Innovative on-site infrasound metrology conducted in 2019 and 2020

2021 ◽  
Author(s):  
stephane denis ◽  
paul vincent ◽  
Rouille Guillaume
Keyword(s):  
Environmental Conditions ◽  
Medium Term ◽  
Good Correspondence ◽  
Preliminary Results ◽  
Innovative System ◽  
Metrology System ◽  
Term Objective

<p>In order to improve the confidence in the results of measurements carried out in the field, on-site metrology is a key step. With the medium-term objective of being able to deploy a portable metrology system on different infrasound stations, CEA-DAM has tested an innovative system for calibrating its infrasound sensors. The first tests were conducted in November 2019 and September 2020 as part of the installation and certification of the IMS IS25 infrasound station in Guadeloupe. A total of 20 microbarometers were qualified on site.<br>We present the equipments deployed, the methods used and the results of the measurements carried out. It appears that the preliminary results show a very good correspondence between the measurements performed in the field, under particular environmental conditions, and the measurements performed in the metrology laboratory. The method will be confronted to the metrology community within the framework of the European Infra-AUV project in 2022.</p>

Measuring Radon and Thoron Levels in Sri Lanka

2013 ◽  
Vol 718-720 ◽  
pp. 721-724
Author(s):  
Deepal Subasinghe Nalaka ◽  
Mahakumara Prasad ◽  
Thusitha B. Nimalsiri ◽  
Nuwan B. Suriyaarchchi ◽  
Takeshi Iimoto ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Environmental Conditions ◽  
In Situ Measurements ◽  
Physical Factors ◽  
Preliminary Results ◽  
Radon Measurements ◽  
First Time

For the first time in Sri Lanka, an attempt was made to measure the outdoor radon levels using CR 39 type passive radon detectors. Preliminary results indicate that in Sri Lanka, 220Rn isotope is more abundance than 222Rn isotope. These results were also confirmed by in-situ measurements. Sri Lanka has one of the highest 220Rn values in the region. It was also noted that environmental conditions and other physical factors have a significant effect on the outdoor radon measurements using passive discriminative detectors.

scholarly journals A METHODOLOGY TO SIMULATE MEDIUM TERM MORPHOLOGICAL CHANGES IN A PRACTICAL COMPUTING TIME

2011 ◽  
Vol 1 (32) ◽  
pp. 58
Author(s):  
Nestor Jimenez ◽  
Roberto Mayerle
Keyword(s):  
Baltic Sea ◽  
Morphological Changes ◽  
Morphological Evolution ◽  
Computing Time ◽  
Empirical Orthogonal Functions ◽  
Medium Term ◽  
Orthogonal Functions ◽  
Preliminary Results ◽  
Realistic Representation ◽  
Set Up

In this paper the assessment of the preliminary results of a methodology to enable predictions of medium-term morphodynamics accounting for the effects of storms is carried out. The methodology integrates the approaches based on a morphological acceleration factor and on the empirical orthogonal functions to account respectively for the morphological changes on the medium and short term. In a very simplified fashion, the effects of the storms are represented by a superposition of most relevant bathymetrical changes. The effectiveness of the methodology was assessed for a coastal stretch along the German Baltic Sea. The analysis of the simulations of morphodynamics for a period of 10 years showed that the method is able to predict volumetric changes along the coastal stretches reasonably well. However it fails to describe the spatial variation of the morphological changes near the coast. Sensitivity studies show also that the results are significantly affected by the set-up scheme of the methodology. Preliminary results during the assessment of the methodology gave clues about the evolution of the morphology of the German Baltic Sea coast. The methodology can be used as a practical tool for initial assessments of tendencies of morphological evolution. Obviously, in this investigation, the method proposed to account for to the storms is a simplified representation of the reality. In this regard, further research is needed to include a more realistic representation of the chronology taking into account their intensity.

Dynamic Response Control of Top-Tension Risers by a Variable Damping and Stiffness System With Magneto-Rheological Damper

2014 ◽  
Author(s):  
Hooi-Siang Kang ◽  
Moo-Hyun Kim ◽  
Shankar S. Bhat Aramanadka ◽  
Heon-Yong Kang
Keyword(s):  
Environmental Conditions ◽  
Structural Integrity ◽  
Dynamic Performance ◽  
Cost Effective ◽  
Variable Stiffness ◽  
Dynamic Responses ◽  
Platform Technology ◽  
Innovative System ◽  
Structural Responses ◽  
Magneto Rheological

The exploration and extraction of offshore hydrocarbon is currently facing stricter requirements in environmental conditions, structural integrity, and dynamic performance. Vibration control may be a critical part of mitigating the excessive dynamic responses of the offshore floating structures. If the structural responses can be monitored and controlled, then smart-platform technology can greatly widen the applicability of current technology toward deeper waters and more severe environmental conditions. This paper is focusing on the numerical simulations and analyses of top-tension risers in a tension-leg platform (TLP), incorporated with a bang-bang controlled magneto-rheological (MR) damper and variable stiffness (VS) system. The specific characteristics of the innovative system in alternating the damping forces and system stiffness show great potential to interactively change the structural behaviors corresponding to various external loadings. This research is expected to provide a robust and cost-effective solution for greatly expanding the capability of future smart offshore-platform technology.

scholarly journals Tara Pacific Expedition’s Atmospheric Measurements of Marine Aerosols across the Atlantic and Pacific Oceans: Overview and Preliminary Results

2020 ◽  
Vol 101 (5) ◽  
pp. E536-E554 ◽  
Author(s):  
J. M. Flores ◽  
G. Bourdin ◽  
O. Altaratz ◽  
M. Trainic ◽  
N. Lang-Yona ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Chemical Properties ◽  
Number Concentration ◽  
Marine Atmosphere ◽  
Marine Aerosol ◽  
Marine Aerosols ◽  
Atmospheric Measurements ◽  
Preliminary Results ◽  
Production Mechanisms

Abstract Marine aerosols play a significant role in the global radiative budget, in clouds’ processes, and in the chemistry of the marine atmosphere. There is a critical need to better understand their production mechanisms, composition, chemical properties, and the contribution of ocean-derived biogenic matter to their mass and number concentration. Here we present an overview of a new dataset of in situ measurements of marine aerosols conducted over the 2.5-yr Tara Pacific Expedition over 110,000 km across the Atlantic and Pacific Oceans. Preliminary results are presented here to describe the new dataset that will be built using this novel set of measurements. It will characterize marine aerosols properties in detail and will open a new window to study the marine aerosol link to the water properties and environmental conditions.

Taphos-m, a Taphonomical Research using Sus scrofa domestica Model in an Experimental Facility

2017 ◽  
Vol 1 (1) ◽  
pp. 33-48
Author(s):  
A. Gutiérrez ◽  
D. Nociarová ◽  
A. Malgosa ◽  
N. Armentano
Keyword(s):  
Environmental Conditions ◽  
Sus Scrofa ◽  
Experimental Archaeology ◽  
Cortical Surface ◽  
Experimental Facility ◽  
Domestic Pig ◽  
Preliminary Results ◽  
Different Types ◽  
Sus Scrofa Domestica

Taphos-m is an experimental archaeology and anthropology project, created in 2011, with the objective of knowing what taphonomic agents and processes could be responsible for the observable effects in the field. The first stage of the project consisted of the burial of 26 domestic pig carcases under different environmental conditions and burial types; the antemortem information about the animals was also compiled. This paper presents the preliminary results obtained during the first three years since the last burial took place. The evolution of the funerary structures was evaluated and four bodies were exhumed. The antemortem data and the information obtained from these four exhumations, have helped in understanding of the cadaveric state of the bodies and the anatomical disassociation of bones buried in different types of funerary structures. The preservation and condition of the cortical surface of the bones and the presence or absence of fragmentation were described too. The results presented here allow an understanding of the evolution of the characteristics of the facility and the differences among the pig remains. Opening all funerary structures is considered necessary in order to obtain further conclusions.

Sign in / Sign up

Export Citation Format

Share Document