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<![CDATA[Influence of co-solvent on reactive-extraction of Jatropha curcas L. seed for biodiesel production ]]>
<![CDATA[M. Dani Supardan]]>;
<![CDATA[. Satriana]]>;
<![CDATA[Ryan Moulana]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[In this study, experimental studies have been carried out to improve the yield of biodiesel by addition of co-solvent to enhance the miscibility of the phases and speed up the reaction rate. The co-solvent used are tetrahydrofuran and hexane. The experimental result shows that the transesterification rate was improved when compared to the system without cosolvents. The biodiesel produced in the experiment was analyzed by gas chromatography-mass spectrometry (GC-MS), which showed that methyl oleate was the highest compound in biodiesel.]]>
<![CDATA[Determination of Rock Quality Designation (RQD) through Spectral Analysis Surface Wave (SASW) and Observed Method for Granitic Rock Mass ]]>
<![CDATA[. Asrillah]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Spectral Analysis Surface Wave (SASW) and observation method were carriedout at Kajang Rock Quarry Sdn. Bhd which is located in district Semenyih-Selangor. The objective of this survey is to determinate Rock Quality Designation (RQD) of the granitic rock mass quarried from terrace 9 (highest) to terrace 7. The SASW survey was conducted with using OROS 25 and the software that used for data processing is Winsasw 3.1.3. The Rock Quality Designation (RQD) for terrace 9 varies from 45.63 % to 94.17 %. Base onSuharsono rock classification system, these two values suggest that the rock mass is easy rippable and need blasting. The RQD for terrace 8 are 40.12 %, 72.43 %, 80.35 % and 99.39 % which are classified as easy rippble, hardly rippable, required hydraulic breaker and blasting. The terrace 7 has three RQD show that the rock mass requires hydraulic breaker and blasting]]>
<![CDATA[The Effect of Pb Dopant on The Critical Temperature of BSCCO-2212 Superconducting Crystal ]]>
<![CDATA[. Nurmalita]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[A reseach about the study on the critical temperature of BSCCO-2212 superconducting crystal with slow cooling periode of 90 hours objected for knowing the critical temperature of superconducting crystal. An experiment has been carried out on the formation of BSCCO-2212 superconducting crystal by the melt-textured growth at 9300C. The syntheses were conducted with the molar ratio of the Pb dopant varied between 0 and 0.4 , while the period of the slow cooling process fixed at 90 hours. Characterization of samples with the curve R-T that sample with Pb dopant ratio 0 has the highest critical temperature of 60K and sample with Pb dopant ratio 0.2 and 0.4 has the critical temperature of 57K and 52K respectively]]>
<![CDATA[Fatigue Correstion Behavious of AISI 304 Stainles Steel in 3.5% NaCl Solution ]]>
<![CDATA[Herdi Susanto]]>;
<![CDATA[M. Ridha]]>;
<![CDATA[Syifaul Huzni]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
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<![CDATA[Failuredue to corrosion fatigue is a phenomenon that often occurs in thestructure associated with a corrosive environment. Stepuse ofmaterialssuch as AISI 304 stainlesshas been done, buta failuredue to corrosion fatigue phenomena still occur and can not be understood and explained by the experts. This study focused on assessing changes in behaviorof AISI 304stainless steelareexperiencingrepeatedloadingincorrosive environment. The behavior changes observed with fatigue testing in laboratory air and 3.5% NaCl solution, using a fatigue testing machine typerotary bending, specimens weremadeaccording to ASTME-466 andASTMF-1801 for corrosionfatiguetesting.Fatigue testing presented in S-Ncurve and fracture patterns observed, observed in3.5% NaCl solution and constantstress 369.53 MP apitgrowth measurements done on sevenl evels and four levels of cycles for corrosion potential and current measurements a represented in the polarizationcurve. The results showe dthat the endurance limit of the laboratoryair environment at stress 323.34MPa and 3.5% NaCl solution decreases, up to stress 277.15 MPa at1.7x107cycles. Ductile fracture pattern is in the airand 3.5% NaCl solutionis brittle. Pits and cracks growth, failure is dominated by crack propagation and increase the number of cycles resulting in decreased surface potential and corrosion current density increases.]]>
<![CDATA[The Use of a Consortium of Chlorella vulgaris and Pseudomonas putida for Bioremediation of Artificial Sugar Wastewater ]]>
<![CDATA[. Zuhra]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Sugar wastewater can be a serious problem for environment because of highorganic content namely nitrogen concentration. Other problems caused by the waste are unpleasant colour and an inferable smell. The appropriate treatment is needed for solving the problems. The growth of algae in the pool of waste was suggested as the propertreatment for sugar wastewater. The aim of this research was to study the use of Chlorella vulgaris for the treatment of artificial waste water. Chlorella vulgaris was cultured in artificial wastewater having low pH.Pseudomonas putida was used to supply CO2 for photosynthesis process in a lagoon tank and it was added at the second day. Polyacrylate polyalcohol was also introduced to provide buoyancy effect of the medium All of the experiments were conducted in a rectangular tank using the artificial illumination and it wasalso equipped by air pump to supply oxygen and circulate the waste in the tank. pH, Dissolved Oxygen (DO), Optical Density (OD), Chemical Oxygen Demand (COD) and Total Nitrogen (TN) were measured daily during the experiments. COD was successfully reduced up to 6900 mg/l and 29% of COD removal at the fourth day. The low pH experiments demonstrated the effectiveness of a consortium of algae and bacteria at TN removal from wastewater by reducing the TN from 70 mg/l to below 35 mg/l. According to the above results, it can be concluded that the consortium of Pseudomonas putida and Chlorella vulgaris was applicable as one of alternatives for sugar wastewater treatment]]>
<![CDATA[Efficient Photocatalytic Hydrogen Generation by Pd Modified La-NaTaO3 Nanoparticle ]]>
<![CDATA[Husni Husin]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[The advantage of palladium modified La-doped NaTaO3 (Pd/La-NaTaO3)semiconductor photocatalyst for enhanced hydrogen generation under irradiation at the ultraviolet range has been investigated. The La-NaTaO3 has been synthesized by sol-gel technique. The palladiums are loaded by impregnation of aqueous palladium nitrate solution. The palladium supported of La-NaTaO3 composites are characterized by transmission electron microscopy (TEM), high-resolution HRTEM (HRTEM), and X-ray absorption spectroscopy (XAS). The HRTEM images indicate that Pd nanoparticles (NPs) aredeposited on the surface of La-NaTaO3. Most of the Pd deposits have diameters ranging from 3 to 4 nm. XAS spectra shows that the Pd-La-NaTaO3 absorbance profiles of the pristine and used samples are overlapped with the Pd foil, indicating that oxidation of the fresh and used cocatalyst was identical in nature with that of the palladium foil. Hydrogen production from pure water irradiation with ultra violet (UV) light source is 1.1 mmol g-1h-1 on La-NaTaO3 photocatalysts. The activity of the La-NaTaO3 up to 8.9 mmol g-1h-1 H2 froman aqueous methanol solution are obtained. The hydrogen evolution on the La-NaTaO3 sample can be further increase of 36.49 mmol g-1h-1 or 4.1 times higher by depositing nanosized Pd as a cocatalyst on the surface photocatalyst. The highest hydrogen generation is observed at 0.15 wt% Pd loading. The higher activity of the Pd/tantalates from aqueous methanol solution is attributed to an important suppressing in the electron–hole pairs recombination due to the effect produced by the presence of La in the NaTaO3 structure as well as by the role of methanol acts as hole-trap and Pd like electron-trap.]]>
<![CDATA[Mercury in sediment and freshwater organisms from Kr. Sikulat River around the artisanal gold mining plants in Sawang, Aceh Province, Indonesia ]]>
<![CDATA[. Suhendrayatna]]>;
<![CDATA[. Elvitriana]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Artisanal gold miners in Sawang use mercury in gold separation process. The workers put gold ore and mercury into the tumblers to extract gold and silver by amalgamation method. After gold and silver are isolated from the ore as amalgam, mercury is vaporized by burning with an oil burner. Furthermore, wastewater containing mercury is discharged at landfills and Kr. Sikulat River stream. With the purpose of knowing the impact of small-scale gold mining plant in Sawang, the concentrations of mercury in Kr. Sikulat River sediment and the accumulation of mercury in tissues of freshwater organisms from Kr. Sikulat River were investigated. Sediments were taken from locations near the gold mining plant and freshwater organisms were caught in the estuary from Kr. Sikulat River. Samples were transported live to the laboratory and sampled dissected after death. Tissue from each organism were removed and grained after dried. Total mercury analyzed using an Atomic Absorption Spectrometry (AAS), AA-6300 Shimadzu. The results showed that the concentration of mercury in sediment found 0.0339 mg-Hg/kg, while the concentration of mercury in the water phase were found 0.005 – 0.047 mg-Hg/L. Mercury was also found in the concentration of 0.1903 mg-Hg/kg accumulated in the shellfish, but it was not found accumulated in other freshwater organisms such as fish and shrimp. Based on these results, a regular monitoring program in Kr. Sikulat River is necessary conducted in order to better elucidate the rate of bioaccumulation and biomagnification by organisms]]>
<![CDATA[Fourrier Transform Infrared and Gel Permeation Chromatography Evaluation to Prepared Polyurethane Paint from Polyol Palm Oil Based ]]>
<![CDATA[Teuku Rihayat]]>;
<![CDATA[. Suryani]]>;
<![CDATA[Pocut Nurul Alam]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[New emulsion type paint was prepared by utilizing polyol for the production of polyurethane by reaction with an isocyanate was obtained by the synthesis of palm oil-based oleic acid with glycerol. Dodecylbenzene sulfonic acid (DBSA) was used as catalyst and emulsifier. The various methods for preparing Polyurethane /clay Nano composites, but in this research the author choice by a pre-polymer method and were evaluated by Fourier Transform Infrared (FTIR) spectra to determine micro-domain structures of segmented PU. The molecular weight (MW) of polyol was obtained by using gel permeation chromatography (GPC) and the result was about 950. The micro domain structures of the segmented PU were analysed by FTIR by following the work of Seymour et al. to estimate the degree of phase separation in segmented PU. The formation of hydrogen bonding by –C=O group can be determined by examining the peak position at 1709 cm-1 for hydrogen bonded –C=O and at 1731 cm-1 for free –C=O. The molecular weight (MW) of PU based on palm oil was about 3.266. The performance characteristics of materials indicate to be comparable with the corresponding industrial standard]]>
<![CDATA[Effect of Process Variables on Cr (IV) Removal from Liquid Waste Using Guava Leaf (Psidium guava) ]]>
<![CDATA[. Mariana]]>;
<![CDATA[. Hisbullah]]>;
<![CDATA[Komala Pontas]]>;
<![CDATA[Ferry Soraya]]>;
<![CDATA[Purwana Satriyo]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[The removal of Cr(IV) in aqueous solution by Guava Leaf (Psidium Guajava) as a bio-sorbent was experimentally investigated. The experiment was carried out in a batch stirred reactor at room temperature. The effects of certain parameters, such as concentration of bio-sorbent and contact time, were investigated. The removal increased with contact time and concentration of bio-sorbent. The results showed that the contact time is directly proportional to the sorption capacity and the sorption efficiency. The sorption efficiency of Cr (VI) was highest at 5 grams bio-sorbent, while the sorption capacity of Cr (VI) was highest in bio-sorbent 1 gram under current experimental condition. The optimum removal of Cr (VI) using guava leaves occurred while stirring 30 minutes.]]>
<![CDATA[Multiagent Based Tsunami Evacuation Simulation: A Conceptual Model ]]>
<![CDATA[Khairul Munadi]]>;
<![CDATA[Yudha Nurdin]]>;
<![CDATA[. Nasaruddin]]>;
<![CDATA[M. Dirhamsyah]]>;
<![CDATA[Sayed Muchalil]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[During emergency situation, such as a large-scale tsunami or other disastrousevents, people evacuation may lead to more fatalities when it is conducted without a proper escape strategy. The ability to evacuate a huge number of people within a very limited amount of time is certainly required. Evacuation drills are therefore necessary to acquire an optimal escape strategy. Unfortunately, we have to deal with both financial and practicalchallenges for conducting a regular and meaningful drill. To overcome these challenges, one solution would be to develop the evacuation simulation model. Despite its limitation to mimic the real-life situations, simulation may provide practical ways of minimizing the negative consequences as well as useful insights to escape strategy. In this paper, we describe a conceptual model of multiagent based tsunami evacuation simulation (TES). The model formulation and description would follow the ODD (Overview, Design concepts, andDetails) protocol, which is a standard protocol widely used by agent-based modellers. The proposed model may serve as a framework for TES that offers the following features: estimate the clearing time or the time needed by people to leave the tsunami inundation area, and identify the potential bottleneck or congestion locations. Using the proposed conceptual model, we consider constructing the TES for Calang district, a coastal area in Aceh Jaya regency, for future work]]>
