Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic‐martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings ...against high‐temperature corrosion induced by potassium chloride (KCl) was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. In addition, a salt‐free experiment was performed for comparison. Microstructure, chemical and phase composition of the samples were analyzed with scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDS) and X‐ray diffractometry (XRD) before and after the exposures. It was found that all the diffusion coatings formed protective oxides under salt‐free exposure in air. Under the salt deposit, Fe1−xAl showed local failure while on large parts of the sample a protective layer had formed. Fe2Al5 was attacked over the entire surface and the dominant mode of attack was selective aluminum removal. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.
Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic‐martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings against high temperature corrosion induced by KCl was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.
The transformation of austenite to martensite in an Al-Mn-Si transformation-induced plasticity steel was investigated with in situ electron backscatter diffraction (EBSD) measurements under tensile ...straining. The visualisation of the microstructure upon straining allows for an investigation of the stability of austenite grains against strain-induced transformation, with particular focus on the grain size and the location of the austenite grains. The findings confirm that size and location of austenite grains are significant parameters for their stability. Small austenite grains were observed to be more stable than large grains, while austenite grains located beside bainitic ferrite are the most stable. Moreover, it is demonstrated that austenite grains transform gradually.
Oxidation of 99·99% pure nickel was studied with and without 0·10 mg cm
−2
KCl(s) in an environment containing 5 vol.-%O
2
, 40 vol.-%H
2
O and 55 vol.-%N
2
at 600°C for up to 168 h. Oxide ...microstructure was investigated by X-ray diffraction (XRD), focused ion beam (FIB), broad ion beam (BIB) and SEM/EDX. Oxidised nickel shows an approximately parabolic oxide growth rate. The oxide scale is dense with some pores at the oxide/metal interface. Adding small amounts of KCl does not result in a faster corrosion rate of nickel. However, the surface morphology changes and small oxide crusts were observed in the vicinity of former KCl particles. This is proposed to be the result of a NiCl
2
-KCl eutectic on top of the oxide scale formed above 514°C. The oxide scale formed in the presence of KCl contains more and differently distributed voids than the scale formed without KCl.
Oxidation of Ni
2
Al
3
produced by pack aluminizing of pure nickel was studied with and without 0.10 mg cm
−2
KCl(s) deposit in an environment containing 5% O
2
, 40% H
2
O and 55% N
2
at 600 °C for ...up to 168 h. Oxide microstructure and composition was investigated by SEM/EDX, BIB, TEM and GDOES. Oxidised Ni
2
Al
3
shows minimal weight gain, while adding KCl results in a small weight loss consistent with evaporation of KCl. On the surface of samples exposed to the gas environment only, a 30 nm oxide of Al oxide was present, but where KCl was present as deposit, 50-250 nm thick nodules form that are enriched in K, O and Al.
Oxidation of Ni2Al3 produced by pack aluminizing of pure nickel was studied with and without 0.10 mg cm(-2) KCl(s) deposit in an environment containing 5% O-2, 40% H2O and 55% N-2 at 600 degrees C ...for up to 168 h. Oxide microstructure and composition was investigated by SEM/EDX, BIB, TEM and GDOES. Oxidised Ni2Al3 shows minimal weight gain, while adding KCl results in a small weight loss consistent with evaporation of KCl. On the surface of samples exposed to the gas environment only, a 30 nm oxide of Al oxide was present, but where KCl was present as deposit, 50-250 nm thick nodules form that are enriched in K, O and Al.
Chordae tendineae may be instrumental for valvular-ventricular interaction, i.e. the reciprocal exchange of force between the left ventricular myocardium and the mitral apparatus. Chordae tendineae ...are divided into primary leading edge chordae and secondary belly chordae, and differences in thickness and distribution may reflect different functions of the two types. Primary chordae may be fundamental for leading edge control and for correct leaflet coaptation, while secondary chordae may act as the main mediators of valvular-ventricular interaction. It was postulated that tension in secondary chordae of the anterior leaflet is greater than in the primary chordae. The study aim was to investigate the distribution of chordae tendineae tension in the porcine mitral valve in vivo.
During extracorporeal bypass, miniature chordal force transducers were implanted on four chordae in 23 Danish Landrace pigs. Chordae tendineae tension was recorded online in the open-chest condition with spontaneous circulation in three different hemodynamic conditions: baseline with no intervention; partial aortic occlusion; and during dobutamine infusion.
Systolic tension in secondary chordae under baseline conditions was significantly higher than in primary chordae (0.7 N versus 0.2 N, respectively). No significant impact on this distribution by changing the hemodynamic condition could be identified.
Chordal tension is distributed towards the secondary chordae, with a tension more than three-fold that in the primary counterpart. The magnitude of chordal tension seems to be determined primarily by ventricular pressure. This finding supports the hypothesis that secondary chordae are more important mediators of the valvular-ventricular interaction than are primary chordae.
Deviations from Brownian motion leading to anomalous diffusion are found in transport dynamics from quantum physics to life sciences. The characterization of anomalous diffusion from the measurement ...of an individual trajectory is a challenging task, which traditionally relies on calculating the trajectory mean squared displacement. However, this approach breaks down for cases of practical interest, e.g., short or noisy trajectories, heterogeneous behaviour, or non-ergodic processes. Recently, several new approaches have been proposed, mostly building on the ongoing machine-learning revolution. To perform an objective comparison of methods, we gathered the community and organized an open competition, the Anomalous Diffusion challenge (AnDi). Participating teams applied their algorithms to a commonly-defined dataset including diverse conditions. Although no single method performed best across all scenarios, machine-learning-based approaches achieved superior performance for all tasks. The discussion of the challenge results provides practical advice for users and a benchmark for developers.
Introduction
Anxiety disorders are the most prevalent mental health conditions among children and adolescents. However, it is estimated that less than 25% of all children and adolescents with an ...anxiety disorder receive professional help. Thus, it is of utmost importance to develop novel interventions that aim to increase treatment accessibility.
Objectives
The aim of this study is threefold, to determine the effectiveness of CoolMinds, an iCBT intervention for adolescents with anxiety disorders. In addition to investigate predictive factors and the networks between symptoms, severity and change from pre- to post- treatment.
Methods
The study is designed as a three-armed randomized controlled trial comparing iCBT with planned feedback, iCBT with on-demand help and a waitlist control, with 56 patients in each group. The participants in the two treatment conditions will receive 12 weeks of iCBT, while participants in the waitlist control wait for 12 weeks, before receiving iCBT with planned feedback. The participants in the two iCBT conditions will be randomized to get a booster session or not, 12 weeks after finishing treatment. The participants are adolescents between the age of 12 and 17 years and their parents. The families must live in the Region of Southern Denmark, and the adolescents must have a principal anxiety diagnosis according to DSM-5 criteria. The primary outcome measure are the Youth Online Diagnostic Assessment - child and parent versions. Outcomes will be evaluated at baseline, post-treatment and at the 3-, 6- and 12-month follow-ups. Symptoms of anxiety and depression are also measured between each session with PHQ-9 and S-SCAS.
Results
The results from this study will be submitted to high-status international and peer-reviewed journals, as well as be presented at national and international conferences.
Conclusions
This study will allow us to determine the efficacy of iCBT in adolescents with anxiety, where parent involvement is emphasized as part of the treatment. The results from this study intends to enhance accessibility of evidence-based treatment for adolescents with anxiety.
Disclosure of Interest
None Declared
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