Judul: Keanekaragaman Laba-laba (Ordo Araneae) di Daerah Mangrove
Abstrak: Spider (Order Araneae, Phylum Arthropod) has high adaptation to different types of environments. Therefore, spider is a cosmopolitan animal due to their ability to live anywhere. The spider can be found in terrestrial, arboreal, and some aquatic habitat. One of the aquatic habitat is mangrove. In every ecosystem, spider is an important component in the food chain i.e. as a predator. Thus, this research was aimed to study the diversity of spider in the mangrove vegetation in Wildlife Reserve and Protected Forest of Muara Angke in Jakarta and the mangrove vegetation in Kolaka, Southeast Sulawesi. Spider was collected using sweeping and beating techniques on the transect lines in each species of mangroves. There were 21 families and 32 genus of spider in two different locations which were Wildlife Reserve and Protected Forest Muara Angke, Jakarta. The dominant families of Araneae in Wildlife Reserve and Protected Forest were Mimetidae, Tetragnathidae, Salticidae, and Oecobidae. Mimetidae has highest abundance from all of the spider families found. Among the four families above, two most dominant genera were existed, i.e. Mimetus and Tetragnatha. Two families of spider which were found in Kolaka were in five genera and the dominant family was Tetragnathidae. The dominant genera spiders in Sonneratia Rhizopora, and Avicennia were Mimetus, Tetragnatha, and Ebo, respectively.
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Judul: Keanekaragaman Serangga di Ekosistem Mangrove: Studi Kasus Hutan Mangrove di Kawasan Pesisir Angke Kapuk, Jakarta Utara
Abstrak: Mangrove is the habitat of various insects which have important function of ecosystem. However, many insect species and their functions in mangrove ecosystem have not been identified yet. This research is aimed to elucidate the species composition of mangrove in relation to the species diversity of insect. This research was conducted in three different mangrove stand in Mangrove Protection Forest of Angke Kapuk and Soedyatmo highway mangrove area. They are monoculture stand of A. marina, mixed stand of A. Marina and R. mucronata, and mixed stand of S. alba and R. mucronata. Sampling was collected by using line quadrat method. There were eight quadrats (10 m × 10 m) suspended at every mangrove stand. Incest traping was using yellow-pan trap method. The result indicates that the mixed stand A. Marina and R. mucronata has the highest value of insects abundance. The dominant insect at every mangrove stand were order of Diptera.
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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