A recurrent loop consisting of a single Hodgkin-Huxley neuron influenced by chemical excitatory delayed synaptic feedback is considered. We show that the behavior system depends on duration activity synapse, which determined activation and deactivation time constants synapse. For fast synapses, those for effect small compared to period firing, depending delay time, spiking with multiple interspike intervals possible average firing rate can be smaller or larger than open neuron. slow synapses...

Shared upstream dynamical processes are frequently the source of common inputs in various physical and biological systems. However, due to finite signal transmission speeds differences distance source, time shifts between otherwise unavoidable. Since can be a correlation elements multi-unit systems, regardless whether these directly connected with one another or not, it is importance understand their impact on synchronization. As canonical model that representative for variety different we...

In this paper, an amplitude and phase gradient-modulated surface is introduced to design a low cost simple radar cross section (RCS) reducer metasurface. The simultaneous gradual differences between adjacent unit cells achieve more degrees of freedom in the approach, which leads bandwidth enhancement RCS reduction. A dual-layer stacked patch cell analyzed with transmission line method proposed different required cells. sinusoidal modulation applied on top bottom layers two FR-4 substrates...

We investigate the impact of a stochastic forcing, comprised sum time-lagged copies single source noise, on system dynamics. This type forcing could be made artificially, or it result shared upstream inputs to through different channel lengths. By means rigorous mathematical framework, we show that such is, in fact, equivalent classical case stochastically-driven dynamical with time-delayed intrinsic dynamics but without time lag input noise. also observe resonancelike effect between period...

This paper deals with the design and fabrication of an unpretentious (single-layer, without any lump element) broadband (97%, 11.3-32.3 GHz) radar cross-section reduction (RCSR) modulated surface (MS). The proposed structure uses sinusoidal modulation gap sizes between square patches within unit cells to form a phase gradient that plays effective role in improving RCSR bandwidth. An MS dimensions 250 × mm2, consisting 40 period 6 mm printed on RO4003C (lossy) substrate 0.06λLF (λLF being...

<p>This paper presents a new efficient and robust method for the automatic design of Metasurface (MS) by using Deep Neural Network (DNN), which has less complexity time compared to conventional MS methods. The main contribution present is its ability reflective/transmissive wave manipulation in wide range frequencies (12 GHz - 18 GHz). To this end, several multi-bit encoded MSs are provided that potential interest single/multi-beam, Orbital Angular Momentum (OAM), Phase Gradient (PGM)...

ORIGINAL RESEARCH article Front. Comput. Neurosci., 14 August 2013 https://doi.org/10.3389/fncom.2013.00108

In this paper, the design and fabrication of modulated metasurfaces is proposed to achieve a wideband monostatic radar cross section (RCS) reduction. This structure composed holography surface tiles arranged in checkerboard configurations where converts incoming wave into waves redirects it other directions rather than normal one. reduces RCS more 10 dB from 11.57–26.1 GHz (77%) for incidence. Using only one low cost commercially available FR-4 substrate layer facilitates its applications...

We consider a Bose-Einstein condensate, described by the Gross-Pitaevskii equation, in horizontally vibrating shallow optical lattice. study dynamics of bright soliton using collective coordinate approximation. show that depending on parameters, amplitude, and frequency vibration lattice, phase space equation motion for center mass shows multistability. In locked regions, which has nonzero average velocity determined external frequency, is quasiperiodic, between regions moves chaotically.

Design criteria of low-cost, dual-concentric metasurface possessing wideband phase gradient (PG) are introduced. The radar cross-section reduction (RCSR) is explained by anomalous reflection that characterizes the superficial planar. geometry consists two single band RCSR modulated surfaces (MSs) triggered in each other. Each MS built-up square patch (SP) unit cells configured as a modulation structure to realize PG causes and monostatic behavior. Applying sinusoidal sequence SP leads...

Abstract This paper presents a new wideband waveguide substrate integrated (SIW) coupler with maximum deviation of ±0.5 dB in 7.5–12.25 GHz bandwidth (48% fractional bandwidth). Proposed consists the standard WR90 and single layer/double clad SIW printed circuit board (PCB) which is placed crosswise on waveguide. three port (isolated was ended match load) has two coupling level (average 8–12 frequency range) 43.2 58.3 dB, correspond hole diameter 3.5 3 mm, respectively. The main contribution...

In this paper, a low-cost, simple, and reliable bi-static radar cross-section (RCS) measurement method by using historic Marconi set-up is presented. It uses transmitting (Tx) antenna (located at constant position, reference angle of θ=0∘θ=0∘) moving receiver (Rx) antenna. A time gating used to extract the information from reflection in domain; applying filter allows removing side-lobe effects other ambient noises. method, Rx (on movable arm) measure reflected field angular range 1∘1∘ 90∘90∘...

In this paper a novel systematic design method based on Genetic Algorithm (GA) for transmitting lens antenna is introduced. The consists of dual-layer phase-gradient metasurface (PGMS). GA has been used to the unit cells configurations incorporating in cost function performances main parameters an such as gain, bandwidth and side lobe level. To set pixilation-based cells, single bit with binary value 0 or 1 that indicates presence absence copper at pixel level, respectively, considered each...

<p>This paper presents a new efficient and robust method for the automatic design of Metasurface (MS) by using Deep Neural Network (DNN), which has less complexity time compared to conventional MS methods. The main contribution present is its ability reflective/transmissive wave manipulation in wide range frequencies (12 GHz - 18 GHz). To this end, several multi-bit encoded MSs are provided that potential interest single/multi-beam, Orbital Angular Momentum (OAM), Phase Gradient (PGM)...

Abstract A single‐layer left‐handed circularly polarized (CP) Fabry‐Perot cavity antenna (FPCA) with stable gain performance around at the center frequency is designed, fabricated and tested 14.5 GHz. The FPCA fed by a linearly (LP) microstrip patch aligned along slant 45° composed of double‐sided top layer, which designed to act as partially reflecting surface (PRS) polarizer simultaneously, high impedance (HIS) ground layer. Several classes unit cell configurations are investigated for...

We study the energy spectrum for an aperiodic Josephson junction ladder, as a function of frustration. Frustration is brought about by application transverse magnetic field, and aperiodicity imposed arrangement plaquettes with two incommensurate areas. effect plaquette areas in conjunction that aperiodicity. The structure at deep minima shown to be described model treats independently. quasiperiodic frustration; short range correlations have small on power spectrum.

We consider a rotating Bose-Einstein condensate in square optical lattice the regime which Hamiltonian of system can be mapped onto Josephson junction array. In an approximate scheme where couplings are assumed uniform, ground state energy is formulated terms vortex configuration. The results compared with experimental and also previously reported for frustrated XY model. show that configuration robust respect to change therefore remain valid when we more realistic model non-uniform couplings.

We address a question on the effect of common stochastic inputs correlation spikes trains two neurons when they are possibly nonidentical and coupled through direct connections. show that change in low amplitude can be better detected connected by excitatory couplings. Depending whether identical or slightly different, symmetric asymmetric connections increase sensitivity system to input changing mean slope transfer function over given range correlation. In either case, there is also an...

Abstract The design and fabrication of low loss wideband Magic‐T with 10 dB return (RL) bandwidth over 40% is proposed for X‐band application, which can be used in monopulse comparator network. composed WR90 waveguides include an exponentially conducting cone, metallic multistep l ‐shaped septum, some other posts. By implementation these optimized posts, the 20 RL 36% achieved very insertion (IL) (<0.15 dB) at each port. Moreover, high isolation (>40 across all port another feature...

Chemists "know" that the equilibrium position in a homogeneous solution is unique and one reached, irrespective of how was prepared. This concept has been verified based on law mass action applied to concentrations rather than activities. In this contribution, we explore situation for very basic system, using established approximations activity coefficients. We will demonstrate under correct application action, bistable equilibria positions are possible, concomitant, course, with bifurcation...

We employ the charge neutrality condition in form of zero vorticity for a Josephson junction lattice calculating its ground state. consider Fibonacci ladder and Penrose to test our method. also compare results with those model that treats plaquettes independently. show improves on independent plaquette model.