摘要:
A security device can be secured to a pedal vehicle to prevent the vehicle being pedalled. The security device includes a receiving means and a securing means. The receiving means may include a through-hole means for receiving part of a frame and a pedal crank arm of the vehicle and may have an open configuration in which the frame part and a part of the crank can be placed in the through-hole means, and a closed configuration in which a frame part and crank arm are held in the through-hole means against relative movement therebetween.
摘要:
A security device can be secured to a pedal vehicle to prevent the vehicle being pedalled. The security device includes a receiving means and a securing means. The receiving means may include a through-hole means for receiving part of a frame and a pedal crank arm of the vehicle and may have an open configuration in which the frame part and a part of the crank can be placed in the through-hole means, and a closed configuration in which a frame part and crank arm are held in the through-hole means against relative movement therebetween.
摘要:
Polymer composite films were prepared by solvent casting suspensions of quantum dots (QDs) in cellulose triacetate (CTA) solution. The films were robust and possessed the optical properties characteristic of QDs. Transmission electron microscopy (TEM) images of the films revealed that the QDs were well dispersed within the CTA film matrix. The selective alkaline hydrolysis of QD/CTA films in 0.1N NaOH over 24 hours resulted in the surface conversion of CTA to regenerated cellulose. Optical properties of the films were probed both before and after the hydrolysis reaction using fluorescence spectroscopy, and were found generally unaltered. The cellulose surfaces of the alkaline treated films allow for facile incorporation of the films into paper sheets.
摘要:
Polymer composite films were prepared by solvent casting suspensions of quantum dots (QDs) in cellulose triacetate (CTA) solution. The films were robust and possessed the optical properties characteristic of QDs. Transmission electron microscopy (TEM) images of the films revealed that the QDs were well dispersed within the CTA film matrix. The selective alkaline hydrolysis of QD/CTA films in 0.1N NaOH over 24 hours resulted in the surface conversion of CTA to regenerated cellulose. Optical properties of the films were probed both before and after the hydrolysis reaction using fluorescence spectroscopy, and were found generally unaltered. The cellulose surfaces of the alkaline treated films allow for facile incorporation of the films into paper sheets.