scholarly journals Inaccuracy of the hinge point to hinge point aortic annulus measurement - a mathematical explanation and solution.

2021 ◽  
Author(s):  
Amit Srivastava ◽  
Anuj Srivastava
Keyword(s):  
Aortic Annulus ◽  
Mathematical Explanation ◽  
Hinge Point

Impact of Aortic Annulus Enlargement on the Outcomes of Aortic Valve Replacement: A Meta-analysis

2020 ◽  
Author(s):  
Michel Pompeu B.O. Sá ◽  
Konstantin Zhigalov ◽  
Luiz Rafael P. Cavalcanti ◽  
Antonio C. Escorel Neto ◽  
Sérgio C. Rayol ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Aortic Valve Replacement ◽  
Valve Replacement ◽  
Meta Analysis ◽  
Aortic Annulus

Manual versus automatic detection of aortic annulus plane in CT scan for T-AVI screening

2013 ◽  
Vol 61 (S 01) ◽  
Author(s):  
A Van Linden ◽  
J Kempfert ◽  
J Blumenstein ◽  
H Möllmann ◽  
WK Kim ◽  
...  
Keyword(s):  
Ct Scan ◽  
Automatic Detection ◽  
Aortic Annulus

The Non-Causal Character of Renormalization Group Explanations

2018 ◽  
Author(s):  
Margaret Morrison
Keyword(s):  
Probability Theory ◽  
Renormalization Group ◽  
Dynamical Systems ◽  
Recent Literature ◽  
Mathematical Explanation ◽  
Causal Status ◽  
Physical Information ◽  
The Relationship ◽  
Structural Aspects

After reviewing some of the recent literature on non-causal and mathematical explanation, this chapter develops an argument as to why renormalization group (RG) methods should be seen as providing non-causal, yet physical, information about certain kinds of systems/phenomena. The argument centres on the structural character of RG explanations and the relationship between RG and probability theory. These features are crucial for the claim that the non-causal status of RG explanations involves something different from simply ignoring or “averaging over” microphysical details—the kind of explanations common to statistical mechanics. The chapter concludes with a discussion of the role of RG in treating dynamical systems and how that role exemplifies the structural aspects of RG explanations which in turn exemplifies the non-causal features.

scholarly journals Numerical analysis of high-lift configurations with oscillating flaps

2021 ◽  
Author(s):  
Johannes Ruhland ◽  
Christian Breitsamter
Keyword(s):  
Reynolds Number ◽  
Flow Separation ◽  
Separated Flow ◽  
Navier Stokes ◽  
Rotational Axis ◽  
High Lift ◽  
Hinge Point ◽  
Reduced Frequency ◽  
Flap Deflection ◽  
The Impact

AbstractThis study presents two-dimensional aerodynamic investigations of various high-lift configuration settings concerning the deflection angles of droop nose, spoiler and flap in the context of enhancing the high-lift performance by dynamic flap movement. The investigations highlight the impact of a periodically oscillating trailing edge flap on lift, drag and flow separation of the high-lift configuration by numerical simulations. The computations are conducted with regard to the variation of the parameters reduced frequency and the position of the rotational axis. The numerical flow simulations are conducted on a block-structured grid using Reynolds Averaged Navier Stokes simulations employing the shear stress transport $$k-\omega $$ k - ω turbulence model. The feature Dynamic Mesh Motion implements the motion of the oscillating flap. Regarding low-speed wind tunnel testing for a Reynolds number of $$0.5 \times 10^{6}$$ 0.5 × 10 6 the flap movement around a dropped hinge point, which is located outside the flap, offers benefits with regard to additional lift and delayed flow separation at the flap compared to a flap movement around a hinge point, which is located at 15 % of the flap chord length. Flow separation can be suppressed beyond the maximum static flap deflection angle. By means of an oscillating flap around the dropped hinge point, it is possible to reattach a separated flow at the flap and to keep it attached further on. For a Reynolds number of $$20 \times 10^6$$ 20 × 10 6 , reflecting full scale flight conditions, additional lift is generated for both rotational axis positions.

scholarly journals Reply: Small aortic annulus: Can we dispel all the Hamletic doubts?

2021 ◽  
Vol 161 (2) ◽  
pp. e160
Author(s):  
Aziz Omar ◽  
Valentina Mancini ◽  
Michele Di Mauro
Keyword(s):  
Aortic Annulus ◽  
Small Aortic Annulus
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