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 Social Impact of Home Garden's CSR Program at PT Unilever Oleochemical Indonesia Using the Social Return on Investment (SROI) Method
Abstrak: Pelaksanaan Corporate Social Responsibility (CSR) masih mengalami permasalahan terkait dengan penilaian tingkat efektivitas program serta dampak yang diakibatkan oleh suatu program. Social Return on Investment (SROI) merupakan salah satu alat analisis dalam penilaian dampak. Dalam penelitian ini bertujuan untuk menganalisis tingkat efektivitas dan menganalisis dampak serta tingkat pengembalian sosial dari program CSR Home Garden dengan menghitung nilai rasio SROI dan capaian finansial. Tipe data yang digunakan yaitu data primer berupa wawancara dan kuesioner serta data sekunder berupa laporan kegiatan dari perusahaan. Metode penelitian menggunakan alat analisis efektivitas program serta menghitung SROI. Hasil penelitian menunjukan bahwa nilai rasio SROI yaitu 2.13: 1, yang berarti bahwa setiap dana Rp1 yang disalurkan perusahaan menciptakan nilai pengembalian sosial sebesar Rp2,13. Serta nilai capaian finansial dari penelitian didapatkan Rp84.028.783 dari total nilai input sebesar Rp38.183.750. Hal tersebut menunjukan bahwa program masih layak untuk diteruskan, karena rasio SROI bernilai positif atau masih di atas satu., The implementation of CSR is still experiencing problems related to the assessment of the level of program effectiveness and the impact caused by a program. Social Return on Investment (SROI) is one of the analytical tools in impact assessment. This study aims to analyze the level of effectiveness and analyze the impact and social returns of the CSR Home Garden program by calculating the SROI ratio value and financial achievement. The type of data used is primary data in the form of interviews and questionnaires and secondary data in the form of activity reports from the company. The research method uses program effectiveness analysis tools and calculates SROI. The results show that the value of the SROI ratio is 2.13: 1, which means that every Rp1 fund distributed by the company creates a social return of Rp2,13. And the value of financial achievement from the research obtained Rp84.028.783 from the total input value of Rp38.183.750. This shows that the program is still feasible to continue, because the SROI ratio is positive or still above one.
Keyword: Corporate Social Responsibility, Social Impact, Social Return on Investment

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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