在邮票的票面上凿出有关文字或图形的孔洞,称凿孔,主要是用以标明特殊用途及防盗,如公文凿孔、欠资凿孔、样票凿孔、公司略字凿孔及防盗凿孔等。
...离与最大似然6.6.2结(tie)的消除与信息量损失6.6.3似然度量的 计算6.7维特比译码的回溯(Traceback)方法6.8凿孔(Punctured)卷积码6.8.1齿孔6.8.2好的凿孔卷积码6.9小结6.10习题参考文献第7章网格编码调制7.1多幅度/多相位离散无记忆信道7.1.1I-Q调制7.1.
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与在电极上凿孔不同的是,他们在电极上覆盖一层碳纳米管,每个只有5纳米(十亿分之一米)宽。
Instead of digging holes in the electrodes, they are coating them with a forest of carbon nanotubes, each five nanometres (billionths of a metre) wide.
在水尚未流经缆绳前,研究团队无法确定,融化的水是会流入粒雪中,还是会聚积在钻头的周围。如果是后者,将会使凿孔因冻结而封闭。
Until water flowed through the tether, the team could not tell if the meltwater was draining into the firn or accumulating around the drill, which could freeze the borehole shut.
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