Judul: Pengaruh Pengeringan, Media Pengujian, Waktu Panen dan Kondisi Ruang Simpan terhadap Viabilitas Serbuk Sari Mentimun (Cucumis sativus L.).
Abstrak: The objectives of this research were to study the decline of cucurbits pollen viability during desiccation, to determine the suitable germination medium for cucumber pollen, to determine the best time for pollen harvesting and to study thestorability of Cucumis sativus pollen. The study was carried out during March- August 2011 at Production Farm and Pollen Laboratory, PT East West Seed Indonesia in Jember, East Java. Viability of pollen harvested on the day of anthesis decreased after anther drying in air-conditioned room for 24 hours and decreased further after pollen drying in MgCl2 for 24 hours. Viability of pollen harvested one day before anthesis increased after anther drying in airconditioned room for 24 hours, then decreased after drying in MgCl2 for 24 hours. PGM 1, PGM 2 (modified from the original), Brewbacker and Kwack (BK), E1, and E2 were pollen germination medium used in this experiment. The male parental stock of KE010, KE014, KE018, and KE019 were used as the pollen source. The result showed that KE014 pollen germinated in PGM 1 had higher germination than BK, on the first trial. In the second trial, PGM 1 also showed higher germination than E2. Pollen of KE010, KE018, and KE019 germinated in PGM 2 produced higher germination than PGM 1 in in the third trial. The pollen harvesting was done at 07.00, 09.00, 11.00, 13.00, 15.00, 17.00 one day before anthesis and on the day of anthesis (A-1 and A) on KE010, KE018, KE019. The result showed that the best time for pollen harvesting for the three varieties was during 07.00-11.00 on the day of anthesis with viability at about 35%. The storage conditions under investigation for cucumber pollen were freezer, deep freezer, and ultra freezer. The most suitable storage condition for cucumber pollen (KE010, KE018, KE019) was ultra freezer, in which viability of cucumber pollen more than 1% would keep for 42 HSS (6 weeks), 90 HSS (12 weeks), 9 HSS (1.5 weeks) without any significant decline on germination.
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Judul: Potensi Penyimpanan Serbuk Sari dalam Produksi Benih Hibrida Mentimun (Cucumis sativus L.) Varietas KE014
Abstrak: High pollen viability with adequate quantity determine yield of hybrid seed production. Stored pollen with high viability is expected to produce high quantity and quality of hybrid seed . The aims of this research was to study the possibility of using stored pollen in hybrid seed production of cucumber (Cucumis sativus L.). The research was conducted in Pollen Laboratory, screen house (SH), and experimental station of PT. East West Seed Indonesia, Gumuk Segawe village, Ajung subdistrict, Jember, East Java from March until August 2011. The research was started with observation on the timing of receptive stigma based on color changes of petal and stigmatic surface every hour during which time pollination was also conducted. Percentage of fruit set and seed set from each pollination were observed. The research then continued with experiments conducted in the field and SH separately. The experiment was arranged in completely randomized block design with 10 treatments in the field and 13 treatments in SH. The treatments for field experiment were combination of storage periode (0, 20, 30 and 40 DAS) and pollination technique (1, 2, 3 times swabbing). The storage periode for SH experiment were 0, 7, 14 and 28 DAS. The treatments were repeated 3 times. The result showed that the stigma was receptive during 07.00–13.00 h. The viability of stored pollen 20-40 DAS ranged between 0.8–4 % whereas 7-28 DAS ranged between 4.8-9.71%. Fruit set from stored pollen ranged 21.23-42.42 % and seed set ranged 16.89-25.26 % in the field compared to use of fresh pollen 54.64 and 59.26 % respectively. As for SH the fruit set ranged 30.69-63.98 % and seed set ranged 18.22–35.68 % from stored pollen compared 73.56 % and 80.69 % from fresh pollen. Reproductive succes of stored pollen in the field ranged 12.82–29.29 % with averaged of 19.89 % compared to that of fresh pollen, whereas in the SH used of stored pollen resulted in 10.60-25.29 %, averaged 18.89 % reproductive succes.
Keyword: stigma receptivity, seed quality, seed set, pollen viability, empty seed

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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