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  • Author: C Rui x
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Changes in Higher Fatty Acids and Related Biochemical Characteristics of Flue-cured Tobacco during Aging

Abstract

The purpose of this study was to investigate the changes in higher fatty acids and related biochemical characteristics of flue-cured tobacco during the process of aging. The concentration of total lipids in flue-cured tobacco decreased gradually during natural aging, but the concentration of individual principal higher fatty acids in flue-cured tobacco changed much differently during aging. Myristic acid (C14:0) increased constantly during the whole aging process. Stearic acid (C18:0) and oleic acid (C18:1) increased at the initial stages of aging and reached maximum contents after one year of aging, but decreased thereafter. Palmitic acid (C16:0), linoleic acid (C18:2), and linolenic acid (C18:3) decreased constantly throughout aging, especially the linolenic acid content which decreased drastically. Furthermore, the ratio of unsaturated fatty acids (C18:1; C18:2; C18:3) and saturated fatty acids (C14:0; C16:0; C18:0) decreased continuously during aging, from 1.00 at the initial stage to 0.43 at the end of aging, when it seemed to be stabilized. The maximum rate of decrease of the ratio was between 12 to 18 mo during aging. The activity of lipoxygenase (LOX) and peroxidation value (POV) initially increased and reached their highest levels after 6 mo of aging, but steadily decreased thereafter. The acid value (AV) and malondialdehyde (MDA) content increased during the first 12 mo of aging, then decreased rapidly after 12 and 18 mo, respectively.

Open access
Using thermal tracers to estimate flow velocities of shallow flows: laboratory and field experiments

Abstract

Accurate measurement of shallow flows is important for hydraulics, hydrology and water resources management. The objective of this paper is to discuss a technique for shallow flow and overland flow velocity estimation that uses infrared thermography. Laboratory flumes and different bare, vegetated and paved field surfaces were used to test the technique. Results show that shallow flow surface velocities estimated using thermal tracers and infrared technology are similar to estimates obtained using the Acoustic Doppler Velocimeter; similar results were also obtained for overland flow velocity estimates using thermography, here comparing with the dye tracer technique. The thermographic approach revealed some potential as a flow visualization technique, and leaves space for future studies and research.

Open access
Face To Face Intercultutral Workshops: Are They Worth The Money?

Abstract

A series of two-week international workshops was held in Joensuu, Finland during February 2010, in Glasgow, Scotland in February 2011 and again in Nicosia, Cyprus during February 2012. Entitled “Intercultural Innovation Insight Workshop” (3EYES), they were sponsored by the European Lifelong Learning programme. Students from Portugal, Cyprus, Czech Republic, Finland and the United Kingdom were placed in multi-cultural teams of five. Each team had two product designers, one graphic designer, one financial and one marketing student. They were set the task of devising new product ideas for a local company and they had two weeks within which to do it. These intensive workshops comprised lectures and practical tutorials as well as ideation sessions for the new product ideas and represent one way in which international issues may be appreciated and accommodated. During the first innovation camp the students examined product futures for a fairly large Finnish ceramics company, the Glasgow workshop liaised with a micro-company and during the third 3EYES workshop, the Municipality of Nicosia was helped in its bid to become the European City of Culture 2017. All three events dealt with a completely different clientele: the first was a medium sized company, the second a micro company and the third a Municipal authority. The output of the first two was expected to be a physical product or product idea whereas the third did not need to be a product of any sort. The previous paper, which was delivered in the South African conference last year, compared the first two events and discussed issues of social responsiveness, shared goals and identity. Now that the third (and last) event has taken place, it is time to take stock. We conclude that the students gain greatly from both cultural and functional interaction on a way that cannot be reproduced by means of local teaching. This experience is attitude forming and can transform motivation. It also has the desired effect of increasing the desire to go on Erasmus placements in subsequent years. The perceptions from staff who attended are compared with similar reflections from staff who worked on a different, video conference based, approach. The differences in the financial sustainability of such projects are discussed and the benefits of each model evaluated.

Open access