Popanda Ngwazi tidakafa ndinjala
- Kambazite Makorekore, Mang'anja men, Tracey, Andrew T N
- Authors: Kambazite Makorekore , Mang'anja men , Tracey, Andrew T N
- Date: 1990
- Subjects: Nyanja (African people) -- Malawi , Folk music -- Malawi , Percussion instruments -- Africa , Sub-Saharan African music , Africa Malawi Chileka f-sx
- Language: Nya
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/75161 , vital:30382 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC016b-06
- Description: Traditional music accompanied by valimba xylophone and rattles.
- Full Text: false
- Date Issued: 1990
- Authors: Kambazite Makorekore , Mang'anja men , Tracey, Andrew T N
- Date: 1990
- Subjects: Nyanja (African people) -- Malawi , Folk music -- Malawi , Percussion instruments -- Africa , Sub-Saharan African music , Africa Malawi Chileka f-sx
- Language: Nya
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/75161 , vital:30382 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC016b-06
- Description: Traditional music accompanied by valimba xylophone and rattles.
- Full Text: false
- Date Issued: 1990
Radio studies of ionized hydrogen in the southern Milky Way
- Authors: Gaylard, Michael John
- Date: 1990
- Subjects: Interstellar hydrogen Milky Way Astrophysics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5440 , http://hdl.handle.net/10962/d1001993
- Description: This thesis describes the results of a survey of the HI42ɑ recombination line emission at 2.3 GHz from HII regions in the Southern Milky Way, carried out with the 26 m diameter Hartebeesthoek radio telescope. The Galactic Longitude range covered was 290° to 40°. Single recombination lines were detected from 375 positions. Multiple lines were observed towards 90 positions in the inner Galaxy. No line emission could be detected in 28 positions. Continuum antenna temperatures were estimated from drift scans or radio maps observed for the purpose. LTE electron temperatures and turbulent velocities of the HII regions were calculated where possible. The properties of the sample were compared to those observed in HI09ɑ surveys. The lines observed from over 50 positions were first detections, of which half were associated with optically-identified HII regions. In about 150 cases the lines were only the second to be detected from those HII regions. The processes of the radio emission, detection, and analysis were simulated numerically. The detectability of the emission and the magnitude of non-LTE effects and pressure-broadening in multi-component HII regions was predicted and compared to observations. The radio luminosity function of the HII regions was determined over a range of three orders of magnitude in intrinsic brightness for the first time, using techniques which corrected for different types of incompleteness in the samples. The luminosity function was compared to those in five selected spiral galaxies, and shown to lie between those of M33 and M81. An alternate form of the luminosity function was developed for use with a numerical model of the spiral arm structure of the Milky Way. The physical parameters defining the major spiral arms were established by comparing synthesized diagrams of radial velocity versus Galactic Longitude with those actually observed. The faint, extended HII regions S9 and RCW129 in Scorpius, the Barnard Loop in Orion, and S296 in Canis Major were analyzed, using all available data. All the recombination lines from these HII regions were first detections
- Full Text:
- Date Issued: 1990
- Authors: Gaylard, Michael John
- Date: 1990
- Subjects: Interstellar hydrogen Milky Way Astrophysics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5440 , http://hdl.handle.net/10962/d1001993
- Description: This thesis describes the results of a survey of the HI42ɑ recombination line emission at 2.3 GHz from HII regions in the Southern Milky Way, carried out with the 26 m diameter Hartebeesthoek radio telescope. The Galactic Longitude range covered was 290° to 40°. Single recombination lines were detected from 375 positions. Multiple lines were observed towards 90 positions in the inner Galaxy. No line emission could be detected in 28 positions. Continuum antenna temperatures were estimated from drift scans or radio maps observed for the purpose. LTE electron temperatures and turbulent velocities of the HII regions were calculated where possible. The properties of the sample were compared to those observed in HI09ɑ surveys. The lines observed from over 50 positions were first detections, of which half were associated with optically-identified HII regions. In about 150 cases the lines were only the second to be detected from those HII regions. The processes of the radio emission, detection, and analysis were simulated numerically. The detectability of the emission and the magnitude of non-LTE effects and pressure-broadening in multi-component HII regions was predicted and compared to observations. The radio luminosity function of the HII regions was determined over a range of three orders of magnitude in intrinsic brightness for the first time, using techniques which corrected for different types of incompleteness in the samples. The luminosity function was compared to those in five selected spiral galaxies, and shown to lie between those of M33 and M81. An alternate form of the luminosity function was developed for use with a numerical model of the spiral arm structure of the Milky Way. The physical parameters defining the major spiral arms were established by comparing synthesized diagrams of radial velocity versus Galactic Longitude with those actually observed. The faint, extended HII regions S9 and RCW129 in Scorpius, the Barnard Loop in Orion, and S296 in Canis Major were analyzed, using all available data. All the recombination lines from these HII regions were first detections
- Full Text:
- Date Issued: 1990
Religious experience and schizophrenia in modern man : an experiential theoretical study
- Borchardt, Frederick Francois
- Authors: Borchardt, Frederick Francois
- Date: 1990
- Subjects: Schizophrenia -- Religious aspects , Experience (Religion) -- Psychological aspects
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2897 , http://hdl.handle.net/10962/d1002061
- Description: In this study the psychological structures of two categories of religious and schizophrenic experience were examined from a phenomenological- existential perspective. Existing theories describe schizophrenia as an unfree, rigid experience with limited possibilities for selfhood. Some theorists believe, however, that some forms of schizophrenia can be seen as potential growth experiences which could facilitate existential renewal. These forms of schizophrenia are mystical, mythical or spiritual in nature. Religious experiences are, according to the literature, essentially renewal experiences facilitating existential growth and transformation through a particular system of thought and devotional relationship shared by a group of people. The Duquesne phenomenological- psychological method was used to analyse seven case studies, four of which involved schizophrenic experiences and three which involved religious conversion experiences. The general psychological structure which emerged through this analysis showed both schizophrenia and religious experience to have specific implications for the personal, social, material and mystical dimensions of being. The description of a specific psychological structure of experience which could optimally facilitate existential growth and transformation was attained by examining psychological structures where the subject's experience culminated in existential growth and transformation (such as religious experience and certain schizophrenIc experiences). As both these categories of experience displayed a strong mystical component, a psychological structure of experience which facilitates a transformative mystical experience was described. It can be concluded that an experience involving a mystical dimension could be transformative if the general psychological structure of the person displays (a) an openness towards reality as it presents itself (b) an experience of oneself as having a measure of existential freedom (c) a certain sense of security in one's own selfhood and (d) a social world which could understand, support and reflect inner experiences.
- Full Text:
- Date Issued: 1990
- Authors: Borchardt, Frederick Francois
- Date: 1990
- Subjects: Schizophrenia -- Religious aspects , Experience (Religion) -- Psychological aspects
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2897 , http://hdl.handle.net/10962/d1002061
- Description: In this study the psychological structures of two categories of religious and schizophrenic experience were examined from a phenomenological- existential perspective. Existing theories describe schizophrenia as an unfree, rigid experience with limited possibilities for selfhood. Some theorists believe, however, that some forms of schizophrenia can be seen as potential growth experiences which could facilitate existential renewal. These forms of schizophrenia are mystical, mythical or spiritual in nature. Religious experiences are, according to the literature, essentially renewal experiences facilitating existential growth and transformation through a particular system of thought and devotional relationship shared by a group of people. The Duquesne phenomenological- psychological method was used to analyse seven case studies, four of which involved schizophrenic experiences and three which involved religious conversion experiences. The general psychological structure which emerged through this analysis showed both schizophrenia and religious experience to have specific implications for the personal, social, material and mystical dimensions of being. The description of a specific psychological structure of experience which could optimally facilitate existential growth and transformation was attained by examining psychological structures where the subject's experience culminated in existential growth and transformation (such as religious experience and certain schizophrenIc experiences). As both these categories of experience displayed a strong mystical component, a psychological structure of experience which facilitates a transformative mystical experience was described. It can be concluded that an experience involving a mystical dimension could be transformative if the general psychological structure of the person displays (a) an openness towards reality as it presents itself (b) an experience of oneself as having a measure of existential freedom (c) a certain sense of security in one's own selfhood and (d) a social world which could understand, support and reflect inner experiences.
- Full Text:
- Date Issued: 1990
Rhodes University Annual Report 1990
- Authors: Rhodes University
- Date: 1990
- Subjects: Rhodes University -- history Rhodes University -- employees Rhodes University -- students
- Language: English
- Identifier: vital:20035
- Full Text:
- Date Issued: 1990
- Authors: Rhodes University
- Date: 1990
- Subjects: Rhodes University -- history Rhodes University -- employees Rhodes University -- students
- Language: English
- Identifier: vital:20035
- Full Text:
- Date Issued: 1990
Rhodes University Graduation Ceremony 1990
- Authors: Rhodes University
- Date: 1990
- Language: English
- Type: text
- Identifier: vital:8124 , http://hdl.handle.net/10962/d1005707
- Description: Rhodes University Graduation Ceremonies on Friday, 6 April 1990 at 8 p.m. [and] on Saturday, 7 April 1990 at 10 a.m. in the 1820 Settlers National Monument. , Rhodes University East London Graduation Ceremony Saturday; 12 May 1990 at 11.30 a.m. in the Guild Theatre.
- Full Text:
- Date Issued: 1990
- Authors: Rhodes University
- Date: 1990
- Language: English
- Type: text
- Identifier: vital:8124 , http://hdl.handle.net/10962/d1005707
- Description: Rhodes University Graduation Ceremonies on Friday, 6 April 1990 at 8 p.m. [and] on Saturday, 7 April 1990 at 10 a.m. in the 1820 Settlers National Monument. , Rhodes University East London Graduation Ceremony Saturday; 12 May 1990 at 11.30 a.m. in the Guild Theatre.
- Full Text:
- Date Issued: 1990
Sand inundation on rocky shores : its effects on species richness and the structure of species assemblages
- Authors: Dower, Katherine Mary
- Date: 1990
- Subjects: Intertidal ecology , Tide pool ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5814 , http://hdl.handle.net/10962/d1007183 , Intertidal ecology , Tide pool ecology
- Description: Although sand deposits are present on many intertidal rocky shores, their effects on species richness, zonation and trophic structure have often been overlooked. This study is the first to recognise sand as an important abiotic factor on South African rocky shores. Rocky shores in the eastern Cape Province of South Africa are subject to extensive sand inundation and are composed of two hard substrata of differing topographies. Four sites on one substratum and six on the other were sampled quantitatively using quadrats. The biota were identified, counted and/ or weighed to provide a matrix of species biomass and numbers in separate zones. This matrix was then analysed using ordination and classification. A total of 321 species were identified which is more than local rocky or sandy shores. While the intermediate disturbance hypothesis would predict high species richness on these shores, it does not fully explain this richness nor the distribution of species assemblages. Habitat heterogeneity, including the dynamics of sand deposits, is strongly influenced by substratum topography and is the most important factor generating species richness. Abrasion by sand (sand scour) causes local reductions in richness but the presence of semi-permanent sand deposits allows habitation by psammophilic and sand-dependent species. As a result the biota of a sand inundated rocky shore includes both a full rocky shore and a large sandy beach component. Substratum topography controls patterns of sand deposition and retention and community analysis showed that samples were clustered primarily according to species richness and secondarily according to substratum type. Ordination of species identified an arc of species assemblages of decreasing levels of sand tolerance. These corresponded to sample groupings so that th assemblages found in various habitats were characterised by particular levels of sand tolerance. The presence of sand has a negative effect on the biomass of primary producers and filter feeders but a positive effect on the biomass of deposit feeders. Because sand is retained to different degrees in different zones, trophic structure varies between zones and to a lesser extent, between rock types. In general, however, the trophic structure of sand inundated rocky shores is similar to that of non-inundated shores.
- Full Text:
- Date Issued: 1990
- Authors: Dower, Katherine Mary
- Date: 1990
- Subjects: Intertidal ecology , Tide pool ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5814 , http://hdl.handle.net/10962/d1007183 , Intertidal ecology , Tide pool ecology
- Description: Although sand deposits are present on many intertidal rocky shores, their effects on species richness, zonation and trophic structure have often been overlooked. This study is the first to recognise sand as an important abiotic factor on South African rocky shores. Rocky shores in the eastern Cape Province of South Africa are subject to extensive sand inundation and are composed of two hard substrata of differing topographies. Four sites on one substratum and six on the other were sampled quantitatively using quadrats. The biota were identified, counted and/ or weighed to provide a matrix of species biomass and numbers in separate zones. This matrix was then analysed using ordination and classification. A total of 321 species were identified which is more than local rocky or sandy shores. While the intermediate disturbance hypothesis would predict high species richness on these shores, it does not fully explain this richness nor the distribution of species assemblages. Habitat heterogeneity, including the dynamics of sand deposits, is strongly influenced by substratum topography and is the most important factor generating species richness. Abrasion by sand (sand scour) causes local reductions in richness but the presence of semi-permanent sand deposits allows habitation by psammophilic and sand-dependent species. As a result the biota of a sand inundated rocky shore includes both a full rocky shore and a large sandy beach component. Substratum topography controls patterns of sand deposition and retention and community analysis showed that samples were clustered primarily according to species richness and secondarily according to substratum type. Ordination of species identified an arc of species assemblages of decreasing levels of sand tolerance. These corresponded to sample groupings so that th assemblages found in various habitats were characterised by particular levels of sand tolerance. The presence of sand has a negative effect on the biomass of primary producers and filter feeders but a positive effect on the biomass of deposit feeders. Because sand is retained to different degrees in different zones, trophic structure varies between zones and to a lesser extent, between rock types. In general, however, the trophic structure of sand inundated rocky shores is similar to that of non-inundated shores.
- Full Text:
- Date Issued: 1990
Sarimbeta
- Kambazite Makorekore, Mang'anja men, Tracey, Andrew T N
- Authors: Kambazite Makorekore , Mang'anja men , Tracey, Andrew T N
- Date: 1990
- Subjects: Nyanja (African people) -- Malawi , Folk music -- Malawi , Percussion instruments -- Africa , Sub-Saharan African music , Africa Malawi Chileka f-sx
- Language: Nya
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/75186 , vital:30384 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC016b-08
- Description: Traditional song with valimba xylophone and rattles accompaniment.
- Full Text: false
- Date Issued: 1990
- Authors: Kambazite Makorekore , Mang'anja men , Tracey, Andrew T N
- Date: 1990
- Subjects: Nyanja (African people) -- Malawi , Folk music -- Malawi , Percussion instruments -- Africa , Sub-Saharan African music , Africa Malawi Chileka f-sx
- Language: Nya
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/75186 , vital:30384 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC016b-08
- Description: Traditional song with valimba xylophone and rattles accompaniment.
- Full Text: false
- Date Issued: 1990
Sigebenga
- Ngqoko married women villagers, Tracey, Andrew T N
- Authors: Ngqoko married women villagers , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93749 , vital:30922 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC029b-07
- Description: Traditional Thembu umngqungqo married women's song for girls initiation.
- Full Text: false
- Date Issued: 1990
- Authors: Ngqoko married women villagers , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93749 , vital:30922 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC029b-07
- Description: Traditional Thembu umngqungqo married women's song for girls initiation.
- Full Text: false
- Date Issued: 1990
Sikwakqeni
- Nonogcinile, Nomillion and group, Tracey, Andrew T N
- Authors: Nonogcinile, Nomillion and group , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , Whistling music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93591 , vital:30899 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC028b-07
- Description: Traditional Thembu umngqungqo women's song for girls initiation accompanied by whistling.
- Full Text: false
- Date Issued: 1990
- Authors: Nonogcinile, Nomillion and group , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , Whistling music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93591 , vital:30899 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC028b-07
- Description: Traditional Thembu umngqungqo women's song for girls initiation accompanied by whistling.
- Full Text: false
- Date Issued: 1990
Sisel' utywala
- Nonogcinile, Nomillion and group, Tracey, Andrew T N
- Authors: Nonogcinile, Nomillion and group , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , Hand-clapping music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93577 , vital:30897 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC028b-05
- Description: Traditional Thembu umngqungqo women's song for girls accompanied by clapping.
- Full Text: false
- Date Issued: 1990
- Authors: Nonogcinile, Nomillion and group , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , Hand-clapping music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93577 , vital:30897 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC028b-05
- Description: Traditional Thembu umngqungqo women's song for girls accompanied by clapping.
- Full Text: false
- Date Issued: 1990
Sobendiye
- Ngqoko young villagers, Tracey, Andrew T N
- Authors: Ngqoko young villagers , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , Hand-clapping music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93613 , vital:30902 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC029a-02
- Description: Traditional Thembu umtshotsho young people's dance song accompanied by clapping.
- Full Text: false
- Date Issued: 1990
- Authors: Ngqoko young villagers , Tracey, Andrew T N
- Date: 1990
- Subjects: Xhosa (African people) -- South Africa , Folk music , Hand-clapping music , folk dance , Sub-Saharan African music , Africa South Africa Lady Frere f-sa
- Language: Xhosa
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/93613 , vital:30902 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC029a-02
- Description: Traditional Thembu umtshotsho young people's dance song accompanied by clapping.
- Full Text: false
- Date Issued: 1990
Students' conceptions of simple D.C. electricity circuits: a study of primary, inappropriate conceptions, learning difficulties of physics students, and implications for instruction
- Authors: Jiya, Zindlovu
- Date: 1990
- Subjects: Physical sciences -- Study and teaching (Secondary) -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5441 , http://hdl.handle.net/10962/d1001994
- Description: The work attempts to identify the general conceptual problems of the generations of Black students who pass through flrst year physics courses at the University of Fort Hare. In particular the alternative conceptions of students in the area of direct current electricity are investigated, using various techniques including written diagnostic tests. The main method used in the investigation of the student frameworks is the personal interview. A varied number of inappropriate conceptions are identifled in the students in significantly large proportions, and these are found to be dependent on many factors; for example the socio-cultural background like language and its metaphors, and media images. It is established that some of these are exacerbated by student perceptions about the nature of physics and of the scientific enterprise in general. Certain proposals are made about how to remedy the situation; relying mainly on the recently established innovative instructional strategies like conceptual change and cognitive conflict, and on making proposals about restructuring certain forms of presentation of the subject matter, paying attention to how language is used to address the speciflc problems of the students. The importance of providing practical experiences for the students is also emphasised
- Full Text:
- Date Issued: 1990
- Authors: Jiya, Zindlovu
- Date: 1990
- Subjects: Physical sciences -- Study and teaching (Secondary) -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5441 , http://hdl.handle.net/10962/d1001994
- Description: The work attempts to identify the general conceptual problems of the generations of Black students who pass through flrst year physics courses at the University of Fort Hare. In particular the alternative conceptions of students in the area of direct current electricity are investigated, using various techniques including written diagnostic tests. The main method used in the investigation of the student frameworks is the personal interview. A varied number of inappropriate conceptions are identifled in the students in significantly large proportions, and these are found to be dependent on many factors; for example the socio-cultural background like language and its metaphors, and media images. It is established that some of these are exacerbated by student perceptions about the nature of physics and of the scientific enterprise in general. Certain proposals are made about how to remedy the situation; relying mainly on the recently established innovative instructional strategies like conceptual change and cognitive conflict, and on making proposals about restructuring certain forms of presentation of the subject matter, paying attention to how language is used to address the speciflc problems of the students. The importance of providing practical experiences for the students is also emphasised
- Full Text:
- Date Issued: 1990
Synthetic and spectrometric investigation of 1,4-benzoxazepines
- Authors: Whittal, R D
- Date: 1990
- Subjects: Spectrum analysis , Benzodiazepines
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4381 , http://hdl.handle.net/10962/d1005046
- Description: Flavanone (2,3-dihydro-2-phenyl-4H-benzopyran-4-one) and a series of 4'- and 7-halogeno derivatives were prepared from the corresponding 2'-hydroxychalcones [1-(2-hydroxyphenyl)-3-phenyl-2-propen-l-ones], which, in turn, were synthesized by aldol condensation of substituted 2'-hydroxacetophenones with various benzaldehydes. A series of 2,3-dihydro-2-phenyl-l,4-benzoxazepin-5(4H)-ones were prepared by ring expansion of the corresponding flavanones, via the Schmidt reaction, using trimethylsilylazide and trifluoroacetic acid. A series of tetrazoles {2,3-dihydro-2-phenyl-tetrazolo[1,5-d]-1,4-benzoxazepines} were also isolated as by-products of the Schmidt reaction. Flavanone oxime was synthesized for use in Beckmann reactions, and its molecular structure was determined by x-ray crystallography. Attempts to prepare 1,4-benzoxazepinone or its 1,5-analogue via Beckmann rearrangement of flavanone oxime, with polyphosphoric acid or phosphorus pentachloride catalysts, however, were unsuccessful. Several methods for introducing Δ²-unsaturation into the benzoxazepinone system were also examined. High resolution ¹H n.m.r., computer modelling, and molecular mechanics techniques were used to determine the conformations of the heterocycles of the benzoxazepinones and tetrazoles and results are compared with earlier studies in this field. Certain trends in the fragmentation patterns were observed in the low resolution mass spectra of the benzoxazepinones and tetrazoles, and high resolution mass spectrometric data were used to explore the major fragmentation patterns of these compounds.
- Full Text:
- Date Issued: 1990
- Authors: Whittal, R D
- Date: 1990
- Subjects: Spectrum analysis , Benzodiazepines
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4381 , http://hdl.handle.net/10962/d1005046
- Description: Flavanone (2,3-dihydro-2-phenyl-4H-benzopyran-4-one) and a series of 4'- and 7-halogeno derivatives were prepared from the corresponding 2'-hydroxychalcones [1-(2-hydroxyphenyl)-3-phenyl-2-propen-l-ones], which, in turn, were synthesized by aldol condensation of substituted 2'-hydroxacetophenones with various benzaldehydes. A series of 2,3-dihydro-2-phenyl-l,4-benzoxazepin-5(4H)-ones were prepared by ring expansion of the corresponding flavanones, via the Schmidt reaction, using trimethylsilylazide and trifluoroacetic acid. A series of tetrazoles {2,3-dihydro-2-phenyl-tetrazolo[1,5-d]-1,4-benzoxazepines} were also isolated as by-products of the Schmidt reaction. Flavanone oxime was synthesized for use in Beckmann reactions, and its molecular structure was determined by x-ray crystallography. Attempts to prepare 1,4-benzoxazepinone or its 1,5-analogue via Beckmann rearrangement of flavanone oxime, with polyphosphoric acid or phosphorus pentachloride catalysts, however, were unsuccessful. Several methods for introducing Δ²-unsaturation into the benzoxazepinone system were also examined. High resolution ¹H n.m.r., computer modelling, and molecular mechanics techniques were used to determine the conformations of the heterocycles of the benzoxazepinones and tetrazoles and results are compared with earlier studies in this field. Certain trends in the fragmentation patterns were observed in the low resolution mass spectra of the benzoxazepinones and tetrazoles, and high resolution mass spectrometric data were used to explore the major fragmentation patterns of these compounds.
- Full Text:
- Date Issued: 1990
Tankatara bushveld, Sunday's River, Port Elizabeth
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13249 , http://hdl.handle.net/10962/d1016342
- Description: Woman stripping Aloe ferox leaves for juice-tapping.
- Full Text: false
- Date Issued: 1990
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13249 , http://hdl.handle.net/10962/d1016342
- Description: Woman stripping Aloe ferox leaves for juice-tapping.
- Full Text: false
- Date Issued: 1990
Tankatara bushveld, Sunday's River, Port Elizabeth
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13250 , http://hdl.handle.net/10962/d1016343
- Description: Woman preparing Aloe ferox leaves for piling in order to induce juice-flow in the tapping process.
- Full Text: false
- Date Issued: 1990
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13250 , http://hdl.handle.net/10962/d1016343
- Description: Woman preparing Aloe ferox leaves for piling in order to induce juice-flow in the tapping process.
- Full Text: false
- Date Issued: 1990
Tankatara bushveld, Sunday's River, Port Elizabeth
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Aloe africana -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13246 , http://hdl.handle.net/10962/d1016339
- Description: Typical Aloe ferox plant. Note the Aloe africana plant protruding above the tall bushes, upper right.
- Full Text: false
- Date Issued: 1990
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Aloe africana -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13246 , http://hdl.handle.net/10962/d1016339
- Description: Typical Aloe ferox plant. Note the Aloe africana plant protruding above the tall bushes, upper right.
- Full Text: false
- Date Issued: 1990
Tankatara bushveld, Sunday's River, Port Elizabeth
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Aloe africana -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13247 , http://hdl.handle.net/10962/d1016340
- Description: Typical Aloe ferox plant. Note the Aloe africana plant protruding above the tall bushes, upper right.
- Full Text: false
- Date Issued: 1990
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Aloe africana -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13247 , http://hdl.handle.net/10962/d1016340
- Description: Typical Aloe ferox plant. Note the Aloe africana plant protruding above the tall bushes, upper right.
- Full Text: false
- Date Issued: 1990
Tankatara bushveld, Sunday's River, Port Elizabeth
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13248 , http://hdl.handle.net/10962/d1016340
- Description: Woman arranging Aloe ferox leaves for juice-tapping.
- Full Text: false
- Date Issued: 1990
- Authors: Vanderplank, Helen J
- Date: 1990
- Subjects: Aloe ferox -- South Africa -- Eastern Cape , Plants -- South Africa -- Eastern Cape
- Type: still image
- Identifier: vital:13248 , http://hdl.handle.net/10962/d1016340
- Description: Woman arranging Aloe ferox leaves for juice-tapping.
- Full Text: false
- Date Issued: 1990
The Academic Freedom Lecture: Daantjie Oosthuizen Memorial Lecture - Rhodes University 1990
- Slabbert, Frederik van Zyl, 1940-2010
- Authors: Slabbert, Frederik van Zyl, 1940-2010
- Date: 1990
- Subjects: Academic Freedom -- South Africa
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/291 , vital:19945
- Description: In South Africa, Academic Freedom Lectures usually take place within the context of the Regime/State vs the University. They are largely confined to English/Liberal Universities and are seen as a protest against the Extention of the University Education Act of 1959. Academic Freedom lectures reflect a concern with the Regime/State's encroachment on the presumed autonomy of a University, ideological dogmatism, authoritarianism, repression and obviously in the South African case, racism and exploitation.
- Full Text:
- Date Issued: 1990
- Authors: Slabbert, Frederik van Zyl, 1940-2010
- Date: 1990
- Subjects: Academic Freedom -- South Africa
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/291 , vital:19945
- Description: In South Africa, Academic Freedom Lectures usually take place within the context of the Regime/State vs the University. They are largely confined to English/Liberal Universities and are seen as a protest against the Extention of the University Education Act of 1959. Academic Freedom lectures reflect a concern with the Regime/State's encroachment on the presumed autonomy of a University, ideological dogmatism, authoritarianism, repression and obviously in the South African case, racism and exploitation.
- Full Text:
- Date Issued: 1990
The applicability of two simple single event rainfall-runoff models to catchments with different climate and physiography
- Authors: Beater, Anne Brenda
- Date: 1990
- Subjects: Hydrogeology Runoff -- South Africa Runoff -- United States Rain and rainfall -- South Africa Rain and rainfall -- United States
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4796 , http://hdl.handle.net/10962/d1001896
- Description: The study presents the results of applying two isolated event, constant runoff proportion, conceptual models to a range of catchments drawn from various climatic and physiographic regions of South Africa and the USA. The models can be operated in either lumped or semi-distributed modes. The research progressed through the following stages. The initial stage involved the calibration of both models on two sets of catchments so that an initial evaluation of the performance of the models could be carried out and any deficiencies in the model structure identified, and where practical, corrected. The models were then calibrated on a further 8 catchments. An important result of the calibration is that for both models to produce reasonably acceptable simulations, at least one parameter has to vary between storms on the same catchment to account for variations in storm or antecedent moisture characteristics. The next stage consisted of compiling quantitative descriptions of the physical characteristics of the catchments and rainfall events and an attempt to relate the calibrated parameter values to relevant physical characteristics for the purpose of estimating parameter values when calibration is not possible. Despite the difficulties encountered in quantifying some of the hydrological characteristics the general trends exhibited by many of the relationships are encouraging and the format of the combinations of physical variables used, do make sense with respect to the original parameter conceptualisations. The relationships between storm characteristics and parameters of both models are less satisfactory. There is a high degree of scatter and the between-catchment variation in the form of the relationships, indicates that the derived relationships are likely to be of little use for parameter estimation purposes. The final stage involved a validation exercise in which new parameters were estimated from the physical variable-parameter relationships for all the catchments previously used, as well as a further four. The new parameters were used to re-simulate all the storms and comparison of these results were made with the original calibration results. Both models produced poor results and are unlikely to give reliable results where calibration is not possible. The parameter relationships for the parameters related to storm characteristics are so catchment specific that transfer to other areas will produce unpredictable results. Foot note:- For compatability with computer printouts decimal full stops are used in the format of real numbers in tables etc
- Full Text:
- Date Issued: 1990
- Authors: Beater, Anne Brenda
- Date: 1990
- Subjects: Hydrogeology Runoff -- South Africa Runoff -- United States Rain and rainfall -- South Africa Rain and rainfall -- United States
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4796 , http://hdl.handle.net/10962/d1001896
- Description: The study presents the results of applying two isolated event, constant runoff proportion, conceptual models to a range of catchments drawn from various climatic and physiographic regions of South Africa and the USA. The models can be operated in either lumped or semi-distributed modes. The research progressed through the following stages. The initial stage involved the calibration of both models on two sets of catchments so that an initial evaluation of the performance of the models could be carried out and any deficiencies in the model structure identified, and where practical, corrected. The models were then calibrated on a further 8 catchments. An important result of the calibration is that for both models to produce reasonably acceptable simulations, at least one parameter has to vary between storms on the same catchment to account for variations in storm or antecedent moisture characteristics. The next stage consisted of compiling quantitative descriptions of the physical characteristics of the catchments and rainfall events and an attempt to relate the calibrated parameter values to relevant physical characteristics for the purpose of estimating parameter values when calibration is not possible. Despite the difficulties encountered in quantifying some of the hydrological characteristics the general trends exhibited by many of the relationships are encouraging and the format of the combinations of physical variables used, do make sense with respect to the original parameter conceptualisations. The relationships between storm characteristics and parameters of both models are less satisfactory. There is a high degree of scatter and the between-catchment variation in the form of the relationships, indicates that the derived relationships are likely to be of little use for parameter estimation purposes. The final stage involved a validation exercise in which new parameters were estimated from the physical variable-parameter relationships for all the catchments previously used, as well as a further four. The new parameters were used to re-simulate all the storms and comparison of these results were made with the original calibration results. Both models produced poor results and are unlikely to give reliable results where calibration is not possible. The parameter relationships for the parameters related to storm characteristics are so catchment specific that transfer to other areas will produce unpredictable results. Foot note:- For compatability with computer printouts decimal full stops are used in the format of real numbers in tables etc
- Full Text:
- Date Issued: 1990