bluuebunny/crossref_metadata_2025_split huggingface dataset:
WIMP Dark Matter in bulk viscous non-standard cosmologies
Authors: González Esteban , Maldonado Carlos , Stefanía Mite N. , Salinas Rodrigo 
Published: October 2024

Abstract
In this paper, we explore an extension of the classical non-standard cosmological scenario in which the new field, ϕ, which interacts with the radiation component in the early universe, experiences dissipative processes in the form of a bulk viscosity. Assuming an interaction term given by Γ
ϕ

ρ

ϕ
, where Γ
ϕ
accounts for the decay rate of the field and ρ

ϕ
corresponds to its energy density, and a bulk viscosity according to the expression ξ=ξ
0
ρ

ϕ
ϕ1/2 in the framework of Eckart's theory, we apply this novel non-standard cosmology to study the parameters space for WIMPs Dark Matter candidate production. This parameter space shows deviations from the classical non-standard cosmological scenario, obtaining new regions to search for this candidate. In particular, for certain combinations of the free parameters, we found large regions in which the model can establish the DM and reproduce the current observable relic density.
MAUVE: An Ultraviolet Astrophysics Probe Mission Concept
Authors: Balakrishnan Mayura , Bowens Rory , Cruz Aguirre Fernando , Hughes Kaeli , Jayaraman Rahul , Kuhn Emily , Louden Emma , Louie Dana R. , McBride Keith , McGrath Casey , Payne Jacob , Presser Tyler , Reding Joshua S. , Rickman Emily , Scrandis Rachel , Symons Teresa , Wiser Lindsey , Jahoda Keith , Kataria Tiffany , Nash Alfred , X Team 
Published: October 2024

Abstract
We present the mission concept “Mission to Analyze the UltraViolet universE” (MAUVE), a wide-field spectrometer and imager conceived during the inaugural NASA Astrophysics Mission Design School. MAUVE responds to the 2023 Announcement of Opportunity for Probe-class missions, with a budget cap of $1 billion, and would hypothetically launch in 2031. However, the formulation of MAUVE was an educational exercise and the mission is not being developed further. The Principle Investigator-led science of MAUVE aligns with the priorities outlined in the 2020 Astrophysics Decadal Survey, enabling new characterizations of exoplanet atmospheres, the early-time light curves of some of the universe’s most explosive transients, and the poorly-understood extragalactic background light. Because the Principle Investigator science occupies 30% of the observing time available during the mission’s 5 yr lifespan, we provide an observing plan that would allow for 70% of the observing time to be used for General Observer programs, with community-solicited proposals. The onboard detector (THISTLE) claims significant heritage from the Space Telescope Imaging Spectrograph on Hubble, but extends its wavelength range down to the extreme UV. We note that MAUVE would be the first satellite in decades with the ability to access this regime of the electromagnetic spectrum. MAUVE has a field of view of 900″ × 900″, a photometric sensitivity extending to m
UV ≤ 24, and a resolving power of R ∼ 1000. This paper provides full science and mission traceability matrices for this concept, and also outlines cost and scheduling timelines aimed at enabling a within-budget mission and an on-time launch.
ScatterX: A software for fast processing of high-throughput small-angle scattering data
Authors: Xie 谢 Fei 飞 , Xie 解 Mei 梅 , Song 宋 Baoyu 宝玉 , Guo 郭 Qiaoyu 桥雨 , Jiao 焦 Xuechen 学琛 
Published: October 2024

Abstract
Scattering experiments become increasingly popular in modern scientific research, including the areas of materials, biology, chemistry, physics, etc. Besides, various types of scattering facilities have been developed recently, such as lab-based x-ray scattering equipment, national synchrotron facilities and large neutron facilities. These above-mentioned trends bring up fast-increasing data amounts of scattering data, as well as different scattering types (x-ray, neutron, laser and even microwaves). To help researchers process and analyze scattering data more efficiently, we developed a general and model-free scattering data analysis software based on matrix operation, which has the unique advantage of high throughput scattering data processing, analysis and visualization. To maximize generality and efficiency, data processing is performed based on a three-dimensional matrix, where scattering curves are saved as matrices or vectors, rather than the traditional definition of paired values. It can not only realize image batch processing, background subtraction and correction, but also analyze data according to scattering theory and model, such as radius of gyration, fractal dimension and other physical quantities. In the aspect of visualization, the software allows the modify the color maps of two-dimensional scattering images and the gradual color variation of one-dimensional curves to suit efficient data communications. In all, this new software can work as a stand-alone platform for researchers to process, analyze and visualize scattering data from different research facilities without considering different file types or formats. All codes in this manuscript are open-sourced and can be easily implemented in matrix-based software, such as MATLAB, Python and Igor.
Clustering for mitigating subject variability in driving fatigue classification using electroencephalography source-space functional connectivity features
Authors: Nguyen Khanh Ha , Tran Yvonne , Craig Ashley , Nguyen Hung , Chai Rifai 
Published: October 2024

Abstract

Objective. While Electroencephalography (EEG)-based driver fatigue state classification models have demonstrated effectiveness, their real-world application remains uncertain. The substantial variability in EEG signals among individuals poses a challenge in developing a universal model, often necessitating retraining with the introduction of new subjects. However, obtaining sufficient data for retraining, especially fatigue data for new subjects, is impractical in real-world settings. Approach. In response to these challenges, this paper introduces a hybrid solution for fatigue detection that combines clustering with classification. Unsupervised clustering groups subjects based on their EEG functional connectivity (FC) in an alert state, and classification models are subsequently applied to each cluster for predicting alert and fatigue states. Main results. Results indicate that classification on clusters achieves higher accuracy than scenarios without clustering, suggesting successful grouping of subjects with similar FC characteristics through clustering, thereby enhancing the classification process. Significance. Furthermore, the proposed hybrid method ensures a practical and realistic retraining process, improving the adaptability and effectiveness of the fatigue detection system in real-world applications.
Universal energy and magnetisation distributions in the Blume–Capel and Baxter–Wu models
Authors: Macêdo A R S , Plascak J A , Vasilopoulos A , Fytas N G , Akritidis M , Weigel M 
Published: October 2024

Abstract
We analyse the probability distribution functions of the energy and magnetisation of the two-dimensional Blume–Capel (BC) and Baxter–Wu (BW) models with spin values

S
∈
{
1

/

2
,
1
,
3

/

2
}

in the presence of a crystal field Δ. By employing extensive single-spin flip Monte Carlo simulations and a recently developed method of studying the zeros of the energy probability distribution we are able to probe, with a good numerical accuracy, several critical characteristics of the transitions. Additionally, the universal aspects of these transitions are scrutinised by computing the corresponding probability distribution functions. The energy distribution has been underutilised in the literature when compared to that of the magnetisation. Somewhat surprisingly, however, the former appears to be more robust in characterising the universality class for both models upon varying the crystal field Δ than the latter. Finally, our analysis suggests that in contrast to the BC ferromagnet, the BW model appears to suffer from strong finite-size effects, especially upon increasing Δ and S, that obscure the application of traditional finite-size scaling approaches.
Effects of tidal bore on hydraulic transients in low-head pressurized water conveyance systems
Authors: Liu Jinhao , Zhu Jianzhong , He Wei , Wang Baoluo , Zhu Lixiong , Tang Yiping , Wang Chaoyue , Wang Fujun 
Published: October 2024

Abstract
In low-head pressurized water conveyance systems affected by tidal bore, the influence of tidal bore on the stability of the system is significant. This study focuses on a pumping station located on the Qiantang River to investigate the impact of tidal bore under extreme conditions on hydraulic transients in low-head pressurized water conveyance systems. Tidal bore height and maximum tidal bore velocity are considered as key parameters, and their effects are modelled under extreme conditions in hydraulic transient analysis. Two operational scenarios, including normal operation and pumps shutdown, are simulated. The results indicate that, during normal pump operation, increases in tidal bore height and maximum velocity lead to greater fluctuations in surge tank water level, pump flow fluctuations, and pressure pulsations in the pipeline. In scenarios involving pumps shutdown and gates closure, increases in tidal bore height and maximum velocity result in larger fluctuations in surge tank water level. Additionally, since the gates are closed when pumps shutdown, tidal bore effects have minimal influence on pump flow rates. Therefore, the maximum pressure in the middle section of pipeline is primarily controlled by the tidal bore height and maximum flow rate. When tidal bore height is relatively high, maximum pressure occurs rapidly, whereas when maximum tidal bore velocity is high, the increase in maximum pressure occurs slower. This study introduces a method for incorporating tidal bore effects into hydraulic transient calculations, providing valuable insights for project design and construction. It serves as a reference for transient flow analysis in similar low-head pressurized water conveyance systems affected by tidal bore.
Research on the hydraulic loss in the side inlet and outlet of a pumped storage power station
Authors: Guo Miao , Huang Zihao , Jiang Kuichao , Shen Yan , Wang Wei 
Published: October 2024

Abstract
The side inlet and outlet play an important role in the hydraulic system of a pumped storage power station. The flow patterns within it are of great significance to the safe operation of the whole project. The aim of this study was to reveal the quantitative relationship between various flow patterns and hydraulic losses within the side inlet and outlet, the wall roughness theoretical model and the RNG k-ε turbulence model were combined to investigate the internal flow, vortex distribution, hydraulic loss, and other hydraulic characteristics within the side inlet and outlet for pumping and electric power generating cases, the results of the numerical model are in good agreement with the experimental results. In addition, a hydraulic losses model in the side inlet/outlet based on the energy conservation equation and the distribution of the various hydraulic losses were present. The results show that various types of vortices occurred in the reservoir area close to the inlet and outlet region when the inlet flow rate of the pumping case is higher than 1.67 Q* (Dimensionless flow rate Q*= Q actual flow/ Q rated flow of a unit), and the flow rate distribution is more nonuniform for the pumping case. The hydraulic loss is higher and mainly concentrated in the adjustment section, the anti-vortex beam section, and the side-and middle-channel diffusion section for the electric power generating case. The results of this paper can be used in the optimisation design in the related fields.
Research on steel structure point cloud skeleton extraction and construction accuracy evaluation based on BIM model assistance
Authors: Zhang Ke , Xu Yucheng , Wang Lei , Gao Yuan 
Published: October 2024

Abstract
In modern construction projects, the rapid development of 3D laser scanning technology and Building Information Modeling (BIM) technology has led to increasingly close integration of the two in engineering applications. By combining these two data sources, new methods for quality control in steel structure construction are provided. This paper proposes a method for extracting the skeleton of steel structures from point clouds, assisted by BIM models, and uses the refined skeleton data to evaluate construction accuracy. First, the collected 3D laser point cloud of the steel structure is registered using the BIM model. An original skeleton extraction algorithm is then employed to preprocess the steel structure point cloud, eliminating noise and redundant points to ensure data accuracy. Next, the denoised steel structure point cloud is combined with the designed BIM model to assess the accuracy of the actual construction. Experimental results show that this method not only effectively reduces noise in the measured point cloud and improves data quality but also accurately evaluates construction accuracy, providing reliable technical support for engineering quality control.
Design and DSP implementation of signal processing module for underwater acoustic transponder
Authors: Luo Yu , Fu Chaoqian , Peng Dongdong , Wang Haotian , Yao Yingshuo , Yan Lulu 
Published: October 2024

Abstract
Due to the fact that sound waves are the most effective carrier for underwater information transmission, the detection of underwater acoustic signals has become a key link in optimizing the performance of transponders in underwater positioning systems. In this paper, the signal processing module of the hydroacoustic transponder is designed to address the problem of low detection accuracy of the transponder due to the propagation deformation of hydroacoustic signals in hydroacoustic channels. The module uses the TMS320C6748 processor to achieve the transmission, acquisition, and detection of hydroacoustic spread spectrum signals. Among them, the signal detection algorithm in this module integrates an orthogonal demodulation algorithm, carrier synchronization algorithm, and matched filtering algorithm. It has been verified through simulation that it can enhance the anti-interference performance of the module, and the module also adopts a ping-pong caching mechanism to achieve real-time signal processing. Finally, pool testing has shown that this module can effectively assist the responder in completing the response task.
InGaAs-based transmission trap detector at telecom wavelengths
Authors: Kübarsepp Toomas , Sildoja Meelis-Mait , Vaigu Aigar , Ansko Ilmar , Vendt Riho , Vabson Viktor 
Published: October 2024

AbstractA photodetector based on two large-area InGaAs-photodiodes in transmission-type trap configuration has been studied. The alignment of the photodiodes provides polarisation-independent performance of the photodetector. The responsivity and spatial uniformity of responsivity and transmittance of InGaAs-based transmission trap detector are reported at telecommunication laser wavelengths of 852 nm, 1309 nm and 1545 nm.
The dibenzoterrylene-C60 composite structure as a possible new single-photon source - growth and optical analysis
Authors: Hirt F. , Christinck J. , Hofer H. , Wolter S. , Stummvoll M. , Reutter A. , Schlickum U. , Kück S. 
Published: October 2024

Abstract
A sample fabrication approach based on organic molecular beam deposition creating a new molecule-based emitter structure and its optical analysis is presented. The polycyclic aromatic hydrocarbon dibenzoterrylene (DBT, C38H20) was deposited between layers of C60-fullerenes, which serve as a protective matrix. It was found that this structure maintains the DBT’s optical properties [1, 2], but a potentially quenching impact cannot be excluded. Raman spectra of the composite were collected proving the molecules’ preserved integrity after being evaporated at high temperatures. Finally, the results of confocal laser scanning microscopy show fluorescent molecular clusters.
A germanium-vacancy center in diamond as single-photon source for radiometric application
Authors: Christinck J. , Hirt F. , Hofer H. , Georgieva H. , Liu Z. , Etzkorn M. , Dunatov T. , Jakšić M. , Forneris J. , Kück S. 
Published: October 2024

Abstract
We present the metrological characterization of a single-photon source based on a germanium-vacancy center in diamond under a solid immersion lens in a confocal microscope setup at room temperature. It was characterized in terms of the emission’s spectral distribution, single-photon purity, temporal stability and the emitter’s excited state lifetime and saturation behavior. An Allan deviation analysis was performed on the emission of the single-photon source to determine the optimal averaging time of the photon flux. The single-photon source was used for the relative calibration of the detection efficiency of two single-photon avalanche diode detectors. The results were compared with measurements using attenuated laser light for the calibration of the detectors.
CFD-PBM simulation of nanobubble distribution characteristics in horizontal pipeline
Authors: Lei Ming , Zhang Liting , Li Qifen , Yang Yongwen , Deng Junkai 
Published: October 2024

Abstract
The distribution characteristics of flow and transmission of nanobubbles in pipelines are of great significance for their applications in energy storage, agriculture, medicine, and other fields. The existing numerical simulation studies for nanobubbles in pipeline gas-liquid two-phase mixing still suffer from the deficiency of capturing the accuracy of the complex behavior of nanobubbles in the actual environment and cannot fully consider the influence of the dynamic behavior of nanobubbles, which limits the efficiency and accuracy of the simulation. In order to reveal the development law of nanobubbles in pipeline flow, this paper simulates the flow of nanobubbles in the pipeline based on the population balance model (PBM) and combines it with computational fluid dynamics (CFD) to investigate the effects of gas phase volume fraction on the flow of nanobubbles in the horizontal pipeline, and to study their distribution characteristics. The calculation results show that the increase in the volume fraction of the imported gas phase leads to a more dispersed particle size distribution, an increase in size, and a decrease in the distribution density of the nanobubbles.
Effect of surface treatment on oxidation film of 55SiCr spring steel wire
Authors: Zhang Honglong , Zhang Tao , Yang Yong , Zhang Fengshan , Jiang Ling 
Published: October 2024

Abstract
In this work, the surface pretreatments of 55SiCr spring steel wire rods were conducted using shot blasting and phosphating. After drawing, the steel wire was heated at 950°C × 15 s, followed by oxidation treatment with high-temperature steam or air for 3 seconds, and tempering treatment at 520°C. The effects of different surface treatment methods on the surface oxide film of spring steel wire were studied using stereomicroscopy, SEM, EDS, and XRD. The results showed that the steel wire surface oxide film with phosphating pretreatment was thicker and easy to fall off. The thickness of the oxide film formed by phosphating pretreatment samples increased by 2.1 um (high-temperature steam) and 0.3 um (air) compared to the shot-blasting samples under different oxidation atmospheres. High-temperature steam oxidation treatment significantly increased the thickness of the oxide film by 0.65 um (shot blasting) and 2.45 um (phosphating) under different surface pretreatment conditions. The outer surface of the oxide film turned black with high-temperature steam oxidation treatment and turned yellowish brown with air oxidation treatment. By both above oxidation treatments, the oxide film showed a multilayer structure, with enrichment of Cr and Si on the inner side.
Optimal strategies for virtual power plants to participate in medium- and long-term power trading in the context of contracts for difference (CFDs)
Authors: Nie Jianghong , Gan Ling , Wang Jing , Xiao Kun , Zhou Congpei 
Published: October 2024

Abstract
In the context of virtual power plants gradually joining the medium-and long-term power market transactions, the decision-making problem of this new subject in the transaction process has attracted wide attention. Since virtual power plants possess distributed power sources on the supply side, as well as variable loads, energy storage, and other resources on the customer side, they are able to participate in both the sale and purchase of electricity in the medium-and long-term electricity market at the same time, which leads to the need for the relevant analysis to be divided into the two cases of sale and purchase of electricity. At the same time, due to the wide application of the CFD mechanism, power transactions should also take into account the compensation adjustment brought by this mechanism in addition to the market price. To sum up, this paper constructs a static game model for the virtual power plant’s power sales and purchasing strategies in the medium-and long-term power market under the premise of the CFD mechanism. The analysis shows that the optimal trading volume is related to the CFD volume, the total volume of power supplied by the bidding, the market price, etc. The relevant conclusions will help market managers to grasp the market price. The conclusions of the analysis help market managers grasp the key transaction information and assist virtual power plants to participate in medium-and long-term power transactions in an orderly manner.
Research on distributed optimal scheduling method based on consensus
Authors: Duan Liwei , Yang Chao 
Published: October 2024

Abstract
With access to large-scale distributed power sources, the physical structure of the power grid system tends to be distributed. The application of traditional centralized optimal scheduling methods will lead to a surge in communication overhead and computational complexity, which will affect the performance and efficiency of the solution. In this paper, the minimum operating cost of the system is taken as the goal, and the distributed direct current optimal power flow (DC-OPF) optimization calculation of the photovoltaic-storage power generation system is considered to approximately solve the economic dispatch problem. The DC optimal power flow model with energy storage charging penalty is constructed. Then, the distributed optimization method based on the consensus alternating direction multiplier method (ADMM) is adopted. By decoupling the objective function and constraints of the whole system problem, the fully distributed DC-OPF calculation is realized by introducing the global consensus variable to deal with the boundary buses. Finally, the improved IEEE 30-bus example is used to test the method, and the simulation results verify the convergence and accuracy of the method.