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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 7 Documents
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Search results for , issue " Vol 39, No 2 (2016)" : 7 Documents clear
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.
IRRIGATION PLANNING FOR ORGANIC VEGETABLE DEVELOPMENT FAMILIA SOLANACEAE BANYUMULEK WNT TECHNO PARK widiyono, wahyu
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v39i2.264

Abstract

Organic vegetable development on chili, eggplant and tomato, Familia Solanaceae is one programme of Banyumulek Techno Park-LIPI, in the West Nusa Tenggara (WNT). The location is in the lowland area with an altitute aroud less than 100 m above sea level, soil texture is sandy loam with rather fast permeability (2.64 cm hour-1 , D3 climate type according to Oldeman Classification with 4-6 wet months and 3-4 dry months. Annual rainfall are varies from 1.553 mm year-1 and 2.779 mm year-1, with average 1.845 mm year-1. Aim of research are (1) to understand surplus and deficit water condition during a year to cultivate chili, eggplant and tomato; and (2) to understand water volume and irrigation time to irrigate crops in order they do not face water deficit. Research methods were conducted through analysis rate of rainfall and evaporation-evapotranspiration during a year, simulation of water deficit, crops water need and irrigation time. The irrigation planning was used as application guide to cultivate above crops in the Banyumulek, demplot.
FLOW RATE OF CARRIER GAS AFFECTING THE KEY PARAMETERS OF GC-TCD FOR CO2, C3H8, AND CO ANALYSIS: AN EXPERIMENTAL INVESTIGATION Zuas, Oman; Budiman, Harry
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.240

Abstract

This paper reports on the effect of flow rate of helium (He) carrier gas on the key parameters of gas chromatography equipped with thermal conductivity detector (GC-TCD) for the measurement of carbon dioxide (CO2 ), propane (C3H8) and carbon monoxide (CO) in gravimetric standard gas mixture (Grav-SGM). The carrier gas has a function to transport vaporized molecules through the column during the GC separation process. The study provides opportunity to experimentally investigate the effect of gas flow rate on the several key parameters of the GC-TCD including retention time, peak area, peak height, response factor, resolution and selectivity. The results show that all key parameters were found to be carrier gas flow rate dependent. The increase of the gas flow rate could significantly decrease the retention time, peak area and response factor of the gas components. While both resolution and selectivity factor were observed to have a substantial decrease with increasing the flow rate of carrier gas. Therefore, proper selection of flow rate level of carrier gas is suggested before a GC measurement is carried out for obtaining an optimum condition.
PRODUCTION OF Nonomuraea sp. ID 06-A0189 INULIN FRUCTOTRANSFERASE AND PREPARATION OF DFA III FROM INULIN USING THE ENZYME Pudjiraharti, Sri
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.266

Abstract

Inulin Fructotransferase (IFTase) converts inulin into difructose anhydride III (DFA III), a functional oligosaccharide. The aim of this study is to find out optimum aeration rate for IFTase production by Nonomuraea sp. ID06-A0189 in 1.5 L fermenter scale. Fermentation was conducted at 30 o C, pH 7.0, 150 rpm and different aeration rates (0.5, 0.75, and 1.0 vvm) for four days. The results showed the higher the aeration rate used, the higher the enzyme activity produced. The highest activity of 9.3 U/mL was produced at 1.0 vvm after 4 days. To find out the ability of inulin fructotransferase to convert inulin into DFA III, the crude enzyme was applied in 50 mL reaction mixture containing 50 and 100 g/L inulin, pH 5.5, 65 o C, for 12 hours. DFA III concentration was measured by high performance liquid chromatography (HPLC). The result indicated the highest DFA III concentration of 56.7 g/L was resulted after twelve hours with the conversion yield of inulin into DFA III was around 57%
EFFECT OF WET MILLING TIME OF Nd-Fe-B FLAKES MATERIALS ON PARTICLE SIZE, MICROSTRUCTURE, AND MAGNETIC PROPERTIES Sardjono, Prijo; Muljadi, Muljadi; Suprapedi, Suprapedi; Djauhari, Nenen Rusnaeni
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v39i2.292

Abstract

The refining of Nd-Fe-B alloy flakes has been done by a wet mechanical milling method using a ball mill. This process is used to produce a fine powder for making permanent magnet materials. The variation of milling time was 16, 24, 48 and 72 hours and a milling medium was used a toluene (pa- Emerck)) to protect the particle from oxidation during the milling process. After milling processes, the samples' distribution particle size were measured by using Particle Size Analyzer (PSA). Microstructure analysis has been conducted by using X-ray diffractometer (XRD) and Scanning Electron Microscope (SEM/EDX) for samples after and before milling. Vibrating Sample Magnetometer (VSM) was used to measure magnetic properties. The characterization results show that the refining process with the wet ball mill obtained finest powder with average size about 1.49 μm for milling time of 48 hours. According to SEM/EDX and XRD analysis, it shows that the crystal structure of the sample before milling was different compared to the sample after milling. It is found new magnetic phase with formula Nd2 Fe14 B. The magnetic properties of sample after milling 48 hrs is higher than that of sample before milling.
HUMAN EXCRETA DISCHARGING SYSTEM AND POTENTIAL NUTRIENT RECOVERY OF ECOLOGICAL SANITATION CONCEPT IS IMPLEMENTED IN SLUM AREA OF KIARACONDONG, BANDUNG Astuti, Jovita Tri; Nilawati, Dewi; Sintawardani, Neni; Ushijima, Ken
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.270

Abstract

This study was aimed to observe sanitation conditions of Kiaracondong and to estimate potential recovery of nutrient from human excreta. Interviews to 111 households covering of defecation frequency, toilet facilities, water sources and discharge systems were conducted through cooperation with the household association. Fresh faeces and urine samples were collected, weighed and characterized. Data of Kiaracondong population was required to calculate the nutrient recovery potential based on human excreta characteristics. The results showed that all public toilets in Kiaracondong, which were installed along the canals, have no water facilities and are in poor sanitation conditions. Wastewater from all public toilets and most private toilets were discharged directly to water bodies. Potential nutrients recovery from human excreta were 57.32, 2.79, 1.57, and 1.65kg.p -1 .y -1 , for OM, N, P, and K respectively. Meanwhile, total nutrient recovery in Kiaracondong was estimated to be 7,199; 350’ 197; and 207 tons.y -1 for OM, N, P, and K respectively. Worm ova was not detected in faeces and urine samples. However, bacteria E. coli and Enterobacter agglomerans and fungus Candida sp. were detected in faeces samples. Meanwhile, organisms in urine were E. coli, Enterobacter aglomerans, Serratia liquefaciens, Serratia marcescens and Staphylococcus saprophyticus. Implementation of composting toilet was expected could be appropriately way to solve the sanitation problems.
THE EFFECT OF ZnO ADDITIVE ON PHYSICAL PROPERTIES AND MICROSTRUCTURE OF BaFe12O19 MAGNETIC MATERIAL Sebayang, Perdamean; Sudiro, Toto; Aryanto, Didik; Nugraha, Endra
Teknologi Indonesia Vol 39, No 2 (2016)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v39i2.265

Abstract

Preparation of BaFe 12 O 19 powder containing varying amount of ZnO as 5, 10, 15 and 20 % by mass were prepared by a high energy milling (HEM) for 1 hour and compacted into a pellet using 80 kgf/cm 2 in compressive pressure. The samples were sintered at elevated temperatures of 800 and 1,000 o C for 2 hours, separately. The characterization results indicated that BaFe 12 O 19 -10 mass % ZnO exhibits excellent in physical and magnetic properties that can be potentially used for recording media and microwave absorbing material applications.

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