Judul: Pelapisan Lilin dan Void Volume Kemasan untuk Mempertahankan Kesegaran Buah Rambutan (Nephelium lappaceum L.)
Abstrak: Rambutan fruit (Nephelium lappaceum L.) is one of Indonesian local fruits that have been favored by consumers, but, it peels and hairs can be easily withered and blackened in 2-3 days. This problem will significantly decrease the interest of consumer although the flesh of fruit can be safely consumed. The purpose of this research was to determine the best concentration of wax solution and packaging (void volume) to maintain the freshness of rambutan fruit. This research was conducted in 3 different concentrations (0 %, 2 %, and 5%) of wax solution and 2 different void volume combinations (0 % and 25%) of packaging with 10oC of temperature. According to observation and statistical analysis showed that the best results were 2 % wax coating and 25 % void volume of packaging. Based on that treatment, peel and hair appearance of the fruit could be accepted by consumer until twelve day, whereas the control treatment only until eigth day.
Keyword: rambutan fruit., wax coating, packaging, void volume, Bogor Agricultural University (IPB)

Judul: Aplikasi Kemasan Vakum Dan Pelapisan Lidah Buaya (Aloe Vera L.) Untuk Mempertahankan Kesegaran Buah Rambutan (Nephelium Lappeceum L.).
Abstrak: Buah rambutan merupakan salah satu komoditi pertanian yang mudah mengalami penurunan mutu, oleh sebab itu perlu dilakukannya penanganan pasca panen untuk mempertahankan kesegarannya. Tujuan penelitian ini adalah untuk menentukan kombinasi teknik kemasan dan perlakuan konsentrasi lidah buaya (Aloe vera L.) sebagai edible untuk mempertahankan kesegaran buah rambutan. Perlakuan pencelupan buah rambutan dilakukan dengan larutan Aloe vera L. konsentrasi 10% dan 20%, sedangkan perlakuan teknik kemasan dilakukan dengan menggunakan plastik perforasi 10% dari luas permukaan kemasan dan kemasan vakum plastik. Seluruh perlakuan disimpan dalam refrigerator pada suhu 10 °C. Hasil penelitian menunjukkan bahwa perlakuan terbaik adalah pencelupan ke dalam larutan Aloe vera L. konsentrasi 10% dan kemasan perforasi 10% yang dapat menekan jumlah mikroorganisme sebesar 55767 koloni/ml, diterima panelis untuk kesegaran kulit hingga hari ke-9, dan rasa daging buah hingga hari ke-15.
Keyword: coating, kemasan vakum, kesegaran, lidah buaya, rambutan

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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