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A conservative estimate of the uncertainty at + / -20 ns ( 95 % ) was obtained , dominated by considering the drifts in the equipment since the last differential calibration , in comparison with similar systems , for example the known drift rates between two-way equipment and GPS receivers . The DRIFTS technique has a wide sampling range ( ppm to neat ) and is particularly useful for the analysis of powders . In actual simulations , the conserved quantity changes slightly on each timestep because of the finite timestep of the calculation , but there should be little or no drift over time . What makes my brother 's eschatology impossible for me is that he identifies everything that is occurring in history ( the drift toward disaster , another world war and possibly a revolution ) with the counsels of God , and then suddenly , by a leap of faith , comes to the conclusion that the same God uses brutalities and forces , against which man must maintain conscientious scruples , will finally establish an ideal society in which pure love will reign . In the shadows of the city , those drifting on the street disappear and reappear even to those who see them , but Bruckner managed to establish that a woman known only as " Angie " was , in fact , truly missing . Thus we see a reversal of the drift of racial attitudes that had begun with the Revolution and a return to the admission that white men could not tolerate a mixed society unless the Negro was the object of their hostility and control . We again unloaded the canoes and stowed the loading on a rock above the tidewater , and formed a camp on the drift logs which appeared to be the only situation we could find to lee-the hills being either a perpendicular cliff or steep ascent , rising to about 500 feet . Before the drifts were formed too deep for her to pass in and out - and by the morning she judged that they would be six or seven feet deep - she would go out and see after the comfort of her beasts . At early times there is a rapid dispersion of the density , which the drifts down the error surface and spreads out over several basins . But you get the drift , it 's the same everywhere . I've skimped on plot here , because quite a lot of it seemed to me as murky as the drifts of manufactured fog that go floating through every other scene . We will have seed viruses reflecting this drift that can be quickly available for vaccine testing and production . No drift in heat flux or temperature was noted for the last 150 hours of the test .