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The behaviour of the elements Ni, Co, Cu, Pb, Zn, Au, Ag, Mo, Sn, W and U in the magmatic, hydrothermal, sedimentary and weathering environments

  • Authors: Anderson, J R
  • Date: 1979
  • Subjects: Elements , Environment , Ore deposits , Classification , Geochemistry , Crystal chemistry
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4896 , http://hdl.handle.net/10962/d1001555
  • Description: In the last two decades much has been published on the behaviour of certain elements in the magmatic , hydrothermal, sedimentary and weathering environments , but the information is scattered throughout the literature . This situation prompted the present study on the elements Ni, Co, Cu, Pb , Zn , Au, Ag , Mo , Sn, W and U. The behaviour of the elements Ni, Cu, Pb , ZN, Au, Sn , W and U has been studied experimentally in some depth. Ag has been moderately studied, but there is very little information about Co and Mo. Studies on the complexes formed by the elements within the hydrothermal and aqueous environment are often inconclusive and controversial , but conclusions are drawn as to the more likely complexes formed . A genetic classification of ore deposits is used as a framework for the discussion . The source of the elements is regarded as being the mantle, and therefore discussion on other possible sources is beyond the scope of this dissertation. The crystal chemistry and geochemistry of the elements are presented and the essay concludes with a discussion on the elements within their depositional environments
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  • Date Issued: 1979

Symbolism and imagery in the story of Cupid and Psyche in Apuleius' Metamorphosis

  • Authors: Beattie, Shannon Boyd
  • Date: 1979
  • Subjects: Apuleius. Metamorphoses
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:3625 , http://hdl.handle.net/10962/d1009511
  • Description: A study of the story of Cupid and Psyche within the context of the Metamorphoses as a whole reveals a recurrent pattern of themes, motifs, and images, which indicates that the story symbolises the experiences of Lucius. The Judaeo-Christian Greek meaning of psyche, oneself, implies that Psyche is a symbol of Lucius. This is borne out by the similarity of their experiences, and by the fact that they both have the same character traits of simplicitas and curiositas. Cupid's warnings to Psyche concerning the control which Fortuna has over her life further establish the connection between Psyche and Lucius, whose life is controlled by blind Fate. Military imagery, and images of light and dark, which occur in connection with Cupid and Psyche, also describe the experiences of Lucius. Venus symbolises Isis, as is indicated by Isis' identification of herself as Venus, in addition to many other deities, at the end of the Metamorphoses. Once again imagery, this time of the sea, makes this relationship clear, while military imagery implies a parallel between the relationship of Psyche and Cupid, and that of Lucius and Fotis. Jupiter intervenes in Psyche's misfortunes, just as Isis saves Lucius from his hardships. Juno and Ceres are also identified with Isis at the end of the Metamorphoses, thus linking the story of Cupid and Psyche with the life of Lucius.
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  • Date Issued: 1979

Gold mineralization in archaean cherts and iron-formations a review of the economic geology

  • Authors: Bellamy, R E S
  • Date: 1979
  • Subjects: Gold ores -- Geology -- South Africa , Gold mines and mining -- South Africa , Greenstone belts -- South Africa
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4968 , http://hdl.handle.net/10962/d1005580 , Gold ores -- Geology -- South Africa , Gold mines and mining -- South Africa , Greenstone belts -- South Africa
  • Description: The distribution of gold in igneous rocks and minerals is described and discussed. Not all the gold in igneous rocks is contained within early formed crystal lattices. Evidence that gold can be associated with late stage crystallizing phases is described. It is concluded that some of the gold in hydrothermal and volcanogenic deposits may have come from a primary magmatic source rather than having been leached from solid country rock. Gold is probably transported as chloride complexes at temperatures greater than about 300°C. At lower temperatures it is probably transported with other metals as sulphide and thio-sulphide complexes. The precipitation of gold from the transporting medium is brought about by changes in the physico-chemical conditions within that medium. Decrease in pressure is probably not a major cause of precipitation in volcanogenic environments. The geology of volcanogenic iron-formations is described and discussed, relative to the development of greenstone belts. Oxide facies iron-formations were formed in shallow oxidizing environments. They are associated with volcanogenic and clastic sediments. Sulphide facies iron-formations were precipitated in the deeper parts of geosynclinal structures. They are associated with mafic and ultramafic rocks similar to modern oceanic volcanic assemblages. Carbonate facies iron-formations were deposited in the regions between oxide facies and sulphide facies. Other banded iron-formations are found associated with base metal massive sulphide deposits related to arctype volcanic centres. These deposits are found in the regions where carbonate facies iron-formations were formed. Exploration for and exploitation of gold deposits in Archaean iron-formations are discussed. Geochemical exploration programmes are aided by the association of gold with trace amounts of base metals. Geophysical exploration methods that can be employed include magnetometer, I.P. and E.M. surveys. The metallurgical treatment of the ores should include "roasting" because a large proportion of the gold occurs as submicroscopic grains within sulphide mineral crystals.
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  • Date Issued: 1979

The nouvelles of Henry James : a phenomeno-generic approach

  • Authors: Bijker, Antony Jan
  • Date: 1979
  • Subjects: Novelists, American -- 19th century -- Diaries , James, Henry, 1843-1916 -- Notebooks, sketchbooks, etc. , James, Henry, 1843-1916 -- Diaries
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:2168 , http://hdl.handle.net/10962/d1001819
  • Description: From Introduction: The present work is about the nouvelles of Henry James and not about phenomenology. That is to say that I am more concerned with James's use of the form of the nouvelle than with the illustration of a method. But, as Roland Barthes has pointed out: "How can we tell the novel from the short story, the tale from the myth, suspense drama from tragedy ... without reference to a common model? Any critical attempt to describe even the most specific, the most historically orientated narrative form implies such a model. "I Hence, because phenomenology is somewhat alien to the Anglo-American critical sensibility, I must temporarily reverse this emphasis and discuss the phenomenological "model" that underlies my investigation of James and the nouvelle form. Elsewhere phenomenological theory will take precedence only when it throws light on what is a highly elusive genre.
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  • Date Issued: 1979

A review of the economic geology of tungsten

  • Authors: Bowles, Michael
  • Date: 1979
  • Subjects: Tungsten Geology, Economic
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4897 , http://hdl.handle.net/10962/d1001556
  • Description: A description of the geochemistry of tungsten is given. The geochemical properties of tungsten have a strong influence on its mineralogy, distribution and abundance in crustal rocks and rock-forming minerals , and its migration/deposition within the ore-forming and supergene environments. The behaviour of tungsten during migration, from source to site of deposition, within the crust is discussed in some detail and environments considered favourable to the concentration of tungsten ore minerals are suggested. All major types of tungsten ore deposit are described with emphasis placed on those of greater economic importance. Characteristic features of each type of deposit are particularly emphasized in order to provide clear guidelines to exploration. Hydrothermal, pyrometasomatic and stratabound tungsten deposits present themselves, economically, as the most important exploration targets. The recently developed concept of syngenetic stratabound tungsten mineralisation is outlined. Exploration for deposits of this type should be aimed predominantly, but not exclusively, at volcano-sedimentary sequences of Lower Palaeozoic age, particularly within regions known to contain occurrences of Sb and Hg. Tungsten deposits commonly contain concentrations of one or more of the following metals: Sn, Sb, Bi, Mo, Au and Ag. The presence and possible extractive value of these metals, together with commonly associated metal impurities such as As, must always be taken into account in a feasibility study , Adobe Acrobat 9.53 Paper Capture Plug-in
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  • Date Issued: 1979

Narrative technique in ʹBeowulfʹ

The incorporation of certain psychological and sociological perspectives into social work intervention : a general systems approach

  • Authors: Collins, Anton Daniel
  • Date: 1979
  • Subjects: Sociol service -- Psychological aspects Social service -- Sociological aspects
  • Language: English
  • Type: Thesis , Masters , MSocSc
  • Identifier: vital:685 , http://hdl.handle.net/10962/d1002010
  • Description: In this dissertation the use of general systems theory as an aid to knowledge building, and the refinement of intervention in social work, is investigated. It is held that the social work view of man, and the profession's declared objectives, determine a structure and function for the client.which cause the social worker to resort to psychological and sociological perspectives in his intervention programme. However, the two disciplines concerned formulate their respective perspectives without regard to each other. The disparity between these perspectives present problems when they are incorporated into social work knowledge. The latter, as it is, is characterized by an unco-ordinated body of suppositions, facts, thoughts and theories. The social work literature on the use of the systems approach displays a lack of detailed description of general systems theory and the open living system. Because of this shortcoming it was decided to pay particular attention to general systems theory and the concept of the open living system. Since a system's view of man forms a firm basis for the appreciation of systems theory in psychology and sociology it was decided to include such a consideration. Following on this is an analysis of two perspectives held to be particularly relevant to social work, viz. the personality system and the social system. This leads finally to a description of the social work client as a system, as a sub-system and as a supra-system. Provision is made for the incorporation of psychological and sociological perspectives in social work intervention. It is subsequently concluded that the application of general systems theory has advantages for social work. It facilitates the incorporation of perspectives for psychology and sociology without distortion, promotes the integration and consolidation of social work knowledge, and brings the discipline into relation with the disciplines of psychology and sociology
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  • Date Issued: 1979

A review of landscape development and erosion cycles in southern Africa

  • Authors: Corbett, Dudley Harold
  • Date: 1979
  • Subjects: Landscape changes -- Africa, Southern Erosion -- Africa, Southern
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4899 , http://hdl.handle.net/10962/d1001558
  • Description: The study of landforms has, to a large extent been neglected by exploration geologists. This is surprising because field geology is intimately related with landforms of one type or another. An understanding of the geomorphological history of a particular area will assist in the appreciation of the surficial environment, the processes of weathering, soil formation and duricrust (calcrete , ferricrete silcrete) formation. This has direct application in planning and interpreting geochemical sampling programmes. In order to understand the evolution of landforms it is necessary to study slope development in some detail. Agents of erosion and denudation constantly at work, remove detritus from hillcrests down to the drainage lines which form the local base level from whence material is transported down to the sea. The system is one of dynamic equilibrium, and the concept of grade is important in understanding hillslope evolution. Thus Section (1) of this discussion deals with past and present theories of hillslope evolution. Very little work has been done recently on the geomorphology of Southern Africa and the presently accepted classification of land surfaces is based on the work of Prof. L.C. King (numerous publications). However, through the more recent work of De Swardt and Bennet (1974) on the geomorphology of Natal, it is apparent that the present system of landform classification in Southern Africa requires widespread revision. The relationship of erosion cycles in Southern Africa to the late Jurassic-early Cretaceous break-up of Gondwanaland has received insufficient attention in the past. Erosion cycles bear an intimate relationship to offshore Cretaceous and Tertiary-Recent sedimentation. Valuable information on these sediments has only recently become available as a result of offshore exploration for oil. The findings of De Swardt and Bennet (1974) are summarized in Section (2) and the present land surface classification of Southern Africa is reviewed. Finally, some suggestions on a new interpretation of land surfaces in Southern Africa are given.
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  • Date Issued: 1979

Protest in fiction : an approach to Alex la Guma

  • Authors: Cornwell, David Gareth Napier
  • Date: 1979
  • Subjects: La Guma, Alex , South African literature (English) -- Black authors -- History and criticism , Protest literature, South African (English) -- History and criticism
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:2169 , http://hdl.handle.net/10962/d1001820
  • Description: From Introduction: Thus for the black South African, the act of creative writing is inescapably a form of political action, and unless he turns his back on the reality which confronts him and retreats into a private imaginary world, it is also a form of social action, Yet Ezekiel Mphahlele has rightly cautioned that "creating an imaginary world" can never be an effective substitute for social act ion . Composing fictions about social and political problems is an indubitably oblique way of seeking a solution to them, and even the tendentious recreation of reality is only a metaphor for its actual transformation. Protest writing in South Africa is paradoxically a form of social action which is also only a parasitical imitation of social action, and therefore its avoidance . The freedom of literary creation described above is ambiguously not only a freedom to express reality, but also a freedom from the constraints of reality. And this suggests why the outlaw was such an important symbol to an earlier generation of rather more self-conscious writers.
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  • Date Issued: 1979

The development of an improved coded-pulse, vertical-incidence ionosonde

  • Authors: Cretchley, Brian Brind
  • Date: 1979
  • Subjects: Ionosondes Ionospheric sounds Computer simulation
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5436 , http://hdl.handle.net/10962/d1001989
  • Description: This thesis describes the theoretical development of a new ionospheric sounding system. The different types of ionosonde, their prime objectives, and their relative merits and demerits are discussed. The various types of code and their correlation functions are described. The essential requirements of the new system are listed, and suitable codes are found for it. Computer calculations and mathematical derivations demonstrate the (theoretical) suitability of these codes under all conditions. Essentials of the mode of operation of the system and details of its design are specified, and computer simulations are used to examine relevant aspects of its operation. Finally, since the construction of the system is not complete and results cannot therefore be presented, the present state of construction of the system is described
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  • Date Issued: 1979

Time and tense in English

  • Authors: De Klerk, Vivian A
  • Date: 1979
  • Subjects: English language -- Tense -- Study and teaching , English language -- Adverbials -- Study and teaching , Language and logic -- Study and teaching , Linguistics -- Study and teaching , Generative grammar -- Study and teaching
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2344 , http://hdl.handle.net/10962/d1002626 , English language -- Tense -- Study and teaching , English language -- Adverbials -- Study and teaching , Language and logic -- Study and teaching , Linguistics -- Study and teaching , Generative grammar -- Study and teaching
  • Description: It has not been my aim to provide conclusive evidence for or against anyone hypothesis regarding Time and Tense. I have simply attempted to collect together and collate much of what has been written on the topic of tense in English, in order to show what the current trends of thought are. In Chapter One I presented a brief survey of some of the more basic notions associated with time and tense, in order to provide a background for the more linguistic approach to follow. I therefore examined such issues as the difference between time and tense, the problem of the passage and directionality of time, of the present moment, time and space , tense as a universal, "and various features of tense systems. I sketched Bull's system of scalars, vectors and axes as representative of our English tense system. Chapter Two dealt with time and logic, but as I am a mere layman in matters logical, I refrained from discussing any individual logical system in depth, and rather discussed various problems which appear to confront the logician in formulating a tensed or tenseless logic. This chapter aimed at providing a better understanding of the linguistic issues to follow, for time and logic are intimately connected with language. Chapter Three was more linguistically oriented, and in it I attempted to provide a broad outline of the development of thoughts about tense before the Transformationalist period (pre 1960). Because of the vast scope involved, I had, perforce, to be brief at times. I gave attention to tense in classical grammatical studies, and summarized how it was seen from about 1500 to 1800. I gave more detailed treatment to the twentieth century, focussing specifically on grammarians like Jespersen (1933), Twaddell (1960), Ota (1963), Palmer (1965) and others - all, writers typical of the structuralist era. At the end of Chapter Three I provided an overall summary of ideas on the main tenses by the end of the structuralist period - ideas which were to change radically within the next few years. In Chapter Four I discussed the ideas of tense of some of the main transformationalist/generativists - Diver (1964), Crystal (1966), Huddlestone (1968), Gallagher (1970), McCawley (1971) and Seuren (1974), in an attempt to show how theories on tense were becoming increasingly abstract, and how most data indicated that it is highly probable that tense is an abstract higher predicate of the sentence in which it appears in surface structure, closely related to temporal adverbs. Chapter Five continued in the same vein. I tried to show, using syntactic tests, that tense is a higher predicate, and used arguments involving Conjunction Reduction (based on Kiparsky (1968)), VP Constituency, Sequence of Tense, Pronominalization, and Quantification. In Chapter Six I focussed more closely on tense-time adverbials, in order to show that they have the same syntactic properties as tense, are also probably deep superordinate predicates, and are closely related to tense. My suggestion was that either tense is derived from temporal adverbs or vice versa, as this would simplify the grammar. The derivation procedures at the end of the chapter (6.8) were largely based on Hausmann (1971). I made no detailed reference to extralinguistic matters which affect tenses, in this study - such factors as are diScussed by G. Lakoff (1971) (presuppositions and relative well-formedness) and by R. Lakoff (1975). Tense is not a matter of pure Structuralism, just as language is not - extralinguistic factors ought to be accounted for before any study can claim to be conclusive. For this reason I do not in any way claim to have made an exhaustive study of time and tense - I have simply attempted to summarize and coordinate thoughts on the subject, and to suggest tentatively that the most adequate grammar of English would probably derive tense from underlying temporal adverbs.
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  • Date Issued: 1979

'n Ondersoek na die vorm wat die opvoering in die primêre skool kan aanneem : met spesiale verwysing na geselekteerde primêre skole in die Westelike Provinsie

  • Authors: Du Plessis, Philippus Lodewicus
  • Date: 1979
  • Subjects: Drama in education
  • Language: Afrikaans
  • Type: Thesis , Masters , MA
  • Identifier: vital:2128 , http://hdl.handle.net/10962/d1002030 , Drama in education
  • Description: Watter vorm moet die opvoering in die primêre skool aanneem ? Die opvoering in die skool, en veral in die primêre skool word, veral sedert Peter Slade (1959 : 41-57 ens.) en Brian Way (1970 : 2-3 + 6-8 + 186- 189 + 268-269) gewaarsku het teen die gevare van die opvoering, deur baie beoefenaars van skooldrama afgekeur. Daar het in Engeland, Amerika en ook in Suid-Afrika tweespalt begin ontstaan tussen die aanhangers van die sogenaamde formeIe drama en die sogenaamde informele of vrye drama. Daar behoort nie so 'n tweespalt te wees indien die hele aangeleentheid reg benader word nie. (Heathcote soos opgeneem in Hodgson en Banham 1972 : 41). Daar word beoog om in hierdie studie ondersoek in te stel na die moontlike benaderingswyses asook die wenslikheid van die opvoering in die primêre skool. Die doel van hierdie studie is am opnuut te besin oor die waarde wat die skoolopvoering vir die kind kan hê. Ons durf, as opvoeders, die kind nie uitsluit van 'n aktiwiteit wat 'n bydrae tot sy totale ontwikkeling sou kon lewer nie. Daar word dus gehoop om tot 'n herwaardering van die skoolopvoering te kom wat waardevol sal kan wees in die opvoeding van die kind
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  • Date Issued: 1979

Painting and the changing role of art

  • Authors: Edwards, Veryan Courtenay
  • Date: 1979
  • Subjects: Painting Art and society
  • Language: English
  • Type: Thesis , Masters , MFA
  • Identifier: vital:2482 , http://hdl.handle.net/10962/d1011740
  • Description: It is necessary to find out what the role of art is in order to see whether it changes. The role of art can be taken as synonymous with the words, 'function of art'. The role of art and the art work itself are inextricably linked. If we look at the role of art as analogous to a wheel we can look at the argument thus : the wheel exists in order to roll. Its function is to roll. The wheel's function of rolling informs us about its existence. Function and the wheel's existence cannot be separated. The role of art and the art work itself are inextricably tied. Intro. p. 1.
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  • Date Issued: 1979

An automatic programming system to generate payroll programs

  • Authors: Fielding, Elizabeth Vera Catherine
  • Date: 1979
  • Subjects: Computer software -- Development , Programming (computers) , Software architecture
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4695 , http://hdl.handle.net/10962/d1011829 , Computer software -- Development , Programming (computers) , Software architecture
  • Description: The purpose of this project was to try to investigate one approach to the problem of automatically generating programs from some specification. Rather than following the approach which requires the user to define his problem using some formulation, it was decided to look at a class of problems that have similar solutions, but have many variations, and to try to design a system capable of obtaining user requirements and generating solutions tailored to these requirements. The aim was to design the system in such a way that it could be extended to cater for other classes of problems, so that eventually a system which could automatically generate program solutions for a range of problems might be developed. Intro. p. 1.
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  • Date Issued: 1979

The culture of Penaeus Indicus Milne Edwards in experimental closed systems with special reference to water quality

  • Authors: Gerhardt, Hedley Vernon
  • Date: 1979
  • Subjects: Penaeus Indicus , Aquatic animals , Water quality
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5595 , http://hdl.handle.net/10962/d1002045 , Penaeus Indicus , Aquatic animals , Water quality
  • Description: This study embraces two aspects of closed system culture: (a) a comparative study of four different biological filtration treatments, and (b) a quantitative determination of the nitrogen flow in a particular biological filtration system. Twenty 0,5 g juvenile Penaeus indicus Milne Edwards were cultured for approximately two months in four different kinds of sea water recirculatory systems with bacterial filtration, algal filtration, algar plus bacterial filtration and water exchange (25% every 3 days). Growth was comparable to that found in the literature for P. indicus. Nitrification occurred in all systems irrespective of the type of biological filtration employed. Ammonia, nitrite and nitrate levels were reduced by the algae, but nitrate accumulated to approximately 30 mg NO¯³ -Nℓ¯¹ in those systems without algae. Depletion of trace elements (Cu, Fe, Zn, Hn and Co) by the algae did not occur due to trace metal replenishment from the addition of food. No marked changes occurred in the concentrations of the major cations (Ca⁺⁺, Mg⁺⁺, Na⁺ and K⁺), but a small increase in Ca⁺⁺ levels was detectable in those systems with oyster shell chips in the filtration medium. Only minor changes occurred in oxygen or pH values in the various systems tested. Inorganic carbon levels showed major increases in the algal filtration systems, while a slight drop occurred in the bacterial filtration systems. The increase in the algal filtration systems was thought to be due to the formation of carbonates and bicarbonates by the reaction of respiratory CO₂ with unionized ammonia and water. Suggestions are made as to how closed systems can be improved upon. By determining the rate of excretion of P.indicus as related to size and temperature, its faecal production, and the nitrogen content of P.indicus, its food and faeces, the nitrogen flow within a system could be calculated. P.indicus was found to have an assimilation efficiency of 88,93% and a food conversion ratio of 3,49:1. Of the total dietary nitrogen input into the system, P.indicus ingested 69,02% - 19,80% of which was used for growth, 41,58% excreted and 7,64% lost as faeces. The remaining 30,98% of the total nitrogen input can be regarded as excess food nitrogen. The total nitrogen loading on the biological filtration system was found to be 80,20% of the total input of dietary nitrogen. The ability of various types of filamentous algae to remove these nitrogen compounds was determined. Suggestions are made as to the application of this information on nitrogen flow to the culture of P.indicus
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  • Date Issued: 1979

Anglican missionary policy in the diocese of Grahamstown under the first two bishops, 1853-1871

  • Authors: Goedhals, Mary Mandeville
  • Date: 1979
  • Subjects: Anglican , Diocese , Grahamstown , Bishops , Missionary policy , Cattle Killing , Government , Education , Black people , John Armstrong , Henry Cotterill
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:1211 , http://hdl.handle.net/10962/d1001540
  • Description: In 1843 a committee of the Colonial Bishroprics Fund appointed to investigate the state of the Church of England at the Cape of Good Hope, recommended the formation of a bishopric, and suggested that the bishop settle in the eastern districts of the colony, with an archdeacon in Cape Town. Three significant principles had been enunciated: the church was to grow under a bishop, the church would have a dual mission to blacks and whites, and the colony's eastern frontier, long a political and military headache, was seen as the focus of a new and spiritual battle. Contact between Nguni tribesmen and the eastward-moving European trekboer began in the region of the Fish River during the rule of the Dutch East India Company. Cattle and land were the main ingredients of the frontier conflict. From the point of view of the white settler, the growing cattle trade meant an increased need for pasture, but although the motive for expansion was economic, frontiersmen had come to regard large lands as their birthright. The semi-nomadic pastoral economy of the Nguni also required abundance of land, which was vested in the tribe. To the tribesmen, their cattle had a political, social and religious significance which transcended the economic. Cattle were sacrificed to the ancestors to propitiate the shades of the departed and to secure the prosperity of the tribe. The years of conflict, the constant threat to their herds and their land, undermined the basis of Nguni society, without providing it with a new foundation.
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  • Date Issued: 1979

The study of hydroxyoximes and hydroxamic acids supported on macroporous resins and their use in the rapid seperation of metals

  • Authors: Hemmes, Marlene
  • Date: 1979
  • Subjects: Chromatographic analysis , Separation (Technology) , Metal ions , Solvent extraction , Extraction (Chemistry) , Oximes , Metals -- Analysis
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4453 , http://hdl.handle.net/10962/d1009512
  • Description: Introduction: The macroporous Amberlite XAD resins were coated with LIX-64N and examined for the rate of uptake of copper . XAD-7 was by far the best support and gave a satisfactory rate of uptake up to loadings of 60% (w/w). The specific surface area of XAD-7 was measured by the adsorption of methylene blue from aqueous solution. The area of the wetted resin was five times less than that of the dry resin. LIX-65N was purified and the anti isomer characterised using spectroscopic techniques . The rate of uptake of copper was not improved by use of purified LIX-65N or by addition of LIX-63. XAD-7 coated with LIX-65N was used in columns. Elution curves for copper showed negligible tailing, and rapid separations of copper from iron (111), nickel, cobalt and magnesium by selective absorption were achieved. Copper was concentrated from very dilute solution at a flow rate of 50 ml min -1 ,and a 99% recovery was obtained. The method was applied to the rapid determination of copper in brass and bronze. A series of long-chain hydroxamic acids were synthesised and tested for suitability as stationary phase on XAD-7. Oleohydroxamic acid and naphthenohydroxamic acid were the most promising. The r ate of uptake of copper was reduced by the use of nonylphenol or amyl alcohol as a diluent. The capacities for copper of the hydroxamic acids were less when supported on XAD-7 than when used as liquid ionexchangers. The distribution coefficients of cobalt, nickel, zinc, lead, vanadium, uranium, iron (111) and copper were measured as a function of pH. XAD-7 coated with oleohydroxamic acid was used in columns for the rapid separation of iron (111) from copper and of copper from nickel, cobalt, lead and zinc. Copper was concentrated from very dilute solution at a flow rate of 45 ml min -1 and a 100,8% recovery was obtained. Copper was successfully separated from nickel by selective elution. The elution curves obtained show negligible tailing. The resin loaded with oleohydroxamic acid lost capacity due to chemical instability. Naphthenohydroxamic acid supported on XAD-7 was not suitable for use in columns, because it was physically unstable.
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  • Date Issued: 1979

The taxonomy and osteology of fishes of the family Tripterygiidae (Perciformes : Blennioidei) of South Africa

  • Authors: Holleman, Wouter
  • Date: 1979
  • Subjects: Tripterygiidae -- South Africa , Blennioidei -- South Africa
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5185 , http://hdl.handle.net/10962/d1001961 , Tripterygiidae -- South Africa , Blennioidei -- South Africa
  • Description: This study is divided into two parts. The first deals with the taxonomy of the South African fishes of the Tripterygiidae. The second part describes the osteology of one genus of the family, and draws comparisons with the other genera discussed in this study. Five genera of Tripterygiidae are recognized from South African waters. Cremnochorites, a monotypic genus, is described as new. The single species, C. capensis, has been recorded only from the southern and south-eastern coast of South Africa. It is distinguished from other genera by a combination of features which includes scalation, dorsal and anal fin spine counts, and various osteological characters. Three genera, Norfolkia Fowler, Helcogramma McCulloch & Waite, and Enneapterygius Rüppell occur throughout most of the Indo-Pacific. A single species of Norfolkia, N. springeri Clark (in press) is found in Zululand. Two species are ascribed to Helcogramma, H. obtusirostre (Klunzinger) and H. fuscopinna sp.n. Parallels are drawn between two species of Tripterygion Risso, T. tripteronotus and T. delaisi from the Mediterranean. The two South African Helcogramma species show similar depth preferences to the two Tripterygion species, resulting in similar morphological differences between the two species of each pair. The genus Enneapterygius Rüppell is divided into two genera, Enneanterygius and Scoliosolen gen.n. The division is based on the form of the supraoccipital sensory canal and associated osteological characters. Sooliosolen has a crescent-shaped supraoccipital canal and cranial osteology similar to the majority of other tripterygiid genera, whereas Enneapterygius has a 'U'-shaped supraoccipital canal which curves around the first dorsal fin, a comparatively long, concave supraoccipital bone which extends anteriorly between the parietal and between the posterior ends of the frontals. Two species are referred to Scoliosolen, S. abeli (Klausewitz) and S. conspicuus (Clark), and two new species are described for Enneapterygius, E. pulcherrimus and E. trianeulus. A literature survey revealed little consistency in ascribing species to any particular genus. Thus, throughout this study an attempt is made to define the genera so that future confusion can be avoided. In the light of these definitions an assessment is made of the original descriptions of a large number of species to determine which of the species can be ascribed to Norfolkia and to Helcogramrna. This has been possible to a lesser degree for Enneapterygius and Scoliosolen, for the major external feature separating these two genera, the shape of the supraoccipital sensory canal, is described only for Red Sea (Clark, in press) and South African species (this study). This study places four species in Enneapterygius, and six in Scoliosolen. To provide a firmer foundation for defining the genera, an investigation was made of the osteology of Scoliosolen conspicuus. Enneapterygius was originally chosen for the osteolofical study as it is reputedly the largest genus of the family, and thus likely to be the most generalized. Once comparisons had been made with other Enneapterygius species, it became apparent that this genus had to be divided into two genera, Enneapterygius and Scoliosolen. It is not known whether Scoliosolen is the largest genus, but it is likely to be one of the largest once a complete survey of the species originally ascribed to Enneapterygius has been undertaken. Finally, an osteological comparison is made of the five genera which occur in South African waters to provide firmer bases for the generic definitions. Only those characters which appear to be constant within a genus are used. Reference is made to a number of genera which do not occur in South African waters, to ensure that the characters chosen cannot be applied to other genera
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  • Date Issued: 1979

The nature and function of setting in Jane Austen's novels

  • Authors: Kelly, Patricia Marguerite Wyndham
  • Date: 1979
  • Subjects: Austen, Jane, 1775-1817 , English fiction , Eighteenth century , Novel , Setting , Northanger Abbey , Pride and Prejudice , Mansfield Park , Emma
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:2172 , http://hdl.handle.net/10962/d1001823
  • Description: This study examines the settings in Jane Austen's six novels. Chapter I introduces the topic generally, and refers briefly to Jane Austen's aims and methods of creating her settings. Short accounts are given of the emphasis put on setting in the criticism of Jane Austen's work; of the chronology of the novels; and of the use made of this aspect of the novel in eighteenth-century predecessors. Chapter II deals with the treatment of place in Northanger Abbey, Sense and Sensibility, Pride and Prejudice, Mansfield Park and Emma. The consideration of five novels together makes it possible to generalize about aspects of place common to all , and to discuss particulars peculiar to individual novels without, I hope, excessive repetition. The chapter may be thought disproportionately long, but this aspect of setting is most prominent and important in the delineation of character. Chapter III discusses the handling of spatial detail and time in these five novels. Chapter IV offers a fuller analysis of what is the chief concern of this thesis, the nature and function of setting, in respect of the single novel Persuasion, and attempts to draw together into a coherent whole some of the points made in Chapters II and III. Persuasion separates conveniently from the other works, not only because it was written after them, but more importantly because in it there is a new development in Jane Austen's use of setting. Some critics, notably E.M. Forster and B.C. Southam, have found startlingly new qualities in the setting of Sanditon, and, certainly, the most striking feature of the fragment is the treatment of place. But Jane Austen left off writing Sanditon in March 1817 because of illness, and the twelve chapters make up too small and unfinished a piece to be considered in the same way as the other novels. The Watsons, too, except for some references to it in Chapter I, does not come within the scope of this dissertation. Another introductory point needs to be made briefly. Where it is necessary, the distinction between Jane Austen and the omniscient narrator is observed, but generally, partly because it is clear that Jane Austen's values are close to those of the narrator, and partly because it is convenient, traditional and sensible to do so, the name "Jane Austen" is used to refer both to the actual person and to the narrator of the novels.
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  • Date Issued: 1979

A re-examination of the Carter solutions of Einstein's field equations

  • Authors: Kun, A Ah
  • Date: 1979
  • Subjects: Einstein field equations Space and time General relativity (Physics)
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5442 , http://hdl.handle.net/10962/d1001995
  • Description: The study of geodesics in space-time is essential to a comprehensive understanding of the physics of the field. Global properties, e.g. the singularity structure and completeness of space-time, can be related to the geodesic properties, thus it is through the solutions of the geodesic equation of motion that many of the global properties of space-time can be obtained in an easily interpretable form. However, it is usually very difficult to integrate the geodesic equations for the particle motion in the presence of a gravitational field (Introduction, p. 1)
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  • Date Issued: 1979
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