Search results

1

Reagents Activity in a Copper Droplets / Post-Processing Slag Suspension

100%

Najman K., Wołczyński W., Bydałek A. W., Karwan-Baczewska J.

Archives of Foundry Engineering

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2016

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issue 3

2

The morphological and dispersive characterization of commercial titanium dioxides

86%

Jesionowski T., Siwińska-Stefańska K., Krysztafkiewicz A., Sójka-Ledakowicz J., Koprowska J., Lewartowska J.

Polish Journal of Chemical Technology

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2007

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vol. 9

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issue 4

28-35

EN

The physicochemical and dispersive characterizations were conducted on the selected commercial titanium dioxides produced by, Z. Ch. POLICE, S. A. The dispersive properties were defined in detail by an analysis of particle size distribution and polydispersity index. Moreover, the microscope studies were executed to evaluate the surface morphology of the studied TiO2 forms. The profiles of titanium dioxides sedimentation in water were determined and the specific surface areas were defined by the BET method.

3

Evaluation of colloidal silica obtained via the co-precipitation method using octane as an organic phase

86%

Jesionowski T., Tepper B., Krysztafkiewicz A.

Polish Journal of Chemical Technology

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2007

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vol. 9

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issue 4

1-4

EN

The studies were conducted on the production of silica from emulsion systems by co-precipitation from solutions of sodium metasilicate and hydrochloric acid and octane were used as an organic medium. The obtained products were subjected to a comprehensive physicochemical analysis in order to define their dispersive and morphological properties. Particle diameters and polydispersity were determined by the NIBS (non-invasive back scattering) method while the shape and morphology of the particles were established using scanning electron microscopy (SEM). In order to determine the adsorptive properties of the obtained monodisperse silicas, isotherms of nitrogen adsorption/desorption on their surfaces were determined. Using the isotherms, also the specific surface area, the diameter and the volume of the pores were established. In order to define the hydrophilic/hydrophobic character of the products, profiles of wettability and of sedimentation in water were examined. The obtained products were well wettable with water and an increase in their weight depended on the amount of the applied surfactants. The particles of the precipitated silicas manifested a defined, spherical shape and showed a relatively low polydispersity.

4

Modelling erosion and sedimentation in a small watershed, East Java, Indonesia

86%

Sujarwo M. W., Indarto I., Mandala M., Sujarwo M. W., Indarto I., Mandala M.

Journal of Water and Land Development

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2021

|

issue 50

5

Mechanisms of Aerosol Sedimentation by Acoustic Field

86%

Kudryashova O., Antonnikova A., Korovina N., Akhmadeev I.

Archives of Acoustics

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2015

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vol. 40

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issue 4

6

Experimental study on sedimentation removal of pervious concrete

86%

Rama M., Shanthi V. M., Rama M., Shanthi V. M.

Archives of Civil Engineering

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2018

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vol. 64

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issue 1

7

Sedimentation of a Fine Aerosol in the Acoustic Fieldand with the Electrostatic Charge of Particles

86%

Stepkina M. Y., Kudryashova O. B., Antonnikova A. A.

Archives of Acoustics

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2018

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vol. 43

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issue 1

8

Spatial Modeling of Coastline Change for Two Decades (1994-2014) in Pangandaran, West Java - Indonesia

86%

Harahap S. A., Nurruhwati I., Purba N. P., Gamma M.

World News of Natural Sciences

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2022

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vol. 41

1078-122

EN

Coastal areas are very vulnerable to various pressures, developments, and changes. In the last three decades, due to the process of abrasion and accretion, there have been changes in coastlines in various coastal areas in Indonesia. Coastal abrasion and accretion are major concerns in coastal management. Morphological changes have had a major impact on land use and the socio-economic development of communities in coastal areas. In connection with this issue, it is necessary to conduct a study that aims to determine the rate and location of coastline changes in Pangandaran Regency. Considering that Pangandaran Regency is one of the southern regions of Java which is directly facing the Indian Ocean it has high coastal dynamics. In addition, Pangandaran beach is a beach tourism destination that is quite well known and has the potential to be developed, but in some locations, there are indications of a significant decline in the coastline. In this study, Landsat satellite images in time series (1994-2014) were analyzed using remote sensing technology and GIS approaches. Analysis of coastline change was carried out using the DSAS program. The results of the study show that the coastline change in Pangandran is dominated by abrasion at a rate of about -2.5 to -0.1 meters/year. The rate of change of the Pangandaran coastline which experienced the highest abrasion was -4.7 meters/year and the lowest was -0.1 meters/year, while the highest accretion rate was 40.1 meters/year and the lowest was 0.1 meters/year. Maximum abrasion is located at Sukaresik village (Sidamulih Sub-district) at the mouth of the Karang Tirta River. The minimum abrasion is located at Pananjung village. Meanwhile, accretion occurred in several villages such as Pananjung Village, Wonoharjo Village (Pangandaran Sub-district), Balogo Village (Kalipucang Sub-district), Kerta Mukti Village (Cimerak Sub-district), and Cikambulan Village (Sidamulih Sub-district). Minimum accretion is located at Pananjung village and maximum accretion is located at Bagolo village near the estuary of Citanduy River.

9

Assessment of sand accumulation in the gastrointestinal tract and its excretion with stool in silesian foals

86%

Siwińska N., Łuczka A., Żak A., Słowikowska M., Niedźwiedź A., Siwińska N., Łuczka A., Żak A., Słowikowska M., Niedźwiedź A.

Polish Journal of Veterinary Sciences

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2019

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issue 2

10

The Development of Freshwater Deltas and their Environmental and Economic Significance / Rozwój I Znaczenie Środowiskowo-Użytkowe Delt W Zbiornikach Śródlądowych

72%

Rzętała M. A., Jaguś A., Machowski R., Rzętała M.

Ecological Chemistry and Engineering S

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2015

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vol. 22

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issue 1

107-123

EN

The article presents the results of studies concerning the delta forms that arise as a result of the sedimentation of the debris fed to water bodies by watercourses. The study covered several dozen anthropogenic water bodies in the Upper Silesia region, which is well known for its high degree of urbanisation and industrialisation. Basic research work included morphometric measurements of deltas, analyses of the mechanical and chemical composition of delta sediments and analyses of the chemical composition of the common reed growing on the deltas. The research has demonstrated that the deltas exhibit certain characteristics typical of anthropogenic forms that result from the pollutants found in watercourses. In delta sediments, grains of sand usually dominate, but in many cases the share of the < 0.02 mm fraction is as high as ca. 30%. Sediments often contain fine coal and other organic pollutants, which is reflected by high weight loss on ignition. The content of trace elements in delta sediments is usually many times higher than the geochemical background for all types of sedimentary rocks. Deltas are an environment where pollutants accumulate and some of them are assimilated by plants. The content of macro elements in common reed tissues from different deltas does not vary widely while the content of trace elements often results from their content in the sediments. The material that forms deltas can be extracted and in some cases even used as fuel

PL

Przedstawiono wyniki badań form deltowych, powstających w wyniku sedymentacji rumowiska wnoszonego przez cieki do zbiorników wodnych. Badaniami objęto kilkadziesiąt zbiorników antropogenicznych w regionie górnośląskim, wyróżniającym się silną urbanizacją i uprzemysłowieniem. Podstawowe prace badawcze obejmowały: pomiary morfometryczne delt, analizy składu mechanicznego oraz chemicznego osadów deltowych, analizy składu chemicznego trzciny porastającej delty. Prace badawcze wykazały, że delty mają cechy form antropogenicznych, wynikające z zanieczyszczenia cieków. W osadach delt dominują zwykle ziarna piasku, lecz w wielu przypadkach frakcja < 0,02 mm stanowi nawet około 30%. Osady nierzadko zawierają miał węglowy i inne zanieczyszczenia organiczne, co wyrażają wysokie wartości strat wagowych po prażeniu. Zawartość pierwiastków śladowych w osadach deltowych najczęściej wielokrotnie przekracza tło geochemiczne wszystkich rodzajów skał osadowych. Delty są środowiskiem akumulacji zanieczyszczeń. Część z nich jest asymilowana przez roślinność. Zawartość makropierwiastków w tkankach trzciny z różnych delt jest mało zróżnicowana, natomiast zawartość mikropierwiastków często jest pochodną zawartości w materiale osadowym. Materiał tworzący delty może być wydobywany - w niektórych przypadkach posiada nawet cechy opałowe

Refine search results

Reagents Activity in a Copper Droplets / Post-Processing Slag Suspension

The morphological and dispersive characterization of commercial titanium dioxides

Evaluation of colloidal silica obtained via the co-precipitation method using octane as an organic phase

Modelling erosion and sedimentation in a small watershed, East Java, Indonesia

Mechanisms of Aerosol Sedimentation by Acoustic Field

Experimental study on sedimentation removal of pervious concrete

Sedimentation of a Fine Aerosol in the Acoustic Fieldand with the Electrostatic Charge of Particles

Spatial Modeling of Coastline Change for Two Decades (1994-2014) in Pangandaran, West Java - Indonesia

Assessment of sand accumulation in the gastrointestinal tract and its excretion with stool in silesian foals

The Development of Freshwater Deltas and their Environmental and Economic Significance / Rozwój I Znaczenie Środowiskowo-Użytkowe Delt W Zbiornikach Śródlądowych