Judul: Jenis dan Karakteristik Koloni Kutudaun (Hemiptera: ...Aphididae) pada Gulma di Bogor
Abstrak: Information on the aphids that associated with weeds is relatively limited. The research aimed to study the diversity of aphids and their colony characteristics in weeds at Bogor. The experiments were conducted by doing aphid sampling in 20 locations at Bogor area. Size of colonies, winged aphids (alatae), wingless aphids (aptera), symptomp caused by aphids, and aphids-ants association were observed. Slide preparation of aphids were used to identify the species. The studies have shown that there were nine aphid species found in weeds in Bogor area:, Aphis craccivora Koch, Aphis euginae van der Goot, Aphis gossypii Glover, Aphis spiraecola Patch, Hysteroneura setariae (Thomas), Jaksonia papillata Theobald, Melanaphis sorghi (Theobald), Schizapis graminum (Rondani), and Sitobion miscanthi (Takahashi). H. setariae was found numerously on the weeds. Wingless aphids was found in a big number of population. Weeds belong to the Family Asteraceae were the most attacked by aphids. Fifteen species of ants associated with aphids, they were Acanthomyrmex sp., Acropyga sp., Cardiocondyla sp., Camponotus sp., Cerapachys sp., Crematogaster sp., Dolichoderus sp., Loweriella sp., Monomorium sp., Myrmecina sp., Paratrecina sp., Philidris sp., Polyrhachis sp., Pseudolasius sp., and Tetramorium sp. The pictorial and dichotomy identification keys of aphids were constucted based on the morfological characters.
Keyword: Bogor Agricultural University (IPB), weeds., identification key, colony, aphids, ants

Judul: Identifikasi Kutudaun (Hemiptera: Aphididae) pada Tanaman Buah di Bogor
Abstrak: Aphids (Hemiptera: Aphididae) is a group of insect pests that have a very wide host range. Almost all plants are the host of aphids. Aphids can reduce the quality and quantity of fruit. This research aimed to know the species diversity of aphids on fruit crops in Bogor. The method used in this research is by collecting aphids and ants on 13 districts in Bogor. Sample of aphids were put in plastic bag then labelled by the location and the name of host plants. Samples then were taken to the laboratory and the number of individuals and the number of winged and wingless aphids in the colony were counted. Aphid specimens in the microscope slides were used for identification to species level using published keys based on morphological characters. Identification of aphids were using these keys: Aphids on the World’s Trees, Aphids of the World Crop, and Aphids on the World’s Herbaceous Plants and Shrubs. There were seven aphid species identified, they were Aphis gossypii Glover, Aphis spiraecola Patch, Brachycaudus helichrysi (Kaltenbach), Pentalonia nigronervosa Coquerel, Toxoptera aurantii (Boyer de Fonscolombe), Toxoptera citricidus (Kirkaldy), and Toxoptera odinae (van der Goot). T. aurantii was the most abundant aphid species found in the area. The plant family of Myrtaceae was the most host frequently attacked by aphids. The ants found in the aphid colonies were Dolichoderus sp. and Technomyrmex sp. Based on the morphological character, a pictorial and dichotomous keys of aphids associated with fruit crops were constructed
Keyword: Bogor Agricultural University (IPB), identification., hemiptera, fruit, Aphididae, Aphids

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