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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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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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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.
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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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A modified logarithmic spiral method for determining passive earth pressure
Journal of Rock Mechanics and Geotechnical Engineering, 2018 In this study, a modified logarithmic spiral method is proposed to determine the passive earth pressure and failure surface of cohesionless sloping backfill, with presence of wall–soil interface friction.
Shiyi Liu
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A “Logarithmic Spiral” in the Brain: Images of an Intracranial Dermoid Cyst
Translational Neuroscience and Clinics, 2016 A logarithmic spiral is a self-similar spiral curve, which often appears in nature, e.g., mollusk shells. In the normal tissues of the human body, the cochlea is also an approximate logarithmic spiral. However, approximate logarithmic spirals are rarely,
Meiqing Lou, Yaodong Zhao
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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 +2 more
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Logarithmic spiral trajectories generated by Solar sails
Celestial Mechanics and Dynamical Astronomy, 2018 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Marco Bassetto +2 more
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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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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,
Hellmuth STACHEL +2 more
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