheless, the southeastern coast and the central regions near the capital city of Nicosia are substantially drier and more prone to further changes in precipitation regimes. The projections for the end of the 21st century, according to the high radiative forcing scenario (RCP8.5), indicate that Cyprus is likely to experience an annual temperature increase of over 4 °C and an approximate 20%–30% reduction in annual rainfall, relative to 1981–2000. These projections highlight an alarming trend that requires urgent attention and proactive measures to mitigate the potential impacts of climate change on the island.
Review of biodiversity assessment and resource management orientation for sustainable rural development in Lang Son province, Vietnam
Authors: Thi Thanh Hue Hoang , Quan Pan Ze , Lap Kieu Quoc
Published: September 2024

This study examines the conservation and biodiversity management efforts in Lang Son province, Vietnam, in the context of global environmental concerns. Under Decision No 2447/QD-UBND, the province’s Special-use Forest Planning focuses on conserving areas such as the Huu Lien Nature Reserve and the Mau Son special-use forests. This initiative covers a substantial planned land area to sustain biodiversity and foster rural development up to 2030. Recent surveys indicate a notable increase in plant species within these areas, from 842 species in 2017 to 961 in 2019, and significant efforts towards conserving endangered species like the Asiatic black bear and the Annam flying frog. The province encompasses diverse ecosystems spread across 832,075.82 ha, characterized by varied terrains and climates contributing to its rich biodiversity. These regions are crucial for various species, including those listed in conservation documents, such as the 77 plant species recorded. RAP-Plant analysis and Monte Carlo simulation indicate that Lang Son’s biodiversity, with a Shannon index of 2.85 and Simpson index of 0.75, is threatened by a projected forest area decline to 514,578.61 ha by 2040, risking extinction for rare species like Hoang dan and Lan kim tuyen. Furthermore, Lang Son’s strategic initiatives towards sustainable agricultural practices, forest management, and restoration efforts highlight the integration of biodiversity conservation into broader socio-economic development plans. The province’s approach aligns with global strategies emphasizing the protection of endangered and endemic species as essential to maintaining ecological balances and supporting sustainable development. This study underscores the importance of comprehensive regional planning and community engagement in biodiversity conservation efforts to mitigate economic development, illegal activities, and climate change challenges. Threats such as illegal logging and habitat fragmentation persist, necessitating more vital community-based conservation efforts and robust legal frameworks.
The influence of public awareness on public participation in environmental governance: empirical evidence in China
Authors: Zhang Lisha , Yue Mingyang , Qu Lingfei , Ren Biao , Zhu Tao , Zheng Rong
Published: September 2024

Public participation in environmental governance is conducive to alleviating environmental pollution. To mobilize the enthusiasm of the public to participate in environmental governance, using nationwide Chinese General Social Survey (CGSS) samples on China, we analyse the influence of public awareness on four kinds of public participation in environmental governance: conscious participation, induced participation, input participation and ex-post participation. The results show that awareness of environmental risk and media usage positively affect the four kinds of public participation behaviours. Public members with a frugal lifestyle tend to be induced to participate. Awareness of governmental interactions promotes public participation, especially input participation behaviour, in environmental governance. Public members with positive legal awareness tend to opt for ex-post participation. Unobstructed channels of environmental rights protection and higher levels of environmental cognition are important factors in promoting public participation in environmental governance. However, the public’s low evaluation of government environmental governance and the public’s pursuit of short-term economic interests reduces enthusiasm for participation. The results passed the endogeneity and robustness tests. As real local environmental governance is not always consistent with the public’s evaluation of it, the inconsistency may influence public participation in environmental governance.
Synergy of nitrogen dopants and cobalt single atoms in calcium niobate nanosheets for photocatalytic oxygen evolution
Authors: ul Haq Sajjad , Dong Chung-Li , Huang Yu-Cheng , Moiz ur Rehman Rana , Djatoubai Essossimna , Lin Zhi , Khan Muhammad Shuaib , Shen Shaohua
Published: September 2024

The successful separation of photoexcited charge carriers and their effective utilization are crucial for overcoming the slow kinetics of the four-electron process for photocatalytic oxygen evolution. Herein, a novel strategy utilizing urea as a source of N-doping on Ca2Nb3O10 nanosheets is adopted, followed by the successful deposition of Co single atoms (Co-SAs) to achieve a synergistic effect. The presence of N-dopants and Co-SAs is validated via various experimental techniques. It is also observed that the presence of N-doping contributed towards the deposition of higher content of Co-SAs (0.21 wt%) in Ca2Nb3O10−x
N
x
-CoSA nanosheets compared to 0.15 wt% for non-doped Ca2Nb3O10-CoSA. The optimized Ca2Nb3O10−x
N
x
-CoSA nanosheets exhibited an impressive photocatalytic O2 evolution of ∼727.22 µmol g−1 h−1 via the synergy of N-dopants and Co-SAs. As a result, the O2 evolution response of Ca2Nb3O10−x
N
x
-CoSA is 3.6 times higher than that of pristine Ca2Nb3O10 nanosheets (201.26 µmol g−1 h−1), 2.24 times better than Ca2Nb3O10−x
N
x
nanosheets (323.42 µmol g−1 h−1), and 1.77 times higher compared to Ca2Nb3O10-CoSA, (409.33 µmol g−1 h−1), which clearly demonstrated the synergistic effect of N-dopants and Co-SAs in Ca2Nb3O10−x
N
x
-CoSA nanosheets. Based on the findings of various characterization techniques, the co-presence of N-dopants and Co-SAs is observed to contribute towards better charge carrier separation, and utilization to achieve superior photocatalytic response. Thus, this study presents a novel approach for incorporating N-dopants and Co-SAs on Ca2Nb3O10 nanosheets, which can be extended to a wide range of nanosheets produced by the soft chemical exfoliation method.
The impact of pulsed Nd:YAG laser on the surface of n-Si and photo-electrical performance of silicon solar cells
Authors: Mohd Rais Ahmad Rujhan , Mohd Sinin Nurul Aqidah , Abdul Hamid Siti Nor Fazlina , Sopian Kamaruzzaman , Sepeai Suhaila
Published: September 2024

Texturizing the surface of a silicon solar cell enhances performance by reducing reflection losses. Pyramidal texturization via wet chemical etching is standard in manufacturing, while plasma etching is often used for vertical hole texturization. Laser texturization offers a chemical-free, user-friendly alternative to plasma etching. Infrared (IR) transmission studies indicate that laser-textured samples transmit more IR light through n-Si than normally textured samples, suggesting that vertical grooves from laser texturization allow deeper light penetration. Analyses using cross-sectional Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersion x-ray (EDX), and Energy Dispersive Spectroscopy (EDS) demonstrate the effects of laser texturization on the front surface of textured n-Si wafers. However, silicon solar cells with laser-textured surfaces demonstrated lower conversion efficiencies (1.20% to 4.30%) compared to conventionally textured cells (14.30%). The short-circuit current density (JSC) was also lower in laser-textured cells, below 17 mA cm−2, compared to 34.44 mA cm−2 in normally textured cells. At the same time, higher laser power (114 W) during texturization also led to the lowest JSC and open-circuit voltage (VOC), indicating that laser texturization may introduce defects and dislocations that degrade Si properties.
Characterization of Taguchi optimized fiber reinforced copper slag concrete composites with strength properties
Authors: Dayal Deepak , Panda Swetapadma , Sarkar Pradip
Published: September 2024

Establishing the ideal design has always been a difficulty for concrete engineers because of the inclusion of many alternative construction materials particularly when dealing with the incorporation of slag elements and fibers in concrete mix design. In this study, the Taguchi optimization method is implemented to predict the optimal mix design of fiber reinforced copper slag aggregate concrete (FRCSC) with mechanical strength properties. For this purpose, different parameters influencing mechanical strength were defined based on the available literature. The Taguchi approach was subsequently applied to develop an orthogonal array of parameters, and experimental tests were carried out in accordance with the suggested design array to acquire experimental data for each and every strength property. Three major influencing parameters like fiber length (FL), fiber percentage (FP), and copper slag content (CS) were considered in order to get optimal mix design for FRCSC. Analysis of variance was also employed to evaluate the effective factors on compressive, split-tensile, flexural, water absorption and void content properties for FRCSC. It was found that the proposed method was effective in finding the optimal mixture design from strength point of FRCSC and the experimental results indicated a significant improvement in five selected strength properties of FRCSC. From the results of Taguchi analysis, it can be concluded that, for five selected strength properties, 60% CS + 1% of fiber + 20 mm of fiber length is the optimal mix design combination for FRCSC. Finally, physical and microstructural characterization through FESEM and EDX were carried out to have a closer justification for the test results.
The Bourbaki degree of a plane projective curve
Authors: Jardim Marcos , Nasrollah Nejad Abbas , Simis Aron
Published: September 2024

Bourbaki sequences and Bourbaki ideals have been studied by several authors since its inception sixty years ago circa. Generic Bourbaki sequences have been thoroughly examined by the senior author with B. Ulrich and W. Vasconcelos, but due to their nature, no numerical invariant was immediately available. Recently, J. Herzog, S. Kumashiro, and D. Stamate introduced the Bourbaki number in the category of graded modules as the shifted degree of a Bourbaki ideal corresponding to submodules generated in degree at least the maximal degree of a minimal generator of the given module. The present work introduces the Bourbaki degree as the algebraic multiplicity of a Bourbaki ideal corresponding to choices of minimal generators of minimal degree. The main intent is a study of plane curve singularities via this new numerical invariant. Accordingly, quite naturally, the focus is on the case where the standing graded module is the first syzygy module of the gradient ideal of a reduced form

f
∈
k
[
x
,
y
,
z
]

f\in k[x,y,z]

– i.e., the main component of the module of logarithmic derivations of the corresponding curve. The overall goal of this project is to allow for a facet of classification of projective plane curves based on the behavior of this new numerical invariant, with emphasis on results about its lower and upper bounds.