Web Geometry

1989 ◽  
pp. 51-58
Author(s):  
Shiing-Shen Chern
Keyword(s):  
Web Geometry

Design Variability in Web Geometry of an Orb-Weaving Spider

1997 ◽  
Vol 62 (4) ◽  
pp. 735-743 ◽  
Author(s):  
Fritz Vollrath ◽  
Mike Downes ◽  
Sven Krackow
Keyword(s):  
Web Geometry

scholarly journals A comparison of morphology and web geometry between hypogean and epigean species of Metellina orb spiders (family Tetragnathidae)

2019 ◽  
Vol 32 ◽  
pp. 1-13 ◽  
Author(s):  
Thomas Hesselberg ◽  
Daniel Simonsen
Keyword(s):  
Life Style ◽  
Foraging Behaviour ◽  
Behavioural Flexibility ◽  
Permanent Record ◽  
Behavioural Adaptation ◽  
Web Geometry ◽  
Web Building

Studies on the behaviour of subterranean animals are rare, mainly due to the problems with collecting data in these inaccessible habitats. Web-building cave spiders, however, leave a semi-permanent record of their foraging behaviour, which can relatively easily be recorded. In this study, we compare size, leg lengths and web characteristics between hypogean populations of Metellina merianae with its close wood-inhabiting relative M. mengei. We confirm previous observations that M. merianae does not show any obvious morphological and behavioural adaptions to a subterranean life-style, although individuals of the cave species were significantly larger and had webs with relatively fewer radii and capture spiral turns than M. mengei. We were, however, not able to determine if these findings indicate a transition towards behavioural adaptation to caves or if they are a result of behavioural flexibility in response to the different humidity and temperature between caves and woodland. Finally, we did not find any effect of cave characteristics on either the number of radii or the area of the M. merianae web.

Web geometry

2007 ◽  
pp. 253-267
Keyword(s):  
Web Geometry

scholarly journals On an Algebraical Computation of the Tensor and the Curvature for 3-Web

ISRN Geometry ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-25
Author(s):  
Thomas B. Bouetou
Keyword(s):  
Lie Groups ◽  
Algebraic Method ◽  
Algebraic Methods ◽  
Web Geometry ◽  
Local Loops ◽  
The Web

The algebraic methods are used in the web geometry, in particular in the 3-web. Along the line, we suggest a new, alternative algebraic method for computation of the quantities ∇l1ajki, ∇l2ajki, and djklmi by means of the embedding of local loops into Lie groups.

Olfactory cues from conspecifics inhibit the web-invasion behavior of Portia, web-invading araneophagic jumping spiders (Araneae: Salticidae)

1993 ◽  
Vol 71 (7) ◽  
pp. 1415-1420 ◽  
Author(s):  
Marianne B. Willey ◽  
Robert R. Jackson
Keyword(s):  
Olfactory Cues ◽  
Adult Males ◽  
Aggressive Mimicry ◽  
Jumping Spiders ◽  
Web Geometry ◽  
Adult Females ◽  
Conspecific Adult ◽  
Invasion Behavior ◽  
Courtship Displays ◽  
The Web

Portia is a genus of web-invading araneophagic spiders that use aggressive mimicry to capture their spider prey. In an experimental study, we demonstrate that adult females of Portia africana, P. fimbriata, P. labiata, and P. schultzi produce olfactory cues that affect the behavior of conspecific adult males, adult females, and juveniles. The olfactory cues of Portia spp. inhibit aggressive mimicry of conspecific spiders that are on a prey spider's web even if the prey spider is visible. This inhibition occurs regardless of the prey spider's web geometry. Prey pursuit by Portia is also inhibited when conspecific females provide olfactory cues in cases where the prey is a spider inhabiting a web. Olfactory cues from adult females elicit courtship displays of conspecific males when males are on the prey spider's web. Portia spp. do not alter their behavior when exposed to olfactory cues of heterospecifics.

An Invitation to Web Geometry

2015 ◽  
Author(s):  
Jorge Vitório Pereira ◽  
Luc Pirio
Keyword(s):  
Web Geometry

Web Geometry of a System of First-Order Autonomous Ordinary Differential Equations

2014 ◽  
Vol 21 (4) ◽  
pp. 655-663
Author(s):  
Mehdi Nadjafikhah ◽  
Rohollah Bakhshandeh-Chamazkoti
Keyword(s):  
Differential Equations ◽  
Ordinary Differential Equations ◽  
First Order ◽  
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.

scholarly journals Influence of Corrugated Web Geometry on Mechanical Properties of I-beam: Laboratory Tests

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 277
Author(s):  
Marcin Górecki ◽  
Krzysztof Śledziewski
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Failure Modes ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Web Geometry ◽  
Four Point Bending ◽  
Corrugated Webs ◽  
Corrugated Web

This paper presents the results of experimental investigations performed on beams with corrugated webs. The aim of the research was to determine the effect of the geometric parameters of the sinusoidal web on the behavior of I-beams subjected to four-point bending. Special attention was paid to the effects of web thickness and wave geometry on the deflection of beams. The obtained failure modes of particular test samples are presented. Reference has also been made to the determined standard load capacities based on Annex D of the EC3 standard. In order to compare the performance of beams with corrugated webs, the results for beams with flat webs of the same thickness of web sheets are also presented.

scholarly journals The Web Geometry Laboratory Project

2013 ◽  
pp. 364-368 ◽  
Author(s):  
Pedro Quaresma ◽  
Vanda Santos ◽  
Seifeddine Bouallegue
Keyword(s):  
Web Geometry ◽  
The Web
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