Judul: The Influence of Mother-Child Attachment and Father Involvement on Cognitive Development of Stunted and Non-Stunted Toddlers
Abstrak: Prevalensi stunting di Indonesia tahun 2022 berdasarkan standar WHO masih terkategori sebagai masalah gizi kronis. Penelitian ini secara umum bertujuan untuk menganalisis pengaruh kelekatan ibu-anak dan keterlibatan ayah terhadap perkembangan kognitif batita. Desain penelitian yang digunakan yaitu eksplanatori dengan metode survei. Penelitian ini melibatkan 36 batita stunting dan 36 batita tidak stunting berusia 2-3 tahun beserta ibunya yang berdomisili di Kelurahan Bubulak dan Kelurahan Sindangbarang, Kota Bogor yang dipilih secara purposive. Hasil penelitian menunjukkan jenis kelamin, usia anak, dan pendapatan keluarga berhubungan positif signifikan dengan perkembangan kognitif, usia ibu berhubungan negatif signifikan dengan kelekatan ibu-anak, serta pendidikan dan status pekerjaan ibu berhubungan positif signifikan dengan keterlibatan ayah. Keterlibatan ayah berpengaruh positif signifikan terhadap perkembangan kognitif, sedangkan kelekatan ibu-anak tidak berpengaruh terhadap perkembangan kognitif anak.
Keyword: cognitive development, father involvement, mother and child attachment, stunting, toddlers

Judul: Hubungan Pengetahuan Gizi dan Kesehatan Ibu serta Kebiasaan Makan dengan Perkembangan Kognitif Balita Stunting dan Normal
Abstrak: Prevalence of stunting in Indonesia is extremely high, which can result in impaired development i.e cognitive development. The objective of this study was to analyze the relationship of mother's nutrition and health knowledge as well as eating habits with cognitive development of stunting and normal underfive children. Samples were 82 underfive children selected purposively, consisted of 41 stunting underfive children and 41 normal underfive children. Most of stunting underfive children were female aged 3.6-4.5 years. Result showed mother's nutrition and health knowledge, eating habits and cognitive development of normal underfive children were better than stunting underfive children. Eating habits and cognitive development of stunting and normal underfive children had significant difference (p<0.05). Correlation test showed that diversity of vegetables had a positive correlation with cognitive development, but frequency and diversity of snack had negative correlation with cognitive development.
Keyword: stunting, cognitive development, eating habits, mother's nutrition and health knowledge

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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