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Search Results: 1 - 10 of 421438 matches for " M.Z. Addullah "
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Design Analysis and Performance Prediction of the Cardiac Axial Blood Pump
D.H. Hussein,H. Gitano-Briggs,M.Z. Addullah
Research Journal of Biological Sciences , 2012,
Abstract: Computational Fluid Dynamics (CFD) has been used for developing and evaluating the performance of a novel design of the Cardiac Axial Blood Pump (CABP). This device could be used as an implantable pump for boosting blood circulation in patients whose hearts are not providing sufficient output. Based on the Berlin Heart configuration the blood pump has been designed for a flow rate of 5 L min-1 and 100 mmHg of head pressure. Finite element analysis method has been performed to predict the shear stress, velocity and pressure drop applied on the fluid through the pump and the shear stress on the pump impeller. Furthermore, flow streamlines has been discussed to predict the flow streamlines behavior and the expected stagnation points. The aim of this research is to design an efficient blood pump to support the blood circulatory system and reduce the shear stress and blood hemolysis during transport through the pump. The design simulated at several rotational speeds (5000-7000 rpm) to investigate the relationship between the rotational speeds and shear stress. Results indicate that the rotational speed has a direct correlation with shear stress and pressure drop. On the same stream, we found that at 6500 rpm the pump gives its optimal pressure drop and shear stress.
Asymptotic Integration of A Class of Nonlinear Parabolic Equations
M.Z. Aissaoui
Journal of Engineering and Applied Sciences , 2012,
Abstract: The objective of this research is to give the explicit computation for the normal form and the normalization mapping of a class of the nonlinear parabolic equations developed in.
Extraction and characterization of seed oils
M.Z. Kyari
International Agrophysics , 2008,
Abstract: All the seeds examined in this project have been shown to contain varying levels of oils, mainly in the range of 26-42%, with the exception of Detarium microcarpum which contains about 7% of oils. Characterization of the oils by standard techniques suggest that they contain high levels of saturated fatly acids, judging by their low iodine values (IV) which did not exceed 88 in all cases. They are, hence, not suitable as alkyd resins for paint formulation but may, however, be used for soap production judging by their high saponification values (SV) in the range of 199-261. Lophira lanceolata showed considerable reduction in IV and increase in PV over a period of one month under storage conditions of light, darkness and refrigeration. In light, the IV value of 65 dropped by 50% at the end of one month, while under the same conditions the PV increased by almost tenfold. Less profound changes in both IV and PV were observed for oil stored in darkness and under refrigeration. The observed profound changes were explained as arising from oxidative rancidity of the oils. The nutritional non-oil residue of Lophira lanceolata may be suitable as animal feed judging by the balance of its nutrient composition.
Adenoma tireoideano tóxico: aspectos clínicos e conduta
Maciel, Léa M.Z.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 1998, DOI: 10.1590/S0004-27301998000400006
Abstract: toxic thyroid adenoma is one of the most important causes of hyperthyroidism. it occurs more frequently in women, older subjects and areas of iodine deficiency but the incidence of the disease is quite variable (2 to 33%). recent studies suggest that a mutation of the gene expressing tsh receptor or g protein is related to the pathogenesis of the adenoma. clinical features of toxic thyroid adenoma are similar to those observed in other types of thyrotoxicosis, but usually the symptomatology is mild. cardiovascular manifestations are frequently reported in these patients, who also have a thyroid nodule, increased levels of thyroid hormones and supressed tsh. clinical diagnosis is confirmed by a hot nodule at thyroid scintigraphy using 131i, 123i or 99mtc. clinical control of thyrotoxicosis is obtained by surgery or radioiodine therapy and, more recently, by ultrasound guided percutaneous injection of ethanol in the nodule. spontaneous regression of the disease in rare.
Participatory Learning Based Tri-Training Algorithm for Computer Aided Diagnosis
C. Deng,M.Z. Guo
International Journal of Soft Computing , 2012,
Abstract: Tri-training is a promising semi-supervised learning approach for Computer Aided Diagnosis (CAD) systems. It aims at enhancing the performance of the hypothesis that is learned on only a small amount of expert-diagnosed samples by utilizing the large amount of undiagnosed samples through co-training process. However, mislabeling the unlabeled samples in the co-training process is inevitable and harms the performance improvement of the hypothesis. In this study, we extend the co-training process by a participatory learning cognition paradigm and propose a new tri-training algorithm named PL-Tri-training. In detail, the acceptance unit of participatory learning is instantiated as a data editing operation and the critic unit of participatory learning is designed as an adaptive arousal strategy for the data editing. In the co-training process of PL-Tri-training, the acceptance unit utilizes data editing to identify and remove the mislabeled data, as well as the critic unit exploits arousal strategy to inhibit the invalid activation of data editing. Experiments on three benchmark medical data sets verify the effectiveness of the proposed algorithm. A successful application to the pulmonary nodules detection in chest CT images shows that PL-Tri-training can more effectively exploit the undiagnosed samples to improve the diagnosis performance than Tri-training and AC-Tri-training, which extends the co-training process only with the acceptance unit of participatory learning.
Recognising Fatigue Damaging Features in Variable Amplitude Loadings Using the S-Transform Approach
S. Abdullah,M.Z. Nuawi
Journal of Engineering and Applied Sciences , 2012,
Abstract: This study describes the use of the S-Transform to identify fatigue features in variable amplitude loadings. In normal situation, experimental fatigue loadings exhibit variable amplitude and nonstationary loading pattern, for which the traditional frequency domain analysis cannot provide accurate results. However, the time-localisation transform provides a promising solution. Since the S-transform if the simplification of the advanced time-frequency localization method, i.e., the wavelet transform, it is a good idea to study this transform in order to identify these fatigue features. The results obtained from this study showed that the high amplitude events were detected in the variable amplitude loading based on the difference pattern of the time-frequency localisation. These results were also compared to the plot of moving-damage using the Morrow’s strain-life fatigue damage model. Based on the promising outcomes, finally, it is proposed that further study of the S-transform should be carried out in broader scope of fatigue life assessment.
Suitability of duckweed (Lemna minor) as feed for fish in polyculture system
M.Z.H. Talukdar
International Journal of Agricultural Research, Innovation and Technology : IJARIT , 2012,
Abstract: In the present study, we conducted an experiment to evaluate the effects of duckweed (Lemna minor) as feed on fish production in polyculture. The experiment had 2 treatments where in treatment 1 (T1) ponds were supplied with duckweed as feed and in treatment 2 (T2) ponds were kept as control (without supply of duckweed). Average survival rates in T1 and T2 were 90 and 89%, respectively. The specific growth rates (SGR) were higher in T1. Calculated net production in T1 was 6.25 tons ha.-1 yr.-1 and in T2 was 2.84 tons ha.-1 yr.-1. The ranges of physico-chemical parameters analyzed were within the productive limit and more or less similar in all the ponds under both treatments during the experimental period. There were 24 genera of phytoplankton under 5 major groups and 10 genera of zooplankton under 3 major groups found in the experimental ponds. The net production in T1 was significantly higher than that of T2 indicated the use of duckweed as feed for fishes is economically sustainable in polyculture.
Effects of Intermediate Anchors on End Anchored Carbon Fibre Reinforced Polymer Laminate Flexurally Strengthened Reinforced Concrete Beams
M.Z. Jumaat,A. Alam
Journal of Applied Sciences , 2009,
Abstract: This research presents the results of an experimental study to look into the effects of intermediate anchors on end anchored CFRP laminate strengthened beams. Three beams of 125x250x2300 mm in dimensions were cast. Out of these, one beam was left un-strengthened and acts as the control beam and another two beams were strengthened with CFRP laminates. Both strengthened beams were end anchored to prevent premature end peeling. From the strengthened beams, one beam was intermediate anchored in the shear span to prevent premature shear failure. The anchorage lengths provided by the end and intermediate anchors were of 200 and 40 mm, respectively. The results showed that the intermediate anchors in shear span zone prevented premature shear failure. Result also showed that the strengthened beams with intermediate anchors had significant effects on failure loads, failure modes, strain characteristics, deflections and cracking patterns over the end anchored strengthened beam.
Experimental and Analytical Investigations on the Structural Behaviour of Steel Plate and CFRP Laminate Flexurally Strengthened Reinforced Concrete Beams
M.Z. Jumaat,A. Alam
Journal of Applied Sciences , 2008,
Abstract: This study presents an experimental and analytical investigation to compare the structural behaviour of externally bonded steel plates and Carbon Fiber Reinforceed Polymer (CFRP) laminates flexurally strengthened r.c. beams. For the experimental investigation, three r.c. beams were cast. One beam was tested in the un-strengthened condition to act as the control beam. The second beam was strengthened using steel plate while the third beam was strengthened using CFRP laminate. The strengthened beams were designed to have the same strength with the assumption that they would fail in a ductile manner. The test results indicated that although both beams were designed for the same strength, the CFRP laminate strengthened beam recorded a slightly higher failure load compared to the steel plate strengthened beam. The steel plate strengthened beam recorded a higher cracking load and less deflections, reinforcement bar strains, concrete strains and crack widths compared to the CFRP laminate strengthened beam. Results also showed that the CFRP laminate strengthened beam failed by premature concrete cover separation failure, whereas the steel plate strengthened beam failed by premature plate end interfacial debonding followed by concrete cover separation. The beams were also modelled using a Finite Element Method (FEM) package. The numerical results seemed to agree well with the experimental results.
Direct Partial Remelting of XW-42 Steel in Semi-Solid Zone
A. Alfan,M.Z. Omar,J. Syarif,Z. Sajuri
Journal of Applied Sciences , 2010,
Abstract: Microstructure that consists of spheroid grains in liquid matrix is desirable for semi-solid metal forming. In this study, a direct partial remelting from as annealed condition was used to examine microstructural evolution of XW-42 steel prior to thixoforming process. It was found out that M7C3 carbides dissolve inside the semi solid zone (between 1250-1270°C) while M23C6 carbides dissolve completely before entering semi-solid zone. The dissolution of these grain boundary carbides during partial remelting helps the grain spheroidisation of the XW-42 steel samples. Partial remelting at 1300 and 1340°C resulted in the formation of relatively spherical grains with liquid percent around 17%. The results indicate the suitability of these steel as a potential material for thixoforming through direct partial remelting route.
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