Chapter Five The Fourth Mode of FESF: Epistemology and Language

2016 ◽  
pp. 175-223
Author(s):  
Ritch Calvin
Keyword(s):  
Fourth Mode

Stabilizing Effect of Yawning on Nasal Cycle

2020 ◽  
pp. 1-3
Keyword(s):  
Left Nostril ◽  
The Third ◽  
Nasal Cycle ◽  
Air Resistance ◽  
Second Mode ◽  
Stabilizing Effect ◽  
The Right ◽  
Fourth Mode

The dominant passability of the left or right nostril in terms of nasal air resistance can be classified into 4 main modes. In the first mode, both nostrils are closed and have equal and low air passability. In the second mode, the passability of the right nostril is higher than the left. In the third mode, the passability of the left nostril is higher than the right. In the fourth mode, both nostrils are open and passability of nostrils is equal and high. The first and fourth modes are unstable (with duration- minutes). The second and third modes are stable (with duration-hours). Author presents a yawning as physiological reflex leading to transition from unstable to stable modes.

Analysis of the Leakage-Flow-Induced Vibration of a Slip Joint in a Jet Pump of a Boiling Water Reactor

2019 ◽  
Vol 390 ◽  
pp. 23-31 ◽  
Author(s):  
J. Cruz Castro ◽  
E. Hernández Palafox ◽  
I.A. Alarcón Sánchez ◽  
Luis H. Hernández-Gómez ◽  
Pablo Ruiz-López ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Natural Frequencies ◽  
Excitation Frequency ◽  
Vibration Modes ◽  
The Finite Element Method ◽  
Jet Pump ◽  
Flow Induced Vibration ◽  
Ansys Fluent ◽  
Pump Assembly ◽  
Fourth Mode

The purpose of this analysis is to evaluate the structural integrity of the jet pump assembly of a BWR during the performance of its operational and safety functions. The natural frequencies and vibration modes of the jet pump assembly immersed in water were determined. It was observed that the fourth mode shape was torsional, and its associated resonance frequency was 41.82 Hz. Also, the vibration induced by the flow in the leakage of the slip joint was analyzed with an axisymmetric model. The gap of the slip joint was varied from 0.2 mm until 0.65bmm. A gap between 0.6 and 0.64, would cause flow-induced vibration because this excitation frequency matches with the fourth natural frequency of the jet pump assembly. The above was carried out using computational fluid dynamics, as well as the finite element method, with ANSYS Structural and ANSYS Fluent codes.

Unconfusing Merely Confused Supposition in Albert of Saxony

Vivarium ◽  
2012 ◽  
Vol 50 (2) ◽  
pp. 161-189 ◽  
Author(s):  
Michael J. Fitzgerald
Keyword(s):  
14Th Century ◽  
Logical Strength ◽  
Fourth Mode

Abstract In this essay I argue that Albert would reject the need for a separate fourth mode of common personal supposition, and that his view of merely confused supposition has not been fully explicated by modern scholars. I first examine the various examples of conjunct descent given by modern scholars from his Perutilis logica, and show that Albert clearly adopts it in resolving the sophistic examples involved. Second, I explicate the view of merely confused supposition that Albert defends in his Sophismata, and then attempt to answer the question: which view of merely confused supposition was his final view, the view articulated in the Perutilis logica or the view in the Sophismata? I conclude that based upon his Sophismata view of merely confused supposition, Albert came to realize the logical strength his revised theory of personal supposition afforded, and consequently, that he is one of the earliest 14th-century logicians to adopt conjunct terminal descent to resolve various sophisms, a move which gave his theory of personal supposition a logical symmetry having two sorts of propositional descents to singulars, and two sorts of terminal descents to singulars.

Effects of a physical librations of the moon caused by a liquid core, and determination of the fourth mode of a free libration

2014 ◽  
Vol 48 (6) ◽  
pp. 403-419 ◽  
Author(s):  
Yu. V. Barkin ◽  
H. Hanada ◽  
K. Matsumoto ◽  
S. Sasaki ◽  
M. Yu. Barkin
Keyword(s):  
Liquid Core ◽  
The Moon ◽  
Free Libration ◽  
Fourth Mode

Sensing Signal and Energy Generation Analysis on a Flexoelectric Beam

2012 ◽  
Author(s):  
S. D. Hu ◽  
H. Li ◽  
H. S. Tzou
Keyword(s):  
Cantilever Beam ◽  
Coupling Effect ◽  
Mechanical Strain ◽  
Electric Energy ◽  
Energy Generation ◽  
Electric Polarization ◽  
Ambient Vibration ◽  
Electric Voltage ◽  
Flexoelectric Effect ◽  
Fourth Mode

Flexoelectricity is known as an electromechanical gradient coupling effect. The direct flexoelectric effect that can convert mechanical strain gradient into electric polarization (or electric field) plays an important role in charge generation in the situation when piezoelectricity is absent. This study focuses on the application of the direct flexoelectric effect based on a flexoelectric cantilever beam to investigate its effectiveness of sensing signal and energy generation. The dielectric cantilever beam is deposited with electrodes both on top and bottom surfaces to generate an electric voltage. The sensing mechanism of flexo-piezo-electric effect is analyzed and the expression of sensing signal is derived. Results show that the output sensing signal is only contributed by the flexoelectric effect while the piezoelectric effect is eliminated due to the symmetric bending strains through the beam thickness. The spatial distribution of sensing signal when the fully covered electrode is uniformly segmented to 10 patches is evaluated as an illustration, and the flexoelectric sensitivity of about 0.15V/mm for the first mode and 4V/mm for the fourth mode is achieved. The optimal sensing position is dependent of the electrode size and the vibration mode and in general, it locates where the difference between the slopes at two ends of the electrode patch reaches maximum. Based on the flexoelectric voltage, the energy generation power is also conducted when the flexoelectric cantilever beam is treated as distributed energy harvesters. As a result, the maximal power of RMS is about 1.5×10−8W/mm for the first mode and increases to about 0.6mW/mm for the fourth mode. It provides an alternative way to harvest electric energy from the ambient vibration without using piezoelectricity.

Dominant Interannual and Decadal Variability of Winter Surface Air Temperature over Asia and the Surrounding Oceans

2008 ◽  
Vol 21 (6) ◽  
pp. 1371-1386 ◽  
Author(s):  
Chihiro Miyazaki ◽  
Tetsuzo Yasunari
Keyword(s):  
Tibetan Plateau ◽  
Air Temperature ◽  
Surface Air Temperature ◽  
Silk Road ◽  
Western Pacific ◽  
The Tibetan Plateau ◽  
The Third ◽  
The North ◽  
Atmospheric Wave ◽  
Fourth Mode

Abstract To clarify the interannual variability of winter surface air temperature (SAT) over Asia and the surrounding oceans, the authors applied principal component analysis to normalized monthly SATs. The first mode represents the Asian north–south dipole pattern with a node over the Tibetan Plateau. This component has close relationships to the Arctic Oscillation and cold surge variability around Southeast Asia, showing decadal oscillation with signal changes in 1988 and 1997. The second mode is the inner-Asian mode with a center to the north of the Tibetan Plateau. This component connects to fluctuations of not only the western Siberian high but also the Icelandic low, which is associated with the pattern of the polar vortex over Eurasia. A recent warming trend and possible relationship to solar activity are also shown. The modes of Asian SAT variability associated with ENSO are extracted as the north–south dipole mode over the tropical western Pacific and Japan (the third mode) and Silk Road mode (the fourth mode). The two independent modes appear to be caused by different sea surface temperature (SST) anomalies over the western Pacific and Indian Ocean and their associated atmospheric Rossby wave responses: the atmospheric wave trains over both the north and south of the Tibetan Plateau in the third mode, and the atmospheric wave train that propagates toward the Silk Road via Greenland in the fourth mode.

Nonlinear Dynamics of a Transversely Excited Flexible Cantilever Beam

1995 ◽  
Author(s):  
Mahmood Tabaddor ◽  
Ali H. Nayfeh
Keyword(s):  
Nonlinear Dynamics ◽  
Natural Frequency ◽  
Cantilever Beam ◽  
Experimental Results ◽  
Modal Interactions ◽  
Frequency Sweep ◽  
Second Mode ◽  
Fourth Mode

Abstract Some experimental results concerning the nonlinear dynamics of a transversely excited beam are presented. The excitation is harmonic. A frequency sweep around the fourth natural frequency of the beam reveals some interesting modal interactions. The first phenomenon is the transfer of energy from the fourth mode, approximately 33.10 Hz, to the first mode, approximately 0.70 Hz. This interaction involves modulation of the amplitude and phase of the fourth mode. The second interaction involves the participation of the fourth mode and the second mode, approximately 5.80 Hz. The mechanism by which the second mode is activated as yet remains unidentified.

scholarly journals Effects of the angle of impact on the aeroacoustic feedback mechanism in supersonic impinging planar jets

2018 ◽  
Vol 18 (2-3) ◽  
pp. 258-278 ◽  
Author(s):  
Romain Gojon ◽  
Christophe Bogey
Keyword(s):  
Flat Plate ◽  
Classical Model ◽  
Shear Layers ◽  
Feedback Mechanism ◽  
Tone Frequency ◽  
Mean Velocity ◽  
Fourier Decomposition ◽  
The Third ◽  
The Impact ◽  
Fourth Mode

Three planar impinging supersonic jets of infinite extent are simulated using compressible large eddy simulations in order to study the effects of the angle of impact on the flow and acoustic fields of the jet. At the exit of a nozzle of height h, they are ideally expanded and have an exit velocity uj, yielding a Mach number of 1.28 and a Reynolds number of 5 × 104. They impinge on a flat plate at a distance 5.5 h from the nozzle lips with angles of 60°, 75°, and 90° between the jet direction and the plate. Mean velocity flows and snapshots of density, pressure, and vorticity are first shown. The mean convection velocity of the turbulent structures in the jet shear layers is then determined. The sound pressure levels are computed, and several tones due to the presence of a feedback mechanism are found to establish between the nozzle lips and the flat plate. They agree well with the corresponding measurements and with the classical model of the feedback mechanism. Moreover, when the angle of impact deviates from 90° to 75°, a jump from the third to the fourth mode of the feedback mechanism and a reduction in intensity are noted. By applying a Fourier decomposition to the near pressure fields, hydrodynamic–acoustic standing waves are found for each dominant tone frequency. Moreover, as suggested by amplitude fields and velocity spectra in the jet shear layers, the feedback mechanism seems to establish mainly along the lip that is farther away from the plate when the impact angle is not normal. This jump from the third to the fourth mode is similar to the jump observed experimentally for an angle of impact of 90° when the nozzle-to-plate distance increases from 5.5 h to 5.85 h. Finally, for an angle of impact of 60°, it is seen that none of the modes of the feedback persists in time, but that several modes randomly establish during short periods of time. These rapid switches between different modes lead to several tones that are less energetic on average and centered on St = 0.25.

Urban platforms as a mode of governance

2021 ◽  
pp. 002085232110058
Author(s):  
Arto Haveri ◽  
Ari-Veikko Anttiroiko
Keyword(s):  
Value Added ◽  
Network Governance ◽  
City Governments ◽  
Public Governance ◽  
Public Managers ◽  
Platform Governance ◽  
Set Up ◽  
Theoretical Analyses ◽  
Fourth Mode

This article provides an analysis of urban platform governance by mapping out the major forms of public governance and depicting the role of platforms in this field. By fusing theoretical analyses and empirical views from three urban platforms set up by the largest cities in Finland, we assess the relevance of platforms as an emerging form of local public governance. It is plausible to view platforms as hybrids that incorporate features of both networks and markets, and, to some extent, even hierarchies. However, platforms also have some irreducible features, which makes it possible to perceive them as a fourth mode of governance. Platform logic broadens the view of network governance to a broader set of connections, the orchestration of multiple logics and ecosystem thinking. Points for practitioners Today, city governments create and maintain urban platforms to bring together different actors and enable value-added collaboration in service provision, governance and planning. This article helps local policymakers and managers understand platform logic in involving various audiences in the creation of public value. When governing platforms, local public managers may use many of the same methods as with networks. Platform governance, however, extends the view to a broader set of connections, the orchestration of multiple logics and ecosystem thinking.

Multi-layered diffusive convection. Part 1. Spontaneous layer formation

2010 ◽  
Vol 651 ◽  
pp. 443-464 ◽  
Author(s):  
TAKASHI NOGUCHI ◽  
HIROSHI NIINO
Keyword(s):  
Nonlinear Process ◽  
Layer Formation ◽  
Second Stage ◽  
Diffusive Convection ◽  
Second Mode ◽  
Convective Motions ◽  
Gradient Ratio ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Fourth Mode

Diffusive convection in an infinite two-dimensional fluid with linear vertical gradients of temperature and salinity is studied numerically and analytically. When the density gradient ratio exceeds a critical value above which diffusive convection grows according to the linear stability analysis, spontaneous layer formation is found to occur. At the first stage nearly steady oscillating motions, the horizontal scale of which is of the order of the buoyancy boundary layer scale δ, arise. After several tens of the oscillation cycle, a transition to the second stage occurs in which overturning convective motions develop and well-mixed regions are formed. The convective motions resemble Rayleigh–Bénard convection at a high Rayleigh number. The well-mixed regions are gradually organized into horizontal layers, a typical thickness of which is of the order of δ. A detailed analysis of the nonlinear process during the layer formation reveals that four modes are responsible for the layer formation: The first mode is the linear fastest-growing mode with wavenumber vector (k0, 0). The second mode with (k0, m0) is weakly growing. The third mode with (0, m0) is dissipating, and the fourth mode is its higher harmonic having (0, 2m0). It is shown that a truncated spectral model with the four modes well reproduces the results of the full numerical simulation.

Sign in / Sign up

Export Citation Format

Share Document