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Decreases in head-disk gap have led to great advances in the magnetic recording technology used for hard disk drives. Because the head-disk gap has reached a few nm or less, head-disk contact can occur. Therefore, lubricant replenishment for depleted areas due to the head contact is a crucial issue in designing head-disk interface (HDI); however, the replenishment mechanism for monolayer or submonolayer...
Automatic face recognition in unconstrained environments is a challenging task. To test current trends in face recognition algorithms, we organized an evaluation on face recognition in mobile environment. This paper presents the results of 8 different participants using two verification metrics. Most submitted algorithms rely on one or more of three types of features: local binary patterns, Gabor...
As the magnetic storage density approaches 1 TB/in, a grand challenge is looming as how to read/write such a huge amount of data within a reasonable time. In this study, we demonstrate femtosecond demagnetization in 10-nm epitaxially grown Fe thin films by applying low-energy femtosecond laser pulses. We used time-resolved pump-probe Magneto Kerr Effect spectroscopy to record ultrafast laser induced...
We report on the generation of coherent N2+ emissions in a plasma string driven by two-color laser fields and measure their temporal structures. It is confirmed that the coherent emissions originate from seed-injected amplification.
This paper presents an experimental study on the microwave detection of spherical dielectric bodies exhibiting varying complex permittivity from the embedding lossy dielectric medium, simulating malignant tumors of different dielectric contrast from normal biological tissue. Measurements are performed using a flanged parallel-plate dielectric waveguide probe (PPDW) on phantom materials. Preliminary...
This paper describes an automated in-vehicle field measurement systems that can be used to acquire 3D electric field distribution generated from wireless antenna sources placed within a passenger vehicle. One prototype is made out of metal and another Delrin. Comparisons between simulated and measured 2D field distribution within a simple cavity correlate well at 870 MHz. Measurements made within...
A static electric field enables 1 + 2-photon coherent control of the photoexcited carrier population in semiconductors. A theory based on the Franz-Keldysh effect is compared to results of an experiment in (100) GaAs.
This paper presents an improved method for microwave detection of breast cancer with a flanged parallel-plate dielectric waveguide probe, based on detecting the dielectric contrast between a tumor and the surrounding breast tissue. Presence of a tumor is derived from the resonant characteristics of the backscattered signal received. Simulations demonstrate a good return loss over a useful bandwidth...
We experimentally investigate the effect of residual disorder on the dispersion curve of light near a band edge. A Fourier space imaging technique accurately distinguishes the propagating regime from diffusive transport and evanescent regime in planar photonic crystal. We highlight and quantify the impact of the disorder on the group velocity near a band edge. We stress that the achievement and determination...
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