International Polar Bear Agreement

The Stream Cipher Polar Bear

We propose a new stream cipher called “Polar Bear”. It combines constructions used successfully in other situations. The key initialization uses Rijndael, the steady state uses a dynamic table as in RC4 and we guarantee a long period through the use of a linear feedback shiftregister. The efficiency for short messages is better than that of RC4 while for long messages Polar Bear is about a fact...

The Polar Bear — Ursus maritimus

Is polar bear hair fiber optic?

New direct measurement of high optical attenuation rates in polar bear hairs--2-8 dB/mm in the visible--and reanalysis of the data of Tributsch et al. [Sol. Energy Mater. 21, 219 (1990)] seem to rule out the UV waveguiding proposed by Grojean et al. [Appl. Opt. 19, 339 (1980)]. The case against fiber-optic polar bear hairs is summarized, and four conditions are given that any variation of the m...

International Workshop on Interfaces at Bear Creek

The International Polar Year.

C hange is ubiquitous in Earth's history, and evidence is clear that Earth's climate is changing rapidly now. The harbingers of change can be seen vividly in the polar regions. The Arctic ice cover is melting, ice shelves in Antarctica are crumbling, glaciers in temperate regions are disappearing, some ecosystems are changing, and permafrost thawing is causing the collapse of roads, buildings, ...