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  Subjects -> ENGINEERING (Total: 2287 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (186 journals)
    - ELECTRICAL ENGINEERING (105 journals)
    - ENGINEERING (1206 journals)
    - ENGINEERING MECHANICS AND MATERIALS (385 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (68 journals)
    - MECHANICAL ENGINEERING (90 journals)

ENGINEERING (1206 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: 236)
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 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 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: 30)
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: 15)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
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)
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: 5)
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: 10)
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: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
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: 8)
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: 10)
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: 259)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 182)
Composites Part B : Engineering     Hybrid Journal   (Followers: 236)
Composites Science and Technology     Hybrid Journal   (Followers: 216)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 14)
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: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 58)

        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
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  • Investigating the Suitability of Selected Structural Material for the
           Blade of an Horizontal Axis Wind Turbine

    • Authors: M. Shuwa, G. M. Ngala, A. M. El-jummah
      Pages: 315 - 324
      Abstract: This work presents a comparative analysis on the structural material of a blade used for the horizontal axis wind turbine, which was based on previously developed blade geometry. Two blades of the same parameter: 0.25 m chord lengths at 8 o angle of attack, but different structural materials were compared. This to identify an optimized blade structural material in terms of locally available, strength, cost effectiveness and environmental safety that will be suitable for Maiduguri’s weather condition. The ultimate flap - and edge - wise deflections and load conditions under minimum blade mass (6.8 kg) are determined. These investigations were carried out in two stages: predictions of the aerodynamic analysis using Computational Fluid Dynamics (CFD) code (ANSYS Fluent CFD commercial tool) with Blade Element Momentum (BEM) theory, Finite Element Method (FEM) coded in MATLAB software for the structural analysis and experimental evaluations for the purpose of validation of predicted data obtained. These were employed in order to provide sufficient conclusions of the aerodynamic and structural data that will provide better performance of the blade. These data are expected to handle the design variables meant for the optimization of the blade based on the selected structural material. The blades of each material were divided into 15 elements along the blade span with each element assumed to have uniform cross sectional area. Pressure distribution within the computational domain and around the airfoil section in two dimensions (2D) was predicted. The validated results of the load to deflection showed good agreement and that each of the blade material were based on the structural strength. From the result obtained, it shows that the aluminium blade structure material has good reliability with better performance. These were significant between the maximum strength and the minimum blade mass for aerodynamic loadings, hence better blade structure than that developed from beach wood and most suitable under an ultimate wind speed of 30 m/s.
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Experimental evaluation of coated carbide insert on alloy of steel
           materials during high speed turning process

    • Authors: S. A. Lawal, E. A. Ajani, N. A. Namessan, B. I. Ugheoke, E. A. P. Egbe
      Pages: 325 - 335
      Abstract: The present study investigated the effect of coated carbide turning inserts on the surface roughness of AISI 304L austenitic stainless steel, AISI 316L austenitic stainless steel and AISI 1020 low carbon steel workpiece materials. The three steel grade materials were dry-turned using aluminium oxide (Al2O3) duratomic coated inserts at cutting speeds ranging from 1500 – 2000 rpm (229 – 314 m/min), feed rates of 0.25 – 0.75 mm/rev and depth of cut kept constant at 0.5 mm. Surface roughness values at different cutting conditions were measured and analysed. Chips formed at different cutting parameters were collected, classified according to ISO 3685 standards for chip classification and their surface morphology were analysed using optical microscopy. It was observed that feed rate had the greatest influence on surface roughness for the three workpiece materials. Surface finish deteriorated as feed rate increased. The chips formed were generally of the continuous type with built-up-edges.
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Appraisal of Information Technology Requirements in Quantity Surveying
           Firms in Northern Nigeria

    • Authors: Y. U. Datti
      Pages: 336 - 346
      Abstract: A worrisome trend in the adoption of emerging technologies for competitive advantages and improved productivities by QSs have been observed in that there is overwhelming evidence that there is an increasing usage of IT in quantity surveying firms but little or no noticeable benefits on the practice. It however becomes pertinent to ask then, that despite the increases adoption of computing and telecommunication technologies, why isn’t there any noticeable change due to the impacts of IT in the Nigerian Construction Industry with particular reference to Quantity Surveying practices. The study appraised the requirement of IT in quantity surveying practice in Nigeria. It examined the position of IT in quantity surveying firms in terms of its requirement and analyzed IT requirements-based problem constraining quantity surveying firms. The study is a survey research designed to obtain information on information technology in QS firms. A self-administered questionnaire was employed to quantity surveyors in consulting firms for responses. Responses were returned and analyzed using severity index and later ranked in order of importance. The results indicate a high level of computerization of professional services among the firms with greater number of their computers being networked. However, despite high level of networking of available computers, sharing of printers and other scarce tools/technologies are not established. Compared to developed countries such as Canada, Australia, United Kingdom and USA, the position of IT requirements in QS firms in Nigeria can be said to be at basic level with organization possessing and applying basic IT tools and technologies (e.g. scanners, digital cameras, dvd/cd-rom, general purpose software, QS application software, chat programs etc.) in their daily operation and processes. While most firms are progressing toward intermediate level by possessing intermediate IT tools and technologies (e.g. teleconferencing, DBMS software, mobile data networks, voice output devices etc.) but these technologies are not currently utilized in their operation. Also, advanced technologies (e.g. data conferencing, digital information services, extranet, remote databases, white boarding, voice recognizers etc.) that would make QS firms reap the full benefit of IT and make difference in the industry are hardly available. It is recommended that for the quantity surveying firms in developing countries to maximize their returns on investments on IT, it must go beyond the possession of IT tools to harnessing same to reap the full benefit of technology.
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Design of a Water Supply Distribution Network Using Epanet 2.0: A Case
           Study of Maiduguri Zone 3, Nigeria

    • Authors: A. N. Alkali, S. G. Yadima, B. Usman, U. A. Ibrahim, A. G. Lawan
      Pages: 347 - 355
      Abstract: Maiduguri Water Supply Scheme designed by its consultants in 1983 has divided the town into five water supply distribution zones. Zone 3 is one of three remaining zones in the city without a distribution network supplied from the Maiduguri water treatment plant. Consequently, residents obtain water from local water vendors, who retrieve the water from shallow boreholes which has proven to be tedious, cost ineffective and physically exhausting. A water supply network was proposed with the aid of EPANET software and the results obtained conformed to the design criteria established by the previous designers of the Scheme. A total water demand, projected for the year 2031 of 420LPS, minimum pressure head of 14.08m and maximum velocity of flow in the pipes of 1.24m/s was obtained. The use of EPANET software has proven to be time saving and its application is especially for the analysis of larger distribution networks is recommended. 
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Development of a Model Fire Detection Algorithm

    • Authors: O. S. Ismail, C. I. Chukwuemeka
      Pages: 356 - 366
      Abstract: An adaptive model algorithm for fire (flickering flame, in the infrared region) detection is presented. The model made use of a Pyro-electric infrared sensor (PIR)/Passive Infrared Detector (PID) for infrared fire detection. Sample analog signals (around flame flicker region) were generated and simulated within the framework of the modeled PIR sensor/PID. A Joint Time Frequency Analysis (JTFA) function, specifically the Discrete Wavelet Transform (DWT) was applied to model the Digital Signal Processing (DSP) of the generated signals. It was implemented as wavelet analyzer filters for “fire” and “non-fire” feature extraction. A Piecewise Modified Artificial Neural Network (PMANN) and the Intraclass Correlation Coefficient (ICC) were employed in the decision rule. The PMANN generated polynomials which analyzed and ‘memorized’ the signals from DSP. The ICC further categorized cases as 'fire' or 'non-fire' by comparing data from the PMANN analyzed. The results show that the model algorithm can be implemented in modern day fire detectors and be used to detect industrial hydrocarbon fires with fewer false alarms than smoke detectors or ultraviolet detectors.
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Mechanistic Modeling of Water Replenishment Rate of Zeer Refrigerator

    • Authors: B. N. Nwankwojike, O. S. Onwuka, P. T. Anukam, F. I. Abam, H. N. Chilaka
      Pages: 367 - 377
      Abstract: A model for predicting the water replenishment rate of zeer pot refrigerator was developed in this study using mechanistic modeling approach and evaluated at Obowo, Imo State, Nigeria using six fruits, tomatoes, guava, okra, banana, orange and avocado pear. The developed model confirmed zeer pot water replenishment rate as a function of ambient temperature, relative humidity, wind speed, thermal conductivity of the pot materials and sand, density of air and water vapor, permeability coefficient of clay and heat transfer coefficient of water into air, circumferential length, height of pot, geometrical profile of the pot, heat load of the food preserved, heat flow into the device and gradient at which the pot is placed above ground level. Compared to the conventional approach of water replenishment, performance analysis results revealed 44% to 58% water economy when the zeer pot’s water was replenished based on the model’s prediction; while there was no significant difference in the shelf-life of the fruits preserved with both replenishment methods. Application of the developed water replenishment model facilitates optimal water usage in this system, thereby reducing operational cost of zeer pot refrigerator.  
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Impacts of Catfish Effluents on Water Quality Parameters of Majidun
           Stream, South-West, Nigeria

    • Authors: O. E. Omofunmi, A. F. Adisa, S. O. Alegbeleye, A. O. Oloye
      Pages: 378 - 388
      Abstract: There has been a great concern about the level of safety of surface waters, especially in developing countries where there is an exponential increase in water pollution and water-borne diseases. The aim of this study was to assess the effect of catfish pond effluents on water quality of stream water where five catfish farms were located.  Water samples were taken on monthly basis, 20 cm of below water surface from the streams that receive effluents from neighboring fishponds. Water quality indicators like dissolved oxygen, biochemical oxygen demand (BOD5), nitrate, nitrite, water temperature, ammonia and Hydrogen ion Concentration (pH) were examined in the sampled waters in accordance with the American Public Health Association standards. The average values of water quality indicators examined at effluents and non-effluents discharged sites of the stream indicated that water (24.6 ± 0.2, 24.2 ±0.1), (7.29±0.30, 7.30±0.10), (6.90±0.4, 7.07±0.1 mg/l), (0.40±0.04, 0.27±0.01), (3.77±0.26, 2.34±0.16 mg/l), (3.59±0.11, 2.80±0.02 mg/l) and (3.51±0.24, 2.46±0.21 mg/l) at (p≥0.05) respectively for temperature, pH, dissolved oxygen, total ammonia, total nitrogen, total phosphorus, and BODs. They were significant differences (P 0.05) excepts temperature and pH, between values obtained at effluents discharged and non-effluents discharged sites, indicating that improper discharges of catfish pond effluents could resulted into environmental contamination
      PubDate: 2017-08-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Manipulating E-Mail Server Feedback for Spam Prevention

    • Authors: O. A. Okunade
      Pages: 389 - 397
      Abstract: The cyber criminals who infect machines with bots are not the same as the spammers who rent botnets to distribute their messages. The activities of these spammers account for the majority of spam emails traffic on the internet. Once their botnets and campaigns are identified, it is not enough to keep on filtering the spam emails, it is necessary to deploy techniques that will carry the fight to their end. It is observed that spammers also take into account server feedback (for example to detect and remove non-existent recipients from email address lists). We can take advantage of this observation by returning fake information, thereby poisoning the server feedback on which the spammers rely. The results of this paper show that by sending misleading information to a spammer, it is possible to prevent recipients from receiving subsequent spam emails from that same spammer.
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
  • Evaluation of Constitutive Conditions for Production of Sorghum Stovers
           Briquette

    • Authors: J. O. Olaoye, E. A. Kudabo
      Pages: 398 - 410
      Abstract: Management of biomass waste is one of the problems faced in rural-urban area of developing countries. Engineering properties of biomass materials need to be evaluated in order to have design data for machines required for densification processes. This study was aimed at evaluating the constitutive conditions of densification of Sorghum stover. Selected physical and chemical properties of Sorghum stover were determined and the effects of constitutive conditions (particle size, moisture content, and pre heating temperature) on such parameters as stress at peak, strain at peak and energy at peak of Sorghum stover were studied. Relationship between process variables for densification process for the stover was established. A fabricated densification rig that consisted of a compression cylinder 32 mm diameter and110 mm height, and piston of 32 mm diameter and 250 mm length, was instrumented on a 300 kN UTM (Testometric SF-300-2041) combined with a temperature heating chamber (SIEMENS TLK-96).  A 33 factorial was used to predict the effects of particle size, temperature and moisture content on the densification process for the stover. Data obtained were statistically analyzed using IBM SPSS Statistics 21 software package. Results showed that Sorghum stover bulk density ranged from 170.000 to 170.267 kg/m3 and crude protein was estimated to be 5.03 %.  Constitutive conditions had significant effects on the constitutive parameters at . Linear regression equations were used to predict the responses of the densification parameters. The fabricated densification rig is recommended for the determination of relevant parameters for other biomass materials.
      PubDate: 2017-06-01
      Issue No: Vol. 13, No. 3 (2017)
       
 
 
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