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Your search keyword '"van Langh, R."' showing total 12 results
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12 results on '"van Langh, R."'

3. Hercules' head

Author

Van Langh, R. and Wassink, J.

Subjects
scanning, bronze
Abstract

Neutron beams are much more suitable than X-rays for scanning bronze statues. Good news for our art collections?

Published
2012

5. The study of bronze statuettes with the help of neutron-imaging techniques

Author

Van Langh, R. (author), Lehmann, E. (author), Hartmann, S. (author), Kaestner, A. (author), Scholten, F. (author), Van Langh, R. (author), Lehmann, E. (author), Hartmann, S. (author), Kaestner, A. (author), and Scholten, F. (author)

Abstract

Until recently fabrication techniques of Renaissance bronzes have been studied only with the naked eye, microscopically, videoscopically and with X-radiography. These techniques provide information on production techniques, yet much important detail remains unclear. As part of an interdisciplinary study of Renaissance bronzes undertaken by the Rijksmuseum Amsterdam, neutron-imaging techniques have been applied with the aim of obtaining a better understanding of bronze workmanship during the Renaissance period. Therefore, an explanation of the fabrication techniques is given to better understand the data collected by these neutron-imaging techniques. The data was used for tomography studies, which reveal hidden aspects that could not at all or scarcely be seen using X-radiography. For this specific study, the representative bronze ‘Hercules Pomarius’ of Willem van Tetrode (ca 1520–1588) has been examined, along with 20 other Renaissance bronzes from the Rijksmuseum collection., Materials Science and Engineering, Mechanical, Maritime and Materials Engineering

Published
2009

7. OS04F125 Modern and Historical Engineering Concerns Investigated by Neutron Diffraction

Author

Paradowska, A. M., primary, Tremsin, A., additional, Kelleher, J. F., additional, Zhang, S. Y., additional, Paddea, S., additional, Burca, G., additional, James, J. A., additional, Rehan, A., additional, Faisal, N. H., additional, Grazzi, F., additional, Festa, G., additional, Andreani, C., additional, Civita, F., additional, Bouchard, P. J., additional, Kockelman, W., additional, van Langh, R., additional, and Fitzpatrick, M. E., additional

Published
2011
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8. The Copper CHARM Set: A New Set of Certified Reference Materials for the Standardization of Quantitative X-Ray Fluorescence Analysis of Heritage Copper Alloys*.

Author

Heginbotham, A., Bassett, J., Bourgarit, D., Eveleigh, C., Glinsman, L., Hook, D., Smith, D., Speakman, R. J., Shugar, A., and Van Langh, R.

Subjects
COPPER alloys, X-ray fluorescence, CULTURAL property, CALIBRATION, QUANTITATIVE research
Abstract

This paper introduces a new set of certified reference materials designed to aid scientists and conservators working in cultural heritage fields with quantitative X-ray fluorescence analysis of historical and prehistoric copper alloys. This set has been designated as the Copper CHARM Set (Cultural Heritage Alloy Reference Material Set). The Copper CHARM Set is designed to be used by a wide range of museum-, art- and archaeology-oriented scientists and conservators to help improve the accuracy and range of their calibrations for quantitative ED- XRF spectrometry of copper alloys, and also increase the number of elements that can routinely be quantified. In addition, the common use of a single core set of the reference materials is designed to significantly improve inter-laboratory reproducibility, allowing greater data sharing between researchers and thus furthering possibilities for collaborative study. [ABSTRACT FROM AUTHOR]

Published
2015
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9. Examination of Greek bronze helmets: sampling and project design

Author

Degrigny, C., van Langh, R., Joosten, I., Ankersmit, B., Manti, Panagiota, Watkinson, David, Degrigny, C., van Langh, R., Joosten, I., Ankersmit, B., Manti, Panagiota, and Watkinson, David

Abstract

Difficulties met when requesting invasive sampling of museum objects are described and strategies for successful applications are offered. The paper focuses on experiences during sample collection for a project to analyse early Greek copper alloy helmets. This project will examine in a later stage, helmet compositions and surface coatings then link this to original appearance and manufacturing technologies.

10. Preservation of historical buildings: understanding of corrosion mechanisms of metallic rebars in concrete

Author

Neff, Delphine, Elisabeth, Marie-Victoire, L'Hostis, Valerie, Cailleux, Emmanuel, Vincent, Laurent, Texier, Annick, Bellot-Gurlet, Ludovic, Dillmann, Philippe, Laboratoire Pierre Süe (LPS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de recherche des monuments historiques (LRMH), Centre de Recherche sur la Conservation (CRC ), Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Comportement des Bétons et des Argiles (LECBA), Service d'Etudes du Comportement des Radionucléides (SECR), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Physico-Chimie (DPC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture et de la Communication (MCC)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture et de la Communication (MCC), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS), Degrigny C., van Langh R., Joosten I., and Ankersmit B.

Subjects
Corrosion, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Iron, Raman spectroscopy, [CHIM.MATE]Chemical Sciences/Material chemistry, [SPI.GCIV.MAT]Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction, Concrete, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Numerous monuments of the 20th century made of reinforced concrete are decaying due to the corrosion of their metallic reinforcements, the growth of the corrosion products generally inducing spalling. In order to prevent these degradations before the concrete cracks, it would be interesting to determine by non destructive methods the state of corrosion of the embedded rebars. Three types of corrosion forms have been evidenced on samples collected on three monuments: first is original and contains wüstite, the second is a mixture of the first and thicker layers containing oxy-hydroxides, characteristic of the third type

Published
2008

11. The long term indoor atmospheric corrosion of iron: rust layer characterisation

Author

Monnier, Judith, Bellot-Gurlet, Ludovic, Legrand, Ludovic, Dillmann, Philippe, Reguer, Solenn, Neff, Delphine, Guillot, Ivan, Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Pierre Süe (LPS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Dynamique Interactions et Réactivité (LADIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement (LAMBE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Évry-Val-d'Essonne (UEVE)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS), Division Expériences - DIFFABS Synchrotron Soleil (Synchrotron Soleil), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Degrigny C., van Langh R., Joosten I., Ankersmit B., Bellot-Gurlet, Ludovic, Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)

Subjects
Corrosion, [CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, Iron corrosion, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Raman spectroscopy, Electrochemistry, Indoor atmospheric corrosion, [CHIM.MATE]Chemical Sciences/Material chemistry, Ancient iron artefacts, Synchrotron
Abstract

International audience; The study of long term indoor atmospheric corrosion is involved in the field of iron bearing in building heritage. Concerning historical artefacts, due to the complexity of the system, it is necessary to couple many analytical techniques from the macro to the microscopic scale. This enables a schematisation of the Amiens cathedral chains rust layer, constituted of a matrix of goethite, with lepidocrocite locally present in the rust layer and marblings of a poor crystallised phase associated to ferrihydrite. The reduction capacity of the rust layer has also been studied using electrochemical methods.

Published
2007

12. Reflectance Imaging Spectroscopy (RIS) for Operation Night Watch : Challenges and Achievements of Imaging Rembrandt's Masterpiece in the Glass Chamber at the Rijksmuseum.

Author

Gabrieli F, Delaney JK, Erdmann RG, Gonzalez V, van Loon A, Smulders P, Berkeveld R, van Langh R, and Keune K

Subjects
Algorithms, Diagnostic Imaging, Glass, Spectrum Analysis, Paintings
Abstract

Visible and infrared reflectance imaging spectroscopy is one of the several non-invasive techniques used during Operation Night Watch for the study of Rembrandt's iconic masterpiece The Night Watch (1642). The goals of this project include the identification and mapping of the artists' materials, providing information about the painting technique used as well as documenting the painting's current state and ultimately determining the possible conservation plan. The large size of the painting (3.78 m by 4.53 m) and the diversity of the technical investigations being performed make Operation Night Watch the largest research project ever undertaken at the Rijksmuseum. To construct a complete reflectance image cube at a high spatial resolution (168 µm 2 ) and spectral resolution (2.54 to 6 nm), the painting was imaged with two high-sensitivity line scanning hyperspectral cameras (VNIR 400 to 1000 nm, 2.54 nm, and SWIR 900 to 2500 nm, 6 nm). Given the large size of the painting, a custom computer-controlled 3-D imaging frame was constructed to move each camera, along with lights, across the painting surface. A third axis, normal to the painting, was added along with a distance-sensing system which kept the cameras in focus during the scanning. A total of 200 hyperspectral image swaths were collected, mosaicked and registered to a high-resolution color image to sub-pixel accuracy using a novel registration algorithm. The preliminary analysis of the VNIR and SWIR reflectance images has identified many of the pigments used and their distribution across the painting. The SWIR, in particular, has provided an improved visualization of the preparatory sketches and changes in the painted composition. These data sets, when combined with the results from the other spectral imaging modalities and paint sample analyses, will provide the most complete understanding of the materials and painting techniques used by Rembrandt in The Night Watch .

Published
2021
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