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The interaction between catalyst and support plays an important role in electrocatalytic hydrogen evolution (HER), which may explain the improvement in performance by phase transition or structural remodeling. However, the intrinsic behavior of these catalysts (dynamic evolution of the interface under bias, structural/morphological transformation, stability) has not been clearly monitored, while the...
Coal has a strong adsorption capacity, adsorbed gas in coal seam is mostly CO2, CH4 and N2, only a little is CO. In upper corners and some other spots of mining face of some mine CO often transfinite, but due to being unclear about its source, fire preventing and controlling measures are often inefficient which directly threat safe production of coal mine. through determining and analyzing data of...
In this paper, the relationship between 3db bandwidth and pulse-width, and the relationship between pulse-width and ratio of energy in the microwave spectrum to whole pulse energy, are presented. It is clear to reveal the picosecond EMPs' bandwidth increase exponentially as pulse-width decreasing under 100ps. The picosecond pulses have great potential interference on the traditional microwave devices...
Design and development of a structure like Chinese character “t” for wide angle scan phased array with high gain and performance easily realizing direction reconfiguration is presented. The new structure satisfies the requirements on the maximum reflection coefficient of Γ ≦ 20 dB for a half power beam-width of ±60º in E-plane and ±57.5º in H-plane with a moderate gain of 7 dBi. Having confirmed the...
A new structure like the Chinese character “t” for wide angle scan with high gain has been developed based on PIN diodes. The size of the structure and the reconfigurable mechanism are present in the details. The antennas from the structure satisfy the requirements on the maximum reflection coefficient of Γ ≦ 20 dB for ±60° and ±57. 5° from a broadside in E- and H- planes with a moderate gain of 4–7...
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