scholarly journals An underwater sensing system for monitoring radioactivity in the marine environment

2004 ◽  
Vol 5 (1) ◽  
pp. 125 ◽  
Author(s):  
C. TSABARIS ◽  
I. THANOS
Keyword(s):  
Marine Environment ◽  
Background Radiation ◽  
Energy Calibration ◽  
Water Tank ◽  
Sensing System ◽  
Set Up ◽  
The Stability ◽  
Term Monitoring ◽  
Time Acquisition

We describe a set up and an application for an autonomously working, radioactivity sensing instrument, usable in seawater and river environments. The system is based on a N aI scintillator with the appropriate specifications for use in the marine environment and for real time acquisition. It is simple, stable for long - term monitoring, and of low consumption. Many tests were carried out for the linearity and the stability of the electronics. The investigation of energy resolution and energy calibration of the sensor was performed in the laboratory using various reference point radioactive sources. The system was also deployed in a water tank in order to measure background radiation in the water and low volumetric activity of 137Cs (17 Bq/m3). Appropriate software identifies qualitatively the low level137Cs contribution to the measured γ-ray spectrum.

scholarly journals Set up and application of an underwater Α-ray spectrometer for radioactivity measurements

2005 ◽  
Vol 6 (1) ◽  
pp. 35 ◽  
Author(s):  
C. TSABARIS ◽  
S. VLACHOS ◽  
C.T. PAPADOPOULOS ◽  
R. VLASTOU ◽  
C.A. KALFAS
Keyword(s):  
Marine Environment ◽  
Detection System ◽  
On Line ◽  
Parallel Measurement ◽  
Set Up ◽  
And Control ◽  
Potassium 40 ◽  
Radioactivity Measurements ◽  
Term Monitoring

The set up and control of an underwater measuring instrument for radioactivity pollution in the marine environment is described. The detection system is based on a NaI scintillator (RADAM III) with modifications for use in the marine environment with on-line measurements. The system is simple, has low power consumption and is stable for long-term monitoring (10 months). Before its deployment, the sensor was calibrated in the laboratory in a tank full of water to reproduce the marine environment. The calibrations were performed, by detecting the 661keV and 1461 keV gamma rays of known activity liquid sources 137 Cs and 40 K, respectively. The measured spectra in the laboratory were compared with spectra from a similar detector as acquired in the field. The analysis of the parallel measurement gave satisfactory agreement for the concentration of the potassium (40 K), as calculated from the salinity in the seawater, thus enabling the system for quantitative measurement of the seawater radioactivity.

scholarly journals Long-term monitoring programme of the hydrological variability in the Mediterranean Sea: a first overview of the HYDROCHANGES network

Ocean Science ◽  
2013 ◽  
Vol 9 (2) ◽  
pp. 301-324 ◽  
Author(s):  
K. Schroeder ◽  
C. Millot ◽  
L. Bengara ◽  
S. Ben Ismail ◽  
M. Bensi ◽  
...  
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Sampling Interval ◽  
Global Changes ◽  
Hydrological Variability ◽  
Long Term Monitoring ◽  
The Mediterranean ◽  
Set Up ◽  
Term Monitoring

Abstract. The long-term monitoring of basic hydrological parameters (temperature and salinity), collected as time series with adequate temporal resolution (i.e. with a sampling interval allowing the resolution of all important timescales) in key places of the Mediterranean Sea (straits and channels, zones of dense water formation, deep parts of the basins), constitute a priority in the context of global changes. This led CIESM (The Mediterranean Science Commission) to support, since 2002, the HYDROCHANGES programme (http//www.ciesm.org/marine/programs/hydrochanges.htm), a network of autonomous conductivity, temperature, and depth (CTD) sensors, deployed on mainly short and easily manageable subsurface moorings, within the core of a certain water mass. The HYDROCHANGES strategy is twofold and develops on different scales. To get information about long-term changes of hydrological characteristics, long time series are needed. But before these series are long enough they allow the detection of links between them at shorter timescales that may provide extremely valuable information about the functioning of the Mediterranean Sea. The aim of this paper is to present the history of the programme and the current set-up of the network (monitored sites, involved groups) as well as to provide for the first time an overview of all the time series collected under the HYDROCHANGES umbrella, discussing the results obtained thanks to the programme.

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 Marine monitoring along the eastern coastal area of the Island of Lesvos, Greece during 2004 in the Framework of MEDPOL III

2013 ◽  
Vol 9 (2) ◽  
pp. 83-97
Keyword(s):  
Marine Environment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phase Iii ◽  
Eastern Coast ◽  
Marine Monitoring ◽  
The City ◽  
Term Monitoring

The present survey was carried out in the framework of MEDPOL Phase III (2004 – 2006), aiming to provide recent information for the long-term monitoring of pollution trends in selected susceptible marine environments along the Mediterranean coastline. Information was collected from a network of four stations spaced out along the eastern coast of the Island of Lesvos, Greece, including a high risk station near the harbour of the city of Mytilini. Pollutants in abiotic components of the marine environment (seawater, sediment) as well as in selected marine organisms (M. barbatus and B. boops) were measured. It was found that there is no evidence of substantial pollution of the marine environment (seawater, sediment and fish) with respect to the pollutants measured. However, it was shown that although the uncontrolled discharge of untreated effluents has been reduced since the beginning of the operation of the Mytilini sewage treatment plant in 2001, sediments near the harbour of the city still carry increased loads of metals of anthropogenic origin. Furthermore, the small quantity of untreated sewerage that still flows out in the harbour of the city seems to affect water quality, since a higher mesotrophic character with eutrophic trends was observed in the area.

scholarly journals Street View Imaging for Automated Assessments of Urban Infrastructure and Services

2021 ◽  
pp. 29-40
Author(s):  
Daniel Zünd ◽  
Luís M. A. Bettencourt
Keyword(s):  
Traffic Management ◽  
Urban Environments ◽  
City Governments ◽  
Development Goals ◽  
General Basis ◽  
Ambient Data ◽  
Systemic Development ◽  
Set Up ◽  
Term Monitoring

AbstractMany forms of ambient data in cities are starting to become available that allows tracking of short-term urban operations, such as traffic management, trash collections, inspections, or non-emergency maintenance requests. However, arguably the greatest promise of urban analytics is to set up measurable objectives and track progress toward systemic development goals connected to human development and sustainability over the longer term. The challenge for such an approach is the connection between new technological capabilities, such as sensing and machine learning and local knowledge, and operations of residents and city governments. Here, we describe an emerging project for the long-term monitoring of sustainable development in fast-growing towns in the Galapagos Islands through the convergence of these methods. We demonstrate how collaborative mapping and the capture of 360-degree street views can produce a general basis for a broad set of quantitative analytics, when such actions are coupled to mapping and deep-learning characterizations of urban environments. We map and assess the precision of urban assets via automatic object classification and characterize their abundance and spatial heterogeneity. We also discuss how these methods, as they continue to improve, can provide the means to perform an ambient census of urban assets (buildings, vehicles, services) and environmental conditions.

scholarly journals Effective Ecological Monitoring

2010 ◽  
Vol 16 (3) ◽  
pp. 224
Author(s):  
Joanne M. Hoare
Keyword(s):  
Case Studies ◽  
Ecological Monitoring ◽  
New Paradigm ◽  
Passive Monitoring ◽  
Adaptive Monitoring ◽  
Long Term Monitoring ◽  
Set Up ◽  
Term Monitoring

In their book Effective Ecological Monitoring, David Lindenmayer and Gene Likens set out to demonstrate the importance of long-term ecological monitoring programmes, as well as presenting what they propose to be a new paradigm, ?adaptive monitoring?. In a brief introduction, they set up a framework for discussing ecological monitoring by arguing that monitoring can be categorized into one of three main types, curiosity-driven (passive) monitoring, mandated monitoring or question-driven monitoring, the latter of which they strongly suggest has the most merit. The book is then structured around three main chapters, ?Why monitoring fails?, ?What makes long-term monitoring effective?? and ?The problematic, the effective and the ugly ? some case studies?, and rounded off with a concluding chapter.

scholarly journals Application of the terrestrial laser scanner in the monitoring of earth structures

2020 ◽  
Vol 12 (1) ◽  
pp. 503-517
Author(s):  
Janusz P. Kogut ◽  
Elżbieta Pilecka
Keyword(s):  
Laser Scanning ◽  
Numerical Models ◽  
Laser Scanner ◽  
The Finite Element Method ◽  
Earth Structures ◽  
Multiple Measurements ◽  
The Stability ◽  
Term Monitoring ◽  
Ground Material

AbstractTerrestrial laser scanning (TLS) assists in the detection of the unsafe behaviour of slopes and scarps. It also facilitates the assessment of the stability of earthworks. Earth structures are those that are usually made of qualified ground material. One may distinguish between point structures such as mounds, forts and dams, and linear structures such as roads, railways and flood embankments. This article concerns the problem of monitoring and analysing of the effects associated with the unstable behaviour of selected earth structures. TLS enables remote sensing of surface changes in a simple and automated manner. Regular, multiple measurements with the laser scanner are applied in long-term monitoring of the behaviour of the selected objects. The discrete numerical models using, for example, the finite element method (FEM) take into account geotechnical properties of substrate and allow for the risk assessment and stability testing of such structures. The numerical model of the structure along with the parameters of the substrate are introduced into the FEM package. This allows for the analysis of stresses, strains and displacements, along with different loading cases. The work here presents a few selected earth structures for which the aforementioned analyses have been undertaken.

scholarly journals Developing a strategic plan for sustainable health inequality monitoring – the basic step towards tackling health inequalities in long run

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
T Lesnik
Keyword(s):  
Health Inequalities ◽  
Health Inequality ◽  
Strategic Plan ◽  
Basic Step ◽  
Long Run ◽  
The Status ◽  
Long Term Monitoring ◽  
Set Up ◽  
Term Monitoring

Abstract Slovenia has had periodic reporting on health inequalities for almost a decade. The importance of reporting is well recognised and stated in the National strategy on health care 2015-2025. Yet, the assessment of the status of the national health inequality monitoring system (HIMS) conducted within the Joint Action Health Equity Europe project, made the unsystematic nature of current practices obvious. A need for developing a more systematic and sustainable HIMS and to have a long-term monitoring strategic plan in place was acknowledged. The set-up of systematic and sustainable long-term monitoring of health inequalities will provide reliable and comparable longitudinal data on the direction, magnitude and trend of health inequalities in Slovenia. This is in turn necessary to inform any future policies and/or programmes, thus stimulating action. Furthermore, identifying relevant stakeholders will facilitate formation of a network of partners who take part in tackling health inequalities, thus allowing for a more proactive (i.e. bridging) role in addressing health inequalities in Slovenia. The aim of this presentation is to demonstrate the process and the steps taken to prepare a document (strategic plan) detailing a systematic approach to long-term monitoring of health inequalities complete with goals, objectives, methodology, a pragmatic set of indicators and an evaluation plan that will inform and facilitate most reporting/monitoring activities

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