Articles
<![CDATA[Removal of Microorganisms in Drinking Water using Pulsed High Voltage ]]>
<![CDATA[Hazmi, Ariadi]]>;
<![CDATA[Desmiarti, Reni]]>;
<![CDATA[Waldi, Eka Putra]]>;
<![CDATA[Darwison, D.]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 45, No 1 (2013) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/j.eng.technol.sci.2013.45.1.1
<![CDATA[A pulsed high voltage was used to remove microorganisms in drinking water. The effects of the pulsed high voltage on pH, conductivity, temperature and oxidation reduction potential (ORP) of the drinking water were investigated. The observed results show that the removal efficiency with respect to fecal coliforms and total coliforms increased with the increase of the pulsed high voltage. The removal efficiency for microorganisms such as fecal coliforms and total coliforms was in the range 25-100% and 44-100%, respectively, after the water was exposed to a pulsed high voltage of 5-10 kV for 60 minutes. An increase of the pulsed high voltage caused a decrease in the conductivity and ORP with operational time.]]>
<![CDATA[Analisis Citra Permukaan Isolasi Listrik Dari Bahan LDPE-NR Akibat Aktifitas Peluahan Sebagian ]]>
<![CDATA[Darwison, Darwison]]>;
<![CDATA[Aulia, Aulia]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 6, No 1: Maret 2017 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v6n1.369.2017
<![CDATA[The correlation between the partial discharge (PD) pulses count and the surface of the related sample was studied and reported in this paper. The assessment was done by testing different samples of the composite low density polyethylene (LDPE) and natural rubber (NR) under a high electric field for 60 minutes. The results showed a strong correlation between the images of the sample surface after testing by the number of PD pulses is counted. The high of PD pulses counted are highly correlated with the larger scale of surface area damaged.Keywords : partial discharge, composite, polyethilene, natural rubber, surface pictureAbstrak— Korelasi antara jumlah pulsa peluahan sebagian (PD) dengan tingkat kerusakan permukaan sampel dikaji dalam makalah ini. Pengkajian dilakukan dengan menguji sampel berbeda dari komposit polietilen berkerapatan rendah (LDPE) dan karet alam (NR) di bawah pengaruh medan listrik tinggi selama 60 menit. Hasil memperlihatkan adanya korelasi yang kuat antara citra permukaan sampel setelah pengujian dengan jumlah pulsa PD yang terhitung. Jumlah pulsa PD yang tinggi berkorelasi dengan luas citra pemukaan sampel rusak yang lebih besar.Kata Kunci : peluahan sebagian, komposit, polietilen, karet alam, citra permukaan]]>
<![CDATA[Kontrol Posisi Robot Mobil Menggunakan Logika Fuzzy dengan Sensor Ultrasonik ]]>
<![CDATA[., Darwison]]>;
<![CDATA[Rusydi, Ilhamdi]]>;
<![CDATA[Fajri, Rico]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 1, No 1: September 2012 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v1n1.63.2012
<![CDATA[Penelitian ini bertujuan membuat kontrol posisi robot mobil dengan menggunakan sensor ultrasonik sebagai pengukur jarak dan encoder untuk penghitung kecepatan robot mobil. Dengan menerapkan metoda logika fuzzy akan membuat pergerakan servomotor DC dari robot mobil bergerak lebih halus. Logika fuzzy merupakan suatu hubungan ketidakpastian sesuatu yang tidak mempunyai suatu batas jelas kedalam suatu persamaan matematis yang mudah dimengerti. Fungsi keanggotaan menggunakan segitiga dan dinyatakan secara numerik serta Metoda inference yang digunakan adalah metode Mandani. Hasil-hasil percobaan menunjukkan bahwa semakin dekat jarak akan membuat pergerakan robot mobil semakin lebih halus. Encoder mempunyai rata-rata persentase kesalahan sebesar 22.38% dan sensor ultrasonic mempunyai rata-rata perubahan waktu per 2 cm yaitu 0.114546 ms dengan kesalahan sebesar 4,14%.        Kata Kunci : robot mobil, logika fuzzy dan kontrol posisi.]]>
<![CDATA[Kontrol Posisi Robot Manipulator Planar Tiga Derajat Kebebasan Berbasis Visual ]]>
<![CDATA[., Darwison]]>;
<![CDATA[Rusydi, M. Ilhamdi]]>;
<![CDATA[., Bentar]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 2, No 1: Maret 2013 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v2n1.93.2013
<![CDATA[Penelitian ini bertujuan membuat kontrol posisi robot manipulator planar berbasis visual dengan menggunakan sensor kamera sebagai pendeteksi keberadaan  objek. Dengan menerapkan metoda Jacobian Citra  akan membuat pergerakan robot lebih cepat sampai ke objek yang terdeteksi. Input dari Jacobian citra didapatkan dari tangkapan piksel benda oleh Kamera. Posisi dicapai dengan pengaturan kecepatan sudut dari hasil Jacobian robot untuk masing-masing joint robot yang menggunakan servomotor. Mikrokontroler digunakan sebagai pengontrol pergerakan dan komunikasi antara kamera dengan komputer melalui modul wireless. Metoda Jacobian citra dan Jacobian robot di proses di Komputer. Hasil percobaan menunjukkan bahwa pergerakan dipengaruhi oleh nilai kedalaman benda terhadap kamera (Z). Dengan nilai Z=1 error piksel terkecil [-1 0] dan waktu pencapaian 6s. Sedangkan untuk Z=10 membuat tingkat akurasinya menjadi berkurang dengan error piksel terkecil [-9 -1] dan waktu pencapaian 8s.Kata Kunci : robot manipulator planar, Jacobian  dan kontrol posisi.]]>
<![CDATA[Kontrol Kecepatan Robot Hexapod Pemadam Api menggunakan Metoda Logika Fuzzy ]]>
<![CDATA[., Darwison]]>;
<![CDATA[Wahyudi, Rian]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 4, No 2: September 2015 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v4n2.170.2015
<![CDATA[This study aims to create a hexapod robot speed control fire extinguisher using fuzzy logic method . By applying the method of fuzzy logic will make the robot move smoother and comparable to the distance . The input of the fuzzy logic method is obtained from three ultrasonic sensors as detection distance to the wall / barrier . Hexapod robot using a servomotor with torgue large enough to perform the movement . Robot speed will be faster if the purpose of the movement of the robot is still far from the wall / barrier and vice versa . Microcontroller with fuzzy logic -based program of its use as a controller movement . The results showed that more refined movement based on the distance read by the sensor , where the sensor is experiencing an error distance measurement is influenced by the material wall / barrier . For the wall material / to obstacle of the board experienced a reading error of 0.18 % , amounting to 0.5 % of books and dolls of 1.58 %.Keywords: hexapod robot, fuzzy logic, and speed controlABSTRAK—Penelitian ini bertujuan membuat kontrol kecepatan robot hexapod pemadam api menggunakan metoda logika fuzzy. Dengan menerapkan metoda logika fuzzy akan membuat pergerakan robot lebih halus dan sebanding dengan jaraknya. Input dari metoda Logika fuzzy didapatkan dari tiga sensor ultrasonik sebagai pendeteksi jarak terhadap dinding/penghalang. Robot hexapod menggunakan servomotor dengan torgue yang cukup besar untuk melakukan pergerakan. Kecepatan robot akan lebih cepat jika tujuan pergerakan robot masih jauh dari dinding/penghalang dan sebaliknya. Mikrokontroler dengan program berbasis fuzzy logic-nya digunakan sebagai pengontrol pergerakan. Hasil percobaan menunjukkan bahwa pergerakan lebih halus berdasarkan jarak yang terbaca oleh sensor, dimana sensor mengalami kesalahan pengukuran jarak yang dipengaruhi oleh bahan dinding/penghalang. Untuk bahan dinding/pengahalang dari papan mengalami kesalahan pembacaan sebesar 0,18%, buku sebesar 0,5% dan boneka sebesar 1,58%.Kata Kunci : robot hexapod, logika fuzzy, dan kontrol kecepatan]]>
<![CDATA[Pembangkit Listrik Pikotermal Matahari, Kajian Awal ]]>
<![CDATA[Aulia, Aulia]]>;
<![CDATA[Darwison, Darwison]]>;
<![CDATA[Razak, Faisyal]]>;
<![CDATA[Waldi, Eka Putra]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 6, No 1: Maret 2017 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v6n1.368.2017
<![CDATA[A Picothermal solar power plant (PLTPM) is an original concept that is still under study. Testing and calculation of voltage and electrical current is carried on a single thermoelectric, thermoelectric cells connected in series and parallel connected thermoelectric cells due to rise in temperature in the cells. The results showed that the increase in temperature of 71 °C produces 1 volt output voltage and current of 0.1 amperes. In accordance with the principle of series and parallel connection, series connection is able to multiply the output voltage and the parallel connections double the current output for one additional thermoelectric cell chipKeywords : Picothermal, thermoelectric cell and series, parallel, temperatureAbstrak— Pembangkit listrik pikotermal matahari (PLTPM) merupakan konsep awal yang masih dalam tahap kajian. Pengujian dan perhitungan tegangan dan arus listrik dilakukan terhadap termoelektrik tunggal, sel termoelektrik terhubung seri dan sel termoeletrik terhubung paralel akibat kenaikan suhu pada sel-sel tersebut. Hasil memperlihatkan bahwa kenaikan suhu sebesar 71 oC menghasilkan tegangan keluaran 1 volt dan arus 0.1 Amper. Sesuai dengan kaedah hubungan seri dan paralel, hubungan seri mampu melipat gandakan tegangan keluaran dan hubungan paralel melipatkan gandakan arus keluaran untuk tambahan setiap satu keping sel termoelektrik.Kata Kunci : pikotermal, sel termoelektrik, seri, paralel, kenaikan suhu]]>
<![CDATA[Prediction of ZnO Surge Arrester Degradation Based on Temperature and Leakage Current Properties ]]>
<![CDATA[Novizon, Novizon]]>;
<![CDATA[Abdul-Malek, Zulkarnain]]>;
<![CDATA[Aulia, Aulia]]>;
<![CDATA[Waldi, Eka Putra]]>;
<![CDATA[Rajab, Abdul]]>;
<![CDATA[Darwison, Darwison]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 7, No 2: July 2018 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v7n2.501.2018
<![CDATA[Temperature and leakage current on the ZnO arrester are interrelated with each other. In low conduction region, voltage-current characteristics of ZnO surge arrester are highly dependent on temperature. The leakage current will increase as the temperature increases and experience thermal runaway when the temperature exceeds the acceptable limit. This phenomenon is associated with the increase of resistive leakage current due to degradation. Therefore the temperature and leakage current are good indicator to evaluate the condition of ZnO arrester. This paper proposed the degradation prediction of ZnO surge arrester by analyzed the temperature and leakage current. The 132 kV station type ZnO surge arrester was employed. Temperature profile of ZnO arrester was obtained using thermal camera. The leakage current was measured simultaneous with the temperature measurement to attain the leakage current at the actual temperature. The results shows the leakage current continue increasing by increasing the temperature. Keywords : Resistive leakage current, temperature, degradation, prediction, zinc oxide surge arrester]]>
<![CDATA[The effect of silica content to partial discharge characteristic of low-density polyethene and natural rubber blend as the electrical insulator ]]>
<![CDATA[Aulia Aulia]]>;
<![CDATA[Eka Putra Waldi]]>;
<![CDATA[Darwison Darwison]]>;
<![CDATA[Dwi Gustiono]]>;
<![CDATA[Novizon Novizon]]>;
<![CDATA[M. Heru Setiawan]]>;
<![CDATA[M. A. Hafizi]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 2: April 2021 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v19i2.16417
<![CDATA[The dielectric properties of low-density polyethylene natural rubber (LDPE-NR) biopolymeric insulating materials can be improved by adding the silica nanoparticles in a certain percentage of weight (w%). In the present study, four types of bio-nano polymeric samples were prepared. To each sample, the nanosilica particles with wt% 1.5%, 3%, 4.5% and 6%. As one characteristic of dielectric, the partial discharge (PD) characteristics, each sample has been tested for 1 hour under AC high voltage field, and the pulses were counted for each sample and grouped into positive and negative pulses. The PD pattern was also plotted based on X-Y axes, namely Φ-q-n pattern. It was found that the number of positive and negative partial discharge (PD) pulses for each silica sample after 60 minutes of testing varied for all samples. It is also found that samples with a higher percentage of nanosilica had fewer PD pulses. The PD pattern in lower w% of silica was identified in the 90 degrees mostly in containing This indicates that w% of nanosilica particles can improve the PD resistance or the insulation quality of LDPE-NR insulation materials.]]>
<![CDATA[Removal of Microorganisms in Drinking Water using Pulsed High Voltage ]]>
<![CDATA[Ariadi Hazmi]]>;
<![CDATA[Reni Desmiarti]]>;
<![CDATA[Eka Putra Waldi]]>;
<![CDATA[D. Darwison]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 45 No. 1 (2013) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/j.eng.technol.sci.2013.45.1.1
<![CDATA[A pulsed high voltage was used to remove microorganisms in drinking water. The effects of the pulsed high voltage on pH, conductivity, temperature and oxidation reduction potential (ORP) of the drinking water were investigated. The observed results show that the removal efficiency with respect to fecal coliforms and total coliforms increased with the increase of the pulsed high voltage. The removal efficiency for microorganisms such as fecal coliforms and total coliforms was in the range 25-100% and 44-100%, respectively, after the water was exposed to a pulsed high voltage of 5-10 kV for 60 minutes. An increase of the pulsed high voltage caused a decrease in the conductivity and ORP with operational time.]]>
<![CDATA[Kontrol Posisi Robot Mobil Menggunakan Logika Fuzzy dengan Sensor Ultrasonik ]]>
<![CDATA[Darwison .]]>;
<![CDATA[Ilhamdi Rusydi]]>;
<![CDATA[Rico Fajri]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 1 No 1: September 2012 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v1n1.63.2012
<![CDATA[Penelitian ini bertujuan membuat kontrol posisi robot mobil dengan menggunakan sensor ultrasonik sebagai pengukur jarak dan encoder untuk penghitung kecepatan robot mobil. Dengan menerapkan metoda logika fuzzy akan membuat pergerakan servomotor DC dari robot mobil bergerak lebih halus. Logika fuzzy merupakan suatu hubungan ketidakpastian sesuatu yang tidak mempunyai suatu batas jelas kedalam suatu persamaan matematis yang mudah dimengerti. Fungsi keanggotaan menggunakan segitiga dan dinyatakan secara numerik serta Metoda inference yang digunakan adalah metode Mandani. Hasil-hasil percobaan menunjukkan bahwa semakin dekat jarak akan membuat pergerakan robot mobil semakin lebih halus. Encoder mempunyai rata-rata persentase kesalahan sebesar 22.38% dan sensor ultrasonic mempunyai rata-rata perubahan waktu per 2 cm yaitu 0.114546 ms dengan kesalahan sebesar 4,14%. Kata Kunci : robot mobil, logika fuzzy dan kontrol posisi.]]>
