scholarly journals Micromixer with Fine-Tuned Mathematical Spiral Structures

ACS Omega ◽  
2021 ◽  
Author(s):  
Binfeng Yin ◽  
Wenkai Yue ◽  
A. S. M. Muhtasim Fuad Sohan ◽  
Teng Zhou ◽  
Changcheng Qian ◽  
...  
Keyword(s):  
Spiral Structures

Galactic Spiral Pattern beyond the Optical Size Induced by the Triaxial Dark Halo

2015 ◽  
Vol 24 (2) ◽  
Author(s):  
M. Butenko ◽  
A. Khoperskov ◽  
S. Khoperskov
Keyword(s):  
Dark Halo ◽  
Spiral Pattern ◽  
Spiral Structures ◽  
Galactic Spiral

AbstractWe suggest a possible mechanism for the formation of non-tidal gaseous structures in galactic outskirts. According to recent observations, extended spiral structures are detected beyond the optical radii

Where do running penumbral waves emerge in chromosphere?

2018 ◽  
Vol 13 (S340) ◽  
pp. 155-156
Author(s):  
T. G. Priya ◽  
Jiangtao Su ◽  
Robertus Erd̎elyi
Keyword(s):  
Active Region ◽  
Active Region Noaa ◽  
Long Period ◽  
Wave Guides ◽  
Spiral Structures ◽  
Region Noaa ◽  
Umbral Oscillations

AbstractThe earlier work on the oscillatory phenomena in sunspot structures have supported in validating the detection of long-period oscillations, which are generated by the photospheric umbral response to the five minute p-mode global oscillations. We report here on the events of 3- min umbral oscillations which are detected within a duration of one hour from a single-polarity sunspot of active region NOAA 12132. The umbral oscillations that appear first around umbral boundaries is speculated to be excited by the wavefronts at the umbral-penumbral boundaries due to sub-photospheric or photospheric granular buffetings. The appearance of the wavefronts in spiral structures suggests that the wave guides are twisted. In addition, the newly formed running penumbral waves (RPWs) appears to be connected with the preceding RPWs.

scholarly journals Threefold Spiral Structure Constructed by 1D Chains of [[M(NCS)2(bpa)2]·biphenyl]n (M = Fe, Co; bpa = 1,2-bis(4-pyridyl)ethane)

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 97 ◽  
Author(s):  
Satoshi Tokinobu ◽  
Haruka Dote ◽  
Satoru Nakashima
Keyword(s):  
Spin Crossover ◽  
Spiral Structure ◽  
Diffusion Method ◽  
Central Metal ◽  
X Ray ◽  
Pyridine Complex ◽  
1D Chain ◽  
One Step ◽  
Spiral Structures ◽  
1D Chains

Assembled complexes [[M(NCS)2(bpa)2]·biphenyl]n (M = Fe, Co; bpa = 1,2-bis(4-pyridyl)ethane) have been synthesized because [Fe(NCBH3)2(bpa)2·biphenyl]n has a novel threefold spiral structure and shows stepwise spin-crossover phenomenon. We attempted to obtain spiral structures for [[Fe(NCS)2(bpa)2]·biphenyl]n and [[Co(NCS)2(bpa)2]·biphenyl]n using a one-step diffusion method, while the reported spiral structure of [[Fe(NCBH3)2(bpa)2]·biphenyl]n was obtained by diffusion method after synthesizing Fe(II)-pyridine complex. X-ray structural analysis revealed that [[Fe(NCS)2(bpa)2]·biphenyl]n and [[Co(NCS)2(bpa)2]·biphenyl]n had a chiral propeller structure of pyridines around the central metal, and they had a novel spiral structure and chiral space group P3121 without the presence of chiral auxiliaries. It was shown that the host 1D chain, having a chiral propeller structure of pyridines around the central metal along with its concerted interaction with an atropisomer of biphenyl, made a threefold spiral structure.

Orthogonal spiral structures for energy harvesting applications: Theoretical and experimental analysis

2018 ◽  
Vol 29 (9) ◽  
pp. 1900-1912 ◽  
Author(s):  
Auteliano Antunes Dos Santos ◽  
Jared D. Hobeck ◽  
Daniel J Inman
Keyword(s):  
Energy Harvesting ◽  
Cantilever Beam ◽  
Microelectromechanical Systems ◽  
Spiral Structure ◽  
Structure Design ◽  
Lumped Parameter Model ◽  
Archimedean Spiral ◽  
Reduced Frequency ◽  
Harvesting Systems ◽  
Spiral Structures

The capture of energy from vibration of mechanical systems has been extensively studied with the goal of providing power for various microelectromechanical systems. The traditional cantilever beam approach was used as a starting design for more complex, multiple-beam structures like zigzag or spiral geometries. This work presents the orthogonal spiral structure, an alternative compact periodic structure for reduced frequency energy harvesting. The proposed orthogonal spiral structure design is inspired by a combination of zigzag and Archimedean spiral geometries. The orthogonal spiral structure takes advantage of a simple cantilever beam-based design as with the zigzag, but includes the compact concentric-type design of an Archimedean spiral. First, the fundamental frequency is estimated using a lumped parameter model for the substrate beam and the results are compared with experimental results for two different sizes of orthogonal spiral structures. Then, the same model is updated to include a layer of piezoelectric material and used to identify the strain nodes along each beam obtained from the first mode shape. Finally, electromechanical modeling is developed allowing for the evaluation of the energy harvested from base excitations. The results show that the orthogonal spiral structure can be used as an alternative to current energy harvesting systems for micro scale applications.

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