Volume 6, Issue 6

DESIGN AND CONSTRUCTION OF REMOTE CONTROL AUTOMATIC MAINS FAILURE (AMF) SWITCH []


The need for continuous power supply and its reliability has increased rapidly over the years as most human activities solely depend on electricity, especially in some areas where uninterrupted power supply is a must. Interruption of power supply has adverse effects on the consumers of the electricity and consequently their equipment are liable to damage, with operations and processes halted as commonly noticed in developing countries like Nigeria. In this paper, a remote control automatic mains failure switch is designed and constructed for a 3-phase, 4-wire electrical/electronic equipment. It provides a switching mechanism that transfers the consumer loads from utility supply to a power source from a generator in the event of power failure in the utility/public mains supply. Phase detectors were used to monitor the lines of the mains supply and a relay based system was used to actualize the control actions. The remote control unit integrated into the system ensures savings of an average of 12% unnecessary expense monthly from non-critical use of generator as it allows the generator to be switched on remotely when occasioned with the absence of any or all of the phases in the public mains supply. In addition to this, it ensures continuous supply to the loads with operators having the ability to exert control the supply system at any time from a distance of 100 meters.


FIGHTING SOCIAL TERRORISM THROUGH CYBER SECURITY []


Terrorism is a major problem of the world today. Terrorism has affected government policies, inflicted injuries on men and women and caused physical damages to both people and infrastructure across the world. Computer, networks, electronic and other resources are usually the prime targets of suchterrorist attacks. This paper highlights existing cyber threats, discover efficient techniques for handling them and spread the awareness of such discovered information. A detailed study of information from secondary sources which includes the rich content of the internet and physical libraries were used to reveal that terrorist groups take advantage of certain anonymity provided by the internet especially through the social media platforms to perpetrate their evil intentions. The revelation arms individuals, organizations and government agencies with the strategy to adequately prepare to address all their security deficiencies while on the internet and thereby enhances their, safety, productivity and overall preformance both in business, government and family life.


THE CONTRIBUTION OF FISHERIES SECTOR IN RE-GIONAL DEVELOPMENT OF BOGOR REGENCY WEST JAVA PROVINCE []


The purpose of this research is to analyze the growth of fisheries sector, the strength of the commodities market and the strength of the fishery sector base and non-fishery base in the regional development of Bogor regency. The writer uses quantitative research method to answer the problem formulation and is using secondary data that is cross section and time series which further analyzed using descriptive statistics. The data analysis covers the analysis of Growth Indices, Trade Area Capture (TAC) and the Pull Factor (PF) analysis and Minimum Requirement Approach (MRA) analysis. The results of the Growth Indices analysis show the GRDP growth of the fisheries sector in Bogor regency increased 65% within two years. The average results of the TAC analysis in 2014 - 2016 demonstrating the value of TAC is greater than the total population (5.785.671 > 5.459.402) so it can be inferred that Bogor regency is able to capturing trade opportunities of other regional fishery products and Bogor regency society has a pattern of expenditure against fishery products that are larger than the province of West Java. While the average results of PF analysis shows the value of PF amounted to 1,06 so it can be inferred that Bogor regency is able to attract customers from other regions and has specialized in terms of fishery products market. The results of the MRA analysis in Bogor regency earned a base multiplier of 6.395,8 which mean each 6.395 of the labor created by sector base will produce 0,8 the labor in sector non base. Or for every 6.395 of the labor in sector base is expected will be created 8 labor in the sector non base.


ATTENTION DETECTION OF THE DRIVER TO ENSURE SAFE DRIVING []


In this paper, we have tried to detect the focus of attention of the driver from his/her head movement and orientation of pupil detection. If the driver changes his/her gaze, the corresponding coordinate of pupil also changes. The frontal view of the person is divided into three regions corresponding to three target objects and the gaze directions are detected based on in which region the coordinate of pupil is located in the eye area. In our technique we have used a camera to capture video frames of the target person. The frames are converted into grey image and processed pixel by pixel. A 3D head tracker is used to extract the facial regions from the image. From the facial regions face points and eye regions are detected. Using a Vector Field of Image Gradient (VFIG), the pupil of eye is detected. In our ap-proach, we have used the face points to create a rectangle outside of the eyes to detect the gaze of driver by applying different techniques under different lighting conditions and different distances from the camera. For non-frontal face, sometimes situation arises when we cannot detect the pupils efficiently. In this case, we have used the head orientation for gaze detection. The head rectangle has been divided into three regions. We estimate the gaze based on which region the middle of the head falls with varying head rotation time. To ensure a safe driving we need to detect sustained as well as transient attention very carefully and efficiently. To detect the body movement, we have used the optical flow feature and verified this approach in controlled environment. Our result in controlled and real time experiments reveal that, we can efficiently track the focus of attention of the driver from the coordinate of the pupil of the eye combining with head position and consequently we can detect the sustained attention together with transients very effectively and control the attention by deploying an alarming system if inattention is detected.


PERFORMANCE ANALYSIS OF GAS TURBINE POWER PLANT(A CASE STUDY OF DELTA III GT9 TRANSCORP GAS TURBINE POWER PLANT, UGHELLI, NIGERIA) []


This research work is focused on the analysis and performance evaluation of a gas turbine power plant. The gas turbine power plant was evaluated using thermodynamic principles and the technical data of the plant. The data used for the study were obtained from the plant records of Delta III GT9 plant. The results of the analysis for a period of twelve (12) months (January to December, 2016) show that 92% of the expected capacity was available in the period under study. The thermal efficiency of the plant ranged from 26% to 32%, and the plant's capacity factors ranged from 68% to 80%. The reliability of the plant ranged from 21% to 98% (average 58%). For the period under study, only 20 MW of energy (power) was lost out of the expected power of 240 MW. The study revealed that the above performance parameters analyzed for Delta III GT9 plant are within the range of best industrial practice. Also, the efficiencies achieved for the period under study are within the best international value for a single cycle gas turbine plant.


EFFECTIVINESS OF FACTS DEVICES FOR THE CONTROL OF POWER SYSTEM TRANSIENT STABILITY USING DIFFERENT INTELLINGENT TECHNIQUES []


This paper is aimed towards the benefits of utilizing flexible Alternating current transmission system (FACTS) devices using different intelligent techniques with the purpose of improving the operation of an electrical power system. Voltage instability is considered as a main threat to stability, security and reliability in the modern power systems. The application of FACTS controllers has been for the purpose of maximizing the lines conductivity given the restrictions involved, including the issue of stability. The main causes of voltage instability and solutions have been reviewed [29]. Hence, effectiveness of the proposed techniques employed is robust to different operating conditions and disturbances. Performance comparison of different FACTS devices has been discussed. Semiconductor technology development and utility experience have been reviewed and summarized. The used and installation of FACTS devices on the power transmission lines has been discussed. This survey article will be very much useful to the researchers for finding out the relevant references in the field of voltage stability enhancement by using FACTS devices in power transmission system.


Indian Tea Scenario []


World tea production reached 4.73 million tonnes in 2010.At the international level, China, with 28.9 per cent share of the total world tea production, dominates the market.In 2012 world tea production reached 1738.41 m kg. India was the market leader with regard to production and consumption until 2008.At present, India is the second largest producer of tea in the world, and produces around 972.77 million kilograms in 2010-11 as against of 945.27 million kgs in 20092010.Total export of tea from India has estimated at 183.99 million kgs valued at Rs.2274.74 crores with a unit price realization of Rs. 123.64 per Kgs during 2008-2009.As against this 185.32million Kgs valued at Rs, 1888.68 crores with a unit price of Rs. 101.91 per Kgs estimated in 2007-2008.The tea industry accounts for the employment of more than 2 million people in India. India is the largest producer and consumer of black tea in the world.India produces all the three types of tea CTC tea, Orthodox tea, and Green tea, wherein CTC tea accounted for 88% of total output in CY 2010, while orthodox tea comprised 10% and the green tea accounts just 2 percent of the total production.


INVESTIGATION INTO THE USE OF RICE HUSK ASH AND LOCAL DYE RESIDUE (KATSI) AS PARTIAL REPLACEMENT FOR CEMENT []


This paper presents an investigation into the use of rice husk ash and local dye residue (Katsi) as a pozzolanas for partial replacement of cement in concrete production with the view of increasing its compressive strength. The effects of rice husk ash and the mixture of rice husk ash and local dye residue on the properties of fresh concrete which includes workability and density and also water absorption were determined. Compressive strength of the hardened concrete was determined from the rice husk ash and ordinary Portland cement (RHA-OPC) concrete at various percentages of 5%, 10%, 15%, & 20% and then the mixture of RHA, local dye residue and OPC concrete at various percentages of 5%(2.5% each), 10%(5%each), 15%(7.5%each) & 20%(10%each) at curing ages of 7days, 14days, 28days and 90days. The results shows the use of RHA in partial replacement of cement reduces the workability and the density when compared with concrete produced with OPC only, but the mixture of RHA and local dye residue increase the workability above that of RHA-OPC concrete but lower than OPC concrete. The concrete made with the mixture of RHA and local dye residue increases the density of the concrete above that of both RHA-OPC concrete and OPC concrete, because of the higher specific gravity of the local dye residue. Compressive strength test carried out on RHA-OPC concrete revealed a reasonable value at 5% and 10%, with a significant decrease in 15% and 20%. The concrete made with RHA and dye residue shows an increase in compressive strength above that of RHA-OPC concrete. A significant increase in compressive strength was seen at 90 days of curing age with a value 33.62N/mm2 at 5% and a least value of 26.30N/mm2 of RHA and dye residue concrete. Therefore, the result shows that partial replacement of cement using RHA and local dye residue was feasible at 5% to 20% replacement at curing age of 28days and 90days.


Research and Design working characteristics of orthogonal turbine []


For the orthogonal turbine runner, the geometry parameters such as runner diameter, blade height, number of blades, D/H ratio, blade profiles... have certain effects on the ability to working situation and the performance of the turbine. Therefore to give the runner samples with good efficiency and working ability, it need to design, simulate and test many runner samples, hence we can select the most optimal one.This paper simulate the circumstances on changing D/H ratio of the runner samples, specific to the 03 cases that are D/H = 0.9, D/H = 1 and D/H = 1.1 to evaluate turbine working situation, based on we can select the optimum working runner sample.


BASIC REVERSIBLE LOGIC GATES []


Reversible logic has obtained importance in recent times because of the fact that power consumption in these circuits can be drastically reduced. In conventional digital circuits, a significant amount of energy is dissipated as the bits of information are lost during logical operations. This loss of bits of information can be avoided by using reversible logic gates. This paper gives the valuable information of about the reversible logic gates designed and the circuits implemented using the same.


GEOSPATIAL ASSESSMENT OF THE COASTAL REGION OF SOUTHWEST NIGERIA []


Land use/cover change is one of the main driving forces for global climate change, the change from vegetation to urban land causes not only interruptions of carbon and water cycles but also energy fluxes between the land and the atmosphere. The spatial distribution of the LST varies depending on the land cover type. The southwestern coastal region of Nigeria consist of towns experiencing rapid urbanization most especially towns located on Lagos coastal land. The land use land cover change of the region has produced remarkable influences on the land surface temperature. The land surface temperature influences the micro climate and social-economic development on a regional scale. The vegetation health, Land Surface Temperature (LST) and Land Use Land Cover of 1986, 2001 and 2016 were analyzed for the spatial distribution of changes in temperature, vegetation cover and land cover using Landsat images. A quantitative approach was used to explore the relationships among land surface temperature, land cover areas and Normalized Difference Vegetation Index (NDVI). Results showed that the vegetation cover has decreased rapidly over the 30 years' period from 72.45% to 54.00% and built-ups (urban areas) increased from 4.14% to 20.57%; and this changes has contributed to the variations in the microclimate and affected the land surface temperature. Furthermore, the NDVI correlated negatively with high land surface temperatures for the considered study years with 2001 showing the strongest negative correlation.


CLIMATE CHANGE IMPACT ON RAINFALL AND TEMPERATURE DISTRIBUTIONS OVER WEST AFRICA FROM THREE IPCC SCENARIOS []


The study investigates the climate change impact on monthly and seasonal distribution of rainfall and temperature of three scenarios of the Intergovernmental Panel on Climate Change (IPCC) between year 2000 and 2099. The analysis considered two climatic periods which are 2000 to 2029 as present and 2070 to 2099 as future. The ten year mean (decadal) analyses of these two parameters were also performed. The result showed that temperature increases over West Africa countries in all the months under each of the scenarios. Scenario A2 with the highest emission of 800ppm shows the highest increase of temperature and rainfall over West Africa followed by scenario A1B with emission of 720ppm and the least is that of B1 with the lowest emission of 550ppm. The result also showed that rainfall increases over most part of West Africa in all the scenarios with the exception of coastline that a little decrease in amount of rainfall was estimated. However, the decadal analysis shows that there is a gradual and almost consistent increase in temperature and rainfall over West Africa. Monthly mean values of scenario B1 estimated higher in all the months than its scenario A1B counterpart while those of A1B are also higher than those of scenario B1. The result implies that the higher the emission, the higher is the temperature which leads to warmer future and most likely the more rainfall and hence likelihood of flooding, more occurrence of heat wave and other high temperature related problems. It therefore recommended that IPCC regulation to reduce emission should be strictly adhered to by all countries so that the world can have a better future to dwell in.


PHYSIOLOGICAL RESPONSE AND SURVIVAL RATE OF RED TILAPIA (OREOCHROMIS SP.) AT DIFFERENT LEVELS OF SALINITY []


This study aims to determine the effect of different salinity levels on the physiology response of Red tilapia (Oreochoromis sp.) determined from survival rate, overculum motion, motion activity, and mucus production. The test animals used in this study were Red tilapia seeds with weights ranging from 1-3 grams acclimatized for 5 days in aquarium media measuring 60x40x40 cm. The method used in this study was Experimental with Completely Randomized Design consisting of 10 salinity treatments (0, 2, 4, 6, 8,10, 12, 14, 16, 18) with 3 replications. Observation of operculum motion is done by observing open operculum cap / minute, identification of motion activity seen from fish movement and fish shock power. While the observation of mucus production is done by looking at the mucus derived from the fish body. The results showed that the average of Red tilapia fish operculum motion ranged between 102,43-138,33 / minute, the activity of Red tilapia seed motif was active and producing enough mucus. The survival of Red tilapia seeds at 0-16 ppt salinity ranges between 97 -100%, and decreased at 18 ppt salinity of 93.67%. Based on the results of statistical analysis shows that there is a significant difference in each treatment of the survival of Red tilapia seeds.


MINIMIZATION OF THE MAKE-SPAN USING DYNAMIC PROGRAMMING APPROACH IN A MOUKA FOAM COMPANY []


Generally in competitive markets the significance of good scheduling strategies in manufacturing companies is mainly central on the need of developing efficient methods to solving complex scheduling problems. In this present work, we investigated the minimization of the make-span using dynamic programming approach in a Mouka Foam Company. The setup times are one of the most common complications in scheduling problems, and are usually associated with cleaning operations and changing tools and shapes in machines. In this research work, the flow shop problem with make span criterion that was used is n/m/F/cmax (n-job, m-machine), with make span criterion that can be defined as completion time at which all jobs complete processing or equivalently as maximum completion time of jobs. The results obtained reveal that the optimal sequence is job1-job2-job4-job6-job5-job3. In conclusion, the research work showed that the total elapsed time or make-span is 8657.5mins.


COP ANALYSIS OF A VAPOUR ABSORPTION REFRIGERATION CYCLE POWERED BY A SOLAR SYSTEM []


The effectiveness of a vapour absorption refrigeration system which utilizes a binary mixture of ammonia and water, and sourced its power supply from solar energy was analyzed in this paper. Four different cases were considered, namely different evaporating temperatures (267K≤T_e≤283K) but fixed generator and absorber temperatures; different absorber temperatures (303K≤T_a≤313K) but fixed generator and evaporator temperatures; different generator temperatures (343K≤T_g≤388K) but fixed evaporator and absorber temperatures; and different generator temperatures (343K≤T_g≤388K), fixed evaporator temperature but different absorber temperatures.



EMPIRICAL CHARACTERIZATION AND MODELING OF FADE DEPTH DUE TO MULTIPATH PROPAGATION AT MICROWAVE BAND []


In communication system, signal propagates from the base station to the receiver as multitude of partial waves from different directions known as multipath propagation. This effect gives rise to fading of radio signal as the received signal strength decreases. In this work, fade depth, at microwave band signals is estimated and modeled based on the effect of secondary radio parameters such as geoclimatic factor, tropospheric radio reflectivity and refractivity gradient in the year 2017 in Ibadan, south western, Nigeria. The secondary radio parameters were obtained from temperature, relative humidity and atmospheric pressure. The values of point refractivity gradient obtained were used to figure out the geoclimatic factor, K. The results obtained shows monthly and seasonal radio refractivity gradient and geoclimatic factor K and the results affirmed that the geoclimatic factor K is region based. The percentage of time at a given fade depth is exceeded as a single frequency increases rapidly with increasing path length. Based on the geoclimatic factor obtained, the work proposes a general model power1 multipath fading adapted to a link distance at fixed frequency 12.5 GHz and multipath fading model as a function of frequencies at a fixed link distance.


RIP CURRENT AT PANGANDARAN AND PALABUHAN RATU []


This research aims to know the causes, types, and mechanisms of the rip current at Pangandaran and Palabuhanratu. The methods used in this research are image data analysis, visual observation, and field observations in June and September 2015. The image data obtained from Google Earth, visual observation with the aid of a video camera and field observations with measurements of oceanographic parameters of a wave, bathymetry, currents, and staining using dye balls. The results showed the length and width of rip currents at Pangandaran around 300 meters and 90 meters, while in Palabuhanratu which ranges from 150 meters and 40 meters. Wave velocity (C) is 1.47 m/s and 1.51 m/s in Pangandaran, 1.13 m/s and 1.04 m/s in Palabuhanratu. The significant wave height (Hs) in Pangandaran is 1.42; while in Palabuhanratu is 1.58 meters. Bathymetry near the beach in both locations showed a morphological appearance of the beach cup with water depth is 0-7 meters in the break zone. Based on the characteristics of the constituent factors, the type of rip currents at Pangandaran and Palabuhanratu is Accretionary beach rip and Topographic rip. Rip current formation process begins with the coming wave passing through surf zone then deflected by the longshore current and returned to the sea away from the shore. Rip currents at Pangandaran and Palabuhanratu formed daily and last throughout the year.


CONSUMERS’ ONLINE PURCHASE INTENTION IN TEXTILE PRODUCTS []


In present marketing, the Textile Industry has able lots of modifications. These modifications have affected both industries and scope of competition. Therefore it is not surprising that these providers have been enforced in challenging circumstances to focus on their custom-ers’ convenience. Consequently the purpose of this study is to evaluate the Consumers’ Online Purchase Intention in Textile Products. To accomplish the aim of this research, the data were collected from convenience sample of 100 customers. The respondents provided the data by means of a close-ended questionnaire. Pearson’s Correlation was used for testing the hypotheses. Data analysis was conducted using SPSS Software. This study empirically examines the significant relationship between Trust, Perceived risk, Shopping enjoyment and Site design quality as the independent variable and Purchase Intention (PI) as the dependent variable.


An Empirical Study on the Factors Influence on Learning Organizations []


The present highly competitive and vigorous globalized milieu creates continuous challenge of survival and sustainability for all organiza-tions. There is a need for all organizations to learn new things from the environment that will upsurge their competence and capability. This learning progresses an organization towards the concept of learning organization. Paying attention for the Sri Lankan context there is a gap remains in the empirical confirmation on the factors influence the learning organization to that of abroad. This research is carried out with the objective of identify the factors contribute to promote a learning culture in Sri Lankan organization.The research employed a survey design in Ceylon Petroleum Corporation (CPC), deriving a sample of 185 respondents among the executive level employees comprising of 69 “A” grade employees and 116 “B” grade employees, who were selected by using a stratified sampling method. A response rate of 100 per cent was obtained for the analysis.Descriptive statistics and regression analysis were performed to study the factors influence on learning organization. It was found five dimensions, namely innovation, Facilitation, information sharing self-development and empowerment have significant impacts on organizational learning culture in Sri Lanka. The results of the study may be helpful in determining an appropriate environment to stimulate better learning that enables long-term success and increases an organization’s competitive advantage. The findings will also assist managers and government policy makers in fostering learning efforts which leads to superior performance.


WORKING CAPITAL LEVEL AND PROFITABILITY OF MANUFACTURING FIRMS IN UGANDA: A RESEARCH PAPER []


The purpose of this paper is to obtain evidence from different theories like Baumol Theory, Net Trade Cycle Theory, Agency Theory and the Resource – Based Theory and to establish whether working capital level has a relationship with profitability of manufacturing firms in Uganda. The data was analyzed using SPSS (version 20.0), the equation was obtained by both correlation analysis and poled panel data regression models of cross sectional and time series. The orrelation between the log transformed ROA (profitability) and Working Capital Level was weak and non – statistically significant (r = -.077, p >.01). The model of goodness of fit showed a weak and non – statistically significant relationship between Working Capital Level and Profitability, R2 = 006, F = (1, 87) = .523, p > .05. The model of overall significance also revealed that findings were not sufficient to support influence of Working Capital Level on Profitability. The regression coefficient (β) value was -0.000001 and significance level .472 which confirms that relationship is statistically insignificant. Most manufacturing firms in Uganda have a perception that manufacturers need liquid much more than anything else to enhance profitability, probably explaining why some manufacturing firms have not lived long enough to realize their dream. This study confirms that Working Capital Level has no significant effect on profitability. Appropriate levels of working capital can be managed through proper control of cash, accounts receivable and inventory level. In the Ugandan context, manufacturers could use these findings as a guide line and do further research to check on variables that could enhance profitability of manufacturing firms. The study is also one of the few that partly answer questions relating to working capital level and profitability of manufacturing firms in Uganda. The study contributes to literature in that it has taken into account a mediating variable and a moderating variable which variables have not been used in any research known to the researcher and some theories have been brought up in support of the study such as the Baumol Theory, Net Trade Cycle Theory, Agency Theory and Resource – Based theory which involves the ability of business managers to put emphasis on effective management of current assets of the business (Alvarez & Busemitz, 2001).