2019-12-19 11:37 |
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2019-05-09 15:40 |
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2019-05-09 15:19 |
[PUBDB-2019-02229]
Review/Journal Article
Miliani, C. ; Monico, L. ; Melo, M. J. ; et al
Photochemistry of Artists’ Dyes and Pigments: Towards Better Understanding and Prevention of Colour Change in Works of Art
The absorptionof lightgivesapigmentits colourand its reasonforbeing,but it alsocreatesexcitedstates,that is,new moleculeswithanenergyexcessthat can be dissipatedthroughdegradationpathways.Photodegradationprocessesprovokelong-term,cumulativeand irre-versiblecolourchanges(fading,darkening,blanching) of whichthepredictionand preventionare challengingtasks.Ofall the environ-mentalrisksthat affectheritagematerials,light exposureis the onlyone that cannotbe controlledwithoutany impacton the optimaldis-playof the exhibit.Light-inducedalterationsare not onlyassociatedwiththe pigmentitselfbut also withits interactionswithsupport/binderand,in turn,are furthercomplicatedby the natureof the environ-mentalconditions.Inthis Minireviewwe investigatehowchemistry,encompassingmulti-scaleanalyticalinvestigationsof worksof art,computationalmodellingand physicaland chemicalstudiescontrib-utes to improveour predictionof artworkappearancebeforedegra-dationand to establisheffectivepreventiveconservationstrategies..
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2018-07-12 14:27 |
[PUBDB-2018-02586]
Review/Journal Article
Zhang, D. ; Fallahi, A. ; Matlis, N. ; et al
Terahertzstrahlen dirigieren Elektronenpakete
Ultraschnelle Elektronenmikroskope und Röntgenstrahlungsquellen basieren auf beschleunigten und präzise geformten Elektronenpaketen. Unsere Gruppe am DESY konnte kürzlich zeigen, wie mit sehr hochfrequenter Strahlung im Terahertzbereich kompakte Bauelemente für die Elektronenbeschleunigung realisiert und mit leichter Abwandlung auch zur zeitlichen und räumlichen Pulsformung sowie Pulscharakterisierung verwendet werden können..
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2017-12-21 11:46 |
[PUBDB-2017-13944]
Review/Book
Heil, P. ; Aulenbacher, K. ; Beiser, T. ; et al
High Energy Density Irradiation With MAMI LINAC
20178th International Particle Accelerator Conference, IPAC2017, CopenhagenCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19
Geneva : JACoW, J.Phys.Conf.Ser. 874(2017), (2017) [10.18429/JACoW-IPAC2017-TUPAB003]2017
In order to build a positron source for the ILC, a high energy density irradiation is needed to test the used materials. At the MAMI linear accelerator such a radiation can be provided at different electron energies. [...]
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2017-12-18 13:44 |
[PUBDB-2017-13636]
Review/Journal Article
Terraschke, H. ; Rothe, M. J. ; Lindenberg, P.
In situ monitoring metal-ligand exchange processes by optical spectroscopy and X-ray diffraction analysis: a review
Knowledge about the mechanisms involved in the structural development of solid materials at the atomic level is essential for designing rational synthesis protocols for these compounds, which may be used to improve desired technical properties, such as light emission, conductivity, magnetism, porosity or particle size, and may allow the tailored design of solid materials to generate the aforementioned properties. Recent technological advancements have allowed the combination of synchrotron-based in situ X-ray diffraction (XRD) with in situ optical spectroscopy techniques, providing researchers with remarkable opportunities to directly investigate structural changes during synthesis reactions [...]
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2015-04-13 10:46 |
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2014-09-11 10:37 |
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2014-09-11 10:27 |
[PUBDB-2014-03436]
Review/Contribution to a book
Crostack, H.-A. ; Selvadurai, U. ; Tillmann, W. ; et al
Residual stresses in sintered diamond–cobalt composites
2006Materials Science Forum European Conference on Residual Stresses 7, ECRS 7, BerlinBerlin, Germany, 13 Sep 2006 - 15 Sep 20062006-09-132006-09-15
Uetikon : Trans Tech Publ. 524-525, (2006)2006
Manufacturing diamond-cobalt composites by sintering results in residual stresses due tothe mismatch of thermal expansion coefficients mainly. To understand the influence ofmanufacturing process parameters on residual stresses of sintered diamond-cobalt compositessamples are produced by different process parameters. [...]
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2014-09-11 10:16 |
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