86 research outputs found
Shock-free ferroelectric liquid crystal displays with high optical contrast
Shock-free ferroelectric liquid crystal displays with high optical contrast and low operating voltage are the concern of this contribution. Ferroelectric liquid crystal compositions with a wide temperature range of the chiral smectic C phase are designed. The inο¬uence of the chiral fragments of the molecules, especially their length, on the mechanical stability of the SmC phase has been investigated. The relation between the surface anchoring energy of the aligning polymer and the viscoelastic properties of the SmC phase has been described. Our qualitative model reο¬ects the resistance of the SmC layer structure against mechanical and thermal action
Chemical and electrochemical formation of nanostructured aluminium mesh for display applications
Π‘ΠΈΠ½ΡΠ΅Π· 3,6-Π΄ΠΈΠ·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ ΡΠΈΠΊΠ»ΠΎΠ³Π΅ΠΊΡΠ΅Π½ΠΎΠ½ΠΎΠ² ΠΈ ΠΌΠ΅Π·ΠΎΠΌΠΎΡΡΠ½ΡΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΈΡ Π°ΡΠΎΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΡ
The synthesis of 3,6-disubstituted cyclohex-2-Π΅nones, their aromatization by phosphorous pentachloride and preparation of liquid crystalline compounds with high birefringence have been described. The mesomorphic properties of substituted terphenyls and quaterphenyls and their practical application in displays are discussed.ΠΡΡΡΠ΅ΡΡΠ²Π»Π΅Π½Ρ ΡΠΈΠ½ΡΠ΅Π· ΠΈ Π°ΡΠΎΠΌΠ°ΡΠΈΠ·Π°ΡΠΈΡ 3,6-Π΄ΠΈΠ·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
ΡΠΈΠΊΠ»ΠΎΠ³Π΅ΠΊΡ-2-Π΅Π½ΠΎΠ½ΠΎΠ² ΠΏΠΎΠ΄ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ΠΌ ΠΏΡΡΠΈΡ
Π»ΠΎΡΠΈΡΡΠΎΠ³ΠΎ ΡΠΎΡΡΠΎΡΠ°. Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΆΠΈΠ΄ΠΊΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ² Π°ΡΠΎΠΌΠ°ΡΠΈΠ·Π°ΡΠΈΠΈ, Π΄ΡΡΠ³ΠΈΡ
ΠΌΠ΅Π·ΠΎΠΌΠΎΡΡΠ½ΡΡ
ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΡ
3,6-Π΄ΠΈΠ·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
ΡΠΈΠΊΠ»ΠΎΠ³Π΅ΠΊΡ-2-Π΅Π½ΠΎΠ½ΠΎΠ², ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Ρ ΠΈΡ
ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΠ»Π΅ΠΊΡΡΠΎΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΡΡΠΎΠΉΡΡΠ²Π°Ρ
ΠΎΡΠΎΠ±ΡΠ°ΠΆΠ΅Π½ΠΈΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ
ΠΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΡΠΈΠ½ΡΠ΅Π·Π° Π·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ 2-ΠΌΠ΅ΡΠΈΠ»Π±Π΅Π½Π·ΠΎΡΡΡΠ°Π½ΠΎΠ²
The efficient method for synthesis of substituted 2-methylbenzofurans based on aromatization of 3-substituted-6-allylcyclohex-2-Π΅nones in the presence of iodine with subsequent potassium hydroxide treatment of 2-iodomethyl-2,3-dihydro-benzofuran intermediates, has been described.ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ ΡΠΈΠ½ΡΠ΅Π·Π° Π·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
2-ΠΌΠ΅ΡΠΈΠ»Π±Π΅Π½Π·ΠΎΡΡΡΠ°Π½ΠΎΠ², ΠΎΡΠ½ΠΎΠ²Π°Π½Π½ΡΠΉ Π½Π° Π°ΡΠΎΠΌΠ°ΡΠΈΠ·Π°-ΡΠΈΠΈ 3-Π·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
-6-Π°Π»Π»ΠΈΠ»ΡΠΈΠΊΠ»ΠΎΠ³Π΅ΠΊΡ-2-Π΅Π½ΠΎΠ½ΠΎΠ² Π² ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠΈ ΠΈΠΎΠ΄Π°, ΠΏΠΎΡΠ»Π΅Π΄ΡΡΡΠ΅ΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΎΡΠ½ΡΡ
2-ΠΈΠΎΠ΄ΠΌΠ΅ΡΠΈΠ»-2,3-Π΄ΠΈΠ³ΠΈΠ΄ΡΠΎΠ±Π΅Π½Π·ΠΎΡΡΡΠ°Π½ΠΎΠ² Π³ΠΈΠ΄ΡΠΎΠΎΠΊΠΈΡΡΡ ΠΊΠ°Π»ΠΈΡ
Liquid crystal displays and anisotropic materials development in Belarus: present and future
Research, development and production of liquid crystal displays and materials in Belarus are presented. The original methodology of the creation of advanced devices and anisotropic materials is considered. The proposed approach of design of new devices, anisotropic materials and ordered nanostructured surfaces and layers is based on numerous data obtained in the last decades in the study of liquid crystals and ordered fluids; on the regularities of the evolutionary development of natural organic compounds; on the use of the anisotropy of the molecules of polyfunctional compounds for the design of new molecular structures (molecular engineering), films, liquid
crystals, micelles, membranes, etc. and for the creation of anisotropic ensembles of molecules and biological systems
Extinction threshold in the spatial stochastic logistic model: space homogeneous case
We consider the extinction regime in the spatial stochastic logistic model in R^d (a.k.a. BolkerβPacalaβDieckmannβLaw model of spatial populations) using the first-order perturbation beyond the mean-field equation. In space homogeneous case (i.e. when the density is non-spatial and the covariance is translation invariant), we show that the perturbation converges as time tends to infinity; that yields the first-order approximation for the stationary density. Next, we study the critical mortality β the smallest constant death rate which ensures the extinction of the population β as a function of the mean-field scaling parameter Ξ΅>0. We find the leading term of the asymptotic expansion (as Ξ΅β0) of the critical mortality which is apparently different for the cases dβ₯3, dβ=β2, and dβ=β1
Shock-free ferroelectric liquid crystal displays with high optical contrast
Shock-free ferroelectric liquid crystal displays with high optical contrast and low operating voltage are the concern of this contribution. Ferroelectric liquid crystal compositions with a wide temperature range of the chiral smectic C phase are designed. The inο¬uence of the chiral fragments of the molecules, especially their length, on the mechanical stability of the SmC phase has been investigated. The relation between the surface anchoring energy of the aligning polymer and the viscoelastic properties of the SmC phase has been described. Our qualitative model reο¬ects the resistance of the SmC layer structure against mechanical and thermal action
Quasi-Optical Bandpass and Bandstop Filters Based on Open Resonators with Polarization Gratings
- β¦