2 research outputs found
Simulation of color afterimages: An approach to computing virtual color perception
Afterimages are a common and frequent perceptual phenomenon of everyday life. When looking into a high-intensity
light source and suddenly turning away from it, a temporary “ghost” of the light source remains visible, for a while.
The computer-graphics simulation of afterimages is based on biophysical and mathematical models as published in the
literature. A subordinate of afterimages defined in our research is virtual color perception, that is in our interpretation an
unusual and intense temporary color perception provoked by a rapid change in the color of the incident light. In research,
the modelling of virtual color perception is a field that is by and large untouched. Our publication presents a kinetic model
established to characterize the intensity and duration of virtual color perception as a function of rapid changes in the color
of the incident light
Az A- és E-vitaminok szabvány szerinti HPLC-meghatározási módszerének felülvizsgálata = Review of the HPLC determination method for the vitamin A and E according to the standard
A zsĂrban oldĂłdĂł vitaminoknak zsĂros Ă©lelmiszermintában törtĂ©nĹ‘ meghatározásánál a fordĂtott fázisĂş HPLC meghatározáshoz szĂĽksĂ©g van az elszappanosĂtásos mĂłdszerekre, amennyiben zsĂrban oldĂłdĂł mintát kĂvánunk extrahálni. EzeknĂ©l a mĂłdszereknĂ©l azonban nincs egyĂ©rtelmű megállapodás a technolĂłgiai paramĂ©terekrĹ‘l mĂ©g a szabványokban sem. EzĂ©rt munkánk során a mĂłdszer visszanyerĂ©sĂ©t Ă©s gyorsaságát optimáltuk kĂ©tszintes kĂ©tfaktoros kĂsĂ©rleti terv szerint, ahol az elszappanosĂtási hĹ‘mĂ©rsĂ©kletnek Ă©s idĹ‘nek a mĂłdszer visszanyerĂ©sĂ©re gyakorolt hatását vizsgáltuk. MegállapĂtottuk, hogy a legmagasabb hĹ‘mĂ©rsĂ©kletű, lehetĹ‘ legrövidebb idejű elszappanosĂtás a leghatĂ©konyabb. VĂ©gĂĽl összehasonlĂtottuk a butilhidroxitoluol Ă©s aszkorbinsav antioxidáns által elĂ©rhetĹ‘ visszanyerĂ©st, aminek eredmĂ©nyekĂ©ppen az utĂłbbi antioxidánst Ă©rdemes alkalmazni. For determination of fat soluble vitamins in fatty foods by reversed phase HPLC, the sample can only be extracted by saponification. By these methods, there is not any compromise concerning the preparation’s parameters, e.g. temperature, time and antioxydant type. Thus in this experimentation we have optimized the yield by experimentation plan of two levels and two factors: temperature and time. We observed that the shortest time and highest temperature are the most efficient. Finally, we compared the yield by two different antioxydants, like butylated hydroxytoluene and ascorbic acid. These last gave significantly better yield, thus it is recommended to be used