bluuebunny/crossref_metadata_2025_split huggingface dataset:
Density functional theory study of Zn(1−x)FexSe: Electronic structure, phonon, and magnetic properties
Authors: Habura Kunsa Haho , Afrassa Mesfin Asfaw , Hone Fekadu Gashaw 
Published: March 2023

In this article, density functional theory is used to explore the electronic structure, phonon, and magnetic properties of Zn(1−x)FexSe (for x = 0%, 6.25%, 12.5%, 25%, and 50%). The electronic structure, phonon properties, and magnetic properties of the systems were examined using the generalized gradient approximation (GGA) and with Hubbard correction (GGA + U), where U is a Hubbard parameter. The calculated lattice parameter is 5.65 Å, which is quite close to the experimental lattice parameter of ZnSe, 5.66 Å. In this study, the GGA+U provides a better bandgap approximation (Eg = 1.3708 eV) than the GGA (Eg = 1.229 eV), which is consistent with experimental results and values previously reported. According to our results, the iron-doped zinc selenide exhibits antiferromagnetic coupling for a percentage of substitution greater than 12.5%. In addition, for an iron substitution of 12.5% with the distance between dopant atoms exceeding 5.6364 Å, it tends to exhibit ferromagnetic properties. Therefore, the iron-doped zinc selenide manifests the dilute magnetic semiconductor and can be considered to enhance its applications in the field of spintronics and magneto-optical devices based on further experimental results.
GeTe ultrathin film based phase-change memory with extreme thermal stability, fast SET speed, and low RESET power energy
Authors: Meng Yingjie , Chen Yimin , Peng Kexin , Chen Bin , Gu Chenjie , Gao Yixiao , Wang Guoxiang , Shen Xiang 
Published: March 2023

We designed the phase-change memory (PCM) cell based on ultrathin GeTe film (∼10 nm) and homemade nanoscale electrode filling craft to improve data retention ability and reduce programming energy, respectively. It was found that the temperature for ten years’ data retention of this ultrathin GeTe film is 160 ± 32.8 °C, which is much higher than that of conventional Ge2Sb2Te5 (GST, 83 ± 20.6 °C) film. Benefit to the nature of fragile-to-strong crossover behavior in GeTe supercooled liquids that was confined in a two-dimension structure, a fast SET speed of 6 ns is also detected in this ultrathin GeTe PCM. Moreover, the RESET power consumption of this ultrathin GeTe PCM is measured as 1.8 ± 0.5 nJ, and it is much lower than that of GST PCM (16.5 ± 1.5 nJ), which is attributed to the nanoscale electrode of the devices. The above-mentioned improvements enable the application of ultrathin GeTe PCM in neuromorphic computing.
Preparation and characterization of sodium dodecyl sulfate/Ag nanoparticles constituting branched microfibers
Authors: Almarashi Jamal Q. M. 
Published: March 2023

Branched microfibers of sodium dodecyl sulfate/Ag nanoparticles were synthesized using a nanosecond laser at a wavelength of 532 nm. The synthesis process was investigated at three laser intensities (0.38, 0.76, and 1.53 MW/cm2) and five exposure times (5, 15, 30, 45, and 60 min). At intensities of 0.38 and 0.76 MW/cm2, with increasing the exposure time, the number of nanoparticles increases until an exposure time of 30 min. Above this, exposure saturation of the number of Ag nanoparticles takes place. A similar effect was detected for the size of nanoparticles at these laser intensities. The saturation effect begins at 5 min of exposure for a laser intensity of 1.53 MW/cm2. The estimated nanoparticle size ranges from 116 to 120 nm based on the exposure time for a laser intensity of 0.38 and 0.76 MW/cm2, respectively. Scanning electron microscopy images at low magnification show the branched microfiber structure, while at higher magnifications, nanoparticles of Ag covering these microfibers appear. Electron dispersion x-ray spectroscopy confirmed the presence of Ag. X-ray diffraction results for the particles deposited on a fluorine-doped tin oxide-coated glass substrate were discussed.
Straightforward synthesis of monodisperse Co/Zn-based nanoparticles and their antifungal activities on Botrytis cinerea
Authors: Freire Rafael M. , Silva-Moreno Evelyn , Robles-Kelly Christian , Infante Claudia D. , Denardin Juliano C. , Michea Sebastian 
Published: March 2023

Herein, we have displayed an easy way to produce monodisperse spinel nanoparticles (NPs) and the antifungal activity of CoFe2O4, Co0.5Zn0.5Fe2O4 and ZnFe2O4 nanostructures. Firstly, the structural, morphological and magnetic properties of each NP were investigated through x-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and Vibrating Sample Magnetometer (VSM). The XRD data showed diffraction peaks related to the crystalline spinel phase. The TEM micrographs displayed monodisperse NPs with spherical morphology. The average sizes of CoFe2O4, Co0.5Zn0.5Fe2O4 and ZnFe2O4 NPs were 6.87 ± 0.05 nm, 5.18 ± 0.01 nm and 11.52 ± 0.09 nm, respectively. The VSM data indicated that the nanostructures are superparamagnetic at room temperature. Afterward, the antifungal properties of the Co/Zn-based ferrite NPs against Botrytis cinerea were tested. So, the inhibition of mycelial growth by different concentrations (45 – 360 ppm) of NPs was measured. The most effective nanostructure was CoFe2O4, with an EC50 value of 265 ppm. Further, to elucidate how the NPs are affecting B. cinerea, reactive oxygen species (ROS) production was measured. The results indicated that the CoFe2O4 monodisperse NPs could induce a burst of ROS in B. cinerea, promoting cellular damage.
Effect of Co/P micro-alloying on stress relaxation behaviour of Cu-15Ni-8Sn alloy
Authors: Yahui Gong , Chengjun Guo , Jian Huang , Yufan Shi , Xiangpeng Xiao , Guihuan An , Bin Yang 
Published: March 2023

To improve the stress relaxation resistance of the Cu-5Ni-S8n alloy, the effects of Co or P addition on its stress relaxation resistance were investigated by scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction), X-ray diffraction, and high-temperature creep durability tester. The results revealed that the relaxation rate increased dramatically as the temperature rose. The thermal stress relaxation resistance of Cu-15Ni-8Sn alloy was significantly improved with Co addition; After 100 h of stress relaxation tests at 200°C or 250°C, the residual stress value of the Cu-15Ni-8Sn alloy increased by 23 MPa or 22 MPa with Co addition, which was associated with the consumption of vacancies by Co atoms and the pinning effect of Co atoms on dislocation. However, at 250°C, the stress relaxation resistance of the Cu-15Ni-8Sn-0.2P alloy was lower than that of the Cu-15Ni-8Sn alloy. This difference was due to the inclusion of P, which promoted the recrystallization reaction. Article highlights Recrystallization and the decrease of dislocation density are the major reasons for the stress relaxation of the samples. The stress relaxation resistance of Cu-15Ni-8Sn alloy was significantly improved with Co addition. The addition of the P element is not conducive to the improvement of thermal stress relaxation resistance.
Surface current engineering enabled broadband monopole patch antenna with low profile
Authors: Qu Bingyue , Pang Yongqiang , Wang Jiafu , Fu Xinmin , Shi Hongyu , Wang Luyi , Zhang Anxue , Xu Zhuo 
Published: March 2023

Abstract
Antennas with broadband radiation and small-size are highly required in wireless communication system. The trade-off relation between bandwidth and size became a difficulty when it comes to miniaturized antenna design. A method of realizing antenna miniaturization and bandwidth enhancement at the same time is needed. Monopole antennas are the most common used one in the devices of Internet of Things, Internet of Vehicles, and wireless access points et al. In this paper, a wideband low-profile top-loaded patch monopole antenna based on surface current engineering is proposed. The topology combines a center-fed circular patch with inductive vias. The patch is designed with patterns, which consists of four concentric annular rings and some strips in radial direction. In this way, three resonances are generated, and the pattern is optimized to bring three resonances close to each other. The number of the strips is specially designed to bring three resonances close to each other. By loading the inductive vias on the outermost rings, connecting to the ground, the resonance at low frequencies can be enhanced, as a consequence of the optimized impedance matching. The field distribution is analyzed to verify the operation principle. A prototype is fabricated, and the measured results agree well with the simulated ones. The relative −10 dB bandwidth is 69% and the omnidirectional radiation pattern is stable in the operating band. The antenna achieves a rather wideband radiation while maintaining a low profile. The method of antenna miniaturization and bandwidth enhancement based on surface current engineering paves the way for antenna design in low-profile ultra-wideband applications.
A compact LWIR borescope sensor for 2D engine component surface temperature measurement
Authors: Hsu Paul S , Chen Trevor , Roy Awnik , Zhang Andy , Oleksandr Bibik , Adhikari Subodh , Emerson Benjamin , Lieuwen Timothy 
Published: March 2023

Abstract
A compact long-wavelength infrared (LWIR) borescope imaging sensor operating in the wavelength range of 8–14 μm is designed and developed for non-contact two-dimensional (2D) surface temperature measurements in gas-turbine engines. The LWIR detection minimizes optical interferences from hot combustion gases and soot (emission within UV–mid IR region). Using simulations, the system is optimized for improving the signal collection efficiency and minimize image aberrations. The LWIR borescope probe is shielded by the custom-build compact water-cooled probe housing (outer diamter (OD) 19 mm, inner diameter (ID) 10 mm), which can sustain flame temperature up to 2400 K at a pressure of 50 bar. It facilitates long-term optical diagnostics inside the actual high-pressure combustion facilities where extreme thermal acoustic perturbation and intense heat fluxes are encountered. The design, construction, and characterization of the LWIR borescope sensor are discussed in detail. We present the 2D surface temperature measurements of a V-gutter bluff-body with simple nitrogen gas cooling in a laboratory testbed. The results indicate the sensor’s ability to accurately measure surface temperature with low background noise and to track transient cooling effect. The water-cooled probe housing was tested to verify the effectiveness of fast heat dissipation in high-temperature combustion environment to avoid unwanted thermal signals from the LWIR probe window. The developed LWIR sensor suite has promising applications in surface temperature measurements of engine components. The findings of this study may aid propulsion system engineers and researchers in designing thermal management systems and optimizing operation.
Enhanced electrocatalytic performance for oxygen evolution reaction via active interfaces of Co3O4 arrays@FeO
x
/Carbon cloth heterostructure by plasma-enhanced atomic layer deposition
Authors: Zhu Qingying , Yang Guoyong , Tang Limin , Mi Hongwei , Sun Lingna , Zhang Qianling , Deng Libo , Zhang Peixin , Ren Xiangzhong , Li Yongliang 
Published: March 2023

Abstract
Oxygen evolution reaction (OER) is a necessary procedure in various devices including water splitting and rechargeable metal-air batteries but required a higher potential to improve oxygen evolution efficiency due to its slow reaction kinetics. In order to solve this problem, a heterostructured electrocatalyst (Co3O4@FeO
x
/CC) is synthesized by deposition of iron oxides (FeO
x
) on carbon cloth (CC) via plasma-enhanced atomic layer deposition, then growth of the cobalt oxide (Co3O4) nanosheet arrays. The deposition cycle of FeO
x
on the CC strongly influences the in situ growth and distribution of Co3O4 nanosheets and electronic conductivity of the electrocatalyst. Owing to the high accessible and electroactive areas and improved electrical conductivity, the free-standing electrode of Co3O4@FeO
x
/CC with 100 deposition cycles of FeO
x
exhibits excellent electrocatalytic performance for OER with a low overpotential of 314.0 mV at 10 mA cm−2 and a small Tafel slope of 29.2 mV dec−1 in alkaline solution, which is much better than that of Co3O4/CC (448 mV), and even commercial RuO2 (380 mV). This design and optimization strategy shows a promising way to synthesize ideally designed catalytic architectures for application in energy storage and conversion.
p-n Homojunction perovskite solar cells: effects of ionic density and thickness of the doped layers
Authors: Ranpariya Spandan , Sinha Dhirendra Kumar 
Published: March 2023

Abstract
The p-n homojunction perovskite solar cells are promising in comparison to planar heterojunction perovskite solar cells. It is observed that the p-n homojunction provides an efficient built-in electric field for the photo-generated electron-hole pairs to dissociate into free charge-carriers and orient them to transport to the respective electrodes, thereby reducing the overall losses due to recombination processes. However, the existence of p-n homojunction, while in operation, is currently undergoing experimental tests. In this study, we simulated the current-voltage characteristics of both planar heterojunction and p-n homojunction perovskite solar cells. For simulation, we utilised a one-dimensional drift-diffusion equation. The current-voltage characteristics show a high fill factor for the p-n homojunction devices indicating better power conversion efficiency as compared to that of planar heterojunction devices. In addition, we report the spatial distribution of electron- and hole-density with variations in (i) the mobile ionic density, inherently present in the perovskite material and (ii) the thickness of p- and n-type perovskite layers. It is observed that the role of p-n homojunction ceases when the ionic density is higher than 1017 cm−3 or when one of the doped layers is substantially thicker as compared to the other. We correlate the cease of p-n homojunction to (i) the ionic effect which screens the built-in field, and (ii) the predominance of the effect of one doped layer over the other. The study provides impetus to the development of the p-n homojunction perovskite solar cells.
A' view of the sunrise: boosting helioscopes with angular information
Authors: Frerick Jonas , Kahlhoefer Felix , Schmidt-Hoberg Kai 
Published: March 2023

Abstract
The Sun may copiously produce hypothetical light particles such as axions or dark photons,
a scenario which can be experimentally probed with so-called helioscopes. Here we investigate the
impact of the angular and spectral distribution of solar dark photons on the sensitivity of such
instruments. For the first time we evaluate this spectral and angular dependence of the dark
photon flux over the whole mass range and apply this information to existing data from the Hinode
Solar X-Ray Telescope. Specifically we use calibration images for a classical helioscope analysis
as well as data from a solar eclipse providing sensitivity to exceptionally large oscillation
lengths. We demonstrate that exploiting the signal features can boost the constraints by more than
one order of magnitude in terms of the mixing parameter compared to a naive counting experiment.
State of the Art in Power Supply of Electrical Discharge Machining, Electrochemical Machining and their Variants
Authors: Zhao Ruming , Dong Hang , Zhou Jianping , Li Ruixiang , Chen Changke , You Pengfei 
Published: March 2023

Abstract
Power supply is the indispensable component for stable non-traditional machining based on electric power, such as electrical discharge machining (EDM), electrochemical machining (ECM), EDM-ECM combined machining, and EDM-ECM hybrid machining. The properties of power supply have significant effects on the machining performance, including efficiency, accuracy, and surface quality. This paper reviews the research progress and technical application in power supply of EDM, ECM, EDM-ECM combined machining, and EDM-ECM hybrid machining. The circuit principle, performance index, process effect of power supply are systematically analyzed. Moreover, the applications are summarized, and the future development are prospected.
Research and Realization of Hierarchical Information Interaction in Multi-load Regulation System
Authors: Zhang Liuliu , He Minyi , Xie Wei , He Zhen , Tan Zhijun 
Published: March 2023

Abstract
In the context of advancing the integration of power source network load storage and multi-energy complementary development, it is necessary to optimize the integration of power source, grid side, and load side resources to build a new power system with a high degree of integration of source network load and storage. The article analyzes the adjustable load distribution. In the scenario of multi-layer collaborative control, access methods are divided around load resource types and response characteristics, and an information interaction technology oriented to multiple load adjustments is proposed to achieve flexible and friendly interaction with various load aggregator systems. At present, research results have been obtained in the project. In practical applications, the flexible and friendly interaction of adjustable load resources enhances the flexible adjustment capability of the power grid and expands the space of adjustable load resources.
Jiles-Atherton Iron Core Hysteresis Model Parameter Identification with Enhanced Artificial Bee Colony Algorithm
Authors: Tang Hao , Chen Xuxuan , Yu Yuchen , Lei Yuanyuan 
Published: March 2023

Abstract
An enhanced artificial bee colony algorithm is proposed for the problems of insufficient accuracy and slow convergence of existing algorithms in J-A model parameter recognition, which introduces the Boltzmann selection strategy in the process of bee colony selection of nectar sources to dynamically adjust the convergence pressure of the algorithm. To enhance the overall optimization performance, at the same time, a global factor is added to the search formula to enhance the optimization capability of a single bee. Finally, a reverse learning strategy is used in the search process of the scout bee to enhance the quality of the solution in the later iteration to speed up the algorithm convergence. The identification and comparison experiments are carried out in combination with the simulation data and the measured data of silicon steel sheets. The results show that the identification results using the enhanced algorithm have better accuracy and faster convergence speed.
The Application of GaN/ZnO Heterojunction in Water Splitting
Authors: Liu Kai , Chen Zhizhong , Zhao Lixia , Su Kang , Xi Xin , Li Tuo , Wang Changhong 
Published: March 2023

Abstract
Different morphology of ZnO were deposited on GaN substrate using magnetron sputtering method by changing deposition conditions. The ZnO and GaN can form II-type heterojunction due to its higher conduction and lower valence band compared to GaN. The electric field generated by space charge region can separate the photo generated carriers more promptly. In the photocatalytic test, the best performance of GaN/ZnO photoanode with fine crystal quality is about 1.39 times compared to planar GaN. Our research paves a new way for the application of GaN in water splitting performance.
Thermal Calculation and Analysis of 9FA Type Gas Turbine Basic Conditions
Authors: Li Jiahu , Ma Chi , Wu Shaohua , Li Jiaxing 
Published: March 2023

Abstract
This paper takes GE’s PG9351FA gas turbine as the research object. From the perspective of energy conservation and mass balance, the compressor, the combustion chamber and the turbine are modeled separately, and then the models are coupled. Key parameters such as fuel, air and gas properties, unit fuel volume, cooling air volume, cooling air volume of the first stage vanes, equivalent turbine front temperature, and compressor efficiency are obtained through the model. The research results meet the engineering error requirements and have certain reference significance for the thermal design of gas turbines.
Transformer Fault Synthetic Diagnosis Method Based on Fusion of Multi-Neural Networks and Evidence Theory in Cloud Computing
Authors: Liu Rongsheng , Cui Shuguang , Lin Anping , Liao Yong 
Published: March 2023

Abstract
As the core equipment of power system, the failure of transformer will result in paralysis of the whole system. Therefore, timely diagnosis of transformer fault types is the most important task to ensure the stable operation of power system. Through the cloud computing method, the neural network is combined with the advantages of evidence theory, by comparing the chromatographic data of the transformer and the electrical test data. A comprehensive diagnosis method of transformer fault based on the fusion of multi neural network and evidence theory based on cloud computing is proposed. The fault diagnosis performance of the transformer is measured by the inspection of the fault transformer. The results show that compared with the traditional single data comparison, this method can improve the reliability and accuracy of diagnosis by comparing many kinds of data.
Design of Equipment Fault Diagnosis System Based on Audio Analysis Technology
Authors: Zhou Xinyu 
Published: March 2023

Abstract
In the aspect of state monitoring of hydropower unit, the main technical means is to collect and monitor the data on site by deploying various sensors and cameras in the unit and its affiliated units, relying on computer monitoring system and unit state monitoring system. However, it is difficult to intuitively feel the audio characteristics of the unit when it is running. Therefore, an equipment fault diagnosis system based on audio analysis technology is proposed, which makes use of audio analysis technology to analyze and process the on-site sound online, and provides a new auxiliary monitoring means for the equipment running status. Furthermore, the effectiveness of the system is verified by the operation of a power plant.
Heat Dissipation Performance Research of Power Lithium Battery Based on High Thermal Conductivity Graphite Film
Authors: Jin Biao , Fei Qiang , Lin Ruizhe , Zou Wuyuan 
Published: March 2023

Abstract
Heat will be generated inside the power lithium-ion battery during operation, if heat dissipation is not carried out in time, its temperature will rise continuously, causing thermal safety accidents once the temperature exceeds its normal work temperature range. In addition, the uniformity of the battery temperature will affect its performance, life, and even safety. Therefore, research on the heat dissipation performance of lithium battery can effectively improve its safety characteristics and working performance. To improve the temperature uniformity of single battery, different high thermal conductivity graphite films are used as the thermal conductivity enhanced scheme, the heat production and heat generation rate model of single battery was established, and its temperature simulation model was built by Ansys software to simulate heat dissipation performance. The results show that the high thermal conductivity graphite film can significantly enhance the battery heat dissipation performance, and its thickness, specific heat capacity and density have important effects on its performance.