The Experts below are selected from a list of 34743 Experts worldwide ranked by ideXlab platform
Alfredo C Alder - One of the best experts on this subject based on the ideXlab platform.
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occurrence and enantiomer profiles of β blockers in wastewater and a receiving water body and Adjacent Soil in tianjin china
Science of The Total Environment, 2019Co-Authors: Hongwen Sun, Yanwei Zhang, Alfredo C AlderAbstract:A total of 58 samples were collected from hospitals, municipal wastewater treatment plants (WWTPs), a receiving water body (Dagu Drainage Canal, DDC), and Adjacent farmland in Tianjin City, China, in May and November 2013 and were analyzed for five common β-blockers (atenolol, sotalol, metoprolol, propranolol, and nadolol) to elucidate their source, occurrence and fate in a typical city in China. The profiles of the enantiomers of the β-blockers in some samples were examined. Sotalol, metoprolol and propranolol were frequently detected, atenolol was less frequently detected, and nadolol was mostly not detected. Generally, the concentrations in hospital wastewaters occurred from
Soils Adjacent to the DDC with concentrations up to hundreds of ng/kg in the topSoil and declining levels in the subSoil. Seasonal variation was observed with samples obtained in May showing higher concentrations, both in the canal and the Adjacent Soil, which could be ascribed to greater consumption of these drugs, lower temperature and less precipitation in the spring and the former winter. Enantiomeric fractions (EFs) of metoprolol and propranolol in Soil samples showed a trend of enrichment of E1 (first-eluted) compared to E2 (second-eluted), while sotalol was almost racemic. In the DDC, no significant difference was found for the pair enantiomers of each β-blocker, while in hospital and WWTP wastewaters, E1 predominated. -
Occurrence and enantiomer profiles of β-blockers in wastewater and a receiving water body and Adjacent Soil in Tianjin, China.
Science of The Total Environment, 2018Co-Authors: Hongwen Sun, Yanwei Zhang, Alfredo C AlderAbstract:A total of 58 samples were collected from hospitals, municipal wastewater treatment plants (WWTPs), a receiving water body (Dagu Drainage Canal, DDC), and Adjacent farmland in Tianjin City, China, in May and November 2013 and were analyzed for five common β-blockers (atenolol, sotalol, metoprolol, propranolol, and nadolol) to elucidate their source, occurrence and fate in a typical city in China. The profiles of the enantiomers of the β-blockers in some samples were examined. Sotalol, metoprolol and propranolol were frequently detected, atenolol was less frequently detected, and nadolol was mostly not detected. Generally, the concentrations in hospital wastewaters occurred from
F. Masrouri - One of the best experts on this subject based on the ideXlab platform.
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Pressuremeter test parameters of a compacted illitic Soil under thermal cycling
Acta Geotechnica, 2017Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers in geostructures changes the temperature of the Adjacent Soil, raising important issues concerning the effect of temperature variations on hydro-mechanical Soil behaviour. The objective of this paper is to improve the understanding and quantification of the impact of temperature variation on the bearing capacity of thermo-active piles. Currently, the design of deep foundations is based on the results of in situ penetrometer or pressuremeter tests. However, there are no published data on the effect of temperature on in situ Soil parameters, preventing the specific assessment of the behaviour of thermo-active piles. In this study, an experimental device is developed to perform mini-pressuremeter tests under controlled laboratory conditions. Mini-pressuremeter tests are performed on an illitic Soil in a thermo-regulated metre-scale container subjected to temperatures from 1 to 40 °C. The results reveal a slight decrease in the pressuremeter modulus ( E _p) and a significant decrease in the creep pressure ( p _f) and limit pressure ( p _l) with increasing temperature. The results also reveal the reversibility of this effect during a heating–cooling cycle throughout the investigated temperature range, whereas the effect of a cooling–heating cycle was only partially reversible. In the case of several thermal cycles, the effect of the first cycle on the Soil parameters is decisive.
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Pressuremeter test parameters of a compacted illitic Soil under thermal cycling
Acta Geotechnica, 2017Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers into geostructures leads to changes in the temperature of the Adjacent Soil. Important issues arise about the effect of temperature variations on hydro-mechanical Soil behaviour. The objective of this paper is to improve the understanding and the quantification of the impact of temperature variation on the bearing capacity of thermo-active piles. Currently, the design of the deep foundations is based on the results of in situ penetrometer or pressuremeter tests while there is no published data on the effect of temperature on in situ tests results allowing to specifically assess thermo-active piles behaviour. Herein, an experimental device is developed to carry out mini-pressuremeter tests under controlled laboratory conditions. Mini-pressuremeter tests are performed on an illitic Soil in a thermo-regulated metric scale container subjected to a range of temperature from 1 to 40 °C. The results showed a slight decrease in the pressuremeter modulus (Ep) and a significant decrease in the creep pressure (pf) and the limit pressure (pl) as the temperature 2 increased. The results showed also the reversibility of this effect during a heating-cooling cycle through the investigated temperature range, while the effect of a cooling-heating cycle was only partially reversible. In the case of several thermal cycles, the effect of the first cycle proved to be decisive on the Soil parameters.
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Impact of temperature cyclic variations on bearing capacities of a sensitive Soil
2016Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers in geostructures produces a cyclic variation of the temperature in the Adjacent Soil. Therefore, there are important questions about the effect of temperature variations on hydro-mechanical Soil parameters. In this study, the mini-pressuremeter tests were conducted in laboratory on a homogeneous material submitted to different thermal loading (1 to 40 °C). The tested material, an illitic Soil, is compacted in a thermo-regulated container at optimal water content (31.3 %) and 90% of maximal dry density (1.29 Mg/m 3). Only six tests are performed in each container to prevent edge effects and the influence between the tests. The impact of temperature variation on creep pressure (pf), limit pressure (pl) and pressuremeter modulus (Ep) were determined. A decrease in creep pressure and limit pressure with increasing temperature was observed, while the variation of pressuremeter modulus was less pronounced. The first cycle induced more important parameter variations than the subsequent cycles.
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Impact of Temperature Variations on the Hydro-Mechanical Parameters of a Sensitive Soil
2016Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers in geostructures produces a cyclic variation of the temperature in the Adjacent Soil. Therefore, there are important questions about the effect of temperature variations on hydro-mechanical Soil parameters. In this study, mini-pressuremeter tests were conducted in laboratory on a homogeneous material submitted to different thermal loading (1 to 40 °C). The tested material, an illitic Soil, is compacted in a thermo-regulated container with 0.6 m diameter and 0.8 m height, at optimal water content (31.3 %) and 90% of maximum dry density (1.29 Mg/m 3). Only six tests are performed in each container to prevent edge effects and the influence between the tests. The impact of temperature variation on creep pressure (pf), limit pressure (pl) and pressuremeter modulus (Ep) were determined. A decrease in creep pressure and limit pressure with increasing temperature was observed, while the variation of pressuremeter modulus was less pronounced. The first cycle induced more important parameter variations than the subsequent cycles.
Hongwen Sun - One of the best experts on this subject based on the ideXlab platform.
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occurrence and enantiomer profiles of β blockers in wastewater and a receiving water body and Adjacent Soil in tianjin china
Science of The Total Environment, 2019Co-Authors: Hongwen Sun, Yanwei Zhang, Alfredo C AlderAbstract:A total of 58 samples were collected from hospitals, municipal wastewater treatment plants (WWTPs), a receiving water body (Dagu Drainage Canal, DDC), and Adjacent farmland in Tianjin City, China, in May and November 2013 and were analyzed for five common β-blockers (atenolol, sotalol, metoprolol, propranolol, and nadolol) to elucidate their source, occurrence and fate in a typical city in China. The profiles of the enantiomers of the β-blockers in some samples were examined. Sotalol, metoprolol and propranolol were frequently detected, atenolol was less frequently detected, and nadolol was mostly not detected. Generally, the concentrations in hospital wastewaters occurred from
Soils Adjacent to the DDC with concentrations up to hundreds of ng/kg in the topSoil and declining levels in the subSoil. Seasonal variation was observed with samples obtained in May showing higher concentrations, both in the canal and the Adjacent Soil, which could be ascribed to greater consumption of these drugs, lower temperature and less precipitation in the spring and the former winter. Enantiomeric fractions (EFs) of metoprolol and propranolol in Soil samples showed a trend of enrichment of E1 (first-eluted) compared to E2 (second-eluted), while sotalol was almost racemic. In the DDC, no significant difference was found for the pair enantiomers of each β-blocker, while in hospital and WWTP wastewaters, E1 predominated. -
Occurrence and enantiomer profiles of β-blockers in wastewater and a receiving water body and Adjacent Soil in Tianjin, China.
Science of The Total Environment, 2018Co-Authors: Hongwen Sun, Yanwei Zhang, Alfredo C AlderAbstract:A total of 58 samples were collected from hospitals, municipal wastewater treatment plants (WWTPs), a receiving water body (Dagu Drainage Canal, DDC), and Adjacent farmland in Tianjin City, China, in May and November 2013 and were analyzed for five common β-blockers (atenolol, sotalol, metoprolol, propranolol, and nadolol) to elucidate their source, occurrence and fate in a typical city in China. The profiles of the enantiomers of the β-blockers in some samples were examined. Sotalol, metoprolol and propranolol were frequently detected, atenolol was less frequently detected, and nadolol was mostly not detected. Generally, the concentrations in hospital wastewaters occurred from
H. Eslami - One of the best experts on this subject based on the ideXlab platform.
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Pressuremeter test parameters of a compacted illitic Soil under thermal cycling
Acta Geotechnica, 2017Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers in geostructures changes the temperature of the Adjacent Soil, raising important issues concerning the effect of temperature variations on hydro-mechanical Soil behaviour. The objective of this paper is to improve the understanding and quantification of the impact of temperature variation on the bearing capacity of thermo-active piles. Currently, the design of deep foundations is based on the results of in situ penetrometer or pressuremeter tests. However, there are no published data on the effect of temperature on in situ Soil parameters, preventing the specific assessment of the behaviour of thermo-active piles. In this study, an experimental device is developed to perform mini-pressuremeter tests under controlled laboratory conditions. Mini-pressuremeter tests are performed on an illitic Soil in a thermo-regulated metre-scale container subjected to temperatures from 1 to 40 °C. The results reveal a slight decrease in the pressuremeter modulus ( E _p) and a significant decrease in the creep pressure ( p _f) and limit pressure ( p _l) with increasing temperature. The results also reveal the reversibility of this effect during a heating–cooling cycle throughout the investigated temperature range, whereas the effect of a cooling–heating cycle was only partially reversible. In the case of several thermal cycles, the effect of the first cycle on the Soil parameters is decisive.
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Pressuremeter test parameters of a compacted illitic Soil under thermal cycling
Acta Geotechnica, 2017Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers into geostructures leads to changes in the temperature of the Adjacent Soil. Important issues arise about the effect of temperature variations on hydro-mechanical Soil behaviour. The objective of this paper is to improve the understanding and the quantification of the impact of temperature variation on the bearing capacity of thermo-active piles. Currently, the design of the deep foundations is based on the results of in situ penetrometer or pressuremeter tests while there is no published data on the effect of temperature on in situ tests results allowing to specifically assess thermo-active piles behaviour. Herein, an experimental device is developed to carry out mini-pressuremeter tests under controlled laboratory conditions. Mini-pressuremeter tests are performed on an illitic Soil in a thermo-regulated metric scale container subjected to a range of temperature from 1 to 40 °C. The results showed a slight decrease in the pressuremeter modulus (Ep) and a significant decrease in the creep pressure (pf) and the limit pressure (pl) as the temperature 2 increased. The results showed also the reversibility of this effect during a heating-cooling cycle through the investigated temperature range, while the effect of a cooling-heating cycle was only partially reversible. In the case of several thermal cycles, the effect of the first cycle proved to be decisive on the Soil parameters.
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Impact of temperature cyclic variations on bearing capacities of a sensitive Soil
2016Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers in geostructures produces a cyclic variation of the temperature in the Adjacent Soil. Therefore, there are important questions about the effect of temperature variations on hydro-mechanical Soil parameters. In this study, the mini-pressuremeter tests were conducted in laboratory on a homogeneous material submitted to different thermal loading (1 to 40 °C). The tested material, an illitic Soil, is compacted in a thermo-regulated container at optimal water content (31.3 %) and 90% of maximal dry density (1.29 Mg/m 3). Only six tests are performed in each container to prevent edge effects and the influence between the tests. The impact of temperature variation on creep pressure (pf), limit pressure (pl) and pressuremeter modulus (Ep) were determined. A decrease in creep pressure and limit pressure with increasing temperature was observed, while the variation of pressuremeter modulus was less pronounced. The first cycle induced more important parameter variations than the subsequent cycles.
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Impact of Temperature Variations on the Hydro-Mechanical Parameters of a Sensitive Soil
2016Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:The incorporation of heat exchangers in geostructures produces a cyclic variation of the temperature in the Adjacent Soil. Therefore, there are important questions about the effect of temperature variations on hydro-mechanical Soil parameters. In this study, mini-pressuremeter tests were conducted in laboratory on a homogeneous material submitted to different thermal loading (1 to 40 °C). The tested material, an illitic Soil, is compacted in a thermo-regulated container with 0.6 m diameter and 0.8 m height, at optimal water content (31.3 %) and 90% of maximum dry density (1.29 Mg/m 3). Only six tests are performed in each container to prevent edge effects and the influence between the tests. The impact of temperature variation on creep pressure (pf), limit pressure (pl) and pressuremeter modulus (Ep) were determined. A decrease in creep pressure and limit pressure with increasing temperature was observed, while the variation of pressuremeter modulus was less pronounced. The first cycle induced more important parameter variations than the subsequent cycles.
Tiecheng Zhou - One of the best experts on this subject based on the ideXlab platform.
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a network model for natural ventilation simulation in deep buried underground structures
Building and Environment, 2019Co-Authors: Yimin Xiao, Godfried Augenbroe, Jianli Chen, Tiecheng ZhouAbstract:Abstract The study of underground natural ventilation opportunities has become increasingly significant in recent years with its promise of wide application in underground structures such as underground hydro power stations, metro stations, underground parking and laboratories. It is recognized that deployment of natural ventilation constitutes a passive technology that can lead to significant energy conservation if applied judiciously. This paper focuses on underground buildings that are buried deeply and typically consist of an underground complex network of connected structures. The other characteristic is that these structures house machinery and devices that generate heat, leading to elevated internal air temperatures. Combined with the deep location, it implies that buoyancy forces are significant which make natural ventilation through vertical shaft openings a viable option. These characteristics demand a study of the heat transfer processes between ambient conditions, Soil and underground buildings. In this paper, we present a dynamic flow network model with loops for multizone airflow and apply it to deep buried underground structures considering the dominant heat transfer characteristics, not only through the elements of the network but also the heat exchange with the envelope and Adjacent Soil mass. Finally, a small-scale experiment of occurring airflow is conducted and compared with the outcomes of the dynamic simulation of the proposed model. The comparison serves as validation and illustration of the application potential of the network model for natural ventilation investigation and consecutive optimization of its use in underground buildings.
