Numerical Simulations of Short-Term Non-tidal Ocean Mass Anomalies

2010 ◽  
pp. 119-129
Author(s):  
Henryk Dobslaw ◽  
Maik Thomas
Keyword(s):  
Numerical Simulations ◽  
Short Term ◽  
Ocean Mass

Response of phreatophytes to short-term groundwater pumping in a semiarid region: Field experiments and numerical simulations

Ecohydrology ◽  
2018 ◽  
Vol 11 (4) ◽  
pp. e1948 ◽  
Author(s):  
Lihe Yin ◽  
Yangxiao Zhou ◽  
Dandan Xu ◽  
Jun Zhang ◽  
Xiaoyong Wang ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Field Experiments ◽  
Semiarid Region ◽  
Groundwater Pumping ◽  
Short Term

Modulation of Context-Dependent Spatiotemporal Patterns within Packets of Spiking Activity

2017 ◽  
Vol 29 (5) ◽  
pp. 1263-1292 ◽  
Author(s):  
Miho Itoh ◽  
Timothée Leleu
Keyword(s):  
Simple Model ◽  
Numerical Simulations ◽  
Analytical Framework ◽  
Spike Timing ◽  
Spatiotemporal Patterns ◽  
Top Down ◽  
Short Term ◽  
Avalanche Dynamics ◽  
Context Dependent ◽  
Spiking Activity

Recent experiments have shown that stereotypical spatiotemporal patterns occur during brief packets of spiking activity in the cortex, and it has been suggested that top-down inputs can modulate these patterns according to the context. We propose a simple model that may explain important features of these experimental observations and is analytically tractable. The key mechanism underlying this model is that context-dependent top-down inputs can modulate the effective connection strengths between neurons because of short-term synaptic depression. As a result, the degree of synchrony and, in turn, the spatiotemporal patterns of spiking activity that occur during packets are modulated by the top-down inputs. This is shown using an analytical framework, based on avalanche dynamics, that allows calculating the probability that a given neuron spikes during a packet and numerical simulations. Finally, we show that the spatiotemporal patterns that replay previously experienced sequential stimuli and their binding with their corresponding context can be learned because of spike-timing-dependent plasticity.

scholarly journals Simulations on the survivability of Tidal Dwarf Galaxies

2014 ◽  
Vol 10 (S309) ◽  
pp. 157-158
Author(s):  
Sylvia Ploeckinger ◽  
Simone Recchi ◽  
Gerhard Hensler ◽  
Pavel Kroupa
Keyword(s):  
Dark Matter ◽  
Numerical Simulations ◽  
Dwarf Galaxies ◽  
Time Dependent ◽  
Short Term ◽  
Stellar Feedback ◽  
Term Evolution ◽  
Matter Component ◽  
Simulation Time

AbstractWe present detailed numerical simulations of the evolution of Tidal Dwarf Galaxies (TDGs) after they kinematically decouple from the rest of the tidal arm to investigate their survivability. Both the short-term (500 Myr) response of TDGs to the stellar feedback of different underlying stellar populations as well as the long-term evolution that is dominated by a time dependent tidal field is examined. All simulated TDGs survive until the end of the simulation time of up to 3 Gyr, despite their lack of a stabilising dark matter component.

On the Response of a Spar Floating Wind Turbine Under the Occurrence of Extreme Events

2013 ◽  
Author(s):  
Vincenzo Nava ◽  
Hasan Bagbanci ◽  
C. Guedes Soares ◽  
Felice Arena
Keyword(s):  
Numerical Simulations ◽  
Wind Turbine ◽  
Equations Of Motion ◽  
Hydrodynamic Characteristics ◽  
Deterministic Approach ◽  
Short Term ◽  
Sea State ◽  
Time Histories ◽  
Low Probability ◽  
The Time Domain

In this paper, the quasi-determinism theory is applied for the computation of forces jointly generated from wind and waves. A coupled 3-degree-of-freedom (3-dofs) model of a floating spar-type 5 MW wind turbine is herein studied subject to wind and waves under the occurrence of wind and sea. Numerical simulations of forces in the time domain are carried out using FAST software, taking into account the hydrodynamic characteristics of the floater obtained in the frequency domain by WAMIT through panel method. Equations of motion are integrated by means of a Runge-Kutta routine and time histories and statistics of responses of the model are calculated. Further, a quasi-deterministic approach is followed in order to predict the short-term responses under the occurrence of extreme (low probability, given a fixed sea state) events and results finally compared with those obtained from the more time-consuming numerical simulations.

scholarly journals Effect of Drainage and Consolidation on the Pore Water Pressures and Total Stresses within Backfilled Stopes and on Barricades

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
El Mustapha Jaouhar ◽  
Li Li
Keyword(s):  
Hydraulic Conductivity ◽  
Numerical Simulations ◽  
Young’S Modulus ◽  
Pore Water ◽  
Hydraulic Properties ◽  
Underground Mine ◽  
Filling Rate ◽  
Short Term ◽  
Pore Water Pressures ◽  
Backfilled Stopes

The pore water pressures (PWPs) and total stresses during the placement of a slurried backfill in underground mine stopes are the key parameters for the design of barricades, built to retain the backfill in the stopes. They can be affected by the drainage and consolidation of the backfill. Over the years, several studies have been reported on the pressure and stresses in backfilled stopes by accounting for the drainage and consolidation. Most of them focused on the pressure and stresses in the stopes, few specifically on the barricades. The effect of the number of draining holes commonly installed through the barricade has never been studied. In this paper, the influence of hydraulic properties and filling rate of the backfill, stope size, barricade location, and number of draining holes is systematically investigated with numerical simulations. The results show that the stresses in the backfilled stope and on the barricade largely depend on the filling rate, hydraulic conductivity, and Young’s modulus of the backfill. The draining holes can significantly decrease the PWP, but only slightly the total stresses on the barricades in short term.

scholarly journals Thermal damping and retardation in karst conduits

2015 ◽  
Vol 19 (1) ◽  
pp. 137-157 ◽  
Author(s):  
A. J. Luhmann ◽  
M. D. Covington ◽  
J. M. Myre ◽  
M. Perne ◽  
S. W. Jones ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Water Temperature ◽  
High Temporal Resolution ◽  
Short Term ◽  
Variable Diameter ◽  
Conservative Tracer ◽  
Water Temperature Data ◽  
Flow Through ◽  
Conduit Diameter ◽  
Path Properties

Abstract. Water temperature is a non-conservative tracer in the environment. Variations in recharge temperature are damped and retarded as water moves through an aquifer due to heat exchange between water and rock. However, within karst aquifers, seasonal and short-term fluctuations in recharge temperature are often transmitted over long distances before they are fully damped. Using analytical solutions and numerical simulations, we develop relationships that describe the effect of flow path properties, flow-through time, recharge characteristics, and water and rock physical properties on the damping and retardation of thermal peaks/troughs in karst conduits. Using these relationships, one can estimate the thermal retardation and damping that would occur under given conditions with a given conduit geometry. Ultimately, these relationships can be used with thermal damping and retardation field data to estimate parameters such as conduit diameter. We also examine sets of numerical simulations where we relax some of the assumptions used to develop these relationships, testing the effects of variable diameter, variable velocity, open channels, and recharge shape on thermal damping and retardation to provide some constraints on uncertainty. Finally, we discuss a multitracer experiment that provides some field confirmation of our relationships. High temporal resolution water temperature data are required to obtain sufficient constraints on the magnitude and timing of thermal peaks and troughs in order to take full advantage of water temperature as a tracer.

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