搜索结果: 1-15 共查到“物理学 resonance”相关记录97条 . 查询时间(0.125 秒)
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Fast Magnetic Resonance Imaging and Inverse Problems
快速 磁共振成像 逆问题
2023/4/17
磁共振成像是目前医学成像技术中功能最强大，技术门槛最复杂的技术之一。然而，相对其他成像模态较为缓慢的采集速度（较长的扫描时间）制约了磁共振成像在临床上的广泛应用。借助采样样本的数量与扫描时间的正比关系，通过减少采集的数据量（稀疏采样）来缩短磁共振采集时间是磁共振成像领域的重要途径，而从高度欠采样的数据中重建出高质量的图像可以近似为一个病态反问题，对这一问题的求解是快速磁共振成像领域的研究热点。本次...
If she hits just the right pitch, a singer can shatter a wine glass. The reason is resonance. While the glass may vibrate slightly in response to most acoustic tones, a pitch that resonates with the m...
Surface Nuclear Magnetic Resonance (SNMR) - A new method for exploration of ground water and aquifer properties
surface NMR ground water aquifer assessment hydrogeophysics
2015/9/29
The Surface Nuclear Magnetic Resonance (SNMR) method is a fairly new technique in geophysics to assess ground water, i.e. existence, amount and productibility by measurements at the surface. The NMR t...
Reactive oxygen species' role in endothelial dysfunction by electron paramagnetic resonance
endothelial dysfunction ex vivo spin trapping porcine tissue
2015/1/19
The endothelium is a single layer of cells lining the arteries and is involved in many physiological reactions which are responsible for vascular tone. Free radicals are important participants in thes...
Parity-violating photoproduction of pi(+/-) on the Delta resonance
Asymmetry of real - photon resonance asymmetric nonzero coupling dynamic hadron p-wave mystery hyperon in violation of the o 'hara theorem of weak radiation hyperon decay
2014/12/22
We analyze the real-photon asymmetry Aγ± for the parity-violating (PV) π± production on the Δ resonance via the reactions γ⃗+p→Δ+→π++n and γ⃗+d→Δ0+p→π-+p+p. This asymmetry is nonvanishing ...
Proton magnetic resonance spectroscopy reveals increased hepatic lipid content after a single high-fat meal with no additional modulation by added protein
H-MRS IHL IMCL postprandial protein
2018/12/20
Background: Fat accumulation in nonadipose tissue is linked to insulin resistance and metabolic diseases. Earlier studies have shown that hepatic lipid accumulation can occur after 4 d of a high-fat d...
P_11 Resonance Extracted from pi-N Data and Its Stability
pN scattering amplitude analysis Roper resonance
2011/7/20
We study the stability of resonance poles in pi-N P_11 partial wave, particularly the Roper resonance, by varying parameters significantly within the EBAC dynamical coupled-channels model, keeping a g...
Resonance theory for perturbed Hill operator
resonances scattering periodic potential S-matrix
2011/9/6
Abstract: We consider the Schr\"odinger operator $Hy=-y"+(p+q)y$ with a periodic potential $p$ plus a compactly supported potential $q$ on the real line. The spectrum of $H$ consists of an absolutely ...
Near-zero-field nuclear magnetic resonance
Near-zero-field nuclear magnetic resonance Atomic Physics
2011/8/3
Abstract: We investigate nuclear magnetic resonance (NMR) in near-zero-field, where the Zeeman interaction can be treated as a perturbation to the electron mediated scalar interaction (J-coupling). Th...
Cooperative resonance linewidth narrowing in a planar metamaterial
Cooperative resonance linewidth planar metamaterial
2011/9/7
We theoretically analyze the experimental observations of a spectral line collapse in a metamaterial array of asymmetric split ring resonators [Fedotov et al., Phys. Rev. Lett. 104, 223901 (2010)].We ...
The Friedrichs Model and its use in resonance phenomena
The Friedrichs Model resonance phenomena
2011/7/27
Abstract: We present here a relation of different types of Friedrichs models and their use in the description and comprehension of resonance phenomena. We first discuss the basic Friedrichs model and ...
Density Functional Resonance Theory of Unbound Electronic Systems
Density Functional Resonance Theory Electronic Systems
2011/9/14
Density Functional Resonance Theory (DFRT) is a complex-scaled version of ground-state Density Functional Theory (DFT) that allows one to calculate the resonance energies and lifetimes of metastable a...
P_11 Resonance Extracted from pi-N Data and Its Stability
P_11 Resonance Extracted pi-N Data Its Stability
2011/7/21
We study the stability of resonance poles in pi-N P_11 partial wave, particularly the Roper resonance, by varying parameters significantly within the EBAC dynamical coupled-channels model, keeping a g...
Pseudo resonance induced quasi-periodic behavior in stochastic threshold dynamics
Pseudo resonance quasi-periodic behavior stochastic threshold dynamics
2011/7/27
Abstract: Here we present a simple stochastic threshold model consisting of a deterministic slowly decaying term and a fast stochastic noise term. The process shows a pseudo-resonance, in the sense th...
Observation of the Fano Resonance in Gold Nanorods Supported on HighDielectric-Constant Substrates
dielectric function Fano resonance gold nanorod plasmon resonance scattering substrate
2014/5/28
Fano resonances in plasmonic nanostructures, characterized by their asymmetric resonance spectral profile, are currently attracting much interest due to their potential applications in biological sens...