A new method to estimate the Doppler beaming factor of relativistic large-scale jet regions is presented. It is based on multiwaveband fitting to radio-to-X-ray continua with synchrotron spectrum models. Combining our method with available observational data of proper motions, we derive the intrinsic velocity as well as the viewing angles to the line of sight for eight knotty regions down the M...

Recent studies of impinging jet flows have shown that momentum and heat transfer can be significantly improved if the jet flow is pulsed (Zumbrunnen, 1996). Moreover, when the jet holes are elliptical, jet free surfaces are formed into a helical structure. These helical structures in a jet flow can be readily observed by squeezing a garden hose into an elliptic shape. Upon pulsating the jet flo...

The present study experimentally investigated a new hybrid cooling scheme by combination of a microchannel heat sink with a micro-synthetic jet actuator. The heat sink consisted of a single rectangular microchannel measured 550 μm wide, 500 μm deep and 26 mm long. The synthetic jet actuator with a 100 μm diameter orifice was placed right above the microchannel and 5 mm downstream from the chann...

Jet lag sleep disorder and shift work sleep disorder are the result of dyssynchrony between the internal clock and the external light-dark cycle, brought on by rapid travel across time zones or by working a nonstandard schedule. Symptoms can be minimized by optimizing the sleep environment, by strategic avoidance of and exposure to light, and also with drug and behavioral therapies.

We present the results of a multi-epoch radio monitoring campaign measuring the milliarcsecond structure of the jet in the radio-quiet quasar PG1407+263. This is the highest-sensitivity, highestresolution multi-year study of a distant active galaxy. The observations are naturally explained in terms of a beamed relativistic jet, some of whose fluctuations in flux density can be ascribed to inter...

Several topics from the wide field of QCD studies in Deep-inelastic ep Scattering at HERA are addressed. They include QCD analyses of the inclusive cross section with the determination of α s and the proton gluon density from the F 2 scaling violations, and the determination of the longitudinal structure function F L. QCD analyses of inclusive jet and dijet data are also presented. Finally jet ...

The substructure of jets has been studied in terms of the jet shape and subjet multiplicity and these quantities used to tag gluonand quark-initiated jets. Cross sections are presented for gluonand quark-tagged jets which exhibit the expected behaviour of the underlying parton dynamics. The value of αs(MZ ) of αs(MZ ) = 0.1176 ± 0.0009(stat.) +0.0009 −0.0026 (exp.) −0.0072 (th.) was extracted f...

Nuclear facilities have not been designed to withstand a deliberate crash by a jumbo jet full of fuel or many other types of attack. A successful attack could have widespread and catastrophic consequences for both the environment and public health. The extent of damage caused will depend on the type of nuclear facility, the nature of the attack, weather conditions and the success of mitigation ...