But Democrats said the subpoena push signals their intent to continue digging into the firings.
In order to make new parts of the spectrum-outside the central band-usable, researchers must develop new versions of devices that help push signals along optical fibers.
The protesters, some wearing jerseys honoring Barcelona and its Argentine star, Lionel Messi, said the Palestinian push signaled progress regardless of the outcome in Zurich.
Even so, the renewed diplomatic push signals a significant shift in Mr. Obama's strategy since he came to office in 2009 and increased American forces in Afghanistan to nearly 100,000 troops, from 34,000, in an effort to crush a resurgent Taliban insurgency.
Now physicists, reporting in the current issue of Physical Review Letters, have built an electronic model demonstrating how noise might play a key role in communication among neurons in the brain, by helping to push signals from cell to cell.
Two theories existed as to how this repression worked: The brain could send a positive "push down" signal to the arm muscles at the same time as the involuntary "lift up" signal was being transmitted to cancel it out; or the brain could entirely block the involuntary signal at the root of the nerves.
Watson had an advantage, in that he was able to push the signal button much faster, and so was able to respond to almost every answer.
Amplifiers on the line also help push the signal along, says Mark Peden, a board member for an industry consortium aimed at making DSL a mass-market technology.
It is possible to "push" much signal processing out to hubs in order to increase the efficiency of the headend-to-hub links, or to centralize the processing for easier management at the expense of needing more fiber capacity.
Mitt Romney is moving quickly to reassemble his national political network, calling former aides, donors and other supporters over the weekend and on Monday in a concerted push to signal his seriousness about possibly launching a 2016 presidential campaign.
