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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SAINSTECH: Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Elda Rayhana
Unknown Affiliation
Astronomy Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Other

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MENGUKUR ABERASI ASTIGMATISMA PADA TELESKOP RIFAST 500 F/3.8 MENGGUNAKAN METODE GEOMETRI Dalina Legitawuri; Rhorom Priyatikanto; Elda Rayhana
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 8 (2019): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2019
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (320.019 KB) | DOI: 10.21009/03.SNF2019.02.PA.16

Abstract

Saat ini teleskop Ritchey-Chretien menjadi pilihan banyak astronom dalam melakukan pengamatan. Teleskop Ritchey-Chretien merupakan jenis teleskop reflektor yang mampu mereduksi aberasi koma dan sferis pada citra yang dihasilkan, namun aberasi astigmatisma masih dapat ditemukan pada teleskop ini. Penelitian ini akan membahas pengukuran astigmatisma dengan metode geometri pada citra yang dihasilkan oleh teleskop RiFast 500 f/3.8, yaitu teleskop Ritchey-Chretien dengan diameter 500 mm dan fokus 1900 mm. Luna et al. [7] menganggap metode geometri sebagai metode yang cukup sederhana untuk mengukur astigmatisma pada teleskop karena tidak memerlukan instrumen tambahan serta memiliki hasil yang sebanding dengan tes wavefront. Metode ini didasarkan pada pengukuran kontur elips yang dihasilkan oleh citra bintang yang tidak fokus star [7]. Pada penelitian ini diperoleh dua nilai astigmatisma pada dua posisi koordinat berbeda senilai 258.78 nm dan 300.39 nm. Currently the Ritchey-Chretien telescope is the choice of many astronomers for their observations. The Ritchey-Chretien Telescope is a reflector telescope capable to reduce comma and spherical aberrations in the resulting image, but the aberration of astigmatism still be found on this telescope. The research is about measuring astigmatism aberration on RiFast 500 f/3.8 using geometric method, that is the Ritchey-Chretien telescope with diameter of 500 mm and focus of 1900 mm. Luna et al. [7] consider geometry methods is simple method for measuring astigmatism on telescopes because do not require additional instruments and the results is comparable with wavefront tests. This method is based the geometric analysis of the external contour of the image of a slightly defocused star [7]. In this study two astigmatism values were obtained at two different coordinate positions valued at 258.78 nm and 300.39 nm.
PERANCANGAN ALAT TIMBANGAN HEWAN TERNAK MENGGUNAKAN SENSOR FIBER OPTIC DAN SOFTWARE ARDUINO IDE Rully Syafira Putri; Endang Iriawan; Bambang Widiyatmoko; Elda Rayhana
SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI Vol 33 No 3 (2023): Sainstech: Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Publisher : Institut Sains dan Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37277/stch.v33i3.1660

Abstract

Abstract The type and technique of feeding is the main thing related to the acceleration of livestock development but almost most of the farmers do not pay much attention to the type and quality of feed given to their animals. Therefore, researchers designed the farm animal scales by creating an optical fibre-based sensor and utilizing the Arduino IDE software system for the purpose of making animal farmers aware of the weight information of their animals. The design of the scales has been done in the laboratory of Optoelectronics and Instrumentation, Physics Research Center of Indonesian Institute of Sciences (LIPI) Serpong. The optical fibre sensor system with the received light intensity output was then transmitted by the photodetectors and then Analog to Digital Converter (ADC) process using the Arduino Software. Result of sensor characterization with varying diameter rubber hose with high sensitivity obtained sensor with diameter of 3.1 cm and 2.6 cm. The test results showed that the sensor with a diameter of 3.1 cm was able to withstand pressure of 3.1 kg. F/cm2 or a load equivalent of 905.2 kg. Keywords: Sensors, Optical Fiber, Software Arduino IDE, Livestock
Perolehan Tio2 Dari Iron Ore Mengandung Titanium Melalui Proses Reduksi Karbon Dan Pelarutan Asam Elda Rayhana; Azwar Manaf
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 2, No 02 (2012): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v2i02.1288

Abstract

REDUCTION AND LEACHING PROCESSES. Indonesia has a large source of iron ore which is quite tempting for the purposes of exploitation in form of raw materials as well as for the production of pig iron. However, not all sources of iron ore are proved useful since not only because the present of deposit is scattere dinamounts of less significant but also because it contains element of tin oxide compounds with iron like ilmenite or FeTiO3. However,ilmenite can actually be used as a source of titanium metal which is much more valuable than Fe it self. In order to recover the Ti from their respective compound it is required the release of strong bonds between the atoms in the compound. This paper reports the recovery of Ti oxide of ilmenite containing iron ore which was obtained through a combination of carbon reduction and acid leaching processes. Carbon reduction of iron ore was carried out through mechanical milling between iron ore and carbon with a ratio of 1:1. This was successively followed by a sintering at a temperature of 1000 oC employing a heating rate of 10 ° C/min for 0-3 hours. The reduction process has resulted in the formation of 27.83wt% TiO2. In order to improve the recovery level of TiO2, further reduction process was conducted through an HCl leaching. This successive stage produced fine powders in the form of deposits. Based on our quantitative analysis, the recovery of TiO2 increased to a level of 73.73%.
Pengukuran Sudut Rancangan Penggerak Tempat Solar Cell Berbasis Motor Servo Menggunakan Sensor MMA8451 Dan Busur Derajat Muhammad Rafly; Endang Iriawan; Elda Rayhana
SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI Vol 34 No 1 (2024): Sainstech: Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Publisher : Institut Sains dan Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37277/stch.v34i1.1916

Abstract

Abstract Solar cell is a potential new electrical energy developed in our country, but the current optimization is not optimal, one of which is due to static installation. In this study, a servo motor was used to drive the solar cell based on the angle of the sun, the ESP32 microcontroller as the control brain, and the GY-45 MMA8451 accelerometer sensor and the protractor as the angle meter of the solar cell holder. From the measurement results, it is found that the angle value of the servo motor with a protractor is not the same, there is a difference in numbers from 5° to 20°, while the angle value of the GY-45 MMA8451 fluctuates and varies. From the research results, it is necessary to calibrate the code on the Arduino with the actual angle and the GY-45 MMA8451 sensor is generally very sensitive and susceptible to vibration. Keywords: Servo motor, Protractor, accelerometer sensor GY-45 MMA8451
Co-Authors Azwar Manaf Bambang Widiyatmoko Dalina Legitawuri Endang Iriawan Muhammad Rafly Rhorom Priyatikanto Rully Syafira Putri