Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Teknologi Indonesia

JTI
Website

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

1 2 3 4 5

UTILIZATION OF BIOPULPING BLACK LIQUOR AS PRESERVATIVE TO FUNGAL ATTACK ON JABON WOOD (Anthocephalus cadamba Miq.) Anita, Sita Heris; Fatriasari, Widya; Zulfiana, Deni
Teknologi Indonesia Vol 37, No 3 (2014)
Publisher : LIPI Press

Biopulping black liquor, byproduct from biopulping process using white-rot fungi (Phanerochaete chrysosporium) that has been incubated for 30 and 45 days, was used as preservative of Jabon wood (Anthocephalus cadambaMiq.). The main objectives of this study was to investigate the effect of various dipping durations of preservative on absorption process into wood and the weight loss of un-preserved and preserved wood againts fungal attack. Preservation method used in this study was dipping method with various dipping durations (i.e. 10, 30, and 60 minutes) with triplicate. The result showed that dipping process of of Jabon wood into biopulping black liquor for 60 minutes demonstrated the highest retention, i.e.0.21 g/cm3. The weight losses suffered fom by un-preserved and preserved Jabon wood were 55.19% to 55.67% and 6.64% to 12.78%, respectively. Biopulping black liquor had improved the resistance of Jabon wood to both white-rot and brown rot fungi attacks compared to untreated wood sample.

PURIFICATION AND CHARACTERIZATION OF WHITE RADISH (RAPHANUS SATIVUS L.VAR LONG WHITE) PEROXIDASE FROM CELL CULTURE EXTRACT Pudjiraharti, -; Karossi, A.T.
Teknologi Indonesia Vol 32, No 2 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i2.8

Horseradish peroxidase (HRP) has been widely used as a component of clinical diagnostic reagent for Enzyme Linked I mmunosorbent Assay (ELISA) technique. White radish as one of Brassicaceae family members was found to have high peroxidase activity. In this study, white radish (Raphanus sativus L. var Long White) was used for the production of peroxidase by cell suspension culture technique. Isolation of the enzyme was conducted by ammonium sulfate precipitation followed by purification using DEAE-Cellulose column chromatography eluted with 0.01 M phosphate buffer, pH 7.5 and 0-0.5 M NaCl gradient. A major peak of protein having the highest enzyme activity and purity 25 folds compared to the crude was resulted. SDS-Polyacrilamide gel electrophoresis showed one main band with molecular weight of 47.000 Da. This white radish peroxidase enzyme is very efficient by demonstrating maximum activity at temperature 55oC and pH 7.5 as well as a Km 76.6 ?g/mL and V max 275 ?g/mL/minute toward hydrogen peroxide substrate and pyrogallol hydrogen donor.

Fabrication of the Soft Magnet using the Mixture of BaFe12O19 - Al2O3 at different Sintering Temperature ginting, masno; Hia, Taufik Hidayat; N, Nasruddin M; Sebayang, Perdamean
Teknologi Indonesia Vol 39, No 1 (2016)
Publisher : LIPI Press

Barium Hexaferrite (BaFe12O19) magnet has been made by adding Al2O3 using metallurgical powder method.Al2O3 with different composition such as 0, 40, 50 and 60 (% weight) was added to Barium Hexaferrite (BaFe12O19),and then sintered at temperatures of 900, 950, 1,000, 1,050, and 1,1000C and each sintering was hold for two hours.From the experiment it is found that some of Al2O3 reacts with BaFe12O19 and results in one new phase of FeAl2O3.Meanwhile, the morphology of the sample is found relatively homogeneous with the rod type particle size whichis less than 1 ?m. The best sample was obtained at 1,1000C sintering temperature, which gives the value of bulkdensity 4.34 g/cm3, porosity 21.98%, and flux density 72.95 Gauss.

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

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.

Magnetic Properties Evaluation of Fe-Al Nanocrystalline Alloys Fabricated by Mechanical Alloying Technique as a Function of Milling Time Tarigan, Kontan; Ginting, Masno
Teknologi Indonesia Vol 35, No 2 (2012)
Publisher : LIPI Press

Magnetic properties of nanocrystalline Fe50Al50 alloys prepared by mechanical alloying technique (using commercial Fe and Al powders as precursors) were studied in detail as a functions of the milling time ranging from 1 to 24 hrs. The structural analyses based on X-ray diffraction (XRD) and extended X-ray absorption fi ne structure spectroscopy (EXAFS) revealed that the alloying process took place after 12 hrs of milling time. Concerning themagnetic behavior, the data that were obtained from a superconducting quantum interference device (SQUID) showed that both the magnetic saturation (Ms) and the coercivity (Hc) depend strongly on the milling time. From the results that we obtain, we found out that by adjusting the milling time, is a key factor in obtaining an appropriate structural transformation and appropriate magnetization values.

Effect of Location, Building Shape, and Wind Turbine Position on the Building for Maximum Wind Energy Potential in Rapid Development Area Sari, Dany Perwita
Teknologi Indonesia Vol 37, No 2 (2014)
Publisher : LIPI Press

High population growth, climate change and energy crises raised awareness in Indonesia especially in Yogyakarta Province which has already arrived at the extreme limit and has been made predominantly for high-rise building design. High-rise building integrated wind turbine is a technology that accelerates wind power from the building elevation. This paper investigated wind velocity on the high-rise building for wind power based on location (wind climate data analysis), building aerodynamic shape and wind turbine position. In the beginning of the study, numerous famous high-rise building was redesigned and simulated using CFD simulation to find the most effective building design. The redesign and simulation were then validated using wind tunnel experiment. Thispaper focuses on guidance resulting on wind power density of Yogyakarta Province to predict the wind energy. The prediction was then combined with best design of aerodynamic building. The result shows that building energy can be optimized through aerodynamic building design, wind turbine position and best geographic area and climate to achieve maximum wind power.

ENDOPHYTES RHIZOBIA BACTERIA, ISOLATED FROM ACACIA MANGIUM, ITS POTENSIAL TO SUPPORT THE GROWTH OF SOYBEAN. Sukiman, Harmastini
Teknologi Indonesia Vol 38, No 3 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i3.225

Acacia mangium is a legume tree species which has high tolerance with many different conditions and dry area. Aim of this research is to study the possibility of cross inoculation of rhizobium endophytic bacteria isolated from Acacia mangium to soybean plant and to find out the best combination of inoculants to develop biofertilizers quality. Isolation of rhizobium endophytes from Acacia mangium analysed using 16S rRNA methods identified that the bacteria belonged to Rhizobia tropici. Results showed that single inoculation of endophytic bacteria can produce soybean seed up to 19.71 gram which was slightly higher compared with control plants of 16.0 gram and chemical fertilizer treatment plants of 18.0 gram per plant. Meanwhile, Rhizobium inoculation still gave the best production of soybean; that is 28 gram per plant. Moreover, stress test results showed that the bacteria could adapt better with acidity and salinity, including UV exposure and cold condition, yet were unable to adapt with hightemperature and oxidative condition.

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

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.

EFFECTS OF NUTRIENT CONCENTRATION IN MULTI STAGE FEEDING OF THE GROWTH OF MICROALGAE Nannochloropsis sp. Sriwuryandari, Lies; Priantoro, Ekaputra Agung; Sembiring, Tarzan
Teknologi Indonesia Vol 40, No 2 (2017)
Publisher : LIPI Press

Renewable energy plays an important role for a sustainable future and the use of microalgae Nannochloropsis sp., as a potential source of biofuel due to its high lipid content, makes a good option. The nutrient found in the growth medium of microalgae have been found to affect cell synthesis, lipid synthesis, as well as its fatty acid profile. This study was conducted to observe the effects of the N-P concentration utilizing multistage feeding on the performance of Nannochloropsis sp. Sodium bicarbonate, urea, and sodium dihydrogen phosphate monohydrate were used as sources of C, N, and P for the microalgae. The nutrient feeding needed was calculated based on a molecular formula of microalgae(CO0.48H1.83N0.11P0.01) with a production target 1g.L-1 cell biomass. Element C is an iso-molar. The concentration of N- P varies: corresponding to the mol-fraction of the microalgae cell (as a control) and 10% excess. There were four levels of treatment: A (U0P0); B (U10P0); C (U0P10); and D (U10P10) with three replicants in the batch culture system. Nutrient feeding was conducted in three stages: I (40%); II (30%);and III (30%) and incubated in a neutral environment. Nannochloropsis sp. was able to grow well at a temperature of 24–35°C and an acidity level (pH) of 9.0–10.5. The culture (on the 21st day) produced DCW 0.93; 1.04; 0.86;1.12g.L-1, Chlorophyll-a 7.08; 7.62; 4.64; 6.85% DC, lipid 19.2; 15.5; 27.3; and 21.6% DC for treatments A; B;C; and D, respectively.The maximum lipid level resulted in an N deficiency and a P surplus (C). The lipids of the Nannochloropsis sp. composed of 66.0–81.1% saturated fatty acid which is suitable to be used as a biofuel.

APLIKASI PENGELOMPOKAN DATA (CLUSTERING OF DATA) DALAM MEMUDAHKAN MONITORING KETERSEDIAAN BAHAN BAKU OBAT Suwarningsih, Wiwin
Teknologi Indonesia Vol 35, No 1 (2012)
Publisher : LIPI Press

Periodic monitoring of drug raw materials in order to search for expired materials is still done manually. Thus the process of searching for these raw materials is usually slow, since data are store using number based application. Therefore this paper will be discussed how the data for drug raw materials are managed using clustering data mining methods. Drug raw data are stored using clustering so that the searching process will be easier andthe searching time is faster. The result of this research will allow user application to monitor and search for raw materials more easily.

Page 3 of 17 | Total Record : 163

1 2 3 4 5

Filter by Year

2009 2018

Filter By Issues

All Issue Vol 41, No 1 (2018) Vol 40, No 2 (2017) Vol 40, No 1 (2017) Vol 39, No 3 (2016) Vol 39, No 2 (2016) Vol 39, No 1 (2016) Vol 38, No 3 (2015) Vol 38, No 2 (2015) Vol 38, No 1 (2015) Vol 37, No 3 (2014) Vol 37, No 2 (2014) Vol 37, No 1 (2014) Vol 36, No 3 (2013) Vol 36, No 2 (2013) Vol 36, No 1 (2013) Vol 35, No 3 (2012) Vol 35, No 2 (2012) Vol 35, No 1 (2012) Vol 34 (2011) Vol 33, No 2 (2010) Vol 33, No 1 (2010) Vol 32, No 2 (2009) Vol 32, No 1 (2009) More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kota adm. jakarta selatan, Dki jakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA