Some advanced bits have thrust bearings that can change the angle of the cutting head to provide precise control. Improvements in downhole position measurement based on inertial navigation, and real-time telemetry of data back to the surface now allow drill crews to precisely place and accurately ...
Atmospheric researcher Ivana Cvijanovic also ran computer simulations of a warmer Arctic, at the Lawrence Livermore National Laboratory in California where she works. She found that air circulation over the eastern Pacific could change in a two-step process that ends...
Debt allows a steep step-up in standard of living, such as that obtained by adding coal or oil to an economy.Debt allows goods to be purchased that will substantially change a person’s future, such as transit to a new country, or purchase of a college education, or purchase of a deli...