Major Factors Affecting PM2.5 Water Content in Seoul and Gosan, Korea

Choi, Eun Kyung; Kim, Y. P.

doi:10.1016/s0021-8502(19)30198-3

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Analysis of the degradation kinetic curves (Figure 1) shows that in the first week of degradation a falling mass of all polymer films in both solutions have been detected. Such a weight loss is associated with the dissolution of water-soluble oligomers of PHA [9]. This is confirmed by the presence of globules on the surface of the films obtained by AFM (Fig.…”

Section: Resultssupporting

confidence: 62%

The Changes in Surface Morphology and Mechanical Properties of Poly(3-Hydroxybutyrate) and its Copolymer Films during <i>In Vitro</i> Degradation

Жуйков

Бонарцев

Bagrov

et al. 2016

SSP

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In the current work, we studied the degradation of PHB films in vitro by pancreatic lipase and in phosphate buffer saline (PBS). We traced the changes in film properties by several analytical methods: the change of weight, surface roughness and morphology (by atomic-force microscopy) and Young’s modulus (by nanoindentation) were measured.PHB is a semicrystalline polymer and thus the films have lamellar structure. During biodegradation, three types of changes were observed on the film surface: appearance of new lamellae, disappearance of lamellae and disintegration of lamellae into shorter fragments. During the six months of polymer films degradation the weight of samples decreased; and an increase in Young's modulus due to the relatively fast degradation of the amorphous areas was observed by nanoindentation.

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Section: Resultssupporting

confidence: 62%

The Changes in Surface Morphology and Mechanical Properties of Poly(3-Hydroxybutyrate) and its Copolymer Films during <i>In Vitro</i> Degradation

Жуйков

Бонарцев

Bagrov

et al. 2016

SSP

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“…The major ionic constituents of PM 2.5 were SO 4 2− , NO 3 − , and NH 4 + , which contributed approximately 43 % (1∼103 %) to the total mass of PM 2.5 on average ( to the concentrations found in Gosan, the national background site (Choi and Kim 2004). In most urban sites in Korea, it has been shown that NO 3 − was significantly higher than NH 4 + (Kim et al 2007;Han et al 2008).…”

Section: Ionic Constituentsmentioning

confidence: 98%

Long-term measurements of atmospheric PM2.5 and its chemical composition in rural Korea

2011

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Long-term measurements of ambient particulate matter less than 2.5 μm in diameter (PM 2.5 ) and its chemical compositions were performed at a rural site in Korea from December 2005 to August 2009. The average PM 2.5 concentration was 31 μg m −3 for the whole sampling period, and showed a slightly downward annual trend. The major components of PM 2.5 were organic carbon, SO 4 2− , NO 3 − , and NH 4 + , which accounted for 55 % of total PM 2.5 mass on average. For the top 10 % of PM 2.5 samples, anionic constituents and trace elements clearly increased while carbonaceous constituents and NH 4 + remained relatively constant. Both Asian dust and fog events clearly increased PM 2.5 concentrations, but affected its chemical composition differently. While trace elements significantly increased during Asian dust events, NO 3 − , NH 4 + and Cl were dramatically enhanced during fog events due to the formation of saturated or supersaturated salt solution. The backtrajectory based model, PSCF (Potential Source Contribution Function) identified the major industrial areas in Eastern China as the possible source areas for the high PM 2.5 concentrations at the sampling site. Using factor analysis, soil, combustion processes, non-metal manufacture, and secondary PM 2.5 sources accounted for 77 % of the total explained variance.

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“…Additionally, the usage rate of political content in podcasts and YouTube differs depending on users’ political orientations. Based on the number of subscribers in the politics and current affairs category on YouTube, the top channels are conservative-oriented (Kuem and Park, 2020; Choi and Kim, 2021). Most popular news content in podcasts, however, is classified as liberal-oriented (CBS Sisa Jockey Production Team, 2017; Park et al, 2020).…”

Section: Literature Reviewmentioning

confidence: 99%

Motives for using news podcasts and political participation intention in South Korea: The mediating effect of political discussion

Cho

Park

Jin-Ho

2023

Media International Australia

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The purpose of this study is to examine Korean listeners’ motivations for listening to political news podcasts drawing on uses and gratifications. This study revealed five motivations: social support, convenience, ease of obtaining political information, diversion/habitual use, and alternative use/de-authoritative flow. The study also confirmed that the extent to which gratifications sought for political news podcasts differs depending on listeners’ political orientations. Liberals have stronger motivations for convenience in use, ease of obtaining political information, and diversion/habitual use compared to conservatives. Furthermore, this research found that the motivations for social support, alternative use, and diversion/habitual use tend to impact political discussions with others, both online and offline, and this process could encourage their intention of political participation as well.

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Major Factors Affecting PM2.5 Water Content in Seoul and Gosan, Korea

Cited by 3 publications

References 3 publications

The Changes in Surface Morphology and Mechanical Properties of Poly(3-Hydroxybutyrate) and its Copolymer Films during <i>In Vitro</i> Degradation

The Changes in Surface Morphology and Mechanical Properties of Poly(3-Hydroxybutyrate) and its Copolymer Films during <i>In Vitro</i> Degradation

Long-term measurements of atmospheric PM2.5 and its chemical composition in rural Korea

Motives for using news podcasts and political participation intention in South Korea: The mediating effect of political discussion

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