Judul: Rancang Bangun Inkubator dengan Suhu dan RH Terkendali untuk Penetasan Telur Ulat Sutera
Abstrak: Suhu dan RH yang stabil diperlukan selama proses inkubasi ulat sutera agar hasil penetasan optimal. Inkubator yang telah dirancang mampu menjaga suhu dan RH (di dalamnya) cukup stabil. Suhu dan RH diatur secara otomatis (oleh sistem kontrol) pada nilai set poin yang dapat diubah melalui keypad. Meskipun suhu dan RH lingkungan tidak stabil, sistem mampu menjaga suhu dan RH di dalamnya cukup stabil (pada nilai set poin) selama uji kosong (48 jam). Sebaliknya, selama uji inkubasi (sepuluh hari), suhu di ruang inkubasi stabil namun RH cenderung meningkat. Hal ini dikarenakan silika gel yang digunakan sudah jenuh sehingga tidak mampu lagi menyerap uap air. Pemanas mampu meningkatkan suhu lebih dari 20 °C di atas suhu lingkungan sedangkan pendingin mampu menurunkan suhu sekitar 7 sampai 8 °C di bawah suhu lingkungan. Humidifier mampu meningkatkan RH di ruang inkubasi mencapai 89 % sedangkan dehumidifier mampu menurunkan RH sampai 42 % (tergantung kondisi silika).
Keyword: inkubator, kontrol otomatis, suhu, RH, ulat sutera

Judul: Rancang Bangun Inkubator Menggunakan Lampu Bohlam sebagai Sumber Panas
Abstrak: Temperature and relative humidity is an important aspect in the incubator to incubate chicken eggs. Optimal hatching temperature is in the range 37-38 ˚C while the relative humidity in the range 55-70 %. To get both optimization, testing the distance between the heat source and the surface of the egg is hatched, and examine the effect of the availability of water in the incubator. Tested distance is 5 cm and 10 cm. The heat source used is a 5 watt light bulb as much as 9 pieces. A digital thermostat temperature controller is used to stabilize the temperature in the incubator. At a distance of 10 cm with the test conditions produced a tray filled with water temperature and relative humidity ranges that correspond to the target. By using such treatment, as many as 49 chicken eggs put in the incubator for 21 days. The temperature at the time of hatching obtained an average of 37.5 ˚C with a relative humidity of an average of 61.4 %. Screening is done manually eggs 3 times a day starting from day 4 to day 18 of hatching period. Of the 49 eggs that hatched, as many as 6 eggs did not hatch so generated hatchability of 87.8 %.
Keyword: temperature, relative humidity, incubator, hatching eggs, hatchability

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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