1,720,966 research outputs found
ANALISIS PENGETAHUAN CALON GURU KIMIA TENTANG PERALATAN LABORATORIUM DAN FUNGSINYA
Get PDFPembelajaran IPA berkaitan erat dengan cara mencari tahu (inkui- ri) tentang alam semesta secara sistematis, sehingga IPA bukan hanya penguasaan pengetahuan berupa fakta, konsep atau prinsip saja, tetapi merupakan suatu proses penemuan. Hal tersebut diperoleh melalui keg- iatan praktikum. Namun, pelaksanaannya di lapangan memiliki beberapa kelemahan antara lain rendahnya pengetahuan guru tentang peralatan kimia dan fungsinya. Hasil penelitian ini menunjukkan calon guru kimia tidak dapat men- gidentifikasi peralatan laboratorium dan mengetahui fungsinya secara tepat. Kesalahan mahasiswa dapat diidentifikasi menjadi 5 kategori. Per- tama, sebagian mahasiswa mengetahui nama dan fungsinya namun tidak mengetahui gambar alat (tidak mengetahui wujudnya). Kedua, mengeta- hui nama tetapi tidak mengetahui fungsi dan gambar alat. Ketiga, tidak dapat menyebutkan nama dengan benar tetapi mengetahui fungsi dan gambar alat. Keempat, mengetahui nama dan gambar tetapi tidak menge- tahui fungsinya. Dan yang kelima, tidak mengetahui nama, fungsi maupun gambar alat. Pengetahuan mahasiswa yang kurang dapat dipengaruhi oleh jumlah peralatan dan bahan masih belum mancukupi, keterbatasan waktu praktikum dan perlunya proses pendampingan dari dosen pengam- pu praktikum
PENGEMBANGAN MEDIA PEMBELAJARAN “PETUAH KIMIA†(KOMIK DIGITAL MATERI IKATAN KIMIA)
No full textThe Indonesian children\u27s literacy is still relatively low, and it has become a severe problem that the government, teachers, parents, and librarians should face. The data shows that only 10% of Indonesian children like to read a book, while most chemistry material is written in textbooks. This study aims to produce digital comics with chemical bonding material, determine comics\u27 feasibility, and respond to readers. The research method develops the Borg and Gall model with seven stages of development without compromising the essence of the model. Meanwhile, data collection techniques are interviews, validation, and questionnaires using a Likert scale. The media and material validator has validated the product developed in this study. As a result, the media aspect has an overall score of 48 or 100%; the score belongs to the very decent criteria. The material aspect has got a score of 26 or 93% from the basic chemistry lecturers; Also, the chemistry teachers give 100%. In addition, the digital comic readers have an extensive test. Conversely, 48 respondents have been assessed with an overall score of 2753 or 90%. Hence, this percentage value relates to the very feasible category. Thus, the characteristics of this digital comic have fulfilled the material, media, language, and visual aspects; since it is included in the worthy category as an independent learning medium without replacing the role of educators.Minat membaca anak Indonesia tergolong terendah didunia, diperkirakan hanya 10% anak Indonesia yang gemar membaca sedangkan sebagian besar ilmu kimia tertuang dalam bentuk tulisan atau buku teks (textbook). Tujuan penelitian ini untuk menghasilkan komik digital dengan materi ikatan kimia, mengetahui kelayakan komik, dan respon pembaca. Metode penelitian mengembangkan model Borg and Gall dengan tujuh tahap pengembangan tanpa mengurangi esensi dari model tersebut. Teknik pengumpulan data yang digunakan yakni wawancara, validasi, dan kuisioner menggunakan skala Likert. Produk yang dikembangkan dalam penelitian ini divalidasi oleh validator ahli media dan ahli materi. Pada aspek media, komik digital ini memiliki skor keseluruhan 48 dengan persentase 100%, skor ini termasuk kedalam kriteria ‘sangat layak’. Aspek materi memperoleh skor 26 dengan persentase 93% dari dosen kimia dasar dan 28 dengan persentase 100% dari guru kimia. Hal ini menunjukkan bahwa komik ini termasuk kedalam kriteria ‘sangat layak’. Pada tahapan terakhir dilakukan pengujian secara luas kepada pembaca komik digital, sebanyak 48 responden memberikan penilaian dengan skor keseluruhan sebesar 2753 dan persentase sebesar 90%. Nilai persentase ini termasuk kedalam kategori ‘sangat layak’. Karakteristik komik digital ini telah memenuhi aspek materi, media, bahasa, dan grafis sehingga termasuk dalam kategori sangat layak sebagai media pembelajaran mandiri tanpa menggantikan peran pendidik
PENGEMBANGAN MEDIA PEMBELAJARAN “PETUAH KIMIA†(KOMIK DIGITAL MATERI IKATAN KIMIA)
No full textThe Indonesian children's literacy is still relatively low, and it has become a severe problem that the government, teachers, parents, and librarians should face. The data shows that only 10% of Indonesian children like to read a book, while most chemistry material is written in textbooks. This study aims to produce digital comics with chemical bonding material, determine comics' feasibility, and respond to readers. The research method develops the Borg and Gall model with seven stages of development without compromising the essence of the model. Meanwhile, data collection techniques are interviews, validation, and questionnaires using a Likert scale. The media and material validator has validated the product developed in this study. As a result, the media aspect has an overall score of 48 or 100%; the score belongs to the very decent criteria. The material aspect has got a score of 26 or 93% from the basic chemistry lecturers; Also, the chemistry teachers give 100%. In addition, the digital comic readers have an extensive test. Conversely, 48 respondents have been assessed with an overall score of 2753 or 90%. Hence, this percentage value relates to the very feasible category. Thus, the characteristics of this digital comic have fulfilled the material, media, language, and visual aspects; since it is included in the worthy category as an independent learning medium without replacing the role of educators.Minat membaca anak Indonesia tergolong terendah didunia, diperkirakan hanya 10% anak Indonesia yang gemar membaca sedangkan sebagian besar ilmu kimia tertuang dalam bentuk tulisan atau buku teks (textbook). Tujuan penelitian ini untuk menghasilkan komik digital dengan materi ikatan kimia, mengetahui kelayakan komik, dan respon pembaca. Metode penelitian mengembangkan model Borg and Gall dengan tujuh tahap pengembangan tanpa mengurangi esensi dari model tersebut. Teknik pengumpulan data yang digunakan yakni wawancara, validasi, dan kuisioner menggunakan skala Likert. Produk yang dikembangkan dalam penelitian ini divalidasi oleh validator ahli media dan ahli materi. Pada aspek media, komik digital ini memiliki skor keseluruhan 48 dengan persentase 100%, skor ini termasuk kedalam kriteria ‘sangat layak’. Aspek materi memperoleh skor 26 dengan persentase 93% dari dosen kimia dasar dan 28 dengan persentase 100% dari guru kimia. Hal ini menunjukkan bahwa komik ini termasuk kedalam kriteria ‘sangat layak’. Pada tahapan terakhir dilakukan pengujian secara luas kepada pembaca komik digital, sebanyak 48 responden memberikan penilaian dengan skor keseluruhan sebesar 2753 dan persentase sebesar 90%. Nilai persentase ini termasuk kedalam kategori ‘sangat layak’. Karakteristik komik digital ini telah memenuhi aspek materi, media, bahasa, dan grafis sehingga termasuk dalam kategori sangat layak sebagai media pembelajaran mandiri tanpa menggantikan peran pendidik
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
Synthesis of Hydrochar Cassava peels with hydrothermal carbonization method and applications as hard water softener
Get PDFGroundwater before being used is very important to pay attention to the quality of the water. Water has good quality if it is in accordance with several parameters, including chemical, physical, and biological parameters. Mineral salt content is one of the chemical parameters that can be used to determine the quality of water. In this study, the synthesis of cassava peel hydrochar was successfully carried out using the hydrothermal carbonization (HTC) method. This material was developed to reduce waste of cassava peel biomass and overcome the problem of water hardness. HTC cassava peel was developed as an alternative hard water softener adsorbent. The results of FTIR characterization on hydro-activation (activating hydrochar) and hydro-non (non-activating hydrochar) contain functional groups of O-H stretch, C-H stretch, C≡C stretch and C=C stretch. Observation of surface morphology by SEM method on hydro-non in the form of large sheets, while the surface on hydro-activities in the form of small sheets. The adsorption capacity of hydro-active against Ca2+ ions and Mg2+ ions were 85.240 mg/g and 87.210 mg/g, respectively. Meanwhile, the hydro-non adsorption capacity of Ca2+ and Mg2+ ions were 84,736 mg/g and 85,713 mg/g. The kinetics of hydro-active adsorption on Mg2+ ion took place on order 3 (0.000003 min-1) while when adsorption of Ca2+ ion took place on order 0 (0.0324 min-1).©2021 JNSMR UIN Walisongo. All rights reserved
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
Synthesis and characterization of SO42-/KCC-1 catalyst as an alternative candidate for simultaneous esterification and transesterification reactions
Get PDFSulfate-impregnated acid catalysts can be used to replace conventional homogeneous base catalysts which are very dangerous, corrosive and environmentally unfriendly. Sulfate impregnation on porous support material will increase the surface area of the catalyst. The use of KCC-1 as a supporting material can produce catalysts with excellent properties. The method used in this research is the hydrothermal method for the synthesis of KCC-1 and the direct impregnation method for the synthesis of SO42-/KCC-1. Characterization of the resulting material using X-ray diffraction (XRD), FTIR spectrometer, and low temperature emission scanning electron microscope (SEM). The characterization results showed that the synthesis of KCC-1 and SO42-/KCC-1 had been successfully carried out. This is evidenced by the formation of amorphous silica, the presence of peaks of silica and sulfate groups, and scanning electron microscope images showing nano-sized materials.©2021 JNSMR UIN Walisongo. All rights reserved.
Synthesis of Hydrochar Cassava peels with hydrothermal carbonization method and applications as hard water softener
Get PDFGroundwater before being used is very important to pay attention to the quality of the water. Water has good quality if it is in accordance with several parameters, including chemical, physical, and biological parameters. Mineral salt content is one of the chemical parameters that can be used to determine the quality of water. In this study, the synthesis of cassava peel hydrochar was successfully carried out using the hydrothermal carbonization (HTC) method. This material was developed to reduce waste of cassava peel biomass and overcome the problem of water hardness. HTC cassava peel was developed as an alternative hard water softener adsorbent. The results of FTIR characterization on hydro-activation (activating hydrochar) and hydro-non (non-activating hydrochar) contain functional groups of O-H stretch, C-H stretch, C≡C stretch and C=C stretch. Observation of surface morphology by SEM method on hydro-non in the form of large sheets, while the surface on hydro-activities in the form of small sheets. The adsorption capacity of hydro-active against Ca2+ ions and Mg2+ ions were 85.240 mg/g and 87.210 mg/g, respectively. Meanwhile, the hydro-non adsorption capacity of Ca2+ and Mg2+ ions were 84,736 mg/g and 85,713 mg/g. The kinetics of hydro-active adsorption on Mg2+ ion took place on order 3 (0.000003 min-1) while when adsorption of Ca2+ ion took place on order 0 (0.0324 min-1).©2021 JNSMR UIN Walisongo. All rights reserved
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