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Saintia Fisika
Published by Universitas Sumatera Utara
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Articles 59 Documents
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PENGUKURAN DAYA LASER CO2 DAN LASER DPSS SERTA PENGAMATAN BEAM PROFILER SINAR LASER DPSS DAN LASER He-Ne MENGGUNAKAN CCD Helen Martina Manurung
Saintia Fisika Vol 4, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

This research has done measuring the power by varying the current of laser CO2 and laser DPSS, observation the beam profiler of laser beam DPSS and laser beam He-Ne and observation the spectrum wavelength of laser DPSS and laser He-Ne. In this case of measuring the power by varying the current of laser CO2 and laser DPSS, the measuring has done more than once in order to concluded how the stability of the power that produced by each of the laser. The result of this measuring is laser DPSS produced the power more stable than the laser CO2 but the laser CO2 produced the power more bigger than the laser DPSS. In this research, the observation the beam profiler of laser beam DPSS and laser beam He-Ne by using CCD which is the censor to record the figure of light emited by the laser and then transmitted to the computer and processed by using software Laser Beam Analyzers to show the type of 2 dimension and 3 dimension of the laser. After that doing this observation, the conclusion are the distance of the CCD form the laser DPSS is 32 cm and the diameter of the laser beam is 3,673 mm and the distance of the CCD from the laser He-Ne is 10 cm and the diameter of the laser beam is 4,451 mm. In this research also made the observation of the spectrum wavelength of the laser by using spectrometer HR4000. Kata kunci : Laser CO2, Laser DPSS, Laser He-Ne, CCD
SISTEM PENGUKURAN DETAK JANTUNG MANUSIA MENGGUNAKAN MEDIA ONLINE DENGAN JARINGAN WI-FI BERBASIS PC AHMAD NAWAWI HARAHAP
Saintia Fisika Vol 4, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Heart is a vital organ inside human body. Its function is for blood circulationinside body through vein. Heart Beat frequency and strength are different from personto person. Heart rate detection is needed to determine whether or not a heart condition..Usually, the detection of heart beat is conducted by touching fein beat at human hand.The method needs a high consentration and needs a stopwatch. Modern technologyallows us to produce automatic instruments to do heart beat monitoring through fein.The instrument built will detect heart beat through blood flow frequency at hand finger,and will process the information electronically. This instrument will show the totalheart beat in every minute and the beat rhythm in graphic visualitation using GraphicPC, so that the result can be viewed on the monitor screen.Keywords : Heart Beat, Blood Flow, PC
PERANCANGAN MONITORING JARAK JAUH KETINGGIAN AIR PADA BENDUNGAN MENGGUNAKAN SISTEM ANDROID VIA JARINGAN WI-FI irma sika girsang
Saintia Fisika Vol 4, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

In this writing of this essay has discussed a problem about “DESIGN OF DISTANCEMONITORING IN DAM LEVEL USING ANDROID SYSTEM VIA WI-FI NETWORK”. Thistools used for remote monitoring from distance ofthe water level atthe dam using android. Soit can easer us to monitor the dam though from a great distance. Simulation of this dam usingAT89S51 Microcontroller, conductivity sensor, PSA, Relay, water pump system also Androidand PC as Server and Receiver when the tool works. conductivity sensor works read the leverof water and then sent to e server that can be monitored from great distance using android.This tools work when sensor detect the level of water then the microcontroller and sent thedata to the PC by RS232 and in the computer displayed visualization the lever of water andbroadcasted by wifi network.This program created to readthe level of water and detected bysensor. The data sent to the PC by serial port.Keywords: Conductifity Sensor, AT89S51, Android system, VNC
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.

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