Judul: Studi Unjuk Kerja Mesin Penggilingan Padi di Kandanghaur, Indramayu, Jawa Barat
Abstrak: Rice is one of commodity which has an important role as a staple food for Indonesian people. National rice requirement increases by increasing of Indonesian population, so that it is important for increasing national rice production and quality by improving post-harvest handling. Methodology in this research was measurement of rice milling machine performances. The observed parameter were yield drying, drying capacity, husking capacity, polishing capacity, husking efficiency, milling yield and packaging capacities in the process of drying, milling, and packaging. Result of research showed that drying yield of 89.10%, the drying capacity of 0.8 kgm-2/jam, husking capasity of 9.98 kg/min, polishing capacity of 15.48 kg/min, husking efficiency of 93.12%, milling yield of 56.53%, and packaging capacity of 28 sacks/h or 1400 kg/h.
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Judul: Analisis Kinerja Indo Jarwo Rice Transplanter di Balai Pengembangan Mekanisasi Pertanian, Cianjur, Jawa Barat
Abstrak: Mesin tanam bibit padi merupakan alat penanam dengan jumlah, kedalaman, jarak, dan kondisi penanaman yang seragam. Penelitian ini bertujuan untuk melakukan uji kinerja mesin rice transplanter sehingga dapat ditentukan kapasitas lapang untuk menentukan efisiensi lapang, efektivitas penancapan bibit melalui jari penanam, dan penggunaan biaya pada penanaman padi. Penelitian dilakukan di lahan padi dan mesin rice transplanter milik Balai Pengembangan Mekanisasi Pertanian di Cianjur, Jawa Barat. Hasil penelitian menunjukkan bahwa efisiensi lapang tertinggi yang dihasilkan yaitu sebesar 69,08% dengan menggunakan percepatan 2 akan tetapi tidak menghasilkan perbedaan yang signifikan dengan percepatan 1 yang menghasilkan 68,83%. Hasil tersebut dievaluasi dengan SNI 7607:2010 bahwa hasil efisiensi lapang tidak memenuhi hasil minimum dari standar nasional. Efektivitas penancapan bibit yang tertanam hanya mencapai 55% dengan kondisi lahan lumpur yang tidak sesuai dengan spesifikasi mesin. Konsumsi bahan bakar yang didapat yaitu 1,409 liter/jam dan hasil analisa biaya pokok yang dihasilkan sebesar Rp 437.070,-/ha. Hasil penelitian ini dapat digunakan untuk referensi pengujian kinerja mesin tanam bibit padi., A rice planting machine is a machine with a uniform of number, depth, spacing and planting conditions. This study aims to test the performance of a rice transplanter machine so that field capacity can be determined to determine field efficiency, the effectiveness of seeds planting through the finger of the planter, and the use of costs for planting rice. The research was conducted on rice fields and rice transplanter machines belong to the Agricultural Mechanization Development Center in Cianjur, West Java. The results showed that the highest field efficiency produced was 69,08% using forward speed 2 but did not produce a significant difference with forward speed 1 which produced 68,83%. These results were evaluated with SNI 7607:2010 that field efficiency results did not meet the minimum results of the national standard. The effectiveness of seedling planting only reaches 55% with mud land conditions that do not comply with machine specifications. The obtained fuel consumption is 1,409 liters/hour and the resulting basic cost analysis result is Rp. 437.070,-/ha. The results of this study can be used as a reference for testing the performance of rice seed planting machines.
Keyword: Penanaman padi, Efisiensi lapang, rice transplanter, Uji kinerja

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model