Judul: Pengaruh Pelapisan Lilin dan Suhu Penyimpanan terhadap Masa Simpan Buah Naga Super Red (Hylocereus costaricensis)
Abstrak: Hylocereus costaricensis or super red dragon fruit has a short shelf life due to its withered scales that affects consumers‟ preference. Coating application and low temperature storage were expected to extend the shelf life. The aim of this research is to study the application of coating and the impact of its interaction with storage temperature on super red dragon fruit shelf life. Coating using cera alba wax with and without stearin as the substitution were applied in dragon fruits that then were stored at room temperature, 12oC, and 5oC. The analysis of scale freshness percentage, weight loss, firmness, and ion leakage were done every 2 days for room temperature and 7 days for low temperature. The result showed that dragon fruits could be stored for 4 days at room temperature, 14 days at 12oC, or 21-28 days at 5oC. Coating treatment gave no effect unless combined with low temperature. Storage of 5oC without coating treatment was able to maintain fruit quality, particularly on its weight loss. The stearin could be used as cera alba substitution that it gave no negative effect.
Keyword: storage temperature, shelf life, dragon fruit, coating

Judul: Pengaruh pengemasan dan suhu terhadap daya simpan buah naga super merah (Hylocereus costaricensis)
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh pengemasan dan suhu penyimpanan terhadap daya simpan buah naga super merah yang dilaksanakan di kebun buah naga Indian Hills Sentul, Bogor dan Postharvest Laboratory, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor, dari Januari hingga Februari 2010. Penelitian dilakukan dalam percobaan faktorial dengan rancangan acak lengkap (RAL). Faktor pertama, yaitu pengemasan terdiri dari perlakuan tanpa pengemasan (P0), buah dibungkus koran dan disimpan dalam kardus (P1), buah dibungkus plastik yang dilipat dan disimpan dalam kardus (P2). Faktor kedua yaitu perlakuan suhu, terdiri dari suhu kamar (T1) dan suhu 150C (T2). Buah yang digunakan adalah buah naga super merah yang dipanen pada 33 hari setelah anthesis kemudian dilakukan kegiatan pascapanen, yaitu pengumpulan sementara, pencucian, sortasi, grading, dan pemberian perlakuan pengemasan dan suhu penyimpanan. Data yang diperoleh diolah menggunakan uji F dan uji jarak berganda Duncan taraf kesalahan (α) 5%. Selama penyimpanan dilakukan pengujian mutu buah meliputi kesegaran, pengerutan kulit, gangguan penyakit, kekerasan buah, padatan terlarut total, dan asam tertitrasi total. Buah yang layak untuk dikonsumsi yaitu buah dengan nilai skor ≤ 3.0 untuk kesegaran, pengerutan kulit dan gangguan penyakit. Perlakuan suhu 150C dapat memperpanjang daya simpan buah naga super merah hingga 15 hari. Perlakuan pengemasan yang dikombinasikan dengan suhu kamar maupun suhu dingin, tidak berpengaruh nyata terhadap mutu buah naga super merah.
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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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