Biomedical Engineering Reference
In-Depth Information
Ratio of NISM to ISM =1.857,
LPM component = 17.5 mass units
SPM component = 17.5 mass units
Ratio Metric = 1.00
ISM Metric = 35.0 mass units.
The hypothetical APSDs were generated using
1. TM values at 90%, 100%, and 110% of the baseline APSD
2. Non-impactor-sized (NISM) mass to impactor sized mass (ISM) component
ratios from 0.667 (40:60 NISM to ISM) to 3.0 (75:25 NISM to ISM), and
3. LPM component to SPM component split from 0.667 (40:60 LPM to SPM) to
1.50 (75:25 LPM to SPM)
The EDA metrics for each of the hypothetical APSDs were computed and cate-
gorized according to the eight possible types of APSD shifts described in Table 9.1,
a subset of the hypothetical APSDs are provided in Table
9.2
.
An alternative way to look at the detectability of APSD shifts is to examine how
possibilities for APSD changes might be observed by the CI method, and then con-
sider the conditions that would have to exist for EDA to fail as a detection method
(Table
9.3
). It is useful to consider the small particle (
SPF
) and large particle (
LPF
)
mass fractions, rather than the corresponding absolute values of
SPM
and
LPM
for
this type of analysis, as the mass fractions normalize the APSD, making it easier to
identify changes in shape in data comparisons.
From the data shown in Table
9.3
(equivalence conditions), several conditions
can be foreseen where EDA failure would be possible (Table
9.3
). However, before
Table 9.2
EDA metrics representing a subset of the previously described hypothetical APSDs as
compared to the hypothetical baseline APSD characteristics and metrics, and categorized according
to the eight possible scenarios associated with APSD shift s
TM
mass
units
Ratio NISM to
ISM (LPM to
SPM)
Ratio
(LPM to
SPM)
ISM
(LPM + SPM)
mass units
LPM mass
units
SPM mass
units
Scenario
Baseline
100
65:35 (50:50)
17.5
17.5
1.00
35.0
1.
Increased
ratio and
equivalent
ISM
90
61:39 (55:45)
19.3 (↑)
15.8 (↓)
1.22 (↑)
35.1 (
≈
)
61:39 (60:40)
21.1 (↑)
14.0 (↓)
1.50 (↑)
100
65:35 (55:45)
19.2 (↑)
15.8 (↓)
1.22 (↑)
35.0 (
≈
)
65:35 (60:40)
21.0 (↑)
14.0 (↓)
1.50 (↑)
110
68:32 (55:45)
19.4 (↑)
15.8 (↓)
1.22 (↑)
35.2 (
≈
)
68:32 (60:40)
21.1 (↑)
14.1 (↓)
1.50 (↑)
2.
Decreased
ratio and
equivalent
ISM
90
61:39 (40:60)
14.0 (↓)
21.1 (↑)
0.67 (↓)
35.1 (
≈
)
61:39 (45:55)
15.8 (↓)
19.3 (↑)
0.82 (↓)
100
65:35 (40:60)
14.0 (↓)
21.0 (↑)
0.67 (↓)
35.0 (
≈
)
65:35 (45:55)
15.8 (↓)
19.2 (↑)
0.82 (↓)
110
68:32 (40:60)
14.1 (↓)
21.1 (↑)
0.67 (↓)
35.2 (
≈
)
68:32 (45:55)
15.8 (↓)
19.4 (↑)
0.82 (↓)
(continued)
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