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The Content of Magnetic Material in Black Sand of Yeh Gangga Beach Rachmawati, Dewi Oktofa; Gunadi, Gede Aris; Risha, Nurfa; Suswandi, Iwan
Jurnal Fisika Vol 13, No 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v13i2.47816

Yeh Gangga Beach is one of the black sand beaches in the Tabanan district. The abundant black sand on this beach stretches along the shoreline with varying grain sizes. This black sand characterizes the specific surface composition as iron sand deposits with high magnetic mineral content. The very high need and use of magnetic minerals in various fields prompt a study of the magnetic mineral content in the black sand of Yeh Gangga beach.The magnetic material content was determined by the extraction method which was expressed in terms of mass fraction. The grain size distribution was determined by the sieve method using a sieve shaker consisting of six mesh numbers, namely 30, 100, 170, 200, 270, and 325.The density of magnetic materials was determined by the principle of mass and volume ratio. The magnetic susceptibility was tested by using a Bartington MS2B susceptibility meter. Meanwhile, the characterization of the elements and their oxides used non-magnetic methods, namely the X-Ray Fluorescence test.The research results show that the magnetic material fraction of Yeh Gangga black sand reach 84.84% with 58.39% of the grains having sizes in the range 150r ≥90 μm. The magnetic susceptibility value is 28.26 10-6 m3/kg with an Fe element content of 85.15% w. The hematite (Fe2O3) content reaches 81.69%. This magnetic material has a density of 1914.43 kg/m3.

The Potential for The Development of Augmented Reality Media to Increase Student Understanding of Earthquake Material Zakirman, Zakirman; Sukmayadi, Dodi; Widiasih, Widiasih; Risha, Nurfa
Jurnal Ilmiah Profesi Pendidikan Vol. 8 No. 4 (2023): November
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jipp.v8i4.1672

Along with the development of technology, the use of smartphones in teaching and learning activities has become one of the most influential innovations in the world of Education, especially in physics learning. Learning media is needed to make it easier for students to understand physics concepts, but media that can visualize abstract concepts clearly have not been developed much. As an alternative media, Augmented Reality was chosen as a solution to this problem. This type of research is descriptive qualitative and aims to describe the potential for the development of augmented reality media to increase students' understanding of earthquake material. Data collection techniques using questionnaires. The questionnaire was made using G-Form containing six question items, each of which required a response in the form of a checklist or description in each item answer column according to the respondent's opinion. The questionnaire was distributed online to respondents who were students of Universitas Pendidikan Ganesha and Universitas Terbuka. The sample was randomly selected as many as 206 students who had attended the lecture wave. Research conclusions can be drawn after analysis of questionnaires filled out by respondents. Based on data analysis, it can be understood that the media / learning resources on wave material so far used by lecturers are powerpoint (PPT) with a percentage of 14%, the media used so far is considered by students to be less attractive 22%, the obstacles encountered by students are at most visualizing wave forms 27%, the media that students consider appropriate for wave material is through visualization / illustration with a maximum percentage of 61%, so that AR media is considered to have the potential to make wave material interesting and easy to understand.

Peninjauan Karakteristik Panel Surya Monocrystalline 50 WP di Kota Singaraja Valentina, Diah Novita; Maheni, Ni Ketut Lisa; Wahyuningtias, Bela Eka; Risha, Nurfa; Yasmini, Luh Putu Budi
Wahana Matematika dan Sains: Jurnal Matematika, Sains, dan Pembelajarannya Vol. 18 No. 3 (2024): Desember 2024
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/wms.v18i3.89408

Seiring dengan meningkatnya kebutuhan akan sumber energi terbarukan, penelitian ini bertujuan untuk mengetahui karakteristik panel surya yang dilihat dari efisiensi yang dihasilkan oleh panel surya monocrystalline 50 watt peak (WP) di kota Singaraja. Penelitian dilakukan di Kota Singaraja tepatnya di Laboratorium Terpadu Universitas Pendidikan Ganesha. Jenis penelitian ini adalah penelitian eksperimen yang dilakukan dengan mengambil data daya input dan output panel surya yang dipasang dengan kemiringan 0o terhadap permukaan tanah. Hasil penelitian awal panel surya yang dipasang menunjukkan bahwa daya output tertinggi diperoleh pukul 12:00 sebesar 39,63 Watt. Daya output terendah diperoleh pukul 09:00 sebesar 17,12 Watt. Efisiensi tertinggi diperoleh pukul 12:00 sebesar 12,72% dan efisiensi terendah diperoleh pukul 09:00 sebesar 10,28%. Daya output dan efisiensi yang bervariasi tergantung pada waktu (yang terkait dengan posisi matahari) dan intensitas cahaya matahari yang diterima. Kata kunci : daya output; efisiensi; monocrystalline ; panel surya .

PERBANDINGAN KONSTANTA ELASTISITAS VIRUS HIV-1 MATANG DAN HIV-1 BELUM MATANG Yasmini, Luh Putu Budi; Fauzi, Muhammad Rizki; Risha, Nurfa; Gunadi, I Gede Aris
JST (Jurnal Sains dan Teknologi) Vol. 11 No. 2 (2022)
Publisher : Universitas Pendidikan Ganesha

Virus pada aspek fisis masih sangat menarik untuk dikaji berdasarkan konsep Fisika. Salah satu ciri virus adalah kekakuan cangkang virus tersebut. Dalam tinjauan selanjutnya, cangkang virus dapat diasumsikan sebagai pegas. Tujuan dari penelitian ini adalah untuk menganalisis akurasi dan wawasan mengenai kekakuan cangkang virus secara teoretik dengan menggunakan selesaian persamaan Michell. Dalam artikel ini, dikaji nilai kekakuan cangkang virus secara teoretik melalui metode analitik dan simulasi dengan mengkaji berbagai sumber pustaka terkait. Metode analisis didasarkan pada teori plate & shell, serta dibahas mengenai suatu metode analitik lainnya, yakni dengan menggunakan persamaan Michell. Metode simulasi didasarkan pada metode finite element analysis (FEA). Dikaji konstanta elastisitas dua jenis virus, yakni virus HIV-1 (matang) dan HIV-1 (belum matang). Hasil penelitian menunjukkan bahwa virus HIV-1 (matang) memiliki konstanta elastisitas yang lebih kecil bila dibandingkan dengan konstanta elastisitas virus HIV-1 (belum matang). Hal tersebut sangat terkait dengan karakteristik virus tersebut, yakni ukuran, ketebalan, dan sifat instrinsik virus. Virus dengan ketebalan cangkang yang lebih kecil memiliki konstanta elastisitas yang lebih kecil, sehingga lebih efisien untuk menginfeksi sel inang dibandingkan dengan virus yang memiliki konstanta elastisitas yang lebih besar.

Effectiveness of Monocrystalline Solar Panel Tilt Angle to Output Power and Efficiency: Case study for Singaraja-Bali Yasmini, Luh Putu Budi; Valentina, Diah Novita; Risha, Nurfa
JST (Jurnal Sains dan Teknologi) Vol. 14 No. 1 (2025): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v14i1.94203

The tilt angle orientation influences the performance of solar panels. This study aims to determine the optimal tilt angle of solar panels, especially in the Singaraja area, which has the highest efficiency output power. This type of research is experimental research. The subjects involved in this study were monocrystalline solar panels tested at various tilt angles, namely 0°, 10°, 20°, 30°, 40°, 50°, and 60°. The data collection method was carried out by directly measuring the intensity of the incident sunlight and recording the output voltage and current values of the solar panel at each tilt angle variation. The data obtained was then analyzed to determine the output power and efficiency of the solar panel at each tilt angle by comparing the measurement results at various test times so that the tilt angle that produces the best performance under local environmental conditions can be identified. The results showed that the highest output power was obtained at 12:05 a.m. with a 10° tilt angle of 37.43 Watts. The lowest output power was obtained at 9:30 a.m. with a 60° tilt angle of 9.63 Watts. The highest efficiency is produced at an inclination angle of 10° by 11.62%. The lowest efficiency was obtained at a 60° tilt angle of 10.47%. The optimal tilt angle in Singaraja is 10° to produce high output power and good efficiency. Based on these findings, it can be concluded that the tilt angle of solar panels significantly influences the output power and efficiency of monocrystalline solar panels in the Singaraja region of Bali.

THE VALUE OF VISCOSITY COEFFICIENT OF COOKING OIL RESULTED BY PURIFICATION BASED ON ACTIVE CHARCOAL TEMPERATURE WITH THE FALLING BALL METHOD Rachmawati, Dewi Oktofa; Suswandi, Iwan; Risha, Nurfa
Indonesian Physical Review Vol. 5 No. 1 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i1.140

A change in viscosity indicates the damage to cooking oil. The value of the viscosity coefficient indicates the level of viscosity. This value describes the drag caused by friction between the cooking oil molecules to block the flow. The adhesive property of used cooking oil with a high viscosity value is that it is easy to stick to foodstuffs processed with this oil. Used cooking oil is cooking oil with a high viscosity coefficient value. This oil contains free fatty acids that are harmful to the body. Reuse of used cooking oil for frying foodstuffs is not recommended. Purifying used cooking oil is one way to make cooking oil safe to consume again. The surface adsorption capacity of activated charcoal is increased by heating. Activated charcoal activation temperatures are 27oC, 40oC, 50oC, 70oC, and 90oC.The value of the viscosity coefficient of the purified cooking oil is interesting to study for the activation temperature of the activated charcoal used. The falling ball method was chosen to determine the value of the viscosity coefficient. This method measured the time the ball fell in the oil. Data were analyzed quantitatively descriptively and presented in graphical form. The results show that the value of the viscosity coefficient of the purified cooking oil decreases with the increase in the activated charcoal temperature. The value of the viscosity coefficient of cooking oil as a result of purification using activated charcoal at Â 90oC is (0.854 Â±0.004) Â Pa. s

ROTATION COMPONENT OF ROBOTIC MANIPULATOR MOTION IN 4-DOF BY THE QUATERNION METHOD Yasmini, Luh Putu Budi; Isna, Wardah Nur; Risha, Nurfa
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.276

Most of the study of robots is about the system. Because of that, we analyze the motion of the robot by using rigid body motion concepts. This study aims to analyze the rotation components of a robotic manipulator with four degrees of freedom (4-DoF) by using the quaternion method of manual analysis so that the end effector of the robotic manipulator under study is obtained. The research is theoretical and was conducted through a review and analysis of related literature. Based on the literature review, the robotic manipulator is a robot with a shape resembling an arm. The robotic manipulator consists of bases, links, joins, and an end effector. In terms of physics, the kinematics of robot motion can be studied based on the concept of rigid body motion. The research shows that the quaternion method can be used to determine the end effector of the rotation component of the robotic manipulator, and the steps are shorter than analyses by using screw and twist theory. Based on this case, the end effector of the rotation component depends on the initial state and the total rotation angle of each join.

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