Kooperativer Bibliotheksverbund

Berlin Brandenburg

and
and

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Type of Medium
Language
Year
  • 1
    Language: English
    In: Sensors, 01 March 2014, Vol.14(3), pp.4599-4617
    Description: Based on a multi-gas solution-diffusion problem for a dense symmetrical membrane this paper presents a transient theory of a planar, membrane-based sensor cell for measuring gas from both initial conditions: dynamic and thermodynamic equilibrium....
    Keywords: Sensor ; Membrane ; Selectivity ; Gas ; Identification ; Discrimination ; Quantification ; Engineering
    E-ISSN: 1424-8220
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Language: English
    In: International Journal of Greenhouse Gas Control, September 2013, Vol.17, pp.161-169
    Description: Gases from subsurface sources can present risks for the biosphere. To extend the lead time in managing such risks, reliable gas detection in the subsurface is required. A monitoring system was developed that is able to: (i) gather information from large areas, (ii) work efficiently within the subsurface; insensitive to changing subsurface environmental conditions while sensitive to changes in target gas concentrations, and (iii) provide a fast response. We report the first field test of linear membrane-based gas sensors: Fourteen 40 m long sensors were installed in two horizontal nets one above the other within a homogenized soil and scanned from a control station. 10 L/min of CO was injected into a point-like port 25 cm below the lower sensor net. Two operation modes were successfully tested to detect the CO plume: an active mode, which is sensitive to the concentration, and a passive mode, which is sensitive to changes in concentration. By conversion of the monitoring results the minimum contact range of seeping gas and sensor could be determined. Based on this valuable approach, an unexpectedly high level of lateral gas spread within the soil and the formation of a gas pillow below the soil surface could be observed.
    Keywords: Carbon Capture and Storage ; Leakage ; Co2 ; Gas Sensor ; Monitoring ; Subsurface ; Engineering
    ISSN: 1750-5836
    E-ISSN: 1878-0148
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Language: English
    In: Sensors, 01 November 2016, Vol.16(11), p.1930
    Description: Linear membrane-based gas sensors that can be advantageously applied for the measurement of a single gas component in large heterogeneous systems, e.g., for representative determination of CO2 in the subsurface, can be designed depending on the properties of the observation object. A resulting...
    Keywords: Gas Sensors ; Membrane ; Internal Standard ; Monitoring ; Greenhouse Gases ; Co2 ; Engineering
    E-ISSN: 1424-8220
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Language: English
    In: Sensors, 01 December 2012, Vol.12(12), pp.17058-17073
    Description: A conceptually improved sensor network to monitor the partial pressure of CO2 in different soil horizons was designed. Consisting of five membrane-based linear sensors (line-sensors) each with 10 m length, the set-up enables us to integrate...
    Keywords: Gas ; Monitoring ; Soil ; Greenhouse Gases ; Co2 ; Membrane ; Sensor ; Engineering
    ISSN: 1424-8220
    E-ISSN: 1424-8220
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Language: English
    In: Environmental Earth Sciences, 2015, Vol.73(12), pp.8443-8450
    Description: Leakage of wastewater from sewer lines may result in contamination of soil and groundwater. The widespread use of detergents is causing relatively high concentrations of surfactants in wastewater. We studied the effects of surfactants on the infiltration process of wastewater through soil. To that aim, in a laboratory experiment three micro-pore glass filters were installed. A laboratory wastewater substitute was created by adding a commercially available detergent to degassed tap water producing surfactant concentrations of 100, 200 and 400 mg l −1 . Rapid changes in permeability after using the surfactant solution were detected. These were further examined during a process of washing the glass filters with water. The experimental results indicated that changes in permeability were induced by significant adsorption of surfactant molecules on the solids surfaces and thus reducing the size of the pores. Higher levels of permeability changes were detected for higher surfactant concentrations. Additionally, the efficiency of washing process of an adsorbed surfactant molecular layer at the pore surfaces was greater that before the critical micelle concentration.
    Keywords: Exfiltration ; Interface ; Sewer ; Permeability ; Surfactant
    ISSN: 1866-6280
    E-ISSN: 1866-6299
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Language: English
    In: Materials Today: Proceedings, 2017, Vol.4(5), pp.5893-5897
    Description: A 400 m soil test field with gas injection system was built up, which enables an experimental validation of linear membrane-based gas sensors – a sensor technology which was developed based on the selective permeation of gases through membranes. Several soil watering and injection experiments with carbon dioxide at different days with varying boundary conditions were performed showing that the sensor behaves mostly insensitive to the environmental conditions investigated, i.e., barometric pressure fluctuations, soil temperature, air temperature and humidity, sun duration, and wind speed. Furthermore, depending on water infiltration, a gas phase displacement could be observed in-situ based on the changed measurement signal. The results of the validation experiments highlight the potential of the method for rapid leak detection and localization qualifying the sensor particularly for safety applications, e.g., in underground gas storage areas.
    Keywords: Distributed Linear Sensor ; Membrane-Based Gas Sensing ; Subsurface Monitoring ; Gas Storage Areas ; Validation
    ISSN: 2214-7853
    E-ISSN: 2214-7853
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Language: English
    In: Environmental Earth Sciences, 2015, Vol.74(9), pp.6693-6701
    Description: Surfactants are the main active agents in detergents products. Our investigation dealt with the effects of surfactants as a wastewater constituent on the infiltration process of wastewater through saturated soil. In order to more closely observe the flow’s interaction, in a laboratory experiment, a 2D Plexiglas model was filled with fine-grained soil and saturated with degassed water. The particle-free artificial laboratory wastewater was created by adding a commercially available detergent to degassed tap water producing a surfactant concentration with the strength equivalent of up to about 15 times of its critical micelle concentration. The visualization of flow was improved by adding a brilliant blue dye tracer enhancing the color contrast. Photographs were taken from the 2D model using conventional imaging equipment and were processed by image analysis to distinguish the dynamic flow interface between dyed and non-dyed areas. Primarily, the images of vertical flows were analyzed after reducing the contrast range. Next, utilizing an image analysis method, 2D images were reconstructed into 3D visualization models. Three-dimensional and cross-sectional images of the fluid–fluid–soil boundary layer revealed a rapid solute transport prevailing at the dynamic interfaces. This was confirmed with image analysis showing geometric irregularities on the soil surface.
    Keywords: Exfiltration ; Interface ; Sewer ; Dye tracer ; Surfactant
    ISSN: 1866-6280
    E-ISSN: 1866-6299
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Language: English
    In: Materials Today: Proceedings, 2016, Vol.3(4), pp.1074-1078
    Description: Gas sensors in linear form based on the measuring principle of gas selective permeability through a membrane were developed and introduced for the detection and quantification of gas concentrations. A current field study focuses on measuring CO concentrations for a spatially distributed monitoring of subsurface CO gas storage sites in near real time. A 400 m test site and a corresponding laboratory system were built up to characterize, validate, and optimize the sensor. A calibration routine was developed, which can be applied subsequently to underground installation. First measurement results indicate the potential of the method.
    Keywords: Linear Sensor ; Distributed Sensor ; Subsurface Monitoring ; Gas Storage Areas ; Membrane-Based Gas Sensing ; Calibration
    ISSN: 2214-7853
    E-ISSN: 2214-7853
    Source: ScienceDirect Journals (Elsevier)
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Language: English
    In: IEEE Sensors Journal, 01 June 2016, Vol.16(11), pp.4501-4508
    Description: A monitoring method is introduced that creates 2-D maps of the soil gas distribution. The method combines linear gas sensing technology for in situ monitoring of gases in soil with the mapping capabilities of computed tomography to reconstruct spatial and temporal resolved gas distribution maps. A weighted iterative algebraic reconstruction method based on maximum likelihood with expectation maximization in combination with a source-by-source reconstruction approach is introduced that works with a sparse setup of orthogonally aligned linear gas sensors. The reconstruction method successfully reduces artifact production, especially when multiple gas sources are present, allowing the discrimination between true and non-existing the so-called ghost source locations. Experimental validation by controlled field experiments indicates the high potential of the proposed method for rapid gas leak localization and quantification with respect to pipeline or underground gas storage issues.
    Keywords: Gas Detectors ; Soil ; Reconstruction Algorithms ; Computed Tomography ; Monitoring ; Gases ; Computed Tomography ; Gas Distribution Mapping and Gas Source Localization ; Discrimination of Multiple Gas Sources ; Distributed Linear Sensor ; Membrane-Based Gas Sensing ; Subsurface Monitoring ; Gas Storage Areas ; Engineering ; Geography
    ISSN: 1530-437X
    E-ISSN: 1558-1748
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    In: tm - Technisches Messen, 01/28/2016, Vol.83(10)
    Description: A 400 m 2 soil test field with gas injection system was built up for the purpose of large-scale validation, optimization, and characterization of a novel comprehensive monitoring method for underground gas storage areas. The method combines gas sensing technology with linear form factor for in-situ monitoring of gases in soil with the mapping capabilities of Computed Tomography (CT) to reconstruct time-series of gas distribution maps based on samples of orthogonally-aligned linear gas sensors. Several injection experiments with carbon dioxide (CO 2 ) at different days with varying boundary conditions indicates the potential of the method for, e.g., rapid leakage detection with respect to Carbon Capture and Storage (CCS) issues.
    Keywords: Soil Test Field ; Distributed Linear Sensor ; Membrane-Based Gas Sensing ; Subsurface Monitoring ; Gas Storage Areas ; Computed Tomography ; Testfeld ; Verteilte Sensorik ; Membranbasierte Gassensorik ; Monitoring Von Untergrundgasspeichern ; Computertomographie;
    ISSN: 0171-8096
    E-ISSN: 2196-7113
    Source: Walter de Gruyter (via CrossRef)
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages