Judul: Sifat Fisik Kulit Samak Khrom Domba Ekor Gemuk Dan Domba Ekor Tipis Awet Garam
Abstrak: Sheep is the one of many leather product. Mostly, leather of sheep have size more small and thin than cow and buffalo. Leather of cow and buffalo can make the leather light. The observation consists of experiment using six sheets of sheep leather, respectively. The observation design used on experiment has Direct Randomized Complete Design with three repeatations. Variable analysis of experiment consists of tensile strength and elongation of leather, and torn strength. The experiment result showed that tensile strength value of chrome tanned leather of Javanese fat-tailed and local Javanese thin-tailed not clear different were respectively 42.86 ± 2,12 kg/cm3 ; 38.56 ± 2,16 kg/cm3. The elongation value of chrome tanned leather of Javanese fat-tailed and local Javanese thin-tailed not clear different were respectively 99.25 ± 36,59 % ; 104.03 ± 21,71 %, whereas the torn strength given were respectively 3.57 ± 0.9194 kg/cm3 ; 3.475 ± 0.2947 kg/cm3. The tensile strength, elongation, and torn strength value of chrome tanned leather of Javanese fat-tailed were not clear different than leather of local Javanese thin-tailed. Keywords: Sheep, Tanning, Physical Characteristic,.
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Judul: Karakteristik Kulit Kaki Ayam yang Disamak dengan Krom dan Mimosa serta Ekstrak Kulit Buah Salak (Salacca Edulis Reinw)
Abstrak: Leather tanning is a process to transform the unstable raw skin into more stable form. The aim of this research was to determine characteristics of chicken foot’s skin which tanned using mineral (chromium) and vegetable tanning material (mimosa and salak peel’s extract). This research used chicken foot’s skin tanned with one control and 3 treatments. Each treatment used similar materials, namely; chromium, mimosa and salak peel’s extract, with different concentration. Control treatment consisted of 100% chromium; treatment 1 consisted of tanning material with ratio of 70:20:10; treatment 2 with ratio of 60:20:20 and treatment 3 with ratio of 50:20:30. Each treatment had 3 replications. The observed variables were tensile strength, elongation and tear endurance. Data were analyzed by using analysis of variance. The results showed that tensile strength, elongation and tear endurance of chicken foot’s skin tanned with each treatment showed not significant different (P> 0.05) with the best treatment ratio was 50:20:30.
Keyword: tanning, salak peel, chicken claw’s skin, Bogor Agricultural University (IPB)

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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