Abstract: Positive reference spiked in collected sample for use in qualitatively and quantitatively detecting viral RNA.

Abstract: A food processor and an electric motor for a food processor. The electric motor includes: a stator core having a ring-shaped stator yoke and a plurality of stator teeth provided at an inner peripheral face of the stator yoke, two adjacent stator teeth defining a stator slot there between, the plurality of the stator teeth defining a stator hole coaxial with the stator yoke, and an outer contour of a radial section of the stator yoke being substantially circular and having a maximum radial dimension D; and a rotor core rotatably provided in the stator hole and coaxial with the stator hole, the rotor core having a maximum radial dimension d, in which 0.4?d/D?0.55.

Abstract: A lens assembly is separated into a first lens module including at least one lens element and a second lens module including at least one other lens element during alignment of its lens elements. Coarse alignment is conducted by aligning an optical axis of at least one lens element within the first lens module with an optical axis of at least one lens element within the second lens module. For conducting fine alignment, an image sensor views a test chart while the first and second lens modules are positioned between the test chart and the image sensor. Image quality indices are obtained from the image sensor of the test chart at different relative alignments between the first and second lens modules, before the first lens module is fixed to the second lens module at a relative alignment therebetween where the image quality indices are optimized.

Abstract: A lens assembly is separated into a first lens module including at least one lens element and a second lens module including at least one other lens element during alignment of its lens elements. Coarse alignment is conducted by aligning an optical axis of at least one lens element within the first lens module with an optical axis of at least one lens element within the second lens module. For conducting fine alignment, an image sensor views a test chart with while the first and second lens modules are positioned between the test chart and the image sensor. Image quality indices are obtained from the image sensor of the test chart at different relative alignments between the first and second lens modules, before the first lens module is fixed to the second lens module at a relative alignment therebetween where the image quality indices are optimized.