2,915 research outputs found
In an Attempt to Introduce Long-range Interactions into Small-world Networks
Distinguishing the long-range bonds with the regular ones, the critical
temperature of the spin-lattice Guassian model built on two typical Small-world
Networks (SWNs) is studied. The results show much difference from the classical
case, and thus may induce some more accurate discussion on the critical
properties of the spin-lattice systems combined with the SWNs.Comment: 4 pages, 3 figures, 18 referenc
A new error correction method for the stationary Navier-Stokes equations based on two local Gauss integrations
summary:A new error correction method for the stationary Navier-Stokes equations based on two local Gauss integrations is presented. Applying the orthogonal projection technique, we introduce two local Gauss integrations as a stabilizing term in the error correction method, and derive a new error correction method. In both the coarse solution computation step and the error computation step, a locally stabilizing term based on two local Gauss integrations is introduced. The stability and convergence of the new error correction algorithm are established. Numerical examples are also presented to verify the theoretical analysis and demonstrate the efficiency of the proposed method
Intelligent model for offshore China sea fog forecasting
Accurate and timely prediction of sea fog is very important for effectively
managing maritime and coastal economic activities. Given the intricate nature
and inherent variability of sea fog, traditional numerical and statistical
forecasting methods are often proven inadequate. This study aims to develop an
advanced sea fog forecasting method embedded in a numerical weather prediction
model using the Yangtze River Estuary (YRE) coastal area as a case study. Prior
to training our machine learning model, we employ a time-lagged correlation
analysis technique to identify key predictors and decipher the underlying
mechanisms driving sea fog occurrence. In addition, we implement ensemble
learning and a focal loss function to address the issue of imbalanced data,
thereby enhancing the predictive ability of our model. To verify the accuracy
of our method, we evaluate its performance using a comprehensive dataset
spanning one year, which encompasses both weather station observations and
historical forecasts. Remarkably, our machine learning-based approach surpasses
the predictive performance of two conventional methods, the weather research
and forecasting nonhydrostatic mesoscale model (WRF-NMM) and the algorithm
developed by the National Oceanic and Atmospheric Administration (NOAA)
Forecast Systems Laboratory (FSL). Specifically, in regard to predicting sea
fog with a visibility of less than or equal to 1 km with a lead time of 60
hours, our methodology achieves superior results by increasing the probability
of detection (POD) while simultaneously reducing the false alarm ratio (FAR).Comment: 19 pages, 9 figure
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