排序方式: 共有45条查询结果,搜索用时 15 毫秒
41.
42.
Northern Latium (Italy) is an area where the Rn risk rate is potentially high because of the extensive outcropping of Neogene
U-rich volcanics and the presence of major active tectonic lineaments. The lack of data on Rn risk rates in that area, which
is undergoing major urban and industrial development, has prompted this study. It proposes a methodology to evaluate the maximum
potential diffusive Rn flux from soils based on the measurement of 226Ra, 232Th and 40K activities by γ-ray spectrometry, and the measurement of main soil parameters influencing the Rn emanation. This methodology
provides a simple, reliable and low-cost tool for drawing up radon flux maps useful to both public planners and private individuals,
who want to operate safely in the study area. The proposed methodology may also be applied to other geographic areas outside
the prescribed study area. 相似文献
43.
Umberto Nicolini Joaquin Santolaya Corinne Hubinont Nicholas Fisk Darryl Maxwell Charles Rodeck 《黑龙江环境通报》1989,9(3):191-194
Fetal intraperitoneal infusion of saline was performed in two patients with severe oligohydramnios at 24 and 25 weeks' gestation in order to enhance visualization of intra-abdominal organs. Renal agenesis was easily diagnosed. The technique can be considered as an alternative to artificial instillation of amniotic fluid in the differential diagnosis of conditions associated with severe oligohydramnios. 相似文献
44.
Kathrin Baumann Harald Maurer Gabriele Rau Martin Piringer Ulrike Pechinger Andr Prvt Markus Furger Bruno Neininger Umberto Pellegrini 《Atmospheric environment (Oxford, England : 1994)》2001,35(36):897
During the Mesoscale Alpine Programme (MAP) special observation period (SOP) between 7 September and 15 November 1999, ground-based and airborne measurements have been conducted in the Rhine valley south of the Lake of Constance to investigate the unstationary aspects of Foehn and related phenomena, like the impact of Foehn on the ozone concentrations in the valley. Foehn events occurred with above-average frequency and high diversity. Foehn induced ozone peaks in October and November are found to be much lower than the September Foehn case of the period. An inversion layer in the lake area with ozone concentrations below 10 ppb often shields the monitoring stations from the Foehn air aloft. Trajectory calculations for the Foehn period between 19 and 24 October 1999 reveal that the Foehn air originated from below 1 to 1.5 km above the Po Basin and the Mediterranean Sea. Tethered balloon soundings in the source area south of the Alps, ozone measurements at the mountain station Jungfraujoch (3580 m a.s.l.) and airborne measurements across the Alpine crests reveal that the ozone levels found in the Foehn air correspond to the concentrations just above the mixing height in the Po Basin and are transported across the Alpine crest within the lowest flow layer. 相似文献
45.
There are a number of potential biochemcial markers that may have some role in predicting renal function postnatally. These include urinary sodium, calcium and β2‒microglobulin. The latter may also be measured in fetal serum. However, the accuracy of these parameters at a point in time is far from perfect as urinary tract obstruction is a progressive disease which may be best defined by repeated observations throughout pregnancy. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献