Judul: Modifikasi Capit Udang Untuk Kastrasi Kelapa Sawit Di PT. Socfindo
Abstrak: Palm (Elaeis) is one of the most important industrial plant which for cooking oil, industrial oil and biodiesel. Recently due to the profit gain by palm oil industring , many forests and farms being converted into palm oil estates. Indonesia is one of the most high-produced palm oil in the world. Palm estate spread in Aceh, Sumatra’s West Coast, Java and Sulawesi region, thus palm oil industry have became the most famous plantation crops in Indonesia. Palm plantation processes consist of nursery, cultivation and harvesting. One of most critical process in cultivation is castration. Castration practically processes male and female flower cutting. Castration is done in order to produce good quality palm fruit. Furthermore, castration keep the uniformity of palm fruit and stay them from pests away. Non-castrated palm tree will produce small and firm fruit which have low economic value. Castration is done by a tool called cap stand. Most of cap stand head is made by steel plate with size of 30 mm. Big size of cap stand which is made by steel plate makes castration difficult to be done, because it’s hard to put the cap stand inside the flower stem and midrib of palm tree. In order to make castration process easier the cap stand was modified. Modification of cap stand consists of changes of material and its size. The cap stand head made by steel bars with diameter of 10 mm, steel bars enable the head to get into the gap of palm tree stems. The cap stand head designed to have the gap of 6 – 9.5 cm, because the flower size is approximately on those range. The stick usually made by wood. In this modification, the cap stand stick made by steel pipe, because of its firmness and durability. Beside that, usage of steel pipe material enable the head and dodos easy to be replaced. In case of dullness of the dodos, workers have no need to brought the whole cap stand to have the dodos grinded down.
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Judul: Design of dodos knife for palm harvesting with oblique blade
Abstrak: Kelapa sawit merupakan tanaman industri penghasil minyak sawit yang dapat diproses menjadi minyak goreng, minyak industri, dan bahan bakar (biodiesel) . Proses pemanenan terdiri dari memotong tandan buah matang, memotong pelepah, mengutip brondolan, dan membawa tandan ke tempat pengumpulan hasil sementara. Proses pemotongan tandanlah yang memerlukan energi paling besar. Tujuan dari penelitian ini adalah merancang dan membuat pisau dodos yang akan digunakan untuk pemanenan kelapa sawit , menganalisis teknik pisau dodos yang akan dibuat , dan membandingkan gaya potong yang dihasilkan oleh dodos mata pisau datar dengan mata pisau miring . Hasil penelitian ini didapatkan rancangan pisau dodos dengan kemiringan mata pisau 35° yang bisa memperkecil gaya untuk memotong tandan kelapa sawit. Gaya rata-rata yang dihasilkan untuk memotong tandan kelapa sawit pada pohon tahun tanam 2007 sebesar 579.77 N untuk mata pisau datar dan 453.22 N untuk kemiringan mata pisau 35° , sedangkan pada pohon tahun tanam 2009 rata-rata gayanya adalah 679.83 N untuk mata pisau datar dan 483.63 N untuk kemiringan mata pisau 35°.
Keyword: palm, harvesting, dodos, cutting

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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