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10,561 results for “mechanics”
Christopher Polhem mechanical wooden modelTM1361
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 124 images in 00h:58m:37s. 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, TM1976 (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. [TM1976](https://digitaltmuseum.se/021026351764/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=36"tm1976") (TEKS0021192) Created in RealityCapture by Fredrik Olsson from 124 images in 00h:07m: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, TM1361 (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. [TM1361](https://digitaltmuseum.se/021026544835/mekaniskt-alfabet-modell?i=43&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1361") (TEKS0014716) Created in RealityCapture by Fredrik Olsson from 381 images in 00h:58m: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
Mechanically articulated doll – a woman
Mechanically articulated doll – a woman sitting on horseback The National Museum in Kraków Inventory number: MNK VI-8321/3 Time of creation: 18th century (epoque Quing, 1644–1911) Place of creation: China https://muzea.malopolska.pl/en/objects-list/2482 Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1970
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. [TM1970](https://digitaltmuseum.se/021026544906/mekaniskt-alfabet-modell?i=28&aq=text%3A%22mekaniskt%22%2C%22alfabet%22"tm1970") (TEKS0021128) Created by Fredrik Olsson in RealityCapture from 184 images. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1360 (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. [TM1360](https://digitaltmuseum.se/021026544809/mekaniskt-alfabet-modell?i=32&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1360") (TEKS0014705) Created by Fredrik Olsson in RealityCapture from 362 images. 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
Mechanically articulated doll – a man
Mechanically articulated doll – a man sitting on an imperial guardian lion The National Museum in Kraków Inventory number: MNK VI-8321/2/a-b Time of creation: 18th century (epoque Quing, 1644–1911) Place of creation: China https://muzea.malopolska.pl/en/objects-list/2483 Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1820
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 by Fredrik Olsson in Reality Capture from 228 images. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM2002 (CT)
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. [TM2002](https://digitaltmuseum.se/021026545046/mekaniskt-alfabet-modell?i=23&aq=owner%3A%22S-TEK%22"tm2002") (TEKS0021480) CT-Scan. Created by Kristofer Jansson, Interspectral. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1400
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. [TM1400](https://digitaltmuseum.se/021026347151/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=41"tm1400") (TEKS0015021) 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, TM1997
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. [TM1997](https://digitaltmuseum.se/021026545025/mekaniskt-alfabet-modell?i=22&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1997") (TEKS0021422) Created by Fredrik Olsson in RealityCapture from 398 images Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1356 (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. [TM1356](https://digitaltmuseum.se/021026346886/mekaniskt-alfabet-modell?i=42&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1356") (TEKS0014660) Created in RealityCapture by Fredrik Olsson from 108 images in 00h:49m:22s. 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
Litter consumption by macrodetritivores depends more on mechanical than on nutritional constraints
<p>Ecosystem functions greatly depend on trophic interactions between consumers and their resources. Resource consumption depends on ingestion, digestion, and allocation processes. Mechanical constraints are expected to influence ingestion, while metabolic and nutritional constraints are expected to influence allocation. Leaf litter are resources presenting a high mechanical and nutritional heterogeneity that depends on plant identity and on physical and microbial processing over the course of decomposition. Litter consumption by detritivores is known to depend on metabolic and nutritional constraints but the importance of mechanical constraints is yet unknown. After accounting for metabolic constraints on consumption rate, we tested the relative importance of mechanical and nutritional constraints in explaining litter consumption rates by detritivores. For this, we exposed 16 leaf treatments (8 leaf species either just leached or leached and microbially conditioned) to 4 aquatic and 5 terrestrial detritivore taxa in laboratory no-choice consumption experiments. We investigated two mechanical constraints: grabbing and fragmenting the resource, by measuring suitable couples of mechanical traits for both litter and detritivores. We also investigated four nutritional constraints related to N, P, K, and Ca contents in both detritivores and litter. For each constraint, we also tested if trait matching significantly contribute to explain consumption. Our analysis revealed that both mechanical and nutritional constraints are influencing mass-independent consumption rate but that mechanical constraints predominate over nutritional constraints. Litter fragmentation, studied through litter toughness and detritivore biting force, was especially important to explain consumption rate. Nutritional constraints were dominated by P constraints. Trait-matching had very weak importance and was significant only for P constraints. Our findings highlight the importance of mechanical constraints for litter consumption by detritivores.</p>
Data from: A mechanism of lysosomal calcium entry
<p>Lysosomal calcium (Ca2+) release is critical to cell signaling and is mediated by well-known lysosomal Ca2+ channels. Yet, how lysosomes refill their Ca2+ remains hitherto undescribed. Here, from an RNAi screen in C. elegans we identify an evolutionarily conserved gene, lci-1, that facilitates lysosomal Ca2+ entry in C. elegans and mammalian cells. We found that its human homolog TMEM165, previously designated as a Ca2+/H+ exchanger (CAX), imports Ca2+ pH-dependently into lysosomes. Using two-ion mapping and electrophysiology we show that TMEM165, hereafter referred to as human LCI, acts as a proton-activated, lysosomal Ca2+ importer. Defects in lysosomal Ca2+ channels cause several neurodegenerative diseases, and knowledge of lysosomal Ca2+ importers may provide new avenues to explore the physiology of Ca2+ channels.</p>
Data from: Genetic mechanism of non-targeted-site resistance to diquat in Spirodela polyrhiza
<p>Understanding non-target-site resistance (NTSR) to herbicides represents a pressing challenge as NTSR is widespread in many weeds. Using the giant duckweed (<em>Spirodela polyrhiza</em>) as a model, we systematically investigated genetic and molecular mechanisms of diquat resistance, which can only be achieved via NTSR. Screening the diquat resistance among 138 genotypes suggested more than 8.5-fold resistance differences. Further experiments suggested that diquat uptake and antioxidant-related processes jointly contributed to diquat resistance in <em>S. polyrhiza</em>. Using a genome-wide association approach, we identified candidate genes that are associated with diquat resistance in <em>S. polyrhiza</em>, which includes a homolog of dienelactone hydrolase.</p>
Touch sensation requires the mechanically-gated ion channel Elkin1
<p>The extraordinary speed of touch perception is enabled by mechanically-activated ion channels, the opening of which excites cutaneous sensory endings to initiate sensation. We identify Elkin1(1) as an ion channel likely gated by mechanical force necessary for normal behavioral touch sensitivity in mice. Touch insensitivity in Elkin1-/- mice was caused by a loss of mechanically-activated currents (MA-currents) in around half of all sensory neurons that are activated by light touch (low threshold mechanoreceptors, LTMRs). Reintroduction of Elkin1 into sensory neurons from Elkin1-/- mice acutely restored MA-currents. Additionally, siRNA mediated knockdown of Elkin1 from induced human sensory neurons substantially reduced indentation-induced MA-currents supporting a conserved role for Elkin1 in human touch. Our data identify Elkin1 as a novel core component of touch transduction in mammals.</p>
Mechanisms for Layered Anisotropy and Anomalous Magmatism of Alaska Subduction System Revealed by Ambient Noise Tomography and the Wave Gradiometry Method
<p>Depth Coverage: 2.0 - 230.0 km<br>Areal Coverage: Latitude: 54.8 to 72.0 Longitude: -168.0 to -129.0<br>Model Description: A high-resolution 3D azimuthal anisotropic shear wave velocity model beneath Alaska and its surroundings on a ~50‐km grid extracted by ambient noise tomography and wave gradiometry method .</p> <p>Columns in the subfile, from left to right, are latitude, longitude, shear wave velocity, fast direction, and the magnitude of anisotropy, respectively. </p>
Longyearbyen CO2 Lab - Porosity, permeability, density and mechanical data
<p>Porosity, permeability, density and mechanical testing measurements on core samples taken from the Longyearbyen CO2 Lab boreholes/drillcore.</p> <p>Sources are indicated in the file name, as are the included data types.</p>
KupferDigital mechanical testing datasets: Stress relaxation and low-cycle fatigue (LCF) tests
<p><span>The Kupfer<em>Digital</em> project deals with the development of a data ecosystem for digital materials research on the basis of ontology-based digital representations of copper and copper alloys. This document provides exemplary mechanical testing datasets for training the developed Kupfer<em>Digital</em> infrastructures. Different types of cast copper alloys were provided for this research and their mechanical testing (stress relaxation and low-cycle fatigue) was performed in the accredited materials testing laboratory, while the test results were reported according to the DIN/ISO standards and attached with the maximum possible metadata about the sample history, equipment, and calibration. The attached content file consisted of the obtained primary raw testing data as well as the secondary datasets of these tests containing the detailed metadata of mechanical testing methods. Such test data files are processed by the Kupfer<em>Digital</em> digital tools to be converted to standardized machine-readable data files.</span></p>
Data from: ESCRT-III-dependent adhesive and mechanical changes are triggered by a mechanism detecting alteration of Septate Junction integrity in Drosophila epithelial cells
<p><span>Barrier functions of proliferative epithelia are constantly challenged by mechanical and chemical constraints. How epithelia respond to and cope with disturbances of barrier functions to allow tissue integrity maintenance is poorly characterized. Cellular junctions play an important role in this process and intracellular traffic contribute to their homeostasis. Here, we reveal that, in <em>Drosophila</em> pupal <em>notum</em>, alteration of the bi- or tricellular septate junctions (SJs) triggers a mechanism with two prominent outcomes. On one hand, there is an increase in the levels of E-cadherin, F-Actin and non-muscle Myosin II in the plane of adherens junctions. On </span><span>the other hand, β-integrin/Vinculin-positive cell contacts are reinforced along the lateral and basal membranes. We found that the weakening of SJ integrity, caused by the depletion of bi- or tricellular SJ components, alters ESCRT-III/Vps32/Shrub distribution, reduces degradation, and instead favours recycling of SJ components, an effect that extends to other recycled transmembrane protein cargoes including Crumbs, its effector β-Heavy Spectrin</span><span> Karst, and </span><span>β-integrin</span><span>. We propose a mechanism by which epithelial cells, upon sensing alterations of the septate junction</span><span>,</span><span> reroute the function of Shrub to adjust the balance of degradation/recycling of junctional cargoes and thereby compensate for barrier junction defects to maintain epithelial integrity.</span></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.