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10,561 results for “mechanics”
Data from: Mechanical and structural adaptations to migration in the flight feathers of a Palaearctic passerine
<p>Current avian migration patterns in temperate regions have been developed during the glacial retreat and subsequent colonization of the ice-free areas during the Holocene. This process resulted in a geographic gradient of greater seasonality as latitude increased that favoured migration-related morphological and physiological (co)adaptations. Most evidence of avian morphological adaptations to migration comes from the analysis of variation in the length and shape of the wings, but the existence of intra-feather structural adjustments has been greatly overlooked despite their potential to be under natural selection. To shed some light on this question, we used data from European robins Erithacus rubecula overwintering in Campo de Gibraltar (Southern Iberia), where sedentary robins coexist during winter with conspecifics showing a broad range of breeding origins and, hence, migration distances. We explicitly explored how wing length and shape, as well as several functional (bending stiffness), developmental (feather growth rate) and structural (size and complexity of feather components) characteristics of flight feathers varied in relation to migration distance, which was estimated from the hydrogen stable isotope ratios of the summer-produced tail feathers. Our results revealed that migration distance not only favoured longer and more concave wings, but also promoted primaries with a thicker dorsoventral rachis and shorter barb lengths, which in turn conferred more bending stiffness to these feathers. We suggest that these intra-feather structural adjustments could be an additional, largely unnoticed, adaptation within the avian migratory syndrome that might have the potential to evolve relatively quickly to facilitate the occupation of seasonal environments.</p>
Data from: Vertical differentiation in tropical forest butterflies: a novel mechanism generating insect diversity?
Many tropical fruit-feeding nymphalid butterflies are associated with either the forest canopy or the understory, however, the exceptions offer insights into the origins of tropical diversity. As it occurs in both habitats of tropical forests in Ecuador and Peru, Archaeoprepona demophon is one such exception. We compared patterns of occurrence of A. demophon in the canopy and understory and population genomic variation for evidence of ecological and genetic differentiation between habitats. We found that butterfly occurrences in the canopy were largely uncorrelated with occurrences in the understory at both localities, indicating independent demographic patterns in the two habitats. We also documented modest, significant genome-level differentiation at both localities. Genetic differentiation between habitat types (approximately 20m in elevation) were comparable to levels of differentiation between sampling locations (approximately 1500km). We conclude that canopy and understory populations of A. demophon represent incipient independent evolutionary units. These findings support the hypothesis that divergence between canopy and understory-associated populations might be a mechanism generating insect diversity in the tropics.
Scheduling Mechanisms to Control Spread of Covid-19 (Simulation Results)
<p><span>We study scheduling mechanisms that explore the trade-off between containing the spread of COVID-19 and performing in-person activity in organizations. </span><span>Our mechanisms, referred to as<span> </span></span><i>group scheduling</i><span>, are based on partitioning the population<span> </span></span><i>randomly</i><span><span> </span>into groups and scheduling each group on appropriate days with possible gaps (when no one is working and all are quarantined). Each group interacts with no other group and, importantly, any person who is symptomatic in a group is quarantined.</span><br> <br> <span>We show that our mechanisms effectively trade-off in-person activity for more effective control of the COVID-19 virus spread. In particular, we show that a mechanism which partitions the population into two groups that alternatively work in-person for five days each, flatlines the number of COVID-19 cases quite effectively, while still maintaining in-person activity at 70% of pre-COVID-19 level. Other mechanisms that partitions into two groups with less continuous work days or more spacing or three groups achieve even more aggressive control of the virus at the cost of a somewhat lower in-person activity (about 50%). We demonstrate the efficacy of our mechanisms by theoretical analysis and extensive experimental simulations on various epidemiological models based on real-world data.</span></p>
Mechanical alphabet, TM1357
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1357](https://digitaltmuseum.se/021026544783/mekaniskt-alfabet-modell?i=24&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1357") (TEKS0014671) Created in RealityCapture by Kevin K. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1353
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1353](https://digitaltmuseum.se/021026544747/mekaniskt-alfabet-modell?i=21&aq=text%3A%22polhem%22+owner%3A%22S-TEK%22"tm1353") (TEKS0014629) Created by Kevin K. in Reality Capture. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1981
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1981](https://digitaltmuseum.se/021026544982/mekaniskt-alfabet-modell?aq=text%3A%22polhem%22+owner%3A%22S-TEK%22&i=23"tm1981") (TEKS0021248) Created by Kevin K. in RealityCapture. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Christopher Polhem mechanical wooden modelTM1259
Christopher Polhem mechanical wooden model from the early 1700s This virtual artifact can be found in real life at the [Swedish National Museum of Science and Technology in Stockholm](https://sketchfab.com/Tekniskamuseet) Created in RealityCapture by Fredrik Olsson from 294 images in 01h:18m:28s. Please note: No post processing have been done, holes may occur in mesh Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1973 (Low res.)
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1973](https://digitaltmuseum.se/021026351739/mekaniskt-alfabet-modell?i=34&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1973") (TEKS0021161) Created in RealityCapture by Fredrik Olsson from 356 images in 01h:529m:18s. Please note: No post processing have been done, holes may occur in mesh. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Christopher Polhem mechanical wooden modelTM1973
Christopher Polhem mechanical wooden model from the early 1700s This virtual artifact can be found in real life at the [Swedish National Museum of Science and Technology in Stockholm](https://sketchfab.com/Tekniskamuseet) Created in RealityCapture by Fredrik Olsson from 356 images in 01h:29m:18s. Please note: No post processing have been done, holes may occur in mesh Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1977
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1977](https://digitaltmuseum.se/021026544952/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=18"tm1977") (TEKS0021203) Created by Fredrik Olsson in RealityCapture from 198 images. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical Pony ride
Found this ugly retro mechanical pony ride at a gas station in a small westcoast town in Denmark. It's just a quick rough iPhone scan of a very glossy surface and I didn't clean it up too much, but most of the marks are actually there in reality. It's extremely used. And yes, if you think it looks freaky, it's because it was:  Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1396
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1396](https://digitaltmuseum.se/021026347147/mekaniskt-alfabet-modell?aq=text%3A%22mekaniskt%22%2C%22alfabet%22&i=15"tm1396") (TEKS0015015) Created in RealityCapture by Kevin K. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1975
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1975](https://digitaltmuseum.se/021026544940/mekaniskt-alfabet-modell?aq=text%3A%22polhem%22+owner%3A%22S-TEK%22&i=34"tm1975") (TEKS0021182) Created by Kevin K. in RealityCapture. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1974 (Low res.)
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1974](https://digitaltmuseum.se/021026351749/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=17"tm1974") (TEKS0021172) Created in RealityCapture by Fredrik Olsson from 275 images in 01h:09m:56s. Please note: No post processing have been done, holes may occur in mesh. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1354 (Low res.)
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1354](https://digitaltmuseum.se/021026544763/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=50"tm1354") (TEKS0014640) Created in RealityCapture by Fredrik Olsson from 196 images in 01h:25m:28s. Please note: No post processing have been done, holes may occur in mesh. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1820 (Low res.)
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1820](https://digitaltmuseum.se/021026350327/mekaniskt-alfabet-modell?i=39&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1820") (TEKS0019424) Created in RealityCapture by Fredrik Olsson from 228 images in 00h:50m:13s. Please note: No post processing have been done, holes may occur in mesh. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Christopher Polhem mechanical wooden modelTM1997
Christopher Polhem mechanical wooden model from the early 1700s This virtual artifact can be found in real life at the [Swedish National Museum of Science and Technology in Stockholm](https://sketchfab.com/Tekniskamuseet) Created in RealityCapture by Fredrik Olsson from 317 images in 00h:56m:47s. Please note: No post processing have been done, holes may occur in mesh Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1354
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1354](https://digitaltmuseum.se/021026544763/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=50"tm1354") (TEKS0014640) Created by Fredrik Olsson in RealityCapture from 296 images. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1359
Christopher Polhem (1661-1751) created the so-called mechanical alphabet in the years just before 1700. The wooden models illustrated the fundamentals of physics and mechanics and were intended to serve as an educational tool in teachings at the Laboratorium mechanicum established in 1697. After his death, the collection continued to serve as a didactic instrument and became part of the Swedish Royal Model Chamber. In 1925, the collection of 31 models was deposited at the newly established National Museum of Science and Technology. [TM1359](https://digitaltmuseum.se/021026346912/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=44"tm1359") (TEKS0014693) Created by Fredrik Olsson in RealityCapture from 362 images. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
VELOCITY VECTOR FIELDS, MEASURED AT THE OUTFLOW FROM TWO HINGE MODELS OF A BILEAFLET MECHANICAL HEART VALVE, USING 2-COMPONENT PARTICLE IMAGE VELOCIMETRY TECHNIQUE
<p>VELOCITY VECTOR FIELDS, MEASURED AT THE OUTFLOW FROM TWO HINGE MODELS OF A BILEAFLET MECHANICAL HEART VALVE, USING 2-COMPONENT PARTICLE IMAGE VELOCIMETRY TECHNIQUE</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.