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Nanometer-scale graphene objects are attracting much research interest because of newly emerging properties originating from quantum confinement effects. We present Raman spectroscopy studies of graphene nanoribbons (GNRs) which are known…

Materials Science · Physics 2012-01-23 Sunmin Ryu , Janina Maultzsch , Melinda Y. Han , Philip Kim , Louis E. Brus

Active and passive thermography are two efficient techniques extensively used to measure heterogeneous thermal patterns leading to subsurface defects for diagnostic evaluations. This study conducts a comparative analysis on low-rank matrix…

Image and Video Processing · Electrical Eng. & Systems 2020-10-15 Bardia Yousefi , Clemente Ibarra Castanedo , Xavier P. V. Maldague

A method of using X-ray absorption spectroscopy (XAS) together with resolved grazing incidence geometry for depth profiling atomic, electronic, chemical or magnetic local structures in thin films is presented. The quantitative deconvolution…

We present Raman spectroscopy measurements on single- and few-layer graphene flakes. Using a scanning confocal approach we collect spectral data with spatial resolution, which allows us to directly compare Raman images with scanning force…

Mesoscale and Nanoscale Physics · Physics 2015-06-25 D. Graf , F. Molitor , K. Ensslin , C. Stampfer , A. Jungen , C. Hierold , L. Wirtz

The Method of Light Curve Simulations is a tool that has been applied to X-ray monitoring observations of Active Galactic Nuclei (AGN) for the characterization of the Power Density Spectrum (PDS) of temporal variability and measurement of…

High Energy Astrophysical Phenomena · Physics 2011-02-11 M. Mueller , G. Madejski

Surface enhanced Raman spectroscopy (SERS) is a precise and non-invasive analytical technique that is widely used in chemical analysis, environmental protection, food processing, pharmaceutics, and diagnostic biology. However, it is still a…

We analyzed the X-ray photoemission spectra (XPS) of carbon 1s states in graphene and oxygen-intercalated graphene grown on SiC(0001) using Bayesian spectroscopy. To realize highly accurate spectral decomposition of the XPS spectra, we…

Recently, the combination of robust one-dimensional convolutional neural networks (1-D CNNs) and Raman spectroscopy has shown great promise in rapid identification of unknown substances with good accuracy. Using this technique, researchers…

Computer Vision and Pattern Recognition · Computer Science 2021-06-11 M. Hamed Mozaffari , Li-Lin Tay

Accurate and efficient 3D reconstruction of trees is crucial for forest resource assessments and management. Close-Range Photogrammetry (CRP) is commonly used for reconstructing forest scenes but faces challenges like low efficiency and…

Computer Vision and Pattern Recognition · Computer Science 2024-10-10 Guoji Tian , Chongcheng Chen , Hongyu Huang

Raman spectroscopy is a powerful analytical tool with applications ranging from quality control to cutting edge biomedical research. One particular area which has seen tremendous advances in the past decade is the development of powerful…

Signal Processing · Electrical Eng. & Systems 2020-06-19 M. Hamed Mozaffari , Li-Lin Tay

A series of MnxZn1-xO (x=0.03, 0.05) nanostructures have been grown via the solution based chemical spray pyrolysis technique. Electron beam induced modifications on structural, linear and nonlinear optical and surface morphological…

We demonstrate that GaN formed in a Nanowall Network (NwN) morphology can overcome fundamental limitations in optoelectronic devices, and enable high light extraction and effective Mg incorporation for efficient p-GaN. We report the growth…

Materials Science · Physics 2016-12-01 Sanjay Kumar Nayak , Mukul Gupta , S. M. Shivaprasad

Avoiding charge density fluctuations and impurities in graphene is vital for high-quality graphene-based devices. Traditional characterization methods require device fabrication and electrical transport measurements, which are…

Applied Physics · Physics 2019-08-30 Zhuofa Chen , Nathan Ullberg , Mounika Vutukuru , David Barton , Anna K Swan

In pyrocarbon materials, the width of the Raman D band (FWHMD) is very sensitive to low energy structural defects (e.g., disorientations of the graphene layers). The correlation between the two parameters, FWHMD and OA (as derived from…

Geophysics · Physics 2007-07-03 Jean-Marie Vallerot , Xavier Bourrat , Arnaud Mouchon , Georges Chollon

Recent advances in neural rendering have introduced numerous 3D scene representations. Although standard computer vision metrics evaluate the visual quality of generated images, they often overlook the fidelity of surface geometry. This…

Computer Vision and Pattern Recognition · Computer Science 2026-04-21 Mikolaj Zielinski , Eryk Vykysaly , Bartlomiej Biesiada , Jan Baturo , Mateusz Capala , Dominik Belter

Here we present a combined experimental and theoretical study of graphene nanoribbons (GNRs), where detailed multi-wavelength Raman measurements are integrated by accurate ab initio simulations. Our study covers several ultra-narrow GNRs,…

The importance of ultrasonic nondestructive testing has been increasing in recent years, and there are high expectations for the potential of laser ultrasonic visualization testing, which combines laser ultrasonic testing with scattered…

Computer Vision and Pattern Recognition · Computer Science 2023-05-31 Miya Nakajima , Takahiro Saitoh , Tsuyoshi Kato

Reconstructing three-dimensional (3D) scenes with semantic understanding is vital in many robotic applications. Robots need to identify which objects, along with their positions and shapes, to manipulate them precisely with given tasks.…

Robotics · Computer Science 2024-12-17 Khang Nguyen , Tuan Dang , Manfred Huber

We solve a longstanding problem--determining structural information for disordered materials from their diffraction spectra--for the case of planar disorder in close-packed structures (CPSs). Our solution offers the most complete possible…

Disordered Systems and Neural Networks · Physics 2009-11-07 D. P. Varn , G. S. Canright , J. P. Crutchfield

The atomic and electronic structure of positively charged P vacancies on InP(110) surfaces is determined by combining scanning tunneling microscopy, photoelectron spectroscopy, and density-functional theory calculations. The vacancy…

Materials Science · Physics 2009-10-31 Ph. Ebert , K. Urban , L. Aballe , C. H. Chen , K. Horn , G. Schwarz , J. Neugebauer , M. Scheffler