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 Subsector Potential of Food Crops Sub-sector in Fulfilling Food Needs in East Java Province
Abstrak: Subsektor tanaman pangan menjadi subsektor andalan dalam pembentukan PDRB sektor pertanian di Provinsi Jawa Timur yang selama tiga tahun terakhir kontribusinya menurun. Subsektor ini memiliki tantangan yang berat dalam perannya mencukupi kebutuhan pangan serta mempertahankan pertumbuhan dan daya saingnya terhadap subsektor lain. Penelitian ini bertujuan untuk : 1) menganalisis potensi subsektor tanaman pangan sebagai basis (unggulan) di Provinsi Jawa Timur, 2) menganalisis kinerja subsektor tanaman pangan di Provinsi Jawa Timur dan 3) menganalisis proyeksi produksi dan konsumsi beras di Provinsi Jawa Timur di masa mendatang. Metode yang digunakan dalam penelitian ini adalah analisis Location Quotient (LQ), analisis shift share dan analisis ARIMA. Hasil penelitian menunjukkan bahwa : 1) subsektor tanaman pangan termasuk subsektor basis (unggulan) bersama dua subsektor lainnya yakni subsektor peternakan dan perikanan, 2) subsektor tanaman pangan memiliki pertumbuhan lambat dengan daya saing kurang baik dibandingkan subsektor yang sama ditingkat nasional, dan 3) proyeksi lahan sawah diprediksi mengalami penurunan selama tahun 2023-2024. Penurunan ini akan menyebabkan roduksi dan ketersediaan beras di Provinsi Jawa Timur berkurang sampai tahun 2024 meskipun kondisinya tetap surplus., The food crops sub-sector has become the mainstay sub-sector in the formation of the agricultural sector GDRP in East Java Province which its contribution is decreasing last three year. This sub-sector has a formidable challenge in meeting the food needs and maintaining its growth and competitiveness against other sub-sector. This study aims to: 1) analyze the potential of the food crop sub-sector as the basis (primary) in East Java Province, 2) analyze the performance of the food crops sub-sector in East Java Province and 3) analyze the projection of rice production and consumption in East Java Province in the future. Furthermore, the method used in this study was Location Quotient (LQ) analysis, shift-share analysis and ARIMA analysis. The results shows that: 1) the food crops sub-sector is included in the basis (primary) sub-sector along with two other sub-sectors, which are the livestock and fishery sub-sector, 2) the food crops sub-sector has slow growth with less competitiveness than the same sub-sector at the national level, and 3) the projected demand for rice fields area is predicted to decrease in 2023-2024. the decrease will cause in reduced rice production and availability until 2024 although the condition remains in surplus.
Keyword: Location Quotient, Shift share, Base (primary), Rice, Projection

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: