1,720,989 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Penerapan Pembelajaran DRILL untuk Meningkatkan Aktivitas Belajar Mahasiswa Jurusan Kimia FMIPA UNM pada Perkuliahan Kimia Fisik 2 Tahun Akademik 2008/2009
No full textABSTRAK Penelitian ini adalah penelitian tindakan kelas yang bertujuan untuk menemukan langkah-langkah pembelajaran DRILL yang dapat meningkatkan aktivitas belajar mahasiswa semester IV program studi pendidikan kimia tahun akademik 2008/2009. Subjek penelitian adalah mahasiswa semester IV kelas B program studi pendidikan kimia Jurusan Kimia FMIPA UNM sebanyak 40 mahasiswa. Data yang terkumpul dianalisis berdasarkan indiktor keberhasilkan sebagai kriteria keberhasilan penerapan pembelajaran yakni siswa dalam mengikuti proses pembelajaran paling sedikit 60% terlibat aktif seperti mengerjakan latihan terstruktur yang diberikan dalam bentuk work sheet, bertanya, meminta bimbingan pada dosen, mengerjakan soal pada white board, mengeluarkan pendapat (memberikan penjelasan tentang konsep penyelesaian latihan/soal) dan sebagainya. Kriteria keberhasilan dilihat dari tingkat pemahaman mahasiswa adalah pada setiap tes siklus (setiap selesai 1 materi pokok) adalah 60% siswa memperoleh nilai lebih dari 64. Hasil penelitian menunjukkan bahwa aktivitas belajar yang ditunjukkan oleh mahasiswa mengalami peningkatan dari siklus 1 (61,4%) ke siklus 2 (71,8%). sedangkan untuk tingkat pemahaman mahasiswa pada siklus 1 yakni yang memperoleh nilai lebih dari 64 adalah sebesar 60,5% dan pada siklus 2 sebesar 70,7%. Kata Kunci: Pembelajaran Drill, Aktivitas belajar. ABSTRACT This classroom action research is aimed to find Learning Drill Steps that’s can increasing learning activity of the IV semester student of chemistry education academic year 2008/2009. The subject of the research are 40 students of the class B of the IV semester of chemistry Department FMIPA UNM. The datas has been collected analyzed based on kinerja indicator as keberhasilan criterium of learning applied. That is less 60% active like; do structural training that is given by work sheet, ask question, ask guides from lecturer, solving problem on the white board, give opinion, etc. keberhasilan criterium can be seen by students’s comprehension level in every cycle that 60% get score 64. the research result shows that student’s activity increasing from 61,4 % in cycle 1 to 71,8% in cycle 2. while comprehension level increasing from 60,5% to 70,7.% Key Word : Learning Drill, Learning activit
Kapasitas Adsorpsi Tanah Diatomeae (Diatomaceous earth) terhadap Ion Kromium (VI)
Full text linkABSTRAKPenelitian bertujuan untuk menentukan kapasitas adsorpsi tanah diatomeae terhadap ion kromium (VI). objek penelitian adalah tanah diatomeae yang diambil dari laboratorium teknik kimia UGM Yogyakarta. Tanah diatomeae kemudian diaktivasi secara fisika pada suhu 350oC selama 3 jam di dalam tanur. Tanah Diatomeae dianalisis daya serapnya dengan mencari waktu kontak optimum dengan variasi waktu kontak 1, 2, 4, 6 dan 12 jam. Setelah itu, menentukan daya serap tanah diatomeae pada berbagai konsentrasi, yakni 10, 20, 30, 40 dan 50 ppm dan kapasitas adsorpsinya. Penentuan ion kromium (VI) yang teradsorpsi oleh tanah diatomeae dilakukan dengan metode titrasi iodometri dengan menghitung selisih konsentrasi ion kromium (VI) sebelum dan sesudah adsorpsi. Penentuan kapasistas adsorbsi menggunakan pola isoterm adsorbsi yang sesuai. Hasil penelitian menunjukkan bahwa waktu kontak yang optimum adalah 2 jam, kapasistas adsorpsinya sebesar 6,452 g/L dan mengikuti pola isoterm adsorpsi Freundlich dengan nilai R2 = 0,8550. Kata kunci: ion kromium (VI), tanah diatomeae, kapasitas adsorpsi ABSTRACT This study aimed to determine the adsorption capacity of diatomae towards chromium VI ion. The object was taken from chemical engineering laboratory UGM Yogyakarta. Diatomeaes was physicall activated 350oC for 3 hours in furnace. Absorption potence determined by finding the optimum contact time with a variation of the contact time 1, 2, 4, 6 and 12 hours. Also to determine the absorption of diatomeaes at various concentrations; 10, 20, 30, 40 and 50 ppm and then determine the adsorption capacity. Cumulatif chromium (VI) ion adsorbed by diatomeaes performed by iodometric titration method, calculating the difference ion concentration of chromium (VI) before and after adsorption. Determination of adsorption Capacity using appropriate isotherms adsorption pattern and is obtained the optimum contact time was 2 hours, Capacity adsorption 6.452 g/L and follow the Freundlich adsorption isotherm type with R2 value is 0.8550. Key words: chromium (VI), diatomeae soil, adsorption capacit
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Pengaruh Penerapan Pembelajaran Snowball Throwing terhadap Hasil Belajar Siswa Kelas X SMAN I Bajeng Kab. Gowa (Studi pada Materi Pokok Senyawa Hidrokarbon)
Full text linkPenelitian ini bertujuan untuk mengetahui pengaruh pembelajaran Snowball Throwing terhadap hasil belajar siswa pada materi pokok senyawa hidrokarbon. Populasi penelitian seluruh siswa kelas X tahun pelajaran 2010/2011 SMAN 1 Bajeng Kabupaten Gowa, sampel Kelas X1 sebagai kelas kontrol dan kelas X2 sebagai kelas eksperimen. Pengumpulan data melalui tes hasil belajar, angket pendapat siswa dan guru serta lembar observasi aktivitas siswa dengan desain penelitian pretest-posttes control group design. Data dianalisis dengan analisis deskriptif dan inferensial menunjukkan ada pengaruh positif pembelajaran snowball throwing terhadap hasil belajar siswa dengan signifikansi 0,000. Pembelajaran ini dapat meningkatkan aktivitas belajar siswa, 81,88% siswa menjawab pertanyaan sesuai indikator, 79,34% siswa yang berdiskusi dalam kelompok dan membuat pertanyaan. Guru dan siswa memberi tanggapan positif terhadap model pembelajaran yang digunakan. Kata Kunci : Snowball Throwing, hasil belajarABSTRACT This study aims to determine the effect of learning Snowball Throwing against the learning result of students in the subject matter of hydrocarbons. The population is X class, academic year 2010/2011 SMAN 1 Bajeng Gowa, the sample as a control class Class X1 and X2 class as a class experiment. The data collect through the test, student opinion with questionnaire and observation and the student activity with the design of the study control group pretest-posttes design. Data were analyzed with descriptive and inferential analyzes showed no positive effect of learning snowball throwing on student learning outcomes with a significance of 0.000. This learning can improve student learning activities, 81.88% of students answered the question according to the indicators, 79.34% students discuss in groups and make inquiries. Teachers and students responded positively to the learning model. Keywords: Snowball Throwing, learning resul
Pengembangan Perangkat Pembelajaran IPA Kimia SMP Berbasis Kontekstual pada Materi Pokok Bahan Kimia di Rumah
Full text linkPenelitian ini adalah penelitian pengembangan yang bertujuan mengembangkan perangkat pembelajaran IPA Kimia SMP berbasis kontekstual pada materi pokok bahan kimia di rumah yang layak, praktis dan efisien untuk digunakan. Model pengembangan mengacu pada model Plomp. Hasil validasi menunjukkan bahwa kepraktisan berdasarkan angket persepsi dari empat orang guru IPA SMP memberikan respon positif terhadap perangkat pembelajaran yang dikembangkan dan setuju bahwa perangkat tersebut lebih membuat kelas menjadi termotivasi untuk belajar. Persepsi dari 28 siswa terhadap perangkat dan model pembelajaran pernyataan positif 81,88% rata-rata (kategori praktis). Hal ini menunjukkan bahwa perangkat pembelajaran maupun model pembelajaran berbasis kontekstual praktis dan layak untuk digunakan. Uji coba terbatas pada SMPN 1 Sungguminasa Kab. Gowa siswa kelas VIIIb dengan pretest dan postest diperoleh jumlah siswa yang tuntas 79,3% dan 20,7% tidak tuntas. Hasil pengujian dengan SPSS for Windows 15,0 dengan uji t ditemukan bahwa nilai signifikansi sebesar 0,000 artinya perangkat pembelajaran yang dikembangkan efektif untuk digunakan. Kata Kunci: Perangkat Pembelajaran, CTL, Bahan Kimia di rumah. ABSTRACT The aimed of this research is developing a Science chemistry learning tools for SMP based on contextual of chemicals topic at home indeed proper, practical, and efficient. Model refers to the Plomp Development model. Validation results contain that the practicality based a perception questionnaire from the four science teachers of SMP responded positively to the learning tools were developed and agreed that such devices are motivated to learn. The perception of 28 students to the tools and learning models positive statement 81.88% on average (practical class). This shows that the learning tools and the learning model based on practical contextual are feasible to use. The limited trial to SMP 1 Sungguminasa District. Gowa grade students with pretest and posttest VIIIb obtained the number of students who completed 79.3% and 20.7% did not complete. Test with SPSS for Windows 15.0 by t test found that the significant value of 0.000 means the learning tools was developed are affective to use. Keywords: Learning Tools, CTL, Chemicals at hom
Analisis Kesulitan Mahasiswa dalam Perkuliahan dan Praktikum Kimia Dasar di Jurusan Kimia FMIPA Universitas Negeri Makassar
Full text linkPenelitian ini ingin diketahui hambatan yang menjadi penyebab kesulitan belajar pada proses pembelajaran dan pada pelaksanaan praktikum kimia dasar serta korelasi antara pelaksanaan praktikum dan teori matakuliah kimia dasar. Dengan metode deskriptif analisis dengan menggunakan test dan angket diperoleh hasil penelitian bahwa hambatan yang menyebabkan kesulitan belajar kimia dasar mahasiswa jurusan kimia adalah ada pada kemampuan penguasaan materi dan pelaksanaan praktikum dari keempat indikator sebesar 53,29%, pada proses pembelajaran dari lima indikator sebesar 8,69%, pada pelaksanaan praktikum sebesar 66,26%. Pada faktor lingkungan masyarakat, secara statistik didapat secara kseseluruhan dari delapn faktor yang diselidiki memiliki pengaruh cukup besar yaitu 66,15%. Katakunci: kesulitan belajar, kimia dasarABSTRACT This study to know the barriers that cause learning difficulties in the learning process and the implementation of the basicchemistry practical and the correlation between theory and practical implementation of the basic chemistry course. With the descriptive method of analysis using the test and questionnaire results obtained that the barriers that lead to learning disabilities basic chemistry is the chemistry student on mastery of skills and practical implementation of the four indicators of 53.29%, in the learning process of the five indicators of 8, 69%, on the practical implementation of 66.26%. Out site factors, have considerable influence that is 66.15%. Keywords: learning difficulties, basic chemistr
PERANGKAT PEMBELAJARAN BERBASIS KETERAMPILAN GENERIK SAINS PADA TOPIK KINETIKA KIMIA
Full text linkThis research is a development research that aims to produce generic skill-based learning tools on the chemical kinetic topic. Chemical kinetic Topic is a part of the Physical Chemistry II course.. This topic include: kinetic reaction, reaction mechanism, temperature influence on chemistry reaction rates, and photochemistry. Learning tools that developed are: Learning Plan Unit (LPU), Student Worksheet, and Achievement Test. The development model used is the 4-D model of the development of Thiagarajan with four stages, namely: the definition (define), design (design), development (develop), and the spread (disseminate). The validity of the test is based on two validator evaluation. Test the practicality of the tools in this study are lecturers and students of the chemistry education programs of Science and Mathematics Faculty UNM who follow the course of chemical kinetics. Test the effectiveness based on n-gain of student achievement results. The results showed that the learning tools developed have valid criteria
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