bluuebunny/crossref_metadata_2025_split huggingface dataset:
Non-contact fault detection of overhead insulators in distribution networks based on sound and light collaboration
Authors: Luo Busheng , Yang Wenfang , Zhong Zhenxin 
Published: November 2024

Abstract
Due to the low detection accuracy of traditional non-contact fault detection methods for overhead insulators in distribution networks, a non-contact fault detection method is proposed for overhead insulators in distribution networks based on sound and light collaboration. This method first uses an acoustic and optical signal acquisition device to capture insulators’ acoustic and optical signals during operation, and preprocesses the collected data to remove noise and improve signal clarity. Next, key fault features are extracted from these signals, such as the analysis of the acoustic frequency spectrum and the identification of spectral features, which help distinguish insulators’ normal working and fault states. Finally, the extracted features are classified using the support vector machine algorithm to achieve non-contact fault detection of overhead insulators in the distribution network. The experimental results show that this method can accurately and quickly detect the faults of overhead insulators in the distribution network, with high detection accuracy and practicality, providing strong technical support for the safe operation of the distribution network.
Study on the transient overvoltage suppression effect of the synchronous condenser of high percentage renewable energy in the sending-end system
Authors: Guo Qi , Li Dandan , Zhao Yue 
Published: November 2024

Abstract
This paper analyzes the impact of configuring a synchronous condenser on the characteristics of the Inner Mongolia power grid following the commissioning of the first grid-to-grid DC project. Simulation results show that, after the configuration of synchronous condenser, the multiple renewable energy stations short circuit ratio (MRSCR) rises, and the DC sending end of the grid is a strong system, which is conducive to the whole scale of renewable energy transmission of Inner Mongolia power grid. DC bipolar blocking faults and transient overvoltage problems at the sending end occur for different operating conditions, such as reduced power and bipolar operation. Then, the effect of different numbers of synchronous condensers on transient overvoltages is studied. The study shows that it is necessary to reasonably arrange the DC project supporting thermal power unit start-up mode and configure large-capacity synchronous condenser or a certain number of distributed regulators, which can help to alleviate the problem of transient overvoltage during faults.
Innovative heat sink design for enhanced cooling efficiency in Dual Active Bridge (DAB) topology
Authors: Liu Chenghong , Xu Zhuowei , Han Donghao , Ma Jian 
Published: November 2024

Abstract
After in-depth research and analysis, aiming at the heat generation mechanism and limitations of the current heat dissipation method, this paper proposes an innovative heat dissipation design scheme. By optimizing the structural design of the heat sink, the heat dissipation surface area is increased, thus achieving more efficient heat emission and maintaining the optimal operating temperature of the equipment. Experimental data show that this new heat dissipation design significantly improves the cooling efficiency, an increase of about 60%, and provides support for the performance improvement of high-power power products, which brings a reliable and efficient cooling solution for related industries.
Realization of building grade fire resistance in independent fire zone of energy storage system
Authors: Chen Man , Zhao Juran , Peng Peng , Wan Minhui , Wang Wenjie , Cao Hu , Tan Qipeng , Cong Haibo 
Published: November 2024

Abstract
Lithium battery energy storage technology is one of the most promising technologies in the field of energy storage. The fire prevention and control of energy storage system usually needs to consider the cooperation of various parts of the energy storage system. The domestic standard requirements for the fire resistance of energy storage system have not been completely established. In this paper, combined with the US standard and related fire resistance experimental standards, the relevant requirements and test methods for the fire insulation performance of battery cabinet of the energy storage system are studied, and a set of structural design methods and test schemes for the 2h fire resistance limit of the energy storage system are formed. The research shows that the fire insulation of the battery cabin has positive significance for reducing the energy consumption of the air conditioning of the energy storage product, improving the battery life, and enhancing the safety performance of the energy storage system. It is of great significance to study the suitable fire resistance limit of energy storage products for improving the land utilization rate of energy storage system and saving the construction cost.
A study of automatic output power control methods for stand-alone photovoltaic power generation systems
Authors: Xiao Guannan 
Published: November 2024

Abstract
The conventional power generation system’s output power automatic control structure is generally unidirectional, and the control coverage is small, leading to the increase in the random error obtained in the final test. Therefore, the design and research of this article are proposed. According to the current control demand, the generation system shall be stabilized first, and the power compensation shall be calculated. The multi-step mode shall be adopted to improve the control coverage and design the multi-step automatic control structure. According to this, it is constructed, and the automatic control processing is realized using jump balance. The test results show that compared with the traditional DFIG-DRWT system power output automatic control method and the traditional three-phase asynchronous generation system power output automatic control method, the random error finally obtained by the designed independent photovoltaic power station output power automatic control method is relatively effective. This indicates that the application effect and coverage of the designed power automatic control method are high, that controllability has been significantly improved, and that control flexibility has also been strengthened.
Optimization of marine hybrid power energy consumption
Authors: Song Yanlin , Zeng Xiangming 
Published: November 2024

Abstract
The energy and power system of the ship is the core of the ship, and the composite energy storage plays a great role in reducing the load power fluctuation of the ship, which effectively optimizes the energy efficiency index and reliability of the ship. [Objective] To better optimize the ship energy management system, a control model is established according to the characteristics of the energy system of hybrid electric ships. [Method] Energy consumption optimization is carried out by using a rule-based energy control strategy and energy control strategy based on equivalent fuel consumption minimum (ECMS). The dynamic control and strategy of the hybrid ship were optimized, and the data simulation and real ship application were carried out on the hybrid experiment platform. [Results] According to the data and results of the real ship application, the following results were shown: The daily fuel saving rate of the ECMS strategy is 14.6% in normal operating conditions and 13.3% in cruise operating conditions. [Conclusion] It has a great effect on the improvement of ship energy efficiency.
The study of active support for energy storage system in system frequency regulation
Authors: Zhou Wenchao , Liu Bing 
Published: November 2024

Abstract
As the penetration of new energy sources increases, the proportion of traditional energy units continues to decline, reducing the inertia and primary frequency regulation capability of the power system. Therefore, exploring the frequency support capabilities of energy storage systems with low inertia is crucial. Based on this, this paper first proposes an active frequency support method for energy storage system based on a Voltage Source Virtual Synchronous Generator (VSG), aiming to enhance system inertia and reduce response delay. Based on this issue, a parameter tuning optimization selection model based on the Transient Search Optimization (TSO) algorithm is proposed to determine the optimal power output and best frequency regulation parameters for the energy storage system. Finally, the model proposed in this paper is applied to the IEEE 14-bus system to verify its effectiveness.
Spectral bounds on the entropy flow rate and Lyapunov exponents in differentiable dynamical systems
Authors: Das Swetamber , Green Jason R 
Published: November 2024

Abstract
Some microscopic dynamics are also macroscopically irreversible, dissipating energy and producing entropy. For many-particle systems interacting with deterministic thermostats, the rate of thermodynamic entropy dissipated to the environment is the average rate at which phase space contracts. Here, we use this identity and the properties of a classical density matrix to derive upper and lower bounds on the entropy flow rate from the spectral properties of the local stability matrix. These bounds are an extension of more fundamental bounds on the Lyapunov exponents and phase space contraction rate of continuous-time dynamical systems. They are maximal and minimal rates of entropy production, heat transfer, and transport coefficients set by the underlying dynamics of the system and deterministic thermostat. Because these limits on the macroscopic dissipation derive from the density matrix and the local stability matrix, they are numerically computable from the molecular dynamics. As an illustration, we show that these bounds are on the electrical conductivity for a system of charged particles subject to an electric field.
Halitosis in oral lichen planus patients
Authors: Guan Guangzhao , Tjhang Vicky , Sun Sally , Polonowita Ajith , Mei Li 
Published: November 2024

Abstract
To investigate the halitosis level in oral lichen planus (OLP) patients and OLP-free participants. This cross-sectional study recruited 70 participants at the New Zealand’s National Centre for Dentistry. Halitosis was determined using the objective measurements (parts per billion (ppb) volatile sulphur compounds (VSCs) in the exhaled air) and subjective measurement (self-reported halitosis questionnaire). The VSCs values of OLP participants (mean ± SD: 144.64 ± 23.85 ppb) were significantly greater than that in the OLP-free participants (105.52 ± 22.31ppb) (mean difference: 39.12 ppb; p < 0.05; 95% CI: 27.95, 50.29). The VSCs value of hyperplastic (mean difference: 34.11; 95% CI: 20.07, 48.15; p < 0.05) and erosive/ulcerative (mean difference: 57.47; 95% CI: 34.19, 80.76; p < 0.05) OLP participants were statistically greater than that of OLP-free participants. No statistical significance was found between hyperplastic and erosive/ulcerative OLP (p > 0.05). ‘Type (OLP-free/OLP)’ has a significant effect on the dependent variable VSCs. 78.6% of OLP and 90.5% of OLP-free brushed their teeth at least twice daily, with a statistically significant observation (Mean square: 1.61; F: 13.13; p < 0.05). The levels of VSCs were greater in participants with hyperplastic and erosive/ulcerative OLP than that in the OLP-free participants.
Effect of bionic shield texture on friction behavior of silicon carbide under water lubrication condition
Authors: Qiao Yan , Long Wei , Wang Pengyang , Li Bin , Yin Yuting , Gui Puteng , Zhang Yusen 
Published: November 2024

Abstract
Reasonable texture parameters can effectively generate local dynamic pressure effects and promote the formation of lubrication film. The synergistic friction reduction mechanism of the shield-shaped texture on the Silicon Carbide (SiC) surface under water-based lubrication conditions between the flow pressure effect and the ‘rolling ball’ effect is investigated by combining simulation analysis and friction experiments. The effects of shield textured surface on the friction and wear characteristics of SiC surface and the characteristics of interfacial polarization electric field under different rotational speeds and different load conditions were analyzed. The results display that synergistic texture lubrication has a beneficial effect on improving tribological properties. The surface with 6% texture area occupancy showed the best tribological characteristics. The surface with a textured area occupancy of 6% displays the optimal tribological properties. Moreover, the friction reduction mechanisms under different working conditions are discussed, with the textured uniformly arranged surfaces being more suitable for high-speed and heavy load (140 N, 2000 rpm) conditions and the textured non-uniformly arranged surfaces being more suitable for low-speed and light load (40 N, 400 rpm) conditions.
Quantitative characterization and mapping relationship between microstructure, composition, orientation, and mechanical properties of nickel-based superalloy Inconel 718
Authors: Ma Yaxin , Gao Yifei , Zhao Lei , Liu Zhanbin , Yang Lixia , Wang Haizhou 
Published: November 2024

Abstract
This study explores the relationship between the microstructure, composition, orientation, and mechanical properties of the nickel-based superalloy Inconel 718. Employing scanning electron microscopy (SEM), electron microprobe (EMP), nano-indentation, and other techniques, the study observes the structure, confirms the composition, determines orientation, and tests mechanical properties in specific micro-zones. Findings reveal a uniform grain distribution in Inconel 718, with a minor δ-phase presence at grain boundaries. There is a notable enrichment of Nb at the grain boundaries, whereas Fe and Cr levels are lower at these boundaries compared to the grain interiors. The indentation hardness and modulus at the grain boundaries are markedly higher than those within the grains. Moreover, grains with different orientations exhibit diverse microscale mechanical properties, such as hardness and elastic modulus. This research establishes a quantitative characterization and mapping relationship between the microstructure, composition, orientation, and mechanical properties of Inconel 718, providing a foundation for future multiscale (micro to macro) mechanical property investigations.
Discharge fault detection of dry air switchgear based on ZnO-MoS2 gas sensor
Authors: Li Peng , Yuan Ye , Zhou Rong , Li Lin , Cui Hao , Pu Ziheng , Yang Xuelin 
Published: November 2024

Abstract
When discharge faults occur in dry air switchgear, the air decomposes to produce diverse gases, with NO2 reaching the highest levels. Detecting the NO2 level can reflect the operation status of the equipment. This paper proposes to combine ZnO cluster with MoS2 to improve the gas-sensitive properties of the monolayer. Based on the Density Functional Theory (DFT), the effect of (ZnO)n size on the behavior of MoS2 is considered. Key parameters such as adsorption energy and band gap of (ZnO)n-MoS2/NO2 system were calculated. The ZnO-MoS2 heterojunction was successfully synthesized by a hydrothermal method. The gas sensor exhibits a remarkable response and a fast response-recovery time to 100 ppm NO2. In addition, it demonstrates excellent selectivity, long-term stability and a low detection limit. This work confirms the potential of the ZnO-MoS2 composite structure as a highly effective gas sensor for NO2 detection, which provides valuable theoretical and experimental insights for fault detection in dry air switchgear.
Performance and scaling analysis of variational quantum simulation
Authors: Ponce Mario , Cope Thomas , de Vega Inés , Leib Martin 
Published: November 2024

Abstract
We present an empirical analysis of the scaling of the minimal quantum circuit depth required for a variational quantum simulation (VQS) method to obtain a solution to the time evolution of a quantum system within a predefined error tolerance. In a comparison against a non-variational method based on Trotterized time evolution, we observe similar scaling behaviours of the depth requirements of VQS and Trotter when the size of the system and the simulated time grow linearly. Results are also put into perspective by discussing the corresponding classical complexity required for VQS. Our results allow us to identify a possible advantage region for VQS over Trotterization.
Exploring phyto- and zooplankton community structure, spatial variation, and driving forces shaping the community from a large-scale freshwater dominated estuary
Authors: Shahadat Hossain Md , Ullah M Akram , Sultana Salma , Hasan Md Monjurul , Pramanik Md Mehedi Hasan , Hasan Md Robiul , Paray Bilal Ahamad , Arai Takaomi , Hossain Mohammad Belal 
Published: November 2024

Abstract
Plankton is essential to estuarine food webs, providing key food for species like fish larvae, and understanding their dynamics helps us comprehend ecological interactions and energy transfer in aquatic ecosystems. This study examined the plankton community structure, diversity, variability and the environmental variables of water that influenced these communities in a freshwater-dominated estuary along the Northern Bay of Bengal during the dry season. A variety of tools were employed, including a dissecting microscope, a Sedgwick-Rafter cell, and a Hanna multi-parameter meter, to obtain detailed and comprehensive data. From the analyses, in total 37 genera of phytoplankton belonging to 11 classes such as Bacillariophyceae (66%), Coscinodiscophyceae (28%), Fragilariophyceae (1%), Euglenophyceae (1%), Cyanophyceae (1%), others (3%) were recorded. Zooplankton, consisting of multicellular organisms, was represented by 11 genera across five classes, with Monogononta (53%) and Insecta (29%) being the most prevalent. Phytoplankton exhibited a mean abundance of 180,000 ± 20,200 cells l−1 whereas zooplankton showed a mean abundance of 3,000 ± 200 cells l−1. The diversity indices (H′), evenness (J′) and dominance (D) ranged from 1.188 ± 0.015 to 0.19 ± 0.006, 0.9377 ± 0.002 to 0.5118 ± 0.006, 0.365 ± 0.001 to 0.143 ± 0.002 respectively, suggested low to moderate plankton diversity with a suppressed community and moderate to high dominance in the river water. Based on the similarity percentage (SIMPER) and analysis of similarity (ANOSIM), Phytoplankton and zooplankton varied significantly between stations while non-metric multi-dimensional scaling (nMDS) indicated greater consistency in phytoplankton communities across stations compared to zooplankton. Furthermore, Pearson’s correlation coefficient (rs) and canonical correspondence analysis (CCA) identified transparency, sulfates, dissolved oxygen, conductivity, TDS, pH, and salinity as major influencers of plankton abundance; nitrate had a moderate effect. Spearman’s rank correlations showed significant positive (p < 0.05) correlations between diversity indices and environmental variables. Future research should focus on long-term monitoring and the potential impacts of environmental changes on plankton communities.
Towards highly efficient thin-film solar cells with a graded-bandgap CZ TSSe layer. Part II: Piecewise-homogeneous bandgap grading
Authors: Ahmad Faiz , Monk Peter B , Lakhtakia Akhlesh 
Published: November 2024

Abstract
In Part I, we optoelectronically optimized a thin-film solar cell with a graded-bandgap CZTSSe photon-absorbing layer and a periodically corrugated backreflector, using the hybridizable discontinuous Galerkin (HDG) scheme to solve the drift-diffusion equations. The efficiency increase due to periodic corrugation was minimal, but significant improvement was achieved with a nonlinearly graded bandgap. Due to occasional failures of the HDG scheme from negative carrier densities, we developed a new computational scheme using the finite-difference method, which also reduced the overall computational cost of optimization. Later, a normalization error was discovered in the electrical submodel in Part I, but it did not alter the overall conclusions. We have now re-optimized the solar cells with (i) a homogeneous bandgap, (ii) a linearly graded bandgap, or (iii) a nonlinearly graded bandgap, and (iv) a piecewise-homogeneous bandgap which is easier to implement than a continuously graded bandgap. An efficiency of 13.53% is predicted with a three-layered piecewise-homogeneous CZTSSe layer. Furthermore, concentrating sunlight by a factor of one hundred can boost the efficiency to 16.70% with the piecewise-homogeneous bandgap.
Informatics-based design of polyaniline-carbon nanotube thermoelectric nanocomposite using ANN and GA
Authors: Ebrahimibagha Dariush , Ray Mallar , Datta Shubhabrata 
Published: November 2024

Abstract
Conducting polymer and carbon nanotube (CNT) based nanocomposites have emerged as prospective thermoelectric (TE) materials due to their potential application in flexible electronics. Non-conventional charge and heat transport in these nanocomposites, presents the possibility to enhance the TE conversion efficiency, given by

Z
T

. However, the highly non-linear and complex association of structure and composition with the overall TE properties have hindered the development of any general strategy to develop high

Z
T

nanocomposites. Here, we implement artificial neural network and genetic algorithm to develop data driven models followed by optimization to design high efficiency nanocomposites based on CNT dispersed in polyaniline (PANI) matrix. Our models suggest that CNT concentration plays the most crucial role in determining

Z
T
.

Non-dominated Pareto optimal solutions consisting of different combinations of design variables are obtained by multi-objective optimization. Although a range of optimal solutions span over different regions of the search space, in general we note that longer CNTs boost Seebeck coefficient (

S
)

and electrical conductivity

(
σ
)

,

and smaller length lowers thermal conductivity (

k

), while higher diameter of CNTs increase

S

and lowers

σ

and

k
.

The results provide a general guideline for developing CNT-PANI nanocomposites with enhanced TE figure of merit.
Thepoeta–amatorpersists
Authors: Franklinos T E 
Published: November 2024

AbstractThis chapter considers the opening run of poems (3.1–5) as a cohesive programmatic group that establishes Propertius’ continued treatment of his amatory discourse through close intratextual engagement with his own earlier elegies. The elegist’s positioning of his verse in relation to the poems of Callimachus and Philitas is also explored, as well as his poetry’s engagement with the contemporary works of Horace (Odes) and Vergil (Georgics, Aeneid). A close reading of 2.34 is followed by a detailed discussion of the Hellenistic background to 3.1 and 3.3 that also considers the rôle of these poems in defining Propertius’ oeuvre against those of his contemporaries. The treatment of 3.2 continues the discussion of Propertius’ interaction with Horace’s lyric poetry and the elegist’s interest in his place in posterity. Discussion of 3.4, 3.5, and 3.7 explore Propertius’ poetological use of the militia amoris and his treatment of the Gallus fragment.