Judul: Studi Beban Kerja Fisik pada Pengendalian HPT Kopi dengan Sprayer.
Abstrak: Kegiatan pengendalian hama dan penyakit tanaman (HPT) di Indonesia umumnya dilakukan secara kimiawi. Metode kimiawi umumnya menggunakan bantuan alat sprayer. Namun penggunaan sprayer dapat menimbulkan beban kerja dan efektivitas yang berbeda bagi operator. Penelitian ini melakukan uji ergonomi yang difokuskan pada beban kerja penggunaan alat knapsack sprayer dan knapsack power sprayer. Analisis dilakukan berdasarkan parameter fisiologis (denyut jantung). Pengamatan dilakukan terhadap 4 orang laki-laki pada aktivitas penyemprotan. Heart Rate Monitor (HRM) digunakan untuk mencatat detak jantung saat subjek melakukan aktivitas. Hasil penyemprotan menggunakan alat knapsack power sprayer terbukti secara komparatif lebih baik dan produktif dibandingkan dengan menggunakan knapsack sprayer. Tingkat kelelahan (IRHR) penyemprotan menggunakan knapsack sprayer dan knapsack power sprayer secara berturut-turut adalah sangat berat sampai sedang dan berat sampai sedang. Laju konsumsi energi penyemprotan menggunakan knapsack sprayer dan knapsack power sprayer secara berturut-turut adalah 0.033 kkal/kgmenit dan 0.027 kkal/kgmenit. Kapasitas kerja penyemprotan menggunakan knapsack sprayer dan knapsack power sprayer secara berturut-turut adalah 35.77 are/hari dan 42.78 are/hari. Biaya operasional penyemprotan HPT kopi menggunakan knapsack sprayer dan knapsack power sprayer secara berturut-turut adalah Rp 692.001,79/ha dan Rp 681.664,90/ha.
Keyword: beban kerja, knapsack power sprayer, knapsack sprayer, penyemprotan, tingkat kelelahan

Judul: Analisis Beban Kerja Kegiatan Penyemprotan Lahan dan Gudang Pertanian menggunakan Mesin Thermal Fogger Tipe TS-35A(E)
Abstrak: Abundance farms in Indonesia led to greater levels of pest attack. One of the method to control pest growth was pest fumigation. However, the use of thermal fogger machine must also consider the fatigue and workload received by the operator. This study will focus on physiological aspect of operator, ie the level of workload and total energy consumption while operating Thermal Fogger machine type TS-35A (E). Measurement of workload carried out with three repetitions. At the beginning of the measurement, and in each and every repetition punctuated by rest for approximately 10 minutes. The result for Qualitative Workload Levels (fatigue) for fumigation using Thermal Fogger type TS-35A(E) on field was categorized Very Heavy category with average IRHR 1769 ± 0140 meanwhile for warehouse was categorized in Heavy category with average IRHR 1.638 ± 0.128. This means that fogging activities on field heavier than activities on warehouse. The average energy consumption of the operator (Total Energy Cost) for fumigation using Thermal Fogger TS type 35A (E) on the field was 2247 ± 0373 kcal / min, while fumigation in warehouse was 2174 ± 0278 kcal / min. This means that the work done in the field use more energy per unit of time.
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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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