In this contribution, we present preliminary results of using graphic card with hardware support for ray tracing for physics simulation of a positron emission tomography (PET) scanner. On our simplistic setup, we noti...
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We consider observation of Aharonov-Bohm oscillations in clean systems based on the flow of topologically protected currents in silicene and bilayer graphene. The chiral channels in these materials are defined by the ...
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We consider observation of Aharonov-Bohm oscillations in clean systems based on the flow of topologically protected currents in silicene and bilayer graphene. The chiral channels in these materials are defined by the flips of the vertical electric field. The line of the flip confines chiral currents flowing along it in the direction determined by the valley. We present an electric field profile that forms a crossed ring to which four terminals can be attached, and find that the conductance matrix elements oscillate in the perpendicular magnetic field in spite of the absence of backscattering. We propose a four-probe resistance measurement setup, and demonstrate that the resistance oscillations have large visibility provided that the system is prepared in such a way that a direct transfer of the chiral carriers between the current probes is forbidden.
The study introduces a 3D-printed lens assembly that has been rotated and equipped with an ultrawideband (UWB) antenna, designed specifically for beam-steering applications. The primary objective is to achieve beam st...
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ISBN:
(数字)9798350379051
ISBN:
(纸本)9798350379068
The study introduces a 3D-printed lens assembly that has been rotated and equipped with an ultrawideband (UWB) antenna, designed specifically for beam-steering applications. The primary objective is to achieve beam steering by integrating the rotating 3D-printed lens assembly with a hemispherical lens and UWB antenna. The UWB antenna is constructed on an FR-4 substrate, while the hemispherical lens and the rotating 3D-printed lens assembly are composed of Acrylonitrile Butadiene Styrene (ABS). To allow the hemispherical lens to rotate to a certain angle, a collection of 3D-printed lenses that can be rotated was created. These lenses were marked with five predetermined angles: 300 degrees, 330 degrees, 0 degrees, 30 degrees, and 60 degrees. Both the modeling and experimental findings demonstrate that the UWB antenna with the 3D-printed rotatable hemispherical lens assembly is unable to guide the beam at a low frequency of 3.1 GHz. Nevertheless, at frequencies of 7.0 GHz and 10.6 GHz for intermediate and high frequencies, respectively, the beam can be directed based on the rotation of the hemispherical lens.
The maximal speed v∗ for magnetic flux quanta is determined by the energy relaxation of unpaired electrons and is thus essential for superconducting microstrip single-photon detectors (SMSPDs). However, the deduction ...
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The maximal speed v∗ for magnetic flux quanta is determined by the energy relaxation of unpaired electrons and is thus essential for superconducting microstrip single-photon detectors (SMSPDs). However, the deduction of v∗ from the current-voltage (I-V) curves at zero magnetic field is hindered by the unknown number of vortices, nv, as a small number of fast-moving vortices can induce the same voltage as a large number of slow-moving ones. Here, we introduce an approach for the quantitative determination of nv and v∗. The idea is based on the Aslamazov and Larkin prediction of kinks in the I-V curves of wide and short superconducting constrictions when the number of fluxons crossing the constriction is increased by one. We realize such conditions in wide MoSi thin strips with slits milled by a focused ion beam and reveal quantum effects in a macroscopic system. By observing kinks in the I-V curves with increase of the transport current, we evidence a crossover from a single- to multifluxon dynamics and deduce v∗≃12 km/s. Our experimental observations are augmented with numerical modeling results, which reveal a transition from a vortex chain over a vortex jet to a vortex river with increase of nv and v. Our findings are essential for the development of one-dimensional and two-dimensional few-fluxon devices and provide a demanded approach for the deduction of maximal vortex velocities at the SMSPD operation conditions.
We present a design and analysis of nonlinear distortions for low-area integrated neural preamplifier with pseudoresistor-based AC coupling. We evaluate the distortions as a function of frequency, signal amplitude and...
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Bouncing models of cosmology, as they arise, e.g., in loop quantum cosmology, can be followed by an inflationary phase and generate close-to-scale-invariant fluctuation spectra as observed in the cosmic microwave back...
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Bouncing models of cosmology, as they arise, e.g., in loop quantum cosmology, can be followed by an inflationary phase and generate close-to-scale-invariant fluctuation spectra as observed in the cosmic microwave background (CMB). However, they are typically not Gaussian and also generate a bispectrum. These models can help to mitigate the large-scale anomalies of the CMB by considering substantial non-Gaussianities on very large scales, which decay exponentially on subhorizon scales. It was therefore thought that this non-Gaussianity would not be visible in observations, which can only probe subhorizon scales. We show that bouncing models with parameters such that they can significantly mitigate the large-scale anomalies of the CMB are excluded by the Planck data with high significance of, depending on the specific model, 5.4, 6.4, or 14 standard deviations.
This paper proposes an adaptive control for a battery energy storage system (BESS) using a fuzzy logic controller (FLC), specially designed to operate in parallel with an electric arc furnace (EAF) in the Cuban power ...
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Hexagonal boron nitride (hBN) has emerged as a compelling platform for both classical and quantum technologies. In particular, the past decade has witnessed a surge of novel ideas and developments, which may be overwh...
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We consider states bound at the flip of the electric field in buckled silicene. Along the electric flip lines a topological confinement is formed with the orientation of the charge current and the resulting magnetic d...
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We consider states bound at the flip of the electric field in buckled silicene. Along the electric flip lines a topological confinement is formed with the orientation of the charge current and the resulting magnetic dipole moment determined by the valley index. We compare the topological confinement to the trivial one that is due to a local reduction of the vertical electric field but without energy gap inversion. For the latter the valley does not protect the orientation of the magnetic dipole moment from inversion by external magnetic field. We demonstrate that the topologically confined states can couple and form extended bonding or antibonding orbitals with the energy splitting influenced by the geometry and the external magnetic field.
We address a task of local trajectory planning for the mobile robot in the presence of static and dynamic obstacles. Local trajectory is obtained as a numerical solution of the Model Predictive Control (MPC) problem. ...
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