Vereecken C.,Research Foundation Flanders FWO Vlaanderen
Public health nutrition | Year: 2012
To evaluate a web-based nutritional knowledge questionnaire for primary-school children. Children's nutritional knowledge was assessed in five domains: healthy choices (twenty-seven items), estimated recommended portions/servings (eight items), nutrient content (five items), main food function (five items) and categorization of food items (eight items). The questionnaires were completed in school. A convenience sample of 576 Belgian children (aged 7-12 years) from fourteen primary schools completed the questionnaire once, 386 completed the questionnaire twice. Healthy choices could be answered correctly by 73 % of the children, nutrients by 59 %, food categorization by 49 %, main function by 38 % and portion estimation by 36 %. Children's test-retest intra-class correlations were 0·75 for healthy choices, 0·33 for nutrients, 0·61 for food categorization, 0·44 for main function, 0·47 for portion estimation and 0·76 for the total scale. The intra-class correlation was lower in the youngest age group (grade 2: 0·51, grade 4: 0·65, grade 6: 0·66). The total score was significantly lower in the retest. The instrument was in general positively evaluated by the children. The instrument is a promising, practical, inexpensive tool with acceptable test-retest reliability in fourth and sixth graders.
Deschrijver D.,Interdisciplinary Institute for BroadBand Technology IBBT |
Deschrijver D.,Research Foundation Flanders FWO Vlaanderen |
Dhaene T.,Interdisciplinary Institute for BroadBand Technology IBBT
IEEE Microwave and Wireless Components Letters | Year: 2012
A robust approach for parametric macromodeling of tabulated frequency responses is presented. An existing technique is modified in such a way that interpolation is performed at the numerator and denominator level, rather than the transfer function level. This enhancement ensures that the poles of the parametric macromodel are fully parameterized. It strengthens the modeling capabilities and improves the model compactness. © 2012 IEEE.
Vereecken C.A.,Research Foundation Flanders FWO Vlaanderen |
Vereecken C.A.,Ghent University |
De Bourdeaudhuij I.,Ghent University |
Maes L.,Ghent University
European Journal of Clinical Nutrition | Year: 2010
Objectives: To investigate the reproducibility of the HELENA Food Frequency Questionnaire (FFQ) developed as a basis for an online tailored intervention and to compare the FFQ with four computerized 24-h recalls. Subjects/methods: A convenience sample of 48 Belgian-Flemish adolescents completed four computerized 24-h recalls, the FFQ and a retest 1-2 weeks later. Correlations, the Wilcoxon's signed rank test and Bland and Altman's plots were used to compare the intakes of 22 food groups, energy (kcal), fibre (g, μg/1000 kcal), vitamin C (mg, mg/1000 kcal), calcium (mg, mg/1000 kcal), iron (mg, mg/1000 kcal) and fat (g, % from total energy).Results: Reproducibility correlations were good (0.46-0.90). De-attenuated correlations between both methods were high (≥0.51) for all nutrients and nutrient densities, except for fibre (g), vitamin C (mg) and percent energy from fat (respectively 0.23, 0.40 and 0.30). On a food group level correlations were significant (r unadjusted >0.3) for most (17/22) food groups. No systematic differences were found between test and retest; comparison with the recalls resulted in a significantly higher intake of bread, breakfast cereals, other snacks, vegetables, potatoes, coffee and tea, alcoholic beverages, energy, and most nutrients. No significant difference was found for calcium, whereas an underestimation was found for nutrient density of calcium and fat. Conclusions: The overestimation in seven food groups, resulting in an overestimation of energy, fibre, iron and vitamin C, and underestimation of percentage energy from fat, needs to be considered when the estimated intakes are used for tailored feedback. © 2010 Macmillan Publishers Limited All rights reserved.
Simoen E.,Interuniversity MicroElectronics Center |
Mitard J.,Interuniversity MicroElectronics Center |
De Jaeger B.,Interuniversity MicroElectronics Center |
Eneman G.,Interuniversity MicroElectronics Center |
And 10 more authors.
IEEE Transactions on Electron Devices | Year: 2011
Low-frequency noise in strained Ge epitaxial layers, which are grown on a reverse-graded relaxed SiGe buffer layer, has been evaluated for different front-end processing conditions. It has been shown that the 1/f noise in strong inversion is governed by trapping in the gate oxide (number fluctuations) and not affected by the presence of compressive strain in the channel. However, some impact has been found from the type of halo implantation used, whereby the lowest noise spectral density and the highest hole mobility are obtained by replacing the standard As halo by P implantation. At the same time, omitting the junction anneal results in poor device characteristics, which can be understood by considering the presence of a high density of nonannealed implantation damage in the channel and the gate stack near the source and the drain. © 2006 IEEE.
Naudts J.,University of Antwerp |
Verhulst T.,University of Antwerp |
Verhulst T.,Research Foundation Flanders FWO Vlaanderen
Journal of Physics: Conference Series | Year: 2012
We introduce the notion of a generalised symmetry M of a hamiltonian H. It is a symmetry which has been broken in a very specific manner, involving ladder operators R and R †. In Theorem 1 these generalised symmetries are characterised in terms of repeated commutators of H with M. Breaking supersymmetry by adding a term linear in the supercharges is discussed as a motivating example. The complex parameter γ which appears in the definition of a generalised symmetry is necessarily real when the spectrum of M is discrete. Theorem 2 shows that γ must also be real when the spectrum of H is fully discrete and R and R † are bounded operators. Any generalised symmetry induces a partitioning of the spectrum of H in what we call M-multiplets. The hydrogen atom in the presence of a symmetry breaking external field is discussed as an example. The notion of stability of eigenvectors of H relative to the generalised symmetry M is discussed. A characterisation of stable eigenvectors is given in Theorem 3.
Stuyver T.,Vrije Universiteit Brussel |
Stuyver T.,Research Foundation Flanders FWO Vlaanderen |
Fias S.,Vrije Universiteit Brussel |
De Proft F.,Vrije Universiteit Brussel |
Geerlings P.,Vrije Universiteit Brussel
Journal of Physical Chemistry C | Year: 2015
A new selection rule for transmission under small voltage for molecular electronic devices consisting of alternant hydrocarbons is established, based on curly arrow drawings of the displacement of electrons through the conjugated system of the molecule. If the displacement of electrons from one contact atom to the other can be drawn, transmission is possible. If not, then no transmission will take place. This simple, back of the envelope ansatz allows determination of quantum interferences for a wide range of experimentally studied molecules (linear polyenes, benzenoids, cross-conjugated molecules,...) avoiding any calculation. This new selection rule bridges the conceptual gap between traditional reactivity theory and molecular electronics. © 2015 American Chemical Society.
Nelissen S.,Catholic University of Leuven |
Beullens K.,Catholic University of Leuven |
Beullens K.,Research Foundation Flanders FWO Vlaanderen |
Lemal M.,Catholic University of Leuven |
Van den Bulck J.,Catholic University of Leuven
Health Information and Libraries Journal | Year: 2015
Background: Nowadays, there is an abundance of health and cancer information in the mass media. Because of this high amount of information, it is possible for individuals to find or incidentally encounter cancer information, but it is also possible to be overloaded by this information and, consequently, to avoid it. Previous studies have indicated that fear of cancer could be both positively and negatively related to behaviours such as screening, help-seeking and information avoidance. Objective: The aims of this study were (1) to assess the relationship between fear of cancer and cancer information acquisition and avoiding behaviour, (2) to examine whether this relationship was curvilinear, and (3) to determine whether this relationship was moderated by being diagnosed with cancer or not. Method: Six hundred and twenty-one cancer diagnosed and 1387 non-diagnosed individuals were recruited through a convenience sample in Flanders (Belgium) and filled in a standardised survey questionnaire. Results: The results showed a positive linear association between fear of cancer and information seeking, scanning and avoiding. Being diagnosed with cancer or not did not moderate this relationship. Conclusion: Fear of cancer is positively associated with cancer information acquisition and avoiding behaviour. This suggests that fear of cancer predicts different behaviours in different individuals. © 2015 Health Libraries Group.
Roman B.I.,Ghent University |
Roman B.I.,Research Foundation Flanders FWO Vlaanderen |
Heugebaert T.S.A.,Ghent University |
Heugebaert T.S.A.,Research Foundation Flanders FWO Vlaanderen |
And 2 more authors.
Current Medicinal Chemistry | Year: 2013
One part of chemical space that is endowed with interesting biological properties is the area of the chalcones. With this review, we provide a comprehensive overview of the numerous in vivo animal studies on the antineoplastic potential of both natural and synthetic members of this flavonoid subclass (covering: up to mid-2011). The thus far identified modes of action of these compounds are also discussed. We hope that this overview may stimulate deeper investigations into the biochemical mechanisms by which chalcones exert their antineoplastic action. As a result, in the foreseeable future, chalcones may prove suitable lead molecules or early drug candidates for the prevention or treatment of various neoplastic diseases. © 2013 Bentham Science Publishers.
PubMed | Research Foundation Flanders FWO Vlaanderen
Type: Journal Article | Journal: Public health nutrition | Year: 2013
To investigate test-retest reliability of primary-school childrens reports of food preferences and to investigate agreement with parental reports.Children completed an online test and retest, one to two weeks later, during school hours; parents completed a paper-and-pencil or an online questionnaire at home. The childrens preferences questionnaire contained 148 food items, reduced to twelve scales; the parental questionnaire contained seventy-eight items reduced to nine scales.Children of fourteen primary schools in Belgium-Flanders.In total 572 children participated; test-retest data were available for 354 children, childrens tests could be matched to 362 parental reports.Test-retest intraclass correlations were on average 0.73, ranging between 0.62 and 0.86; correlations between childrens and parents reports were on average 0.50, ranging between 0.32 and 0.62. Retest preferences were significantly higher for more than half of the scales. Children reported higher preferences than their parents for milk & milk products, fruit and soft drinks, while parents reported higher preferences for bread & breakfast cereals, meat, snacks and sauces.The results indicate that the test-retest stability was good; however, agreement between parents and children was rather low to moderate.
PubMed | Research Foundation Flanders FWO Vlaanderen
Type: Journal Article | Journal: Public health nutrition | Year: 2013
To evaluate a web-based nutritional knowledge questionnaire for primary-school children.Childrens nutritional knowledge was assessed in five domains: healthy choices (twenty-seven items), estimated recommended portions/servings (eight items), nutrient content (five items), main food function (five items) and categorization of food items (eight items).The questionnaires were completed in school.A convenience sample of 576 Belgian children (aged 7-12 years) from fourteen primary schools completed the questionnaire once, 386 completed the questionnaire twice.Healthy choices could be answered correctly by 73 % of the children, nutrients by 59 %, food categorization by 49 %, main function by 38 % and portion estimation by 36 %. Childrens test-retest intra-class correlations were 075 for healthy choices, 033 for nutrients, 061 for food categorization, 044 for main function, 047 for portion estimation and 076 for the total scale. The intra-class correlation was lower in the youngest age group (grade 2: 051, grade 4: 065, grade 6: 066). The total score was significantly lower in the retest. The instrument was in general positively evaluated by the children.The instrument is a promising, practical, inexpensive tool with acceptable test-retest reliability in fourth and sixth graders.