Guido Van Hooydonk - Profile on Academia.edu (original) (raw)

Papers by Guido Van Hooydonk

Bibliometric analysis of 54 journals, covered by the Social Science Citation Index

Characterization of pigments in Mercatellis manuscripts by total-reflection X-Ray Fluorescence and Raman-microscopy

Zeitschrift für Naturforschung A, 1982

For 39 diatomic ionic and non-ionic molecules, the anomalous behaviour of the spectral para-meter... more For 39 diatomic ionic and non-ionic molecules, the anomalous behaviour of the spectral para-meters αe and ωχxe with respect to the bond type is reviewed. It is shown that on using a "uni-versal" Sutherland parameter defined as ⊿ = ½kere 2/Dion, the anomalous behaviour disappears. Hard spectroscopic evidence is thus presented, for the first time to the author's knowledge, that just one bond type, in fact an ionic one, can account, in first approximation, for the spectral behaviour of both non-ionic and ionic bonds, H2 included.

Technology and collaboration: creating an effective information environment in an academic context

The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential... more The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential, which takes into account internal H 2 symmetries. All constants ω e , k e , and r e needed for the H 2 vibrational system derive from hydrogen mass. Ionic Kratzer bond theory gives covalent bond energy within 0.08% and all levels within 0.02%, which is 30 times better than with a Dunham oscillator and as accurate as early ab initio quantum mechanics.

A bibliotheconomic analysis of the impact factors of scientific disciplines

ABSTRACT

This comparative study covers the period 1988-2003 of the Institute for Scientific Information Da... more This comparative study covers the period 1988-2003 of the Institute for Scientific Information Databases (ISI-DBs), CD-ROM edition: Science Citation Index (SCI), Social Sciences Citation Index (SSCI) and Arts & Humanities Citation Index (A&HCI) as international databases and from the CubaCiencias (CubaCiencias) as an internal database. The number of articles published in Cuban journals, ISI-DBs, the author associativeness trend, the most important institutions and other indicators are collected. However, it is observed that CubaCiencias and ISI-DBs are not perfectly suitable for a study of the productivity of Cuban authors. It is necessary to properly standardize the author fields. For bibliometric studies, Cuba needs a database not only for the published papers in Cuban journals, but also for all the papers published by Cuban authors.

Ciencias de la Información, 2005

Se presenta el nuevo indicador de Visibilidad-impacto como una alternativa para medir la repercus... more Se presenta el nuevo indicador de Visibilidad-impacto como una alternativa para medir la repercusion de la ciencia en la region iberoamericana que no estan incluidas en las bases de datos del Institute for Scientific Information (ISI) de Phipladelphia, Pensylvania en E.U. Se exponen sus caracteristicas como un indicador multivariado y se destaca su enfoque sinergico y sistemico al permitir analisis integrados para medir la actividad, productividad y progreso del quehacer cientifico y tecnologico. Se muestran algunas de sus aplicaciones mas generalizadas, ai como su representacion grafica y se enfatiza en la opinion de los expertos como criterio indispensable en la interpretacion de los resultados bibliometricos.

Fractional counting of multiauthored publications: Consequences for the impact of authors

Investigation of pigments in medieval manuscripts by micro Raman spectroscopy and total reflection X-ray fluorescence spectrometry

1 Laboratory of Analytical Chemistry, Proeftuinstraat 86, 9000 Gent, Belgium 2 Institute of Spect... more 1 Laboratory of Analytical Chemistry, Proeftuinstraat 86, 9000 Gent, Belgium 2 Institute of Spectrochemistry and Applied Spectroscopy (ISAS), PO Box 101352, 44013 Dortmund, Germany 3 Department of Library Sciences, University of Ghent, Rozier 9, 9(3'00 Gent, Belgium

Macroscopic P (V) diagrams are consistent with microscopic U(r) diagrams, with U an (internal) en... more Macroscopic P (V) diagrams are consistent with microscopic U(r) diagrams, with U an (internal) energy of type 1/r, where r is a particle separation. If a universal equation of state (UEOS) for atoms exists, P (V) or U(r) diagrams can be used with the Vanderwaals-Maxwell binodal and spinodal. This reveals the energy dependence of an atom upon size variations and the corresponding intra-atomic phasetransition. We show that the H Lyman ns-series indeed provides evidence for an intra-atomic phase-transition. We promote Bohr 1/n2 theory to an ideal atom theory, with atomic size varying as r=n2r0, wherein only the Bohr radius r0 = ħ2/μe2 and n, the principal quantum number, are needed. We detect a critical point for a phase-transition in H for n between 5 and 6, if the Bohr Rydberg 109678.7737 cm-1, the H ground state energy, is used as the asymptote. Unlike bound state QED, we associate this phase-transition with a shift from an atom (hydrogen)to an antiatom (antihydrogen)-state. This sy...

Fractional counting of multiauthored publications - Rejoinder

Application of sociometric and event-history modelling to bibliometric data: the case of transgene plants

Kratzer Potential for Vibrational Levels in Molecular Hydrogen

The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential... more The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential, which takes into account internal H2 symmetries. All constants ω

We review harmonic oscillator theory for closed, stable quantum systems. The H 2 potential energy... more We review harmonic oscillator theory for closed, stable quantum systems. The H 2 potential energy curve (PEC) of Mexican hat-type, calculated with a confined Kratzer oscillator, is better than the Rydberg-Klein-Rees (RKR) H 2 PEC. Compared with QM, the theory of chemical bonding is simplified, since a confined Kratzer oscillator gives the long sought for universal function, once called the Holy Grail of Molecular Spectroscopy. This is validated with HF, I 2 , N 2 and O 2 PECs. We quantify the entanglement of spatially separated H 2 quantum states, which gives a braid view. The equal probability for H 2 , originating either from H A +H B or H B +H A , is quantified with a Gauss probability density function. At the Bohr scale, confined harmonic oscillators behave properly at all extremes of bound two-nucleon quantum systems and are likely to be useful also at the nuclear scale.

We probe Penrose's five-fold symmetry in the hydrogen atom using its radius rH as derived classic... more We probe Penrose's five-fold symmetry in the hydrogen atom using its radius rH as derived classically from its mass mH. This generic H symmetry, obeying Euclid's golden ratio [sqrt(5)-1]/2 for its 2 constituent complementary parts, is confirmed with precise H terms. These give away a Hundtype Mexican hat curve for natural H, which points to its mirrored variant, antihydrogen H. We predict that term H 1S-3S, to be measured soon, is 2 922 743 278 654(2) kHz.

Further applications of charge-invariance effects upon chemical interactions

J Mol Struc Theochem, 1985

ABSTRACT

An internal inconsistency with mutually exclusive Hamiltonians and the corresponding mutually exc... more An internal inconsistency with mutually exclusive Hamiltonians and the corresponding mutually exclusive states HH and H-antiH suffices to doubt the usefulness of ab initio calculations for H-antiH based on 1927 Heitler-London theory. Removing this inconsistency in a generic way invalidates this theory but the compensation is that problems with antihydrogen are removed.

Mikrochimica Acta, Nov 30, 1999

Analytical pigment investigation can reveal important information for art-historians. The use of ... more Analytical pigment investigation can reveal important information for art-historians. The use of two micro-analytical techniques, micro Raman-spectroscopy and total reflection X-ray fluorescence, is shown to be very successful. These techniques give complementary information: Raman spectroscopy allows the identification of the different materials the pigment grains consist of, and total reflection X-ray fluorescence gives the average elemental composition of the sample. The latter is helpful to distinguish between the different palettes used by different artists or workshops. Samples can be taken with cotton wool swabs (Q-tips), which cause no visible alteration to the artefact. Such a sample allows both Raman-spectroscopy and total reflection X-ray fluorescence to be applied using less than 1 ~g of material. This approach is illustrated with the pigment investigation of seven late-medieval Mercatellis manuscripts, kept in the Ghent University Library.

Bibliometric analysis of 54 journals, covered by the Social Science Citation Index

Characterization of pigments in Mercatellis manuscripts by total-reflection X-Ray Fluorescence and Raman-microscopy

Zeitschrift für Naturforschung A, 1982

For 39 diatomic ionic and non-ionic molecules, the anomalous behaviour of the spectral para-meter... more For 39 diatomic ionic and non-ionic molecules, the anomalous behaviour of the spectral para-meters αe and ωχxe with respect to the bond type is reviewed. It is shown that on using a "uni-versal" Sutherland parameter defined as ⊿ = ½kere 2/Dion, the anomalous behaviour disappears. Hard spectroscopic evidence is thus presented, for the first time to the author's knowledge, that just one bond type, in fact an ionic one, can account, in first approximation, for the spectral behaviour of both non-ionic and ionic bonds, H2 included.

Technology and collaboration: creating an effective information environment in an academic context

The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential... more The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential, which takes into account internal H 2 symmetries. All constants ω e , k e , and r e needed for the H 2 vibrational system derive from hydrogen mass. Ionic Kratzer bond theory gives covalent bond energy within 0.08% and all levels within 0.02%, which is 30 times better than with a Dunham oscillator and as accurate as early ab initio quantum mechanics.

A bibliotheconomic analysis of the impact factors of scientific disciplines

ABSTRACT

This comparative study covers the period 1988-2003 of the Institute for Scientific Information Da... more This comparative study covers the period 1988-2003 of the Institute for Scientific Information Databases (ISI-DBs), CD-ROM edition: Science Citation Index (SCI), Social Sciences Citation Index (SSCI) and Arts & Humanities Citation Index (A&HCI) as international databases and from the CubaCiencias (CubaCiencias) as an internal database. The number of articles published in Cuban journals, ISI-DBs, the author associativeness trend, the most important institutions and other indicators are collected. However, it is observed that CubaCiencias and ISI-DBs are not perfectly suitable for a study of the productivity of Cuban authors. It is necessary to properly standardize the author fields. For bibliometric studies, Cuba needs a database not only for the published papers in Cuban journals, but also for all the papers published by Cuban authors.

Ciencias de la Información, 2005

Se presenta el nuevo indicador de Visibilidad-impacto como una alternativa para medir la repercus... more Se presenta el nuevo indicador de Visibilidad-impacto como una alternativa para medir la repercusion de la ciencia en la region iberoamericana que no estan incluidas en las bases de datos del Institute for Scientific Information (ISI) de Phipladelphia, Pensylvania en E.U. Se exponen sus caracteristicas como un indicador multivariado y se destaca su enfoque sinergico y sistemico al permitir analisis integrados para medir la actividad, productividad y progreso del quehacer cientifico y tecnologico. Se muestran algunas de sus aplicaciones mas generalizadas, ai como su representacion grafica y se enfatiza en la opinion de los expertos como criterio indispensable en la interpretacion de los resultados bibliometricos.

Fractional counting of multiauthored publications: Consequences for the impact of authors

Investigation of pigments in medieval manuscripts by micro Raman spectroscopy and total reflection X-ray fluorescence spectrometry

1 Laboratory of Analytical Chemistry, Proeftuinstraat 86, 9000 Gent, Belgium 2 Institute of Spect... more 1 Laboratory of Analytical Chemistry, Proeftuinstraat 86, 9000 Gent, Belgium 2 Institute of Spectrochemistry and Applied Spectroscopy (ISAS), PO Box 101352, 44013 Dortmund, Germany 3 Department of Library Sciences, University of Ghent, Rozier 9, 9(3'00 Gent, Belgium

Macroscopic P (V) diagrams are consistent with microscopic U(r) diagrams, with U an (internal) en... more Macroscopic P (V) diagrams are consistent with microscopic U(r) diagrams, with U an (internal) energy of type 1/r, where r is a particle separation. If a universal equation of state (UEOS) for atoms exists, P (V) or U(r) diagrams can be used with the Vanderwaals-Maxwell binodal and spinodal. This reveals the energy dependence of an atom upon size variations and the corresponding intra-atomic phasetransition. We show that the H Lyman ns-series indeed provides evidence for an intra-atomic phase-transition. We promote Bohr 1/n2 theory to an ideal atom theory, with atomic size varying as r=n2r0, wherein only the Bohr radius r0 = ħ2/μe2 and n, the principal quantum number, are needed. We detect a critical point for a phase-transition in H for n between 5 and 6, if the Bohr Rydberg 109678.7737 cm-1, the H ground state energy, is used as the asymptote. Unlike bound state QED, we associate this phase-transition with a shift from an atom (hydrogen)to an antiatom (antihydrogen)-state. This sy...

Fractional counting of multiauthored publications - Rejoinder

Application of sociometric and event-history modelling to bibliometric data: the case of transgene plants

Kratzer Potential for Vibrational Levels in Molecular Hydrogen

The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential... more The vibrational part of the dihydrogen Hamiltonian obeys a quantized Sommerfeld-Kratzer potential, which takes into account internal H2 symmetries. All constants ω

We review harmonic oscillator theory for closed, stable quantum systems. The H 2 potential energy... more We review harmonic oscillator theory for closed, stable quantum systems. The H 2 potential energy curve (PEC) of Mexican hat-type, calculated with a confined Kratzer oscillator, is better than the Rydberg-Klein-Rees (RKR) H 2 PEC. Compared with QM, the theory of chemical bonding is simplified, since a confined Kratzer oscillator gives the long sought for universal function, once called the Holy Grail of Molecular Spectroscopy. This is validated with HF, I 2 , N 2 and O 2 PECs. We quantify the entanglement of spatially separated H 2 quantum states, which gives a braid view. The equal probability for H 2 , originating either from H A +H B or H B +H A , is quantified with a Gauss probability density function. At the Bohr scale, confined harmonic oscillators behave properly at all extremes of bound two-nucleon quantum systems and are likely to be useful also at the nuclear scale.

We probe Penrose's five-fold symmetry in the hydrogen atom using its radius rH as derived classic... more We probe Penrose's five-fold symmetry in the hydrogen atom using its radius rH as derived classically from its mass mH. This generic H symmetry, obeying Euclid's golden ratio [sqrt(5)-1]/2 for its 2 constituent complementary parts, is confirmed with precise H terms. These give away a Hundtype Mexican hat curve for natural H, which points to its mirrored variant, antihydrogen H. We predict that term H 1S-3S, to be measured soon, is 2 922 743 278 654(2) kHz.

Further applications of charge-invariance effects upon chemical interactions

J Mol Struc Theochem, 1985

ABSTRACT

An internal inconsistency with mutually exclusive Hamiltonians and the corresponding mutually exc... more An internal inconsistency with mutually exclusive Hamiltonians and the corresponding mutually exclusive states HH and H-antiH suffices to doubt the usefulness of ab initio calculations for H-antiH based on 1927 Heitler-London theory. Removing this inconsistency in a generic way invalidates this theory but the compensation is that problems with antihydrogen are removed.

Mikrochimica Acta, Nov 30, 1999

Analytical pigment investigation can reveal important information for art-historians. The use of ... more Analytical pigment investigation can reveal important information for art-historians. The use of two micro-analytical techniques, micro Raman-spectroscopy and total reflection X-ray fluorescence, is shown to be very successful. These techniques give complementary information: Raman spectroscopy allows the identification of the different materials the pigment grains consist of, and total reflection X-ray fluorescence gives the average elemental composition of the sample. The latter is helpful to distinguish between the different palettes used by different artists or workshops. Samples can be taken with cotton wool swabs (Q-tips), which cause no visible alteration to the artefact. Such a sample allows both Raman-spectroscopy and total reflection X-ray fluorescence to be applied using less than 1 ~g of material. This approach is illustrated with the pigment investigation of seven late-medieval Mercatellis manuscripts, kept in the Ghent University Library.