Judul: Strategi Peningkatan Kinerja Rantai Pasok Agroindustri Salak Berorientasi Ekspor Di Masa Pandemi (Studi Kasus: PT X Jakarta).
Abstrak: Kinerja rantai pasok salak saat ini masih memiliki hambatan untuk orientasi ekspor. Tujuan penelitian ini adalah mengetahui mekanisme rantai pasok agroindustri salak orientasi ekspor, mengukur kinerja rantai pasok salak, dan perumusan alternatif strategi untuk meningkatkan kinerja ekspor. Mekanisme rantai pasok agroindustri salak diidentifikasi dengan metode kualitatif. Penelitian ini dilakukan dengan metode SCOR untuk mengetahui kinerja rantai pasok salak orientasi ekspor dan metode analytical network process (ANP) untuk pemilihan alternatif strategi peningkatan kinerja rantai pasok. Hasil pengukuran kinerja rantai pasok menunjukkan matriks reliabilitas telah mencapai 100%, matriks fleksibilitas dan responsivitas selama 2 hari, tidak terdapat penyimpanan salak, dan matriks biaya rantai pasok adalah 37,22%. Hal tersebut menunjukkan bahwa kinerja rantai pasok agroindustri salak orientasi ekspor cukup baik, hanya biaya rantai pasok yang masih tinggi. Biaya tinggi disebabkan hambatan ekspor berupa kualitas salak yang memiliki umur simpan yang pendek sehingga distribusi menggunakan pesawat yang memiliki biaya tinggi dibandingkan dengan kapal. Strategi peningkatan kinerja terpilih yaitu peningkatan kualitas yang dapat dilakukan dengan pembimbingan budidaya hingga panen buah salak oleh pemerintah dan perusahaan, serta peningkatan teknologi pasca panen buah salak. Biaya yang tinggi dapat diatasi dengan peningkatan teknologi pasca panen sehingga salak memiliki umur simpan yang lebih lama, serta biaya distribusi ekspor lebih rendah., The current performance of the snake fruit supply chain still have obstacles that occur for export orientation. The purpose of this study was to determine the supply chain mechanism of export-oriented snake fruit agroindustry, measurement of snake fruit supply chain performance, and formulate alternative strategies to improve export performance. The supply chain mechanism for snake fruit agroindustry was identified by qualitative methods. This research was conducted using the SCOR method to determine the performance of the export- oriented snake fruit supply chain and the analytical network process (ANP) method for selecting alternative strategies to improve supply chain performance. The results of the supply chain performance measurement show that the reliability performance matrix has reached 100%, the flexibility and responsiveness performance matrix for 2 days, and 37,22% supply chain costs. This shows that the performance of the export-oriented snake fruit agro- industry supply chain is quite good, only the supply chain costs are still high. Supply chain costs are still high due to export barriers in the form of snake fruit quality having a short shelf life so that distribution use airplane which have high costs compared to ships. The selected performance improvement strategy is quality improvement that can be done by guiding the cultivation to harvesting snake fruit by the government and companies, as well as improving post-harvest technology for snake fruit. High costs can be overcome by improving post- harvest technology so that snake fruit have a longer shelf life and lower export distribution costs.
Keyword: ANP, export performance, supply chain, snake fruit (salaca zalacca), SCOR

Judul: Strategy to Improve the Performance of the Export-Oriented Mango Agro-Industry Supply Chain During the Pandemic (Case Study: PT X Cirebon)
Abstrak: Kinerja rantai pasok mangga saat ini masih memiliki hambatan untuk orientasi ekspor. Tujuan penelitian ini adalah mengetahui mekanisme rantai pasok agroindustri mangga orientasi ekspor, mengukur kinerja rantai pasok mangga, dan perumusan alternatif strategi untuk meningkatkan kinerja ekspor. Mekanisme rantai pasok agroindustri mangga diidentifikasi dengan metode kualitatif. Penelitian ini dilakukan dengan metode Supply Chain Operations Reference (SCOR) untuk mengetahui kinerja rantai pasok mangga orientasi ekspor dan metode Analytical Network Process (ANP) untuk pemilihan alternatif strategi peningkatan kinerja rantai pasok. Hasil pengukuran kinerja rantai pasok menunjukkan matriks reliabilitas telah mencapai 100%, matriks fleksibilitas dan responsivitas selama 3 hari, tidak terdapat penyimpanan mangga, dan biaya rantai pasok 22,31%. Hal tersebut menunjukkan bahwa kinerja rantai pasok agroindustri mangga orientasi ekspor cukup baik, hanya biaya rantai pasok yang belum efisien. Biaya tinggi disebabkan hambatan ekspor berupa kualitas mangga memiliki umur simpan yang pendek sehingga distribusi menggunakan airline yang memiliki biaya tinggi dibandingkan dengan kapal. Strategi peningkatan kinerja terpilih yaitu peningkatan kualitas yang dapat dilakukan dengan pembimbingan budidaya hingga panen oleh pemerintah dan perusahaan, serta peningkatan teknologi pasca panen mangga. Biaya tinggi dapat diatasi dengan peningkatan teknologi pasca panen sehingga mangga memiliki umur simpan yang lebih lama, serta biaya distribusi ekspor lebih rendah., The current performance of the mango supply chain had barriers to export orientation. The purpose of this study was to determine the supply chain mechanism for export-oriented mango agroindustry, measure the performance of the mango supply chain, and formulate alternative strategies to improve export performance. Mango agroindustry supply chain mechanism identified by the qualitative method. This research was conducted using the Supply Chain Operations Reference (SCOR) method to determine the supply chain performance of export-oriented mangoes and the Analytical Network Process (ANP) method to select alternative supply chain performance improvement strategies. The results of the supply chain performance measurement show that the reliability matrix has reached 100%, the flexibility and responsiveness matrix for 3 days, there was not mango storage, and the supply chain cost was 22.31%. This shows that the supply chain performance of the export-oriented mango agroindustry was quite good, only the supply chain costs were not yet efficient. The high cost was due to export barriers in the form of mango quality having a short shelf life so that distribution used airlines which have high costs compared to ships. The selected performance improvement strategy was quality improvement by improving mango post - harvest technology.
Keyword: analytical network process, export performance, supply chain, mango, supply chain operations reference

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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