A5024843958- Graphene research and applications
- Molecular Junctions and Nanostructures
- Diamond and Carbon-based Materials Research
- Advanced Chemical Physics Studies
- 2D Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Mass Spectrometry Techniques and Applications
- Animal Nutrition and Physiology
- Semiconductor materials and devices
- Machine Learning in Materials Science
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Atomic and Molecular Physics
- Boron and Carbon Nanomaterials Research
- Advanced Fiber Laser Technologies
- Electron and X-Ray Spectroscopy Techniques
- Electronic and Structural Properties of Oxides
- Surface Chemistry and Catalysis
- Innovative Teaching and Learning Methods
- Quantum and electron transport phenomena
- Surface and Thin Film Phenomena
- Science Education and Pedagogy
- Electrocatalysts for Energy Conversion
- Ion-surface interactions and analysis
- Electrochemical Analysis and Applications
University of Kentucky
2007-2025
NOAA National Environmental Satellite Data and Information Service
2025
The University of Adelaide
2025
The University of Western Australia
1990-2025
University of Technology Sydney
2013-2023
Lawrence Livermore National Laboratory
2023
AstraZeneca (United Kingdom)
2021-2022
Carbon Solutions (United States)
2022
Columbia University
1948-2021
AstraZeneca (Brazil)
2021
Hexagonal boron nitride (hBN) is an emerging two-dimensional material for quantum photonics owing to its large bandgap and hyperbolic properties. Here we report two approaches engineering emitters in hBN multilayers using either electron beam irradiation or annealing characterize their photophysical The defects exhibit a broad range of multicolor room-temperature single photon emissions across the visible near-infrared spectral ranges, narrow line widths sub-10 nm at room temperature, short...
Abstract This article explores the relation between how scientific knowledge is created and reasoning involved in learning content with understanding. Although an asserted parallel these underpins reform, little actually known about this relation. offers a model of that draws coherent connections science studies literature, which suggests ways conceiving created; sociocultural theory, reasoning. highlights dialectic construction critique claims both practice. A “grasp” practice as such...
Two-dimensional van der Waals materials have emerged as promising platforms for solid-state quantum information processing devices with unusual potential heterogeneous assembly. Recently, bright and photostable single photon emitters were reported from atomic defects in layered hexagonal boron nitride (hBN), but controlling inhomogeneous spectral distribution reducing multi-photon emission presented open challenges. Here, we demonstrate that strain control allows tunability of hBN over 6...
Don't Ape Protein Variation Changes in DNA and messenger RNA (mRNA) expression levels have been used to estimate evolutionary changes between species. However protein may better reflect selection on divergent constrained phenotypes. Khan et al. (p. 1100 , published online 17 October; see the Perspective by Vogel ) measured differences among within species mRNA humans, chimpanzees, rhesus macaques, identifying transcripts that seem be under lineage-specific constraint humans chimpanzees.
Hexagonal boron nitride (hBN) has recently emerged as a fascinating platform for room-temperature quantum photonics due to the discovery of robust visible light single-photon emitters. In order utilize these emitters, it is necessary have clear understanding their atomic structure and associated excitation processes that give rise this single photon emission. Here, we performed density-functional theory (DFT) constrained DFT calculations range hBN point defects in identify potential emission...
Key properties of nine possible defect sites in hexagonal boron nitride (h-BN) are predicted using density-functional theory and corrected by applying results from high-level ab initio calculations. Observed h-BN electron-paramagnetic resonance signals at 22.4, 20.83, 352.70 MHz assigned to VN, CN, VNO2B, respectively, while the observed photoemission 1.95 eV is VNCB. Detailed consideration available excited states, allowed spin-orbit couplings, zero-field splitting, optical transitions made...
Desorption electrospray ionization (DESI) was demonstrated as a means to couple thin-layer chromatography (TLC) with mass spectrometry. The experimental setup and its optimization are described. Development lanes were scanned by moving the TLC plate under computer control while directing stationary DESI emitter charged droplet plume at surface. Mass spectral data recorded in either selected reaction monitoring mode or full scan ion trap using hybrid triple quadrupole linear spectrometer....
The optical absorption efficiency of nanospheres and nanoshells the elements Na, K, Al, Ag, Au are compared, effects surface scattering, as introduced by billiard model [Moroz, A. J. Phys. Chem. C 2008, 112 (29), 10641−10652] discussed. We find that introduction scattering has comparatively little effect on optimized nanospheres, with maximum K falling from 14.7 to 13.3. Conversely, reduction in is substantial. This compounded metals higher plasma frequency. show high comparative frequencies...
This article identifies aspects of argumentation in scientific practice that are key for sense-making and articulates how engagement these happens both inter-mentally (between people) intra-mentally (an individual's reasoning). Institutionally, peer review exerts critique on new knowledge claims science is comprised by a search errors, which can be expressed as generation evaluation alternative possibilities contrast with the claim. Critique influences construction claims, this interplay...
Faceted crystals with exposed highly reactive planes have attracted intensive investigations for applications such as hydrogen production, enhanced catalytic activity, and electrochemical energy storage conversion. Herein, we report the synthesis of mesoporous NiO dominantly {110} facets by thermal conversion hexagonal Ni(OH)(2) nanoplatelets. When applied anode materials in lithium-ion batteries, exhibit a high reversible lithium capacity 700 mAh g(-1) at 1 C rate 100 cycles an excellent...
The cause of intractable chronic diarrhoea was found to be malabsorption bile acid in five out 42 patients thought have the irritable bowel syndrome, six 29 with persistent after surgery for peptic ulcer, 23 who had undergone small resection, and two others. Specific treatment brought symptomatic relief. diagnosis established by measuring proportion SeHCAT, a synthetic salt, retained one week oral administration tracer dose less than 100 micrograms compound labelled 40 kBq (1 microCi)...
Realization of quantum information and communications technologies requires robust, stable solid-state single-photon sources. However, most existing sources cease to function above cryogenic or room temperature due thermal ionization strong phonon coupling, which impedes their emissive properties. Here we present an efficient source based on a defect in van der Waals crystal that is optically operates at elevated temperatures up 800 K. The nature the photon purity are maintained upon heating...
ESR Endangered Species Research Contact the journal Facebook (Twitter) RSS Mailing List Receive regular lists of newly published articles via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 11:69-82 (2010) - DOI: https://doi.org/10.3354/esr00263 and stock identification prey consumed by endangered southern resident killer whales in their summer range M. Bradley Hanson1,*, Robin W. Baird2, John K. B. Ford3, Jennifer Hempelmann-Halos1, Donald Van Doornik4, R. Candy3, Candice Emmons1,...
Ar plasma etching and annealing are highly robust in generating oxygen related single photon emitters hBN.
The synthetic chemistry and spectroscopy of sulfur-protected gold surfaces nanoparticles is analyzed, indicating that the electronic structure interface Au(0)-thiyl, with Au(I)-thiolates identified as high-energy excited surface states. Density-functional theory indicates it noble character nanoparticle destabilizes Au(I)-thiolates. Bonding results from large van der Waals forces, influenced by covalent bonding induced through s-d hybridization charge polarization effects perturbatively mix...
Abstract This article draws on M. Bakhtin's (1981) notion of dialogism to articulate what it means understand a scientific idea. In science, understanding an idea is both conceptual and epistemic exhibited by ability use in explanation argumentation. Some distillation these activities implies that dialogic includes being able explain natural phenomena, aware one among multiplicity alternatives, the superior alternatives based upon evaluation which involves relating evidence. related here...
Structural stability and hydrogen adsorption capacity are two key quantities in evaluating the potential of metal-adatom decorated graphene for storage related devices. We have carried out extensive density functional theory calculations molecules on 12 different adatom (Ag, Au, Ca, Li, Mg, Pd, Pt, Sc, Sr, Ti, Y, Zr) surfaces where adatoms found to be stabilized double carbon vacancies, thus overcoming ``clustering problem'' that occurs pristine graphene. Ca Sr predicted bind greatest...
In 2012, Bjorkman et al. posed the question "Are we van der Waals ready?" [J. Phys.: Condens. Matter, 24, 424218] about ability of ab initio modelling to reproduce (vdW) dispersion forces in layered materials. The answer at that time was no, however. Here report on a new generation vdW models and show one, fractionally-ionic atom (FIA) theory, offers close quantitative predictions for structures. Furthermore, it does so from qualitatively correct picture forces. Other methods, such as D3...