Physiological traits, anthropometric characteristics and motor development of rural children in Nkonkobe Municipality, South Africa
- Authors: Idamokoro, Mere
- Date: 2018
- Subjects: Motor learning Children -- Physiology Children -- Anthropometry -- South Africa
- Language: English
- Type: Thesis , Masters , Human Movement Science
- Identifier: http://hdl.handle.net/10353/10061 , vital:35314
- Description: Aim: The purpose of this study was to examine the physiological, anthropometric and motor development characteristics of rural children between the ages of 5 – 7 years old. Methods: The study involved 305 school children (159 boys and 146 girls) randomly selected from primary schools in Alice sub-district, Nkonkobe Municipality. Body weight, height, skinfold thickness and girth measurements were measured using standard procedures. Overweight and obesity were defined using body mass index (BMI) for age and gender. Derived variables were: fat mass, fat-free mass, fat mass index, fat-free mass index, waist-to-hip ratio, waist-to-height ratio and subscapular-to-triceps ratio. Motor development levels were measured and assessed using Test of Gross Motor Development –Second Edition (TGMD-2). Blood pressure was measured using aneroid sphygmomanometer. Results: Boys had higher mean values of blood pressure (69.19 ± 7.30 and 38.15 ± 5.91) compared to girls (68.39 ± 7.97 and 37.11 ± 7.53). The proportion of overweight among girls (15.75 percent) was higher compared to boys (10.69 percent). Likewise, the percentage of obesity among boys (16.35 percent) was higher compared to girls (10.27 percent). The motor development results showed that girls (40.9 ± 6.54) performed better than boys (39.7 ± 6.64) in locomotor skills test. Conversely, boys (39.8 ± 7.62) performed better than girls (38.6 ± 7.29) in object control. Conclusion: The prevalence of overweight and obesity among the children is alarmingly high and concerning for the health. At all ages, girls had higher body fat percentage and fat mass than the boys. However, FFMI and WHR were higher in boys compared to the girls. There is no gender difference in the waist-to-height ratio and STR of both boys and girls. The locomotor raw score is higher in girls than in boys; however, the object control raw score is higher in boys compared to girls. The non-correlation of BMI with TGMD-2 tests suggests an equal potential of motor development among the children, regardless of their body fatness. There is need for obesity prevention programme in schools, which should involve all the stakeholders (teachers, parents/guardians, government, NGOs). The programme should focus on creating awareness concerning child body weight, healthy dietary intake and regular BMI screening in schools.
- Full Text:
- Authors: Idamokoro, Mere
- Date: 2018
- Subjects: Motor learning Children -- Physiology Children -- Anthropometry -- South Africa
- Language: English
- Type: Thesis , Masters , Human Movement Science
- Identifier: http://hdl.handle.net/10353/10061 , vital:35314
- Description: Aim: The purpose of this study was to examine the physiological, anthropometric and motor development characteristics of rural children between the ages of 5 – 7 years old. Methods: The study involved 305 school children (159 boys and 146 girls) randomly selected from primary schools in Alice sub-district, Nkonkobe Municipality. Body weight, height, skinfold thickness and girth measurements were measured using standard procedures. Overweight and obesity were defined using body mass index (BMI) for age and gender. Derived variables were: fat mass, fat-free mass, fat mass index, fat-free mass index, waist-to-hip ratio, waist-to-height ratio and subscapular-to-triceps ratio. Motor development levels were measured and assessed using Test of Gross Motor Development –Second Edition (TGMD-2). Blood pressure was measured using aneroid sphygmomanometer. Results: Boys had higher mean values of blood pressure (69.19 ± 7.30 and 38.15 ± 5.91) compared to girls (68.39 ± 7.97 and 37.11 ± 7.53). The proportion of overweight among girls (15.75 percent) was higher compared to boys (10.69 percent). Likewise, the percentage of obesity among boys (16.35 percent) was higher compared to girls (10.27 percent). The motor development results showed that girls (40.9 ± 6.54) performed better than boys (39.7 ± 6.64) in locomotor skills test. Conversely, boys (39.8 ± 7.62) performed better than girls (38.6 ± 7.29) in object control. Conclusion: The prevalence of overweight and obesity among the children is alarmingly high and concerning for the health. At all ages, girls had higher body fat percentage and fat mass than the boys. However, FFMI and WHR were higher in boys compared to the girls. There is no gender difference in the waist-to-height ratio and STR of both boys and girls. The locomotor raw score is higher in girls than in boys; however, the object control raw score is higher in boys compared to girls. The non-correlation of BMI with TGMD-2 tests suggests an equal potential of motor development among the children, regardless of their body fatness. There is need for obesity prevention programme in schools, which should involve all the stakeholders (teachers, parents/guardians, government, NGOs). The programme should focus on creating awareness concerning child body weight, healthy dietary intake and regular BMI screening in schools.
- Full Text:
Ruthenium (II) complexes of mixed bipyridyl and dithiolate/thiourea ligands :|bsynthesis, characterization, photophysical and electrochemical studies
- Authors: Nkombi, Pelokazi
- Date: 2018
- Subjects: Ruthenium Ruthenium compounds Ligands
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/10134 , vital:35358
- Description: Energy is one of the most important factor to influence human lives. The increased in energy demand as well as the detrimental effects posed by emission of greenhouse gases due to continue use of fossil fuels for electricity generation has led to a renewed focus on energy production using renewable energy sources which are relatively cheap, clean and environmentally sustainable. Among the various renewable energy sources used so far, the Dye Synthesized Solar Cells (DSSCs), a form of photovoltaic device is reported for their better efficiencies despite their low cost of production and ability to work relatively under low light conditions. A recent report on the solar-to-electricity conversion efficiency of a typical DSSC sensitizer made from zinc based porphyrin dye coupled with sintered titanium(IV) oxide as semiconductor was 13 percent. In this study, 2,2-bipyridyl-4,4-dicarboxylic acid (bpydc) was used as mixed ligand and four dithiolate ligands; L1 = dipotassium ethoxycarbonyl-1-cyanoethylene-2,2-dithiolate, L2 = dipotassium bis(ethoxycarbonyl)ethane-2,2-dithiolate, L3 = dipotassium cyanodithio imidocarbonate and L4 = dipotassium 2,2-dicyanoethylene-2,2-dithiolate were synthesized while four alkyl thiourea ligands, L5 = 1,3-dimethyl thiourea, L6 = 1,3-diethyl thiourea, L7 = 1,3-diisopropyl thiourea and L8 = 1-methyl thiourea were purchased and used as supplied without further purification. These ligands were used to prepare eight ruthenium(II) complexes of mixed bipyridyl/dithiolate/thiourea. The compounds were characterised by elemental analysis and spectroscopic techniques, namely: Fourier transform infrared (FTIR), Nuclear Magnetic Resonance (NMR), ultraviolet-visible and photoluminescence (PL). Cyclic voltammetry (CV) and square wave voltammetry (SWV) were used for the electrochemical studies. Photoluminescence and UV-Vis spectroscopies were used for geometric and photophysical studies of the complexes respectively. FTIR spectra confirmed presence of functional groups in ligands and coordination of these ligands to ruthenium(II) ions to form complexes. The UV-Vis confirmed that the Ru(II) dithiolene complexes exhibited square planar geometries while the Ru(II) thiourea complexes gave octahedral geometries, this was deduced from the transitions assigned to the complexes. All the ruthenium(II) complexes synthesized showed photoluminescence properties that are suitable for light harvesting and application for dye-sensitized solar cells. Cyclic and square wave voltammetry show Ru(II) thiourea complexes have better redox properties when compared to Ru(II) dithiolate complexes which is ascribed to ligand strength field possibly due to contribution from the two bonded NCS groups.
- Full Text:
- Authors: Nkombi, Pelokazi
- Date: 2018
- Subjects: Ruthenium Ruthenium compounds Ligands
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/10134 , vital:35358
- Description: Energy is one of the most important factor to influence human lives. The increased in energy demand as well as the detrimental effects posed by emission of greenhouse gases due to continue use of fossil fuels for electricity generation has led to a renewed focus on energy production using renewable energy sources which are relatively cheap, clean and environmentally sustainable. Among the various renewable energy sources used so far, the Dye Synthesized Solar Cells (DSSCs), a form of photovoltaic device is reported for their better efficiencies despite their low cost of production and ability to work relatively under low light conditions. A recent report on the solar-to-electricity conversion efficiency of a typical DSSC sensitizer made from zinc based porphyrin dye coupled with sintered titanium(IV) oxide as semiconductor was 13 percent. In this study, 2,2-bipyridyl-4,4-dicarboxylic acid (bpydc) was used as mixed ligand and four dithiolate ligands; L1 = dipotassium ethoxycarbonyl-1-cyanoethylene-2,2-dithiolate, L2 = dipotassium bis(ethoxycarbonyl)ethane-2,2-dithiolate, L3 = dipotassium cyanodithio imidocarbonate and L4 = dipotassium 2,2-dicyanoethylene-2,2-dithiolate were synthesized while four alkyl thiourea ligands, L5 = 1,3-dimethyl thiourea, L6 = 1,3-diethyl thiourea, L7 = 1,3-diisopropyl thiourea and L8 = 1-methyl thiourea were purchased and used as supplied without further purification. These ligands were used to prepare eight ruthenium(II) complexes of mixed bipyridyl/dithiolate/thiourea. The compounds were characterised by elemental analysis and spectroscopic techniques, namely: Fourier transform infrared (FTIR), Nuclear Magnetic Resonance (NMR), ultraviolet-visible and photoluminescence (PL). Cyclic voltammetry (CV) and square wave voltammetry (SWV) were used for the electrochemical studies. Photoluminescence and UV-Vis spectroscopies were used for geometric and photophysical studies of the complexes respectively. FTIR spectra confirmed presence of functional groups in ligands and coordination of these ligands to ruthenium(II) ions to form complexes. The UV-Vis confirmed that the Ru(II) dithiolene complexes exhibited square planar geometries while the Ru(II) thiourea complexes gave octahedral geometries, this was deduced from the transitions assigned to the complexes. All the ruthenium(II) complexes synthesized showed photoluminescence properties that are suitable for light harvesting and application for dye-sensitized solar cells. Cyclic and square wave voltammetry show Ru(II) thiourea complexes have better redox properties when compared to Ru(II) dithiolate complexes which is ascribed to ligand strength field possibly due to contribution from the two bonded NCS groups.
- Full Text:
The effectiveness of juvenile delinquents rehabilitation programmes in Zimbabwe : a case study of Harare Central Prison
- Authors: Nyakatawa, Rumbidzai
- Date: 2018
- Subjects: Juvenile delinquency Juvenile delinquents Rehabilitation
- Language: English
- Type: Thesis , Masters , MSoc
- Identifier: http://hdl.handle.net/10353/12436 , vital:39263
- Description: The Zimbabwe Prison and Correctional Services records show that there are around 300 children incarcerated every year. Most of these children commit crimes such as rape, murder, theft, possession of drugs due to issues like poverty, substance abuse, peer pressure and neglect. A number of these children face many forms of abuse in their homes, including physical, emotional, mental abuse as well as rape. The major aim of the study was to investigate the effectiveness of juvenile delinquents’ rehabilitation programmes at Harare Central Prison. The qualitative methodology was appropriate for this study because it gives in depth information through conducting interviews and focus groups with participants. The sampling procedure involved deliberate choice of an informant due to the qualities the informant possessed. A sample size of thirty-seven participants comprising sixteen juvenile delinquents, four social workers, five prison guards, five probation officers and seven community members, were selected for this study. Their perceptions provided baseline data that helped in gaining a deeper understanding of the juvenile rehabilitation programmes. Despite the findings, gaps remain in the current system, for instance children continue to spend prolonged periods of time in adult prisons while they await repatriation to institutions due to resource constraints, and the rehabilitation programmes have proved to be partially effective, yet at the same time the post rehabilitation programmes are not being provided to juveniles after their release from prison. Key recommendations include expanding the Pre-trial Diversion Programme to all the provinces as it has yielded results that benefit the child as well introduction of alternatives of institutionalisation.
- Full Text:
- Authors: Nyakatawa, Rumbidzai
- Date: 2018
- Subjects: Juvenile delinquency Juvenile delinquents Rehabilitation
- Language: English
- Type: Thesis , Masters , MSoc
- Identifier: http://hdl.handle.net/10353/12436 , vital:39263
- Description: The Zimbabwe Prison and Correctional Services records show that there are around 300 children incarcerated every year. Most of these children commit crimes such as rape, murder, theft, possession of drugs due to issues like poverty, substance abuse, peer pressure and neglect. A number of these children face many forms of abuse in their homes, including physical, emotional, mental abuse as well as rape. The major aim of the study was to investigate the effectiveness of juvenile delinquents’ rehabilitation programmes at Harare Central Prison. The qualitative methodology was appropriate for this study because it gives in depth information through conducting interviews and focus groups with participants. The sampling procedure involved deliberate choice of an informant due to the qualities the informant possessed. A sample size of thirty-seven participants comprising sixteen juvenile delinquents, four social workers, five prison guards, five probation officers and seven community members, were selected for this study. Their perceptions provided baseline data that helped in gaining a deeper understanding of the juvenile rehabilitation programmes. Despite the findings, gaps remain in the current system, for instance children continue to spend prolonged periods of time in adult prisons while they await repatriation to institutions due to resource constraints, and the rehabilitation programmes have proved to be partially effective, yet at the same time the post rehabilitation programmes are not being provided to juveniles after their release from prison. Key recommendations include expanding the Pre-trial Diversion Programme to all the provinces as it has yielded results that benefit the child as well introduction of alternatives of institutionalisation.
- Full Text:
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