Judul: Tipologi Sistem Budidaya Pertanian dan Keberlanjutan Ketersediaan Pangan pada Masyarakat Adat Kasepuhan Ciptagelar, Kabupaten Sukabumi, Provinsi Jawa Barat
Abstrak: Kasepuhan Ciptagelar adalah salah satu permukiman masyarakat tradisional di Kabupaten Sukabumi, Jawa Barat yang masih mempertahankan warisan budaya tradisional dan sistem pertanian. Kasepuhan dianggap memiliki sistem ketahanan pangan yang baik sehingga menarik untuk dipelajari lebih dalam. Tujuan dari penelitian ini adalah untuk menggambarkan kearifan lokal dalam sistem pertanian masyarakat Kasepuhan Ciptagelar, menganalisis aspek sosial, ekonomi, dan ketersediaan makanan rumah tangga dari komunitas Kasepuhan Ciptagelar dan menganalisis daya dukung masyarakat petani Kasepuhan Ciptagelar. Metode penelitian dilakukan dengan cara wawancara, diskusi dan observasi lapangan pada 52 responden. Hasil penelitian menunjukkan bahwa kearifan lokal budidaya pertanian di Kasepuhan Ciptagelar tentang ketersediaan pangan dilihat dari kepatuhan terhadap tradisi leluhur atau melaksanakan ajaran parali karuhun. Budidaya pertanian yang dilakukan yaitu beras basah dan huma. Berdasarkan pendapatan beras rata-rata rumah tangga petani responden, kisarannya adalah 0-250 ikatan, 31 KK, 251-500 ikatan, 16 KK dan kisarannya adalah 501-750 bundel, 5 KK. Produksi gabah tanpa giling dari 52 responden mencapai 13.358 tandan atau pocong yang terdiri dari 12.660 tandan dan 698 tandan (1 kg setara dengan 4 kg). Luas panen adalah 48.115, jumlah penduduk 186, kebutuhan fisik minimum 124,80 dan rata-rata produksi lahan per hektar adalah 694,07. Daya dukung lahan pertanian adalah 1,44. Menunjukkan kepada masyarakat Kasepuhan Ciptagelar mampu swasembada pangan.
Keyword: daya dukung lahan, Kasepuhan Ciptagelar, kearifan lokal, ketahanan pangan., daya dukung lahan, Kasepuhan Ciptagelar, kearifan lokal, ketahanan pangan

Judul: Kualitas Konsumsi dan Ketahanan Pangan Serta Food Coping Strategy pada Masyarakat Adat Kasepuhan Ciptagelar
Abstrak: Kasepuhan Ciptagelar is administratively located in Sirna Resmi Village, a part of Cisolok District, Sukabumi Regency. The aims of this research are to analyze household food variety consumption, household food security, and food coping strategy of Kasepuhan Ciptagelar society. Food variety consumption was measured by Household Dietary Diversity Score (HDDS). Food security was measured by cross tabulation between energy consumption per capita per day and proportion of food expenditure. As many as 13.8% household had low dietary diversity score, 40.6% medium dietary diversity score, and 46.8% high dietary diversity score. As many as of 56.9% household were secured, 9.2% were less food, 26.2% were in the stage of vulnerable, and 7.7% were insecured. Food coping strategy of the people occured only in the first and second stage.
Keyword: HDDS,, food security, food expenditure, food coping strategy

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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