Judul: Ecological Study of Vitamin A Coverage among Toddlers in Indonesia
Abstrak: Vitamin A memiliki peran penting dalam mendukung kesehatan dan perkembangan anak sehingga dapat mencegah terjadinya kekurangan mikronutrien yang termasuk dalam masalah triple burden malnutrisi yang berdampak kepada stunting. Kekurangan vitamin A banyak terjadi pada balita yang dapat menyebabkan kebutaan serta menurunkan daya tahan tubuh sehingga meningkatkan risiko balita terserang penyakit infeksi dan berujung kematian. Langkah pemerintah Indonesia untuk menanggulangi kekurangan vitamin A yaitu dengan memberikan suplementasi kapsul vitamin A pada bulan Februari dan Agustus. Penilitian ini bertujuan untuk menganalisis hubungan kepemilikan buku KIA, balita mendapat imunisasi lengkap, kab/kota dengan minimal 80% posyandu aktif, akses internet penduduk, ketersediaan fasilitas pelayanan kesehatan, dan ketersediaan tenaga kesehatan dengan cakupan vitamin A pada balita di Indonesia tahun 2022. Desain penelitian ini menggunakan studi ekologi dengan data sekunder. Hasil uji korelasi menunjukkan bahwa hubungan signifikan antara balita mendapat imunisasi lengkap, ketersediaan fasilitas pelayanan kesehatan, dan ketersediaan tenaga kesehatan dengan cakupan vitamin A pada balita (p = 0,016 ; 0,001, 0,001 <0,05) dengan arah korelasi positif. Tidak terdapat hubungan signifikan antara kepemilikan buku KIA, kab/kota dengan minimal 80% posyandu aktif, dan akses internet penduduk dengan cakupan vitamin A pada balita (p = 0,150 ; 0,435, 0,417 >0,05)., Vitamin A plays an important role in supporting the health and development of children, thereby preventing micronutrient deficiencies which are part of the triple burden of malnutrition leading to stunting. Vitamin A deficiency is common among toddlers and can cause blindness, reduce immunity, increase the risk of infectious diseases, and result in death. The Indonesian government's step to address vitamin A deficiency is by providing vitamin A capsule supplementation in February and August. This study aims to analyze the relationship between the ownership of KIA books, toddlers receiving complete immunization, districts/cities with at least 80% active posyandus (integrated health service posts), internet access for the population, availability of health service facilities, and availability of health workers with vitamin A coverage among toddlers in Indonesia in 2022. The study design used an ecological study with secondary data. The correlation test results showed a significant relationship between toddlers receiving complete immunization, the availability of health service facilities, and the availability of health workers with vitamin A coverage among toddlers (p = 0.016; 0.001, 0.001 <0.05) with a positive correlation direction. Meanwhile, there was no significant relationship between owning an KIA book, districts/cities with at least 80% active posyandus, and internet access for the population with vitamin A coverage among toddlers (p = 0.150; 0.435, 0.417 > 0.05).
Keyword: Balita, Fasilitas Pelayanan Kesehatan, Imunisasi, Tenaga Kesehatan, Vitamin A

Judul: Keterkaitan Kecukupan Vitamin A Ibu, Praktek Pemberian Air Susu Ibu dan Kelengkapan Imunisasi Dasar dengan Morbiditas Bayi
Abstrak: Vitamin A has an important role for health to keep normal function of immune system. Therefore, insufficiency of vitamin A on lactating women is associated with infant morbidity. The study was aimed to analyze correlation of maternal sufficiency of vitamin A, exclusive breastfeeding practices and immunization completeness with infant morbidity. This cross sectional study was conducted in four village at Gurah Subdistrict, Kediri District with 31 samples were included. The data of maternal’s food consumption, exclusive breastfeeding practices, immunization completeness and infant morbidity were collected by interview and data of nutritional status was collected by measurement of body weight and lenght. Maternal sufficiency of vitamin A were 58% sufficient and 42% insufficient. There was 68% of infants suffered of diseases, i.e. respiratory disease, fever, diarrhea. Higher maternal vitamin A sufficiency tend to corellate with shorter period of infant’s illnesses. Meanwhiele, exclusive breastfeeding practices tend corellate with with shorter period and lower frequency of illnesses of infant.
Keyword: vitamin A., infectious disease, morbidity, lactating woman, infant

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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