Judul: Karakteristik Teknik Pemanenan Buah Sawit dan Analisis Energi Potensial Tandan Buah Sawit
Abstrak: Saat dipanen, tandan buah sawit yang jatuh memiliki energi potensial yang eukup besar. Namun sampai saat ini belum ada teknologi untuk menangkap dan memanfaatkan energi potensial tersebut. Tujuan penelitian ini adalah untuk Hempelajari karakteristik teknik pemanenan buah sawit, memilih bahan landasan penangkap buah sawit terbaik dan menganalisis energi potensial buah sawit. Cengamatan dan pengukuran dilakukan pada pemanenan sawit secara manual di Sebuah kebun sawit dengan empat tingkat ketinggian buah yaitu sekitar 3 m, 8 m. m dan 15 m. Ada empat jenis bahan landasan tangkapan buah yang diuji, yaitu: pelat baja, papan kayu, pelat baja expanded dan lembaran karet. Berdasarkan hasil engukuran, pemanen mengambil jarak sekitar 1.63 m dari pohon. Jarak jatuh tandan buah pada range 0.6 m 1.4 m dari pohon. Bahan landasan tangkapan dari Lembaran karet unggul dari bahan lainnya dalam mengurangi buah lepas dan buah memar. Berat dari tandan buah berada di kisaran 16 kg sampai 32 kg. Rata-rata energi potensial pada ketinggian buah 3 m, 8m, 9 m, dan 15 m adalah berturut- Curut 0.6 kJ, 1.7 kJ, 2.0 kJ, dan 3.6 kJ…
Keyword: Catchment platform material, Oil palm fruit, Potential energy, Engineering characteristic

Judul: Karakteristik Teknik Pemanenan Buah Sawit dan Analisis Energi Potensial Tandan Buah Sawit
Abstrak: When harvested, falling palm fruit bunches have a considerable potential energy. But until now there is no technology to capture and utilize the potential energy. The purpose of this research were to study the engineering characteristics of oil palm fruit harvesting, to choose the best fruit bunches catchment platform material, and to analyze the potential energy of the falling fruit bunch when harvested. Observations and measurements were taken on manual palm harvesting in an oil palm plantation with four levels of fruit height of about 3 m, 8 m, 9 m and 15 m. There are four types of catchment platform material were tested, namely: steel plate, wood board, expanded steel plate and rubber sheet. Based on the measurement results, when harvesting, harvesters took a distance of about 1.5 to 3 m to the tree. Bunches fell at a distance between 0.6 m to 1.4 m from the tree. The rubber catchment platform was superior to the other materials in reducing the scattered loose fruits and bruised fruits. The weight of the fruit bunches were in ii the range of 16 kg to 32 kg. The average potential energy at the height of the fruit of 3 m,8 m, 9 m, and 15 m were 0.6 kJ, 1.7 kJ, 2.0 kJ, and 3.6 kJ, respectively.
Keyword: harvesting, engineering characteristic, potential energy, oil palm fruit, catchment platform material

Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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