For the younger generation, social media has turned on-demand, personalized help into an expectation.
That means that, theoretically, your friends can find out where you are (if the feature is turned on) on demand.
When a device say, a power tool or a car is turned on and demands energy, the battery discharges: Lithium atoms in the graphite give up electrons, which travel through the external circuit to the cathode.
Gas peakers, turned on only when demand is at its highest, are the most expensive fossil-fuel plants.
And the marginal plants turned on to meet peak demand are often less efficient and more polluting than the power generators that run around the clock.
A few years ago the solution appeared to be that we would invest large amounts of money in new renewable technologies (alongside new nuclear power) with a few gas stations that could be turned on during times of increased demand or lack of supply.
In doing so he displays more than a hint of the on-screen menace that he seems able to turn on whenever his roles demand it.
The bigger challenge for a director is to convey Scarpia's other side, the aristocratic bearing and courtly manners that he can turn on as the occasion demands.
By Carrie Battan On many songs, a love interest acts as a stand-in for a public that has turned on him, demanding apologies and repentance.
Other new features include support for taking screenshots with notes, Vivaldi's annotation tool, as well as new page actions (another power user feature) that let you turn on on-demand image loading on a slow connection, control text size and color, or block content.
Therefore, we turned to on-demand frozen-section analysis, i.e. the surgeon performing the biopsy assessed the tissue specimen macroscopically as normal brain or pathological tissue sample and, when uncertain, requested the neuropathologist for intraoperative confirmation.
