Results 251 to 260 of about 4,107,894 (287)
Some of the next articles are maybe not open access.
Quasicrystallinity in twist-grain-boundary phases
Physical Review Letters, 1991We present a simplified polymer model for twist-grain-boundary phases in liquid crystals. The thermodynamic phases or this model are characterized by an angle 2πα. There are incommensurate phases with a an irrational number and commensurate phases with α=P/Q, with P and Q relatively prime integers. The latter have quasicrystalline symmetry for Q=5 or Q>
, Lubensky, , Tokihiro, , Renn
openaire +2 more sources
Geometric phases in twisted strips
Physics Letters A, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Satija, Indubala I., Balakrishnan, Radha
openaire +2 more sources
Helical Twisting Power of Induced Twisted Smectic C* Phases
Berichte der Bunsengesellschaft für physikalische Chemie, 1987AbstractThe helically structured cholesteric and smectic C* phases have been induced by chiral guest molecules in liquid crystalline host systems exhibiting nematic as well as Scphases. The helical twisting power δ has been measured for those systems: i) In all cases values of δchol> δc*were obtained; ii) in the induced Sc* but not in the ...
H. Stegemeyer +2 more
openaire +1 more source
Observation of a Reentrant Twist Grain Boundary Phase
Physical Review Letters, 2001Physical Review ...
D S, Shankar Rao +4 more
openaire +2 more sources
Investigation of a Twisted Phase between the Cholesteric and the Smectic A Phase
Crystal Research and Technology, 1996AbstractIn a ternary mixture of two liquid crystals and a non‐mesomorphic chiral dopant an intermediate state with an unusual texture was found between the cholesteric and the SA phase which could be identified as a separate twisted mesophase. The reflection wavelength of this mesophase does not change with temperature whereas the transmission of ...
A. Chanishvili +4 more
openaire +1 more source
The five-phase twisted-ring counter circuit
10th IEEE International Conference on Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003, 2004The behavior of the Five-Phase Twisted-Ring Counter (5P-TRC) circuit is analyzed. The circuit produces five individual phased clock signals that exercise a phase difference equal to the half period of the clock. A tree-like structure is built by applying the phased outputs of the circuit to the clock inputs of five replicas of the circuit in order to ...
openaire +1 more source
A Twist‐Bend Nematic Phase Driven by Hydrogen Bonding
Angewandte Chemie International Edition, 2014AbstractThe liquid crystalline phase behavior of 4‐[6‐(4′‐cyanobiphenyl‐4‐yl)hexyloxy]benzoic acid (CB6OBA) and 4‐[5‐(4′‐cyanobiphenyl‐4‐yloxy)pentyloxy]benzoic acid (CBO5OBA) is described. Both acids show an enantiotropic nematic phase attributed to the formation of supramolecular complexes by hydrogen bonding between the benzoic acid units.
Jansze, S.M. +4 more
openaire +2 more sources
The two-phase twisted-ring counter circuit
2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353), 2003The behavior of the two-phase twisted-ring counter (2P-TRC) circuit is analyzed. The circuit produces two individual phased clock signals that exercise a phase difference equal to the half period of the clock. A tree-like structure is built by applying the phased outputs of the circuit to the clock inputs of two replicas of the circuit in order to ...
openaire +2 more sources
Liquid crystal phase shifters with a twist
Applied Physics Letters, 2013The phase-shift per unit-length of microwave radiation passing through a liquid crystal cell is calculated. By using twisted nematics, as compared to the standard homogeneous nematic liquid crystal, the phase-shift per unit-length is increased over the transition region.
C. M. Karwin, K. L. Livesey
openaire +1 more source
On the Twisted Director Field of the Blue Phases
Europhysics Letters (EPL), 1993We study the properties of special double-twist fields with toroidal symmetry on S3. The simplest case corresponds to the unfrustrated field tangent to the Hopf fibration. The excited states are labelled by an integral winding number m. For each value of m we derive a lower bound for the energy.
R Dandoloff, R Mosseri
openaire +1 more source