Saffron is the most precious and expensive agricultural product. A dehydration treatment is necessary to convert Crocus sativus L. stigmas into saffron spice. To the best of our knowledge, no information on mass trans...Saffron is the most precious and expensive agricultural product. A dehydration treatment is necessary to convert Crocus sativus L. stigmas into saffron spice. To the best of our knowledge, no information on mass transfer parameters of saffron stigmas is available in the literature. This study aimed at investigating the moisture transfer parameters and quality attributes of saffron stigmas under infrared treatment at different temperatures（60,70, …, 110 ℃）. It was observed that the dehydration process of the samples occurred in a short accelerating rate period at the start followed by a falling rate period. The effective moisture diffusivity and convective mass transfer coefficient were determined by using the Dincer and Dost model. The diffusivity values varied from1.1103 × 10^-10m^2·s^-1to 4.1397 × 10^-10m^2·s^-1 and mass transfer coefficient varied in the range of 2.6433 × 10^-7–8.7203 × 10^-7m·s^-1. The activation energy was obtained to be 27.86 kJ·mol^-1. The quality assessment results showed that the total crocin content increased, when the temperature increased up to90 ℃ but, in higher temperatures, the amount of crocin decreased slightly. The total safranal content of the samples decreased slightly when drying temperature increased from 60 ℃ to 70 ℃ and then continuously increased up to 110 ℃. Also, the amount of picrocrocin increased from 83.1 to 93.3 as the drying temperature increased from 60 ℃ to 100 ℃.展开更多
More than just a drink, tea embodies social, cultural, economic and political meanings through time and across cultures. There is an essential tie between media and this meaning-making process. Media often create and ...More than just a drink, tea embodies social, cultural, economic and political meanings through time and across cultures. There is an essential tie between media and this meaning-making process. Media often create and carry the visions of health, nature, tranquility, and prosperity offered by tea. This mediated imaginary seems to persist even in the face of vast human inequalities and suffering and irreversible negative environmental impacts through the current practice of tea production under global conglomerates. Through textual analysis of media narratives of Teavana, a well-known tea brand, this project explores how media＇s mythic narratives potentially naturalize and celebrate the current production practice and the conspicuous consumption of tea, and silence the human suffering and environmental destruction endured, in order to gratify the very practice and consumption promoted by media.展开更多
文摘Saffron is the most precious and expensive agricultural product. A dehydration treatment is necessary to convert Crocus sativus L. stigmas into saffron spice. To the best of our knowledge, no information on mass transfer parameters of saffron stigmas is available in the literature. This study aimed at investigating the moisture transfer parameters and quality attributes of saffron stigmas under infrared treatment at different temperatures（60,70, …, 110 ℃）. It was observed that the dehydration process of the samples occurred in a short accelerating rate period at the start followed by a falling rate period. The effective moisture diffusivity and convective mass transfer coefficient were determined by using the Dincer and Dost model. The diffusivity values varied from1.1103 × 10^-10m^2·s^-1to 4.1397 × 10^-10m^2·s^-1 and mass transfer coefficient varied in the range of 2.6433 × 10^-7–8.7203 × 10^-7m·s^-1. The activation energy was obtained to be 27.86 kJ·mol^-1. The quality assessment results showed that the total crocin content increased, when the temperature increased up to90 ℃ but, in higher temperatures, the amount of crocin decreased slightly. The total safranal content of the samples decreased slightly when drying temperature increased from 60 ℃ to 70 ℃ and then continuously increased up to 110 ℃. Also, the amount of picrocrocin increased from 83.1 to 93.3 as the drying temperature increased from 60 ℃ to 100 ℃.
文摘More than just a drink, tea embodies social, cultural, economic and political meanings through time and across cultures. There is an essential tie between media and this meaning-making process. Media often create and carry the visions of health, nature, tranquility, and prosperity offered by tea. This mediated imaginary seems to persist even in the face of vast human inequalities and suffering and irreversible negative environmental impacts through the current practice of tea production under global conglomerates. Through textual analysis of media narratives of Teavana, a well-known tea brand, this project explores how media＇s mythic narratives potentially naturalize and celebrate the current production practice and the conspicuous consumption of tea, and silence the human suffering and environmental destruction endured, in order to gratify the very practice and consumption promoted by media.
