Judul: Manajemen lanskap untuk penanggulangan konflik antara manusia dan Orangutan (Pongo abelii) di Taman Nasional Gunung Leuser dan sekitarnya
Abstrak: Orangutan Sumatera merupakan satwa endemik Pulau Sumatera. Salah satu habitat dengan populasi tertinggi terdapat di Taman Nasional Gunung Leuser (TNGL). Ancaman utama bagi kelangsungan hidup orangutan Sumatera (Pongo abelii) di TNGL adalah kerusakan habitat dan perburuan liar. Hal inilah yang menyebabkan konflik antara manusia dan orangutan. Tujuan penelitian ini 1) mengidentifikasi distribusi lokasi konflik manusia dan orangutan; 2) menganalisis persepsi masyarakat terhadap orangutan dan konflik; 3) menganalisis karakteristik lanskap terjadinya konflik; dan 4) menyusun rekomendasi manajemen penanggulangan konflik antara manusia dan orangutan Sumatera. Analisis Komponen Utama (AKU) dikombinasikan dengan SIG (Sistem Informasi Geografi) dan merupakan metode utama dalam penelitian ini. Peta penutupan lahan dan DEM digunakan untuk pangkalan data spasial. Teridentifikasi 26 lokasi konflik pada tahun 2012-2014. Persepsi masyarakat sebagian besar terhadap orangutan adalah hama dan buruan. Hasil AKU menunjukkan tiga komponen utama yang merupakan karakteristik lanskap tempat terjadinya konflik yaitu habitat orangutan yang terkonversi (97 906 ha), habitat orangutan yang tersisa (985 739 ha), dan habitat orangutan yang terfragmentasi. Manajemen lanskap yang direkomendasikan untuk mengelola konflik manusia dan orangutan adalah restorasi area hutan yang telah dikonversi ke perkebunan kelapa sawit, membuat koridor ekologi, membuat penghalang, dan meningkatkan kesadaran dan pengetahuan masyarakat tentang konservasi orangutan.
Keyword: GIS,, Gunung Leuser National Park, Human-wildlife conflict, Pongo abelii,, Principal Component Analysis

Judul: Studi Habitat dan Perilaku Orang Utan (Pongo pygmaeus abelii) di Bohorok Taman Nasional Gunung Leuser.
Abstrak: Orang-utans are big primates living arboreally and solitarily. Their solitary characteristics, wich was found to be quite different from those of other primate species, have been one of the difficulty factors for discovering them in their dwelling places in forests. This in turn, have resulted in a limited number of orang-utans having systemtically been traced during the course of data. collection. The study was aimedd to explore the habitat, daily activities and population of orang-utans related to habitat condition of Bohorok Nastional Park located in Gunung Leuser, and was carried out in forest areas of Sungai Landak and Sungai Musam, from July 1991 until January 1992. Survey methods employed were both the descriptive and qualitative methods. Observations on habitat conditions have included forest structure, vegetation type and composition, preference of food types and home range. Observations on feeding behavior, movements, restings and defensive behaviour to human disturbances and predators within their home range have also been carried out. Vegetation analysis have been carried out by using multiple plot method, and 144 sample plots have been obtained from five longitudinal stripes in forest areas of Sungai Landak and Sungai Musam. ehowed that the dominant species was materialis) with INP of Vegetation analysis 'damar laut' (Shorea 20.06%, 'kayu minyak' (Dipterocarpus sp.) with INP of 19.5%, 'samak jambu (Ixonanthus icesandra) with INP of 15.60%, and 'kayu merah' (Eugenia sp.) with INP of 13.1%. Tree density was fourd to be relatively low, i.e.. only 216 trees/ha, with species variability index (Shannon Wiener Index) of 3.78 and uniformity index of 0.83. Species variability index was considered relatively high and consisted of various age levels of natural forests. Among the various species related to tree densities, the densities of those which served as principal food sources of orang-utans, have been found to be relatively low. Tree density of Ficus sp. for example, was only 0.90 trees/ha, rambung-rambung' (Vernonea arborea) 1.67 trees/ha, rengas' (Gluata rengas) only 0.69 trees/ha, 'baju barus' (Manglietia glauca) 0.83 trees/ha, 'banitan' (Polyanthia glauca) 0.83 trees/ha.
Keyword: Pongo pymaeus abelii

Judul: Sintesis Nanokristal Magnetit Menggunakan Urea sebagai Penjerap Cr(VI)
Abstrak: The study was to synthesize and characterize magnetite nanocrystal. Magnetite powder was synthesized using hydrothermal method from FeSO4 as precursor and sodium hydroxide and urea as the base sources. Characterization of the obtained powder was carried out using X-ray diffraction, scanning electron microscope, and energy dispersive X-ray analyzer. The crystallite size of magnetite by X-ray diffraction was obtained from 18,23 to 67,34 nm. The scanning electron microscope observations showed that magnetite particles underwent agglomeration. Magnetite powder was used as Cr(VI) adsorbent. The results showed that adsorption capacity for urea-based magnetite at pH 1-5 in 2 hours were 1.92; 1.91; 1.59; 1.20; and 1.21 mg/g, respectively. Adsorption capacity for sodium hydroxide-based magnetite (pH 1-5, 2 hours) were 1.74; 1.83; 0.64; 0.69; and 0.77 mg/g. The results indicated that urea-based magnetite is able to increase adsorption capacity.
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