Judul: Kajian Mengenai Berbagai Metode Penilaian Keragaman Konsumsi Pangan Rumah Tangga
Abstrak: Household dietary diversity can be measured using Desirable Dietary Pattern (DDP), Household Dietary Diversity Score (HDDS), and modified HDDS. The general objective of this research is to compare several methods for assessing household dietary diversity. The specific objectives of this research were to identify characteristics of households, household food expenditure, and household dietary diversity; analyze correlation between household food expenditure and characteristics of households; and analyze correlation between household food expenditure and household dietary diversity based on DDP, HDDS, and modified HDDS. This research was cross-sectional study and used 118 households in Citayam and Babakan Village. This research was a part of research project “Validation of Modified HDDS (Household Dietary Diversity Score) for Recipient Household of Food Diversification Program in Bogor District” that was leaded by Dr Ir Yayuk Farida Baliwati, MS. Almost households in Citayam and Babakan Village was categorized as small household (59.32%). Fathers and mothers had low education level (36.44%, 44.92%). Fathers and mothers were categorized as middle adult (58.48%, 64.41%). Almost fathers worked as trader (25.42%) while mothers worked as housewife (73.73%). Almost households had high food expenditure level (50.85%). Household dietary diversity was high based on HDDS (95.76%) and modified HDDS (81.35%) but very low based on DDP (50.85%). Spearman correlation test showed that there were positive correlation between household food expenditure with education level of fathers (p=0.022 r=0.210), mothers (p=0.010 r=0.236), and total household members (p=0.003 r=0.275). Household food expenditure had positive correlation with household dietary diversity based on DDP (p=0.006 r=0.250) and HDDS (p=0.008 r=0.242). But household food expenditure didn’t correlate with household dietary diversity based on modified HDDS. Variation of dietary diversity based on DDP just could be determined by food expenditure about 3.9% (p=0.018 r2=0.039) but variation of dietary diversity based on HDDS could not be determined by food expenditure (p=0.061 r2=0.022). So, there was no recommendation method for assessing household dietary diversity.
Keyword: Bogor Agricultural University, DDP, dietary diversity, dietary diversity, food expenditure, HDDS, modified HDDS

Judul: Analisis Keragaman Konsumsi Pangan Rumah Tangga Penerima Program Diversifikasi Pangan di Kabupaten Bogor
Abstrak: Metode sederhana dalam penilaian keragaman konsumsi pangan rumah tangga adalah Household Dietary Diversity Score (HDDS). Penelitian ini bertujuan untuk menganalisis keragaman konsumsi pangan rumah tangga penerima program diversifikasi pangan di Kabupaten Bogor. Desain penelitian yang digunakan adalah cross-sectional, penelitian ini menggunakan sebagian data baseline penelitian “Validasi Metode HDDS Modifikasi pada Rumah Tangga Penerima Program Diversifikasi Pangan di Kabupaten Bogor” (Baliwati et al. 2014). Subjek penelitian berjumlah 60 rumah tangga yang berada di Desa Citayam dan Babakan. Hasil analisis korelasi menunjukan bahwa HDDS berhubungan signifikan dengan pendidikan kepala rumah tangga (p<0.01), pendidikan istri (p<0.05), usia istri (p<0.05) dan pengetahuan gizi istri (p<0.05).
Keyword: HDDS, karakteristik sosial ekonomi, keragaman konsumsi pangan, rumah tangga

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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