A.Y.C. Yu

Krylov State Research Center

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Co-Authors

H.J. Gopen

Intel (United States)

E. H. Snow

Fairchild Semiconductor (United States)

W. E. Spicer

Stanford University

V. V. Zalipaev

ITMO University

Viktor A. Vyalov

Krylov State Research Center

Ilya A. Shikhov

Krylov State Research Center

D. E. Ruiz

Sandia National Laboratories

Ahmed A. Kishk

Concordia University

Stanislav Glybovski

ITMO University

Christopher T Seagle

Sandia National Laboratories

Cooperative Institutions

Sandia National Laboratories

178

Sandia National Laboratories California

143

Lawrence Livermore National Laboratory

Los Alamos National Laboratory

University of Michigan–Ann Arbor

General Atomics (United States)

National Technical Information Service

Office of Scientific and Technical Information

Energetics (United States)

University of Rochester

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Floating off-board radar decoys: stealth at sea

TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE (2023)

A.Y.C. Yu Ilya A. Shikhov

Object and purpose of research. Radar signatures of floating off-board decoys used by foreign navies for eluding anti-ship missiles of at sea are estimated. Materials and methods. Analysis of existing floating radar decoys are based on reviews of leading foreign experts. Signatures of these decoys at sea were calculated using a four-beam model of electromagnetic wave scattering on the underlying surface developed at KSRC. Main results. Quantitative assessments of floating decoy detection ranges by typical anti-ship missile radar seekers are made. Conclusion. The investigations showed that flying radar balloons are more effective in seduction of anti-ship missiles.

Decoy

Radar lock-on

On board

10.24937/2542-2324-2023-2-404-154-157

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Citations (0)

Photoemission Studies of the Electronic Structure of Cobalt

Physical Review (1968)

A.Y.C. Yu W. E. Spicer

Photoemission measurements have been made on cobalt to study major features of its electronic structure over a large energy range. In the spectral range studied ($7.4 \mathrm{eV}\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}11.6 \mathrm{eV}$), nondirect transitions dominate. The optical density of states is determined from the photoemission and optical data. Peaks are found in the valence-band structure at about 0.3, 2.4, and 5.2 eV below the Fermi level, and no structure is found in the conduction band for $4.5 \mathrm{eV}\ensuremath{\le}E\ensuremath{-}{E}_{f}\ensuremath{\le}115 \mathrm{eV}$. The $\ensuremath{\omega}\ensuremath{\sigma}$ curve is fitted reasonably well using the optical density of states and assuming nondirect transitions. A strong similarity is found between the optical density of filled states for Co and that of Ni and Fe. Thus the optical density of states for Fe, Co, and Ni do not seem to be related via the rigid-band model. A discussion is given on these data and their relevance to other related results.

Density of states

Inverse photoemission spectroscopy

10.1103/physrev.167.674

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Citations (30)

Alloying Behavior of Au and Au–Ge on GaAs

Journal of Applied Physics (1971)

J. Gyulai J. W. Mayer Vincent Rodriguez A.Y.C. Yu H.J. Gopen

Although Au–Ge has often been used in making Ohmic contacts to GaAs, the alloying behavior of this system has not been well characterized and understood. In this paper the behavior of Au and Au–Ge layers on GaAs was investigated as a function of processing temperature (400–600°C) and time by backscattering and channeling-effect measurements with 2-MeV 4He ions. Scanning electron microscopy and current-voltage evaluations were also made. Similarities are found in both systems: There is a deeply penetrating component of Au into the GaAs that remains essentially unaltered once the surface Au has been consumed; a disordered region near the surface is found, the amount of which increased with increased process times. No significant amount of Au is found on substitutional or tetrahedral interstitial sites within about 3000 Å of the surface. The presence of the Ge does have a significant effect: Complete alloying occurs at lower temperatures, and Ohmic contacts are formed. Scanning-electron-microcope displays indicate that surface pits are formed; the depth of these increase with increased amounts of Au. Optical micrographs of a sectioned sample indicate a deep Au penetration.

Ohmic contact

Penetration (warfare)

10.1063/1.1660773

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Citations (122)

Minority carrier injection of metal-silicon contacts

Solid-State Electronics (1969)

A.Y.C. Yu E. H. Snow

10.1016/0038-1101(69)90027-6

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Citations (54)

Surface Effects on Metal-Silicon Contacts

Journal of Applied Physics (1968)

A.Y.C. Yu E. H. Snow

Surface effects on metal-silicon contacts have been studied in detail using gate-controlled Schottky-barrier diode structures. The ``excess'' forward and reverse currents at small and moderate bases, respectively, and low breakdown voltages usually associated with metal-silicon contacts are clearly shown to be due to high fields near the corner region when the surface is accumulated. These currents can be eliminated and breakdown voltage increased by depleting or inverting the surface. By studying the diode characteristics when the surface is inverted, it is shown that the generation current in the depletion region often constitutes a significant part of the total reverse current and cannot in general be neglected.

Reverse bias

Avalanche breakdown

10.1063/1.1656723

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Citations (139)

An Improved MM-PO Method with UV Technique for Scattering from an Electrically Large Ship on a Rough Sea Surface at Low Grazing Angle

Siyuan He Chi Hion Pedro Li Li Feng-Feng ZHANG Guocui Zhu Weiwei Hu

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Outlook for application of radars with phased-array antennas in foreign navies on missile tracking ships

TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE (2018)

A.Y.C. Yu

Tracking (education)

10.24937/2542-2324-2018-3-385-145-152

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Citations (0)

Advanced mitigation tools for above-water ship signatures and their efficiency verification

TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE (2019)

A.Y.C. Yu A. V. Matveentsev Yury M. Patrakov A. A. Rzhevsky

10.24937/2542-2324-2019-1-387-155-166

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Citations (1)

Convolutional neural networks for optical image recognition of ships

TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE (2020)

Viktor A. Vyalov A.Y.C. Yu

10.24937/2542-2324-2020-3-393-91-96

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Citations (1)

Surface current measurements with ship-borne Doppler HF radar

International Radar Symposium (2013)

V.V. Gorbatskiy A.Y.C. Yu

The paper presents application results for high-frequency Doppler radar system SeaSonde™ by CODAR Ocean Sensors meant for measurement of surface currents in Kara Sea water areas from ship board. The developed measurement guidelines enabled collecting on-line data on currents structure in the area featuring high variability of hydrometeorological parameters. The obtained data ensure assessment of quantitative characteristics of current tidal instability in the investigated water area and demonstrate relationship between surface current parameters and spatial nonuniformity of water salinity. Such nonuniformity in this case is stipulated by intensive river discharge in the measured area.

Hydrometeorology

Wave radar

Current meter

On board

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Citations (1)