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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 163 Documents

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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%.

Molecular Conformation and Thermal Diffusivity by Temperature Wave Analysis of Electric Polarized Biaxially Stretched Polyethylene Terephthalate Films Satoto, Rahmat; Nugroho, Pramono
Teknologi Indonesia Vol 32, No 2 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i2.4

Structural and conformation of biaxially polyethylene terephthalate (PET) films after being polarized by electricfield was characterized using Fourier transform infrared (FTIR). The 950 kV/cm electric field was applied during the sample heating and cooling at 28-100-28oC. The electric field was directed to the sample thickness. Thermal diffusivity of the polarized PET films in the thickness direction was characterized using temperature wave analysis (TWA) as a function of temperature. An orientation function of 1719 cm-1 band which was assigned to a permanent dipole of C=O, shows an increasing orientation with the increase of polarization field. Thermal diffusivity also increased with the increasing of electric polarization field. The orientation function of 1340, 971 and 847 cm-1 bands did not show a clear tendency due to the polarization field. The correlation of molecule conformation change and thermal diffusivity in the biaxially stretched PET films is discussed.

PREPARATION OF DFA III FROM DAHLIA (DAHLIA sp.) TUBERS BY NONOMURAEA sp. INULIN FRUCTOTRANSFERASE pudjiraharti, sri
Teknologi Indonesia Vol 39, No 1 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i1.252

A functional oligosaccharide Difructose anhydride III (DFA III) can be made enzymatically from inulin. Inthis research, tubers of Dahlia plant (Dahlia sp.), which is known as one of the sources of inulin, was processedinto chips form and utilized for DFA III preparation using Nonomuraea sp. Inulin fructotransferase (IFTase). Priorto drying process, Dahlia tubers were blanched first at different blanching times (5, 10, 15, 20, and 25 minutes) tofind out the optimum time to produce white and clear chips. To study the influence of IFTase concentrations andreaction time on DFA III production, 10 g of Dahlia chips were reacted with different concentrations of enzyme35, 70, 140, 210, 280 U in 200 ml reaction mixture and incubated at different periods of time (3, 6, 9 and 12hours). DFA III produced was measured by High Performance Liquid Chromatography (HPLC) method. The resultindicated that blanching in boiling water for 15 minutes resulted in chips with clear and white color. It was alsoobserved, the higher the amount of enzyme used and the longer the incubation period, the higher the concentrationof DFA III resulted. Statistical analysis using single-factor Anova and t-test for P=0.05 showed that reaction forDFA III production using enzyme concentration of 35 U was significantly different from that using 140, 120, and280 U; reaction using enzyme concentration of 210 was significantly different from that of 280 U. However, DFAIII production using enzyme concentration of 35 U was more effective than using the higher one. DFA III of 0.83g was produced using enzyme amount of 35 U, while 1.45 g DFA III produced using 280 U can increase DFA IIIpercentage up to 73.86%.

ANALISIS HASIL UJI TERAP ALAT PENGHEMAT BBM ELECTRIC FUEL TREATMENT PADA ENGINE DIESEL GENSET 35 KVA DENGAN BEBAN STATIS Hariyadi, -; Sugiono, -; Fakhrurroja, Hanif; Tanu, Edy
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

This paper describe fi eld test results analysis for fuel saving tool called Electic Fuel Treatment (EFT) on diesel engine generator set 35 KVA with static load. Field test on diesel engine generator set was performed with a variety of confi gurations EFT in series or parallel to get the best fuel effi ciency. Methods of analysis done bythe operational technical tests by comparing the results of testing before and after installation of EFT. Field test results are a form of EFT confi gurations that is ideal to obtain fuel effi ciency on average of 6.58% at 60% load and exhaust emission reduction levels between 20%24%.

Dye-Sensitized Solar Cells Based on Carbon Nanoparticle Counter Electrode Muliani, Lia; Nursam, Natalita
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

The performance of dye-sensitized solar cells (DSSC) is affected by its components. One of the affecting factors is counter electrode. Counter electrode has a function as a catalyst to fasten reaction kinetics during the tri-iodide reduction reaction within the cell. In this paper, the fabrication process of DSSC based on carbon nanoparticle counter electrode is described. The carbon nanoparticle was prepared into carbon paste with variation of solvent. The carbon nanoparticle paste was deposited onto FTO glass substrate (fl uorine-doped tin-oxide) by screen printing tehnique using stainless steel screen. The Characteristic of I-V curve of carbon counter electrode cells was measured using Oriel Sun simulator AM 1.5 with the light intensity of 40 mW.cm-2. The result was compared to cells which are based on platinum counter electrode. The best effi ciency of the cell obtained was 2.0%. and 3,12% for carbon nanoparticle and platinum counter electrode, respectively.

CULTIVATION OF FILAMENTOUS CYANOBACTERIA FOR VALUABLE BIOPRODUCT USING SAGO SOLID WASTE AS SUBSTRATES Susanti, Hani; Lestari, Sari; Rahman, Delicia Y.; Susilaningsih, Dwi
Teknologi Indonesia Vol 37, No 1 (2014)
Publisher : LIPI Press

Sago solid waste as by product result of sago palm processing potentially have great value for some bio processing such as source of carbon on microbes substrate. Utilization of sago solid waste as substrate for filamentous cyanobacteria cultivation is a rareresearch activity in Indonesia as one of the three leading world companies producer of sago starch. Therefore, we focused on sago waste treatment using cyanobacteria agent in order to rid the waste and gain the value of nutrition rich starch from that waste. Several concentrations of growth media contain sago solid waste were tested into cyanobacteria culture and solid waste hydrolysis as pretreatment more conducted in the research. Result shows that addition of sago solid waste (50, 500 and 5000 ppm) into media can increase the algae biomass production which is rich of carbohydrate and protein.The proximate value of biomasses with sago solid waste treatment was exhibited significantly higher than control. During cultivation exposure time, the solid waste is gradually consumed by the algae. The study implies that sago solid waste can be used as substrate for the biomass production of filamentous cyanobacteria which is known as source of active compounds, potential resource for valuable bioproduct.

PRODUCTION OF WOOD CHARCOAL AS BIO-REDUCTOR IN BLAST FURNACE Isnugroho, Kusno; candra, david
Teknologi Indonesia Vol 38, No 3 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i3.242

A study on bio-reducer using lamtoro and rubber wood raw materials had been conducted. This study used carbonizing furnace made from mild-steel which was equipped with absorber to reduce emitting exhaust gas during process. The absorber used came from activated zeolite inserted with TiO2. Carbonizing process was conducted in 700C, 800C, and 900C temperatures. The produced results, both from lamtoro and rubber wood raw materials, underwent reduction along with increasing carbonizing temperatures. Yields from rubber wood at 700C, 800C, and 900C were 23.12%, 21.32%, 20.26%, respectively, and yields from lamtoro wood at 700C, 800C, and 900C were 26.51%, 25.13%, and 24.12%, respectively. Ultimate and proximate test using ASTM D.3174, ASTM D.3173, ASTM D.3175, ASTM D.5373 and ASTM D.4239 showed that bio-reducer product in form of charcoal made from lamtoro and rubber wood had fulfilled specifications as a reducer in iron ore processing. Test result of emitting exhaust gas showed reduced CO and NOx gases during carbonizing process.

DISTRIBUTED CONSTRAINTS SATISFACTION FOR MULTI AGENT SYSTEM Arisal, Andria
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.27

Multi agent system usually has to solve problems with some specifi c constraints, which are possibly to be over constraint. Moreover multiagent system has to utilize existing agents with their limited constraints knowledge. To address this problem, we use one distributed constraint satisfaction problem algorithm, asynchronous incremental relaxation in extreme kitchen domain. This algorithm uses multivalue backtrack with threshold value has proven able to solve over constraints problem by suggesting goal with the least constraint violation.

THE SUBSURFACE STRUCTURE INVESTIGATION OF DIENG PLATEUAU, CENTRAL JAVA, INDONESIA BY USING THE MAGNETOTELLURIC DATA Gaffar, Eddy Zulkarnaini
Teknologi Indonesia Vol 40, No 1 (2017)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar

Dieng Plateau area has a geothermal energy power station with a capacity of 60 MW. Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI) tried to expand the productive areas in Dieng to other prospective areas around Dieng Plateau using the Magnetotelluric method. Magnetotelluric measurement was done by taking path stretching from east to west and from north to south comprising of 24 locations, each with a distance of 2 to 4 km. The tools used are Phoennix MTU-5A by using two kinds of coils, namely MTC-30 for high frequency 1,000–10.000 Hz and MTC-50 for low frequencies from 0.00001 to 400 Hz. Three lines for the two-dimensional cross section were made. From the three cross-sections, there are rocks with resistivity value of ≤32 Ωm interpreted as soft rock or alteration rock and Dieng volcanic rocks as cap rock. Under the cap rock, there are rocks with resistivity value between 64–1.000 Ωm with thickness of about 1,000–2,000 meters which are interpreted as volcanic clastic rocks and lava from Jembangan, Damar, and Ligung Formation as reservoir rocks. In the very bottom rock, there are rocks with resistivity value of ≥1,000 Ωm interpreted as igneous rock which still contain heat from the Quaternary intrusion that are not exposed at the surface and the Kumbang Formation consists of andesite and basalt lava. The developing structure is classified as normal fault structures as seen on all of the line that make the reservoir trap better. On the western region, namely Wanayasa area and the north west area of Mangunan, there were rocks with the same system and structure as found on the eastern area (Dieng prospect area). Therefore, in addition to current productive Dieng area, there are also other prospective areas in Wanayasa and Mangunan area.

EVALUASI CADANGAN MINYAK ZONA A DAN B, LAPANGAN RAMSES, BLOK D, MELALUI PEMODELAN GEOLOGI BERDASARKAN DATA PETROFISIKA Iqbal, Prahara; Mardiana, Undang
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.55

Geology modelling has been done in Zone A and B, Ramses field, Blok D. The modelling was conducted by determining Zone A and B as zone having to be checked based on gamma ray, resistivity, and densitiy curve integrity reading (qualitative analysis) and petrophysic analysis which used GS software (quantitative analysis). Then the data were entered into IRAP RMS 7.3 software. The results are Zone A and B geology modelling and also oil concentration modeling which describe the biggest area of oil concentration, plus the oil amount. the result showed that, the biggest area of oil concentration is at south of each zone. The oil amount are: Zone A=82,78 million barrel, Zone B=36.08 million barrel.

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