scholarly journals Wind induces variations in spider web geometry and sticky spiral droplet volume

2013 ◽  
Vol 216 (17) ◽  
pp. 3342-3349 ◽  
Author(s):  
C.-C. Wu ◽  
S. J. Blamires ◽  
C.-L. Wu ◽  
I.-M. Tso
Keyword(s):  
Droplet Volume ◽  
Spider Web ◽  
Web Geometry

scholarly journals In situ three-dimensional spider web construction and mechanics

2021 ◽  
Vol 118 (33) ◽  
pp. e2101296118
Author(s):  
Isabelle Su ◽  
Neosha Narayanan ◽  
Marcos A. Logrono ◽  
Kai Guo ◽  
Ally Bisshop ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Hierarchical Structures ◽  
Spider Webs ◽  
Spider Web ◽  
Web Geometry ◽  
Under Construction ◽  
The Web

Spiders are nature’s engineers that build lightweight and high-performance web architectures often several times their size and with very few supports; however, little is known about web mechanics and geometries throughout construction, especially for three-dimensional (3D) spider webs. In this work, we investigate the structure and mechanics for a Tidarren sisyphoides spider web at varying stages of construction. This is accomplished by imaging, modeling, and simulations throughout the web-building process to capture changes in the natural web geometry and the mechanical properties. We show that the foundation of the web geometry, strength, and functionality is created during the first 2 d of construction, after which the spider reinforces the existing network with limited expansion of the structure within the frame. A better understanding of the biological and mechanical performance of the 3D spider web under construction could inspire sustainable robust and resilient fiber networks, complex materials, structures, scaffolding, and self-assembly strategies for hierarchical structures and inspire additive manufacturing methods such as 3D printing as well as inspire artistic and architectural and engineering applications.

WATER DROPLET EVAPORATION IN A CHAMBER ISOLATED FROM THE EXTERNAL ENVIRONMENT

2020 ◽  
Vol 6 (3) ◽  
pp. 8-22
Author(s):  
KSENIA A. Batishcheva ◽  
ATLANT E. Nurpeiis
Keyword(s):  
Water Vapor ◽  
Evaporation Rate ◽  
External Environment ◽  
Heat Removal ◽  
Droplet Evaporation ◽  
Droplet Volume ◽  
Evaporation Time ◽  
Aluminum Alloy Amg6 ◽  
Evaporation Of Droplets ◽  
Contact Diameter

With an increase in the productivity of power equipment and the miniaturization of its components, the use of traditional thermal management systems becomes insufficient. There is a need to develop drip heat removal systems, based on phase transition effects. Cooling with small volumes of liquids is a promising technology for microfluidic devices or evaporation chambers, which are self-regulating systems isolated from the external environment. However, the heat removal during evaporation of droplets into a limited volume is a difficult task due to the temperature difference in the cooling device and the concentration of water vapor that is unsteady in time depending on the mass of the evaporated liquid. This paper presents the results of an experimental study of the distilled water microdrops’ (5-25 μl) evaporation on an aluminum alloy AMg6 with the temperatures of 298-353 K in an isolated chamber (70 × 70 × 30 mm3) in the presence of heat supply to its lower part. Based on the analysis of shadow images, the changes in the geometric dimensions of evaporating drops were established. They included the increase in the contact diameter, engagement of the contact line due to nano roughening and chemical composition inhomogeneous on the surface (90-95% of the total evaporation time) of the alloy and a decrease in the contact diameter. The surface temperature and droplet volume did not affect the sequence of changes in the geometric dimensions of the droplets. It was found that the droplet volume has a significant effect on the evaporation time at relatively low substrate temperatures. The results of the analysis of droplet evaporation rates and hygrometer readings have shown that reservoirs with salt solutions can be used in isolated chambers to control the concentration of water vapor. The water droplets evaporation time was determined. The analysis of the time dependences of the evaporation rate has revealed that upon the evaporation of droplets in an isolated chamber under the conditions of the present experiment, the air was not saturated with water vapor. The latter did not affect the evaporation rate.

Spider Web-like Flexible Tactile Sensor for Pressure-Strain Simultaneous Detection

2021 ◽  
Author(s):  
Xue-Feng Zhao ◽  
Xiao-Hong Wen ◽  
Peng Sun ◽  
Cheng Zeng ◽  
Meng-Yang Liu ◽  
...  
Keyword(s):  
Simultaneous Detection ◽  
Tactile Sensor ◽  
Spider Web

Abnormal Scene Change Detection from a Moving Camera Using Bags of Patches and Spider-Web Map

2014 ◽  
pp. 1-1 ◽  
Author(s):  
Jun-Wei Hsieh ◽  
Chi-Hung Chuang ◽  
Salah Alghyaline ◽  
Hui-Fen Chiang ◽  
Chao-Hong Chiang
Keyword(s):  
Change Detection ◽  
Scene Change ◽  
Scene Change Detection ◽  
Moving Camera ◽  
Spider Web ◽  
Web Map

scholarly journals Spider Web-Shaped Photonic Crystal Fiber for THz Wave Propagation

2021 ◽  
pp. 100137
Author(s):  
Yanan Wang ◽  
Guangyu Jiang ◽  
Zijian Yu ◽  
Qingke Wang ◽  
Xiaoman Jiang
Keyword(s):  
Wave Propagation ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Spider Web ◽  
Thz Wave ◽  
Crystal Fiber

scholarly journals Spider‐Web and Ant‐Tentacle Doubly Bio‐Inspired Multifunctional Self‐Powered Electronic Skin with Hierarchical Nanostructure

2021 ◽  
pp. 2004377
Author(s):  
Ouyang Yue ◽  
Xuechuan Wang ◽  
Xinhua Liu ◽  
Mengdi Hou ◽  
Manhui Zheng ◽  
...  
Keyword(s):  
Spider Web ◽  
Hierarchical Nanostructure ◽  
Electronic Skin ◽  
Self Powered
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