Per Edström at Mid Sweden University has attracted international attention for his research, which has resulted in a new generation of computational tools for simulation of light in paper and print.
Whiteness is a fundamental property of paper. But what is whiteness exactly, how does it arise, and how do you measure whiteness? How difficult can it really be to produce good color prints?
Per Edström pursues research on mathematical modeling and scientific computing. His model is replacing an old model that has been used by the paper and printing industries since the 1930s.
"Light that hits paper penetrates a bit. Some of it is absorbed and disappears, while some scatters in other directions," says Per Edström. "This is affected by fibers and fillers in the paper, and by various additives and ink. This is a rather complex process that gives paper its visual appearence. Tiny constituents in the paper provide the light with many surfaces to scatter against, and this helps create a lighter paper. Ink, on the other hand, absorbs light of different wavelengths, producing color. The total impression is also dependent on how all of the components in the paper are distributed, for example, how the ink penetrates into the paper. Finally, the color experience depends on how the eye and the brain interpret the visual impression, all of which means that it is not so simple to understand these phenomena in detail."
Per Edström has delved deeply into numerical solution methods for systems of coupled integro-differential equations. There are many applications for this, one of which is to describe how light interacts with paper and print to produce a visual experience.
"I like to challenge my students with a little contest at the end of a lecture on whiteness," says Per Edström. "They have fifteen minutes, and the student who submits the whitest paper will win a prize. Even though I have had many enthusiastic students, I have yet to award a prize. Contact me if you want to know why. And how white is a piece of paper anyway?"
Questions can be submitted to:Per Edström, phone: +46 (0)611-862 44 or cell phone: +46 (0)73-760 21 51.
Lars Aronsson | idw
A better way to weigh millions of solitary stars
15.12.2017 | Vanderbilt University
A chip for environmental and health monitoring
15.12.2017 | Friedrich-Alexander-Universität Erlangen-Nürnberg
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences