996 resultados para 183-1140A


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过渡金属离子取代的杂多钨酸盐,具有金属叶啉的类似结构,在烯烃环氧化反应中具有比金属叶啉更优异的催化活性和选择性,特别重要的是其抗氧化性能强,在烯烃基质存在下比金属叶啉稳定,催化寿命持久,并称其为无机金属叶啉,因而引起人们的极大关注.

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State aid - Tax exemption on earnings from exports - Recovery

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This paper reports the design of a Frequency Selective Surface (FSS) which simultaneously allows transmission of 175.3 – 191.3 GHz radiation and rejection from 164 - 167 GHz with a loss <0.5 dB for TE wave polarization at 45° incidence. The state-of-the art filter consists of three air spaced perforated screens with unit cells that are composed of nested resonant slots. The FSS satisfies the stringent electromagnetic performance requirements for signal demultiplexing in the quasi-optical feed train of the Microwave Sounder (MWS) instrument which is under development for the MetOp-SG mission.

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Servicios registrales

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Brown sediment with clasts ranging from small to large. Clast shape ranges from sub-angular to rounded. Rotation structures and necking structures are abundant throughout the sample. A few lineations can also be seen.