It is important for historians studying West Africa before the sixteenth century, particularly social and economic historians, to know what the basic foods were before the arrival of crops from the Americas such as maize, cassava, ground nuts, red peppers and tomatoes. Medieval Arabic historians and geographers recorded a great deal of information about social and economic life in Africa during the period and this is a full-scale attempt to make use of the material related to foodstuffs and the preparation of the food. The references collected from the Arabic texts are interpreted in the light of the work of modern ethnographers and the descriptions given by travellers in more recent times.
Mining activities may result in rock mass deterioration and instability that may lead to failure both in underground and open pit mines. Such deterioration represents a safety risk and may result in f
Surface Engineering of Metals provides basic definitions of classical and modern surface treatments, addressing mechanisms of formation, microstructure, and properties of surface layers. It discusses
Correctly functioning evaluation systems directly influence the efficient and effective planning and implementation of projects and the achievement of organisational objectives. This book critically a
This book addresses the realization problem of positive and fractional continuous-time and discrete-time linear systems. Roughly speaking the essence of the realization problem can be stated as follow
This monograph covers some selected problems of positive and fractional electrical circuits composed of resistors, coils, capacitors and voltage (current) sources. The book consists of 8 chapters, 4 a
Tadeusz Borowski's concentration camp stories were based on his own experiences surviving Auschwitz and Dachau. In spare, brutal prose he describes a world where the will to survive overrides compassi
