Stripping the one‐dimensional acoustic pressure response into propagating and standing wave components

1986 ◽  
Vol 80 (S1) ◽  
pp. S70-S70
Author(s):  
Charles E. Spiekermann ◽  
Clark J. Radcliffe
Keyword(s):  
Standing Wave ◽  
Acoustic Pressure ◽  
Pressure Response ◽  
One Dimensional ◽  
The One

The Mechanisms Whereby Double Helical Offset-Toothed Synchronous Belt Produces Lower Noise Than Straight-Toothed Synchronous Belt: A Theoretical Investigation

2016 ◽  
Author(s):  
Jianhua Guo ◽  
Yu Wang ◽  
Qingming Hu ◽  
Shan Li ◽  
Ze He ◽  
...  
Keyword(s):  
Standing Wave ◽  
Sound Field ◽  
Experimental Investigations ◽  
Sound Power ◽  
One Dimensional ◽  
Impact Noise ◽  
Helical Angle ◽  
The One ◽  
The Impact ◽  
Lower Noise

Recent experimental investigations demonstrate that the level of noise generated by double helical synchronous belt (DHSB) is lower than that by straight-toothed synchronous belt (STSB). The present study is to theoretically elucidate the mechanisms whereby DHSB produces lower noise. In the theoretical analysis, a model DHSB is divided into several parallel narrow DHSBs with equal width. Let each narrow DHSB’s helical angle be 0° so each narrow DHSB becomes a narrow STSB. The theory of the one-dimensional sound field is then applied to obtain the standing wave solution of impact sound pressure. The sum of impact sound pressures by the narrow STSBs derived from one pair (left- and right-handed) of helical teeth of the model DHSB represents transmission impact noise. Computational results reveal that the power of impact sound at the damping-frequency decreases as the helical tooth’s angle increases. In addition, the impact sound power decreases as the degree of tooth’s offset of a double helical offset-toothed synchronous belt (DHOTSB) increases. Impact sound power is in the following order from high to low: STSB » DHSB > DHOTSB. In experimental investigations, the noise was in the following order from high to low: STSB » DHSB > DHOTSB, consistent with theoretical prediction. Also, the sound power at high frequency was markedly attenuated in DHSB or DHOTSB, the impact noise is the major sources of noise. Thus, the reduced noise in DHSB and DHOTSB can be explained by the one-dimensional standing wave sound field theory.

Exploring the Multidimensional Facets of Authoritarianism: Authoritarian Aggression and Social Dominance Orientation

2008 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Stefano Passini
Keyword(s):  
Social Dominance ◽  
Factor Model ◽  
Three Dimensional ◽  
Social Dominance Orientation ◽  
Model Fit ◽  
Regression Analyses ◽  
One Dimensional ◽  
Confirmatory Factor ◽  
The One ◽  
Better Than

The relation between authoritarianism and social dominance orientation was analyzed, with authoritarianism measured using a three-dimensional scale. The implicit multidimensional structure (authoritarian submission, conventionalism, authoritarian aggression) of Altemeyer’s (1981, 1988) conceptualization of authoritarianism is inconsistent with its one-dimensional methodological operationalization. The dimensionality of authoritarianism was investigated using confirmatory factor analysis in a sample of 713 university students. As hypothesized, the three-factor model fit the data significantly better than the one-factor model. Regression analyses revealed that only authoritarian aggression was related to social dominance orientation. That is, only intolerance of deviance was related to high social dominance, whereas submissiveness was not.

Adiabatic large polarons in anisotropic molecular crystals

2011 ◽  
Vol 35 (1) ◽  
pp. 15-27
Author(s):  
Zoran Ivić ◽  
Željko Pržulj
Keyword(s):  
Energy Transfer ◽  
Effective Mass ◽  
Molecular Crystals ◽  
Single Chain ◽  
Proper Understanding ◽  
One Dimensional ◽  
Interchain Coupling ◽  
Large Polaron ◽  
The One

Adiabatic large polarons in anisotropic molecular crystals We study the large polaron whose motion is confined to a single chain in a system composed of the collection of parallel molecular chains embedded in threedimensional lattice. It is found that the interchain coupling has a significant impact on the large polaron characteristics. In particular, its radius is quite larger while its effective mass is considerably lighter than that estimated within the one-dimensional models. We believe that our findings should be taken into account for the proper understanding of the possible role of large polarons in the charge and energy transfer in quasi-one-dimensional substances.

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