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Peering into the dark (ages) with low-frequency space interferometers: Using the 21-cm signal of neutral hydrogen from the infant universe to probe fundamental (Astro)physics.
Exp Astron (Dordr)
September 2021
Observatoire de Paris, Paris, France.
The Dark Ages and Cosmic Dawn are largely unexplored windows on the infant Universe (z ~ 200-10). Observations of the redshifted 21-cm line of neutral hydrogen can provide valuable new insight into fundamental physics and astrophysics during these eras that no other probe can provide, and drives the design of many future ground-based instruments such as the Square Kilometre Array (SKA) and the Hydrogen Epoch of Reionization Array (HERA). We review progress in the field of high-redshift 21-cm Cosmology, in particular focussing on what questions can be addressed by probing the Dark Ages at z > 30.
View Article and Find Full Text PDFPeering into the window of receptivity: extracellular vesicles containing small noncoding RNAs as potential biomarkers.
Fertil Steril
May 2021
Reproductive Medicine Associates of New Jersey, Basking Ridge, New Jersey; Thomas Jefferson University, Philadelphia, Pennsylvania.
I propose to use as a window the dark core of an optical vortex to examine a weak background signal hidden in the glare of a bright coherent source. Applications such as the detection of an astronomical object, forward-scattered radiation, and incoherent light are described whereby signal enhancements of at least 7 orders of magnitude may be achieved.
View Article and Find Full Text PDFJugular venous pulse: window into the right heart.
South Med J
October 2007
Cardiology Service, Walter Reed Army Medical Center, Washington, DC 20307-5001, USA.
Although physicians began associating conspicuous neck veins with heart disease almost three centuries ago, the jugular venous pulse remains an often ignored component of the physical examination. Many physicians have not invested in the necessary understanding of the technique, and there is a misconception that its examination is difficult and of limited clinical value. When performed properly, evaluation of the jugular venous pulse can be extremely useful in distinguishing the cause of dyspnea and edema.
View Article and Find Full Text PDFLaser triangulation for liquid film thickness measurements through multiple interfaces.
Appl Opt
July 2006
Department of Mechanical Engineering, Oregon State University, Corvallis, Oregon 97331, USA.
Laser triangulation is used to measure the thickness of a liquid film in a test section consisting of a quartz viewing window, a water layer, and a hydrophobic membrane. The triangulation sensor acquires measurements to the bounding surfaces of the film while peering through multiple interfaces. This allows the difference between the two measurements to constitute the local film thickness.
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