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Call number: LD2668 .T4 1985 S364 / Master of Science

First year students at university level encounter various challenges that might impact on their success or failure. At this level, learning is fairly dependent on extensive and intensive reading, thus the reader should have an adequate vocabulary size to assist with the reading comprehension process. Knowledge of vocabulary (or words) is deemed an essential factor in reading proficiency, mainly because meaning is derived from words and also because of the connection between words and comprehension of text. This study investigated the particular relationship among vocabulary size and vocabulary depth and reading comprehension of 105 first year B.Ed. students majoring in English at a university in the North West Province. Also, the vocabulary test results of two different groups, first and fourth years, were compared to determine if advancement of vocabulary levels occur over the study period of four years. A quantitative research approach was used in which the study population was required to complete standardised vocabulary size and vocabulary depth tests, reading comprehension tests and a survey questionnaire. The results were statistically computed to determine the relationship between vocabulary size and breadth and reading comprehension. The results showed a positive and significant effect size correlation between vocabulary size and depth, and reading comprehension. The participants in the study were mainly Afrikaans speaking students who received their school education in Afrikaans. The instruments used in the research were the Vocabulary Levels test (Nation, 1990), Read’s Word Associates Test (1992) and TOEFL reading comprehension tests. The questionnaire was added to determine previous exposure to English and current reading habits of the participants. A two-tailed Pearson product moment correlation and multiple regression analyses were run in order to determine which of the variables, vocabulary size or depth, makes a more significant contribution to reading comprehension and also to establish which variable was the most significant predictor of academic success in the June examination. Vocabulary size was identified as predictor for success in the June examination; furthermore, if gender is used as independent variable, different vocabulary size tests are identified for males and females. / MEd (Curriculum Development), North-West University, Potchefstroom Campus, 2015

This dissertation undertakes an analysis of the spatial persistence of population in South Africa over the period 1911 to 2011. A comprehensive review is given of the history and development of geographical economics in order to understand the dynamics of the forces of agglomeration. In addition the history of the development of South Africa is discussed and special focus is directed to the geographical, economic and political factors that gave rise to the unequal distribution of population and wealth in the country. In the empirical analysis Zipf’s law was applied and it was found that South Africa’s population was more evenly spread in 1911. With the application of the law to the 2011 data the Pareto exponent of the OLS log-linear regression indicated that urban agglomeration was more persistent. Although this might indicate that apartheid did not influence agglomeration in South Africa it is argued that the nature of the agglomeration was in fact influenced by restrictive measures placed on the urbanisation of the population and industrial decentralisation policies. It is indicated that the apartheid policy altered the equilibrium spatial distribution of population and wealth which lead to a smaller than optimal primate and second largest magisterial districts, too many secondary cities of similar size, and also too many small and uneconomical rural settlements. / MCom (Economics), North-West University, Potchefstroom Campus, 2015

First year students at university level encounter various challenges that might impact on their success or failure. At this level, learning is fairly dependent on extensive and intensive reading, thus the reader should have an adequate vocabulary size to assist with the reading comprehension process. Knowledge of vocabulary (or words) is deemed an essential factor in reading proficiency, mainly because meaning is derived from words and also because of the connection between words and comprehension of text. This study investigated the particular relationship among vocabulary size and vocabulary depth and reading comprehension of 105 first year B.Ed. students majoring in English at a university in the North West Province. Also, the vocabulary test results of two different groups, first and fourth years, were compared to determine if advancement of vocabulary levels occur over the study period of four years. A quantitative research approach was used in which the study population was required to complete standardised vocabulary size and vocabulary depth tests, reading comprehension tests and a survey questionnaire. The results were statistically computed to determine the relationship between vocabulary size and breadth and reading comprehension. The results showed a positive and significant effect size correlation between vocabulary size and depth, and reading comprehension. The participants in the study were mainly Afrikaans speaking students who received their school education in Afrikaans. The instruments used in the research were the Vocabulary Levels test (Nation, 1990), Read’s Word Associates Test (1992) and TOEFL reading comprehension tests. The questionnaire was added to determine previous exposure to English and current reading habits of the participants. A two-tailed Pearson product moment correlation and multiple regression analyses were run in order to determine which of the variables, vocabulary size or depth, makes a more significant contribution to reading comprehension and also to establish which variable was the most significant predictor of academic success in the June examination. Vocabulary size was identified as predictor for success in the June examination; furthermore, if gender is used as independent variable, different vocabulary size tests are identified for males and females. / MEd (Curriculum Development), North-West University, Potchefstroom Campus, 2015

This dissertation undertakes an analysis of the spatial persistence of population in South Africa over the period 1911 to 2011. A comprehensive review is given of the history and development of geographical economics in order to understand the dynamics of the forces of agglomeration. In addition the history of the development of South Africa is discussed and special focus is directed to the geographical, economic and political factors that gave rise to the unequal distribution of population and wealth in the country. In the empirical analysis Zipf’s law was applied and it was found that South Africa’s population was more evenly spread in 1911. With the application of the law to the 2011 data the Pareto exponent of the OLS log-linear regression indicated that urban agglomeration was more persistent. Although this might indicate that apartheid did not influence agglomeration in South Africa it is argued that the nature of the agglomeration was in fact influenced by restrictive measures placed on the urbanisation of the population and industrial decentralisation policies. It is indicated that the apartheid policy altered the equilibrium spatial distribution of population and wealth which lead to a smaller than optimal primate and second largest magisterial districts, too many secondary cities of similar size, and also too many small and uneconomical rural settlements. / MCom (Economics), North-West University, Potchefstroom Campus, 2015

Doctor of Philosophy / Department of Animal Sciences and Industry / Joe D. Hancock / A total of 2,840 1-d-old broiler chicks and 450 1-d-old layer chicks were used in three experiments to determine the nutritional value of corn- and sorghum-based diets in poultry reared in West Africa. In the broiler experiments, birds fed corn had greater average daily gain (P < 0.001) with similar carcass weight and yield for birds fed corn- vs sorghum-based diets (P > 0.18). Particle size treatments did not affect growth performance or carcass characteristics (P > 0.20). In the layer experiment, birds fed sorghum had greater body weight at d 126 (P < 0.001), started laying earlier (P < 0.01), ate more feed (P < 0.01), and produced more eggs (P < 0.01) than birds fed the corn-based diet. However, there was no difference in average egg weight among birds fed corn vs sorghum (P > 0.85). In conclusion, sorghums produced in West Africa are a good alternative to corn when fed to broiler chicks and laying hens.

Master of Science / Department of Agricultural Economics / Hikaru H. Peterson / Alexander E. Saak / Notable changes are occurring in the U.S. organic food sector. First, the U.S. organic food system is increasingly relying on imports, because the expansion in the organic production has failed to satisfactorily meet the rapidly growing demand for organic foods. Second, the “locally grown” concept has become appealing to consumers, with some evidence of consumers switching from certified organic foods to local, conventional foods. Third, organic food has penetrated the mass-market channel, and organic foods are no longer being sold exclusively in natural product stores. And fourth, the social and environmental awareness among consumers is increasing. Thus, consumers are also willing to pay a price premium to support small farmers. To understand how these changes are affecting the demand for organic foods, this study used survey data to assess U.S. consumers‟ preferences for fresh organic apples that are sourced from various places and from supply chain operations that vary in scale. The survey was administered via the Internet to a random sample of 285 households across the U.S through a research company. Choice experiment was selected as the valuation method. Results indicate that among the levels of the location attributes, the “locally grown” label was associated with the highest average WTP. The “regionally grown” was the second most preferred, “U.S. grown” the third, and “imported” the least. The “locally grown” label was valued higher than the “certified organic label”. Also, consumers were willing to pay a higher value for apples produced on a small farm compared to those from a large farm. However, they did not distinguish the type of retail outlets where apples were offered. The analysis incorporating the effects of consumer characteristics suggest that the perceived importance of public benefits impacted the values of origin attributes more than the private ones; the type of retail outlet attributes became significant among certain gender and age segments; and the value of small farm attribute increased with consumers‟ income. Finally, results from a theoretical model suggest that the variability in the WTP obtained among the origin attributes could be explained by the reputation of product quality depending on their origin.

This research compared the use of an electronic meeting system tool to a manual group process in large and small groups in a controlled laboratory experiment. Outcomes measured include the quality of decision, the time taken in various stages of the decision making process, and group member satisfaction. A research model of the variables influencing group decision making was developed. The six independent variables included in this model are group size, the rule by which the group makes a decision, the incentives driving the group, the distribution of useful information within the group, the task complexity, and the meeting support (electronic or manual). In this research group size and method of support were manipulated, while the other variables were controlled. A decision-making task was developed for this research to specify and manipulate the six independent variables. The task described a product mix problem in which information on each product was given to group members. The group shared information and jointly determined an outcome. The group used an unanimous decision rule to choose a solution. A numerical outcome was used to objectively measure decision quality. Each member of the group received a cash payoff determined by the group's solution as incentive in accomplishing the task. All groups found the optimal solution. The simplicity of the task may have minimized the differences found between groups. There was no significant difference in general member satisfaction or time to decision. Prior knowledge was found to influence general member satisfaction and the time needed for the group to share information. Members of large groups perceived more uneven distribution of participation than members of small groups. Voting differences were very large: large groups took significantly more votes than small groups, and electronic groups took significantly more votes than manual groups. "Conjunctive" and "disjunctive" task descriptions are used to discuss task/tool interaction.

Aim: The purpose of this study is to present and test an algorithm that gives acceptable solutions in the optimization of a dedicated production line consisting of several machines, with regards of inventory holding cost and available capacity. The aim is also to suggest possible improvements in the practical case that has been used to test the model, which have been made in cooperation with Sandvik Materials Technology and it’s product unit Rock Drill Steel, located in Sandviken, Sweden. Method: An algorithm has been elaborated from articles and science reports and has then been tested with data from the practical case. The result has then been evaluated through an analysis where the algorithm’s ability to acceptable solutions and show potential savings with regards to capital tied up in stock of finished products, safety stock and products in work in process. Results and conclusions: The study shows that the algorithm has the ability to create acceptable solutions when given a specific demand rate, cycle time and capacity. The study also shows potential savings when using a shorter production cycle, given that the unit works in a structured way in order to shorten the production cycle. Suggestions for future research: The algorithm tested in this study needs more evaluations regarding its limits and possible benefits through practical and theoretical case studies. Contributions: The algorithm the possibility to combine principles and models aimed at solving the ELSP (Economic Lot Schedule Problem) and the principles of Schedule Leveling, which is a common term in lean production to a model that optimize inventory holding costs. These theories have similar approaches to cyclic production, but have different aims. Key words: cyclic scheduling, ELSP, economic lot size problem, schedule leveling, heijunka, lean production / Titel: Optimering och balansering av cyklisk produktion - en studie på Sandvik Materials Technology PU Borrstål Nivå: C-uppsats i ämnet Industriell Ekonomi Författare: Tommy Hedlund, Daniel Kvarnlöf Handledare: Mohammad Abid Datum: 2016 - Mars Syfte: Studiens syfte är att presentera och testa en algoritm som ger godkända resultat vid optimering av en dedikerad produktionslina bestående av flera produktionsresurser, med avseende på lagerhållningskostnad i omsättningslager samt tillgänglig kapacitet, samt att presentera möjliga förbättringsförslag utifrån de resultat som ges i det praktiska fall som simuleringsmodellen utvärderas genom. Det praktiska fallet i denna studie är Sandvik Materials Technology och dess produktenhet Borrstål. Metod: Studien har genomförts genom att en algoritm har tagits fram utifrån artiklar och forskningsrapporter på området, som sedan har prövats mot studiens praktiska fall. Resultatet har sedan utvärderats genom en analys av algoritmens förmåga att ge godkända lösningar, samt möjlig besparingspotential i det aktuella fallet utifrån kapitalbindning i omsättningslager, säkerhetslager och produkter i arbete. Resultat &amp; slutsats: Studien visar att algoritmen har en god förmåga att skapa godkända resultat utifrån en specifik efterfrågan, cykeltid och kapacitet. Studien visar även på stora potentiella besparingar i kapitalbindning till följd av kortare cykeltid i såväl omsättningslager, säkerhetslager och produkter i arbete, givet att produktenheten arbetar strukturerat med att söka minska cykeltiden. Förslag till fortsatt forskning: Algoritmen behöver ytterligare forskning kring dess begränsningar genom att utvärderas utifrån fler praktiska och teoretiska fall. Uppsatsens bidrag: Algoritmen visar på en möjlighet att kombinera ELSP (economic lot scheduling problem) och dess modeller med de principer som återfinns inom Schedule Leveling, som är ett vanligt begrepp inom lean production. Dessa teorier liknar varandra men har till viss del skilda syften, vilka kan kombineras till en modell som optimerar produktionen med avseende på lagerhållningskostnaderna.