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Start Over Topic weibull distribution Publication Year Range Last 10 years
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1. Adequacy of dual-variable Weibull failure distribution for oil-impregnated paper under pulsating DC voltage.

Author

Li, Jian, Bao, Lianwei, Zhang, Jing, and Li, Xudong

Subjects
*PULSATION (Electronics), *WEIBULL distribution, *PAPER, *DIRECT currents, *ELECTRIC potential, *FAILURE analysis
Abstract

This paper presents an experimental work investigating the failure data of oil-impregnated paper under pulsating DC voltage. The failure data of the oil-impregnated paper specimens were obtained through constant voltage stress tests; the Weibull distribution was used to estimate the statistical distribution of failure data. The exponential function (EF) and the inverse power function (IPF) were used to modify the Weibull distribution of failure data, so as to obtain two dual-variable Weibull failure distributions (WFDs), which were used to analyze failure data of oil-paper specimens obtained under pulsating DC and individual DC and AC voltages. Their adequacies were evaluated by using failure data obtained through the constant stress tests under various voltages. Both EF-modified and IPF-modified WFDs show more adequacy for failure data of oil-paper insulation under DC and pulsating DC voltages than AC voltages. The EF-modified WFD was more adequate than IPF-modified WFD in estimating the statistical distribution of failure data. [ABSTRACT FROM PUBLISHER]

Published
2016
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2. Migration kinetics of four photo-initiators from paper food packaging to solid food simulants

Author

Gushuai Tao, Chuanyi Peng, Xiaochun Wan, Juzhou Zhang, Huimei Cai, Liang Zhang, Ruyan Hou, Yue Sun, and Shuilin Ji

Subjects
Paper, Materials science, Health, Toxicology and Mutagenesis, Composite number, Food Contamination, Toxicology, 01 natural sciences, chemistry.chemical_compound, 0404 agricultural biotechnology, Composite material, Porosity, Weibull distribution, chemistry.chemical_classification, Photosensitizing Agents, 010401 analytical chemistry, Public Health, Environmental and Occupational Health, Food Packaging, cardboard, 04 agricultural and veterinary sciences, General Chemistry, General Medicine, Polymer, Polyethylene, 040401 food science, 0104 chemical sciences, Food packaging, Kinetics, chemistry, visual_art, visual_art.visual_art_medium, Kraft paper, Food Science
Abstract

The migration behaviour of four photo-initiators (BP, EHA, MBP and Irgacure 907) was studied by ‘printing’ onto four different food-packaging materials (Kraft paper, white cardboard, Polyethylene (PE)-coated paper and composite paper) and tracking movement into the food simulant: Tenax-TA (porous polymer 2,6-diphenyl furan resin). The results indicated that the migration of the photo-initiators was related to the molecular weight and log Ko/w of each photo-initiator. At different temperatures, the migration rates of the photo-initiators were different in papers with different thicknesses. The amount of each photo-initiator found in the food was closely related to the food matrix. The Weibull model was used to predict the migration load into the food simulants by calculating the parameters τ and β and determining the relationship of the two parameters with temperature and paper thickness. The established Weibull model was then used to predict the migration of each photo-initiator with respect to different foods. A two-parameter Weibull model fitted the actual situation, with some deviation from the actual migration amount.

Published
2017
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