A5008840813- Theoretical and Computational Physics
- Complex Systems and Time Series Analysis
- Financial Risk and Volatility Modeling
- Stochastic processes and financial applications
- Financial Markets and Investment Strategies
- Complex Network Analysis Techniques
- Stochastic processes and statistical mechanics
- Cardiac electrophysiology and arrhythmias
- Laser-Plasma Interactions and Diagnostics
- Earthquake Detection and Analysis
- Opinion Dynamics and Social Influence
- Monetary Policy and Economic Impact
- Atrial Fibrillation Management and Outcomes
- Material Dynamics and Properties
- Statistical Methods and Inference
- Market Dynamics and Volatility
- Historical and Cultural Archaeology Studies
- Insect and Arachnid Ecology and Behavior
- Nuclear Physics and Applications
- Corporate Finance and Governance
- Evolution and Genetic Dynamics
- Plant and animal studies
- Advanced Mathematical Modeling in Engineering
- Laser-Matter Interactions and Applications
- Forecasting Techniques and Applications
Imperial College London
2016-2025
Aarhus University
2014-2024
Lawrence Livermore National Laboratory
2010-2024
Health Outcomes Solutions (United States)
2023
Weatherford College
2023
Utah Department of Health
2020-2021
University of Bristol
2021
Nevada National Security Site
2020
Fifth Gait Technologies (United States)
2020
VA Greater Los Angeles Healthcare System
2019
We introduce a new nonconservative self-organized critical model. This model is equivalent to quasistatic two-dimensional version of the Burridge-Knopoff spring-block earthquakes. Our displays robust power-law behavior. The exponent not universal; rather it depends on level conservation. A dynamical phase transition from localized nonlocalized behavior seen as conservation increased. gives good prediction Gutenberg-Richter law and an explanation variances in observed b values.
We show that the distribution of waiting times between earthquakes occurring in California obeys a simple unified scaling law valid from tens seconds to years. The short time clustering, commonly referred as aftershocks, is nothing but limit general hierarchical properties earthquakes. There no unique operational way distinguishing main shocks and aftershocks. In law, Gutenberg-Richter $b$ value, exponent $\ensuremath{-}1$ Omori for fractal dimension ${d}_{f}$ appear critical indices.
Abstract Background The evidence base for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is nascent. We sought to characterize SARS-CoV-2 transmission within US households and estimate the household secondary infection rate (SIR) inform strategies reduce transmission. Methods recruited patients with laboratory-confirmed their contacts in Utah Wisconsin during 22 March 2020–25 April 2020. interviewed all obtain demographics medical histories. At initial visit, 14 days later,...
We show that rain events are analogous to a variety of nonequilibrium relaxation processes in Nature such as earthquakes and avalanches. Analysis high-resolution data reveals power laws describe the number versus size droughts duration. In addition, accumulated water column displays scale-less fluctuations. These statistical properties fingerprints self-organized critical process may serve benchmark for models precipitation atmospheric processes.
The probability density function (PDF) of a global measure in large class highly correlated systems has been suggested to be the same functional form. Here, we identify analytical form PDF one such measure, order parameter low temperature phase 2D XY model. We demonstrate that this describes fluctuations quantities other equilibrium and nonequilibrium systems. These include coupled rotor model, Ising percolation models, models forest fires, sandpiles, avalanches, granular media...
We propose and verify a unified scaling law that provides framework for viewing the probability of occurrence earthquakes in given region cutoff magnitude. The shows occur hierarchical correlated clusters, which overlap with other spatially separated clusters large enough time periods areas. For small time-scale, only single group can be sampled. links together Gutenberg--Richter Law, Omori Law aftershocks, fractal dimensions faults. is shown to short limit general phenomenon containing...
A connection between the distribution of lifetimes and power spectrum is derived. It shown that flow sand down slope in cellular automaton model, considered recently by Bak, Tang, Wiesenfeld [Phys. Rev. Lett. 59, 381 (1987)], has a 1/${f}^{2}$ one two dimensions. The over rim system behaves similar to transport real pile as measured Jaeger, Liu, Nagel 62, 40 (1989)].
We have studied experimentally transport properties in a slowly driven granular system which recently was shown to display self-organized criticality [Frette et al., Nature (London) 379, 49 (1996)]. Tracer particles were added pile and their transit times measured. The distribution of is constant with crossover decaying power law. average velocity decreases size. This due an increase the active zone depth relaxation processes generate coherently moving regions grains mixed convection....
We present a two-dimensional continuous cellular automaton that is equivalent to driven spring-block model. Both the conservation and anisotropy in model are controllable quantities. Above critical level of conservation, exhibits self-organized criticality. The self-organization this system hence exponents depend on boundary conditions. In isotropic nonconservative phase, change continuously as function conservation. Furthermore, vary when changing conditions smoothly. Consequently, there no...
Adaptive behaviour, cognition and emotion are the result of a bewildering variety brain spatio-temporal activity patterns. An important problem in neuroscience is to understand mechanism by which human brain's 100 billion neurons trillion synapses manage produce this large repertoire cortical configurations flexible manner. In addition, it recognized that temporal correlations across such cannot be arbitrary, but they need meet two conflicting demands: while diverse areas should remain...
Limited data exist on severe acute respiratory syndrome coronavirus 2 in children. We described infection rates and symptom profiles among pediatric household contacts of individuals with disease 2019.We enrolled 2019 their contacts, assessed daily symptoms prospectively for 14 days, obtained specimens real-time reverse transcription polymerase chain reaction serology testing. Among (<18 years), we transmission, the risk factors infection, calculated positive negative predictive values....
This tutorial aims at giving an introductory treatment of the circuit analysis superconducting qubits, i.e., two-level systems in circuits. It also touches upon couplings between such qubits and how microwave driving these can be used for single- two-qubit gates, as well to include noise when calculating dynamics system. We discuss higher-dimensional qudits. The is intended new researchers with limited or no experience field but should accessible anyone a bachelor's degree physics....
We show that a two‐dimensional spring‐block model for earthquakes is equivalent to continuous, nonconservative cellular automaton model. The level of conservation function the relevant elastic parameters describing exhibits power law distributions energy released during an earthquake. corresponding exponent not universal. It conservation. Thus observed variation in b value Gutenberg‐Richter could be explained by parameters. address problem boundary conditions and display results two extreme...
We present a model of evolutionary ecology consisting web interacting individuals, tangle-nature model. The reproduction rate individuals characterized by their genome depends on the composition population in genotype space. Ecological features such as taxonomy and macroevolutionary mode dynamics are emergent properties. macrodynamics exhibit intermittent two-mode switching with gradually decreasing extinction rate. generated ecologies become better adapted well more complex collective...
Improved understanding of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spectrum disease is essential for clinical and public health interventions. There are limited data on mild or asymptomatic infections, but recognition these individuals key as they contribute to viral transmission. We describe the symptom profiles from with SARS-CoV-2 infection.From 22 March April 2020 in Wisconsin Utah, we enrolled prospectively observed 198 household contacts exposed SARS-CoV-2....