0000000000548056

AUTHOR

Manish Kumar

showing 3 related works from this author

Klimt artwork: red-pigment material investigation by backscattering Fe-57 Mössbauer spectroscopy, SEM and p-XRF

2017

Material tests were performed on a rediscovered Klimt-artwork "Trompetender Putto". We performed studies on the red colored spots, mainly taken from non-restored parts. MIMOS II Fe-57 Mossbauer spectroscopy (novelty in art-pigment analysis) mainly reveals haematite and crystallized goethite in red colors. Electron microscopy can identify various layers of the original and overpainting of an artwork. The number of layers fluctuates between three and four chemically painted areas. The portable X-ray fluorescence analysis enables to reduce the pigment list to containing mercury (cinnabar), lead, zinc, iron and titanium. Infrared-light-irradiation visualizes the different age of the pigments.

Dewey Decimal Classification::500 | Naturwissenschaften::540 | ChemieArcheologyGoethiteMaterials scienceScanning electron microscopepigmentsAnalytical chemistryinfra-red-light investigationchemistry.chemical_elementZinc01 natural sciencesKlimt: “Trompetender Putto”PigmentMaterialcharakterisierung0103 physical sciencesMössbauer spectroscopy0601 history and archaeologyddc:750lcsh:CC1-960010306 general physics060102 archaeologyTrompetender PuttoMössbauer spectroscopy06 humanities and the artsDewey Decimal Classification::700 | Künste Bildende Kunst allgemein::750 | MalereiOverpaintingKlimt GustavDewey Decimal Classification::700 | Künste Bildende Kunst allgemeinCinnabarchemistryPigmentvisual_artddc:540visual_art.visual_art_mediumddc:660lcsh:ArchaeologyX-ray fluorescence analysisddc:700660 Technische Chemiescanning electron microscopyTitanium
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An Efficient Immunization Strategy Using Overlapping Nodes and Its Neighborhoods

2018

International audience; When an epidemic occurs, it is often impossible to vaccinate the entire population due to limited amount of resources. Therefore, it is of prime interest to identify the set of influential spreaders to immunize, in order to minimize both the cost of vaccine resource and the disease spreading. While various strategies based on the network topology have been introduced, few works consider the influence of the community structure in the epidemic spreading process. Nowadays, it is clear that many real-world networks exhibit an overlapping community structure, in which nodes are allowed to belong to more than one community. Previous work shows that the numbers of communit…

Connected componentSocial networkbusiness.industryComputer scienceCommunity structureOverlapping CommunitySLPANetwork topology01 natural sciencesPrime (order theory)010305 fluids & plasmasResource (project management)Betweenness centrality0103 physical sciencesNode (computer science)Largest Connected ComponentSocial NetworkImmunization[INFO]Computer Science [cs]010306 general physicsbusinessComputer network
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Acidic Co-Catalysts in Cationic Gold Catalysis.

2016

A systematic study on the effects of Lewis or Bronsted acid co-catalysts in gold-catalyzed reactions was undertaken using representative reactions (O-, N-, and C-nucleophilic additions to alkynes). Through these reactions, it was demonstrated that an acidic co-catalyst can increase the catalyst turnover significantly, enabling practical reaction rates at competitive catalyst loadings (<1 mol %). Further investigation is currently underway to improve the understanding of the subtle principles underlying these experimental observations.

inorganic chemicals010405 organic chemistryChemistryorganic chemicalsOrganic ChemistryCationic polymerizationGeneral Chemistry010402 general chemistry01 natural sciencesCatalysis0104 chemical sciencesCatalysisReaction rateTransition metalOrganic chemistryheterocyclic compoundsLewis acids and basesBrønsted–Lowry acid–base theoryChemistry (Weinheim an der Bergstrasse, Germany)
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