منابع مشابه
Atmospheric trends of the halon gases from polar firn air
Atmospheric trends of the halon gases from polar firn air C. E. Reeves, W. T. Sturges, G. A. Sturrock, K. Preston, D. E. Oram, J. Schwander, R. Mulvaney, J.-M. Barnola, and J. Chappellez School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK Physics Institute, University of Berne, Berne, Switzerland British Antarctic Survey, Natural Environment Research Council, Cambr...
متن کاملImpurity-controlled densification: a new model for stratified polar firn
A new densification model, which simulates the effect of impurities on the densification of polar firn, is presented. The classical densification models of Herron and Langway (1980) and Pimienta and Barnola (Barnola and others, 1991) are modified by assuming that the activation energy for deformation is reduced by the impurities. Motivated by recent observations, the impurity effect is formulat...
متن کاملEstimating crystal growth rates using computed tomography
It has been observed that sugar crystals growing in solution exhibit growth rate dispersion, that is, variation in growth rate from one crystal to the next. We consider the problem of estimating the distribution of growth rates in batch-grown crystals, given only samples of their sizes at a number of fixed points in time. The problem can be expressed as a tomographic image reconstruction proble...
متن کاملPrecision Measurements of Ice Crystal Growth Rates
I describe techniques for making precise measurements of the growth rates of the principal facets of ice crystals. Particular attention is paid to identifying and reducing systematic errors in the measurements, as these have plagued earlier attempts to determine ice growth rates. I describe the details of an experimental apparatus we are currently using, and I describe some preliminary results ...
متن کاملCrystal size distribution in metamorphic rocks: an example for the relationship between nucleation and growth rates with overstepping
Crystal size distribution (CSD) in metamorphic rocks provide fundamental information about crystal nucleation and growth rate, growth time and the degree of overstepping. CSD data for garnet, staurolite, kyanite and andalusite crystals from the aureole demonstrate that the earliest formed of these minerals, garnet, has the highest population density and the shortest growth time. The last formed...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals of Glaciology
سال: 1993
ISSN: 0260-3055,1727-5644
DOI: 10.1017/s0260305500011526