atmospheric monitoring Articles
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Dissolved oxygen’s effect on ecosystems
Dissolved oxygen (DO) is a measure of the amount of oxygen dissolved in water. It can be caused by a process of aeration of water flowing through rapids or falls, a byproduct of photosynthesis and the atmosphere. Monitoring DO levels in water may be more important than you think. From dead fish washing up on the shores of Singapore, to historically low levels of brown shrimp, DO is having an ...
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High-Purity DNPH Standards for Monitoring of Atmospheric Carbonyls
Analysts monitoring for atmospheric carbonyls follow prescribed methods published by the US Environmental Protection Agency, the California Air Resource Board, and the American Society for Testing and Materials (ASTM®). These methods call for trapping carbonyls on an adsorbent coated with dinitrophenylhydrazine (DNPH). Sigma Aldrich offers more than fifty 2,4-DNPH carbonyl derivative ...
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Modified Atmosphere Gas Mixers from Environics
Global transit capacities enable the rapid transport of perishable goods and produce across the world, meaning that consumers can enjoy products many miles from their country of origin. This is a complicated process and storage conditions must be continuously monitored. Modified atmosphere gas mixers are integral for this process of ...
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Potential use of Syntrichia ruralis for monitoring atmospheric BTEX
Many studies deal with the bioaccumulation of metals in mosses. In contrast, the knowledge about organic pollutants is less extensive and there is a relative lack of studies using plants for the biomonitoring of volatile organic compounds such as Benzene, Toluene, Ethylbenzene and Xylenes (BTEX). Both in situ and in controlled conditions, this study deals with the capacity of mosses to accumulate ...
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Assessing atmospheric concentration of polychlorinated biphenyls (PCBs) by evergreen Rhododendron maximum next to a contaminated stream
Conifers are often used as an “air passive sampler”, but few studies have focused on the implication of broadleaf evergreens to monitor atmospheric semivolatile organic compounds such as polychlorinated biphenyls (PCBs). In this study, we used Rhododendron maximum (rhododendron) growing next to a contaminated stream to assess atmospheric PCB concentrations. The study area was located in a ...
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Water Vapor Interference in the UV Absorption Measurement of Atmospheric Ozone
In this thesis work, a significant and sometimes large water vapor interference inherent to many and possibly all UV-based, commercially available ozone monitors was positively identified for the first time. Depending upon the instrument's recent atmospheric history and calibration method, zone monitors can give erroneous results both immediately and hours later, and as a consequence possibly ...
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Effective use of radiation monitoring data and dispersion calculations in an emergency
An essential prerequisite for the proper management of a radiation emergency is that measurement data and calculation prognoses are available and that they are produced in an efficient manner. This paper reviews some of the factors contributing to the practice of performing radiation measurements and atmospheric-dispersion-model calculations effectively and discusses the issues related to the ...
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Monitoring Airborne Contaminants in Workplace Atmospheres, Using Sampling Devices and GC or HPLC
Workers' exposure to hazardous substances must be held within acceptable limits. Therefore, airborne contaminant vapor and particles (including aerosols) in industrial atmospheres must be monitored. In the United States, the National Institute for Occupational Safety and Health (NIOSH) and the Occupational Safety and Health Administration (OSHA) offer, for many such substances, specific ...
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Effects of cloud microphysical parameters on the global energy budget
Cloud microphysical parameters, such as cloud droplet size (r), droplet number concentration (Nd) and liquid water content (LWC), play an important role in the energy budgets of clouds, and thus the climate of the earth's atmosphere. The observations were collected during the North Atlantic Regional Experiment (NARE) near Yarmouth, Nova Scotia between 5 August and 8 September 1993. Measurements ...
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ARTeMIS software from SVS in the SOFIA project, USA / Germany - Case Study
ARTeMIS software from SVS in the SOFIA project SOFIA, the Stratospheric Observatory For Infrared Astronomy (SOFIA) is a flying infrared observatory. With this unique platform, scientists will be able to investigate for example the development of young stars and planetary systems or to examine the centre of our home galaxy, the Milky ...
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Field tracer experiments over nuclear sites for the validation of a Korean real-time atmospheric dispersion and dose assessment system (FADAS)
A real-time atmospheric dispersion and dose assessment system (FADAS) has been developed. It has been used as a basic tool to monitor the atmospheric dispersion of released radioactive materials and radiological dose assessment to the national emergency preparedness system, CARE, since 1995. Tracer experiments have been conducted for the purpose of validating FADAS and analysing the environmental ...
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Effect of averaging time on mean concentrations in building influenced dispersion
Tracer gas was released upwind of a cubical model building in the field, under neutral atmospheric conditions, in order to investigate the dependence of mean wake concentrations on averaging time. Two different experimental settings were examined, with the obstacle isolated or embedded within an array of similar obstacles. The averaging periods examined ranged between 10 s and 15 min. A power law ...
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A reflection on the long-term water balance of the Upper Indus Basin
Rapid glacier retreats due to rising temperatures have been predicted in the Hindukush–Karakoram–Himalaya (HKKH). Recent findings indicate shrinking glaciers in parts of the Himalayas, affecting ice storage and ultimately water availability. Insights on ice storage of the HKKH remain controversial, where glaciers retreat in some parts, while surging in others. In high-altitude ...
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Absolute - Pressure (psia) vs Gauge - Pressure (psig)
Here is the scenario: You have just received your brand new Ashcroft Test Gauge. Why??? Because you know that the gauge on your canister is not accurate enough for making reliable quantitative dilutions. You notice that your brand-spanking-new Ashcroft Test Gauge is not reading zero, like so: Now you are starting to FREEAAK OUT!!! Because let’s face it… these gauges are not ...
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Sahara Dust pollutes Southern Greece – this is how Lufft Ceilometers can help
Information related to the range resolved aerosol-cloud physical properties appears to be mandatory for our better understanding of the atmospheric dynamics, air quality and climate change. Recently, the Southern part of Greece suffered from a severe Saharan Dust outbreak. The dust had been driven across the Mediterranean due to strong south winds. The island of Crete was mostly affected by the ...
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Mass flow controllers for Regulating gas flow rates - Case study
For automatic or manual control, Voegtlin’s thermal mass flow controllers allow high precision regulation of gas flow rates and consistent quality of gas mixtures. The fast control response minimises the setting time. CMOS Sensor Technology By using high-precision CMOS technology (semiconductor sensors) Voegtlin’s thermal measurement and control devices are setting new standards in ...
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Understanding the atmospheric measurement and behavior of perfluorooctanoic acid
The recently reported quantification of the atmospheric sampling artifact for perfluorooctanoic acid (PFOA) was applied to existing gas and particle concentration measurements. Specifically, gas phase concentrations were increased by a factor of 3.5 and particle‐bound concentrations by a factor of 0.1. The correlation constants in two particle–gas partition coefficient (KQA) estimation equations ...
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Environmental measurements at Monte Cimone GAW station
Continuous atmospheric CO 2 measurements performed by IAFMC at Mt. Cimone Observatory in the period 1980–2009 were analysed in order to select data representing background concentrations. A filtering technique was used to smooth background data and to separate the annual cycle from the long-term increase. The average growth rate of CO 2 was found to be 1.708 ± 0.003 ppm/year, while annual ...
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Solar Panels
The Customer The Company is a worldwide developer, manufacturer, and distributor of solar electricity panels. The Process The Company uses a multiple zone conventional printing dryer for thin-film deposition onto solar cells. A special foil substrate is passed through rollers that transfer a proprietary ink formulation and epoxy adhesive coating to the film surface. The ink contains mixtures ...
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Xact 625i in Nationwide Atmospheric Network
Xact 625i has been selected for the ASCENT network for characterizing aerosols in high time resolution using state-of-the-art instruments. SailBri Cooper, Inc. is pleased to announce its participation in Atmospheric SCience and mEasurement NeTwork (ASCENT). This new air monitoring network in the United States was made possible by a $12 million grant from the Mid-Scale Research Infrastructure ...
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