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Published by Institut Sains dan Teknologi AKPRIND

ISSN : 19798415 EISSN : - DOI : -

Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Search results for , issue "Technoscientia Vol 11 No 2 Februari 2019" : 14 Documents clear

PENGARUH KECEPATAN LAS MIG MATERIAL AA5083H116 PADA LAJU KOROSI DI LINGKUNGAN 3.5% NaCl -, Mudjijana
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Transportation equipment of product and people from one island to another using a small or large ship is cheaper than by plane. The ship can be constructed using A36 steel materials and AA5xxx aluminum alloys that are resistant to saline water. The purpose of this research is to investigate the effect of MIG welding speed of AA5083H116 on corrosion rate in a 3.5 wt% NaCl environment. AA5083H116 material of 300mm x 75mm x 3 mm was welded using a MIG Tenjima 200s equipment and using ER5356 electrode of 0.8 mm diameter, at welding speed of 8, 10, 12 mm/s, filler rate of 27 mm/s, and in argon gas environmental. The specimen of 15 mm diameter and 2 mm thick was let to be corroded including the base metal (BM), heat affected zone (HAZ), and weld metal zone. The corrosion testing was carried out at BATAN Serpong using a three-cell potensiodynamic polarization electrode. The results of Tafel plot was showed a corrosion current (icorr) and corrosion voltage (Ecorr), then corrosion rate can be determined. The corroded specimen surfaces were investigated using a scanning electron microscope (SEM) and an energy dispersive spectrometer (EDS). The results of the research show that the corrosion rate of welding speed of 12 mm/s is lower than that of welding speed of 8 mm/s. It is confirmed that the SEM showed that the deterioration of surfaces corrosion is smaller than at HAZ zone.

PENGARUH PENAMBAHAN PLASTIK POLIPROPILENA TERHADAP YIELD DAN KUALITAS MINYAK NABATI HASIL PIROLISIS BONGGOL JAGUNG YANG MENGGUNAKAN CO2 SEBAGAI GAS PEMBAWA Edgar, Justin; Supramono, Dijan
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Indonesia has potential sources for development of renewable fuels from agricultural wastes, one of which is corn cobs. Many researches have tried to convert corn cobs into a liquid fuel by pyrolysis, but the resulting bio-oil has a high oxygenate content, resulting in a low heating value. On the other hand, plastic waste has become a major problem for Indonesia, amounting to 5,4 million tons of waste per year. Around 16% of the total plastic waste is polypropylene, in which its high hydrogen/carbon ratio is an attractive hydrogen source for co-feeding with corn cobs in co-pyrolysis. Synergetic effect has been formed between the two, which has been proven to increase the yield and quality of the resulting bio-oil. Most co-pyrolysis process has been conducted with nitrogen as carrier gas. Its high price creates an economic barrier for commercial production of bio-fuel using co-pyrolysis method. It is proposed to substitute nitrogen with carbon dioxide. Beside of its low cost, carbon dioxide is known to have a heat-trapping effect, thus increasing the heat flux to particle feed during co-pyrolysis process. Three feed compositions during the process has been investigated to observe the effect of feed composition to the yield and quality of the non-polar (non-oxygenated) fraction of resulting bio-oil, which will be compared to commercial gasoline. Co-pyrolysis process was conducted in a stirred tank reactor with low heating rate of 5oC/min, maximum temperature of 500oC. Non-polar fraction of the resulting bio-oil has been characterized using GC-MS (gas chromatography-mass spectroscopy) and H-NMR (hydrogen-nuclear magnetic resonance). Bio-oil yield is lower compared to its counterpart when nitrogen is used as carrier gas, but H-NMR results shows that the non-polar fraction have a high branching index, low alkene and aromatic contents, which is potential to be used as a bio-fuel.

STUDI EKSPERIMEN PENGARUH POROSITY RATIO PADA PERFORATED TWISTED TAPE INSERT TERHADAP KARAKTERISTIK HEAT TRANSFER DAN FRICTION FACTOR PADA PENUKAR KALOR PIPA GANDA Puspitasari, Susi; Safitra, Arrad Ghani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Heat exchanger is used device to transfer thermal energy (enthalpy) between two or more fluids at different temperatures. One type of heat exchanger is double pipe heat exchanger. Double pipe heat exchanger consists of one pipe placed concentrically in another pipe with a larger diameter. One fluid passes through the inner pipe and the other fluid passes through the outer pipe (annulus). Performance of double pipe heat exchangers can be determined based on the characteristics of heat transfer and friction factor. One effort to improve the performance of double pipe heat exchanger can by passive method which is adding perforated twisted tape in the inner pipe. Perforated twisted tape had three different porosity ratios, that is 1.88, 3.77, and 5.65% that comparison with plain twisted tape (porosity ratio 0). Fluid flowed in double pipe heat exchanger is water in liquid phase in laminar-transition flow regime. Reynolds number in annulus is made constant at 2000, while in inner pipe is 1000-5000. Temperature of water entering annulus and inner pipe is kept constant at 20ÂºC and 50ÂºC, respectively. From the experimental results it found that perforated twisted tape increased Nusselt number and friction factor values respectively 0.1-0.8% and 203-1536% higher than double pipe heat exchanger without twisted tape (plain tube). Perforated twisted tape with porosity ratio 3.77% has the best performance, that is increasing Nusselt number average of 0.31% from 28.8913 in plain tube to 28.9810 and increasing friction factor average of 366.34% from 0.6521 in plain tube to 3.0410.

KARAKTERISASI SIFAT OPTIK C-DOTS DARI KULIT LUAR SINGKONG MENGGUNAKAN TEKNIK MICROWAVE Putro, Permono Adi; Roza, Liszulfah; -, Isnaeni
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Carbon dots (C-dots) are a new type of phosphorescent nanoparticles that can be easily synthesized from natural sources or raw materials. The outer shell of cassava is the second waste obtained from cassava skin waste which is less attention to be utilized. Synthesis of C-dots from the outer shell of dried cassava has been successfully carried out with Microwave techniques. Synthesis of C-dots was carried out using water as a solvent with a variation of the concentration of precursor solutions to the microwave duration. Microwave duration causes changes in the structure and optical properties of C-dots. C-dots are characterized to study the optical properties of the UV-Vis absorbance spectrum and emission intensity in the form of emissions. The observed optical properties aim to determine the C-dots energy transition, such as surface and core energy. The core energy level becomes dominant in the transition Ï€â†’Ï€* compared to the transition of nâ†’Ï€* in surface energy when the C-dots concentration increases so that energy shifts. This phenomenon is known from the top of the broad C-dots emission spectrum and shifts to longer wavelengths. In addition, we suspect that the difference in C-dots emissions is caused by the molecular density and content of the preparation based on the concentration of precursor solutions and the length of microwave time.

MODEL PREDIKSI PERUBAHAN PENGGUNAAN LAHAN DENGAN PENDEKATAN SISTEM INFORMASI GEOGRAFIS DAN CELLULAR AUTOMATA MARKOV CHAIN: STUDI KASUS KABUPATEN ROKAN HULU, PROVINSI RIAU Fitriyanto, Bobby Rachmat; Helmi, Muhammad; -, Hadiyanto
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Rokan Hulu Regency, Riau Province, is one of the largest oil palm plantation centers in Indonesia. The large growth of palm oil plantations in recent years has threatened the existence of protected areas and increased deforestation rates. This study aims to (1) find out the extent of land use change in Rokan Hulu Regency in 2000-2012, (2) predict land use change in Rokan Hulu regency by 2030. This research uses Geographic Information System approach with prediction model of Cellular Automata (CA) Markov Chain. The driving factors of land use change as input of CA Markov Chain model consist of distance to road, distance to river, distance to disturbance area, distance to Plantation Forest, distance to Forest Clearance Permits and slope data. The results showed that the area of deforestation reached 60.38% from 2000 to 2012, mostly in the northeastern region of Rokan Hulu Regency. The prediction model of land use change has an accuracy of 68.15% based on the kappa index agreement (KIA). By 2030, the area of forest land in Rokan Hulu is predicted to be 3.13%

MODEL SISTEM INFORMASI MANAJEMEN KETAHANAN PANGAN (PEMANFAATAN DAN KETERSEDIAAN PANGAN) -, Zaidir; -, Erizal
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The concept of food security considers the availability of food, access to food and the use of food as the main aspects supporting food security and linking these aspects to ownership of household assets, livelihood strategies, and political, social, institutional and economic environments. In Law Number 18 of 2012 it is said that the Government and Regional Government are obliged to develop, compile and develop a food information system on aspects of food utilization and availability. The benefits of information have a significant impact on an institution or the public. Quality information can only be produced from a quality information system. Data and information are needed as a basis for policy making and decisions from planning to evaluating activities. The model development method in this study is with the stages of analysis, design and coding and model testing. The results of this study are a model of the Food Security Information System that can provide information on food security analysis with various variations. Indicators of achievement in the study are in the form of design use case diagrams, database design and interface design.

RANCANGAN DAN IMPLEMENTASI SISTEM PENGARSIPAN DIGITAL BERBASIS WEB SEBAGAI DATA PENDUKUNG DALAM AKREDITASI PROGRAM STUDI (Studi Kasus: Fakultas Sains & Teknologi Universitas Respati Yogyakarta) Sahal, Ahmad; Aini, Farida Nur
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The rapid development of science and technology can cover all aspects of life, including writing and writing, and can also store data in digital form in the form of storage media in the form of hard disks or the like. Besides that, it can also be found in a data storage system using a database system, which in this storage system makes it easy to get stored data whenever needed. The application developer scheme used for digital processing, uses the Rapid Application Development (RAD) method. Create a prototype built with Computer Aided Software Engineering (CASE) that allows, creates data models, converts data models to databases, and codes in one device, but will remain at this stage. From this study are the results of the design used to create digital archives, for the process of Digital Archive Implementation is in the process of completion. It is expected that there will be a process of implementing the Archive Elimination Process in the Study Program at the Faculty of Medicine and Technology at Respati University in Yogyakarta.

TEKNIK WATERMARKING MENGGUNAKAN METODE CRT PADA DETEKSI TEPI CANNY UNTUK PERLINDUNGAN HAK CIPTA (DAGADU) Herawati, Nuniek
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Yogyakarta merupakan salah satu kota tujuan wisata favorit di Indonesia. Hampir setiap akhir pekan atau liburan Kota Gudeg ini selalu dipadati oleh wisatawan baik lokal maupun manca negara dari anak-anak, remaja sampai orang dewasa. Pada kota pariwisata khususnya, ketersediaan cinderamata dan oleh-oleh memegang peran penting untuk menambah income daerah dan sudah pasti mempunyai kekhasan. Kota Yogyakarta tak hanya terkenal dengan oleh-olehnya yang berupa gudeg, batik dan bakpia saja, namun juga dikenal dengan brand fashion Dagadu. Dagadu merupakan sebuah merek dagang khas Yogyakarta berupa rancangan grafis yang dibuat pada cinderamata terutama kaos, baju, gantungan kunci, stiker dan lain-lain. Rancangan grafis dimana menghasilkan citra bisa dijaga dari manipulasi citra agar tidak bisa ditiru oleh pihak lain. Skema watermarking dibuat untuk mengatasi hal ini. Teknik watermarking merupakan salah satu solusi menghindari penyalinan yang tidak legal. Saat ini banyak skema watermarking yang telah diajukan untuk mengatasi masalah ini. Tujuan dari penelitian ini adalah menerapkan teknik watermarking Chinese Remainder Theorem (CRT) untuk pelabelan hak cipta. Sebelum dilakukan penanaman watermark, dilakukan proses preprocessing terlebih dahulu menggunakan metode deteksi tepi Canny untuk mengetahui tepi dan batas-batas pada citra. Hasil pengukuran kualitas citra menggunakan Structural Similarity (SSIM), terlihat metode CRT pada deteksi tepi Canny mampu meningkatkan kualitas citra watermark secara signifikan dengan rata-rata 0.99963 dibandingkan dengan metode CRT yang hanya memiliki rata-rata 0.99842. Pada saat diberi serangan pengolahan citra, CRT pada deteksi tepi Canny mampu mempertahankan robustness terhadap serangan dengan rata-rata kompresi 0,68212 dan noise 0.940038 sedangkan metode CRT hanya memiliki rata-rata kompresi 0,56653 dan noise 0.93632.

PERBANDINGAN KUALITAS CITRA PADA TIGA SOFTWARE VIDEO -, Harmastuti; Setyowati, Dwi; Prasetyo, Panggih Cahyo; Widhiatmoko, Mahendra Kurnia
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The development of information technology is currently very rapid, can be seen in the real world how important the use of video, such as in the field of advertising, entertainment, business and no less important in the field of education for the delivery of learning information which all require a clear and attractive display. In this study, we will examine a comparison of three video software on image quality, image sharpness, brightness and audio effects in Windows Live Movie Maker, VideoSpin and Movavi Video. The research conducted made the video using the three software on the NTSC video format, AVI file type, resolution (720x480), 4:3 Pixel ratio, Standard D1 aspect ratio (0.09), 1500 kbps bit rate, 29.97fps frame rate with Audio: Stereo Channels, 48,000 HZ sample rate, 2.2 minutes duration. The samples were taken by the HMJ activities (HIMAKOM), namely graphic science competitions, sports, the introduction of new software training students, data used by static photos. For testing, questionnaires were collected on 43 respondents, students, majoring in Computer Systems and Statistics to assess the results of the video from the three video software and then tested with Anova to find out which one was better. From the results of the calculation of respondents' data, the average respondents liked the Movavi Video software with an image quality value of 89.2, sharpness of images 88.103, audio effects 83.333 and after being tested using Anova software Movavi Video analysis was better. It was concluded in this study that Movavi Video software could be a consideration to choose from in making videos.

RANCANG BANGUN SISTEM MONITORING SUHU DAN KELEMBABAN PADA RUANG SERVER BERBASIS IoT (INTERNET OF THINGS) Santoso, Gatot; Kristiyana, Samuel; Hani, Slamet; Mujahidin, Achmad Miradani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Room server is a room that is used to store server computers and network devices. Room server is important assets for companies or institutions that implement information technology as a support in their daily activities. The importance of that is because in the server room there are applications and databases that store all important and valuable information for the company or institution concerned, therefore the server room must always be in good condition. Design of temperature and humidity monitoring systemsis designed to detect changes in temperature and humidity in the room using ESP8266 Node MCU as the main control, then use DHT 11 as a temperature and humidity detection sensor, then the data will be sent to the Telegram application already installed on the smartphone and displayed in the LCD. If the MQ-2 gas sensor detects a smoke greater than 500 ppm, the buzzer active. With this tool, it is expected to be able to monitor the real time room temperature and humidity in the server room so that it can reduce the damage to the hard drive or other damage.

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