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INDONESIA
Jurnal Pendidikan Fisika Indonesia
Published by Universitas Negeri Semarang
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education,
Education Physics
Arjuna Subject : -
Articles 553 Documents
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PENINGKATAN KINERJA SISTEM KESELAMATAN PASIF PADA REAKTOR NUKLIR DENGAN PENAMBAHAN KOMPONEN RVACS
Jurnal Pendidikan Fisika Indonesia Vol 10, No 2 (2014)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v10i2.3453

Abstract

Kelengkapan sistem keselamatan pasif dan inheren pada reaktor lanjut merupakan prasyarat utama. Makalah ini mengeksplorasi hasil desain konseptual sistem pembuang sisa panas pada pusat listrik tenaga nuklir berjenis Very High-Temperature Reactor. Tujuan riset ini untuk merancang sistem pembuang sisa panas pusat listrik tenaga nuklir yang terdapat pada dinding reaktor. Studi kinerja Reactor Vessel Auxliary Cooling System (RVACS) dilakukan pada dua jenis pendingin yaitu Timbal-Bismut dan Liquid Salt. Panas dari dinding reaktor dihapus melalui sirkulasi alamiah pada keadaan tunak. Analisis melibatkan sistem perpindahan panas secara radiasi, konduksi dan konveksi alami. Perhitungan perpindahan panas dilakukan pada elemen reaktor vessel, dinding luar guard vessel, dan pelat pemisah. Hasil analisis kecelakaan menunjukkan kedua jenis sistem pendingin reaktor dan sistem pasif sisa pembuangan panas cukup menghapus sisa panas hasil peluruhan dengan sirkulasi alami.ABSTRACTCompleteness of passive safety systems and inherent in advanced reactors is a major prerequisite. This paper explores the results of a conceptual design of the heat removal system at the nuclear power plant (NPP) type Very High-Temperature Reactor. The purpose of this research was to design the reactor vessel auxiliary cooling system (RVACS) of NPP located within the reactor walls. The RVACS performance study was conducted on two types of coolant: Lead-Bismuth and Liquid Salt. Heat was removed from the reactor vessel through the natural circulation in the steady state. Analyses of heat transfer systems involved radiation, conduction and natural convection. Heat transfer calculations were performed on the reactor vessel, guard vessel, and perforated plate. The results from the accident analysis showed that both types, the reactor coolant system and the passive residual heat removal system, adequately remove remaining heat of the decay by a natural circulation.
Development of Motion Learning Media and Energy Conservation Law Through Coaster Tracks Based on Logger Pro Analysis
Jurnal Pendidikan Fisika Indonesia Vol 15, No 1 (2019)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v15i1.17253

Abstract

Research has been conducted to find out relation position and speed to time, for objects that glide on a magnetic foundation by applying the Research and Development method. Data retrieval is done by using video train motion recordings which are analyzed using Logger Pro. The results of the analysis are represented in the form of data and graphics. Based on the data analysis and fitting using the Logger Pro, the following values are obtained: vtrain 0.027 m/s, atrain 0.034 m/s2, average train velocity 0.02572 m/s and average train acceleration 0.03662 m/s2 with RMSE (Root Mean Square Error) value of 0.013 m. The acceleration value obtained is very small and almost close to zero, so it can be said that objects that experience irregular straight motion. The graph representation of velocity over time shows an increase in speed that is not constant. This is because there is still friction between the train and the runway and friction between magnets along the track with friction forces 4,566 N. The value of kinetic energy, potential energy, and mechanical energy can be determined by using the results of Logger Pro analysis.Telah dilakukan penelitian untuk mengetahui grafik keterkaitan posisi dan kecepatan terhadap waktu, untuk benda yang meluncur di atas landasan magnetik dengan menerapkan metode Research and Development. Pengambilan data dilakukan dengan menggunakan video rekaman gerak kereta yang dianalisis menggunakan Logger Pro. Hasil analisis direpresentasikan dalam bentuk data dan grafik. Berdasarkan analisis dan fitting data menggunakan Logger Pro diperoleh nilai sebagai berikut   vkereta 0,027 m/s, akereta 0,034 m/s2, v rata-rata kereta 0,02572 m/s dan arata-rata kereta 0,03662 m/s2 dengan nilai RMSE (Root Mean Square Eror) sebesar 0,013 m. Nilai percepatan yang diperoleh sangat kecil dan hampir mendekati nol, sehingga dapat dikatakan bahwa benda mengalami gerak lurus beraturan. Representasi grafik kecepatan terhadap waktu memperlihatkan pertambahan kecepatan yang tidak konstan. Hal ini dikarenakan masih terdapat gesekan yang terjadi antara kereta dengan landasan maupun gesekan antar magnet di sepanjang lintasan dengan gaya gesek 4,566 N. Nilai energi kinetik, energi potensial, dan energi mekanik dapat ditentukan besarnya menggunakan data hasil analisis Logger Pro.
USING INTEGRATED TYPE ON SCIENCE LEARNING FOR IMPROVING JUNIOR HIGH SCHOOL STUDENTS’ CRITICAL THINKING SKILLS
Jurnal Pendidikan Fisika Indonesia Vol 12, No 1 (2016)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v12i1.5460

Abstract

The purpose of this study is to know improvement junior high school students’ critical thinking skills through integrated type on science learning and students’ respons. Using quasi-experimental methods, the study employed non-equivalent pre-test and post-test control group design. The research involved 68 seventh grade students using integrated type. Critical thinking test was used to collect data as pretest and posttest. The data showed that participant utilized integrated type in experimental groups performed significantly better than controls group (p0.05) on critical thinking test. The result showed that integrated type in science learning can lead to learning gains that exceed those critical thinking in classes where mainly convensional science learning methods are used.Keterampilan berpikir kritis merupakan keterampilan berpikir dasar yang harus dimiliki oleh seseorang dalam menghadapi tantangan perkembangan IPTEK secara bijak. Penelitian ini bertujuan untuk mengetahui peningkatan keterampilan berpikir kritis siswa SMP melalui pembelajaran IPA tipe integrated dan tanggapan siswa. Penelitian ini menggunakan metode kuasi eksperimen dengan desain non-equivalent pretest and posttest control group. Subyek penelitian adalah 68 siswa kelas VII yang terbagi kedalam kelas eksperimen dan kelas kontrol. Pengukuran keterampilan berpikir kritis menggunakan tes pilihan ganda beralasan. Temuan penelitian menunjukkan terjadi peningkatan keterampilan berpikir kritis kelas eksperimen sebesar 0,52 dengan kategori sedang lebih tinggi dibandingkan kelas kontrol sebesar 0,29 dengan kategori rendah.  Hasil uji t nilai N-Gain keterampilan berpikir kritis menghasilkan penolakan terhadap Ho (p0.05). Dengan demikian dapat disimpulkan bahwa pembelajaran terpadu tipe integrated konsep perubahan dapat meningkatkan keterampilan berpikir kritis siswa SMP. Hampir keseluruhan siswa memberikan tanggapan positif terhadap pembelajaran terpadu tipe integrated.
Kajian Pengaruh Radiasi Sinar Gamma Terhadap Susut Bobot Pada Buah Jambu Biji Merah Selama Masa Penyimpanan
Jurnal Pendidikan Fisika Indonesia Vol 10, No 1 (2014)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v10i1.3055

Abstract

Telah dilakukan radiasi pada sampel jambu biji merah (psidium guajava linn) pada variasi dosis 0.2, 0.4, 0.6, 0.8, dan 1 kGy menggunakan sinar gamma dengan sumber isotop Co-60 serta sampel yang tidak diradiasi sebagai sampel kontrol. Penelitian ini bertujuan untuk mengetahui pengaruh radiasi sinar gamma terhadap susut bobot sebagai indikasi dari terjadinya perlambatan proses fisiologis pada buah jambu biji merah selama masa penyimpanan. Sampel jambu biji merah diradiasi sesuai dosis yang ditentukan kemudian disimpan dalam wadah plastik selama 8 hari masa penyimpanan. Hari ke 4 dan ke 8 dilakukan evaluasi terhadap massa sampel untuk mengetahui penyusutan bobot yang terjadi. Hasilnya menunjukkan bahwa sampel yang tidak diradiasi mengalami penyusutan bobot rata-rata 20.27% dan sampel yang diradiasi mengalami penyusutan bobot rata-rata sebesar 1.23 – 5.98%. Perlakuan radiasi gamma mampu memperlambat proses fisiologis dimana terjadi perlambatan penyusutan bobot pada buah jambu biji merah selama masa penyimpanan. The samples of red guava (psidium guajava linn) have been irradiated at variation doses of 0.2, 0.4, 0.6, 0.8, and 1 kGy using gamma rays with Co-60 isotope source and un-irradiated samples as control. The purpose of this research was to determine the effect of gamma irradiation on shrinkage weights as indication of slowing in physiological processes on red guava fruit during storage. Red guava fruit samples were irradiated in certain doses then saved in plastic pan during 8 days storage time. The fourth and eighth day sample mass was measured to determine the shrinkage of the weight. The result showed that un-irradiated sample was shrinkage weighted average 20.27% and the samples were irradiated shrinkage weight by an average of 1.23 to 5.98%. Gamma irradiation is able to slow the physiological processes which cause shrinkage weight on red guava fruit during storage.
The Effectiveness of Basic Physics Experiment Module Based on Guided Inquiry Model in Improving Hard Skills and Soft Skills of Prospective Physics Teachers
Jurnal Pendidikan Fisika Indonesia Vol 14, No 2 (2018)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v14i2.11579

Abstract

The purpose of this research is to identify the effectiveness of the first basic physics practice module based on guided inquiry on improving students’ hard skills and soft skills. The experimental design is "One Group Pretest-Pottest Control Groups Design". The samples of the research are the students who take the first basic physics practice. Data analysis techniques were effect size and gain score. Based on the result of the research, it was found that the improvement of hard skills and soft skills of the students reached 0.49 and 0.61 which was categorized as moderate. For effect size obtained data of 2.65 and 3.61 for hard skills and soft skills are categorized very high. It can be concluded that the effectiveness of the use of the first basic physics practice module based on guided inquiry is very significant to improve hard skills and soft skills of the students.Tujuan penelitian ini untuk mengidentifikasi keefektifan penggunaan panduan praktikum fisika dasar 1 berbasis guided inquiry terhadap peningkatan hard skills dan soft skills mahasiswa. Desain eksperimen yang digunakan adalah One Group Pretest-Postest Control Groups Design. Sampel penelitian adalah mahasiswa yang menempuh praktikum fisika dasar 1. Teknik analisis data yang digunakan adalah effect size dan gain score. Berdasarkan hasil penelitian diperoleh peningkatan hard skills dan soft skills mahasiswa mencapai 0.49 dan 0.61 yang berkategori sedang. Hal ini menunjukkan bahwa penggunaan panduan praktikum fisika dasar 1 dapat meningkatkan hard skills dan soft skills mahasiswa. Untuk uji effect size diperoleh data sebesar 2.65 dan 3.61 untuk hard skills dan soft skills yang berkategori tinggi. Dari hasil penelitian dapat disimpulkan bahwa kefektivitas penggunaan modul panduan praktikum fisika dasar 1 berbasis guided inquiry sangat efektif untuk meningkatkan hard skills dan soft skills mahasiswa.
ANALYSIS OF PROSPECTIVE PHYSICS TEACHERS’ FEEDBACK ON ONLINE PEER-ASSESSMENT IMPLEMENTATION
Jurnal Pendidikan Fisika Indonesia Vol 13, No 1 (2017)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v13i1.6509

Abstract

This study aimed to analyse prospective physics teachers’ feedback during the implementation of online peer-assessment in Teaching Physics in English course. Twenty prospective physics teachers participated in this study. They were familiar with the use of smart phone in their daily life. They tend to communicate using social media such as WhatsApp application. The students have practiced in using paper based peer-assessment in other courses, but they have not applied it in online method providing real time feedback and score. The implementation of online peer-assessment challenged the students to assess their peer objectively. The lecturers’ feedback influence students’ skills how to evaluate their peer performance. Several factors may influence the quality of students’ online peer-assessment such as students’ culture back ground, implementation of the online peer-assessment, and practicant’s performance.
MULTILAYER POROUS COMPOSITE FROM WASTE GLASS FOR WATER FILTRATION
Jurnal Pendidikan Fisika Indonesia Vol 11, No 2 (2015)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v11i2.4218

Abstract

Multilayer porous composite have been produced through the heating process at temperature T=700oC for 2.5 h. Single layered porous composite was made with a varied mass percentage of from PEG polymer  1% to 10%. Double-layered porous composite were made by the arrangement of porosity (4:3)%, (4:2)% and (3:2)%, while the three-layers porous composite have an arrangement (4:3:2)%. Performance of multilayer porous composite for water filtration with pollutants of methylene blue 100 ppm was estimated from the absorbance spectrum. Rejection of methylene blue pollutants from single layered porous composite increases when the fraction of PEG polymer tend to be smaller in the matrix. Meanwhile, the double layered porous composite has a degradation of methylene blue pollutants are better than one layer. Triple layered porous composite have good performance for the water filtration where all the pollutants of methylene blue be able to be filtered.   Komposit pori berlapis telah dihasilkan dengan proses pemanasan pada temperatur T=700oC selama 2.5 jam. Komposit pori satu lapis dibuat dengan variasi persen massa polimer PEG 1% hingga 10%. Komposit pori dua lapis dibuat dengan susunan porositas (4:3)%, (4:2)% dan (3:2)%, sedangkan komposit pori tiga lapis memiliki susunan porositas (4:3:2)%. Kinerja komposit pori berlapis untuk filter air dengan polutan methylene blue 100 ppm diestimasi dari spektrum absorbansi. Rejeksi polutan methylene blue dari komposit pori satu lapis meningkat saat fraksi polimer PEG cenderung lebih kecil dalam matrik komposit. Sedangkan, komposit pori dua lapis memiliki kemampuan untuk degradasi polutan methylene blue yang lebih baik dari satu lapis. Komposit pori tiga lapis memiliki kinerja yang baik untuk filter air dimana seluruh polutan methylene blue mampu disaring. 
SYNTHESIS AND OPTIMIZATION OF CARBON NANOPARTICLES (C-DOTS) AS ABSORBER MATERIALS FOR SOLAR DISTILLATION APPLICATIONS
Jurnal Pendidikan Fisika Indonesia Vol 12, No 2 (2016)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v12i2.7518

Abstract

Carbon nanoparticles (C-Dots) were synthesized using citric acid and urea as carbon and fuel source, and combustion reaction methods. The absorption spectral and morphology particles of C-Dots were investigated. The morphology describes the synthesis of small (1 ?m) and monodispersedC-Dots. Thus, the C-Dots solutions has absorption spectral range of about 86% at visible light spectral. This study suggests that the as-prepared carbon nanoparticles (C-Dots) with particle size and absorption spectral tunability might be utilized as solar energy absorber material.Karbon nanopartikel (C-Dots) disintesis menggunakan asam sitrat dan urea sebagai sumber karbon dan bahan bakar, melalui reaksi pembakaran sederhana. Spektrum absorpsi dan morfologi partikel C-Dots diinvestigasi menggunakan UV-Vis Spectrometry dan analisis SEM. Hasil SEM menunjukan bahwa morfologi partikel C-Dots sangat kecil (1 ?m) dan seragam. Selain itu, larutan C-Dots memiliki spektrum absopsi pada rentang sekitar 86% pada daerah cahaya tampak. Hasil studi ini menunjukan bahwa karbon nanopartikel (C-Dots) dengan ukuran partikel dan spektrum absorpsi yang dapat diatur, sehingga dapat digunakan sebagai material penyerap sinar matahari.
PEMBUATAN ELEKTRODA KARBON BERPORI DARI TEMPURUNG KEMIRI DAN PERANCANGAN PROTOTIPE SISTEM CAPACITIVE DEIONIZATION (CDI) UNTUK DESALINASI AIR PAYAU
Jurnal Pendidikan Fisika Indonesia Vol 11, No 1 (2015)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v11i1.4008

Abstract

Telah dilakukan pembuatan karbon aktif dengan bahan dasar tempurung kemiri menggunakan H3PO4 2,5% sebagai aktivator dengan suhu aktivasi (400, 500, dan 600) oC.Luas permukaan aktif yang dihasilkan masing-masing adalah (6,6; 95,6; dan 391,6) m2/g. Karbon yang diaktivasi pada suhu 600 oC digunakan sebagai bahan dasar pembuatan elektroda kapasitor untuk system capacitive deionization (CDI) menggunakan polimer polyvinyl alcohol (PVA) sebaga ipengikat. Berdasarkan data voltammogram siklik terhadap elektroda CDI diperoleh besar kapasitansi spesifik elektroda adalah 50,21 mF/g.  Proses desalinasi dilakukan pada larutanNaCl 0,24 M dengan menyusun elektroda menggunakan system monopolar dan diberitegangan DC 1,2 V.  Penurunan konduktivitas larutan NaCl menggunakan sistem CDI ini sebesar 61,58%, dengan penurunan kadar natrium dalam larutan NaCl yaitu dari 138,0 mg/L menjadi 80,7 mg/L  selama 40 menit. Karbon aktif tempurung kemiri ini sangat potensial untuk dikembangkan sebagai elektroda CDI untuk sistem desalinasi air payau.The writers had done the research of the activated carbon that prepared with the candlenut shell by using H3PO4 2,5% as the activating agent.  All samples were heated at the temperatures of (400, 500, and 600) oC.  The activated carbon have specific surface area (6.582; 95.623; and 391.567) m2/g respectively. Capacitor electrode for capacitive deionization (CDI) was fabricated by using activated carbon that was heated at activation temperature of 600 oC with polyvinyl alcohol (PVA) as the binder. Based on cyclicvoltammogram of electrode, specific capacitance of CDI electrode is 50.21 mF/g.  To observe desalination process of electrode, CDI was made by monopolar system and immersed in NaCl 0.24 M as brackish water sample.  Direct current voltage 1.2 V was applied to CDI cell.  The decreased of NaCl conductivity with CDI system respectively is 61.58%.  Sodium concentration in NaCl decreases from 138.000 mg/L to 80.667 mg/Labout 40 minutes of desalination process.The activated carbon that prepared from candlenut shell is potential to develop as CDI system for desalination of brakish water.
Influence of Problem Based Learning Model on Student Mental Models
Jurnal Pendidikan Fisika Indonesia Vol 16, No 1 (2020)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v16i1.14253

Abstract

The purpose of this study was to determine the development of mental models (MM) of students as well as to analyze the differences in MM based on the learning model used. This research is expected to be a guide for teachers in exploring the concept of physics as a whole. The study was conducted at the high school level with a medium level school category. The research method used mixed methods embedded experimental models with surface level, matching and deep (SMD) diagnostic test instruments. The results of the study showed that there were an increase on students’ MM at each meeting in the SMD level. Other results show that there are differences in the mean scores corrected between levels of the learning model. The mean score corrected PBL mental model is significantly different from conventional. The increase in MM students with PBL was higher than the increase in MM students with conventional learning. Thus, PBL can be recommended to increase MM students' physics of high school students.

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