bluuebunny/crossref_metadata_2025_split huggingface dataset:
An exactly solvable model for non-Fickian transport in dynamically heterogeneous media
Authors: Kim Ji-Hyun 
Published: October 2024

Abstract
Diffusion, observed in various condensed phases, finds its theoretical background in Einstein’s theory of Brownian motion, characterized by the linear time-dependence of mean square displacement (MSD) denoting Fickian behavior and the Gaussian distribution of particle displacement. Nevertheless, diverse systems exhibit either non-linear, non-Fickian time-dependence of the MSD or non-Gaussian displacement distribution. Montroll and Weiss’s continuous-time random walk (CTRW) model and the stochastic diffusivity (SD) model have provided insights into anomalous diffusion phenomena and Fickian-yet-non-Gaussian transport in dynamically heterogeneous environments, respectively. Building upon these approaches, Song et al developed a generalized transport equation with an environment-dependent diffusion kernel, providing a quantitative explanation for non-Fickian MSD and non-Gaussian displacement distribution. Based on the generalized transport equation, this study introduces an exactly solvable model for a non-Gaussian displacement distribution, accommodating arbitrary time profiles in its MSD, including both Fickian and non-Fickian behaviors. Our findings confirm the model’s capability in describing such transport processes. Furthermore, the proposed model unifies the CTRW model under fast environmental fluctuations and the SD model under Fickian time dependencies, making it suitable for understanding tracer particle motion within explicit solvent or complex media.
Generalized hydrodynamics and approach to generalized Gibbs equilibrium for a classical harmonic chain
Authors: Pandey Saurav , Dhar Abhishek , Kundu Anupam 
Published: October 2024

Abstract
We study the evolution of a classical harmonic chain with nearest-neighbor interactions starting from domain wall initial conditions. The initial state is taken to be either a product of two Gibbs ensembles (GEs) with unequal temperatures on the two halves of the chain or a product of two generalized Gibbs ensembles (GGEs) with different parameters in the two halves. For this system, we construct the Wigner function and demonstrate that its evolution defines the generalized hydrodynamics (GHD) describing the evolution of the conserved quantities. We solve the GHD for both finite and infinite chains and compute the evolution of conserved densities and currents. For a finite chain with fixed boundaries, we show that these quantities relax as

∼

1

/

t

to their respective steady-state values given by the final expected GE or GGE state, depending on the initial conditions. Exact expressions for the Lagrange multipliers of the final expected GGE state are obtained in terms of the steady-state densities. In the case of an infinite chain, we find that the conserved densities and currents at any finite time exhibit ballistic scaling while, at infinite time, any finite segment of the system can be described by a current-carrying non-equilibrium steady state (NESS). We compute the scaling functions analytically and show that the relaxation to the NESS occurs as

∼

1

/

t

for the densities and as

∼

1

/

t
2

for the currents. We compare the analytical results from hydrodynamics with those from exact microscopic numerics and find excellent agreement.
Analysis of cooperative cooling performance between the battery and cabin of pure electric vehicles
Authors: Tang Rongjiang , Guan Lei , Xu Chen , Shi Fangjian , Lu ZengJun , Nong Donghua 
Published: October 2024

Abstract
The cooperative cooling of the cabin and battery in pure electric vehicles (PEVs) is crucial for the comfort, thermal safety of the occupants, and the lifespan of the batteries. Therefore, a well-designed thermal management system (TMS) is particularly important. Thus, this paper constructs an cooperative cooling for the battery pack circuit and the cabin circuit in parallel, aiming to enhance the vehicle system’s integration and reduce energy consumption. Firstly, a one-dimensional simulation model of the cooperative TMS is established, and the model is calibrated through experiments. Subsequently, the system’s performance is analyzed under different ambient temperatures. The study finds that as the ambient temperature increases, the system’s energy consumption rises, and the Coefficient of Performance (COP) decreases. Moreover, when the system switches from the simultaneous cooling mode of the cabin and battery to the sole cooling mode of the cabin, the temperature of the cabin will fluctuate to a certain extent, within a range of 2°C. At same time, the COP value also increases with the switch of the mode. Finally, the analysis of the simultaneous cooling mode of the cabin and battery side under different ambient temperatures reveals that as the ambient temperature increases from 34°C to 42°C, the exhaust temperature, pressure ratio, and compressor speed increase accordingly, while the compressor efficiency decreases. The condenser and chiller experience a reduction in their heat transfer efficiency by 59.4 watts per degree Celsius and 218.5 watts per degree Celsius, respectively. Conversely, the evaporator’s heat transfer efficiency undergoes an enhancement of 6.77 watts per degree Celsius.
Analysis and research on the hydrodynamic performance of offshore floating photovoltaic systems under large tidal variations
Authors: Gao Xubing , Guo Jianting 
Published: October 2024

Abstract
This paper focuses on the multi-module connected offshore floating photovoltaic system, designing a mooring system with buoys, considering the effects of buoy size, position on the motion response of the photovoltaic system, mooring cable tension, and photovoltaic air gap. Based on the three-dimensional potential flow theory, optimal parameters for buoys were selected using regular waves at an average depth of 10 meters. Subsequently, factors such as tidal differences, randomness of waves, wind, and currents were taken into account, and the motion response, mooring tension, and photovoltaic air gap were calculated separately at water depths of 8 m, 10 m, and 12 m. The analysis results indicate that the offshore floating photovoltaic system with a buoy mooring system, under the influence of tidal differences, does not show significant differences in the minimum air-gap height of the photovoltaic system, ensuring safe and stable operation.
Flood simulation and impact analysis of Xun River under backwater condition
Authors: Liu Guoyin , Wu Xianmin , Zhang Xueyi , Li Dongyun 
Published: October 2024

Abstract
The intersection of river channels is easy to cause the backside of the main flow, which greatly influences the change of hydrological conditions of river channels. To study the changing characteristics of river flood under the condition of uplift, a one-dimensional hydrodynamic model was established to simulate the evolution process of river flood under the condition of seeking river uplift. Factors such as distance, height, flood speed, inundation area, inundation depth, and flood speed were selected to analyze the changing rules of the influence of river bullying. The results show that the influence degree of the river following is closely related to the size of the flood. Under the same earthquake magnitude, the backwater distance, backwater height, inundation area, inundation depth, and inundation speed of sub-river flood increase with the increase of flood magnitude, while the flood speed decreases. When the magnitude of the flood is once in 200 years, the flood elements reach the maximum, the reflux distance is 8, 368 m, the reflux height is 3.2 m, and the velocity is reduced by 43.2%. This study can provide relevant data for the flood control work in the Sun River basin and provide a reference for the scheme design of tributary interchanges.
Study on hydrodynamics of fish school based on SPH simulation
Authors: Wang Xuejian 
Published: October 2024

Abstract
In this paper, the effect of spatial configurations on the hydrodynamic characteristics of fish is investigated numerically using the δ+-SPH model. The spatial configurations include side-by-side and triangular. The fluid field, including the pressure field and velocity field, are obtained by SPH simulation. The results show that the SPH method can well simulate the self-propelled movement of fish. Under the viscous flow waters, the side-by-side fish will be close to each other due to the Bernoulli effect. For triangular configurations, fish will tend to form inverted triangular configurations due to passage effects, which accompany the changes in the cost of transportation.
Non-uniform maldistribution of boiling flow in two parallel microchannels with entry effects
Authors: Chen Xiaoyi , Wang Youtong , Li Haidong , Jiang Jieyan , Pan Zhenhai 
Published: October 2024

Abstract
Current theoretical studies of parallel channel instability are restricted to the full development assumption, and the entry effect of the existing developmental stage in miniaturized heat dissipation scenarios is not taken into consideration, leading to some deviations in the predicted results of the stability in practical applications. Using a kinetic model of phase transition and pressure drop, we study microchannels with an L/D ratio of 50 and a hydraulic diameter of 200 μm. The significant influence of the entry effect during both the development and fully developed stages is revealed by our results, which demonstrates a narrowing of the overall flow discrepancy and, consequently, an enhancement in the system’s stability. Particularly, the mitigating effect of the entry effect on the flow instability and maldistribution within the parallel channels was gradually enhanced when the qin increased from 20 W/cm2 to 100 W/cm2.
Study on the diffusion and blocking behavior of bubble plumes in Cross-Flow
Authors: Fan Kai , Meng Cheng , Wei Wei , Wang Enwei 
Published: October 2024

Abstract
With the deepening of the concept of environmental protection, environmental problems in dredging engineering have attracted more and more attention. The diffusion of suspended particulate matter is inevitable in the process of dredging. A bubble plume, as a multiphase linear plume, has been widely studied because it can block the diffusion of suspended particulate matter in water. To explore the formation characteristics of the bubble plume, we evaluate the formation quality of the bubble plume qualitatively and quantitatively, analyze the effect of the bubble plume on blocking the diffusion of suspended particulates under different operating conditions (the type of bubble plume generation device, the number of bubble plume rows, and the ventilation flow rate) and environmental conditions (water flow velocity), and study the movement trajectory of blocked particles and blocked failed particles. A series of experiments on bubble plume characteristics and bubble plume blocking the diffusion of suspended particles were conducted to analyze the particle distribution characteristics and bubble plume blocking effect under the interaction of transverse flow and bubble plume. The results show that the better the quality of the bubble plume is, the lower the transverse flow intensity is, and the better the barrier effect of the bubble plume is.
Design of motion control system for unmanned wheeled electric vehicle
Authors: Wang Zhihui , Xu Hongxin , Zhang Xuejie , Xie Wen 
Published: October 2024

Abstract
The unmanned wheeled electric vehicle is a weapon platform that draws significant attention in current and future battlefields, and research on its motion control is fundamental. This paper introduces the design of a 6×6 unmanned wheeled electric vehicle and discusses the motion control methods applicable to this vehicle. The electric drive system of this vehicle comprises six independent asynchronous motors and corresponding motor controllers. A comprehensive controller designed based on DSP connects the six motor controllers. As it is an experimental platform, the motion control algorithms are deployed on an onboard computer, which connects to the comprehensive controller. Using the Backstepping method, the kinematic control algorithm for the 6×6 unmanned wheeled electric vehicle is designed. The global asymptotic stability of the control system is proven through the Lyapunov function, and its control performance is verified via simulation experiments. Finally, the system is deployed and tested on the actual vehicle. Experimental results show that the motion control system designed in this paper enables the unmanned wheeled electric vehicle to achieve effective motion control. The control laws derived from the Backstepping method are relatively simple and have low requirements for the sampling period. In practical systems, output speed magnitude and rate of change must be limited to stay within allowable system parameters.
Predicting landslide extent of satellite images based on image classification extraction
Authors: Chiu Chen-Yuan , Hsu Sung-Chi , Huang Yishuo , Zhang Nan , Peng Chen 
Published: October 2024

Abstract
Landslide is a common geological disaster and the most destructive natural disaster at home and abroad. Therefore, automatic interpretation of landslide high-risk areas and potential landslide areas through different models and methods is one of the basic ways to prevent and reduce possible disasters. In this study, we improve the NDWI method by using the multispectral image data from the French satellite SPOT 5. Combined with infrared band sensors, the Normalized Difference Water Index (NDWI) of large exposed landslides is extracted by improving the NDWI index method by utilizing the characteristics of near-infrared (NIR) and short-wave infrared (SWIR) bands and replacing the green-wave band or the mid-infrared (MIR) band with the short-wave infrared (SWIR) band, which can be applied to the water resources management of high-risk areas, potential landslide areas, and potential landslide areas, and the water environment monitoring of water resources and disaster emergency management. We calculate the 2014 satellite images with a total area of 11351.6 ha, and after the NDWI index, the dark blue color represents the high-risk landslide area of 1609.1 ha (14175%), the light blue color represents the potential landslide area of 3971.773 ha (34.989%), and the brown color represents the vegetation area of 5770.727 ha (50.836%).
Assessing the design of integrated methane sensing networks
Authors: Patel Lekha , Zenker Jake P 
Published: October 2024

Abstract
While methane is the second largest contributor to global warming after carbon dioxide, it has a larger warming effect over a much shorter lifetime. Despite accelerated technological efforts to radically reduce global carbon dioxide emissions, rapid reductions in methane emissions are needed to limit near-term warming. Being primarily emitted as a byproduct from agricultural activities and energy extraction, methane is currently monitored via bottom–up (i.e. activity level) or top–down (via airborne or satellite retrievals) approaches. However, significant methane leaks remain undetected and emission rates are challenging to characterize with current monitoring frameworks. In this paper, we study the design of a layered monitoring approach that combines bottom–up and top–down approaches as an integrated sensing network. By recognizing that varying meteorological conditions and emission rates impact the efficacy of bottom–up monitoring, we develop a probabilistic approach to optimal sensor placement in its bottom–up network. Subsequently, we derive an inverse Bayesian framework to quantify the improvement that a design-optimized integrated framework has on emission-rate quantifications and their uncertainties. We find that under realistic meteorological conditions, the overall error in estimating the true emission rates is approximately 1.3 times higher, with their uncertainties being approximately 2.4 times higher, when using a randomized network over an optimized network, highlighting the importance of optimizing the design of integrated methane sensing networks. Further, we find that optimized networks can improve scenario coverage fractions by more than a factor of 2 over experimentally-studied networks, and identify a budget threshold beyond which the rate of optimized-network coverage improvement exhibits diminishing returns, suggesting that strategic sensor placement is also crucial for maximizing network efficiency.
Thermal Performance of Becool-Roof Coating in Reducing Heat Gain on Fisherman’s Settlement of Gorontalo City
Authors: Djafar A G , Pratiwi N , Rahmayanti  , Mutmainnah N , Kaharu A 
Published: October 2024

Abstract
Tanjung Kramat in Gorontalo, Indonesia is a village fostered by the department of Architecture, Universitas Negeri Gorontalo. The village is home to around two hundred families whose majority job is fishing. The people suffer from the uncomfortable condition of tropical coastal environment due to the high air temperature, humidity, and wind speed. Not to mention people in Gorontalo prefer to cover their upper structure using metal zincalume roof since they are more affordable. The highly thermal conductivity roof accounts for excessive heat gain to the house. Through a CSR program by Becool, the villagers received Cool Roof Coating to reduce heating and mitigate global warming. Before and after painting measurements of roof surface temperatures, radiant temperatures, and ground air temperatures are conducted. After the application of the coating, the analysis shows a positive result as the roof surface temperature is reduced by about 20ºC, followed by an improvement in ground air temperature by an average of 0.8ºC. The cool roof coating has succeeded in improving the neighborhood of Tanjung Kramat village.
Identification of Urban Heat Island Potency in Janten Village area due to Aerotropolis Development
Authors: Putra Patric Chrisna Yuansha , Binarti Floriberta 
Published: October 2024

Abstract
Special Region Yogyakarta Province experiences an increase in heat every year based on land surface temperature data in each region. This increase in heat is caused by the decreasing function of green land in rural areas over time, so that the land surface experiences increased exposure to sunlight due to reduced radiation barriers and heat absorption, and has the potential to give rise to an Urban Heat Island. The decline in rural areas as green areas is due to industrial development, one of which is the planning of the Aerotropolis area in Janten Village, Wates Regency, Kulon Progo, Yogyakarta. Aerotropolis is a regional development concept that makes airports the center of the economy, mobilization, transportation, and industry. This paper aims to analyze the magnitude of the potential arising from Land Use-Land Change (LULC) due to the Aerotropolis planning concept in Janten Village. The main data collection was carried out through direct measurements in the field using a Micro Weather Station (MWS) as a recorder of climate conditions and a thermal flir camera to capture surface temperatures. The data taken will be processed using experimental methods using the ENVI-Met application according to modeling of the existing conditions and microclimate of Janten Village.
Comparative Analysis of the Distribution of Natural Lighting with Artificial Lighting in Auditorium at Indonesia University of Education, at Faculty of Mathematics and Natural Sciences Building
Authors: Maharani Shofia Anindita , Budiman Nindita Arta , Komala Dewi Nitih Indra 
Published: October 2024

Abstract
This article provides an indepth analysis of the lighting conditions in the auditorium at the Indonesia University of Education, specifically within the Faculty of Mathematics and Natural Sciences. The study aims to assess the effectiveness of both natural light from windows and artificial light from lamps in accommodating large gatherings of up to 300 people. Using AutoCAD and DIALux, we conduct a simulation experiment to visualize the lighting system, considering factors such as the distribution of natural light and the impact of artificial lighting. Our methodology involves specific parameters for data analysis to ensure a comprehensive evaluation. While observing the auditorium, we note potential challenges, such as the limited impact of natural light. This finding raises questions about the need for adjustments to the architectural design or the inclusion of additional natural light sources. Conversely, the artificial lighting appears to be abundant and sufficient for illuminating the entire space. Considering the broader implications, the study addresses the significance of optimizing lighting conditions in auditoriums for improved user experience and potential energy efficiency. The findings contribute to the ongoing discourse on effective lighting design in educational spaces. This research is not without limitations, and future work could explore more nuanced aspects of lighting design or investigate the feasibility of implementing sustainable lighting solutions. In conclusion, this study offers valuable insights into auditorium lighting, guiding future research and practical interventions for enhanced lighting conditions in similar settings.
Secondary Skin Facade for Urban Noise Reduction: A Case Study of Bandung Creative Hub Co-working Space
Authors: Aziz Muhamad Abdul , Ramadhan Try 
Published: October 2024

Abstract
In recent years, the proliferation of co-working spaces has offered a collaborative environment for entrepreneurs, freelancers, and small businesses in urban areas. However, the issue of environmental noise within these spaces presents a challenge to comfort and productivity. This study focuses on the Bandung Creative Hub (BCH), a prominent co-working space in Bandung, Indonesia, and investigates the efficacy of facade engineering solutions, particularly the installation of secondary skin, in mitigating urban noise pollution. Through a comprehensive analysis utilizing both empirical measurements and computational simulations, the study aims to understand the intricacies of noise dynamics within the BCH co-working space. Empirical measurements using the Noise Tool software capture ambient noise levels, while computational simulations with IBANA provide predictive modeling of acoustic conditions. The results reveal a significant reduction in noise levels, with the sound level around the workspace corridor decreasing by approximately 23.3%, from 62 dB to 47 dB, indicating the effectiveness of facade engineering interventions. The limitations of prior research, which concentrated solely on barrier intervention methods and spacing ratio. Nevertheless, this study introduces a fresh perspective by examining the efficacy of secondary skin facade engineering in achieving noise standards and enhancing the quality of urban environments.