Judul: Kajian Struktur Anatomi dan Sifat Fisis Kayu Terap (Artocarpus odoratissimus), A Lesser Known Species Asal Kalimantan Selatan
Abstrak: Wood properties are correlated to proper utilization as well as processing. The objective of this research was to assess anatomical characteristics and physical properties of terap wood from South Kalimantan to promote its better utilization. Wood disk of 5 cm thick from a single tree at 1.3 m from the ground was utilized as sample unit. Radial variation of fiber length, microfibril angle (MFA), wood density, specific gravity (SG) and moisture content was measured from pith towards the bark represented by heartwood portion, sap- and heartwood region as well as sap wood region. Fiber dimension was measured through maceration specimens, while the MFA by microtome specimens. Wood density, SG and moisture content were measured by using gravimetric method. It was showed that wood properties were not affected by sample location within the wood disk. Wood density and SG tended to increase from pith towards the bark, while MFA tended to decrease. Average values of moisture content, wood density, SG, fiber length and MFA are 14.34%, 0.35g/cm3, 0.31, 1198.30±201.54 μm, 20.16±2.74o, respectively. With the 2-nd rank for fiber quality and 4-th rank for the strength, it determined wood could be used as raw materials for pulp and paper production and for lightweight construction.
Keyword: terap wood, microfibril angle, physical properties, anatomical structure

Judul: Struktur Anatomi dan Sifat Fisis Kayu Reaksi pada Kayu Terap (Artocarpus odoratissiumus) Asal Kalimantan Selatan
Abstrak: Wood is a product of tree metabolism. It varies among species, between trees of similar species and also within a single stem. Besides genetic factor, another factor that affecting these variabilities is growing condition and maturation level of the cells. Wood variation within a single stem of the tree will be increased dues to the existence of natural defect such as reaction wood, which can affect the entire characteristics and quality of the wood. Since study of reaction wood in tropical plantation wood species is very limited, this research aims to determine anatomical structure, fiber morphology and some physical properties of tension wood of terap (A. odoratissimus). The results are then compared to those of the opposite wood. The result shows that only MFA and wood density are varied between tension- and opposite woods. MFA of the tension wood are 14.83% greater than that of opposite wood, while wood density is 10.42% greater than that of the opposite wood. Compared to those of normal wood, fiber length of tension wood is shorther, but their MFA, specific gravity and wood density are bigger.
Keyword: fiber length, Artocarpus odoratissimus, tension wood, MFA, opposite wood

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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