Judul: Rancang Bangun Alat Pengasapan Dingin Produk Perikanan dengan Sistem Kendali Suhu dan Konsentrasi Asap
Abstrak: Cold-smoking is a method of low temperature (~30-60 °C) smoking with slow duration of drying process. The objective of this research is to develop an instrument of cold-smoking fish products, which resulted through the temperature and smoke concentration control system. The trials were held for 2 days and 5 days by monitoring the temperature and smoke concentration of the fish (the fish used in this research was tuna). The analyses, which used to determine the result of fish products, were organoleptic (taste, smell, appearance, texture, and fungi) and water content. The results showed that the temperatures range from 33.25- 37.44 °C with standard deviations of 2.81–3.67 °C. Therefore, temperature and concentration of smoke can be well controlled. Also, the recording of sensor data is stored into the MMC card. Meanwhile, the average of smoke concentrations obtained were 3.61–4.14 V with standard deviations of 0.35-0.79 V. Water content inside the 2 days cold-smoked fish was 53.77% and 33.47% for the 5 days cold-smoked fish. The new design and construction instrument of cold-smoking fish is better than the previous are by Fansuri. Cold smoke system developed is able to make smoked fish products within 2 days, with the same results as smoke fish products that take place in 5 days.
Keyword: Bogor Agricultural University (IPB), water content, organoleptic, smoke, temperature, cold smoke fish

Judul: Implementasi Sistem Sirkulasi Asap Pada Alat Pengasapan Dingin
Abstrak: Pengasapan dingin (cold smoking) adalah proses pengasapan dengan cara meletakkan ikan yang akan diasap berada jauh dari sumber asap (tempat pembakaran kayu), dengan suhu sekitar 40–50 °C dan lama proses pengasapan beberapa hari sampai dua minggu. Penelitian ini bertujuan untuk mengembangkan alat pengasapan dingin yang telah ada dengan cara memperbaiki sistem sirkulasi asap pada alat pengasapan dingin ikan dan mengoptimalisasi kekurangan yang telah ada yaitu pengontrolan suhu yang merata dan mengoptimalkan energi pembakaran guna menghasilkan asap. Uji coba alat pengasapan dingin ikan dilakukan selama 1 sampai 3 hari dengan memantau suhu dan konsentrasi asap, jenis ikan yang digunakan pada penelitian ini adalah ikan tongkol dan layang. Analisis yang digunakan untuk menentukan hasil ikan dengan pengasapan dingin ini yaitu dengan uji proksimat kadar air dan protein. Hasil penelitian menunjukkan bahwa rata-rata suhu pada ruang pengasapan sebesar 29.6-35.2 °C dan standar deviasi sebesar 4.2–5.7, sedangkan rata-rata konsentrasi asap yang didapat sebesar 136.4–158.9 ppm dan standar deviasi sebesar 26.3-58.8. Suhu dan konsentrasi asap dapat dikontrol dengan baik dan hasil rekaman data sensor disimpan dalam MMC card. Kadar air dalam ikan tongkol asap dengan pengasapan selama 3 hari sebesar 61.37% sedangkan ikan layang asap sebesar 62.78%. Kadar protein dalam ikan tongkol asap dengan pengasapan selama 3 hari sebesar 26.58% sedangkan ikan layang asap sebesar 26.12%. Implementasi sistem sirkulasi asap pada alat pengasapan dingin yang dihasilkan lebih baik dibandingkan dengan penelitian sebelumnya yaitu pada tahun 2015 oleh Nurgraha.
Keyword: Pengasapan dingin ikan, suhu, asap, kadar air, kadar protein

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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