Judul: Development of Soybean (Glycine max (L.)) Seed Viability Test Method using Urine Sugar Analysis Paper (USAP)
Abstrak: Kedelai (Glycine max (L.)) merupakan salah satu komoditas utama selain padi dan jagung di Indonesia. Permasalahan yang dihadapi dalam penyediaan benih kedelai bermutu adalah daya simpan benih kedelai yang pendek. Penelitian bertujuan mengembangkan metode uji vigor benih menggunakan urine sugar analysis paper (USAP) pada berbagai tingkat vigor benih kedelai yang diperoleh dari metode pengusangan cepat. Percobaan disusun menggunakan rancangan acak lengkap (RAL) satu faktor dengan empat ulangan yang terdiri dari dua percobaan. Percobaan pertama adalah metode pengusangan cepat bersuhu 40 C dan RH 95%. Percobaan kedua adalah mengembangkan metode urine sugar analysis paper terhadap lot benih yang diperoleh dari pengusangan cepat dengan menentukan lama perendaman benih yang efisien dengan taraf 1, 3, dan 5 jam. Percobaan dilakukan terhadap dua varietas secara terpisah yaitu varietas Anjasmoro dan Gepak kuning. Hasil penelitian menunjukkan pengusangan cepat dapat menurunkan vigor dan viabilitas benih kedelai. Pada varietas Anjasmoro, lama perendaman 5 jam merupakan metode efektif untuk pengujian kebocoran glukosa dan protein yang berkorelasi kuat dengan tolok ukur daya kerkecambah, kecepatan tumbuh, dan nilai daya hantar listrik. Pada varietas Gepak kuning, lama perendaman 1 jam merupakan metode efektif untuk pengujian kebocoran glukosa dan protein yang berkorelasi kuat dengan tolok ukur daya berkecambah dan nilai daya hantar listrik., Soybean (Glycine max (L.)) is one of the main commodities besides paddy and corn in Indonesia. The problem faced in providing good quality of soybean seeds is the short shelf life of soybean seeds. This research aims to develop a seed vigor test method using Urine Sugar Analysis Paper (USAP) at various levels of soybean seed vigor, that was obtained from the Accelerated Aging Method. The experimental design that used in this research was a Completely Randomized Design (CRD) one factor with four replications consisting of two trials. The first experiment was the accelerated aging using the Accelerated Aging Method (AAM) at a temperature of 40 °C. The second experiment was to develop an Urine Sugar Analysis Paper method on seed lots that was obtained from accelerated aging by determining the efficient soaking time of seeds at levels of 1, 3, and 5 hours. Experiments were carried out on two varieties separately, namely Anjasmoro and Gepak kuning varieties. The results showed that accelerated aging could reduce the vigor and viability of soybean seeds. For the Anjasmoro variety, 5 hours of soaking time is an effective method for testing glucose and protein leakage which is strongly correlated with germination, growth seed, and electrical conductivity. For the Gepak kuning variety, 1 hour of soaking time is an effective method for testing glucose and protein leakage which is strongly correlated with germination and electrical conductivity.
Keyword: accelerated aging, vigor, correlation, glucose, protein, pH

Judul: Development of Rapid Viability Test Method for Long Bean (Vigna sinensis L.) Seed Using Urine Sugar Analysis Paper
Abstrak: Kacang panjang merupakan komoditas dengan permintaan benih yang tinggi sehingga perlu dikembangkan metode pengujian viabilitas yang cepat dan murah. Urine sugar analysis paper (USAP) merupakan kertas yang mampu menganalisis kandungan glukosa, protein, dan pH dalam suatu larutan. Penelitian bertujuan mengembangkan metode pengujian viabilitas benih kacang panjang (Vigna sinensis L.) secara cepat menggunakan USAP pada tingkat viabilitas dan vigor yang berbeda dari hasil pengusangan cepat. Percobaan terdiri atas dua tahap, tahap 1 pembuatan lot benih menggunakan pengusangan cepat fisik. Data dianalisis menggunakan Rancangan Acak Lengkap (RAL) satu faktor yaitu lama pengusangan dengan 6 taraf: 0, 24, 48, 72, 96, dan 120 jam. Tahap 2 adalah menentukan lama perendaman benih yang tepat dalam menguji perbedaan kebocoran glukosa, protein, dan pH hasil pengusangan tahap 1 menggunakan USAP. Perlakuan lama perendaman tahap 2 yaitu 3, 6, dan 9 jam. Hasil tahap 1 dan 2 dianalisis menggunakan uji korelasi dan regresi sederhana untuk mengetahui hubungan antara keduanya. Pengembangan uji viabilitas menggunakan USAP berdasarkan indikator glukosa dapat membedakan benih viabilitas tinggi dan rendah dengan lama perendaman efektif varietas Sabrina adalah 3 jam dan varietas Persada 35 adalah 6 dan 9 jam. Perbedaan viabilitas dan vigor tidak terdeteksi berdasarkan indikator protein dan pH., Long bean is a commodity with high demand of seed so it’s necessary to develop rapid and cheap viability testing. Urine sugar analysis paper (USAP) is paper to analyze glucose content, protein and pH in a solution. This research aimed to develop rapid viability and vigor test method of long beans (Vigna sinensis L.) using USAP on several levels of viability and vigor created by accelerated aging. The experiment was conducted on two steps, first is making seed lots using physical accelerated aging. Data analyzed using single factor completely randomized design (CRD) with 6 levels of accelerated aging period i.e. 0, 24, 48, 72, 96, and 120 hours. The second step is determining convenient soaking period of seeds for testing the differences in glucose leakage, protein, and pH from first step using USAP. Soaking period that used i.e. 3, 6, and 9 hours. The results from first and second step were analyzed using correlation and simple regression test to find out the correlation between the two. Development of viability test using USAP based on glucose indicator can distinguish high and low viability seeds with effective soaking period for Sabrina variety was 3 hours and Persada 35 variety was 6 and 9 hours. The differences in viability and vigor can’t be detected based on protein and pH indicators.
Keyword: accelerated aging, glucose, pH, protein, vigor

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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