Results 41 to 50 of about 1,373 (198)

A soft x-ray polarimeter designed for broadband x-ray telescopes [PDF]

SPIE Proceedings, 2007
A novel approach for measuring linear X-ray polarization over a broad-band using conventional imaging optics and cameras is described. A new type of high efficiency grating, called the critical angle transmission grating is used to disperse soft X-rays radially from the telescope axis.
openaire   +2 more sources

Materials and Music: Selective Imperfection as a Generative Framework for Analysis, Creativity and Discovery

Interdisciplinary Materials, EarlyView.
Vibrations in matter, from spider webs to molecules, water to flames, share a grammar with music. We propose that creativity emerges when constraints force expansion beyond existing possibilities. Selective imperfection restores balance, enabling invention.
Markus J. Buehler
wiley   +1 more source

The Czech Contribution to Future Large X-Ray Astronomy Telescopes: Recent Progress

Acta Polytechnica, 2013
We briefly review the recent status of the Czech contribution to future space X-ray astronomy missions with emphasis on the development of new technologies and test samples of X-ray mirrors with precise surfaces based on new materials and alternative ...
René Hudec, Ladislav Pína, Adolf Inneman, Daniela Černá, Veronika Maršíková, Vladimír Tichý, Martin Míka   +6 more
doaj  

Cis–Trans Rotational Isomerism of Formic Acid, Sulfur, and Selenium Analogues and Their Dimers: Chemical Kinetics Under Interstellar Conditions

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT We present chemical kinetic rate constants for the cis to trans isomerisation or rotamerization of monomeric seleno‐, thio‐, and formic acids and that of three of their dimeric species, based on variational transition state theory and multidimensional tunneling calculations in the gas‐phase, from 10 K to 300 K. These provide, firstly, reliable
Judith Wurmel, John M. Simmie
wiley   +1 more source

Strain‐Release Pentafluorosulfanylation of Carbonyl‐Containing Disubstituted Bicyclobutanes: A Fortuitous Path to SF5‐Containing Oxa[2.1.1]bicyclohexanes

Angewandte Chemie, Volume 138, Issue 34, 17 August 2026.
A regio‐ and diastereoselective method for strain‐release pentafluorosulfanylation of carbonyl‐containing 1,3‐disubstituted [1.1.0]bicyclobutanes (BCBs) was developed that led to several fortuitous discoveries. For instance, the resultant SF5‐cyclobutanes (SF5‐CBs) exhibit close SF5⋯C═X contacts (X = C, N, O) and provide synthetic access to a new class
Alexander M. Stephens, Jake Anthony Olvera, Yannick Kraemer, Tyson Vu, Wang‐Yeuk Kong, Sudiksha Chaturvedi, Jeffrey M. Wang, Lauren M. Holder, Dean J. Tantillo, Cody Ross Pitts   +9 more
wiley   +2 more sources

Czech Participation in International X-Ray Observatory (IXO)

Acta Polytechnica, 2011
Here we describe the recent status of Czech participation in the IXO (International X-ray Observatory) space mission, with emphasis on the development of new technologies and test samples of X-ray mirrors with precise surfaces, based on new materials ...
R. Hudec, L. Pína, V. Maršíková, A. Inneman, M. Skulinová, M. Míka   +5 more
doaj  

Lobster Eye (LE) X-Ray Optics Demonstrator for CubeSats Applications

Photonics
We present a Lobster Eye (LE) X-ray optics module utilizing Multi-Foil Optics (MFO) technology. Designed for CubeSat-class missions, the system is based on the Schmidt arrangement and consists of two orthogonally oriented submodules composed of smooth ...
Veronika Marsikova, Adolf Inneman, Peter Oberta, Ladislav Pina, Rene Hudec   +4 more
doaj   +1 more source

Near‐Infrared Polarimetric Imaging With Nonlinear Flat‐Optics

Laser &Photonics Reviews, EarlyView.
ABSTRACT A compact and broadband polarimetric imaging platform is presented, based on second‐harmonic generation (SHG) in nonlinear flat‐optics. The system employs periodic all‐dielectric AlGaAs gratings to induce polarization‐dependent SH emission, enabling pixel by pixel direct retrieval of the full Stokes vector from an input intensity distribution ...
Evgenii Menshikov, Marco A. López Sánchez, Paolo Franceschini, Andrea Tognazzi, Domenico de Ceglia, Kristina Frizyuk, Costantino De Angelis   +6 more
wiley   +1 more source

A transmissive x-ray polarimeter design for hard x-ray focusing telescopes [PDF]

SPIE Proceedings, 2015
The X-ray Timing and Polarization (XTP) is a mission concept for a future space borne X-ray observatory and is currently selected for early phase study. We present a new design of X-ray polarimeter based on the time projection gas chamber. The polarimeter, placed above the focal plane, has an additional rear window that allows hard X-rays to penetrate (
Li, Hong, Feng, Hua, Ji, Jianfeng, Deng, Zhi, He, Li, Zeng, Ming, Li, Tenglin, Liu, Yinong, Heng, Peiyin, Wu, Qiong, Han, Dong, Dong, Yongwei, Lu, Fangjun, Zhang, Shuangnan   +13 more
openaire   +2 more sources

Controlling the Center of Mass Motion of Levitated Particles Using Structured Wavefronts

Laser &Photonics Reviews, EarlyView.
Optically levitated particles have great potential for quantum‐enhanced sensing. Precise control of the trapping beam is crucial to improve the stability and confinement of these systems. Here, we study how structured wavefronts can be used to control the center‐of‐mass motion of levitated particles, enhancing trap stiffness and enabling stable ...
Shah Jee Rahman, Quimey Pears Stefano, Angel Cifuentes, Jason Francis, Iker Gómez‐Viloria, Ruben Pellicer‐Guridi, Miguel Varga, Gabriel Molina‐Terriza   +7 more
wiley   +1 more source