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19 papers · 1 filter
Total reflection and transmission by epsilon-near-zero metamaterials with defects
Yadong Xu, Huanyang Chen
In this work, we investigate wave transmission through an epsilon-near-zero metamaterial waveguide embedded with defects. We show that by adjusting the geometric sizes and material…
Negative Power Spectra in Quantum Field Theory
Jen-Tsung Hsiang, Chun-Hsien Wu, L. H. Ford
We consider the spatial power spectra associated with fluctuations of quadratic operators in field theory, such as quantum stress tensor components. We show that the power spectrum…
Calibrating the atomic balance by carbon nanoclusters
Fengqi Song, Xuefeng Wang, Rebecca C. Powles +9
Carbon atoms are counted at near atomic-level precision using a scanning transmission electron microscope calibrated by carbon nanocluster mass standards. A linear calibration curv…
Efficient Optimization of Performance Measures by Classifier Adaptation
Nan Li, Ivor W. Tsang, Zhi-Hua Zhou
In practical applications, machine learning algorithms are often needed to learn classifiers that optimize domain specific performance measures. Previously, the research has focuse…
Rotational and Translational Phonon Modes in Glasses Composed of Ellipsoidal Particles
Peter J. Yunker, Ke Chen, Zexin Zhang +3
The effects of particle shape on the vibrational properties of colloidal glasses are studied experimentally. 'Ellipsoidal glasses' are created by stretching polystyrene spheres to…
Anti-mirror effect: A perfect lens brings a brighter feature
Yadong Xu, Shengwang Du, Lei Gao +1
In this letter, we show that a perfect lens can be employed to make multiple objects appear like only one in the far field, leading to a new concept of illusion optics. Numerical s…