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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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THE INFLUENCES OF APPLIED STRESS, TEST TEMPERATURE AND CONCENTRATION ON ENVIRONMENT INDUCED CRACKING OF Ni3(Si,Ti) INTERMETALIC COMPOUND IN NEUTRAL SODIUM CHLORIDE SOLUTIONS priyotomo, gadang
Teknologi Indonesia Vol 38, No 1 (2015)
Publisher : LIPI Press

The environment-induced cracking (EIC) behavior of Ni3(Si,Ti) intermetallic compound was investigated as the function of applied stress, test temperature, and chloride-ion concentration in NaCl solution using a constant load method. From the applied stress dependence of the three parameters ( tf, lss and tss/tf ), the relationships were found to be divided into three regions: stress, EIC, and corrosion dominated regions. The ratio of tss/tf in the EICdominated region was independent constant of applied stress, test temperature, and chloride-ion concentration. Furthermore, the relationship between log tf and log lss in the EIC-dominated region became a good straight line, irrespective of applied stress, test temperature, and chloride-ion concentration. The fracture appearance in the EIC dominated region was intergranular. On the basis of the results obtained, an intergranular EIC was supposed to be influenced by hydrogen entry, dissolution, and film formation.

UJI METODE ANALISIS MINYAK TERDISPERSI DALAM AIR Nuryatini, -; Wiloso, Edi Iswanto
Teknologi Indonesia Vol 33, No 1 (2010)
Publisher : LIPI Press

Test on the method of analysis to determine oil dispersed in water has been carried out using an instrument, OCMA-350 Horiba based on infra red absorption. The oil samples used in this test were B-heavy oil, cutting oil, and diesel oil. The results of the experiment indicate that the calibration of the OCMA -350 Horiba needs to be done by using the standard oil according to the type of oil tested. The use of the method for all oil tested shows good results. The B-heavy oil in the water with a concentration 179 mg/L gave a recovery of 99.04%, with variant coeffi cient 1.48% and detection limit of 0.54 mg/L. Similarly, the cutting oil with concentration 178 mg/L gave a recovery value of 99.51%, with variant coeffi cient of 2.49%. Finally, the analysis of diesel fuel in the water at concentration of 84 mg/L gave a recovery value of 100.32% with variant coeffi cient 3.71%

PRODUCTION OF Nonomuraea sp. ID 06-A0189 INULIN FRUCTOTRANSFERASE AND PREPARATION OF DFA III FROM INULIN USING THE ENZYME Pudjiraharti, Sri
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.266

Inulin Fructotransferase (IFTase) converts inulin into difructose anhydride III (DFA III), a functional oligosaccharide. The aim of this study is to find out optimum aeration rate for IFTase production by Nonomuraea sp. ID06-A0189 in 1.5 L fermenter scale. Fermentation was conducted at 30 o C, pH 7.0, 150 rpm and different aeration rates (0.5, 0.75, and 1.0 vvm) for four days. The results showed the higher the aeration rate used, the higher the enzyme activity produced. The highest activity of 9.3 U/mL was produced at 1.0 vvm after 4 days. To find out the ability of inulin fructotransferase to convert inulin into DFA III, the crude enzyme was applied in 50 mL reaction mixture containing 50 and 100 g/L inulin, pH 5.5, 65 o C, for 12 hours. DFA III concentration was measured by high performance liquid chromatography (HPLC). The result indicated the highest DFA III concentration of 56.7 g/L was resulted after twelve hours with the conversion yield of inulin into DFA III was around 57%

HORSERADISH PEROXIDASE (HRP) ACTIVITY OF ARMORACHIA LAPATHIFOLIA SUBCULTURED CALLUS IN SOLID AND LIQUID MEDIA Budiwati, Thelma A.; Pudjiraharti, S.; Karossi, A.T.
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.51

Peroxidase is an enzyme which catalyzes the oxidation of organic compound done by peroxide. The peroxidase enzyme can be produced by plants or microorganisms. One of the peroxidase enzymes is Horseradish Peroxidase (HRP). This commercial, HRP is produced through the extraction of Horseradish root (Armorachia lapathifolia) besides it can also be produced through tissue culture. The callus induction was carried out in Linsmaier-Skoog media containing naftalen acetic acid (NAA) and benzyl amino purin (BAP) as the growth hormone. Incubation was conducted at room temperature (2428oC) without lighting anymore for three weeks, At the age of three weeks some of the calli were subcultured in solid media, and the rests were subcultured in liquid media containing growth hormone NAA and kinetin. Incubation was in a shaking incubator at 120 rpm, without light, at the room temperature for 40 days. The sampling was conducted every 10 days. The results of the research showed that the 8th (SC8) and the 10th (SC10) subcultures produced the highest extracellular and intracellular enzyme activity at the age of 20 and 30 days. The extracellular enzyme activity was 38.06 U/ml with specific activity 22.36 U/mg protein and the total activity of 79.92 U. While the intracellular enzyme activity was 253,82 U/g callus, with specific activity of 39.05 U/mg protein and total activity of 649.77 U.

Performance Evaluation of Friction Materials for Railway Brake Application Using Oil Palm Empty Fruit Bunch Fiber as Reinforcement Alam, H.S.; Puja, IGN W.; Suratman, R.
Teknologi Indonesia Vol 35, No 3 (2012)
Publisher : LIPI Press

Performance of friction material for railway brake applications using oil palm empty fruit bunches (OPEFB) fibers as reinforcement has been evaluated using extension evaluation method (EEM) refers to the technical specifications of PT. KAI. Characterizations of two commercial samples, K1 and K2, were used as a reference and a preliminary study to develop railway brake materials using OPEFB fi bers. Six samples of non-commercial brake that use OPEFB fi bers, T1 to T6, were made with different compositions and then tested with samples of K1 and K2. The results of the tests were used as input of evaluation to select the best samples of brake material. Base on the results of evaluation using EEM, samples T1 and T4, which used OPEFB fi bers as reinforcement ranked above the commercial sample K2 which used synthetic fi bers, so it can be concluded that OPEFB fi ber as reinforcement for railway brakes can improve the physical and mechanical properties, have excellent performance, friendly to the environment and is expected to replace synthetic fibers.

THE EFFECT OF COAGULANT TYPE ON COLOR REDUCTION VARIATION PATTERN OF PEAT WATER IN COAGULATION-FLOCULATION PROCESS Sutapa, Ignasius D. A.; Toruan, Reliana L.
Teknologi Indonesia Vol 37, No 3 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v37i3.226

Peat water has a wide variety of organic content; one of those is humic acid which looks like a seemingly brownish red color on the water. In a clean water system, the requirements that can be used for consumption islow intensity of color 15 TCU, while the peat water at Sala river was 540 TCU. Coagulation process has been known to affect the color reduction on peat water, but it is not yet known exactly how the optimum concentrationof coagulant. The aims of this study was to determine of PAC and alumunium sulphate effect to variation pattern of color reduction on peat water coagulation process, so that the optimum coagulant dosage, precipitation time and efficiency would be found out. The method used in the coagulation process was jar test. Based on this research, PAC and Aluminum sulphate optimum dosis were 180 ppm and 160 ppm, respectively. By such a dose, the color of the peat water can be reduced which is shown by the intensity of the color variations pattern. The efficiency of PAC within reduced peat water color was 99.63% (540 ppm to 2 ppm) and cost required was Rp 1800/day for 1 m3. Meanwhile, the efficiency of Alum was 95.37% (540 ppm to 22 ppm) and cost required was Rp 640/day for 1 m3. The use of PAC is considered more efficient and profitable than that of Alum, because using Alum needs peat water pH neutralization, and then it hikes the cost of peat water treatment. So, PAC is recommended on the scale of peat water treatment plant.

Effect of Electric Polarization on Thermal Diffusivity of Biaxially Stretched Poly (ethylene terephthalate) Films Satoto, Rahmat
Teknologi Indonesia Vol 32, No 2 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i2.5

The effect of the electric field polarization on the thermal diffusivity of biaxially stretched poly (ethylene terephthalate) (PET) films had been examined. The change in the thermal diffusivity as a function of temperature was measured by temperature wave analysis (TWA) technique. The thermal diffusivity at room temperature increases with the increasing of the polarization electric field. The thermal diffusivity decreases with the increasing of the temperature. The decrease of thermal diffusivity by the increase of temperature could be caused by the effect of carbonyl depolarization. The glass transition temperature, Tg, decreased with the increasing of the polarization electric field. The increase of thermal diffusivity is due to the increase of carbonyl polarization of the PET. Segmental orientation of carbonyl in the thickness direction played an important role in the thermal diffusivity. These results implied that the temperature dependence of the thermal diffusivity was related to the change of the dipolar relaxation and microstructure of PET.

HYDROTHERMAL LIQUEFACTION OF BLACK LIQUOR INTO PLATFORM CHEMICALS Mansur, Dieni; Simanungkalit, Sabar Pangihutan; Rinaldi, Nino; Abimanyu, Haznan
Teknologi Indonesia Vol 39, No 1 (2016)
Publisher : LIPI Press

Currently, much attention is devoted to produce bioethanol based on lignocellulosic materials for alternativefuels. Production of bioethanol from lignocellulosic generates black liquor as a waste during the pretreatmentprocess. The black liquor has a potential to produce platform chemicals. Conversion of black liquor into platformchemicals was carried out by hydrothermal liquefaction by involving water as reaction medium at 200275 C.Through the hydrothermal process combined with water at high temperature, catalytic role could be taken over bysodium sulfate. Increase in temperature up to 275C, activity of water combined with sodium sulfate also increasedin decomposition of block chemicals containing in the black liquor. The black liquor was converted into oxygenatedcompounds, such asphenol, propylene oxide, butyrolactone, and quaiacol. The chemicals were recovered as23, 16, 11 and 8 mol%, respectively.

STUDI DESAIN ALUR GAS PADA ANODA PLAT BIPOLAR DAN PENGARUHNYA TERHADAP PERFORMA PEMFC BERDASARKAN HASIL EKSPERIMEN Indriyati, -; Pujiastuti, Sri; Lazuardi, -; Isya, Nini
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.42

The effect of the anode fl ow fi eld design on the performance of Proton Exchange Membrane Fuel Cell (PEMFC) with an active area 9 cm2 was investigated experimentally. 3-channel serpentine, 5-channel serpentine and modifi - cation of serpentine-parallel fl ow fi elds has similar channel cross section, 1.35 mm for channel width, 0.55 mm for channel depth, and 0.7 mm for the land between channels. They were tested with hydrogen fl ow rate of 50 ml/min, oxygen flow rate of 250 ml/min, pressure 1.5 Bar, and dew point temperature 80C at 100% relative humidity. The experimental results obtained from measurement of current (I) and potential (V) indicated that 3-channel serpentine exhibited higher performance than others even though it was not so significant. At current density of 20 mA/cm2, modification serpentine-parallel design showed signifi cant potential drop, probably due to turbulence gas flow inside the channel. Open circuit voltage (OCV) for 5-channel serpentine was 6% lower than those two designs. Finally, it was demonstrated that the maximum power of the fuel cell stack were 146 mW, 139 mW, 132 mW for 3-channel serpentine, 5-channel serpentine, and modifi cation parallel-serpentine, respectively.

Formation and Oxidation Behaviour of Superalloy TMS-82+ Coated With a ?-Phase Re-based Alloy Diffusion Barrier Coatings Thosin, Kemas; Lang, Fengqun; Narita, Toshio
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i2.180

A novel coating with duplex Re(W)-Cr-Ni and Ni(Cr)Al layers was formed on a nickel-base single-crystal superalloy TMS-82+, by electroplating Re(Ni), Ni(W) and Ni fi lms, followed by Cr-pack and then Al-pack cementations.A continuous Re-Cr-W-Ni ?-phase diffusion barrier was obtained after Cr-pack cementation. Addition of W to the Re-Cr-Ni ? phase decreased the Cr content, resulting in a ? phase with high melting temperature. The as-prepared Al reservoir layer has a duplex, Ni2Al3 and ?-Ni(Cr)Al layer, and during oxidation at 1423K, the Al reservoir layer changed into a ? phase containing (10-13) at %Al for the 1 hr-Al packed coating and into a mixture of ?- Ni(Cr)3Al and ?- Ni(Cr)Al phases for the 5hr-Al packed coating. A protective ?-Al2O3 scale formed during oxidation at 1423K in air, with the parabolic rate constant 7.410-11kg2m-4s-1 for the 1hr-Al packed coating and 6.610-10kg2m-4s-1 for the 5hr-Al packed coating. There was little diffusion through the ? layer during oxidation at 1423K for up to 100 hrs, without changing micro-structure of the TMS-82+ alloy.

Page 8 of 17 | Total Record : 163

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