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All Journal International Journal of Evaluation and Research in Education (IJERE) BERKALA FISIKA Jurnal Penelitian dan Pembelajaran Fisika POSITRON Jurnal Pengajaran MIPA Komunikasi Fisika Indonesia Jurnal Pembelajaran MIPA Jurnal Sosioteknologi Jurnal Fisika Unand Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Jurnal Aplikasi Fisika JFA (Jurnal Fisika dan Aplikasinya) Jurnal Pendidikan Fisika Jurnal Edu Research JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika) Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Science and Mathematics Education Jurnal Biologi Tropis JSKK (Jurnal Sains Keolahragaan dan Kesehatan) International Journal of Research in Counseling and Education JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Global Conference Index Jurnal Ilmu Fisika Risalah Fisika Pelita Eksakta Sainstek : Jurnal Sains dan Teknologi Indonesian Journal of Electrical Engineering and Computer Science PAKAR Pendidikan Science and Environmental Journals for Postgraduate Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika BIOCHEPHY: Journal of Science Education Journal of Comprehensive Science Applied Engineering, Innovation, and Technology Journal of Experimental and Applied Physics

Yulkifli Yulkifli

Physics Department, Faculty Of Mathematics And Natural Science, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang, Sumatera Barat 25131, Indonesia

Author-ID : 425281

Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Pembuatan sistem interface digital untuk display data getaran dua dimensi dengan sensor fluxgate ( Making of a digital interface system for displaying two-dimensional vibration data with a fluxgate sensor) Zulpadrianto Zulpadrianto; - Yulkifli; - Yohandri
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

In this article will be discussed about data interface of two-dimensional vibration detection using fluxgate sensors. Making the interface uses two programs are the program MPLAB X IDE V1.70 and Visual Basic programs in C #. MPLAB X IDE V1.70 program is used to program the analog data into digital data and program the data to be able to be connected via USB to a personal computer. Using the Visual Basic programming language C # aims to display digital data on personal computer in real time graphical form and the data stored in the xls extension. This research is a laboratory experiment. Data interface results will be displayed in the form of a graph consisting of vibration detection by fluxgate sensor vertically and horizontally. Extension xls stores data in excel format with the data stored in the form of the maximum scale and the delivery time of data from the vibration detection by fluxgate sensor. The personal computer interface signals for analog data that has been converted into digital data in PIC 18F4550 microcontroller

Pengaruh pengukuran sifat fisis dan sifat mekanis papan partikel sampah daun kering berdasarkan ukuran butir (The effect of measuring the physical properties and mechanical properties of the dry leaf waste particleboard based on grain size) Ade Usra Berli; Yenni Darvina; - Yulkifli
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Utilization of leaf waste processed a drop of without development in the processing. The thought of leaf waste can be processed to become products of economic value, one used as raw material similar lightweight particle board, particle board can be used as a substitute for wood. Particle board manufacturing is done by printing the leaf waste that has been mixed with a binder or adhesive. Adhesives used as binder is polyvinyl acetate (PVAC). Leaf waste material made with a variety of different grain sizes are 1.7 mm, 2.8 mm and 4.75 mm. Particle board manufacturing process is done by inserting the material into the machine hot press with pressure 330 x 104 kg/m2 at 100 ° C for 20 min. From the testing of physical and mechanical properties, obtained the following results: for the physical properties of particle board dry leaf waste, the small grain size of particle board then dried leaf waste moisture content decreases while the value of the density and thickness development is increasing. For the mechanical properties of particle board, the small grain size of particle board then the value of flexural strength and compressive strength increased. Test results obtained water content and density to meet the Standar Nasional Indonesia (SNI 03-2105-2006), while the value of developing strong and thick flexible does not meet the Indonesian National Standard (SNI 03-2105-2006). For compressive strength values no set of Standar Nasional Indonesia. Grain size optimal particle board in this study is the size of a small grain size of 1.70 mm. Keywords: Leaf of Mangoes, polyvinyl acetate (PVAc), Particle board

PERANGKAT PEMBELAJARAN FISIKA BERBASIS MODEL PEMBELAJARAN PROBLEM BASED LEARNING (PBL) DENGAN PENDEKATAN GUIDE INQUIRY PADA MATERI FLUIDA DINAMIS TERINTEGRASI BENCANA ANGIN TOPAN Retno Riyaningtyas; Yulkifli Yulkifli; Ahmad Fauzi
PAKAR Pendidikan Vol 14 No 2 (2016): Published in July 2016
Publisher : Pusat Pengembangan Ilmiah dan Penelitian Mahasiswa Universitas Negeri Padang

This research is motivated importance of community preparedness to face the threat of hurricanes. This research aims to develop devices based learning high school physics teaching model of problem based learning with guided inquiry approach to the material dynamically integrated fluid cyclone with valid criteria, practical and effective. This type of research is a research-development using a model 4-D comprising the steps define, design, develop and dessiminate. In the define phase-end preliminary analysis, the analysis of the students, the task analysis, material analysis and the analysis of learning goals. At the design stage to do the preparation beracuan test criteria, the selection of media, format selection and initial design learning device. On Stage develop expert assessment (validation) and test development (practicalities and effectiveness) learning device. Data were analyzed using descriptive percentages. Results of the research is already successfully developed a learning tool in the form of high school physics syllabus, lesson plans, modules and assessments on integrated dynamic fluid material cyclone with very valid category with a percentage of 94.52%, very practical with a percentage of 88.91% and effectively with the percentage of 78 , 52%.

LKPD Development On MEAs Based-Approach to Improve the Mathematical Representation Ability of Grade X Students Riren Rostari; Irwan Irwan; Yulkifli Yulkifli
International Journal of Research in Counseling and Education Vol 1, No 1 (2017): International Journal of Research in Counseling and Education
Publisher : Universitas Negeri Padang

LKPD used in school had not been optimal in helping students to improve the mathematical representation ability. It happened because the used LKPD was giving a less opportunity to the students to solve the mathematical representation problems. One of the solutions to do about that problem is to develop LKPD-Modeling Eliciting Activities (MEAs) based approach. The purpose of this study is to produce a valid, practical and effective LKPD-MEAs based approach to improve the students’ mathematical representation. This study is a development research using Plomp model which consists of Preliminary Research, Development or Prototyping and Assessment Phase. The subjects of this study were X grade students of SMAN 3 Padang. The instruments used were LKPD validation sheets, teacher’s response questionnaires, students’ response questionnaires and test. The result of this study is a valid, practical and effective LKPD-MEAs based approach with an average of each is 0,728, 85,39 and 82,41.

PENGEMBANGAN THERMOBALANCE DIGITAL BERBASIS TEKNOLOGI SENSOR DAN LEMBAR KERJA PESERTA DIDIK (LKPD) UNTUK PEMBELAJARAN MATERI SUHU DAN KALOR Yulkifli Yulkifli; Usmeldi Usmeldi; Yohandri Yohandri; Anggraini Anggraini
Jurnal Pengajaran MIPA Vol 22, No 1 (2017): JPMIPA: Volume 22, Issue 1, 2017
Publisher : Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18269/jpmipa.v22i1.8378

An understanding of temperature and heat concept is one of the learning objectives in the 2013 Curriculum and the complexity of these concepts requires learning tools that can help students in achieving this objective. In this article, we discussed the development of digital thermobalance and student worksheets (LKPD) as supporting tools for learning temperature and heat concepts. The evaluation results showed that digital thermobalance and LKPD developed in this study have proven to be valid, practical, and effective. Findings from this evaluation showed the potential of digital thermobalance and LKPD as a learning media for temperature and heat subject. ABSTRAKPemahaman tentang konsep materi dan suhu adalah salah satu tujuan pembelajaran dalam Kurikulum 2013 dan kompleksitas materi ini menuntut adanya perangkat pembelajaran yang dapat membantu peserta didik dalam mencapai tujuan tersebut. Dalam artikel ini, kami akan memaparkan pengembangan thermobalance digital dan Lembar Kerja Peserta Didik (LKPD) sebagai penunjang pembelajaran suhu dan kalor. Hasil evaluasi menunjukkan bahwa thermobalance digital dan LKPD yang dikembangkan dalam penelitian ini telah terbukti valid, praktis, dan efektif. Temuan hasil evaluasi tersebut menunjukkan potensi thermobalance digital dan LKPD sebagai media pembelajaran materi suhu dan kalor.

The Validity and Practicality of the E-Book Science Model RADEC (Read-Answer-Discuss-Explain-Create) to Improve the 4C Skills of Students Rissa Pramita; Yulkifli Yulkifli
Jurnal Penelitian Pendidikan IPA Vol. 9 No. 10 (2023): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i10.4337

Quality human resources are the main goal of a nation's ability to compete. The demands of the 21st century also require quality human resources. Therefore, learning resources are needed that support students' 4C skills. The purpose of this research is to develop learning resources in the form of science e-books that have been tested for validity and practicality. The type of research used is research and development, using the ADDIE development model. In the ADDIE development model, there are five stages, including analysis, design, development, implementation, and evaluation. The validity of the Science E-Book uses the Aiken's V scale, and the practicality of the Science E-Book uses the Likert scale. Based on the results of the data analysis conducted, the validity and practicality results were obtained as follows. The results of e-book validity tests by experts were obtained at 0.88. The results of the teacher's practicality were obtained at 89.25%, and the results of the students' practicality were obtained at 88%. So it can be concluded that the RADEC model-based science e-book (Read-Answer-Discuss-Explain-Create) is valid and practical to use in science learning and to improve the 4C skills of junior high school students.

IoT-based viscometer fabrication using the falling ball method for laboratory applications Alwi Nofriandi; Yulkifli Yulkifli; Asrizal Asrizal; Nur Anisa Sati’at
Indonesian Journal of Electrical Engineering and Computer Science Vol 34, No 1: April 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v34.i1.pp89-97

This study outlines the production procedure of internet of things (IoT)- enabled viscometers designed for laboratory use. These viscometers utilize photodiode sensors, lasers, and falling ball techniques. The system is equipped with a temperature sensor that is utilized to quantify the impact of temperature on viscosity. The temperature sensor’s characterization yielded a R-square value of 0.999. The photodiode and laser sensors are utilized to operate a timer within the system, ensuring precise time measurement. The R-square value for the sensor characterization is 0.996. A viscometer equipped with an integrated IoT module for seamless wireless transmission of data. The photodiode timer sensor has an accuracy of 95.76% and a precision of 99.96%, while the temperature sensor has an accuracy of 99.43% and a precision of 99.93%. The viscometer transmits the measured viscosity data to the server using wireless technology. This IoT viscometer has the potential to enhance the efficiency and precision of liquid viscosity measurement in laboratory settings. Additionally, it enables real-time monitoring and data collection for subsequent analysis and research purposes.

Rancang Bangun Sistem Kontrol dan Monitoring Suhu Udara Pada Smart Farming Stroberi Berbasis IoT Mutia Oktaviani, Annisa; Yulkifli, Yulkifli; Nofriandi, Alwi
Jurnal Pendidikan Tambusai Vol. 7 No. 3 (2023): Desember 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v7i3.10683

Teknologi berperan penting pada sektor pertanian di Indonesia, teknologi meningkatkan efisiensi dan pertumbuhan ekonomi, terutama untuk komoditas buah-buahan seperti stroberi. Stroberi dapat tumbuh dengan baik pada daerah beriklim subtropis. Stroberi dari segi teknis membutuhkan kondisi lingkungan tumbuh yang sejuk dan lembap, dengan suhu optimal berkisar antara 22 hingga 28°C. Sehingga penanaman stroberi di daerah iklim tropis bersuhu tinggi seperti di Kota Padang akan sulit dilakukan. Oleh karena itu, Smart Farming berbasis IoT merupakan solusi untuk mengontrol dan memonitoring suhu udara pada tanaman stroberi di daerah tropis. Penelitian ini tergolong kedalam penelitian rekayasa. Penelitian ini menggunakan NodeMCU ESP8266, sensor DS18B20, kipas, dan Blynk. Sistem yang dirancang mencapai ketepatan rata-rata 99,48%, menunjukkan akurasi tinggi. Ketelitian sistem mencapai 0,9993 dengan tingkat ketelitian 0,01. Pengujian sistem kontrol menunjukkan bahwa kipas hidup saat suhu di atas 22°C dan mati saat di bawah 22°C, sesuai dengan set point yang ditetapkan.

Heavy Metals Contamination and the Evolution of Environmental Policy: A Comprehensive Bibliometric Reviews Nofriandi, Alwi; Frinaldi, Aldri; Lanin, Dasman; Rembrandt, Rembrandt; Yulkifli, Yulkifli; Dewata, Indang; Siregar, Dewi Rahmadani; Insani, Munadia; Sati’at, Nur Anisa; Febrina, Suci
Science and Environmental Journal for Postgraduate Vol 7 No 1 (2024): Science and Environmental Journals for Postgraduate (SENJOp)
Publisher : Postgraduate School, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/senjop.v7i1.273

This study investigates the relationship between heavy metal pollution and environmental policy through a bibliometric analysis of research published between 2009 and 2023. Heavy metal contamination, involving toxic elements such as lead, cadmium, and mercury, poses significant risks to human health and ecosystems, particularly in areas of intensive industrial activity. The study aims to assess research trends, policy advancements, and collaborative networks to identify gaps and propose future directions. Data were extracted from Scopus, employing keywords like “heavy metals” and “environmental policy”. Biblioshiny software facilitated analyses of publication trends, geographic distribution, co-authorship networks, and citation impact. The findings reveal a marked increase in research output from 2015, driven by international policy initiatives like the Minamata Convention. China leads in publication volume, reflecting its industrial challenges, while other nations like India and Brazil emphasize collaborative efforts. Keyword analyses highlight themes such as health risks, pollution monitoring, and policy evaluation. The study underscores the critical role of global cooperation in addressing pollution through innovative technologies and effective policies.Future research should explore the impact of climate change on heavy metal mobility, long-term health effects, and the integration of AI and IoT in environmental monitoring. These steps are vital for advancing sustainable solutions to mitigate heavy metal pollution.

Simulator Gempa Menggunakan Konsep Vibrating Table Berbasis Sensor MPU6050 Audia, Washilla; Yulkifli, Yulkifli; Nofriandi, Alwi; Yohandri, Yohandri; Ahadi, Suaidi
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.76159

Indonesia merupakan salah satu negara dengan wilayah berpotensi gempa tertinggi di dunia, yang sering kali menimbulkan kerugian besar. Simulator gempa berbiaya rendah menjadi topik penting dalam berbagai penelitian untuk mendukung mitigasi bencana. Oleh karenanya, pengembangan dan pengujian vibrating table semakin banyak dilakukan di pusat penelitian teknik gempa di seluruh dunia. Penelitian ini bertujuan untuk mengembangkan simulator gempa berbasis konsep vibrating table yang hemat biaya, mudah digunakan, dan akurat, dengan memanfaatkan sensor MPU6050 untuk karakterisasi getaran. Sistem ini menggunakan motor DC sebagai sumber getaran, sementara sensor MPU6050 mendeteksi getaran yang terjadi saat simulator diujikan dan mengukur percepatan getaran yang dihasilkan. Purwarupa yang dikembangkan ini kemudian dikalibrasi menggunakan vibration meter sebagai alat ukur standar. Pada penelitian ini ditemukan bahwa variasi kecepatan putar motor (rpm) memengaruhi hasil respons dari percepatan getaran (m/s2) pada prototipe simulator gempa dan memiliki hubungan berbanding lurus. Simulator ini memiliki tingkat ketepatan 96,1% dan ketelitian 99,6% setelah kalibrasi. Dengan demikian, purwarupa ini mampu menyimulasikan gempa dengan respons getaran yang akurat dan menjadikannya solusi yang memiliki potensi dalam pengembangan teknologi mitigasi bencana yang terjangkau dan efektif.

Co-Authors - Asrizal -, Vauzia - Abdul Razak Ade Usra Berli Afrianda, Teguh Ahmad Fauzi Ainur Rizki, Iqbal Aldri Frinaldi Alizar, Alizar Alwi Nofriandi Aminuyati Andi Alatas, Andi Anggraini Anggraini Anwar, Suci Armiati Armiati Asrizal Asrizal A Audia, Washilla Aulia Asman Az-Zahra, Khalishah Raudhatul Azmi Asra, Azmi Dasman Lanin Delvi Ayu Wulandari Desmiwati, Riti Didik Hariyanto Djusmaini Djamas Djusmaini Djamas Djusmaini Djamas Dona, Afrini Dwina Melisa Elisia, Rini Fadilla Meidita Fanny Rahmatina Rahim Fauzi, Wulan Aulia Febrina, Suci Festiyed Fevria, Resti Fevria, Resti - Fimatesa Windari Fitra Netti Frans Rizal Agustiyanto Gabe, Totop Habibi Putra Hamid, Bushra Harman Amir Hatthoahira . Heron Tarigan Hufri Hufri Ilyas Muhammad Isa Indang Dewata Insani, Munadia Irwan Irwan Isa, Ilyas Muhammad Junita, Novia Khoirun Nisa Kitty Mulyati Chania Lily Handayani Mairizwan, Mairizwan Maria Idayu Matondang, Anggun Sisri Br. Md Isa, Illyas Melia Vivi Ningrum Mimo Putra Ardiansyah Mitra Djamal Muhammad Irfan Muhammad Rivai Murtiani Murtiani Mutia Oktaviani, Annisa Mutia Risma Nadi Suprapto Nadya Pratiwi Nofi Yendri Sudiar Nofi Yendri Sudiar Nur Anisa Sati’at Nur Nahdia, Vivi Nur Suci Eka Putri Nurry Putri Tissos Nurul Ihsan Pramita, Rissa Pratama, Rayvol Dion Pratiwi, Nadya Puja Kahar Putri Diana Putri Oktavia Putri, Santi Diana Putri, Sylvia Delfi Mardiana Putri, Widya Janatul Rahmadani, Febbi Rahmondia N. Setiadi Ramadhiani, Dhea Dinda Rambe, Indah Anggraini Ramli Ramli Rembrandt, Rembrandt Renol Afrizon Renti Surya Retno Riyaningtyas Rezy Prima Riren Rostari Rissa Pramita Roni Jarlis Ruci Ardi Samudra, Elmi Yanto Adhar Sania, Hani Sari, Mona Berlian Sati’at, Nur Anisa Septian Rahman Hakim Shabrina Amalia Siregar, Dewi Rahmadani Sri Mutiar, Sri Stivani Suherman, Dea Suaidi Ahadi Susalam, Malikil Kudus Suyatno, Suyatno Teguh, Teguh Afrianda Ulianas, Alizar Usmeldi Usmeldi Vauzia, Vauzia Venny Haris Violita Violita Widya Janatul Putri Widyaningrum Indrasari wita nirmala Yanti, Nurfitriza Yardani Adi Cosra Yenni Darvina Yohandri Yohandri Bow Yolanda . Yolanda Karinia Yosa aulya putri Yudha, Fauzan Syafril Yusri, Wilda Triputri Zul Anwar Zul Fahmi, Hafizhuddin Zulhendri Kamus Zulpadrianto Z Zurian Affandi

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