Judul: Kemasan Aktif Buah Salak Pondoh (Salacca edulis Reinw.) dengan Penyerap Gas Etilen dan Gas Karbondioksida
Abstrak: Snake fruit (Salacca edulis Reinw.) is one of the leading agricultural commodities in Indonesia which is currently widely consumed by the public, unfortunately fruits do not have a long shelf life after harvest. This study was purposed to obtain a combination of absorbing ethylene gases and CO2 gases produced from the respiration of fruits in order to extend shelf life. There are two combinations of absorbent material used, the chalk with zeolite and lime with activated charcoal. Zeolites and activated charcoal has a role to absorb the ethylene gas produced during the storage of snake fruit, while the role of lime to absorb CO2 gas produced from the salak respiration during storage. Concentration of each absorber used are: limestone (2.5%), zeolite (2.5%) and activated charcoal (1.5%). Type of plastic used to package the snake fruit is a type of plastic PP and PET with a thickness of 0.8 μm plastic. There are two packaging techniques that applied, with vacuum and normal. Temperature used in the fruits during their storage is 16-20° C with a humidity of 99%. The results of observations, a combination of absorbent materials which can increase the shelf life of salak and produces the smallest percentage of damage is a combination of lime with a zeolite absorbent material in plastic PETnormal. The combination was able to increase the shelf life up to 26 days.
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Judul: Aplikasi Karbon Aktif sebagai Penyerap Etilen dan Teknik Pengemasan pada Salak Pondoh (Salacca edulis R.)
Abstrak: Salak pondoh is a highly commercial fruit, but has a short self life, so it decays easily. To ercome this problem, inhibition of its respiration rate can be carried out, i.e. by the adjustment of and CO2 compositions through the packaging, and adsorption of ethylene by giving of ethylene sorbent, such as activated carbon. The objective of this research was to increase the self life of alak by using activated carbon as an ethylene absorbent. This study was carried out by packing salak to polypropylene (PP) and polyethylene (PE) plastic bags with the packaging techniques (holes, rmal, and vacuum), and the addition of activated carbon (3% and 6%), and then were stored it in a Dol chamber at temperature of 15-20 °C and RH of 90-99%. The parameters tested were weight sses, percentage of damage, total suspended solids, and vitamin C. The best treatment obtained Som this study was packaging using PP plastic with vacuum technique and activated carbon dosage 3%. That condition was able to maintain the self life of salak up to 24 days of storage, 14 days Onger. Application of 3% addition of activated carbon was able to maintain the self life for 7 days Tonger at the maturity level of 90% and 11 days longer at the maturity level of 80%, compared to no addition of activated carbon and packed with PP plastic in vacuum condition.
Keyword: Packaging, Salak pondoh, Activated carbon, Eethylene absorbent, Self life

Judul: Uji Robust T2-Hotelling dengan Menggunakan Penduga Minimum Covariance Determinant
Abstrak: Hotelling’s T2 statistic is a good statistic for inference about the mean of a multivariate normal population. In Hotelling’s T2 statistic, approximation with Bonferroni confidence intervals provides shorter interval than T2 confidence intervals. Therefore, to find the mean of a multivariate normal population, simultaneous t-intervals based on the Bonferroni method is often applied. However, hypothesis test and confidence intervals based on T2 statistic can be significantly affected by outliers in a set of multivariate normal data. Therefore, to find a good estimator for the mean of a multivariate normal population, the Minimum Covariance Determinant (MCD) estimator is used. To increase the efficiency of the MCD estimator, this test statistic is applied using the reweighted MCD which gives weights to the mean and covariance based on the robust of the observations.
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