A large number of optical properties in paper and print are determined by measuring the light reflected from an illuminated paper surface. These measurements are interpreted through a model, and the one that has been in use in the paper industry since the 1930s is deficient in some respects.
“We discovered that this is because the light is reflected in different amounts in different directions in an unexpected way. Our new model can explain and cope with this,” says researcher Per Edström.
What made this new discovery possible is his research into numerical methods for effectively solving a class of integro-differential equations. This is a type of problem that has applications in such diverse spheres as the greenhouse effect, medical tomography, and light diffusion in diffuse media.
“The methods Per Edström has developed are not only original. They have also been shown to be robust, accurate, and extremely effective,” says Professor Mårten Gulliksson.
Developmental work has involved collaboration with several companies in the paper industry. There has been a great interest since increased knowledge in this field means greater competitiveness.
“We have already started to use the new model,” says Nils Pauler at M-Real’s Research Center in Örnsköldsvik in Sweden. “We hope it will help us understand different variations in the visual impression made by paper and print.”
“It should be pointed out that Per Edström’s dissertation involves a tremendously broad spectrum of subject areas. From an advanced formulation of the physical problem in mathematical form, which is extremely well rooted in applications, he develops a stable and effective software that can be directly put to use by the industry with great success. This is an impressive achievement that is seldom witnessed in the field of mathematics.”
These are the concluding remarks of Professor Mårten Gulliksson.
The dissertation is titled ”Mathematical Modeling and Numerical Tools for Simulation and Design of Light Scattering in Paper and Print.”
Lars Aronsson | alfa
New manufacturing process for SiC power devices opens market to more competition
14.09.2017 | North Carolina State University
Quick, Precise, but not Cold
17.05.2017 | Fraunhofer-Institut für Lasertechnik ILT
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
20.10.2017 | Information Technology
20.10.2017 | Materials Sciences
20.10.2017 | Interdisciplinary Research