Peter-Jon Rudquist

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Antiferroelectric liquid crystal materials are very promising for high-resolution displays but so far suffer from two serious problems, both of which reduce the achievable contrast. These materials are first of all very hard to align to a high quality dark state. Most often this has been attributed to the fact that antiferroelectric materials lack a nematic(More)
Despite more than ten years of R&D in antiferroelectric liquid crystal displays (AFLCDs), this very promising technology has not yet reached the market. The main reason for this is the bad dark state due to light leakage from imperfections of the LC alignment and from the pretransitional effect. We have found that both problems are eliminated by using AFLC(More)
Photon upconversion has the potential to increase the efficiency of single bandgap solar cells beyond the Shockley Queisser limit. Efficient light management is an important point in this context. Here we demonstrate that the direction of upconverted emission can be controlled in a reversible way, by embedding anthracene derivatives together with palladium(More)
This study investigated tree root biology curricula at 89 two-year post-secondary arboriculture, urban forestry, and related-disciplinary degree programs in the United States. An eighteen question survey was used to learn about arboriculture and urban forestry academic programs, tree biology courses, and the importance of forty-six topics from tree biology(More)
Antiferroelectric liquid crystals (AFLCs) have a great potential for high resolution displays for computers and video. We have earlier shown [1-3] that the contrast of transmissive mode AFLC displays is optimized by using materials with a molecular tilt angle of essentially 45°, i.e. orthoconic materials. In this paper we show that such materials also open(More)
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