Judul: Pengaruh penambahan bioaktivator, asam humik dan mikoriza (CMA) terhadap pertumbuhan kaliandra merah (Calliandra calohyrsus)
Abstrak: The aim of study are to determined the effect of application by combined bioactivator and humic acid at different level with or without mycorrhiza on growth and production of Caliiandra calothyrsus. A factorial completely randomized design was applied in this study, which consisted of 2 factors (2x5) and replications, many kind of bioactivator that used in this research are bioenzim and bioc-α. The first factor was mycorrhiza additions (0 and 20 g/polibag) and the second factor was humic acid addition (D0=0 g, D1=5g, D3=7.5 g, D4=10 g). The data were analyzed with analysis of Variance (ANOVA). Duncan Range Test were used if there is any significant effect. The experimental result showed that combination by bioc-α, humic acid and mychorrizae effected significantly vertical length gain, number of branch, stem diameter, total production root dry matter and root infection percentage. Interaction between of bioc-α and 10 gram humic acid with mycorrhiza give the best result to increase growth factor Calliandra calothyrsus.
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Judul: Respon pertumbuhan Calliandra calothyrsus Meissn. dan Calliandra tetragona Benth. terhadap pemberian Fungi Mikoriza Arbuskula dan arang tempurung kelapa
Abstrak: Penelitian ini menggunakan rancangan petak terbagi (split plot design) dengan pola rancangan acak lengkap yang terdiri dari dua faktor. Faktor FMA sebagai petak utama terdiri dari tiga taraf, arang sebagai anak petak terdiri dari tiga taraf dengan lima kali ulangan pada masing-masing perlakuan. Parameter pertumbuhan semai yang diamati selama duabelas minggu setelah tanam yaitu tinggi, diameter, berat kering akar dan pucuk, nisbah pucuk akar, indeks mutu bibit dan kolonisasi akar. Penelitian ini dilaksanakan di Laboratorium Mikrobiologi Hutan dan rumah kaca Pusat Litbang Konservasi dan Rehabilitasi Gunung Batu Bogor. Hasil penelitian menunjukkan interaksi FMA dan arang terbaik pada semai C. calothyrsus dan C. tetragona terdapat pada perlakuan A2M2 (Gigaspora sp. + arang 20%). Semai C. calothyrsus memiliki peningkatan tinggi, diameter dan berat kering pucuk sebesar 397,07%; 107,03% dan 303,82% terhadap kontrol. Semai C. tetragona memiliki peningkatan berat kering akar dan berat kering pucuk sebesar 258,51% dan 340,17% terhadap kontrol dan memiliki IMB sebesar 0,08. Inokulasi Gigaspora sp. memberikan respon lebih baik dibandingkan dengan Glomus sp. pada kedua jenis semai. Semai C. calothyrsus memiliki peningkatan berat kering akar sebesar 156,35% terhadap kontrol dan memiliki IMB sebesar 0,06. Semai C. tetragona memiliki peningkatan tinggi, diameter dan NPA sebesar 93,48%; 44,19% dan 38,20% terhadap kontrol. Pemberian arang terbaik pada kedua semai terdapat pada taraf arang 10%. Semai C. calothyrsus memiliki IMB sebesar 0,06. Semai C. tetragona memiliki peningkatan tinggi dan diameter sebesar 59,67% dan 68,66% terhadap kontrol. Pemberian arang memberikan efek yang positif pada perkembangan FMA tetapi tidak berbeda nyata dengan tanpa pemberian arang. Kata kunci: arang tempurung kelapa, Calliandra callothyrsus, Calliandra tetragona, fungi mikoriza arbuskula (FMA), pertumbuhan
Keyword: Coconut shells charcoal, Calliandra calothyrsus, Calliandra tetragona, Arbuscular mycorrhizae fungi (AMF), Growth

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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