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The rheological behaviour of ‘dulce de leche’ has been studied performing flow curves in
rotational viscometers (Hough et al., 1988; Pauletti et al., 1990; Rovedo et al., 1991) or by
using dynamic oscillatory tests (Navarro et al., 1999). The product shows time-dependent
thixotropic behaviour that could be modelled using Weltman’s model (Pauletti et al., 1990).
The pseudoplastic behaviour with a yield stress of ‘dulce de leche’ has been modelled using
Casson’s and Herschel-Bulkley’s model (Rovedo et al., 1991; Pauletti et al., 1990). From
all the instrumental methods used to characterise the non-oral texture of ‘dulce de leche’,
the yield stress seems to be the most appropriate test to assess the quality of the product
1because it shows the highest discriminating ability and it has the advantage of being a
quick and direct method of testing (Ares et al., 2006).
بافت non-oral یعنی چی اصلا؟ غیر دهانی؟ خنده دار نیست؟ یه همچین چیزی تو رئولوژی نتونستم پیدا کنم
اینم دومیش
To determine the final concentration of the product, a hand-held sugar refractometer was
used, and then the batches were checked to a final reading of approximately 70 g 100 g−1
concentration, as recommended by Hough et al. (1990). Although the refractometer was
easy to use, it only had an accuracy of about ±2% for measuring the final concentration
of the total solids in the ‘dulce de leche’ when taking the clarity of the scale interface
into account. Once the product was ready, and before cooling, 4 mL of vanilla was added
for flavouring and the cooling process was continued with a constant stirring to 50◦C for
packing in 100 g food-grade plastic, screw-top containers
.
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