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: Pengaruh vaksinasi terhadap dinamika populasi pada model SIR (Susceptible-Infected-Recovered)
Abstrak: SIR model can be used to model the spread of diseases in a closed population based on certain assumptions. In this research, the SIR model is formulated by including the factor of vaccination. As the result, the model has been shown to have two equilibrium points, i.e. disease free and endemic equilibrium. A simulation study is carried out to illustrate the model. The results show that some equilibrium points are asymptotically stable. Moreover, a minimum level of vaccination has been defined. For the vaccination level less than the minimum level, increase in the vaccination level results in decrease of the proportion of infected individuals in the corresponding equilibrium point. On the other hand, for the vaccination level greater than the minimum level, increase in the vaccination level results in decrease the proportion of susceptible individuals in the corresponding equilibrium point. Furthermore, when vaccination level is greater than the minimum level, it is found that the time needed for the disease to extinct is shorter.
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