Browsing by Author "Ginting, Mbantun"

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    ANALISIS SPEKTRUM SUARA MANUSIA BERDASARKAN SUKU PADA KELOMPOK USIA ANAK-ANAK DENGAN MENGGUNAKAN SOFTWARE PRAAT
    (2016-02-01) Gaol, Normaida Lumban; Erwin; Ginting, Mbantun
    A study on the human voice spectrum is analyzed based on ethnic and age groups of children 8-11 years old. Recording is done with the human voice by using a microphone and a computer equipped with a software praat instead of the spectrum analyzer. The recorded sound spectrum determined a fundamental frequency (pitch) and formant. Sampling was done by recording the sound from each tribe of Batak, Malay, Minang, and Java, which consists of 4 males and 4 females were grouped into children aged 8-11 years. Each voice read three pieces word is "Red and White", "Indonesia" and "Youth Pledge". The results showed that the tribe (ethnic) Batak in males has a value of fundamental frequency averages higher at 231-282 Hz than the Malay, Minang, and Java has a fundamental frequency value of the average 241-252 Hz, 150-214 Hz, and 134 Hz-170 Hz. The value of the average fundamental frequency of each tribe for females, in which the value of highest frequency contained in Malay is 225-235 Hz compared to ethnic Minang, Javanese and Batak which has an average fundamental frequency are 186-240 Hz, 148-186 Hz and 125-186 Hz. The differences in the fundamental frequency caused by factors based on gender, age, condition of a person, the tribe and the condition of the room. The formant value rose from the first formant (F1) to the third formant (F3). Average formant values F1, F2, and F3 males lower compared to females. Formant value of the average F1, F2 and F3 boys 2116.387 Hz, 2157.046 Hz and females
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    FABRIKASI DAN KARAKTERISASI MEMBRAN SEL BAHAN BAKAR DENGAN STRUKTUR SUPRAMOLEKULAR
    (2016-02-01) Sardiman; Ginting, Mbantun; Hendrana, Sunit
    The production of fuel cell membranes based on sulfonated polystyrene (sPS) with recurrent smoothly method has been conducted. The membrane-based polistren sulfonated matrix is made of a mixture of 0.5 grams sPSBM, 0.5 PE-g-MAH and 1 gram PSBM, the mixture is compacted by using hotpress with temperatures of 1050 C at a pressure of 20 kgf / cm2. Matrix is dropped with supramolecular solution while heated at a temperature of 800 C and contolled for not being cracked. The membrane that has been spilled solution of supramoleculer is smoothed again. The purpose of refining the material to the membrane is to spread more evenly so as to increase the conductivity of the membrane, and the membrane process of refining and compaction is done repeatedly. At the final stage, the membrane that has been compacted is then thinned by using a press machine, so that the membrane is thinner. The membrane is observed with an optical microscope to observe at the distribution of the material. The test group of membrane function uses Fourier-Transform Infra Red (FTIR). Testing the structure morphology and distribution of material on the membrane uses a Scanning Electron Microscope (SEM). Testing membranes ionic conductivity uses Electrohemical impedance spectroscope (EIS). The result showed that the distribution of membrane material has been uneven, but in SEM it still observes evenly spread the material. In FTIR, it looks the energy absorption at wave numbers between 2800-3100 cm-1 in the form of bonding hydroxyl (OH) derived from sPS and PE-g-MAH of supramolecular solution. Membrane ionic conductivity values are calculated by using the for 9:51 x 10-5 S/m. In the manufacture of membranes for fuel cells spread by of materials is essential in improving the conductivity. By refining and compaction system repeatedly will facilitate to make a membrane a uniform material distribution that will enhance the value of the conductivity of the membrane.
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    Karakterisasi Dan Efisiensi Sel Surya Yang Terhubung Seri Dan Paralel
    (2015-07-07) Ginting, Mbantun; Umar, Lazuardi; Takalamingan, Fredynandus
    Telah dilakukan karakterisasi sel surya menggunakan sumber cahaya alam yaitu matahari dan menggunakan lampu halogen sebagai sumber cahaya buatan yang dirangkai tunggal, seri dan paralel. Dengan menggunakan sumber cahaya matahari, pada sel surya yang dirangkai tunggal diperoleh nilai tegangan maksimum 518 mV dan arus maksimum 205 mA. Sedangkan untuk sel surya yang dirangkai seri diperoleh nilai tegangan maksimum pada 1022 mV dan arus maksimum 191,5 mA. Pada sel surya yang dirangkai paralel diperoleh tegangan maksimum 513 mV dan arus keluaran maksimum sebesar 478,2 mA. Untuk sel surya yang menggunakan lampu halogen diperoleh nilai tegangan maksimum 510 mV dan arus maksimum 41s mA. Sedangkan untuk sel surya yang dirangkai seri diperoleh nilai tegangan maksimum pada 910 mV dan arus maksimum 518 mA. Pada sel surya yang dirangkai paralel diperoleh tegangan maksimum 840 mV dan arus keluaran maksimum sebesar 858 mA. Untuk nilai daya dan efisiensi pada sel surya yang menggunakan sumber cahaya matahari pada rangkaian tunggal diperoleh daya maksimum sebesar 104,3 mW dan efisiensi maksimum sebesar 5,3%. Sedangkan pada sel surya yang dirangkai seri diperoleh nilai daya maksimum sebesar 193,9 mW dan efisiensi maksimum sebesar 10%. Pada sel surya yang dirangkai paralel diperoleh daya maksimum sebesar 240,3 mW dan efisiensi maksimum sebesar 12,4%. Untuk nilai daya dan efisiensi pada sel surya yang menggunakan lampu halogen pada rangkaian tunggal diperoleh daya maksimum sebesar 169,4 mW dan efisiensi maksimum sebesar 18,5%. Sedangkan pada sel surya yang dirangkai seri diperoleh nilai daya maksimum sebesar 339,1 mW dan efisiensi maksimum sebesar 8,1%. Pada sel surya yang dirangkai paralel diperoleh daya maksimum sebesar 339,1 mW dan efisiensi maksimum sebesar 3,8%.