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A model of roof-top surface pressures produced by conical vortices : Model development
Banks, D.,Meroney, R.N. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.3
The objective of this study is to understand the flow above the front edge of low-rise building roofs. The greatest suction on the building is known to occur at this location as a result of the formation of conical vortices in the separated flow zone. It is expected that the relationship between this suction and upstream flow conditions can be better understood through the analysis of the vortex flow mechanism. Experimental measurements were used, along with predictions from numerical simulations of delta wing vortex flows, to develop a model of the pressure field within and beneath the conical vortex. The model accounts for the change in vortex suction with wind angle, and includes a parameter indicating the strength of the vortex. The model can be applied to both mean and time dependent surface pressures, and is validated in a companion paper.
The internet governance debate is one where civil society advocates can make a real difference
Banks, Karen Asian pacific women's information network center 2005 APWIN Vol.7 No.-
Of the all the controversial, contention-ridden issues surfaced and discussed during the Geneva Phase of the WSIS, internet governance deserves special attention because it creates a much needed space to generate greater understanding of what all consider to be a critical global resource, to what extend it can or cannot, should or should not be regulated and what the respective roles and responsibilities of governments, civil society, the private sector and international organizations should be in emerging internet governance arrangements. This paper explains what internet governance is, efforts of the Working Group on Internet Governance(WGIG) and the challenges faced by all.
Holographic thermal DC response in the hydrodynamic limit
Banks, Elliot,Donos, Aristomenis,Gauntlett, Jerome P,Griffin, Tom,Melgar, Luis Institute of Physics 2017 Classical and quantum gravity Vol.34 No.4
<P>We consider black hole solutions of Einstein gravity that describe deformations of CFTs at finite temperature in which spatial translations have been broken explicitly. We focus on deformations that are periodic in the non-compact spatial directions, which effectively corresponds to considering the CFT on a spatial torus with a non-trivial metric. We apply a DC thermal gradient and show that in a hydrodynamic limit the linearised, local thermal currents can be determined by solving linearised, forced Navier–Stokes equations for an incompressible fluid on the torus. We also show how sub-leading corrections to the thermal current can be calculated as well as showing how the full stress tensor response that is generated by the DC source can be obtained. We also compare our results with the fluid-gravity approach.</P>
Banks, Elliot,Donos, Aristomenis,Gauntlett, Jerome P.,Griffin, Tom,Melgar, Luis American Physical Society 2017 Physical Review D Vol.95 No.2
<P>We study the thermal transport properties of general conformal field theories (CFTs) on curved spacetimes in the leading order viscous hydrodynamic limit. At the level of linear response, we show that the thermal transport is governed by a system of forced linearized Navier-Stokes equations on a curved space. Our setup includes CFTs in flat spacetime that have been deformed by spatially dependent and periodic local temperature variations or strains that have been applied to the CFT, and hence is relevant to CFTs arising in condensed matter systems at zero charge density. We provide specific examples of deformations which lead to thermal backflow driven by a dc source: that is, the thermal currents locally flow in the opposite direction to the applied dc thermal source. We also consider thermal transport for relativistic quantum field theories that are not conformally invariant.</P>
A model of roof-top surface pressures produced by conical vortices : Evaluation and implications
Banks, D.,Meroney, R.N. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.4
The greatest suction on the cladding of flat roof low-rise buildings is known to occur beneath the conical vortices that form along the roof edges for cornering winds. In a companion paper, a model of the vortex flow mechanism has been developed which can be used to connect the surface pressure beneath the vortex to adjacent flow conditions. The flow model is experimentally validated in this paper using simultaneous velocity and surface pressure measurement on a 1 : 50 model of the Texas Tech University experimental building in a wind tunnel simulated atmospheric boundary layer. Flow visualization gives further insight into the nature of peak suction events. The flow model is shown to account for the increase in suction towards the roof corner as well as the presence of the highest suction at wind angles of $60^{\circ}$. It includes a parameter describing vortex suction strength, which is shown to be related to the nature of the reattachment, and also suggests how different components of upstream turbulence could influence the surface pressure.
Karen Banks Asian pacific women's information network center 2002 APWIN Vol.4 No.-
This document locates APC WNSP's GEM work in the context of overall development issues of gender and lCTs. It sets out critical lCT issues relevant to gender equality and women's empowerment in the context of current context of globalisation. This section also presents APC and APC WNSP' s analysis of these issues and our approach to using lCTs for development.