Article
Chemistry, Multidisciplinary
Antonio Gamba, Jean-Marc Franssen
Summary: Recent studies have shown that fires in large compartments tend to burn locally and move over time, challenging the assumption of uniform gas temperature in fire compartments; various models have been proposed to describe the evolution of travelling fires, with a numerical model based on an improved zone model and cellular automata model.
APPLIED SCIENCES-BASEL
(2021)
Article
Automation & Control Systems
Qianqian Sun, Dejun Tan, Shuwen Zhang
Summary: In this study, the impacts of Gaussian white noise and semi-Markovian switching on the propagation dynamics of COVID-19 were investigated using a stochastic SIQR model. It was found that the fate of COVID-19 is determined by the basic reproduction number R0, and the effect of quarantine rate on R0 is more significant than transmission rate. The presence of Gaussian white noise reduces R0 but poses challenges for prediction and control, and the conditional holding time distribution significantly affects the kinetics of COVID-19. Semi-Markov switching and Gaussian white noise support irregular recurrence of COVID-19 outbreaks.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Multidisciplinary Sciences
Tahir Khan, Roman Ullah, Basem Al Alwan, Youssef El-Khatib, Gul Zaman
Summary: In this paper, a mathematical model is proposed to describe the impact of the SARS-CoV-2 virus with correlated sources of randomness and vaccination. The model takes into account the population groups and the environmental reservoir, and investigates the transmission, extinction, and persistence of the virus. The theoretical results are supported by numerical and graphical findings.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Mechanical
Cheng He, Zhonghua Li, Huan He, Jizhen Wang
Summary: A dynamic model updating approach is proposed in this study, considering thermal effects and uncertainties using a hierarchical strategy, and adjusting design parameter means and their covariance matrix based on a surrogate model. An inverse uncertainty propagation of mechanical system parameters under multiple physical fields is conducted, with thermal parameters and mechanical characteristics treated as temperature dependent.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Civil
Jeongha Park, Dongkyun Kim
Summary: In this paper, a stochastic approach is proposed to simulate realistic continuous snow depth time series using a snow depth estimation model and a stochastic weather generation model. The proposed model accurately estimates snow depth by considering precipitation type, snow ratio, and decreased snow depth. The model shows high efficiency values when applied to meteorological stations in Korea and accurately reproduces standard and extreme value statistics of observed data. This model has wide applications in snow related risk analysis, data simulation for ungauged areas, and climate projection studies.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Multidisciplinary
Yuan Li, Zhetao Zhang, Xiufeng He, Yuanlan Wen, Xinyun Cao
Summary: When using the Global Navigation Satellite System (GNSS) for positioning in challenging environments, a stochastic model that reflects reality is essential. However, existing models sometimes fail to accurately depict the actual situation of the station. In this study, a new approach is proposed to consider the impact of satellite distribution on positioning accuracy and adjust the observation weight. The results show improved accuracy and reliability of code positioning, particularly in high occlusion environments.
Article
Engineering, Civil
He-in Cheong, Zhiyu Wu, Arnab Majumdar, Washington Yotto Ochieng
Summary: This paper introduces a successful one-way coupling of CFD and crowd dynamics modeling through a new simplified methodology and its application in different geometries, highlighting the effects of smoke on crowd density profiles, leading to an elongation of overall evacuation time.
TRANSPORTATION RESEARCH RECORD
(2021)
Article
Chemistry, Physical
Jiarui Zeng, Yao Yao
Summary: Chemical systems typically exhibit strong nonlinear vibronic couplings at both zero and finite temperatures. The Davydov ansatz method, based on variational coherent states, is used to simulate quantum dynamics and spectroscopy. Two molecular systems, pyrazine and the 2-pyridone dimer, are studied as model systems, showing nontrivial quadratic vibronic couplings in different frequency regions. The method proves advantageous for nonlinear couplings, and squeezed bases are demonstrated to be applicable at finite temperatures using thermofield dynamics.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Construction & Building Technology
Xiang Wang, Zhen-yu Yin, Jun-qi Zhang, Hao Xiong, Dong Su
Summary: The study aims to generate three-dimensional models of stone-based materials with controllable stone-inclusion geometries using the SHT method and IMC algorithm. An overlapping detection algorithm is proposed to quantitatively control the geometrical features of the stones, paving the way for stochastic modeling in construction and manufacture processes.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Forestry
James M. Furlaud, Lynda D. Prior, Grant J. Williamson, David M. J. S. Bowman
Summary: Research in the Australian tall wet Eucalyptus forest found that as stand development stages change, fuel loads remain consistent while understorey moisture increases, rainforest tree abundance rises, leading to decreased fire risk and increased likelihood of high-severity fires in the early stages. Additionally, stands initiated by stand-replacing fire are more vulnerable to subsequent high-severity fires due to lack of a remaining mature canopy.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Mechanics
Dominic T. Robson, Andreas C. W. Baas, Alessia Annibale
Summary: The study introduces a mean-field framework for analyzing systems of interacting particles sharing a conserved quantity, which generalizes and unites asset-exchange and aggregation-fragmentation models. By deriving self-consistency equations and a full solution for the time evolution of moments, the model can be applied to various problems and allows for the study of systems with complex interactions.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Computer Science, Artificial Intelligence
Honggang Zhao, Guozhu Jin, Xiaolong Jiang, Mingyong Li
Summary: Generative Adversarial Networks (GANs) have been widely used in image reconstruction and editing. However, they are difficult to train and converge. To overcome this challenge, we propose a realistic image reconstruction and editing method based on Stochastic Differential Equation (SDE-RAE), which achieves high-quality image reconstruction with simple loss functions and interferes with parameter optimization using semantic enhancement.
IMAGE AND VISION COMPUTING
(2023)
Article
Physics, Multidisciplinary
Syed Yunus Ali, Nabadip Choudhury, Debasish Mondal
Summary: The continuous heating of the Earth's surface and aerosphere leads to global warming, which may increase the probability of abnormally large precipitation accumulation in rainfall events. Using a stochastic climate model, this study finds that implementing a permanent upper limit in column integrated water vapor or an asymmetric stochastic resetting can reduce the excessively high accumulation probability of such rainstorms. The presence of an optimal upper limit of column integrated water vapor in the atmosphere determines the decrease in heavy precipitation accumulation. Introducing an asymmetric stochastic resetting compensates for the energy cost and reduces the probability of targeted precipitation accumulation to the desired extent.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Chemistry, Multidisciplinary
Damir Malkocevic, Milan Blagojevic
Summary: The current fire scenarios used for structural fire design are based on traditional methods derived from existing fire test data. These traditional methods do not accurately represent real-situation fires, resulting in a need for a field model and deterministic models for fire safety engineering. The study observed the effects of different strategies involving ventilation and geometry changes during the fire's development.
APPLIED SCIENCES-BASEL
(2023)
Article
Mathematical & Computational Biology
Janine Egert, Clemens Kreutz
Summary: In systems biology, the analysis of complex nonlinear systems faces challenges in terms of methodology. One major bottleneck is the lack of realistic test problems for evaluating and comparing computational methods. This study presents an approach for realistic simulation studies using time course data typically measured in systems biology. By utilizing published systems biology models with experimental data, the relationship between model features and measurement features is evaluated, enabling the suggestion of realistic simulation study designs and generation of simulated data for dynamic models. The approach is demonstrated and validated on multiple models, providing a valuable tool for the development of novel methods for dynamic modeling.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2023)
Article
Neurosciences
Eduardo F. Martins, Thiago Lemos, Ghislain Saunier, Thierry Pozzo, Daniel Fraiman, Claudia D. Vargas
FRONTIERS IN HUMAN NEUROSCIENCE
(2017)
Article
Neurosciences
Lucia Amoruso, Agustin Ibanez, Bruno Fonseca, Sebastian Gadea, Lucas Sedeno, Mariano Sigman, Adolfo M. Garcia, Ricardo Fraiman, Daniel Fraiman
Article
Statistics & Probability
Daniel Fraiman, Nicolas Fraiman, Ricardo Fraiman
Article
Statistics & Probability
Daniel Fraiman, Nicolas Fraiman, Ricardo Fraiman
Article
Multidisciplinary Sciences
Daniel Fraiman, Ricardo Fraiman
SCIENTIFIC REPORTS
(2018)
Article
Multidisciplinary Sciences
Martin Dottori, Lucas Sedeno, Miguel Martorell Caro, Florencia Alifano, Eugenia Hesse, Ezequiel Mikulan, Adolfo M. Garcia, Amparo Ruiz-Tagle, Patricia Lillo, Andrea Slachevsky, Cecilia Serrano, Daniel Fraiman, Agustin Ibanez
SCIENTIFIC REPORTS
(2017)
Article
Neurosciences
Martin Dottori, Eugenia Hesse, Micaela Santilli, Martina G. Vilas, Miguel Martorell Caro, Daniel Fraiman, Lucas Sedeno, Agustin Ibanez, Adolfo M. Garcia
Article
Chemistry, Multidisciplinary
Silvina Ponce Dawson
Summary: The International Union of Pure and Applied Physics (IUPAP) is a scientific union representing physics communities worldwide, with a focus on increasing participation and improving conditions for women physicists. The establishment of the Working Group on Women in Physics in 1999 has significantly raised awareness of gender disparities in physics and created an active network of women physicists in many countries.
PURE AND APPLIED CHEMISTRY
(2021)
Article
Biophysics
Cecilia Villarruel, Pablo S. Aguilar, Silvina Ponce Dawson
Summary: Calcium ion is a universal second messenger involved in regulating numerous physiological processes, and its diffusion in the cytosol is hindered by protein buffers. However, recent experimental results show that Ca2+ can freely diffuse in the cytosol at a higher rate than previously thought.
BIOPHYSICAL JOURNAL
(2021)
Article
Mathematics, Interdisciplinary Applications
Estefania Piegari, Silvina Ponce Dawson
MATHEMATICAL AND COMPUTATIONAL APPLICATIONS
(2019)
Article
Physics, Fluids & Plasmas
Daniel Fraiman
Article
Engineering, Multidisciplinary
Andressa Cerqueira, Daniel Fraiman, Claudia D. Vargas, Florencia Leonardi
IEEE TRANSACTIONS ON NETWORK SCIENCE AND ENGINEERING
(2017)
Article
Biochemistry & Molecular Biology
Lucia F. Lopez, Silvina Ponce Dawson
Article
Biochemistry & Molecular Biology
E. Piegari, L. F. Lopez, S. Ponce Dawson
Article
Biochemistry & Molecular Biology
Emiliano Perez Ipina, Silvina Ponce Dawson