ELIZA cgi-bash version rev. 1.91
- Medical English LInking keywords finder for the PubMed Zipped Archive (ELIZA) -

return kwic search for significant out of >500 occurrences
583352 occurrences (No.14 in the rank) during 5 years in the PubMed. [cache]
71) The significant changes in source emissions indicate a substantially reduced traffic volume after the implement of lockdown measures.
--- ABSTRACT ---
PMID:33189385 DOI:10.1016/j.scitotenv.2020.143548
2021 The Science of the total environment
* Changes in source contributions to particle number concentrations after the COVID-19 outbreak: Insights from a dispersion normalized PMF.
- Factor analysis models use the covariance of measured variables to identify and apportion sources. These models, particularly positive matrix factorization (PMF), have been extensively used for analyzing particle number concentrations (PNCs) datasets. However, the variation of observed PNCs and particle size distribution are driven by both the source emission rates and atmospheric dispersion as well as chemical and physical transformation processes. This variation in the observation data caused by meteorologically induced dilution reduces the ability to obtain accurate source apportionment results. To reduce the influence of dilution on quantitative source estimates, a methodology for improving the accuracy of source apportionment results by incorporating a measure of dispersion, the ventilation coefficient, into the PMF analysis (called dispersion normalized PMF, DN-PMF) was applied to a PNC dataset measured from a field campaign that includes the Spring Festival event and the start of the COVID-19 lockdown in Tianjin, China. The data also included gaseous pollutants and hourly PM2.5 compositional data. Eight factors were resolved and interpreted as municipal incinerator, traffic nucleation, secondary inorganic aerosol (SIA), traffic emissions, photonucleation, coal combustion, residential heating and festival emissions. The DN-PMF enhanced the diel patterns of photonucleation and the two traffic factors by enlarging the differences between daytime peak values and nighttime concentrations. The municipal incinerator plant, traffic emissions, and coal combustion have cleaner and more clearly defined directionalities after dispersion normalization. Thus, dispersion normalized PMF is capable of enhancing the source emission patterns. After the COVID-19 lockdown began, PNC of traffic nucleation and traffic emissions decreased by 41% and 44%, respectively, while photonucleation produced more particles likely due to the reduction in the condensation sink. The significant changes in source emissions indicate a substantially reduced traffic volume after the implement of lockdown measures.
--- ABSTRACT END ---
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(1)20 increase (21)5 and (41)2 DDIs (61)2 heterogeneity
(2)16 differences (22)5 improvement (42)2 adverse (62)2 impacts
(3)15 difference (23)5 results (43)2 antioxidant (63)2 impairment
(4)13 reduction (24)5 risk (44)2 at (64)2 implications
(5)11 changes (25)4 amount (45)2 barriers (65)2 increased
(6)10 association (26)4 associations (46)2 being (66)2 induction
(7)10 improvements (27)4 burden (47)2 benefits (67)2 interaction
(8)10 positive (28)4 clinical (48)2 cause (68)2 loci
(9)10 role (29)4 public (49)2 challenges (69)2 morbidity
(10)9 impact (30)3 advances (50)2 clusters (70)2 number
(11)8 decrease (31)3 as (51)2 cognitive (71)2 personal
(12)8 in (32)3 evidence (52)2 consequence (72)2 portion
(13)7 *null* (33)3 expression (53)2 contribution (73)2 relationship
(14)7 effect (34)3 gaps (54)2 correlation (74)2 sequence
(15)6 effects (35)3 health (55)2 factor (75)2 survival
(16)6 increases (36)3 highly (56)2 finding (76)2 than
(17)6 progress (37)3 inhibition (57)2 findings (77)2 therapeutic
(18)6 proportion (38)3 interactions (58)2 for (78)2 trend
(19)6 reductions (39)3 predictors (59)2 fraction (79)2 variation
(20)5 (p (40)3 upregulation (60)2 functional (80)2 variations

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--- WordNet output for significant --- =>意義深い, 重大な, 意味のある, 意味ありげな, 重要な Overview of adj significant The adj significant has 4 senses (first 4 from tagged texts) 1. (18) significant, important -- (important in effect or meaning; "a significant change in tax laws"; "a significant change in the Constitution"; "a significant contribution"; "significant details"; "statistically significant") 2. (9) significant, substantial -- (fairly large; "won by a substantial margin") 3. (3) significant -- (too closely correlated to be attributed to chance and therefore indicating a systematic relation; "the interaction effect is significant at the .01 level"; "no significant difference was found") 4. (2) meaning, pregnant, significant -- (rich in significance or implication; "a meaning look") --- WordNet end ---