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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 16 Documents
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Search results for , issue " Vol 34 (2011)" : 16 Documents clear
KARAKTERISTIK PERPINDAHAN PANAS PADA PENDINGINAN MODEL SUNGKUP REAKTOR AP1000 DENGAN UDARA YANG BERSIRKULASI ALAMIAH Hermawan, Nanang Triagung Edi; Pasek, Ari Darmawan; Umar, Efrizon
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.40

Abstract

Electric energy demand always grows up. Nuclear energy is one of energies alternative in the future. AP1000 is III+ generation reactor that will possibly built in Indonesia. One of the safety AP1000s features is containment cooling system by natural circulation of air. Experimental study on heat transfer characteristic in containment surface of AP1000 model was done in laboratory scale. From these research, it knows that critical heat fl ux happened at power 2010 watt or 553,47 watt per meter square heat fl ux. Empirical correlation from these research is Nux = 7,086. Rax*0,1906; 2,09 x 106 < Rax* < 1,24 x 1012 for cylindrical concentric part and Nux = 1,308. Rax*0,2527; 7,51 x 105 < Rax* < 7,08 x 1010 for ellipse sector.
PENENTUAN INDEKS MONSUN INDONESIA BERDASARKAN ANGIN ZONAL Yulihastin, Erma
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.45

Abstract

The research defi ned monsoon index which represented Indonesia Maritime Continent. Indonesia monsoon index were calculated based on monthly mean zonal wind at 850 milibar over the north-east area (2-80N, 95-1180E) and south (2-100LS, 105-1500BT), mentioned as Index I and Index II, respectively. The choice of index area based on prevailing westerly(easterly) to easterly(westerly) wind in the annual cycle. Monthly mean wind data derived from NOAA Satellite (National Oceanic and Atmospheric Administration), NCEP/NCAR Reanalysis (National Center for Environmental Prediction/National Center for Atmospheric Research), which have 2.5 degree spatial resolution from 1948 to 2010. The results showed Index I and II have symmetry pattern. Maximum (> 5 m/s) of Index I occurred on August and minimum (<-4 m/s) occurred on January. Conversely, Index II reached maximum (> 5m/s) at February and the minimum (<-5 m/s) occurred on August. The Index I and AUSMI (Australia Monsoon Index) were symmetry, but have different in amplitude. Correlation between the Index I and AUSMI were 0.99. The Index II and Webster-Yang Index were symmetry but have different in phase and amplitude. Correlation between the Index II and Webster-Yang Monsoon Index were also 0.99. Correlation between index I(II) and precipitable water were 0.68(0.95), respectively.
DELIGNIFIKASI AMPAS TEBU DENGAN LARUTAN NATRIUM HIDROKSIDA SEBELUM PROSES SAKARAIFIKASI SECARA ENZIMATIS MENGGUNAKAN ENZIM SELULASE KASAR DARI ASPERGILLUS NIGER FNU 6018 Gunam, Ida Bagus Wayan; Wartini, Ni Made; Dewi Anggreni, Anak Agung Made; Suparyana, Pande Made
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.36

Abstract

Cellulose, the most abundant renewable resource, has received much attention as potential energy and carbon source for the production of useful products such as glucose, ethanol and fuels. The possibility of converting cellulose in bagasse enzymatically into glucose, after being loosened its complex structure chemically into primary one by using sodium hydroxide was studied. Bagasse was soaked in 6% sodium hydroxide for 12 hours at room temperature. This treatment resulted in loosening some cellulose bundle structure shown by release of lignin and hemicelluloses up to 32.11 and 42.87%, respectively and high water retention value of 15.90 (w/w). In this condition the delignifi ed bagasse could be saccharifi ed by crude cellulase enzym from Aspergillus niger. Saccharifi cation enzimatically of 2 g delignifi ed bagasse at 50oC pH 4,8 during 120 hours produced reducing sugar of 54.47 mg/100 ml.
ANALISIS HASIL UJI TERAP ALAT PENGHEMAT BBM ELECTRIC FUEL TREATMENT PADA ENGINE DIESEL GENSET 35 KVA DENGAN BEBAN STATIS Hariyadi, -; Sugiono, -; Fakhrurroja, Hanif; Tanu, Edy
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.41

Abstract

This paper describe fi eld test results analysis for fuel saving tool called Electic Fuel Treatment (EFT) on diesel engine generator set 35 KVA with static load. Field test on diesel engine generator set was performed with a variety of confi gurations EFT in series or parallel to get the best fuel effi ciency. Methods of analysis done bythe operational technical tests by comparing the results of testing before and after installation of EFT. Field test results are a form of EFT confi gurations that is ideal to obtain fuel effi ciency on average of 6.58% at 60% load and exhaust emission reduction levels between 20%24%.
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.
PRETREATMENT TRAMETES VERSICOLOR DAN PLEUROTUS OSTREATUS PADA BAGAS UNTUK PRODUKSI BIOETANOL Anita, Sita Heris; Fajriutami, Triyani; Fitria, -; Ermawar, Riksfardini Annisa; Yuli Yanto, Dede Heri; Hermiati, Euis
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.37

Abstract

Single and mix cultures of white-rot fungi Trametes versicolor and Pleurotus ostreatus has been applied onto sugarcane bagasse as a pretreatment process. The purpose of this research was to investigate the effect of single and mix cultures of white-rot fungi in lignin degradation while maintaining minimum loss of ?-cellulose of sugarcane bagasse. Single and mix cultures of white-rot fungi T. versicolor and P. ostreatus have been inoculated onto sugarcane bagasse which varied in 5%, 10%, and 15% (w/v) with inoculum comparison 1:1. After 4-week incubation, analysis was carried out on the content of extractives, lignin, ?-cellulose and hemicellulose. The result showed that 4-week incubation of single culture of P. ostreatus was more advantageous as a pretreatment method for sugarcane bagasse, with considerable number of lignin degradation (17,95%) and minimum loss of cellulose (11,00%) and hemicelluloses (5,75%). As with mix cultures, incubation period should have been reduced to prevent significant loss of cellulose and hemicellulose. Furthermore, with shorter incubation period, this biological pretreatment process will be more interesting and feasible for the industry.
STUDI DESAIN ALUR GAS PADA ANODA PLAT BIPOLAR DAN PENGARUHNYA TERHADAP PERFORMA PEMFC BERDASARKAN HASIL EKSPERIMEN Indriyati, -; Pujiastuti, Sri; Lazuardi, -; Isya, Nini
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.42

Abstract

The effect of the anode fl ow fi eld design on the performance of Proton Exchange Membrane Fuel Cell (PEMFC) with an active area 9 cm2 was investigated experimentally. 3-channel serpentine, 5-channel serpentine and modifi - cation of serpentine-parallel fl ow fi elds has similar channel cross section, 1.35 mm for channel width, 0.55 mm for channel depth, and 0.7 mm for the land between channels. They were tested with hydrogen fl ow rate of 50 ml/min, oxygen flow rate of 250 ml/min, pressure 1.5 Bar, and dew point temperature 80C at 100% relative humidity. The experimental results obtained from measurement of current (I) and potential (V) indicated that 3-channel serpentine exhibited higher performance than others even though it was not so significant. At current density of 20 mA/cm2, modification serpentine-parallel design showed signifi cant potential drop, probably due to turbulence gas flow inside the channel. Open circuit voltage (OCV) for 5-channel serpentine was 6% lower than those two designs. Finally, it was demonstrated that the maximum power of the fuel cell stack were 146 mW, 139 mW, 132 mW for 3-channel serpentine, 5-channel serpentine, and modifi cation parallel-serpentine, respectively.
PROFIL ASAM AMINO EKSTRAK CACING TANAH (LUMBRICUS RUBELLUS) TERENKAPSULASI DENGAN METODE SPRAY DRYING Hayati, Septi Nur; Herdian, Hendra; Damayanti, Ema; Istiqomah, Lusty; Julendra, Hardi
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.33

Abstract

Antibiotics in poultry were widely used as growth promotor and anti-infective. When antibiotics were used continuously for long periods, it caused microbial resistance. Various attempts were made to replace antibiotics along with the increasing of trend towards demand for healthy, safe and free from harmful residues of livestock products. One of them was application of earthworm which contains high protein and complete amino acids. Earthworms were extracted into water extract form by decoct method. Water extract form had some weaknesses. It was necessary to formulate into a solid dosage form which was more stable, reproducible, and practical. The selected formulation was encapsulation by spray drying method. Quality control of feed additives can be seen from biological value. Biological value correlated positively with amino acids equilibrium or Essential Amino Acid Index (EAAI). The result showed that earthworm extract had both essential and non-essential amino acids higher than earthworm meal and encapsulated earthworm extract. The highest essential amino acid in earthworm meal was isoleucine (3.14%), in earthworm extract was lysine (8.16%), and in encapsulated earthworm extract was leucine (1.71%). The highest non-essential amino acids in earthworm meal and encapsulation of earthworm extract were glutamic acid, respectively 7.67% and 1.87%, while the earthworm extracts was serine (14.52%). The high value of IAAE in earthworm extract showed that the extraction method resulted better amino acid balance (69.87%) than earthworm meal (58.67%). While the value IAAE of encapsulated earthworm extract showed that levels of essential amino acid balance was lower (16.05%) than the earthworm meal (69.87%) and the earthworm extract (58.67%).
SCREENING OF NITRILE-DEGARADING ENDOPHYTIC BACTERIA FROM THE BIODIVERSITY OF INDONESIA Atmosukarto, Ines I. C.; Sunarko, Bambang
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.47

Abstract

Nitriles are an important group of compounds which appear in the environment via natural or industrial synthesis. Nitrile-metabolising microorganisms usually convert nitriles via one of the following two hydrolytic pathways: 1) conversion of the nitrile directly to its corresponding carboxylic acid and ammonia by nitrilase, and/or 2) conversion of the nitrile by nitrile hydratase to an intermediate amide, which is then converted by an amidase to the corresponding carboxylic acid and ammonia. The potential biotechnological application of these enzymes to produce amides and/or acids from nitriles has a major industrial interest. Higher plants are host to microorganisms, generally referred to as endophytic microbes (or endophytes) which colonise the internal tissue of living plants without causing overt negative effects to their host. Rare and biologically active compounds have been isolated from these microbes ranging from anti-infective activity, antioxidant, anticancer, insecticidal and others. Some of the compounds that have been discovered in endophytic microbes include taxol, cryptocin, cryptocandin, and ambuic acid amongst a few. However, the potential of this relatively untapped source of microbial diversity as a source of nitrile converting enzymes has yet to be evaluated. In this study we have tested approximately 850 bacterial endophytes for their ability to utilize acetonitrile (aliphatic nitrile) and benzonitrile (aromatic nitrile) as a sole source of energy, carbon and nitrogen for their growth. Based on their growth pattern, 97 isolates of those were able to utilize acetonitrile, of which 7 could also utilise benzonitrile. This result suggests that those isolates are likely to possess enzymes which are able to convert nitriles as indicated by the presence of metabolic byproducts such as carboxylic acid and ammonia. This is to our knowledge the first report of such activity for endophytic bacteria.
PENGARUH KOMPOSISI BAHAN TERHADAP KARAKTERISASI BRIKET LIMBAH BIJI JARAK PAGAR (JATROPHA CURCAS LINN) Sriharti, -; Salim, Takiyah
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.38

Abstract

An experiment on the infl uence of material composition to the characteristic of the briquette jatropha seed waste (Jatropha curcas Linn) has been done. The material consist of jatropha seed waste, rice husk, jatropha seed shell waste and coconut shell. The methods of briquette processing were conducted with carbonization and pressing with hydraulic manual system with capacity of 16 briquette per batch. The result of chemical characteristics of jatropha briquette shows that moisture content, calorie value, fulfi ls the Indonesian National Standards (SNI) number 01-6235-2000, whereas ash content does not fulfi ls the SNI. The result of experiment showed that physical characteristics of jatropha briquette including initial and relaxation density fulfi ls the SNI. The composition of material jatropha seed waste with coconut shell showed the best result with combustion rate of 18.61 gram/minute, specifi c consumtion of fuel 0.0997 gram fuel/gram water, combustion power 161.961 watt and thermal effi ciency 74.27 %.

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