Judul: Kualitas papan partikel dari serutan kayu kamper dengan penambahan bulu domba garut pada beberapa jenis perekat
Abstrak: The hair of Indonesian local sheep, are courses and cannot be utilised to be good, cannot be explaiterd to textile material so that now is still considered a waste. Hair consist of hair fibre which is from hard fobrous protein called keratin. Hairs have some good properted such as good insulations, strong and light, very elastic and are unflanmable (Ensminger, 1962). By considering its good potency, it is consedered to study its posibility to be one of the component of partcleboard, which is a composite product made from lignocellulosesd materials with aglutinant through a forging process (Maloney, 1977).
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Judul: Sifat Fisis-Mekanis Papan Partikel dari Serbuk Bulu Domba, Serbuk Gergaji, dan Serutan Kayu Sengon (Paraserianthes falcataria)
Abstrak: Indonesian or local sheep is classified as a meat type. It is not classified as a wool type because the wool yielded are coarse, so it is not optimally used. Wool can be added in the making of particle board because of its strength, pressure resistance, good insulator, and sound absorption properties. Paraserianthes falcataria (Sengon) saw dust and wood shaving are wood processing waste which can be used as particle board because it contains lignocellulose fiber. This research was to find the best formulation of wool dust (chopped wool at the length of 2-3 mm), saw dust, wood shaving and adhesive concentration used (urea formaldehida). The experiment will be conducted as a factorial experiment with two factors. The factors are wool dust, sawdust, and wood shaving combination (0% :60% : 40% ; 10% : 50% : 40% ; 20% : 40% : 40% ; 30% : 30% : 40%) and adhesive concentration (16, 18, and 20%). The parameter scored are the density, moisture content, thickness swelling, water absorbing capacity, modulus of rupture, modulus of elasticity, internal bond and strength of screw holding power. Any significant differences data will be further analyzed with Polynomial Orthogonal. The result showed that wool dust significantly improved the water absorbing capacity, modulus of rupture, and modulus of elasticity. The urea formaldehida adhesive significantly improved the density and water absorbing capacity. The interaction of two factors significantly improved the thickness swelling, internal bond, and strength of screw holding power. The data from this research showed that the number of density between 0,69-0,78 g/cm3, moisture containt with mean 6,49%, thickness swelling between 32,36-83,9%, water absorbing capacity beetween 89,04-169,15%, modulus of rupture between 68,4- 121,8 kgf/cm2, modulus of elasticity between 671,84-1381,51 kgf/cm2, internal bond between 0,44-1,3 kgf/cm2, and strength of screw holding power between 6,0-22,3 kg. To find out the proportion of the product that suite the JIS A 5908 and SNI 03-2105, the distribution of the data was estabilished and the area under the normal curve (represent the proportion) was examined. From the stand point of density, moisture containt and modulus of rupture more than 95% of the product suited to the standards. However, from the stand point of thickness swelling, modulus of elasticity, internal bond, and strength of screw holding power none of the product suited to the standards.
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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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