Judul: Aplikasi Ethepon untuk Meningkatkan Pembentukan Bunga dan Buah Mentimun (Cucumis sativus L.)
Abstrak: Cucumber (Cucumis sativusL.) is a vegetable under the family Cucurbitaceae. The fruit is largely consumed in Indonesia. The formation of cucumber fruit is influenced by the generative phase. Ethepon functions as a plant growth regulators to induce flowering. The purpose of this research was to study the effect of the ethepon application on flowering and fruit formation in cucumbers. Randomized block design (RBD) was used for statistical analysis with ethepon concentration as the main factor. There are five levels of ethepon concentration used is 0 ppm, 31.25ppm, 62.50 ppm, 93.70ppm, and 125 ppm. The variety of cucumber which was usedis Venus. Ethepon treatment tends to preventthe plant from growing tall and the number of leaves.Ethepon concentration tends to increase male and female flowers, and amount of fruit compared with control. Ethepon application produces ratio of male and female flowers, and the ratio of female flower and fruits which fluctuated during the observation periode.
Keyword: growth regulators., flowering, ethepon concentration, Cucurbitaceae

Judul: The Effect of Paclobutazol Consentration and NPK Fertilizer Dose on The Growth and Yield of Cucumber (Cucumis sativus L.)
Abstrak: Permintaan masyarakat terhadap mentimun semakin meningkat. Salah satu usaha untuk meningkatkan produktivitas mentimun yaitu dengan menambahkan zat pengatur tumbuh berupa paclobutrazol dan pupuk NPK. Penelitian ini bertujuan mempelajari pengaruh konsentrasi paclobutrazol dan dosis pupuk NPK terhadap pertumbuhan dan hasil tanaman mentimun, serta interaksi antara kedua perlakuan. Penelitian dilaksanakan di Kecamatan Wanareja, Kabupaten Cilacap, Jawa Tengah pada Januari-April 2023. Percobaan menggunakan rancangan faktorial RKLT dua faktor dengan 3 ulangan. Konsentrasi paclobutrazol sebanyak 5 taraf, 0 mL L-1 air, 0,325 mL L -1 air, 0,375 mL L-1 air, 0,425 mL L-1 air, dan 0,475 mL L-1 air. Dosis pupuk NPK 16:16:16 sebanyak 4 taraf, 0 kg ha -1, 250 kg ha-1, 300 kg ha-1, dan 350 kg ha-1. Hasil pengamatan menunjukkan bahwa tidak terdapat interaksi antara kedua perlakuan. Pemberian paclobutrazol dapat menekan tinggi tanaman, diameter batang, jumlah helai daun, bobot buah per tanaman, dan bobot buah per petak, serta meningkatkankan jumlah bunga betina. Pemberian pupuk NPK dapat meningkatkan tinggi tanaman, diameter batang, jumlah helai daun, jumlah bunga betina, jumlah dan bobot buah per tanaman, serta jumlah dan bobot buah per petak., People's demand for cucumbers is increasing. The efforts to increase cucumber productivity is by adding growth regulators in the form of paclobutrazol and NPK fertilizer. This study aims to study the effect of paclobutrazol concentration and NPK fertilizer dose on the growth and yield of cucumber, as well as the interaction between the two treatments. The research was conducted in Wanareja, Cilacap, Central Java in January-April 2023. The experiment used a two-factor and 3-repeat RKLT factorial design. The concentration of paclobutrazol was 5 levels, 0 mL L-1 water, 0.325 mL L-1 water, 0.375 mL L-1water, 0.425 mL L-1 water , and 0.475 mL L-1 water. The dose of NPK fertilizer 16:16:16 is 4 levels, 0 kg ha -1, 250 kg ha-1, 300 kg ha-1, and 350 kg ha-1. The observations showed that there was no interaction between the two treatments. Applying paclobutrazol can suppress plant height, stem diameter, number of leaf blades, fruit weight per plant, and fruit weight per plot, as well as increase the number of female flowers. Application of NPK fertilizer can increase plant height, stem diameter, number of leaf blades, number of female flowers, number and weight of fruits per plant, and number and weight of fruits per plot.
Keyword: bunga betina, bobot buah, cucurbitaceae, tinggi tanaman

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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