Results 271 to 280 of about 1,482,446 (314)

Al double core electron excitation in asymmetric collisions

Surface Science, 1991
Abstract We report a detailed Auger study on the double 2p electron excitation in Al by bombarding polycrystalline Al with 5–15 keV noble gas ions (Ne+, Ar+, Kr+, and Xe+) and MgxAl1 − x alloys (x = 0, 0.25, 0.50, and 0.75) with Ar+ ions. Fo resolved spectra show three well distinct narrow atomic L2-Auger peaks at ~ 76, ~ 82, and ~ 85.5 eV which ...
XU, Fang, Camarca M, Oliva A, Mandarino N, Zoccali P, Bonanno A.   +5 more
openaire   +3 more sources

Parametric Excitation Under Multiple Excitation Parameters: Asymmetric Plates Under a Rotating Spring

13th Biennial Conference on Mechanical Vibration and Noise: Machinery Dynamics and Element Vibrations, 1991
Abstract A perturbation method is developed to predict stability of parametrically excited dynamic systems containing multiple perturbation parameters. This method, based on the Floquet theorem and the method of successive approximations, results in a nonlinear matrix eigenvalue problem whose eigenvalues are used to predict the system ...
Shen, I. Y., Mote, C. D. jun.
openaire   +2 more sources

Performance Improvement for Segmented-Stator Hybrid-Excitation SRM Drives Using an Improved Asymmetric Half-Bridge Converter

IEEE transactions on industrial electronics (1982. Print), 2019
This paper presents an improved asymmetric half-bridge converter (AHBC) to enhance the output performance of a segmented-stator hybrid-excitation switched reluctance motor (SSHE-SRM) drive.
Wen Ding, Shuai Yang, Yanfang Hu
semanticscholar   +1 more source

Excitation and relaxation of the asymmetric stretch mode of CO2 in a pulsed glow discharge

Plasma Sources Science & Technology, 2019
The excitation and relaxation of the vibrations of CO2 as well as the reduction of CO2 to CO are studied in a pulsed glow discharge. Two diagnostics are employed: (1) time-resolved in situ Fourier transform infrared spectroscopy and (2) spatiotemporally ...
B. Klarenaar, A. Morillo-Candas, M. Grofulović, M. Sanden, R. Engeln, O. Guaitella   +5 more
semanticscholar   +1 more source

Global Composite Learning Fixed-Time Control of Robotic Systems With Asymmetric Tracking Error Constraints

IEEE transactions on industrial electronics (1982. Print), 2023
Superior parameter convergence is desirable in adaptive robot control as it can enhance the overall stability of the closed-loop system. However, most current studies of adaptive robot control concentrate on parameter convergence in the steady state ...
Zhang Yu, Keli Pang, C. Hua
semanticscholar   +1 more source

Asymmetric Photoinduced Excited-State Nazarov Reaction

Journal of the American Chemical Society
We report herein the first asymmetric photoinduced excited-state Nazarov reaction of non-aromatic dicyclic divinyl ketones by using hydrogen-bonding catalysis. The enantioselectivity of photoinduced electrocyclization is highly dependent on the structural features of the substrate and its interaction with chiral catalysts.
Xuelong Qiao, Shaojun Zhai, Jiwei Xu, Haibing He, Xiao He, Lianrui Hu, Shuanhu Gao   +6 more
openaire   +2 more sources

Terahertz wave emission from a liquid water film under the excitation of asymmetric optical fields

Applied Physics Letters, 2018
Liquid water excited by intense two-color laser pulses radiates electromagnetic waves at terahertz frequencies. Compared with one-color excitation, two-orders of magnitude enhanced terahertz energy are observed by using asymmetric optical excitation with
Q. Jin, J. Dai, Y. E, Xicheng Zhang
semanticscholar   +1 more source

Excitations of a nonstationary asymmetrical singular oscillator

Il Nuovo Cimento B Series 11, 1974
The Schrodinger equation with a new nonstationary potential of the type 1/2ω2(t)r2 +f(θ, ϕ)r−2 is solved exactly. Normalized solutions and transition amplitudes between energy eigenstates are expressed in terms of Jacobi and Laguerre polynomials. Integrals of the motion are considered.
V. V. Dodonov, I. A. Malkin, V. I. Man’ko   +2 more
openaire   +1 more source

Asymmetric Ferroelectric-Gated Two-Dimensional Transistor Integrating Self-Rectifying Photoelectric Memory and Artificial Synapse.

ACS Nano, 2022
Ferroelectric field-effect transistors (Fe-FET) are promising candidates for future information devices. However, they suffer from low endurance and short retention time, which retards the application of processing memory in the same physical processes ...
Yurong Jiang, Linlin Zhang, Rui Wang, Hongzhi Li, Lin Li, S. Zhang, Xueping Li, Jian Su, Xiaohui Song, C. Xia   +9 more
semanticscholar   +1 more source

Asymmetric Bound States of Spiral Pairs in Excitable Media

Physical Review Letters, 2005
We present a stable regime of asymmetric bound states for spiral pairs in a generic numerical model of a homogeneous excitable medium. In this regime, one spiral tip (slave) rotates around the other (master). Master-slave dynamics occur for both same-chirality and opposite-chirality spiral pairs in a range of parameters and initial conditions. We study
Christian, Zemlin, Karthik, Mukund, Marcel, Wellner, Roman, Zaritsky, Arkady, Pertsov   +4 more
openaire   +2 more sources