Although the phenomenon of coherent backscattering (CBS) in nonbiological media has generated substantial research interest, observing CBS in biological tissue has been extremely difficult. Here we show that the combination of low-spatial-coherence, broadband illumination, and low-temporal-coherence, spectrally resolved detection significantly facilitates CBS observation in biological tissue an...

Turbulence motions are often perceived as chaotic and unstructured. It has been observed however that the turbulence is frequently organized in semi-regular, persistent and large-scale coherent structures in realistic boundary layers. This study investigates such coherent structures, called rolls, in the non-stratified (Ekman) boundary layer on a rotated planet (the Earth). Large-eddy simulatio...

We develop an accurate finite-time scaling analysis of the angular width of the coherent backscattering (CBS) peak for waves propagating in 3D random media. Applying this method to ultracold atoms in optical speckle potentials, we show how to determine both the mobility edge and the critical exponent of the Anderson transition from the temporal behavior of the CBS width. Our method could be use...

Coherent backscattering (CBS) of light in random media has been previously investigated by use of coherent light sources. Here we report a novel method of CBS measurement that combines low spatial coherence, broadband illumination, and spectrally resolved detection. We show that low spatial coherence illumination leads to an anomalously broad CBS peak and a dramatic speckle reduction; the latte...

Abstract With the improvement in anti-reconnaissance performance of new system radar, signals sent by radar are more and difficult to be detected, which brings challenges electronic reconnaissance. In order find enemy earlier, receiver usually needs high sensitivity detect weak signals. Therefore, according characteristics airborne PD pulses, a method parameter measurement based on non-coherent...

Transitional millisecond pulsars (tMSPs) switch between an accretion-powered state without radio pulsations and a rotation-powered state with radio pulsations. In the former state, they are X-ray bright, in the latter Xray dim. Soft X-ray transients (SXTs) undergo similar switches in X-ray, between “high” states with bright X-ray outbursts and a “low” state of quiescence. The upper limit on the...

Radio controlled clocks (RCCs) based on the WWVB broadcast, commonly referred to as “atomic clocks”, might experience relatively high levels of on-frequency interference from the equivalent MSF time-code broadcast from the UK, particularly on the East Coast. The problem may be further exacerbated by a random orientation of the RCC device, which might favor the reception of the interfering signa...

We present first results of the BeppoSAX observation of the Coma Cluster. Thanks to the unprecedented sensitivity of the PDS instrument, the source has been detected up to ∼80 keV. There is clear evidence for emission in excess to the thermal one above ∼25 keV, very likely of non-thermal origin. We have therefore, for the first time, detected the long sought Inverse Compton emission on CMB phot...

I summarize recent results from radio observations of high redshift star forming galaxies, discuss radio continuum emission as a measure of star formation rate, and consider future capabilities at cm to IR wavelengths. 1 Radio surveys to μJy sensitivity Source counts based on low frequency surveys of the sky with Jy sensitivity showed a significant departure from a Euclidean, non-evolving sourc...

Envelopes of coherent T -conditional possibilities and coherent T -conditional necessities are studied and an analysis of some inference rules which play an important role in nonmonotonic reasoning is