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MeirG
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re: Brookhaven takes another shot at room-temp superconductors
MeirG   7/23/2010 1:54:09 PM
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Sorry, I meant Mr. Johnson...

MeirG
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re: Brookhaven takes another shot at room-temp superconductors
MeirG   7/23/2010 1:52:49 PM
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Mr. Johns, May I (vaguely) quote Prof. Einstein: "If we knew what we are doing, it wouldn't be science!"

R_Colin_Johnson
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re: Brookhaven takes another shot at room-temp superconductors
R_Colin_Johnson   7/19/2010 7:34:22 PM
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Superconductivity insights have built up so many false hopes over the years that they are hard to take seriously anymore. Researchers have repeatedly published "breakthrough" ideas for room temperature superconductivity that have either flopped altogether, or which only resulted in raising the temperature by a few degrees. Brookhaven National Labs claims its insight is different, since the Lab has revealed an asymmetry reminiscent of the asymmetry that preceded commercialization of LCD displays. While I wish them well, and hope that their insight does lead to room temperature superconductivity, I personally am not holding my breath. Instead I am reciting the matras my grandmother continually spouted about "crying wolf," "proof is in the pudding," and "fool me once, shame on you, fool me twice, shame on me."



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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