Multifrequency parameteric oscillations in electromechanical resonant systems. II. High pump level

1989 ◽  
Vol 32 (8) ◽  
pp. 709-713 ◽  
Author(s):  
G. V. Belokopytov ◽  
V. N. Semenenko ◽  
V. A. Chistyaev
Keyword(s):  
Pump Level ◽  
Resonant Systems ◽  
High Pump

scholarly journals Enhanced two-photon photoluminescence assisted by multi-resonant characteristics of a gold nanocylinder

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 4009-4019
Author(s):  
Artur Movsesyan ◽  
Gwénaëlle Lamri ◽  
Sergei Kostcheev ◽  
Anke Horneber ◽  
Annika Bräuer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Enhancement Factor ◽  
Second Harmonic ◽  
Plasmon Mode ◽  
Excitation Wavelength ◽  
Resonant System ◽  
Two Photon ◽  
Plasmon Resonances ◽  
Resonant Systems ◽  
Photoluminescence Enhancement

AbstractMulti-resonant plasmonic simple geometries like nanocylinders and nanorods are highly interesting for two-photon photoluminescence and second harmonic generation applications, due to their easy fabrication and reproducibility in comparison with complex multi-resonant systems like dimers or nanoclusters. We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode. We establish a method to separate experimentally the enhancement factor at the excitation and at the emission wavelengths for this double resonant system. The sensitivity of the spectral positions of the dipolar and quadrupolar plasmon resonances to the ellipticity of the nanocylinders and its impact on the two-photon photoluminescence enhancement are discussed.

Behavior of multilayer light-sensitive resonant systems at irradiation

1997 ◽  
Author(s):  
Y. A. Lupashko ◽  
V. V. Mussil ◽  
Alexander P. Ovcharenko
Keyword(s):  
Resonant Systems

Terahertz Characterization of External Resonant Systems by High-$T_{c}$ Josephson Junctions

2011 ◽  
Vol 21 (3) ◽  
pp. 306-310 ◽  
Author(s):  
Oleg Y. Volkov ◽  
Yuri Y. Divin ◽  
Vladimir N. Gubankov ◽  
Irina I. Gundareva ◽  
Valery V. Pavlovskiy
Keyword(s):  
Josephson Junctions ◽  
Resonant Systems

Optimal actuation of nonlinear resonant systems

2009 ◽  
Vol 41 (1) ◽  
pp. 65-86 ◽  
Author(s):  
Mohammad Kurdi ◽  
Philip Beran ◽  
Bret Stanford ◽  
Richard Snyder
Keyword(s):  
Resonant Systems

scholarly journals Enhanced avionic sensing based on Wigner’s cusp anomalies

2021 ◽  
Vol 7 (23) ◽  
pp. eabg8118
Author(s):  
Rodion Kononchuk ◽  
Joshua Feinberg ◽  
Joseph Knee ◽  
Tsampikos Kottos
Keyword(s):  
Cross Section ◽  
Linear Response ◽  
Nuclear Reactions ◽  
Exceptional Point ◽  
Small Perturbations ◽  
Differential Scattering Cross Section ◽  
Sensing Applications ◽  
Physical Observable ◽  
Resonant Systems ◽  
Square Root Singularity

Typical sensors detect small perturbations by measuring their effects on a physical observable, using a linear response principle (LRP). It turns out that once LRP is abandoned, new opportunities emerge. A prominent example is resonant systems operating near Nth-order exceptional point degeneracies (EPDs) where a small perturbation ε ≪ 1 activates an inherent sublinear response ∼εN≫ε in resonant splitting. Here, we propose an alternative sublinear optomechanical sensing scheme that is rooted in Wigner’s cusp anomalies (WCAs), first discussed in the framework of nuclear reactions: a frequency-dependent square-root singularity of the differential scattering cross section around the energy threshold of a newly opened channel, which we use to amplify small perturbations. WCA hypersensitivity can be applied in a variety of sensing applications, besides optomechanical accelerometry discussed in this paper. Our WCA platforms are compact, do not require a judicious arrangement of active elements (unlike EPD platforms), and, if chosen, can be cavity free.

scholarly journals Artificial neural networks for inverse design of resonant nanophotonic components with oscillatory loss landscapes

Nanophotonics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 385-392
Author(s):  
Joeri Lenaerts ◽  
Hannah Pinson ◽  
Vincent Ginis
Keyword(s):  
Machine Learning ◽  
Optimization Procedure ◽  
Linear Mapping ◽  
Inverse Design ◽  
Design Parameters ◽  
Second Step ◽  
Input Parameters ◽  
Novel Variant ◽  
Resonant Systems ◽  
The Fourier Transform

AbstractMachine learning offers the potential to revolutionize the inverse design of complex nanophotonic components. Here, we propose a novel variant of this formalism specifically suited for the design of resonant nanophotonic components. Typically, the first step of an inverse design process based on machine learning is training a neural network to approximate the non-linear mapping from a set of input parameters to a given optical system’s features. The second step starts from the desired features, e.g. a transmission spectrum, and propagates back through the trained network to find the optimal input parameters. For resonant systems, this second step corresponds to a gradient descent in a highly oscillatory loss landscape. As a result, the algorithm often converges into a local minimum. We significantly improve this method’s efficiency by adding the Fourier transform of the desired spectrum to the optimization procedure. We demonstrate our method by retrieving the optimal design parameters for desired transmission and reflection spectra of Fabry–Pérot resonators and Bragg reflectors, two canonical optical components whose functionality is based on wave interference. Our results can be extended to the optimization of more complex nanophotonic components interacting with structured incident fields.

The Research and Application of Cementing Isolation Technology in High Porosity and Permeability of Developed Clastic Rock Reservoir in Tarim Basin

2021 ◽  
Author(s):  
Hongtao Liu ◽  
Zhengqing Ai ◽  
Jingcheng Zhang ◽  
Zhongtao Yuan ◽  
Jianguo Zeng ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Water Layer ◽  
High Porosity ◽  
Self Healing ◽  
Cement Slurry ◽  
Clastic Rock ◽  
Pump Rate ◽  
Porosity And Permeability ◽  
Zonal Isolation ◽  
High Pump

Abstract The average porosity and permeability in the developed clastic rock reservoir in Tarim oilfield in China is 22.16% and 689.85×10-3 μm2. The isolation layer thickness between water layer and oil layer is less than 2 meters. The pressure of oil layer is 0.99 g/cm3, and the pressure of bottom water layer is 1.22 g/cm3, the pressure difference between them is as bigger as 12 to 23 MPa. It is difficult to achieve the layer isolation between the water layer and oil layer. To solve the zonal isolation difficulty and reduce permeable loss risk in clastic reservoir with high porosity and permeability, matrix anti-invasion additive, self-innovate plugging ability material of slurry, self-healing slurry, open-hole packer outside the casing, design and control technology of cement slurry performance, optimizing casing centralizer location technology and displacement with high pump rate has been developed and successfully applied. The results show that: First, the additive with physical and chemical crosslinking structure matrix anti-invasion is developed. The additive has the characteristics of anti-dilution, low thixotropy, low water loss and short transition, and can seal the water layer quickly. Second, the plugging material in the slurry has a better plugging performance and could reduce the permeability of artificial core by 70-80% in the testing evaluation. Third, the self-healing cement slurry system can quickly seal the fracture and prevent the fluid from flowing, and can ensuring the long-term effective sealing of the reservoir. Fourth, By strict control of the thickening time (operation time) and consistency (20-25 Bc), the cement slurry can realize zonal isolation quickly, which has achieved the purpose of quickly sealing off the water layer and reduced the risk of permeable loss. And the casing centralizers are used to ensure that the standoff ratio of oil and water layer is above 67%. The displacement with high pump rate (2 m3/min, to ensure the annular return velocity more than 1.2 m/s) can efficiently clean the wellbore by diluting the drilling fluid and washing the mud cake, and can improve the displacement efficiency. The cementing technology has been successfully applied in 100 wells in Tarim Oilfield. The qualification rate and high quality rate is 87.9% and 69% in 2019, and achieve zone isolation. No water has been produced after the oil testing and the water content has decreased to 7% after production. With the cementing technology, we have improved zonal isolation, increased the crude oil production and increased the benefit of oil.

Resonances in 16O+16O and the Systematic Occurrence of Jπ=8+ Resonances in Heavy Ion Resonant Systems

2005 ◽  
pp. 407-408
Author(s):  
M. Gai ◽  
E. C. Schloemer ◽  
J. E. Freedman ◽  
A. C. Hayes ◽  
S. K. Korotky ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Resonant Systems

REQUIRING HIGH PUMP SPEED MAY PREDICT LONG-TERM MORTALITY AFTER CF-VAD INSERTION

2015 ◽  
Vol 31 (10) ◽  
pp. S137-S138
Author(s):  
H. Kawajiri ◽  
L. Goldraich ◽  
F. Foroutan ◽  
A. Ghashghai ◽  
J. Lazarte ◽  
...  
Keyword(s):  
Pump Speed ◽  
High Pump ◽  
Long Term Mortality
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