Abstract: The invention provides an additive for lowering the minimum usable temperature of a biodiesel fuel or a diesel/biodiesel blend. The additive comprises at least one saccharide ester and a polymer having a comb structure. In some instances there is only one saccharide ester present. In this case the saccharide ester comprises at least one saturated ester group and at least one unsaturated ester group. In other instances, there is more than one saccharide ester is present. In these cases the additive comprises a first saccharide ester comprising at least one saturated ester group and a second saccharide ester comprising at least one unsaturated ester group.

Abstract: A method of determining the location of an optical feature in an image projection system, the method comprising: 1) projecting a first image of the feature onto a detector with a lens in a first position; 2) sensing, with the detector, the position of the first image of the feature; 3) projecting a second image of the feature onto a detector with a lens in a second position laterally spaced from the first position; 4) sensing, with the detector, the position of the second image of the feature; and 5) deducing the location of the defect from the difference between the positions sensed in steps 2) and 4).