Judul: Food Consumption, Physical Activity, Nutritional Status and Work Productivity Of Tea Pickers in Kabawetan, Kepahiang Regency, Bengkulu
Abstrak: Pandemi Covid-19 berdampak pada aktivitas masyarakat karena pembatasan sosial, begitu juga kegiatan para pekerja. Himbauan untuk tetap di rumah menyebabkan perubahan kebiasaan sehari–hari, pola makan dan tingkat aktivitas fisik (Ardella 2020). Kebutuhan gizi seharusnya dipenuhi setiap tenaga kerja untuk meningkatkan kesehatan dan mengoptimalkan produktivitas kerja (Sari dan Muniroh 2017). Penelitian ini bertujuan menganalisis konsumsi pangan, aktivitas fisik, status gizi, dan produktivitas kerja pemetik teh di PT SMM Kabawetan Kepahiang. Penelitian ini menggunakan desain Cross Sectional dan sampel 100 orang. Data karakteristik subjek dikumpulkan dengan cara wawancara, data kebiasaan konsumsi, jenis dan jumlah konsumsi pangan wawancara menggunakan kuesioner semi quantitative food frequency dan Food recall 24 jam. Data aktivitas wawancara menggunakan kuesioner recall aktivitas 24 jam. Sebagian dari contoh (57%) dewasa madya. Pendapatan per kapita ≥90% tidak miskin. Jenis pangan paling sering dikonsumsi kelompok serelia, pangan hewani, sayuran dan buah adalah beras (21 kali seminggu); telur (2-3 kali seminggu); kangkung, wortel, labu siam dan kol (1-2 kali setiap minggu); pisang dan pepaya (1-2 kali per minggu). Sebagian besar contoh memiliki status gizi normal (62%), tingkat aktivitas fisik sedang (84%). Tingkat konsumsi protein dan tingkat aktivitas fisik berkorelasi signifikan dengan status gizi (p<0,05) status gizi berkorelasi signifikan dengan produktivitas kerja (p<0,05)., The Covid-19 pandemic had an impact on community activities due to social restrictions and rules prohibiting crowds, as well as the activities of workers. The appeal for people to stay at home led to changes in daily habits, including diet and physical activity levels (Ardella 2020). Nutritional needs should be met by every workforce to improve health and optimize work productivity (Sari and Muniroh 2017). This study was aimed to analyze food consumption, physical activity of nutritional status, and work productivity of tea pickers at PT SMM Kabawetan Kepahiang Regency. The study used a Cross Sectional design and 100 tea pickers have been participated. The characteristics of the subject data is collected by in-person interviews. The food consumption data including types, amounts and food habits of were also collected by in-person interviews using semi quantitative food frequency questionnaires and 24-hour food recalls method. The 24-hours activities recall questionnaire was interviewed to collect daily activities data. The majority of examples (57%) were in intermediate adulthood. Acording to per capita income ≥90% sample was categorized not poor. The most commonly consumed food for serelia, animal food, vegetable and fruit groups were rice (21 times a week); eggs (2-3 times a week); kale, carrots, siamese pumpkin and cabbage (1-2 times each week); bananas and papayas (1-2 times per week), respectively. Most examples had normal nutritional status (62%) while the level of physical activity belonged to the moderate category (84%). Protein consumption levels and physical activity levels was correlated significantly with nutritional status (p<0.05), meanwhile nutritional status was significantly correlated with work productivity (p<0.05).
Keyword: Food Consumption, Nutritional Status, Tea Pickers, Physical Activity

Judul: Perbedaan Kebiasaan Makan dan Aktivitas Fisik Pekerja Kantor saat WFH dan WFO selama Pandemi Covid-19
Abstrak: Pandemi Covid-19 menyebabkan terbatasnya aktivitas kerja di kantor. Keadaan tersebut membuat terjadinya perubahan gaya hidup pekerja termasuk kebiasaan makan dan aktivitas fisik. Tujuan dari penelitian ini menganalisis perbedaan kebiasaan makan dan aktivitas fisik pekerja saat WFH dan WFO selama pandemi Covid-19 beserta faktor-faktor yang memengaruhinya. Pengambilan data dilakukan secara online melalui Google form. Data kebiasaan makan subjek diambil melalui kuesioner kebiasaan makan yang terdiri atas tiga belas butir pertanyaan data aktivitas fisik subjek diambil menggunakan kuesioner GPAQ. Kebiasaan frekuensi makan per hari, sarapan, konsumsi buah, sayur dan susu lebih tinggi di masa WFH (p<0,05). Kebiasaan konsumsi minuman manis, teh dan/atau kopi, fast food, dan minuman beralkohol lebih tinggi di masa WFO (p<0,05). Tingkat aktivitas fisik subjek lebih tinggi di masa WFH namun tidak berbeda secara signifikan (p>0,05). Usia, jenis kelamin, dan status gizi memiliki hubungan yang signifikan dengan beberapa kebiasaan makan saat WFH dan WFO. Pendidikan terakhir hanya memiliki hubungan yang signifikan dengan beberapa kebiasaan makan saat WFH (p<0,05). Jenis kelamin memiliki hubungan yang signifikan dengan tingkat aktivitas fisik subjek saat WFH (p<0,05)., Covid-19 pandemic led to limited work activities in the office. This situation resulted in changes in workers' lifestyles, including their dietary habits and physical activity. This study aims to analyze workers' differences in dietary habits and physical activity during work-from-home (WFH) and work-from-office (WFO) periods during Covid-19 pandemic, along with the influencing factors. Data collection was conducted online through Google form. Subjects' dietary habits were collected through 13-item questionnaire. While the subjects' physical activity was obtained using GPAQ. The frequency of daily meals, breakfast, fruit consumption, vegetable consumption, and milk consumption were higher during WFH period (p<0,05). The consumption of sweet beverages, tea or coffee, fast food, and alcoholic beverages was higher during WFO period (p<0,05). The subjects' physical activity level was higher during WFH period but not significantly different (p>0,05). Age, gender, and nutritional status were significantly associated with some dietary habits during WFH and WFO periods. The highest level of education was only significantly associated with particular eating habits during the WFH period (p<0,05). Gender was significantly associated with the subject's physical activity level during the WFH period (p<0,05).
Keyword: covid-19 pandemic, dietary habits, office workers, physical activity

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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