Results 71 to 80 of about 51,201 (322)

Improved models of upper-level wind for several astronomical observatories

, 2010
An understanding of wind speed and direction as a function of height are critical to the proper modeling of atmospheric turbulence. We have used radiosonde data from launch sites near significant astronomical observatories and created mean profiles of ...
Bely, Bufton, Carrasco, Chueca, Fesen, García-Lorenzo, Greenwood, L. William Bradford, Lewis C. Roberts, Jr., Muñoz-Tuñón, Parenti, Seigar, Skidmore, Taylor, Walters, Wilson   +15 more
core   +1 more source

Self‐Powered Flexible Triboelectric‐Gated Ion‐Gel Transistor for Neuromorphic Tactile Sensing and Human Activity Recognition

Advanced Materials, EarlyView.
A fully flexible ion‐gel‐gated graphene‐channel transistor driven by a triboelectric nanogenerator enables self‐powered tactile sensing and synaptic learning. Mimicking spike‐rate‐dependent plasticity, the device exhibits frequency‐selective potentiation and depression, supporting rate‐coded neuromorphic computation even under flex.
Hanseong Cho, Seoyeon Park, Youngmin Lee, Sejoon Lee   +3 more
wiley   +1 more source

Astronomical demonstration of an optical vortex coronagraph

Optics Express, 2008
Using an optical vortex coronagraph and simple adaptive optics techniques, we have made the first convincing demonstration of an optical vortex coronagraph that is coupled to a star gazing telescope. We suppressed by 97% the primary star of a resolvable binary system, Cor Caroli. The stars had an angular separation of 1.9lambda/D at our imaging camera.
Grover A, Swartzlander, Erin L, Ford, Rukiah S, Abdul-Malik, Laird M, Close, Mary A, Peters, David M, Palacios, Daniel W, Wilson   +6 more
openaire   +2 more sources

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source

Characterization of integrated optics components for the second generation of VLTI instruments

, 2008
Two of the three instruments proposed to ESO for the second generation instrumentation of the VLTI would use integrated optics for beam combination. Several design are studied, including co-axial and multi-axial recombination.
Benisty, M., Berger, J. -P., Delboulbe, A., Haubois, X., Herwats, E., Jocou, L., Kern, P. Y., Labeye, P. R., Lacour, S., Malbet, F., Moulin, T., Perrin, G., Rousselet-Perraut, K.   +12 more
core   +2 more sources

Versatile Magneto‐Dielectric Response of Epitaxial Thin Films of the High Entropy Oxide Perovskite Nd(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3

Advanced Materials, EarlyView.
The magnetic high entropy oxide perovskite Nd(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 exhibits a substantially large dielectric constant (εr) at room temperature, which shows distinct anionic and cationic contributions in the form of zero and finite bias peaks, respectively, down to its magnetic transition temperature (Tmag).
Roxana Capu, Ryan Thompson, C. Willem Rischau, Marli R. Cantarino, Premysl Marsik, Sergey L. Bud'ko, Neven Biškup, María Varela, Yurii G. Pashkevich, Serhii M. Orel, Thomas Prokscha, Andreas Suter, Jiangtao Zhao, Ugwumsinachi Oji, Marco Bonura, Peter Bencok, Zaher Salman, Stefano Gariglio, Christian Bernhard, Subhrangsu Sarkar   +19 more
wiley   +1 more source

A Single Waveguide Spectrometer via Defect Scattering

IEEE Photonics Journal
Miniaturized spectrometers show great application potential in biology, medicine, astronomy and so on. However, it is still challenging to obtain broadband spectrum and high spectral resolution simultaneously with limited size. In this study, we proposed
Xue Tong, Zhenning Zhao, Yunxian Zhong, Dong Lin, Zhuangzhuang Zhu, Qing Zhong, Jinping He   +6 more
doaj   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

Astrometric Calibration of MagAO-X with Updated Solutions for HD 165054 Field Stars

The Astronomical Journal
MagAO-X is a recently commissioned extreme adaptive optics instrument for the Magellan Clay 6.5 m telescope at Las Campanas Observatory in Chile. MagAO-X had first light in 2019 and subsequent commissioning observations in 2022 and 2023.
Joseph D. Long, Logan Pearce, Sebastiaan Y. Haffert, Jared R. Males, Laird M. Close, Olivier Guyon, Warren B. Foster, Kyle Van Gorkom, Alexander D. Hedglen, Maggie Y. Kautz, Jay K. Kueny, Jialin Li, Jennifer Lumbres, Eden A. McEwen, Avalon L. McLeod, Lauren Schatz   +15 more
doaj   +1 more source

GRAVITY: getting to the event horizon of Sgr A*

, 2008
We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motions of matter close to the event horizon of Sgr A*, the massive black hole ...
Bartko, H., Baumeister, H., Berger, J. P., Boehm, A., Brandner, W., Cassaing, F., Clenet, Y., Dodds-Eden, K., Eckart, A., Eisenhauer, F., Fedou, P., Gendron, E., Genzel, R., Gillessen, S., Graeter, A., Hamaus, N., Haubois, X., Haug, M., Henning, T., Hippler, S., Hofmann, R., Hormuth, F., Houairi, K., Jocou, L., Kellner, S., Kervella, P., Klein, R., Kolmeder, J., Lacour, S., Laun, W., Lenzen, R., Malbet, F., Naranjo, V., Neumann, U., Paumard, T., Perraut, K., Perrin, G., Pfuhl, O., Rabien, S., Ramos, J. R., Richichi, A., Rohloff, R. -R., Rouan, D., Rousset, G., Schoeller, M., Straubmeier, C., Thiel, M., Ziegleder, J.   +47 more
core   +2 more sources