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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
exaly +6 more sources
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
doaj +4 more sources
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
A novel logarithmic spiral design for proximal interphalangeal joint arthroplasty [PDF]
Scientific ReportsThis study evaluated a novel implant for proximal interphalangeal (PIP) joint arthroplasty that we designed according to the principles of a logarithmic spiral. The design addresses the limitations of current implants that poorly replicate natural finger
Hitoshi Hirata +5 more
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Factoring the logarithmic spiral
Inventiones Mathematicae, 1988 If f is a K-quasiconformal homeomorphism of Jordan domains in the plane, then for any given \(c>1\), f is equal to some composition of \(N1\). Then it is easy to show that \(s_ k\) is an L-quasi-isometry, i.e., \[ (1/L)| p-q| \leq | s_ k(p)-s_ k(q)| \leq L| p-q|,\quad \forall p,q\in \bar D^ 2.
Zheng-Xu He
exaly +2 more sources
Static Modelling and Analysis of a Novel Movable Tooth Drive with Logarithmic Spiral Tooth Profiles
Machines, 2022 This paper presents a static model for a novel movable tooth drive with logarithmic spiral tooth profiles, to research contact force and load distribution during the meshing period.
Guocheng Zhou, Yuhu Yang
exaly +3 more sources
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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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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Logarithmically spiraling helicoids [PDF]
Communications in Analysis and Geometry, 2018 26 pages, 1 ...
Breiner, Christine, Kleene, Stephen J.
openaire +2 more sources