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However , it is not clear if cells in V1 also generalize over the various types of illusory contour figures and if they signal the contour orientation . These analyses include deadweight ( evaluating the supports of the existing equipment weight ) , thermal ( the stresses produced by thermal expansion ) , loss of coolant accident ( the possibility of a sudden breakage in the piping ) , and seismic loading on the reactor coolant primary loop , fracture mechanics analysis to evaluate reactor vessel head penetration cracking , and finite element stress analysis to ensure structural integrity of the reactor vessel head assembly . For example , a btree index on four-byte integers would use the int4_ops class ; this operator class includes comparison functions for four-byte integers . But we have recognised that our country cannot hope to prosper by having recourse to autarky . This is known as the aperture problem .