Sobol, and seminar participants at the September 1999 Brookings Panel for helpful comments. Scott Nicholson has provided excellent research assistance. The views expressed here are those of the authors, and do not necessarily reflect those of the Federal Reserve Bank of New York, the Federal Reserve System, or any other institution with which the authors are affiliated.

Copperde¢ciency in potatodextroseagar causes reduced pigmentation in culturesof variousfungi Garth W. Griffith, Gary L. Easton, Andrew Detheridge, Kevin Roderick, Arwyn Edwards, Hilary J. Worgan, Jean Nicholson & William T. Perkins Institute of Biological Sciences, Aberystwyth University, Penglais, Aberystwyth, Ceredigion, Wales, UK; and Institute of Geography and Earth Sciences, Aberystwyth Un...

Pressure correction schemes and the method of characteristics are combined to obtain numerical approximation procedures for incompressible Navier-Stokes ows on massive parallel computers. The projection step is carried out with a new more eecient parallel preconditioned conjugate gradient method and for the computation of the characteristics we use a fast local Crank-Nicholson solver for linear...

Both authors thank Bill Warburton of the BC Ministry of Social Development and Economic Security for helpful discussions on the issues covered in this paper. Smith thanks the members of the HRDC Medium Term Indicators Advisory Panel, in particular Walter Nicholson, for useful discussions as well.

Z A Aziz, A U Wells, D M Hansell, G A Bain, S J Copley, S R Desai, S M Ellis, F V Gleeson, S Grubnic, A G Nicholson, S P G Padley, K S Pointon, J H Reynolds, R J H Robertson, M B Rubens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Turbidity measurements are inexpensive and can be performed rapidly and simply. Therc has bccn a necessity to develope a technique which could bc utiliscd with some degree of confidence to identify certain conditions rclatcd to potentially problcrnalic sugars. Nephelometric turbidity measurements were performed on a number of raw sugars and correlated with filterability dctcrmined routinely usi...

Abstract: In this paper, we study the Nicholson-type delay systems with patch structure and nonlinear density-dependent mortality terms. Under appropriate conditions, we establish some criteria to ensure the permanence of this model. Moreover, we give some examples to illustrate our main results.

We consider the fractional cable equation. For solution of fractional Cable equation involving Caputo fractional derivative, a new difference scheme is constructed based on Crank Nicholson difference scheme. We prove that the proposed method is unconditionally stable by using spectral stability technique.