21 Result(s)

Article

Instability of a Smooth Solid-Liquid Interface During Solidification

It is shown that the cellular substructure observed in binary alloy crystals grown from a melt of known concentration can be eliminated by the proper choice of growth conditions. For a given solute concentrati...

D. Walton, W. A. Tiller, J. W. Rutter, W. C. Winegard in JOM (1955)

Article

Geomagnetic intensity in Athens between 2000 BC and AD 400

MEASUREMENTS of the intensity in Athens of the geomagnetic field between 2000 BC and AD 400 are reported here. The material from which the intensity was determined consisted primarily of sherds from the Agora exc...

D. WALTON in Nature (1979)

Article

Time–temperature relations in the magnetization of assemblies of single domain grains

A theory for important magnetization processes such as magnetic viscosity and the production of a moment on cooling in a magnetic field is presented here. The results for viscous phenomena differ from those ob...

D. Walton in Nature (1980)

Article

Early archaeological sites, hominid remains and traces of fire from Chesowanja, Kenya

Recent investigations of Lower Pleistocene sites at Chesowanja have yielded in situ Oldowan and Oldowan-like stone artefacts, evidence of fire and a fragmentary ‘robust’ australopithecine cranium. Burnt clay foun...

J. A. J. Gowlett, J. W. K. Harris, D. Walton, B. A. Wood in Nature (1981)

Article

Errors and resolution of thermal techniques for obtaining the geomagnetic intensity

Techniques designed to obtain the intensity of the geomagnetic field by thermal demagnetization are subject to error due to differences between the ancient and laboratory cooling rate^1–3 and alteration in the phy...

D. Walton in Nature (1982)

Article

Viscous magnetization

The first test of a theory of viscosity has been possible using experimental results published recently by Dunlop¹. This has been accomplished by actually calculating the moment produced as a function of time and...

D. Walton in Nature (1983)

Article

Re-evaluation of Greek archaeomagnitudes

A new technique is used to determine the secular variation of the geomagnetic ancient field in Athens. The results indicate that published Greek archaeomagnitudes were seriously affected by alteration. It is s...

D. Walton in Nature (1984)

Article

Greek archaeomagnitudes (reply)

D. WALTON in Nature (1985)

Article

Improving the accuracy of geomagnetic intensity measurements

Many palaeomagnetists believe that, when properly measured, geomagnetic intensities can be obtained with a precision of better than 10% (R. S. Coe, personal communication). But published results do not appear ...

D. Walton in Nature (1987)

Article

Frame Relay to ATM interworking

Frame Relay is a well-established technology that has attracted a large number of customers world-wide. It is typically used to interconnect large, multi-site company local area networks (LANs). These data con...

D Walton in BT Technology Journal (1998)

Article

Argumentation Schemes and Enthymemes

The aim of this investigation is to explore the role of argumentation schemes in enthymeme reconstruction. This aim is pursued by studying selected cases of incomplete arguments in natural language discourse t...

D. Walton, C. A. Reed in Synthese (2005)

Article

Relationships Between Population Density and the Perceived Quality of Neighbourhood

Two overseas survey-based scales measuring perceived quality of neighbourhood were adapted and replicated in a New Zealand context. An Italian study (Bonaiuto, Fornara, and Bonnes. (2003). Landscape and Urban Pla...

D. Walton, S. J. Murray, J. A. Thomas in Social Indicators Research (2008)

Article

Poster presentations

T. Olds, S. Blunden, J. Petkov, F. Forchino, A. Teng… in Sleep and Biological Rhythms (2009)

Article

Attitudes towards public transport in New Zealand

Attitudes towards public transport (PT) in New Zealand’s three largest cities (Auckland, Wellington, and Christchurch) were examined in a cross-sectional survey of drivers. A measure of prejudice to PT was dev...

S. J. Murray, D. Walton, J. A. Thomas in Transportation (2010)

Article

The Influence of Simulated Home and Neighbourhood Densification on Perceived Liveability

This study experimentally manipulated neighbourhood density and home location to reveal the effect of these changes on perceived liveability. Two hypothetical scenarios were provided to 106 households using a ...

J. A. Thomas, D. Walton, S. Lamb in Social Indicators Research (2011)

Article

The Large Observatory for X-ray Timing (LOFT)

High-time-resolution X-ray observations of compact objects provide direct access to strong-field gravity, to the equation of state of ultradense matter and to black hole masses and spins. A 10 m²-class instrument...

M. Feroci, L. Stella, M. van der Klis, T. J. -L. Courvoisier… in Experimental Astronomy (2012)

Article

On-Orbit Degradation of Solar Instruments

We present the lessons learned about the degradation observed in several space solar missions, based on contributions at the Workshop about On-Orbit Degradation of Solar and Space Weather Instruments that took...

A. BenMoussa, S. Gissot, U. Schühle, G. Del Zanna, F. Auchère, S. Mekaoui… in Solar Physics (2013)