Judul: Pengaruh Pelapisan Edibel Terhadap Umur Simpan dan Mutu Buah Naga Terolah Minimal yang Disimpan dalam Kemasan Atmosfer Termodifikasi
Abstrak: Minimally processed dragon fruit has a limited shelf life which can be extended if the fruits are subjected to edible coating and modified atmosphere packaging combined with low temperature storage. The objective of this study was to determine the influence of edible coating used for minimally processed dragon fruit on its quality and shelf life. Objective and organoleptic tests were conducted every two days observing the critical quality parameters of edible coated minimally processed fruits. The results indicated that selected glucomannan concentration for edible coating solution was 0.55%. The study recommended that edible coated minimally processed dragon fruits stored in a packaging made out of LDP no.4 as the bottom container with a ratio of 229 g fruits/180 cm2 areal, and stored at 5°C using stretch film for the modified atmosphere packaging. At the validated packaging design, edible coated minimally processed dragon fruits had four day shelf life with an organoleptic score of 3.5 in the range of 1-5.
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Judul: Pengaruh Pelapisan Lilin dan Suhu Penyimpanan terhadap Masa Simpan Buah Naga Super Red (Hylocereus costaricensis)
Abstrak: Hylocereus costaricensis or super red dragon fruit has a short shelf life due to its withered scales that affects consumers‟ preference. Coating application and low temperature storage were expected to extend the shelf life. The aim of this research is to study the application of coating and the impact of its interaction with storage temperature on super red dragon fruit shelf life. Coating using cera alba wax with and without stearin as the substitution were applied in dragon fruits that then were stored at room temperature, 12oC, and 5oC. The analysis of scale freshness percentage, weight loss, firmness, and ion leakage were done every 2 days for room temperature and 7 days for low temperature. The result showed that dragon fruits could be stored for 4 days at room temperature, 14 days at 12oC, or 21-28 days at 5oC. Coating treatment gave no effect unless combined with low temperature. Storage of 5oC without coating treatment was able to maintain fruit quality, particularly on its weight loss. The stearin could be used as cera alba substitution that it gave no negative effect.
Keyword: storage temperature, shelf life, dragon fruit, coating

Judul: The use of homotopy perturbation methode to solve fuzzy volterra  integral equations
Abstrak: Most phenomena in nature can be explained in mathematical models, such as fuzzy volterra integral equation. The fuzzy volterra integral equation is a nonlinear integral problem, which is usually dificult to solve by an analytical solution. In this paper, fuzzy volterra integral equation is solved using perturbaion homotopy method, which can be written as a power series in p and satisfies a certain homotopy fuction. This manuscript discuss two case studies, i.e. the case of linear and trigonometric kernel function. The result shows that greater approximation order being used, the wider convergence solution area wil be.
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