ESTIMATION OF ABSORPTION COEFFICIENT DISTRIBUTION IN TWO-DIMENSIONAL GAS VOLUME BY SOLVING INVERSE RADIATIVE PROPERTY VALUE PROBLEM

1997 ◽  
Author(s):  
Eiji Ozaki ◽  
Kazuhiko Kudo ◽  
Akiyoshi Kuroda ◽  
Masahito Oguma
Keyword(s):  
Absorption Coefficient ◽  
Radiative Property ◽  
Two Dimensional ◽  
Property Value ◽  
Coefficient Distribution ◽  
Gas Volume

THEORETICAL MODEL FOR THE CALCULATION OF OPTICAL PROPERTIES OF GOLD NANOPARTICLES

2010 ◽  
Vol 19 (03) ◽  
pp. 427-436
Author(s):  
A. MENDOZA-GARCÍA ◽  
A. ROMERO-DEPABLOS ◽  
M. A. ORTEGA ◽  
J. L. PAZ ◽  
L. ECHEVARRÍA
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Optical Properties ◽  
Theoretical Model ◽  
Absorption Coefficient ◽  
Molecular System ◽  
Two Dimensional ◽  
Box Models ◽  
Solvent Environment ◽  
Absorption And Dispersion

We have developed an analytical method to describe the optical properties of nanoparticles, whose results are in agreement with the observed experimental behavior according to the size of the nanoparticle under analysis. Our considerations to describe plasmonic absorption and dispersion are based on the combination of the two-level molecular system and the two-dimensional quantum box models. Employing the optical stochastic Bloch equations, we have determined the system's coherence, from which we have calculated expressions for the absorption coefficient and refractive index. The innovation of this methodology is that it allows us to take into account the solvent environment, which induce quantum effects not considered by classical treatments.

Microwave Induced Thermoacoustic Imaging of Osteoarthritis: A Feasibility Study

2014 ◽  
Vol 905 ◽  
pp. 498-501
Author(s):  
Bo Li Su ◽  
Wei Zhi Qi ◽  
Xue Liang Xu ◽  
L. Huang ◽  
X.C. Zhong ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Pilot Study ◽  
Absorption Coefficient ◽  
Feasibility Study ◽  
Two Dimensional ◽  
Finger Joints ◽  
Thermoacoustic Imaging ◽  
The Difference ◽  
First Time

We present a pilot study for the first time that microwave-induced thermoacoustic tomography (TAT) has the potential to detect osteoarthritis (OA) in the finger jointsin vitro. In this study, we use rabbit hind feet to imitate humans finger joints, one rabbits hind feet was examined carefully by a TAT scanner, and the two-dimensional (2D) thermoacoustic images were reconstructed by the delay-and-sum algorithm. The difference of absorption coefficient of bone and articular cartilage has been displayed clearly in the reconstruction images.

Inverse BEM Method to Identify Surface Temperatures and Heat Transfer Coefficient Distributions at Inaccessible Surfaces

2005 ◽  
Author(s):  
Alain J. Kassab ◽  
Eduardo A. Divo ◽  
Minking K. Chyu ◽  
Frank J. Cunha
Keyword(s):  
Heat Transfer ◽  
Inverse Problem ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Field Variable ◽  
Quadratic Functional ◽  
Two Dimensional ◽  
Additional Information ◽  
Coefficient Distribution ◽  
The Heat Transfer Coefficient

The purpose of the inverse problem considered in this study is to resolve heat transfer coefficient distributions by solving a steady-state inverse problem. Temperature measurements at interior locations supply the additional information that renders the inverse problem solvable. A regularized quadratic functional is defined to measure the deviation of computed temperatures from the values under current estimates of the heat transfer coefficient distribution at the surface exposed to convective heat transfer. The inverse problem is solved by minimizing this functional using a parallelized genetic algorithm (PGA) as the minimization algorithm and a two-dimensional multi-region boundary element method (BEM) heat conduction code as the field variable solver. Results are presented for a regular rectangular geometry and an irregular geometry representative of a blade trailing edge and demonstrate the success of the approach in retrieving accurate heat transfer coefficient distributions.

scholarly journals Manipulable Electronic and Optical Properties of Two-Dimensional MoSTe/MoGe2N4 van der Waals Heterostructures

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3338
Author(s):  
Jiali Wang ◽  
Xiuwen Zhao ◽  
Guichao Hu ◽  
Junfeng Ren ◽  
Xiaobo Yuan
Keyword(s):  
Optical Properties ◽  
Absorption Coefficient ◽  
High Performance ◽  
Density Functional ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Electronic And Optical Properties ◽  
Wide Range ◽  
Direct Band

van der Waals heterostructures (vdWHs) can exhibit novel physical properties and a wide range of applications compared with monolayer two-dimensional (2D) materials. In this work, we investigate the electronic and optical properties of MoSTe/MoGe2N4 vdWH under two different configurations using the VASP software package based on density functional theory. The results show that Te4-MoSTe/MoGe2N4 vdWH is a semimetal, while S4-MoSTe/MoGe2N4 vdWH is a direct band gap semiconductor. Compared with the two monolayers, the absorption coefficient of MoSTe/MoGe2N4 vdWH increases significantly. In addition, the electronic structure and the absorption coefficient can be manipulated by applying biaxial strains and changing interlayer distances. These studies show that MoSTe/MoGe2N4 vdWH is an excellent candidate for high-performance optoelectronic devices.

Monolayer SnP3: an excellent p-type thermoelectric material

Nanoscale ◽  
2019 ◽  
Vol 11 (42) ◽  
pp. 19923-19932 ◽  
Author(s):  
Xue-Liang Zhu ◽  
Peng-Fei Liu ◽  
Junrong Zhang ◽  
Ping Zhang ◽  
Wu-Xing Zhou ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Thermoelectric Material ◽  
Carrier Mobility ◽  
Optical Absorption Coefficient ◽  
Two Dimensional ◽  
Potential Applications ◽  
High Carrier Mobility ◽  
High Carrier ◽  
P Type

Monolayer SnP3 is a novel two-dimensional (2D) semiconductor material with high carrier mobility and large optical absorption coefficient, implying its potential applications in the photovoltaic and thermoelectric (TE) fields.

An experimental study on acoustical performance of cross rib diffuser

2021 ◽  
Vol 263 (2) ◽  
pp. 4538-4545
Author(s):  
Takumi Yoshida ◽  
Yasutaka Ueda ◽  
Norimasa Mori ◽  
Yumi Matano
Keyword(s):  
Experimental Study ◽  
Absorption Coefficient ◽  
Speech Intelligibility ◽  
Scattering Coefficient ◽  
Two Dimensional ◽  
Reverberation Time ◽  
One Dimensional ◽  
Meeting Room ◽  
Small Absorption ◽  
Structural Configurations

The preset paper proposes a novel acoustic diffuser which we call cross rib diffuser (CRD) and investigates its acoustical performance in rooms experimentally. CRD consists of overlapping two one-dimensional periodic rib diffuser (OPRD) with different structural configurations. CRD can achieve high scattering coefficient with wider frequency band than OPRD. Moreover, unlike other diffusers with high scattering property such as metadiffuser and two-dimensional quadratic diffuser, CRD keeps simple and familiar design of OPRD suitable for use in various architectural spaces. In the paper, we firstly evaluated random-incidence scattering coefficient of CRD using 1/5 scaled reverberation room. Then, random-incidence absorption coefficient was measured in 1/1 reverberation room. Finally, an implementation experiment was conducted to examine applicability of CRD in improving acoustics in small meeting room with small absorption treatments. The results indicated that CRD reduced EDT and reverberation time, and increased D50 more than JND values. Additionally, CRD improved reverberation and speech intelligibility more significantly than OPRD with same installation area.

scholarly journals Two-Dimensional Correlation Analysis in Application to a Kinetic Model of Parallel Reactions

2003 ◽  
Vol 57 (2) ◽  
pp. 168-175 ◽  
Author(s):  
Thou-Long Chin ◽  
King-Chuen Lin
Keyword(s):  
Kinetic Model ◽  
Correlation Analysis ◽  
Absorption Coefficient ◽  
Rate Constant ◽  
Reference Spectrum ◽  
Two Dimensional ◽  
Constant Intensity ◽  
Increase With Increase ◽  
Parallel Reactions ◽  
Coherence Spectrum

By applying generalized two-dimensional (2D) correlation analysis as reported by Noda, we have systematically studied a kinetic model of parallel reactions. Given the related rate constants and absorption coefficients, the correlation between reactant and products are analyzed. The reactant–reactant, reactant–product, and product–product pairs are found to be synchronously correlated, and their intensities increase with increase of the rate constant and the absorption coefficient. On the other hand, only the reactant–product pairs show in the asynchronous spectra. Their intensities also depend proportionally on the rate constant and the absorption coefficient. The influence of signal-to-noise ratio (S/N) and overlapped spectra are further discussed. The resulting synchronous and asynchronous correlation spectra for the kinetic model appear to be weakly influenced by poor quality of the signal when the reference spectrum is set at zero. The ratio of asynchronous to synchronous correlation intensity yields a coherence spectrum. This spectrum remains a constant intensity for all the correlated peaks, being free from the influence of rate constant and absorption coefficient as well as being weakly disturbed by a small S/N ratio. It also provides a way to evaluate the extent of spectral overlap between two peaks. The coherence spectrum is useful to characterize the type of parallel reactions.

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