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: Karakteristik Anatomi dan Sifat Fisis Kayu Terap (Artocarpus sp.) dan Kayu Nyatoh (Palaquium spp.) Asal Kalimantan Utara
Abstrak: Penelitian ini bertujuan untuk menilai kecocokan kayu terap (Artocarpus sp.) dan kayu nyatoh (Palaquium spp.) asal hutan alam di Provinsi Kalimantan Utara sebagai bahan baku industri perkayuan melalui kajian struktur anatomi dan sifat fisisnya. Struktur makroskopis diamati secara langsung dengan lup 15X, sedangkan struktur mikroskopisnya dengan mikroskop cahaya. Dimensi serat diukur melalui sediaan maserasi, sedangkan sifat fisis diukur dengan prosedur standar yang dimodifikasi. Hasil penelitian menunjukkan bahwa kedua jenis kayu yang diteliti berserat lurus hingga berpadu; porositas tata baur dalam pola radial, bidang perforasinya sederhana, noktah antar pembuluh selang-seling, dan berisi tilosis; jari-jari multiseriat 1-3 seri, dan heteroseluler. Pori-pori kayu nyatoh dominan bergabung 2-6 sel, sedangkan pada terap dominan soliter meski ada yang bergabung 2-3 sel serta berisi endapan berwarna. Parenkim aksial kayu nyatoh berbentuk pita tangensial panjang dalam jarak yang teratur, sedangkan pada terap berupa aliform hingga aliform bersambung. Dengan BJ 0.44 (terap) dan 0.33 (nyatoh), serta dengan mutu serat yang masuk kedalam Kelas II, maka kedua jenis kayu yang diteliti dapat digunakan sebagai bahan baku panel kayu dan konstruksi ringan, serta pulp dan kertas. Kayu nyatoh juga dapat digunakan sebagai bahan baku industri mebel.
Keyword: Artocarpus sp., hutan alam, Palaquium spp., sifat fisis, struktur anatomi

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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