Abstract Whether river flows remain stationary is of great concern to hydrologists, water engineers, and society in general, yet subject substantial debate. Here we provide the first comprehensive assessment long-term stationarity annual streamflow for 11 069 catchments globally. Our observation-based evidence shows that remains 79% with minimal human disturbance, indicating historical climate ...

GSN 069 is an ultra-soft X-ray active galactic nucleus that previously exhibited a huge outburst and subsequent long-term decay. It has recently presented quasi-periodic eruptions (QPEs). We report the detection of strong nitrogen lines but weak or undetectable carbon in its far ultraviolet spectrum. With detailed photoionization model, we use C IV/N IV] ratio other ratios between to constrain ...

OBJECTIVES The echocardiographic contrast-enhancing effects and safety profile of ALBUNEX (a suspension of air-filled albumin microspheres) were compared with the new contrast agent OPTISON (formerly FS069: a suspension of albumin microspheres containing the gas perfluoropropane) in 203 patients with inadequate noncontrast echocardiograms. BACKGROUND The efficacy of ALBUNEX has been limited b...

Blueand red-shifted Hydrogen and Helium satellite recombination lines have recently been discovered in the optical spectra of at least two supersoft X-ray sources (SSSs), RX J0513-069 and RX J0019.8+2156, and tentatively also in one short-period cataclysmic variable star (CV), the recurrent nova T Pyx. These features are thought to provide evidence for the presence of highly collimated jets in ...

We present an imaging and spectroscopic survey of galaxies in fields around QSOs HE 0226−4110, PKS 0405−123, and PG 1216+069. The fields are selected to have ultraviolet echelle spectra available, which uncover 195 Lyα absorbers and 13 OVI absorbers along the three sightlines. We obtain robust redshifts for 1104 galaxies of rest-frame absolute magnitude MR −5log h . −16 and at projected physica...