Judul: Productivity improvement strategy for supporting national cane-sugar industrial cluster policy
Abstrak: Indonesian cane-sugar industry face several serious problems indicated by increasing of sugar imported amount of 1.27 million ton in the year 2006 compared with 1.49 million ton in 2007. If such condition continued, Indonesian sugar factories sustainability, esspecially those in BUMN affiliation will be threated. This research was aimed to formulate the strategy for productivity improvement of national cane-sugar industry. The stages of this research consisted of national cane-sugar factories performance evaluation, problem identification and strategy formulation on cane-sugar industrial productivity improvement. The methods used were institutional analysis and Interpretive Structural Modelling, Policy Analysis Matrix, Objective Matrix, Porter’s Diamond Model and SWOT-AHP. Survey, interviews and data collection for productivity measurement were conducted at four cane sugar factories, i.e. Gunung Madu, Bungamayang, Kebon Agung and Pesantren Baru cane sugar factories which represented national cane sugar industry. The results showed that natioan cane sugar industry productivity improvement can be reached through intensification of sugar cane cultivation through implementation of Good Agricultural Practises (GAP), improvement of factories efficiency through implementation of Good Manufacturing Practises (GMP), and sincronizing of government policy and regulation on national cane-sugar industral productivity improvement.
Keyword: 

Judul: Analisis efisiensi proses produksi untuk peningkatan kinerja industri gula tebu (Cane Sugar) (Studi kasus di PG. Jatiluhur Majalengka, Jawa Barat)
Abstrak: Sugar is one of the most important commodities in Indonesia. Most of sugar manufacturing in Indonesia was owned or sun by Indonesian government. Sugar consumption rate cannot be fulfilled by local sugar manufacturer, that's why importing sugar became an option. The insignificant rate of increasing of sugar production every year make import rate is keep increasing Efficiency in sugar production process is one thing that need some attention. This time, most of sugar factory that owned by government are decreasing in productivity. PG Jatitujuh is sugar processing factory that processing cane into white crystal sugar (SHS) and one of sugar factory in Java that still runs well. Efficiency in sugar production process can be analyzed by using PG Jatitujuh production data. Analysis result shows that efficiency in sugar production process can be rendered, by optimalised increasing of imbibitions water. The optimum value of imbibitions water is 25-30 percent of processed cane. The decline of pol value in the amount of 0,01 percent is equal with 1,729 ton or equal with Rp. 8.297.865,- recovery sugar £rom bagasse. The decline of HK value in the amount of 0,01 percent is equal with 0,273 ton or equal with Rp. 1.3 12.524,- recovery sugar from molasses.
Keyword: 

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.
Keyword: