bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multi-sensor adaptive fusion and convolutional neural network-based acoustic emission diagnosis for initial damage of the engine
Authors: Han Cong , Liu Tong , Wang Yandong , Li Xin , Kou Ziming , Yang Guoan 
Published: December 2024

Abstract
Aiming at the problems of traditional fault diagnosis means that are difficult to identify initial damage, as well as the poor reliability and fault tolerance with a single sensor, an acoustic emission (AE) diagnosis method for initial damage of the engine based on multi-sensor adaptive fusion and convolutional neural network (CNN) is proposed. Firstly, under the premise of utilizing parametric analysis to characterize the multi-sensor AE signals, the feature parameter entropy is used to determine the primary and secondary relationships between multi-sensor signals, and then the AE feature parameter matrix is formed by adaptive fusion. Secondly, CNN is employed to mine and learn the fault feature combinations from the AE feature parameter matrix by multi-layer fusion to realize the identification and diagnosis for initial damage of the engine. Finally, the proposed method is validated on the engine test bench designed for initial damage identification and is compared with conventional methods in terms of diagnostic performance. The results demonstrate that the proposed method can achieve an identification accuracy of 98.83% for initial damage, and has advantages in various aspects such as TAMSE, K, F1mic and F1mac, which explicitly provides a theoretical and methodological basis for identifying initial faults comprehensively and accurately. This research not only enriches the theory and methods in the field of structural health monitoring, but also provides strong technical support for engine health management, which is expected to play a key role in the maintenance and guarantee of aviation engines in the future.
EDR-YOLOv8: a lightweight target detection model for UAV aerial photography using advanced feature fusion methods
Authors: Hao YongChang , Guo ChenXia , Yang RuiFeng , Zhao YuHui 
Published: December 2024

Abstract
Target detection from the aerial perspective of drones plays a crucial role in various fields. However, due to its unique high-altitude overhead view, images captured often exhibit a high proportion of small-sized targets amidst complex backgrounds and varying scales, posing significant challenges for detection. To address these issues, the EDR-YOLOv8 model has been proposed for drone-based aerial target detection. Firstly, the backbone of YOLOv8l is replaced with the high-resolution visual module EfficientViT, reducing the parameter count while maintaining the model’s capability to express important features. Secondly, the feature fusion network is redesigned with a four-level prediction layer to enhance the detection accuracy of small-sized targets. Additionally, the lightweight dynamic upsampler DySample is introduced to preserve more detailed target information. Finally, we design the feature fusion module C2f_RepGhost, which integrates the RepGhost bottleneck structure with YOLOv8’s C2f, thereby reducing computational complexity. Experimental results demonstrate that EDR-YOLOv8 achieves a 4.1% higher mAP@0.5 compared to the baseline YOLOv8l on the VisDrone2019-DET dataset, with a reduction of 40.5% in model size and 42.0% in parameter count. This illustrates that EDR-YOLOv8 achieves both lightweight modeling and improved detection accuracy.
Observation and characterisation of trapped electron modes in Wendelstein 7-X
Authors: Krämer-Flecken A , Proll J H E , Weir G , Costello P , Fuchert G , Geiger J , Heuraux S , Knieps A , Langenberg A , Vaz Mendes S , Pablant N , Pasch E , Rahbarnia K , Sabot R , Salazar L , Smith H M , Thomsen H , Windisch T , Xiang H M ,   the W7-X-team
Published: December 2024

Abstract
In the past, quasi coherent (QC) modes were reported for nearly all tokamaks. The general definition describes modes as QC when the magnitude squared coherence is in the range of 0.3 to 0.6. QC modes are observed in the plasma core as well as in the plasma edge and can have quite different physical origins. The one in the core are observed in plasmas with low collisionality, where the electron temperature exceeds the ion temperature in the plasma core. This is the case for electron cyclotron heating in general. The origin of these modes are electrons trapped within a magnetic mirror, as reported in the past from various fusion devices. The so-called trapped-electron modes (TEMs) belong to drift wave instabilities and can be destabilized by electron-temperature gradients in the plasma core. From the diagnostic point of view, QC modes appear as fluctuations in electron density and temperature. Therefore, the microwave reflectometer is very well suited to monitor these modes. This paper describes experiments, conducted at the Wendelstein 7-X stellarator (W7-X), which aim at detecting QC modes at low wave numbers. A poloidal correlation reflectometer installed at W7-X, is able to measure low wave numbers (

k
⊥

⩽

3.5

cm

−
1

). For medium line-averaged densities (

∫

n
e

⩽

6
×

10

19

m

−
2

) the plasma core is accessible for this diagnostic. For different magnetic configurations and plasma parameters, broad QC structures are observed in the coherence spectra. From the analysis of the rotation and the poloidal structure, these QC modes show the properties of electron-temperature-gradient driven TEMs. A linear relation between the mode velocity and the rotation frequency is found. The relation is uniform and confirms the nature of QC-mode observation as TEM in tokamaks, too.
Particle-in-cell methods in edge plasma physics: the PICLS code
Authors: Bottino A , Stier A , Boesl M , Hayward-Schneider T , Bergmann A , Coster D , Brunner S , Giannatale G Di , Villard L 
Published: December 2024

Abstract
Over the past decades, multiple gyrokinetic codes have shown to be able to simulate turbulence and associated transport in the core of Tokamak devices. However, their application to the edge and scrape-off layer (SOL) region presents significant challenges. To date, only few codes and models have been adapted to SOL/edge conditions. To further study the SOL region in particular, with its steep temperature and density gradients as well as large fluctuation amplitudes, the full-f particle-in-cell code PICLS has been developed. PICLS is based on a full-f gyrokinetic model with linearized field equations, considers kinetic electrons and uses logical sheath boundary conditions. In the past, PICLS was verified by applying it to a well-studied 1D parallel transport problem during an edge-localized mode in the SOL under both collisionless and collisional conditions, for which a Lenard–Bernstein collision operator was implemented. PICLS recently was extended towards three spatial dimensions to study turbulence in open-field-line regions in slab and closed-field-line toroidal geometries. In this work, we will focus on the models and methods we used for extending the code towards three spatial dimensions, including validation efforts and comparisons with other existing codes in closed-field-line geometry.
Characterization of the SCR-1 stellarator physics: investigating plasma discharge, MHD equilibrium calculations, and O-X-B mode conversion feasibility
Authors: Solano-Piedra R , Vargas V I , Araya-Solano L A , Vilchez-Coto F 
Published: December 2024

Abstract
The Stellarator de Costa Rica 1 (SCR-1) is a small modular stellarator that serves as a valuable research and training tool for plasma magnetic confinement. This study aimed to analyze the characteristics of SCR-1, including its peripheral systems, technical plasma discharge processes, and advancements in plasma characterization. In addition, this study explored a new heating mechanism and the factors that influence it. The current state of the device and plasma discharge are initially presented. Subsequently, the measurement process was utilized to determine the electronic density and plasma temperature using a single Langmuir probe and the results were compared with theoretical predictions based on the particle and energy balance. Additionally, the VMEC code was employed to calculate magnetic flux surfaces with characteristics such as a low aspect ratio, low beta parameter, negative magnetic shear, and decreasing rotational transform along magnetic flux surfaces. The Mercier criterion was employed to conduct a linear stability analysis, which identified a magnetic well that played a crucial role in the linear stability of the majority of magnetic flux surfaces. Feasibility studies of electron Bernstein waves (EBW) were conducted using the IPF-FMDC full-wave code. The results obtained from the IPF-FMDC full-wave code revealed that the O-X conversion percentage reached a maximum of 63% when considering radiation reflection in the vacuum vessel. Significant effects of plasma curvature on the O-X wave conversion and normalized electron density scale length were observed, while the change in the SCR-1 heating position did not produce a significant impact. Three damping mechanisms affecting O-X conversion were studied, and one of the principal effects was the SX-FX conversion due to steep electron density gradient. Additionally, stochastic electron heating showed a low electron field amplitude, which is important for limiting the EBW propagation.
Influence of irradiation temperature on REBCO tape degradation
Authors: Fischer David X , Devitre Alexis Rustam , Woller Kevin Benjamin , Fisher Zoe L , Whyte Dennis G , Hartwig Zachary 
Published: December 2024

Abstract
Commercial Rare Earth Barium Copper Oxide (REBCO) coated conductor tapes were irradiated at temperatures ranging from 20 K to 300 K with 1.2 MeV protons up to fluences of 1021 m-2. With in situ transport current measurements, we found that self-field critical currents (Ic) and transition temperature (Tc ) degrade in cold (20-200 K) irradiations by a factor of 1.6 faster than in 300 K irradiations. This warrants caution when basing the development of REBCO fusion magnets, which are operated at 20 K, on results from room-temperature irradiations. The degradation of Ic , n-value and Tc for irradiations in the range 20-200 K closely matched each other. However, small annealing effects can already be observed at 80 K, which is a lower threshold than previously thought. The observed Ic recovery increases with annealing temperature and is at 300 K four times higher than at 200 K. And finally, we compared the experimental data from this study with the calculated decrease of superfluid density, and find a surprisingly good correlation, supporting the Eisterer hypothesis for Ic degradation.
Thickness effect on the evolution of superconducting properties in FeSe0.4Te0.6 thin films
Authors: Zhu Yunrui , Zhang Yalin , Li Bin , Liu Jinxiang , Cheng Jie , Liu Shengli , Xing Zhongwen 
Published: December 2024

Abstract
A series of high-quality FeSe0.4Te0.6 epitaxial thin films with different thicknesses were fabricated on CaF2 substrates by pulsed laser deposition. With increasing the film thickness, the superconducting transition temperature is enhanced rapidly but deteriorates gradually in over thick films. The superconducting transition occurs in all films including the 5 nm one, and T
c above 21 K persists in the films with thicknesses from 45 to 180 nm. We find that T
c and the c-axis lattice constant show a nearly linear correlation, suggesting a strong interdependence between T
c and the lattice strain characteristics. The upper critical field, anisotropy and effective pinning energy are studied in detail for the 15, 60, 90 and 180 nm films. These observations provide key insights in understanding the thickness effect on the superconductivity of the FeSe0.4Te0.6 films.
Study on Impact Load Mitigation for High-Speed Water Entry Projectiles Using Aluminum Foam Buffering Structure
Authors: Guo Xiangying , Tian Xiangyu , Nan Tian 
Published: December 2024

Abstract
This paper investigated the fluid-solid coupling nonlinear problem of water entry by a high-speed projectile, considering cavitation, air cushion effect, and water vapor generated by the high-speed relative motion between the projectile and the fluid. To this end, a sandwich structure containing aluminum foam attached piston was studied and designed. The numerical simulation of the entry process was analyzed by LS-DYNA. The results show that the sandwich structure reduces the peak impact load. 87.47% reduction in peak force during water entry and aluminum foam has good cushioning effect.
Analysis of the Goodwin business cycle model with discrete delay and distributed delay in induced investment
Authors: Antonova A.O. 
Published: December 2024

Abstract
In this paper, a Goodwin model of business cycle with both discrete and distributed delays is considered. With the corresponding characteristic equation analyzed, the linear stability of the equilibrium is investigated. Numerical simulations are carried out to study the excitation conditions of the long-periodic Goodwin oscillations.
Group Classification and Numerical Study of Gross-Pitaevskii Systems
Authors: Bozhkov Yuri , Dimas Stylianos , Todorov Michail 
Published: December 2024

Abstract
We carry out a preliminary group classification for the 3+1 Gross-Pitaevskii system and the complete group classification for the 1 + 1 integrable component of the Gross-Pitaevskii system. For the exceptional potentials that the group classification sheds light a numerical study was performed.
On the Power Series Method for Solitons and Peakons of Nonlinear PDE
Authors: Olivares Erika , Vatchev Vesselin 
Published: December 2024

Abstract
In this paper we discuss the power series method to obtain traveling wave solutions of nonlinear PDE in one space variable. The method, including a recursive procedure for the coefficients and error estimate for the partial sums, is presented for the Camassa-Holm equation. Numerical examples of approximate single soliton and single peakon solutions are included.
The Effect of Climate Change on Coastal Morphology Changes in Lhokseumawe City Area
Authors: Hafli T Mudi , Fauzan M , Bustami  , Malasyi Syibral , Sarana David , Cahya Fran 
Published: December 2024

Abstract
The city of Lhokseumawe in Aceh is mostly located on the coast and is vulnerable to annual tidal waves, causing coastal settlements to sink. The rising sea levels in Indonesia, as observed by the IPCC using the TOPEX/POSEIDEN satellite, have reached 7 mm/year. A study was conducted to assess the impact of tidal waves exacerbated by sea level rise on changes in coastal morphology over 25 and 50 years. The study utilized the Delft3D numerical simulation method with various input data such as Topographic Data, bathymetry, tides, discharge, sediment, and waves. The results of the Delft3D modeling showed that erosion is slightly greater in the 25 and 50-year scenarios, with an average minimum erosion of about 12 m and a maximum erosion and retreat of about 18 m. However, in the 50-year scenario, there were points along the coast where sedimentation occurred, leading to the advancement of the coastline by about 36 m. These dynamic morphological changes in the coastal area of Lhokseumawe highlight the need for a coastal protection plan to address this vulnerability.
Public Space Quality Analysis of Putroe Phang Park in Banda Aceh City
Authors: Amri Khairul , Fuady Mirza 
Published: December 2024

Abstract
Green open space in the form of a city park is one of the important urban infrastructures because it not only functions in terms of ecology, aesthetics, and urban identity but also plays a role in increasing people’s happiness. Putroe Phang Park is a public open space located in the center of the city and adjacent to several other tourist attractions that are often visited by the public. Putroe Phang Park is also a city park with historical value in the glory era of the Aceh Sultanate. However, the public rarely visits Putroe Phang Park to enjoy recreation in the park. Therefore, further studies are needed to analyze the quality and usage of Putroe Phang Park as a public open space in accommodating community activities. The research method used is descriptive quantitative, with democratic, responsive, and meaningful variables, which are used to analyze the quality and usage of parks as public open spaces. The results of the study show that the conditions and factors that affect the low intensity of visitors are the unsuitability of facilities, lack of security level, and lack of education about the Pinto Khop Monument as a historical site. These results show the low value of meaningful impressions felt by visitors to Putroe Phang Park. For this reason, this study recommends increasing the quality and usage of Putroe Phang Park as a public open space by periodically updating and maintaining the existing facilities and complementing other park-supporting facilities.
Flexural strength of end-plate connection with several different bolt arrangements
Authors: Panjaitan Arief , Hasibuan Purwandy , Putra Rudiansyah , Afifuddin Mochammad , Fauzi Muhammad , Haiqal Muhammad 
Published: December 2024

Abstract
An end-plate connection is one of the common connections implemented in beam-column joints. This connection used a combination of bolts and welds as the connectors, so it is also specified as a semi-rigid connection. In general, the end-plate connection is applied to withstand the bending moment and to enhance its bending capacity, the connection area of the end-plate is generally enlarged. So far, the studies carried out to obtain the contribution of bolt arrangements to flexural strength are very limited, so maximum flexural capacity has not yet been optimally achieved. This research aims to examine the flexural strength of end-plate connections varied by bolt arrangements and bolt connection areas. The study was first conducted by analytically modeling the end-plate connection in SAP 2000, where the internal forces, i.e., shear force and moment were obtained from this numerical study. The theoretical studies were also carried out by considering internal troops to discover the influence of the bolt configuration on the end-plate connection to the flexural strength. The height of the area connection was also assorted, i.e., 100 mm, 200 mm, and 300 mm. The study revealed that enlarging area connections and increasing the number of bolts, reduce the tensile and shear stress at the maximum rate of 97.6 and 50 %, respectively. However, it can increase the flexural strength up to the rate 15 times from the minimum flexural strength. This result revealed that enlarging the connection area and adding the number of bolts can be suggested to enhance the flexural capacity when the end plate connection deals with a strong bending moment.
Using Multichannel Analysis of Surface Wave to Assess Bedrock Depth in Grand Aceh Baet Residential Area
Authors: Masrurah Zakia , Mufadhillah Putri Aulia , Adianur Rahiel , Mohammed Mustapha Adejo , Amsir Amsir 
Published: December 2024

Abstract
Inadequate foundation studies had over time led to quite a number of mishaps, resulting in loss of lives and properties. To address this issue, a Multichannel Analysis of Surface Wave (MASW) survey was conducted at the proposed Grand Aceh Housing site to characterize the subsurface and determine the depth to the bedrock, ensuring a stable foundation for the Rusunawa construction. The survey was performed along four profile lines using a PASI 16S-24P seismograph. The acquired data were processed with Geopsypack Geopsy and Dinver version 2.5.0 and then modelled into 2D data using Surfer version 13. The results identified four distinct layers with varying depths and thicknesses: the first layer with shear wave velocity ≤175 m/s is classified as soft soil layer (SE), the second layer as medium soil (SD) with Vs 175-350 m/s, the third layer as solid soil and soft rock (SC) with Vs 350-750 m/s, and the fourth layer as rock layer (SB) with Vs 750-1200 m/s. The findings of this study suggest that the fourth layer is bedrock, capable of supporting the Rusunawa foundation.
Vulnerability Study of Existing Office Building Before and After Rehabilitation Using Fragility Curve
Authors: Asri Luthfi Ainy , Masrilayanti  , Kurniawan Ruddy , Setiati Rehni , Pratama Ardi 
Published: December 2024

Abstract
Padang, located in West Sumatra, is an earthquake-prone area, with a major event occurring in 2009 that damaged many important buildings. An existing building was impacted by the earthquake, resulting in cracks and other damages. Subsequently, the building was rehabilitated to enhance its structural strength through jacketing. This study compares the building’s fragility curves before and after rehabilitation using the HAZUS standard and licensed Seismostruct software. The results show that, prior to rehabilitation, the building was vulnerable to damage due to earthquake. After rehabilitation, the structural strength improved more significantly, reducing damage levels from moderate to minor. Given the high seismic risk in Padang, it is crucial that building structures are designed with optimal resilience. The development of an analytical fragility curve is proposed for a more in-depth evaluation of building performance against future earthquakes, facilitating the identification of damage levels and enabling timely preventive and corrective measures.
Effect of ureolytic bacteria Bacillus sp. from local landfill for crack healing on flexural tensile strength of high-strength concrete
Authors: Aulia Teuku Budi , Fitri Lenni , Tanjung Jafril , Jalil Zulkarnain , Handoko Erfan , Badjie Mariama 
Published: December 2024

Abstract
High-strength concrete made with large amount of cement augmented with additives causing high hydration heat and large shrinkage during hardening process, making it susceptible to cracks at early age due to its still low tensile capacity. These cracks must be mitigated early. Self-healing method using ureolytic bacteria Bacillus sp. as concrete crack-healing can be smart solution to overcome this problem. Urease enzyme produced by ureolytic bacteria can hydrolyze urea and Ca2+ (derived from CaCl2) added as precursors to precipitate CaCO3 as concrete cracks closure biologically. This study aims to analyze effect of ureolytic bacteria Bacillus sp. cultivated from local landfill Gampong Jawa, Banda Aceh as crack self-healing on flexural tensile strength of high-strength concrete. Bacteria were immobilized into diatomaceous earth to increase viability during casting and after residing in harsh environment of concrete which used as 10% substitution for fine aggregates. Concentration of bacteria and growth media used were varied by 0%; 0.5%; 0.6%; and 0.7% of cement weight. Specimens were beams measuring 100×100×400mm which was given 1D10 mm tensile reinforcement to prevent brittle failure during testing. First, an initial crack load of 60% of 7 days concrete flexural tensile strength was given, then treatment was carried out for 28 days in water to observe crack healing for 7, 14, 21 and 28 days. After completing crack healing phase, flexural tensile capacity testing was carried out until the specimens collapsed. The results showed that flexural tensile capacity of high-strength concretes was 5.49 ton, 5.69 ton, 5.89 ton and 5.86 ton respectively and the percentage of concrete crack closure after healing phase for 28 days after being initially cracked was 4.76%; 77.90%; 87.09%; and 89.09% each, at variations of Bacillus sp. 0.0%; 0.5%; 0.6%; and 0.7%. Optimum value was obtained at bacterial percentage of 0.7% resulting in an increase both in flexural tensile capacity of 6.74% and in crack healing efficacy of 84.27% compared to non-bacteria concrete.