Judul: The Relationship between Nutritional Status and Work Productivity of Coal Mining Employees of PT. Kaltim Prima Coal
Abstrak: Produktivitas kerja merupakan kemampuan seseorang atau kelompok orang untuk menghasilkan barang atau jasa. Status gizi merupakan salah satu aspek kesehatan yang penting dalam produktivitas kerja. Tujuan dari penelitian ini adalah menganalisis hubungan status gizi dengan produktivitas kerja karyawan PT. Kaltim Prima Coal. Desain penelitian adalah cross sectional dan melibatkan 95 subjek. Pengumpulan data dilakukan menggunakan google form dan wawancara melalui telepon. Subjek berusia 26–55 tahun dengan sebagian besar (63%) memiliki status gizi baik. Tingkat aktivitas fisik subjek rata-rata tergolong ringan pada weekday (54%) dan weekend (40%). Tingkat kecukupan energi dan zat gizi subjek masih tergolong kurang untuk weekday maupun weekend. Analisis perbedaan tingkat kecukupan gizi karyawan menunjukkan bahwa tidak terdapat perbedaan yang signifikan antara saat weekday maupun weekend (p>0,05). Tingkat aktivitas fisik subjek menunjukkan terdapat perbedaan pada weekday maupun weekend khususnya untuk tingkat aktivitas fisik berat (p<0,05). Hasil uji korelasi menunjukkan bahwa tidak terdapat hubungan yang signifikan antara aktivitas fisik dengan status gizi (p>0,05) dan juga tidak terdapat hubungan yang signifikan antara status gizi dengan produktivitas kerja (p>0,05)., Work productivity is the ability of a person or group of people to produce goods or services. Nutritional status is an important aspect of health in work productivity. The purpose of this study was to analyze the relationship between nutritional status and work productivity employees of PT. Kaltim Prima Coal. The research design was cross sectional and involved 95 subjects. Data collection was carried out using google forms and telephone interviews. Subjects aged 26–55 years with most (63%) had good nutritional status. The average subject's level of physical activity is relatively light on weekdays (54%) and weekends (40%). The level of energy and nutrient adequacy of the subject is still relatively low on weekdays and weekends. Analysis of differences in employee nutritional adequacy levels showed that there was no significant difference between weekdays and weekends (p>0.05). The level of physical activity of the subjects showed that there were differences on weekdays and weekends, especially for the level of heavy physical activity (p<0.05). The results of the correlation test showed that there was no significant relationship between physical activity and nutritional status (p>0.05) and there was also no significant relationship between nutritional status and work productivity (p>0.05).
Keyword: Eating habits, Employees, Nutritional status, Physical activity, Work productivity

Judul: Relationship between Nutritional Adequacy Level, Nutritional Status, and Stress Level on Work Capacity of Women Employee
Abstrak: Penelitian ini bertujuan mempelajari dan menganalisis hubungan antara tingkat kecukupan energi dan zat gizi, tingkat stress, dan status gizi terhadap kapasitas kerja pada pekerja wanita. Desain penelitian ini adalah studi cross sectional dengan jumlah subjek sebanyak 41 pekerja wanita CV. Amanda Brownies Jawa Barat. Penelitian dilakukan pada pertengahan bulan Agustus 2022– pertengahan bulan September 2022 Pengumpulan data dilakukan tatap muka dengan metode wawancara dan pengisian kuesioner. Sebagian besar subjek memiliki tingkat kecukupan energi dan zat gizi defisit. Sebagian besar subjek memiliki status gizi normal (80,5%). Sebagian besar subjek tidak mengalami stress atau termasuk kategori normal (61%). analisis menunjukkan bahwa terdapat hubungan yang signifikan antara usia dengan kapasitas kerja (p=0,001, r=-0,591), lama kerja dengan kapasitas kerja (p=0,000, r=0,917), dan hubungan yang signifikan antara pendapatan dengan kapasitas kerja (p=0,015, r=0,376). Adanya perbedaan yang signifikan antara status pekerja tetap dan kontrak Sig. (2 tailed) 0,000. Tidak ada hubungan yang signifikan tingkat kecukupan energi dan zat gizi makro serta mikro (Vitamin C dan Fe) (p>0,05). Begitupula dengan variabel tingkat stres dengan kapasitas kerja dan status gizi dengan kapasitas kerja (p>0,05) yang juga menunjukkan tidak adanya hubungan yang signifikan., This study aims to study and analyze the relationship between nutritional adequacy, stress level, and nutritional status on the work capacity of female workers. The design of this research is a cross sectional study with the number of subjects as many as 41 female workers CV. Amanda Brownies West Java. The study was conducted in mid-August 2022–mid-September 2022. Data collection was carried out offline by interviewing and filling out questionnaires. Most of the subjects had a deficit nutritional adequacy level. Most of the subjects had normal nutritional status (80.5%). Most of the subjects did not experience stress or were included in the normal category (61%). The analysis shows that there is a significant correlation between age and work capacity (p=0.001, r=-0.591), length of work and work capacity (p=0.000, r=0.917), and a significant correlation between income and work capacity (p=0.015, r=0.376). There is a significant difference between the status of permanent and contract workers Sig. (2 tailed) 0.000. There was no v v vi significant correlation between energy adequacy levels and macro and micro nutrients (Vitamin C and Fe) (p>0.05). Likewise, the variable stress level with work capacity and nutritional status with work capacity (p> 0.05) which also shows no significant correlation.
Keyword: female workers, nutritional adequacy level, nutritional status, stress level, work capacity

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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