Judul: Proyeksi Anomali Perilaku Stereotipe Monyet Ekor Panjang (Macaca fascicularis) Sitaan sebagai Hewan Model Neuropsikopatologi.
Abstrak: This study was dedicated to the development of the use and conservation policy of confiscated long-tailed macaques (Macaca fascicularis, cynomulgus macaques) in Jakarta Province. The macaques that have proven healthy physically and mentally will be returned to their natural habitat. However there were no behavioral assessments data and alternatives to utilize these mentally unhealthy macaques. For this purpose, we constructed behavioral assessments and explored the alternatives of animal use in scientific purposes. Among the 47 macaques observed using instantaneous or scan sampling recording method, three macaques were noted having stereotypical anomalies behavior such as, weaving, rocking, and hand-biting. The monkeys were housed into two types of housing that we considered as stable and unstable social housing. Based on literature studies, the suppression of stereotypical anomalies behavior in monkeys are almost impossible in unstable social housing and stereotypical anomalies behavior are observed in some human conditions which considered as neuropsychopathology cases. Due to this similarity, we concluded that Macaca fascicularis could develop as animal model for neuropsychopathology.
Keyword: Macaca fascicularis, stereotypical anomalies behaviour, neuropsychopathology

Judul: Karakter Dominansi dan Perilaku Stereotipe pada Monyet Ekor Panjang (Macaca fascicularis) Sitaan serta Saran-saran Pengelolaannya.
Abstrak: This study is dedicated to support the behavioural management of confiscated dancing monkeys of cynomolgus macaques (Macaca fascicularis) at UPT Pusat Pelayanan Kesehatan Hewan Jakarta province. This management is to improve animal welfare and rehabilitate stereotypical anomaly behaviour. Therefore cages condition and behaviour of 47 confiscated monkeys were observed using instantaneous sampling method. The cages condition include 4 socially stable cages and 2 socially unstable cages. Dominant characteristic is found in both type of cages where at socially unstable cages shows higher frequency of aggressive behaviour. The stereotypical behaviour movement of head left to right (weaving) only found in socially unstable cage. Movement of head front to back (rocking) found in both cages and self-injurious behaviour (SIB) found in socially stable cages. In managing the dynamics and rehabilitate the abnormal behaviour mentioned above, it is found that environmental enrichment is needed. This includes social enrichment, occupational enrichment, physical enrichment, sensory enrichment, and nutrition enrichment. It is hope that these information will be the guideline in managing dominant character of confiscated monkeys and its stereotypical behaviour.
Keyword: dominant, environmental enrichment, macaca fascicularis, stereotypies

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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