Judul: Dampak Sosial dan Ekonomi Pandemi Covid-19 pada Masyarakat Desa Sekitar Hutan KPH Purwakarta (Kasus: Desa Kutamanah).
Abstrak: Munculnya situasi pandemi yang datang secara tiba-tiba akibat virus Covid-19 memberikan dampak dalam aspek sosial dan ekonomi bukan hanya pada skala makro tetapi juga pada skala mikro. Penularan virus Covid-19 yang sangat cepat melalui udara, air dan sentuhan serta adanya mobilitas yang terjadi pada masyarakat dari kota ke desa dan sebaliknya membuat dampak pandemi Covid-19 tidak hanya terjadi di kota akan tetapi juga di pedesaan Desa Kutamanah termasuk salah satu desa di sekitar kawasan hutan KPH Purwakarta yang terkena dampak dari pandemi Covid-19 khususnya dampak sosial dan ekonomi. Tujuan penelitian ini adalah untuk mengidentifikasi dampak sosial dan ekonomi masyarakat Desa Kutamanah akibat pandemi Covid-19. Dampak sosial diidentifikasi melalui indikator tingkat kerjasama, sikap individu dan menjaga kebersihan dan kesehatan. Dampak ekonomi diidentifikasi melalui indikator perubahan mata pencaharian dan perubahan pendapatan. Hasil penelitian menunjukan bahwa dampak sosial terjadi pada indikator menjaga kebersihan dan kesehatan serta sikap individu. Dampak ekonomi terjadi pada indikator perubahan pendapatan karena berbagai faktor, seperti rusaknya jalan dan tidak adanya kunjungan wisata ke Desa Kutamanah.
Keyword: covid-19, dampak, ekonomi, Kutamanah, sosial

Judul: The COVID-19 Impact on Changes of Livelihood Strategies and Gender Roles in Tourism Village Business Actors Household
Abstrak: Perubahan Strategi Penghidupan dan Peran Gender Rumah Tangga Pengelola Desa Wisata pada Masa Pandemi COVID-19. Di bawah bimbingan EKAWATI SRI WAHYUNI. Pandemi global COVID-19 memberikan dampak negatif pada segi kesehatan, sosial, dan ekonomi. Salah satu sektor yang terdampak adalah sektor pariwisata seperti desa wisata yang sedang menjamur di Indonesia. Penelitian ini menggunakan metode campuran kualitatif dan kuantitatif dalam menjelaskan dampak pandemi terhadap sektor bisnis pariwisata di desa wisata dan menganalisis perubahan strategi nafkah dan peran gender yang dialami rumah tangga pengelola desa wisata. Data diperoleh dengan wawancara mendalam kepada 10 informan dan kuesioner kepada 37 rumah tangga pengelola Desa Wisata Nglanggeran. Hasil penelitian menunjukkan bahwa pandemi COVID-19 menyebabkan penurunan wisatawan dan omset desa wisata. Terjadi perubahan pendapatan, modal sosial, strategi nafkah, dan peran gender. Rumah tangga pun mengalami penurunan pendapatan dan melakukan perubahan strategi nafkah yaitu dengan mencari pekerjaan lain ketika pekerjaan wisatanya terpaksa berhenti. Perubahan peran gender juga terjadi pada beberapa rumah tangga karena bertambahnya waktu di rumah dan tertutupnya beberapa usaha wisata yang dijalani oleh rumah tangga desa wisata ketika pandemi. Kata kunci: desa wisata, pandemi COVID-19, peran gender, strategi penghidupan., The COVID-19 Impact on Changes of Livelihood Strategies and Gender Roles in Tourism Village Business Actors Households. Supervised by EKAWATI SRI WAHYUNI. The global pandemic COVID-19 has a negative impact on health, social, and economic aspects. One of the affected sectors is the tourism sector such as tourism villages. This study uses mixed methods that obtain a quantitative and qualitative method in explaining the impact of pandemics on the tourism business sector in tourist villages and analyzing changes in the livelihood strategy and gender roles experienced by tourist village manager households. The data was obtained by in-depth interviews with 10 informants and questionnaires to 37 business households in Nglanggeran Tourism Village. The results showed that the COVID-19 pandemic caused a decrease in tourists and the turnover of tourist villages. There have been changes in household income, ownership of social capital, livelihood strategy, and gender roles. Households also experience a decrease in income and change their livelihood strategy by finding another occupation when their tourist occupation is forced to stop. Gender roles changes also occur in some households due to increased time at home and the closure of some tourism businesses undertaken by tourist village management households during the pandemic. Keywords: COVID-19 pandemic, gender roles, livelihood strategies, tourism village.
Keyword: COVID-19 Pandemic, gender roles, livelihood strategy, tourism village

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.
Keyword: