Judul: Membran Polistirena Terfluorinasi untuk Aplikasi pada Microbial Fuel Cell
Abstrak: Microbial fuel cell (MFC) is a fuel cell that utilizes microbial activity as a source of its energy. The microbe used was from cow’s rumen liquid. The higher numbers of microbe, the higher the microbial activity . The electrolyte used in the MFC system was a fluorinated polystyrene membrane (PSf). Synthesis of PSf was done by using triethylamine trihydrofluoride with various composition, namely 5, 10, and 15%. Based on Fourier transform infrared spectroscopy (FTIR) result, fluorine atoms has been substituted into the aromatic ring of the polystyrene. The results of scanning electron microscope (SEM) states that the PSf membrane is a nonporous membrane so that is good to be used as an electrolyte in fuel cell. Proton conductivity test shows that membrane of 5% PSf has the highest proton conductivity. The PSf membrane can be applied in MFC system well. It known according to the value of potential difference generated by PSf 5, 10, and 15%, which are 8, 12, and 15 mV, respectively.
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Judul: Sintesis dan Karakterisasi Membran Polistirena Terfluorinasi untuk nnnnnnnDirect Methanol Fuel Cell
Abstrak: One of common energy resources is direct methanol fuel cell (DMFC), which use methanol as fuel. The important component in DMFC is proton exchange membrane. The study used fluorinated polystyrene membrane (PSf) as proton exchange membrane through fluorination process. PSf membrane was made with PSf concentration of 5%, 10%, and 15 %. Fluorination has caused change of membrane physical properties with presence of pores in the membranes. The best water uptake was shown by PSf 5% that is 11.07%. Membrane activation increased the proton conductivity from 0.52 × 10-7 S/cm to 0.54 × 10-7 S/cm for polysryrene (PS) and 0.44 × 10-7 S/cm to 0.69× 10-7 S/cm for the PSf. Qualitative test of methanol permeability showed good result with dry underneath the surface of membrane because methanol did not pass through the membrane. In DMFC system, proton conductivity of the PSf membrane is higher than that of PS membrane, while variation of conductivity from PSf membranes is caused by gaps at the PSf membranes.
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Judul: Keanekaragaman Spesies Burung Pada Beberapa Ketinggian Di Resort Gunung Putri Taman Nasional Gunung Gede Pangrango
Abstrak: Keanekaragaman Spesies Burung Dipengaruhi Oleh Beberapa Faktor Seperti Ketinggian Tempat, Vegetasi Dan Suhu. Tujuan Penelitian Ini Untuk Membandingkan Keanekaragaman Di Berbagai Ketinggian Tempat Dan Mengidentifikasi Kelompok Burung Campuran. Penelitian Dilakukan Pada Ketinggian 1600, 1800, 2000, 2200 Dan 2400 Mdpl Di Resort Gunung Putri, Taman Nasional Gunung Gede Pangrango. Suhu Dan Kelembaban Diukur Dengan Termometer Bola Basah-Bola Kering. Data Vegetasi Diambil Dengan Metode Jalur Berpetak. Data Burung Dikumpulkan Dengan Metode Titik Hitung Dan Look And See. Jumlah Spesies Dan Indeks Keanekaragaman Burung (H’) Mengalami Penurunan Mulai Pada Ketinggian 2000 Mdpl. Nilai Indeks Keanekaragaman Tertinggi Ada Pada Ketinggian 2000 Mdpl (H’=2,40). Kelompok Campuran Yang Teridentifikasi Sebanyak 5 Kelompok Di Ketinggian 2000-2400 Mdpl. Srigunting Kelabu (Dicrurus Leucapheus) Dan Srigunting Bukit (Dicrurus Remifer) Merupakan Pemimpin (Nuclear) Dalam Kelompok Dan Munguk Loreng (Sitta Azurea) Dan Kacamata Gunung (Zosterops Montanus) Merupakan Spesies Yang Paling Banyak Dijumpai.
Keyword: Gunung Putri, Keanekaragaman, Ketinggian Tempat, Spesies Burung