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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 5 Documents
 1 
Search results for , issue " Vol 36, No 2 (2013)" : 5 Documents clear
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).
DETERMINATION OF RETENTION INDICES OF ISOPROPYL OLEATE, ISOBUTYL OLEATE, AND DIETHYL-HEXYL PHTHALATE BY USING GAS CHROMATOGRAPHY/MASS SPECTROMETRY Pusfitasari, Eka Dian; Andreas, -
Teknologi Indonesia Vol 36, No 2 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v36i2.205

Abstract

Diethyl-hexyl phthalate (DEHP) is the most commonly use of phthalate in plastic packed. There were several cases which subtituted the composition of DEHP in the plastic packed with vegetable oil derivative, such asIsopropyl oleate and Isobutyl oleate from palm oil, because DEHP have negative effect for health. Although it has been substituted with the Isopropyl oleate (IPO) and Isobutyl oleate (IBO), to a certain degree, the DEHP could be evaporated from the foil to its surrounding. Therefore, the analysis of both IPO and IBO is very important to be done. Analysis of IPO, IBO, and DEHP were done using GC equipment with DB-5 column and MS detector. Identifi cation by using Kovats Retention Indices (RI) values is believed to provide optimal results in qualitative analysis, since each compound has a different RI value. Determination of RI value of IPO, IBO and DEHP in various parameters using GC-MS instrument at several ramp temperature conditions of GCs column was done. Meanwhile, the variation of temperature and fl ow rate of carrier gas also became parameter to reach different RT to calculate RI. Determination of the retention indices of IPO, IBO, and DEHP showed that RI laid in the near value range. The RIvalues of those three compounds are 2194, 2317, and 2534, respectively. The different retention time of a certain compounds as a result of a shift or changes of testing parameters will not infl uence the value of its retention indices.
FPGA-BASED DUAL SIMULTANEOUS SIGNAL GENERATOR USING REDUCED MEMORY DIRECT DIGITAL SYNTHESIS Firmansyah, Iman
Teknologi Indonesia Vol 36, No 2 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i2.201

Abstract

This paper describes the implementation of an FPGA (Field Programmable Gate Array)-based signal generator that simultaneously generates dual frequencies. The example demonstrates the capability of generating twodifferent frequencies at the same time. Direct Digital Synthesis or DDS is implemented as the core in generating the signal. To reduce the memory size, the quadrature symmetry of sine wave is created in order to achieve an effi cient look-up table for DDS core. As a result, only one fourth of total look-up table is allocated for storing the data. The system has been developed for Xilinx Spartan-6 XC6SLX9 FPGA integrated with 12-bit Pmod-AD1 analog to digital converter module consisting of AD7476A. The user sets the voltage input connected to Pmod-AD1 module as input control for changing the frequency; each input is dedicated to one channel of frequency. The system is also integrated with 8-bit Pmod-DA1 digital to analog converter module (AD7303) for generating the output signal. The advantage of parallelism capability in FPGA makes it possible to generate two different frequencies (2.18 KHz and 4.35 KHz) simultaneously.
TEXTILE INDUSTRY AWARENESS CONCERNING THE IMPLEMENTATION OF OCCUPATIONAL HEALTH AND SAFETY: A CASE STUDY OF THREE TEXTILE PLANTS IN BANDUNG AREA Sukapto, Paulus; Djojosubroto, Harjoto
Teknologi Indonesia Vol 36, No 2 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i2.202

Abstract

The present study explores awareness concerning the implementations of occupational safety of three textile plants in Bandung area. The study was supported by data from our visit to those respective textile plants, i.e. from discussions with the managers and employees, the observations towards the working conditions and the activities of the employees, and the response of questionnaires asked to the operators. It was found that the occupational safety procedures have to be improved. The lighting levels in most departments of these plants shall be higher than the present lighting level. The noise levels in two of the three plants have to be lowered. Out of the questionnaire it was learned that the adverse effects of the poor workplace conditions were experienced by the employees. The safety organization of these plants was not integrated to the organizational structure of the respective company. Among those three textile plants, only one plant provided data on accidents in 2011 and 2012. It seems that the number and the severity of the accidents were not signifi cantly different. In 2012 there was an accident that led to permanent disability. The awareness and the concern of the managers to the occupational safety were poor. That is why it is proposed that the occupational safety solutions of these plants have to be performed by safety management approach based on macro-ergonomics principles.
DIVERSITY OF PLANTS NATURALLY GROW IN TROPICAL DRY FOREST (T-df) OF BUKIT JIMBARAN BALI Sujarwo, Wawan; Arinasa, Ida Bagus Ketut
Teknologi Indonesia Vol 36, No 2 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i2.203

Abstract

Bukit Jimbaran Bali is considered one of the dry areas on Bali Island. The climate is very dry during the year and has very limited rainfall in the rainy season. The aim of our study is to review the ecology of natural regeneration of T-df, focusing on how the available information can be used to facilitate the recovery of these forests in disturbed areas. Tropical dry forest around Udayana University, which is situated in Bukit Jimbaran Bali, was selected as the investigation area since there was an ongoing CSR (corporate social responsibility) project for establishing urban forest at Udayana University. Sampling plots were established to determine plant diversity of seedlings, saplings, poles, and trees. Research results revealed high diversity of seedlings (40 species) and saplings (35 species) while trees were limited (11 species). We have come to the conclusion that groundcover diversity is high enough (75 species) even though the soil depth is very thin. In addition, there was abundant Acacia auriculiformis which is considered as an invasive species in the area.

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