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INDONESIA
Teknologi Indonesia
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 8 Documents
 1 
Search results for , issue " Vol 32, No 1 (2009)" : 8 Documents clear
PENGARUH HARMONIK TERHADAP TEGANGAN KELUARAN PROTOTIP GENERATOR MAGNET PERMANEN KECEPATAN RENDAH Irasari, Pudji; Fitriana, -
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.49

Abstract

This paper discusses harmonic content in the generator prototype of 1035W, 220V, 3 phase, 333 rpm with the shifting of permanent magnet segment of 15,7 mm. Magnetomotive Force (MMF) caused by stator current is analyzed using Fourier series to obtain harmonics in load condition. Only induction voltage generated by permanent magnet that is taken into consideration of no-load harmonics. Harmonic spectrums are presented in the form of Total Harmonic Distortion (THD) versus. harmonic number. The influence of the highest THD spectrum to the waveform of output phase voltage is analyzed. Theoritical analyses and experimental measurement results of harmonic spectrums and output phase voltage waveform show the similar pattern. The difference of the output phase voltage peak is estimated due to the exceedingly low value of parameter Bm.
IMPROVEMENT OF SOY SAUCE INOCULUM QUALITY USING A MIXED CULTURE OF ASPERGILLUS ORYZAE TG1 AND MICROCOCCUS LUTEUS Pudjiraharti, S.
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.54

Abstract

The aim of this research is to improve the quality of soy sauce inoculum by increasing the activity of enzymes containing in inoculum which is needed for the degradation of soybean nutrition compounds. A mixed culture of Aspergillus oryzae TG1 and Micrococcus luteus with various ratio of colony number were used for inoculum preparation.The ratio of A.oryzae TG1 to M. luteus were 1:0, 1:0.25, 1: 0.50, 1:0.66, and 1:1. Incubation was done at 30 oC for four days. Inoculum with the highest enzyme activity was applied for koji preparation. The result of experiment showed that a mixed culture with ratio 1:0.25 indicated a positive effect on inoculum quality by resulting the highest activity of all enzymes tested. The Activity of ?-amylase enzym was 2055.1 Units/g, protease was 17.1 Units/g, and ?-glucosidase was 18.3 Units/g. They were observed at four days incubation. Total plate count analysis of this inoculums resulted 1.14 x 1011 cfu of A. oryzae and 2.05 x 109 cfu of M. luteus per g inoculum which were higher than that of starter. Application of the inoculums with ratio of 1:0.25 for koji preparation showed the increase of all enzymes activities in koji compared to the control inoculum (1:0).
BALLISTIC IMPACT BEHAVIOR OF WOVEN FABRICS POLYMER COMPOSITES WITH DIFFERENT STRUCTURES AND CONFIGURATIONS Satoto, Rahmat; Nugroho, Pramono; Santosa, Tata
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.50

Abstract

This study reports the ballistic penetration performance of a composite materials composed of woven Kevlar fabric, woven nylon fabric, woven ramie fabrics impregnated with compatible resins and hybrid composite construction of these three structures. The composite panels were tested by low velocity bullet (around 322 m/s) in incident angle of 0o according to level I NIJ 0101.04. The effects of fabric configuration, composite structure, and the resin compatibility on ballistic performance were investigated. Composites with Kevlar-A363F fabric performed the best among these composites. Composite of 4 layers kevlar-A363F shows the better performance than 32 layer composites of nylon- oxford X7 and 48 layers ramie fabrics. Ballistic penetration mechanism of the fabric-reinforced composites demonstrated that breakage, matrix cracking, and delamination are three typical mechanisms of failure and energy absorption. In the kevlar-A363F composites, ballistic impact causes the blunting of a projectile. This projectile deformation is seen as an effective mechanism of energy absorption. Kinetic energy of a blunt projectile will be absorbed by wider cross section of the next fabric layer, so the projectile velocity slows down until it stops. The enhancement of ballistic performance is shown to be associated with the fiber strength, construction, fabric configuration, and matrix compatibility. It is likely that the best design of bullet proof composite can be identified.
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

Abstract

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.
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

Abstract

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.
INFLUENCE OF NI++ AND FE++ ON THE ANAEROBIC BIODEGRADATION OF ORGANIC WASTE SUSPENSION Sriwuryandari, Lies; Sembiring, T.
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.048 KB) | DOI: 10.14203/jti.v32i1.56

Abstract

Study of the effect of trace elements of Ni and Fe and acidity on the biodegradation of organic material in anaerobic condition was executed in serum vials. Effect of ferrous, nickel, its combination and acidity were determined by the measurement of volatile fatty acids, methane, hydrogen, and organic materials concentration during the experiment. The influence of nickel and ferrous on the biodegradation of organic materials shows that ferrous was more favorable although nickel is an essential element for methanogens. Iron stimulated gas production more quickly than nickel did in anaerobic digestion even for organic material elimination was better in the presence of iron rather than nickel. Effect of acidity on the biodegradation shown that pH should be above 6.5 to have an optimum degradation of organic substances.
ANALISIS KINEMATIK DAN DINAMIK MEKANISME PENGGERAK 2-DOF UNTUK ANTENA BERGERAK PADA KOMUNIKASI SATELIT Saputra, Hendri Maja; Rijanto, Estiko
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.52

Abstract

Kinematic and dynamic analysis of a mechanism for mobile antennas used in positioning control system of mobile satellite communication (SATCOM) antennas has been conducted. This antenna driving mechanism has two degrees of freedom (2-DOF), they are azimuth and elevation directions. The antenna driving mechanism is put on a vehicle (either land or water), so that the analysis includes vehicle body disturbance in three directions (3-DOF), namely roll, pitch, and yaw. The dynamical model has been made using D-H notation which is common in robotics. Computer simulation has been conducted to analyze the relationship between the antenna movement velocity (azimuth and elevation direction) and the required actuator torque to control the mechanism so that the antenna always keeps pointing to a satellite 630 km above the earth surface. The simulation results show that antenna movement needs smaller actuator torque in smaller elevation and larger actuator torque in larger elevation. For the antenna dimension and the antenna driving mechanism used in this research, it is obtained that nominal value of actuator torque for pan (azimuth) direction is 30 Nm and for tilt (elevation) direction is 200 Nm.
PENINGKATAN FLUKS MEMBRAN DENGAN CARA PERENDAMAN DALAM LARUTAN NATRIUM HIPOKHLORIT Ahmad, Syahril
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.048 KB) | DOI: 10.14203/jti.v32i1.53

Abstract

Experiment to increase membrane flux by dipping of the membranes into solution of natrium hypochlorite (NaOCl) has been done. The purpose of membranes dipping into solution of natrium hypochlorite is to remove residue of additive that was trapped and remained in membrane pore. Membranes observed were flat membrane made from polysulfone material with dimethylacetamide as a solvent and polyvinyl pyrrolidon (PVP) (MW 10 kDa) as an additive. Membranes were dipped into solution of NaOCl at different concentration they were 3000, 4000, and 5000 ppm with soaking time during 24 hour and as compared membrane was dipped into glycerine 50 %. Flux and rejection of membrane that have been soaked in NaOCl and glycerin 50 % were compared. Results of experiment show that dipping of membrane in NaOCl solution can increase the flux but decrease the coefficient of membrane rejection because of increasing of membrane pore size. The higher the concentrate of NaOCl used for membrane dipping, the greater the flux, but the less the rejection of the membrane.

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