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<![CDATA[Aphorpines and benzylisoquinoline alkaloids from bark of Cryptocarya crassinervia ]]>
<![CDATA[Nurdin Saidi]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Two aphorpine alkaloids, (+)-lirinine 1 and (+)-lirioferine 2 and two bezylisoquinoline alkaloids (+)-reticuline 3 and (-)-N-Methylisococlaurine 4 were isolated from bark of Cryptocarya crassinervia. The structures were elucidated by spectral analysis, including 1D-NMR (1H, 13C, DEPT), 2D-NMR (COSY, HMQC, HMBC), UV, IR, and MS and comparison with the published data.]]>
<![CDATA[Applying genetic algorithm on power system stabilizer for stabilization of power system ]]>
<![CDATA[Arnawan Hasibuan]]>;
<![CDATA[. Syafrudin]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[This paper the genetic algorithm method is used in Power System Stabilizer (PSS) for power system stability is discussed. Parameters of PSS on generator system in a state determined offline using genetic algorithms and the objective function is based on eigen value system was described in detail. PSS parameters and the location is calculated to maximize damping performance in different operating conditions. Genetic algorithm is a kind of random search algorithm based on the mechanism of natural selection and natural genetics. Genetic algorithms are used as search parameters of the PSS technique, which utilizes genetic operators to find the nearest optimal solution. An advantage of the search with the GA is not trapped in an early convergence ]]>
<![CDATA[Analysis of turbulence models performance for the predictions of flow yield, efficiency, and pressure drop of a gas-solid cyclone separator ]]>
<![CDATA[Novi Sylvia]]>;
<![CDATA[. Yunardi]]>;
<![CDATA[Ilham Maulana]]>;
<![CDATA[. Elwina]]>;
<![CDATA[. Wusnah]]>;
<![CDATA[Yazid Bindar]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[This paper presents the results obtained from the application of computational fluid dynamics (CFD) to modelling the flow field of a Lapple cyclone and to optimizing the cyclone based upon its geometrical parameters. A pre-processor software GAMBIT was employed to set up the configuration, discretisation, and boundary conditions of the cyclone. The characteristics of the cyclone being studied was 0.2 m in diameter, receiving a gas flow rate of 0.1 m3/s with a particle mass loading of 0.01 kg/m3. A commercial CFD code FLUENT 6.2.16 was employed to simulate the flow field and particle dynamics in the cyclone. The objective of this research was to investigate the performance of a number of turbulence models on the prediction of the flow field, collection efficiency and pressure drop in the Lapple cyclone. A number of five turbulence models under Reynolds Averaged Navier Stokes (RANS) category, including Spallart-Allmaras, standard k-ε model, RNG k-ε model, standard k-ω model, and Reynolds Stress Model (RSM) were examined in the simulation of the flow field and particle dynamics inside the cyclone. A validation of all calculation was performed by comparing the predicted results in terms of axial and tangential velocities, efficiency and pressure drop against experimental data of a Lapple cyclone taken from literature. The results of the investigation show that out of five turbulence models being tested, the RSM presented the best predicted results. The predictions of axial and tangential velocities as well as cyclone efficiency by this model are in excellent agreement with the experimental data. Although the pressure drop in the cyclone is under-predicted, the RSM predictions are far better than those of other model. Other turbulence models are over-predicted and under-predicted the axial and tangential velocity, respectively. With respect to efficiency and pressure drop of the cyclone, other models are capable of following the trend of the experimental data but they failed to agree with the experimental values. These results suggest that the RSM is the most suitable turbulence model to represent the flow field and particle dynamics inside a cyclone gas-solid separator.]]>
<![CDATA[Acetosolv pulping modeling of oil palm frond fibers ]]>
<![CDATA[Nasrullah RCL]]>;
<![CDATA[I. Mazlan]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Oil palm frond fibers were pulped using acetosolv pulping in laboratory scale batch digester. A central composite desigh was used to investigate the process and to study the effect of its variables on pulp quality and yield. A second order polynomial regression model, using three in dependent process variables, was found to be appropriate for describing acetosolv pulping oil palm fibers. The overall pulping conditions, which maximize yield while subject to a restriction of kappa number 19.93 were estimated at pulping time of 130 mins, a pulping temperature of 153 oC, AcOH of 85 % and HCl of 0.25 %]]>
<![CDATA[Simulation of sea surface temperature (SST) and sea surface salinity (SSS) in the Bay of Bengal ]]>
<![CDATA[Syamsul Rizal]]>;
<![CDATA[. Muhammad]]>;
<![CDATA[Taufiq Iskandar]]>;
<![CDATA[Ichsan Setiawan]]>;
<![CDATA[Agus Satriadi,]]>;
<![CDATA[. Radinal]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[The simulation of Bay of Bengal (included Andaman Sea) has been done. This investigation used equation of motion (Navier-Stokes equation). The equation of motion was solved by means of Hamburg Shelf Ocean Model (HAMSOM). The analysis is done for the year of 2007. The National Centers for Environmental Prediction (NCEP) data for year of 2007 is used to force the Bay of Bengal. The sea surface temperature (SST) and sea surface salinity (SSS) have been obtained and analyzed. The highest SST occurs in April 2007, while the lowest SST occurs in October 2007. The pattern of SST depends on the wind vector. From January untill June 2007, the SSS pattern is a west-east pattern. The SSS value is lower in the east and higher in the west. From July untill December, the higher value of SSS is generally in the middle of the Bay of Bengal. Generally, the value of SSS is higher in July and August, while in December and January the value of SSS is lower. Some results have been compared and consistent with the study of Vinayachandran dan Kurian (2008) and Vinayachandran and Yamagata (1998).]]>
<![CDATA[Oil yield of green microalgae isolated from ponds around Banda Aceh City ]]>
<![CDATA[. Marwan]]>;
<![CDATA[. Suhendrayatna]]>;
<![CDATA[. Bahagia]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Study on CO2 fixation for the growth of oil-produced green microalgae by cultivating the algae in illuminated glass containers was conducted. Green algae were isolated from some water pond samples around Banda Aceh. The samples contain mixed biomasses. The types of microalgae, as the results of the isolation was identified, and then cultivated in the CO2 bubbled containers. The algae growth and oil yield were observed under different mediums (modified Detmer and modified CHU-13) and illumination (2 x 8 watts and 4 x 8 watts). Tanjong Selamat samples were used throughout this research based on initial screening stage. The two medium used led to different growths of the algae; the Detmer medium giving higher growth rate. Faster growth rates were found for cultivation using modified Detmer medium and 4 x 8 watts illumination. The oil yield was determined by solvent extraction method. Oil yield using the CHU-13 medium was 88.5%, much higher than the yield of Detmer medium sample 55.4%. It shows the potential use of local green microalgae to produce alternative bio-oil.]]>
<![CDATA[Screening of shallow groundwater in Aceh Besar and Banda Aceh Districts for contamination with heavy metals ]]>
<![CDATA[Cut Yulvizar]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Tsunami devastated many water infrastructures including the wells. Tsunami areas, land use (rural and urban areas) and land management (agriculture land and home garden) can be leading heavy metals in water quality. The purpose of this research is to investigate how the Tsunami rehabilitation efforts affected the water quality of shallow groundwater by measuring the count of heavy metals (mercury, cadmium and lead by Atomic Absorption Spectrophotometer during the rainy and dry season. Forty-eight water samples’ of wells were collected to determine shallow groundwater from August 2007 to December 2007. The study includes interviews with the owners of the water facilities and sanitary inspection of shallow groundwater wells. The results show the presence Hg and most of Cd in well water are still below the regulatory acceptable limit by Ministry of Health R.I (2002). On the other hand, lead exceeds the regulatory acceptable limit]]>
<![CDATA[A Need for affordable housing in Banda Aceh, Indonesia ]]>
<![CDATA[Nova Iriansyah]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Banda Aceh recently received Adiupaya Puritama award, an award given by the Housing Ministry for cities that have successfully manage its housing and settlement. While there is no doubt that Banda Aceh has made a good achievement in terms of providing housing for its residents, there is always a room for an evaluation of the previous and upcoming policy to improve and to develop a more effective housing policy. Similar to many cities in Indonesia, Banda Aceh experience massive urbanization although in a much smaller scale compare to Jakarta or Surabaya. This has been affected housing stocks in Banda Aceh, in particular the need for more affordable housing for low income residents, which were mostly provided during the tsunami reconstruction program. On the other hand, there is an intense plan to develop a vertical housing (Rusun) to fulfil the need for affordable housing for the public as the land price is increasing. This paper attempts to look at both available affordable housing stocks and upcoming plan of affordable housing for low income residents to support local authorities and other key players in delivering higher quality of affordable housing in Banda Aceh]]>
<![CDATA[Effect of cavitation in cylindrical and two-dimensional nozzles on liquid jet formation ]]>
<![CDATA[Muhammad Ilham Maulana]]>;
<![CDATA[. Jalaluddin]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Cavitation in various nozzles of different geometries and dimensions, i.e., two-dimensional (2D) and cylindrical nozzles, and liquid jets discharged from the nozzles are visualized using a digital camera, and the index for estimating cavitation in a nozzle is discussed. Simultaneous high-speed visualization of cavitation in the cylindrical nozzle and a liquid jet are also carried out to investigate the relation between cavitation and ligament formation. As a result, the following conclusions are obtained: (1) Flow pattern transition in cavitating flows induces the transition in liquid jet patterns. As the liquid flow rate increases, flow patterns of cavitating flows and liquid jets transit from (no cavitation and wavy jet), (developing cavitation and wavy jet), (supercavitation and spray), to (hydraulic flip and flipping jet); (2) When the trace of a cavitation cloud comes out of the nozzle, a ligament is formed at the liquid jet interface. (3) The collapse of cavitation clouds near the exit and induces ligament formation, which, in turn, causes liquid jet atomization; (4) The causal relationship between cavitation cloud and ligament formation holds not only in the two-dimensional nozzle but also in the cylindrical nozzle]]>
<![CDATA[Preparation of asymetric cellulose acetate membrane by phase inversion method of cellulose pulp from wood of sengon (Paraserianthes falcataria) ]]>
<![CDATA[C. M. Rosnelly]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Cellulose acetate ultrafiltration membrane is one of kinds process of membrane which has been utilized in separation and purification processes. Cellulose acetate can be obtained from acetylation of cellulose sengon wood (Paraserianthes falcataria). Wood Sengon was used because it has potential as a raw material. There are three steps of cellulose diacetate manufacturing process: (1) activation of cellulose using acetic acid, (2) acetylation using acetic anhydride as reactant and sulfuric acid as catalyst, (3) hydrolysis. At each operating process was observed at 50oC. Preparation of cellulose diacetate membrane using phase inversion methode by addition of cellulose diacetate as polymer; N,N-Dimethyl formamide (DMF) as solvent, water as non-solvent, and Polyethylene glycol (PEG). Membrane pore size was determined by measuring Molecular Weight Cut Off (MWCO) using Dextran and Bovin Serum Albumine (BSA) as standard solution. Membrane morphology was observed by Scanning Electrone Microscope (SEM). Cellulose acetate of acetyl content of 39.66% and number average molecular weight 130,221 Da was obtained 30 minutes of activation time; one hour acetylation, and 15 hours hydrolysis. The addition of PEG produced a thickner layer and suppress the formation of macrovoid. SEM analysis shows a denser structure membrane morphology with better regularity of pore shape. The resulting membranes which were coagulated at lower temperature shows dense structure. High flux with low rejection obtained from the membrane with greater porosity and pore distribution. MWCO determination was based on the value of 80% rejection of dextran and BSA standard solution and the obtained pore size ranges obtained ≤ 67 kDa, and is still categorized as ultrafiltration membrane]]>
