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@andres4ny@social.ridetrans.it
2026-06-17 03:27:17

Added Power Grips (pedal straps) to my wife's #Brompton. Not going to say it's my nicest work, but I'm hopeful that it'll hold. I only drilled holes through the plastic reflectors; the metal is all intact. I can change that later if needed. #BikeTooter

The right side pedal. The red Brompton is folded up (doesn't even really look like a bike), but the right crank has a normal-looking pedal with a black strap on it. The metal hardware attachment has screws going through the orange plastic reflector of the pedal. The bike's on a white rug w/ black line pattern.
The opposite side of that same right pedal. You have a better view of the opposite side of the orange reflector, with nuts and washers attached to the bolts that go through it. The red folding bike it's attached to is just a jumble of stem, wheel, drivetrain, etc.
The left-side pedal (and behind it, the brompton logo on the red frame). The pedal is folded up so that it is parallel to the crank arm. The orange reflector is missing from the exposed side of the pedal. Of the two screws that held the reflector in, one is missing (just an empty screw hole), and the other is screwed into the end of the black Power Grip strap.
The other side of the left pedal. This time the pedal is unfolded (so it's perpendicular to the crank arm), and the plastic grey reflector mount is installed but only one side is screwed in. The orange reflector is actually missing, and underneath you can see the silver Power Grips attachment hardware. Though normally you'd have two screws holding the attachment hardware in, there's only one screw there; the grey reflector mount is on top of it, pinching it down to hold it in place. Essentially…
@arXiv_physicsmedph_bot@mastoxiv.page
2026-07-21 08:05:14

Imaging of ultrasound specularity at cortical bone interfaces to detect unbalanced remodeling: A preliminary study
Amadou S. Dia, Salom\'e Vignat, Guillaume Renaud, Quentin Grimal
arxiv.org/abs/2607.16791 arxiv.org/pdf/2607.16791 arxiv.org/html/2607.16791
arXiv:2607.16791v1 Announce Type: new
Abstract: The region near the interface between cortical bone and the medullary cavity (the endosteal surface) is of particular interest for the early detection of osteoporosis. This region is typically the first to exhibit signs of unbalanced remodeling (enlarged pores and increased surface roughness). In this study, we analyze ultrasound reflection at the endosteal surface to introduce a novel potential biomarker of cortical bone health based on specularity. Our hypothesis is that increased pore size and surface roughness enhance ultrasound scattering, thereby reducing specular reflection. We reconstruct maps of specularity by combining a signal processing technique initially designed to enhance specular reflectors in soft tissues with a beamforming technique that accounts for refraction at bone soft tissue interfaces. Specularity values (between 0 and 1) quantify the similarity between received signals and signals from an ideal specular reflector. Using numerical simulations and ex vivo measurements with a 2.5 MHz phased array we highlight a strong relationship between specularity and bone microstructure, as assessed by high-resolution micro-computed tomography. Among 12 regions of interest (ROI) in the femoral bone of three donors, 8 ROIs without large pores showed high specularity (>0.5) in over 50% of pixels, in contrast to 4 ROIs with signs of extensive remodeling. Both pore volume fraction and pore size were strongly associated with specularity. In simple linear regression analyses, each parameter individually explained 84% of the variability in specularity. These findings suggest that specularity reflects bone microstructure and may potentially serve as a sensitive marker for identifying cortical bone degradation near the endosteal surface.
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