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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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CHARACTERIZATION AND PROSPECTIVE PROCESS OF MANGANESE ORE OF TANGGAMUS AND WAY KANAN REGENCY LAMPUNG PROVINCE Mufakhir, Fika Rofiek; Sumardi, Slamet
Teknologi Indonesia Vol 37, No 1 (2014)
Publisher : LIPI Press

Manganese (Mn) has a very important role in various industrial fields such as iron, steel, food, agriculture and chemical industry. High grade Mn ore(>40%) are generally processed through the pyrometallurgy process, whereas for low grade Mn ore (<40%) is processed through the hydrometallurgical treatment process. This study aims to characterize the Mnore in Tanggamus and Way Kanan Regency Lampung Province and prospective process. Experiment begins with a sampling of the area in Tanggamus and Way Kanan mine. Sample preparation is then performed by reducing the particle size of the ore through the stages of crushing, grinding and particle size distribution. Mn ore sample which has been reduced then performed characterization using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). The results showed that the characteristics of Mn ore in Tanggamus and Way Kanan mine was different. Mn ore Tanggamus have the highest contentof 33.84% Mn associated with Fe2O3 minerals, while Mn ore Way Kanan had content 18.03% associated with SiO2 minerals. Both Mn ore are included in low grade Mn ore (<40). Prospective processing of manganese ore is initiated by benefitiation and proceed by leaching method.

THE EFFECT OF DIGITAL PWM STEADY STATE RESPONSE ON THE SPEED OF BLDC MOTOR Rahmayanti, Rifa; Utomo, Sapdo; Saputra, Hendri Maja
Teknologi Indonesia Vol 38, No 3 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i3.244

This research aims to analyze the work system of a brushless DC (BLDC) motor speed driver. The motor is controlled by a driver which receives speed command signal from a microcontroller. Effect of digital Pulse Width Modulation (PWM) command signal on the speed response of the motor is investigated by changing duty ratio from 30% to 100% and frequency between 500Hz?100kHz. Each speed response is compared against the speed response of the corresponding analog command signal. From the experimental results, it can be concluded that larger switching frequency provides smaller steady state error and smaller standard deviation in the speed response. More specifically, for the BLDC motor used in the experiments, steady state error of 5% rotational speed can be achieved only by a digital PWM command signal the duty cycle ratio of which is larger than 60% and the frequency of which is larger than 1 kHz.

PROFIL ASAM AMINO EKSTRAK CACING TANAH (LUMBRICUS RUBELLUS) TERENKAPSULASI DENGAN METODE SPRAY DRYING Hayati, Septi Nur; Herdian, Hendra; Damayanti, Ema; Istiqomah, Lusty; Julendra, Hardi
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Antibiotics in poultry were widely used as growth promotor and anti-infective. When antibiotics were used continuously for long periods, it caused microbial resistance. Various attempts were made to replace antibiotics along with the increasing of trend towards demand for healthy, safe and free from harmful residues of livestock products. One of them was application of earthworm which contains high protein and complete amino acids. Earthworms were extracted into water extract form by decoct method. Water extract form had some weaknesses. It was necessary to formulate into a solid dosage form which was more stable, reproducible, and practical. The selected formulation was encapsulation by spray drying method. Quality control of feed additives can be seen from biological value. Biological value correlated positively with amino acids equilibrium or Essential Amino Acid Index (EAAI). The result showed that earthworm extract had both essential and non-essential amino acids higher than earthworm meal and encapsulated earthworm extract. The highest essential amino acid in earthworm meal was isoleucine (3.14%), in earthworm extract was lysine (8.16%), and in encapsulated earthworm extract was leucine (1.71%). The highest non-essential amino acids in earthworm meal and encapsulation of earthworm extract were glutamic acid, respectively 7.67% and 1.87%, while the earthworm extracts was serine (14.52%). The high value of IAAE in earthworm extract showed that the extraction method resulted better amino acid balance (69.87%) than earthworm meal (58.67%). While the value IAAE of encapsulated earthworm extract showed that levels of essential amino acid balance was lower (16.05%) than the earthworm meal (69.87%) and the earthworm extract (58.67%).

COMPARATIVE STUDY OF MAMDANI AND 1 ST -ORDER TAKAGI SUGENO KANG TYPE FUZZY LOGIC CONTROLLERS FOR CONTROLLING THE RIGID GANTRY CRANE SYSTEM Yazid, Edwar; Rahmayanti, Rifa
Teknologi Indonesia Vol 40, No 2 (2017)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v40i2.422

Controlling the rigid gantry crane system is challenging due to it being an under-actuated system. This paper addresses the challenge by presenting the fuzzy logic controller (FLC) with Mamdani and the 1 st -order Takagi Sugeno Kang (TSK) types presenting it in this comparative study. Both controllers are proposed to control the position of the crane while suppressing the swing of the payload. Simulation results show that the Mamdani type outperforms the 1 st -order Takagi Sugeno Kang (TSK) type in terms of no overshoot, though the earlier controller (Mamdani) has a slower rise time, settling time and peak time than the latter controller (TSK).

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

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.

POWER CURVE PREDICTION OF SMALL SCALE WIND TURBINE REFERRING TO THE GENERATOR CHARACTERISTIC Irasari, Pudji; Candra, Dodiek Ika
Teknologi Indonesia Vol 36, No 3 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i3.207

This paper discusses power curve prediction of small scale wind turbine for a battery charger. The proposed prediction method does not require the data of wind speed but refers to the generator characteristic instead. The method is based on wind turbine power equation initiated with determining the value of Cp, then establishes the powerwind speed and shaft speedwind speed correlations. For simplicity, this method ignores aerodynamic factor of the system. The simulation result in the form of wind turbine power curve (power versus wind speed graph) is then compared with the characteristics of commercial wind turbine and demonstrates rational values of cut-in and cut-out wind speed.

EFFECT OF DEXTRIN AND LACTOSE IN PREPARATION OF POWDERS DOSAGE FORM FROM Centella asiatica EXTRACT Saraswaty, Vienna; Risdian, Chandra; Mozef, Tjandrawati; S. Kardono, Leonardus Broto
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Objective of this research is to investigate the influence of dextrin and lactose in preparation of dosage form from Centella asiatica (CA) ethanol extract. Powders dosage form of CA ethanol extract was prepared by kneading method. Previously, it had been known that to create CA extract concentrate long time is needed, i.e. more than 7 days. Drying preparation of CA extract by thin layer film in oven blower at 50oC gave a shorter drying time, i.e. 6 hours but it gave sticky form at the end of process. Preparation process to produce powders dosage by using dextrin and lactose was succesfully investigated in our laboratory. It resulted that dextrin was appropriate filler for preparation of CA extract powder. Powder dosage form of CA extract could be obtained after 6 hours of drying and using 30% w/w of dextrin (based on the weigh of wet extract at density of 1,000 gr.mL-1). Difference on amount of dextrin in CA extract gave influence on water content, acidity (pH), compressibility index, haussner ratio, flow propert,y and angle of repose significantly.

DESAIN ARSITEKTUR KNOWLEDGE MANAGEMENT SYSTEM LAYANAN JASA KALIBRASI DI UPT BPI LIPI DENGAN MENGGUNAKAN SOFT SYSTEM METHODOLOGY Fakhrurroja, Hanif
Teknologi Indonesia Vol 33, No 1 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i1.19

The age range of UPT BPI LIPI employees is relatively unbalanced. 71,42% of the employees have already exceeded 40 years old and 58,73% of them will be retired in 2015. Based on these facts, UPT BPI LIPI needs a Knowledge Management System (KMS) that can store knowledge assets of the employees. Soft Systems Methodology (SSM) is used as a method to identify the knowledge and to develop the best architecture design of KMS for UPT BPI LIPI. There are fi ve stages in the knowledge management cycle for calibration services in UPT BPI LIPI, namely knowledge acquisition, knowledge extraction, knowledge storage, knowledge sharing, and knowledge update. The result of SSM showed that KMS design can be applied to create knowledge, to share knowledge, to record knowledge, to store knowledge, and to reuse knowledge, so it can be optimize the calibration services in UPT BPI LIPI.

EXPRESSION OF THE FLUORESCENT PROTEIN MTURQUOISE2 IN THE PERIPLASM OF Escherichia coli Handayani, Ira; Kusharyoto, Wien
Teknologi Indonesia Vol 39, No 3 (2016)
Publisher : LIPI Press

Many variants of cyan fluorescent protein (CFP) have been developed as fluorescent tags which are widely used as donors in Förster resonance energy transfer (FRET) experiments. Recent improvement of CFP variants resulted in mTurquoise2, a brighter variant with faster maturation, high photostability, longer mono-exponential lifetime and the highest quantum yield measured for a monomeric fluorescent protein. Here, the authors describe the expression of mTurquoise2 targeted for secretion via the general secretory (Sec) translocation pathway into the highly oxidizing periplasm of Escherichia coli. The use of signal peptide MPB*1, a modified signal sequence of maltose binding protein was investigated. The His6-tagged fluorescent protein was expressed in E. coli NiCo21(DE3) and purified by means of immobilized metal ion affinity chromatography (IMAC) on TALON™ matrix. In SDSPAGE and Western blot analysis, a single band corresponding to a molecular mass of approximately 28 kDa was observed, which correlated with the predicted molecular mass based on the amino acid sequence of mTurquoise2.

WEB BASED AIR POLLUTION INSTRUMENTATION MONITORING SYSTEM Ari, Ginaldi; Awaludin, Asif; Suherman, Heri; Latief, Chunaeni; Sinatra, Tiin; Sofiati, Iis
Teknologi Indonesia Vol 36, No 1 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i1.197

Air pollution dispersion is not only affected by emission source but also by meteorological factor that is involved. Local meteorological factor will change the air pollution dispersion pattern both in urban area and inanother region. Concavity and valley topographic condition in Bandung city will enable temperature inversion and bring about air fl ow back circulation, causing CO pollutant accumulation. CO is one of the primary pollutants that emits directly from the emission source. It is colorless and odorless gas, posseses longer lifetime which is 30-90 days in the troposphere, and also reduces bodys capability of oxygen absorbance, forming carboxy haemoglobin when being inhaled by human. CO concentration monitoring has been conducted by building and designing CO measurement system equipped with temperature and oxygen monitoring. This integration system consists of sensors (over CO, temperature and oxygen), GPRS modem interface module, sensor interface module, webserver and compilation data system completed with graphical visualization of the CO concentration and surface temperature data every 15 minutes. Analysis on CO concentration trend and observation on surface temperature will become references for the research on local meteorological infl uence toward CO ambient concentration.

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