نتایج جستجو برای: critical drawdown pressure
تعداد نتایج: 871823 فیلتر نتایج به سال:
Recent years have seen an increase in the use of computer-based numerical models to test stability earth dams and simulate impact all factors that affect their safety. Geo-Studio software its sub-programs SLOPE/W, QUAKE/W are used determine safety dams, investigations dynamic analysis, a finite element serves as base do modeling for this study. The Hemrin Dam represents case study is regarded s...
The objective of this paper was to identify critically ill patients at risk for pressure ulcer (PU) using the Braden scale and digital photographs. A sample of 42 subjects was evaluated for 15 days, between March and June 2009, in Fortaleza, Brazil. A total of 47 lesions were identified, 23 (48.9%) as stage I and 24 (51.1%) as stage II. It is necessary for nurses to become familiar with and ado...
Detecting and quantifying small drawdown at observation wells distant from the pumping well greatly expands the characterized aquifer volume. However, this detection is often obscured by water level fluctuations such as barometric and tidal effects. A reliable analytical approach for distinguishing drawdown from nonpumping water-level fluctuations is presented and tested here. Drawdown is disti...
The Southern Ocean is a key region for global carbon uptake and is characterized by a strong seasonality with the annual CO2 uptake being mediated by biological carbon drawdown in summer. Here we show that the contribution of biology to CO2 uptake will become even more important until 2100. This is the case even if biological production remains unaltered and can be explained by the decreasing b...
Reservoirs often have highly fluctuating water levels. The perimeters of these impoundments, which alternate between being exposed or inundated by water (drawdown zone), are used by nesting birds, but at the risk of nest submergence when water levels rise. For species that nest above the ground in shrubs, foraging and predation may also be affected by flooded habitat. Our objective was to clari...
External noise is introduced by computer-generated random levels of pressure assistance during noisy pressure support ventilation (PSV). In patients, noisy PSV was associated with higher tidal volume variability but not improved cardio-pulmonary function compared with conventional PSV. The potential role of noisy PSV in the management of critically ill patients requiring ventilatory support has...
Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude (approximately 55 degrees S) southwest Pacific sea surface temperatures (SSTs) cooled 6 degrees to 7 degrees C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by appr...
This contribution to the Spot-On volume considers the magnitude and composition of atmospheric nitrogen inputs to the oceans and then goes on to consider the impacts of these inputs. Effects in open ocean and coastal areas are probably different. Offshore atmospheric inputs may produce a small enhancement of overall ocean productivity and hence CO2 drawdown. In coastal waters atmospheric inputs...
Abstract Drawdown/regret times feature prominently in optimal stopping problems, statistics (CUSUM procedure), and mathematical finance (Russian options). Recently it was discovered that a first passage theory with more general drawdown times, which generalize classic ruin may be explicitly developed for spectrally negative Lévy processes [9, 20]. In this paper we further examine the drawdown-r...
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