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Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics
Published by Universitas Mandiri Bina Prestasi
ISSN : -     EISSN : 29862760     DOI : https://doi.org/10.11594/timeinphys
Core Subject : Science, Education,
Education Mathematics Physics
Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics is a peer-reviewed journal that is published by Universitas Mandiri and managed by the Department of Physics, Faculty of Science, Universitas Mandiri. TIME in Physics is published periodically second times a year in January and August. TIME in Physics provides immediate open access to its content to all readers. The journal is designed to serve academicians, researchers, developers, professionals, and others interested in physics. The articles in TIME in Physics included research and developments in Theoretical Physics, Instrumentation Physics, Material-Molecular Physics, and Physics Education.
Arjuna Subject : Fisika dan Astronomi - Instrumentasi
Articles 12 Documents
 1   2 
Optical Properties of Sodium-doped Carbon Dots Made of Urea and Trisodium Citrate Isnaeni Isnaeni; Vivi Purwandari; Permono Adi Putro; Hammam Magma Adiwidya
TIME in Physics Vol. 1 No. 1 (2023): February
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i1p1-9

Abstract

Carbon dots are very interesting carbon-based nanoparticles. Carbon dots have unique optical properties, especially luminescence properties upon light excitation. Improving optical quality is the challenge in carbon dots research. Doping is one of the methods to improve the quality of carbon dots. In this work, we used sodium, which is an active ion, as doping in the carbon dots. We studied the optical properties of sodium-doped carbon dots. We found that absorbance, FTIR, and photoluminescence spectra changed due additional surface energy level of carbon dots. Furthermore, the quantum yield of carbon dots improved significantly due to sodium doping. In addition, the phosphorescence of sodium-doped carbon dots was slightly longer. Electron behavior was also changed. In conclusion, sodium-doped carbon dots showed very good optical properties for further applications.
Penerapan Model Flipped classroom dalam Pembelajaran Daring pada Mata Kuliah Metode Pembelajaran, Studi Kurikulum, dan Telaah Kurikulum di Universitas Pelita Harapan Kurniawati Martha; Eben Hezer Zega
TIME in Physics Vol. 1 No. 1 (2023): February
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i1p11-22

Abstract

Online learning during a pandemic is a challenge for lecturers in trying to manage interesting learning and can equip students to become skilled people, and able to face the challenges in the future. The practice encountered in class shows online learning that is less active, interactive, and fun, and students who are less enthusiastic, initiative, and responsive. The solution provided by researchers is the application of the flipped classroom model in managing online learning. The aim of the research is to explain the importance of the role of lecturers in managing online learning and to explain lecturers' efforts to make online learning effective using the flipped classroom model. The research methodology used is descriptive qualitative by utilizing the results of observations, assessment results and questionnaires filled out by students supported by literature studies. The implementation of the flipped classroom model was carried out in Curriculum Studies, Learning Methods, and Curriculum Review courses in January - April 2021. The results of the study showed that the flipped classroom model was able to help lecturers manage online learning. In a more effective application, lecturers are advised to get to know students more holistically and continue to develop themselves, so that they can support good learning management.
Implementasi Model Pembelajaran STEM Tipe Index Card Match Terhadap Keterampilan Berpikir Kritis Pada Materi Alat-Alat Optik Fakhira Nursabrina; Wahyu Dian Laksanawati
TIME in Physics Vol. 1 No. 1 (2023): February
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i1p23-30

Abstract

This study aims to implement the Index Card Match type STEM learning model for critical thinking skills in the material of optical devices. This research was conducted in the even semester of the 2021-2022 school year. The method used in this study is a Pre-Experimental Design with the type of research One-Group Pretest-Posttest Design. The population in this study were students in class XI MIPA 5 at SMAN 6 Tangerang Regency. The sampling technique used is Cluster Random Sampling. The data collected is based on the results of the Pretest, Posttest, and student learning activities which are arranged based on indicators of critical thinking, namely: (1) formulating problems; (2) giving arguments; (3) making deductions; (4) perform induction; (5) do evaluation. Then the data were analyzed using the t-test. The results of the hypothesis test obtained tcount = 3.7735 and ttable = 2.0645. Because tcount > ttable, there is an influence on the Index Card Match Type STEM learning model. And also, the activity of students increased during the three meetings. It can be said that after going through the calculation process at the 1st meeting, the percentages for each aspect were 45%, 34%, 39%, and 39%. At the 2nd meeting, the percentages were 60%, 57%, 51%, and 56%. At the 3rd meeting, the percentages were 71%, 72%, 75%, and 78%. Therefore, it can be said that the activity of students increased. So. It can be concluded that there is an increase in critical thinking skills by implementing STEM learning of the Index Card Match type in Optical Equipment material.
Mikrokontroler untuk Mengukur Kecepatan Kereta Api sebagai Sumber Belajar Mahasiswa Fisika Imas Ratna Ermawati; Martin Martin; Tri Isti Hartini; Sugianto Arjo; Supriyatna Supriyatna; Reza Annisa Salsabilla
TIME in Physics Vol. 1 No. 1 (2023): February
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i1p31-36

Abstract

The simulation of uniform straight motion using a miniature train based on the Arduino Uno has been carried out to determine velocity through a complex number approach. The experiment was conducted repeatedly at the same distance to obtain a constant velocity. The equation used to determine the velocity of the train is the application of complex number a + ib with the function  in variation of power. The results show that the velocity of the trains obtained has the same value, thus proving that the uniform straight motion is valid with the same acceleration which is zero (a=0) in this experiment.
Structure and Morphology of ZnO Nanoparticles Prepared by Sonochemical Method Akhiruddin Maddu; Zetria Zikri; Irzaman Irzaman
TIME in Physics Vol. 1 No. 2 (2023): August
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i2p51-58

Abstract

Ultrasonic wave has been utilized to synthesize the ZnO nanoparticle. ZnO is formed from a mixture of zinc acetate (ZnAc) and Natrium Hydroxide (NaOH) with various concentrations of ZnAc 0.5 M (ZnO 1:1) and 1.5 M (ZnO 3:1) and the concentration of NaOH remained at a concentration of 0.5 M. The Structure and crystal size were characterized using X-ray Diffraction (XRD), while its morphology was examined by Scanning Electron Microscopy (SEM). The results show that ZnO 1:1 has a higher (stronger) diffraction intensity than the ZnO 3:1. The crystallite size of ZnO 1:1 averaged 30.57 ± 4.31 nm while the ZnO 3:1 had an average crystallite size of 20.25 ± 7.12 nm. From the size of the crystallites ZnO particles that are formed include nanoparticles. ZnO 1:1 SEM image shows the shape of microrods in the 1:1 ZnO sample while in the 3:1 ZnO sample no microrods are formed. Based on the morphology, the 1:1 ZnO sample has an average size of 230 nm and is larger than the 3:1 ZnO sample which has an average size of 50 nm.
Mengukur Suhu Ruang dan Objek Dengan Menggunakan Suhu Inframerah MLX90614 Berbasis Arduino Liszulfah Roza; Haflan Nur Iman; Fakhira Nursabrina; Adila Nailufar; Ghina El Hidayah; Ahmad Sofyan Sulaeman
TIME in Physics Vol. 1 No. 1 (2023): February
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i1p37-41

Abstract

Temperature measurement is needed in today's laboratory environment. Various sensors have been developed to meet these needs. One of them is an infrared temperature sensor that is used to measure temperature without the need to come into contact with the object whose temperature is to be measured, commonly called contactless. In the project we created, we used the MLX90614 infrared temperature sensor based on Arduino Uno to measure 2 objects alternately, the first is the ambient or room temperature and the second is body temperature. The measurement is carried out without touching and is 1–2 cm from the object being measured. The LCD will display the measurement output in real-time every second using ℃ units. The results of room temperature measurements that have been carried out with the MLX90614 infrared temperature sensor are compared with the results of digital hygrometer room temperature measurements while the results of body temperature measurements carried out with the MLX90614 infrared temperature sensor are compared with the results of thermo gun measurements.
Pengenalan Suara sebagai Pengendali Mobile Robot dengan Metode Adaptive Neuro-Fuzzy Inference System Muhamad Agung Suhendra; Timbo Faritcan Parlaungan; Tedi Sumardi
TIME in Physics Vol. 1 No. 1 (2023): February
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i1p43-49

Abstract

Voice recognition or speech recognition is a biometric technology that has very wide applications, one of which is for simple robot motion control. There are three stages in this research, namely data acquisition, feature extraction, and data classification. For feature extraction, the wavelet transform method is used which can analyze non-stationary and non-linear signals, while for data classification, the Adaptive Neuro-Fuzzy Inference System (Anfis) method is used. The result of data classification is 92.25% and 7.75% error. So, based on the results of the classification accuracy, the robot can be moved via voice commands and to anticipate the error value, the ultrasonic sensor feature is added to the robot as an alternative control.
Measuring creative thingking skills of vocational high school students on dynamic electricity: a case study Roni Permana Roni Permana
TIME in Physics Vol. 1 No. 2 (2023): August
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i2p59-64

Abstract

Creative thinking is a precise significant ability of 21st century education. Consequently, students are essential to must this ability to be applied in physics learning especially in the field of vocational. This study purposes to quantity students' creative thinking abilities about Dynamic Electricity. Examples remained busy by purposive sample method. Applicants in this study were 22 K-12 students of vocational students in Subang city. The implements used are three essay questions with four aspects that are turned off. The results showed that the average value was 43.43 with a low category. Consequently, students' creative thinking skills about Dynamic Electricity are still relatively low.
Inovasi Motor Listrik Untuk Alat Penggilingan Kacang Tanah Rifaldi Rifaldi; Kun Fayakun; Rosalina Rosalina; Emilia Roza; Harry Ramza
TIME in Physics Vol. 1 No. 2 (2023): August
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i2p65-74

Abstract

This research aims to design a control system for a Peanut Grinder based on a 135 Watt AC Motor, intended to assist small and medium-sized food business entrepreneurs who utilize peanut ingredients. The purpose of this device is to enhance production efficiency in the preparation of peanut-based condiments, replacing the manual and time-consuming process with an automated system capable of sorting peanuts into fine and coarse textures as desired. By utilizing a 135 Watt AC Motor obtained from a washing machine as the main driving component, the design aims to reduce costs by reusing existing components. The control system will encompass mechanisms for grinding peanuts efficiently, ensuring user safety, and regulating motor speed and grinding duration. This research emphasizes environmental friendliness by repurposing unused components. Overall, the proposed Peanut Grinder aims to benefit UMKM entrepreneurs by streamlining production processes and enhancing productivity in the peanut-based condiment preparation.
Sumber Energi Listrik Menggunakan Pikohidro Generator Dengan Aliran Air Tandon Farhan Alif; Kun Fayakun; Rosalina Rosalina; Emilia Roza; Harry Ramza
TIME in Physics Vol. 1 No. 2 (2023): August
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2023.v1i2p75-83

Abstract

Electrical energy plays a much needed role in people's lives and economic development. Alternative energy potential, especially water energy, is a solution to utilize it as an energy source. Pico Hydro Power Plant is a tool or medium that uses water. At this time a hydro power generation system is being developed that produces electrical energy, one of which is using a pico hydro generator where the flow rate of water can be converted into electrical energy. In the water piping system at home it is used as a source of electricity, namely where the water reservoir as a reservoir for clean water with water conditions that are affected by the water flow rate can drive a pico-hydro generator turbine. In this research, the data collection process was obtained with a process of taking every 2 minutes for 40 minutes, it obtained an average water discharge of 8.75 L/s with a cross-sectional area of ​​0.0531, so the pico hydro generator can produce an average voltage of 8.88 Volts where the output results are step Up for battery charging and the average power is 10.60 watts on the battery using 3 loads and this research can be used for home lighting.

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