Judul: The Correlation of Company Performance Levels in the  Implementation Stages of the CSR Program with the Community Satisfaction Index  (CSI)
Abstrak: Implementasi program CSR sering kali didominasi oleh kepentingan bisnis, dengan cenderung mengabaikan dampak lingkungan yang ditimbulkan. Masih banyak implementasi program CSR yang tidak memuaskan masyarakat karena tidak berjalan sesuai dengan harapan. PT Tirta Investama – Plant Citeureup sebagai salah satu perusahaan terbesar di Desa Cicadas melaksanakan program Cicadas Bijak Berplastik sebagai bentuk kepedulian terhadap masyarakat dan lingkungan sekitar. Penelitian ini bertujuan untuk menganalisis tingkat kinerja perusahaan dalam tahapan implementasi program CSR, mengidentifikasi Indeks Kepuasan Masyarakat (IKM), serta menganalisis hubungan antara keduanya. Pendekatan yang digunakan dalam penelitian ini adalah pendekatan kuantitatif yang didukung oleh data kualitatif untuk mendapatkan pemahaman yang mendalam. Hasil penelitian menunjukkan bahwa implementasi program CSR oleh PT Tirta Investama – Plant Citeureup berada dalam kategori sedang, sementara IKM menunjukkan pada kategori baik. Temuan ini mengindikasikan adanya hubungan yang signifikan antara tingkat kinerja perusahaan dalam implementasi CSR dengan Indeks Kepuasan Masyarakat., The implementation of CSR programs often prioritizes business interests, frequently overlooking environmental impacts. Many CSR initiatives still fail to satisfy communities due to not meeting their expectations. PT Tirta Investama – Plant Citeureup, as one of the largest companies in Cicadas village, has implemented the Cicadas Wise Plastic program as a demonstration of its commitment to local community and environmental concerns. This research aims to analyze the company's performance level in the stages of CSR program implementation, identify the Community Satisfaction Index (CSI), and examine the relationship between these factors. The research approach employed is quantitative, supplemented by a qualitative data to achieve a comprehensive understanding. The study findings indicate that the CSR program implementation by PT Tirta Investama – Plant Citeureup falls within a moderate category, while the CSI reflects a good category. These results suggest a significant relationship between the company's performance in CSR implementation and the Community Satisfaction Index.
Keyword: CSR, CSI, Community Satisfaction Index, IKM, Indeks Kepuasan Masyarakat, Implementasi Program, Program Implementation

Judul: Persepsi Terhadap Partisipasi Masyarakat, Efektivitas Program CSR, dan Keberdayaan Masyarakat (Kasus Program Water Access, Sanitation, and Hygiene oleh PT Tirta Investama Pabrik Cianjur)
Abstrak: Kebutuhan air bersih merupakan kebutuhan primer untuk masyarakat yang digunakan dalam kegiatan sehari-hari dan dikonsumsi. Namun, masih terdapat daerah di Indonesia yang ternyata mengalami kekurangan air bersih. Sebagai perusahaan yang berkomitmen dalam menjalankan usahanya, PT Tirta Investama Aqua Pabrik Cianjur melaksanakan program CSR terkait pengadaan air bersih untuk masyarakat. Partisipasi masyarakat merupakan unsur penting untuk mendukung efektivitas program CSR sehingga mampu untuk memberdayakan masyarakat itu sendiri. Penelitian ini bertujuan untuk menganalisis hubungan diantara variabel-variabel. Penelitian ini menggunakan metode penelitian campuran dimana dilakukan pendekatan kuantitatif menggunakan kuesioner dan pendekatan kualitatif dengan wawancara mendalam. Hasil penelitian ini menunjukkan adanya hubungan antara tingkat partisipasi masyarakat dengan tingkat efektivitas program CSR dan antara tingkat efektivitas program CSR dengan tingkat keberdayaan masyarakat., The need for clean water is a primary need for the community that is used in daily activities and consumed. However, there are still areas in Indonesia that are experiencing a lack of clean water. As a company that is committed to running its business, PT Tirta Investama Aqua Cianjur Factory carries out CSR programs related to the provision of clean water for the community. Community participation is an important element to support the effectiveness of CSR programs so that they can empower the community itself. This study aims to analyze the correlation betweeen the variables. This study used a mixed research method where a quantitative approach was carried out using questionnaires and a qualitative approach with in-depth interviews. The results of this study show a correlation between the level of community participation with the level of effectiveness of CSR program and between the level of effectiveness of CSR program and the level of community empowerment.
Keyword: community participation level, effectiveness level of CSR program, community empowerment level

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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