Judul: Analisis lokasi keefektifan lubuk pakam sebagai pusat pengembangan Kabupaten Deli Serdang Propinsi Sumatera Utara
Abstrak: Tunjuan penelitian ini adalah untuk menganalisa lokasi keefektifan Lubuk Pakam sebagai pusat pengembangan wilayah kabupaten Deli Serdang dengan cara megnidentifikasi pusat pelayanan dan lokasi pelayanan. dst
Keyword: Analisis lokasi, Kab. Deli Serdang

Judul: Analisis kawasan hutan dan kawasan lindung dalam rangka arahan penataan ruang di Kabupaten Deli Serdang
Abstrak: As an upstream and buffer areas, the ecological existence of forest and other protected areas have an important role in Deli Serdang district. Nowadays, forest and other protected areas has been degraded due to the increasing population and development activities. Without any effort to reduce the degradation, the problem will even more serious and give a worse impact in the future. A research that aims to : (1) analyze forest area and other protected area in accordance to biophysical condition that should be maintained; (2) formulate guidelines of land allocation of district according to biophysical condition; (3) analyze the possibility of improper use of protected area function in Deli Serdang district and (4) find out the indication of population pressure to protected area was carried out at Deli Serdang district. Data processing and analysis were done with GIS system through overlay operation of different themes of data. The result of analysis showed that the forest area that should be maintained were 50.009 ha (20,02 %). Identification of protected area based on Presidential Decree No. 32 year 1990 showed that 96,764 ha (38.74%) were the protected area, while the remaining 153,016 ha or 61.26 % were the cultivation area. In total, there were 34.95% of the protected areas which were used for production or cultivation. According to the analysis result, there were 312 villages which have population pressure more than 1 and 66.59% of those villages are in the protected area.
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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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