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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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RADIATION SAFETY ANALYSIS OF NEUTRON COLIMATOR BASED ON NICKEL MATERIAL FOR PIERCING RADIAL BEAMPORT UTILIZATION OF KARTINI RESEARCH REACTOR
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.v12i2.4937

Abstract

Radiation safety analysis of nickel material neutron colimator (as requirement) for pearcing radial beamport utilization of Kartini research reactor has been done before the neutron colimator instaled. The neutron collimator made of nickel material with cyllindrical geometry which is 156 cm length. The Inside and outside diameter are 16 cm and 19 cm respectively with mean cyllindrical thickness is 1.5 cm. Irradiation process to the neutron collimator begin when the reactor beeing operated for 6 (six) hours per day and assumed optimum at 100 kW power level. Results of the analysis showed that gamma dose rate which was generated by collimator at a distance of 50 cm from the end of the collimator is 1.5328e-03 mr/hours. The dose rate is still below the dose limit value which was required by Nuclear Energy Regulatory Agency (BAPETEN) is 1 mr/hours. It can be concluded that utilization neutron colimator of nickel material which installed at the radial pierching beamport of Kartini Reactor is safelly.Telah dilakukan kajian analisis keselamatan paparan radiasi terhadap kolimator neutron (sebagai persyaratan) sebelum dipasang pada beamport tembus radial reaktor kartini. Kolimator neutron terbuat dari bahan nikel berbentuk silinder panjang 156 cm dengan diameter dalam 16 cm dan diameter luar 19 cm sehingga tebal silinder 1.5 cm. Proses iradiasi terhadap kolimator neutron terjadi pada saat reaktor dioperasikan pada suatu daya dan diasumsikan optimal pada daya 100 kw selama 6 jam dalam satu hari. Hasil analisis menunjukan laju dosis gamma yang dihasilkan kolimator pada jarak 50 cm dari ujung kolimator sebesar 1.5328e-03 mr/jam. Laju dosis tersebut masih dibawah nilai batas dosis yang ditetapkan oleh bapeten sebesar 1 mr/jam, sehingga penggunaan kolimator tersebut dalam batas aman
VARIASI SUHU DEPOSISI PADA STRUKTUR, SIFAT OPTIK DAN LISTRIK FILM TIPIS SENG OKSIDA DENGAN DOPING GALIUM (ZNO:GA)
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.v11i1.4007

Abstract

Telah dilakukan deposisi film tipis ZnO:Ga di atas substrat kaca korning pada tekanan deposisi 500 mtorr dengan metode DC-magnetron sputtering. Film ditumbuhkan masing-masing pada suhu 325oC, 375oC, dan 425oC. Struktur, sifat optik dan sifat listrik film tipis yang dideposisikan telah dikarakterisasi dengan menggunakan EDX, XRD, SEM, spektrofotometer UV-Vis dan I-V Meter. Analisis EDX menunjukkan bahwa film yang terdeposisi merupakan film tipis ZnO:Ga. Hasil analisis struktur dengan XRD menunjukkan bahwa film tipis ZnO:Ga yang dideposisikan merupakan polikristalin dengan struktur heksagonal wurtzite. Film ZnO:Ga yang dideposisikan pada suhu 325o mempunyai kualitas kristal yang lebih baik dibandingkan dengan film yang dideposisikan pada suhu 375o dan 425oC. Hasil XRD juga terkonfirmasi dengan observasi SEM menunjukkan bahwa film ZnO:Ga yang dideposisikan pada suhu 325oC mempunyai ukuran butir yang lebih homogen dibandingkan dengan film yang ditumbuhkan pada suhu deposisi 375o dan 425oC. Film tipis ZnO:Ga yang ditumbuhkan pada suhu 325oC mencapai transmitansi optik ~ 89% dan energi bandgap ~3,33 eV. Sifat listrik dapat diketahui dengan menggunakan I-V Meter yang menunjukkan nilai  1,74 x10ˉ3 (Ωcm)ˉ1 pada suhu deposisi 325oC. Thin films ZnO:Ga were deposited on corning glass substrates with argon gas pressure 500 mtorr and variation temperature at 325oC,  375oC and 425oC by DC-Magnetron Sputtering. The structural studies, optical and electricity properties of the thin films have been investigated by means of EDX, XRD, SEM, Uv-Vis spectroscopy and I-V meter. The EDX result show that thin films were deposited is ZnO:Ga thin films. The structural studies result from XRD show the ZnO:Ga thin films deposited have polycrystalline with the hexagonal wurtzite structure. ZnO:Ga film were deposited at 325oC have the better quality crystal with the other. The XRD result also appropriate with SEM, it was shown at 325oC has grain size more homogeny with the other films. Thin films ZnO:Ga was deposited at 325oC has the optical transmittance ~89% and the bandgap ~3,33 eV. Electrical conductivity 1.74 x10ˉ3 (Ωcm)ˉ1 at deposited  325oC. 
Underground Water-Level Monitoring by Integrated Study of Geoelectric, Logging, Cutting and Pumping Data in Industrial Area of Candi Sub-District, Sidoarjo
Jurnal Pendidikan Fisika Indonesia Vol 15, No 2 (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.v15i2.14365

Abstract

Monitoring of underground water level with integrated data of geoelectric, logging, cutting and pumping has been done in industrial area of Candi Sub-district, Sidoarjo, which is productive aquifers with widespread area. The integrated study showed that monitoring aquifers in industrial wells has carried out at depths of 140-165 meters. The lithology of the aquifer layer consists of sand layer, clay, and gravel with a low resistivity value of 14.7 to 46.8 ohmmeters. The monitoring results showed that the use of underground water at night was higher than the day and the use on workday was higher than on holiday. The stable debit generated by monitoring wells was 8.41 lt/sec and the groundwater level would return to stable 2.17 meters if the well is rested for 3 hours. The implication of this study was monitorable of the dynamics underground water levels periodically.
Pengembangan Uji Kompetensi Mandiri Berbasis Komputer Untuk Meningkatkan Efikasi Diri Siswa
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.v10i1.3045

Abstract

Contoh penerapan teknologi dalam pendidikan adalah Computer Based Testing (CBT). Efikasi diri adalah keyakinan seseorang untuk menyelesaikan tugas. Uji Kompetensi Mandiri merupakan untuk menguji kompetensi siswa secara mandiri. Tujuan penelitian menghasilkan produk UKM, menentukan kepraktisan dan efektivitas UKM. Metode penelitian Research and Development. Subjek penelitian siswa kelas VIII SMP 2 Demak tahun 2012/2013. Desain penelitian adalah One group pretest-posttest study. Efikasi diri diukur melalui pretest dan posttest, sebelum dan sesudah perlakuan pembelajaran dengan UKM. Pengembangan UKM dengan menguji vaiditas, kepraktisan dan keefektifan. Karakteristik UKM yang dapat meningkatkan efikasi diri adalah: (1) memiliki tingkat kesukaran soal, (2) memiliki bantuan materi, (3) menyesuaikan gaya pembelajar modern, (4) mendorong terjadinya pengalaman vikarius. Keefektifan dilihat pada peningkatan efikasi diri siswa. Rerata pencapaian efikasi diri sebelum dan sesudah perlakuan adalah 76,6% dan 82,9%. Pencapaian efikasi diri siswa ini termasuk dalam kategori tinggi. The example of technolgy in education application is Computer Based Testing (CBT). Self-efficacy is the ability of someone to complete the task. Uji Kompetensi Mandiri (UKM) aims to test student competency independently. The research objectives are to produce UKM, determine the practicality and effectivity of UKM. The Research methode is Research and Development method. Subjects were the students of grade VIII of SMP 2 Demak in academic year of 2012/2013. The Research design is one group pretest-posttest study. Students' self-efficacy was measured by pretest and posttest that measured before and after a treatment by using UKM in a learning program. The development of UKM is done by validity, practicality and effectiveness tests. UKM’s characteristics that can enhance students' self-efficacy are: (1) have difficulty level, (2) have learning material assistance, (3) adapting to modern learner style, (4) easy to integrated in the learning experience to stimulate discussion and vicarious experiences.. The averages of students’ self-efficacy before and after the treatment are 76.6% and 82.9%. These achievements are categorized into high category.
THE EFFECT OF ELECTRO MAGNETIC FIELD INTENSITY TO BIODIESEL CHARACTERISTICS
Jurnal Pendidikan Fisika Indonesia Vol 13, No 2 (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.v13i2.9477

Abstract

Various studies of diesel fuel optimization have been done, one of them by using a permanent magnet on the fuel line, the lack of magnetic field intensity decreases along with time increasing by using an electromagnetic field. The purpose of this study is to analyse the biodiesel fuel characteristics due to exposure of electromagnetic fields in terms of the viscosity and vibration of these fuel molecules. Electromagnetic field is generated from wire coil of 5000-9000 on galvanum pipe with diameter of 1.5 cm and length of 10 cm and connected to 12 V batteries. Here, biodiesel fuel is inserted in a galvanum tube, magnetized for 1200 s, and tested its viscosity of the falling ball system by viscometer. Fuel functional groups as well as vibrations between fuel molecules are tested with FTIR. The results show that the magnetized fuel changes. The viscosity of fuels from 2933 to 2478 and an increasing in the absorption of fuel molecules ranges from 13-58%. Therefore, the increasing of vibrating fuel molecules decreases its molecular attraction tug. These indicate that the magnetized fuel molecule causes a changing in the fuel molecule, cluster becomes de-clustered. It is a potential method to clarify the phenomenon of fuel magnetization due to its efficient combustion process.
ZERO-FIELD NUCLEAR MAGNETIC RESONANCE FOR STUDY OF ANTIFERROMAGNETIC PROPERTIES OF FeF3 MATERIALS
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.v12i1.3688

Abstract

Nuclear Magnetic Resonance (NMR) has been used as a research tool in many fields. In this study, the magnetic properties, especially anti-ferromagnetic properties of FeF3 materials were investigated. Zero-field custom-built NMR method was used to investigate the anti-ferromagnetic properties in the materials. Experiments have been carried out by varying the sample temperatures from 8 K to 220 K. Ordinary spin echo pulse sequence 90⁰RF–τ–180⁰RF were used. Using Fast Fourier Transform, the signals in NMR spectrum were analyzed and the peak showed the resonance frequency. The result showed that resonance frequencies decrease with increasing in temperature. The frequency of the spectrum was around 85.41 MHz in the zero-temperature limit, and this corresponds with Fe hyperfine field at zero-temperature limit was 2.14 T. The temperature dependence of the local magnetization does not fit T2 Bloch’s Law very well. Instead, it fits the exponential form having an energy gap in the dispersion relation of the spin wave. It is obtained from the result that FeF3 is antiferromagnetic materials with energy gap of 11.466 meV and anisotropy energy of 1.045 meV.Nuclear Magnetic Resonance (NMR) telah banyak digunakan sebagai “research tool” pada berbagai bidang kajian di fisika. Pada studi ini, akan dilakukan eksperimen untuk menguji sifat magnetik, khususnya antiferromagnetik pada material FeF3. Telah dilakukan eksperimen dengan memvariasikan temperatur pada sampel dari 8 K hingga 220 K. Pulse sequence yang digunakan adalah 90⁰RF–τ–180⁰RF. Dengan memanfaatkan Fast Fourier Transform, sinyal echo ini dapat dianalisis dalam bentuk spektrum NMR dengan puncak spektrum menunjukkan frekuensi resonansinya. Diperoleh bahwa frekuensi resonansi akan menurun seiring dengan kenaikan temperatur. Posisi frekuensi pada temperatur 0 K adalah sebesar 85,41 MHz, hal ini memperlihatkan bahwa medan hyperfine dari Fe sebesar 2,14 T pada temperatur 0 K. Kurva antara frekuensi resonansi dengan temperatur menunjukkan bahwa magnetisasi tidak tepat sebanding dengan hukum Bloch T2 namun lebih cocok dengan bentuk persamaan eksponensial yang berkaitan dengan suatu gap energi yang berasal dari dispersi spin wave. Hal ini menguatkan bahwa bahan FeF3 merupakan bahan yang bersifat antiferromagnetik, namun bukan antiferromagnetik sederhana. Berdasarkan fitting, diperoleh gap energi sebesar 11,466 meV dan energi anisotropi sebesar 1,045 meV.
DEVELOPING LOCAL WISDOM BASED SCIENCE LEARNING DESIGN TO ESTABLISH POSITIVE CHARACTER IN ELEMENTARY SCHOOL
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.v11i1.3998

Abstract

This study aims to design a science learning program based on the local wisdom and apply it in elementary school. Mixed method research was use to gain the significance improvement from the design. There were 35 elementary science teachers from 16 elementary schools chosen by using purposive random sampling. The previous research revealed that there are about 80% of the teachers who were recognized the local wisdoms in their environment, but none of them have a capability to use it as a part of their science program in the classroom. To overcome this constrain, Review(R), Task(T), Solution(S), Reflection(R), and Evaluation(E) design was proposed in elementary school science learning. By implementing the design in two elementary schools, 11 positive characters expected were indicated from students’ performance. But characters of honest, disciplined, conscientious, diligent, careful, responsibility, and caring environment, are most significant. Tujuan dari penelitian ini adalah mengembangkan desain pembelajaran sains berbasis kearifan lokal pada tingkat sekolah dasar. Metode penelitian campuran (mixed method) digunakan untuk melihat signifikasi capaian pengembangan desain. Penelitian ini melibatkan 35 guru dari 16 sekolah dasar yang dipilih secara acak dari sekolah-sekolah yang memenuhi kriteria yang telah ditetapkan. Dari penelitian sebelumnya diperoleh hasil bahwa sekitar 80% dari sampel telah mengenali kearifan lokal di lingkungan sekolah masing-masing. Namun, tidak satupun dari sampel yang memiliki kapasitas untuk mengaplikasikan kearifan lokal tersebut ke dalam kurikulum sains mereka. Untuk mengatasi kendala ini, maka digagaslah desain Review(R), Task(T), Solution(S), Reflection(R), dan Evaluation(E) ini. Dua sekolah dipilih secara purposive sampling sebagai kelas eksperimen. Dengan mengkombinasikan dari kualitatif hasil RnD desain dan data kuantitatif nilai tes, diperoleh informasi bahwa 11 karakter positif terindikasi pada performan siswa. Dari kesebelas karakter tersebut, kejujuran, keingintahuan, jujur, hati-hati, tanggung jawab, dan peduli lingkungan yang paling meningkat secara signifikan.  
Spooky Birds and Origin of Life: A Quantum Mechanics Description of Bird Migration
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.v15i1.13920

Abstract

In this work we explain a strange quantum phenomenon in biology that the European Robin uses to navigate. The bird’s brain contains a chemical called cryptochromes which has two of its electrons entangled through collision with photons. These two electrons hop between singlet and triplet states. This hopping is sensitive to the earth’s magnetic field causing different signals to be transferred to its brain. It is believed that these birds use quantum entanglement for their navigations. We also discuss the importance of this phenomenon in trying to find the origin of life. We also explain the view of some who believe that quantum field is well entrenched in the origin of life and that we have to look for a quantum self-replicator that can repeat itself.Hasil penelitian ini mencoba menjelaskan fenomena kuantum yang aneh pada ranah biologi dimana burung robin eropa bernavigasi menggunakannya. Otak burung tersebut mengandung material kimia yang disebut dengan cryptochromes yang mempunyai dua buah elektron yang terjebak dalam pengaruh interaksi tumbukan antara elektron tersebut dengan foton. Dua elektron tersebut melompat di antara keadaan singlet dan triplet. Lompatan ini dipengaruhi oleh medan magnetik bumi yang memberikan sinyal berbeda-beda untuk ditransfer ke otaknya. Burung-burung ini diyakini menggunakan prinsip pengaruh kuantum untuk navigasinya. Kami juga mengungkap pentingnya fenomena ini dalam usaha mencari asal mula kehidupan. Kami juga menjelaskan sudut pandang yang mempercayai bahwa medan kuantum diyakini berperan penting dalam penjelasan tentang asal mula kehidupan dan bahwa kita harus mencari tahu tentang pembelahan materi dengan pengaruh kuantum yang dapat berlangsung berulang-ulang dengan sendirinya.
PENGEMBANGAN PERANGKAT PERKULIAHAN EKSPERIMEN FISIKA UNTUK MENINGKATKAN KREATIVITAS MAHASISWA CALON GURU DALAM MENDESAIN KEGIATAN PRAKTIKUM FISIKA DI SMA
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.v10i2.3448

Abstract

Penelitian ini bertujuan untuk mengembangkan perangkat perkuliahan eksperimen fisika yang dapat meningkatkan kreativitas mahasiswa calon guru dalam mendesain kegiatan praktikum fisika SMA. Mixed methods research melalui embedded experimental model dengan strategi embedded, digunakan sebagai metode penelitian sebagai tahap pengumpulan data kuantitatif dan kualitatif dalam satu waktu; yang melibatkan mahasiswa program studi Pendidikan Fisika salah satu LPTK di Maluku. Perangkat perkuliahan yang dikembangkan diadaptasikan dari pola pembelajaran kreatif yang disebut sebagai Aspek Keterampilan Berpikir Kreatif (AKBK); aktivitas mahasiswa dalam mendesain kegiatan praktikum diarahkan pada Indikator Kegiatan Dalam Bereksperimen (IKDB). Pemahaman konsep fisika mahasiswa diukur berdasarkan taksonomi Bloom revisi. Hasil penelitian menunjukkan, terjadi peningkatan AKBK mahasiswa untuk setiap IKDB pada kriteria sedang; serta peningkatan pemahaman konsep-konsep dasar fisika mahasiswa untuk indikator mencontohkan, mengklasifikasikan, dan menjelaskan pada kriteria sedang. Disimpulkan bahwa perangkat perkuliahan eksperimen fisika yang dikembangkan dapat meningkatkan kreativitas mahasiswa dalam mendesain kegiatan praktikum fisika berdasarkan cakupan materi yang terukur.ABSTRACTThis study aimed to develop the lectures instrument of physics experiment to improve the creativity of preservice teachers in designing a high school physics lab activities. Mixed methods research through the embedded experimental models with embedded strategy, was used as a method of research, a stage of quantitative and qualitative data collection at a time, involving students of Physical Education courses one LPTK in Maluku. The developed lectures instrument adapted from creative learning pattern was referred to as Creative Thinking Skills aspect (CTSA), while student activity in the design of practical activities were directed at Activity Indicator In Experiment (SIEI). Understanding the concept of physics students was measured based on the revised Bloom's taxonomy. The results showed an increase in students CTSA for each SIEI on the criteria of being; as well as an improve understanding of the basic concepts of physics students to cite, classify, and explain indicators. It was concluded that the developed lectures instrument of physics experiment can enhance student creativity in the design of physics experiment activities based on the coverage of the measured material.
Seismic Hazard and Microzonation Study of Tanjung Region, North Lombok (Indonesia) using Microtremor Measurement
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.v14i2.9919

Abstract

Tanjung Region is one of the severely damaged areas by the Lombok earthquake on June 22, 2013. Therefore, to anticipate the similar events, it is necessary to perform microzonation in this region. Objective of this study is to map the distribution of the physical quantities related to the vulnerability of area included the frequency characteristics, amplification factor, and soil vulnerability index. The results showed that the value of the resonant frequency in this region ranged from 0.401 to 16.92 Hz. In general, the lower frequency was 0.40 to 5.91 Hz contained 87 data (71%) were located in the north of the region, which meant that that area has a high vulnerability. While based on the H/V amplitude and vulnerability index, the zone that suffered severe damage on the earthquake of June 22, 2013, showed a different uncertainty of amplification and vulnerability index value.Wilayah Tanjung adalah salah satu daerah yang mengalami rusak parah akibat gempa Lombok pada tanggal 22 Juni 2013. Oleh karena itu, untuk mengantisipasi kejadian serupa, maka perlu untuk melakukan mikrozonasi di daerah tersebut. Tujuan dari penelitian ini adalah untuk memetakan distribusi besaran fisis yang terkait dengan kerentanan suatu daerah terhadap gempa bumi yang meliputi frekuensi respon, amplitudo getaran tanah dan indeks kerentanan tanah. Hasil penelitian menunjukkan bahwa nilai frekuensi resonansi di wilayah ini berkisar antara 0,401-16,92 Hz. Secara umum, frekuensi respon di daerah ini rendah yaitu 0,40-5,91 Hz dengan jumlah 87 data (71%) yang terletak di utara dari wilayah tersebut, yang berarti bahwa bagian utara wilayah memiliki kerentanan yang tinggi. Meskipun berdasarkan nilai amplitudo H/V dan indeks kerentanan, daerah yang mengalami kerusakan parah saat gempa 22 Juni 2013 menunjukkan pola amplifikasi dan indeks kerentanan yang sangat tidak biasa.

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