The Dow industrials and the technology sector managed modest gains Tuesday but the broader market closed near its 2018 low in a highly volatile session in which equities surged early, turned negative, and rebounded somewhat. The Dow Jones industrial average rose 82.66, or 0.35 percent, to 23,675.64. The broader Standard & Poor's 500 index was virtually unchanged, rising 0.22 to 2,546.16, close to its 2018 low. The technology-heavy Nasdaq composite index rose 30.18, or 0.45 percent, to 6,783.91.