We report new observations of the H 2 O megamaser in the Seyfert 2 galaxy Mrk 348. Following our initial detection in 2000 March using the Effelsberg 100 m telescope, re-analysis of previous data on this source indicates that the maser was present but only marginally detectable in late 1997. Monitoring through late 2000 shows that the maser has again decreased to its original level. The H 2 O l...

Determining the distributions of size and velocity of droplets formed at the end of primary breakup region is followed in this paper. The droplet formation stage at the end of primary breakup is random and stochastic and it can be modeled by statistical means based on the maximum entropy principle (MEP). The MEP formulation predicts the atomization process while satisfying constraint equations ...

Twelve human volunteers were studied to determine the effect of eye surface cooling on the parameters of the light reflex. Surface cooling resulted in a 38% decrease in the maximum constriction velocity and a 36% decrease in the maximum redilation velocity. These changes were thought to be the result of a "sluggish" response of the pupillary sphincter.

The objective of this study was to compare tissue Doppler imaging and speckle tracking ultrasound to assess the relative motion of flexor tendon and surrounding subsynovial connective tissue (SSCT). Twenty normal human wrists were imaged with an ultrasound scanner. The two ultrasound methods measured the excursion and maximum velocity of the tendon and SSCT while subjects gripped three differen...

Color Doppler (CD) is one of the most used ultrasound (US) techniques as it allows 2D representation blood flow. Even if a clarification on whether such technique provides qualitative or quantitative diagnostic information velocity assessment still awaited, necessity periodic Quality Control (QC) tests ongoing. Consequently, in present preliminary study, previously proposed sensitivity paramete...

The maximum entropy principle (MEP), which has been popular in the modeling of droplet size and velocity distribution in sprays, is, strictly speaking, only applicable for isolated systems in thermodynamic equilibrium; whereas the spray formation processes are irreversible and non-isolated with interaction between the atomizing liquid and its surrounding gas medium. In this study, a new model f...

Recent measurements conducted at the Arecibo Observatory report high-speed sporadic meteors having velocities near 50 km/s. The results seem to indicate a bimodal velocity distribution in the sporadic meteors (maxima at ∼20 km/s and ∼50 km/s). The particles have a maximum mass of ∼1μg. This paper will present an analysis of the ablation of 1μg meteoroids having velocities of 20, 30, 50, and 70 ...