Political consciousness and political action of industrial workers in Ghana: a case study of Valco workers at Tema
What is the political consciousness of Ghanaian workers in large-scale foreign and state enterprises and what action have they engaged in? The present study, based on fieldwork in Ghana in 1975, attempts to answer these questions with regard to answer these questions with regard to industrial workers in a multi-national corporation at Tema, Valco (Volta Aluminium Company). Notes, ref., tab.
Power and Independence: Urban Africans' Perception of Social Inequality
1. Introduction 2. Social Rank in Traditional Yoruba Society 3. The Developing Social Structure 4. Social Mobility 5. Social Interaction 6. Yoruba Attitudes 7. An Overview
Ceramic microwave antennas for mobile applications
Due to their medium to high permittivity values, ceramic microwave materials are attractive as building blocks for miniaturised antenna solutions. Further advantages are low dielectric losses and an excellent temperature stability of standard ceramic materials. Yet, the permittivity of the ceramic material also has a strong influence on the radiation efficiency and bandwidth of the antenna. This implies that in the design process a suitable compromise has to be found between the degree of miniaturisation on the one hand and the antenna efficiency and bandwidth on the other. We describe two approaches towards efficient miniaturised ceramic microwave antennas: the dielectric resonator antenna (DRA) with partial metallisation and the shorting post patch antenna. We focus on design steps taken to ensure both a high degree of miniaturisation and high values of the radiation efficiency, the choice of the ceramic material and the experimental performance of the antennas.