Judul: Checklist of Gall-Inducing Insect in Indonesia
Abstrak: Daftar serangga penting untuk mengetahui keberadaan serangga pada suatu negara atau wilayah secara komprehensif. Pembuatan daftar dilakukan dengan mengumpulkan dan menyatukan literatur penelitian dari berbagai sumber. Daftar puru tumbuhan di Indonesia secara keseluruhan terakhir kali dipublikasikan oleh van Leeuwen-Reijnvaan dan van Leeuwen pada tahun 1941. Penelitian ini melengkapi informasi daftar puru tumbuhan dengan penelitian-penelitian baru termasuk memperbarui data taksonomi berbagai spesies serangga dan tumbuhan. Penelitian ini dilakukan di Laboratorium Biosistematika serangga. Metode penelitian yang digunakan adalah studi pustaka. Pengolahan data menggunakan teknik analisis model Miles and Huberman yaitu data reduction, data display, dan conclusion drawing/verification. Analisis data menggunakan analisis deskriptif dengan menampilkan gambar, daftar, tabel dan diagram. Hasil yang diharapkan yaitu mendapatkan informasi yang lebih lengkap terkait daftar serangga penyebab puru di Indonesia, Insect checklist or a list of insects is important to comprehensively understand the existence of insects in a particular region or country. Checklists are made by collating information from various sources and literature. The last checklist covering plant gall across Indonesia was published by van LeeuwenReijnvaan and van Leeuwen in 1941. This research updates the existing data with various research that had been conducted since then. The updates also include the latest taxonomic status of various insects and plants. This research was conducted at the Insect Biosystematics Laboratory. The research method used is literature study. Data processing uses Miles and Huberman model analysis techniques, namely data reduction, data display, and conclusion drawing / verification. Data analysis uses descriptive analysis by displaying images, lists, tables and diagrams. The expected result is to get more complete information related to checklist of insects that cause puru in Indonesia.
Keyword: checklist, literature study, plant gall

Judul: Literature Study of Soft Scale Insects Species (Hemiptera: Coccidae) and Armored Scale Insects Species (Hemiptera: Diaspididae) and Its Host Plants in Indonesia
Abstrak: Penelitian lapangan mengenai spesies serangga Famili Coccidae dan Diaspididae telah banyak dilakukan di Indonesia. Namun, penelitian studi literatur yang menghimpun seluruh spesies serangga Famili Coccidae dan Diaspididae yang pernah dilaporkan di Indonesia dan tumbuhan inangnya hingga saat ini belum tersedia. Penelitian bertujuan memberikan checklist terbaru serangga Famili Coccidae dan Diaspididae yang dilaporkan di Indonesia. Studi literatur ini diharapkan dapat memberikan informasi tentang spesies-spesies serangga Famili Coccidae dan Diaspididae, tumbuhan inang, dan distribusinya di Indonesia. Informasi tersebut harapannya dapat berguna sebagai evaluasi dan perkiraan arah penelitian mengenai serangga Famili Coccidae dan Diaspididae di masa yang akan datang. Hasil penelitian menunjukkan bahwa jumlah coccid di Indonesia mencapai 66 spesies dari 4 subfamili, 8 tribe, dan 22 genus. Sementara itu, jumlah diaspid di Indonesia mencapai 119 spesies dari 2 subfamili, 6 tribe, dan 47 genus. Distribusi coccid dan diaspid paling banyak ditemukan di Pulau Jawa, yaitu sebanyak 29 spesies dan 67 spesies. Tumbuhan inang serangga coccid terdiri dari 69 spesies dari 31 famili sedangkan tumbuhan inang serangga diaspid terdiri dari 45 spesies dari 120 famili yang menjadi inangnya di Indonesia. Selain itu, coccid dan diaspid di Indonesia diketahui memiliki kisaran inang yang polifag. Hal ini menandakan bahwa coccid dan diaspid merupakan serangga hama yang harus diwaspadai keberadaannya di Indonesia, karena sangat berpotensi menyebabkan kerusakan yang cukup signifikan., Field research on insect species of the Coccidae and Diaspididae families has been widely conducted in Indonesia. However, literature studies that compile all species of insect families Coccidae and Diaspididae that have been reported in Indonesia and their host plants are not yet available. The study aims to provide an updated checklist of insect families Coccidae and Diaspididae reported in Indonesia. This literature study is expected to provide information on insect species of the Coccidae and Diaspididae families, host plants, and their distribution in Indonesia. The information is expected to be useful for evaluating and estimating the direction of research on insect families Coccidae and Diaspididae in the future. The results showed that the number of coccids in Indonesia reached 66 species from 4 subfamilies, 8 tribes, and 22 genera. Meanwhile, the number of diaspids in Indonesia reached 119 species from 2 subfamilies, 6 tribes, and 47 genera. The distribution of coccids and diaspids is mostly found in Java Island, with 29 species and 67 species, respectively. Host plants of coccid insects consist of 69 species from 31 families while host plants of diaspid insects consist of 45 species from 120 families in Indonesia. In addition, coccids and diaspids in Indonesia are known to have a polyphagous host range. This indicates that coccids and diaspids are insect pests that must be watched out for in Indonesia, as they have the potential to cause considerable damage.
Keyword: distribution, soft scale insects, armored scale insects, host plants

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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