Suggested Topics within your search.
Suggested Topics within your search.
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1621
Characterization of hydrogeological units and hydrodynamics of a section of the aquifer system in the city of Cartago, Costa Rica
Published 2025-01-01“…The results revealed that the aquifer system consists of a variety of materials, predominantly alluvial and laharic deposits, which function as aquifer hydrogeological units. These materials contain interspersed clay lenses, fine sands, and coarse sands, which collectively influence the formation of saturated zones, aquitards, and aquicludes. …”
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1622
Comparing Reflectivity from Space-Based and Ground-Based Radars During Detection of Rainbands in Two Tropical Cyclones
Published 2025-03-01“…This study utilizes the Dual-frequency Precipitation Radar (DPR) from the Global Precipitation Measurement Mission (GPM) satellite to evaluate reflectivity obtained using four sampling methods of Weather Surveillance Radar 1988-Doppler data, including ground radars (GRs) in the GPM ground validation network and three mosaics, specifically the Multi-Radar/Multi-Sensor System plus two we created by retaining the maximum value in each grid cell (MAX) and using a distance-weighted function (DW). We analyzed Hurricane Laura (2020), with a strong gradient in tangential winds, and Tropical Storm Isaias (2020), where more stratiform precipitation was present. …”
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1623
See-Then-Grasp: Object Full 3D Reconstruction via Two-Stage Active Robotic Reconstruction Using Single Manipulator
Published 2024-12-01“…Our method optimizes the camera pose based on an uncertainty function, allowing it to identify the most uncertain regions in a short time. …”
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1624
Deep crypt secretory cells shape region-specific mucin glycosylation patterns in the mouse colon.
Published 2025-01-01“…Its region-specific glycosylation patterns are indispensable for adapting to distinct physiological and microbial environments along the colon, thus ensuring appropriate mucin layer function. However, the mechanisms underlying this region-specific glycosylation remain unknown. …”
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1625
Residual-Based Implicit Neural Representation for Synthetic Aperture Radar Images
Published 2024-11-01“…Image INRs utilize a neural network to learn a continuous function that takes pixel coordinates as input and outputs the corresponding pixel values. …”
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1626
Linear perturbations of the Bloch type of space-periodic magnetohydrodynamic steady states. I. Mathematical preliminaries
Published 2023-07-01“…The three-dimensional space, where q resides, splits into a number of regions, inside which the growth rate is a smooth function of q. In preparation for a numerical study of the dominant (i.e., the largest over q) growth rates, we have derived expressions for the gradient of the growth rate in q and proven that, for parity-invariant flows and MHD steady states or when the respective eigenvalue of the stability operator is real, half-integer q (whose all components are integer or half-integer) are stationary points of the growth rate. …”
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1627
On Explainability of Reinforcement Learning-Based Machine Learning Agents Trained with Proximal Policy Optimization That Utilizes Visual Sensor Data
Published 2025-01-01“…Our approach is based on the solid theoretical foundation of Gradient-weighted Class Activation Mapping (GradCAM) and Classification and Regression Tree with additional proxy geometry heuristics. …”
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1628
Improved Aerial Surface Floating Object Detection and Classification Recognition Algorithm Based on YOLOv8n
Published 2025-03-01“…The proposed algorithm introduces several key enhancements: (1) an enhanced HorBlock module to facilitate multi-gradient and multi-scale superposition, thereby intensifying critical floating object characteristics; (2) an optimized CBAM attention mechanism to mitigate background noise interference and substantially elevate detection accuracy; (3) the incorporation of a minor target recognition layer to augment the model’s capacity to discern floating objects of differing dimensions across various environments; and (4) the implementation of the WIoU loss function to enhance the model’s convergence rate and regression accuracy. …”
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1629
YOLO-MARS: An Enhanced YOLOv8n for Small Object Detection in UAV Aerial Imagery
Published 2025-04-01“…Finally, a dynamic WIoU evaluation function is implemented, constructing adaptive penalty terms based on the spatial distribution characteristics of predicted and ground-truth bounding boxes, thereby optimizing the boundary localization accuracy of densely packed small targets from the UAV viewpoint. …”
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1630
Optimizing Artificial Neural Network Learning Using Improved Reinforcement Learning in Artificial Bee Colony Algorithm
Published 2024-01-01“…Heuristic search optimization methods are typically used to minimize the loss function in ANNs. However, these methods can lead the network to become stuck in local optima, limiting performance. …”
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1631
Linearized MILP Model With Improved Soft Actor-Critic Algorithm for Dynamic and Efficient Active Distribution Network Planning
Published 2025-01-01“…Then, by analyzing the distributed network planning objective function and constraints, a mixed integer linear planning (MILP) model for distributed networks is proposed. …”
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1632
Study of chemical properties of hybrid nanofluid flow between two permeable disks with suspension of carbon nanotubes using Yamada Ota and Xue models
Published 2025-03-01“…Analytical solutions for both accelerating and decelerating velocities are derived using the Jacobi elliptic sine-squared function. The velocity profiles follow a plane-Poiseuille parabolic law at low Reynolds numbers. …”
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1633
A Novel Dynamic Lane-Changing Trajectory Planning Model for Automated Vehicles Based on Reinforcement Learning
Published 2022-01-01“…To optimize its performance, a reward function is properly designed by combining safety, efficiency, gap, headway, and comfort features. …”
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1634
DMN-YOLO: A Robust YOLOv11 Model for Detecting Apple Leaf Diseases in Complex Field Conditions
Published 2025-05-01“…Additionally, a normalized Wasserstein distance (NWD) loss function is introduced to mitigate localization errors, particularly for small or overlapping lesions. …”
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1635
Salinity Profiles in Coastal Aquifers: A Characterization Framework for Field Measurements
Published 2024-06-01“…The adopted fitting function showed an excellent match (mean R2 = 0.99). …”
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1636
GENERAL EQUATION OF THE HYDRAULIC FRICTION LAW FOR HINDERED FALLING OF AN INDIVIDUAL BALL AND FLUID MOTION IN GRANULAR LAYERS
Published 2015-06-01“…At present, the basis for calculating techniques is the monomial Darcy formula defining the filtering rate as function of the hydraulic gradient with bringing in the filtration coefficient. …”
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1637
Predicting filtration coefficient and formation damage coefficient for particle flow in porous media using machine learning
Published 2025-03-01“…An equation was formulated to estimate λ as a function of these three features. A direct prediction of β using these features was established by applying the XGBoost model to predict γ and then employing an existing power law relationship between β and γ. …”
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1638
Identification of Cultural Landscapes and Spatial Distribution Characteristics in Traditional Villages of Three Gorges Reservoir Area
Published 2025-07-01“…Through field surveys, landscape feature assessments, GIS spatial analysis, and multi-source data analysis, we systematically analyse their cultural landscape type systems and spatial differentiation characteristics, and then reveal their cultural landscape types and spatial differentiation patterns. (1) The results of the study show that the spatial distribution of traditional villages exhibits significant altitude gradient differentiation—the low-altitude area is dominated by traffic and trade villages, the middle-altitude area is dominated by patriarchal manor villages and mountain farming villages, and the high-altitude area is dominated by ethno-cultural and ecologically dependent villages. (2) Slope and direction analyses further reveal that the gently sloping areas are conducive to the development of commercial and agricultural settlements, while the steeply sloping areas strengthen the function of ethnic and cultural defence. …”
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1639
Optimizing Power Consumption in Aquaculture Cooling Systems: A Bayesian Optimization and XGBoost Approach Under Limited Data
Published 2025-06-01“…Based on this model, Bayesian Optimization with the Lower Confidence Bound (LCB) acquisition function is used to determine the optimal discharge temperature of water into breeding pools, minimizing day-ahead electricity costs. …”
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1640
Mathematical model of data collection and processing for a recommendation system for forming an individualized educational program
Published 2025-07-01“…In the current implementation, ML.NET tools are used, which automate the process of matrix factorization and loss function minimization, simplifying the development and tuning of the model. …”
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