Judul: Pertumbuhan Bakau Kurap (Rhizophora stylosa Griff.) di Persemaian Mangrove Desa Muara, Kecamatan Teluk Naga, Tangerang
Abstrak: Mangrove rehabilitation activities that are being undertaken in Muara village include seedling and planting activities for various species of mangroves, especially Rhizophora stylosa Griff. (bakau kurap). The villagers have problem to see the differences of ripe and mature fruit according to the activities. They often pick the ripe fruits that still have pieces of fruit although ripe fruits need preface treatment that take long time to be a seed. This study was conducted to obtain information about the development of bakau kurap growth in order to obtain a better cultivation technique based on propagules type at nursery, and the growth in the field based on planting treatments. Those are seedling in polybag, seedling non polybag, and direct seed from propagules. The result showed that during 4 months observation, direct seed from propagules treatment gave effect the highest of height growth about 3.19 cm/month. It suggested that rehabilitation activities should used direct seed from propagules at shallow area.
Keyword: Rhizophora stylosa Griff., propagules, Muara village, mangrove rehabilitation

Judul: Pertumbuhan Bakau Merah (Rhizophora mucronata) di Persemaian Mangrove Desa Muara, Kecamatan Teluk Naga, Kabupaten Tangerang
Abstrak: The success of mangrove rehabilitations are influenced by various factors which one of them is the availability of seedling stocks over time. The knowledge about growth process and development of plants which will be used as seedlings are several factors of success of nursery development. Red mangrove (Rhizophora mucronata) is one species of plants which grows in mangrove forest. The conservation of this species is very important because its habitat is at the central zone of mangrove formation and has high reproduction over time so it can be easier to do rehabilitation. The aim of this research is to get the information about R.mucronata growth and development to get better cultivation technique. The treatments were planting of propagul that had pieces of fruit and planting of propagul without pieces of fruit. Based on this research, the planting of propagul without pieces of fruit gave significant effect toward the heigth and length of red mangrove (R.mucronata) propagules development.
Keyword: Rhizophora mucronata, propagul, nursery, growth

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: