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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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SYNTHESIS OF CUMENE (ISOPROPYL BENZENE) FROM ROSIN OIL THROUGH CRACKING AND DEHYDROGENATION Savitri, -; Nasikin, Mohammad; Rinaldi, Nino; Ramdani, Dadi
Teknologi Indonesia Vol 36, No 3 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i3.212

Abstract

Cumene has been synthesized from rosin oil through cracking and dehydrogenation reactions using modified HZSM-5 catalyst. The research has successfully modifi ed the zeolite-based solid acid catalyst by adding Cu-Niand Ni-Mo metal as promoter. Modifi ed HZSM-5 catalysts were characterized using gravimetry and FTIR-pyridine method, and the result showed that the acidity of the catalyst was decreased. Catalyst activity test for cracking anddehydrogenation reactions were carried out to obtain condition of cumene production. The fi nal products were analyzed using GC-MS. Cu-Ni/HZSM-5 catalyst was suitable for the cracking-dehydrogenation reactions of rosinoil to produce cumene with process conditions of 30 bar and 450oC.
Projectile Failure Mechanisms on The Ballistic Multilayer and Ceramic Laminated Composite Panels Satoto, Rahmat
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i2.169

Abstract

Impact on composite structures was a critical topic with great importance in the ballistic materials. Laminated composites have great potential in the design of lightweight armour. This paper presents an experimental study of the ballistic behavior of full metal jacketed projectiles on multilayer kevlar composites and ceramic-laminated kevlar panels. Both kind the ballistic panels were serial shot tested with 9 mm caliber bullet. The projectile velocity was 436 15 m/s and weight of 8.2 g (124 grain). Local as well as global deformations during impact was considered in the evaluation of indentation, penetration, perforation and delamination phases. The delamination was increased with serial number of shots. It was found that a composite panel with areal density of 16.4 kg/m2 and thickness of 10.5 mm comply with level IIIA of NIJ 0101.04 Rev.A. Understanding crack propagation and damage development under high energy impact loads may open new opportunities for the use of these composites in lightweight armour applications.
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.
LACTIC ACID AND HYDROGEN PRODUCTION FROM MICROALGAL BLOOM BIOMASSES Susilaningsih, Dwi -; Harahap, Puspita Sari; Farida, Hilda -; Rahman, Delicia Yunita
Teknologi Indonesia Vol 40, No 1 (2017)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB)

Abstract

Microalgal bloom occurrence is rapidly increasing in a very short time in a specific condition and dominating its habitat. Therefore, blooming often occurs in water ecosystems, from freshwater to brackish and marine. Although there is no officially acknowledged threshold concentration level, the amount of algae cells is estimated reaching hundreds or even thousands cells per mililiter, depending on the species and types. Algae blooming is considered harmful because it gives such a big impact varies on water ecosystems, depending on the species involved, the environment where they are found, and their mechanism metabolism. The hazardous algae poison causes severe effect to various species, such as mammals and other sea creatures, with each presenting specific toxicity in decreasing motor development, immunology, neurological capacity, and reproduction capacity.In this report, the tropical algal bloom biomasses were used for fermentation substrate as substituent of carbon sources in purpose to produce a useful compound of lactic acid. Lactic acid is base material used in forming polylactic acid (PLA) polymerase that is known as basic material for biohydrogen precursor. The lactate bacteria were isolated from local tropical fruit.The result showed all microalgal biomasses converted successfully into lactic acid for 68–92% based on total carbohydrates conversion into lactic acid compounds. Algal bloom biomasses contained mostly of carbohydrate complexes (60–70% of dry weight), protein (10–20% of dry weight), lipid (20–30% of dry weight), and other compounds (5–10% of dry weight). The fermentation result showed that various microalgal blooms biomasses were successfully converted into lactic acid ranging from 58–92% based on total carbohydrates conversion into lactates. Furthermore, the obtained lactic acid was converted into polylactic acid through direct polycondensation process with average result of 60–84% formation unit base on lactic acid weight. Therefore, lactic acid was also successfully converted into hydrogen gas using fermentation process with efficient value from 78–90% unit based on the weight of lactic acid molecules. All these results showed that the unuseful algal biomass could be utilized as a substrate or precursor of fermentation process in term of biodegradable material and energy production, and also lactic acid is an applicable compound in forming polymers and energy.
ANALISIS KINEMATIK DAN DINAMIK MEKANISME PENGGERAK 2-DOF UNTUK ANTENA BERGERAK PADA KOMUNIKASI SATELIT Saputra, Hendri Maja; Rijanto, Estiko
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i1.52

Abstract

Kinematic and dynamic analysis of a mechanism for mobile antennas used in positioning control system of mobile satellite communication (SATCOM) antennas has been conducted. This antenna driving mechanism has two degrees of freedom (2-DOF), they are azimuth and elevation directions. The antenna driving mechanism is put on a vehicle (either land or water), so that the analysis includes vehicle body disturbance in three directions (3-DOF), namely roll, pitch, and yaw. The dynamical model has been made using D-H notation which is common in robotics. Computer simulation has been conducted to analyze the relationship between the antenna movement velocity (azimuth and elevation direction) and the required actuator torque to control the mechanism so that the antenna always keeps pointing to a satellite 630 km above the earth surface. The simulation results show that antenna movement needs smaller actuator torque in smaller elevation and larger actuator torque in larger elevation. For the antenna dimension and the antenna driving mechanism used in this research, it is obtained that nominal value of actuator torque for pan (azimuth) direction is 30 Nm and for tilt (elevation) direction is 200 Nm.
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.
ADSORPTION OF ACID ORANGE-10 DYE ONTO CERIUM DIOXIDE NANOPARTICLES: A KINETIC STUDY Zuas, Oman -; Budiman, Harry; Nuryantini, -
Teknologi Indonesia Vol 38, No 1 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i1.139

Abstract

In this paper, a preserve work on the ability of cerium dioxide nanoparticles (CeO2-NPs) to remove acid orange-10 (AO-10) dye from aqueous solution by adsorption, focusing on the study of the kinetic of AO-10 dye adsorption onto CeO2-NPs surface, was reported. The kinetic data obtained at different concentration of AO-10 dye were analyzed using three different kinetic models, including pseudo-first order, pseudo-second order, and Elovich model. The result showed that the kinetic data fitted with the pseudo-second order kinetic model. Based on the adsorption mechanism data obtained through intraparticle diffusion evaluation, it was found that the adsorption of AO-10 dye onto CeO2-NPs was controlled by the mass transfer rate of the adsorbate molecule from outer to innerof the adsorbent particle. Thus, considering both previous and present studies, it can be suggested that the CeO2-NP appears to be a good adsorbent for the removal of AO-10 dye from aqueous solutions.
SINTESIS SENYAWA ANALOG UK-3A DAN PENGARUHNYA TERHADAP BIOAKTIVITAS IN-VITRO ANTI KANKER LEUKEMIA P-388 Husniati, -; Hanafi, Muhammad
Teknologi Indonesia Vol 33, No 1 (2010)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.048 KB) | DOI: 10.14203/jti.v33i1.15

Abstract

The novel compound of analog UK-3A defi ned as 2-hydroxy-N-octylbenzamide was successfully synthesized by the amidation reaction of aromatic carboxylic acids and primary amine by adding the activator of DCC (N, N-dicyclohexylcarbodiimide), catalyst DMAP (4-dimethyl amino pyridine), and chloroform as a solvent (5 mL). The reaction held in the dean-stark device with continue stirring at 60C for 24 hours. Result shows yield as much as 93%. The structure was identifi ed using UV, FT-IR, 1H-NMR, and 13C-NMR. Bioactivity of the compound was tested in vitro against murine leukemia cancer cells P-388 by using the MTT (3 - (4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide. The result of bioassay showed that this analog compound can inhibit the growth of cancer cell Murine leukemia P-388 with a higher activity than UK-3A indicated by the value of IC50 (inhibitory concentration). IC50 of analog UK-3A was found 7,5 ?g/mL whereas IC50 for UK-3A was 38 ?g/mL.
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.
SIMULATION AND ANALYSIS OF RAYLEIGH BACKSCATTERING EFFECTS IN 105 KM LONG-REACH RSOA-BASED HYBRID WDM/TDM PON TRANSMISSIONS Simatupang, Joni Welman
Teknologi Indonesia Vol 36, No 1 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v36i1.193

Abstract

Passive Optical Networks (PONs)-based hybrid wavelength-division-multiplexing/time-division-multiplexing (WDM/TDM) technologies could be an excellent candidate for being used in the next-generation optical accessnetworks (NGOANs). However, Rayleigh backscattering (RB) effects can cause severe degradation on their performances while utilizing a single-fiber wavelength-reused loop-back confi guration (re-modulation technique) by employing Refl ective Semiconductor Optical Amplifi ers (RSOAs)-based as colorless upstream transmitters at optical network terminals (ONTs) or optical network units (ONUs). In long-reach PONs, optical amplifi cation is an indispensable solution; therefore optical amplifi ers are exactly needed to enhance the power budget and to prevent the fi ber non-linearity problem. As a proof-of-concept, crosstalk-to-signal (C/S) ratio as a function of feeder or distribution fi ber length is briefl y derived using analytical solution method and then simulated using MATLAB commercial software (R2008b) in order to determine the performance of three different architectures (topologies) of 105 km long-reach RSOA-based hybrid WDM/TDM PON transmissions. After the simulation and analysis, the best C/S ratio of -19 dB is obtained for the third topology. This topology even can serve up to 2048 users (subscribers). Users or subscribers could be at home (known as fi ber-to-the-home, FTTH technologies) or in the building(f ber-to-the-building, FTTB technologies).

Page 11 of 17 | Total Record : 163

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