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 7 Documents

Search results for , issue " Vol 38, No 2 (2015)" : 7 Documents clear

HYDROGEOLOGICAL STUDY TO SUPPORT SIGANDUL BRIDGE CONSTRUCTION AT PARAKAN, TEMANGGUNG, CENTRAL JAVA Utomo, Edi prasetyo; Purwoarminta, Ananta
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

The plan of making bridge on the Sigandul river in Parakan, Temanggung regency is to improve the quality access roads in the Province of Central Java. The first step was to make the construction of the bridge pillars as the foundation of the bridge. For that purpose it was done drilling with planning a depth of 18 m, but at a depth of 12 m there was out of groundwater in a large discharge. This large groundwater discharge has disturbed the bridge construction process. The aim of this research is to analyze the causes of groundwater discharge and to provide a recommendation on counter measure of disturbance in the process of bridges construction based upon the hydrogeological condition. The methods used in this research were conducting a geological observation on ground surface and geoelectrical measurement with a dipole-dipole electrode arrangement. The results showed that the subsurface of research area is the site of groundwater accumulation and steep slope of its surrounding makes the groundwater came out with high pressure. Discharge rate of groundwater outflow in the area was 91.42 liters per second. Based on these conditions, it is recommended that the process of making a bridge construction should be done by first reducing the groundwater pressure or otherwise moving the foot of bridge the east side.

CREEP LIFE ASSESSMENT OF HIGH PRESSURE FEED WATER HEATER (HPFWH) SHELL AT COAL FIRED POWER PLANT Alam, Hilman Syaeful; Djunaedi, Imam
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i2.125

The creep life of high pressure feed water heater shell of coal-fired power plant has been evaluated using the fitness for service (FFS) assessment based on creep rupture life calculation. The purpose of this study is to determine the remaining life of the component due to prolonged exposure to high operating temperatures and loading conditions. The assessment procedures consist of level 1, 2, and 3, the operating time which is evaluated based on the designed life of the components, i.e. 25 years. Based on the assessment results using level 1, total creep damage does not meet the requirements because the operating life is below the 25-year designed life, equal to 219,000 hours. However, based on the results of level 2 assessment, the component successfully achieves the design life with remaining life of 204,042 hours. These results are consistent with the assessment results obtained by level 3, but the remaining life of the component is only 6,806 hours after operated for 25 years.

CLASIFICATION OF PEAT WATER QUALITY IN GIAM SIAK KECIL BUKIT BATU BIOSPHERE RESERVE, PROVINCE OF RIAU Sutapa, Ignasius Dwi Atmana
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

The unsolved problem in Riau Province was the availability of clean water, since the province is dominated with peat land. Around Giam Siak Kecil Bukit biosphere reserve area are several potential sources of surface water that can be used as source of raw water. The aim of this study was to assess the peat water quality out of selected sites within Tanjung Leban area using STORET method in order to find out its quality classification and to try to improve its quality using a jar test lab scale. Based on the preassessment over four locations, Air Raja River was selected for it had several characteristics such as the water color was reddish and homogenous, had no sediment, had relatively constant water flow throughout the year, and was located on the edge of the road. Yet there were people's daily activities at the body of the river i.e. bathing, washing, and toileting. Based on its physical quality, the peat water had color levels ranging from 462 to 503 TCU, stench, and sour taste. The non-metallic chemical test of the peat water resulted in showing that it had pH 3.52. The peat water also contained Coliform bacteria and E. coli as many as 70 and 630 col/100ml, respectively. After going through STORET method analysis, the total score was -26, which means it had C status the quality of pollutans of which was light. After several physical and chemical quality improvement efforts using jar test, water quality could be improved up to A class (zero score).

EFFECT OF DEXTRIN AND LACTOSE IN PREPARATION OF POWDERS DOSAGE FORM FROM Centella asiatica EXTRACT Saraswaty, Vienna; Risdian, Chandra; Mozef, Tjandrawati; S. Kardono, Leonardus Broto
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Objective of this research is to investigate the influence of dextrin and lactose in preparation of dosage form from Centella asiatica (CA) ethanol extract. Powders dosage form of CA ethanol extract was prepared by kneading method. Previously, it had been known that to create CA extract concentrate long time is needed, i.e. more than 7 days. Drying preparation of CA extract by thin layer film in oven blower at 50oC gave a shorter drying time, i.e. 6 hours but it gave sticky form at the end of process. Preparation process to produce powders dosage by using dextrin and lactose was succesfully investigated in our laboratory. It resulted that dextrin was appropriate filler for preparation of CA extract powder. Powder dosage form of CA extract could be obtained after 6 hours of drying and using 30% w/w of dextrin (based on the weigh of wet extract at density of 1,000 gr.mL-1). Difference on amount of dextrin in CA extract gave influence on water content, acidity (pH), compressibility index, haussner ratio, flow propert,y and angle of repose significantly.

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

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.

SUB-ACUTE TOXICITY STUDY OF CENTELLA ASIATICA AQUEOUS EXTRACT ON THE LIVER OF RATS: DOSE-RESPONSE RELATIONSHIP ASSESSMENT Wiyono, Tri; Nurlaila, -
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Pegagan or Centella asiatica (CA) is a quite popular medicinal plant which has various properties such as anti-inflammatory and wound healing. Unfortunately, research on the toxicity of CAis still hard to find. Toxicity test of CA on spermatogenesis process had been done in previous research meanwhile its long term toxicity test has not been done. The aims of this study were to evaluate the toxicity of CA aqueous extract and to determine the relationship between the dose and toxic response when given to rats within 15 days. Forty Sprague-Dawley male rats were divided into 4 groups, then administered orally with 450, 900, 1,800 mg/kgBW of CA aqueous extract and 10 ml/kgBW distilled water as control. Observation on the liver histopathology and the levels of aspartate aminotransferase (AST) also alanine aminotransferase (ALT) in the blood indicated that there was a relationship between the dose and toxic response of CA aqueous extract on repeated administration during 15 days treatment in rats. Level of toxicity rose from congestion, steatosis, to cell necrosis. Dose of 1,800 mg/kgBW potentially led to necrosis of liver cells of rats.

RHODOCOCCUS PYRIDINIVORANS STRAIN TPIK, A NITRILE-DEGRADING BACTERIUM ISOLATED FROM TAILING POND OF ANTAM GOLD MINING INDUSTRY , PONGKOR Sulistinah, Nunik; Riffiani, Rini; Sunarko, Bambang
Teknologi Indonesia Vol 38, No 2 (2015)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v38i2.158

Nitriles are widely manufactured and extensively used by chemical industries as synthesis intermediates. Although these compounds are generally highly toxic, due to their cyano functional group, they can be used by some microorganisms as carbon and/or nitrogen sources. Nitrilase catalyzes the direct cleavage of nitriles to the corresponding acids and ammonia, where as nitrile-hydratase catalyzes the hydratation of nitriles to amides. Applications of these nitrile-converting enzymes are now increasingly recognized for the production of several pharmaceutically important compounds and fine chemicals. By virtue of their capability to eliminate highly toxic nitriles, the enzymes also play a significant role in protecting the environment. Accordingly, it is very important to find microorganisms that have a great capacity to utilize or degrade nitriles. Recently, a bacterial isolate TPIK which shows high nitrile degrading activity has been isolated. The strain was isolated from tailing pond of gold mine activity by selective enrichment methods. TPIK was shown to be capable of degrading high concentrations of nitrile (up to approx. 1 M acetonitrile). Colonies of TPIK are light orange in colour and have irregularly round wrinkles. The cells of TPIK are non-spore-forming, non motile and Gram-positive, but are Gram-variable in old cultures. The cells are rods and brached fillaments during the early growth phase and then fragmented into short rods and cocci. The taxonomic position of TPIK was clarified using molecular genetic methods. The phylogenetic tree showed that bacterial isolate TPIK falls within an evolutionary radiation comprising Rhodococcus species and is most closely related to the type strain of Rhodococcus pyridinivorans, sharing 99% 16S rDNA similarity. To the best of our knowledge, this was the first time that Rhodococcus pyridinivorans has been described as containing nitrile-degrading enzymes. Usually, this bacterial strain has been studied for its ability to degrade carcinogenic compounds, like pyridine.

Page 1 of 1 | Total Record : 7

Filter by Year

2015 2015

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

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

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA