Judul: Analysis of the Leading Commodities of the Food Subsector of Gorontalo Regency
Abstrak: Laju pertumbuhan PDRB pada sektor pertanian berdasarkan harga konstan cenderung mengalami penurunan pada tahun 2018-2020. Melihat beragamnya jenis komoditas yang dikembangkan pada sektor pertanian khususnya pada subsektor pangan di Kabupaten Gorontalo, diharapkan adanya komoditas unggulan yang dengan baik dikembangkan dan dapat memberikan dampak yang baik pada pertumbuhan ekonomi Kabupaten Gorontalo khususnya pada sektor pertanian terlebih pada subsektor pangan. Tujuan penelitian ini adalah untuk mengidentifikasi komoditas basis dan nonbasis pada subsektor pangan Kabupaten Gorontalo, mengidentifikasi komoditas yang tergolong dalam pertumbuhan progresif serta menentukan komoditas unggulan pada subsektor pangan Kabupaten Gorontalo menggunakan alat analisis LQ (Location Quotient) dan SSA (Shift Share Analysis). Berdasarkan hasil analisis didapatkan komoditas basis yang paling mendominasi pada subsektor pangan Kabupaten Gorontalo adalah padi, jagung dan kedelai, Komoditas subsektor pangan di Kabupaten Gorontalo yang tergolong memiliki pertumbuhan yang progresif atau maju adalah komoditas jagung, padi dan kedelai. Komoditas unggulan di Kabupaten Gorontalo berdasarkan rekapitulasi hasil analisis LQ dan SSA adalah jagung, padi dan kedelai., The GRDP growth rate in the agricultural sector based on constant prices declines in 2018-2020. Seeing the various types of commodities developed in the agricultural sector, especially in the food subsector in Gorontalo Regency, it is hoped that there will be leading commodities that are well developed and can have a good impact on economic growth in Gorontalo Regency, especially in the agricultural sector, especially in the food subsector. The purpose of this study is to identify basic and non-basic commodities in the food subsector of Gorontalo Regency, identify commodities that are classified as progressive growth, and determine leading commodities in the food subsector of Gorontalo Regency using LQ (Location Quotient) and SSA (Shift Share Analysis) analysis tools. Based on the analysis results, it was found that the most dominating base commodities in the food subsector of Gorontalo Regency are rice, corn, and soybeans. The commodities of the food subsector in Gorontalo Regency, which are classified as having progressive or advanced growth, are corn, rice, and soybeans. The leading commodities in Gorontalo Regency based on the recapitulation of the LQ and SSA analysis results are corn, rice, and soybeans.
Keyword: Food Subsector, Leading Commodities, LQ, SSA

Judul: Analysis of the Development of Superior Food Crop Commodities at Subdistrict Level in Bogor Regency
Abstrak: Kabupaten Bogor memiliki potensi dalam pengembangan subsektor tanaman pangan yang berperan besar terhadap perekonomian dan ketahanan pangan daerah. Penurunan luas lahan pertanian menjadi masalah yang dihadapi dalam pengembangan subsektor tersebut sehingga dibutuhkan upaya untuk mengoptimalkan pemanfaatan lahan melalui pengembangan komoditas unggulan. Penelitian ini bertujuan untuk (1) Mengidentifikasi komoditas unggulan tanaman pangan pada tingkat kecamatan di Kabupaten Bogor; (2) Menganalisis tingkat spesialisasi dan lokalisasi dari komoditas unggulan tanaman pangan; (3) Menganalisis prioritas pengembangan komoditas unggulan tanaman pangan pada tingkat kecamatan; dan (4) Menganalisis upaya pengembangan komoditas unggulan tanaman pangan oleh Pemerintah Daerah Kabupaten Bogor. Metode yang digunakan dalam penelitian antara lain metode analisis deskriptif, location quotient (LQ), kuosien spesialisasi, dan kuosien lokalisasi. Hasil penelitian menunjukkan bahwa komoditas tanaman pangan dengan wilayah basis terbanyak di Kabupaten Bogor adalah padi sawah, kacang tanah, ubi kayu, ubi jalar, dan talas. Tidak ada spesialisasi dan pemusatan komoditas unggulan tanaman pangan pada tingkat kecamatan. Semua komoditas tanaman pangan menjadi komoditas yang diprioritaskan untuk dikembangkan pada tingkat kecamatan. Pemerintah Daerah Kabupaten Bogor dan dinas terkait telah melaksanakan Program Peningkatan Produksi, Produktivitas, dan Nilai Tambah Tanaman Pangan yang terdiri dari kegiatan pengelolaan produksi hingga pengolahan dan pemasaran produk hasil pertanian tanaman pangan., Bogor Regency has potential in the development of the food crop subsector, which has a major role in the regional economy and food security. The decrease in the area of agricultural land is a problem faced in the development of this subsector, so efforts are needed to optimize land use through the development of superior commodities. This study aims to (1) identify the superior commodities of food crops at the subdistrict level in Bogor Regency; (2) analyze the level of specialization and localization of superior food crop commodities; (3) analyze the priority of developing superior food crop commodities at the subdistrict level; and (4) analyze efforts to develop superior food crop commodities by the Regional Government of Bogor Regency. The methods used in this study include descriptive analysis methods, location quotient (LQ), specialization quotient, and localization quotient. The results showed that the food crop commodities with the largest base area in Bogor Regency are lowland rice, peanuts, sweet potatoes, cassava, and taro. There is no specialization and centralization of superior food crop commodities at the subdistrict level. All food crop commodities are prioritized to be developed at the subdistrict level. The Regional Government of Bogor Regency and related agencies have implemented the Program to Increase Production, Productivity, and Added Value of Food Crops, which consists of activities from production management to processing and marketing of food crop agricultural products.
Keyword: base area, centralization, location quotient, specialization, superior commodities

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: