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Assessment of Ambient Day Indoor and Outdoor Noise Levels in University of Science and Technology Port Harcourt
Tubonimi Joseph Kio Ideriah
Issue:
Volume 3, Issue 6, November 2015
Pages:
265-278
Received:
14 September 2015
Accepted:
21 September 2015
Published:
12 October 2015
Abstract: Indoors and outdoors ambient noise levels were measured within the RSUST to determine the levels and sources of noise pollution within the university campus in order to ascertain if the noise level has exceeded acceptable limit to affect the air quality of the environment and also access the impact of various activities in the university with regard to noise pollution. Noise levels were measured with a digital sound level meter model 407730 manufactured by EXTECH instruments with “A” weighting scale. The measured noise levels ranged between 47.8 dB (A) and 103.2 dB (A). The mean noise levels recorded around the 2000 KVA and 1275 KVA generators exceeded the permissible noise levels guideline of 90dB (A) recommended by Occupational Safety Health Agency and Federal Ministry of Environment while all the mean noise levels measured within the university exceeded the guideline values of 35 – 55 dB (A) set by World Health Organization. High positive correlation coefficients between indoor and outdoor were recorded. Analysis of variance on noise levels between hostels, road junctions, gates and Departments showed significant difference (P < 0.05). Noise levels at outdoors were generally higher than indoors. t - test on the mean noise levels between indoor and outdoor were not significant (P > 0.05) but t - test between maximum and minimum noise levels and between the Departments were significant (P < 0.05). The measured noise levels were typical of urban communities in developing countries. In addition to steady electricity supply from National grid, solar plant or sound proof generators were recommended.
Abstract: Indoors and outdoors ambient noise levels were measured within the RSUST to determine the levels and sources of noise pollution within the university campus in order to ascertain if the noise level has exceeded acceptable limit to affect the air quality of the environment and also access the impact of various activities in the university with regar...
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Establishing a Digital Topographic Database Using a High Resolution Imagery
Chris Adebola Odeyemi,
Adeyinka Jimoh Lamidi,
Taiwo Jimoh Oluboyede
Issue:
Volume 3, Issue 6, November 2015
Pages:
279-287
Received:
9 July 2015
Accepted:
13 July 2015
Published:
19 November 2015
Abstract: This paper takes an overview of the use of high reslution imageries for the establishment of digital topographic information, it also review some modern techniques of map making, using high resolution imageries. It shows that with the rapid and successful advances in remote sensing, GIS, and GPS technologies in the mapping sciences, coupled with the expected increase in the number of sensors for sub-meter (spatial) resolution satellite images,the sustainable development of Nigeria can be attained with the use of maps to achieve UN Sustainable Development Goals (SDG).
Abstract: This paper takes an overview of the use of high reslution imageries for the establishment of digital topographic information, it also review some modern techniques of map making, using high resolution imageries. It shows that with the rapid and successful advances in remote sensing, GIS, and GPS technologies in the mapping sciences, coupled with th...
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Analysis of Variations Control Model for Vehicle Manufacture
Issue:
Volume 3, Issue 6, November 2015
Pages:
288-294
Received:
28 October 2015
Accepted:
9 November 2015
Published:
19 November 2015
Abstract: Because the body manufacturing quality affects the quality of the vehicle, the control of manufacturing quality plays a decisive influence on the development of the auto industry. As an important factor of manufacturing quality, the research of variations is essential. In this paper, after analysising and comparing of the model used to control the variations of body, which is from traditional to existing, rigid to flexible, we got the optimization model which is based on the model of influence coefficient method. And making a bold speculation about the future research trends in this area, aim to provide useful reference for the future research.
Abstract: Because the body manufacturing quality affects the quality of the vehicle, the control of manufacturing quality plays a decisive influence on the development of the auto industry. As an important factor of manufacturing quality, the research of variations is essential. In this paper, after analysising and comparing of the model used to control the ...
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Managing the Drivers of Cost Escalation in the Road Development Sector: An Overview
Joseph Ignatius Teye Buertey,
Theophilus Adjei-Kumi,
Felix Atsrim,
Kwesi Boateng
Issue:
Volume 3, Issue 6, November 2015
Pages:
295-303
Received:
14 September 2015
Accepted:
21 October 2015
Published:
24 November 2015
Abstract: The management of construction cost escalation requires that proponents understand the drivers of project cost. The aim of this research was therefore to evaluate the causes of project cost escalation with a case study in Ghana. The research was carried out using quantitative approach by distributing questionnaires to built-environment professionals and stakeholders in the road sector. Findings suggest that fluctuations in cost indices, variation in work due to incomplete scope definition, corruption, unstable exchange rate, schedule delays, and poor risk management are the major key drivers affecting cost escalations on road projects in Ghana. The study held that the lead times allowed between base dates of estimates, actual award and commencement date of the project has a contributing factor for cost escalations. To manage cost escalation, the challenge of incomplete scope definition and instability in micro economic indicators must be managed by the players of the economy. To curtail corruption, the procedures for the awarding of contracts which are subjective with public officials having discretions to determine the least evaluated bidders even though there are procedures for determination, must be reviewed. The use of such discretionary powers accounts for perceived corruption along with contractor behaviour resulting in under dealings. The bidding and award stage of projects mark the beginning of interaction between public official and contractors and hence, the hatching point for project corruption. It is recommended that the management of cost escalation would require the improvement of the governance structures and procurement process for public sector projects. The conclusion of the survey suggests that a holistic approach is required to control the trend but more importantly, on attitudes of officials involved which would require improved ethical commitment.
Abstract: The management of construction cost escalation requires that proponents understand the drivers of project cost. The aim of this research was therefore to evaluate the causes of project cost escalation with a case study in Ghana. The research was carried out using quantitative approach by distributing questionnaires to built-environment professional...
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A Spiral Development Model for an Advanced Traffic Management System (ATMS) Architecture Based on Prototype
Junping Xie,
Yongfeng Ma,
Li Yuan,
Yan Liu
Issue:
Volume 3, Issue 6, November 2015
Pages:
304-308
Received:
13 November 2015
Accepted:
25 November 2015
Published:
16 December 2015
Abstract: As a symbol of economic growth, the deployment of an Intelligent Transportation System (ITS) became a necessity of a country, especially in a developing country. The Advanced Transportation Management System (ATMS) is one of the pivotal subsystems of ITS. With the development of digital image processing, the deployment of such a system can be implemented in an effective and economical way. The process of constructing an ATMS with minimum cost and time will be an important criterion in the selection of such a system for a developing country. In this paper, a spiral development method for an ATMS based on prototype was presented in order to overcome the shortcomings of the traditional waterfall model. The focus on the spiral development is to improve the design concepts and system requirements to avoid large-scale modification in the later development phases due to errors caused in the early ones. An applied architecture is constituted with the innovative technologies, e.g. 4th-generation mobile technology (4G), high-speed optical fiber communication technology with a national traffic communication backbone network in China, which ensures the latest technology is available to traffic management.
Abstract: As a symbol of economic growth, the deployment of an Intelligent Transportation System (ITS) became a necessity of a country, especially in a developing country. The Advanced Transportation Management System (ATMS) is one of the pivotal subsystems of ITS. With the development of digital image processing, the deployment of such a system can be imple...
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Review on Baseline Correction of Strong-Motion Accelerogram
Issue:
Volume 3, Issue 6, November 2015
Pages:
309-314
Received:
11 November 2015
Accepted:
7 December 2015
Published:
25 December 2015
Abstract: Because of various reasons, the baseline drift in the strong motion accelerogram was often founded, especially in the near-fault accelerogram. The baseline drift could lead to the unreliable velocity and displacement obtained by the accelerogram integration without or with improper specialized baseline correction. For dealing with the problem, in the study, the various reasons causing the baseline drift in accelerogram were analyzed, the baseline correction principle and the different baseline correction methods were discussed, and the problems in the methods were pointed out.
Abstract: Because of various reasons, the baseline drift in the strong motion accelerogram was often founded, especially in the near-fault accelerogram. The baseline drift could lead to the unreliable velocity and displacement obtained by the accelerogram integration without or with improper specialized baseline correction. For dealing with the problem, in t...
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Computational Investigation of Flow Separation over Naca 23024 Airfoil at 6 Million Free Stream Reynolds Number
B. S. Anil Kumar,
Ramalingaiah,
S. Manjunath,
Rudresh Ganganna
Issue:
Volume 3, Issue 6, November 2015
Pages:
315-321
Received:
2 November 2015
Accepted:
25 November 2015
Published:
4 January 2016
Abstract: The following work is the CFD analysis of NACA 23024 airfoil. The analysis is carried out for a free stream Reynolds number of 6 million for which the wind tunnel results are available. The CFD analysis is carried out using Ansys Fluent Solver. The analysis is carried out using Spalart Allmaras turbulence model, K-omega SST turbulence model with flow transition capabilities, Standard K-Epsilon Turbulence model and K-omega SST turbulence model.It is to be noted that each turbulence model employs different mathematical approach to model boundary layer. The analysis results are then compared with the wind tunnel results and the performance of the turbulence models are discussed. This study recommends an accurate methodology to conduct CFD analysis for external aerodynamic flows.
Abstract: The following work is the CFD analysis of NACA 23024 airfoil. The analysis is carried out for a free stream Reynolds number of 6 million for which the wind tunnel results are available. The CFD analysis is carried out using Ansys Fluent Solver. The analysis is carried out using Spalart Allmaras turbulence model, K-omega SST turbulence model with fl...
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