Judul: Keterkaitann konsumsi pangan dan status gizi dengan usia menarche anak perempuan usia sekolah dasar di Bogor
Abstrak: Tujuan penelitian ini adalah menganalisis hubungan konsumsi makanan dan status gizi dengan usia menarche pada anak sekolah dasar di Kota Bogor. Penelitian menggunakan desain cross sectional study, dilakukan pada bulan September sampai November 2011 di enam sekolah dasar di Bogor. Sampel dipilih secara purposif sehingga diperoleh 58 siswa. Data dianalisis menggunakan uji rank spearman. Hasil penelitian menunjukkan rata-rata usia menarche adalah 10,74± 0,71. Lebih dari separuh (62,1%) siswa mengalami menarche pada usia ≥ 10 tahun. Usia menarche berhubungan negatif signifikan dengan konsumsi zat besi tetapi tidak berhubungan dengan status gizi, usia ibu menarche, jumlah anggota keluarga, pengetahuan gizi anak, latar belakang pendidikan ayah, dan pendapatan rumah tangga. Penelitian ini menyarankan agar orang tua lebih memberikan informasi dan dukungan mengenai aspek-aspek yang berkaitan dengan pubertas.
Keyword: Food consumption, Nutritional status, Menarche, Elementary school, Puberty

Judul: Studi konsumsi pangan hewani dan waktu pubertas pada siswi sekolah dasar di Bogor
Abstrak: Currently the consumption of animal food of Indonesia's population is still low, which only reached 6.6 kg/capita/year (Hanani 2009). Consumption of livestock products of Indonesians in 2008 (BPS 2010b) was 4.8 kg/capita/year for meat, 17.42 kg/capita/year for eggs, and 0.28 kg/capita/year for milk. This study aims to determine the frequency of consumption of animal food among female elementary school students in the City of Bogor and its association to menarche time of puberty.The design used was cross-sectional study. The total sample consisted of 38 female students who were menstruating and 38 female students who have not been menstruating. Most of the samples (84.21%) experienced first menstruation at age 9-11 years.The most common animal food consumption of menstruating students was milk with an average of 9.8 ± 7.0 times/week. Chicken and milk were often consumed by students of this group with a percentage of 97.4%. Whereas the most common animal food consumption of non-menstruating students was also milk with an average frequency of consumption 13.3 ± 8.4 times/week. Eggs were most often consumed by students of this group with the percentage of 100%. There was a significant association between the frequency of milk consumption with the amount of pocket money of students who are menstruating (p=0.037). Demonstrated a significant association between knowledge of nutrition with a frequency of egg consumption (p=0.010) in students who have periods while students who have not menstruation showed no association between these variables. There was an apparent association between the FFQ sausage meat with the age at first menstruation (p=0.022). There was no significant association between age at first menstruation with nutritional status (height for age, p=0.788 and BMI for age, p=0.060) and consumption of nutrients (energy, p=0.993 and protein, p=0.889) and the rate of nutrient adequacy (energy, p=0.905 and protein, p=0.847). In the group of students who have menstrual periods there was no significant association between nutritional status with sufficient levels of nutrition (p>0.05).
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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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