Judul: Distribusi Sarang Dan Jelajah Harian Orangutan Sumatera Rehabilitan (Pongo Abelii Lesson, 1827) Di Stasiun Reintroduksi Orangutan Sumatera Sungai Pengian, Kabupaten Tebo, Provinsi Jambi
Abstrak: Natural distibution of sumatran orangutans are limited in the province of Nanggroe Aceh Darussalam and province of North Sumatra, which population is easily disturbed. Large number of orangutans that live outside their habitat, both domesticated and for trading, need rehabilitation for sumatran orangutan. sumatran orangutan reintroduction station Sungai Pengian is place to rehabilitate sumatran orangutan from Natural Resources Conservation Center (BKSDA) confiscated. Study on nest distribution and daily range of sumatran orangutan rehabilitant is need to conduct to determine the distribution of orangutans rehabilitant. Study was conducted on April until June 2009 at Pengian River Sumatran Orangutan Reintroduction Station, Tebo District, Province of Jambi. The purpose of this study was to determine the distribution of nests, daily range and orang-utan habitat constituent components sumatran orangutans rehabilitant. Data retrieval is done by following the path of transect to nest distribution of orangutans, orangutans daily range conducted by following the daily movements of individuals ranging from wake up in the morning until the orangutans back to the sleep in the nest. Nests distribution of rehabilitant sumatran orangutan in secondary forest vegetation former fields (25 nests/ha) and former logging (18.1 nests/ha) higher than the primary natural forests (1.3 nests/ha). This related to the location that not to far from orangutan reintroduction and education center. Orangutan also prefer alluvial plains mainly in the surrounding the river. Average daily range of sumatran orangutans rehabilitant are 463.8 m/day (206–732 m/day) and the estimated area of rehabilitant sumatran orangutans used polygon method are 23.16 ha (7.41–51.38 ha). Daily and extensive range of sumatran orangutans rehabilitant is lower than wild orangutans because of rehabilitant orangutans still in the socialization and learning level, so the ability to explore and find food is still less than wild orangutans.
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Judul: Spatial Distribution of Sumatrean Orangutan (Pongo abelii Lesson, 1827) Activity Trace on Suaq Belimbing Reaserch Station Gunung Leuser National Park
Abstrak: Orangutan sumatera (Pongo abelii) adalah spesies kera besar yang hanya ditemukan di bagian utara Pulau Sumatera, salah satu lokasi persebarannya adalah di Stasiun Penelitian Suaq Belimbing. Keberadaan orangutan sumatera terancam karena populasi yang menurun setiap tahunnya dikarenakan peningkatan laju deforestasi, tingginya angka perdagangan ilegal dan perburuan liar, sehingga perlu dilakukannya upaya konservasi. Meskipun demikian orangutan adalah satwa yang sangat sensitif, maka cara terbaik adalah dengan mengamati pola penggunaan ruangnya. Penelitian ini bertujuan untuk mengidentifikasi jenis jejak aktivitas, mengetahui bentuk sebaran jejak aktivitas, dan menganalisis hubungan jejak aktivitas dengan kelas kelerengan, tipe tutupan lahan, jarak dari sumber air, dan jarak dari permukiman. Pengambilan data dilakukan secara simultan menggunakan metode transek jalur sepanjang 1 km dengan jumlah 4 jalur pengamatan. Jenis jejak aktivitas orangutan sumatera yang ditemukan berupa sisa pakan dan sarang. Sebaran spasial jejak aktivitas orangutan sumatera berbentuk mengelompok (IM =1,18) di hutan rawa sekunder dengan topografi landai yang dekat dengan sumber air (<1000 m) dan dekat dengan permukiman (<2000 m).
Keyword: Gunung Leuser National Park, spatial distribution, Suaq Belimbing Reaserch Station, sumatrean orangutan

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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