Results 1 to 10 of about 1,034 (248)

A Planar Microfluidic Mixer Based on Logarithmic Spirals. [PDF]

J Micromech Microeng, 2012
A passive, planar micromixer design based on logarithmic spirals is presented. The device was fabricated using polydimethylsiloxane soft photolithography techniques, and mixing performance was characterized via numerical simulation and fluorescent microscopy.
Scherr T, Quitadamo C, Tesvich P, Park DS, Tiersch T, Hayes D, Choi JW, Nandakumar K, Monroe WT.   +8 more
europepmc   +7 more sources

Logarithmic spirals and continue triangles [PDF]

Journal of Computational and Applied Mathematics, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
ANATRIELLO, GIUSEPPINA, Vincenzi, Giovanni   +1 more
exaly   +7 more sources

Logarithmic and Archimedean organic crystalline spirals. [PDF]

Nat Commun
Crystals can be found in many shapes but do not usually grow as spirals. Here we show that applying a non-uniform layer of a polymer blend onto slender centimeter-size organic crystals prestrains the crystals into hybrid dynamic elements with spiral shapes that respond reversibly to environmental variations in temperature or humidity by curling ...
Yang X, Lan L, Tahir I, Alhaddad Z, Di Q, Li L, Tang B, Naumov P, Zhang H.   +8 more
europepmc   +4 more sources

Individual preferences for certain types of spirals and the possible role of creativity. [PDF]

Sci Rep
This study explores the appeal of different types of spirals, commonly found in nature, architecture, and art. The first experiment investigated aesthetic appreciation of Archimedean, logarithmic, and golden spirals, considering factors such as size and ...
Hübner R, Goodarzi G.
europepmc   +3 more sources

THE LOGARITHMIC SPIRAL AND ITS SPHERICAL COUNTERPART

Journal of Industrial Design and Engineering Graphics, 2019
Logarithmic spirals are isogonal trajectories of pencils of lines. From a series of geometric consequences, we pick out a few which are relevant for kinematics: When a logarithmic spiral rolls on a line, its asymptotic point traces a straight line. Hence, wheels with the shape of a logarithmic spiral can be used for a stair climbing robot.
Stachel, Hellmuth, Figlioni, Giorgio, Angeles, Jorge   +2 more
doaj   +5 more sources

Quantum Information Flow in Microtubule Tryptophan Networks. [PDF]

Entropy (Basel)
Networks of aromatic amino acid residues within microtubules, particularly those formed by tryptophan, may serve as pathways for optical information flow.
Gassab L, Pusuluk O, Craddock TJA.
europepmc   +2 more sources

Golden spiral or Fibonacci spiral: Which is more beautiful and why? [PDF]

Iperception
Spirals, with their widespread presence in both nature and culture, are universally admired. Although there are different types, such as the Archimedean, logarithmic, and golden spirals, they are indiscriminately considered as beautiful.
Hübner R.
europepmc   +2 more sources

Selectively advantageous instability in biotic and pre-biotic systems and implications for evolution and aging. [PDF]

Front Aging
Rules of biology typically involve conservation of resources. For example, common patterns such as hexagons and logarithmic spirals require minimal materials, and scaling laws involve conservation of energy. Here a relationship with the opposite theme is
Tower J.
europepmc   +2 more sources

Special Curves in Engineering. Surfaces Generated by the Logarithmic Spiral

Modelling in Civil Environmental Engineering, 2022
The logarithmic spiral is one of the most known curves with applications in engineering. We consider product of the logarithmic spiral with a real line and tensor product of two logarithmic spirals and investigate their minimality or flatness.
Broscăţeanu Ștefan Cezar
doaj   +1 more source

Logarithmically spiraling helicoids [PDF]

Communications in Analysis and Geometry, 2018
26 pages, 1 ...
Breiner, Christine, Kleene, Stephen J.
openaire   +2 more sources