Judul: Analisis Dampak Investasi Sosial Program CSR The Gade Clean  and Gold dengan Metode SROI dan AHP pada PT Pegadaian
Abstrak: Bank sampah menjadi salah satu alternatif dalam mengatasi masalah sampah rumah tangga di Kabupaten Bogor, namun karena sifatnya yang sukarela dan tanpa ada pengawasan secara khusus dari pihak tertentu membuat operasional bank sampah dapat terhambat atau bahkan terhenti. PT Pegadaian dengan program Corporate Social Responsibility (CSR) yang mengusung tema “The Gade Clean and Gold” memilih Bank Sampah Asri Mandiri RW 06 Desa Benteng sebagai salah satu bank sampah binaannya supaya tetap menjadi solusi pengelolaan sampah yang berkelanjutan di daerah tersebut. Tujuan dari penelitian ini adalah mengetahui dampak sosial dan besarnya dampak yang diterima oleh para pemangku kepentingan (stakeholder) dari program CSR ini menggunakan metode analisis Social Return on Investment (SROI) dan memberikan rekomendasi berdasarkan peringkat alternatif menggunakan metode Analytical Hierarchy Process (AHP). Hasil penelitian ini menunjukkan rasio SROI 1,29:1 yang artinya setiap Rp 1, - yang diinvestasikan menghasilkan dampak/manfaat setara dengan Rp 1,29, -. Sehingga investasi sosial pada program ini layak dan dapat terus dikembangkan. Sedangkan hasil perhitungan AHP menunjukan rangking prioritas alternatif tertinggi, yaitu fokus program pengadaan sarana dan prasarana dengan nilai 0,419 dengan tingkat konsistensi CI 0,0072., The waste banks had emerged as one alternative to address household waste issues in Bogor Regency. However, due to their voluntary nature and lack of specific oversight from any party, waste banks' operations could be hindered or even halted. PT Pegadaian, through its Corporate Social Responsibility (CSR) program themed "The Gade Clean and Gold", had selected Bank Sampah Asri Mandiri RW 06 Desa Benteng as one of its fostered waste banks to ensure the continued solution for sustainable waste management in the area. This study aimed to assess the social impact and magnitude of the effects received by stakeholders of this CSR program using the Social Return on Investment (SROI) analysis method and provided recommendations based on suitable alternative rankings using the Analytical Hierarchy Process (AHP) method. The results of this study indicated an SROI ratio of 1.29:1, which means that every Rp 1, - invested generates impacts/benefits equivalent to Rp 1.29, -. Therefore, the Analytic Hierarchy Process (AHP) results indicated the highest priority ranking of alternatives is the focus on the procurement program for facilities and infrastructure, with a value of 0.419 with Consistency Index (CI) of 0.0072.
Keyword: analytical hierarchy process, bank sampah, corporate social responsibility, pemangku kepentingan

Judul: Analysis of the Economic Benefits of Community-Based Waste Management (Case Study: Sindara Berkah Waste Bank, Gunung Batu Village, Bogor City)
Abstrak: Bank sampah merupakan contoh strategi pengelolaan sampah yang berfokus pada konsep 3R (reduce, reuse, recycle). Salah satu bank sampah yang ada di Kelurahan Gunung Batu, Kota Bogor adalah Bank Sampah Sindara Berkah. Jumlah nasabah yang berpartisipasi di Bank Sampah Sindara Berkah dinilai masih rendah karena kurangnya kesadaran akan pentingnya mengelola sampah. Penelitian ini bertujuan (1) Mengidentifikasi sistem pengelolaan sampah di Bank Sampah Sindara Berkah, (2) Menganalisis persepsi nasabah terkait pengelolaan sampah di Bank Sampah Sindara Berkah, dan (3) Menganalisis manfaat ekonomi dari pengelolaan sampah di Bank Sampah Sindara Berkah. Metode yang digunakan pada penelitian ini adalah analisis deskriptif kualitatif dan kuantitatif, serta analisis pendapatan. Hasil penelitian ini menunjukkan sistem pengelolaan yang dijalankan oleh bank sampah masih dikategorikan sederhana. Persepsi nasabah terhadap Bank Sampah Sindara Berkah sangat baik. Hasil perhitungan dari analisis pendapatan sebesar Rp 668.800,00. Hasil akhir analisis menunjukkan bahwa keberadaan bank sampah memberikan manfaat kepada nasabah terutama nasabah Bank Sampah Sindara Berkah., The waste bank is an example of a waste management strategy with the 3R concept (Reduce, reuse, recycle). One of the waste banks in Gunung Batu Village, Bogor City is the Sindara Berkah Waste Bank. The number of customers participating in the Sindara Berkah Waste Bank is considered low due to a lack of awareness of the importance of managing waste. This study aims (1) to identify the waste management system at the Sindara Berkah Waste Bank, (2) to analyze public perceptions regarding waste management at the Sindara Berkah Waste Bank, and (3) to analyze the economic benefits of waste management at the Sindara Berkah Waste Bank. The method used in this research is descriptive qualitative and quantitative analysis, as well as income analysis. The results of this study indicate that the management system run by the bank is still categorized as simple. The public perception of the Sindara Berkah Waste Bank is very good. The result of the calculation from the income analysis is IDR 668.800.00. The final result of the analysis shows that the existence of the waste bank provides benefits to the community, especially the customers of the Sindara Berkah Waste Bank.
Keyword: likert, partistipasi,, partistipasi, pendapatan, persepsi, sampah anorganik, income, inorganic waste, likert, participation, perception

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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