Edited by Samuel S. Epstein, with associate editors: Joshua Lederberg [and others] / "Based on a symposium cosponsored by the Center for Studies of Narcotic and Drug Abuse, NIMH, and by the Environmental Mutagen Society, San Francisco, October 29 and 30, 1969." / Includes bibliographies.

A thesis submitted to the Faculty of Humanities, University of the Witwatersrand, Johannesburg, in fulfilment of the requirement for the degree of Doctor of Philosophy, March, 2017. / This thesis examines how African journalists negotiate the tension between their understanding of journalism and the actual practice of journalism within the context of Chinese media organisations based in Africa. Adopting the Shoemaker and Reese (1996) hierarchy of influences model and using interviews with African journalists in Kenya and content analysis, I examine this tension within the framework of the relationship between role conception and role performance. China has framed its media expansion into Africa on the premise that it aims to tell the ‘true African story’ to global audiences. This is consistent with China’s Africa policy promising mutuality and equality between China and Africa. However, the findings indicate an African and a Chinese level of gatekeeping and journalistic agency exist within Chinese media organisations based in Africa. These levels often coexist, but they also collide, resulting in Chinese interests and ideas prevailing over those of African journalists, and often in a type of journalism that de-emphasises African belonging and identity. This study represents an original contribution to the debate on the relationship between role conception and role performance, from a non-western perspective. It demonstrates the ways in which the relationship between role conception and role performance within Chinese media organisations in Africa is hinged upon conditional autonomy in relation to the typology of stories. The elements of the hierarchy of influences model are more active when Chinese interests are present in a story than when they are absent. Consequently, the editorial policy of ‘positive reporting’ promoted by Chinese media organisations is more active in the coverage of activities related to China than non-China content. This thesis enriches the five levels of analysis in Shoemaker and Reese’s hierarchy of influences model. This study proposes language as a level of influence straddling media routines and organisation influences, when applied to Chinese media organisations in Africa. This thesis also contributes to the ideologisation debate on Chinese media expansion into Africa. While the debate has been dominantly framed through the Manichean prism of positive or negative, this thesis proposes Chinese media expansion into Africa will result in a hybrid form of journalism professionalisation in which Western and Chinese journalistic traditions co-exist on the continent. / XL2018

QC 351 A7 no. 30 / This symposium was co- sponsored by the Kitt Peak National Observatory (Dr. D. L. Crawford) and the Optical Sciences Center and Steward Observatory of the University of Arizona (Dr. A. B. Meinel). The idea grew from the recognition of the many common problems that were being faced by national and international groups in the engineering of large telescopes. The divergences of opinions and designs in regard to the nature of large astronomical mirrors, and their mounting and testing, made it evident that an exchange of ideas would be profitable to all of the groups. The meeting was organized and chaired by D. L.Crawford and A. B. Meinel. Special commendation is also due to R. H. Noble of the Optical Sciences Center for managing the numerous arrangements that contributed to making this a well-attended and successful symposium. The original intent of the symposium was merely to provide a face-to-face exchange of ideas. In retrospect, however, it was realized that the meeting constituted a milestone in large telescope design, and it was decided to edit the recording tapes and publish the proceedings. The task of transcribing the tapes fell to Patricia Grames and Evelyn Brant, with assistance in technical content from Earl Pearson of Kitt Peak National Observatory. In several cases the presentations atthe symposium led to continuing discussion. In particular,the papers by Bleich and Schwesinger led to a spirited exchange in which considerable enlightenment resulted. We have decided not to include these supplemental contributions, both because they transpired outside the format of this meeting and in view of their intent to publish elsewhere. The editorial task undertaken by Martha Stockton was immense and was impeded by prior responsibilities of all the persons involved. We are pleased to now conclude the report. We hope that readers will find this volume a useful addition to the limited available works on the topic of the design and testing of large astronomical telescopes. A. B. Meinel D. L. Crawford

Dense media separation (DMS) plays an integral part in coal processing as well as in the upgrade of low grade ore bodies prior to further processing like flotation and leaching. Various separating vessels are used in DMS; of which the dense media (DM) cyclone is the most common. However, the limited materials of construction available for DM cyclones leave the industry with little choice. In addition, the DM cyclones available moved away from the basic principles of classification hydrocyclones which is to reduce the turbulence in the feed chamber in order to achieve improved efficiency. The ceramic tiled DM cyclones available in the market have ceramic tiles installed perpendicular to each other in the feed chamber, which increase the turbulence in the feed chamber at the expense of longer equipment life. For that reason, a research project was initiated to establish the current installed base of DM cyclones in Southern Africa and to develop and evaluate a DM cyclone with a laminar spiral feed chamber design to reduce the turbulence when feeding the cyclone, whilst achieving the same or superior wear properties. Because Cavex is well proven in hard rock mining and coal classification, it was used as basis for the development of a DM cyclone. Individual moulds were developed and produced in order to fabricate a Cavex DM cyclone with the exact laminar spiral feed chamber that exists when moulded out of rubber. Afterwards, the Cavex ceramic tiled (CVXT) cyclone was manufactured, installed and commissioned. Using the basic operating principles of hydrocyclones, the predicted results were achieved. The 650CVXT results confirmed that a DM cyclone and a classification cyclone are inherently the same piece of equipment; it is the selection criteria and material of construction that differ. There is a definite benefit in focussing on metallurgical efficiency in conjunction with wear properties, rather than equipment life (wear life) as the only parameter during equipment fabrication. A simple way to achieve improved performance is to reduce the turbulence in the feed chamber. Further work must include the evaluation of the Cavex CVXT DM cyclone in near gravity coal circuits and to investigate whether the same lower operating pressures (6D compared to conventional 9D) will result in improved coal yield, as was illustrated successfully in the separation of fluorspar by DMS, whilst achieving the desired ash contents. The work must include detailed studies on the effect of feed pressure vs. yield/recovery, when the turbulence the feed chamber is reduced. Overall energy savings should be quantified by reducing the cyclone feed pressure.

Until a few years ago, it was widely held that, ‘apartheid cannot be reformed, it can only be destroyed’. Today, all participants in the negotiation process are agreed that one fundamental characteristic of the social order must be preserved: the new South Africa is to be a capitalist society; the productive wealth of the country will be the private property of a small number of capitalists, and the vast majority will try to sell their labour for a wage to capitalists who will buy it only when that labour can contribute to their profits. There is still disagreement about how small or large the number of capitalists will be; about the colour of their skins; about who they will appoint to manage their mines, banks, factories and farms for them; about the rules that will govern disputes over wages; and above all about the use that the state will make of the taxes paid from their profits. There is also disagreement about the extent to which capitalism can afford to meet popular needs. But all of these disagreements take place within the framework of a common belief that the future is capitalist. The aim of this seminar series, held by the Marxist Theory Seminar at the University of the Western Cape in April/May 1993, was to pose the question: What are the limits of social reform in a capitalist South Africa? Can the fundamental needs and aspirations of the vast majority of South Africans be met within a capitalist framework? Very often these questions are brushed aside with the argument that, given the present balance of local and international forces, there is no alternative to capitalism in SA today. Even if this argument is correct, it still remains necessary to ask what can be achieved within the framework of the capitalist society to which there is no alternative. If that question is not posed in the most rigorous way, all kinds of illusions will be created about what the future holds in store for us. The question of the limits of capitalist reform in SA is posed as it concerns five different areas; democracy, education, economic growth and employment, land and the oppression of women. What will democracy mean in a new SA which depends on foreign investment and capitalist profitability? Can the education crisis be resolved while meeting the needs of capitalist growth? Will economic growth take place in a capitalist SA, and will this lead to the creation of jobs and a higher standard of living for the majority? Can land be restored to the dispossessed, the virtual slavery of millions of farm workers ended, and land used in a way that produces food for all? What are the prospects of ending the oppression of women in a capitalist South Africa? MTS does not believe that there are simple answers to these questions. Certainly, these questions cannot be answered by a general condemnation of the inequality and inhumanity of capitalism. In each case, it is necessary to give clear answers to such questions as: Has capitalism served historically to support the struggle for democracy or to oppose it? How has it affected education in SA? What are the present interests of the capitalists in solving the land question, or giving women control of their lives? To what extent can capitalism be forced to make concessions - to provide jobs, for example - by the struggles of the oppressed? In the past, capitalism has shown itself to be much more flexible than its critics have supposed. That does not mean that capitalism can do anything it likes, nor that the working class can force it to meet whatever demands it has. One of the indispensable insights of Marxism is that processes of social change are not determined by the intentions or integrity of political leaders, but rather by the fundamental relationships of society and the ability of the major classes to pursue their interests created by these relationships. We hope that the publication of this seminar series contributes to making this insight available to a wider audience. / Marxist theory seminar

The cross-flow past a pair of equal-diameter circular cylinders, arranged in a staggered configuration, was investigated experimentally in a closed-circuit water tunnel at Reynolds numbers, based on the mean-flow velocity and the cylinder diameter, within the lower subcritical range. The wake formation process was studied employing dye-injection flow visualization and hot-film measurements. The main emphasis was placed on acquiring a physical understanding of the mechanisms leading to vortex shedding, and particularly on the effect of a forced oscillation transverse to the flow direction of either of the two cylinders. For comparison purposes, investigations were also carried out with both cylinders stationary. / Experimental results showed that, for a reasonably large angle of incidence, the flow in the wake of a stationary cylinder pair could be characterized by two distinct periodicities, each of which was dominant on one side of the wake. Furthermore, for lower Reynolds numbers (Re < 1.0x10 4), there was an integral relationship between the two Strouhal numbers, but this integral relationship was no longer maintained for Re > 1.0x10 4. On the other hand, the flow around stationary cylinders for a small angle of incidence was characterized by a single Strouhal number, which remained approximately constant over the entire Reynolds number range. / For all the cylinder configurations investigated the wake flow patterns remained essentially the same as those of the corresponding static cases, when either of the two cylinders was forced to oscillate with a nondimensional forcing frequency less than approximately 0.10. However, beyond this value, the wake underwent considerable modification vis-a-vis when the cylinders were stationary, and the flow pattern within the wake was strongly dependent on the value of the forcing frequency. In particular, there were distinct regions of synchronization between the dominant wake periodicities and the cylinder oscillation; these synchronization regions involved sub- and superharmonics as well as fundamental synchronizations. With either upstream or downstream cylinder oscillation, the wake on the mean-flow side of the downstream cylinder synchronized with the shear layers separated from its outer surface, whereas synchronizations on the mean-flow side of the upstream cylinder were caused by the periodicities formed from the interaction of the other three shear layers. / The flow phenomena associated with the synchronizations were described in detail via flow visualization. The organization of the wake was strongly dependent on whether it was the upstream or downstream cylinder which was oscillating. The synchronized wake on the mean-flow side of the downstream cylinder at both lower and higher oscillation frequencies for upstream cylinder oscillation was observed to form either by the shedding of independent vortices or by the coalescence of two or more vortices. However, for downstream cylinder oscillation, although the synchronizations on this side of the wake at lower oscillation frequencies were caused by the shedding of independent vortices or by the coalescence of vortices, those at higher oscillation frequencies were the consequence of the coalescence of vortices only. For large incidence angles, the number of shear layers separated from the downstream cylinder which interacted with those separated from the upstream cylinder was critical in causing the synchronizations on the mean-flow side of the upstream cylinder. / In most cases, the flow for all the cylinder configurations traversed between the same patterns as those obtained when the cylinders were placed stationary at their minimum and maximum transverse spacings; but there were also some situations where the oscillation of either cylinder pushed the flow outside the regimes associated with the stationary configurations. The synchronization ranges obtained when the upstream or downstream cylinder was oscillating were different from each other, and these ranges were much wider than the corresponding synchronization ranges for a single oscillating cylinder. For two cylinders, an analysis of the fundamental synchronization showed that the frequency range over which this occurred was much broader for upstream cylinder oscillation than for downstream cylinder oscillation. Also, the fundamental synchronization ranges for downstream cylinder oscillation were closer to those for single cylinder oscillation in comparison to those for upstream cylinder oscillation.

Thesis (S.T.L.)--Catholic University of America, 2006. / Includes bibliographical references (leaves 138-149).

Thesis (Ph. D.)--Johns Hopkins, 1928. / Vita. "The substance of this study was presented in a series of six lectures delivered before the Political science department of the Johns Hopkins university in April and May, 1928"--Pref. Published also as Johns Hopkins university studies in historical and political science. Extra volumes, new ser., no. 6.

Thesis (D. Miss.)--Trinity Evangelical Divinity School, Deerfield, Ill., 1998. / Abstract. Includes bibliographical references (leaves 211-218).

Thesis (S.T.L.)--Catholic University of America, 2006. / Includes bibliographical references (leaves 138-149).