Judul: Karakteristik Habitat Bokkoi di Areal IUPHHK-HA PT Salaki Summa Sejahtera Kabupaten Kepulauan Mentawai Sumatera Barat
Abstrak: Bokkoi, (Macaca pagensis) is one of primate of the genus Macaca which belongs to the endemic to the Mentawai Islands. One of its habitat is the concession area of IUPHHK-HA PT Salaki Sejahtera Summa. This research aims to identify characteristic of habitats bokkoi. The observed variables were composed of physical components that includes height above sea level, slope, distance position finds bokkoi from main streets and skid roads, distance from river. Meanwhile the components biotic variables were LmAI and FCD. The result showed that the components of habitat bokkoi that influenced the existence and the number of individual bokkoi were slope (physical) and density of the vegetation at the level of the pole and trees (biotic). Locomotion activity conducted on the land was occurred on flat slope, while the locomotion on trees required continuous canopy. In case of rest activity, bokkoi prefer to use a location that has a pole and tree with high density, low disturbance as well as steep slope. Feeding activities will depend heavily on the existence of a good feed of vegetation on the level of a pole or a tree. Social activities conducted bokkoi requires a high pole density, density, low trees and slope which belongs to the steep ramps
Keyword: Mentawai, habitat, characteristics, bokkoi

Judul: Karakteristik Habitat Joja (Presbytis potenziani Chasen & Kloss, 1928) di Areal IUPHHK-HA PT Salaki Summa Sejahtera, Sumatera Barat
Abstrak: Logging activity in IUPHHK (License for Natural Forest Timber Consesion) activity disturb habitat of joja (Presbytis potenziani). Joja is one of endemic primates in Mentawai Island. This research aimed to analize joja habitat characteristics on logged over forests. The result showed that joja habitat were areas that had trees density of 408.34 ind/ha with leaf area index (LAI) values ranges from 2.7–3.2. The area located at altitude of 50–100 meters above sea level, on at slope between 15–25%, Joja was found within 200–300 meters from the main road or skid trail, and within 300–400 meters from the river.
Keyword: Mentawai, joja, IUPHHK, characteristic habitat

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