Judul: Pengaruh Kombinasi Tebal dan Orientasi Sudut Lamina Terhadap Karakteristik Panel Laminasi Silang Kayu Nangka (Artocarpus heterophyllus Lamk.)
Abstrak: Cross Laminated Timber is a multi-layer wooden panel made of lumber. Each lamina glued or nailed in cross-wise to the adjacent layers for increased rigidity and stability. The objectives of this research are to determine the effect of lamina thickness combination and angle orientation to characteristic of cross laminated timber from nangka wood (Arthocarpus heterophyllus Lamk.) using nail. The average of density, moisture content, volumetric swelling, volumetric shrinkage are 0.58g/cm3, 8,62% , 3.72%, 1.84% respectively. And then for modulus of elasticity, modulus of rupture , and shear strength of nail are 13948 kg/cm2, 260 kg/cm2, 18 kg/cm2, respectively
Keyword: thickness combinationt, nangka wood, cross laminated timber, angle orientation

Judul: Pengaruh Kombinasi Tebal dan Orientasi Sudut Lamina Terhadap Karakteristik Cross Laminated Timber Kayu Jabon Menggunakan Paku
Abstrak: Cross Laminated Timber is a multi-layer wooden panel made of boards. Each layer of boards is placed cross-wise to the adjacent layers for increased rigidity and stability. The objectives of this research are to determine the effect of lamination board thickness combination and angle orientation to characteristic of Cross Laminated Timber from jabon wood using nails. Value of density, moisture content, and swelling volume Cross Laminated Timber from jabon wood affected by interaction of laminated board thickness combination and angle orientation. While shrinkage volume just affected by thickness combination and angle orientation. Value of density Cross Laminated Timber range from 0,33 g/cm³ to 0,51 g/cm³ and value of moisture content range from 12,88% to 18,25%. Combination of 1,67-1,67-1,67 cm thickness combination and 90° angle orientation had lower value for volume swelling and shrinkage volume, respectively 2,82% and 3,31%. Modulus of elasticity, modulus of rupture, lateral resistance, and shear strength of nails Cross Laminated Timber from jabon wood affected by interaction of laminated board thickness combination and angle orientation. Higher value of Modulus of elasticity present in combination of 2-1-2 cm thickness combination and 0° angle orientation, it was 12121 kg/cm². Modulus of rupture of combination A3B1 had highest value, it was 255 kg/cm². Combination of 1,67-1,67-1,67 cm thickness combination and 60° angle orientation had higher value of lateral resistance and shear strength of nail. Results of dimensional stability, MOE, and MOR, panel of 1,67-1,67-1,67 cm thickness combination and 45° angle orientation are best CLT panel.
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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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