2,082 research outputs found
Printable Nanoscopic Metamaterial Absorbers and Images with Diffraction-Limited Resolution
The fabrication of functional metamaterials with extreme feature resolution
finds a host of applications such as the broad area of surface/light
interaction. Non-planar features of such structures can significantly enhance
their performance and tunability, but their facile generation remains a
challenge. Here, we show that carefully designed out-of-plane nanopillars made
of metal-dielectric composites integrated in a metal-dielectric-nanocomposite
configuration, can absorb broadband light very effectively. We further
demonstrate that electrohydrodynamic printing in a rapid nanodripping mode, is
able to generate precise out-of-plane forests of such composite nanopillars
with deposition resolutions at the diffraction limit on flat and non-flat
substrates. The nanocomposite nature of the printed material allows the
fine-tuning of the overall visible light absorption from complete absorption to
complete reflection by simply tuning the pillar height. Almost perfect
absorption (~95%) over the entire visible spectrum is achieved by a nanopillar
forest covering only 6% of the printed area. Adjusting the height of individual
pillar groups by design, we demonstrate on-demand control of the gray scale of
a micrograph with a spatial resolution of 400 nm. These results constitute a
significant step forward in ultra-high resolution facile fabrication of
out-of-plane nanostructures, important to a broad palette of light design
applications. nanostructures, important to a broad palette of light design
applications
Stellar intensity interferometry: Experimental steps toward long-baseline observations
Experiments are in progress to prepare for intensity interferometry with
arrays of air Cherenkov telescopes. At the Bonneville Seabase site, near Salt
Lake City, a testbed observatory has been set up with two 3-m air Cherenkov
telescopes on a 23-m baseline. Cameras are being constructed, with control
electronics for either off- or online analysis of the data. At the Lund
Observatory (Sweden), in Technion (Israel) and at the University of Utah (USA),
laboratory intensity interferometers simulating stellar observations have been
set up and experiments are in progress, using various analog and digital
correlators, reaching 1.4 ns time resolution, to analyze signals from pairs of
laboratory telescopes.Comment: 12 pages, 3 figur
Full-Spectrum Flexible Color Printing at the Diffraction Limit
Color printing at the diffraction limit has been recently explored by
fabricating nanoscale plasmonic structures with electron beam lithography.
However, only a limited color range and constant intensity throughout the
structure have been demonstrated. Here we show an alternative, facile approach
relying on the direct, open-atmosphere electrohydrodynamic rapid nanodrip
printing of controlled amounts of red, green and blue (RGB) quantum dots at a
resolution of 250 nm. The narrow emission spectrum of the dots allows the
coverage of a very broad color space, exceeding standard RGB (sRGB) of modern
display devices. We print color gradients of variable intensity, which to date
could not be achieved with diffraction-limited resolution. Showcasing the
capabilities of the technology, we present a photo-realistic printed image of a
colorful parrot with a pixel size of 250 nm
Real‐world data of 12‐month adjunct sodium‐glucose co‐transporter‐2 inhibitor treatment in type 1 diabetes from the German/Austrian DPV registry: Improved HbA1c without diabetic ketoacidosis
Multiscale methods for the solution of the Helmholtz and Laplace equations
This paper presents some numerical results about applications of multiscale techniques to boundary integral equations. The numerical schemes developed here are to some extent based on the results of the papers [6]—[10]. Section 2 deals with a short description of the theory of generalized Petrov-Galerkin methods for elliptic periodic pseudodifferential equations in covering classical Galerkin schemes, collocation, and other methods. A general setting of multiresolution analysis generated by periodized scaling functions as well as a general stability and convergence theory for such a framework is outlined. The key to the stability analysis is a local principle due to one of the authors. Its applicability relies here on a sufficiently general version of a so-called discrete commutator property of wavelet bases (see [6]). These results establish important prerequisites for developing and analysing methods for the fast solution of the resulting linear systems (Section 2.4). The crucial fact which is exploited by these methods is that the stiffness matrices relative to an appropriate wavelet basis can be approximated well by a sparse matrix while the solution to the perturbed problem still exhibits the same asymptotic accuracy as the solution to the full discrete problem. It can be shown (see [7]) that the amount of the overall computational work which is needed to realize a required accuracy is of the order , where is the number of unknowns and is some real number
ЗАЛЕЖНІСТЬ ПРИРОСТУ ПРИБУТКУ ШАХТИ ВІД ПРИРОСТУ ВИДОБУТКУ ВУГІЛЛЯ ПРИ ПРОВЕДЕННІ ШТРЕКІВ ШИРОКИМ ВИБОЄМ
Розглянуто питання впливу чинників на ефективність проведення виробок широким вибоєм. Визначено приріст видобутку вугілля на прибуток шахти.; Influence of factors on efficiency of leadthrough of making a wide b ackwall is considered. Increase of coal production on the income of mine is analyzed
Measurement of the magnetic moment of single Magnetospirillum gryphiswaldense cells by magnetic tweezers
Magnetospirillum gryphiswaldense is a helix-shaped magnetotactic bacterium that synthesizes ironoxide nanocrystals, which allow navigation along the geomagnetic field. The bacterium has already been thoroughly investigated at the molecular and cellular levels. However, the fundamental physical property enabling it to perform magnetotaxis, its magnetic moment, remains to be elucidated at the single cell level. We present a method based on magnetic tweezers; in combination with Stokesian dynamics and Boundary Integral Method calculations, this method allows the simultaneous measurement of the magnetic moments of multiple single bacteria. The method is demonstrated by quantifying the distribution of the individual magnetic moments of several hundred cells of M. gryphiswaldense. In contrast to other techniques for measuring the average magnetic moment of bacterial populations, our method accounts for the size and the helical shape of each individual cell. In addition, we determined the distribution of the saturation magnetic moments of the bacteria from electron microscopy data. Our results are in agreement with the known relative magnetization behavior of the bacteria. Our method can be combined with single cell imaging techniques and thus can address novel questions about the functions of components of the molecular magnetosome biosynthesis machinery and their correlation with the resulting magnetic moment
Why so serious? Theorising playful model-driven group decision support with situated affectivity
This is the author accepted manuscript. The final version is available from Springer via the DOI in this record.An integrative approach to theorising behavioural, affective and cognitive processes in modeldriven
group decision support (GDS) interventions is needed to gain insight into the (micro-)processes
by which outcomes are accomplished. This paper proposes that the theoretical lens of situated
affectivity, grounded in recent extensions of scaffolded mind models, is suitable to understand the
performativity of affective micro-processes in model-driven GDS interventions. An illustrative vignette
of a humorous micro-moment in a group decision workshop is presented to reveal the performativity of
extended affective scaffolding processes for group decision development. The lens of situated
affectivity constitutes a novel approach for the study of interventionist practice in the context of group
decision making (and negotiation). An outlook with opportunities for future research is offered to
facilitate an integrated approach to the study of cognitive-affective and behavioural micro-processes in
model-driven GDS interventions.This work was supported in part by the EU FP7-ENERGY- SMARTCITIES-2012
(314277) project STEEP (Systems Thinking for Comprehensive City Efficient Energy Planning
European and multi-ancestry genome-wide association meta-analysis of atopic dermatitis highlights importance of systemic immune regulation
Atopic dermatitis (AD) is a common inflammatory skin condition and prior genome-wide association studies (GWAS) have identified 71 associated loci. In the current study we conducted the largest AD GWAS to date (discovery N = 1,086,394, replication N = 3,604,027), combining previously reported cohorts with additional available data. We identified 81 loci (29 novel) in the European-only analysis (which all replicated in a separate European analysis) and 10 additional loci in the multi-ancestry analysis (3 novel). Eight variants from the multi-ancestry analysis replicated in at least one of the populations tested (European, Latino or African), while two may be specific to individuals of Japanese ancestry. AD loci showed enrichment for DNAse I hypersensitivity and eQTL associations in blood. At each locus we prioritised candidate genes by integrating multi-omic data. The implicated genes are predominantly in immune pathways of relevance to atopic inflammation and some offer drug repurposing opportunities.</p
- …