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Articles 271 - 300 of 590
Full-Text Articles in Biotechnology
Biofouling Community Structure In A Tropical Estuary Of Goa On The West Coast Of India, Desai Dattesh V, Krishnamurthy Venkat, Anil Arga Chandrashekar
Biofouling Community Structure In A Tropical Estuary Of Goa On The West Coast Of India, Desai Dattesh V, Krishnamurthy Venkat, Anil Arga Chandrashekar
ASEAN Journal on Science and Technology for Development
Biofouling community structure was studied in a tropical monsoon-influenced Mandovi estuary in Goa, west coast of India. Monthly, seasonal and yearly observations on biofouling on polyvinyl chloride (PVC) panels immersed at subsurface water level were recorded and photographed from May 2012 to September 2013. The barnacle Balanus amphitrite was the dominant fouling organism followed by calcareous polychaetes. The settlement and recruitment of barnacles took place year-round, with the exception of July 2012 and June 2013 (monsoon months). However, their peak abundance was observed during the later months of monsoon (August and September). Polychaetes were dominant during late post-monsoon and pre-monsoon …
Ballast Water Risk Assessment: The Indian Experience, Krishnamrthy Venkat, Sawant Subhash, Chandrashekar Anil Arga
Ballast Water Risk Assessment: The Indian Experience, Krishnamrthy Venkat, Sawant Subhash, Chandrashekar Anil Arga
ASEAN Journal on Science and Technology for Development
The Ballast Water Risk Assessment serves as a “Decision Support System” for any given port to take appropriate ballast water management actions. Risk assessment involves collation of data from the ballast water reporting forms to identify the source of ballast water. The environmental characteristics of the source and recipient ports are utilized to evaluate the similarities. This is then combined with other risk factors, including voyage duration and risk species to gain a preliminary indication of the overall risk posed by each source port. The results will help in evaluating the risk posed by ballast water introductions, and decide whether …
Application Of Fluorescence In Situ Hybridization-Flow Cytometry (Fish-Fcm) Technique To Detect And Quantify Vibrio Cholerae Population From Different Geographic Regions, Khandeparker Lidita, Desai Dattesh V., Anil Arga Chandrashekar, Sawant S. S., Venkat K., Mapari Kaushal, Jolkifli Zuliza, Abd. Karim, Thoha Hikmah, Hadiyanto Hadiyanto, Dalasane Soukaseum, Chounlamountry Kongngeun, Khaing Myint Myint, Dungca Jenelle Clarisse, Azanza Rhodora, Lim Chin Sing, Tan Koh Siang, Kajonwattanakul Sumana, Phuttapreecha Ratchanee, Le Hoang Mai
Application Of Fluorescence In Situ Hybridization-Flow Cytometry (Fish-Fcm) Technique To Detect And Quantify Vibrio Cholerae Population From Different Geographic Regions, Khandeparker Lidita, Desai Dattesh V., Anil Arga Chandrashekar, Sawant S. S., Venkat K., Mapari Kaushal, Jolkifli Zuliza, Abd. Karim, Thoha Hikmah, Hadiyanto Hadiyanto, Dalasane Soukaseum, Chounlamountry Kongngeun, Khaing Myint Myint, Dungca Jenelle Clarisse, Azanza Rhodora, Lim Chin Sing, Tan Koh Siang, Kajonwattanakul Sumana, Phuttapreecha Ratchanee, Le Hoang Mai
ASEAN Journal on Science and Technology for Development
Rapid and species-specific detection, and quantification of pathogenic bacteria are fundamental for monitoring and assessment of the risk they pose to any ecosystem. The study employed Vibrio cholerae, a human pathogen responsible for the life-threatening diarrhoeal disease, cholera and one among the most unwanted from marine bioinvasion point of view. The present study coupled fluorescence in situ hybridization (FISH) technique, a powerful tool in molecular phylogenetic discrimination, with flow cytometry (FCM), a technique used for rapid and accurate quantification of both viable but non-cultivable and non-viable microorganisms. The FISH-FCM technique was used for the first time to quantify V. cholerae …
Role Of Reporting In Compliance Monitoring And Enforcement Of Ballast Water Management, Mapari Kaushal E., Krishnamurty Venkat, Anil Arga Chandrashekar
Role Of Reporting In Compliance Monitoring And Enforcement Of Ballast Water Management, Mapari Kaushal E., Krishnamurty Venkat, Anil Arga Chandrashekar
ASEAN Journal on Science and Technology for Development
The Decision Support System (DSS) for ballast water management in any given port is dependent on the availability of information on ballast water carried by a ship in advance. Collation of information through Ballast Water Reporting Forms (BWRF) has been adopted by several countries. This paper provides a comparison of the reporting forms adopted by some of the countries and the International Maritime Organization (IMO) recommended BWRF. The manually submitted reporting forms have several limitations and India has developed a self-validating Electronic Ballast Water Reporting Form (e-BWRF) to overcome such issues. In addition, the possible direction for reporting in the …
Fouling Polychaetes In Tanjung Priok Port Of Jakarta, Indonesia, Hadiyanto Hadiyanto
Fouling Polychaetes In Tanjung Priok Port Of Jakarta, Indonesia, Hadiyanto Hadiyanto
ASEAN Journal on Science and Technology for Development
Fouling polychaetes in Tanjung Priok Port, Jakarta and their status were studied in order to update the list of marine alien species in Indonesia. Polychaetes were collected using six PVC panels that were submerged at a depth of 0.5 m over three months in Jakarta Bay. Polychaetes were identified to the lowest taxon possible based on characteristics of external morphology. The geographical distribution of identified polychaetes was then determined based on taxonomic literature in order to justify whether they were native or alien species for Indonesian waters. Twelve fouling polychaetes belonging to nine families are reported here. Of these, nine …
Challenges In Managing Marine Bio-Invasions Via Shipping In Singapore, Sing Lim Chin, Tan Koh Siang
Challenges In Managing Marine Bio-Invasions Via Shipping In Singapore, Sing Lim Chin, Tan Koh Siang
ASEAN Journal on Science and Technology for Development
The economic, social and environmental impacts arising from the transfer and establishment of non indigenous marine species (NIMS) mediated through ship hull biofouling and ballast water discharges in the coastal marine environment require a regional approach to manage bio-invasions. As the coordinating body for maritime shipping affairs and protection of the marine environment, the International Maritime Organization (IMO) has been working with member states to adopt and ratify global conventions aimed at preventing invasive species transfer through shipping. As a major shipping hub and port-of-call in Southeast Asia, Singapore faces multiple challenges in managing marine bio-invasions including managing the transit …
Numerical Modelling Of Ballast Water Dispersion In Different Bioregions Along The Coast Of India, Babu M.T., Sudheesh K, Vethamony P, Anuvindha S
Numerical Modelling Of Ballast Water Dispersion In Different Bioregions Along The Coast Of India, Babu M.T., Sudheesh K, Vethamony P, Anuvindha S
ASEAN Journal on Science and Technology for Development
Aquatic organisms and pathogens may become major threats to the coastal and marine environment when introduced into a region beyond their natural distributions through ballast water (BW). Coastal currents induced by tides and winds, especially ebb currents, may facilitate the spread of these marine organisms along nearshore and inshore areas. Numerical modelling of hydrodynamics is an effective tool to track the dispersion of these organisms in the receiving water body through BW release. Particle transport models can be used to track the advection and dispersion of these organisms. Alternatively, the difference in salinity of the BW and coastal waters can …
Recent Trends Of Demersal Marine Fish And Invertebrate Production In Southeast Asia – A Hypothesis-Based Analysis, Padate Vinay P., Rivonker Chandrashekher U.
Recent Trends Of Demersal Marine Fish And Invertebrate Production In Southeast Asia – A Hypothesis-Based Analysis, Padate Vinay P., Rivonker Chandrashekher U.
ASEAN Journal on Science and Technology for Development
Demersal marine fish and invertebrate production data for Southeast Asia (1996–2007) obtained from the Southeast Asian Fisheries Development Center (SEAFDEC) statistical bulletin indicated a reduced production by Thailand largely due to over-exploitation and altered coastal ecosystems. In contrast, increased production by Philippines, Indonesia and Malaysia was due to an increase in mechanised fishing fleets. Moreover, marginal increases in the ecosystem indicators were attributed to increased exploitation of high and mid trophic level organisms suggesting the development of “top-down” cascade effect in the future. In this bioregion, land use pattern affecting water quality coupled with altered monsoonal sequences and rising sea …
Survey Of Fouling Organisms At Songkhla Port In Thailand, Phuttapreecha Ratchanee, Kajonwattanakul Sumana, Songkai Phatcharin, Choamanee Chaovadee
Survey Of Fouling Organisms At Songkhla Port In Thailand, Phuttapreecha Ratchanee, Kajonwattanakul Sumana, Songkai Phatcharin, Choamanee Chaovadee
ASEAN Journal on Science and Technology for Development
The fouling organisms at Songkhla Port were investigated from November 2011 to December 2012. Samples were collected using PVC panels (10 cm x 20 cm) submerged for one-month and three-month periods. Analysis of fouling panels was carried out using PhotoGrid software. In addition to slime and silt, three types of fouling organisms, namely encrusting bryozoa, barnacles and calcareous polychaetes, were observed on the submerged PVC panels. Calcareous polychaetes and molluscs were the most diverse groups (ten species) on panels that were submerged for one-month and three-month periods. Barnacles (Balanus spp.) were most abundant on panels submerged for three-month periods, while …
Content, Daftar Isi
Content, Daftar Isi
ASEAN Journal on Science and Technology for Development
No abstract provided.
Adsorption And Diffusion Characteristics Of 2-Naphthol From Aqueous Media By Chitosan-Enr Biocomposites, Gunasunderi R., Mas Haris M. R. H.
Adsorption And Diffusion Characteristics Of 2-Naphthol From Aqueous Media By Chitosan-Enr Biocomposites, Gunasunderi R., Mas Haris M. R. H.
ASEAN Journal on Science and Technology for Development
Chitosan entrapped ENR-50 (CTS-t-ENR) biocomposites developed were studiedfor the absorption and desorption of 2-naphthol in aqueous media. Biocomposites comprising chitosan (CTS) immobilized or trapped in a partially crosslinked ENR (designated as CTS-t-ENR) was prepared by homogenising CTS in ENR-50 latex with curative agents in the presence of acetic acid. It was found that absorption increased with the increase in the initial 2-naphthol concentrations. Chitosan powder was found to be a poor absorbent compared CTS-t-ENR biocomposites. Desorption studyrevealed that the 2-naphthol diffusedslowly in water. The biocomposites exhibited a good slow-release properties and this was proven by the kinetic studyusing zero order, …
Quantitative Analysis Of Microcystin-Lr In Drinking Water Comparing On-Line Solid Phase Extraction And Direct Injection Lc/Ms/Ms, Malarvili R., Low Y.Y., Zaiton A.
Quantitative Analysis Of Microcystin-Lr In Drinking Water Comparing On-Line Solid Phase Extraction And Direct Injection Lc/Ms/Ms, Malarvili R., Low Y.Y., Zaiton A.
ASEAN Journal on Science and Technology for Development
An efficienmethod for microcystin-LRin drinking water at the sub-ng/l level applying on-line solid phase extraction (SPE) with LC/MS/MS detection and comparing it to direct injection LC/MS/MS is presented. The performance of the method of direct injection did not signifiantly deviate from the SPE approach. However, the direct injection method used less sample volume (100 µl) in shorter analysis time (4 min) and allowed more sample throughput. Conversely, the uncertainty of measurement could be reduced using SPE.
Influence Of Tespt On Tensile And Tear Strengths Of Vulcanized Silica-Filled Natural Rubbe, Norizah A.K., Azemi S.
Influence Of Tespt On Tensile And Tear Strengths Of Vulcanized Silica-Filled Natural Rubbe, Norizah A.K., Azemi S.
ASEAN Journal on Science and Technology for Development
The effectof coupling agent on tensile and tear strengthsof vulcanized NR filledwith 50 pphr of precipitated silica (VN3) was investgated. The amount of coupling agent was varied from 0,1,2,3,4,5 to 8 pphr. In the absence of coupling agent bis[3-(triethoxysilyl)propyl] tetrasulphide (TESPT), the tensile strengthof silica-fille vulcanized NR was lower than the tensile strengthof unfilledvulcanized NR. The enhancement in the tensile strengthwas achieved only when TESPT was incorporated into the rubber compound. The dependence of tensile strengthon the amount of TESPT showed a similar trend as the dependence of tensile strengthon the crosslink concentration. This might imply that varying the amount …
Preparation And Characterisation Of Crosslinked Natural Rubber (Smr Cv 60) And Epoxidised Natural Rubber (Enr-50) Blends, Sasitaran M., Manroshan S., Lim C.S., Veni B. N. Krishna, Ong S.K., Gunasunderi R.
Preparation And Characterisation Of Crosslinked Natural Rubber (Smr Cv 60) And Epoxidised Natural Rubber (Enr-50) Blends, Sasitaran M., Manroshan S., Lim C.S., Veni B. N. Krishna, Ong S.K., Gunasunderi R.
ASEAN Journal on Science and Technology for Development
In this sudy, the influenceof di(tert-butylperoxyisopropyl)benzene (DTBPIB) on the properties of natural rubber (NR) blend with epoxidized natural rubber (ENR) was determined. Fourier transform infrared spectroscopy with attenuated total refletance analysis and gel content confired crosslinking occurred in the rubber blends in the presence of peroxide DTBPIB percentage. Studies including tensile properties, dynamic mechanical properties, thermogravimetric analysis (TGA) and water absorptivity showed the changes in properties of the crosslinked NR/ENR blends. Tensile properties analysis disclosed the improvements in the modulus at 300% elongation and tensile stength with increasing NR ratios. Dynamic mechanical analysis revealed the blends to be incompatible and …
Assessment Of Natural Radioactivity Level And Radiological Index In The Vicinity Of Lynas Rare-Earth Processing Plants, Zal U’Yun W.M., Yii M.W., Ashhar K. Mohd, Khairuddin M.K., Kadir I. Abdul, Wahab Y. Mohd Abd
Assessment Of Natural Radioactivity Level And Radiological Index In The Vicinity Of Lynas Rare-Earth Processing Plants, Zal U’Yun W.M., Yii M.W., Ashhar K. Mohd, Khairuddin M.K., Kadir I. Abdul, Wahab Y. Mohd Abd
ASEAN Journal on Science and Technology for Development
The findingsof the sudy on assessment of natural radioactivity level and radiation hazard parameters in the vicinity of Lynas rare-earth processing plants are reported. This studyaims to quantify the environmental levels of natural radionuclides in soil collected in the vicinity of Lynas rare-earth processing plants and thereby to assess potential radiological hazards to the environment. About 31 terrestrialsampling locations were chosen for collection of the soil samples. The activity concentrations of the naturally occurring radioactive material (NORM) members, i.e. 226Ra, 228Ra, 238U, 232Th and 40K were measured using HpGe gamma spectrometer after reaching 30 days of secular equilibrium with their …
Thermal Efficient Design Of Distributed Memorgenerator For Dual-Port Ram Using Unidirectional High-Performance Io Standard, Das B., Abdullah M.F.L.
Thermal Efficient Design Of Distributed Memorgenerator For Dual-Port Ram Using Unidirectional High-Performance Io Standard, Das B., Abdullah M.F.L.
ASEAN Journal on Science and Technology for Development
he distributeddual-port RAM offersthe high-speed data rate transmission for differentmemory access modes such as: busy mode; interrupt mode; JTAG mode; maser mode; slave mode; and sleep mode, at high-frequency operation. The execution of these modes at high-frequency operation increases the on-chip temperature of distributeddual-port RAM. It might short the distribute dual-port RAM forever. Currently, differenttechniques have been reported, but significanton-chip temperature consumption is not reduced for distributeddual-port RAM. In this paper, the thermal-efficiendesign for disributed dual-port RAM was achieved using IO sandard technique. The distributeddual-port RAM was designed using differentIO standardssuch as; LVTTL IO standardand Mobile_DDR IO standard.It was determined …
Ediorial Board, Board Editorial
Ediorial Board, Board Editorial
ASEAN Journal on Science and Technology for Development
No abstract provided.
Effect Of Substrate Feeding Concentration On Initial Biofilm Development In Anaerobic Hybrid Reactor, Suraraksa B., Nopharatana A., Chaiprasert P., Bhumiratana S., Tanticharoen M.
Effect Of Substrate Feeding Concentration On Initial Biofilm Development In Anaerobic Hybrid Reactor, Suraraksa B., Nopharatana A., Chaiprasert P., Bhumiratana S., Tanticharoen M.
ASEAN Journal on Science and Technology for Development
To elucidate the effect of substrate concentration on biofilm development, glucose concentrations of 500 and 1,000 mg/L were used. At an early stage, biofilm development at both concentrations was not significantly different (P=0.621). After removing suspended biomass at 24 operational hours, the biofilm development at high substrate concentration was higher than at lower concentration. At 72 operational hours, the amounts of attached biomass at low and high glucose feeding were 9.04±1.17 and 28.58±2.72 g VSS/m2, respectively. The activities of acidogens, acetogens, and methanogens at the low glucose concentration were 0.334, 0.016 and 0.003 g COD/g VSS/h, and those at the …
Empirical Models For Power And Energy Requirements Ii : A Powered Implement Operation In Serdang Sandy Clay Loam, Malaysia, Kheiralla A. F., Yahya A., Zohadie M., Ishak W.
Empirical Models For Power And Energy Requirements Ii : A Powered Implement Operation In Serdang Sandy Clay Loam, Malaysia, Kheiralla A. F., Yahya A., Zohadie M., Ishak W.
ASEAN Journal on Science and Technology for Development
Power and energy requirements were measured with an instrumented tractor for rotary tilling in Serdang sandy clay loam soil. The effects of travel speed and rotor speed upon the measured data were investigated. Power model from orthogonal regression analysis was formulated based on linear and quadratic functions of travel speed and bite length. Fuel consumption model from regression analysis was formulated based on linear tractor PTO power as well as linear equivalent tractor PTO power. Fuel consumption rates predicted by ASAE D497.3 were found to be 25% to 28% overestimates of the values predicted by the model developed. However, fuel …
Application Of Deswirl Device In Cyclone Dust Separator, Abdullah M. Z., Husain Z., Fraser S. M.
Application Of Deswirl Device In Cyclone Dust Separator, Abdullah M. Z., Husain Z., Fraser S. M.
ASEAN Journal on Science and Technology for Development
The experimental investigations of the vortex flow inside the vortex finder (outlet duct) of the cyclone dust separator have been carried out. Preliminary study from the visualization experiment has been performed and discovered vortex instability inside the conventional vortex finder. In order to minimize the instabilities, the streamlined entry shape was inserted at the vortex finder entrance and the results showed remarkable improvement of the vortex flow instability inside the vortex finder. The velocity measurements of two main components of velocity were performed using a laser-Doppler anemometry at the cyclone vortex finder outlet. The experiments were conducted at a constant …
The Use Of Artificial Neural Network To Optimize The Ph Response Range Of Chlorophenol Red, Wong F., Ahmad M., Heng L. Y.
The Use Of Artificial Neural Network To Optimize The Ph Response Range Of Chlorophenol Red, Wong F., Ahmad M., Heng L. Y.
ASEAN Journal on Science and Technology for Development
Artificial Neural Network (ANN) had been used in this study to extend the response range of the pH indicator. The input from absorbance values of the absorbance spectra of chlorophenol red at different pH was used to train the ANN. During the training process, the coefficient values of the ANN will be adjusted to obtain the desire output. In this research, back propagation algorithm had been used for optimizing the response range of the pH indicator chlorophenol red in solution. The result indicates that the use of ANN enable the pH response range to be extended from 4.8-6.8 to 1.0-10.0.
Genetic Diversity Of Introduced (Pomacea Canaliculata) And Native (Pila) Apple Snails In Thailand Revealed By Randomly Amplified Polymorphic Dna (Rapd) Analysis, Thaewnon-Ngiw B., Klinbunga S., Phanwichien K., Sangduen N., Lauhachinda N., Menasveta P.
Genetic Diversity Of Introduced (Pomacea Canaliculata) And Native (Pila) Apple Snails In Thailand Revealed By Randomly Amplified Polymorphic Dna (Rapd) Analysis, Thaewnon-Ngiw B., Klinbunga S., Phanwichien K., Sangduen N., Lauhachinda N., Menasveta P.
ASEAN Journal on Science and Technology for Development
Genetic diversity of the introduced golden apple snail, Pomacea canaliculata (Lamarck, 1822) and four native apple snails; Pila ampullacea (Linneaus, 1758), P. angelica (Annandale, 1920), P. pesmei (Morelet, 1889) and P. polita (Deshayes, 1830) in Thailand were studied by RAPD analysis. Two hundred and two polymorphic fragments (180-1500 bp in length) were generated across overall investigated samples (N = 254) using three informative primers (OPA07, OPB10 and UBC122). The percentages of polymorphic bands were 98.86%, 94.56%, 90.91%, 96.94% and 95.51% for Pomacea canaliculata, P. ampullacea, P. angelica, P. pesmei and P. polita, respectively. This indicated high genetic polymorphism of these …
Efficient Reactive Power Compensation Algorithm For Distribution Network, Jerome J.
Efficient Reactive Power Compensation Algorithm For Distribution Network, Jerome J.
ASEAN Journal on Science and Technology for Development
The use of automation and energy efficient equipment with electronic control would greatly improve industrial production. These new devices are more sensitive to supply voltage deviation and the characteristics of the power system that was previously ignored are now very important. Hence the benefits of distribution automation have been widely acknowledged in recent years. This paper proposes an efficient load flow solution technique extended to find optimum location for reactive power compensation and network reconfiguration for planning and day-to-day operation of distribution networks. This is required as a part of the distribution automation system (DAS) for taking various control and …
Design Of A Hvdc-Based Controller For Load Change Compensation And Stabilization Of Inter-Area Oscillations, Ngamroo I.
Design Of A Hvdc-Based Controller For Load Change Compensation And Stabilization Of Inter-Area Oscillations, Ngamroo I.
ASEAN Journal on Science and Technology for Development
As an interconnected power system via a High-Voltage Direct Current (HVDC) link is subjected to a rapid load change with the frequency of inter-area oscillation mode, system frequency and tie line power may be severely disturbed and oscillate. To compensate for the rapid load change and stabilize both frequency and tie line power oscillations due to the inter-area mode, the dynamic power flow control via a HVDC link can be exploited. To implement this concept, a new design method of HVDC-based controller is proposed. To grasp a physical characteristic of the inter-area oscillation frequency, the technique of overlapping decompositions is …
Entropy Learning In Neural Network, Ng Geok See, Shi D., Wahab A., Singh H.
Entropy Learning In Neural Network, Ng Geok See, Shi D., Wahab A., Singh H.
ASEAN Journal on Science and Technology for Development
In this paper, entropy term is used in the learning phase of a neural network. As learning progresses, more hidden nodes get into saturation. The early creation of such hidden nodes may impair generalisation. Hence entropy approach is proposed to dampen the early creation of such nodes. The entropy learning also helps to increase the importance of relevant nodes while dampening the less important nodes. At the end of learning, the less important nodes can then be eliminated to reduce the memory requirements of the neural network.
Direct Synthesis Of Ladder Wave Digital Filters With Tunable Parameters, Samad S.A.
Direct Synthesis Of Ladder Wave Digital Filters With Tunable Parameters, Samad S.A.
ASEAN Journal on Science and Technology for Development
This paper proposes a method for the synthesis of ladder wave digital filters (WDFs) directly from the digital domain. This method avoids the need for the synthesis of analog reference filters conventionally required in WDF design. This direct method allows for the determination of the WDF coefficients from the digital domain transfer function. This is similar to conventional infinite impulse response (IIR) filter coefficient determination but the WDF will give a more efficient realization. Due to the WDFs power complementary properties, a first-order ladder WDF can simultaneously realize both lowpass and highpass responses using the same structure, while a second-order …
Chemical Desulphurisation Of Sub-Bituminous High Sulphur Indonesian Coal Via Peroxyacetic Acid Treatment, Ishak M.A.M., Ismail K., Nawi M.A.M., Ismail A.F.
Chemical Desulphurisation Of Sub-Bituminous High Sulphur Indonesian Coal Via Peroxyacetic Acid Treatment, Ishak M.A.M., Ismail K., Nawi M.A.M., Ismail A.F.
ASEAN Journal on Science and Technology for Development
The chemical desulphurisation from an Indonesian high sulphur sub-bituminous Banjarmasin Haji Ali-Aliansar coal was investigated using the peroxyacetic acid (PAA), a mild oxidising agent. A mixture of hydrogen peroxide:acetic acid (i.e. 30:70 by volume ratio with 6% of hydrogen peroxide concentration) at 50°C of reaction temperature is capable of reducing the total sulphur content in the coal from 3.46% to 1.29% by weight, corresponding to the removal of up to ca. 72% of the total sulphur; both the inorganic (mainly pyrite) and organic sulphur forms, and approximately 10 to 44% of ashes in the coal. The simultaneous removal of both …
Removal Of Sulfur Dioxide From Flue Gas Using Absorbent Prepared By Water And Steam Hydration, Teong Lee Keat, Mohamed Abdul Rahman, Bhatia Subhash
Removal Of Sulfur Dioxide From Flue Gas Using Absorbent Prepared By Water And Steam Hydration, Teong Lee Keat, Mohamed Abdul Rahman, Bhatia Subhash
ASEAN Journal on Science and Technology for Development
Active absorbent for flue gas desulfurization was prepared from coal fly ash, calcium oxide (CaO) and calcium sulfate (CaSO4 ) by hydro-thermal process; steam and water hydration. The absorbents were examined and compared for its micro-structural properties. The experiments were conducted based on Design of Experiments (DOE) according to 24 factorial design. The effect of various absorbent preparation variables such as hydration period (Factor A), ratio of CaO to fly ash (Factor B), amount of calcium sulfate used (Factor C) and drying temperature (Factor D) towards the BET surface area of the absorbent were studied. The BET surface area of …
Stability And Stabilization Of Nonlinear Dynamical Systems, Sattayatham P., Saelim R., Sujitjorn S.
Stability And Stabilization Of Nonlinear Dynamical Systems, Sattayatham P., Saelim R., Sujitjorn S.
ASEAN Journal on Science and Technology for Development
Exponential and asymptotic stability for a class of nonlinear dynamical systems with uncertainties is investigated. Based on the stability of the nominal system, a class of bounded continuous feedback controllers is constructed. By such a class of controllers, the results guarantee exponential and asymptotic stability of uncertain nonlinear dynamical system. A numerical example is also given to demonstrate the use of the main result.
Integrating Abc And Eva To Evaluate Investment Decisions, Chiadamrong N.
Integrating Abc And Eva To Evaluate Investment Decisions, Chiadamrong N.
ASEAN Journal on Science and Technology for Development
The significance of investment is transparent in the world of competitive business. Traditional costing systems in which their emphasizes are for short term savings rather than long term benefits have shown some lacking in providing accurate and reliable cost data for the investment decisions. Activity-based Costing (ABC), which is developed to satisfy some of the weaknesses of the traditional costing systems, can provide valuable insights into the operating processes and come up with more accurate cost data. In this paper, ABC is used to provide significant information for investment decisions. Although, the ABC method provides accurate operating product costs, it …