Records |
Author |
Gielis, J.; Caratelli, D.; Fougerolle, Y.; Ricci, P.E.; Gerats, T. |
Title |
A biogeometrical model for corolla fusion in Asclepiad flowers |
Type |
H1 Book chapter |
Year |
2017 |
Publication |
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Abbreviated Journal |
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Volume |
2 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
83-105
T2 - Modeling in mathematics : proceedings |
Keywords |
H1 Book chapter; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
The molecular genetics of flower development have been studied extensively for more than two decades. Fusion of organs and the tendency to oligomery, important characteristics of flower evolution, so far have remained fairly elusive. We present a geometric model for shape and fusion in the corolla of Asclepiads. Examples demonstrate how fusion of petals creates stable centers, a prerequisite for the formation of complex pollination structures via congenital and postgenital fusion events, with the formation of de novo organs, specific to Asclepiads. The development of the corolla reduces to simple inequalities from the MATHS-BOX. The formation of stable centers and of bell and tubular shapes in flowers are immediate and logical consequences of the shape. Our model shows that any study on flowers, especially in evo-devo perspective should be performed within the wider framework of polymery and oligomery and of fusion and synorganization. |
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000442076400007 |
Publication Date |
2017-04-20 |
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ISBN |
978-94-6239-260-1; 978-94-6239-261-8; 2543-0300; 978-94-6239-260-1 |
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UA library record; WoS full record; WoS citing articles |
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no |
Call Number |
UA @ admin @ c:irua:144551 |
Serial |
7561 |
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Author |
Xie, Y. |
Title |
Bioreactor strategies for sustainable nitrogen cycling based on mineralization/nitrification, partial nitritation/anammox or sulfur-based denitratation |
Type |
Doctoral thesis |
Year |
2021 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
iv, 205 p. |
Keywords |
Doctoral thesis; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
In the biogeochemical flows on Earth, the reactive nitrogen (Nr) level has three times surpassed the safe boundary. The severe transgression of this boundary goes against sustainable planetary development. The modern food production process excessively relies on synthetic Nr fertilizers from the Haber– Bosch process. However, the massive loss of valuable nitrogen resources (i.e., 78-89%) from agriculture has been causing severe nitrogen cascade. Besides, the domestic wastewater in some local areas is discharged without proper treatment, making it a nonnegligible source of Nr pollution for local water bodies. Anthropogenic activities keep pumping out Nr pollution via point-source and non-point-source (NPS) emissions. Compared to the NPS emissions, point sources give visible and identified waste streams. It is vital to intervene the nitrogen cascade from point sources and facilitate humanity back to the safe Nr boundary. The collected and collectible Nr streams from food production, waste management, and recycling secondary raw materials can be used as waste-based fertilizers for agricultural cultivation. Besides the well-investigated recovery of inorganic Nr, organic Nr accounts for a massive Nr proportion on the Earth. Proper handling and treatment make these useful organic fertilizers for soil-based cultivation. However, these organic Nr fertilizers cannot directly apply to fertigation or hydroponic cultivation systems, and further biological conversion via nitrogen mineralization and nitrification to nitrate is essential. Besides the direct Nr cycling, the indirect Nr cycling ‘over the atmosphere’ should also be considered. In this way, the nitrogen cycle can be completed via converting the waste Nr back to nitrogen gas (i.e., Nr removal) and then synthesizing into Nr again. The municipal wastewater treatment plants receive a vast amount of low-strength Nr wastewater (mainly as ammonium) daily. Compared to the conventional nitrification/denitrification process, partial nitritation/anammox (PN/A) is considered a resource- and cost-effective technology for wastewater with a low COD/N ratio. Moreover, the novel autotrophic denitratation/anammox process could be a good Nr removal process for wastewater containing both ammonium and nitrate. This Ph.D. thesis aimed to develop Nr recovery, conversion, and removal bioreactor strategies for different types of waste streams and biomass. Nr recovery was investigated on high-strength Nr waste streams for fertigation or hydroponic applications in Chapters 2 and 3. On the other hand, Nr removal was studied on the medium- to low-strength Nr waste streams in Chapters 4 and 5. In Chapter 2, a novel mineralization and nitrification system was proposed, producing nutrient solutions from solid organic fertilizers for hydroponic systems. Batch tests showed that aerobic incubation at 35°C could realize the NO₃⁻-N production efficiency above 90% from a novel microbial fertilizer. Subsequently, in the stirred tank bioreactor test, NO₃⁻-N production efficiency stabilized in a range of 44-51% under the influent loading rate of 400 mg TN L⁻¹ d⁻¹ at a 5-day HRT. Using Ca(OH)₂ and Mg(OH)₂ as pH control reagents generated the nutrient solutions with different P, Ca, and Mg nutrient levels. After modeling the nutrient balancing process, the proportion of organic-sourced NO₃⁻-N in the Hoagland nutrient solution (HNS) of Ca(OH)₂ scenario was 92.7%, while only 37.4% in the Mg(OH)₂ scenario. Compared to commercial scenarios, the total costs of the organic-sourced HNS can be cost-competitive for hydroponic cultivation. In Chapter 3, the Nr recovery as nitrate (NO₃⁻-N) from diluted human urine (around 670 mg N L⁻¹) was explored in a trickling filter (TF) for the first time. A novel concept of in-situ integrating the TF system into hydroponic systems was proposed as meaningful progress towards sustainable agriculture. The difference between synthetic and real urine in nitrification efficiency was found to be negligible. The full nitrification of alkalinized real urine was realized in the pH-controlled TF by calcium hydroxide (Ca(OH)₂) at around pH 6. The TF could handle different urine collection batches and maintain relatively stable nitrification performance, with NO₃⁻-N production efficiency and rate of 88±3% and 136±4 mg N L⁻¹ d⁻¹, respectively. The optimal HLR to realize this nitrification performance was 2 m³ m⁻² h⁻¹, with energy consumption of 1.8 kWh electricity kg⁻¹ NO₃⁻-N production. Ca(OH)₂, as a cheap base, its triple advantages on urine alkalinization, full nitrification, and macronutrient supplementation were successfully demonstrated in our proposed concept. In Chapter 4, towards more sustainable wastewater treatment, the feasibility of one-stage partial nitritation/anammox (PN/A) was investigated in three parallel packed-bed trickling filters (TFs), with three types of carrier materials of different specific surface areas. Synthetic wastewater containing 100-250 mg NH₄⁺-N L⁻¹ was tested to mimic medium-strength household waste streams after carbon removal. Interestingly, the cheap carrier based on expanded clay achieved similar rates as commercially used plastic carrier materials. The top passive ventilation combined with an optimum hydraulic loading rate of 1.8 m³ m⁻² h⁻¹ could reach approximately 60% total nitrogen (TN) removal at a rate of 300 mg N L⁻¹ d⁻¹. A relatively low NO₃⁻-N production (13%) via PN/A was achieved in TFs. Most of the TN removal took place in the top compartment, where anammox activity was the highest. Energy consumption estimation (0.78 kWh electricity g⁻¹ N removed) suggested that the proposed process could be a suitable low-cost alternative for nitrogen removal. In Chapter 5, coupling sulfur-driven denitratation (SDN) with anammox was proposed to treat the wastewater containing both NO₃⁻-N and NH₄⁺-N, like the secondary effluents of mainstream PN/A processes. To explore the feasibility of sufficient and stable NO₂⁻-N accumulation via SDN in the long term, the effects of pH setpoints, residual NO₃⁻-N level, and biomass-specific NO₃⁻-N loading rate (BSNLR) were investigated. Alternating the pH setpoints between 7.0 and 8.5 could temporarily stimulate the NO₂⁻-N accumulation. Both the residual NO₃⁻-N and BSNLR showed highly positive correlations with the NO₂⁻-N accumulation efficiency. Under the control of pH 8.5, 1.0±0.8 mg NO₃⁻-N L⁻¹ and 150±42 mg NO₃⁻-N g⁻¹ VSS d⁻¹, SDN could produce 6.4±1.0 mg NO₂⁻-N L⁻¹ in the short term. Thiobacillus members may play a crucial role in managing the NO₂⁻-N accumulation, but the reduction of abundance and possible adaptation significantly impaired the efficacy of control strategies in the long run. Overall, novel technologies have been proposed to sustainably convert Nr in waste streams and biomass. The decision for Nr recovery versus removal and synthesis should be based on specific cases with the best environmental, economic, and human-health sustainability. In the future, the Nr management concepts should be further improved to make the nitrogen cycle more sustainable with higher resource use efficiency and less Nr emissions to the environment. Although the thesis is mainly focused on limited types of Nr waste streams, it pointed out the direction of sustainable Nr management and could facilitate the Nr back to the safe boundary in the long run. |
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Most recent IF: NA |
Call Number |
UA @ admin @ c:irua:182099 |
Serial |
7563 |
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Author |
Van Eynde, E. |
Title |
Biotemplate silica-titania diatoms for gas phase photocatalysis |
Type |
Doctoral thesis |
Year |
2015 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
184 p. |
Keywords |
Doctoral thesis; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
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ISBN |
978-90-5728-500-4 |
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UA library record |
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no |
Call Number |
UA @ admin @ c:irua:130503 |
Serial |
7564 |
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Author |
Tang, T.; Strokal, M.; van Vliet, M.T.H.; Seuntjens, P.; Burek, P.; Kroeze, C.; Langan, S.; Wada, Y. |
Title |
Bridging global, basin and local-scale water quality modeling towards enhancing water quality management worldwide |
Type |
A1 Journal article |
Year |
2019 |
Publication |
Current Opinion in Environmental Sustainability |
Abbreviated Journal |
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Volume |
36 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
39-48 |
Keywords |
A1 Journal article; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
Global water quality (WQ) modeling is an emerging field. In this article, we identify the missing linkages between global and basin/local-scale WQ models, and discuss the possibilities to fill these gaps. We argue that WQ models need stronger linkages across spatial scales. This would help to identify effective scale-specific WQ management options and contribute to future development of global WQ models. Two directions are proposed to improve the linkages: nested multiscale WQ modeling towards enhanced water management, and development of next-generation global WQ models based-on basin/local-scale mechanistic understanding. We highlight the need for better collaboration among WQ modelers and policy-makers in order to deliver responsive water policies and management strategies across scales. |
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000460234600006 |
Publication Date |
2018-11-07 |
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ISSN |
1877-3435 |
ISBN |
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UA library record; WoS full record; WoS citing articles |
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no |
Call Number |
UA @ admin @ c:irua:158643 |
Serial |
7568 |
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Author |
Gielis, J.; Caratelli, D.; Tavkelidze, I.; Fougerolle, Y.; Ricci, P.E.; Gerats, T. |
Title |
Bulky knots and links generated by cutting generalized Mobius-Listing bodies and applications in the natural sciences |
Type |
H2 Book chapter |
Year |
2013 |
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Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
167-183
T2 - Math Art Summit : Koninklijke Vlaamse |
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H2 Book chapter; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
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ISBN |
978-90-6569-119-4 |
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UA library record |
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no |
Call Number |
UA @ admin @ c:irua:110955 |
Serial |
7569 |
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Author |
Caen, J.; Schalm, O.; Janssens, K. |
Title |
Caractérisation historique et chimique des peintures en grisaille et du verre de vitrail dans l'oeuvre de J.-B. Capronnier (1814 – 1891) et J.-B. Bethune (1821 – 1894) |
Type |
P3 Proceeding |
Year |
2000 |
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Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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P3 Proceeding; Art; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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no |
Call Number |
UA @ admin @ c:irua:112007 |
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7576 |
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Author |
Godoi, R.H.M.; Bittencourt, A.V.L.; Hirata, P.Y.; Jafelicci Junior, M.; dos Reis Neto, J.M.; de Souza Sarkis, J.E.; Zara, L.F.; Van Grieken, R. |
Title |
Caracterização dos sistemas iônicos e particulado no reservatório |
Type |
H3 Book chapter |
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2011 |
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Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
170-188
T2 - Eutrofização em reservatórios : gestã |
Keywords |
H3 Book chapter; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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978-85-7335-286-3 |
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no |
Call Number |
UA @ admin @ c:irua:97170 |
Serial |
7577 |
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Author |
Tiwari, S.; Van de Put, M.L.; Sorée, B.; Vandenberghe, W.G. |
Title |
Carrier transport in a two-dimensional topological insulator nanoribbon in the presence of vacancy defects |
Type |
P1 Proceeding |
Year |
2018 |
Publication |
International Conference on Simulation of Semiconductor Processes and Devices : [proceedings]
T2 – International Conference on Simulation of Semiconductor Processes and, Devices (SISPAD), SEP 24-26, 2018, Austin, TX |
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92-96 |
Keywords |
P1 Proceeding; Engineering sciences. Technology; Condensed Matter Theory (CMT) |
Abstract |
We model transport through two-dimensional topological insulator (TI) nanoribbons. To model the quantum transport, we employ the non-equilibrium Green's function approach. With the presented approach, we study the effect of lattice imperfections on the carrier transport. We observe that the topologically protected edge states of TIs are robust against a high percentage (2%) of vacancy defects. We also investigate tunneling of the edge states in two decoupled TI nanoribbons. |
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000516619300024 |
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2018-12-08 |
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978-1-5386-6790-3; 1946-1577; 978-1-5386-6791-0 |
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UA library record; WoS full record; WoS citing articles |
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no |
Call Number |
UA @ admin @ c:irua:181281 |
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7579 |
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Author |
Potgieter, J.H.; Godoi, R.H.M.; Van Grieken, R. |
Title |
A case study of high-temperature corrosion in rotary cement kilns |
Type |
A1 Journal article |
Year |
2004 |
Publication |
Journal of the South African Institute of Mining and Metallurgy |
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104 |
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603-606 |
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A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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000226560900008 |
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0038-223x |
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UA library record; WoS full record; WoS citing articles |
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UA @ admin @ c:irua:50187 |
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7581 |
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Noone, K.J.; Johnson, D.W.; Taylor, J.P.; Ferek, R.J.; Garrett, T.; Hobbs, P.V.; Durkee, P.A.; Nielsen, K.; Öström, E.; O'Dowd, C.D.; Smith, M.H.; Russell, L.M.; Flagan, R.C.; Seinfeld, J.H.; de Bock, L.; Van Grieken, R.E.; Hudson, J.G.; Brooks, I.; Gasparovic, R.F.; Pockalny, R.A. |
Title |
A case study of ship track formation in a polluted marine boundary layer |
Type |
A1 Journal article |
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2000 |
Publication |
Journal of the atmospheric sciences |
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Volume |
57 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
2748-2764 |
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A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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000088911800016 |
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2002-07-27 |
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0022-4928; 1520-0469 |
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UA library record; WoS full record; WoS citing articles |
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Call Number |
UA @ admin @ c:irua:31631 |
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7582 |
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Noone, K.J.; Öström, E.; Ferek, R.J.; Garrett, T.; Hobbs, P.V.; Johnson, D.W.; Taylor, J.P.; Russell, L.M.; Flagan, R.C.; Seinfeld, J.H.; O'Dowd, C.D.; Smith, M.H.; Durkee, P.A.; Nielsen, K.; Hudson, J.G.; Pockalny, R.A.; de Bock, L.; Van Grieken, R.E.; Gasparovic, R.F.; Brooks, I. |
Title |
A case study of ships forming and not forming tracks in moderately polluted clouds |
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A1 Journal article |
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2000 |
Publication |
Journal of the atmospheric sciences |
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57 |
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2729-2747 |
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A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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000088911800015 |
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2002-07-27 |
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0022-4928; 1520-0469 |
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UA library record; WoS full record; WoS citing articles |
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Call Number |
UA @ admin @ c:irua:31624 |
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7583 |
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Author |
Sóti, V. |
Title |
Catalytic detoxification of lignocellulose hydrolyzate |
Type |
Doctoral thesis |
Year |
2019 |
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Pages |
XXVII, 243 p. |
Keywords |
Doctoral thesis; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL); Biochemical Wastewater Valorization & Engineering (BioWaVE) |
Abstract |
The present PhD research investigated the possibility of catalytic detoxification of poplar wood based and steam exploded lignocellulosic hydrolyzate with different types of laccase enzymes, with special focus on ethanol and lactic acid products at industrially relevant parameters: high final product concentration, high initial substrate loading and integrated processes. The simultaneous saccharification and fermentation (SSF) process was taken as a base case and five types of laccases were thoroughly investigated on their utilization potential. Phenolic removal from the liquid xylose rich fraction (XRF) was higher with fungal laccases (65-90 %) compared to approximately 30 % removal with bacterial laccase. Moreover, the optimal pH of fungal laccases was close to pH 4.5, the optimum for cellulase, while the bacterial laccase worked at basic pH. Integrating laccase treatment and hydrolysis together showed that fungal laccases have negative impact on final sugar concentration, while bacterial laccase had a strong positive effect. Although bacterial laccase removed less phenol and although its optimal conditions are difficult to integrate with hydrolysis, its enhancing effect on cellulase activity makes it a better candidate for application. The presence of the solid fraction (SF) alters the phenolic concentration evolution significantly, thus screening experiments with the liquid fraction alone do not provide sufficient information for the combined process. Magnetic Cross-Linked Enzyme Aggregates (m-CLEAs) immobilization was assessed for bacterial laccase. m-CLEAs decreased phenolic concentration faster at every pH compared to free bacterial laccase; however, the removal was caused by adsorption rather than by enzyme activity. Although the size of m-CLEAs particles are in the µm range, around 90 % of the initial catalyst mass was recycled from a dense (15 % substrate loading) mixture via magnetic separation. The high recycling rate is promising; m-CLEAs immobilization method can have industrial utilization potential. Minimum sugar revenue (MSR) estimations show that currently hardwood based MSR is 70 % more expensive than corn grain based MSR. About 7-10 fold cellulase activity increase will be needed until MSR will be competitive with corn grain MSR. However, m-CLEAs cellulase can already be competitive if the corn prices are in the higher regime of last year’s prices. |
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no |
Call Number |
UA @ admin @ c:irua:180125 |
Serial |
7584 |
Permanent link to this record |
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|
|
Author |
Torfs, K.; Van Grieken, R.; Zezza, F.; Garcia, N.; Macri, F. |
Title |
The cathedral of Bari, Italy: evaluation of environmental effects on stone decay phenomena |
Type |
A1 Journal article |
Year |
1997 |
Publication |
Studies in conservation = Études de conservation |
Abbreviated Journal |
|
Volume |
42 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
193-206 |
Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
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Corporate Author |
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Thesis |
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Place of Publication |
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Wos |
000071198200001 |
Publication Date |
2006-04-23 |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
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ISBN |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
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Times cited |
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Open Access |
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Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:18785 |
Serial |
7585 |
Permanent link to this record |
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Author |
Roefs, I.; Meulman, B.; Vreeburg, J.H.G.; Spiller, M. |
Title |
Centralised, decentralised or hybrid sanitation systems? Economic evaluation under urban development uncertainty and phased expansion |
Type |
A1 Journal article |
Year |
2017 |
Publication |
Water research |
Abbreviated Journal |
|
Volume |
109 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
274-286 |
Keywords |
A1 Journal article; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
Sanitation systems are built to be robust, that is, they are dimensioned to cope with population growth and other variability that occurs throughout their lifetime. It was recently shown that building sanitation systems in phases is more cost effective than one robust design. This phasing can take place by building small autonomous decentralised units that operate closer to the actual demand. Research has shown that variability and uncertainty in urban development does affect the cost effectiveness of this approach. Previous studies do not, however, consider the entire sanitation system from collection to treatment. The aim of this study is to assess the economic performance of three sanitation systems with different scales and systems characteristics under a variety of urban development pathways. Three systems are studied: (I) a centralised conventional activated sludge treatment, (II) a community on site source separation grey water and black water treatment and (III) a hybrid with grey water treatment at neighbourhood scale and black water treatment off site. A modelling approach is taken that combines a simulation of greenfield urban growth, a model of the wastewater collection and treatment infrastructure design properties and a model that translates design parameters into discounted asset lifetime costs. Monte Carlo simulations are used to evaluate the economic performance under uncertain development trends. Results show that the conventional system outperforms both of the other systems when total discounted lifetime costs are assessed, because it benefits from economies of scale. However, when population growth is lower than expected, the source-separated system is more cost effective, because of reduced idle capacity. The hybrid system is not competitive under any circumstance due to the costly double piping and treatment. (C) 2016 Elsevier Ltd. All rights reserved. |
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
000392788900028 |
Publication Date |
2016-11-23 |
Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
|
Edition |
|
ISSN |
0043-1354; 1879-2448 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
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Times cited |
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Open Access |
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Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:143853 |
Serial |
7587 |
Permanent link to this record |
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Author |
Sleegers, N. |
Title |
Cephalosporin antibiotics : electrochemical fingerprints and redox pathways investigated by mass spectral analysis |
Type |
Doctoral thesis |
Year |
2021 |
Publication |
|
Abbreviated Journal |
|
Volume |
|
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
208 p. |
Keywords |
Doctoral thesis; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Antwerp Electrochemical and Analytical Sciences Lab (A-Sense Lab) |
Abstract |
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Address |
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Corporate Author |
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Place of Publication |
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Wos |
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Publication Date |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
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ISBN |
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Additional Links |
UA library record |
Impact Factor |
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Times cited |
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Open Access |
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Notes |
|
Approved |
Most recent IF: NA |
Call Number |
UA @ admin @ c:irua:181014 |
Serial |
7588 |
Permanent link to this record |
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|
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Author |
Roegiers, J.; van Walsem, J.; Denys, S. |
Title |
CFD- and radiation field modeling of a gas phase photocatalytic multi-tube reactor |
Type |
A1 Journal article |
Year |
2018 |
Publication |
Chemical engineering journal |
Abbreviated Journal |
|
Volume |
338 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
287-299 |
Keywords |
A1 Journal article; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
This paper focusses on the development of a Multiphysics model as a tool for assessing the performance of a multi-tube photoreactor. The model predicts the transient behavior of acetaldehyde concentration, as a model compound for the organic fraction of the indoor air pollutants, under varying sets of conditions. A 3D-model couples radiation field modeling with reaction kinetics and fluid dynamics in order to simulate the transport of the pollutant as it progresses through the reactor. A model-based approach is proposed to determine the layer thickness and refractive index of different P25-powder modified solgel coatings, using an optimization procedure to estimate these parameters based on UV-irradiance measurements. The radiation field model was able to accurately predict the irradiance on the catalytic surface within the reactor. Consequently, the radiation field model was used to define an irradiance dependent reaction rate constant in a coupled Multiphysics model. An optimization routine was deployed to estimate the adsorption, desorption- and photocatalytic reaction rate constants on the TiO2-surface, using experimentally determined, transient outlet concentrations of acetaldehyde. Additionally, a validation test was performed in an air-tight climate chamber at much higher flow rates, higher irradiance and realistic indoor pollutant concentrations to emphasize the reliability and accuracy of the parameters for adsorption, desorption and photocatalytic reaction. The developed model makes it possible to optimize the reactor design and scale-up for commercial applications. |
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
000427618400031 |
Publication Date |
2018-01-08 |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
1385-8947; 1873-3212 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
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Approved |
no |
Call Number |
UA @ admin @ c:irua:149115 |
Serial |
7589 |
Permanent link to this record |
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|
|
Author |
Roegiers, J.; Denys, S. |
Title |
CFD-modelling of activated carbon fibers for indoor air purification |
Type |
A1 Journal article |
Year |
2019 |
Publication |
Chemical engineering journal |
Abbreviated Journal |
|
Volume |
365 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
80-87 |
Keywords |
A1 Journal article; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
Activated carbon fibers for indoor air purification were investigated by means of pressure drop and adsorption capacity. The Darcy-Forchheimer law combined with Computational Fluid Dynamics (CFD) modelling was deployed to simulate the pressure drop over an activated carbon fiber (ACF) filter with varying filter thickness. The CFD model was later combined with adsorption modelling to simulate breakthrough profiles of acetaldehyde adsorption on the ACF-filter. The adsorption model incorporates mass transfer resistance and adsorption equilibrium. It assumes local equilibrium between gas phase and solid phase. The latter was investigated for three different adsorption isotherms: linear, Langmuir and Freundlich adsorption. Successful agreement between model simulations and experimental data was obtained, using the Freundlich adsorption model. The numerical model could provide valuable insights and allows to continuously improve the design of filtration devices. |
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
000459009800009 |
Publication Date |
2019-02-02 |
Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
|
Series Issue |
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Edition |
|
ISSN |
1385-8947; 1873-3212 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:156996 |
Serial |
7590 |
Permanent link to this record |
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|
Author |
de Miranda, R.M.; de Fátima Andrade, M.; Worobiec, A.; Van Grieken, R. |
Title |
Characterisation of aerosol particles in the São Paulo Metropolitan Area |
Type |
A1 Journal article |
Year |
2002 |
Publication |
Atmospheric environment : an international journal |
Abbreviated Journal |
|
Volume |
36 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
345-352 |
Keywords |
A1 Journal article; Laboratory Experimental Medicine and Pediatrics (LEMP); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
000173667400017 |
Publication Date |
2002-10-14 |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
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Series Volume |
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Series Issue |
|
Edition |
|
ISSN |
1352-2310 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:37781 |
Serial |
7591 |
Permanent link to this record |
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|
|
Author |
Kontozova, V.; Deutsch, F.; Godoi, R.; Godoi, A.F.; Joos, P.; Van Grieken, R. |
Title |
Characterisation of air pollutants in museum showcases |
Type |
P3 Proceeding |
Year |
2002 |
Publication |
|
Abbreviated Journal |
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Volume |
|
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
|
Keywords |
P3 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
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Publication Date |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
|
Edition |
|
ISSN |
|
ISBN |
|
Additional Links |
UA library record |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:39524 |
Serial |
7592 |
Permanent link to this record |
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|
Author |
Baken, S.; Sjostedt, C.; Gustafsson, J.P.; Seuntjens, P.; Desmet, N.; De Schutter, J.; Smolders, E. |
Title |
Characterisation of hydrous ferric oxides derived from iron-rich groundwaters and their contribution to the suspended sediment of streams |
Type |
A1 Journal article |
Year |
2013 |
Publication |
Applied geochemistry |
Abbreviated Journal |
|
Volume |
39 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
59-68 |
Keywords |
A1 Journal article; Sustainable Energy, Air and Water Technology (DuEL) |
Abstract |
When Fe(II) bearing groundwaters surface in streams, particulate authigenic Fe-rich material is produced by oxidation. Such freshly precipitated Fe minerals may be transported as suspended sediment and have a profound impact on the fate of trace metals and nutrients in rivers. The objective of this study was to monitor changes in mineralogy and composition of authigenic material from its source to streams of increasing order. Groundwaters, surface waters, and suspended sediment in streams of different order were sampled in the Kleine Nete catchment (Belgium), a lowland with Fe-rich groundwaters (3.5-53.8 mg Fe/L; pH 6.3-6.9). Fresh authigenic material (>0.45 mu m) was produced by oxidising filtered (<0.45 mu m) groundwater and surface water. This material contained, on average, 44% Fe, and smaller concentrations of C, P, and Ca. Iron EXAFS (Extended X-ray Absorption Fine Structure) spectroscopy showed that the Fe was present as poorly crystalline hydrous ferric oxides with a structure similar to that of ferrihydrite. The Fe concentration in the suspended sediment samples decreased to 36-40% (stream order 2), and further to 18-26% (stream order 4 and 5). Conversely, the concentrations of organic C, Ca, Si, and trace metals increased with increasing stream order, suggesting mixing of authigenic material with suspended sediment from a different source. The Fe speciation in the suspended sediment was similar to that in fresh authigenic material, but more Fe-Fe interactions were observed, i.e. it was increasingly hydrolysed, suggesting ageing reactions. The suspended sediment in the streams of order 4 and 5 is estimated to contain between 31% and 59% of authigenic material, but more data are needed to refine this estimate. The authigenic material is an important sink for P in these streams which may alleviate the eutrophication risk in this catchment. (C) 2013 Elsevier Ltd. All rights reserved. |
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Wos |
000327488700007 |
Publication Date |
2013-10-05 |
Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
|
ISSN |
0883-2927 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:112769 |
Serial |
7595 |
Permanent link to this record |
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|
|
Author |
Van Grieken, R.; Gysels, K.; Hoornaert, S.; Joos, P.; Osán, J.; Szalóki, I.; Worobiec, A. |
Title |
Characterisation of individual aerosol particles for atmospheric and cultural heritage studies |
Type |
A1 Journal article |
Year |
2000 |
Publication |
Water, air and soil pollution |
Abbreviated Journal |
|
Volume |
123 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
215-228 |
Keywords |
A1 Journal article; Laboratory Experimental Medicine and Pediatrics (LEMP); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
000089881000020 |
Publication Date |
2002-12-21 |
Series Editor |
|
Series Title |
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Abbreviated Series Title |
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Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
0049-6979; 1573-2932 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:31675 |
Serial |
7596 |
Permanent link to this record |
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|
Author |
Van Grieken, R.; Gysels, K.; Hoornaert, S.; Joos, P.; Osán, J.; Szalóki, I.; Worobiec, A. |
Title |
Characterisation of individual aerosol particles for atmospheric and cultural heritage studies |
Type |
H3 Book chapter |
Year |
2000 |
Publication |
|
Abbreviated Journal |
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Volume |
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Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
215-228
T2 - Environmental challenges / Belkin, Sh |
Keywords |
H3 Book chapter; Laboratory Experimental Medicine and Pediatrics (LEMP); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Language |
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Wos |
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Publication Date |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
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ISBN |
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Additional Links |
UA library record |
Impact Factor |
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Times cited |
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Open Access |
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Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:31694 |
Serial |
7597 |
Permanent link to this record |
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|
Author |
Worobiec, A.; Stefaniak, E.A.; Kontozova, V.; Samek, L.; Karaszkiewicz, P.; van Meel, K.; Van Grieken, R. |
Title |
Characterisation of individual atmospheric particles within the Royal Museum of the Wawel Castle in Cracow, Poland |
Type |
A1 Journal article |
Year |
2006 |
Publication |
e-Preservation Science |
Abbreviated Journal |
|
Volume |
3 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
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Pages |
63-68 |
Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Laboratory Experimental Medicine and Pediatrics (LEMP) |
Abstract |
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Corporate Author |
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Place of Publication |
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Wos |
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Publication Date |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
1854-3928 |
ISBN |
|
Additional Links |
UA library record |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:62283 |
Serial |
7598 |
Permanent link to this record |
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|
|
Author |
Bernard, P.C.; Van Grieken, R.E.; Eisma, D. |
Title |
Characterisation of individual suspension particles in the Ems estuary |
Type |
P3 Proceeding |
Year |
1986 |
Publication |
|
Abbreviated Journal |
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Volume |
|
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
|
Keywords |
P3 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
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Address |
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Corporate Author |
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Thesis |
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Publisher |
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Place of Publication |
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Editor |
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Wos |
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Publication Date |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
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ISBN |
|
Additional Links |
UA library record |
Impact Factor |
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Times cited |
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Open Access |
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Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:117514 |
Serial |
7599 |
Permanent link to this record |
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|
|
Author |
Gysels, K.; Deutsch, F.; Van Grieken, R. |
Title |
Characterisation of particulate matter in the Royal Museum of Fine Arts, Antwerp, Belgium |
Type |
A1 Journal article |
Year |
2002 |
Publication |
Atmospheric environment : an international journal |
Abbreviated Journal |
|
Volume |
36 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
4103-4113 |
Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
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Publisher |
|
Place of Publication |
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Editor |
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Language |
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Wos |
000178473100009 |
Publication Date |
2002-09-06 |
Series Editor |
|
Series Title |
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Abbreviated Series Title |
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Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
1352-2310 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
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Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:40620 |
Serial |
7600 |
Permanent link to this record |
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|
|
Author |
Godoi, R.H.M.; Godoi, A.F.L.; Worobiec, A.; Andrade, S.J.; de Hoog, J.; Santiago-Silva, M.R.; Van Grieken, R. |
Title |
Characterisation of sugar cane combustion particles in the Araraquara region, Southeast Brazil |
Type |
A1 Journal article |
Year |
2004 |
Publication |
Microchimica acta |
Abbreviated Journal |
|
Volume |
145 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
53-56 |
Keywords |
A1 Journal article; Laboratory Experimental Medicine and Pediatrics (LEMP); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
|
Publisher |
|
Place of Publication |
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Editor |
|
Language |
|
Wos |
000221453500009 |
Publication Date |
2004-04-21 |
Series Editor |
|
Series Title |
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Abbreviated Series Title |
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Series Volume |
|
Series Issue |
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Edition |
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ISSN |
|
ISBN |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
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Times cited |
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Open Access |
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Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:44333 |
Serial |
7602 |
Permanent link to this record |
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|
|
Author |
Osán, J.; Alföldy, B.; Török, S.; Van Grieken, R. |
Title |
Characterisation of wood combustion particles using electron probe microanalysis |
Type |
A1 Journal article |
Year |
2002 |
Publication |
Atmospheric environment : an international journal |
Abbreviated Journal |
|
Volume |
36 |
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
2207-2214 |
Keywords |
A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
Abstract |
|
Address |
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Corporate Author |
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Thesis |
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Publisher |
|
Place of Publication |
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Editor |
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Language |
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Wos |
000176306700012 |
Publication Date |
2002-10-11 |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
Series Volume |
|
Series Issue |
|
Edition |
|
ISSN |
1352-2310 |
ISBN |
|
Additional Links |
UA library record; WoS full record; WoS citing articles |
Impact Factor |
|
Times cited |
|
Open Access |
|
Notes |
|
Approved |
no |
Call Number |
UA @ admin @ c:irua:39520 |
Serial |
7604 |
Permanent link to this record |
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|
|
Author |
Zhang, L. |
Title |
Characteristic diagnosis of atmospheric discharge plasma and kinetics study of reactive species |
Type |
Doctoral thesis |
Year |
2021 |
Publication |
|
Abbreviated Journal |
|
Volume |
|
Issue ![sorted by Issue field, ascending order (up)](img/sort_asc.gif) |
|
Pages |
XVIII, 148 p. |
Keywords |
Doctoral thesis; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT) |
Abstract |
Low-temperature plasma has received extensive attention due to its promising application prospects in the field of air pollutants degradation and energy conversion. To fulfill the need for particular applications, constructing stable plasma sources and investigating the interaction mechanisms between plasma and substances have been hot research topics. This thesis reports the diagnosis and improvement of plasma sources, diagnosis of the active species in plasma and a modeling study of chemical kinetics processes. The main research contents are as follows: In Chapter 3, a diffuse sine AC dielectric barrier discharge (DBD) is successfully obtained by optimizing the electrode structure. It is found that using double-layer dielectric plates can limit the discharge current intensity and significantly improve the discharge uniformity. The electrical characteristics and gas temperature with different operating time show that the discharge stability is also improved by using double-layer dielectric plates. In Chapter 4, nanosecond pulses are employed to generate diffuse DBD plasmas. Three main discharge stages are distinguished by ICCD images, i.e., the streamer breakdown from the needle tip to the plate electrode, the regime transition from streamer to diffuse plasma, and the propagation of surface discharge on the plate electrode surface. The chapter reveales that in nanosecond pulsed discharges the vibrational temperature of N2 increases with the discharge duration, while the rotational temperature mainly stays constant, which means electron energy is transferred into the vibrational levels, but gas heating is not obvious during the discharge pulse. In Chapter 5, both sine AC DBD and nanosecond pulsed DBD, studied in Chapter 2 and 3, are used for formaldehyde degradation. It is found that nanosecond pulsed DBD has more homogenous characteristics, better stability, and lower plasma gas temperature. Moreover, the energy consumption of nanosecond pulsed DBD is much lower than that of AC DBD. In Chapter 6, a 0D chemical kinetics model is developed to investigate the underlying plasma chemistry of methane dry reforming in a nanosecond pulsed discharge. An overview of the dominant reaction pathways of CO2 and CH4 conversion into the major products is given. Furthermore, most of the CO2 molecules are populated into vibrational states during the pulse. Hence, the vibrational states of CO2 play an important role in its dissociation process. In general, this PhD thesis contributes to a better insight in the mechanisms of sinusoidal AC DBD and nanosecond pulsed DBD plasmas and their applications, i.e., decomposition of formaldehyde and dry reforming of methane. |
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Most recent IF: NA |
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UA @ admin @ c:irua:183166 |
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7605 |
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Klaassen, L.; van der Snickt, G.; Legrand, S.; Higgitt, C.; Spring, M.; Vanmeert, F.; Rosi, F.; Brunetti, B.G.; Postec, M.; Janssens, K. |
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Characterization and removal of a disfiguring oxalate crust on a large altarpiece by Hans Memling |
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H1 Book chapter |
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2019 |
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263-282
T2 - Metal soaps in art / Casadio, F. [edi |
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H1 Book chapter; Art; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Antwerp Cultural Heritage Sciences (ARCHES) |
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During the conservation treatment of Memling’s Christ with Singing and Music-making Angels, three panel paintings that are among the most monumental works in early Netherlandish art, the conservators came across insoluble surface layers containing calcium oxalates. A very thin and irregular layer of this type, hardly visible to the naked eye, was spread across the surface of all three panels. A much thicker layer forming an opaque and highly disfiguring crust that obscured the composition (Figs. 15.1 and 15.7) was locally present on areas of dark copper-containing paint, where multiple layers of old discolored coatings and accretions remained in place before the most recent cleaning. This article describes the application of a wide range of analytical techniques in order to fully understand the stratigraphy and composition of the crusts on the Memling paintings. FTIR spectroscopy in transmission and reflection mode, micro-ATR-FTIR imaging and macro-rFTIR scanning, SEM-EDX, mobile XRD, and SR-μXRD showed that the crusts contained two related Ca-based oxalate salts, whewellite and weddellite, and were separated from the original paint surface by varnish, indicating that they did not originate from degradation of the original paint but from a combination of microbial action and a thick accumulation of dirt. Supported by the results from these different analytical techniques, which when used together proved to be very effective in providing complementary information that addressed this specific conservation problem, and aided by the presence of the intermediate varnish layer(s), the conservators were able to remove most of the crusts with spectacular results. |
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2019-03-23 |
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978-3-319-90616-4 |
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UA @ admin @ c:irua:190778 |
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7609 |
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Wonders, J.H.A.M.; Houweling, S.; de Bont, F.A.J.; van Leeuwen, H.P.; Eeckhaoudt, S.M.; Van Grieken, R. |
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Characterization of aerosol-associated lead by DPASV and LAMMA |
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1994 |
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International journal of environmental analytical chemistry |
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56 |
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193-205 |
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A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation) |
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A1994PF99800002 |
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2007-07-07 |
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0306-7319 |
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UA library record; WoS full record; WoS citing articles |
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UA @ admin @ c:irua:9514 |
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7611 |
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