Judul: Aplikasi edible coating gel lidah buaya (Aloe vera L.) pada pengawetan buah strawberry (Fragaria sp.)
Abstrak: Starwberry merupakan jenis buah-buahan yang memiliki nilai ekonomi tinggi yang memiliki sifat mudah rusak. Sehingga diperlukan suatu cara mempertahankan kualitasnya dengan memeperpanjang umur simpan dan kesesaraannya. Upaya memperpanjang umur simpan buah dapat dilakukan dengan berbagai cara pengemasan, salah satunya adalah dengan menggunakan edible coating. Edible coating dapat membentuk suatu pelindung pada bahan pangan karena berperan sebagai barier yang menjaga kelembaban, bersifat permeabel terhadap gas-gas tertentu, dan dapat mengontrol migrasi komponen-komponen land air yang dapat menyebabkan perubahan komponen nutrisi, serta dapat dikombinasikan dengan pengawet, antimikroba, maupun plasticizer (Krochta, et.el 1994) Aloe vera yang selama ini dikenal dalam dunia pengobatan dan kosmetik memiliki peluang besar manjadi bahan edible coating, dengan sifat antimikroba yang dimiliki.
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Judul: Aplikasi Edible Coating Lidah Buaya dan Suhu Penyimpanan untuk Menjaga Mutu Salak Pondoh (Salacca edulis Reinw.) Terolah Minimal.
Abstrak: Application of edible coating and storage temperature are common to maintain fruit’s quality. A source that can be used as edible coating is aloe vera which contains antimicrobial substance. Unfortunately extra effort is needed to prepare aloe vera to be edible coating (peeling, crushing, and filtering) that causes difficulties in application. Formulation of aloe vera edible coating in powder form could ease the application. This research aimed to know the effect of spray drying process on aloe vera edible coating characteristics and its effectiveness to maintain minimally processed salak pondoh. Furtheremore, this research aimed to get information about the effect of aloe vera edible coating and storage temperature on minimally processed salak pondoh (Salacca edulis Reinw.). Fruits quality parameters in this research were firmness, weight loss, percentage of damage, and visual changes. Statistical analysis used was Completely Randomized Design with twice replications. The result showed that spray drying process decreased aloe vera edible coating viscosity, total soluble solid (TSS), and titratable acidity, while its pH value increased. Aloe vera edible coating color changed to be yellowish from smooth green. Furtheremore storage temperature gave significant (α=0.01) effect on all parameters, while aloe vera edible coating did not give significant effect on all parameters analyzed, but uncoated fruits were contaminated by molds sooner than coated ones.
Keyword: Edible coating, aloe vera, polysaccharides, minimally processed fruit, spray dry

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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