The problem of accurate determination of the position, orientation and width of involute spur gear teeth using a single front-lit image is addressed. The information is used to compute global measures of tooth concentricity and pitch variations across a gear wheel. The approach is based on the use of specialised filters which make maximum use of the grey level information available in the image...

Abstract This paper examines African peasant tobacco production in Southern Rhodesia from 1900 to 1980, the cusp of colonialism its end. It analyses shifting state policy towards producers, concomitant impact on economies, accumulation patterns and rural physical landscape responses. focuses changing agricultural commodity value chains, cash crop asymmetries, global market forces explain coloni...

Family planning (FP) in rural China, particularly the ramifications of the 1-child policy, has profound implications and ramifications for family-centered social and economic life in addition to demographic control. Under a constitutionally endorsed policy of strict birth control, favorable economic opportunities coexisted with the problem of familial labor shortages. Recent reform policies h...

The purpose of this research is to establish the grounds for a critical social scientific analysis of mineral development based upon the case study of women in informal peasant gold mining or garimpagem1 in the Brazilian Amazon. Situated at the local/regional level of analysis, this case study illustrates the main tensions of contemporary mineral development. First, the region’s mineral develop...