Computer Sciences Corp. and Nichols Research Corp. yesterday announced they had completed the merger of the two companies. Under the terms of the deal, Nichols shareholders will receive 0.423 shares of CSC common stock for each share of Nichols, according to a CSC statement. Before the merger, CSC was the 19th-largest defense contractor in the nation, receiving nearly $647 million in Defense Department contract awards in fiscal year 1998. Nichols was 50th, receiving nearly $244 million in FY-98, according to...