Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Accumulation mode

The aerodynamic size distribution of radionuclide-associated aerosol particles is, as mentioned in Section 2, a surface distribution, and so it is trimodal, the first mode being the so-called Aitken nuclei mode, the second the accumulation mode and the third the coarse particle mode. Analytically, these modes can be summarised as follows  [Pg.7]

The nuclei or Aitken nuclei mode accounts for most of the Aitken nuclei count and originates primarily from the condensation and coagulation of highly supersaturated vapours. There is evidence that a prominent nuclei mode in the size distribution indicates the presence of substantial amounts of fresh aerosol. Many particles in the nuclei mode raise the Aitken nuclei. Usually, they do not greatly increase the aerosol mass concentration because the nuclei mode rarely accounts for more than a few percent of the total mass. [Pg.7]

Whitby et al. (1975) found that the nuclei mode may contain over 25 Jgm of aerosol. Whitby et al. (1976) also observed distributions in which the nuclei mode contained more volume than the accumulation mode. Because particies may serve as nuclei for the condensation of water vapour, condensation is an important growth mechanism for submlcrometre aerosol particles. Examples are fogs and hazes formed when the humidity exceeds 60%. [Pg.7]

The twin mechanisms of coagulation and heterogeneous nucleation (condensation of one materiai to another) tend to accumulate submicrometre aerosol particle mass in this mode (Whitby and Cantrell, 1976 Willeke and Whitby, 1975). Because of the sharp decrease in particles larger than 0.3 pm in diameter, little mass is transferred from the accumulation mode to the coarse particle size range. Sedimentation and impaction tend to increase the relative concentration of the smallest mechanically produced particles, and then accumulate in this mode. Salt from sea spray is typically present as particles in the 1-5 pm size range, outside the normal accumulation mode. [Pg.7]

In the coarse particle mode, practically all aerosol particles at relative humidities below 100% originate from meehanical processes. Most of the particles originate from condensation processes occurring in the atmosphere. Coarse particles are produced from natural and/or man-made (anthropogenic) mechanical processes. The origin, behaviour and removal processes of fine particles are almost entirely independent of the coarse particles. [Pg.8]


Fig. 6. Size distribution of an urban aerosol showing the three modes containing much of the aerosol mass. The fine mode contains particles produced by condensation of low volatility gases. The mid-range, or accumulation mode, results from coagulation of smaller aerosols and condensation of gases on preexisting particles. Coarse particulates, the largest aerosols, are usually generated mechanically. Fig. 6. Size distribution of an urban aerosol showing the three modes containing much of the aerosol mass. The fine mode contains particles produced by condensation of low volatility gases. The mid-range, or accumulation mode, results from coagulation of smaller aerosols and condensation of gases on preexisting particles. Coarse particulates, the largest aerosols, are usually generated mechanically.
Figure 14-10. Schematic view of the concluding channel of a TFT in Ihc accumulation mode al saturation. Figure 14-10. Schematic view of the concluding channel of a TFT in Ihc accumulation mode al saturation.
Because the particles in the accumulation mode are very small (most of them have diameters less than 1 pm when dry), they have very small fall speeds (a 1 /im sphere of unit density has a fall speed of about 10 cm/s). Thus, they are only removed in any quantity by the formation of clouds with subsequent precipitation. [Pg.153]

Chu et al. (1987) present results of laboratory studies of the formation of an ultrafine aerosol by converting SO- to sulfuric acid using measurement methods described by Holub and Knutson (1987) and Kulju et al. (1987). It was found that the size of the resulting activity distributions is dependent on the S02 concentration. The role of humidity is still unclear and more studies are needed, but it appears that both future theoretical models and laboratory studies will be extremely fruitful in elucidating the behavior of Po-218 from shortly after its formation until its incorporation into the existing accumulation mode aerosol. [Pg.10]

As indicated above, there is a relationship between particle concentration, equilibrium factor and the amount of highly mobile radioactive particles. Removal of the accumulation mode particles may decrease the decay product exposure, but increase the dose because of the high effectiveness of the "unattached activity in dose deposition. Thus, air cleaning may not succeed in lower risk unless both factors are taken into account. Jonassen explores electrostatic filtration in this context. Finally, design considerations are presented for a possible alternative control system using activated carbon in an alternating bed system. [Pg.12]

Recoil of RaB ions from aerosol particles is taken into account in the way proposed by Mercer (6). If RaA ions or molecules are attached to aerosol particles in the accumulation mode, it is assumed that they remain on the surface of the particles for RaA... [Pg.331]

The environmental conditions for each of the cases considered below are summarized in Table III all these parameters are constant in time. The build up of the nucleation mode of the stable particles and the build up of both the nucleation and accumulation modes of the radon decay products is calculated, and the results are given after a process time of one hour. Figures 1 to 5 show the size distributions of stable and radioactive particles, and Table IV gives the disequilibrium, the equilibrium factor F, the "unattached fraction" f and the plate-out rates for the different daughters. [Pg.332]

The Po-218 activity was also attached to particles in the accumulation mode peak in the 0.1 to 1.0 pm range. The Po-214 (RaC ) activity was only observed in the accumulation mode and not associated with the ultrafine particles. Thus, the initial motion and deposition of much of the polonium-218 may be related to the transport by these ultrafine clusters. [Pg.370]

Table I presents the average aerodynamic distributions of Pb-212 and Pb-214, as well as the frequency with which Pb-214 or Pb-212 was the dominant isotope in each size range. The Aitken nuclei fraction (below 0.08 pm) contained a higher percentage of Pb-212 activity compared with Pb-214 in 69.6% of the measurements. The predominance of Pb-212 in this fraction is also illustrated by the distributions reported in Figure 1. In the remaining measurements, where Pb-214 was fractionally more abundant below 0.08 um, the disparity between the relative amounts of each isotope was not nearly as dramatic. Conversely, Figure 1 and Table I illustrate that Pb-214 is generally enriched in the accumulation mode aerosol, particularly between 0.11 and 0.52 ]xm, where most of the surface area and mass occurs. Table I presents the average aerodynamic distributions of Pb-212 and Pb-214, as well as the frequency with which Pb-214 or Pb-212 was the dominant isotope in each size range. The Aitken nuclei fraction (below 0.08 pm) contained a higher percentage of Pb-212 activity compared with Pb-214 in 69.6% of the measurements. The predominance of Pb-212 in this fraction is also illustrated by the distributions reported in Figure 1. In the remaining measurements, where Pb-214 was fractionally more abundant below 0.08 um, the disparity between the relative amounts of each isotope was not nearly as dramatic. Conversely, Figure 1 and Table I illustrate that Pb-214 is generally enriched in the accumulation mode aerosol, particularly between 0.11 and 0.52 ]xm, where most of the surface area and mass occurs.
Accumulation mode, aerosol particles, 328 Actinon—See Radon-219... [Pg.585]

The reflection intensities can be measured as the sums of the intensities recorded at each point of the scanned profile. The computer of the system can carry out the measurement in both accumulation mode (to achieve the same required statistical accuracy for all reflections either strong or weak) or in constant time mode. Although in accumulation mode, precision of the order of 1% can be achieved for all reflections in the ED pattern (dynamical range of 10 ), measurement time is within the order of 10 min up to now. However, it is foreseen that in near future, measurement times of 1 min can be achieved for up to 50 reflections. [Pg.174]

Once the region to be scanned is selected, the pattern can be automatically indexed with a separate window in the software interface (Fig. 6c) permits the user to define the scanning step resolution or the time that the reflection can be measured in accumulation mode. After measurement, all reflections are given with intensities corrected from background. [Pg.178]

Misorientation can be an issue during the time of collection of ED patterns as sometimes this can exceed 60 min in accumulation mode, and d5mamical diffraction contribution is observed (we may anticipate its presence due to the appearence of forbidden kinematically reflections in the pattern like +- 002). However, is important to note that misorientation effects become less critical and intensity of such forbidden reflections is lowered after applying precession mode to the ED pattern. Similar results have also been observed by M.Gemmi with Si samples. [Pg.180]

Figure 5.6 Schematic cross-section of an improved high-voltage 4H-SiC accumulation mode UMOSFET. (From [25], 1998 IEEE. Reprinted with permission.)... Figure 5.6 Schematic cross-section of an improved high-voltage 4H-SiC accumulation mode UMOSFET. (From [25], 1998 IEEE. Reprinted with permission.)...
As discussed earlier in Section 5.2, introducing thin n-type buried layers under the gate oxide is expected to improve channel mobility. The accumulation mode DMOS structure, referred to as ACCUFET, has been patented by Baliga in 1996 [35]. Experimental results on this structure implemented in 6H-SiC have been published in work [36]. Similar devices implemented in 4H-SiC and referred to as Accu-DMOSFET have been reported later by Singh et al. [37]. [Pg.166]

In Figure 2 we show the amount of Al, Fe, Sc, V, U, and Se in particles per log-size-interval of each impactor stage, per m of gas plotted against the mass median diameters (mmd) of Table I. Note that in choosing the mmd and log-size interval for the filter, we assumed that the submicrometer distribution is log-normal and that all of the mass on the filter is contained in particles of diameters between 0.01 and 0.07 Mm. These data suggest that the impactor intervals nicely bracket the accumulation mode that occurrs at 0.11 Mm. [Pg.178]

FIGURE 9.7 Schematic of an atmospheric aerosol size distribution showing four modes. The original hypothesis of Whitby and co-workers is shown by the solid, trimodal curves, and the fourth, ultrafine particle mode, as well as the two peaks sometimes observed in the accumulation mode are shown by the dashed lines (adapted from Whitby and Sverdrup, 1980). [Pg.355]

While many particle distributions show one peak in the accumulation range, many instances have been observed in which there are two peaks. For example, as seen in Fig. 9.8, John and co-workers (1990) observed two peaks within the traditional accumulation mode, one at 0.2 0.1 and one at 0.7 0.2 yu,m, in studies of... [Pg.356]

Two peaks in the accumulation mode may also result if the particles are externally mixed rather than internally mixed (the latter meaning that all particles have the same composition corresponding to a mixture of the various components). That is, the composition of individual particles may not be the same as the overall bulk particle composition, with some having more hygroscopic components than others. These are referred to as externally mixed particles indeed single-particle analyses suggest that externally mixed particles are common (see Chapter 11.B.4). In this case, a... [Pg.357]

Aitken Nuclei Accumulation Mode Coarse Particles... [Pg.357]

In short, growth of sulfate particles at least in the accumulation mode and the presence of two peaks are both believed to be largely controlled by interactions with water in the atmosphere, including the aqueous phase oxidation of SOz to sulfate. [Pg.358]


See other pages where Accumulation mode is mentioned: [Pg.373]    [Pg.373]    [Pg.373]    [Pg.253]    [Pg.253]    [Pg.253]    [Pg.267]    [Pg.563]    [Pg.579]    [Pg.139]    [Pg.153]    [Pg.153]    [Pg.155]    [Pg.331]    [Pg.331]    [Pg.332]    [Pg.333]    [Pg.339]    [Pg.339]    [Pg.396]    [Pg.85]    [Pg.102]    [Pg.277]    [Pg.277]    [Pg.163]    [Pg.322]    [Pg.357]   
See also in sourсe #XX -- [ Pg.312 ]

See also in sourсe #XX -- [ Pg.22 , Pg.51 ]

See also in sourсe #XX -- [ Pg.3 ]

See also in sourсe #XX -- [ Pg.233 ]

See also in sourсe #XX -- [ Pg.108 , Pg.109 , Pg.115 ]

See also in sourсe #XX -- [ Pg.59 ]

See also in sourсe #XX -- [ Pg.219 ]

See also in sourсe #XX -- [ Pg.219 ]




SEARCH



Accumulation Mode Extrinsic Silicon

Accumulation Mode, Linear Regime

Accumulation Mode, Saturation Regime

Accumulation mode composition

Accumulation mode definition

Accumulation mode mobility

Accumulation mode modes

Accumulation mode particles

Accumulation mode size distributions ambient

Accumulation mode sources

Accumulation mode, atmospheric particles

Aerosol accumulation mode

Electron-accumulation mode, OFET

Hole-accumulation mode, OFET

Size distribution accumulation mode

© 2024 chempedia.info