Searching for new van der Waals (vdW) heterostructure with novel electronic and optical properties is of great interest importance the next generation devices. By using first-principles calculations, we show that arsenene/C3N vdW can be effectively modulated by applying vertical strain external electric field. Our results suggest this has an intrinsic type-II band alignment indirect bandgap 0.16 eV, facilitating separation photogenerated electron-hole pairs. The in tuned from 0-0.35 eV via...

The contribution of this paper is to propose novel balanced and dual-band bandpass filters (BPFs), using quarter-mode (QM) eighth-mode (EM) substrate integrated waveguide (SIW) cavities, for the size reduction overall circuit. Two BPFs, which separately demonstrate a third-order Chebyshev response fourth-order quasi-elliptic response, are realized by properly choosing, feeding, coupling those QMSIW EMSIW cavities. Not only desired differential-mode operation within passband, but also good...

The discovery of stable two-dimensional (2D) semiconductors with exotic electronic properties is crucial to the future technologies. Using first-principles calculations, we predict monolayered Silicon- and Germanium-monopnictides as a new class owning excellent dynamical thermal stabilities, prominent anisotropy, high possibility experimental exfoliation. These semiconductors, including SiP, SiAs, GeP, GeAs, possess wide bandgaps 2.08-2.64 eV obtained by hybrid functional calculation. Under...

Space-time-modulated metasurfaces can manipulate electromagnetic waves in space and frequency domains simultaneously. In this article, an analytical design of space-time-modulated with modulation elements composed two paths, In-phase (I) Quadrature (Q), is proposed. The model derived analytically, the space-/frequency-domain manipulations are achieved by designing dimension time sequence I Q paths. specular reflection direction, objective shift reflected first-order harmonic be obtained....

Planar achromatic metalenses with a thickness of the order wavelength have attracted much attention for their potential applications in ultra-compact optical devices. However, realizing single-layer across wide bandwidth requires that corresponding meta-atoms complex cross-sections correct phase profile and dispersion compensation. Herein, we introduce an effective Abbe number use lens maker equations to design dual-layer metalens which compensate by using plano-convex liked combined...

In this paper, a broadband and tunable terahertz absorber based on graphene metasurface in sandwiched structure is introduced. A single-layered patterned with hollow-out squares applied design, which continuously connected to provide convenience for electrical tuning fabrication. Plasmonic coupling hybridization inside the pattern can significantly enhance absorption bandwidth. Moreover, polarization-insensitive omnidirectional performances are also guaranteed by symmetrical design. Full...

Abstract Heterostructure of various 2D semiconductors have attracted extensive attention due to their tunable electronic properties and tremendous application potential. Using first‐principles calculations, the a GeP/graphene van der Waals heterostructure are studied physical mechanism its modulated by strain electric field examined. The calculations reveal that not only GeP/Graphene heterostructure, but also position graphene's Dirac cone, can be uniaxial strain. Interestingly, induce...

The symmetric successive overrelaxation (SSOR) preconditioning scheme is applied to the conjugate-gradient (CG) method for solving a large system of linear equations resulting from use edge-based finite-element (FEM). For this scheme, there no additional computing time required construct matrix and it contains more global information coefficient when compared with those banded-matrix scheme. efficient implementation preconditioned CG (PCG) algorithm described in details complex matrix. With...

Prior theoretical studies and experience confirm that the stability of marching-on-in-time (MOT) solvers pertinent to analysis scattering from free-standing three-dimensional perfect electrically conducting surfaces hinges on accurate evaluation MOT matrix elements resulting a Galerkin discretization underlying time domain integral equation (TDIE). Unfortunately, four-dimensional spatial integrals involved in expressions for these is prohibitively expensive when performed by computational...

The coherent processing and superresolution of multi-band radar data from multiple spatially collocated radars is addressed by utilizing a sparse representation technique in this paper. Firstly parametric model based on geometrical theory diffraction (GTD) adopted to construct redundant dictionary provide good match the scattering mechanism. Then weights atoms are computed using fast Bayesian learning algorithm. Meanwhile, multilevel dynamic proposed improve accuracy avoid vast number...

We introduce a method to compress the impedance matrix of moments (MoM) for modeling high-fidelity multiscale structures at low- moderate-frequencies. start from recently proposed static (scalar) problems, proved have O(N) computational complexity. represent far coupling between groups through equivalent source distributions on properly defined, automatically generated equivalence surfaces. The sources are obtained via an inverse-source process that enforces radiated fields testing surfaces...

An innovative noniterative approach based on the matrix enhancement and pencil (MEMP) is proposed for synthesis of arbitrary sparse planar arrays. In this study, estimation array parameters recast as a 2-D pole extraction problem, number elements minimized by reduced rank processing. Subsequently, Hankel decomposition algorithm exploited to accelerate singular value (SVD) constructed desired pattern samples, which conquers restriction dimension sampled with increasing elements. The MEMP...

A three-dimensional (3-D)-printed dual-fed dual-frequency dielectric antenna is investigated for vehicular communications. It combines a resonator (DR) (DRA) and lens (DLA) the low high frequency bands, respectively. Both of parts share same body that has three different effective constants. The DRA excited by vertical conducting adhesive strip on its sidewall, whereas DLA fed separate embedded slot-coupled cylindrical DRA. To verify idea, operating at <italic...

A new decoupling method is proposed in this article, which simultaneously realizes port and radiation pattern decoupling, namely, high isolation undistorted patterns, respectively. The shows its effectiveness <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1\times 2$ </tex-math></inline-formula> dielectric resonator (DR) antennas (DRAs) even with zero spacing. Conformal strips are attached to the sidewall...

This paper examines the impact of financial technology (FinTech) on digital transformation accounting information systems (AIS) for small businesses. With rapid advancement technology, FinTech has emerged as a key driver across various industries. For businesses, leveraging to enhance efficiency and accuracy their AIS is crucial sustainable development. The first delves into role in innovation, particularly highlighting how blockchain can revolutionize processes transparency. It then...

In this paper, an accurate and computationally implicit 3D finite-difference time-domain (FDTD) method based on the unconditionally stable Crank–Nicolson scheme (3D CN-FDTD) is presented. The source excitation in CN-FDTD described numerical simulation of demonstrated through examples. results method, ADI-FDTD traditional FDTD schemes are compared. A good agreement obtained for with time steps greatly more than Courant–Friedrich–Levy (CFL) limit Yee method. © 2006 Wiley Periodicals, Inc....

The programmable graphics processing unit (GPU) is employed to accelerate the unconditionally stable Crank-Nicolson finite-difference time-domain (CN-FDTD) method for analysis of microwave circuits.In order efficiently solve linear system from CN-FDTD at each time step, both sparse matrix vector product (SMVP) and arithmetic operations on vectors in bi-conjugate gradient stabilized (Bi-CGSTAB) algorithm are performed with multiple processors GPU.Therefore, GPU based BI-CGSTAB can...

An equivalence principle algorithm (EPA) method is extended to analyze the electromagnetic scattering from multiple bodies of revolution (MBoR) with axes arbitrarily oriented. Equivalence spheres are used enclose each BoR and currents expanded by basis functions (BoR). To obtain operators translation EPA for Fourier modes independently, rotational symmetry systems established in local coordinate systems. The origin system located at center sphere z-axis coincides axis enclosed operator...

The analysis for large-scale antenna arrays is a hot topic design and optimization. In this paper, an efficient method analyzing by using characteristic mode (CM) proposed. order to analyze common antennas composing of conductor dielectric, the theory CM first introduced into volume-surface integral equation. An auxiliary general eigen-equation established make modes orthogonal. Furthermore, source (SM) constructed modify accuracy when CMs expand currents excited delta gap problems. To...

Electromagnetic waves carrying orbital angular momentum (OAM) have drawn much attention in the fields of radar detection and wireless communication. In such applications, vortex beams with multiple OAM modes need to be transmitted received at same time. This communication introduces shared-aperture concept into metasurfaces for generating different modes. Two independent geometry phase profiles on aperture are utilized modulate two orthogonal linear-polarization waves. The alliance...

Due to the significance of electron and heat transfer in designing nanoscale semiconductor devices, transient analysis electrothermal properties has attracted extensive attention. In this paper, density-gradient dual-phase-lag (DPL) equations are first combined predict transport transistors. The DPL equation is solved with consideration temperature jump boundary condition that dealing phonon-wall collisions. We have shown temporal spatial distributions related physical variables can be...

A wideband metasurface antenna operating at millimeter-wave spectrum in substrate-integrated waveguide (SIW) technology is proposed. Coupled by a slot etched on an SIW section, the proposed achieves wide 10 dB impedance bandwidth simulation from 19.2 to 42.4 GHz, indicating fractional of 75%. The development can be divided into four stages, i.e., antenna, dielectric loading, adding covered metasurface, and connecting transition. input resonance these stages are elaborated detail explain...

Background: The entity-attribute-value representation with classes and relationships (EAV/CR) provides a flexible simple database schema to store heterogeneous biomedical data. In certain circumstances, however, the EAV/CR model is known retrieve data less efficiently than conventionally based schemas.