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  Subjects -> ENGINEERING (Total: 2284 journals)
    - CHEMICAL ENGINEERING (192 journals)
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    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1208 journals)
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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 6)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 226)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 10)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 4)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 6)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 179)
Composites Part B : Engineering     Hybrid Journal   (Followers: 228)
Composites Science and Technology     Hybrid Journal   (Followers: 180)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Arid Zone Journal of Engineering, Technology and Environment
  [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1596-2490 - ISSN (Online) 2545-5818
   Published by University of Maiduguri Homepage  [1 journal]
  • Influence of magnetically-treated water on some nutritional qualities of
           irrigated tomato fruits

    • Authors: K. O. Yusuf, A. O. Ogunlela
      Pages: 163 - 172
      Abstract: This study assessed the effect of magnetically-treated water on some nutritional qualities of irrigated tomato fruits in term of vitamins A and C contents and concentration of Lead in the tomato fruits. The irrigation water was treated with three magnetic flux densities 124, 319 and 719 gauss (G) produced from electromagnet. The tomato seed (variety UC82B) was planted in 28 buckets in a transparent garden shed for 130 days and irrigated with either magnetically-treated water (MTW) or non-magnetically-treated water (NMTW as the control experiment). Vitamin A, Vitamin C and Lead (Pb) concentration were analyzed from the tomato fruits. The values of vitamin A from tomato fruits irrigated with MTW treated by 124 (T1), 319 (T2) and 719 G (T3) were 0.68 mg/kg, 0.74 mg/kg and 0.80 mg/kg, respectively while vitamin A from tomato fruits for NMTW (Tc) was 0.73 mg/kg. The mean values of vitamin C of tomato fruits irrigated with MTW treated by 124 G, 319 G and 719 G were 117.30 mg/kg, 114.03 mg/kg and 115.10 mg/kg, respectively while vitamin C for NMTW was 113.93 mg/kg. The mean values of Lead concentration in the tomato for MTW were 0.083, 0.090 and 0.083 mg/kg while that of NMTW was 0.07 mg/kg. The values of Lead concentration in the tomato fruits were below the Food and Agriculture Organisation/World Health Organisation (FAO/WHO, 2011) permissible limits (0.1 mg/kg). MTW increased uptake of lead by tomato fruit from the soil by 18.57 to 28.57 %. This uptake of Pb could make the tomato unsuitable for consumption if the concentration of Pb above the WHO permissible limits.
      PubDate: 2017-07-21
      Issue No: Vol. 13, No. 2 (2017)
       
  • Physical and tapping characteristics of muruchi (Borassus aethiopum) flour
           as influenced by moisture condition

    • Authors: A. A. Lawal, A. U. Dzivama, N. A. Aviara, H. Umar, J. John
      Pages: 173 - 183
      Abstract: The influence of moisture content on physical properties and tapping behavior of ‘muruchi’ flour was determined with a view to exploring the possibility of efficient handling at industrial scale. The properties measured were geometric mean diameter, geometric standard deviation, estimated surface area and number of particles per unit gram, loose-filled bulk density and tapped bulk density. Experimental data were simulated using log-normal function to estimate maximum percent mass retained and maximum particle size, while in finite compressibility by tapping and degree of difficulty of tapping were estimated using Sone’s model. Moisture content had a significant influence on the physical properties of the flour. The geometric mean diameter of particle by mass decreased linearly from 286 to 234 µm as moisture content increased from 6.32% to 10.96% (db) while estimated total surface area and number of particles per gram increased linearly from 396.5 to 582.6 cm2, and 515,188 to 1,675,732 particles respectively. The particle size ranged between 75 and 400 µm, where 300 µm particle size was the modal particle size. The estimated maximum percent mass retained and maximum particle size decreased as moisture content increased. Loose-fill bulk density and tapped density had highest and lowest values of 462.46 and 425.35 kg/m3 and 600.71 to 518.53kg/m3 at 6.32% and 10.96% moisture contents respectively. As moisture content increased from 6.32% to 10.96% (db) the maximum volume reduction ratio by tapping decreased from 0.2302 to 0.1797. The infinite compressibility by tapping decreased as moisture content increased while the degree of difficulty of tapping did not show any definitive variation with moisture variation.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Influence of thermal gradient on gas turbine combustor wall using
           impingement/effusion cooling techniques: CHT CFD predictions

    • Authors: A. M. El-jummah, U. Ibrahim, G. E. Andrews, J. E. J. Staggs
      Pages: 184 - 196
      Abstract: Internal wall heat transfer relevant to impingement/effusion cooling techniques was investigated using conjugate heat transfer (CHT) computational fluid dynamics (CFD) with ANSYS Fluent and ICEM commercial software. This work concentrates on the development of CHT CFD design procedures that are applicable to combustor wall and turbine blade heat transfer optimisation in gas turbine (GT). It specifically modelled and compares two configuration which are specifically relevant to the impingement and effusion holes density n (m-2) and is the ratio of the hole pitch X2. The configurations investigated are equal and unequal impingement and effusion holes density n (m-2), respectively, whereby in each case the variation in the number of cooling holes were carried out. The ratio of impingement and effusion number of holes/m2 (or hole density) n, investigated were impingement/effusion: 4306/4306 and 1076/4306, respectively. The geometries were for impingement wall, hole pitch X to diameter D, X/D ratio of ~ 11 but different number of holes N for both n geometries, at a constant offset effusion wall, hole X/D of 4.7 of the same N for both the two configurations. The model geometries have a constant impingement gap of 8 mm with both impingement and effusion walls at 6.35 mm thick Nimonic - 75 material and were computed for varied air mass flux G from 0.1 - 0.94 kg/sm2. Symmetrical applications were employed in modelling each of the geometry, whereby for the impingement hole, only quarter of one hole was modelled, while for the effusion side the holes were either quarter or half modelled. The two n geometries were computed with k - ɛ turbulence model using standard wall functions, which also applies to all G. The predicted locally surface X2 (or hole square area) average heat transfer coefficient (HTC) h values compared with with previously published experimental data showed good agreement. The reduced internal gap flow recirculation with reduced heat transfer to the impingement wall caused by increased number of effusion holes for unequal n impingement/effusion cooling design, shows that wall thermal gradient are higher than that found for equal n.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Development of a motorized tomato (Solanumlycopersicum l.) Slicer

    • Authors: S. K. Shittu, M. Bello, N. D. Dangora
      Pages: 197 - 208
      Abstract: In an attempt to solve the problem associated with slicing of tomato which is an important operation required in tomato drying industries, a motorized tomato slicer was designed fabricated and tested. In tomato processing industry, slicing of tomato is usually done to increase the surface area of the product for effective drying. The machine was designed to slice tomatoes into recommended size of 20mmthick for fast drying. The slicer consists mainly of a feeding unit, cutting compartment, collection unit, power section and tool frame. Tomato fruits fed through the feeding unit go down to the cutting compartment by gravitational force and the reciprocating motion of slicing knives cut the fruits by shearing action. In the design of the tomato slicer, physical properties of UC-82B tomato variety were considered. Results of performance evaluation showed that the machine has anoutputcapacity of468kg/h, percentage loss of 28.40%, and slicing efficiency of 60.34%.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Assessment of Occupational Harzads and Health Problems among Female
           Farmers in North-Eastern Nigeria

    • Authors: M. O. Amodu, M. F. Amodu, J. S. Bimba, M. T. Bolori
      Pages: 209 - 218
      Abstract: Farming is the main occupation of the rural people in Northeastern region of Nigeria. It constitutes 60-75% of the population of the area and involves both male and female alike. However, a postharvest aspect of production is mostly handled by women. Thus the female farmers are more exposed to farming occupational hazards than their male counterparts. The aim of the study was to identify the occupational hazard problems encountered by female farmers in Northeastern region of Nigeria. Specifically, to (i) determine the prevalence of injuries and diseases of women farmers; (ii) assess types of treatments available to women farmers; and (iii) assess the protective measures employed in preventing injuries and diseases. A cross-sectional descriptive study was conducted using a pre-tested questionnaire to collect data. Eight hundred questionnaires were administered. Multistage sample method was used to select the respondents. The results showed that 662 (82.8%) of the female farmers interviewed complained of back pains. Six hundred and twenty-four or (78.0%) of the respondents suffered lacerations from the usage of farm implements such as hoes, axes, sickles, cutlass, and also from grasses and thorns. Insect stings were the third most prevalent diseases and constitute 59.5% of the respondents. Other diseases prevalence were: sunburns, snake bites, fractures, and injuries from falling trees and branches, which constitute 20.6% of the farmers. The respondents got treatments at homes, traditional healers, and hospitals. The use of chemicals was not popular among the respondents, herbicides, (9.8%), pesticides, (13.1%) and insecticides (21.4%). Accordingly, the awareness of the harmful effects of these chemicals was low. Farming activities of the women farmers in northeastern, Nigeria was found to be their means of livelihoods. There is a need to increase agricultural mechanization in order to reduce injuries and pains associated with crude farm tools. Female farmers require more enlightenment on the need of using protective materials for farming activities.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Development and Performance Evaluation of Tomato Dehydrating Machine

    • Authors: C. N. Nwogu, B. N. Nwankwojike, A. A. Adejolu
      Pages: 219 - 228
      Abstract: Tomato (Solanum lycopersicum) is a very important staple food worldwide with about 7,500 varieties consumed in diverse ways including: raw in salads, as an ingredient in many dishes, sauces, ketchup and drinks. Tomatoes deteriorate (rotten) easily due to their high moisture content. A tomato dehydrating machine comprising of a spray gun, cam shaft, delivery pipe, three air blowers, drying trough, base and a speed reduction gear box was designed, fabricated and evaluated. The machine is powered by a 1.5hp electric motor. The developed machine has a dehydration efficiency of 81.45%, throughput of 3.7212kg/hr. The dehydrated tomato produced from the machine has ascorbic acid content, lycopene content, calcium content, potassium content and sugar reduction content of 10.6 mg/100g, 78.24 mg/100g, 10.6 mg/100g, 169.0 mg/100g and 2.9 mg/100g respectively which fell between acceptable ranges for the nutritional content of tomato.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Retinal Vessel Segmentation Based on Primal-Dual Asynchronous Particle
           Swarm Optimisation (pdAPSO) Algorithm

    • Authors: E. G. Dada
      Pages: 229 - 237
      Abstract: Acute damage to the retina vessel has been identified to be main reason for blindness and impaired vision all over the world. A timely detection and control of these illnesses can greatly decrease the number of loss of sight cases. Developing a high performance unsupervised retinal vessel segmentation technique poses an uphill task. This paper presents study on the Primal-Dual Asynchronous Particle Swarm Optimisation (pdAPSO) method for the segmentation of retinal vessels. A maximum average accuracy rate 0.9243 with an average specificity of sensitivity rate of 0.9834 and average sensitivity rate of 0.5721 were achieved on DRIVE database. The proposed method produces higher mean sensitivity and accuracy rates in the same range of very good specificity.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Implementation of Unsplit Perfectly Matched Layer Absorbing Boundary
           Condition in 3 Dimensional Finite Difference Time Domain Method

    • Authors: B. U. Musa
      Pages: 238 - 251
      Abstract: The C++ programming language was used to implement three-dimensional (3-D) finite-difference time-domain (FDTD) technique to simulate radiation of high frequency electromagnetic waves in free space. To achieve any meaningful results the computational domain of interest should have to be truncated in some way and this is achieved by applying absorbing boundary conditions. A uniaxial perfectly matched layer (UPML) absorbing boundary condition is used in this work. The discretised equations of the UPML in FDTD time stepping scheme were derived and has been successfully implemented using the computer program. Simulation results showed that the UPML behaves as an absorber. This was confirmed by comparing the results with another boundary condition, the Mur ABC.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Performance of some General Circulation Models on Predicting Temperature
           and Rainfall in the Sudan-Sahel Region of Nigeria

    • Authors: M. F. Amodu, C. J. Ejieji
      Pages: 252 - 267
      Abstract: Twenty Global Circulation Models (GCMs) were evaluated by comparing their predictions of monthly average air temperature and monthly rainfall amounts of the sudan-sahel region of Nigeria with observed data for the period 1981 to 2000. The GCMs were those in the Program for Climate Model Diagnosis and Intercomparison (PCMDI) of the World Climate Research Program's (WCRP's) Coupled Model Intercomparison Project Phase 3 (CMIP3). The observed data were from four representative stations namely Kano, Katsina, Maiduguri and Sokoto. Coefficient of correlation (r), mean absolute error (MAE) and root mean square error (RMSE) were used as metrics for ranking the GCMs.  None of the GCMs was superior in performance across the four representative stations. The trends of observed average monthly air temperature were generally better simulated with positive r-values in contrast with their monthly rainfall predictions which correlated negatively with observed data. The r-values for temperature averaged 0.211, 0.092, 0.373 and 0.212 for Kano, Katsina, Maiduguri and Sokoto respectively. For rainfall, the r-values averaged -0.216, -0.280, -0.115 and -0.351 for Kano, Katsina, Maiduguri and Sokoto respectively. Simulated rainy season commenced 4 to 6 months earlier than observed depending on the particular GCM. The average MAE from the GCMs for the respective stations ranged from 5.23 to 14.31 K for temperature and 81.91 to 91.99 mm for rainfall. For RMSE, the averages from the GCMs ranged from 5.84 to 14.42 K for temperature and 140.21 to 187.99 mm for rainfall. The results of the study have provided the basis for selection of appropriate GCMs for the locations for further downscaling procedures that might be required for the application of a selected GCM to climate change projection.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Equilibrium Kinetics and Thermodynamic Studies of the Adsorption of
           Tartrazine and Sunset Yellow

    • Authors: F. O. Okeola, E. O. Odebunmi, O. M. Ameen, M. A. Amoloye, A. A. Lawal, A. G. Abdulmummeen
      Pages: 268 - 280
      Abstract: Batch adsorption experiment was carried out on freema (combination of Tartrazine and Sunset Yellow) an adsorbent prepared from moringa pod. The adsorption capacity of the adsorbent was determined. Effect of such factors as initial concentration of the adsorbate solution, contact time with the adsorbent, pH of the dye solution, and temperature of the dye solution on the adsorption capacity of the absorbent was determined. The result showed that the optimum adsorption was attained at pH of 3, adsorption equilibrium was attained within 60 min. The adsorption capacity increases with increase in initial concentration of the dye solution. The result of the kinetics study showed that the adsorption process was better described by the pseudo-second order rate equation. The adsorption process fitted well with both Freundlich (R2 = 0.983) and Langmuir (R2 = 0.933) models. Thermodynamic result showed ΔH and ΔS were all negative. Gibbs free energy change (ΔG) increases with increase in temperature of the dye solution.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Development of a Model for Predicting Water melon yield in a Semi-Arid
           region of Nigeria.

    • Authors: A. Dauda, K. D. Maina
      Pages: 281 - 287
      Abstract: A mathematical model for predicting the yield of watermelon using soil and plant properties was developed from a two year field experiment which was conducted in 2013 and 2014 to investigate the effect of different tillage methods on the physical properties of sandy loam soil, growth and yield of water melon (Citrullus vulgaris) on a sandy-loam soil in a semi-arid environment. The Tillage treatments were disc ploughing plus disc harrowing (DP+DH) as conventional tillage (CT), double disc ploughing (DDP), double disc harrowing (DDH),  disc ploughing (DP) and disc harrowing (DH) as minimum tillage (MT) and zero tillage (ZT) as direct drilling method (control).  The model was developed from soil properties like bulk density, moisture content and penetration resistance. The plant properties were leave area index, plant length, number of fruits per plant, fruit length, fruit weight, fruit diameter, and yield per hectare.  The assumptions were derived from empirical results. It is a linear function with some non linear variables. It is therefore reasonable to take the model as non linear function that was solved using non linear regression procedure using SPSS Version 16 computer program. The model was validated by comparing the predicted yields by the model with the actual obtained yields from the experiments. This procedure minimized the error due to deviations and therefore rendered the solution more accurate as could be seen from the improved R2.The model gave a good agreement of calculated watermelon yield with linear relationship of (r2=0.98).
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Physical Properties and Specific Heat Capacity of Tamarind (Tamarindus
           indica) Seed

    • Authors: A. Dauda, N. A. Aviara, E. A. Garba
      Pages: 288 - 300
      Abstract: This study investigated the effect of moisture content on physical properties and specific heat capacity of Tamarindus indica seed. Physical properties investigated were axial dimensions, one thousand seed weight, bulk and true densities, porosity, roundness and sphericity, surface area, angle of repose and static coefficient of friction. The thermal property determined was the specific heat. These properties of Tamarindus indica seed were investigated within the moisture content range of 7.55 - 10.47% (d.b). The length, width and thickness increased from 9.979 to 10.634mm, 8.909 to 10.089mm and 5.039 to 5.658mm, respectively in the above moisture range. One thousand seed weight, surface area, seed volume, true density and porosity,  increased from 388.4 to 394.8g, 86.916 to 87.58cm2, 0.353 to 0.366cm3, 1217.5 to 1287.00kg/m3 and 28.22 to 33.87%, respectively, as moisture content increased in the above range, while bulk density decreased from 873.9 to 851.4kg/m3. Roundness and sphericity, and angle of repose also increased from 41 to 42.4% and 73.7 to 76.3% and 36.1 to 38.93o, respectively.  Specific heat capacity values increased linearly from 589.00J/kgK to 638.61 J/kgK in the above moisture range.
      PubDate: 2017-07-21
      Issue No: Vol. 13, No. 2 (2017)
       
  • A Simple Slow-Sand Filter for Drinking Water Purification

    • Authors: K. O. Yusuf, K. R. Adebayo, I. E. Onah
      Pages: 301 - 306
      Abstract: Water-borne diseases are commonly encountered when pathogen-contaminated water is consumed. In rural areas, water is usually obtained from ponds, open shallow wells, streams and rain water during rainy season. Rain water is often contaminated by pathogens due to unhygienic of physical and chemical conditions of the roofs thereby making it unsafe for consumption. A simple slow sand filter mechanism was designed and fabricated for purification of water in rural areas where electricity is not available to power water purification devices. Rain water samples were collected from aluminum roof, galvanized roof and thatched roof. The waters samples were allowed to flow through the slow sand filter. The values of turbidity, total dissolved solids, calcium, nitrite, faecal coliform and total coliform from unfiltered water through thatched roof were 0.92 NTU, 27.23 mg/l, 6 mg/l, 0.16 mg/l, 5cfu/100ml and 6.0 cfu/100ml, respectively while the corresponding values for slow sand filter from thatched roof were 0.01 NTU, 0.23 mg/l, 2.5 mg/l, 0.1 mg/l, 0 cfu/100ml and 0 cfu/100ml, respectively. The values of turbidity, total dissolved solid, nitrite, calcium, faecal coliform and total coliform from unfiltered water for aluminum roof were 0.82 NTU, 23.68 mg/l, 2.70 mg/l, 1.0 mg/l, 4 cfu/100ml and 4cfu/100ml, respectively while the corresponding values for slow sand filter were 0.01 NTU, 0.16 mg/l, 0.57 mg/l, 0.2 mg/l, 0 cfu/100ml and 0 cfu/100ml, respectively. The values obtained for galvanized roof were also satisfactory. The slow sand filter is recommended for used in rural areas for water purification to prevent risk of water-borne diseases.   
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
  • Numerical Simulation of Air Temperature and Velocity in a Naturally
           Ventilated Office

    • Authors: S. Shodiya, M. B. Oumarou, G. M. Ngala, A. B. Mohammed
      Pages: 307 - 314
      Abstract: This paper presents a numerical simulation of air velocity and air temperature distribution in an office room of Computer Engineering Department of University of Maiduguri which is naturally ventilated. The office room under investigation with the dimension 5 m × 5 m × 4 m has a door in the East direction, and two windows, one in the East direction and the other in the South direction. For cost effectiveness, numerical solutions of steady-state airflow and heat transfer were done using a complete two-dimensional model. The results showed that the windows and the door could not undertake indoor heat load that can make the occupants to be thermally comfortable. In activity area where people sit and stand, the air velocity is moderate, this is about 0.98 m/s on the average. In addition, the temperature in this area is relatively high of about 302 K (29 °C) on the average. Based on the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) standard for comfort environment in summer (air temperature: 293 – 299 K (20 – 26 °C); air velocity: 0.5 – 0.8 m/s), the natural ventilation for the office room cannot give a thermal comfort for the inhabitant of the room. However, a window, if installed opposite the door could improve the ventilation of the office.
      PubDate: 2017-04-01
      Issue No: Vol. 13, No. 2 (2017)
       
 
 
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