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Saintia Fisika
Published by Universitas Sumatera Utara
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Core Subject : Science,
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Articles 10 Documents
 1 
Search results for , issue "Vol 5, No 1 (2013): Saintia Fisika" : 10 Documents clear
PENGEMBANGAN RANCANG ALAT PENGUKUR INDEKS MASSA TUBUH BERBASIS ATmega8535 DAN DATABASENYA BERBASIS PC oki handinata
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Seiring dengan kemajuan teknologi sekarang ini banyak peralatan elektronik yang sudah dikontrol secara otomatis. Penggunaan sistem Instrumentasi yang dikontrol secara digital ini banyak juga digunakan baik untuk keperluan industri maupun komersial. Dalam penggunaan dan pemanfaatan sistem Instrumentasi ini pekerjaan manusia akan terselesaikan dengan waktu yang cepat, tepat dan akurat. Oleh karena itu manusia diharapkan mampu mengembangkan dan menggali sumber-sumber ilmu yang dapat meningkatkan kinerja perangkat Instrumentasi yang bisa membantu pekerjaan manusia itu sendiri. Tujuan perancangan dan pembuatan alat pengukur Indeks Massa tubuh  ini adalah untuk mempermudah pekerjaan dalam bidang perhitungan serta mengetahui nilai ideal di suatu Rumah Sakit, Puskesmas, Kantor Kepolisian dan tempat lainnya yang di kendalikan oleh program Visual Basic (VB). Oleh karena itu sebagai mahasiswa di harapkan dapat merancang sesuatu alat yang dapat bekerja secara sistematis.  
APLIKASI LASER CO2 UNTUK PEMOTONGAN (CUTTING) MATERIAL MENGGUNAKAN MESIN CNC (CONTROL NUMERIC COMPUTER) yenny toguan samarya
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Laser cutting is a tecnology that uses a laser as cutter  that is a cutting the material, works with led high power at a specific location laser cutting receive data directly from computers that could run on cutting automation CNC machine ( Control Numeric Computer ) . By designing the pattern cutting by using Autocad 2010 as CAD  ( Computer Aided Desain ) and then converted to USBCNCV3 as CAM ( Computer Aided Manufacturing ) .  Laser cutting process on the research using laser CO2 with the material to be cut is acrylic, plastic high voltage, and  the plastic covers with size of 10 cm x 10 cm  to be cut with a 10 cm diameter circle pattern by using power 3,5 watts. Laser cutting processs varied for blowing gas, materials, and the thickness of the material with the power and the focal point of the laser CO2 anyway. Keywords :  Laser cutting, laser CO2, CAD, CAM
APLIKASI LASER KONTINYU DALAM ANALISIS MATERIAL BERDASARKAN CRATER YANG DIHASILKAN emy alemmita br tarigan
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

The interaction of laser have been done with a particular material. The type of laser that been used is continue laser. One of the laser is CO2 laser  with wavelength of 10.6 nm and the CO2 laser that we used has power ± 8 watt.. Interaction process is done at the focal point and defokus each laser. In CO2 laser the focal point is 5 cm and the defocus is 7 cm in front of the lens. In the process of laser interaction with the material, the most influential physical properties of the material is the melting point of the material. The melting point of silicon rubber, which 1410oC is higher than acrylic material which has 160oC and the plastic has 115-125 oC. The higher is needed the melting point of the material, the greater and the longer interaction time. The size of the resulting crater diameter depends on the laser output power, the time, the focal point of the laser defocus and the type of materials used. So it is known that silicon rubber requires the highest power and longest time so that size is wider in diameter than the plastic and acrylic materials.
INSTRUMENTASI VIRTUAL MENGGUNAKAN LABVIEW DAN SOUNDCARD stevani agnesia sigiro
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

The high cost of instrumentation equipment such as signal generate and oscilloscope makes it difficult to have it, especially for human purposes in laboratory practicum. Besides the price is quite expensive, instrumentation equipment is expected to be removable (portable). To overcome the problem of price and portability, so in this study used soundcard as a virtual signal generate and virtual oscilloscope using LabVIEW Evaluation software version 11 (Laboratory Virtual Instrumentation Engineering Workbench). The results showed that the virtual signal generate is designed to have good performance with average errors of 0.2% and 0.0015% accuracy in the frequency range 20 Hz - 20 kHz. While in the same frequency range, testing on a virtual oscilloscope measurements produced a mean error of 0.0024%. In addition to reading measurement accuracy and waveform generation, virtual signal generate and virtual oscilloscope can display multiple waveforms such as sine wave, square wave, sawtooth wave, and triangle wave. Keywords : Soundcard, LabVIEW, Virtual Signal generator, Virtual Oscilloscope
APLIKASI PEMBANGKIT PWM UNTUK MENGENDALIKAN KIPAS PADA DESKTOP KOMPUTER BERBASIS MIKROKONTROLER ATMEGA 8535 K esrawati siregar
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Has been designed and realized PWM Generator Application for controlling Fan  on Desktop computer based Microcontroller ATMega8535. With the automatic control system that work to keep the electronic component from overheating problem. Temperature control system governed by the PWM signal. Therefore the PWM signal will be generated by controlling the pulse width of the PWM signal (Ton) and temperature values are referenced from the input keypad. Moreover the system is designed and equipped with a temperature sensor LM35 each of which is installed in the PSA, RAM and Processor which will be used to detect any changes in temperature that occur in each individual sensor and temperature sensor value changes and the resulting pulse width will be displayed to the LCD. Keyword : PWM, , LM35, controlling Fan
PEMBUATAN DAN KARAKTERISASI KOMPOSIT SERAT KULIT JAGUNG DENGAN MATRIKS EPOKSI eldo jones surbakti
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Preparation and characterization of corn husk fiber composites with epoxy matrix by the method of Chopped Strand Mat the fiber composition: 0%, 1%, 2%, 3%, 4%, 5% have done well. The physical properties and mechanical properties of composites were obtained as density of 1.07 g/cm3 - 1.25 g/cm3, water absorption 0.75% - 3.55%, water content 0.90% - 4.33%, tensile strength 7.73 MPa - 10.02 MPa, 28.62 MPa flexural strength - 55.62 MPa, 3 kJ/m2 strong impact - 18.6 kJ/m2. The results showed physical properties and mechanical properties are almost the same as the Standard JIS A 5905:2003. It means the material used on this reseand can be applied to outomotive car such as bumper.Key words : epoxy, composites, corn huskfibers, physical properties, mechanical properties.
Pembuatan Dan Karakterisasi Kertas Dengan Bahan Baku Tandan Kosong Kelapa Sawit dewi fransiska br tarigan
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Telah dilakukan penelitian tentang pembuatan dan karakterisasi kertas dengan bahan baku tandan kosong kelapa sawit. Karakterisasi  terhadap kertas yang dibuat dari tandan kosong kelapa sawit ini  yakni: Gramatur rata-rata 78,1 gr/m2 sesuai dengan SNI 14-0439-1989, tebal kertas rata-rata 0,4556 mm sesuai dengan SNI 14-0435-1998, kuat tarik rata-rata 0,43 x 103 N/m sesuai dengan SNI 14-4737-1998, dan kuat sobek rata-rata 178,2 x 10-3 N sesuai dengan SNI 0436:2009. Dalam parameter tersebut maka kertas yang diperoleh dapat dikatagorikan ke kertas tissue  menurut SNI 14-0103-1998. Kata kunci : Tandan Kosong Kelapa Sawit, Pulp, Kertas dan Sifat Fisik
Analisis Sifat Magnet Dan Mekanik Pada Permanent Bonded Magnet Pr-Fe-B Dengan Matriks Bakelit Tian Havwini
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Bonded magnet is composite magnet material made by mixing magnetic powder with non-magnetic binder. Bonded permanent magnet Pr-Fe-B with bakelite matrix made manually by mixing powder of Praseodymium Iron Boron (Pr-Fe-B) commercial MQP type 16-7 with binder by using mortar. The composition of bakelite powder was varied at 2, 4, 6 and 8 weight% respectively from each 8 gram total mass. Then this mixture was pressed by using dry compression moulding method with pressure 5 ton and dried at 150ºC for 2 hours. Magnetic properties were characterized by measuring flux density using Gaussmeter and hysteresis loop by using Permagraph. While compressive strength was characterized using Universal Testing Machine and hardness was characterized using Brinell hardness method. The results showed that increasing portion of binder would increase hardness and compressive strength qualitatively but decreased the magnetic properties. The best magnetic properties value obtained for the 2 weight% composition of bakelite and the value of flux density = 1186 gauss, Br = 6.63 kG, HcJ = 6.962 kOe, BHmax = 7.98 MGOe, hardness = 42.2 BHN and compressive strength = 101.4 MPa.
PEMBUATAN MAGNET BONDED PERMANEN PrFeB DENGAN BINDER POLYESTER DAN SILICONE RUBBER Hilda Ayu Marlina
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Research on fabrications of bonded magnets PrFeB type MQEP 16-7 with polyester and silicone rubber binder has been done. The purpose of this study is determination of the effect of polyester and silicone rubber matrix on the mechanical and magnetic properties in the manufacture of bonded magnets PrFeB. The process of fabrications bonded magnets PrFeB made by mixing powder and magnets PrFeB respectively - each with variations binder composition (wt%) are 2, 4, 6, and 8. For each sample takes 8 grams total mass of bonded magnets PrFeB. The samples were made by using compression molding method with a sample pressure of 5 tons. Curing temperature of 150° C for samples bonded magnet with polyester binder and room temperature for samples bonded magnet with silicone rubber binder. The results showed that the best magnetic field derived from the manufacture of bonded magnets with the addition of 2% silicone rubber binder at 1156.9 G and energy product (BH)max 9.15 MGOe, with a value of 10.4 BHN Brinell hardness and compressive strength of 22.3 MPa.Keywords: Bonded magnet, PrFeB, polyester, silicone rubber, magnetic properties, mechanical properties
PENGARUH KOMPOSISI BAHAN BAKU SECARA STOIKIOMETRI DAN NON STOIKIOMETRI TERHADAP SIFAT FISIS DAN MAGNET PADA PEMBUATAN MAGNET PERMANEN BaO.6Fe2O3 kharismayanti Ritonga
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

ABSTRACTWe have made hard magnetic Barium Heksaferit from BaCO3 and Fe2O3 technical with varying composition of BaCO3 and Fe2O3 in Stoichiometric ratio (1:6) and Non Stoichiometric ratio (1:6,5). Preparation process by wet mixing and grinding by using Plenatery Ball Milling (PBM) and dried, The testing of Analyze Temperature Differential (DTA) to determine the calcination temperature. The powder then calcined at 10000C and held for 2 hours. Subsequently analyzed using X-Ray Diffractometer (XRD) and the results indicate that the structure has been formed BaO.6Fe2O3. The powder was then sieved to pass 400 mesh (38μm) by adding 3 %wt seluna as adhesives. Printing was done using a magnetic anisotropy field press and pressurized at 5 tons. Then sintered with temperature 11500C, and held for 2 hours. Characterization includes: XRD analysis, flux density measurements with a gaussmeter, measure the density, porosity, BaO.6Fe2O3 morphology with SEM andmeasurement BH curve with permagraf. From the research that has a magnetic Barium Heksaferit the highest magnetic field strength magnets are made with Non-Stoichiometric, is 506,3 Gauss, density = 3,9 g/cm3, porosity = 5,96%, shrinkage = 21.37%, Remanensi (Br) = 1,27 kG, Coercivity (HcJ) = 3,88 kOe, Energy product (BH max) = 0.36 MGOe.Key Word : Hard Megnetic, BaO.6Fe2O3, Stoichiometric and Non stoichiometric ratio, density, BH curve.

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