@hikingdude@mastodon.social2026-07-20 17:50:12
#mountainMonday ! Unfortunately not a recent photo but one that's quite a while ago. Before my wife had 2 knee issues. But maybe we can go there again soon.
As you can see, the landscape there is A BLAST! I totally love the area
#mountains
@cdarwin@c.im2026-07-21 03:54:42
National parks are deteriorating. There’s a fix Congress isn’t making.
The national park system faces a maintenance backlog of $24 billion in crumbling roads, aging water systems, washed-out trails and dilapidated visitor facilities.
That is more than seven times the National Park Service’s annual budget.
Last month, committees in both the House and Senate advanced bipartisan bills to dedicate roughly $1.3 billion annually for park maintenance over the next five years. …
@djghettoredneck@mastodon.djghettoredneck.com2026-09-21 03:32:52
I'm watching JoJo's Bizarre Adventure 4x25 "Spicy Lady" #JoJosBizarreAdventure
@djghettoredneck@mastodon.djghettoredneck.com2026-09-21 04:43:21
I'm watching JoJo's Bizarre Adventure 4x28 "Beneath a Sky on the Verge of Falling" https://trakt.tv/shows/jojo-s-bizarre-adventure/seasons/4/episodes/28
@arXiv_physicsmedph_bot@mastoxiv.page2026-07-21 07:55:04
Theoretical derivation of blood velocity from TOF-MRA based artery centerline
Abrar Faiyaz
https://arxiv.org/abs/2607.16498 https://arxiv.org/pdf/2607.16498 https://arxiv.org/html/2607.16498
arXiv:2607.16498v1 Announce Type: new
Abstract: Time-of-flight magnetic resonance angiography (TOF-MRA) is widely used for structural vascular imaging, but extracting functional hemodynamics like blood velocity typically requires supplementary phase-contrast scans. This study proposes a novel, physics-informed computational framework to extract variable fluid velocity directly from standard TOF-MRA signal profiles. We analytically expand the Bloch equations into Bloch-McConnell flow equations, establishing a mathematical relationship between the spatial decay of longitudinal magnetization and fluid velocity. To validate this derivation and overcome the limitations of constant-velocity assumptions, a MATLAB simulation framework was developed to model fluid flow in two variable-geometry flowing tube cases i.e continuous tapering and focal stenosis -under synthetic scanner noise. A global inverse optimization approach utilizing Dual-Tikhonov regularization was deployed to stably invert the ill-posed transit time integral, actively penalizing high-frequency numerical ringing while preserving structural curve stiffness. The computational sim-ulations successfully recovered ground-truth point-wise velocities, accurately tracking gradual hemodynamic accelerations and sharp stenotic jets. This theoretical framework provides a robust mathematical proof-of-concept that quantitative, localized functional hemodynamic metrics can be extracted from standard structural MRA imaging, estab-lishing a foundation for advanced flow quantification without requiring additional scan time.
toXiv_bot_toot
@samvarma@fosstodon.org2026-08-20 02:42:33
@hikingdude@mastodon.social2026-07-14 19:37:02
Just another place we visited in the Fränkische Schweiz. We just walked along a little stream and suddenly passed through this rock-gate with all the lush green on either side.
Just beautiful.
https://www.franzgraf.de/blog/2026/caves-and-meadows-d…
@djghettoredneck@mastodon.djghettoredneck.com2026-09-16 08:00:24
I'm watching JoJo's Bizarre Adventure 4x25 "Spicy Lady" #JoJosBizarreAdventure
@hikingdude@mastodon.social2026-08-09 11:42:19
I couldn't decide what to do today and where to go. I got up too late for a longer hike due to the heat. In the end I just got on my bike and followed the road and pushed myself for some training effect.
It was a really enjoyable ride except for the last 10km where the heat got really annoying.
Is this a #silentsunday contribution? I think so... No talking, less thinking, j…
