Shape and aspect ratio analysis of anisotropic magnetic nanochains based on TEM micrographs

2018 ◽  
Vol 44 (11) ◽  
pp. 12340-12351 ◽  
Author(s):  
Lazar Kopanja ◽  
Marin Tadić ◽  
Slavko Kralj ◽  
Joviša Žunić
Keyword(s):  
Aspect Ratio ◽  
Ratio Analysis

On the linear instability of elliptic pipe flow

1996 ◽  
Vol 316 ◽  
pp. 307-324 ◽  
Author(s):  
R. R. Kerswell ◽  
A. Davey
Keyword(s):  
Aspect Ratio ◽  
Pipe Flow ◽  
Critical Reynolds Number ◽  
Linear Instability ◽  
Asymptotic Result ◽  
Ratio Analysis ◽  
Plane Poiseuille Flow ◽  
Small Aspect Ratio ◽  
Aspect Ratios ◽  
Ratio Asymptotics

The linear stability of elliptic pipe flow is considered for finite aspect ratios thereby bridging the gap between the small-aspect-ratio analysis of Davey & Salwen (1994) and the large-aspect-ratio asymptotics of Hocking (1977). The flow is found to become linearly unstable above an aspect ratio of about 10.4 to the spanwise-modulated analogue of the Orr-Sommerfeld mode to which plane Poiseuille flow first loses stability. This disturbance is found to possess a series of intense vortices along its critical layer at lateral stations far removed from the central minor axis. The critical Reynolds number appears to fall from infinity as the aspect ratio increases above 10.4, ultimately approaching Hocking's (1977) asymptotic result at much larger aspect ratios.

Aspect Ratio Analysis Using Image Processing for Rice Grain Quality

2010 ◽  
Vol 6 (5) ◽  
Author(s):  
Amit K Aggarwal ◽  
Ratan Mohan
Keyword(s):  
Image Processing ◽  
Aspect Ratio ◽  
Local Market ◽  
Rice Grain ◽  
Ratio Analysis ◽  
Ratio Distribution ◽  
Aspect Ratios ◽  
Percent Accuracy ◽  
Aspect Ratio Distribution

Determination of aspect ratio distribution is important for elongated, needle-shaped particles whose utility and/or value may depend on this feature. In this work rice grain is taken as an example of such a particle and its aspect ratio distribution in various samples is found using image processing. The samples examined were from three different grades (commonly termed as full, half and broken) sold in local market and priced according to their size. From the analysis, reference aspect ratios were assigned to classify the grains and hence determine the extent of off-size in each market grade. Further, the effectiveness of the technique to quantify mixed or adulterated grades was studied. It was found that it is possible to know the undesired content within 10 percent accuracy.

scholarly journals Aspect ratio analysis for ground states of bosons in anisotropic traps

1996 ◽  
Vol 46 (S1) ◽  
pp. 549-550 ◽  
Author(s):  
Kirill N. Ilinski ◽  
Alexander Moroz
Keyword(s):  
Aspect Ratio ◽  
Ground States ◽  
Ratio Analysis

scholarly journals Scythes, sickles and other blades: defining the diversity of pectoral fin morphotypes in Pachycormiformes

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7675
Author(s):  
Jeff J. Liston ◽  
Anthony E. Maltese ◽  
Paul H. Lambers ◽  
Dominique Delsate ◽  
William E.H. Harcourt-Smith ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Suspension Feeder ◽  
Ratio Analysis ◽  
Pectoral Fin ◽  
Landmark Analysis ◽  
Pectoral Fins ◽  
Fin Shape

The traditional terminology of ‘scythe’ or ‘sickle’ shaped is observed to be flawed as an effective descriptor for pectoral fin shape in pachycormids. The diversity of pachycormid pectoral fin shapes is assessed across the 14 recognised genera that preserve complete pectoral fins, and improved terms are defined to more effectively describe their form, supported by anatomical observation and aspect ratio analysis of individual fins, and corroborated by landmark analysis. Three clear and distinct pectoral fin structural morphotypes emerge (falceform, gladiform, falcataform), reflecting a diversity of pachycormid lifestyles throughout the Mesozoic, from agile pursuit predator to slow-cruising suspension feeder.

scholarly journals Linking elastic and electrical properties of rocks using cross-property DEM

2021 ◽  
Author(s):  
P A Cilli ◽  
M Chapman
Keyword(s):  
Electrical Properties ◽  
Aspect Ratio ◽  
Elastic Properties ◽  
Rock Physics ◽  
Intermediate Step ◽  
Ratio Analysis ◽  
Pore Shape ◽  
Ratio Model ◽  
Property Relations ◽  
Elastic Data

Summary Combining electrical and elastic measurements can be instrumental in lowering the uncertainty of subsurface characterisation. Many commonly used rock physics relations for joint electrical-elastic properties are at least partly empirical, and often rely on the estimation of porosity as an intermediate step. We combine differential effective medium schemes which relate respectively elastic and electrical properties to porosity and pore shape. The resulting expressions are independent of porosity, depending only on pore aspect ratio. Analysis of published joint electrical-elastic data shows that a single aspect ratio model performs well for clean sandstones, allowing us to model Vp/Vs ratios as a function of resistivity. Clay-bearing sandstones are more complex, but our modelling can still identify the correct trends. We speculate about the potential to extend our approach to produce additional cross-property relations.

Moment ratio analysis of multiple breath nitrogen washout in infants with lung disease

2000 ◽  
Vol 15 (6) ◽  
pp. 1094 ◽  
Author(s):  
A. Schibler ◽  
M. Schneider ◽  
U. Frey ◽  
R. Kraemer
Keyword(s):  
Lung Disease ◽  
Ratio Analysis ◽  
Nitrogen Washout ◽  
Moment Ratio
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