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Logarithmic and Archimedean organic crystalline spirals [PDF]
Nature CommunicationsCrystals 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 ...
Xuesong Yang +8 more
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The Logarithmic Spiral Neutron Guide [PDF]
Instruments, 2020 We present a neutron guide which is curved in the shape of a logarithmic spiral. Simulations and calculations for such a spiral guide are presented and the potential use of the guide for a reflectometer is investigated and compared to the conventional ...
Christine Klauser, Jochen Stahn
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Broadband Microwave Absorption by Logarithmic Spiral Metasurface. [PDF]
Sci Rep, 2019 AbstractMetamaterials have enabled the design of electromagnetic wave absorbers with unprecedented performance. Conventional metamaterial absorbers usually employ multiple structure components in one unit cell to achieve broadband absorption. Here, a simple metasurface microwave absorber is proposed that has one metal-backed logarithmic spiral ...
Wang S, Hou B, Chan CT.
europepmc +6 more sources
Spiral-logarithmic structures in a Heisenberg ferromagnet [PDF]
Journal of Experimental and Theoretical Physics Letters, 2001 Spiral-logarithmic structure is suggested as a stationary solution of a modified equation for the Heisenberg model, and the single- and N-soliton solutions are constructed on this base.
Gutshabash, E. Sh.
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Research on upper bound limit analysis of slope stability in open-pit mine based on least square principle [PDF]
HeliyonSo as to extend the application of upper bound limit analysis for slope stability in open-pit mine, this paper analyzed failure mechanism of rock mass when shear failure occurred based on plastic mechanics principles, and combined with discrete ...
Zhen Wang, Ang Li, Tianhao Yang
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Individual preferences for certain types of spirals and the possible role of creativity [PDF]
Scientific ReportsThis 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 ...
Ronald Hübner, Golfam Goodarzi
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The logarithmic spiral, autoisoptic curve [PDF]
, 2010 In the Line of Investigation that in the department of “Technical Drawing” in the School of Agriculture Engineering of Madrid, we carry out on the study of The Technical Curves and his singularities, we demonstrate an interesting property of the Logarithmic Spiral.
Puerta Romero, Francisco +4 more
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Golden spiral or Fibonacci spiral: Which is more beautiful and why? [PDF]
i-PerceptionSpirals, 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.
Ronald Hübner
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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
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On the plausible origins of the spiral character of galaxies
Open Astronomy, 2021 We here-in demonstrate that the proposed hitherto unknown gravitomagnetic dark-force that hypothetically explains the Flat Rotation Curves of Spiral Galaxies — this same force, explains very well, the logarithmic and as-well, the barred spiral shapes of ...
Nyambuya Golden Gadzirayi
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