Results 21 to 30 of about 2,194,885 (334)

Resonant control of stochastic spatio-temporal dynamics in a tunnel diode by multiple time delayed feedback [PDF]

, 2008
We study the control of noise-induced spatio-temporal current density patterns in a semiconductor nanostructure (double barrier resonant tunnelling diode) by multiple time-delayed feedback.
E. Schöll, Eckehard Schöll, M. Meixner, Niels Majer, R. L. Stratonovich   +4 more
core   +1 more source

Dynamical Generation of Noiseless Quantum Subsystems [PDF]

, 2000
We present control schemes for open quantum systems that combine decoupling and universal control methods with coding procedures. By exploiting a general algebraic approach, we show how appropriate encodings of quantum states result in obtaining ...
A. M. Steane, C. Search, D. A. Lidar, D. Vitali, E. Knill, E. Knill, Emanuel Knill, G. Burkard, G. S. Agarwal, L. M. Duan, L. Viola, L. Viola, L. Viola, Lorenza Viola, P. W. Shor, P. Zanardi, P. Zanardi, P. Zanardi, S. Lloyd, Seth Lloyd, U. Haeberlen, W. Thirring   +21 more
core   +2 more sources

Sound pressure-dependent acoustic absorption by perforated rigid-frame porous materials

Acta Acustica
Porous materials are one of the most common classes of sound absorbers for acoustic treatments. However, thin layers of these classical materials are not efficient at absorbing low-frequency sound waves, which is a practical shortcoming.
Cavalieri Théo, Van Damme Bart
doaj   +1 more source

Effect of impact ionization in the InGaAs absorber on excess noise of avalanche photodiodes [PDF]

, 2005
The effects of impact ionization in the InGaAs absorption layer on the multiplication, excess noise and breakdown voltage are modeled for avalanche photodiodes (APDs), both with InP and with InAlAs multiplication regions.
David, J.P.R., Ng, J.S., Rees, G.J., Tan, C.H.   +3 more
core   +2 more sources

Analysis of Flow Field Structure Characteristics of Dual Impinging Jets at Different Velocities

Aerospace
The flow structure and unsteady evolution characteristics of dual impinging jets represent a flow problem of significant engineering importance in the aerospace field.
Yifan Zhao, Yuxiang Liang, Xunnian Wang, Pengfei Yan, Jiaxi Zhao, Rongping Zhang   +5 more
doaj   +1 more source

Characterization of the aircraft bay/landing gear coupling noise at low subsonic speeds and its suppression using leading-edge chevron spoiler

Advances in Mechanical Engineering, 2019
When the aircraft opens the bay door to let the landing gear either drop or retract, the incoming flow will result in a significant amount of coupling noise from the bay and the landing gear.
Kun Zhao, Yong Liang, Tingrui Yue, Zhengwu Chen, Gareth J Bennett   +4 more
doaj   +1 more source

Comparative study of surface integral methods in aeroacoustic prediction

Frontiers in Physics, 2023
Introduction: Surface integral methods based on the acoustic analogy and Kirchhoff formulation are widely employed in computational aeroacoustics. The computational accuracy is usually highly dependent on the selections of the acoustic prediction method ...
Chen Xu, Shihao Wang, Dangguo Yang, Rongping Zhang, Shujie Jiang, Yijun Mao   +5 more
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Numerical modeling techniques for noise emission of free railway wheels

Railway Engineering Science
In this article, we consider the numerical prediction of the noise emission from a wheelset in laboratory conditions. We focus on the fluid–structure interaction leading to sound emission in the fluid domain by analyzing three different methods to ...
Linus Taenzer, Urs Pachale, Bart Van Damme, Andrea Bergamini, Domenico Tallarico   +4 more
doaj   +1 more source

A Method for Determining the Optimal Location of a Distributed Sensor/Actuator

Shock and Vibration, 1994
The optimal location problem of distributed sensor/actuator for observation and control of a flexible structure is investigated. Using a property of controllability and observability grammian matrices, this approach employs a nonlinear optimization ...
Byeongsik Ko, Benson H. Tongue, Andrew Packard   +2 more
doaj   +1 more source