Results 21 to 30 of about 44,276 (294)

Numerical Study of Shock Wave Attenuation in Two-Dimensional Ducts Using Solid Obstacles: How to Utilize Shock Focusing Techniques to Attenuate Shock Waves

Aerospace, 2015
Research on shock wave mitigation in channels has been a topic of much attention in the shock wave community. One approach to attenuate an incident shock wave is to use obstacles of various geometries arranged in different patterns. This work is inspired
Qian Wan, Veronica Eliasson
doaj   +1 more source

Logarithmic spirals and continue triangles

Journal of Computational and Applied Mathematics, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
ANATRIELLO, GIUSEPPINA, Vincenzi, Giovanni   +1 more
openaire   +4 more sources

Research on logarithmic spiral roll profile in hot rolling

Metalurgija, 2022
Presented is a new logarithmic spiral roll profile for 2-high hot rolling,and successfully establishing the logarithmic spiral roll profile equation.The inherent benefits over traditional sine curve roll profile include control of rolling force and ...
F. B. Lian, S. W. Wang, H. Song, M. X. Gao, J. Yang, Y. Zhang, L. H. Fu   +6 more
doaj  

A universal power law for modelling the growth and form of teeth, claws, horns, thorns, beaks, and shells

BMC Biology, 2021
Background A major goal of evolutionary developmental biology is to discover general models and mechanisms that create the phenotypes of organisms. However, universal models of such fundamental growth and form are rare, presumably due to the limited ...
Alistair R. Evans, Tahlia I. Pollock, Silke G. C. Cleuren, William M. G. Parker, Hazel L. Richards, Kathleen L. S. Garland, Erich M. G. Fitzgerald, Tim E. Wilson, David P. Hocking, Justin W. Adams   +9 more
doaj   +1 more source

The design and manufacture of a conformal conical spiral antenna with four-arm for position measurement

Xi'an Gongcheng Daxue xuebao, 2021
In order to solve the problem of insufficient carrier space caused by the antenna loaded inside the conical seeker, the conformal four arm conical spiral antenna which applied to the main frequency of 1.575 GHz satellite positioning communication system ...
Wei SHEN, Sen WANG, Lijian ZHANG, Hao YANG, Xixiang WANG, Lei LEI   +5 more
doaj   +1 more source

Influence of Blade Profiles on Plastic Centrifugal Pump Performance

Advances in Materials Science and Engineering, 2020
To study the influence of blade profiles of the plastic centrifugal pump on pump performance, the impeller blade profiles were designed and drawn by the single arc method, double arc method, logarithmic spiral method, and B-spline curve method ...
Hui Zhang, Lingfeng Tang, Yongtao Zhao
doaj   +1 more source

A Relativistic Entropic Hamiltonian–Lagrangian Approach to the Entropy Production of Spiral Galaxies in Hyperbolic Spacetime

Universe, 2021
Double-spiral galaxies are common in the Universe. It is known that the logarithmic double spiral is a Maximum Entropy geometry in hyperbolic (flat) spacetime that well represents an idealised spiral galaxy, with its central supermassive black hole (SMBH)
Michael C. Parker, Chris Jeynes
doaj   +1 more source

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.
He, Zheng-Xu, Freedman, Michael H.
openaire   +1 more source

Simulations of the grand design galaxy M51: a case study for analysing tidally induced spiral structure [PDF]

, 2009
We present hydrodynamical models of the grand design spiral M51 (NGC 5194), and its interaction with its companion NGC 5195. Despite the simplicity of our models, our simulations capture the present day spiral structure of M51 remarkably well, and even ...
Agertz, Balbus, Bate, Bate, Bate, Bate, Benz, Bertin, Binney, Blitz, Bottema, Buta, Byrd, Byrd, C. L. Dobbs, C. Theis, Chakrabarti, Chamberlin, Corder, Cox, De Avillez, Dobbs, Dobbs, Dobbs, Dobbs, Dobbs, Dobbs, Donner, Egusa, Elmegreen, Elmegreen, Elmegreen, Elmegreen, Elmegreen, Feitzinger, Gittins, Goldreich, Goldreich, Hernquist, Hitschfeld, J. E. Pringle, Jog, Julian, Jáchym, Kendall, Kim, Koda, Kormendy, Kuijken, La Vigne, Li, Lin, Lin, M. R. Bate, Mark, Martínez-García, Meidt, Merrifield, Monaghan, Oh, Patrikeev, Patsis, Petit, Petsch, Pierce, Press, Price, Price, Price, Price, Price, Rand, Renaud, Roberts, Robertson, Romeo, Rots, Salo, Salo, Schinnerer, Sellwood, Shetty, Shetty, Shetty, Slyz, Sofue, Springel, Springel, Sundelius, Tamburro, Tasker, Tasker, Theis, Theis, Tilanus, Toomre, Toomre, Toomre, Toomre, Toomre, Tosaki, Tully, Vogel, Wada, Wada, Westpfahl, Yáñez, Zaritsky   +107 more
core   +3 more sources

Parametric surface and properties defined on parallelogrammic domain [PDF]

, 2014
Similar to the essential components of many mechanical systems, the geometrical properties of the teeth of spiral bevel gears greatly influence the kinematic and dynamic behaviors of mechanical systems.
Fan, Shuqian, Shi, Mingquan, Zou, Jinsong   +2 more
core   +2 more sources