bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of Daylighting Designs in the Selected Museums of South-West Nigeria: A Focus on The Integrated Relevant Energy Efficiency Features
Authors: Aderonmu P , Adesipo A , Erebor E , Adeniji A , Ediae O 
Published: November 2019

Abstract
An examination of the integrated relevant energy efficiency features is emergent to proffer amicable solutions into some tropical buildings and energy issues. This would go a long way to determine the registered thermal comfort levels enjoyable by the users, occupants and dwellers of such buildings. In this regard, great accountability is required on the part of the stakeholders, especially the Architect-designers. This study investigated the daylighting features engaged in the selected museums of South-western states in Nigeria. The integration of natural daylighting into museums spaces is a major factor in determining the positioning and sizing of fenestrations to the interior spaces of most buildings. Especially in Museum building designs where the artefacts are supposedly not to be exposed to the direct rays of the sun. The effects of daylighting exposure to the museum artefacts depends greatly on the length of exposure to light rays and object tolerance. The aim of this project is to carry out an assessment of daylighting designs in the Selected Museums of South-West Nigeria in order to integrate relevant energy efficiency features into the architectural designs. The study methodology engaged questionnaires, interview and literature reviews in order to have an understanding of the daylighting features integrated into Museum buildings. It also examined the relevant energy-design features for integrating daylighting strategies into the Museum designs. Questionnaires were administered and analysed using Statistical Package for Social Science (SPSS) through descriptive analysis of the data. The analysis showed that there are parametric-energy design indices in the existing architectural designs that are applicable in forms, spaces, materials, techniques, installation and strategies to museums in the tropical climatic regions. The analysis further showed that the use of domes, clerestory windows, atriums, light tubes and anti-solar glass/windows were considered to be most adequate daylighting features sufficient for daylighting designs and energy efficiency optimization. This study developed an architectural design model of a museum as a canonized exemplar that explores various strategies and techniques on how daylighting can be achieved in the museum spaces. It finally recommended an architectural model design specific to all tropical building species in a holistic form and spaces, and planning. These would enable a high-level patronage and optimization for entrepreneurial benefits within the confine of museums and other culture-related buildings in the tropical climate.
Use of Non-Destructive Tests for Reinforced Concrete Damage Assessment
Authors: Thomas H , Ede A 
Published: November 2019

Abstract
Worldwide, the debilitation of structures over the last few decades has been a cause for concern. This has led to the need to create awareness among engineers, and home owners about the different ways in which a structure can be checked for structural safety. To assess the behavior of new and existing buildings to varying loads over time, numerous methods have been developed and a major breakthrough for concrete and steel structures is the introduction of Non-destructive tests. This project was aimed at highlighting the common methods while also giving an in-depth investigation into the use of Non-destructive tests in Nigeria as well as their efficiency in the determination of building properties. The widely used methods in Nigeria includes: Schmidt hammer test, Ultrasonic pulse velocity test and the Rebar locator test and the properties the tests considered include: strength, surface hardness, homogeneity, reinforcement location and bar size. After successful execution of the tests, it was discovered that the Schmidt hammer is capable of giving an estimate of concrete strength not too far from the strength obtained from carrying out destructive tests on the same sample. From the pulse velocity test, it was observed that the method is not a reliable test of strength but rather, a determinant for uniformity and homogeneity in the tested samples. Thus, it can be concluded that in carrying out assessments of structures, the Schmidt hammer, ultrasonic velocity tester and the rebar locator should simultaneously be used to give a proper assessment on the structural integrity of structures.
Impact of activated–flux tungsten inert gas (a-tig) welding on weld joint of a metal – Review
Authors: Afolalu S A , Soetan S B , Ongbali S O , Abioye A A , Oni A S 
Published: November 2019

Abstract
Welding is applied in every industry and it’s a major method of manufacturing and revamping metal products because its generally economical, efficient and reliable as a means of joining together metals. Various ways have been proposed to improve the process ranging from adjusting the various welding parameters like welding current, voltage, arc length, width, type of shielding gas used, to using arc pulsing. The method that has however gained the most attention is the Activated-flux TIG welding process which utilizes welding flux to help reduce the bead width and increase the weld penetration. In order to improve the TIG welding process’s industrial efficiency and penetration ability, one method commonly applied is the use of activating flux with the welding process. This review provides insight to the impact of Activated - Flux Tungsten Inert Gas Welding on weld joint of a materials metal.
Microstructural and Mechanical Properties of Welded Joints in Tig, Mig and Friction Stir Welding –Review
Authors: Afolalu S A , Ohwofa A O , Ongbali S O , Ajayi O O , Abioye A A 
Published: November 2019

Abstract
In the manufacturing industry today, welding is a very important process needed for fabrications and revamping metal products. Researchers continually look for the best types of welding to be used for various joints. A lot of experiments had been carried out varying welding parameters and studying its effects. This paper basically reviews the residual stress effects on the welded joints of Steel, Magnesium and Aluminium alloy with their experimental analysis. The performances comparison of TIG, MIG and Friction Stir welding were also considered through check of their microstructure, mechanical property, young modulus, stress and yield stress of their welded joints. This has been able to show different behavious resulted from various welding mode of a welded joint.
Geotechnical characteristics of a selected shallow marine area considered for quay wall construction
Authors: Ogunwole D A , Akinwumi I I 
Published: November 2019

Abstract
Quay wall defense systems are useful marine structures for berthing of vessels and other marine operations. Before quay-walls are constructed in shallow marine areas, there is need for adequate subsurface investigation to ensure proper design and construction of quay-walls that will be able to satisfactorily support the facilities they are intended for. This research work focuses on subsurface investigation involving the geotechnical characterization of soil in a selected shallow marine area in the Niger Delta area of Nigeria. Percussion rigs were used for both the on-land and over-the-water borings. A total of seven (7) on-land and six (6) over-the-water borings, all to a depth of 40 m each below existing ground level and sea bed respectively, were carried out. Field and laboratory tests were performed in order to effectively characterize the soils. Stratigraphy of on-land borings showed soft fibrous organic peaty clay layer, underlain below by silty sands and clays. Beneath this layer to the end of boring is well-graded sands and gravels. The borings over-water had a very soft to soft clay layer underlain by silty-sand, being underlain by poorly-graded sands and well-graded sands to the limits of the borings. Deep foundation systems employing reinforced concrete piles to depths (coinciding with the sandy horizon) were recommended for the on-land piles, reinforced hollow cylindrical steel piles for piers and piles for offshore landing jetties, and concrete sheet piles for shore protection works. This will form the ballasts for mooring of cargo vessels for conveying oil and gas final products.
Stabilization of lateritic soil with cement – oil palm empty fruit bunch ash blend for California bearing ratio base course requirement
Authors: Komolafe O O , Osinubi K J 
Published: November 2019

Abstract
Lateritic soil obtained from a borrow pit at Maya Aladiye, Ijebu – Itokin Road, Ikorodu Local Government Area in Lagos state was classified as an A-6(8) using the American Association of State Highway and Transportation Officials (AASHTO) soil classification system or CL using the Unified Soil Classification System (USCS). It was treated with cement – oil palm empty fruit bunch ash (OPEFBA) blend in stepped concentrations of 0, 2, 4, 6 and 8 % cement as well as 0, 2, 4, 6 and 8 % of OPEFBA, respectively, by weight of dry soil. Index, cation exchange capacity (CEC), compaction and California bearing ratio (CBR) laboratory tests were carried out on the natural and treated soil specimens. Compaction was done using three different effort levels namely, the British Standard light (BSL), West African Standard (WAS) and the British Standard heavy (BSH). The 2-day CBR values (soaked) of the natural soil for the BSL, WAS and BSH compaction efforts increased from 10, 6 and 8 % to 105, 120 and 110 %, respectively, at an optimum 8 % Cement / 2 % OPEFBA treatment. These CBR values met the 80 % requirement for base course materials with a beneficial environmental advantage of utilizing a palm oil mill waste.
Comparative analysis of microbial loads of molecular potential chain disintegrator (MPCD) and potassium permanganate (PP) in remediation of hydrocarbon contaminated soil/groundwater in three dimensional (3D) laboratory sand tank model
Authors: Fadugba O G , Olukunle O F , Ola S A , Ojuri O O 
Published: November 2019

Abstract
This paper evaluates the comparative analysis of bacterial loads of molecular potential chain disintegrator (MPCD) and potassium permanganate (PP) in remediation of artificial hydrocarbon contaminated soil and groundwater in 3D laboratory sand tank. Alluvial sand was packed in the sand tank model, and 20 cm chamber was packed with prepared artificial diesel contaminated soil. Free flow of water was allowed through the soil medium from the inlet chamber which was being fed continuously from the storage elevated tank with the discharge port opened at flow rate of 58 ml/min. The remediating agents (MPCD and PP) were prepared differently and introduced through the injection wells (IW) to the sand medium at different experimental design stages. Microbial analysis was carried using standard techniques. The microbial loads of unpolluted soil samples collected from the sand tank model was 3.5 x 104 ± 1.5 Cfu/g while the oil-degraders from the diesel contaminated soil was 9.5 x 104 ± 2 Cfu/g. It could be observed that the population of oil-degraders in the MPCD amended soils and water decreased gradually during the incubation period of 15 days from 36 x 104 ± 4 Cfu/g on day 0 to 12.5 x 104 ± 3.5 Cfu/g for soil samples and from 58.5 x 102 ± 1.35 Cfu/mL to 17.5 x 102 ± 0.5 Cfu/mL for water samples. The decrease in the population of oil-degraders could be attributed to the reduction in the concentration of diesel in the soil and water samples undergoing bioremediation. The composition of the two nutrients (MPCD and PP) can be responsible for the ability of the nutrients to enhance the degradation process.
Failure Trend of Transport Infrastructure in Developing Nations: Cases of Bridge Collapse in Nigeria
Authors: Ede A , Nwankwo C , Oyebisi S , Olofinnade O , Okeke A , Busari A 
Published: November 2019

Abstract
Sustainable transport system must be supported by resilient infrastructure such as bridges. Bridge is an essential transportation structure that offers unique solutions for road and rail traffic to cross rivers, gorges and difficult ground conditions or for reducing conflict points in transportation system by carrying one mode of traffic over the other. Due to its pronounced economic importance to the society, bridge design aspects must go beyond the physical bridge structures and must cover all the factors that impact on the safe operation throughout its serviceable life span. The environment and the obstacle it crosses, the soil which carries it, the self-weight, imposed dead weights and the moving live loads must be adequately taken care of. The considerable conflicting factors of the site’s soil characteristics, river hydrology, ecosystem environmental impact, aesthetics, historical and archaeological impacts, permanent and transient loads, construction technologies and construction materials bring together a vast expertise of professionals. These sizeable factors must be well managed and harnessed by the vast team of experts involved to guarantee a positive outcome. The vast decay of Nigerian transport system is visible in all complimenting infrastructure including bridges. Cases of bridge collapse abound in Nigeria within the last decade. This research studies the failure trends of bridges in Nigeria and forty-five documented cases are considered for the research. Structural health monitoring approaches were combined with statistical measures to assess the causes and to proffer solutions to the failure trend. Poor maintenance, torrential rainfall/flooding, terrorist attacks, faulty design, poor materials and construction quality and truck overloading were found to be the major causes of bridge failures in Nigeria.
Mechanisms of riverbank failure and channel instability on the Nkisi River, Southeast Nigeria
Authors: Okeke C A U , Ede A N 
Published: November 2019

Abstract
Sedimentation hazards pose several geoenvironmental problems in active alpine regions and fluvio-deltaic environments. Therefore, this research seeks quantitative knowledge of the mechanisms that trigger riverbank erosion which result in high volumes of sediment yield in the downstream reaches of the Nkisi River. Study of the mechanisms of mass wasting of the riverbanks was motivated by the high rate of siltation and accretion that are currently occurring at the mouth of the Nkisi River, occupying a total surface area of about 40,000 m2. Many riverbank stability and erosion assessment studies have been done using a wide range of geomorphometric and geotechnical analyses which consider the shear strength of the bank materials in relation to the geomorphometric characteristics of the riverbanks. With this insight, this research focuses on investigating the potential causes of riverbank retreat on the river, with particular interest on the effects of soil properties in triggering mass failures. Field surveys and laboratory investigations, coupled with Bank Erosion Hazard Index (BEHI) and Bank Stability and Toe Erosion Model (BSTEM) characterized the riverbanks as unstable and conditionally stable, revealing a potentially high rate of sediment loading from the composite banks, with a factor of safety that varies from 0.76 to 1.04.
Analysis of Euler beam and bar as negative stiffness mechanism in vibrating structures
Authors: Oyelade A O , Sadiq O M 
Published: November 2019

Abstract
Presented here is a new mechanism based on a combination of a bar and Euler beam to illicit negative stiffness in structures. The proposed mechanism consists of an inclined bar, a horizontal Euler beam. The characteristics of the negative stiffness model is presented, and its dynamic features in combination with a vertical spring and damper is investigated under displacement vibration. It was discovered that the design of the mechanical isolator provided a better performance at zero dynamic stiffness during vibration than that of the linear isolator. The proposed mechanism can provide an alternative means of generating negative stiffness within structures.
Safety issues caused by human factors in the Nigerian telecommunication industry
Authors: Kukoyi O , Aigbavboa C 
Published: November 2019

Abstract
Safety is one of the foremost objectives and standard of any organization or industry in any country or nation, hence as such there is an inherent need to understudy how human factors have led to safety issues in the Nigerian Telecommunication industry today. Based on this knowledge this study will take an exploratory review into ways of preventing safety issues caused by human factors in the Nigerian telecommunication industry and find ways of reducing such occurrences to the barest minimum. This study will be conducted using relevant literature reviews from databases such as Scopus, Science direct, Taylor and Francis online and not to mention a few more. Findings from this study will aid the Nigerian Telecommunication industry by providing deep and valuable insight to ways of preventing avoidable safety issues related or caused by human factors. This study will also aid by adding to the body of knowledge on safety issues in organizations and industry across the African continent.
Frobenius method for the solution of Klein-Gordon-Fock equation with equal scalar and vector oscillator plus potential
Authors: Anake T A , Edeki S O , Oghonyon J G , Ogundile O P 
Published: November 2019

Abstract
In this paper, the solution of Klein Gordon Equation is sought. Frobenius method was used to solve the Klein Gordon (KG) equation with equal scalar and vector harmonic oscillator plus inverse quadratic potential for s - waves. A corresponding un-normalized wavefunction was obtained for the Frobenius equation in the form of a power series.
Ergodic and non-ergodic variogram uncertainty in Agbabu bitumen field porosity data
Authors: Mosobalaje O O , Ajia M V , Orodu O D , Ogbe D O 
Published: November 2019

Abstract
A recent investigation estimated and modeled the variogram of the porosity attribute of the bitumen field located at Agbabu, south-west Nigeria. In spite of methodological interventions made during the estimation, the variogram estimates obtained are still uncertain due to preferential and limited sample data. This current research therefore assesses the uncertainty in the ergodic and non-ergodic variogram estimates. Multiple samples required for ergodic and non-ergodic variogram estimates have been drawn from simulated realizations of the porosity random field. Variogram estimates have been obtained (using a recently-formulated lag-cluster technique and conventional technique) for each sample. The sampling distributions of these estimates have been examined with histograms and Normal Q-Q plots. The estimates exhibit approximately Normal distributions. The uncertainty in the ergodic variogram increases from 1.4×10−7 at lag 16.7 m to 4.6×10−7 at lag 4601.4 m; thereafter, it appears to flatten out. For most lag distances, the uncertainty in the non-ergodic variogram is constant at about 1.8×10−7; it fluctuates at large lag distances. The uncertainty in non-ergodic estimates is observed to be lower than the uncertainty in ergodic estimates. Consequently, that the current well spacing and distribution in Agbabu field is deemed adequate in the context of variogram estimation.
Sales and supply chain risks mitigation: a study of some companies at the peak of Boko Haram insurgency in North East, Nigeria
Authors: Aigbavboa S , Ojadi F 
Published: November 2019

Abstract
This paper discusses the risk mitigation strategies of some Nigerian companies that make and/or import and distribute their products in the North Eastern part of the country where the Boko Haram (BH) religious insurgency has been very active. The aim of the study is to understand how some of the affected companies adopted mitigating strategies to remain resilient in the region during the peak of the Boko Haram insurgency (between 2012 and 2015). A secondary aim of this study is to add to the body of knowledge on supply chain risk management practices in a developing economy. A qualitative research methodology involving case studies of four companies operating in the region was adopted. The findings indicate the sectional risk mitigating strategies adopted by the companies to contain the disruptions included a combination of the various options of risk avoidance, retention, reduction and transfer. Based on the findings obtained from the study, there is the need for companies to consider the conceptualization and implementation of supply chain risk management structure, policies and processes to guide against any form of risk in their operating areas.
Building a time-optimal power consumption strategy for a solar car
Authors: Selin I A , Kasatkin I I , Zakhlebaev E A , Hemminger O P 
Published: November 2019

Abstract
Solar car races are characterized by a long distance and plenty of ways to save and use energy. In this paper an optimization of a power management strategy for solar cars is introduced to minimize the time needed to pass the route of the competition by implementing the hierarchical technique.
Modelling the synchronization process of generators on gasturbine power plant
Authors: Shlyk Y K , Vlasova E P , Kuzyakov O N , Revyakin E E 
Published: November 2019

Abstract
The article is about modelling the process of synchronization generators on autonomous gas-turbine power plant. The paper presents the system of automatic speed control (ASC) and the synchronization algorithm for the gas turbine unit, developed in the Matlab Simulink. The proposed synchronization model makes it possible to reduce the time of input of the synchronous generator into operation.
Numerical simulation of the rotor winding temperature field with self-ventilation from the sub-slot duct
Authors: Verkhovtsev D , Gulay S 
Published: November 2019

Abstract
This paper describes the evaluation of rotor winding self-ventilation system with the radial ducts fed from sub-slot ducts for air and hydrogen cooled turbogenerators. The verification of the computational fluid dynamic (CFD) calculation has been carried out with the experiment. The conjugate heat transfer (CHT) is performed with the finite-volume method for rated excitation current. The analysis of the temperature field of the rotor winding with different configuration of the sub-slot duct was carried out.
Investigation of the thermal state of an asynchronous motor with an asymmetric magnetic circuit
Authors: Smetanin V , Denisenko V , Ataev T , Lytkin V 
Published: November 2019

Abstract
Modern technology for the processing of spent fuel assemblies (SFA) and radioactive waste (RW) is utilized in radiation protection cells. Under the conditions of exposure to high radiation fields, there is an intense destruction of various assemblies of actuators made of organic materials, including insulation of motor windings, which leads to frequent equipment failures requiring repair or replacement. Within the limits of the existing need, a project is being developed, with the purpose of creation of a radiation-resistant asynchronous electric motor with ceramic insulation for operation in. The proposed technical solutions make possible to increase the service life of the engine operating under the influence of radiation fields in radiation protection chambers by 4-5 times. Operation under an extreme condition requires an assessment of the engine itself. Considering a non-standard cooling system is of crucial importance for such projects.