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Nanoscience and Nanotechnology Commons™
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- Keyword
-
- Atmospheric Pollution (1)
- Biphenyl (1)
- Brønsted acidity (1)
- Dibenzoylation (1)
- Environmental Engineering (1)
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- Forest Fires (1)
- Fume formation rate (1)
- Fume particle composition (1)
- Fume particle size (1)
- Heterogeneous catalysis (1)
- Indoor air quality (1)
- Leaching ; Slags ; Steel Production (1)
- Metal transfer modes (1)
- Portugal (1)
- Shielding gas mixtures (1)
- Sulphated AlMCM-41 (1)
- Uncertainity ; Gaseous Emissions ; NOx (1)
- Publication
Articles 1 - 5 of 5
Full-Text Articles in Nanoscience and Nanotechnology
Forest Fires In Portugal: How They Happen And Why They Happen, João F. Gomes
Forest Fires In Portugal: How They Happen And Why They Happen, João F. Gomes
João F Gomes
Forest fires are recurrent phenomena in Southern European countries, due to the nature of Mediterranean forest and climatic characteristics. However, in Portugal, in the last years, forest fires attained the dimension of public calamity and are now endangering sustainability of forest itself, as well as several derived economic activities. This paper reviews the past and current situation of forest fires in Portugal, analyses its main causes and consequences and derives recommendations to effectively overcome this problem.
Leaching Of Heavy Metals From Steelmaking Slags, João F. Gomes
Leaching Of Heavy Metals From Steelmaking Slags, João F. Gomes
João F Gomes
Leaching tests with EAF and Ladle slags were performed, using a flow through test and the standard batch test DIN 38414-S4. The previous method was used to simulate the leaching behaviour of steel slags under landfill. The chemical analysis of the leachates during this period shows, in general, for both types of slag, an increase of heavy metal releases with ageing. Standard test method DIN 38414-S4 was used to evaluate leachability of heavy metals by water in unprocessed slags. After more than one year of trials, slag samples submitted to these trials presented very low total leaching levels. The most …
Estimation Of Uncertainty In The Determination Of Nitrogen Oxides Emissions, João F. Gomes
Estimation Of Uncertainty In The Determination Of Nitrogen Oxides Emissions, João F. Gomes
João F Gomes
This paper presents a methodology for estimation of uncertainty on a reference test method for determination of nitrogen oxides concentration in gaseous emissions from stationary sources. As a first stage for identification of uncertainty sources, the test method is carefully reviewed in detail. Afterwards, these sources are quantified, bearing in mind its partial uncertainty, allowing the determination of the combined uncertainty and, finally, the expanded uncertainty. The calculation procedure was implemented into an excel calculation file. Using this file and considering several numerical applications from real situations, uncertainities around 15 mg/Nm3 over determined concentrations of 350 mg/Nm3 of NOx (expressed …
Fume Emissions During Metal Arc Welding, João F. Gomes
Fume Emissions During Metal Arc Welding, João F. Gomes
João F Gomes
No abstract provided.
Sulphated Almcm-41: Mesoporous Solid Brønsted Acid Catalyst For Dibenzoylation Of Biphenyl, Eng-Poh Ng, Hadi Nur, Mohd Nazlan Mohd Muhid, Halimaton Hamdan
Sulphated Almcm-41: Mesoporous Solid Brønsted Acid Catalyst For Dibenzoylation Of Biphenyl, Eng-Poh Ng, Hadi Nur, Mohd Nazlan Mohd Muhid, Halimaton Hamdan
Eng-Poh Ng
Sulphated mesoporous solid Brønsted acid catalyst (SO4-AlMCM-41) was prepared by impregnation of sulphuric acid on the surface of H-AlMCM-41. Characterization of SO4-AlMCM-41 by pyridine adsorption studies and 27Al MAS NMR showed that the presence of Brønsted acidity was correlated with octahedrally coordinated aluminium and solvent environment. Catalytic study demonstrated that the SO4-AlMCM-41 catalyst has a higher activity in the dibenzoylation of biphenyl with benzoyl chloride than sulphuric acid, H-AlMCM-41 and sulphated amorphous silica.