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  Subjects -> ENGINEERING (Total: 2410 journals)
    - CHEMICAL ENGINEERING (206 journals)
    - CIVIL ENGINEERING (201 journals)
    - ELECTRICAL ENGINEERING (112 journals)
    - ENGINEERING (1268 journals)
    - ENGINEERING MECHANICS AND MATERIALS (392 journals)
    - HYDRAULIC ENGINEERING (57 journals)
    - INDUSTRIAL ENGINEERING (78 journals)
    - MECHANICAL ENGINEERING (96 journals)

ENGINEERING (1268 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: 3)
ACS Nano     Hybrid Journal   (Followers: 280)
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: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Journal of Graduate Research     Open Access  
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 3)
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: 27)
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: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 14)
Advances in Polymer Science     Hybrid Journal   (Followers: 44)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 45)
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)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 11)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 24)
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
Annals of Pure and Applied Logic     Open Access   (Followers: 3)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
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: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
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: 5)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
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: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 9)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
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: 1)
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 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: 9)
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: 1)
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: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering     Hybrid Journal   (Followers: 1)
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: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
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: 4)
BioNanoMaterials     Open Access   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 40)
Bitlis Eren University Journal of Science and Technology     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 et Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 43)
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: 7)
Catalysis Science and Technology     Free   (Followers: 8)
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: 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: 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: 22)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Hybrid Journal   (Followers: 9)
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: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
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 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: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 286)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 219)
Composites Part B : Engineering     Hybrid Journal   (Followers: 253)
Composites Science and Technology     Hybrid Journal   (Followers: 197)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 16)
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: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 7)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 34)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)

        1 2 3 4 5 6 7 | Last

Journal Cover
American Journal of Environmental Engineering
Number of Followers: 16  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2166-4633 - ISSN (Online) 2166-465X
Published by SAP Homepage  [105 journals]
  • Modelling Contaminant Dispersion in Meandering Low Wind Conditions
           Employing Meteorological Models

    • Abstract: Publication year: 2018Source: American Journal of Environmental Engineering, Volume 8, Number 2Viliam Cardoso da Silveira, Gervásio Annes Degrazia, Daniela Buske, Silvia Beatriz Alves RolimThe aim of this work is evaluating the behaviour of the pollutant plume in the region where the INEL (USA) experiment was released. The INEL diffusion experiment consists of a test series that was accomplished in a flat and uniform terrain under stable low wind atmospheric conditions. Thusly, accounting for the current understanding of the stable planetary boundary layer (PBL) turbulence pattern and characteristics (stable eddy diffusivities), a modelling system consisting of the WRF (Weather Research and Forecasting) and LES-PALM (Large-Eddy Simulation-Parallelized) model is employed to describe the dispersive effects associated with the wind meandering movements. The potential temperature profiles and heat fluxes generated by the WRF model will be used as initial conditions to the LES-PALM model. PALM is referred as a model to Large Eddy Simulation (LES) to atmospheric and oceanic fluxes that is destined to parallel computer architectures. The horizontal wind meandering generated by LES-PALM model will be used as initial conditions to the dispersion model based in the 3D-GILTT (3D Generalized Integral Laplace Transform Technique) technique that analytically solves the advection-diffusion equation. This technique of the integral transform combines a series expansion with an integration. In the expansion a trigonometric base, determined from the Sturm-Liouville auxiliary problem, is employed. The integration is made in all range of the transformed variable, making use of the orthogonality property of the base used in the expansion. The resultant ordinary differential equations system is analytically solved using the Laplace transform and diagonalization. The simulation results, generated from this modelling system are show to agree with the observed ground-level centreline concentrations of INEL experiments and also with those of other atmospheric dispersion models. The present study shows that the horizontal wind field provided by the coupling of two meteorological models (WRF and LES-PALM) can be used in a Eulerian diffusion model to properly simulate meandering enhanced dispersion of contaminants in a low wind speed stable PBL.
       
  • Combined Clay Adsorption-Coagulation Process for the Removal of Some Heavy
           Metals from Water and Wastewater

    • Abstract: Publication year: 2018Source: American Journal of Environmental Engineering, Volume 8, Number 2Ababu T. Tiruneh, Tesfamariam Y. Debessai, Gabriel C. Bwembya, Stanley J. NkambuleHeavy metals pollutions from wastewater discharges present an increasing concern for health, eco-system and the environment due to their persistence and bio accumulation via the food chain. Heavy metals in excess concentration cause problems of toxicity and growth inhibition to living things. While the cation exchange capacity of clay with respect to heavy metal removal is well documented, a two-step clay-coagulation combined process is studied in this research in which an excess clay addition in powder form to wastewater is followed by coagulation with aluminum sulphate to further remove heavy metal by synergy with the clay adsorption and to settle the clay adsorbent through flocculation and settlement. High percentage removal of heavy metals ranging from 96-99% has been observed. The saturated adsorption is adequately modelled by Freundlich as well as Langmuir isotherm models for the excess clay range studied. The clay-coagulation combined treatment technology can also be adapted to heavy metal removal in water treatment applications in which coagulation is often used for the removal of the colloidal portion of suspended solids.
       
  • Pathogens Removal from Wastewater Using Sustainable Treatment Wetlands in
           Tanzania: A Review

    • Abstract: Publication year: 2018Source: American Journal of Environmental Engineering, Volume 8, Number 2Wajihu Ahmada, Jamidu H. Y. Katima, Richard Kimwaga, Rob Van DeunMunicipal and domestic wastewater contains various pathogenic micro-organisms which, depending on their concentration pose a risk to human health. Therefore their presence must be reduced or eliminated before treated wastewater is reused or released into the environment. Studies conducted by researchers suggest that treatment wetlands are the best systems in removing pathogens from wastewater. Further, the literature reveals that some of the treatment wetland systems achieved up to 2 – 4 log10 removal efficiencies. Effective removal of pathogens in treatment wetland systems calls for an understanding of the processes responsible for pathogen removal. One way of understanding these processes is through the use of mathematical model equation. However, in the case of Horizontal Subsurface Flow (HSSF) constructed wetlands, there is no apparent mathematical model equation explaining pathogens removal processes. On the other hand, treatment wetland systems in Tanzania fail to remove pathogens as intended by designers probably and partly due to improper operation and poor maintenance. This article presents the review of treatment wetland performances in removing pathogens in Tanzania conducted in prior studies. It is also geared toward understanding the removal mechanisms responsible for pathogens removal in these treatment systems.
       
  • Radionuclide Adsorption Performance in Cement and Soil Medium for Safety
           Issue of Radioactive Waste Disposal Facility

    • Abstract: Publication year: 2018Source: American Journal of Environmental Engineering, Volume 8, Number 1M. Shamsuzzaman, Antu Biswas, Md. Mosharraf Hossain Bhuiyan, Md. Abu Haydar, Debasish Paul, Md. Jafor Dewan, Md. Shafiqul IslamRadionuclide migration from a disposal facility is one of the most crucial factors for protecting man and environment. To ensure safety of a disposal facility, radionuclide migration or adsorption behavior is a key issue in operational and post operational phase. In this perspective, laboratory based column experiments was carried out to investigate theadsorption behavior of radionuclide on the cement and soil mediums. Present experiments simulate the migration behavior of radionuclide through the cement and soil barrier into the environment if the waste packs inside a disposal site encounter rain infiltration. In this study, some simulant cement chunk was produced with a water-cement ratio of 0.50 each, and soil samples were prepared with various grain sizes from 90 µm to 2 mm. In this study adsorption and hence migration behavior of solid spent resin was verified experimentally. In addition, adsorption of two radionuclides, namely 60Co and 137Cs was investigated as liquid waste by using the gamma spectrometry analysis. The highest activity distribution of 60Co at 1173.2 keV and 137Cs was found in concrete medium 53.49%, and 46.82 in the soil medium, respectively. Thus, locally prepared multiple barriers of cement and soil medium could reasonably be suitable for liquid waste immobilization.
       
  • Electronic Waste Management Approaches, Saudi Arabia

    • Abstract: Publication year: 2018Source: American Journal of Environmental Engineering, Volume 8, Number 1Bader A. HakamiElectronic waste is growing at a fast pace with emerging problems of pollution across the world. The increasing presence of toxic substances damages the environment and affects the health of human beings in case of unmanaged disposal protocols. This study demonstrates the overview of toxic substances in electronic waste, potential impacts of waste on the environment and its impacts on human health. Additionally, it presents possible electronic waste management strategies. There are different tools to deal with e-waste, such as material flow analysis, extended producer responsibility, life cycle assessment and multi-criteria analysis for managing e-waste. The major keys to success for electronic waste is to utilize eco-design devices, collection of e-waste in proper manner and recycle the material safely. It also includes, disposal of waste with suitable technique, raising awareness of negative impact of electronic waste and forbidding the transfer of electronic devices. The study indicates that there is not any single tool for management of e-waste but complementary strategies can solve the issues in best possible manner. Furthermore, the efficient policies of extended producer responsibility are quite feasible for solving the problems of electronic waste up to maximum potential.
       
  • Investigating the Levels of Ammonia and Nitrates in Dillon Lake and Their
           Effects on the Environment

    • Abstract: Publication year: 2018Source: American Journal of Environmental Engineering, Volume 8, Number 1Shadi Abu-Baker, Christopher Russell, Joshua DoudnaIt’s a well-known fact that groundwater contamination is a problem in freshwater lakes. Ammonia and nitrates are two of these contaminants, which can cause the premature aging of the lakes and deoxygenation by causing algae to grow out of control. Our goal in this experiment is to determine the levels of ammonia and nitrates in Dillon Lake and their effects on the environment. With this information, we hope to find a way to reverse some of the damage to the lake's ecosystem and raise awareness about this issue. We also hope to connect it to the larger problems in this area. Based on our results, the nitrate and ammonium levels are mostly within the acceptable limits. However, in some areas the nitrate values are high enough to cause spots of excessive algal buildup around the Lake.
       
  • Remedies of Textile Dyeing Effluent by Adsorbents Produced from Indigenous
           Agricultural Waste Products

    • Abstract: Publication year: 2017Source: American Journal of Environmental Engineering, Volume 7, Number 5Md. Azharul Hossain, Shohel Ahmed, Jamal Haider Hasib, Ashique Ul Haque, Rajon Ahmed, Santanu DasAdsorption is typically used in wastewater treatment to remove toxic or recalcitrant organic pollutant (specially Halogenated but also non halogenated) and to a lesser extent, inorganic contaminants, from the waste water. It finds applications in tertiary wastewater treatment as a polishing step before final discharge. In this study three types of adsorbent were used for removal of color from textile dyeing effluent.
       
  • Detection of Drought Cycles Pattern in Two Countries (Sudan and South
           Sudan) by Using Standardized Precipitation Index SPI

    • Abstract: Publication year: 2017Source: American Journal of Environmental Engineering, Volume 7, Number 4Yousif Elnour Yagoub, Zhongqin Li, Omer Said Musa, Muhammad Naveed Anjum, Feiteng Wang, Zhang BoThe aim of this research was to investigate the drought cycles in two countries (Sudan and South Sudan) by using characteristics of Standardized Precipitation Index (SPI) during 1961-2013 to provide valuable information for better adaptation and mitigation of consequences of drought to create a strategically good planning. This study compared the effectiveness of SPI on a long-term scale of (1, 3, 12, 24, 36 and 48 months lead time) drought conditions. The SPI 12-month showed high frequency of droughts in 1966 - 1968, 1974, 1984 - 1985, 1991 - 1992, 2000 - 2003, 2005 - 2006 and 2010. A high frequency of an annual-SPI mild drought was found in: Portsudan, Dongala, Shendi, Khartoum, Alfashir, Geneina, Malakal, Juba and Wau; moderate drought in: Portsudan, Halfawadi, Karrima, Abuhamed, Atbara, Gadarif and Edduim; severe drought in: Aroma, Kassala, Wadmedani, Edduim, Elobeid, Zalingei and Geneina; and extreme drought in: Gadarif, Singa, Abunama, Edduim, Elobeid, Alfashir and Zalingei. Increasing trend of drought, which was associated with the decreasing tendency of precipitation, would reduce the natural vegetation and crop covers as well as livestock production. In fact, this research has revealed that ongoing droughts caused by a decrease in precipitation would eventually reduce the natural vegetation cover, croplands, and livestock production.
       
  • Geospatial Analysis of the Impact of Urban Built-up Development on the
           Distribution of Suitable Solid Waste Dumpsites in Ile-Ife, Nigeria

    • Abstract: Publication year: 2017Source: American Journal of Environmental Engineering, Volume 7, Number 4Eneche Patrick Samson Udama, Nwosu Eberechi Ethel, Abu Hassan OnimisiThe implication of rapid urban built-up development on the siting of suitable solid waste dumpsites in Ile-Ife forms the major thrust of this paper. This study made use of different parameters to identify suitable solid waste dumpsites in Ile-Ife for 2008 and 2013 and determined the spatial growth of urban built-up development for the same epoch. Landsat ETM+ imageries for 2008 and 2013, Google Earth Pro Scenes, ASTER GDEM elevation data, as well as geologic and soil maps were obtained and analysed in. Erdas Imagine 9.2, ArcGIS 10.5 and Minitab 17.0 environments. Classification and extraction of geospatial data earmarked for the study, including road, water body, soil, underlying geology and slope were performed with the aid of simple model builders, Multi-Criteria Evaluation (MCE) analysis and Chi-square statistic. The result revealed that Ile-Ife town had a frequency of change in urban built-up area of about 1.91sq.km per year and experienced a reduction of moderately and highly suitable solid waste dumpsites and an increase in unsuitable ones. The Chi-square result (P-value = 0.006; -level of 0.05) revealed a significant difference in dumpsites suitability categories for the period under investigation. It was therefore concluded that in view of sustainable urban development, there is need for restrictions to be given for urban built-up development as it affects the limited areas suitable for waste disposal in Ile-Ife. The study also proved the flexibility of smart geospatial techniques (by which future scenarios can be predicted or simulated), thus recommended for environmental managers and urban planners.
       
  • Modeling and Optimization of Structural Steel Corrosion Inhibition using
           Barely Grass Extract as Green Inhibitor

    • Abstract: Publication year: 2017Source: American Journal of Environmental Engineering, Volume 7, Number 4Ammar Ali, Sarah Falih, Nedal Yousif, Reben Rezgar, Ibtisam KamalThe work deals with studying the corrosion inhibition of structural steel in acidic medium (0.1M HCl) using barley grass extract as inhibitor. The effect of the concentration of inhibitor (432-768) ppm, time (15.3-176.7) h, and temperature (24-44)°C on corrosion rate, inhibition efficiency and degree of surface coverage of the metal alloy was investigated using Response Surface Methodology (RSM). Fitting of degree of surface coverage with Freundlich adsorption isotherm was conducted. The kinetics parameters of corrosion and inhibition processes including the activation energy and frequency factor were estimated as well as the thermodynamic parameters including the standard free energy of adsorption Δ G°ads, the entropy of activation (ΔS*) and enthalpy of activation (ΔH*). The corrosion rate was found to increase with increasing time and temperature, while the inhibition efficiency was found to increase with increasing the inhibitor concentration and decrease with time and temperature. The RSM analysis results revealed that maximum corrosion rate of about 2.11 mg/h resulted at 42°C and 164 h without using inhibitor compared to 0.26 mg/h at 43°C and 72 h with using the green inhibitor respectively. The value and the negative sign of ΔG°ads indicated that the inhibitor molecules adsorbed spontaneously onto the metal surface via physiosorption. The positive shift of enthalpy of activation in presence of inhibitor reflected that the process of adsorption of the inhibitor on the alloy surface is an endothermic process and the negative values of entropy of activation represented association rather than dissociation of the inhibitor indicating the decrease of system disorder due the adsorption process. According to the estimated results, barely grass extract could be recommended as low cost green inhibitor for acid corrosion inhibition of structural steel used in manufacturing industrial equipment and vessels.
       
 
 
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