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All Journal POSITRON SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Ilmu Fisika Specta Journal of Technology
Rahastama, Swastya
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The Self-Absorption Effect of Ni-63 Beta Source to the Silicon Carbide based Betavoltaic Battery Rahastama, Swastya; Saputra, Yohannes Dwi; Waris, Abdul
POSITRON Vol 10, No 2 (2020): Vol. 10 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (741.177 KB) | DOI: 10.26418/positron.v10i2.42006

Abstract

A typical planar structure is the most feasible conceptual design of betavoltaic battery due to its simplicity. The self-absorption of beta source, however, causes a limitation to the geometrical efficiency.  Herein, we tried to investigate the self-absorption event in Ni-63 beta source by changing the geometrical aspects and evaluated its effect on each layer of a 4H-SiC semiconductor as the radiation-electricity converter. The design configuration from previous literature was adopted and the model was developed using Monte Carlo N-Particle X (MCNPX) consists of radioisotope source, semiconductor, and also ohmic contacts. The energy of beta emission was adjusted to the actual Ni-63 beta spectra with an isotropic distribution of ejected particles. The average beta energy deposition degrades along with the addition of source mass thickness, but the n+ substrate has a unique result where a peak is observed at 0.1246 mg/cm2 due to the self-absorption effect. Furthermore, the rectangular surface area magnification gives a positive impact on the beta energy deposition up to 2.48% and the photon average energy deposition up to 137.21%.  The results of average electron absorbed dose are consistent with Oldano-Pasquarelli semi-empirical theory of self-absorption in the beta source, where the upper layer receives a wider angular distribution of particles compared to the lower one, which corresponds to the counting geometrical coefficients.
Identifikasi Potensi Radioaktivitas pada Pisang Ambon (Musa Paradisiaca) dan Kulit Pisang Kepok (Musa Acuminata Balbisiana) Untuk Aplikasi Baterai Nuklir rahastama, swastya; Hidayat, Jefri Pandu; Mahera, Adinda Kholif; Amelia, Rani Marizah; Salsabila, Syifa
SPECTA Journal of Technology Vol. 8 No. 2 (2024): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v8i2.1045

Abstract

Banana peel has a high potassium content, including the presence of the radioactive element K-40. As one of the beta emitters, K-40 has the potential to be a natural radioactive material for use as a betavoltaic nuclear battery source. In this study, the levels of K-40 content and radioactivity of kepok banana peel (Musa Acuminata Balbisiana) and ambon banana peel (Musa Paradisiaca), local varieties from the Balikpapan region, will be examined. Banana peel samples are first dried to reduce the water content and then processed into dry powder by heating for 20 hours. The mass and water content before and after the drying process are tested to observe shrinkage and its effects on the level of radioactivity. XRF testing is conducted to determine the potential potassium content of each sample. Radioactivity levels are measured using a Geiger Counter survey meter with sensitivity in the energy range of 50 KeV - 1.5 MeV. From the drying results, a greater decrease in mass is observed in kepok banana peel compared to ambon banana peel, accompanied by a significant reduction in water content. XRF test results indicate that the drying temperature has an effect on the emitted X-ray intensity. The activity content in kepok banana peel samples is found to be higher than in ambon banana peel. An estimated quantity of kepok and ambon banana peels needed to achieve the required 1 mCi activity for the nuclear battery is approximately 1.1 tons and 1.3 tons, respectively.
Effect of Heat Leakage on Relativistic Quantum Lenoir Engine Performance with a Massless Boson as Working Substance in the Infinite Potential Box Saputra, Yohanes Dwi; Rahastama, Swastya; Firdaus, Rohim Aminullah
POSITRON Vol 14, No 1 (2024): Vol. 14 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i1.64658

Abstract

A study on the effect of heat leakage on power output, thermal efficiency, and reversibility rate in a relativistic quantum Lenoir engine has been conducted. Initially, we analogize the quantum working substance of the engine, a massless boson trapped in an infinite potential box with a movable right wall, as an ideal gas confined in a pistoned cylinder. Then, the total work, heat input, and heat output of each engine cycle which consists of isochoric, adiabatic expansion, and isobaric compression are extracted by applying the concept of quantum thermodynamics. Finally, power output, thermal efficiency, and reversibility rate of the engine are calculated for different variations of the heat leakage constant. The results are the relationship between several parameters which are expressed in the graph of thermal efficiency vs. compression ratio, graph of efficiency/normal efficiency vs. compression ratio, power output vs. efficiency, and reversibility rate vs. compression ratio. The conclusion is that an increase in heat leakage has an effect on reducing the efficiency and reversibility rate of the engine but does not affect its power output. This work will provide a new chapter for further research related to the use of the boson particle as a working substance in the quantum heat engine, especially the study of the heat leakage effect on engine performance.
STUDI PENGARUH TEMPERATUR KALSINASI TERHADAP KOMPOSISI FASA SERBUK ZnO YANG DISINTESIS MELALUI METODE SOL-GEL Nurhayati, Nurhayati; Musyarofah, Musyarofah; Rahastama, Swastya; Shoodiqin, Dian Mart; Prayitno, Budi; Puspitasari, Nurrisma
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.71-78.2024

Abstract

This study investigated the effect of calcination temperature on the phase composition and crystal size of zinc oxide powders synthesised by the sol-gel method. Zn powder, HCl and NaOH were used as precursors in a multi-step process involving dissolution, titration, gel formation, leaching, drying and calcination at temperatures ranging from 300°C to 700°C for 2 hours. Rietveld analysis of X-ray diffraction (XRD) data using MAUD and Rietica software determined phase composition and crystal size. Initial analysis identified a single simonkolleite phase (Zn5(OH)8Cl2) prior to calcination, which disappeared at 500°C. Wurtzite (ZnO) appeared at 300°C, accompanied by secondary phases (NaCl and ZnCl2). The wurtzite content increased to 81.42 wt% at 700°C. Calcination temperature also influenced crystal size, which ranged from 27.34 nm to 110.61 nm for wurtzite at different temperatures. The results highlight the dynamic changes in phase composition and crystal size with different calcination temperatures, providing valuable insights into tailoring zinc oxide properties for various applications.
Penyediaan air bersih bagi masyarakat Sei Wain Balikpapan melalui pembangunan rain water harvesting system terintegrasi filter air Rahastama, Swastya; Fajar, Muhammad Rizal
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 8, No 4 (2024): December
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v8i4.27121

Abstract

Abstrak Ketersediaan air bersih merupakan hal yang sangat krusial untuk menunjang kebutuhan manusia sehari-hari. Pada beberapa lokasi di Balikpapan, kondisi air tanah terkontaminasi dan memerlukan proses khusus untuk mengubahnya menjadi air bersih. Berdasarkan peninjauan lapangan, daerah RT 36 Sei Wain Kelurahan Karang Joang Kecamatan Balikpapan Utara memiliki permasalahan terkait air tanah yang berwarna dan berbau. Terjadinya kekeringan waduk akibat efek El Nino juga menimbulkan turunnya pasokan air bersih dari pemerintah. Pembuatan sistem tadah air hujan terintegrasi filter air dapat menjadi solusi bagi warga sekitar untuk mendapatkan cadangan air bersih. Air hujan sebagai sumber utama air bersih dapat ditampung dan dilakukan filtrasi agar layak digunakan untuk kebutuhan sehari-hari. Akan tetapi, banyak masyarakat belum mengetahui pentingnya proses filtrasi air untuk memastikan kelayakan dari air hujan yang ditampung. Kegiatan PKM ini bertujuan untuk membangun sistem tadah air hujan yang terintegrasi oleh filter air, sekaligus memberikan sosialisasi kepada masyarakat untuk meningkatkan wawasan tentang penggunaan filter air dan pentingnya menampung air hujan. Tahapan kegiatan pengabdian masyarakat terdiri dari peninjauan lapangan, persiapan, pelaksanaan, dan sosialisasi hasil kegiatan. Instalasi sistem tadah air hujan dilakukan pada sebuah masjid sehingga dapat digunakan oleh seluruh warga. Air hujan hasil tampungan diuji dengan melihat kondisi mikrobiologis, pH, dan TDS. Dari hasil kegiatan pengabdian ini, masyarakat merasakan manfaat langsung air baku dari tampungan air hujan yang difiltrasi serta mendapatkan wawasan baru tentang efek penggunaan filter air. Kata kunci: air bersih; edukasi;filter air; RWHS; Sei Wain. AbstractThe availability of clean water is crucial for meeting daily human needs. In some areas of Balikpapan, groundwater is contaminated and requires special treatment to convert it into clean water. Based on field observations, the RT 36 area of Sei Wain in Karang Joang Village, North Balikpapan District, faces issues with groundwater that is discolored and has an unpleasant odor. The occurrence of reservoir droughts due to the El Niño effect has also led to a decrease in the clean water supply from the government. The construction of a rainwater harvesting system integrated with water filters could be a solution for local residents to obtain a reserve of clean water. Rainwater, as the primary source of clean water, can be collected and filtered to make it suitable for daily use. However, many residents are not yet aware of the importance of the filtration process to ensure the quality of collected rainwater. This community service activity aims to build a rainwater harvesting system integrated with water filters, while also educating the community to raise awareness about the use of water filters and the importance of collecting rainwater. The stages of this community service activity include field observation, preparation, implementation, and socialization of the results. The rainwater harvesting system was installed at a local mosque so that it could be used by all residents. The collected rainwater was tested by examining its microbiological condition, pH, and TDS levels. As a result of this community service activity, the community directly benefited from the filtered rainwater and gained new insights into the effects of using water filters. Keywords: clean water; education; RWHS; Sei Wain; RWHS; water filter.
Piezoelectric Trasducer Based Micro Energy Generator Design for Application in Ceramics Mayantasari, Menasita; Al-Zairi, Achmad; Rahastama, Swastya
SPECTA Journal of Technology Vol. 7 No. 1 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.324 KB) | DOI: 10.35718/specta.v7i1.867

Abstract

The rapid development of technology causes humans to provide a large amount of energy, especially electrical energy. One of the new renewable energy sources that is still under development is a piezoelectric-based energy harvester. Piezoelectric itself is a material that has an electric polarizing effect that occurs in certain materials when the material is given a mechanical stress. The potential difference measured across the piezoelectric material is proportional to the applied pressure. This study aims to examine the prototype of a piezoelectric-based micro energy generator using different loadings on ceramics. This research was carried out by making a prototype on a 30x30 cm2 ceramic, and using a piezoelectric in the form of a PZT type. The method used in this research is measuring the voltage of each configuration variation in the piezoelectric circuit. Retrieval of stress data was done by dropping a load of 3 kg, 6 kg and 9 kg for each variation to be tested. The distance between the piezoelectric position and the center of mass affected the resulting voltage, each additional load would cause an increase in voltage, and a series circuit produces a greater voltage than a parallel circuit
Co-Authors Abdul Waris Al-Zairi, Achmad Amelia, Rani Marizah Budi Prayitno Fajar, Muhammad Rizal Firdaus, Rohim Aminullah Jefri Pandu Hidayat Mahera, Adinda Kholif Mayantasari, Menasita Musyarofah Musyarofah Nurhayati Nurhayati Puspitasari, Nurrisma Salsabila, Syifa Saputra, Yohannes Dwi shoodiqin, dian mart Yohanes Dwi Saputra, Yohanes Dwi