Mastodawn

Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
--
https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
--
#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics

Unofficial PetaPixel Bot Apr 29

Camera-Equipped Nurse Shark Captures Rare Footage of Great White https://petapixel.com/2025/04/29/camera-equipped-nurse-shark-captures-rare-footage-of-great-white/ #floridaatlanticuniversity #genevievesylvester #greatwhiteshark #videographer #Technology #kinematics #nurseshark #drkajiura #shark #News #film #fau

Camera-Equipped Nurse Shark Captures Rare Footage of Great White

Likely the first time a shark has ever captured images of another shark.

PetaPixel

💧🌏 Greg Cocks Mar 31

Kinematic Evolution Of A Large Paraglacial Landslide In The Barry Arm Fjord Of Alaska
--
https://doi.org/10.1029/2023JF007119 <-- shared paper
--
https://doi.org/10.5066/P9EUCGJQ <-- shared technical article
--
https://www.sciencebase.gov/catalogMaps/mapping/ows/5fff561ed34e592d8671ee85?service=wms&request=getcapabilities&version=1.3.0 <-- shared web mapping service
--
#GIS #spatial #mapping #massmovement #landslide #engineeringgeology #remotesensing #sitespecific #LiDAR #iFSAR #paraglacial #kinematics #mapping #monitoring #spatialanalysis #spatiotemporal #fedscience #risk #hazard #glacier #retreat #climatechange #Alaska #BarryArm #fjord #hazardassessment #tsunami #wave #BarryGlacier #change #sensors #fieldwork #surveillance #melting #permafrost #Whittier #geophysics #geology #Alaska #geomorphometry #deglaciating
@USGS

Show thread

UAFunMorph Mar 21

This suggests beak adaptations for strength don’t necessarily reduce efficiency on easier foods. 🐤 Read the full study by PhD student Tim Andries here: https://doi.org/10.1242/jeb.249681
#canaries #kinematics #morphology @J_Exp_Biol (3/3)

wicket wolf Nov 12, 2024

Overarm Throwing - Effect of Specific Strength Training on Velocity [html/pdf 11pp] #cricket #sports #throwing #kinematics https://sportsmedicine-open.springeropen.com/articles/10.1186/s40798-024-00785-7

The Effect of Specific Strength Training on Throwing Velocity in Overarm Throwing: A Systematic Review - Sports Medicine - Open

Background Throwing velocity is an important research topic in sports science, and it is an essential performance variable for athletes in overarm-throwing sports like baseball, team handball, water polo, softball, and cricket. The aim of the present review was to investigate the effect of specific strength training on throwing velocity for overarm throws. Methods The literature was analysed using the Preferred Reporting Items for Systematic reviews and Meta-analyses, searching in SPORTDiscus and MEDLINE. Seventeen studies were included in this review, and the training studies were divided into four categories: (a) overweight and underweight balls, (b) forearm loading, (c) pulley device training, and (d) strength training with a resistance band. Results All strength training studies with resistance band and the forearm loading categories increased the throwing velocity, varying from 3.7 to 26%. However, only half of these studies found that training was associated with a significantly higher increase versus the control group. Findings were inconsistent in other categories. Conclusion Based on the findings of the present review, no clear conclusion can be made on which of the specific strength training methods is best for increasing throwing velocity. However, some recommendations can be offered. Firstly, the throwing training period should be long enough (≥ 6 weeks) with a high enough workload. Throwing training with a resistance band increases throwing velocity significantly for junior and less experienced overarm-throwing athletes. Furthermore, throwing with underweighted balls of similar size will ensure a positive effect on throwing velocity. Also, throwing training with combined over- and underweighted balls can be used if the overweighted balls are carefully selected to ensure there is no negative impact on throwing kinematics and injuries. For the other categories, the results were conflicting. Furthermore, due to the low number of studies in the pulley device and forearm loading categories, more studies should be conducted to investigate their effects on throwing velocity.

SpringerOpen

Show thread

Dagmar Fraser Sep 16, 2024

In our recent preprint (introduced here https://mstdn.science/@dagmarfraser/113108130352424451) we show advantages of Savitzky-Golay differentiator filter in velocity-curvature power law calculations (possibly applicable in #kinematics in general). SG de-noises & gives arbitrary derivative, avoiding compounding error of BW filtering & repeated diff'ing.

We provide open-source code in #MATLAB https://github.com/dagmarfraser/velocity-curvature-power-law-protocol with BW filters and SG side by side, for easy drop in comparison and implementation.

Dagmar Fraser Sep 16, 2024

Pre-processing human #kinematics with zerolag 2nd order lowpass ButterWorth filters is almost an article of faith. Winter et al. (1974) introduced this filter strategy for motion tracking gait @ 60Hz × 96 × 96 pixels!

The BW filter allows simple, successive differentiation of noisy x & y to give ‘denoised’ velocity, acceleration & jerk.

Yet one-size-fits-all might need updating after 50 years; for higher sampling rates, more pixels, and novel tasks?

Show thread

Dagmar Fraser Sep 9, 2024

Each step in the power law calculation– filtering, differentiation & regression –can potentially bias towards 1/3. We distil a toolkit, building on key insights from the literature, & demonstrate it does not fall foul of this. https://github.com/dagmarfraser/velocity-curvature-power-law-protocol

The code & discussions are relevant to all #kinematics research using zero lag 10Hz low pass Butterworth filters, using finite differences differentiation (velocity to acceleration to jerk), or does linear regression after a log projection. 3/8

GitHub - dagmarfraser/velocity-curvature-power-law-protocol

Contribute to dagmarfraser/velocity-curvature-power-law-protocol development by creating an account on GitHub.

GitHub

Deadline Sep 3, 2024

‘The Apprentice’ Backer Kinematics Confirms Exit From Project, Cites “Creative Differences”
#News #2024election #DonaldTrump #ElectionLine #Kinematics #TheApprentice

https://deadline.com/2024/09/the-apprentice-financier-kinematics-confirms-exit-creative-differences-1236076609/