Ingenious microstructure design and a suitable multicomponent strategy are still challenging for advanced electromagnetic wave absorbing (EMA) materials with strong absorption broad effective bandwidth (EAB) at thin sample thickness low filling level. Herein, three-dimensional (3D) dielectric Ti3C2Tx MXene/reduced graphene oxide (RGO) aerogel anchored magnetic Ni nanochains was constructed via directional-freezing method followed by the hydrazine vapor reduction process. The oriented cell...

By combining multiple EMI shielding mechanisms obtained from the high conductivity, strong attenuation capacity and “brick-mortar” layered structure, magnetic "brick-mortar" NiCo/MXene-CNT film can shield 99.99999991% of EM waves.

Abstract Wood-derived carbon has a 3D porous framework composed of through channels along the growth direction, which is suitable matrix for preparing electromagnetic wave (EMW) absorbing materials with low cost, light weight, and environmental friendliness. Herein, carbonized wood decorated by short cone-like NiCo 2 O 4 (NiCo @CW) highly ordered straight-channel architecture was successfully manufactured facile calcination procedure. The horizontal arrangement @CW (H-NiCo exhibits strong...

Orbital angular momentum (OAM) mode crosstalk induced by atmospheric turbulence is a challenging phenomenon commonly occurring in OAM-based free-space optical (FSO) communication. Recent advances have facilitated new practicable methods using abruptly autofocusing light beams for weakening the effect on FSO link. In this work, we show that circular phase-locked Airy vortex beam array (AVBA) with sufficient elements has inherent ability to form an carrying OAM, and its focusing properties can...

Abstract For large-scale integrated electronic equipment, the complex operating mechanisms make fault detection very difficult. Therefore, it is important to accurately identify analog circuit faults in a timely manner. To overcome this problem, paper proposes novel diagnosis method based on deep belief network (DBN) and restricted Boltzmann machine (RBM) optimized by gray wolf optimization (GWO) algorithm. First, DBN used extract features of output signal. Then, GWO optimize penalty factor...

Carbon nanotube/continuous carbon fiber reinforced poly(ethylene terephthalate) (CNT/CCF/PET) composites are prepared by melt impregnating. The effects of CF and CNT content on the mechanical properties, crystallization behaviors, submicroscopic morphology CNT/CCF/PET studied. tensile test results show that increase addition appropriate amount improved strength modulus composites. When is 1.0 wt% 56 wt%, properties best, with 1728.7 MPa 25.1 GPa, which much higher than traditional resin...

The probability densities of orbital angular momentum (OAM) modes the autofocusing Airy beam (AAB) carrying power-exponent-phase vortex (PEPV) after passing through weak anisotropic non-Kolmogorov turbulent atmosphere are theoretically formulated. It is found that AAB PEPV result weighted superposition multiple OAM at differing positions within cross-section, and mutual crosstalk among different will compensate distortion each mode be helpful for boosting anti-jamming performance...

This study introduces and experimentally demonstrates the concept of a modified anomalous vortex beam (MAVB), which carries orbital angular momentum (OAM) exhibits unique self–focusing properties. By utilizing holographic techniques customizing phase masks, we precisely control beam’s intensity distribution, enhancing self-focusing behavior while preserving traditional features. We derive an analytical formula to describe MAVB propagation within paraxial ABCD optical system. The...

A novel refractive-index (RI) Michelson interferometer based on a waist-enlarged taper is achieved. Such device fabricated by splicing section of multimode fiber (MMF) at one end single-mode (SMF). Due to the bitaper coupling point SMF and MMF, light coupled into MMF from lead in core, intermodal interference will occur for optical path difference between core mode cladding mode. Then, be reflected recoupled back out bitaper. When lights return fiber, high order The sensor has linear...

The orbital angular momentum (OAM) of a Laguerre–Gaussian beam (LGB) is classified using the support vector machine (SVM) model. scintillation index, width, and wander Gaussian LGB at receiving site are taken as feature vectors, OAM number label in training test samples. influences on detection accuracy samples, transmission distance, different ways grouping values analyzed, where defined percentage correctly detected OAM. results show that only few samples needed up to range 4000 m achieve...

This study explores the propagation dynamics of Bessel-Gaussian (BG) beams, focusing on vortex-splitting behavior under short-range atmospheric conditions with varying disturbances. Using split-step beam method, research reveals that greater turbulence and longer transmission distances enhance both average vortex splitting distance its variance while reducing topological charge received OAM mode. Conversely, laminar promote stability. Results highlight high sensitivity to parameters, playing...

Abstract The continuous carbon fiber reinforced Polyether-ether-ketone (PEEK) prepreg tapes with the addition of nanotubes (CNTs) were prepared by a wet powder impregnation process. Their electrical conductivity, thermal tensile properties, dynamic mechanical behavior, fracture morphology and crystallization melting behavior investigated. results show that, conductivity ( σ ), λ strength t ) interfacial adhesion obviously improved CNTs. When CNT content was 1.0 wt%, CNT/CCF/PEEK in 0°...

The effects of asymmetry atmospheric eddies on the beam spreading and wander Bessel-Gaussian (BG) beams in anisotropic turbulence are studied. Results show that anisotropy leads to declines both BG atmosphere. A with larger shape parameter η has a narrower spot size short-distance range wider long-distance range. effective Rayleigh ranges for every turbulent situation decrease η. When is than 10, negligible effect increase decreases as topological charge increase. Beam mainly affected by...

The expression of complex dielectric permittivity for non-magnetized fully ionized dusty plasma is obtained based on the kinetic equation in Fokker–Planck–Landau collision model and charging statistical theory. influences density, average size dust grains, balanced charge number particles attenuation properties electromagnetic waves are investigated by calculating constant. In addition, characteristics weakly plasmas compared. Results enriched physical mechanisms microwave provide a...

The rapid increase in orbital angular momentum (OAM) mode size with increasing modal order, given the limited-size of receiver, is a major impediment to high-capacity OAM multiplexing practice. Based on Pancharatnam-Berry (PB) phase theory, we correlate change polarization state curvature wavefront isophase line source plane and manipulate focusing ability vector autofocusing Airy vortex beam (AAVB) by combining intensity gradient beam, which are two independent degrees freedom. present...

Vortex splitting is one of the main causes instability in orbital angular momentum (OAM) modes transmission. Recent advances OAM free-space propagation have demonstrated that abruptly autofocusing Airy vortex beams (AAVBs) can potentially mitigate effect. However, different embedding will affect intensity gradients background beams, leading to changes characteristics beams. This study presents unification two common methods coupling with vortices by introducing a parameter (m), which also...

A Fourier analysis applied to the Mach–Zehnder interferometer (MZI) transmission spectrum for simultaneous refractive index (RI) and temperature measurements is proposed experimentally demonstrated in this Letter. In fast transform (FFT) of MZI spectrum, several frequency components are generally observed, which means that formed by superposition some dual-mode interference (DMI) spectra, each component represents different core-cladding interferences. We can select dominant FFT take inverse...

Carbon nanotube/continuous carbon fiber–reinforced poly(etherketoneketone) (CNT/CCF/PEKK) prepreg tapes were prepared by the wet powder impregnation method, and then molded into laminates. The effects of nanotubes on mechanical properties, conductivity, thermal conductivity crystallinity composites studied universal testing machine, resistivity tester, dynamic analyzer (DMA) differential scanning calorimeter (DSC). results show that when content is 0.5 wt% (relative to mass PEKK resin, same...