The Hipparcos Transit Data are a collection of partially reduced, fully calibrated observations of (mostly) double and multiple stars obtained with the ESA Hipparcos astrometry satellite. The data are publicly available, as part of the CD-ROM set distributed with the Hipparcos and Tycho Catalogues (ESA SP–1200, 1997), for about a third of the Hipparcos Catalogue entries including all confirmed ...

The Hipparcos Transit Data are a collection of partially reduced, fully calibrated observations of (mostly) double and multiple stars obtained with the ESA Hipparcos astrometry satellite. The data are publicly available, as part of the CD-ROM set distributed with the Hipparcos and Tycho Catalogues (ESA SP–1200, 1997), for about a third of the Hipparcos Catalogue entries including all confirmed ...

• The development of the couutercnrrent hypothesis as an explanation for the osmotic gradient from cortex to papilla of the kidney has again stimulated investigation of the intrarenal distribution of blood flow. Theoretical considerations have emphasized the necessity of a relatively low medullary blood flow for the maintenance of this gradient. However, present methods of measuring renal blood...

Developmental venous anomalies (DVAs) are common variants of cerebral venous drainage that are typically incidental findings on contrast-enhanced MR imaging studies. We present four cases of asymptomatic DVAs that demonstrate increased cerebral blood flow, cerebral blood volume, mean transit time, and time to peak on perfusion MR images. Our study indicates that alterations in perfusion MR imag...

For more than a century, there has been interest in pulse wave velocity and pulse transit time as a possible metric for blood pressure and other cardiovascular parameters. The most common approach in noninvasive measurement of these metrics has been to measure the time delay between the QRS complex on the electrocardiograph and the detection of the finger photoplethysmograph. This paper introdu...

Pulse transit time (PTT) is the time taken for the arterial pulse pressure wave to travel from the aortic valve to a peripheral site. For convenience, it is usually measured from the R wave on the electrocardiogram to the pulse wave arrival at the finger. Pulse transit time is inversely proportional to blood pressure, and the falls in blood pressure which occur with inspiration (pulsus paradoxu...

An investigation was made of the effect of changing mean transit time (MTT) by administration of drugs which affect colonic motility on faecal microbial mass in man. Senokot was used to accelerate and codeine and/or loperamide to prolong transit in subjects maintained on a constant high fibre diet. Doses of Senokot or codeine/loperamide were adjusted to halve or double transit time measured dur...

The paper set out to investigate the effectiveness of the removals in transit (RIT) system in facilitating trade. The study wanted to establish whether the Removals in Transit system currently being used in Zimbabwe is effective enough, that is whether acquittals of entries are being done in the system properly or fraudulently. A sample size of 200 Zimbabwe Revenue Authority (ZIMRA) employees a...