Judul: Karakteristik MFA (Microfibril Angle) dan Serat pada Tiga Umur Kayu Mangium (Acacia mangium Willd.)
Abstrak: Mangium (Acacia mangium Willd.) merupakan salah satu jenis yang dikembangkan sebagai tanaman utama untuk program Hutan Tanaman Industri di Indonesia. Faktor yang mendorong penanaman jenis ini ialah pertumbuhannya yang cepat dan tidak membutuhkan persyaratan tempat tumbuh yang tinggi. Tujuan dari penelitian ini adalah untuk mengidentifikasi ciri-ciri anatomi terutama karakteristik sudut mikrofibril (MFA) dan serat serta kadar air dan berat jenis kayu mangium. Sampel kayu berasal dari tiga umur pohon yaitu 5, 6, dan 7 tahun yang ditanam di areal hutan tanaman Perhutani Parung Panjang. Karakter MFA dan serat kayu dievaluasi melalui sediaan maserasi yang dibuat dengan metoda Schulze. Hasil penelitian menunjukkan bahwa MFA kayu mangium yang berumur 5, 6 dan 7 tahun masing-masing adalah 23.4˚, 22.3˚ dan 21.8˚. Panjang serat kayu yang berumur 5, 6 dan 7 tahun masing-masing adalah 1016.3 μm, 986.2 μm dan 1019.4 μm. Berdasarkan karakteristik serat, kayu mangium dari 5, 6 dan 7 tahun diklasifikasikan ke dalam Kelas Kualitas II. Nilai rata-rata kadar air kayu adalah 15 % dan berat jenis sekitar 0,46.
Keyword: Acacia mangium, sudut mikrofibril, panjang serat, berat jenis

Judul: Anatomical Structure and Fiber Quality Analysis of Mangium Wood from Three Different Generations. Supervised
Abstrak: Struktur anatomi dan mutu serat kayu mangium (Acacia mangium) dari tiga generasi (F0, F1 dan F2) hasil kegiatan pemuliaan pohon perlu diteliti karena kegiatan tersebut sedikit banyak akan mempengaruhi sifat dan karakteristik kayu yang dihasilkan. Penelitian ini bertujuan untuk mengkaji struktur anatomi dan mutu serat kayu mangium hasil kegiatan pemuliaan antar tiga generasi yang berbeda. Bahan yang digunakan adalah kayu mangium tiga generasi dari tegakan mangium umur 10 tahun hasil kegiatan pemuliaan pohon. Struktur anatomi dianalisis secara makro- dan mikroskopis mengikuti prosedur standar baku, sedangkan kelas mutu seratnya dievaluasi berdasarkan panjang serat dan nilai turunan dimensi serat. Hasil penelitian menunjukkan struktur anatomi dan mutu serat kayu mangium yang diteliti secara keseluruhan tidak berbeda antar ketiganya, kecuali dalam hal ukuran dan proporsi beberapa sel penyusunnya. Serat kayu ketiga generasi masuk dalam Kelas Mutu II. Kegiatan pemuliaan pohon mengakibatkan porsi teras dan kekuatan kayu berkurang, kayu menjadi lebih porous, serat semakin panjang namun tebal dindingnya semakin tipis., The anatomical structure and fiber quality of mangium (Acacia mangium) wood from three generations (F0, F1 and F2) as a result of breeding activities need to be investigated because the treatment applied could affect the characteristics and properties of wood produced. This study aims to examine the anatomical structure and fiber quality of A. mangium wood resulting from tree breeding/tree improvement activities among three different generations. The material used is three generations of mangium wood from a 10-year-old breeding stand. Anatomical structures were analyzed macro- and microscopically following standard procedures, while the fiber quality class was evaluated based on fiber length and fiber dimension derivative values. The results showed that the overall anatomical structure and fiber quality of the studied mangium wood did not differ among the three, except for the size and proportion of some of the constituent cells. Wood fibers from all generations are categorized as Quality Class II. Tree breeding activities result in a reduction in the portion of the heartwood and the strength of the wood. The wood becomes more porous, the fiber becomes longer but the wall thickness becomes thinner.
Keyword: Acacia mangium, anatomical structure, breeding program, fiber dimensions, three generations

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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