https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 Dosimetry of ionising radiation in modern radiation oncology https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25064 in vivo dosimetry, brachytherapy and auditing of radiotherapy practice. Recent developments of dosimeters that can be used for these purposes are discussed using spatial resolution and number of dimensions for measurement as sorting criteria. While dosimetry is ever evolving to address the needs of advancing applications of radiation in medicine two fundamental issues remain: the accuracy of the measurement from a scientific perspective and the importance to link the measurement to a clinically relevant question. This review aims to provide an update on both of these.]]> Wed 24 Nov 2021 15:51:37 AEDT ]]> Complex optical elements for scanning helium microscopy through 3D printing https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47123 Wed 22 Mar 2023 19:02:39 AEDT ]]> The Sami Galaxy Survey: revisiting galaxy classification through high-order stellar kinematics https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34514 Rₑ) and ellipticity (ϵₑ) are used to separate fast and slow rotators; there exists a good correspondence to regular and non-regular rotators, respectively, as also seen in earlier studies. We confirm that regular rotators show a strong h₃ versus V/σ anti-correlation, whereas quasi-regular and non-regular rotators show a more vertical relation in h₃ and V/σ. Motivated by recent cosmological simulations, we develop an alternative approach to kinematically classify galaxies from their individual h₃ versus V/σ signatures. Within the SAMI Galaxy Survey, we identify five classes of high-order stellar kinematic signatures using Gaussian mixture models. Class 1 corresponds to slow rotators, whereas Classes 2-5 correspond to fast rotators. We find that galaxies with similar λRₑ - ϵₑ values can show distinctly different h₃ - V/σ signatures. Class 5 objects are previously unidentified fast rotators that show a weak h₃ versus V/σ anti-correlation. From simulations, these objects are predicted to be disk-less galaxies formed by gas-poor mergers. From morphological examination, however, there is evidence for large stellar disks. Instead, Class 5 objects are more likely disturbed galaxies, have counter-rotating bulges, or bars in edge-on galaxies. Finally, we interpret the strong anti-correlation in h₃ versus V/σ as evidence for disks in most fast rotators, suggesting a dearth of gas-poor mergers among fast rotators.]]> Wed 20 Mar 2019 13:17:45 AEDT ]]> Obtaining global equations for the Young's modulus of perfect and defective carbon nanotubes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32715 Wed 18 Jul 2018 16:19:36 AEST ]]> Spatially Separated Electron and Proton Beams in a Simulated Solar Coronal Jet https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39588 Wed 15 Jun 2022 12:47:02 AEST ]]> Biofabrication of advanced in vitro 3D models to study ischaemic and doxorubicin-induced myocardial damage https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47102 Wed 14 Dec 2022 09:51:28 AEDT ]]> 3D dose reconstruction: banding artefacts in cine mode EPID images during VMAT delivery https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17106 Wed 11 Apr 2018 17:01:24 AEST ]]> Comparison between the TRS-398 code of practice and the TG-51 dosimetry protocol for flattening filter free beams https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25165 Q calculations which show a much smaller difference between FFF and flattened beams than originally predicted. These results are explained by the inclusion of the added backscatter plates and build-up filters used in modern clinical FFF linacs, compared to a Monte Carlo model of an FFF linac in which the flattening filter is removed and no additional build-up or backscatter plate is added.]]> Wed 11 Apr 2018 16:42:22 AEST ]]> 3D EPID based dosimetry for pre-treatment verification of VMAT - methods and challenges https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17103 Wed 11 Apr 2018 15:30:09 AEST ]]> Automatic atlas based electron density and structure contouring for MRI-based prostate radiation therapy on the cloud https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17100 Wed 11 Apr 2018 15:17:45 AEST ]]> Elastic anomalies associated with structural and magnetic phase transitions in single crystal hexagonal YMnO₃ https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20853 c, consistent with λeQ²/s coupling. There is no change in dissipation associated with this high temperature transition, and no evidence in the elastic or anelastic behaviour for any secondary transition at ~920 K, thus supporting the thesis of a single high temperature transformation. Elastic stiffening is observed on cooling through TN, in accordance with previous studies, and the excess elastic constant appears to scale with the square of the magnetic order parameter. The strains incurred at TN are a factor of ~20 smaller than those at the structural transition, implying very weak λeQ²/m coupling and a dominant contribution to the variation in the elastic constants from λeQ²/m. The increased acoustic dissipation above TN is consistent with an order–disorder process.]]> Wed 11 Apr 2018 15:07:37 AEST ]]> An improved Monte-Carlo model of the varian EPID separating support arm and rear-housing backscatter https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17105 Wed 11 Apr 2018 14:38:42 AEST ]]> Ba termination of Ge(001) studied with STM https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26435 Wed 11 Apr 2018 14:07:26 AEST ]]> Audiovisual biofeedback improves image quality and reduces scan time for respiratory-gated 3D MRI https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17196 Wed 11 Apr 2018 13:31:39 AEST ]]> Development of a multi-wavelength photocurrent mapping system https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17002 Wed 11 Apr 2018 12:45:09 AEST ]]> Monte Carlo simulation of the transit dosimetric response of an a-Si electronic portal imaging device https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17163 98% of points passing a gamma analysis with 3%/3 mm criterion for all field sizes. The simulated anthropomorphic head phantom image shows macroscopic anatomical features and qualitatively agrees with the measured image. Results validate the suitability of the MC model for predicting EPID response in transit dosimetry.]]> Wed 11 Apr 2018 12:00:20 AEST ]]> Characterization of the radiation background at the Spallation Neutron Source https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29911 Wed 11 Apr 2018 09:48:16 AEST ]]> Reconnection-generated Plasma Flows in the Quasi-separatrix Layer in Localized Solar Corona https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:53719 Wed 10 Jan 2024 11:17:58 AEDT ]]> Spatial features of dose-surface maps from deformably-registered plans correlate with late gastrointestinal complications https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31828 Wed 09 Mar 2022 16:00:57 AEDT ]]> Validation of sea levels from coastal altimetry waveform retracking expert system: a case study around the Prince William Sound in Alaska https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34215 Wed 04 Sep 2019 12:18:12 AEST ]]> Is content or interest and enthusiasm of mathematics teachers more important? https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35576 Wed 04 Sep 2019 11:32:47 AEST ]]> Multi-Grid detector for neutron spectroscopy: results obtained on time-of-flight spectrometer CNCS https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34656 Wed 04 Sep 2019 09:49:38 AEST ]]> MALT90 kinematic distances to dense molecular clumps https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33990 Wed 04 Sep 2019 09:48:58 AEST ]]> Inversion of geophysical potential field data using the finite element method https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32482 Wed 04 Sep 2019 09:48:21 AEST ]]> Neutron detectors for the ESS diffractometers https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34554 Wed 04 Sep 2019 09:48:05 AEST ]]> Regression and statistical shape model based substitute CT generation for MRI alone external beam radiation therapy from standard clinical MRI sequences https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33939 Wed 02 Mar 2022 14:26:19 AEDT ]]> Localized surface plasmons in platinum aluminide semi-shells https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47828 Wed 01 Feb 2023 13:08:00 AEDT ]]> Mechanics and dynamics of lysozyme immobilisation inside nanotubes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47820 Wed 01 Feb 2023 10:33:49 AEDT ]]> Virtual EPID standard phantom audit (VESPA) for remote IMRT and VMAT credentialing https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34305 Tue 26 Feb 2019 15:18:09 AEDT ]]> Coronal Heating and Solar Wind Generation by Flux Cancellation Reconnection https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54371 Tue 20 Feb 2024 19:57:43 AEDT ]]> On the problem of non-zero word error rates for fixed-rate error correction codes in continuous variable quantum key distribution https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30491 Tue 20 Aug 2024 11:43:50 AEST ]]> Experimental Application of Bioclimatic Design Strategies for The Reduction of Cooling Energy Demand in Office Buildings In Tropical Hot-humid Climate https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52556 Tue 17 Oct 2023 15:34:22 AEDT ]]> Simulating the response of a small horizontal-axis wind turbine during wind gust using FAST https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46341 Tue 14 Nov 2023 14:55:52 AEDT ]]> Comment on 'Drought variability in the eastern Australia and New Zealand summer drought atlas (ANZDA, CE 1500-2012) modulated by the Interdecadal Pacific Oscillation' https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34752 Tue 03 Sep 2019 18:31:15 AEST ]]> A massive prestellar clump hosting no high-mass cores https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34083 ⊙), cold (12 K), and 3.6–70 μm IR dark clump (MM1) that has the potential to form high-mass stars. We observed this prestellar clump candidate with the Submillimeter Array (~3".5 resolution) and Jansky Very Large Array (~2farcs1 resolution) in order to characterize the early stages of high-mass star formation and to constrain theoretical models. Dust emission at 1.3 mm wavelength reveals five cores with masses ≤15 M. None of the cores currently have the mass reservoir to form a high-mass star in the prestellar phase. If the MM1 clump will ultimately form high-mass stars, its embedded cores must gather a significant amount of additional mass over time. No molecular outflows are detected in the CO (2-1) and SiO (5-4) transitions, suggesting that the SMA cores are starless. By using the NH₃ (1, 1) line, the velocity dispersion of the gas is determined to be transonic or mildly supersonic (ΔVnt/ΔVth ~ 1.1–1.8). The cores are not highly supersonic as some theories of high-mass star formation predict. The embedded cores are four to seven times more massive than the clump thermal Jeans mass and the most massive core (SMA1) is nine times less massive than the clump turbulent Jeans mass. These values indicate that neither thermal pressure nor turbulent pressure dominates the fragmentation of MM1. The low virial parameters of the cores (0.1–0.5) suggest that they are not in virial equilibrium, unless strong magnetic fields of ~1–2 mG are present. We discuss high-mass star formation scenarios in a context based on IRDC G028.23-00.19, a study case believed to represent the initial fragmentation of molecular clouds that will form high-mass stars.]]> Tue 03 Sep 2019 18:23:32 AEST ]]> Asymmetric line profiles in dense molecular clumps observed in MALT90: evidence for global collapse https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34944 + (1–0) line for the "blue asymmetry" spectroscopic signature of infall motion in a large sample of high-mass, dense molecular clumps observed to be at different evolutionary stages of star cluster formation according to their mid-infrared appearance. To quantify the degree of the line asymmetry, we measure the asymmetry parameter A=[formula could not be replicated], the fraction of the integrated intensity that lies to the blueshifted side of the systemic velocity determined from the optically thin tracer N₂H+ (1–0). For a sample of 1093 sources, both the mean and median of A are positive (A=0.0830 ± 010 and 0.065 ± 0.009, respectively) with high statistical significance, and a majority of sources (a fraction of 0.607 ± 0.015 of the sample) show positive values of A, indicating a preponderance of blue asymmetric profiles over red asymmetric profiles. Two other measures, the local slope of the line at the systemic velocity and the δv parameter of Mardones et al. (1997), also show an overall blue asymmetry for the sample, but with smaller statistical significance. This blue asymmetry indicates that these high-mass clumps are predominantly undergoing gravitational collapse. The blue asymmetry is larger (A ∼ 0.12) for the earliest evolutionary stages (quiescent, protostellar, and compact H ii region) than for the later H ii region (A ∼ 0.06) and photodissociation region (A ∼ 0) classifications.]]> Tue 03 Sep 2019 17:57:00 AEST ]]> Strategic planning towards a world-class university https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35015 Thu 30 May 2019 16:15:52 AEST ]]> Metal Single Atom Doped 2D Materials for Photocatalysis: Current Status and Future Perspectives https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50497 Thu 27 Jul 2023 10:50:34 AEST ]]> A variational model for conformation of graphene wrinkles formed on a shrinking solid metal substrate https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44459 Thu 13 Oct 2022 15:20:25 AEDT ]]> Fast automated segmentation of multiple objects via spatially weighted shape learning https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:29622 Thu 09 Dec 2021 11:02:48 AEDT ]]> Correlations between contouring similarity metrics and simulated treatment outcome for prostate radiotherapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43126 Thu 02 Nov 2023 13:16:15 AEDT ]]> Lattice sums arising from the Poisson equation https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12924 n(r₁,...,rn) = 1/π²[formula could not be replicated]. By virtue of striking connections with Jacobi ϑ-function values, we are able to develop new closed forms for certain values of the coordinates rk, and extend such analysis to similar lattice sums. A primary result is that for rational x, y, the natural potential ⏀²(x, y) is 1/π log A where A is an algebraic number. Various extensions and explicit evaluations are given. Such work is made possible by number-theoretical analysis, symbolic computation and experimental mathematics, including extensive numerical computations using up to 20,000-digit arithmetic.]]> Sat 24 Mar 2018 10:37:10 AEDT ]]> Optical properties and oxidation of alpha-phase Ag-Al thin films https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31514 Sat 24 Mar 2018 08:44:17 AEDT ]]> Momentum and scalar transport in a localised synthetic turbulence in a channel flow with a short contraction https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:15637 Sat 24 Mar 2018 08:23:45 AEDT ]]> A five-dimensional extension of general relativity and quantum theory https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:9936 Sat 24 Mar 2018 08:14:17 AEDT ]]> Reduction of the effect of non-uniform backscatter from an E-type support arm of a Varian a-Si EPID used for dosimetry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11188 Sat 24 Mar 2018 08:13:36 AEDT ]]> Key factors in determining the magnitude of vorticity in turbulent plane wakes https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11523 Sat 24 Mar 2018 08:10:22 AEDT ]]> Shear stiffness in nanolaminar Ti₃SiC₂ challenges ab initio calculations https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:10719 Sat 24 Mar 2018 08:09:48 AEDT ]]> An evaluation of cine-mode 3D portal image dosimetry for volumetric modulated arc therapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12124 Sat 24 Mar 2018 08:08:54 AEDT ]]> High-speed cycloid-scan atomic force microscopy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:11180 Sat 24 Mar 2018 08:08:26 AEDT ]]> Multiferroic (ferroelastic/ferromagnetic/ferrimagnetic) aspects of phase transitions in RCo₂ Laves phases https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20852 Sat 24 Mar 2018 08:02:54 AEDT ]]> A calibration technique to correct sensor drift issues in hot-wire anemometry https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18008 Sat 24 Mar 2018 07:56:16 AEDT ]]> First principles calculations of the optical and plasmonic response of Au alloys and intermetallic compounds https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19137 Sat 24 Mar 2018 07:55:54 AEDT ]]> Influence of alkyl chain length and anion species on ionic liquid structure at the graphite interface as a function of applied potential https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20589 Sat 24 Mar 2018 07:55:35 AEDT ]]> Elastic and anelastic relaxations accompanying magnetic ordering and spin-flop transitions in hematite, Fe2O3 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19730 TN = 946 ± 1 K is an example of a multiferroic transition which has both ferromagnetic (from canting of antiferromagnetically ordered spin moments) and ferroelastic (rhombohedral → monoclinic) character. By analogy with the improper ferroelastic transition in Pb₃(PO₄)₂, W and W' ferroelastic twin walls which are also 60° and 120° magnetic domain walls should develop. These have been tentatively identified from microstructures reported in the literature. The very low attenuation in the stability field of the C2/c structure in the polycrystalline sample used in the present study, in comparison with the strong acoustic dissipation reported for single crystal samples, implies, however, that the individual grains each consist of a single ferroelastic domain or that the twin walls are strongly pinned by grain boundaries. This absence of attenuation allows an intrinsic loss mechanism associated with the transition point to be seen and interpreted in terms of local coupling of shear strains with fluctuations which have relaxation times in the vicinity of ~10⁻⁸s. The first order [formula could not be replicated] (Morin) transition occurs through a temperature interval of coexisting phases but the absence of an acoustic loss peak suggests that the relaxation time for interface motion is short in comparison with the time scale of the applied stress (at ~0.1–1 MHz). Below the Morin transition a pattern of attenuation which resembles that seen below ferroelastic transitions has been found, even though the ideal low temperature structure cannot contain ferroelastic twins. This loss behavior is tentatively ascribed to the presence of local ferromagnetically ordered defect regions which are coupled locally to shear strains.]]> Sat 24 Mar 2018 07:53:45 AEDT ]]> An independent system for real-time dynamic multileaf collimation trajectory verification using EPID https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21332 Sat 24 Mar 2018 07:52:48 AEDT ]]> An improved density functional theory description of the Ge(100)c(4 x 2) surface using the MBJLDA xc potential and spin-orbit interactions https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20143 Sat 24 Mar 2018 07:51:36 AEDT ]]> A desktop supersonic free-jet beam source for a scanning helium microscope (SHeM) https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21548 19 atoms per second per steradian. The beam performance was investigated using a conventional ion gauge and a stagnation detector, with the latter being used to produce beam flux profiles. The profile of the macroskimmed beam has been experimentally demonstrated to be strongly Gaussian.]]> Sat 24 Mar 2018 07:50:25 AEDT ]]> Investigation of the sag in linac secondary collimator and MLC carriage during arc deliveries https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21546 Sat 24 Mar 2018 07:50:25 AEDT ]]> Finding the optimal statistical model to describe target motion during radiotherapy delivery - a Bayesian approach https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21551 Sat 24 Mar 2018 07:50:23 AEDT ]]> Dielectric function and its predicted effect on localized plasmon resonances of equiatomic Au-Cu https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:28067 Sat 24 Mar 2018 07:39:47 AEDT ]]> MRI simulation: end-to-end testing for prostate radiation therapy using geometric pelvic MRI phantoms https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27970 Sat 24 Mar 2018 07:38:43 AEDT ]]> Quantification of lung tumor rotation with automated landmark extraction using orthogonal cine MRI images https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26384 Sat 24 Mar 2018 07:33:05 AEDT ]]> Transit dosimetry in IMRT with an a-Si EPID in direct detection configuration https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:28541 Sat 24 Mar 2018 07:28:47 AEDT ]]> The effect of vacancies on the optical properties of AuAl₂ https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25899 Sat 24 Mar 2018 07:28:17 AEDT ]]> Calculating radiotherapy margins based on Bayesian modelling of patient specific random errors https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27483 Sat 24 Mar 2018 07:25:39 AEDT ]]> Insights into carbon nanotube and graphene formation mechanisms from molecular simulations: a review https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27721 Sat 24 Mar 2018 07:24:37 AEDT ]]> Anomalously strong plasmon resonances in aluminium bronze by modification of the electronic density-of-states https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25150 Sat 24 Mar 2018 07:17:09 AEDT ]]> A linear-quadratic order parameter coupling model for magnetoelastic phase transitions in Fe<sub>1-x</sub>O and MnO https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23365 1-xO, at the Néel temperature, T N∼195K, is treated in terms of coupling between two macroscopic order parameters related to separate discrete instabilities. These each couple with a rhombohedral shear strain to give an indirect mechanism of linear (structural)quadratic (magnetic) coupling between them. Based on patterns of lattice parameter and magnetic ordering data from the literature, it appears that the overall behaviour matches the general pattern of linear-quadratic coupling for a system with two rather similar instability temperatures. At low pressures, the magnetic instability occurs at a higher temperature than the structural instability but the coupling results in a single phase transition dominated by the influence of the magnetic order parameter. For Fe 0.99O the magnetic order parameter, m, varies with temperature as ∼m ⁸σ(T NT), while for Fe 0.94O the temperature dependence is of ∼m ⁴ or ∼m ². It is proposed that, with increasing pressure, there is a crossover of instability temperatures such that the structural instability occurs first at pressures above ∼13GPa. This would be expected to give rise to a first-order phase transition, as appears to occur, but magnetic ordering would still occur simultaneously if the coupling is sufficiently strong. Symmetry analysis and comparison with the behaviour of MnO shows that there are a number of different possible magnetically ordered structures which could be stabilized by pressure or non-hydrostatic stress to give topologically rich phase diagrams.]]> Sat 24 Mar 2018 07:16:30 AEDT ]]> Elastic and anelastic relaxations in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O₃: I. Strain analysis and a static order parameter https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23774 c ≈ 350 K. This matches the evolution of the intensity of the elastic central peak in neutron scattering spectra, and reflects the development of static (or quasistatic) polar nanoregions (PNRs) as if by a mean-field phase transition. Use of a Landau free energy expansion, which includes Γ̅₄ order parameter components to describe ferroelectric contributions and an R1(+) order parameter to describe cation ordering together with their formal coupling with strain, then allows the pattern of elastic softening expected for a cubic → rhombohedral phase transition to be anticipated. The extent to which observed softening differs from this static mean-field pattern serves to highlight the additional roles of local heterogeneity and relaxation dynamics in determining the relaxor properties of PMN.]]> Sat 24 Mar 2018 07:13:21 AEDT ]]> Motion prediction in MRI-guided radiotherapy based on interleaved orthogonal cine-MRI https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24544 Sat 24 Mar 2018 07:11:33 AEDT ]]> Enabling peristalsis of human colon tumor organoids on microfluidic chips https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49688 Mon 29 May 2023 11:08:53 AEST ]]> A C/V2O5 core-sheath nanofibrous cathode with mixed-ion intercalation for aluminium-ion batteries https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44893 Mon 24 Oct 2022 15:42:26 AEDT ]]> MRI-only treatment planning: benefits and challenges https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47471 Mon 23 Jan 2023 11:05:51 AEDT ]]> Arbitrary Lagrangian-Eulerian method for nonlinear problems of geomechanics https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12153 Mon 19 Aug 2024 10:32:19 AEST ]]> Volatile compounds in human breath: Critical review and meta-analysis https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47960 Mon 13 Feb 2023 14:42:01 AEDT ]]> 2.5D Magnetohydrodynamic Simulation of the Formation and Evolution of Plasmoids in Coronal Current Sheets https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55171 Mon 12 Aug 2024 08:13:22 AEST ]]> Electrostatic formation of Liquid Marbles - Statistical model https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49244 Mon 08 May 2023 10:21:31 AEST ]]> Glucose-6-phosphate induced changed of stomatal aperture in an irradiance dependent manner https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39209 Arabidopsis epidermal peel were detected with or without exogenous application of mannose, fructose, glucose, and glucose-6-phosphate (G-6P). The results here showed that G-6P, but not glucose itself, induces stomatal closure in Arabidopsis. Furthermore, detection of stomatal apertures of Arabidopsis hexokinase loss of function with exogenous application of glucose showed that glucose induced stomatal closure was not due to osmotic pressure and it triggered guard cell ROS production depend on hexokinase activity. The effect of irradiance and G-6P on regulation of Arabidopsis stomatal aperture was investigated. The data obtained here indicated that G-6P induced changes of stomatal aperture depend on irradiance.]]> Fri 27 May 2022 10:20:29 AEST ]]> Validation of a new open-source method for automatic delineation and dose assessment of the heart and LADCA in breast radiotherapy with simultaneous uncertainty estimation https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49482 Fri 19 May 2023 15:49:16 AEST ]]> Advanced Gouy phase high harmonics interferometer https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43414 Fri 16 Sep 2022 14:31:25 AEST ]]> Investigating the generalisation of an atlas-based synthetic-CT algorithm to another centre and MR scanner for prostate MR-only radiotherapy https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33736 1V) and without (sCT) a one voxel body contour expansion included in the algorithm. This was to test whether this expansion was required for 1.5 T images. Both synthetic CT's were rigidly registered to the planning CT (pCT). A 6 MV Volumetric Modulated Arc Therapy plan was created on the pCT and recalculated on the sCT and sCT1V The synthetic CT's dose distributions were compared to the dose distribution calculated on the pCT. The percentage dose difference at isocentre without the body contour expansion (sCT - pCT) was ΔDsCT = (0.9 ± 0.8) % and with (sCT1V-pCT) was ΔDsCT1V = (-0.7 ± 0.7) % (mean ± one standard deviation). The sCT1V; result was within one standard deviation of zero and agreed with the result reported previously using 3 T MR data. The sCT dose difference only agreed within two standard deviations. The mean ± one standard deviation gamma pass rate was ΓsCT = 96.1 ± 2.9% for the sCT and ΓsCT1V = 98.8 ± 0.5% for the sCT1V (with 2% global dose difference and 2 mm distance to agreement gamma criteria). The one voxel body contour expansion improves the synthetic CT accuracy for MR images acquired at 1.5 T but requires the MR voxel size to be similar to the atlas MR voxel size. This study suggests that the atlas-based algorithm can be generalised to MR data acquired using a different field strength at a different centre.]]> Fri 14 Dec 2018 14:42:04 AEDT ]]> Manipulating nanoscale structure to control functionality in printed organic photovoltaic, transistor and bioelectronic devices https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37227 Fri 11 Sep 2020 09:08:48 AEST ]]> Bulk scale fabrication of sodium tungsten bronze nanoparticles for applications in plasmonics https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43003 Fri 09 Sep 2022 14:10:35 AEST ]]> Automated EPID-based measurement of MLC leaf offset as a quality control tool https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42981 0.999. EDLG results were analyzed as a difference relative to a baseline EDLG measurement for each machine, a metric we labeled the leaf offset constancy (LOC). The maximum change in LOC out of the 20 repeatability tests was −0.094 mm. The LOC QC process was found to be capable (Cpk > 1) for 4 machines using a ± 0.15 mm specification limit. LOC results showed that leaves may deviate from their reference positions at a level that approaches dosimetric significance for small stereotactic and highly modulated treatment fields, with average excursions measuring up to 0.21 mm for a Millennium MLC and 0.16 mm for a HD MLC. The effects of initialization, gantry angle, and common repairs are also reported.]]> Fri 09 Sep 2022 13:56:28 AEST ]]> The evolution of rotation and magnetic activity in 94 Aqr Aa from asteroseismology with TESS https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37313 Fri 02 Oct 2020 11:44:12 AEST ]]>