From Property to Heritage

Miura, Keiko

doi:10.4000/books.gup.310

Cited by 4 publications

(4 citation statements)

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“…In recent years a number of two-dimensional numerical studies have been published aiming at various aspects of the problem (e.g., Tajima, & Leboeuf (1980), Miura (1984), Miura (1987), Miura (1992, Wang & Robertson (1984), Wu (1986), Belle-Hamer et al (1988), Belmont & Chanteur (1989)), especially as it applies to the earth's magnetosphere. However, the nonlinear physics of MHD KH unstable flows is very complex, and studies have generally been too limited by computational constraints (low numerical resolution and insufficient dynamical time coverage) to answer basic questions definitively about either the important physical processes involved or the eventual fluid state.…”

Section: Introductionmentioning

confidence: 99%

The Magnetohydrodynamic Kelvin-Helmholtz Instability: A Two-dimensional Numerical Study

Frank

Jones²,

Ryu

et al. 1996

ApJ

134

133

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We have carried out two-dimensional simulations of the nonlinear evolution of unstable sheared magnetohydrodynamic flows. These calculations extend the earlier work of Miura (1984) and consider periodic sections of flows containing aligned magnetic fields. Two equal density, compressible fluids are separated by a shear layer with a hyperbolic tangent velocity profile. We considered two cases: a strong magnetic field (Alfvén Mach number, M a = 2.5) and a weak field (M a = 5). Each flow rapidly evolves until it reaches a nearly steady condition, which is fundamentally different from the analogous gasdynamic state. Both MHD flows relax to a stable, laminar flow on timescales less than or of the order of 15 linear growth times, measured from saturation of the instability. That timescale is several orders of magnitude less than the nominal dissipation time for these simulated flows, so this condition represents an quasi-steady relaxed state analogous to the long-lived single vortex, known as "Kelvin's Cat's Eye", formed in two-dimensional nearly ideal gasdynamic simulations of a vortex sheet.The strong magnetic field case reaches saturation as magnetic tension in the displaced flow boundary becomes sufficient to stabilize it. That flow then relaxes in a straightforward way to the steady, laminar flow condition. The weak magnetic field case, on the other hand, begins development of the vortex expected for gasdynamics, but that vortex is destroyed by magnetic stresses that locally become strong. Magnetic topologies lead to reconnection and dynamical alignment between magnetic and velocity fields. Together these processes produce a sequence of intermittent vortices and subsequent relaxation to a nearly laminar flow condition in which the magnetic cross helicity is nearly maximized. Remaining irregularities show several interesting properties. A pair of magnetic flux tubes are formed that straddle the boundary between the oppositely moving fluids. Velocity and magnetic fluctuations within those features are closely aligned, representing Alfvén waves propagating locally downstream.The flux tubes surround a low density channel of hot gas that contains most of the -3excess entropy generated through the relaxation process.

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Section: Introductionmentioning

confidence: 99%

The Magnetohydrodynamic Kelvin-Helmholtz Instability: A Two-dimensional Numerical Study

Frank

Jones²,

Ryu

et al. 1996

ApJ

134

133

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“… 11 Miura 2004, 2010, 2011a, 2011b, 2011c, 2011d, 2015, 2016a, 2016b, 2018; Luco 2006, 2013; Vanna 2006; Butland 2012. …”

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confidence: 99%

“… 85 Ang, Prenowitz, and Thompson (1996) 1998, 100, 192; Dagens (1989)1995, 96–99; Miura 2004, 122–27; 2010, 109; 2011b, 99; 2015, 255–56; 2018, 46; Falser 2015, 303; Gillespie 2009, 341–42; UNESCO 1993, 7, 192. …”

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A dilemma of World Heritage ideals and challenges in Southeast Asia

Miura

2022

Int J Cult Prop

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Fifty years after the ratification of the World Heritage Convention, we have come to learn that there is a huge discrepancy between the United Nations Educational, Scientific and Cultural Organization’s (UNESCO) ideals of protecting heritage sites with outstanding universal values and unmatched realities in situ. I attempt to elucidate what World Heritage ideals of heritage protection are held in iconic sites in Southeast Asia. The studied sites are ancient monumental heritage sites of national importance – namely, Borobudur of Indonesia, Sukhothai and Ayutthaya of Thailand, and Angkor of Cambodia. The authorities in these countries have converted heritage sites into parks for visitors and for capitalization, which has placed authenticity and integrity at stake as well as converting the sites for contestation between the authorities and local communities. In order to solve the dilemma of the World Heritage ideals and their unwanted realities, I explore possible effective approaches for UNESCO and its partners to take into consideration.

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Collaboration, engagement, and Cambodia: Archaeological perspectives on cultural heritage

Stark

2020

Journal of Community Archaeology & Heritage

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From Property to Heritage

Cited by 4 publications

References 0 publications

The Magnetohydrodynamic Kelvin-Helmholtz Instability: A Two-dimensional Numerical Study

The Magnetohydrodynamic Kelvin-Helmholtz Instability: A Two-dimensional Numerical Study

A dilemma of World Heritage ideals and challenges in Southeast Asia

Collaboration, engagement, and Cambodia: Archaeological perspectives on cultural heritage

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