Results 161 to 170 of about 9,293 (214)

Resolving the Structural Duality of Graphene Grain Boundaries

Advanced Materials, EarlyView.
Cantilever ncAFM resolves the atomic structure of grain boundaries in graphene, revealing coexisting stable and metastable types. Both contain pentagon/heptagon defects, but metastable GBs show irregular geometries. Modeling shows metastable GBs form under compression, exhibiting vertical corrugation, while stable GBs are flat.
Haojie Guo, Emiliano Ventura‐Macías, Mariano D. Jiménez‐Sánchez, Nicoleta Nicoara, Pierre Mallet, Jean‐Yves Veuillen, Vincent T. Renard, Antonio J. Martínez‐Galera, Pablo Pou, Julio Gómez‐Herrero, Rubén Pérez, Iván Brihuega   +11 more
wiley   +1 more source

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

High Light Utilization and Color Rendering in Vacuum‐Deposited Semitransparent Perovskite Solar Cells

Advanced Materials, EarlyView.
In this work, low bandgap (≈1.55 eV) semitransparent perovskite solar cells (ST‐PSCs) having thin (thickness < ≈100 nm) perovskite layers and transparent conductive oxide‐based rear electrodes are fabricated using vacuum‐deposition methods. Two different ST‐PSCs demonstrated a high light utilization efficiency value of 4.2 (PCE: 9.26% and AVT: 45.3 ...
Abhyuday Paliwal, Manuel Romero, Lennart van den Hengel, Nathan Rodkey, Kassio P. S. Zanoni, Gabriel Lozano, Cristina Roldán‐Carmona, Michele Sessolo, Hernán Míguez, Henk J. Bolink   +9 more
wiley   +1 more source

Flexoelectrically Induced Polar Topology in Twisted SrTiO3 Membranes

Advanced Materials, EarlyView.
Twisted SrTiO3 bilayers host polar vortices of flexoelectric origin, revealed through combined experiment and theory. By reconstructing polarization from the toroidal moment of strain gradients, the work establishes a 3D chiral state with broken inversion and mirror symmetries.
Isabel Tenreiro, Hugo Aramberri, Víctor Rouco, Gabriel Sánchez‐Santolino, Mariona Cabero, Fernando Gallego, David Sánchez‐Manzano, José M. González‐Calbet, Federico Mompeán, Mar García‐Hernández, Alberto Rivera‐Calzada, Jorge Íñiguez‐González, Carlos León, Jacobo Santamaría   +13 more
wiley   +1 more source

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Geometric accuracy of the NewTom 9000 Cone Beam CT

Dentomaxillofacial Radiology, 2005
To determine the geometric accuracy of digital volume tomograms to assess their usability for implant planning.A measuring object with 216 measuring points, whose geometry is exactly known, is X-rayed with a NewTom 9000 cone beam scanner; thereafter the geometry of the volume tomogram of the object is compared with the original body.Considering all ...
R Marmulla, J Mühling, Stefan Hassfeld   +2 more
exaly   +3 more sources

Geometric Accuracy Evaluation of GF-7 Image

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
We selected a scene of “GF-7” satellite multispectral rear-view camera image in Chengdu, Sichuan Province of China. At the same time, we take 26 high-precision GPS sampling points evenly distributed in the region as control points, and make statistics on the geometric positioning accuracy of images.
Guoming Li, Guoqing Li, Tianqing Wang
openaire   +1 more source

The accuracy of geometric approximation of the mammilla in mammograms

International Congress Series, 2003
Abstract The mammilla is an important landmark when judging mammograms. A method of finding the mammilla used by radiologists and within computer-aided mammography is based on the geometrical assumption that the mammilla is located at the point on the breast border that has the furthest distance perpendicular to the pectoralis muscle. This assumption
Fredrik Georgsson, Christina Olsén
openaire   +1 more source

The question of accuracy with geometric camera calibration

2009 Canadian Conference on Electrical and Computer Engineering, 2009
In the field of machine vision, camera calibration refers to the experimental determination of a set of parameters which describe the image formation process for a given analytical model of the machine vision system. An accurate, reliable calibration procedure is essential for most industrial machine vision applications including mechanical metrology ...
Puthukkudichalil Swapna, Nicholas Krouglicof, Ray G. Gosine   +2 more
openaire   +1 more source

Geometric Accuracy of Intravascular Ultrasound Imaging

Journal of the American Society of Echocardiography, 1992
In spite of the current interest in and clinical application of intravascular ultrasound imaging, there is very little published information on the limitations of this modality. In vitro studies on nine phantom vessels (diameter 4.76 to 12.7 mm) and 11 human arteries (diameter 3.7 to 6.2 mm) were performed to assess the potential sources of error of ...
J S, Chae, A F, Brisken, G, Maurer, R J, Siegel   +3 more
openaire   +2 more sources

Accuracy of Geometric Channel-Modeling Methods

IEEE Transactions on Vehicular Technology, 2004
When constructing a propagation channel model, a substitute is often created by giving an arbitrary shape or form to scatterer distributions based on its intuitive appeal for a certain radio environment. However, such models do not necessarily represent the actual propagation process and may yield inaccurate results. The main objective of this paper is
Yifan Chen, Vimal K. Dubey
openaire   +1 more source