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Characterization of Temperature Response of Asymmetric Tapered-Plastic Optical Fiber-Mach Zehnder Interferometer Ian Yulianti; Ngurah Made Darma Putra; Fianti Fianti; Abu Sahmah Mohd Supaat; Helvi Rumiana; Siti Maimanah; Kukuh Eka Kurniansyah
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 10 No. 1 (2020)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v10n1.p34-43

Temperature measurement is important in various applications; therefore, various temperature sensors have been developed. Due to its advantages, many optical fiber-based temperature sensors have been proposed. The wavelength modulation-based optical sensor is interesting due to high accuracy. However, the complex fabrication process and high cost limit the advantages of the sensors. Therefore, we proposed a simple and low-cost Mach Zehnder interferometer (MZI) sensor using step-index plastic optical fiber (SI-POF). Performance characterization of the sensor to temperature variation is presented. The sensor consists of two tapers at several distances, forming an interferometer. The first taper was designed to be steep to allow excitation of cladding modes, while the second taper was gradual to suppress power loss. Characterizations were done in terms of sensitivity, hysteresis, and repeatability by analyzing the output spectrums recorded by the spectrometer at various environment temperatures, 35oC to 85oC, with an increment of 10oC. The results showed that the sensor has a sensitivity of 0.0431 nm/oC and a correlation coefficient of 0.9965. Hysteresis of 6.9Ã—10-3 was observed. In terms of repeatability, the sensor shows a maximum deviation, ±3oC, which was mainly resulted from the fluctuation of the oven temperature. Despite its high deviation, the sensor has advantages of simple fabrication, low cost, robust, and low power loss, which make it a good candidate for temperature sensors.

ANALISIS KEMAMPUAN LITERASI SAINS FISIKA SISWA SMA PADA MATERI KINEMATIKA GERAK LURUS DI MASA PANDEMI COVID-19 Farikhatul Mukharomah; Wiyanto Wiyanto; Ngurah Made Darma Putra
Journal of Teaching and Learning Physics Vol 6, No 1 (2021): Journal of Teaching and Learning Physics (Februari 2021)
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jotalp.v6i1.10391

Pembelajaran daring di masa pandemi Covid-19 yang tidak maksimal memberikan dampak terhadap kemampuan literasi sains, termasuk literasi sains fisika. Terlebih fakta di Indoensia, kemampuan literasi sains siswa masih rendahmenurut hasil PISA. Oleh karena itu, diperlukan upaya untuk meningkatkan kemampuan literasi sains siswa. Tujuan penelitian ini adalah untuk menganalisis kemampuan awal literasi sains fisika siswa kelas X MIPA SMA Negeri 1 Jepara di masa pandemi Covid-19. Penelitian ini termasuk penelitian deskriptif kuantitatif. Sampel penelitian ini adalah 71 siswa kelas X MIPA SMA Negeri 1 Jepara. Data dikumpulkan dengan wawancara dan tes secara online. Domain kemampuan literasi sains yang diukur adalah domain kompetensi. Hasil penelitian menunjukkan bahwa kemampuan literasi sains fisika siswa pada materi kinematika gerak lurus pada domain kompetensi sebesar 57,50% masih dalam kategori pencapaian “rendah”. Oleh sebab itu, kemampuan literasi sains fisika siswa perlu ditingkatkan. Salah satu faktor rendahnya kemampuan literasi sains fisika ini adalah proses pembelajaran daring yang belum menerapkan kegiatan praktikum. Maka dari itu, upaya untuk meningkatkan kemampuan literasi sains fisika tersebut dapat dilakukan dengan cara melakukan kegiatan praktikum berbasis literasi sains secara daring

Media Scrapbook Sebagai Jurnal Refleksi untuk Meningkatkan Kemampuan Kognitif dan Regulasi Diri Amnah Nur Alfiah; Ngurah Made Darma Putra; Bambang Subali
Jurnal Pendidikan (Teori dan Praktik) Vol 3 No 1 (2018): Volume 3, Nomor 1, April 2018
Publisher : Fakultas Ilmu Pendidikan Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jp.v3n1.p57-67

Penelitian ini bertujuan untuk: (1) menghasilkan desain pembelajaran dengan menggunakan media scrapbook sebagai jurnal refleksi, (2) mengetahui perbedaan peningkatan kemampuan kognitif dan regulasi diri siswa antara kelas eksperimen dan kelas kontrol, (3) mengetahui peningkatan kemampuan kognitif dan regulasi diri siswa setelah diberikan perlakuan, (4) mengetahui korelasi antara regulasi diri terhadap kemampuan kognitif serta (5) profil keduanya. Desain penelitian menggunakan metode kombinasi mix method model concurrent embedded dengan subjek penelitian adalah 72 siswa dari kedua kelas sampel. Data diambil dari tes kemampuan kognitif dan angket regulasi diri, sedangkan teknik analisis data dengan uji-t, uji N gain, uji korelasi pearson dan uji effect-size. Hasil penelitian menunjukkan terdapat perbedaan kemampuan kognitif dan regulasi diri, scrapbook sebagai jurnal refleksi dapat meningkatkan kemampuan kognitif dan regulasi diri, serta terdapat korelasi antara regulasi diri terhadap kemampuan kognitif siswa. Pada uji effect size didapatkan hasil bahwa kemampuan kognitif siswa didominasi oleh aspek pemahaman (C1). Sedangkan pada regulasi diri adalah aspek pemantauan.AbstractThis research aims to: (1) produce learning design using scrapbook media as reflection journal, (2) to know the differences of cognitive ability improvement and self-regulation of students between experiment and control class, (3) to know the improvement of cognitive ability and self-regulation of students after being given treatment, (4) to know correlation between self-regulation toward the cognitive ability and (5) profile of both. The design of the research using mix method concurrent embedded model with the subject of research is 72 students from both sample class. Data were taken from cognitive ability test and self-regulation questionnaire, while data analysis technique was t-test, N gain test, Pearson correlation test and effect-size test. The results show that there are differences in cognitive and self-regulating abilities, scrapbooks as reflective journals can improve cognitive abilities and self-regulation, and there are correlations between self-regulation toward cognitive abilities. In effect size test results obtained that the cognitive abilities of students dominated by aspects of understanding (C1). While the self regulation is the aspect of monitoring.

Media Scrapbook Sebagai Jurnal Refleksi untuk Meningkatkan Kemampuan Kognitif dan Regulasi Diri Amnah Nur Alfiah; Ngurah Made Darma Putra; Bambang Subali
Jurnal Pendidikan (Teori dan Praktik) Vol 3 No 1 (2018): Volume 3, Nomor 1, April 2018
Publisher : Fakultas Ilmu Pendidikan Universitas Negeri Surabaya

Penelitian ini bertujuan untuk: (1) menghasilkan desain pembelajaran dengan menggunakan media scrapbook sebagai jurnal refleksi, (2) mengetahui perbedaan peningkatan kemampuan kognitif dan regulasi diri siswa antara kelas eksperimen dan kelas kontrol, (3) mengetahui peningkatan kemampuan kognitif dan regulasi diri siswa setelah diberikan perlakuan, (4) mengetahui korelasi antara regulasi diri terhadap kemampuan kognitif serta (5) profil keduanya. Desain penelitian menggunakan metode kombinasi mix method model concurrent embedded dengan subjek penelitian adalah 72 siswa dari kedua kelas sampel. Data diambil dari tes kemampuan kognitif dan angket regulasi diri, sedangkan teknik analisis data dengan uji-t, uji N gain, uji korelasi pearson dan uji effect-size. Hasil penelitian menunjukkan terdapat perbedaan kemampuan kognitif dan regulasi diri, scrapbook sebagai jurnal refleksi dapat meningkatkan kemampuan kognitif dan regulasi diri, serta terdapat korelasi antara regulasi diri terhadap kemampuan kognitif siswa. Pada uji effect size didapatkan hasil bahwa kemampuan kognitif siswa didominasi oleh aspek pemahaman (C1). Sedangkan pada regulasi diri adalah aspek pemantauan.AbstractThis research aims to: (1) produce learning design using scrapbook media as reflection journal, (2) to know the differences of cognitive ability improvement and self-regulation of students between experiment and control class, (3) to know the improvement of cognitive ability and self-regulation of students after being given treatment, (4) to know correlation between self-regulation toward the cognitive ability and (5) profile of both. The design of the research using mix method concurrent embedded model with the subject of research is 72 students from both sample class. Data were taken from cognitive ability test and self-regulation questionnaire, while data analysis technique was t-test, N gain test, Pearson correlation test and effect-size test. The results show that there are differences in cognitive and self-regulating abilities, scrapbooks as reflective journals can improve cognitive abilities and self-regulation, and there are correlations between self-regulation toward cognitive abilities. In effect size test results obtained that the cognitive abilities of students dominated by aspects of understanding (C1). While the self regulation is the aspect of monitoring.

Profile of Pre-Service Physics Teachers’ Scientific Literacy Based on Competence Aspects Firdaus Firdaus; Wiyanto Wiyanto; Ngurah Made Darma Putra; Wiwi Isnaeni; Sri Jumini; Eli Trisnowati
International Conference on Science, Education, and Technology Vol. 7 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

The rapid development of scientific information impacts students' ability to solve problems in daily life based on each student's ability to manage the information. This study aims to analyze and describe the scientific literacy of pre-service teachers in the physics education study program in the second semester. This research method is a descriptive method with a quantitative approach. The data collection technique is a test using a test sheet instrument containing 11 questions about scientific literacy, which consists of 3 aspects: explaining phenomena scientifically, evaluating and designing scientific investigations, and interpreting data and evidence scientifically. Experts have validated the instruments used. The results showed that the overall scientific literacy competence of students was in a low category. One indicator shows the value in the medium category, while the other indicators show the low category. These results indicate that students' scientific literacy skills need to be improved. These findings can be used as a basis for evaluating the learning process by emphasizing the development of students' scientific literacy skills.

Meta-Analysis of Student Reality Construction in Online Practicum Yusmaniar Afifah Noor; Ngurah Made Darma Putra; Sunyoto Eko Nugroho
International Conference on Science, Education, and Technology Vol. 7 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

The absence of ideal characteristics from the use of practicum can be solved based on empirical data which makes the practicum more effective. Reality construction is a way of taking pictures based on what students get from practical experience. The purpose of this study is to identify indicators of reality construction formed by students in online practicums. The method used is a meta-analysis by reviewing 24 international journals. The data analysis used is quantitative data analysis with effect size and percentage, while qualitative data analysis is for data resulting from narrative studies of the studies encountered. Based on analysis study of reality construction indicators can be generated five indicators that often appear, which is conceptual understanding, relevance and contribution of laboratory activities, student satisfaction, interaction and laboratory work patterns, resources and instructional. Students' conceptual understanding can be increased by applying online practicum. More than 60% of respondents stated that the contribution of online practicum is the same or better than conventional practicum. Overall, students feel quite satisfied in accessing online practicum, especially satisfaction in terms of time. However, students have more difficulty collaborating in online practicums. Along with the development of digital technology can facilitate interaction by communicating virtually. In addition, adequate quality of resources and instructional resources are needed so that they can effectively frame student learning.

Changes in Students' Cognitive Structure on the Concept of Diffraction and Light Interference Using PhET Virtual Simulation Syifa, Almira; Darma Putra, Ngurah Made; Darsono, Teguh; Rohim, Ahmad Minanur
Physics Education Research Journal Vol 5, No 1 (2023)
Publisher : Faculty of Science and Education, UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/perj.2023.5.1.13658

The concept of diffraction and interference of light is one of the abstract concepts of physics. The process of light diffraction and interference occurs in the abstract. Learning about diffraction and light interference requires media that represent the events. Cognitive structures can represent the quality of students' understanding. Learning Physics is easier to understand through direct experience in the form of practicum. Abstract Physics concepts will be easier to learn with the appropriate visualization. One of the virtual practicums' media uses PhET virtual simulations to improve students' cognitive structure is measured using concept map questions and supported by description questions. The purpose of this research is to increase the cognitive structure of students by using PhET. This research is quantitative research and the experimental design used the experiment method. There are three groups in the experiment, that is a virtual simulation, a real practicum as an experiment class, and a control class. The results of the one-way ANOVA test on the concept map questions showed a significance value (p) 0.05, meaning that there were differences in cognitive structure between groups. The significance value (p) between the virtual simulation group and the real practicum group was 0.014, while the significance value between the virtual simulation group and the control class was 0.00, meaning that there was a significant difference in learning effectiveness between groups. Based on the data of the research concluded that physics learning assisted by virtual simulations can develop students' cognitive structures on the concepts of diffraction and light interference.

Thermal Durability Characterization of a Simple Polymethyl-methacrylate (PMMA) Based-Optical Waveguide Yulianti, Ian; Insan , Shiva Maulana Khoiru; Putra, Ngurah Made Darma; Purwinarko, Aji; Widiarti, Nuni; Ngajikin, Nor Hafizah
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 14 No. 2 (2024)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v14n2.p113-124

Polymethyl-methacrylate (PMMA)-based optical waveguide is a good candidate for a simple and low-cost waveguide. However, the thermal properties have not been investigated. In this work, thermal durability characterization of PMMA-based waveguide was carried out. Waveguide fabrication process was done in three stages, which are patterning the PMMA cladding, core material synthetization and core material application to the cladding. Core pattern with cross section area of 1×1 mm2 was engraved on the 4 cm long PMMA sheet. Unsaturated polyester resin (UPR) was used as a core material. Characterizations were conducted for temperature dependent loss (TDL), temperature working range, and long exposure durability. For TDL characterization, the temperature varied from 30°C to 75°C. Meanwhile, for temperature working range, the waveguide was exposed to cycled heating. The thermal durability characterization was done by immersing the waveguide in distilled water at temperature of 40 °C for 288 hours. The results showed that a little change of output intensity occurred due to temperature variation with TDL of 0.0235 dB/°C. The maximum limit of the temperature is 70°C. For long exposure to temperature of 40oC, the results showed that the waveguide has a good performance.

Analisis Model Mental Mahasiswa tentang Struktur Atom: Perspektif untuk Penentuan Strategi Pembelajaran Nurhayati, Khofifah; Nugroho, Sunyoto Eko; Putra, Ngurah Made Darma
Unnes Physics Education Journal Vol. 14 No. 1 (2025)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/upej.v14i1.22346

Pemahaman mahasiswa tentang struktur atom dipengaruhi oleh model mental yang mereka bentuk berdasarkan pengalaman belajar. Model mental ini beragam dan tidak selalu sesuai dengan konsep ilmiah yang diharapkan. Penelitian ini mendeskripsikan model mental mahasiswa tentang struktur atom serta implikasinya terhadap strategi pembelajaran. Metode yang digunakan adalah deskriptif kualitatif dengan tes diagnostik two-tier dan wawancara klinis. Hasil menunjukkan bahwa model mental mahasiswa terbagi menjadi tiga kategori: mekanika kuantum (sesuai konsep ilmiah modern), intermediet (kombinasi teori klasik dan kuantum), dan klasik (berbasis model Bohr dan Rutherford). Faktor yang memengaruhi model mental ini meliputi pengalaman belajar, penggunaan analogi, dan pemahaman konsep abstrak. Strategi pembelajaran berbasis eksplorasi dan interaktif direkomendasikan untuk membantu mahasiswa membangun model mental yang lebih ilmiah.

Changes in Students' Cognitive Structure on the Concept of Diffraction and Light Interference Using PhET Virtual Simulation Syifa, Almira; Darma Putra, Ngurah Made; Darsono, Teguh; Rohim, Ahmad Minanur
Physics Education Research Journal Vol. 5 No. 1 (2023)
Publisher : Faculty of Science and Education, UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/perj.2023.5.1.13658

The concept of diffraction and interference of light is one of the abstract concepts of physics. The process of light diffraction and interference occurs in the abstract. Learning about diffraction and light interference requires media that represent the events. Cognitive structures can represent the quality of students' understanding. Learning Physics is easier to understand through direct experience in the form of practicum. Abstract Physics concepts will be easier to learn with the appropriate visualization. One of the virtual practicums' media uses PhET virtual simulations to improve students' cognitive structure is measured using concept map questions and supported by description questions. The purpose of this research is to increase the cognitive structure of students by using PhET. This research is quantitative research and the experimental design used the experiment method. There are three groups in the experiment, that is a virtual simulation, a real practicum as an experiment class, and a control class. The results of the one-way ANOVA test on the concept map questions showed a significance value (p) <0.05, meaning that there were differences in cognitive structure between groups. The significance value (p) between the virtual simulation group and the real practicum group was 0.014, while the significance value between the virtual simulation group and the control class was 0.00, meaning that there was a significant difference in learning effectiveness between groups. Based on the data of the research concluded that physics learning assisted by virtual simulations can develop students' cognitive structures on the concepts of diffraction and light interference.

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