scholarly journals STREAMED VERTICAL RECTANGLE DETECTION IN TERRESTRIAL LASER SCANS FOR FACADE DATABASE PRODUCTION

2012 ◽  
Vol I-3 ◽  
pp. 99-104 ◽  
Author(s):  
J. Demantké ◽  
B. Vallet ◽  
N. Paparoditis
Keyword(s):  
Vertical Rectangle ◽  
Rectangle Detection

Revealing Mechanical Strength of Nanopores Using Atomic Finite Element Techniques

2018 ◽  
Vol 934 ◽  
pp. 24-29
Author(s):  
Prapasiri Pongprayoon ◽  
Attaphon Chaimanatsakun
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Fluid Flow ◽  
Mechanical Strength ◽  
Impact Force ◽  
Pore Surface ◽  
Vertical Rectangle ◽  
The Impact ◽  
Graphene Nanopore

Graphene nanopore has been widely employed in nanofilter or nanopore devices due to its outstanding properties. The understanding of its mechanical properties at nanoscale is crucial for device improvement. In this work, the mechanical properties of graphene nanopore is thus investigated using atomistic finite element method (AFEM). Four graphene models with different pore shapes (circular (CR), horizontal rectangle (RH), and vertical rectangle (RV)) in sub-nm size which could be successfully fabricated experimentally have been studied here. The force normal to a pore surface is applied to mimic the impact force due to a fluid flow. Increasing pore size results in the reduction in its strength. Comparing among different pore shapes with comparable sizes, the order of pore strength is CR>RH>RV>SQ. In addition, we observe that the direction of pore alignment and geometries of pore edge also play a key role in mechanical strength of nanopores.

scholarly journals Out-Boundary Rectangle Detection in Comic Images Using the Gradient Radon Transform

2011 ◽  
Vol 14 (4) ◽  
pp. 538-545 ◽  
Author(s):  
Dong-Keun Kim ◽  
Seung-Beom Yang ◽  
Chi-Jung Hwang
Keyword(s):  
Radon Transform ◽  
Rectangle Detection

Vibration attenuation and bandgap characteristics in plates with periodic cavities

2020 ◽  
pp. 107754632093374
Author(s):  
Sachchidanand Das ◽  
Kush Dwivedi ◽  
Sabareesh Geetha Rajasekharan ◽  
Yendluri V Daseswara Rao
Keyword(s):  
Dispersion Analysis ◽  
Dimensional Structure ◽  
Width Ratio ◽  
Reflected Wave ◽  
Vertical Rectangle ◽  
Vibration Attenuation ◽  
Vibration Responses ◽  
Vibration Shaker ◽  
Attenuation Characteristics ◽  
Selection Of

Plates with periodic cavities show excellent vibration attenuation characteristics. This behavior can be attributed to the presence of frequency bandgaps on account of interference between the incident wave and the reflected wave from the cavities. The present work investigates the vibration attenuation/bandgap characteristics of plates with varying shapes of periodic cavities, such as square, circular, vertical rectangle, and horizontal rectangle, through experiments and simulation. Vibration responses of different periodic plates have been studied by carrying out frequency sweep on a vibration shaker. The investigation has been restricted to flexural vibrations of the plates, which are the predominant mode of vibration in many practical vibration scenarios. The frequency bandgaps, observed through the experiment, have been compared with the numerical simulation by harmonic analysis and by carrying out dispersion analysis on a unit cell of the periodic structure using Floquet–Bloch theory. Dispersion curves of the periodic plates yielded bandgaps, which were observed to be in agreement with the bandgaps from the experiment. The effect of variation in the aspect ratio of the cavities, that is length-to-width ratio, on the bandgaps has also been examined. It has been demonstrated that by suitable selection of the shape/size of the periodic cavity, desired vibration attenuation bandgaps can be realized for a 2-dimensional structure.

Influence of Previous Preferences on the Memory of Octopus Vulgaris After Removal of the Vertical Lobe

1965 ◽  
Vol 43 (3) ◽  
pp. 595-603
Author(s):  
J. Z. YOUNG
Keyword(s):  
Discrimination Training ◽  
Octopus Vulgaris ◽  
Vertical Rectangle ◽  
Do So

1. Octopuses from which the vertical lobe had been removed attacked a vertical rectangle more readily than a horizontal one when both shapes were moved vertically. 2. During discrimination training the results differed markedly according to which figure was rewarded with food. 3. When a vertical rectangle was positive the excess of attacks at this figure increased both within and between sessions, the animals showing considerable ability to learn. 4. When a horizontal rectangle was the positive figure the responses to it were at first ‘paradoxical’, the negative shape being attacked more often. There was then improvement within each session, but little if any between the sessions. 5. Octopuses without the vertical lobe quickly ceased to attack crabs shown at 4 min. intervals when shocks were given for attacks, and the effect could still be detected 4 hr. later. 6. When crabs were shown at 8 min. intervals, and shocks given for attacks, there was no decline in attacks over fourteen trials. Fifteen hours later, however, some residual signs of the shocks were evident when trials were resumed at 8 min. intervals. Although all of the animals at first attacked they soon stopped doing so. After a further 15 hr. all attacked again but soon ceased to do so after receiving shocks. 7. Normal animals, by contrast, all ceased to attack the crabs shown at 8 min. intervals after receiving four or five shocks. The memory is much more retentive in normal animals, so that 2 days after receiving shocks the octopuses seldom attacked the crabs.

Sign in / Sign up

Export Citation Format

Share Document