Judul: Konservasi Spesies Kunci Budaya Masyarakat Desa Kalipait di Sekitar Taman Nasional Alas Purwo, Jawa Timur.
Abstrak: Species whose existence and symbolic value are essential to the stability of a cultural group over time is defined as Cultural Keystone Species (CKS). This research assessed the use and value of CKS in the community of Kalipait Village, surrounding Alas Purwo National Park (APNP. Data were collected through indepth interview and direct field observation. Once interviews and literature review were completed, the preliminary list of cultural keystone species was assessed using an Index of Identified Cultural Influence (ICI), to identify potential CKS regarding intensity and variation of use, persistence in memory, symbolism within narratives of ceremony and the degree to which it is irreplaceable by similiar native species. The Kalipait people were identified with CKS which were exceptionally important to their daily lives, i.e., 5 species of flora and 1 species fauna. Rice (Oryza sativa), coconut (Cocos nucifera), and poultry (Gallus domesticus) were CKS that cultivated by the people, while manon (Helminthostachys zeylanica), bamboo (Bambusa spinosa), and stigi (Pemphis acidula) were gathered from inside APNP. The CKS gathered from inside APNP caused decrease of population and damage to growing place, so that conservation efforts that can be done is vegetative cultivation.
Keyword: Alas Purwo national park, conservation, cultural keystone species

Judul: Local Wisdom of the Sentarum Lake Community in an  Effort to Conserve Lutung Sentarum (Presbytis chrysomelas ssp cruciger).
Abstrak: Kearifan lokal masyarakat Danau Sentarum dapat menunjang konservasi Lutung Sentarum yang berstatus critically endangered (CR). Penelitian ini mengidentifikasi dan menilai unsur budaya dan jenis kearifan lokal masyarakat tersebut dalam kelestarian Lutung Sentarum, serta mengidentifikasi dinamika perubahan dalam kearifan lokal. Pengambilan data yaitu wawancara dilakukan dengan metode snowball yang di mulai dari kepala pemerintah dan kepala adat. Beberapa unsur budaya yang berperan dalam konservasi Lutung Sentarum yaitu sistem bahasa, sistem mata pencaharian, sistem religi, sistem sosial keluarga. Dinamika perubahan mitos, tempat tinggal, dan perburuan berdampak pula terhadap kelestarian Lutung Sentarum. Dampak baik dari perubahan yang terjadi dapat mengurangi perambahan hutan yang menjadi habitat Lutung Sentarum. Nilai kearifan lokal muncul dalam kehidupan masyarakat seperti nilai pengetahuan dan mitos dalam upaya pelestarian sumberdaya hayati. Selain itu terdapat anjuran dan larangan pada masyarakat lokal yang mendukung konservasi Lutung Sentarum. Persepsi masyarakat lokal yang mendukung segala upaya pelestarian Lutung Sentarum sangat penting untuk mendukung dan menjelaskan seberapa pentingnya Lutung Sentarum di lingkungan tempat tinggal masyarakat tradisional. Kata kunci : Dinamika, kearifan lokal, Lutung Sentarum , unsur budaya, The local wisdom of the people of Danau Sentarum can support the conservation of the critically endangered (CR) Sentarum langurs. This research identify and assess cultural elements and types of local wisdom in the preservation of Sentarum langurs, as well as identify the dynamics of change in local wisdom. Data collection, interviews using the snowball method starting from the head of the government and the customary head. Some cultural elements play a role in the conservation of Sentarum langurs are the language system, livelihood system, religious system, and family social system. The dynamics of changes in myths, residence, and hunting also have an impact on the conservation of Sentarum langurs. The good impact is can reduce forest encroachment which is the habitat of Sentarum langurs. The value of local wisdom appears in people's lives such as the value of knowledge and myths in efforts to conserve biological resources. In addition, there are recommendations and prohibitions in local communities that support the conservation of Sentarum langurs. The perception of local communities that support conserve Sentarum Sentarum is very important to support and explain how important Sentarum langurs are in the environment where traditional communities live. Keywords: cultural elements, dynamics, local wisdom, Sentarum langurs.
Keyword: Kearifan Lokal, Konservasi, Lutung sentarum, cultural elements, dynamics, local wisdom, Sentarum langurs

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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