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: 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: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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