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Experimental study of air cargo temperature variations and its impact on mango quality
(2024-04-01)
Chaomuang, N.
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Laguerre, O.
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Denis, A.
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Paviet Salomon, Y.
;
Mawilai, P.
An air cargo supply chain for fresh mango was investigated from Thailand to France. Measurements of air temperature, air relative humidity, and fruit (peel) temperature were conducted using thermo-hygrometer data loggers in cartons. In a Unit Load Device (ULD) containing 148 cartons, twenty-seven instrumented cartons were placed at different positions to observe spatial and temporal temperature variations during 12 h cruising. At the destination, mango quality attributes were assessed at different time-points during 15-day storage at 16.1 °C and 21.6 °C. Throughout the supply chain, fruit temperatures ranged from 16.6 °C to 30.5 °C. During cruising, fruit temperatures in upper cartons remained almost constant, whereas base carton temperatures continuously decreased from 26.1 °C to 18.1 °C. Because of a short cruising period in comparison to a storage duration at the destination and proper ambient temperature condition during the experiment, carton position in the ULD had no discernible impact on fruit quality during storage. Fruit stored at 16.1 °C preserved superior fruit quality compared to 21.6 °C storage. For the same storage temperature, better quality of fruits stored in Thailand demonstrated the impact of air shipment on product degradation. The measured temperature and relative humidity evolutions were used as input parameters of a mass loss evolution model. A comparison with the measured data exhibited good agreement (RMSE < 1.8 % mass loss). Considering 10 % mass loss as a critical value, this model allows an estimation of the product shelf life based on a supply chain scenario.
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Influence of long-distance air transport conditions on horticultural product quality: Case study of fresh mango shipment from Thailand to France
(2023-08-01)
Laguerre, O.
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Duret, S.
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Chaomuang, N.
;
Denis, A.
;
Derens-Bertheau, E.
Four instrumented boxes of mangoes Mangifera indica L. cv. “Nam Dok Mai” were shipped from Bangkok, Thailand, to Paris, France, without control of the boxes’ positions on the aircraft. Two boxes were shipped via a direct flight and two boxes were shipped via an indirect flight. For each box, the internal air temperature, the external air temperature and relative humidity and surface temperature of two fruits were recorded throughout the supply chain from a packing house in Thailand to a storage room in France. A maximum fruit temperature of 33 °C (during transport from an orchard to the packing house) and a minimum fruit temperature of 8 °C (in a cold room of the logistics company following arrival at the airport in France via the indirect flight) were observed. The slight temperature difference between the air and the fruit surface temperature (< 1 °C on average) for both direct and indirect flights suggests that the air was stagnant inside the box and, thus conduction was the main heat transfer mode. Models of product temperature, mass loss, and peel color changes throughout the supply chain were developed. The numerical and the experimental values were in good agreement. These models were able to predict the product mass loss and peel color evolution as a function of a supply chain scenario.
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Exploring Research Trends in Air-rail Passenger Transport Relationships Through a Content-based Analysis
(2022-01-01)
Rattanakijsuntorn, Waralee Peetawan
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Sualoy, Nitjanan
;
Pienpookhao, Kittiwadee
Background: Air and rail passenger transport was initially considered to be competitive. However, as both modes have been developed, several other forms of relationships have been introduced and become more complicated, leading to the investigation of research trends in the air-rail passenger transport relationship. Gap: There are few studies on the relationships between air and rail passenger transport, lacking research synthesis application. Aims: This paper classifies and analyzes the relationships between air and rail passenger transport based on research publications between January 2006 and December 2020. Objectives: The objective of this study is 1) to investigate the possible forms of relationships the air-rail passenger transport based on existing studies, 2) to reveal research themes and trends, and 3) to propose research potentials in the air-rail passenger transport. Methods: The study uses a content-based analysis by deriving research articles from transportation and databases. A total of 472 articles were initially identified and screened. One hundred and forty-five articles were included in the final synthesis. Results: Air-rail relationships were categorized as a modal comparison, competition, cooperation, integration and influence. Research has been found to rely heavily on the mixture of modal competition, integration and influence. Furthermore, it has been pointed out that the influence between air and rail passenger transport has a one-way effect; air carriers are affected by the entrance of high-speed trains but not in a reverse direction. China has been an emerging context of this topic over the past five years and is likely to dominate the air-rail research due to its extensive high-speed rail networks and vast developments in large airports. Conclusion: In terms of the air-rail infrastructure development, it was suggested that modal cooperation was outdated due to lacking seamless connectivity features. Future research might explore the deficient research disciplines, including transport sustainability, business practices and tourism, as well as the impact of the coronavirus disease pandemic in reshaping the air-rail passenger transport industry.

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