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“Gravitational energy of solar oscillations and climatic changes”. Callebaut DK, Makarovska Y, Tlatov, 463, 297 (2000)
Abstract: The gravitational energy associated with variations in the radius of the Sun is huge: with a relative change of 1/2000 (the estimated difference between maximum and minimum solar activity) and taking only the convection zone to expand, corresponds to about 2 10(34)J, which is 1/10 of the total rotational energy of the Sun. Non-radial oscillations with a tiny nonlinearity can still yield energies comparable to or larger than the total magnetic energy of a full sunspot cycle or three or four orders more than the luminosity of the Sun, but that is not sufficient to account for the changes of the temperature on Earth. The expansion of the upper layers of the convection zone, however, may directly or indirectly affect the climate and the biological aspects on the Earth. Moreover this suits a qualitative explanation why the Sun expands during a minimum of the magnetic activity.
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“On the relationship between current and magnetic field in ring-filaments”. Callebaut DK, Makarovska Y, 150, 111 (1998)
Abstract: There is a type of filament that forms dosed contours encircling regions of one polarity of magnetic field, while the surrounding region has the opposite polarity One distribution of ring-filaments has sizes 2R = 40,000 to 160,000 km with the maximum around 100,000 km; the other distribution (with filaments and filament channels) has bigger sizes, with a maximum around 300,000 km. At low and mid latitudes the radial component B-rs (radial for the Sun) in the region outlined by filaments varies from 50 to 100 gauss, while the longitudinal component B-phi varies from 10 to 30 gauss. The total current inside the filament is 10(10) – 10(11) A, the ratio R/a approximate to 5 to 10, the magnetic flux crossing the surface is approximate to 10(21) – 10(22) MX; th, magnetic energy is approximate to 10(29) – 10(31) erg. Polar ring-filaments at latitudes 60 degrees-80 degrees are related to the polar magnetic field reversal and the quasi-flare processes at the poles during the field reversal. Correlation between B-rs and B-phi for the polar filament bands cannot be satisfactorily explained. A theoretical model using the conservation laws is used to study the relations between the various fields, currents, etc, of shrinking polar ring-filaments and their evolution. According to this theory ring-filaments should rise higher above the photosphere when shrinking. However, observations show that the height lowers. Presumably the discrepancy is due to the lack of dissipation in the model.
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“PCR amplified DNAzyme-amplicons for generic solid-phase antimicrobial resistance screening”. Peeters B, Safdar S, Carlier B, Spasic D, Daems D, Lammertyn J, , 971 (2019)
Abstract: Fiber optic surface plasmon resonance (FO-SPR) has shown its potential for the detection of nucleic acids and more recently the technology has been combined with catalytic active strands such as DNAzymes. In this work, an innovative, generic solid-phase DNA sensor concept is presented, based on FO-SPR and PCR amplified DNAzyme activity. Improved levels of specificity and sensitivity were obtained down to picomolar concentrations. Moreover, the FO-SPR sensor concept enables AuNP amplified DNA target detection, independent of the target sequence length. The FO-SPR sensor was demonstrated for the screening of the mobile colistin resistance (MCR-2) gene, a gene important for the antimicrobial resistance in Gram-negative species such as E. Coli.
Keywords: P1 Proceeding; Engineering sciences. Technology; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Preliminary experiments on grazing-exit electron probe microanalysis (GE-EPMA)”. Tsuji K, Spolnik Z, Wagatsuma K, Nullens R, Van Grieken RE, , 119 (1999)
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Recent developments of laboratory grazing emission X-ray fluorescence spectrometry”. Claes M, de Bokx P, Van Grieken R, , 103 (1999)
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“The SALUT project : study of advanced laser techniques for the uncovering of polychromed works of art”. van der Snickt G, de Boeck A, Keutgens K, Anthierens D, 116, 151 (2007)
Abstract: In order to find out whether the existing laser systems can be employed to remove superimposed layers of paint on secco wall paintings in a selective way, laser tests were carried out on three types of prepared samples simulating three stratigraphies that are frequently encountered in practice. OM, EPMA, colorimetry, mu Raman, and FT-IR were used to evaluate the results. It was found that Q-switched Nd:YAG lasers emitting at 1,064 nm could be employed to remove unwanted layers of oil paint and limewash, but the treatment of large areas requires implementation of a computer-controlled X-Y-Z station in order to control the parameters. However, the applicability of this technique will remain limited as ablation at the established optimum parameters implied a discoloration of the pigments cinnabar, yellow ochre, and burnt sienna. Moreover, it was observed that no ablation took place when the limewash thickness exceeds 25 mu m. Unwanted layers of acrylic could be removed in an efficient way with an excimer laser emitting at 193 nm.
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Short and long term effect of decreasing temperature on anammox activity and enrichment in mainstream granular sludge process”. De Cocker P, Bessiere Y, Hernandez-Raquet G, Dubos S, Mercade M, Sun XY, Mozo I, Barillon B, Gaval G, Caligaris M, Martin Ruel S, Vlaeminck SE, Sperandio M, 4, 50 (2017). http://doi.org/10.1007/978-3-319-58421-8_8
Abstract: This study investigates the impact of lower temperature on short term and long term (down to 10 degrees C) on a completely anoxic anammox granular sludge process. This is the first time granular sludge Anammox is operated in pure anoxic condition in SBR and at low temperature. Conversion performance, kinetic parameters, sludge characteristics and microbial community were analyzed.
Keywords: P1 Proceeding; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL)
DOI: 10.1007/978-3-319-58421-8_8
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“Some new applications of auxiliary signals in X-ray fluorescence and electron microprobe analysis”. Kuczumow A, Vekemans B, Schalm O, Vincze L, Dorriné, W, Gysels K, Van Grieken R, , 197 (1999)
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“X-ray fluorescence microtomography and polycapillary based confocal imaging using synchrotron radiation”. Vincze L, Vekemans B, Szaloki I, Brenker FE, Falkenberg G, Rickers K, Aerts K, Van Grieken R, Adams F, , 220 (2004). http://doi.org/10.1117/12.560416
Abstract: Ibis work illustrates the development of X-ray fluorescence tomography and polycapillary based confocal imaging towards a three-dimensional (313), quantitative analytical method with lateral resolution levels down to the 2-20 mum scale. Detailed analytical characterization is given for polycapillary based confocal XRF imaging, which is a new variant of the 3D micro-XRF technique. Applications for 2D/3D micro-XR-F are illustrated for the analysis of biological (zooplankton) and geological samples (microscopic inclusions in natural diamonds and fluid inclusions in quartz). Based on confocal imaging, fully three-dimensional distributions of trace elements could be obtained, representing a significant generalization of the regular 2D scanning technique for micro-XRF spectroscopy. The experimental work described in this paper has been carried out at the ESRF ID18F microfluorescence end-station and at HASYLAB Beam Line L.
Keywords: P1 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1117/12.560416
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“Advanced particle swarm optimization methods for electromagnetics”. Mescia L, Bia P, Gielis J, Caratelli D, , 109 (2023). http://doi.org/10.55060/s.atmps.231115.010
Abstract: Electromagnetic design problems involve optimizing multiple parameters that are nonlinearly related to objective functions. Traditional optimization techniques require significant computational resources that grow exponentially as the problem size increases. Therefore, a method that can produce good results with moderate memory and computational resources is desirable. Bioinspired optimization methods, such as particle swarm optimization (PSO), are known for their computational efficiency and are commonly used in various scientific and technological fields. In this article we explore the potential of advanced PSO-based algorithms to tackle challenging electromagnetic design and analysis problems faced in real-life applications. It provides a detailed comparison between conventional PSO and its quantum-inspired version regarding accuracy and computational costs. Additionally, theoretical insights on convergence issues and sensitivity analysis on parameters influencing the stochastic process are reported. The utilization of a novel quantum PSO-based algorithm in advanced scenarios, such as reconfigurable and shaped lens antenna synthesis, is illustrated. The hybrid modeling approach, based on the unified geometrical description enabled by the Gielis Transformation, is applied in combination with a suitable quantum PSO-based algorithm, along with a geometrical tube tracing and physical optics technique for solving the inverse problem aimed at identifying the geometrical parameters that yield optimal antenna performance.
Keywords: P1 Proceeding; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL)
DOI: 10.55060/s.atmps.231115.010
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“Conquering Mount Improbable”. Gielis J, , 153 (2023). http://doi.org/10.55060/s.atmps.231115.013
Abstract: Our scientific and technological worldviews are largely dominated by the concepts of entropy and complexity. Originating in 19th-century thermodynamics, the concept of entropy merged with information in the last century, leading to definitions of entropy and complexity by Kolmogorov, Shannon and others. In its simplest form, this worldview is an application of the normal rules of arithmetic. In this worldview, when tossing a coin, a million heads or tails in a row is theoretically possible, but impossible in practice and in real life. On this basis, the impossible (in the binary case, the outermost entries of Pascal's triangle xn and yn for large values of n) can be safely neglected, and one can concentrate fully on what is common and what conforms to the law of large numbers, in fields ranging from physics to sociology and everything in between. However, in recent decades it has been shown that what is most improbable tends to be the rule in nature. Indeed, if one combines the outermost entries xn and yn with the normal rules of arithmetic, either addition or multiplication, one obtains Lamé curves and power laws respectively. In this article, some of these correspondences are highlighted, leading to a double conclusion. First, Gabriel Lamé's geometric footprint in mathematics and the sciences is enormous. Second, conic sections are at the core once more. Whereas mathematics so far has been exclusively the language of patterns in the sciences, the door is opened for mathematics to also become the language of the individual. The probabilistic worldview and Lamé's footprint can be seen as dual methods. In this context, it is to be expected that the notions of information, complexity, simplicity and redundancy benefit from this different viewpoint.
Keywords: P1 Proceeding; Economics; Sustainable Energy, Air and Water Technology (DuEL)
DOI: 10.55060/s.atmps.231115.013
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“A note on Generalized Möbius-Listing Bodies”. Gielis J, Tavkhelidze I, , 31 (2023). http://doi.org/10.55060/s.atmps.231115.003
Abstract: Generalized Möbius-Listing surfaces and bodies generalize Möbius bands, and this research was motivated originally by solutions of boundary value problems. Analogous to cutting of the original Möbius band, for this class of surfaces and bodies, results have been obtained when cutting such bodies or surfaces. In general, cutting leads to interlinked and intertwined different surfaces or bodies, resulting in very complex systems. However, under certain conditions, the result of cutting can be a single surface or body, which reduces complexity considerably. These conditions are based on congruence and rotational symmetry of the resulting cross sections after cutting, and on the knife cutting the origin
Keywords: P1 Proceeding; Sustainable Energy, Air and Water Technology (DuEL)
DOI: 10.55060/s.atmps.231115.003
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“Reconstructing Sweerts : practical insights into the historical dark halo technique based on paint reconstructions”. Derks K, Youchaeva M, Van der Snickt G, Van der Stighelen K, Janssens K, , 259 (2024)
Keywords: P1 Proceeding; Engineering sciences. Technology; Art; Antwerp Cultural Heritage Sciences (ARCHES); Antwerp X-ray Imaging and Spectroscopy (AXIS)
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Bogaerts A, Berthelot A, Heijkers S, Kozá,k T (2015) Computer modeling of a microwave discharge used for CO2 splitting. UCO Press, Cordoba, 41–50
Keywords: P2 Proceeding; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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Berthelot A, Kolev S, Bogaerts A (2015) Different pressure regimes of a surface-wave discharge in argon : a modelling investigation. UCO Press, Cordoba, 57–62
Keywords: P2 Proceeding; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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Caen J, Schalm O, Janssens K (2009) 15th century stained-glass windows in the former County of Flanders : a historical and chemical study related to recent conservation campaigns. 459–466
Keywords: P2 Proceeding; Engineering sciences. Technology; History; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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Schalm O, Caen J, Janssens K (2007) Chemical composition of 19th century window glass originating from stianed glass windows located in Belgium. 169–178
Keywords: P2 Proceeding; Engineering sciences. Technology; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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De Vis K, Cagno S, Van Mol W, Schalm O, Janssens K, Caen J (2012) The decolourization of manganese-stained glass : the conversion reaction and evaluation of its effectiveness. 463–468
Keywords: P2 Proceeding; Engineering sciences. Technology; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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De Vis K, Jacobs P, Caen J, Janssens K (2010) The use of glass bricks in architecture in the 19th and 20th centuries : a case study. 194–201
Keywords: P2 Proceeding; Engineering sciences. Technology; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Aerosol synthesis of nanostructured, ultrafine fullerene particles”. Joutsensaari J, Ahonen PP, Tapper U, Kauppinen EI, Pauwels B, Amelinckx S, Van Tendeloo G, (1999)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Application of trace element analysis to geothermal waters”. Gijbels R, van Grieken R, Blommaert W, Vandelannoote R, Van 't dack L, , 429 (1977)
Keywords: P3 Proceeding; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Atomic resolution of interfaces in ceramic-superconductors”. Van Tendeloo G, Krekels T, Amelinckx S, Hervieu M, Raveau B, Greaves C, , 35 (1995)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Atomic scale characterization of supported and assembled nanoparticles”. Pauwels B, Yandouzi M, Schryvers D, Van Tendeloo G, Verschoren G, Lievens P, Hou M, van Swygenhoven H, , B8.3 (2001)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Atomic scale modeling of supported and assembled nanoparticles”. Zhurkin E, Hou M, van Swygenhoven H, Pauwels B, Yandouzi M, Schryvers D, Van Tendeloo G, Lievens P, Verschoren G, Kuriplach J, van Peteghem S, Segers D, Dauwe C, , B8.2 (2001)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Binding of remote and spatial separated D- centers in double barrier resonant tunneling semiconductor devices”. Marmorkos IK, Schweigert VA, Peeters FM, Lok JGS, , 2769 (1996)
Keywords: P3 Proceeding; Condensed Matter Theory (CMT)
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“Catalyst traces after chemical purification in CVD grown carbon nanotubes”. Biró, LP, Khanh NQ, Horváth ZE, Vértesy Z, Kocsonya A, Konya Z, Osváth Z, Koós A, Guylai J, Zhang XB, Van Tendeloo G, Fonseca A, Nagy JB, , 183 (2001)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Cation ordering in Tl- and Hg-based superconducting materials”. Van Tendeloo G, De Meulenaere P, Hervieu M, Letouze F, Martin C, (1996)
Keywords: P3 Proceeding; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
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“Characterization of crystal defects and analysis of iodide distribution in mixed tabular silver halide grains by conventional transmission electron microscopy, X-ray diffractometry and back-scattered electron imaging”. Goessens C, Schryvers D, van Landuyt J, Amelinckx S, Geuens I, Gijbels R, Jacob W, Verbeeck A, de Keyzer R, (1991)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT); Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
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“Charged-impurity correlations in a δ-doped quantum barrier”. Koenraad PM, Shi JM, van de Stadt AFW, Smets A, Perenboom JAAJ, Peeters FM, Devreese JT, Wolter JH, , 2351 (1996)
Keywords: P3 Proceeding; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
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“Charged-impurity correlations in Si ?-doped GaAs”. Shi JM, Koenraad PM, van de Stadt AFW, Peeters FM, Devreese JT, Wolter JH, , 2351 (1996)
Keywords: P3 Proceeding; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
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