Joy Global Inc. reported Wednesday that net income for the fiscal fourth quarter improved on lower sales while warning that market conditions in its industry are likely to further deteriorate in 2015. Milwaukee-based mining equipment manufacturer Joy Global reported net income for the quarter ended Oct. 31 of $136.9 million, or $1.38 per share, compared with $26.8 million, or 25 cents per share, for the comparable period a year ago.