Judul: Karakterisasi sifat-sifat tanah dan laahn untuk kesesuaian lahan tanaman kunyit (Curcuma domestica Val.)
Abstrak: Community's trend in the use of plant for medical treatment or beauty has opened a chance in the biopharmacy agribusiness in Indonesia. Turmeric as one of a rhizome plant has an important role in medicinal plant industry. Quality of turmeric's product is definited by the content of curcumin, performance and size of rhizome. Most of all, curcumin's quality depend on interaction between the genetic factor and growth environment. This research was aimed to study the relation between rhizome and bioactive turmeric production and land quality in order to determine land evaluation criteria and to evaluate land evaluation criteria on some samples from Bogor. This research was an extention from an earlier studies which were done at Icaranganyar Central Java, Ngawi and Lamongan East Java in 2004, and followed by other studies in Sukabumi, Indramayu, Cianjur and Bogor West Java. Soil and bio active analysis were conducted in Soil Chemical and Fertility laboratory in Department of Soil and Land resourcces and in Biopharmacy laboratory IPB. Results of the study indicated that the relation between rhizome and curcumin production and land qualities spread with such particular pattern which is convined with boundary line. By making the production classes for S2, S3 and N with each class values by 85%, 60% and 30%, where 30% is the break event point of productivity. The limits of every classes in the land evaluation criteria for each land qualities can be made by creating a projection of intersection between the boundary line and the yield cut off. The land evaluation criteria that was an exploration study base, did not evaluate entirely all of the crop requirements. More data from a wider soil agroclimate zone therefore would be greatly appreciated.
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Judul: Evaluasi penyebaran tanaman obat temulawak(Curcuma xanthorriza Roxb) dan kunyit(Curcuma domestica Val) dengan aplikasi sistem informasi geografi(SIG) : studi kasus di Kabupaten Karanganyar, Jawa Tengah)
Abstrak: penelitian Tanaman obat di Indonesia khususnya temulawak dan kunyit memiliki potensi sebagai produk agrobisnis yang unggul jika faktor-faktor yang mempengaruhi kualitas dan produktifitas tanaman ini ditingkatkan. Faktor-faktor yang mempengaruhi tanaman ini terutama bahan bioaktif kurkumin, biomassa tanaman, kualitas agrobiofisik lahan dan penyebarannya. Di Indonesia, pada umumnya produktifitas tanaman ini diukur berdasarkan biomassa tanaman dan belum banyak melibatkan senyawa bioaktif kurkumin sedangkan evaluasi penyebarannya masih berupa data-data statistik (non spasial). Maka dilakukan penelitian ini untuk mengevaluasi penyebaran tanaman obat dengan teknologi aplikasi Sistem Informasi Geografi (SIG) yang dapat menyajikan dan mengolah data spasial maupun non spasial. Aplikasi SIG yang digunakan dalam penelitian ini menggunakan data primer (Data survei lapang) dan data sekunder (peta rupabumi skala 1:25000, peta tanah, data analisis senyawa bioaktif kurkumin, biomassa tanaman. produksi. kuosioner) dengan menggunakan operasi pemanggilan data. klasifikasi. generalisasi, tumpang-tindih. pengukuran, penelusuran (search). dan pembuatan Digital Elevation Model (DEM)...
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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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