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INDONESIA
Jurnal Pendidikan Fisika Indonesia
Published by Universitas Negeri Semarang
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education,
Education Physics
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Articles 553 Documents
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Analisis FTIR dan Minimum Loss pada Kaca Tellurite-Bismuth-Zinc-Plumbum untuk Aplikasi Fiber Optik Infrared -, Wahyudi; Marzuki, A.; -, Cari; Pramuda, A.
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.v10i1.3051

Abstract

Peneltian ini bertujuan menganalisis spektrum Fourier Transform Infra Red (FTIR) dan menentukan minimum loss dari kaca Tellurite-Bismuth-Zinc-Plumbum (TBZP) yang dipengaruhi oleh variasi (PbO). Kaca TBZP difabrikasi dengan teknik melt quenching dengan komposisi 55TeO2–2Bi2O3–[43-x]ZnO–xPbO (%mol) dengan x=2, 3, 4, 5. Hasil uji spektrum Fourier Transform Infra Red (FTIR) menunjukkan pita absorbsi terbesar berada pada panjang gelombang lebih dari 620nm. Absorbansi tersebut lebih diakibatkan oleh adanya transisi vibrasi pada daerah infrared. Minimum loss pada kaca TBZP diprediksikan secara teoritis melalui fitting data infrared edge dengan kurva Rayleigh scattering. Minimum loss kaca TBZP sebasar 2,94 dB/km hingga 2,35 dB/km pada λ=5534,2nm hingga 5821,2nm. Nilai minimum loss menurun seiring pertambahan konsentrasi ion Pb2+ dalam kaca TBZP. Sifat tersebut menjadikan kaca ini sebagai kandidat yang baik untuk aplikasi yang menggunakan gelombang infrared seperti fiber optik infrared. The aims of this research were to analyze the spectrum of Fourier Transform Infra Red (FTIR) and determine the minimum loss of Tellurite-Bismuth-Zinc-Plumbum (TBZP) based glass which affected by the variation of (PbO). The TBZP glass has been fabricated by melt quenching technique with composition 55TeO2–2Bi2O3–[43-x]ZnO–xPbO (mol%) with x=2, 3, 4, 5. Fourier Transform Infra Red (FTIR) spectra test results showed that the greatest absorption bands were at wavelengths over 620nm. Vibrational transition has the reason behind the absorbance in the infrared region. Minimum loss on glass TBZP theoretically was predicted by fitted data from the infrared edge and rayleigh scattering curve. The minimum loss of TBZP was of the range 2,94 dB/km to 2,35 dB/km at λ=5534,2nm to 5821,2nm. The minimum loss of TBZP glass decreases as the Pb2+ content in glass increases. This makes these glasses are good candidate for IR-application such as infrared optical fiber.
PENGARUH KARET ALAM SIKLIK (CYCLIC NATURAL RUBBER) TERHADAP RONGGA ASPAL MODIFIKASI Ritonga, W.; Irfandi, I.
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.v12i2.4389

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh karet alam siklik terhadap rongga aspal modifikasi. Tahapan peneltian meliputi pembuatan aspal modifikasi dengan menyampur aspal murni dengan karet alam siklik, pengujian persyaratan fisik aspal, pembuatan benda uji dan pengujian marshall. Berdasarkan pengujian sifat fisik aspal diperoleh data bahwa keseluruhan aspal modifikasi memenuhi persyaratan fisik aspal. Setelah pembuatan benda uji, dilakukan pengujian marshall untuk memperoleh rongga aspal meliputi VIM, VMA dan VFA. Nilai VIM pada penambahan 0 phr, 1 phr, 2 phr, 3 phr, dan 4 phr adalah 3,65%, 5,41%, 4,27%, 3,84%, dan 2,88%. Nilai VMA sebesar 15,52%, 17,26%, 16,07%, 15,80%, dan 15,17%. Nilai VFA sebesar 76,48%, 68,72%, 73,54%, 75,76%, dan 81,34%. Diperoleh kesimpulan bahwa karet alam siklik bisa dijadikan sebagai bahan memodifikasi aspal dan berpengaruh terhadap rongga aspal.This research aimed to determine the effect of cyclic natural rubber (CNR) to cavity of modified bitumen. The steps of the research were mixing the pure bitumen with CNR, testing bitumen physical requirement, making the specimen, and testing the cavity of modified bitumen with marshall method. Testing showed that all the modified bitumen met the physical requirement. After making specimen, marshall method was used to determine the cavity of bitumen, including VIM, VMA, and VFA. VIM in addition of 0 phr, 1 phr, 2 phr, 3 phr, and 4 phr was 3,65%, 5,41%, 4,27%, 3,84%, and 2,88%. The value of VMA was 15.52%, 17.26%, 16.07%, 15.80% and 15.17%. The value of VFA was 76.48%, 68.72%, 73.54%, 75.76% and 81.34%. The conclusion of this study was CNR could be used as material for bitumen modified and had the effect on bitumen cavity.
THICKNESS DEPENDENCE OF MAGNETIC SWITCHING DYNAMICS OF BARIUM-FERRITE AS A HIGH-DENSITY PERPENDICULAR MAGNETIC STORAGE MEDIA Aji, P. P.; Rondonuwu, F. S.; Wibowo, N. A.
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.v13i2.8499

Abstract

Micromagnetic study of material thickness dependence of Barium-ferrite nano-dot magnetization dynamics has been performed. The used materials characteristics in this research represent the properties of Barium-ferrite. Barium-ferrite was modeled as a nano-dot with a surface area of 50 × 50 nm2 and its thickness varies from 5 nm to 100 nm. This nano-dot was simulated using micromagnetic simulator software by solving Landau-Lifshitz-Gilbert equation. According to this study, obtained that the Barium-ferrite nano-dot has excellent thermal stability. Magnetization rate of this nano-dot decreases exponentially with the increase of thickness. The fastest magnetization rate observed in 5 nm of nano-dot thickness, meanwhile 45 nm for the slowest rate. Magnetization reversal mode of this Barium-ferrite nano-dot is dominated by domain wall nucleation and propagation. During the propagation of the domain wall, the exchange interaction becomes the main aspect compared to the other contributed energies.
PENGEMBANGAN MEDIA KAPASITOR DAN PENGARUHNYA TERHADAP PEMAHAMAN KONSEP DAN SIKAP ILMIAH SISWA Muhaimin, A.; Susilawati, S.; Soeprianto, H.
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.v11i1.4004

Abstract

Penelitian ini bertujuan untuk mengembangkan media pembelajaran materi fisika kapasitor pada tingkat Sekolah Menengah Kekuruan (SMK) kelompok teknologi berbentuk MTDK (media tiga dimensi kapasitor). Melalui tahap-tahap penelitian yang telah dilakukan, dihasilkan tiga model MTDK yaitu MTDK kertas, MTDK keping sejajar, dan MTDK rangkaian kapasitor. Keefektifan model MTDK yang dikembangkan, diujicoba pengaruhnya terhadap pemahaman konsep dan sikap ilmiah siswa SMK, dengan melibatkan 116 siswa SMK kelompok teknologi yang dibagi dalam dua kelas perlakuan, yaitu kelas eksperimen dan kelas kontrol. Untuk mengukur pemahaman konsep siswa dan sikap ilmiah siswa, digunakan instrumen tes pemahaman konsep dan instrumen tes sikap ilmiah. Data yang diperoleh dianalisis dengan uji beda rata-rata pada taraf signifikasi ()=0,05. Berdasarkan hasil analisis data, terdapat perbedaan nilai rata-rata pemahaman konsep dan sikap ilmiah siswa secara signifikan, dimana kelompok siswa kelas eksperimen mengungguli kelompok siswa kelas kontrol. Dengan demikian dapat disimpulkan bahwa penggunaan MTDK berpengaruh secara signifikan terhadap pemahaman konsep dan sikap ilmiah siswa SMK. This study aims to develop instructional media of physics capacitor learning for vocational technology student as three-dimensional media capacitor (Media Tiga Dimensi Kapasitor/MTDK). On the development stage, it resulted that MTDK models consisting of MTDK paper, MTDK parallel plate, and MTDK capacitor circuit. The testing stages of MTDK is to determine the effect of MTDK on vocational students’ understanding of concept and scientific attitude, it involved 116 students from SMK which are divided into two groups of treatment, the experimental group and the control group. Data were collected used understanding of concept test and scientific attitude test than analyzed by using mean-different test at the level of significance () = 0.05.  Based on the result of analysis, there are significantly differences in the average of students’ understanding of the concept and scientific attitude, where the experimental group was higher than the control group.  It can be concluded that MTDK significantly influence on vocational students’ understanding of concepts and scientific attitude.
ANALYSIS OF PROSPECTIVE PHYSICS TEACHERS’ FEEDBACK ON ONLINE PEER-ASSESSMENT IMPLEMENTATION Khusaini, K.
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.
STUDI PERBANDINGAN ANALISIS UNSUR PLUMBUM (PB) DARI HASIL ELEKTROLISIS ANTARA METODE LASER- INDUCED BREAKDOWN SPECTROSCOPY (LIBS) DENGAN METODE KONVENSIONAL Suyanto, H. S.; Manurung, M.; Sinaga, D.N.
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.v10i2.3454

Abstract

Penelitian ini bertujuan menganalisis unsur Pb hasil proses elektrolisis dengan metode alternatif laser-induced breakdown spectroscopy (LIBS) dan metode konvensional. Elektrolisis menggunakan tembaga (Cu) sebagai katoda dan karbon sebagai anoda. Unsur Pb yang terdeposisi pada katoda diirradiasi laser Nd-YAG (model CFR 200, 1064nm) dan emisinya (Pb I 405.7 nm) ditangkap spektrometer HR 2500++ yang kemudian ditampilkan dalam intensitas fungsi panjang gelombang. Hasil penelitian menunjukkan bahwa energi laser, arus listrik dan waktu deposisi proses elektrolisis yang optimum untuk karakterisasi unsur Pb masing - masing adalah 100 mJ, 5,28 mA dan 15 menit. Aplikasi metode ini untuk analisis kuantitatif larutan Pb dengan membuat kurva kalibrasi dari kosentrasi 300 ppm sampai kosentrasi terendah yaitu 0,5 ppm, serta diperoleh deteksi limit sebesar 0,44 ppm. Sebagai perbandingan metode deteksi dengan LIBS ini telah dilakukan analisis dengan metode konvensional dengan menentukan selisih massa katoda sebelum dan sesudah elektrolisis dan diperoleh hasil yang sebanding.ABSTRACTThe aim of this research was to compare between a method of laser-induced breakdown spectroscopy (LIBS) and the conventional one to analyse of Plumbum (Pb) element resulted from electrolysis process. Electrolysis used copper (Cu) and carbon (C) as cathode and anode respectively. Plumbum element which was deposited on cathode was irradiated by Nd-YAG laser (model CFR 200, 1064nm) and its emission intensity of neutral Pb I 405.7 nm in the plasma was captured by HR 2500++ spectrometer and displayed in a form of intensity as a function of wavelength. The experiment result showed that the optimum condition parameters of electrolysis: laser energy, electric current and electrolysis time duration were 100 mJ, 5.28 mA and 15 minutes respectively. An application of these conditions was done to make calibration curve of Pb element in liquid sample from 300 ppm to 0.5 ppm and resulted a limit of detection (LOD) of 0.44 ppm. As a comparison of this method, the weighed the mass of the cathode (Cu) before and after electrolysis had been calculated by conventional method. The data showed that these two methods are proportional.
SYNTHESIS AND OPTIMIZATION OF CARBON NANOPARTICLES (C-DOTS) AS ABSORBER MATERIALS FOR SOLAR DISTILLATION APPLICATIONS Nuryadin, B. W.; Qulsum, U.; Mahen, E. C. S.; Nuryantini, A. Y.; Aliah, H.; Perkasa, Y. S.
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.
Sintesis dan Karakterisasi Material Nanokomposit CNT/MnO2 Untuk Aplikasi Material Superkapasitor Subagio, A.; -, Priyono; -, Pardoyo; Yudianti, R.
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.v10i1.3056

Abstract

Telah dilakukan fabrikasi material nanokomposit CNT/MnO2 sebagai material elektroda superkapasitor dengan reaksi redox antara CNT dan KMnO4. Variasi komposisi dari kedua bahan tersebut dilakukan untuk mengetahui sifat struktur, morfologi dan kelistrikannya dengan perbandingan massa CNT/MnO2 sebesar 0, 25, 50 dan 75%. Pola struktur kristal dan morfologi dari material serbuk nanokomposit CNT/MnO2 dikarakterisasi dengan X-ray diffraction (XRD), scanning electron microscope (SEM) dan transmission electron microscope (TEM), sedangkan pola ikatannya dikarakterisasi dengan FTIR. Serbuk nanokomposit CNT/MnO2 ini selanjutnya dibuat pellet berbentuk silinder berukuran diameter 1 cm dan ketebalan 2 mm dengan variasi penambahan pengikat polyvinylidene difluoride (PVDF) sebesar 10, 20 dan 30% dari campuran CNT/MnO2. Pellet dari material CNT/MnO2 ini selanjutnya dipanaskan pada temperatur 70 oC selama 1 jam. Hasil pengukuran resistansinya menunjukkan bahwa material CNT/MnO2 dengan perbandingan massa CNT/MnO2 sebesar 75% dan penambahan pengikat PVDF sebesar 20% menunjukkan nilai resistansi yang paling rendah. Selanjutnya prototip superkapasitor CNT/MnO2 dengan menggunakan PVDF sebesar 20% diukur dengan metode electrochemical impedance spectroscopy menghasilkan nilai kapasitansi spesifik sebesar 7,86 F/gr. Nanocomposite materials CNT/MnO2 have been fabricated as candidate of supercapacitor electrode material with a redox reaction between CNT and KMnO4. Variations in the composition of the two materials were carried out to determine the structure, morphology and electrical properties of CNT/MnO2 with mass ratio of 0, 25, 50 and 75 %. Pattern of the crystal structure and morphology of the CNT/MnO2 nanocomposite powder were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM), while the bond pattern was characterized by FTIR. CNT/MnO2 nanocomposite powder was managed to make cylindrical pellets with diameter of 1 cm and thickness of 2 mm with variations addition of binder polyvinylidene difluoride (PVDF) of 10, 20 and 30%. Pellets of the material were then heated at a temperature of 70 oC for 1 hour. Resistance measurement results showed that the ratio of the mass of material CNT/MnO2 by 75% and additions by 20% PVDF binder showed the lowest resistance value. Furthermore, CNT/MnO2 supercapacitor prototype using PVDF of 20% measured with electrochemical impedance spectroscopy method showed specific capacitance of 7.86 F/gr.
Penerapan Model Pembelajaran Conceptual Understanding Procedures untuk Meningkatkan Curiosty dan Pemahaman Konsep Siswa Ismawati, F.; Nugroho, S. E.; Dwijananti, P.
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.v10i1.3047

Abstract

Penelitian ini bertujuan untuk mengetahui keefektifan model pembelajaran Conceptual Understanding Procedures (CUPs) serta meningkatkan pemahaman konsep dan curiosity siswa pada pelajaran fisika. Penelitian ini merupakan penelitian eksperimen, dengan desain kelompok eksperimen dan kelompok kontrol, menggunakan metode eksperimen, pretest-posttest control group design. Untuk mengetahui peningkatan pemahaman konsep dan curiosity digunakan tes, angket, dan observasi. Uji gain untuk mengetahui peningkatan pemahaman konsep dan peningkatan curiosity, uji-t satu pihak (pihak kiri) untuk menguji keefektifan model pembelajaran CUPs. Hasil penelitian menunjukkan peningkatan pemahaman konsep pada kelas eksperimen diperoleh sebesar 0,67 dan kelas kontrol sebesar 0,58. Peningkatan curiosity pada kelas eksperimen diperoleh sebesar 0,21 dan kelas kontrol sebesar 0,20, dan dapat disimpulkan bahwa model pembelajaran CUPs terbukti lebih efektif untuk meningkatkan pemahaman konsep dan curiosity siswa pada pelajaran fisika. The purposes of this research were to determine effectiveness of Conceptual Understanding Procedures (CUPs) in enhancing students’ conceptual understanding and curiosity in physics. This research used experimental method by conducting pretest-posttest control group design. The data were obtained by using paper and pencil test, questionnaires, and observations to determine students’ improvement in understanding the concept and curiosity. Therefore, the data were analyzed by using gain test and t-test. The obtained gain of conceptual understanding in experiment group was 0.68 and control group was 0.58. Meanwhile, the obtained gain of curiosity in experiment group was 0.21 and control group was 0.20. The result of hypothesis testing about students’ improvement of conceptual understanding and curiosity showed that Ho was accepted and Ha was rejected. Based on data analysis, it can be inferred that the CUPs is more effective in improving students' understanding of concepts and curiosity in physics.
THE POROSITY CALCULATION OF VARIOUS TYPES OF PAPER USING IMAGE ANALYSIS Astuti, N. H.; Wibowo, N. A.; Ayub, M. R. S. S. N.
Jurnal Pendidikan Fisika Indonesia Vol 14, No 1 (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.v14i1.9878

Abstract

The paper porosity study has been done by observing microscopically.The purpose is provide airborne porosity data on various paper types, so that we can rank the ability of liquid absorption on the same paper type. This porosity analysis is done by using ImageJ, with converting the image to binary, set the threshold limit, and clarify the watershed limit. The result of the porosity of filter paper A=51,50586 , B=18,30719 ,C=21,68076 ,D=29,72028 ; tissue paper A=9,174071 ,B=20,96931 ,C=32,76454 ; HVS paper A=23,31616 ,B=27,70944 . So it can be concluded that the ability of filter paper absorption A > filter paper D > filter paper C > filter paper B. Absorption ability tissue paper C > tissue paper B > tissue paper A. Absorption ability HVS B paper > HVS paper A. In general can be inferred that the higher the porosity value of the paper the greater ability to absorb liquids on paper.

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