bluuebunny/crossref_metadata_2025_split huggingface dataset:
Global Alfvénic modes excitation in ohmic tokamak plasmas following magnetic reconnection events
Authors: Kryzhanovskyy A. , Bonfiglio D. , Cappello S. , Veranda M. 
Published: January 2024

Abstract
A possible triggering mechanism of Alfvén waves (AWs) in tokamak plasmas, based on localized perturbations induced by magnetic reconnection events, is discussed in the framework of nonlinear viscoresistive 3D magnetohydrodynamics (MHD) modeling. Numerical simulations are performed with the SpeCyl code (Cappello and Biskamp 1996 Nucl. Fusion 36 571) that solves the equations of the viscoresistive MHD model in cylindrical geometry. We investigate a ohmic tokamak configuration where the m = 1, n = 1 internal kink mode (m is the poloidal mode number and n is the toroidal mode number) undergoes a complete reconnection process. An in-depth investigation of the process shows a spatio-temporal correlation between the velocity perturbations associated with the reconnection and the excitation of the shear AW in the core region and the global Alfvén eigenmodes, both with dominant m = 1, n = 0 periodicity. In particular they are observed to emanate from the outflow cones of the reconnection layer associated with the internal kink. The excitation mechanism described in this paper could explain the observations of Alfvénic fluctuations in the absence of energetic ions in several tokamak experiments documented in the literature and could contribute to AWs excitation in general, even in the presence of fast particles. This result shares similarities with analogous study in reversed-field pinch (RFP) configuration (Kryzhanovskyy et al 2022 Nucl. Fusion 62 086019) where AWs were found to be excited by the RFP sawtoothing.
Design optimization method of heating and cooling full cycle storage air conditioning in integrated energy system
Authors: Biao Qiao , Li Jintang , Tan Zhukui , Wang Yang , Li Ji , Liang Shukui , Qin Yipeng 
Published: January 2024

Abstract
Heating and cooling storage air conditioning is an important part of the integrated energy system, which can play an important role in the flexible conversion of thermoelectric coupling systems. Because storage air conditioning involves the dynamic characteristics of power supply on the source side and cold and heat demand on the load side, system capacity allocation is a problem of technical and economic optimization. This paper breaks through the traditional design method based on the hourly load distribution law of typical design days and proposes a performance-oriented design method for the bidirectional full-cycle dimension storage air conditioning system based on the system’s annual operation performance, which can take into account the hourly dynamic load distribution law of every day in the full heating season and the full cooling season coupled with the bidirectional demand of cold and heat loads. A more scientific and reasonable capacity configuration scheme for the storage air conditioning system is obtained. The design is presented with a concrete case.
Numerical simulation of convective heat transfer in the discharging process of external ice-melting ice storage systems
Authors: Song Kaiwen , Liu Zedong 
Published: January 2024

Abstract
The external ice-melting ice storage system was widely used because of its advantages of reducing peak power consumption, reducing energy consumption and emissions, and fast ice melting speed. However, designing the external ice-melting ice storage system proved to be a challenge, and the structure and flow of the water distribution system needed to be fully considered. In particular, the problem of unstable outlet water temperature limited the practical application of the external melting ice storage system. Aiming at the problem of unstable outlet water temperature, a three-dimensional CFD phase change model was constructed in this paper. By comparing with the experimental data, the impact of varying water flow rates on the thermal and cooling properties of the was investigated. The results indicated that when the water flow rate was 226 ml/min for the system with an ice thickness of 74 mm, the outlet temperature of the ice storage tank was consistently below 5°C, the Nusselt number of ice and water remained constant, and the convective heat transfer effect was improved. The numerical simulation results provided guidance for the design and practical application of the water distribution system of the external melting ice storage system.
Influence of parameters in two-phase spray heat dissipation of electronic components
Authors: Fu Hao , Zheng Lei , Chen Hua , Cheng Wen-long 
Published: January 2024

Abstract
The two-phase spray cooling system has the characteristics of high cooling medium utilization, strong cooling capacity, and less space, which can meet the increasing heat dissipation demand of electronic components. This paper established a two-phase spray heat transfer system with electron-fluorinated liquid perfluoro-4-methyl-2-pentene (FCM-47) as the experimental liquid. The influence of spray distance, nozzle flow characteristic coefficient, and atomization pressure difference on the spray characteristic and the heat dissipation performance of spray cooling in the boiling zone were studied. The experiment shows that the critical state will occur in advance when the spray distance is reduced to a certain height (3 mm). An optimal spray distance of 8 mm corresponds to the lowest surface temperature and maximum CHF (critical heat flux). Increasing the nozzle flow characteristic coefficient and spray pressure difference can improve the heat exchange by increasing flow. However, increasing the nozzle flow characteristic coefficient can increase CHF but has little effect on the critical temperature, and increasing the spray pressure difference can increase both the critical temperature and CHF. This is related to their effect on atomization characteristics.
Experimental study on the flow and heat transfer characteristics of pin-fin manifold microchannel heat sink
Authors: Pan Yuhui , Chen Hua , Shen Yitao , Cheng Wenlong 
Published: January 2024

Abstract
A manifold microchannel radiator with a cylindrical pin-rib microchannel is designed and fabricated to enhance the heat dissipation capability of the manifold microchannel radiator, and its flow and heat dissipation capability are investigated by experiments. The fabrication and experiment of the manifold pin-rib microchannel radiators are introduced in detail. The heat dissipation capability of manifold pin-rib microchannel radiators at different flow rates is compared. The result shows that the manifold pin-rib microchannel radiator has excellent heat dissipation performance. When HFE7100 is used as the working medium, the average heated surface temperature of the manifold pin-rib microchannel radiator is about 100°C at the thermal flux density of 1000 W/cm2.
Research on configuration strategies for reducing low-voltage line losses through distributed photovoltaics
Authors: Guo Xirong 
Published: January 2024

Abstract
Photovoltaic power generation is currently one of the primary ways to harness solar energy in the world. In the face of the severe fossil fuel and environmental crises that the world is currently confronting, photovoltaic power generation has clear advantages from both the perspectives of resource sustainability and environmental friendliness. This paper explores the configuration strategy for addressing power losses in voltage elevation and distribution by studying methods of distributed photovoltaic power generation that focus on local generation, local grid connection, local conversion, and local utilization. Finally, the effectiveness of the configuration strategy is demonstrated through case analysis.
Heat transfer and flow characteristics of cuo-al2o3 hybrid nanofluids in slotted finned channels
Authors: Wu Shihao , Xu Genghao , Lin Haosen , Xiao Wensheng , Ma Lei 
Published: January 2024

Abstract
This study aimed to investigate the heat transfer coefficient of CuO-Al2O3 hybrid nanofluids within a microchannel heatsink, focusing on the impact of flow rate and volume fraction. The thermal conductivity and viscosity of hybrid nanofluids with different particle ratios were investigated. The results showed that the nanofluids have a more remarkable enhancement in thermal conductivity than water. Employing the hybrid nanofluids enhanced the heat transfer coefficient significantly. Furthermore, a slight growth in the friction factor was observed.
Integrated modeling method of the internal and external flow of helicopter/inlet
Authors: Su Zhimin , Cheng Benlin , Huang Xing , Cui Jiahang , Cai Feichao 
Published: January 2024

Abstract
The internal and external integrated flow field modeling method of the helicopter/inlet system was studied. The boundary of internal flow field modeling was proposed. The internal and external integrated calculation model, including the helicopter fuselage, rotor, tail rotor, and other rotating components, as well as the internal flow field of the inlet, was established. On this basis, numerical calculation is carried out according to typical working conditions to analyze the flow field characteristics in the forward flight state and the influence of inlet back pressure on performance parameters. The results show that the integrated numerical calculation model established in this paper considers the internal and external interference of the actual rotor movement in the outflow field. The integrated flow field calculation in typical working conditions shows that the occlusion of the rotor blade and the fuselage will cause interference with the inlet flow field. The parameters of the left and right inlet ports will be different. With the decrease of inlet back pressure, the total pressure recovery decreases with the increase of flow rate and is obviously lower than that without rotor interference.
Instability of viscous annular liquid film jet under high air-to-fluid velocity rate
Authors: Shi Haozhe 
Published: January 2024

Abstract
Based on the surface wave dispersion relation equation of viscous annular liquid film jet established by the research group in the early stage, a dispersion relation equation calculation program is written according to Mathematica. A linear stability analysis is carried out for the high air-fluid velocity ratio viscous annular liquid film jet entering a compressible gas medium environment. The relationship between the surface wave growth rate of an annular liquid film jet and the surface wave number under different characteristic parameters is obtained. The connection based on the dominant wave’s growth rate or the dominant wave’s number with dimensionless parameters such as air-fluid velocity rate, air-fluid density rate, Weber number of liquid, liquid Reynolds number, and gas Mach number was analyzed. The consequences reveal that under the high air-fluid velocity ratio, the increase of the above dimensionless parameters promotes the fragmentation course of the annular liquid film jet. Moreover, the augment of the air-fluid velocity rate has the greatest influence on the stability of the viscous annular liquid film jet. In contrast, the Reynolds number of the liquid has less influence than the reliability of the annular liquid film jet. Linear stability analysis under this condition lays the foundation for the prediction model of the most unstable parameters of annular liquid film jet in practical engineering applications.
Track reconstruction for the COMET Phase-II experiment with ACTS
Authors: Razquin Amaia , Lee MyeongJae 
Published: January 2024

Abstract
An implementation of A Common Tracking Software (ACTS) toolkit for signal electron
reconstruction for the COMET muon to electron conversion experiment is discussed. The
COMET experiment in J-PARC, Japan, will search for neutrinoless conversion of muons into electrons
in the field of an aluminium nucleus, a lepton flavour violating process, aiming target
sensitivity of 10-17. To achieve its scientific goals, the experiment requires a
reconstructed momentum resolution of lower than 150 keV/c. For the first time by applying ACTS to
signal events in the 100 MeV energy range with multiple-turn trajectories in the presence of
background events, it is found that the reconstruction efficiency is around 14% with no fake
reconstructed events. The implementation details, performance, and issues of ACTS in the context
of COMET are presented.
Electronic properties of ZrO2 films fabricated via atomic layer deposition on 4H-SiC and Si substrates
Authors: Wang Xi-Rui , Zeng Yu-Xuan , Zhang Jie , Huang Wei , Ma Hong-Ping , Zhang Qing-Chun 
Published: January 2024

Abstract
Being an important semiconductor material for high power applications, silicon carbide (SiC) faces the problems while used as a gate oxygen layer in traditional Si MOS devices. In view of this, an innovative approach was adopted in the present work to replace the conventional SiO2 with a high-k material (ZrO2) as the gate oxygen layer to investigate its effect on the electrical characteristics of the devices. In particular ZrO2 films were deposited on Si and SiC substrates by atomic layer deposition (ALD), and Al was used as the electrode. The atomic force microscopy (AFM) microregion scan revealed a highly flat surface with Rq < 1 nm after the ALD growth of ZrO2 layer. The sample surface analysis via x-ray photoelectron spectroscopy (XPS) suggested the presence of a small amount of ZrOx components. According to the electron energy loss spectrum (EELS), the band gap width (Eg) of this ALD ZrO2 dielectric was 5.45 eV, which met the requirements for high-quality 4H-SiC-related MOS devices. The electrical properties of the samples were then studied, and the maximum breakdown voltage of the Al/ZrO2/SiC/Al MOS structure was obtained to be 23 V, i.e., nearly twice that of the Si substrate. As for the oxide layer, the interface defect density (Dit) near the conduction band of the Al/ZrO2/SiC/Al MOS structure was only 1012 eV−1 cm−2 orders of magnitude. The Neff value (the movable charge) of the structure was also controlled at 1012 cm−2. Therefore, the overall performance of the ZrO2/SiC structure in terms of electrical properties exceeded that of the ZrO2/Si structure and previously reported counterparts. In this respect, the ZrO2/SiC MOS capacitor structure has great research potential.
Experimental study of the effect of the concentration of water/polyalkylene glycol solutions on heat transfer in steels subjected to quenching
Authors: Buenrostro Brandon Farrera , Bocanegra Constantin Alberto Hernández , Banderas José Angel Ramos , Valdovinos Luis Enrique Molina , Granados Nancy Margarita López , Vapalahti Sami 
Published: January 2024

Abstract
In this work, the heat transfer coefficients were determined utilizing an experimental study for cooling a 15B35H boron steel, using aqueous solutions of polyalkylene glycol (PAG) as a cooling fluid. A cooling tank was designed and built to allow the fluid recirculation, where the effect of agitation and the PAG content in a concentration range of 2%–6% vol. were analyzed. The thermal histories of cylindrical probes instrumented with K-type thermocouples were obtained, and the heat transfer coefficients associated with the types of refrigeration were calculated, solving the IHCP. The results show the presence of two maximum surface heat flux denominated q1max for the low-temperature range and q2max for the high-temperature range. Getting higher q1max and low q2max is desirable to avoid distortion and cracking. It was found that 4% PAG exhibits a slight variation of heat flux values in both low and high-temperature regions, regardless of the degree of agitation, maintaining values of about 3 MW·m−2 for q1max and 5.5 MW·m−2 for q2max. In this case, q2max is higher than q1max, leading to higher cooling rates in the martensitic transformation zone, increasing the risk of distortion and cracking. In the cases of 2 y 6% PAG, agitation affects q1max ranging from 2.5 to 6 MW·m−2, and for q2max from 4 to 6 MW·m−2, where q1max is always higher than q2max, providing better conditions for quenching.
A compatibility study of protective coatings for temperature sensor integration into sodium-ion battery cells
Authors: Vincent Timothy A , Maddar Faduma M , Chao Sheng , Guk Erdogan , Sansom Jonathan E H , Gulsoy Begum , Copley Mark , Hasa Ivana , Marco James 
Published: January 2024

Abstract
Instrumented battery cells (i.e. those containing sensors) and smart cells (with integrated control and communication circuitry) are essential for the development of the next-generation battery technologies, such as Sodium-ion Batteries (SIBs). The mapping and monitoring of parameters, for example the quantification of temperature gradients, helps improve cell designs and optimise management systems. Integrated sensors must be protected against the harsh cell electrolytic environment. State-of-the-art coatings include the use of Parylene polymer (our reference case).
We applied three new types of coatings (acrylic, polyurethane and epoxy based) to thermistor arrays mounted on flexible printed circuit board (PCBs). We systematically analyse the coatings: (i) PCB submersion within electrolyte vials (8 weeks); (ii) analysis of sample inserted into coin cell; (iii) analysis of sensor and cell performance data for 1Ah pouch SIBs. Sodium-based liquid electrolyte was selected, consisting of a 1 M solution of sodium hexafluorophosphate (NaPF6) dissolved in a mixture of ethylene carbonate and diethylene carbonate in a ratio of 3:7 (v/v%). Our novel experiments revealed that the epoxy based coated sensors offered reliable temperature measurements; superior performance observed compared to the Parylene sensors (erroneous results from one sample were reported, under 5 d submersed in electrolyte).
Nuclear magnetic resonance (NMR) spectroscopy revealed in the case of most coatings tested, formation of additional species occurred during exposure to the different coatings applied to the PCBs. The epoxy-based coating demonstrated resilience to the electrolytic-environment, as well as minimal effect on cell performance (capacity degradation compared to unmodified-reference, within 2% for the coin cell, and within 3.4% for pouch cell). The unique methodology detailed in this work allows sensor coatings to be trialled in a realistic and repeatable cell environment. This study demonstrated for the first time that this epoxy-based coating enables scalable, affordable, and resilient sensors to be integrated towards next-generation Smart SIBs.
Study on the mechanism of oxygen atom-related non-covalent interactions on the structure of non-fused ring acceptor molecules and their optoelectronic properties
Authors: Wang Miao , Wang Lei , Gao Huanhuan , Li Jin , Liu Zhao , Song Haiyang 
Published: January 2024

Abstract
Non-covalent interactions play a crucial role in regulating the molecular conformation and optoelectronic properties of the acceptor. In this paper, hydroxyl groups of different positions and numbers are inserted on the original non-fused ring acceptor molecule W0. Thus, eight novel molecules were designed. Density functional theory (DFT) and time-dependent DFT (TD-DFT) are used to investigate the mechanisms of non-covalent interactions between S…O on the molecular conformation, electronic structure and its optoelectronic properties. The existence of intramolecular S…O non-covalent interactions was demonstrated by the Atoms-In-Molecules topological analysis and RDG isosurface visualization. The study of the molecular conformational planarity revealed that the introduction of unilateral groups can optimize the homolateral planarity. As the number of hydroxyl insertions increases, the twisting of the two thiophene units within the central core intensifies. This also leads to an impact on the internal planarity of the central core. The electrostatic potential (ESP) analysis showed that the asymmetric hydroxyl modification increased the dipole moment and may be more beneficial for electron transfer. The larger the dipole moment, the more negative the ESP. Theoretical results show that the introduction of hydroxyl groups is significantly superior in terms of light absorption, dipole moment and exciton binding energy as well as excitation energy. As the number of hydroxyl groups increases, they show more potential in increasing the excitation energy and light absorption and decreasing the exciton binding energy. This study provides new insights into the design and development of high-performance non-fused ring acceptors.
Recent advances in fabrication and functions of neuromorphic system based on organic field effect transistor
Authors: Liu Yaqian , Lian Minrui , Chen Wei , Chen Huipeng 
Published: January 2024

Abstract
The development of various artificial electronics and machines would explosively increase the amount of information and data, which need to be processed via in-situ remediation. Bioinspired synapse devices can store and process signals in a parallel way, thus improving fault tolerance and decreasing the power consumption of artificial systems. The organic field effect transistor (OFET) is a promising component for bioinspired neuromorphic systems because it is suitable for large-scale integrated circuits and flexible devices. In this review, the organic semiconductor materials, structures and fabrication, and different artificial sensory perception systems functions based on neuromorphic OFET devices are summarized. Subsequently, a summary and challenges of neuromorphic OFET devices are provided. This review presents a detailed introduction to the recent progress of neuromorphic OFET devices from semiconductor materials to perception systems, which would serve as a reference for the development of neuromorphic systems in future bioinspired electronics.
All fiber single frequency pulsed Yb doped laser source scaling up to 600 uJ at 1 kHz
Authors: Yang Y J , Wu T F , Li C Y , Xia C Q , Li K T , Li Q S , Zhang Z Q , Han S 
Published: January 2024

Abstract
An all-fiber based high energy single frequency pulsed laser at 1030 nm with fixed repetition rate of 1 kHz was demonstrated. The system adopts a master oscillator power amplifier configuration. In the main amplification stage, we employed a highly doped, very large core diameter of 50 μm YDF fiber as the laser gain media. 670 μJ, 500 ns pulse train was obtained, corresponding to a peak power of 1.34 kW. Such a high-peak-power and high-repetition-rate SF source is well suited for long range coherent imaging, optical remote sensing, and coherent interferometry, etc.