Judul: Keanekaragaman Amfibi di Kabupaten Murung Raya, Kalimantan Tengah
Abstrak: Species diversity is one of variable that needed for conservation management. The research about amphibian diversity is still lack, especially on Kalimantan. The objective of this study is to identify amphibian diversity on aquatic and terrestrial habitats also level of amphibian diversity. The research conducted on 1st August until September 30rd 2011. The study shows that Leptolalax hamidi classified as Vulnereable base on IUCN Red List and 11 amphibian species are endemic on Kalimantan. Satai river have the highest number of diversity, about 2,47 and Luan river is the lowest, about 2,05. The diversity number in this study is better than another amphibian research in the diferent location on Kalimantan
Keyword: diversity, Central Kalimantan, amphibian

Judul: Keanekaragaman Amfibi pada Beberapa Tipe Habitat di Taman Nasional Kutai Kalimantan Timur
Abstrak: Keberadaan amfibi di Taman Nasional Kutai masih belum banyak diketahui karena minimnya penelitian amfibi di TN Kutai. Informasi mengenai amfibi penting bagi upayapengelolaan konservasi jenis. Penelitian ini bertujuan untuk mengidentifikasi komposisi jenis amfibi, mengukur nilai keanekaragaman amfibi pada beberapa tipe habitat dan mengidentifikasi faktor-faktor penentu kehadiran jenis amfibi di TN Kutai. Metode yang digunakan dalam penelitian ini yaitu Visual Encounter Survei (VES) yang dikombinasikan dengan panjang jalur transek. Penelitian ini dilakukan di empat tipe habitat yaitu hutan dataran rendah, hutan rawa, hutan mangrove dan hutan kerangas. Ditemukan 22 jenis amfibi (N= 146 individu) yang berasal dari 6 famili. Jenis yang paling banyak ditemukan yaitu Amnirana nicobariensis. Nilai keanekaragaman amfibi tertinggi adalah pada tipe habitat hutan dataran rendah (H’=2.63) dibandingkan dengan tipe habitat lain. Faktor dominan yang paling berperan dalam kehadiran jenis yaitu kelembaban relatif (jalur terestrial) dan keberadaan substrat batu (jalur akuatik).
Keyword: Amphibian, diversity, Kutai National Park

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition