Judul: Analisis Kesesuaian Agroklimat Tanaman Tebu (Saacharum officinarum) di Kalimantan Selatan
Abstrak: Sugar cane (Saacharum Officinarum L) is a plant where sugar came from. Sugar cane has a distinct economic potential. The needs of sugar in this country is getting bigger every year, and it makes government must act faster to give people needs. The purpose of this study is to make South Borneo as a new solution for increasing domestic production of sugar cane. South Borneo has a huge suitable area to expand this commudity. This study is based on the method as described by FAO and used GIS capability for an integration of land qualities to create land unit. A simple map subsystem (Arcview GIS) was used for basic data and models result demonstration on a map. Climatic and soil requirements for sugarcane growth were identified and a land suitability map was produced by overlaying the climatic and soil suitability maps. The land with good capability for agriculture uses is classified as highly suitable (S1) and moderately suitable (S2), the land with a lower quality is classified as a marjinally suitable (S3) and not suitable (N). According to results, 49,26% of the total area or about 1.930.240 ha was good capable for sugarcane uses, and 50,74% is not dedicated for agriculture. The most suitable areas are found in the south of the province. In the rest of the province climatic or soil conditions are expected to restrict sugarcane growth. The results of this study can be used for further research on the possibilities for a large-scale commercialisation of the crop in South Borneo and in other regions with favourable ecological conditions.
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Judul: Pewilayahan tanaman tebu berdasarkan analisis neraca air di Sumatera Utara
Abstrak: Penelitian ini bertujuan untuk menentukan wilayah (zona) agroekologi untuk pengembangan tebu berdasarkan potensi bio-fisik dan menentukan wilayah yang sesuai untuk pertanaman tebu berda- sarkan analisis neraca air di Sumatera Utara. Konsep dan metodologi pendekatan yang digunakan dalam pene- litian ini terdiri dari beberapa tahap. Pertama menentukan wilayah agroekologi tebu melalui super-imposed peta tanah, isohyet, topografi (elevasi) dan lereng. Wilayah agroekologi tebu yang dinyatakan sesuai adalah daerah yang memiliki curah hujan 1000 8 %. 2500 mm per tahun, elevasi 0 1000 m dpl. dan lereng 0 - Kedua, penentuan wilayah kesesuaian tebu dengan "matching" wilayah agroekologi dengan sifat fisik dan kimia lahan (sesuai persyaratan tumbuh tebu). Selanjutnya ditumpang-tindihkan dengan peta tata guna hutan kesepakatan (TGHK)…dst
Keyword: Field crops, Sugar cane

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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