Results 51 to 60 of about 34,058 (316)

Nonlinear Electro-Hydrodynamics of Liquid Crystals

Journal of Experimental and Theoretical Physics, 2023
We present nonlinear dynamic equations for nematic and smecticAliquid crystals in the presence of an alternating electric field and explain their derivation in detail. The local electric field acting in any liquid-crystalline system is expressed as a sum of external electric field, the fields originating from feedback of liquid crystal order parameter,
Pikina, E. S., Kats, E. I., Muratov, A. R., Lebedev, V. V.   +3 more
openaire   +2 more sources

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

Electrically tunable, optically induced dynamic and permanent gratings in dye-doped liquid crystals [PDF]

, 2002
We report on further experimental studies of the ac field response of transient and permanent gratings written with visible light in both planar and homeotropic, dye-doped liquid crystal cells.
Cudney, Roger S., Kaczmarek, Malgosia, Shih, Min-Yi, Khoo, Iam-Choon   +3 more
core   +1 more source

Broadband, Continuous-Wave, Mid-Infrared Generation Based on ASE Fiber Source

Photonics, 2022
The research reports broadband, continuous-wave (CW), mid-infrared generation based on an optical parametric oscillator (OPO), pumped by an amplified spontaneous emission (ASE) fiber source.
Kaifeng Wang, Xiao Li, Peng Wang, Weihong Hua, Zefeng Wang, Kai Han   +5 more
doaj   +1 more source

Workflow for Design of Experiments‐Based Modeling of Species Transport and Growth Kinetics in GaN Hydride Vapor Phase Epitaxy

Advanced Engineering Materials, EarlyView.
A novel workflow for investigating hydride vapor phase epitaxy for GaN bulk crystal growth is proposed. It combines Design of experiments (DoE) with physical simulations of mass transport and crystal growth kinetics, serving as an intermediate step between DoE and experiments.
J. Tomkovič, G. Lukin, H. Torkashvand, A. Kerschbaum, M. Müller, S. Besendörfer, J. Heitmann, J. Friedrich   +7 more
wiley   +1 more source

Experimental Characterization and Constitutive Modeling of the Effect of Prior Inelastic Strain on the Viscoplastic Behavior of AD730 at 700 °C

Advanced Engineering Materials, EarlyView.
This study shows that superalloys used in aircraft engine disks become much more prone to deformation at high temperatures if they have been strained during manufacturing. This effect increases with the level of prior strain but eventually reaches a limit.
Fabio Machado Alves da Fonseca, Patrick Villechaise, Malik Durand, Arnaud Longuet, Florent Coudon, Loïc Signor, Julien De Jaeger, Dominique Eyidi, Nathalie Bozzolo, Jonathan Cormier   +9 more
wiley   +1 more source

Nonlinear optical characterisation of organic chromophores and aspects of molecular aggregation [PDF]

, 2001
The work presented in this thesis describes an investigation into the properties and behaviour of a new class of nonlinear optical organic chromophores.
Hackman, Nancy-Ann
core  

Uniqueness in the Freedericksz transition with weak anchoring

, 2009
In this paper we consider a boundary value problem for a quasilinear pendulum equation with nonlinear boundary conditions that arises in a classical liquid crystals setup, the Freedericksz transition, which is the simplest opto-electronic switch, the ...
, FCT Portugal (partly supported) (Funder), Grinfeld, Michael, Mottram, N.J., Pinto, J.T., Mottram, Nigel J., Pinto, João T., Da Costa, F.P., da Costa, Fernando P., Grinfeld, M., FCT Portugal (partly supported) (Funder)   +9 more
core   +1 more source

Nonlinear Photonic Crystals

Frontiers in Optics, 2003
1 Introduction.- 2 Theory of Nonlinear Pulse Propagation in Periodic Structures.- 3 Polarization Effects in Birefringent, Nonlinear, Periodic Media.- 4 Raman Gap Solitons in Nonlinear Photonic Crystals.- 5 Self-transparency and Localization in Gratings with Quadratic Nonlinearity.- 6 Photonic Band Edge Effects in Finite Structures and Applications to x(
  +4 more sources

Double-Peaked Mid-Infrared Generation Based on Intracavity Difference Frequency Generation

Applied Sciences, 2022
It was reported that a double-peaked mid-infrared laser was generated based on an intracavity difference frequency generation (DFG). The double-peaked pump source was achieved by suppressing the intensity at the central wavelength of the pump source. The
Kaifeng Wang, Xiao Li, Peng Wang, Meng Wang, Weihong Hua, Kai Han, Zefeng Wang   +6 more
doaj   +1 more source