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Search Results: 1 - 10 of 2039 matches for " Tjoon Tow Teng "
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Semiconductor Wastewater Treatment Using Tapioca Starch as a Natural Coagulant  [PDF]
Mohd Omar Fatehah, Sohrab Hossain, Tjoon Tow Teng
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.511107
Abstract:

The efficiency of using tapioca starch as a natural coagulant on semiconductor wastewater treatment was investigated. The silica content in the wastewater was pH dependent and it was found that the reduction of COD and turbidity occurred at pH between 12 and 14 with measurements below 100 mg/L and 100 NTU respectively. A three-level factorial design experiment in the Response Surface Methodology (RSM) was applied to determine the influence of retention time and dosage of the tapioca starch. The parameters studied were chemical oxygen demand (COD), turbidity and total suspended solids (TSS). The R2 for turbidity, COD and TSS were 0.92, 0.92 and 0.77 respectively. Results indicate that the dosage of the tapioca starch has a higher influence on COD and turbidity reduction. Tapioca starch as a natural coagulant has shown that the optimum turbidity reduction was 99% at a settling time of 30 minutes with dosage of 0.1 g/L. The COD reduction was achieved at 87% after 60 min of retention time and 0.1 g/L of dosage while higher coagulant dosages reduced the TSS concentration to 10.9 mg/L at retention time between 50 to 60 minutes.

Studies on Flocculating Activity of Bioflocculant from Closed Drainage System (CDS) and Its Application in Reactive Dye Removal
Yasaman Sanayei,Norli Ismail,Tjoon Tow Teng,Norhashimah Morad
International Journal of Chemistry , 2010, DOI: 10.5539/ijc.v2n1p168
Abstract: Technological production processes of organic dyes soluble in water, as well as the processes for their application in textile industries, may heavily pollute natural waters, particularly from the point of view of their pronounced colored wastewaters. Reactive dyes are prominent among numerous groups of water-soluble dyes. The bioflocculant was effective in flocculating a kind of reactive soluble dyes (Cibacron yellow FN_2R) in aqueous solution. A bioflocculant– producing bacterium were isolated from wastewater and sediments of Close Drainage Systems (CDS) located at the Prai industrial area.. Compared with conventional chemical flocculants, bioflocculants are biodegradable and nontoxic, and produce no secondary pollution. Sphingomonas paucimobilis was found to produce a bioflocculant with high flocculating activity for Kaolin suspension and water-soluble dyes. The best temperature flocculation performance was 35°C and shaking speed of 160 rpm. The highest flocculating efficiency achieved for Kaolin suspension was 98.4% at 35°C after 48 hours cultivation. Various culture temperatures were tested between 2 hours in order to investigate their effect on the bioflocculant production when the culture temperature was 35°C which the flocculating activity of Sphingomonas paucimobilis was up to 98.4%. It was found that, flocculating rate depends on time and temperatures. Determination flocculating activity was shown Sphingomonas paucimobilis is biodegradable and increase in number of bacteria during the time will confirm that. This study was conducted to biologically treat wastewater discharged from the textile industry using sequencing batch reactor (SBR) technology biological flocculation on COD removal and effects of solids detention times and MLVSS on EPS production.
Preparation, Characterization and Application of Mg(OH)2-PAM Inorganic-Organic Composite Polymer in Removing Reactive Dye
Khai Ern Lee,Norhashimah Morad,Tjoon Tow Teng,Beng Teik Poh
Iranica Journal of Energy and Environment (IJEE) , 2012,
Abstract: In this study, a series of inorganic-organic composite polymer was prepared. Magnesium hydroxide and polyacrylamide was composed in a composite matrix to prepare Mg(OH)2-PAM (MHPAM) inorganic-organic composite polymer. The characteristics of MHPAM inorganic-organic composite polymer was investigated in terms of chemical, physical, physical, thermal and morphological properties through FT-IR, conductivity, intrinsic viscosity, TGA and TEM, respectively. Results showed that the properties of MHPAM composite polymers varied with the compositions in the composite polymers. Different compositions of MHPAM inorganic-organic composite polymers were applied in removing reactive dye from aqueous solution. MHPAM inorganic-organic composite polymer with Mg(OH)2 : PAM ratio of 90 : 10 gave the best dye removal (%) where it was able to remove 98% of reactive dye at pH 11.00 with a dosage of 500 mg/L. Kinetics study was carried out using different dye concentration and it was found that the experimental data fitted the pseudo-second-order model better compared to pseudo-first-order model.
Long-Term Prediction of Biological Wastewater Treatment Process Behavior via Wiener-Laguerre Network Model
Yasaman Sanayei,Naz Chaibakhsh,Ali Chaibakhsh,Ali Reza Pendashteh,Norli Ismail,Tjoon Tow Teng
International Journal of Chemical Engineering , 2014, DOI: 10.1155/2014/248450
Abstract: A Wiener-Laguerre model with artificial neural network (ANN) as its nonlinear static part was employed to describe the dynamic behavior of a sequencing batch reactor (SBR) used for the treatment of dye-containing wastewater. The model was developed based on the experimental data obtained from the treatment of an effluent containing a reactive textile azo dye, Cibacron yellow FN-2R, by Sphingomonas paucimobilis bacterium. The influent COD, MLVSS, and reaction time were selected as the process inputs and the effluent COD and BOD as the process outputs. The best possible result for the discrete pole parameter was . In order to adjust the parameters of ANN, the Levenberg-Marquardt (LM) algorithm was employed. The results predicted by the model were compared to the experimental data and showed a high correlation with and a low mean absolute error (MAE). The results from this study reveal that the developed model is accurate and efficacious in predicting COD and BOD parameters of the dye-containing wastewater treated by SBR. The proposed modeling approach can be applied to other industrial wastewater treatment systems to predict effluent characteristics. 1. Introduction The reactive dye-containing effluents from dye manufacturing and application industries can cause serious environment pollution due to the toxicity and slow degradation of dyes [1]. In addition, the presence of dyes in water is highly visible and affects water transparency and aesthetics even in low concentrations. Therefore, the effluents must be treated before being released into the environment. In recent years, researchers have shown interests in biological treatment of wastewaters with high concentrations of dyes [2, 3]. Treatment of these polluted wastewaters requires high effectiveness and low cost dye removal processes [4]. Sequencing batch reactor (SBR) is a promising biological system for treating dye-containing wastewaters [5, 6]. This system is cost efficient and flexible to handle different feed characteristics. Furthermore, its operation is easier than other biological methods [1]. However, the SBR process, like other biological processes, is highly nonlinear, time varying, and subject to significant disturbances [7]. Modeling the treatment process can provide better understanding, design, operation, and control of the process [8]. The ability of artificial neural networks (ANNs) in black-box modeling of nonlinear systems with complicated structure has made them the most popular tool for modeling of biological processes [9]. In recent years, recurrent neural networks are
How residents and interns utilise and perceive the personal digital assistant and UpToDate
Jason Phua, Tow Lim
BMC Medical Education , 2008, DOI: 10.1186/1472-6920-8-39
Abstract: This is a questionnaire survey of all residents and interns in a tertiary teaching hospital.Out of 168 doctors, 134 (79.8%) responded to the questionnaire. Only 54 doctors (40.3%) owned a PDA. Although these owners perceived that the PDA was most useful for providing drug information, followed by medical references, scheduling and medical calculators, the majority of them did not actually have medical software applications downloaded on their PDAs. The greatest concerns highlighted for the PDA were the fear of loss and breakage, and the preference for working with desktop computers and paper. Meanwhile, only 76 doctors (56.7%) used UpToDate, even though the hospital had an institutional subscription for it. Although 93.4% of these users would recommend UpToDate to a colleague, only 57.9% stated that the use of UpToDate had led to a change in their management of patients.Although UpToDate and various PDA software applications were deemed useful by some of the residents and interns in our study, both digital tools were under-utilised. More should be done to facilitate the use of medical software applications on PDAs, to promote awareness of tools for evidence-based medicine such as UpToDate, and to facilitate the application of evidence-based medicine in daily clinical practice.Evidence-based medicine involves the use of available evidence from the medical literature to optimise patient care. In recent years, physicians in training have increasingly relied on electronic resources to retrieve the necessary medical evidence to aid in their daily clinical practice [1-8]. Specifically, two digital tools – which are conceptually very different – have become especially popular. The first tool, the personal digital assistant (PDA), is a handheld computer onto which medical software applications may be downloaded, which by virtue of its unique portability can be relied upon at anytime to provide the necessary medical information at the bedside. In addition, it contains multip
Acute visual loss in a patient with optic disc drusen
Tan DK,Tow SL
Clinical Ophthalmology , 2013,
Abstract: Deborah KL Tan,1,2 Sharon LC Tow1–3 1Singapore National Eye Centre, 2Singapore Eye Research Institute, 3National University Health System, Singapore Abstract: Here we report a case of sudden, unilateral, painless visual loss in a middle-aged patient. A 45-year-old gentleman with no known past medical history presented with acute painless left visual impairment. Clinically, he was found to have a left optic neuropathy associated with a swollen and hyperemic left optic disc. The right optic disc was noted to be small and crowded, and both optic discs were noted to have irregular margins. Humphrey perimetry revealed a constricted visual field in the left eye. Fundus autofluorescence imaging revealed autofluorescence, and B-scan ultrasonography showed hyperreflectivity within both nerve heads. Blood investigations for underlying ischemic and inflammatory markers revealed evidence of hyperlipidemia but were otherwise normal. A diagnosis of left nonarteritic anterior ischemic optic neuropathy (NAAION) was made, with associated optic disc drusen and hyperlipidemia. NAAION typically occurs in eyes with small, structurally crowded optic discs. The coexistence of optic disc drusen and vascular risk factors may further augment the risk of developing NAAION. Keywords: optic disc drusen, ischemic optic neuropathy, painless visual loss
Pro/con debate: In patients who are potential candidates for organ donation after cardiac death, starting medications and/or interventions for the sole purpose of making the organs more viable is an acceptable practice
Jason Phua, Tow Lim, David A Zygun, Christopher J Doig
Critical Care , 2007, DOI: 10.1186/cc5711
Abstract: You are an intensivist in an institution that performs solid organ transplantations. In an effort to provide patients and families with increased opportunities to donate their organs, the institution has recently developed a policy for donation after cardiac death (DCD). With the new DCD policy, organ donation is offered to patients and their families in a controlled setting when death occurs immediately following the withdrawal of life-support. Based on your understanding of organ donation, you are aware there are certain medications (for example, inotropes to maintain tissue perfusion) and certain management practices that may allow the donated organs to have better outcome. You wonder about the ethics of starting interventions that will have no benefit to the dying patient but will benefit the organs that are about to be donated.Jason Phua and Tow Keang LimWhat medications and interventions are started in potential donors before death for the sole purpose of making the organs more viable in DCD, and how do they affect organ function?Firstly, inotropes and vasopressors are crucial for the preservation of organ perfusion in patients in shock. The majority of potential donors are hypotensive before cardiac death [1], and hypotension worsens graft function [2]. Secondly, anticoagulants such as heparin decrease the risk of thrombosis after the circulatory arrest and the negative consequences on organ function. To maximize effectiveness, heparin should ideally be administered before death into an intact circulation for systemic distribution [3]. Experimental data show preserved organ function with antemortem but not postmortem heparin administration [4,5]. Thirdly, vasodilators such as phentolamine may enhance organ blood flow and lower the incidence of delayed renal graft function [6]. More controversial practices are the administration of thrombolytics and antemortem cannulation in preparation for the administration of cold preservation solution.Although rarely perfo
A Application of Cloud Computing and IOT in Logistics  [PDF]
Dongxin Lu, Qi Teng
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B039
Abstract: This paper analyzes the characteristics of cloud computing and IOT (internet of things), introduce a logistics operation based on cloud computing and IOT, which establish a logistics information interchange, data exchange to meet the business requirements of the various types of logistics public information platform.
Emerging Asia’s Version of the Mundell-Fleming Model  [PDF]
Suresh Ramanathan, Kian Teng
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.49064
Abstract:

This paper explains the Mundell-Fleming model in the context of Emerging Asia economies management of capital mobility. Central Banks and Financial Regulators in Emerging Asia adopt a modified version of the model that incorporates two vital levers, a policy driven and a market driven method that is adaptable to the magnitude of capital flow. A policy combination mix of both policy and market driven provides smooth monetary policy signal transmission to exchange rates.

The Role of Neuroticism in the Relation between Self-Esteem and Aggressive Emotion among 1085 Chinese Adolescents  [PDF]
Zhaojun Teng, Yanling Liu
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.410103
Abstract:

The present study aimed to reveal the role of neuroticism on the relationship between self-esteem and aggressive emotion. We conducted a cross-sectional study in which a battery of self-report questionnaires was used to assess self-esteem, neuroticism and aggressive emotion in 1085 Chinese adolescents (N = 1085, Mage = 16.38 years, 753 boys). We found that self-esteem could make a negative prediction of aggressive emotion both in males and females. And also, we found the mediating role of neuroticism was in both males and females, on the relations between self-esteem and aggressive emotion, especially, the moderating role of neuroticism among males in the aspect of relationship between self-esteem and aggressive emotion. In conclusion, neuroticism was of importance for aggressive emotion, which was conducive to interventions. According to these findings, at the same time, implications and limitations were discussed in the content.

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