Judul: Membran Komposit Polisulfon Tersulfonasi-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is potential as an alternative renewable energy source and unhazardous to environmental. In this study, composite membrane of sulfonated polysulfone-zeolite (sPSf-zeolite) was synthesized and characterized, and observed the performance of the resulted membranes for DMFC. The process of sulfonation has been successful. It showed by the degree of sulfonation as high as 45% and the existence of a new group that trisubstituted 1,2,4 - that shown in the wave numbers of 1724 cm-1 as determined using Fourier transform infrared spectrophotometer. The morphology of membrane surface changed after sulfonation. It was determined using scanning electron microscope. The addition of zeolite to membranes improved membrane’s performance. The composite membrane of sPSf-zeolite 5% activation, using a metal electrode gave the best membrane’s performance. It showed by the highest proton conductivity and voltage with values 1.2377 × 10-3 S/cm and 416 mV. This result showed that the composite membrane of sPSf-zeolite can be applied in DMFC system.
Keyword: Bogor Agricultural University (IPB), zeolite., sulfonated polysulfone, fuel cell, composite

Judul: Membran Komposit Polisufon Tersulfonasi-Natrium Alginat untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Energy demand triggers people to find other renewable energy alternatives, such as fuel cell. In this study composite membrane of sulfonated polysulfone-sodium alginate (sPSf) was synthesized characterized and then applied in direct methanol fuel cell. Sulfonation was started at 40 oC for 1 hour and then sodium alginate was added to improve membrane performances. The degree of sulfonation through sulfonation process was 45% and a peak at 1725 cm-1 in Fourier transform infrared spectrophotometer showed that 1,2,4- substituted sulfonate group exist in ortho position. Composite membrane was produced by adding sulfonated polysulfone and sodium alginate with concentration of 2% and 3%. The composite membrane of sPSf-sodium alginate 3% gave the highest proton conductivity and voltage with values 1.634 х10-3 S/cm and 0.409 volt, respectively. This result showed that the composite membrane of sPSf-sodium alginate can be applied in direct methanol fuel cell system
Keyword: Bogor Agricultural University (IPB), sodium alginate., sulfonated polysulfone, composite membrane, Fuel Cell

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