1,720,958 research outputs found
Pengaruh Penerapan Model Pembelajaran STM (Sains, Teknologi, Masyarakat) Menggunakan Media Peta Konsep Terhadap Minat Belajar
No full textThe goal of this study was to find out the effect of the implementation of science, technology, and society (STS) learning model by using concept maps toward students’ learning interest in Islamic Senior High School. Therefore, the study was carried out in queasy experiment design and the sample was taken through purposive sampling technique, which consists of two classes, namely XC as experiment class and XB as control one. After implementing those learning model and technique, the data was collected through questionnaire and documentation. Due to the statistic analysis, it was examined that the implementation of concept maps technique on experiment class has affected students’ interest in learning 81.45%, and it was categorized into good, in contrast, in control group it has affected students’ interest about 61.2% that was categorized into Fair. Similarity, the hypothesis testing by using Mann-Whitney test on the final questionnaire average score has revealed that the Zo (t-obtained) score was -5.74 and Z table score was -1.96 based on 5% significant standard, further, when Zo ≤-Z table, the null hypothesis was rejected and the alternative hypothesis was accepted. In conclusion, there was the significant effect of science, technology, and society (STS) learning model by using concept maps technique toward students’ learning interest in Hydrocarbon class in Islamic Senior High School of Islamic Boarding School Daarun Nahdhah Thawalib Bangkinang for the 2015/2016 academic year.Keywords : Science, Technology, Society (STS) teaching model, concept maps techniques, students’ learning Interest, and hydrocarbon.</jats:p
POTENSI MIKROORGANISME TANAH SEBAGAI MIKROORGANISME PENGURAI LIMBAH PLASTIK PADA TANAH GAMBUT SEBAGAI SUMBER BELAJAR MATERI POLIMER SMA
No full textAbstrakMeningkatnya penggunaan plastik diikuti dengan besarnya kepedulian terhadap isu lingkungan mengenai pembuangan produk plastik sintetis yang sulit terurai. Salah satu alternatif untuk mengatasinya adalah dengan memodifikasi plastik agar bersifat biodegradabel. Plastik biodegradabel (plastik ramah lingkungan) dirancang mampu terdekomposisi di alam. Tingkat di biodegradasi yang terjadi tergantung pada kondisi tanah seperti suhu, kadar air, tingkat aerasi, keasaman dan konsentrasi mikroorganisme sendiri. Berdasarkan hal diatas, maka dilakukan penelitian dengan tujuan mengetahui efektifitas penguraian plastik ramah lingkungan dengan metode pengomposan dalam tanah gambut (TG) dan tanah sampah, serta faktor pH. Dari hasil penelitian kami mendapatkan bahwa pada semua perlakuan uji pada hari ke-20 sampai hari ke-60 terjadi peningkatan persentase penurunan berat plastik ecoplas dan oxium. Sedangkan persentase perubahan berat plastik terbesar dari proses biodegradasi terhadap semua perlakuan uji adalah pada TG3pada hari ke-60 yaitu 0,45%. Secara umum, jika pH tanah dibuat semakin asam, maka menyebabkan penguraian plastik semakin bertambah.Kata Kunci : Plastik, Mikroorganisme tanah, lahan gambut.</jats:p
DESAIN BAHAN AJAR BERUPA HANDOUT BERBASIS INKUIRI TERBIMBING PADA PEMBELAJARAN KIMIA MATERI HIDROKARBON
No full textAbstractThis research was instigated by students’ difficulty at the tenth grade of State Senior High School 10 Pekanbaru in comprehending chemistry concept of Hydrocarbon Lesson that made them unable to achieve optimal learning achievement, thus a teaching lesson was required to guide them to comprehend the concept. It was done by designing a teaching lesson in the form of handout Guided Inquiry based. This research aimed at knowing the validity and practicality levels of handout Guided Inquiry based that was valid and practical. It was a Research and Development (R&D) with 4D (four-D) model, modified by doing limited trials and removing disseminating step. It was administered at State Senior High School 10 Pekanbaru. The primary data were collected in this research through questionnaire. Validity and practicality test questionnaires were the instruments of collecting the data. The data obtained were analyzed by using Descriptive qualitative and quantitative analysis techniques. The handout produced was tested, its validity level was 89.94% (very valid) and its practicality level was 76.50% (practical). Based on these results, it could be identified that the handout tested was appropriate and practical to be an alternative teaching lesson for teachers in a school. Keywords: Handout, Guided Inquiry, Hydrocarbon</jats:p
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
OPTIMASI BIODEGRADABILITAS DAN UJI TOKSISITAS HASIL DEGRADASI SURFAKTAN LINEAR ALKILBENZENA SULFONAT (LAS) SEBAGAI BAHAN DETERJEN PEMBERSIH
No full textOptimization of Biodegradability and Toxicity Testing of Degradation Product from Linear Alkyl Benzene Sulfonate (LAS) Surfactant as Cleaning Detergent Agent. Linear Alkyl Benzene Sulfonate (LAS) is a surfactant used in laundry detergent as cleaning agent and toxic to aquatic organisms. Results shows, with the LAS concentration used (20 ppm) in medium, adaptation time and Acinetobacter sp. growth has shown better biodegradation ability than three other bacteria used Pseudomonas putida, Pseudomonas fluorescence, Bacillaria spp. Thus, Acinetobacter sp is used further for biodegradation process of LAS. Based on its biodegradation half-life using Acinetobacter sp, and with mixed culture (± 52.32% and ± 46.82% respectively) could be achieved in 4 (four) days, LAS could be categorized as a biodegradable compound. The toxicity assay is based on tetrazolium dye reduction with Rhizobium meliloti as indicator organism. LAS is more toxic than its intermediate product from biodegradation, with IC50 = 34.35 ppm, and the intermediate product, Ac and Cm, has IC50 = 446.19 ppm and 111.28 ppm respectively. Identification of intermediate products using IR and LC-MS analysis shows that the degradation product contains chemicals compounds with functional group as follows: benzene, benzoic acid, hydroxyl, and aliphatic carbons with large molecule weight. Until its half-time degradation time, LAS biodegradation process only occurs at the aliphatic carbon chain, and have not yet reached the stage of aromatic ring opening. Keywords: biodegradation, linear alkylbenzene sulfonate (LAS), Rhizobium meliloti, tetrazolium dy
Optimization of Biodegradability and Toxicity Testing of Degradation Product from Linear Alkyl BenzeneSulfonate (LAS) Surfactant as Cleaning Detergent Agent
No full textOptimization of Biodegradability and Toxicity Testing of Degradation Product from Linear Alkyl BenzeneSulfonate (LAS) Surfactant as Cleaning Detergent Agent. Linear Alkyl Benzene Sulfonate (LAS) is a surfactantused in laundry detergent as cleaning agent and toxic to aquatic organisms. Results shows, with the LAS concentrationused (20 ppm) in medium, adaptation time and Acinetobacter sp. growth has shown better biodegradation ability thanthree other bacteria used Pseudomonas putida, Pseudomonas fluorescence, Bacillaria spp. Thus, Acinetobacter sp isused further for biodegradation process of LAS. Based on its biodegradation half-life using Acinetobacter sp, and withmixed culture (± 52.32% and ± 46.82% respectively) could be achieved in 4 (four) days, LAS could be categorized as abiodegradable compound. The toxicity assay is based on tetrazolium dye reduction with Rhizobium meliloti as indicatororganism. LAS is more toxic than its intermediate product from biodegradation, with IC50 = 34.35 ppm, and theintermediate product, Ac and Cm, has IC50 = 446.19 ppm and 111.28 ppm respectively. Identification of intermediateproducts using IR and LC-MS analysis shows that the degradation product contains chemicals compounds withfunctional group as follows: benzene, benzoic acid, hydroxyl, and aliphatic carbons with large molecule weight. Untilits half-time degradation time, LAS biodegradation process only occurs at the aliphatic carbon chain, and have not yetreached the stage of aromatic ring opening
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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