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Topic: Emission


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In the News (Tue 23 Apr 19)

  
  APOD Index - Nebulae: Emission Nebulae
The magnificent emission region, the Orion Nebula (aka M42), lies at the upper right of the picture.
Immediately to its left are a cluster of of prominent bluish reflection nebulae sometimes called the Running Man. The Horsehead nebula appears as a dark cloud, a small silhouette notched against the long red glow at the lower left.
Below Alnitak is the Flame Nebula, with clouds of bright emission and dramatic dark dust lanes.
antwrp.gsfc.nasa.gov /apod/emission_nebulae.html   (467 words)

  
 US Air Quality Gradebook - Emission Gradesheets
For the first eight pollutants except lead and its compounds, (CO through SO, except Pb), emissions are based on 1999 data from “Emissions: Criteria Air Pollutants” in the EPA online database AIRData at http://www.epa.gov/air/data/.
The shift of the bell curve by one standard deviation for lead reflects a cleaner national average for this pollutant.
There are two county grades, "self" for the county as determined by its own emission and ambient grades, and "map" for the county as affected by neighboring counties.
www.creativemethods.com /airquality/emission   (867 words)

  
  Emission Control Specialists
If the emission needs to be controlled we will sift through various solutions that may include mist eliminators, fiberbed filters, incinerators, scrubbers and other control devices for an efficient, practical and cost effective remedy.
There are many benefits associated with removing potential pollutants entrained in gaseous emissions before they enter the environment external to the generating source.
Water pollution due to run-off contaminated with gaseous emission fall out can be virtually eliminated by controlling the emission before it can land on exposed surfaces and mix with rainwater.
www.emissioncontrolspecialists.com   (324 words)

  
  Introduction to Emission Factors | Air Quality Planning & Standards | Air & Radiation | US EPA
Emission estimates are important for developing emission control strategies, determining applicability of permitting and control programs, ascertaining the effects of sources and appropriate mitigation strategies, and a number of other related applications by an array of users, including federal, state, and local agencies, consultants, and industry.
An emission factor is a representative value that attempts to relate the quantity of a pollutant released to the atmosphere with an activity associated with the release of that pollutant.
Emission factors may be appropriate to use in a number of situations such as making source-specific emission estimates for areawide inventories.
www.epa.gov /oar/oaqps/efactors.html   (2391 words)

  
 Olympus Microscopy Resource Center: Light and Color - Fluorescence - Overview of Excitation and Emission Fundamentals
This overlap of excitation and emission intensities and wavelengths (illustrated in Figure 1(c)) must be eliminated, in fluorescence microscopy, by means of the appropriate selection for an excitation filter, dichromatic beamsplitter (in reflected light fluorescence), and barrier or emission filter.
The emission intensity peak is usually lower than the excitation peak, and the emission curve is often a mirror image of the excitation curve, but shifted to longer wavelengths.
The separation of excitation and emission wavelengths is achieved by the proper selection of filters to block or pass specific wavelengths of the spectrum as presented in Figure 3.
www.olympusmicro.com /primer/lightandcolor/fluoroexcitation.html   (1833 words)

  
 IDEM - Emission Credit Registry
Emission reductions from any regulated air pollutant for which the United States Environmental Protection Agency (U.S. EPA) has established a National Ambient Air Quality Standard may be registered in the Emission Credit Registry.
Since the emission credits are not truly available until the modification creating the permanence of the emission reductions is issued, the permit action that results in withdrawal of the credits may need to be placed on hold until the first permit is issued.
All emission reductions created on or after this date, and emission reductions generated up to five years prior to this date may be submitted for inclusion in the Emission Credit Registry.
www.in.gov /idem/permits/air/emissioncreditregistry/genandreg.html   (1028 words)

  
 Wisconsin Greenhouse Gas Emission Reduction Cost Study -- Executive Summary
In 1990, fossil fuel consumption produced 89 percent of total Wisconsin greenhouse gas emissions, and in 2010, fossil fuel consumption is projected to produce 90 percent of Wisconsin's greenhouse gas emissions.
For Wisconsin to reduce emissions in 2010 to their 1990 level, annual greenhouse gas emissions in Wisconsin would have to be reduced by about 37 million tons from the projected 2010 emission level.
This emission reduction could be achieved with an annual cost savings of $443 million dollars or an average savings of $27 per ton of CO reduced.
www.dnr.state.wi.us /org/aw/air/global/ghgstudy.htm   (1279 words)

  
 Radio Emission
Non-thermal emission, which does not depend on the temperature of the emitting object, includes synchrotron radiation, gyrosynchrotron emission from pulsars, and amplified emission from masers in space.
For this emission to be strong enough to have any astronomical value, the electrons must be traveling at nearly the speed of light when they encounter a magnetic field; these are known as "relativistic" electrons.
A maser, which stands for "microwave amplification by stimulated emission of radiation", is similar to a laser (which amplifies radiation at or near visible wavelengths).
www.nrao.edu /whatisra/mechanisms.shtml   (2526 words)

  
 PA DEP I/M - Emission Warranties for 1995 and Newer Vehicles
Federally required emission control warranties protect you, the vehicle owner, from the cost of repairs for certain emission related failures that result from manufacturer defects in materials and workmanship or that cause your vehicle to exceed federal emission standards.
If your vehicle failed a federally approved emissions test and has not exceeded the time and mileage limitations for the Performance warranty, any repairs or adjustments necessary for your vehicle to pass should be covered by the manufacturer if the failure was not caused by improper maintenance or abuse.
If emission control components are missing or have been tampered with, or the configuration of the exhaust system has been changed, the emissions warranties on this vehicle may be void.
www.drivecleanpa.state.pa.us /drivecleanpa/news/warr_1995.htm   (3250 words)

  
 BAAQMD - Emission Inventory
Emissions for categories affected by regulations are adjusted to reflect the controls required and the estimated rule effectiveness achieved.
Emissions from on-road motor vehicles are a major portion of the emission inventory and are estimated using computer models developed by ARB.
These indirect emissions are of interest to communities developing GHG reduction strategies, and that seek to identify their total “carbon footprint”.
www.baaqmd.gov /pln/emission_inventory.htm   (1090 words)

  
 Emission factors for greenhouse gases from small scale combustion   (Site not responding. Last check: )
This is partly due to the uncertainty in emission factors and partly due to that in activity data.
In category C, the emission factors are estimated based on a large number of measurements made at a small number of representative facilities, or an engineering calculation derived from a number of relevant facts; typical error range is 50%–150%.
Since it is known that emissions from most solid fuels can vary during the burning process, integrated sampling needs to cover a whole burn cycle (from starting the fire to extinguishing it) in order to obtain emission data that can represent the real burning situation.
static.teriin.org /climate/emission.htm   (2021 words)

  
 Emission Inventory System
There are many other purposes and uses of an emission inventory but in general it is the primary tool to identify where the State currently stands in terms of air pollution and what needs to be done in the future to reduce emissions.
The "Emission Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient Air Quality Standards (NAAQS) and Regional Haze Regulations" guidance published by USEPA on April 1999, EPA-454/R-99-006, defines the required elements of the inventory and recommends to select 1999 as the base year for the emissions inventory.
Since Ohio is similar in industrial activity with other industrial Midwestern States, Ohio’s Title V facilities are expected to emit 95 to 99% of the emissions emitted from all permitted facilities in the state.
www.epa.state.oh.us /dapc/aqmp/eiu/eiu.html   (1346 words)

  
 Electron Emission
Electron emission is actually the basic of tube working principal, it is defined as liberation of free electron from a surface of a substance caused by the externak energy transfered to the electrons.
Electron emission tends to occur on metal, because metal is a substance with much free electron in between its molecul.
Electron emission from a metalic surface by the bombardment of high speed electrons or other particles is known as secondary emission.
www.geocities.com /tube_theory/ElectronEmission.htm   (984 words)

  
 Carbon Dioxide Emission Factors for Coal
The carbon dioxide emission factor was assumed to be a linear function of the parameters associated with the coal rank and State of origin.
The emission factors for coal consumption involving combustion are based on the assumption that all of the carbon in coal is converted to carbon dioxide during combustion.
However, the emission factor for this sector increased sizably during the period, due mainly to the rising use of low-rank coals in the West, and contributed to the increase in emission factors for the overall national average.
www.eia.doe.gov /cneaf/coal/quarterly/co2_article/co2.html   (4272 words)

  
 FAQ - Annual Emission Report
Emission units that have a Federally Enforceable Permit Special Condition have their potential emissions calculated by taking the allowable emission rate (lb/hr) times the allowable amount of hours of operation times the number of identical sources and dividing by 2000 (lb/ton).
The potential emissions for the source are calculated by summing the potential emissions of all emission units.
In general, allowable emissions are calculated by taking the allowable emission rates for each emission unit in pounds/hour multiplied by the allowable hours of operation divided by 2000 pounds/ton.
www.epa.state.il.us /air/aer/faq.html   (2584 words)

  
 Emission Designator List - AFC
Emissions are classified and symbolized according to the following characteristics.
Emission in which the main carrier is amplitude and angle- modulated either simultaneously or in a pre-established sequence
Emission useful for the good functioning of the receiving equipment as, for example, the emission corresponding to the carrier of reduced carrier systems, shall be included in the necessary bandwidth.
www.apcointl.org /frequency/emission.html   (640 words)

  
 Nevada Emissions Control Program
Emission inspections are required for many original vehicle registrations and for each annual renewal.
Once your vehicle has passed the emission inspection and you have received your Vehicle Inspection Report from the inspection station, you may renew your existing vehicle registration at participating stations, on the Internet, by telephone, by mail or in person at a DMV Full-Service or Express office.
If your vehicle has failed the initial emission test, you must repair the vehicle and pass the after repairs emission test to be eligible for registration.
www.dmvnv.com /emission.htm   (1447 words)

  
 Glossary Item - Neutron Emission
During neutron emission, a neutron is ejected from an atom's nucleus.
Since the number of protons within an atom doesn't change during neutron emission, it doesn't change from one element to another.
For example, after undergoing neutron emission, an atom of beryllium-13 (with 9 neutrons) becomes an atom of beryllium-12 (with 8 neutrons).
education.jlab.org /glossary/neutron_emission.html   (77 words)

  
 Emission Inventory
Emissions inventories are used in the context of all air permitting projects to determine applicable regulatory requirements.
Detailed emissions inventory reports were then prepared to present the derived emission rates, as well as pollution control technology descriptions and performance data, stack parameters, and facility operating information.
The required inventory was developed through the application of published emission factors, engineering calculations and measurements conducted by EES staff to determine the composition of fugitive vapors at various points.
www.envengstudies.com /emission_inventory.htm   (1029 words)

  
 Emission Trading Introduction
Emission reductions from energy efficiency and renewable energy produce health and environmental benefits by reducing sulfur dioxide, carbon dioxide, nitrogen oxides, lead, mercury, and particulate matter emissions.
Credits for emission reductions provide an incentive to find the most cost-effective way to reduce emissions, since once an emission reduction credit is created, it can be sold on the open market.
Program buys emission reduction credits that are reported according to the Multiple Pollutant Emission Reduction Reporting System developed by Leonardo Academy with funding from the U.S. Any emission reduction credits or offsets that are purchased are retired.
www.leonardoacademy.org /Resources/introduction.htm   (825 words)

  
 FEI Beam Technology Division: Schottky Emission Cathodes   (Site not responding. Last check: )
Schottky and cold-field emission are superior to thermionic sources in terms of source size, brightness, and lifetime.
The electric field at the emitter is determined by the extraction voltage applied, the spacing between emitter and extraction element, and the sharpness and size of the emitter.
Schottky emission noise is caused by the surface Brownian motion of the W and Zr emitter atoms at 1800 degrees C. The CFE is operated at room temperature, and one might think the noise caused by the surface Brownian motion of the W emitter atoms at 25 degrees C would be less.
www.feibeamtech.com /pages/schottky.html   (772 words)

  
 Ebara Corporation/Zero Emission
The Zero Emission concept proposed by the United Nations University aims to approach the ideal of zero environmental stress by suppressing resource consumption and minimizing waste.
As a means of achieving this objective, the Zero Emission concept can contribute to creation of more effective technology, new production process, as well as conservation and recycling of natural resources including waste into energy.
As a total environmental engineering company committed to the Zero Emission concept, Ebara is making an invaluable contribution; like a vein serving to maintain the health of society's infrastructural and industrial arteries.
www.ebara.co.jp /en/profile/zeroemission.html   (340 words)

  
 Quantum processes
Transitions between vibrational quantum states typically occur in the infrared and transitions between rotational quantum states are typically in the microwave region of the electromagnetic spectrum.
This is the precondition for the light amplification which occurs in a laser, and since the emitted photons have a definite time and phase relation to each other, the light has a high degree of coherence.
Like absorption and emission, stimulated emission requires that the photon energy given by the Planck relationship be equal to the energy separation of the participating pair of quantum energy states.
230nsc1.phy-astr.gsu.edu /hbase/mod5.html   (341 words)

  
 NJDEP Emission Statement Information Page
Emission Statements must be submitted electronically using RADIUS and are due May 15th of the reporting year.
Emission Statements on paper forms are due April 15th of the reporting year.
Emission Statement files will have to be manually attached to an e-mail to the Department or mailed on a disk with a signed paper certification, if necessary, to the Department.
www.state.nj.us /dep/aqm/es/emission.htm   (833 words)

  
 Atomic Absorption and Emission Spectra
Thus, emission spectra are produced by thin gases in which the atoms do not experience many collisions (because of the low density).
The emission lines correspond to photons of discrete energies that are emitted when excited atomic states in the gas make transitions back to lower-lying levels.
Emission or absorption processes in hydrogen give rise to series, which are sequences of lines corresponding to atomic transitions, each ending or beginning with the same atomic state in hydrogen.
csep10.phys.utk.edu /astr162/lect/light/absorption.html   (408 words)

  
 EPA - OTAQ - AP-42:  Compilation of Air Pollutant Emission Factors
As the underlying data sets on in-use emission levels were expanded, EPA's understanding of the many parameters influencing in-use vehicle emission levels increased, and the MOBILE program steadily grew in complexity and sophistication, both to account for these parameters and to provide more user-controlled options.
Section II provided emission factor information, in the form of look-up tables, for a wide range of off-road mobile sources (including agricultural equipment, construction equipment, lawn and garden equipment, aircraft and aircraft engines, locomotives, marine vessels, and miscellaneous types of equipment).
The 1990 amendments to the Clean Air Act directed EPA to conduct a study of the emissions from and air quality impact of these many nonroad sources, and to make a determination as to whether regulation of such emissions should be pursued.
www.epa.gov /otaq/ap42.htm   (1311 words)

  
 Quantum processes
Transitions between vibrational quantum states typically occur in the infrared and transitions between rotational quantum states are typically in the microwave region of the electromagnetic spectrum.
This is the precondition for the light amplification which occurs in a laser, and since the emitted photons have a definite time and phase relation to each other, the light has a high degree of coherence.
Like absorption and emission, stimulated emission requires that the photon energy given by the Planck relationship be equal to the energy separation of the participating pair of quantum energy states.
hyperphysics.phy-astr.gsu.edu /hbase/mod5.html   (341 words)

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