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Azmirruddin M.,Advanced Materials Research Center | Johari N.,Advanced Materials Research Center | Jabir M.,Advanced Materials Research Center | Ibrahim R.,Advanced Materials Research Center | Talib A.R.A.,3400 UPM Serdang
Advanced Materials Research | Year: 2014

In PIM process, the molding stage is a critical step for the fabrication of sound parts without cracks and distortions. So, this step requires specific rheological behavior. Rheological analysis can be made to quantify the stability of the PIM feedstock during molding process. In this study, an experimental rheological study has been performed to evaluate the influence of palm stearin on the rheological behavior and stability of Inconel 718 powder injection molding (PIM) feedstock. The effects of shear rate and temperature were investigated via capillary rheometer method. The viscosity and shear rate of the feedstock were measured at various range of temperature and shear rate across the L/D = 1 capillary rheometer. The results show that the formulation binder system PSPE 7030 is the best feedstock to be injection molded because it has moderate value of flow sensitivity index, lower value for flow activation energy and higher value for mold ability index. Besides that, the increasing of PS content in the binder system has found reduce viscosity and value of flow activation energy and increase value of mold ability index of feedstock. © (2014) Trans Tech Publications, Switzerland. Source

Nair G.,University Malaysia Perlis | Shafawi M.,University Malaysia Perlis | Irwanto M.,University Malaysia Perlis | Yusoff M.I.,University Malaysia Perlis | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

This project is to investigate the counter electrode material from two different carbon sources to fabricate dye sensitized solar cell (DSSC). The carbon sources are extracted from battery and pencil lead. The method to prepare the DSSC is through the conventional Dr.Blading method. The same method is also used for the counter electrode which uses carbon from recycle batteries, the carbon from pencil lead are scribbled onto the ITO glass to get a uniform coating. Both thickness of the counter electrode vary accordingly. The solar cells are then placed under outdoor solar irradiation and the output is taken every 10 minutes. Based on observation, the solar cells which have the carbon from batteries shows higher cell efficiency which is 8.2% with lower FF of 0.78, compared to by using the pencil lead, the cell efficiency is only 7.23% but with a higher FF of 0.93. © (2014) Trans Tech Publications, Switzerland. Source

Chin C.Y.,University of Malaya | Chin C.Y.,Curtin University Australia | Mooi C.S.,3400 UPM Serdang
Life Science Journal | Year: 2012

Little is known about the accuracy of serum creatinine (SCr) in identifying early chronic kidney disease (CKD) in the primary care setting. Thus, this study aims to examine the concordance of SCr to estimated glomerular filtration rate (eGFR) in detecting early CKD. This is part of a randomly selected 10-year retrospective, observation cohort study of patients registered with the Department of Primary Care Medicine Clinic at the University of Malaya Medical Centre. A SCr ≥ 132μmol/L and eGFR < 60 ml/min are used as the cut-off points for impaired renal function. Kappa statistic is used to test the inter-rater agreement of SCr with eGFR. A total of 1100 subjects were recruited. The mean age, SCr and eGFR were 66±9 years, 86±42 μmol/L and 70±30 ml/min respectively. The concordance between SCr and eGFR was poor as 363 (35.5%) patients had normal SCr but abnormal eGFR. Kappa value was 0.022 (p<0.001). Screening for CKD using SCr fails to detect an additional third of patients with impaired renal functions. Hence using eGFR is a better way to identify early CKD. Source

Mohamad A.,3400 UPM Serdang | Azlan A.,3400 UPM Serdang | Azlan A.,University Putra Malaysia | Razman M.R.,National University of Malaysia | And 2 more authors.
Journal of Food, Agriculture and Environment | Year: 2013

Fish is a good source of high-quality protein, vitamins and other essential nutrients, especially essential fatty acids (EFAs), known as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Nutritionists have suggested an intake of 35g or more of fish daily and two fatty fish-meals per week as to reduce the relative risk of death from coronary heart diseases. However, fish consumption also has been identified as one of the primary route of exposure to polychlorinated biphenyls (PCBs). This study has identified the type and level of 12 congeners of PCBs that are the most toxic to humans. The maximum permitted level of PCBs is 4 pg/g for muscles meat of fish and fishery products by World Health Organization (WHO) using 2005 WHO-TEFs. The highest amount of PCBs concentration was in Anadara granosa (cockles) with level of 2.61pg/g wet weight. Other species such as Psettodes erumei (large-scale tongue sole), Plotosus spp. (gray eel-catfish), Sepia officinalis (cuttle fish), and Macrobrachium rosenbergi (prawn) contained relatively low concentration of PCBs in their tissue collected from West Coast of Peninsular Malaysia. Therefore, it can be concluded that these demersal fish and shellfish are safe to consume. Source

Agung E.H.,3400 UPM Serdang | Agung E.H.,Malahayati University | Sapuan S.M.,3400 UPM Serdang | Hamdan M.M.,National Defence University of Malaysia | And 2 more authors.
Advanced Materials Research | Year: 2011

Differential scanning calorimetry (DSC) was used to study the thermal behaviour of abaca fibre reinforced high impact polystyrene (HIPS) composites. Thermal analysis is based upon the detection of changes in the heat content (enthalpy) and the glass transition temperature (Tg) of optimum condition of abaca fibre reinforced HIPS composites. in this research, glass transitions temperature (Tg) of neat HIPS occurred below the Tg of optimum condition of composites as the temperature of an amorphous state. The endothermic peak of composites was in to range 430-435°C including neat HIPS and it observed that enthalpy of abaca fibre reinforced HIPS composites yielded below the neat HIPS 748.79 J/g. © (2011) Trans Tech Publications. Source

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