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  Subjects -> ENGINEERING (Total: 2526 journals)
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ENGINEERING (1326 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 7)
ACS Nano     Hybrid Journal   (Followers: 318)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
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: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 9)
Advanced Journal of Graduate Research     Open Access  
Advanced Nonlinear Studies     Hybrid Journal  
Advanced Science     Open Access   (Followers: 6)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 11)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 6)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 10)
Advances in Engineering Software     Hybrid Journal   (Followers: 28)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 14)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 24)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Nonlinear Analysis     Hybrid Journal  
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 16)
Advances in Polymer Science     Hybrid Journal   (Followers: 45)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 51)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Al-Nahrain Journal for Engineering Sciences     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 12)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 25)
Anadolu University Journal of Science and Technology A : Applied Sciences and Engineering     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
Annals of Regional Science     Hybrid Journal   (Followers: 8)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
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: 7)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 20)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 14)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 6)
Applied Sciences     Open Access   (Followers: 4)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 9)
Arid Zone Journal of Engineering, Technology and Environment     Open Access   (Followers: 2)
Arkiv för Matematik     Hybrid Journal   (Followers: 2)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 2)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 9)
Asian Journal of Control     Hybrid Journal  
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  
AURUM : Mühendislik Sistemleri ve Mimarlık Dergisi = Aurum Journal of Engineering Systems and Architecture     Open Access  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autocracy : Jurnal Otomasi, Kendali, dan Aplikasi Industri     Open Access  
Automotive Experiences     Open Access  
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: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 2)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
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)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 12)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering     Hybrid Journal   (Followers: 2)
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: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomicrofluidics     Open Access   (Followers: 5)
BioNanoMaterials     Open Access   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Bitlis Eren University Journal of Science and Technology     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers Droit, Sciences & Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 32)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Carbon Resources Conversion     Open Access   (Followers: 1)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 6)
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     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 3)
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)
Ciencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 3)
CienciaUAT     Open Access   (Followers: 1)
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: 13)
City, Culture and Society     Hybrid Journal   (Followers: 23)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Hybrid Journal   (Followers: 8)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 3)
Cognitive Computation     Hybrid Journal   (Followers: 3)
Color Research & Application     Hybrid Journal   (Followers: 3)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 15)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Information Science and Management Engineering     Open Access   (Followers: 4)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 29)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 293)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 232)
Composites Part B : Engineering     Hybrid Journal   (Followers: 271)
Composites Science and Technology     Hybrid Journal   (Followers: 204)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 17)
Computational Optimization and Applications     Hybrid Journal   (Followers: 8)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)

        1 2 3 4 5 6 7 | Last

Journal Cover
Arid Zone Journal of Engineering, Technology and Environment
Number of Followers: 2  

  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]
  • TABLE OF CONTENTS VOL. 14 NO. 3 (2018)

    • Authors: Editor AZOJETE
      Abstract: We are happy to announce the publication of Volume 14(3), September, 2018 of our Journal. The issue showcases articles from the fields of Agricultural and Biological Engineering, Electrical and Electronic Engineering, Mechanical Engineering and Civil Engineering. Contributors from other Engineering fields, investigators working in the Energy field and those providing solutions to problems arising from global warming, desertification and flood control, as well as researchers in the fields of Science, Technology and Environment are hereby encouraged to submit their articles to the Journal. The AZOJETE website: http://www.azojete.com.ng has been upgraded to serve you better. We encourage our Readers and Contributors to visit the website to read and download articles since our Journal is operating on Open Access.   We thank all authors and the diverse team of specialist reviewers for their contribution to this Edition, and look forward to a continuing process of bringing you articles showcasing research at the leading edge of our subject focus (as they emerge globally) in every succeeding Volume and Issue of AZOJETE.   At the moment, articles are already being assessed for Volume 14(4), December 2018. We have continued to improve on our indexing status and are present now in several Scientific Data bases.   Thank you.     Prof. Ndubisi A. Aviara (Editor-In-Chief)
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Design and Construction of an Improved Biogas Stove

    • Authors: E. K. Orhorhoro, J. O. Oyejide, S. A. Abubakar
      Pages: 325 - 335
      Abstract: Increasing demand for wood and fossil fuel with limited availability has resulted in environmental pollution. Availability of energy for cooking remains a major concern for average Nigerian. Cooking is an essential daily household activity and it consumes significant quantities of energy and human effort. The hazardous effect of wood and fossil fuel coupled with the cumbersome nature in cooking with wood and fossil fuel make it necessary for search of an alternative means of energy that is renewable. In this research work, design and construction of an improved biogas fuel stove were carried out. The stove comprises of a combustion chamber where the biogas fuel is burned by natural convection mode. The biogas stove consists of the following major components; burner, injector opening, mixing tube, burner support, etc. The biogas stove was constructed from medium carbon steel material. The choice of the selected material has to do with cost, and local availability. The distance between the cooking pot and the stove burner is 40mm, and the gap between each of the port is 5 mm. Mixing tube lengths of 80mm, tube inner diameter of 15mm, and gap diameter of 2.5mm between each ports were adopted in this design. The results obtained show that an average efficiency, minimal efficiency, optimal efficiency of 56.894 %, 46.02 %, and 63.87 % respectively were obtained. Also, an average mass of water of 3.5 kg, an average evaporated mass of water of 0.0208 kg, and an average mass of fuel of 0.0551 kg were obtained. With this designed and  adoption of biogas fuel stove as means of cooking, the usage of wood and fossil fuel will be reduce, thus preventing the liberation of hazardous gases to our eco-system.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Time-Frequency Analysis of the Pri Modulated and Frequency Hopping Radar
           Signals Using Spectrogram

    • Authors: A. A. Ahmad, A. S. Saliu, C. L. Wamdeo, S. Lawan
      Pages: 336 - 345
      Abstract: Electronic warfare (EW) is drawing more attention in recent years. This is due to the dependency on electronic communication by both civilian and military worldwide. Despite all the measures to secure electronic communication, hostile parties such as terrorist groups, religious sects and multi-national corporations attack electronic communication. This paper proposes a set of algorithms to efficiently analyse the pulse width (PW), pulse repetition interval (PRI) and center frequency of radar signals. The aim is to use these accurately determined time and frequency parameters to determine capability of the emitted electromagnetic radar wave. The method involve the use of spectrogram time-frequency distribution (TFD) and other related statistical signal processing tools such as Hilbert transform and instantaneous frequency to process these radar signals using the MATLAB. The validation using the Monte Carlo simulation shows that probability of correct parameter estimation (POCPE) of 100% was achieved at signal to noise ratio (SNR) greater than (or equal to) -11dB and -1dB for time-based and frequency-based parameters respectively. The results obtained also show the method developed is efficient for signal analysis in the field of EW.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Transforming Bauchi Urban Water Distribution System Map

    • Authors: S. S. Garba, Z. M. Baba, J. D. Dodo
      Pages: 346 - 354
      Abstract: Maps are important in running urban utilities. The map available at utility organization such as Bauchi State Water Board is often inadequate in view of the possibilities of modern maps to meet needs such as design, construction, maintenance and research. The available map was assessed, scanned and georeferenced. Together with high-resolution image (Pleiades image of 0.2m spatial resolution), the water network was digitized. Management staff and technical staff were asked on their knowledge of map and modern mapping facilities. They were also asked on how they use the existing map in their routines. There is lack of general map properties like scale and projection on the existing map. There is lack of understanding amongst the management of modern mapping tools; there was low usage of the map (probably because of the map inadequacy). The existing map was transformed into a digital map and georeferenced. Further, it was digitized allowing for each elements of the water network to be uniquely represented. This study therefore recommends that the material of this research could be integrated into the existing system of BSWB as well as in GIS framework for education and proper utilization of the resources by the immediate community.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Assessing Catfish Pond Effluent on Soil Physicochemical Properties and its
           Suitability for Crop Production

    • Authors: O. E. Omofunmi, O. Ilesanmi, A. A. Alli
      Pages: 355 - 366
      Abstract: Soil physical and chemical characteristics of catfish pond effluent land disposal at fish farm village in Ikorodu district, Lagos State, Nigeria were investigated to determine its suitability for irrigation system and for crop production. The physical and chemical properties investigated include: textural class, bulk density, water holding capacity, porosity, hydraulic conductivity, organic matter, total nitrogen, total phosphorus and potassium. The samples of soil were taken between 0 – 90cm at 30cm intervals and analyzed for required physical and chemical properties. Results showed that the soil of the study area belongs to two different textural classes: clay loam and sandy clay loam. The sandy clay loam was dominant with (67%) soil textural class in the study area. The means ± S.D value across depth for bulk density was (1.43 ± 0.22) g/cm3, water holding capacity (25.05±0.65) %, porosity (36.87 ± 10.55) %,  hydraulic conductivity (0.22 ±0.14) cm/hr, organic carbon (0.66 ± 1.55) mg/kg, nitrogen (24.30 ± 1.50) g/cm3, phosphorus (6.93 ± 0.20) g/cm3 and potassium (3.40 ± 0.10) g/cm3 and they were within the recommended critical values of 1.25 – 1.45 g/cm3, 26.25 – 35.50%, 26.25 – 50.00%, 0.20 – 0.30cm/h, 5.0 – 7.5, 10 – 12mg/kg, 20 – 30g/cm3, 6.6 – 18.0g/cm3 and 3 – 6g/cm3 for optimum agricultural production. Findings indicated that the concentrations of nutrients in the site before catfish effluent discharge were lower than concentration after discharge.   Hence the soil physical and chemical properties obtained at fish farm village showed that pond effluent are suitable for\ crop production.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Scene Reconstruction from Multiple Images with Single Centre of Projection

    • Authors: A. I. Audu, A. H. Sadka
      Pages: 367 - 376
      Abstract: One problem which has remained deeply rooted in multi-view geometry is the reconstruction of a three-dimensional (3D) scene starting with multiple two-dimensional (2D) representations of different parts of the same scene. In this paper, the main focus is to perform metric reconstruction of a three-dimensional scene from multiple image samples using sparse bundle adjustment algorithm. In most of the multi-view cases which have been documented in literature, acquisition cameras are assumed to have different centers of projection. The focus here is on the unique problem of refining visual reconstruction which yields camera pose and calibration, and three-dimensional structure estimate when multiple views have a single center of projection.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Determination of Optimal Mix for Acid Reclamation of used Engine Oil

    • Authors: B. N. Nwankwojike, O. S. Onwuka, A. A. Lewachi, T. C. Nwadiugwu
      Pages: 377 - 380
      Abstract: The effects of varying ratio of used engine oil and sulphuric acid, with kaolin as contacting agent, on reclaimed oil properties was analyzed in this study using response surface methodology. Results revealed optimal used engine oil-acid ratio of 1: 6.3. The reclaimed oil obtained from this optimal ratio has viscosity at 100°C, viscosity at 40°C, viscosity index, specific gravity, pour point, flash point and total acid number as 12cst, 120cst, 92.87, 0.85, 9°C, 177°C and 0.53mg/KOH respectively. Also, the engine oil reclaimed from this optimal mix gave values of viscosity at 40°C, specific gravity and total acid number so close to that of a standard grade/fresh lube oil.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Drinkable Water Stored in Hot Climates: Interactions among Water Quality
           Parameters

    • Authors: F. J. Ogbozige, F. B. Ibrahim, D. B. Adie
      Pages: 381 - 390
      Abstract: The lack of water mostly in the arid regions of the world has triggered water users to store water in different container materials. The situation is more pronounced in countries having epileptic power supply since pumping of groundwater whenever needed could not be guaranteed due to poor power supply. However, most water users bothered not about the quality of the water during storage. Hence, this paper investigated the chemistry of stored water especially in the arid regions which are usually known to have high solar heating during the dry season. In order to achieve this aim, two sources of potable water (tap and borehole water) were stored in twelve water storage containers (six for each water source) for a period of six weeks. The containers include black plastic tank, blue plastic tank, green plastic tank, coated steel metal tank, uncoated steel metal tank and clay pot. However, the water quality parameters examined were temperature, colour, total solids, dissolved oxygen (DO), chlorine content, pH, total hardness, and total heterotrophic bacteria (THB) which were all analyzed at a sampling frequency of seven days interval. Results showed that the colour of both water sources stored in uncoated steel metal tanks stretched from 5 TCU – 20 TCU, which indicates that the colour of water stored in these tanks were above the limit set by WHO (15 TCU) during certain period of storage. Similarly, values/concentrations of pH and THB in all the storage containers were found to exceed the limits set by WHO standard during certain periods (weeks) of retention for both water sources. This is because the pH value ranged from 5.8 - 8.7 while THB concentration ranged from 2.0×102 CFU/100ml - 1.56×104 CFU/100ml which are contrary to their allowable permissible limits (6.5 - 8.5 and 0.00 CFU/100ml - 1.0×104 CFU/100ml respectively). Nevertheless, the remaining water quality parameters were within the WHO permissible limits in all the storage vessels during the retention period. Hence, it was concluded that most water quality parameters of potable water stored in hygienic condition remain fresh during the first week of storage thereafter, the quality cannot be guaranteed.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Phytoremediation of Primary Sewage in Vertical Flow Constructed Wetlands

    • Authors: O. E. Ewemoje, A. Y. Sangodoyin
      Pages: 391 - 403
      Abstract: The study examined the performance of pilot scale vertical flow constructed wetland in phytoremediation of primary sewage lagoon effluent generated from a tertiary institution. The experimental layout consists of four units, with each unit composed of three cells connected in series. Three of the units were vegetated while non-vegetated units serve as control.  The cells are rectangular plastic beds of 1.2m x, 0.9m x 0.4m. Treatment areas were packed with gravel of 40, 10 - 25 and 2-10mm diameter respectively. Three cells were each planted with Rhynchospora corymbosa (RC) and, Coix lacryma-jobi (CL) while the third cell contains a mixture of the two plants. The fourth cell was left unplanted and serves as a control. All the cells were operated at hydraulic retention times of 4, 7, and 10 days. High reduction of COD, NH3, NH3-N and NH4 were observed in all the units. The unit with the lowest removal efficiency for these parameters was the control thus demonstrating the effectiveness of phytoremediation. Removal efficiency for the parameters considered range from 40 to 50% for RC and 50 - 53% for Coix.  A TSS influent concentration of 6800 mg/1 was reduced by 86.1% to 268 mg/1 for HRT of 7 days and a further reduction of 96.3% for HRT of 10 days. Treatment efficiency as high as 76 to 100% was observed with increase in HRT from 4 to 10 days, for particulate phosphorus, PO4, NH4-N, NH4 and COD. The removal rate for most parameters increased with longer HRT. Results indicate that the combination of the two plants in the same reactor was not as effective as single plant in individual cells. Rhynchospora corymbosa and Coix lacryma-jobi plants reduced the pollutants in sewage, hence these could be effectively used in wetlands for the treatment of primary sewage.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Structural Integrity Assessment of an Uncompleted Reinforced Concrete
           Structure in Maiduguri, Nigeria

    • Authors: A. M. Alkali, I. S. Muhammad, K. Bulu
      Pages: 404 - 410
      Abstract: Structural integrity assessment of an existing structure/building was carried out to determine its reliability to addition further load while fulfilling its intended function. From the assessment result, the building had shown a yielded slab, probably due to observable deterioration of the building elements (Block D).  Further assessment of this study’s result reveals the major cause for that concern, and it is due to low slab strength value (NDT <20N/mm2). Additionally, the structural deterioration which has occurred is as a direct result of the neglect and inability to appropriately drain rain water on the slab from the building. Therefore, this study’s result indicates that, the components (Block D) does not have adequate resistance to cater for future loads, because of the demonstrated structural failures associated with the building(slab) in question. The masonry walls of the building’s non-structural components were also observed to be having some extent of cracks and other distress. It is therefore recommended that reconstruction of the distressed area be carried out. Study further suggest combination of tests, instead of performing just one type of test, provide more suitable results to confidently accept or reject the structure as a whole or its component for future use.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • An Ubiquitous System for Monitoring of Motor Bike Base Patrol Troops in
           Insurgency Prone Area

    • Authors: I. Agaji, H. Mikailu, S. A. Kile
      Pages: 411 - 419
      Abstract: The world has come under increased terrorists attack in recent times. In Nigeria the fight against Boko Haram terrorists has taken toll on both the armed forces and insurgents in terms of casualties. Traditional methods of gathering and processing information have yielded little success. In this work we propose a ubiquitous security system that monitors mobile troops on bikes and transmits reports to a control centre for immediate action if required. The system was implemented using Java, MySQL, JBOSS 4.2.2.GA Server, and macromedia Dreamweaver 8.0. Four experiments were carried out with the system and the results indicated a great measure of passing information between the mobile bike based agents and the central control command. The system is recommended for use because it serves as a good replacement or can complement the use of traditional methods of monitoring troops in an insurgent prone area. The physical implementation of the system will require sensory network devices that will detect the presence of metals, high noise level and a camera monitoring subsystem to detect the presence of insurgents.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Effect of Double Thermal Ageing Treatment on the Hardness and Corrosion
           Resistance of Al- Cu- Si- Ni Alloy in NaCl Solution

    • Authors: M. Abdulwahab, O. B. Umaru, M. A. Bawa, S. M. Adams, C. S. Ezema
      Pages: 420 - 425
      Abstract: This work investigated the Corrosion behavior and hardness characteristics of double thermally treated Al-Cu-Si-Ni alloy in NaCl solution. The alloy was produced using sand casting method, and sectioned into small pieces of 10mm long each. Some of the sectioned samples were subjected to single thermal ageing treatment (STAT) and used as control, while others were subjected to double thermal ageing treatment (DTAT). The thermally treated samples were used for corrosion and hardness test in accordance with ASTM A370 and ASTM E8-08b. The result showed that the double thermally treated samples have higher hardness value than the single thermally treated samples as the ageing time increases with an increase of 24.6% at 2hrs. Equally, the corrosion resistance of the treated alloy improved with ageing time.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Development of Software for Condition Monitoring of Manufacturing Systems

    • Authors: C. P. Nwadinobi, B. N. Nwankwojike, F. I. Abam
      Pages: 426 - 436
      Abstract: Equipment Condition Management for predicting the health condition of manufacturing systems was developed. This software implements availability, preventive maintenance probability, failed state probability and state duration as performance functions for manufacturing systems. Thereby eliminating lengthy and error-prone manual computations associated with prediction of performance indicators of manufacturing equipment from any given operational and process data setting. It incorporates various stages of deterioration and maintenance states and also capable of computing the predicted average time before system failure occurs.  This permits in the determination of the most suitable decision to improve the reliability of an industrial equipment. The prediction result identifies the effectiveness of the proposed method in predicting overall wellbeing of manufacturing systems.  
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Thermal Properties of Jatropha Seeds

    • Authors: J. Audu, S. V. Irtwange, A. A. Satimehin
      Pages: 437 - 449
      Abstract: The thermal properties of Jatropha seeds were investigated for two accessions and in the moisture range of 4 - 16% db. Specific heat was determined using the method of mixtures, bulk thermal diffusivity was determined using the transient method (Dickerson apparatus), while the bulk thermal conductivity was calculated. The results obtained for specific heat ranged from 739.5 – 1560.1J/kg oC for native and 667.4 – 1262.21J/kg oC for improve accessions in the above moisture range. Bulk thermal diffusivity ranged from1.1x10-6 - 1.71x10-6m2/s and 1.29x10-6 m2/s - 1.83X10-6 while bulk thermal conductivity ranged from 0.276 - 0.907 W/moC and 0.283 - 0.797 W/moC for native and improved accessions respectively. ANOVA and means separation (Duncan multiply range test) at 95% confidence level was carried out for specific heat, thermal diffusivity and thermal conductivity. ANOVA showed that moisture had a significant effect on specific heat and bulk thermal conductivity but not on bulk thermal diffusivity. The mean separation shows that for native accession a significant change occured (p<0.05) for specific heat at the moisture contents of 4 and 16%. For the improved accession, the specific heat was significantly different (p<0.05) only at moisture of 8 and 16%. For bulk thermal diffusivity, moisture did not have any significant effect (p<0.05) on either the native accession or the improved accession.  Bulk thermal conductivity was significantly affected (at p<0.05) by moisture content only in the native accession but not in the improved accession. The mean separation showed that significant change (p<0.05) in thermal conductivity occurred at the moisture contents of 4 and 16%. This study also shows that increase in moisture content of Jatropha seeds increase all three thermal properties studied irrespective of the accession. Regression analysis shows a high R square grater than 0.9 for all thermal properties studied.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Statistical Modelling of Oil Expression from Neem Seed using a Screw Press

    • Authors: B. A. Orhevba, O. Chukwu, D. Zinash, M. O. Sunmonu
      Pages: 450 - 468
      Abstract: A study was carried out to determine the effect of some process parameters on the yield of neem seed oil from a screw press using 44 factorial design experiments. This consisted of four independent, randomly assigned parameters at four levels each namely, moisture content (wb) of seeds (6.3%; 8.1%, 13.2% and 16.6%); temperature of heating at ϴ1 (55°C), ϴ2 (70°C), ϴ3(85°C) and ϴ4 (100°C); duration of heating at t1 (5 min.), t2(10 min.), t3 (15 min.) and t4 (20 min.) and machine pressure at p1 (602.91 kN/m2), p2 (723.07 kN/m2), p3(925.84 kN/m2) and p4(1334.88 kN/m2). Three replicates of the experiments were carried out and from the values obtained, oil yield was calculated. The effects of the processing conditions (moisture content, heating duration, heating temperature and machine pressure) on the oil yield were investigated using analysis of variance (ANOVA) at p≤0.05 and the levels of the significant means were further evaluated using Duncan’s New Multiple Range Test (DNMRT). Mathematical model was developed to express the oil yield with respect to the process parametersand this was fitted to experimental data using MATLAB 8.0 software package. Adequacy of the model was authenticated using coefficient of determinationand adjusted coefficient of determination, R2.The results obtained showed that temperature, heating time, moisture content, pressure and their interactions all proved to determine the outcome of oil yield of neem seed. The highest oil yield of 33.55% was obtained at temperature of 81.98°C, pressure of 1067.23kN/m2, moisture content of 9.03% and heating duration of about 20 min.Theresults obtained(coefficient of determination and adjusted coefficient of determination R2) indicated that the model generated was statistically adequate.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Effect of Fence Design on Natural Ventilation in Residential Spaces: An
           Experimental Study

    • Authors: O. M. Idowu, S. M. Junaid, S. Humphrey
      Pages: 469 - 477
      Abstract: Fences are often designed as territorial markers to assert defensibility of spaces, and enhance the potentials for ‘prospect-refuge’ in private residential developments. In the tropics where natural ventilation is a critical functional requirement, fences may be antithetical to air movement around and within enclosed residential spaces. This simulated experimental study sought to ascertain the effect of fences on natural ventilation in residential spaces. An architectural model of a 2-bedroom house on (with cross ventilated living room and bedrooms) a rectangular plot enclosed by 2.1m high fence was the object of the study. Six fences of different porosities (0.0% to 29.4%) and porosity-height (0.2m to 1.6m above ground) on the approach side of the plot, and 6m from the house were exposed to simulated wind (generated by a solar-powered standing fan) at 30o, 60o and 90o; the other three side-fences were kept solid. These were in addition to a case of the approach side without fence. Three hot-wire anemometers were deployed to simultaneously measure wind speeds outside the plot, in the living room (6.0m x 4.2m; 21.4% window area)and a bedroom(3.6m x 3.6m; 27.8% window area) of the house. About thirty readings at ten seconds intervals were taken in each space and wind direction. Ventilation coefficients for the spaces were computed from mean values of observed wind speeds.  Mean ventilation coefficient values of the seven fencing cases were compared for each space using Analysis of variance (ANOVA) to establish any significant difference (at 0.05 level of significance).Ventilation coefficients ranged from 0.02 to 0.46 in the living room, and 0.04 to 0.21 in the bedroom across wind directions. The highest values were obtained from approach side without fence; and contrary to expectation, fence of the highest porosity produced ventilation coefficients lower than the solid (non-porous) fence.In the three wind directions, significant differences were found in the ventilation coefficients of the living room; while in the bedroom, two of the wind directions resulted in significant differences in ventilation coefficients from the fence designs.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Mathematical Profile of Automatic Speech Recognition Algorithm

    • Authors: S. A. Y. Amuda, Oladimeji Ibrahim
      Pages: 478 - 490
      Abstract: This work provide mathematical insight to Automatic Speech Recognition (ASR) system’s algorithm such that, the intricacy of the system becomes a simplified correlation of the ASR algorithm to the physical form using the mathematical flowchart which clearly and uniquely show the link from one stage of the algorithm to the other. The mathematical profile of the ASR algorithm starts from the data input module, through noise cancellation module, voice activity detection module, pre-processing module, Linear Predictive Coding (LPC) based feature extraction module, then provides alternate root for both Dynamic Time Wapping (DTW) and Hidden Markov Model (HMM) based pattern matching module after which the output is fed to the final decision module of the ASR algorithm. The modern research outputs has improved the robustness of each stage of the algorithm but the approach used here focused on the basics of each stage which helps in easy and better understanding of the ASR system. It also aid in the evaluation and create necessary intuition for decoding problems of the recent ASR systems for new researchers in the research area.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Tuning of a PID Controller Using Cultural Artificial Bee Colony Algorithm

    • Authors: B. H. Adebiyi, M. B. Mu’azu, A. M. S. Tekanyi, A. T. Salawudeen, R. F. Adebiyi
      Pages: 491 - 496
      Abstract: This research is aimed at developing  a cultural-algorithm based artificial bee colony algorithm (CABCA) for improved Proportional Integral Derivative (PID) controller parameters tuning. The normative and situational knowledge inherent in cultural algorithm were utilized to guide the step size as well as the direction of evolution of Artificial Bee Colony (ABC) at different configurations, in order to combat the disparity between exploration and exploitation associated with the standard ABC, which results to poor convergence and optimization efficiency. Consequently, four variants of CABCA (CABCA(Ns), CABCA(Sd), CABCA(Ns+Sd) and CABCA(Ns+Nd)) were accomplished in MATLAB R2015a using different configurations of  cultural knowledge. A total of 20 standard applied mathematical optimization test functions (Ackley, Michalewicz, Quartic, Sphere etc) were employed to evaluate the performance of each CABCA variant. The results indicate that CABCA(Ns) performed best in 4 test functions (20%), CABCA(Ns+Nd) also in 4 functions (20%), while CABCA(Sd) and CABCA(Ns+Sd) performed best in 3 test cases (15%) and 2 test cases (10%) respectively. On the remaining 7 test functions (35%) of their results were similar. The CABCA(Ns) was chosen as the best performed variant based on the success ratio, which is the number of successful runs that found the solution. Hence, CABCA(Ns) was  used to obtain the optimal parameters  and  of a PID controller which was employed in the speed control of a DC motor. The DC motor attained steady-state in 0.4178s with the CABCA-based PID controller as against 0.6778s and 2.2057s obtained using standard ABC and Ziegler-Nichols (Z-N) tuned PID controllers, respectively.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Development of Hybrid Analitical-Particle Swarm Optimization Algorithm
           (Hapsoa) for Optimal Placement of Distributed Generation Units and
           Application to Jimeta Electricity Distribution Network (JEDN)

    • Authors: M. H. Shallangwa, B. U. Musa
      Pages: 497 - 507
      Abstract: Optimal Location and Sizing of Distributed Generation (DG) units are a promising solution to many power system problems such as voltage regulation, power loss among others.  In this work a method termed Hybrid Analytical Particle Swarm Optimization Algorithm (HAPSOA) was developed. HAPSOA comprised of two stage optimization approach. The first stage involved the determination of optimal DG sizes using analytical approach. In the second stage, the DG sizes obtained in the first stage were further optimized using a constrained Particle Swarm Optimization (PSO)-based approach while determining an optimal DG location on the network busses. HAPSOA was tested on IEEE 30, 33 and 69 buses for optimal DG placement and sizing. Results showed that a maximum DG size of 97 kW, 27.4 kW and 32.8 kW were deployed on the three buses. These improved the voltage profile of the buses by 27.78%, 25.21%, and 28.15% respectively. Optimal DG placement and sizing analysis was extended to Jimeta Electricity Distribution Network (JEDN). Here also, results showed that a maximum DG size of 2.165 kW was placed on NASSARAWO feeder, which resulted in an improved voltage of 34.33% and a power loss reduction of 18.86%. The smallest DG of 0.122kW was placed on FUTY network and this improved the voltage profile by 48.74% and a real power loss reduction of 28.57%. HAPSOA support a variety of DG placement simulation scenarios involving either heavily or lightly loaded networks by improving the voltage and increasing percentage loss reduction.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Cost indices assessment of road accident on Nigerian federal highways:
           Case study of Ogun State

    • Authors: O. S. Abiola, S. O. Odunfa, O. A. Amoo
      Pages: 508 - 514
      Abstract: Nigeria is currently listed among countries in the world with the highest traffic injuries and fatalities. However, information on road accident costs which is important in the assessment of the National Road Safety Policy of the Country is sparse. This paper attempts to address this draw back through the assessment of cost of road accident on Federal highways in Ogun State based on dominant costs model using human capital approach for different accident severity levels. Road accident data between the period 2010 and 2012 were obtained with indices on human and economic production losses in addition to the direct accident costs (medical costs, claims from insurance company and property damage). The financial loss equivalent value of each of these components were estimated in terms of four types of accident severity namely, property damaged only, slightly injured, seriously injured and fatal. The severity of the fatality and others within the period under review stood at 548, 1934, 2533 and 57, 303, 36 while the total number of road accidents were 291, 754 and 875 respectively. The average traffic accident cost per one dead for 2012 was ₦9,978,577.44 and the cost per fatal was ₦19,957,154.87. The huge economic loss could provide basis for certain measures to be initiated to improve traffic safety level on these highways.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
  • Industrial effluent treatment for sustainable water supply: A case study
           of Savannah sugar company, Numan, Adamawa State, Nigeria

    • Authors: O. M. Oraegbune, S. Ashu
      Pages: 515 - 532
      Abstract: One characteristics peculiar to man is that he progressively changes his environment to meet his biological and social needs. On a social organized basis, man provides himself with the materials necessary for life which he removed initially as raw materials from his environment. By the provision and utilization of these deposited materials, that are worthless and sometimes harmful by-products on the environment, that causes these problems. The aim of this research is to ascertain the environmental problems caused by these discharges and develop or acquire knowledge of the adverse long term effects of untreated or partially treated wastewater containing algae putrients; non-degradable organics and heavy metals which will hasten the deterioration of receiving water bodies. The data for this study were collected through rate of flow of wastewater from various treatment plants. Samples of the generated data were analyzed by the use of the following; Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Suspended Solids (SS), pH and Temperature. The results obtained from the analysis shows that conventional wastewater treatment methods are capable of reducing the Carboceous BOD by more than 90% using a 9 day detention time for the ponds.
      PubDate: 2018-09-03
      Issue No: Vol. 14, No. 3 (2018)
       
 
 
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