Results 1 - 10 of 6,722

Brain magnetic resonance imaging with contrast dependent on blood oxygenation.

by S Ogawa , T M Lee , A R Kay , D W Tank - Proc. Natl. Acad. Sci. USA , 1990
"... ABSTRACT Paramagnetic deoxyhemoglobin in venous blood is a naturally occurring contrast agent for magnetic resonance imaging (MRI). By accentuating the effects of this agent through the use of gradient-echo techniques in high fields, we demonstrate in vivo images of brain microvasculature with imag ..."
Abstract - Cited by 648 (1 self) - Add to MetaCart
to regional neural activity. Magnetic resonance imaging (MRI) is a widely accepted modality for providing anatomical information. Current research (1) involves extending MRI methods to provide information about biological function, in addition to the concomitant anatomical information. In addition

Ecology of the family as a context for human development: Research perspectives.

by Urie Bronfenbrenner , Josephine Arastah , Mavis Hetherington , Richard Lerner , Jeylan T Mortimer , Joseph H Pleck , Lea Pulkinnen , Michael Rutter , Klaus Schneewind , Diana Slaughter - Developmental Psychology, , 1986
"... This review collates and examines critically a theoretically convergent but widely dispersed body of research on the influence of external environments on the functioning of families as contexts of human development. Investigations falling within this expanding domain include studies of the interac ..."
Abstract - Cited by 518 (0 self) - Add to MetaCart
This review collates and examines critically a theoretically convergent but widely dispersed body of research on the influence of external environments on the functioning of families as contexts of human development. Investigations falling within this expanding domain include studies

Approximate plasma dispersion functions

by Q. Luo, D. B. Melrose , 2004
"... at relativistic temperatures ..."
Abstract - Cited by 4 (0 self) - Add to MetaCart
at relativistic temperatures

Relativistic quantum plasma dispersion functions

by D B Melrose, J I Weise, J Mcorist , 2006
"... Abstract. Relativistic quantum plasma dispersion functions are defined and the longitudinal and transverse response functions for an electron (plus positron) gas are written in terms of them. The dispersion is separated into Landau-damping, paircreation and dissipationless regimes. Explicit forms ar ..."
Abstract - Add to MetaCart
Abstract. Relativistic quantum plasma dispersion functions are defined and the longitudinal and transverse response functions for an electron (plus positron) gas are written in terms of them. The dispersion is separated into Landau-damping, paircreation and dissipationless regimes. Explicit forms

Online Monitoring of Dispersion Functions and Transfer

by P. Emma, T. H. Fieguth, T. Lohse, R. S. Fanvwi - Matrices at the SLC,” Nucl. Instrum. Meth. A288,313 , 1990
"... The symmetries of the chromatic correction sections in the SLC Final Focus System allow thigh-resolution determination of the puke-to-palse energy fluctuations by exploiting the information from beam position monitors (BPMs) in regions of large dispersion. By correlating this signal with other BPMs, ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
, one can infer the dispersion function as well at spatial components of transfer matrices anywhere in the arc * and the Final Focus System without interrupting normal machine operation. We present results from data recorded during either periods of stable operation or periods when the linac energy

Semiparametric modeling and estimation of the dispersion function in regression

by Ingrid Van, Keilegom Lan Wangy , 2008
"... Modeling heteroscedasticity in semiparametric regression can improve the ef-ciency of the estimator of the parametric component in the regression function, and is important for inference problems such as plug-in bandwidth selection and the construction of condence intervals. However, the literature ..."
Abstract - Add to MetaCart
. Moreover, the approaches used in exist-ing work need to assume smooth objective functions, therefore exclude the emerging important class of semiparametric quantile regression models. To overcome these drawbacks, we propose a general semiparametric location-dispersion regression framework, which enriches

W) FIRST ORDER VARIATION OF THE DISPERSION FUNCTION WITH PARTICLE ENERGY DEVIATION*

by J. P Delahaye, J. Jaeger , 1984
"... The variation of the dispersion function with the particle energy deviation can presently be calculated from second order transfer matrices (l121; its periodic solution is determined numeri-cally. The general differential equations for the dispersion function deduced from the complete equation of mo ..."
Abstract - Add to MetaCart
The variation of the dispersion function with the particle energy deviation can presently be calculated from second order transfer matrices (l121; its periodic solution is determined numeri-cally. The general differential equations for the dispersion function deduced from the complete equation

EVOLUTION OF THE VELOCITY-DISPERSION FUNCTION OF LUMINOUS RED GALAXIES: A HIERARCHICAL BAYESIAN MEASUREMENT

by Yiping Shu, Adam S. Bolton, David J. Schlegel, Kyle S. Dawson, David A. Wake, Joel R. Brownstein, Jon Brinkmann, Benjamin A. Weaver
"... and other research outputs Evolution of the velocity-dispersion function of luminous red galaxies: a hierarchical Bayesian measurement ..."
Abstract - Add to MetaCart
and other research outputs Evolution of the velocity-dispersion function of luminous red galaxies: a hierarchical Bayesian measurement

(A)- Rev. ONLINE MONITORING OF DISPERSION FUNCTIONS AND TRANSFER MATRICES AT THE SLC*

by P. Emma, T. H. Fieguth, T. Lohse , 1989
"... The symmetries of the chromatic correction sections in the Stanford Linear Collider Final Focus System allows a high-resolution determination of the pulse-to-pulse e’ energy fluctuations by exploiting the information from beam position monitors (BPMs) in regions of large dispersion. By correlating t ..."
Abstract - Add to MetaCart
this signal with other BPMs, one can infer the dispersion function, as well as spatial components of transfer matrices anywhere in the arcs and the Final Focus System without interrupting the normal machine operation. We present results from data samples which were recorded during both periods of stable

Paper 53 The Dispersion Function of a Quasi Two-Dimensional Periodic Sandwich using a Dirichlet-to-Neumann Map

by N T Bagraev , G J Martin , B S Pavlov , A M Yafyasov , L I Goncharov , A V Zubkova
"... Abstract A quasi two-dimensional periodic B-Si-B sandwich structure reveals surprising properties, including high-temperature superconductivity at 145 . This effect can be interpreted as superconductivity-gap (SC-gap) enhancing resulting from hybridisation of Bloch-functions of the weakly interacti ..."
Abstract - Add to MetaCart
′′ + q(x)u = λu, q(x + a) = q(x). The quasi-momentum exponential e ipa ≡ µ and the corresponding dispersion function λ = λ(p) are found from the quadratic equation µ+µ −1 = Tr T containing the trace of
Results 1 - 10 of 6,722