Judul: Estimation of The Value of Economic Losses of Culinary MSE Due to Earthquakes Case Study: Cugenang Sub-district.
Abstrak: Gempa bumi di Kabupaten Cianjur menyebabkan kerusakan terhadap bangunan, aset fisik, dan kerugian finansial karena terhentinya aktivitas perekonomian. Penelitian terkait kerusakan dan kerugian ekonomi akibat gempa bumi pada UMK Kuliner masih minim. Tujuan penelitian ini adalah mengidentifikasi tingkat kerusakan aset fisik pelaku UMK Kuliner pasca gempa bumi, mengestimasi nilai kerusakan dan kerugian ekonomi pelaku UMK Kuliner, dan menganalisis strategi program pemulihan UMK Kuliner. Penelitian ini menggunakan metode deskriptif, tarif penyusutan garis lurus, Damage and Loss Assesment, Loss of Income, dan Content Analysis. Hasil penelitian menunjukkan mayoritas pelaku UMK Kuliner mengalami kerusakan kategori berat. Total kerugian yang dialami pelaku UMK Kuliner di Kecamatan Cugenang, Kabupaten Cianjur akibat gempa bumi sebesar Rp2.332.342.549 dengan nilai rata-rata kerusakan setiap responden Rp77.744.751. Nilai kehilangan pendapatan UMK Kuliner di Kecamatan Cugenang akibat gempa bumi sebesar Rp84.905.405 selama satu bulan dengan nilai rata-rata setiap responden Rp2.830.180/bulan. Bantuan dana, pembinaan dan pendampingan Pelaku UMK, serta bantuan bahan pokok dan logistik menjadi strategi pemulihan yang paling banyak diterapkan sebagai upaya pemulihan pasca gempa bumi., The earthquake in Cianjur Regency caused damage to buildings, physical assets and financial losses due to the cessation of economic activity. Research related to damage and economic losses due to the earthquake on Culinary MSEs is still minimal. The purpose of this study is to identify the level of damage to physical assets of Culinary MSEs after the earthquake, estimate the value of damage and economic losses of Culinary MSEs, and analyze the recovery program strategy of Culinary MSEs. This research uses descriptive methods, straight-line depreciation rates, Damage and Loss Assessment, Loss of Income, and Content Analysis. The results showed that the majority of Culinary MSEs suffered heavy category damage. The total loss experienced by culinary MSEs in Cugenang sub-district due to the earthquake amounted to Rp2,332,342,549 with an average value of damage per respondent amounted to Rp77,744,751. The value of lost income for culinary MSEs in Cugenang sub-district due to the earthquake amounted to Rp84,905,405 for one month with an average value for each respondent of Rp2,830,180/month. Funding assistance, coaching and mentoring for MSE actors, as well as basic material and logistical assistance are the recovery strategies most widely applied post-earthquake recovery efforts.
Keyword: content analysis

Judul: Estimation of Economic Losses of Rice Farmers and  Agricultural Sector Recovery Strategies After Earthquake in Cianjur Regency
Abstrak: Gempa bumi berkekuatan 5,6 magnitudo yang terjadi di Kabupaten Cianjur disebabkan oleh aktivitas sesar aktif pada bagian timur laut zona sesar Cimandiri. Dampak yang ditimbulkan yaitu kerusakan dan kerugian pada sektor pertanian, termasuk petani padi. Kondisi lingkungan, sosial, dan ekonomi petani padi juga mengalami perubahan yang harus segera dipulihkan agar dapat kembali beraktivitas normal. Penelitian bertujuan untuk menganalisis persepsi petani padi terhadap dampak gempa bumi pada sektor pertanian, mengestimasi nilai kerugian ekonomi usaha tani padi akibat gempa bumi, serta mengidentifikasi strategi pemulihan sektor pertanian pasca-gempa bumi di Kabupaten Cianjur. Penelitian menggunakan pendekatan mixed method. Analisis kuantitatif menggunakan metode change of productivity dan loss of income. Sementara itu, analisis kualitatif menggunakan model interaktif dan content analysis. Hasil penelitian menunjukkan bahwa gempa bumi berdampak paling besar pada kerusakan bangunan penggilingan padi. Sementara itu, petani tidak berencana mengubah pola tanam, tidak ingin direlokasi, dan menunggu bantuan dari pemerintah. Perubahan produktivitas petani padi sawah di Kecamatan Warungkondang sebesar 1,15 ton/ha/MT. Selain itu, perubahan pendapatan usaha tani padi sawah pasca-gempa bumi di Kecamatan Warungkondang turun sebesar Rp4.016.252 atau 40,55 persen. Terdapat 11 strategi pemulihan sektor pertanian pasca-gempa bumi di Kabupaten Cianjur dengan keterlibatan 10 lembaga atau organisasi., The 5.6 magnitude earthquake in the Cianjur Regency was caused by active fault activity in the northeastern part of the Cimandiri fault zone. The impact was damage and losses to the agricultural sector, including rice farmers. The environmental, social, and economic conditions of rice farmers also experienced changes that must be restored immediately in order to return to normal activities. The study aimed to analyze rice farmers' perceptions of the impact of the earthquake on the agricultural sector, estimate the value of economic losses to rice farming due to the earthquake, and identify strategies for post-earthquake recovery of the agricultural sector in the Cianjur Regency. The research used a mixed-method approach. Quantitative analysis used the change of productivity and loss of income methods. Meanwhile, the qualitative analysis used interactive models and content analysis. The results showed that the earthquake had the greatest impact on damage to rice mill buildings. Meanwhile, farmers do not plan to change their cropping patterns, do not want to be relocated, and are waiting for assistance from the government. Changes in productivity of rice field farmers in Warungkondang Subdistrict amounted to 1.15 tons/ha/MT. In addition, post-earthquake changes in rice field farming income in the Warungkondang sub-district decreased by IDR 4,016,252 or 40.55 percent. There are 11 strategies for post-earthquake agricultural sector recovery in the Cianjur Regency with the involvement of 10 institutions or organizations.
Keyword: padi sawah, penilaian kerugian ekonomi, ring of fire, surat kabar, tanaman pangan

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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