9 research outputs found


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    Penelitian ini berfokus pada bagaimana merancang dan membangun sebuah sistem informasi yang berbasis capaian atau Outcome Based Education (OBE) dengan menggunakan framework PHP Codeigniter. Permasalahan yang akan diselesaikan dalam penelitian ini yaitu membantu dosen dalam menghitung capaian matakuliah kedalam pembobotan penilaian dan menyajikan hasil akhir capaian masing-masing mahasiswa, dimana tujuan utama pada penelitian ini yaitu menyediakan sistem yang mampu memudahkan dosen dalam merumuskan prosentase capaian matakuliah, mendetailkan hasil capaian masing-masing mahasiswa dan sistem yang mampu menghasilkan informasi dalam rangka membantu dosen dalam menyimpulkan capaian seluruh peserta kelasnya. Aktifitas utama pada sistem ini diawali dengan memasukan capaian matakuliah, lalu menentukan besaran prosentase dalam pemobobotan nilai terhadap masing-masing capaian matakuliah, selanjutnya aktifitas penilaian mahasiswa, dan yang terakhir adalah penyajian informasi capaian oleh sistem sebagai luarannya. Hasil pada penelitian ini berupa prototipe sistem informasi berbasis capaian yang mampu memudahkan dosen dalam merencanakan hasil pembelajaran, memasukan penilaian dan melihat laporan capaian matakuliah seluruh peserta kelasnya

    Deposition of Carbon Thin Film by Means of a LowFrequency Plasma Sputtering Using Battery Carbon Rods as a Target

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    Carbon rods of battery were utilized as a target in a plasma sputtering deposition of a carbon thin film. The rods were taken from unused battery waste containing some impurities. This study was intended to investigate the effect of the impurities on the resulted thin film. Furthermore, this work aimed to study the utilization of an unconventional sputtering technique to deposit the carbon film on glass substrates. A low-frequency plasma generator of 40 kHz was used to power the sputtering reactor. The plasma was generated from an Argon gas in a medium vacuum pressure. Two deposition parameters studied in this work were plasma power varied from 220 watts to 360 watts and substrate temperature varied from 25 o C to 202 o C. The carbon target in this research was also functioned as an electrode in the sputtering system. The deposition process was carried out for 1 hour to produce a reasonably thick carbon thin film. The resulted films were characterized using a Fourier Transform Infrared (FTIR) spectroscopy. The FTIR spectra showed a distinct peak around 1200 cm -1 and 1600-1700cm -1 related to the C-C and C=C vibration respectively. The relatively broad peak consisted of a doublet indicating a complex structure of the carbon film, presumably an amorphous carbon film. It was proven that impure carbon could be used as the target and successfully deposited on the glass substrate

    Nonlinearity compensation of low-frequency loudspeaker response using internal model controller

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    This paper presents the nonlinearity compensation of low-frequency loudspeaker response. The loudspeaker is dedicated to measuring the response of Electret Condenser Microphone which operated in the arterial pulse region. The nonlinearity of loudspeaker has several problems which cause the nonlinearity behaviour consists of the back electromagnetic field, spring, mass of cone and inductance. Nonlinearity compensation is done using the Internal Model Controller with voltage feedback linearization. Several signal tests consist of step, impulse and sine wave signal are examined on different frequencies to validate the effectiveness of the design. The result showed that the Internal Mode Controller can achieve the high-speed response with a small error value

    Pengaruh Tekanan Chamber Dan Laju Alir Gas Pada Proses Modifikasi Permukaan Polistiren Menggunakan Metode Plasma Rf Dengan Dc Bias

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    Telah dilakukan perlakuan plasma nitrogen menggunakan metode plasma RF dengan DC bias di atas permukaan polistiren dengan variasi tekanan chamber dan laju alir gas. Tujuan dari penelitian ini untuk menganalisis pengaruh tekanan dan laju alir terhadap karakter plasma dan sifat hidrofobisitas permukaan polistiren di atas quart crystal microbalance (QCM) sensor. Pelarut toluena digunakan untuk melarutkan polistiren dan larutan polistiren dideposisikan di atas permukaan QCM dengan teknik spin coating. Perlakuan plasma nitrogen dilakukan dengan variasi tekanan chamber 40, 50, 60, 70, dan 80 Pa dengan parameter konstan laju alir 60 ml/menit, tegangan RF 90 volt dan DC bias 400 volt. Sedangkan variasi laju alir 20, 30, 40, 50, 60, dan 70 ml/menit dengan parameter konstan laju alir 60 ml/menit, tegangan RF 90 volt dan DC bias 400 volt. Spesies plasma diukur dengan optical emission spectroscopy (OES) Aurora 400 berupa panjang gelombang dan intensitas

    Perancangan Telemetri Aktivitas Gunung Berapi Menggunakan Sensor Seismik 3C Dengan Gelombang Wifi 2.4GHz

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    Remote monitoring using high-frequency Wifi telemetry communications media is a solution that enables to benefits from data transfer speed, remote communication, data security system and uses less energy. This study aims to establish a telemetry communication system of integrated sensor networks for the volcanic geographic area with some advantages such as the physical parameters of a volcano conditions accurately in real-time and online, the higher transmission speed, easily duplicated, and the flexibility for additional high sensors as a part of the decision making to determine the volcano status. Wifi telemetry 2.4GHz offers a high data transfer speed, the current supported equipment or modules have been reached a speed of 100Mbps. Range coverage’s performed on this test reached a maximum distance of 2 km line of sight, the data in the form of sensor data and moving images. The visual data expected is not in fully real-time, because there are 5 seconds delays from the production time. To use a shorter delay in order to the image goes faster, the main processor of raspberry experienced some over heat, and then it is not suitable for a long-term continuous use. Keywords : Access Point, Raspberry Pi, Seismic Sensor, Telemetry, Wif


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    One pot in-situ co-precipitation of chitosan-Fe3O4 nanoparticles as a candidate of drug delivery agent have been synthesized using combination of tripolyphosphate (TPP)/citrate as cross-linkers. The aim of this study was to determine the effect of preparation process towards chitosan-Fe3O4 nanoparticles characteristics. Chitosan-Fe3O4 nanoparticles were prepared on various preparation condition including Chitosan:Fe(II):Fe(III) ratio, TPP:citrate ratio, and cross-linking time. The X-ray diffraction result shows that the phase contained in nanoparticles produced is mostly Fe3O4 phase, since the diffraction peaks of the samples were consistent with the database in crystalline pattern of the Fe3O4 phase in ICSD#26410. The percentage of Fe3O4 was obtained from Materials Analysis Using Diffraction (MAUD) program. The presence of chitosan prevents the oxidation of Fe3O4, as evidenced by larger percentage of Fe3O4 in chitosan-Fe3O4 nanoparticles than bare Fe3O4. The combination of TPP:citrate as cross-linking agent was able to produce particles with spherical shape. Cross-linking time affect the particle size, crystallite size, and percentage of Fe3O4 nanoparticles. Longer duration of cross-linking process would produce the smaller particle size and crystallite size. Meanwhile, the percentage of Fe3O4 decreased with the increasing cross-linking time, due to the oxidation of samples in contact with the oxygen dissolved in the water