Judul: The Effect of Auxin and Rooting Induction Media on Grape Vines Cuttings (Vitis vinifera L.)
Abstrak: Percobaan bertujuan mempelajari pengaruh pemberian auksin dan media induksi pengakaran pada stek tanaman anggur. Pelaksanaan percobaan dilakukan pada akhir bulan Maret hingga Juni 2021 di Dinas Pertanian dan Peternakan Kota Pekalongan. Percobaan dilakukan dengan rancangan acak lengkap dengan dua faktor. Faktor pertama adalah perlakuan auksin yaitu: tanpa auksin, Rootone F dan NAA+IBA. Faktor kedua adalah Jenis media yang terdiri atas media tanah dan kertas. Hasil percobaan menunjukkan bahwa auksin tidak berpengaruh terhadap persentase keberhasilan dan pertumbuhan stek anggur. Jenis media berpengaruh terhadap panjang akar dan jumlah akar, namun tidak berpengaruh terhadap persentase keberhasilan dan waktu tumbuh akar., The study aims to determine the effect of auxin and rooting induction media on grape vines cuttings. The experiment was conducted in March 2021 to June 2021 at the Department of Agriculture and Livestock of Pekalongan City. The study used an experimental method with a completely randomized design with two factors. First factor is a type of auxin which consist: without auxin, Rootone F and NAA+IBA. Second factor is the type of media consisting of soil and paper media. The results showed that auxin had no effect on the percentage of success and growth of grape vines cuttings. The media had an effect on root length and number of roots, but had no effect on the percentage of success and root growth time.
Keyword: NAA+IBA, paper, Rootone F, soil

Judul: Pengaruh Zat Pengatur Tumbuh NAA dan IBA terhadap Pembentukan Akar dan Tunas Stek Jeruk Pamelo (Citrus grandis (L.) Osbeck).
Abstrak: The objective of this research was to study the effect of application of NAA and IBA on pummelo stem cuttings. This research was arranged in split plot design with two factors and five replications. The type of auxin (NAA and IBA) as the main plot. The concentration of auxin (0 ppm, 100 ppm, 150 ppm, 200 ppm, and 250 ppm) as the subplot. The result showed that the type of auxin was affected on rooting percentage, but did not affected on the other parameters. The type of auxin IBA had greater rooting percentage than NAA on pummelo cuttings. The auxin concentration had significant effect on the percentage of callusing, rooting, sprouting, and rooting-sprouting. The auxin concentration also affected on root length, root diameter, shoot length, and shoot diameter, but did not affected on roots and shoots number. The result showed that the auxin concentration 200 ppm with soaking method was the best concentration on root and shoot formation in pummelo cuttings.
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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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