An attenuation-based method to retrieve vertical profiles of rainfall rate from vertically pointing Ka-band radar measurements has been refined and adjusted for use with the U.S. Department of Energy’s cloud radars deployed at multiple Atmospheric Radiation Program (ARM) test bed sites. This method takes advantage of the linear relationship between the rainfall rate and the attenuation coeffici...

Using simultaneous S and Ka band observations it is possible to retrieve a path integrated value of the water vapor content as well as cloud liquid water content values using the atmospheric and liquid water attenuation properties at the two frequencies. Recently the NCAR S-band dual polarimetric (S-Pol) radar has been upgraded to include simultaneous Ka-band radar measurements (Farquharson et ...

A 32-GHz (Ka-band) breadboard has been developed to demonstrate M -ary phase-shift keyed (PSK) and M -ary quadrature amplitude modulation (QAM) Ka-band modulations using a ×3 8-GHz (X-band) architecture. This breadboard consists of an X-band vector modulator that is driven by a field programmable gate array. The signal is mixed with an upconverted 24-GHz signal to give the Ka-band modulated out...

Uranium-thorium dating of speleothems from two caves in the Junee-Florentine karst, Tasmania, provides some age constraints for associated clastic sediments including coarse dolerite-rich fluvial gravels, which underlie the three oldest dated speleothems. The results suggest minimum ages of 15 ± 5 ka, ~325 ka and >350 ka (two dates) for the gravels, implying that they are considerably older tha...

U-Th and 14C dating, and X-ray diffraction of parts of 16 submerged speleothems taken from depths of 1.5−41.5 m from 7 submarine caves and pits along the Eastern Adriatic coast, provided insight into the sea-level fl uctuations during the last 220 ka, and to the palaeogeographic changes caused by sea-level changes. Due to climate changes, palaeoenvironmental settings also varied, but not so abr...

We prove that there exists a set S of n points in the plane such that every n-vertex planar graph G admits a planar drawing in which every vertex of G is placed on a distinct point of S and every edge of G is drawn as a circular arc. Submitted: October 2013 Reviewed: February 2014 Revised: March 2014 Accepted: April 2014 Final: May 2014 Published: May 2014 Article type: Regular paper Communicat...

1.0 ABSTRACT The Advanced Communications Technology Satellite (ACTS) program was slated for decommissioning in October 2000 as was announced at the 6 th Ka-band Utilization Conference in May 2000. Quite a celebration was had at that event too centering on the decommissioning of this very successful technology program [ 1]. With plans in place to move the spacecraft to an orbital graveyard and t...

Let K be a field with char(K) 6= 2. Let us fix an algebraic closure Ka of K. Let us put Gal(K) := Aut(Ka/K). If X is an abelian variety of positive dimension over Ka then we write End(X) for the ring of all its Ka-endomorphisms and End (X) for the corresponding (semisimple finite-dimensional) Q-algebra End(X)⊗ Q. We write EndK(X) for the ring of all K-endomorphisms of X and End 0 K(X) for the c...