Abstract: A window covering system and a calibration method therefor are provided for generating a safe distance between a middle rail and a lower rail according to status of a first lifting cord. The calibration method includes moving the middle and lower rails upwardly until reaching their initial positions, moving down the lower rail a predetermined distance and storing the detected position thereof as a first position, moving down the middle rail until a switch transmits a first signal as the first lifting cord running through the switch becomes loose, moving up the middle rail until the switch stops transmitting the first signal as the first lifting cord becomes tense, storing the detected position of the middle rail as a second position, and generating the safe distance according to the first and the second positions such that the middle rail is prevented from being pushed by the lower rail.

Abstract: The present disclosure relates, in general terms, to nanoparticles which are characterised by having a photoluminescent amorphous core and a surface is functionalised with at least a carbohydrate. The present disclosure also relates to methods of forming and functionalising the nanoparticles and a photoluminescence assay comprising the nanoparticles for quantifying a sample comprising bacterial cells.

Abstract: An exemplary heat dissipating fan includes a frame and an impeller rotatably received in the frame. The frame includes a base and a top cover disposed on the base, the base includes a bottom plate a peripheral sidewall. The sidewall extends between the bottom plate and the top cover, and the base and the top cover cooperatively defines a receiving space. The impeller is rotatably received in the receiving space. The top cover, the bottom cover and the sidewall cooperatively define an air inlet therebetween. The top cover, the bottom plate and the sidewall cooperatively define an outlet therebetween. The air outlet is generally adjacent to and substantially perpendicular to the air inlet.

Abstract: An exemplary heat dissipating fan includes a frame and an impeller rotatablely received in the frame. The frame includes a base and a top cover disposed on the base, the base includes a bottom plate a peripheral sidewall. The sidewall extends between the bottom plate and the top cover, and the base and the top cover cooperatively defines a receiving space. The impeller is rotatably received in the receiving space. The top cover, the bottom cover and the sidewall cooperatively defines an air inlet therebetween. The top cover, the bottom plate and the sidewall cooperatively defines an outlet therebetween. The air outlet is generally adjacent to and substantially perpendicular to the air inlet.