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: Kajian Pengaruh Iradiasi Sinar Gamma Mortalitas Lalat Buah Dan Mutu Buah Mangga Gedong (Mangifera indica. L) Selama Penyimpanan
Abstrak: Mango cv. gedong is one of the potencial horticultural product to be exported, but mango is a host of fruit flies (Bactrocera dorsalis) that causing constrain with the quarantine regulation. Therefore, it need treatment to kill the fruit flies that invested inside the mango. Irradiaton treatment is one of disinfestation technique to kill the fruit flies add and keep fruit quality during storage. This research objective was to study the effect of irradiation gamma rays on fruit flies mortality and mango quality during storage. The doses at 0.25 kGy, 0.5 kGy, 0.75 kGy were used for mortality test on fruit flies invested mango. To see the effect of respiration and quality, the fruit were stored at 8, 13, 28 ºC (irradiation and control). The result shows that mortality of fruit flies B. papayae with the dose of 0.75 kGy reach 100%. Irradiation on the mango can decrease the growth of fruit fly, while on the control of manggo the fruit fly has been detected on the days 9th. The irradiotion treatment until the dose of 0.75 kGy is ineffective to eradicate the fruit fly that being infestations inside the mango, however, at 21 days of storage the fruit fly is still detected. The irradiation treatment with the dose of 0.75 kGy decrease respiration and postpone the fruit ripening also maintain the fruit quality based on the weight losses, the vitamin C content, total acid, TPT, and water content.
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Judul: Aproksimasi Fungsi Sinus dan Kosinus sebagai Kombinasi Linear dari Fungsi Eksponensial
Abstrak: Salah satu gagasan yang menarik dalam matematika adalah aproksimasi suatu fungsi oleh fungsi lain. Sebagai contoh, fungsi polinom dapat diaproksimasi menggunakan deret Taylor atau fungsi persamaan diferensial dapat diaproksimasi menggunakan deret Fourier. Adapun fungsi yang dapat mengaproksimasi fungsi lain salah satunya adalah fungsi eksponensial. Kemungkinan mengaproksimasi fungsi dengan kombinasi linear dari fungsi eksponensial dari bentuk eˣ, e²ˣ, ... dianggap sebagai perkembangan sejajar dengan gagasan Deret Taylor yang mengaproksimasi fungsi dengan kombinasi linear dari segi fungsi kuadrat. Fungsi sin x dan cos x digunakan sebagai target untuk menilai seberapa baik aproksimasi yang dilakukan oleh fungsi yang diberikan. Aproksimasi fungsi sinus dan kosinus menggunakan hampiran Taylor lebih akurat dibandingkan dengan aproksimasi menggunakan fungsi eksponensial.
Keyword: Aprosimaksi eksponensial, aproksimasi fungsi, aprosimaksi Taylor, fungsi eksponensial