Judul: Studi Faktor-Faktor Penentu Keberhasilan Pelepasliaran Orangutan Suamtera (Pongo abelii Lesson, 1827) di Taman Nasional Bukit Tiga Puluh, Propinsi Riau dan Jambi
Abstrak: The population of Sumatran Orangutan (P. abeii) nowadays in nature keep decreasing as the impacts of gross land destruction because of human's needs to land area and woods in high level. This condition become more serious when human's wants to make Orangutan (P.abeii)become endangered in its native habitat. Protection and rehabilitation methods that was done could not avoid or prevent speed of extinction of this animal in nature. Reintroduction is the modern rehabilitation activity by releasing some indicidues to the wildlife or by preparing siezumed animals become feral to conservation forest area as a new habitat where the species is not present at the moment. This study was done in august to December 2006 at Station of Sumatran Orangutan Reintroduction Centre in Buffer zone Bukit Tiga Puluh National Park, Kabupaten Tebo, Province of Jambi. The aim of this study was to measure the influence of determining factors to Orangutans reintroduction succesful to their native habitat and to identify other factors which give impact to reintroduction succesful. The results of this study are expected can give informations of succesful determination by using factors to Sumateran Orangutan reintroduction succesful in native habitat
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Judul: Tingkat Keberhasilan Pelepasliaran Orangutan Sumatera (Pongo Abelii Lesson 1827) Ex-Captive Di Pusat Reintroduksi Orangutan Sumatera Provinsi Jambi
Abstrak: Reintroduksi orangutan Sumatera ex-captive ke Ekosistem Bukit Tigapuluh merupakan Program Konservasi Orangutan Sumatera yang telah diatur dalam Strategi dan Rencana Aksi Konservasi orangutan 2007 – 2017, bertujuan untuk menghindari kepunahan spesies orangutan khususnya orangutan Sumatera. 158 individu telah dilepasliarkan yaitu sebanyak 35% berhasil dan hidup mandiri, 15% gagal. 79 individu atau 50% lainnya hilang kontak dan tidak ada data keberadaan. Penilaian perilaku orangutan ex-captive pasca pelepasliaran dilakukan terhadap individu muda jinak, muda semiliar dan dewasa dengan uji nyata pada nilai p<0,05. Pola aktivitas makan, istirahat dan aktivitas lain pada ketiga kelompok berbeda nyata, sedangkan aktivitas bergerak atau berpindah tidak berbeda nyata. Proporsi memakan buah, serangga, kambium dan pakan lain berbeda nyata pada ketiga kelompok. Sedangkan memakan daun, stem dan pakan dari teknisi tidak berbeda nyata. Ketiga kelompok banyak beraktivitas di ketinggian 10m - < 20 m dan menunjukkan tidak ada perbedaan nyata. Orangutan ex-captive muda semiliar memiliki tingkat keberhasilan yang lebih tinggi dibandingkan kelompok muda jinak dan dewasa. Faktor yang menyebabkan kegagalan adalah stres yang tinggi, kesehatan terganggu, kehilangan kemampuan foraging, kehilangan kemampuan beraktivitas di kanopi, tidak mampu menghindari ancaman, dan masih tertarik terhadap aktivitas manusia.
Keyword: orangutan Sumatera,, ex-captive, keberhasilan pelepasliaran, umur, perilaku.

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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