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The performance of a 22 GHz radio telescope

- Gaylard, Michael John

  • Authors: Gaylard, Michael John
  • Date: 1977
  • Subjects: Radio telescopes , Paraboloid
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5520 , http://hdl.handle.net/10962/d1011946 , Radio telescopes , Paraboloid
  • Description: The performance of the Rhodes 22 GHz radio telescope and its improvement are discussed in this thesis. The reflector surfaces of the Cassegrain antenna were surveyed and the surface errors minimised, while the magnitude of thermal and gravitational defomations was calculated. The design and operation of the microwave front end has been improved, and the mixer performance characterised. The continuum and spectral line receivers and their sensitivity are described. The aperture efficiency, which has been raised from 0,47 to 0,57, was deduced from solar and lunar observations and atmospheric attenuation measurements. The antenna beam pattern was also obtained from the observations, with the aid of a computer program, and is compared to that predicted for the telescope.
  • Full Text:
  • Date Issued: 1977

The Peripsum

- Church music workshop participants, Mosese, J., Dargie, Dave

The polysaccharides of Opuntia ficus-indica (L.) Mill. and Opuntia aurantiaca Lindl.

- McGarvie, Donald

  • Authors: McGarvie, Donald
  • Date: 1977
  • Subjects: Polysaccharides
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4438 , http://hdl.handle.net/10962/d1007597
  • Description: The partially acetylated acidic mucilage isolated from the cactus Opuntia ficus-indica consists of a highly branched molecule containing D-galactose, L-arabinose, D-xylose, D-galacturonic acid and L-rhamnose in the ratio 2.9:6.6:3.8:1.3 : 1.0. A partial hydrolysis study led to the isolation of fourteen oligosaccharides and a degraded polysaccharide. Periodate oxidation of the degraded polysaccharide and methylation analysis of the degraded and reduced degraded polysaccharides led to the proposal of a structure for the degraded polysaccharide consisting of a chain of alternating α-l,4-D-galactopyranosyluronic acid and β-1,2-Lrhamnopyranosyl units with branches consisting of short chains of β-1,6-D-galactopyranosyl units Iinked to C-3 of the rhamnose residues. An insight into the nature of the peripheral side-chains was obtained by methylation studies of the oligosaccharides and the native polysaccharide. The majority of the side-chains are terminated by D-xylopyranosyl and L-arabinofuranosyl units while there is a small proportion of D-galactopyranosyl end-groups. The remaining units of the peripheral chains consists of mainly 1,3- and 1,5-1 inked L-arabinofuranosyl units. The acidic polysaccharide isolated from the jointed cactus Opuntia aurantiaca contains D-galactose, L-arabinose, D-xylose, D-galacturonic acid and L-rhamnose in the ratio 5.9:5 .5:3.4: 1. 2:1.0 . A partial hydrolysis study revealed a similar series of galactose containing oligosaccharides as was identified from the mucilage of Opuntia ficus-indica. The degraded polysaccharide isolated from the partial hydrolysate was methylated and a possible structure proposed for the repeating unit. Methylation studies of the native polysaccharide indicated a polysaccharide with a more complex structure than that for the mucilage of Opuntia ficus-indica.
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  • Date Issued: 1977

The reproachers

- Church music workshop participants, Kataka, S., Father, Dargie, Dave

The responses

- Church music workshop participants, Mosese, Suping, Molefe, Dargie, Dave

The structure of aliphatic amine adducts of uranyl acetylacetonate. II. Dioxobis(2,4-pentanedionato)mono (2-N,N-dimethylaminopentan-4-one)uranium(VI)

- Nassimbeni, L R, Orpen, G, Pauptit, R A, Rodgers, Allen L, Haigh, John M

  • Authors: Nassimbeni, L R , Orpen, G , Pauptit, R A , Rodgers, Allen L , Haigh, John M
  • Date: 1977
  • Language: English
  • Type: text , Article
  • Identifier: vital:6416 , http://hdl.handle.net/10962/d1006533
  • Description: Introduction: In a previous analysis of a compound of this type, we have established that the adduct molecule is bonded through O and that the geometry about U is pentagonal bipyramidal (Haigh, Nassimbeni, Pauptit, Rodgers & Sheldrick, 1976). We have carried out the present analysis to study the conformational effects on the ligand brought about by substitution at N.
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  • Date Issued: 1977

The structure of aliphatic amine adducts of uranyl acetylacetonate. III. Dioxobis(2,4-pentanedionato)mono (2-N-isopropylaminopentan-4-one)uranium(VI)

- Rodgers, A L, Nassimbeni, L R, Haigh, John M

  • Authors: Rodgers, A L , Nassimbeni, L R , Haigh, John M
  • Date: 1977
  • Language: English
  • Type: text , Article
  • Identifier: vital:6419 , http://hdl.handle.net/10962/d1006552
  • Description: Introduction: In two earlier structural determinations of compounds of this type we have shown that the conformation of the adduct moiety is dependent on the formation of intramolecular N-H...0 hydrogen bonds (part I: Haigh, Nassimbeni, Pauptit, Rodgers & Sheldrick, 1976; part II: Nassimbeni, Orpen, Pauptit, Rodgers & Haigh, 1977). We have carried out the present analysis to study the conformational effects on the ligand brought about by the steric influence of an isopropyl substituent at N.
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  • Date Issued: 1977

The structure of aliphatic amine adducts of uranyl acetylacetonate. IV. Dioxobis(2,4-pentanedionato) mono(2-aminopentan-4-one)uranium(VI)

- Rodgers, A L, Nassimbeni, L R, Pauptit, R A, Orpen, G, Haigh, John M

  • Authors: Rodgers, A L , Nassimbeni, L R , Pauptit, R A , Orpen, G , Haigh, John M
  • Date: 1977
  • Language: English
  • Type: text , Article
  • Identifier: vital:6420 , http://hdl.handle.net/10962/d1006555
  • Description: Introduction: We have shown in three earlier determinations of aliphatic amine adducts of U02(AA)2 (part I: Haigh, Nassimbeni, Pauptit, Rodgers & Sheldrick, 1976; part II: Nassimbeni, Orpen, Pauptit, Rodgers & Haigh, 1977; part III: Rodgers, Nassimbeni & Haigh, 1977) that the conformation of the adduct is dependent on its ability to form hydrogen bonds. The present compound has two H atoms available for hydrogen bonding and may be regarded as the parent of the series.
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  • Date Issued: 1977

The tightrope walker

- Dale, Jessie Patricial Dill

The working method of the modern painter

- Grant, David

  • Authors: Grant, David
  • Date: 1977
  • Subjects: Painting, Modern -- 20th century , Painting -- Technique
  • Language: English
  • Type: Thesis , Masters , MFA
  • Identifier: vital:2503 , http://hdl.handle.net/10962/d1014984
  • Description: [From Introduction]. Prior to 1800 advances made in painting could often be accredited to the advances made in paint technology. Since the beginning of the last century however, paint technology has stabilised, moved into the background and allowed the artist to create with the medium rather than be dictated to by it. This stabilising of art technology has also generated a lack of interest in technique, leading in turn to a number of painting techniques being lost. In some ways we know less today of the oil medium and its correct use than was known to Jan and Hubert Van Eyck and their followers. However, if this lack of concern with technique has produced a large number of valid artistic statements which are unlikely to survive physically, it also means that the hoardes of painters who painted technically perfect paintings with no valid art statement have dwindled as well.
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  • Date Issued: 1977

Thetha Nkosi ndiphulaphule

- Workshop participants, Luqola, Herbert, Dargie, Dave

Thetha Nkosi ndiphulaphule

- Workshop participants, Masakhale, Anaketha, Dargie, Dave

Thetha Nkosi ndiphulaphule = Antiphon

- Xhosa composer's workshop participants, Masakhale, Annaketha, Dargie, Dave

Thixo bawo siyakubulela

- Workshop participants, Mokomele, Pascalina, Dargie, Dave

Thixo bawo siyakubulela

- Workshop participants, Mokomele, Pascalina, Dargie, Dave

Thixo bawo siyakubulela = Antiphon

- Xhosa composer's workshop participants, Mokomele, Pascalina, Dargie, Dave

Thokozani bantu beNkosi

- Workshop participants, Matiude, Dargie, Dave

Thokozani bantu beNkosi

- Music workshop participants, Mathindre, S., Dargie, Dave

Thomas Philipp's picnic 1821. Second night: The Dance

- Butler, Guy F

  • Authors: Butler, Guy F
  • Date: 1977
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/458924 , vital:75781 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_339
  • Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
  • Full Text:
  • Date Issued: 1977

Title not specified

- Church Choir, Martina, OSB, Sister, Dargie, Dave

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