Judul: Keawetan alami kayu ulin (Eusideroxsylon zwageri T. et B) asal Jambi
Abstrak: Keawetan alami kayu adalah suatu ketahanan kayu secara alamiah terhadap serangan jamur dan serangga dalam lingkungan yang serasi bagi kehidupan organisme bersangkutan (Duljapar, 1996). Keawetan kayu berarti ditentukan oleh daya tahannya terhadap berbagai organisme perusak kayu terutama jamur dan serangga (termasuk rayap). Keawetan alami kayu sangat dipengaruhi oleh konsentrasi zat ekstraktif yang beracun terhadap organisme perusak kayu (Syafii, 1996). Keawetan alami kayu bervariasi sesuai dengan jumlah serta jenis zat ekstraktifnya. Salah satu jenis kayu indonesia yang memiliki keawetan alami yang tinggi adalah kayu ulin (Eusideroxylon zwagerii T. et. B). Kayu ulin termasuk dalam kelas awet I dan berdasarkan percobaan kuburan pun jenis kayu ini masuk kelas awet tersebut. Daya tahan terhadap rayap kayu kering termasuk kelas awet II, tetapi terhadap jamur pelapuk kayu termasuk kelas awet I (Martawijaya dkk, 1989). Di hutan alam Senami (Jambi) sesuai dengan nama lokalnya dikenal empat nama kayu ulin yaitu bulian sirap, bulian tanduk, bulian kapur dan bulian daging Belum ada informasi tentang keawetan alami ke empat kayu tersebut (Irawan, 2001). Penelitian ini bertujuan untuk mengetahui keawetan alami atau daya tahan kayu Ulin bagian gubal dan teras dari Propinsi Jambi terhadap serangan rayap tanah (Coptotermes curvignathus Holmgren) melalui pengujian secara laboratorium. Pengujian kehilangan berat menggunakan standard "Modified Wood Block Test" (MWBT-Test). Pengujian kandungan zat ektraktif kayu ulin dalam pelarut air dingin menggunakan standar TAPPIT 307 pm-88. Pengujian kelarutan zat ekstraktif kayu ulin dalam pelarut air panas menggunakan standar TAPPI T 207 om-88. Pengujian kandungan zat ekstraktif dalam pelarut alkohol benzena menggunakan standar TAPPI T 204 om-88. Rancangan percobaan yang digunakan dalam pengujian secara laboratorium yang berupa kehilangan berat adalah dengan metode Rancangan Acak Lengkap (RAL).
Keyword: Eusideroxsylon zwageri, Ironwood, natural durability

Judul: Keawetan alami kayu ulin (Eusideroxylon zwageri T. et B.) pada umur yang berbeda dari hutan tanaman di Kalimantan Selatan
Abstrak: INTRODUCTION. Ironwood (Eusideroxylon zwageri T. et B.) has long been known having high quality, resistant to termites and other natural condition, but the ability of regeneration and growth is too slow. Nowadays, the presence of this species is in danger because increasing of human needs. The Government of South Kalimantan and plantation forest company are already starting to cultivate and promote planting ironwood on forest in order to anticipate the extinction and to keep the availability of ironwood in market. Consequently, it is important to do research about natural durability of ironwood at young age for logging consideration. MATERIAL AND METHOD. This research was done by using ironwood from Plantation Forest in South Kalimantan, different age and diameter, 39 years old (30 cm diameter) and 26 years old (16 cm), and subterranean termites Coptotermes curvignathus Holmgren. Test method was refered to the procedure of Indonesian National Standard (SNI) 01.7207-2006 for Laboratory test and American Society for Testing and Material (ASTM) Standard for graveyard test. The research parameters is weight loss, mortality of the termites, and degree of damage in the sample.
Keyword: 

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.
Keyword: