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Teknologi Indonesia

JTI
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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 01261533 EISSN : 23031913 DOI : -

Core Subject : Science,

Computer Science & IT

JTI is a journal in the Departement of Engineering Sciences - Indonesian Institute of Sciences (LIPI). JTI has policy to publish a new and original research paper or a review paper in The scope of Technology. JTI publishes two issues per year. The journal has been registered with printed-ISSN number as 0126-1533 and electronic ISSN number as 2303-1913.

Arjuna Subject : -

Articles 7 Documents

Search results for , issue " Vol 37, No 2 (2014)" : 7 Documents clear

COAGULATION-FLOCC ULATION EFFICIENCY LEVEL OF WATER TREATMENT PLANTPROTOTYPE Sutapa, Ignasius Dwi Atmana
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v37i2.223

Surface water is a potential water source for public to be processed into clean water. Coagulation-Flocculation is an important process in drinking water treatment because it has major influence on the purification process and quality of produced water. The objective of the study is to assess the efficiency of coagulation-flocculation processes in compartments which is arranged in series of flocculators tank, a sedimentation tank, and water production tank. A prototype of water treatment plant with capacity of 30 l/min was used in the experiment. The results showed that the composition of the six series compartments flocculator was able to give better efficiency of coagulationflocculation process. Process of species forming and destabilization of colloidal particles occured in compartmentK0 and K1. Flocculation process started in compartment K2. Raw water turbidity was in the range of 18 NTU, gradually decreased to 6 NTU with 66.67% efficiency rate. Water turbidity decreased during the sedimentation and filtration processes. Result in final processing was almost 0 NTU with the level of efficiency close to 100% and the pH value of the clean water was 7.3.

Effect of Location, Building Shape, and Wind Turbine Position on the Building for Maximum Wind Energy Potential in Rapid Development Area Sari, Dany Perwita
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

High population growth, climate change and energy crises raised awareness in Indonesia especially in Yogyakarta Province which has already arrived at the extreme limit and has been made predominantly for high-rise building design. High-rise building integrated wind turbine is a technology that accelerates wind power from the building elevation. This paper investigated wind velocity on the high-rise building for wind power based on location (wind climate data analysis), building aerodynamic shape and wind turbine position. In the beginning of the study, numerous famous high-rise building was redesigned and simulated using CFD simulation to find the most effective building design. The redesign and simulation were then validated using wind tunnel experiment. Thispaper focuses on guidance resulting on wind power density of Yogyakarta Province to predict the wind energy. The prediction was then combined with best design of aerodynamic building. The result shows that building energy can be optimized through aerodynamic building design, wind turbine position and best geographic area and climate to achieve maximum wind power.

Fabrication of Bulk Heterojunction Polymer Solar Cells Rosa, Erlyta Septa; Shobih, -
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

In the present work, we used blends of MDMO -PPV [poly(2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylene vinylene)] together with the soluble fullerene C60 derivative PCBM [6,6 phenyl C61-butyric acid methyl ester] as an active layer for bulk heterojunction solar cells. Here, we used a spin coating to deposit a thin and smooth active layer from chlorobenzene solution. An 100 nm thick film of a water solution poly(ethylene dioxythiophene) doped with polystyrene sulphonic acid (PEDOT:PSS) was first spin coated onto an indium tin oxide (ITO)/glass substrate. The PEDOT:PSS layer was then dried in a vacuum oven for 60 minutes at 120C. The active layer, consisting of a blend of the MDMO-PPV and PCBM was then deposited onto the PEDOT:PSS layer from a chlorobenzene solution using spin coating technique. For the cathode, an 134 nm thin film of aluminum was resulted from a thermal evaporation process onto the active layer through a shadow mask to define an active device area of 2,6 cm2. For characterization, the devices was illuminated by a xenon lamp at the intensity of 27 mW/cm2. The temperature ofthe device during characterization was approximately 25C. The device gave an open-circuit voltage of 0.979 volt, a short-circuit current of 0.059 mA, a fill factor of 0.730, and a power conversion efficiency of 0.06%.

CHARACTERIZATION AND MICROWAVE-ASSISTED HYDROLYSIS OF SAGO STARCH TO PRODUCE MALTODEXTRIN Fajriutami, Triyani; Laksana, Raden Permana Budi; Hermiati, Euis
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

Sago (Metroxylon sagu Rottb.) starch is one of potential sources of starch in Indonesia; however, it has not been widely used as industrial raw material for modified starch, such as maltodextrin, which has higher addedvalue than the native sago starch. The aim of this study was to develop the processing technology of maltodextrin production from sago starch using microwave irradiation. The addition of activated carbon had a significant effect on the sugar produced in the microwave-assisted hydrolysis. The longer the duration of microwave irradiation the higher the total dissolved solids in the filtrate, and the lower the pH values. The increase of the microwave power level from 550 to 770 W significantly affected sugar content of the hydrolysates. Suitable Dextrose Equivalent (DE) value of maltodextrin (?20) can be obtained after hydrolysis for 10 to 12 minutes at the power level of 550 W or 6 to 8 minutes at the power level of 770 W.

PRELIMINARY STUDY OF PYROLYSIS OF CACAO POD HUSKS AND PRODUCT YIELDS IDENTIFICATION Mansur, Dieni
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

Pyrolysis of cacao pod husks as one of agricultural crop residue took place in a fixed bed type of pyrolyzer under atmospheric pressure at 500oC. The process was studied by varying methods and temperature of feeding.The effect of N2 flow rate as carrier gas was also investigated. These effects influenced yield of product after pyrolysis especially on the char. Char as the main product of pyrolysis was recovered as 70 C mol% with one step feeding at 25oC under 20 ml/min of N2. Pyrolysis of cacao pod husk also produced bio-oil that consisted of several chemical compounds such as aliphatic and cyclic ketones, carboxylic acids, furans, aldehydes, alcohols, phenols and heterocyclic aromatics.

TECHNO-ECONOMIC COMPARATIVE STUDY OF VERY LOW HEAD HYDRO POWER: CASE STUDY IN BINTAR VILLAGE, NUNUKAN, EAST KALIMANTAN Subekti, Ridwan Arief; Irasari, Pudji
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

This paper discusses techno-economic comparative study of very low head hydro power (VLHHP) between the penstock and non-penstock systems. The selected location is river current in the Bintar Village, Nunukan, EastKalimantan. The technical analysis is performed to determine the generated potential power, the type of components used and the investment cost per kW needed. The economic analysis is then conducted by implementing IRR and NPV methods to find out whether the project is economically feasible to be executed. The technical analysis results exhibit that the generated power using penstock system is higher than that of using non-penstock system; that is, 5.70 kW. The power of non-penstock system of 3.336 kW could be attained by applying modular system comprised by 4 units of propeller turbines installed in parallel. The economic analysis shows that the penstock system requires higher investment cost that is Rp58,480,272 and both systems are not feasible to be realized since they have negative NPVs. It is, therefore, recommended to fund the project through grant.

RESEARCH AND DEVELOPMENT OF NANO-STRUCTURED CAPACITOR MATERIAL BY USING ?-IRRADIATION Yunasfi, -; Mustofa, Salim
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v37i2.218

Research and development on the usage of g-irradiation against nano-structured graphite which is suitable for capacitor material has been carried out. The nano-structured graphite in the form of pellet was irradiated by g-ray with variation of dose, from 100 kGy up to 600 kGy. In this research, the analysis of phase changes, the change of electrical resistivity (r), dielectric constant (er) and dielectric loss (tan d), have been carried out to the nano-structured graphite after irradiated by g-ray. The results of XRD showed that g-radiation could decline the peak intensity. The peak intensity decreased with the addition of radiation dose. Electrical resistivity values (r) also fell as an impact of g-radiation, where the decline continues with increasing radiation dose, while the value of the dielectric constant (er) has increased by g-radiation and increased steadily with the increasing of radiation dose. For the case of tan d t?? he tendency was decreased by the g-radiation and this decline continued with the increasing radiation dose. This fact suggests that there has been an interaction between g-radiation with graphite particles which can cause the impactof changes in the structure of graphite. More impact of changes in the structure of graphite is assumed that greater of energy can be stored, thus diminishes the r value and tan d, while the value of er increases.

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