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All Journal Jurnal Keteknikan Pertanian Komunikasi Fisika Indonesia TELKOMNIKA (Telecommunication Computing Electronics and Control) Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Pendidikan Ekonomi Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Journal of Aceh Physics Society JOURNAL ONLINE OF PHYSICS Jurnal Fisika FLUX Unri Conference Series: Community Engagement JRAP (Jurnal Riset Akuntansi dan Perpajakan) Science, Technology, and Communication Journal

Defrianto Defrianto

Unknown Affiliation

Author-ID : 251115

Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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PENGARUH KEBIASAAN BELAJAR DAN PERHATIAN ORANG TUA TERHADAP HASIL BELAJAR SISWA EKONOMI KELAS X DI SMA KARTIKA 1 â 5 PADANG. Defrianto, Defrianto; Afriza, Rina; Eprillison, Vivina
Pendidikan Ekonomi Vol 1, No 1 (2014): Jurnal Wisuda Ke 48 Mahasiswa Prodi Pendidikan Ekonomi
Publisher : Pendidikan Ekonomi

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

ABSTRACTÂ Â This research was conducted at the Padang 1-5 Kartika High School Study Habits Influence And Attention Parents Against Student Results X Class Economy In high school Kartika 1-5 Padang . The purpose of this study is to obtain empirical evidence about the Influence of Study Habits And Attention Parents Against Student Results X Class Economy In high school Kartika 1-5 Padang . The method used in this research is descriptive and associative . This research is a symptom , events and to determine the relationship between two variables or more , where the population sampled were used as much as 174 students out of a population of 308 students . Data habit learning ( X1 ) and parental concern ( X2 ) is obtained from the results of the questionnaire or questionnaires while economics student learning outcomes data ( Y ) is obtained from the documentation of the value of mid semester. Analysis of the data used in this study is a descriptive analysis and inductive analysis which consists of a normality test, multikolinielitas , heterosidasitas test , autocorrelation test , multiple regression analysis , determination ( R2 ) and test the hypothesis . The results of this study indicate that : 1 . Habit learning positive and significant effect on student learning outcomes economy class X SMA kartika 1-5 field , 2 . Attention parents and significant positive effect on learning outcomes of students high school economics class X kartika 1-5 padang , 3 . habit learning and parental concern and a significant positive effect jointly to the results of the economic study of high school students kartika 1-5 padang . Based on these results , it is suggested that students , parents , teachers and school authorities to pay more attention to another study habits and attention of parents in the learning process in an effort to further optimize student learning outcomes economy class X SMA kartika 1-5 padang.

PENINGKATAN SENSITIVITAS SENSOR KOIL DATAR MEMPERGUNAKAN SOFT MAGNETIC VITROVAC Tengku Emrinaldi; Defrianto; Sultan Fiddunya Fiddunya; Rahmondia N. Setiadi; Lazuardi Umar
JOURNAL ONLINE OF PHYSICS Vol. 5 No. 1 (2019): JOP (Journal Online of Physics) Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.7986

This study reports the design of non-magnetic plate thickness sensors based on Eddy Current principld in the form of flat coils. The principle used in the Eddy Current sensor is a change of mutual coil inductance due to the presence of objects in the magnetic field. The coil is made up of single and double layer coil designed using Corel Draw Software based on printed circuit board (PCB) material with dimensions of 152.4 mm x 101.6 mm, which has a track distance of 0.125 m. Single and double layer coil inductance evaluations are carried out using the EVB LDC 1000 L/V Converter module which converts plate thickness into inductance values. The addition of a 30 mm Vitrovac thin film mounted in the direction of the winding in the 2 mm diameter coil core has been carried out to increase the sensitivity value of the sensor which gives an increase in sensitivity value of S = 0.321 uH / mm or 33.2%. The coil is able to measure plate thickness up to 10mm well.

Simplified Linear Configuration Model of 3X3 Single Mode Fiber Coupler using Matrix Transfer Saktioto Saktioto; Dedi Irawan; Defrianto Defrianto
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 3: September 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v13i3.2094

Experimental design and operation of a directional fiber coupler having identical-output ratio is successfully fabricated. The coupling region is imposed by fusion temperature 800-1350 0C injecting the Hydrogen gas at 1Atm. Concurrently the coupled-mode theory is used to model power transfer between the waveguides by using transfer matrix method. By 1mW source input power to one of three input ports, it shows that power propagation among three coupled fibers is normalized; the optical fiber are nearly identical and a similar separation between them. The matrix configuration of 3X3 is also used to calculate the polarization effect of directional fiber coupler. It is found that the incident power polarized with various angle causes power output at both three output ports decrease exponentially. This 3X3 directional fiber coupler design is a significant passive component for various functions power splitter and routers.

Topological Gravity of Chern-Simons-Antoniadis-Savvidy in 2+1 Dimensions Suhaivi Hamdan; Defrianto Defrianto; Erwin Erwin; Saktioto Saktioto
Journal of Aceh Physics Society Volume 9, Number 3, September 2020
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v9i3.16635

Pada artikel ini akan ditunjukan analisa dari perluasan gauge invariant exact dan metric independent untuk menkontruksi lower-rank field-strength tensor. Hasil ini akan digunakan untuk mengkontruski ulang Chern-Simons-Antoniadis-Savvidy formasi (2n+1) pada dimensi genap dengan menggunakan pendekatan diferensial geometri. Selanjutnya akan dianalisa bentuk topological gravitasi 2-dimensi yang merupakan perluasan dari teorema Chern-Weil yang telah dikembangkan oleh Izurieta-Munoz-Salgado. Hasil dari penelitian ini memperlihatkan bahwa aksi Lagrangian yang sama seperti pada topological gravitasi Chern-Simons forms pada dimensi (2n+1) invariant terhadap Poincare group SO(D−1,1) SO(D−1,2). This article determine and analyess of the extended gauge invariant exact and metric independent to construct the lower-rank field-strength tensor. These results used to construct Chern-Simons-Antoniadis-Savvidy (2n+1)-forms even dimensions using a differential geometry approach. This result analyzed 2-dimensional topological gravity forms that extended Chern-Weil theorem which has been developed by Izurieta-Munoz-Salgado. These results show similary topological gravity Lagrangian action of Chern-Simons forms (2n+1)-dimension invariant under Poincare group SO(D−1,1) SO(D−1,2).Keywords: Gauge theory, field-strength tensor, Chern-Weill theorem, Chern-Simons-Antoniadis-Savvidy forms, topological gravity

PENGEMBANGAN ENERGI TERBARUKAN HYBRID THERMOELECTRICS DENGAN MEMANFAATKAN PANAS MATAHARI DARI KOLEKTOR PARABOLA SILINDRIS Defrianto Defrianto; Eri Wiyadi; Lazuardi Umar
Komunikasi Fisika Indonesia Vol 18, No 3 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.3.167-172

Pembangkit energi listrik Thermoelectric Generator tipe 10W-4V-40s bekerja melalui perbedaan suhu dikedua sisinya. Sisi panas (Th) dari sebuah elemen TEG diletakan pada dudukan yang terbuat dari bahan Alumunium Dural dan diberi sumber panas yang berasal dari kolektor surya parabola, pada sisi dingin (Tc) elemen TEG dipasang heatsink guna mengurangi energi panas yang menembus sisi dingin serta menjaga suhunya agar tetap rendah, hasil dari penelitian menunjukan bahwa Kolektor surya parabola dalam penelitian ini mampu menghasilkan suhu maksimum sebesar 64,2 °C. Tegangan Voc maksimum yang dihasilkan dari penelitian adalah sebesar 1,087 V selain itu tegangan beban Vo terhadap variasi hambatan beban RL pada suhu Th 40 °C dan suhu sisi dingin Tc 32 °C adalah 459, 47 mV pada RL 20 Ω., arus beban maksimum yang diperoleh adalah 125,97 mA pada RL 0,5 Ω dan cendrung turun seiring bertambahnya RL yaitu sebesar 23,63 mA pada RL 20 Ω. Nilai tegangan VL dan IL paling besar terletak pada saat receiver berada pada ketinggian 17,5 cm atau tepat berada pada titik fokus reflektor, yaitu sebesar 120,90 mV dan 31,87 mA dengan ∆T sebesar 25 °C.

PERHITUNGAN PARAMETER KISI KRISTAL BERSTRUKTUR HEXAGONAL BERDASARKAN POLA DIFRAKSI ELEKTRON DENGAN DENGAN BANTUAN KOMPUTER Erwin '; Salomo '; Defrianto '; Mbantun Ginting; M. Rasyid Ridho
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Pola difraksi electron yang diperoleh melalui mikroskop electron untuk kristal berstruktur hexagonal seperti lapisan tipis cobalt sulit untuk dilakukan secara manual. Oleh karena itu, perlu dilakukan perhitungan terhadap parameter kisi cobalt dengan menggunakan komputer. Dalam penelitian ini, telah dibuat dua buah program komputer yang ditulis dengan menggunakan Matrix Laboratory (Matlab) versi R2008b. Program pertama disebut program menu yang digunakan untuk menulis data yang diperlukan dalam perhitungan. Program kedua disebut program utama yang dibuat untuk melakukan perhitungan terhadap parameter kisi a dan c dengan memanfaatkan data pada program menu. Data yang digunakan dalam penelitian ini adalah pola difraksi elektron cobalt dalam bentuk lapisan tipis dari transmission electron microscope (TEM). Jari–jari dari masing masing cincin pola difraksi cobalt diukur dengan menggunakan jangka sorong. Nilai ini diinputkan kedalam program menu. Program utama akan menghitung nilai dari jarak antar bidang ሺ ????????ℎ???????????????? ) dlam kristal. Langkah berikutnya, program utama akan melakukan perhitungan terhadap nilai-nilai parameter kisi untuk semua kemungkinan bidang dari sistem kristal heksagonal dengan memanfaatkan subroutine bisection. Pada langkah akhir, program utama akan memilih untuk semua kemungkinan bidang bidang kristal dari sistem kristal heksagonal untuk mana nilai parameter kisi a dan c yang hampir sama. Hasil penelitian menunjukkan bahwa perhitungan parameter kisi a dan c untuk h k l berbeda adalah a=2.4998 Å dan c=4.0545 Å.

STUDI AWAL GRADING BUAH SAWIT DENGAN BANTUAN INJEKSI TEGANGAN LISTRIK SEARAH Andri Saputra; Wahyu Candra; Yan Soerbakti; Romi Fadli Syahputra; Defrianto Defrianto; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 16, No 2 (2019)
Publisher : Universitas Riau

Maturity progress of palm fruit is greatly depending on the availability of nutrients and environments. Determining maturity level of palm fruit is important to evaluate the quality of palm oil fruits. The younger or too mature fruits will produce poor quality of crude palm oil (CPO). An appropriate devices are needed that can measure the level of fruit maturity so that uniformity of maturity grade can be carried out to obtain high quality CPO. This research provides a preliminary study of voltage change on the surface of oil palm seeds which subjected by electric potential. The low directional voltage (DC) injection treatment, ~ 10V, was applied to investigate the impact of applied voltage on palm oil seeds with three different levels of maturity, i.e. immature (young), ripe and over ripe . The results shown that oil palm fruit quite quickly responds to injection of DC applied voltage with different responding voltage. This responding voltage tends to increase with increasing maturity levels, but decreases for over ripe fruit which has falling down and starting to dry out.

SIMULASI POLA ALIRAN FLUIDA DALAM DAERAH DENGAN BATAS TIDAK TERATUR MENGGUNAKAN METODE ELEMEN HINGGA Defrianto Defrianto; Dwi Putri Cahya Safitri
Komunikasi Fisika Indonesia Vol 16, No 1 (2019)
Publisher : Universitas Riau

Research of ideal fluid flow on irregular domain by variation mesh has been done. Laplace equation was used to model velocity potential and the gradient was used to velocity. Boundary condition for inlet was chosen to be 15 , while for outlet was 30 and Neumann boundary condition on lateral side. The developed model shows that uniform flow was happened on straight channel and free vortex on the curved one. The analytical and computational calculation has similar results, that is 23.7787 and 23.7792 The percentage of the difference is 2.8 wich is very small, therefore this method is accurate enough to model pattern of ideal fluid flow on irregular domain.

PREDIKSI CURAH HUJAN DAN KELEMBABAN UDARA KOTA PEKANBARU MENGGUNAKAN METODE MONTE CARLO Melani Seprima; Defrianto Defrianto
Komunikasi Fisika Indonesia Vol 17, No 3 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.3.134-138

Weather prediction is important in our lives and can minimize the impact that will occur in the future. Rainfaal and humidity greatly affect the weather conditions in Indonesia. Accuracy in the prediction of rainfall and humidity is very important because it can be used in various interests. The data used are the monthly average data of rainfall and humidity in the city of Pekanbaru in 2014–2018 obtained from BMKG Pekanbaru, then the monthly average data will be processed using a MATLAB R2015a based program so that an average rainfall prediction simulation is obtained and air humidity in 2019–2023. MATLAB R2015a based program using the monte carlo method and has error value 0.0887913.

Pengaruh Ketidakteraturan Domain pada Normal Mode dan Frekwensi Natural Pada Getaran Membran Defrianto Defrianto; Walfred Tambunan; Maksi Ginting
Komunikasi Fisika Indonesia Vol 14, No 1 (2017)
Publisher : Universitas Riau

Telah dilakukan penelitian untuk menentukan frakwensi natural dan normal mode getaran membrane dengan luas 48 m2 berbentuk teratur 4 sisi, tidak teratur 8 dan 10 sisi. Frekwensi fundamental pada normal mode pertama untuk membrane 4, 8 dan 10 sisi berturut-turut yaitu 1.7129, 1.7503 dan 1.7973 Hz. Frekwensi natural untuk mode yang sama menunjukkan semakin tidak teratur membrane akan memberikan frekwensi natural yang semakin tinggi. Normal mode untuk setiap mode pada membrane 4, 8 dan 10 sisi memberikan bentuk yang hampir sama.

Co-Authors Abdullah, Hewa Yaseen Ade Saputra Agrina, Agrina Ahlunnazah, Muhammad Andika Thoibah Andika Thoibah Andri Saputra Anita, Sofia Asyana, Vepy Awitdrus Awitdrus, Awitdrus Azura ' Debora M Sinaga dedi irawan Dedi Irawan Dedi Irawan Dewi Indriyani Roslim Dino Yanuardi Dwi Putri Cahya Safitri Eri Wiyadi Erwin ' Erwin Amiruddin Erwin Erwin Erwin, ' Fadhali, Mohammed Fadhali, Mohammed M Haryana Hairi Juandi Juandi Kisna Pertiwi Krisman ' Lazuardi Lazuardi Lazuardi Umar Lifa Anggar Mayasari Lihayardi, Lihayardi Lubis, Nuraina Fika M. Rasyid Ridho Maksi Ginting Mbantun Ginting Meiliyah Ariani, Meiliyah Melani Seprima Minarni Shiddiq, Minarni Moh Danil Hendry Gamal Mutiara Akhdesia Nuraina Fika Lubis Okfalisa Okfalisa Pratama, Nando Putri, Ika Aprilla Rabin, Mohammed Fisal Rahman Kurniawan Rahmi Dewi Rahmondia N. Setiadi Ramadhani, Fatima Nur Reynal Nur Razzaq Riad Syech Riad Syech Rina Afriza Rina Amelia Rini, Ari Sulistyo Rini, Ari Sulistyo Risanto, Joko Riska Amalia Rofeah ' Romi Fadli Syahputra Saktioto Saktioto Saktioto, Saktioto Salomo ' Salomo Salomo Sandra Septiana Septi Pramuliawati Soerbakti, Yan Soerbakti, Yan Sofia Anita Suhaivi Hamdan Suhardi Suhardi Suhardi Suhardi Sultan Fiddunya Fiddunya Syahril Syahril Syamsudhuha Syamsudhuha Tengku Emrinaldi Titrawani Titrawani Usman Malik Usman Usman Vepy Asyana Vira Marselly Vivina Eprillison Wahyu Candra Walfred Tambunan Wildan Adli Wima Puspita Wirianto, Hazmi Yan Soerbakti Yan Soerbakti Yohanes Dwi Saputra, Yohanes Dwi Yupapin, Preecha Zahroh, Siti Zamri, Zamri Zulfa Zulfa Zulhawati Zulkarnain Zulkarnain

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