Judul: Peningkatan Produktivitas Proses Budidaya Karet Alam dengan Pendekatan Green Productivity (Studi Kasus di PT. XYZ)
Abstrak: Indonesia is the second largest natural rubber producer in the world, with 28% of the total world production in 2010. In line with the growth of the world's automotive industry, the needs of rubber as a complementary synthetic rubber products will also increase. The main objective this research was to find the best alternative strategy to increase the productivity of the natural bber plantations through the green productivity (GP) approach. The case study was conducted at PT. XYZ, a private company which runs in the plantation and processing of natural rubber usinesses. The material flow analysis was performed by using green stream map to analyze the seven Treen wastes. The best alternative strategy was determined by using of AHP model and several design Improvements scenario. The measurement of the alternative strategy performance was rated as the ture GPI and compared with the value of current GPI, which had been calculated on a case study hat was done. The results of this research will be able to provide the best improvement productivity rategy, the level of company's productivity which has been achived, and the productivity levels of The implementation strategy chosen.
Keyword: AHP, Green productivity, Green stream map, Green wastes, Natural rubber, Latex

Judul: Peningkatan produktivitas pada proses produksi karet alam dengan pendekatan green productivity (studi kasus di pt. xyz)
Abstrak: The productivity issues are the integral part in the industrial world. These because the productivity is one of the industrial sustainability indicators in the future. Productivity could be Improved by reducing the waste generated. The productivity improvement of natural rubber production process in the PT. XYZ have been accomplished. The current state analysis of green productivity measurement was used by using the green productivity indexing (GPI) method. The current state GPI measurement result for the production of ribbed smoked sheet is 0.269 while the brown crepe products result is 1.089. There are four alternative strategies to improve the green productivity in the PT. XYZ based on expert opinion. By using Analytical Hierarchy Process method, He reuse of water process was obtained as the alternative strategy choosen, with 0.336 for the weight value. The implementation of the selected alternative strategy shows the reducing of the Environmental impact as 3.565 for the production of ribbed smoked sheet and 0.538 for the Production of brown crepe. The implementation of the selected alternative strategies also shows the Green productivity increasing to 0.690 for the production of ribbed smoked sheet with 2.565 GP ratio and 3.889 for brown crepe product with 3.571 GP ratio.
Keyword: Natural rubber, Green productivity, Green productivity indexing, Ribbed smoked sheet, Brown crepe, Analytical hierarchy process, GP ratio

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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