Persistent pockets of polio transmission in northern Nigeria and along the border between Afghanistan and Pakistan are key epidemiological challenges.

尼日利亚北部以及阿富汗与巴基斯坦边界地区脊灰的持续小面积传播提出了重要的流行病学挑战。

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Persistent pockets of polio transmission in northern India, northern Nigeria and the border between Afghanistan and Pakistan are key epidemiological challenges.

印度北部、尼日利亚北部以及阿富汗与巴基斯坦边界地区脊灰的持续小面积传播提出了重要的流行病学挑战。

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Based on quantum waveguide theory, the effect of impurities on the transmission probability and the persistent currents in mesoscopic structure is studied.

采用量子波导理论，研究了介观结构中杂质对透射几率和持续电流的影响。

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