scholarly journals Developmental modulation of Fab-7 boundary function

Development ◽  
2004 ◽  
Vol 131 (19) ◽  
pp. 4743-4749 ◽  
Author(s):  
S. E. Schweinsberg
Keyword(s):  
Boundary Function ◽  
Developmental Modulation

Optimization of the Robust Stability Limit for Multi-Cutter Turning Processes

2015 ◽  
Author(s):  
Marta J. Reith ◽  
Daniel Bachrathy ◽  
Gabor Stepan
Keyword(s):  
Robust Stability ◽  
Optimal Parameter ◽  
Stability Limit ◽  
Boundary Function ◽  
Lower Envelope ◽  
Computation Method ◽  
Parameter Region ◽  
Dynamical Parameters ◽  
The Stability ◽  
Machining Parameter

Multi-cutter turning systems bear huge potential in increasing cutting performance. In this study we show that the stable parameter region can be extended by the optimal tuning of system parameters. The optimal parameter regions can be identified by means of stability charts. Since the stability boundaries are highly sensitive to the dynamical parameters of the machine tool, the reliable exploitation of the so-called stability pockets is limited. Still, the lower envelope of the stability lobes is an appropriate upper boundary function for optimization purposes with an objective function taken for maximal material removal rates. This lower envelope is computed by the Robust Stability Computation method presented in the paper. It is shown in this study, that according to theoretical results obtained for optimally tuned cutters, the safe stable machining parameter region can significantly be extended, which has also been validated by machining tests.

scholarly journals Developmental modulation of myocardial mechanics: Age- and growth-related alterations in afterload and contractility

1992 ◽  
Vol 19 (3) ◽  
pp. 619-629 ◽  
Author(s):  
Steven D. Colan ◽  
Ira A. Parness ◽  
Philip J. Spevak ◽  
Stephen P. Sanders
Keyword(s):  
Age And Growth ◽  
Myocardial Mechanics ◽  
Developmental Modulation

scholarly journals Time-to-Boundary Function to Study the Development of Upright Stance Control in Children

2017 ◽  
Vol 11 (1) ◽  
pp. 49-58
Author(s):  
Carmen D'Anna ◽  
Maurizio Schmid ◽  
Andrea Scorza ◽  
Salvatore A. Sciuto ◽  
Luisa Lopez ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Postural Control ◽  
Postural Stability ◽  
Age Groups ◽  
Boundary Function ◽  
Mean Value ◽  
Upright Stance ◽  
Eyes Closed ◽  
The Mean ◽  
Spatio Temporal

Background: The development of postural control across the primary school time horizon is a complex process, which entails biomechanics modifications, the maturation of cognitive ability and sensorimotor organization, and the emergence of anticipatory behaviour. Postural stability in upright stance has been thus object of a multiplicity of studies to better characterize postural control in this age span, with a variety of methodological approaches. The analysis of the Time-to-Boundary function (TtB), which specifies the spatiotemporal proximity of the Centre of Pressure (CoP) to the stability boundaries in the regulation of posture in upright stance, is among the techniques used to better characterize postural stability in adults, but, as of now, it has not yet been introduced in developmental studies. The aim of this study was thus to apply this technique to evaluate the development of postural control in a sample population of primary school children. Methods: In this cross-sectional study, upright stance trials under eyes open and eyes closed were administered to 107 healthy children, divided into three age groups (41 for Seven Years' Group, Y7; 38 for Nine Years' Group, Y9; 28 for Eleven Years' Group, Y11). CoP data were recorded to calculate the Time-to-Boundary function (TtB), from which four spatio-temporal parameters were extracted: the mean value and the standard deviation of TtB minima (Mmin, Stdmin), and the mean value and the standard deviation of the temporal distance between two successive minima (Mdist, Stddist). Results: With eyes closed, Mmin and Stdmin significantly decreased and Mdist and Stddist increased for the Y7 group, at Y9 Mmin significantly decreased and Stddist increased, while no effect of vision resulted for Y11. Regarding age groups, Mmin was significantly higher for Y9 than Y7, and Stdmin for Y9 was higher than both Y7 and Y11; Mdist and Stddist resulted higher for Y11 than for Y9. Conclusion: From the combined results from the spatio-temporal TtB parameters, it is suggested that, at 9 years, children look more efficient in terms of exploring their limits of stability than at 7, and at 11 the observed TtB behaviour hints at the possibility that, at that age, they have almost completed the maturation of postural control in upright stance, also in terms of integration of the spatio-temporal information.

scholarly journals On union-closed sets and Conway's sequence

1993 ◽  
Vol 47 (2) ◽  
pp. 321-332 ◽  
Author(s):  
J-C. Renaud ◽  
L.F. Fitina
Keyword(s):  
Upper Bound ◽  
Boundary Function ◽  
Closed Sets

In 1991 Renaud defined a boundary function φ(n) for union-closed sets, and evaluated it to n = 17. Also in 1991, Mallows examined a sequence a(n) defined recursively by Conway in 1988.Investigation of some properties of strictly reduced ordered power sets, a class of union-closed sets, leads to the conclusion that a(n + 1) is an upper bound for φ(n), and the union-closed sets conjecture holds if the conjecture φ(n) = a(n + 1) is valid.

A boundary function equation and its numerical solution

2007 ◽  
Vol 18 (3) ◽  
pp. 234-244
Author(s):  
D. S. Filippychev
Keyword(s):  
Numerical Solution ◽  
Boundary Function

Developmental modulation of glutamatergic inspiratory drive to hypoglossal motoneurons

1997 ◽  
Vol 110 (2-3) ◽  
pp. 125-137 ◽  
Author(s):  
G.D Funk ◽  
M.A Parkis ◽  
S.R Selvaratnam ◽  
C Walsh
Keyword(s):  
Hypoglossal Motoneurons ◽  
Developmental Modulation

New Boundary Function In Fuzzy Topological Spaces

2021 ◽  
Vol 67 (6) ◽  
pp. 50-57
Author(s):  
Sanjivappa K Dembare
Keyword(s):  
Boundary Function ◽  
Topological Spaces ◽  
Fuzzy Topological Spaces
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