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10,561 results for “mechanics”
Mechanical alphabet, TM1401
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. [TM1401](https://digitaltmuseum.se/021026347152/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22+text%3A%22polhem%22&i=19"tm1401") (TEKS0015022) Created in Agisoft by Kevin K. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Ruins of Tada-Hori mine mechanical plant
Ruins of Tada-Hori mine Smelter mechanical ore dressing plant (多田堀鉱山製錬所機械選鉱場跡) 多田銀銅山は明治28年(1895)、島根県津和野の鉱業家、堀藤十郎礼造が先代の「堀藤十郎伴成」名義で「多田鉱山」という名称で採掘特許を得て、明治30年(1897)から銀・銅・鉛を生産しました。実際の操業は地元の人びとが請負人となり、採鉱・選鉱・製錬が行われました。堀藤十郎礼造は鉱山の近代化を進めるため、経営している鉱山に西欧技術を用いた製錬場、機械選鉱場を導入しました。 明治39年(1906)に多田鉱山では生産規模を拡大するため、それまでの手選鉱から機械選鉱への転換を計画しました。翌年、建物が落成し機械の据え付けが進みました。 しかし、明治40年(1907)秋にはじまった銀・銅の価格暴落によって、明治41年(1908)に鉱山は休業しました。多田鉱山は、大正14年(1925)に久原鉱業(後の日本鉱業) に鉱業権が移るまで、「多田堀鉱山」と呼ばれました。堀家製錬所跡は、昭和48年(1973)の日本鉱業多田鉱山の閉山時に埋め土で覆われました。 Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1358 (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. [TM1358](https://digitaltmuseum.se/021026346901/mekaniskt-alfabet-modell?i=27&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1358") TEKS0014682 Created in RealityCapture by Fredrik Olsson from 349 images in 01h:34m: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
Mechanical alphabet, TM1972 (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. [TM1972](https://digitaltmuseum.se/021026544925/mekaniskt-alfabet-modell?i=25&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1972") (TEKS0021150) Created in RealityCapture by Fredrik Olsson from 230 images in 00h:45m:15s. 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, TM1980
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. [TM1980](https://digitaltmuseum.se/021026544964/mekaniskt-alfabet-modell?i=40&aq=owner%3A%22S-TEK%22+text%3A%22polhem%22"tm1980") (TEKS0021237) Created by Fredrik Olsson in Reality Capture from 334 images. Read more about [Polhem]( https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Mechanical alphabet, TM1974
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 Reality Capture by Kevin K. Read more about [Polhem](https://en.wikipedia.org/wiki/Christopher_Polhem"polhem") on Wikipedia. Source: Objaverse 1.0 / Sketchfab
Christopher Polhem mechanical wooden modelTM1359
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 362 images in 00h:58m:20s. 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, TM1360 (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. [TM1360](https://digitaltmuseum.se/021026544809/mekaniskt-alfabet-modell?aq=owner%3A%22S-TEK%22&i=30"tm1360") (TEKS0014705) 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
Data for: Evolution Reinforces Cooperation with the Emergence of Self-Recognition Mechanisms: an empirical study of the Moran process for the iterated Prisoner's dilemma using reinforcement learning
<p>This contains data used for a paper titled: Evolution Reinforces Cooperation with the Emergence of Self-Recognition Mechanisms: an empirical study of the Moran process for the iterated Prisoner's dilemma using reinforcement learning.</p> <p>Numerous data sets are included, the main being `main.csv` which includes the fixation counts for a number of Moran processes between pairs of players from the Axelrod library.</p> <p>The source code and explanation of the data is here: https://github.com/Axelrod-Python/axelrod-moran. </p> <p> </p>
Mechanism For Perching On Smooth Surfaces Using Aerial Impacts
<p><strong>For many applications the battery life is the limiting factor for a UAV. Perching on the environment extends the operating time of the drone, which can be useful in applications such as surveillance (temporary security measures) and maintenance, and can provide additional stability for precise manipulation and reparation tasks. However, on smooth surfaces, such as glass or the surface of the blades of a wind-turbine, perching is challenging, as the surface should not be damaged.</strong></p> <p> </p> <p><strong>This video shows an experiment in which a drone perches on a smooth surface. A drone is presented with a manipulator that consists of three beams in a triangle structure, with a vacuum-cup on the end of the middle beam.The drone impacts the environment, which ensures sufficient vacuum in the vacuum-cup and a proper perch. Then the drone can be turned off. After a small period the drone is enabled again and takes off. Note that the procedure is performed by a person using an user-interface, while the drone is controlled with position and orientation controllers. </strong></p> <p><br> <strong>Note that this work is an application based on the knowledge gained from the work “Compliant Aerial Manipulators: Developing the New Generation of Aerial Robotic Workers”. The work has been extended to automate the perch and actively maintain the vacuum-level in the perched state in the work “Autonomous And Sustained Perching On Smooth Surfaces”.</strong></p>
Figure 8. Exchange mutation.-Neuroevolution Mechanism for Hidden Markov Model
<p>Exchange two neighbor weights involved in a summation of 1.0. This is illustrated in Figure 8.</p>
Plasticity and associated epigenetic mechanisms play a role in thermal evolution during range expansion
<p>Due to global change many species are shifting their distribution and are thereby confronted with novel thermal conditions at the moving range edges. <span>Especially during the initial phases of exposure to a new environment, it has been hypothesized that plasticity and associated epigenetic mechanisms enable species to cope with environmental change.</span> We tested this idea by capitalizing on the well-documented southward range expansion of the damselfly Ischnura elegans from France into Spain where the species has invaded warmer regions in the 1950s in eastern Spain (old edge region) and in the 2010s in central Spain (new edge region). Using a common garden experiment at rearing temperatures matching the ancestral and invaded thermal regimes, we tested for evolutionary changes in (thermal plasticity in) larval life history and heat tolerance in these expansion zones. Through the use of de- and hypermethylating agents we tested whether epigenetic mechanisms play a role in enabling heat tolerance during expansion. We used the phenotype of the native sister species in Spain, I. graellsii, as proxy for the locally adapted phenotype. New edge populations converged towards the phenotype of the native species through plastic thermal responses in life history and heat tolerance while old edge populations (partly) constitutively evolved a faster life history and higher heat tolerance than the core populations, thereby matching the native species. Only the heat tolerance of new edge populations increased significantly when exposed to the hypermethylating agent. This suggests that the DNA methylation machinery is more amenable to perturbation at the new edge and shows it is able to play a role in achieving a higher heat tolerance. Our results show that both (evolved) plasticity as well as associated epigenetic mechanisms are initially important when facing new thermal regimes but that their importance diminishes with time.</p>
Solution-Based Synthesis of Oxide-Free MoS2 Film: Exploring Interface Mechanisms
<p>We present a novel method for synthesizing oxidation-free MoS2 films, focusing on interface mechanisms. By utilizing a sulfurization-free solution process and single-step annealing, we fabricate films on Si3N4 surfaces with improved uniformity, exhibiting surface roughness below 0.5 nm and a 4 nm thickness at a precursor concentration of 30 mM, annealed between 700 and 800ºC. Characterization reveals a hexagonal lattice structure with crystallographic orientations of (1 1 0 0) and (1 2 1 0), featuring lattice spacings of 0.27 nm and 0.16 nm, respectively. XPS analysis on SiO2 substrates shows migration of oxygen species, evidenced by a Si 2p spectrum shift to binding energies between 102.6 eV and 102.8 eV. MoS2 films on Si3N4 exhibit a complex Si 2p peak evolution between 100.9 eV and 101.8 eV, providing insights into oxide-free MoS2 film synthesis for advanced electronic devices. This dataset includes all the raw data associated with this study.</p>
Supplementary data: Exploring Remanufacturing Conveniency: An Economic and Energetic Assessment for a Closed-Loop Supply Chain of a Mechanical Component
<p>The conveniency between remanufacturing a single mechanical product and its new production is a highly investigated topic across various disciplines, including supply chain management. To this end, a comparison was made among three different configurations of the supply chain network: the traditional network for new production, the network with remanufacturing and direct interaction between customer and manufacturer, and the network with remanufacturing and indirect interaction between customer and manufacturer through a distribution center. The evaluation of scenarios for the remanufacturing conveniency of remanufacturing was conducted from both an economic and energetic perspective, generating 10'000 cases using the Sobol quasi-random low-discrepancy sequence. The generation was carried out for both economic and energetic analyses for three types of materials, namely steel, aluminum, and titanium, for which complete datasets are provided:</p> <ul> <li><strong>Steel_EconomicAnalysis.xlsx</strong>: dataset for economic analysis for the remanufacturing conveniency of mechanical products in steel</li> <li><strong>Steel_EnergeticAnalysis.xlsx</strong>: dataset for energetic analysis for the remanufacturing conveniency of mechanical products in steel</li> <li><strong>Aluminum_EconomicAnalysis.xlsx</strong>: dataset for economic analysis for the remanufacturing conveniency of mechanical products in aluminum</li> <li><strong>Aluminum_EnergeticAnalysis.xlsx</strong>: dataset for energetic analysis for the remanufacturing conveniency of mechanical products in aluminum</li> <li><strong>Titanium_EconomicAnalysis.xlsx: </strong>dataset for economic analysis for the remanufacturing conveniency of mechanical products in titanium</li> <li><strong>Titanium_EnergeticAnalysis.xlsx</strong>: dataset for energetic analysis for the remanufacturing conveniency of mechanical products in titanium</li> </ul>
Data for 'From Gel to Crystal: Mechanism of HfO2 and ZrO2 Nanocrystal Synthesis in Benzyl Alcohol'
<p>Data of the figures in the publication "<strong>From Gel to Crystal: Mechanism of HfO<sub>2</sub> and ZrO<sub>2</sub> Nanocrystal Synthesis in Benzyl Alcohol</strong>".</p> <p>The <em>.pxp</em> documents contain the experimental data of the figures in the manuscript and they can be opened/edited with the software IGOR Pro 6.3 or higher.</p> <p>Table of contents:</p> <p><strong>Figure 1.</strong> (A) Microwave-assisted solvothermal synthesis of HfO<sub>2</sub> nanocrystals starting from HfCl<sub>4</sub>·2THF in benzyl alcohol. (B) XRD spectrum (black) with a monoclinic reference spectrum (blue, Crystallographic Open Database ID 9013470). (C) Pictures of the upside down microwave tube, stopped at different time points in the reaction to indicate the disappearance of the gel over time. (D) TEM image of the synthesized NCs shows their ellipsoidal shape. The size distribution and a zoom of a single NC are shown in the top and bottom left corner, respectively. (E) The rapid increase in storage modulus <em>G</em>′ and loss modulus <em>G</em>″ over time (average of 3 measurements) indicates the point where the solution turns into a gel. (F) Storage modulus <em>G</em>′ and loss modulus <em>G</em>″ of the gel after repeatedly (three cycles) applying 10% (stress) and 1% (recovery) shear stress (γ) at 25 °C and (G) at 160 °C.</p> <p><strong>Figure 2.</strong> (A) Titration of HfCl<sub>4</sub>·2THF with benzyl alcohol in the presence of TOPO in C<sub>6</sub>D<sub>6</sub>, followed via <sup>31</sup>P NMR. The spectra have a relative <em>x</em>-offset of 1 ppm with respect to each other for clarity. (B) Coordination numbers of chloride and oxygen surrounding the hafnium center, calculated from the EXAFS data. (C) Hf–O distance contraction at increasing temperature. The octahedral of the HfCl<sub>3</sub>OBn·2THF structure is shown for clarity.</p> <p><strong>Figure 3. </strong>(A) <sup>1</sup>H NMR assignment of the resonances in the supernatant between 4.4 and 4.8 ppm. The full width at half-maximum (in Hz) of the benzyl alcohol peak is indicated and decreases with increasing temperature. (B) Equivalents of benzyl alcohol, dibenzyl ether, and benzyl chloride with respect to hafnium (taking into account other side products present) in the reaction supernatant at increasing temperature. The amount of water is calculated based on the amount of dibenzyl ether and benzyl chloride detected.</p> <p><strong>Figure 4. </strong>(A) <em>In situ</em> total scattering data showing <em>G</em>(<em>r</em>) as a function of time. Dashed lines indicate when temperature is increased. Selected PDFs from the intermediate and the final stage of the reaction are plotted. (B) PDF of the precursor structure with major peaks assigned and in comparison to simulated PDFs based on the possible precursor structures. Fit of the PDF data of (C) the intermediate gel, collected after 9 min of reaction at 150 °C, and (D) the final product to m-HfO<sub>2</sub>, collected after 81 min of total reaction time. (E) Refined crystallite size and scale factor as a function of time. (F) TEM image of a sample after 3 min at 220 °C. The size distribution (25 particles) and zoom of a single NC are shown in the top and bottom left corner, respectively.</p> <p><strong>Figure 5. </strong>Isolated particle yield of HfO<sub>2</sub> NC syntheses run for different reaction times. The yield can be significantly improved at only 1 h by adding water postsynthesis. Each reaction is performed in triplicate, and yield is determined gravimetrically.</p>
Molecular Dynamics (MD) Simulation Data for Dynamics Underlie the Drug Recognition Mechanism by the Efflux Transporter EmrE
<p>MD simulations on the proton bound (PDB 8UWU), deprotonated on E14A (PDB 8UWU), TPP Bound (PDB 8UWU) on our NMR derived structures.</p> <p> </p> <p>MD simulations on the proton bound (7MH6) and deprotonated on E14A (7MH6) on X-ray structures. </p> <p> </p> <p>Total raw simulation data would be too large for uploading to repositories. To reduce size of file, starting structure and tpr files are uploaded. Final structure at 2.5 μs are also uploaded. </p>
Mechanisms of enhanced cardiorespiratory performance under hyperoxia differ with exposure duration in yellowtail kingfish
<p>Hyperoxia has been shown to expand the aerobic capacity of some fishes, although there have been very few studies examining the underlying mechanisms and how they vary across different exposure durations. Here, we investigated cardiorespiratory function of yellowtail kingfish (<em>Seriola lalandi</em>) acutely (~20 hours) and chronically (3-5 weeks) acclimated to hyperoxia (~200 % air saturation). Our results show that aerobic performance of kingfish is limited in normoxia and increases with environmental hyperoxia. Aerobic scope was elevated in both hyperoxia treatments driven by a ~33% increase in maximum O<sub>2</sub> uptake (MO<sub>2max</sub>), although the mechanisms differed across treatments. Fish acutely transferred to hyperoxia primarily elevated tissue O<sub>2</sub> extraction, while increased stroke volume-mediated maximum cardiac output was the main driving factor in chronically acclimated fish. Still an improved O<sub>2</sub> delivery to the heart in chronic hyperoxia was not the only explanatory factor as such. Here, maximum cardiac output only increased in chronic hyperoxia compared to normoxia when plastic ventricular growth occurred, as increased stroke volume was partly enabled by an ~8-12% larger relative ventricular mass. Our findings suggest that hyperoxia may be used long-term to boost cardiorespiratory function potentially rendering fish more resilient to metabolically challenging events and stages in their life-cycle.</p>
Dataset for the manuscript "Amapari Marker Band Metal-Enrichments: Potential Mechanisms and Implications for Surface and Subsurface Water and Weathering in Gale crater"
<p>The dataset for the main manuscript contains three CSV files: list of long distance remote micro images (LDRMIs), the ChemCam chemical data, and the alpha particle X ray spectrometer (APXS) chemical data. The LDRMI csv lists two sets of data, one for the sol (Mars solar day), sequence identifier, and target name of LDRMIs that target the Amapari Marker Band (AMB). These are represented as green points on manuscript Figure 1. The second list are for LDRMI images that did not specifically target the AMB, but contain the AMB, and these are orange points on manuscript Figure 1. The ChemCam data file has metadata for each observation point in a ChemCam target: file name, spacecraft clock, observation number, stratigraphic member, rock type, target distance, and total of all spectral channels. Chemical information includes: the oxide chemistry (oxide wt%), uncertainty (RMSEP accuracy and shot-to-shot precision), minor element quantification, and minor element uncertainty (ppm), preliminary sulfate composition (without uncertainty and only provided up to sol 3778), peak areas for some elements (Cu, Zn, and Cr). The oxide sum includes all oxides and elements for which we have quantitative data. Spectral unmixing qualitative values are listed for each element. Derived data includes the corrected MgO, Na<sub>2</sub>O, and CaO in both mol and oxide wt% (values before and after correction are provided), and the calculated alteration index. Derived data is only calculated for AMB bedrock targets (does not include veins or mixed vein-rock targets with elevated CaO). The APXS data sheet provides sol, target name, oxide data, and uncertainties for the drill tailings observations, and the derived data for each target.</p>
Virus – calcium carbonate composites: Possible mechanisms of bacteriophage-induced vaterite formation - Dataset
<p>Raw data (optical microscopy, electron microscopy, X-ray diffraction) from carbonate precipitation experiments in the presence of bacterial viruses.</p>
Physical and Mechanical Properties of Chir Pine (Pinus roxburghii) after vacuum drying.
<p>The study was conducted on Pinus roxburghii (Chir pine) wood under a convective vacuum dryer. Wooden planks were seasoned at 45℃ above 20% moisture content and at 50℃ below 20% moisture content to final moisture content of 8 % to 12 %. It was found that all the physical and mechanical properties under study were increased. This study will encourage convective vacuum seasoning of timber for fast and defect-free drying.</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.