Quantum-Like Criticality in Granular Fluids

Abstract

Quantum criticality is one of the most intriguing features of quantum mechanics and is often associated with phenomena such as superfluidity, superconductivity, collective motion and density waves. This paper reports our direct observation of a quantum-like criticality in granular fluids through noise reduction and fluidity maintenance. We present a spectrogram of the nonlinear dispersion relation for granular fluids obtained via propagation of pressure waves. An order-disorder transition in granular fluids is detected by particle image velocimetry (PIV) and optical probes. The influence of this transition on the heat diffusivity in granular fluids is investigated, revealing two modes of heat diffusion above and below the critical granular temperature. Designing such granular fluids to realize quantum-like criticality behavior opens up new avenues to experimentally observe the macro-quantum state even at room temperature and can potentially be applied in industrial multiphase reactors, energy storage, and surface acoustic wave technology.

The state-of-the-art wireless power transmission technology in electric vehicles

“…Here, the resonant principle of LC circuit is used. The resonant topology of wireless charging system can be divided into four types, respectively series-series (SS), series-parallel (SP), parallel-series (PS) and parallel-parallel (PP) [3], as is shown in Figure 4. Four basic compensation topologies are examined.…”

“…When the two plates are close together, an electrical field is generated and an induced current appears at the receiver end. Unlike resonance wireless chargers, capacitive WPT is a potential application choice because it enables efficient energy transfer, even with metal barriers [3]. The general structure is shown in Figure 5.…”

“…Eddy current loss may be disregarded. First, in an IPT system, a high-frequency magnetic field creates eddy current losses in neighbouring metals, resulting in significant warming in low-and highpower applications [3]. In particular, when a IPT system is used to charge the trolley, the power of the system may reach 10 kW, and the huge magnetic field will generate a lot of heat in nearby metal objects, which may cause a fire and damage life and property.…”

“…Figure 1. The basic structure of pure electric vehicles.Currently, the method of charging electric vehicles is mainly wired charging, and electric power is transmitted by charging batteries[3]. After several years of rapid development, wired charging technology has matured.…”