Judul: The Health Assessment of Shorea spp. Seed Source by Forest Health Monitoring method in order to formulate Management Strategy of FASP Haurbentes, Bogor.
Abstrak: Kawasan hutan dengan tujuan khusus (KHDTK) Haurbentes adalah salah satu kawasan hutan yang telah ditunjuk untuk kegiatan penelitian dan pengembangan. KHDTK Haurbentes yang dibangun sejak tahun 1940 ini terletak di Kecamatan Jasinga Kabupaten Bogor. Peran dan fungsi KHDTK Haurbentes saat ini telah berkembang antara lain sebagai sumber benih dan plasma nutfah Shorea spp. Fungsi KHDTK Haurbentes tersebut menjadi sangat penting mengingat populasi dan penyebaran Shorea spp. di alam yang semakin berkurang, akibat eksploitasi secara berlebihan tanpa diiringi upaya pelestarian., Forest area with special purposes (FASP) of Haurbentes was one of the forest areas for research and development activities. FASP of Haurbentes was established in 1940 located at Jasinga Sub-District of Bogor. Currently the roles and functions of FASP of Haurbentes are to become seed sources and germplasm conservation area for Shorea species. The functions of FASP Haurbentes become more important considering the population and distribution of Shorea spp. in nature, which have threatened by over exploitation without any effort of conservation.
Keyword: Forest health monitoring, FASP, seed sources, Shorea spp., sustainability

Judul: Komposisi Jenis dan Struktur Tegakan Shorea stenoptera Burck di Areal KHDTK Haurbentes, Kabupaten Bogor, Jawa Barat
Abstrak: Luasan hutan di Indonesia yang semakin berkurang akibat deforestasi memerlukan pengelolaan hutan lestari. Shorea stenoptera Burck merupakan salah satu jenis endemik tanaman kehutanan di Borneo. IUCN menyatakan bahwa jenis tersebut termasuk ke dalam status hampir terancam (Near Threatened). Tujuan penelitian ini adalah menganalisis komposisi jenis, struktur tegakan, dan regenerasi alami tegakan S. stenoptera, serta mengidentifikasi pengaruh aspek biofisik terhadap keragaan regenerasi alami S. stenoptera di KHDTK Haurbentes, Kabupaten Bogor, Jawa Barat. Metode yang digunakan adalah analisis vegetasi dengan membangun petak pengamatan sebanyak 5 petak. Hasil penelitian menunjukkan bahwa jenis S. stenoptera mendominasi pada setiap tingkat pertumbuhan pada petak pengamatan S. stenoptera. Struktur tegakan menunjukkan kurva J terbalik. Hal tersebut mengindikasikan tegakan S. stenoptera mengalami perubahan formasi ke hutan alam. Regenerasi S. stenoptera menunjukkan regenerasi normal dengan kerapatan individu semakin berkurang seiring bertambahnya kelas diameter. Aspek biofisik seperti kelerengan dan elevasi sangat memengaruhi pertumbuhan S. stenoptera., The decrease of forest areas in Indonesia because of deforestation need sustainable forest management. Shorea stenoptera Burck is native forest species in Borneo. IUCN declare this species included in Near Threatened. This research aims to analyze species composition, stand structure and natural regeneration of Shorea stenoptera Burck, also identify the biophysics effect on the regeneration performance of S. stenoptera in KHDTK Haurbentes. This research methods is using vegetation analysis by constructing five observation areas. The results thats S. stenoptera dominating in every growth level in S. stenoptera observation area. Stand structure showing inverse J curve. Thats indicates S. stenoptera stand have changed to nature forest. S. stenoptera regeneration showing normal regeneration with density decreased along diameter class increased. Biophysics aspect like slope and elevation effects the S. stenoptera growth.
Keyword: biophysics, natural forest, regeneration

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
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