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Application of Geophysical Methods to Building Foundation Studies

International Journal of Geosciences 2013年第9期4卷 1256-1266页

作者： Folahan Peter Ibitoye Felix Vincent Ipinmoroti Mudasiru Salami Kunle Joseph Akinluwade Adeyinka Taofeek Taiwo adelana rasaki adetunji 1Department of Applied Geophysics Federal University of Technology Akure Nigeria 2Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria 1Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria 2Department of Materials Science and Engineering African University of Science and Technology (AUST) Abuja Nigeria 1Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria 2Department of Materials Science and Engineering Obafemi Awolowo University Ile-Ife Nigeria Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) Ilesa Nigeria

A geophysical survey involving the electrical resistivity method utilizing the Vertical Electrical Sounding (VES) and Electrical Imaging Techniques was conducted around the premises of an area within south-western Nigeria with the aim of studying structural defects which may be responsible for future problems and characterizing the soil conditions of the site. A total of 15 VES stations were occupied using Schlumberger Configuration with AB/2 varying from 1 to 65 m. In the electrical imaging, dipole-dipole array was adopted and the two traverses were occupied in the S-N and E-W directions close to where wall cracks and subsurface problems were manifested. Five main geoelectric sequences were delineated within the study area;these include the topsoil (clay and sandy clay), lateritic clay, weathered bedrock (clay, sandy clay and clayey sand), fractured bedrock and fresh basement. A major discontinuity (fracture zone) was discovered along the S-N direction, while a weak zone was also discovered along E-W direction. The result of this research has shown that the causes of the cracks and distress on the walls within the site may have been influenced by the differential settlement resulting from the incompetent subsoil materials and the fractured bedrock on which the foundation of the building was laid.

关键词： Foundation Bedrock Basement Cracks Subsurface Instability

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Numerical Optimization of Sand Casting Parameters Using the Dantzig’s Simplex Method

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Journal of Minerals and Materials Characterization and Engineering 2013年第5期1卷 250-256页

作者： John Ogheneortega Oji Simon Godenaan Datau Kunle Joseph Akinluwade Adeyinka Taofeek Taiwo Dayo Adeyemi Isadare Sunday Hendrix Pamtoks adelana rasaki adetunji Department of Materials Science & Engineering Obafemi Awolowo University Ile-Ife Nigeria Department of Materials Science and Engineering African University of Science and Technology Abuja Nigeria Department of Mechanical Engineering Federal Polytechnic Bauchi Nigeria Prototype Engineering Development Institute (PEDI) Ilesa Nigeria

This study adopts the Dantzig’s Simplex method to investigate optimization of sand casting parameters for optimum service performance. Some process variables and mechanical properties were adapted into the Simplex method. Aluminium alloy samples were cast, machined and subjected to a series of mechanical tests. From the body of data collected, linear functions and constraint equations were formulated and employed in the Dantzig’s Simplex method for optimization of process parameters. The results showed that the Simplex method can be adapted for studying performance opti- mization of castings.

关键词： Sand Casting Dantzig’s Simplex Method Optimization Constraint Equations Aluminium Alloy

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Development of Computer Software for Evaluating Performance Index of Fairly Used Vehicle Engines

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材料科学与工程（中英文A版） 2014年第7期4卷 249-254页

作者： Morufu Oyekola Oduola Kayode Oke Kunle Joseph Akinluwade adelana rasaki adetunji Department of Engineering Prototype Engineering Development Institute llesa Nigeria Department of Mechanical Engineering Federal University of Technology Akure (FUTA) Akure Nigeria

The introduction of Structural Adjustment Programme (SAP) in 1984 to tackle economic challenges marked the entry of used vehicles which are imported mainly from Europe and America into the road transportation system of Nigeria. However, many problems, ranging from pollution and degradation of environment to personal inconveniencies to owners/users of these used vehicles due to frequent breakdown, have been identified with these vehicles. Sequel to this, software was designed with graphical user interface (GUI) for evaluating performance index of cars being imported into the country as a way of solving the problems earlier identified. The software was validated using data obtained from 1990 Nissan Primera vehicle model. The result from the validation gave the performance index value of 8.8019 × 10-29 for the vehicle used. This implies that the reliability of this vehicle model is almost nil after twenty years of usage.

关键词：计算机软件性能指标二手车评价发动机图形用户界面道路运输系统 TIFF格式

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Light and Electron Microscopy Studies of the Visible Diffusion Zone of Mild Steel Pack Cyanided in Processed Cassava Leaves

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材料科学与工程（中英文B版） 2013年第9期3卷 567-570页

作者： Akinluwade Kunle Joseph adelana rasaki adetunji Mosobalaje Adeoye Lasisi Ejibunu Umoru Adeyinka Taofeek Taiwo Peter Kalu Azeez Rommly Dayo Adeyemi Isadare Winston Wole Soboyejo Olusegun Oyeleke Adewoye Prototype Engineering Development Institute National Agency for Science and Engineering Infrastructure (NASENI) llesa233036 Nigeria Department of Materials Science and Engineering African University of Science and Technology Abuja 900108 Nigeria Department of Chemical Materials and Biomolecular Engineering University of Connecticut Farmington CT 06032 USA Department of Materials Science and Engineering Obafemi Awolowo University lle-lfe 220282 Nigeria Department of Mechanical Engineering Florida Agricultural and Mechanical Engineering University Florida 34420 USA

This study investigates the microstructure of the visible diffusion zone formed in low carbon steel pack cyanided using processed cassava leaves. Standard parts machined from low carbon steel were pack cyanided by high temperature in-situ diffusion of nascent carbon and nitrogen into austenite. Formation of a visible diffusion zone was confirmed after observation with a Reichert-Jung Polyval optical microscope coupled with Zeiss AxioCam ICc 1 camera. High magnification Scanning Electron Microscope (SEM) imaging of the visible diffusion zone was done with a CamScan Series 2 scanning electron microscope. The zone was found variable in depth as measured from a representative position. The structure of all samples consists of ferrite and pearlite as determined by optical and SEM examination. Resulting products were thus both tough and hard suitable for service environments requiring high resistance to both wear and impact failure.

关键词：扫描电子显微镜光学显微镜木薯叶扩散加工氰化低碳钢包

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