Judul: Keefektifan Iradiasi Sinar Gamma Terhadap Bactrocera Carambolae (Drew & Hancock) In Vitro Dan In Vivo
Abstrak: Jambu biji (Psidium guajava L.) merupakan komoditas hortikultura yang memiliki nilai ekonomis penting dalam pasar lokal maupun ekspor. Dalam rangka akselerasi ekspor, Indonesia harus memenuhi ketentuan yang ditetapkan oleh World Trade Organization-Sanitary and Phytosanitary (WTO-SPS). Salah satu OPT pada komoditas jambu biji adalah Bactrocera carambolae (Drew & Hancock). Salah satu upaya membebaskan komoditas ekspor dari OPT melalui tindakan perlakuan karantina berupa iradiasi sinar gamma [60Co]. Penelitian ini bertujuan menentukan dosis lethal dan dosis efektif iradiasi sinar gamma [60Co] untuk mengeradikasi lalat buah B. carambolae, serta mengamati implikasi terhadap keloloshidupannya. Penelitian ini dilakukan di di Laboratorium Phytosanitary, Pusat Aplikasi Isotop Radiasi-Badan Tenaga Nuklir Nasional (PAIR-Batan), Jakarta pada bulan Agustus sampai dengan Desember 2014. Pelaksanaan penelitian meliputi metode pengujian in vitro dan in vivo, masing-masing diaplikasikan terhadap telur dan larva instar 3 B. carambolae hasil perbanyakan laboratorium. Sebelas dosis perlakuan iradiasi diaplikasikan berturut-turut: 0, 30, 50, 75, 100, 125, 150, 175, 200, 300, 450, dan 600 Gy. Tingkat mortalitas 99% (LD99) ditentukan melalui program probit, dan kemampuan keloloshidupan larva, pupa, dan imago dibedakan melalui uji Tukey pada taraf 5%. Hasil perlakuan menunjukkan bahwa dosis lethal iradiasi efektif pada tingkat (LD99) berhasil mengeradikasi telur dan larva instar 3 berturut-turut sebesar 2225 dan 2343 Gy in vitro, serta 3165 dan 3177 Gy in vivo. Hampir seluruh larva perlakuan yang lolos hidup berhasil berkembang menjadi pupa, namun hanya dosis iradiasi terendah, yaitu 30 Gy saja yang dapat berkembang menjadi imago.
Keyword: Bactrocera carambolae, eradikasi, iradiasi, LD99

Judul: Dosis minimum iradiasi gamma untuk perlakuan karantina terhadap bactrocera papayae (Drew & Hancock) (Diptera: Tephritidae)
Abstrak: Bactrocera papayae is one of the most important fruit flies which is distributed in several countries of Asia and Papua New Guinea, including Indonesia. This fly has been given attention, particularly on the international trade of the agricultural commodities, because it carry a risk of entry and spread pest to free area. A quarantine treatment of gamma irradiation is suggested to alter a common chemical fumigation such as methyl bromide (MB). The objective of this research was to determine a minimum dose of 60Cobalt gamma rays applied on egg and larval stages of this fly that were maintained on the artificial diet in-vitro. There were two kind of treatments. First, egg, first instar larvae, second instar larvae, and third instar larvae were irradiated at six level of doses 0 (control), 25, 50, 75, 100, 125 and 150 Gy. Second, the most tolerant stage of the fly based on first treatment, were irradiated at nine level of doses 10, 20, 40, 60, 80, 100, 120, and 150 Gy including control. Our result showed that the third instar was the most tolerant stage of the fly to irradiation treatment. The minimum quarantine dose of irradiation to eradicate the third instar was 114.76 Gy.
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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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