Studies show that the detection of vector turbulence characteristics is of significant importance for further cognition of the marine turbulence mechanism. However, a succedent research process may be impeded by the detection dimensionality of existing marine turbulence sensors. In the present study, a vector high-resolution turbulence sensor (VHTS) is designed from a cilium-shaped structure. The designed VHTS is based on the bionic principle and the MEMS manufacturing technology. A systematic investigation is conducted to improve the VHTS and meet the stringent requirements in marine applications. The measuring sensitivity and natural frequency of the VHTS are balanced by performing theoretical analyses and numerical simulations. Moreover, the vector detection mechanism of the sensitive microstructure is analyzed. Then the designed VHTS is fabricated and encapsulated elaborately by MEMS processes and three-dimensional heterogeneous integration. The calibration experiments show that the sensitivity of the designed VHTS is up to 2.68 × 10 −2 (V•m•s 2 )/kg. The vector verification testing exhibits the excellent orientation behaviors of the designed VHTS, indicating the feasibility of the VHTS to realize the detection of vector turbulence characteristics. The present study may provide a new opportunity for accurate observation and mechanism cognition of turbulence.
-This study overviewed current researches on power system applications of SMES systems. Some key schematic diagrams of applications were given, too. Furthermore, the authors tried to present a few valuable suggestions for future studies of SMES applications to power systems.Index Terms -Power systems, superconducting magnetic energy storage (SMES),
Triboelectric nanogenerators (TENGs) are effective for harvesting mechanical energy and converting into electricity. Such devices have high output voltage and low current, appearing as high output impedance. Impedance mismatches involving these devices create challenges in power usage, storage, and management. Herein, a dual‐tip‐assisted TENG is developed and its electrical output performance under airtight condition is investigated. The generated charges can rapidly accumulate at the dual tip and produce a high potential difference. Such a potential difference accelerates the induced charges’ transfer speed and quantity. Gas discharge occurs once the potential exceeds some threshold, providing a conduction path for accumulated charges. With the help of such dual‐tip peak power multiplier, TENG's peak‐to‐peak short‐circuit current and open‐circuit voltage are 433% and 145% higher, respectively. The peak power reaches a maximum of 34.8 mW with a 100 kΩ load resistance, whereas that of the original TENG is 1.5 mW with a 100 MΩ load resistance, indicating 22.2 times of peak power increase and an optimal matching impedance decrease by three orders of magnitude. The results indicate that this multiplier is meaningful for the optimization of TENG's output and impedance.
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