Judul: Produksi Tepung Sukun (Artocarpus altilis) Pragelatinisasi
Abstrak: The fruit of breadfruit tree is one alternative carbohydrate source in Indonesia. Breadfruits is an important energy food contain starch and sugar, and usually consume as fresh fruit. However, breadfruit is seasonal crop and sometimes the crops are so plentiful that it can not be eaten fresh. To prevent waste, it was preserved in different way including drying. Flour from breadfruit can be used as important food for all seasons. Breadfruit flour has many limitations since it is difficult to be solubilized and swollen in cold water. The flour is modified physically by pregelatinization to improve its properties. Pragelatinized breadfruit flour can be used as instant food, porridge, and baby food. This research is aimed to investigate the effect of slurry concentration and contact time of the slurry on the drum. The process is conducted using double drum dryer with temperature of plate is 80±5C. Twenty and 30% of slurry were poured into drum with different rotation speed (4, 6 and 8 rpm). Each flour is characterized its chemical composition and physico-chemical properties. Generally pregelatinization did not influence to the chemical composition. Pregelatinization of the flour improved the water solubility and swelling power on room (30C) and hot (70C) solutions, reduced the freeze-thaw stability, caused partial gelatinization which is monitored by losing the birefringence of starch granule, and darkened the flour. The pregelatinized flour also reduced gelatinized temperature and had low final viscosity. Low concentration of slurry and low rotation speed of drum increased the gelatinized part of the flour, which is influenced to the cold and hot water solubility.
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Judul: Karakterisasi Tepung Sukun (Arlocarpus altilis) Pramasak Hasil Pengeringan Drum Serta Aplikasinya Untuk Substitusi Tepung Terigu Dalam Pembuatan Roti Manis
Abstrak: Buah sukun (Artocarpus altilis) merupakan tanaman daerah tropik yang tumbuh subur di daerah yang agak dekat dengan khatulistiwa dar. relatif murah ditanam di daerah basah maupun kering dengan ketinggian 0 -- 700 meter di atas permukaan laul. Sukun merupakan salah satu sumber karbohidrat yang potensial sebagai altematif diversifikasi pangan dan keamanan pangan, karen a selain kandungan gizi yang cukup baik, keberadaannya juga dapat mengatasi kerawanan pangan. Penelitian ini bertujuan untllk mengkarakterisasi tepllng suklln (Arlocarl'lIs altilis) pramasak yang dikeringkan dengan pengering drum dlUl aplikasinya untuk substitusi tepung terigu dalam pembuatan roti manis. Penelitian ini dibagi dalam dua tahap, yaitu penelitian pendahuluan yaitu pembuatan tepung sllkun dan analisis tepung sukun (meliputi anal isis proksimat. flsik, dan fungsional), dan penelitian lanjutlUl yaitu pelllbuatan roti Illanis dan uji organoleptik. Untuk pembuatan tepung sukLm, mula-mula buah sukLm dikupas kulitnya, dibnang bagiall hatinya lalu direndam dalam Na2S20, 0.3 % untuk mencegah pencoklalan. setelah itu daging buah sukun diblansir pacta SUlltl gO"e selama 7 menit dan dilanjulkan dengan pramasak (pengllkusan daging buah sllkun hingga matang) selama 10 menil pada suhu 100°e. Buah sukun pralllasak dihaluskan dengan wet grinder kemudian dikeringkan dengan pengering drum pada suhu 140"e dan kecepatan drum 1.33 rpm. Hasil pengeringan drum dihancurkan dengan Willey Millialu diayak sebingga dihasilkan tepung sukun 60 mesh.
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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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