#kinematics — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #kinematics, aggregated by home.social.
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Alright, future engineers!
**Kinematics:** Describes motion through displacement, velocity, & acceleration.
Ex: `v = v0 + at` (constant accel).
Pro-Tip: Choose the right equation by matching your knowns/unknowns! -
Alright, future engineers!
**Kinematics:** Describes motion through displacement, velocity, & acceleration.
Ex: `v = v0 + at` (constant accel).
Pro-Tip: Choose the right equation by matching your knowns/unknowns! -
@ombialik Bruno Grossi et al. (2014) provide interesting evidence suggesting that #shifting the #centerofmass using an artificial #tail causes #birds to exhibit movements reminiscent of non-avian #theropods (#dinosaurs).
© this text Stefan F. Wirth
Reference: https://doi.org/10.1371/journal.pone.0088458
Fig.
Influence of the additional mass and the experimental tail on #limbposture and #kinematics. Authors: see above; licensed under http://creativecommons.org/licenses/by/4.0/ -
@ombialik Bruno Grossi et al. (2014) provide interesting evidence suggesting that #shifting the #centerofmass using an artificial #tail causes #birds to exhibit movements reminiscent of non-avian #theropods (#dinosaurs).
© this text Stefan F. Wirth
Reference: https://doi.org/10.1371/journal.pone.0088458
Fig.
Influence of the additional mass and the experimental tail on #limbposture and #kinematics. Authors: see above; licensed under http://creativecommons.org/licenses/by/4.0/ -
In the past years our team at #HUBerlin and #ChariteBerlin was able to recruit 451 adults (231 females) aged 18-64 years, with and without low-back pain.
Besides #kinematics, we assessed muscle strength, activation (#EMG) and morphology (#MRI) of the trunk.
Today we finally submitted our second manuscript and it is my pleasure to publicly share this unique dataset and the #rstats code used for analyses (https://doi.org/10.5281/zenodo.17950007).
We sincerely hope that our commitment to #OpenScience and #FairData allows researchers worldwide to use this data and foster global research initiatives, collaborations and comparative studies on low-back pain, facilitating cross-cohort validation and a broader applicability of findings.
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In the past years our team at #HUBerlin and #ChariteBerlin was able to recruit 451 adults (231 females) aged 18-64 years, with and without low-back pain.
Besides #kinematics, we assessed muscle strength, activation (#EMG) and morphology (#MRI) of the trunk.
Today we finally submitted our second manuscript and it is my pleasure to publicly share this unique dataset and the #rstats code used for analyses (https://doi.org/10.5281/zenodo.17950007).
We sincerely hope that our commitment to #OpenScience and #FairData allows researchers worldwide to use this data and foster global research initiatives, collaborations and comparative studies on low-back pain, facilitating cross-cohort validation and a broader applicability of findings.
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Thank you everyone for the warm welcome.
I am looking foward to exchange and get inspired by your work.Since some of you wanted to know more about my research:
feel free to have a look at my last publication on movement coordination in people with low-back pain (https://doi.org/10.3389/fspor.2025.1524489). We measured #kinematics in 306 adults and made the whole data set and code publicly available (https://doi.org/10.5281/zenodo.14050785).#OpenScience, #FAIRData, #rstats, #movementscience, #biomechanics
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Thank you everyone for the warm welcome.
I am looking foward to exchange and get inspired by your work.Since some of you wanted to know more about my research:
feel free to have a look at my last publication on movement coordination in people with low-back pain (https://doi.org/10.3389/fspor.2025.1524489). We measured #kinematics in 306 adults and made the whole data set and code publicly available (https://doi.org/10.5281/zenodo.14050785).#OpenScience, #FAIRData, #rstats, #movementscience, #biomechanics
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Improved 3D Printer Cannibalizes Two Older Printers https://hackaday.com/2025/09/30/improved-3d-printer-cannibalizes-two-older-printers/ #3dPrinterhacks #kinematics #3dprinter #duender #CoreXY #ender3
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Improved 3D Printer Cannibalizes Two Older Printers https://hackaday.com/2025/09/30/improved-3d-printer-cannibalizes-two-older-printers/ #3dPrinterhacks #kinematics #3dprinter #duender #CoreXY #ender3
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Improved 3D Printer Cannibalizes Two Older Printers - In the late 2010s, the Ender 3 printers were arguably the most popular line of 3D ... - https://hackaday.com/2025/09/30/improved-3d-printer-cannibalizes-two-older-printers/ #3dprinterhacks #kinematics #3dprinter #duender #corexy #ender3
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Improved 3D Printer Cannibalizes Two Older Printers - In the late 2010s, the Ender 3 printers were arguably the most popular line of 3D ... - https://hackaday.com/2025/09/30/improved-3d-printer-cannibalizes-two-older-printers/ #3dprinterhacks #kinematics #3dprinter #duender #corexy #ender3
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Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics -
Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics -
Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics -
Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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https://doi.org/10.1038/s41561-025-01704-5 <-- shared paper
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#geology #structuralgeology #japan #subduction #system #plate #geometry #mantle #tectonics #geodynamics #orogeny #Ryukyu #IzuBoninMarianas #kinematics #backarc #earthquake #fault #faulting #orogenesis #platetectonics -
Non-Collisional Orogeny In Northeast Japan Driven By Nearby Same-Dip Double Subduction
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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 -
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
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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
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Kinematic Evolution Of A Large Paraglacial Landslide In The Barry Arm Fjord Of Alaska
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https://doi.org/10.1029/2023JF007119 <-- shared paper
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https://doi.org/10.5066/P9EUCGJQ <-- shared technical article
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https://www.sciencebase.gov/catalogMaps/mapping/ows/5fff561ed34e592d8671ee85?service=wms&request=getcapabilities&version=1.3.0 <-- shared web mapping service
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#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 -
Kinematic Evolution Of A Large Paraglacial Landslide In The Barry Arm Fjord Of Alaska
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https://doi.org/10.1029/2023JF007119 <-- shared paper
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https://doi.org/10.5066/P9EUCGJQ <-- shared technical article
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https://www.sciencebase.gov/catalogMaps/mapping/ows/5fff561ed34e592d8671ee85?service=wms&request=getcapabilities&version=1.3.0 <-- shared web mapping service
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#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 -
📰 "Coherent Turning Behaviors Revealed Across Adherent Cells"
https://arxiv.org/abs/2503.20304 #Physics.Bio-Ph #Kinematics #Cell -
Unique 3D Printer Has a Print Head With a Twist https://hackaday.com/2024/12/02/unique-3d-printer-has-a-print-head-with-a-twist/ #3dPrinterhacks #kinematics #CoreXY #slicer #polar #theta
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Unique 3D Printer Has a Print Head With a Twist https://hackaday.com/2024/12/02/unique-3d-printer-has-a-print-head-with-a-twist/ #3dPrinterhacks #kinematics #CoreXY #slicer #polar #theta
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Unique 3D Printer Has a Print Head With a Twist - If you’re used to thinking about 3D printing in Cartesian terms, prepare your brai... - https://hackaday.com/2024/12/02/unique-3d-printer-has-a-print-head-with-a-twist/ #3dprinterhacks #kinematics #corexy #slicer #polar #theta
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Unique 3D Printer Has a Print Head With a Twist - If you’re used to thinking about 3D printing in Cartesian terms, prepare your brai... - https://hackaday.com/2024/12/02/unique-3d-printer-has-a-print-head-with-a-twist/ #3dprinterhacks #kinematics #corexy #slicer #polar #theta
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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.
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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.
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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?
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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?
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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
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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
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‘The Apprentice’ Backer Kinematics Confirms Exit From Project, Cites “Creative Differences”
#News #2024election #DonaldTrump #ElectionLine #Kinematics #TheApprentice -
‘The Apprentice’ Backer Kinematics Confirms Exit From Project, Cites “Creative Differences”
#News #2024election #DonaldTrump #ElectionLine #Kinematics #TheApprentice -
More zoetrope plots, flipped the animation and added a few more rings. Next is to use some big paper to get a proper 12” plot 🌀
#PenPlotter #GenerativeArt #CreativeCoding #MastoArt #Art #ArtForSale #Artist #ArtForSaleByArtist #PenPlotterArt #PenPlot #Zoetrope #Animation #Kinematics
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More zoetrope plots, flipped the animation and added a few more rings. Next is to use some big paper to get a proper 12” plot 🌀
#PenPlotter #GenerativeArt #CreativeCoding #MastoArt #Art #ArtForSale #Artist #ArtForSaleByArtist #PenPlotterArt #PenPlot #Zoetrope #Animation #Kinematics
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Forgive the recent apparent obsession (I’d call it a fascination) with the #cycloid but I’ve just discovered something I’d not heard of before. It is also called a #TautochroneCurve or #Isochrone curve, which means that a particle starting from any location on the curve will get to the #MinimumPoint at precisely the same time as a particle starting at any other point.
#Dynamics #Kinematics #Mathematics #AppliedMathematics #Mechanics #ClassicalMecanics #WxMaxima #FreeSoftware #MyWork #CCBYSA
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Forgive the recent apparent obsession (I’d call it a fascination) with the #cycloid but I’ve just discovered something I’d not heard of before. It is also called a #TautochroneCurve or #Isochrone curve, which means that a particle starting from any location on the curve will get to the #MinimumPoint at precisely the same time as a particle starting at any other point.
#Dynamics #Kinematics #Mathematics #AppliedMathematics #Mechanics #ClassicalMecanics #WxMaxima #FreeSoftware #MyWork #CCBYSA
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Interestingly, it is also the curve that solves the #Brachistochrone problem, which means that starting at a cusp on the inverted curve (maximum height), a frictionless ball will roll under uniform gravity in minimum time from the start to any other point on the curve, even beating the straight line path.
#Mathematics #Geometry #Maths #AppliedMathematics #Mechanics #Kinematics #Dynamics #Physics
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Interestingly, it is also the curve that solves the #Brachistochrone problem, which means that starting at a cusp on the inverted curve (maximum height), a frictionless ball will roll under uniform gravity in minimum time from the start to any other point on the curve, even beating the straight line path.
#Mathematics #Geometry #Maths #AppliedMathematics #Mechanics #Kinematics #Dynamics #Physics
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Imagine a circular wheel rolling, without skidding, on a flat, horizontal surface. The #locus of any given point on its #circumference is called a #cycloid. It is a #periodic #curve with #period over the #circle's circumference and has #cusps whenever the point is in contact with the surface (the two sides of the curve are tangentially vertical at that point).
#Mathematics #Geometry #Maths #AppliedMathematics #Mechanics #Kinematics #Dynamics #Physics #MyWork #CCBYSA #WxMaxima
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Imagine a circular wheel rolling, without skidding, on a flat, horizontal surface. The #locus of any given point on its #circumference is called a #cycloid. It is a #periodic #curve with #period over the #circle's circumference and has #cusps whenever the point is in contact with the surface (the two sides of the curve are tangentially vertical at that point).
#Mathematics #Geometry #Maths #AppliedMathematics #Mechanics #Kinematics #Dynamics #Physics #MyWork #CCBYSA #WxMaxima
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The #Kinematics #Dress represents a new approach to manufacturing which tightly integrates design, simulation, and digital fabrication to create complex, customized products.
Composed of thousands of unique interlocking components, each dress is 3D printed as a single folded piece and requires no assembly.
Bodies are 3-dimensional but clothing is traditionally made from flat material that is cut and painstakingly pieced together.
In contrast, Kinematics garments are created in 3D, directly from body scans and require absolutely no assembly.
We employ a smart folding strategy to compress Kinematics garments into a smaller form for efficient fabrication.
By folding the garments prior to printing them, we can make complex structures larger than a 3D printer that unfold into their intended shape.
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The #Kinematics #Dress represents a new approach to manufacturing which tightly integrates design, simulation, and digital fabrication to create complex, customized products.
Composed of thousands of unique interlocking components, each dress is 3D printed as a single folded piece and requires no assembly.
Bodies are 3-dimensional but clothing is traditionally made from flat material that is cut and painstakingly pieced together.
In contrast, Kinematics garments are created in 3D, directly from body scans and require absolutely no assembly.
We employ a smart folding strategy to compress Kinematics garments into a smaller form for efficient fabrication.
By folding the garments prior to printing them, we can make complex structures larger than a 3D printer that unfold into their intended shape.
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#introduction :
#mechanical_designer worked for (mostly) #automotive & #aerospace #industry (work mostly in #Catia) - #3D_models, #drawing creation, #machining different #analysis - #FEM, #kinematics, #assembly analysis, ...
Interested in #technology, #computer, #science, #history, #book #music, #art (any), ...
#Czechia #Praha (#Prague) 🇨🇿
Pronouns she/her -
Our Labs' favourite coworker from Japan, #ShunichiTazuke from @univkyoto, visited our #OpenLab with some of his B.Sc. students! They recorded #kinematics and kinetics of sprint 🏃 using different approaches. A great interactive session, with interested & curious students! 🤩
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Immersing myself into #physics , where do I start? Why #textbooks start with #mechanics and #kinematics ? What should I read starting from #scratch ?
#question #discussion #universe #science #learning #selftaught #philosophy
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Immersing myself into #physics , where do I start? Why #textbooks start with #mechanics and #kinematics ? What should I read starting from #scratch ?
#question #discussion #universe #science #learning #selftaught #philosophy
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Ars Technica: Pew, pew, pew! These plants shoot out their seeds like bullets https://arstechnica.com/?p=1963218 #Tech #arstechnica #IT #Technology #springactuation #Biomechanics #biophysics #kinematics #witchhazel #Science #Biology #science #botany #plants
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Pew, pew, pew! These plants shoot out their seeds like bullets - Scientists have measured just how fast members of the witch hazel family can shoot... - https://arstechnica.com/?p=1963218 #springactuation #biomechanics #biophysics #kinematics #witchhazel #science #biology #botany #plants