Judul: Karakteristik Mikrohabitat, Morfologi dan Kelimpahan Phyton reticulatus Schneider, 1801 di Kebun Sagu, Kabupaten Sambas
Abstrak: Python merupakan salah satu spesies reptil yang dipanen oleh masyarakat setempat untuk tujuan komersial. Panen terbesar ular ini di Kabupaten Sambas sebagian besar berasal dari hutan tanaman rakyat. Penelitian ini bertujuan untuk mengidentifikasi karakteristik habitat mikro, morfologi dan kelimpahan P. reticulatus di perkebunan sagu rakyat di Sambas, Kalimantan Barat yang mendukung keberadaan jenis ini. Pengumpulan data habitat mikro dilakukan dengan menggunakan perangkap di 127 titik pengamatan yang dilaksanakan sejak bulan Februari sampai April 2014. Tiga puluh delapan python ditangkap selama survei. Kehadiran python pada lokasi pengamatan berkorelasi positif dengan kerapatan Metroxylon sago (r = 0.09; p = 0.008; n = 127), Dillenia indica (r = 0,22; p = 0.001; n = 127), Alstonia scholaris (r = 0.11; p = 0.015; n = 127) dan Vitis trifolia (r = 0.18; p = 0.004; n = 127), sedangkan kelembaban udara (r = 0,05; p = 0.008; n = 127), jarak sumber air terdekat (r = 0.20; p = 0.049; n = 127) dan kerapatan Havea brasiliensis (r = 0.04; p = 0.025; n = 127) berkorelasi negatif dengan kehadiran python. Kelas kesesuaian tinggi yang dapat digunakan untuk memprediksi kehadiran python ditandai dengan kelembaban udara berkisar 64-72% dan jarak dengan sumber air terdekat berkisar 10-200 cm, dengan kerapatan vegetasi minimal untuk jenis Metroxylon sago sebanyak 322 batang/ha, Dillenia indica sebanyak 118 batang/ha, Alstonia scholaris sebanyak 77 batang/ha dan Vitis trifolia sebanyak 18 batang/ha. Peluang tertinggi kehadiran python berada pada tingkat kesesuaian habitat sedang dengan penciri kelembaban udara berkisar 68–74% dan jarak air terdekat 10–200 cm. Keberadaan beberapa vegetasi dapat menyediakan habitat untuk berlindung, berkembang biak dan mangsa bagi python. Individu yang tertangkap terdiri dari 36 individu dewasa (94.74%) dan 2 individu muda berjenis kelamin betina (5.26%). Anakan (bayi) dan telur tidak ditemukan selama penelitian berlangsung. Sex ratio yang dihasilkan adalah 1 : 1.375. Hasil penelitian menunjukkan tidak ada perbedaan yang nyata antara ukuran python jantan dan betina yang tertangkap, namun ukuran Snout-Vent Length (SVL) terbesar ditemukan pada jenis kelamin betina sedangkan rata-rata ukuran SVL jantan lebih besar dari SVL betina.
Keyword: Python reticulatus, mikrohabitat, kebun sagu, kelimpahan, morfologi

Judul: Tata Niaga, Karakteristik Habitat dan Parameter Demografi Sanca Batik (Python reticulatus Scheider 1801) yang Dipanen di Propinsi Kalimantan Tengah
Abstrak: Reticulated python (Python reticulatus) has 180.000 heads annual quota. Despite of the commercial use of this species, a good management of the habitat and population is needed for its sustainability. This research was aimed to identify trades, the habitat charactesictics, harvestings, demographyc parameters and morphometry of harvested reticulated python. The research area was within harvesting areas, management authority, snakes collectors and traders in six regency in Central Kalimantan Province. The research method for trades was done by interviewing several actors of management authority, snakes collectors and traders. The habitat was performed by measuring the environment variables at every plot of capturing and nesting habitat, neither the snakes were captured or not. Harvestings, demographyc parameters morphometry variables of harvested snakes at every plot of habitats, catchers and collector were calculated and measured. Descriptive statistical analyzes showed that traders structure were consisted of collectors, middle man and legal permit owner. Kruskal Wallis and Kolmogorov-Smirnov test showed that there was no habitat preference by the reticulated python. Harvesting estimation derived from location of survey was 26.73% at collector stage and about 31.95 % at middle man stage comparing to annual quota of Central Kalimantan Province. Capturing criteria was based on the size of body length, rather than the sex. The sex ratio of captured snakes in collectors was 1:0.72 and middle man was 1:1.07. The age class most captured both in collectors and middle men was the adult male (99% and 89% from all male). This trend occurred because the adult male has a similar size with the young female.
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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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