RESPONSE INTERACTION OF ARTERY UNDER MECHANICAL VIBRATION

Hypertension or high blood pressure, sometimes called arterial hypertension, is a chronic medical condition in which the blood pressure in the arteries is elevated.  The aim of this work was to analyse mathematically the vibration of the artery and show its relationship to hypertension related cases.  Principles of conservation of mass and momentum inline with Euler-Bernoulis method were used.  By idealising the artery resting on the tissue as an elastic beam that is resting partially on an elastic continuum and simply supported, a boundary value partial differential equation governing the blood- artery- interaction mechanics was formulated. The governing partial differential  equation for the problem was obtained and after linearization was solved using integral methods of Fourier-Laplace Transform.  Simulations for some cases were carried out varying some choice parameters.  Findings show that natural frequency of the artery decreases with increase in the mean arterial pressure (MAP).  It was equally found out that vibration of the artery generally increases with increase in MAP and increase in mode.  It was thus concluded that mechanical vibration of the artery increases with increase in blood pressure, and continuous vibration can lead to fatigue and failure which can cause obstruction in the supply of blood to other parts of the body and may lead to stroke.     &nbsp

Evaluation of A Clay Mineral Deposit in Abeokuta, South-West Nigeria

Clay, in regard to its origin is unique. The kaolin of the mine of Ajebo has a hydrothermal geological formation. It presents itself a fragile and crumbly material, of whitish colour. Therefore, the objective of this paper was to evaluate the clay mineral of Ajebo deposit, its microstructure using scanning electron microscopy, X-ray diffraction and thermal analysis (DSC/TG). The results showed that Ajebo clay belongs to the kaolin group (Kaolinite, nacrite, dickite, and halloysite). Elementary analysis showed the mineral to be composed mainly of aluminium, oxygen and silicon, with a low content of iron. The dehydrated state of the mineral was confirmed by XRD analysis; the basal spacing reflections indicate a sharp peak at 7Å of d001 and the absence of a peak at 10Å, which is indicative of hydrated kaolin. The SEM/SE studies indicated that Ajebo clay mineral particles are smaller than 10μm, forming agglomerates. &nbsp

COMPARISON BETWEEN KAOLIN AND QUARTZITIC CLAY PERFORMANCE IN THE EFFECT OF WOOD ASH ADDITION ON THE MECHANICAL AND OTHER PROPERTIES OF PORCELAINISED STONEWARE TILES

Porcelain represents the foundation of the ceramic discipline and one of the most complex ceramic materials. Composed primarily of clay, feldspar and quartz, porcelains are heat treated to form a mixture of glass and crystalline phases. This focuses on raw materials with the addition of wood ash processing and mechanical behaviors. The use of wood ash as in manufacturing ceramic tiles can increase the utilization, as well as reduce the cost of raw materials in the tile industry and provide a competitive edge to Nigerian tile Manufactures against foreign competitions. Ring was taken ensured completion of the pozzolainic reactions instituted by the wood ash and the production of dense compounds acting as filler within the pores of the porcelain mass. It was also found that the higher the wood ash content in the porcelainª¤? the lower their strength and density, the permeability 5-10 % cow dung un clays is the best ratio that gives the desired combination of opposing qualities and density, thus the ratio that gives the optimum mechanical and other properties. It was noticed from this research work, clay with kaolinitic content is better used than clay with quartzitic content in formulating porcelainised stoneware tile specimenª¤? consisting of the mixture of both quartizitic and kaolinitic clay has better performance than ordinary quartzitic clay sample.ª¤

STRENGTH CHARACTERISTICS OF NIGERIAN QUARTZITIC AND KAOLINITIC CLAYS IN WALL TILE COMPOSITION

Clays from four different deposits in Abeokuta, Nigeria (Abiola Way 1 (AW1), Abiola Way 2 (AW2), Asero (AS), Mysis (MY)) have been investigated. Their chemical compositions were determined by Atomic absorption spectroscopy and the most crystalline phases were identified by X-ray diffraction. Wall tile specimens were formulated with clay, wood ash (flux) and quartz (filler). The compositions of the wood ash and quartz were kept constant in the wall tile composition. The results revealed that the  wall tile composition containing higher amount of quartzitic clays, exhibited lower shrinkage, higher water absorption rate while lower strength and the wall tile containing higher amount of kaolinitic clay showed higher shrinkage, higher strength due to better densification and lowest water absorption rate in the temperature range of 1050-11500C.Â

Characterization of Ajebo Clay in South West Nigeria

Ajebo clay deposit in Abeokuta, South West, Nigeria was characterized to establish its use industrially. The major properties investigated were drying and firing behaviour, apparent porosity, bulk density, water absorption capacity,, chemical compositions and X-ray diffraction. The qualitative analysis by inductively coupled plasma showed the mineral to be composed mainly of Aluminium, Oxygen and Silica, with low content of iron. The clay has modulus of rupture (strength) ranging from 15.04-35.62kgF/cm2 and the colour ranged from white brown to light red on firing. The properties signify that Ajebo clay is stoneware clay. It can be used for the production of stoneware, flowerpot, tiles and brick making