Judul: Identification of Fruit Fly and Effectiveness of Black Tea Tree and Basil  Extract as Fruit Fly Attractans in Guava and Star Fruit Orchards in Bogor.
Abstrak: Lalat buah Bactrocera dorsalis kompleks (Diptera: Tephritidae) merupakan hama utama pada berbagai komoditas hortikultura di berbagai Negara. Lalat buah B. dorsalis kompleks merupakan kelompok lalat buah dari genus Bactrocera yang memiliki karakter morfologi yang hampir sama dengan B. dorsalis (Hendel). Lalat buah B. dorsalis kompleks terdiri dari 54 spesies. Untuk membedakan spesies lalat buah yang termasuk ke dalam B. dorsalis kompleks dapat dilakukan dengan berbagai metode seperti membandingkan karakter morfologi, morfometrik pada organ genital, dan menggunakan sekuen DNA. Metode identifikasi yang menjadi pilihan utama hingga saat ini adalah dengan metode indentifikasi berdasarkan karakter morfologi. Jambu biji dan belimbing merupakan komoditas buah-buahan yang populer dibudidayakan di Bogor, Jawa Barat. Varietas jambu biji yang populer dibudidayakan adalah Getas Merah dan varietas belimbing yang populer dibudidayakan adalah Dewa. Salah satu faktor pembatas produksi buah jambu biji dan belimbing adalah kehilangan hasil akibat lalat buah B. dorsalis kompleks. Salah satu alternatif pengendalian lalat buah yang efektif, efisien, dan ramah lingkungan adalah dengan menggunakan atraktan berbahan aktif metil eugenol. Lalat buah jantan di alam memanfaatkan metil eugenol sebagai bahan dasar feromon untuk memikat lalat buah betina. Metil eugenol di alam dapat diperoleh dari berbagai tumbuhan di antaranya Melaleuca bracteata (Myrtales: Myrtaceae) atau daun wangi dan Ocimum sp. (Lamiales: Lamiaceae) atau selasih. Kendala yang dihadapi petani dalam pengolahan daun wangi dan selasih sebagai bahan dasar metil eugenol adalah teknologi untuk menghasilkan minyak esensial dalam jumlah besar. Rendemen minyak yang dihasilkan kedua tanaman tersebut hanya di bawah 2%, sehingga minyak yang dihasilkan dari proses distilasi hanya sedikit. Hal ini dapat diatasi dengan memanfaatkan hasil sampingan dari proses distilasi yaitu air distilasi dan memanfaatkan remasan daun tanaman daun wangi dan selasih. Selain itu dapat juga dilakukan pengenceran minyak esensial daun wangi dan selasih., Fruit fly of Bactrocera dorsalis complex (Diptera: Tephritidae) is the main pest on several horticultural comodities on several countries. B. dorslis complex is a group of fruit flies consisting of 54 species. The grouping is based on morphological characters between one species and another species is almost the same. Methods for the identification of B. dorsalis complex species can be done by several methods, such as comparing the morphological, morphometric in the genital organs, and using of DNA sequences. Identification method based on morphological characters is still become the main option to identify species of B. dorsalis complex. Guava and starfruit is a popular fruits commodity cultivated in Bogor, West Java. Popular guava varieties cultivated in Bogor is Getas Merah and popular varieties of star fruit is Dewa. One of the limiting factors for guava and starfruit production are yield losses due to B. dorsalis complex. Effective, efficient, and environmentally friendly fruit fly control can be done by applying methyl eugenol as a fuit fly attractan. Male fruit fly in the nature using methyl eugenol as a substrate for making pheromon to attract female. Methyl eugenol can be obatined from Melaleuca bracteata (Myrtales: Myrtaceae) or black tea tree and Ocimum sp. (Lamiales: Lamiaceae) or basil. To obtain methyl eugenol essential oil from both plants can be done by distillation process. The limiting factors that occured on farmers
Keyword: Attractan, Basil, Black tea tree, fruit fly, leaf ekstacts, Fruit flies, Bactrocera dorsalis, Tephritidae, Ocimum sp

Judul: Keanekaragaman, persebaran dan kunci identifikasi lalat buah (Diptera: Tephritidae) di Kabupaten Bogor dan sekitarnya
Abstrak: Fruit flies are the most important pests for many fruits and vegetables which cause quantitative and qualitative losses of production. Bogor and its surrounding area have many fruit fly host plants. The aim of this research was to investigate the diversity and distribution of fruit flies species and their hosts at Bogor and its surrounding area as well as constructing the identification key for found species. Fruit flies were collected at 119 sampling areas in Bogor and some places of Cianjur, Bekasi and Depok. Collection of samples were using 2 methods: host rearing and trapping. Modification of Lynfield trap and 2 attractants such as metil eugenol (ME) and Cue lure (CL) were used in the trapping. There were 18 species of fruit flies collected from traps and 23 host plants. Distribution, diversity and abundance of fruit flies was influenced by the diversity of host plants.
Keyword: 

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.
Keyword: