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Search Results: 1 - 10 of 2098 matches for " ME Moeletsi "
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Rainy season characteristics of the Free State Province of South Africa with reference to rain-fed maize production
ME Moeletsi, S Walker
Water SA , 2012,
Abstract: The study assesses onset of rains, cessation of rains, duration of rainy season and seasonal rainfall at different probability levels. Daily rainfall data for 309 stations located in the Free State Province of South Africa were analysed from 1950 to 2008. The cumulative rainfall over 3 consecutive dekads (10-day periods) and cumulative rainfall over 1 dekad were used to determine onset of rains and cessation of rains respectively. Seasonal rainfall was determined as the accumulated rainfall from November to March. Rainbow statistical software was utilised to test for normality and determine probabilities at 20%, 50% and 80% risk levels. The other rainy season characteristics investigated were the probability of onset failure and probability of rainy season duration of less than 50, 100, 120 and 140 days. These rainy season indices were investigated in relation to maize production in the Free State. Rainfall behaviour during the growing period is one of the main limiting factors to rain-fed maize production, consequently influencing household food security. The results show that for onset of rains there is a large spatial variance over the Free State while cessation of rains shows small variance. There is also an east to west progression of onsets while the duration of the rainy season and seasonal rainfall also increased from west to east. Areas of low risk associated with rainy season characteristics are evident over the Thabo Mofutsanyane, eastern Motheo, eastern and northeastern Lejweleputswa and the Fezile Dabi districts, making these areas highly suitable for maize production. By contrast, high-risk areas are in the western and southern parts of the province and thus dryland maize production has low production potential in these areas.
Editorial: Is Electroconvulsive Therapy a Therapy with Future?  [PDF]
Jér?me Palazzolo
Open Journal of Depression (OJD) , 2013, DOI: 10.4236/ojd.2013.23004
Abstract: Editorial: Is Electroconvulsive Therapy a Therapy with Future?
Urban Wastewater Treatment by Adsorption of Organic Matters on Modified Bentonite by (Iron-Aluminum)  [PDF]
Me?abih Zohra, Jér?me Rose, Daniel Borschneck
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2014, DOI: 10.4236/jeas.2014.43008
Abstract: In this research, the natural bentonite clay (from Maghnia, western Algeria) was purified (Na+- montmorillonite, CEC = 91 meq/100 g), noted (puri.bent) and modified with mixed hydroxy-Fe-Al (FeAl-PILC). The purified bentonite clay and FeAl-PILC were heated at 383 K for 2 hr and characte-rized by the chemical analyses data, XRD, and N2 adsorption to 77 K techniques. Puri.bent and FeAl-PILC were applied to fix the organic matter (OM) present in urban wastewater from the city of Sidi Bel-Abbes (western Algeria). The adsorption of organic matter was followed by spectro-photometry at 470 nm, and the adsorption data were a good fit with Freundlich isotherm for pu-ri.bent but for FeA-lPILC, were well fit by Elovitch isotherm model. The maximum adsorption ca-pacity (qm) was 571.6 mg/g for puri.bent and 1120.69 mg/g for FeAl-PLC. The degree of OM removal was 67% for puri.bent and 97% for FeAl-PILC. FeAl-PILC can be considered as a promising adsorbent for the removal of OM from wastewater.
How to prevent and treat an allergic crisis
ME Levin
Continuing Medical Education , 2013,
Abstract: Anaphylaxis, the most serious of the allergic conditions, is a sudden, severe, potentially fatal systemic reaction. It may involve the skin, respiratory tract, gastrointestinal tract or cardiovascular system. Symptoms occur within minutes to two hours a er contact with the allergy-causing substance. CME January 2013 Vol. 31 No. 1
Effects of Reformulation of Knowledge and Expository Teaching Strategies on Students’ Performance in Chemistry
ME Udo
African Research Review , 2011,
Abstract: This quasi-experimental study conducted in 2 co-educational secondary schools in Uyo Local Government Area of Akwa Ibom State, Nigeria investigated the effectiveness of reformulation of knowledge teaching approach in facilitating students’ achievement in chemistry compared with the traditional expository method considering their gender differences. Two research questions and two hypotheses guided the study. The sample consisted of 96 students (51males and 45 females). The instrument for data collection was a 25-item multiple choice questions – Chemistry Achievement Test (CAT) – with a reliability index of 0.72. Validated researcher-made instructional packages on reformulation and expository methods were used in teaching the concept of properties and reactions of water to the subjects in their intact class setting. The results of analyses of data using Analysis of Covariance (ANCOVA) showed that those taught using reformulation of knowledge approach performed significantly better than those taught using the expository method; and that gender is not a significant determinant of students’ performance in chemistry. Consequently, it was recommended that chemistry teachers should make effective use of this approach in teaching chemistry concepts in view of its high facilitative effect.
Le renouvellement du "terrain". Quelques considérations sur l'évolution des méthodes ethnographiques
ME Gruenais
African Anthropologist , 2002,
Abstract:
Reducing chronic diseases of lifestyle and managing HIV using an evidence-based approach — what every clinician should know
ME Visser
Continuing Medical Education , 2003,
Abstract:
Effect of Guided-Discovery, Student- Centred Demonstration and the Expository Instructional Strategies on Students' Performance in Chemistry
ME Udo
African Research Review , 2010,
Abstract: This study investigated the relative effectiveness of guided-discovery,student-centred demonstration and expository methods of instruction onstudents performance in chemistry. It was a quasi-experimental research using non-randomized- pre-test post-test control group design with expository method as control. Two research questions and two hypotheses were formulated for answering and testing respectively. A sample of 118 SS2 chemistry students (62 males and 56 females) drawn from 3-co educational public secondary schools in Uyo Local Government Area of Akwa Ibom State was used for the study. Criterion sampling technique was used in selecting the sample. A researcher- developed test Chemistry Achievement Test (CAT), with a reliability index of 0.78 determined using test-retest method was used in collecting relevant data. After classroom investigations, the results indicated that guided discovery was the most effective followed by student-centred demonstration. Consequently, it has been recommended thatchemistry teachers in secondary schools make effective use of guideddiscovery and student-centred-demonstration methods in communicating chemistry concepts and inculcating relevant entrepreneurial skills in learners.
Performance in Art Nature and Meaning among Fine/Applied Arts and Theatre Arts Undergraduates in Nigeria: A Case of University of Benin
ME Imonikebe
African Research Review , 2012,
Abstract: The study investigated the difference in performance in Art, Nature and Meaning between Fine/Applied Arts and Theatre Arts undergraduates in the University of Benin. The study was designed to find out if there is a difference in performance between undergraduates of Fine/Applied Arts and Theatre Arts in Art, Nature and Meaning and if the level of difficulty of Art, Nature and meaning has any influence on the students performance. The study was delimited to undergraduates in Fine/Applied Arts and Theatre Arts who registered for Art, Nature and Meaning in the University of Benin. As a result, two Research Questions were raised. It was discovered that there is no significant difference in performance in Art, Nature and Meaning between undergraduates of Fine/Applied Arts and Theatre Arts in University of Benin. Data for this study were generated from official records of the two departments under investigation. In other words, scores of candidates duly approved by the Departmental Boards of Examiners of the two departments were obtained for the study. The statistical technique adopted for data analysis was the t-test for independence samples and it was found out that there was no significant difference in performance in Art nature and meaning between undergraduates of Fine/Applied Arts and Theatre Arts. Consequently it was concluded that, the performance of the groups was not different.
Effects of Problem-Solving, Guided-Discovery and Expository Teaching Strategies on Students' Performance in Redox Reactions
ME Udo
African Research Review , 2011,
Abstract: This study investigated the relative effectiveness of problem-solving, guideddiscovery, and expository methods of instruction on students performance in redox reaction, considering their mathematics ability. It was a quasiexperimental research using non-randomized-pre-test post-test control group design with expository method as control. Two research questions and two hypotheses were formulated for answering and testing, respectively. A sample of 120 SS2 chemistry students drawn from 3-co educational public secondary schools in Uyo Local Government Area of Akwa Ibom State was used for the study. Criterion sampling technique was used in selecting the sample. Two researcher- developed tests Chemistry Achievement Test (CAT) and Mathematical Ability Test (MAT), with reliability indices of 0.76 and 0.68, respectively, determined using test-retest method were used in collecting relevant data. After investigations, the results showed that those taught using problem-solving method performed significantly better than those taught with guided-discovery and expository methods; expository approach was the least facilitative. Students performance was observed not to be dependent on their mathematics ability. Consequently, it has beenrecommended that Chemistry teachers should always adopt problem-solving teaching approach in teaching redox reaction and other quantitative concepts in chemistry in view of its high facilitative effect on the students performance.
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