Judul: Studi Keberhasilan Grafting Jati (Tectona grandis L.f)
Abstrak: Jati merupakan salah satu jenis kayu komersial yang banyak diminati. Jati yang unggul dapat dipertahankan dengan teknik vegetatif grafting. Salah satu kendala pada grafting yaitu inkompatibilitas batang atas (scion) dan batang bawah (rootstock). Oleh karena itu, diperlukan penentuan umur pohon induk, umur dan kondisi scion sebagai bahan grafting. Penelitian ini bertujuan menguji sumber scion terhadap keberhasilan grafting jati. Percobaan pertama menggunakan scion yang cenderung tua dan tidak diketahui umurnya. Percobaan kedua menggunakan scion berumur 8 hari. Percobaan ketiga menggunakan scion dari bibit Jati Plus Perhutani berumur 8 bulan. Penelitian dilakukan di Taman segitiga Departemen Silvikultur (DSVK) dan Rumah Kaca DSVK IPB pada bulan April hingga Juni 2022. Prosedur penelitian diawali dengan pemilihan rootstock, pemilihan scion, penyambungan, pemeliharaan, hingga analisis data. Penyambungan dilakukan dengan metode sambung sisip dan top cleft grafting pada percobaan pertama dan kedua. Percobaan ketiga hanya menggunakan metode top cleft grafting. Rancangan yang digunakan adalah RAL (rancangan acak lengkap) satu faktor dengan perlakuan A (teras rumah kaca) dan B (dalam rumah kaca). Data dianalisis dengan software SAS 9.0. Hasil penelitian menunjukkan percobaan pertama dan kedua mengalami kegagalan total. Adapun percobaan ketiga total persentase keberhasilan sebesar 20,84%., Superior teak can be maintained with vegetative grafting techniques. One of the obstacles to grafting is the incompatibility of scions and rootstocks. Therefore, it is necessary to determine the age of the seed trees, the age and condition of the scion as a grafting material. This study aims to test the source of scion against the success of teak grafting. The first experiment used a scion which tends to be old and its age is unknown. The second experiment used an 8-day-old scion. The third experiment used scion from 8-month-old Perhutani Jati Plus seedlings. The study was conducted in the Triangular Park of the Silviculture Department (DSVK) and the DSVK IPB Greenhouse in April to June 2022. The procedure begins with rootstock selection, scion selection, splicing, maintenance, and data analysis. Splicing is carried out by the method of connecting the insert and top cleft grafting in the first and second experiments. The third experiment used only the top cleft grafting method. The design used was a one-factor RAL (complete random design) with treatment A (greenhouse terrace) and B (in greenhouse). The data was analyzed with SAS 9.0 software. The results showed that the first and second experiments failed miserably aand third experiment, the total success percentage was 20.84%.
Keyword: grafting, jati, rootstock, scion

Judul: Approach Grafting Technique on Kandel  Cultivars of Jackfruit (Artocarpus heterophyllus Lam.)
Abstrak: Teknik sambung susu merupakan teknik grafting dengan kondisi batang atas dan batang bawah dibiarkan tetap berada pada perakaran masing-masing, sehingga suplai hara menjadi lebih banyak. Nangka (Artocarpus heterophyllus Lam.) merupakan tanaman multiguna karena hampir seluruh bagian tanaman dapat dimanfaatkan, seperti buah muda, buah masak, bahkan kulit buah yang sudah menjadi limbah. Nangka kultivar Kandel memiliki keunggulan daging buah lebih tebal, tingkat kemanisan buah lebih tinggi, serta tekstur daging buah yang lebih krispi. Penelitian bertujuan mendapatkan informasi mengenai kompatibilitas batang atas (scion) dan batang bawah (rootstock) pada bibit nangka untuk pertumbuhan optimal hasil grafting. Penelitian menggunakan Rancangan Acak Lengkap (RAL) satu faktor dengan 3 taraf perlakuan berupa perbedaan umur batang bawah yaitu 3, 6, dan 9 BST, dengan masing-masing perlakuan terdapat 6 ulangan. Perbedaan umur batang bawah berpengaruh terhadap persentase kesegaran tanaman dan diameter batang bawah. Namun tidak terdapat perbedaan yang signifikan pada karakter agronomi batang atas dan diameter batang atas., Approach grafting is a grafting technique where the scion and rootstock are allowed to remain on their respective roots, so that the nutrient supply becomes greater. Jackfruit (Artocarpus heterophyllus Lam.) is a multipurpose plant because almost all parts of the plant can be used, such as young fruit, ripe fruit, and even fruit skin that has become waste. The Kandel jackfruit cultivar has the advantage of thicker flesh, a higher level of fruit sweetness, and a crisper flesh texture. The research aims to obtain information regarding the compatibility of scion and rootstock in jackfruit seedlings for optimal growth as a result of grafting. The research used a one-factor Completely Randomized Design (CRD) with 3 treatment levels in the form of differences in rootstock age, namely 3, 6 and 9 MAP, with 6 replications for each treatment. Differences in the age of the rootstock affect the percentage of plant freshness and the diameter of the rootstock. However, there were no significant differences in the agronomic characteristics of the scion and scion diameter.
Keyword: kompatibilitas, batang atas, batang bawah, umur bibit

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: