Preprints
There are 6976 Preprints listed.
DHAFGan: A Dense Hybrid Attention Fusion Generative Adversarial Network for Infrared and Visible Image Fusion
Published: 2026-03-22
Subjects: Computer Engineering
Aiming at the problems existing in the current infrared and visible light image fusion algorithms, such as insufficient perception of typical features, poor visual representation of the fusion results, and insufficient utilization of important secondary information, this paper proposes an infrared and visible light image fusion algorithm based on shallow-deep feature extraction and dual-channel [...]
A Domain-Based Evolution Model for Red Sea: New Sea-Floor Spreading Evidence
Published: 2026-02-07
Subjects: Earth Sciences
The propagation of the Red Sea continental margin remains unevaluated. Despite the unanimous agreement that the southern Red Sea axial ridge valley is underlain by juvenile oceanic crust, there is a lack of such agreement for the central and northern Red Sea. Significant issues relating to Red Sea tectonics are whether the Arabian and Nubian plates have been completely separated (i.e., oceanic [...]
Cube2sph-GPU: A GPU accelerated toolkit enabling flexible continental-scale regional and teleseismic full waveform inversion
Published: 2026-03-04
Subjects: Geophysics and Seismology, Physical Sciences and Mathematics
We present Cube2sph-GPU, a GPU-accelerated framework for continental-scale regional and teleseismic full-waveform inversion (FWI). Building upon the capabilities of SPECFEM3D_Cartesian, the toolkit introduces: (1) a flexible hybrid simulation scheme for tele-seismic simulations; (2) curvilinear C-PML; (3) spherical PDE-based kernel smoothing; and (4) highly optimized GPU kernels and I/O [...]
Accelerating 3D Magnetotelluric Forward Modelling with Domain Decomposition and Order-Reduction Methods
Published: 2026-02-07
Subjects: Applied Mathematics, Geophysics and Seismology
Three-dimensional (3D) magnetotelluric (MT) forward modelling is computationally demanding, limiting its use in global uncertainty quantification and sampling-based probabilistic inversion. Here, we introduce a novel forward-modelling framework that combines an iterative domain decomposition (DD) formulation with proper orthogonal decomposition (POD) reduced-order modelling to enable scalable and [...]
Multiple-Well Monitoring Site Adjacent to the Midway- Sunset and Buena Vista Oil Fields, Kern County, California
Published: 2026-02-13
Subjects: Earth Sciences, Geochemistry, Geology, Hydrology, Physical Sciences and Mathematics
Groundwater quality in and around oil fields in the Southern San Joaquin Valley is of interest to many California residents that rely heavily on groundwater for domestic, commercial, and agricultural use. To help assess the effects of historical oil-field activities and natural geologic sources on groundwater near the southwest margins of the Kern County Groundwater Subbasin, a multiple-well [...]
Reduced-order modelling of Cascadia’s slow slip cycles
Published: 2025-07-25
Subjects: Computer Sciences, Earth Sciences, Numerical Analysis and Scientific Computing, Physical Sciences and Mathematics
Slow-slip events (SSEs) modulate the earthquake cycle in subduction zones, yet understanding their physics remains challenging due to sparse observations and high computational cost of physics-based simulations. We present a scientific machine-learning approach using a data-driven reduced-order modelling (ROM) framework to efficiently simulate the SSE cycle governed by rate-and-state friction in [...]
Petrogenic Carbon Oxidation and Its Impact on the Carbon Balance in the Ganga River Basin
Published: 2026-05-16
Subjects: Earth Sciences
Based on sampling and investigation spanning several years, we conduct a comprehensive assessment of petrogenic organic carbon (OCpetro) oxidation and evaluate the net carbon budget in the Ganga–Hooghly River (GHR) basin, extending from the Himalayan mountainous catchments to the floodplains in India. Our multi-proxy approach combines data on rhenium (Re) concentrations, radiocarbon (pMC), stable [...]
Escape of near-inertial waves trapped in strong fronts through wave-wave interactions
Published: 2026-02-10
Subjects: Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Research on marine litter detection based on CNN-Transformer heterogeneous parallelism
Published: 2026-03-27
Subjects: Electrical and Computer Engineering
Aiming at strong background interference and low detection accuracy of small/deformed targets in marine debris detection, this paper develops a high-precision lightweight intelligent detection and recognition system. A multi-scenario dataset is built and data augmentation is used to tackle sample scarcity and domain shift; a CNN-Transformer heterogeneous parallel model YOLO-Trans is designed on [...]
Analysis of Orbit Determination Error Impact on Clutter Doppler Frequency for Space-Based Early Warning Radar
Published: 2026-04-03
Subjects: Aerospace Engineering
The accuracy of clutter Doppler frequency in space-based early warning radar (SBR) directly determines moving target detection performance, and satellite orbit determi-nation error is a important cause of clutter Doppler deviation. Taking satellite position and velocity in the Geocentric Celestial Reference System (GCRS) as core variables, this paper derives the analytical expression of clutter [...]
Paleomagnetic data from the Qaidam Block quantify post-middle Triassic convergence preceding eastern Eurasian assembly
Published: 2026-04-09
Subjects: Geology
Amalgamation of East Asian blocks with Eurasia involved progressive closure of several oceanic basins preserved as sutures. Since the Permian, the North China Block has undergone ~2500 km of paleolatitudinal motion relative to Eurasia, forming Mongol–Okhotsk suture in the north. Surprisingly, no evidence in its western part has been found to coordinate this motion, which is essential for a triple [...]
A Novel Climatic Threat Framework Linking Biodiversity’s Vulnerability to Administrative Responsibility
Published: 2026-02-07
Subjects: Life Sciences
Biodiversity is cornered by human habitat alteration and eroded by climate change. Protecting it urgently requires efficient allocation of conservation resources to protect vulnerable species and ecosystems. However, conservation decisions are often hindered by fragmented governance and a disconnection between policymakers, funders, managers and scientists. To address this, we propose the [...]
Harnessing naturally occurring sodium carbonate and bicarbonate for gigatonne-scale carbon dioxide removal
Published: 2026-03-06
Subjects: Engineering
Ocean alkalinity enhancement is a promising carbon dioxide removal (CDR) approach, but scaling up to gigatonnes (Gt) of CO2 per year will require safe, sustainable, and abundant alkaline feedstocks. Here, we propose the use of a relatively unexplored resource for OAE, namely naturally occurring sodium (bi)carbonates. We identified and mapped 109 such deposits globally, although quantitative [...]
Mathematical Modeling of Coupled Heat and Mass Transfer with Phase Transitions in Heterogeneous Porous Soils: Mechanism of Soil Moisture Diffusivity Collapse during Freezing
Published: 2026-03-12
Subjects: Physical Sciences and Mathematics
A mathematical model of coupled heat and mass transfer with water–ice–vapor phase transitions in heterogeneous porous soils is developed. The model comprises the Richards equation, the water vapor diffusion equation, and the heat transfer equation, coupled through a temperature-dependent hydraulic conductivity governed by the Kozeny–Carman relation and thermodynamic phase equilibrium described by [...]
Diurnal asymmetry in heat stress intensification across Bangladesh, 1985–2024: Accelerated nighttime warming and emerging urban risk
Published: 2026-02-07
Subjects: Risk Analysis
Bangladesh’s rapidly growing cities are becoming hotter, but how heat stress is changing over the day–night cycle has remained unclear. Using 40 years (1985–2024) of hourly Universal Thermal Climate Index (UTCI) data from ERA5-HEAT, we examined long-term changes in physiologically relevant heat stress across Bangladesh and its major cities. Results show a clear day–night imbalance in warming: [...]