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Articles 31 - 60 of 463
Full-Text Articles in Mechanical Engineering
Experimental And Numerical Investigation Of Heat Transfer In Cnt Nanofluids
Experimental And Numerical Investigation Of Heat Transfer In Cnt Nanofluids
Faculty of Engineering University of Malaya
Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01wt%, stabilised by 1.0wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured …
Investigating Cavitation Peening Parameters For Fatigue Performance Using Designed Experiment, Mohammadsadegh Mobin, Afshan Roshani, Mahmood Mobin, Ali Rastegari
Investigating Cavitation Peening Parameters For Fatigue Performance Using Designed Experiment, Mohammadsadegh Mobin, Afshan Roshani, Mahmood Mobin, Ali Rastegari
Mohammadsadegh Mobin
Mechanical surface enhancement techniques such as cavitation peening (CP) have various design parameters which can affect the fatigue performance of the part. In this study, a full factorial design of experiment is applied to investigate the effects of cavitation peening process parameters on the fatigue performance of carburized steel. These parameters include standoff distance, cavitation number, nozzle size, and exposure time. The response variables considered in this experiment include residual stress, surface roughness and austenitic ratio. Results obtained from full factorial design of experiment method were compared with the results from literature which applied Taguchi method. The comparison revealed that …
The Mechanical Properties Of Ukam Fibre-Reinforced Cashew Nut Shell Resin Composite, Innovative Research Publications Irp India, Ibe Godwin Anwara, Dumpe Koba Barinem
The Mechanical Properties Of Ukam Fibre-Reinforced Cashew Nut Shell Resin Composite, Innovative Research Publications Irp India, Ibe Godwin Anwara, Dumpe Koba Barinem
Innovative Research Publications IRP India
The mechanical properties of ukam fibre cashew nut shell resin composite were studied for possible structural application in engineering. Basically, the hand lay-up method was employed to manufacture the test samples of the composite by 40:60 weight ratio and testing the samples’ mechanical properties using the instron tensile machine and the izod impact machine respectively. Consequently, the experiments demonstrated that the ukam fibre reinforced cashew nut shell resin composite has a maximum tensile strength of 40.5MPa, the impact energy of 1.93J and a young tensile modulus of 1GPa. The above results indicate that ukam fibre- reinforced cashew nut shell resin …
Joints Properties Of One Side Welded Of Ship Materials With Variation Of Angle Groove, Innovative Research Publications Irp India, Yustiasih Purwaningrum, Triyono No, Tri Syarifuddin, Isharyadi Di
Joints Properties Of One Side Welded Of Ship Materials With Variation Of Angle Groove, Innovative Research Publications Irp India, Yustiasih Purwaningrum, Triyono No, Tri Syarifuddin, Isharyadi Di
Innovative Research Publications IRP India
Indonesian National Transportation Safety Commission based on data from the period 2003-2008 and The Study for the Maritime Traffic Safety System Development Plan states that 21% of the cause of the accident was the failure of Indonesian ship in the structure of the ship (hull structure). This study aimed to investigate the effect of variations in the angle groove of one side welding. Material used is low carbon steel LR grade A in a thickness 12 mm were welded using GMAW (Gas Metal Arc Welding) with a angle groove 20°, 40° and 60°. The physical properties examined with an optical …
Development Of Composite Material Testing Facility For Cryogenic Fuel Tank Applications, Innovative Research Publications Irp India, Sandeep Singh, Karthik Sunil, Prudhvinath Reddy, Idris Syed Mahaboob, Raja Sekhar Dondapati
Development Of Composite Material Testing Facility For Cryogenic Fuel Tank Applications, Innovative Research Publications Irp India, Sandeep Singh, Karthik Sunil, Prudhvinath Reddy, Idris Syed Mahaboob, Raja Sekhar Dondapati
Innovative Research Publications IRP India
Composite materials are being used extensively in different realms of science for various applications. There use is prominent in the aerospace industry. The testing of these composite materials is of substantial importance, as they might be susceptible to failure due to the variation in the temperature ranges and the cryogenic temperatures which the materials have to endure. In the present work, the tensile strength of composite materials are observed using double walled vacuum chamber which is designed for the Universal Testing Machine (UTM)
The Use Of Initial Imperfection Approach In Design Process And Buckling Failure Evaluation Of Axially Compressed Composite Cylindrical Shells
Faculty of Engineering University of Malaya
Thin-walled cylindrical shells are susceptible to buckling failures caused by the axial compressive loading. During the design process or the buckling failure evaluation of axially-compressed cylindrical shells, initial geometric and loading imperfections are of important parameters for the analyses. Therefore, the engineers/designers are expected to well understand the physical behaviours of shell buckling to prevent unexpected serious failure in structures. In particular, it is widely reported that no efficient guidelines for modelling imperfections in composite structures are available. Knowledge obtained from the relevant works is open for updates and highly sought. In this work, we study the influence of imperfections …
A Review On Thermophysical Properties Of Nanoparticle Dispersed Phase Change Materials
A Review On Thermophysical Properties Of Nanoparticle Dispersed Phase Change Materials
Faculty of Engineering University of Malaya
A review of current experimental studies on variations in thermophysical properties of phase change material (PCM) due to dispersion of nanoparticles is presented in this article. Dispersed carbon nanotubes/fiber and different metal/metal oxide nano particles in paraffin and fatty acids might be a solution to improve latent heat thermal storage performance. Thermophysical properties such as thermal conductivity, latent heat, viscosity and super cooling of phase change materials (PCM) could be changed for different physical properties of dispersed nanoparticle such as size, shape, concentration and surface properties. Among the nano particles, comparatively carbon nanotubes and carbon nano fiber have shown better …
Isi Document Delivery No.: Ce6qq Times Cited: 0 Cited Reference Count: 44 Cited References: Adalberth K, 1997, Build Environ, V32, P321, Doi 10.1016/S0360-1323(96)00069-8 [Anonymous], 2005, E38405 Astm, P1 Arena Ap, 2003, Build Environ, V38, P359, Doi 10.1016/S0360-1323(02)00056-2 Asif M, 2007, Build Environ, V42, P1391, Doi 10.1016/J.Buildenv.2005.11.023 Attia S, 2011, State Art Existing E Bare Jc, 2000, Int J Life Cycle Ass, V5, P319, Doi 10.1007/Bf02978665 Blengini Ga, 2010, Energ Buildings, V42, P869, Doi 10.1016/J.Enbuild.2009.12.009 Blengini Ga, 2010, Int J Life Cycle Ass, V15, P652, Doi 10.1007/S11367-010-0190-5 Bribian Iz, 2009, Build Environ, V44, P2510, Doi 10.1016/J.Buildenv.2009.05.001 Buchan Rd, 2003, Estimating Builders Cole Rj, 1996, Build Environ, V31, P307, Doi 10.1016/0360-1323(96)00017-0 Cole Rj, 1999, Build Environ, V34, P335 Ding Gkc, 2007, Build Res Inf, V35, P487, Doi 10.1080/09613210601116408 Fava J, 2009, J Ind Ecol, V13, P491, Doi 10.1111/J.1530-9290.2009.00150.X Fay R, 2000, Build Res Inf, V28, P31 Goedkoop M, 2010, Intro To Lca Guinee Jb., 2002, Hdb Life Cycle Asses, P692 Han G, 2011, Life Cycle Assessmen Huijbregts Maj, 2003, Environ Sci Technol, V37, P2600, Doi 10.1021/Es020971+ Iso, 2006, 140402006 Iso, V2006 Iso, 2006, 14044 Iso, V2006 Iyer-Raniga U, 2012, Build Environ, V47, P138, Doi 10.1016/J.Buildenv.2011.08.001 Khasreen Mohamad Monkiz, 2009, Sustainability, V1, Doi 10.3390/Su1030674 Kofoworola Of, 2009, Energ Buildings, V41, P1076, Doi 10.1016/J.Enbuild.2009.06.002 Lopez-Mesa B, 2009, Build Environ, V44, P699, Doi 10.1016/J.Buildenv.2008.05.017 Mithraratne N, 2004, Build Environ, V39, P483, Doi 10.1016/J.Buildenv.2003.09.008 Monahan J, 2011, Energ Buildings, V43, P179, Doi 10.1016/J.Enbuild.2010.09.005 Ochsendorf J, 2011, Methods Impacts Oppo Ortiz O, 2009, Constr Build Mater, V23, P28, Doi 10.1016/J.Conbuildmat.2007.11.012 Ortiz-Rodriguez O, 2010, Sci Total Environ, V408, P2435, Doi 10.1016/J.Scitotenv.2010.02.021 Ove Arup And Partners Hong Kong Ltd, 2007, Intr Lif Cycl En Ass Peuportier Blp, 2001, Energ Buildings, V33, P443, Doi 10.1016/S0378-7788(00)00101-8 Rebitzer G, 2004, Environ Int, V30, P701, Doi 10.1016/J.Envint.2003.11.005 Rossi B, 2012, Build Environ, V51, P395, Doi 10.1016/J.Buildenv.2011.11.017 Sartori I, 2007, Energ Buildings, V39, P249, Doi 10.1016/J.Enbuild.2006.07.001 Scheuer C, 2003, Energ Buildings, V35, P1049, Doi 10.1016/S0378-7788(03)00066-5 Singh A, 2010, J Monetary Econ, V57, P729, Doi 10.1016/J.Jmoneco.2010.05.012 Suh S, 2007, Int J Life Cycle Ass, V12, P351, Doi 10.1065/Lca2007.08.358 Thiers S, 2012, Build Environ, V51, P276, Doi 10.1016/J.Buildenv.2011.11.018 Thormark C, 2002, Build Environ, V37, P429, Doi 10.1016/S0360-1323(01)00033-6 Utama A, 2008, Energ Buildings, V40, P1911, Doi 10.1016/J.Enbuild.2008.04.017 Utama A, 2009, Energ Buildings, V41, P1263, Doi 10.1016/J.Enbuild.2009.07.025 Van Ooteghem K, 2012, Build Environ, V49, P212, Doi 10.1016/J.Buildenv.2011.09.028 Wu Jg, 2010, Environ Manage, V46, P610, Doi 10.1007/S00267-010-9497-Z Abd Rashid, Ahmad Faiz Yusoff, Sumiani 0 Pergamon-Elsevier Science Ltd Oxford Renew Sust Energ Rev
Faculty of Engineering University of Malaya
Thermal energy storage as sensible or latent heat is an efficient way to conserve the waste heat and excess energy available such as solar radiation. Storage of latent heat using organic phase change materials (PCMs) offers greater energy storage density over a marginal melting and freezing temperature difference in comparison to inorganic materials. These favorable characteristics of organic PCMs make them suitable in a wide range of applications. These materials and their eutectic mixtures have been successfully tested and implemented in many domestic and commercial applications such as, building, electronic devices, refrigeration and air-conditioning, solar air/water heating, textiles, automobiles, food, …
Fatigue Of Swollen Elastomers
Faculty of Engineering University of Malaya
The compatibility of the properties of elastomer with conventional diesel fuel has made it favourable in many engineering applications. However, due to global energy insecurity issues, there is an urgent need to find alternative renewable sources of energy as replacements to conventional diesel. In this respect, biodiesel appears to be a promising candidate. Hence, research into the compatibility and fatigue characteristics of elastomers exposed to biodiesel becomes essential. The present paper introduces the first attempt to investigate the effect of different solvents on the fatigue of swollen elastomers. The filled nitrile rubbers are immersed in the palm biodiesel and conventional …
Evaluation Of The Mechanical Properties Of Aa 6063 Processed By Severe Plastic Deformation
Evaluation Of The Mechanical Properties Of Aa 6063 Processed By Severe Plastic Deformation
Faculty of Engineering University of Malaya
In this study, the mechanical properties, including surface hardness, tensile strength, fatigue, and fretting fatigue behavior of AA 6063 processed by equal channel angular pressing as the most efficient severe shear plastic deformation (SPD) technique, were investigated. Following the SPD process, samples were subjected to heat treatment (HT), hard anodizing (HA), and a combination of HT and HA. Rotating-bending fretting fatigue tests were performed to explore the samples' response to the fretting condition. From the experimental fatigue and fretting fatigue tests, it was apparent that the SPD treatment had a positive effect on enhancing the fatigue and fretting fatigue lives …
The Tribological And Electrochemical Behavior Of Hvof-Sprayed Cr3c2-Nicr Ceramic Coating On Carbon Steel
Faculty of Engineering University of Malaya
High Velocity Oxygen Fuel (HVOF) is an excellent approach to prepare a good, wear-resistant lamella of Chromium Carbide-Nickel Chrome (Cr3C2-NiCr) on carbon steel for high temperature application. This research investigates the effect of a thin, deposited layer of Cr3C2-NiCr on carbon steel in terms of wear and corrosion properties. The microstructure of the HVOF-sprayed Cr3C2-NiCr coating was characterized at each step by scanning electron microscopy. Wear testing was performed with a pin-on-disk tester. Wear weight loss was examined by applying different loads over a 9048.96 m sliding distance. Experimental results show that the wear resistance of the coated sample reduced …
The Use Of Additive Manufacturing For Cubesat Design And Testing, Jeremy Straub, Ronald Marsh, Scott Kerlin
The Use Of Additive Manufacturing For Cubesat Design And Testing, Jeremy Straub, Ronald Marsh, Scott Kerlin
Jeremy Straub
In developing a small spacecraft, the integration of numerous systems in a small area is a key challenge. It is easy to overlook how various component parts will integrate or have multiple sub-groups utilize un-filled space without realizing that they are creating a resource conflict. Additionally, the manufacturability of the final design is a key consideration. For all of these reasons, developing low-cost and incremental prototypes is a engineering ‘best practice’ for small spacecraft development.
Thermal Characteristic Reliability Of Fatty Acid Binary Mixtures As Phase Change Materials (Pcms) For Thermal Energy Storage Applications
Faculty of Engineering University of Malaya
The thermal characteristic reliability of two binary mixtures of fatty acid, myristic acid/palmitic acid/ sodium myristate (MA/PA/SM) and myristic acid/palmitic acid/sodium palmitate (MA/PA/SP), were investigated using a thermal cycling test setup for 0, 1000, 2000, 3000, and 3600 heating/cooling cycles. The changes in thermal properties and chemical bonding of both eutectic PCMs were measured using Differential Scanning Calorimetric (DSC) and Fourier Transform Infrared Spectroscopy (FT-IR) analyzer, respectively. MA/PA/SM and MA/PA/SP eutectic mixtures shows only minor changes in phase transition temperature (Tin, Ts) and in latent heat of fusion (ilk). Moreover, the chemical bonding structures of these eutectic PCMs show no …
Evaluation Techniques And Improvements Of Adhesion Strength For Tin Coating In Tool Applications: A Review
Faculty of Engineering University of Malaya
The adhesion between coating-substrate systems is an important factor in determining the performance and durability of coated engineering components. This paper reviews the microstructures and adhesion strength of titanium nitride (TiN) coating produced using two different processing methods: chemical vapor deposition and physical vapor deposition. Three methods to evaluate the adhesion strength of the coatings, namely the indentation test, laser spallation technique, and scratch test are presented and discussed in terms of their working principles, their advantages and disadvantages. The extrinsic and intrinsic factors influencing the adhesion strength of coating-substrate system, particularly for TiN coating, are also elaborated. The mechanisms …
Effect Of Pipe Configurations On Air Entrainment Into A Louvered Cylindrical Pipe: A Comparison Between Open And Close Entrance Of A Pipe, Innovative Research Publications Irp India, S.R. Sahu, D. P. Mishra
Effect Of Pipe Configurations On Air Entrainment Into A Louvered Cylindrical Pipe: A Comparison Between Open And Close Entrance Of A Pipe, Innovative Research Publications Irp India, S.R. Sahu, D. P. Mishra
Innovative Research Publications IRP India
The present numerical study was performed by solving conservation equations of mass, momentum and energy along with two equation based k-ɛ model for a louvered horizontal cylindrical pipe by finite volume method. It was found that pipe air suction increased with increase in opening area and number of nozzles for both pipe configurations. Increasing the pipe diameter made air suction more effective in pipe configuration B (open entrance of the pipe)
Cfd Simulation Of Swirling Effect In S-Shaped Diffusing Duct By Swirl Angle Of 30°, Innovative Research Publications Irp India, Ramazan
Cfd Simulation Of Swirling Effect In S-Shaped Diffusing Duct By Swirl Angle Of 30°, Innovative Research Publications Irp India, Ramazan
Innovative Research Publications IRP India
The present study involves the CFD analysis for the prediction of swirl effect on the characteristics of a steady, incompressible flow through an S-shaped diffusing duct. The curved diffuser considered in the present case has S-shaped diffusing duct having an area ratio of 1.9, length of 300 mm and turning angle of 22.5°/22.5°. The static pressure, total pressure, velocity and turbulence intensity were accounted. The improvement is observed for both, clockwise and anticlockwise swirl, the improvement being higher for clockwise swirl. Flow uniformity at the exit is more uniform for clockwise swirl at the inlet.
Driving Force For Binary Alloy Solidification Under Far From Local Equilibrium Conditions, Sergey Sobolev
Driving Force For Binary Alloy Solidification Under Far From Local Equilibrium Conditions, Sergey Sobolev
Sergey Sobolev
No abstract provided.
Finite Element Modelling Of Modular Precast Composites For Railway Track Support Structure – A Battle To Save Sydney Harbour Bridge, Dane Griffin, Olivia Mirza, Kenny Kwok, Sakdirat Kaewunruen
Finite Element Modelling Of Modular Precast Composites For Railway Track Support Structure – A Battle To Save Sydney Harbour Bridge, Dane Griffin, Olivia Mirza, Kenny Kwok, Sakdirat Kaewunruen
Sakdirat Kaewunruen
Railway networks in Australian alone require replacing a large amount of aging timber components in excess of 280,000 m3 per year. The replacement of timber track components is responsible for producing greenhouse gas emissions 6 times greater than equivalent reinforced concrete counterparts. Sydney Harbour Bridge presently experiences similar problem. A feasibility study to develop an innovative solution for the replacement of aging timber transoms installed on the Sydney Harbour Bridge was conducted to evaluate environmental, safety and financial benefits. The development of alternative composite structure to replace the timber components overcomes some potential compatibility issues with track stiffness as well …
Modeling And Experiment Of Solar Crop Dryer For Rural Application, Dawit Abay Tesfamariam, Mulu Bayray Kahsay, Meseret Tesfay Kahsay, Ftwi Yohaness Hagos
Modeling And Experiment Of Solar Crop Dryer For Rural Application, Dawit Abay Tesfamariam, Mulu Bayray Kahsay, Meseret Tesfay Kahsay, Ftwi Yohaness Hagos
Ftwi Yohaness Hagos
An indirect passive convectional solar dryer consisting of a solar air heater and dryer chamber is designed, manufactured and tested for its performance. It plays a major role in reducing crop wastage and opens a way to food preservation. The area of the solar collector required to dry a batch of 10 kg of tomato within two days is calculated. The performance of the collector is improved through the use corrugated absorber to create turbulence for air flow and a highly insulating material to minimize heat losses. The thermal performance of the solar dryer is tested under the local weather …
Effect Of N-Butanol And Diethyl Ether As Oxygenated Additives On Combustion-Emission-Performance Characteristics Of A Multiple Cylinder Diesel Engine Fuelled With Diesel-Jatropha Biodiesel Blend
Faculty of Engineering University of Malaya
Jatropha biodiesel is considered as one of the most prospective renewable energy sources of Malaysia in recent years. Hence, an investigation was conducted for the improvement of jatropha biodiesel-diesel blend with the addition of 5-10% n-butanol and diethyl ether by vol. which are commonly known as oxygenated cold starting additive. Engine tests were conducted at variable speed, ranging from 1000 rpm to 3000 rpm at constant 80 N m torque on a 4-cylinder turbocharged indirect injection diesel engine. Engine performance parameters like brake specific fuel consumption, brake specific energy consumption, brake thermal efficiency and engine emissions like carbon monoxide, unburned …
A Combination Of Computational Fluid Dynamics (Cfd) And Adaptive Neuro-Fuzzy System (Anfis) For Prediction Of The Bubble Column Hydrodynamics
Faculty of Engineering University of Malaya
This paper shows a combination of computational fluid dynamics (CFD) and adaptive neuro-fuzzy inference system (ANFIS) to propose a new viewpoint for multiphase flow modeling, including the accuracy of soft computing techniques in the prediction of a three dimensional (3D) bubble column reactor. Since there are some difficulties (i.e., high computational time in numerical methods and expensive equipment in experimental techniques) in predicting bubble column reactors, particularly at different column locations and various operation conditions, soft computing methods can be developed as a favorable replacement for conventional measurement and prediction techniques. This study employs CFD beside the ANFIS method to …
Multiple-Objective Optimization In Precision Laser Cutting Of Different Thermoplastics
Multiple-Objective Optimization In Precision Laser Cutting Of Different Thermoplastics
Faculty of Engineering University of Malaya
Thermoplastics are increasingly being used in biomedical, automotive and electronics industries due to their excellent physical and chemical properties. Due to the localized and non-contact process, use of lasers for cutting could result in precise cut with small heat-affected zone (HAZ). Precision laser cutting involving various materials is important in high-volume manufacturing processes to minimize operational cost, error reduction and improve product quality. This study uses grey relational analysis to determine a single optimized set of cutting parameters for three different thermoplastics. The set of the optimized processing parameters is determined based on the highest relational grade and was found …
Characterization Of Nickel-Doped Biphasic Calcium Phosphate/Graphene Nanoplatelet Composites For Biomedical Application
Faculty of Engineering University of Malaya
The effect of the addition of an ionic dopant to calcium phosphates for biomedical applications requires specific research due to the essential roles played in such processes. In the present study, the mechanical and biological properties of Ni-doped hydroxyapatite (HA) and Ni-doped HA mixed with graphene nanoplatelets (GNPs) were evaluated. Ni (3 wt.% and 6 wt.%)-doped HA was synthesized using a continuous precipitation method and calcined at 900 degrees C for 1 h. The GNP (0.5-2 wt.%)-reinforced 6% Ni-doped HA (Ni6) composite was prepared using rotary ball milling for 15 h. The sintering process was performed using hot isostatic pressing …
Development Of A Control System For Artificially Rehabilitated Limbs: A Review
Development Of A Control System For Artificially Rehabilitated Limbs: A Review
Faculty of Engineering University of Malaya
Development of an advanced control system for prostheses (artificial limbs) is necessary to provide functionality, effectiveness, and preferably the feeling of a sound living limb. The development of the control system has introduced varieties of control strategies depending on the application. This paper reviews some control systems used for prosthetics, orthotics, and exoskeletons. The advantages and limitations of different control systems for particular applications have been discussed and presented in a comparative manner to help in deciding the appropriate method for pertinent application. Link to Full-Text Articles : http://link.springer.com/article/10.1007/s00422-014-0635-1
Eggshells: A Novel Bio-Filler For Intumescent Flame-Retardant Coatings
Eggshells: A Novel Bio-Filler For Intumescent Flame-Retardant Coatings
Faculty of Engineering University of Malaya
The aim of this study was to develop intumescent flame-retardant coatings that incorporate chicken eggshell (CES) waste as a novel eco-friendly bio-filler. Three flame-retardant additives, namely, ammonium polyphosphate phase II, pentaerythritol and melamine were mixed with flame-retardant fillers and acrylic binder to synthesize the intumescent coatings. The fire performance of the coatings was evaluated in accordance with 'BS 476: Part 6-Fire Propagation' and 'BS 476: Part 7-Surface Spread of Flame' test standards. It was found that 4 out of 5 of the coated specimens (B, C, D and E) neither showed surface spread of flame nor any afterglow combustion upon …
Effects Of Engine Variables And Heat Transfer On The Performance Of Biodiesel Fueled Ic Engines
Effects Of Engine Variables And Heat Transfer On The Performance Of Biodiesel Fueled Ic Engines
Faculty of Engineering University of Malaya
These days internal combustion engines are the major source of transportation. They run mainly on fossil fuels which are depleting day by day not only that they cause pollution which endangers human life and creates environmental problems. Of late biodiesel has emerged as a better alternative fuel for internal combustion engines due to its comparable properties with that of fossil fuels. Today's automobiles require economy of operation, high power output and last but not the least, reduction in greenhouse gases emitted by the vehicles. Such specific demands have compelled the researchers not only to focus on the parameters affecting the …
Growth And Characterization Of The Oxide Scales And Core/Shell Nanowires On Ti-6al-4 V Particles During Thermal Oxidation
Faculty of Engineering University of Malaya
Nanowires were grown on as-received and milled particles of Ti-6Al-4 V (Ti64) alloy under an optimum condition of 750 degrees C in an Ar atmosphere containing 15 ppm of oxygen. The as-grown nanowires and the underneath oxide scales developed on Ti64 particles were characterized by X-ray diffiactometry (XRD), field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) equipped with energy dispersive X-ray spectroscope (EDS). Results revealed the formation of oxide scales consisting of double layers on the surface of Ti64 particles. The outer oxide scale was a mixture of Al2O3 …
Tailoring Zno Nanostructures By Spray Pyrolysis And Thermal Annealing
Tailoring Zno Nanostructures By Spray Pyrolysis And Thermal Annealing
Faculty of Engineering University of Malaya
We report a novel synthesis of ZnO nanorods with hexagonal pyramid-like heads by a simple and low cost technique of spray pyrolysis with the help of zinc acetate and tin (IV) chloride pentahydrate precursors. In the present study, the growth of ZnO nanorods is optimized by varying a number of sprays and annealing temperatures in the synthesis process. FESEM analysis reveals that ZnO nanorods are observed when the number of sprays exceeds 150 and film-like structure is observed below 150 sprays. Nanorods are formed when the molar ratio of zinc acetate to tin (IV) chloride pentahydrate in the solution mixture …
Temperature Dependence Of Raman Scattering In 4h-Sic Films Under Different Growth Conditions
Temperature Dependence Of Raman Scattering In 4h-Sic Films Under Different Growth Conditions
Faculty of Engineering University of Malaya
The microRaman scattering of 4H-SiC films, fabricated by low pressure chemical vapor deposition under different growth conditions, is investigated at temperatures ranging from 80K to 550 K. The effects of growth conditions on E-2(TO), E-1(TO) and A(1)(LO) phonon mode frequencies are negligible. The temperature dependences of phonon linewidth and lifetime of E2(TO) modes are analyzed in terms of an anharmonic damping effect induced by thermal and growth conditions. The results show that the lifetime of E-2(TO) mode increases when the quality of the sample improves. Unlike other phone modes, Raman shift of A(1) (longitudinal optical plasma coupling (LOPC)) mode does …
Influence Of Biodiesel Blending On Physicochemical Properties And Importance Of Mathematical Model For Predicting The Properties Of Biodiesel Blend
Faculty of Engineering University of Malaya
The growing demand for green world serves as one of the most significant challenges of modernization. Requirements like largest usage of energy for modern society as well as demand for friendly milieu create a deep concern in field of research. Biofuels are placed at the peak of the research arena for their underlying benefits as mentioned by multiple researches. Out of a number of vegetable oils, only a few are used commercially for biodiesel production. Due to various limitations of edible oil, non-edible oils are becoming a profitable choice. Till today, very little percentage of biodiesel is used successfully in …