Results 31 to 40 of about 44,276 (294)

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
doaj   +1 more source

Ultralight Scalars and Spiral Galaxies [PDF]

, 2001
We study some possible astrophysical implications of a very weakly coupled ultralight dilaton-type scalar field. Such a field may develop an (approximately stable) network of domain walls.
Dvali G., GIA DVALI, GREGORY GABADADZE, Hill C. T., Ipser J., M. SHIFMAN, Shifman M., Tully R. B., Voloshin M. B., Zeldovich Ya. B.   +9 more
core   +4 more sources

THE LOGARITHMIC SPIRAL AND ITS SPHERICAL COUNTERPART

Journal of Industrial Design and Engineering Graphics, 2020
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, Giorgio Figliolini, Jorge Angeles   +2 more
doaj   +2 more sources

The Myth of the Molecular Ring

, 2012
We investigate the structure of the Milky Way by determining how features in a spatial map correspond to CO features in a velocity map. We examine structures including logarithmic spiral arms, a ring and a bar.
Burkert, A., Dobbs, C. L.
core   +1 more source

Influence of Vane Structure on Flow Field in Turbo-air Classifier

Shiyou jixie, 2021
Turbo-air classifiers have low classifying precision and efficiency, which are mainly resulted from its internal structure. In this study, based on the air flow trajectory equation, three structural types of guide vanes are designed including straight ...
Yu Dankui, Zhou Zhi, Yan Rensheng, Wu Wenxiu, Zhang Libao, Guo Qiang, Bu Xiangmin   +6 more
doaj  

An Enhanced Hunger Games Search Optimization with Application to Constrained Engineering Optimization Problems

Biomimetics, 2023
The Hunger Games Search (HGS) is an innovative optimizer that operates without relying on gradients and utilizes a population-based approach. It draws inspiration from the collaborative foraging activities observed in social animals in their natural ...
Yaoyao Lin, Ali Asghar Heidari, Shuihua Wang, Huiling Chen, Yudong Zhang   +4 more
doaj   +1 more source

Asymptotics of the entire functions with $\upsilon$-density of zeros along the logarithmic spirals

Karpatsʹkì Matematičnì Publìkacìï, 2019
Let $\upsilon$ be the growth function such that $r\upsilon'(r)/\upsilon (r) \to 0$ as $r \to +\infty$, $l_\varphi^c = \{z=te^{i(\varphi+c \ln t)}, 1 \leqslant t < +\infty\}$ be the logarithmic spiral, $f$ be the entire function of zero order.
M.V. Zabolotskyj, Yu.V. Basiuk
doaj   +1 more source

A new model for gravitational potential perturbations in disks of spiral galaxies. An application to our Galaxy

, 2013
We propose a new, more realistic, description of the perturbed gravitational potential of spiral galaxies, with spiral arms having Gaussian-shaped groove profiles.
Barros, D. A., Braga, C. A. S., Junqueira, T. C., Lépine, J. R. D.   +3 more
core   +1 more source

Patterning the Void: Combining L‐Systems with Archimedean Tessellations as a Perspective for Tissue Engineering Scaffolds

Advanced Functional Materials, EarlyView.
This study introduces a novel multi‐scale scaffold design using L‐fractals arranged in Archimedean tessellations for tissue regeneration. Despite similar porosity, tiles display vastly different tensile responses (1–100 MPa) and deformation modes. In vitro experiments with hMSCs show geometry‐dependent growth and activity. Over 55 000 tile combinations
Maria Kalogeropoulou, Kenny A. van Kampen, Pierpaolo Fucile, Carlos Mota, Lorenzo Moroni   +4 more
wiley   +1 more source

The spiral structure of our Milky Way Galaxy

, 2009
The spiral structure of our Milky Way Galaxy is not yet known. HII regions and giant molecular clouds are the most prominent spiral tracers. We collected the spiral tracer data of our Milky Way from the literature, namely, HII regions and giant molecular
Anderson, Araya, Blum, Brand, Brand, Bronfman, Carpenter, Caswell, Clemens, Cohen, Condon, Copetti, Crowther, Dame, Dame, Dawson, Digel, Digel, Digel, Downes, Eisenhauer, Englmaier, Fich, Fish, Georgelin, Ghez, Gillessen, Grabelsky, Gregory, Griffith, Griffith, Groenewegen, Gómez, Heyer, J. L. Han, Kolpak, Kuchar, L. G. Hou, Leahy, Levine, May, Mead, Nakagawa, Naoz, Paladini, Paladini, Pandian, Puerari, Reid, Russeil, Russeil, Schraml, Seigar, Sewilo, Sodroski, Solomon, Tian, Tian, Tian, Vallée, W. B. Shi, Watson, Wright, Wright, Xu   +64 more
core   +1 more source