Judul: The Utilization of Sycanus sp. (Hemiptera: Reduviidae)  for Pest Control.
Abstrak: Sycanus sp. (Hemiptera: Reduviidae) merupakan serangga predator yang dapat ditemukan di berbagai macam habitat seperti perkebunan, pertanaman hortikultura, tanaman pangan, dan kehutanan. Predator ini bersifat polifag karena memiliki kisaran mangsa yang luas seperti Lepidoptera, Hemiptera, Diptera, dan Coleoptera. Sycanus sp. memiliki kelebihan seperti mudah dikembangkan di laboratorium, mempunyai siklus hidup yang relatif panjang, dan berperan sebagai predator di semua stadia perkembangan mulai dari fase pradewasa sampai dewasa. Studi pustaka ini bertujuan menghimpun infromasi mendalam tentang pemanfaatan serta potensi Sycanus sp. dalam pengendalian serangga hama. Tahapan penulisan terdiri dari perumusan masalah, pengumpulan data, analisis dan sintesis serta pembuatan simpulan dan saran. Hasil dari studi pustaka menunjukkan bahwa keberhasilan pemangsaan hama oleh Sycanus sp. terbukti dengan menurunnya populasi hama Strepsicrates sp. di pertanaman Melaleuca sp. di daerah Riau. Contoh lain pemanfaatan Sycanus sp. yaitu pada pertanaman Acacia mangium yang dapat megurangi kerusakan yang disebabkan oleh hama Helopeltis sp. sebanyak 20%. Dari contoh kasus-kasus tersebut, disimpulkan bahwa Sycanus sp. dapat dikembangkan sebagai predator yang berpotensi untuk menekan populasi berbagai hama dengan memperhatikan teknik implementasi yang tepat., Sycanus sp. (Hemiptera: Reduviidae) is predatory insect that can be found in a variety of habitats such as plantations, horticulture, food crops, and forestry. These predators are polypags because they have a wide range of prey such as Lepidoptera, Hemiptera, Diptera, and Coleoptera. Sycanus sp. has such advantages as easy to develop in the laboratory, has a relatively long life cycle, and acts as a predator in all stages of development from the adult to the adult phase. This literature study aims to gather in-depth information on the use and potential of Sycanus sp. in the control of insect pests. The writing stage consists of problem formulation, data collection, analysis and synthesis as well as making conclusions and recommendations. The results of the literature study show that the success of pest predation by Sycanus sp. evidenced by a decrease in the population of pests Strepsicrates sp. in Melaleuca sp. in the Riau area. Another example of the use of Sycanus sp. namely on the cultivation of Acacia mangium which can reduce the damage caused by the pest Helopeltis sp. as much as 20%. From the examples of these cases, it is concluded that Sycanus sp. can be developed as a potential predator to suppress the population of various pests by paying attention to proper implementation techniques.
Keyword: pest management, predator insect, Sycanus sp.

Judul: Persebaran dan kelimpahan kepik predator Sycanus sp. (Hemiptera: Reduviidae) pada komoditas padi dan wortel di Daerah Cianjur, Garut, Pangalengan dan Bogor, Jawa Barat
Abstrak: Sycanus sp. merupakan salah satu spesies dari kepik predator famili Reduvidae yang banyak terdapat di Indonesia pada berbagai agroekosistem. Persebaran populasi di daerah Jawa Barat dan faktor lingkungan yang mendukung perkembangbiakannya belum diketahui. Penelitian ini bertujuan menentukan persebaran dan kelimpahan populasi kepik predator Sycanus sp. di daerah Garut, Pangalengan dan Bogor.
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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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