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In cryptography, rekeying refers to the process of changing the encryption key of an ongoing communication in order to limit the amount of data encrypted with the same key.
Đã gửi cách đây 5271 ngàyĐã gửi cách đây 5272 ngàyAll gas analyzers must be calibrated regularly. Most analyzers require zero calibration and span calibration. The zero calibration is performed with a gas that contains none of the analyte gas to which the analyzer responds. For example, pure nitrogen is perfect for zeroing either oxygen or carbon dioxide analyzers, because it contains neither oxygen nor carbon dioxide. Run a steady stream of nitrogen through the analyzer at a low, steady flow rate - typically about 100 ml/min - and adjust the zero control of the analyzer so that the analyzer's display reads zero. Zero calibration gases are therefore, as Steve Jobs would say, a no-brainer. And you can usually pick up very pure nitrogen from local gas suppliers for very little cost. The span calibration is not as simple. A span gas has a precisely defined concentration of the analyte gas to which the analyzer responds.
Đã gửi cách đây 5274 ngàyĐã gửi cách đây 5274 ngàyBesides compatible groups there are also incompatible groups in Chinese astrology. For example, rat and horse do not go together. Similarly dragon and dog are incompatible. Tiger and monkey, ox and sheep, rabbit and rooster and snake and pig are all incompatible with each other.
Đã gửi cách đây 5276 ngàyĐã gửi cách đây 5276 ngàytác giả
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