Search results for "drain"
showing 10 items of 417 documents
Techniques d’assainissement des sols durant l’Antiquité : Exemples de procédés employés pour lutter contre les eaux d’infiltration en sous-sol à Entr…
2013
National audience; De récentes fouilles exécutées le long de la voie romaine d’Auxerre dans un quartier d’habitats de l’agglomération antique d’Entrains-sur-Nohain / Intaranum (Nièvre) porte un éclairage sur une préoccupation commune aux gallo-romains concernant la lutte contre l’inondation des sous-sols. Face à ces contraintes, divers types de réponses techniques ont été imaginées et mises en œuvre de manière conjointe. Certaines caves de ce quartier sont ainsi équipées de système de drainage des eaux s’évacuant vers un puisard contigu situé sous le portique de rue. Cette solution s’accompagne de dispositifs complémentaires, comme la réalisation de cordon d’étanchéité en argile contre un d…
Nord-Pas-de-Calais, Lille, Pitgam, Crochte, Bissezeele, Socx, Quaëdypre, West-Cappel, Rexpoëde et Oost-Cappel : Gazoduc Artère des Flandres, lot 2 : …
2015
La tranche 2 de ce projet concerne les 23 km de gazoduc qui traverse d’ouest en est 8 communes rurales situées dans la partie septentrionale du département du Nord (Pitgam, Crochte, Bissezeele, Socx, Quaëdypre, West-Cappel, Rexpoëde et Oost-Cappel) afin de rejoindre la station de comptage à Hondschoote.Le tracé du gazoduc, d’ouest en est, s’étend à la limite de la plaine maritime flamande (Flandres maritime) et sur la plaine flamande intérieure (Flandres continentale) dont sa surface apparait ondulée et se compose d’une alternance de vastes plaines et de collines basses argileuses.L’époque protohistorique (Protohistoire ancienne, La Tène moyenne et finale) se caractérise par quatre vestiges…
Meningitis caused by Enterococcus gallinarum after lumbar drainage of cerebrospinal fluid.
2005
We report a rare case of meningitis caused by Enterococcus gallinarum, a bacterium characterized by its ability to express low-level resistance to vancomycin. As in the three other previously reported cases, this one occurred in a patient with a cerebrospinal fluid drainage catheter and properly responded to antimicrobial therapy and removal of the drain.
Dourges : projet d'extension de la plateforme multimodale Delta 3 : rapport de diagnostic
2014
Le diagnostic archéologique réalisé en amont de l'extension de la plateforme Delta 3 a permis de compléter et d'approfondir les connaissances concernant le territoire de Dourges. Les vestiges mis au jour couvrent plusieurs millénaires et concernent les périodes protohistoriques (âge du Bronze et Hallstatt) et historiques (de l'Antiquité jusqu'à l'époque moderne). Pour les périodes protohistoriques, il s'agit d'éléments épars qui ne semblent pas constituer à proprement parler un site. Cependant, des signes ténus d'occupation sont avérés dans ce secteur dés l'âge du Bronze ainsi que durant le premier âge du Fer. L'absence de vestiges de certaines périodes, particulièrement celles du second âg…
Model ecosystem for environmental transport of xenobiotics
1982
A compartmentalized aquatic-terrestrial flow-through model ecosystem was constructed for studying the transport of agricultural chemicals from the soil to the aquatic environment in soil drainage. Factors were investigated on the fate of reference toxicant,14C-DDT, in the subsystems of the model. The behavior of DDT corresponds to its behavior in natural soil/water systems. The soil, acting as a reservoir, retained most of the DDT. The transportation of DDT to the aquatic compartment was negligible, with low availability to the aquatic biota. Because of the dynamic nature of the model, variation was evident between and within model units.
Changes in soil redox potential in response to flood irrigation with waste water in central Mexico
2017
Irrigation with untreated sewage water adds fresh organic matter to the soil. When it is applied by flooding, as in the Mezquital Valley of Mexico, many of the pores in the soil become temporarily waterlogged and depleted of oxygen, and reduction generates nitrous oxide (N2O) and methane (CH4). We monitored the redox potential, Eh, in the soil at two sites in the Mezquital Valley to discover whether the short-term gaseous emissions matched the changes in Eh. One site is irrigated periodically by flooding with waste water and has alfalfa, rye grass and maize grown in succession; the other site grows maize with water from summer rain only. Each electrode buried in the soil for the purpose pro…
Natural organic matter export from boreal catchments (the Salaca River basin, Latvia) and its influencing factors
2012
A noteworthy increase in the organic matter concentration and export, as well as water colour, in the catchments of the Salaca River has been observed during the last decades. This study investigates factors behind this increase: the impact of climate, land use and human loading changes on the concentrations and export of the organic matter in the Salaca River/Lake Burtnieks catchments. Proportion of wetlands in the river basin, type of land use, and runoff regime can be considered as the main factors influencing the organic carbon loadings. Despite a steady overall tendency of increase, considerable oscillations of organic matter loadings influenced by the changes in the river discharge re…
Ecological risk assessment of pesticides in the Mijares River (eastern Spain) impacted by citrus production using wide-scope screening and target qua…
2021
The widespread use of pesticides, especially in agricultural areas, makes necessary to control their presence in surrounding surface waters. The current study was designed to investigate the occurrence and ecological risks of pesticides and their transformation products in a Mediterranean river basin impacted by citrus agricultural production. Nineteen sites were monitored in three campaigns distributed over three different seasons. After a qualitative screening, 24 compounds was selected for subsequent quantitative analysis. As expected, the lower section of the river was most contaminated, with total concentration >5 µg/L in two sites near to the discharge area of wastewater treatment pla…
Benchmark study of undrained triaxial testing of Opalinus Clay shale: Results and implications for robust testing
2021
Triaxial testing of argillaceous rocks and shales is significantly more challenging than conventional rock mechanical testing. The challenges are mainly related to the very low permeability of these geomaterials, and their sensitivity to exposure of atmosphere and brines, which induces variations of water content, suction and effective stress. There are currently no international standards to guide service laboratories for robust testing procedures for shales. A benchmark study of undrained triaxial testing was therefore initiated with three leading service laboratories in shale testing, performing 13 tests and using two different methods of establishing sample saturation prior to deformati…
Impact of biliary stents on the diagnostic accuracy of EUS-guided fine-needle biopsy of solid pancreatic head lesions: A multicenter study
2021
Background and Objectives: There is no clear evidence of a negative impact of biliary stents on the diagnostic yield of EUS-guided fine-needle biopsy (EUS-FNB) for diagnosing pancreatic head lesions. We aimed to evaluate the association between the presence of biliary stents and the diagnostic accuracy of EUS-FNB. Materials and Methods: A multicenter retrospective study including all jaundiced patients secondary to pancreatic head masses was performed. Patients were divided into two groups according to the presence of a biliary stent placed before EUS-FNB. Pathological results were classified according to the Papanicolaou classification and compared against the final diagnosis. Diagnostic m…