Judul: Aplikasi Edible Coating Berbasis Pati Singkong Untuk Memperpanjang Umur Simpan Buah Naga Terolah Minimal
Abstrak: Buah naga memiliki khasiat yang tinggi dan sering dijual sebagai buah terolah minimal oleh pedagang eceran sehingga banyak upaya yang dilakukan untuk mempertahankan mutunya. Tujuan penelitian ini adalah untuk mengetahui pengaruh aplikasi edible coating berbasis pati singkong terhadap mutu dan umur simpan buah naga (Hylocereus costaricensis) terolah minimal selama penyimpanan atmosfer termodifikasi. Pengamatan dilakukan terhadap laju respirasi dan perubahan mutu buah naga seperti susut bobot, perubahan warna, perubahan kekerasan dan total padatan terlarut. Hasil akhir penelitian ini berupa usulan kombinasi konsentrasi pati singkong dalam larutan edible coating, suhu penyimpanan dan komposisi atmosfer termodifikasi yang paling baik untuk penyimpanan buah naga terolah minimal. Konsentrasi pati singkong terbaik yang diperoleh adalah 4%, suhu 5°C dan komposisi atmosfer penyimpanan 2-4% O2 dan 7-9% CO2.
Keyword: dragon fruit, edible coating, Hylocereus costaricensis, minimally processed, modified atmosphere

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: 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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