Judul: Karakteristik Fisik, Mekanik dan Termal Papan Partikel Sabut Kelapa (Cocos nucifera L.) Berlapis Bambu Betung (Dendrocalamus asper sp.) Sebagai Material Bangunan
Abstrak: Demand of woods as raw materials in the industry are more than the availability, therefore research is needed to develop the other alternatives to substitute the woods as the primarily raw material. In this case, the aim of this research are to construct particle boards made of coco fiber and betung bamboo and to research their physical, mechanical and thermal characteristics. Physical characteristics of particle board have qualified the particle board standards, that are: density 0.79 cm3/g, moisture content 13.88 %, and water absorption 40.1%, except the thickness swelling percentage reached 15.18%. The mechanical characteristics of particle board have qualified the JIS A 5908-2003 and SNI 03-2105-2006 standards, that are: tensile strength 137.57 kgf /cm2, compressive strength 87.44 kgf/cm2, Modulus of Elasticity (MOE) 24970.46 kg/cm2, screw-withdrawal strength 105.81 kgf, and internal bond 2.54 kgf/cm2, except the Modulus of Rupture (MOR) value that only reached 21.10 kg/cm2. This study also reveals that using particle boards made of coco fiber and bamboo betung as storage walls are less capable to prevent the oven heats which is proven by the increasing of temperature of taro inside the storage box along the increasing of temperature of the oven.
Keyword: betung bamboo, coco fiber, mechanical characteristics, particle boards, physical characteristics

Judul: Karakteristik dan Aplikasi Papan Partikel “coco fiber” sebagai Kotak Penyimpanan Talas (Colocasia esculenta L.).
Abstrak: Coconuts production in Indonesia reach 3.21 million ton per year. The largest waste product of coconuts are coco fibers, which 35% weight of coconut. Nowadays, coco fibers are only used to produce doormat, broom etc. Therefore a research to increase the additional value of coco fiber is required. This research was aimed to utilize coco fiber as the raw material of particle board, and studied the physical, mechanical, and thermal properties of the particle board. The products were reached out the standard of SNI 03-2105-2006, except the thickness swelling and modulus of elasticity. Specific heat test of particle board is 843.42 J/kg K and thermal conductivity of particle board is 0.1960 W/m °C.
Keyword: physical-mechanical-thermal properties, particle board, coco fiber

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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