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.
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Judul: Keawetan Alami Kayu Ulin (Eusideroxylon zwageri T. et B.) pada umur yang berbeda dari hutan tanaman di Kalimantan Selatan
Abstrak: Kayu Ulin (Eusideroxylon zwageri T. et B.) telah lama dikenal memiliki mutu yang tinggi, tahan terhadap serangan rayap dan berbagai kondisi alam, namun daya regenerasi dan pertumbuhannya sangat lambat. Semakin gencarnya permintaan akan kebutuhan kayu Ulin, maka keberadaan jenis ini di hutan alam mulai terancam. Saat ini pemerintah Kalimantan Selatan dan perusahaan HTI di Kalimantan sudah mulai membudidayakan Ulin dan menggalakkan penanaman kayu Ulin pada hutan tanaman guna mengantisipasi kepunahan dan keberlangsungan tetap tersedianya Ulin di pasaran. Semakin berkembangnya hutan tanaman Ulin, sebagai bahan pertimbangan dalam penurunan umur tebang, maka perlu dilakukan penelitian mengenai keawetan alami kayu Ulin yang berasal dari hutan tanaman pada umur pohon yang lebih muda. Penelitian ini menggunakan kayu Ulin yang berasal dari hutan tanaman di Kalimantan Selatan dengan umur 39 tahun (diameter 30 cm) dan umur 26 tahun (diameter 16 cm) serta rayap tanah Coptotermes curvignathus Holmgren. Metode pengujian mengacu pada prosedur dari Standar Nasional Indonesia (SNI) 01.7207-2006 untuk uji laboratorium dan standar American Society for Testing and Material (ASTM) D 1758-06 untuk uji lapang. Parameter yang dilihat adalah nilai kehilangan berat, mortalitas rayap tanah dan tingkat kerusakan contoh uji.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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