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JAYAPRAKASH SATHTHASIVAM,GARY TANG,KIM CHOON NG 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.1
The application of Fault Detection and Diagnosis (FDD) could play a key role in operating chillers at optimum e±ciency. As air-conditioning consumes a significant proportion (approximately 30% to 50%) of the total power consumption of a commercial building, an e®ective FDD tool is very much required for a reliable and economic chiller operation. In this paper, the renowned Simple Thermodynamic Model, STM (also known as Gordon and Ng Universal Chiller Model) was utilized to detect and diagnose some of the common faults in centrifugal chillers. Based on the readily available, nonintrusive, steady state measurements extracted from the on-site chillers, the STM model was regressed to obtain two physically meaningful coe±cients, namely, Thermal Resistance and Internal Entropy Generation. These information-rich coe±- cients were then analyzed to evaluate the performances and the conditions of the chillers. Despite the large and yet complex on-site chiller operations, equipped with built-in heat recovery, such as economizer and intricate control mechanisms, the predictive and diagnostic capabilities of STM in detecting chiller faults has been successfully tested and evaluated based on the data collected from on-site centrifugal chillers. Faults like condenser fouling and reduction in condenser cooling water flow rate were succinctly captured by the STM model.
Silicon/Pad Pressure Measurements During Chemical Mechanical Polishing
STEVEN DANYLUK,GARY NG,INHO YOON,FRED HIGGS,CHUNHONG ZHOU 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Chemical mechanical polishing refers to a process by which silicon and partially-processed integrated circuits (IC's) built on silicon substrates are polished to produce planar surfaces for the continued manufacturing of IC's. Chemical mechanical polishing is done by pressing the silicon wafer, face down, onto a rotating platen that is covered by a rough polyurethane pad. During rotation, the pad is flooded with a slurry that contains nanoscale particles. The pad deforms and the roughness of the surface entrains the slurry into the interface. The asperities contact the wafer and the surface is polished in a three-body abrasion process. The contact of the wafer with the "soft" pad produces a unique elastohydrodynamic situation in which a suction force is imposed at the interface. This added force is non-uniform and can be on the order of the applied pressure on the wafer. We have measured the magnitude and spatial distribution of this suction force. This force will be described within the context of a model of the sliding of hard surfaces on soft substrates.
Jason Wei Jian Ng,Gary John Rangel,Santha Vaithilingam,Subramaniam S. Pillay 동아시아연구원 2015 Journal of East Asian Studies Vol.15 No.2
In this article we respond to Thomas Pepinsky’s commentary on our article “2013 Malaysian Elections: Ethnic Politics or Urban Wave?” (both in this issue). We confirm that both ethnicity and urbanization play important roles in determining the incumbent ruling party’s percentage vote share in the thirteenth general election. In doing so, we address the various econometric issues raised by Pepinsky and clearly explain the advantages of our econometric methodology vis-à-vis the OLS analysis espoused by Pepinsky. Our main results indicate that Barisan National’s (BN) vote share from Bumiputera voters, regardless of urbanization levels of the parliamentary constituency, is below the 50 percent threshold. This result is surprisingly compensated by the more than 50 percent support for BN when Chinese voters are a small minority of the electorate. We also argue that Pepinsky’s statement that Malay voters are predominantly rural voters is inaccurate and provide evidence to the contrary.
The 2013 Malaysian Elections:Ethnic Politics or Urban Wave?
Jason Wei Jian Ng,Gary John Rangel,Santha Vaithilingam,Subramaniam S. Pillay 동아시아연구원 2015 Journal of East Asian Studies Vol.15 No.2
In this article we examine the electoral impact of urbanization vis-à-vis ethnicity in Malaysia. We employ a robust econometric technique, the fractional response logit model, on data from the recently concluded thirteenth general election. The findings show that there are both an ethnic effect and an urban effect in determining the distribution of parliamentary seats among the political groups. Strong support for the opposition coalition, Pakatan Rakyat, was evident in urban constituencies, while the ruling coalition, Barisan Nasional, continued to enjoy success in rural constituencies. Although Barisan Nasional is still dependent on Bumiputera support, its success is also dependent on non-Bumiputera support from rural constituencies. However, with declining birthrates among the Chinese electorates, this support may not be forthcoming in future elections. We also provide insights for both coalitions to consider in developing strategies for the next election. KEYWORDS: Malaysia, thirteenth general election, ethnic politics, fractional logit response model, urbanization.
Mohammed Al-Bloushi,Jayaprakash Saththasivam,Sari Al-Sayeghc,정상현,Kim Choon Ng,Gary L. Amy,TorOve Leiknes 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Biofouling can significantly hamper the efficiency of seawater cooling towers. The aim of this study was to investigate the effectiveness of alternative oxidants (i.e. ozone (O3) and chlorine dioxide (ClO2)) comparing with commonly being used chlorine in biofouling control. Effects of cycle of concentration, temperature and oxidant dosage along with residual decay and kinetics were studied. Even at lower oxidant dosage (total residual oxidant equivalent = 0.1 mg/l Cl2), ClO2 showed a better disinfection effect compared to chlorine and O3. Results of bench-scale studies will be helpful in the selection of appropriate oxidant for seawater cooling tower operation.
Al-Bloushi Mohammed,Saththasivam Jayaprakash,Jeong Sanghyun,Al-Refaie Abdullah,Raju S. Arun Kumar1,Choon NG Kim,Amy L. Gary,Leiknes TorOve 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Biofouling in the open recirculating cooling water systems may cause biological corrosion, which can reduce the performance, increase the energy consumption and lower heat exchange resulting in reduced efficiency of the cooling tower (CT). Seawater CTs are prone to bio-fouled due to the presences of organic and inorganic compounds which act as nourishment for various microorganisms like (algae, fungi, and bacteria) for their growth under certain environmental conditions. The most commonly being used method to control the biofouling in CT is by addition of biocides such as chlorination. In this study, diatom and green algae were added to the CT basin and its viability was monitored in the recirculating cooling seawater loop as well as in the CT basin. Three different types of oxidizing biocides, namely chlorine, chlorine dioxide (Chlorine dioxide) and ozone, were tested by continuous addition in pilot-scale seawater CTs and it was operated continuously for 60 d. The results showed that all biocides were effective in keeping the biological growth to the minimum regardless of algal addition. Amongst the biocides, ozone could reduce 99% of total live cells of bacteria and algae, followed by Chlorine dioxide at 97%, while the conventional chlorine showed only 89% reduction in the bioactivities.
Al-Bloushi Mohammed,Saththasivam Jayaprakash,Jeong Sanghyun,Al-Refaie Abdullah,Raju S. Arun Kumar,Kim Choon NG,Amy L. Gary,Leiknes TorOve 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Biofouling in the open recirculating cooling water systems may cause biological corrosion, which can reduce the performance, increase the energy consumption and lower heat exchange resulting in reduced efficiency of the cooling tower (CT). Seawater CTs are prone to bio-fouled due to the presences of organic and inorganic compounds which act as nourishment for various microorganisms like (algae, fungi, and bacteria) for their growth under certain environmental conditions. The most commonly being used method to control the biofouling in CT is by addition of biocides such as chlorination. In this study, diatom and green algae were added to the CT basin and its viability was monitored in the recirculating cooling seawater loop as well as in the CT basin. Three different types of oxidizing biocides, namely chlorine, chlorine dioxide (Chlorine dioxide) and ozone, were tested by continuous addition in pilot-scale seawater CTs and it was operated continuously for 60 d. The results showed that all biocides were effective in keeping the biological growth to the minimum regardless of algal addition. Amongst the biocides, ozone could reduce 99% of total live cells of bacteria and algae, followed by Chlorine dioxide at 97%, while the conventional chlorine showed only 89% reduction in the bioactivities.