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Lazuardi Umar
Universitas Riau
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Journal : Komunikasi Fisika Indonesia

 1 
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

Abstract

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.
IDENTIFIKASI HEWAN BERDASARKAN POLA AKUSTIK DENGAN PRINSIP EKSTRAKSI WAVELET DAN KLASIFIKASI MULTI-LABEL JARINGAN SYARAF TIRUAN Defrianto Defrianto; Titrawani Titrawani; Lazuardi Umar; Vepy Asyana
Komunikasi Fisika Indonesia Vol 19, No 1 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.1.51-56

Abstract

An acoustic identification and classification system of frogs has been designed based on the principle of wavelet extraction and label classification using an artificial neural network (ANN). This system consists of electronic detection for frog audio as well as an interface using the MATLAB 2018b software as an ANN provider device. As input for the neural network, 5 types of frogs were used, namely the rock frog (Limnonectes macrodon), the blentung frog (Kaloula baleata), the hip frog (Limnonectesblythii), the rice field frog (Fejervarya cancrivora), and the trench frog. frog. frog (Fejervarya limnocharis). ), each with 12 sound samples. Before being inserted into the neural network, 3 levels of sound samples were extracted and denoised using wavelet symlet 3. Furthermore, in the neural network training process, 3 validation samples and 3 test samples were used. After training, the artificial neural network was able to identify the type of frog being tested.
PENGARUH HAMBATAN INTERNAL TERHADAP DAYA OUTPUT ELEMEN TERMOELEKTRIK GENERATOR TIPE 10W-4V-40s Eri Wiyadi; Lazuardi Umar
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (92.796 KB) | DOI: 10.31258/jkfi.15.1.67-70

Abstract

Thermoelectric generator Type 10W-4V-40s powered by Seebeck effect by utilizing temperature difference in both sides of the element. The hot side (Th) of a TEG element is placed on a stand made of Aluminum-Dural material and given a heat source derived from a heater, on the cold side (Tc) TEG element installed heatsink to reduce heat energy through the cold side and keep the temperature low. The measurement of output power (PL) is done by variation of RL from 0 Ω to 20 Ω under temperature difference conditions (ΔT) varies with constant Tc at 30ºC, the result of the research indicates that the output power (PL) of the thermoelectric element is maximum at RL = 1 Ω when the minimum load decreases and is proportional to the increase in RL resistance. The internal resistance value (Rint) of the TEG element increases in proportion to the magnitude of ΔT on both sides of the element, on Tc and Th at room temperature (30ºC) the value of Rint is 0.85 Ω and the maximum value at ΔT = 50ºC is 1,043 Ω. This indicates that the TEG element depends not only on ΔT on both sides of the module, but also depends on the amount of temperature range used.
PENGUKURAN NILAI INDUKTANSI PELAT ALUMINIUM BERDASARKAN VARIASI KAPASITANSI MENGGUNAKAN MODUL EVB LDC 1000 Cinryani Cinryani; Lazuardi Umar; Salomo Salomo; Maksi Ginting
Komunikasi Fisika Indonesia Vol 17, No 1 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (362.464 KB) | DOI: 10.31258/jkfi.17.1.24-29

Abstract

The method that has been done in metal thickness measurement is a plate thickness measurement method using an eddy current based sensor. Eddy current sensors can measure the thickness of non-magnetic metal layers through an inductance relationship with variations in thickness where the thickness used for Cu is 0.4 mm, 0.9 mm, 1.5 mm, 2 mm, 4 mm, while Al is used ie 0.4 mm, 0.5 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 4 mm, 5 mm with a single frequency of 1 Hz with a capacitance value of C0 5 pF. The inductance vs. thickness curve for aluminum and copper has an exponential relationship. The distance between the sensor and non-magnetic material is kept constant at 2 mm. Variations in the value of capacitance C0 used in the measurements are then varied to 100 pF, 200 pF, and 300 pF to see the effect of inductance on the thickness of the plate as a function of the capacitor (C) oscillation.
Co-Authors Cinryani Cinryani Defrianto Defrianto Dina Maryani Eri Wiyadi Maksi Ginting Salomo Salomo Titrawani Titrawani Usman Malik Vepy Asyana Yanuar Hamzah