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Saintia Fisika
Published by Universitas Sumatera Utara
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Articles 10 Documents
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Search results for , issue "Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika" : 10 Documents clear
PENGARUH VARIASI MASSSA SERBUK ARANG DAN KALSIUM KARBONAT (CaCO3) PADA PROSES KARBURASI TERHADAP SIFAT MEKANIK BAJA KARBON SEDANG Muhammad Junaidi Hakim
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
Publisher : Saintia Fisika

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Abstract

The aim of this research is to acknowledge the insluence of the variation in the mass of CaCO3 as an energizer in the process of carburizing on the mechanical properties of medium carbon steel. The process of a carburizing uses a temperature of 9500C with a time holding of 3 hours. In this process, carbon is retrieved  from a charcoal wood which then is extracted into fine powder, and it is mixed with CaCO3 as its energizer. The mass of calcium carbonate varies at 0%, 5%, 10%, and 15%, each mixed into the charcoal powder in different basins  for the carburizing process. In this research, the mixture of characoal powder and the CaCO3 is added into the carbon steel in a furnace which is then heated at 9500C and it is quenched immediately after it is leated. Later on, the quenched material is tested for its hardnss Vickers and  its  tensile  strength. The hardness Vickers of the unquenched carbon steel is 1478,57 N/mm2 and for tensile strength is 477,905 N/mm2. The result of the hardness Vickers before quenching is 967,52 N/mm2, 953,113 N/mm2, 963,644 N/mm2 for the various samples of 5%, 10%, and 15% of CaCO3. And the result after the material is quenched, is at 1585,307 N/mm2, 2143,142 N/mm2, 1883,442 N/mm2. The result  for the tensile strength before quenching is at 465,625 N/mm2, 541,3 N/mm2, 492,535 N/mm2. Whereas after the process of quenching, the reading shows 502,285 N/mm2, 541,3 N/mm2 and 501,31 N/mm2. Key Words : Carburazing, Hardness, Medium Carbon Steel, Quenching, Tensile Strength.
PENGARUH WAKTU PENAHANAN PANAS (TIME HOLDING) PADA PROSES TEMPERING TERHADAP KEKUATAN TARIK DAN KEKERASAN BAJA KARBON MENENGAH indra gunawan
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
Publisher : Saintia Fisika

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Abstract

In this research, a hardness and tensile strength tested. A test using medium carbon steel with methods quenching, and tempering variying at 30, 60, and 90 minutes, as well as original material. A Testing Machine Type MR - 20 - CT no. 6592 is used for the tensile strength test and Vickers Hardness Tester using the Matsuzawa Seiki no 7104 brand, is used  for the hardness test. First, the original material is heated  at 850 °C which  then is processed in water by quenching. After the quenching process is done, the material is heated again heated again at 400 °C, and a Time Holding process is applied to the heated material variying at 30 minutes, 60 minutes and 90 minutes, and then cooled at room temperature. A result of this research is obtained, the highest reading for  the tensile strength of carbon steel test is the quenching process, which is at 632.98 x 106 N/m2, where as for the hardness of carbon steel is also at the quenching process, which is at 1972.94 x 106 N/m2. Keywords : Hardness, Medium Carbon Steel, Quenching, Tempering, Tensile strength
APLIKASI METODE BEDA HINGGA PADA PERSAMAAN SCHRODINGER MENGGUNAKAN MATLAB odaligo ziduhu lombu
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

The application of finete difference methods to Schrödinger equation in particles for potensial barier uses numerical approach converting finete difference methods into Schrödinger equation, therefor Schrödinger equation will be converted into a discrit form and will be formulated into computer programme using Matlab (Matrix Laboratory) programme language. The result of the computer programme is visualization. The visualization of Schrödinger equation for the potensial barier using software a Matlab with the potensial barier constant according for field L, make a hiperbolic wave (E < V) for field x > 0, and stand wave deBroglie (E > V). Keyword : Wave Schrödinger, Finete Difference Methods, Matlab, Potensial Barier.
STUDI INTRUSI AIR LAUT DENGAN MENGGUNAKAN METODE RESISTIVITAS LISTRIK KONFIGURASI WENNER – SCHLUMBER DI KECAMATAN PANTAI CERMIN PROVINSI SUMATERA UTARA Fitrikayanti Hasibuan
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

Telah dilakukan penelitian tentang pendeteksian intrusi air laut dengan menggunakan metode resistivitas listrik. Penelitian dilakukan di daerah Pantai Cermin Kiri, Kecamatan Pantai Cermin Provinsi Sumatera Utara. Pengambilan data menggunakan alat resistivitimeter, konfigurasi Wenner-Sclumberger. Data yang diperoleh   adalah data arus (I) dan beda potensial (V).  Pengolahan data dilakukan menggunakan perangkat lunak Res2dinv yang hasilnya adalah berupa resistivitas citra resistivitas 2D bawah permukaan. Nilai resistivitas batuan pada lintasan I (jarak ± 1 km dari tepi pantai)  berkisar antara 27,9 Ω.m – 968 Ω.m, pada lintasan II (jarak ± 955 m dari tepi pantai) berkisar antara 14 Ωm – 508 Ωm dan pada lintasan III ( jarak ± 980 m dari tepi pantai) berkisar antara 16,8 Ω.m – 494 Ω.m. Hasil interpretasi menunjukkan tidak ditemukan adanya intrusi air laut di daerah Pantai Cermin Kiri  dilihat dari nilai resistivitas batuannya. Dimana nilai resistivitas batuan yang terkena intrusi sebesar 0,5 Ωm – 5 Ωm.
MEASURING TOOL DESIGN AC POWER MICROCONTROLLER ATMEGA8535 hilman hermawan jufri
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

The electric power gauge has been made based digital power metre AVR microcontroller ATMega 8535 using current sensor in the from of  ACS 712 a number of 5 amperes grading DC voltage,microcontroller AVR ATMega 8535 with ADC(Analog to Digital Converter) in it, and also using LCD 2 x 16 characters it can measure and display the electrical power of a household electronic appliances. ACS 712 current sensor with a maximum output a number of 5 amperes and server to detect AC current flowing in the load and provide AC voltage output which is then converted into DC voltage. Internal ADC microcontroller AVR ATMega 8535 server to convert the output voltage of current sensor into digital data then can be processed and displayed on the LCD. The series of minimum system microcontroller AVR ATMega 8535 and the LCD display are controlled by a program that is created through AVR studio software using the downloader ISP for AVR ATMega 8535. Based on the testing and calibration that has been done to measure the electric obtained an average yield of 4.3214% percentage error rate measurement accuracy of 95.67%.
STUDI INTRUSI AIR LAUT DENGAN MENGGUNAKAN METODE RESISTIVITAS KONFIGURASI DIPOLEDIPOLE DI KAWASAN DESA LUBUK SABAN KECAMATAN PANTAI CERMIN PROVINSI SUMATERA UTARA cristi nuara
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

The research detection of sea water intrusion had been performed using the electrical resistivity methods. The study was conducted in the village of Lubuk Saban, in the district of Pantai Cermin, North Sumatera Province. Taked of data using a resistivitimeter, Dipole-Dipole configuration. The obtained data are current (I) data and potential difference (V) data. Data processing is performed by using Res2dinv software, the result is in the form of 2D resistivity image of the subsurface resistivity. Rock resistivity values on the one track (a distance 25 m from the beach) ranged between 1,08 Ω .m – 116 Ω .m, the second track (a distance 34 m from the beach) ranged from 4,54 Ω m – 71,5 Ω m and the third track (a distance 44 m from the beach) ranged between 0,152 Ω m – 53,1 Ω m. Interpreted data showed that the intrusion of the sea water has been found in the village of Lubuk saban with the resistivity value of rocks ranged from 0,5 to 5 Ω m. Keywords: sea water intrusion, Dipole-Dipole configuration, porosity, permeability
VISCOMETER DIGITAL DESIGN FOR MEASURING VISCOSITY OIL WITH MICROCONTROLLER ATMega8535 PC nurjannah nurjannah
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

Design digital viscosimeter base on ATMEGA8535 mikrocontroller have been conducted by using ball method fall, used sampel that is cooking oil  have brand ( A), bulk cooking oil which not yet been weared ( B), bulk cooking oil once wear ( C) and glycerine. The Viscosimeter have in test-drive to determine viscositas which  its result of Oil of A = 3,16 Poise x10-3, Oil of B = 3,30 Poise x10-3, Oil of C = 3,11 Poise x10-3, and Glycerine = 1,28 Poise and by using conventional viscosimeter ( its result manual) of Oil of A = 3,40x10-3 Poise, Oil of B = 3,60 x10-3 Poise, Oil of C = 2,78x10-3 Poise, and Glycerine = 1,20 Poise. Result of from compared to digital viscosimeter of conventional viscosimeter ( manual) in the reality its result come near so that can be said that by this appliance have been able to measure cooking oil viskositas of A, B, C and glycerine. And with efficacy of scheme of this digital viskosimeter have earned to replace measurement of conducted viskositas manually the which measurement can be conducted swiftly is, accurate, and practical
Perancangan Sistem Pengukur Jarak Antara 2 Titik Wireless Xbee Pro Berdasarkan Nilai RSSI Ahmad Deny Andika
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

Secara umum, pengukuran jarak berdasarkan waktu tempuh data memberikan nilai waktu tempuh yang didapat akan selalu berubah secara signifikan dan tidak dapat ditentukan perubahannya. Oleh karena itu, dalam paper ini pengukuran dilakukan berdasarkan kekuatan sinyal yang diterima. Hal ini bertujuan untuk mengetahui tingkat keakurasian pengukuran dengan menggunakan wireless. Dalam penelitian ini, pertama adalah menganalisa teori tentang pengukuran jarak menggunakan RSSI dan pengaruhnya, kemudian merancang sistem untuk pengukuran. Nilai RSSI yang didapat diproses oleh mikrokontroller ATMega328P dan kemudian dikirim ke Visual Basic pada PC untuk dianalisa ke jarak. Di dalam visual basic digunakan model nilai rata-rata untuk memproses dan mengambil data akhir RSSI dari Xbee Pro ZB. Setelah penelitian dilakukan, diperoleh kesimpulan bahwa pengukuran kesalahan rata-rata adalah 2,35 meter dengan jarak sebenarnya 5-90 meter. Katakunci : RSSI , Visual basic,  Xbee pro ZB
PERANCANGAN INSTRUMENT MINIATUR MONITORING ARUS LISTRIK PLN RIENI KALESTA SITANGGANG
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

Already designed miniaturized instruments for monitoring the electrical current to the input electrical current of2 A and 4 A, using some of the load instead of the customer. Instrument designed transformer email surrounded 1.2mm wire to detect the flow of microcontroller ATMega 8535 and completed the program to change the scale analogvoltage output transformer into a digital scale and then displayed on the PC in the form of graphs appropriateamount of electrical current used load, number of current is not used in the time scale, and the event of the use incurrent exceeds the electric current in the monitor will display "Overload Detected".Keywords: Instrument, miniature, monitoring electrical current.
PEMBUATAN DAN KARAKTERISASI KOMPOSIT SERAT PALEM SARAY DENGAN MATRIKS EPOKSI Wenny Yoweri Gulo
Saintia Fisika Vol 3, No 1 (2013): Vol 3/No 1(2013):Saintia Fisika
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Abstract

Telah dilakukan penelitian mengenai pembuatan dan karakterisasi komposit serat palem saray dengan matriks epoksi dengan metode Chopped Strand Mat. Komposisi serat dibuat dengan variasi 0%, 1%, 2%, 3%, 4%, 5% terhadap massa matriks. Pembuatan komposit serat palem saray yaitu, serat  direndam dengan NaOH selama 1 jam, dibilas dengan air bersih dan dikeringkan, kemudian ditimbang. Epoksi dan hardenernya diaduk dengan motor stirrer kemudian dituang ke cetakan dan dipress selama 60 menit pada suhu 70oC. Tujuan dari penelitian ini adalah untuk mengetahui sifat fisis dan mekanik komposit. Nilai densitas 0,858g/cm3 sampai 1,173g/cm3, nilai daya serap air 0,75 %  sampai 4,89 %, nilai kadar air  0,89% sampai 8,94 %,  nilai kuat tarik 9,61 MPa sampai 13,14 MPa. nilai kuat lentur 23,52 MPa sampai 104,85Mpa, nilai kuat impak  24,3 kJ/m2 sampai 38,5kJ/m2. Komposit telah memenuhi syarat  JIS A 5905:2003. Komposit serat palem saray dengan matriks epoksi dapat direkomendasikan  sebagai bahan bemper mobil.

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