Results 71 to 80 of about 209,601 (301)

Resonance Fluorescence of Fused Silica by the Depopulation of the Ground State

International Journal of Photoenergy, 2012
Spectroscopically pure fused silica has been used in many applications ranging from optoelectronics and optical fibers to laser flash spectroscopy. Although ultraviolet light irradiated optical absorption spectra and coherence fluorescence of silicon ...
Fuat Bayrakceken, Korkut Yegin
doaj   +1 more source

Measurement of the small-scale structure of the intergalactic medium using close quasar pairs

, 2017
The distribution of diffuse gas in the intergalactic medium (IGM) imprints a series of hydrogen absorption lines on the spectra of distant background quasars known as the Lyman-$\alpha$ forest.
Hennawi, Joseph F., Kulkarni, Girish, Lee, Khee-Gan, Lukić, Zarija, Oñorbe, Jose, Prochaska, J. Xavier, Rorai, Alberto, Walther, Michael, White, Martin   +8 more
core   +1 more source

Photoswitchable Conductive Metal–Organic Frameworks

Advanced Functional Materials, EarlyView.
A conductive material where the conductivity can be modulated remotely by irradiation with light is presented. It is based on films of conductive metal–organic framework type Cu3(HHTP)2 with embedded photochromic molecules such as azobenzene, diarylethene, spiropyran, and hexaarylbiimidazole in the pores.
Yidong Liu, Mersad Mostaghimi, Abhinav Chandresh, Saibal Jana, Wolfgang Wenzel, Lars Heinke   +5 more
wiley   +1 more source

The heavily polluted atmosphere of the DAZ white dwarf GALEX J193156.8+011745 [PDF]

, 2010
We report on the discovery of a new heavily polluted white dwarf. The DAZ white dwarf GALEX J193156.8+011745 was identified in a joint GALEX/GSC survey of ultraviolet-excess objects.
A. Kawka, Alcock, Benvenuto, Brinkworth, Burleigh, Debes, Debes, Farihi, Fontaine, Grevesse, Gänsicke, Gänsicke, Hogg, Holberg, Hubeny, Johnson, Jura, Kawka, Kilic, Kirkpatrick, Klein, Koester, Koester, Lanz, Lodders, Martín, Maxted, Montmerle, Morrissey, Ochsenbein, P. Németh, S. Vennes, Schlegel, Skrutskie, Steele, Wesemael, Zuckerman, Zuckerman   +37 more
core   +3 more sources

Intermolecular Interactions as Driving Force of Increasing Multiphoton Absorption in a Perylene Diimide‐Based Coordination Polymer

Advanced Functional Materials, EarlyView.
This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger, Anna Mauri, Yang Cui, Sebastian Josef Weishäupl, Ali Deniz Özdemir, Hamad Syed, Aleksandr Ovsianikov, Wolfgang Wenzel, Alexander Pöthig, Jürgen Hauer, Mariana Kozlowska, Roland Augustinus Fischer   +11 more
wiley   +1 more source

AVALIAÇÃO ESPECTROFOTOMÉTRICA DAS FORMAS CR+3, CRO4 -2 E CR2O7 -2

Eclética Química, 2018
A spectrophometric study of the speciation of the chemical forms Cr+3, CrO4-2 and Cr2O7-2 was carried out on a wide interval of pH (from 2,0 to 12,0) in a Britton-Robinson buffer solution. The absorption spectra of the ultraviolet and visible regions are
Leonardo de Sá Costa, Francisco Régis da Silva Pereira, Robson Fernandes de Farias, Francisco Claudece Pereira   +3 more
doaj   +1 more source

Energy transfer from retinal to amino acids — a time-resolved study of the ultraviolet emission of bacteriorhodopsin [PDF]

, 1986
Two-step excitation of retinal in bacteriorhodopsin by visible light is followed by an energy transfer to amino acids that is seen as fluorescent emission around 350 nm.
Franz, M. A., Kaiser, Wolfgang, Oesterhelt, Dieter, Polland, Hans-Joachim, Zinth, Wolfgang   +4 more
core   +1 more source

Dual‐Mode Film Based on Highly Scattering Nanofibers and Upcycled Chips‐Bags for Year‐Round Thermal Management

Advanced Functional Materials, EarlyView.
Intelligent radiative cooling devices, adaptable to various weather conditions, have the potential for year‐round energy savings. This study introduces a sustainable dual‐mode film made from polycaprolactone nanofibers and upcycled chip bags for effective thermal management.
Qimeng Song, Stefan Rettinger, Chengzhang Xu, Ulrich Mansfeld, Markus Retsch   +4 more
wiley   +1 more source

Wide range optical studies on transparent SWNT films [PDF]

, 2004
We present transmission spectra from the far infrared through the ultraviolet region on freestanding SWNT films at temperatures between 40 and 300 K. Several interesting features are observed in the low-frequency part of the spectrum: the Drude-like ...
Borondics, Ferenc, Chen, Z., Kamarás, Katalin, Nikolou, M., Rinzler, A. G., Tanner, D. B.   +5 more
core   +1 more source

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

Advanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner, Ruben Maile, Murat Cuvalli, Andreas Wolf, Ayisha Komal, Robert Oestreich, Christoph Janiak, Karl Mandel, Alexander Knebel, Klaus Müller‐Buschbaum   +9 more
wiley   +1 more source