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Monitoring the hot-air drying process of organically grown apples (cv: Gala) using computer vision
نظارت بر فرایند خشک شدن سیب های ارگانیک در هوا (cv: Gala) با استفاده از بینایی ماشین-2021 The feasibility of using a computer-vision (CV) system embedded in a hot-air dryer for nondestructive and real-time monitoring of the drying behaviour of organic apples was
investigated in the present study. Apple cylinders were subjected to anti-browning treatments with different dipping solutions (water as control, trehalose (4% w/v) or
trehalose þ ascorbic acid (4% w/v and 1% w/v)) and dipping pressures (atmospheric,
101.3 kPa and sub-atmospheric pressure, 50 kPa) followed by drying at 60 C to a final dry
basis moisture content of 0.18 g g1. The CV system was used as an in-line process
analytical technology (PAT) tool to capture images reflecting the physico-chemical changes
during product drying coupled with in-line mass changes and off-line reference analyses.
The spatial and colour changes from the image analysis described well the complex and
non-homogenous nature of apple drying. The results of spatial changes allowed successful
development of accurate linear prediction models for moisture content as a function of
area shrinkage (on scaled variables) with excellent prediction capability (|BIAS| < 8.5 103,
RMSE < 0.04, Adj-R2 ~ ¼ 99%). Also, the CV system identified the differently pre-treated
samples, particularly the dipping pressures as reflected by two linear models and their
respective parameters. The obtained results demonstrate the versatile advantages of CV
systems as an in-line tool for continuous, real-time monitoring of apples during drying.
The insights from this study can provide a platform for applications of CV embedded
‘Smart dryers’ as an efficient monitoring and control system for industrial drying
processes.
Keywords: Malus domestica B. | Image analysis | Dipping treatments | Vacuum impregnation | Smart drying | Area shrinkage |
مقاله انگلیسی |
2 |
Highly thermo-conductive yet electrically insulating material with perpendicularly engineered assembly of boron nitride nanosheets
مواد بسیار رسانای حرارتی و در عین حال عایق الکتریکی با مونتاژ عمودی مهندسی شده نانوصفحات نیترید بور-2021 With rapid evolution of advanced microelectronic devices, thermally conductive polymeric materials with
impressive through-plane thermal conductivity (κ⊥) and remarkable electrical insulating properties are urgently
demanded for efficient thermal management. Assembly of boron nitride nanosheets (BNNS) into polymer matrix
with vertically interconnected conformation was usually adopted. However, impeded by inferior oriented degree
and insufficient overlapped interconnection of BNNS, polymer/BNNS nanocomposites still suffered from a
limited enhancement of κ⊥. In this work, we firstly prepared regenerated cellulose (RC)/BNNS filaments with
high thermal conductivity via wet-spinning method. Then, a tailored polydimethylsiloxane (PDMS)/(RC/BNNS)
filaments nanocomposite with hierarchical assembled architectures is successfully fabricated with customizedmold vacuum impregnation. Numerous bunches of microscopical hybrid filaments penetrate through the
nanocomposite from the bottom to the up, while vertically aligned microscopical BNNS with efficient filler interconnections confined within filaments provide many uniaxial thermal pathways. Attributed to tactfully
engineered phonon pathways, the as-prepared material exhibits a remarkable κ⊥ up to 5.13 W/m K at 27.05 vol%
BNNS loading, outperforming the characters in most literatures. Along with excellent electrical resistance and
extraordinary thermal management performances, this type of nanocomposite with hierarchical structures
provides an effective strategy to thickness-direction heat transfer issues of electronic devices.
Keywords: Through-plane thermal conductivity | Polymer | Boron nitride nanosheets | Vertical orientation |
مقاله انگلیسی |