A5026046029- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Optical Imaging Technologies
- Crystallography and molecular interactions
- Geological and Geochemical Analysis
- Planetary Science and Exploration
- Advanced Fiber Laser Technologies
- Lanthanide and Transition Metal Complexes
- Astro and Planetary Science
- Photorefractive and Nonlinear Optics
- Digital Holography and Microscopy
- Geology and Paleoclimatology Research
- Trace Elements in Health
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Photonic and Optical Devices
- Advanced X-ray and CT Imaging
- Calibration and Measurement Techniques
- Interactive and Immersive Displays
- Laser-Plasma Interactions and Diagnostics
- earthquake and tectonic studies
- Geochemistry and Elemental Analysis
Queensland University of Technology
2011-2025
Oak Ridge National Laboratory
2025
Georgia Southern University
2022-2024
Children's Hospital at Westmead
2016-2023
UK Power Networks
2023
Toyota Research Institute
2022
Nevada National Security Site
2021
Sandia National Laboratories
2008-2021
Institute for the Future
2019-2020
Brisbane School of Theology
2018-2020
The geological units on the floor of Jezero crater, Mars, are part a wider regional stratigraphy olivine-rich rocks, which extends well beyond crater. We investigated petrology olivine and carbonate-bearing rocks Séítah formation in Jezero. Using multispectral images x-ray fluorescence data, acquired by Perseverance rover, we performed petrographic analysis Bastide Brac outcrops within this unit. found that these composed igneous rock, moderately altered aqueous fluid. mainly made...
The design and fabrication of a micropolarizer array for imaging polarimetry is described the 3–5-µm-wavelength region. Each consists 475-nm-period Mo wire grid in 16 µm×16 µm aperture. Interference lithography used to generate small grating features through an etch mask layer. Arrays 256×256 micropolarizers at three distinct angular orientations have been fabricated that permit measurement first Stokes vector components each pixel polarimeter. An system composed integrated directly onto...
Accurate tuning sulfur vacancy of NiCo<sub>2</sub>S<sub>4</sub> nanoparticles enabled by plasma treatment provides a novel and efficient approach to enhance electrochemical performance supercapattery.
Collocated crystal sizes and mineral identities are critical for interpreting textural relationships in rocks testing geological hypotheses, but it has been previously impossible to unambiguously constrain these properties using situ instruments on Mars rovers. Here, we demonstrate that diffracted fluoresced x-rays detected by the PIXL instrument (an x-ray fluorescence microscope Perseverance rover) provide information about presence or absence of coherent crystalline domains various...
Double electron–electron resonance (DEER) spectroscopy can determine, from measurement of the dipolar interaction, distance and orientation between two paramagnetic centres in systems lacking long-range order such as powders or frozen solution samples. In spin with considerable anisotropy, microwave pulses excite only a fraction electron (EPR) spectrum resulting selection needs to be explicitly taken into account if meaningful is determined. Here, general method presented analyze interaction...
A flexible, modular ynamide synthesis is reported that uses trichloroethene as an inexpensive two carbon synthon. wide range of amides and electrophiles can be converted to the corresponding ynamides, importantly including acyclic carbamates, hindered amides, aryl amides. This method thus overcomes many limitations other approaches this useful functionality.
In-situ chemical analysis on thin sections is a cornerstone of geochemical research. Despite massive advances in digital image analysis, the interpretation such data within optical petrological context section has largely remained an analogue task geochemistry. In this contribution, we registered and micro-chemical images from large areas. Chemical datasets scanning electron microscopy energy dispersive spectrometry (SEM-EDX) Synchrotron X-ray fluorescence (S-XFM) were exported proprietary...
Analysis of orientation-selective DEER measurements using Cu(<sc>ii</sc>) centres in a series molecules demonstrates its limits and capabilities structure elucidation.
Analytical approaches that preserve the endogenous state of examined system are essential for in vivo study bioinorganics. X-ray fluorescence microscopy biological samples can map elements at subcellular resolutions tissue and multicellular organisms. However, irradiation induces modifications accumulate with dose. Consequently, utility is intrinsically limited by radiation damage it causes degree to which alters target features interest. Identification dose threshold, below integrity...
Abstract The Havre 2012 deep-sea rhyolite eruption went unobserved and was initially recognised from a massive pumice raft at the sea surface. pumices are predominantly white or grey, however pink is common in raft. In subaerial explosive eruptions, understood to result high-temperature atmospheric iron-oxidation. presence of questions effusive model for Here we report results X-ray Absorption Near Edge Structure spectroscopy, magnetic measurements, TEM imaging glass chemistry that...
We present a synthesis of PIXL elemental data and SHERLOC Raman spectra collected on two targets investigated by the Perseverance rover during first year its exploration Jezero Crater, Mars. The Bellegarde target (in Máaz formation) Dourbes Séítah exhibit distinctive mineralogies that are an ideal case study for in situ analysis PIXL. Each instrument alone produces valuable about chemistry spatial distribution mineral phases at sub-millimeter scale. However, combining from both instruments...
The Jezero crater floor features a suite of related, iron-rich lavas that were examined and sampled by the Mars 2020 rover Perseverance, whose textures, minerals, compositions characterized Planetary Instrument for X-ray Lithochemistry (PIXL). This suite, known as Máaz formation (fm), includes dark-toned basaltic/trachy-basaltic rocks with intergrown pyroxene, plagioclase feldspar, altered olivine overlying trachy-andesitic lava reversely zoned phenocrysts in K-rich groundmass. Feldspar...
Abstract The Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment has operated five whole‐ecosystem warming manipulations (+0, +2.25, +4.5, +6.75, +9°C) with paired ambient elevated CO 2 atmospheres (eCO , +500 ppm) for 8 full calendar years (since August 2015). We tracked shrub‐layer vegetation responses to the treatments using annual destructive plot sampling. Tree ( Picea Larix ) were assessed annually nondestructive dimensional analyses allometric conversions....
During the interseismic phase, faults regain frictional strength through a process commonly referred to as fault healing. Key mechanisms include contact welding by dissolution-precipitation creep and cementation mineral precipitation in fluid-rich environments. While much research has focused on experimental investigations of silicate systems, e.g. slide-hold-slide experiments, complex interaction between mechanical chemical processes, well recurring healing over multiple earthquake cycles...
Mylonitic shear zones funnel significant amounts of fluids through the crust. However, physical mechanisms and pathways for mass transfer remain debated. Grain boundaries, creep cavities, pores formed by mineral reactions involving volume change transport are considered most important fluid conduits. So far, imaging these was either limited to &#181;m-resolution, or in case nm-scale resolution, very small areas (e.g., TEM investigates regions &#181;m2-range) with statistical power....
In traumatic brain injury (TBI), neurons surviving the primary insult may succumb through poorly understood secondary mechanisms. vitro , cortical exposed to stretch exhibited enhanced vulnerability NMDA, apoptotic-like DNA fragmentation, peroxynitrite (PN) formation, and cytoplasmic cytochrome c accumulation. Surprisingly, caspase-3 activity was undetectable by both immunoblotting fluorogenic assays. Therefore, we hypothesized that PN directly inhibits caspases in these neurons. Consistent...
Electron transfer (ET) rate kinetics through n-alkanethiol self-assembled monolayers (SAMs) of alkanethiols different chain lengths [Me(CH2)nSH; n = 8, 10, 11, 15] on Au and Hg surfaces ferrocene (Fc)-terminated SAMs (poly-norbornylogous HS(CH2)12CONHCH2Fc) were studied using cyclic voltammetry scanning electrochemical microscopy (SECM). The SECM results allow determination the ET solution-phase Ru(NH3)63+/2+ alkanethiol Hg. A model potential dependence measured constants is proposed to...
New fluorescent and biocompatible aromatic Ga(III)- In(III)-bis(thiosemicarbazonato) complexes for dual mode optical PET or SPECT molecular imaging have been synthesised via a synthetic method based on transmetallation reactions from Zn(II) precursors. Complexes fully characterised in the solid state by single crystal X-ray diffraction solution spectroscopic methods (UV/Vis, fluorescence, (1)H (13)C{(1)H} NMR). The bis(thiosemicarbazones) radiolabelled rapidly high yields under mild...
Lanthanide appended rotaxanes have been prepared by the CuAAC 'click' reaction between an azide rotaxane and lanthanide complexes of propargyl DO3A. The resulting are luminescent, exhibit chloride responsive luminescence behavior consistent with existence two independent halide binding pockets, one in cavity on ninth (axial) coordination site lanthanide. Strong to europium gives rise changes relative intensity hypersensitive ΔJ = 2 transition compared rest emission spectrum, combined...
Abstract Background and Aims X-ray fluorescence microscopy (XFM) is a powerful technique to elucidate the distribution of elements within plants. However, accumulated radiation exposure during analysis can lead structural damage experimental artefacts including elemental redistribution. To date, acceptable dose limits have not been systematically established for hydrated plant specimens. Methods Here we explore rate investigating fresh sunflower (Helianthus annuus) leaf root samples...
Objective Damage to locus ceruleus neurons could play a part in the pathogenesis of neurodegenerative disorders such as Alzheimer's disease, Parkinson's and multiple sclerosis because impairment blood-brain barrier enhanced neuroinflammation. The has connections throughout brain spinal cord, so characteristic widespread multifocal pathology these be due damage different subsets neurons. Previous studies have shown that only certain accumulate neurotoxic metal mercury. To find out if...
The results of the effects a solar eclipse magnitude 0.88 at Huancayo, Peru, on various components E ‐, F 1‐, and 2‐layers ionosphere are described. Minima in ion‐density were observed for ‐ 1‐layers near time maximum eclipse. A delayed effect decrease 2‐layer was observed. An ion‐density, which may be attributed to corpuscular eclipse, is (Other suggestions regarding this given separate report by H. W. Wells A. Shapley.) signal‐intensity variations, WWV, also noted.