The threshold voltage is positive after a program operation, in what may be defined as the logic "0" state.

在编程操作之后阈值电压为正，其可界定为逻辑“0”状态。

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Extinction ratio is ratio of logic "1" average optical power to logic "0" average optical power under the worst reflection and complete modulation condition.

消光比是指在最坏反射条件时，全调制条件下，逻辑“1”平均光功率与逻辑“0”平均光功率的比值。

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Among the largest underlying components of SOXL, in trading today Advanced Micro Devices, Inc. ( NYSE: AMD) is off about 0.4%, Broadcom Corp. ( NASD: BRCM) is down about 0.6%, and Cirrus Logic, Inc. ( NASD: CRUS) is lower by about 1.9%.

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But applying the same logic to Japan, where growth has averaged only 0.7% a year over the past seven years, compared with a previous trend rate of 3-4%, one could argue that Japan's output has already fallen by as much as 15-20% relative to its previous trend.

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That logic seemed to work in January 2001 when the ratio hit a high of 0.97, suggesting that investors thought the index was ready to take off.

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