47 Result(s)

Article

The turbulent destruction of interstellar clouds

The interaction of an astrophysical shock with a cloud typically occurs at high Reynolds number, and in such cases will be highly turbulent. However, the formation of fully developed turbulence is usually prev...

J. M. Pittard, T. W. Hartquist, J. E. Dyson… in Astrophysics and Space Science (2011)

Article

Discharge of lubricant from air turbine handpieces

Article

Cautionary Tails

We briefly discuss the observational evidence for linear features in diffuse astronomical sources. We then discuss their formation either by radiation shadowing or by hydrodynamic processes.

J.E. Dyson in Astrophysics and Space Science (2003)

Article

Self-Similar Evolution of Remnants With Conductively Driven Mass-Loading

We present self-similar solutions for remnants that are mass-loaded by conductively driven evaporation. This work extends the earlier results of Chièze and Lazareff through the inclusion of the explicit depend...

J.M. Pittard, J.E. Dyson, T.W. Hartquist in Astrophysics and Space Science (2001)

Article

The Fine Structures of Planetary Nebulae

Most theoretical studies of the dynamics of planetary nebulae assume that the slow ejecta from the red-giant or asymptotic giant branch phase of evolution of the central star is distributed smoothly. We consid...

J.E. Dyson, T.W. Hartquist, M.P. Redman, R.J.R. Williams in Astrophysics and Space Science (2000)

Article

Truncated Collimated Flows in Abell 30, Abell 78 and the Honeycomb Nebula

Localised collimated flows of ionized gas are found in two hydrogen deficient planetary nebulae, Abell 30 and Abell 78 as well as in the Honeycomb complex of interlocking shells in halo of 30 Dor in the Large ...

J. Meaburn, M.P. Redman, M. Bryce, J.A. López… in Astrophysics and Space Science (2000)

Article

Structure and Stability of Ionization Fronts

The study of the dynamics of ionization fronts has moved far since Franz Kahn helped define the field in the 1950s. Nevertheless, the stability of the fronts and the nature of elephant trunks and bright rims i...

R.J.R. Williams, J.E. Dyson, K. Pavlakis in Astrophysics and Space Science (2000)

Article

Some Recent Results on MHD Shocks and Winds

Work on the rotation of the magnetic field around the shock propagation direction in an oblique shock in a dusty medium is reviewed. A significant observational consequence is that the rotation lowers the mini...

T.W. Hartquist, J.E. Dyson, R.J.R. Williams… in Astrophysics and Space Science (2000)

Article

A laboratory evaluation of two brands of disposable air turbine handpiece

Objective: To report on the essential performance characteristics of two brands of disposable air turbine handpiece and on aspects of their safety and convenience for clinical use.

J E Dyson, B W Darvell in British Dental Journal (1997)

Article

Introduction

J. E. Dyson, F. D. Kahn in Astrophysics and Space Science (1996)

Article

Flows in clumpy planetary nebulae

The dynamics of clumps observed in planetary nebulae are considered. The possibility that SiO maser spots in evolved stars and the planetary nebula clumps are formed by the Parker instability behind shocks in ...

T. W. Hartquist, J. E. Dyson in Astrophysics and Space Science (1996)

Article

Line forming regions in active galaxies and their nuclei

The spectra of active galaxies and their nuclei are rich in emission and absorption line features. A major aim of present research is the development of self-consistent hydrodynamic models for the production o...

J. E. Dyson, R. J. R. Williams, J. J. Perry in Astrophysics and Space Science (1996)

Article

Wide intermediate scale structures in mass-loaded flows

We showed in earlier work that a clump embedded in tenuous plasma, which is flowing subsonically relative to the clump, will develop a long thin tail whether the gas in the tail behaves adiabatically or isothe...

T. W. Hartquist, J. E. Dyson, R. J. R. Williams in Astrophysics and Space Science (1996)

Article

All's knot quiet on the recombination front

Molecular clouds are clumpy on length scales down to the limits of observational resolution. At least some ultracompactHii regions (UCHiiR) may result from the interaction of a young early type star and this type...

M. P. Redman, R. J. R. Williams, J. E. Dyson in Astrophysics and Space Science (1995)

Article

Flows and shocks in active galaxies and their nuclei

Observations of active galactic nuclei imply that shocks must be an essential and important part of their structure. We outline the basic observations, and discuss those features which must be addressed by any...

J. E. Dyson, R. J. R. Williams, J. J. Perry in Astrophysics and Space Science (1995)

Article

An evolutionary model for the wolf rayet nebula NGC 2539

The main outer ring of the WR nebula NGC 2539 expands radially with velocity ≈ 26kms⁻¹. The dynamics are modelled as the interaction of the winds from the O progenitor and the present WR stage with clumpy molecul...

J. Meaburn, J. E. Dyson, C. D. Goudis… in Astrophysics and Space Science (1994)

Article

Highly supersonic molecular flows in wind-clump boundary layers

The gradual acceleration, through viscous coupling to a wind, of molecular hydrogen in turbulent boundary layers around obstacle clumps is proposed to be responsible for the widths of the emission features wit...

M. T. Malone, J. E. Dyson, T. W. Hartquist in Astrophysics and Space Science (1994)

Article

Editorial note

J. E. Dyson in Astrophysics and Space Science (1993)

Article

Book reviews

J. E. Dyson, J. Kleczek, Fred Hoyle in Astrophysics and Space Science (1989)