Judul: Evaluation of Tree Species Suitability in Pesanggrahan  Sangga Buana Urban Forest South Jakarta
Abstrak: Pembangunan hutan kota memerlukan perencanaan melalui pemilihan jenis pohon yang sesuai berdasarkan tapak agar manfaat dan fungsi hutan kota optimal. Penelitian ini bertujuan menilai tingkat kesesuaian jenis pohon berdasarkan agregat faktor silvikultur, manajemen, estetika, dan kesehatan pohon. Prosedur penelitian meliputi penentuan kriteria faktor evaluasi, pengumpulan data, pembobotan kriteria menggunakan Analytical Hierarchy Process, penyusunan persamaan evaluasi kesesuaian jenis pohon, penentuan tingkat kesesuaian jenis pohon di masing-masing area. Penelitian menghasilkan persamaan evaluasi kesesuaian jenis pohon pada: a) area jogging track= 0,16.S + 0,48.M+ 0,07.E + 0,29.K, b) sempadan sungai= 0,20.S + 0,24.M + 0,05.E + 0,50.K, c) playground= 0,11.S + 0,28.M + 0,14.E + 0,46.K; dimana: S= skor faktor silvikultur, M= skor faktor manajemen, E= skor faktor estetika, dan K= skor faktor kesehatan. Jenis pohon dengan kesesuaian sangat tinggi pada area jogging track yaitu sukun dan kecapi. Pohon petai cina, kedondong, dan nangka memiliki kesesuaian yang tinggi di sempadan sungai. Pada area playground pohon trembesi, bunga kupu-kupu, melinjo, kamboja, dan matoa memiliki kesesuaian yang sangat tinggi., The development of an urban forest requires planning through selecting appropriate tree species based on the site so that the benefits and functions of the urban forest are optimal. This study aimed to assess the level of suitability between the trees species based on factor aggregate of silviculture, management, aesthetic, and tree health. Research procedures include determining evaluation factor criteria, data collection, weighting criteria using the Analytical Hierarchy Process, preparing tree species suitability evaluation equations, determining the level of suitability of tree species in each area. The research produced equations for evaluating the suitability of tree species in: a) jogging track= 0,16.S + 0,48.M + 0,07.E + 0,29.K, b) river border= 0,20.S + 0,24.M + 0,05.E + 0,50.K, c) playground= 0,11.S + 0,28.M + 0,14.E + 0,46.K; where: S= silvicultural factor score, M= management factor score, E= aesthetic factor score, and K= health factor score. The tree species with a high suitability on the jogging track area are breadfruit and cotton fruit. The leucaena, june plum, and jackfruit trees have a high suitability at the river border. In the playground area, rain tree, butterfly tree, gnetum, frangipani, and matoa have very high suitability.
Keyword: evaluation factor, suitability, tree species

Judul: Evaluasi Kesesuaian Jenis Pohon di Hutan Kota Kemayoran, Jakarta Utara
Abstrak: Pembangunan hutan kota perlu perencanaan seperti pemilihan jenis pohon yang sesuai agar hutan kota berfungsi dengan baik. Penelitian bertujuan untuk menilai tingkat kesesuaian jenis pohon berdasarkan faktor gabungan dari ekologi-biomorfologi, perawatan dan keamanan, estetika serta kesehatan pohon. Tahapan penelitian meliputi perumusan kriteria faktor evaluasi, penentuan segmen lokasi pengambilan data, pengumpulan data, penilaian individu dan jenis pohon untuk setiap faktor. Selanjutnya, Analytical Hierarchy Process digunakan untuk penyusunan persamaan evaluasi tingkat kesesuaian dari faktor gabungan dengan menentukan bobot setiap faktor. Tahap terakhir adalah analisis hasil evaluasi tingkat kesesuaian pada tiap segmen. Persamaan evaluasi kesesuaian jenis pohon yang dihasilkan pada: a) segmen pinggir jalan = 0,29B + 0,21P + 0,35E+ 0,15K, b) segmen tepi danau = 0,21B + 0,27P + 0,33E+ 0,19K, dan c) area nonintensif = 0,08B + 0,25P + 0,50E+ 0,17K. Jenis pohon dengan tingkat kesesuaian sangat tinggi di pinggir jalan adalah trembesi, angsana, dan matoa; tepi danau adalah trembesi dan lamtoro; area nonintensif adalah matoa, lamtoro, dan trembesi., The development of urban forests needs planning such as the selection of appropriate tree species, so that the urban forest functions properly. The research aims to assess the level of suitability of tree species based on combined factors of ecology-biomorphology, maintenance and safety, aesthetics and tree health. The research stages include formulation of evaluation factor criteria, determination of data collection location segments, data collection, individual and tree species assessment for each factor. Furthermore, the Analytical Hierarchy Process was used to develop an evaluation equation for the suitability level of the combined factors by determining the weight of each factor. The last stage is the analysis of the results of the evaluation of the level of suitability in each segment. The resulting tree species suitability evaluation equation in: a) roadside segment = 0.29B + 0.21P + 0.35E + 0.15K, b) lakeside segment = 0.21B + 0.27P + 0.33E + 0.19K, and c) non-intensive area = 0.08B + 0.25P + 0.50E + 0.17K. Tree species with a very high level of suitability on the roadside are trembesi, angsana, and matoa; lakeside are trembesi and lamtoro; nonintensive areas are matoa, lamtoro, and trembesi.
Keyword: factor, suitability, tree species

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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