Glomalin-related soil protein (GRSP) is a hydrophobic released by arbuscular mycorrhizal fungi. It an important component of the carbon pool, and it improves aggregate structure; however, remains unclear whether GRSP can enhance sequestration improve quality during rapid urbanization. The built-up area in Nanchang, China was study area, proportion impervious surface parameter urbanization intensity. A total 184 plots (400 m2) were set up to collect samples (0-20 cm) for analysis. Aggregates...

A high-gain transmit-reflect-array (TRA) antenna with asymmetric bidirectional beams using sparse-array method is presented in this communication. The proposed element consists of three-layer hexagonal-ring-patch (HRP) structure, able to achieve both amplitude (0 or 1) and phase modulation. Based on kind a 125 mm × square-shaped TRA designed fabricated. 45.3% the radiation units operate transmission mode while others reflection mode. Spatially fed by conical horn antenna, two well-defined...

A novel compact millimetre-wave 32-way ring-cavity power dividing/combining circuit is presented. The dividing function and the symmetric electromagnetic-field excitation investigated. U-band passive combiner developed with reasonable agreement between simulated measured results.

This letter presents a planar, low-cost microwave ablation antenna operating at 2.45 GHz with the minimal cross-sectional area. The proposed can produce local spherical zones by double dipole structure, which is fed through substrate-integrated coaxial line (SICL) without balun. input impedance of in fact extensions outer and inner conductors SICL, very low. SICL mismatched structure when designed as smallest Impedance matching achieved microstrip cascaded SICL. A prototype fabricated...

This communication proposes a reconfigurable reflectarray (RA) with decoupled right-/left-handed circularly polarized (RHCP/LHCP) 2-D beam steering. A simple-structured unit mechanical reconfigurability is designed to achieve the 1 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 1-bit dual-circularly (dual-CP) phase modulation, which enables scanning of dual-CP beams....

Abstract This letter presents the design principle and experimental verification of a Ku‐band wideband low‐profile dual‐circularly polarized (dual‐CP) reflectarray (RA) with independent control left‐/right‐handed circularly (LHCP/RHCP) beams. Both dynamic phase (DP) Berry (BP) compensating methods are employed in unit cell, achieving LHCP/RHCP modulation based on single‐functional‐layer concept. A single‐layer cell is designed, offering ‐bit dual‐CP shift which facilitates prototype...

Abstract A single‐feed wideband circularly polarized (CP) substrate‐integrated waveguide (SIW) cavity‐backed antenna and its phased array are presented in this paper. The proposed element consists of SIW cavity, stacked patches, a 50‐Ω coaxial probe. pin is directly connected to the two patch radiators. By chamfering on each rectangular patch, realizes circular polarization characteristic. exhibits simulated impedance bandwidth 22.5% (14–17.6 GHz) for | S 11 &lt; −10 dB, an axial‐ratio (AR)...

By introducing coordinate transformation into geometrical theory of diffraction (GTD), the problem calculation power coupling between correspondingly skew paraboloid antennas is considered. The configuration means there an angle axes two antennas. It illustrated by considering identical front-fed symmetric antennas, each which fed a TE11 mode circular waveguide. result can be used as guidance for installation disposition multiple

With the upgrading of consumption and transformation traditional supermarkets, new retail war is becoming more fierce. In such an environment, it important to improve customers' satisfaction degree supermarkets cultivate customer loyalty promote accelerated development industry. Based on structural equation model, this paper collects customer's willingness data through questionnaires, establishes a model influencing factors. Besides, SPSS24.0 AMOS24.0 statistical software are used analyze...

A compact low insertion loss vertical transition and power divider (PD) using millimeter wave circuit/module is presented. Substrate integrated circular cavity (SICC) employed to improve the performance of PD structure. Two different 3D simulation tools are validate design method

This article presents two miniaturized multimode waveguide bandpass filters (BPFs) based on epsilon-near-zero (ENZ) channel concept. By connecting parallel shorting stubs the ENZ channel, multiresonance modes and one transmission zero (TZ) are introduced, broadening bandwidth of passband upper stopband, respectively. The effect arbitrary discontinuity this resonant mechanism is analyzed, effective size reduction third-order filter achieved with folded channel. design procedure...

In order to ascertain the impact of Tohoku-Oki 3.11 M9.0 earthquake on stability faults in Beijing Plain, we investigated adjustment situ stress field Plain after this based monitoring data. Then, analyzed five main each stage Mohr−Coulomb failure criteria and Byerlee’s law. Finally, studied fault slip potential (FSP) under current field. The research results show that (1) earthquake, tectonic environment area changed rapidly from nearly EW extrusion extension, state was maintained until...

Abstract Transmitarray (TA) antenna has great research value based on its unique advantages of low profile, high gain, and flexible performance, especially in the field spaceborne, airborne, unmanned aerial vehicles. Unfortunately, traditional TA antennas are usually flat structures, which lack conformal flexibility installation simplicity certain complex application scenarios. In this letter, a broadband bifocal is proposed designed concave‐cylindrical‐shaped triple‐layer surface with phase...

Abstract Most planar absorbers are designed under normal incidence, leading to a sharp decline in absorber performance oblique especially when the incidence angle exceeds 30°. Three‐dimensional structured ensure of but they lack practicality due their complex processing and assembly. In this letter, tightly‐coupled (TCPA) is proposed. Its design method combines reciprocity principle structure, incorporating wide‐angle matching layer interdigitated structures improve absorber's incidence. A...

The paper takes a 110kV power transformer as the research object and obtains permeability characteristics of iron core under frequency variation through numerical calculation. Then, frequency-related parameters winding inductance were calculated by establishing finite element model. A trapezoidal equivalent circuit model considering is established using double cakes units, response obtained analysis modeling. results indicate that due to influence eddy current effect, undergoes...

Uninterruptible Power Supply (UPS) is a kind of equipment that can supply power to other equipment’s in an uninterrupted way, which ensure the key continue operate stably face grid failure. Therefore, uninterruptible system utmost importance modern system. The aim this paper optimize rectifier circuits rely on three-phase bridge full-wave circuits. Build model using LTspice and simulate it, compare analyze waveform characteristics output voltage load under different filtering schemes,...

Abstract In this paper, a frequency selective surface (FSS) based shared-aperture antenna is designed for 5G/Wi-Fi applications. The 5G and Wi-Fi channel are separated to achieve different polarizations simultaneous work. proposed of ±45°-polarization in the N79 band vertical polarization Wi-Fi5.8 GHz band. vertically stacked with located above antenna. composed FSS units transmissive characteristics band, serves as an electromagnetically transparent avoid blocking A prototype our design...

In this letter, the reflection elements based on artificial dielectric layers (ADLs) are proposed for broadband wide-angle bistatic radar cross section (RCS) reduction. ADLs introduced to improve interference cancellation bandwidth of elements, and avoid dilemma mixing multiple mediums. The achieve an approximate 180° phase difference over frequency range 4.8–17.5 GHz (113.9%) under normal incidence, TE 40° incidence TM 55° is 113.9% 100%, respectively. To validate design, a coding scatterer...

In order to promote the development of Chengdu tourism resources, this paper based on text mining, using content analysis method conduct qualitative research network evaluation tourism.The ROST CM6 software is used perform high-frequency word analysis, semantic and sentiment text, visitors' perception Chengdu' s tourist destination obtained.Combined with characteristics resources in Chengdu, puts forward some suggestions for improving full utilization Chengdu.

A broadband Bessel lens antenna with stable quasi-nondiffraction range and considerable characteristics is designed fabricated. The theoretical basis operating principles for the near-field are introduced. Then, design procedure structure of discussed in detail. Considering influence oblique incidence waves, phase shifts elements different incident angles simulated, interpolation analysis method applied modeling to minimize error. proposed can be used as a beam launcher at 26-32 GHz....

The soil engineering geological characteristics and hidden fault creep activity are the main factors affecting stability of Beijing–Zhangjiakou high-speed railway foundation. In order to reveal deep formation structure physical mechanical properties under foundation explore influence settlement static load dynamic railways, according deep-hole drilling test, this paper reveals within a 500 m buried depth Huailai section railway. Based on data, we constructed 3D model across segments study...