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GEMA TEKNOLOGI

gema_teknologi
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Published by Universitas Diponegoro

ISSN : 08520232 EISSN : 2656582X DOI : -

Core Subject : Science,

Computer Science & IT

Gema Teknologi Journal (pISSN : 0852-0232, eISSN : 2656-582X) is an open access journal published by Vocational School, Diponegoro University, Indonesia. Gema Teknologi publishes articles from various engineering disciplines (the results of original scientific research or new scientific studies of literature). Editor receives articles both in English and Indonesian. Gema Teknologi Journal is published 2 (two) times a year, on April and October.

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Articles 166 Documents

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RANCANG BANGUN EXTERNAL ELECTROMAGNETIC RETARDERS SYSTEM PADA MOTOR 1 PHASA Dewantara, Bima Dicky Anugrah; Manan, Saiful
Gema Teknologi Vol 18, No 4 (2016): October 2015 - April 2016
Publisher : Vocational School Diponegoro University

Bima Dicky Anugrah Dewantara, Saiful Manan, in this paper explain that Electromagnetic retarders are generally known as electromagnetic inhibitors or brakes, the braking system eliminates most braking mechanics, thereby reducing conventional braking systems. Safety requirements and safety systems are developed and become a focal point of an equipment. Electromagnetic brakes are a safety component with a control system that is easy to control. With this electromagnetic brake, it will reduce maintenance costs, because it only requires a factor of electricity to be able to move it. The braking system uses electromagnetic forces to slow down a movement, which is generally a shaft motion. A dish with non-ferromagnetic metal material is attached to a rotating shaft. The disk is flanked by the side of the stator in the form of an electromagnetic coil system that can generate a magnetic field from electricity. Electric current generates a magnetic field in the coil. And the metal plate that cuts the magnetic field will cause eddy currents on the disk itself. This eddy current will generate a magnetic field whose direction is opposite to the previous magnetic field, thus inhibiting the rotary motion of the shaft. In designing, experimenting and making an External Electromagnetic Retarders System Design on 1 Phase Motor, use the NE 555 IC as the control duty cycle. So that the relationship between braking current and braking time is inversely proportional if the higher the current, the shorter the time it takes for the rotor to stop. And the relationship between braking current and motor current is directly proportional, by increasing the braking current will increase the load on the motor causing the motor current to increase.Â Keywords: Electromagnetic Retarders, Electromagnetic Brakes, Eddy Flow EffectReferencesTipler, P. 2008. Physics for Scientist volume 2. New York : WH Freeman and Company..Ishaq, M. 2007. Fisika Dasar Elektisitas dan Magnetisme. Yogyakarta: Graha Ilmu.Millman, Halkias, M.Barmawi, dan M.O.Tjia. 1971. Integrated Electronics:Analog and Digital Circuits and Systems. Jakarta : Erlangga.Ramdhani, Mohamad. 2008. Rangkaian Listrik. Jakarta : Erlangga.Bishop, Owen. 2004. Dasar-Dasar Elektronika. Jakarta : Erlangga.Halliday, David. Robert Resnick. 1978. Fisika Jilid II Edisi Ketiga. Jakarta : Erlangga

FOR WORK / BEKISTING PADA BANGUNAN GEDUNG BERTINGKAT Darma, Budhi
Gema Teknologi Vol 16, No 1 (2010): April 2010 - October 2010
Publisher : Vocational School Diponegoro University

Budhi Dharma, in this paper explain that to get a good concrete structure form, need the existence of making of work form (bekisting) the goodness. In this case accuration, strength and also the supporter structure of having to enough of strength. To facilitate installation and also time efficiency in execution of unloading and installation need a correct and good construction. Keywords:bekesting, structure strength

PENGAMBILAN KEPUTUSAN UNTUK KUALITAS AIR PADA TAMBAK UDANG MENGGUNAKAN FUZZY LOGIC CONTROL Dwisaputra, Indra; Rolastin, Boy; Irwan, Irwan; Sateria, Angga
Gema Teknologi Vol 20, No 3 (2019): April 2019 - October 2019
Publisher : Vocational School Diponegoro University

Indra Dwisaputra, Boy Rolastin, Irwan, Angga Satera, in this paper explain that one commodity that can be used as a superior post-mining area such as Bangka Belitung is shrimp ponds. Touch of technology is needed because of high rainfall in this area so that changes in temperature, humidity, salinity and pH are more dynamic. Then we need a control to determine the water quality in shrimp ponds to avoid crop failure. This research was conducted by means of simulations to make it easier to analyze the results before applying. Fuzzy logic control (FLC) method is used for the water quality decision making system. By utilizing 3 input variables such as temperature, salinity and pH of water and output is an index of water quality from a scale of 0-100. The Mamdani method is applied to FLC with 27 fuzzy rules. The simulation results show that a change in one of the input variables can cause water quality to drop to 70. When there are changes in the two input variables, it can reduce water quality by 25.1. FLC can work well in decision making for water quality in shrimp culture.

DESAIN AIRFOIL MENGGUNAKAN SOFTWARE CAEDIUM Mangestiyono, Wiji
Gema Teknologi Vol 17, No 1 (2012): April 2012 - October 2012
Publisher : Vocational School Diponegoro University

Wiji Mangestiyono, in paper airfoil design use caedium software explain that caedium and its add-ons combine to form an easy-to-use Computational Fluid Dynamics (CFD) software system that can help to assess the performance of Â 3D model. Using Caedium add-ons can create any 2D or 3D geometry or import geometry from another CAD package. Then simulate how a gas (e.g. air) or liquid (e.g. water) will flow over and through Â geometry. Caedium is simple to learn and efficient to use. Every body can study how the physics of its model changes over time or as modify the model in real time. Caedium's unified simulation environment makes it easy to change the model on the fly and quickly see the results of the changes. Keywords : Caedium, Airfoil, Computation Fluid Dynamics

PENGEMBANGAN ADSORBENT BED UNTUK PENINGKATAN KONDUKTIVITAS TERMAL MELALUI PENAMBAHAN PARTIKEL METAL ALUMINIUM Didik Ariwibowo; Sutrisno Sutrisno
Gema Teknologi Vol 17, No 4 (2014): October 2013 - April 2014
Publisher : Vocational School Diponegoro University

Didik Ariwibowo, Sutrisno, in this paper explain that this research is to increase thermal conductivity of a adsorbent bed by adding metal particles in it so that the bed become a granule-mixed bed. The adsorbent bed contains activated-carbon granule and aluminium particles. The research activity include: design and fabrication of adsorbent bed prototype following thermal performance study of the adsorbent bed. The thermal performance study of the adsorbent bed was conducted by varying metal/adsorbent ratio of 5%, 10%, 15% by volume. The result showed that adding 5%, 10%, and 15% aluminium particles into adsorbent bed has increased its thermal conductivity, those are 10,9 Wm-1K-1; 21,9 Wm-1K-1; and 30,9 Wm-1K-1 respectively from 1,6 Wm-1K-1 activated carbon thermal conductivity. The values of experimental thermal conductivity were higher than those of calculated thermal conductivity. The percentage of the difference between experimental thermal conductivity and calculated thermal conductivity decreased as bed surface temperature increased. The relatively higher percentage was in 45% whereas the lower was 10%. The lower range of the difference was 10-20% occurred in 55-65 oC temperature range. Key words: adsorbent bed, metal/adsorbent ratio, thermal conductivity

RANCANG BANGUN PINTU WAHANA OTOMATIS MENGGUNAKAN SENSOR ULTRASONIK HC-SR04 SEBAGAI PENGUKUR TINGGI BADAN DAN SENSOR LOAD CELL DENGAN HX711 SEBAGAI PENGUKUR BERAT BADAN BERBASIS ARDUINO MEGA 2560 Lutfiyanto, Agung Hanifan; Subari, Arkhan
Gema Teknologi Vol 19, No 2 (2017): October 2016 - April 2017
Publisher : Vocational School Diponegoro University

Agung Hanifan Lutfiyanto, Arkhan Subari, in this paper explain that at present, profit plyaground still uses manual measurement to select visitors who will enter the vehicle. Measuring just selecting one's height by putting aside weight can have a negative impact on the smoothness and safety of the playing area. Therefore, an automation is needed to measure body weight and height to be safer from game accidents and increase vehicle life to avoid damage. This design makes the device an automatic vehicle area entrance system using Arduino Mega 2560 for the main controller system supported by various sensors namely HC-SR04 ultrasonic sensor as a measure of prospective visitor height, 100 Kg Load Cell sensor as a measure of prospective visitor's weight and motor servo as the opening and closing door of the vehicle. When prospective visitors will enter the vehicle, prospective visitors stand on their height and weight gauges. Furthermore, Arduino compares with the standard height and weight previously set. If the weight and height are in accordance with the standard, the door will open automatically and visitors can enter the vehicle. For testing the prospective visitor's height as measured by the HC-SR04 ultrasonic sensor has an average error ratio of 1.01%, while testing prospective visitor's weight measured by sensor Load Cell has an average error ratio of 2.90% and is calculated quite accurate.

DAMPAK PEMBANGUNAN PLTN TERHADAP PERUBAHAN TATA RUANG KABUPATEN JEPARA Setia Budi, Bambang
Gema Teknologi Vol 16, No 1 (2010): April 2010 - October 2010
Publisher : Vocational School Diponegoro University

Bambang Setiabudi, in paper Study on effect of the NPP development toward spatial planning at District of Jepara had been done to support government policy according to governmental rule No. 5, Year of 2006 concerning National Energy Policy which nuclear energy is chosen as one of alternative energy source. The study was done by estimating growth of resident naturally with geometric method, increase of constructing labor pursuant to requirement of standard, and growth of resident as impact of economics growth and then to predict the land use change due to facilities requirement. Research result indicates that change of space pattern of non-agriculture settlement is equal to 15%. It also shows that growth of resident density rises to level of 31-45 person per ha.Keywords : spatial planning, geometric, input-output analysis, policy

DESKRIPSI TEKNIS PENGENDALI TINGGI MUKA CAIRAN INDUSTRI METODE FLOATLESS OMRON 61F Tadeus, Dista Yoel; Setiono, Iman
Gema Teknologi Vol 20, No 2 (2019): October 2018 - April 2019
Publisher : Vocational School Diponegoro University

Device for controlling liquid/water level using the floatless method uses the character of liquid conductivity as an electric current carrying medium. Excitation voltage is generated by the controller and passed to the electrode through an insulated conductor cable. The electrode is submerged in a tank or liquid storage vessel and directly becomes the lower limit and upper limit of the liquid level. Omron 61F is one of the industry-standard floatless control devices that is simple, compact and relatively inexpensive and easily available on the market. Some applications for controlling liquid levels such as water supply and drainage can be done easily and simple wiring. Omron 61F provides a variety of controller types that are tailored to the application conditions and the type of liquid used, ranging from purified clean water, dirty water, salt water, to several types of acidic liquids.

SISTEM PENYIRAMAN TANAMAN ANGGREK MENGGUNAKAN SENSOR KELEMBABAN DENGAN PROGRAM BORLAND DELPHI 7 BERBASIS MODUL ARDUINO UNO R3 Widhi, Happy Nugrahaning; Winarno, Heru
Gema Teknologi Vol 18, No 1 (2014): April 2014 - October 2014
Publisher : Vocational School Diponegoro University

Happy Nugrahaning Widhi, Heru Winarno, in paper orchid plant watering system using humidity sensor used Borland Delphi 7 based on arduino uno R3 explain that the utilization of variable moisture for plant watering orchids do not fully utilized. At this time watering orchids is still done manually. It certainly took a lot of time, by making a watering system based on this moisture will save time. To determine the value of temperature and humidity used SHT-11 module is capable of detecting the temperature from -40C to 123,8ËšC and relative humidity from 0% RH to 100% RH. Watering plants Phalaenopsis amabilis orchids species do when the SHT-11 detects the humidity inside the orchids house below 60% RH. Watering is carried out by spraying water from above directly into the plantâ€™s roots. The method of watering is intended that the water can be poured directly absorbed by the plant. This control system controlled by arduino uno microcontroller. As for the computer control system, used Borland Delphi 7 to make aplication for control. So this watering system is divided into two they are automated systems and control through computer system Keywords: Module SHT-11, Arduino UNO, Borland Delphi 7.

HUBUNGAN ANTARA MATA KULIAH FISIKA TERAPAN DALAM KONTRIBUSINYA TERHADAP MATA KULIAH KEAHLIAN PADA MAHASISWA PROGRAM DIPLOMA III TEKNIK ELEKTRO SEKOLAH VOKASI UNIVERSITAS DIPONEGORO Setiono, Iman; Tadeus, Dista Yoel
Gema Teknologi Vol 20, No 1 (2018): April 2018 - October 2018
Publisher : Vocational School Diponegoro University

Iman Setiono, Dista Yoel Tadeus, in this paper explain that physics is a branch of behavior and experimental studies. In studying the nature, physics uses mathematical language to model natural phenomena in a mathematical context. In physics research, mathematical abilities are needed as studentâ€™s initial abilities in solving Physics problems. This study aims to study the relationship between courses in applied physics and courses that are the basis of developing competencies. The method used is the method of documentation and analysis using quantitative descriptive. The object of this study was students for physics subjects from student learning outcomes of student KHS grades. The results obtained from an integrated analysis provide strong results between learning outcomes and the ability of other subjects.

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