Environmental sanitation in Nigeria: colonial and contemporary
The state's preoccupation with sanitation reached a peak in 1985 during the latter months of the Buhari regime. Environmental sanitation was chosen as the theme for the fifth phase of the war Against Indiscipline (WAI), which was launched in Kano on 29 July 1985 by the then Chief of Staff, Supreme Headquarters, Major-General Idiagbon. He announced that a one million naira prize would be awarded for the cleanest capital.
The Sanitation Syndrome: Bubonic Plague and Urban Native Policy in the Cape Colony, 1900–1909
Infectious disease and concepts of public health, operating as societal metaphors, seem to have exercised a powerful influence on the origins and development of urban segregation in South Africa. Between 1900 and 1904 bubonic plague, threatening major centres, occasioned the mass removal of African urban populations to hastily established locations at the instigation of medical authorities and other government officials under the emergency provisions of the public health laws. Inchoate urban policy, under tentative consideration since the 1890s as economic development and social change began to stimulate black urban migration, was precipitated by this episode into specific legislation and permanent administration. Cape Town and Port Elizabeth were the two foci of this development in the Cape Colony, where the government locations at Ndabeni and New Brighton exemplify the process. These moves and the effort to consolidate them were to a large degree frustrated by practical administrative, legal, economic and human factors which have characterized the anomalies and contradictions of urban location policy ever since. A black ‘middle class’ resisted the loss of property rights and clung to aspirations of economic and social mobility or legal independence. Especially at Port Elizabeth, where independent peri-urban settlements proliferated, white officials and politicians laboured in an administrative and legal quagmire. White employers and black migrants proved only marginally amenable to location concepts modelled on the principles of quarantine. But ‘the sanitation syndrome’, equating black urban settlement, labour and living conditions with threats to public health and security, became fixed in the official mind, buttressed a desire to achieve positive social controls, and confirmed or rationalized white race prejudice with a popular imagery of medical menace. These issues of urban social order would be repeated again in connexion with such dire events as the 1918 influenza epidemic as the foundations of Union-wide policy and law were laid during and after World War I.
Finite Difference Modeling on the Temperature Field of Substrate in Friction Surfacing
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. As a kind of thermal processing technology, the temperature profile and changes of the substrate in friction surfacing are important factors to get coatings of high quality. In this paper, the temperature field of the substrate during the process is simulated by finite difference method. The results are consistent with experiments, reappearing the temperature change of the substrate during friction surfacing, allowing further study on figuration and quality of coatings.