An Investigation into the Use of the Concept Attainment Model in Teaching the “Periodic Table” at ‘O’-Level Through an Action Research

This study aims at improving students’ achievement in reading comprehension applying The Concept Attainment Model by conducting classroom action research. The subjects of this research the first semester students Majoring in Economics from Yayasan Universitas Labuhan Batu Rantauprapat. The number of the students was 20 students. There were two kinds of data collected during the study, quantitative and qualitative data. The instrument for collecting the quantitative data was objective test of reading comprehension, while the instruments for qualitative data were gathered through observation sheet, diary notes and check list. Based on the data analysis, the mean of the students score in pre-test 51, in cycle I was 61.75, and in cycle II was 80.50. The conclusion is that The Students Concept Attainment Model can improve the students’ achievement in reading comprehension.

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Implementasi Model Pembelajaran Kooperatif Tipe NHT Dengan Menggunakan Periodic Table Explorer (PT-E) Untuk Meningkatkan Hasil Belajar Pada Siswa Kelas Xi Ipa 1 SMA Negeri 4 Palopo

Al-Khwarizmi Jurnal Pendidikan Matematika dan Ilmu Pengetahuan Alam ◽

10.24256/jpmipa.v1i1.85 ◽

2018 ◽

Vol 1 (1) ◽

pp. 69-86

Author(s):

Andi Irawati Indal Patra

Keyword(s):

Action Research ◽

Periodic Table ◽

Classroom Action Research

Telah dilakukan penelitian tentang implementasi model pembelajaran kooperatif tife NHT dengan menggunakan Periodic Table Explorer (PT-e) untuk meningkatkan hasil belajar pada siswa kelas XI IPA 1 SMA Negeri 4 palopo. Penelitian ini bersifat kaji tindak atau rancangan penelitian tindakan kelas ( classroom action research ) yang lakukan secara berdaur (siklus). Subjek penelitian ini adalah siswa Kelas XI SMA Negeri 4 Palopo yang berjumlah 30 orang, terdiri dari 4 orang laki-laki dan 26 orang perempuan. Penelitian ini dilaksanakan sebanyak dua siklus dengan tiga kali pertemuan setiap siklusnya, alokasi waktu 2 x 45 menit tiap pertemuan. Tahapan pelaksanaan penelitian setiap siklus terdiri atas empat tahapan utama yaitu (1) perencanaan, (2) tindakan, (3) pengamatan, (4) refleksi. Data hasil pengamatan mengenai aktivitas siswa dalam proses belajar mengajar pada siklus dua sudah sangat baik dibandingkan siklus pertama. Penelitian tentang hasil belajar siswa pada siklus 1 diperoleh siswa yang mendapat nilai ? 66 adalah 19 orang atau 63% dan masuk dalam kategori tuntas. Siswa yang mendapat nilai ? 65 adalah 11 orang = 37% masuk dalam kategori belum tuntas dengan nilai rata-rata siswa 72,1. Hasil penelitian siklus 2 diperoleh siswa yang mendapat nilai ? 66 adalah 26 orang (tuntas) sedangkan siswa yang mendapat nilai ? 65 adalah 4 siswa (belum tuntas) dengan nilai rata-rata siswa 79,4. Dari data tersebut dapat disimpulkan bahwa melalui implementasi model pembelajaran kooperatif tife NHT dengan menggunakan periodic table explorer (PT-e) pada materi struktur atom dan sistem periodik, hasil belajar siswa kelas XI IPA 1 tahun 2012 / 2013 SMA Negeri 4 Palopo dapat ditingkatkan

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Multislice calculations for quasi-periodic and non-periodic objects

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173820 ◽

1990 ◽

Vol 48 (4) ◽

pp. 138-139

Author(s):

R. Herrera ◽

A. Gómez

Keyword(s):

Electron Diffraction ◽

Computer Simulations ◽

Periodic Table ◽

Amorphous Materials ◽

Space Group ◽

Essential Step ◽

Shape Effects ◽

Atomic Scattering ◽

Diffraction Patterns ◽

Periodic Continuation

Computer simulations of electron diffraction patterns and images are an essential step in the process of structure and/or defect elucidation. So far most programs are designed to deal specifically with crystals, requiring frequently the space group as imput parameter. In such programs the deviations from perfect periodicity are dealt with by means of “periodic continuation”.However, for many applications involving amorphous materials, quasiperiodic materials or simply crystals with defects (including finite shape effects) it is convenient to have an algorithm capable of handling non-periodicity. Our program “HeGo” is an implementation of the well known multislice equations in which no periodicity assumption is made whatsoever. The salient features of our implementation are: 1) We made Gaussian fits to the atomic scattering factors for electrons covering the whole periodic table and the ranges [0-2]Å−1 and [2-6]Å−1.

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