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: Separation of Neodymium from U3Si2/Al Fuel Plate for Burn-Up Determination
Abstrak: Neodymium is a common fission product produced in nuclear fission reactions. Neodymium in this study was chosen as a burn-up indicator for U3Si2/Al fuel element plates because the neodymium isotope is a stable fission product with a fairly high yield. Some procedures were carried out to separate neodymium, starting with the separation of cesium isotopes (137Cs, 134Cs) through the precipitation method, then separation of uranium isotopes (235U, 238U) and plutonium isotopes (239Pu, 238Pu) with Dowex 1x8 ion exchange resin, and separation of neodymium (Nd), samarium (Sm), as well as cerium (Ce) with Dowex 1x4 ion exchange resin. The Cs recovery reached 99.95%. The U and Pu isotopes resulting from the separation are subjected to an electrodeposition process and the weight of each isotope can be measured with an alpha spectrometer. The separation results of Nd from Sm and Ce have been proven using an XRF spectrometer. The neodymium isotopes separation was corrected using the standard addition method, and an average total Nd content of 2.4 ppm was obtained in the PEB U3Si2/Al bottom solution. It is hoped that this separation method can be applied in determining burn-up of nuclear fuel.
Keyword: neodymium, burn-up indicator, U3Si2/Al fuel plate