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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.

Arjuna Subject : -

Articles 166 Documents

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DAMPAK PELAYARAN KAPAL LAUT DI ALUR SUNGAI MUSI Sugeng, Sunarso
Gema Teknologi Vol 16, No 1 (2010): April 2010 - October 2010
Publisher : Vocational School Diponegoro University

Sunarso Sugeng, in this paper explain that the effect of movement of ship in Musi River cause environmental damage in the form of path exterior erosion / wall step aside river,effect from this material erosion result the happening of accelerateing sedimentation which enough quickly so that degrade energy support sea transport path and for the conservancy of groove this sea transport require dredging fund which do not lessen fastly of this sedimentation one of the way of is to make regulation demarcation speed of sea transport to ship have certain dimension .. To lessen erosion effect movement of other causes and boat, earn is also considered to regarding strong effort of bank groove by protecting it with bagwark, revetment etcetera as according to principle engineer river Key word Sungai musi

SIMULASI PELIMPAHAN BEBAN SISTEM PMT KOPEL TO KOPEL PADA SAAT PEMELIHARAAN TRAFO BERBASIS ARDUINO MEGA 2560 MENGGUNAKAN VT SCADA 11.2 Samputro, Muhammad Rizki; Subari, Arkhan
Gema Teknologi Vol 20, No 3 (2019): April 2019 - October 2019
Publisher : Vocational School Diponegoro University

Mochammad Rizki Samputro, Arkhan Subari in this paper explains that the need for electricity in everyday life demands PT. PLN to always maintain the distribution of electrical energy to customers. Therefore, it is necessary to use a strategy to prevent blackouts if the transformer is being maintained, that is by maneuvering the load through the network or by using a 20 KV coupling system. The 20 KV Coupling System consists of PMT Kopel Transformer 1 and PMT Kopel Transformer 2 or often called PMT Kopel to Kopel. In this research, a Kopel to Kopel PMT simulation tool is used to transfer transformer loads during maintenance using a LY2N DPDT 12 V relay, ZMCT103C current transformer sensor, voltage sensor, tap changer and use Arduino Mega 2560 as a delivery choice change. After the experiment, the total current size of transformer 1 and transformer 2 exceeds the capacity of transformer which is 4.29 A and the voltage difference is 0.71 V (5.9 %). Therefore it is necessary to adjust the current and voltage regulation so that it becomes 2.82 A and 0.06 V (0.5 %). After that the transfer of load Transformer 2 to Transformer 1 using PMT Kopel to Kopel can be done. The load transfer is done by entering the PMT Kopel 1 and PMT Kopel 2 simultaneously and the Incoming 2 PMT is released. For the normalization, PMT Incoming 2 is entered and PMT Kopel 1 and Kopel 2 are released simultaneously.

PEMBUATAN PROTOTIPE PENGERING BATUBARA UNTUK MENGURANGI MOISTURE CONTENT PADA PLTU Mangestiono, Wiji
Gema Teknologi Vol 18, No 1 (2014): April 2014 - October 2014
Publisher : Vocational School Diponegoro University

Wiji Mangestiono, in paper prototype development of coal dryer to reduce moisture content on power plant explain that the percentage of coal use in the power industry in Indonesia has increased during the period of the last ten years. This policy is taken by the government by at least two considerations, namely: the higher world oil prices so that the price of electricity per kwh increase in addition Indonesia itself is the world's largest coal producer with serial number to six so that the transfer of fuel oil to the coal is considered very right. There is a fundamental problem that must be observed that coal mining in Indonesia in general have a low- rank quality with sub - categories butuminus and lignite which has a low calorific value (below 6100 kcal / kg ) and moisture content (moisture content) relatively high (40%). This is exacerbated by the way the coal deposit which is usually placed on the page (coal yard). Low-rank coal with pores relatively greater will more easily absorb water during the rainy season so that the moisture content will be even greater. The use of coal in Rembang reached 1.3 million tons / year. Heat loss due to the use of coal with a high moisture content reaches 300 billion kcal per year or equivalent to coal with a calorific value of 50 thousand tons or the equivalent of cash also 30 billion rupiah. After observing the phenomenon in Rembang the researchers plan to create a prototype coal heaters with a capacity of 100 kg / hour in the hope of getting a concept to eliminate or minimize heat loss as described. Heating devices planned screw -shaped drum with a player in it which serves stirring granulated coal. The hot air is taken from the flue gas is sprayed into the drum. The independent variable of this study is the screw rotational speed and the speed and temperature of the hot air flow. Coal is expected after discharge from the dryer may have a water content below 10 % as high quality coal (anthrasit). Keyword : coal, moisture content, dryers

STUDI KUAT TEKAN BETON DENGAN AGREGAT KASAR DARI BATU KAPUR Hartono, Hartono
Gema Teknologi Vol 17, No 3 (2013): April 2013 -October 2013
Publisher : Vocational School Diponegoro University

Hartono, in this paper explain that to obtain the allowed characteristic compressive strength of concrete from a concrete construction is quite difficult , because it is influenced by the mix of materials used for the manufacture of the construction, in which the require material of the concrete mix had to be in accordance with Reinforced Concrete Indonesia Rule Year 1991.Â The main factor of mix material that affect permitted the compressive strength of concrete is aggregate characteristics, namely the coarse aggregate or crushed stone. Therefore this study is intended to determine the compressive strength of concrete with the characteristics of coarse aggregate material of crushed stone that comes from limestone. This research use Gresik PC mixture concrete, muntilan sand, and kricak of limestone. To determine concrete compressive characteristics strength of concrete, concrete specimen as many as 20 pieces, with mixed-use PC weight ratio of 1 : 2 Ps : 3, cube molded kricak with the size of 15 cm X 15 cm X 15 cm was made. From these results, it can be obtained that concrete compressive characteristic strength Ïƒ 1 bk = 215.41 kg / cm2. Keyword: Concrete construction

SISTEM MONITORING VOLUME AIR MENGGUNAKAN SENSOR ULTRASONIK DAN MONITORING OUTPUT VOLUME AIR MENGGUNAKAN FLOW METER BERBASIS ARDUINO Br Pelawi, Servinta Damayanti; Manan, Saiful
Gema Teknologi Vol 19, No 2 (2017): October 2016 - April 2017
Publisher : Vocational School Diponegoro University

Servinta Damayanti Br Pelawi,Saiful Manan, in this paper explain that method of realization of making purification and monitoring volume of water, purification of water using small molecules such as sand, charcoal, cotton, etc. and monitoring the volume of water using the HC-SR04 ultrasonic sensor. where this ultrasonic sensor will detect the water inside the sensor distance sensor to objects that is 2cm and 25cm. When the water has reached the limit of 2cm and 15cm then the buzzer will light up giving a warning. and will display on the HMI in the form of cm, to run the pump we click the start button at hmi the pump will turn on and the water inside the reservoir will enter reverse osmosis, Ro will process water, clean water will be read by the flow meter, flow meter will detect incoming water and will display the results in the HMI in the form liter, and Arduino UNO is used as a control system for HMI output input signals, sensors, flow meters, and buzzers.

PEMBANGUNAN PEMBANGKIT LISTRIK TENAGA PANAS BUMI / GOETHERMAL ENERGY ( PLTPB ) Moediyono, Moediyono
Gema Teknologi Vol 16, No 1 (2010): April 2010 - October 2010
Publisher : Vocational School Diponegoro University

Moediyono, in paper development of electrical generator from geothermal energy explain that the growth of electric need which rapidly, where as the price of BBM more increasingly, so on several years can worry about the electric generator which have now, especially which using the fuel fossil can not fulfill he need of electric stock on consumen Then, it need reconstruction the electric generator whic will suitable with government wisdom in energy seetor with be hrifly on using of BBM, and remembered the back up of BBM in Indonesia which had more thin. One of alternative energi resorces which can used is geothermal that many in Indonesia broad. Geothermal energi electric generator have several superiorrty compare with electric generator another, among other does not reed the oil material, easy towalk with environment and also have operational time that relative more than long and does not influence the weather. Keyword: geothermal energy, generator, PLTB

PENINGKATAN KINERJA SISTEM PROPULSI KAPAL PENANGKAP IKAN TRADISIONAL TYPE PURSEINE 30 SD 90 GT MENGGUNAKAN SISTIM PROPULSI HYBRID Ridwan, Mohd
Gema Teknologi Vol 16, No 2 (2011): October 2010 - April 2011
Publisher : Vocational School Diponegoro University

Mohd Ridwan, in this paper explain that traditional fishing vessels built in the shipyard of the people is a cultural heritage which needs to be conserved, and empowered through the application of ship science and technology to build fishing boats for fishermen of all types, shapes and sizes of ships, equipped with fishing technology. Repairs to the feasibility of traditional fishing vessels to sail like stability, ship construction needs to be done. Similarly, his case should be applied to ship propulsion technology that remained operational needs based on size of vessel forms and types of fishing vessels. The design of an appropriate propulsion can provide benefits in the form of operational cost savings by more than 10% through the use of hybrid propulsion systems. Hybrid propulsion system is a mix of main engine (motor fuel or gas fuel MDO) with electric motor and propeller to suit the use of hull form and ship propulsion systems (matching the propeller and engine) is at the core of this concept in this article and next to be research. Besides these traditional ship the product to be supported primarily by imposing government standards for a fishing vessel, for fishermen as users can easily calculate the economic value of investment will they planted in fishing effort at sea.Â Keywords : Fishing Boat Traditional, Hybrid Propulsion, Main Engine, Propeller, Operatinal Cost.

MENGGAGAS SUATU KAWASAN INDUSTRI Sutanto, Sutanto
Gema Teknologi Vol 16, No 4 (2012): October 2011 - April 2012
Publisher : Vocational School Diponegoro University

Sutanto, in this paper explain that industrial area is the area where the concentration of industrial activities whose existence the ideal should be integrated with other areas such as residential, office, education, economic activity and other agricultural green belt - the other. This industrial area should be equipped with infrastructure and other support facilities so as to serve the upstream to downstream processes. The necessary infrastructure and facilities such as office managers, environmental facilities, the network - a network of roads, electricity, telecommunications, sewage, water, fire and reforestation. For industrial buildings must meet the requirements of building height, building area coefficient referring to the City Master Plan. Keywords: city master plan

PEMBUATAN CREAM DETERGENT UNTUK MENINGKATKAN KETRAMPILAN IBU-IBU PKK Kusumayanti, Heny; Budiyono, Budiyono; Dwimawanti, Ida Hayu; Yesiana, Reny; Purwanto, Agus; Subari, Arkhan
Gema Teknologi Vol 19, No 4 (2018): October 2017 - April 2018
Publisher : Vocational School Diponegoro University

Cream detergent is often used in everyday life, serves to wash and clean the dirt (fat). In order to commemorate the day of kartini in 2018, held a training on making cream detergent in Kp. Krapyak RT 07 RW 11 Bintoro Demak. The pH cream detergent generated from this training is 11, this is in accordance with SNI 0062: 2016, where the pH max cream detergent is 11. The purpose of this devotion provides the transfer of science and technology appropriately to the mother of PKK and also to provide skills and entrepreneurship to PKK mothers.

OTOMATISASI PENGATUR SUHU DAN WAKTU PADA PENYANGRAI KOPI ( ROASTER COFFEE ) BERBASIS ATMEGA 16 PADA TAMPILAN LCD ( LIQUID CRYSTAL DISPLAY ) Ristiawan, Masde; Ariyanto, Eko
Gema Teknologi Vol 19, No 1 (2016): April 2016 - October 2016
Publisher : Vocational School Diponegoro University

Masde Ristiawan, Eko Ariyanto Roasting is one of the most important processes in processing coffee beans. So it takes an automatic coffee roaster machine that can support the home roasting process. Basically, this coffee roaster is a heating device, the temperature is regulated following the input setpoint. The heating process is produced by electric heating elements which are controlled by the relay. The temperature sensor used is K type MAXX 6675 Thermocouple. The minimum system of ATmega 16 is used as the overall system control, Users can monitor temperature values and timers, which are displayed via the LCD display. In roasting coffee, roasting weight and temperature are very influential in the length of roasting time. Maximum capacity of 350 gram coffee roasters. To roast coffee with a weight of 100 grams at a temperature of 100 Â° C it takes 34 minutes for light maturity and a temperature of 130 Â° C with the same weight takes 18 minutes.Â Keywords : Thermocouple, Relay, Temperature, Sistem Minimum ATmega 16, LCD, Roaster Coffee.ReferencesSutanto, N. (2012). Rancang Bangun Coffee Producting Machine. Surabaya: Universitas Wijaya Putra.Wijaya, A. (2011). Rancang Bangun Alat Pemanas dan Pengaduk Terintergrasi dengan Temperatur dan Kecepatan Terkendali Berbasis Mikrokontroler. Depok : Universitas Indonesia.Perdana, Y. (2012). Rancang Bangun Alat Penyangrai Kacang Tanah dengan Penggerak Motor DC Berbasis Mikrokontroler AT89s51. Jakarta: Universitas Negeri Jakarta.Kurniawan, R. (2014). Sistem Pengendalian Suhu Menggunakan Metode Fuzzy Logic Pada Tungku Mesin Penyangrai Kopi. Jember : Universitas Jember.Amiq, B. (2015). Rancang Bangun Alat Penyangrai Kopi Semi Otomatis dengan Kapasitas 5Kg. Surabaya: Universitas Negeri Surabaya.Hartanto, S. (2012). Prototipe Pintu Bendungan Otomatis Berbasis Mikrokontroler ATmega 16. Yogyakarta: Universitas Negeri Yogyakarta.Kholatingulloh, T. (2015). Otomatisasi Pengatur Suhu dan Waktu Pada Oven Listrik Berbasis arduino yang ditampilkan pada LCD. Semarang: Universitas Diponegoro.

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