Judul: The Relationship between Nutritional Status  and the ARI Incidence of Toddlers in the Work Area of the Unyur Serang Health  Center before and during the Covid-19 Pandemic
Abstrak: Prevalensi infeksi saluran pernapasan akut (ISPA) hasil Riskesdas 2018 di Kota Serang (13,18%), menduduki peringkat ketiga tertinggi di Provinsi Banten. Status gizi merupakan salah satu indikator keberhasilan upaya peningkatan kesehatan balita. Pandemi covid-19 mengakibatkan pembatasan kegiatan sementara pelayan di posyandu seperti monitoring berat badan dan imunisasi, serta menurunnya daya beli masyarakat terhadap pangan bergizi. Makanan bergizi dapat meningkatkan kekebalan tubuh dan mencegah penyakit infeksi, salah satunya ISPA. Penelitian ini bertujuan menganalisis hubungan status gizi balita dengan kejadian ISPA pada balita di wilayah kerja Puskesmas Unyur Serang sebelum dan selama pandemi covid-19. Desain penelitian adalah komparatif cross sectional menggunakan data sekunder register Manajemen Terpadu Balita Sakit (MTBS) puskesmas tahun 2019-2020. Penelitian ini menganalisis data balita yang diperoleh dengan systematic sampling. Data yang dianalisis adalah karakteristik balita, status imunisasi, status gizi dan kejadian ispa pada balita. Hasil uji korelasi Spearman menunjukkan tidak ada hubungan antara karakteristik, status imunisasi dan status gizi (p>0,05) dengan kejadian ISPA dan derajat keparahannya pada balita sebelum dan selama pandemi covid-19. Kata kunci: derajat keparahan, kejadian ispa, pandemi covid-19, status gizi, status imunisasi, The Relationship between Nutritional Status and the ARI Incidence of Toddlers in the Work Area of the Unyur Serang Health Center before and during the Covid-19 Pandemic. Supervised by CESILIA METI DWIRIANI. The prevalence of acute respiratory infections (ARI) as a result of the 2018 Riskesdas in Serang City (13.18%), was ranked the third highest in Banten Province. Nutritional status is one indicator of the success of efforts to improve the health of children under five. The COVID-19 pandemic resulted in the temporary restriction of activities in posyandu such as weight monitoring and immunization, as well as a decrease in people's purchasing power towards nutritious food. Nutritious food can increase immunity and prevent infectious diseases, one of which is ARI. This study aims to analyze the relationship between the nutritional status of toddlers and the incidence of ARI in toddlers in the work area of the Unyur Serang Health Center before and during the COVID-19 pandemic. The research design is a cross-sectional comparative using secondary data from the Integrated Management of Childhood Illness (IMCI) at the health center in 2019-2020. The study analyzes toddler’s data obtained by systematic sampling. The data analyzed were toddler characteristics, immunization status, nutritional status, and ARI incident of toddlers. Spearman's correlation test results showed no association between characteristics, immunization status and nutritional status (p>0.05) and the incidence of ARI and its severity in toddlers before and during the covid-19 pandemic. Keywords: ARI incidence, covid-19 pandemic, immunization status, nutritional status, severity
Keyword: ARI incidence, covid-19 pandemic, immunization status, nutritional  status, severity

Judul: Hubungan Kunjungan Posyandu dengan Pengetahuan Gizi dan Kesehatan Ibu serta Status Gizi Balita di Masa Pandemi Covid-19
Abstrak: Posyandu merupakan salah satu bentuk pelayanan kesehatan masyarakat yang terdampak oleh COVID‐19. Pembatasan kegiatan posyandu menjadikan para ibu balita untuk berusaha lebih optimal untuk memantau tumbuh kembang balitanya. Tujuan penelitian ini adalah untuk menganalisis hubungan kunjungan posyandu, pengetahuan gizi ibu, dan tingkat kecukupan asupan dengan status gizi balita dimasa pandemi COVID-19. Desain penelitian ini adalah cross sectional study dengan subjek berjumlah 88 balita. Pengumpulan data karakteristik ibu dan keluarga, balita, kunjungan posyandu, pengetahuan gizi dan status gizi balita dengan menggunakan kuesioner, wawancara dan pengukuran langsung. Data asupan gizi dikumpulkan dengan food recall 2x24 jam. Hasil penelitian menunjukkan tidak ada hubungan antara kunjungan posyandu dengan pengetahuan gizi ibu dan status gizi balita (BB/U, TB/U, dan BB/TB). Tidak ada hubungan pengetahuan gizi ibu dengan tingkat kecukupan energi dan status gizi balita (BB/U dan TB/U). Namun terdapat hubungan pengetahuan gizi ibu dengan status gizi balita (BB/TB) (p=0,044 r=0,215). Kata kunci : asupan, BB/TB, food recall, pendidikan, Posyandu is a kind of health service for mothers and toddlers who are affected by the COVID-19 pandemic. Restrictions on posyandu activities make the mothers of toddlers more optimally monitor their toddler’s growth and development. The purpose of this study was to analyze the correlation between posyandu visits, mother's nutritional knowledge, and the level of adequacy intake during the COVID-19 pandemic with the nutritional status of children under five. This research use a cross-sectional design study with 88 children under five as a subject. The data collected are characteristics of mothers, characteristics of familly, characteristics of toddlers, posyandu visits, levels of mother’s knowledge and nutritional status of toddlers, which is the data used questionnaire, interview and direct measurement methods. Intake data obtained from food recall 2[]x24 hours. The results showed that there was no correlation between posyandu visits with mother’s nutrition knowledge and nutritional status of children under five both WAZ, HAZ, and WHZ. There is no correlation between mother’s nutrition knowledge with the level of energy adequacy and nutritional status of children under five both WAZ and HAZ. Knowledge level is related to nutritional status of WHZ (p=0.044 r=0.215) Keywords: intake, WHZ, food recall, education
Keyword: POSYANDU VISITS, NUTRITIONAL STATUS, CHILDREN UNDER FIVE

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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