Surfactant-Induced Formation of Honeycomb Pattern on Micropipette with Curvature Gradient

Langmuir ◽  
2011 ◽  
Vol 27 (9) ◽  
pp. 5410-5419 ◽  
Author(s):  
Xiaoli Jiang ◽  
Tianzhu Zhang ◽  
Lina Xu ◽  
Changling Wang ◽  
Xuefeng Zhou ◽  
...  
Keyword(s):  
Curvature Gradient ◽  
Honeycomb Pattern

scholarly journals Patterns of Gall Bladder Wall Thickening in Dengue Fever: A Mirror of the Severity of Disease

2017 ◽  
Vol 03 (02) ◽  
pp. E76-E81 ◽  
Author(s):  
Jitendra Parmar ◽  
Chander Mohan ◽  
Maulik Vora
Keyword(s):  
Gall Bladder ◽  
Dengue Fever ◽  
Bladder Wall ◽  
Warning Signs ◽  
Severe Dengue ◽  
Wall Thickening ◽  
Severity Of Disease ◽  
Gall Bladder Wall ◽  
Track Pattern ◽  
Honeycomb Pattern

Abstract Background Dengue fever is a major public health problem with an increased incidence in recent years. Gall bladder wall thickening has been reported as one of the most common findings in dengue fever. There is a paucity of literature regarding the various patterns of gall bladder wall thickening in dengue fever and their significance in predicting the severity of disease. Methodology and Significant Findings Out of 93 seropositive patients included in the study, 54 patients with dengue fever had gall bladder wall thickening. 4 patterns of gall bladder wall thickening are demonstrated in this study. A uniform echogenic pattern in 20 patients, striated or tram track pattern in 11 patients, an asymmetric pattern in 2 patients and a honeycombing pattern in 21 patients. The range of patterns of wall thickening included normal wall thickening or uniform echogenic wall thickening in DF without warning signs, a striated or tram track pattern, and a honeycomb pattern in severe DF. Serial ultrasound done on consecutive alternate days revealed a change in the pattern of gall bladder wall thickening according to the severity of disease. Conclusion The present study revealed 4 distinct patterns of gall bladder wall thickening. The uniform echogenic pattern was found to be more prevalent in dengue fever without warning signs, while the honeycomb pattern was found to be more prevalent in severe dengue fever. A change in the pattern of gall bladder wall thickening on subsequent serial ultrasound can predict the severity of the disease.

Corneal Curvature Gradient Map: A New Corneal Topography Map to Predict the Corneal Healing Process

2014 ◽  
Vol 30 (3) ◽  
pp. 202-207 ◽  
Author(s):  
Paolo Vinciguerra ◽  
Cynthia J. Roberts ◽  
Elena Albé ◽  
Mario R. Romano ◽  
Ashraf Mahmoud ◽  
...  
Keyword(s):  
Healing Process ◽  
Corneal Topography ◽  
Corneal Curvature ◽  
Curvature Gradient

scholarly journals Bioinspired triangular patterns for water collection from fog

2019 ◽  
Vol 377 (2150) ◽  
pp. 20190128 ◽  
Author(s):  
Dong Song ◽  
Bharat Bhushan
Keyword(s):  
Pressure Gradient ◽  
Science And Technology ◽  
Laplace Pressure ◽  
Theme Issue ◽  
Droplet Motion ◽  
Triangular Shape ◽  
Conical Shape ◽  
Bioinspired Materials ◽  
Water Collection ◽  
Curvature Gradient

Cacti use spines with conical geometry to transport water to its base. A conical shape with curvature gradient generates a Laplace pressure gradient along the droplet, which is responsible for droplet motion. In this study, the triangular shape was used which also generates a Laplace pressure gradient along the droplet. A bioinspired surface, composed of a hydrophilic triangular pattern surrounded by a rim of superhydrophobic region, was used to transport water collected from the fog on the hydrophilic pattern. The growing droplets start to coalesce into bigger ones. Eventually, they are big enough to touch the superhydrophobic borders, which trigger the transport motion. Droplet mobility and water collection measurements were made on triangular patterns with various geometries to determine the most efficient configurations. Results from this study can be used to enhance the performance of water collection systems from fog. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 2)’.

Nonlinear Optics: Honeycomb Pattern Formation by Laser-Beam Filamentation in Atomic Sodium Vapor

2002 ◽  
Vol 13 (12) ◽  
pp. 29 ◽  
Author(s):  
Ryan S. Bennink ◽  
Vincent Wong ◽  
Alberto M. Marino ◽  
David L. Aronstein ◽  
Robert W. Boyd ◽  
...  
Keyword(s):  
Pattern Formation ◽  
Nonlinear Optics ◽  
Laser Beam ◽  
Sodium Vapor ◽  
Atomic Sodium ◽  
Honeycomb Pattern

Robust and hydrophilic polymeric films with honeycomb pattern and their cell scaffold applications

2009 ◽  
Vol 19 (18) ◽  
pp. 2789 ◽  
Author(s):  
Lei Li ◽  
Caikang Chen ◽  
Jian Li ◽  
Aijuan Zhang ◽  
Xinyu Liu ◽  
...  
Keyword(s):  
Polymeric Films ◽  
Cell Scaffold ◽  
Honeycomb Pattern

scholarly journals Bioinspired conical design for efficient water collection from fog

2019 ◽  
Vol 377 (2150) ◽  
pp. 20190125 ◽  
Author(s):  
Dev Gurera ◽  
Bharat Bhushan
Keyword(s):  
Pressure Gradient ◽  
Laplace Pressure ◽  
Surface Slope ◽  
Water Droplets ◽  
Theme Issue ◽  
Conical Shape ◽  
Gravitational Forces ◽  
Water Collection ◽  
Curvature Gradient ◽  
First Time

Nature is known for using conical shapes to transport the collected water from fog for consumption or storage. The curvature gradient of the conical shape creates a Laplace pressure gradient in the water droplets which drives them towards the region of lower curvature. Linear cones with linearly increasing radii have been studied extensively. A smaller tip angle cone transports water droplets farther because of higher Laplace pressure gradient. Whereas a larger tip angle with a larger surface slope transports water droplets because of higher gravitational forces. In this study, for the first time, a nonlinear cone with a concave profile has been designed with small tip angle and nonlinearly increasing radius to maximize water collection. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 2)’.

Ordered Honeycomb‐Pattern Membrane †

2020 ◽  
Vol 38 (12) ◽  
pp. 1767-1779
Author(s):  
Hua Yuan ◽  
Guangzhen Li ◽  
Enhao Dai ◽  
Guolin Lu ◽  
Xiaoyu Huang ◽  
...  
Keyword(s):  
Honeycomb Pattern

An Experimental Investigation of Flow Characteristics Downstream of Discrete Film Cooling Holes on Turbine Blade Leading Edge

2011 ◽  
Vol 383-390 ◽  
pp. 5553-5560
Author(s):  
Shao Hua Li ◽  
Hong Wei Qu ◽  
Mei Li Wang ◽  
Ting Ting Guo
Keyword(s):  
Turbine Blade ◽  
Film Cooling ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Suction Side ◽  
Wall Region ◽  
Pressure Side ◽  
Blowing Ratio ◽  
Curvature Gradient ◽  
Film Cooling Holes

The gas turbine blade was studied on the condition that the mainstream velocity was 10m/s and the Renolds number based on the chord length of the blade was 160000.The Hot-film anemometer was used to measure the two-dimension speed distribution along the downstream of the film cooling holes on the suction side and the pressure side. The conclusions are as follows: When the blowing ratio of the suction side and the pressure side increasing, the the mainstream and the jet injection mixing center raising. Entrainment flow occurs at the position where the blade surface with great curvature gradient, simultaneously the mixing flow has a wicked adhere to the wall. The velocity gradient of the u direction that on the suction side increase obviously, also the level of the wall adherence is better than the pressure side. With the x/d increasing, the velocity u that on the pressure side gradually become irregularly, also the secondary flow emerged near the wall region where the curvature is great. The blowing ratio on the suction side has a little influence on velocity v than that on the pressure side.

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