Judul: Economic Benefit of Restaurant Waste (Case Study: TPS 3R Nakal Berbintang, Purwakarta Regency)
Abstrak: Peningkatan pendapatan mendorong perubahan konsumsi pada sektor pangan yang berimplikasi pada peningkatan jumlah restoran. Hal ini memberikan dampak negatif terhadap lingkungan karena timbulan sampah yang dihasilkan. Permasalahan tersebut dapat diatasi melalui Tempat Pengolahan Sampah Reduce, Reuse, and Recycle (TPS 3R). TPS 3R memberikan banyak manfaat sehingga perlu dijaga keberlanjutannya. Berdasarkan hal tersebut, maka tujuan penelitian ini; (1) mengidentifikasi jumlah timbulan dan komposisi sampah restoran di TPS 3R Nakal Berbintang, (2) mengestimasi nilai manfaat langsung dari kegiatan pengolahan sampah restoran, (3) mengestimasi nilai manfaat tidak langsung dari kegiatan pengolahan sampah makanan restoran, dan (4) merumuskan strategi dalam pengelolaan sampah restoran di TPS 3R Nakal Berbintang. Hasil analisis dengan metode SNI menunjukkan timbulan sampah dari seluruh restoran mencapai 181,23 kg/hari dengan komposisi sampah tertinggi yaitu residu. Hasil analisis pendapatan menunjukkan nilai manfaat langsung pengelolaan sampah restoran sebesar -Rp88.496.941,00. Selain itu, hasil analisis nilai manfaat tidak langsung dengan metode IPCC menunjukkan reduksi emisi GRK pengolahan sampah makanan sebesar sebesar 1.662,58 kg CO2e/tahun dengan penghematan biaya lingkungan sebesar Rp49.878,00/tahun. Prioritas strategi pengelolaan sampah restoran dari hasil analisis SWOT serta QSPM yaitu edukasi dan pelatihan pengelola TPS 3R., Increased income changes consumption in food sector which implies an increase the number of restaurants. This has negative impact on the environment due to waste generated. The problem can be solved through Reduce, Reuse, and Recycle Waste Processing (TPS 3R). It provides many benefits so the continuity needs to be maintained. Based on this, the objectives of this research are; (1) to identify the amount of waste generation and composition of restaurant waste at TPS 3R Nakal Berbintang, (2) to estimate direct benefits of restaurant waste processing, (3) to estimate indirect benefits from restaurant food waste processing, and (4) to formulate strategy in managing restaurant waste. The results analysis using SNI method showed that waste generation from all restaurants reached 181,23 kg/day with the highest waste composition is residue. The income analysis result show the direct benefit is -IDR88.496.941,00. In addition, the results of indirect benefit analysis using IPCC method showed a reduction in food waste processing GHG emissions is 1.662,58 kg CO2e/year with environmental cost savings is IDR49.878,00/year. Prioritization of restaurant waste management strategy from SWOT and QSPM analysis result is education and training for TPS 3R managers.
Keyword: emisi sampah, reduksi sampah, strategi pengelolaan sampah

Judul: Analisis Manfaat  Ekonomi dan Tingkat Partisipasi Pengelola Sampah Rumah Tangga di Kabupaten  Bogor (Kasus: TPS 3R “Green Altari”)
Abstrak: Jumlah penduduk Indonesia yang cenderung meningkat menyebabkan permasalahan sampah menjadi lebih kompleks. Pemerintah Kabupaten Bogor mendirikan Tempat Pengelolaan Sampah (TPS) 3R Green Altari sebagai suatu inovasi dalam pengelolaan sampah lingkup masyarakat. Tujuan penelitian ini adalah (1) menganalisis manfaat ekonomi dari pengelolaan sampah di TPS 3R Green Altari, (2) menganalisis tingkat partisipasi pengelola sampah rumah tangga di TPS 3R Green Altari, (3) mengidentifikasi faktor-faktor yang memengaruhi partisipasi pengelola TPS 3R Green Altari dalam pengelolaan sampah, dan (4) merekomendasikan strategi pengelolaan sampah di TPS 3R Green Altari. Metode analisis data yang digunakan adalah analisis pendapatan, benefit transfer, analisis deskriptif kuantitatif, analisis regresi linear berganda, dan analisis deskriptif kualitatif. Hasil penelitian menunjukkan total manfaat ekonomi pada skenario I sebesar Rp5.836.009,01 per tahun, pada skenario II sebesar Rp15.172.009,01 per tahun, dan pada skenario III manfaat ekonomi yang diperoleh adalah sebesar Rp312.015.517,11 per tahun. Rata-rata tingkat partisipasi pengelola TPS 3R Green Altari termasuk dalam kategori sedang dan hasil analisis regresi linier berganda menunjukkan bahwa faktor yang signifikan memengaruhi tingkat partisipasi pengelola pada taraf nyata 5% adalah ketersediaan waktu luang dan lama pendidikan. Rekomendasi strategi yang dapat dilakukan oleh TPS 3R Green Altari adalah dengan memerhatikan berbagai aspek mulai dari pembiayaan, kelembagaan, peraturan, sampai partisipasi dari setiap aktor., One of the causes of complex waste problems in Indonesia is the continuously increasing population. This study aimed to achieve the following objectives: (1) analyze the economic benefits of waste management at TPS 3R Green Altari, (2) analyze the level of staff participation at TPS 3R Green Altari. (3) identify factors influencing the participation of TPS 3R Green Altari staff in waste management, and (4) analyze effective waste management strategies at TPS 3R Green Altari. The data analysis methods employed included income analysis, benefit transfer, quantitative descriptive analysis, multiple linear regression analysis, and qualitative descriptive analysis. The research findings revealed that the economic benefits obtained in scenario I are IDR5.836.009,01 per year, while in scenario II, the economic benefits were IDR15.172.009,01 per year, and in scenario III, the economic benefits were IDR312.015.517,11 per year. The average level of participation among TPS 3R Green Altari staff is categorized as moderate. The results of multiple linear regression analysis indicated that the availability of free time and education were significant factors influencing the managers level of participation at a 5% significance level. The recommended strategy for TPS 3R Green Altari is to consider various aspects such as financing, institutional factors, regulations, and the involvement of all stakeholders.
Keyword: carbon reduction, income analysis, indirect benefits, management  scenarios, quantitative analysis

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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