Development of More Cost-Effective Methods for Long-Term Monitoring of Soil Vapor Intrusion to Indoor Air Using Quantitative Passive Diffusive-Adsorptive Sampling

2014 ◽  
Author(s):  
Todd McAlary
Keyword(s):  
Indoor Air ◽  
Cost Effective ◽  
Vapor Intrusion ◽  
Long Term Monitoring ◽  
Term Monitoring ◽  
Soil Vapor Intrusion

Development and Assembly of a MEMS Based High-Sensitivity Relative Gravimeter for Multi-Pixel Imaging Applications 

2021 ◽  
Author(s):  
Karl Toland ◽  
Abhinav Prasad ◽  
Andreas Noack ◽  
Kristian Anastasiou ◽  
Richard Middlemiss ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Cost Effective ◽  
Mount Etna ◽  
Earth Tides ◽  
Gravity Measurements ◽  
Stepper Motors ◽  
Long Term Monitoring ◽  
The Stability ◽  
Term Monitoring

<p>The manufacture and production of a high-sensitivity cost-effective gravimeter has the potential to change the methodology and efficiency of gravity measurements. Currently, the most common method to conduct a survey is by using a single gravimeter, usually costing tens of thousands of Dollars, with measurements taken at multiple locations to obtain the required data. The availability of a cost-effective gravimeter however would allow the user to install multiple gravimeters, at the same cost of a single gravimeter, to increase the efficiency of surveys and long-term monitoring.  </p><p> </p><p>Since the previous reporting on a low-drift relative MEMS gravimeter for multi-pixel imaging applications (Prasad, A. et al, EGU2020-18528), significant progress has been made in the development and assembly of the previously reported system. Field prototypes have been manufactured and undergone significant testing to investigate the stability and robustness of the system in preparation for the deployment of multiple devices as part of the gravity imager on Mount Etna. The device, known as Wee-g, has several key features which makes it an attractive prospect in the field of gravimetry. Examples of these features are that the Wee-g is small and portable with the ability to connect to the device remotely, can be powered through a mains connected power supply, or through portable batteries, weighs under 4kg, has a low power consumption during normal use of 5W, correct for tilt through manual adjustments or remotely through integrated stepper motors with a total tilt correction range of 5 degrees, the ability to read out tilt of the device through an inclinometer for either alignment or long term monitoring and numerous temperature sensors and heater servos to control the temperature of the MEMS to <1mK.</p><p> </p><p>This presentation aims to report on the progress that has been achieved in the development and manufacturing of the prototype devices, various testing of the devices under various laboratory conditions (such as the measurements of the Earth tides, and a relative measurement of gravity at various floor levels), as well as additional applications that are to be explored in 2021. </p>

scholarly journals Cost-effective autonomous sensor for the long-term monitoring of water electrical conductivity of crop fields

2019 ◽  
Vol 165 ◽  
pp. 104940 ◽  
Author(s):  
Ernesto Serrano-Finetti ◽  
Carles Aliau-Bonet ◽  
Oscar López-Lapeña ◽  
Ramon Pallàs-Areny
Keyword(s):  
Electrical Conductivity ◽  
Cost Effective ◽  
Crop Fields ◽  
Autonomous Sensor ◽  
Long Term Monitoring ◽  
Term Monitoring

scholarly journals A Cost-Effective Trace Gas Measurement Program for Long-Term Monitoring of the Stratospheric Circulation

2014 ◽  
Vol 95 (1) ◽  
pp. 147-155 ◽  
Author(s):  
Fred L. Moore ◽  
Eric A. Ray ◽  
Karen H. Rosenlof ◽  
James W. Elkins ◽  
Pieter Tans ◽  
...  
Keyword(s):  
Cost Effective ◽  
Trace Gas ◽  
Gas Measurement ◽  
Stratospheric Circulation ◽  
Long Term Monitoring ◽  
Term Monitoring

scholarly journals A Novel Method for Sampling and Long-Term Monitoring of Microbes That Uses Stickers of Plain Paper

2019 ◽  
Vol 85 (14) ◽  
Author(s):  
Martin Bobal ◽  
Anna Kristina Witte ◽  
Patrick Mester ◽  
Susanne Fister ◽  
Dagmar Schoder ◽  
...  
Keyword(s):  
Listeria Monocytogenes ◽  
Quantitative Pcr ◽  
Food Production ◽  
Cost Effective ◽  
Sampling System ◽  
Content Type ◽  
Long Term Monitoring ◽  
Production Areas ◽  
Term Monitoring

ABSTRACT Detection of pathogens is crucial in food production areas. While it is well established, swabbing as a state-of-the-art sampling method offers several drawbacks with respect to yield, standardization, overall handling, and long-term monitoring. This led us to develop and evaluate a method that is easier to use at a lower cost and that should be at least as sensitive. After evaluating sundry promising materials, we tested text-marking paper stickers for their suitability to take up and release Listeria monocytogenes with their nonsticky paper side over a 14-day time period using quantitative PCR. The recovery rate was similar to that in previous studies using conventional swabs, and we also confirmed the feasibility of pooling besides resilience to cleansing and disinfection. In a proof-of-concept experiment that sampled several locations, such as door handles, the occurrences of L. monocytogenes and Escherichia coli were determined. The results suggest that the presented sticker system might offer a promising cost-effective alternative sampling system with improved handling characteristics. IMPORTANCE As a ubiquitous bacterium, Listeria monocytogenes has a propensity to enter food production areas inadvertently via fomites such as door handles and switches. While the bacterium might not be in direct contact with the food products, knowing the microbial status of the surroundings is essential for risk assessment. Our investigation into a novel quantitative PCR (qPCR)-based sampling system with the highest sensitivity and ability to monitor over long periods of time, yet based on paper, proved to be cost-effective and reasonably convenient to handle.

Indoor air quality and occupants' ventilation habits in China: Seasonal measurement and long-term monitoring

2018 ◽  
Vol 142 ◽  
pp. 119-129 ◽  
Author(s):  
Junjie Liu ◽  
Xilei Dai ◽  
Xiangdong Li ◽  
Susu Jia ◽  
Jingjing Pei ◽  
...  
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Long Term Monitoring ◽  
Term Monitoring

Development of a cost effective probe for the long term monitoring of straw bale buildings

2011 ◽  
Vol 46 (1) ◽  
pp. 156-164 ◽  
Author(s):  
Jim Carfrae ◽  
Pieter De Wilde ◽  
John Littlewood ◽  
Steve Goodhew ◽  
Peter Walker
Keyword(s):  
Cost Effective ◽  
Long Term Monitoring ◽  
Straw Bale ◽  
Term Monitoring
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