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Topic: Mass concentration

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	53.62 Test procedure: Full wind tunnel test.
		Effectiveness is the ratio (expressed as a percentage) of the mass concentration of particles of a specific size reaching the sampler filter or filters to the mass concentration of particles of the same size approaching the sampler.
		The cross-sectional uniformity of the particle concentration in the sampling zone of the test section shall be established during the tests using an array of isokinetic samplers, referred to as a rake.
		After cross-sectional uniformity has been confirmed, a single isokinetic sampler may be used in place of the array of isokinetic samplers for the determination of particle mass concentration used in the calculation of sampling effectiveness of the test sampler in paragraph (d)(5) of this section.
	www.setonresourcecenter.com /CFR/40CFR/P53_053.HTM (2231 words)

	Calculation of mass concentration in a flue gas analyser
		Mass concentration of gas elements depends on the gas pressure and temperature.
		The concentration value is calculated from the concentration expressed in ppm using the factor A from table 5.
		As well as absolute mass concentration, the mass concentration in relation to the oxygen concentration in the combustion gases is calculated.
	www.habmigern2003.info /215_mass-concentration.html (610 words)

	Concentration - Wikipedia, the free encyclopedia
		Often in informal, non-technical language, concentration is described in a qualitative way, through the use of adjectives such as "dilute" or "weak" for solutions of relatively low concentration and of others like "concentrated" or "strong" for solutions of relatively high concentration.
		Mass percentage denotes the mass of a substance in a mixture as a percentage of the mass of the entire mixture.
		This works fine for gas concentrations (e.g., ppmv of carbon dioxide in the ambient air) but, for concentrations of non-gaseous substances such as aerosols, cloud droplets, and particulate matter in the ambient air, the concentrations are commonly expressed as μg/m³ or mg/m³ (e.g., μg or mg of particulates per cubic metre of ambient air).
	en.wikipedia.org /wiki/Concentration (3133 words)

	Calculating Nutrient Loads (Site not responding. Last check: 2007-10-10)
		A concentration of 1 ppm phosphorus is equivalent to 1 lb of phosphorus in approximately 120,048 gal of water (1 gal of water = 8.33 lb).
		A concentration of 1 ppb is 1/1,000 of a ppm.
		The concentration curve in Figure 2 shows an initially high P concentration, typical of a "first-flush" type event, where large amounts of P-bearing particulate matter and sediments near the pump intake are initially discharged.
	edis.ifas.ufl.edu /AE149 (5168 words)

	Mass DEP :: MA DEP - URANIUM ACTIVITY TO MASS CONVERSION FACTOR GUIDELINE
		The regulatory level for uranium in drinking water is reported in mass units (ug/l) and results that are reported in activity units (picocuries per liter or pCi/l), must be converted to the appropriate mass units to make the appropriate determination of whether or not the system is in compliance.
		Activity to mass conversion factors range from 0.67 to 1.5 pCi/ug (USEPA 2000) and the major challenge is to determine which factor is most appropriate to use to calculate an exposure point concentration for compliance monitoring or to use in a human health risk assessment.
		Therefore, the concentration calculated using the default activity to mass ratio is likely to be an overestimate of the true concentration and it is therefore appropriate to compare to the MCL as a screening evaluation.
	www.mass.gov /dep/water/drinking/uconvert.htm (852 words)

	ChEE & Cooking
		Mass transfer is another important concept in the field of chemical engineering and science in general.
		Mass has the tendency to move from an area of high concentration to an area of low concentration.
		Mass transfer can also be seen when a glass of water is left on the table overnight.
	blowers.chee.arizona.edu /cooking/mass/mass.html (504 words)

	Local Mass Closure
		mass derived from the number size distribution where a) the number distribution was converted to a volume size distribution and b) density derived from the 7-stage impactor measurements was used to convert from a volume to a mass size distribution.
		One further comparison of gravimetrically-determined mass was made wherein impactor samples collected at the base of the sampling mast at 50% RH were compared to open face filter samples collected outside near the inlet of the sampling mast.
		This agreement indicates that the aerosol mass concentration was similar at the two platforms and that, perhaps, the gravimetrically-determined mass at Cape Grim is too high.
	saga.pmel.noaa.gov /Field/ace1/hilo/mass.html (931 words)

	The Proposed Model
		The mass concentration of one phase of the fluid.
		We assume that the flux of the substrate is proportional to the concentration of substrate, with constant of proportionality denoted 45#45.
		We denote the concentration of one phase of the fluid as 103#103.
	www.math.utah.edu /~cogan/research/paper/node24.html (1706 words)

	53.64 Test procedure: Static fractionator test.
		Effectiveness is determined by measuring the aerosol mass concentration sampled by the candidate sampler's after filter versus that which exists in a static chamber.
		The aerosol concentration is calculated as the measured aerosol mass divided by the sampled air volume.
		Effectiveness under static conditions is the ratio (expressed as a percentage) of the mass concentration of particles of a given size reaching the sampler filter to the mass concentration of particles of the same size existing in the test atmosphere.
	www.setonresourcecenter.com /CFR/40CFR/P53_055.HTM (2249 words)

	Lab #2: Yeast Fermentation
		The dissolved oxygen concentration in the culture medium is monitored in situ by a galvanic probe containing a silver anode and a lead electrode in an acetate electrolyte.
		The current generated is proportional to the dissolved oxygen concentration in the culture medium and is calibrated with the maximum solubility of oxygen in the culture medium when sparged with pure oxygen.
		If the absorbance reading is greater than 0.25, a typical limit of linear correlation between the absorbance and cell mass concentration, dilute the sample with a known amount of pure medium, and measure the absorbance again to check if the absorbance reading is on the linear portion of the calibration curve.
	spot.colorado.edu /~kompala/lab2.html (1618 words)

	Mass DEP :: Glossary - Quality Assurance Terminology
		Continuing Calibration - A mid-range concentration standard that is analyzed on a daily basis and is compared with the continuing calibration of fidelity to the regression relationship established using the continuing calibration.
		A mass spectrum is a characteristic pattern of mass to charge fragments generated from the bombardment of individual compounds in the gas phase.
		Mass spectra of unknown compounds can be compared to the spectra from standard mass spectral libraries.
	www.mass.gov /dep/cleanup/laws/glossa01.htm (6907 words)

	11/24/04
		A more useful concentration unit is one that represents the number of molecules or ions dissolved in either a unit mass or unit volume of water.
		The molal concentration is moles solute/kg solvent (i.e.
		In addition to converting mass/volume or mass/mass concentration units for ionic solutes to units of mol/L (molar, M) or mol/kg (molal, m) concentration, it is also useful to determine the moles of charge corresponding to a given molal or molar concentration.
	www.geology.wisc.edu /~jmbahr/g627/l11_24.html (924 words)

	Environmental Protection Agency > Basic Concepts in Environmental Sciences > Module 4 > Concentration
		The concentrations of pollutants in solvents are usually low and are often expressed as parts per million (ppm) or milligrams per liter (mg/L).
		Liquid concentrations are often expressed as a ratio of masses as shown in Equation 1.
		The concentrations of the pollutants in liquids are often expressed on a parts per million (ppm) basis.
	www.epa.gov /eogapti1/module4/concent4/concent4.htm (939 words)

	Lecture 3
		Some 80% of the mass of the atmosphere is within 10 km of the surface of the Earth, which has a diameter of about 12,742 km.
		the mass of 1 mole of H (hydrogen) atoms is 1.008 g because hydrogen atomic mass is 1.008 amu;
		the mass of 1 mole of O (oxygen) atoms is 16 g because oxygen atomic mass is 16 amu.
	irina.eas.gatech.edu /lectures/Lec3.html (2336 words)

	RMP Lecture Notes
		Concentration is based on volume and is one way of expressing composition.
		The mass concentration is the mass of a component per unit volume, similarly molar concentration is the moles per unit volume.
		Concentration is grams solute divided by the volume of the mixture (water and solute).
	www.cbu.edu /~rprice/lectures/compos.html (822 words)

	Mass Percent (Site not responding. Last check: 2007-10-10)
		Mass percent concentration is defined as the mass of the solute in grams multiplied by 100 divided by the mass of the solution in grams.
		We could use any unit that we wished for mass as long as we were consistent in using the same unit for the solute mass as well as the solution mass.
		Mass percent concentration unit is often used in the Allied Health Professions.
	members.aol.com /profchm/masspct.html (560 words)

	Mass concentration - Wikipedia, the free encyclopedia
		A mass concentration or mascon is a region of a planet or moon's crust that contains a large positive gravitational anomaly.
		In general, the word "mascon" can be used as a noun to describe an excess distribution of mass on or beneath the surface of a planet (with respect to some suitable average), such as Hawaii.
		However, this term is most often used as an adjective to describe a geologic structure that has a positive gravitational anomaly, such as the "mascon basins" on the Moon.
	en.wikipedia.org /wiki/Mascon (566 words)

	For presentation at the Air & Waste Management Association’s 90th Annual Meeting & Exhibition, June 8-13, ... (Site not responding. Last check: 2007-10-10)
		A verification of the fine mass maps was accomplished by comparing the measured fine mass concentrations to the interpolated fine mass following the interpolation to ensure the observed data were not modified in the process.
		and it is proportional to the concentration of light scattering and absorbing aerosols and gases.
		During quarter 3, the visibility surrogate decreased concentrations from the initial fine mass map in large areas of the west, such as the Oregon, Nevada, and Northern California area and the region extending from Montana southward to Colorado.
	capita.wustl.edu /CAPITA/Awma98/HTTP/98_A918.htm (5466 words)

	Castleton Communication Facilities
		Students in the mass media concentration receive a broadbased education on the way our media system works and how they may best contribute to that field.
		Graduates of this concentration now work in network television operations, programming and production; all aspects of radio; major audio and video production companies; satellite delivery systems; and a vast array of other positions many of which did not even exist when they entered college.
		Among the graduates of the Journalism Concentration are writers and editors for large and small newspapers and magazines.
	www.castleton.edu /communication/programs.htm (1142 words)

	Mass Concentration of Plasma Phospholipid Transfer Protein in Normolipidemic, Type IIa Hyperlipidemic, Type IIb ...
		Mass Concentration of Plasma Phospholipid Transfer Protein in Normolipidemic, Type IIa Hyperlipidemic, Type IIb Hyperlipidemic, and Non—Insulin-Dependent Diabetic Subjects as Measured by a Specific ELISA -- Desrumaux et al.
		PLTP mass was determined by ELISA, and phospholipid transfer activity was determined by an isotopic transfer assay as described under Methods.
		Correlation of PLTP mass concentration with glycemia (upper panel) and HbA1c (lower panel) in NIDDM patients (n=50).
	atvb.ahajournals.org /cgi/content/full/19/2/266 (6353 words)

	Statute: § 53.62 Test procedure: Full wind tunnel test.
		The mean wind speed in the test section must be within [-] 10 percent of the value specified in Table F-2 of this subpart, and the variation at any test point in the test section may not exceed 10 percent of the measured mean.
		All flow rate measurements used to calculate the test atmosphere concentrations and the test results must be accurate to within [+--] 2 percent, referenced to a NIST-traceable primary standard.
		C[cand(est)] = estimated mass concentration measurement for the test sampler, [mu]g/m<3>; and C[ref(est)] = estimated mass concentration measurement for the reference sampler, [mu]g/m<3> (calculated for the reference sampler and specified at the bottom of column 7 of Table F-4 of this subpart).
	www.arb.ca.gov /bluebook/bb05/40cfr/40cfr53_62.htm (2195 words)

	Orbital heating and bulge shocking
		Because heating rates depend on cluster profile, tidal truncation and orbit, comparisons in different physical regimes are needed to demonstrate the primary influences of heating on cluster evolution.
		In these comparisons, clusters of a particular mass and concentration are identical and clusters of differing mass and concentration possess the mean density required for tidal limitation.
		In many cases, evaporation time does not vary strongly with concentration for the same orbit and mass, indicating that overall mass loss rates are insensitive to initial concentration.
	donald.phast.umass.edu /preprints/theory/murali2/node9.html (1046 words)

	The Molar Concentration
		The molar concentration of a substance X in solution is defined as the amount of X dissolved per unit volume of solution.
		In those circumstances in which it is clear that other kinds of concentration (like the mass concentration) are not intended, the abridged term 'concentration' is perfectly acceptable.
		Either the concentration of B is known or it is not.
	www.emporia.edu /chemist/davies/third.htm (2870 words)

	Conversion Factors - Density, Mass Concentration
		Karat concentration (1 of gold to 24 of mixture) = 41.667 milligrams per gram.
		Milligram per assay ton concentration = 1 troy ounce per 2000 avoirdupois pounds, 34.276 milligrams per kilogram.
		Milligram per kilogram concentration = 0.002 avoirdupois pound per 2000 pound ton, 0.029175 milligram per assay ton, 0.032000 avourdupois ounce per 2000 pound ton, 1 gram per metric ton.
	www.ceramics.com /cvdensit.html (438 words)

	Verica: SCM
		The described behavior of the surface precipitation is independent on the number concentration of cloud droplets.
		KK parameterization's fall velocities for number and mass concentrations are with comparable values, while SB parameterization's fall velocities are much stronger for the mass concentration than for number concentration
		SB parameterization of autoconversion contains the correction that depends on the mass concentration of rain/drizzle drops; this was analyzed by calculating the tendencies of mass concentrations for a range of rain/drizzle droplet sizes:
	www.atmos.ucla.edu /~verica/les/SngClmn (1572 words)

	EO Newsroom: New Images - Mass Concentration in Antarctica
		Not far from the coast is a 320-kilometer-wide mass concentration, outlined in white.
		The mass concentration GRACE detected indicates an area containing unusually dense material.
		According to Von Frese, the mass concentration GRACE detected in Antarctica could be the crater from an asteroid that triggered the Permo-Triassic extinction.
	earthobservatory.nasa.gov /Newsroom/NewImages/images.php3?img_id=17375 (486 words)

	[No title]
		A very concentrated feed is being provided to the fermentor in such a way that the change in volume is negligible.
		Mass balances for the main components for a fed-batch reaction.
		The variation of the product concentration with time is again given by a combination of equations (3.6.2.27) and (3.6.2.21).
	userpages.umbc.edu /~gferre1/derivations.html (1922 words)

	Statute: § 53.64 Test procedure: Static fractionator test.
		This device must have a minimum range of 1 to 10 [mu]m, a resolution of 0.1 [mu]m, and an accuracy of 0.15 [mu]m such that primary particles may be distinguished from multiplets for all test aerosols.
		(B) If the value of CV[total] exceeds 10 percent, then the particle concentration uniformity is unacceptable, alterations to the static chamber test apparatus must be made, and steps in paragraphs (f)(1) through (f)(5) of this section must be repeated.
		Follow the steps outlined in § 53.62(e)(3) through (e)(4) to calculate the estimated concentration measurement ratio between the candidate sampler and a reference method sampler.
	www.arb.ca.gov /bluebook/bb05/40cfr/40cfr53_64.htm (2253 words)

	[No title]
		The number of particles with the potential to cross B-B' from left to right (positive mass flux) is (C1 EMBED Equation.3 A), where A is the area of interface B-B'.
		X, is proportional to the gradient of concentration in that direction, EMBED Equation.3 , and is counter-gradient, i.e.
		Based on these limits, it has become common to define the extent of a concentration patch based on the contour that includes ninety-five percent of the total mass, i.e.
	web.mit.edu /1.061/www/diffuse/theory.doc (1556 words)

	Real-Time Mass Concentration Spectrometer - CTS Research Project Database
		This project develops a new sensor capable of measuring mass concentrations of aerosol particles resolved into a number of size bins in real time.
		The mass concentrations in all size bins would be simultaneously sampled with essentially instantaneous sampling time, and the sampling rate would be adjustable such that the time history of the concentrations in each bin would be continuously monitored in real time.
		The new sensor uses a combination of inertial separation and optical sensing to obtain the necessary sensitivity to particle mass with the desired time response.
	www.cts.umn.edu /research/projectdetail.pl?id=1994001 (151 words)

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