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JURNAL TEKNOLOGI TECHNOSCIENTIA
Published by Institut Teknologi Nasional Yogyakarta
ISSN : 19798415     EISSN : 27148025     DOI : https://doi.org/10.34151/technoscientia.v8i2.161
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
JURNAL TEKNOLOGI TECHNOSCIENTIA dengan ISSN: 1979-8415 dan E-ISSN: 2714-8025 merupakan jurnal ilmiah yang diterbitkan LPPM Institut Sains & Teknologi AKPRIND Yogyakarta sebagai wahana publikasi karya ilmiah/penelitian di bidang teknologi atau rekayasa meliputi bidang teknik kimia, teknik industri, teknik mesin, teknik elektro, teknik informatika, teknik geologi, dan teknik lingkungan, terbit dua kali setahun pada setiap bulan Februari dan Agustus. Setiap naskah yang dikirim akan dilakukan review secara tertutup. Hasil review naskah meliputi: DITOLAK atau DITERIMA DENGAN PERBAIKAN atau DITERIMA. Setiap naskah yang dinyatakan DIITERIMA dan DITERBITKAN dikenakan biaya proses dan cetak sebesar Rp. 250.000,- (di luar biaya pengiriman) dikirimkan via transfer ke: Bank Mandiri Cabang Yogyakarta No.: 137-00-1255210-1 an.: Prof. Dr. Ir. Sudarsono, M.T.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 534 Documents
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RELIABILITY-CENTERED MAINTENANCE (RCM) EVALUATION METHOD IN THE INDUSTRY APPLICATION, CASE STUDY: FERTILIZER COMPANY, INDONESIA Khasanah, Rahayu; Dawal, Siti Zawiah Md.; -, Jamasri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 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.v8i1.190

Abstract

Nowadays, Reliability-centered Maintenance (RCM) has become the solution to determine the type of maintenance tasks and inspections needs to be performed to the assets in achieving effective and efficient maintenance. However, implementing RCM is not enough to achieve optimization of maintenance planning. The evaluation, as one of the important point should be done to prove the benefits of RCM and to continuously improve the maintenance planning. In this study, the effects of RCM implementation in the industry application were evaluated, as a step for continuous improvement in RCM application. The case study is an Ammonia plant in a fertilizer company in Indonesia. This research evaluates the RCM effects by investigating and analyzing Downtime Loss and Mean Time between Failures (MTBF). The problems in RCM implementation in the case study also investigate as a basic for giving the recommendation to the company as a way to improve the RCM implementation. In general, the findings from the investigation of case study affirm that RCM implementation do improve the plant performance which are showed by decreasing of Downtime Loss and Mean Time between Failures. The significant problems that become pitfalls in RCM implementation process are about the worker’s culture and understanding on the RCM process. Overall, the study shows that RCM implementation brings many benefits to the company by decreasing the Downtime Loss and Mean Time between Failures which can be resulted as the higher profit for the company.
PENGUJIAN KUALITAS AIR ASAM TAMBANG PADA TAMBANG BATUBARA PT. Bukit Asam Tbk – Tanjung Enim Rembah, Rina
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 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.v8i1.191

Abstract

Mine drainage was problem in mining aktivity at activ periode and mine closure. And will be enviroment issue from mine drainage is water quality, what is Pontentially Acid Forming or Non Acid Forming. For to know water quality will be forming, as the firts step is understanding about stone geochemical characteristic. Stone of behavior can be knew base on geochemical characteristic by step testing are static test with testing sulfure total, pH paste, pH NAG, ABA methode and verification with kinetic test by Free Draining Column Leach Test with physic and chemical testing, also mineralogy testing with X-RD for to know mineral composition in stone. Base on characteristic result can be get stone type potentially acid forming/ PAF and non acid forming/NAF. Then water quality test as leachate stone PAF/NAF by kinetic quality test. From this research, result of type the stone are PAF and NAF, where PAF is high capacity with NAPP value 88,64 kg H2SO4/ton and pH NAG 2,42 with kinetic test result showen pH 2,18 in acid zone. And for NAF with NAPP value -0,78 kg H2SO4/ton and pH NAG 6,81 with kinetic test result showen pH 7,53 in netral zone.
QUALITY CONTROL KEPADATAN OPTIMUM TIMBUNAN BERDASARKAN FAKTOR DENSITAS DALAM PEMBENTUKAN JALAN PENGANGKUTAN BATUBARA -, SUPANDI
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 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.v8i1.192

Abstract

ABSTRACT Construction hauling road at the swampy area is very difficult due to weak materials and soft material for the basement. The problem can be determinate with approaching density of material during to reach optimum compaction. To determination optimum compaction can be use wet and dry density method and optimum water content. Laboratory testing at the laboratory is conducted on 95% of compaction include moisture content (ASTM D 2216-80), Specific Gravity (ASTM D 854-23), Attenberg Limit (ASTM D 422-63), Liquid Limit (ASTM D 427), compaction (ASTM D 1557). Field testing is required to compare actual value of basic properties of material and laboratory test and also to get correlation number of compaction with thick of layering material. The result of the study is increasing dry density will be give impact reducing void ratio and porosity. Highest density values have been found at the laterite material (coarse) with density number up to 2.18gr/cm3 during wet condition and during dry condition 1.98 gr/cm3. Highest number of wet density fine material about 2.12gr/cm3 and 1.87gr/cm3 for dry density. Lowest number of density for coarse material about 1.82gr/cm3 (wet) and 1.46gr/cm3 (dry) while for fine material about 1.83gr/cm3 (wet) and 1.55gr/cm3. Construction hauling road at the soft material can be conducted using selective material and keep optimum water content and applying compaction layer by layer to reach optimum compaction.
PENGENDALI WAKTU PENYIRAMAN PADA TANAMANHIDROPONIK MENGGUNAKAN IC 555 Watiningsih, Tri; -, Kholistianingsih; Wahjudi, Dodi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 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.v8i1.193

Abstract

ABSTRACT Availability of cropland is the reason why they do not want to plant crops, especially vegetables such as eggplant, cabbage, chilli, as academics eager to implement and introduce hydroponic plants so that the need for hygienic vegetables that can be realized. Along with the question, it is necessary to increase public participation for the introduction in fulfilling the need for vegetables dilahan own more hygienic through Research Lecturer Beginners "Controlling Time Watering On Plant Hidroponik Using IC 555" and utilizes cans or buckets former as cropping media so that it can implement the 3R principles in handling garbage everyday life squad in the smallest scope, Reduce minimize goods, Reuse avoid the use of disposable items, Recycle as much as possible, recycle items that are not useful anymore and converted into other goods. Technology is one of a growing breakthrough developed by the designers of automated tools as a substitute for the operation of a manual system to an automated system, all work will work automatically with an error rate that can be as small as possible. Besides, the technology is expected to automated tools human function as objects or actors on each machine. Average trying to take advantage of the narrow land yard of his house for growing plants that are useful, such as tabulapot plants, to overcome the problem of land is narrow and the provision of water, which is the working principle of the water basin is pumped into the pot plants automatically using IC 555, with the automatic watering tabulapot is expected to overcome the above problems from manual to automatic watering
STUDI PENGENDALIAN KUALITAS PINTU KAYU DENGAN MENGGUNAKAN METODE LEAN SIX SIGMA Sinaga, Tuti Sarma
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 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.v8i1.194

Abstract

This study is about the industry that produces wooden doors for export needs. The problems is the occurrence of defects in the production process and non value-added process. Type of defect commonly found on the wooden door is the assembly, gluing and coloring. This study aims to improve the quality of doors produced by reducing the number of defect products and reduce waste in the production floor. Lean Six Sigma is used to focus on reducing lead time and failure in the production process. Result shows that the main cause of defect products is low skill operators and machine during operation so that the product does not comply with the specified quality, The proposed improvement is to provide job training for operators, machine maintenance plan and make the procedure of operation activity on the Laminating, Glazing and assembly.
ESTIMASI PENYESUAIAN LIKUIDITAS TERHADAP VALUE AT RISK DARI DATA HISTORIS Pratiwi, Noviana
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 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.v8i1.195

Abstract

Risk is often associated with volatility or deviation of investment return, investor required measure of risk to managing risk. Value at Risk (VAR) is a risk measurement techniques and considered the standard method of measuring risk. In portfolio, VaR is defined as the estimated of maximum loss will be experienced by a portfolio at a spesific time period with a certain confidence level. There are three main methods to calculate the VaR i.e. variance-covariance , historical simulation and monte carlo simulation method. Capital market are not perfected liquid, but VaR model is usually asumsed to be liquid market. Whereas liquidity of market should be considered in capital market due to be optimally role in supporting economic growh, the market must be liquid. Incorporation of liquidity risk into VaR model is called Liquidity adjuated Value at Risk (LVaR). In our work, LVaR is estimated for highly liquid and less liquid portfolio.
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.

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