Skip Navigation LinksVolume : Volume 13 No.1 2004

  
  
  
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tool_life_and_wear_mechanism_of_p10_tin_carbide_tools_in_high_speed_end_milling_operations.pdfTOOL LIFE AND WEAR MECHANISM OF P10 TiN CARBIDE TOOLS IN HIGH SPEED END MILLING OPERATIONS
  
ABSTRACT:
Carbide inserts of P1 O ISO grades were evaluated in dry cutting end milling operations of AISI H13 tool steel. Experiments were conducted at various cutting speeds, and feed rates. Experimental results are presented and   discussed based on the insert's resistance to wear, and wear morphology at different combination of milling parameters. Tool performances are evaluated   based on the cutting time and surface finish produced which is controlled   predominantly by wear on the flank face. The longest tool life of 22 minutes is   achieved at low cutting speed and feed rate and uniform abrasive wear is   observed on the flank face. Whereas at higher combination of cutting speed and   feed rate, crater wear is observed on the rake face, thermal and mechanical   fatigues are observed on the flank face.     

KEYWORDS: TiN coated carbide inserts, wear mechanism, dry cutting, highspeed end milling. 

Author: J.A. Ghani, I.A. Choudhury, and H.H. Masjuki
Year: 2004
mass_transfer_performance_of_curve_blade_impeller_in_gas_liquid_mixing.pdfMASS TRANSFER PERFORMANCE OF CURVE BLADE IMPELLER IN GAS-LIQUID MIXING
  
ABSTRACT:
In this work the volumet ric mass transfer coefficient, kL a of a six bladed curve blade impeller (6CB) was compared with a standard six bladed Rushton Turbine   (6RT) by measuring dissolved oxygen content in 20 cm diameter cylindrical tank. It   was found that for gas rates in between 5 litre/min to 15 litre/min and rpm in between   300 to 700 rpm, 6CB gives 30 -50% higher volumetric mass transfer compared to   6RT at the same gas rate and impeller rotational speed. For the same range of gas   rates and impeller speed, volumetric mass transfer coefficient per unit power input   for 6CB was found to be higher than 6RT by 61% to 130% hence making 6CB as a   perfect candidate for retrofitting 6RT in order to obtain better mass transfer  performance for liquid-gas system without changing motor and shaft assembly.       

KEYWORDS: Stirred vessel, mass transfer, curve blade impeller, gas-liquid contacting.    
            
Author: Aziz A.R., Nik Sulaiman Nik Meriam. and Shaliza lbrahim
Year: 2004
implementasi_kaedah_prototaip_cepat_ke_atas_rekabentuk_kajian_kehilangan_selatm_di_dalam_rangkaian_atm.pdfIMPLEMENTASI KAEDAH PROTOTAIP CEPAT KE ATAS REKABENTUK KAJIAN KEHILANGAN SELATM DI DALAM RANGKAIAN ATM
  
ABSTRACT:
Information loss in ATM network occurs due to several factors. The ATM cell loss is one of them. In this study, the ATM cell characteristics were   manipulated and applied in developing a prototype design based on complex   programmable logic device (CPLD). The design starts from design modelling,   simulation, and it ends with design implementation using CPLD chips. With the help   of electronic design automation (EDA) tool and rapid prototyping technique, it can be concluded that the design prototype being developed was helpful in the said loss   study.       

KEYWORDS: Mod pindah tak segerak (asynchronous transfer mode or ATM),   prototaip cepat (rapid prototyping).

Author: Abu Bakar Hasan, Masuri Othman, Jamaludin Omar dan Mahamood lsmail
Year: 2004
electronic_grade_polysilicon_production_using_cvd_system_a_project_at_gao_kristall_plant_in_kyrgyzstan.pdfELECTRONIC GRADE POLYSILICON PRODUCTION USING CVD SYSTEM: A PROJECT AT GAO KRISTALL PLANT IN KYRGYZSTAN
  
ABSTRACT:
The GAO Kristan Polysilicon Project is a project implemented under the framework of bilateral cooperation between the Government of Malaysia and Kyrgyz Republic which aims at   producing electronic grade polysilicon samples at the GAO Kristan plant in Tash-Kumyr. The   production of polysilicon chains start off with sand or quartzite which is decomposed into metallurgical-grade silicon (MGS). The reaction of MGS with HCI will form SiHCl 3 which will then   go through several purification steps in order to obtain pure SiHCl 3. The subsequent reaction of SiHCl 3 and H2 in a chemical vapour deposition (CVD) reactor will deposit very pure polysilicon onto a thin monosilicon seed rod. The polysilicon samples were sent for testing at an independent lab in Norway and analysed using XRF spectroscopy to determine the main impurities of P, B, 0 and C. Several other impurities were also measured which include Fe, Cr, Ni, Cu, Zn, and Sb.   Based on the measurement of the impurity concentrations, the purity of the polysilicon was about   99.9995% which was below the requirement for an electronic-grade polysilicon which is 9.999999999%. Resistivity measurement showed a high concentration of P content which indicated that it was an n-type polysilicon.       

KEYWORDS: Chemical vapour deposition, electronic grade, GAO Kristan, metallurgical, polysilicon, solar-cell grade, silicon, trichlorosilane.       

Author: Uda Hashim, Abang Annuar Ehsan , Panarbek Botaliev and Jarrasul Abduraimov
Year: 2004
computer_modelling_of_intake_valve_angle_and_study_of_turbulence_kinetic_energy_and_dissipation_rate.pdfCOMPUTER MODELLING OF INTAKE VALVE ANGLE AND STUDY OF TURBULENCE KINETIC ENERGY AND DISSIPATION RATE
  
ABSTRACT:
Usually intake valve angle of all internal combustion engines is between 42° to 45°. The higher intake valve angle can reduce the valve edge thickness as well as the   life of intake valve. In this research the intake valve angle has been modelled to seven   different steps from 33° to 63° with 5° interval. The flow properties including turbulence   kinetic energy and dissipation-rate of turbulence kinetic energy in suction and exhaust   stroke inside a cylinder have been computed with seven different intake valve angles (33°,   38°, 43°, 48°, 53°, 58° and 63°) at each degree of crank angles from 180° to 360° in a   suction stroke and 0° to 180° in exhaust stroke of a four-stroke IC engine. The results of   the computational works show that turbulence kinetic energy in suction stroke starts   increasing from the suction valve full opening timing at 210° crank angle after the top dead   centre (TDC start at 180°) till the middle of the suction stroke at 260° crank angle in all the   seven intake valve angles and then found to decrease till the suction valve is completely   closed at 340° (20° before bottom dead centre BOC). The comparison of the effects of   intake valve angles on turbulence kinetic energy shows that increasing the intake valve   angles decreases the gradient and peak value turbulence kinetic energy. Dissipation-rate   of turbulence kinetic energy is also found to follow a similar pattern of variation like turbulence kinetic energy. 

KEYWORDS: Turbulence kinetic energy, computer modelling, intake valve angle, dissipation rate       

Author: M. M. Syed Ali, S. M. Sapuan , M. M. H. Megat Ahmad and W. Asrar
Year: 2004
aplikasi_komposit_polimer_dalam_industri_automobil.pdfAPLIKASI KOMPOSIT POLIMER DALAM INDUSTRI AUTOMOBIL
  
ABSTRACT:
In this paper, a literature review on the application of polymeric composite materials in automotive industry is presented. Advantages and disadvantages of polymeric composite materials are briefly discussed. The application of polymeric  composite materials in three main sections of automobile namely engine, power and transmission system, chasis and body installation and trim is presented by studying at various selected components such as pedal box, bumper, air intake manifold, suspension and spoiler. Design and manufacturing issues of polymeric composite   materials related to automobiles are also included.       

KEYWORDS: Komposit berasaskan polimer, komponen automotif, komposit  bertetulang gentian, casis, badan kereta, enjin dan penghantaran kereta.           

Author: S.M. Sapuan, A. Ariffin and M. F. Alias
Year: 2004
analisis_retak_elastik-plastik_dengan_kaedah_unsur_terhingga_kes_bebanan_mod_bergabung.pdfANALISIS RETAK ELASTIK-PLASTIK DENGAN KAEDAH UNSUR TERHINGGA KES BEBANAN MOD BERGABUNG
  
ABSTRACT:
This investigation involved simulation and experiment works to predict  a mixed mode crack growth direction and rates. In simulation stage, finite element   computer software named Q-CRACK has been developed and compared with otherssoftware such as MSC. NASTRAN, CASCA and FRANC2D/L. The investigation   used an aluminium plate with edge crack at the centre. Both ends of the plate were   subjected to a combination of mode I and II loading. The specimen was loaded at   loading angle 15°, 30° and 60°. Results from both simulation and experiment were   compared and showed similar agreement. The notch in a ductile material shows   blunting along a certain portion and sharpening, becomes very acute. However, some  of the results obtained from the finite element analysis package did not coincide with   experiment. Finally, several factors that can possibly influence this variation are noted   in conclusion.     

KEYWORDS: Crack, mixed mode, Finite Element Method (FEM), Linear Elastic  Fracture Mechanics (LEFM), J-integral, simulation.       

Author: Aidy Ali, Ahmad Kamal Arifin , Mohd. Sapuan Salit and Mohd. Yunin Hassan
Year: 2004