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Opis: Atmospheric mineral dust influences Earth’s radiative budget, cloud formation, and lifetime; has adverse health effects; and affects air quality through the increase of regulatory PM10 concentrations, making its real-time quantification in the atmosphere of strategic importance. Only few near-real-time techniques can discriminate dust aerosol in PM10 samples and they are based on the dust chemical composition. The online determination of mineral dust using aerosol absorption photometers offers an interesting and competitive alternative but remains a difficult task to achieve. This is particularly challenging when dust is mixed with black carbon, which features a much higher mass absorption cross section. We build on previous work using filter photometers and present here for the first time a highly timeresolved online technique for quantification of mineral dust concentration by coupling a high-flow virtual impactor (VI) sampler that concentrates coarse particles with an aerosol absorption photometer (Aethalometer, model AE33). The absorption of concentrated dust particles is obtained by subtracting the absorption of the submicron (PM1) aerosol fraction from the absorption of the virtual impactor sample (VIPM1 method). This real-time method for detecting desert dust was tested in the field for a period of 2 months (April and May 2016) at a regional background site of Cyprus, in the Eastern Mediterranean. Several intense desert mineral dust events were observed during the field campaign with dust concentration in PM10 up to 45 μgm
Najdeno v: ključnih besedah
Povzetek najdenega: ...lifetime; has adverse health effects; and affects air quality through the increase of regulatory PM10 concentrations, making...
Ključne besede: aerosol absorption, mineral dust, on-line detection, air quality
Objavljeno: 20.07.2020; Ogledov: 1325; Prenosov: 0
Polno besedilo (2,38 MB)

Opis: In this study, we measured the concentrations of specific heavy metals in the soil and sediment samples taken on different locations of the cities of Maribor (Slovenia), and Zenica (Bosnia and Herzegovina). The report also includes a questionnaire regarding the residents’ views about the environmental quality of the city they live in.
Najdeno v: ključnih besedah
Ključne besede: Soil, sediments, heavy metals, AAS, pollution, questionnaire, environmental quality.
Objavljeno: 11.09.2020; Ogledov: 1343; Prenosov: 0
Polno besedilo (10,44 MB)

Opis: Data Quality has become the base for any analytical operation or modelling. Poor Quality of data can lead to poor analytical modeling, which in turn can lead to poor decision making and predictions, which can finally impact the revenue and working of an organization. This is true for both public and private sector organizations. With rise in E-Governance, lot of nations and their respective public sector units are making use of publicly available datasets. But are these datasets reliable and have good quality. This is the major research question studied in this paper. The study collected publicly available datasets from Open Government Data platforms across 8 different nations around the world. More than 300 datasets having roughly 3.5 million rows were assessed for various data quality measures. The various parameters studied for the data were valid data types, correctness, completeness, statistical features, variability, comparability, duplicacy and the likes. Script was written in R to check the value for various measures. It was found that different countries had advantages on different parameters. Not one country was found to have all the parameters to be of high quality. Different ranges were found for the dataset for various parameters which was helpful in determining the overall quality of the dataset. This will be helpful for various public and private sector organizations in assessing the quality of datasets they intend to work on. Substantial efforts and resources can be saved on Advanced Analytics if the quality of dataset can be determined in advance. The proposed data quality assessment model can be applied on any private or public dataset. Different industry and organizations can set different threshold values for the parameters to benchmark their analytical process. Both practitioners and researchers can be benefitted from this research work.
Najdeno v: ključnih besedah
Ključne besede: data quality assessment, open government datasets, e-governance, data quality measures
Objavljeno: 05.04.2021; Ogledov: 852; Prenosov: 0
Polno besedilo (10,22 MB)
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Najdeno v: ključnih besedah
Ključne besede: protein quality, protein aggregation, data reproducibility
Objavljeno: 17.05.2021; Ogledov: 856; Prenosov: 5
Polno besedilo (0,00 KB)
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Najdeno v: ključnih besedah
Ključne besede: mineral dust, concentration, aerosols, air quality
Objavljeno: 17.11.2021; Ogledov: 448; Prenosov: 1
Polno besedilo (49,11 MB)
Gradivo ima več datotek! Več...