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INDONESIA
Teknologi Indonesia
ISSN : 01261533     EISSN : 23031913     DOI : -
Core Subject : Science,
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
PENINGKATAN FLUKS MEMBRAN DENGAN CARA PERENDAMAN DALAM LARUTAN NATRIUM HIPOKHLORIT Ahmad, Syahril
Teknologi Indonesia Vol 32, No 1 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.048 KB) | DOI: 10.14203/jti.v32i1.53

Abstract

Experiment to increase membrane flux by dipping of the membranes into solution of natrium hypochlorite (NaOCl) has been done. The purpose of membranes dipping into solution of natrium hypochlorite is to remove residue of additive that was trapped and remained in membrane pore. Membranes observed were flat membrane made from polysulfone material with dimethylacetamide as a solvent and polyvinyl pyrrolidon (PVP) (MW 10 kDa) as an additive. Membranes were dipped into solution of NaOCl at different concentration they were 3000, 4000, and 5000 ppm with soaking time during 24 hour and as compared membrane was dipped into glycerine 50 %. Flux and rejection of membrane that have been soaked in NaOCl and glycerin 50 % were compared. Results of experiment show that dipping of membrane in NaOCl solution can increase the flux but decrease the coefficient of membrane rejection because of increasing of membrane pore size. The higher the concentrate of NaOCl used for membrane dipping, the greater the flux, but the less the rejection of the membrane.
THE USE OF AN IMPORTED NdFeB MAGNET IN DESIGNING AND FABRICATING AXIAL FlUX PERMANET MAGNET GENERATOR Ginting, Masno; Sebayang, Perdamean; Siregar, Elfrida
Teknologi Indonesia Vol 38, No 1 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v38i1.157

Abstract

Axial flux generator that consists of two rotors and one stator has been engineered. The rotor consists of eightimported NdFeB permanent magnets with 6 x 4 x 0.7 cm dimension and remanant (Br) 1.1 Tesla. The stator with 300 mm diameter consists of a spoils with 80 mm diameter with 400 coils, and the diameter of copper wire is 0.5mm, while the number of the spoil is varied. In this paper, the design and analysis for generator model has been done using 3DS MAX 2014 and Microsoft Visual Basic 2010 Express software, so that the right number of spoils in producing the optimal out put voltage (Erms) is obtained. From the experiment and simulation of axial flux permanent magnet (AFPM) generator, it has been obtained that there is correlation between the rotational speed (Vr in rpm) and the frequency and the voltage (Erms), which are given by equations i.e. frequency = 0.0667 Vr - 0.0001 and Erms = 0.4027 Vr + 3.2619, repectively. Meanwhile, the relation of the rotational speed and the number of spoils (Ns) to the outout voltage (Erms) is given by Erms = 0.0695 Ns Vr.
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.
OPTIMIZATION PRODUCTION OF XYLANASE BY Bacillus pumilus IN EMPTY FRUIT BUNCH USING 3 L BIOREACTOR Wijaya, Hans; Thontowi, Ahmad; Yopi, Yopi
Teknologi Indonesia Vol 40, No 1 (2017)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Indigenous biomasses, such as empty fruit bunch, contain high xylan and are useful to produce raw xylanase, where this biomasses are very abundant in Indonesia. The focus of this research is to scale up the fermentation product into 3 litter feeds and to record the highest enzyme activity. Fermentation process has been done by using stirred fermentor MBI Winpact One Fermentation System. The isolate marine bacterium Bacillus pumilus has been used to degrade empty fruit bunch to produce raw xylanase. The result for different agitation speed showed that at 150 rpm has the highest xylanase activity. The effect of different aeration flows gives at a rate of 4 VVM achieved the highest enzyme activity and equal to 7.61 U/mL with cell growth equal to 2.06. The Sigma Antifoam C has been successfully being used as defoamer in the production fermentor and can be tolerated by Bacillus pumilus. The comparisons of different medium to generate different enzyme by Bacillus pumilus has achieved xylanase, mannanase, and cellulase, where xylanase has the highest enzyme activity among all of the enzymes produced.
FABRICATION AND CHARACTERIZATION OF SOFT COMPOSITE MAGNET BaFe12O19 - SiO2 ginting, masno; Sebayang, Perdamean; N, Nasrudin M
Teknologi Indonesia Vol 38, No 3 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.054 KB) | DOI: 10.14203/jti.v38i3.249

Abstract

Preparation and characterization of soft magnetic BaFe12O19?SiO2 has been successfully carried out by mixing BaFe12O19 powder with SiO2 powder. The ratios of Ba Fe12O19/SiO2 used were 100:0, 80:20, 70:30, 60:40, and 50:50 by percent weight. Mixing process was carried out with a dry milling method using planetary ball mill (PBM) for 48 hours. The mixed powder then was pressed at 35 kgf/cm2 on anisotrophy condition to produce pellets with a diameter of 12 mm and 3?5 mm thicknesses. The pellets then were sintered at temperatures of 600, 650, 700, 750, and 800C, each of which was held for 2 hours. The XRD measurement showed that there were three phases appearing, i.e. BaFe12O19 as the majority, and SiO2 and Fe3O4 as minorities. Meanwhile, the result from SEM measurement showed that the grain size was less than 1 ?m. The best magnetic properties were obtained for the composition of 80 wt% BaFe12O19 and 20 wt% SiO2 with sintering temperature at 800C, where the coercivity value (Hc), remanence (Br) and maximum energy product (BHmax) were 1.656 kOe, 0.81 kG, and 0.414 MGOe, respectively.
Influences of Temperature and Length of Storage on the Viability of Gayam (Inocarpus Edible) Seeds Setyowati, Ninik; Utami, N. W.; Wawo, A. H.
Teknologi Indonesia Vol 37, No 1 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v37i1.213

Abstract

Research of the influences of temperature and length of storage on the viability of gayam (Inocarpus edible) seeds was carried out at Macropropagation Laboratory, Botany Devision, Research Centre for Biology, Cibinong Science Center. The research was using Randomized Block Design with 3 factors and 3 replications, in which each replication had 5 samples. The first factor was length of storage with 4 levels i.e. 0 (before storage), 1, 2 and 4 weeks. The second factor was temperature of storage with 2 levels i.e. 20C and 26C. The third factor was treatment of seeds with 2 levels of unpeeled (TKPS) and peeled (KPS). The result showed that during the storage, moisture content decreased, value of ion leakage increased and gayam seeds viability decreased. The storage at a temperature of 20C was better than 26C, in which the values of ion leakage were 25599.04 and 34662.85 ?Scm-1, with the seed viability of 83.33 and 80.41%, respectively. Meanwhile the viability of unpeeled seed was better then the peeled one, the viability of unpeeled and peeled seeds were 87.08a, and 76.66b %, respectively. Gayam seeds could be stored up to 4 weeks, at 20C unpeeled seed with a high value of viability (86.66ab %). The research on the water sorption of gayam seeds is necessary to determine the appropriate moisture content of gayam seed storage.
KULTUR KOTIL, HIPOKOTIL, DAN EPIKOTIL TANAMAN BUAH NAGA SECARA IN VITRO Sukamto, Lazarus Agus
Teknologi Indonesia Vol 35, No 1 (2012)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v35i1.177

Abstract

Dragon fruit plant is usually propagated by using seed or stem cutting. Plant propagation by using seed take long time because of slow growth, whereas by using stem cutting could damage mother plant and the resulted plant is limited. Experimental in vitro propagation was carried out by using cotyledon, hypocotyl and epicotyl from seeds grown in vitro. Culture media was modified Murashige and Skoog (MS) formulation that macro and micro-nutrients were subtracted half-full and addition of plant growth regulators (PGR) 6-benzylaminopurine (BA) combined with?-naphthaleneacetic acid (NAA) for cotyledon and hypocotyl, thidiazuron (TDZ) for epicotyl. Cotyledon explants produced the best callus production on media with addition of PGR 3 mg/l BA + 2 mg/l NAA and the best root production on media with addition of 0 mg/l BA + 5 mg/l NAA. Hypocotyl explants produced the best callus production on media with addition of PGR 1 mg/l BA + 4 mg/l NAA or 3 mg/l BA + 2 mg/l NAA and the best root production on control media. Epicotyl explants produced the best callus production on media with addition of PGR 1 mg/l TDZ and the best shoot, shoot height and root production on control media. The highest shoot number production on 0,001 0,01 mg/l TDZ treatment. Epicotyl is the best explant compared to cotyledon and hypocotyl, especially on control in vitro propagation of dragon plant, which could save the expenses without using PGR.
WET/DRY CYCLING AND THE EFFECTS OF FIBER LOADING ON THE MECHANICAL PROPERTIES OF CEMENT COMPOSITES MIXED WITH KRAFT PULP-FIBER FROM SENGON (Falcataria Mollucana) WOOD Budiman, Ismail; Fatriasari, Widya
Teknologi Indonesia Vol 40, No 2 (2017)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (27.778 KB) | DOI: 10.14203/jti.v40i2.331

Abstract

Recently, pulp fiber-cement composites have found a practical application in the commercial market to replace hazardous asbestos fibers. For exterior applications, the effects of cyclical wetting and drying on the performance of cement composites were studied. The objective of this study was to investigate the influence of filling wood fibers in cement composites prior to and after a wet/dry cycling treatment. The testing of kraft pulp fiber filling consisted of a 3, 5, and 7% of volume fraction of the composite. The target density and water to cement ratio of the composites produced was 1.5 gcm -3 , with a 0.50 base on weight, respectively. Cement composites were formed and pressed into a mold to the targeted dimensions of 30 cm × 2.5 cm × 2.5 cm (length × width × thickness) for 24hours, before they were removed from the mold. They were then subjected into two curing system conditions. First, the boards were immersed in a water tank at 18 ± 2 °C for 28 days and then tested for their mechanical properties. Secondly, the samples were immersed in the same conditions as before, but followed by a wet/dry curing cycling for 6 times before the mechanical properties were tested. Mechanical characteristics were observed according to ASTM C293-94 for flexural strength and ASTM C116-90 for compressive strength by using a Universal Testing Machine (UTM). The addition of pulp fiber and the wet/dry cycling treatment gave a significantly linear effect on the mechanical properties of composites. The higher amount of wood fiber filling in the cement composites resulted in a lower flexural and compressive strength of the composites. Furthermore, the wet/dry cycling treatment tended to lower the flexural strength, but not the compressive strength of the composites.
PROSES AGLOMERASI DAN DAMPAK OPERASIONAL PADA PEMBAKARAN CANGKANG SAWIT DALAM UNGGUN TERFLUIDISASI Wahyu, Haifa; Affendi, M.
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.39

Abstract

The use of palm shell as fuel in fl uidized bed may be a better choice than that of coal in terms of carbon emission elimination due to its more environmentally friendly properties. But in reality it will cause operational problems. Continuous combustion results in agglomeration of the sand bed, which triggers defl uidization and hence operational shut down. This paper presents a combustion test of palm shell in a laboratory scale fluidized bed furnace with the capacity of 15 kg/hr located at the Research Centre of Physics, Indonesian Institute of Sciences. The results show that continuous burning of palm shell will lead to agglomeration in the furnace, especially when the temperature was above 800oC. The alkali and chlorine material contained in the biomass ash will interact with calcium silicate contained in the sand bed of FBC during combustion. Therefore the mixture of ash and silicate produces clinker that lowers its melting temperature down to about 800C.
BIOTRANSFORMASI 3-SIANOPIRIDIN MENJADI NIKOTINAMIDA DENGAN SEL CORYNEBACTERIUM D5 SEBAGAI BIOKATALIS Sunarko, Bambang; Sulistinah, Nunik
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.048 KB) | DOI: 10.14203/jti.v34iKhusus.46

Abstract

A number of microbes isolated from industrial effl uents were studied to characterise their capability to convert 3-cyanopiridine. Isolate D5, identifi ed as Corynebacterium D5, was able to hydrolise 3-cyanopridin to nicotinamide, nicotinic acid, and ammonia catalyzed by nitrile-hydratase and amidase. The activity of nitrile-hydratase and amidase of Corynebacterium D5 were 0.364 U nad 0.200 U, respectively. The optimum hydrolisis of 3-cyanopiridine were occurred at 25oC and pH 7.0. Corynebacterium D5 exhibited the best growth (0.43 g cells dry weight/liter), when 0.5% (v/v) acetonitrile and 20 mM 3-cyanopiridine were used as sources of carbon, energy, and nitrogen.

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