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INDONESIA
GEMA TEKNOLOGI
Published by Universitas Diponegoro
ISSN : 08520232     EISSN : 2656582X     DOI : -
Core Subject : Science,
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 7 Documents
Search results for , issue " Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013" : 7 Documents clear
PEMBUATAN PULP DENGAN MEMANFAATKAN LIMBAH KULIT DURIAN (DURIO ZIBETHINUS MURR) DENGAN CAMPURAN (RESINA COLOPHONIUM) GUNA MENCEGAH DEGRADASI LINGKUNGAN Kurniawan W, Deddy Kurniawan W; Arifan, Fahmi; Adim, M. Dwi Khoirun
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

Deddy Kurniawan W, Fahmi Arifan, M. Dwi Khoirun Adim, in this article explain that paper is one of the primary needs for humans today . High paper usage is resulting increased in production of paper . On the other hand, paper which are usually made ​​from cellulose and hemi-cellulose in wood can result environmental degradation , due to the use of wood and tree felling leads to long-term basis that can increase the temperature of the earth surface ( global warming) . Durian is relatively abundant in Indonesia , durian shell contains high cellulose ( 50-60 % ) and lignin content ( 5 %), also  a low starch content ( 5 % ) . Durian shell wastes containing fibre  with dimensions of length and fiber thick wall that be able to bind well when given a synthetic adhesive or an adhesive mineral . Pulp which is produced from durian shell waste in experiments were 1 , 2 , 3 and 4, have a value of α - cellulose content of 35 % , 45 % , 27.7 % , 37.5 % and 57.6 %, respectively. When yield value of  49.2 % , 66.8 % and 48.2 % respectively. Keywords: pulp, durian, gondorukem, digester
ACR (AUTOMATIC CONTROL ROBOT) BERBASIS ATMEGA 8535 SEBAGAI APLIKASI MODEL ROBOT MENGGUNAKAN REL Setiawan, Arif; Subali, Subali
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

Arif Setiawan, Subali, in this paper explain that a fixed rail track used as a railway line. Application of rail as a direct path not only to train. However, there are also robots that use rail movement path. Rail crossings are used as the robot is not made of steel, but a line. This robot uses a single rail line is black with a white stripe background of a width adapted to the sensor mounted on the robot. Photodiode sensor lines will be detected, and then transmitted to the microcontroller 8535 as the brain or the source of the instruction that has been programmed. 8535 will detect the sensor output and then process the data received to proceed to the Driver that is connected to the DC motor. The output of the microcontroller 8535 will also be displayed through the LCD as the display position of the sensor and input characters. As an added speed control robot 4x1 keypad which will give instruction in the form of characters into the Microcontroller. Keywords: Rail, Sensor Photodiode, Microcontroller 8535, DC Motor Driver, LCD, Keypad, DC Motor.
SIMULASI SISTEM PENGHITUNG JUMLAH MOBIL KELUAR DAN PENGHITUNGAN TARIFNYA BERDASARKAN LAMA WAKTU PADA GEDUNG PARKIR MOBIL BERLANTAI TIGA BERBASIS MIKROKONTROLER ATMEGA 8535 Ary M, Ruky Sandra; Manan, Saiful
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

Ruky Sandra Ary M, Saiful Manan, in this paper explain that parking lot which is widely used today do not present an empty parking location data, causing the vehicle entering the parking area must first find an empty parking space. This led to queues of vehicles becomes unavoidable. Even vehicles must berputarputar first to find an empty parking space. Therefore, it needs a parking system that can alert parking block capacity is still empty. Parking tariff determination system also plays an important role, most of the park determines the rate only on the type of vehicle rather than on how much time parking felt unjust for some people. This study designed a microcontroller-based parking system that can determine the number of cars remaining at the same time counting parking rates is a unified tool that can be divided into two, namely, hardware and software as a mechanical system that will work as a control system and the process of calculating tariffs. Keywords: parking system, Microcontroller 8535, Infrared, parking rates, Password
PEMANFAATAN SMS GATEWAY DENGAN GAMMU DAN WEBCAM BERBASIS VISUAL BASIC 6.0 PADA SISTEM KEAMANAN RUMAH Islahuddin, Muhammad Ishaq; Subari, Arkhan
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

Muhammad Ishaq Islahuddin, Arkhan Subari, in this paper explain that in a home security system is very important information dissemination system. One of them by the use of SMS Gateway. By using Gammu and MySQL as a database and use a webcam as a tool for monitoring room in the house. The way this system works is a home security system using a PIR sensor detecting human movement. After that, if the data from the sensors in the microcontroller. Microcontroller then sends the data to a computer through a serial port. On the computer there is a VB 6.0 application. when the PIR sensor detects the presence of a human, the computer will be otomstis capture and send SMS alerts to a database of numbers that have been stored. Keywords : Webcam, SMS Gateway, Gammu, MySQL, Visual Basic 6.0 .
ANALISIS NILAI INDEKS KEANDALAN SISTEM JARINGAN DISTRIBUSI UDARA 20 KV PADA PENYULANG PANDEAN LAMPER 1,5,8,9,10 DI GI PANDEAN LAMPER Arifani, Nur Indah; Winarno, Heru
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

Nur Indah Arifani, Heru Winarno, in this paper explain that interruption of electricity supply for customers is very disturbing activity. Interruption/outage that occurred in the distribution network led to the disruption of continuity of service. Lots and duration of outages at the feeder Pandean Lamper 1,5,8,9, and 10 at Substation Pandean Lamper observed by the authors to get a reliability index value. This observation aims to get the value of SAIFI and SAIDI in substation feeder PDL Pandean Lamper at 1, 5, 8, 9, 10 and compared with a standard value of PLN as a world-class company (WCC) is SAIFI = 3 time/customer/year, SAIDI = 1.66 hours/customer/year. Disorders due to components and equipment as well as the tree is the most dominant cause of the outage. To obtain this index takes a data rate of failure (λ), a long interruption (U) and the number of customers (N) as well as get other customer-oriented index values ​​are CAIFI, CAIDI, ASAI, ASUI. The analysis showed that the reliability index value for the feeder SAIFI value of PDL 1, 5, 8, 9, 10 all have a lower index value of PLN standards. For the fifth feeder SAIDI value only feeder PDL 9 impaired outages longer than four other feeder with an index value of 1.78 hours/customer/year beyond the PLN standard. For those who do not fit the standard feeder PLN performed maintenance measures components, as well as the supervision of the disturbance and other animals. Keywords: distribution network, continuity, blackouts, interruption, SAIFI, SAIDI, CAIFI, CAIDI.
APLIKASI PLC SEBAGAI PENGATUR ARAH PUTARAN MOTOR DC UNTUK MENGGERAKAN PMS PADA MINIATUR GARDU INDUK Aripin, Syarif; Moediyono, Moediyono
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

Syarif Aripin, Moediyono, in this paper explain that experiment PLC module is a module that consists of modules and visual experiments. This experimental module consists of PLC (Programmeble Logic Controller) which contained PLC in Central Processor Unit (CPU), memory such as RAM (Radom Access Memory), EPROM (Erasable Programmable Only Memory), EEPROM (Electrical Erasable Programmeble Read Only Memory), input-output module and power supply units (Power supply). PLC is used as props in a series of applications to set the dc motor speed desired by mengguanakan input of the switch. OMRON PLC used is CP1EE with 40 I / O, ie 24 inputs and 16 outputs, PLC is used here as a regulator to enable drivers dc motor is used as a regulator dc motor rotation direction to move pms. In the later rounds measured measurement value is varied. The results of these measurements can be read on the voltmeter and ammeter. Keywords: Driver Motor, DC Motor, Omron PLC CP1E, PMS.
STUDI KUAT TEKAN BETON DENGAN AGREGAT KASAR DARI BATU KAPUR Hartono, Hartono
GEMA TEKNOLOGI Vol 17, No 3 (2013): Periode April 2013 -Oktober 2013
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Abstract

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. 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 σ 1 bk = 215.41 kg / cm2. Keyword: Concrete construction

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