Judul: Populasi Scaptodrosophila Duda (Diptera: Drosophilidae) pada Bunga Jantan Kelapa Sawit (Elaeis guineensis Jacq) di Kebun Cimulang PTPN VIII Bogor, Jawa Barat
Abstrak: Scaptodrosophila (Drosophilidae) is insect visiting male flower of oil palm. This study addressed to study population of the Scaptodrosophila in male flower of oil palm (E. guineensis) and weather elements that affected their population. Scaptodrosophila population were observed by scanning method in male flowers spikelet in April, May, and June 2012. Weather element, i.e., air temperature, light intensity, and relative humidity were measured. Relationship between weather element and Scaptodrosophila population were analyzed by scatter plot, korelasi Pearson, and biplot using SPSS 16.0 and Minitab 16. Results showed that population of Scaptodrosophila was highest at noon (102 individual/bunch) and lowest at afternoon (88 individual/bunch). In June, population of Scaptodrosophila was highest (167 individual/bunch) and lowest in April (16 individual/ bunch). Light intensity and air temperature correlated positively with population of Scaptodrosophila.
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Judul: Keragaman Serangga Pengunjung Bunga Jantan Kelapa Sawit .. (Elaeis guineensis Jacq.)
Abstrak: Oil palm (Elaeis guineensis Jacq.) is one of the plantation crops that became the source of non-oil foreign exchange earner in Indonesia. Oil palm is monoecious plant, in which the same tree bears male and female flowers. Generally a male and female flowers do not bloom simultaneously. Consequently, cross-pollination with weevils help is needed. A weevil species, Elaeidobius kamerunicus is an effective pollinating insect of oil palm because it is specific and well adapted either in wet or dry seasons. The objective of this research was to study the diversity of insects that visit male flowers of oil palm besides E. kamerunicus. The observations were conducted during three days in each month, ie May, June and July 2011 for 10 minutes using fix sample method. During the observation, the name and the number of individual species of insects visiting the male flowers of oil palm were recorded. Performance of weather elements, ie temperature, humidity, and light intensity were measured. Further, insects identification were conducted in the laboratory. Results showed that, besides E. kamerunicus, in PTPN VIII, AFD IV Toge, Garden Cikasungka Bogor were found Rhynchomyia, Scaptodrosophila (Diptera), Diplatys, Forficula (Dermaptera), Camponotus, Dolichoderus, Cerapachys, Crematogaster, and Heteroponera (Hymenoptera). Scaptodrosophila was the dominant visitor insect. Dermaptera and Hymenoptera were predatory insects. The diversity and evennes of insects visiting male flowers of oil palm were low (H’ = 0,59 and E = 0,27).
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Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik