Judul: Size and Shape Comparison Study in Four Spesies of Hylobates sp.
Abstrak: Siamang and Wau-wau (Hylobates sp.) are found throughout rain forest in South East Asia, Sumatera, Java and Borneo. They are listed as an endangered species. The purpose of this study was to add some information about Siamang (H. syndactylus) and Wau-wau (H. moloch, H. agilis dan H. muelleri) characteristic. The study was done at Taman Margasatwa Ragunan Jakarta and Taman Safari Indonesia Cisarua Bogar. Number of animal to be observed were 26 head, there were nine of Siamang Sumatera, five orowa Jawa, eight of Wau-wau Tangan Hitam (black handed) and four of Wau-wau Abu-abu (Grey). Eight variables of body parts to be measured, values of the hand length, front body length, chest width, chest depth, biiliac width, bitrochanter width, chest girth, achilles' girth and the head parts to be measured were the head length, head width and head height. The t-test was used to took for the similarity and differentiation of the Hydobates body and head measurement. The Principle Component Analysis (PCA) were used for body measurements discrimination.
Keyword: 

Judul: Struktur dan Komposisi Jenis Vegetasi pada Habitat Ungko (Hylobates agilis F.Cuvier 1821) dan Siamang (Symphalangus syndactylus Gloger 1841) di Stasiun Penelitian Hutan Batang Toru Bagian Barat, Sumatera Utara
Abstrak: Gibbon (Hylobates agiliis) and siamang (Symphalangus syndactylus) are the two kinds of Hylobatidae species that inhabit a Sumatera’s forest. One of the Sumatera’s forest region, which was sympatrycally inhabited by the two kinds of Hylobatide, is Western Batang Toru Forest, North Sumatera Province. Gibbon and siamang are arboreal primates that lived exclusively at the forest canopies, and they are highly depended on their habitat’s vegetation condition. This research objectives were (1) to describe the structure, composition and diversity of the trees speciesat the gibbon and siamang habitat and (2) to identify a use of the vegetation by the gibbon and siamang in their habitat. There were three types of the forest in Western Batang Toru Forest namely transitory hill-montane forest formation (FHHM), peat forest formation (FHG) and upper Dipterocarpaceae forest formation (FHDA). All of the forest types in the gibbon and siamang’s habitat had high Shannon-Wiener’s diversity index (H’>3). Structure of that three forest types had an average density at 907 trees/ha with 80,89 m2 basal area value. Tree species with the highest frequency in the three habitat types were Anacardiaceae Campnosperma auriculatum (FHHM), Sapotaceae Madhuca laurifolia (FHG) and Ulmaceae Girroniera subequalis (FHDA). Hylobatidae habitat at Western Batang Toru Forest had a complete forest stratification level which were strata A, B, C and D. The highest space available on the gibbon and siamang habitat was strata C or 11-20 meter height above ground. Gibbon and siamang used mostly strata B and C at their habitat. It was related to the vegetation support for Hylobatidae movement and protection in their habitat, as well as food resources’s availability on those strata. Protection effort has to do to protect Western Batang Toru Forest ecosystem, because those forest region still get a threats and pressures from gold mining and logging area recently.
Keyword: 

Judul: Pemanasan Sekunder Reaksi Fusi Plasma dengan Menggunakan Radio Frequency
Abstrak: Plasma merupakan bentuk ke-empat dari materi setelah padat, cair dan gas yang terbentuk dari proses ionisasi gas. Plasma dapat digunakan dalam reaksi fusi, yaitu reaksi penggabungan dua inti atom ringan menjadi inti atom yang lebih berat sambil melepaskan energi. Untuk mendapatkan energi dari reaksi fusi, inti yang akan direaksikan harus dipanaskan pada temperatur yang sangat ekstrem tingginya. Salah satu cara agar dapat mencapai kondisi ini adalah memberikan pemanasan tambahan atau pemanasan sekunder kepada plasma dalam reaksi fusi tersebut. Nilai daya serap rata-rata ion Deuterium yang sesuai dengan selang nilai daya dari data ITER adalah daya yang menggunakan frekuensi 50 MHz sampai dengan 60 MHz. Dengan menggunakan frekuensi 60 Hz diperoleh nilai daya rata-rata yang diserap sebesar 1,235.10-12 W.
Keyword: gelombang radio, pemanasan sekunder, plasma, reaksi fusi