Structural Parameters, Electronic, Spectroscopic and Nonlinear Optical Theoretical Research of 1-(m-Chlorophenyl)piperazine (mCPP)  Molecule

Nonlinear optical dyes doped in optical polymer matrices are widely used for electro-optical devices. Linear optical properties change with dye concentration, which leads to a change in modal properties, especially in nano-structured integrated waveguides such as silicon slot-waveguides. Here, we investigate the influence of a nonlinear optical dye on the performance of a silicon-organic hybrid slot-waveguide. A simulation study of the modal and optical confinement properties is carried out and dependence of the structural parameters of the slot-waveguide and the organic cladding material is taken into account. As cladding material, a guest-host polymer system is employed comprising the nonlinear optical dye Disperse Red 1 (DR1) doped in a poly[methyl methacrylate] (PMMA) matrix. The refractive indices of doped and undoped PMMA were deduced from ellipsometric data. We present a guideline for an optimized slot-waveguide design for the fabrication in silicon-on-insulator technology giving rise to scalable, high-performance integrated electro-optical modulators.

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Design and test of vehicle suspension system with inerters

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406214521793 ◽

2014 ◽

Vol 228 (15) ◽

pp. 2684-2689 ◽

Cited By ~ 7

Author(s):

Ruochen Wang ◽

Xiangpeng Meng ◽

Dehua Shi ◽

Xiaoliang Zhang ◽

Yuexia Chen ◽

...

Keyword(s):

Structural Parameters ◽

Dynamic Performance ◽

Experimental Tests ◽

Test System ◽

Suspension System ◽

Theoretical Research ◽

Vehicle Suspension ◽

Bench Test ◽

Vehicle Suspension System ◽

Simulated Analysis

A vehicle suspension system with inerters is proposed and its dynamic model is established to analyse its dynamic performance. The structure of the suspension with inerters is also constructed and its form and structural parameters are optimized. Then the rack-and-pinion inerter and the bench test system of suspension are designed. Based on the simulation, bench test is conducted. It has shown that theoretical research is consistent with the test results. Moreover, the structure of the suspension with inerters is so simple, that it can be easily achieved. Consequently the passenger comfort is greatly enhanced and the comprehensive performance of the car has been coordinated. Therefore, simulated analysis and experimental tests in this paper can provide evidence for further research on suspension with inerters.

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Structural parameters versus third-order optical susceptibility of Zinc porphyrin molecules

Journal of Materials Chemistry C ◽

10.1039/d1tc04777a ◽

2021 ◽

Author(s):

Amina Yasin ◽

Vijayakumar S. Nair ◽

Mohd Hasbi Ab Rahim ◽

Yoshihisa Yamaoka ◽

Chandra S Yelleswarapu ◽

...

Keyword(s):

Excited State ◽

Nonlinear Optical ◽

Structural Parameters ◽

Excited State Absorption ◽

Structure Property ◽

Third Order ◽

Promising Candidate ◽

Zinc Porphyrin ◽

Optical Susceptibility ◽

Structure Property Relationship

To deepen the structure-property relationship, and thereby developing improved third-order nonlinear optical (NLO) molecular materials, porphyrin is a promising candidate because of its strong excited state absorption, high triplet yields,...

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Structural, Optical, and Optoelectrical Studies of Spray Pyrolyzed CuGaSnS4 Thin Films

ECS Journal of Solid State Science and Technology ◽

10.1149/2162-8777/ac4219 ◽

2021 ◽

Author(s):

Islam M El radaf ◽

Hnan Y Alzahrani

Keyword(s):

Thin Films ◽

Film Thickness ◽

Nonlinear Optical ◽

Energy Gap ◽

Structural Parameters ◽

Stoichiometric Composition ◽

Optical Energy Gap ◽

Linear Absorption ◽

Glass Substrates ◽

D Values

Abstract We deposited CuGaSnS4 thin films on soda-lima glass substrates via a spray pyrolysis process. The X-ray diffraction of CuGaSnS4 films established the formation of an orthorhombic single phase. In addition, the structural parameters of the CuGaSnS4 films were estimated by Debye-Scherer’s formulas, which showed that an enhancement in crystallite size (D) values occurred by increasing the thickness of the investigated films. The EDAX pattern of CuGaSnS4 films confirms a stoichiometric composition. The optical results revealed that the CuGaSnS4 films possessed a direct optical energy gap (Eg). The Eg values were reduced from 1.50 to 1.38 eV with the increase in thickness. Also, there was an observed increase in the linear refractive index and the linear absorption coefficient values occurred due to the increased thickness. Finally, the optoelectrical constants of the sprayed CuGaSnS4 films such as the optical conductivity (σopt) and the optical free carrier concentration to effective mass (N_opt/m^* ) were enlarged with increasing film thickness. The nonlinear optical study showed that the increase in film thickness enhanced the nonlinear optical constants of CuGaSnS4 films. The hot-probe procedure shows that the sprayed CuGaSnS4 films expose p-type conductivity.

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Yhe Compression Meso-Mechanics Theoretical Model and Experimental Verification of Polyurethane-Based Warp-Knit Spacer Fabric Composites

AATCC Journal of Research ◽

10.14504/ajr.8.5.4 ◽

2021 ◽

Vol 8 (5) ◽

pp. 30-38

Author(s):

Si Chen

Keyword(s):

Theoretical Model ◽

Structural Parameters ◽

Three Dimensional ◽

Beam Theory ◽

Theoretical Research ◽

Dimensional Structure ◽

Static Compression ◽

Theoretical Simulation ◽

Winkler Elastic Foundation ◽

Spacer Fabric

In this research, a new type of binary material, a polyurethane-based warp-knitted spacer fabric composite (PWSF), having a unique three-dimensional structure, high strength, and a variety of surface structures was prepared. The compression meso-mechanics theoretical model based on the Winkler elastic foundation beam theory and structural parameters of PWSF were used to predict the compression performance of PWSF. To verify the validity of compression model, the compression stress-strain curves of theoretical simulation were compared with the quasi-static compression test results. The deviation between these two compression moduli was less than 7%. The compression meso-mechanics model established in this study can effectively simulate the actual compression behaviors for different PWSF specimens. A regular pattern of compression properties of this novel composite from the theoretical research on meso-mechanics perspectives can be proposed.

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RESEARCH ON FLEXIBLE DRILL STRING VIBRATION INDUCED BY SONIC HARMONIC EXCITATION

Transactions of the Canadian Society for Mechanical Engineering ◽

10.1139/tcsme-2015-0020 ◽

2015 ◽

Vol 39 (2) ◽

pp. 281-291 ◽

Cited By ~ 2

Author(s):

Changgen Bu ◽

Long Sun ◽

Yuanbiao Hu ◽

Bairu Xia

Keyword(s):

Large Scale ◽

Structural Parameters ◽

Excitation Frequency ◽

Harmonic Excitation ◽

Drill String ◽

Vibration Response ◽

Theoretical Research ◽

String Vibration ◽

Drilling Technology ◽

Overburden Soil

The undisturbed sampling of the overburden soil is attracting increased attention due to the rapid increases in the construction of large-scale domestic foundations and environmental protection engineering. To date, systematic theoretical research on sonic drilling technology has rarely been published. In the present paper, the vibration response induced by sonic harmonic excitation is studied by modeling the flexible drill string of a sonic drill; its dynamic theory and design methodology have been developed, which reveal effects of the excitation frequency, the structural parameters on vibration response of the drill string. The study of sonic drill string vibration is beneficial for improving the drilling efficiency and reducing the damage.

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Tuning optical properties of cadmium thiourea acetate nonlinear optical crystal exploiting organic ligand of L-proline

Modern Physics Letters B ◽

10.1142/s0217984918504249 ◽

2019 ◽

Vol 33 (01) ◽

pp. 1850424 ◽

Cited By ~ 1

Author(s):

R. B. Kulkarni ◽

M. Anis ◽

S. S. Hussaini ◽

M. D. Shirsat

Keyword(s):

Optical Properties ◽

Nonlinear Optical ◽

Fourier Transforms ◽

Second Harmonic ◽

Structural Parameters ◽

Nonlinear Refraction ◽

Organic Ligand ◽

Infrared Analysis ◽

Uv Visible ◽

Shg Efficiency

Modifying optical properties of crystal is very fundamental need for designing various photonic devices, hence in the current investigation, the L-proline (LP) has been firstly doped in cadmium thiourea acetate (CTA) crystal with the aim to optimize the UV–Visible, second harmonic generation (SHG) efficiency, luminescence and third-order nonlinear optical (TONLO) properties of CTA crystal. The pure and doped CTA crystals have been grown by slow solvent evaporation technique at [Formula: see text]C. The structural parameters of grown crystals have been determined using the single crystal X-ray diffraction technique. The incorporation of LP in CTA crystal matrix has been confirmed by Fourier transforms infrared analysis. The UV–Visible studies have been employed within the wavelength range of 200–900 nm to explore the enhancing impact of LP on CTA crystal. The LP doped CTA crystals were subjected to Kurtz–Perry test and Z-scan analysis to identify the nonlinear nature of studied crystals. The SHG efficiency of LP-CTA crystal shows significant increase owing to enhanced charge transfer over the organic ligand of LP. The laser-induced TONLO properties of LP-doped CTA crystal have been determined at 632.8 nm. The nature of nonlinear refraction and absorption has been explored by close and open aperture Z-scan configuration. The magnitude of nonlinear refraction [Formula: see text], absorption coefficient [Formula: see text], cubic susceptibility [Formula: see text] and figure of merit has been determined using the transmittance data. The color-centered luminescence studies have been carried out which established the prominent redshift in peak maxima of emission wavelength of CTA crystal due to doping of LP. Comparative analysis of pure and doped crystal confirmed the dominance of LP doping.

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Leakage Calculation Method of Carbon Fiber Brush Seal Based on Porous Medium

10.21203/rs.3.rs-102580/v1 ◽

2020 ◽

Author(s):

Yan-Chao Zhang ◽

Chun-hua Du ◽

Rui Zhao ◽

Ya-Hui Cui

Keyword(s):

Porous Medium ◽

Carbon Fiber ◽

Gas Turbines ◽

High Speed ◽

Structural Parameters ◽

Calculation Model ◽

Theoretical Research ◽

Equivalent Diameter ◽

Brush Seal ◽

Back Plate

Abstract As a kind of flexible high-speed dynamic sealing device, brush seal has a good application prospect in high-speed dynamic sealing parts of major equipment, such as gas path of aircraft engines, rocket motors and gas turbines. However, the theoretical research and practical engineering application of brush seal are limited because there are some problems in the practical application. For example, the tip of bristle burned by friction heat under high speed, increased wear and the difficult calculation of leakage. To this end, the structure of the brush seal use the carbon fiber instead of the high-temperature alloy metal bristle. Then the carbon fiber brush volume equivalent diameter is used to establish the carbon fiber brush resistance calculation model based on the porous medium method, which construct the leakage calculation model of the carbon fiber brush seal. Finally, they are obtained by solution of the model in Fluent software that the leakage flow characteristics of the carbon fiber brush seal at work and the influence of different working conditions and structural parameters on the leakage performance. The results show that the carbon fiber calculation model has better adaptability, and the calculation results also show that the carbon fiber brush seal has a lower leakage than the metal bristle under the same working condition. Moreover, the linear factors affecting the leakage of the carbon fiber brush seal are the height of the back plate and the diameter of the bristle, and the height of the front baffles has little effect, while the nonlinear factors are the thickness of brush and the angle of the bristle arrangement. The study provide an significant reference for high performance design of brush seal and its engineering applications.

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Optimizing on hydrostatic structural parameters for regulatable dry gas seal based on central composite design test

Industrial Lubrication and Tribology ◽

10.1108/ilt-03-2015-0027 ◽

2016 ◽

Vol 68 (1) ◽

pp. 99-105 ◽

Cited By ~ 1

Author(s):

Zhaoxu Jin ◽

Shuangxi Li ◽

Jining Cai ◽

qiuxiang zhang

Keyword(s):

Film Thickness ◽

Central Composite Design ◽

Structural Parameters ◽

Force Balance ◽

Theoretical Research ◽

Analysis Method ◽

Content Type ◽

Dry Gas Seal ◽

Actual Working ◽

Central Composite

Purpose – This paper aims to introduce a new type of analysis method to seek the actual working performance of the regulatable dry gas seal, including equilibrium film thickness, stiffness-leakage ratio and so on. Additionally, a parametric optimization of the hydrostatic structure is completed for this kind of seal. Design/methodology/approach – From the point of axial force balance based on gas lubrication theory, a new analysis method, the Gas Film Divided Method, has been introduced. A four-factor and three-level hydrostatic structural parameters test scheme is designed by means of Central Composite Design test and then the hydrostatic structural parameters of regulatable dry gas seal were optimized. Three types of regulatable dry gas seal have been designed and manufactured to verify the theoretical analysis by measuring the equilibrium film thickness and inward leakage. Findings – The results indicate that the numerical values of the Gas Film Divided (GFD) method agree well with the experimental ones. Test proves that the Central Composite Design test could achieve optimized hydrostatic structural parameters of regulatable dry gas seal effectively. Research limitations/implications – For validating the correctness of the GFD method, an experiment study of the regulatable dry gas seal is being carried out where atmosphere is selected as the lubricant for the sake of safety. Soon after, the author will discuss the application in the new paper. Originality/value – The introduction of the GFD method proffers important insights to seek the performances of regulatable dry gas seal under the actual working conditions. The detailed optimal values of the hydrostatic structural parameters were given by the theoretical research which may be helpful for the design of regulatable dry gas seal.

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