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: Tree Function in Environmental Conservation on the Green Lane of Jalan Pajajaran, Bogor City
Abstrak: Jalur hijau jalan yang dibangun harus dapat memberikan berbagai fungsi secara optimal. Salah satu fungsi jalur hijau jalan adalah konservasi lingkungan. Oleh sebab itu, pohon sebagai penyusun jalur hijau perlu dievaluasi tingkat kesesuaiannya dengan fungsi konservasi lingkungan. Penelitian ini bertujuan mengevaluasi kesesuaian jenis pohon dalam konservasi lingkungan berdasarkan faktor fungsi perlindungan dan pengendalian lingkungan, fungsi konservasi flora dan fauna, fungsi estetika, dan kesehatan pohon di jalur hijau Jalan Pajajaran, Kota Bogor. Prosedur penelitian meliputi perumusan kriteria faktor fungsi pohon, pengumpulan data, pembobotan kriteria menggunakan Analytical Hierarchy Process, penyusunan persamaan evaluasi kesesuaian jenis pohon, dan penentuan tingkat kesesuaiannya. Penelitian menghasilkan persamaan evaluasi kesesuaian jenis pohon di jalur hijau Jalan Pajajaran= 0,26. P 0,07. K 0,12. E 0,54. KPmaks/min; dimana: P= skor fungsi perlindungan dan pengendalian lingkungan, K= skor fungsi konservasi flora dan fauna, E= skor fungsi estetika, KP= skor kesehatan pohon. Jenis pohon dengan skor tingkat kesesuaian paling tinggi diperoleh bunga kupu-kupu dengan nilai 4,15 dan 3,61., The green lane of the road must be able to provide various functions optimally, one of the functions is for environmental conservation. Therefore, trees as the constituent of green lanes need to be evaluated for their level of suitability with environmental conservation functions. This study aims to evaluate the suitability of tree species in environmental conservation based on factors of environmental protection and control functions, flora and fauna conservation, aesthetic, and tree health in the green lane of Jalan Pajajaran, Bogor City. The research procedure includes the formulation of tree function factor criteria, data collection, weighting of criteria using the Analytical Hierarchy Process, preparation of equations to evaluate the suitability of tree species, and determination of the level of suitability. The research produced an equation for evaluating the suitability of tree species in the green lane of Jalan Pajajaran= 0.26. P + 0.07. K + 0.12. E + 0.54. KPmaks/min; where: P= score of environmental protection and control, K= score of flora and fauna conservation, E= score of aesthetic, KP= score of tree health. The tree type with the highest suitability score is butterfly flowers, which is 4,15 & 3,61.
Keyword: jenis pohon, kesesuaian, jalur hijau

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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