The Production Of Cast Metal Matrix Composite By A Modified Stir Casting Method

In a normal practice of stir casting technique, cast metal matrix composites (MMC) is produced by melting the matrix material in a vessel, then the molten metal is stirred thoroughly to form a vortex and the reinforcement particles are introduced through the side of the vortex formed. From some point of view this approach has disadvantages, mainly arising from the particle addition and the stirring methods. During particle addition there is undoubtedly local solidification of the melt induced by the particles, and this increase the viscosity of the slurry. A top addition method also will introduced air into the slurry which appears as air pockets between the particles. The rate of particle addition also needs to be slowed down especially when the volume fraction of the particles to be used increases. This is time consuming for a bigger product. This study propose a new approach of producing cast MMC. When all substances are placed in a graphite crucible and heated in an inert atmosphere until the matrix alloy is melted and then followed by a two-step stirring action before pouring into a mould has advantages in terms of promoting wettability between the silicon carbide particle and the A359 matrix alloy. The success of the incorporation of silicon carbide particles into the matrix alloy showed that the wettability between silicon carbide particles and mechanical properties such as hardness and tensile strength are comparable with previous data produced by other researchers

Maintenance management and servises (case study: PERKESO building's in penisular of Malaysia)

Maintenance Management and Services is a combination of several actions in which to retain or restore an item to perform its required action. PERTUBUHAN KESELAMATAN SOSIAL (PERKESO) as one of the semi government sector in Malaysia that has many assets, needs maintenance to prevent the assets from deterioration. Maintenance in PERKESO was monitor and control by Property Unit and Local PERKESO Office. There are two maintenance system presently implemented at PERKESO: Preventive maintenance and Corrective Maintenance. The maintenance and services in PERKESO are divided to two building type: stand alone building and shop lot building. Maintenance and services for stand alone PERKESO building is total preventive maintenance and services scope and for shop lot PERKESO building scope maintenance and services only cover cleaning, M&E preventive maintenance and Pest Control. Aim of this study to propose maintenance management & services system. To achieve the aim of this study, five objectives have been set, to study the maintenance management system presently implemented. To identify the common problem in maintenance management and services. To identify the tenant satisfactory level upon the maintenance and services implemented. To identify tenant opinion to make improvement for maintenance management and services. From the data analyze and propose maintenance management and services system. This research focused on PERKESO Building’s in Peninsular of Malaysia. To obtain the data the following knowledge acquisition methods were used by interview, questionnaire and archives. An interview were set for two session, pre-interview done before set questionnaire and interview after the analysis data had done Result of the study showed the responds of the end user customer for the overall building conditions and the services given is fair. To achieve the tenants’ satisfaction level, a new maintenance management system is proposed

Blogs of their own: a story of two Malaysian Women Bloggers

Over the last few years, with the introduction of easy-to-use and integrated services such as Windows Live Spaces, blogging has moved into the mainstream in Malaysia, with women making up 64% of bloggers. Blogging has become popular because it provides an outlet for netizens who find blogosphere a liberating place, so unlike Malaysian traditional print which is censored and licensed. This article is an analysis of two blogs written by Malaysian women that show them negotiating in contradictory ways the line between the private and public dimensions of their lives. The idea that the “personal is political” and the importance of experience still retain an important place in feminist contemporary thought. I argue that many seemingly “trivial and personal” issues have produced a politics formed from the bloggers‟ personal experiences and reflections

Menjana pemodulatan lebar denyut (PWM) penyongsang tiga fasa menggunakan pemproses isyarat digital (DSP)

Baru-baru ini, penyongsang digunakan secara meluas dalam aplikasi industri. Walaubagaimanapun, teknik Pemodulatan Lebar Denyut (PWM) diperlukan untuk mengawal voltan keluaran dan frekuensi penyongsang. Dalam tesis ini, untuk Pemodulatan Lebar Denyut Sinus Unipolar (SPWM) penyongsang tiga fasa adalah dicadang menggunakan Pemproses Isyarat Digital (DSP). Satu model simulasi menggunakan MATLAB Simulink dibangunkan untuk menentukan program Pemodulatan Lebar Denyut Sinus Unipolar (SPWM) Program ini kemudian dibangunkan dalam Pemproses Isyarat Digital (DSP) TMS320f28335. Hasilnya menunjukkan bahawa voltan keluaran penyongsang tiga fasa boleh dikendalikan

A review of cosmetic and personal care products: halal perspective and detection of ingredient

The term halal refers to what ispermitted by Islamic law. It is a basic need for Muslims and encompasses all materials used in everyday life including cosmetics.Muslims want to be assured that the ingredients,handling, processing, distribution, transportation and types of cosmetic used are halal compliant. The halalaspects of cosmetic and personal care products cover ingredients, all the processes involved in production right up to delivery to consumers, safety and product efficacy evaluations. In order to verify halal compliance of cosmetic products, a method of detecting halal and non-halal ingredients is very important and critically needed. Halal cosmetic standards, halal certification and the halal logo can be used as benchmarks for halal compliance. In view of the importance of cosmetic and personal care products from the halal perspective, this review will cover the halal principles, halal cosmetic and personal care products, ingredients, standard and certification as well as safety. The development of the process of detecting non-halal ingredients and authenticating halal ingredients for potential cosmetic applications in recent years are included in this paper