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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 33, No 2 (2010)" : 8 Documents clear
NEURAL NETWORK TRAINING USING SEQUENTIAL EXTENDED KALMAN FILTER FOR RELIABLE ROAD FRICTION COEFFICIENT ESTIMATION Soetraprawata, Demi; Turnip, Arjon
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.26

Abstract

The aim of this study is to estimate the vehicle dynamic parameters concerning with road safety (such as, road tire forces, longitudinal and lateral velocities, angular velocity, rolling radius of wheels, side slip, pitch and roll angle, and road friction coeffi cient which are diffi cult to be measured directly in a standard car) using neural network training on the basis of sequential extended Kalman fi lter (SEKF) and the recursive least squares (RLS). For such estimation, a fourteen degree-of-freedom (DOF) nonlinear full-vehicle dynamics model was developed to provide the simulation requirement. The simulation was performed and compared with CarSim (the interpreter for vehicle dynamics) to verify the model, which confi rms the expected results were all the state variables follow the CarSim response well. The simulation results show that the system performs reliably and fastly in estimating the parameters on different road surfaces during various vehicle manoeuvres.
LIQUID BIOFERTILIZER AND COMPOST FROM ORGANIC MARKET WASTE Sriwuryandari, Lies; Sembiring, Tarzan
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.22

Abstract

Liquid biofertilizer and compost from organic market waste were produce by the addition of some functional microorganisms. Azospirrillium sp., Azotobacter sp., Lactobacillus sp., Pseudomonas sp. and Actinomycetes were inoculated into liquid or solid raw materials. The ripe biofertilizer were characterized and meets the Indonesian National standards for biofertilizer. Actinomycetes contained in the liquid fertilizer about 2.95 x 108 cfu/ml, which is meet the standard (? 104 cfu/ml) and other functional microorganisms namely Lactobacillus sp., Azospirillium sp., Azotobacter sp., Pseudomonas sp. and phosphate diluters were grown enormously with the population of more than 105 cfu/ml respectively. Qualitative test of the fertilizer shown that the fertilizer are effective for the crops such as Long bean (Vigna unguiculata), Cucumber (Cucumis sativus), Leek (Allium ampeloprassum) and others. Production of biofertilizer using organic market waste support the organic farming and the national policy on the fertilizer.
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

Abstract

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.
APLIKASI TEKNIK ENKAPSULASI PADA BENIH SENGON (Paraserianthes falcataria) Priadi, Dody
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.23

Abstract

Seeds were encapsulated using materials containing nutrients in order to survive on a deforested land after spreading by aeroseeding technique. Sengon (Paraserianthes falcataria) seeds from Bogor, Tasikmalaya and Garut were encapsulated using mixture of soil, rice bran, tapioca fl our with compost made from leaf waste and manure (3:1) as a nutrients source. Seeds with a good appearance were tested for the moisture content and stratifi ed prior to germination test on tissue paper and grassy and sandy soil to determine the initial germination. Results of initial seeds germination showed that the highest germination (61.7%) on grassy soil obtained by the seeds from Cianjur, while the lowest (39.0%) obtained by seeds germinated on sandy soil. Seed stratifi cation prior to germination causes the capsule damage and early germination. Encapsulated seeds failed to germinate in germination chamber although the capsules already broken. The highest germination percentage (24.7%) and plant height (3.9 cm) obtained from the encapsulated seeds containing media G (100 g soil + 100 g compost + 100 g tapioca fl our) with the exception for total compound leaves and roots. Seeds encapsulated using rice bran causes microbial contamination of seed capsules so that failed to germinate. This study showed that the tapioca fl our was absolutely necessary as an adhesive agent within encapsulate components with seeds, while the compost can enhance plant growth. Contrary the rice bran causes microbial contamination on seed capsules.
PENGUKURAN TINGKAT EMISI RADIASI ELEKTROMAGNETIK KERETA REL LISTRIK TERHADAP LINGKUNGANNYA Ardiatna, Wuwus; Mandaris, Dwi; Andiani, Dini; Arjadi, R. Harry
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.24

Abstract

The amount of voltage that is used to run Electric Drive Train (Kereta Rel ListrikKRL) system simultaneously resulted on the electromagnetic fi eld radiation (EM). If the level of EM radiation exceeded the threshold of specifi ed standard, it will cause adverse effects to the environment. In this paper, measurements of EM radiation levels emitted by KRL (especially on Serpong-Tanah Abang) have been conducted. System and method of this measurement are based on the standard BS-EN 50121-2:2006. The results showed that the value of EM radiation levels generated by the KRL is below the threshold set by standard. The highest radiation levels occurred at frequency 936 MHz with fi eld strengths of 48.59 dB dB?V/m at horizontal antenna polarization.
GROWTH RESPONSE OF NANNOCHLOROPSIS AT OUTDOOR CULTIVATION IN MEDIUM WITH VARIATION OF NITROGEN CONCENTRATION Astuti, J. Tri; Sriwuryandari, Lies; Yusiasih, Retno; Sembiring, Tarzan
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.048 KB) | DOI: 10.14203/jti.v33i2.20

Abstract

Micro-algae are fast-growing unicellular photosynthetic microorganisms that able to fi x CO2 while capturing solar energy. Source and concentration of nitrogen itself affected to the growth character and composition of microalgae. Cultivation with limited of nitrogen resulted great increase in the lipid content. This study was conducted to investigate the infl uence of nitrogen concentration to the growth rate and lipid characteristics of Nannochloropsis sp. In this study, ammonium nitrate (NH4NO3) was added in different concentration, i.e. 0; 30; 70; and 100% based on nitrogen content in f/2 medium, or equivalent to 0; 1.06; 2.47; and 3.53 (10-4 M). All treatment was prepared triplicate, then cultivated at outdoor batch culture systems and aerated continuously with a sterilized of atmospheric air. The algae biomass was harvested at 14th day after inoculated and then analyzed. Data showed that Nannochloropsis sp. could be cultivated in the outdoor batch system, which temperature was in the range of 26.1137.97oC, with average of 33.44oC. Compared to its initial condition, pH culture increased signifi cantly from 6.92 to 8.54. The highest OD680nm (0.500) and dry cell concentration (458mg.L-1) was obtained by using NH4NO3 at 2.47x10-4 M. The lipid content was 63.58% and 46.59% of dry cell weight when using nitrogen 1.06x 10-4M and 2.47x10-4M, respectively. Composition of fatty acid was not signifi cantly affected by the changing of nitrogen concentration. Palmitic acid (C16:0) was the most of fatty acid in Nannochloropsis sp. (44.4753.97%), followed by lauric acid (25.7834.34%), and myrictic acid (19.0721.19%). The using of N-NH4NO3 at 2.47x10-4M gave the highest lipid content of 213.15mg.L-1.
PEMBUATAN SISTEM MONITORING KUALITAS AIR SECARA REAL TIME DAN APLIKASINYA DALAM PENGELOLAAN TAMBAK UDANG Wiranto, Goib; Hermida, I Dewa Putu
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.25

Abstract

In this paper it will be described the design and construction of a water quality monitoring system that can provide real time information about water quality parameters being measured. The main components of the system include a data logger with GSM based sms gateway, and two sensors for measuring DO and pH parameters. In addition to providing onsite measurement results, the system is also capable of giving the information through a mobile phone in case the DO or pH threshold value has been reached. On the contrary, the measured DO and pH values can also be known anytime via sms from mobile phone to the system. This system has been applied in the monitoring of water quality of shrimp ponds in Banyuwangi, East Java. Apart from providing realtime information, this system can also automatically turn on the turbines in the ponds if the DO value falls under the threshold. As such, the required oxygen supply needed by the shrimp can always be maintained.
PEMBUATAN KERAMIK GERABAH BERBASIS LIMBAH PADAT DARI INDUSTRI PULP DAN TANAH LIAT Sebayang, p.; Ginting, Masno; Henry, -
Teknologi Indonesia Vol 33, No 2 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v33i2.21

Abstract

The earthenware ceramics have been made based on solid waste from pulp industry (sludge) and clay with various composition (in persentage mass). The preparation of raw materials was done using ball mill for 24 hours until it can pass through 100 mesh shieve. Then those raw materials mixed with 50 ml Polivinylalcohol (PVA), and stirred until homogeneous. The sample was formed using dry pressing with pressure of 25 kgf/cm and dried in a drying oven at 60C for 24 hours. The sintering process using electrical furnace with heating rate of 10C/minute, when, the temperature reaching 900C, it is hold for 2 hours. The optimum composition of earthenware cera mics is 50% solid waste from pulp industry (sludge) and 50% clay with sintering temperature of 900C for 2 hours holding time. At this condition, the properties are: bulk density = 1.37 g/cm, crystal density = 2.71 g/cm, porosity = 39.26 %, and compressive strength = 62.90 kgf/cm2. From the XRD analysis it is shown that there are 5 phases such as: silicon oxide (SiO2), calcite (CaCO3), calsium oxide (CaO), magnesium silicate (MgSiO3) and sillimanete (Al2SiO5). The dominant phase is Calcite (CaCO3) while others are minor phases. From SEM measurement it is shown that the particles of the earthenware ceramic has irregular shape, with particle size less than 5 ?m and pore size less than 1 ?m.

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