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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Space-time finite and boundary element methods for the wave equation
波动方程 时空有限元 边界元方法
2023/4/21
In this talk we will review some recent results on space-time finite and boundary element methods for the wave equation. As a first model problem we consider the inhomogeneous wave equation with zero ...
LAND USE, MICROCLIMATE, AND SURFACE RUNOFF LINKAGES: SPACE-TIME MODELING FROM ROKEL-SELI RIVER BASIN, SIERRA LEONE
Land use change microclimate surface hydrology open source geospatial Sierra Leone
2018/11/8
This study mainly utilized the Soil and Water Assessment Tool (SWAT) together with SWAT-CUP, both free and open source software (FOSS), to construct a distributed hydrologic flow model for the Rokel-S...
Static-Memory-Hard Functions and Nonlinear Space-Time Tradeoffs via Pebbling
memory-hard functions pebbling space-time trade-offs
2018/3/5
Pebble games were originally formulated to study time-space tradeoffs in computation, modeled by games played on directed acyclic graphs (DAGs). Close connections between pebbling and cryptography hav...
Temporal Arrows in Space-Time
Arrows of time entropy four-dimensional world invariance space-time thermodynamics
2016/6/15
The prevailing current of thought in both physics and philosophy is that relativistic space-time provides no means for the objective measurement of the passage of time. Kurt Gödel, for instance, ...
Space-time,relativity and quantum mechanics:In search of a deeper connection
spacetime translation invariance relativistic invariance linear quantum evolution free Schrodinger equation
2016/6/13
It has been shown that the Lorentz transformations in special relativity can be derived in terms of the principle of relativity and certain properties of space and time such as homogeneity. In this pa...
The GRW flash theory:a relativistic quantum ontology of matter in space-time?
Bell’s theorem Bohmian mechanics collapse of the wave-function dispositionalism GRW flash GRW mass density Humeanism Lorentz-invariance primitive ontology propensities relativistic collapse theory
2016/6/13
John Bell proposed an ontology for the GRW modification of quantum mechanics in terms of flashes occurring at space-time points. The paper spells out the motivation for this ontology, enquires into th...
The back cover text of this excellent monograph closes with a b old remark on its metho dology:“[T]he assumption that the fundamental laws of physics are simple in terms of the fundamental physical pr...
Proofs of Space-Time and Rational Proofs of Storage
proofs of work proofs of space bitcoin
2016/1/27
We introduce a new cryptographic primitive: Proofs of SpaceTime
(PoSTs) and construct a practical protocol for implementing these
proofs. A PoST allows a prover to convince a verifier that she spent...
Estimation of fixed effects panel regression models with separable and nonseparable space-time filters
Panel data Spatial cointegration Explosive roots Fixed e¤ects
2016/1/25
This paper considers a quasi-maximum likelihood estimation for a linear panel data model with time and individual …xed e¤ects, where the disturbances have dynamic and spatial correlations which might ...
Estimation of fixed effects panel regression models with separable and nonseparable space-time filters
Spatial autoregression Panel data Spatial cointegration Explosive roots Fixed e¤ects
2016/1/20
This paper considers a quasi-maximum likelihood estimation for a linear panel data model with time and individual …xed e¤ects, where the disturbances have dynamic and spatial correlations which might ...
A Hybrid Approach to Model Nonstationary Space-Time Series
Space-Time Series Forecasting Stationarity Autocorrelations Artificial Neural Network STARMA
2015/12/2
In recent years the Space-Time Autoregressive Moving-Average (STARMA) model family has been proven a useful tool in modelling multiple time series data that correspond to different spatial locations (...
Space-time variations of the Umbria-Marche region instrumental seismicity
b value seismicity Apennines
2015/9/29
In the Umbria-Marche region, space and time variations concerning the b value were studied by instrumental seismicity from January 1987 to May 1999, according to the Bender method. Data were divided i...
BLIND SOURCE SEPARATION BASED ON SPACE-TIME-FREQUENCY DIVERSITY
BLIND SOURCE SEPARATION SPACE-TIME-FREQUENCY DIVERSITY
2015/9/29
We investigate the assumption that sources have disjoint support in the time domain, time-frequency domain, or frequency domain. We call such signals disjoint orthogonal. The class of signals that app...
SPACE-TIME SERIES OF MODIS SNOW COVER PRODUCTS FOR HYDROLOGIC SCIENCE
MODIS Snow Cover Products Hydrologic Scienc
2015/9/8
The Moderate-Resolution Imaging Spectroradiometer flies on two NASA/EOS satellites, , each imaging
most of the Earth every day, Terra in the morning, Aqua in the afternoon. MODIS has 36 spectral band...
Southern-Tyrrhenian seismicity in space-time-magnitude domain
Southern-Tyrrhenian Sea statistical models aftershock sequences background seismicity
2015/9/8
An analysis is conducted on a catalogue containing more than 2000 seismic events
occurred in the southern Tyrrhenian Sea between 1988 and October 2002, as an attempt
to characterise the main seismog...