According to the nonlinear response characteristics of magnetron, this article proves that a 2.45 GHz band continuous-wave magnetron can perform as modulator in communication system. The intermediate frequency (IF) signal coupled power supply ripple anode voltage, be modulated nearby centered on resonant magnetron. We deduced output expression free oscillating under influence voltage ripple. And electromagnetic simulation was accomplished testify validity theoretical derivation. Moreover, we...

AbstractThe majority of microwave ovens on the market are powered by magnetrons, which can only produce a narrow-band frequency that has large peak, resulting in poor uniformity. A method is proposed to improve nonuniform heating based nonlinear response characteristics magnetron multi-frequency. First, multi-physics model established realize calculation multi-frequency heating. Second, experimental system built and verified with calculated results. The results show good agreement Finally,...

How to reshape the cross-border agricultural supply chain is a common concern in global field. Using bibliometrics method, 761 studies literature were selected from core database of WOS (Web Science) explore research hotspots and development trends this field, clarify historical context, future trends. knowledge map visualization software CiteSpace, an in-depth review analysis hot topics field conducted. The results showed that since 2017, has shown strong trend. United States University...

The number of electric vehicles (EVs) is expected to increase significantly in the near future, which will affect operation future power networks. This study investigates impact EVs on distribution network voltage profile by collecting measurements from residential, slow commercial, and fast public EV charging stations throughout annual cycle. It revealed data that utilization factors for are 89%, 55%, 24%, respectively. optimal flow solutions have been presented without with (home, public)...

In this paper, three types of stirrers are analyzed and compared in terms the field uniformity a reverberation chamber (RC). The first type (i.e., Type I) is standard Z-type rotating mode stirrer consisting four metal plates. second II) similar to stirrer, yet with two plates clockwise other counterclockwise. third III) translating rectangular plate. For fair comparison, we make sure that volumes swept by same. used compare performances stirrers. Then, comparison stirrers' carried out get...

<title>Abstract</title> Chitin, distinguished by its nitrogen-rich acetamido and amino groups, imparts a distinctive cationic nature, enabling chitin with indispensable features in various applications. However, the degree of deacetylation (DD)- key molecular-level structural determinant- has not been adequately addressed prior studies despite critical role influencing chitin's properties across multiple scales. Here, controlling acetylation, we achieved extensive tunability regenerated...

Motivation: NMR field probe methods for monitoring are limited by signal loss due to relaxation, dephasing, or both. Goal(s): To develop a method characterizing sequences with higher resolution readout length than allowed current approaches. Approach: Long-duration 2D spiral gradients were characterized acquiring and stitching multiple segment-specific dynamic measurements per segmentation of the gradient determined model. Results: For both long-duration ultrahigh-resolution readouts, our...

Two novel neutral phosphorescent iridium(III) complexes (Ir1 and Ir2) were rationally designed synthesized with high yields using 10,11,12,13-tetrahydrodibenzo[a,c]phenazine as the main ligand. The two showed bright red phosphorescence (625 nm for Ir1, 620 Ir2, in CH2Cl2), luminescence quantum efficiency (0.32 0.35 Ir2), obvious solvatochromism good thermostability. Then, they used to fabricate high-efficiency OLEDs via vacuum evaporation, maximum CE, PE, EQE of devices based on Ir1 Ir2 are...

Contact erosion, or interfacial often occurs in layered foundations composed of coarse and fine layers; it refers to the phenomenon that particles layer are detached by flow parallel interface transported through pore channels layer. To visualise initiation progression contact erosion at internal soil strata, transparent model tests were employed simulate real soil, a series was conducted on double-layer different layers. Based test results, commonly used geometric hydraulic criteria for...

Abstract. To improve the control performance and dynamic response of permanent magnet linear synchronous motor (PMLSM), a new sensorless strategy PMLSM with ultra-local model velocity system is designed in this paper. Firstly, model-free speed controller (MFSC) constructed based on principle model. Meanwhile, traditional sliding-mode observer (SMO), back-electromotive force (BEMF) SMO optimized by reference adaptive (MRAS) to observed information PMLSM. This improves ability stability...

Along with the development of Long term evolution (LTE) communication system, higher linearity and efficiency base station power amplifier required. Although, Conventional Doherty can't meet this requirement. For first time, This is use Envelope tracking (ET) technology used to dynamically control gate voltage peak amplifier: at low input, supplied peaking amplifier, aiming improve efficiency: on other hand, high obtain efficiency. Compared traditional new design could without decreasing In...

This paper proves that a 2.45 GHz band continuous-wave magnetron has the non-linear response characteristic to frequency of anode voltage ripple. We deduce output and expression free oscillating under influence high-frequency The reveals can realize shifting Sidebands will appear on both sides central magnetron. difference between sideband center is ripple frequency. Finally, an experimental system accomplished testify theoretical derivation. research promised apply simultaneous information...

The article focuses on the study of virtual power plants (VPP) participating in electricity market region. Based traditional centralized trading model, considering connection between plant and grid, contact line constraints are added process to make model closer reality. Meanwhile, order fully protect interests plant, while constraints, peer-to-peer (P2P) aggregators was established realize resource synergy within plant. Compared with directly processing transaction results through way equal...

Ultra-dense network (UDN) can meet ultra-high peak rate, traffic density and by densely deploying low-power base stations (BSs). The traditional iterative search water filling (ISWF) algorithm requires many iterations to obtain the optimal power allocation. We adopt a low-complexity (LAWF) reduce iterations. propose sorting (SWF) algorithm. simulation results show that sum rate achieved LAWF SWF are better than ISWF. With deployment of UDN, speed presentation SWFs increasing.

With the depletion of traditional fossil energy, low efficiency and unsustainable production, energy has shown many shortcomings. A regional terminal system (RTES) can improve comprehensive utilization promote development renewable meet needs different application scenarios. In this paper, index method technical economic evaluation RTESs are studied. Firstly, typical structural characteristics RTES constructed analyzed; secondly, is from aspects efficiency, economy, environmental protection...