Material platform for realization of a “fiber-like” lossy mode resonance response in a simple Kretschmann–Raether geometry: publisher’s note

2021 ◽  
Author(s):  
Daniel Franzen ◽  
Chris Videll
Keyword(s):  
Resonance Response

scholarly journals Thermoelectric Sensor Coupled Yagi–Uda Nanoantenna for Infrared Detection

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 527
Author(s):  
Waleed Tariq Sethi ◽  
Olivier De Sagazan ◽  
Mohamed Himdi ◽  
Hamsakutty Vettikalladi ◽  
Saleh A. Alshebeili
Keyword(s):  
State Of The Art ◽  
Infrared Detection ◽  
Single Element ◽  
Center Wavelength ◽  
Resonance Response ◽  
Thermal Measurements ◽  
Radiation Induced ◽  
Thermoelectric Sensor ◽  
Junction Array ◽  
First Time

We present an experimental demonstration of a thermoelectric sensor coupled with a nanoantenna as an alternative option for detecting infrared energy. Two nanoantenna design (single element and an array) variations based on Yagi-Uda technology and one separate nano-thermoelectric junction array were fabricated and tested. The nanoantennas were tuned to operate and respond at a center wavelength of 1550 nm (193.5 THz) optical C-band window, but they also exhibited a resonance response when excited by lasers of various wavelengths (650 nm and 940 nm). The radiation-induced electric currents in the nanoantennas, coupled with a nano-thermoelectric sensor, produced a potential difference as per the Seebeck effect. With respect to the uniform thermal measurements of the reference nanoantenna, the experiments confirmed the detection properties of the proposed nanoantennas; the single element detected a peak percentage voltage hike of 28%, whereas the array detected a peak percentage voltage hike of 80% at the center wavelength. Compared to state-of-the-art thermoelectric designs, this was the first time that such peak percentage voltages were experimentally reported following a planar design based on the Seebeck principle.

Vibration behavior of an overhead conductor under updraft winds

2021 ◽  
pp. 107754632110058
Author(s):  
Qi Zhou ◽  
Liangtao Zhao ◽  
Chong Zheng ◽  
Feng Tu
Keyword(s):  
Induced Response ◽  
Response Analysis ◽  
Response Factor ◽  
Structural Dynamic ◽  
Resonance Response ◽  
Structural Dynamic Characteristics ◽  
Strong Winds ◽  
American Society ◽  
Gust Response Factor ◽  
Gust Response

At present, the wind-induced response analysis of an overhead conductor is mainly based on the action of horizontal normal wind. However, for crossing hillsides or extremely strong winds, such a conductor will bear the action of updraft wind, which will change the geometry of the conductor and make its structural dynamic characteristics nonlinear to some extent. In this work, the in-plane and out-of-plane two-dimensional nonlinear equations were established under the action of self-weight and updraft wind. Furthermore, the improved equations of conductor tension and sag were obtained, and the wind-induced vibration response was further investigated. The results showed that the updraft wind caused the nonlinearity of the tension and sag of the overhead conductor, and the nonlinear geometric change significantly affected its resonance response, which exceeded 25% if the wind speed was 50 m/s. In addition, because the proportion of the resonance response in the total wind-induced response was different, the influence of the wind attack angle calculated using the gust response factor method on the gust response factor was slightly larger than that calculated using the the American society of civil engineers method.

Effect of Damping Constants and Stress Distribution on the Resonance Response of Members

1953 ◽  
Vol 20 (2) ◽  
pp. 201-209
Author(s):  
B. J. Lazan
Keyword(s):  
Stress Distribution ◽  
Amplification Factor ◽  
Engineering Practice ◽  
Distribution Factor ◽  
Mathematical Relationship ◽  
Cross Sectional ◽  
Resonance Response ◽  
Properties Of Materials ◽  
Material Factor ◽  
Sectional Shape

Abstract The amplitude of vibration of a member at resonance, as defined by its resonance amplification factor, is analyzed in relationship to the damping properties of materials. Data are presented on damping energy to indicate the effect of stress magnitude, stress history, and temperature. Based on the mathematical relationship found to exist between damping and stress magnitude the resonance amplification factors are determined for a variety of direct stress members and beams. It is shown that the amplification in vibration caused by resonance may be considered to be the product of three basic factors, i.e., (a) the material factor, (b) the cross-sectional shape factor, and (c) the longitudinal stress-distribution factor. The first of these factors may be calculated from the damping and dynamic modulus properties of the material and the last two from the shape and loading characteristics of the member. Diagrams are presented to show these basic factors as functions of the damping exponent and other variables for members commonly encountered in engineering practice. Experimental data are presented to confirm the equations derived for resonance amplification factor of members having various shapes and stress distribution.

scholarly journals Friction Damper Optimisation: Simulation of Rainbow Tests

1999 ◽  
Author(s):  
Kenan Y. Sanliturk ◽  
David J. Ewins ◽  
Robert Elliott ◽  
Jeff S. Green
Keyword(s):  
Harmonic Balance Method ◽  
Lumped Parameter Model ◽  
Friction Damper ◽  
Blade Vibration ◽  
Friction Dampers ◽  
Lumped Parameter ◽  
Engine Order ◽  
Resonance Response ◽  
Theoretical Predictions ◽  
Different Characteristics

Friction dampers have been used to reduce turbine blade vibration levels for a considerable period of time. However, optimal design of these dampers has been quite difficult due both to a lack of adequate theoretical predictions and to difficulties in conducting reliable experiments. One of the difficulties of damper weight optimisation via the experimental route has been the inevitable effects of mistuning. Also, conducting separate experiments for different damper weights involves excessive cost. Therefore, current practice in the turbomachinery industry has been to conduct so-called ‘rainbow tests’ where friction dampers with different weights are placed between blades with a predefined configuration. However, it has been observed that some rainbow test results have been difficult to interpret and have been inconclusive for determining the optimum damper weight for a given bladed-disc assembly. A new method of analysis — a combination of Harmonic Balance Method and structural modification approaches — is presented in this paper for the analysis of structures with friction interfaces and the method is applied to search for qualitative answers about the so-called ‘rainbow tests’ in turbomachinery applications. A simple lumped-parameter model of a bladed-disc model was used and different damper weights were modelled using friction elements with different characteristics. Resonance response levels were obtained for bladed discs with various numbers of blades under various engine-order excitations. It was found that rainbow tests, where friction dampers with different weights are used on the same bladed-disc assembly, can be used to find the optimum damper weight if the mode of vibration concerned has weak blade-to-blade coupling (the case where the disc is almost rigid and blades vibrate almost independently from each other). Otherwise, it is very difficult to draw any reliable conclusion from such expensive experiments.

scholarly journals Estimation of resonance characteristics of single-layer surface-plasmon sensors in liquid solutions using Fano’s approximation in the visible and infrared regions

2019 ◽  
Vol 43 (4) ◽  
pp. 596-604 ◽  
Author(s):  
D.V. Nesterenko ◽  
R.A. Pavelkin ◽  
S. Hayashi
Keyword(s):  
Surface Plasmon ◽  
Single Layer ◽  
Field Enhancement ◽  
Coupled Mode Theory ◽  
Mid Infrared ◽  
Coupled Mode ◽  
Sensing Applications ◽  
Resonance Response ◽  
Liquid Solutions ◽  
Support Excitation

In this work, we consider the use of planar sensing structures, which support excitation of surface plasmon polarition (SPP) modes, for detecting changes in solvents, i.e. water, ethanol, isopropanol. In the structures under study, SPP modes propagate along the interfaces between metals and general solvents. The analysis of characteristics of the resonance response is based on Fano’s approximation within the coupled-mode theory in the visible and infrared regions. The maximum sensitivity and field enhancement are revealed in the near- and mid-infrared regions in the case of ethanol and isopropanol, which enables sensing applications beyond the regions of water absorption.

scholarly journals Smile (but only deliberately) though your heart is aching: Loneliness is associated with impaired spontaneous smile mimicry

2019 ◽  
Author(s):  
Andy Arnold
Keyword(s):  
Emotional Stimuli ◽  
Resonance Mechanism ◽  
Facial Electromyography ◽  
Social And Emotional ◽  
Video Clips ◽  
Behavioral Mechanism ◽  
Corrugator Supercilii ◽  
Physiological Dysregulation ◽  
Resonance Response ◽  
Perceived Social Isolation

As social beings, humans harbor an evolved capacity for loneliness—perceived social isolation. Feelings of loneliness are associated with aberrant affective and social processing, as well as deleterious physiological dysregulation. We investigated how loneliness affects spontaneous facial mimicry (SFM), an interpersonal resonance mechanism involved in social connection and emotional contagion. We used facial electromyography (fEMG) to measure activity of the zygomaticus major (“smiling muscle”) and corrugator supercilii (“frowning muscle”) while participants viewed emotional stimuli, such as video clips of actors expressing anger, fear, sadness, or joy, and emotional IAPS images. We also measured self-reported loneliness, depression, and extraversion levels. Evidence for SFM was found in greater fEMG activity of the zygomaticus and corrugator to positive and negative emotions, respectively. However, individuals reporting higher levels of loneliness lacked SFM for expressions of joy. Loneliness did not affect deliberate mimicry activity to the same expressions, or spontaneous reactions to positive, negative, or neutral IAPS images. Depression and extraversion did not predict any differences in fEMG responses. We argue that impaired automaticity of “smiling back” at another—a faulty interpersonal resonance response—represents a pervasive behavioral mechanism that likely contributes to negative social and emotional consequences of loneliness and may facilitate loneliness contagion.

Principal resonance response of a stochastic elastic impact oscillator under nonlinear delayed state feedback

2015 ◽  
Vol 24 (4) ◽  
pp. 040502 ◽  
Author(s):  
Dong-Mei Huang ◽  
Wei Xu ◽  
Wen-Xian Xie ◽  
Qun Han
Keyword(s):  
State Feedback ◽  
Principal Resonance ◽  
Impact Oscillator ◽  
Elastic Impact ◽  
Resonance Response ◽  
Delayed State Feedback

Analytical solutions for the resonance response of Goupillaud-type elastic media using z-transform methods

Wave Motion ◽  
2012 ◽  
Vol 49 (1) ◽  
pp. 135-151 ◽  
Author(s):  
G.A. Gazonas ◽  
A.P. Velo
Keyword(s):  
Analytical Solutions ◽  
Elastic Media ◽  
Transform Methods ◽  
Resonance Response
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