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All Journal Jurnal Pendidikan dan Pengajaran JURNAL FISIKA Journal of Natural Sciences and Mathematics Research Phenomenon : Jurnal Pendidikan MIPA Jurnal Penelitian Pendidikan IPA (JPPIPA) JRST (Jurnal Riset Sains dan Teknologi) Jurnal Pendidikan Fisika dan Teknologi Jurnal Teori dan Aplikasi Fisika Physics Education Research Journal
Agus Yulianto
Universitas Negeri Semarang
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences

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Pembuatan dan Karakterisasi Sifat Fisis Komposit Multilayer Serat Rami Naila Hilmiyana Syifa; Agus Yulianto; Upik Nurbaiti
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 7 No 2 (2021): Juli-Desember
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v7i2.2783

Abstract

The use of composites as an innovative new material is increasing. Composites are made from two or more materials that have different properties. This research was conducted to make multilayer composites and determine the effect of variations in the number of arrangements and the direction of the fiber angles on the physical properties of composites made from ramie fiber and epoxy. The physical properties of the composites analyzed in this study were density, porosity, water absorption, and thickness expansion. The composites in this study were made using the hand layup method with a volume fraction ratio of 30% and the ratio of epoxy and hardener was 2: 1. Before the composite was made, ramie fibers were soaked in 5% NaOH for 2 hours. This study succeeded in making epoxy ramie multilayer composites with variations in the number of arrangements and the direction of the fiber angles. Variations in the number of layers and the direction angle of the ramie fiber in the composite affect the density and porosity of the composite. Variations in the direction of the ramie fiber in the composite affect the water absorption of the composite. Variations in the number and direction of ramie fiber in the composite did not significantly affect the thickness of the composite.
Aplikasi Styrofoam Sebagai Absorpsi Bunyi Allif Silfiyana Rohman; Agus Yulianto; Upik Nurbaiti
Jurnal Teori dan Aplikasi Fisika Vol 10, No 1 (2022): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v10i1.2817

Abstract

This study aims to determine the level of sound attenuation of Styrofoam material. This research is using a noise meter application Decibel X: dB Sound Level Meter and a sound generator as a sound source. Then Styrofoam as an acoustic material with a thickness of 1 cm; 1.5 cm; 2 cm; 2.5 cm ; 3 cm; 3.5 cm and 4 cm. The average absorption coefficient obtained in this study with a material thickness of 1 cm is 0.023. Then the average absorption coefficient at a thickness of 1.5 cm is 0.031. While the average absorption coefficient at a material thickness of 2 cm is 0.040. Furthermore, the average sound absorption coefficient at a thickness of 2.5 cm and 3 cm has the same value, namely 0.039. Then, the average sound absorption coefficient at a thickness of 3.5 cm and 4 cm also has the same value, which is 0.038. Based on the research that has been done, it can be concluded that sound absorption at frequencies below 1000 Hz occurs significant sound absorption. At frequencies of 200 Hz, 400 Hz, 600 Hz and 800 Hz, the average sound absorption increases from 1 cm to 3.5 cm of Styrofoam thickness. While the thickness of Styrofoam 4 cm on average did not show a significant increase in sound absorption. Styrofoam thickness of 4 cm can effectively absorb sound at a frequency of 1000 Hz only.
The Effectiveness of Integrated Comic Electronic Media Islamic Values on Students' Creative Thinking Ability Ucca Swasti Praptiwi; Agus Yulianto; Ellianawati Ellianawati
Jurnal Penelitian Pendidikan IPA Vol. 7 No. SpecialIssue (2021): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v7iSpecialIssue.1033

Abstract

Learning activities that utilize digital technology for online learning are an alternative during the COVID-19 pandemic. This study aims to determine the effectiveness of electronic comic media based on problem-based learning integrated with Islamic values to improve students' creative thinking skills. This study uses a Research and Development approach using the ADDIE model. The subjects in the study were 90 students of class VIII. Data collection techniques using research instruments with quantitative data analysis. The data collection instrument was by giving essay questions in the form of a creative thinking ability test. The study of creative thinking skills by calculating the N-gain and the significance test was carried out using an average difference test through a t-test with the help of SPSS. The results showed that the value of significance (2 tailed) from the two schools, namely 0.00 < 0.05, then H0 is rejected, and Ha is accepted, so it can be concluded that there is a difference in the average creative thinking ability of the pretest and posttest both at SMP N 3 Watumalang and at SMP IT Permata Hati, which means that there is an effect of using E-Comic media in improving students' creative thinking skills
Cultural Integration on Students' Productivity During Distance Learning Parmin Parmin; Mohammad Qois Syafi; Iwan Junaedi; Agus Yulianto; Eling Purwantoyo; Ibnul Mubarok
Jurnal Pendidikan dan Pengajaran Vol 54 No 3 (2021): OCTOBER 2021
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.85 KB) | DOI: 10.23887/jpp.v54i3.38924

Abstract

This study aims to measure the effectiveness of cultural integration on the productivity of Mathematics and Natural Sciences students during the implementation of distance learning. The culture integrated into this research is a habit that becomes a society's tradition in behaving. The research problem is about the integration of culture on character formation, which impacts student productivity. The study used mixed methods with quantitative data from questionnaires and qualitative data from interviews and document analysis. The research targets are 344 students filled out the questionnaire. After the questionnaire data was analyzed, it was deepened through interviews. The relationship test between character strengthening and students' productivity obtained a correlation coefficient value of 0.59, indicating that the correlation between variables is quite strong. Internalization of cultural values into forming students' characters in distance lectures and activities is carried out through habituation. The selection of online application media refers to the ease of access, students' common use, and ease of operation. The research concludes that students' characters contribute to building students' self-awareness to be productive.
The effect of drying temperature on the characteristics of biodegradable plastic from Cassava pulp and Chitosan Adina Widi Astuti; Agus Yulianto; Upik Nurbaiti
Journal of Natural Sciences and Mathematics Research Vol 7, No 1 (2021): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.2021.7.2.8389

Abstract

Conventional plastics made from polyethylene (PE), polypropylene (PP), polyvinylchloride (PVC), polystyrene, and poly (ethylene terephthalate) are difficult to decompose. Bioplastics can reduce the amount of toxic waste generated from biological materials other than petroleum.  The combination of cassava pulp and chitosan can be used as a candidate for the manufacture of biodegradable plastics. The optimal drying temperature can produce biodegradable plastics that have good quality. The method used to determine the effect is the mechanical properties test with ASTM D-638M standard and degradation test. The results of this study obtained 6 samples of biodegradable plastic with variations in temperature A=40˚C, B=50˚C, C=60˚C, D=70˚C, E=80˚C and F=90˚C. From the results of the mechanical properties test, the tensile strength values of each sample are A = 0,84 MPa, B = 1,78 MPa, C = 2,24 MPa, D = 1,58 MPa, E = 1,23 MPa and F =0,57 MPa. While the percent elongation value of each sample is A = 11,09%, B = 21,62%, C = 30,25%, D = 15,94%, E = 13% and F = 7,2%. The drying temperature in the process of making biodegradable plastics can affect its mechanical properties, namely the higher the drying temperature used, the lower the tensile strength value and the percent elongation, this is because high temperatures can damage the chemical structure and evaporated sorbitol which serves to increase flexibility. The higher the drying temperature also causes the biodegradable plastic to take longer to degrade. Sample A with the lowest temperature degraded the fastest for 28 days, while sample F with the highest temperature degraded the fastest for 46 days.©2021 JNSMR UIN Walisongo. All rights reserved.
Development of I-SETS Thematic Teaching Materials to Improve Student Character Siti Munazilah; Agus Yulianto
Phenomenon : Jurnal Pendidikan MIPA Vol 11, No 2 (2021): Jurnal Pendidikan MIPA
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/phen.2021.11.2.8428

Abstract

The teaching material focuses on the theme of rain which is discussed through the I-SETS approach (Islamic, scientific, environmental, technological, and social). This study aimed to determine the characteristics, feasibility, and enchancement of student character after using teaching materials. This study uses the Research and Development (R D) method in the form of One Group Pretest-Post-test Design. Data collection techniques through interviews, observation, questionnaires, and test results. Data analysis techniques is quantitative descriptive. The characteristics of the teaching materials that had been developed were viewed from three aspects (content, presentation, and language). This characteristic is supported by validating the feasibility of teaching materials of 86.58% had very feasible criteria. Readability results reached a percentage of 53.20% in the appropriate category for students. The results of the application of teaching materials showed that there is no influence yet of teaching materials on the character development and integrated thinking skills which are based on the N-gain test acquisition of 0.169 from the results of the character questionnaire, 0.218 from the results of the character observastions, 0.085 from pretest-posttest mark. This is due to obstacles when learning online and limited number of encounters. 
SINTESIS PIGMEN ALAMI DAUN TANAMAN ANDONG (CORDYLINE FRUTICOSA L.) SEBAGAI PEWARNA BATIK DAN ANALISIS SIFAT OPTIKNYA Nita Rosita; - Susanto; Andya Satya Purnomo Putro; Riameinda Br. Bangun; Agus Yulianto; Mahardika Prasetya Aji
Jurnal Fisika Vol 4, No 2 (2014)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v4i2.3832

Abstract

Pigmen alami dari daun tanaman Andong (Cordyline fruticosa L.) telah berhasil disintesis secara sederhana dengan merendamnya pada larutan 20 ml HCl 1,47 M. Massa daun dijadikan sebagai variabel bebas penelitian dimana 1 gram hingga 6 gram daun direndam pada larutan kemudian dianalisis sifat optik berupa transmitansi dan absorbansinya. Pigmen yang dihasilkan dalam penelitian ini berwarna merah. Hasil analisis menunjukkan bahwa transmitansi pigmen yang diperoleh menurun secara eksponensial dengan penambahan massa daun. Hasil tersebut menunjukkan pada massa daun 4 gram pigmen telah mengalami saturasi. Adapun absorbansi pigmen yang dihasilkan pada penelitian ini memiliki spektrum absorbansi pada daerah UV hingga spektrum tampak yaitu pada panjang gelombang 200 – 700  nm. Dari hasil analisis absorbansi tersebut, pigmen yang dihasilkan dari penelitian ini secara umum merupakan pigmen jenis flavonoid.  Berdasarkan hasil penelitian ini, disimpulkan bahwa daun tanaman Andong berpotensi sebagai pewarna alami yang selanjutnya dapat diaplikasikan untuk pewarna batik.
ANALISIS SPEKTRUM ABSORBANSI PIGMEN FLAVONOID DARI DAUN TANAMAN ANDONG (CORDYLINE FRUTICOSA L.) SEBAGAI DYE SOLAR SEL - Susanto; Budi Antoni Saputra; Khoirun Nisa’; Nita Rosita; Agus Yulianto
Jurnal Fisika Vol 4, No 2 (2014)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v4i2.3833

Abstract

Pigmen flavonoid dari daun tanaman Andong (Cordyline fruticosa L.) telah dihasilkan secara sederhana dengan merendamnya pada larutan 20 ml HCl 1,5 M. Massa daun dijadikan sebagai variabel bebas penelitian dimana 1 gram hingga 6 gram daun direndam pada larutan kemudian dianalisis absorbansinya. Absorbansi pigmen di dalam penelitian ini diukur menggunakan spektrometer UV-VIS. Pigmen yang dihasilkan dalam penelitian ini berwarna merah. Pigmen yang dihasilkan pada penelitian ini mengabsorb cahaya dengan optimum pada daerah tampak 400-700 nm. Absorbansi maksimum yang dihasilkan oleh tamanan Andong berada pada spektrum tampak adalah 500 nm, sehingga pigmen yang dihasilkan merupakan jenis pigmen flavonoid. Absorbansi pigmen yang tinggi pada spectrum tampak saat dipicu oleh sumber energi dari luar, memberikan harapan pigmen tanaman Andong sebagai bahan absorben yang baik. Berdasarkan kurva absorbansi yang diperoleh, spektrum absorbansi semakin melebar dengan pengaruh massa sehingga baik digunakan sebagai bahan absorben seperti dye pada solar sel berbasis sensitasi (Dye Sensitized Solar Cell).
KOEFISIEN SERAP BUNYI AMPAS TEBU SEBAGAI BAHAN PEREDAM SUARA Yani Puspitarini; Fandi Musthofa A. S.; Agus Yulianto
Jurnal Fisika Vol 4, No 2 (2014)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v4i2.3834

Abstract

Penyerap bunyi telah berhasil dibuat dengan bahan dasar ampas tebu dan diketahui koefisien serap bunyinya menggunakan metode tabung impedansi. Material penyerap bunyi ini dibuat dengan cara mencampurkan ampas tebu dengan perekat PVA cair, dicetak, dan dikeringkan dibawah sinar matahari selama 5 hari. Sampel silinder dibuat sebanyak enam buah dengan tebal:0,26cm; 0,48cm; 0,76cm; 1,04cm; 1,3cm dan 1,76cm. Pengujian dilakukan berdasarkan perbedaan ketebalan sampel pada frekuensi 400 Hz, 500 Hz, dan 600 Hz. Nilai koefisien serap bunyi optimal sebesar 0,89 pada frekuensi 600 Hz dengan tebal sampel 0,26 cm dan kerapatannya 0,33 gram/cm3. Sedangkan nilai koefisien serap minimum sebesar 0,19 dicapai pada sampel dengan ketebalan 0,26cm. Koefisien serap bunyi semakin menurun dengan bertambahnya ketebalan sampel. Peredam suara dengan bahan dasar ampas tebu memiliki kualitas yang cukup baik sebagai peredam dengan kandungan karbon yang tinggi dan materialnya yang berserat tinggi bahan ini juga ramah lingkungan.
PENGARUH FREKUENSI RESONANSI TERHADAP PENURUNAN SUHU PADA SISTEM TERMOKLASTIK SEDERHANA Moh. Shofi Nur Utami; Nur Rohman Arif; Agus Yulianto
Jurnal Fisika Vol 4, No 2 (2014)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v4i2.3835

Abstract

Termoakustik merupakan fenomena fisis dimana perubahan temperatur dapat menyebabkan gelombang (akustik) bunyi atau sebaliknya gelombang (akustik) bunyi dapat menimbulkan perubahan temperatur. Sistem termoakustik sederhana yang menggunakan stack dari bahan plastik dengan panjang 10 cm dan pori-pori berbentuk lingkaran serta resonator tube dari bahan PVC dengan diameter 11⁄4 in. dioperasikan untuk mengetahui pengaruh frekuensi resonansi terhadap penurunan suhunya. Metode yang digunakan untuk frekuensi resonansi, yaitu dengan menentukan panjang resonator tube, kemudian memberikan perlakuan pada resonator tube dengan memberikan gelombang bunyi pada resonator tube, ketika tampilan spektrum pada CRO menampilkan puncak spektrum maksimum dapat dikatakan sudah terjadi resonansi. Transfer energi optimum terjadi pada saat resonansi. Frekuensi resonansi mempengaruhi panjang resonator tube, semakin tinggi frekuensi resonansi maka panjang resonator tube semakin pendek. Hal ini yang menyebabkan kecepatan transfer kalor pada frekuensi resonansi tinggi semakin cepat. Perubahan suhu terkecil terjadi pada frekuensi resonansi 90 Hz, yaitu 0,9 oC. Sedangkan perubahan suhu terbesar terjadi pada frekuensi resonansi 150 Hz, yaitu 1,9 oC dibagian tandon dingin sistem termoakustik sederhana.
Co-Authors - Susanto Adina Widi Astuti Allif Silfiyana Rohman Andya Satya Purnomo Putro Budi Antoni Saputra Eling Purwantoyo Ellianawati, Ellianawati Fandi Musthofa A. S. Ibnul Mubarok Ika Vidiasari Aristawati Iwan Junaedi Khoirun Nisa’ Mahardika Prasetya Aji Moh. Shofi Nur Utami Mohammad Qois Syafi Naila Hilmiyana Syifa Nita Rosita Nur Rohman Arif Parmin Parmin Riameinda Br. Bangun Siti Munazilah Ucca Swasti Praptiwi Upik Nurbaiti Yani Puspitarini Yulita Nurbaiti