102,115 research outputs found
Marriage record of Gikas, John and Wechter, Mary
No full textMarriage license for John Gikas and Mary Wechter. G. Coutouzis was the officiant
BTEX removal in pilot scale constructed wetlands
No full textDull scale experience of constructed wetlands treating wastewater with BTE
BTEX removal in pilot scale horizontal subsurface flow constructed wetlands
No full textBTEX (Benzene, Toluene, Ethylbenzene and Xylenes) are commonly encountered pollutants. The
focus of this present work is onthe removal of BTEX using pilot scale constructed wetlands (CWs).
Experiment carried out in three similar pilot scale horizontal sub-surface flow constructed wetlands
(HSFCWs) with area of 35 m2 (each), two of which were planted with different macrophytes
(Phragmites australis and Typha latifolia), while an unplanted one was used as control. A number
of hydraulic tests were carried out using lithium bromide as tracer, to assess the hydraulic residence
time. Residence time distributions (RTDs) for the two CWs indicated that the Typha field was
characterized by a void volume fraction (porosity) of 0.16 and exhibited more ideal plug flow
behavior (Pe=29.7) compared with the Phragmites field (Pe = 26.7), which had similar porosity.
The measured hydraulic residence times in the planted fields were 35.8, 36.7, and 34.1 h, for Typha,
Phragmites and unplanted respectively, at wastewater flow rates equal to 1 m3/d. The observed
percentage removal for BTEX ranged between 46 to 55 %. The average removal in the Phragmites
field was5%,higher, than the Typha field and 23%, higher than the unplanted field. BTEX removal
was primarily attributed to volatilization, however biodegradation played also a significant role
Removal of iron, chromium and lead from waste water by horizontal subsurface flow constructed wetlands
No full textTwo pilot scale horizontal subsurface flow constructed wetlands (HSFCWs), with a planted area of 15 m2 each, were constructed in Puglia, Italy, and planted with hydrophytes (Phragmites australis and Typha latifolia), while a similar field of equal size was used as a control. The primary aim of the present work was to assess the removal of three heavy metals from waste‐water, in relation to the evapotranspiration, using HSFCWs
BTEX removal in pilot scale horizontal subsurface flow constructed wetlands
No full textBTEX (Benzene, Toluene, Ethylbenzene and Xylenes) are commonly encountered pollutants. The
focus of this present work is onthe removal of BTEX using pilot scale constructed wetlands (CWs).
Experiment carried out in three similar pilot scale horizontal sub-surface flow constructed wetlands
(HSFCWs) with area of 35 m2 (each), two of which were planted with different macrophytes
(Phragmites australis and Typha latifolia), while an unplanted one was used as control. A number
of hydraulic tests were carried out using lithium bromide as tracer, to assess the hydraulic residence
time. Residence time distributions (RTDs) for the two CWs indicated that the Typha field was
characterized by a void volume fraction (porosity) of 0.16 and exhibited more ideal plug flow
behavior (Pe=29.7) compared with the Phragmites field (Pe = 26.7), which had similar porosity.
The measured hydraulic residence times in the planted fields were 35.8, 36.7, and 34.1 h, for Typha,
Phragmites and unplanted respectively, at wastewater flow rates equal to 1 m3/d. The observed
percentage removal for BTEX ranged between 46 to 55 %. The average removal in the Phragmites
field was5%,higher, than the Typha field and 23%, higher than the unplanted field. BTEX removal
was primarily attributed to volatilization, however biodegradation played also a significant role
Removal of iron, chromium and lead from waste water by horizontal subsurface flow constructed wetlands
No full textTwo pilot scale horizontal subsurface flow constructed wetlands (HSFCWs), with a planted area of 15 m2 each, were constructed in Puglia, Italy, and planted with hydrophytes (Phragmites australis and Typha latifolia), while a similar field of equal size was used as a control. The primary aim of the present work was to assess the removal of three heavy metals from waste‐water, in relation to the evapotranspiration, using HSFCWs
Measuring the dynamic displacements of bridges using geophone data: Application and validation on a lively footbridge
No full textDynamic displacement is a highly valuable information for the evaluation of bridge safety and performance, providing data on the dynamic behaviour of the structure under service loads. However, its measure is often challenging and costly: traditional techniques require a fixed support and a direct connection (or a clear line-of-sight) with the target point that is rarely present in large-scale infrastructures, making their deployment in long-term monitoring often not feasible. In this study, an indirect measuring approach deploying an electro-dynamic velocity sensor (geophone) and digital filtering is adopted to measure human-induced dynamic displacements on a lively footbridge. These sensors have an excellent cost to performance ratio, do not require any powering and, overall, are easy to install and deploy for a long time. Furthermore, geophones measure velocities and consequently only “one integration step” is needed to obtain displacements. The field test was performed with the bridge partially open to pedestrian passages, the geophone was placed in different positions directly on the deck, and a reference measure of the vertical displacement was obtained from a laser-based system placed nearby. Appropriate digital filtering is then applied on the geophone data before the integration. The calibration of digital filters and the validation of the results was carried out comparing the reconstructed vertical displacements from geophone data and the directly measured vertical displacements from the state-of-art measuring device. Under the assumption of pure dynamic loading, some promising results were obtained, reaching a tenth of a millimetre accuracy for the integrated signals
Steel bridge structural damage detection using Ground-Based Radar Interferometry vibration measurements and deep learning Convolutional Neural Networks
No full text[EN] This paper introduces a new, data-driven, vibration-based, damage detection strategy realized on an on-purpose built, Bailey type, steel bridge model (6.12 m x 1.80 m, scale 1:2.5) as part of the research work undertaken in the School of Rural, Surveying and Geoinformatics Engineering, NTUA, Greece. Vibrations of the bridge model in a “healthy” and damaged condition were recorded using a Ground-Based Radar Interferometer (GBRI). Structural damage was deliberately induced on the bridge model by removing a number of carefully selected structural parts, whilst bridge excitation was achieved using a vibration generation apparatus. This system employs an in-house built in trolley system capable of realizing preset dynamic load scenarios. The damage detection approach developed relies on the transformation of GBRI vibration measurements to Continuous Wavelet Transform (CWT) scalogram images. The latter are then used to apply alternate pattern recognition techniques; particularly, a class of pre-trained Deep Learning Convolutional Neural Networks (CNNs) through the application of Transfer Learning technique. The classification results of the bridge health status reach an accuracy of the order of 90%, suggesting the effectiveness and the high potential of the proposed approach.Piniotis, G.; Gikas, V. (2023). Steel bridge structural damage detection using Ground-Based Radar Interferometry vibration measurements and deep learning Convolutional Neural Networks. En 5th Joint International Symposium on Deformation Monitoring (JISDM 2022). Editorial Universitat Politècnica de València. https://riunet.upv.es/handle/10251/192267OC
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
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