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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 13 Documents
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Search results for , issue " Vol 10, No 1 (2014): January 2014" : 13 Documents clear
Pengembangan Uji Kompetensi Mandiri Berbasis Komputer Untuk Meningkatkan Efikasi Diri Siswa -, Sudar; Yulianto, A.; -, Wiyanto
Jurnal Pendidikan Fisika Indonesia Vol 10, No 1 (2014): January 2014
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, Semarang State University

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.
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): January 2014
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, Semarang State University

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.
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): January 2014
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, Semarang State University

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.

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