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296 results on '"Holthusen H"'

1. Multivariate Methods for Detection of Rubbery Rot in Storage Apples by Monitoring Volatile Organic Compounds: An Example of Multivariate Generalised Mixed Models

Author

Pelck, J. S., Holthusen, H., Edelenbos, M., Luca, A., and Labouriau, R.

Subjects
Statistics - Applications
Abstract

This article is a case study illustrating the use of a multivariate statistical method for screening potential chemical markers for early detection of post-harvest disease in storage fruit. We simultaneously measure a range of volatile organic compounds (VOCs) and two measures of severity of disease infection in apples under storage: the number of apples presenting visible symptoms and the lesion area. We use multivariate generalised linear mixed models (MGLMM) for studying association patterns of those simultaneously observed responses via the covariance structure of random components. Remarkably, those MGLMMs can be used to represent patterns of association between quantities of different statistical nature. In the particular example considered in this paper, there are positive responses (concentrations of VOC, Gamma distribution based models), positive responses possibly containing observations with zero values (lesion area, Compound Poisson distribution based models) and binomially distributed responses (proportion of apples presenting infection symptoms). We represent patterns of association inferred with the MGLMMs using graphical models (a network represented by a graph), which allow us to eliminate spurious associations due to a cascade of indirect correlations between the responses., Comment: 11 pages and 1 figure

Published
2021

2. A macroscopic approach for stress driven anisotropic growth in bioengineered soft tissues

Author

Lamm, L., Holthusen, H., Brepols, T., Jockenhövel, S., and Reese, S.

Subjects
Computer Science - Computational Engineering, Finance, and Science, Condensed Matter - Soft Condensed Matter
Abstract

The simulation of growth processes within soft biological tissues is of utmost importance for many applications in the medical sector. Within this contribution we propose a new macroscopic approach fro modelling stress-driven volumetric growth occurring in soft tissues. Instead of using the standard approach of a-priori defining the structure of the growth tensor, we postulate the existance of a general growth potential. Such a potential describes all eligable homeostatic stress states that can ultimately be reached as a result of the growth process. Making use of well established methods from visco-plasticity, the evolution of the growth related right Cauchy-Green tensor is subsequently defined as a time dependent associative evolution law with respect to the introduced potential. This approach naturally leads to a formulation that is able to cover both, isotropic and anisotropic growth related changes in geometry. It furthermore allows the model to flexibly adapt to changing boundary and loading conditions. Besides the theoretical development, we also describe the algorithmic implementation and furthermore compare the newly derived model with a standard formulation of isotropic growth.

Published
2021
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11. Schmerz

Author

Holthusen, H., Mierdorf, T., Schneider, Frank, editor, and Fink, Gereon R., editor

Published
2007
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14. Multivariate Methods for Detection of Rubbery Rot in Storage Apples by Monitoring Volatile Organic Compounds:An Example of Multivariate Generalised Mixed Models

Author

Pelck, J. S., Holthusen, H., Edelenbos, M., Luca, A., and Labouriau, R.

Subjects
stat.AP
Abstract

This article is a case study illustrating the use of a multivariate statistical method for screening potential chemical markers for early detection of post-harvest disease in storage fruit. We simultaneously measure a range of volatile organic compounds (VOCs) and two measures of severity of disease infection in apples under storage: the number of apples presenting visible symptoms and the lesion area. We use multivariate generalised linear mixed models (MGLMM) for studying association patterns of those simultaneously observed responses via the covariance structure of random components. Remarkably, those MGLMMs can be used to represent patterns of association between quantities of different statistical nature. In the particular example considered in this paper, there are positive responses (concentrations of VOC, Gamma distribution based models), positive responses possibly containing observations with zero values (lesion area, Compound Poisson distribution based models) and binomially distributed responses (proportion of apples presenting infection symptoms). We represent patterns of association inferred with the MGLMMs using graphical models (a network represented by a graph), which allow us to eliminate spurious associations due to a cascade of indirect correlations between the responses.

Published
2021

17. A finite strain thermo-mechanically coupled material model for semi-crystalline polymers

Author

Felder, S., Holthusen, H., Hesseler, S., Pohlkemper, F., Jaan Simon, Gries, T., and Reese, S.

Subjects
Condensed Matter::Materials Science, Finite element method, Plasticity -- Mathematical models, Plasticitat, Elements finits, Mètode dels, Semi-crystalline polymers, Thermo-mechanical coupling, Finite strains, Crystallisation kinetics, Plasticitat -- Models matemàtics, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC]
Abstract

In this work, a thermo-mechanically coupled constitutive model for semicrystalline polymers is derived in a thermodynamically consistent manner. In general, the macroscopic material behaviour of this class of materials is dictated by the underlying microstructure, i.e. by the distribution and structure of crystalline regimes, which form up after cooling from the amorphous melt. In order to account for the latter, the total degree of crystallinity is incorporated as an internal variable and its evolution is prescribed by means of a non-isothermal crystallisation kinetics model. The numerically efficient and robust framework is characterised based on experimental data for Polyamide 6 and shows a promising potential to predict the hyperelastic, visco-plastic material behaviour at various temperatures

Published
2019

21. Strahlenanwendung in der Nasenheilkunde

Author

Bacmeister, A., Bayet, A., Béclère, A., Belot, J., Berven, Elis G. E., Czerny, A., Degrais, P., Forssell, G., Groedel, F., Holfelder, H., Holthusen, H., Jüngling, O., Karger, P., Kraus, Fr., Lahm, W., Lazarus, P., Levy, G., Meldolesi, G., Milani, E., Muir, J., Optiz, E., Parrisius, W., Pinch, A. E. H., Quick, D., Reyn, A., Rollier, A., Schwarz, G., Seitz, L., v. Seuffert, E., Sluys, F., Solomon, I., Werner, R., Wintz, H., Lazarus, Paul, Bacmeister, A., editor, Bayet, A., editor, Béclère, A., editor, Belot, J., editor, Berven, Elis G. E., editor, Czerny, A., editor, Degrais, P., editor, Forssell, G., editor, Groedel, F., editor, Holfelder, H., editor, Holthusen, H., editor, Jüngling, O., editor, Karger, P., editor, Kraus, Fr., editor, Lahm, W., editor, Levy, G., editor, Meldolesi, G., editor, Milani, E., editor, Muir, J., editor, Optiz, E., editor, Parrisius, W., editor, Pinch, A. E. H., editor, Quick, D., editor, Reyn, A., editor, Rollier, A., editor, Schwarz, G., editor, Seitz, L., editor, v. Seuffert, E., editor, Sluys, F., editor, Solomon, I., editor, Werner, R., editor, Wintz, H., editor, and Lazarus, Paul, editor

Published
1931
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22. Strahlenanwendung in der Augenheilkunde

Author

Bacmeister, A., Bayet, A., Béclère, A., Belot, J., Berven, Elis G. E., Czerny, A., Degrais, P., Forssell, G., Groedel, F., Holfelder, H., Holthusen, H., Jüngling, O., Karger, P., Kraus, Fr., Lahm, W., Lazarus, P., Levy, G., Meldolesi, G., Milani, E., Muir, J., Optiz, E., Parrisius, W., Pinch, A. E. H., Quick, D., Reyn, A., Rollier, A., Schwarz, G., Seitz, L., v. Seuffert, E., Sluys, F., Solomon, I., Werner, R., Wintz, H., Lazarus, Paul, Bacmeister, A., editor, Bayet, A., editor, Béclère, A., editor, Belot, J., editor, Berven, Elis G. E., editor, Czerny, A., editor, Degrais, P., editor, Forssell, G., editor, Groedel, F., editor, Holfelder, H., editor, Holthusen, H., editor, Jüngling, O., editor, Karger, P., editor, Kraus, Fr., editor, Lahm, W., editor, Levy, G., editor, Meldolesi, G., editor, Milani, E., editor, Muir, J., editor, Optiz, E., editor, Parrisius, W., editor, Pinch, A. E. H., editor, Quick, D., editor, Reyn, A., editor, Rollier, A., editor, Schwarz, G., editor, Seitz, L., editor, v. Seuffert, E., editor, Sluys, F., editor, Solomon, I., editor, Werner, R., editor, Wintz, H., editor, and Lazarus, Paul, editor

Published
1931
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23. Die biologische Dosierung in der Strahlentherapie der einzelnen Gewebe. Strahlenempfindlichkeit der normalen und pathologischen Gewebe

Author

Holthusen, H., Bacmeister, A., editor, Bayet, A., editor, Béclère, A., editor, Belot, J., editor, Berven, Elis G. E., editor, Czerny, A., editor, Degrais, P., editor, Forssell, G., editor, Groedel, F., editor, Holfelder, H., editor, Holthusen, H., editor, Jüngling, O., editor, Karger, P., editor, Kraus, Fr., editor, Lahm, W., editor, Levy, G., editor, Meldolesi, G., editor, Milani, E., editor, Muir, J., editor, Optiz, E., editor, Parrisius, W., editor, Pinch, A. E. H., editor, Quick, D., editor, Reyn, A., editor, Rollier, A., editor, Schwarz, G., editor, Seitz, L., editor, v. Seuffert, E., editor, Sluys, F., editor, Solomon, I., editor, Werner, R., editor, Wintz, H., editor, and Lazarus, Paul, editor

Published
1931
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31. Besprechungen

Author

Fischer, M. H., Holthusen, H., Bethe, A., Weidenreich, F., Gross, J., and Braun, Fritz

Published
1931
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39. Schmerz.

Author

Schneider, Frank, Fink, Gereon R., Holthusen, H., and Mierdorf, T.

Abstract

Copyright of Funktionelle MRT in Psychiatrie und Neurologie is the property of Springer eBooks and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2007
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