Judul: Correlation Analysis of Environmental Factors on Kudzu (Pueraria javanica) Growth and Productivity
Abstrak: Kondisi lingkungan merupakan masalah utama dalam menghasilkan hijauan yang berkualitas, di antaranya intensitas cahaya, curah hujan, suhu, dan kelembapan. Penelitian ini bertujuan untuk menganalisis hubungan antara pertumbuhan dan produktivitas tanaman kudzu (Pueraria javanica) dengan faktor lingkungan. Penelitian ini menggunakan metode penelitian lapang dengan data iklim dari BMKG Bogor. Hasil penelitian menunjukkan tinggi tanaman, jumlah daun, dan jumlah cabang berkorelasi positif kuat dengan curah hujan. Intensitas cahaya, kelembapan, dan suhu memiliki nilai korelasi yang rendah dengan variabel pertumbuhan tanaman. Produktivitas kudzu terbesar pada lima bulan dengan berat segar sebesar 10,56 ton ha-1 tahun-1 dan berat kering sebesar 2,5 ton ha-1 tahun-1., Environmental conditions are the main problem in producing quality forage, including light intensity, rainfall, temperature, and humidity. This study aims to analyze the relationship between the growth and productivity of kudzu (Pueraria javanica) plants with environmental factors. This study used a direct field research method with climate data from BMKG Bogor. The result showed that plant height, number of leaves, and number of branches had a strong positive correlation with rainfall. Light intensity, humidity, dan temperature had a low correlation value with plant growth variables. Kudzu has the highest productivity at five months with a fresh weight of 10,56 tons ha-1 years-1 and a dry weight of 2,5 tons ha-1 years-1.
Keyword: climate, correlation analyze, growth, kudzu, productivity

Judul: Pueraria javanica Regrowth, Production and Conservation with Various Additive Types in Pasture
Abstrak: Penelitian ini bertujuan mengevaluasi pertumbuhan kembali dan konservasi kudzu dengan dibuat pakan silase. Penelitian dilaksanakan di Unit Pendidikan dan Penelitian Peternakan Jonggol (UP3J), Laboratorium Agrostologi, Laboratorium Nutrisi Ternak Perah (NTP) dan Laboratorium Pusat Antar Universitas (PAU). Penelitian pada silase dilakukan dengan menggunakan metode rancangan acak lengkap (RAL) dengan 4 perlakuan dan 5 ulangan pada pembuatan silase, yaitu P0 = tanpa penambahan aditif, P1 = 5% dedak padi, P2 = 5% pollard, P3 = 5% bungkil inti sawit. Peubah yang diamati adalah pertumbuhan kembali, produksi hijauan, dan uji silase meliputi uji organoleptik, uji pH, analisis proksimat, KcBK dan KcBO. Data penelitian pH silase dianalisis menggunakan ANOVA, hasil yang berbeda nyata diuji lanjut Tukey. Laju pertumbuhan kembali dibuat grafik dengan analisis regresi. Hasil penelitian menunjukkan pertumbuhan kembali meningkat setiap minggunya yang berpotensi untuk dikembangkan lebih lanjut dengan melihat beberapa paramater yaitu tinggi, jumlah daun dan jumlah cabang. Konservasi kudzu dalam bentuk silase dengan pemberian bahan aditif dapat meningkatkan kualitasnya dibandingkan dengan kontrol. Silase dengan penambahan aditif bungkil inti sawit menunjukkan hasil yang paling efektif kualitas nutriennya., This study aims to evaluate kudzu regrowth and conservation through ensilage method. The research was carried out at Jonggol Animal Husbandry Education and Research Unit (UP3J), of Laboratory Agrostology, of Dairy Animal Nutrition Laboratory (NTP) and Inter-University Central Laboratory (PAU). The study on silage was conducted using a completely randomized design (RAL) method with 4 treatments and 5 replications in silage making, namely P0 = without the addition of additives, P1 = 5% rice bran, P2 = 5% pollard, P3 = 5% palm kernel. The variables observed were regrowth, forage production, and silage test such as organoleptic, pH test, proximate analysis, KcBK and KcBO. The data were analyzed using ANOVA, the significant result were followed by Tukey test. Regrowth rate graphed with regression analysis. The results showed that regrowth increased every week based on plant height, number of leaves and branches. Kudzu conservation through ensilage with different additives were improved its quality. Palm kernel addition on silage showed the most effective results nutrition quality.
Keyword: additives, conservation, kudzu, regrowth, silage

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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