NSIS Volume 38 - Part 1
Permanent URI for this collectionhttps://hdl.handle.net/10222/15119
Browse
Recent Submissions
Item Open Access Table of contents (v. 38, p. 1)(Dalhousie Printing Centre, 1988-12) Nova Scotian Institute of ScienceItem Open Access A comparison of fungal floras of highland and lowland pastures in Iceland.(Dalhousie Printing Centre, 1988-12) Eyjollsdottir, G.; Olalsson, S.; Brewer, D.Fifty-four soil samples were collected during the summers of 1982 and 1983 from a reclaimed bogland (elevation 20 m = lowland) pasture at approximately 64°N, 21 °W and 40 soil samples were obtained in the same time period from a highland (elevation 474 m = highland) pasture at about 64°N, 19°W. The mean number of fungal propagules per gram of soil of the former was 5.3 x 105 and of the latter 2.9 x 105 and the difference was significant at the P< 0.001 level. The species present in the two floras were different. Gliocladium catenularum, Paecilomyces carneus and Pseudeurotium zonatum were present in more than 60% of the lowland soil samples and accounted for 21% of the total flora, but were not found in the highland pasture soil. Conversely, the most common species found in the highland soil Penicillium sp. 525 was not isolated from the lowland soil samples.Item Open Access Pyrolysis/magnetic separation; a process for reducing the sulphur content of eastern Canadian coals.(Dalhousie Printing Centre, 1988-12) Whiteway, S.G.; Stewart, I.; Chan, E.; Caley, W. F.; Adorjan, L.A.Elements of a process are described, whereby the high sulphur coals of eastern Canada may be converted into a low sulphur product suitable for coal-slurry fuels. The process envisaged includes thermal/magnetic benefication followed by aggregative flotation. On a laboratory scale the optimum conditions for these steps include vacuum pyrolysis at 475°C, and wet magnetic separation at a field strength of 1.6 x 10-5 A.m-1. A favourable tar yield also occurred at about 475°C for chars exposed to vacuum pyrolysis.Item Open Access Modelling the observed velocity of our galaxy relative to the cosmic microwave background(Dalhousie Printing Centre, 1988-12) Coley, A. A.; Tupper, B. O. J.The aim of this work is to model the observed velocity of our galaxy relative to the cosmic microwave background that was recently discovered by Smoot et al. A homogenous and isotropic,flat, relativistic two fluid cosmological model is considered in which two separate fluids act as the source of the gravitational field. In this model one fluid is a comoving radiative perfect fluid modelling the cosmic microwave background and the second a non-comoving imperfect fluid modelling the observed material content of the universe. The model that is obtained is represented as a solution of Einstein's equations and the laws of thermodynamics in which all the physical quantities occurring in the solution are suitably well behaved. In addition, the model is in good agreement with current observations.