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المؤلفون: Helen Cheyne, Amir Gandomi, Shahrzad Hosseini Vajargah, Victoria M. Catterson, Travis Mackoy, Lauren Mccullagh, Gabriel Musso, Negin Hajizadeh
الوصف: BackgroundThe most common cause of death in people with COVID-19 is acute respiratory distress syndrome (ARDS). ARDS is a heterogeneous syndrome, however, subgroups that have been identified among non-COVID-19 ARDS patients do not clearly apply to COVID-19 ARDS patients. Additionally, studies of COVID-19 ARDS have been limited by sample size.MethodsWe applied an iterative clustering and machine learning framework to electronic health record data from thousands of hospitalized COVID-19 ARDS patients with the goal of defining and characterizing clinically-relevant COVID-19 ARDS subgroups (phenoclusters). We then applied a supervised model to identify risk factors for hospital mortality for each phenocluster and compared these between phenoclusters and the entire cohort.FindingsRisk factors that predict mortality in the overall cohort of COVID-19 ARDS patients do not necessarily predict mortality in phenoclusters. In fact, some risk factors increase the risk of hospital mortality in some phenoclusters, but decrease mortality in others.InterpretationThese phenocluster-specific risk factors would not have been observed with a single predictive model. Heterogeneity in phenoclusters of COVID-19 ARDS as well as drivers of mortality may partially explain challenges in finding effective treatments when applied to all patients with ARDS.FundingThis work was supported by philanthropic funds to the Feinstein Institutes for Medical Research. The funding source did not control any aspect of the study and did not review the results. All authors had full access to the full data in the study and accept responsibility to submit for publication.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b9c4001b20670d2a1fa5af0e28218e6
https://doi.org/10.1101/2022.07.04.22277239 -
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المؤلفون: Babak Afshin-Pour, Michael Qiu, Shahrzad Hosseini Vajargah, Helen Cheyne, Kevin Ha, Molly Stewart, Jan Horsky, Rachel Aviv, Nasen Zhang, Mangala Narasimhan, John Chelico, Gabriel Musso, Negin Hajizadeh
المصدر: Intelligence-Based Medicine. 7:100087
مصطلحات موضوعية: Artificial Intelligence, Medicine (miscellaneous), Health Informatics, Computer Science Applications
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المؤلفون: Shahrzad Hosseini Vajargah, Mahalingam Balasubramanian, Lauren Blanc, Xiaoqi Sun, Linda F. Nazar, Chang Wook Lee, Patrick Bonnick
المصدر: Chemistry of Materials. 30:4683-4693
مصطلحات موضوعية: X-ray absorption spectroscopy, Materials science, Rietveld refinement, General Chemical Engineering, Intercalation (chemistry), 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 01 natural sciences, 0104 chemical sciences, Crystallography, Octahedron, Interstitial defect, Materials Chemistry, Isostructural, 0210 nano-technology, Faraday efficiency
الوصف: The Mg battery cathode material, thiospinel MgxZr2S4 (0 ≤ x ≤ 1), exhibits negligible volume change (ca. 0.05%) during electrochemical cycling, providing valuable insight into the limiting factors in divalent cation intercalation. Rietveld refinement of XRD data for MgxZr2S4 electrodes at various states of charge, , coupled with EDX analysis, demonstrates that Mg2+ can be inserted into Zr2S4 at 60 °C up to x = 0.7 at a C/10 rate (up to x = 0.9 at very slow rates) and cycled with a high Coulombic efficiency of 99.75%. HAADF-STEM studies provide clear visual evidence of Mg-ion occupation in the lattice, whereas XAS studies show that Zr4+ was reduced upon Mg2+ intercalation. Operando and synchrotron XRD studies reveal the creation of two phases during the latter stages of discharge (x > 0.5) as the lattice fills and Mg2+ ions begin occupying tetrahedral (8a) sites in addition to octahedral (16c) interstitial sites. Compared to the isostructural Ti2S4 thiospinel, Zr2S4 presents a slightly larger cell volume a...
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المؤلفون: David Prendergast, Liwen F. Wan, Dipan Kundu, Linda F. Nazar, Brian D. Adams, Shahrzad Hosseini Vajargah
المصدر: Energy & Environmental Science. 11:881-892
مصطلحات موضوعية: Aqueous solution, Materials science, Renewable Energy, Sustainability and the Environment, Diffusion, Intercalation (chemistry), chemistry.chemical_element, 02 engineering and technology, Zinc, Electrolyte, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, 7. Clean energy, 01 natural sciences, Pollution, 0104 chemical sciences, Ion, Nuclear Energy and Engineering, Chemical engineering, chemistry, Monolayer, Environmental Chemistry, 0210 nano-technology
الوصف: Zinc ion batteries using metallic zinc as the negative electrode have gained considerable interest for electrochemical energy storage, whose development is crucial for the adoption of renewable energy technologies, as zinc has a very high volumetric capacity (5845 mA h cm−3), is inexpensive and compatible with aqueous electrolytes. However, the divalent charge of zinc ions, which restricts the choice of host material due to hindered solid-state diffusion, can also pose a problem for interfacial charge transfer. Here, we report our findings on reversible intercalation of up to two Zn2+ ions in layered V3O7·H2O. This material exhibits very high capacity and power (375 mA h g−1 at a 1C rate, and 275 mA h g−1 at an 8C rate) in an aqueous electrolyte compared to a very low capacity and slow rate capabilities in a nonaqueous medium. Operando XRD studies, together with impedance analysis, reveal solid solution behavior associated with Zn2+-ion diffusion within a water monolayer in the interlayer gap in both systems, but very sluggish interfacial charge transfer in the nonaqueous electrolyte. This points to desolvation at the interface as a major factor in dictating the kinetics. Temperature dependent impedance studies show high activation energies associated with the nonaqueous charge transfer process, identifying the origin of poor electrochemical performance.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::67c1e7fd760de1606cc6b71ad78ed0e2
https://doi.org/10.1039/c8ee00378e -
5دورية أكاديمية
المصدر: Nature, Nature Energy. 1(10):1-8
الوصف: Although non-aqueous Li-ion batteries possess significantly higher energy density than their aqueous counterparts, the latter can be more feasible for grid-scale applications when cost, safety and cycle life are taken into consideration. Moreover, aqueous Zn-ion batteries have an energy storage advantage over alkali-based batteries as they can employ Zn metal as the negative electrode, dramatically increasing energy density. However, their development is plagued by a limited choice of positive electrodes, which often show poor rate capability and inadequate cycle life. Here we report a vanadium oxide bronze pillared by interlayer Zn2+ ions and water (Zn0.25V2O5⋅nH2O), as the positive electrode for a Zn cell. A reversible Zn2+ ion (de)intercalation storage process at fast rates, with more than one Zn2+ per formula unit (a capacity up to 300 mAh g−1), is characterized. The Zn cell offers an energy density of ∼450 Wh l−1 and exhibits a capacity retention of more than 80% over 1,000 cycles, with no dendrite formation at the Zn electrode.
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المؤلفون: Xiaohan Wu, Linda F. Nazar, Gillian R. Goward, J. David Bazak, Shahrzad Hosseini Vajargah, Joern Kulisch, Kavish Kaup
المصدر: Advanced Energy Materials. 10:1902783
مصطلحات موضوعية: Materials science, Renewable Energy, Sustainability and the Environment, chemistry.chemical_element, 02 engineering and technology, Electrolyte, Conductivity, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry, Chemical engineering, Fast ion conductor, General Materials Science, Lithium, 0210 nano-technology
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المصدر: International Journal of Applied Ceramic Technology. 5:464-468
مصطلحات موضوعية: Marketing, Diffraction, Materials science, Scanning electron microscope, Analytical chemistry, Yttrium iron garnet, Mineralogy, Condensed Matter Physics, Combustion, Nanocrystalline material, law.invention, chemistry.chemical_compound, chemistry, law, Materials Chemistry, Ceramics and Composites, Calcination, Crystallite, Sol-gel
الوصف: Nanocrystalline Y3� xMMxFe5O12 powders (MM denotes Misch-metal, x 5 0.0, 0.25, 0.5, 0.75, and 1.0) were synthesized by a sol–gel combustion method. Magnetic properties and crystalline structures were investigated using X-ray diffraction (XRD), a vibrating sample magnetometer (VSM), and a scanning electron microscope. The XRD patterns showed that the single-phase garnet of Y3� xMMxFe5O12 was formed at x values r1.0. The saturation magnetization of powders increased with decreasing MM content and reached the maximum value at Y3Fe5O12. The crystallite size of powders calcined at 8001C for 3 h was in the range of 38–53 nm.
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المؤلفون: Feihong Nan, Steffi Y. Woo, Mickey C. Y. Chan, Guo-zhen Zhu, David Rossouw, Shahrzad Hosseini Vajargah, Gianluigi A. Botton
المصدر: Acta Crystallographica Section A Foundations of Crystallography. 67:C148-C149
مصطلحات موضوعية: Materials science, Structural Biology, Electron energy loss spectroscopy, Nanotechnology, Electronic structure, Molecular physics, Nanomaterials
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المؤلفون: Edward Wasige, Janina Möreke, Sarah J. Haigh, Colin J. Humphreys, David J. Wallis, Martin Kuball, Michael J. Uren, Sergei V. Novikov, Abdullah Al-Khalidi, Shahrzad Hosseini Vajargah, C. Thomas Foxon, Iain G. Thayne
المصدر: Journal of Applied Physics. 116:014502
مصطلحات موضوعية: Materials science, business.industry, Doping, Wide-bandgap semiconductor, General Physics and Astronomy, Heterojunction, Band offset, Gallium arsenide, chemistry.chemical_compound, chemistry, Etching (microfabrication), Optoelectronics, business, Ohmic contact, Molecular beam epitaxy
الوصف: GaN layers were grown onto (111) GaAs by molecular beam epitaxy. Minimal band offset between the conduction bands for GaN and GaAs materials has been suggested in the literature raising the possibility of using GaN-on-GaAs for vertical power device applications. I-V and C-V measurements of the GaN/GaAs heterostructures however yielded a rectifying junction, even when both sides of the junction were heavily doped with an n-type dopant. Transmission electron microscopy analysis further confirmed the challenge in creating a GaN/GaAs Ohmic interface by showing a large density of dislocations in the GaN layer and suggesting roughening of the GaN/GaAs interface due to etching of the GaAs by the nitrogen plasma, diffusion of nitrogen or melting of Ga into the GaAs substrate.
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المؤلفون: Gianluigi A. Botton, S Tavakoli, Shahrzad Hosseini Vajargah, Rafael N. Kleiman, Martin Couillard, Yang Shao, John S. Preston
المصدر: Microscopy and Microanalysis. 16:1338-1339
مصطلحات موضوعية: Materials science, Analytical chemistry, Instrumentation
الوصف: Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
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