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First thrust measurements in ionic multi-propeller rotational engines

Propulsion and Power Research 2023年第1期12卷 44-58页

作者： Adrian Ieta Marius Chirita Electrical and Computer Engineering Department SUNY OswegoOswegoNY 13126-3599USA Applied Physics/Condensed Matter Department National Institute for Research and Development in Electrochemistry and Condensed MatterTimisoaraRO-300224Romania

Rotary ionic engines(RIEs)with multi-coaxial contra-rotating propellers(12.6 cm diameter)and their axial thrust are investigated in laboratory conditions,in air at atmospheric pressure,for the first *** goal is to evaluate more advantageous configurations that may be scaled up and further help with development of rotary ionic *** propellers are designed with regular pin-emitter electrodes placed coaxially inside a cylindrical collector *** high voltage is applied,propellers spin generating conventional axial thrust which is measured with an electronic scale in a“see-saw”*** to 40 mN thrust was obtained in single propeller RIE at 2600 rpm,0.34 mA,37.5 kV,and an optimal collector electrode diameter of 17 *** thrust can be obtained with two and three propellers at constant current per propeller but at a decreased *** the axial propeller-separation showed that propeller-interaction is minimal above 5 ***-to-power and thrust-tocurrent ratios were calculated and *** experimentally confirm here for the first time that within certain limits,the thrust-to-power variation can be assessed by the propeller kinetic energy-to-power ratio and also by the impedance of the gap(voltage-to-current ratio).A comparison of RIE arrays performance with one,two,and three coaxial propellers and the same total number of propellers per array(six)is also *** arrays with multi-coaxial propellers can provide larger thrust densities than single-propeller ***,arrays employing two coaxial propeller unit may be more weight effective.

关键词： Ionic wind EHD pump Electrohydrodynamics Corona discharge Thrust-to-power Propeller Ion propulsion Plasma thrusters Electroaerodynamic thrusters Ionocraft

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Energy Management Strategy with a Hybrid Renewable Energy System for a Standalone House

Energy Management Strategy with a Hybrid Renewable Energy Sy...

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International Conference on applied and Theoretical Electricity (ICATE)

作者： Laurentiu-Alex Mustaţă Gheorghe-Dan Sorea Elena Helerea Electrical Engineering and Applied Physics Department Electrical Engineering and Computer Science Faculty Transilvania University Brasov Romania

ISBN: (数字)9798350388107

ISBN: (纸本)9798350388114

In the case of standalone houses, ensuring a continuous and regulated power supply from renewable sources is crucial. To address their unpredictable nature, an environmentally conscious hybrid renewable energy system combining photovoltaic panels, a battery, and a Diesel generator is considered. A software application simulates the power flow in a standalone house with common AC loads, analysing summer and winter scenarios over 24 hours. The strategy employed provides an optimal energy management by using the Diesel generator only during peak demand when PV is available and to cover loads and maintain battery life when PV is not in operation. The simulation results provide valuable insights for designing such hybrid energy systems and for enhancing system responsiveness to dynamic energy demands.

关键词： Photovoltaic systems Renewable energy sources Costs Power system dynamics Generators Hybrid power systems Batteries Energy management Optimization Load flow

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Interferometer for Dispersive Measurements

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Physical Review Letters 2024年第4期132卷 043802-043802页

作者： S. E. Harris Departments of Electrical Engineering and Applied Physics Ginzton Laboratory Stanford University Stanford California 94305 USA.

We suggest the use of broadband frequency modulation to construct a novel type of optical interferometer. This interferometer is insensitive to optical phase and allows measurement of the group velocity and group velo... 详细信息

关键词： Nonlinear optics Crystal optics Fiber lasers Optical materials & elements Optical parametric oscillators & amplifiers Optical sources & detectors Waveguides

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Simulated and experimental studies of a multi-band symmetric metamaterial absorber with polarization independence for radar applications

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Chinese physics B 2022年第5期31卷 703-710页

作者： Hema O.Ali Asaad M.Al-Hindawi Yadgar I.Abdulkarim Ekasit Nugoolcharoenlap Tossapol Tippo FatihÖzkan Alkurt Olcay Altintas Muharrem Karaaslan Department of Communication Engineering Sulaimani Polytechnic UniversitySulaimani 46001Iraq Medical Physics Department College of Medicals and Applied ScienceCharmo UniversityChamchamal 46023SulaimaniaIraq Department of Telecommunication Engineering Faculty of EngineeringRajamangala University of Technology RattanakosinPhutthamonthonNakornprathom 73170Thailand Department of Electrical and Electronics Engineering Iskenderun Technical UniversityHatay 31100Turkey

We develop a simple new design for a multi-band metamaterial absorber(MTMA)for radar *** Simulation Technology(CST)Studio Suite 2018 was used for the numerical analysis and absorption *** simulated results show four high peaks at 5.6 GHz,7.6 GHz,10.98 GHz,and 11.29 GHz corresponding to absorption characteristics of 100%,100%,99%,and 99%,***,two different structures were designed and compared with the proposed *** proposed structure remained insensitive for any incident angle and polarization angle from 0°to60°.Moreover,negative constitutive parameters were retrieved *** support the simulated results,the proposed design was fabricated by using a computer numerical control-based printed circuit board prototyping machine and tested experimentally in a microwave *** absorption mechanism of the proposed MTMA is presented through the surface current and electric field *** novelties of the proposed structure are a simple and new design,ease of fabrication,low cost,durability,suitability for real-time applications and long-term stability given the fabrication technique and non-destructive measurement method and very high *** proposed structure has potential applications in C and X band frequency ranges.

关键词： multi-band metamaterials absorber polarization-independent negative parameters

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Fractional AC Josephson effect in a topological insulator proximitized by a self-formed superconductor

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Physical Review B 2024年第6期110卷 064511页

作者： Ilan T. Rosen Christie J. Trimble Molly P. Andersen Evgeny Mikheev Yanbin Li Yunzhi Liu Lixuan Tai Peng Zhang Kang L. Wang Yi Cui M. A. Kastner James R. Williams David Goldhaber-Gordon Department of Applied Physics Stanford Institute for Materials and Energy Sciences Joint Quantum Institute and Quantum Materials Center Department of Physics Department of Materials Science and Engineering Department of Physics Department of Electrical Engineering

A lateral Josephson junction in which the surface of a three-dimensional (3D) topological insulator (TI) serves as the weak link should support topologically protected excitations related to Majorana fermions. The resulting 4π-periodic current-phase relationship could be detected under high-frequency excitation by the suppression of odd Shapiro steps. Here, we demonstrate such devices through the self-formation of a Pd-Te superconducting layer from a telluride TI and observe suppressed first and third Shapiro steps. Other devices, including those where the Pd-Te layer is bolstered by an additional Al layer, show no suppression of Shapiro steps, a difference supported by simulations. Though we rule out the known trivial causes of suppressed Shapiro steps in our devices, we nevertheless argue that corroborating measurements and disorder-aware theoretical descriptions of these systems are needed before confidently claiming the observation of Majorana states.

关键词： Josephson effect Majorana bound states Majorana fermions Topological insulators Topological materials Topological superconductors Thin films Dilution refrigerator Transmission electron microscopy

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Topology of non-Hermitian degenerate bands in structural parameter space

Topology of non-Hermitian degenerate bands in structural par...

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Long, Olivia Y. Guo, Cheng Fan, Shanhui Department of Applied Physics Stanford University StanfordCA94305 United States Ginzton Laboratory Department of Electrical Engineering Stanford University StanfordCA94305 United States

We achieve complex band degeneracy in a photonic crystal structure over a region of momentum space, which gives rise to polarization-independent transmission. The degeneracy manifests as a topological singularity in t... 详细信息

ISBN: (纸本)9781957171395

关键词： Photonic crystals

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Arbitrary Waveforms From a Fine-Resolution Microresonator-Based Spectral Shaper

Arbitrary Waveforms From a Fine-Resolution Microresonator-Ba...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Cohen, Lucas M. Wu, Kaiyi Myilswamy, Karthik V. Lingaraju, Navin B. Weiner, Andrew M. School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States The Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States

关键词： Silicon photonics

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Arbitrary Waveforms From a Fine-Resolution Microresonator-Based Spectral Shaper

Arbitrary Waveforms From a Fine-Resolution Microresonator-Ba...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

We report a scheme for programming microresonator-based spectral pulse shapers and demonstrate it with a six-channel, sub-GHz linewidth, silicon photonic spectral shaper to generate arbitrary waveforms from optical lines of a 3 GHz electro-optic comb Optical pulse shaping is a useful technique involving the manipulation of the relative amplitudes and phases of spectral slices from a broadband optical spectrum in order to shape the waveform in the time domain. Extensive research over the past couple decades has resulted in robust shaper systems utilizing bulk free space optical setups with components like diffraction gratings, lenses, and liquid crystal on silicon spatial light modulators [1]. While these setups are well-suited for femtosecond, high repetition rate waveform synthesis, they can be excessively large and incur a significant penalty in terms of optical loss when assembled to achieve fine spectral resolutions (order of GHz) necessary for low repetition rate waveforms. There has been a recent desire for fine spectral resolution pulse shaping in, for example, generating picosecond waveforms with a low repetition rate for the quantum control of electronic transitions within molecular ions or atoms [2, 3], or as the driving source for superconductor-based waveform synthesizers [4], and in spectral quantum information processing [5]. Photonic integrated circuits (PICs) offer a low size, weight, and power (SWaP) chip-scale platform for pulse shaping. To this end, the arrayed waveguide grating (AWG) device has been extensively researched. However, the AWG requires long optical paths to be operated at a fine-resolution, resulting in a large footprint (∼ cm× cm) and significant optical loss and phase errors, especially for high-index contrast platforms like silicon-on-insulator (SOI) [6]. A comparatively smaller number of integrated shaper designs have implemented microresonator-based spectral dispersers [7, 8];microresonators benefit from a small footprint, reson

关键词： Pulse repetition rate

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Eigenenergy braids in two-dimensional photonic crystals

Eigenenergy braids in two-dimensional photonic crystals

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Zhong, Janet Wojcik, Charles C. Cheng, Dali Fan, Shanhui Department of Applied Physics Stanford University StanfordCA94305 United States Department of Electrical Engineering Ginzton Laboratory Stanford University StanfordCA94305 United States

We show that two-dimensional non-Hermitian photonic crystals made of lossy material can exhibit nontrivial eigenenergy braids for non-contractible loops in the 2D Brillouin zone. © Optica Publishing Group 2024, &... 详细信息

ISBN: (纸本)9781957171395

关键词： Photonic crystals

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Second Harmonic Generation Enhancement from Isolated Selenium Nanowire Coupled to Mie Resonant Silicon Disks 6

Second Harmonic Generation Enhancement from Isolated Seleniu...

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6th Annual IEEE Research and Applications of Photonics in Defense Conference, RAPID 2023

作者： Biswas, Rabindra Prasad, Shiju Prosad, Asish Lal Krishna, A.S. Gupta, Tapajyoti Das Raghunathan, Varun Indian Institute of Science Department of Electrical Communication Engineering Bangalore India Indian Institute of Science Department of Instrumentation and Applied Physics Bangalore India

ISBN: (纸本)9781665423526

Optical coupling between heterogenous nanophotonic structures is a promising approach to enhance nonlinear optical response. Here we demonstrate second harmonic generation enhancement by 152-times from an isolated Selenium nanowire coupled to a silicon disk supporting Mie Resonances while maintaining the polarization selectivity of the nanowire. © 2023 IEEE.

关键词： Nanowires

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