Results 311 to 320 of about 1,799,934 (343)

The Phase Encoding Gradient

1989
The y gradient is applied in the direction perpendicular to the coronal plane. Now it would seem that we could be able to use frequency in this direction just as we did for the x axis. However, if we did that, then we would not be able to uniquely specify whether a given frequency belonged to the x or the y axis, and the computer would get confused and
openaire   +1 more source

Fresnel diffraction due to phase gradient singularity

Optics Letters, 2018
In this Letter, a singularity in the phase gradient is introduced as a new origin of the diffraction from phase objects. The continuity in the amplitude and phase of the wave and the singularity in the phase gradient are assumed to describe this phenomenon.
Ehsan A. Akhlaghi, Ahad Saber, Zahra Abbasi   +2 more
openaire   +2 more sources

Phase separation under a weak concentration gradient

Physical Review Letters, 1992
Phase separation dynamics is studied in a density-matched liquid mixture in the presence of a weak linear concentration gradient. This novel situation enables nucleation and spinodal decomposition to be studied simultaneously. We observe at all quench depths (i) a central zone of nearly constant concentration width where interconnected domains grow ...
, Jayalakshmi, , Khalil, , Beysens
openaire   +2 more sources

Pure phase encode magnetic field gradient monitor

Journal of Magnetic Resonance, 2009
Numerous methods have been developed to measure MRI gradient waveforms and k-space trajectories. The most promising new strategy appears to be magnetic field monitoring with RF microprobes. Multiple RF microprobes may record the magnetic field evolution associated with a wide variety of imaging pulse sequences.
Hui, Han, Rodney P, MacGregor, Bruce J, Balcom   +2 more
openaire   +2 more sources

Phase behavior of gradient copolymers

AIP Conference Proceedings, 2000
Phase properties of gradient AB copolymer melts which consist of chains with the specified chemical distribution of A and B monomers have been studied within the Landau-Ginzburg model. All the melts with the linear distribution of the monomers exhibit only a direct continuous phase transition from disordered to the lamellar phase.
openaire   +1 more source

Microfabricated refractive index gradient based detector for reversed-phase liquid chromatography with mobile phase gradient elution

Journal of Chromatography A, 2006
Typical refractive index (RI) detectors for liquid chromatography (LC) are not well suited to application with mobile phase gradient elution, due to the difficulty in correcting for the detected baseline shift during the gradient. We report a sensitive, highly reproducible, microfabricated refractive index gradient (micro-RIG) detector that performs ...
Adam D, McBrady, Robert E, Synovec
openaire   +2 more sources

pH/Organic Solvent Double-Gradient Reversed-Phase HPLC

Analytical Chemistry, 2004
A new reversed-phase high-performance liquid chromatographic (RP HPLC) procedure has been theoretically and experimentally established. The approach consists of the simultaneous development of a gradient of pH and of the organic modifier in the mobile phase.
Paweł, Wiczling, Michał J, Markuszewski, Michał, Kaliszan, Roman, Kaliszan   +3 more
openaire   +2 more sources

Linear-polarization–gradient-phase coupling

Physical Review A, 2022
Shangdong Zhao, Yu Liu, Kai Niu, Shaohua Tao   +3 more
openaire   +1 more source

Generalized Gradient Theory for Silica Phase Transitions

Physical Review Letters, 1996
Density functional theory based on the generalized gradient approximation to the exchange and correlation energy is shown to correct a qualitative error of the local density approximation in describing a high-pressure phase transition of ${\mathrm{SiO}}_{2}$.
openaire   +2 more sources

Planning for post‐pandemic cancer care delivery: Recovery or opportunity for redesign?

Ca-A Cancer Journal for Clinicians, 2021
Pelin Cinar, Daniela A Bota, Kathryn A Gold   +2 more
exaly