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: Uji Klon Jati Unggul Nusantara (JUN) Umur 30 Bulan Di Kabupaten Purwakarta, Jawa Barat
Abstrak: Jati Unggul Nusantara (JUN) is known as commercial planting stock material that is vegetatively propagated by means of shoot cutting technique. JUN is claimed to be fast growing. However, scientific information on the growth of selected JUN clones from clonal tests is still lacking. The objective of the study were i) to review performance of 41 JUN clones, ii) to estimate their genetic parameters and iii) to assess the effect of microsites on tested JUN clones. Genetic assessment of JUN clones was carried out in Purwakarta, West Java in a Randomized Complete Block Design (RCBD) consisting of 41 clones. The clones were planted on 4 microsites that were differentiated by fertilizer doses and spacings. The results showed that generally survival rates were high (>90%). In addition, repeatability at 30 months after planting was about = 0.948 (diameter) and = 0.699 (height), respectively. While genetic and phenotypic correlations between diameter and height were rG=0.315 and rP=0.864, respectively. The best microsite supporting growth of JUN clones at 30 months was found on microsite 1, namely spacing 3 m x 4 m with 3 kg organic fertilizer, while the best straight stem form (around 45% of the population) was observed on microsite 2.
Keyword: stemform, repeatability, genetic correlation, fenotipe correlation, Jati Unggul Nusantara (JUN)

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.
Keyword: