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All Journal Jurnal Ilmu Dasar Journal of Mathematical and Fundamental Sciences Science and Technology Indonesia JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika) Jurnal Penelitian Pendidikan IPA (JPPIPA) Spektra: Jurnal Fisika dan Aplikasinya JURNAL EKSAKTA PENDIDIKAN (JEP) Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Journal of Social And Economics Research journal of social and economic research
Ramli Ramli
Universitas Negeri Padang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy 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 Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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STRUKTUR MIKRO DAN SIFAT MAGNETIK DARI LAPISAN TIPIS NANOKOMPOSIT Fe3O4/PVDF Ramli Ramli; Nidya Yulfriska; Yenni Darvina; Yulkifli Yulkifli; Edi Sanjaya; Ambran Hartono
Spektra: Jurnal Fisika dan Aplikasinya Vol 3 No 3 (2018): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 3 Issue 3, December 2018
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (425.056 KB)

Abstract

Artikel ini berhubungan dengan laporan pembuatan lapisan tipis nanokomposit Fe3O4/PVDF (Poly Vinylidine Fluoride) dengan fraksi berat nanopartikel Fe3O4 yang berbeda. Nanokomposit Fe3O4/PVDF disiapkan menggunakan metode sol-gel dan kemudian ditumbuhkan menggunakan alat spin coating di atas substrat kaca. Lapisan tipis nanokomposit Fe3O4/PVDF dikarakterisasi menggunakan XRD, FTIR, SEM, dan VSM untuk menentukan struktur mikro dan sifat magnetiknya. Fraksi berat nanopartikel Fe3O4 dalam matriks PVDF berpengaruh pada struktur mikro dan sifat magnetik nanokomposit. Hasil karakterisasi XRD dan FTIR menunjukkan bahwa nanokomposit telah terbentuk dan telah terjadi interaksi antara pengisi (Fe3O4) dengan molekul polimer PVDF. Morfologi permukaan nanokomposit memperlihatkan bentuk sperulus (spherulites) dan lamela radial. Analisis kurva histeresis dari nanokomposit Fe3O4/PVDF menunjukkan magnetisasi saturasi dari lapisan nanokomposit Fe3O4/PVDF bertambah dengan bertambahnya konsentrasi Fe3O4 dalam sampel. Pengaruh fraksi Fe3O4 dalam sampel nanokomposit Fe3O4/PVDF terhadap sifat struktur mikro dan sifat magnetik sampel dilaporkan secara rinci dalam artikel ini.
Effect of The Volume of Banana Fiber As A Polymer Composite Amplifier With Polyester Resin Matrix On The Sound Absorption of Acoustic Materials rizka fauziah; - Ramli; Yenni Darvina; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 1 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12561171074

Abstract

Research has been carried out on the banana fiber effect as a polymer composite amplifier with polyester resin matrix on the sound absorption of acoustic materials. Sound Absorber material is made with a variation in the volume of banana fiber that is different from polyester resin. The volume of banana fiber  and polyester resin used  is  15% Fiber:    85%  Polyester Resin,  20%  Fiber:  80%  Polyester Resin, 25% Fiber: 25%  Fiber:    75%   Resin Polyester, 30%  Fiber:    70%  Polyester Resin, 35%  Fiber:    65%  Polyester Resin. So when made composite then the amount of banana fiber used and polyester resin is 100%. Research methods are carried out in the collection of banana fiber, composite manufacturing and testing of sound absorption properties using impedance tubes. The testing of coefficient sound reflection and also sound absorbance coefficient testing is done using sound level meter and signal generator by reference to principle the method of tube impedance via approach to the acoustic box. The banana fiber composite result and polyester resin are able to reflect the sound of highest which is 0.44 in a frequency 500 Hz with fiber 15%. While lowest sound reflection coefficient is 0.06 at a frequency of 8000 Hz and fiber 35%. While in the test the highest value absorbance coefficient that absorbs sound  is  =  0.94 at fiber volume  35%,  and frequency 8000 Hz, while the lowest sound coefficient is 0.56 in fiber 15% and frequency 500 HZ
Structure Analysis Of Graphene Micro Oxide From Old Coconut Shell Waste Rika Nanda; - Ramli
PILLAR OF PHYSICS Vol 15, No 1 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12600171074

Abstract

Synthesis of graphene oxide from old coconut shell waste material. It has many applications, one of which is used as a microwave absorber. Old coconut shells are used as waste because the ingredients are easy to get. This study aims to analyze the microstructure of graphene oxide from old coconut shell waste. In the carbonization process using a furnace with temperature variations from 250˚C to 450˚C, the furnace time is 120 minutes. Making activated charcoal from old coconut shells using the modified hummers method with oxidizing agents KmnO2, H2SO4, and NaNO3. Characterization of graphene oxide from old coconut shell waste using FTIR, XRD and SEM. The test results using FTIR on GO samples show the formation of GO material where the sample contains functional groups containing bonds between carbon (C), Hydrogen (H) and Oxygen (O), the highest crystal size on XRD is 43.20800529 nm, and particle size the best SEM was obtained at GO 250˚C with a particle size of 65.701671 nm where the larger the particle size, the larger the surface pores of the sample, so that the better microwave absorbent was produced.
PRELIMINARY RESEARCH PENGEMBANGAN MODUL BERBASIS PROBLEM BASED INSTRUCTION PADA MATA KULIAH FISIKA MATEMATIKA I DI STKIP PGRI SUMATERA BARAT Iing Rika Yanti; Silvi Trisna; Usmeldi Usmeldi; Ramli Ramli
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (452.491 KB) | DOI: 10.21009/0305010205

Abstract

Mathematical Physics I is one of subjects for Physics Education’s department on STKIP PGRI West Sumatra. Mathematical Physics give you the basics of mastering the mathematical methods used in discussing the physical phenomena of nature. This course requires students to work hard in mastering the concept given. Therefore we need a teaching material in the form of modules that are effective in improving student understanding of concepts. Modules that developed serves to improve the mindset of students to think critically, creatively, and innovative (Problem Based Instruction). Students are given the opportunity to develop their creative ideas in solving the problems that can develop critical thinking skills, so that students are able to associate the concept of mathematics with physics concepts. In this research, preliminary analysis in the form of a needs analysis and analysis of concepts or content, and assessment of the necessary literature in the lecture. Analysis of the concept aims to define the content and course materials are needed in developing the module. In the study of literature in the form of an assessment of the existing teaching materials to be developed for the better. Based on the initial investigation (preliminary research) performed on students and colleagues agree to the development of module-based Mathematical Physics 1 Problem Based Instruction as teaching material in the lecture. Keywords:Preliminary Research, PBI, Mathematical Physics I
PENERAPAN PENDIDIKAN KARAKTER AKHLAK MULIA PADA PERUBAHAN TINGKAH LAKU SISWA KELAS XI JURUSAN TEKNIK MESIN DI SMK NEGERI 1 TANJUNG RAYA Ramanda Fazrian; Ramli; Syafri Jamain
Journal of Social and Economics Research Vol 3 No 2 (2021): JSER, December 2021
Publisher : Ikatan Dosen Menulis

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (308.293 KB) | DOI: 10.54783/jser.v3i2.29

Abstract

Penelitian ini bertujuan untuk mendapatkan informasi dan mendiskripsikan penerapan pendidikan karakter akhlak mulia sebagai upaya pembentukan karakter siswa di SMK Negeri 1 Tanjung Raya dilihat dari: 1) Aktifitas yang dilakukan siswa setiap hari di Sekolah. 2) Upaya guru dalam menerapkan pendidikan karakter akhlak mulia pada siswa. 3) Dampak dari penerapan pendidikan karakter akhlak mulia pada siswa. Jenis penelitian ini adalah penelitian kualitatif dengan menggunakan metode deskriptif. Untuk menjawab permasalahan penelitian tentang penerapan pendidikan karakter akhlak mulia pada perubahan tingkah laku siswa kelas XI Jurusan Teknik Mesin di SMK Negeri 1 Tanjung Raya, peneliti mengumpulkan data dari 37 orang siswa dengan melakukan observasi dan wawancara secara tertulis dan wawancara secara lisan dengan subjek penelitian siswa kelas XI Jurusan Teknik Mesin SMK Negeri 1 Tanjung Raya. Hasil penelitian mengungkapkan data sebagai berikut: 1) Penerapan pendidikan karakter akhlak mulia pada perubahan tingkah laku siswa dapat dilihat dari aktivitasnya sehari-hari di sekolah. Hal itu terlihat dengan adanya aturan tata tertib di sekolah yang mengharuskan siswa untuk memiliki akhlakul karimah, baik yang berhubungan dengan Tuhan, diri-sendiri, keluarga, masyarakat maupun alam sekitar. 2) Upaya yang dilakukan oleh guru di sekolah dalam menerapakan karakter akhlak mulia adalah dengan memberikan pengarahan kepada siswa tentang apa yang harus dilakukan dan apa yang tidak boleh dilakukan, hal itu harus dilakukan secara berkelanjutan. Untuk melakukan hal itu, harus ada kerja sama antara wali kelas, guru BK dan seluruh komponen sekolah. 3) Dampak dari penerapan pendidikan karakter akhlak mulia ini adalah terjadinya perubahan akhlak siswa ke arah yang lebih baik. Siswa bisa lebih dekat dengan Tuhannya, dirinya sendiri, keluarga, masyarakat dan alam sekitar. Dengan adanya sikap seperti itu siswa menjadi bisa memilah mana perbuatan yang berdampak positif terhadap dirinya yang harus dikerjakan dan mana perbuatan yang berdampak negatif terhadap dirinya yang harus ditinggalkan.
PENGARUH KESIAPAN MENGAJAR TERHADAP SIKAP DALAM MENGAJAR MAHASISWA PENDIDIKAN TEKNIK MESIN ANGKATAN 2012 FAKULTAS TEKNIK UNIVERSITAS NEGERI PADANG Hifnul Rizky Al Ulfa; Ramli; Yufrizal
Journal of Social and Economics Research Vol 2 No 2 (2020): JSER, December 2020
Publisher : Ikatan Dosen Menulis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54783/jser.v2i2.46

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh dan seberapa besar pengaruh kesiapan mengajar terhadap sikap dalam mengajar mahasiswa Pendidikan Teknik Mesin angkatan 2012 FT UNP. Penelitian ini dilatar belakangi oleh kesiapan dan sikap dalam mengajar mahasiswa Pendidikan Teknik Mesin angkatan 2012 FT UNP yang relatif masih rendah. Hal ini terlihat dari masih adanya mahasiswa yang kurang dan masih belum menguasai beberapa aspek sikap dalam mengajar. Seperti keterampilan menggunakan variasi, keterampilan memberikan penguatan, dan sikap dalam menjelaskan yang dapat dilihat pada saat perkuliahan metode mengajar khusus pada semester yang lalu dan observasi yang telah penulis lakukan kepada beberapa mahasiswa yang sedang praktek mengajar disekolah. Metode yang digunakan adalah pengujian prasyarat analisis yang terdiri dari uji normalitas dan uji linearitas serta uji hipotesis yang menggunakan teknik analisis regresi sederhana dan uji T. Hasil analisis menunjukkan: (1) terdapat hubungan positif antara kesiapan mengajar dengan sikap dalam mengajar. (2) Koefisien regresi variabel kesiapan mengajar (X) sebesar 0.689 (3) jika kesiapan mengajar mengalami kenaikan satu satuan, maka sikap dalam mengajar (Y) akan naik sebesar 0.689 satuan (4) nilai T hitung > T tabel (3.206 > 2.017) maka Ha ditolak (5) bahwa ada pengaruh secara signifikan antara kesiapan mengajar dengan sikap dalam mengajar
Microwave Absorption Properties of Graphene Oxide Derived from Coconut Shell Waste by Modified Hummer's Method Nadia Ardianti; Yenni Darvina; Fadhila Ulfa Jhora; - Ramli
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12601171074

Abstract

Coconut shells are organic waste, so they can be used as an alternative for carbon source. In this study, the synthesis of graphene oxide (GO) from coconut shell waste will be carried out. The results of the synthesis of GO will then be tested for microwave absorbing properties because it can be applied in various fields, such as information technology, medical equipment, industry, polymer synthesis, and organic synthesis. GO synthesis was carried out using the modified Hummers method. There are several stages in this study, namely the stage of preparing old coconut shells, the stage of carbon activation, the stage of GO synthesis, and the stage of sonication and neutralization of GO. The coconut shell was treated with variations in the sintering temperature to see its effect on the microwave absorbing properties. The sintering temperatures used in this study were 250°C, 300°C, 350°C, 400°C, and 450°C. GO characterization was carried out using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Vector Network Analyzer (VNA) to determine the phase, functional groups, and microwave absorption properties of GO. In the results of GO characterization using VNA, it was found that there was an effect of temperature variations. GO can be synthesized from old coconut shell waste using the modified Hummers method and has a GO phase result. The best microwave absorbing properties are at a sintering temperature of 400°C with a reflection loss value of -24.40 dB. Absorbing coefficient 93.97% at 10.40 GHz
Design and Development a Smart Control System for Temperature and Turbidity of Bio Floc Fish Ponds Ambran Hartono; Ahmad Rofiq; Jalu Ahmad Prakosa; Ramli Ramli; Syafrijon Syafrijon
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 24 No. 02 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol24-iss02/400

Abstract

Bio floc aquaculture techniques are present as a solution to increase the productivity of fish farming. However, until now there are still problems, namely regarding the quality of the water from the pond. In this study, a monitoring tool was designed using an ESP32 microcontroller with the support of a BME280 sensor, RTD PT100 to measure water temperature and a turbidity sensor to measure floc volume. Furthermore, this sensor is planted on Wi-Fi to be able to connect to the internet network for IoT applications so that it can be monitored in real time. Likewise, the display results from the monitoring of the application system are directly read on the Google sheet display and in real time. From the test results of the system built, obtained the accuracy level of the BME280 sensor is 96.5%, PT100 RTD is 94.6% and for the turbidity sensor is 98%. Meanwhile the observed air temperature value can reach 34.36°C, the water temperature reaches 28.75°C, and the floc ratio reaches 30.15 mL.L-1. From the results shown, it clearly indicates that the water quality monitoring system has been successful and is working very well.
Preliminary Study: Development of STEM-Based E-Students Worksheet to Improve Learners' Science Literacy Skills Nurul Hasanah Daniyah Putri; Ramli Ramli
Jurnal Penelitian Pendidikan IPA Vol 9 No 4 (2023): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i4.3011

Abstract

The purpose of this study was to describe the results of the needs analysis for the development of e-Students Worksheet based on the STEM approach to improve the science literacy skills of students in several high schools in Padang City. This research design uses the R&D method by using the Plomp development model which consists of three steps, namely: 1) preliminary research; 2) prototyping phase, and 3) assessment phase. The instrument used in this research is a questionnaire validation sheet filled out by educators and students. Based on the analysis of the results of preliminary data observations conducted in several high schools in Padang City, the results obtained are in the analysis of graduate competency standards, assessment, learning activities have an average percentage with a very good category. However, in the analysis of students, the STEM approach, the use of electronic teaching materials, and science literacy generally have an average percentage that is in the sufficient category. To overcome the existing problems educators can develop STEM-based e-Students Worksheet to improve students' scientific literacy
The Characterization of the Hydrophobic Surface of Nanocomposites Aloe vera/PS for Antimicrobial Pathogens Lathifa Zonesya Putri; Ratnawulan Ratnawulan; Ramli Ramli; Hamdi Rifai; Faridah Lisa Supian; Irna Humairah
Science and Technology Indonesia Vol. 8 No. 2 (2023): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2023.8.2.212-218

Abstract

The spread of pathogenic microorganisms on a large scale creates a health disaster for the world. Modifying the surface of the fabric so that it is antimicrobial pathogens with hydrophobic properties is one solution to inhibit the spread of microorganisms. Surface modification was carried out using Aloe vera powder as filler and polystyrene matrix with Aloe vera:PS composition variations of 1:5, 2:5, and 3:5 using the dip coating method and drying temperatures of 10◦C, 50◦C, and 90◦C. The characterization results that have been carried out with the best composition variations are 3:5 and 50◦C with a layered morphology using Scanning Electron Microscopy (SEM), resulting in a surface particle size of 21.243 nm, large contact angle/WCA using a Canon D350 camera with a size of 150.23◦, Fourier Transmission Infrared Analysis (FTIR) with the dominant functional group in the vibration band 2629 cm−1 indicates the presence of a long hydroxyl chain, the vibration band 1500 cm−1 with C-H stretching of the aromatic ring is caused by the characteristics of the polystyrene polymer and the wave number is 1700 cm−1 with stretching C=O which shows the characteristics of the carbonyl group in the Aloe vera sample is a flavonoid compound. The resistance of Aloe vera/PS solution to Klebsiella pneumonia resulted in a 20.18 mm diameter barrier showing strong resistance against bacteria and X-Ray Diffraction analysis showed that the AV powder was amorphous. Thus, the AV/PS 3:5 composition with a calcination temperature of 50◦C represents the greatest variation in the synthesis and characterization of hydrophobic thin films for pathogenic antimicrobial organisms.
Co-Authors - Helmita - Rahmi - Yulkifli Adli Dzil Ikhram Ahmad Aminudin Ahmad Fauzi Ahmad Rofiq Ambran Hartono Ambran Hartono Ambran Hartono arifaldi arifaldi Asrizal Bevi Lidia Cici Dwi Tisa Haspen Cuk Imawan Dadang Dadang Desnita Dessi Verawati Djusmaini Djamas Djusmaini Djamas Djusmaini Djamas Edi Sanjaya Edi Sanjaya Elvida Yulia Fadhila Ulfa Jhora Faridah Lisa Supian Fatni Mufit Fildzah Rudyah Putri Nurzam Fitri Anika Freddy Haryanto Gusmita Cahnia Putri Gusnedi Gusnedi Hamdi Rifai Hanana Laila Burhan Haryona Delvita Herman Bahar Hidayati Hidayati Hifnul Rizky Al Ulfa Iing Rika Yanti Imron Maulana Indah Septia Ningsih Irna Humairah Jalu Ahmad Prakosa Khairunnisa Khairunnisa Khairurrijal Khairurrijal Lathifa Zonesya Putri Letmi Dwiridal Lucya Sinurat Mahrizal Mahrizal masril masril Mitra Djamal Mitra Djamal Mitri Selisne Moulia Fadhilah Muhammad Yogi Rivano Nadia Ardianti Nadya Aztifa Nidya Yulfriska Nurhafizah Nurhafizah Nurul Hasanah Daniyah Putri Onny Gustira Puja Kahar Putri Auliyani Putri Diana Rahadian Zainul Rahmat Hidayat Ramanda Fazrian Ratnawulan . Renol Afrizon Ricca Tiara Rif'il Husniyah Rigis Sugianti Rika Nanda Rio Anshari Riri Jonuarti rizka fauziah Romizah Marta Rumi Yuliska Silvi Trisna Silvi Yulia Sari Silvira Wahyuni Siti Fauziah Sovia Yulianti Suci Wahyuni Sumi Sahara Suparno Satira Surya Pertiwi Syafri Jamain Syafriani Syafriani Syafrijon Syafrijon Tia Adriany Putri Usmeldi Usmeldi Vanessa Febta Sindani Varadila Sahanaya viola sesri wahyuli Viona Zikra Yerman Wahyumin Kurnia Illahi Wahyuni Satria Dewi Yenni Darvina Yessy Arinda Putri Yohandri Yona Sri Mantia Yonira Mike Vindi Marta Yufrizal Yufrizal Yulis Septianas Sari Yulkifli Yulkifli Yulkifli Yulkifli Zaitul Hidayat Zhafrandy Eka Senida Zulhendri Kamus