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Seasonal Cycles of Along-Track Tropical Cyclone Maximum Intensity
2019
Monthly Weather Review
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Because no individual V max is tied directly to the mean along-track PI, we illustrate the intramonthly variability of along-track PI with its IQR. ...
Beyond these outliers, along-track PI performs well as a predictor of the high percentiles of V max , acting as a consistent limit on climatological tropical cyclone wind speeds during the NA hurricane ...
doi:10.1175/mwr-d-19-0021.1
fatcat:tuxknmjrifdmrprzfqpt3wvo44
LOW-ALTITUDE RECONNECTION INFLOW-OUTFLOW OBSERVATIONS DURING A 2010 NOVEMBER 3 SOLAR ERUPTION
2012
Astrophysical Journal
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The inflow speeds of these pairs are measured to be 10^2 km/s with outflow speeds ranging from 10^2-10^3 km/s - indicating acceleration during the reconnection process. ...
Using the inflow speeds and a range of Alfven speeds, we estimate the Alfvenic Mach number which appears to decrease with time. ...
The average inflow speeds and the initial outflow speeds (derived by fitting a 2-D polynomial to the outflow tracks) are provided. ...
doi:10.1088/0004-637x/754/1/13
fatcat:lnzwst5rgfftzhzo3e27zto7a4
Traffic Regulation via Controlled Speed Limit
2017
SIAM Journal of Control and Optimization
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We study an optimal control problem for traffic regulation via variable speed limit. ...
We aim at minimizing the L 2 quadratic error to a desired outflow, given an inflow on a single road. ...
Instead, [23, 24, 25] use model predictive control (MPC) to optimally coordinate variable speed limits for freeway traffic with the aim of suppressing shock waves. ...
doi:10.1137/16m1066038
fatcat:4alqm46wvbejnah7n77tbnc2cm
Traffic regulation via controlled speed limit
[article]
2016
arXiv
pre-print
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We study an optimal control problem for traffic regulation via variable speed limit. ...
The traffic flow dynamics is described with the Lighthill-Whitham-Richards (LWR) model with Newell-Daganzo flux function. ...
Instead, [23, 24, 25] use model predictive control (MPC) to optimally coordinate variable speed limits for freeway traffic with the aim of suppressing shock waves. ...
arXiv:1603.04785v1
fatcat:7ij3c4l6b5fyxflomlglesnloa
Object-Based Algorithm for the Identification and Tracking of Convective Outflow Boundaries in Numerical Models
2018
Monthly Weather Review
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A novel object-based algorithm capable of identifying and tracking convective outflow boundaries in convection-allowing numerical models is presented in this study. ...
These applications are illustrated for a retrospective case study simulated with a convection-allowing ensemble prediction system. ...
The second dynamical constraint imposes an upper limit on the object's propagation speed and is denoted as V 1 O . ...
doi:10.1175/mwr-d-18-0116.1
fatcat:itwfluaow5b2vimts6vtkusxh4
Surface circulation in the Gulf of Cadiz: 2. Inflow-outflow coupling and the Gulf of Cadiz slope current
2009
Journal of Geophysical Research
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It is speculated that the cycle in the observed currents is associated with variability in the inflow/outflow coupling system, rather than driven by seasonally changing wind forcing. ...
Observations, both original and revisited, and realistic numerical modeling are used together to describe the structure and variability of the slope current system above the Mediterranean outflow. ...
jet of about 20-30 km wide with depths of around 200-300 m, and with speeds in the order of 0.2-0.3 m/s. ...
doi:10.1029/2008jc004771
fatcat:tnthd5yprffudhg46wgmw4f72m
Optimal Control of Freeway Networks with Bottlenecks and Static Demand
2005
Transportation Research Record
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We consider optimally coordinated freeway traffic control for networks containing bottlenecks with capacity drop and hysteresis behavior. ...
We develop an approach that addresses these problems, where we use a generalized representation of flow-limiting control measures and bottlenecks. ...
Note that for variable speed limits, the speed limit value must be lower than the critical speed in order to limit the flow. ...
doi:10.3141/1925-04
fatcat:ezjqjds7frfv5p7o2ymwthhpja
On the behaviour of stellar winds that exceed the photon-tiring limit
2009
Monthly notices of the Royal Astronomical Society
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Typically, these winds have a very high density but a terminal flow speed well below the escape speed at the stellar surface. ...
At larger distances, the flow eventually becomes uniformly outward, though still quite variable. ...
AC K N OW L E D G M E N T S This work was carried out with partial support from NSF grant AST-0507581. NJS wishes to thank the support of ISF grant 1325/06. We thank J. MacDonald, N. ...
doi:10.1111/j.1365-2966.2008.14366.x
fatcat:txqayyu4srab5mw6p4gm3tffoe
Observations of inertial currents in a lagoon in southeastern Iceland using terrestrial radar interferometry and automated iceberg tracking
2015
Computers & Geosciences
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Over our 43.5-h observation period, the lagoon has clockwise circulation with current speeds of order 3-8 cm/s and occasional strong glacier outflows of up to ∼15 cm/s. ...
The currents driven by the glacial outflows appear to be dominantly inertial. ...
Acknowledgments We thank the Jökulsárlón lagoon staff for their help with data collection. We also thank Björn Oddsson for his assistance with logistics in the field. ...
doi:10.1016/j.cageo.2015.05.012
fatcat:cubs4mguejbnno6j3335okrfua
Interbasin Differences in the Relationship between SST and Tropical Cyclone Intensification
2018
Monthly Weather Review
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First, variability of SST along TCs' tracks is lower in the Atlantic. ...
Finally, SST tends to vary out of phase with vertical wind shear and outflow temperature in the western Pacific. ...
Because SST decreases northward, outflow temperature tends to vary out of phase with SST along western Pacific TCs' tracks. ...
doi:10.1175/mwr-d-17-0155.1
fatcat:7ci5zce2fbh4dmoftduf5eofke
Satellite‐derived characteristics of Saharan cold pool outflows during boreal summer
2020
Journal of Geophysical Research - Atmospheres
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Propagation speeds decay exponentially through their lifetime, but on average speeds are 1.5 m/s higher at night. 22.5% of the observed events exceed a total travelled distance of 300 km, with an overwhelming ...
As such, the role of CPOs in the observed variability of dust through the monsoon season remains unclear. To remedy these issues, an improved observational benchmark is needed. ...
Each individual case is then reviewed with manual analysis of SEVIRI imagery to check that the outflow boundary did indeed pass over the station. 3.0.0.5 Meteorological variables used to detect the passage ...
doi:10.1029/2020jd033387
fatcat:gvyosbjh3fa2zilc3gywigovna
Optimal inflow control of production systems with finite buffers
2014
Discrete and continuous dynamical systems. Series B
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We introduce the optimal inflow control problem for buffer restricted production systems involving a conservation law with discontinuous flux. ...
Based on an appropriate numerical method inspired by the wave front tracking algorithm, we present two techniques to solve the optimal control problem efficiently. ...
We introduce a variable f n out that limits the outflow in a following way: (OUTFLOW): F n N = min{aρ n N , f n out } ∀n = 1, . . . , N T − 1. ...
doi:10.3934/dcdsb.2015.20.107
fatcat:yr7yxpblzfgatp4qfq4kvlwnye
Observations and modelling of microphysical variability, aggregation and sedimentation in tropical anvil cirrus outflow regions
2012
Atmospheric Chemistry and Physics
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Ice Water Content) in the anvil Ci cloud decreased, but also that the average particle size (weighted by number) remained relatively constant along the length of the anvil outflow. ...
Aircraft measurements of the microphysics of a tropical convective anvil (at temperatures ~−60 °C) forming above the Hector storm, over the Tiwi Islands, Northern Australia, have been conducted with ...
Within track 2, IWCs peaked at >1 g m −3 but showed greater variability. n 0 values (not shown) remained reasonably consistent across the outflow (albeit with small scale variations) as did values of λ ...
doi:10.5194/acp-12-6609-2012
fatcat:yzgowrw7hbbojir4w5t5psbbu4
Modelling Backward Travelling Holes in Mixed Traffic Conditions Using an Agent Based Simulation
[chapter]
2016
Traffic and Granular Flow '15
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Space corresponding to a leaving vehicle is not available immediately on the upstream end of the link, instead the space travels backward with a constant speed. This space is named as 'hole'. ...
The sensitivity of the presented approach is tested with the help of flow density contours. ...
This branch is then met with the upward sloping free flow branch at a capacity below the outflow capacity. ...
doi:10.1007/978-3-319-33482-0_53
fatcat:yazpjhet6fazfewrbmmztyraae
Perimeter gating control and citywide dynamic user equilibrium: A macroscopic modeling framework
2020
Transportation Research Part C: Emerging Technologies
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It tracks vehicle traveled distance inside the reservoir while assigning the same instantaneous speed to all vehicles defined by the MFD. ...
The presented simulation results show that the perimeter gating control helps to maintain congestion at the desired level with significant improvements in the total time spent and the mean speed in the ...
We design two PI controllers with the anti-windup scheme 180 and saturation limits on manipulated variables; routing discipline is designed based on UE obtained by exact predictive travel time. ...
doi:10.1016/j.trc.2019.11.016
fatcat:mbjzppdzsjhnjackbaetfhkqsy
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