Judul: Analisis Iklim dan Dinamika Populasi Hama Chilo sacchariphagus di Perkebunan Cinta Manis Menggunakan Model Simulasi DYMEX 3.0.
Abstrak: Chilo sacchariphagus dikenal dengan nama hama penggerek batang tebu bergaris adalah salah satu hama utama yang paling banyak menyerang tanaman tebu di Perkebunan Cinta Manis. Salah satu faktor yang mempengaruhi keberadaan hama adalah faktor iklim, yaitu curah hujan, suhu minimum dan maksimum, RH maksimum dan minimum. Tujuan penelitian ini adalah menganalisis pengaruh iklim terhadap dinamika populasi Chilo sacchariphagus di Perkebunan Cinta Manis. Model siklus hidup serta pendugaan populasi hama memanfaatkan model simulasi DYMEX 3.0. Simulasi dilakukan selama lima tahun tanam pada 2008 - 2013. Hasil simulasi model memberikan prediksi cukup baik dengan nilai koefisien determinasi (R2) hasil validasi antara populasi model hasil luaran DYMEX dan populasi hasil observasi cukup tinggi namun menurun pada tahun – tahun setelah kalibrasi. Model memprediksi puncak populasi hama pada tahun tanam 2015 – 2016 terjadi pada bulan Februari 2016.
Keyword: penggerek batang, simulasi, suhu, Sumatera Selatan, tebu

Judul: Analisis Iklim dan Dinamika Populasi Hama Penggerek Batang Padi Kuning di Indramayu dengan Menggunakan Model Simulasi Dymex 3.0
Abstrak: Scirpophaga incertulas known as the Yellow rice stem borer (PBK) is one of the most attacking pests of rice plants in Indramayu region. One of the factors that influence the presence of this pest is the climatic factor, that were rainfall, maximum and minimum temperature, maximum and minimum Relative humadity. The purpose of this study was to analyze the influence of climate on the population dynamics of Yellow rice stem borer in the district of Indramayu. Life cycle model and estimation of pest populations using simulation models Dymex 3.0. Simulations were performed for four years from 2009-2012. Results of simulation models have been able to give a fairly good prediction. Model simulations also indicate that the pest population peaks occurred in the dry months with low rainfall intensity and pest population decreases as a result of high rainfall washed away by rain. This is also supported by the value of the coefficient of determination (R2) between the validation results of outcomes population of model Dymex and observations by 64%. Different climatic influences on the development and the presence of pests PBK. Temperature and rainfall are the most important factor in the progression and mortality of pest PBK
Keyword: Climate, Dymex, Scirpophaga incertulas

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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