New Releases by Sam F

Over the past twenty years our understanding of polymer solutions has undergone a dramatic evolution. New methods and concepts have extended the frontier of the theory from dilute solutions in which polymers move independently of each other, to concentrated solutions where many polymers entangle with each other. This book provides a comprehensive account of the modern theory for the dynamical properties of polymer solutions. This includes viscoelasticity, diffusion, dynamic light scattering and flow and electric birefringence. Nonlinear viscoelasticity is discussed in detail on the basis of molecular dynamical models. The book fills a gap between classical theory and modern developments and constructs a consistent picture for the dynamics of polymer solutions over the entire concentration range.

Uitgewerkte programma''s van een in moeilijkheidsgraad oplopend drietal adventurespelen. Vanaf ca. 13 jaar.

Uitgewerkte programma''s van een in moeilijkheidsgraad oplopend drietal adventurespelen. Vanaf ca. 13 jaar.

Verteld wordt hoe je zelf adventure-spellen voor je Commodore 64 huiscomputer kunt leren schrijven. Vanaf ca. 13 jaar.

Programma''s van spelen die geschikt zijn voor MSX computers. Vanaf ca. 12 jaar.

De listing van 30 programma''s met spelletjes met een korte inleiding voor de speler.

In a community of widely spaced perennials, mostly shrubs, in the cold desert of western Utah, total accumulated organic mass (excluding the small amount of humus) is about 1,770g./m.2. Of this total, 240 g. are above the ground and 1,530 g. below. Of the latter, 295 g. is underground litter. About half of the 1,235 g. of roots are in the surface 30 cm. of the soil, about 0.3 of them in the second 30 cm., 0.15 in the third, 0.03 in the fourth, and 0.01 of them occur below 120 cm. to about 135 cm. Coarce roots (u003e 2 mm. in diameter) are found only in the immediate vicinity of plants and are unimportant below the 15-cm. depth. Fine (