🌈 Social 📸 Photography 🌈

Nicole SharpAnti-Icing Polar Bear FurDespite spending their lives in and around frigid water, snow, and ice, polar bears are rarely troubled by ice building up on their fur. This natural anti-icing property is one Inuits have long taken advantage of by using polar bear fur in hunting stools and sandals. In a <a href="https://doi.org/10.1126/sciadv.ads7321" rel="nofollow noopener" target="_blank">new study</a>, researchers looked at just how “icephobic” polar bear fur is and what properties make it so.The key to a polar bear’s anti-icing is sebum — a mixture of cholesterol, diacylglycerols, and fatty acids secreted from glands near each hair’s root. When sebum is present on the hair, the researchers found it takes very little force to remove ice; in contrast, fur that had been washed with a surfactant that stripped away the sebum clung to ice.The researchers are interested in uncovering which specific chemical components of sebum impart its icephobicity. That information could enable a new generation of anti-icing treatments for aircraft and other human-made technologies; right now, many anti-icing treatments use <a href="https://en.wikipedia.org/wiki/Per-_and_polyfluoroalkyl_substances" rel="nofollow noopener" target="_blank">PFAS</a>, also known as “forever chemicals,” that have major disadvantages to human and environmental health. (Image credit: <a href="https://unsplash.com/photos/polar-bear-on-water-during-daytime-KgRKlQXmHR0" rel="nofollow noopener" target="_blank">H. Mager</a>; research credit: <a href="https://doi.org/10.1126/sciadv.ads7321" rel="nofollow noopener" target="_blank">J. Carolan et al.</a>; via <a href="https://physicsworld.com/a/scientists-discover-secret-of-ice-free-polar-bear-fur/?__readwiseLocation=" rel="nofollow noopener" target="_blank">Physics World</a>)<a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/adhesion/" target="_blank">#adhesion</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/biology/" target="_blank">#biology</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/chemistry/" target="_blank">#chemistry</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/fluid-dynamics/" target="_blank">#fluidDynamics</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/icing/" target="_blank">#icing</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/physics/" target="_blank">#physics</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/polar-bears/" target="_blank">#polarBears</a> <a rel="nofollow noopener" class="hashtag u-tag u-category" href="https://fyfluiddynamics.com/tagged/science/" target="_blank">#science</a>

AndréFrosted! <a href="https://pixelfed.social/discover/tags/frosted?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#frosted</a> <a href="https://pixelfed.social/discover/tags/iced?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#iced</a> <a href="https://pixelfed.social/discover/tags/trees?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#trees</a> <a href="https://pixelfed.social/discover/tags/tree?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#tree</a> <a href="https://pixelfed.social/discover/tags/winter?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#winter</a> <a href="https://pixelfed.social/discover/tags/snow?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#snow</a> <a href="https://pixelfed.social/discover/tags/winterlylandscape?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#winterlylandscape</a> <a href="https://pixelfed.social/discover/tags/winterphotography?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#winterphotography</a> <a href="https://pixelfed.social/discover/tags/white?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#white</a> <a href="https://pixelfed.social/discover/tags/landscapephotography?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#landscapephotography</a> <a href="https://pixelfed.social/discover/tags/nature?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#nature</a> <a href="https://pixelfed.social/discover/tags/naturephotography?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#naturephotography</a> <a href="https://pixelfed.social/discover/tags/iamtheoriginal?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#iamtheoriginal</a> <a href="https://pixelfed.social/discover/tags/iamoriginal?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#iamoriginal</a> <a href="https://pixelfed.social/discover/tags/outdoors?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#outdoors</a> <a href="https://pixelfed.social/discover/tags/winterhike?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#winterhike</a> <a href="https://pixelfed.social/discover/tags/cold?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#cold</a> <a href="https://pixelfed.social/discover/tags/frozen?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#frozen</a> <a href="https://pixelfed.social/discover/tags/frosting?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#frosting</a> <a href="https://pixelfed.social/discover/tags/icing?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#icing</a>

C.From the timings of those back-EMF spikes, the <a href="https://mindly.social/tags/embedded" class="mention hashtag" rel="nofollow noopener" target="_blank">#embedded</a> <a href="https://mindly.social/tags/CPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#CPU</a> can determine how fast the motor is turning. But even trickier is that by sensing the shape or magnitude of that back-EMF signal, it can determine how much <a href="https://mindly.social/tags/torque" class="mention hashtag" rel="nofollow noopener" target="_blank">#torque</a> the motor is producing - and therefore how much air is actually moving.This is useful; in an A/C setup, you want to know if air is actually moving past the <a href="https://mindly.social/tags/evaporator" class="mention hashtag" rel="nofollow noopener" target="_blank">#evaporator</a> <a href="https://mindly.social/tags/coil" class="mention hashtag" rel="nofollow noopener" target="_blank">#coil</a>, not just how fast the motor is turning, so you can detect the coil "<a href="https://mindly.social/tags/icing" class="mention hashtag" rel="nofollow noopener" target="_blank">#icing</a> up".14/x

eclectechCake and scribbles

Ruth MottramFirst <a href="https://pixelfed.eu/discover/tags/Fastelavnsboller?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Fastelavnsboller</a> of the year (+ first home made ever). I now completely get what the fuss is about, there's no substitute for fresh from the oven. They did not last long. A light fluffy <a href="https://pixelfed.eu/discover/tags/vanilla?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#vanilla</a> + <a href="https://pixelfed.eu/discover/tags/cardamom?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#cardamom</a> wheat bun filled with vanilla cream + <a href="https://pixelfed.eu/discover/tags/marzipan?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#marzipan</a> <a href="https://pixelfed.eu/discover/tags/remonce?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#remonce</a>. Folding + decorating with simple icing + different toppings was fun for the family. Traditionally eaten in <a href="https://pixelfed.eu/discover/tags/Denmark?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Denmark</a> before <a href="https://pixelfed.eu/discover/tags/Lent?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Lent</a> <a href="https://pixelfed.eu/discover/tags/vegan?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#vegan</a> <a href="https://pixelfed.eu/discover/tags/recipe?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#recipe</a> from <a href="https://pixelfed.eu/discover/tags/AlberteStengaard?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#AlberteStengaard</a> <a href="https://pixelfed.eu/discover/tags/FamilyActivities?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#FamilyActivities</a> <a href="https://pixelfed.eu/discover/tags/Fastelavn?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Fastelavn</a> <a href="https://pixelfed.eu/discover/tags/Lent?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Lent</a> <a href="https://pixelfed.eu/discover/tags/vanilla?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#vanilla</a> <a href="https://pixelfed.eu/discover/tags/icing?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#icing</a>

@Om*pink icing donut…<a href="https://mastodon.cloud/tags/pink" class="mention hashtag" rel="nofollow noopener" target="_blank">#pink</a> <a href="https://mastodon.cloud/tags/icing" class="mention hashtag" rel="nofollow noopener" target="_blank">#icing</a> <a href="https://mastodon.cloud/tags/donut" class="mention hashtag" rel="nofollow noopener" target="_blank">#donut</a> <a href="https://mastodon.cloud/tags/eyeball" class="mention hashtag" rel="nofollow noopener" target="_blank">#eyeball</a> <a href="https://mastodon.cloud/tags/animatedgif" class="mention hashtag" rel="nofollow noopener" target="_blank">#animatedgif</a>

@Om*finishing touches...<a href="https://mastodon.cloud/tags/lefthand" class="mention hashtag" rel="nofollow noopener" target="_blank">#lefthand</a> <a href="https://mastodon.cloud/tags/string" class="mention hashtag" rel="nofollow noopener" target="_blank">#string</a> <a href="https://mastodon.cloud/tags/finishing" class="mention hashtag" rel="nofollow noopener" target="_blank">#finishing</a> <a href="https://mastodon.cloud/tags/touches" class="mention hashtag" rel="nofollow noopener" target="_blank">#touches</a> <a href="https://mastodon.cloud/tags/cake" class="mention hashtag" rel="nofollow noopener" target="_blank">#cake</a> <a href="https://mastodon.cloud/tags/icing" class="mention hashtag" rel="nofollow noopener" target="_blank">#icing</a> <a href="https://mastodon.cloud/tags/flower" class="mention hashtag" rel="nofollow noopener" target="_blank">#flower</a> <a href="https://mastodon.cloud/tags/foodart" class="mention hashtag" rel="nofollow noopener" target="_blank">#foodart</a> <a href="https://mastodon.cloud/tags/animatedgif" class="mention hashtag" rel="nofollow noopener" target="_blank">#animatedgif</a>

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