ABSTRACT The environment around radio navigation aids systems (navaids) includes buildings whose roofing materials interfere with signal propagation. This interference may cause partial loss of intelligence in communication between navaids and flying aircrafts. Buildings around airports have been restricted partly because they pose threats to flight navigation. This restriction as captured in the Laws of Kenya has not been supported by sufficient data. Previous studies have shown that about h...
Abstract In Nigeria, stress challenges are usually prevalent mostly in construction industry. The construction industry is a competitive and challenging industry. Therefore, most of the construction professionals suffer from stress. This study aims to explore the relationship between stressors, stress levels, performance, and coping behaviors among construction professionals. These professionals include project managers, architects, field and office engineers, designers, and other profe...
ABSTRACT Energy benchmarking and carbon footprint reduction opportunities in Portland cement manufacturing processes in Nigeria are presented. Life Cycle Assessment (LCA) is used to estimate the environmental impact of three cement manufacturing processes in Nigeria. The energy consumption of the cement manufacturing processes are evaluated using energy Benchmarking and Energy Savings Tool for cement (BEST-Cement). BEST-Cement evaluates and compares the energy consumption of the cement manuf...
The internet is an unavoidable infrastructure that can provide enormous benefits to the average person/organization. Unfortunately there are elements whose goal is to interfere with the smooth benefits of it to users for either mischief or criminal intent. This has spawned a bourgeoning industry that focuses on developing and deploying countermeasures to the products of hackers and other internet pirates. Internet security is configured around several structural features that may be maintain...
Some physical and mechanical properties of two Nigerian beniseed accessions (Yandev-55 and E8) were determined at 5 moisture content levels of 5.3, 10.6, 16.1, 22.4, and 28.3 per cent (wet basis). These were used as inputs into designing a beniseed oil expeller, as available ones could not perform effectively with the seed. The determined physical properties were linear dimensions, size, sphericity, bulk and true densities, porosity, thousand kernel weight and coefficient of friction betw...
Solar collectors mainly produced from poly-crystalline (P-Si) and micro-crystalline silicon (µ-Si) are in high demand in Nigeria due to persistent power challenges. The silicon are mostly imported and µ-Si is preferable due to its low cost. The µ-Si is extracted from Rice Husk (RH). However, the procedure of setting its optimal process variables (temperature, time and solvent volume) which are determinants of the reduction in cost is under reported in the literature. The aim of this study ...
ABSTRACT Cloud computing has not only emerged as an accepted computing paradigm, but is fast penetrating into major sectors of human endeavor. These include banking, human resources management, justice administration, investigation, academia/research, commerce, health administration etc. Based on the public and experts concerns about cloud applications in the mentioned sectors, preliminary investigations were carried out and it was found that security, and in particular, authenticating...
ABSTRACT Technology of milling and grinding machine is one of the simplest methods of processing agricultural raw materials alternative to the traditional methods of grain/tuber processing using stone, mortar and pestle. However, machines constructed using metal plates results in tearing and wearing away of the materials of construction. The effect of this is the contamination of the processed foodstuff. This is known to have negative health implications when accumulated and consumed in larg...
More recently, Solvent Extraction of Copper from aqueous solution has been an area for considerable research and development. The present programme has gone a stage further by investigating the separation of copper from mixed solutions cf copper and iron in Electrical fields. The work was carried out in a countercurrent column which gave differential as opposed to the stage contact of previous workers. Continuous transfer of material between phases occurs resulting in the differential change ...
ABSTRACT The traditional system of producing crops using soil (geoponics) is currently facing major challenges resulting in food deficits. An alternative is the adoption of soil-less culture (hydroponics) which is regarded as key in increasing production of vegetables, herbs and ornamentals. The study aimed at preparing a hydroponic medium from black cotton soil and rice husks. The process entailed moulding, firing, size reduction and performance evaluation. The aggregates were evaluated on ...
Research on the single pot green synthesis of silver nanoparticles (AgNPs) was done using aqueous medicinal plant extract of Tithonia diversifolia and Acalypha wilkesiana. Characterization was carried out by spectroscopic techniques. Experimental optimization studies and the antimicrobial activity of the nanoparticles were investigated. Bottom-up approach was applied for the synthesis of both Tithonia diversifolia silver nanoparticles (TD-AgNPs) and Acalypha wilkesia silver nanoparticles (AW-...
ABSTRACT Energy systems based on fossil oil products have witnessed increased demand all over the world with prices reaching new peaks, and continue to further weaken African economies. Potential biofuel oil sources, production and their optimization in standard to fossil equivalent should be sought. Sour plum (Ximenia americana L.) seed oil as one potential biofuel was extracted from plant seeds using screw press then tests were carried out to evaluate its properties as substitute for kerose...
ABSTRACT The facilities layout problem is an integral part of facilities planning that aims to systematically arrange and locate all production units within a facility with an objective of improving the production operations of a company. Numerical Machining Complex is planning to improve the production of its manufacturing operations in its machining and fabrication workshop. It seeks to enhance the performance of the existing workshop in terms of efficiency, productivity, and space utiliza...
ABSTRACT Risk-based approach in spare part inventory management and plant maintenance is essential for ensuring asset integrity in a process facility. The sugar industry in Kenya has been a victim of inefficient spare part inventory management resulting to unscheduled factory stoppages, factory breakdowns, obsolescence of plant and equipment whose maintenance costs are very high. This has been compounded by high maintenance costs and expensive spares which are also difficult to find and proc...
ABSTRACT The manufacturing sector today faces high competition and there is an increasing demand for customers to receive quality products, at the right time and at a competitive price. This then calls for manufacturing firms to improve productivity more so in automotive manufacturing industry. Master Fabricators Limited had in the past attempted to improve throughput time for the buses manufactured by increasing the number of employees and hiring highly qualified production personnel to ste...