Throughout most of the history of radio interferometry studies of Active Galactic Nuclei (AGN) using VLBI, attempts to extract physically meaningful information from VLBI observations have been dominated by visibility-based approaches to analysis, such as model fitting of the self-calibrated visibility data. This approach has been extremely valuable in multi-epoch studies of superluminal motion...

We studied dive patterns of northern elephant seals, that consisted of measurements of time vs. depth, by applying several time series based techniques. A primary feature of these patterns is diel variation in dive duration and maximal dive depth. Time series analysis of this variation over a two month period of continuous diving revealed an apparent cir-cadian rhythm. The consistency of this r...

AIMS To evaluate a sleep study service for children suspected of having sleep related upper airway obstruction (SRUAO). DESIGN Prospective survey. SETTING Paediatric and ear, nose, and throat clinics of the Royal Free Hampstead NHS Trust. SUBJECTS Consecutively referred children with SRUAO symptoms. MAIN OUTCOME MEASURES Sleep study data, referring clinician's impression, and completed ...

Pseudo-patient studies are studies in which a medical sociologist or anthropologist masquerades as a patient. Medical treatment is sought without revealing that the 'patient' is really a covert research worker. When access has thus been gained to a medical setting--typically a hospital ward--social interaction between medical staff and patients is then observed over a period of days or weeks. I...

There is growing concern that a substantial proportion of scientific research may in fact be false. A number of factors have been proposed as contributing to the presence of a large number of false-positive results in the literature, one of which is publication bias. We discuss empirical evidence for these factors.

this paper studies the sequential sampling scheme, as a solution to the problem of aliasing, where the sampling interval is restricted to a minimum allowable value d t. in the sequential sampling, the signal is sampled at intervals of d t, d t+ dt , d t+2 dt , d t+3 dt , ...; where dt < d t and may be selected as desirable. the sequential sampling is, however, analyzed and it is proven that, wh...

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