Judul: Analisis Daya Saing, Dinamika, dan Dampak Pengetatan Kebijakan Lingkungan terhadap Ekspor Environmental Goods Indonesia
Abstrak: Negara-negara anggota OECD dan BRICS mendominasi dalam ekspor produk Core CLEG Indonesia. Namun, pengetatan kebijakan lingkungan menjadi tantangan ekspor produk Core CLEG Indonesia. Penelitian ini bertujuan untuk menganalisis daya saing, dinamika, dan dampak pengetatan kebijakan lingkungan terhadap produk Core CLEG Indonesia ke 13 negara mitra dagang anggota OECD dan BRICS. Metode penelitian ini yaitu RCA, EPD, X-Model, dan regresi data panel. Hasil RCA menunjukkan produk Core CLEG Indonesia belum memiliki daya saing komparatif yang kuat. Hasil EPD menggambarkan posisi pasar rising star. Hasil X-Model menunjukkan pengembangan pasar optimis dan potensial. Hasil regresi data panel menunjukkan GDP riil negara mitra dagang, indeks pengetatan kebijakan lingkungan negara mitra dagang, jumlah personel research and development, indeks daya saing ekspor, serta FTA berpengaruh signifikan terhadap nilai ekspor produk Core CLEG Indonesia. Sementara, GDP riil dan indeks pengetatan kebijakan lingkungan Indonesia tidak memberikan pengaruh yang signifikan., OECD and BRICS member countries dominated in the export of Indonesia's Core CLEG products. However, the stringency of environmental policies are a challenge for Indonesia's Core CLEG product exports. This study aims to analyze the competitiveness, dynamics, and impact of environmental policies stringency on Indonesia's Core CLEG products to 13 OECD and BRICS trading partner countries. The research methods are RCA, EPD, X-Model, and panel data regression. The RCA results showed that Indonesia's Core CLEG products do not have strong comparative competitiveness. The EPD results described the rising star market position. X-Model results show optimistic and potential market development. The panel data regression results showed that the real GDP of trading partner countries, the environmental policy stringency index of trading partner countries, the number of research and development personnel, RCA, and FTA have a significant effect on the export value of Indonesia's Core CLEG products. Meanwhile, Indonesia's real GDP and environmental policy stringency index do not have a significant effect.
Keyword: competitiveness, Core CLEG, environmental policy stringency, panel data

Judul: Analysis of Renewable Energy Directive Policy, Indirect Land Use Change, and Competitiveness of Indonesian CPO to European Union Market
Abstrak: Produk kelapa sawit dalam bentuk Crude Palm Oil (CPO) merupakan komoditas andalan ekspor Indonesia. Uni Eropa merupakan negara tujuan ekspor terbesar kedua CPO Indonesia yang mengeluarkan beberapa kebijakan terkait kelapa sawit, seperti kebijakan Renewable Energy Directive I, II, serta kebijakan Indirect Land Use Change yang dapat berpengaruh terhadap ekspor CPO Indonesia. Tujuan dari penelitian ini yaitu menganalisis daya saing serta kinerja ekspor CPO Indonesia setelah adanya kebijakan RED dan ILUC. Metode penelitian yang digunakan yaitu RCA, EPD, X-Model, dan regresi data panel. Hasil analisis RCA menunjukkan bahwa CPO Indonesia memiliki daya saing yang tinggi. Hasil analisis EPD menunjukkan bahwa CPO Indonesia berada pada posisi rising star dan retreat. Hasil analisis X-Model menunjukkan bahwa CPO Indonesia berada pada pengembangan pasar optimis dan kurang potensial. Hasil analisis regresi data panel menunjukkan bahwa variabel yang berpengaruh positif dan signifikan yaitu variabel nilai tukar riil. Variabel yang berpengaruh negatif dan signifikan yaitu GDP per kapita, dummy kebijakan RED, dan dummy kebijakan ILUC., Palm oil products in the form of Crude Palm Oil (CPO) are Indonesia's main export commodity. The European Union is the second largest export destination country for Indonesian CPO which has issued several policies related to palm oil, such as the Renewable Energy Directive I, II policies, and the Indirect Land Use Change policy which can affect Indonesian CPO exports. The aim of this research is to analyze the competitiveness and performance of Indonesian CPO exports after the RED and ILUC policies. The research methods used are RCA, EPD, X-Model, and panel data regression. The results of the RCA analysis show that Indonesian CPO has high competitiveness. The results of the EPD analysis show that Indonesian CPO is in a rising star and retreating position. The results of the X-Model analysis show that Indonesian CPO is in an optimistic and less potential market development. The results of the panel data regression analysis show that the variable that has a positive and significant effect is the real exchange rate variable. The variables that have a negative and significant influence are GDP per capita, the RED policy dummy, and the ILUC policy dummy.
Keyword: CPO, competitiveness, Indirect Land Use Change, Renewable Energy Directive, panel data regression

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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