School of Physical Sciences

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https://repository.futo.edu.ng/handle/20.500.14562/1246

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Browsing School of Physical Sciences by Author "Alisa, Christopher"

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    Emissions of gasoline combustion by products in automotive exhausts
    (U. P., 2016-04) Nkwoada, Amarachi; Oguzie, Emeka; Alisa, Christopher; Agwaramgbo, Lovell; Enenebeaku, Conrad
    Increased gasoline consumption in automotive engines have triggered the emissions of greenhouse gases (GHG) especially carbon dioxide (CO2) from automotive exhausts. These exhaust emissions depend on factors like the engine combustion design and operating conditions, fuel grade and lubricant, the state of maintenance and local road conditions and continue to affect the concentration of pollutants emitted by automotives like CO2 and unburnt hydrocarbons which are very toxic to humans, leading to environmental pollution. In pursuant of improved efficient engine and less toxic emissions, the use of gasoline blends and biofuels are not the panacea since the exhaust-gas concentration and its constituent are not indicative of the contribution of the constituent to the overall emission due to variations in exhaust-gas flow rate with different engine types and automotive sources. Moreover real-time monitoring, turbocharging technologies, fuel injection strategies and catalytic exhaust aftertreatment may reduce emissions if compared to base engines but significant risk of CO2 induced climate change continue to persist, while CO2 capture technologies such as adsorption and absorption are limited in contrast to new developments in engine and exhaust technologies that are cheaper and locally sourced and could become the next trajectory.
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    Public participation in solid waste management practices within Owerri Urban of Imo State, Nigeria
    (U. P., 2016) Nkwoada, Amarachi; Alisa, Christopher; Duru, Ijeoma
    Municipal waste disposal have reached a crucial point in major urban areas in Nigeria especially Owerri urban and householder’s readiness to participate in waste management are still declining moreover the problems of indiscriminate dumping of refuse at central places and open dumping and burning at private residents continue to persist. A structured questionnaire was provided to residents of Owerri urban areas addressing lack of knowledge and attitude as a factor in waste recycling, methods of waste disposal, participation and practice using SCHOM analysis that identified 24 active waste dump/disposal sites. ANOVA at 0.95% value of F calculated was 0.25 and less than the value of F critical at value of 4.25 which shows that the burning and burying of waste was unaffected by usage of bins within any location but rather a habit acquired over the years. Also F calculated in column of ANOVA was less than F critical and showed that different zones exhibit different disposal habits and their levels of participation are affected by levels of quality of surrounding environment, popular trend, sex, age and income. SCHOM participants revealed a trend in volume of waste generated among householders to be Metals