scholarly journals Coalescence of islands in freely suspended smectic films

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Zoom H. Nguyen ◽  
K. Harth ◽  
A. M. Goldfain ◽  
C. S. Park ◽  
J. E. Maclennan ◽  
...  
Keyword(s):  
Freely Suspended

Dynamics of freely suspended films with surface tension

1990 ◽  
Vol 51 (19) ◽  
pp. 2143-2152 ◽  
Author(s):  
Yatin Marathe ◽  
Sriram Ramaswamy
Keyword(s):  
Surface Tension ◽  
Freely Suspended ◽  
Freely Suspended Films

scholarly journals Annihilation of point defect pairs in freely suspended liquid-crystal films

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Amine Missaoui ◽  
Kirsten Harth ◽  
Peter Salamon ◽  
Ralf Stannarius
Keyword(s):  
Liquid Crystal ◽  
Point Defect ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Freely Suspended

Electromechanical Vibration Study in Freely Suspended Smectic Liquid Crystal

2000 ◽  
Vol 347 (1) ◽  
pp. 111-120
Author(s):  
Toshiyasu Oue ◽  
Hidetaka Nambu ◽  
Keizo Nakayama ◽  
Masanori Ozaki ◽  
Katsumi Yoshino ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Smectic Liquid Crystal ◽  
Freely Suspended

Experimental and Theoretical Nonlinear Dynamic Response of Intact and Cracked Bone-Like Specimens With Various Boundary Conditions

2007 ◽  
Vol 129 (5) ◽  
pp. 541-549 ◽  
Author(s):  
Erick Ogam ◽  
Armand Wirgin ◽  
Z. E. A. Fellah ◽  
Yongzhi Xu
Keyword(s):  
Boundary Conditions ◽  
Duffing Oscillator ◽  
Contact Friction ◽  
Nonlinear Dynamic Response ◽  
Various Boundary Conditions ◽  
Vibration Data ◽  
Element Simulation ◽  
Resonance Frequencies ◽  
Vibration Experiment ◽  
Freely Suspended

The potentiality of employing nonlinear vibrations as a method for the detection of osteoporosis in human bones is assessed. We show that if the boundary conditions (BC), relative to the connection of the specimen to its surroundings, are not taken into account, the method is apparently unable to differentiate between defects (whose detection is the purpose of the method) and nonrelevant features (related to the boundary conditions). A simple nonlinear vibration experiment is described which employs piezoelectric transducers (PZT) and two idealized long bones in the form of nominally-identical drinking glasses, one intact, but in friction contact with a support, and the second cracked, but freely-suspended in air. The nonlinear dynamics of these specimens is described by the Duffing oscillator model. The nonlinear parameters recovered from vibration data coupled to the linear phenomena of mode splitting and shifting of resonance frequencies, show that, despite the similar soft spring behavior of the two dynamic systems, a crack is distinguishable from a contact friction BC. The frequency response of the intact glass with contact friction BC is modeled using a direct steady state finite element simulation with contact friction.

Radial lift on a suspended finite-sized sphere due to fluid inertia for low-Reynolds-number flow through a cylinder

2013 ◽  
Vol 722 ◽  
pp. 159-186 ◽  
Author(s):  
Sukalyan Bhattacharya ◽  
Dil K. Gurung ◽  
Shahin Navardi
Keyword(s):  
Reynolds Number ◽  
Particle Diameter ◽  
Axial Direction ◽  
Perturbation Scheme ◽  
Fluid Inertia ◽  
Regular Perturbation ◽  
Cross Sectional ◽  
First Order ◽  
Reynolds Number Flow ◽  
Freely Suspended

AbstractThis article describes the radial drift of a suspended sphere in a cylinder-bound Poiseuille flow where the Reynolds number is small but finite. Unlike past studies, it considers a circular narrow conduit whose cross-sectional diameter is only $1. 5$–$6$ times the particle diameter. Thus, the analysis quantifies the effect of fluid inertia on the radial motion of the particle in the channel when the flow field is significantly influenced by the presence of the suspended body. To this end, the hydrodynamic fields are expanded as a series in Reynolds number, and a set of hierarchical equations for different orders of the expansion is derived. Accordingly, the zeroth-order fields in Reynolds number satisfy the Stokes equation, which is accurately solved in the presence of the spherical particle and the cylindrical conduit. Then, recognizing that in narrow vessels Stokesian scattered fields from the sphere decrease exponentially in the axial direction, a simpler regular perturbation scheme is used to quantify the first-order inertial correction to hydrodynamic quantities. Consequently, it is possible to obtain two results. First, the sphere is assumed to follow the axial motion of a freely suspended sphere in a Stokesian condition, and the radial lift force on it due to the presence of fluid inertia is evaluated. Then, the approximate motion is determined for a freely suspended body on which net hydrodynamic force including first-order inertial lift is zero. The results agree well with the available experimental results. Thus, this study along with the measured data would precisely describe particle dynamics inside narrow tubes.

Smectic C to smectic A transition induced mechanically by the rupture of freely suspended liquid crystal films

Soft Matter ◽  
2017 ◽  
Vol 13 (17) ◽  
pp. 3199-3204 ◽  
Author(s):  
Torsten Trittel ◽  
Kirsten Harth ◽  
Ralf Stannarius
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Smectic A ◽  
Smectic C ◽  
Crystal Films ◽  
Freely Suspended

X‐ray structural studies of freely suspended ordered hydrated DMPC multimembrane films

1990 ◽  
Vol 92 (7) ◽  
pp. 4519-4529 ◽  
Author(s):  
G. S. Smith ◽  
E. B. Sirota ◽  
C. R. Safinya ◽  
R. J. Plano ◽  
N. A. Clark
Keyword(s):  
Structural Studies ◽  
X Ray ◽  
Freely Suspended
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