Search results for "Circulation"

Eco-friendly cavity-containing iron oxides prepared by mild routes as very efficient catalysts for the total oxidation of VOCs

2018

Iron oxides (FeOx) are non-toxic, non-expensive and environmentally friendly compounds, which makes them good candidates for many industrial applications, among them catalysis. In the present article five catalysts based on FeOx were synthesized by mild routes: hydrothermal in subcritical and supercritical conditions (Fe-HT, Few200, Few450) and solvothermal (Fe-ST1 and Fe-ST2). The catalytic activity of these catalysts was studied for the total oxidation of toluene using very demanding conditions with high space velocities and including water and CO2 in the feed. The samples were characterized by X-ray diffraction (XRD), scanning and high-resolution transmission electron microscopy (SEM and…

Bunker Cave stalagmites: an archive for central European Holocene climate variability

2012

Holocene climate was characterised by variability on multi-centennial to multi-decadal time scales. In central Europe, these fluctuations were most pronounced during winter. Here we present a record of past winter climate variability for the last 10.8 ka based on four speleothems from Bunker Cave, western Germany. Due to its central European location, the cave site is particularly well suited to record changes in precipitation and temperature in response to changes in the North Atlantic realm. We present high-resolution records of δ<sup>18</sup>O, δ<sup>13</sup>C values and Mg/Ca ratios. Changes in the Mg/Ca ratio are attributed to past meteoric p…

Decadal oscillations of the aquatic chemistry of river waters in Latvia

2018

Abstract. Water quality changes of surface waters can be used to assess human impact intensity, but of importance is to consider also impacts of climate change/variability and naturally occurring changes of environmental quality. In Latvia, during the recent decades a major reduction of anthropogenic pressure has happened due to restructuring of economy and industrial production, resulting in major decrease of loading of many groups of pollutants. However, trends and driving factors for other groups of substances have not been much studied. Long term (1980–2012) results of hydrochemical monitoring, performed in rivers of Latvia, are analysed during this study in connection with long-term se…

Risk of Periodontal Disease: Is there a Correlation with the Type of Antihypertensive Medication?

2011

Introduction: The purpose of this study was to evaluate the effects of long-term oral antihypertensive treatment using centrally acting sympatho-inhibitory drugs (clonidine) and beta-blockers (metoprolol) on capillary microcirculation in the labial and periodontal mucosa.
 Methods: Sixty subjects were recruited for the study: 20 patients affected by hypertension in treatment with centrally-acting sympatho-inhibitory drugs (64.28 ± 11.78 years); 20 patients in treatment with beta-blockers (62.03 ± 9.84 years) and 20 healthy subjects (62.06 ± 6.72 years). We use the videocapillaroscopic technique to evaluate in vivo the microcirculation of the labial mucosa corresponding to the lower lip…

Development of temperature and oxygen gradients during the formation of ice cover in a deep boreal lake

2008

Cross-sectional flow and velocity redistribution in a meandering laboratory flume

2015

The role played by the cross-stream circulation could be important in the longitudinal flow velocity and bed shear stress redistributions, which determine the bed topography (Blanckaert et al., 2008). Recent experimental results obtained in a strongly curved channel (Blanckaert and Graf, 2001) and in a large amplitude meandering flume (Termini and Piraino, 2011) have highlighted that, besides the main central-region cell, a counter-rotating secondary circulation cell forms near the outer bank along the curved reaches of the channel. In this context, the present work aims at improving the understanding of the flow characteristics along a meandering bend. The analysis is based on detailed vel…

We Had to Feed the People: The Italian Lira and the Political Economy of Currency in British Eritrea, 1941–1950

2021

Following the occupation of Eritrea in 1941, British authorities in London promoted a currency policy aimed at replacing the Italian lira with a sterling-based currency basket. In May 1942, they opted for the enforcement of the East African shilling as the new legal tender. The lire, however, did not disappear overnight. Their circulation was tolerated—and, in some cases, even encouraged—by British authorities in Asmara, which exploited the small deal of autonomy they enjoyed from London to adapt the new monetary system to the needs of local governance. The case study is a useful lens to analyse the multiplicity of interests that shaped the political economy of currency of the United Kingdo…

ESRA19-0692 Which preoperative tests before regional anaesthetic procedures?

2019

As we know, any regional anaesthesia technique stays under failure risks. What anaesthetists have to know about the regional block before let the surgeons start after regional anaesthesia? There are few positions which should be confirmed by tests. Firstly, detect the onset of successful sensitive, motor and sympathetic block. Secondly, confirm the correct area of the regional block. Furthermore, the anaesthetist should understand if the regional block performed under deep sedation or general anaesthesia will be effective also after the surgery. What we have to remember and what we need to check for this reason? Pain is subjective phenomenon. Are we determined as dependent on the patient‘s …

Global Chronic Total Occlusion Crossing Algorithm

2021

© 2021 The Authors. Published by Elsevier on behalf of the American College of Cardiology Foundation. This is an open access article under the CC By-NC-ND License (http://creativecommons.org/licenses/by-nc-nd/4)

Comparison of the quantitative first pass myocardial perfusion MRI with and without prospective slice tracking: Comparison between breath-hold and fr…

2010

Physiologic motion of the heart is one of the major problems of myocardial blood flow quantification using first pass perfusion-MRI method. To overcome these problems, a perfusion pulse sequence with prospective slice tracking was developed. Cardiac motion was monitored by a navigator directly positioned at heart's basis to overcome no additional underlying model calculations connecting diaphragm and cardiac motion. Additional prescans were used before the perfusion measurement to detect slice displacements caused by remaining cardiac motion between navigator and the perfusion slice readout. The pulse sequence and subsequent quantification of myocardial blood flow was tested in healthy pigs…