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: Komparasi Anatomi Skelet Kepala Badak Kalimantan (Dicerorhinus sumatrensis harrissoni) Dengan Badak Sumatera (Dicerorhinus sumatrensis sumatrensis).
Abstrak: Penelitian ini bertujuan untuk mempelajari dan mengalisa struktur skelet kepala badak kalimantan (Dicerorhinus sumatrensis harrissoni) yang dibandingkan dengan skelet badak sumatera (Dicerorhinus sumatrensis sumatrensis) serta dikaitkan dengan perilakunya. Penelitian ini menggunakan skelet kepala badak kalimantan, Najaq, berasal dari Kutai Barat, Kalimantan Timur untuk dianalisa struktur tulangnya dibandingkan dengan skelet kepala badak sumatera, Dusun, yang ada di Laboratrium Anatomi FKH IPB. Penelitian ini menunjukkan bahwa ukuran skelet kepala dan volume cavum cranii badak kalimantan lebih kecil dibandingkan badak sumatera, bagian cranial ujung apex nasii relatif lebih datar sedangkan pada badak sumatera relatif melengkung ke arah ventral. Bagian caudal skelet kepala memiliki posisi lebih vertikal dibandingkan badak sumatera. Facies parietale skelet kepala badak kalimantan relatif lebih sempit sesuai dengan volume cavum cranii. Badak kalimantan memiliki formulasi gigi I2/1, C0/0, P3/3, M3/3. Badak kalimantan memiliki dentes incisivus II (I2) pada rahang atas, tidak seperti anggota famili Rhinocerotidae lainnya yang hanya memiliki dentes incisivus I (I1). Hasil pengamatan keausan gigi badak kalimantan secara umum menunjukkan usia badak kalimantan yang diteliti sudah tua. Secara umum skelet kepala badak kalimantan memiliki karakteristik yang berbeda dari badak sumatera.
Keyword: anatomi, badak kalimantan, rhinocerotidae, skelet kepala