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Articles 22891 - 22920 of 27397

Full-Text Articles in Engineering

Applied Methodology For Computational Formulation In International Expansion Strategy Of Taiwanese Semiconductor Industry, Cher-Min Fong, Hoang Linh Nguyen Aug 2011

Applied Methodology For Computational Formulation In International Expansion Strategy Of Taiwanese Semiconductor Industry, Cher-Min Fong, Hoang Linh Nguyen

Journal of Marine Science and Technology–Taiwan

This study seeks to contribute to entry mode literature by introducing the concept of “corporate culture diversity”. Compared to multinational enterprises (MNEs) from developed countries, Taiwan’s MNEs have shorter history of internationalization. Therefore, international learning is critical to their entry modes. We examined an original determinant of entry mode choice, proposed and tested the operationalization for a new theoretical construct, namely “corporate culture diversity”. Hypotheses were developed on the entry modes in relation to cultural diversity of a firm’s international experience, a step beyond the conventional theory of how national cultural differences influence the international expansion strategy. The hypotheses were …

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An Integrated Quantitative Risk Analysis Method For Major Construction Accidents Using Fuzzy Concepts And Influence Diagram, Yong-Huang Lin, Chen-Chung Lin, Yaw-Yauan Tyan Aug 2011

An Integrated Quantitative Risk Analysis Method For Major Construction Accidents Using Fuzzy Concepts And Influence Diagram, Yong-Huang Lin, Chen-Chung Lin, Yaw-Yauan Tyan

Journal of Marine Science and Technology–Taiwan

The accident factor identification and risk assessment is an essential requirement for prevention of major construction accidents in the construction project process. An integrated quantitative risk assessment (IQRA) method has been proposed in this paper to overcome the problems of difficult to quantify accident probability for construction industry. The proposed approach employs influence diagram and fuzzy theory to estimate accident probability and to deal with the imprecision inherent to the process of subjective judgment. A case study that evaluates accident probability of diaphragm wall collapse is presented to illustrate the use of this methodology and to demonstrate its capability.

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Experimental Analysis For Thermal Performance Of A Vapor Chamber Applied To High-Performance Servers, Rong-Tsu Wang, Jung-Chang Wang, Tien-Li Chang Aug 2011

Experimental Analysis For Thermal Performance Of A Vapor Chamber Applied To High-Performance Servers, Rong-Tsu Wang, Jung-Chang Wang, Tien-Li Chang

Journal of Marine Science and Technology–Taiwan

This article conducts experimental analysis using the window program VCTM V1.0 to investigate the thermal performance of a vapor chamber and then applies the findings to a high-performance server. The experimental method is derived from a novel formula for the effective thermal conductivity of a vapor chamber and functions to calculate its thermal performance. Results show that the maximum heat flux is over 100 W/cm2 , and the effective thermal conductivity is many times higher than the copper heat spreaders. The maximum effective thermal conductivity is 870 W/m°C according to the novel formula, and comparing it with the experimental value, …

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A Generalized Approach To The Solution Of One-Dimensional Stock-Cutting Problem For Small Shipyards, Ahmet Cemil Dikili, Baris Barlas Aug 2011

A Generalized Approach To The Solution Of One-Dimensional Stock-Cutting Problem For Small Shipyards, Ahmet Cemil Dikili, Baris Barlas

Journal of Marine Science and Technology–Taiwan

A generalized approach is introduced for the optimization of one-dimensional cutting stock problem (1D-CSP), which occurs in wide variety of engineering manufacturing processes especially in ship building industry. Instead of making preliminary specifications and accordingly ignoring many alternative arrangements, the suggested optimization technique selectively considers feasible arrangements by eliminating majority of the possible but inefficient arrangements thus rendering the problem solvable for practical applications. The introduced approach, which minimizes the piece arrangement plans and trim losses in the material, achieves the ideal solution implied by the analytical methods. Another important advantage of the present method is its ability to produce …

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Experimental And Numerical Study On The Flow Visualization In A Tri-Helical Static Mixer, Kuo-Tung Chang, Jer-Huan Jang, Teng-Chuang Lai, Jun-Nan Chen Aug 2011

Experimental And Numerical Study On The Flow Visualization In A Tri-Helical Static Mixer, Kuo-Tung Chang, Jer-Huan Jang, Teng-Chuang Lai, Jun-Nan Chen

Journal of Marine Science and Technology–Taiwan

In this work, the flow visualization in a tri-helical static mixer has been investigated in detailed both experimentally and numerically. The static mixer used for the present study consists of four elements with a series of alternating left and right helical elements. Each element has the aspect ratio of 1.5 (i.e., L/D = 1.5) and twisted angle of 180°. The objective of this investigation is mainly to explore the flow pattern inside a tri-helical static mixer due to its novelty and originality. It is clearly observed that the flows at the trailing edge for both numerical and experimental results are …

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Investigating The Safety Cognition Of Taiwan's Construction Personnel, Wei Tong Chen, Chun Sheng Lu, Ying-Hua Huang Aug 2011

Investigating The Safety Cognition Of Taiwan's Construction Personnel, Wei Tong Chen, Chun Sheng Lu, Ying-Hua Huang

Journal of Marine Science and Technology–Taiwan

A high construction accident rate is related to failures in the implementation of safety management. The rate of occupational injuries of Taiwan construction industry is higher than the ones of the developed counties. Knowledge and reinforcement of safety cognition for construction personnel are critical to improve safety performance in construction. In this study, a safety cognition evaluation scale is developed to measure the safety cognition of construction personnel in Taiwan. The safety cognition of construction personnel was ranked in descending order of safety engineers, contractor-related personnel, and design/audit personnel. The aspect of accident statistics has the smallest cognition differences while …

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Boundary Element Analysis Of Thin Structural Problems In 2d Elastostatics, Yao-Ming Zhang, Yan Gu, Jeng-Tzong Chen Aug 2011

Boundary Element Analysis Of Thin Structural Problems In 2d Elastostatics, Yao-Ming Zhang, Yan Gu, Jeng-Tzong Chen

Journal of Marine Science and Technology–Taiwan

Thin structures, such as thin films and coatings, have been widely designed and utilized in many industries recently. However, the widespread experimental research in thin structural problems underlies a general lack of modeling efforts which can accurately and efficiently predict their performance. In this paper, the boundary element method (BEM) based on elasticity theory is developed for two-dimensional (2D) thin structures with the thickness to length ratio in the micro (10-6) or nano (10-9) scales. The BEM-based approach proposed in this paper is constructed using a combination of the regularized indirect boundary integral equations (BIEs) and a general nonlinear transformation …

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Improvement Of Biophysical Micromixer Design, Chin-Tsan Wang, Tzu-Yang Hu Aug 2011

Improvement Of Biophysical Micromixer Design, Chin-Tsan Wang, Tzu-Yang Hu

Journal of Marine Science and Technology–Taiwan

In a passive micro-scale mixer, the complete mixing of two or more fluids within a reasonable time period plays an important role. Microfluidic transportation and effective mixing are of importance and require examination. The biophysical micromixer addressed by authors would be utilized because of its excellent ability to enlarge the interface and reduce the diffusion length during the mixing process. Here, the mixing efficiency, pressure drop and Aspect ratio (AR) at an optimal inlet Reynolds ratio will be studied. Some useful results will be addressed: First, the dimensions of AX, GX, GY, FX, HX, HY and J would be effective …

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A Truly-Meshless Galerkin Method, Through The Mlpg "Mixed" Approach, Zhidong Han, Satya N. Atluri Aug 2011

A Truly-Meshless Galerkin Method, Through The Mlpg "Mixed" Approach, Zhidong Han, Satya N. Atluri

Journal of Marine Science and Technology–Taiwan

A truly meshless Galerkin method is formulated in the present study, as a special case of the general Meshless Local Petrov-Galerkin (MLPG) “Mixed” approach. The Galerkin method is implemented as a truly meshless method, for solving elasto-static problems. In the present Galerkin method, the test function is chosen to be the same as the trial function, as a special case of the MLPG approach. However, the MLPG local weak form is written over a local sub-domain which is completely independent from the trial or test functions. Even though in the present Galerkin approach, the trial and test functions are the …

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Characterization Of Key Process Parameters In Injection Blow Molding For Improving Quality, Aspen D'Costa Aug 2011

Characterization Of Key Process Parameters In Injection Blow Molding For Improving Quality, Aspen D'Costa

Online Journal for Workforce Education and Development

The purpose of this study was to discover the performance of significant process parameters in manufacturing 20 oz. plastic beverage bottles. An experimental methodology was carefully designed to examine the characteristics of key variables such as ambient and operating temperatures, process line operators, resin types, resin colors and operating lines associated with a plastic bottle manufacturing line. More explicitly, this study seeks to identify the definitive relationship between the selected process parameters for the production machine (Sidel™) and the ensuing product quality. Also, this study was conducted to evaluate the performance characteristics of Post Consumer Resin (PCR), virgin resin and …

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53rd Rocky Mountain Conference On Analytical Chemistry Jul 2011

53rd Rocky Mountain Conference On Analytical Chemistry

Rocky Mountain Conference on Magnetic Resonance

Final program, abstracts, and information about the 53rd annual meeting of the Rocky Mountain Conference on Analytical Chemistry, co-endorsed by the Colorado Section of the American Chemical Society and the Society for Applied Spectroscopy. Held in Snowmass, Colorado, July 24-28, 2011.

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Do Wind Turbines Affect Weather Conditions?: A Case Study In Indiana, Meghan F. Henschen, Brittany Herrholtz, Lacey Rhudy, Kathryn Demchak, Brian Doogs, Joshua Holland, Erik Larson, Johnny Martin, Matthew Rudkin Jul 2011

Do Wind Turbines Affect Weather Conditions?: A Case Study In Indiana, Meghan F. Henschen, Brittany Herrholtz, Lacey Rhudy, Kathryn Demchak, Brian Doogs, Joshua Holland, Erik Larson, Johnny Martin, Matthew Rudkin

The Journal of Purdue Undergraduate Research

Wind turbines are becoming increasingly widespread in the United States as the world looks for cleaner sources of energy. Scientists, policymakers, and citizens have strong opinions regarding the positive and negative effects of wind energy projects, and there is a great deal of misinformation about wind energy circulating on the Web and other media sources. The purpose of this study is to gain a better understanding of how the rotation of hundreds of turbines can influence local weather conditions within a wind farm and in the surrounding areas. This experiment measures temperature, atmospheric pressure, wind speed, wind direction, relative humidity, …

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The Future Of Aerospace Propulsion: Visco-Elastic Non-Newtonian Liquids, Nicole Arockiam Jul 2011

The Future Of Aerospace Propulsion: Visco-Elastic Non-Newtonian Liquids, Nicole Arockiam

The Journal of Purdue Undergraduate Research

Aerospace propulsion often involves the spray and combustion of liquids. When a liquid is sprayed, large drops form first, in a process known as primary atomization. Then, each drop breaks up into smaller droplets, in a process known as secondary atomization. This determines final drop sizes, which affect the liquid’s evaporation and mixing rates and ultimately influence combustor efficiency. Little has been published concerning the secondary atomization of visco-elastic non-Newtonian liquids, such as gels. These substances have special potential as aerospace propellants, because they are safer to handle than their Newtonian liquid counterparts, such as water. Additionally, they can be …

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Development Of Composition Modulated Multilayer Alloy Coatings And Their Corrosion Behavior, S Yogesha, A C. Hegde Jul 2011

Development Of Composition Modulated Multilayer Alloy Coatings And Their Corrosion Behavior, S Yogesha, A C. Hegde

Journal of Metals, Materials and Minerals

Multilayer Zn-Ni alloy coating was developed on mild steel from acid chloride bath containing thiamine hydrochloride, as additive. Composition modulated multilayer alloy (CMMA) coatings, or simply, multilayer coating with gradual change in composition were developed galvanostatically using triangular current pulses from single bath technique. CMMA coatings of Zn-Ni were developed under different conditions, such as cyclic cathode current densities (CCCDs) and a number of layers, and their corrosion behaviors were evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy method. Optimal configuration, (Zn-Ni)2.0/4.0/600 was found to exhibit ~50 times better corrosion resistance compared to monolayer (Zn-Ni)3.0 alloy, deposited from the same …

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Chevron Crack Initiation In Mullti-Pass Drawing Of Inclusion Copper Shaped-Wire, S Norasethasopon Jul 2011

Chevron Crack Initiation In Mullti-Pass Drawing Of Inclusion Copper Shaped-Wire, S Norasethasopon

Journal of Metals, Materials and Minerals

In the copper superfine wire drawing, the internal cracks such as chevron cracks and breakage of the wire were fatal to the success of quantitative drawing operations. This paper shows how the main process parameters, the drawing pass numbers, influence the plastic deformation, hydrostatic stress, maximum principal tensile stress and chevron cracks initiation investigated by FEM simulation. The effect of the lateral and longitudinal sizes of a central cylindrical inclusion in the multi-pass copper shaped-wire drawing was studied. The plastic deformation, plastic strain, hydrostatic stress and maximum principal tensile stress of the copper shaped-wire containing an inclusion were obtained from …

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Improving Quench Hardening Of Low Carbon Steel, T Korad, M Polboon, N Chumchery, J Pearce Jul 2011

Improving Quench Hardening Of Low Carbon Steel, T Korad, M Polboon, N Chumchery, J Pearce

Journal of Metals, Materials and Minerals

The carbon content in steel determines whether it can be directly hardened. If the carbon content is low (less than 0.25wt%) then an alternate means exists to increase the carbon content of the surface. In this study, the mixed quenchant consisting of brine and surfactants known as Superquench was applied in the quench-hardening process on AISI 1015 low carbon steel. The quench results were compared with quenching in heavy brine solution, water and oil which are recognized as the basic quenchants and cannot cause bulk-hardening low-carbon steels. The hardness tests on different points along the radius of cut round bar …

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Immobilization Of Lipase Onto Cyperus Papyrus L. For Biodiesel Production By Transesterification And Hydrolysis-Esterification, S Charuchinda, P Suthianthong, W Chulalaksananukul Jul 2011

Immobilization Of Lipase Onto Cyperus Papyrus L. For Biodiesel Production By Transesterification And Hydrolysis-Esterification, S Charuchinda, P Suthianthong, W Chulalaksananukul

Journal of Metals, Materials and Minerals

Lipase of Candida rugosa was immobilized on biomass support, plant fiber from Cyperus papyrus L., for biodiesel synthesis. The two immobilization techniques investigated in this study were physical adsorption and covalent binding with 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC). Results showed that the prepared immobilized lipase by physical adsorption with adding heptane presented higher protein loading, lipase activity and degree of immobilization than that by physical adsorption in phosphate buffer solution and by covalent binding. This immobilized lipase was further applied as biocatalyst for biodiesel synthesis by transesterification and hydrolysis-esterification. The results showed that this immobilized lipase preferred to hydrolyze triglyceride in palm oil …

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Self-Crack Closing Ability Of Mortar With Different Additives, D Jaroenratanapirom, R Sahamitmongkol Jul 2011

Self-Crack Closing Ability Of Mortar With Different Additives, D Jaroenratanapirom, R Sahamitmongkol

Journal of Metals, Materials and Minerals

Self-crack closing ability of cementitious materials has been studied in various aspects. However, most studies focus mainly on the cementitious material with only cement as a binder (without mineral additives), although many additives are commonly used at present. This research thus aims to investigate the effect of additives on this self-crack closing ability by observing and measuring crack width on the mortar specimens. Cracks were created on mortar specimens by splitting method at the age of 3 and 28 days. As most reports show that the best self-crack closing performance was achieved when a plenty of water was supplied, the …

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Determination Of Forming Limit Stress Diagram For Formability Prediction Of Spce 270 Steel Sheet, S Panich, V Uthaisangsuk, J Juntaratin, S Suranuntchai Jul 2011

Determination Of Forming Limit Stress Diagram For Formability Prediction Of Spce 270 Steel Sheet, S Panich, V Uthaisangsuk, J Juntaratin, S Suranuntchai

Journal of Metals, Materials and Minerals

The aim of this research is to apply numerical Finite Element Method (FEM) for determining Forming Limit Stress Diagram (FLSD) of sheet steel of grade SPCE 270. As a failure criterion for formability prediction in sheet metal forming process, the conventional Forming Limit Diagram (FLD) is often used. The FLD is a strain based criterion, by which the principal strains at failure are evaluated. Many investigations showed that the FLD is dependent on forming history and strain path. However, the stress based criterion does not confirm this dependency. This criterion is more robust against any changes in the strain path …

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The Change Of Surface Alloy Compositions And Corrosion Behavior After Wedm Machining Of Commercially Pure Titanium (Grade 4) And Ti-6al-4v (Grade 5), K Sriprasertying, S Rhaiphu Jul 2011

The Change Of Surface Alloy Compositions And Corrosion Behavior After Wedm Machining Of Commercially Pure Titanium (Grade 4) And Ti-6al-4v (Grade 5), K Sriprasertying, S Rhaiphu

Journal of Metals, Materials and Minerals

Nowadays, titanium and its alloys are widely used in medical applications because of excellent corrosion resistance and a high strength-to-weight ratio. Nevertheless, titanium and its alloys are classified as difficult-to-machine metals by conventional machining methods. Therefore, unconventional machining processes are recommended. Wire-electrical discharge machining (WEDM) has become an important non-traditional machining process, as it provides an effective solution for machining components made from difficult-to-machine metals. However, WEDM could damage the surface layer and have an effect on the biocompatibility properties. This research was focused on the effect of WEDM on grade 4 commercially pure titanium and Ti-6Al-4V (Grade 5) after …

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Modification Of Montmorillonite With A Cationic Softener For Finishing Cotton Fabric With Hand Builder Performance, S Kittinaovarat, N Jiratumnukul, N Koolpreechanan Jul 2011

Modification Of Montmorillonite With A Cationic Softener For Finishing Cotton Fabric With Hand Builder Performance, S Kittinaovarat, N Jiratumnukul, N Koolpreechanan

Journal of Metals, Materials and Minerals

Montmorillonite (Mont) was modified by cationic exchange with the cationic softener TEGO 28 (Di-Palm carboxyethyl hydroxyethyl methyl ammonium methosulfate). XRD analysis suggested that intercalation occurred in the modified Mont (mMont). Softening finishing solutions composed of pure TEGO 28 with and without mMont were treated on cotton fabrics by the pad-dry method and then evaluated for stiffness, whiteness, tear strength and thermal stability. TEGO 28 treatment alone increased the stiffness property of the finished fabrics, and this was increased further by the co-inclusion of mMont at 3 and 5% (w/v), but higher or lower mMont concentrations led to a marked and …

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Chitosan And Trimethyl Chitosan Particles As Oral Vaccine Delivery Systems: Comparison Of The Potential To Initiate Immune Responses, S Boontha, H Ej Unginger, N Waranuch, A Polnok, T Pitaksuteepong Jul 2011

Chitosan And Trimethyl Chitosan Particles As Oral Vaccine Delivery Systems: Comparison Of The Potential To Initiate Immune Responses, S Boontha, H Ej Unginger, N Waranuch, A Polnok, T Pitaksuteepong

Journal of Metals, Materials and Minerals

In this study, particles having low MW (Chi-L), high MW (Chi-H) and their respective trimethyl chitosan (TMC) with a degree of quaternization (DQ) of about 40% (TMC-L-40 and TMC-H-40), and prepared by using chitosan, were used to compare their potentials for provoking immune responses to ovalbumin (OVA) following oral administration. The results showed that the Chi-L particles gave higher serum immunoglobulin G (IgG) responses to OVA than those induced with Chi-H, TMC-L-40 and TMC-H-40 particles. However, Chi-L and Chi-H particles gave similar secretory immunoglobulin A (sIgA) to OVA, and sIgA titers obtained from mice immunized with OVA-loaded TMC were negligible. …

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Purification Of An Industrial Aluminum Alloy By Melt Stirring During Ohno Continuous Casting Process, S Fashu, L Jianguo, H Q. Dan Jul 2011

Purification Of An Industrial Aluminum Alloy By Melt Stirring During Ohno Continuous Casting Process, S Fashu, L Jianguo, H Q. Dan

Journal of Metals, Materials and Minerals

With the purpose of upgrading the purity of a dilute industrial aluminum alloy during Ohno Continuous Casting (OCC) process through the use of forced melt stirring; the critical stirring intensity required under a casting speed of 2 mm/min was numerically determined. The determined critical stirring intensity induces convective velocity magnitudes into the melt which are effective in transporting solutes from the solute boundary layer into the bulk melt. It was found that, with adequate melt stirring, production of substantially long and high purity ingots during OCC is possible before their purity diminishes to lower than the initial alloy purity.

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Design And Construction Of Water Atomizer For Making Metal Powder, S Yenwiset, T Yenwiset Jul 2011

Design And Construction Of Water Atomizer For Making Metal Powder, S Yenwiset, T Yenwiset

Journal of Metals, Materials and Minerals

Water Atomization for metal powder is an appropriate method for producing metal powder from different kinds of metal. Typically, a water atomizing machine is designed with a molten metal spraying chamber in a vertical or horizontal orientation depending on a nozzle design, a molten metal spraying chamber and related components. The main variables influencing the working condition of the water atomization process, which affect sizes, shapes and distribution of metal powder particles, are water pressure, water flow rate, a temperature higher than melting point of liquid metal and flow rate of liquid metal. The water atomizing machine in the study …

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Effect Of Postweld Heat Treatment On Microstructures And Hardness Of Tig Weldment Between P22 And P91 Steels With Inconel 625 Filler Metal, N Tammasophon, W Homhrajai, G Lothongkum Jul 2011

Effect Of Postweld Heat Treatment On Microstructures And Hardness Of Tig Weldment Between P22 And P91 Steels With Inconel 625 Filler Metal, N Tammasophon, W Homhrajai, G Lothongkum

Journal of Metals, Materials and Minerals

This research aims at searching for the optimal postweld heat treatment condition of the TIG weld joint between P22 (2.25Cr) and P91 (9Cr) steels using Inconel 625 as filler metal. The postweld heat treatment at 750C for 2, 4 and 6 hours was applied in order to reach the proper microstructure and hardness for high performance in mechanical properties at elevated temperatures. It is recommended that postweld heat treatment at 750C for 2 hours is the proper condition to reduce the hardness of heat affected zone (HAZ) of P91 steel.

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Applying Computer Simulation In Improving Heat Treating Condition Of Thin High-Carbon Steel Parts, T Korad, M Polboon, N Chumchery, J Pearce Jul 2011

Applying Computer Simulation In Improving Heat Treating Condition Of Thin High-Carbon Steel Parts, T Korad, M Polboon, N Chumchery, J Pearce

Journal of Metals, Materials and Minerals

The study was carried out using COSMOSFlowWorks to predict heat treatment conditions for AISI 1085 high-carbon steel sheet that is used to produce automotive parts that require wear resistance and stiffness resulting from controlled moderately high hardness levels. To achieve such properties, flat high-carbon steel parts need to be hardened to produce acicular matrix structures, and the most suitable heat treatment process to harden thin parts without distortion is austempering. In producing hard and stiff thin section parts in this company study the austempering process was performed by soaking at 830C and then quenching in a NaCl salt bath at …

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Effect Of Nitrogen Partial Pressure On Characteristic And Mechanical Properties Of Hard Coating Tialn Film, C Chokwatvikul, S Larpkiattaworn, S Surinphong, C Busabok, P Termsuksawad Jul 2011

Effect Of Nitrogen Partial Pressure On Characteristic And Mechanical Properties Of Hard Coating Tialn Film, C Chokwatvikul, S Larpkiattaworn, S Surinphong, C Busabok, P Termsuksawad

Journal of Metals, Materials and Minerals

(Ti,Al)N coating has been serving for the industry as cutting and forming tools. Compared with TiN film, TiAlN film significantly increases tool lifetime. Therefore, it reduces machine downtime and increases productivity. In this work, (Ti,Al)N film was deposited on cold-work tool steel (SKD 11) using PVD cathodic arc system. The sintered Ti-Al target with composition of (at%) 50 Ti and 50 Al was used as a cathode. The deposition bias voltage, bias arc current and deposition time were set at 100 V, 70 A and 90 minutes, respectively. Nitrogen gas was purged into the system with the applied pressure of …

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Study Conditions Of Aluminum Billets For Relationship Between Precipitated Phases And Homogenizing Temperature With Different Cooling Methods, U Phongsophitanan, M Polboon, N Chumchery Jul 2011

Study Conditions Of Aluminum Billets For Relationship Between Precipitated Phases And Homogenizing Temperature With Different Cooling Methods, U Phongsophitanan, M Polboon, N Chumchery

Journal of Metals, Materials and Minerals

In producing cast aluminum billets for using in extruded profile production, homogenization is one of the significant steps of the process. This project examined a suitable homogenizing temperature for usage in manufacturing besides common condition. Computerized fluid dynamics and image analysis solution were techniques to identify the relationship between the area fraction of precipitated phases and homogenizing temperature with different cooling methods. Temperature gradient pattern revealed that soaking temperatures at 575C and 565C are suitable conditions to be used in manufacturing. Furthermore, area fraction calculation showed that the area fractions of precipitated phases of each cooling method were not significantly …

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Bs News July/August Jul 2011

Bs News July/August

Building Services Engineering

No abstract provided.

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Corrosion Prevention Of Rebar In Concrete Due To Chloride, Y Srimahajariyaphong, S Niltawach Jul 2011

Corrosion Prevention Of Rebar In Concrete Due To Chloride, Y Srimahajariyaphong, S Niltawach

Journal of Metals, Materials and Minerals

In coastal and brackish areas, black rebar in concrete structures suffers from chloride corrosion which leads to spalling of the concrete. The Half Cell Potential Measurement technique has been applied to study the corrosion behavior of both black and galvanized deformed rebar in different concretes. Additives in the concretes vary from pozzolan, calcium nitrite, to pozzolan plus calcium nitrite. Rebar which has higher half cell potential possesses better corrosion resistance. It has been found that concrete cover thickness has no significant effect on the half cell potential of either rebar; that for both types of rebar, the half cell potential …

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