High Performance Liquid Crystals for Laser Communications

2001 ◽  
Author(s):  
Shin-Tson Wu
Keyword(s):  
Liquid Crystals ◽  
High Performance ◽  
Laser Communications

scholarly journals Validation of high-performance liquid chromatographic method for analysis of fluconazole in microemulsions and liquid crystals

2014 ◽  
Vol 50 (2) ◽  
pp. 381-389 ◽  
Author(s):  
Hilris Rocha e Silva ◽  
Fernanda Kolenyak dos Santos ◽  
Gabriela Marielli da Luz ◽  
Marlus Chorilli ◽  
Maria Palmira Daflon Gremião
Keyword(s):  
Liquid Crystals ◽  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Fungal Diseases ◽  
Cutaneous Lesions ◽  
Ich Guidelines ◽  
Liquid Chromatographic Method ◽  
Site Of Action ◽  
Copaiba Oil ◽  
Liquid Chromatographic

In recent decades, there has been a significant increase in the incidence of fungal diseases. Certain fungal diseases cause cutaneous lesions and in the usual treatment, generally administred orally, the drug reaches the site of action with difficulty and its concentration is too low. An approach much explored in recent years is the development of nanotechnology-based drug delivery systems, and microemulsions (ME) and liquid crystals (LC) are promising. ME and LC were developed with oleic acid or copaiba oil as the oil phase, propoxyl (5OP) ethoxyl (20 OE) cetyl alcohol as surfactant and water. An analytical method to assess the incorporation of fluconazole (FLU) in the systems under study was validated according to guidelines of the International Conference on Harmonization (ICH) guidelines and the Brazilian Food, Drug and Sanitation Agency (ANVISA). The method was conducted on a C18-RP column (250 × 4.6 mm i.d.), maintained at room temperature. The mobile phase consisted of acetonitrile and water (50:50, v/v), run at a flow rate of 1.0mL/min and using ultraviolet detection at 210nm. The chromatographic separation was obtained with a retention time of 6.3min, and was linear in the range of 20-400 µg/mL (r2=0.9999). The specificity showed no interference of the excipients. The accuracy was 100.76%. The limits of detection and quantitation were 0.057 and 0.172 µg.mL-1, respectively. Moreover, method validation demonstrated satisfactory results for precision and robustness. The proposed method was applied for the analysis of the incorporation of FLU in ME and LC, contributing to improve the quality control and to assure the therapeutic efficacy.

scholarly journals Unconventional High-Performance Laser Protection System Based on Dichroic Dye-Doped Cholesteric Liquid Crystals

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Wanshu Zhang ◽  
Lanying Zhang ◽  
Xiao Liang ◽  
Le Zhou ◽  
Jiumei Xiao ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
High Performance ◽  
Protection System ◽  
Cholesteric Liquid Crystals ◽  
Dichroic Dye

Response Characteristics of High-Performance Photorefractive Liquid Crystals

1999 ◽  
Vol 38 (Part 1, No. 2A) ◽  
pp. 737-740 ◽  
Author(s):  
Hiroshi Ono ◽  
Nobuhiro Kawatsuki
Keyword(s):  
Liquid Crystals ◽  
High Performance ◽  
Response Characteristics

scholarly journals High Speed Laser Based Intersatellite Link Systems for Harsh Environment of Space

2019 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Fiber Optics ◽  
High Speed ◽  
High Performance ◽  
Low Earth Orbit ◽  
Critical Parameters ◽  
Great Promise ◽  
Harsh Environment ◽  
High Data ◽  
Aerospace Applications ◽  
Laser Communications

This paper will focus on the trends for the space-based lasers, optics and terminals used in the intersatellite networks. Reviewed and evaluate the recent development in the space-based laser technologies and the critical parameters that are employed for successful high-speed intersatellite communications systems. Fiber optics and photonics technology including lasers increasingly being used in aerospace applications and many challenges are involved, since designing for aerospace is very different than for the earth environment. Satellites are much more challenging and for their intersatellite solutions have to contemplate more specific requirements such as space radiation attacks, operation in harsh environment of space and achieving weight, power requirements and reliability for space are few to consider. Therefore it is important to design a system to defend against the radiation from ionizing, gamma, and other attacks. There are numerous methods to protect them from radiation, including shielding, error correction, and using radiation resistance shielding and radiation hardening. Building laser for high speed communications network for the harsh environment of space using optical links in space has proven to be complicated task and many such schemes were tried without success in the past. Space-based optical communications using satellites in low earth orbit (LEO) and Geo-synchronous orbits (GEO) hold great promise for the proposed Internet in the Sky network of the future. However in the last few years, there has been impressive progress made to bring the concept of laser-based intersatellite systems to fruition in civilian and government-non classified projects. Laser communications offer a viable alternative to established RF communications for inter-satellite links and other applications where high performance links are a necessity. High data rate, small antenna size, narrow beam divergence, and a narrow field of view are characteristics of laser-based systems and they are just few numbers of potential advantages for system design over radio frequency communication.

Theory and Simulation of Fiber Texture Formation and Rheology of Carbonaceous Mesophase Fibers

2001 ◽  
Vol 709 ◽  
Author(s):  
A. D. Rey
Keyword(s):  
Liquid Crystals ◽  
High Performance ◽  
Melt Spinning ◽  
Elongational Flow ◽  
Fiber Texture ◽  
Texture Formation ◽  
Cross Sectional ◽  
Wide Range ◽  
Spinning Process ◽  
Sectional Shape

ABSTRACTCarbonaceous mesophases are discotic nematic liquid crystals that are spun into high performance carbon fibers using the melt spinning process. The spinning process produces a wide range of different fiber textures and cross-sectional shapes. Circular planar polar (PP), circular planar radial (PR) textures, ribbon planar radial (RPR), and ribbon planar line (RPL) textures are ubiquitous ones. This paper presents, solves, and validates a model of mesophase fiber texture formation based on the classical Landau-de Gennes theory of liquid crystals, adapted here to carbonaceous mesophases. The effects of fiber cross-sectional shape and elongational flow on texture formation are characterized. Emphasis is on qualitative model validation using existing experimental data [1, 2]. The results provide additional knowledge on how to optimize and control mesophase fiber textures.

37.2: High Performance Blue Phase Liquid Crystals Stabilized by Linear Photopolymers

2015 ◽  
Vol 46 (1) ◽  
pp. 545-548 ◽  
Author(s):  
Daming Xu ◽  
Jiamin Yuan ◽  
Martin Schadt ◽  
Shin-Tson Wu
Keyword(s):  
Liquid Crystals ◽  
High Performance ◽  
Phase Liquid ◽  
Blue Phase
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