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All Journal KALAM CENDEKIA PGSD KEBUMEN Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Pengajaran MIPA Jurnal Teknik Elektro Jurnal Pengajaran Matematika dan Ilmu Pengetahuan Alam Telaah Health Notions Jurnal Notariil Makara Journal of Science
Isnaeni Isnaeni
Universitas Negeri Semarang
Astronomy Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Health Professions Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health

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MENINGKATKAN KEMAMPUAN KOMUNIKASI DAN DISPOSISI MATEMATIK SISWA SEKOLAH MENENGAH ATAS MELALUI PEMBELAJARAN GENERATIF Isnaeni, Isnaeni; Maya, Rippi
Jurnal Pengajaran MIPA Vol 19, No 2 (2014): JPMIPA: Volume 19, Issue 2, 2014
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v19i2.36175

Abstract

ABSTRAKPenelitian ini merupakan suatu kuasi eksperimen berdesain pretes-postes kelompok kontrol dengan tujuan menelaah kemampuan komunikasi, dan disposisi matematik siswa melalui pembelajaran generatif. Laporan ini adalah bagian dari penelitian tesis dengan subyek penelitian sebanyak 70 siswa kelas X dari satu SMA Negeri di Cimahi. Instrumen penelitian terdiri dari satu tes uraian komunikasi matematik, dan satu skala disposisi matematik. Penelitian menemukan bahwa kemampuan komunikasi siswa yang memperoleh pembelajaran generatif mencapai mutu yang cukup baik dan itu lebih baik daripada mutu siswa yang memperoleh pembelajaran konvensional. Namun penelitian ini juga menemukan tidak ada perbedaan disposisi matematik siswa pada kedua pembelajaran dan disposisi matematik siswa telah tergolong cukup baik. Selain itu, penelitian ini juga menemukan terdapat asosiasi antara kemampuan komunikasi matematik, dan disposisi matematik, serta siswa menunjukkan persepsi yang baik terhadap pembelajaran generatif. ABSTRACTThis paper reported the findings from a pretest-postest experimental control group design conducted in 2014 by using generative teaching-learning to investigate students’ mathematical communication ability and mathematical disposition. This report was a part of a master thesis that involved 70 tenth grade students from a senior high school in Cimahi. The instruments of the study were an essay mathematical communication test, a mathematical disposition scale, and a students’ perception toward generative teaching-learning scale. The study found that in terms of mathematical communication ability, the grade of students taught by generative teaching-learning was better than the grade of students taught by conventional teaching. However, in terms of mathematical disposition there were no grades difference between students taught by generative teaching-learning and students taught by conventional teaching, and those grades were fairly good. Moreover, students’ perception to generative teaching-learning was good and there was association between mathematical communication and mathematical disposition.
Assisted Surface-state Recombination of Orange-peel Carbon Nanodots in Various Matrices Fatimah, Siti; Isnaeni, Isnaeni; Tahir, Dahlang
Makara Journal of Science
Publisher : UI Scholars Hub

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Abstract

The contentious origin of the luminescence of carbon nanodots (CDs) has attracted considerable attention. In this work, we synthesized CDs from orange peel by using a microwave-assisted technique. We investigated the optical properties of the synthesized CDs. Moreover, we studied the effect of matrix addition on the optical properties of CDs. We found that matrix addition significantly influences the absorbance and photoluminescence of CDs. Shifts in absorbance peak intensity and emission peak wavelength indicated that the bonding of matrix molecules on the surfaces of the CDs has changed the structures of CDs. This finding is supported by the extended half-life of CDs after matrix addition. Our results will expand researchon the use of CDs as phosphorescent materials.
Optical Properties of Toluene-soluble Carbon Dots Prepared from Laser-ablated Coconut Fiber Isnaeni, Isnaeni; Suliyanti, Maria Margaretha; Shiddiq, Muhandis; Sambudi, Nonny Soraya
Makara Journal of Science Vol. 23, No. 4
Publisher : UI Scholars Hub

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Abstract

In this study, we used laser ablation to fabricate toluene-soluble carbon nanoparticles from coconut fiber. In response to excitations at various wavelengths, the fabricated carbon nanoparticles exhibit three distinctive emission peaks at wavelengths of 300 nm, 440 nm, and 540 nm. These three emission peaks correspond to the  orbital state,  orbital state, and surface state, respectively. Photoluminescence excitation measurements indicate a high probability of energy transfer between the surface state and  orbital state, whereas the  orbital state is likely independent of the other states. The results of time-resolved photoluminescence measurements indicate that electrons are likely to remain longer in higher-energy states. Given that the carbon dots fabricated in this study were made from natural resources, these findings may find application in photonic devices that feature tunable emissions.
Co-Authors Achmad Basori, Achmad Ali Imran Budi Utomo Dahlang Tahir Eddy Bagus Wasito Esti Hendradi Hakimi, Ahmad Reza Kartuti Debora, Kartuti Lestari, Ismira Wahyu Mahmudah, Rifaatul Maria Margaretha Suliyanti Mulyawan, Reynaldi Gilang Nurhasanah, Wahidatun Dewi Rippi Maya Sambudi, Nonny Soraya Shiddiq, Muhandis Siti Fatimah Sutarno Sutarno Tejo Faridh Waloyo