This paper presented a new Model-free Controller for speed control of Direct-Current (DC) motors. The design objectives were to combine the benefits of proportional-integralderivative (PID) controllers (simplicity in the structure and the usage) and performances of the advanced controllers such as linear-quadratic regulator (LQR), Fuzzy Logic Controllers (FLC), with the advantage of not depending on the model. The Model free Lag-Lead controller (MFLL) is compared against the Fuzzy, LQR, PI controllers for speed regulation of DC Motor and showed the ability to produce better performances. The MFLL is also easy to design and to tune without any special rule, and can be implemented by non-professional.Key words: Direct current (DC) motor, Fuzzy Logic controller (FLC), Linear-quadratic regulator (LQR), Model-free controller, Proportional Integral Derivative controller (PID).
{"title":"Design and simulation of model-free lag-lead controller for DC motor speed control","authors":"D. Monjengue","doi":"10.4314/stech.v8i1.7","DOIUrl":"https://doi.org/10.4314/stech.v8i1.7","url":null,"abstract":"This paper presented a new Model-free Controller for speed control of Direct-Current (DC) motors. The design objectives were to combine the benefits of proportional-integralderivative (PID) controllers (simplicity in the structure and the usage) and performances of the advanced controllers such as linear-quadratic regulator (LQR), Fuzzy Logic Controllers (FLC), with the advantage of not depending on the model. The Model free Lag-Lead controller (MFLL) is compared against the Fuzzy, LQR, PI controllers for speed regulation of DC Motor and showed the ability to produce better performances. The MFLL is also easy to design and to tune without any special rule, and can be implemented by non-professional.Key words: Direct current (DC) motor, Fuzzy Logic controller (FLC), Linear-quadratic regulator (LQR), Model-free controller, Proportional Integral Derivative controller (PID).","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131055858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Water hyacinth is an exotic freshwater weed damaging wetland resources over the Lake Tana basin, Ethiopia. Different measures, including manual labour and harvesting machinery are in use to reduce its damage and expansion. Yet, the invasion of the weed appears expanding its scope across the wetlands of the Lake. This paper presented the study made to identify determinant factors affecting manual control of water hyacinth expansion over the Lake wetlands. It tried to analyse the expansion trend of the water hyacinth and community efforts to control its extension. Data were gathered from questionnaire surveys, group discussions, interviews and field observations. Descriptive statistics and binary logistic regression were used for data analysis. The study revealed that the water hyacinth cover in the Lake’s wetland increased from ≤10, 000 ha in 2011 to over 50, 000 ha in 2017. Wetland terrain, water depth, food availability, farming time, employment and government support were found significantly influencing the manual control practices of households. Hence, government support must increase to motivate people involvement in manual weed removal campaigns. Micro-relief maps and floating boats need be readily available to help participants easily identify risky terrains and expand the physical weed removal into the deeper waters.Key Words: Water hyacinth, Invasive weeds, Manual control, Wetlands, Lake Tana, Ethiopia
{"title":"Determinants of manual control of water hyacinth expansion over the Lake Tana, Ethiopia","authors":"M. Yitbarek, M. Belay, A. Bazezew","doi":"10.4314/stech.v8i1.1","DOIUrl":"https://doi.org/10.4314/stech.v8i1.1","url":null,"abstract":"Water hyacinth is an exotic freshwater weed damaging wetland resources over the Lake Tana basin, Ethiopia. Different measures, including manual labour and harvesting machinery are in use to reduce its damage and expansion. Yet, the invasion of the weed appears expanding its scope across the wetlands of the Lake. This paper presented the study made to identify determinant factors affecting manual control of water hyacinth expansion over the Lake wetlands. It tried to analyse the expansion trend of the water hyacinth and community efforts to control its extension. Data were gathered from questionnaire surveys, group discussions, interviews and field observations. Descriptive statistics and binary logistic regression were used for data analysis. The study revealed that the water hyacinth cover in the Lake’s wetland increased from ≤10, 000 ha in 2011 to over 50, 000 ha in 2017. Wetland terrain, water depth, food availability, farming time, employment and government support were found significantly influencing the manual control practices of households. Hence, government support must increase to motivate people involvement in manual weed removal campaigns. Micro-relief maps and floating boats need be readily available to help participants easily identify risky terrains and expand the physical weed removal into the deeper waters.Key Words: Water hyacinth, Invasive weeds, Manual control, Wetlands, Lake Tana, Ethiopia","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132011471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Daramola, B. Fashoto, T. Ogunbiyi, N. M. Ekpeni
Agriculture is the major income source in Nigeria’s rural areas. Climatic variability and rising cost of agricultural inputs and household consumables without corresponding rise in agricultural product prices are however driving noted rural farmers to adopt alternative livelihood strategies. Charcoal production has now become a significant source of supplementary income for residents of rural communities in several parts of Nigeria. This study assessed the role of non-farm sources in household income diversification in Oyo state with focus on the contribution of charcoal production and its implication for sustainable development. Participatory rural appraisal techniques of Focus Group Discussion (FGD) and structured interview/questionnaire were adopted. Results of the social survey indicated that farming is still the dominant activity in the region with about 80% of the respondents involved. Households employed an average of 2 income activities with share of off-farm income and Herfindahl Diversification Index of 0.68 and 0.78 respectively, showing a high magnitude of diversification. An adaptation cycle was also constructed based on their current realities, to guide specific interventions. Formalization of production activities and development of other economic activities were suggested to ensure sustainability of forest resources in the area.Key Words: Agriculture, Charcoal, Household income, Forest management
{"title":"An assessment of the role of non-farm sources in household income diversification in Oyo State","authors":"A. Daramola, B. Fashoto, T. Ogunbiyi, N. M. Ekpeni","doi":"10.4314/stech.v8i1.8","DOIUrl":"https://doi.org/10.4314/stech.v8i1.8","url":null,"abstract":"Agriculture is the major income source in Nigeria’s rural areas. Climatic variability and rising cost of agricultural inputs and household consumables without corresponding rise in agricultural product prices are however driving noted rural farmers to adopt alternative livelihood strategies. Charcoal production has now become a significant source of supplementary income for residents of rural communities in several parts of Nigeria. This study assessed the role of non-farm sources in household income diversification in Oyo state with focus on the contribution of charcoal production and its implication for sustainable development. Participatory rural appraisal techniques of Focus Group Discussion (FGD) and structured interview/questionnaire were adopted. Results of the social survey indicated that farming is still the dominant activity in the region with about 80% of the respondents involved. Households employed an average of 2 income activities with share of off-farm income and Herfindahl Diversification Index of 0.68 and 0.78 respectively, showing a high magnitude of diversification. An adaptation cycle was also constructed based on their current realities, to guide specific interventions. Formalization of production activities and development of other economic activities were suggested to ensure sustainability of forest resources in the area.Key Words: Agriculture, Charcoal, Household income, Forest management","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125582356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study is based upon the conception that students perform poorly in computer-based examinations. The study therefore investigated on the factors that influence the acquisition of computer-based test training using chemistry education students in Anambra state Colleges of Education. In each of the factors identified there was no significant difference on the response of the students in both Colleges of Education. Concerted efforts by the students, themselves, trainers and students’ institutions were advocated towards improving the training of CBT to enhance achievement in CBT examinations.Key Words: Computer based training, assessment, formative examination
{"title":"Factors influencing the acquisition of compuerbased test training by chemistry students of Anambra State Colleges of Education","authors":"E. N. Igboegwu","doi":"10.4314/stech.v8i1.2","DOIUrl":"https://doi.org/10.4314/stech.v8i1.2","url":null,"abstract":"This study is based upon the conception that students perform poorly in computer-based examinations. The study therefore investigated on the factors that influence the acquisition of computer-based test training using chemistry education students in Anambra state Colleges of Education. In each of the factors identified there was no significant difference on the response of the students in both Colleges of Education. Concerted efforts by the students, themselves, trainers and students’ institutions were advocated towards improving the training of CBT to enhance achievement in CBT examinations.Key Words: Computer based training, assessment, formative examination","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114443651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rainfall variability in terms of amount, distribution (spatial, seasonal and diurnal), intensity and frequency of rainy days influence crop production and yield. This paper examined rainfall temporal trend inter-annual and spatial distribution and the implication of mean annual rainfall on maize and rice yield in North – Central Geopolitical Region of Nigeria. Daily rainfall records of thirty years period (1987 – 2016) at six stations in the region, namely; Abuja, Ilorin, Jos, Lokoja, Makurdi and Minna were obtained from the archive of the Nigerian Meteorological Agency (NiMet), Abuja and maize and rice yield for the period 1994 – 2016 obtained from the Bureau of Statistics of Nigeria were used for the study. The rainfall data were subjected to statistical analysis using descriptive analysis. Mann-Kendal test and Kriging method were used for the spatio–temporal rainfall distribution while the impact of rainfall amount on maize and rice yields was investigated using regression analysis. The annual rainfall amount experienced in study area was between 1100 mm and 1700 mm. Out of the six stations studied; only Abuja indicated statistically significant increased trend while the other five stations in the region showed no significant trend. Rainfall distribution in the region is largely influence by the Jos Plateau rather than Latitudes or Longitude. Generally, rainfall influences maize and rice yield positively but at varying degree from station to stationKeywords: Rainfall variability, Trend, Distribution, Impact
{"title":"Rainfall variability and the impact on maize and rice yields in north – central Nigeria","authors":"G. H. Ntat, S. Ojoy, Y. Suleiman","doi":"10.4314/STECH.V7I2.4","DOIUrl":"https://doi.org/10.4314/STECH.V7I2.4","url":null,"abstract":"Rainfall variability in terms of amount, distribution (spatial, seasonal and diurnal), intensity and frequency of rainy days influence crop production and yield. This paper examined rainfall temporal trend inter-annual and spatial distribution and the implication of mean annual rainfall on maize and rice yield in North – Central Geopolitical Region of Nigeria. Daily rainfall records of thirty years period (1987 – 2016) at six stations in the region, namely; Abuja, Ilorin, Jos, Lokoja, Makurdi and Minna were obtained from the archive of the Nigerian Meteorological Agency (NiMet), Abuja and maize and rice yield for the period 1994 – 2016 obtained from the Bureau of Statistics of Nigeria were used for the study. The rainfall data were subjected to statistical analysis using descriptive analysis. Mann-Kendal test and Kriging method were used for the spatio–temporal rainfall distribution while the impact of rainfall amount on maize and rice yields was investigated using regression analysis. The annual rainfall amount experienced in study area was between 1100 mm and 1700 mm. Out of the six stations studied; only Abuja indicated statistically significant increased trend while the other five stations in the region showed no significant trend. Rainfall distribution in the region is largely influence by the Jos Plateau rather than Latitudes or Longitude. Generally, rainfall influences maize and rice yield positively but at varying degree from station to stationKeywords: Rainfall variability, Trend, Distribution, Impact","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115417786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigated the integration of information and communication technology (ICT) for Social Studies teaching in Upper Basic Schools in Edo State Nigeria. Descriptive survey design was used for the study. Four Objectives and four research questions guided the study. The population for the study was Social Studies teachers in Upper Basic Schools in Edo State. A sample size of 300 Social Studies teachers was purposively selected for the study, representing 48.39% of the population. A 32-item questionnaire was used as instrument, which was validated by two experts’ in the field of measurement and evaluation. Test retest method was used to determine the reliability of the instrument, 0.85 reliability coefficient index was obtained using Pearson Product Moment Correlation formula. Mean and standard deviation were used to analyse the research questions. The first finding was that ICT facilities are available for integration into teaching of Social Studies to a low extent. Secondary, ICT facilities are utilized for lesson delivery by Social Studies teachers on a low extent. Effort should be made by government to provide ICT facilities, monitor and organize workshops/seminars for Social Studies Teachers and address the challenges facing ICT facilities utilization in Edo State to facilitate its integration. These will go a long way to ensure effective teaching delivery of Social Studies in Upper Basic Schools in Edo State.Keywords: integration, information and communication technology, Social Studies
{"title":"Integration of information and communication technology for teaching social studies in upper basic schools in Edo State","authors":"C. E. Omokhua, A. Nwanekezi","doi":"10.4314/stech.v7i2.11","DOIUrl":"https://doi.org/10.4314/stech.v7i2.11","url":null,"abstract":"This study investigated the integration of information and communication technology (ICT) for Social Studies teaching in Upper Basic Schools in Edo State Nigeria. Descriptive survey design was used for the study. Four Objectives and four research questions guided the study. The population for the study was Social Studies teachers in Upper Basic Schools in Edo State. A sample size of 300 Social Studies teachers was purposively selected for the study, representing 48.39% of the population. A 32-item questionnaire was used as instrument, which was validated by two experts’ in the field of measurement and evaluation. Test retest method was used to determine the reliability of the instrument, 0.85 reliability coefficient index was obtained using Pearson Product Moment Correlation formula. Mean and standard deviation were used to analyse the research questions. The first finding was that ICT facilities are available for integration into teaching of Social Studies to a low extent. Secondary, ICT facilities are utilized for lesson delivery by Social Studies teachers on a low extent. Effort should be made by government to provide ICT facilities, monitor and organize workshops/seminars for Social Studies Teachers and address the challenges facing ICT facilities utilization in Edo State to facilitate its integration. These will go a long way to ensure effective teaching delivery of Social Studies in Upper Basic Schools in Edo State.Keywords: integration, information and communication technology, Social Studies","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114391652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Energy is one of the major inputs for the economic development of any country, thus lack of efficient and effective utilization of energy is a major concern in high-energy consuming industries such as the cement industries. The objective of this research is therefore to conduct energy auditing in Messobo Cement Factory to quantify the energy losses in the system and to identify potential areas for improvement. On site measurements of the material and energy flows was conducted using Infrared thermometer, Thermocouples and Pitot static probe with manometer. Based on the energy analysis performed, the most energy intensive process is found to be the pyre system (burning). The specific heat consumption has been found to be 844.5 kcal/kg-cl with around 45.83 % system efficiency. The major heat losses for the processes occurred in pre - heater exhaust gases and grate cooler vent air that accounted as 176.7 kcal /kg-cl and 199.3 kcal/kg-cl respectively. Comparison of the specific heat consumption with the standard specific heat consumption of the technology under study (730-780 kcal/kg-cl) showed about 64.5 kcal/kg-cl more energy consumption in the kiln system. This indicates that there is a need to improve the energy consumption by applying proper energy saving techniques.Keywords: Rotary Kiln; Heat balance; Auditing; Efficiency
{"title":"Energy consumption and saving potential in cement factory: thermal energy auditing","authors":"M. Gebreslassie, K. G. Gebrelibanos, S. Belay","doi":"10.4314/STECH.V7I2.9","DOIUrl":"https://doi.org/10.4314/STECH.V7I2.9","url":null,"abstract":"Energy is one of the major inputs for the economic development of any country, thus lack of efficient and effective utilization of energy is a major concern in high-energy consuming industries such as the cement industries. The objective of this research is therefore to conduct energy auditing in Messobo Cement Factory to quantify the energy losses in the system and to identify potential areas for improvement. On site measurements of the material and energy flows was conducted using Infrared thermometer, Thermocouples and Pitot static probe with manometer. Based on the energy analysis performed, the most energy intensive process is found to be the pyre system (burning). The specific heat consumption has been found to be 844.5 kcal/kg-cl with around 45.83 % system efficiency. The major heat losses for the processes occurred in pre - heater exhaust gases and grate cooler vent air that accounted as 176.7 kcal /kg-cl and 199.3 kcal/kg-cl respectively. Comparison of the specific heat consumption with the standard specific heat consumption of the technology under study (730-780 kcal/kg-cl) showed about 64.5 kcal/kg-cl more energy consumption in the kiln system. This indicates that there is a need to improve the energy consumption by applying proper energy saving techniques.Keywords: Rotary Kiln; Heat balance; Auditing; Efficiency","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124476461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mobility and accessibility provided by the transport system have been playing a major role in shaping countries, influencing the location of social and economic activity, the form and size of cities, and the style and pace of life by facilitating trade, permitting access to people and resources, and enabling greater economies of scale, worldwide and throughout history. This study examined the challenges, prospect and opportunities of air transport operation in Nigeria. Data was obtained from the administration of questionnaires to 170 aviation workers at Muritala Muhammed Airport in Lagos, who were randomly selected. Simple descriptive statistics, Chi-Square and Analysis of variance were employed. The findings show that private investment is critical to sustainable air transport infrastructure in Nigeria. Based on available facts and figure, it can be concluded that government should create an enabling environment for the airlines and come up with maintenance, repair and overhaul policy, as well as address the foreign exchange challenge facing airlines in Nigeria.Keywords: Infrastructure, Operation, Enabling Environment, Transport, Aviation
{"title":"An evaluation of the challenges, prospect and opportunities of air transport operation in Nigeria","authors":"Akin Babatunde Adeoye, A. Musa, O. Afolabi","doi":"10.4314/stech.v7i2.8","DOIUrl":"https://doi.org/10.4314/stech.v7i2.8","url":null,"abstract":"Mobility and accessibility provided by the transport system have been playing a major role in shaping countries, influencing the location of social and economic activity, the form and size of cities, and the style and pace of life by facilitating trade, permitting access to people and resources, and enabling greater economies of scale, worldwide and throughout history. This study examined the challenges, prospect and opportunities of air transport operation in Nigeria. Data was obtained from the administration of questionnaires to 170 aviation workers at Muritala Muhammed Airport in Lagos, who were randomly selected. Simple descriptive statistics, Chi-Square and Analysis of variance were employed. The findings show that private investment is critical to sustainable air transport infrastructure in Nigeria. Based on available facts and figure, it can be concluded that government should create an enabling environment for the airlines and come up with maintenance, repair and overhaul policy, as well as address the foreign exchange challenge facing airlines in Nigeria.Keywords: Infrastructure, Operation, Enabling Environment, Transport, Aviation","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131086614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Axiology or Theory of Value is a branch of Philosophy which has in its own way, elicited profound interest and polemic This interest in axiology became quite profound in the 19th and 20th centuries However, Risieri Frondizi makes us to understand that Alexius Von Meinong was not the initiator of this branch of Philosophy as held by some authors. Just like any other branch of Philosophy, axiology is polarized into two dominant Philosophical views, namely: the objectivist view, and the subjectivist view. The objectivists hold the cognition of value to be Independent of both object and subject, as well as having empirical provability. The subjectivist on the other hand, holds value to be dependent on both object and the feelings of the subject concerned. This work attempted a detailed exposition of Max Scheler’s axiology. Scheler, it should be noted, is an objectivist; he is of Husserl’s phenomenological persuasion or tradition. Scheler’s input in axiology is epitomized in his Emotional Intuitionism postulation. This work then, featured an analysed critique of Scheler’s position, based on his views as put forward by R. Frondizi in his book What is value: An introduction to axiology.Keywords: emotional institutionalism, axiology, theory of value, phenomenological disposition
{"title":"A critique of Scheler’s emotional intuitionism","authors":"Tamunosiki V. Ogan","doi":"10.4314/stech.v7i2.10","DOIUrl":"https://doi.org/10.4314/stech.v7i2.10","url":null,"abstract":"Axiology or Theory of Value is a branch of Philosophy which has in its own way, elicited profound interest and polemic This interest in axiology became quite profound in the 19th and 20th centuries However, Risieri Frondizi makes us to understand that Alexius Von Meinong was not the initiator of this branch of Philosophy as held by some authors. Just like any other branch of Philosophy, axiology is polarized into two dominant Philosophical views, namely: the objectivist view, and the subjectivist view. The objectivists hold the cognition of value to be Independent of both object and subject, as well as having empirical provability. The subjectivist on the other hand, holds value to be dependent on both object and the feelings of the subject concerned. This work attempted a detailed exposition of Max Scheler’s axiology. Scheler, it should be noted, is an objectivist; he is of Husserl’s phenomenological persuasion or tradition. Scheler’s input in axiology is epitomized in his Emotional Intuitionism postulation. This work then, featured an analysed critique of Scheler’s position, based on his views as put forward by R. Frondizi in his book What is value: An introduction to axiology.Keywords: emotional institutionalism, axiology, theory of value, phenomenological disposition","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128724163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stock Market prediction has been one of the active research areas that have enjoyed attention in the fields of actuarial science and quantitative finance. This article investigates the Markovian characteristics of the Nigeria Stock Market using weekly data on All Share Index (ASI) market, 30- Index and five sub-sectors of Nigerian stock exchange from October 4, 2013 to September 30, 2016. The Chapman-Kolmogorov’s principles of handling transition probabilities and limiting distributions methods were employed for predicting future market behaviour. The findings suggest that compounded returns of the indices for the sectors and the market are highly volatile. The long-run distribution forecasts established that the market converged to stationarity after six weeks, while industrial sector has the shortest stationarity step period of five weeks. It is also observed that it will take about 31 weeks for the market and the 30-Index to reach the best return state, while about 78 weeks period is required to revert to the worst performing state. Further analysis findings of the mean return time suggest that it will take only about two weeks period for the indices returns of the market and the sectors under study to transit to the average state irrespective of the current state. Generally, the findings established the volatile nature of the market and its rapid tendency for deterioration. Finally, it is important to note that the 30-Index and ASI exhibit similar Markovian characteristics. It is pertinent to ensure strict compliance of the 30-Index stocks to the regulatory risk management frameworks for the robustness and sustainability of the market.Keywords: Markov Process, Nigeria Stock Market, All Share Index, limiting distribution, Mean return and First Passage time, Prediction
{"title":"Macorvian characteristics of the Nigerian stock market","authors":"H. Dallah, Ismaili I. Adeleke","doi":"10.4314/STECH.V7I2.7","DOIUrl":"https://doi.org/10.4314/STECH.V7I2.7","url":null,"abstract":"Stock Market prediction has been one of the active research areas that have enjoyed attention in the fields of actuarial science and quantitative finance. This article investigates the Markovian characteristics of the Nigeria Stock Market using weekly data on All Share Index (ASI) market, 30- Index and five sub-sectors of Nigerian stock exchange from October 4, 2013 to September 30, 2016. The Chapman-Kolmogorov’s principles of handling transition probabilities and limiting distributions methods were employed for predicting future market behaviour. The findings suggest that compounded returns of the indices for the sectors and the market are highly volatile. The long-run distribution forecasts established that the market converged to stationarity after six weeks, while industrial sector has the shortest stationarity step period of five weeks. It is also observed that it will take about 31 weeks for the market and the 30-Index to reach the best return state, while about 78 weeks period is required to revert to the worst performing state. Further analysis findings of the mean return time suggest that it will take only about two weeks period for the indices returns of the market and the sectors under study to transit to the average state irrespective of the current state. Generally, the findings established the volatile nature of the market and its rapid tendency for deterioration. Finally, it is important to note that the 30-Index and ASI exhibit similar Markovian characteristics. It is pertinent to ensure strict compliance of the 30-Index stocks to the regulatory risk management frameworks for the robustness and sustainability of the market.Keywords: Markov Process, Nigeria Stock Market, All Share Index, limiting distribution, Mean return and First Passage time, Prediction","PeriodicalId":272760,"journal":{"name":"AFRREV STECH: An International Journal of Science and Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123193370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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