Judul: Mempelajari pengaruh berbagai perlakuan kemasan untuk mempertahankan kesegaran dan kualitas buah salak cv.suwaru selama penyimpanan
Abstrak: Salak (Sallaca edulis, Reinw) adalah tanaman asli Indo- nesia. Berdasarkan survei majalah Trubus (1986), dari 20 jenis salak yang ada di Indonesia terdapat satu jenis yang diklasifikasikan sebagai buah unggul nasional tahun 1991, yaitu salak Suwaru. Buah salak ini umumnya dikonsumsi dalam bentuk segar, sehingga perlu penanganan lebih lanjut untuk mempertahankan kesegaran dan mutunya selama distribusinya. Penelitian ini terdiri atas penelitian pendahuluan dan penelitian utama. Penelitian pendahuluan terbagi dalam 2 tahap, yaitu tahap penentuan titik "kesetimbangan gas" (5,7 % CO2 dan 3,930) dan tahap penentuan konsentrasi CO2/02 (2,5 CO2 dan 10 % 02) yang diamati setiap 6 jam untuk keperluan perlakuan penyimpanan dengan sistem atmosfir termodifikasi (penambahan gas awal) pada penelitian utama. Bahan yang digunakan dalam penelitian ini adalah buah salak Suwaru (kematangan 3- 4 bulan), plastik PE ketebalan 40 µm, kertas "chusioning material", lilin konsentrasi 6%, kotak karton gelombang (25 cm x 25 cm x 15,5 cm) dan kotak anyaman bambu (25 cm x 25 cm x 13 cm). Rancangan percobaan yang digunakan adalah rancangan acak lengkap dengan peubah...
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Judul: Pengaruh Jenis Kemasan Dan Suhu Penyimpanan Terhadap Kesegaran Dan Kualitas Buah Salak Padangsidimpuan (Salacca sumatrana)
Abstrak: This study aims to obtain the storage temperature and type of packaging which suitable for salak Padangsidimpuan. The research was conducted in two stages, i.e. preliminary research and primary research. Preliminary research carried out by measuring the initial quality (total weight lose, perishable fruit, water content, total titrated acid, total soluble solids, vitamin C and organoleptic). The results and than are used as initial data to conduct primary research. Primary research was conducted by coated 1 kg of salak and then packed with cartons, bamboo basket, plastic PE with cartons and plastic PE with bamboo basket. All samples were storaged in at 15oC and room temperature. Salak without treatment was also stored at room temperature as a control. Samples were analyzed the qualities every three days. Based on this research, physico-chemical characteristic of salak Padangsidimpuan showed that the water content was 78.12%, total titrated acid was 6.34%, total soluble solids was 15oBrix, vitamin C was 1.87 mg/100 g fruit, the preference score for color was 4, aroma was 4, flavor was 3, texture was 3 and general acceptance was 3. Based on the ANOVA analysis, Duncan test and “t” test, can be concluded that salak Padangsidimpuan were stored at a temperature of 15oC hold maximum of 30 days, with cartons, bamboo basket, plastic PE with cartons and plastic PE with bamboo basket. However the best condition of packaging resulted from this research was bamboo basket in 15oC.
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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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