Bulletin of the Chemical Society of Ethiopia, 2002
In this paper, we report a range of factors which affect the retention of colloidal particles in ... more In this paper, we report a range of factors which affect the retention of colloidal particles in thermal field-flow fractionation (ThFFF). These results are observed among different sizes of polystyrene (PS) latex particles suspended in both aqueous and nonaqueous liquid carriers and very low density lipoproteins in a phosphate buffer. These factors include particle size and chemical composition, field strength, cold-wall temperature of the channel and the nature of the suspension medium. These results show that ThFFF can be used to fractionate colloidal particles according to size and that for an unknown colloidal sample material, a calibration curve must be obtained using particles of similar composition. This is necessary because the degree of retention of the colloidal material is dependent on chemical composition of sample material as evidenced by the chemical composition study. The potential of using ThFFF for physico-chemical characterization of colloidal material is illustra...
This study investigated the relationship between variety of learning resources and students' ... more This study investigated the relationship between variety of learning resources and students' academic performance. The objective of the study was to assess the influence that access to a variety of learning resources has on students' academic performance in geography in the Kenya Certificate of Secondary Education (KCSE) in public secondary schools in Makueni County. The study was guided by the Classroom Instruction Theory using the descriptive survey design. Both stratified and simple random sampling methods were applied in drawing a sample. Data was collected from 422 respondents who included 29 principals, 30 teachers of geography and 363 Form Three students. Data was collected using questionnaires and an observation checklist. Questionnaires were used to collect data from principals, teachers and students. The observation checklist was used in observing geography lessons. Both descriptive and inferential statistics were used to analyse collected data and included means f...
A Thesis Submitted in Partial Fulfillment of the Requirements for the Award of the Degree of Doct... more A Thesis Submitted in Partial Fulfillment of the Requirements for the Award of the Degree of Doctor of Philosophy (PhD) (Curriculum Studies), Kenyatta University. July, 2016
This study investigated the relationship between variety of learning resources and studentss acad... more This study investigated the relationship between variety of learning resources and studentss academic performance. The objective of the study was to assess the influence that access to a variety of learning resources has on students academic performance in geography in the Kenya Certificate of Secondary Education (KCSE) in public secondary schools in Makueni County. The study was guided by the Classroom Instruction Theory using the descriptive survey design. Both stratified and simple random sampling methods were applied in drawing a sample. Data was collected from 422 respondents who included 29 principals, 30 teachers of geography and 363 Form Three students. Data was collected using questionnaires and an observation checklist. Questionnaires were used to collect data from principals, teachers and students. The observation checklist was used in observing geography lessons. Both descriptive and inferential statistics were used to analyse collected data and included means frequencie...
Bulletin of the Chemical Society of Ethiopia, 2002
In this paper, we report a range of factors which affect the retention of colloidal particles in ... more In this paper, we report a range of factors which affect the retention of colloidal particles in thermal field-flow fractionation (ThFFF). These results are observed among different sizes of polystyrene (PS) latex particles suspended in both aqueous and nonaqueous liquid carriers and very low density lipoproteins in a phosphate buffer. These factors include particle size and chemical composition, field strength, cold-wall temperature of the channel and the nature of the suspension medium. These results show that ThFFF can be used to fractionate colloidal particles according to size and that for an unknown colloidal sample material, a calibration curve must be obtained using particles of similar composition. This is necessary because the degree of retention of the colloidal material is dependent on chemical composition of sample material as evidenced by the chemical composition study. The potential of using ThFFF for physico-chemical characterization of colloidal material is illustra...
This study investigated the relationship between variety of learning resources and students' ... more This study investigated the relationship between variety of learning resources and students' academic performance. The objective of the study was to assess the influence that access to a variety of learning resources has on students' academic performance in geography in the Kenya Certificate of Secondary Education (KCSE) in public secondary schools in Makueni County. The study was guided by the Classroom Instruction Theory using the descriptive survey design. Both stratified and simple random sampling methods were applied in drawing a sample. Data was collected from 422 respondents who included 29 principals, 30 teachers of geography and 363 Form Three students. Data was collected using questionnaires and an observation checklist. Questionnaires were used to collect data from principals, teachers and students. The observation checklist was used in observing geography lessons. Both descriptive and inferential statistics were used to analyse collected data and included means f...
A Thesis Submitted in Partial Fulfillment of the Requirements for the Award of the Degree of Doct... more A Thesis Submitted in Partial Fulfillment of the Requirements for the Award of the Degree of Doctor of Philosophy (PhD) (Curriculum Studies), Kenyatta University. July, 2016
This study investigated the relationship between variety of learning resources and studentss acad... more This study investigated the relationship between variety of learning resources and studentss academic performance. The objective of the study was to assess the influence that access to a variety of learning resources has on students academic performance in geography in the Kenya Certificate of Secondary Education (KCSE) in public secondary schools in Makueni County. The study was guided by the Classroom Instruction Theory using the descriptive survey design. Both stratified and simple random sampling methods were applied in drawing a sample. Data was collected from 422 respondents who included 29 principals, 30 teachers of geography and 363 Form Three students. Data was collected using questionnaires and an observation checklist. Questionnaires were used to collect data from principals, teachers and students. The observation checklist was used in observing geography lessons. Both descriptive and inferential statistics were used to analyse collected data and included means frequencie...
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