This paper investigated the relationship between rainfall and losses in revenue incurred by owners of buildings and property , in fire domestic and industrial insurance classes, during the years 1997 - 2000 and the ensuing claims that insurance companies in Nairobi had to pay. A rainfall derivative was then formulated. The methodologies included correlation, regression analysis, and questionnaire analysis. Results showed that extreme weather events, particularly excessive rainfall, had a direct impact on the extent of damage on buildings and property. It also became clear that insurance companies did not necessarily consult the meteorologists when underwriting policies and furthermore did not particularly consider that the meteorological information and products issued were relevant or accurate. This information will form the basis for a broader, more detailed study within the interdisciplinary field of Actuarial Science and Meteorology in Kenya, and will aim at creating useful and accurate weather derivatives that can be traded.
{"title":"THE INFLUENCE OF WEATHER ON THE INSURANCE INDUSTRY IN NAIROBI","authors":"A. M. Ocholla, N. J. Muthama, J. Owino","doi":"10.4314/AJST.V7I1.55206","DOIUrl":"https://doi.org/10.4314/AJST.V7I1.55206","url":null,"abstract":"This paper investigated the relationship between rainfall and losses in revenue incurred by owners of buildings and property , in fire domestic and industrial insurance classes, during the years 1997 - 2000 and the ensuing claims that insurance companies in Nairobi had to pay. A rainfall derivative was then formulated. The methodologies included correlation, regression analysis, and questionnaire analysis. Results showed that extreme weather events, particularly excessive rainfall, had a direct impact on the extent of damage on buildings and property. It also became clear that insurance companies did not necessarily consult the meteorologists when underwriting policies and furthermore did not particularly consider that the meteorological information and products issued were relevant or accurate. This information will form the basis for a broader, more detailed study within the interdisciplinary field of Actuarial Science and Meteorology in Kenya, and will aim at creating useful and accurate weather derivatives that can be traded.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86018686","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}
E. Omwenga, T. Waema, G. Eisendrath, Arno Libotton
The paper discusses a stratified objectives-driven e-content structuring and deployment framework which is an iterative and intuitive approach to content structuring and sequencing. The model has been developed from experiences and insights gained over a four-stage content development training process involving university lecturers in liberal arts, sciences and engineering subjects. The model supports a hierarchical approach in knowledge presentation starting from the most abstract to the most specific. It is a layered structure of entities whose naming conforms to content abstractions. In this paper, we argue that the concept of Objectives is an effective tool that enables logical content breaking-up and sequencing. We demonstrate that objectives help one to think critically on what to include under specific topics. The findings indicate that objectives play a central role in providing an effective content validation mechanism. Further, collaborative efforts among homogenous groups result in the most efficient approach on training in content development.
{"title":"A structured e-content development framework using a stratified objectives-driven methodology","authors":"E. Omwenga, T. Waema, G. Eisendrath, Arno Libotton","doi":"10.4314/AJST.V6I1.55168","DOIUrl":"https://doi.org/10.4314/AJST.V6I1.55168","url":null,"abstract":"The paper discusses a stratified objectives-driven e-content structuring and deployment framework which is an iterative and intuitive approach to content structuring and sequencing. The model has been developed from experiences and insights gained over a four-stage content development training process involving university lecturers in liberal arts, sciences and engineering subjects. The model supports a hierarchical approach in knowledge presentation starting from the most abstract to the most specific. It is a layered structure of entities whose naming conforms to content abstractions. In this paper, we argue that the concept of Objectives is an effective tool that enables logical content breaking-up and sequencing. We demonstrate that objectives help one to think critically on what to include under specific topics. The findings indicate that objectives play a central role in providing an effective content validation mechanism. Further, collaborative efforts among homogenous groups result in the most efficient approach on training in content development.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84633059","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 assesses the soil conditioning capacity of tree gums based on the level of resistance to crumble posed by moulds of treated soils to the impacts of artificial raindrops. Gums exuded by trees viz., Acacia occidental and Parkia bicolor as well as a sample of poly(vinyl) alcohol (PVA) were used as soil conditioners. The soil samples were a loam, laterite and a leached sandy soil, labeled A, B and C, respectively. The study shows that compared to PVA (an established synthetic soil conditioner), treatments by the tree gums conferred greater conditioning capacity to the soil samples; the conditioning effectiveness of the tree gums was in the order P. bicolor>A. occidentale>PVA. The effectiveness of the all the conditioners increased with concentration with a somewhat leveling effect at high concentrations. An appreciable degree of stability to the raindrops (96.6, 111 and 114 % for samples B, A and C, respectively) was imparted to the soil samples when they were treated with 1% (w/v) CaCl2 solution on its own; prior treatment of the soil samples with the CaCl2 solution enhanced the soil conditioning properties of the tree gums as well as the PVA. The soil conditioning effect was most pronounced in the case of sample B (the lateritic soil) and least pronounced in the case of sample C (the leached sandy soil). These results are interpreted in terms of the physico-chemical properties of the conditioners and of the soil samples.
{"title":"An assessment of the soil-conditioning capacity of gums exuded by some trees in Sierra Leone ii: raindrop experiments","authors":"T. Yormah, P. O. Egbenda","doi":"10.4314/AJST.V6I1.55171","DOIUrl":"https://doi.org/10.4314/AJST.V6I1.55171","url":null,"abstract":"This study assesses the soil conditioning capacity of tree gums based on the level of resistance to crumble posed by moulds of treated soils to the impacts of artificial raindrops. Gums exuded by trees viz., Acacia occidental and Parkia bicolor as well as a sample of poly(vinyl) alcohol (PVA) were used as soil conditioners. The soil samples were a loam, laterite and a leached sandy soil, labeled A, B and C, respectively. The study shows that compared to PVA (an established synthetic soil conditioner), treatments by the tree gums conferred greater conditioning capacity to the soil samples; the conditioning effectiveness of the tree gums was in the order P. bicolor>A. occidentale>PVA. The effectiveness of the all the conditioners increased with concentration with a somewhat leveling effect at high concentrations. An appreciable degree of stability to the raindrops (96.6, 111 and 114 % for samples B, A and C, respectively) was imparted to the soil samples when they were treated with 1% (w/v) CaCl2 solution on its own; prior treatment of the soil samples with the CaCl2 solution enhanced the soil conditioning properties of the tree gums as well as the PVA. The soil conditioning effect was most pronounced in the case of sample B (the lateritic soil) and least pronounced in the case of sample C (the leached sandy soil). These results are interpreted in terms of the physico-chemical properties of the conditioners and of the soil samples.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"121 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87751700","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}
In this paper we describe and implement an algorithm for the exact solution of the Linear Ordering problem. Linear Ordering is the problem of finding a linear order of the nodes of a graph such that the sum of the weights which are consistent with this order is as large as possible. It is an NP - Hard combinatorial optimisation problem with a large number of applications, including triangulation of input - output matrices in Economics, aggregation of individual preferences and ordering of teams in sports. We implement an algorithm for the exact solution using cutting plane and branch and bound procedures. The program developed is then applied to the triangulation problem for the input - output tables. We have been able to triangulate input - output matrices of size up to 41 x 41.
本文描述并实现了线性排序问题精确解的一种算法。线性排序是寻找图中节点的线性顺序的问题，使得与该顺序一致的权重之和尽可能大。它是一个具有大量应用的NP - Hard组合优化问题，包括经济学中输入-输出矩阵的三角化，个人偏好的聚合和体育运动中的团队排序。我们使用切平面和分支定界法实现了精确解的算法。然后将所开发的程序应用于输入-输出表的三角剖分问题。我们已经能够三角化大小为41 x 41的输入-输出矩阵。
{"title":"The linear ordering problem: an algorithm for the optimal solution","authors":"A. Mushi","doi":"10.4314/AJST.V6I1.55167","DOIUrl":"https://doi.org/10.4314/AJST.V6I1.55167","url":null,"abstract":"In this paper we describe and implement an algorithm for the exact solution of the Linear Ordering problem. Linear Ordering is the problem of finding a linear order of the nodes of a graph such that the sum of the weights which are consistent with this order is as large as possible. It is an NP - Hard combinatorial optimisation problem with a large number of applications, including triangulation of input - output matrices in Economics, aggregation of individual preferences and ordering of teams in sports. We implement an algorithm for the exact solution using cutting plane and branch and bound procedures. The program developed is then applied to the triangulation problem for the input - output tables. We have been able to triangulate input - output matrices of size up to 41 x 41.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85651684","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}
J. K. Mulwa, S. J. Gaciri, J. Barongo, N. Opiyo-Akech, G. Kianji
Groundwater is increasingly becoming an important resource within and around the Ngong area, of Kenya. This is mainly as a result of increase in human population due to rural-urban migration, industrial expansion and farming activities. Ngong area forms a water catchment zone to the west of the city of Nairobi in Kenya. The geology of the area is comprised of volcanic layers of basalts, trachytes, phonolites and tuffs all overlain by thick layers of clay soil. The soil retains water for an extended period of time after the rains and this partly recharges aquifers in the area. Basalts and trachytes form good aquifers whereas tuffs are aquifers only when fractured. Faults delineated from a study of aerial photographs trend in a North-South direction in conformity with the structural pattern of the eastern branch of the Great Rift Valley. The influence of the faults on groundwater is two fold. They act as drainage channels to the flow of groundwater and also as aquifers in the area.
{"title":"Geological and structural influence on groundwater distribution and flow in Ngong area, Kenya","authors":"J. K. Mulwa, S. J. Gaciri, J. Barongo, N. Opiyo-Akech, G. Kianji","doi":"10.4314/AJST.V6I1.55166","DOIUrl":"https://doi.org/10.4314/AJST.V6I1.55166","url":null,"abstract":"Groundwater is increasingly becoming an important resource within and around the Ngong area, of Kenya. This is mainly as a result of increase in human population due to rural-urban migration, industrial expansion and farming activities. Ngong area forms a water catchment zone to the west of the city of Nairobi in Kenya. The geology of the area is comprised of volcanic layers of basalts, trachytes, phonolites and tuffs all overlain by thick layers of clay soil. The soil retains water for an extended period of time after the rains and this partly recharges aquifers in the area. Basalts and trachytes form good aquifers whereas tuffs are aquifers only when fractured. Faults delineated from a study of aerial photographs trend in a North-South direction in conformity with the structural pattern of the eastern branch of the Great Rift Valley. The influence of the faults on groundwater is two fold. They act as drainage channels to the flow of groundwater and also as aquifers in the area.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81029161","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}
Text-to-speech (TTS) applications have been applied in diverse areas all over the world. Considering the fact that Swahili pronunciation is not complicated, and the language spoken by about 45 – 100 million people as their first or second language,, we considered the feasibility, and developed a Swahili Text-to-Speech (TTS) system. This paper gives an account of the Swahili TTS system developed. It discusses the analysis, design, achievements, points out some fundamental issues encountered in its development, and suggestions for extensions to achieve a complete Swahili TTS system.
{"title":"Swahili text-to-speech system","authors":"K. Ngugi, W. Okelo-Odongo, P. Wagacha","doi":"10.4314/AJST.V6I1.55170","DOIUrl":"https://doi.org/10.4314/AJST.V6I1.55170","url":null,"abstract":"Text-to-speech (TTS) applications have been applied in diverse areas all over the world. Considering the fact that Swahili pronunciation is not complicated, and the language spoken by about 45 – 100 million people as their first or second language,, we considered the feasibility, and developed a Swahili Text-to-Speech (TTS) system. This paper gives an account of the Swahili TTS system developed. It discusses the analysis, design, achievements, points out some fundamental issues encountered in its development, and suggestions for extensions to achieve a complete Swahili TTS system.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81249789","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}
The van der Waal equation of state is redefined in a functional manner that reveals some additional critical parameters and presents the ideal gas temperature as a lower limit to the van der Waal gas temperature. The law of corresponding states is also shown to apply to the lower limits of reduced temperatures.
{"title":"Analysis of van der waal equation near the critical point","authors":"J. B. Awuor","doi":"10.4314/AJST.V6I1.55159","DOIUrl":"https://doi.org/10.4314/AJST.V6I1.55159","url":null,"abstract":"The van der Waal equation of state is redefined in a functional manner that reveals some additional critical parameters and presents the ideal gas temperature as a lower limit to the van der Waal gas temperature. The law of corresponding states is also shown to apply to the lower limits of reduced temperatures.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81685972","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}
Une campagne de prospection electrique de type Schlumberger a ete realisee sur une zone couvrant une surface 50 Ha dans une bassin phosphatier. Un nouveau procede base sur l’optimisation des reponses du signal analytique des donnees de resistivite a ete realise afin de circonscrire les zones anomales de « perturbations » des series phosphatees. Des modeles de terrain 3D ont ete obtenus le long d’une profondeur de 30 m. Ces procedes ont permis de caracteriser spatialement les anomalies geoelectriques tout en amoindrissant leurs caracteres aleatoires. Les estimations de calcul des reserves se trouvent fortement circonscrites.
{"title":"Un modèle 3d des “perturbations” des séries phosphatées basé sur l’optimisation des réponses du signal analytique des données de résistivité électrique","authors":"S. Bakkali, M. Amrani","doi":"10.4314/AJST.V7I1.55208","DOIUrl":"https://doi.org/10.4314/AJST.V7I1.55208","url":null,"abstract":"Une campagne de prospection electrique de type Schlumberger a ete realisee sur une zone couvrant une surface 50 Ha dans une bassin phosphatier. Un nouveau procede base sur l’optimisation des reponses du signal analytique des donnees de resistivite a ete realise afin de circonscrire les zones anomales de « perturbations » des series phosphatees. Des modeles de terrain 3D ont ete obtenus le long d’une profondeur de 30 m. Ces procedes ont permis de caracteriser spatialement les anomalies geoelectriques tout en amoindrissant leurs caracteres aleatoires. Les estimations de calcul des reserves se trouvent fortement circonscrites.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81764126","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}
TThe paper introduces the concepts of covariance differences of a sequence and establishes its relationship with the covariance function. One of the main results of this paper is the criteria of linear representability of sequences in Hilbert spaces.
{"title":"Covariance differences of linealy representable sequences in Hilbert spaces","authors":"J. Muriuki","doi":"10.4314/AJST.V7I1.55189","DOIUrl":"https://doi.org/10.4314/AJST.V7I1.55189","url":null,"abstract":"TThe paper introduces the concepts of covariance differences of a sequence and establishes its relationship with the covariance function. One of the main results of this paper is the criteria of linear representability of sequences in Hilbert spaces.","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86782942","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}
P. Chibwe, S. Simukanga, L. Witika, P. Chisanga, M. Powell
The primary objective in any ore processing method, is to prepare the ore for economical and effective extraction the valuable minerals. Milling circuits are extremely energy intensive, making them very expensive operations and it is very pertinent to optimise their operation to be economically viable. Therefore, their design is very critical and this can only be achieve by adopting new control strategies to improve energy utilisation. Nkana Mine concentrator of the Zambia Consolidated Copper Mines Limited (ZCCM) has been experiencing problems in establishing the optimum mesh of grind for the various ores, to achieve effective separation of the cobalt minerals from those of copper. This prompted the designing and testing of representative samplers for sampling the milling circuit at Nkana Concentrator. In the design of the samplers, use was made of the Gy’s formula to determine the minimum weight of the sample to be extracted from various process streams. The particle size distribution of the streams was conducted to determine the size of the largest particle in each stream. Samplers were designed on the basis of theoretical and practical applications and a factor of three was built in the normal sampler width opening. This enabled that the entire stream had equal chance of entering the sampler.The milling circuit on which a sampling campaign was conducted consisted of a 2.7m by 3.6m (9ft, 12ft) Rod Mill in open circuit with a 760mm (30inch) hydrocyclone which was in closed circuit with a Ball Mill of the same dimension as the Rod Mill. Samples were taken from the feed to the Rod Mill, Rod Mill discharge, Cyclone underflow( feed to the Ball Mill), Ball Mill discharge and the cyclone overflow using appropriate sampling techniques for a complete shift at equally spaced intervals. Sampling was only started when it was established that steady state operation of the plant was attained. Important operating parameters were established which included the throughput of the material to the Rod Mill, the pulp densities of the streams in the milling circuit, the particle size distribution of the streams, volumetric flow rates of the streams and the rate at which dilution water was added. These parameters were then used to carry out Mass balancing using a mineral processing simulation software called JKSimMet which has been developed by the Julius Kruttschnitt Mineral Research Centre at the University of Queensland in Australia. The simulator can be used to predict the possible alternatives to optimising the circuit performance and physical modifications which can be made to the plant with confidence. The correlation between the measured and the calculated parameters was found to be fairly satisfactorily. This showed that the designed samplers and the sampling techniques used were suitable for obtaining representative samples from the milling circuit. This paper describes the method used in designing the samplers, the sampling techniques used and the results
{"title":"Designing and testing the representative samplers for sampling a milling circuit at Nkana copper/cobalt concentrator","authors":"P. Chibwe, S. Simukanga, L. Witika, P. Chisanga, M. Powell","doi":"10.4314/AJST.V6I2.55179","DOIUrl":"https://doi.org/10.4314/AJST.V6I2.55179","url":null,"abstract":"The primary objective in any ore processing method, is to prepare the ore for economical and effective extraction the valuable minerals. Milling circuits are extremely energy intensive, making them very expensive operations and it is very pertinent to optimise their operation to be economically viable. Therefore, their design is very critical and this can only be achieve by adopting new control strategies to improve energy utilisation. Nkana Mine concentrator of the Zambia Consolidated Copper Mines Limited (ZCCM) has been experiencing problems in establishing the optimum mesh of grind for the various ores, to achieve effective separation of the cobalt minerals from those of copper. This prompted the designing and testing of representative samplers for sampling the milling circuit at Nkana Concentrator. In the design of the samplers, use was made of the Gy’s formula to determine the minimum weight of the sample to be extracted from various process streams. The particle size distribution of the streams was conducted to determine the size of the largest particle in each stream. Samplers were designed on the basis of theoretical and practical applications and a factor of three was built in the normal sampler width opening. This enabled that the entire stream had equal chance of entering the sampler.The milling circuit on which a sampling campaign was conducted consisted of a 2.7m by 3.6m (9ft, 12ft) Rod Mill in open circuit with a 760mm (30inch) hydrocyclone which was in closed circuit with a Ball Mill of the same dimension as the Rod Mill. Samples were taken from the feed to the Rod Mill, Rod Mill discharge, Cyclone underflow( feed to the Ball Mill), Ball Mill discharge and the cyclone overflow using appropriate sampling techniques for a complete shift at equally spaced intervals. Sampling was only started when it was established that steady state operation of the plant was attained. Important operating parameters were established which included the throughput of the material to the Rod Mill, the pulp densities of the streams in the milling circuit, the particle size distribution of the streams, volumetric flow rates of the streams and the rate at which dilution water was added. These parameters were then used to carry out Mass balancing using a mineral processing simulation software called JKSimMet which has been developed by the Julius Kruttschnitt Mineral Research Centre at the University of Queensland in Australia. The simulator can be used to predict the possible alternatives to optimising the circuit performance and physical modifications which can be made to the plant with confidence. The correlation between the measured and the calculated parameters was found to be fairly satisfactorily. This showed that the designed samplers and the sampling techniques used were suitable for obtaining representative samples from the milling circuit. This paper describes the method used in designing the samplers, the sampling techniques used and the results ","PeriodicalId":7641,"journal":{"name":"African Journal of Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2010-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88312457","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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