Gede Wiratma Jaya, Gede Wiratma
Pendidikan Fisika, Universitas Mulawarman, Indonesia

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PENERAPAN PENDEKATAN SAINTIFIK MELALUI METODE EKSPERIMEN PADA PEMBELAJARAN FISIKA SISWA KELAS X MIA 3 SMA NEGERI 1 TENGGARONG (Materi Suhu dan Kalor) Jaya, Gede Wiratma; Patasik, Boas; Sembel, Eka K.R.N; Subagiyo, Lambang; Yunus, M.
Saintifika Vol 16, No 2 (2014)
Publisher : Jurusan Pendidikan MIPA FKIP Universitas Jember

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Abstract

Penerapan pendekatan saintifik melalui metode eksperimen merupakan pendekatan pembelajaran yang  menggunakan enam langkah pembelajaran ilmiah dipadukan dengan menggunakan metode eksperimen. Penelitian ini bertujuan untuk mengetahui keterampilan proses sains (KPS) siswa pada saat menerapkan pendekatan saintifik melalui metode eksperimen, dan untuk mengetahui hasil belajar Fisika siswa setelah diterapkan pendekatan saintifik melalui metode eksperimen. Jenis penelitian yang digunakan adalah penelitian yang bersifat pre-eksperimental one group pretest-posttest design. Teknik pengambilan sampel yang digunakan adalah  purposive sampling yaitu kelas  X MIA 3 sebanyak 33 orang.  Pengambilan data penelitian ini menggunakan teknik observasi  dan teknik tes. Dari hasil penelitian diperoleh besarnya nilai rata-rata pada masing-masing aspek KPS antara lain: (1) Aspek Mengamati sebesar 90,3; (2) Aspek menyusun hipotesis sebesar 82,7; (3) Aspek menjalankan percobaan (eksperimen) sebesar 86,9; (4) Aspek menyimpulkan sebesar 79,5; (5) Aspek mengkomunikasikan sebesar 82,1. Nilai rata-rata pre-test dan post-test masing-masing sebesar 50,3 dan 77,6 dengan nilai presentase N-Gain sebesar 54,9%.
CHARACTERISTICS OF DIELECTRIC BARRIER DISCHARGE (DBD) AS AN OZONE GENERATOR REACTOR Jaya, Gede Wiratma; Nur, Muhammad; Anggara, Andhika Dwi; Metungku, Nofrita Angelina; Kinandana, Andi Wibowo; Zahar, Intan; Zain, Alfatihatuz Zulfah
Jurnal Indonesia Emas PPI Dunia Vol 1 No 01 (2018): OISAA Journal of Indonesia Emas
Publisher : PPI Dunia

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Abstract

Ozone is a gas formed from three oxygen atoms that are highly reactive and unstable compared to oxygen. Ozone can be generated by using a dielectric barrier discharge (DBD) generator. To know the ability of DBD reactor in producing ozone performed a characterization. Characterization is done by measuring the electrical current, electrical voltage, observing the plasma discharge, charge mobility, and ozone concentration. In this research using DBD reactor derived from the development of research Teaching Industry of  Diponegoro University. DBD reactor containof pyrex glass material as a dielectric barrier and parabolic wire made of aluminum as inner and outside electrodes in the dielectric barrier. DBD reactor was generated using high AC voltage of 2, 4, 6, 8, 10 and 12 kV and air flow rate is 10 L/min. The characterization results show that the higher the voltage can results increases of electrical current, for a discharge plasma produces a purplish color as a result of ionization process on the electrode. The calculation of charge mobility is  and the lowest and highest ozone concentration is 80 ppm and 280 ppm, respectively. In the future, application of DBD reactor has been characterized can be usedfor ozone gas production as food preservatives, improvement of the environmental quality of aquaculture and as an industrial and medical waste treatment system.
Characteristics of Bolus Using Silicone Rubber with Silica Composites for Electron Beam Radiotherapy Astuti, Santi Yuli; Sutanto, Heri; Hidayanto, Eko; Jaya, Gede Wiratma; Supratman, Astri Suppa; Saraswati, Galih Puspa
Journal of Physics and Its Applications Vol 1, No 1 (2018): November 2018
Publisher : Journal of Physics and Its Applications

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Abstract

Bolus is a material that equal with the tissue and functions to increase the dose radiation in surface area in external radiotherapy, which uses electron beam. In this research, bolus was made using silicone rubber (SR) material, which was mixed with silicacomposites material. The bolus with a dimension of 12 x 12 x 0,5 cm3 was successfully made with a various amount of silica composite (2%, 4%, 6%). Bolus was then characterized using linear accelerator (LINAC) with an electron beam for percentage of surface dose (PSD) and using CT-Scan to measurement relative electron density (RED). The energy of electron beam used in this research was5 and 7 MeV. The result shows that RED value increased with increasing the amount of silica composite with higher RED value amounted to 1.186. PSD value increased with increasing the amount of silica composite, higher PSD value of energy in 5 and 7 MeV amounted 106.82% and 106.82% and 100.34%, respectively. The result certified that the silica composite material can increase the percentage of surface dose on electron beam radiotherapy.