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2,118 results for “Metal”
Data from: Paleolimnological assessment of wildfire-derived atmospheric deposition of trace metal(loid)s and major ions to subarctic lakes (Northwest Territories, Canada)
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Data from: Demographic history of the trace metal hyperaccumulator Noccaea caerulescens (J. Presl and C. Presl) F. K. Mey. in Western Europe
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Lichen resurvey with heavy metal analysis in Maricopa County, central Arizona, period 1998
The major research questions are: (1) In relation to a systematic survey conducted in the 1970s, determine whether the same suite of species can be found, and (2) whether trends in elemental deposition patterns are evident both spatially and, to a limited degree, temporally (mid-1970s compared to 1998) based on an analysis of populations.
Distribution of metal axes as a function of soil pH
<p>As part of a Master's thesis, the intensity of metal axes as a function of soil pH was estimated. The metal axes were found by private metal detectorists in England and Wales (Portable Antiquities Scheme), Denmark (Digitale Metaldetektorfund) and the Netherlands (Portable Antiquities Scheme). Calculations were performed with the 'rhohat' function in R. </p>
Kernel Density Estimation of metal axes from Denmark, England, Wales and the Netherlands
<p>As part of a Master's thesis, Kernel Density Estimations (KDEs) using likelihood cross-validation bandwidth were calculated for metal axes found by private metal detectorists. The data derives from England and Wales (Portable Antiquities Scheme), Denmark (Digitale Metaldetektorfund) and the Netherlands (Portable Antiquities Scheme). Calculations were performed with the 'density' function in R. </p>
Cost-Effective Methods to Retrofit Metal Culverts Using Composites
<p>One of the current pressing problems for all DOTs is the corrosion-oriented deterioration of existing metal culverts. These metal culverts typically are designed for a life of 50 years. However, corrosion is making them last no longer than 30 years. A Glass Fiber Reinforced Polymers (GFRP) pipe section has been evaluated as a fit-in GFRP profile liner for complete repair and rehabilitation of the corroded metal culvert with an expected life of 75 years. This is mainly because of the corrosion free nature of the GFRP material. A comprehensive rehabilitation methodology and laboratory scale three-point bending test was conducted to test the composite action of the steel-GFRP section. A finite element model was developed to provide inference on the mechanics of the GFRP-CMP section and the effect of corrosion on the mechanics of the retrofitted pipe. The FE model was verified with experimental observations and will be used to design GFRP section for retrofitting an existing culvert in the field. A Life Cycle Cost Analysis model was developed to conduct a cost-benefit analysis of the proposed retrofitting technique and compare it with other existing technologies.</p>
Data from: Synchrotron-X-ray fluorescence analysis reveals diagenetic alteration of fossil melanosome trace metal chemistry
<p>A key feature of the pigment melanin is its high binding affinity for trace metal ions. In modern vertebrates trace metals associated with melanosomes, melanin-rich organelles, can show tissue- and taxon-specific distribution patterns. Such signals preserve in fossil melanosomes, informing on the anatomy and phylogenetic affinities of fossil vertebrates. Fossil and modern melanosomes, however, often differ in trace metal chemistry; in particular, melanosomes from fossil vertebrate eyes are depleted in Zn and enriched in Cu relative to their extant counterparts. Whether these chemical differences are biological, or taphonomic, in origin is unknown, limiting our ability to use melanosome trace metal chemistry to test palaeobiological hypotheses. Here, we use maturation experiments on eye melanosomes from extant vertebrates and synchrotron rapid scan-X-ray fluorescence analysis to show that thermal maturation can dramatically alter melanosome trace element chemistry. In particular, maturation of melanosomes in Cu-rich solutions results in significant depletion of Zn, likely due to low pH and competition effects with Cu. These results confirm fossil melanosome chemistry is susceptible to alteration due to variations in local chemical conditions during diagenesis and that maturation experiments can provide essential data on melanosome chemical taphonomy required for accurate interpretations of preserved chemical signatures in fossils.</p>
Data for article "Tracking Charge Transfer to Residual Metal Clusters in Conjugated Polymers for Photocatalytic Hydrogen Evolution"
<p>Data presented in the publication "Tracking Charge Transfer to Residual Metal Clusters in Conjugated Polymers for Photocatalytic Hydrogen Evolution", published in the Journal of the American Chemical Society. The published article is available at <a href="https://doi.org/10.1021/jacs.0c06104">https://doi.org/10.1021/jacs.0c06104</a></p>
Nitrogen‐Doped Carbons with Hierarchical Porosity via Chemical Blowing Towards Long‐Lived Metal‐Free Catalysts for Acetylene Hydrochlorination
<p>Porous nitrogen-doped carbons (NCs) are sustainable alternatives to the toxic mercury-based acetylene hydrochlorination catalysts applied in the manufacture of polyvinyl chloride. However, the application of NCs as metal-free catalysts is hampered by their insufficient durability under industrially relevant process conditions. In particular, pore blockage leads to accelerated deactivation of NCs compared to the state-of-the-art precious metal-based systems. Herein, we develop a salt template-assisted synthesis strategy coupled with chemical blowing to tune the textural properties of NCs, while preserving the N-content and speciation. The addition of metal salts (i.e., Mg(OAc)2 or CaCO3) enhances gas evolution, leading to an increased formation of micro- and mesopores, while the in-situ generated CaO/CaCl2 and MgO/MgCl2 develop auxiliary pore networks. Micropores are easily blocked during acetylene hydrochlorination, but meso- and macropores are structurally stable, enhancing the lifetime of hierarchical NCs by ca. 50 times compared to their non-templated analogues, rivalling the stability of benchmark metal-based catalysts.</p>
Coupled magnetic and structural phase transitions in antiferromagnetic polar metal Pb2CoOsO6 under pressure
<p>This data repo. includes the optimized structures of Pb2CoOsO6 under pressures up to 9 GPa. The structures were fully optimized in the DFT calculations using VASP code. </p>
Data for the strength-ductility enhancement of 316L stainless steel meta-crystal lattice of architected materials by harnessing the non-equilibrium solidification in metal additive manufacturing
<p>Raw (tabular) CALPHAD data for SLM produced 316L stainless steel.</p>
Pico-meter resolution structure of the coordination sphere in the metal-binding site in a metalloprotein by NMR
<p>NMR datasets and pulse sequences used in the paper</p>
Pulsation-driven Mass Loss from Massive Stars behind Stellar Mergers in Metal-poor Dense Clusters
<p>MESA inlists, run_star_extras, and data associated with Nakauchi, Inayoshi, Omukai 2020. MESA version</p> <p>12115.</p>
Keep heavy metal for music not science
<p>This image was drawn based on a paper entitled On the Necessity of Banning the Term “Heavy Metal” from the Scientific Literature by Olivier Pourret, link https://www.mdpi.com/2071-1050/10/8/2879.</p>
Raw data and Figures for the article "Strain Wave Pathway to Semiconductor-to-Metal Transition Revealed by Time Resolved X-ray Powder Diffraction"
<p>- Raw data from Jungfrau Integrating pixel detector (together with azimuthally averaged curves)</p> <p>- Script to create time resolved data from raw data</p> <p>- Scripts to generates main figures of the article.</p>
Synthesis, characterization and CO2 adsorption studies of DABCO based pillared Zn-BDC and Co-BDC metal organic frameworks
<p><span>This study focuses on pre-synthetic functionalized MOF material normally known as pillared layer MOFs. An additional component DABCO (1,4-diazabicyclo[2.2.2] octane) is added to the MOFs which works as a pillar to produce 3d structured MOFs. Zn-BDC-DABCO and Co-BDC-DABCO were studied for their performance in CO<sub>2</sub> capture application. The addition of DABCO turns the 2d-layered metal-BDC lattice to a 3d structure with enhance performance for CO<sub>2</sub> capture. The MOFs were characterized using XRD, SEM, TGA, FTIR and BET and the CO<sub>2</sub> capture capacity was tested at 25</span><span>°C and 0-25 bar. Zn-BDC-DABCO and Co-BDC-DABCO showed a maximum adsorption capacity of 6.3 and 4.4 mol/kg CO<sub>2</sub>.</span></p>
Giant enhancement of third-harmonic generation in graphene-metal heterostructures
<p>The uploaded data includes all the necessary files to replicate the results in this article. </p>
Pd metal reference
<a href="https://spectroscopyhub.com/measurements/84678ccc-f81a-4546-97fe-c4175fb8fce1">Pd metal reference</a>
Data from: RAD-sequencing reveals within-generation polygenic selection in response to anthropogenic organic and metal contamination in North Atlantic Eels
Measuring the effects of selection on the genome imposed by human-altered environment is currently a major goal in ecological genomics. Given the polygenic basis of most phenotypic traits, quantitative genetic theory predicts that selection is expected to cause subtle allelic changes among covarying loci rather than pronounced changes at few loci of large effects. The goal of this study was to test for the occurrence of polygenic selection in both North Atlantic eels (European Eel, Anguilla anguilla and American Eel, A. rostrata), using a method that searches for covariation among loci that would discriminate eels from "control" vs. "polluted" environments and be associated with specific contaminants acting as putative selective agents. RAD-seq libraries resulted in 23,659 and 14,755 filtered loci for the European and American Eels respectively. A total of 142 and 141 covarying markers discriminating European and American Eels from "control" vs. "polluted" sampling localities were obtained using the Random Forest algorithm. Distance-based redundancy analyses (db-RDAs) were used to assess the relationships between these covarying markers and concentration of 34 contaminants measured for each individual eel. PCB153, 4'4'DDE and selenium were associated with covarying markers for both species, thus pointing to these contaminants as major selective agents in contaminated sites . Gene enrichment analyses suggested that sterol regulation plays an important role in the differential survival of eels in "polluted" environment. This study illustrates the power of combining methods for detecting signals of polygenic selection and for associating variation of markers with putative selective agents in studies aiming at documenting the dynamics of selection at the genomic level, and particularly so in human altered environments.
Data from: Electrokinetic remediation of heavy metals from municipal solid waste incineration fly ash pretreated by nitric acid
Municipal Solid Waste Incineration (MSWI) fly ash has high concentration of Heavy Metals (HMs) which are hazardous to environment. Moreover, it has high pH and buffering capacity which hinders the removal of HMs. Another constraining factor is considerable fraction of HMs which existe in oxidizable and reducible states. The acid pretreatment of MSWI fly ash is key solution to these problem. Therefore, current experiment is carried out to evaluate the effect of acid pretreatment of MSWI fly ash and reaction/proposed time on removal efficiency of HMS through electrokinetic experiment. The leaching experiment results show that acid pretreatment has increased the desorption/release of heavy metals ions (Pb2+, Cd2+, Cu2+ and Zn2+). It enhances the migration of HMs ions in electrolytic cell which get precipitated at cathode thereby increasing the removal efficiency of HMS in electrokintic experiment. Moreover, it is found that prolonged proposed time (12 d) has significant effect on removal efficiency of HMs. Finally, it is concluded that acid pretreatment and prolonged proposed time has enhanced the removal electrokinetic remediation of HMS which is carried out via three process i.e. desorption (enhanced by acidification), migration and precipitation.
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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.