Found 9 Documents

Critical Condition in CuInAlSe2 Growth of Solar Cell Absorber Sujarwata, Sujarwata; Fianti, Fianti; Jung, J.Y.; Lee, S.H.; Kim, K.H.; Amal, M.I.
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 3: September 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (168.717 KB) | DOI: 10.12928/telkomnika.v14i3.3644


CuInAlSe2 (CIAS) thin films were prepared using pulsed laser deposition (PLD) and selenization. The PLD process utilized a certain kind of stacking order to deposit elemental films on glass substrates, layer by layer, for precursor preparation. They were designed to be Al- and Cu-deficient and selenized using two different heat treatment steps. According to its precursor compositional ratio, stacking order, and heat treatment, each CIAS film showed different properties and a critical condition. The crystalline phases, compositional ratio, morphology, and optical-electrical properties of the CIAS films are discussed here.   
Current State: The Development of Thin Film Solar Cells Based on Kesteritee Compound Fianti, Fianti; Munir, Badrul; Kim, Kyoo Ho; Amal, Mohammad Ikhlasul
Journal Of Natural Sciences And Mathematics Research Vol 2, No 1 (2016): Volume 2, Nomor 1, 2016
Publisher : Faculty of Science and Technology, State Islamic University Walisongo Central Java

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.2016.1.1.1641


Thin film solar cell experience fast development, especially for thin film solar cell CdTe and Cu(In,Ga)Se2 (CIGS). However, the usage of rare element in the nature such as In, Te, and Ga and toxic such as Cd give limitation in the future development and production growth in big scale. Development of other alternative compound with maintain the profit of electronic and optic character which get from CIGS chalcopyrite compound will be explain. Compound of Cu2ZnSnSe4 (CZTSe) is downward compound from CIGS with substitute the In and Ga element with Zn and Sn. The compound kesterite structure can be modified with variation of chalcogen element to get wanted character in solar cell application. Efficiency record of photovoltaic devices conversion used this compound or downward reach 9.7%.©2016 JNSMR UIN Walisongo. All rights reserved.
Unnes Science Education Journal Vol 7 No 1 (2018): February 2018
Publisher : Unnes Science Education Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v7i1.23836


The ability to think creatively in improving the quality of education is considered as a very vital source for a nation. If carefully observed, education development efforts have not been optimal, it is because the teacher does not know the extent to which student’s creative thinking ability. Therefore, in certain subjects (IPA) that require high creative thinking skills, there are still many students who lack value. The aims of the study are to determine the ability of creative thinking and the influence of learning models of Community Technology Science (CTS) in improving the creativity of junior high school students on global warming materials. The research design used is descriptive quantitative. The population in this study are students of class VII SMP N 1 Jakenan. The sample is determined by purposive sampling. Test methods, observations, and questionnaires were used to collect research data. The results showed that students creative thinking ability using CTS model for high category was 12%, medium 65%, and low 23% based on test, while for creative attitude, 100% of students were in medium category. CTS models influence on the ability of creative thinking of students increased by 6%.
Jurnal Bahan Alam Terbarukan Vol 7, No 2 (2018): December 2018 [Nationally Accredited]
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v7i2.15019


The growth of the manufacturing industry in Indonesia affects on the demand of automotive parts. This study aims see the mechanical properties of organic brake canvas made from durian fruit skin and teak leaves. Composite making was done by smoothing durian fruit and teak leaves to become powder. The resulting powder was filtered with mesh 60 so that the particle size is the same so as to facilitate mixing. After that, simple mixing with other ingredients such as magnesium oxide and polyester resin is carried out. The printing process was carried out with a hydraulic press with a load of 4 tons for 3 hours. The brake canvas produced were tested for hardness, wear resistance, and absorbency by varying the percentage composition of the powder of durian fruit fiber and teak leaves. There are five variations in the percentage of composite material composition tested. The results obtained the percentage of the most optimum composition that has a value of hardness, wear wear resistance, and absorption capacity close to the value of the Indonesian National Standard (SNI 09-0143).
UPEJ Unnes Physics Education Journal Vol 5 No 3 (2016)
Publisher : UPEJ Unnes Physics Education Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/upej.v5i3.13766


      Selama ini siswa masih menganggap fisika sebagai pelajaran yang sulit dan membosankan. Pandangan ini dapat diubah dengan menerapkan model pembelajaran yang dapat membuat siswa merasa nyaman dalam belajar, salah satunya adalah quantum learning. Universitas Negeri Semarang (UNNES) telah mendeklarasikan diri sebagai universitas konservasi sejak 12 Maret 2010, sehingga calon pendidik yang diluluskan oleh UNNES juga bertanggung jawab dalam membawa misi konservasi ke dalam proses pembelajaran. Pembelajaran yang disisipi nilai konservasi diharapkan dapat membentuk karakter siswa ke arah yang lebih baik. Pendidikan karakter di era global saat ini menjadi sangat penting karena kualitas karakter bangsa menentukan kemajuan bangsa tersebut. Penelitian ini bertujuan untuk mengetahui perkembangan karakter dan peningkatan hasil belajar siswa setelah diterapkan model quantum learning bermuatan konservasi. Desain penelitian yang digunakan adalah One Group Pretest Posttest. Hasil penelitian menunjukkan bahwa model quantum learning bermuatan konservasi dapat mengembangkan karakter khususnya rasa ingin tahu, jujur, disiplin, dan komunikatif. Selain itu, hasil belajar siswa pada materi teori kinetik gas mengalami peningkatan dengan gain pada kategori sedang.
Penggunaan Metode CRI (Certainty Of Response Index) Berbantuan Soal PISA (Programme Of International Student Assesment) untuk Mengidentifikasi Miskonsepsi IPA Materi Tata Surya Rachmawati, Sekar; Susanto, Hadi; Fianti, Fianti
UPEJ Unnes Physics Education Journal Vol 6 No 3 (2017)
Publisher : UPEJ Unnes Physics Education Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/upej.v6i3.19310


PISA's results show that math and science education in Indonesian students is very low. One of the causes of the poor quality of education in Indonesia is the lack of understanding of concepts and misconceptions. This study aims to determine the various misconceptions of junior high school students in the solar system. The design of this study is survey research with sampling using simple random sampling obtained class VII B and VII C. Methods of data collection with PISA-assisted tests, questionnaires and interviews. The result of the research shows the misconception level on the concept of sea tidal rise of 34%, the concept of rotation of the Earth by 26%, the concept of the Earth revolution by 36%, the concept of the Sun as a star of 36%, the concept of the Sun which has 23% The moon is 43%, the concept of rotation and the revolution of the Moon is 36%, the concept of urban and rural observation of the stars by 33%, the concept of meteoroid, meteor and meteorite by 47%, the concept of Kepler's third law by 31% Planet type and its orbital velocity by 36%, the concept of the second law of Keppler by 41%, the concept of the gravitational force between the Sun and the planet by 39%, the concept of Newton's law of gravity of 27%
Dampak Penguatan Apersepsi dan Pemberia Tugas Terhadap Penguasaan Konsep Siswa Pakungwati, Intan Fauziyyah; Ellianawati, Ellianawati; Fianti, Fianti
UPEJ Unnes Physics Education Journal Vol 7 No 3 (2018)
Publisher : UPEJ Unnes Physics Education Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/upej.v7i3.27671


Salah satu usaha untuk memajukan pendidikan adalah dengan melakukan pengembangan kurikulum. Pelaksanaan Kurikulum 2013 yang dilaksanakan di Indonesia menggunakan pendekatan saintifik. Pada pelaksanaan kurikulum tersebut terdapat kendala, salah satunya yaitu rendahnya kemampuan siswa dalam memahami materi yang menyebabkan hasil belajar siswa menjadi rendah. Sehubungan dengan hal tersebut, penguatan apersepsi perlu dilakukan untuk dapat menyadarkan siswa bahwa materi yang akan dipelajari memiliki relevansi dengan materi yang telah dipelajari. Selain itu, pemberian tugas perlu pula dilakukan untuk melatih sifat kemandirian siswa, rasa tanggung jawab, serta kedisiplinan mereka untuk meningkatkan prestasi belajar. Penelitian ini bertujuan untuk mengukur pengaruh hasil belajar siswa melalui pendekatan pembelajaran saintifik dengan penguatan apersepsi dan pemberian tugas pada mata pelajaran IPA. Desain penelitian yang digunakan adalah Quasi Experimental Design dengan Non-equivalent Control Group Design. Teknik pengambilan sampel pada penelitian ini adalah Purposive Sampling dan diperoleh kelas eksperimen yang menerapkan pembelajaran saintifik dengan penguatan apersepsi dan pemberian tugas. Kelas kontrol yang dipilih menerapkan pembelajaran saintifik tanpa penguatan apersepsi dan pemberian tugas. Hasil analisis uji t untuk hasil belajar kognitif siswa diperoleh rata-rata nilai thitung = 3,53 dan ttabel = 1,668 untuk taraf signifikansi 5%. Hasil uji N-gain untuk hasil belajar kognitif siswa diperoleh rata-rata nilai N-gain = 0,7 yang termasuk dalam peningkatan kategori tinggi. Berdasarkan hasil penelitian, menunjukkan bahwa pembelajaran dengan penguatan apersepsi dan pemberian tugas dapat meningkatkan penguasaan konsep siswa.   One of the ways to improve education is to develope the curriculum. In Indonesia, the implementation of the 2013 Curriculum uses a scientific approach. In implementing that curriculum, there are many problems one of them is students do not understand the material that causes student learning outcomes become low. Therefore, it is important to strengthen the apperception in order to awaken students aware that the material has relevance to the material that has been learned. In addition, it also necessary to provide student’s assignments to train their independences, responsibilities and disciplines to improve thier learning achievement. The aim of the research is to measure the effect of student learning outcomes through scientific learning approach by strengthening apperception and assignment in science subjects. This research uses Quasi Experimental Design with Nonequivalent Control Group Design. The sampling technique in this research used Purposive Sampling and obtained by the experimental class which applied scientific approach by strengthening the apperception and assignment. The control applied scientific learning without strengthening apperception and assignments. The results of the t-test analysis for students' cognitive learning outcomes was in average value of tcount = 3.53 and ttable = 1.668 for a significance level of 5%. The results of the N-gain test for students' cognitive learning outcomes was in average value of N-gain = 0.7 that showed the high category in mastering of learning improvement. Based on the results of the research  above, it shows that learning by strengthening the apperception and assignment can improve students' concepts understanding.
The Effect of Project Based Learning Model Aided Scratch Media Toward Learning Outcomes and Creativity Husna, Asmaul; Cahyono, Edy; Fianti, Fianti
Journal of Innovative Science Education Vol 8 No 1 (2019): Article In Press
Publisher : Postgraduate, Universitas Negeri Semarang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jise.v7i2.25584


The learning process can be interpreted as a form of system designed to improve students' abilities. In fact, the learning process is still monotonous so that students are not motivated to follow the study, students who are not motivated in participating in learning will not stimulation student creativity and good learning outcomes. The purpose of this study was to measure the differences in learning outcomes and creativity of students who use the PjBL model assisted by the scratch media and students who use the PjBL model with simple media, and analyze students' responses to science learning using the PjBL model assisted by scratch media. This research used descriptive quantitative methods. The research design was posttest-only control group design. It was known that learning outcomes and creativity of the experimental class are better than the control class. The learning outcomes of the experimental class have an average value of 75.66 and the control class have an average value of 68.99. From the observation of creativity, the average creativity of the experimental class is 78.41 and the control class is 73.43. According analysis of students' responses during learning, that students of the experimental class responded well by showing very positive criteria. These results indicate that PjBL assisted by scratch media can develop students' creativity and give to good learning outcomes.
Jurnal Sains Dasar Vol 5, No 1 (2016): Jurnal Sains Dasar
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (675.438 KB) | DOI: 10.21831/jsd.v5i1.12660


Abstract Waste management system at Semarang State University (UNNES) landfill implements a system of open dumping located in Banaran, Gunungpati, Semarang City. Data from Conservation Team UNNES on December 28, 2010 about the volume of waste per day from UNNES showed that the majority of waste is organic waste. This study aims to determine of 3D distribution leachate. Resistivity geoelectrical method Schlumberger configuration is used to indicate leachate. Data collection was performed three tracks, which three tracks parallel East-West direction, with a path length of 75 m each. The profile of leachate water in the surrounding area of UNNES landfill can be observed ± 20 m depth from the surface. Data processing was performed using software Res2Dinv, Surfer 10.0, and RockWorks 15. Based on the results, resistivity of leachate is 1,87-9,9 ?m with the direction of flow to a lower elevation areas. Keywords: geoelectrical, leachate, resistivity, Schlumberger's configuration