Judul: BAMBANG GIANTO. PHYSICAL AND MECHANICAL PROPERTIES OF PINE (Pinus merkusii Jungh et De Vriese) ORIGINATED FROM ACEH AND TAPANULI THAT GROWN IN BOGOR.
Abstrak: Kayu merupakan bahan baku penting bagi bangunan dan industri ditinjau dari aspek kekuatan, estetika dan biaya pengolahan yang rendah sehingga banyak diminati untuk berbagai kebutuhan. Penelitian ini bertujuan untuk menganalisis pengaruh asal pohon pinus dan metode perbanyakan terhadap sifat fisis dan mekanis kayu pinus yang ditanam di Fakultas Kehutanan dan Lingkungan, Dramaga, Bogor. Berdasarkan hasil penelitian, dapat disimpulkan bahwa faktor asal pohon memberikan pengaruh yang nyata terhadap sifat fisis (kerapatan, berat jenis, susut arah radial, susut arah tangensial) dan sifat mekanis (kekerasan radial dan kekerasan tangensial). Faktor metode perbanyakan tidak berpengaruh nyata terhadap sifat fisis dan menkanis kecuali pada susut arah tangensial. Faktor interaksi antara asal pohon dan metode perbanyakan hanya berpengaruh nyata pada kerapatan, berat jenis, susut arah radial, susut arah tangensial dan kekerasan arah radial serta tangensial. Pengaruh lokasi tempat tumbuh yang berbeda dengan asal pohon terbukti mempengaruhi sifat fisis dan mekanis kayu pinus dibandingkan dengan metode perbanyakan.
Keyword: Pinus, Biji, grafting, sifat fisis, sifat mekanis

Judul: Sifat Mekanis Kayu Pinus (Pinus merkusii Jungh. et de Vriese) Berbagai Strain Asal Sumatera
Abstrak: Pinus (Pinus merkusii) merupakan salah satu jenis kayu yang banyak digunakan oleh industri perkayuan di Indonesia. Berdasarkan sebaran alaminya, pinus berada pada tiga lokasi di wilayah Sumatera, yaitu Aceh, Tapanuli, dan Kerinci. Pengujian sifat mekanis dapat dipengaruhi oleh beberapa faktor seperti teknik silvikultur dan kedalaman kayu dalam satu log. Penelitian ini bertujuan menganalisis sifat mekanis akibat perbedaan teknik silvikultur, bentuk spesimen, serta kedalaman kayu pada tiga strain pinus asal Sumatera. Pengujian sifat mekanis dilakukan menggunakan metode non destruktif dan destruktif. Faktor teknik silvikultur, faktor spesimen uji, faktor posisi transduser, dan kedalaman kayu serta interaksinya tidak memberikan pengaruh terhadap nilai yang dihasilkan pada pengujian non destruktif. Faktor teknik silvikultur dan kedalaman kayu, serta interaksinya tidak berpengaruh nyata terhadap nilai sifat mekanis yang dihasilkan pada pengujian destruktif. Namun demikian pada pengujian lentur statis, faktor kedalaman kayu berpengaruh terhadap nilai yang dihasilkan. Hal itu kemungkinan terjadi karena adanya perbedaan nilai kerapatan dan berat jenis pada sampel uji lentur statis di bagian gubal dan terasnya., Pine (Pinus merkusii) is one type of wood that is widely used by the wood industry in Indonesia. Based on its natural distribution, pine is located in three locations in Sumatra, namely Aceh, Tapanuli, and Kerinci. Mechanical testing can be affected by several factors such as silvicultural techniques and wood depth in one log. This study aimed to analyze the mechanical properties due to difference silvicultural techniques, specimen, and wood depth in three strains from Sumatera. Mechanical properties test is carried out using non-destructive and destructive methods. The silvicultural technique factor, the specimen factor, the transducer position factor, and the depth of the wood and their interactions did not affect the value in the non-destructive test. Silvicultural technique factors and wood depth, as well as their interactions have no significant effect on the value of the mechanical properties in the destructive test. Furthermore, the wood depth factor affects the resulting value on the static bending test. This may be due to differences in the density and specific gravity values of the static bending test samples in the sapwood and heartwood.
Keyword: mechanical properties, pine, silviculture technique, strain

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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