The notch in the sample affects the results of the impact test, thus it is necessary for the notch to be of regular dimensions and geometry. The size of the sample can also affect results, since the dimensions determine whether or not the material is in plane strain. This difference can greatly affect conclusions made.
At any point if you would like to enable touch screen functionality again, simply go back to the Device Manager, right-click HID compliant touch screen, and select Enable. Remember, you will be required to restart your PC to enable the touch screen functionality again.
Finding the Lock Screen Settings. Probably the easiest way to activate this screen is to left-click your account's icon, then select 'Lock' from the drop-down menu. However, if you want to Personalize this screen you need to find the underlying Lock screen options. This involves the Windows 8 Settings, thus begin with WinKey +w. Alternatively, at the Metro start screen, type 'L o c k', but then switch from Apps to Settings, see screenshot right.