Self-similar solution of a nonsteady problem of nonisothermal vapour condensation on a droplet growing in diffusion regime

This paper presents a mathematically exact self-similar solution to the joint nonsteady problems of vapour diffusion towards a droplet growing in a vapour-gas medium and of removal of heat released by a droplet into a vapour-gas medium during vapour condensation. An equation for the temperature of the droplet is obtained; and it is only at that temperature that the self-similar solution exists. This equation requires the constancy of the droplet temperature and even defines it unambiguously throughout the whole period of the droplet growth. In the case of strong display of heat effects, when the droplet growth rate decreases significantly, the equation for the temperature of the droplet is solved analytically. It is shown that the obtained temperature fully coincides with the one that settles in the droplet simultaneously with the settlement of its diffusion regime of growth. At the obtained temperature of the droplet the interrelated nonsteady vapour concentration and temperature profiles of the vapour-gas medium around the droplet are expressed in terms of initial (prior to the nucleation of the droplet) parameters of the vapour-gas medium. The same parameters are used to formulate the law in accordance with which the droplet is growing in diffusion regime, and also to define the time that passes after the nucleation of the droplet till the settlement of diffusion regime of droplet growth, when the squared radius of the droplet becomes proportionate to time. For the sake of completeness the case of weak display of heat effects is been studied.Comment: 12 pages, 4 figure

Including Women? (Dis)junctures Between Voice,

Abstract Integrated development plans (IDPs) are municipal strategic plans designed to bring about developmental local government. They have been criticised for providing insufficient space for democratic participation. This paper explores the extent to which a marginalised group—women—has been incorporated into the IDP process, in response to three questions. First, how have IDP participatory processes incorporated women’s voice, and are the new participatory spaces realising their transformative potential? Secondly, how have women’s interests and a gender perspective been mainstreamed in the IDP, and has it promoted transformation? And finally, at the interface between officials and women themselves, how are IDP projects implemented and does agency promote or impede the goals of gender equality? A study of three KwaZulu-Natal municipalities reveals some achievements, but unequal gender relations have not been transformed. These case studies demonstrate some of the complexities and difficulties in the practice of democratic governance

Is There Such a Thing as a Post-apartheid City?

In an introductory section, this paper considers briefly the achievements and problems of urban governance in post-apartheid South Africa through an assessment of three categories: administrative reform, developmental issues and conflicts over service delivery issues. It then goes on to assess continuity and change in South African cities. Continuity is the norm in understanding urban history with change understood as a series of accretions and as a layering of features, unless major economic shifts or revolutionary political shifts are in place. Using the example of Durban, a series of changes is highlighted, which fit into what the deracialized growth path allows and encourages. The paper argues that thus far, the ANC government has shown little capacity or desire to discipline capital along the lines suggested, for instance, by the reconstruction and development programme's section on public transport. Larger changes are thus limited by the predilections and established discourses of the business world and the absence of more dynamic and structured public intervention

Depression and Motivation

Among the characteristic features of depression is a diminishment in or lack of action and motivation. In this paper, I consider a dominant philosophical account which purports to explain this lack of action or motivation. This approach comes in different versions but a common theme is, I argue, an over reliance on psychologistic assumptions about action–explanation and the nature of motivation. As a corrective I consider an alternative view that gives a prominent place to the body in motivation. Central to the experience of depression are changes to how a person is motivated to act and, also as central, are changes to bodily feelings and capacities. I argue that broadly characterizing motivation in terms of bodily capacities can, in particular, provide a more compelling account of depressive motivational pathology

Contemporary South African Urbanization Dynamics

Abstract The paper provides an overview of urbanization patterns and trends in the current era in South Africa, focusing in particular on the key dynamics and driving forces underlying migration and urbanization. It considers overall demographic trends with regard to migration and urbanization, and points to some of the difficulties with data, and with the analysis of trends and patterns. The paper explores the changing rural context and dynamics, and some of the significant processes in this context: large-scale displacement of black people off farms, the impact of land reform, and conditions in the former homeland areas. Circular migration continues to be an important way in which households in rural areas survive, but some are unable to move, and are falling out of these networks. International migration—the consequence of both conditions in the home country and the draw of the South African economy— is another significant process fuelling mainly urban growth. The paper demonstrates the importance of cities in terms of economic growth and employment, and thus their attractiveness to migrants. Continuing migration to cities is of course a challenge fo

Organisms in experimental research

Rachel A. Ankeny and Sabina Leonell