Wanderings in South America &amp;c

Waterton, Charles

doi:10.5962/bhl.title.47078

Cited by 7 publications

(9 citation statements)

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Section: Introductionmentioning

confidence: 88%

“…(4) and obtained the relation earlier introduced empirically by Waterton 39 in 1932. The application of the Waterton-Mauro equation (WM), 38,39 showed its superior fitting quality in comparison to VFT and AB parameterizations. It is noteworthy that the WM equation does not exhibit a finite temperature singularity below T g , which is the key feature of the VFT relation, 23,40 underlying the "Stickel linearization.…”

Section: Introductionmentioning

confidence: 88%

“…5,25,38,39 Particularly, noteworthy seems to be the Waterton-Mauro (MW) equation 38,39 which validity has been regained recently: 23,38,40 …”

Section: Apparent Activation Enthalpyanalysismentioning

confidence: 99%

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The new insight into dynamic crossover in glass forming liquids from the apparent enthalpy analysis

García

Martinez-Garcia

Rzoska

et al. 2012

The Journal of Chemical Physics

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Dynamics of glass-forming liquids. V. On the link between molecular dynamics and configurational entropy The Journal of Chemical Physics 108, 9016 (1998) (2011)]. We present a qualitatively new way to identify the dynamic crossover based on the apparent enthalpy space (H a = d ln τ /d(1/T )) analysis via a new plot ln H a vs. 1/T supported by the Savitzky-Golay filtering procedure for getting an insight into the noise-distorted high order derivatives. It is shown that depending on the ratio between the "virtual" fragility in the high temperature dynamic domain (m high ) and the "real" fragility at T g (the low temperature dynamic domain, m = m low ) glass formers can be splitted into two groups related to f < 1 and f > 1, (f = m high /m low ). The link of this phenomenon to the ratio between the apparent enthalpy and activation energy as well as the behavior of the configurational entropy is indicated.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 88%

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The new insight into dynamic crossover in glass forming liquids from the apparent enthalpy analysis

García

Martinez-Garcia

Rzoska

et al. 2012

The Journal of Chemical Physics

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“…1 DCE-MRI provides quantitative measurement of vascular disruption associated with synovitis( 2,3 and has been shown to be sensitive to early treatment-induced changes in small group sizes in multicentre trials(. 4 Objectives: 1. Determine the reproducibility of DCE-MRI parameters in the knee.…”

mentioning

confidence: 99%

“…K trans had CoVs of 26/16% in OA patients/controls. An effect size of 30% reduction in K trans (, 4 indicates a treatment effect would be observed in a group of 11 patients with 90% power. DCE parameters were generally higher in OA patients than in controls.…”

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confidence: 99%

AB1186 Dynamic contrast enhanced mr imaging in early stage knee osteoarthritis: a test-retest repeatability study in healthy and moderately diseased subjects

Nezhad

Mackay²,

Kaggie³

et al. 2018

Diagnostics and Imaging Procedures

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BackgroundOsteoarthritis(OA)in the knee exhibits signs of synovial activation in early phase of disease(.1 DCE-MRI provides quantitative measurement of vascular disruption associated with synovitis(2,3and has been shown to be sensitive to early treatment-induced changes in small group sizes in multicentre trials(.4 Objectives1. Determine the reproducibility of DCE-MRI parameters in the knee.2. Compare DCE-MRI parameters between participants with mild/moderate OA and aged matched controls.3. Enable effect and sample size calculations for further studies.Methods9 knee OA patients and 4 controls underwent two MRI scans with a month separation. All patients had diagnosis of knee OA as per ACR criteria, with medial compartment predominant disease and Kellgren-Lawrence grade 2/3 on radiographs. 3 pre-contrast injection series were obtained with flip angles 2o,6o and 14ofor T1 calculation.35 consecutive phases formed the DCE-MRI series(temporal resolution:14 s). Contrast agent(CA)(Dotarem(0.4 mL/kg))was administrated on the 6th phase at the rate 3 mL/s followed by 50 mL saline. All Images were registered together. Here 2 DCE paramaters are reported:Ktrans(min-1), volume transfer constant for CA between blood plasma and extravascular extracellular space; estimated using the extended Tofts model(5 with population arterial function(;6 and IAUC60(mM.s), initial area under CA concentration curve over 60 s post-arrival. Manual segmentation was performed by radiologist.ResultsTest-retest coefficient of variation(CoV) was lower in controls. Ktranshad CoVs of 26/16% in OA patients/controls. An effect size of 30% reduction in Ktrans(,4 indicates a treatment effect would be observed in a group of 11 patients with 90% power. DCE parameters were generally higher in OA patients than in controls. 4 out of 9 patients (All with KL score 3)demonstrated parameter values outside the healthy volunteer range at p<0.01 level (one sample t-test).Abstract AB1186 – Table 1Age(mean±SD)BMI(mean±SD)#KL-grade 2/3#MOAKS effusion synovitis grade 0/1/2#MOAKS Hoffa synovitis grad 0/1 Patient (n=9, 4F)52±5.230±4.155/45/1/37/2control (n=4, 3F)55±3.030±3.50NA3/1/03/1Abstract AB1186 – Figure 1ConclusionsHigher Ktransand IAUC60in patients indicates the potential of revealing microvascular function differences. The fact that this is not observed in all patients could suggest phenotypical variation. High CoV values in patient relative to healthy may be explained in part by fluctuation in disease status. Manual delineation also contributes to this variation.DCE-MRI measures of vascular disruption associated with synovitis in knee OA are practical and feasible for imaging trials. These measures offer greater insight and sensitivity into the inflammatory component of OA that is not captured using other radiological methods.References[1] Roemer, et al. Osteoarthr Cartil.2010;1269–74.[2] Wenham, et al. Osteoarthr Cartil.2014; 1614–18.[3] Gait, et al. Osteoarthr. Cartil2016;1392–8.[4] Waterton, et al. Eu. Rad2017;3662–8.[5] Tofts, et al. JMRI.1999;223–32.[6] Parker, ...

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Insight into the dynamics of low temperature dielectric relaxation of ordinary perovskite ferroelectrics

et al. 2017

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The temperature dependence of the dielectric response of ordinary ferroelectric materials exhibits a frequency-independent anomalous peak as a manifestation of the ferroelectric to paraelectric phase transition. A second anomaly in the permittivity has been reported in different ferroelectric perovskite-type systems at low temperatures, often at cryogenic temperatures. This anomaly manifests as a frequency-dependent local maximum, which exhibits similar characteristics to that observed in relaxor ferroelectrics around their phase transition. The origin of this unexpected behavior is still controversial. In order to clarify this phenomenon, a model-free route solution is developed in this work. Our findings reveal the same critical linear pattern/glass-like freezing behavior previously observed for glass-forming systems. Contrary to current thought, our results suggest that a critical-like dynamic parameterization could provide a more appropriate solution than the conventional Vogel-Fulcher-Tammann equation. The implemented methodology may open a new pathway for analyzing relaxation phenomena in other functional materials like relaxor ferroics.

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Wanderings in South America &c

Cited by 7 publications

References 0 publications

The new insight into dynamic crossover in glass forming liquids from the apparent enthalpy analysis

The new insight into dynamic crossover in glass forming liquids from the apparent enthalpy analysis

AB1186 Dynamic contrast enhanced mr imaging in early stage knee osteoarthritis: a test-retest repeatability study in healthy and moderately diseased subjects

Insight into the dynamics of low temperature dielectric relaxation of ordinary perovskite ferroelectrics

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