Judul: Diversity of Reptiles Based on Habitat Disturbance in Production Forest Areas in Boven Digoel Regency South Papua Province
Abstrak: Aktivitas manusia dapat menyebabkan penurunan kualitas habitat termasuk reptil. Penelitian ini bertujuan mendeskripsikan kondisi umum habitat, mengidentifikasi keanekaragaman, kekayaan, kemerataan, dan kesamaan komunitas reptil berdasarkan tipe gangguan habitat di kawasan hutan produksi Kabupaten Boven Digoel, Papua Selatan. Metode penelitian yang digunakan adalah Visual Encounter Survei (VES) dan jebakan lem (Glue Trap). Ditemukan 176 individu dari 5 famili dengan 18 jenis yang berbeda, namun kekayaan jenis tersebut masih berpotensi meningkat berdasarkan kurva akumulasi jenis dan indeks Schao. Keanekaragaman dan kekayaan jenis tertinggi berada di habitat kurang terganggu (H’= 1,113 dan Dmg= 2,495). Kemerataaan jenis di ketiga tipe gangguan habitat tergolong rendah (E= 0,249-0,485) karena terdapat spesies yang mendominasi yaitu Carlia aenigma. Komunitas reptil habitat belum terganggu bersifat unik karena berbeda dengan habitat yang lainnya., Human activities can cause a decrease in the quality of habitat, including reptiles. This research aims to describe the general condition of the habitat, identify the diversity, richness, evenness, and similarity of reptile communities based on the habitat disturbance in the Production Forest Area Boven Digoel Regency, South Papua. Visual Encounter Survey (VES) and glue trap (Glue Trap) are used as research methods. Obtained 176 individuals from 5 families with 18 different species. The richness of these species still has the potential to increase based on the species accumulation curve and the Schao index. The highest species diversity and richness were in less disturbed habitats (H'= 1,113 and Dmg= 2,495). The evenness of species in the three types of habitat disturbance is relatively low (E= 0,25-0,48) because there is a dominating species, Carlia aenigma. The undisturbed habitat of the reptile community is unique because it is different from other habitats.
Keyword: habitat, keanekaragaman, reptil

Judul: Diversity of Amphibians Based on Level of Disturbed Habitat in Production Forest Areas in Boven Digoel Regency South Papua Province
Abstrak: Aktivitas manusia dapat menyebabkan penurunan kualitas habitat, termasuk habitat amfibi. Penelitian ini bertujuan mendeskripsikan kondisi umum habitat, mengidentifikasi keanekaragaman, kekayaan, kemerataan, dan kesamaan komunitas amfibi berdasarkan tipe gangguan habitat di Kawasan Hutan produksi di Merauke, Papua. Metode penelitian yang digunakan yaitu Visual Encounter Survei (VES) kombinasi time search dan transek pada habitat sangat terganggu, habitat kurang terganggu, dan habitat belum terganggu. Ditemukan 124 individu amfibi dari 5 famili dengan 16 jenis yang berbeda. Nilai keanekaragaman tertinggi pada habitat sangat terganggu (H’= 1,941) karena terdiri dari berbagai tipe habitat, namun kekayaan jenis tertinggi ditemukan di habitat belum terganggu. Jenis Hylophorbus rufescens merupakan jenis dominan di habitat kurang terganggu dan habitat belum terganggu. Terdapat penemuan amfibi yang belum dapat diidentifikasi sampai ke tingkat jenis yang menunjukkan kemungkinan adanya jenis yang belum dideskripsikan di lokasi ini.
Keyword: Amphibian, Disturbed, Habitat, Papua

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