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Study of Sedimentation Stability of Magnetorheological Fluid
Zhou Feng,
Luo Yiping,
Ren Hongjuan
Issue:
Volume 4, Issue 1, February 2015
Pages:
1-5
Received:
5 December 2014
Accepted:
17 December 2014
Published:
22 January 2015
Abstract: Magnetorheological fluid settlement issue has been one of the major issues that affect the performance of the magnetorheological fluid, it was focused by major enterprise and research institutions as new intelligent materials. This paper describes the settlement issue and analyses the reasons that causing settling of MRF at zero field strength. It comments the ways to improve the stability of magnetorheological fluid sedimentation problems, and makes a comprehensive introduction of the improvement measures. for instance: adding a surfactant and stabilizer, the organic polymer is wrapped in the surface of the magnetic particles, the soft magnetic particles are coated in non-metallic surface, the magnetic particle surface coated with a layer of metal powder, using improved version of the preparation process, adjusting ball feed ratio and milling time appropriately, adding in nanomaterials, etc.
Abstract: Magnetorheological fluid settlement issue has been one of the major issues that affect the performance of the magnetorheological fluid, it was focused by major enterprise and research institutions as new intelligent materials. This paper describes the settlement issue and analyses the reasons that causing settling of MRF at zero field strength. It ...
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Compressive Strength Characteristics of Kenaf Fibre Reinforced Cement Mortar
Omoniyi Tope Moses,
Duna Samson,
Othman Musa Waila
Issue:
Volume 4, Issue 1, February 2015
Pages:
6-10
Received:
20 December 2014
Accepted:
28 December 2014
Published:
25 January 2015
Abstract: This paper presents the findings of an investigation on the compressive strength properties of kenaf fiber composite mortar. Water–retted kenaf fibers were used as reinforcement in cement mortar. Fiber contents of 1%, 2% and 3 % (by weight of cement) with varying lengths of 10mm, 20mm and 30mm were used to produce 50mm mortar cubes. The Composite mortars were cured in water for 3, 7, 14, 21, and 28days. A total of 150 mortar cubes were used for the study. Density, water absorption and compressive strength tests were conducted on the composite mortar. Regression analysis was carried out on the compressive strength results using Minitab 15. The results showed that water absorption and density of the composite mortar increased as the volume of fiber and length increased. Compressive strength decreased with increasing fiber volume and length. However, there was increase in compressive strength of between 0.21%-22.3% for composite mortar containing 1-3% volume of fiber with 10mm fiber length. The fitted regression model showed a perfect relationship (R2=84.5%) between compressive strength, fiber volume, fiber length and curing age. Therefore, fiber volume, fiber length and curing are useful predictors of the selected model. Model adequacy test reveals that the fitted regression model is highly adequate. There was no statistically significant difference in the compressive strength of the control samples and those containing 1-3% fiber volumes with fiber length of 10mm.
Abstract: This paper presents the findings of an investigation on the compressive strength properties of kenaf fiber composite mortar. Water–retted kenaf fibers were used as reinforcement in cement mortar. Fiber contents of 1%, 2% and 3 % (by weight of cement) with varying lengths of 10mm, 20mm and 30mm were used to produce 50mm mortar cubes. The Composite m...
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The Investigation of Mechanical Behaviors of Poly Methyl Methacrylate (PMMA) with the Addition of Bone Ash, Hydroxyapatite and Keratin
Issue:
Volume 4, Issue 1, February 2015
Pages:
16-19
Received:
19 January 2015
Accepted:
30 January 2015
Published:
11 February 2015
Abstract: This paper presents investigating the effects of adding ash, keratin and hydroxyapatite to the content of Polymethyl methacrylate (PMMA) used as the base material of prosthesis on the mechanical characteristics of PMMA. The materials of hydroxyapatite, bone ash, and keratin were added to the content of PMMA, which is used particularly in dentistry as the base material of prosthesis, in the proportions of %1, %3 and %5, respectively. The resulting mixtures were put into the molds and solidified in order to be used in the experiments of press, impact indentation, and hardness. Each experiment was conducted by preparing three experimental samples; the results were compared according to the average values of the experimental samples.
Abstract: This paper presents investigating the effects of adding ash, keratin and hydroxyapatite to the content of Polymethyl methacrylate (PMMA) used as the base material of prosthesis on the mechanical characteristics of PMMA. The materials of hydroxyapatite, bone ash, and keratin were added to the content of PMMA, which is used particularly in dentistry ...
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