A5087311228- Quantum, superfluid, helium dynamics
- Catalytic Processes in Materials Science
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Catalysis and Oxidation Reactions
- Catalysts for Methane Reforming
- Spacecraft Design and Technology
- Advanced Condensed Matter Physics
- High-pressure geophysics and materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Data Storage Technologies
- Advanced Optical Imaging Technologies
- Satellite Communication Systems
- Tactile and Sensory Interactions
- Engineering Applied Research
- CCD and CMOS Imaging Sensors
- Catalysis and Hydrodesulfurization Studies
- Fuel Cells and Related Materials
- Solar and Space Plasma Dynamics
- Electrocatalysts for Energy Conversion
- Structural Analysis and Optimization
- Cloud Computing and Resource Management
- Advanced Materials Characterization Techniques
The University of Melbourne
2024
Los Alamos National Laboratory
2023-2024
National High Magnetic Field Laboratory
2016-2024
Florida State University
2024
University of Florida
2023
Curtin University
2023
Lancaster University
2013-2022
Alliant Techsystems (United States)
2013
Abstract In most superconductors electrons form Cooper pairs in a spin-singlet state mediated by either phonons or long-range interactions such as spin fluctuations. The superconductor UTe 2 is rare material wherein are believed to unique spin-triplet with potential topological properties. While pairing may be ferromagnetic antiferromagnetic fluctuations, experimentally, the magnetic properties of unclear. By way muon rotation/relaxation (μSR) measurements on independently grown single...
We have measured the drag force from quantum turbulence on a series of quartz tuning forks in superfluid helium. The were custom made 75-$\ensuremath{\mu}$m-thick wafer. They identical prong widths and spacings, but different lengths to give resonant frequencies. used both fundamental overtone flexure modes probe turbulent over broad range frequencies $f=\ensuremath{\omega}/2\ensuremath{\pi}$ 6.5 300 kHz. Optical measurements show that velocity profiles are well described by cantilever beam...
Abstract The ground state of a fermionic condensate is well protected against perturbations in the presence an isotropic gap. Regions gap suppression, surfaces and vortex cores which host Andreev-bound states, seemingly lift that strict protection. Here we show superfluid 3 He role bound states more subtle: when macroscopic object moves at velocities exceeding Landau critical velocity, little to no bulk pair breaking takes place, while damping observed originates from covering moving object....
We report recent investigations into the transition to turbulence in superfluid $^{4}\mathrm{He}$, realized experimentally by measuring drag forces acting on two custom-made quartz tuning forks with fundamental resonances at 6.5 kHz and 55.5 kHz, temperature range 10 mK 2.17 K. In pure zero limit, three distinct critical velocities were observed both forks. discuss significance of all associate third velocity reported here development large vortical structures flow, which thus starts mimic...
We describe the development of a two-dimensional quasiparticle detector for use in visualising quantum turbulence superfluid $$^3$$ He-B at ultra-low temperatures. The consists $$5 \times 5$$ matrix pixels, each 1 mm diameter hole copper block containing miniature quartz tuning fork. damping on fork provides measure local flux. is illuminated by beam ballistic quasiparticles generated from nearby black-body radiator. A comparison different forks cross-sectional profile beam. Further, we...
A quantum spin liquid (QSL) is a state of matter characterized by fractionalized quasiparticle excitations, entanglement, and lack long-range magnetic order. However, QSLs have evaded definitive experimental observation. Several ${\mathrm{Yb}}^{3+}$-based triangular lattice antiferromagnets with effective $S=\frac{1}{2}$ been suggested to stabilize the QSL as ground state. Here, we build comprehensive temperature phase diagram high-quality single crystalline ${\mathrm{KYbSe}}_{2}$ via heat...
Turbulence remains one of the last unsolved problems classical physics. Here, authors present insights from nucleation and evolution simpler quantum turbulence. They generate turbulence mechanically, image dynamics nondestructively through illumination thermal quasiparticles. At low temperatures, ballistic quasiparticles are Andreev-reflected by vortex flow fields, producing a shadow which shows that tangle is asymmetrical. This suggests rings - precursors unevenly created generator.
We present the first measurements of response a mechanical oscillator in solid 4He. use lithium niobate tuning fork operating its fundamental resonance mode at frequency around 30 kHz. Measurements 4He were performed close to melting pressure. The shows substantial shifts on cooling from 1.5 K below 10 mK. an abrupt change bcc-hcp transition. At low temperatures, 100 mK, splits into several overlapping resonances.
This study identifies and analyzes the effect that aging time temperature have on CO light‐off activity of three‐way catalyst samples, aged in a static air (oxidizing) atmosphere. The bench (BAT) equation proposed by Environmental Protection Agency (EPA), which describes as dependent upon at temperature, was used to calculate range oven times temperatures based RAT‐A engine cycle. tests carried out cores between 800 900 °C shown it is has greatest deterioration for testing, with having...
We present measurements of a thin wire moving through solid 4He. Measurements were made over wide temperature range at pressures close to the melting curve. describe new experimental technique and preliminary relatively high driving forces (stresses) velocities (strain rates). The moves by plastic deformation surrounding facilitated quantum tunneling vacancies motion defects. In bcc phase we observe very pronounced viscoelastic effects with relaxation times spanning several orders magnitude....
This study identifies, and analyses, the correlation that exists in CO light-off performance of full size canned catalytic converters cored samples taken from front rear sections same catalyst brick. Testing was conducted under laboratory conditions, with tested using Catagen Labcat, testing Horiba SIGU 2000. From experimental tests alone, there no clear between activities samples. However, by performing simulations QUB global model, which accounts for variation precious metal dispersion...
Artificial intelligence (AI) and autonomous edge computing in space are emerging areas of interest to augment capabilities nanosatellites, where modern sensors generate orders magnitude more data than can typically be transmitted mission control. Here, we present the hardware software design an onboard AI subsystem hosted on SpIRIT. The system is optimised for on-board computer vision experiments based visible light long wave infrared cameras. This paper highlights key choices made maximise...
The Thermal Management Integrated System (TheMIS) is a key element of the Australia-Italy Space Industry Responsive Intelligent (SpIRIT) mission, launched in 510km Polar Sun-Synchronous orbit December 2023. SpIRIT 6U CubeSat led by University Melbourne cooperation with ASI, support from ASA and contributions Australian space industry international research organizations. TheMIS subsystem actively cools controls temperature sensitive instruments, increasing potential range payloads supported...
There is a growing demand for experiments on calorimetric and thermal transport measurements at ultra-low temperatures below 1 mK high magnetic fields up to 16 T. Particularly, milligram-sized solid samples are of great interest. We present the development scalable thermometers based quartz tuning fork resonators immersed in liquid 3He adapt hydrodynamic models provide an improved description temperature dependence viscosity regime between 10mK. demonstrate successful thermometer operation...