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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 163 Documents
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DESIGN OF GROUND WATER QUALITY AND CAPACITY MONITORING SYSTEM FOR ASR INFILTRATION WELL USING WIRELESS Alam, Hilman Syaeful; Munandar, Aris; Soetraprawata, Demi; Turnip, Arjon
Teknologi Indonesia Vol 36, No 2 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i2.200

Abstract

Design of a monitoring system for the quality and capacity of water absorption wells type Aquifer Storage and Recovery (ASR) using wireless system has been conducted by monitoring changes in well water surface level, the rate of change of fl ow capacity (fl ow rate) and changes in water quality (turbidity). In order to determine the performance of the system, we conducted several tests by placing a sensor and a receiver by two different distances, i.e. the distance of 1 m (short distance) and the actual condition of 35 m (long distance). The results of the system design consist of a wireless monitoring system hardware and data acquisition system software able to display online and in real time. Based on the test results, the value of the total error due to repeatability and linearity for flow rate sensors, water level and turbidity using short-distance wireless systems, are respectively 2.77%, 1.77% and 3.65%. As for the wireless remote system, they are respectively 1.43%, 1.83% and 2.43%. So, the monitoring system of groundwater quality and capacity for infi ltration well using the wireless system can be applied to the actual distance of 35 m, because the error rate due to the infl uence of the distance between the transmitter and the receiver is relatively small, and even better when compared with the short distance ( 1 m).
INVESTIGATION OF Cu, Mn OR Ti ION SUBSTITUTIONS ON THE MICROWAVE ABSORBANCE PROPERTIES OF BARIUM HEXAFERRITE Sebayang, Perdamean; Sari, Ayu Yuswita; Ginting, Masno; Ginting, Riski Titian
Teknologi Indonesia Vol 37, No 3 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v37i3.233

Abstract

The influence of Cu, Mn or Ti ion substitution on the microwave absorbance properties of Barium M-Hexaferrite (BaFe12O19) has been investigated. The sample preparation was held by mixing the raw material of Copper oxide (CuO), Manganese oxide (MnO) or Titanium dioxide (TiO2) with a different composition into BaFe12O19 powder through ball milling process, then sintered at 1100oC for 2 h. The substitution composition for each metal ion (Cu, Mn or Ti) into BaFe12O19 powder was 0.1 and 0.5 % mol. The Vector Network Analyzer (VNA) measurement was used to determine the reflection loss and absorption properties of BaFe12O19 samples within frequency ranging from 410 GHz. The minimum reflection loss 20.3 dB at 4 GHz was achieved, which is related to the 0.1% mol of Ti substitution on BaFe12O19 sample. The reflection loss values could be modified by controlling the metal ions composition which consequently improves the microwave absorption properties. The complex permittivity and permeability were calculated using Nicholson-Ross Weir (NRW) method. The peak of real and imaginary parts of permittivity was consistently appeared at 5.05, 5.92, 6.76, and 7.75 GHz for all metal ions (Cu, Mn and Ti). Furthermore, the complex permeability was found to be independent from frequency and the ion substitution did not significantly influence hexagonal structure and particle size distribution of Barium hexaferrite.
SIMULASI KETERSEDIAAN AIR BULANAN DENGAN BASIS DATA SPASIAL FAKTOR-FAKTOR SUMBER DAYA AIR: KASUS SUB-DAS HULU CITARUM Djuwansah, Muhamad Rahman
Teknologi Indonesia Vol 33, No 1 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i1.12

Abstract

Spatial Monthly Water resources Database of Bandung Basin has been developed to fulfi ll the necessity of more detailed quantitative water resources information. Database development was based on soil water balance using Curve Number (CN) method, distribution of soil permeability tension (pF) and hydraulic conductivity (k) of existing rocks. Input data were monthly isohyet, land use, soils and geologic maps that were processed in GIS software. Isohyet was derived derived from rainfall data and DEM, whereas land use map was derived from satellite LANDSAT/ASTER image. The objective of this paper is to represent simple and appropriate procedure for 1:5000 map scale resolution, in simulating monthly water availability. The outputs of the calculation could be presented as monthly thematic maps of water resources component such as surface water, evapotranspiration, infi ltration and percolation, as well as graphics of tabular data for over all study region or selected area. The estimation results from the data of 2001 and 2004 show the increase of surface run-off and decrease of groundwater availability due to land-use change and rainfall decrease. This database can be use to forecast the future water resources availability caused by land use changes as well as by climatic changes.
PRECIPITATION EVENT ANALYSIS USING IMAGE PROCESSING BASED ON THE RAINFALL DETECTION RADAR (RDR) OBSERVATION ON MARCH 9 2014 DURING LANDSLIDE EVENT IN WEST JAVA Nugroho, Ginaldi Ari; Satyawardhana, Haries; Yulihastin, Erma; Satiadi, Didi; Halimurrahman, Halimurrahman
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.254

Abstract

A Rainfall Detection Radar (RDR) is a simple weather radar based on marine radar that able is to detect the rainfall within 40 km of range located in Bandung. This system is able to conduct continuous operation, with temporal resolution of 3 minutes with data analysis using an image processing method, to analyze the observation data on March 9, 2014 during the landslide event. The landslides are located 24.6 km southwest from the RDR site. According to observation data, there are 2 large rainfall areas distribution that appear near the landslide location. The second rainfall area is estimated to have initiated the landslide. This second area has two detected object. Object A showed first with maximum size of + 6.47 km 2 . From the image processing point of view, the object A contributesto the size area of object B. Object B is the second object detected soon after object A appears. Object B has three peaks of its estimated size area with the highest size of + 19.4 km 2 occuring in 16.14 LT, and will move towards the southeast affected by local wind leaving the landslide location in 16.37 LT. RDR mean rainfall intensity in radius of 1 km from landslide location on 9 March showed the range value from 0.5–2.5 mm/hour that is located in the east side of the landslide location with the duration over 1 hour.
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.
Method of Delineate of the ITCZ for the ITCZ Monitoring System Related to Early Season Yulihastin, Erma; Fathrio, Ibnu; Cholianawati, Nani
Teknologi Indonesia Vol 35, No 3 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i3.190

Abstract

The ITCZ has dominant of role to control atmospheric tropic-equator that were described clearly by satellite band of cloud and rain from west to east around the world as a part of Hadley circulation. Study the ITCZ phenomenon is very important because monsoon onset can be identifi ed by ITCZ jump to the northern or southern relative to the equator. Moreover, understand the ITCZ dynamic is keys to understand other phenomena such as ElNino Southern Oscillation (ENSO), Indian Ocean Dipole Mode (IODM), Madden Julian Oscillation (MJO), monsoon circulation, and Tropical Cyclone (TC). Other phenomena will disturb to the ITCZ. Study the ITCZ also important to predict rain and extreme event related to natural disaster such as fl ood, slide, dryness using prediction model. In this applied research, we develop monitoring system of the ITCZ based on MTSAT satellite observation to define early season over IMC (IMC). Research outputs are early season information and real time of ITCZ position on LAPAN website. The ITCZ position will always updated by real time. The information used to operational concern at LAPAN and researcher at other institutes for investigate early season predict to raise paddy fi eld productivity and to encourage development of early warning natural disaster system. Results show that jumping of the ITCZ positioncan be used to identify early season over IMC by global scale. Whereas in regional scale, jumping of the ITCZ appropriate to insitu observation to detect early season for monsoonal, equatorial, and local rain type. Moreover, time series profi le of the ITCZ has symmetry pattern with zonal wind over southern IMC.
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

Abstract

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.
OPTIMIZATION OF CELLULASE PRODUCTION FROM MARINE BACTERIUM BACILLUS CEREUS C9 BY SUBMERGED FERMENTATION -, Yopi -; Rahmani, Nanik
Teknologi Indonesia Vol 39, No 1 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (0.001 KB) | DOI: 10.14203/jti.v39i1.238

Abstract

Cellulase is one of industrial important enzymes in conversion of lignocellulosic biomass into valuable products such as bioethanol produced by fermentation. Successful bioconversion of cellulosic biomass mainly depends on the nature of cellulose sources of cellulolytic enzyme and optimal conditions for production of enzymes. An extracellular cellulase production by marine bacterium Bacillus cereus C9 was optimized by using submerged fermentation (SMF) on commercial substrate (CMC). The fermentation condition such as substrate concentration, pH medium, temperature fermentation, and carbon source were optimized. The optimum condition found for cellulase production were substrate concentration 2.0% (b/v), pH medium 5, temperature fermentation 30C, and glucose as a carbon source with activity 4.42 U ml-1on 96 hours of fermentation.
KARAKTERISTIK PERPINDAHAN PANAS PADA PENDINGINAN MODEL SUNGKUP REAKTOR AP1000 DENGAN UDARA YANG BERSIRKULASI ALAMIAH Hermawan, Nanang Triagung Edi; Pasek, Ari Darmawan; Umar, Efrizon
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.40

Abstract

Electric energy demand always grows up. Nuclear energy is one of energies alternative in the future. AP1000 is III+ generation reactor that will possibly built in Indonesia. One of the safety AP1000s features is containment cooling system by natural circulation of air. Experimental study on heat transfer characteristic in containment surface of AP1000 model was done in laboratory scale. From these research, it knows that critical heat fl ux happened at power 2010 watt or 553,47 watt per meter square heat fl ux. Empirical correlation from these research is Nux = 7,086. Rax*0,1906; 2,09 x 106 < Rax* < 1,24 x 1012 for cylindrical concentric part and Nux = 1,308. Rax*0,2527; 7,51 x 105 < Rax* < 7,08 x 1010 for ellipse sector.
PENAPISAN BAKTERI ENDOFIT PENDEGRADASI PATI DARI TAMAN NASIONAL GUNUNG HALIMUN (TNGH) Melliawati, Ruth; Sulistiyowati, Eki
Teknologi Indonesia Vol 35, No 1 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v35i1.178

Abstract

In order to produce a good quality biological product such as starch, an enzyme namely amylase was crucially required. Potential microbe could generate sugar through starch degradation. Endophytic bacterias were found on various tissues of plant. Indonesia is really potential to become a source of advantagous endophytic bacteria with its rain forests. The purposes of this research were (1) to screen which endophytic bacteria could degradate starch, (2) to determine the type of reducing sugar generated and (3) to determine the value of amylase activity and theaccumulation of reducing sugar. This research was expected to give some information about the use of endophytic bacteria as an alternative of sugar producer for several industrial sectors. The sceening was practiced to the 30 isolated endophyt bacteria from the plants in Halimun Mountain National Park. Those bacteria was inoculated at a medium named Potato Starch Agar (PSA). The ability to degradate starch could be known when there were clear zones around them. The kinds of sugar were detected by TLC method while the analysis of the amount of reducing sugar and experiment about the activity of amylase were done based on Somogy-Nelson method. The sceening test result that 12 isolates bacteria could grow well on PSA. Three of them generated large clear zones. They wereHL.72 B.153, HL.74 B.156 and HL.89 B.197, with the width of each clear zone were 5,31 cm2, 2,69 cm2 and 6,6 cm2. The experiment of enzymatic activity and the accumulation of of reducing sugar of three choosen isolated bacterias showed that the highest result was HL.89 B.197 with 556,67 Unit and its sugar accumulation value was 631,89 ppm. Then the amylase activitys value of HL.72 B.153 was 505,3 Unit and its sugar accumulation value was 472,29 ppm. The last result was HL.74 B.156 with the amylase activitys value was 263,73 Unit and its sugar accumulation value was 330,21 ppm. The result of TLC showed that a fermentation of HL.72 B.153 was Rf=0,42 of Rf value was same as galactose. HL.74 B.156 Rf value was 0,54 was same as the Rf value of fructose and the Rf value of HL.89 B.197 was 0,54 which was same as the Rf value of glucose.

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