Implementation of pediatric home spirometry: potential height bias

2020 ◽  
pp. 2107
Author(s):  
Ariel Berlinski
Keyword(s):  
Potential Height

Morphometrics of the aerial roots of Kingia australis (Liliales)

1981 ◽  
Vol 29 (1) ◽  
pp. 81 ◽  
Author(s):  
B Lamont
Keyword(s):  
Fire History ◽  
Dead Zone ◽  
Dry Weight ◽  
Root Primordia ◽  
Stem Apex ◽  
Primary Roots ◽  
Aerial Roots ◽  
History Of ◽  
Lateral Branches ◽  
Potential Height

Kingia australis, common in the heaths and forests of south-western Australia, is distinguished from all other grass trees in Australia by the presence of a mantle of concealed aerial roots. A ring of up to 50 root primordia is initiated in winter from the stem apex. In plants more than 1 m high, initiation and commencement of elongation of the primary roots are no longer annual but dependent on the fire history of the plant. These roots descend between the stem and persistent leaf bases at about 2 cm per growing month, sending many lateral branches among the leaf bases. Aerial roots gradually replace the space occupied by the leaf bases until they may account for 45% of the dry weight of the aerial caudex. The caudex of one 6-m-high specimen bore up to 27 roots per cm2 transection of the root mantle, with about 3000 primary roots entering the soil. All underground primary roots (except the initial contractile roots) have an aerial origin and are concentrated vertically under the canopy. After 300-400 years the stem starts to die back from the base, and the aerial roots attached to that portion disintegrate. By propping up the stem and bridging the dead zone of the stem, the living aerial roots greatly extend the potential height and longevity of the plant. In addition, the hairy laterals are ideally located to absorb water and nutrients directly from the leaf bases. Protective and aerating functions are also indicated.

scholarly journals Evaluation of the transformation potential of urbanised landscape (Vilnius case).

2018 ◽  
Vol 13 ◽  
pp. 28-38
Author(s):  
Dalia Dijokiene
Keyword(s):  
Visual Effect ◽  
Integrated Method ◽  
Urban Structures ◽  
Heritage Site ◽  
Analytical Work ◽  
Transformation Potential ◽  
Potential Impact ◽  
The City ◽  
New Buildings ◽  
Potential Height

The article analyzes the evaluation of the transformation potential of valuable urbanised landscape. Many of the old towns formed as valuable urbanised landscapes. However, the transformation of urban structures of viable cities, which also entails transformation of urbanised landscapes, is inevitable. Basically, there are only two ways of transformation – either it happens in its own way or it can be professionally controlled. In this article the problem of urbanised landscape transformation is illustrated by the analytical work carried out for the eastern part of the Old Town of Vilnius (UNESCO heritage site). In the eastern part of the Old Town of Vilnius there are two architectural ensembles that form the characteristic panoramas and silhouettes of the Old Town. In this part of the city, various new built-up initiatives have been active since 2007. The article discusses the urban research, the purpose of which was to answer the question about the potential height of the newly designed built up in a former historic suburb of Vilnius. The potential impact of new buildings on the panoramas, silhouettes, dominant elements, and perspectives as well as nominal spaces of that concrete street of the historical suburb is assessed based on the analysis of the towns cape seen from typical external and internal viewing points of the Old Town. The article describes an integrated method of assessing visual effect on the urbanised landscape.

scholarly journals Calculation of barrier potential height using fraction parameter

2021 ◽  
pp. 105038
Author(s):  
Rizal Kurniadi ◽  
Anto Sulaksono ◽  
Yudha S. Perkasa
Keyword(s):  
Barrier Potential ◽  
Potential Height

scholarly journals Adiabatic Brownian motor with a stepwise potential perturbed by a dichotomous harmonic sygnal

2021 ◽  
pp. 71-80
Author(s):  
Irina V. Shapochkina ◽  
Nastassia D. Savina ◽  
Elena M. Zaytseva ◽  
Viktor M. Rozenbaum ◽  
Maria I. Ikim ◽  
...  
Keyword(s):  
Average Velocity ◽  
Motion Velocity ◽  
Motor Systems ◽  
System Parameters ◽  
Brownian Motor ◽  
Average Motion ◽  
Symmetry Properties ◽  
Motor Velocity ◽  
Further Development ◽  
Potential Height

We obtained an analytical expression for the average motion velocity of an adiabatic Brownian motor (ratchet), which operates due to small dichotomous spatially harmonic fluctuations of a stepwise potential. The symmetry properties of the average velocity as a functional of the stationary and fluctuating components of the nanoparticle potential energy are revealed, and the ranges of values of the system parameters that ensure the rightward and leftward motion of the motor are determined. We showed that the average motor velocity is a non-monotonic function of the stepwise potential height. For a singular (infinitely high and narrow) potential barrier, the average velocity depends non-monotonically on the «power» of this barrier (the barrier width multiplied by the exponent of the ratio of the barrier height to the thermal energy). The article continues the further development of theoretical methods of symmetry analysis by applying the general approaches proposed by the authors to specific motor systems.

scholarly journals The Quantum Hydrodynamic Smooth Effective Potential

VLSI Design ◽  
1998 ◽  
Vol 6 (1-4) ◽  
pp. 17-20
Author(s):  
Carl L. Gardner ◽  
Christian Ringhofer
Keyword(s):  
Stress Tensor ◽  
Effective Stress ◽  
Effective Potential ◽  
Particle Flow ◽  
Barrier Region ◽  
Qhd Model ◽  
Quantum Hydrodynamic ◽  
Classical Potential ◽  
Potential Height

An extension of the quantum hydrodynamic (QHD) model is discussed which is valid for classical potentials with discontinuities. The effective stress tensor for the QHD equations cancels the leading singularity in the classical potential at a barrier and leaves a residual smooth effective potential with a lower potential height in the barrier region. The smoothing makes the barrier partially transparent to the particle flow and provides the mechanism for particle tunneling in the QHD model.

Study of strong-coupling impurity bound polaron in a quantum pseudodot

2015 ◽  
Vol 29 (09) ◽  
pp. 1550058 ◽  
Author(s):  
R. Khordad
Keyword(s):  
Excited State ◽  
Quantum Dot ◽  
Strong Coupling ◽  
Coupling Strength ◽  
State Energy ◽  
Transition Frequency ◽  
Excited State Energy ◽  
Quantum Pseudodot ◽  
Bound Polaron ◽  
Potential Height

In the present work, we have studied the first internal excited state energy and transition frequency of strong-coupling impurity bound polaron in a quantum pseudodot using the well-known Lee–Low–Pines (LLP) unitary transformation method. We show the effect of Coulomb bound potential, electron–phonon (e–p) coupling strength, the quantum dot radius and potential height on first internal excited state energy and the transition frequency of the impurity bound polaron. According to the results, it is found that the first internal excited state energy is decreased with increasing quantum dot radius. Also, this energy is increased with enhancing potential height. The transition frequency is increased with increasing the e–p coupling strength. Also, the first internal excited state energy is increased with decreasing the e–p coupling strength. The transition frequency is enhanced with increasing the Coulomb bound potential.

scholarly journals Interface-structure Dependent Confining Potential Height and Quantized Energy of Ge Nanodots Fabricated onto the Oxidized Si Substrate

Hyomen Kagaku ◽  
2006 ◽  
Vol 27 (9) ◽  
pp. 523-529 ◽  
Author(s):  
Yasuo NAKAYAMA ◽  
Iwao MATSUDA ◽  
Shuji HASEGAWA ◽  
Masakazu ICHIKAWA
Keyword(s):  
Interface Structure ◽  
Si Substrate ◽  
Confining Potential ◽  
Potential Height

Deuteron NMR of Methyl Groups in theTunneling Regime. A Single Crystal Study of Aspirin-CD3

1995 ◽  
Vol 50 (1) ◽  
pp. 95-116 ◽  
Author(s):  
A. Detken ◽  
P. Focke ◽  
U. Haeberlen ◽  
Z. Olejniczak ◽  
Z. T. Lalowicz ◽  
...  
Keyword(s):  
Single Crystal ◽  
Molecular System ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Temperature Limit ◽  
Spin Lattice Relaxation ◽  
Temperature Range ◽  
Spin Lattice ◽  
Potential Height ◽  
Deuteron Nmr

We report the first single crystal deuteron NMR spectra of CD3 groups which display the socalled ±ß, ±(|α| ± ß) and ±(2|α| ± ß) lines characteristic of rotational tunneling in a sufficiently clear manner to allow a quantitative comparison with the respective theory developed in 1988 by the group of W. Müller-Warmuth. The molecular system we study is aspirin-CD3. We recorded spectra for differently oriented single crystals and measured spin-lattice relaxation times T1 in a wide temperature range. At 12.5 K we exploit the dependence of the ±(|α| ± ß) and ±(2|α| ± ß) lines on the orientation of the applied field B0 for determining the equilibrium orientation of the CD3 group in the crystal lattice. The spectra display features which allow, by comparison with simulated spectra, a measurement of the tunnel frequency vt. Its low temperature limit is (2.7 ± 0.1) MHz. It allows to infer the height V3 of the potential V(φ) in which the CD3 group moves, provided that this potential is purely threefold. We get V3 = (47.2 ± 0.5) meV. The transition from the tunneling to the classical, fast reorienting regime occurs in the 15 K ≲ T ≲ 35 K temperature range. In this range we observe a broadening, merging and eventually narrowing of the ± |α| and ±2|α| lines in very much the way predicted by Heuer. His theory, however, must be extended by taking into account all librational levels. The behaviour of the ± ß lines in the transition temperature range signalizes a reduction of the observable tunnel frequency with increasing temperature. This reduction allows an independent measurement of the potential height and represents a test of the assumption of a purely threefold potential. From the T1 -data we derive the temperature dependence of the correlation time Ƭc of the reorientational jumps. The plot of log Ƭc vs. 1 /T follows a straight line for more than five decades. From its slope we get yet another independent number for the potential height. It agrees well with the other ones, which confirms the assumption of the essentially threefold potential V(φ) in aspirin-CD3.

Carotid sinus distension and superior cervical ganglion transmission

1981 ◽  
Vol 240 (5) ◽  
pp. H716-H720
Author(s):  
R. S. Tuttle ◽  
M. McCleary
Keyword(s):  
Action Potential ◽  
Superior Cervical Ganglion ◽  
Functional Relationship ◽  
Carotid Sinus ◽  
Sympathetic Innervation ◽  
Balloon Catheter ◽  
Balloon Inflation ◽  
Cervical Ganglion ◽  
Reflex Arc ◽  
Potential Height

The functional relationship between sinusal distension and the sympathetic innervation of the feline carotid sinus was investigated by neurophysiological techniques. A balloon catheter was used to distend the sinus region while recording evoked postganglionic activity from the superior cervical ganglion. When the SCG was stimulated at 1.0 or 10.0/s, balloon inflation reduced postganglionic action potential height by 25-50% and increased ganglionic negativity. These effects were subsequently abolished by section of one of the remaining intact postganglionic trunks. This evidence suggests that a pressure-modulated reflex arc, similar to the intestinointestinal reflex, might exist between the carotid sinus and superior and cervical ganglion.

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