Sentences with phrase «emissions measurements of»

The researchers took direct emissions measurements of 230 randomly selected, representative leaks from underground pipelines as well as at 229 metering and regulating stations where natural gas is measured and regulated from higher pressure pipelines to lower pressure distribution pipelines.

2008 G. Matthews, «Celestial body irradiance determination from an under - filled satellite radiometer: Application to albedo and thermal emission measurements of the Moon using CERES» Applied Optics.

Not exact matches

Measurements of the ablation - front trajectory and low - mode nonuniformity in direct - drive implosions using x-ray self - emission shadowgraphy

Measurement of areal density in the ablators of inertial - confinement - fusion capsules via detection of ablator (n, n «gamma) gamma - ray emission

DSC - chemiluminescence Simultaneous measurement of light emission and heat flow - multiple samples can be compared under absolutely identical conditions

More accurate distances between the most common type of «planetary nebulae» and the Earth can be estimated simply with three sets of data: firstly, the size of the object on the sky taken from the latest high resolution surveys; secondly, an accurate measurement of how bright the object is in the red hydrogen - alpha emission line; and thirdly, an estimate of the dimming toward the nebula caused by so called interstellar - reddening.

Next week, the heads of 11 space agencies are expected to issue a joint communique from a meeting in New Delhi calling for cooperation to calibrate instruments and validate measurements «to achieve an international, independent system for estimating the global emissions based on internationally accepted data.»

Direct measurements of methane emissions are not available for all sources of methane..

Global annual emissions calculated from laboratory measurements could reach 1.5 x 1014 grams of methane and 5 x 1016 grams of carbon dioxide.

Field measurements of methane emissions from two termite nests in Guatemala corroborated the laboratory results.

«We now have an independent measurement of these emission sources that does not rely on what was known or thought known,» said Chris McLinden, an atmospheric scientist with Environment and Climate Change Canada in Toronto and lead author of the study published this week in Nature Geosciences.

The study team hopes its measurements of liquid unloadings and pneumatic devices will provide a clearer picture of methane emissions from natural gas well sites and about the relationship between well characteristics and emissions.

Current, sulfur dioxide monitoring activities include the use of emission inventories that are derived from ground - based measurements and factors, such as fuel usage.

The study, published online today in Environmental Science & Technology, provides the most comprehensive set yet of direct measurements of emissions from the distribution system and, with a series of partner studies, is helping to determine the natural gas industry's contribution to U.S. greenhouse gas emissions and to global warming.

The study is the second phase of the team's 2013 study, which included some of the first measurements for methane emissions taken directly at hydraulically fractured well sites.

In late March, the Obama administration released guidance directing U.S. EPA to address methane emissions from the oil and gas industry, after a number of studies measuring emissions from the air, known as «top - down» measurements, showed that the agency's emissions estimates for the industry were too low (ClimateWire, March 31).

The first full day of MAMM flying kicked off at 9 am local time, as the FAAM Atmospheric Research Aircraft (ARA) took to the skies to begin the morning's measurements of wetland emissions.

It has been especially pro-active around the mitigation of carbon emissions and last year, along with the International Tourism Partnership (ITP) and 12 major hotel chains including Hilton, Hyatt, Marriott and Starwood, launched the Hotel Carbon Measurement Initiative, which aims to help hotels reduce, measure and communicate their carbon footprints.

Such a system of measurements can increase the reliability of national emissions estimates.

These studies are supplemented by precise measurements such as those of the diffuse emission at the center of our Galaxy.

They are investigating indoor emissions in other areas of Tibet and plan to link these measurements to a biomarker study based on blood samples of people living in the households.

«The combination of bottom - up soil emission measurements and top - down airborne measurements provide strong evidence for their emission assessments,» he says.

From measurements of the levels and types of emissions from the container, inspectors would be able to deduce the amount of plutonium inside, says Paul White of Los Alamos National Laboratory in New Mexico.

Besides the increased emissions of N2O, the authors observed significant increases in the seasonal release of CO2 and CH4 as a result of only a mild temperature increase, and dug deeply into the reason behind the observed changes by detailed soil and vegetation measurements.

Pourhashem noted the key measurements needed are the rate of soil emission of nitric oxide (NO), which is a smog precursor, after biochar is applied to fields.

They've been hampered by limited carbon dioxide measurements in cornfields, by the fact that annual carbon losses are comparatively small and difficult to measure, and the lack of a proven model to estimate carbon dioxide emissions that could be coupled with a geospatial analysis.

«We decided, based on that information, that we needed additional ways to better identify fugitive emissions and to shine a bright light on those fugitive emissions,» says Eric Stevenson, the district's director of meteorology, measurement and rules.

Although the distribution of these emissions is still uncertain, measurements have indicated that the tropical oceans could be major sources, lofting them into the atmosphere where they can ultimately contribute to reactions that control tropospheric and stratospheric ozone.

Through these measurements, the team will gain a better understanding of the long - term variation in the fire's temperature and emissions.

In the new paper, published in the journal Environmental Research Letters, Höglund - Isaksson estimated global methane emissions from oil and gas systems in over 100 countries over a 32 - year period, using a variety of country - specific data ranging from reported volumes of associated gas to satellite imagery that can show flaring, as well as atmospheric measurements of ethane, a gas which is released along with methane and easier to link more directly to oil and gas activities.

The combination of a long beam - path and high - intensity emission enhances the measurement, so even chemicals present at parts - per - billion levels can be detected.

A new study presents the first measurements of the changing strengths of oxygen emission lines from the present day and back to 12.5 billion years ago.

The study presents the first measurements of the changing strengths of oxygen emission lines from the present day and back to 12.5 billion years ago.

Monitoring network lacks funding NOAA scientists whose observations were used in the study said the research showed the importance of the set of towers and aircraft measurements that monitor greenhouse gas emissions.

David Allen, a University of Texas researcher who conducted measurements from natural gas fields to measure methane emissions, called the study an «important contribution.»

It produces an intense beam of slow - moving neutrons whose photon emissions can be detected with the same setup used for earlier precision measurements of the neutron's lifetime.

Researchers at NASA's Goddard Space Flight Center in Greenbelt, Maryland, are using already available satellite measurements of sulfur dioxide (SO2), a main components of volcanic emissions, along with the more recent ability to map the location and vertical profiles of volcanic aerosols.

From his measurements, he calculates that the emissions have already increased to 620 metric tons in 2008, which is about 16 percent of the 4,000 metric tons that Prather estimates will be produced and used this year.

Data from SUVI will provide an estimation of coronal plasma temperatures and emission measurements which are important to space weather forecasting.

They then used a simple microfluidic layout to flow the microgel and allow a continuous measurement of the fluorescence signal with several emission wavelengths for the multiplexed barcode detection.

The work included data from a variety of sources, including national emissions inventories kept by the United Nations, global estimates of energy use and direct measurements of atmospheric CO2 concentrations, and involved dozens of authors from institutes around the world.

In the time since the 2007 version of this report, the human effect on the climate has grown more than 40 percent stronger, thanks to continued emissions of greenhouse gases and more precision in measurements, with carbon dioxide leading the charge.

Last January was a prime example of what can happen during such measurements: the test candidate, a 2016 diesel Renault Mégane, already displayed high nitric oxide emissions at Empa's test rig.

«Our study is the first example of how atmospheric measurements can help to check on fossil fuel CO2 emissions over an area large enough to encompass nations, provinces or states.»

We obtained direct global measurements of the lunar surface using multispectral thermal emission mapping with the Lunar Reconnaissance Orbiter Diviner Lunar Radiometer Experiment.

However, while field measurements of sulfur dioxide emissions are increasing, they still remain too sparse to piece together a cohesive global picture.

While this number is higher than the previous estimate made in the late 1990s based on ground measurements, the new research includes data on more volcanoes, including some that scientists have never visited, and it is still lower than human emissions of sulfur dioxide pollution levels.

Geochemical records from measurements of the foraminifera shells and fauna analyses will help us evaluate the changes in methane emissions, while studies of living and fossil species distribution and abundance of the benthic foraminifera community in methane seep areas will indicate the degree of methane release through time.

If Mercury were tidally locked, its dark face would be extremely cold, but measurements of radio emission revealed that it was much hotter than expected.

The team of researchers used measurements of radio emissions, taken by the Atacama Large Millimeter Array (ALMA) in the desert of northern Chile, starting in 2015, to detect and map signs of cold gas in the Phoenix cluster.