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INDONESIA
Jurnal technoscientia
Published by Institut Sains dan Teknologi AKPRIND
ISSN : 19798415     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Arjuna Subject : -
Articles 16 Documents
 1   2 
Search results for , issue "Academia Ista Vol 12 No 01 Agustus 2007" : 16 Documents clear
PENGARUH EFISIENSI PEMBASAHAN KATALIS TERHADAP KONVERSI SO2 DALAM REAKTOR TRICKLE BED -, Mahfud; Husodo, F.; Irawan, C.
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (188.143 KB) | DOI: 10.34151/technoscientia.v0i0.1988

Abstract

Trickle-bed reactors, in which gas and liquid flow concurrently downward, is po-tentially useful for oxidation catalytic of SO2 with activated carbon as catalyst. To predict trickle bed reactor performance and model its behaviour, it is necessary to know what fraction of the catalyst is effectively wetted by the liquid phase. It is known that contacting efficiency can have a significant effect on the catalyst effectiveness factor for partially wetted catalyst particles. The dynamics tracer method with pulse input is an efficient me-thod for determination of liquid-solid contacting. Axial dispersion, residence time distributi-on also can be evaluated with this method. The aims of this research are to study the in-fluence of catalyst wetting efficiency in trickle bed reactor on reaction catalytic oxidation SO2. The experimental apparatus is a trickle bed reactor with 4.8 10-2 m column diameter and 35 10-2 m length. The column is packed with activated carbon. The operating conditi-ons of reactor are liquid flow rate 12.2 – 23.7 10-6 m3/s, gas flow rate 133 – 243.4 10-6 m3/s, atmospheric pressure, and room temperature. The NaCl solution is used as a tracer with impulse injection mode and a conductometer, which connected to personal compu-ter, detects the outlet tracer concentrations. The results show that the wetting efficiency increases significantly with liquid flow rate, but it slightly increases with gas flow rate. Wetting efficiency is considerably influenced by the form of packing particle and increa-sed with the bed voidage. Catalytic oxidation of SO2 in trickle bed reactor attains steady state condition about no more than 60 minutes. Conversion of reaction increases with li-quid phase rate and the increasing wetting efficiency will increase this conversion.
ANALISIS PERBAIKAN SISTEM PENTANAHAN PADA KAKI MENARA SALURAN TRANSMISI TEGANGAN TINGGI 150 KV BANTUL-SEMANU JOGJAKARTA Suyanto, Muhammad
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (165.826 KB) | DOI: 10.34151/technoscientia.v0i0.1989

Abstract

The research was carried out to get information about the improvement of gro-unding resistant value in tower feet of-high-voltage network, 150 kV, along tower trans-mission in power station, Bantul, Semanu. A good grounding system is used to flow cur-rent into the ground and prevent the current flow into the electrical equipment if electrical fault occurs. The result of measurement has shown that ground, type grumosol has a low grounding resistant value <10 Ω because its ground texture of clay has high ability to absorb and keep water and has very tiny particles and colloid property. The grounding resistant values of type regusol, litusol, brown latosol and red mediteran are above 20 Ω because of their ground texture, sand and clay. Chemical and physical reaction will take places in soil with clay structure. Its colloid property can tie/hold ion or water and sometimes free salt. The aim of this research is to get information about resistant value of soil type with almost ≤ 5 Ω by installing grounding electrode made from four galvanis steel coated with bronze with 15 mm in diameter, 10 meter long and two ground rods are parallel connected with 2 m each electrode and use counterpoise grounding system model. The result of the improvement is expected to meet standard requirement, SPLN almost ≤ 5 Ω.
EVALUASI KUALITAS DAN KETERSEDIAAN AIR PULAU KARIMUNJAWA-KEMUJAN KEPULAUAN KARIMUNJAWA, KABUPATEN JEPARA Hartanto, Priyo; S, I. Hadi
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (583.679 KB) | DOI: 10.34151/technoscientia.v0i0.1992

Abstract

Karimunjawa islands became an important area since it decided as a part of Karimunjawa National Park area so that become an area of tourism on the base sea resources. From morphogenetic point of view, Karimunjawa-Kemujan Islands is an petabah type islands, which is characterized by the wide about 20,8 km2 and 11,4 km2, and it can be classified as a small islands. Lithologically, these islands consists of sandstone, sandstone interbaded, clay, metamorphic and granitic rocks. The avarage of annual rain up to 3120 mm with total of rain days for a year is 114 days, so that water resources Island in Karimunjawa-Kemujan are very limited. Shallow groundwater zone with limited potensial and locally distributed in plain morphology can be get at less then 10 meters in depth. In general, the water quality in Karimunjawa-Kemujan islands still good as the standard of drinking water. From this research, the groundwater in Karimunjawa island can be grouped to 3 zones which it based on Electrical Conductivity values that are: (a) zone of 1054-2250 mS/cm, (b) zone of 100-1000mS/cm and zone of 57-59,6 mS/cm. In the other, EC value of water in Kamujan island generally is less than 100 mS/cm.
ANALISIS PEMBERIAN INSENTIF KERJA BERDASARKAN FISIOLOGI KERJA DITINJAU DARI ASPEK ERGONOMI Simanjuntak, Risma A.; Maedi, Mukhamad
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (150.597 KB) | DOI: 10.34151/technoscientia.v0i0.1994

Abstract

Metal found company, CV Gunung Mas is company which move in heavy indus-try field. The products are drinking water pipe, gas pippe, oil pipe, etc appropriate with the order. The heart beat measuring only form measuring of energy consumtion indirectly. The more energy consumption requirement for work activities (heacy work) the more e-nergy consumed. In work physiology, 4 Kkal/menit will be considered as consumed ener-gy maximum to do heavy physic work continually. From the result of consumed energy analysis and extra wage for employees of CV. Gunung Mas in every work activity is furnace activity consume average 4,9419 Kkal/ minutes, they get extra wage in the amount of Rp 9.500 ; process of printing activity consume average energy 4,6917 Kkal/minutes, they get extra wage in the amount of Rp 5.250; grinding activity consume average energy 4,3188 Kkal/minutes, they get extra wa-ge in the amount of Rp 2.800; drilling activity consume average energy 4,2075 Kkal/mi-nutes, they get extra wage in the amount of Rp 1.750 ; storing activity consume average energy 4,1922 Kkal/minutes, they get extra wage in the amount of Rp 1.000 ; Those activity is heavy work activity. CV Gunung Mas company had been giving axtra wage appropriate with cosumed energy (from the result analysis)
DESIGN AND CONSTRUCTION OF RENOGRAPH FOR RENAL FUNCTION TEST USING CsI(Tl) DETECTOR AND MICROCONTROLLER AT89C51 -, Setyadi; Isaris, Rill
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.454 KB) | DOI: 10.34151/technoscientia.v0i0.1996

Abstract

The development of Renograph prototypes for renal function testing has been initiated in BATAN since 1983, five generation prototypes using NaI(Tl) Scintillation de-tector have been successfully constructed and utilized in hospitals. Due to the new re-gulation for human safety, then the use of low energy radioisotopes with shorter half life time should be considered. It requires to develop the new instrument of higher sensitivity and better performances. This paper presents design of renograph using CsI(Tl) scintillation as a new type detector and a 16 bits Microcontroller AT89C51 as the data processor for renal function test, so renograph with a high reliable and better performances in application is achie-ved. The use of CsI(Tl) and Microcontroller as the data processor is the development made from the previous prototypes, the system is also provided with a serial commu-nication facility to Personal Computer through serial-port RS 232. Static examination to the pulses generated by a Function Generator with fre-quency up to 12.000 Hz and the dynamic test using 137Cs and 60Co radiation sources have been carried out successfully. The non-linearity integral of the system shows the response is linear up to frequency of 65.000 Hz with strong correlation coefficient, that is R2 ~ 0,9999. The calculation of the statistical feasibility counting to the both CsI(Tl) detector equipments for the two sources above with confidence level of 0,95 give the χ2 are 0.238 and 0.078. These are much smaller than the χ2 value in the table, that is 0.711 for N = 5. Hence, the modified renograph system using CsI(Tl) and Microcontroller AT89C51 has good counting linearity and fulfills the counting feasibility statistically.
STUDI SIMULASI TRANSIEN AKIBAT SAMBARAN PETIR PADA SALURAN DISTRIBUSI 20 KV DI YOGYAKARTA DENGAN BANTUAN EMTP Hani, Slamet; Sabdullah, Mursid
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 01 Agustus 2007
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.145 KB) | DOI: 10.34151/technoscientia.v0i0.1997

Abstract

The transient over-voltage phenomenon in an electrical power system caused by weather factors for example rain, lightning and wind, as well as by technical factors for example switching, power electronic and electrical machines. This research was conducted for at distributed transient over-voltage on a 20 kV, and 3 phase 4-wire system, due to thunder pounce. A simple way for the analysis uses EMTP program (Electromagnetic Transients Program) which is a simulation tool to this case (At 20 kV distribution line from Kentungan Power station to Kalasan-Yokyakarta). The results show that transient over-voltage occurred along the distribution lines, and the voltages vary along the distribution line length and the location where the thunder struck.

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