bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and verification of a novel self-powered sensing system for intelligent bearings
Authors: Li Zhen , Yuan Zekun , Wang Dandan , Mao Yuze , Wang Liqin , Shu Kun , Zuo Yichao , Ma Xinxin 
Published: November 2024

Abstract
This paper presents the development of a novel self-powered sensing system for roller bearing NU208. The system was designed based on an analysis of the bearing’s structural parameters and service condition monitoring signals. Through the selection of appropriate hardware and the design of a suitable circuitry, the power supply circuit, the main controller circuit, the parameter monitoring circuit, and the wireless data transmission circuit have been constructed. Additionally, the wireless data receiving module program and the upper computer software interface program have been developed. The upper computer software interface enables the real-time display of bearing vibration, cage speed, inner ring speed, and temperature signals. The self-powered sensing system is integrated and encapsulated within the roller bearing NU208, and its performance is verified on a small bearing test bench. The test results are precise and the data accuracy and output frequency meet the anticipated requirements. The self-powered sensing system developed in this paper fulfills the criteria for intelligent bearings that do not require an external power source or monitoring signals via cable transmission. It has significant scientific value and engineering significance for the study of intelligent bearings’ autonomous decision-making and self-regulation.
Study of spot distance on resistance spot welding quality: a 1DCNN-BiLSTM-Attention-based online inspection method
Authors: Deng Haofeng , Gao Xiangdong , Lv Zigui , Tan Wenzheng , Gao Pengyu 
Published: November 2024

Abstract
Resistance spot welding (RSW) is widely employed in the automotive and home appliance industries due to its high efficiency, low cost, and suitability for automation. However, traditional quality detection methods rely on destructive testing, leading to inefficiencies and resource wastage. This paper presents a novel quality inspection model for RSW that utilizes a one-dimensional convolutional neural network, bidirectional long short-term memory network, and attention mechanism (1DCNN-BiLSTM-Attention) to address the challenges of extracting temporal data under varying spot distances. The model integrates a residual linking mechanism and Kolmogorov–Arnold networks to enhance feature extraction and performance. Experimental results reveal that the model demonstrates strong predictive capabilities across different spot distances, with particularly notable performance at 10 mm spacing, achieving a mean absolute error of 0.0632, a root mean square error of 0.0603, and an R
2 value of 0.7513. These findings underscore the model’s ability to provide high-precision predictions, even under conditions influenced by significant shunt effects.
On the role of cross-slip and collinear annihilation in dynamic recovery
Authors: Madec Ronan , Devincre Benoit , Kubin Ladislas 
Published: November 2024

Abstract
Dynamic recovery (DR) during single crystal stage III is believed to result from cross-slip or at least be triggered by this dislocation mechanism. However, the precise causal chain of events that induces a return to a low hardening value, similar to stage I, after the strong hardening of stage II, remains unclear. Unlike strain hardening, which has been the subject of numerous successful 3D Dislocation Dynamics simulations (3D-DD), DR has been sparsely studied. This is primarily because it requires achieving large strains to reach stage III, which is difficult to obtain in a sufficiently large volume to be statistically meaningful for dislocation modeling, especially under quasi-static loading. However, it is possible to conduct 3D-DD simulations with high dislocation density to approximate conditions close to stage III and attempt to identify the potential causes of recovery. This is what we aimed to do in the present study, with simulations at different dislocation densities and by testing specific dislocation mechanisms separately to determine their exact contributions. Our results, while not definitive, provide insight into the origin of DR. Firstly, we demonstrate that a previously neglected athermal mechanism, i.e. collinear annihilation, plays an important role in DR, being the only forest mechanism that induces virtually no storage. Secondly, we show that plastic instabilities favoring a reduction in the number of active systems are a highly effective way of reducing dislocation storage. Lastly, cross-slip is found to reduce dislocation storage under very specific slip conditions, suggesting that these conditions should exist during Stage III.
On time-periodic solutions to an interaction problem between compressible viscous fluids and viscoelastic beams
Authors: Kreml Ondřej , Mácha Václav , Nečasová Šárka , Trifunović Srđan 
Published: November 2024

Abstract
In this paper, we study a nonlinear fluid-structure interaction problem between a ‘square-root’ viscoelastic beam and a compressible viscous fluid. The beam is immersed in the fluid which fills a two-dimensional rectangular domain with periodic boundary conditions in both directions, while both the beam and the fluid are under the effect of time-periodic forces. By using a decoupling approach, at least one time-periodic weak solution to this problem is constructed which has a bounded energy and a fixed prescribed mass. The lack of a priori energy bounds is overcome by a series of estimates based on a careful choice of parameters. The most challenging one is the pressure estimate, which is obtained by utilizing the specific periodic geometry and the Bogovskiǐ operator on a fixed domain that has a uniform constant. With uniform estimates and improved regularity of the beam as in (Muha and Schwarzacher 2023 Ann. Inst. Henri Poin. Anal. Non Lineaire
39 1369–412), the time-periodic solution is constructed by a series of limit procedures, following the finite-dimensional time-space construction from (Feireisl et al 2012 Arch. Rational Mech. Anal.
204 74586).
Utilizing smartphone proximity sensor to analyse accelerated motion of object in an inclined plane and determine the acceleration and kinetic friction coefficient
Authors: Susanti Eka , Nawiyah Nawiyah , Janna Fadhillah , Angraini Reza , Zahra Nabila , Kariyma Rizqa , Hidayat Rahmat 
Published: November 2024

Abstract
In this work, we launched smartphones with a moving object to analyse the motion on an inclined plane. The data of time versus distance was acquired by utilizing a smartphone proximity sensor to record time intervals between detection objects whose distance had been set beforehand. The plot of time versus distance was used to analyze the characteristics of accelerated motion. Meanwhile, time squared versus distance was used to determine acceleration. The inclination angle was varied to observe the effect on the motion characteristic and acceleration value. Furthermore, kinetic friction coefficient existing along the object’s motion was also calculated.
Exact solutions and bifurcations of the new (3+1)-dimensional generalized Kadomstev-Petviashvili equation
Authors: Meng Hui , Zheng Zhen , Zhang Jing , Wang Zenggui 
Published: November 2024

Abstract
The exact solutions of the new generalized (3+1)-dimensional Kadomtsev-Petviashvili (ngKP) equation by using the modified extended tanh-function method, the improved (

G
′

/

G

) method and the generalized Riccati equation mapping method are considered. Different types of exact traveling wave solutions are obtained, enriching the exact solutions of this equation. In addition, the dynamical behaviors of the different types of solutions obtained by the equation are graphically presented using 3D, 2D and density plots. Then, the phase portraits of the equations are obtained through the bifurcation theory to verify the validity of the previous three methods. Finally, the comparison between our results and the known results is given, it can be concluded that we have provided a large number of new travelling wave solutions to the equation.
The effect of quantum decoherence on inflationary gravitational waves
Authors: de Kruijf Jessie , Bartolo Nicola 
Published: November 2024

Abstract
The theory of inflation provides a mechanism to explain the structures we observe today in the Universe, starting from quantum-mechanically generated fluctuations. However, this leaves the question of: how did the quantum-to-classical transition, occur? During inflation, tensor perturbations interact (at least gravitationally) with other fields, meaning that we need to view these perturbations as an open system that interacts with an environment. In this paper, the evolution of the system is described using a Lindblad equation, which describes the quantum decoherence of the system. This is a possible mechanism for explaining the quantum-to-classical transition. We show that this quantum decoherence during a de Sitter phase leads to a scale-dependent increase of the gravitational wave power spectrum, depending on the strength and time dependence of the interaction between the system and the environment. By using current upper bounds on the gravitational wave power spectrum from inflation, obtained from CMB and the LIGO-Virgo-KAGRA constraints, we find an upper bound on the interaction strength. Furthermore, we compute the decoherence criterion, which indicates the minimal interaction strength needed for a specific scale to have successfully decohered by the end of inflation. Assuming that the CMB modes have completely decohered, we indicate a lower bound on the interaction strength. In addition, this decoherence criterion allows us to look at which scales might not have fully decohered and could still show some relic quantum signatures. Lastly, we use sensitivity forecasts to study how future gravitational-wave detectors, such as LISA and ET, could constrain the decoherence parameter space. Due to the scale-dependence of the power spectrum, LISA could only have a very small impact. However, ET will be able to significantly improve our current constraints for specific decoherence scenarios.
Kerr black hole mimickers sourced by a string fluid
Authors: Brustein Ram , Medved A.J.M. , Simhon Tamar 
Published: November 2024

Abstract
We present rotating solutions of Einstein's gravity coupled to an effective Born-Infeld theory that describes the end of open-string tachyon condensation after the decay of an unstable D-brane or a brane-antibrane system. The geometry of these solutions is that of the rotating frozen star. The solutions are stationary, ultracompact, can be made non-singular via a regularization procedure and their exterior geometry is identical, for all practical purposes, to that of the Kerr solution. The Born-Infeld matter consists of radial electric-flux tubes that emanate from, or end at, the ellipsoidal core of the star. Each end of the flux tubes carries an electric charge, so that the electric field can be viewed as being sourced by an ellipsoidal charge distribution of positive and negative charges near the center of the star. Meanwhile, the star's outer layer is equal and oppositely charged, resulting in a vanishing electric field in the external spacetime. We show that these rotating solutions are ultrastable against radial perturbations, just like their static frozen star counterparts. They are also effectively immune to ergoregion instabilities, as we discuss.
Primordial black holes and scalar induced density perturbations: the effects of probability density functions*
Authors: Zhou 周 Jing-Zhi 敬之 , Kuang 况 Yu-Ting 宇庭 , Chang 常 Zhe 哲 , Zhang 张 Xukun 旭坤 , Zhu 朱 Qing-Hua 庆华 
Published: November 2024

Abstract
We investigate the second order energy density perturbation

induced by small-scale Gaussian and local-type non-Gaussian primordial curvature perturbations. The relative abundance of primordial black holes (PBHs) is calculated in terms of the probability density functions (PDFs) of the total energy density perturbation

. The effects of the second order density perturbation greatly reduce the upper bounds of small-scale power spectra of primordial curvature perturbations by one to two orders of magnitude. For a log-normal primordial power spectrum, its amplitude

is constrained to be approximately

, and for the local-type non-Gaussianity with

, the upper bound of

is approximately

.
Climate shapes baseflows, influencing drought severity
Authors: Zaerpour Masoud , Hatami Shadi , Ballarin André S , Papalexiou Simon Michael , Pietroniro Alain , Adamowski Jan Franklin 
Published: November 2024

Abstract
Baseflow, the sustained flow from groundwater, lakes, and snowmelt, is essential for maintaining surface water flow, particularly during droughts. Amid rising global water demands and climate change impacts, understanding baseflow dynamics is crucial for water resource management. This study offers new insights by assessing baseflow controls at finer temporal scales and examining their relationship with hydrological drought flows. We investigate how climatic factors influence seasonal baseflow in 7138 global catchments across five major climate regions. Our analysis identifies precipitation as the primary driver, affecting 58.3% of catchments, though its impact varies significantly across different climates. In temperate regions, precipitation dominates (61.9% of catchments), while in tropical regions, evaporative demand is the leading factor (47.3%). Snow fraction is particularly crucial in both snow-dominated (20.8%) and polar regions (48.5%). Negative baseflow trends generally emerge where the effects of evaporative demand or snow fraction outweigh those of precipitation. Specifically, in northern regions and the Rocky Mountains, where snow fraction predominantly controls baseflow changes, a negative trend is evident. Similarly, in tropical catchments, where evaporative demand drives baseflow changes, this also leads to a negative trend. Additionally, our findings indicate that baseflow changes are closely linked to hydrologic drought severity, with concurrent trends observed in 69% of catchments. These findings highlight the relationship between baseflow changes, the severity of hydrologic drought and shifts in precipitation, evaporative demand, and snow dynamics. This study provides crucial insights for sustainable water resource planning and climate change adaptation, emphasizing the importance of managing groundwater-fed river flows to mitigate drought impacts.
Diverse impacts of sea ice and ice shelf melting on phytoplankton communities in the Cosmonaut Sea, East Antarctica
Authors: Qi Qianqian , Hao Qiang , Yang Guang , Cao Shunan , Kang Jiawen , Hu Jiashun , Zheng Minfang , Chen Mengya , He Jianfeng , Chen Min 
Published: November 2024

Abstract
Antarctic sea ice and glacier melt profoundly impacts marine ecosystems. Our study in the Cosmonaut Sea summer measures seawater oxygen isotopes, size-fractionated chlorophyll-a, and phytoplankton communities. We quantify sea ice meltwater, meteoric water, and winter water contents using a Bayesian isotope-mixing model. Contrary to common belief, our findings suggest that the reduced net export of sea ice to the north and the basal melting of ice shelves have deepened the mixed layer in coastal waters, altering the survival depth of phytoplankton. Freshwater primarily stimulates phytoplankton growth by supplying dissolved iron rather than by increasing water stability, which influences the size distribution and species composition of the phytoplankton community. These insights highlight the complex interplay between freshwater inputs, nutrient dynamics, and phytoplankton communities, and are crucial for understanding the dynamics of Antarctic ecosystem and its vulnerability to climate change.
Graded colour Lie superalgebras for solving Lévy-Leblond equations
Authors: Ryan Mitchell 
Published: November 2024

Abstract
The Lévy-Leblond equation with free potential admits a symmetry algebra that is a

Z

2

×

Z

2

-graded colour Lie superalgebra (see Aizawa–Kuznetsova–Tanaka–Toppan, 2016). We extend this result in two directions by considering a time-independent version of the Lévy-Leblond equation. First, we construct a

Z

2
3

-graded colour Lie superalgebra containing operators that leave the eigenspaces invariant and demonstrate the utility of this algebra in constructing general solutions for the free equation. Second, we find that the ladder operators for the harmonic oscillator generate a

Z

2

×

Z

2

-graded colour Lie superalgebra and we use the operators from this algebra to compute the spectrum. These results illustrate two points: the Lévy-Leblond equation admits colour Lie superalgebras with gradings higher than

Z

2

×

Z

2

and colour Lie superalgebras appear for potentials besides the free potential.
A review of sugarcane bagasse ash: Characteristics, properties and sustainable applications in concrete
Authors: Goyal Pratyush Kumar , Murmu Meena 
Published: November 2024

Abstract
Concrete is among the most utilized construction materials in the world, with cement as a primary component. Integrating Sugarcane Bagasse Ash (SCBA) into concrete production offers solutions for utilizing this agro-industrial byproduct while reducing environmental impacts. This includes minimizing the need for limestone removal in cement production, thereby lowering carbon dioxide emissions and preserving natural deposits for cement manufacturing. To address this challenge, researchers and practitioners are increasingly exploring sustainable alternatives to traditional concrete components. This review focuses on sustainable applications in concrete, with a specific emphasis on environmentally friendly materials and practices that can reduce the carbon footprint of concrete production and improve its long-term sustainability. Sugarcane bagasse ash (SCBA) is a byproduct of the sugar industry used as a sustainable alternative material in concrete production. A comprehensive review provides an overview of the characteristics and properties of SCBA, as well as its sustainable applications in concrete. This paper examines the physical properties and chemical composition of SCBA, emphasizing its potential as a supplementary cementitious material. Various studies on the use of Sugarcane bagasse ash in concrete mixtures are summarized, focusing on its effects on workability by slump test of concrete may increase or decrease with different SCBA concentrations. Additionally, it explores the effects on mechanical properties, durability evaluated via water absorption tests, and microstructural properties of concrete. Generally, concrete containing SCBA exhibits improved mechanical properties with increased SCBA substitution, with an optimal replacement ratio ranging from 5% to 15%.
Application of the theory of planned behaviour to assess the impact of the intention of architects, designers, and engineers regarding the usage of sustainable construction materials (SCM) in India
Authors: Joshi R , Vashishtha K , Tripathi S , Roy S , Dhankar C 
Published: November 2024

Abstract
The present interdisciplinary (psychology and architecture) study was conducted to assess the impact of intention on the behaviour of architects, designers, and engineers related to the recommendation and usage of sustainable construction materials (SCM). The authors employed the theoretical framework of planned behaviour (TPB) on sustainable construction materials usage by different stakeholders and developed a questionnaire based on the same. Fifty-nine architects/designers and engineers filled out the developed questionnaire after giving their written informed consent. The survey was followed by semi semi-structured interview schedule, developed by the researchers. The results demonstrated that the intention to use SCM was present, but it was not reflected much in the actual behaviour. The semi-structured interview schedules findings like attitude, social norms, perceived effectiveness, and value proved to have influenced intention, which in turn influenced actual behaviour. The results of the study were substantiated by themes generated by semi-structured interviews that were conducted with architects, interior designers, and civil engineers which were lack of adequate research on the development of sustainable construction materials, economic constraints, and lack of skilled labourers for construction with vernacular or traditional construction materials. The findings of the study can be used for comprehension and implications for sustainable construction materials usage. In the present scenario, the findings of the study are important as sustainable construction materials are the need of the hour owing to severe climate damage and for resolving unmet challenges of urbanization.
Imparting concepts of sustainability and green buildings via a case study on an educational building
Authors: Kona Mahesh , Pamu Yashwanth , Bommisetty Jagadeesh , Samarthi Praveen 
Published: November 2024

Abstract
Sustainable building construction is the need of the hour for any developing nation. Sustainable or Green buildings mainly focus on the conservation of energy, water, and other scarce resources. Indian Green Buildings Council (IGBC) and Green Rating for Integrated Habitat Assessment (GRIHA) are two organizations in India which certifies buildings of various categories based on the sustainable practices adopted in the buildings. Certification is given for existing as well as new buildings. This paper attempts to evaluate the sustainable features of an existing school as per IGBC standards. The study revealed that the school under consideration has few sustainable features. Very few points were scored in the most important criteria i.e., water efficiency and energy efficiency, which contributes to more than 50% of the total points. The existing school building can be converted into a green building with certain modifications to the existing school infrastructure. This detailed study on various existing features of the building will help the school authorities to improve the building for a sustainable environment to the school students.
Groundwater remediation techniques around Kodungaiyur dump yard
Authors: Aishwarya R. , Hemamathi A. , Sukumar Binu , Yuvaraj M. 
Published: November 2024

Abstract
The groundwater around the Kodungaiyur dump yard, in Tamil Nadu, India, is polluted due to the percolation of leachate from the dumpsite. This paper proposes three remedial techniques to make the groundwater drinkable for the people living near the Kodungaiyur trash yard. Twelve bore wells around the Kodungaiyur dumpsite provided water samples for which the physicochemical parameters were measured. Moderately high concentrations of Total Hardness (TH), Total Alkalinity (TA), Chloride, Sulphate, Nitrate, Sodium, and Total Dissolved Solids (TDS) are present in the groundwater around the dump yard. The Physicochemical parameters of the samples tend to deviate from the standards prescribed by WHO and BIS. Therefore, remedial measures such as solar distillation, Activated Charcoal, and the Phytoremediation process are suggested to reduce the contaminants in the groundwater. The activated charcoal removes the unpleasant color of the water completely and makes the water clear and transparent through filtration. The solar distillation process does not affect the pH value and is reduced by 4.5% in the phytoremediation technique. Similarly, the level of chlorides is reduced by 99% in solar distillation and by 56% in the phytoremediation technique. Total hardness is reduced by 89.88% in the solar still process and 56.65% in the phytoremediation technique. Sodium is reduced by 99.88% in solar still and 57.03% in the phytoremediation technique. The economical and eco-friendly nature of the suggested techniques makes it sustainable for future generations.