نتایج جستجو برای: multilayered structures

تعداد نتایج: 460170  

Journal: :Journal of the American Chemical Society 2010
Dieter Gross Iván Mora-Seró Thomas Dittrich Abdelhak Belaidi Christian Mauser Arjan J Houtepen Enrico Da Como Andrey L Rogach Jochen Feldmann

Charge separation and diffusion in type II multilayered structures of CdTe and CdSe nanocrystals with a polymer spacer are unambiguously proven by surface photovoltage spectroscopy. Holes accumulate in CdTe nanocrystal layers, and the electrons in CdSe nanocrystal layers. An increase of thickness of the polymer spacer strongly decreases the charge separation efficiency. Surface photovoltage tra...

Journal: :IEEE transactions on image processing : a publication of the IEEE Signal Processing Society 1998
François G. Meyer Amir Averbuch Jan-Olov Strömberg Ronald R. Coifman

The main contribution of this work is a new paradigm for image representation and image compression. We describe a new multilayered representation technique for images. An image is parsed into a superposition of coherent layers: piecewise smooth regions layer, textures layer, etc. The multilayered decomposition algorithm consists in a cascade of compressions applied successively to the image it...

Journal: :SPE polymers 2021

Poly(vinylidene fluoride) (PVDF) based composites loaded with 3 wt% of carbon black (CB), graphite (GF), and the hybrid CB/GF (1.5/1.5 wt%) were prepared by melt mixing tested as microwave absorbing material at X-band frequencies (8–12 GHz). The materials processed pressed 220°C into plates 20 × 0.1 cm3. Dielectric magnetic properties evaluated using wave-guide accessory to simulate reflectivit...

Journal: :Optical Materials 2021

We design, optimize, fabricate, and characterize highly reflective quasi-omnidirectional multilayered structures with a wide angular spectral range. consider chirped layers of gradually varying thicknesses made by stacking Bragg-type sub-structures, we maximized their numerically calculated reflectance averaged over different ranges keeping minimum thickness for given pairs refractive indices. ...

Journal: :Acta medica 2010
Jana Karbanová Tomás Soukup Jakub Suchánek Jaroslav Mokrý

Dental pulp stem cells (DPSCs) can be easily isolated and cultured in low-serum containing medium supplemented with growth factors PDGF-BB and EGF while exhibiting multipotency and immature phenotypic characteristics. In the present study, we investigated their potential to differentiate towards osteogenic lineages using various culture conditions in order to optimize their therapeutic use. DPS...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Benjamin Hatton Lidiya Mishchenko Stan Davis Kenneth H Sandhage Joanna Aizenberg

Whereas considerable interest exists in self-assembly of well-ordered, porous "inverse opal" structures for optical, electronic, and (bio)chemical applications, uncontrolled defect formation has limited the scale-up and practicality of such approaches. Here we demonstrate a new method for assembling highly ordered, crack-free inverse opal films over a centimeter scale. Multilayered composite co...

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