Judul: Correlation between Agrarian Crisis and Gurandil Poverty: Cisarua Village, Nanggung District, Bogor Regency
Abstrak: Krisis agraria sering terjadi bersamaan dengan kemiskinan pada masyarakat di lingkar tambang emas. Tujuan dari penelitian ini untuk menguji hubungan antara krisis agraria dengan kemiskinan rumah tangga gurandil alias penambang ilegal di Desa Cisarua, Kecamatan Nanggung. Penelitian ini menggunakan pendekatan sequential explanatory yaitu metode pengumpulan dan analisis data kuantitatif diikuti analisis data kualitatif. Populasi penelitian ini adalah rumah tangga gurandil di Desa Cisarua, Kecamatan Nanggung. Data kuantitatif diolah dari survei 30 responden hasil purposive sampling. Hasil penelitian menunjukkan terdapat hubungan positif antara variabel krisis agraria pada aspek penguasaan agraria dan aspek jaminan rakyat dalam tata guna lahan dengan variabel kemiskinan pada aspek tingkat pendapatan. Tidak terdapat hubungan antara aspek kepastian hak dan aspek jaminan rakyat dalam hubungan produksi dan distribusi hasil dengan tingkat pendapatan. Ini disebabkan faktor kemiskinan struktural sehingga responden tidak mampu mengolah sumber agraria untuk memenuhi kebutuhan rumah tangga., Agrarian crises often occur together with poverty in communities around gold mines. The purpose of this study was to examine the relationship between the agrarian crisis and the poverty of the gurandil household, aka illegal miners, in Cisarua Village, Nanggung District. This study uses a sequential explanatory approach, namely the method of collecting and analyzing quantitative data followed by qualitative data analysis. The population of this research is the gurandil household in Cisarua Village, Nanggung District. Quantitative data was processed from a survey of 30 respondents based on purposive sampling. The results of the study show that there is a positive relationship between the agrarian crisis variable on the aspect of agrarian mastery and the aspect of people's security in land use with the poverty variable on the income level aspect. There is no relationship between aspects of certainty of rights and aspects of people's guarantees in relation to the production and distribution of results with the level of income. This is due to structural poverty factors so that respondents are unable to process agrarian resources to meet household needs.
Keyword: kemiskinan, krisis agraria, pertanian, rumah tangga gurandil, tambang emas

Judul: Dampak Aktivitas Pertambangan Emas Tanpa Izin terhadap Kesejahteran Rumah Tangga Gurandil
Abstrak: This study aimed to analyze relationship between factors which are stimulated emergence of gurandil with activities undertaken by gurandil in doing illegal gold mining, and its relationship with welfare of households, by using Spearman rank correlation test. This research was conducted using quantitative research approach, namely use of instruments such as questionnaires, and qualitative data supported by in-depth interviews, participant observation and document analysis. Results of this study explain that the factors stimulates the emergence gurandil are associated with the level of activity in the gold mining without permission. Factors that influence intensity of gurandil's activity is economic factors, because of low level of earned income to meet family needs. Another factor that affects activity of gurandil is legal factors and social factors. Gurandil activity levels are categorized according to the characteristics, namely gurandil shallow, regular gurandil, and gurandil barrel. Gurandil activity in gold mining without permission is gurandil shallow highest. Based on the obtained relationship gurandil activity by household welfare level gurandil is seen from physical condition of residential buildings, level of health, education level, income level, and level of expenditure.
Keyword: Bogor Agricultural University, level of welfare, gurandil activity, driving factors of gurandil

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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