Judul: Studi Autekologi dan pengaruh invasi akasia (Acacia nilotica) (L.) Willd. ex Del. terhadap eksistensi savanadan strategi penanganannya di Tamana Nasional Baluar Banyuwangi Jawa Timur
Abstrak: Tujuan yang ingin dicapai dari penelitian ini adalah untuk: (a). Mengetahui autekologi meliputi; siklus hidup, fenologi, produksi biji, pemancaran biji, dan struktur tagakan A. nilotica di Taman Nasional Baluran, (b). Mengetahui derajat invasi A. nilotica di Taman Nasional Baluran dan upaya yang telah dilakukan), (c). Mengetahui pengaruh invasi A. nilotica terhadap komposisi spesies, Indeks Keanekaragaman Spesies (H'), Indeks Similaritas (IS), asosiasi spesies, biomasa tumbuhan bawah dibandingkan dengan daerah yang belum terinvasi A. nilotica.
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Judul: Analisis pengaruh jenis asing invasif acacia nilotica Wild. ex Dell 1813 terhadap pola pergerakan banteng (Bos javanicus d’Alton 1823) di Padang Savana Bekol, Taman Nasional Baluran
Abstrak: Bos javanicus d’Alton 1823 (banteng) is a rare and threatened species in the world. In Indonesia, it was conserve in some place, i.e: Baluran National Park. This research investigated the affected factors and effects of Acacia nilotica Wild ex. Dell 1813 invasion on the pattern of banteng movement in Bekol Savanna, Baluran National Park by built the correlation of conservation variable. The objective of the research is to build a conservation model of banteng. This is done by simulating the dynamic model consists of green forage and the effect of Acacia nilotica invasion to determine the carrying capacity in savanna Bekol. Field research began in August through to October 2005 at Bekol Savanna, Baluran National Park, East Java. A system dynamic approach was used since it has demonstrated its capability as a tool to support management for environmental decision. The model is built using software by Powersim Constructur 2.5 to make a prediction about the future behaviour of banteng conservation system. Results revealed that banteng in Bekol Savanna are responsed of movement space and the growth of Acacia nilotica reduced the movement space and forage productivity of Bekol savanna. Based on the simulated model, it was concluded that Acacia nilotica invasion has changed the structure of banteng habitat this resulted in the decrease population of banteng in Bekol savanna.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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