bluuebunny/crossref_metadata_2025_split huggingface dataset:
Metasurface-based bandwidth and isolation enhancement for compact H-plane coupled antennas
Authors: Wei Xin , Wang Guangming , Wang Yawei , Zou Xiaojun , Tian Chao , Bai Hao , Yu Zhongwu , Cai Tong 
Published: December 2023

Abstract
A simple metasurface (MS) composed of a square metal ring and four extended metal strips is designed to simultaneously enhance the bandwidth and isolation of H-plane coupled microstrip patch antenna array in this paper. By adding the MS above the patch array, a new resonance is formed to increase the working bandwidth and the coupling between the antenna array is largely depressed to enhance the isolation property. An antenna array with MS is simulated, fabricated and measured. The simulated and measured results are in good agreements. Measured results indicate that the bandwidth with S
11 ⩽ −10 dB is broadened by 8.1% compared with the original coupled antennas. In addition, within the working band, the isolation level is better than −20 dB, and the maximum mutual coupling reduction reaches 39.6 dB at 5.19 GHz, performing an excellent wideband decoupling effect. Moreover, the proposed method has been extended to large antenna arrays, implying that it can be widely used in multiple-input multiple-output or the wireless Rx/Tx system.
Dielectric performance improvement of polypropylene film modified by γ-ray irradiation for HVDC capacitors
Authors: Xiao Meng , Wang Kaixu , Song Yuning , Du Boxue 
Published: December 2023

Abstract
Polypropylene (PP) films exhibit low dielectric strength and high losses under elevated temperatures and strong electric field environments. This paper proposes a method to improve the dielectric properties based on γ-ray irradiation crosslinking, investigates the effect of the type of sensitizer on the crosslinking reaction, and explores the effect of crosslinking structure on the dielectric properties of PP films such as breakdown strength. The results showed that the type of group in the sensitizer influenced its activity in the crosslinking reaction, and the modified films added with pentaerythritol triacrylate (PETA) exhibited the highest crosslinking degree of 25.68%. In addition, it was found that the crosslinked structure improved the stability of the molecular chains at high temperatures and reduced the probability of thermal breakdown. At 115 °C, the modified films with PETA showed a 72.5% reduction in conductivity and a 33.6% increase in breakdown strength. This method demonstrates the importance of irradiation crosslinking modification for improving the reliability of PP films in high-temperature and strong electric field applications.
Room-temperature ferromagnetic CoSe2 nanoplates synthesized by chemical vapor deposition
Authors: Tian Sen , Wang Wenjie , Zhao Mengfan , Han Yilin , Tian Yuxin , Ji Shengxiang , Yao Liang , Liu Lixuan , Ling Feifei , Jia Zhiyan , Zhang Fang 
Published: December 2023

Abstract
Among novel two-dimensional materials, transition metal dichalcogenides (TMDs) with 3d magnetic elements have been extensively researched owing to their unique magnetic, electric, and photoelectric properties. As an important member of TMDs, CoSe2 is an interesting material with controversial magnetic properties, hitherto there are few reports related to the magnetism of CoSe2 materials. Here, we report the synthesis of CoSe2 nanoplates on Al2O3 substrates by chemical vapor deposition (CVD). The CVD-grown CoSe2 nanoplates exhibit three typical morphologies (regular hexagonal, hexagonal, and pentagonal shapes) and their lateral sizes and thickness of CoSe2 nanoplates can reach up to hundreds of microns and several hundred nanometers, respectively. The electric-transport measurement shows a metallic feature of CoSe2 nanoplates. Furthermore, the slanted hysteresis loop and nonzero remnant magnetization of the CoSe2 nanoplates confirm the ferromagnetism in the temperature range of 5–400 K. This work provides a novel platform for designing CoSe2-based spintronic devices and studying related magnetic mechanisms.
Andreev reflection in graphene nanoribbons induced by d-wave superconductors
Authors: Takagaki Y 
Published: December 2023

Abstract
Honeycomb and square lattices are combined as a tight-binding model to examine the Andreev reflection in graphene nanoribbons induced by a superconductor. The superconducting symmetry is assumed to be the d-wave. The zero-bias tunneling conductance peak, which is generally produced by the d-wave superconductor, is absent for the nanoribbons under conditions similar to those when a quantum wire is the normal conductor. For the anisotropic superconductivity, propagating modes appear in the superconductor even for biases below the top of the superconducting energy gap. Features appear in the conductance at the subgap population thresholds of these propagating modes as a finite-size effect of the lattice system. The surface Andreev bound states responsible for the zero-bias anomaly also cause transport resonances in the vicinity of the zero bias despite the aforementioned destruction of the anomaly. The conductance spectra revealing these excitation behaviors are fairly unchanged regardless of the presence of a hopping barrier at the interface with the superconductor. The insensitivity to the interface scattering highlights the fact that barrier-less situation cannot be realized for the model due to the heterogeneous lattice. Concerning specular Andreev reflection, the wavefunction parity gives rise to its blocking for single-mode zigzag-edged nanoribbons. The blocking is suppressed when the anisotropic superconductivity is asymmetric for the nanoribbons.
A miniaturized spot-focusing microwave sensor for broad-band reflectivity measurements
Authors: Fang Yang , Hui Peilin , Chen Zhenmao , Li Yong , Xie Shejuan , Chen Hongen 
Published: December 2023

Abstract
This study presents a novel spot-focusing microwave sensor designed for on-site monitoring of absorbing materials and coatings, a critical process in assessing the performance of equipment in service. The sensor addresses the challenge of integrating miniaturization, wide bandwidth, and focused radiation-requirements that are typically at odds in microwave sensor design. The developed approach utilizing a multi-layer lens nesting structure to achieve narrow-beam radiation over an ultra-wideband (UWB) frequency range. Each layer of the lens system is engineered to concentrate beams within specific frequency bands, enabling consistent performance across a broad spectrum. In addition, we introduce a composite feeding structure characterized by exponential gradient slots that enhance UWB performance while minimizing cross-polarization effects. The sensor demonstrates exceptional capabilities, achieving over 8 dB of radiation gain and maintaining a voltage standing wave ratio (VSWR) under 2.5 within a 2–22 GHz frequency band. Its compact size (95 mm in diameter and 75 mm in height) does not compromise its ability to emit a Gaussian beam with a narrow radiation pattern of less than ±30°, simulating plane-wave characteristics essential for near-field on-site measuring. Accompanying the sensor is a novel on-site reflectivity measuring method that leverages time-domain gating technology to mitigate interference signal impact. Measurement results validate the sensor and method’s precision, with an average error margin of 0.78 dB. This breakthrough in sensor design and methodology marks a significant advancement in the on-site evaluation of absorbing materials and coatings.
A wave energy driven high-performance self-powered oil spill positioner
Authors: Li Zhaozhao , Chen Li , Zhang Bin , Jiang Xin , Zhang Jinnan , Zhang Shibo 
Published: December 2023

Abstract
The oil spill positioner is capable of real-time monitoring oil films on the sea surface. However, the lack of high-performance power supply methods greatly restricts the application of oil spill positioner. In this research, we design a high-performance self-powered oil spill positioner based on a soft-contact-triboelectric-nanogenerator (SC-TENG). This device achieves soft-contact by attaching rabbit fur to the rotor, which can effectively reduce frictional resistance, quickly transfer charge to the electrode, and improve the durability of the parts. First, we calculate the highest occupied molecular orbital and the lowest unoccupied molecular orbital of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) molecules through first-principles simulations, and compared the ease of electron excitation between the two materials. The results show that the performance of SC-TENG with PVDF as dielectric material is significantly better than that of PTFE. At the same time, this phenomenon has been confirmed by experiments. On the basis of experimental and simulate research on two types of power management circuits, a bridge rectifier circuit with the function of converting alternating current to direct current is selected to realize the self-power supply of the oil spill positioner. Additionally, by optimizing the structure of the SC-TENG and employing a bridge rectifier circuit, the SC-TENG can achieve a maximum open-circuit voltage of 1400 V and a short-circuit current of 3.49 μA, which are enough to light up 200 light-emitting diodes and power the oil spill positioner. Finally, we simulate the open-circuit voltage and short-circuit current of the SC-TENG on a six-degree-of-freedom platform and test its durability under real-world ocean wave conditions, all of which show excellent performance. This work develops an efficient wave energy conversion mechanism and successfully realizes the high-performance self-powering of the oil spill positioner, making oil spill monitoring more flexible and reliable.
Ferromagnetic insulating substrate for magnetic proximity studies: LaCoO3 thin film
Authors: Lee Yeonjae , Kim Youngdo , Lee Sangjae , Kim Changyoung 
Published: December 2023

Abstract
Ferromagnetic insulators (FMIs) are intriguing not only due to their rare nature, but also due to their potential applications in spintronics and various electronic devices. One of its key promising applications is based on an FMI-induced magnetic proximity effect, which can impose an effective time-reversal symmetry breaking on the target ultrathin layer to realize novel emergent phenomena. Here, we conduct systematic studies on thin film LaCoO3, an insulator known to be ferromagnet under tensile strain, with varying thicknesses, to establish it as an FMI platform to be integrated in heterostructures. The optimal thickness of the LaCoO3 layer, providing a smooth surface and robust ferromagnetism with large remanence, is determined. A heterostructure consisting of an ultrathin target layer (2 uc SrRuO3), the LaCoO3 FMI layer, and the La0.5Sr0.5CoO3 conducting layer has been fabricated and the angle-resolved photoemission spectroscopy measurement on the multi-layer system demonstrates a sharp Fermi edge and a well-defined Fermi surface without the charging effect. This demonstrates the feasibility of the proposed heterostructure using LaCoO3 thin film as the FMI layer, and further lays a groundwork to investigate the magnetic proximity induced phases in quantum materials.
Facile synthesis of β-Ga2O3 based high-performance electronic devices via direct oxidation of solution-processed transition metal dichalcogenides
Authors: Feria Denice Navat , Huang Qi-Zhi , Yeh Chun-Shao , Lin Shi-Xian , Lin Der-Yuh , Tseng Bo-Chang , Lian Jan-Tian , Lin Tai-Yuan 
Published: December 2023

Abstract
Gallium oxide (Ga2O3) is a promising wide bandgap semiconductor that is viewed as a contender for the next generation of high-power electronics due to its high theoretical breakdown electric field and large Baliga’s figure of merit. Here, we report a facile route of synthesizing β-Ga2O3 via direct oxidation conversion using solution-processed two-dimensional (2D) GaS semiconducting nanomaterial. Higher order of crystallinity in x-ray diffraction patterns and full surface coverage formation in scanning electron microscopy images after annealing were achieved. A direct and wide bandgap of 5 eV was calculated, and the synthesized β-Ga2O3 was fabricated as thin film transistors (TFT). The β-Ga2O3 TFT fabricated exhibits remarkable electron mobility (1.28 cm2 Vs−1) and a good current ratio (I
on/I
off) of 2.06 × 105. To further boost the electrical performance and solve the structural imperfections resulting from the exfoliation process of the 2D nanoflakes, we also introduced and doped graphene in β-Ga2O3 TFT devices, increasing the electrical device mobility by ∼8-fold and thereby promoting percolation pathways for the charge transport. We found that electron mobility and conductivity increase directly with the graphene doping concentration. From these results, it can be proved that the β-Ga2O3 networks have excellent carrier transport properties. The facile and convenient synthesis method successfully developed in this paper makes an outstanding contribution to applying 2D oxide materials in different and emerging optoelectronic applications.
Electrical, thermal and noise properties of platinum-carbon free-standing nanowires designed as nanoscale resistive thermal devices
Authors: Piasecki Tomasz , Kwoka Krzysztof , Gacka Ewelina , Kunicki Piotr , Gotszalk Teodor 
Published: December 2023

Abstract
Platinum-carbon (PtC) composite nanowires were fabricated using focused electron beam induced deposition and postprocessed, and their performance as a nanoscale resistive thermal device (RTD) was evaluated. Nanowires were free-standing and deposited on a dedicated substrate to eliminate the influence of the substrate itself and of the halo effect on the results. The PtC free-standing nanowires were postprocessed to lower their electrical resistance using electron beam irradiation and thermal annealing using Joule heat both separately and combined. Postprocessed PtC free-standing nanowires were characterized to evaluate their noise figure (NF) and thermal coefficients at the temperature range from 30 K to 80 °C. The thermal sensitivity of RTD was lowered with the reduced resistance but simultaneously the NF improved, especially with electron-beam irradiation. The temperature measurement resolution achievable with the PtC free-standing nanowires was 0.1 K in 1 kHz bandwidth.
Intensity-modulated proton and carbon-ion radiotherapy using a fixed-beam system for locally advanced lung cancer: dosimetric comparison with x-ray radiotherapy and normal tissue complication probability (NTCP) evaluation
Authors: Ming Xue , Mao Jingfang , Ma Ningyi , Chen Jian , Wang Weiwei , Sheng Yinxiangzi , Wu Kailiang 
Published: December 2023

Abstract

Objective. To assess the dosimetric consequences and the normal tissue complication probability (NTCP) for the organs at risk (OARs) in intensity-modulated particle radiotherapy of proton (IMPT) and carbon-ion (IMCT) using a fixed-beam delivery system when compared with intensity-modulated photon radiotherapy (IMRT) for locally advanced small-cell lung cancer. Approach. The plans were all designed under the same total relative biological effectiveness (RBE)-weighted prescription dose, in which the planning target volume (PTV) of the internal gross target volume(IGTV) and the PTV of the clinical target volume was irradiated with 69.3 Gy (RBE) and 63 Gy (RBE), respectively, using a simultaneously integrated boosting (SIB) technique. NTCPs were estimated for heart, lung, esophagus and spinal cord by Lyman–Kutcher–Burman (LKB) and logistic models. Dose escalation was simulated under the desired NTCP values (0.05, 0.10 and 0.50) of the three radiation techniques. Main results. Under the similar target coverage, almost all OARs were significantly better spared (p < 0.05) when using the particle radiotherapy except for D1cc (the dose to 1 cm3 of the volume) of the proximal bronchial tree (p > 0.05). At least 57.6% of mean heart dose, 28.8% of mean lung dose and 19.1% of mean esophageal dose were reduced compared with IMRT. The mean NTCP of radiation-induced pneumonitis (RP) in the ipsilateral lung was 0.39 ± 0.33 (0.39 ± 0.31) in IMPT plans and 0.36 ± 0.32 (0.35 ± 0.30) in IMCT plans compared with 0.66 ± 0.30 (0.64 ± 0.28) in IMRT plans by LKB (logistic) models. The target dose could be escalated to 78.3/76.9 Gy (RBE) in IMPT/IMCT plans compared with 61.7 Gy (RBE) in IMRT plans when 0.50 of NTCP in terms of RP in the ipsilateral lung was applied. Significance. This study presents the potential of better control of the side effects and improvement of local control originating from the dosimetric advantage with the application of IMPT and IMCT with the SIB technique for locally advanced lung cancer, even with limited beam directions.
Single-pulse electrical stimulation artifact removal using the novel matching pursuit-based artifact reconstruction and removal method (MPARRM)
Authors: Xie Tao , Foutz Thomas J , Adamek Markus , Swift James R , Inman Cory S , Manns Joseph R , Leuthardt Eric C , Willie Jon T , Brunner Peter 
Published: December 2023

Abstract

Objective. Single-pulse electrical stimulation (SPES) has been widely used to probe effective connectivity. However, analysis of the neural response is often confounded by stimulation artifacts. We developed a novel matching pursuit-based artifact reconstruction and removal method (MPARRM) capable of removing artifacts from stimulation-artifact-affected electrophysiological signals. Approach. To validate MPARRM across a wide range of potential stimulation artifact types, we performed a bench-top experiment in which we suspended electrodes in a saline solution to generate 110 types of real-world stimulation artifacts. We then added the generated stimulation artifacts to ground truth signals (stereoelectroencephalography signals from nine human subjects recorded during a receptive speech task), applied MPARRM to the combined signal, and compared the resultant denoised signal with the ground truth signal. We further applied MPARRM to artifact-affected neural signals recorded from the hippocampus while performing SPES on the ipsilateral basolateral amygdala in nine human subjects. Main results. MPARRM could remove stimulation artifacts without introducing spectral leakage or temporal spread. It accommodated variable stimulation parameters and recovered the early response to SPES within a wide range of frequency bands. Specifically, in the early response period (5–10 ms following stimulation onset), we found that the broadband gamma power (70–170 Hz) of the denoised signal was highly correlated with the ground truth signal (

R
=
0.98
±
0.02

, Pearson), and the broadband gamma activity of the denoised signal faithfully revealed the responses to the auditory stimuli within the ground truth signal with

94
%
±
1.47
%

sensitivity and

99
%
±
1.01
%

specificity. We further found that MPARRM could reveal the expected temporal progression of broadband gamma activity along the anterior-posterior axis of the hippocampus in response to the ipsilateral amygdala stimulation. Significance. MPARRM could faithfully remove SPES artifacts without confounding the electrophysiological signal components, especially during the early-response period. This method can facilitate the understanding of the neural response mechanisms of SPES.
Gradient Gibbs measures with periodic boundary laws of a generalized SOS model on a Cayley tree
Authors: Haydarov F H , Ilyasova R A 
Published: December 2023

Abstract
We consider gradient Gibbs measures corresponding to a periodic boundary law for a generalized solid-on-solid (SOS) model with spin values from a countable set on a Cayley tree. On the Cayley tree, detailed information on gradient Gibbs measures for models of SOS type is given in Botirov and Haydarov (2020 J. Stat. Mech. 093102), Henning et al (2019 Electron. J. Probab.
24 104), Haydarov and Rozikov (2022 Rep. Math. Phys.
90 81–101) and Kulske and Schriever (2017 Markov Process. Relat. Fields
23 553–90). We continue this work for the generalized SOS model. Namely, in this paper, the problem of finding gradient Gibbs measures which correspond to periodic boundary laws is reduced to a functional equation and, by solving this equation, all gradient Gibbs measures with four periodic boundary laws are found.
PCM-based domestic solar water heating in Malaysia: Setbacks and countermeasures
Authors: Fadzlin Wan Afin , Hasanuzzaman Md. , Rahim Nasrudin Abd 
Published: December 2023

Abstract
Solar water heating (SWH) systems have yet to be widely employed despite their promising features for hot water production, especially in rural areas. This paper discusses several setbacks to the implementation of SWH systems. Generally, the setbacks are related to weather issues, the collector’s technical damages, and financial constraints. A few potential countermeasures to these setbacks are also listed.
Investigation of Thermal Performance and Chemical Stability of Metal Infused Salt Hydrate Phase Change Material for Thermal Energy Storage
Authors: Pandey AK , Reji Kumar R , Samykano M , Buddhi D , Tyagi VV 
Published: December 2023

Abstract
Thermal energy storage (TES) is a technique that is considered a very desirable technology with a high potential to overcome the gap between demand and supply. Phase change materials (PCMs) are considered to be a highly favourable thermal energy storage materials. Besides that, PCM has certain drawbacks, such as lower thermal conductivity and higher light transmission; owing to this, the heat transfer rate and energy storage density are less. The performance of the PCMs can be improved by adding highly conductive nanoparticles. In this study, various weight percentages (0.1% - 5.0%) of Copper (II) oxide nanoparticles are dispersed with salt hydrate phase change materials with melting temperature 50 °C and investigated the thermal and chemical properties using Thermogravimetric analyzer, thermal conductivity analyzer, and Fourier transform infrared spectrum. Results shows that the prepared nanocomposites have chemically and thermally stable up to 467 °C. The thermal conductivity was increased by 62.64%, at 3.0 wt% Copper (II) oxide with salt hydrate PCM. The developed nanocomposites have better thermophysical properties than pure salt hydrate, which may be applied for TES applications like solar water heating, photovoltaic thermal systems, and electronic cooling systems.
Effect of lead sintering aid to TiO2 photoanode for flexible dye sensitized solar cell
Authors: Khir H , Pandey A K , Saidur R , Ahmad M S , Dewika M , Samykano M 
Published: December 2023

Abstract
The commercial application of flexible dye sensitized solar cells (DSSCs) is somewhat limited due to the devices’ low conversion efficiency. The low sintering temperature in preparing the photoanode has caused poor interparticle contact, low charge transfer and low efficiency. Hence, this research aims to improve the interparticle contact of titanium dioxide (TiO2) photoanode with the novel use of lead (Pb) nanoparticles as sintering aid at low temperature. TiO2-Pb composite photoanode was prepared with different composition of Pb including 4% and 7% sintered at low temperature of 250°C. The research discovered that TiO2 photoanode mixed with 4% Pb composition showed the lowest charge transfer resistance (RCT) even at low sintering temperature. The RCT value was even lower than a commercial TiO2 photoanode sample that was sintered at 450°C. The addition of Pb sintering aid has improved interparticle contact in the photoanode via the neck formation at the TiO2-Pb interface and enhanced charge transfer despite the low temperature. The prepared photoanode samples displayed potential in developing highly efficient flexible DSSC.