Abstract A thin metasurface has shown powerful capabilities in controlling either incident electromagnetic (EM) waves or radiation waves, but is difficult for both. Here, a self‐feeding Janus (SFJ‐MS) proposed to manipulate the EM and emit radiated simultaneously, which can realize polarization conversion of scattering control, wave radiation, radiation‐beam steering. On upper SFJ‐MS, diagonal‐split square ring rectangular patch with rotation are designed introduce anisotropy meta‐atom...

Abstract Due to the strong ability of recognizing electromagnetic (EM) environment and adaptively control EM waves, intelligent metasurfaces have received great attention recently. However, metasurface with frequency recognition for adaptive manipulation waves has not been studied. Here, we propose a frequency-recognition precisely spatial under agile frequencies help real-time radio-frequency sensor an feedback system. An active meta-atom is presented reach 2 bit phase coding 1 amplitude...

Heavy metal contamination in water and soil has gradually become a concern with the development of industry recent years may pose serious threat to human health if left untreated. Biochar is commonly used as an adsorbent/immobilizer heavy metals from substrates because its wide—ranging raw materials, low production cost, good adsorption performance. Based on mechanism biochar, this paper analyzes different modification methods aiming provide effective material for treatment sediment certain...

Abstract Metasurface holography has been well studied due to its features that are superior the traditional holographic technologies. However, high profiles of reflection‐ and transmission‐type configurations in metasurface restrict applications. On other hand, digital coding metasurfaces have received great attention recently because they build a link between information theory surface electromagnetic fields, which also bring new viewpoint convenience for computational holography. Here,...

A design method of programmable transmitarray with independent controls transmission amplitude and phase is proposed in C-band. The unit cell cascaded structures mainly consists four parts, including the receiving antenna, reconfigurable attenuator PIN diodes, shifter varactors transmitting antenna. Correspondingly, various manipulations spatial electromagnetic (EM) fields are achieved by varying bias voltages diodes transmitarray. fabricated measured a standard waveguide, whole array 8*8...

Metasurfaces have been developed as a promising approach for manipulating electromagnetic waves. Recently, deep learning algorithms introduced to design metasurfaces, but the network can only output one solution each desired input and suffers from nonunique issue. To overcome aforementioned challenges, neural model inverse designs of anisotropic metasurfaces with full phase properties in ultrawideband is proposed. Given target reflection spectra inputs, candidate metasurface patterns are...

With the development of artificial intelligence and Internet Things, hand gesture recognition techniques have attracted great attention owing to their excellent applications in developing human-machine interaction (HMI). Here, authors propose a non-contact method based on intelligent metasurface. Owing advantage dynamically controlling electromagnetic (EM) focusing wavefront engineering, transmissive programmable metasurface is presented illuminate forearm with more spots obtain...

Recently, increasing attention has been paid to heavy metals in sludge. However, limited literature could be found on the distribution characteristics of sludge and their potential risks. In this study, sludges from wastewater plants Jiangsu Province (China) were selected for investigation metal loadings, showing that typical levels order Zn > Cu Cr Ni Pb As Hg Cd, ranging 154 2970 mg/kg, 28 1150 10 136 9 262 0 79 12.1 41.6 0.67 19.50 mg/kg 0.21 2.77 respectively. Analysis indicated Hg,...

In the past decades, metasurfaces have opened up a promising venue for manipulating lights and electromagnetic (EM) waves. field of nonlinearity, second-harmonic generation (SHG) is research focus due to its diverse applications. There been many researches realizing SHG in optical regime using nonlinear characteristics materials, but efficiency low. microwave frequencies, SHGs are basically studied guided-wave systems. Here, high-efficiency spatial waves presented frequency metasurface...

The higher heating value (HHV) was an important factor for measuring the energy recovery price of sewage sludge, which commonly determined by oxygen bomb calorimeter; however, there were problems time consuming and high measurement cost. In this study, a back-propagation neural network (BPNN) model based on proximate ultimate combination analysis developed to predict HHV sludge accuracy illustrated using statistical analysis. results showed that BPNN had good accuracy, with regression...

We propose a novel approach for achieving joint detections of frequency and direction arrival (DoA) in wideband using single sensor based on an active metasurface with programmable transmission states pass stop. By integrating two p-i-n diodes the opposite directions into proposed single-layer ultrathin meta-atom, performance 10 dB difference between stop is realized bandwidth from 5.9 to 8.8 GHz field-circuit cosimulations. Accordingly, random receiving patterns are generated by controlling...

In next-generation mobile communications, space-air-ground integrated networks (SAGINs) is an emerging infrastructure in future wireless access networks. Since artificial intelligence (AI) applications become more and important, it essential to build a deep learning service-oriented SAGINs. this article, we present hierarchical intelligent computing structure focusing on processing tasks An optimization strategy also proposed improve the quality-of-service (QoS) of structure. We test our...

The electromagnetic (EM) beam manipulations such as spatial scanning have always been the focus in information science and technology. Generally, transmitting receiving (T/R) beams of same aperture should be coincident due to reciprocal theory, hence, more flexible controls are limited accordingly. Here, we propose a new approach achieve independent T/R channels based on one made by nonreciprocal programmable metasurface. meta-atom is designed propagation chains for waves introducing...

Abstract The electromagnetic (EM) controls of spatial nonreciprocal performance have gained much attention due to the extreme attraction unusual physical phenomenon. Especially, emergence metasurfaces, has enormously promoted design manipulating wave and field achieve various EM functions. Herein is proposed a method realize manipulation for polarizations using an active metasurface which elaborately integrates elements power amplifiers. can distinct transmission appearance polarizations....

We propose an anisotropic digital coding metasurface to realize arbitrarily polarized retro-reflections. With the theoretical support of generalized Snell's laws, proposed shows excellent performance retro-reflections through reflection phase design. A modified metallic Jerusalem cross structure is employed achieve required profile under oblique incidence due its good in polarization isolation. By changing length particle's arms, particle can be digitally named as '00', '01', '10' and '11'...

The thermal character of the interface between rail and armature significantly affects launch performance electromagnetic railguns. In this paper, friction coefficient μ brass aluminum is discussed; it found that, under hypervelocity electrical contact conditions, maintains an order magnitude 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> or less, which smaller than that normal conditions. A 2-D simulation model developed to analyze...

Recently, due to the abundance of carbon, nitrogen and phosphorus in municipal sewage sludge (MSS), energy potential MSS has become increasingly prominent. Economically developed regions possess more financial policy support advantages for development recovery technology; hence, selection appropriate treatment disposal technologies maximize is great importance. In this study, was evaluated on basis regional economies, analysis, a main reuse technology review legislative profile analysis. As...

Impedance metasurface can establish a link between an electromagnetic surface wave and spatial hence has attracted much attention of researchers in recent years. The holographic method, which is well known the optical area, also great ability to shape radiated beams microwave band by introducing concept impedance. Here, we propose method at two different wavelengths using single-layer multiplexing impedance with in-plane feeding. For one wavelength, generated broadside beam far field...