Judul: Supply Chain and Financial Analysis of Monitor Lizard and Cobra Satay Business in DKI Jakarta
Abstrak: Reptil sering dimanfaatkan untuk dikonsumsi karena dipercaya untuk menyembuhkan penyakit. Jenis reptil yang sering dimanfaatkan adalah biawak dan ular kobra. Salah satu bentuk pemanfaatan adalah usaha sate biawak dan ular kobra di DKI Jakarta. Untuk memastikan pemanfaatan yang berkelanjutan, penting untuk melakukan pendekatan terhadap semua elemen dalam rantai pasok serta nilai finansial dalam usaha sate biawak dan ular kobra. Data dikumpulkan dengan metode snowball sampling kepada informan-informan kunci usaha sate biawak dan ular kobra, yakni pedagang, pengumpul dan agen, serta konsumen. Pengumpulan data dilaksanakan pada bulan Juli-Agustus 2023, yang dianalisis secara deskriptif . Hasil penelitian menunjukkan tipologi rantai pasok usaha sate biawak dan ular kobra adalah gatekeeper dengan agen dalam rantai pasok ular kobra dan pengumpul pada rantai pasok biawak sebagai pusat rantai pasok. Biawak dimanfaatkan daging, lemak, dan empedu, sedangkan pada ular kobra dimanfaatkan daging, darah, empedu, tulang, lemak, dan tangkur, yang secara umum bermanfaat untuk obat kulit. Pemasok dan pedagang didominasi oleh jenis kelamin laki-laki dengan umur 19-44 tahun dengan masa kerja sedang (6-10 tahun), untuk usaha biawak dan 45-49 tahun, dengan dominasi tingkat pendidikan SMP dan SMA, serta didominasi motivasi ekonomi. Konsumen didominasi oleh laki-laki, dengan kelompok umur dewasa awal (25-37 tahun). Kelompok pendidikan didominasi SMA, etnis yang dominan adalah jawa dengan agama islam. Pekerjaan dominan adalah wiraswasta, dengan pendapatan tinggi pada konsumen biawak dan sangat tinggi pada konsumen ular kobra. Motivasi konsumen paling tinggi adalah fungsional untuk pengobatan. Serta analisis finansial menunjukkan bahwa usaha sate biawak dan ular kobra layak untuk dilaksanakan
Keyword: cobras, economics, monitor lizards, supply chain, utilization

Judul: Pemanfaatan Reptil Sebagai Obat dan Makanan di Daerah Khusus Ibu Kota (DKI) Jakarta
Abstrak: Economic crisis in Indonesia urge people to utilize natural resources including reptile. Reptile used to be regarded as adverse thing, now becoming profitable comodity for medicine and food. Nowadays, demand for reptile is increasing so that creates more risk for sustainability of reptile because most of reptile hunted from wild. The aim of this research was to know the characteristic of reptile traders and consumers, to know the utilization of reptile as medicine and food products and to investigate reptile trafficking in DKI Jakarta. This research was carried out from November until Desember 2008 in DKI Jakarta. The direct observation and interview to the traders and consumers were be used to collect data. There were ten traders selected by purposive sampling method. Whereas 30 consumers were selected based on the average of daily visitors. Most of traders were Indonesian male with average age of 43 years old and having selling experience for 2-43 years. Most of consumer were Indonesian male with the average of age 34 years old. Their education background were senior high school. There were 13 species (southern Indonesian spitting cobra, king cobra, reticulated python, copperhead racer, mangrove snake, banded krait, Malayan krait, ground pit viper, Indian rat snake, asian water monitor, tockay, skink and southest asian softshell turtle) of reptiles that be used as medicine product (fresh blood, salve, capsule, cream, oil, dried gall bladder, dried male genital and powder). There were 7 species (southern indonesian spitting cobra, reticulated python, crocodile, asian water monitor, tockay, skink and southest asian softshell turtle) were used for food products (roasted meat, soup, frieds meat and fried meat powder). Reptile trafficking in DKI Jakarta was divided into 2 networking system, which are: 1) small scale trader (wild reptiles- hunters - primary collectors - secondary collectors - small scale traders - consumer) and 2) large scale trader (wild reptiles - hunters - primary collectors – small scale productions - large scale traders - consumers). People usually utilize reptile for treating skin diseases. It is necessary to control reptile hunting in order to prevent those species from extinction. Breeding in captivity is on off alternatives to reduce hunting of reptile from the wild. Formal monitoring and regulation in reptile utilization by BKSDA DKI Jakarta, monitoring and contolling by BPOM DKI Jakarta as well as research on bioactive content in reptile meat
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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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