Judul: Persamaan Korteweg-de Vries Orde Tinggi untuk Menggambarkan Gerak Gelombang Internal
Abstrak: The ocean can be considered of layers of fluid that each layer has a constant density. Internal waves are waves occur in the interface of every'two layers with different density. Because it occures underneath the surface of the ocean, it is invisible. One of internal waves is internal solitary waves. One of formulation that can describe intemal waves movement is KdV equation. KdV equation is derived from governing equations of ideal fluid in Lagrange formulation using asymptotic method. On this thesis, KdV equation is derived in higher order and then its solution is derived by using internal solitary waves assumption. An example of a two-layer fluid is a case will be used. By using Mathematica6 software, for this case will be obtained the coefficients in lower and higher order explicitly and the corresponding between coefficients and relative lower layer depths and fluid depths, the corresponding between coefficients and relative densities, and also observed the different between solitary waves in lower and higher order.
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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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Judul: Pengaruh bahan rempah sebagai repelen terhadap mencit rumah (Mus musculus L. Rodentia: Muridae) dalam mengkonsumsi umpan dan redentisida
Abstrak: Tikus dan mencit merupakan salah satu hama penting yang selalu menimbulkan kerusakan besar pada berbagai tanaman pertanian baik waktu di lapangan maupun produknya di penyimpanan. Setidaknya ada 19 spesies tikus dan mencit yang diduga sebagai hama penting pada beberapa negara di Asia Tenggara dan di pulau-pulau Pasifik. Dari 19 spesies ini Mus musculus mencapai 17,4% sebagai hama di pertanian dan permukiman penduduk. Mencit dapat menyebabkan kerusakan pada tanaman secara langsung dengan mengerat dan memakannya. Pengendalian mencit sebenarnya telah dilakukan antara lain pengendalian secara fisik, mekanis, biologi, sanitasi lingkungan, dan fumigasi asap beracun, tetapi dalam pelaksanaannya masih belum efektif sehingga belum diperoleh hasil yang memuaskan. Pengendalian dengan menggunakan umpan beracun terutama dari jenis rodentisida antikoagulan lebih disukai karena lebih praktis, mudah diaplikasikan, dan lebih cepat berhasil. Dalam beberapa hal, penggunaan rodentisida sintetik memiliki beberapa kekurangan. Repelen dapat digunakan untuk mengusir hama hanya pada wilayah tertentu dan waktu yang terbatas kecuali pada kondisi yang mendukung keberadaan hewan pengerat tersebut dimusnahkan. Penggunaan repelen alami dilakukan dalam penelitian ini untuk mengusir mencit dengan memanfaatkan indera penciuman.
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