Results 31 to 40 of about 436,125 (330)
Absolute versus convective helical magnetorotational instability in a Taylor-Couette flow [PDF]
Phys. Rev. E 79, e046310 (2009), 2008 We analyze numerically the magnetorotational instability of a Taylor-Couette flow in a helical magnetic field (HMRI) using the inductionless approximation defined by a zero magnetic Prandtl number (Pm=0). The Chebyshev collocation method is used to calculate the eigenvalue spectrum for small amplitude perturbations.
arxiv +1 more source
Insights into Imaging, 2020 Purpose This study aimed to calculate an applicable relative ratio threshold value instead of the absolute threshold value for simultaneous 68Ga prostate-specific membrane antigen/positron emission tomography ([68Ga]Ga-PSMA-11 PET) in patients with ...
Jing Zhao +3 more
doaj +1 more source
Determination of an optimal standardized uptake value of fluorodeoxyglucose for positron emission tomography imaging to assess pathological volumes of cervical cancer: a prospective study. [PDF]
PLoS ONE, 2013 PURPOSE: To determine the optimal standardized uptake value (SUV) of (18)F-fluorodeoxyglucose ((18)F-FDG) for positron emission tomography (PET) imaging, at which the PET-defined gross tumor volume (GTVPET) best matches with the pathological volume ...
Ying Zhang +13 more
doaj +1 more source
Dynamic instability of speckle patterns in nonlinear random media [PDF]
J. Opt. Soc. Am. B 21(1) 168-176 (2004), 2003 Linear stability analysis of speckle pattern resulting from multiple, diffuse scattering of coherent light waves in random media with intensity-dependent refractive index (noninstantaneous Kerr nonlinearity) is performed. The speckle pattern is shown to become unstable with respect to dynamic perturbations within a certain frequency band, provided that
arxiv +1 more source
Hemispheric lateralization of motor thresholds in relation to stuttering.
PLoS ONE, 2013 Stuttering is a complex speech disorder. Previous studies indicate a tendency towards elevated motor threshold for the left hemisphere, as measured using transcranial magnetic stimulation (TMS). This may reflect a monohemispheric motor system impairment.
Per A Alm +3 more
doaj +1 more source
Predicting Relative Thresholds for Object Oriented Metrics [PDF]
arXiv, 2021 Object-oriented software metrics provide a numerical characterization of software quality. They have also been used in the assessment and identification of technical debt. However, metrics generally need to be used with thresholds as reference points that help to interpret their values properly and objectively. The problem is that, while there are many
arxiv
Bound electron nonlinearity beyond the ionization threshold [PDF]
Phys. Rev. Lett. 120, 183901 (2018), 2018 Although high field laser-induced ionization is a fundamental process underlying many applications, there have been no absolute measurements of the nonlinear polarizability of atoms and molecules in the presence of ionization. Such information is crucial, for example, for understanding the propagation of high intensity ultrashort pulses in matter. Here,
arxiv +1 more source
Postnatal development of absolute auditory thresholds in kittens. [PDF]
Journal of Comparative and Physiological Psychology, 1981 Postnatal development of absolute auditory thresholds in the kitten was behaviorally measured from birth up to 1 mo of age. Unconditioned reactions to pure tones were observed for kittens up to Day 12, and conditioned responses were used for animals from Day 10 onward.
Ehret, Günter, Romand, Raymond
openaire +3 more sources
Normal limits for oscillometric bronchodilator responses and relationships with clinical factors
ERJ Open Research, 2021 Introduction We aimed to determine normal thresholds for positive bronchodilator responses for oscillometry in an Australian general population sample aged ≥40 years, to guide clinical interpretation. We also examined relationships between bronchodilator
Kanika Jetmalani +14 more
doaj +1 more source
Existence of absolutely continuous spectrum for Galton-Watson random trees [PDF]
arXiv, 2021 We establish a quantitative criterion for an operator defined on a Galton-Watson random tree for having an absolutely continuous spectrum. For the adjacency operator, this criterion requires that the offspring distribution has a relative variance below a threshold.
arxiv