The use of microelectronics radiation behavior asphysical uncloned function to find counterfeit

A comparison of sound radiation behavior of plate in air medium with attached discrete patches/point masses having different thickness variations with different taper ratio of 0.3, 0.6, and 0.9 is analysed. Finite element method is used to find the vibration characteristics while Rayleigh integral is used to predict the sound radiation characteristics. Minimum peak sound power level obtained is at a taper ratio of 0.6 with parabolic increasing-decreasing thickness variation for plate with four discrete patches. At higher taper ratio, linearly increasing-decreasing thickness variation is another alternative for minimum peak sound power level suppression with discrete patches. It is found that, in low frequency range, average radiation efficiency remains almost the same, but near first peak, four patches or four point masses cause increase in average radiation efficiency; that is, redistribution of point masses/patches does have effect on average radiation efficiency at a given taper ratio.

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Three-dimensional tomographic imaging for dynamic radiation behavior study using infrared imaging video bolometers in large helical device plasma

Review of Scientific Instruments ◽

10.1063/1.4948392 ◽

2016 ◽

Vol 87 (5) ◽

pp. 053502 ◽

Cited By ~ 6

Author(s):

Ryuichi Sano ◽

Byron J. Peterson ◽

Masaru Teranishi ◽

Naofumi Iwama ◽

Masahiro Kobayashi ◽

...

Keyword(s):

Infrared Imaging ◽

Three Dimensional ◽

Tomographic Imaging ◽

Behavior Study ◽

Radiation Behavior

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A Two-Stage Model for Energy Transmission and Radiation Analysis of Laminated Composite Double-Leaf Structures

Journal of Vibration and Acoustics ◽

10.1115/1.4036390 ◽

2017 ◽

Vol 139 (4) ◽

Author(s):

Atanu Sahu ◽

Arup Guha Niyogi ◽

Michael Rose ◽

Partha Bhattacharya

Keyword(s):

Boundary Element ◽

Laminated Composite ◽

Air Gap ◽

Transmission Characteristics ◽

Energy Transmission ◽

Two Stage ◽

Second Stage ◽

Complex Boundary ◽

Radiation Behavior ◽

Element Boundary

A two-stage numerical model is developed to understand the energy transmission characteristics through a finite double-leaf structure placed in an infinite baffle subjected to an external excitation and subsequently the sound radiation behavior of the same into the semi-infinite receiving side. In the first stage, a mobility-based coupled finite element–boundary element (FE–BE) technique is implemented to model the energy transmission from the primary panel to the secondary panel through an air gap. In the second stage, a separate boundary element (BE)-based model is developed to estimate the sound power radiated by the radiating (secondary) panel into the receiving side which is assumed to be semi-infinite. The advantage of the proposed approach is that it is sufficient to mesh the structural panels alone, thereby reducing the problem dimensions and the difficulty in modeling. Moreover, the developed model can be easily implemented for structures made up of various constituent materials (isotropic or laminated composites) with complex boundary conditions and varying panel geometries. Numerical experiments are carried out for different material models by varying air-gap thicknesses and also by introducing alternate energy transmission path in terms of mechanical links and the obtained results are discussed.

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A Novel Compact Microstrip UWB Rectangular Stair Slot Antenna for the Analysis of Return Losses

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.j1084.0881019 ◽

2019 ◽

Vol 8 (10) ◽

pp. 4597-4603 ◽

Cited By ~ 1

Keyword(s):

Return Loss ◽

Wide Band ◽

Directional Pattern ◽

Slot Antenna ◽

Ultra Wide Band ◽

Radiation Patterns ◽

Uwb Antenna ◽

Antenna Performance ◽

Ansoft Hfss ◽

Radiation Behavior

This article deals with the various designs of a novel compact microstrip fed UWB antenna to investigate the corresponding return losses of different structures. The dimension of the designed antenna is 33 x 19 x 1.9 mm3 with FR4 substrate and it can be operated from 2.846 - 11.7458 GHz. The effects of varying the structure of antenna are to exhibit the investigation of corresponding return losses. Different structures of antenna are simulated in Ansoft HFSS simulator. The results of return losses and radiation patterns are explored with the ultra wide band (UWB) rectangular Stair slot antenna. The modified structure of antenna shows the minimized return loss with an enhanced bandwidth that satisfies good UWB characteristics. Antenna performance can also be explored from the radiation behavior of the antenna which is relatively omni-directional pattern for rectangular Stair slot antenna

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Matrix graphites for HTGR fuel elements. variants in production. properties. radiation behavior

Atomic Energy ◽

10.1007/bf00760879 ◽

1992 ◽

Vol 72 (4) ◽

pp. 324-330

Author(s):

A. S. Chernikov ◽

L. I. Mikhailichenko ◽

V. A. Reshetnikov ◽

A. S. Cherkasov ◽

D. P. Mamii ◽

...

Keyword(s):

Radiation Behavior ◽

Fuel Elements ◽

Htgr Fuel

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Structure-Integrated Loudspeaker Using Fiber-Reinforced Plastics and Piezoelectric Transducers—Design, Manufacturing and Validation

Applied Sciences ◽

10.3390/app10103438 ◽

2020 ◽

Vol 10 (10) ◽

pp. 3438

Author(s):

Benjamin Zenker ◽

Martin Dannemann ◽

Sirko Geller ◽

Klaudiusz Holeczek ◽

Oliver Weißenborn ◽

...

Keyword(s):

Laser Scanning ◽

Sound Radiation ◽

Fiber Reinforced ◽

Side Panel ◽

Lightweight Structures ◽

Reinforced Plastics ◽

Design Variables ◽

Element Simulation ◽

Radiation Behavior ◽

The Given

In the present study, it could be shown that by integration of a piezoceramic transducer in a fiber-reinforced door side panel, a flat loudspeaker can be realized. Taking into account the given restrictions, the integration position has been identified, where the geometry decouples the vibrating membrane from the supporting surface. With the help of an acoustic finite-element simulation, the main design variables of the integration position were found and the relevant effects for sound radiation were made visible. The manufacturing of the test specimen with piezoceramic transducers was performed using vacuum-assisted resin infusion and the long fiber injection procedure. The effect on the real sound radiation behavior of the door side panel with a material-immanent loudspeaker was experimentally determined using laser scanning vibrometry and sound pressure measurements. The presented work shows, for the first time, the high potential of acoustic functionalization of lightweight structures during the manufacturing process for the realization of lightweight and space-saving loudspeakers in a production-ready process.

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Estimation and Use of the Radiation Distribution Factor Median for Predicting Uncertainty in the Monte Carlo Ray-Trace Method

Journal of Heat Transfer ◽

10.1115/1.4043306 ◽

2019 ◽

Vol 141 (6) ◽

Cited By ~ 4

Author(s):

Mehran Yarahmadi ◽

J. Robert Mahan ◽

Kory J. Priestley

Keyword(s):

Heat Transfer ◽

Monte Carlo ◽

A Priori ◽

Heat Transfer Analysis ◽

Distribution Factor ◽

Recent Contribution ◽

Radiation Distribution ◽

Radiation Behavior ◽

Ray Trace ◽

Probability Density Function Pdf

In a recent contribution, the authors show that the uncertainty in heat transfer results obtained using the Monte Carlo ray-trace (MCRT) method is related to the median of the radiation distribution factor probability density function (PDF). The value of this discovery would be significantly enhanced if the median could be known a priori without first computing the distribution factors. This would allow the user to determine the number of rays required to achieve the desired accuracy of a subsequent heat transfer analysis. The current contribution presents a correlation for the median of the distribution factor PDF as a function of emissivity and the number of surface elements defining an enclosure. The correlation involves a single parameter whose value is unique for a given enclosure geometry. We find that the radiation behavior of a given enclosure can be classified on a scale ranging from reflection-dominated to geometry-dominated. The correlation is shown to work well for reflection-dominated enclosures but less well for geometry-dominated enclosures.

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