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abcroll.bsky.social
Abcroll
@abcroll.bsky.social
150 followers 240 following 52 posts
Polymer Science on the Prairie
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abcroll.bsky.social
Autumn
A knee in blue jeans and a beer in a green bottle are seen in the foreground. A small fire burns in a fireplace. Beyond is a pile of wood on the edge of a fenced garden. On the fence hangs brown decaying vines. In the background you see some wood fences.
November 1, 2025 at 10:45 PM
abcroll.bsky.social
Action shot!
Photo of a chaotic garden. Foreground shows a rusty chicken wire fence, behind which are several colourful flowers. On the flowers, a vine spreads and behind everything is a wood fence. To the right of the image, tall sunflowers reach up. A monarch butterfly screeches past the flowers.
August 31, 2025 at 10:24 PM
abcroll.bsky.social
Hard to beat the north shore.
A rather cold wave breaks on a pebble shore, stirring up the red sand. View of multicoloured pebbles in foreground, with a wave breaking in the background. Sky is cloudy. A look down a pebbley beach, with waves crashing into the shore. A peninsula covered in confers juts out in the distance. Sky is filled with clouds.
August 18, 2025 at 6:52 PM
abcroll.bsky.social
A nice day on the bluffs.
A view through a boreal forest, across a bay to a small mountain known as the sleeping giant.
August 18, 2025 at 1:54 AM
abcroll.bsky.social
Once again, I am close but not close enough...
A tv in a French hotel shows riders in the the Tour de France.
July 12, 2025 at 2:41 PM
abcroll.bsky.social
ESMC2025 even has Green Day, why would you not come to Lyon?
Many people enjoy themselves around posters. A band plays a Green Day cover in the distance.
July 7, 2025 at 7:03 PM
abcroll.bsky.social
Some good storms rolled through last night! Hopefully the hail didn't murder my garden.
A lightening bolt forks as it crawls along the underside of a cloud, lighting the silhouette of a tree.
June 21, 2025 at 1:59 PM
abcroll.bsky.social
I got a new toy for the lab, and it is fuuuuun!
A hand holding a futuristic tool resembling a 1980's car phone in the foreground. The device shines a grid of blue lasers onto a paper sheet. Behind a computer screen shows the shape of the sheet.
June 20, 2025 at 6:48 PM
abcroll.bsky.social
Not a bad day for an ONR review.
A view across a small bay. Foreground is a boarder of black volcanic rock. In the distance, waves speckled with surfers and small breakers. To the right a bit of rocky shore and a rainbow.
June 12, 2025 at 4:50 PM
abcroll.bsky.social
Another two fine Ph.D's on the market!
Mila Kryjevskaia in purple robes stands next to Safana Ismael, who is in NDSU green black and gold robes. Kurt Vandonselaar is next, also in NDSU robes. Finally Andrew Croll stands to the right in maroon and white robes. All wear silly hats. Background shows an exciting white brick basement wall.
May 17, 2025 at 11:39 PM
abcroll.bsky.social
A nice day in northern MN.
A forest view in northern Minnesota. Foreground shows some trembling aspen saplings, behind which stand some pines. Sky is blue and dappled with clouds. A sandy road peeks in the bottom right corner.
May 10, 2025 at 4:29 PM
abcroll.bsky.social
It's cool that #FedEx is now doing crumpling experiments too! I hope there is a chance for more substantial collabouration in the future!
A white FedEx shining box with a nice read warning label stating "Delicate Instruments, Handle with great care" shows substantial crushing has taken place during shipping. There is a macroscopic stress focus and acordian like failure along the edge of the box.
March 24, 2025 at 3:30 PM
abcroll.bsky.social
End of another APS March meeting. Lots of good science, but I'm not fond of the new megameeting format.
Three APS members smiling in a photo. The sun is shining and the background shows a small waterfountain yellow/brown rocks and several leafy trees.
March 21, 2025 at 9:10 PM
abcroll.bsky.social
Come down to Anaheim for squishy science Sunday!!!
Two children marvel at some granular physics! Some red beads between two clear acrylic sheets show jamming as a scientist slowly opens a gap below the beads. It is somewhat like a two dimensional hourglass. Other scientists look on and many other demos sit on tables.
March 16, 2025 at 7:14 PM
abcroll.bsky.social
We are ready to squishy some science in Anaheim.
A view of the California C ballroom in the Anaheim Hilton. Tables with poster boards and tvs stand behind them. Several scientists are setting up demos. Leo-Stanley and Kurt are busy setting up an adhesion demo on some tables draped with long black tablecloths.
March 16, 2025 at 5:05 PM
abcroll.bsky.social
Good advice. Say, for when you are holding bags of groceries and can't reach the light switch...
An elbow is up, flipping a light switch on.
March 6, 2025 at 4:19 PM
abcroll.bsky.social
Describe your account in one Simpsons image
Abe Simpson pointing while squinting. Text overlaying the image says"I used to be with it but then they changed what it was. Now what I'm with isn't it and what's it seems weird and scary to me... it'll happen to you too"
March 1, 2025 at 9:33 PM
abcroll.bsky.social
Adhesion society annual meeting begins this afternoon. For now, some coffee at Fourth Wall. Nice place if you are in New Orleans
Pain au Chocolat on a plate beside an espresso cup. Both rest on a café table. Background shows wooden barstools and a worn but attractive red patterned rug. My foot in a brown shoe dangles beside table
February 16, 2025 at 2:18 PM
abcroll.bsky.social
-23C with wind putting it at -35C or so. So I went for a snowshoe as one on the prairie does.
A first person view, looking down at feet in newer, but traditional style snowshoes. Grass peaks through the snow. A view of a boy with hiking poles and snowshoes nearing a pickup. The background shows a setting sun obscured by some low, ice crystal clouds.
January 19, 2025 at 11:54 PM
abcroll.bsky.social
Awesome sun dogs this afternoon in South Dakota, and lovely moon dogs this evening in North Dakota!
A photo of the snowy South Dakota prarie. Center shows the sun near the horizon with two rainbow-like sun dogs on either side. Turbines turn in the distance, while light polls in the right foreground slowly disappear into the distance. A photo of the night sky. Center bottom shows the moon distorted by ice crystals in the air. A curved line links the moon to rainbow-like moon dogs on either side. A few stars show in the night sky above the moon.
January 13, 2025 at 4:52 AM
abcroll.bsky.social
Ooooh, happy holidays to me!
A plywood box sits on a trolly, with a screwdriver on top. The address of my laboratory is written in red below the phrase "ok to stack".
December 30, 2024 at 4:01 PM
abcroll.bsky.social
Wathsala Jayawardana, first place in the 2021 Society for Engineering Science photo contest.
A bubble sits, glistening in the sun on some snow. Several ice crystals can be seen forming in the bubble.
December 24, 2024 at 3:22 PM
abcroll.bsky.social
What a wonderful frost this morning!
Tightly packed dendrites of ice are shown on a branch of a black hills spruce in the foreground. Background shows out of focus snow. Frost dendrites on a chicken wire fence. The foreground focuses on a single hexagon covered in thick, white dendrites. Background shows more of the fence covered in frost. Though contrast isn't great, you can see the fractal-like profile of the frost on the foreground image. A red Christmas light covered in frost from one side, showing a nice view of the icy dendrites. Background shows an out of focus ice rink. A former grassy plant covered in frost, such that it seems the weight is causing it to bend. Background shows the brown vertical risers of a deck railing.
December 24, 2024 at 2:55 PM
abcroll.bsky.social
Another, another crushed thingamagiggy. An unrelated comment: I didn't finish marking papers today.
A crumpled, transparent sheet lies between two gleaming stainless steel plates in a universal test frame.
December 19, 2024 at 9:49 PM
abcroll.bsky.social
Day 2 of exam week, what a great time to run a woodchipper beside the Library...
A view through a second story window of a truck and woodchipper beside the NDSU library. Several workers are wondering around looking for branches below several tall, leafless oak trees. A few bright orange pilons indicate the work for any students with hearing difficulties.
December 17, 2024 at 4:58 PM