391 research outputs found
Optimization of the appearance quality in CO2 processed ready-to-eat carrots through image analysis
A high-pressure CO2 process applied to ready-to-eat food products guarantees an increase of both their microbial safety and shelf-life. However, the treatment often produces unwanted changes in the visual appearance of products depending on the adopted process conditions. Accordingly, the alteration of the visual appearance influences consumersâ perception and acceptability. This study aims at identifying the optimal treatment conditions in terms of visual appearance by using an artificial vision system. The developed methodology was applied to fresh-cut carrots (Daucus carota) as the test product. The results showed that carrots packaged in 100% CO2 and subsequently treated at 6 MPa and 40âŠC for 15 min maintained an appearance similar to the fresh product for up to 7 days of storage at 4âŠC. Mild appearance changes were identified at 7 and 14 days of storage in the processed products. Microbiological analysis performed on the optimal treatment condition showed the microbiological stability of the samples up to 14 days of storage at 4âŠC. The artificial vision system, successfully applied to the CO2 pasteurization process, can easily be applied to any food process involving changes in the appearance of any food product
Photoanodes for Aqueous Solar Cells: Exploring Additives and Formulations Starting from a Commercial TiO2 Paste
Whereas the commercialization of dyeâsensitized solar cells (DSSCs) is finally proceeding taking advantage of their low cost and tunable optical features, such as colour and transparency for both indoor and buildingâintegrated applications, the corresponding aqueous counterpart is still at its infancy. As the TiO2 electrode is a fundamental component for hybrid solar cells, this work investigates the effect of different molecular (αâterpineol, propylene carbonate) and polymeric (polyethylene oxide, polyethylene glycol, carboxymethyl cellulose and xanthan gum) additives that can be introduced into a commercial TiO2 paste for for screenâprinting (or doctor blade). Among all, the addition of polyethylene glycol leads to the best cell performances, with markedly increased shortâcircuit current density (+18â%) and power conversion efficiency (+48â%) with respect to the pristine (commercial) counterpart. When further explored at different concentration levels, electrodes fabricated from polyethylene glycolâbased pastes show different morphologies, thicknesses and performances, which are investigated through (photo)electrochemical, structural, physicalâchemical and microscopic techniques
Photoanodes for Aqueous Solar Cells: Exploring Additives and Formulations Starting from a Commercial TiO2 Paste
Whereas the commercialization of dyeâsensitized solar cells (DSSCs) is finally proceeding taking advantage of their low cost and tunable optical features, such as colour and transparency for both indoor and buildingâintegrated applications, the corresponding aqueous counterpart is still at its infancy. As the TiO2 electrode is a fundamental component for hybrid solar cells, this work investigates the effect of different molecular (αâterpineol, propylene carbonate) and polymeric (polyethylene oxide, polyethylene glycol, carboxymethyl cellulose and xanthan gum) additives that can be introduced into a commercial TiO2 paste for for screenâprinting (or doctor blade). Among all, the addition of polyethylene glycol leads to the best cell performances, with markedly increased shortâcircuit current density (+18â%) and power conversion efficiency (+48â%) with respect to the pristine (commercial) counterpart. When further explored at different concentration levels, electrodes fabricated from polyethylene glycolâbased pastes show different morphologies, thicknesses and performances, which are investigated through (photo)electrochemical, structural, physicalâchemical and microscopic techniques
Photoanodes for Aqueous Solar Cells: Exploring Additives and Formulations Starting from a Commercial TiO2 Paste
Whereas the commercialization of dyeâsensitized solar cells (DSSCs) is finally proceeding taking advantage of their low cost and tunable optical features, such as colour and transparency for both indoor and buildingâintegrated applications, the corresponding aqueous counterpart is still at its infancy. As the TiO2 electrode is a fundamental component for hybrid solar cells, this work investigates the effect of different molecular (αâterpineol, propylene carbonate) and polymeric (polyethylene oxide, polyethylene glycol, carboxymethyl cellulose and xanthan gum) additives that can be introduced into a commercial TiO2 paste for for screenâprinting (or doctor blade). Among all, the addition of polyethylene glycol leads to the best cell performances, with markedly increased shortâcircuit current density (+18â%) and power conversion efficiency (+48â%) with respect to the pristine (commercial) counterpart. When further explored at different concentration levels, electrodes fabricated from polyethylene glycolâbased pastes show different morphologies, thicknesses and performances, which are investigated through (photo)electrochemical, structural, physicalâchemical and microscopic techniques
A model of spatially restricted transcription in opposing gradients of activators and repressors
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/102118/1/msb201248-sup-0001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/102118/2/msb201248.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/102118/3/msb201248.reviewer_comments.pd
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