Posts Tagged ‘polarized’

Polarized object detection in crabs: a two-channel system [RESEARCH ARTICLE]

Melanie Ailin Basnak, Veronica Perez-Schuster, Gabriela Hermitte, and Martin Beron de AstradaMany animal species take advantage of polarization vision for vital tasks such as orientation, communication, and contrast enhancement. Previous studies have …

A method for imaging and spectroscopy using γ-rays and magnetic resonance

Magnetic resonance imaging (MRI) provides fine spatial resolution, spectral sensitivity and a rich variety of contrast mechanisms for diagnostic medical applications. Nuclear imaging using γ-ray cameras offers the benefits of using small quantities of radioactive tracers that seek specific targets of interest within the body. Here we describe an imaging and spectroscopic modality that combines favourable aspects of both approaches. Spatial information is encoded into the spin orientations of tiny amounts of a polarized radioactive tracer using pulses of both radio-frequency electromagnetic radiation and magnetic-field gradients, as in MRI. However, rather than detecting weak radio-frequency signals, imaging information is obtained through the detection of γ-rays. A single γ-ray detector can be used to acquire an image; no γ-ray camera is needed. We demonstrate the feasibility of our technique by producing images and spectra from a glass cell containing only about 4 × 1013 atoms (about 1 millicurie) of the metastable isomer 131mXe that were polarized using the laser technique of spin-exchange optical pumping. If the cell had instead been filled with water and imaged using conventional MRI, then it would have contained more than 1024 water molecules. The high sensitivity of our modality expands the breadth of applications of magnetic resonance, and could lead to a new class of radioactive tracers.

Archived Webinar: Elections in America

What is the future of American political parties as we known them? Do Americans even care about the candidates’ positions? Do campaign visits and television ads really turn the dial in voting. Political scientists Larry Bartels, Lynn Vavreck and Gary Jacobsen — address these and other questions about the current presidential election in this archived webinar.

Did Einstein predict Quantum Entanglement in 1905?

Quantum entanglement is defined "as a physical phenomenon that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently instead, a quantum state may be given for the system as a whole. Einstein referred to this as "spooky action at […]

Nanometer-scale Defect Detection Using Polarized Light

  This book describes experimental and theoretical methods that are implemented within the framework of fundamental research to better understand physical and chemical processes at the nanoscale that are responsible for the remarkable prop…

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