Judul: Evaluasi pertumbuhan tegakan Jati Unggul Nusantara (JUN) berdasarkan kondisi wilayah penanaman di Pulau Jawa
Abstrak: Jati Unggul Nusantara (JUN) is a genetically modified teak which has a faster harvest rotation than another variance of teak that in 5 years, stands can gets an average diameter of 20 cm. The purposes of this research are to evaluate the growth of JUN based on growing environmental conditions and to estimate JUN dimensions outlook based on rotation age. This research was conducted at three sites representing JUN stands on Java, which is Bogor regency representing West Java, Kulon Progo regency, Yogyakarta represent Central Java, and Ngawi regency represent East Java. The results showed that JUN stands in Ngawi, East Java has the fastest growth than all research sites however the average diameter of 5 years JUN stands on all sites are no one which up to 20 cm. The main issues of the final results that did not appropriate the target are poor seeds quality from seedbed and poorly field managements.
Keyword: Bogor Agricultural University (IPB), stands growth, Jati Unggul Nusantara (JUN), growth model

Judul: The Growth Monitoring of Clone Jati Unggul Nusantara (JUN) Aged 45 Months in Purwakarta.
Abstrak: Pemantauan hutan umumnya dilakukan oleh tenaga terlatih dan belum banyak melibatkan masyarakat lokal dalam hal pengumpulan data atau pengukuran. Akan tetapi keakuratan hasil pengukuran yang dilakukan oleh masyarakat lokal masih perlu diuji dengan cara membandingkan hasil pengukurannya dengan tenaga terlatih. Tujuan dari penelitan ini adalah untuk menilai kemampuan masyarakat lokal (petani penggarap) dalam memonitor pertumbuhan Jati Unggul Nusantara (JUN) berumur 45 bulan. Penelitian pemantauan pertumbuhan JUN dilakukan di lokasi uji klon di desa Sukatani, Purwakarta (Jawa Barat). Pengambilan data difokuskan pada variabel diameter yang dilakukan secara sensus dengan 11 petani penggarap dan tenaga terlatih sebagai kontrol, kemudian dilakukan sampling untuk melihat konsistensi pengukurannya. Secara umum hasil penelitian pada 4 microsite menunjukkan bahwa pengukuran diameter antara tenaga terlatih dan petani penggarap tidak berbeda nyata (p-value > 0.05). Hasil Uji T pengukuran diameter yang dilakukan oleh tenaga terlatih dengan 11 petani penggarap, menunjukkan 4 petani penggarap yang pengukurannya berbeda nyata. Petani penggarap yang memiliki nilai rata-rata pengukuran terbaik yaitu petani penggarap 1 dan 3. Hasil korelasi menunjukkan adanya hubungan yang nyata dan bernilai positif antara pengukuran yang dilakukan oleh tenaga terlatih dengan petani penggarap. Biaya yang dikeluarkan untuk petani penggarap jauh lebih kecil daripada tenaga terlatih, yaitu masing-masing Rp 609 600 dan Rp 4 128 000.
Keyword: Jati Unggul Nusantar (JUN), Local community, Monitoring, Forestry, Forest monitoring, Tectona grandis, Microsite

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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