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David J. Bergman
English
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Article
Angular Anisotropy of Thermoelectric Properties of a Periodic Composite Medium in the Presence of a Magnetic Field
When the magnetic field is strong enough, the effective galvano-magnetic thermoelectric properties of periodical metamaterial exhibit very strong variations with the direction of the applied magnetic field wit...
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Article
Solar energy harvesting in the epicuticle of the oriental hornet (Vespa orientalis)
The Oriental hornet worker correlates its digging activity with solar insolation. Solar radiation passes through the epicuticle, which exhibits a grating-like structure, and continues to pass through layers of...
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Article
Gravity orientation in social wasp comb cells (Vespinae) and the possible role of embedded minerals
Social wasps and hornets maintain their nest in the dark. The building of the combs by all Vespinae is always in the direction of the gravitational force of Earth, and in each cell’s ceiling, at least one ‘key...
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Article
Do Bees and Hornets Use Acoustic Resonance in Order to Monitor and Coordinate Comb Construction?
We propose that social hornets and bees, who construct large arrays (known as combs) of cells for hatching and brooding their offspring, exploit ultrasonic acoustic resonances in those cells in order to implem...
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Chapter and Conference Paper
Coherent Control of Ultrafast Linear and Nonlinear Optical Phenomena in Nanostructures
We theoretically investigate the unique possibility to control distribution of ultrafast local optical fields, both linear and nonlinear, in nanosystems with nanometer spatial resolution and in time on the fem...
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Chapter and Conference Paper
SPASER as Ultrafast Nanoscale Phenomenon and Device
We theoretically introduce surface plasmon amplification by stimulated emission of radiation (SPASER) as an ultrafast phenomenon and device. Spaser is predicted to generate femtosecond, nanoscale-localized pul...
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Article
A Mixed-Transfer-Matrix Method for Simulating Normal Conductor/Perfect Insulator/Perfect Conductor Random Networks
We develop a mixed-transfer-matrix approach for computing the macroscopic conductivity of a three-constituent normal conductor/perfect insulator/perfect conductor random network. This is applied to two-dimensi...
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Article
Open AccessSubcuticular microstructure of the hornet's gaster: Its possible function in thermoregulation
The present study set out to elucidate the structure and function of the large subcuticular air sacs encountered in the gaster of the Oriental hornet Vespa orientalis (Hymenoptera, Vespinae). Gastral segments I, ...
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Book and Conference Proceedings
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Chapter and Conference Paper
Mixed Transfer-Matrix Method for Computing the Macroscopic Conductivity of Three-Constituent Extreme Networks: Mixtures of Normal Conductor, Perfect Insulator, and Perfect Conductor
We develop a transfer-matrix formulation to compute the conductivity of a normal conductor/perfect insulator/perfect conductor random network, and apply this approach in simulations of two-dimensional and thre...
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Chapter and Conference Paper
Simple Algebraic Approximations for The Effective Elastic Moduli of a Cubic Array of Spheres
The method of elastostatic resonances [1] is applied to the three-dimensional problem of nonoverlap** spherical inclusions arranged in a cubic array in order to calculate the effective elastic moduli. The le...
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Chapter and Conference Paper
Exact Relations Between Critical Exponents for Elastic Stiffness and Electrical Conductivity of Percolating Networks
The exponents which describe the critical behavior of the macroscopic elastic stiffness moduli (T, S) and the macroscopic electrical conductivity (t, s) of a two-constituent composite near a percolation threshold...
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Chapter and Conference Paper
Exact Relations between Macroscopic Moduli of Composite Media in n Dimensions
Generic n-dimensional (nD) exact relations are found between macroscopic or bulk effective moduli of composite systems with related microstructures. These relations can be established between effective values ...
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Article
Exact Relations Between Elastic and Electrical Response of d-Dimensional Percolating Networks with Angle-Bending Forces
Arguments are presented to demonstrate that exact equality relations exist between the critical exponents which characterize the macroscopic conductivity σ e and the macroscopi...
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Chapter
Response of Composite Media Made of Weakly Nonlinear Constituents
Electrical and optical properties of weakly nonlinear composite media are reviewed. A simple perturbation theory can account for many properties, including enhancement of macroscopic nonlinear response near a ...
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Article
Enhancement of Power Factor in A Thermoelectric Composite With A Periodic Microstructure
The thermoelectric power factor has been calculated for a two-constituent composite medium, where one constituent is a “high quality thermoelectric” while the other constituent is a “benign metal”, with large ...
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Chapter
Nonlinear Behavior and Optical Bistability in Composite Media
The nonlinear response of a composite medium to an external electric field can be greatly enhanced if the system is near a strong isolated quasistatic resonance. This situation, achievable in metal-dielectric ...
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Article
Effective Medium Approximation for trongly Nonlinear Media
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Article
Effective medium approximation for strongly nonlinear media
The effective medium approximation is one of the most popular approximations used for calculating the effective coefficients of linear composite media. When the same approach is applied to the case of power-la...
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Article
Weakly nonlinear conductivity of random composites: A series expansion approach
We present a series expansion calculation of the bulk effective coefficient of weakly nonlinear behavior in some continuum composite conductors and in simple cubic random resistor networks. The expansion is in...
