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JURNAL TEKNOLOGI TECHNOSCIENTIA
Published by Institut Teknologi Nasional Yogyakarta
ISSN : 27148025     EISSN : 27148025     DOI : https://doi.org/10.34151/technoscientia
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Focus and Scope JURNAL TEKNOLOGI TECHNOSCIENTIA sebagai wahana publikasi karya ilmiah/penelitian di bidang teknologi atau rekayasa, meliputi: 1. Teknik Kimia 2. Teknik Industri 3. Teknik Mesin 4. Teknik Elektro 5. Teknik Informatika 6. Teknik Geologi 7. Teknik Lingkungan
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 15 Documents
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Search results for , issue "technoscientia vol 7 no 2 februari 2015" : 15 Documents clear
PENGARUH PROSES EKSTRAKSI BERTEKANAN DALAM PENGAMBILAN LIPID DARI MIKROALGA JENIS NANNOCHLOROPSIS SP. DENGAN PELARUT METANOL Purwanti, Ani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.197

Abstract

Microalgae is one of the raw material for biodiesel. Recently, microalgae oil is developed as an alternative fuels to substitute fossil fuels. Lipid was extracted from microalgae and then it was used to produce biodiesel. In this study, the development extraction process is the main issues to investigate the optimum condition. In this research, to get the maximum yield of lipid from microalgae the extraction used an autoclave with high pressure. The microalgae used has water content of 5%, 50%, and 80%. Extraction of 20 gram dried microalgae using 200 mL of methanol as a solvent was carried out in an autoclave at various of pressure (25 psi, 45 psi, 65 psi, and 75 psi). The extraction process was varied from 30 minutes up to 120 minutes. The lipid and methanol was separated from microalgae as biomass by filtration, then the mixture was distilled to separate lipid from methanol as a solvent. The extracted lipid was weighted to determine the yield of lipid. The optimum lipid extraction yield (31.02% as mass of lipid/mass of dried microalgae), was obtained under the following extraction conditions: 200 mL methanol/ 20 gram dried microalgae for 120 minutes processing in 45 psi of process pressure.
SINTESIS KITOSAN SUKSINAT DARI KITOSAN DAN SUKSINAT ANHIDRID SERTA KARAKTERISTIKNYA melati, Arsyi; Iskandar, Dodi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.198

Abstract

The purpose of this study was to determine the effect of molecular weight of chitosan towards the solubility of chitosan succinate in water. The chitosan succinate was synthesized by succinilation method. In the synthesis, chitosan with different molecular weight, low molecular weight (LMW), medium molecular weight (MMW), high molecular weight (HMW) were reacted with succinate anhydride (1:10) for 24 hours. The infrared spectra of chitosan succinate, showed by wavenumber shift, indicating that there has been interaction between chitosan and succinate anhydride. Based on results of analysis of the characterization of chitosan succinate (Analysis of nitrogen,analysis of degree of substitution, and solubility test in water), succinate chitosan HMW (High Molecular Weight) has the highest level of solubility. At temperature of 800C, it dissolves until 99.34% of solubility, the succinate chitosan has 2.98% of nitrogent content, and 0.60 of degree of substitution. From this research can be inferred that larger molecular weight of chitosan can lead into a higheer degree of substitution and solubility values in water.
EKSTRAKSI INFORMASI KONTEN WEB MENGGUNAKAN PENDEKATAN BERBASIS ONTOLOGI Susanti, Erma
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.199

Abstract

Most of information on the Internet is transmitted through unstructured information via websites. Information in the web pages usually contains main content, advertisement, navigation and other additional information. The amount of information makes it difficult to obtain the core information, value and relevant knowledge inthe form of structured information, like databases. Information extraction is a process to converting unstructured information into structured information. Applying information extraction method using ontology called Ontology-Based Information Extraction (OBIE) aims to provide semantic content for semantic web and perform extracting process using semi-automatic method (a method to minimize human intevention in extracting process). A case study to apply information extraction used “LonelyPlanet” dataset.
IMPLEMENTASI SEGMENTASI PEMBULUH DARAH RETINA PADA CITRA FUNDUS MATA BERBASIS HISTOGRAM EQUALIZATION DAN 2D-GABOR FILTER Wicaksono, Fahmi Arya
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.200

Abstract

Medical Technology is growing by the growth of the era. The detection of illness which is suffered by human can be detected earlier by doing observation of the symptom that emerge from the sufferer. The observation of the symptom can be done to the human organs which are probably changing because of illness, for example: the retina of eye. The changing of the structure can be seen is the blood vessel which becomes bigger or the disorder of the blood vessel of the retina of eye. In order to detect the illness, initial stage is to perform segmentation of the blood vessel. This study is using 2D-Gabor filters for segmenting the image. It is divided into 2 stages, namely preprocessing and segmentation. In the early stage of preprocessing consists of taking the green channel image, and improve the image contrast by Histogram Equalization. And the second stage is segmentation by 2D-Gabor filter method, thresholding the image, clean up the image of the noise, and the field of view. Then the results of the process compared with the groundtruth image to calculate the level of accuracy. The test performed on a database of Digital Retinal Images for Vessel Extraction (DRIVE) as many as 20 images. The accuracy of the results obtained from this test was 81.11%. The image of the result of segmentation is quite good, so the 2D-Gabor filter can be properly segmenting.
SISTEM REKOMENDASI PEMBELAJARAN PADA E-LEARNING MENGGUNAKAN ALGORITMA CT-PRO Ummah, Khoirul
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.201

Abstract

The progress of information technology in education, especially the use of e-learning in education institutions developed rapidly, SMA 2 Pamekasan was an example of schools that could use elearning. However, the teachers only used to take the value of the test, assignment by the teacher and to access course materials. Therefore, in this research use data that are considered essential to assist teachers measured students’s progress and help students answer the difficult questions. Subjects that used in this e-learning was chemical. Chemical was one subject that was considered difficult by most students. So, this application would help students solve a problems. The algorithm that used in this application was a ct-pro, it was algorithm of association rules to find combinations of data’s relations. The data were the wrong answers of 150 students. Questions consist of 400 numbers and 20 learning materials. In this research, the data was divided into 6, the data from 5 students, 30 students, 60 studenst, 90 students,120 students and 150 students. The results of this reseacrh was if there were more data, the combination formed itemset also be more and more, and the processing time will also be longer. However, if the greater the minimum support was entered, then the combination was formed will be less.
SPEKTRUM BUNYI ALAT MUSIK KENTONG BERDASARKAN VARIASI JUMLAH LUBANG Sarah, Siti
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.202

Abstract

The goal of this research are knowing sound spectrum by kentong; and knowing correlation between the amount of kentong’s hole and sound frequency. The sound is recorded in quite situation with computer which instaled by sound software. Then, the recording sound is analysed the frequency pattern in prominent and harmonic frequency. As a result, the frequency pattern of kentong with one hole formed in prominent frequency. The frequency pattern of kentong with two holes formed in prominent, first harmonic, and second harmonic frequency. The frequency pattern of kentong with three holes formed as same as kentong with two holes. The frequency pattern of kentong with four holes formed until the fiveth harmonic frequency. There is corelation between sound frequency and the amount of kentong with formula y = -86,125x2 + 515,34x + 57,375 dan determinant value = 0,9779.
PEMBANGKIT LISTRIK ENERGI MATAHARI SEBAGAI PENGGERAK POMPA AIR DENGAN MENGGUNAKAN SOLAR CELL -, Subandi; Hani, Slamet
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.203

Abstract

This paper discusses the application of solar cells as an electric power source and the electricity generated is used to a drive water pump. The working principle of solar power plants is the conversion of energy contained in to electricity. When these photons strike the surface of the solar cell electrons will be excited and generate electric voltage. Electricity generated from the solar cell is direct current (DC) to charge a battery, which in turn is converted into alternating current (AC) using an inverter. The testing stage carried out in the field is to find the to main parameters whichare the voltage and amperage. Battery is charged by the solar cell to accumulate the solar energy into electrical energy. The produced solar cell voltage ranges from 14.8 to 17.5 volts DC. The Solar cells used are of panel type polycrystalline (poly-crystalline) with a power of 50 wp. Current and voltage of the solar cell source varies depending on the incident sunlight power the cell voltage is ± 17V, but charging the battery the average voltage is 13,5V which is secured by the solar charger controller. Voltage and current will begin to rise in the morning at 07.00 am, then reach the maximum level during the day at 10:00 a.m to 13:00 p.m, and begin to fall in the afternoon.
PENGARUH PENGELASAN FCAW TANPA DAN DENGAN PENAMBAHAN PANAS TERHADAP PERUBAHAN SIFAT MEKANIK DAN STRUKTUR MIKRO SAMBUNGAN LAS Subeki, Nur; -, Jamasri; Ilman, M.N.; Iswanto, P.T.
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.204

Abstract

The Welding processes are delivery used joining steel, especially used in civil construction, piping and ship manufacturing. Many of the benefits that can be obtained from welded joint is the joining can be cheap, rapid manufacturing, varied shape and lighter construction. One of the welding techniques that is widely used for joining the steel construction is Flux Core Arc Welding (FCAW). The problem that found in welding joints is the tensile strength in welding area is low and uneven hardness in the weld joint. The aim of this research was to determine the mechanical properties of FCAW Welding process and find out micro structures formed by the addition of heat around the welding.In this research, FCAW welding has been divided into two groups; the ones group is manufacturing without addition of heating, and the second group is manufacturing by heating 200 °C. Every group of manufactures would be test by chemical compositions, macro photos, micro photos, tensile strength and hardness number. The results of this research shows that the addition of heat at 200 °C could be increase the yield strength and ultimate strength. The heating also could be very small impact on the change in the hardness of weld area, but it could be reduce the hardness in HAZ area significantly. Micro structure formed then the weld area has been dominated by acicular ferrite micro structure, grain boundary ferrite dominate in coarse HAZ, the pearlite and ferrite with grain aggrandizement take place in smooth HAZ and base metals.
UNJUK KERJA ALAT PENGERING GULA SEMUT DUA BELAS SUSUN MENGGUNAKAN BAHAN BAKAR LPG Johanes, Susanto; G., Sukartono,; S., Soeadgihardo
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.205

Abstract

Modified dryer is used as an alternative methodfor drying the production of coconut sugars (gula semut / gula merah) or coconutcrystal sugars for farmers or micro entrepreneurs, especially when production is increased or in the rainyseason. This study aims to determine the performance of drier gula semut own design, with LPG fuel. Construction drier consists of a framework to support stainless steel pans as the container of sugars, measuring 78 cm x 74 cm x 4 cm, which is composed of twelve level, with a gap distance of 5 cm. The pans arranged vertically, so that the bottom of the pan gets hot either by radiation, conduction, and convection by the flow of hot air that is exhaled by the blower, while the pans that is above it also will get heat by conduction and convection by hot air which flows through it. The tests of dryers are conducted in two methods: with load and without load. The weather conditions are dry bulb temperature of 30°C and 27°C wet bulb. In the no-loaded testing, to achieve a working temperature of the drying chamber at 60 °C, it takes approximately 40 minutes. While testing with load is drying 8 kg / pan and 10 kg / pan sugars. On this burden, to reduce the water content of about 6% to between 2-3%, required 5.5-7 hoursdrying time, and required the consumption of fuel (LPG) between 1.15 to 1.35 kg. The rate of the average water content decreasedis 0.66% per hour, and the total efficiency of the dryer (ηT) is 23%.
KAJIAN KERENTANAN MASYARAKAT DALAM PENGELOLAAN DARATAN WILAYAH PESISIR KOTA KUPANG TERHADAP ANCAMAN GELOMBANG TINGGI Wibowo, Tri U.; Kotta, Herry Z.; Effendi, Jauhari
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.206

Abstract

Kupang City is the capital of East Nusa Tenggara Province located in Kupang Bay, based on historical data has encountered several of the earthquake that caused high tide. This study aims to obtain vulnerability of coastal society in land management of Kupang City coastal through those natural disasters, this study covers 15 villages located along the coast of Kupang City. Determination of the vulnerability using spatial analysis with GIS software Quantum Valmiera 2.2 and ArcGIS 9.3 , descriptive statistics, scoring systems and weighting limitation vulnerable areas under 10.5 meters above sea level, which is an overlay be physical vulnerability map. Physical vulnerability variable such as structured area, and the density of buildings.Non-physical vulnerability variable such economic area parameters, livelihoods, and population density. Environmental vulnerability variable parameters such as elevation, distance from the shoreline and coastal protection forest .There are three levels of vulnerability; high, medium, and low. From the resulting overlay of each variable and parameters obtained the vulnerability of coastal areas in Kupang City was dominated by the 9 villages with medium vulnerability, 1 village with high vulnerability, and there are no villages in the low vulnerability. 5 villages are safe from high tides.

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