Judul: Ketersediaan Pakan antar Kelompok Simakobu (Simias concolor) di Hutan Peleonan, Siberut Utara, Kepulauan Mentawai
Abstrak: The endemic primate Simakobu (Simias concolor) in Mentawai is endangered due to habitat decreases. The purpose of this study was to discover the availability of food trees in the home ranges of two groups of Simakobu, Aldran group and Aldo group. Each of them consists of a different number of group members. Although Aldran group has more group members, Aldo group’s home ranges is 0,4 Ha wider than Aldran’s. However, the variety of food trees in Aldran’s home range is 11.8 % higher than Aldo’s. There are 113 species of trees inventoried in Peleonan forest and 53 types of which are food sources of Simakobu. Coccoseras borneensis is the most dominant food tree available in the both regions. Simakobu’s preferences are the young leaves and fruits. In general, the food abundance and variety in both home ranges are still adequate. The less varied food trees available in Aldo’s area and the group composition are expected to be the driving factors that made Aldo group explores more and eventually has a wider home range.
Keyword: the availability of food tree, Simias, simakobu, Siberut, Mentawai Islands

Judul: Studi Perilaku Simakobu (Simias concolor Miller, 1903) dan Pola Penggunaan Habitat di Area Siberut Conservation Programme, Sumatera Barat
Abstrak: Simakobu was one of endemic primates in Siberut island that become attention of Siberut Conservation Programme. This species was threatened mainly by heavy hunting and commercial logging by local people. This study aims to determine the behavior of simakobu and habitat use. This research was conducted from July 2011 until January 2012 in SCP. Pattern of behavior data collected via Scan Sampling. The results found that simakobu in exploiting their food used more sitting posture than hanging posture. Actively grooming often existed between female and juvenile and passively grooming existed on male. The highest percentage calls of simakobu was occurred at 07.00-08.00 am with loud call duration in 20-30 second. Simakobu often used space between the first branch of the tree to the canopy at 21-25 meter in height.
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Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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